WO2019026455A1 - Current interrupting device and electricity storage device - Google Patents

Current interrupting device and electricity storage device Download PDF

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Publication number
WO2019026455A1
WO2019026455A1 PCT/JP2018/023513 JP2018023513W WO2019026455A1 WO 2019026455 A1 WO2019026455 A1 WO 2019026455A1 JP 2018023513 W JP2018023513 W JP 2018023513W WO 2019026455 A1 WO2019026455 A1 WO 2019026455A1
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WO
WIPO (PCT)
Prior art keywords
current
central portion
carrying member
deformation
joint
Prior art date
Application number
PCT/JP2018/023513
Other languages
French (fr)
Japanese (ja)
Inventor
竜二 大井手
幹也 栗田
貴之 弘瀬
俊昭 岩
小川　義博
淳 光安
騎慎 秋吉
Original Assignee
株式会社豊田自動織機
イーグル工業株式会社
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
Priority claimed from JP2017151900A external-priority patent/JP2020181630A/en
Priority claimed from JP2017151908A external-priority patent/JP2020181631A/en
Application filed by 株式会社豊田自動織機, イーグル工業株式会社 filed Critical 株式会社豊田自動織機
Publication of WO2019026455A1 publication Critical patent/WO2019026455A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the current interrupting device that cuts off the current flowing between the electrode terminals (positive and negative terminals) using pressure rise in the case when the storage device is overcharged or a short circuit occurs internally is advanced. ing.
  • the current interrupting device is disposed between the electrode terminal and the electrode (between the positive electrode terminal and the positive electrode or between the negative electrode terminal and the negative electrode).
  • Patent Document 1 JP-A-2014-41791 (hereinafter referred to as Patent Document 1), the first current-carrying member connected to the electrode terminal, the second current-carrying member connected to the electrode, and the end portion are the first current-carrying
  • a current interrupting device is disclosed that includes a deformation member (inverted plate) connected to the member and having a central portion joined to the second current-carrying member.
  • Patent Document 2 when the pressure in the case rises, the deformable member is reversed, and the central portion of the deformable member is disconnected from the second current-carrying member, thereby interrupting the current.
  • Patent Document 2 a power storage device utilizing inversion of the deformable member is also disclosed in Japanese Patent Laid-Open No. 2014-220052 (Patent Document 2).
  • the deformation member may re-contact the second current-carrying member.
  • the deformation member may re-contact the second current-carrying member.
  • the present specification aims to provide a highly reliable current interrupting device.
  • the current interrupting device disclosed in the present specification interrupts the energization of the electrode terminal and the electrode when the pressure in the case of the power storage device exceeds a predetermined value.
  • the current interrupting device includes a first current-carrying member connected to the electrode terminal, a second current-carrying member connected to the electrode, and a deformation member disposed between the first current-carrying member and the second current-carrying member. You may be equipped.
  • the first conducting member may have a central portion recessed with respect to the end.
  • the second current-carrying member may be disposed to face the side of the first current-carrying member provided with the recess at a distance from the first current-carrying member.
  • the deformable member may be conductive, and an end thereof may be joined to an end of the first current-carrying member, and a central portion may be in contact with the second current-carrying member.
  • the central portion of the deformable member is separated from the second conductive member and moved to the first conductive member side, and the deformable member is the first conductive member. It may touch the central part.
  • the deformation member contacts the central portion of the first current-passing member. More specifically, the deformation member contacts the central portion of the first current-carrying member in a state of being joined to the end portion of the first current-carrying member.
  • the movement of the deformation member is limited, and the force (tensile stress) applied to the joint between the deformation member and the first current-carrying member can be reduced. Damage to the joint (partial or total separation of the deformation member from the end of the first current-carrying member) can be suppressed.
  • the pressure difference between the front and back surfaces of the deformation member can be maintained, and the deformation member can be prevented from re-contacting the second current-carrying member. Therefore, it is possible to suppress unintentional re-energization of the power storage device after the power storage device is de-energized.
  • the deformation amount of the deformable member in the first conductive member first When a depression deeper than the amount of protrusion to the current-passing member side is formed, the force projecting to the first current-passing member side with respect to the deformable member is large even after the deformable member protrudes the maximum amount to the first current-passing member side Join. As a result, damage may occur to the joint (the end of the first current-carrying member) of the deformation member and the first current-carrying member.
  • the pressure difference between the front and back surfaces of the deformable member disappears, and the force causing the deformable member to protrude toward the first conductive member disappears. It is possible that the deformation member re-contacts the second current-carrying member and the power storage device re-energizes.
  • the distance from the central portion to the end of the first current-carrying member is from the joining surface of the deformation member and the first current-carrying member It may be smaller than the distance to the contact surface.
  • the depth of the depression provided in the first current-carrying member may be smaller than the protruding height of the central portion of the deformation member.
  • a through hole communicating with the outside of the case is provided at the central portion of the first current-passing member, and the deformation member blocks the through-hole when the deforming member contacts the center portion of the first current-passing member. It is good.
  • the deformation member can be easily turned on when re-energizing the deformation member and the second current-carrying member. It can be made to contact a 2nd electricity supply member.
  • the deformation member closes the through hole, even if breakage occurs in the joint between the deformation member and the first current-carrying member, the pressure difference between the front and back surfaces of the deformation member can be maintained. That is, even if the joint between the first current-carrying member and the deformation member is damaged, it is possible to suppress the re-contact of the deformation member with the second current-supply member without intention.
  • the central portion of the deformable member is joined to the central portion of the second current-carrying member at the first joint portion, and the end of the deformable member is joined to the end portion of the first conductive member at the second joint portion
  • the length from the first joint to the second joint may be longer than the length of a straight line connecting the first joint and the second joint.
  • the deformation member is joined to the second current-carrying member, and the middle portion between the center portion and the end portion is more than the straight line. It may be a first state located on the second current-carrying member side.
  • the deformable member when the pressure in the case becomes larger than the normal value, the deformable member is in the second state in which the intermediate portion is positioned closer to the first conductive member side than the straight line while being joined to the second conductive member. Good. Furthermore, the deformation member may be in a third state separated from the second current-carrying member when the pressure in the case exceeds a predetermined value. In the second state, at least a part of the intermediate portion may be located in the recess of the first current-carrying member, and the intermediate portion may not be in contact with the central portion of the first current-carrying member.
  • the movable portion (intermediate portion) of the deformable member is prevented from coming into contact with the first conductive member in the process in which the deformable member is separated from the second conductive member and the current is cut off. Since the movement of the deformation member is not impeded, the deformation member is separated from the second current-carrying member at the set pressure (predetermined value). That is, the current interrupter is driven at the set pressure.
  • the current interrupting device pays attention to the movement of the deformation member from when the pressure in the case starts to increase to a predetermined value, and adjusts the arrangement positions of the first current-carrying member and the deformation member so as not to impede the movement. Thus, the reliability can be improved more than in the past.
  • the central portion of the deformable member may be parallel to the surface of the second conductive member on the side of the first conductive portion.
  • the first joint portion may be provided inside the outer periphery of the central portion of the deformation member.
  • the depth of the recess of the first current-carrying member may be defined such that, in the second state, the middle point of the intermediate portion of the deformable member is not in contact with the central portion of the first current-carrying member.
  • the said current interruption apparatus arrange
  • the first joint portion (the portion where the deformation member and the second conduction member are joined) is provided inside the outer periphery of the central portion of the deformation member, the positions of the two when joining the deformation member and the second conduction member It is possible to join the two at a portion (first joint) in which both are disposed in parallel without highly controlling the alignment.
  • the deformation member When the central portion of the deformation member is parallel to the second current-carrying member and the deformation member and the second current-carrying member are joined inside the outer periphery of the central portion of the deformation member, the deformation member is It has a bent shape at the boundary between the central part and the middle part. In this case, when the deformation member is in the second state, the middle point of the intermediate portion is located farthest from the surface of the second current-carrying member. That is, the middle point of the middle portion protrudes most toward the first current-carrying member.
  • the middle point of the intermediate portion is not in contact with the central portion of the first current-carrying member in the second state, it is ensured that the motion of the deforming member is impeded when the deforming member protrudes toward the first current-carrying member. Can be prevented.
  • the current interrupting device interrupts the energization of the electrode terminal and the electrode when the pressure in the case of the power storage device exceeds a predetermined value.
  • the current interrupting device includes a first current-carrying member connected to the electrode terminal, a second current-carrying member connected to the electrode, and a deformable member disposed between the first current-carrying member and the second current-carrying member. May be provided.
  • the first current-carrying member may have a first central portion and a first end. The first central portion may be recessed relative to the first end.
  • the second current-carrying member may be disposed to face the first current-carrying member at an interval from the first current-carrying member.
  • the second current-carrying member may have a second central portion and a second end.
  • the second central portion may be in contact with the deformation member.
  • the second end may be connected to the electrode.
  • the deformation member may have conductivity and be connected to both the first current-carrying member and the second current-carrying member.
  • the length from the first joint to the second joint of the deformable member may be longer than the length of a straight line connecting the first joint and the second joint.
  • the deformable member may be switched from the first state to the third state according to the pressure in the case.
  • the third central portion of the deformation member is joined to the second current-carrying member, and the intermediate portion between the third central portion and the third end is The first state may be located closer to the second conductive member than the straight line. Further, when the pressure in the case becomes larger than the normal value, the deformable member is positioned such that the intermediate portion is closer to the first current-passing member side than the straight line while the third central portion is joined to the second current-passing member. It may be in 2 state. Furthermore, the deformation member may be in a third state in which the third central portion is separated from the second current-carrying member when the pressure in the case exceeds a predetermined value. In the current interrupting device, in the second state, a part of the middle part may be located in the recess surrounded by the first end and not in contact with the first center part.
  • the third central portion may be parallel to the surface of the second current-carrying member on the side of the first current-carrying portion.
  • the first bonding portion may be provided inside the outer periphery of the third central portion. In this case, in the second state, the depth of the depression of the first central portion may be adjusted such that the center of the intermediate portion is not in contact with the first central portion.
  • the movable portion (intermediate portion) of the deformation member is prevented from coming into contact with the first conduction member in the process of the deformation member being separated from the second conduction member and the current being cut off.
  • FIG. 1 shows a cross-sectional view of a power storage device provided with a current interrupting device. It is the range enclosed with the broken line II of FIG. 1, and shows sectional drawing of an electric current interruption apparatus.
  • Fig. 6 shows a cross-sectional view of the current interrupting device when the pressure in the case rises. The pressure in a case rises and sectional drawing of an electric current interruption apparatus when exceeding predetermined pressure is shown.
  • Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device.
  • Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device.
  • Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device.
  • Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device.
  • the negative electrode connection terminal 7 is an example of a first current-carrying member
  • the deformation plate 20 is an example of a deformation member
  • the breaking plate 30 is an example of a second current-carrying member.
  • the range surrounded by the protrusion 99 is an example of the first central portion, and the protrusion 99 is an example of the first end.
  • the central portion 31 is an example of a second central portion
  • the outer peripheral portion 32 is an example of a second end.
  • the central portion 21 is an example of a third central portion
  • the outer peripheral portion 22 is an example of a third end.
  • the weld 40 is an example of a first joint
  • the weld 91 is an example of a second joint.
  • Power storage device 100 is a secondary battery, and includes current interrupt device 10.
  • the storage device 100 includes a case 1, an electrode assembly 3 housed in the case 1, and a positive electrode connection terminal 5 and a negative electrode connection terminal 7 fixed to the case 1.
  • the positive electrode connection terminal 5 and the negative electrode connection terminal 7 may be collectively referred to as electrode connection terminals 5 and 7.
  • the case 1 is made of metal and is a box-shaped member having a substantially rectangular parallelepiped shape.
  • An electrode assembly 3 and a current interrupting device 10 are housed inside the case 1.
  • the electrode assembly 3 is electrically connected to the electrode connection terminals 5 and 7.
  • the current interrupting device 10 is disposed between the electrode assembly 3 and the negative electrode connection terminal 7.
  • an electrolytic solution is injected, and the air is removed.
  • the electrode assembly 3 is immersed in the electrolyte solution.
  • the case 1 includes a main body 111 and a lid 112 fixed to the main body 111.
  • the lid 112 covers the top of the main body 111.
  • the lid 112 is provided with mounting holes 81 and 82.
  • the positive electrode connection terminal 5 communicates with the inside and the outside of the case 1 through the mounting hole 81.
  • the negative electrode connection terminal 7 communicates with the inside and the outside of the case 1 through the mounting hole 82.
  • the electrode assembly 3 includes a positive electrode, a negative electrode, and a separator (not shown).
  • the separator is disposed between the positive electrode and the negative electrode.
  • the electrode assembly 3 has a structure in which a plurality of laminates (unit cells) including a positive electrode, a negative electrode, and a separator are stacked.
  • Each of the plurality of positive electrodes includes a positive current collecting member and a positive electrode active material layer formed on the positive current collecting member.
  • An aluminum foil is mentioned as an example of a positive electrode current collection member.
  • each of the plurality of negative electrodes includes a negative electrode current collecting member and a negative electrode active material layer formed on the negative electrode current collecting member.
  • a copper foil is mentioned as an example of a negative electrode current collection member.
  • the electrode assembly 3 further includes a positive electrode current collecting tab 51 provided for each positive electrode and a negative electrode current collecting tab 52 provided for each negative electrode.
  • the positive electrode current collection tab 51 is provided on the upper end of the positive electrode (the end on the lid 112 side of the electrode assembly 3).
  • the negative electrode current collection tab 52 is provided at the upper end of the negative electrode.
  • the positive electrode current collection tab 51 and the negative electrode current collection tab 52 protrude above the electrode assembly 3 (the lid 112 side).
  • the plurality of positive electrode current collection tabs 51 are collected into one and connected to the positive electrode lead 53.
  • the plurality of negative electrode current collection tabs 52 are put together and connected to the negative electrode lead 54.
  • the positive electrode lead 53 is connected to the positive electrode current collection tab 51 and the positive electrode connection terminal 5.
  • the positive electrode current collection tab 51 and the positive electrode connection terminal 5 are electrically connected via the positive electrode lead 53.
  • An insulating member 70 is disposed between the positive electrode lead 53 and the case 1. The insulating member 70 insulates the positive electrode lead 53 and the case 1 (the lid 112).
  • the negative electrode lead 54 is connected to the negative electrode current collection tab 52 and the connection terminal 56.
  • the connection terminal 56 is electrically connected to the negative electrode connection terminal 7 via the current interrupting device 10. That is, the negative electrode current collection tab 52 and the negative electrode connection terminal 7 are electrically connected via the negative electrode lead 54, the connection terminal 56 and the current interrupting device 10. As a result, a conduction path connecting the electrode assembly 3 and the negative electrode connection terminal 7 is formed.
  • the current interrupting device 10 can interrupt this current path. Details of the current interrupting device 10 will be described later.
  • An insulating member 71 is disposed between the negative electrode lead 54 and the case 1. The insulating member 71 insulates the negative electrode lead 54 and the case 1 (the lid 112).
  • Gaskets 62 and 63 made of resin are disposed on the upper surface of the lid 112 (outside of the case 1).
  • the gaskets 62 and 63 have insulating properties.
  • the gasket 62 is fixed to the positive electrode connection terminal 5.
  • a positive electrode external terminal (metal plate) 60 is disposed on the upper surface of the gasket 62.
  • a through hole 60 a is formed in the positive electrode external terminal 60.
  • the size of the lower surface side of the through hole 60a is larger than that of the upper surface side.
  • the gasket 62 insulates the lid 112 and the positive electrode external terminal 60.
  • the bolt 64 passes through the through hole 60a. Specifically, the head of the bolt 64 is accommodated in the through hole 60a. Further, the shaft portion of the bolt 64 protrudes above the positive electrode external terminal 60 through the through hole 60 a.
  • the positive electrode connection terminal 5, the positive electrode external terminal 60, and the bolt 64 are electrically connected to form a positive electrode terminal.
  • the gasket 63 is fixed to the negative electrode connection terminal 7.
  • a negative electrode external terminal (metal plate) 61 is disposed on the upper surface of the gasket 63.
  • a through hole 61a similar to the through hole 60a of the positive electrode external terminal 60 is formed.
  • the head portion of the bolt 65 is accommodated in the through hole 61 a, and the shaft portion of the bolt 65 protrudes above the negative electrode external terminal 61 through the through hole 61 a.
  • the configurations of the gasket 63, the negative electrode external terminal 61, and the bolt 65 are the same as the configurations of the gasket 62, the positive electrode external terminal 60, and the bolt 64 described above.
  • the negative electrode connection terminal 7, the negative electrode external terminal 61, and the bolt 65 are electrically connected, and constitute a negative electrode terminal.
  • FIG. 2 shows a state in which the pressure in the case 1 is within the normal range and the current interrupting device 10 is not operating.
  • FIG. 3 shows the state of the current interrupting device 10 when the pressure in the case 1 rises beyond the normal range.
  • FIG. 3 shows a state before the current interrupting device 10 operates (the electrode assembly 3 and the negative electrode connection terminal 7 are energized).
  • FIG. 4 shows a state after the pressure in the case 1 exceeds a predetermined value and the current interrupting device 10 operates.
  • the state of FIG. 2 may be referred to as a first state, the state of FIG. 3 as a second state, and the state of FIG. 4 as a third state.
  • the current interrupting device 10 includes a negative electrode connection terminal 7, a breaking plate 30, a deformation plate 20, and a holder 80.
  • the negative electrode connection terminal 7 is fixed to the lid 112 by caulking.
  • the negative electrode connection terminal 7 is a caulking component (a caulking terminal).
  • the negative electrode connection terminal 7 includes a cylindrical portion 94, a base 95, and a fixing portion 96.
  • the cylindrical portion 94 passes through the mounting hole 82.
  • the cylindrical portion 94 also has a through hole 97.
  • the base 95 is annular and fixed to the lower end of the cylindrical portion 94.
  • the base 95 is disposed inside the case 1.
  • the base 95 has a flat surface extending along the lid 112. At the end in the plane direction of the base 95, a protrusion 99 is provided which protrudes downward (toward the electrode assembly 3).
  • the base 95 is formed with a recess 98. Specifically, the range (the central portion of the base 95) surrounded by the projecting portion 99 is recessed with respect to the projecting portion 99 provided at the end in the surface direction of the base 95. At the center of the bottom of the recess 98, the through hole 97 is located. The recess 98 and the through hole 97 communicate with each other. Therefore, the space 12 in the recess 98 communicates with the outside of the case 1 through the through hole 97. Space 12 is maintained at atmospheric pressure.
  • the fixing portion 96 is fixed to the upper end of the cylindrical portion 94. The fixing portion 96 is disposed outside the case 1.
  • the negative electrode connection terminal 7 is fixed to the case 1 (lid part 112) by the fixing part 96.
  • the fracture plate 30 is made of metal and has conductivity.
  • the fracture plate 30 is circular in plan view.
  • the breaking plate 30 is disposed at a position facing the base 95.
  • the fracture plate 30 is not in direct contact with the base 95 (the negative electrode connection terminal 7), and is disposed at a distance from the base 95. That is, the breaking plate 30 is disposed on the side of the base 95 provided with the recess 98 (below the base 95) at a distance from the base 95 (in a non-contact state with the base 95).
  • the fracture plate 30 is connected to the base 95 via the deformation plate 20.
  • the rupture plate 30 has a central portion 31 and an outer peripheral portion 32.
  • the deformation plate 20 is joined to the central portion 31.
  • the upper surface (the surface on the deformation plate 20 side) of the fracture plate 30 is substantially flat from the central portion 31 to the outer peripheral portion 32.
  • the central portion 31 is recessed with respect to the outer peripheral portion 32. Therefore, the thickness of the central portion 31 is thinner than the thickness of the outer peripheral portion 32.
  • the breaking groove 33 is provided on the lower surface of the breaking plate 30.
  • the fracture groove 33 is provided between the central portion 31 and the outer circumferential portion 32 of the fracture plate 30. Therefore, in the fracture plate 30, the thickness of the outer side (outer peripheral part 32) of the fracture groove 33 is thicker than the thickness of the inner side (central part 31) of the fracture groove 33.
  • the connection terminal 56 is connected to the outer peripheral portion 32 of the fracture plate 30. That is, the fracture plate 30 is connected to the negative electrode through the connection terminal 56.
  • the fracture plate 30 is supported by the holder 80.
  • the holder 80 is formed of polyphenylene sulfide (PPS) resin.
  • the holder 80 is disposed in the case 1 so as to surround the base 95 of the negative electrode connection terminal 7.
  • the holder 80 has an upper portion 79 and a lower portion 78.
  • the upper portion 79 has a flat surface extending along the lid 112 of the case 1.
  • a through hole 79 a is provided at the center of the upper portion 79.
  • the cylindrical portion 94 of the negative electrode connection terminal 7 passes through the through hole 79a.
  • the upper portion 79 is disposed between the lid 112 of the case 1 and the base 95 of the negative electrode connection terminal 7.
  • the holder 80 is fixed to the case 1 together with the negative electrode connection terminal 7. That is, the holder 80 is fixed to the negative electrode connection terminal 7.
  • the holder 80 has an insulating property.
  • the holder 80 insulates the case 1 (the lid 112) and the negative electrode connection terminal 7
  • the lower portion 78 of the holder 80 extends downward from the outer peripheral edge of the upper portion 79.
  • the lower portion 78 of the holder 80 extends below the lower end of the base 95 (projecting portion 99) of the negative electrode connection terminal 7.
  • the base 95 is disposed inside the lower portion 78.
  • the fracture plate 30 is fixed to the lower end of the holder 80 via the connection layer 75.
  • the connection layer 75 is welded to both the breaking plate 30 and the holder 80.
  • the deformation plate 20 is a conductive diaphragm.
  • the deformation plate 20 is disposed below the negative electrode connection terminal 7. More specifically, the deformation plate 20 is disposed between the negative electrode connection terminal 7 (base 95) and the breaking plate 30.
  • the deformation plate 20 has a central portion 21 and an outer peripheral portion (end portion) 22.
  • the central portion 21 is parallel to the upper surface (the surface on the deformation plate 20 side) of the fracture plate 30.
  • the central portion 21 is in surface contact with the upper surface of the fracture plate 30.
  • the central portion 21 and the fracture plate 30 are joined (welded) inside the outer periphery 21 a of the central portion 21.
  • the welded portion 40 of the deformation plate 20 is welded to the central portion 31 of the fracture plate.
  • the welding portion 40 is provided on the inner side than the fracture groove 33.
  • the deformation plate 20 is joined to the thin portion (central portion 31) of the fracture plate 30.
  • the outer peripheral portion 22 is parallel to the lower surface of the negative electrode connection terminal 7 (projecting portion 99).
  • the outer peripheral portion 22 is in surface contact with the lower surface of the negative electrode connection terminal 7.
  • the entire outer peripheral portion 22 is joined (welded) to the negative electrode connection terminal 7. That is, the entire outer peripheral portion 22 constitutes a welded portion 91.
  • the outer peripheral portion 22 is joined to the negative electrode connection terminal 7 over the entire circumference.
  • An intermediate portion 23 is provided between the central portion 21 and the outer peripheral portion 22.
  • the intermediate portion 23 connects the central portion 21 and the outer peripheral portion 22.
  • the deformation plate 20 is joined to both the negative electrode connection terminal 7 and the breaking plate 30.
  • the length of the deformed plate between the welds 40 and 91 (the sum of the length of the middle part 23 and the length of the central part 21 outside the weld 40) is the length of the straight line connecting the weld 40 and the weld 91 ( The shortest distance between welds 40, 91).
  • the intermediate portion 23 is located below the straight line connecting the welding portion 40 and the welding portion 91 (the fracture plate 30 side). Therefore, the middle portion 23 is convex downward.
  • the deformation plate 20 is convex downward as a whole, and the middle portion 23 is also convex downward.
  • the deformation plate 20 divides the space 12 at the upper part of the deformation plate 20 and the space 14 at the lower part.
  • the space 12 communicates with the space outside the case 1 through the through hole 97.
  • the pressure of the space 12 is atmospheric pressure.
  • the communication hole 77 is formed in a part between the holder 80 and the breaking plate 30. The communication hole 77 communicates the space 14 between the deformation plate 20 and the breaking plate 30 with the space in the case 1 (the space outside the current interrupting device 10). Therefore, the pressure of the space 14 is the pressure of the space in the case 1.
  • the current interrupting device 10 When the pressure in the case 1 is equal to or less than a predetermined value, the negative electrode connection terminal 7 and the negative electrode current collection tab 52 are electrically connected via the current interrupting device 10. That is, current is supplied between the negative electrode connection terminal 7 and the negative electrode.
  • the current interrupting device 10 interrupts the energization of the negative electrode connection terminal 7 and the negative electrode current collecting tab 52 to prevent the current from flowing to the power storage device 100.
  • the pressure in the case 1 is a normal value (pressure smaller than a predetermined value)
  • the deformation plate 20 is downward with the central portion 21 joined to the rupture plate 30. It is convex.
  • the intermediate portion 23 is also convex downward (first state).
  • the deformed plate 20 is such that the portion between the welding portion 40 and the welding portion 91 is upward in a state in which the central portion 21 is joined to the fracture plate 30 (as a whole, remains convex downward). Be convex.
  • the intermediate portion 23 is located above (on the negative electrode connection terminal 7 side) the straight line connecting the welding portion 40 and the welding portion 91 (second state).
  • the upper end of the intermediate portion 23 (the portion closest to the negative electrode connection terminal 7) is located in the recess 98 (a space in a range surrounded by the projecting portion 99). Further, the intermediate portion 23 is not in contact with the negative electrode connection terminal 7 (base 95).
  • the breaking plate 30 is broken starting from the breaking groove 33. Therefore, as shown in FIG. 4, the central portion 21 of the deformation plate 20 moves upward, and the deformation plate 20 (central portion 21) separates from the fracture plate 30 (third state). More specifically, the central portion 31 of the breaking plate 30 separates from the outer peripheral portion 32 of the breaking plate 30 while being joined to the central portion 21 of the deformation plate 20.
  • the electrode assembly 3 (negative electrode) is connected to the outer peripheral portion 32 of the fracture plate 30 via the connection terminal 56.
  • the central portion 31 of the fracture plate 30 When the central portion 31 of the fracture plate 30 is separated from the outer circumferential portion 32, the conduction path of the fracture plate 30 and the deformation plate 20 is cut off, and the electrode assembly 3 (negative electrode) and the negative electrode connection terminal 7 become non-energized. The current flowing between the electrode terminals (positive electrode terminal and negative electrode terminal) of power storage device 100 is cut off.
  • the central portion 21 of the deformation plate 20 moves upward (the base 95 side), and the deformation plate 20 is convex upward as a whole, and the middle portion 23 is also convex upward.
  • the deformation plate 20 In the third state, the deformation plate 20 is in contact with the lower surface of the negative electrode connection terminal 7 (the base 95) to close the through hole 97.
  • FIG. 5 shows the first state
  • FIG. 6 shows the second state
  • FIG. 7 shows the third state
  • 5 to 7 show the shape of each part in a simplified manner.
  • FIGS. 5 to 7 show the intervals between the parts or the like larger than the actual ones in order to clearly show the positional relationship between the parts.
  • the protrusion 99 protrudes a distance 99 h from the base 95.
  • the distance from the lower surface of the protrusion 99 to the surface of the recess 98 (the lower surface of the base 95) is a distance 99h.
  • the base 95 is formed with a recess 98 having a depth of 99 h.
  • the distance from the lower surface of the projection 99 (the joint surface between the outer peripheral portion 22 of the deformation plate 20 and the negative electrode connection terminal 7) to the surface of the breaking plate 30 (the contact surface between the central portion 21 of the deformation plate 20 and the breaking plate 30) is a distance It is 20h.
  • the downward projecting height of the deformation plate 20 in the first state is a distance 20 h.
  • the distance 99h is smaller than the distance 20h. Therefore, in the first state, the protrusion height of the deformation plate 20 is larger than the depth of the recess 98. In other words, the depth (distance 99 h) of the recess 98 is smaller than the protruding height (distance 20 h) of the deformation plate 20 in the first state.
  • the intermediate portion 23 and the central portion 21 are located below the straight line 18 connecting the weld portion 40 and the weld portion 91. .
  • the point 25 indicates the middle point of the middle portion 23.
  • the deformation plate 20 between the welds 40 and 91 is inverted upward. That is, the deformation plate 20 is reversed with the welds 40 and 91 as a fulcrum.
  • the middle point (point 25) of the middle portion 23 is displaced the most. That is, the middle point of the middle portion 23 is positioned at the top.
  • the height of the point 25 with respect to the lower surface of the protrusion 99 is a distance 25 h.
  • the distance 25h is smaller than the distance 99h. That is, the distance 99 h is defined such that the middle point of the intermediate portion 23 does not contact the base 95.
  • the deformed portion (between the welds 40 and 91) of the deformation plate 20 does not contact the negative electrode connection terminal 7.
  • the distance 25h is uniquely determined by the distance between the projection 99 and the fracture plate 30 (distance 20h), the length of the intermediate portion 23, the length of the central portion 21, and the position of the welded portion 40 in the central portion 21. .
  • the central portion 31 of the breaking plate 30 is broken, and the deformation plate 20 is inverted upward.
  • the deformation plate 20 projects upward.
  • the projection height (the projection height downward) of the deformation plate 20 is larger than the depth of the recess 98. Therefore, when the deformation plate 20 projects upward, the deformation plate 20 contacts the surface of the recess 98 (the lower surface of the base 95). In addition, the through hole 97 is closed by the deformation plate 20.
  • the deformation plate 20 is designed to invert at a predetermined pressure. Therefore, for example, when the pressure receiving area of the deformation plate 20 changes, the reverse pressure of the deformation plate 20 (the operating pressure of the current interrupting device 10) may deviate from the design value.
  • the movable portion (deformable portion) of the deformation plate 20 contacts another part in the process of separating the deformation plate 20 from the fracture plate 30, the area of the movable portion of the deformation plate 20 is reduced, and the substantial deformation plate 20 is substantially reduced. It is possible that the pressure receiving area of the pressure plate decreases and the reversal pressure of the deformation plate 20 deviates from the design value. As described above, in the current interrupting device 10, the movable portion of the deformation plate 20 does not contact other components while the pressure in the case 1 increases and reaches a predetermined value (second state). Therefore, it is possible to suppress the reverse pressure of the deformation plate 20 from deviating from the design value.
  • deformation plate 20 contacts negative electrode connection terminal 7.
  • the pressure in the case 1 continues to act on the lower surface of the deformation plate 20, and tensile stress continues to act on the welded portion 91.
  • breakage of the welded portion 91 may occur.
  • breakage of the deformation plate 20 may occur.
  • the space 12 at the upper portion of the deformation plate 20 and the space 14 at the lower portion can not be divided. In other words, the inside of the case 1 can not be sealed.
  • deformation plate 20 may move downward (to the fracture plate 30 side), and the deformation plate 20 may come into contact with the fracture plate 30 again.
  • deformation plate 20 is in contact with negative electrode connection terminal 7, whereby breakage of welded portion 91 and / or deformation plate 20 is suppressed, and the pressure difference between the upper and lower portions of deformation plate 20 can be maintained. .
  • the deformation plate 20 is prevented from moving downward, and the power storage device 100 can be prevented from reenergizing.
  • the deformation plate 20 may not necessarily be joined to the breaking plate 30.
  • the central portion 21 of the deformation plate 20 may be in contact with the breaking plate 30 when the pressure in the case 1 is a normal value.
  • channel 33 may be abbreviate
  • the current interrupting device may be disposed on the conduction path of the positive electrode and the positive terminal, or may be disposed on both the conduction path of the negative electrode and the negative terminal and on the conduction path of the positive electrode and the positive terminal. Good.

Abstract

This current interrupting device is provided with: a first conductive member connected to an electrode terminal; a second conductive member connected to an electrode; and a deformable member. The first conductive member has a center portion that is recessed from an end portion. The second conductive member is disposed facing the first conductive member side on which the recess is formed, said second conductive member being disposed by having a gap between the first conductive member and the second conductive member. An end portion of the deformable member is bonded to the first conductive member, and a center portion is in contact with the second conductive member. When the pressure in a case exceeds a predetermined value, the center portion of the deformable member moves to the first conductive member side by separating from the second conductive member, and the deformable member comes into contact with the center portion of the first conductive member.

Description

電流遮断装置及び蓄電装置Current interrupting device and power storage device
　本出願は、２０１７年８月４日に出願された日本国特許出願第２０１７－１５１９００号、及び、２０１７年８月４日に出願された日本国特許出願第２０１７－１５１９０８号に基づく優先権を主張する。これらの出願の全ての内容は、この明細書中に参照により援用されている。本明細書は、電流遮断装置及び蓄電装置に関する。 Priority is claimed on Japanese Patent Application No. 2017-151900 filed on Aug. 4, 2017, and Japanese Patent Application No. 2017-151908 filed on Aug. 4, 2017. Insist. The contents of all of these applications are incorporated by reference in this specification. The present specification relates to a current interrupting device and a power storage device.
　蓄電装置が過充電されたり、内部で短絡が発生したときに、ケース内の圧力上昇を利用し、電極端子間（正極端子と負極端子）に流れる電流を遮断する電流遮断装置の開発が進められている。電流遮断装置は、電極端子と電極の間（正極端子と正極の間又は負極端子と負極の間）に配置される。特開２０１４－４１７９１号公報（以下、特許文献１と称する）には、電極端子に接続されている第１通電部材と、電極に接続されている第２通電部材と、端部が第１通電部材に接続されているとともに中央部が第２通電部材に接合されている変形部材（反転板）を備えた電流遮断装置が開示されている。特許文献１の電流遮断装置は、ケース内の圧力が上昇すると、変形部材が反転し、変形部材の中央部が第２通電部材から分離することにより、電流を遮断している。なお、変形部材の反転を利用した蓄電装置は、特開２０１４－２２００５２号公報（特許文献２）にも開示されている。 Development of a current interrupting device that cuts off the current flowing between the electrode terminals (positive and negative terminals) using pressure rise in the case when the storage device is overcharged or a short circuit occurs internally is advanced. ing. The current interrupting device is disposed between the electrode terminal and the electrode (between the positive electrode terminal and the positive electrode or between the negative electrode terminal and the negative electrode). In JP-A-2014-41791 (hereinafter referred to as Patent Document 1), the first current-carrying member connected to the electrode terminal, the second current-carrying member connected to the electrode, and the end portion are the first current-carrying A current interrupting device is disclosed that includes a deformation member (inverted plate) connected to the member and having a central portion joined to the second current-carrying member. In the current interrupting device of Patent Document 1, when the pressure in the case rises, the deformable member is reversed, and the central portion of the deformable member is disconnected from the second current-carrying member, thereby interrupting the current. Incidentally, a power storage device utilizing inversion of the deformable member is also disclosed in Japanese Patent Laid-Open No. 2014-220052 (Patent Document 2).
　特許文献１及び２では、変形部材の反転を許容するため、第１通電部材の中央部が端部に対して窪んでいる。特許文献１及び２では、ケース内の圧力が上昇すると、第１通電部材に設けられた窪み内で変形部材の中央部が第２通電部材とは反対側（第１通電部材側と称することがある）に突出した状態を保持する。このように、変形部材を利用した電流遮断装置では、変形部材と周囲の部材（第１通電部材，第２通電部材）の位置関係が適切に調整されていないと、変形部材の動作が阻害されたり、変形部材が第２通電部材から分離した後、変形部材が第２通電部材に再接触することが起こり得る。電流遮断装置の信頼性を確保するためには、変形部材と周囲の部材の位置関係が適切に調整されていることが必要である。本明細書は、信頼性の高い電流遮断装置を提供することを目的とする。 In the patent documents 1 and 2, in order to allow reversal of a deformation member, the central part of the 1st energization member is depressed to the end. In Patent Literatures 1 and 2, when the pressure in the case rises, the central portion of the deformation member in the depression provided in the first current-carrying member is opposite to the second current-carrying member (referred to as the first current-carrying member side) Hold the protruding state). As described above, in the current interrupting device using the deformable member, the operation of the deformable member is inhibited unless the positional relationship between the deformable member and the surrounding members (the first current-carrying member, the second current-carrying member) is properly adjusted. Alternatively, after the deformation member is separated from the second current-carrying member, the deformation member may re-contact the second current-carrying member. In order to ensure the reliability of the current interrupting device, it is necessary that the positional relationship between the deformation member and the surrounding members be properly adjusted. The present specification aims to provide a highly reliable current interrupting device.
　本明細書に開示する電流遮断装置は、蓄電装置のケース内の圧力が所定値を超えたときに電極端子と電極の通電を遮断する。この電流遮断装置は、電極端子に接続されている第１通電部材と、電極に接続されている第２通電部材と、第１通電部材と第２通電部材の間に配置されている変形部材を備えていてよい。第１通電部材は、中央部が端部に対して窪んでいてよい。第２通電部材は、第１通電部材と間隔をおいて第１通電部材の窪みが設けられている側に対向して配置されていてよい。変形部材は、導電性を有し、端部が第１通電部材の端部に接合されており、中央部が第２通電部材に接触していてよい。上記電流遮断装置では、ケース内の圧力が所定値を超えたときに、変形部材の中央部が第２通電部材から分離して第１通電部材側に移動し、変形部材が第１通電部材の中央部に接触してよい。 The current interrupting device disclosed in the present specification interrupts the energization of the electrode terminal and the electrode when the pressure in the case of the power storage device exceeds a predetermined value. The current interrupting device includes a first current-carrying member connected to the electrode terminal, a second current-carrying member connected to the electrode, and a deformation member disposed between the first current-carrying member and the second current-carrying member. You may be equipped. The first conducting member may have a central portion recessed with respect to the end. The second current-carrying member may be disposed to face the side of the first current-carrying member provided with the recess at a distance from the first current-carrying member. The deformable member may be conductive, and an end thereof may be joined to an end of the first current-carrying member, and a central portion may be in contact with the second current-carrying member. In the above current interrupting device, when the pressure in the case exceeds a predetermined value, the central portion of the deformable member is separated from the second conductive member and moved to the first conductive member side, and the deformable member is the first conductive member. It may touch the central part.
　上記電流遮断装置は、変形部材が第２通電部材から分離して通電が遮断された後、変形部材が第１通電部材の中央部と接触する。より具体的には、変形部材は、第１通電部材の端部に接合された状態で、第１通電部材の中央部に接触する。変形部材が第１通電部材に接触することによって、変形部材の動きが制限され、変形部材と第１通電部材の接合部に加わる力（引張応力）を低減することができる。接合部の破損（部分的、または、全体的に第１通電部材の端部から変形部材が分離すること）を抑制することができる。変形部材の表裏面の圧力差が維持され、変形部材が第２通電部材に再接触することを抑制することができる。そのため、蓄電装置の通電が遮断された後、意図せず蓄電装置が再通電することを抑制することができる。 In the current interrupting device, after the deformation member is separated from the second current-passing member and the current supply is cut off, the deformation member contacts the central portion of the first current-passing member. More specifically, the deformation member contacts the central portion of the first current-carrying member in a state of being joined to the end portion of the first current-carrying member. By the deformation member coming into contact with the first current-carrying member, the movement of the deformation member is limited, and the force (tensile stress) applied to the joint between the deformation member and the first current-carrying member can be reduced. Damage to the joint (partial or total separation of the deformation member from the end of the first current-carrying member) can be suppressed. The pressure difference between the front and back surfaces of the deformation member can be maintained, and the deformation member can be prevented from re-contacting the second current-carrying member. Therefore, it is possible to suppress unintentional re-energization of the power storage device after the power storage device is de-energized.
　なお、変形部材が第２通電部材から分離して通電が遮断された後、変形部材が第１通電部材の中央部と接触しない場合、例えば、第１通電部材に変形部材の変形量（第１通電部材側への突出量）よりも深い窪みが形成されている場合、変形部材が第１通電部材側に最大量突出した後も、変形部材に対して第１通電部材側に突出する力が加わる。その結果、変形部材と第１通電部材の接合部（第１通電部材の端部）が破損することが起こり得る。その結果、変形部材の表裏面（第１通電部材側と第２通電部材側）の圧力差がなくなり、変形部材を第１通電部材側へ突出させる力がなくなる。変形部材が第２通電部材に再接触し、蓄電装置が再通電することが起こり得る。 When the deformable member does not contact the central portion of the first conductive member after the deformable member is separated from the second conductive member and the current is cut off, for example, the deformation amount of the deformable member in the first conductive member (first When a depression deeper than the amount of protrusion to the current-passing member side is formed, the force projecting to the first current-passing member side with respect to the deformable member is large even after the deformable member protrudes the maximum amount to the first current-passing member side Join. As a result, damage may occur to the joint (the end of the first current-carrying member) of the deformation member and the first current-carrying member. As a result, the pressure difference between the front and back surfaces of the deformable member (the first conductive member side and the second conductive member side) disappears, and the force causing the deformable member to protrude toward the first conductive member disappears. It is possible that the deformation member re-contacts the second current-carrying member and the power storage device re-energizes.
　上記電流遮断装置では、第２通電部材に直交する方向において、第１通電部材の中央部から端部までの距離が、変形部材と第１通電部材の接合面から変形部材と第２通電部材の接触面までの距離より小さくてよい。換言すると、第１通電部材に設けられている窪みの深さが、変形部材の中央部の突出高さより小さくてよい。変形部材が第２通電部材から分離して第１通電部材側に突出したときに、変形部材が第１通電部材の中央部に確実に接触する。 In the current interrupting device, in the direction perpendicular to the second current-carrying member, the distance from the central portion to the end of the first current-carrying member is from the joining surface of the deformation member and the first current-carrying member It may be smaller than the distance to the contact surface. In other words, the depth of the depression provided in the first current-carrying member may be smaller than the protruding height of the central portion of the deformation member. When the deformation member separates from the second current-carrying member and protrudes toward the first current-carrying member, the deformation member reliably contacts the central portion of the first current-carrying member.
　上記電流遮断装置では、第１通電部材の中央部にケース外に連通する貫通孔が設けられており、変形部材が第１通電部材の中央部に接触したときに、変形部材が貫通孔を塞いでよい。第１通電部材の中央部に貫通孔を設けることにより、例えば蓄電装置を廃棄するために放電するとき等、意図して変形部材と第２通電部材を再通電させるときに、容易に変形部材を第２通電部材に接触させることができる。また、変形部材が貫通孔を塞ぐことにより、仮に変形部材と第１通電部材の接合部に破損が生じても、変形部材の表裏面の圧力差を維持することができる。すなわち、第１通電部材と変形部材の接合部に破損が生じても、意図せず変形部材が第２通電部材に再接触することを抑制することができる。 In the current interrupting device, a through hole communicating with the outside of the case is provided at the central portion of the first current-passing member, and the deformation member blocks the through-hole when the deforming member contacts the center portion of the first current-passing member. It is good. By providing a through hole at the central portion of the first current-carrying member, for example, when discharging the power storage device, the deformation member can be easily turned on when re-energizing the deformation member and the second current-carrying member. It can be made to contact a 2nd electricity supply member. In addition, since the deformation member closes the through hole, even if breakage occurs in the joint between the deformation member and the first current-carrying member, the pressure difference between the front and back surfaces of the deformation member can be maintained. That is, even if the joint between the first current-carrying member and the deformation member is damaged, it is possible to suppress the re-contact of the deformation member with the second current-supply member without intention.
　上記電流遮断装置では、変形部材の中央部が第１接合部で第２通電部材の中央部に接合されており、変形部材の端部が第２接合部で第１通電部材の端部に接合されており、第１接合部から第２接合部までの長さが、第１接合部と第２接合部を結ぶ直線の長さよりも長くてよい。また、この場合、変形部材は、ケース内の圧力が所定値より小さい通常値のときは、第２通電部材に接合されているとともに、中央部と端部の間の中間部が上記直線よりも第２通電部材側に位置する第１状態であってよい。また、変形部材は、ケース内の圧力が通常値より大きくなると、第２通電部材に接合された状態のまま、中間部が上記直線よりも第１通電部材側に位置する第２状態になってよい。さらに、変形部材は、ケース内の圧力が所定値を超えると、第２通電部材から分離した第３状態になってよい。また、第２状態において、中間部の少なくとも一部が第１通電部材の窪み内に位置するとともに、中間部が第１通電部材の中央部と非接触であってよい。 In the current interrupting device, the central portion of the deformable member is joined to the central portion of the second current-carrying member at the first joint portion, and the end of the deformable member is joined to the end portion of the first conductive member at the second joint portion The length from the first joint to the second joint may be longer than the length of a straight line connecting the first joint and the second joint. Further, in this case, when the pressure in the case is a normal value smaller than the predetermined value, the deformation member is joined to the second current-carrying member, and the middle portion between the center portion and the end portion is more than the straight line. It may be a first state located on the second current-carrying member side. Further, when the pressure in the case becomes larger than the normal value, the deformable member is in the second state in which the intermediate portion is positioned closer to the first conductive member side than the straight line while being joined to the second conductive member. Good. Furthermore, the deformation member may be in a third state separated from the second current-carrying member when the pressure in the case exceeds a predetermined value. In the second state, at least a part of the intermediate portion may be located in the recess of the first current-carrying member, and the intermediate portion may not be in contact with the central portion of the first current-carrying member.
　上記電流遮断装置は、変形部材が第２通電部材から分離して電流が遮断される過程で、変形部材の可動部分（中間部）が第１通電部材と接触することが防止される。変形部材の動きが妨げられないので、設定された圧力（所定値）で変形部材が第２通電部材から分離する。すなわち、設定通りの圧力で電流遮断装置が駆動する。上記電流遮断装置は、ケース内の圧力が上昇し始めてから所定値に至るまでの変形部材の動きに着目し、その動きを妨げないように第１通電部材と変形部材の配置位置を調整することにより、従来よりも信頼性を向上させることができる。 In the current interrupting device, the movable portion (intermediate portion) of the deformable member is prevented from coming into contact with the first conductive member in the process in which the deformable member is separated from the second conductive member and the current is cut off. Since the movement of the deformation member is not impeded, the deformation member is separated from the second current-carrying member at the set pressure (predetermined value). That is, the current interrupter is driven at the set pressure. The current interrupting device pays attention to the movement of the deformation member from when the pressure in the case starts to increase to a predetermined value, and adjusts the arrangement positions of the first current-carrying member and the deformation member so as not to impede the movement. Thus, the reliability can be improved more than in the past.
　変形部材が上記第１～第３状態に変形する電流遮断装置では、変形部材の中央部は、第２通電部材の第１通電部側の表面と平行であってよい。また、第１接合部は、変形部材の中央部の外周より内側に設けられていてよい。この場合、第１通電部材の窪みの深さが、第２状態において、変形部材の中間部の中点が第１通電部材の中央部と非接触となるように規定されていてよい。 In the current interrupting device in which the deformable member is deformed into the first to third states, the central portion of the deformable member may be parallel to the surface of the second conductive member on the side of the first conductive portion. In addition, the first joint portion may be provided inside the outer periphery of the central portion of the deformation member. In this case, the depth of the recess of the first current-carrying member may be defined such that, in the second state, the middle point of the intermediate portion of the deformable member is not in contact with the central portion of the first current-carrying member.
　上記電流遮断装置は、変形部材の中央部と第２通電部材の中央部が平行に配置されるため、変形部材と第２通電部材の接合を容易に行うことができる。また、第１接合部（変形部材と第２通電部材が接合される部分）が変形部材の中央部の外周より内側に設けられるため、変形部材と第２通電部材を接合する際に両者の位置合わせを高度に制御することなく、両者が平行に配置される部分（第１接合部）で両者を接合することができる。なお、変形部材の中央部が第２通電部材に平行であり、変形部材の中央部の外周より内側で変形部材と第２通電部材が接合される場合、変形部材は、中央部の外周部分（中央部と中間部の境界部分）で折曲がった形状となる。この場合、変形部材が第２状態になったときに、中間部分の中点が第２通電部材の表面から最も離れた場所に位置する。すなわち、中間部分の中点が、最も第１通電部材側に突出する。第２状態において中間部の中点が第１通電部材の中央部に接触しないようにすれば、変形部材が第１通電部材側に突出するときに、変形部材の動きが邪魔されることを確実に防止することができる。 Since the said current interruption apparatus arrange | positions the center part of a deformation member and the center part of a 2nd electricity supply member in parallel, joining of a deformation member and a 2nd electricity supply member can be performed easily. In addition, since the first joint portion (the portion where the deformation member and the second conduction member are joined) is provided inside the outer periphery of the central portion of the deformation member, the positions of the two when joining the deformation member and the second conduction member It is possible to join the two at a portion (first joint) in which both are disposed in parallel without highly controlling the alignment. When the central portion of the deformation member is parallel to the second current-carrying member and the deformation member and the second current-carrying member are joined inside the outer periphery of the central portion of the deformation member, the deformation member is It has a bent shape at the boundary between the central part and the middle part. In this case, when the deformation member is in the second state, the middle point of the intermediate portion is located farthest from the surface of the second current-carrying member. That is, the middle point of the middle portion protrudes most toward the first current-carrying member. If the middle point of the intermediate portion is not in contact with the central portion of the first current-carrying member in the second state, it is ensured that the motion of the deforming member is impeded when the deforming member protrudes toward the first current-carrying member. Can be prevented.
　本明細書で開示する他の電流遮断装置は、蓄電装置のケース内の圧力が所定値を超えたときに電極端子と電極の通電を遮断する。この電流遮断装置は、電極端子に接続されている第１通電部材と、電極に接続されている第２通電部材と、第１通電部材と前記第２通電部材の間に配置されている変形部材を備えていてよい。第１通電部材は、第１中央部と第１端部を有していてよい。第１中央部は、第１端部に対して窪んでいてよい。第２通電部材は、第１通電部材と間隔をおいて第１通電部材に対向して配置されていてよい。第２通電部材は、第２中央部と第２端部を有していてよい。第２中央部は、変形部材と接合していてよい。第２端部は、電極に接続していてよい。変形部材は、導電性を有し、第１通電部材と第２通電部材の双方に接続されていてよい。変形部材の第１接合部から第２接合部までの長さは、第１接合部と第２接合部を結ぶ直線の長さよりも長くてよい。変形部材は、ケース内の圧力に応じて第１状態～第３状態に切替わってよい。変形部材は、ケース内の圧力が所定値より小さい通常値のときは、第３中央部が第２通電部材に接合されているとともに、第３中央部と第３端部の間の中間部が上記直線よりも第２通電部材側に位置する第１状態であってよい。また、変形部材は、ケース内の圧力が通常値より大きくなると、第３中央部が第２通電部材に接合された状態のまま、中間部が上記直線よりも第１通電部材側に位置する第２状態になってよい。さらに、変形部材は、ケース内の圧力が所定値を超えると、第３中央部が第２通電部材から分離した第３状態になってよい。上記電流遮断装置では、第２状態において、中間部の一部が、第１端部に囲まれた窪み内に位置するとともに第１中央部と非接触であってよい。 Another current interrupting device disclosed in the present specification interrupts the energization of the electrode terminal and the electrode when the pressure in the case of the power storage device exceeds a predetermined value. The current interrupting device includes a first current-carrying member connected to the electrode terminal, a second current-carrying member connected to the electrode, and a deformable member disposed between the first current-carrying member and the second current-carrying member. May be provided. The first current-carrying member may have a first central portion and a first end. The first central portion may be recessed relative to the first end. The second current-carrying member may be disposed to face the first current-carrying member at an interval from the first current-carrying member. The second current-carrying member may have a second central portion and a second end. The second central portion may be in contact with the deformation member. The second end may be connected to the electrode. The deformation member may have conductivity and be connected to both the first current-carrying member and the second current-carrying member. The length from the first joint to the second joint of the deformable member may be longer than the length of a straight line connecting the first joint and the second joint. The deformable member may be switched from the first state to the third state according to the pressure in the case. When the pressure in the case is a normal value smaller than the predetermined value, the third central portion of the deformation member is joined to the second current-carrying member, and the intermediate portion between the third central portion and the third end is The first state may be located closer to the second conductive member than the straight line. Further, when the pressure in the case becomes larger than the normal value, the deformable member is positioned such that the intermediate portion is closer to the first current-passing member side than the straight line while the third central portion is joined to the second current-passing member. It may be in 2 state. Furthermore, the deformation member may be in a third state in which the third central portion is separated from the second current-carrying member when the pressure in the case exceeds a predetermined value. In the current interrupting device, in the second state, a part of the middle part may be located in the recess surrounded by the first end and not in contact with the first center part.
　さらに、上記他の電流遮断装置において、第３中央部は、第２通電部材の第１通電部側の表面と平行であってよい。また、第１接合部は、第３中央部の外周より内側に設けられていてよい。この場合、第２状態において、中間部の中央が第１中央部と非接触となるように、第１中央部の窪みの深さが調整されていてよい。 Furthermore, in the other current interrupting device, the third central portion may be parallel to the surface of the second current-carrying member on the side of the first current-carrying portion. In addition, the first bonding portion may be provided inside the outer periphery of the third central portion. In this case, in the second state, the depth of the depression of the first central portion may be adjusted such that the center of the intermediate portion is not in contact with the first central portion.
　上記他の電流遮断装置においても、変形部材が第２通電部材から分離して電流が遮断される過程で、変形部材の可動部分（中間部）が第１通電部材と接触することが防止される。 Also in the other current interrupting device, the movable portion (intermediate portion) of the deformation member is prevented from coming into contact with the first conduction member in the process of the deformation member being separated from the second conduction member and the current being cut off. .
電流遮断装置を備えた蓄電装置の断面図を示す。1 shows a cross-sectional view of a power storage device provided with a current interrupting device. 図１の破線ＩＩで囲った範囲であり、電流遮断装置の断面図を示す。It is the range enclosed with the broken line II of FIG. 1, and shows sectional drawing of an electric current interruption apparatus. ケース内の圧力が上昇したときの電流遮断装置の断面図を示す。Fig. 6 shows a cross-sectional view of the current interrupting device when the pressure in the case rises. ケース内の圧力が上昇し、所定圧を超えたときの電流遮断装置の断面図を示す。The pressure in a case rises and sectional drawing of an electric current interruption apparatus when exceeding predetermined pressure is shown. 電流遮断装置の動作を説明するための簡略図を示す。Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device. 電流遮断装置の動作を説明するための簡略図を示す。Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device. 電流遮断装置の動作を説明するための簡略図を示す。Fig. 2 shows a simplified diagram for explaining the operation of the current interrupting device.
　まず、蓄電装置１００の構成部品について、請求の範囲に記載の用語との対応を説明する。負極接続端子７は第１通電部材の一例であり、変形板２０は変形部材の一例であり、破断板３０は第２通電部材の一例である。突出部９９で囲まれた範囲は第１中央部の一例であり、突出部９９は第１端部の一例である。中央部３１は第２中央部の一例であり、外周部３２は第２端部の一例である。中央部２１は第３中央部の一例であり、外周部２２は第３端部の一例である。溶接部４０は第１接合部の一例であり、溶接部９１は第２接合部の一例である。 First, regarding components of power storage device 100, the correspondence with terms in the claims will be described. The negative electrode connection terminal 7 is an example of a first current-carrying member, the deformation plate 20 is an example of a deformation member, and the breaking plate 30 is an example of a second current-carrying member. The range surrounded by the protrusion 99 is an example of the first central portion, and the protrusion 99 is an example of the first end. The central portion 31 is an example of a second central portion, and the outer peripheral portion 32 is an example of a second end. The central portion 21 is an example of a third central portion, and the outer peripheral portion 22 is an example of a third end. The weld 40 is an example of a first joint, and the weld 91 is an example of a second joint.
　図１を参照し、蓄電装置１００について説明する。蓄電装置１００は、二次電池であり、電流遮断装置１０を備えている。蓄電装置１００は、ケース１と、ケース１に収容された電極組立体３と、ケース１に固定された正極接続端子５及び負極接続端子７を備えている。なお、以下の説明では、正極接続端子５及び負極接続端子７を併せて、電極接続端子５，７と称することがある。ケース１は、金属製であり、略直方体形状の箱型部材である。ケース１の内部には、電極組立体３と電流遮断装置１０が収容されている。電極組立体３は、電極接続端子５，７に電気的に接続されている。電流遮断装置１０は、電極組立体３と負極接続端子７の間に配置されている。なお、ケース１の内部は、電解液が注入されており、大気が除去されている。また、電極組立体３は、電解液に浸漬している。 Power storage device 100 will be described with reference to FIG. Power storage device 100 is a secondary battery, and includes current interrupt device 10. The storage device 100 includes a case 1, an electrode assembly 3 housed in the case 1, and a positive electrode connection terminal 5 and a negative electrode connection terminal 7 fixed to the case 1. In the following description, the positive electrode connection terminal 5 and the negative electrode connection terminal 7 may be collectively referred to as electrode connection terminals 5 and 7. The case 1 is made of metal and is a box-shaped member having a substantially rectangular parallelepiped shape. An electrode assembly 3 and a current interrupting device 10 are housed inside the case 1. The electrode assembly 3 is electrically connected to the electrode connection terminals 5 and 7. The current interrupting device 10 is disposed between the electrode assembly 3 and the negative electrode connection terminal 7. In the inside of the case 1, an electrolytic solution is injected, and the air is removed. Moreover, the electrode assembly 3 is immersed in the electrolyte solution.
　ケース１は、本体１１１と、本体１１１に固定された蓋部１１２を備えている。蓋部１１２は、本体１１１の上部を覆っている。蓋部１１２には、取付孔８１，８２が設けられている。正極接続端子５は、取付孔８１を介してケース１の内外に通じている。負極接続端子７は、取付孔８２を介してケース１の内外に通じている。 The case 1 includes a main body 111 and a lid 112 fixed to the main body 111. The lid 112 covers the top of the main body 111. The lid 112 is provided with mounting holes 81 and 82. The positive electrode connection terminal 5 communicates with the inside and the outside of the case 1 through the mounting hole 81. The negative electrode connection terminal 7 communicates with the inside and the outside of the case 1 through the mounting hole 82.
　電極組立体３は、正極電極と負極電極とセパレータを備えている（図示省略）。セパレータは、正極電極と負極電極の間に配置されている。電極組立体３は、正極電極、負極電極及びセパレータからなる積層体（単位セル）が複数積層された構造を有している。複数の正極電極の各々は、正極集電部材と、正極集電部材上に形成されている正極活物質層を備えている。正極集電部材の一例として、アルミニウム箔が挙げられる。また、複数の負極電極の各々は、負極集電部材と、負極集電部材上に形成されている負極活物質層を備えている。負極集電部材の一例として、銅箔が挙げられる。また、電極組立体３は、正極電極毎に設けられた正極集電タブ５１と、負極電極毎に設けられた負極集電タブ５２を備えている。正極集電タブ５１は、正極電極の上端部（電極組立体３の蓋部１１２側の端部）に設けられている。負極集電タブ５２は、負極電極の上端部に設けられている。正極集電タブ５１及び負極集電タブ５２は、電極組立体３の上方（蓋部１１２側）に突出している。複数の正極集電タブ５１は、１つに纏められて正極リード５３に接続されている。複数の負極集電タブ５２は、１つに纏められて負極リード５４に接続されている。 The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator (not shown). The separator is disposed between the positive electrode and the negative electrode. The electrode assembly 3 has a structure in which a plurality of laminates (unit cells) including a positive electrode, a negative electrode, and a separator are stacked. Each of the plurality of positive electrodes includes a positive current collecting member and a positive electrode active material layer formed on the positive current collecting member. An aluminum foil is mentioned as an example of a positive electrode current collection member. Further, each of the plurality of negative electrodes includes a negative electrode current collecting member and a negative electrode active material layer formed on the negative electrode current collecting member. A copper foil is mentioned as an example of a negative electrode current collection member. The electrode assembly 3 further includes a positive electrode current collecting tab 51 provided for each positive electrode and a negative electrode current collecting tab 52 provided for each negative electrode. The positive electrode current collection tab 51 is provided on the upper end of the positive electrode (the end on the lid 112 side of the electrode assembly 3). The negative electrode current collection tab 52 is provided at the upper end of the negative electrode. The positive electrode current collection tab 51 and the negative electrode current collection tab 52 protrude above the electrode assembly 3 (the lid 112 side). The plurality of positive electrode current collection tabs 51 are collected into one and connected to the positive electrode lead 53. The plurality of negative electrode current collection tabs 52 are put together and connected to the negative electrode lead 54.
　正極リード５３は、正極集電タブ５１と正極接続端子５に接続されている。正極リード５３を介して、正極集電タブ５１と正極接続端子５が電気的に接続されている。正極リード５３とケース１の間に、絶縁部材７０が配置されている。絶縁部材７０は、正極リード５３とケース１（蓋部１１２）を絶縁している。 The positive electrode lead 53 is connected to the positive electrode current collection tab 51 and the positive electrode connection terminal 5. The positive electrode current collection tab 51 and the positive electrode connection terminal 5 are electrically connected via the positive electrode lead 53. An insulating member 70 is disposed between the positive electrode lead 53 and the case 1. The insulating member 70 insulates the positive electrode lead 53 and the case 1 (the lid 112).
　負極リード５４は、負極集電タブ５２と接続端子５６に接続されている。接続端子５６は、電流遮断装置１０を介して負極接続端子７に電気的に接続されている。すなわち、負極リード５４、接続端子５６及び電流遮断装置１０を介して、負極集電タブ５２と負極接続端子７が電気的に接続されている。これにより、電極組立体３と負極接続端子７を接続する通電経路が形成されている。電流遮断装置１０は、この通電経路を遮断することができる。電流遮断装置１０の詳細については後述する。負極リード５４とケース１の間に、絶縁部材７１が配置されている。絶縁部材７１は、負極リード５４とケース１（蓋部１１２）を絶縁している。 The negative electrode lead 54 is connected to the negative electrode current collection tab 52 and the connection terminal 56. The connection terminal 56 is electrically connected to the negative electrode connection terminal 7 via the current interrupting device 10. That is, the negative electrode current collection tab 52 and the negative electrode connection terminal 7 are electrically connected via the negative electrode lead 54, the connection terminal 56 and the current interrupting device 10. As a result, a conduction path connecting the electrode assembly 3 and the negative electrode connection terminal 7 is formed. The current interrupting device 10 can interrupt this current path. Details of the current interrupting device 10 will be described later. An insulating member 71 is disposed between the negative electrode lead 54 and the case 1. The insulating member 71 insulates the negative electrode lead 54 and the case 1 (the lid 112).
　蓋部１１２の上面（ケース１の外部）に、樹脂製のガスケット６２，６３が配置されている。ガスケット６２，６３は、絶縁性を有している。ガスケット６２は、正極接続端子５に固定されている。また、正極外部端子（金属プレート）６０が、ガスケット６２の上面に配置されている。正極外部端子６０には、貫通孔６０ａが形成されている。貫通孔６０ａは、上面側に比べ、下面側のサイズが大きくなっている。ガスケット６２は、蓋部１１２と正極外部端子６０を絶縁している。ボルト６４が、貫通孔６０ａを通過している。具体的には、ボルト６４の頭部が、貫通孔６０ａ内に収容されている。また、ボルト６４の軸部が、貫通孔６０ａを通って正極外部端子６０の上方に突出している。正極接続端子５、正極外部端子６０及びボルト６４は、電気的に接続されており、正極端子を構成している。 Gaskets 62 and 63 made of resin are disposed on the upper surface of the lid 112 (outside of the case 1). The gaskets 62 and 63 have insulating properties. The gasket 62 is fixed to the positive electrode connection terminal 5. In addition, a positive electrode external terminal (metal plate) 60 is disposed on the upper surface of the gasket 62. A through hole 60 a is formed in the positive electrode external terminal 60. The size of the lower surface side of the through hole 60a is larger than that of the upper surface side. The gasket 62 insulates the lid 112 and the positive electrode external terminal 60. The bolt 64 passes through the through hole 60a. Specifically, the head of the bolt 64 is accommodated in the through hole 60a. Further, the shaft portion of the bolt 64 protrudes above the positive electrode external terminal 60 through the through hole 60 a. The positive electrode connection terminal 5, the positive electrode external terminal 60, and the bolt 64 are electrically connected to form a positive electrode terminal.
　ガスケット６３は、負極接続端子７に固定されている。負極外部端子（金属プレート）６１が、ガスケット６３の上面に配置されている。負極外部端子６１には、正極外部端子６０の貫通孔６０ａと同様の貫通孔６１ａが形成されている。貫通孔６１ａ内にボルト６５の頭部が収容され、ボルト６５の軸部が貫通孔６１ａを通って負極外部端子６１の上方に突出している。ガスケット６３、負極外部端子６１及びボルト６５の構成は、上述したガスケット６２、正極外部端子６０及びボルト６４の構成と同様である。負極接続端子７、負極外部端子６１及びボルト６５は、電気的に接続されており、負極端子を構成している。 The gasket 63 is fixed to the negative electrode connection terminal 7. A negative electrode external terminal (metal plate) 61 is disposed on the upper surface of the gasket 63. In the negative electrode external terminal 61, a through hole 61a similar to the through hole 60a of the positive electrode external terminal 60 is formed. The head portion of the bolt 65 is accommodated in the through hole 61 a, and the shaft portion of the bolt 65 protrudes above the negative electrode external terminal 61 through the through hole 61 a. The configurations of the gasket 63, the negative electrode external terminal 61, and the bolt 65 are the same as the configurations of the gasket 62, the positive electrode external terminal 60, and the bolt 64 described above. The negative electrode connection terminal 7, the negative electrode external terminal 61, and the bolt 65 are electrically connected, and constitute a negative electrode terminal.
　図２から図４を参照し、電流遮断装置１０について説明する。図２は、ケース１内の圧力が通常範囲内の値であり、電流遮断装置１０が作動していない状態を示している。図３は、ケース１内の圧力が通常範囲を超えて上昇したときの電流遮断装置１０の状態を示している。なお、図３は、電流遮断装置１０が作動する前の（電極組立体３と負極接続端子７が通電している）状態を示している。図４は、ケース１内の圧力が所定値を超え、電流遮断装置１０が作動した後の状態を示している。以下の説明では、図２の状態を第１状態、図３の状態を第２状態、図４の状態を第３状態と称することがある。 The current interrupting device 10 will be described with reference to FIGS. 2 to 4. FIG. 2 shows a state in which the pressure in the case 1 is within the normal range and the current interrupting device 10 is not operating. FIG. 3 shows the state of the current interrupting device 10 when the pressure in the case 1 rises beyond the normal range. FIG. 3 shows a state before the current interrupting device 10 operates (the electrode assembly 3 and the negative electrode connection terminal 7 are energized). FIG. 4 shows a state after the pressure in the case 1 exceeds a predetermined value and the current interrupting device 10 operates. In the following description, the state of FIG. 2 may be referred to as a first state, the state of FIG. 3 as a second state, and the state of FIG. 4 as a third state.
　図２に示すように、電流遮断装置１０は、負極接続端子７と、破断板３０と、変形板２０と、ホルダ８０を備えている。負極接続端子７は、蓋部１１２にかしめ固定されている。負極接続端子７は、かしめ部品（かしめ端子）である。負極接続端子７は、円筒部９４、基部９５及び固定部９６を備えている。円筒部９４は、取付孔８２を通過している。また、円筒部９４は、貫通孔９７を備えている。基部９５は環状であり、円筒部９４の下端に固定されている。基部９５は、ケース１の内部に配置されている。基部９５は、蓋部１１２に沿って広がる平面を有している。基部９５の面方向端部に、下方（電極組立体３側）に突出する突出部９９が設けられている。 As shown in FIG. 2, the current interrupting device 10 includes a negative electrode connection terminal 7, a breaking plate 30, a deformation plate 20, and a holder 80. The negative electrode connection terminal 7 is fixed to the lid 112 by caulking. The negative electrode connection terminal 7 is a caulking component (a caulking terminal). The negative electrode connection terminal 7 includes a cylindrical portion 94, a base 95, and a fixing portion 96. The cylindrical portion 94 passes through the mounting hole 82. The cylindrical portion 94 also has a through hole 97. The base 95 is annular and fixed to the lower end of the cylindrical portion 94. The base 95 is disposed inside the case 1. The base 95 has a flat surface extending along the lid 112. At the end in the plane direction of the base 95, a protrusion 99 is provided which protrudes downward (toward the electrode assembly 3).
　基部９５には、窪み９８が形成されている。具体的には、基部９５の面方向端部に設けられた突出部９９に対して、突出部９９で囲まれた範囲（基部９５の中央部）が窪んでいる。窪み９８の底面の中央に、貫通孔９７が位置している。窪み９８と貫通孔９７は連通している。そのため、窪み９８内の空間１２は、貫通孔９７を介して、ケース１外と連通している。空間１２は、大気圧に保たれる。固定部９６は、円筒部９４の上端に固定されている。固定部９６はケース１の外部に配置されている。負極接続端子７は、固定部９６によってケース１（蓋部１１２）に固定されている。 The base 95 is formed with a recess 98. Specifically, the range (the central portion of the base 95) surrounded by the projecting portion 99 is recessed with respect to the projecting portion 99 provided at the end in the surface direction of the base 95. At the center of the bottom of the recess 98, the through hole 97 is located. The recess 98 and the through hole 97 communicate with each other. Therefore, the space 12 in the recess 98 communicates with the outside of the case 1 through the through hole 97. Space 12 is maintained at atmospheric pressure. The fixing portion 96 is fixed to the upper end of the cylindrical portion 94. The fixing portion 96 is disposed outside the case 1. The negative electrode connection terminal 7 is fixed to the case 1 (lid part 112) by the fixing part 96.
　破断板３０は、金属製であり、導電性を有している。破断板３０は、平面視において円形である。破断板３０は、基部９５に対向する位置に配置されている。破断板３０は、基部９５（負極接続端子７）と直接接しておらず、基部９５と間隔をおいて配置されている。すなわち、破断板３０は、基部９５と間隔をおいて（基部９５と非接触な状態で）、基部９５の窪み９８が設けられている側（基部９５の下方）に配置されている。破断板３０は、変形板２０を介して基部９５に接続されている。破断板３０は、中央部３１及び外周部３２を有している。中央部３１に変形板２０が接合されている。破断板３０の上面（変形板２０側の表面）は、中央部３１から外周部３２にかけてほぼ平坦である。それに対して、破断板３０の下面（変形板２０と反対側の表面）は、外周部３２に対して中央部３１が窪んでいる。そのため、中央部３１の厚みは、外周部３２の厚みより薄い。破断溝３３が、破断板３０の下面に設けられている。破断溝３３は、破断板３０の中央部３１と外周部３２の間に設けられている。そのため、破断板３０では、破断溝３３より外側（外周部３２）の厚みが、破断溝３３より内側（中央部３１）の厚みより厚い。破断板３０の外周部３２には、接続端子５６が接続されている。すなわち、破断板３０は、接続端子５６を介して負極電極に接続されている。 The fracture plate 30 is made of metal and has conductivity. The fracture plate 30 is circular in plan view. The breaking plate 30 is disposed at a position facing the base 95. The fracture plate 30 is not in direct contact with the base 95 (the negative electrode connection terminal 7), and is disposed at a distance from the base 95. That is, the breaking plate 30 is disposed on the side of the base 95 provided with the recess 98 (below the base 95) at a distance from the base 95 (in a non-contact state with the base 95). The fracture plate 30 is connected to the base 95 via the deformation plate 20. The rupture plate 30 has a central portion 31 and an outer peripheral portion 32. The deformation plate 20 is joined to the central portion 31. The upper surface (the surface on the deformation plate 20 side) of the fracture plate 30 is substantially flat from the central portion 31 to the outer peripheral portion 32. On the other hand, in the lower surface (surface opposite to the deformation plate 20) of the fracture plate 30, the central portion 31 is recessed with respect to the outer peripheral portion 32. Therefore, the thickness of the central portion 31 is thinner than the thickness of the outer peripheral portion 32. The breaking groove 33 is provided on the lower surface of the breaking plate 30. The fracture groove 33 is provided between the central portion 31 and the outer circumferential portion 32 of the fracture plate 30. Therefore, in the fracture plate 30, the thickness of the outer side (outer peripheral part 32) of the fracture groove 33 is thicker than the thickness of the inner side (central part 31) of the fracture groove 33. The connection terminal 56 is connected to the outer peripheral portion 32 of the fracture plate 30. That is, the fracture plate 30 is connected to the negative electrode through the connection terminal 56.
　破断板３０は、ホルダ８０に支持されている。ホルダ８０は、ポリフェニレンサルファイド（ＰＰＳ）樹脂で形成されている。ホルダ８０は、負極接続端子７の基部９５を囲むように、ケース１内に配置されている。ホルダ８０は、上部７９及び下部７８を有している。上部７９は、ケース１の蓋部１１２に沿って広がる平面を有している。上部７９の中央に貫通孔７９ａが設けられている。負極接続端子７の円筒部９４は、貫通孔７９ａを通過している。上部７９は、ケース１の蓋部１１２と、負極接続端子７の基部９５の間に配置されている。ホルダ８０は、負極接続端子７とともに、ケース１に固定されている。すなわち、ホルダ８０は、負極接続端子７に固定されている。ホルダ８０は、絶縁性を有している。ホルダ８０は、ケース１（蓋部１１２）と負極接続端子７（基部９５）を絶縁している。 The fracture plate 30 is supported by the holder 80. The holder 80 is formed of polyphenylene sulfide (PPS) resin. The holder 80 is disposed in the case 1 so as to surround the base 95 of the negative electrode connection terminal 7. The holder 80 has an upper portion 79 and a lower portion 78. The upper portion 79 has a flat surface extending along the lid 112 of the case 1. A through hole 79 a is provided at the center of the upper portion 79. The cylindrical portion 94 of the negative electrode connection terminal 7 passes through the through hole 79a. The upper portion 79 is disposed between the lid 112 of the case 1 and the base 95 of the negative electrode connection terminal 7. The holder 80 is fixed to the case 1 together with the negative electrode connection terminal 7. That is, the holder 80 is fixed to the negative electrode connection terminal 7. The holder 80 has an insulating property. The holder 80 insulates the case 1 (the lid 112) and the negative electrode connection terminal 7 (the base 95).
　ホルダ８０の下部７８は、上部７９の外周縁から下方に伸びている。ホルダ８０の下部７８は、負極接続端子７の基部９５（突出部９９）の下端より下方まで伸びている。基部９５は、下部７８の内側に配置されている。破断板３０は、接続層７５を介してホルダ８０の下端に固定されている。接続層７５は、破断板３０及びホルダ８０の双方に溶着している。破断板３０をホルダ８０の下端に固定することにより、負極接続端子７（基部９５）と破断板３０は、直接接触することなく接続される。すなわち、ホルダ８０は、負極接続端子７と破断板３０を、両者の間隔を維持した状態で接続している。また、ホルダ８０は、下端の一部が窪んでおり、破断板３０の一部と接触していない。そのため、ホルダ８０と破断板３０の間の一部に、連通孔７７が形成されている。 The lower portion 78 of the holder 80 extends downward from the outer peripheral edge of the upper portion 79. The lower portion 78 of the holder 80 extends below the lower end of the base 95 (projecting portion 99) of the negative electrode connection terminal 7. The base 95 is disposed inside the lower portion 78. The fracture plate 30 is fixed to the lower end of the holder 80 via the connection layer 75. The connection layer 75 is welded to both the breaking plate 30 and the holder 80. By fixing the breaking plate 30 to the lower end of the holder 80, the negative electrode connection terminal 7 (base 95) and the breaking plate 30 are connected without direct contact. That is, the holder 80 connects the negative electrode connection terminal 7 and the breaking plate 30 in a state in which the distance between them is maintained. In addition, a part of the lower end of the holder 80 is recessed and is not in contact with a part of the breaking plate 30. Therefore, a communication hole 77 is formed in a part between the holder 80 and the breaking plate 30.
　変形板２０は、導電性を有するダイアフラムである。変形板２０は、負極接続端子７の下方に配置されている。より具体的には、変形板２０は、負極接続端子７（基部９５）と破断板３０の間に配置されている。変形板２０は、中央部２１及び外周部（端部）２２を有している。中央部２１は、破断板３０の上面（変形板２０側の表面）と平行である。中央部２１は、破断板３０の上面と面接触している。中央部２１の外周２１ａより内側で、中央部２１と破断板３０が接合（溶接）されている。具体的には、変形板２０の溶接部４０が、破断板の中央部３１に溶接されている。溶接部４０は、破断溝３３より内側に設けられている。変形板２０は、破断板３０の厚みが薄い部分（中央部３１）に接合されている。 The deformation plate 20 is a conductive diaphragm. The deformation plate 20 is disposed below the negative electrode connection terminal 7. More specifically, the deformation plate 20 is disposed between the negative electrode connection terminal 7 (base 95) and the breaking plate 30. The deformation plate 20 has a central portion 21 and an outer peripheral portion (end portion) 22. The central portion 21 is parallel to the upper surface (the surface on the deformation plate 20 side) of the fracture plate 30. The central portion 21 is in surface contact with the upper surface of the fracture plate 30. The central portion 21 and the fracture plate 30 are joined (welded) inside the outer periphery 21 a of the central portion 21. Specifically, the welded portion 40 of the deformation plate 20 is welded to the central portion 31 of the fracture plate. The welding portion 40 is provided on the inner side than the fracture groove 33. The deformation plate 20 is joined to the thin portion (central portion 31) of the fracture plate 30.
　外周部２２は、負極接続端子７（突出部９９）の下面と平行である。外周部２２は、負極接続端子７の下面と面接触している。外周部２２の全体が、負極接続端子７に接合（溶接）されている。すなわち、外周部２２の全体が溶接部９１を構成している。なお、外周部２２は、全周に亘って負極接続端子７に接合されている。 The outer peripheral portion 22 is parallel to the lower surface of the negative electrode connection terminal 7 (projecting portion 99). The outer peripheral portion 22 is in surface contact with the lower surface of the negative electrode connection terminal 7. The entire outer peripheral portion 22 is joined (welded) to the negative electrode connection terminal 7. That is, the entire outer peripheral portion 22 constitutes a welded portion 91. The outer peripheral portion 22 is joined to the negative electrode connection terminal 7 over the entire circumference.
　中央部２１と外周部２２の間に中間部２３が設けられている。換言すると、中間部２３が、中央部２１と外周部２２を接続している。変形板２０は、負極接続端子７と破断板３０の双方に接合されている。溶接部４０，９１間における変形板の長さ（中間部２３の長さと溶接部４０の外側の中央部２１の長さの合計）は、溶接部４０と溶接部９１を結ぶ直線の長さ（溶接部４０，９１間の最短距離）より長い。また、中間部２３は、溶接部４０と溶接部９１を結ぶ直線より下方（破断板３０側）に位置している。そのため、中間部２３は、下方に凸となっている。変形板２０は、全体として下方に凸となっており、中間部２３も下方に凸となっている。 An intermediate portion 23 is provided between the central portion 21 and the outer peripheral portion 22. In other words, the intermediate portion 23 connects the central portion 21 and the outer peripheral portion 22. The deformation plate 20 is joined to both the negative electrode connection terminal 7 and the breaking plate 30. The length of the deformed plate between the welds 40 and 91 (the sum of the length of the middle part 23 and the length of the central part 21 outside the weld 40) is the length of the straight line connecting the weld 40 and the weld 91 ( The shortest distance between welds 40, 91). In addition, the intermediate portion 23 is located below the straight line connecting the welding portion 40 and the welding portion 91 (the fracture plate 30 side). Therefore, the middle portion 23 is convex downward. The deformation plate 20 is convex downward as a whole, and the middle portion 23 is also convex downward.
　上記したように、変形板２０の外周部２２は、全周に亘って負極接続端子７に接合されている。そのため、変形板２０は、変形板２０の上部の空間１２と下部の空間１４を区画している。空間１２は、貫通孔９７を介してケース１外の空間と連通している。よって、空間１２の圧力は大気圧である。また、上記したように、ホルダ８０と破断板３０の間の一部に連通孔７７が形成されている。連通孔７７は、変形板２０と破断板３０の間の空間１４と、ケース１内空間（電流遮断装置１０外の空間）を連通している。よって、空間１４の圧力は、ケース１内空間の圧力である。 As described above, the outer peripheral portion 22 of the deformation plate 20 is joined to the negative electrode connection terminal 7 over the entire circumference. Therefore, the deformation plate 20 divides the space 12 at the upper part of the deformation plate 20 and the space 14 at the lower part. The space 12 communicates with the space outside the case 1 through the through hole 97. Thus, the pressure of the space 12 is atmospheric pressure. Further, as described above, the communication hole 77 is formed in a part between the holder 80 and the breaking plate 30. The communication hole 77 communicates the space 14 between the deformation plate 20 and the breaking plate 30 with the space in the case 1 (the space outside the current interrupting device 10). Therefore, the pressure of the space 14 is the pressure of the space in the case 1.
　図２から図４を参照し、電流遮断装置１０の動作について説明する。蓄電装置１００は、ケース１内の圧力が所定値以下のときは、負極接続端子７と負極集電タブ５２が電流遮断装置１０を介して電気的に接続している。すなわち、負極接続端子７と負極電極の間が通電している。ケース１内の圧力が所定値を超えると、電流遮断装置１０が、負極接続端子７と負極集電タブ５２の通電を遮断し、蓄電装置１００に電流が流れることを防止する。具体的には、ケース１内の圧力が通常値（所定値より小さい圧力）のときは、図２に示すように、中央部２１が破断板３０に接合された状態で、変形板２０が下方に凸となっている。また、ケース１内の圧力が通常値のときは、中間部２３も下方に凸となっている（第１状態）。 The operation of the current interrupting device 10 will be described with reference to FIGS. 2 to 4. In the power storage device 100, when the pressure in the case 1 is equal to or less than a predetermined value, the negative electrode connection terminal 7 and the negative electrode current collection tab 52 are electrically connected via the current interrupting device 10. That is, current is supplied between the negative electrode connection terminal 7 and the negative electrode. When the pressure in the case 1 exceeds a predetermined value, the current interrupting device 10 interrupts the energization of the negative electrode connection terminal 7 and the negative electrode current collecting tab 52 to prevent the current from flowing to the power storage device 100. Specifically, when the pressure in the case 1 is a normal value (pressure smaller than a predetermined value), as shown in FIG. 2, the deformation plate 20 is downward with the central portion 21 joined to the rupture plate 30. It is convex. Further, when the pressure in the case 1 is a normal value, the intermediate portion 23 is also convex downward (first state).
　ケース１内の圧力が上昇すると、空間１４の圧力が上昇し、変形板２０の下面にケース１内の圧力が作用する。一方、変形板２０の上面には大気圧が作用する。変形板２０の上面と下面に圧力差が生じる。そのため、図３に示すように、変形板２０は、中央部２１が破断板３０に接合された状態で（全体としては下方に凸のままで）、溶接部４０と溶接部９１の間が上方に凸となる。中間部２３は、溶接部４０と溶接部９１を結ぶ直線より上方（負極接続端子７側）に位置する（第２状態）。なお、第２状態では、中間部２３の上方端（最も負極接続端子７側に位置する部分）が、窪み９８内（突出部９９で囲まれた範囲の空間）に位置している。また、中間部２３は、負極接続端子７（基部９５）に接触していない。 When the pressure in the case 1 rises, the pressure in the space 14 rises, and the pressure in the case 1 acts on the lower surface of the deformation plate 20. On the other hand, atmospheric pressure acts on the upper surface of the deformation plate 20. A pressure difference occurs between the upper and lower surfaces of the deformation plate 20. Therefore, as shown in FIG. 3, the deformed plate 20 is such that the portion between the welding portion 40 and the welding portion 91 is upward in a state in which the central portion 21 is joined to the fracture plate 30 (as a whole, remains convex downward). Be convex. The intermediate portion 23 is located above (on the negative electrode connection terminal 7 side) the straight line connecting the welding portion 40 and the welding portion 91 (second state). In the second state, the upper end of the intermediate portion 23 (the portion closest to the negative electrode connection terminal 7) is located in the recess 98 (a space in a range surrounded by the projecting portion 99). Further, the intermediate portion 23 is not in contact with the negative electrode connection terminal 7 (base 95).
　ケース１内の圧力がさらに上昇して所定値を超えると、変形板２０の下面に作用する圧力もさらに上昇し、破断板３０が破断溝３３を起点として破断する。そのため、図４に示すように、変形板２０の中央部２１が上方に移動し、変形板２０（中央部２１）が破断板３０から分離する（第３状態）。より具体的には、破断板３０の中央部３１が、変形板２０の中央部２１と接合したまま、破断板３０の外周部３２から分離する。電極組立体３（負極電極）は、接続端子５６を介して破断板３０の外周部３２に接続されている。破断板３０の中央部３１が外周部３２から分離すると、破断板３０と変形板２０の通電経路が遮断され、電極組立体３（負極電極）と負極接続端子７が非通電状態となる。蓄電装置１００の電極端子間（正極端子と負極端子）に流れる電流が遮断される。第３状態では、変形板２０の中央部２１が上方（基部９５側）に移動し、変形板２０が全体として上方に凸となっており、中間部２３も上方に凸となっている。また、第３状態では、変形板２０が負極接続端子７（基部９５）の下面に接触し、貫通孔９７を塞いでいる。 When the pressure in the case 1 further rises and exceeds a predetermined value, the pressure acting on the lower surface of the deformation plate 20 also further rises, and the breaking plate 30 is broken starting from the breaking groove 33. Therefore, as shown in FIG. 4, the central portion 21 of the deformation plate 20 moves upward, and the deformation plate 20 (central portion 21) separates from the fracture plate 30 (third state). More specifically, the central portion 31 of the breaking plate 30 separates from the outer peripheral portion 32 of the breaking plate 30 while being joined to the central portion 21 of the deformation plate 20. The electrode assembly 3 (negative electrode) is connected to the outer peripheral portion 32 of the fracture plate 30 via the connection terminal 56. When the central portion 31 of the fracture plate 30 is separated from the outer circumferential portion 32, the conduction path of the fracture plate 30 and the deformation plate 20 is cut off, and the electrode assembly 3 (negative electrode) and the negative electrode connection terminal 7 become non-energized. The current flowing between the electrode terminals (positive electrode terminal and negative electrode terminal) of power storage device 100 is cut off. In the third state, the central portion 21 of the deformation plate 20 moves upward (the base 95 side), and the deformation plate 20 is convex upward as a whole, and the middle portion 23 is also convex upward. In the third state, the deformation plate 20 is in contact with the lower surface of the negative electrode connection terminal 7 (the base 95) to close the through hole 97.
　図５から図７を参照し、第１～第３状態における各部品（負極接続端子７，破断板３０，変形板２０）の位置関係をさらに詳しく説明する。図５は第１状態を示し、図６は第２状態を示し、図７は第３状態を示している。なお、図５～図７は、各部品の形状を簡略化して示している。また、図５～図７は、各部品の位置関係を明確に示すため、各部品の間隔等を実際よりも大きく示している。 With reference to FIGS. 5 to 7, the positional relationship of each component (negative electrode connection terminal 7, fracture plate 30, deformation plate 20) in the first to third states will be described in more detail. FIG. 5 shows the first state, FIG. 6 shows the second state, and FIG. 7 shows the third state. 5 to 7 show the shape of each part in a simplified manner. Further, FIGS. 5 to 7 show the intervals between the parts or the like larger than the actual ones in order to clearly show the positional relationship between the parts.
　図５に示すように、突出部９９は、基部９５から距離９９ｈ突出している。具体的には、破断板３０に直交する方向において、突出部９９の下面から窪み９８の表面（基部９５の下面）までの距離は距離９９ｈである。換言すると、基部９５には、距離９９ｈの深さの窪み９８が形成されている。突出部９９の下面（変形板２０の外周部２２と負極接続端子７との接合面）から破断板３０の表面（変形板２０の中央部２１と破断板３０の接触面）までの距離は距離２０ｈである。そのため、第１状態における変形板２０の下方への突出高さは、距離２０ｈである。距離９９ｈは、距離２０ｈより小さい。そのため、第１状態において、変形板２０の突出高さは、窪み９８の深さより大きい。換言すると、窪み９８の深さ（距離９９ｈ）は、第１状態における変形板２０の突出高さ（距離２０ｈ）より小さい。なお、図５から明らかなように、第１状態では、中間部２３及び中央部２１（溶接部４０より外側部分）は、溶接部４０と溶接部９１を結ぶ直線１８より下方に位置している。なお、点２５は、中間部２３の中点を示している。 As shown in FIG. 5, the protrusion 99 protrudes a distance 99 h from the base 95. Specifically, in the direction orthogonal to the fracture plate 30, the distance from the lower surface of the protrusion 99 to the surface of the recess 98 (the lower surface of the base 95) is a distance 99h. In other words, the base 95 is formed with a recess 98 having a depth of 99 h. The distance from the lower surface of the projection 99 (the joint surface between the outer peripheral portion 22 of the deformation plate 20 and the negative electrode connection terminal 7) to the surface of the breaking plate 30 (the contact surface between the central portion 21 of the deformation plate 20 and the breaking plate 30) is a distance It is 20h. Therefore, the downward projecting height of the deformation plate 20 in the first state is a distance 20 h. The distance 99h is smaller than the distance 20h. Therefore, in the first state, the protrusion height of the deformation plate 20 is larger than the depth of the recess 98. In other words, the depth (distance 99 h) of the recess 98 is smaller than the protruding height (distance 20 h) of the deformation plate 20 in the first state. As is clear from FIG. 5, in the first state, the intermediate portion 23 and the central portion 21 (portion outside the weld portion 40) are located below the straight line 18 connecting the weld portion 40 and the weld portion 91. . The point 25 indicates the middle point of the middle portion 23.
　図６に示すように、第２状態では、溶接部４０，９１間の変形板２０が、上方に反転する。すなわち、変形板２０が、溶接部４０，９１を支点として反転する。このときに、中間部２３の中点（点２５）が、最も大きく変位する。すなわち、中間部２３の中点が、最も上方に位置する。突出部９９の下面に対する点２５の高さは、距離２５ｈである。距離２５ｈは、距離９９ｈより小さい。すなわち、中間部２３の中点が、基部９５と非接触となるように、距離９９ｈが規定されている。そのため、第２状態において、変形板２０の変形する部分（溶接部４０，９１間）は、負極接続端子７に接触しない。なお、距離２５ｈは、突出部９９と破断板３０の距離（距離２０ｈ）と、中間部２３の長さと、中央部２１の長さと、中央部２１における溶接部４０の位置によって一義的に決定する。 As shown in FIG. 6, in the second state, the deformation plate 20 between the welds 40 and 91 is inverted upward. That is, the deformation plate 20 is reversed with the welds 40 and 91 as a fulcrum. At this time, the middle point (point 25) of the middle portion 23 is displaced the most. That is, the middle point of the middle portion 23 is positioned at the top. The height of the point 25 with respect to the lower surface of the protrusion 99 is a distance 25 h. The distance 25h is smaller than the distance 99h. That is, the distance 99 h is defined such that the middle point of the intermediate portion 23 does not contact the base 95. Therefore, in the second state, the deformed portion (between the welds 40 and 91) of the deformation plate 20 does not contact the negative electrode connection terminal 7. The distance 25h is uniquely determined by the distance between the projection 99 and the fracture plate 30 (distance 20h), the length of the intermediate portion 23, the length of the central portion 21, and the position of the welded portion 40 in the central portion 21. .
　図７に示すように、第３状態では、破断板３０の中央部３１が破断し、変形板２０が上方に反転する。変形板２０が上方に突出する。上記したように、第１状態において、変形板２０の突出高さ（下方への突出高さ）は、窪み９８の深さより大きい。そのため、変形板２０が上方に突出すると、変形板２０が窪み９８の表面（基部９５の下面）に接触する。また、変形板２０によって、貫通孔９７が塞がれる。 As shown in FIG. 7, in the third state, the central portion 31 of the breaking plate 30 is broken, and the deformation plate 20 is inverted upward. The deformation plate 20 projects upward. As described above, in the first state, the projection height (the projection height downward) of the deformation plate 20 is larger than the depth of the recess 98. Therefore, when the deformation plate 20 projects upward, the deformation plate 20 contacts the surface of the recess 98 (the lower surface of the base 95). In addition, the through hole 97 is closed by the deformation plate 20.
　電流遮断装置１０の利点を説明する。上記したように、蓄電装置１００では、ケース１内の圧力が上昇すると、変形板２０の下面にケース１内の圧力が作用し、変形板２０が反転し、変形板２０が破断板３０から分離することによって通電を遮断する。変形板２０は、所定の圧力で反転するように設計される。そのため、例えば変形板２０の受圧面積が変化すると、変形板２０の反転圧力（電流遮断装置１０の作動圧）が設計値からずれることが起こり得る。変形板２０が破断板３０から分離する過程で変形板２０の可動部分（変形し得る部分）が他の部品に接触すると、変形板２０の可動部分の面積が減少し、実質的な変形板２０の受圧面積が減少し、変形板２０の反転圧力が設計値からずれることが起こり得る。上記したように、電流遮断装置１０は、ケース１内の圧力が上昇してから所定値に達するまでの間（第２状態）、変形板２０の可動部分が他の部品に接触しない。そのため、変形板２０の反転圧力が設計値からずれることを抑制できる。 The advantages of the current interrupt device 10 will be described. As described above, in the storage device 100, when the pressure in the case 1 rises, the pressure in the case 1 acts on the lower surface of the deformation plate 20, the deformation plate 20 is reversed, and the deformation plate 20 is separated from the breaking plate 30 Shut off the power supply. The deformation plate 20 is designed to invert at a predetermined pressure. Therefore, for example, when the pressure receiving area of the deformation plate 20 changes, the reverse pressure of the deformation plate 20 (the operating pressure of the current interrupting device 10) may deviate from the design value. When the movable portion (deformable portion) of the deformation plate 20 contacts another part in the process of separating the deformation plate 20 from the fracture plate 30, the area of the movable portion of the deformation plate 20 is reduced, and the substantial deformation plate 20 is substantially reduced. It is possible that the pressure receiving area of the pressure plate decreases and the reversal pressure of the deformation plate 20 deviates from the design value. As described above, in the current interrupting device 10, the movable portion of the deformation plate 20 does not contact other components while the pressure in the case 1 increases and reaches a predetermined value (second state). Therefore, it is possible to suppress the reverse pressure of the deformation plate 20 from deviating from the design value.
　また、蓄電装置１００では、変形板２０が破断板３０から分離した後、変形板２０が負極接続端子７に接触する。例えば変形板２０が破断板３０から分離した後に他の部品と接触しない場合、変形板２０の下面にケース１内の圧力が作用し続けるため、溶接部９１に引張応力が作用し続ける。その結果、溶接部９１が破損することが起こり得る。あるいは、変形板２０が破損することが起こり得る。溶接部９１及び／又は変形板２０が破損すると、変形板２０の上部の空間１２と下部の空間１４を区画することができなくなる。換言すると、ケース１内をシールすることができなくなる。そのため、溶接部９１及び／又は変形板２０が破損すると、変形板２０が下方（破断板３０側）に移動し、変形板２０が破断板３０に再接触することが起こり得る。蓄電装置１００では、変形板２０が負極接続端子７に接触することにより、溶接部９１及び／又は変形板２０の破損が抑制され、変形板２０の上部と下部の圧力差を維持することができる。変形板２０が下方に移動することが防止され、蓄電装置１００が再通電することを防止することができる。 Further, in power storage device 100, after deformation plate 20 is separated from breaking plate 30, deformation plate 20 contacts negative electrode connection terminal 7. For example, when the deformation plate 20 is separated from the fracture plate 30 and does not contact with other parts, the pressure in the case 1 continues to act on the lower surface of the deformation plate 20, and tensile stress continues to act on the welded portion 91. As a result, breakage of the welded portion 91 may occur. Alternatively, breakage of the deformation plate 20 may occur. When the welding portion 91 and / or the deformation plate 20 is broken, the space 12 at the upper portion of the deformation plate 20 and the space 14 at the lower portion can not be divided. In other words, the inside of the case 1 can not be sealed. Therefore, when the welding portion 91 and / or the deformation plate 20 is broken, the deformation plate 20 may move downward (to the fracture plate 30 side), and the deformation plate 20 may come into contact with the fracture plate 30 again. In storage device 100, deformation plate 20 is in contact with negative electrode connection terminal 7, whereby breakage of welded portion 91 and / or deformation plate 20 is suppressed, and the pressure difference between the upper and lower portions of deformation plate 20 can be maintained. . The deformation plate 20 is prevented from moving downward, and the power storage device 100 can be prevented from reenergizing.
　上記実施例では、変形板２０の中央部２１が破断板３０に接合（溶接）されている例について説明した。しかしながら、変形板２０は、必ずしも破断板３０に接合されていなくてもよい。ケース１内の圧力が通常値のときに、変形板２０の中央部２１が破断板３０と接触していればよい。なお、中央部２１が破断板３０に接合されない場合、破断溝３３を省略してもよく、また、破断板３０の中央部３１と外周部３２の厚みが同一であってもよい。すなわち、負極電極に接続される部材（第２通電部材）と変形板２０が接合されない場合、第２通電部材は表裏面が平坦な板状であってよい。 In the above embodiment, an example in which the central portion 21 of the deformation plate 20 is joined (welded) to the fracture plate 30 has been described. However, the deformation plate 20 may not necessarily be joined to the breaking plate 30. The central portion 21 of the deformation plate 20 may be in contact with the breaking plate 30 when the pressure in the case 1 is a normal value. In addition, when the center part 21 is not joined to the fracture | rupture board 30, the fracture | rupture groove | channel 33 may be abbreviate | omitted, and the thickness of the center part 31 of the fracture | rupture board 30 and the outer peripheral part 32 may be the same. That is, when the member connected to the negative electrode (the second current-carrying member) and the deformation plate 20 are not joined, the second current-carrying member may have a flat plate shape with flat front and back surfaces.
　なお、上記実施例では、負極電極と負極端子の通電経路上に電流遮断装置を配置する例について説明した。しかしながら、電流遮断装置は、正極電極と正極端子の通電経路上に配置してもよいし、負極電極と負極端子の通電経路上及び正極電極と正極端子の通電経路上の双方に配置してもよい。 In the above embodiment, the example in which the current interrupting device is disposed on the current path of the negative electrode and the negative electrode terminal has been described. However, the current interrupting device may be disposed on the conduction path of the positive electrode and the positive terminal, or may be disposed on both the conduction path of the negative electrode and the negative terminal and on the conduction path of the positive electrode and the positive terminal. Good.
　以上、本明細書に開示の技術の具体例を詳細に説明したが、これらは例示にすぎず、請求の範囲を限定するものではない。請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。また、本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時請求項記載の組合せに限定されるものではない。 The specific examples of the technology disclosed in the present specification have been described above in detail, but these are merely examples and do not limit the scope of the claims. The art set forth in the claims includes various variations and modifications of the specific examples illustrated above. The technical elements described in the present specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing.

Claims (9)

  1. 　蓄電装置のケース内の圧力が所定値を超えたときに電極端子と電極の通電を遮断する電流遮断装置であって、
    　前記電極端子に接続されているとともに、中央部が端部に対して窪んでいる第１通電部材と、
    　前記第１通電部材と間隔をおいて前記第１通電部材の窪みが設けられている側に対向して配置されているとともに、前記電極に接続されている第２通電部材と、
    　前記第１通電部材と前記第２通電部材の間に配置されているとともに、導電性を有し、端部が前記第１通電部材の端部に接合されており、中央部が前記第２通電部材に接触している変形部材と、を備えており、
    　前記ケース内の圧力が所定値を超えたときに、前記変形部材の中央部が前記第２通電部材から分離して前記第１通電部材側に移動し、前記変形部材が前記第１通電部材の中央部に接触する、電流遮断装置。     A current interrupting device for interrupting energization of an electrode terminal and an electrode when the pressure in the case of the storage device exceeds a predetermined value,
    A first conductive member connected to the electrode terminal and having a central portion recessed with respect to the end portion;
    A second current-carrying member disposed opposite to the side of the first current-carrying member provided with a recess at a distance from the first current-carrying member and connected to the electrode;
    While being arrange | positioned between the said 1st electricity supply member and the said 2nd electricity supply member, it has electroconductivity and the edge part is joined to the edge part of the said 1st electricity supply member, A center part is said 2nd electricity supply And a deforming member in contact with the member;
    When the pressure in the case exceeds a predetermined value, the central portion of the deformable member is separated from the second conductive member and moved to the first conductive member side, and the deformable member is the first conductive member. A current interrupter that contacts the center.
  2. 　前記第２通電部材に直交する方向において、前記第１通電部材の中央部から端部までの距離が、前記変形部材と前記第１通電部材の接合面から前記変形部材と前記第２通電部材の接触面までの距離より小さい請求項１に記載の電流遮断装置。 In the direction orthogonal to the second current-carrying member, the distance from the center to the end of the first current-carrying member is the distance between the deformation member and the first current-carrying member from the joint surface of the deformation member and the second current-carrying member The current interrupting device according to claim 1, which is smaller than the distance to the contact surface.
  3. 　前記第１通電部材の中央部に前記ケース外に連通する貫通孔が設けられており、
    　前記変形部材が前記第１通電部材の中央部に接触したときに、前記変形部材が前記貫通孔を塞ぐ請求項１又は２に記載の電流遮断装置。     A through hole communicating with the outside of the case is provided at a central portion of the first current-carrying member,
    The current interrupting device according to claim 1, wherein the deformation member closes the through hole when the deformation member contacts a central portion of the first current-carrying member.
  4. 　前記変形部材の中央部が第１接合部で前記第２通電部材の中央部に接合されており、
    　前記変形部材の端部が第２接合部で前記第１通電部材の端部に接合されており、
    　前記第１接合部から前記第２接合部までの長さが、前記第１接合部と前記第２接合部を結ぶ直線の長さよりも長く、
    　前記変形部材は、
    　前記ケース内の圧力が前記所定値より小さい通常値のときは、第２通電部材に接合されているとともに、中央部と端部の間の中間部が前記直線よりも前記第２通電部材側に位置する第１状態であり、
    　前記ケース内の圧力が前記通常値より大きくなると、第２通電部材に接合された状態のまま、前記中間部が前記直線よりも前記第１通電部材側に位置する第２状態になり、
    　前記ケース内の圧力が前記所定値を超えると、前記第２通電部材から分離した第３状態になり、
    　前記第２状態において、前記中間部の少なくとも一部が前記第１通電部材の窪み内に位置するとともに、前記中間部が前記第１通電部材の中央部と非接触である請求項１から３のいずれか一項に記載の電流遮断装置。     The central portion of the deformation member is joined to the central portion of the second current-carrying member at a first joint portion,
    The end of the deformation member is joined to the end of the first current-carrying member at a second joint,
    The length from the first joint to the second joint is longer than the length of a straight line connecting the first joint and the second joint,
    The deformation member is
    When the pressure in the case is a normal value smaller than the predetermined value, the case is joined to the second current-carrying member, and the middle portion between the central portion and the end is closer to the second current-carrying member than the straight line. It is the first state to be located,
    When the pressure in the case becomes larger than the normal value, the intermediate portion is in the second state in which the intermediate portion is positioned closer to the first current-passing member side than the straight line while being joined to the second current-passing member.
    When the pressure in the case exceeds the predetermined value, a third state separate from the second current-carrying member is established,
    4. In the second state, at least a part of the intermediate portion is positioned in the recess of the first current-carrying member, and the intermediate portion is not in contact with the central portion of the first current-carrying member. A current interrupting device according to any one of the preceding claims.
  5. 　前記変形部材の中央部は、前記第２通電部材の前記第１通電部側の表面と平行であり、
    　前記第１接合部は、前記変形部材の中央部の外周より内側に設けられており、
    　前記第１通電部材の窪みの深さが、前記第２状態において前記中間部の中点が前記第１通電部材の中央部と非接触となるように規定されている請求項４に記載の電流遮断装置。     The central portion of the deformation member is parallel to the surface of the second current-carrying member on the side of the first current-carrying portion,
    The first joint portion is provided inside the outer periphery of the central portion of the deformation member,
    The current according to claim 4, wherein the depth of the recess of the first current-carrying member is defined such that the middle point of the intermediate portion does not contact the central portion of the first current-carrying member in the second state. Shut-off device.
  6. 　蓄電装置のケース内の圧力が所定値を超えたときに電極端子と電極の通電を遮断する電流遮断装置であって、
    　前記電極端子に接続されている第１通電部材と、
    　前記第１通電部材と間隔をおいて前記第１通電部材に対向して配置されているとともに、前記電極に接続されている第２通電部材と、
    　前記第１通電部材と前記第２通電部材の間に配置されているとともに、導電性を有し、前記第１通電部材と前記第２通電部材の双方に接続されている変形部材と、を備えており、
    　前記第１通電部材は、第１中央部と第１端部を有しており、前記第１中央部が前記第１端部に対して窪んでおり、
    　前記第２通電部材は、第２中央部と第２端部を有しており、前記第２中央部が前記変形部材と接合しているとともに前記第２端部が前記電極に接続しており、
    　前記変形部材は、第３中央部と第３端部を有しており、前記第３中央部の第１接合部が前記第２中央部に接合されているとともに前記第３端部の第２接合部が前記第１端部に接合されており、前記第１接合部から前記第２接合部までの長さが前記第１接合部と前記第２接合部を結ぶ直線の長さよりも長く、
    　前記変形部材は、
    　　前記ケース内の圧力が前記所定値より小さい通常値のときは、前記第３中央部が前記第２通電部材に接合されているとともに、前記第３中央部と前記第３端部の間の中間部が前記直線よりも前記第２通電部材側に位置する第１状態であり、
    　　前記ケース内の圧力が前記通常値より大きくなると、前記第３中央部が前記第２通電部材に接合された状態のまま、前記中間部が前記直線よりも前記第１通電部材側に位置する第２状態になり、
    　　前記ケース内の圧力が前記所定値を超えると、前記第３中央部が前記第２通電部材から分離した第３状態になり、
    　前記第２状態において、前記中間部の少なくとも一部が前記第１端部に囲まれた窪み内に位置するとともに、前記中間部が前記第１中央部と非接触である、電流遮断装置。     A current interrupting device for interrupting energization of an electrode terminal and an electrode when the pressure in the case of the storage device exceeds a predetermined value,
    A first current-carrying member connected to the electrode terminal;
    A second current-carrying member disposed opposite to the first current-carrying member at a distance from the first current-carrying member and connected to the electrode;
    And a deformation member disposed between the first current-passing member and the second current-passing member and having conductivity and being connected to both the first current-passing member and the second current-passing member. Yes,
    The first current-carrying member has a first central portion and a first end, and the first central portion is recessed with respect to the first end,
    The second current-carrying member has a second center portion and a second end portion, and the second center portion is joined to the deformation member and the second end portion is connected to the electrode. ,
    The deformation member has a third central portion and a third end, and the first joint portion of the third central portion is joined to the second central portion and the second joint of the third end. A joint is joined to the first end, and a length from the first joint to the second joint is longer than a length of a straight line connecting the first joint and the second joint,
    The deformation member is
    When the pressure in the case is a normal value smaller than the predetermined value, the third central portion is joined to the second current-carrying member, and the middle between the third central portion and the third end In the first state where the unit is positioned closer to the second current-carrying member than the straight line,
    When the pressure in the case becomes larger than the normal value, the intermediate portion is positioned closer to the first current-passing member side than the straight line while the third center portion is joined to the second current-passing member. 2 states,
    When the pressure in the case exceeds the predetermined value, the third central portion is in a third state in which it is separated from the second current-carrying member,
    In the second state, at least a portion of the intermediate portion is located in the recess surrounded by the first end, and the intermediate portion is not in contact with the first central portion.
  7. 　前記第３中央部は、前記第２通電部材の前記第１通電部側の表面と平行であり、
    　前記第１接合部は、前記第３中央部の外周より内側に設けられており、
    　前記第２状態において、前記中間部の中点が前記第１中央部と非接触となるように、前記第１中央部の窪みの深さが規定されている請求項６に記載の電流遮断装置。     The third central portion is parallel to a surface of the second conductive member on the first conductive portion side,
    The first joint portion is provided inside the outer periphery of the third central portion,
    The current interrupting device according to claim 6, wherein in the second state, the depth of the depression of the first central portion is defined such that the middle point of the intermediate portion is not in contact with the first central portion. .
  8. 　請求項１から７のいずれか一項に記載の電流遮断装置を備える蓄電装置。 A power storage device comprising the current interrupting device according to any one of claims 1 to 7.
  9. 　前記蓄電装置は、二次電池である請求項８に記載の蓄電装置。
          The power storage device according to claim 8, wherein the power storage device is a secondary battery.
PCT/JP2018/023513 2017-08-04 2018-06-20 Current interrupting device and electricity storage device WO2019026455A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014139904A (en) * 2013-01-21 2014-07-31 Hitachi Vehicle Energy Ltd Square secondary battery
JP2015060751A (en) * 2013-09-19 2015-03-30 トヨタ自動車株式会社 Secondary battery
JP2017216156A (en) * 2016-05-31 2017-12-07 株式会社豊田自動織機 Current cutoff device, power storage device, and method of manufacturing power storage device
JP2018106840A (en) * 2016-12-22 2018-07-05 トヨタ自動車株式会社 Lithium ion secondary battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014139904A (en) * 2013-01-21 2014-07-31 Hitachi Vehicle Energy Ltd Square secondary battery
JP2015060751A (en) * 2013-09-19 2015-03-30 トヨタ自動車株式会社 Secondary battery
JP2017216156A (en) * 2016-05-31 2017-12-07 株式会社豊田自動織機 Current cutoff device, power storage device, and method of manufacturing power storage device
JP2018106840A (en) * 2016-12-22 2018-07-05 トヨタ自動車株式会社 Lithium ion secondary battery

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