Classifications

• • 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
  • H01M50/148—Lids or covers characterised by their shape
  • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
• • 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
  • H01M50/10—Primary casings; Jackets or wrappings
  • H01M50/147—Lids or covers
• • 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
  • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
• • 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
• • 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
  • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M2220/00—Batteries for particular applications
  • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
• • 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
  • H01M50/172—Arrangements of electric connectors penetrating the casing
  • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
  • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
• • 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
  • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
• • 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
  • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
  • H01M50/51—Connection only in series
• • 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
  • H01M50/531—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
  • H01M50/543—Terminals
  • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
  • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
• • 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
  • H01M50/543—Terminals
  • H01M50/552—Terminals characterised by their shape
  • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
• • 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
  • H01M50/543—Terminals
  • H01M50/564—Terminals characterised by their manufacturing process
  • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
• • 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

Definitions

• the present invention relates to an energy storage device.
• a chargeable and dischargeable energy storage device is used in various equipment such as a mobile phone and an automobile.
• a vehicle which uses electric energy as a power source such as an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV) requires a large energy.
• EV electric vehicle
• PHEV plug-in hybrid electric vehicle
• a large-capacity energy storage module which includes a plurality of energy storage devices is mounted on such a vehicle.
• the energy storage device includes an outer case, and an electrode assembly housed in the outer case and having a plurality of positive electrode plates and a plurality of negative electrode plates stacked by way of separators. Tabs are formed on the positive electrode plates and the negative electrode plates respectively.
• Two external terminals
• Patent document 1 discloses a lithium ion secondary battery having an prismatic case. Through holes are formed in a lid of the case. A rod like barrel portion is inserted into each through hole, a first flange portion is connected to one end portion of the barrel portion in the inside of the case, and a terminal plate (external terminal) is connected to the other end portion of the barrel portion. The tabs of the electrode assembly are connected to the first flange portion.
• Patent Document l JP-A-2016-91659
• the present invention has been made in view of such circumstances, and it is an object of the present invention to provide an energy storage device capable of sufficiently lowering a resistance of a current path.
• An energy storage device includes : an outer case having a lid plate on which an external terminal is mounted; a plate having a tab and housed in the outer case! a conductive shaft portion penetrating the lid plate and having one end thereof connected to the external terminal; and a conductive plate portion housed in the outer case, and having a first surface to which the other end of the conductive shaft portion is connected and a second surface to which the tab is connected, wherein a size of the conductive plate portion and a size of the tab are respectively set larger than a size of the external terminal in a planar direction of the lid plate.
• the size of the conductive plate portion and the size of the tab are respectively larger than the size of the external terminal in the planar direction of the lid plate. Accordingly, compared to a case where the size of the conductive plate portion and the size of the tab are respectively set smaller than the size of the external terminal in the planar direction, a contact area between the tab and the conductive plate portion is increased so that a resistance of a current path can be reduced.
• Fig. 1 is a schematic perspective view of an energy storage device.
• Fig. 2 is a schematic front view of the energy storage device.
• Fig. 3 is a schematic cross- sectional view of the energy storage device taken along line III-III in Fig. 2.
• Fig. 4 is a partially enlarged cross-sectional view of a lid plate and an area in the vicinity of the lid plate taken along line IV- IV in Fig. 2.
• Fig. 5 is a schematic view of an energy storage module having a plurality of energy storage devices.
• Fig. 1 is a schematic perspective view of the energy storage device
• Fig. 2 is a schematic front view of the energy storage device.
• the energy storage device 1 may also be a lithium ion secondary battery.
• the energy storage device 1 includes an outer case 2 having a rectangular parallelepiped shape.
• a stacked electrode assembly 3 described later is accommodated in the outer case 2 together with an electrolyte solution.
• the outer case 2 is formed of a metal case.
• a material for forming the metal case may be aluminum, an aluminum alloy, or stainless steel, for example.
• the outer case 2 has ⁇ a rectangular- shaped bottom wall 7 and a rectangular- shaped ceiling wall 8 which are disposed opposite to each other and have substantially the same size!
• the lid plate 9 extends perpendicular to the bottom wall 7 mounted on a mounting surface (not shown in the drawing) of the energy storage device 1, and the lid plate 9 forms a part of the side surface of the energy storage device 1.
• the lid plate may be disposed at a position of the ceiling wall 8 on a side opposite to the bottom wall 7 of the energy storage device 1.
• a positive electrode external terminal 4 is mounted on one end portion of an outer surface of the lid plate 9 by way of an outer gasket 19, and a negative electrode external terminal 5 is mounted on the other end portion of the outer surface of the lid plate 9 by way of an outer gasket 19.
• the positive electrode external terminal 4 and the negative electrode external terminal 5 expose respective flat outer surfaces, and a conductive member such as a bus bar (not shown in the drawing) is welded to the positive electrode external terminal 4 and the negative electrode external terminal 5.
• a rupture valve 6 is formed on the lid plate 9 between the positive electrode external terminal 4 and the negative electrode external terminal 5.
• Fig. 3 is a schematic cross- sectional view of the energy storage device 1 taken along a line III-III in Fig. 2.
• the stacked electrode assembly 3 includes a plurality of positive electrode plates 12, a plurality of negative electrode plates 13 and a plurality of separators 14.
• the positive electrode plate 12, the negative electrode plate 13 and the separator 14 respectively have a rectangular shape as viewed in a direction which penetrates side walls 11, 11 in Fig. 3.
• the plurality of positive electrode plates 12 and the plurality of negative electrode plates 13 are alternately stacked to each other with the separator 14 sandwiched between the positive electrode plate 12 and the negative electrode plate 13.
• Fig. 1 is a schematic cross- sectional view of the energy storage device 1 taken along a line III-III in Fig. 2.
• the stacked electrode assembly 3 includes a plurality of positive electrode plates 12, a plurality of negative electrode plates 13 and a plurality of separators 14.
• the positive electrode plate 12, the negative electrode plate 13 and the separator 14 respectively have a rectangular shape as
• negative electrode tabs 16 (described later) extending from the respective negative electrode plates 13 are bundled on a distal end side of these negative electrode tabs 16, and the negative electrode tabs 16 are joined to a conductive plate portion 18a.
• the negative electrode tabs 16 are housed in the inside of the outer case 2 in a bent state.
• positive electrode tabs 15 (described later) extending from the positive electrode plates 12 also have substantially the same configuration as the negative electrode tabs 16.
• the positive electrode plate 12 has: a foil-like or a sheet-like positive electrode substrate having conductivity! and a positive active material layer which is stacked on both surfaces of the positive electrode substrate.
• the negative electrode plate 13 has ⁇ a foil-like or a sheet-like negative electrode substrate having conductivity! and a negative active material layer stacked on both surfaces of the negative electrode substrate.
• the separator 14 is made of a sheet-like or a film-like material which allows the infiltration of an electrolyte solution into the separator 14.
• a material for forming the separator 14 a woven fabric, a non-woven fabric, or porous and sheet-like or film-like resin are named, for example.
• the separator 14 makes the positive electrode plate 12 and the negative electrode plate 13 separate from each other and, at the same time, retains an electrolyte solution between the positive electrode plate 12 and the negative electrode plate 13.
• Fig. 4 is a partially enlarged cross-sectional view of the lid plate 9 and an area in the vicinity of the lid plate 9 taken along line IV- IV in Fig. 2.
• Two through holes 9a, 9b are formed in the lid plate 9 in a paced apart manner from each other in a longitudinal direction of the lid plate 9.
• the rupture valve 6 is disposed between two through holes 9a, 9b.
• the rupture valve 6 may be disposed on the rear wall 10 (see Fig. 3) disposed opposite to the lid plate 9.
• an inner gasket 20 having electrically insulating property is disposed on an inner surface of the lid plate 9 at a position in the vicinity of the through hole 9a.
• the inner gasket 20 has a rectangular- plate- shaped gasket body having long sides parallel to a longitudinal direction of the lid plate 9, and the gasket body extends along and in contact with an inner surface of the lid plate 9.
• a through hole is formed in the gasket body of the inner gasket 20, and a cylindrical boss 20b is formed on the gasket body so as to surround the through hole.
• a recessed portion 20a extending in a longitudinal direction of the lid plate 9 is formed on a surface of the gasket body of the inner gasket 20 which opposedly faces the stacked electrode assembly 3.
• the inner gasket 20 has a ring- shaped protruding portion to be compressed on both surfaces of the gasket body on an outer peripheral side of the boss 20b respectively.
• the protruding portion to be compressed is not limited to a ring shape, and a plurality of protruding portions to be compressed may be formed in a spaced apart manner in a peripheral direction of the inner gasket 20.
• the protruding portion to be compressed may be formed only one- side surface (outer surface or inner surface) of the gasket body. Gas tightness of the outer case 2 can be ensured by collapsing the protruding portion to be compressed by pressing.
• An outer gasket 19 having electrically insulating property is disposed in the vicinity of the through hole 9a on the outer surface of the lid plate 9.
• the outer gasket 19 has substantially the same rectangular-plate shape as the inner gasket 20, and a through hole 19a is formed in a center portion of the outer gasket 19.
• a diameter of the through hole 19a is larger than an outer diameter of the boss 20b of the inner gasket 20.
• a recessed portion 19b is formed on one surface of the outer gasket 19.
• the other surface of the outer gasket 19 opposedly faces the outer surface of the lid plate 9.
• the boss portion 20b of the inner gasket 20 is inserted into the through hole 9a formed in the lid plate 9 and the through hole 19a formed in the outer gasket 19.
• a distal end surface of the boss 20b is approximately coplanar with a bottom surface of the recessed portion 19b of the outer gasket 19.
• the positive electrode external terminal 4 has a plate shape, and a through hole 4a is formed in the positive electrode external terminal 4 in the vicinity of a center of the positive electrode external terminal 4.
• a diameter of the through hole 4a is approximately equal to an inner diameter of the boss 20b.
• a counter bore 4b is formed in one surface of the positive electrode external terminal 4 around the through hole 4a.
• the positive electrode external terminal 4 is disposed in the inside of the recessed portion 19b such that the other surface of the positive electrode external terminal 4 and a bottom surface of the recessed portion 19b of the outer gasket 19 opposedly face each other.
• the through hole 4a and the boss 20b are coaxially disposed, and the counter bore 4b is exposed to the outside.
• the positive electrode external terminal 4 and the outer gasket 19 are disposed on the outer surface of the lid plate 9 and the inner gasket 20 and the positive electrode current collector 17 are disposed on the inner surface of the lid plate 9.
• a bus bar or the like to the positive electrode external terminal 4 heat generated by welding is liable to be easily transferred to the outer gasket 19.
• the protruding portion to be compressed which is provided for ensuring gas tightness of the outer case 2 is disposed on the inner gasket 20 as described previously and hence, heat is minimally transferred to the protruding portion to be compressed whereby gas tightness of the outer case 2 by the protruding portion to be compressed can be maintained.
• the positive electrode current collector 17 is mounted on the positive electrode external terminal 4.
• the positive electrode current collector 17 includes : a rectangular- shaped positive electrode conductive plate portion 17a having long sides parallel to the longitudinal direction of the lid plate 9; and a cylindrical positive electrode conductive shaft portion 17b protruding from one surface of the positive electrode conductive plate portion 17a.
• An outer diameter of the positive electrode conductive shaft portion 17b is set smaller than a diameter of the through hole 4a of the positive electrode external terminal 4 and an inner diameter of the boss 20b of the inner gasket 20.
• the positive electrode conductive shaft portion 17b is hollow (hollow rivet), the positive electrode conductive shaft portion may be solid (solid rivet) as an alternative case.
• the other surface of the positive electrode conductive plate portion 17a is formed flat.
• the other surface of the positive electrode conductive plate portion 17a be a flat surface, the presence of a recess is allowed to some extent provided that joining property of the tabs is not lost.
• the positive electrode conductive plate portion 17a and the positive electrode conductive shaft portion 17b are integrally formed with each other. In this embodiment, the positive electrode conductive plate portion 17a and the positive electrode conductive shaft portion 17b are formed as an integral part made of the same material.
• a size of the positive electrode conductive plate portion 17a is larger than a size of the positive electrode external terminal 4 in the longitudinal direction of the lid plate 9, that is, in a planar direction of the lid plate 9.
• one end 17d and the other end 17e of the positive electrode conductive plate portion 17a respectively protrude from one side end 4c and the other side end 4d of the positive electrode external terminal 4 in the planar direction of the lid plate 9.
• the positive electrode conductive shaft portion 17b is inserted into the boss 20b from the recessed portion 20a of the inner gasket 20, and a distal end portion 17c of the positive electrode conductive shaft portion 17b is disposed outside the through hole 4a of the positive electrode external terminal 4 and is swaged (expanded by pressing).
• the swaged distal end portion 17c is disposed in the inside of the counter bore 4b.
• the positive electrode conductive plate portion 17a is disposed in the inside of the recessed portion 20a.
• the plurality of positive electrode plates 12 respectively have the strip-shaped positive electrode tab 15.
• a size of the positive electrode tab 15 is larger than a size of the positive electrode external terminal 4 in the longitudinal direction of the lid plate 9, that is, in the planar direction of the lid plate 9.
• the positive electrode tab 15 is connected to the other surface of the positive electrode conductive plate portion 17a, that is, a surface of the positive electrode conductive plate portion 17a on a side opposite to a surface of the positive electrode
• the positive electrode tab 15 is connected to the positive electrode conductive plate portion 17a ranging from a portion of the positive electrode conductive plate portion 17a protruding from one side end 4c of the positive electrode external terminal 4 to a portion of the positive electrode conductive plate portion 17a protruding from the other side end 4d of the positive electrode external terminal 4.
• the positive electrode tab 15 is connected to at least a portion of the other surface of the positive electrode conductive plate portion 17a which is opposite to the positive electrode conductive shaft portion 17b.
• the inner gasket 20, the outer gasket 19, the negative electrode external terminal 5, and the negative electrode current collector 18 are disposed.
• These inner gasket 20, the outer gasket 19, the negative electrode external terminal 5, and the negative electrode current collector 18 have substantially the same configurations as the previously-mentioned the inner gasket 20, the outer gasket 19, the positive electrode external terminal 4, and the positive electrode current collector 17 disposed in the vicinity of the through hole 9a and hence, the detailed description of these parts is omitted when
• the negative electrode external terminal 5 includes a through hole 5a and a counter bore 5b.
• the negative electrode current collector 18 includes ⁇ a negative electrode conductive plate portion 18a! and a negative electrode conductive shaft portion 18b protruding from one surface of the negative electrode conductive plate portion 18a.
• a distal end portion 18c of the negative electrode conductive shaft portion 18b is swaged.
• a size of the negative electrode conductive plate portion 18a is larger than a size of the negative electrode external terminal 5 in the longitudinal direction of the lid plate 9, that is, in the planar direction of the lid plate 9.
• the plurality of negative electrode plates 13 respectively have the strip-shaped negative electrode tab 16.
• a size of the negative electrode tab 16 is larger than a size of the negative electrode external terminal 5 in the longitudinal direction of the lid plate 9, that is, in the planar direction of the lid plate 9.
• One end 18d and the other end 18e of the negative electrode conductive plate portion 18a respectively protrude from one side end 5c and the other side end 5d of the negative electrode external terminal 5 in the planar direction of the lid plate 9.
• the negative electrode tab 16 is connected to the other surface of the negative electrode conductive plate portion 18a ranging from a portion of the negative electrode conductive plate portion 18a protruding from one side end 5c of the negative electrode external terminal 5 to a portion of the negative electrode conductive plate portion 18a protruding from the other side end 5d of the negative electrode external terminal 5 by ultrasonic welding, laser welding, or swaging, for example.
• the stacked electrode assembly formed by stacking the plurality of positive electrode plates 12 and the plurality of negative electrode plates 13 is used.
• a winding electrode assembly formed by winding one positive electrode plate and one negative electrode plate with a separator interposed therebetween may be used.
• the positive electrode external terminal 4 and the negative electrode external terminal 5 are arranged on the lid plate 9, the positive electrode external terminal 4 and the negative electrode external terminal 5 may be disposed on two surfaces of the outer case 2 respectively.
• respective sizes of the conductive plate portions 17a, 18a and tabs 15, 16 are larger than sizes of the external terminals 4, 5 in the planar direction of the lid plate 9.
• the tabs 15, 16 are connected to at least portions of the conductive plate portions 17a, 18a which are disposed opposite to the conductive shaft portions 17b, 18b. Accordingly, current paths from the tabs 15, 16 to the external terminals 4, 5 become the shortest and hence, resistance values of the current paths can be lowered.
• the conductive plate portion 17a and the conductive shaft portion 17b are integrally formed with each other, and the conductive plate portion 18a and the conductive shaft portion 18b are integrally formed with each other. Accordingly, compared to a case where the conductive plate portion 17a and the conductive shaft portion 17b are formed as separate parts and the conductive plate portion 18a and the conductive shaft portion 18b are formed as separate parts, the resistance values of the current paths can be lowered, and strengths of the current collectors 17, 18 can be increased.
• One ends of the conductive shaft portions 17b, 18b are inserted into the through holes 4a, 5a of the external terminals 4, 5 and are swaged to the external terminals 4, 5.
• the conductive shaft portions 17b, 18b can be mounted on the external terminals 4, 5 simply in a short time by spin swaging.
• the swaged portions do not exist inside the lid plate 9. Accordingly, surfaces of the conductive plate portions 17a, 18a which opposedly face the stacked electrode assembly 3 can be formed into flat surfaces having no unevenness and hence, the tabs 15, 16 can be joined to the flat surfaces easily and with certainty.
• FIG. 5 is a schematic view of an energy storage module 26 having the plurality of energy storage devices 1.
• the energy storage module 26 includes ⁇ a holder 24 formed of a box, end plates and the like! and the plurality of energy storage devices 1 held by the holder 24.
• the plurality of energy storage devices 1 are arranged such that walls (lid plates) on which the external terminals are disposed are directed in the same direction.
• the lid plates of the plurality of energy storage devices 1 are raised from a mounting surface, and the external terminals mounted on these lid plates are directed toward a side of the energy storage module.
• the energy storage devices disposed adjacently to each other are arranged such that a vertical arrangement relationship between the positive electrode external terminal 4 and the negative electrode external terminal 5 is reversed.
• the plurality of energy storage devices 1 can be connected in series.
• the plurality of energy storage devices 1 may be connected to each other in parallel by connecting the same electrodes.
• the conductive plate portions 17a, 18a of the energy storage device 1 are disposed just below the conductive shaft portions 17b, 18b.
• the present invention is applicable to a case where an energy storage module is arranged in a space having a limited height.
• the sizes of the tabs 15, 16 may be set equal to or slightly smaller than the sizes of the external terminals 4, 5 provided that resistances of current paths can be sufficiently suppressed.
• the energy storage device 1 is the lithium ion secondary battery
• the energy storage device 1 is not limited to a lithium ion secondary battery.
• the energy storage device 1 may be one of other secondary batteries such as a nickel hydrogen battery. Further, the energy storage device 1 may be a primary battery or an electrochemical cell such as a capacitor.
• positive electrode conductive plate portion b positive electrode conductive shaft portion: negative electrode current collectora: negative electrode conductive plate portionb: negative electrode conductive shaft portion : energy storage module

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Connection Of Batteries Or Terminals (AREA)
• Electric Double-Layer Capacitors Or The Like (AREA)
• Sealing Battery Cases Or Jackets (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Related Child Applications (2)

Publications (1)

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Cited By (7)

Families Citing this family (11)

Citations (6)

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• 2017
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• 2018
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  • 2018-07-24 DE DE112018003895.5T patent/DE112018003895T5/de active Pending
  • 2018-07-24 CN CN201880047265.3A patent/CN110892546A/zh active Pending
  • 2018-07-24 DE DE202018006886.1U patent/DE202018006886U1/de active Active
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