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
  • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
• • 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
• • 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
  • H01G11/74—Terminals, e.g. extensions of current collectors
  • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
• • 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
  • H01G11/78—Cases; Housings; Encapsulations; Mountings
  • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
  • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
  • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
• • 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
  • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
  • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
  • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
• • 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
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
  • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
• • 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
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
  • H01M50/514—Methods for interconnecting adjacent batteries or cells
  • H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
• • 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
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
  • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
  • H01M50/522—Inorganic material
• • 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 general technical field of electrical energy storage assemblies.
• the invention relates to the field of modules comprising at least two sets of electrical energy storage.
• the term "electrical energy storage assembly” means a capacitor (i.e. a passive system comprising two electrodes and an insulator), or a supercapacitor.
• a system comprising at least two electrodes, an electrolyte and at least one separator
• a battery of the lithium battery type ie a system comprising at least one anode, at least one cathode and an electrolyte solution between the anode and cathode.
• Modules as shown in FIG. 1 are known, comprising a housing 110 in which several electrical energy storage assemblies 120 connected by connection means are arranged.
• the storage assemblies 120 are connected two by two alternatively at their upper and lower ends.
• connection means allowing the electrical connection of two adjacent storage assemblies 120 comprise two covers 130 and a bar 140.
• Each cover 130 is for capping a respective storage assembly 120 so as to be electrically connected thereto.
• Each cover 130 further comprises a connection terminal 131 adapted to come into contact with a through bore of the bar 140, so as to electrically connect two adjacent storage assemblies 120.
• connection of the covers 130 with the connecting bar 140 of two adjacent storage assemblies 120 is carried out either by force-fitting the bar 140 on the connection terminals 131 of the covers 130, or by laser welding, or else, edge to board between the bar 140 and the terminals 131, or both handsets.
• each cover 130 is assembled to the tube surrounding the element by rolling or crimping. To allow such an assembly, each cover 130 comprises on the periphery of its face in contact with the bar 140, a circular edge 132 - said "overflowing" - extending axially outwardly of the cover.
• this peripheral edge protruding 132 on each of the faces of the covers 130 in contact with the bar 140 requires the implementation of one or the other of the solutions below: using a bar 140 having a complex geometry to span over the overflows 132 of the connected lids 130: this solution induces a reduction of the contact surface between the connecting bar 140 and the cover 111 of the housing 110, through or not with an intermediate material. This causes difficulties in managing the cooling of such a module.
• link 140 flat (extending in a main plane) raised relative to the overflow with pins (extending perpendicular to the main plane) and intended to come into contact with the covers: use a flat connecting bar raised above the protrusion of the cover, coming to connect to a terminal 131 higher than the overflowing, but without adding pins, which implies that the tool must maintain in position during the welding operation or that the bar must be force-fitted on the terminal 131 to hold in place during the welding operation.
• An object of the invention is to provide a module for overcoming at least one of the aforementioned drawbacks.
• a module comprising at least two electrical energy storage assemblies, each storage assembly comprising a first face capped by a cover electrically connected to said energy storage assembly and a second face opposite to the first face, each cover being in contact with a respective end of a bar for electrically connecting the two storage assemblies, wherein the bar and the faces of the covers in contact with the bar are flat, the bar being welded on the faces lids along thinning bars (arrangements of the bars provided for the purposes of welding).
• Each cover (30) comprises a connection terminal (31) on its outer face intended to be in electrical contact with one end of the bar (40) at a through bore of the bar (40).
• the two storage assemblies (20) and the welding beads (50, 50 ') are symmetrical with respect to a median plane (A-A') disposed halfway from the axes of revolution of the storage assemblies (20) .
• the weld seams (50, 50 ') of the two storage assemblies (20) are arranged opposite one another.
• the weld seams (50, 50 ') of the two storage assemblies (20) are arranged opposite one another.
• the bar (40) is welded on each side of a cover (30) along at least one weld bead (50, 50 ').
• each energy storage assembly (20) is electrically connected to the bar (40) along at least two solder seams (50, 51 and 50 ', 51').
• the welding beads (50, 51 and 50 ', 51') are symmetrical with respect to a plane (B-B ') passing through the axes of revolution of the energy storage assemblies (20).
• each weld bead (50, 51 and 50 ', 51') is of quarter-circle shape, a first bead (50, 50 ') extending at the periphery of the cover (30) and a second bead weld member (51, 51 ') extending along a median radius of the cover (30).
• the two welding beads (50, 51 and 50 ', 51') are rectilinear and extend parallel to the plane of symmetry (B-B ') passing through the axes of revolution of the two storage assemblies (20).
• the two welding beads (50, 51 and 50 ', 51') are rectilinear and extend perpendicularly to the plane B-B 'of symmetry passing through the axes of revolution of the storage assemblies.
• the two weld seams (50, 51 and 50 ', 51') are rectilinear and form an angle with the plane of symmetry (B-B ') passing through the axes of revolution of the two storage assemblies (20).
• each storage assembly (20) comprises a wound element welded to the cover (30) along at least two welding generatrices (60), the welding beads (50, 51 and 50 ', 51') being arranged so as not to overlap the welding generators (60).
• each storage assembly (20) comprises at least four radially extending welding generatrices (60), each generator (60) forming an angle with respect to the plane of symmetry passing through the axes of revolution of the storage assemblies (20) .
• the radially extending welding generatrices (60) are symmetrical two by two with respect to the plane of symmetry (B-B ') passing through the axes of revolution of the storage assemblies (20).
• the welding generatrices (60) extend along diameters of the covers (30). - The welding generatrices (60) are perpendicular to each other so as to delimit quadrants (61, 62, 63, 64). for each storage assembly (20), the welding beads (50, 51 and 50 ', 51') are arranged in a quadrant (61).
• the other quadrants (62, 63, 64) each comprise at least one other weld bead (52, 53, 54).
• the other welds (52, 53, 54) are in the form of a quarter circle.
• the other welding beads (52, 53, 54) are rectilinear.
• At least two other cords extend perpendicular to the plane passing through the axes of revolution of the storage assemblies.
• one of the other welding beads extends in the plane passing through the axes of revolution of the storage assemblies.
• At least three other cords extend perpendicularly to the plane passing through the axes of revolution of the storage assemblies.
• each bar comprises a superposition of metal strips. - The strips are weldable by resistance.
• each strip is made of aluminum.
• each bar is made of aluminum.
• the bar is laser welded by transparency to the lids.
• the welding of the bar is performed through countersinks.
• the bar is welded to the cover by soldering diffusion on all or part of the contact surfaces between the bar and the covers.
• It comprises heat dissipation elements between the housing cover and the bar and the covers so as to thermally connect while electrically isolating the housing and the energy storage assemblies.
• the elements of heat dissipation between the elements and the wall of the module comprise an elastomer layer.
• FIG. 1 illustrates an embodiment of a module of the prior art
• FIGS. 2, 2a, 2b illustrate a module according to the invention
• FIG. 3 illustrates an embodiment of weld seams
• FIGS. 4a to 4h and 5 illustrate other embodiments of weld seams
• FIG. 6 illustrates another embodiment of the cords and solder points of a module of the bar according to the invention.
• the module 1 comprises a housing 10 in which is disposed at least two electrical energy storage assemblies 20.
• the storage assemblies 20 are of generally cylindrical shape.
• the storage assemblies 20 are arranged side by side in the housing 10. In other words, the axes of revolution of the storage assemblies 20 are parallel. In the embodiment illustrated in Figures 2a and 2b, the storage assemblies 20 are arranged so that their axes of revolution are perpendicular to the bottom wall of the housing 10. In other variants not shown here, the storage assemblies can be of parallelepipedal, square, oval, hexagonal shape, without this changing the general principles of the invention.
• Each storage assembly 20 includes a first face capped by a cover 30 electrically connected to the energy storage assembly 20 along welding generators.
• Each cover may or may not include a connection terminal in the center of its face intended to come into contact with the connecting bar.
• a feature of the module according to the invention is that: i) the connecting strip 40 and the face of each cover 30 intended to come into contact with the strip 40 are flat, and that ii) the strip 40 and the covers 30 are connected by soldering by forming weld seams along the thinness of the bars.
• the term "flat face" of a cover means a generally flat face, which may or may not comprise a connection terminal.
• the term "flat face” of a cover means a cover face whose periphery does not include an edge extending outwardly parallel to the axis of revolution of the assembly. storage.
• Welding by transparency means welding two superimposed parts, by a beam of energy passing through the upper part to be welded or through a thinner part thereof, if the part is thick, or through all its thickness, if the room is thin.
• Transparent welding is opposed to edge-to-edge welding, which consists of welding two pieces positioned edge to edge by a non-traversing energy beam, but adjusted to the shape of the edges to be welded, and positioned precisely to the solder edge interface.
• a flat bar 40 and flat 30 covers also makes it possible to make maximum use of the contact surface between the bar 40 and the cover 30 to produce weld beads whose length and position are chosen. depending on the desired applications and module parameters.
• each end of the connecting bar is welded on one side of a respective cover 30 along a weld bead 50, 50 '.
• Each weld bead 50, 50 ' is of quarter-circle shape along the periphery of the cover 30.
• the welding beads 50, 50 ' are arranged facing one another. This makes it possible to minimize the series resistance of the connection cover / strip / cover.
• the ohmic resistance R of the link bar 40 in the central zone located between two closest welding beads 50, 50 ', each weld bead 50, 50' connecting the bar 40 to a different unit lid 30 is given by:
• S is the section of the bar located between the two weld seams
• p is the electrical resistivity of the bar material.
• connection cover / bar / cover To minimize the ohmic resistance R of the connection cover / bar / cover, it is possible to reduce the distance "d" between the welding beads 50, 50 'to a minimum and / or to maximize the length of the weld beads. Indeed, in the case of a connection by welding, it is estimated that 95% of the current passes through the weld seams 50, 50 'and only 5% by contact parts between them, off-line. It is therefore necessary to find a compromise between the length and the number of welding beads 50, 50 'to be produced, and the number of welding operations to be performed.
• each weld bead and its position at the periphery of the cover make it possible to maximize the length of the weld beads. This facilitates the passage of current (along field lines 60) from one storage unit to another and thus reduces the ohmic resistance of the bar.
• connection cords With reference to FIGS. 4a to 4h and 5, various variants of connection cords have been illustrated.
• Two storage assemblies are arranged symmetrically with respect to a median plane AA 'situated midway between the axes of revolution of the two storage assemblies 20.
• Each cover 30 is electrically connected to a respective end of the bar (not shown) at at least two weld seams 50, 51 and 50 ', 51'.
• main welding beads These welding beads 50, 51 and 50 ', 51' will hereinafter be referred to as "main welding beads", with reference to the fact that the current flow between two storage assemblies is mainly in the zone they delimit. This is related to different parameters such as the position of these main weld seams relative to each other on the cover or the shape of these main weld seams.
• the shape of the main welding beads 50, 51 and 50 ', 51' is variable. According to a variant (illustrated in Figures 4a and 5), the main weld seams 50, 51 and 50 ', 51' are of quarter-circle shape. This maximizes the length of the weld beads.
• the main weld seams 50, 51 and 50 ', 51' are shaped portion of a circle.
• the main welding beads 50, 51 and 50 ', 51' are of rectilinear shape. This facilitates the welding operation of the bar on the covers, a rectilinear weld being easier to achieve than a curved weld.
• the main weld seams 50, 51 and 50 ', 51' of the covers are symmetrical with respect to the median plane A-A '.
• the main welding seams 50, 51 of one of the covers are symmetrical with the main welding seams 50 ', 51' of the other cover relative to the median plane A-A '.
• the main welding beads 50, 51 and 50 ', 51' are symmetrical with respect to a plane BB 'passing through the axes of revolution of the storage assemblies 20. This allows a homogeneous passage of the current between the two storage assemblies 20.
• the main welding beads 50, 51 and 50 ', 51' are arranged opposite each other on their respective covers 30.
• the main welding beads 50, 51 and 50 ', 51' are arranged facing one another. This makes it possible to reduce the ohmic resistance of the bar 40 by minimizing the distance between the main welding beads 50 and 50 ', and 51 and 51'.
• Each cover 30 may or may not include a connection terminal 31 on its outer face intended to be in electrical contact with one end of the bar 40 at a through bore of the bar 40.
• the presence of a connection terminal 31 facilitates the positioning of the bar 40 on the covers 30.
• the absence of connection terminal 31 on the covers 30 reduces the total volume of the module, and therefore increases the power density of the module.
• the position of the main welding beads 50, 51 and 50 ', 51' on the covers 30 may vary.
• quarter-circle welding beads these may be arranged: one at the periphery and the other in a central zone of the lid (FIGS. 4a and 5).
• main welding beads 50, 51 and 50 ', 51' rectilinear they can extend parallel to the plane BB 'passing through the axes of revolution of the two storage assemblies ( Figures 4b, 4g).
• the main weld beads 50, 51 and 50 ', 51' rectilinear may also extend perpendicular to the plane B-B 'extending between the axes of revolution of the storage assemblies 20 ( Figure 4c).
• the main welding beads 50, 51 and 50 ', 51' may also have an angle with the plane BB 'passing through the axes of revolution of the storage assemblies 20 ( Figures 4d to 4f).
• the cover 30 is furthermore welded to the storage assemblies 20 along welding generatrices 60.
• each storage assembly can be welded to a respective lid along two welding generatrices.
• solder generators 60 or more than two solder generators 60.
• each cover 30 is welded to a respective storage assembly 20 along four radially extending welding generatrices 60, each weld generator 60 having an angle to the plane BB 'extending between the axes of revolution of the storage assemblies 20. More particularly, the welding generatrices 60 intended to come opposite the adjacent storage assembly 20 to be electrically connected have an angle ⁇ with the plane BB' plus small as the angle ⁇ between this same plane BB 'and the generators furthest away from the adjacent storage assembly 20 to be connected.
• each lid is welded to a respective storage assembly along two solder generatrices 60 extending along the diameters of the lid 30 so as to delimit portions. circumference of the lid.
• the welding generatrices 60 may be perpendicular to each other (see Figures 4a, 4b, 4d to 4g and 5) so as to delimit quadrants.
• the main welding beads 50, 51 and 50 ', 51' may be arranged so as not to overlap the welding generatrices 60.
• 51 and 50 ', 51' are disposed in one of 61 of the four lid portions 61, 62, 63, 64 defined by the welding generatrices 60, whether these four lid portions 61, 62, 63, 64 are or not equal areas.
• each of the other lid portions 62, 63, 64 may comprise one or more additional weld beads 52, 53, 54. This weld bead will be qualified in the secondary weld bead suite.
• 61, 62, 63, 64 may comprise a secondary weld bead 52, 53, 54 of quarter-circle shape disposed at the periphery of the cover 30.
• each strip 40 is constituted by a superposition of metal strips weldable resistance, for example aluminum.
• the superposition of strips is resistance welded point by point at welding points 41, 42, 43, 44.
• these welding points 41, 42, 43, 44 are not aligned with the weld seams and the welds. welding generators.
• the welding of the bar on the cover can be performed by laser welding by transparency, for example along countersinks arranged on the bar 40.
• An alternative to laser welding by transparency may be soldering-diffusion, for example by Gallium, all or part of the contact surfaces between the bar and the covers.

Landscapes

• Power Engineering (AREA)
• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Inorganic Chemistry (AREA)
• Sealing Battery Cases Or Jackets (AREA)
• Connection Of Batteries Or Terminals (AREA)
• Battery Mounting, Suspending (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
• Secondary Cells (AREA)

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Publications (1)

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Citations (6)

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• 2007
  • 2007-09-13 FR FR0706423A patent/FR2921203B1/fr not_active Expired - Fee Related
• 2008
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• 2010
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