WO2017110548A1 - 蓄電装置 - Google Patents

蓄電装置 Download PDF

Info

Publication number
WO2017110548A1
WO2017110548A1 PCT/JP2016/086875 JP2016086875W WO2017110548A1 WO 2017110548 A1 WO2017110548 A1 WO 2017110548A1 JP 2016086875 W JP2016086875 W JP 2016086875W WO 2017110548 A1 WO2017110548 A1 WO 2017110548A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
insulating
electrode
electrode assembly
negative electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/086875
Other languages
English (en)
French (fr)
Inventor
中村　知広
貴之 弘瀬
泰有 秋山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Priority to US15/779,603 priority Critical patent/US10862098B2/en
Priority to DE112016006034.3T priority patent/DE112016006034T5/de
Priority to CN201680074658.4A priority patent/CN108370020B/zh
Priority to KR1020187015979A priority patent/KR102053560B1/ko
Priority to JP2017557881A priority patent/JPWO2017110548A1/ja
Publication of WO2017110548A1 publication Critical patent/WO2017110548A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
    • H01G11/16—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against electric overloads, e.g. including fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H01G11/76—Terminals, e.g. extensions of current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/14—Protection against electric or thermal overload
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/008—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/10—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
    • H01M50/172—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
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • 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
    • H01M50/50—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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 including a current interrupting mechanism that interrupts a current in an energization path by deformation of a deformation plate when an internal pressure of a case reaches a set pressure.
  • a power storage device such as a lithium ion secondary battery or a nickel hydride secondary battery is mounted on a vehicle such as EV (Electric Vehicle) or PHV (Plug Hybrid Vehicle).
  • the power storage device stores power supplied to an electrical component such as an electric motor.
  • a secondary battery includes an electrode assembly in which a positive electrode and a negative electrode having an active material layer are stacked in layers, and a case for housing the electrode assembly.
  • Some cases include a case member having an opening for inserting the electrode assembly and a lid member for closing the opening of the case member. Tabs project from one side of the positive electrode and the negative electrode, and a conductive member for each electrode is joined to each tab.
  • electrode terminals of each electrode are electrically connected to each conductive member, and each electrode terminal is fixed to the lid member.
  • some secondary batteries have a current interrupting mechanism that interrupts current in response to an increase in the internal pressure of the case.
  • the current interruption mechanism is provided on an energization path that electrically connects the electrode terminal of one polarity and the electrode assembly (see, for example, Patent Document 1).
  • the current interruption mechanism is integrated with the positive electrode terminal, and is disposed in a space defined between the inner surface of the lid member and the end surface of the electrode assembly facing the inner surface.
  • Such a current interrupting mechanism can also be applied to a secondary battery including an electrode assembly having a tab by providing it in an energization path between the electrode terminal and the electrode assembly.
  • the positive electrode terminal and the negative electrode terminal are made of different materials. Therefore, the positive electrode terminal and the negative electrode terminal have different electric resistance and strength. Therefore, in order to reduce the difference in electrical resistance and strength between the two electrode terminals, the two electrode terminals are formed to have different shapes and dimensions. As a result, the distance from the positive electrode terminal to the electrode assembly is different from the distance from the negative electrode terminal to the electrode assembly.
  • the current interrupting device when applied to a secondary battery, it is arranged on one of the electrode terminals.
  • the member constituting the energization path is located between the electrode assembly and the positive electrode terminal.
  • the member has a portion protruding toward the electrode assembly. The distance from the portion of the member closest to the electrode assembly to the electrode assembly may be different from the distance from the negative electrode terminal to the electrode assembly. Even when the current interrupting device is disposed on the negative electrode terminal, the distance from the electrode assembly closest to the electrode assembly to the electrode assembly in the current interrupting device is different from the distance from the positive electrode terminal to the electrode assembly. There is.
  • the objective of this invention is providing the electrical storage apparatus which can suppress the local contact to an electrode assembly.
  • a power storage device for achieving the above object includes an electrode assembly in which electrodes of different polarities are insulated and stacked, a case housing the electrode assembly, and the electrode having the same polarity electrically First and second electrode terminals connected and fixed to the wall portion of the case, and a current interrupting mechanism electrically connected to the first electrode terminal.
  • the current interrupting mechanism has a structure that interrupts an electric current in an electrically energizing path between the electrode terminal and the electrode assembly when the internal pressure of the case reaches a set pressure.
  • the current cut-off mechanism includes a mechanism insulating portion that insulates the first electrode terminal including the current cut-off mechanism from the end face of the electrode assembly, the second electrode terminal, and the end face of the electrode assembly.
  • the protruding dimension from the wall part to the mechanism insulating part including the first electrode terminal is the same as the protruding dimension from the wall part to the terminal insulating part including the second electrode terminal.
  • the current interrupting mechanism and the electrode assembly can be insulated by the mechanism insulating part, and the second electrode terminal and the electrode assembly having no current interrupting mechanism are insulated by the terminal insulating part. Can do. And since the projecting dimension from the wall part to the mechanism insulating part and the projecting dimension from the wall part to the terminal insulating part are the same, the power storage device receives external force or vibrates, and the electrode Even when the assembly approaches the wall, the mechanism insulation and terminal insulation are in contact with the end face of the electrode assembly in the same manner, and a large contact area can be secured, and a current blocking mechanism is provided for the end face of the electrode assembly. Can be prevented from contacting locally.
  • the power storage device includes a pair of conductive members that connect the electrode and the electrode terminal having the same polarity and are disposed between the wall portion and the end surface, and a pair of the conductive member and the wall portion.
  • the terminal insulating part and the mechanism insulating part may be integrated with the conductive member insulating part.
  • the conductive member insulating portion, the terminal insulating portion, and the mechanism insulating portion are integrated, the conductive member insulating component, the current blocking mechanism insulating component, and the electrode terminal insulating portion are integrated. Compared with the case where the components are separated, the number of components of the power storage device can be reduced and assembly can be facilitated.
  • the current interrupting mechanism includes a deformable plate on which one of the inner pressures of the case acts on one surface and the outer pressure of the case acts on the other surface, and the electric current between the first electrode terminal and the electrode assembly is provided. A part of a typical energization path and disposed between the end face of the electrode assembly and the first electrode terminal.
  • the power storage device is a secondary battery.
  • FIG. 6A is a cross-sectional view taken along the line 6a-6a in FIG. 4 showing the mounting state of the insulating cover
  • FIG. 6B is a cross-sectional view taken along the line 6b-6b in FIG.
  • FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4 showing the vicinity of the external connection terminal. Sectional drawing which shows the contact state of an electrode assembly and an insulating cover.
  • the secondary battery 10 as a power storage device includes a case 11, and an electrode assembly 12 is accommodated in the case 11.
  • the case 11 includes a square box-shaped case member 14 and a lid member 15 as a rectangular flat plate-like wall portion that closes the opening 14 a of the case member 14.
  • the secondary battery 10 of this embodiment is a lithium ion battery.
  • the electrode assembly 12 includes a plurality of sheet-like positive electrodes 21 and a plurality of sheet-like negative electrodes 31, and the positive electrodes 21 and the negative electrodes 31 are electrodes having different polarities.
  • the positive electrode 21 has a positive metal foil (in this embodiment, an aluminum foil) and a positive electrode active material layer present on both surfaces of the positive metal foil.
  • the negative electrode 31 has a negative electrode metal foil (copper foil in this embodiment) and a negative electrode active material layer present on both surfaces of the negative electrode metal foil.
  • the electrode assembly 12 is a layered type in which a separator 24 is interposed between a plurality of positive electrodes 21 and a plurality of negative electrodes 31 to interpose them.
  • the positive electrode 21 has a tab 25 having a shape protruding from a part of one side 21 a of the positive electrode 21.
  • the negative electrode 31 has a tab 35 having a shape protruding from a part of one side 31 a of the negative electrode 31.
  • the plurality of positive electrode tabs 25 and the plurality of negative electrode tabs 35 are respectively provided at positions where the positive electrode tab 25 and the negative electrode tab 35 do not overlap with each other in a state where the positive electrode 21 and the negative electrode 31 are stacked.
  • the electrode assembly 12 has a tab side end face 12b formed by gathering together one side 21a of the positive electrode 21, one side 31a of the negative electrode 31, and one side of the separator 24.
  • the positive electrodes 21 constituting the electrode assembly 12 are stacked such that the tabs 25 are arranged in a row along the stacking direction.
  • the negative electrodes 31 constituting the electrode assembly 12 are stacked such that the tabs 35 are arranged in a row along the stacking direction.
  • the secondary battery 10 includes a positive electrode tab group 36 protruding from the tab side end face 12b.
  • the tab group 36 gathers all the positive electrode tabs 25 together on one side in the stacking direction of the electrode assembly 12, Configured.
  • the secondary battery 10 has a negative electrode tab group 36 protruding from the tab side end face 12 b, and this tab group 36 gathers all the negative electrode tabs 35 to one side in the stacking direction in the electrode assembly 12. It is configured by stacking.
  • the inner surface of the lid member 15 as the wall portion of the case 11 faces the tab groups 36 accommodated in the case 11 and the tab side end surface 12 b of the electrode assembly 12.
  • the direction connecting the inner surface of the lid member 15 and the tab side end surface 12b of the electrode assembly 12 with the shortest distance is defined as a facing direction Z.
  • a positive electrode conductive member 51 for electrically connecting the electrode assembly 12 and a positive electrode terminal structure 16 described later is joined to the positive electrode tab group 36. Further, the negative electrode tab group 36 is joined with a negative electrode conductive member 52 for electrically connecting the electrode assembly 12 and a negative electrode terminal structure 17 described later.
  • a positive electrode conductive member 51 and a negative electrode conductive member 52 are disposed between the inner surface of the lid member 15 and the tab side end surface 12 b of the electrode assembly 12.
  • the positive electrode conductive member 51 is joined to the tab group 36 and includes a substantially U-shaped tab joint portion 51a on one side in the longitudinal direction. Further, the positive electrode conductive member 51 includes a flat plate terminal connection portion 51b connected to the positive electrode lead terminal 60 described later on the other side in the longitudinal direction, and the tab joint portion 51a and the terminal connection portion 51b are continuous in the longitudinal direction. .
  • the negative electrode conductive member 52 includes a substantially U-shaped tab joint portion 52 a electrically joined to the tab group 36 on one side in the longitudinal direction. Further, the negative electrode conductive member 52 includes a terminal connection portion 52b electrically connected to a negative electrode lead terminal 61, which will be described later, on the other side in the longitudinal direction, and the tab joint portion 52a and the terminal connection portion 52b are continuous in the longitudinal direction. .
  • the lid member 15 has an outer surface 15c facing the outer side of the case 11 and an inner surface 15d facing the inner side of the case 11.
  • a direction connecting the outer surface 15c and the inner surface 15d with the shortest distance is a thickness direction.
  • the lid member 15 includes locking recesses 18 on both sides in the longitudinal direction. Each locking recess 18 has a shape recessed from the outer surface 15c along the thickness direction. When the lid member 15 is viewed from the outer surface 15c, the outer shape of the locking recess 18 is a square shape.
  • the lid member 15 includes a protrusion 19 protruding from the inner surface 15d.
  • the protrusion 19 has a shape protruding from the inner surface 15d by denting the locking recess 18, and the outer shape of the protrusion 19 is a quadrangular shape.
  • the lid member 15 is provided with insertion holes 15e outside the respective locking recesses 18 in the longitudinal direction.
  • the positive terminal structure 16 and the negative terminal structure 17 include an outer insulating member 57 disposed on the outer surface 15 c of the lid member 15.
  • the outer insulating member 57 insulates the positive external connection terminal 66 and positive electrode lead terminal 60 from the lid member 15 and insulates the negative external connection terminal 66 and negative electrode lead terminal 61 from the lid member 15.
  • the outer insulating member 57 is made of synthetic resin.
  • the outer insulating member 57 has a rectangular shape when viewed from the outer surface 15 c of the lid member 15.
  • the direction connecting the front surface 57c and the back surface 57a of the outer insulating member 57 is the thickness direction.
  • the outer insulating member 57 includes a detent portion 58 that protrudes in the thickness direction from the back surface 57a near one end in the longitudinal direction.
  • the anti-rotation part 58 has a shape protruding in a square hole shape from the front surface 57c toward the back surface 57a.
  • the square shape formed by connecting the four outer surfaces of the rotation stopper 58 is similar to the square shape formed by connecting the four inner surfaces of the locking recess 18 of the lid member 15.
  • the outer insulating member 57 is installed on the lid member 15 in a state where the rotation stopper 58 is inserted into the locking recess 18.
  • the four outer surfaces of the rotation stopper 58 are in contact with and locked with the four inner surfaces of the locking recess 18.
  • the outer insulating member 57 includes an insertion hole 57d near the end on the opposite side to the rotation stopper 58 in the longitudinal direction.
  • the insertion hole 57d is at a position that coincides with the insertion hole 15e of the lid member 15.
  • the positive electrode terminal structure 16 and the negative electrode terminal structure 17 include an external connection terminal 66 arranged outside the lid member 15, and the external connection terminal 66 can fix the bus bar outside the lid member 15.
  • the external connection terminal 66 is made of metal.
  • the external connection terminal 66 includes a prism-shaped bolt head 67, a shaft 68 having a shape protruding from one end surface of the bolt head 67 along the axial direction of the external connection terminal 66, and the other end surface of the bolt head 67. And an engaging projection 69 having a shape protruding from the projection.
  • a nut for fastening a bus bar can be screwed onto the shaft portion 68.
  • the engaging projection 69 has a quadrangular shape when viewed in the axial direction.
  • the quadrangular shape formed by connecting the four outer surfaces of the engaging convex portion 69 is similar to the quadrangular shape formed by connecting the four inner surfaces of the anti-rotation portion 58 of the outer insulating member 57.
  • the engaging convex portion 69 of the external connection terminal 66 is inserted into the rotation preventing portion 58 of the outer insulating member 57.
  • the four outer surfaces of the engaging convex portion 69 are in contact with the four inner surfaces of the rotation preventing portion 58. By this contact, the movement of the external connection terminal 66 in the direction along the surface 57c of the outer insulating member 57 is restricted, and in particular, the rotation on the surface 57c of the outer insulating member 57 is restricted.
  • the positive electrode terminal structure 16 includes a positive electrode lead terminal 60 as an electrode terminal electrically connected to the positive electrode tab group 36 of the electrode assembly 12 via the positive electrode conductive member 51.
  • the negative electrode terminal structure 17 includes a negative electrode lead terminal 61 as an electrode terminal electrically connected to the negative electrode tab group 36 of the electrode assembly 12 via the negative electrode conductive member 52.
  • the positive electrode lead terminal 60 includes a connecting shaft portion 60 a that is electrically connected to a terminal connection member 44 described later and a base portion 60 b that is electrically connected to the terminal connection portion 51 b of the positive electrode conductive member 51 in the axial direction.
  • the terminal connection member 44 includes a connection piece 46 connected to the external connection terminal 66 on one side in the longitudinal direction, and a fixed piece 47 on the other side in the longitudinal direction.
  • the terminal connection member 44 includes a through hole 46a that penetrates the connection piece 46 in the thickness direction, and the shaft portion 68 of the external connection terminal 66 is inserted into the through hole 46a.
  • the terminal connection member 44 includes an insertion hole 47a that penetrates the fixed piece 47 in the thickness direction.
  • a base portion 60b of the positive electrode lead terminal 60 is disposed so as to protrude from the inner surface 15d of the lid member 15 into the case 11, and a connecting shaft portion 60a includes an insertion hole 51c of the positive electrode conductive member 51, an inner insulation described later.
  • the insertion hole 40 a of the member 40, the insertion hole 15 e of the lid member 15, the insertion hole 57 d of the outer insulating member 57, and the insertion hole 47 a of the terminal connection member 44 are penetrated.
  • the positive electrode terminal structure 16 includes an O-ring 73, and a connecting shaft portion 60 a for the positive electrode lead terminal 60 is inserted into the O-ring 73, and the O-ring 73 is connected to the terminal connection portion 51 b of the positive electrode conductive member 51. It is supported. Further, the positive electrode terminal structure 16 includes the above-described inner insulating member 40 through which the connecting shaft portion 60a is inserted.
  • the inner insulating member 40 has a square plate shape. The dimension of the inner insulating member 40 along the short direction of the lid member 15 is larger than the dimension of the positive electrode conductive member 51 along the short direction of the lid member 15. Therefore, the inner insulating member 40 protrudes from the positive electrode conductive member 51 along the short direction of the lid member 15.
  • an O-ring 73 supported by the terminal connection portion 51 b is disposed inside the inner insulating member 40.
  • the inner insulating member 40 is interposed between the lid member 15 and the terminal connection portion 51b, restricts the contact between the lid member 15 and the terminal connection portion 51b, and insulates the lid member 15 from the positive electrode conductive member 51. To do.
  • the tip end portion of the connecting shaft portion 60a penetrating the insertion hole 47a of the terminal connecting member 44 is caulked in the axial direction, whereby the positive electrode conductive member 51, the inner insulating member 40, and the lid member are connected by the connecting shaft portion 60a and the base portion 60b. 15, the outer insulating member 57 and the fixing piece 47 of the terminal connection member 44 are sandwiched.
  • the positive electrode lead terminal 60 is fixed to the lid member 15 by this clamping.
  • the O-ring 73 is in close contact with the periphery of the insertion hole 15 e in the inner surface 15 d of the lid member 15 and seals the insertion hole 15 e of the lid member 15.
  • the tip end portion of the connecting shaft portion 60a of the positive electrode lead terminal 60 is locked to the surface of the fixing piece 47 in the terminal connection member 44, and the positive electrode lead terminal 60 and the terminal connection member 44 are electrically connected by this lock. It is connected. Further, the base portion 60 b of the positive electrode lead terminal 60 contacts the terminal connection portion 51 b of the positive electrode conductive member 51, and the positive electrode lead terminal 60 and the positive electrode conductive member 51 are electrically connected by this contact.
  • the negative electrode lead terminal 61 includes a connection shaft portion 62 that is electrically connected to the negative electrode terminal connection member 44, and a base portion 63 that is electrically connected to the terminal connection portion 52 b of the negative electrode conductive member 52.
  • the connecting shaft portion 62 of the negative electrode lead terminal 61 is inserted into the insertion hole 40 a of the inner insulating member 40, the insertion hole 15 e of the lid member 15, the insertion hole 57 d of the outer insulating member 57, and the insertion hole 47 a of the terminal connection member 44. Yes.
  • the base 63 of the negative electrode lead terminal 61 has a quadrangular prism shape.
  • the outer shape of the base 63 is a square shape when the negative electrode lead terminal 61 is viewed from the axial direction.
  • the negative electrode lead terminal 61 includes a shaft hole 64 penetrating in the axial direction, and the shaft hole 64 passes through the connecting shaft portion 62 and the base portion 63.
  • the negative electrode lead terminal 61 includes a terminal end surface 63b on an end surface of the base 63 facing the tab side end surface 12b of the electrode assembly 12, and a recess 63c that is recessed from the terminal end surface 63b toward the connecting shaft portion 62. Prepare.
  • the recess 63 c communicates with the shaft hole 64.
  • the terminal end surface 63b has an annular shape surrounding the recess 63c.
  • the negative electrode terminal structure 17 has an O-ring 73, and a connecting shaft portion 62 is inserted into the O-ring 73, and the O-ring 73 is supported by the base 63.
  • the negative electrode terminal structure 17 includes a cylindrical inner insulating member 40 through which the connecting shaft portion 62 is inserted.
  • An O-ring 73 supported by the base 63 is disposed inside the inner insulating member 40.
  • the inner insulating member 40 is interposed between the lid member 15 and the base portion 63 of the negative electrode extraction terminal 61, restricts the contact between the lid member 15 and the base portion 63, and includes the lid member 15 and the negative electrode extraction terminal 61. Insulate.
  • the negative inner insulating member 40 covers the outer peripheral surface of the base 63 and insulates the negative lead terminal 61 from the case 11.
  • the distal end portion of the connecting shaft portion 62 penetrating the insertion hole 47 a of the terminal connecting member 44 is caulked in the axial direction, whereby the inner insulating member 40, the lid is covered by the connecting shaft portion 62 and the base portion 63.
  • the member 15, the outer insulating member 57, and the terminal connection member 44 are sandwiched.
  • the O-ring 73 is in close contact with the periphery of the insertion hole 15 e in the inner surface 15 d of the lid member 15 and seals the insertion hole 15 e of the lid member 15.
  • the distal end portion of the connecting shaft portion 62 of the negative electrode lead terminal 61 is locked to the surface of the fixing piece 47 of the terminal connection member 44, and the negative electrode lead terminal 61 and the terminal connection member 44 are electrically connected by this lock. It is connected.
  • the secondary battery 10 includes a current interrupt mechanism 80 electrically connected to a negative electrode lead terminal 61 as a first electrode terminal.
  • the positive electrode lead terminal 60 is a second electrode terminal.
  • the current interrupting mechanism 80 is disposed inside the case 11, and when the internal pressure of the case 11 reaches a predetermined set pressure, the energization that electrically connects the electrode assembly 12 and the negative electrode lead terminal 61. Cut off the current in the path.
  • the current interrupt mechanism 80 is located at the base 63 of the negative electrode lead terminal 61 and the connection part of the terminal connection part 52 b of the negative electrode conductive member 52.
  • the current interruption mechanism 80 is integrally incorporated in the negative electrode lead terminal 61.
  • the base 63 of the negative electrode lead terminal 61 is electrically connected to the negative electrode conductive member 52 via the current interrupt mechanism 80, and the negative electrode conductive member 52 is electrically connected to the negative electrode tab group 36.
  • an energization path between the electrode assembly 12 and the negative electrode extraction terminal 61 is configured.
  • the current interruption mechanism 80 When the current interruption mechanism 80 is operated by the gas generated inside the case 11, the electric connection between the base portion 63 of the negative electrode lead terminal 61 and the negative electrode conductive member 52 is interrupted. That is, the current interruption mechanism 80 constitutes a part of the energization path when not operating, and interrupts the energization path when activated by receiving the pressure of the gas generated inside the case 11.
  • the current interrupting mechanism 80 has a contact plate 81 joined to the terminal connection part 52 b and the base part 63 of the negative electrode conductive member 52.
  • the contact plate 81 is made of a conductive material and has a bowl shape that protrudes toward the electrode assembly 12.
  • the contact plate 81 covers the recess 63c of the base 63 from the electrode assembly 12 side.
  • the outer peripheral portion of the contact plate 81 that protrudes from the recess 63c and the terminal end surface 63b of the base 63 are fixed by welding.
  • the portion of the contact plate 81 that faces the recess 63c is convex toward the electrode assembly 12 (downward) in the normal state, and the portion that is convex toward the electrode assembly 12 and the negative electrode conductive member 52.
  • the terminal connection portion 52b is welded.
  • the negative electrode welded portion P which is a welded portion between the contact plate 81 and the terminal connection portion 52b, is a conductive portion that conducts the negative electrode lead terminal 61 and the negative electrode conductive member 52. Therefore, the negative electrode conductive member 52 and the negative electrode lead terminal 61 are electrically connected via the contact plate 81.
  • the current interrupt mechanism 80 includes an insulating ring 82 disposed between the base 63 and the negative electrode conductive member 52, and a seal ring 83 disposed on the outer peripheral side of the insulating ring 82.
  • the negative electrode conductive member 52 has a deformation recess 53a on the surface of the terminal connection portion 52b facing the electrode assembly 12.
  • the deformation recess 53 a is recessed in a mortar shape from the electrode assembly 12 toward the lid member 15.
  • the negative electrode weld portion P is located on the bottom surface of the deformation recess 53a.
  • the terminal connection portion 52b has a fracture groove (not shown) at a portion that becomes the bottom surface of the deformation recess 53a.
  • the fracture groove has an annular shape surrounding the negative electrode welded portion P.
  • the current interruption mechanism 80 has a deformation plate 85 that receives the internal pressure of the case 11 and deforms.
  • the deformation plate 85 is a diaphragm made of an elastic material, for example, a metal plate, and is disposed at a position closer to the electrode assembly 12 than the terminal connection portion 52b.
  • the deformation plate 85 has a disk shape and covers the deformation concave portion 53a from the electrode assembly 12 side.
  • the outer peripheral portion of the deformable plate 85 and the terminal connection portion 52b are fixed by welding over the entire periphery of the outer peripheral portion of the deformable plate 85.
  • the deformation plate 85 airtightly separates the inside of the case 11 from the outside of the case 11.
  • the deformable plate 85 is convex from the lid member 15 side toward the electrode assembly 12 side (downward), and a portion of the convex portion facing the negative electrode welded portion P is directed to the lid member 15. And has a protrusion 85a protruding.
  • the protrusion 85a is made of an insulating material and faces the negative electrode welded portion P surrounded by the fracture groove.
  • the internal pressure of the case 11 acts on one surface of the deformation plate 85 (the surface facing the electrode assembly 12). Further, external pressure (substantially atmospheric pressure) of the case 11 acts on the other surface of the deformation plate 85 (surface facing the lid member 15) via the shaft hole 64 of the negative electrode lead terminal 61.
  • the deformation plate 85 is configured to be deformed by the pressure and protrude toward the lid member 15 when an internal pressure that reaches the set pressure is applied to the surface facing the electrode assembly 12. Yes.
  • the deformation plate 85 is deformed toward the lid member 15, and the protrusion 85 a is formed between the terminal connection portion 52 b and the contact plate.
  • the negative electrode weld part P with 81 is fractured. As a result, the electrical connection between the negative electrode lead terminal 61 and the negative electrode conductive member 52 is interrupted, and the current in the energization path is interrupted.
  • the insulating cover 90 in the case 11 will be described.
  • the insulating cover 90 includes a positive electrode conductive member 51, a negative electrode conductive member 52, and a conductive member insulating portion 91 interposed between the lid member 15 in the facing direction Z.
  • the insulating cover 90 includes a mechanism insulating portion 93 that insulates the negative electrode lead terminal 61 including the current interruption mechanism 80 from the tab side end surface 12 b of the electrode assembly 12, and the positive electrode lead terminal 60 and the tab of the electrode assembly 12.
  • a terminal insulating portion 92 that insulates the side end face 12b.
  • the insulating cover 90 is substantially U-shaped in a side view along the longitudinal direction.
  • the mechanism insulating portion 93 is integrated with one end portion in the longitudinal direction of the rectangular conductive member insulating portion 91, and the terminal insulating portion 92 is the other end portion in the longitudinal direction of the conductive member insulating portion 91. It is integral. That is, the conductive member insulating portion 91, the terminal insulating portion 92, and the mechanism insulating portion 93 are formed of a single member.
  • the conductive member insulating portion 91 is L-shaped in a side view as viewed along the longitudinal direction, and has a shape protruding toward the electrode assembly 12 from the insulating portion main body 91a and one long edge portion of the insulating portion main body 91a. Side wall portion 91b.
  • the longitudinal direction of the insulating cover 90 is along the juxtaposed direction.
  • a dimension of a straight line connecting the opposing surfaces of the pair of inner insulating members 40 along the juxtaposed direction is defined as a dimension N.
  • the dimension of the conductive member insulating portion 91 in the longitudinal direction is slightly longer than the dimension N. For this reason, one end surface of both end surfaces in the longitudinal direction of the conductive member insulating portion 91 can contact the inner surface of the positive inner insulating member 40, and the other end surface can contact the inner surface of the negative inner insulating member 40. It is in a position where it can touch.
  • the dimension in the short direction of the conductive member insulating portion 91 is slightly longer than the dimension in the short direction of the tab joint portions 51a and 52a.
  • the insulating portion main body 91a of the conductive member insulating portion 91 is interposed between the positive and negative tab joint portions 51a and 52a in the facing direction Z and the lid member 15, and the tab joint portions 51a and 52a and the lid member 15 are interposed. And insulate. Further, the side wall portion 91 b of the conductive member insulating portion 91 is interposed between each tab group 36 and the inner surface of the long side wall of the case member 14 to insulate each tab group 36 from the case member 14.
  • the insulating cover 90 includes housing recesses 91f at both longitudinal ends of the insulating body 91a.
  • the housing recess 91 f has a shape that is recessed in a square shape from the outer surface 91 c of the insulating portion main body 91 a toward the electrode assembly 12.
  • the protrusions 19 of the lid member 15 are inserted into the respective housing recesses 91f, and in the longitudinal direction and the short direction of the insulating cover 90 due to the contact between the outer surface of the protrusions 19 and the inner surface of the housing recess 91f.
  • the movement of the insulating cover 90 along is restricted.
  • the insulating cover 90 includes a connecting portion 94 that is integral with both ends in the longitudinal direction of the side wall 91 b of the conductive member insulating portion 91 and at one end in the short direction. And the mechanism insulation part 93 is connected with the connection part 94 of the longitudinal direction one end, and the terminal insulation part 92 is connected with the connection part 94 of the longitudinal direction other end of the side wall part 91b.
  • the insulating portion main body 91a and the terminal insulating portion 92, and the insulating portion main body 91a and the mechanism insulating portion 93 are separated in the facing direction Z by the connecting portion 94.
  • the insulating portion main body 91 a includes an inner surface 91 d on a surface facing the tab side end surface 12 b of the electrode assembly 12.
  • the terminal insulating portion 92 has a quadrangular shape when viewed from the outer surface 15 c of the lid member 15.
  • the planar view size of the terminal insulating portion 92 is larger than the planar view size of the base portion 60b of the positive electrode lead terminal 60, and the entire base portion 60b can be covered from the electrode assembly 12 side.
  • the terminal insulating portion 92 includes an inner surface 92b that faces the base portion 60b of the positive electrode lead terminal 60 and an outer surface 92d that faces the tab-side end surface 12b of the electrode assembly 12, and the outer surface 92d is flat.
  • the terminal insulating portion 92 includes a protruding portion 92e near the insulating portion main body 91a in the inner surface 92b, and the protruding portion 92e exists over the entire short side direction of the insulating cover 90. Further, the protruding portion 92e is located closer to the terminal insulating portion 92 than the insulating portion main body 91a. In the facing direction Z, the insulating portion main body 91a and the protruding portion 92e do not overlap and are displaced in the longitudinal direction. .
  • the insulating cover 90 includes a positive electrode side gap 95a between the insulating body 91a and the protrusion 92e in the facing direction Z.
  • the positive electrode side gap 95a is connected to the connecting portion 94 in the short direction of the insulating cover 90. Open at the opposite end.
  • the dimension of the positive electrode side gap 95a along the facing direction Z is larger than the thickness of the positive electrode conductive member 51, and the terminal connection portion 51b is inserted into the positive electrode side gap 95a.
  • the terminal insulating portion 92 includes a rib 92 g at a position that becomes the longitudinal end portion of the insulating cover 90. The rib 92g exists over the entire short side direction of the insulating cover 90.
  • the insulating portion main body 91a of the insulating cover 90 is supported by the tab joint portion 51a of the positive electrode conductive member 51, and the insulating portion main body 91a is sandwiched between the tab joint portion 51a and the lid member 15 along the facing direction Z. ing.
  • the connecting portion 94 is located at one end portion of the protruding portion 92e, and the locking claw 92a is present at the other end portion.
  • the locking claw 92a of the terminal insulating portion 92 protrudes in the facing direction Z from the protruding portion 92e.
  • the dimension between the opposing surfaces of the connecting part 94 and the protrusion 92e along the short direction of the insulating cover 90 is larger than the dimension of the positive electrode conductive member 51 along the short direction and slightly larger than the dimension of the inner insulating member 40 of the positive electrode. long.
  • the connecting portion 94 comes into contact with one of the edges of the inner insulating member 40 facing the short side of the insulating cover 90, and FIG. ), The locking claw 92a is locked to the other edge.
  • the tip surface of the rib 92g along the facing direction Z is in contact with the surface of the inner insulating member 40 facing the electrode assembly 12.
  • the mechanism insulating portion 93 has a quadrangular shape when viewed from the outer surface 15 c of the lid member 15.
  • the size in plan view of the mechanism insulating portion 93 is substantially the same as the size in plan view of the base 63 of the negative electrode lead terminal 61 and the current interrupt mechanism 80, and the entire current interrupt mechanism 80 can be covered from the electrode assembly 12 side.
  • the mechanism insulating portion 93 includes an inner surface 93 b that faces the deformation plate 85 of the current interrupt mechanism 80, an outer surface 93 d that faces the electrode assembly 12, and the outer surface 93 d has a flat surface shape.
  • the mechanism insulating portion 93 includes a protrusion 93e on the inner surface 93b near the insulating portion main body 91a, and the protrusion 93e exists over the entire short side direction of the insulating cover 90. In the facing direction Z, the insulating portion main body 91a and the protruding portion 93e are in overlapping positions.
  • the insulating cover 90 includes a negative electrode side gap 95b between the insulating main body 91a and the protrusion 93e in the facing direction Z.
  • the negative electrode side gap 95b is opposite to the connecting portion 94 in the short direction of the insulating cover 90. Open at the end.
  • the dimension of the negative electrode side gap 95b along the facing direction Z is larger than the thickness of the tab joint portion 52a of the negative electrode conductive member 52, and the negative electrode tab joint portion 52a is inserted into the negative electrode side gap 95b.
  • the insulating portion main body 91a of the insulating cover 90 is supported by the tab joint portion 52a, and the insulating portion main body 91a is sandwiched between the tab joint portion 52a and the lid member 15 along the facing direction Z.
  • the mechanism insulating portion 93 includes a rib 93g along the edge of the inner surface 93b, and the rib 93g is L-shaped in plan view.
  • the dimension from the outer surface 92d of the terminal insulating portion 92 to the tip end surface of the rib 92g is the height H1
  • the outer surface 93d of the mechanism insulating portion 93 to the tip end surface of the rib 93g is the height H2.
  • the height H1 of the rib 92g of the terminal insulating portion 92 is higher than the height H2 of the rib 93g of the mechanism insulating portion 93.
  • the connecting portion 94 is located at one end of the negative-side protrusion 93e and the engaging claw 93a at the other end of the both ends along the short direction of the insulating cover 90.
  • the locking claw 93a of the mechanism insulating portion 93 protrudes in the facing direction Z from the protruding portion 93e.
  • the dimension between the opposing surfaces of the connecting portion 94 and the protrusion 93e along the short direction of the insulating cover 90 is slightly larger than the dimension along the short direction of the tab joint portion 52a.
  • the connecting portion 94 abuts on one of the edge portions of the tab joint portion 52a facing the short side direction of the insulating cover 90, and the other edge portion.
  • the latching claw 93a is latched to the.
  • the tip surface of the rib 93g along the facing direction Z is in contact with the surface facing the electrode assembly 12 in the terminal connection portion 52b.
  • the mechanism insulating portion 93 is provided with an escape recess 93f penetrating in the thickness direction at the center, and the deformation plate 85 of the current interrupt mechanism 80 enters the escape recess 93f. Yes.
  • the internal pressure of the case 11 acts on the lower surface of the deformable plate 85 (the surface facing the electrode assembly 12) via the relief recess 93f.
  • the height H2 from the outer surface 93d to the leading end surface of the rib 93g is lower than the height H1 from the outer surface 92d to the leading end surface of the rib 92g in the terminal insulating portion 92.
  • the dimension L1 from the inner surface 15d of the lid member 15 to the base portion 60b of the positive electrode lead terminal 60 along the facing direction Z is from the inner surface 15d of the lid member 15 to the terminal connection portion 52b including the current interruption mechanism 80. It is smaller than the dimension L2.
  • the rib 93 g of the mechanism insulating portion 93 is in contact with the terminal connecting portion 52 b, and the rib 92 g of the terminal insulating portion 92 is in contact with the terminal connecting portion 51 b of the positive electrode conductive member 51.
  • the dimension from the inner surface 15d of the lid member 15 to the outer surface 92d of the terminal insulating portion 92 is defined as a protruding dimension M1 of the positive electrode terminal structure 16.
  • a dimension from the inner surface 15d of the lid member 15 to the outer surface 93d of the mechanism insulating portion 93 is defined as a protruding dimension M2 of the negative electrode terminal structure 17.
  • the protruding dimension M2 in the negative electrode terminal structure 17 and the protruding dimension M1 in the positive electrode terminal structure 16 are the same.
  • the distance between the outer surface 92d of the terminal insulating portion 92 and the tab side end surface 12b of the electrode assembly 12 is the same as the distance between the outer surface 93d of the mechanism insulating portion 93 and the tab side end surface 12b of the electrode assembly 12. It is.
  • the outer surface 92 d of the terminal insulating part 92 is flush with the outer surface 93 d of the mechanism insulating part 93.
  • the current interruption mechanism 80 is not integrated with the base portion 60 b of the positive electrode extraction terminal 60, but in the negative electrode terminal structure 17, the current interruption mechanism 80 is integrated with the base portion 63 of the negative electrode extraction terminal 61. Yes.
  • the negative electrode terminal structure 17 protrudes from the lid member 15 toward the electrode assembly 12, and the dimension L2 of the negative electrode terminal structure 17 is larger than the dimension L1 of the positive electrode terminal structure 16.
  • the height H2 of the mechanism insulating portion 93 is made lower than the height H1 of the terminal insulating portion 92, and the difference in the protruding dimensions of the positive terminal structure 16 and the negative terminal structure 17 from the lid member 15 is determined by the insulating cover.
  • the outer surface 93d of the mechanism insulating part 93 and the outer surface 92d of the terminal insulating part 92 are flush with each other while the insulating cover 90 covers the current interrupting mechanism 80 from the electrode assembly 12 side.
  • a contact plate 81 is joined to the terminal end face 63b of the negative electrode lead terminal 61 of the negative electrode, and the contact plate 81, the insulating ring 82, the seal ring 83, and the negative electrode conductive member 52 (terminal connection portion 52b) are unitized. Shall. Further, it is assumed that the deformable plate 85 is joined to the terminal connection portion 52b of the negative electrode conductive member 52, and the negative electrode lead terminal 61, the current interruption mechanism 80, and the negative electrode conductive member 52 are integrated in advance.
  • the outer insulating member 57 is disposed on the outer surface 15 c of the lid member 15 in a state in which the detents 58 of the outer insulating member 57 are inserted into the respective locking recesses 18 of the lid member 15.
  • the engaging projection 69 of the external connection terminal 66 is inserted into the rotation stopper 58 of the outer insulating member 57.
  • the shaft portion 68 of the external connection terminal 66 is inserted into the through hole 46 a of the terminal connection member 44.
  • the O-ring 73 and the inner insulating member 40 are disposed on the inner surface 15d side of the lid member 15 and the positive electrode conductive member 51 is disposed.
  • the connecting shaft portion 62 of the positive electrode lead terminal 60 is connected to the positive electrode conductive member 51.
  • the positive electrode conductive member 51, the inner insulating member 40, the lid member 15, and the outer insulating member 57 are interposed between the base portion 60b and the distal end portion of the connecting shaft portion 60a by caulking the connecting shaft portion 60a of the positive electrode lead terminal 60.
  • the terminal connection member 44 are integrated.
  • the O-ring 73 and the inner insulating member 40 are arranged on the inner surface 15 d side of the lid member 15, and the insertion hole 40 a of the inner insulating member 40, the O-ring 73, the insertion hole 15 e of the lid member 15, and the terminal connection member 44.
  • the connecting shaft portion 62 of the negative electrode lead terminal 61 is inserted into the insertion hole 47a.
  • the inner insulating member 40, the lid member 15, the outer insulating member 57, and the terminal connecting member 44 are integrated between the base 63 and the distal end portion of the connecting shaft portion 62 by caulking the connecting shaft portion 62.
  • the current interrupt mechanism 80 is also integrated.
  • the positive terminal structure 16 and the negative terminal structure 17 are formed on the lid member 15, and the lid terminal assembly 20 is formed.
  • the outer insulating member 57 is rotated on the lid member 15 by the engagement between the outer surface of the rotation preventing portion 58 of the outer insulating member 57 and the inner surface of the locking recess 18 of the lid member 15. Is regulated.
  • the rotation of the external connection terminal 66 is restricted by the engagement between the inner surface of the rotation stopper 58 of the outer insulating member 57 whose rotation is restricted and the outer surface of the engagement projection 69 of the external connection terminal 66.
  • the lid terminal assembly 20 there is a gap between the lid member 15 and the tab joints 51a and 52a in the facing direction Z. Further, the tab joint portions 51 a and 52 a are L-shaped, and the tab joint portions 51 a and 52 a have a portion protruding from the lid member 15.
  • the positive electrode tab group 36 of the electrode assembly 12 is joined to the tab joint portion 51 a of the positive electrode conductive member 51 by laser welding, and the negative electrode tab group 36 is laser-bonded to the tab joint portion 52 a of the negative electrode conductive member 52. Joined by welding. Then, the lid terminal assembly 20 and the electrode assembly 12 are integrated.
  • the tab joint portions 51a and 52a are bent into a substantially U shape, and the tab group 36 is bent. And as shown in FIG. 7, while inserting the insulation part main body 91a of the insulation cover 90 between the cover member 15 and the tab junction parts 51a and 52a in the opposing direction Z, the positive electrode conductive member 51 is inserted into the positive electrode side gap 95a. Then, the insulating cover 90 is slid so as to insert the negative electrode conductive member 52 into the negative electrode side gap 95b.
  • the insulating cover 90 is integrally assembled with the positive electrode conductive member 51 and the negative electrode conductive member 52, and the tab joint portions 51a and 52a are insulated from the lid member 15 by the insulating portion main body 91a.
  • terminal insulating portion 92 insulates the base portion 60b of the positive electrode lead terminal 60 from the electrode assembly 12 and the mechanism insulating portion 93 insulates the current interruption mechanism 80 from the electrode assembly 12, while protecting the deformation plate 85.
  • the electrode assembly 12 is inserted into the case member 14 from the opening 14 a of the case member 14.
  • the lid terminal assembly 20 is pushed toward the case member 14 in order to push the electrode assembly 12 into the case member 14.
  • the electrode assembly 12 Pressed is shown in FIG. 9, while the outer surface 92d of the terminal insulating portion 92 of the insulating cover 90 and the outer surface 93d of the mechanism insulating portion 93 are simultaneously in contact with the tab side end surface 12b of the electrode assembly 12, the electrode assembly 12 Pressed.
  • the secondary battery 10 is assembled. According to the above embodiment, the following effects can be obtained.
  • the projecting dimension M2 up to is the same. Therefore, when the secondary battery 10 is initially charged or when the secondary battery 10 is used, an external force acts on the secondary battery 10 or receives vibration, and the electrode assembly 12 moves toward the lid member 15. Then, the tab side end surface 12b of the electrode assembly 12 contacts both the terminal insulating portion 92 and the mechanism insulating portion 93.
  • both the terminal insulation part 92 and the mechanism insulation part 93 are plate-shaped, and the outer surfaces 92d and 93d are flat surface shapes, the contact area with the tab side end surface 12b can be ensured widely. Therefore, for example, when the secondary battery 10 vibrates, the current interruption mechanism 80 can be prevented from locally contacting the tab side end surface 12b of the electrode assembly 12, and the tab side end surface 12b is not easily damaged.
  • the terminal insulating portion 92 and the outer surface 92d of the mechanism insulating portion 93 with respect to the tab side end surface 12b. , 93d come into contact with each other, and the load applied to the electrode assembly 12 is dispersed. For this reason, when the electrode assembly 12 is inserted into the case member 14, the terminal insulating portion 92 and the mechanism insulating portion 93 are not locally in contact with the tab side end surface 12b, and the tab side end surface 12b is not easily damaged.
  • the rib 92g of the terminal insulating part 92 is in contact with the inner insulating member 40, and in the negative electrode terminal structure 17, the rib 93g of the mechanism insulating part 93 is in contact with the terminal connecting part 52b.
  • the height H1 at the rib 92g of the terminal insulating portion 92 is made higher than the height H2 at the rib 93g of the mechanism insulating portion 93. Due to the difference in height, the protruding dimension M1 of the positive terminal structure 16 and the negative terminal The protrusion dimension M2 of the structure 17 can be made the same.
  • the deformation plate 85 of the current interruption mechanism 80 is covered from the electrode assembly 12 side by the mechanism insulating portion 93 of the insulating cover 90. For this reason, when the secondary battery 10 is initially charged or when the secondary battery 10 is used, even if an external force is applied to the secondary battery 10 or vibration is applied, the tab-side end surface 12b of the electrode assembly 12 is not affected.
  • the contact with the deformation plate 85 can be restricted, the deformation of the deformation plate 85 can be suppressed, and the malfunction of the current interrupt mechanism 80 can be suppressed.
  • the insulating cover 90 includes a conductive member insulating portion 91 that insulates the tab joint portions 51a and 52a and the lid member 15, a terminal insulating portion 92 that insulates the positive electrode lead terminal 60 from the electrode assembly 12, and a current interruption mechanism.
  • a mechanism insulating portion 93 that insulates 80 from the electrode assembly 12 is integrally provided. Therefore, as compared with the case where the tab joining portions 51a and 52a and the insulating member of the lid member 15, the positive electrode lead terminal 60 and the insulating member of the electrode assembly 12, and the current interrupting mechanism 80 and the insulating member of the electrode assembly 12 are provided separately. And the number of parts of the secondary battery 10 can be reduced, and the assembly work of the secondary battery 10 becomes easy.
  • the insulating cover 90 includes housing recesses 91f at both ends in the longitudinal direction of the insulating body 91a, and the protrusions 19 of the lid member 15 are inserted into the housing recesses 91f.
  • the protrusion 19 is a portion into which the rotation preventing portion 58 of the outer insulating member 57 enters in order to restrict the rotation of the outer insulating member 57 on the lid member 15. Therefore, while the secondary battery 10 includes the protrusion 19 that restricts the rotation of the outer insulating member 57 on the lid member 15, the protrusion 19 does not interfere with the mounting state of the insulating cover 90.
  • the insulating cover 90 is configured to integrally include the conductive member insulating portion 91, the terminal insulating portion 92, and the mechanism insulating portion 93. However, the conductive member insulating portion 91, the terminal insulating portion 92, and the mechanism insulating portion 93 are integrated. And may be separated.
  • the rib 92g of the terminal insulating part 92 and the rib 93g of the mechanism insulating part 93 may be eliminated, and the protruding dimension M1 and the protruding dimension M2 may be the same depending on the thickness of the terminal insulating part 92 and the mechanism insulating part 93 itself.
  • the insulating cover 90 may have a structure in which the conductive member insulating portion 91 does not exist and the terminal insulating portion 92 and the mechanism insulating portion 93 are integrated. In the insulating cover 90, if the mechanism insulating part 93 is separated along the facing direction Z so as not to contact the deformation plate 85 of the current interrupting mechanism 80, the relief recess 93f may be omitted.
  • the power storage device can also be applied to a secondary battery having a current interruption mechanism 80 integrated with the positive electrode lead terminal 60.
  • the mechanism insulating portion 93 is disposed between the positive electrode lead terminal 60 and the tab side end surface 12b of the electrode assembly 12, and the terminal insulating portion is disposed between the negative electrode lead terminal 61 and the tab side end surface 12b of the electrode assembly 12. 92 is arranged.
  • the positive electrode lead terminal 60 corresponds to the first electrode terminal
  • the negative electrode lead terminal 61 corresponds to the second electrode terminal.
  • the wall portion may be the side wall of the case member 14 instead of the lid member 15.
  • the electrode terminal may not be connected to the external connection terminal 66 via the terminal connection member 44 like the positive electrode lead terminal 60 or the negative electrode lead terminal 61, and may be connected to the positive electrode conductive member 51 or the negative electrode conductive member 52. It may be directly connected.
  • the power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors.
  • the positive electrode 21 and the negative electrode 31 may have a structure in which an active material layer is present on one side of a metal foil.
  • the secondary battery 10 may be a lithium ion secondary battery or another secondary battery. In short, any ion may be used as long as ions move between the active material for the positive electrode and the active material for the negative electrode and charge is transferred.
  • An electrode assembly in which electrodes of different polarities are laminated while being insulated from each other, a tab having a shape protruding from the electrode, and a tab group of each polarity protruding from an end surface of the electrode assembly;
  • a case accommodating the electrode assembly and the tab group; an external connection terminal disposed outside a wall portion of the case; and an end face of the electrode assembly and the wall portion, and the tab group.
  • a power storage device comprising: a terminal connection member that is disposed outside and connecting the lead terminal and the external connection terminal; and an insulating cover that is interposed between the pair of conductive members and the wall portion.
  • the external connection at the wall A portion that overlaps with the child is provided with a locking concave portion that prevents the engaging convex portion of the external connection terminal from rotating toward the insulating cover, and the insulating cover protrudes from the wall portion by the locking concave portion.
  • a power storage device comprising a housing recess for housing the battery.
  • the part which protruded from the wall part is a site
  • Electrode assembly 12b ... Tab side end surface, 15 ... Lid member as wall, 21 ... Positive electrode, 31 ... Negative electrode Electrode 51 ... Positive electrode conductive member 52 ... Negative electrode conductive member 60 ... Positive electrode extraction terminal as second electrode terminal 61 ... Negative electrode extraction terminal as first electrode terminal 80 ... Current interruption mechanism 85 ... Deformation plate 91 ... conductive member insulating part, 92 ... terminal insulating part, 93 ... mechanism insulating part.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)

Abstract

蓄電装置は、電極組立体と、電極組立体を収容したケースと、第１及び第２の電極端子と、第１の電極端子に電気的に接続される電流遮断機構とを備える。電流遮断機構は、ケースの内部圧力が設定圧力に達すると、電極端子と電極組立体との間の電気的な通電経路の電流を遮断する構造を有する。電流遮断機構は、電流遮断機構を含めた第１の電極端子と電極組立体の端面とを絶縁する機構絶縁部と、第２の電極端子と電極組立体の端面とを絶縁する端子絶縁部とを備える。壁部から第１の電極端子を含む機構絶縁部までの突出寸法と、壁部から第２の電極端子を含む端子絶縁部までの突出寸法とが同じである。

Description

蓄電装置
　本発明は、ケースの内部圧力が設定圧力に達すると、変形板の変形によって通電経路の電流を遮断する電流遮断機構を備える蓄電装置に関する。
　従来から、ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、としてリチウムイオン二次電池やニッケル水素二次電池などの蓄電装置が搭載されている。蓄電装置は、電動機などの電装品への供給電力を蓄える。一般的に、二次電池は、活物質層を有する正極電極及び負極電極が層状に重なった電極組立体と、該電極組立体を収容するケースとを備えている。ケースとしては、電極組立体を挿入するための開口部を有するケース部材と、ケース部材の開口部を閉塞する蓋部材とを有するものがある。正極電極及び負極電極の一辺からはタブが突設され、各タブには各極用の導電部材が接合されている。さらに、各導電部材には各極の電極端子が電気的に接続され、各電極端子は蓋部材に固定されている。
　また、二次電池は、ケースの内部圧力の上昇に対応して電流を遮断する電流遮断機構を備えたものがある。電流遮断機構は、一方の極性の電極端子と電極組立体とを電気的に接続している通電経路上に設けられている（例えば、特許文献１参照）。特許文献１の二次電池では、電流遮断機構は正極の電極端子と一体化されるとともに、蓋部材の内面と、この内面に対向した電極組立体の端面との間に画定された空間に配置されている。このような電流遮断機構は、タブを有する電極組立体を備えた二次電池においても電極端子と電極組立体との通電経路に設けることで適用可能である。
特開２０１２－１１９１８３号公報
　正極の電極端子及び負極の電極端子は互いに異なる材料からなる。そのため、正極の電極端子及び負極の電極端子は、互いに異なる電気抵抗及び強度を有する。したがって、両電極端子における電気抵抗及び強度の差を小さくしようとすると、両電極端子は互いに異なる形状や寸法を有するように形成される。その結果、正極の電極端子から電極組立体までの距離は、負極の電極端子から電極組立体までの距離と異なることになる。
　また、電流遮断装置を二次電池に適用する場合、何れか一方の電極端子に配置される。例えば、電流遮断装置が正極の電極端子に配置される場合、通電経路を構成する部材が電極組立体と正極の電極端子との間に位置する。該部材は、電極組立体に向かって突出する部分を有する。該部材における電極組立体に最も近接する部分から電極組立体までの距離は、負極の電極端子から電極組立体までの距離と異なる場合がある。電流遮断装置が負極の電極端子に配置される場合でも、電流遮断装置における電極組立体に最も近接する部分から電極組立体までの距離は、正極の電極端子から電極組立体までの距離と異なる場合がある。
　このため、二次電池が振動し、タブの変形によって電極組立体が蓋部材に近付いたときには、電極組立体の端面の一部が電流遮断機構に対し局所的に接触してしまう。
　本発明の目的は、電極組立体への局所的な接触を抑制できる蓄電装置を提供することにある。
　上記目的を達成するための蓄電装置は、異なる極性の電極が互いに絶縁されて積層された状態の電極組立体と、前記電極組立体を収容したケースと、同じ極性の前記電極と電気的にそれぞれ接続され、前記ケースの壁部に固定された第１及び第２の電極端子と、前記第１の電極端子と電気的に接続される電流遮断機構と、を備える。前記電流遮断機構は、前記ケースの内部圧力が設定圧力に達すると、前記電極端子と前記電極組立体との間の電気的な通電経路の電流を遮断する構造を有する。前記電流遮断機構は、前記電流遮断機構を含めた前記第１の電極端子と前記電極組立体の前記端面とを絶縁する機構絶縁部と、前記第２の電極端子と前記電極組立体の前記端面とを絶縁する端子絶縁部とを備える。前記壁部から前記第１の電極端子を含む前記機構絶縁部までの突出寸法と、前記壁部から前記第２の電極端子を含む前記端子絶縁部までの突出寸法とが同じである。
　これによれば、機構絶縁部により、電流遮断機構と電極組立体とを絶縁することができ、端子絶縁部により、電流遮断機構の存在しない第２の電極端子と電極組立体とを絶縁することができる。そして、壁部から機構絶縁部に至るまでの突出寸法と、壁部から端子絶縁部に至るまでの突出寸法が同じであることから、蓄電装置が外力を受けたり、振動したりして、電極組立体が壁部に近付いても、電極組立体の端面には、機構絶縁部及び端子絶縁部が同じように接触し、しかも接触面積を広く確保でき、電極組立体の端面に対し電流遮断機構が局所的に接触してしまうことを抑制できる。
　また、蓄電装置について、同じ極性の前記電極と前記電極端子とを接続し、前記壁部と前記端面との間に配置された一対の導電部材を備えるとともに、一対の前記導電部材と前記壁部とを絶縁する導電部材絶縁部を備え、前記端子絶縁部及び前記機構絶縁部は、前記導電部材絶縁部と一体であってもよい。
　これによれば、導電部材絶縁部と端子絶縁部と機構絶縁部が一体化されているため、導電部材の絶縁用の部品と、電流遮断機構の絶縁用の部品と、電極端子の絶縁用の部品とを別体とする場合と比べると、蓄電装置の部品点数を減らし、組立を容易にすることができる。
　また、前記電流遮断機構は、一面に前記ケースの内部圧力が作用し、他面に前記ケースの外部圧力が作用する変形板を備え、かつ前記第１の電極端子と前記電極組立体との電気的な通電経路の一部を構成するとともに、前記電極組立体の端面と前記第１の電極端子との間に配置されてもよい。
　蓄電装置は二次電池である。
　本発明によれば、電極組立体への局所的な接触を抑制できる。
実施形態の二次電池を示す斜視図。 実施形態の二次電池を示す部分破断正面図。 実施形態の二次電池を示す分解斜視図。 実施形態の二次電池を示す部分断面図。 絶縁カバーを示す斜視図。 （ａ）は絶縁カバーの装着状態を示す図４の６ａ－６ａ線断面図、（ｂ）は絶縁カバーの装着状態を示す図４の６ｂ－６ｂ線断面図。 絶縁カバーの装着状態を示す斜視図。 外部接続端子付近を示す図４の８－８線断面図。 電極組立体と絶縁カバーとの接触状態を示す断面図。
　以下、蓄電装置を二次電池に具体化した一実施形態を図１～図９にしたがって説明する。
　図１又は図３に示すように、蓄電装置としての二次電池１０はケース１１を備え、ケース１１には電極組立体１２が収容されている。ケース１１は、四角箱状のケース部材１４と、このケース部材１４の開口部１４ａを閉塞する矩形平板状の壁部としての蓋部材１５とを有している。なお、本実施形態の二次電池１０はリチウムイオン電池である。
　電極組立体１２は、シート状の複数の正極電極２１とシート状の複数の負極電極３１とを備え、正極電極２１と負極電極３１とは異なる極性の電極である。詳細に図示しないが、正極電極２１は、正極金属箔（本実施形態ではアルミニウム箔）と、その正極金属箔の両面に存在する正極活物質層とを有する。負極電極３１は、負極金属箔（本実施形態では銅箔）と、その負極金属箔の両面に存在する負極活物質層とを有する。そして、電極組立体１２は、複数の正極電極２１と複数の負極電極３１の間にこれらを絶縁するセパレータ２４を介在させて層状とした積層型である。
　正極電極２１は、正極電極２１の一辺２１ａの一部から突出した形状のタブ２５を有する。負極電極３１は、負極電極３１の一辺３１ａの一部から突出した形状のタブ３５を有する。複数の正極のタブ２５、及び複数の負極のタブ３５は、正極電極２１及び負極電極３１が積層された状態で、正極のタブ２５と負極のタブ３５とが重ならない位置にそれぞれ設けられている。電極組立体１２は、正極電極２１の一辺２１ａ、負極電極３１の一辺３１ａ、及びセパレータ２４の一辺を寄せ集めて形成されたタブ側端面１２ｂを有する。電極組立体１２を構成する各正極電極２１は、それぞれのタブ２５が積層方向に沿って列状に配置されるように積層される。同様に、電極組立体１２を構成する各負極電極３１は、それぞれのタブ３５が積層方向に沿って列状に配置されるように積層される。
　二次電池１０は、タブ側端面１２ｂから突出した正極のタブ群３６を有し、このタブ群３６は、全ての正極のタブ２５を電極組立体１２における積層方向の一側に寄せ集め、積層して構成されている。また、二次電池１０は、タブ側端面１２ｂから突出した負極のタブ群３６を有し、このタブ群３６は、全ての負極のタブ３５を電極組立体１２における積層方向の一側に寄せ集め、積層して構成されている。そして、二次電池１０では、ケース１１に収容された各タブ群３６、及び電極組立体１２のタブ側端面１２ｂに対し、ケース１１の壁部としての蓋部材１５の内面が対峙している。蓋部材１５の内面と、電極組立体１２のタブ側端面１２ｂとを最短距離で結ぶ方向を対向方向Ｚとする。
　図３又は図４に示すように、正極のタブ群３６には、電極組立体１２と、後述の正極端子構造１６とを電気的に接続するための正極導電部材５１が接合されている。また、負極のタブ群３６には、電極組立体１２と、後述の負極端子構造１７とを電気的に接続するための負極導電部材５２が接合されている。蓋部材１５の内面と電極組立体１２のタブ側端面１２ｂとの間には、正極導電部材５１及び負極導電部材５２が配置されている。
　正極導電部材５１は、タブ群３６と接合され略Ｕ字状のタブ接合部５１ａを長手方向一側に備える。また、正極導電部材５１は、後述の正極引出端子６０と接続される平板状の端子接続部５１ｂを長手方向他側に備え、タブ接合部５１ａと端子接続部５１ｂは長手方向に連続している。
　負極導電部材５２は、タブ群３６と電気的に接合された略Ｕ字状のタブ接合部５２ａを長手方向一側に備える。また、負極導電部材５２は、後述の負極引出端子６１と電気的に接合された端子接続部５２ｂを長手方向他側に備え、タブ接合部５２ａと端子接続部５２ｂは長手方向に連続している。
　次に、正極端子構造１６及び負極端子構造１７を説明する。なお、正極端子構造１６と負極端子構造１７は、電流遮断機構を除いて基本的に同じ構成であるため、共通の部材については、同じ部材番号を使用して説明する。
　まず、正極端子構造１６及び負極端子構造１７を設けるための蓋部材１５の構成について説明する。蓋部材１５は、ケース１１の外側に臨む外面１５ｃ及びケース１１の内側に臨む内面１５ｄを有し、蓋部材１５において、外面１５ｃと内面１５ｄを最短距離で結ぶ方向を厚み方向とする。
　蓋部材１５は、長手方向における両側に係止凹部１８を備える。各係止凹部１８は、外面１５ｃから厚み方向に沿って凹んだ形状である。蓋部材１５を外面１５ｃから見て、係止凹部１８の外形は四角形状である。蓋部材１５は、内面１５ｄから突出した突部１９を備える。突部１９は、係止凹部１８を凹ませることで内面１５ｄから突出した形状となっており、突部１９の外形は四角形状である。蓋部材１５は、長手方向における各係止凹部１８より外側に挿通孔１５ｅを備える。
　正極端子構造１６及び負極端子構造１７は、蓋部材１５の外面１５ｃに配置された外側絶縁部材５７を備える。この外側絶縁部材５７は、正極の外部接続端子６６及び正極引出端子６０と蓋部材１５を絶縁し、負極の外部接続端子６６及び負極引出端子６１と蓋部材１５とを絶縁する。外側絶縁部材５７は合成樹脂製である。外側絶縁部材５７は、蓋部材１５の外面１５ｃから見て矩形状である。外側絶縁部材５７の表面５７ｃと裏面５７ａとを結ぶ方向を厚み方向とする。
　外側絶縁部材５７は、長手方向の一端寄りに、裏面５７ａから厚み方向に突出した回り止め部５８を備える。回り止め部５８は、表面５７ｃから裏面５７ａに向けて四角孔状に突出した形状である。回り止め部５８の四つの外側面を結んで形成される四角形状は、蓋部材１５の係止凹部１８の四つの内側面を結んで形成される四角形状と相似である。そして、外側絶縁部材５７は、回り止め部５８が係止凹部１８に挿入された状態で蓋部材１５に設置されている。回り止め部５８の四つの外側面は、係止凹部１８の四つの内側面に接触し、係止している。この接触により、外側絶縁部材５７は、蓋部材１５の外面１５ｃに沿う方向への移動が規制され、特に、外面１５ｃ上での回転が規制されている。外側絶縁部材５７は、長手方向において回り止め部５８と反対側の端部寄りに挿通孔５７ｄを備える。挿通孔５７ｄは、蓋部材１５の挿通孔１５ｅと一致した位置にある。
　正極端子構造１６及び負極端子構造１７は、蓋部材１５の外側に配置された外部接続端子６６を備え、この外部接続端子６６は蓋部材１５の外側でバスバーを固定可能とする。外部接続端子６６は金属製である。この外部接続端子６６は、角柱状のボルト頭部６７と、外部接続端子６６の軸方向に沿ってボルト頭部６７の一端面から突出した形状の軸部６８と、ボルト頭部６７の他端面から突出した形状の係合凸部６９とを、備える。軸部６８には、バスバー締結用のナットが螺合可能である。
　係合凸部６９は軸方向に見て四角形状である。係合凸部６９の四つの外側面を結んで形成される四角形状は、外側絶縁部材５７の回り止め部５８の四つの内側面を結んで形成される四角形状と相似である。そして、外部接続端子６６の係合凸部６９は、外側絶縁部材５７の回り止め部５８内に挿入されている。係合凸部６９の四つの外側面は、回り止め部５８の四つの内側面に接触している。この接触により、外部接続端子６６は、外側絶縁部材５７の表面５７ｃに沿う方向への移動が規制され、特に、外側絶縁部材５７の表面５７ｃでの回転が規制されている。
　正極端子構造１６は、電極組立体１２の正極のタブ群３６と正極導電部材５１を介して電気的に接続された電極端子としての正極引出端子６０を備える。負極端子構造１７は、電極組立体１２の負極のタブ群３６と負極導電部材５２を介して電気的に接続された電極端子としての負極引出端子６１を備える。
　正極引出端子６０は、後述の端子接続部材４４と電気的に接続される接続用軸部６０ａと、正極導電部材５１の端子接続部５１ｂと電気的に接続される基部６０ｂとを軸方向に連続して備える。なお、端子接続部材４４は、長手方向の一側に、外部接続端子６６と接続される接続片４６を備え、長手方向の他側に固定片４７を備える。端子接続部材４４は、接続片４６を厚み方向に貫通する貫通孔４６ａを備え、この貫通孔４６ａには外部接続端子６６の軸部６８が挿通されている。また、端子接続部材４４は、固定片４７を厚み方向に貫通する挿通孔４７ａを備える。
　そして、正極引出端子６０の基部６０ｂは、蓋部材１５の内面１５ｄからケース１１内に突出して配置されているとともに、接続用軸部６０ａは、正極導電部材５１の挿通孔５１ｃ、後述する内側絶縁部材４０の挿通孔４０ａ、蓋部材１５の挿通孔１５ｅ、外側絶縁部材５７の挿通孔５７ｄ及び端子接続部材４４の挿通孔４７ａを貫通している。
　正極端子構造１６は、Ｏリング７３を備え、このＯリング７３には、正極引出端子６０の接続用軸部６０ａが挿通されているとともに、Ｏリング７３は正極導電部材５１の端子接続部５１ｂに支持されている。また、正極端子構造１６は、接続用軸部６０ａが挿通された前述の内側絶縁部材４０を有する。内側絶縁部材４０は、四角板状である。蓋部材１５の短手方向に沿う内側絶縁部材４０の寸法は、同じく蓋部材１５の短手方向に沿う正極導電部材５１の寸法より大きい。このため、内側絶縁部材４０は、蓋部材１５の短手方向に沿って正極導電部材５１よりも突出している。
　図４に示すように、内側絶縁部材４０の内側には、端子接続部５１ｂに支持されたＯリング７３が配置されている。そして、内側絶縁部材４０は、蓋部材１５と、端子接続部５１ｂとの間に介在し、蓋部材１５と端子接続部５１ｂの接触を規制するとともに、蓋部材１５と正極導電部材５１とを絶縁する。
　端子接続部材４４の挿通孔４７ａを貫通した接続用軸部６０ａの先端部が軸方向にかしめられることにより、接続用軸部６０ａと基部６０ｂによって、正極導電部材５１、内側絶縁部材４０、蓋部材１５、外側絶縁部材５７、及び端子接続部材４４の固定片４７が挟持されている。この挟持により、正極引出端子６０が蓋部材１５に固定されている。Ｏリング７３は、蓋部材１５の内面１５ｄのうち挿通孔１５ｅの周囲に密接し、蓋部材１５の挿通孔１５ｅをシールしている。
　また、正極引出端子６０の接続用軸部６０ａの先端部は、端子接続部材４４における固定片４７の表面に係止するとともに、この係止によって正極引出端子６０と端子接続部材４４が電気的に接続されている。また、正極引出端子６０の基部６０ｂは、正極導電部材５１の端子接続部５１ｂに接触し、この接触によって、正極引出端子６０と正極導電部材５１が電気的に接続されている。
　負極端子構造１７において、負極引出端子６１は、負極の端子接続部材４４と電気的に接続される接続用軸部６２と、負極導電部材５２の端子接続部５２ｂと電気的に接続される基部６３とを軸方向に連続して備える。負極引出端子６１の接続用軸部６２は、内側絶縁部材４０の挿通孔４０ａ、蓋部材１５の挿通孔１５ｅ、外側絶縁部材５７の挿通孔５７ｄ及び端子接続部材４４の挿通孔４７ａに挿通されている。
　負極引出端子６１の基部６３は、四角柱状である。基部６３の外形形状は、負極引出端子６１を軸方向から見て四角形状である。負極引出端子６１は、軸方向に貫通する軸孔６４を備え、軸孔６４は、接続用軸部６２及び基部６３を貫通している。また、負極引出端子６１は、その基部６３における電極組立体１２のタブ側端面１２ｂに対峙する端面に端子端面６３ｂを備えるとともに、端子端面６３ｂよりも接続用軸部６２に向けて凹む凹部６３ｃを備える。凹部６３ｃは、軸孔６４に連通している。また、端子端面６３ｂは、凹部６３ｃを取り囲む環状である。
　負極端子構造１７は、Ｏリング７３を有し、このＯリング７３には接続用軸部６２が挿通されるとともに、Ｏリング７３は基部６３に支持されている。負極端子構造１７は、接続用軸部６２が挿通された筒状の内側絶縁部材４０を有する。内側絶縁部材４０の内側には、基部６３に支持されたＯリング７３が配置されている。そして、内側絶縁部材４０は、蓋部材１５と、負極引出端子６１の基部６３との間に介在し、蓋部材１５と基部６３との接触を規制するとともに、蓋部材１５と負極引出端子６１とを絶縁する。また、負極の内側絶縁部材４０は、基部６３の外周面を覆い、ケース１１から負極引出端子６１を絶縁する。
　負極端子構造１７において、端子接続部材４４の挿通孔４７ａを貫通した接続用軸部６２の先端部が軸方向にかしめられることにより、接続用軸部６２と基部６３によって、内側絶縁部材４０、蓋部材１５、外側絶縁部材５７、及び端子接続部材４４が挟持されている。この挟持により、負極引出端子６１が蓋部材１５に固定されている。Ｏリング７３は、蓋部材１５の内面１５ｄのうち挿通孔１５ｅの周囲に密接し、蓋部材１５の挿通孔１５ｅをシールしている。
　また、負極引出端子６１の接続用軸部６２の先端部は、端子接続部材４４における固定片４７の表面に係止するとともに、この係止によって負極引出端子６１と端子接続部材４４が電気的に接続されている。
　二次電池１０は、第１の電極端子としての負極引出端子６１に電気的に接続された電流遮断機構８０を備える。なお、上記の正極引出端子６０は第２の電極端子となる。電流遮断機構８０は、ケース１１の内部に配置されており、ケース１１の内部圧力が所定の設定圧力に達すると、電極組立体１２と、負極引出端子６１とを電気的に接続している通電経路の電流を遮断する。電流遮断機構８０は、負極引出端子６１の基部６３と、負極導電部材５２の端子接続部５２ｂの接続部に位置している。電流遮断機構８０は、負極引出端子６１に一体に組み込まれている。
　この実施形態では、負極引出端子６１の基部６３が電流遮断機構８０を介して負極導電部材５２に電気的に接続されるとともに、負極導電部材５２が負極のタブ群３６に電気的に接続されることにより、電極組立体１２と、負極引出端子６１との間の通電経路が構成されている。
　電流遮断機構８０は、ケース１１の内部に発生したガスによって作動すると、負極引出端子６１の基部６３と負極導電部材５２との電気的な接続を遮断する。つまり、電流遮断機構８０は、作動していないときには上記通電経路の一部を構成し、ケース１１の内部に発生したガスの圧力を受けて作動したときに上記通電経路を遮断する。
　電流遮断機構８０は、負極導電部材５２の端子接続部５２ｂと基部６３とに接合された接点板８１を有する。接点板８１は、導電性の材料製であり、電極組立体１２に向けて凸となる碗状である。そして、接点板８１は、基部６３の凹部６３ｃを電極組立体１２側から覆っている。接点板８１における凹部６３ｃからはみ出している外周部と、基部６３の端子端面６３ｂとは、溶接により固定されている。
　接点板８１における凹部６３ｃと対向する部分は、通常状態において電極組立体１２（下方）に向けて凸となっており、この電極組立体１２に向けて凸となった部分と、負極導電部材５２の端子接続部５２ｂとが溶接されている。接点板８１と端子接続部５２ｂとの溶接部分である負極溶接部分Ｐを、負極引出端子６１と負極導電部材５２とを導通する導通部とする。よって、負極導電部材５２と負極引出端子６１とは、接点板８１を介して電気的に接続されている。電流遮断機構８０は、基部６３と負極導電部材５２との間に配置された絶縁リング８２、及び絶縁リング８２の外周側に配置されたシールリング８３を有する。
　負極導電部材５２は、端子接続部５２ｂの電極組立体１２と対向する面に変形用凹部５３ａを有する。変形用凹部５３ａは、電極組立体１２から蓋部材１５に向けてすり鉢状に凹んでいる。変形用凹部５３ａの底面に負極溶接部分Ｐが位置している。端子接続部５２ｂは、変形用凹部５３ａの底面となる部位に図示しない破断溝を有する。破断溝は負極溶接部分Ｐを取り囲む円環状である。
　電流遮断機構８０は、ケース１１の内部圧力を受圧して変形する変形板８５を有する。変形板８５は、弾性材料、例えば金属板で構成されたダイヤフラムであり、端子接続部５２ｂより電極組立体１２に近い位置に配置されている。変形板８５は、円板形状であって変形用凹部５３ａを電極組立体１２側から覆っている。変形板８５の外周部と端子接続部５２ｂとが変形板８５の外周部の全周にわたって溶接固定されている。変形板８５は、ケース１１内部をケース１１外部に対して気密に隔てている。
　変形板８５は、通常状態において蓋部材１５側から電極組立体１２側（下方）に向けて凸となっており、この凸部分における負極溶接部分Ｐと対向する箇所には、蓋部材１５に向けて突出した突起８５ａを有する。突起８５ａは、絶縁性の材料により構成されており、破断溝で囲まれた負極溶接部分Ｐと対向している。
　変形板８５の一面（電極組立体１２と対向する面）には、ケース１１の内部圧力が作用している。また、変形板８５の他面（蓋部材１５と対向する面）には、負極引出端子６１の軸孔６４を介してケース１１の外部圧力（略大気圧）が作用している。そして、変形板８５は、電極組立体１２と対向する面に、設定圧力に達した内部圧力が付与された場合に、圧力によって変形して蓋部材１５に向けて凸となるように構成されている。
　そして、上記構成の電流遮断機構８０においては、ケース１１の内部圧力が所定の設定圧力に達すると、変形板８５が蓋部材１５に向けて変形し、突起８５ａが、端子接続部５２ｂと接点板８１との負極溶接部分Ｐを破断する。その結果、負極引出端子６１と負極導電部材５２との電気的な接続が遮断され、上記通電経路の電流が遮断される。
　次に、ケース１１内の絶縁カバー９０について説明する。
　図４に示すように、絶縁カバー９０は、対向方向Ｚにおいて正極導電部材５１及び負極導電部材５２と蓋部材１５との間に介在する導電部材絶縁部９１を備える。また、絶縁カバー９０は、電流遮断機構８０を含めた負極引出端子６１と、電極組立体１２のタブ側端面１２ｂとを絶縁する機構絶縁部９３と、正極引出端子６０と電極組立体１２のタブ側端面１２ｂとを絶縁する端子絶縁部９２とを備える。そして、絶縁カバー９０は長手方向に沿う側面視略Ｕ字状である。
　図５に示すように、機構絶縁部９３は、矩形状の導電部材絶縁部９１の長手方向の一端部に一体であり、端子絶縁部９２は、導電部材絶縁部９１の長手方向の他端部に一体である。即ち、導電部材絶縁部９１、端子絶縁部９２及び機構絶縁部９３は単一の部材からなる。導電部材絶縁部９１は、長手方向に沿って見た側面視でＬ字状であり、絶縁部本体９１ａと、絶縁部本体９１ａの一つの長縁部から電極組立体１２に向けて突出した形状の側壁部９１ｂを備える。
　図４に示すように、二次電池１０において、正極導電部材５１と負極導電部材５２が並ぶ方向を並設方向とすると、絶縁カバー９０の長手方向が並設方向に沿う。並設方向に沿って一対の内側絶縁部材４０の対向面同士を結ぶ直線の寸法を寸法Ｎとする。絶縁カバー９０において、導電部材絶縁部９１の長手方向への寸法は、上記寸法Ｎより僅かに長い。このため、導電部材絶縁部９１の長手方向の両端面のうち、一端面は正極の内側絶縁部材４０の内側面に当接可能であり、他端面は負極の内側絶縁部材４０の内側面に当接可能な位置にある。導電部材絶縁部９１の短手方向への寸法は、タブ接合部５１ａ，５２ａの短手方向への寸法より若干長い。
　そして、導電部材絶縁部９１の絶縁部本体９１ａは、対向方向Ｚにおける正極及び負極のタブ接合部５１ａ，５２ａと、蓋部材１５との間に介在し、タブ接合部５１ａ，５２ａと蓋部材１５とを絶縁する。また、導電部材絶縁部９１の側壁部９１ｂは、各タブ群３６とケース部材１４の長側壁の内面との間に介在し、各タブ群３６とケース部材１４とを絶縁する。
　図８に示すように、絶縁カバー９０は、絶縁部本体９１ａの長手方向両端部に収容凹部９１ｆを備える。収容凹部９１ｆは、絶縁部本体９１ａの外面９１ｃから電極組立体１２に向けて四角形状に凹む形状である。そして、各収容凹部９１ｆには、蓋部材１５の突部１９が入り込んでおり、突部１９の外側面と収容凹部９１ｆの内側面との接触により、絶縁カバー９０の長手方向及び短手方向に沿った絶縁カバー９０の移動が規制されている。
　図５に示すように、絶縁カバー９０は、導電部材絶縁部９１における側壁部９１ｂの長手方向両端部で、かつ短手方向の一端部に一体の連結部９４を備える。そして、長手方向一端の連結部９４に機構絶縁部９３が連結され、側壁部９１ｂの長手方向他端の連結部９４に端子絶縁部９２が連結されている。長手方向に沿う側面視では、絶縁部本体９１ａと端子絶縁部９２、及び絶縁部本体９１ａと機構絶縁部９３とは、連結部９４によって、対向方向Ｚに離間している。
　図４に示すように、絶縁カバー９０において、絶縁部本体９１ａは、電極組立体１２のタブ側端面１２ｂに対峙する面に内面９１ｄを備える。端子絶縁部９２は、蓋部材１５の外面１５ｃから見た平面視が四角形状である。端子絶縁部９２の平面視サイズは、正極引出端子６０の基部６０ｂの平面視サイズより大きく、基部６０ｂの全体を電極組立体１２側から覆うことができる。
　端子絶縁部９２は、正極引出端子６０の基部６０ｂに対峙する内面９２ｂを備えるとともに、電極組立体１２のタブ側端面１２ｂに対峙する外面９２ｄを備え、外面９２ｄは平坦面状である。端子絶縁部９２は、内面９２ｂのうち、絶縁部本体９１ａ寄りに突条部９２ｅを備え、突条部９２ｅは絶縁カバー９０の短手方向全体に亘って存在する。また、突条部９２ｅは、絶縁部本体９１ａよりも端子絶縁部９２寄りに位置し、対向方向Ｚにおいて絶縁部本体９１ａと突条部９２ｅは重なり合っておらず、長手方向に位置ずれしている。
　ただし、長手方向に沿う側面視では、絶縁部本体９１ａと突条部９２ｅとは対向方向Ｚに対向した位置にある。よって、絶縁カバー９０は、対向方向Ｚにおいて絶縁部本体９１ａと突条部９２ｅとの間に正極側隙間９５ａを備え、この正極側隙間９５ａは、絶縁カバー９０の短手方向における連結部９４と反対側の端部に開口する。対向方向Ｚに沿う正極側隙間９５ａの寸法は、正極導電部材５１の厚みより大きく、正極側隙間９５ａには、端子接続部５１ｂが挿入されている。また、端子絶縁部９２は、絶縁カバー９０の長手方向の先端部となる位置にリブ９２ｇを備える。リブ９２ｇは絶縁カバー９０の短手方向全体に亘って存在する。
　そして、正極導電部材５１のタブ接合部５１ａに絶縁カバー９０の絶縁部本体９１ａが支持されるとともに、対向方向Ｚに沿うタブ接合部５１ａと蓋部材１５との間に絶縁部本体９１ａが挟まれている。
　絶縁カバー９０の短手方向に沿う両端部のうち、突条部９２ｅの一端部に連結部９４が位置し、他端部に係止爪９２ａが存在する。端子絶縁部９２の係止爪９２ａは、突条部９２ｅから対向方向Ｚに突出している。絶縁カバー９０の短手方向に沿う連結部９４と突条部９２ｅの対向面間の寸法は、短手方向に沿う正極導電部材５１の寸法より大きく、正極の内側絶縁部材４０の寸法より僅かに長い。そして、正極側隙間９５ａ内に端子接続部５１ｂが入り込んだ状態では、絶縁カバー９０の短手方向に対向した内側絶縁部材４０の縁部の一方に連結部９４が当接するとともに、図６（ｂ）に示すように、他方の縁部に係止爪９２ａが係止している。加えて、図２に示すように、対向方向Ｚに沿うリブ９２ｇの先端面は、内側絶縁部材４０における電極組立体１２と対向する面に当接している。
　また、機構絶縁部９３は、蓋部材１５の外面１５ｃから見た平面視が四角形状である。機構絶縁部９３の平面視サイズは、負極引出端子６１の基部６３及び電流遮断機構８０の平面視サイズとほぼ同じであり、電流遮断機構８０の全体を電極組立体１２側から覆うことができる。
　図４に示すように、機構絶縁部９３は、電流遮断機構８０の変形板８５に対峙する内面９３ｂを備えるとともに、電極組立体１２に対峙する外面９３ｄを備え、外面９３ｄは平坦面状である。機構絶縁部９３は、内面９３ｂのうち、絶縁部本体９１ａ寄りに突条部９３ｅを備え、突条部９３ｅは絶縁カバー９０の短手方向全体に亘って存在する。対向方向Ｚにおいて絶縁部本体９１ａと突条部９３ｅは重なり合った位置にある。
　絶縁カバー９０は、対向方向Ｚにおいて絶縁部本体９１ａと突条部９３ｅとの間に負極側隙間９５ｂを備え、この負極側隙間９５ｂは、絶縁カバー９０の短手方向における連結部９４と反対側の端部に開口する。対向方向Ｚに沿う負極側隙間９５ｂの寸法は、負極導電部材５２のタブ接合部５２ａの厚みより大きく、負極側隙間９５ｂには、負極のタブ接合部５２ａが挿入されている。そして、タブ接合部５２ａに絶縁カバー９０の絶縁部本体９１ａが支持されるとともに、対向方向Ｚに沿うタブ接合部５２ａと蓋部材１５との間に絶縁部本体９１ａが挟まれている。
　また、図５に示すように、機構絶縁部９３は、内面９３ｂの縁部に沿ってリブ９３ｇを備え、このリブ９３ｇは平面視Ｌ字状である。
　ここで、図２に示すように、端子絶縁部９２の外面９２ｄからリブ９２ｇの先端面に至るまでの寸法を高さＨ１とし、機構絶縁部９３の外面９３ｄからリブ９３ｇの先端面に至るまでの寸法を高さＨ２とする。端子絶縁部９２のリブ９２ｇの高さＨ１は、機構絶縁部９３のリブ９３ｇの高さＨ２より高い。
　図６（ａ）に示すように、絶縁カバー９０の短手方向に沿う両端部のうち、負極側の突条部９３ｅの一端部に連結部９４が位置し、他端部に係止爪９３ａが存在する。機構絶縁部９３の係止爪９３ａは、突条部９３ｅから対向方向Ｚに突出している。絶縁カバー９０の短手方向に沿う連結部９４と突条部９３ｅの対向面間の寸法は、タブ接合部５２ａの短手方向に沿う寸法より僅かに大きい。そして、負極側隙間９５ｂ内にタブ接合部５２ａが入り込んだ状態では、絶縁カバー９０の短手方向に対向したタブ接合部５２ａの縁部の一方に連結部９４が当接するとともに、他方の縁部に係止爪９３ａが係止している。加えて、図２に示すように、対向方向Ｚに沿うリブ９３ｇの先端面は、端子接続部５２ｂにおける電極組立体１２と対向する面に当接している。
　また、図４又は図５に示すように、機構絶縁部９３は、中央部に厚み方向に貫通した逃がし凹部９３ｆを備え、この逃がし凹部９３ｆには、電流遮断機構８０の変形板８５が入り込んでいる。そして、変形板８５の下面（電極組立体１２と対向する面）には、逃がし凹部９３ｆを介してケース１１の内部圧力が作用している。
　図２に示すように、機構絶縁部９３において、外面９３ｄからリブ９３ｇの先端面までの高さＨ２は、端子絶縁部９２において、外面９２ｄからリブ９２ｇの先端面までの高さＨ１より低い。これに対し、対向方向Ｚに沿って、蓋部材１５の内面１５ｄから正極引出端子６０の基部６０ｂまでの寸法Ｌ１は、蓋部材１５の内面１５ｄから電流遮断機構８０を含む端子接続部５２ｂまでの寸法Ｌ２よりは小さい。そして、機構絶縁部９３のリブ９３ｇは、端子接続部５２ｂに当接し、端子絶縁部９２のリブ９２ｇは、正極導電部材５１の端子接続部５１ｂに当接している。
　蓋部材１５の内面１５ｄから端子絶縁部９２の外面９２ｄまでの寸法を正極端子構造１６の突出寸法Ｍ１とする。蓋部材１５の内面１５ｄから機構絶縁部９３の外面９３ｄまでの寸法を負極端子構造１７の突出寸法Ｍ２とする。この場合、負極端子構造１７での突出寸法Ｍ２と、正極端子構造１６での突出寸法Ｍ１は同じである。また、端子絶縁部９２の外面９２ｄと電極組立体１２のタブ側端面１２ｂとの間の間隔は、機構絶縁部９３の外面９３ｄと電極組立体１２のタブ側端面１２ｂとの間の間隔と同じである。端子絶縁部９２の外面９２ｄは、機構絶縁部９３の外面９３ｄと面一である。
　正極端子構造１６では、電流遮断機構８０が正極引出端子６０の基部６０ｂには一体化されていないが、負極端子構造１７では、電流遮断機構８０が負極引出端子６１の基部６３に一体化されている。このため、負極端子構造１７の方が、蓋部材１５から電極組立体１２に向けて突出し、負極端子構造１７の寸法Ｌ２が、正極端子構造１６の寸法Ｌ１より大きい。しかし、絶縁カバー９０では、機構絶縁部９３の高さＨ２を端子絶縁部９２の高さＨ１より低くし、蓋部材１５からの正極端子構造１６及び負極端子構造１７の突出寸法の差を絶縁カバー９０の形状により補っている。その結果、絶縁カバー９０により、電流遮断機構８０を電極組立体１２側から覆いつつも、機構絶縁部９３の外面９３ｄと、端子絶縁部９２の外面９２ｄとが面一になっている。
　次に、二次電池１０の製造方法を記載する。
　なお、負極の負極引出端子６１の端子端面６３ｂには接点板８１が接合され、接点板８１、絶縁リング８２、シールリング８３、及び負極導電部材５２（端子接続部５２ｂ）がユニット化されているものとする。また、負極導電部材５２の端子接続部５２ｂには変形板８５が接合されており、負極引出端子６１と電流遮断機構８０と負極導電部材５２が予め一体化されているとする。
　まず、蓋部材１５の各係止凹部１８に外側絶縁部材５７の回り止め部５８を挿入した状態で蓋部材１５の外面１５ｃに外側絶縁部材５７を配置する。その外側絶縁部材５７の回り止め部５８内に外部接続端子６６の係合凸部６９が挿入される。端子接続部材４４の貫通孔４６ａに外部接続端子６６の軸部６８を挿入する。
　次に、正極側において、蓋部材１５の内面１５ｄ側にＯリング７３、内側絶縁部材４０を配置するとともに正極導電部材５１を配置し、正極引出端子６０の接続用軸部６２を正極導電部材５１の挿通孔５１ｃ、内側絶縁部材４０の挿通孔４０ａ、Ｏリング７３、蓋部材１５の挿通孔１５ｅ及び端子接続部材４４の挿通孔４７ａに挿入する。そして、正極引出端子６０の接続用軸部６０ａのかしめにより、基部６０ｂと接続用軸部６０ａの先端部との間に、正極導電部材５１、内側絶縁部材４０、蓋部材１５、外側絶縁部材５７、及び端子接続部材４４が一体化される。
　負極側において、蓋部材１５の内面１５ｄ側にＯリング７３、内側絶縁部材４０を配置し、内側絶縁部材４０の挿通孔４０ａ、Ｏリング７３、蓋部材１５の挿通孔１５ｅ及び端子接続部材４４の挿通孔４７ａに、負極引出端子６１の接続用軸部６２を挿入する。そして、接続用軸部６２のかしめにより、基部６３と接続用軸部６２の先端部との間に、内側絶縁部材４０、蓋部材１５、外側絶縁部材５７、及び端子接続部材４４が一体化されるとともに、電流遮断機構８０も一体化される。
　すると、蓋部材１５に正極端子構造１６及び負極端子構造１７が形成され、蓋端子組立体２０が形成される。蓋端子組立体２０では、外側絶縁部材５７の回り止め部５８の外側面と、蓋部材１５の係止凹部１８の内側面との係止により、外側絶縁部材５７の蓋部材１５上での回転が規制される。この回転の規制された外側絶縁部材５７の回り止め部５８の内側面と外部接続端子６６の係合凸部６９の外側面との係止により、外部接続端子６６の回転が規制される。
　蓋端子組立体２０では、対向方向Ｚにおける蓋部材１５とタブ接合部５１ａ，５２ａとの間に隙間が存在している。また、タブ接合部５１ａ，５２ａはＬ字状にあり、タブ接合部５１ａ，５２ａは蓋部材１５から突出する部分が存在する。
　そして、正極導電部材５１のタブ接合部５１ａに対し、電極組立体１２の正極のタブ群３６がレーザ溶接によって接合され、負極導電部材５２のタブ接合部５２ａに対し、負極のタブ群３６がレーザ溶接によって接合される。すると、蓋端子組立体２０と電極組立体１２が一体化される。
　次に、各タブ接合部５１ａ，５２ａを略Ｕ字状に折り曲げ、タブ群３６を折り曲げる。そして、図７に示すように、対向方向Ｚにおける蓋部材１５とタブ接合部５１ａ，５２ａとの間に、絶縁カバー９０の絶縁部本体９１ａを差し込むとともに、正極側隙間９５ａに正極導電部材５１を、負極側隙間９５ｂに負極導電部材５２を差し込むように、絶縁カバー９０をスライド移動させる。
　そして、正極側において、連結部９４が内側絶縁部材４０の一縁部に当接すると、端子絶縁部９２の係止爪９２ａが内側絶縁部材４０の縁部に係止する。また、負極側において、連結部９４がタブ接合部５２ａの一長縁部に当接すると、機構絶縁部９３の係止爪９３ａがタブ接合部５２ａの他長縁部に係止する。その結果、絶縁カバー９０が正極導電部材５１及び負極導電部材５２に一体に組付けられるとともに、タブ接合部５１ａ，５２ａが絶縁部本体９１ａによって、蓋部材１５から絶縁された状態となる。
　また、端子絶縁部９２が正極引出端子６０の基部６０ｂを電極組立体１２から絶縁し、機構絶縁部９３が電流遮断機構８０を電極組立体１２から絶縁しつつ、変形板８５を保護した状態となる。
　そして、電極組立体１２をケース部材１４の開口部１４ａからケース部材１４内に挿入する。このとき、電極組立体１２をケース部材１４内に押し込むため、蓋端子組立体２０をケース部材１４に向けて押し込む。すると、図９に示すように、絶縁カバー９０の端子絶縁部９２の外面９２ｄ及び、機構絶縁部９３の外面９３ｄが電極組立体１２のタブ側端面１２ｂに同時に接触しながら、電極組立体１２が押圧される。
　そして、電極組立体１２がケース部材１４内に挿入された後、蓋部材１５をケース部材１４の開口端に接合すると、二次電池１０が組み立てられる。
　上記実施形態によれば、以下のような効果を得ることができる。
　（１）正極端子構造１６における、蓋部材１５の内面１５ｄから端子絶縁部９２の外面９２ｄまでの突出寸法Ｍ１と、負極端子構造１７における、蓋部材１５の内面１５ｄから機構絶縁部９３の外面９３ｄまでの突出寸法Ｍ２を同じにした。このため、二次電池１０の初期充電時や、二次電池１０の使用時に、二次電池１０に外力が作用したり、振動を受けたりし、電極組立体１２が蓋部材１５に向けて移動したとき、端子絶縁部９２と機構絶縁部９３の両方に電極組立体１２のタブ側端面１２ｂが接触する。そして、端子絶縁部９２及び機構絶縁部９３は共に板状であり、かつ外面９２ｄ，９３ｄが平坦面状であるため、タブ側端面１２ｂとの接触面積を広く確保できる。したがって、例えば、二次電池１０の振動時に、電極組立体１２のタブ側端面１２ｂに電流遮断機構８０が局所的に接触することを抑制でき、タブ側端面１２ｂが損傷を受けにくい。
　また、蓋端子組立体２０と電極組立体１２を一体化し、その電極組立体１２をケース部材１４に挿入する際に、タブ側端面１２ｂに対し、端子絶縁部９２及び機構絶縁部９３の外面９２ｄ，９３ｄが共当たりし、電極組立体１２に掛かる荷重が分散される。このため、電極組立体１２をケース部材１４に挿入する際に、タブ側端面１２ｂに端子絶縁部９２及び機構絶縁部９３が局所的に接触せず、タブ側端面１２ｂが損傷を受けにくい。
　（２）正極端子構造１６では、端子絶縁部９２のリブ９２ｇが内側絶縁部材４０に当接し、負極端子構造１７では、機構絶縁部９３のリブ９３ｇが端子接続部５２ｂに当接している。そして、端子絶縁部９２のリブ９２ｇでの高さＨ１を、機構絶縁部９３のリブ９３ｇでの高さＨ２より高くし、この高さの違いにより、正極端子構造１６の突出寸法Ｍ１と負極端子構造１７の突出寸法Ｍ２を同じにできる。
　（３）電流遮断機構８０の変形板８５は、絶縁カバー９０の機構絶縁部９３によって電極組立体１２側から覆われている。このため、二次電池１０の初期充電時や、二次電池１０の使用時に、二次電池１０に外力が作用したり、振動を受けたりしても、電極組立体１２のタブ側端面１２ｂが、変形板８５に接触することを規制し、変形板８５が変形することを抑制することができ、電流遮断機構８０の誤作動を抑制することができる。
　（４）絶縁カバー９０は、タブ接合部５１ａ，５２ａと蓋部材１５とを絶縁する導電部材絶縁部９１と、正極引出端子６０を電極組立体１２から絶縁する端子絶縁部９２、及び電流遮断機構８０を電極組立体１２から絶縁する機構絶縁部９３とを一体に備える。このため、タブ接合部５１ａ，５２ａと蓋部材１５の絶縁部材、正極引出端子６０と電極組立体１２の絶縁部材、電流遮断機構８０と電極組立体１２の絶縁部材をそれぞれ別々に設ける場合と比べると、二次電池１０の部品点数を減らすことができ、二次電池１０の組立作業が容易になる。
　（５）絶縁カバー９０は、絶縁部本体９１ａの長手方向両端部に収容凹部９１ｆを備え、各収容凹部９１ｆには、蓋部材１５の突部１９が入り込んでいる。突部１９は、蓋部材１５上での外側絶縁部材５７の回転を規制するために、外側絶縁部材５７の回り止め部５８が入り込む部位である。よって、二次電池１０は、外側絶縁部材５７の回り止めを規制する突部１９を蓋部材１５に備えつつも、その突部１９が絶縁カバー９０の装着状態での邪魔になることがない。
　なお、上記実施形態は以下のように変更してもよい。
　○　絶縁カバー９０が導電部材絶縁部９１と、端子絶縁部９２と、機構絶縁部９３とを一体に備える構成であったが、導電部材絶縁部９１と、端子絶縁部９２と、機構絶縁部９３とを別体としてもよい。
　○　端子絶縁部９２のリブ９２ｇや、機構絶縁部９３のリブ９３ｇを無くし、端子絶縁部９２や機構絶縁部９３の厚みそのもので突出寸法Ｍ１と突出寸法Ｍ２が同じになるようにしてもよい。
　○　絶縁カバー９０を、導電部材絶縁部９１が存在せず、端子絶縁部９２と機構絶縁部９３が一体化された構造としてもよい。
　○　絶縁カバー９０において、電流遮断機構８０の変形板８５に接触しないように機構絶縁部９３を対向方向Ｚに沿って離間させれば、逃がし凹部９３ｆは無くてもよい。
　○　蓄電装置は、正極引出端子６０と一体の電流遮断機構８０を有する二次電池にも適用することができる。この場合、正極引出端子６０と電極組立体１２のタブ側端面１２ｂとの間に機構絶縁部９３が配置され、負極引出端子６１と電極組立体１２のタブ側端面１２ｂとの間に端子絶縁部９２が配置される。正極引出端子６０が第１の電極端子に対応し、負極引出端子６１が第２の電極端子に対応する。
　○　壁部は蓋部材１５ではなく、ケース部材１４の側壁であってもよい。
　○　電極端子は、正極引出端子６０や負極引出端子６１のように、外部接続端子６６と端子接続部材４４を介して接続されるものでなくてもよく、正極導電部材５１や負極導電部材５２に直接接続されたものでもよい。
　○　蓄電装置は、例えばキャパシタなど、二次電池以外の蓄電装置にも適用可能である。
　○　正極電極２１及び負極電極３１は、金属箔の片面に活物質層が存在する構造でもよい。
　○　二次電池１０は、リチウムイオン二次電池でもよいし、他の二次電池であってもよい。要は、正極用の活物質と負極用の活物質との間をイオンが移動するとともに電荷の授受を行うものであればよい。
　次に、上記実施形態及び別例から把握できる技術的思想について以下に追記する。
　（１）異なる極性の電極が互いに絶縁されて積層された状態の電極組立体と、前記電極から突出した形状のタブが積層され、前記電極組立体の端面から突出した各極性のタブ群と、前記電極組立体及び前記タブ群を収容したケースと、前記ケースの壁部の外側に配置された外部接続端子と、前記電極組立体の端面と前記壁部との間に配置され、前記タブ群と電気的に接続された導電部材と、前記タブ群の並設方向において該タブ群よりも外側で前記導電部材に接続され、前記壁部から外部に突出した状態の引出端子と、前記壁部の外側に配置され、かつ前記引出端子と前記外部接続端子とを接続した端子接続部材と、一対の前記導電部材と前記壁部との間に介在する絶縁カバーと、を備える蓄電装置であって、前記壁部における前記外部接続端子と重なる部分に、前記外部接続端子の係合凸部を回り止めする係止凹部を前記絶縁カバーに向けて突出して備え、前記絶縁カバーは、前記係止凹部によって前記壁部から突出した部分を収容する収容凹部を備えることを特徴とする蓄電装置。
　これによれば、壁部から突出した部分は、壁部上での外部接続端子の回転を規制するための部位である。よって、蓄電装置は、外部接続端子の回り止めを規制する構造を壁部に備えつつも、その部分が絶縁カバーの装着状態での邪魔になることがない。
　（２）前記端子絶縁部の高さは、前記機構絶縁部の高さより高い蓄電装置。
　Ｍ１，Ｍ２…突出寸法、１０…蓄電装置としての二次電池、１１…ケース、１２…電極組立体、１２ｂ…タブ側端面、１５…壁部としての蓋部材、２１…正極電極、３１…負極電極、５１…正極導電部材、５２…負極導電部材、６０…第２の電極端子としての正極引出端子、６１…第１の電極端子としての負極引出端子、８０…電流遮断機構、８５…変形板、９１…導電部材絶縁部、９２…端子絶縁部、９３…機構絶縁部。

Claims (4)

  1. 　異なる極性の電極が互いに絶縁されて積層された状態の電極組立体と、
    　前記電極組立体を収容したケースと、
    　同じ極性の前記電極と電気的にそれぞれ接続され、前記ケースの壁部に固定された第１及び第２の電極端子と、
    　前記第１の電極端子と電気的に接続される電流遮断機構と、を備える蓄電装置であって、
    　前記電流遮断機構は、前記ケースの内部圧力が設定圧力に達すると、前記電極端子と前記電極組立体との間の電気的な通電経路の電流を遮断する構造を有し、
    　前記電流遮断機構を含めた前記第１の電極端子と前記電極組立体の前記端面とを絶縁する機構絶縁部と、
    　前記第２の電極端子と前記電極組立体の前記端面とを絶縁する端子絶縁部と、を備え、
    　前記壁部から前記第１の電極端子を含む前記機構絶縁部までの突出寸法と、
    　前記壁部から前記第２の電極端子を含む前記端子絶縁部までの突出寸法とが同じである蓄電装置。
  2. 　同じ極性の前記電極と前記電極端子とを接続し、前記壁部と前記端面との間に配置された一対の導電部材を備えるとともに、一対の前記導電部材と前記壁部とを絶縁する導電部材絶縁部を備え、前記端子絶縁部及び前記機構絶縁部は、前記導電部材絶縁部と一体である、請求項１に記載の蓄電装置。
  3. 　前記電流遮断機構は、一面に前記ケースの内部圧力が作用し、他面に前記ケースの外部圧力が作用する変形板を備え、かつ前記第１の電極端子と前記電極組立体との電気的な通電経路の一部を構成するとともに、前記電極組立体の端面と前記第１の電極端子との間に配置されている、請求項１又は請求項２に記載の蓄電装置。
  4. 　前記蓄電装置は二次電池である、請求項１～３の何れか一項に記載の蓄電装置。
PCT/JP2016/086875 2015-12-24 2016-12-12 蓄電装置 Ceased WO2017110548A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US15/779,603 US10862098B2 (en) 2015-12-24 2016-12-12 Power storage device
DE112016006034.3T DE112016006034T5 (de) 2015-12-24 2016-12-12 Leistungsspeichervorrichtung
CN201680074658.4A CN108370020B (zh) 2015-12-24 2016-12-12 蓄电装置
KR1020187015979A KR102053560B1 (ko) 2015-12-24 2016-12-12 축전 장치
JP2017557881A JPWO2017110548A1 (ja) 2015-12-24 2016-12-12 蓄電装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-251819 2015-12-24
JP2015251819 2015-12-24

Publications (1)

Publication Number Publication Date
WO2017110548A1 true WO2017110548A1 (ja) 2017-06-29

Family

ID=59090186

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/086875 Ceased WO2017110548A1 (ja) 2015-12-24 2016-12-12 蓄電装置

Country Status (6)

Country Link
US (1) US10862098B2 (ja)
JP (1) JPWO2017110548A1 (ja)
KR (1) KR102053560B1 (ja)
CN (1) CN108370020B (ja)
DE (1) DE112016006034T5 (ja)
WO (1) WO2017110548A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017117647A (ja) * 2015-12-24 2017-06-29 株式会社豊田自動織機 蓄電装置
JP2017117667A (ja) * 2015-12-24 2017-06-29 株式会社豊田自動織機 蓄電装置
JP2019125493A (ja) * 2018-01-17 2019-07-25 三洋電機株式会社 二次電池
EP3723154A4 (en) * 2018-10-30 2021-04-07 Contemporary Amperex Technology Co., Limited UPPER PRESS PLATE, SECONDARY BATTERY AND SECONDARY BATTERY MANUFACTURING METHOD

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114899557B (zh) * 2017-01-25 2025-08-29 三洋电机株式会社 二次电池
US11640880B2 (en) * 2017-12-12 2023-05-02 Gs Yuasa International Ltd. Energy storage device
JP7001957B2 (ja) * 2018-03-02 2022-01-20 トヨタ自動車株式会社 電池の製造方法および電池
EP4071923A4 (en) * 2020-09-30 2023-08-23 Contemporary Amperex Technology Co., Limited BATTERY CELL, BATTERY, ELECTRICAL DEVICE, AND METHOD AND SYSTEM FOR MAKING A BATTERY CELL
CN116941075B (zh) * 2021-12-15 2025-10-28 宁德时代新能源科技股份有限公司 集流构件、电池单体、电池及用电设备
CN218472105U (zh) * 2022-10-11 2023-02-10 湖北亿纬动力有限公司 电池盖板及动力电池
JP7613452B2 (ja) * 2022-11-10 2025-01-15 トヨタ自動車株式会社 蓄電セル
KR20240076489A (ko) * 2022-11-22 2024-05-30 삼성에스디아이 주식회사 이차 전지

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004172085A (ja) * 2002-11-15 2004-06-17 Samsung Sdi Co Ltd 二次電池用安全装置とそれを備えた二次電池
JP2011086604A (ja) * 2009-10-16 2011-04-28 Sb Limotive Co Ltd ２次電池
JP2012054236A (ja) * 2010-09-01 2012-03-15 Sb Limotive Co Ltd ２次電池
US20120214050A1 (en) * 2011-02-22 2012-08-23 Dukjung Kim Rechargeable battery
JP2014107147A (ja) * 2012-11-28 2014-06-09 Toyota Industries Corp 蓄電装置
JP2014127284A (ja) * 2012-12-25 2014-07-07 Toyota Motor Corp 非水電解液二次電池
JP2015095370A (ja) * 2013-11-12 2015-05-18 株式会社豊田自動織機 蓄電装置
JP2015115267A (ja) * 2013-12-13 2015-06-22 株式会社豊田自動織機 電流遮断装置を備えた蓄電装置
US20150263330A1 (en) * 2014-03-11 2015-09-17 Samsung Sdi Co., Ltd. Rechargeable battery
JP2015167085A (ja) * 2014-03-03 2015-09-24 株式会社豊田自動織機 蓄電装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100880385B1 (ko) 2006-04-10 2009-01-23 주식회사 엘지화학 안전성을 향상시키는 절연부재를 포함하고 있는 이차전지
CN102280654B (zh) * 2010-06-11 2015-06-17 深圳市比克电池有限公司 一种锂离子电池
JP5556629B2 (ja) 2010-12-01 2014-07-23 トヨタ自動車株式会社 密閉型電池
US9537121B2 (en) * 2011-03-18 2017-01-03 Samsung Sdi Co., Ltd. Secondary battery and secondary battery pack having a flexible collecting tab extending through a cap plate
JP5663415B2 (ja) * 2011-06-24 2015-02-04 日立オートモティブシステムズ株式会社 二次電池
JP5803713B2 (ja) 2012-02-08 2015-11-04 株式会社豊田自動織機 蓄電装置及び車両
US10014495B2 (en) * 2013-05-15 2018-07-03 Samsung Sdi Co., Ltd. Rechargeable battery
JP6171943B2 (ja) * 2014-01-15 2017-08-02 株式会社豊田自動織機 蓄電装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004172085A (ja) * 2002-11-15 2004-06-17 Samsung Sdi Co Ltd 二次電池用安全装置とそれを備えた二次電池
JP2011086604A (ja) * 2009-10-16 2011-04-28 Sb Limotive Co Ltd ２次電池
JP2012054236A (ja) * 2010-09-01 2012-03-15 Sb Limotive Co Ltd ２次電池
US20120214050A1 (en) * 2011-02-22 2012-08-23 Dukjung Kim Rechargeable battery
JP2014107147A (ja) * 2012-11-28 2014-06-09 Toyota Industries Corp 蓄電装置
JP2014127284A (ja) * 2012-12-25 2014-07-07 Toyota Motor Corp 非水電解液二次電池
JP2015095370A (ja) * 2013-11-12 2015-05-18 株式会社豊田自動織機 蓄電装置
JP2015115267A (ja) * 2013-12-13 2015-06-22 株式会社豊田自動織機 電流遮断装置を備えた蓄電装置
JP2015167085A (ja) * 2014-03-03 2015-09-24 株式会社豊田自動織機 蓄電装置
US20150263330A1 (en) * 2014-03-11 2015-09-17 Samsung Sdi Co., Ltd. Rechargeable battery

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017117647A (ja) * 2015-12-24 2017-06-29 株式会社豊田自動織機 蓄電装置
JP2017117667A (ja) * 2015-12-24 2017-06-29 株式会社豊田自動織機 蓄電装置
JP2019125493A (ja) * 2018-01-17 2019-07-25 三洋電機株式会社 二次電池
US11264679B2 (en) 2018-01-17 2022-03-01 Sanyo Electric Co., Ltd. Secondary battery
JP7052363B2 (ja) 2018-01-17 2022-04-12 三洋電機株式会社 二次電池
EP3723154A4 (en) * 2018-10-30 2021-04-07 Contemporary Amperex Technology Co., Limited UPPER PRESS PLATE, SECONDARY BATTERY AND SECONDARY BATTERY MANUFACTURING METHOD
US12142795B2 (en) 2018-10-30 2024-11-12 Contemporary Amperex Technology (Hong Kong) Limited Top pressing plate, secondary battery and method for manufacturing secondary battery

Also Published As

Publication number Publication date
DE112016006034T5 (de) 2018-10-25
KR102053560B1 (ko) 2019-12-06
JPWO2017110548A1 (ja) 2018-10-11
US20180351153A1 (en) 2018-12-06
US10862098B2 (en) 2020-12-08
CN108370020A (zh) 2018-08-03
KR20180081109A (ko) 2018-07-13
CN108370020B (zh) 2021-02-05

Similar Documents

Publication Publication Date Title
KR102053560B1 (ko) 축전 장치
JP6760293B2 (ja) 蓄電装置
JP6369564B2 (ja) 蓄電装置
WO2016147955A1 (ja) 蓄電装置
JP6044640B2 (ja) 蓄電装置
JP6677107B2 (ja) 蓄電装置
JP2018092726A (ja) 蓄電装置
JP6677106B2 (ja) 蓄電装置
JP2018014289A (ja) 蓄電装置
JP6597290B2 (ja) 蓄電装置
JP2015053181A (ja) 蓄電装置
JP2015195157A (ja) 蓄電装置
US20220158306A1 (en) Power storage device
JP6597292B2 (ja) 蓄電装置
JP6623898B2 (ja) 蓄電装置
JP6547487B2 (ja) 蓄電装置モジュール
JP2016054022A (ja) 蓄電装置
WO2019039081A1 (ja) 蓄電装置及び蓄電装置の製造方法
JP6394894B2 (ja) 蓄電装置
JP2017027779A (ja) 蓄電装置の製造方法
JP2018010850A (ja) 蓄電装置
JP6623899B2 (ja) 蓄電装置の製造方法
JP2018037223A (ja) 蓄電装置
JP2017098150A (ja) 蓄電装置
JPWO2016084693A1 (ja) 蓄電装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16878439

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017557881

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20187015979

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 112016006034

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16878439

Country of ref document: EP

Kind code of ref document: A1