WO2013157433A1 - 蓄電装置 - Google Patents
蓄電装置 Download PDFInfo
- Publication number
- WO2013157433A1 WO2013157433A1 PCT/JP2013/060643 JP2013060643W WO2013157433A1 WO 2013157433 A1 WO2013157433 A1 WO 2013157433A1 JP 2013060643 W JP2013060643 W JP 2013060643W WO 2013157433 A1 WO2013157433 A1 WO 2013157433A1
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- WIPO (PCT)
- Prior art keywords
- current collecting
- insulating
- positive electrode
- negative electrode
- collecting member
- Prior art date
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- 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
- H01M10/0463—Cells or batteries with horizontal or inclined electrodes
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- 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
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- 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
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- 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
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- 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
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- 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
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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- 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
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- 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 of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- 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 of a single cell or a single battery
- 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
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- 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
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- 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 a power storage device provided with an electrode assembly.
- a strip-shaped separator 83 is interposed between a strip-shaped positive electrode 81 and a strip-shaped negative electrode 82, and these are spirally wound.
- An electrode assembly 84 is provided.
- the positive electrode 81 includes an active material layer 81a to which an active material is applied, and an uncoated portion 81b (current collecting portion) to which the active material is not applied.
- the negative electrode 82 includes an active material layer 82a to which an active material is applied, and an uncoated portion (current collecting portion) on which the active material is not applied.
- illustration of the uncoated part of the negative electrode 82 is omitted.
- the positive electrode 81 and the negative electrode 82 are laminated with the separator 83 interposed therebetween, and the uncoated portion 81 b of the positive electrode 81 and the uncoated portion of the negative electrode 82 are spirally projected in a state of projecting outward from both ends of the separator 83. It is wound in the shape. Then, after the positive electrode 81, the negative electrode 82, and the separator 83 are spirally wound, the flat electrode assembly 84 is formed by compressing the positive electrode 81, the negative electrode 82, and the separator 83 from both radial directions. And the secondary battery 80 is comprised by accommodating the electrode assembly 84 in case 80a into which the electrolyte solution was inject
- a current collection group 81c formed by collecting the uncoated portions 81b of the positive electrode 81 is formed in the electrode assembly 84.
- the current collection group 81 c extends in a direction orthogonal to the stacking direction of the electrode assembly 84.
- a plate-like collector member 85 is connected to a surface of the collector group 81c extending in a direction perpendicular to the stacking direction of the electrode assemblies 84.
- the positive electrode 81 and the current collection member 85 are electrically connected by joining the contact part of the current collection member 85 and the current collection group 81c by ultrasonic welding.
- the electrical connection between the negative electrode 82 and the current collecting member (not shown) is also performed in the same manner as the electrical connection between the positive electrode 81 and the current collecting member 85.
- the current collection group 81c is formed by collecting the uncoated portions 81b of the same length. Therefore, in order to collect all the uncoated parts 81b, each uncoated part 81b has a length that makes it possible to collect both uncoated parts 81b located at both ends in the stacking direction of the electrode assembly 84. It needs to be set at minimum. Furthermore, the surface of the current collection group 81c extending in the direction orthogonal to the stacking direction of the electrode assembly 84 is formed to be able to secure a sufficient contact area with the current collection member 85. There is a need.
- the length of the uncoated portion 81b forming a surface extending in the direction perpendicular to the stacking direction of the electrode assembly 84 in the current collection group 81c has a sufficient contact area with the current collection member 85. It needs to be set to the minimum length that can be secured. Because of this, the length of each uncoated portion 81 b is longer in the direction orthogonal to the stacking direction of the electrode assembly 84. As a result, in the direction orthogonal to the stacking direction of the electrode assembly 84 in the case 80a, the space where the uncoated portion 81b and the current collection group 81c are present is increased, and the performance of the secondary battery 80 is exhibited.
- the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce wasteful space and to isolate a current collection member and a current collection group from a case. To provide.
- An electricity storage device for achieving the above object comprises an electrode assembly formed by alternately stacking a plurality of positive electrodes and negative electrodes with the two being insulated from each other, electricity from at least one of the positive electrode and the negative electrode.
- a current collecting member connected to a current collecting group including a plurality of current collecting portions provided at one end of at least one of the positive electrode and the negative electrode for taking out, the electrode assembly and the current collecting member are accommodated.
- a storage case wherein the current collecting member faces the electrode assembly and is connected to a connection surface connected to the current collection group, and opposite to the connection surface, and An insulating member disposed between the current collecting member and the wall of the case and separating the opposing surface from the wall of the case.
- the current collecting member is disposed such that the connecting surface faces the electrode assembly, a space in which the current collecting group exists in the direction orthogonal to the stacking direction of the electrode assembly in the case Can be less than in the prior art.
- an insulating member is disposed between the current collecting member and the wall of the case. Therefore, even if the connection surface of the current collection member faces the electrode assembly, the current collection member and the current collection group can be insulated from the wall of the case by the insulating member.
- the insulating member may extend from the opposite side of the first insulating portion to the electrode assembly from the first insulating portion interposed between the facing surface and the wall of the case.
- the second insulating portion is provided on both sides of the current collecting member in the stacking direction of the positive electrode and the negative electrode.
- the current collecting member and the current collecting group can be insulated from the wall of the case by the first insulating portion, and the current collecting member and the current collecting group from the case in the stacking direction of the positive electrode and the negative electrode by the second insulating portion It can be isolated.
- the current collecting member includes a positive electrode current collecting member and a negative electrode current collecting member, and the positive electrode current collecting member and the negative electrode current collecting member are provided for the positive electrode terminal and the negative electrode terminal penetrating the wall of the case. It is connected and the said insulation member may have the length which can be contact
- the movement of the positive electrode terminal and the negative electrode terminal is restricted with respect to the case. Since the positive electrode current collection member is connected to the positive electrode terminal and the negative electrode current collection member is connected to the negative electrode terminal, the movement of the positive electrode current collection member and the negative electrode current collection member can be restricted. Furthermore, when the insulating member abuts on the positive electrode terminal and the negative electrode terminal, the movement of the insulating member toward the positive electrode terminal or the negative electrode terminal can be restricted. Therefore, movement of the positive electrode current collecting member, the negative electrode current collecting member, and the insulating member can be restricted, and the assemblability of the electrode assembly and the insulating member to the case can be improved.
- the insulating member may have both ends facing the positive electrode terminal and the negative electrode terminal and formed in a concave arc shape.
- the recessed both ends of the insulating member are engaged with the positive electrode terminal and the negative electrode terminal, the movement of the insulating member toward the positive electrode terminal or the negative electrode terminal can be regulated, and the positive electrode and the negative electrode The movement of the insulating member in the stacking direction can be restricted. Therefore, the assemblability of the electrode assembly and the insulating member to the case can be improved.
- the current collecting member and the insulating member may have a positioning portion for mutually positioning the insulating member and the current collecting member.
- the insulating member and the current collecting member can be positioned by the positioning portion, and the movement of both can be regulated. For this reason, the assemblability of the electrode assembly and the insulating member to the case can be improved.
- the positioning portion is a recess or a protrusion provided on the opposite surface, and an engagement protrusion or an engagement provided on the insulating member so as to be engageable with the recess or the protrusion.
- You may include a recessed part.
- the current collecting member and the insulating member can be positioned only by engaging the recess or the protrusion with the engagement protrusion or the engagement recess, and both can be integrated. .
- the positioning portion may include a hook-shaped locking portion provided on the insulating member so as to be able to be locked to the current collecting member.
- the current collecting member and the insulating member can be positioned, and both can be integrated, only by locking the locking portion to the current collecting member.
- the positioning portion may include the locking portion and a notch formed in the current collecting member such that the locking portion can be locked.
- the movement of the current collection member can be restricted by the contact between the notch and the locking portion.
- the insulating member may have a hook portion hooked to the connection surface.
- the insulating member and the current collecting member can be integrated, and the assemblability of the electrode assembly and the insulating member to the case can be improved.
- the hooking portion is hooked on the connection surface by bending the second insulating portion from the opposite side of the first insulating portion, and the opposite side of the first insulating portion A bending aid portion of the second insulating portion may be provided.
- the second insulating portion is bent to hold the hooking portion on the connection surface. For this reason, it is not necessary to forcibly push the second insulating portion into the current collecting member to deform the second insulating portion in order to hold the hook portion on the connection surface like the U-shaped insulating member, and the second insulating portion Can reduce the stress acting on the And since the bending assistance part is provided, the operation
- the second insulating portion may be in contact with the inner surface of the case outside the respective second insulating portions.
- the bent second insulating portion is prevented from returning to the shape before bending, and a state in which the hooking portion is hooked on the connection surface Can be maintained.
- the current collection group protrudes from one surface of the electrode assembly, and the current collection group has a proximal end and a distal end, and a bent portion between the proximal end and the distal end.
- the current collection group may be curved or bent in the bending portion such that a portion from the bending portion to the tip portion extends in the stacking direction of the positive electrode and the negative electrode.
- the current collection group exists in the direction orthogonal to the stacking direction of the electrode assembly in the case. Space can be reduced.
- the power storage device may be provided with a support member which is provided between the tip of the current collection group and the electrode assembly and can support the tip.
- the connection location between the front end of the current collection group and the connection surface of the current collection member is close to the bending portion, the front edge of the current collection group located closer to the front end than the connection location
- the support member can support the leading end of the current collection group even if the unit is about to fall to the electrode assembly side. Therefore, it is possible to prevent the tip end of the current collection group from falling to the electrode assembly side, and the tip end of the current collection group coming into contact with the case, thereby shorting the current collection group and the case.
- the power storage device may be a secondary battery.
- the present invention it is possible to reduce wasted space which does not contribute at all in exhibiting the performance of the secondary battery, and the power generated as the whole secondary battery as compared with the secondary battery of the prior art. Power density can be improved. Further, since the insulation between the current collecting member and the case is secured by the insulating member, it is possible to suppress the occurrence of a defect in the performance of the secondary battery.
- the useless space can be reduced, and the current collection member and the current collection group can be isolated from the case.
- FIG. 1B is a cross-sectional view of the secondary battery of FIG. 1A taken along line 1B-1B.
- the disassembled perspective view of a secondary battery The perspective view which shows a positive electrode sheet, a negative electrode sheet, and a separator. Sectional drawing which expands and shows the periphery of a current collection group. Sectional drawing which shows the state which bend
- the longitudinal cross-sectional view of the secondary battery in 2nd Embodiment. 8B is a cross-sectional view of the secondary battery of FIG. 8A taken along line 8B-8B.
- the disassembled perspective view of a secondary battery. The perspective view of an insulation member. Sectional drawing along the F11-F11 line
- the fragmentary sectional view of the rechargeable battery in another embodiment. 12B is a cross-sectional view of the secondary battery of FIG. 12A taken along line 12B-12B.
- the perspective view which shows the periphery structure of a positive electrode current collection member and a negative electrode current collection member.
- FIG. 7 is a perspective view showing a U-shaped insulating member.
- the fragmentary sectional view of the rechargeable battery in another embodiment The perspective view which shows the state before making the insulation member in another embodiment into a U-shape.
- FIG. 7 is a perspective view showing a U-shaped insulating member.
- the fragmentary sectional view of the rechargeable battery in another embodiment The perspective view which shows the state before making the insulation member in another embodiment into a U-shape.
- FIG. 7 is a perspective view showing a U-shaped insulating member.
- the fragmentary sectional view of the rechargeable battery in another embodiment The longitudinal cross-sectional view of the secondary battery in another embodiment. Sectional drawing of the secondary battery which shows the insulation member in another embodiment. Sectional drawing of the secondary battery which shows the insulation member in another embodiment. Sectional drawing which expands and shows a part of secondary battery in a prior art example.
- FIGS. 1A to 7 a first embodiment in which the present invention is embodied in a secondary battery mounted on a vehicle (for example, an industrial vehicle or a passenger car) will be described according to FIGS. 1A to 7.
- the secondary battery is used to drive a traveling motor.
- the secondary battery 10 is composed of an electrode assembly 11 and an aluminum case 20 for housing the electrode assembly 11.
- the case 20 has a rectangular box-shaped case main body 21 with a bottom and an insertion portion 21 a into which the electrode assembly 11 can be inserted, and a rectangle for closing the insertion portion 21 a of the case main body 21. It comprises a plate-like lid 22.
- An electrolytic solution is injected into the case 20.
- a positive electrode terminal 23 a and a negative electrode terminal 23 b are provided so as to protrude outward from the terminal wall 23 (the wall of the case 20) which is one of four side walls erected from the peripheral edge of the bottom wall 211. .
- the electrode assembly 11 is a laminated electrode assembly in which a plurality of sheets in which each of the positive electrode sheet 12, the negative electrode sheet 13, and the separator 14 is discontinuous are stacked in a predetermined direction (stacking direction). .
- the positive electrode sheet 12 has an active material layer 12a in which an active material is applied to a metal foil made of aluminum as a base material, and a current collector 12b to which the active material is not applied.
- the current collecting portion 12 b is provided so as to protrude from one end of the rectangular active material layer 12 a in order to extract electricity from the positive electrode sheet 12.
- the negative electrode sheet 13 has an active material layer 13a in which an active material is applied to a copper metal foil as a base material, and a current collector 13b to which the active material is not applied.
- the current collecting portion 13 b is provided so as to protrude from one end of the rectangular active material layer 13 a in order to extract electricity from the negative electrode sheet 13.
- each positive electrode sheet 12 is all in the same rectangular shape, and the respective current collectors 12 b overlap in the stacking direction of the electrode assembly 11.
- each negative electrode sheet 13 is in the same rectangular shape, and the current collectors 13 b overlap in the stacking direction of the electrode assembly 11.
- the current collecting portion 12 b and the current collecting portion 13 b are disposed so as not to overlap each other at one end of the electrode assembly 11.
- All the current collectors 12b are gathered in the stacking direction to form a positive current collection group 12c.
- the current collection group 12 c protrudes from one surface of the electrode assembly 11. Further, a connection surface 193a of a rectangular plate-like positive electrode current collecting member 19a as a current collecting member is connected to one surface of the current collecting group 12c.
- the current collection group 12c and the positive electrode current collection member 19a are joined by ultrasonic welding.
- the current collection unit 12 b is collected while adjusting the curvature of the current collection unit 12 b so that the current collection unit 12 b does not contact the current collection unit 13 b of the negative electrode sheet 13.
- the current collection group 12c has a proximal end and a distal end 121c, and has a bent portion 122c between the proximal end and the distal end 121c. It is done.
- the current collection group 12 c is curved so that the portion from the bent portion 122 c to the tip end portion 121 c extends in the stacking direction, and the positive electrode current collecting member 19 a is extended in the stacking direction of the electrode assembly 11. Therefore, in the positive electrode current collection member 19a, the opposing surface 192a located on the opposite side to the connection surface 193a is opposed to the terminal wall 23.
- a U-shaped insulating member 31 is disposed between the positive electrode current collecting member 19a and the case 20 and between the negative electrode current collecting member 19b and the case 20.
- the insulating member 31 has a rectangular plate-shaped first insulating portion 31a interposed between the facing surface 192a of the positive electrode current collecting member 19a and the facing surface 192b of the negative electrode current collecting member 19b and the terminal wall 23, and the first insulating portion 31a.
- the pair of second insulating portions 31 b and 31 c in the form of a rectangular plate are provided so as to extend from the two long side edges (both long sides) toward the electrode assembly 11.
- the length in the longitudinal direction of the first insulating portion 31a is the length of the protrusion 231a protruding into the case 20 of the positive electrode terminal 23a and the protrusion 231b protruding into the case 20 of the negative electrode terminal 23b. It is shorter than the distance between them.
- the length in the short direction of the first insulating portion 31a is the same as the length between the inner surface of the lid 22 and the inner surface of the bottom wall 211 of the case main body 21 facing the lid 22. It has become.
- the length in the longitudinal direction of the pair of second insulating portions 31b and 31c is from the connection portion between the current collecting group 12c of the positive electrode sheet 12 and the connection surface 193a of the positive electrode current collecting member 19a. It is longer than the length between the current collection group 13c and the connection surface 193b of the negative electrode current collection member 19b, and covers them continuously.
- the length in the standing direction of the pair of second insulating portions 31b and 31c from both long side edges of the first insulating portion 31a is the positive electrode current collector at the tip in the standing direction.
- the length is set to be closer to the electrode assembly 11 than the connection surface 193a of the member 19a or the connection surface 193b of the negative electrode current collector 19b. Therefore, the front end sides of the pair of second insulating portions 31 b and 31 c are disposed between the current collection groups 12 c and 13 c and the case 20.
- the second insulating portions 31 b and 31 c are disposed on both sides of the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b in the stacking direction of the electrode assembly 11.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are insulated from the terminal wall 23 by the first insulating portion 31a.
- one second insulating portion 31 b allows one end portion (first end portion) 194 a and 194 b and current collection groups 12 c and 13 c of the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b in the stacking direction of the electrode assembly 11. , And is isolated from the bottom wall 211 of the case body 21.
- the other second insulating portion 31c allows the other ends (second ends) 195a and 195b of the positive electrode current collector 19a and the negative electrode current collector 19b in the stacking direction of the electrode assembly 11 and the current collectors 12c and 13c. Are isolated from the lid 22 and insulated.
- a concave portion 191a having a circular shape in plan view as a positioning portion is formed on the opposing surface 192a of the positive electrode current collecting member 19a, and on the opposing surface 192b of the negative electrode current collector 19b.
- the concave portion 191b having a circular shape in plan view as the positioning portion is formed.
- the back surface 311a of the first insulating portion 31a which is the surface in contact with the facing surface 192a of the positive electrode current collecting member 19a and the facing surface 192b of the negative electrode current collecting member 19b, has a circular shape in plan view as a positioning portion as shown in FIG.
- the engagement projections 32a and 32b are formed.
- one engaging convex portion 32 a and the concave portion 191 a of the positive electrode current collecting member 19 a are engaged and connected, and the other engaging convex portion 32 b and the negative electrode current collecting member 19 b
- the recess 191 b is engaged and connected.
- the insulating member 31, and the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are positioned, and the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are integrated by the insulating member 31, and the insulating member
- Each positive electrode sheet 12 and each negative electrode sheet 13 are positioned relative to each other by 31.
- hooking portions 33b and 33c are formed so as to protrude from the inner surfaces 311b and 311c which are surfaces facing each other in the pair of second insulating portions 31b and 31c.
- the hooking portions 33b and 33c are formed by the hooking surfaces 331b and 331c and the inclined surfaces 332b and 332c.
- the hooking surfaces 331 b and 331 c extend in a straight line in a direction perpendicular to the inner surfaces 311 b and 311 c of the pair of second insulating portions 31 b and 31 c and approaching each other.
- the inclined surfaces 332b and 332c connect the tips of the hooking surfaces 331b and 331c with the inner surfaces 311b and 311c of the pair of second insulating portions 31b and 31c, and toward the tips of the pair of second insulating portions 31b and 31c. It extends linearly to be inclined. That is, the hooks 33b and 33c have a triangular shape. Each hooking portion 33b, 33c is formed to extend over the entire longitudinal direction of each second insulating portion 31b, 31c.
- the insulating member 31 is from the side of the opposite surface 192a of the positive electrode current collector 19a and the opposite surface 192b of the negative electrode current collector 19b with respect to the positive electrode current collector 19a and the negative electrode current collector 19b.
- the positive electrode current collecting member 19a, the negative electrode current collecting member 19b, and the insulating member 31 are assembled integrally.
- the hooking surfaces 331b and 331c are hooked on the connecting surface 193a of the positive electrode current collecting member 19a and the connecting surface 193b of the negative electrode current collecting member 19b.
- the movement of the insulating member 31 in the direction orthogonal to the stacking direction of the electrode assembly 11 is restricted.
- the insulating member 31 in the direction along the opposing surfaces 192a and 192b by the engagement between the concave portions 191a and 191b of the current collecting members 19a and 19b and the engaging convex portions 32a and 32b of the insulating member 31. Movement is regulated. Therefore, the positive electrode current collection member 19a, the negative electrode current collection member 19b, and the insulating member 31 can be positioned.
- the electrode assembly 11 in which the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b are integrated with the insulating member 31 is accommodated in the case main body 21 via the insertion portion 21 a of the case main body 21.
- the current collecting group 12c of the positive electrode sheet 12 and the positive electrode terminal 23a are electrically connected via the positive electrode current collecting member 19a, and the current collecting group 13c of the negative electrode sheet 13 and the negative electrode terminal 23b are negative current collecting members.
- the secondary battery 10 is configured by being electrically connected via 19 b and closing the insertion portion 21 a of the case body 21 by the lid 22.
- the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b are disposed such that the connecting surfaces 193 a and 193 b of the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b face the electrode assembly 11. For this reason, in the direction orthogonal to the stacking direction of the electrode assembly 11 in the case 20, the space in which the current collection groups 12c and 13c exist is smaller than that in the prior art.
- the insulating member 31 allows the positive electrode current collecting member 19a, the negative electrode current collecting member 19b, and the current collecting member 19b to Power groups 12 c and 13 c are insulated from case 20.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are disposed such that the connection surfaces 193a and 193b face the electrode assembly 11. Therefore, in the direction orthogonal to the stacking direction of the electrode assembly 11, the space in which the current collection groups 12c and 13c exist can be made smaller than in the prior art. As a result, it is possible to reduce the useless space which does not contribute at all in achieving the performance of the secondary battery 10 as compared with the prior art. Therefore, in case 20, the portion contributing to the performance of secondary battery 10 can be increased compared to the prior art, and the output density of the power generated as the whole secondary battery 10 as compared to the prior art secondary battery As a result, the traveling performance of the vehicle using the secondary battery 10 of this embodiment is improved. Further, the insulating member 31 is provided between the positive electrode current collecting member 19a and the negative electrode current collecting member 19b, and the case 20, and insulation is secured even if the current collecting members 19a and 19b are disposed as described above. be able to.
- the positive electrode current collecting member 19a and the positive electrode current collecting member 19a are engaged by the engagement of the concave portions 191a and 191b provided on the opposing surfaces 192a and 192b of the current collecting members 19a and 19b and the engaging convex portions 32a and 32b of the insulating member 31
- the negative electrode current collecting member 19 b and the insulating member 31 can be positioned. Therefore, the movement of the insulating member 31 in the direction along the opposing surfaces 192a and 192b can be restricted.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are insulated by engaging the concave portions 191a and 191b of the current collecting members 19a and 19b with the engagement convex portions 32a and 32b of the insulating member 31. It can be integrated by the member 31. As a result, the positional relationship between the positive electrode current collecting member 19a and the negative electrode current collecting member 19b can be secured by the insulating member 31, and the accuracy of the mutual positional relationship between the positive electrode sheet 12 and the negative electrode sheet 13 can be obtained. It can be easily secured.
- the current collection groups 12c and 13c are bent so that the bent portion 122c and the tip end portion 121c extend along the stacking direction of the electrode assembly 11. Therefore, the current collection group in the direction orthogonal to the stacking direction of the electrode assembly 11 in the case 20 as compared to the case where the entire current collection groups 12 c and 13 c extend in the direction perpendicular to the stacking direction of the electrode assembly 11. The space in which 12c and 13c exist can be reduced.
- FIGS. 8A to 11 a second embodiment in which the present invention is embodied in a secondary battery mounted on a vehicle (for example, an industrial vehicle or a passenger car) will be described according to FIGS. 8A to 11.
- a vehicle for example, an industrial vehicle or a passenger car
- FIGS. 8A to 11 the same components as those of the first embodiment already described are denoted by the same reference numerals, and the overlapping description will be omitted or simplified.
- a U-shaped insulating member 91 is disposed between the positive electrode current collecting member 19a and the case 20, and between the negative electrode current collecting member 19b and the case 20.
- the insulating member 91 has a rectangular plate-shaped first insulating portion 91a extending along the second ends 195a and 195b of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the insulating member 91 is a rectangular plate-shaped second extended from the one long side edge (long side) of the first insulating portion 91a along the facing surfaces 192a and 192b of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b. It has the insulating part 91b.
- the insulating member 91 is a third rectangular plate extending along the connecting surfaces 193a and 193b of the positive current collecting member 19a and the negative current collecting member 19b from the other long side edge (the other long side) of the first insulating portion 91a. It has the insulating part 91c. The insulating member 91 is disposed between the current collection group 12 c of the positive electrode sheet 12 and the current collection group 13 c of the negative electrode sheet 13.
- a first notch 197a having a square shape in plan view as a positioning portion is formed.
- the first notch 197 a is disposed between the current collection group 12 c of the positive electrode sheet 12 and the current collection group 13 c of the negative electrode sheet 13.
- a second cutout 197b having a square shape in plan view as a positioning portion is formed.
- the second notch 197 b is disposed between the current collection group 12 c of the positive electrode sheet 12 and the current collection group 13 c of the negative electrode sheet 13.
- a first notch 197a is formed at the tip of the second insulating portion 91b opposite to the first insulating portion 91a, and at the tip of the third insulating portion 91c opposite to the first insulating portion 91a.
- a hook-shaped first locking portion 92 is formed as a positioning portion which is disposed on the inner side. The pair of first locking portions 92 is disposed to face each other, and protrudes in the direction approaching each other from the second insulating portion 91 b or the third insulating portion 91 c.
- the second insulating portion 91b is disposed at an inner end of the second cutout 197b at the end opposite to the first insulating portion 91a and at the end opposite to the first insulating portion 91a in the third insulating portion 91c.
- a hook-shaped second locking portion 93 is formed as a positioning portion. The pair of second locking portions 93 is disposed to face each other, and protrudes in a direction approaching each other from the second insulating portion 91 b or the third insulating portion 91 c.
- Insulating member 91 is assembled to positive electrode current collecting member 19a and negative electrode current collecting member 19b. Then, the first insulating portion 91a is disposed along the second end 195a of the positive electrode current collecting member 19a and the second end 195b of the negative electrode current collecting member 19b.
- the second insulating portion 91b is disposed along the opposing surface 192a of the positive electrode current collecting member 19a and the opposing surface 192b of the negative electrode current collecting member 19b, and the third insulating portion 91c is formed of the positive electrode current collector 19a. It is arrange
- the insulating member 91 is not assembled to the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the electrode assembly 11 is moved to the case main body 21 or housed in the case main body 21, the mutual positional relationship between the positive electrode current collecting member 19a and the negative electrode current collecting member 19b is secured. Since there is not, the positional relationship between the positive electrode sheet 12 and the negative electrode sheet 13 may be deviated.
- the insulating member 91 is assembled to the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the movement of the current collecting members 19a and 19b in the stacking direction of the electrode assembly 11 and in the direction along the end portions 194a and 195a is restricted by the contact (locking) with the two notches 197b.
- the insulating member 91 ensures the mutual positional relationship between the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the mutual positional relationship between the positive electrode current collecting member 19a and the negative electrode current collecting member 19b is secured, and the positive electrode sheet It is suppressed that a shift
- the first engaging portion 92 is engaged with the first notch 197a, and the second engaging portion 93 is engaged with the second notch 197b. Can be connected via the insulating member 91.
- the first locking portion 92 is disposed inside the first notch 197a
- the second locking portion 93 is disposed inside the second notch 197b. Therefore, by the contact of the first notch 197a with the first locking portion 92 and the contact of the second notch 197b with the second locking portion 93, both end portions 194a of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b, The movement in the direction along 195 a can be restricted, and the mutual positional relationship between the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b can be further secured.
- a first notch 197a having a square shape in plan view as a positioning portion is formed, and both ends of the negative electrode current collector 19b.
- a second cutout 197b having a square shape in plan view as a positioning portion is formed.
- an insulating member 95 is disposed between the positive electrode current collecting member 19 a and the case 20 and between the negative electrode current collecting member 19 b and the case 20.
- the insulating member 95 has a rectangular plate-like main portion 95 a that insulates between the opposing surfaces 192 a and 192 b of the current collecting members 19 a and 19 b and the terminal wall 23.
- a first locking portion as a positioning portion which is erected from the both long side edges (both long sides) of the main body portion 95a toward the electrode assembly 11 and is engaged with the first notches 197a in the main body portion 95a 95b is provided.
- the tip of the first locking portion 95b is in the shape of a hook and is locked to the connection surface 193a of the positive electrode current collecting member 19a.
- a second engagement portion as a positioning portion which is erected from the both long side edges (both long sides) of the main body portion 95a toward the electrode assembly 11 and engaged with the second notches 197b.
- a stop 95c is provided.
- the tip of the second locking portion 95c has a hook shape and is locked to the connection surface 193b of the negative electrode current collecting member 19b.
- the insulating member 95 is a positive current collecting member such that each first locking portion 95b locks to each first notch 197a, and each second locking portion 95c locks to each second notch 197b.
- 19a and the negative electrode current collecting member 19b are assembled.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are sandwiched between the main body 95a and the tip of each first locking portion 95b and the tip of each second locking portion 95c.
- the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b can be stacked in the stacking direction of the electrode assembly 11 and both ends.
- the movement in the direction along the portions 194a and 195a is restricted.
- the movement of the positive electrode current collecting member 19 a and the negative electrode current collecting member 19 b in the direction orthogonal to the stacking direction of the electrode assembly 11 is restricted.
- the first notch 197a and the second notch 197b are omitted, and the second end 195a of the positive electrode current collector 19a is semicircular in plan view.
- the first notch 198a may be formed, and a second notch 198b having a semicircular shape in plan view may be formed at the second end 195b of the negative electrode current collecting member 19b.
- the first notch 198a and the second notch 198b penetrate in the thickness direction of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the first locking portion 96a and the second locking portion 96b have a semi-cylindrical shape extending across and straddling between the second insulating portion 91b and the third insulating portion 91c.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b may be positioned and integrated by the insulating member 91.
- Each of the first locking portions 92 described in the second embodiment is locked to the first end 194 a of the positive electrode current collecting member 19 a in the embodiment shown in FIGS. 13A and 13B. Further, each of the second locking portions 93 described in the second embodiment is locked to one end 194 b of the negative electrode current collecting member 19 b in the embodiment shown in FIGS. 13A and 13B.
- the first notch 197a and the second notch 197b are omitted, and the second end 195a of the positive electrode current collector 19a and the second end of the negative electrode current collector 19b.
- Recesses 199a and 199b as positioning portions may be formed in the portion 195b.
- engaging convex portions 97a and 97b as positioning portions capable of engaging with the concave portions 199a and 199b are provided.
- each of the first locking portions 92 described in the second embodiment is locked to the first end 194 a of the positive electrode current collecting member 19 a in the embodiment shown in FIG. 14. Further, each second locking portion 93 described in the second embodiment is locked to the first end 194 b of the negative electrode current collecting member 19 b in the embodiment shown in FIG. 14.
- a plate-like support member 70 capable of supporting the end portion 121c side of the current collection group 12c is disposed between the current collection group 12c and the electrode assembly 11. It may be set.
- the support member 70 is joined to the electrode assembly 11 side of the bending portion 122 c in the current collection group 12 c.
- the support member 70 linearly extends from the bent portion 122 c of the current collection group 12 c to the second insulating portion 31 b of the insulating member 31.
- the connection between the current collection group 12c and the support member 70 is performed by welding the current collection group 12c at a position close to the bent portion 122c.
- the connection between the current collection group 12c and the support member 70 is also performed.
- the front end side of the current collection group 12c is located between the positive electrode current collection member 19a and the support member 70, and the front end side of the current collection group 12c can be supported by the support member 70. Therefore, it can prevent that the front end side of current collection group 12c contacts case 20, and current collection group 12c and case 20 will be short-circuited.
- the support member 70 may be held by the holding portion 71 formed on the insulating member 31.
- the holding portion 71 is formed to protrude from the inner surface 311 b of the second insulating portion 31 b of the insulating member 31.
- the upper surface 71a of the holding portion 71 facing the first insulating portion 31a of the insulating member 31 has a flat surface shape, and serves as a mounting surface on which the support member 70 is mounted.
- FIG.15 and FIG.16 demonstrated regarding the current collection group 12c of the positive electrode sheet 12, since it is the same regarding the current collection group 13c of the negative electrode sheet 13, the detailed description is abbreviate
- the insulating member 31 is U-shaped by bending the second insulating portions 31b and 31c toward the electrode assembly 11 from both long side edges (both long sides) of the first insulating portion 31a. It may be a type.
- the insulating member 31 has a rectangular shape before bending the second insulating portions 31b and 31c.
- the second insulating portions 31b and 31c extend from both long side edges of the first insulating portion 31a, and are thinner than the first insulating portion 31a, and have thin portions 312b and 312c as bending assistants, and the thin portions It has L-shaped hooking parts 313b and 313c provided on the tip side of 312b and 312c.
- Each hooking portion 313b, 313c has hooking surfaces 331b, 331c facing the back surface 311a of the first insulating portion 31a in a state where the second insulating portions 31b, 31c are bent from the thin portions 312b, 312c.
- the insulating member 31 bends the second insulating portions 31b and 31c from the thin portions 312b and 312c to connect the hooking surfaces 331b and 331c to the connecting surface 193a of the positive electrode current collecting member 19a and the negative electrode.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are integrated by being hooked to the connection surface 193b of the current collecting member 19b.
- the outer surface of one second insulating portion 31b is The outer surface of the other second insulating portion 31 c is in contact with the inner surface of the lid 22 which is the inner surface of the case 20.
- the insulating member 31 may be provided with a cut K having a triangular cross-sectional shape as a bending assisting portion instead of the thin portions 312b and 312c.
- the insulating member 31 bends the second insulating portions 31b and 31c until the opposing inner surfaces of the cuts K abut each other, and the hooking portions 313b and 313c are
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are integrated with each other by being hooked on the connection surfaces 193a and 193b of the current collecting members 19a and 19b.
- the outer surface of one second insulating portion 31b is The outer surface of the other second insulating portion 31 c is in contact with the inner surface of the lid 22 which is the inner surface of the case 20.
- the insulating member 31 bends the second insulating portions 31b and 31c from the thin portions 312b and 312c or the cuts K to cause the hooking portions 313b and 313c to hook on the connection surfaces 193a and 193b. Therefore, there is no need to forcibly push and deform the second insulating portions 31b and 31c into the current collecting members 19a and 19b in order to hold the hooking portions 313b and 313c on the connection surfaces 193a and 193b. The stress acting on the second insulating portions 31 b and 31 c can be reduced.
- the bottom wall 211 and the lid 22 facing the outside of the second insulating portions 31b and 31c prevent the bent second insulating portions 31b and 31c from being restored to the original shape. For this reason, it is possible to maintain the state in which the hooking portions 313b and 313c are hooked on the connection surfaces 193a and 193b of the current collecting members 19a and 19b.
- the second insulating portions 31 b and 31 c can be easily bent by the thin portions 312 b and 312 c or the cut K.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b have plate-like terminal connection portions 24a and 24b to which the positive electrode terminal 23a and the negative electrode terminal 23b are connected.
- the positive current collecting member 19a and the negative current collecting member 19b have rising portions 25a and 25b rising from the terminal connection portions 24a and 24b, and also have current collecting portion connection portions extending in a plate shape from the rising portions 25a and 25b. 26a and 26b and has a crank shape.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are disposed at positions closer to the terminal wall 23 than the terminal connection portions 24a and 24b, and the current collecting portion connecting portions 26a and 26b are disposed.
- the current collectors 12b and 13b are connected to the connection parts 26a and 26b.
- the length in the longitudinal direction of the first insulating portion 31 a is located in the protruding portion 231 a protruding into the case 20 in the positive electrode terminal 23 a and in the case 20 in the negative electrode terminal 23 b It is a length that can abut on the protrusion 231 b.
- the positive electrode terminal 23a and the negative electrode terminal 23b penetrate the terminal wall 23, so that the movement of the positive electrode terminal 23a and the negative electrode terminal 23b is restricted with respect to the terminal wall 23. Further, the positive electrode current collecting member 19a is connected to the positive electrode terminal 23a, and the negative electrode current collecting member 19b is connected to the negative electrode terminal 23b. Therefore, the movement of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b is restricted.
- the insulating member 31 is in contact with the protruding portion 231a of the positive electrode terminal 23a, and the other end of the insulating member 31 is in contact with the protruding portion 231b of the negative electrode terminal 23b. Therefore, movement of the insulating member 31 toward the positive electrode terminal 23 a or the negative electrode terminal 23 b can be restricted in the longitudinal direction of the insulating member 31, and the assemblability of the electrode assembly 11 and the insulating member 31 to the case 20 is improved. be able to.
- the insulating member 31 may be provided with terminal locking portions 31d at both ends in the direction in which both long sides extend, and each terminal locking portion 31d is formed in a concave arc shape There is. And one terminal locking portion 31d is locked to the protruding portion 231a of the positive electrode terminal 23a, and the other terminal locking portion 31d is locked to the protruding portion 231b of the negative electrode terminal 23b.
- the insulating member 31 may be provided with the latching
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b are provided with concave portions 191a and 191b as positioning portions at the current collecting portion connecting portions 26a and 26b, and the insulating member 31 is engaged with the concave portions 191a and 191b. You may provide convex part 32a, 32b.
- the second insulating portions 31 b and 31 c may be bent from the thin portions 312 b and 312 c or the notch K as bending auxiliary portions.
- the pair of second insulating portions 31b and 31c in the insulating member 31 is extended to between the electrode assembly 11 and the case 20, and the electrode assembly is formed by the pair of second insulating portions 31b and 31c.
- the insulation between the case 11 and the case 20 may be secured.
- the bent portion may be formed by bending the current collection groups 12c and 13c.
- each current collection group 12c, 13c may not be bent.
- each current collection group 12c, 13c may extend along a direction orthogonal to the stacking direction of the electrode assembly 11, and the tip thereof may be connected to the positive electrode current collecting member 19a or the negative electrode current collecting member 19b. .
- an insulating member may be separately disposed on the current collecting group 12 c side of the positive electrode sheet 12 and the current collecting group 13 c side of the negative electrode sheet 13.
- the insulating member may be disposed only on the side of the current collection group 12c of the positive electrode sheet 12 and may be positioned by the positioning unit.
- the insulating member may be disposed only on the current collection group 13c side of the negative electrode sheet 13 and may be positioned by the positioning unit.
- the hooks 33b and 33c of the insulating member 31 may be omitted.
- the concave portions 191a and 191b and the engagement convex portions 32a and 32b are circular in plan view, but the present invention is not limited thereto.
- the concave portions and the engagement convex portions have a square shape or triangular shape in plan view. It may be in the shape of a letter.
- the positive electrode current collecting member 19a and the negative electrode current collecting member 19b rotate with respect to the insulating member 31 in the state where the concave portion and the engaging convex portion are engaged when the shape is square or triangular in plan view. Can be regulated.
- a convex portion is formed on the positive electrode current collecting member 19a and the negative electrode current collecting member 19b, and an engagement concave portion which can be engaged with the convex portion is formed on the insulating member 31. It is also good.
- the recess 191a of the positive electrode current collector 19a may penetrate in the thickness direction of the positive electrode current collector 19a.
- the recess 191 b of the negative electrode current collecting member 19 b may penetrate in the thickness direction of the negative electrode current collecting member 19 b.
- the concave portions 191a and 191b of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b may be omitted, and the engaging convex portions 32a and 32b of the insulating member 31 may be omitted.
- the hooks 33b and 33c are formed in a triangular shape, but the present invention is not limited to this.
- the hooks 33b and 33c may be in a square shape, and the shape of the hooks 33b and 33c is particularly limited. It is not a thing.
- the hooking portions 33b and 33c are formed to extend over the entire longitudinal direction of the second insulating portions 31b and 31c, but the present invention is not limited to this. You may form in the part of the longitudinal direction of the parts 31b and 31c.
- the length of the first insulating portion 31a in the longitudinal direction is a protrusion 231a protruding into the case 20 of the positive electrode terminal 23a and a protrusion 231b protruding into the case 20 of the negative electrode terminal 23b. It was shorter than the distance between, but not limited to this.
- the length in the longitudinal direction of the first insulating portion 31a may be a length capable of covering all of the facing surfaces 192a and 192b of the positive electrode current collecting member 19a and the negative electrode current collecting member 19b.
- the current collection group 12c of the positive electrode sheet 12 and the current collection group 13c of the negative electrode sheet 13 may protrude to the opposite side. In this case, it is necessary to separately arrange insulating members on the current collecting group 12 c side of the positive electrode sheet 12 and the current collecting group 13 c side of the negative electrode sheet 13.
- the current collecting portion may be provided so as to protrude from only the positive electrode sheet 12 or the negative electrode sheet 13.
- the present invention is not limited thereto. For example, even if a plate-like positive electrode and a negative electrode having a predetermined amount of thickness are used Good.
- the laminated electrode assembly 11 is used, in which the separator 14 is interposed between the positive electrode sheet 12 and the negative electrode sheet 13 and a plurality of these are laminated in a predetermined direction.
- a strip-shaped separator is interposed between a strip-shaped positive electrode and a negative electrode, and a wound-type electrode assembly configured by spirally winding them around a winding axis is used. It is also good.
- a wound-type electrode assembly is an electrode assembly in which a positive electrode, a negative electrode, and a separator are continuously wound in layers.
- the present invention is embodied in a vehicle secondary battery 10
- the present invention is not limited to this, and may be embodied in a vehicle secondary battery.
- the present invention is embodied in the secondary battery 10.
- the present invention is not limited to this, and may be embodied in a storage device such as an electric double layer capacitor.
- a recess or a protrusion is provided on at least one of the end portions forming the opposite side of the current collecting member, and the insulating member is engaged with the recess or the protrusion.
- a power storage device provided with a joint convex portion or an engagement concave portion.
- An electrode assembly in which a plurality of positive electrodes and negative electrodes are alternately stacked in a state in which the two are insulated from each other;
- a current collection member connected to a current collection group including a plurality of current collection units provided at one end of at least one of the positive electrode and the negative electrode in order to extract electricity from at least one of the positive electrode and the negative electrode;
- a power storage device provided in a case, wherein the current collection group of the positive electrode and the current collection group of the negative electrode extend in the same direction, and the current collection member is composed of a positive current collection member and a negative current collection member
- An electric storage device comprising an insulating member for integrating the positive electrode current collecting member and the negative electrode current collecting member.
- K a notch as a bending auxiliary portion
- 10 a secondary battery as a storage device
- 11 an electrode assembly
- 12 a positive electrode sheet as a positive electrode, 12b, 13b, a current collector, 12c, 13c, a current collection group, 121c ... tip end portion 122c ... bent portion 13 ... negative electrode sheet as a negative electrode
- 19b ... negative electrode current collecting member as a current collecting member
- Recesses as parts, 192a, 192b ... facing surfaces, 193a, 193b ... connecting surfaces, 20 ... cases, 23 ...
- terminal walls as walls, 23a ... positive electrode terminal, 23b ... negative electrode terminal 31, 31, 91, 95 ... insulating member, 31a: first insulating portion, 31b, 31c, second insulating portion, 32a, 32b, 97a, 97b: engagement projection as a positioning portion, 33b, 33c, 313b, 313 ... locking portion 70 ... supporting member, 92, 95b, 96a ... first locking portion as a positioning portion, 93, 95c, 96b ... second locking portion as a positioning portion, 197a, 198a ... as a positioning portion First notch, 197b, 198b ... second notch as a positioning portion, 312b, 312c ... thin-walled portion as a bending auxiliary portion.
Abstract
Description
以下、本発明を車両(例えば産業車両や乗用車両)に搭載される二次電池に具体化した第1の実施形態を図1A~図7にしたがって説明する。なお、二次電池は、走行モータを駆動するために用いられる。
以下、本発明を車両(例えば産業車両や乗用車両)に搭載される二次電池に具体化した第2の実施形態を図8A~図11にしたがって説明する。なお、以下に説明する実施形態では、既に説明した第1の実施形態と同一構成について同一符号を付すなどして、その重複する説明を省略又は簡略する。
前記正極及び前記負極の少なくとも一方から電気を取り出すために、前記正極及び前記負極の少なくとも一方の一端に設けられた複数の集電部を集めた集電群に接続された集電部材と、をケース内に備える蓄電装置であって、前記正極の集電群及び前記負極の集電群は同方向に延びており、前記集電部材は、正極集電部材と負極集電部材とで構成され、前記正極集電部材と前記負極集電部材とを一体化する絶縁部材を備えたことを特徴とする蓄電装置。
Claims (14)
- 複数の正極と負極を両者の間を絶縁した状態で交互に積層することによって形成される電極組立体と、
前記正極及び前記負極の少なくとも一方から電気を取り出すために、前記正極及び前記負極の少なくとも一方の一端に設けられた複数の集電部を集めた集電群に接続された集電部材と、
前記電極組立体と前記集電部材とを収容するケースと、を備える蓄電装置であって、
前記集電部材は、前記電極組立体と対向するとともに前記集電群に接続された接続面と、
前記接続面とは反対側に位置し、かつ前記ケースの壁と対向する対向面と、を有し、
絶縁部材が、前記集電部材と前記ケースの壁との間に配設されるとともに、前記対向面と前記ケースの壁とを離間させている、蓄電装置。 - 前記絶縁部材は、前記対向面と前記ケースの壁との間に介在する第1絶縁部と、該第1絶縁部の対辺から前記電極組立体に向けて延びるように立設される第2絶縁部とを有し、前記正極及び負極の積層方向における前記集電部材の両側に、前記第2絶縁部が配設されている請求項1に記載の蓄電装置。
- 前記集電部材は正極集電部材と負極集電部材とを含み、前記ケースの壁を貫通する正極端子及び負極端子それぞれに前記正極集電部材及び前記負極集電部材が接続されており、前記絶縁部材は、前記正極端子及び前記負極端子に当接可能な長さを有する請求項1又は請求項2に記載の蓄電装置。
- 前記絶縁部材は、前記正極端子及び前記負極端子にそれぞれ対向し且つ凹形の弧状に形成されている両端を有する請求項3に記載の蓄電装置。
- 前記集電部材及び前記絶縁部材の少なくとも一方は、前記絶縁部材と前記集電部材とを相互に位置決めするための位置決め部を有する請求項1~請求項4のうちいずれか一項に記載の蓄電装置。
- 前記位置決め部は、前記対向面に設けられた凹部又は凸部と、該凹部又は凸部と係合可能なように前記絶縁部材に設けられた係合凸部又は係合凹部とを含む請求項5に記載の蓄電装置。
- 前記位置決め部は、前記集電部材に係止可能なように前記絶縁部材に設けられる鉤状の係止部を含む請求項5に記載の蓄電装置。
- 前記位置決め部は、前記係止部と、該係止部が係止可能なように前記集電部材に形成された切欠とを含む請求項7に記載の蓄電装置。
- 前記絶縁部材は前記接続面に掛止する掛止部を有する請求項1~請求項8のうちいずれか一項に記載の蓄電装置。
- 前記絶縁部材は前記接続面に掛止する掛止部を有し、
前記第1絶縁部の対辺から前記第2絶縁部が曲げられることで前記掛止部が前記接続面に掛止しているとともに、前記第1絶縁部の対辺には、前記第2絶縁部の曲げ補助部が設けられている請求項2に記載の蓄電装置。 - 前記第2絶縁部は、各第2絶縁部の外側で前記ケースの内面に接触している請求項10に記載の蓄電装置。
- 前記集電群は前記電極組立体の一面から突出しており、前記集電群は、基端部及び先端部を有するとともに、基端部と先端部との間に曲げ部を有し、前記集電群は、前記曲げ部から先端部までの部位が前記正極及び負極の積層方向に延びるように、前記曲げ部において湾曲もしくは屈曲している請求項1~請求項11のうちいずれか一項に記載の蓄電装置。
- 前記集電群の先端部と前記電極組立体との間に設けられ、前記先端部を支持可能な支持部材を備える請求項12に記載の蓄電装置。
- 前記蓄電装置は二次電池である請求項1~請求項13のうちいずれか一項に記載の蓄電装置。
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US14/391,642 US9768422B2 (en) | 2012-04-17 | 2013-04-08 | Electricity storage device |
DE201311002085 DE112013002085T5 (de) | 2012-04-17 | 2013-04-08 | Elektrizitätsspeichervorrichtung |
CN201380019780.8A CN104221186B (zh) | 2012-04-17 | 2013-04-08 | 蓄电装置 |
JP2014511174A JP5935878B2 (ja) | 2012-04-17 | 2013-04-08 | 蓄電装置 |
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JP (1) | JP5935878B2 (ja) |
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JP2016091737A (ja) * | 2014-10-31 | 2016-05-23 | 株式会社豊田自動織機 | 蓄電装置 |
WO2016159099A1 (ja) * | 2015-03-31 | 2016-10-06 | 株式会社Gsユアサ | 蓄電素子 |
JP2018014289A (ja) * | 2016-07-22 | 2018-01-25 | 株式会社豊田自動織機 | 蓄電装置 |
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Also Published As
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JPWO2013157433A1 (ja) | 2015-12-21 |
DE112013002085T5 (de) | 2015-03-19 |
CN107123832A (zh) | 2017-09-01 |
CN104221186B (zh) | 2016-11-16 |
US9768422B2 (en) | 2017-09-19 |
JP5935878B2 (ja) | 2016-06-15 |
US20150104694A1 (en) | 2015-04-16 |
CN104221186A (zh) | 2014-12-17 |
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