WO2013125431A1 - Electrical storage device - Google Patents

Electrical storage device Download PDF

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Publication number
WO2013125431A1
WO2013125431A1 PCT/JP2013/053496 JP2013053496W WO2013125431A1 WO 2013125431 A1 WO2013125431 A1 WO 2013125431A1 JP 2013053496 W JP2013053496 W JP 2013053496W WO 2013125431 A1 WO2013125431 A1 WO 2013125431A1
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WO
WIPO (PCT)
Prior art keywords
lead
case
storage device
end surface
current
Prior art date
Application number
PCT/JP2013/053496
Other languages
French (fr)
Japanese (ja)
Inventor
厚志 南形
元章 奥田
加藤　崇行
聡 梅村
寛恭 西原
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2013125431A1 publication Critical patent/WO2013125431A1/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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 technology disclosed in this specification relates to a power storage device.
  • JP 2010-1113929 A includes a case, an electrode assembly housed in the case, a current collecting tab extending from the electrode assembly toward the end surface of the case, and a current collecting tab and a terminal.
  • a power storage device including a current interrupt device is disclosed.
  • a power storage device When a power storage device is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, it is preferable to further reduce the size of the power storage device itself.
  • the conventional technology when the current collecting tab extending from the electrode assembly, the terminal attached to the end face of the case, and the current interrupting device disposed between the current collecting tab and the terminal are viewed from the end face of the case, , All are arranged to overlap. For this reason, the distance between the end surface to which the terminal of the case is attached and the electrode assembly becomes long, leading to an increase in the size of the power storage device. A technology that can further reduce the size of the power storage device is expected.
  • This specification provides a technique for solving the above problems.
  • a technique capable of further reducing the size of the power storage device is provided.
  • the power storage device includes a case, an electrode assembly housed in the case, a current collecting tab extending from the electrode assembly and disposed between the electrode assembly and the end surface of the case, and a current collecting tab
  • the first lead, the terminal provided on the end surface of the case, the second lead joined to the terminal inside the case, and the first lead and the second lead are provided to conduct current.
  • a current interrupting device capable of changing the amount.
  • the terminal, the current interrupt device, and the current collecting tab are arranged offset from each other.
  • the end portion closer to the end surface of the current collecting tab is arranged at a position closer to the end surface than the end portion far from the end surface of the current interrupt device.
  • the terminal, the current interrupting device, and the current collecting tab by effectively utilizing the space between the end face to which the terminal of the case is attached and the electrode assembly.
  • the distance between the end face to which the terminal of the case is attached and the electrode assembly can be shortened to reduce the size of the power storage device.
  • the power storage device can be further downsized.
  • FIG. 2 is a longitudinal sectional view showing an internal configuration of a power storage device 2.
  • FIG. FIG. 2 is a longitudinal sectional view taken along line AA in FIG.
  • FIG. 3 is a plan view seen from BB in FIG. 1. It is a figure which shows the structure of the electric current interruption apparatus 40 when the internal pressure of case 4 is low. It is a figure which shows the structure of the electric current interruption apparatus 40 in case the internal pressure of case 4 is high. It is an expanded longitudinal cross-sectional view which shows the structure of the electrical storage apparatus 2 of 2nd Example.
  • FIG. 7 is an enlarged longitudinal sectional view of a current interrupting device 41 of a power storage device 2 according to a second embodiment as seen from CC in FIG.
  • FIG. 7 is an enlarged vertical cross-sectional view of the current interrupt device 41 of the power storage device 2 of the second embodiment as seen from CC in FIG.
  • the current collecting tab may be bent and may have a flat portion substantially parallel to the end surface.
  • the terminal of the case can be attached by joining the current collecting tab and the first lead using the flat portion of the current collecting tab as compared with the case where the current collecting tab is straightened.
  • the distance between the end face and the electrode assembly can be shortened.
  • the size of the power storage device can be reduced.
  • an insulating plate is provided on the end surface of the case so that the surface is in contact with the end surface, and the current collecting tab contacts the insulating plate.
  • a current interrupting device is disposed in contact with the insulating plate or in a state in which the second lead is sandwiched between the insulating plate and the insulating plate. Also good.
  • the distance between the end surface of the case and the electrode assembly can be shortened by bringing the current interrupt device and the current collecting tab as close as possible to the end surface of the case.
  • the size of the power storage device can be reduced.
  • At least one of the first lead and the second lead extends to the electrode assembly more than the first flat portion, the first flat portion extending substantially parallel to the end surface of the case.
  • at least a part of the other of the first lead and the second lead may be in contact with an insulating plate that is in contact with the end surface of the case in a state where the surface faces the surface.
  • the distance between the end face to which the terminal of the case is attached and the electrode assembly can be shortened to reduce the size of the power storage device. Moreover, it can prevent that an electric current interruption apparatus and a current collection tab vibrate with respect to a case.
  • the current interrupting device has a conductive diaphragm, and the diaphragm is positioned on the outer peripheral portion and on the inner side of the outer peripheral portion. And a displacement portion that is displaced by the deformation of the diaphragm when the pressure in the case rises, and the outer peripheral edge portion is fixed and electrically connected to one of the first lead and the second lead, and the displacement portion is The first lead and the second lead are fixed and electrically connected to each other, and when the pressure in the case increases, the other of the first lead and the second lead breaks and no current flows. You may be able to.
  • the first lead and the second lead are connected via the diaphragm to form a current interrupt device.
  • the current interrupting device can be configured with a relatively simple configuration.
  • the current interrupt device includes an insulating spacer, one of the first lead and the second lead, the outer peripheral edge of the diaphragm, the spacer, the first lead, and the second lead. And a crimping member that holds the other of the leads in a state of being sequentially stacked.
  • the components of the current interrupt device can be integrated with a relatively simple structure.
  • the power storage device disclosed in this specification may be a secondary battery.
  • FIG. 1 shows a schematic configuration of a power storage device 2 of the present embodiment.
  • the power storage device 2 is a secondary battery such as a nickel metal hydride battery or a lithium ion battery.
  • the power storage device 2 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, and supplies electrodes to a motor that rotates the wheels. In addition, the power storage device 2 is charged with electric power regenerated by the motor.
  • the power storage device 2 includes a case 4, an electrode assembly 6, current collecting tabs 8a and 8b extending from the electrode assembly 6, first leads 10a and 10b, a positive terminal 12a, a negative terminal 12b, A second lead 22 and a current interrupt device 40 are provided.
  • the case 4 is a substantially rectangular parallelepiped box-shaped member, and accommodates the electrode assembly 6, current collecting tabs 8 a and 8 b, the first leads 10 a and 10 b, the second lead 22, and the current interrupt device 40.
  • a positive terminal 12 a and a negative terminal 12 b are provided on the upper end surface of the case 4.
  • the electrode assembly 6 is a wound electrode assembly including active materials and current collectors for positive and negative electrodes, a separator, and the like.
  • a current collecting tab 8a extends from the positive current collector of the electrode assembly 6, and a current collecting tab 8b extends from the negative current collector.
  • the current collecting tab 8 a extends from the electrode assembly 6 toward the upper end surface of the case 4, bends in the middle, and has a flat portion 18 a substantially parallel to the upper end surface of the case 4. Is formed.
  • the current collecting tab 8 b extends from the electrode assembly 6 toward the upper end surface of the case 4, bends in the middle, and has a flat portion 18 b that is substantially parallel to the upper end surface of the case 4. .
  • the first lead 10a is a conductive member having a S-shaped cross section including a first flat surface portion 20a, a second flat surface portion 20b, and a connecting portion 20c.
  • the first flat surface portion 20 a extends substantially parallel to the upper end surface of the case 4.
  • the second planar portion 20b extends substantially parallel to the upper end surface of the case 4 at a position closer to the electrode assembly 6 than the first planar portion 20a.
  • the connection part 20c has connected the 1st plane part 20a and the 2nd plane part 20b.
  • the lower surface of the first flat portion 20a of the first lead 10a and the upper surface of the flat portion 18a of the current collecting tab 8a are in contact, and both are fixed by welding.
  • the first lead 10b is a flat conductive member.
  • the first lead 10 b extends substantially parallel to the upper end surface of the case 4.
  • the lower surface of the first lead 10b is in contact with the upper surface of the flat portion 18b of the current collecting tab 8b, and both are fixed by welding.
  • the second lead 22 is a flat conductive member.
  • the second lead 22 extends substantially parallel to the upper end surface of the case 4.
  • the positive terminal 12a includes a bolt 24a, an inner nut 26a, and an outer nut 28a.
  • a through hole is formed in the upper end surface of the case 4 at a position where the positive electrode terminal 12a is disposed, and an insulating gasket 30a is attached to the through hole.
  • the inner nut 26a passes through a through hole formed in the second lead 22, and is attached to the gasket 30a.
  • the bolt 24a is fastened to the inner nut 26a via the seal washer 32a.
  • the second lead 22 is sandwiched between the inner nut 26a and the gasket 30a.
  • the gasket 30 a includes an extending portion 34 a as an insulating plate that extends in a flat plate shape while contacting the upper end surface of the case 4.
  • the upper surface of the first flat portion 20a of the first lead 10a and the upper surface of the second lead 22 are in contact with the extending portion 34a.
  • the outer nut 28a of the positive terminal 12a is used for connecting the positive terminal 12a
  • the negative electrode terminal 12b includes a bolt 24b, an inner nut 26b, and an outer nut 28b. At the position where the negative electrode terminal 12b is disposed, a through hole is formed in the upper end surface of the case 4, and an insulating gasket 30b is attached to the through hole.
  • the inner nut 26b passes through a through hole formed in the first lead 10b and is attached to the gasket 30b.
  • the bolt 24b is fastened to the inner nut 26b via the seal washer 32b.
  • the first lead 10b is sandwiched between the inner nut 26b and the gasket 30b.
  • the gasket 30 b includes an extending portion 34 b that extends in a flat plate shape while contacting the upper end surface of the case 4.
  • the upper surface of the first lead 10a is in contact with the extending portion 34b.
  • the outer nut 28b of the negative electrode terminal 12b is used for connecting the negative electrode terminal 12b and the wiring member.
  • the first lead 10 a and the second lead 22 are connected via a current interrupt device 40.
  • the positive electrode terminal 12 a, the current interrupt device 40, and the current collecting tab 8 a are arranged so as to be offset from each other when viewed from the upper end surface of the case 4.
  • the current interrupt device 40 includes an end portion of the second flat portion 20 b of the first lead 10 a, an insulating bracket 36 that mechanically fixes the end portion of the second lead 22, and a second A conductive diaphragm 38 is provided that is held by the bracket 36 in contact with the lead 22.
  • the diaphragm 38 can be deformed between a state where it bulges downward as shown in FIG. 4 and a state where it bulges upward as shown in FIG.
  • the diaphragm 38 bulges downward as shown in FIG. 4, the portion bulged downward of the diaphragm 38 abuts on the edge of the opening formed in the second flat portion 20b of the first lead 10a, and the diaphragm 38
  • the first lead 10a and the second lead 22 are electrically connected via each other.
  • the diaphragm 38 bulges upward as shown in FIG. 5
  • the diaphragm 38 is separated from the second flat portion 20b of the first lead 10a, and the first lead 10a and the second lead 22 are electrically insulated.
  • the second lead 22 has an opening so as not to interfere with the bulged portion of the diaphragm 38 when the diaphragm 38 is bulged upward.
  • the current interrupt device 40 When the internal pressure of the case 4 is low, the current interrupt device 40 electrically connects the first lead 10a and the second lead 22 via the diaphragm 38 as shown in FIG. As shown in FIG. 4, the first lead 10a and the second lead 22 are electrically insulated.
  • the current interrupt device 40 can be referred to as an internal pressure detection type current interrupt device.
  • the positive electrode terminal 12a, the current interrupt device 40, and the current collecting tab 8a are arranged offset from each other when viewed in plan from the upper end surface of the case 4. Further, in the power storage device 2 of the present embodiment, the upper end portion of the current collecting tab 8 a is disposed at a position closer to the upper end surface of the case 4 than the lower end portion of the current interrupt device 40.
  • the current collecting tabs 8 a and 8 b are bent in a direction substantially parallel to the upper end surface of the case 4, and flat portions 18 a and 18 b that are substantially parallel to the upper end surface of the case 4 are formed. Is formed.
  • an insulating gasket 30a that abuts on the upper end surface of the case 4 in a state where the surface faces the upper end surface of the case 4 is provided.
  • the current collecting tab 8a is disposed with the first lead 10a sandwiched between the gasket 30a and the current interrupt device 40 is disposed with the second lead 22 sandwiched between the gasket 30a.
  • the current interrupting device 40 and the current collecting tab 8a are brought as close as possible to the upper end surface of the case 4, and the distance between the upper end surface of the case 4 and the electrode assembly 6 is shortened. Can do.
  • the size of the power storage device 2 can be reduced.
  • the first lead 10a extends in a substantially parallel manner to the upper end surface of the case 4, and the case 4 is positioned closer to the electrode assembly 6 than the first flat portion 20a.
  • a second flat surface portion 20b extending substantially parallel to the upper end surface, and a connecting portion 20c for connecting the first flat surface portion 20a and the second flat surface portion 20b are provided, and the first flat surface portion 20a of the first lead 10a and the second lead. 22 is in contact with the extended portion 34a of the insulating gasket 30a that is in contact with the upper end surface of the case 4 in a state in which the surfaces face each other.
  • the power storage device 2 of the second embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the power storage device 2 includes a current interrupt device 41.
  • the current interrupt device 41 is an internal pressure detection type current interrupt device.
  • the power storage device 2 according to the second embodiment has a first lead 50 and a second lead 52. As shown in FIG. 6, the lower surface of the right end of FIG. 6 of the first lead 50 is in contact with the upper surface of the flat portion 18a of the current collecting tab 8a, and both are fixed by welding.
  • the second lead 52 is a flat conductive member. The second lead 52 extends substantially parallel to the upper end surface of the case 4. The left end of the second lead 52 in FIG. 6 is sandwiched between the inner nut 26a and the gasket 30a.
  • the end of the first lead 50 on the left side in FIG. 6 and the end of the second lead 52 on the right side in FIG. 6 are connected via a current interrupt device 41. Similar to the power storage device 2 of the first embodiment, the positive electrode terminal 12 a, the current interrupt device 41, and the current collecting tab 8 a are arranged offset from each other when viewed from the upper end surface of the case 4.
  • FIG. 7 shows a state when the internal pressure of the case 4 of the current interrupt device 41 is low.
  • the current interrupt device 41 includes a conductive diaphragm 68 and an insulating spacer 66.
  • the spacer 66 has an annular shape having an opening at the center, and is arranged concentrically with the diaphragm 68.
  • an insulating material such as rubber can be used.
  • a metal surface with an insulating resin coating can be used.
  • the second lead 52, the outer peripheral edge 71 located on the outer peripheral portion of the diaphragm 68, the spacer 66, and the first lead 50 are stacked in order (from top to bottom in FIG. 7).
  • the outer peripheral edge 71 of the diaphragm 68 and the second lead 52 are welded and electrically connected. By welding, the space surrounded by the diaphragm 68 and the second lead 52 is kept airtight.
  • the second lead 52, the outer peripheral edge 71 of the diaphragm 68, the spacer 66, and the first lead 50, which are overlapped, are sandwiched by the crimping member 69c via the insulating sheet 67c.
  • the caulking member 69 c is insulated from the first lead 50, the diaphragm 68, and the second lead 52 by the insulating sheet 67 c.
  • the outer peripheral edge 71 of the diaphragm 68 and the first lead 50 are insulated by a spacer 66.
  • the upper end of the caulking member 69c is fixed to the extending portion 34a extending from the insulating gasket 30a described above.
  • the diaphragm 68 bulges downward (FIG. 7).
  • the lower surface (the lower surface of the central portion 72 of the diaphragm 68) that bulges below the diaphragm 68 and the upper surface of the first lead 50 are welded, and the diaphragm 68 and the first lead 50 are electrically connected. ing.
  • the second lead 52, the diaphragm 68, and the first lead 50 are electrically connected in order to form an energization path.
  • the lower surface of the diaphragm 68 receives the pressure of the space in which the electrode assembly 6 of the case 4 is accommodated.
  • the upper surface of the diaphragm 68 receives the pressure of the space surrounded by the second lead 52 and the diaphragm 68.
  • the space surrounded by the second lead 52 and the diaphragm 68 is isolated from the space that houses the electrode assembly 6 of the case 4.
  • a fragile portion 51 is formed on the lower surface of the first lead 50.
  • the fragile portion 51 is formed in an arc shape so as to surround a range where the diaphragm 68 and the first lead 50 are welded.
  • the fragile portion 51 is a groove having a triangular cross section and is formed by engraving.
  • the inner portion of the fragile portion 51 is a moving-side conductive portion 53
  • the outer portion of the fragile portion 51 is a fixed-side conductive portion 54.
  • the diaphragm 68 When the internal pressure of the case 4 rises, as shown in FIG. 8, the diaphragm 68 is deformed, and parts other than the outer peripheral edge 71 are displaced upward in FIG.
  • the central portion 72 of the diaphragm 68 is displaced most greatly.
  • the central portion 72 of the diaphragm 68 is an example of the “displacement portion” in the claims.
  • the central portion 72 of the diaphragm 68 and the moving-side conductive portion 53 are integrally moved and moved upward, and the first lead 50 is broken at the fragile portion 51.
  • the movement-side conductive portion 53 and the fixed-side conductive portion 54 are separated, so that no current flows in a path connecting the second lead 52, the diaphragm 68, and the first lead 50 in this order.
  • the first lead 50 and the second lead 52 are connected only through the diaphragm 68.
  • the current interrupting device 41 can be configured with a relatively simple configuration.
  • the second lead 52 and the outer peripheral edge 71 of the diaphragm 68 are welded to form a space isolated from the space in which the electrode assembly 6 is accommodated. For this reason, the isolated space can be formed with a relatively simple configuration.
  • the first lead 50 is an integral conductive member in a state before breaking.
  • reed 50 can be reduced and the electrical resistance of the electrical storage apparatus 2 is reduced as a result. be able to.
  • the second lead 52, the outer peripheral edge 71 of the diaphragm 68, the spacer 66, and the first lead 50 are integrated by a caulking member 69c. For this reason, these components can be integrated with a relatively simple structure.
  • the second lead 52 and the outer peripheral edge portion 71 of the diaphragm 68 are welded, the first lead 50 and the center portion 72 of the diaphragm 68 are welded, and the first lead 50 is weakened. 51 was formed, and the outer peripheral edge 71 and the first lead 50 were insulated by the spacer 66.
  • the first lead 50 and the outer peripheral edge portion 71 of the diaphragm 68 are welded, the second lead 52 and the central portion 72 of the diaphragm 68 are welded, and the weakened portion 51 is formed on the second lead 52.
  • the second lead 52 may be insulated by the spacer 66.
  • the case 4 is a substantially rectangular parallelepiped box-shaped member, but the case 4 may be a substantially cylindrical box-shaped member, for example.
  • the electrode assembly 6 is a wound type has been described, but the electrode assembly 6 may be a laminated type.
  • first lead 10a has an S-shaped cross section including the first flat surface portion 20a, the second flat surface portion 20b, and the connecting portion 20c, and the second lead 22 has a flat plate shape
  • the second lead 22 may have an S-shaped cross section
  • the first lead 10a may have a flat plate shape.
  • the flat portion 18a of the first lead 10a is sandwiched between the flat portion 18a of the current collecting tab 8a and the extending portion 34a of the gasket 30a.
  • the flat portion 18a may be brought into contact with the extending portion 34a, and the first flat portion 20a may be brought into contact with the lower side of the flat portion 18a.
  • the flat portion 18a may be brought into contact with the extending portion 34a, and the first flat portion 20a may be inserted into the flat portion 18a.
  • the current interrupting device 40 is an internal pressure detection type current interrupting device that switches between conduction and non-conduction according to the internal pressure of the case 4 . It may be a temperature detection type current interrupting device that switches between conduction and non-conduction of current according to the internal temperature, and current conduction and non-conduction according to the applied voltage between the positive terminal 12a and the negative terminal 12b. It may be a voltage detection type current interrupting device for switching between.
  • the current interrupt device 40 is not only a device that completely interrupts current conduction when protecting the power storage device 2, but also uses, for example, an element capable of changing the amount of current conduction, such as a PTC element, to store the power storage device 2. When the current is protected, the current conduction amount may be reduced to substantially cut off the current conduction.
  • the power storage device 2 is mounted and used in a vehicle such as a hybrid vehicle or an electric vehicle has been described.
  • the power storage device 2 may be used for other purposes.

Abstract

The present description discloses an electrical storage device. This electrical storage device is provided with: a case; an electrode assembly accommodated in the case; a current collector tab that extends from the electrode assembly, and is positioned between the electrode assembly and an end surface of the case; a first lead that is joined to the current collector tab; a terminal that is provided on the end surface of the case; a second lead that is joined to the terminal at the inner side of the case; and a current interrupting device that is provided between the first lead and the second lead, and can alter the amount of current conducted. In this electrical storage device, the terminal, current interrupting device, and current collector tab are positioned in a mutually offset manner from the end surface of the case when seen in plan view. In this electrical storage device, the end section of the current collector tab that is at the near side thereof from the end surface is positioned in a location that is closer to the end surface than the end section of the current interrupting device that is at the far side thereof from the end surface.

Description

蓄電装置Power storage device
　本明細書に開示の技術は、蓄電装置に関する。 The technology disclosed in this specification relates to a power storage device.
　ハイブリッド自動車や電気自動車の普及に伴い、これらの車両に搭載する蓄電装置の利用が拡大している。これらの蓄電装置には、蓄電装置の内圧が異常に上昇した場合などに、端子と電極組立体の間の電流を遮断する、電流遮断装置が組み込まれることがある。特開２０１０－１１３９２９号公報には、ケースと、ケースに収容された電極組立体と、電極組立体からケースの端面に向けて伸びる集電タブと、集電タブと端子の間に設けられた電流遮断装置を備える蓄電装置が開示されている。 With the spread of hybrid vehicles and electric vehicles, the use of power storage devices mounted on these vehicles is expanding. These power storage devices may incorporate a current interrupting device that interrupts the current between the terminal and the electrode assembly when the internal pressure of the power storage device abnormally increases. JP 2010-1113929 A includes a case, an electrode assembly housed in the case, a current collecting tab extending from the electrode assembly toward the end surface of the case, and a current collecting tab and a terminal. A power storage device including a current interrupt device is disclosed.
　ハイブリッド自動車や電気自動車等の車両に蓄電装置を搭載して使用する場合、蓄電装置そのものをより小型化することが好ましい。従来の技術では、電極組立体から伸びる集電タブと、ケースの端面に取り付けられた端子と、集電タブと端子の間に配置される電流遮断装置が、ケースの端面から平面視したときに、全て重なり合うように配置されている。このため、ケースの端子が取り付けられる端面と電極組立体の間の距離が長くなってしまい、蓄電装置のサイズの大型化を招いている。蓄電装置をより小型化することが可能な技術が期待されている。 When a power storage device is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, it is preferable to further reduce the size of the power storage device itself. In the conventional technology, when the current collecting tab extending from the electrode assembly, the terminal attached to the end face of the case, and the current interrupting device disposed between the current collecting tab and the terminal are viewed from the end face of the case, , All are arranged to overlap. For this reason, the distance between the end surface to which the terminal of the case is attached and the electrode assembly becomes long, leading to an increase in the size of the power storage device. A technology that can further reduce the size of the power storage device is expected.
　本明細書は上記課題を解決する技術を提供する。本明細書では、蓄電装置をより小型化することが可能な技術を提供する。 This specification provides a technique for solving the above problems. In the present specification, a technique capable of further reducing the size of the power storage device is provided.
　本明細書は、蓄電装置を開示する。その蓄電装置は、ケースと、ケースに収容された電極組立体と、電極組立体から延在し、電極組立体とケースの端面との間に配置された集電タブと、集電タブと接合された第１リードと、ケースの端面に設けられた端子と、ケースの内側で端子と接合された第２リードと、第１リードと第２リードとの間に設けられており、電流の導電量を変更可能な電流遮断装置とを備えている。その蓄電装置では、ケースの端面から平面視したときに、端子と電流遮断装置と集電タブとが互いにオフセットして配置されている。その蓄電装置では、集電タブの端面から近い側の端部が、電流遮断装置の端面から遠い側の端部よりも端面に近い位置に配置されている。 This specification discloses a power storage device. The power storage device includes a case, an electrode assembly housed in the case, a current collecting tab extending from the electrode assembly and disposed between the electrode assembly and the end surface of the case, and a current collecting tab The first lead, the terminal provided on the end surface of the case, the second lead joined to the terminal inside the case, and the first lead and the second lead are provided to conduct current. A current interrupting device capable of changing the amount. In the power storage device, when viewed in plan from the end surface of the case, the terminal, the current interrupt device, and the current collecting tab are arranged offset from each other. In the power storage device, the end portion closer to the end surface of the current collecting tab is arranged at a position closer to the end surface than the end portion far from the end surface of the current interrupt device.
　上記の蓄電装置によれば、ケースの端子が取り付けられる端面と電極組立体の間の空間を有効に活用して、端子と電流遮断装置と集電タブを配置することが可能となる。ケースの端子が取り付けられる端面と電極組立体の間の距離を短くして、蓄電装置の小型化を図ることができる。 According to the above power storage device, it is possible to arrange the terminal, the current interrupting device, and the current collecting tab by effectively utilizing the space between the end face to which the terminal of the case is attached and the electrode assembly. The distance between the end face to which the terminal of the case is attached and the electrode assembly can be shortened to reduce the size of the power storage device.
　本明細書が開示する技術によれば、蓄電装置をより小型化することができる。 According to the technology disclosed in this specification, the power storage device can be further downsized.
蓄電装置２の内部の構成を示す縦断面図である。2 is a longitudinal sectional view showing an internal configuration of a power storage device 2. FIG. 図１のＡ－Ａから見た縦断面図である。FIG. 2 is a longitudinal sectional view taken along line AA in FIG. 図１のＢ－Ｂから見た平面図である。FIG. 3 is a plan view seen from BB in FIG. 1. ケース４の内圧が低い場合の電流遮断装置４０の構成を示す図である。It is a figure which shows the structure of the electric current interruption apparatus 40 when the internal pressure of case 4 is low. ケース４の内圧が高い場合の電流遮断装置４０の構成を示す図である。It is a figure which shows the structure of the electric current interruption apparatus 40 in case the internal pressure of case 4 is high. 第２実施例の蓄電装置２の構成を示す拡大縦断面図である。It is an expanded longitudinal cross-sectional view which shows the structure of the electrical storage apparatus 2 of 2nd Example. 第２実施例の蓄電装置２の電流遮断装置４１を図６のＣ－Ｃから見た拡大縦断面図である（ケース内の圧力が低い状態）。FIG. 7 is an enlarged longitudinal sectional view of a current interrupting device 41 of a power storage device 2 according to a second embodiment as seen from CC in FIG. 第２実施例の蓄電装置２の電流遮断装置４１を図６のＣ－Ｃから見た拡大縦断面図である（ケース内の圧力が高い状態）。FIG. 7 is an enlarged vertical cross-sectional view of the current interrupt device 41 of the power storage device 2 of the second embodiment as seen from CC in FIG.
　以下、本明細書で開示する実施例の技術的特徴の幾つかを記す。なお、以下に記す事項は、各々単独で技術的な有用性を有している。 Hereinafter, some of the technical features of the embodiments disclosed in this specification will be described. The items described below have technical usefulness independently.
（特徴１）　本明細書で開示する蓄電装置は、集電タブが折り曲げられており、端面に略平行な平坦部を有していてもよい。 (Characteristic 1) In the power storage device disclosed in this specification, the current collecting tab may be bent and may have a flat portion substantially parallel to the end surface.
　上記の蓄電装置によれば、集電タブの平坦部を利用して集電タブと第１リードを接合することで、集電タブを真っ直ぐに伸ばした場合に比べて、ケースの端子が取り付けられる端面と電極組立体の間の距離を短くすることができる。蓄電装置の寸法を小型化することができる。 According to the above power storage device, the terminal of the case can be attached by joining the current collecting tab and the first lead using the flat portion of the current collecting tab as compared with the case where the current collecting tab is straightened. The distance between the end face and the electrode assembly can be shortened. The size of the power storage device can be reduced.
（特徴２）　本明細書で開示する蓄電装置は、ケースの端面に、面と面が向かい合った状態で端面に当接する絶縁板が設けられており、集電タブが、絶縁板に当接するか、または絶縁板との間に第１リードを挟んだ状態で配置され、電流遮断装置が、絶縁板に当接するか、または絶縁板との間に第２リードを挟んだ状態で配置されていてもよい。 (Characteristic 2) In the power storage device disclosed in this specification, an insulating plate is provided on the end surface of the case so that the surface is in contact with the end surface, and the current collecting tab contacts the insulating plate. Or a current interrupting device is disposed in contact with the insulating plate or in a state in which the second lead is sandwiched between the insulating plate and the insulating plate. Also good.
　上記の蓄電装置では、電流遮断装置と集電タブを可能な限りケースの端面に近接させることで、ケースの端面と電極組立体の間の距離を短くすることができる。蓄電装置の寸法を小型化することができる。 In the above power storage device, the distance between the end surface of the case and the electrode assembly can be shortened by bringing the current interrupt device and the current collecting tab as close as possible to the end surface of the case. The size of the power storage device can be reduced.
（特徴３）　本明細書で開示する蓄電装置は、第１リードおよび第２リードの少なくとも一方が、ケースの端面に略平行に伸びる第１平面部と、第１平面部よりも電極組立体に近い位置でケースの端面に略平行に伸びる第２平面部と、第１平面部と第２平面部を連結する連結部を備えており、第１リードおよび第２リードの一方の第１平面部と、第１リードおよび第２リードの他方の少なくとも一部が、ケースの端面に面と面が向かい合った状態で当接する絶縁板に当接していてもよい。 (Characteristic 3) In the power storage device disclosed in the present specification, at least one of the first lead and the second lead extends to the electrode assembly more than the first flat portion, the first flat portion extending substantially parallel to the end surface of the case. A first plane portion of one of the first lead and the second lead, the second plane portion extending substantially parallel to the end face of the case at a near position, and a connecting portion connecting the first plane portion and the second plane portion. In addition, at least a part of the other of the first lead and the second lead may be in contact with an insulating plate that is in contact with the end surface of the case in a state where the surface faces the surface.
　上記の蓄電装置では、ケースの端子が取り付けられる端面と電極組立体の間の距離を短くして、蓄電装置の寸法を小型化することができる。また、電流遮断装置や集電タブがケースに対して振動することを防止することができる。 In the above power storage device, the distance between the end face to which the terminal of the case is attached and the electrode assembly can be shortened to reduce the size of the power storage device. Moreover, it can prevent that an electric current interruption apparatus and a current collection tab vibrate with respect to a case.
（特徴４）　本明細書で開示する蓄電装置では、電流遮断装置は、導電性を有するダイアフラムを有し、ダイアフラムは、その外周部に位置する外周縁部と、外周縁部の内側に位置し、ケース内の圧力が上昇するとダイアフラムの変形によって変位する変位部とを有し、外周縁部は、第１リードおよび第２リードの一方と固定されて電気的に接続されており、変位部は、第１リードおよび第２リードの他方と固定されて電気的に接続されており、ケース内の圧力が上昇すると、第１リードおよび第２リードの他方が破断して、電流が流れない状態とすることができてもよい。 (Characteristic 4) In the power storage device disclosed in the present specification, the current interrupting device has a conductive diaphragm, and the diaphragm is positioned on the outer peripheral portion and on the inner side of the outer peripheral portion. And a displacement portion that is displaced by the deformation of the diaphragm when the pressure in the case rises, and the outer peripheral edge portion is fixed and electrically connected to one of the first lead and the second lead, and the displacement portion is The first lead and the second lead are fixed and electrically connected to each other, and when the pressure in the case increases, the other of the first lead and the second lead breaks and no current flows. You may be able to.
　上記の蓄電装置によれば、第１リードと第２リードとが、ダイアフラムを介して接続されることで電流遮断装置を形成している。このため、比較的簡単な構成で電流遮断装置を構成することができる。 According to the above power storage device, the first lead and the second lead are connected via the diaphragm to form a current interrupt device. For this reason, the current interrupting device can be configured with a relatively simple configuration.
（特徴５）　本明細書で開示する蓄電装置では、電流遮断装置は、絶縁性を有するスペーサと、第１リードおよび第２リードの一方、ダイアフラムの外周縁部、スペーサ、第１リードおよび第２リードの他方を、順に重ねた状態で挟持しているカシメ部材と、を備えていてもよい。 (Characteristic 5) In the power storage device disclosed in this specification, the current interrupt device includes an insulating spacer, one of the first lead and the second lead, the outer peripheral edge of the diaphragm, the spacer, the first lead, and the second lead. And a crimping member that holds the other of the leads in a state of being sequentially stacked.
　上記の蓄電装置によれば、比較的簡単な構造により、電流遮断装置の構成部品を一体化することができる。 According to the above power storage device, the components of the current interrupt device can be integrated with a relatively simple structure.
（特徴６）　本明細書で開示する蓄電装置は二次電池であってもよい。 (Feature 6) The power storage device disclosed in this specification may be a secondary battery.
　図１は本実施例の蓄電装置２の概略の構成を示している。蓄電装置２は、例えばニッケル水素電池やリチウムイオン電池等の二次電池である。蓄電装置２は、ハイブリッド自動車や電気自動車等の車両に搭載されて、車輪を回転駆動するモータに電極を供給する。また、蓄電装置２は、モータが回生発電した電力によって充電を行う。 FIG. 1 shows a schematic configuration of a power storage device 2 of the present embodiment. The power storage device 2 is a secondary battery such as a nickel metal hydride battery or a lithium ion battery. The power storage device 2 is mounted on a vehicle such as a hybrid vehicle or an electric vehicle, and supplies electrodes to a motor that rotates the wheels. In addition, the power storage device 2 is charged with electric power regenerated by the motor.
　蓄電装置２は、ケース４と、電極組立体６と、電極組立体６から延設された集電タブ８ａ，８ｂと、第１リード１０ａ，１０ｂと、正極端子１２ａと、負極端子１２ｂと、第２リード２２と、電流遮断装置４０を備えている。 The power storage device 2 includes a case 4, an electrode assembly 6, current collecting tabs 8a and 8b extending from the electrode assembly 6, first leads 10a and 10b, a positive terminal 12a, a negative terminal 12b, A second lead 22 and a current interrupt device 40 are provided.
　ケース４は略直方体形状の箱型部材であり、内部に電極組立体６、集電タブ８ａ，８ｂ、第１リード１０ａ，１０ｂ、第２リード２２、電流遮断装置４０を収容している。ケース４の上端面には、正極端子１２ａと負極端子１２ｂが設けられている。 The case 4 is a substantially rectangular parallelepiped box-shaped member, and accommodates the electrode assembly 6, current collecting tabs 8 a and 8 b, the first leads 10 a and 10 b, the second lead 22, and the current interrupt device 40. A positive terminal 12 a and a negative terminal 12 b are provided on the upper end surface of the case 4.
　電極組立体６は、正負極それぞれの活物質および集電体、およびセパレータ等を備える捲回型の電極組立体である。電極組立体６の正極の集電体から集電タブ８ａが伸びており、負極の集電体から集電タブ８ｂが伸びている。 The electrode assembly 6 is a wound electrode assembly including active materials and current collectors for positive and negative electrodes, a separator, and the like. A current collecting tab 8a extends from the positive current collector of the electrode assembly 6, and a current collecting tab 8b extends from the negative current collector.
　図２に示すように、集電タブ８ａは、電極組立体６からケース４の上端面に向けて伸び、途中で屈曲して、ケース４の上端面に略平行な平坦部１８ａを有する形状に形成されている。同様に、集電タブ８ｂは、電極組立体６からケース４の上端面に向けて伸び、途中で屈曲して、ケース４の上端面に略平行な平坦部１８ｂを有する形状に形成されている。 As shown in FIG. 2, the current collecting tab 8 a extends from the electrode assembly 6 toward the upper end surface of the case 4, bends in the middle, and has a flat portion 18 a substantially parallel to the upper end surface of the case 4. Is formed. Similarly, the current collecting tab 8 b extends from the electrode assembly 6 toward the upper end surface of the case 4, bends in the middle, and has a flat portion 18 b that is substantially parallel to the upper end surface of the case 4. .
　図１に示すように、第１リード１０ａは、第１平面部２０ａと、第２平面部２０ｂと、連結部２０ｃを備える断面Ｓ字形状の導電性部材である。第１平面部２０ａは、ケース４の上端面に対して略平行に伸びている。第２平面部２０ｂは、第１平面部２０ａよりも電極組立体６に近い位置で、ケース４の上端面に対して略平行に伸びている。連結部２０ｃは、第１平面部２０ａと第２平面部２０ｂを連結している。図２に示すように、第１リード１０ａの第１平面部２０ａの下面と、集電タブ８ａの平坦部１８ａの上面が当接しており、両者は溶接によって固定されている。 As shown in FIG. 1, the first lead 10a is a conductive member having a S-shaped cross section including a first flat surface portion 20a, a second flat surface portion 20b, and a connecting portion 20c. The first flat surface portion 20 a extends substantially parallel to the upper end surface of the case 4. The second planar portion 20b extends substantially parallel to the upper end surface of the case 4 at a position closer to the electrode assembly 6 than the first planar portion 20a. The connection part 20c has connected the 1st plane part 20a and the 2nd plane part 20b. As shown in FIG. 2, the lower surface of the first flat portion 20a of the first lead 10a and the upper surface of the flat portion 18a of the current collecting tab 8a are in contact, and both are fixed by welding.
　図１に示すように、第１リード１０ｂは、平板状の導電性部材である。第１リード１０ｂは、ケース４の上端面に対して略平行に伸びている。第１リード１０ｂの下面と、集電タブ８ｂの平坦部１８ｂの上面が当接しており、両者は溶接によって固定されている。 As shown in FIG. 1, the first lead 10b is a flat conductive member. The first lead 10 b extends substantially parallel to the upper end surface of the case 4. The lower surface of the first lead 10b is in contact with the upper surface of the flat portion 18b of the current collecting tab 8b, and both are fixed by welding.
　図１に示すように、第２リード２２は、平板状の導電性部材である。第２リード２２は、ケース４の上端面に対して略平行に伸びている。 As shown in FIG. 1, the second lead 22 is a flat conductive member. The second lead 22 extends substantially parallel to the upper end surface of the case 4.
　正極端子１２ａは、ボルト２４ａと、内側ナット２６ａと、外側ナット２８ａを備えている。正極端子１２ａが配置される位置において、ケース４の上端面には貫通孔が形成されており、その貫通孔に絶縁性のガスケット３０ａが取り付けられている。内側ナット２６ａは、第２リード２２に形成された貫通孔を貫通して、ガスケット３０ａに取り付けられている。ボルト２４ａは、シール座金３２ａを介して、内側ナット２６ａに締結されている。第２リード２２は、内側ナット２６ａとガスケット３０ａに挟持されている。ガスケット３０ａは、ケース４の上端面に当接しながら平板状に伸びる絶縁板としての延伸部３４ａを備えている。第１リード１０ａの第１平面部２０ａの上面と、第２リード２２の上面は、延伸部３４ａに当接している。なお、正極端子１２ａの外側ナット２８ａは、正極端子１２ａと配線部材との結線に用いられる。 The positive terminal 12a includes a bolt 24a, an inner nut 26a, and an outer nut 28a. A through hole is formed in the upper end surface of the case 4 at a position where the positive electrode terminal 12a is disposed, and an insulating gasket 30a is attached to the through hole. The inner nut 26a passes through a through hole formed in the second lead 22, and is attached to the gasket 30a. The bolt 24a is fastened to the inner nut 26a via the seal washer 32a. The second lead 22 is sandwiched between the inner nut 26a and the gasket 30a. The gasket 30 a includes an extending portion 34 a as an insulating plate that extends in a flat plate shape while contacting the upper end surface of the case 4. The upper surface of the first flat portion 20a of the first lead 10a and the upper surface of the second lead 22 are in contact with the extending portion 34a. The outer nut 28a of the positive terminal 12a is used for connecting the positive terminal 12a and the wiring member.
　負極端子１２ｂは、ボルト２４ｂと、内側ナット２６ｂと、外側ナット２８ｂを備えている。負極端子１２ｂが配置される位置において、ケース４の上端面には貫通孔が形成されており、その貫通孔に絶縁性のガスケット３０ｂが取り付けられている。内側ナット２６ｂは、第１リード１０ｂに形成された貫通孔を貫通して、ガスケット３０ｂに取り付けられている。ボルト２４ｂは、シール座金３２ｂを介して、内側ナット２６ｂに締結されている。第１リード１０ｂは、内側ナット２６ｂとガスケット３０ｂに挟持されている。ガスケット３０ｂは、ケース４の上端面に当接しながら平板状に伸びる延伸部３４ｂを備えている。第１リード１０ａの上面は、延伸部３４ｂに当接している。なお、負極端子１２ｂの外側ナット２８ｂは、負極端子１２ｂと配線部材との結線に用いられる。 The negative electrode terminal 12b includes a bolt 24b, an inner nut 26b, and an outer nut 28b. At the position where the negative electrode terminal 12b is disposed, a through hole is formed in the upper end surface of the case 4, and an insulating gasket 30b is attached to the through hole. The inner nut 26b passes through a through hole formed in the first lead 10b and is attached to the gasket 30b. The bolt 24b is fastened to the inner nut 26b via the seal washer 32b. The first lead 10b is sandwiched between the inner nut 26b and the gasket 30b. The gasket 30 b includes an extending portion 34 b that extends in a flat plate shape while contacting the upper end surface of the case 4. The upper surface of the first lead 10a is in contact with the extending portion 34b. The outer nut 28b of the negative electrode terminal 12b is used for connecting the negative electrode terminal 12b and the wiring member.
　第１リード１０ａと第２リード２２は、電流遮断装置４０を介して接続している。図３に示すように、正極端子１２ａと、電流遮断装置４０と、集電タブ８ａは、ケース４の上端面から平面視したときに、互いにオフセットして配置されている。図４に示すように、電流遮断装置４０は、第１リード１０ａの第２平面部２０ｂの端部と、第２リード２２の端部を機械的に固定する絶縁性のブラケット３６と、第２リード２２と当接した状態でブラケット３６に保持される導電性のダイアフラム３８を備えている。ダイアフラム３８は、ケース４の内圧に応じて、図４のように下方に膨出した状態と、図５のように上方に膨出した状態の間で変形可能である。図４のようにダイアフラム３８が下方に膨出した状態では、ダイアフラム３８の下方に膨出した部分が第１リード１０ａの第２平面部２０ｂに形成された開口の縁と当接して、ダイアフラム３８を介して第１リード１０ａと第２リード２２が電気的に導通する。図５のようにダイアフラム３８が上方に膨出した状態では、ダイアフラム３８が第１リード１０ａの第２平面部２０ｂから離間して、第１リード１０ａと第２リード２２が電気的に絶縁する。なお、第２リード２２には、ダイアフラム３８が上方に膨出した状態となるときに、ダイアフラム３８の膨出した部分と干渉しないように、開口が形成されている。 The first lead 10 a and the second lead 22 are connected via a current interrupt device 40. As shown in FIG. 3, the positive electrode terminal 12 a, the current interrupt device 40, and the current collecting tab 8 a are arranged so as to be offset from each other when viewed from the upper end surface of the case 4. As shown in FIG. 4, the current interrupt device 40 includes an end portion of the second flat portion 20 b of the first lead 10 a, an insulating bracket 36 that mechanically fixes the end portion of the second lead 22, and a second A conductive diaphragm 38 is provided that is held by the bracket 36 in contact with the lead 22. The diaphragm 38 can be deformed between a state where it bulges downward as shown in FIG. 4 and a state where it bulges upward as shown in FIG. 5 according to the internal pressure of the case 4. In the state where the diaphragm 38 bulges downward as shown in FIG. 4, the portion bulged downward of the diaphragm 38 abuts on the edge of the opening formed in the second flat portion 20b of the first lead 10a, and the diaphragm 38 The first lead 10a and the second lead 22 are electrically connected via each other. In the state where the diaphragm 38 bulges upward as shown in FIG. 5, the diaphragm 38 is separated from the second flat portion 20b of the first lead 10a, and the first lead 10a and the second lead 22 are electrically insulated. The second lead 22 has an opening so as not to interfere with the bulged portion of the diaphragm 38 when the diaphragm 38 is bulged upward.
　電流遮断装置４０は、ケース４の内圧が低い場合には、図４に示すようにダイアフラム３８を介して第１リード１０ａと第２リード２２を電気的に導通し、ケース４の内圧が高い場合には、図４に示すように第１リード１０ａと第２リード２２を電気的に絶縁する。電流遮断装置４０は、内圧検知型の電流遮断装置ということができる。 When the internal pressure of the case 4 is low, the current interrupt device 40 electrically connects the first lead 10a and the second lead 22 via the diaphragm 38 as shown in FIG. As shown in FIG. 4, the first lead 10a and the second lead 22 are electrically insulated. The current interrupt device 40 can be referred to as an internal pressure detection type current interrupt device.
　本実施例の蓄電装置２では、正極端子１２ａと、電流遮断装置４０と、集電タブ８ａが、ケース４の上端面から平面視したときに、互いにオフセットして配置されている。また、本実施例の蓄電装置２では、集電タブ８ａの上端部が電流遮断装置４０の下端部よりもケース４の上端面に近い位置に配置されている。このような構成とすることによって、従来はデッドスペースとなっていた正極端子１２ａの側方や電流遮断装置４０の側方の空間を有効に活用し、蓄電装置２の上下方向の寸法を小型化することができる。 In the power storage device 2 of the present embodiment, the positive electrode terminal 12a, the current interrupt device 40, and the current collecting tab 8a are arranged offset from each other when viewed in plan from the upper end surface of the case 4. Further, in the power storage device 2 of the present embodiment, the upper end portion of the current collecting tab 8 a is disposed at a position closer to the upper end surface of the case 4 than the lower end portion of the current interrupt device 40. By adopting such a configuration, the space on the side of the positive electrode terminal 12a and the side of the current interrupting device 40, which has conventionally been a dead space, is effectively used, and the vertical dimension of the power storage device 2 is reduced. can do.
　本実施例の蓄電装置２では、集電タブ８ａ，８ｂが、ケース４の上端面に対して略平行な方向に折り曲げられ、ケース４の上端面に対して略平行な平坦部１８ａ，１８ｂが形成されている。このような構成とすることによって、集電タブ８ａ，８ｂを真っ直ぐに伸ばした場合に比べて、蓄電装置２の上下方向の寸法を小型化することができる。 In the power storage device 2 of the present embodiment, the current collecting tabs 8 a and 8 b are bent in a direction substantially parallel to the upper end surface of the case 4, and flat portions 18 a and 18 b that are substantially parallel to the upper end surface of the case 4 are formed. Is formed. By setting it as such a structure, the dimension of the up-down direction of the electrical storage apparatus 2 can be reduced compared with the case where the current collection tabs 8a and 8b are extended straight.
　本実施例の蓄電装置２では、ケース４の上端面に、面と面が向かい合った状態でケース４の上端面に当接する絶縁性のガスケット３０ａが設けられている。また、集電タブ８ａは、ガスケット３０ａとの間に第１リード１０ａを挟んだ状態で配置されており、電流遮断装置４０は、ガスケット３０ａとの間に第２リード２２を挟んだ状態で配置されている。このような構成とすることによって、電流遮断装置４０と集電タブ８ａを可能な限りケース４の上端面に近接させて、ケース４の上端面と電極組立体６の間の距離を短くすることができる。蓄電装置２の寸法を小型化することができる。 In the power storage device 2 of the present embodiment, an insulating gasket 30a that abuts on the upper end surface of the case 4 in a state where the surface faces the upper end surface of the case 4 is provided. The current collecting tab 8a is disposed with the first lead 10a sandwiched between the gasket 30a and the current interrupt device 40 is disposed with the second lead 22 sandwiched between the gasket 30a. Has been. By adopting such a configuration, the current interrupting device 40 and the current collecting tab 8a are brought as close as possible to the upper end surface of the case 4, and the distance between the upper end surface of the case 4 and the electrode assembly 6 is shortened. Can do. The size of the power storage device 2 can be reduced.
　本実施例の蓄電装置２では、第１リード１０ａが、ケース４の上端面に略平行に伸びる第１平面部２０ａと、第１平面部２０ａよりも電極組立体６に近い位置でケース４の上端面に略平行に伸びる第２平面部２０ｂと、第１平面部２０ａと第２平面部２０ｂを連結する連結部２０ｃを備えており、第１リード１０ａの第１平面部２０ａと第２リード２２が、ケース４の上端面に面と面が向かい合った状態で当接する絶縁性のガスケット３０ａの延伸部３４ａに当接している。このような構成とすることによって、蓄電装置２の上下方向の寸法を小型化することができる。また、電流遮断装置４０や集電タブ８ａがケース４に対して振動することを防止することができる。 In the power storage device 2 according to the present embodiment, the first lead 10a extends in a substantially parallel manner to the upper end surface of the case 4, and the case 4 is positioned closer to the electrode assembly 6 than the first flat portion 20a. A second flat surface portion 20b extending substantially parallel to the upper end surface, and a connecting portion 20c for connecting the first flat surface portion 20a and the second flat surface portion 20b are provided, and the first flat surface portion 20a of the first lead 10a and the second lead. 22 is in contact with the extended portion 34a of the insulating gasket 30a that is in contact with the upper end surface of the case 4 in a state in which the surfaces face each other. By setting it as such a structure, the vertical dimension of the electrical storage apparatus 2 can be reduced in size. Further, the current interrupt device 40 and the current collecting tab 8a can be prevented from vibrating with respect to the case 4.
　第２の実施例の蓄電装置２について、図６から図８を用いて説明する。第１の実施例と同一の部品には同一の符号を付して説明を省略する。蓄電装置２は、電流遮断装置４１を備えている。電流遮断装置４１は、内圧検知型の電流遮断装置である。第２の実施例の蓄電装置２は、第１リード５０と、第２リード５２とを有している。図６に示すように、第１リード５０の図６右側の端部の下面と、集電タブ８ａの平坦部１８ａの上面が当接しており、両者は溶接によって固定されている。図６に示すように、第２リード５２は、平板状の導電性部材である。第２リード５２は、ケース４の上端面に対して略平行に伸びている。第２リード５２の図６左側の端部は、内側ナット２６ａとガスケット３０ａとの間に挟持されている。 The power storage device 2 of the second embodiment will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. The power storage device 2 includes a current interrupt device 41. The current interrupt device 41 is an internal pressure detection type current interrupt device. The power storage device 2 according to the second embodiment has a first lead 50 and a second lead 52. As shown in FIG. 6, the lower surface of the right end of FIG. 6 of the first lead 50 is in contact with the upper surface of the flat portion 18a of the current collecting tab 8a, and both are fixed by welding. As shown in FIG. 6, the second lead 52 is a flat conductive member. The second lead 52 extends substantially parallel to the upper end surface of the case 4. The left end of the second lead 52 in FIG. 6 is sandwiched between the inner nut 26a and the gasket 30a.
　第１リード５０の図６左側の端部と第２リード５２の図６右側の端部は、電流遮断装置４１を介して接続されている。第１実施例の蓄電装置２と同様に、正極端子１２ａと、電流遮断装置４１と、集電タブ８ａは、ケース４の上端面から平面視したときに、互いにオフセットして配置されている。図７に電流遮断装置４１のケース４の内圧が低いときの状態を示す。電流遮断装置４１は、導電性のダイアフラム６８と、絶縁性のスペーサ６６とを備えている。スペーサ６６は中央部に開口部を有する円環形状であり、ダイアフラム６８と同心状に配置されている。スペーサ６６としては、ゴム等の絶縁性を有する材質が使用できる。あるいは、金属の表面に絶縁性の樹脂コーティングをしたものが使用できる。第２リード５２、ダイアフラム６８の外周部に位置する外周縁部７１、スペーサ６６、第１リード５０は順に（図７上から下に）重ねられている。ダイアフラム６８の外周縁部７１と、第２リード５２とは溶接されて電気的に接続されている。溶接されることでダイアフラム６８と第２リード５２とに囲まれた空間は気密に保たれている。重ねられた、第２リード５２、ダイアフラム６８の外周縁部７１、スペーサ６６、第１リード５０は、絶縁シート６７ｃを介してカシメ部材６９ｃによって挟持されている。カシメ部材６９ｃは、絶縁シート６７ｃによって、第１リード５０、ダイアフラム６８、及び第２リード５２から絶縁されている。ダイアフラム６８の外周縁部７１と第１リード５０との間は、スペーサ６６によって絶縁されている。カシメ部材６９ｃの上端は、先述した絶縁性のガスケット３０ａから延びる延伸部３４ａに固定されている。 The end of the first lead 50 on the left side in FIG. 6 and the end of the second lead 52 on the right side in FIG. 6 are connected via a current interrupt device 41. Similar to the power storage device 2 of the first embodiment, the positive electrode terminal 12 a, the current interrupt device 41, and the current collecting tab 8 a are arranged offset from each other when viewed from the upper end surface of the case 4. FIG. 7 shows a state when the internal pressure of the case 4 of the current interrupt device 41 is low. The current interrupt device 41 includes a conductive diaphragm 68 and an insulating spacer 66. The spacer 66 has an annular shape having an opening at the center, and is arranged concentrically with the diaphragm 68. As the spacer 66, an insulating material such as rubber can be used. Alternatively, a metal surface with an insulating resin coating can be used. The second lead 52, the outer peripheral edge 71 located on the outer peripheral portion of the diaphragm 68, the spacer 66, and the first lead 50 are stacked in order (from top to bottom in FIG. 7). The outer peripheral edge 71 of the diaphragm 68 and the second lead 52 are welded and electrically connected. By welding, the space surrounded by the diaphragm 68 and the second lead 52 is kept airtight. The second lead 52, the outer peripheral edge 71 of the diaphragm 68, the spacer 66, and the first lead 50, which are overlapped, are sandwiched by the crimping member 69c via the insulating sheet 67c. The caulking member 69 c is insulated from the first lead 50, the diaphragm 68, and the second lead 52 by the insulating sheet 67 c. The outer peripheral edge 71 of the diaphragm 68 and the first lead 50 are insulated by a spacer 66. The upper end of the caulking member 69c is fixed to the extending portion 34a extending from the insulating gasket 30a described above.
　ケース４の内圧が低い状態ではダイアフラム６８は下方に膨出している（図７）。ダイアフラム６８の下側に膨出している部分の下面（ダイアフラム６８の中央部７２の下面）と、第１リード５０の上面とが溶接され、ダイアフラム６８と第１リード５０とが電気的に接続されている。第２リード５２、ダイアフラム６８、第１リード５０が順に電気的に接続されて通電経路を形成している。 When the internal pressure of the case 4 is low, the diaphragm 68 bulges downward (FIG. 7). The lower surface (the lower surface of the central portion 72 of the diaphragm 68) that bulges below the diaphragm 68 and the upper surface of the first lead 50 are welded, and the diaphragm 68 and the first lead 50 are electrically connected. ing. The second lead 52, the diaphragm 68, and the first lead 50 are electrically connected in order to form an energization path.
　ダイアフラム６８の下側の面は、ケース４の電極組立体６を収容している空間の圧力を受けている。一方、ダイアフラム６８の上側の面は、第２リード５２とダイアフラム６８とに囲まれた空間の圧力を受けている。第２リード５２とダイアフラム６８とに囲まれた空間は、ケース４の電極組立体６を収容している空間から隔離されている。 The lower surface of the diaphragm 68 receives the pressure of the space in which the electrode assembly 6 of the case 4 is accommodated. On the other hand, the upper surface of the diaphragm 68 receives the pressure of the space surrounded by the second lead 52 and the diaphragm 68. The space surrounded by the second lead 52 and the diaphragm 68 is isolated from the space that houses the electrode assembly 6 of the case 4.
　第１リード５０の下側の面には、脆弱部５１が形成されている。脆弱部５１は、ダイアフラム６８と第１リード５０が溶接されている範囲を取り囲むように円弧状に形成されている。脆弱部５１は、断面が三角形の溝であり刻印により形成されている。第１リード５０の下面の内、脆弱部５１の内側の部分は移動側導電部５３となっており、脆弱部５１の外側の部分は固定側導電部５４となっている。 A fragile portion 51 is formed on the lower surface of the first lead 50. The fragile portion 51 is formed in an arc shape so as to surround a range where the diaphragm 68 and the first lead 50 are welded. The fragile portion 51 is a groove having a triangular cross section and is formed by engraving. Of the lower surface of the first lead 50, the inner portion of the fragile portion 51 is a moving-side conductive portion 53, and the outer portion of the fragile portion 51 is a fixed-side conductive portion 54.
　ケース４の内圧が上昇すると、図８に示すように、ダイアフラム６８が変形し、外周縁部７１以外の部分が図８上側に変位する。ダイアフラム６８の中央部７２は最も大きく変位する。ダイアフラム６８の中央部７２は請求項でいう「変位部」の一例である。ダイアフラム６８の中央部７２と移動側導電部５３とが一体となって上側に移動し、第１リード５０は脆弱部５１の部分で破断する。移動側導電部５３と固定側導電部５４が分離することで、第２リード５２、ダイアフラム６８、第１リード５０を順に結んだ経路に電流が流れない状態となる。 When the internal pressure of the case 4 rises, as shown in FIG. 8, the diaphragm 68 is deformed, and parts other than the outer peripheral edge 71 are displaced upward in FIG. The central portion 72 of the diaphragm 68 is displaced most greatly. The central portion 72 of the diaphragm 68 is an example of the “displacement portion” in the claims. The central portion 72 of the diaphragm 68 and the moving-side conductive portion 53 are integrally moved and moved upward, and the first lead 50 is broken at the fragile portion 51. The movement-side conductive portion 53 and the fixed-side conductive portion 54 are separated, so that no current flows in a path connecting the second lead 52, the diaphragm 68, and the first lead 50 in this order.
　第２実施例の蓄電装置２では、第１リード５０と第２リード５２とが、ダイアフラム６８のみを介して接続されている。このため、比較的簡単な構成で電流遮断装置４１を構成することができる。第２リード５２とダイアフラム６８の外周縁部７１が溶接されることで、電極組立体６が収容されている空間と隔離された空間が形成される。このため、隔離された空間を比較的簡単な構成で形成することができる。第１リード５０は、破断前の状態では一体の導電部材である。このため、第１リード５０が複数の部材を接合して形成されている場合と比較して、第１リード５０の電気抵抗を低減することができ、結果として蓄電装置２の電気抵抗を低減することができる。 In the power storage device 2 of the second embodiment, the first lead 50 and the second lead 52 are connected only through the diaphragm 68. For this reason, the current interrupting device 41 can be configured with a relatively simple configuration. The second lead 52 and the outer peripheral edge 71 of the diaphragm 68 are welded to form a space isolated from the space in which the electrode assembly 6 is accommodated. For this reason, the isolated space can be formed with a relatively simple configuration. The first lead 50 is an integral conductive member in a state before breaking. For this reason, compared with the case where the 1st lead | read | reed 50 is formed by joining several members, the electrical resistance of the 1st lead | read | reed 50 can be reduced and the electrical resistance of the electrical storage apparatus 2 is reduced as a result. be able to.
　第２実施例の蓄電装置２では、第２リード５２、ダイアフラム６８の外周縁部７１、スペーサ６６、第１リード５０が、カシメ部材６９ｃにより一体化されている。このため、比較的簡単な構造により、これらの構成部品を一体化することができる。 In the power storage device 2 of the second embodiment, the second lead 52, the outer peripheral edge 71 of the diaphragm 68, the spacer 66, and the first lead 50 are integrated by a caulking member 69c. For this reason, these components can be integrated with a relatively simple structure.
　上記の第２実施例の蓄電装置２では、第２リード５２とダイアフラム６８の外周縁部７１が溶接され、第１リード５０とダイアフラム６８の中央部７２が溶接され、第１リード５０に脆弱部５１が形成され、外周縁部７１と第１リード５０との間がスペーサ６６によって絶縁されていた。しかし、第１リード５０とダイアフラム６８の外周縁部７１が溶接され、第２リード５２とダイアフラム６８の中央部７２が溶接され、第２リード５２に脆弱部５１が形成され、外周縁部７１と第２リード５２との間がスペーサ６６によって絶縁されていてもよい。 In the power storage device 2 of the second embodiment, the second lead 52 and the outer peripheral edge portion 71 of the diaphragm 68 are welded, the first lead 50 and the center portion 72 of the diaphragm 68 are welded, and the first lead 50 is weakened. 51 was formed, and the outer peripheral edge 71 and the first lead 50 were insulated by the spacer 66. However, the first lead 50 and the outer peripheral edge portion 71 of the diaphragm 68 are welded, the second lead 52 and the central portion 72 of the diaphragm 68 are welded, and the weakened portion 51 is formed on the second lead 52. The second lead 52 may be insulated by the spacer 66.
　上記の実施例では、ケース４が略直方体形状の箱型部材である場合について説明したが、ケース４は例えば略円筒形状の箱型部材であってもよい。 In the above embodiment, the case 4 is a substantially rectangular parallelepiped box-shaped member, but the case 4 may be a substantially cylindrical box-shaped member, for example.
　上記の実施例では、電極組立体６が捲回型のものである場合について説明したが、電極組立体６は積層型のものであってもよい。 In the above embodiment, the case where the electrode assembly 6 is a wound type has been described, but the electrode assembly 6 may be a laminated type.
　上記の実施例では、第１リード１０ａが第１平面部２０ａと第２平面部２０ｂと連結部２０ｃを備える断面Ｓ字形状であり、第２リード２２が平板状である場合について説明したが、第２リード２２を断面Ｓ字形状として、第１リード１０ａを平板状としてもよい。 In the above embodiment, the case where the first lead 10a has an S-shaped cross section including the first flat surface portion 20a, the second flat surface portion 20b, and the connecting portion 20c, and the second lead 22 has a flat plate shape has been described. The second lead 22 may have an S-shaped cross section, and the first lead 10a may have a flat plate shape.
　上記の実施例では、第１リード１０ａの第１平面部２０ａが集電タブ８ａの平坦部１８ａとガスケット３０ａの延伸部３４ａの間に挟み込まれている場合について説明したが、これ以外の構成とすることもできる。例えば平坦部１８ａを延伸部３４ａに当接させて、第１平面部２０ａを平坦部１８ａの下側に当接させてもよい。あるいは、平坦部１８ａを延伸部３４ａに当接させて、第１平面部２０ａを平坦部１８ａの中に挿入してもよい。集電タブ８ｂ、第１リード１０ｂおよびガスケット３０ｂの関係についても同様である。 In the above embodiment, the case where the first flat portion 20a of the first lead 10a is sandwiched between the flat portion 18a of the current collecting tab 8a and the extending portion 34a of the gasket 30a has been described. You can also For example, the flat portion 18a may be brought into contact with the extending portion 34a, and the first flat portion 20a may be brought into contact with the lower side of the flat portion 18a. Alternatively, the flat portion 18a may be brought into contact with the extending portion 34a, and the first flat portion 20a may be inserted into the flat portion 18a. The same applies to the relationship between the current collecting tab 8b, the first lead 10b, and the gasket 30b.
　上記の実施例では、電流遮断装置４０がケース４の内圧に応じて電流の導通と非導通を切り換える内圧検知型の電流遮断装置である場合について説明したが、電流遮断装置４０は、例えばケース４の内部の温度に応じて電流の導通と非導通を切り換える温度検知型の電流遮断装置であってもよいし、正極端子１２ａと負極端子１２ｂの間の印加電圧に応じて電流の導通と非導通を切り換える電圧検知型の電流遮断装置であってもよい。また、電流遮断装置４０は、蓄電装置２を保護する際に電流の導通を完全に遮断するものだけでなく、例えばＰＴＣ素子等の電流の導電量を変更可能な素子を用いて、蓄電装置２を保護する際に電流の導電量を小さくして、電流の導通を実質的に遮断するものであってもよい。 In the above embodiment, the case where the current interrupting device 40 is an internal pressure detection type current interrupting device that switches between conduction and non-conduction according to the internal pressure of the case 4 has been described. It may be a temperature detection type current interrupting device that switches between conduction and non-conduction of current according to the internal temperature, and current conduction and non-conduction according to the applied voltage between the positive terminal 12a and the negative terminal 12b. It may be a voltage detection type current interrupting device for switching between. In addition, the current interrupt device 40 is not only a device that completely interrupts current conduction when protecting the power storage device 2, but also uses, for example, an element capable of changing the amount of current conduction, such as a PTC element, to store the power storage device 2. When the current is protected, the current conduction amount may be reduced to substantially cut off the current conduction.
　上記の実施例では、蓄電装置２がハイブリッド自動車や電気自動車等の車両に搭載されて使用される場合について説明したが、蓄電装置２は他の用途に用いるものであってもよい。 In the above embodiment, the case where the power storage device 2 is mounted and used in a vehicle such as a hybrid vehicle or an electric vehicle has been described. However, the power storage device 2 may be used for other purposes.
　以上、本発明の具体例を詳細に説明したが、これらは例示に過ぎず、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、出願時の請求項に記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は複数の目的を同時に達成し得るものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。 Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and has technical utility by achieving one of the objects.

Claims (7)

  1. 　ケースと、
    　前記ケースに収容された電極組立体と、
    　前記電極組立体から延在し、前記電極組立体と前記ケースの端面との間に配置された集電タブと、
    　前記集電タブと接合された第１リードと、
    　前記ケースの前記端面に設けられた端子と、
    　前記ケースの内側で前記端子と接合された第２リードと、
    　前記第１リードと前記第２リードとの間に設けられており、電流の導電量を変更可能な電流遮断装置とを備えており、
    　前記ケースの前記端面から平面視したときに、前記端子と前記電流遮断装置と前記集電タブとが互いにオフセットして配置されており、
    　前記集電タブの前記端面から近い側の端部が、前記電流遮断装置の前記端面から遠い側の端部よりも前記端面に近い位置に配置されている蓄電装置。     Case and
    An electrode assembly housed in the case;
    A current collecting tab extending from the electrode assembly and disposed between the electrode assembly and an end surface of the case;
    A first lead joined to the current collecting tab;
    A terminal provided on the end face of the case;
    A second lead joined to the terminal inside the case;
    A current interrupt device provided between the first lead and the second lead and capable of changing a current conduction amount;
    When viewed in plan from the end surface of the case, the terminal, the current interrupt device and the current collecting tab are arranged offset from each other,
    The power storage device in which an end portion closer to the end surface of the current collecting tab is disposed closer to the end surface than an end portion far from the end surface of the current interrupt device.
  2. 　前記集電タブは折り曲げられており、前記端面に略平行な平坦部を有する請求項１の蓄電装置。 The power storage device according to claim 1, wherein the current collecting tab is bent and has a flat portion substantially parallel to the end face.
  3. 　前記ケースの前記端面には、面と面が向かい合った状態で前記端面に当接する絶縁板が設けられており、
    　前記集電タブは、前記絶縁板に当接するか、または前記絶縁板との間に前記第１リードを挟んだ状態で配置され、
    　前記電流遮断装置は、前記絶縁板に当接するか、または前記絶縁板との間に前記第２リードを挟んだ状態で配置されている請求項１または２の蓄電装置。     The end surface of the case is provided with an insulating plate that comes into contact with the end surface in a state where the surface faces the surface,
    The current collecting tab is disposed in contact with the insulating plate or in a state where the first lead is sandwiched between the current collecting tab and the insulating plate,
    3. The power storage device according to claim 1, wherein the current interrupt device is disposed in contact with the insulating plate or in a state where the second lead is sandwiched between the current interrupting device and the insulating plate.
  4. 　前記第１リードおよび前記第２リードの少なくとも一方が、前記ケースの前記端面に略平行に伸びる第１平面部と、前記第１平面部よりも前記電極組立体に近い位置で前記ケースの前記端面に略平行に伸びる第２平面部と、前記第１平面部と前記第２平面部を連結する連結部を備えており、
    　前記第１リードおよび前記第２リードの一方の前記第１平面部と、前記第１リードおよび前記第２リードの他方の少なくとも一部が、前記ケースの前記端面に面と面が向かい合った状態で当接する絶縁板に当接している請求項１から３の何れか一項の蓄電装置。     At least one of the first lead and the second lead extends in a direction substantially parallel to the end surface of the case, and the end surface of the case at a position closer to the electrode assembly than the first flat portion A second plane part extending substantially parallel to the first plane part, and a connecting part for connecting the first plane part and the second plane part,
    The first flat portion of one of the first lead and the second lead and at least a part of the other of the first lead and the second lead are in a state where the surface faces the end surface of the case. The power storage device according to any one of claims 1 to 3, wherein the power storage device is in contact with the insulating plate that is in contact therewith.
  5. 　前記電流遮断装置は、導電性を有するダイアフラムを有し、
    　前記ダイアフラムは、
    　その外周部に位置する外周縁部と、
    　前記外周縁部の内側に位置し、前記ケース内の圧力が上昇すると前記ダイアフラムの変形によって変位する変位部とを有し、
    　前記外周縁部は、前記第１リードおよび前記第２リードの一方と固定されて電気的に接続されており、
    　前記変位部は、前記第１リードおよび前記第２リードの他方と固定されて電気的に接続されており、
    　前記ケース内の圧力が上昇すると、前記第１リードおよび前記第２リードの他方が破断して、電流が流れない状態となる請求項１から４の何れか一項の蓄電装置。     The current interrupt device has a conductive diaphragm,
    The diaphragm is
    An outer peripheral edge located on the outer periphery;
    A displacement portion that is located inside the outer peripheral edge and is displaced by deformation of the diaphragm when the pressure in the case rises;
    The outer peripheral edge portion is fixed and electrically connected to one of the first lead and the second lead,
    The displacement portion is fixed and electrically connected to the other of the first lead and the second lead,
    5. The power storage device according to claim 1, wherein when the pressure in the case increases, the other of the first lead and the second lead breaks and no current flows.
  6. 　前記電流遮断装置は、
    　絶縁性を有するスペーサと、
    　前記第１リードおよび前記第２リードの一方、前記ダイアフラムの外周縁部、前記スペーサ、前記第１リードおよび前記第２リードの他方を、順に重ねた状態で挟持しているカシメ部材と、を備えている請求項１から５の何れか一項の蓄電装置。     The current interrupt device is
    An insulating spacer;
    A caulking member that clamps one of the first lead and the second lead, the outer peripheral edge of the diaphragm, the spacer, and the other of the first lead and the second lead in an overlapping state. The power storage device according to any one of claims 1 to 5.
  7. 　前記蓄電装置は二次電池である請求項１から６の何れか一項の蓄電装置。 The power storage device according to any one of claims 1 to 6, wherein the power storage device is a secondary battery.
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