Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
  • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
  • H01G11/22—Electrodes
  • H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/04—Construction or manufacture in general
  • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/058—Construction or manufacture
  • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/531—Electrode connections inside a battery casing
  • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/531—Electrode connections inside a battery casing
  • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/13—Energy storage using capacitors
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

• the present invention relates to the field of electrochemical metal-ion generators, which operate according to the principle of insertion or deinsertion, or in other words intercalation-deintercalation, of metal ions in at least one electrode.
• a metal-ion 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 housing of elongated shape along a longitudinal axis (X), the housing being arranged to house the electrochemical cell with sealing while being traversed by a portion of the current collectors forming the terminals output, also called poles.
• the separator may consist of one or more films.
• 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 present invention aims to improve the realization of a portion of the electrical connection between at least one electrochemical cell of the battery and its output terminals integrated into its housing.
• the invention applies to any electrochemical metal-ion accumulator, that is to say also sodium-ion, magnesium-ion, aluminum-ion ...
• the invention also applies to the production of an electrochemical bundle of a supercapacitor and the connection to its case.
• a lithium-ion battery or accumulator usually comprises at least one electrochemical cell C consisting of a separator impregnated with an electrolyte component 1 between a positive electrode or cathode 2 and a negative electrode or anode 3, a current collector 4 connected to the cathode 2, a current collector 5 connected to the anode 3 and finally, a package 6 arranged to contain the electrochemical cell with sealing while being traversed by a portion of the current collectors 4, 5, forming the output terminals.
• the architecture of conventional lithium-ion batteries is an architecture that can be described as monopolar, because with a single electrochemical cell comprising an anode, a cathode and an electrolyte.
• monopolar architecture geometry Several types of monopolar architecture geometry are known:
• the electrolyte constituent may be of solid, liquid or gel form.
• the constituent 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 to 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.
• Lithium cation insertion materials which are generally composite, such as lithium iron phosphate LiFePO 4 , lithium cobalt oxide LiCoO 2 , lithiated manganese oxide, optionally substituted, LiMn 2 0 4 or a base of Li
• the negative electrode or anode is very often made of carbon, graphite or Li4Ti0 5 0i2 (titanate material), optionally also silicon-based or lithium-based, or tin-based and their alloys or composite-based silicon.
• This negative electrode as well as the positive electrode may also contain electronic conductive additives as well as polymeric additives which give it mechanical properties and electrochemical performance appropriate to the lithium-ion battery application or its implementation method.
• the anode and the cathode of lithium insertion material may be continuously deposited in a conventional manner in the form of an active layer on a sheet or metal strip constituting a current collector.
• the current collector connected to the positive electrode is usually aluminum.
• the current collector connected to the negative electrode is generally made of copper, nickel-plated copper or aluminum.
• a Li-ion battery or accumulator uses a couple of materials at the anode and at the cathode allowing it to operate at a high voltage level, typically between 3 and 4.1 volts.
• a Li-ion battery or accumulator comprises a rigid package or housing when the targeted applications are binding where a long life is sought, with for example much higher pressures to be withstood and a stricter required sealing level, typically less than 10 "6 mbar.l / s of helium, or in environments with strong constraints such as aeronautics or space.
• the main advantage of rigid packaging is their high seal and maintained over time because the Closure of the housings is performed by welding, generally by laser welding.
• FIG. 1 One of the types of cylindrical rigid case, usually manufactured for a high capacity Li-ion accumulator with a lifetime greater than 10 years, is illustrated in FIG.
• the housing 6 of longitudinal axis X comprises a cylindrical lateral envelope 7, a bottom 8 at one end, a cover 9 at the other end.
• the lid 9 supports the poles or output terminals of the current 40, 50.
• One of the output terminals (poles), for example the positive terminal 40 is soldered to the cover 9 while the other output terminal, for example the negative terminal 50, passes through the cover 9 with interposition of a not shown seal which electrically isolates the negative terminal 50 of the cover.
• FIGS. 4 and 4 show the photographs of an electrochemical bundle F of elongate shape along a longitudinal axis XI and comprising a single electrochemical cell C such that it is usually wound by winding before the housing steps in a connection box. at the output terminals of the accumulator and its impregnation with an electrolyte.
• the cell C consists of an anode 3 and a cathode 4 on either side of a separator (not visible) adapted to be impregnated with the electrolyte.
• a separator not visible
• uncoated strip or “shore” is meant here and in the context of the invention, a lateral portion of a metal sheet, also called strip, forming a current collector, which is not covered with a metal ion insertion material, such as lithium in the case of a Li-ion battery.
• FIGS. 5A and 5B and FIGS. 6A and 6B show in greater detail a positive electrode or cathode 2 and a negative or anode electrode 3 from which a current electro-chemical beam is produced by winding with a separator.
• the cathode 2 consists of a substrate 2S formed of a metal strip which supports in its central portion 22, an active lithium insertion material 21, while its sideband (bank ) Is devoid of active insertion material.
• the anode 3 consists of a substrate 2S formed of a metal strip which supports in its central portion 32, a lithium insertion active material 31, and its side 30 is devoid of active insertion material .
• Each metal strip 2S, 3S is made in one piece, that is to say, geometric and metallurgical characteristics over its entire surface.
• the objective of the battery manufacturers is to increase the autonomy of a cell constituting the accumulator or their ability to operate at high power regimes while improving their lifetime, ie their number of possible cycles, their lightness and the manufacturing costs of these components. Improvement routes for Li-ion accumulators concern, for the most part, the nature of the materials and the methods of elaboration of the electrochemical cell components.
• the patent FR 2094491 discloses an alkaline accumulator whose electrical connection between the wound electrochemical cell and output terminals is obtained by cutting the banks of the electrodes by regularly spaced slots and then radial folding the thus split shores of the outside of the inside under the form of scales superimposed so as to form a substantially plane base on which is finally welded a current collector, constituted if necessary by the housing cover.
• the patent application EP 1102337 discloses a Li-ion accumulator whose electrical connection between the electrochemical cell wound and output terminals is obtained by a single pressing of each end of the electrode strips of the wound cell, along the axis of winding, by means of a pressing mandrel and then, by laser welding of each end of the electrode strips with a terminal current collector consisting of a foil in the form of a disk and a connecting tongue itself. even laser welded subsequently to the housing cover, at one end and at the bottom of the housing, at the other end. Ribs are each made on a diameter of the disc and are themselves pressed beforehand the welding against the ends of pressed electrode strips.
• the patent application EP 1596449 describes a Li-ion accumulator whose electrical connection between the wound electrochemical cell and output terminals is obtained firstly by multiple pressing of each lateral end delimited by the uncoated strips of electrodes of the cell. wound, by means of a pressing mandrel of outside diameter between 15 and 20 mm.
• the pressing mandrel moves in a very short stroke alternately from the outside to the inside of the cell parallel to the winding axis by sweeping the entire side surface of the uncoated electrode strips to entangle between them.
• Patent EP1223592B1 which concerns rather the field of supercapacitors, describes a technique of electrical connection of current collectors to the electrochemical bundle by direct bearing collectors in the form of plate on the banks.
• Patent US6631074B2 which also relates to supercapacitors, describes a solution which consists in projecting an electrically conductive material, such as aluminum, onto the surfaces at each end of the electrochemical bundle, so as to obtain for each end a surface continuity of electrical contact between all the strips at the electrode edges, each surface is then welded by laser welding to the current collector.
• an electrically conductive material such as aluminum
• the mass and the volume of the sidebands not coated with electrodes (banks) necessary for the electrical connection with the current collectors according to the state of the art are not necessarily optimized, which implies in the end a mass and a volume of the accumulator also not yet optimized.
• the inventors found that de facto the banks of the same lateral end were not necessarily electrically connected to each other, in particular the parts of these banks located in the most peripheral zone of the beam. This implies a specific specific capacity of the electrochemical beam decreased, which can be detrimental especially for high power applications for the accumulator.
• the electrolyte filling step in an electrochemical battery of lithium accumulator can be relatively long and delicate because the current collectors according to the state of the art as they are welded on the banks of battery electrochemical bundle constitute a consequent obstacle to the passage of the electrolyte.
• FIG. 7 illustrates such a configuration: the zone Zd1 surrounded shows the more extensive folding of the electrode bank 20 at the heart of the electrochemical beam F.
• the welding operation of a metal part forming a current collector or of different coiled portions of the same strip can produce strong heating that can propagate to the separator which then do, causing short circuits as well.
• FIG. 7A which is a detailed view of FIG. 7, shows a configuration according to which the edge mattress 20 insufficiently dense at the periphery has caused an undesirable localized fusion during the welding of the current collector 13: the zone Zd2 surrounded is a zone of lower density and in which the bank 20 has locally melted.
• FIG. 8 illustrates a zone Zd3 for melting portions of the electrode bank 20 between them.
• the object of the invention is to respond at least in part to this need.
• the invention relates, in one of its aspects, to an electrode for an electrochemical bundle of a metal-ion accumulator or a supercapacitor, comprising a substrate formed of a metal strip which supports in its central portion an active material for metal ion insertion, while its sideband, said bank, is devoid of active insertion material, the sideband comprising an end zone whose properties of its metallic material and / or its geometry are (are) modified relative to the remainder of the strip in the bank and in the central portion, so as to cause localized plastic buckling on the end zone when a predetermined compression force (E) is applied to said end zone, the central portion not deforming under the predetermined compressive force.
• E predetermined compression force
• plastic buckling is meant the usual meaning, that is to say a buckling induced by compression force, with the achievement of an irreversible mechanical deformation.
• the lateral band comprises an intermediate zone, between the central portion and the end zone, whose properties of its metallic material and / or its geometry are chosen so that said intermediate zone does not deform under the predetermined compressive force.
• This intermediate zone increases the safety of embodiment, mechanically protecting the core of the electrochemical bundle comprising the active insertion materials, during the tamping and welding steps of the current collector to the packed end zone.
• the Young's modulus and / or the elastic limit of the zone of end is (are) modified (s) by the application of one or more thermomechanical treatments.
• the strip may also have a metallurgical state gradient between the end zone and the intermediate zone.
• thermomechanical treatments control of quenching speeds, choice of the temperature of an income
• the thickness of the strip in the end zone may be less than that of the remainder of the strip in the bank and in the central portion.
• the intermediate zone may comprise stiffeners uniformly distributed over its length, that is to say on the height of the electrochemical bundle.
• the strip In order to mechanically weaken the strip, it may advantageously be pierced with holes or slots or impressions evenly distributed in the end zone.
• the strip may also advantageously be provided with at least one continuous groove along the length of the end zone.
• the modified geometry of the end zone by structural defects (imprints, continuous groove) or thickness losses (holes, slots) will promote the appearance of the deformation instability of the said zone during tamping. axial beam at this end.
• the width of the end zone, once the compressive force applied, is preferably between 0.5 and 4 mm.
• the strip may have a thickness of between 5 and
• the electrode strip may be of aluminum or copper.
• the invention also relates in another aspect, and according to a first alternative, a method of producing an electrochemical bundle (F) of a metal-ion accumulator (A) such as a Li-ion accumulator, or of a supercapacitor, for its electrical connection to the output terminals of the accumulator, comprising the following steps:
• an electrochemical bundle comprising at least one electrochemical cell (C) consisting of a cathode as described above and an anode as described above, on either side of a separator adapted to be impregnated with an electrolyte, the beam having an elongate shape along a longitudinal axis XI, with at one of its lateral extremities, the lateral band of the anode and at the other of its lateral extremities the lateral band of the cathode;
• the axial tamping being carried out one or more times so as to obtain, on at least one lateral end of the bundle, a packed end zone forming a substantially flat and continuous base, intended to be welded to a current collector.
• an electrochemical bundle comprising at least one electrochemical cell (C) consisting of a cathode and an anode on either side of a separator adapted to be impregnated with an electrolyte, the cathode and the anode each comprising a substrate, formed of a metal strip which supports in its central portion an active metal ion insertion material, while its strip lateral, said bank, is devoid of active material insertion and whose properties of its metallic material and geometry are identical to the rest of the strip in the bank and in the central portion, the beam having an elongated shape along a longitudinal axis XI , with at one of its lateral ends, the lateral band of the anode and at the other of its lateral ends the lateral strip or strips of the cathode;
• the axial swaging being carried out in one or more times so as to obtain, on at least one lateral end of the bundle, a packed end zone forming a substantially planar and continuous base, intended to be welded to a current collector.
• a "/ supply of an electrochemical bundle (F) comprising at least one electrochemical cell (C) consisting of a cathode and an anode on both sides of a separator adapted to be impregnated with an electrolyte, the cathode and the anode each comprising a substrate, formed of a metal strip which supports in its central portion an active metal ion insertion material, while its strip lateral, said bank, is devoid of active material insertion and whose properties of its metallic material and geometry are identical to the rest of the strip in the bank and in the central portion, the beam having an elongate shape along a longitudinal axis XI, with at one of its lateral ends, the lateral band of the anode and at the other of its lateral ends the lateral strip or strips of the cathode;
• the modified end zone relative to the rest of the electrode is during the tamping process.
• the height of the end zone packed on a lateral end is preferably less than 4 mm, preferably between 0.5 and 2.5 mm.
• the electrochemical bundle consists of a single electrochemical cell wound on itself by winding.
• the spacing between the anode strip and the cathode strip, considered in their central portion after winding is preferably between 100 ⁇ 500 ⁇ .
• the invention also relates, in another of its aspects, to a method of producing an electrical connection portion between an electrochemical bundle (F) of a metal-ion accumulator (A) and one of the output terminals of the accumulator, comprising the following steps:
• the invention finally relates to a battery or metal-ion accumulator, such as a lithium (Li-ion) accumulator or a supercapacitor comprising a housing comprising:
• the casing is based on aluminum
• the metal strip of negative electrode (s) is made of copper
• the negative electrode insertion active material (s) is chosen from the group comprising graphite, lithium, titanate oxide Li 4 Ti050i 2; or based on silicon or lithium-based, or tin-based and their alloys;
• the metal strip of positive electrode (s) is made of aluminum
• FIG. 1 is a schematic exploded perspective view showing the various elements of a lithium-ion accumulator
• FIG. 2 is a front view showing a lithium-ion battery with its flexible packaging according to the state of the art
• FIG. 3 is a perspective view of a lithium-ion battery according to the state of the art with its rigid packaging consisting of a housing;
• FIG. 4 is a reproduction of a photographic perspective view of an electrochemical bundle of a lithium-ion battery according to the state of the art, the beam consisting of a single electrochemical cell wound on itself; by winding;
• FIGS. 5A and 5B are respectively side and top views of a positive electrode of the electrochemical bundle according to FIG. 4;
• FIGS. 6A and 6B are respectively side and top views of a negative electrode of the electrochemical bundle according to FIG. 4;
• FIG. 7 is a photographic sectional view of a lateral end of a beam according to the state of the art on which the steps of axial tamping and current collector welding have been carried out, FIG. first fault area;
• Fig. 7A is a detailed photographic view of Fig. 7, showing a second defect area
• FIG. 8 is a photographic sectional view of a lateral end of a beam according to the state of the art on which the steps of axial tamping and current collector welding have been carried out, FIG. third defect area;
• FIGS. 9A and 9B are respectively side and top views of a positive electrode strip according to the invention.
• FIG. 9C shows an alternative embodiment of a positive electrode strip according to the invention
• FIG. 10 is a reproduction of a photographic perspective view of an electrochemical bundle of a lithium-ion battery according to the invention, the bundle consisting of a single electrochemical cell wound on itself by winding;
• FIGS. 11 and 11D to 11D are reproductions of photographic views showing in perspective and in plan view each of the two current collectors welded at one of the lateral ends of a beam produced in accordance with the invention
• FIG. 12 is a photographic sectional view of a lateral end of a bundle according to the invention on which the steps of axial tamping and current collector welding have been carried out;
• FIG. 13 is a photographic sectional view of the other lateral end of a beam according to FIG. 12.
• the terms “height” and “lateral” relating to the electrochemical beam should be considered in vertical configuration with its lateral ends respectively at the top and at the bottom.
• the inventors propose a new electrode embodiment and a new method for producing the electrochemical bundle from this electrode.
• a positive or negative electrode 3 comprises a metal lateral band with an end zone 21 or 31 whose properties of its metal strip material and / or its geometry is (are) modified relative to the remainder of the strip, that is to say in an intermediate zone 23 or 33 of the bank 20 or 30 and in the central portion 22 or 32.
• Intermediate zone 23 or 33 provides mechanical safety protection during tamping as it will not deform.
• the central portion and, if appropriate, an intermediate safety zone in the strip devoid of active insertion material does not deform during tamping.
• FIGS. 9A and 9B show an exemplary embodiment of this end zone 21 on a 2S cathode metal strip 2.
• the strip is of the same thickness over its entire surface.
• the end zone 21 has undergone a heat treatment, such as a differentiated annealing with respect to the intermediate zone 23 and the central portion 22 intended to be coated with the lithium insertion material.
• the end zone 21 may have a coefficient of resistance to fracture Rm less than that of the remainder of the surface (zone 23, central portion 22).
• the end zone 21 may have a metallurgical state, slightly hardened, type 0, H 12, or H22 and H24 for aluminum, while the rest of the surface (zone 23, central portion 22 retains a hardened state, type H14 to H18 for aluminum.
• FIG. 9C shows an alternative embodiment in which the entire metal strip 2S has the same microstructure, and therefore has not undergone any differentiated treatments.
• the end zone 21 is of lesser thickness than the rest of the surface (zone 23, central portion 22).
• This variant according to FIG. 9C makes it possible, during axial tamping, to control the inelastic deformation of the end zone by limiting the alignment disturbances hitherto observed in the intermediate zones 23 or 33 of the beams produced according to the state art.
• the reduction in the thickness of the strip in the end zone 21, for example by a factor of 2 necessitates increasing its height, before deformation, by a factor of the order of 1.5 to 1.7. only in view of this better control of the plastic deformations during the compressive compression phase.
• the beam therefore has an elongated cylindrical shape along a longitudinal axis XI, with at one of its lateral ends an uncoated anode strip 3 with an end zone 31 modified with respect to the intermediate zone 33 and , at the other 11 of its lateral ends, an uncoated cathode strip 2 with an end zone 31 modified with respect to the intermediate zone 33.
• Axial tamping consists of compression by a flat or structured tool bearing surface substantially equal to the surface of each of the lateral ends of the strips 20 or 30.
• the tool and the electrochemical bundle are arranged coaxially during axial swaging.
• Axial tamping is 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 XI of the beam, and until reaching a desired size of beam following XI, or an effort maximum compression whose value is predetermined beforehand.
• the base formed by the packed portion 20T of the cathode (positive banks) is then soldered with a conventional current collector 14 in the form of a solid disk, itself intended for be welded thereafter with the bottom 8 of the battery housing 6 ( Figures 11, 11A, 11B).
• the beam with the collector 13 is introduced into a rigid aluminum container forming only the lateral envelope 7 of the casing 6. Particular attention is paid during this step to the fact that the tongue 130 does not interfere with the 'introduction. To do this, it folds it advantageously upwards.
• the collector 14 is welded with the bottom 8 of the housing 6.
• the collector 13 is welded to a negative pole 50 forming a through of a cover 9 of the housing 6.
• the lid 9 is then welded to the rigid metal container 7.
• a filling step of the housing 6 is carried out with the aid of an electrolyte, through a not shown opening opening which is formed in the cover 9.
• the production of the Li-ion accumulator according to the invention ends with the plugging of the filling opening.
• the housing 6 in the illustrated embodiments that have just been detailed is aluminum, it can also be steel, or nickel-plated steel. In such a variant, a steel or nickel-plated steel case constitutes the negative potential, the crossing 9 then constituting the positive pole.
• the invention is not limited to the examples which have just been described; it is possible in particular to combine with one another characteristics of the illustrated examples within non-illustrated variants.

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• Engineering & Computer Science (AREA)
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• General Chemical & Material Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Secondary Cells (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
• Connection Of Batteries Or Terminals (AREA)
• Battery Electrode And Active Subsutance (AREA)
• Sealing Battery Cases Or Jackets (AREA)
• Cell Electrode Carriers And Collectors (AREA)

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• 2016
  • 2016-06-15 FR FR1655541A patent/FR3052917B1/fr active Active
• 2017
  • 2017-06-08 US US16/310,028 patent/US20190341201A1/en not_active Abandoned
  • 2017-06-08 JP JP2018565703A patent/JP2019523975A/ja active Pending
  • 2017-06-08 EP EP17728218.3A patent/EP3472880A1/de active Pending
  • 2017-06-08 WO PCT/EP2017/063910 patent/WO2017216021A1/fr unknown

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