• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a lithium electrochemical accumulator comprising an electrochemical bundle, a housing arranged to contain in a sealed manner the electrochemical bundle, two current output terminals each connected to one or other of the anode (s). ) and the cathode (s) of the beam, one of the terminals said first terminal passing through a wall of the housing and being electrically insulated from it, according to the invention, the first terminal comprises a first conductive part passing through the housing and having a portion of which at least one area is directly welded to the base.
    公开号:FR3019686A1
    申请号:FR1453088
    申请日:2014-04-08
    公开日:2015-10-09
    发明作者:Frederic Dewulf；Marianne Chami
    申请人:Commissariat a lEnergie Atomique CEA；Commissariat a lEnergie Atomique et aux Energies Alternatives CEA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD The present invention relates to the field of electrochemical generators which operate according to the principle of insertion or deinsertion, or in other words intercalation-deintercalation. , lithium in at least one electrode. The invention particularly relates to lithium-ion (Li-ion) electrochemical accumulators of high capacity, typically greater than 10 father-hours (Ah), and having an ability to pass strong currents, typically greater than 250 A. more particularly relates to a lithium electrochemical accumulator comprising at least one electrochemical cell constituted by an anode and a cathode on either side of a separator impregnated with electrolyte, two current collectors, one of which is connected to the anode and the other at the cathode, and a case of elongated shape along a longitudinal axis, the case é. is arranged to house the electrochemical cell with sealing, and one of whose terminals passes through a wall of the accumulator so as to be electrically connected with the electrode of the electrochemical bundle. The housing may include a lid and a container, usually called a bucket, or have a lid, a bottom, and a side shell assembled at both the bottom and the lid. The object of the invention is to improve the energy density, the mechanical strength and to simplify the production of such an accumulator, while at the same time providing it optimum e ergy and output current. PRIOR ART As illustrated diagrammatically in FIGS. 1A and 1B, a lithium-ion battery or accumulator 1 usually comprises at least one electrochemical cell constituted by a separator impregnated with a fuel oil. t electrolyte between a positive electrode or cathode and a negative electrode or anode, a current collector connected to the cathode, current collector connected to the anode and finally, a package 6 arranged to contain the (the) cell (s) electrochemically sealed while being traversed by a portion of the current collectors 2, 4 forming the two output terminals of the current. The architecture of conventional lithium-ion batteries is an architecture that can be described as monopolar, because with a single electrochemical cell defining t. electrochemical bundle comprising an anode, a cathode and an electrolyte. Several types of monopolar architecture geometry are known: - a cylindrical geometry, with winding around a cylindrical axis as disclosed in US patent application 2006/0121348, - a prismatic geometry, with winding around a prismatic axis as disclosed in US 7348098, US 7338733; a stack geometry as disclosed in US patent applications 2008/060189, US 2008/0057392, and US patent 7335448.
    [0002] The electrolyte constituent may be of solid, liquid or gel form. In the latter form, the composition may comprise a polymer or microporous composite separator impregnated with organic electrolyte (s) or ionic liquid type which allows the displacement of the lithium ion from the cathode to the anode. for a charge and vice versa for a discharge, which generates the current. The electrolyte is generally a mixture of organic solvents, for example carbonates in which is added a lithium salt typically LiPF6. The positive electrode or cathode consists of Lithium chloride insertion materials which are generally composite, such as LiFePO4, LiCoO2, LiNi0.33 Mn033 CO0.3302, deposited on a strip of metal material such as aluminum, called collector current. The negative electrode or anode is very often made of graphite carbon or Li4Ti05012 (titanate material), possibly also based on silicon or silicon-based composite deposited on a strip of metal material, generally copper, copper nickel-plated or aluminum. A lithium-ion battery or accumulator may of course include electrochemical cells which are stacked on top of one another. Traditionally, a Li-ion battery or accumulator uses a couple of materials at the anode and at the cathode allows it to operate at a high voltage level, typically equal to 3.6 volts. A Li-ion battery or accumulator comprises a rigid packaging when the targeted applications are demanding where one seeks a long life, typically greater than 10 years with for example pressures to bear for the housing (vacuum or high overpressure) much higher and more stringent required sealing level, typically less than 10-8 mbar.11s, or in high stress environments such as naval, aeronautical or space. Also, to date rigid packaging consists of a metal housing, typically stainless steel (316L stainless steel or 304 stainless steel), aluminum (Al 1050 or 5 Al 3003) or titanium. Currently, two types of rigid housing, such as the one referenced 6 shown in Figure 1A, are manufactured. The first type consists of a rigid housing consisting of a machined bottom, a side casing and a cover welded together on their periphery by laser. The second type also consists of a rigid box consisting of a stamped cup and a cover welded together on their periphery by laser. As illustrated in FIG. 1B, one of the output terminals 2, generally the negative terminal 2, passes through the housing 6 in an electrically isolated manner and is electrically connected to an electrode of the same polarity of the electrochemical bundle 5 by means of a collector. intermediate current, in the form of a flat tongue 10 folded on itself. The other of the output terminals 4, generally the positive terminal 4, is in turn welded to a wall of the housing 6 itself electrically connected to the electrode of the electrochemical bundle 5 of opposite polarity to that of the terminal 2. The bushing forming the terminal 2 must be perfectly sealed to prevent any leakage of the electrolyte from the housing 6. The patent application FR 2989836 A1, in the name of the applicant, discloses more precisely such a sealed passage of lithium battery case ion. Patent applications FR 2 853 764 and EP 1 653 530 A1 also disclose an i-ion accumulator such as that shown in FIG. 1B, that is to say with a sealed passage of the housing cover forming a terminal and a connection between said negative terminal and the electrochemical bundle by means of an intermediate piece in the form of a flat tongue folded on itself. More specifically, the through terminal is the negative terminal and is welded to one end of the flat tongue whose other end is welded to the uncoated strips of a nickel-plated copper or copper support the anode. This electrical connection solution by means of a tab has drawbacks. First, the tongue folded on itself occupies a height and therefore a volume, not negligible in the housing along the axis of the accumulator. This large volume occupied by the tab decreases the internal volume of the housing can be occupied by the electrochemical beam, which decreases the energy density of the accumulator. In addition, the inventors have carried out heating tests on a tongue 10 as illustrated in FIG. 1B. The results of these tests at different current values are shown as curves in FIG. 1C. It is specified that the temperature measurements were all recorded in the center of a copper tongue whose current section was equal to 7mm2. From these curves, the inventors deduced that such a tab 10 was subject to temperature increases by Joule effect, all the stronger as the value of the current flowing through it is high. Beyond 250-300A, the temperature rise undergone by the tongue appears prohibitive. The consequences of a too high temperature rise of the tongue can be disastrous for the integrity of the accumulator. Thus, melting of the separator at the end of the electrochemical bundle may occur. It can also occur a heating of the electrolyte, the rise in temperature causing an increase in volume with increasing internal pressure of the accumulator.
    [0003] There is therefore a need to improve the electrical connection between the terminal passing through a wall of a lithium battery and its electrochemical beam, in particular in order to increase the density of energy density of a lithium electrochemical accumulator and to limit Joule effect heating p. internal to the case, especially for high current values of the accumulator.
    [0004] DESCRIPTION OF THE INVENTION To this end, the invention relates, in one of its aspects, to a lithium electrochemical accumulator comprising: at least one electrochemical cell constituted by at least one anode and a cathode of part and of another of an electrolyte impregnated in a separator, the cell (s) defining an elongated electrochemical bundle along a longitudinal axis with at one of its lateral ends, uncoated anode strips and at least one other of its lateral ends of the uncoated cathode strips; at least a portion of the uncoated strips of the anode or cathode of the electrochemical bundle being packed into a base; a housing arranged to contain in a sealed manner the electrochemical bundle, - two current output terminals each connected to one or the other of the anode (s) and the cathode (s), a terminals said first terminal passing through a wall of the housing and being electrically insulated therefrom.
    [0005] According to the invention, the first terminal comprises a first conductive part, the first part passing through the housing and comprises a portion of which at least one zone is directly welded to the base. By "uncoated strips" is meant here and in the context of the invention, the portions of the metal sheets, also called strips, forming the current collectors, which are not covered with a lithium insertion material. In the remainder of the text, the term "uncoated strip" or "shore" will be used indifferently to designate an electrode portion as defined above. By "base" is meant the structure obtained by packing the uncoated strips. By "packing" is meant compression along the electrochemical beam axis of at least a portion of the banks so as to produce a structure whose surface is substantially flat, called a base, to receive the direct soldering of the terminal on its surface. . Axial tamping can be performed once or several times. It can consist of a compression according to one or more relative movements back and forth, ie at least one round-trip along the axis of the electrochemical beam, and until reaching a desired dimension of electrochemical beam along the axis, a maximum compression force whose value is predetermined beforehand. The settlement of the portion of the banks can be achieved as described and claimed in the patent application filed in France by the applicant on September 25, 2013 under No. 13 59223. Thanks to the invention, it frees a room intermediate electrical connection between the through terminal and the electrocular beam of an accumulator, such as the tab according to the state of the art. Thus, it eliminates the disadvantages associated with this intermediate piece. First of all, because of the removal of this intermediate piece, one obtains a gain of available volume inside the housing of the accumulator, and therefore, there is increased energy density volume of an accumulator according to the invention compared to those according to the state of the art. Then, the Joule heating of the internal parts of the case is considerably limited, since those that are suffered by the intermediate parts according to the state of the art are eliminated, which is all the more advantageous for high current values of the case. accumulator. Preferably, the second terminal is soldered to the housing. According to an advantageous embodiment, the first terminal comprises a second part C-A (1, female type, the first part being of male type.
    [0006] The accumulator also comprises two electrically insulating seals in the form of washers, each comprising a bearing portion bearing against pressure on one of the faces of the wall of the housing and a guiding portion projecting from the supporting portion, the guide portion being pressed against the edge of the through-hole of the wall. The male piece is tightly fitted in the female part, and each of the conductive parts comprises a bearing portion in surface bearing with pressure against a bearing portion of the washers. According to this embodiment, the female part is also in surface abutment with pressure against the guide portions of the washers. The fact that the male part is tightly fitted in the female part with a pressure support parts and washers against each other provides a perfect seal through the wall crossing forming the home. Preferably, the male and female parts are welded together by continuous weld seam. Such a mode is advantageous because it makes it possible to definitely reinforce the mechanical connection between the male part and the female part. In addition, a continuous weld bead is perfectly sealed and complements and ensures the perfect sealing of the wall penetration, and this throughout the duration of use of a Li-ion battery. In addition to sealing, welding ensures mechanical cohesion with regard to the thermal expansion caused by the heating of the terminal under the effect of strong electric currents.
    [0007] According to an alternative embodiment, the portion of the first part comprises a zone of lesser thickness, and the portion is welded to the base at the location of a zone of lesser thickness, this zone being of a thickness e preferably between 0.1 and 0.8mm, and width 1 preferably between 0.3 and 2mm. According to another variant embodiment, the zone of smaller thickness is an outer peripheral zone 25 of the first part. Alternatively, according to another variant, the zone of lesser thickness is a peripheral groove of annular shape. Preferably, the terminal is soldered to the base by laser transparency. According to a preferred embodiment, the terminals are made of copper or nickel-plated copper. According to an alternative embodiment, the uncoated strips of the same electrode are interconnected by at least one radial weld to the ax beam.
    [0008] According to an advantageous embodiment, the electrochemical bundle is obtained by winding, and the first terminal is soldered on the electrochemical bundle winding axis. According to an alternative embodiment, the electrochemical bundle is obtained by winding, and the terminal is welded halfway between the winding axis of the electrochemical bundle and the outer periphery of the electrochemical bundle. According to an alternative embodiment, the accumulator is of generally cylindrical shape. According to another variant embodiment, the accumulator is of generally prismatic shape. Preferably, the materials and dimensions of the different parts are selected to allow the passage of a current of intensity equal to or greater than 250A. The invention also relates to a method for producing an electrochemical accumulator as described above, according to which the following steps are carried out: a. axial settlement along the axis of the electrochemical bundle (5) of at least one p. strips uncoated with the same electrode of the electrochemical bundle to create the base, b. positioning the first conductive part of the first terminal directly on the base, 20 c. welding the first piece directly to the base. According to an alternative embodiment, the method may further comprise the following steps: d. positioning of two electrically insulating joints in the form of washers on either side of a hole through the wall of the housing, 25 e. positioning the second part of the first terminal through the orifices of the washers and the through orifice of the wall of the housing, f. force fitting of the assembly formed by the wall, the second part and the washers on the first part. boy Wut. crimping the first terminal by surface abutment on the upper surface of the second piece until the alignment of this upper surface with the upper surface of the first through piece; casing and the setting in axial and radial compression of the washers, h. producing a continuous weld bead between the first piece and the second piece. DETAILED DESCRIPTION Other advantages and characteristics of the invention will emerge more clearly from a reading of the detailed description of exemplary embodiments of the invention, given by way of illustration and without limitation with reference to the following figures among which: FIG. 1A is a perspective view of a lithium-ion battery according to the state of the art; FIG. 1B is an axial sectional view of a lithium-ion battery according to the state of the art; FIG. 1C shows the temperature increase curves as a function of the current of a current collector in the form of a tab connecting the terminal through the housing to a polarity of the electrochemical bundle of a lithium-ion accumulator according to FIG. state of the art, - Figure 2A is a close axial sectional view of the terminal through the housing and the electrochemical bundle of a lithium-ion battery according to one embodiment of the invention, - Figure 2B is a view of d 2A, FIG. 3A is a detailed side view example according to the invention of a zone of lesser thickness of the terminal crossing the housing; FIG. 3B is a variant according to the invention of a zone of lesser thickness; the terminal crossing a wall of the housing, - Figure 4A is a top view of the electrochemical beam according to one embodiment of the invention, - Figure 4B is a top view of the electrochemical beam according to an alternative embodiment, the terminal 5 is a side view of an example of an electrochemical accumulator according to the invention; FIGS. 6A and 6B are views in axial section at the level of FIG. a terminal through the battery housing respectively according to the state of the art and according to the invention, illustrating the gain in volume inside the housing, provided by the invention, - Figure 7 is seen in axial section at a terminal crossing the b of an accumulator respectively according to the state of the art and according to the invention, illustrating the path of a high intensity electric current, - Figures 8A to 8C are side views of a lithium-ion battery with a cylindrical housing illustrating different variants of arrangement of a terminal according to the invention through the housing cover and a terminal welded to the housing cover; FIGS. 9A to 9C are similar to FIGS. 8A to 8C but with a box of prismatic shape. Figures 1A, 1B and 1C relate to electrochemical accumulators with a terminal through a wall of the battery according to the state of the art. These figures have already been mentioned in the preamble and will not be mentioned below. Throughout the present application, the terms "lower", "upper", "lower", "high", "below" and "above" are to be understood by reference with respect to a Li-ion battery box. positioned vertically with its lid on the top and the bushing protruding outside the housing upwards. FIGS. 2A and 2B show an example of a current output terminal 2 passing through a wall of the housing 6 of a Li-ion accumulator 1 according to the invention. In the example shown, the terminal 2 passes through the cover 62 of the housing 6 being electrically insulated from it. The terminal 2 can just as much cross another wall of the housing 6, being electrically insulated therefrom. The terminal 2 comprises two conductive parts, a first part, of the male type 21, and a second conductive part, of the female type 22. The male part 21 which extends from the inside of the case 6 is fitted with a tight fit into the female part 22 which extends from the outside of the case 6.
    [0009] The upper surface 23 of the male part 21, external to the housing 6, is in the same plane as the male part and the surface 27 of the female part 22, external to the housing 6. The two conductive parts 21, 22 are isolated from the cover 62 electrically by two washers 31 and 32, of electrical insulating material also having mechanical strength properties adapted to their compression, for example polyetherimide (PEI). The two washers 31, 32 are housed in the through hole of the cover 62, the washer 31 being in abutment against the face of the top of the cover 62 while the washer 32 bears against the underside of the cover 62. More precisely, the male part 21 is in abutment with axial pressure along the longitudinal axis of the terminal 2, against the portion 34 of the washer 32 itself bearing with axial pressure against the cover 62. Similarly, the female part 22 is in abutment with axial pressure against the portion 33 of the washer 31 itself bearing with axial pressure against the cover 62. The guide portions 35, 36 of the washers 31, 32 are in abutment with radial pressure against the edge of the through-orifice of the cover 62. The supports with axial and radial pressure of the washers 31, 32 against the cover 62 guarantee the sealing of the housing 6 at the terminal 2. As shown in FIG. 2B, a weld bead 28 is real between the male piece 21 and the female part 22. The weld bead 28 permanently reinforces the mechanical connection between the end of the male part 21 and the base of the female part 22. In addition, a continuous weld bead is perfectly sealed and complements and ensure perfect sealing of the wall penetration according to the invention, and for the duration of use of a Li-ion battery. In addition to sealing, welding ensures mechanical cohesion with regard to the thermal expansion caused by the heating of terminal 2 under the effect of strong current. The male part 21 has a portion 25 arranged inside the housing 6. This portion 25 has a thinner zone 24 of thickness e and width 1. According to a first variant illustrated in FIG. 3A, this zone 24 is a external peripheral zone of the male part 21. According to a second variant illustrated in FIG. 3B, this zone 24 is a peripheral groove of annular shape. As detailed by ' subsequently, this zone of lesser thickness 24 allows laser welding of the male part 21 directly on the electrochemical bundle 5 according to the invention. The thickness e is preferably between 0.1 and 0.8 mm, and the width 1 is preferably between 0.3 and 1. The electrochemical bundle 5 of the accumulator 1 is wound up and obtained as described and claimed in FIG. patent application filed in France by the applicant on September 25, 2013 under No. 13 59223. As illustrated in FIGS. 4A and 4B, the bundle 5 thus includes shims 53 of the same electrode, a part of which is compressed by forming a base 51. The banks 53 of the same electrode are also welded together by a weld 54, s. s an area where they were previously folded by being deformed plastically in a direction radial to the winding axis of the beam 5. This weld 54 improves the flow of the current. According to the invention, the zone of smaller thickness is welded over its entire periphery directly to the base 51 along at least one weld line 52. This weld 52 is such that the electrical resistance of the connection between the electrochemical bundle 5 and the male part 21 does not exceed 50elums. This weld 52 may be continuous in a single line as shown in Figure 4A, or discontinuous, for example with two circular arcs of angle between 120 and 150 ° as shown in Figure 4B.
    [0010] The terminal 2 may be arranged on the winding axis of the electrocular beam 5 as shown in Figure 4B or between the winding axis of the electrochemical bundle 5 and its periphery as shown in Figure 4A. Thus, according to the invention, the terminal 2 is in direct connection with an electrode of the electrocular beam 5 since welded directly on the base 51.
    [0011] The solution according to the invention with a terminal 2 welded directly to the electrochemical bundle 5 has several advantages in addition to the already described resistivity, which can be enumerated as follows - an abutment in translation of the electrochemical bundle inside. of the housing, which solves the problem usually encountered displacement of the electrochemical beam when the battery is subjected to vibration or mechanical shocks along its longitudinal axis. These mechanical vibrations and shocks are, for example, those of the cycles described by the United Nations Standard for Recommendations on the Transport of Dangerous Goods and more specifically lithium batteries (tests described in the Manual of Tests and Criteria - Section 38.3 entitled "Lithium metal batteries and lithium ion batteries." - - increased mechanical strength of rotation of the through terminal at a large tightening torque, typically greater than 4Nm, compared to the terminals according to the state of the art. This large tightening torque can be experienced, for example, during the assembly of accumulators in a battery module by means of copper strips or busbars - a gain in density of energy density (Wh / l) of a Li-ion accumulator: the terminal 2 soldered directly to the electrochemical bundle 5 f is designed to obtain a gain in volume between the latter and the wall of the case 6 compared to the solenoid electrical connection according to the state of the art. This advantage is illustrated in FIGS. 6A and 6B.
    [0012] As illustrated in FIG. 6A, an electrical connection according to the state of the art, between an electrochemical bundle 5 and a terminal 2 by means of an additional current collector in the form of a tongue 10 folded on itself, implies a height X occupied by the latter with a value between 1 and 5 mm. As illustrated in FIG. 6B, 2.1_ electrical connection by direct soldering of the terminal 2 to the electrochemical bundle 5 according to the invention makes it possible to eliminate the height of the tongue 10, that is to say to have a zero value X as symbolized by the dotted line. The volume gain with the solution according to the invention can thus represent up to 10% gain in energy density s; Li-ion accumulator, depending on its formats. a reduction in the internal heating of the accumulator according to the invention. In fact, the fact of eliminating an additional current collector according to the state of the art, such as the tongue, also makes it possible to limit internal heating to the accumulator which are usually noted during the passage of strong currents, typically greater than 250A. Care is taken to properly size the sections of current passages on the one hand in the solder 52 between the male part 21 and the base 51 of the electrochemical bundle 5 and on the other hand at the interface 28 between the male part and the female part , in order to be able to apply the invention to the power accumulators (charging and discharging regime of 10C to 50C), and of high power (discharge regime> 50C), in order to be able to pass currents of an intensity greater than 500A . The arrow I represents in FIG. 7 the passage of the current through the solder 52 and the interface 28. As represented in FIG. 5, the cover 62 through which the terminal 2 passes forms an integral part of a container with a lateral envelope 61 The casing of the accumulator 6 is sealed completely by a bottom wall 63 attached to the container 61, 62 and welded thereto to the container. The weld between the bottom wall 63 and the lateral envelope 61 of the container may be made by laser welding. The other output terminal 4 of the current of the accumulator, which is not through, is connected both to a wall of the housing 6, such as the cover 62, for example fyi7 welding, and to the banks of the other electrode of the electrochemical bundle 5, not shown. Several types of configuration can be adopted for an accumulator according to the invention for the positioning of the terminals 2 and 4: - terminal 4 supported by the case bottom 6 and 2 through terminal according to the invention supported by the case cover 6 of form cylindrical, with the terminal 2 laterally offset relative to the axis of the housing 6 and the terminal 4 in the X axis of the housing 6 (Figure 8A), or the two terminals 2, 4 in the axis of the housing 6 (Figure 8B), or the two terminals 2, 4 laterally offset from the axis of the housing 6 (Figure 8C); - Terminal 4 supported by the case bottom 6 and 2 through terminal according to the invention supported by the cover 9 of housing 6 of prismatic shape, with the negative terminal 2 laterally offset from the axis of the housing 6 and the terminal 4 in the axis of the housing 6 (Figure 9A), or the two terminals 2, 4 in the axis of the housing (Figure 9B), or the two terminals 2, 4 laterally offset from the axis of the housing (Figure 8C). To produce a Li-ion accumulator according to the invention as represented in FIG. 5, the following steps are performed: a. axial packing along the axis of winding of the electrochemical bundle 5 of at least a portion of the banks 53 of the same electrode to create the base 51, and optionally welded edges together in at least one radial weld 54, b. positioning the male part 21 of the terminal 2 directly on the base 51, according to the position described above and illustrated in FIG. 4A, c. laser welding of the male part 21 directly to the base 51 at the area of smaller thickness 24, to form the weld 52 'd. positioning the two electrically insulating washers 31,32 on either side of a through orifice of the wall 62 of the top of the housing 6, e. positioning the female part 22 through the orifices of the washers 31, 32 and the through orifice of the wall 62, f. force fitting of the assembly constituted by the wall 62, the female part 22 and the washers 31, 32 on the male part 21. g. crimping of the terminal 2 by surface support on the upper surface 27 of the female part 22 until the alignment of this upper surface 27 with the upper surface 23 of the male part 21 and the axial and radial compression of the washers 31, 32, h. producing a continuous weld seam 28 by welding S at the interface 28 between the male part 21 and the female part 22. This welding S may be a laser welding, ultrasound or other welding means. The invention is not limited to the examples I have just been described; it is possible in particular to combine with one another characteristics of the illustrated examples within non-illustrated variants. Other variants and improvements of the invention may be provided without departing from the scope of the invention.
    [0013] Thus, if in the illustrated examples, the through terminal 2 is, preferably with aluminum housing, a negative current output terminal, it can also be a positive terminal. Furthermore, if in the illustrated examples the terminal 2 passes through the cover 62 of the housing 6, it can also pass through any other wall of the housing as the bottom 63. The electrochemical bundle can be compacted over its entire area of banks. It can be provided to have no welding line between banks of the same electrode. Finally, if s. In the illustrated examples, the arrangement of the male part 21 in the female part 22 is such that their ends define a flat surface, that is to say with a difference in height between them substantially zero, it can also be provided a height difference between them which exists but preferably less than 0.3 mm, the male piece is projecting or is retracted relative to the female part. Such an arrangement with a very small difference in height, or zero, on the one hand, to promote the welding of the two male and female parts together and secondly, the subsequent welding of the external connectors to the accumulator .
    权利要求:
    Claims (17)
    [0001]
    REVENDICATIONS1. Lithium electrochemical accumulator (1) comprising: at least one electrochemical cell constituted by at least one anode and a cathode on either side of an electrolyte impregnated in a separator, the cell (s) defining a electrochemical bundle (5) of elongate shape along a longitudinal axis with at one of its lateral ends, uncoated anode strips and at the other of its lateral ends uncoated cathode strips; at least a portion of the uncoated strips of the anode or cathode of the electrochemical bundle (5) being compacted to form a base (51); a housing (6) arranged to contain in leaktight manner the electrochemical bundle; two current output terminals (2,4) each connected to one or the other of the anode (s) and the cathode (s), one of the terminals said first terminal (2) through a wall of the housing (6) and being electrically isolated therefrom, characterized in that the first terminal (2) comprises a first part Conductor (21) passing through the housing (6) and having a portion (25) of which at least one zone (24) is directly welded to the base (51).
    [0002]
    2. electrochemical accumulator according to claim 1, the second terminal (4) being welded to the housing (6).
    [0003]
    3. Electrochemical accumulator according to claim 1 or 2, the first terminal (2) comprises a second conductive part (21,22) of the female type, the first piece (21) is of the male type, the accumulator comprises two electrically insulating seals (31, 32) in the form of washers, each having a bearing portion (33, 34) pressing against one of the faces of the wall (62) of the housing and a portion of guide (35, 36) protruding from the bearing portion, the guide portion being pressed against the edge of the through-orifice of the wall, the male piece (21) being tightly fitted in the piece female (22), each of the conductive parts comprising a bearing portion in surface abutment with pressure against the bearing portion of the washers, the female part being further in surface bearing with pressure against the guide portions of the washers,
    [0004]
    4. Accumulator according to claim 3, the male parts (21) and female (22) being welded together by a continuous weld seam (28).
    [0005]
    5. Accumulator according to one of the preceding claims, the portion (25) being welded to the base (51) by a thinner zone (24) of the first piece (21) of thickness e preferably between 0.1 and 0.8mm, and width 1 preferably between 0.3 and 2
    [0006]
    6. Accumulator according to claim 5, the thinner zone (24) being an outer peripheral zone of the first part (21).
    [0007]
    7. Accumulator according to claim 5, the thinner zone (24) being a ring-shaped peripheral groove.
    [0008]
    8. Accumulator according to one of the preceding claims, the portion (25) 10 being welded to the base (51) by laser transparency.
    [0009]
    9. Accumulator according to one of the preceding claims, the terminals being copper or nickel-plated copper.
    [0010]
    10. Accumulator according to one of the preceding claims, the uncoated strips (53) of the same electrode being interconnected by at least one weld (54) radial to the axis of the beam.
    [0011]
    11. Accumulator according to one of the preceding claims, the electrochemical bundle (5) is obtained by winding, the first 1'orne (2) being welded to the winding axis of the electrochemical bundle (5).
    [0012]
    12. Accumulator according to one of claims 1 to 10, the electrochemical bundle (5) being obtained by winding, the terminal (2) being welded halfway between the winding axis of the electrochemical bundle (5). and 1-, outer periphery electrochemical beam (5).
    [0013]
    13. Accumulator according to one of the preceding claims, the accumulator being of generally cylindrical shape. 25
    [0014]
    14. Accumulator according to one of the preceding claims, the accumulator being of generally prismatic shape.
    [0015]
    15. Accumulator according to one of the preceding claims, the materials and dimensions of the different parts are selected to allow the passage of a current of intensity equal to or greater than 250A. 30
    [0016]
    16. A method of producing an electrochemical accumulator according to one of the preceding claims, wherein the following steps are carried out: a. axial packing along the axis of the electrochemical bundle (5) of at least a portion of the uncoated strips (53) of the same electrode) of the electrochemical bundle (5) to create the base (51), b. positioning the first conductive part (21) of the first terminal (2) directly on the base (51), c. welding the first piece (21) directly to the base (51).
    [0017]
    The method of claim 16, further comprising the steps of: d. positioning two electrically insulating seals (31, 32) in the form of washers on either side of an orifice passing through the wall (62) of the casing (6), e. positioning the second piece (22) of the first terminal through the orifices of the washers (31,32) and the through-orifice of the wall of the case (6), f. force fitting of the assembly constituted by the wall (62), the second piece (22) and the washers (31, 32) on the first piece (21). boy Wut. crimping the first terminal (2) by surface bearing on the upper surface (27) of the second piece (22) until the alignment of this upper surface (27) with the upper surface (23) of the first piece (21) passing through the housing (6) and the axial and radial compression of the washers (31, 32), h. producing a continuous weld seam (28) between the first piece (21) and the second piece (22).
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    FR3019686B1|2016-05-06|
    US10276888B2|2019-04-30|
    US20170117575A1|2017-04-27|
    JP2017510959A|2017-04-13|
    JP6755183B2|2020-09-16|
    WO2015155698A1|2015-10-15|
    EP3130020B1|2021-10-27|
    EP3130020A1|2017-02-15|
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    FR2798227A1|1999-09-02|2001-03-09|Cit Alcatel|Passage for current connection terminal passing through the wall of a sealed electrochemical battery providing good sealing without need to weld to case|
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    FR2989836A1|2012-04-24|2013-10-25|Commissariat Energie Atomique|TRAVERSEE FORMING TERMINAL FOR LITHIUM ELECTROCHEMICAL ACCUMULATOR AND ASSOCIATED ACCUMULATOR.|FR3057108A1|2016-10-04|2018-04-06|Saft|ACCUMULATOR|
    WO2020207679A1|2019-04-11|2020-10-15|Bayerische Motoren Werke Aktiengesellschaft|Method for producing a cover assembly for a cell housing of a prismatic battery cell having a sealing element, and battery cell|FR1359223A|1963-03-11|1964-04-24|Decorative objects and their manufacturing process|
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    FR2853764B1|2003-04-11|2009-06-05|Cit Alcatel|ELECTRICAL CONNECTION OF A CONNECTION TO AN ELECTROCHEMICAL BEAM|
    KR100599714B1|2004-06-25|2006-07-12|삼성에스디아이 주식회사|Secondary battery|
    FR2875056B1|2004-09-07|2007-03-30|Accumulateurs Fixes|ACCUMULATOR HAVING TWO CURRENT OUTPUT TERMINALS ON A WALL OF ITS CONTAINER|
    JP4324794B2|2004-11-09|2009-09-02|ソニー株式会社|Negative electrode active material and secondary battery|
    JP4251204B2|2006-08-31|2009-04-08|日産自動車株式会社|Battery module|
    JP5114036B2|2006-09-08|2013-01-09|Ｎｅｃエナジーデバイス株式会社|Manufacturing method of stacked battery|
    FR3011128B1|2013-09-25|2015-10-30|Commissariat Energie Atomique|METHOD FOR PRODUCING AN ELECTROCHEMICAL BEAM OF A LITHIUM ACCUMULATOR|FR3044659B1|2015-12-07|2020-02-28|Commissariat A L'energie Atomique Et Aux Energies Alternatives|WATERPROOF GLASS-METAL THROUGH, USE AS A TERMINAL FOR LITHIUM ELECTROCHEMICAL ACCUMULATOR, ASSOCIATED PROCESS|
    JP2019029225A|2017-07-31|2019-02-21|リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフトＬｉｔｈｉｕｍ Ｅｎｅｒｇｙ ａｎｄ Ｐｏｗｅｒ ＧｍｂＨ ＆ Ｃｏ． ＫＧ|Power storage element|
    法律状态:
    2015-04-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-04-20| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-28| PLFP| Fee payment|Year of fee payment: 4 |
    2018-05-02| PLFP| Fee payment|Year of fee payment: 5 |
    2019-04-29| PLFP| Fee payment|Year of fee payment: 6 |
    2020-04-30| PLFP| Fee payment|Year of fee payment: 7 |
    2021-04-29| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1453088A|FR3019686B1|2014-04-08|2014-04-08|LITHIUM ELECTROCHEMICAL ACCUMULATOR WITH TERMINAL IN DIRECT CONNECTION WITH THE ELECTROCHEMICAL BEAM, METHODS OF MAKING THE SAME.|FR1453088A| FR3019686B1|2014-04-08|2014-04-08|LITHIUM ELECTROCHEMICAL ACCUMULATOR WITH TERMINAL IN DIRECT CONNECTION WITH THE ELECTROCHEMICAL BEAM, METHODS OF MAKING THE SAME.|
    PCT/IB2015/052532| WO2015155698A1|2014-04-08|2015-04-08|Lithium-ion electrochemical accumulator having a terminal directly connected to the electrode assembly and associated production methods|
    EP15725876.5A| EP3130020B1|2014-04-08|2015-04-08|Lithium-ion electrochemical accumulator having a terminal directly connected to the electrode assembly and associated production methods|
    JP2016561633A| JP6755183B2|2014-04-08|2015-04-08|Lithium electrochemical storage batteries with terminals directly attached to the electrochemical assembly and related manufacturing methods|
    US15/129,478| US10276888B2|2014-04-08|2015-04-08|Lithium electrochemical accumulator having a terminal directly connected to the electrochemical assembly and associated production methods|
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