WO2018012061A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2018012061A1
WO2018012061A1 PCT/JP2017/014224 JP2017014224W WO2018012061A1 WO 2018012061 A1 WO2018012061 A1 WO 2018012061A1 JP 2017014224 W JP2017014224 W JP 2017014224W WO 2018012061 A1 WO2018012061 A1 WO 2018012061A1
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WO
WIPO (PCT)
Prior art keywords
case
holding
electrode terminals
terminal
power storage
Prior art date
Application number
PCT/JP2017/014224
Other languages
French (fr)
Japanese (ja)
Inventor
賢志 濱岡
加藤　崇行
浩生 植田
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 WO2018012061A1 publication Critical patent/WO2018012061A1/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
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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

  • One aspect of the present invention relates to a power storage device.
  • a power storage device is provided with a temperature sensor for detecting the temperature of the device for the purpose of preventing overcharge and overdischarge.
  • a temperature sensor for detecting the temperature of the device for the purpose of preventing overcharge and overdischarge.
  • the temperature detection element is attached to the surface of the case, and whether or not the temperature of the power storage device is excessively increased is monitored based on the temperature detected by the temperature detection element. ing.
  • the temperature of the case surface may become non-uniform due to, for example, the configuration of the electrode assembly housed in the case or the arrangement of electrode terminals provided on the case surface. Conceivable. For this reason, depending on the attachment position of the temperature detection element, it becomes impossible to appropriately detect the temperature rise of the power storage device, and the detection timing of overcharge or overdischarge may be delayed.
  • An object of one aspect of the present invention is to provide a power storage device that can appropriately detect a temperature rise.
  • a power storage device includes a case in which an electrode assembly is accommodated, first and second electrode terminals that have different polarities and are provided on one outer surface side of the case, In FIG. 1, there is an energization plate provided on the energization path between one of the first and second electrode terminals and the electrode assembly, and the energization plate breaks when the internal pressure of the case rises above a predetermined level.
  • a current interrupting device that interrupts the energization path, and a temperature detection element disposed on one outer surface side of the case closer to one of the first and second electrode terminals than the other of the first and second electrode terminals And comprising.
  • This power storage device is provided with a current interrupt device having an energization plate that breaks when the internal pressure of the case rises above a predetermined level.
  • a current interrupting device that breaks the energizing plate
  • the energizing plate is provided with a breaking groove or the energizing plate is thinned. There is. For this reason, the electrical resistance of the current-carrying plate is higher than that of other conductive parts, and in the power storage device, the one where the current interrupting device is not disposed in the vicinity of the electrode terminal where the current interrupting device is disposed.
  • the temperature detection element is arranged closer to the electrode terminal on which the current interrupting device is disposed than on the electrode terminal on which the current interrupting device is not disposed on the outer surface side of one surface of the case. As described above, by arranging the temperature detecting element at a position where the temperature is likely to rise, it is possible to appropriately detect the temperature rise.
  • the current collectors of the plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via the conductive member, and the temperature detection element sandwiches one surface.
  • position so that the connection part of a current collection part and an electrically-conductive member may be opposed.
  • the electric resistance tends to increase and the temperature tends to rise. Therefore, it is possible to more appropriately detect the temperature rise by arranging the temperature detection element so as to face the connection portion across the one surface.
  • the current collectors of the plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via the conductive member, and the temperature detection element sandwiches one surface.
  • position so that a conductive member may be opposed.
  • the temperature tends to rise easily in the vicinity of the electrode terminal where the current interrupting device is disposed and in the connection portion between the current collector of the electrode plate and the conductive member. Therefore, the temperature easily rises even in the conductive member connected to the electrode terminal and the current collector. Therefore, it is possible to more appropriately detect the temperature rise by arranging the temperature detection element so as to face the conductive member across the one surface.
  • the power storage device further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders.
  • An insertion part through which the restraint bolt is inserted and an element holding part for holding the temperature detection element, and between the terminal holding part and the element holding part for holding one of the first and second electrode terminals An insertion part may be arranged.
  • the temperature detection element is arranged close to the electrode terminal where the current interruption device is arranged, the heat transmitted from the electrode terminal to the temperature detection element via the air outside the case can be blocked by the insertion portion, It becomes possible to more appropriately detect the temperature rise.
  • the power storage device further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders.
  • An insertion part through which the restraint bolt is inserted; and an element holding part that holds the temperature detection element; and an element holding part, a terminal holding part that holds one of the first and second electrode terminals, and an insertion part. May be arranged in this order.
  • the temperature detection element can be arranged close to the electrode terminal where the current interruption device is arranged, and the temperature rise can be detected more appropriately.
  • the power storage device further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders.
  • the terminal having an insertion part through which the restraint bolt is inserted and an element holding part for holding the temperature detection element, and holding one of the insertion part, the element holding part, and the first and second electrode terminals.
  • the holding part may be arranged in this order.
  • the temperature detection element can be arranged close to the electrode terminal where the current interruption device is arranged, and the temperature rise can be detected more appropriately.
  • FIG. It is a perspective view of the electrical storage module which concerns on one Embodiment of this invention. It is sectional drawing of the electrical storage apparatus which comprises the electrical storage module shown in FIG. It is sectional drawing which shows the vicinity of the electric current interruption apparatus at the normal time. It is sectional drawing which shows the vicinity of the electric current interruption apparatus at the time of an action
  • the power storage module 1 shown in FIG. 1 is used, for example, as a battery for a vehicle such as a forklift.
  • the power storage module 1 includes an array body 2 in which a plurality (seven in this example) of power storage devices 10 are arrayed, and a restraining member 3 that applies a restraining load to the array body 2 in the array direction. Yes.
  • the power storage devices 10 are arrayed while being held by the holder 61.
  • the configuration of the holder 61 will be described later.
  • the plurality of power storage devices 10 are arranged so that electrode terminals having different polarities are adjacent to each other in the arrangement direction, and are electrically connected in series by a bus bar 7.
  • the restraining member 3 includes, for example, a pair of end plates 4 and 4 disposed at both ends in the arrangement direction with respect to the array 2, a restraining bolt 5 that fastens the end plates 4 and 4, and both ends of the restraining bolt 5. And a nut 6 to be screwed together.
  • four restraint bolts 5 are provided, and each restraint bolt 5 is inserted through the end plates 4 and 4 and each holder 61.
  • the end plates 4, 4 are fastened together by screwing the nut 6 to the restraint bolt 5, and a restraint load is applied to the array 2.
  • the power storage device 10 constituting the power storage module 1 is a secondary battery such as a lithium ion battery, for example. As illustrated in FIG. 2, the power storage device 10 includes a case 11 in which the electrode assembly 12 is accommodated, a positive terminal (first electrode terminal) 21, a negative terminal (second electrode terminal) 31, a current And a shut-off device 8.
  • the case 11 has a main body portion 11a that houses the electrode assembly 12, and a lid portion (one surface) 11b that closes the opening of the main body portion 11a.
  • the main body portion 11a has a rectangular box shape
  • the lid portion 11b has a rectangular flat plate shape.
  • Case 11 consists of metals, such as stainless steel and aluminum, for example.
  • An insulating sheet 13 that insulates between the case 11 and the electrode assembly 12 is provided on the inner surface side of the case 11.
  • a positive electrode terminal 21 and a negative electrode terminal 31 are provided apart from each other on the outer surface side of the lid portion 11b.
  • the positive electrode terminal 21 is disposed on one side in the width direction D of the lid portion 11 b
  • the negative electrode terminal 31 is disposed on the other side in the width direction D.
  • the electrode assembly 12 is a stacked electrode assembly in which positive electrodes (electrode plates) and negative electrodes (electrode plates) are alternately stacked via separators.
  • the separator is, for example, a microporous film, and the separator is impregnated with an electrolytic solution.
  • the separator may be formed, for example, in a bag shape and accommodate the positive electrode, or may be formed in a sheet shape.
  • a united positive electrode may be used in which two sheet-like separators are joined to both sides of the positive electrode.
  • the positive electrode has, for example, a metal foil made of aluminum foil and a positive electrode active material layer formed on both surfaces of the metal foil.
  • the positive electrode active material layer is formed including a positive electrode active material and a binder.
  • the positive electrode active material include composite oxide, metallic lithium, and sulfur.
  • the composite oxide include at least one of manganese, nickel, cobalt, and aluminum, and lithium.
  • a positive electrode current collector 22 is formed at a position inside the width direction D from the positive electrode terminal 21.
  • the positive electrode current collector 22 of each positive electrode is collected on one side in the stacking direction of the electrode assembly 12, for example, and is electrically connected to the positive electrode terminal 21 via the positive electrode conductive member 23.
  • the positive electrode current collector 22 and the positive electrode conductive member 23, and the positive electrode conductive member 23 and the positive electrode terminal 21 are joined by welding, for example.
  • the negative electrode has, for example, a metal foil made of copper foil and a negative electrode active material layer formed on both surfaces of the metal foil.
  • the negative electrode active material layer is formed including a negative electrode active material and a binder.
  • the negative electrode active material include, for example, graphite such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ⁇ x ⁇ 1.5) and the like, and boron-added carbon and the like.
  • a negative electrode current collector 32 is formed at a position inside the width direction D from the negative electrode terminal 31.
  • the negative electrode current collector 32 of each negative electrode is concentrated on one side in the stacking direction of the electrode assembly 12 and is electrically connected to the negative electrode terminal 31 via the negative electrode conductive member 33.
  • a current interrupt device 8 is provided below the negative terminal 31.
  • the current interrupting device 8 is provided between the negative electrode terminal 31 and the negative electrode conductive member 33 and electrically connects the negative electrode terminal 31 and the negative electrode conductive member 33 in series.
  • the negative electrode current collector 32 and the negative electrode conductive member 33, and the negative electrode conductive member 33 and the current interrupt device 8 are joined together by welding, for example.
  • the current interrupting device 8 has an energization path P that connects between the negative electrode terminal 31 and the negative electrode conductive member 33.
  • the current interrupting device 8 interrupts the current flowing between the negative electrode terminal 31 and the negative electrode conductive member 33 by interrupting the energization path P when the internal pressure of the case 11 rises above a predetermined level.
  • the “predetermined level of pressure” means the internal pressure of the case 11 when the power storage device 10 is in an abnormal state such as an overcharged state.
  • the current interrupt device 8 includes a first deformation plate 41, a second deformation plate 42, an energization plate 43, and a terminal portion 44.
  • the first deformable plate 41 and the second deformable plate 42 are, for example, metal diaphragms, and are provided so that the central portion protrudes downward (on the electrode assembly 12 side) at normal times.
  • An insulating protrusion 45 is provided at the center of the upper surface of the first deformation plate 41.
  • the energization plate 43 is disposed between the first deformation plate 41 and the second deformation plate 42.
  • the current-carrying plate 43 and the first deformation plate 41 are in contact with each other at the outer edge, and the current-carrying plate 43 and the second deformation plate 42 are normally in contact with each other at the center.
  • the outer edge of the second deformable plate 42 and the energizing plate 43 are insulated by an annular insulating member 46.
  • the energizing plate 43 is electrically connected to the negative electrode conductive member 33 at the outer edge portion.
  • a breaking groove 43a is provided in the central portion of the energizing plate 43 so as to be surely broken when the internal pressure of the case 11 rises above a predetermined level.
  • the terminal portion 44 is disposed so as to penetrate the opening 11 c formed in the lid portion 11 b and is electrically connected to the second deformation plate 42 in the case 11.
  • the terminal portion 44 includes a substantially disc-shaped plate portion 47, a cylindrical portion 48 extending upward from the central portion of the plate portion 47, a nut portion 49 screwed to the outer peripheral surface of the cylindrical portion 48, and a cylindrical portion A fastening portion 50 for fastening the bus bar 7 is provided on the upper surface of 48 and constitutes the negative electrode terminal 31.
  • the plate part 47 and the cylinder part 48 are formed integrally.
  • the lid portion 11 b is sandwiched between the plate portion 47 and the nut portion 49.
  • the plate portion 47 and the second deformation plate 42 are insulated by an annular insulating member 51.
  • the opening 11c (lid portion 11b) and the terminal portion 44 are insulated by an annular insulating member 52, 53, 54 and hermetically sealed.
  • the current interrupt device 8 is activated.
  • the first deformation plate 41 is deformed upward by the internal pressure of the case 11.
  • the protrusion 45 comes into contact with the central portion of the energizing plate 43
  • the energizing plate 43 is broken starting from the breaking groove 43a, and a part of the energizing plate 43 is separated.
  • a part separated from the energization plate 43 is brought into contact with the central portion of the second deformation plate 42 by the protrusion 45, and the central portion of the second deformation plate 42 is deformed upward.
  • the energization plate 43 and the second deformation plate 42 are not in contact with each other, and the energization path P is irreversibly blocked.
  • the holder 61 is formed of a resin material such as polypropylene, for example, and includes a frame body 62, a pair of terminal holding portions 63 and 63, an insertion portion 64, and an element holding portion 65.
  • the frame body 62 includes a bottom plate 66, a pair of side plates 67 and 67, and a partition plate 68.
  • the pair of side plates 67 and 67 are erected on the edge of the bottom plate 66 in the width direction D so as to face each other.
  • the partition plate 68 connects the side plates 67 and 67 at a position corresponding to the height of the case 11 on one side in the arrangement direction (the back side in the drawing).
  • the bottom surface of the case 11 is on the bottom plate 66
  • both side surfaces in the width direction D are on the side plates 67 and 67, and one side in the arrangement direction.
  • the terminal holding portions 63 and 63 are portions that hold the positive electrode terminal 21 and the negative electrode terminal 31 of the power storage device 10, respectively.
  • the terminal holding parts 63 and 63 are provided on the partition plate 68 at positions corresponding to the positive electrode terminal 21 and the negative electrode terminal 31, respectively.
  • the terminal holding parts 63, 63 surround the positive terminal 21 and the negative terminal 31, respectively, in a state where the case 11 is fitted in the frame body 62.
  • the insertion part 64 is a part through which the restraint bolt 5 of the restraint member 3 is inserted, and in this example, four are provided. Each insertion portion 64 has an insertion hole 64a through which the restraint bolt 5 is inserted. Two four insertion portions 64 are provided on each of the bottom plate 66 and the partition plate 68. The insertion portion 64 on the partition plate 68 side is provided adjacent to the inside of the terminal holding portion 63 on the partition plate 68. The insertion portion 64 on the bottom plate 66 side is provided on the bottom surface side of the bottom plate 66 at the end in the width direction D of the bottom plate 66.
  • the element holding unit 65 is a part that holds the temperature detection element 70.
  • the temperature detection element 70 is provided for the purpose of preventing overcharge and overdischarge of the power storage device 10, and is used for monitoring whether or not the temperature of the power storage device 10 is excessively increased.
  • the temperature detection element 70 is, for example, a thermistor, detects a temperature at a contact position with a detection target, and outputs a detection result to an external control device (not shown) via wiring.
  • the element holding portion 65 is provided on the partition plate 68 adjacent to the terminal holding portion 63 at a position inside the terminal holding portion 63 where the negative electrode terminal 31 is held. That is, in the present embodiment, the insertion portion 64 is disposed between the terminal holding portion 63 that holds the negative electrode terminal 31 and the element holding portion 65.
  • the element holding portion 65 is disposed on the partition plate 68 closer to the terminal holding portion 63 that holds the negative electrode terminal 31 than the terminal holding portion 63 that holds the positive electrode terminal 21. That is, the element holding unit 65 is disposed closer to the terminal holding unit 63 that holds the negative electrode terminal 31 than the terminal holding unit 63 that holds the positive electrode terminal 21.
  • the terminal holding part 63 is disposed so as to face both the connection part C between the negative electrode current collecting part 32 and the negative electrode conductive member 33 and the negative electrode conductive member 33 with the lid part 11 b of the case 11 interposed therebetween. .
  • the temperature detection element 70 held by the element holding portion 65 is disposed closer to the negative electrode terminal 31 than the positive electrode terminal 21 on the outer surface side of the lid portion 11 b in the case 11.
  • the temperature detection element 70 is disposed so as to face both the connection portion C and the negative electrode conductive member 33 with the lid portion 11 b of the case 11 interposed therebetween.
  • the temperature detection element 70 may be in contact with the outer surface of the lid portion 11 b or may be disposed on the outer surface of the lid portion 11 b via one surface of the element holding portion 65.
  • the power storage device 10 described above is provided with the current interrupt device 8 having the energizing plate 43 that breaks when the internal pressure of the case 11 rises above a predetermined level.
  • the energization plate 43 is provided with a breaking groove 43a or the energization plate 43 is scheduled to break. May be thinned. Therefore, the electrical resistance of the current-carrying plate 43 is higher than that of other conductive portions.
  • the current interrupt device 8 is located near the negative electrode terminal 31 on which the current interrupt device 8 is disposed.
  • the temperature detection element 70 is brought closer to the negative electrode terminal 31 where the current interruption device 8 is arranged than the positive electrode terminal 21 where the current interruption device 8 is not arranged. Is arranged. Thus, by arranging the temperature detection element 70 at a position where the temperature is likely to rise, it is possible to appropriately detect the temperature rise.
  • the negative electrode current collector 32 is electrically connected to the negative electrode terminal 31 through the negative electrode conductive member 33 in the case 11, and the negative electrode current collector 32 and the negative electrode are sandwiched by the lid 11 b.
  • the temperature detection element 70 is disposed so as to face the connection portion C with the conductive member 33. In the connection portion C between the negative electrode current collector 32 and the negative electrode conductive member 33, the electric resistance tends to increase and the temperature tends to rise. Therefore, by arranging the temperature detection element 70 so as to face the connection portion C across the lid portion 11b, it is possible to more appropriately detect the temperature rise.
  • the temperature detection element 70 is disposed so as to face the negative electrode conductive member 33 with the lid portion 11b interposed therebetween. As described above, the temperature tends to increase in the vicinity of the negative electrode terminal 31 where the current interrupting device 8 is disposed and in the connection portion C between the negative electrode current collector 32 and the negative electrode conductive member 33. Therefore, the temperature easily rises in the negative electrode conductive member 33 connected to the negative electrode terminal 31 and the negative electrode current collector 32. Therefore, by arranging the temperature detection element 70 so as to face the negative electrode conductive member 33 across the lid portion 11b, it is possible to more appropriately detect the temperature rise.
  • the holder 61 includes a pair of terminal holding portions 63 that respectively hold the positive electrode terminal 21 and the negative electrode terminal 31, an insertion portion 64 through which the restraint bolt 5 is inserted, and an element that holds the temperature detection element 70.
  • the insertion part 64 is disposed between the element holding part 65 and the terminal holding part 63 that has the holding part 65 and holds the negative electrode terminal 31.
  • the temperature detecting element 70 is arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the heat transmitted from the negative electrode terminal 31 to the temperature detecting element 70 via the air outside the case 11 is inserted through the insertion portion 64. The temperature rise can be detected more appropriately.
  • the present invention is not limited to the above embodiment.
  • the insertion portion 64 is provided adjacent to the outside of the terminal holding portion 63, and the element holding portion 65 is provided adjacent to the inside of the terminal holding portion 63. That is, in the first modification example, the element holding portion 65, the terminal holding portion 63 that holds the negative electrode terminal 31, and the insertion portion 64 are arranged in this order from the inner side to the outer side in the width direction D.
  • the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged as in the case of the first embodiment, and the temperature rise is appropriately detected. It becomes possible to do.
  • the element holding portion 65, the terminal holding portion 63 that holds the negative electrode terminal 31, and the insertion portion 64 may be arranged in this order from the outer side to the inner side in the width direction D. Even in this case, the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the temperature rise can be detected appropriately.
  • the element holding portion 65 is provided adjacent to the inside of the terminal holding portion 63, and the insertion portion 64 is provided adjacent to the inside of the element holding portion 65. That is, in the second modification example, the insertion part 64, the element holding part 65, and the terminal holding part 63 that holds the negative electrode terminal 31 are arranged in this order from the inner side to the outer side in the width direction D. Also according to the second modified example, the temperature detecting element 70 can be disposed close to the negative terminal 31 where the current interrupting device 8 is disposed, and the temperature rise can be appropriately detected.
  • the insertion part 64, the element holding part 65, and the terminal holding part 63 that holds the negative electrode terminal 31 may be arranged in this order from the outer side to the inner side in the width direction D. Even in this case, the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the temperature rise can be detected appropriately.
  • the temperature detection element 70 is disposed so as to face both the connecting portion C between the negative electrode current collector 32 and the negative electrode conductive member 33 and the negative electrode conductive member 33 with the lid portion 11b of the case 11 interposed therebetween.
  • the temperature detection element 70 may be arranged so as to face only the negative electrode conductive member 33 with the lid portion 11b interposed therebetween.
  • the temperature detection element 70 can be disposed at a position where the temperature is likely to rise, and the temperature rise can be appropriately detected.
  • the temperature increase can be more appropriately detected when the temperature detection element 70 is disposed so as to face both the connection portion C and the negative electrode conductive member 33 with the lid portion 11b interposed therebetween. This is preferable.
  • the current interrupt device 8 is disposed on the energization path P between the negative electrode terminal 31 and the electrode assembly 12, but the current is present on the energization path between the positive electrode terminal 21 and the electrode assembly 12.
  • a blocking device 8 may be arranged.
  • the current interrupt device 8 may be provided between the positive electrode terminal 21 and the positive electrode conductive member 23, for example, and the positive electrode terminal 21 and the positive electrode conductive member 23 may be electrically connected in series.
  • SYMBOLS 1 Power storage module, 5 ... Restraint bolt, 8 ... Current interruption device, 10 ... Power storage device, 11 ... Case, 11a ... Body part, 11b ... Cover part (one side), 12 ... Electrode assembly, 21 ... Positive electrode terminal 1), 31... Negative electrode terminal (second electrode terminal), 32... Negative electrode current collector, 33... Negative electrode conductive member, 43. , 65 ... element holding part, 70 ... temperature detection element, C ... connection part, P ... energization path.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
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Abstract

A power storage device 10 is provided with: a case 11 in which an electrode assembly 12 is housed; first and second electrode terminals 21, 31 having mutually different polarities, the first and second electrode terminals 21, 31 being provided to the outer-surface side of a lid 11b on the case 11; a current cutoff device 8 which has an energizing plate 43 provided to an energizing path P between one of the first and second electrode terminals 21, 31 and the electrode assembly 12 inside the case, the current cutoff device 8 cutting off the energizing path P by the energizing plate 43 breaking when the internal pressure of the case 11 exceeds a prescribed level; and a temperature detection element 70 disposed closer to one of the first and second electrode terminals 21, 31 than is the other of the first and second electrode terminals 21, 31 at the outer-surface side of the lid 11b on the case 11.

Description

蓄電装置Power storage device
　本発明の一側面は、蓄電装置に関する。 One aspect of the present invention relates to a power storage device.
　従来、蓄電装置として、リチウムイオン電池等の二次電池等が知られている。このような蓄電装置には、過充電や過放電の防止を目的として、装置の温度を検出する温度センサが取り付けられている。例えば、特許文献１に記載された蓄電装置では、温度検出素子がケース表面に取り付けられており、当該温度検出素子が検出した温度に基づいて、蓄電装置の温度の過度な上昇の有無が監視されている。 Conventionally, secondary batteries such as lithium ion batteries are known as power storage devices. Such a power storage device is provided with a temperature sensor for detecting the temperature of the device for the purpose of preventing overcharge and overdischarge. For example, in the power storage device described in Patent Document 1, the temperature detection element is attached to the surface of the case, and whether or not the temperature of the power storage device is excessively increased is monitored based on the temperature detected by the temperature detection element. ing.
特開２００９－１７６６０１号公報JP 2009-176601 A
　しかしながら、蓄電装置の使用時には、例えば、ケース内に収容された電極組立体の構成や、ケース表面に設けられた電極端子の配置等に起因して、ケース表面の温度が不均一になることが考えられる。このため、温度検出素子の取り付け位置によっては、蓄電装置の温度上昇を適切に検知できなくなり、過充電や過放電の検知タイミングが遅延してしまうおそれがある。 However, when the power storage device is used, the temperature of the case surface may become non-uniform due to, for example, the configuration of the electrode assembly housed in the case or the arrangement of electrode terminals provided on the case surface. Conceivable. For this reason, depending on the attachment position of the temperature detection element, it becomes impossible to appropriately detect the temperature rise of the power storage device, and the detection timing of overcharge or overdischarge may be delayed.
　本発明の一側面は、温度上昇を適切に検知できる蓄電装置を提供することを目的とする。 An object of one aspect of the present invention is to provide a power storage device that can appropriately detect a temperature rise.
　本発明の一側面に係る蓄電装置は、電極組立体が収容されたケースと、互いに異なる極性を有し、ケースにおける一面の外面側に設けられた第１及び第２の電極端子と、ケース内において第１及び第２の電極端子の一方と電極組立体との間の通電経路上に設けられた通電板を有し、ケースの内圧が所定レベルを超えて上昇した際に通電板が破断することで通電経路を遮断する電流遮断装置と、ケースにおける一面の外面側において、第１及び第２の電極端子の他方よりも第１及び第２の電極端子の一方寄りに配置された温度検出素子と、を備える。 A power storage device according to one aspect of the present invention includes a case in which an electrode assembly is accommodated, first and second electrode terminals that have different polarities and are provided on one outer surface side of the case, In FIG. 1, there is an energization plate provided on the energization path between one of the first and second electrode terminals and the electrode assembly, and the energization plate breaks when the internal pressure of the case rises above a predetermined level. A current interrupting device that interrupts the energization path, and a temperature detection element disposed on one outer surface side of the case closer to one of the first and second electrode terminals than the other of the first and second electrode terminals And comprising.
　この蓄電装置では、ケースの内圧が所定レベルを超えて上昇した際に破断する通電板を有する電流遮断装置が備えられている。通電板を破断させるタイプの電流遮断装置では、ケース内圧の上昇時の破断容易性を確保するため、通電板に破断溝が設けられる場合や、通電板の破断予定部分が薄化されている場合がある。そのため、通電板の電気抵抗は、他の導電部分と比して高くなり、蓄電装置においては、電流遮断装置が配置されている方の電極端子の近傍では、電流遮断装置が配置されていない方の電極端子の近傍に比べて温度が上昇し易い、という傾向がある。この蓄電装置では、ケースにおける一面の外面側において、電流遮断装置が配置されていない電極端子よりも、電流遮断装置が配置されている電極端子に寄せて温度検出素子が配置されている。このように、温度が上昇し易い位置に温度検出素子が配置することで、温度上昇を適切に検知することが可能となる。 This power storage device is provided with a current interrupt device having an energization plate that breaks when the internal pressure of the case rises above a predetermined level. In the case of a current interrupting device that breaks the energizing plate, in order to ensure the easiness of breaking when the internal pressure of the case increases, the energizing plate is provided with a breaking groove or the energizing plate is thinned. There is. For this reason, the electrical resistance of the current-carrying plate is higher than that of other conductive parts, and in the power storage device, the one where the current interrupting device is not disposed in the vicinity of the electrode terminal where the current interrupting device is disposed. There is a tendency that the temperature is likely to rise as compared with the vicinity of the electrode terminal. In this power storage device, the temperature detection element is arranged closer to the electrode terminal on which the current interrupting device is disposed than on the electrode terminal on which the current interrupting device is not disposed on the outer surface side of one surface of the case. As described above, by arranging the temperature detecting element at a position where the temperature is likely to rise, it is possible to appropriately detect the temperature rise.
　ケース内において、電極組立体を構成する複数の電極板の集電部が導電部材を介して第１及び第２の電極端子の一方と電気的に接続され、温度検出素子は、一面を挟んで集電部と導電部材との接続部分と対向するように配置されていてもよい。電極板の集電部と導電部材との接続部分においては、電気抵抗が高くなり、温度が上昇し易い傾向がある。したがって、一面を挟んで接続部分と対向するように温度検出素子を配置することで、温度上昇を一層適切に検知することが可能となる。 In the case, the current collectors of the plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via the conductive member, and the temperature detection element sandwiches one surface. You may arrange | position so that the connection part of a current collection part and an electrically-conductive member may be opposed. In the connection portion between the current collecting portion and the conductive member of the electrode plate, the electric resistance tends to increase and the temperature tends to rise. Therefore, it is possible to more appropriately detect the temperature rise by arranging the temperature detection element so as to face the connection portion across the one surface.
　ケース内において、電極組立体を構成する複数の電極板の集電部が導電部材を介して第１及び第２の電極端子の一方と電気的に接続され、温度検出素子は、一面を挟んで導電部材と対向するように配置されていてもよい。上述したように、電流遮断装置が配置されている電極端子の近傍、及び電極板の集電部と導電部材との接続部分においては、温度が上昇し易い傾向がある。そのため、当該電極端子と集電部とに接続された導電部材においても、温度が上昇し易くなる。したがって、一面を挟んで導電部材と対向するように温度検出素子を配置することで、温度上昇をより一層適切に検知することが可能となる。 In the case, the current collectors of the plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via the conductive member, and the temperature detection element sandwiches one surface. You may arrange | position so that a conductive member may be opposed. As described above, the temperature tends to rise easily in the vicinity of the electrode terminal where the current interrupting device is disposed and in the connection portion between the current collector of the electrode plate and the conductive member. Therefore, the temperature easily rises even in the conductive member connected to the electrode terminal and the current collector. Therefore, it is possible to more appropriately detect the temperature rise by arranging the temperature detection element so as to face the conductive member across the one surface.
　本発明の一側面に係る蓄電装置は、ケースを保持するホルダを更に備え、ホルダは、第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、複数のホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、温度検出素子を保持する素子保持部と、を有し、第１及び第２の電極端子の一方が保持される端子保持部と素子保持部との間に挿通部が配置されていてもよい。この場合、電流遮断装置が配置されている電極端子に寄せて温度検出素子を配置しつつ、当該電極端子からケース外部の空気を介して温度検出素子に伝わる熱を挿通部によって遮ることができ、温度上昇をより一層適切に検知することが可能となる。 The power storage device according to one aspect of the present invention further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders. An insertion part through which the restraint bolt is inserted and an element holding part for holding the temperature detection element, and between the terminal holding part and the element holding part for holding one of the first and second electrode terminals An insertion part may be arranged. In this case, while the temperature detection element is arranged close to the electrode terminal where the current interruption device is arranged, the heat transmitted from the electrode terminal to the temperature detection element via the air outside the case can be blocked by the insertion portion, It becomes possible to more appropriately detect the temperature rise.
　本発明の一側面に係る蓄電装置は、ケースを保持するホルダを更に備え、ホルダは、第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、複数のホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、温度検出素子を保持する素子保持部と、を有し、素子保持部、第１及び第２の電極端子の一方が保持される端子保持部、挿通部が、この順に配置されていてもよい。この場合、電流遮断装置が配置されている電極端子に寄せて温度検出素子を配置でき、温度上昇をより一層適切に検知することが可能となる。 The power storage device according to one aspect of the present invention further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders. An insertion part through which the restraint bolt is inserted; and an element holding part that holds the temperature detection element; and an element holding part, a terminal holding part that holds one of the first and second electrode terminals, and an insertion part. , May be arranged in this order. In this case, the temperature detection element can be arranged close to the electrode terminal where the current interruption device is arranged, and the temperature rise can be detected more appropriately.
　本発明の一側面に係る蓄電装置は、ケースを保持するホルダを更に備え、ホルダは、第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、複数のホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、温度検出素子を保持する素子保持部と、を有し、挿通部、前記素子保持部、前記第１及び第２の電極端子の一方が保持される前記端子保持部が、この順に配置されていてもよい。この場合、電流遮断装置が配置されている電極端子に寄せて温度検出素子を配置でき、温度上昇をより一層適切に検知することが可能となる。 The power storage device according to one aspect of the present invention further includes a holder that holds the case, and the holder is used for restraining the pair of terminal holding portions that respectively hold the first and second electrode terminals and the plurality of holders. The terminal having an insertion part through which the restraint bolt is inserted and an element holding part for holding the temperature detection element, and holding one of the insertion part, the element holding part, and the first and second electrode terminals. The holding part may be arranged in this order. In this case, the temperature detection element can be arranged close to the electrode terminal where the current interruption device is arranged, and the temperature rise can be detected more appropriately.
　本発明の一側面によれば、温度上昇を適切に検知することが可能となる。 According to one aspect of the present invention, it is possible to appropriately detect a temperature rise.
本発明の一実施形態に係る蓄電モジュールの斜視図である。It is a perspective view of the electrical storage module which concerns on one Embodiment of this invention. 図１に示した蓄電モジュールを構成する蓄電装置の断面図である。It is sectional drawing of the electrical storage apparatus which comprises the electrical storage module shown in FIG. 通常時の電流遮断装置の近傍を示す断面図である。It is sectional drawing which shows the vicinity of the electric current interruption apparatus at the normal time. 作動時の電流遮断装置の近傍を示す断面図である。It is sectional drawing which shows the vicinity of the electric current interruption apparatus at the time of an action | operation. 蓄電モジュールの第１変形例を示す断面図である。It is sectional drawing which shows the 1st modification of an electrical storage module. 蓄電モジュールの第２変形例を示す断面図である。It is sectional drawing which shows the 2nd modification of an electrical storage module.
　以下、本発明の一実施形態について、図面を参照しつつ詳細に説明する。なお、以下の説明において、同一又は相当要素には同一符号を用い、重複する説明を省略する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and duplicate descriptions are omitted.
　図１に示される蓄電モジュール１は、例えば、フォークリフト等の車両のバッテリーとして用いられる。蓄電モジュール１は、複数（この例では、７つ）の蓄電装置１０が配列されてなる配列体２と、配列体２に対して配列方向に拘束荷重を付加する拘束部材３と、を備えている。 The power storage module 1 shown in FIG. 1 is used, for example, as a battery for a vehicle such as a forklift. The power storage module 1 includes an array body 2 in which a plurality (seven in this example) of power storage devices 10 are arrayed, and a restraining member 3 that applies a restraining load to the array body 2 in the array direction. Yes.
　配列体２において、各蓄電装置１０は、ホルダ６１によって保持された状態で配列されている。ホルダ６１の構成については後述する。複数の蓄電装置１０は、極性の異なる電極端子同士が配列方向に隣り合うように配列されており、バスバ７によって電気的に直列に接続されている。 In the array 2, the power storage devices 10 are arrayed while being held by the holder 61. The configuration of the holder 61 will be described later. The plurality of power storage devices 10 are arranged so that electrode terminals having different polarities are adjacent to each other in the arrangement direction, and are electrically connected in series by a bus bar 7.
　拘束部材３は、例えば、配列体２に対して配列方向の両端にそれぞれ配置された一対のエンドプレート４，４と、エンドプレート４，４同士を締結する拘束ボルト５と、拘束ボルト５の両端に螺合されるナット６と、を有している。拘束ボルト５は、この例では４本設けられており、各拘束ボルト５は、エンドプレート４，４及び各ホルダ６１に挿通されている。拘束ボルト５へのナット６の螺合によってエンドプレート４，４同士が締結され、配列体２に拘束荷重が加えられている。 The restraining member 3 includes, for example, a pair of end plates 4 and 4 disposed at both ends in the arrangement direction with respect to the array 2, a restraining bolt 5 that fastens the end plates 4 and 4, and both ends of the restraining bolt 5. And a nut 6 to be screwed together. In this example, four restraint bolts 5 are provided, and each restraint bolt 5 is inserted through the end plates 4 and 4 and each holder 61. The end plates 4, 4 are fastened together by screwing the nut 6 to the restraint bolt 5, and a restraint load is applied to the array 2.
　蓄電モジュール１を構成する蓄電装置１０は、例えばリチウムイオン電池等の二次電池である。図２に示されるように、蓄電装置１０は、電極組立体１２が収容されたケース１１と、正極端子（第１の電極端子）２１と、負極端子（第２の電極端子）３１と、電流遮断装置８と、を備えている。 The power storage device 10 constituting the power storage module 1 is a secondary battery such as a lithium ion battery, for example. As illustrated in FIG. 2, the power storage device 10 includes a case 11 in which the electrode assembly 12 is accommodated, a positive terminal (first electrode terminal) 21, a negative terminal (second electrode terminal) 31, a current And a shut-off device 8.
　ケース１１は、電極組立体１２を収容する本体部１１ａと、本体部１１ａの開口を閉塞する蓋部（一面）１１ｂと、を有している。本体部１１ａは矩形箱状をなし、蓋部１１ｂは矩形平板状をなしている。ケース１１は、例えば、ステンレスやアルミニウム等の金属からなる。ケース１１の内面側には、ケース１１と電極組立体１２との間を絶縁する絶縁シート１３が設けられている。蓋部１１ｂの外面側には、正極端子２１及び負極端子３１が互いに離間して設けられている。正極端子２１は、蓋部１１ｂの幅方向Ｄの一方側に配置され、負極端子３１は、幅方向Ｄの他方側に配置されている。 The case 11 has a main body portion 11a that houses the electrode assembly 12, and a lid portion (one surface) 11b that closes the opening of the main body portion 11a. The main body portion 11a has a rectangular box shape, and the lid portion 11b has a rectangular flat plate shape. Case 11 consists of metals, such as stainless steel and aluminum, for example. An insulating sheet 13 that insulates between the case 11 and the electrode assembly 12 is provided on the inner surface side of the case 11. A positive electrode terminal 21 and a negative electrode terminal 31 are provided apart from each other on the outer surface side of the lid portion 11b. The positive electrode terminal 21 is disposed on one side in the width direction D of the lid portion 11 b, and the negative electrode terminal 31 is disposed on the other side in the width direction D.
　電極組立体１２は、正極（電極板）及び負極（電極板）がセパレータを介して交互に積層された積層型の電極組立体である。セパレータは、例えば微多孔膜であり、セパレータには電解液が含浸されている。セパレータは、例えば袋状に形成されて正極を収容していてもよいし、或いはシート状に形成されていてもよい。例えば、セパレータ付き正極として、正極の両面に２枚のシート状のセパレータが各々接合され、ユニット化された正極が用いられてもよい。 The electrode assembly 12 is a stacked electrode assembly in which positive electrodes (electrode plates) and negative electrodes (electrode plates) are alternately stacked via separators. The separator is, for example, a microporous film, and the separator is impregnated with an electrolytic solution. The separator may be formed, for example, in a bag shape and accommodate the positive electrode, or may be formed in a sheet shape. For example, as a positive electrode with a separator, a united positive electrode may be used in which two sheet-like separators are joined to both sides of the positive electrode.
　正極は、例えばアルミニウム箔からなる金属箔と、金属箔の両面に形成された正極活物質層と、を有している。正極活物質層は、正極活物質とバインダとを含んで形成されている。正極活物質の例としては、例えば、複合酸化物、金属リチウム及び硫黄等が挙げられる。複合酸化物の例にとしては、例えば、マンガン、ニッケル、コバルト及びアルミニウムの少なくとも１つと、リチウムと、が挙げられる。 The positive electrode has, for example, a metal foil made of aluminum foil and a positive electrode active material layer formed on both surfaces of the metal foil. The positive electrode active material layer is formed including a positive electrode active material and a binder. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. Examples of the composite oxide include at least one of manganese, nickel, cobalt, and aluminum, and lithium.
　正極の上縁部（蓋部１１ｂ側の縁部）において、正極端子２１よりも幅方向Ｄの内側の位置には、正極集電部２２が形成されている。各正極の正極集電部２２は、例えば電極組立体１２における積層方向の一方側で集約され、正極導電部材２３を介して正極端子２１に電気的に接続されている。正極集電部２２と正極導電部材２３、及び、正極導電部材２３と正極端子２１とは、例えば溶接によって接合されている。 In the upper edge of the positive electrode (the edge on the lid 11b side), a positive electrode current collector 22 is formed at a position inside the width direction D from the positive electrode terminal 21. The positive electrode current collector 22 of each positive electrode is collected on one side in the stacking direction of the electrode assembly 12, for example, and is electrically connected to the positive electrode terminal 21 via the positive electrode conductive member 23. The positive electrode current collector 22 and the positive electrode conductive member 23, and the positive electrode conductive member 23 and the positive electrode terminal 21 are joined by welding, for example.
　一方、負極は、例えば銅箔からなる金属箔と、金属箔の両面に形成された負極活物質層と、を有している。負極活物質層は、負極活物質とバインダとを含んで形成されている。負極活物質の例としては、例えば、黒鉛、高配向性グラファイト、メソカーボンマイクロビーズ、ハードカーボン及びソフトカーボン等のカーボン、リチウム及びナトリウム等のアルカリ金属、金属化合物、ＳｉＯｘ（０．５≦ｘ≦１．５）等の金属酸化物、並びにホウ素添加炭素等が挙げられる。 On the other hand, the negative electrode has, for example, a metal foil made of copper foil and a negative electrode active material layer formed on both surfaces of the metal foil. The negative electrode active material layer is formed including a negative electrode active material and a binder. Examples of the negative electrode active material include, for example, graphite such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5) and the like, and boron-added carbon and the like.
　負極の上縁部（蓋部１１ｂ側の縁部）において、負極端子３１よりも幅方向Ｄの内側の位置には、負極集電部３２が形成されている。各負極の負極集電部３２は、電極組立体１２における積層方向の一方側で集約され、負極導電部材３３を介して負極端子３１に電気的に接続されている。負極端子３１の下部には、電流遮断装置８が設けられている。電流遮断装置８は、負極端子３１と負極導電部材３３との間に設けられ、負極端子３１と負極導電部材３３とを電気的に直列に接続している。負極集電部３２と負極導電部材３３、及び、負極導電部材３３と電流遮断装置８とは、例えば溶接によって接合されている。 In the upper edge of the negative electrode (the edge on the lid 11b side), a negative electrode current collector 32 is formed at a position inside the width direction D from the negative electrode terminal 31. The negative electrode current collector 32 of each negative electrode is concentrated on one side in the stacking direction of the electrode assembly 12 and is electrically connected to the negative electrode terminal 31 via the negative electrode conductive member 33. A current interrupt device 8 is provided below the negative terminal 31. The current interrupting device 8 is provided between the negative electrode terminal 31 and the negative electrode conductive member 33 and electrically connects the negative electrode terminal 31 and the negative electrode conductive member 33 in series. The negative electrode current collector 32 and the negative electrode conductive member 33, and the negative electrode conductive member 33 and the current interrupt device 8 are joined together by welding, for example.
　続いて、図３及び図４を参照しつつ、電流遮断装置８について説明する。電流遮断装置８は、負極端子３１と負極導電部材３３との間を接続する通電経路Ｐを有している。電流遮断装置８は、ケース１１の内圧が所定レベルを超えて上昇した際に、通電経路Ｐを遮断することによって、負極端子３１と負極導電部材３３との間に流れる電流を遮断する。ここで、「所定レベルの圧力」とは、蓄電装置１０が過充電状態等の異常状態になったときのケース１１の内圧を意味する。電流遮断装置８は、第１変形板４１と、第２変形板４２と、通電板４３と、端子部４４と、を有している。 Subsequently, the current interrupting device 8 will be described with reference to FIGS. 3 and 4. The current interrupt device 8 has an energization path P that connects between the negative electrode terminal 31 and the negative electrode conductive member 33. The current interrupting device 8 interrupts the current flowing between the negative electrode terminal 31 and the negative electrode conductive member 33 by interrupting the energization path P when the internal pressure of the case 11 rises above a predetermined level. Here, the “predetermined level of pressure” means the internal pressure of the case 11 when the power storage device 10 is in an abnormal state such as an overcharged state. The current interrupt device 8 includes a first deformation plate 41, a second deformation plate 42, an energization plate 43, and a terminal portion 44.
　第１変形板４１及び第２変形板４２は、例えば金属製のダイアフラムであり、通常時に中央部が下向き（電極組立体１２側）に突出するように設けられている。第１変形板４１の上面の中央部には、絶縁性を有する突起４５が設けられている。通電板４３は、第１変形板４１と第２変形板４２との間に配置されている。 The first deformable plate 41 and the second deformable plate 42 are, for example, metal diaphragms, and are provided so that the central portion protrudes downward (on the electrode assembly 12 side) at normal times. An insulating protrusion 45 is provided at the center of the upper surface of the first deformation plate 41. The energization plate 43 is disposed between the first deformation plate 41 and the second deformation plate 42.
　通電板４３と第１変形板４１とは互いの外縁部において接触しており、通電板４３と第２変形板４２とは通常時には互いの中央部において接触している。第２変形板４２の外縁部と通電板４３との間は、環状の絶縁部材４６によって絶縁されている。通電板４３は、外縁部において負極導電部材３３に電気的に接続されている。通電板４３の中央部には、ケース１１の内圧が所定レベルを超えて上昇した際に確実に破断するように、破断溝４３ａが設けられている。 The current-carrying plate 43 and the first deformation plate 41 are in contact with each other at the outer edge, and the current-carrying plate 43 and the second deformation plate 42 are normally in contact with each other at the center. The outer edge of the second deformable plate 42 and the energizing plate 43 are insulated by an annular insulating member 46. The energizing plate 43 is electrically connected to the negative electrode conductive member 33 at the outer edge portion. A breaking groove 43a is provided in the central portion of the energizing plate 43 so as to be surely broken when the internal pressure of the case 11 rises above a predetermined level.
　端子部４４は、蓋部１１ｂに形成された開口１１ｃを貫通するように配置され、ケース１１内において第２変形板４２に電気的に接続されている。端子部４４は、略円板状の板部４７と、板部４７の中央部から上側に延在する筒部４８と、筒部４８の外周面に螺合されるナット部４９と、筒部４８の上面にバスバ７を締結するための締結部５０と、有し、負極端子３１を構成している。板部４７と筒部４８とは一体に形成されている。蓋部１１ｂは、板部４７とナット部４９との間で挟まれている。板部４７と第２変形板４２との間は、環状の絶縁部材５１によって絶縁されている。開口１１ｃ（蓋部１１ｂ）と端子部４４との間は、環状の絶縁部材５２，５３，５４によって絶縁されると共に、気密にシールされている。 The terminal portion 44 is disposed so as to penetrate the opening 11 c formed in the lid portion 11 b and is electrically connected to the second deformation plate 42 in the case 11. The terminal portion 44 includes a substantially disc-shaped plate portion 47, a cylindrical portion 48 extending upward from the central portion of the plate portion 47, a nut portion 49 screwed to the outer peripheral surface of the cylindrical portion 48, and a cylindrical portion A fastening portion 50 for fastening the bus bar 7 is provided on the upper surface of 48 and constitutes the negative electrode terminal 31. The plate part 47 and the cylinder part 48 are formed integrally. The lid portion 11 b is sandwiched between the plate portion 47 and the nut portion 49. The plate portion 47 and the second deformation plate 42 are insulated by an annular insulating member 51. The opening 11c (lid portion 11b) and the terminal portion 44 are insulated by an annular insulating member 52, 53, 54 and hermetically sealed.
　例えば蓄電装置１０が過充電状態となってケース１１内でガスが発生し、ケース１１の内圧が所定レベルを超えて上昇した場合、電流遮断装置８が作動する。この作動時には、ケース１１の内圧によって第１変形板４１が上方に変形する。第１変形板４１が上方に変形すると、突起４５が通電板４３の中央部に当接し、通電板４３が破断溝４３ａを起点として破断し、通電板４３の一部が分離される。そして、通電板４３から分離した一部が突起４５によって第２変形板４２の中央部に当接させられ、第２変形板４２の中央部が上方に変形する。その結果、作動時には通電板４３と第２変形板４２とが非接触になり、通電経路Ｐが不可逆的に遮断される。 For example, when the power storage device 10 is overcharged and gas is generated in the case 11 and the internal pressure of the case 11 rises above a predetermined level, the current interrupt device 8 is activated. During this operation, the first deformation plate 41 is deformed upward by the internal pressure of the case 11. When the first deforming plate 41 is deformed upward, the protrusion 45 comes into contact with the central portion of the energizing plate 43, the energizing plate 43 is broken starting from the breaking groove 43a, and a part of the energizing plate 43 is separated. Then, a part separated from the energization plate 43 is brought into contact with the central portion of the second deformation plate 42 by the protrusion 45, and the central portion of the second deformation plate 42 is deformed upward. As a result, during operation, the energization plate 43 and the second deformation plate 42 are not in contact with each other, and the energization path P is irreversibly blocked.
　続いて、図１及び図２を参照しつつ、ホルダ６１の構成について説明する。ホルダ６１は、例えばポリプロピレン等の樹脂材料により形成され、枠体６２と、一対の端子保持部６３，６３と、挿通部６４と、素子保持部６５と、を有している。 Subsequently, the configuration of the holder 61 will be described with reference to FIGS. 1 and 2. The holder 61 is formed of a resin material such as polypropylene, for example, and includes a frame body 62, a pair of terminal holding portions 63 and 63, an insertion portion 64, and an element holding portion 65.
　枠体６２は、底板６６と、一対の側板６７，６７と、仕切板６８と、を有している。一対の側板６７，６７は、互いに対向するように底板６６の幅方向Ｄの縁部に立設されている。仕切板６８は、配列方向の一方側（紙面奥側）において、ケース１１の高さに応じた位置で側板６７，６７同士を連結している。ケース１１がホルダ６１によって保持された状態では、枠体６２内にケース１１が嵌め込まれ、ケース１１の底面が底板６６に、幅方向Ｄの両側面が側板６７，６７に、配列方向の一方側の側面が仕切板６８に、それぞれ接触している。 The frame body 62 includes a bottom plate 66, a pair of side plates 67 and 67, and a partition plate 68. The pair of side plates 67 and 67 are erected on the edge of the bottom plate 66 in the width direction D so as to face each other. The partition plate 68 connects the side plates 67 and 67 at a position corresponding to the height of the case 11 on one side in the arrangement direction (the back side in the drawing). In a state where the case 11 is held by the holder 61, the case 11 is fitted into the frame body 62, the bottom surface of the case 11 is on the bottom plate 66, both side surfaces in the width direction D are on the side plates 67 and 67, and one side in the arrangement direction. Are in contact with the partition plate 68.
　端子保持部６３，６３は、蓄電装置１０の正極端子２１及び負極端子３１をそれぞれ保持する部分である。端子保持部６３，６３は、仕切板６８上において、正極端子２１及び負極端子３１それぞれに対応する位置に設けられている。端子保持部６３，６３は、枠体６２にケース１１が嵌め込まれた状態において、正極端子２１及び負極端子３１をそれぞれ包囲する。 The terminal holding portions 63 and 63 are portions that hold the positive electrode terminal 21 and the negative electrode terminal 31 of the power storage device 10, respectively. The terminal holding parts 63 and 63 are provided on the partition plate 68 at positions corresponding to the positive electrode terminal 21 and the negative electrode terminal 31, respectively. The terminal holding parts 63, 63 surround the positive terminal 21 and the negative terminal 31, respectively, in a state where the case 11 is fitted in the frame body 62.
　挿通部６４は、拘束部材３の拘束ボルト５が挿通される部分であり、この例では４つ設けられている。各挿通部６４は、拘束ボルト５が挿通される挿通孔６４ａを有している。４つの挿通部６４は、底板６６及び仕切板６８のそれぞれに２つずつ設けられている。仕切板６８側の挿通部６４は、仕切板６８上において、端子保持部６３の内側に隣接して設けられている。底板６６側の挿通部６４は、底板６６の幅方向Ｄの端部において、底板６６の底面側に設けられている。 The insertion part 64 is a part through which the restraint bolt 5 of the restraint member 3 is inserted, and in this example, four are provided. Each insertion portion 64 has an insertion hole 64a through which the restraint bolt 5 is inserted. Two four insertion portions 64 are provided on each of the bottom plate 66 and the partition plate 68. The insertion portion 64 on the partition plate 68 side is provided adjacent to the inside of the terminal holding portion 63 on the partition plate 68. The insertion portion 64 on the bottom plate 66 side is provided on the bottom surface side of the bottom plate 66 at the end in the width direction D of the bottom plate 66.
　素子保持部６５は、温度検出素子７０を保持する部分である。温度検出素子７０は、蓄電装置１０の過充電や過放電の防止を目的として設けられるものであり、蓄電装置１０の温度の過度な上昇の有無を監視するために用いられる。温度検出素子７０は、例えばサーミスタであり、検出対象との接触位置において温度を検出し、配線を介して外部の制御装置（図示省略）に検出結果を出力する。 The element holding unit 65 is a part that holds the temperature detection element 70. The temperature detection element 70 is provided for the purpose of preventing overcharge and overdischarge of the power storage device 10, and is used for monitoring whether or not the temperature of the power storage device 10 is excessively increased. The temperature detection element 70 is, for example, a thermistor, detects a temperature at a contact position with a detection target, and outputs a detection result to an external control device (not shown) via wiring.
　素子保持部６５は、仕切板６８上において、負極端子３１が保持された端子保持部６３よりも内側の位置に端子保持部６３に隣接して設けられている。すなわち、本実施形態では、負極端子３１が保持される端子保持部６３と素子保持部６５との間に挿通部６４が配置されている。素子保持部６５は、仕切板６８上において、正極端子２１が保持された端子保持部６３よりも負極端子３１が保持された端子保持部６３寄りに配置されている。すなわち、素子保持部６５は、正極端子２１が保持された端子保持部６３よりも負極端子３１が保持された端子保持部６３の近くに配置されている。また、端子保持部６３は、ケース１１の蓋部１１ｂを挟んで、負極集電部３２と負極導電部材３３との接続部分Ｃ、及び負極導電部材３３の双方と対向するように配置されている。 The element holding portion 65 is provided on the partition plate 68 adjacent to the terminal holding portion 63 at a position inside the terminal holding portion 63 where the negative electrode terminal 31 is held. That is, in the present embodiment, the insertion portion 64 is disposed between the terminal holding portion 63 that holds the negative electrode terminal 31 and the element holding portion 65. The element holding portion 65 is disposed on the partition plate 68 closer to the terminal holding portion 63 that holds the negative electrode terminal 31 than the terminal holding portion 63 that holds the positive electrode terminal 21. That is, the element holding unit 65 is disposed closer to the terminal holding unit 63 that holds the negative electrode terminal 31 than the terminal holding unit 63 that holds the positive electrode terminal 21. Further, the terminal holding part 63 is disposed so as to face both the connection part C between the negative electrode current collecting part 32 and the negative electrode conductive member 33 and the negative electrode conductive member 33 with the lid part 11 b of the case 11 interposed therebetween. .
　これにより、素子保持部６５に保持されている温度検出素子７０は、ケース１１における蓋部１１ｂの外面側において、正極端子２１よりも負極端子３１寄りに配置されている。また、温度検出素子７０は、ケース１１の蓋部１１ｂを挟んで、接続部分Ｃ及び負極導電部材３３の双方と対向するように配置されている。なお、温度検出素子７０は、蓋部１１ｂの外面に接触していてもよいし、素子保持部６５の一面を介して蓋部１１ｂの外面上に配置されていてもよい。 Thus, the temperature detection element 70 held by the element holding portion 65 is disposed closer to the negative electrode terminal 31 than the positive electrode terminal 21 on the outer surface side of the lid portion 11 b in the case 11. The temperature detection element 70 is disposed so as to face both the connection portion C and the negative electrode conductive member 33 with the lid portion 11 b of the case 11 interposed therebetween. Note that the temperature detection element 70 may be in contact with the outer surface of the lid portion 11 b or may be disposed on the outer surface of the lid portion 11 b via one surface of the element holding portion 65.
　以上説明した蓄電装置１０では、ケース１１の内圧が所定レベルを超えて上昇した際に破断する通電板４３を有する電流遮断装置８が備えられている。通電板４３を破断させるタイプの電流遮断装置８では、ケース１１の内圧の上昇時の破断容易性を確保するため、通電板４３に破断溝４３ａが設けられる場合や、通電板４３の破断予定部分が薄化されている場合がある。そのため、通電板４３の電気抵抗は、他の導電部分と比して高くなり、蓄電装置１０においては、電流遮断装置８が配置されている方の負極端子３１の近傍では、電流遮断装置８が配置されていない方の正極端子２１の近傍に比べて温度が上昇し易い、という傾向がある。蓄電装置１０では、ケース１１における蓋部１１ｂの外面側において、電流遮断装置８が配置されていない正極端子２１よりも、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０が配置されている。このように、温度が上昇し易い位置に温度検出素子７０を配置することで、温度上昇を適切に検知することが可能となっている。 The power storage device 10 described above is provided with the current interrupt device 8 having the energizing plate 43 that breaks when the internal pressure of the case 11 rises above a predetermined level. In the current interrupting device 8 of the type that breaks the energization plate 43, in order to ensure the easiness of breakage when the internal pressure of the case 11 is increased, the energization plate 43 is provided with a breaking groove 43a or the energization plate 43 is scheduled to break. May be thinned. Therefore, the electrical resistance of the current-carrying plate 43 is higher than that of other conductive portions. In the power storage device 10, the current interrupt device 8 is located near the negative electrode terminal 31 on which the current interrupt device 8 is disposed. There is a tendency that the temperature is likely to rise as compared with the vicinity of the positive electrode terminal 21 that is not arranged. In the power storage device 10, on the outer surface side of the lid portion 11 b in the case 11, the temperature detection element 70 is brought closer to the negative electrode terminal 31 where the current interruption device 8 is arranged than the positive electrode terminal 21 where the current interruption device 8 is not arranged. Is arranged. Thus, by arranging the temperature detection element 70 at a position where the temperature is likely to rise, it is possible to appropriately detect the temperature rise.
　また、蓄電装置１０では、ケース１１内において、負極集電部３２が負極導電部材３３を介して負極端子３１と電気的に接続されており、蓋部１１ｂを挟んで負極集電部３２と負極導電部材３３との接続部分Ｃと対向するように温度検出素子７０が配置されている。負極集電部３２と負極導電部材３３との接続部分Ｃにおいては、電気抵抗が高くなり、温度が上昇し易い傾向がある。したがって、蓋部１１ｂを挟んで接続部分Ｃと対向するように温度検出素子７０を配置することで、温度上昇を一層適切に検知することが可能となっている。 Further, in the power storage device 10, the negative electrode current collector 32 is electrically connected to the negative electrode terminal 31 through the negative electrode conductive member 33 in the case 11, and the negative electrode current collector 32 and the negative electrode are sandwiched by the lid 11 b. The temperature detection element 70 is disposed so as to face the connection portion C with the conductive member 33. In the connection portion C between the negative electrode current collector 32 and the negative electrode conductive member 33, the electric resistance tends to increase and the temperature tends to rise. Therefore, by arranging the temperature detection element 70 so as to face the connection portion C across the lid portion 11b, it is possible to more appropriately detect the temperature rise.
　また、蓄電装置１０では、蓋部１１ｂを挟んで負極導電部材３３と対向するように温度検出素子７０が配置されている。上述したように、電流遮断装置８が配置されている負極端子３１の近傍、及び負極集電部３２と負極導電部材３３との接続部分Ｃにおいては、温度が上昇し易い傾向がある。そのため、負極端子３１と負極集電部３２とに接続された負極導電部材３３においても、温度が上昇し易くなる。したがって、蓋部１１ｂを挟んで負極導電部材３３と対向するように温度検出素子７０を配置することで、温度上昇をより一層適切に検知することが可能となっている。 Further, in the power storage device 10, the temperature detection element 70 is disposed so as to face the negative electrode conductive member 33 with the lid portion 11b interposed therebetween. As described above, the temperature tends to increase in the vicinity of the negative electrode terminal 31 where the current interrupting device 8 is disposed and in the connection portion C between the negative electrode current collector 32 and the negative electrode conductive member 33. Therefore, the temperature easily rises in the negative electrode conductive member 33 connected to the negative electrode terminal 31 and the negative electrode current collector 32. Therefore, by arranging the temperature detection element 70 so as to face the negative electrode conductive member 33 across the lid portion 11b, it is possible to more appropriately detect the temperature rise.
　また、蓄電装置１０では、ホルダ６１が、正極端子２１及び負極端子３１をそれぞれ保持する一対の端子保持部６３と、拘束ボルト５が挿通される挿通部６４と、温度検出素子７０を保持する素子保持部６５と、を有し、負極端子３１が保持される端子保持部６３と素子保持部６５との間に挿通部６４が配置されている。これにより、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０を配置しつつ、負極端子３１からケース１１外部の空気を介して温度検出素子７０に伝わる熱を挿通部６４によって遮ることができ、温度上昇をより一層適切に検知することが可能となっている。 In the power storage device 10, the holder 61 includes a pair of terminal holding portions 63 that respectively hold the positive electrode terminal 21 and the negative electrode terminal 31, an insertion portion 64 through which the restraint bolt 5 is inserted, and an element that holds the temperature detection element 70. The insertion part 64 is disposed between the element holding part 65 and the terminal holding part 63 that has the holding part 65 and holds the negative electrode terminal 31. As a result, the temperature detecting element 70 is arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the heat transmitted from the negative electrode terminal 31 to the temperature detecting element 70 via the air outside the case 11 is inserted through the insertion portion 64. The temperature rise can be detected more appropriately.
　以上、本発明の一実施形態について説明したが、本発明は、上記実施形態に限られない。例えば、図５に示される第１変形例では、挿通部６４が端子保持部６３の外側に隣接して設けられ、素子保持部６５が端子保持部６３の内側に隣接して設けられている。すなわち、第１変形例では、幅方向Ｄの内側から外側に向けて、素子保持部６５、負極端子３１が保持される端子保持部６３、挿通部６４がこの順に配置されている。このような第１変形例によっても、第１の実施形態の場合と同様に、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０を配置でき、温度上昇を適切に検知することが可能となる。 Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the first modification shown in FIG. 5, the insertion portion 64 is provided adjacent to the outside of the terminal holding portion 63, and the element holding portion 65 is provided adjacent to the inside of the terminal holding portion 63. That is, in the first modification example, the element holding portion 65, the terminal holding portion 63 that holds the negative electrode terminal 31, and the insertion portion 64 are arranged in this order from the inner side to the outer side in the width direction D. Also according to the first modification, the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged as in the case of the first embodiment, and the temperature rise is appropriately detected. It becomes possible to do.
　なお、第１変形例において、幅方向Ｄの外側から内側に向けて、素子保持部６５、負極端子３１が保持される端子保持部６３、挿通部６４がこの順に配置されていてもよい。この場合でも、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０を配置でき、温度上昇を適切に検知することが可能となる。 In the first modification, the element holding portion 65, the terminal holding portion 63 that holds the negative electrode terminal 31, and the insertion portion 64 may be arranged in this order from the outer side to the inner side in the width direction D. Even in this case, the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the temperature rise can be detected appropriately.
　図６に示される第２変形例では、素子保持部６５が端子保持部６３の内側に隣接して設けられ、挿通部６４が素子保持部６５の内側に隣接して設けられている。すなわち、第２変形例では、幅方向Ｄの内側から外側に向けて、挿通部６４、素子保持部６５、負極端子３１が保持される端子保持部６３がこの順に配置されている。このような第２変形例によっても、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０を配置でき、温度上昇を適切に検知することが可能となる。 6, the element holding portion 65 is provided adjacent to the inside of the terminal holding portion 63, and the insertion portion 64 is provided adjacent to the inside of the element holding portion 65. That is, in the second modification example, the insertion part 64, the element holding part 65, and the terminal holding part 63 that holds the negative electrode terminal 31 are arranged in this order from the inner side to the outer side in the width direction D. Also according to the second modified example, the temperature detecting element 70 can be disposed close to the negative terminal 31 where the current interrupting device 8 is disposed, and the temperature rise can be appropriately detected.
　なお、第２変形例において、幅方向Ｄの外側から内側に向けて、挿通部６４、素子保持部６５、負極端子３１が保持される端子保持部６３がこの順に配置されていてもよい。この場合でも、電流遮断装置８が配置されている負極端子３１に寄せて温度検出素子７０を配置でき、温度上昇を適切に検知することが可能となる。 In the second modification, the insertion part 64, the element holding part 65, and the terminal holding part 63 that holds the negative electrode terminal 31 may be arranged in this order from the outer side to the inner side in the width direction D. Even in this case, the temperature detection element 70 can be arranged close to the negative electrode terminal 31 where the current interrupting device 8 is arranged, and the temperature rise can be detected appropriately.
　上記実施形態では、ケース１１の蓋部１１ｂを挟んで負極集電部３２と負極導電部材３３との接続部分Ｃ及び負極導電部材３３の双方と対向するように温度検出素子７０が配置されていたが、蓋部１１ｂを挟んで負極導電部材３３のみと対向するように温度検出素子７０が配置されてもよい。この場合にも、上記実施形態と同様に、温度が上昇し易い位置に温度検出素子７０を配置でき、温度上昇を適切に検知することが可能となる。ただし、上記実施形態のように、蓋部１１ｂを挟んで接続部分Ｃ及び負極導電部材３３の双方と対向するように温度検出素子７０が配置されている方が、温度上昇を一層適切に検知できる点で好ましい。 In the above embodiment, the temperature detection element 70 is disposed so as to face both the connecting portion C between the negative electrode current collector 32 and the negative electrode conductive member 33 and the negative electrode conductive member 33 with the lid portion 11b of the case 11 interposed therebetween. However, the temperature detection element 70 may be arranged so as to face only the negative electrode conductive member 33 with the lid portion 11b interposed therebetween. Also in this case, similarly to the above-described embodiment, the temperature detection element 70 can be disposed at a position where the temperature is likely to rise, and the temperature rise can be appropriately detected. However, as in the above-described embodiment, the temperature increase can be more appropriately detected when the temperature detection element 70 is disposed so as to face both the connection portion C and the negative electrode conductive member 33 with the lid portion 11b interposed therebetween. This is preferable.
　上記実施形態では、負極端子３１と電極組立体１２との間の通電経路Ｐ上に電流遮断装置８が配置されていたが、正極端子２１と電極組立体１２との間の通電経路上に電流遮断装置８が配置されてもよい。この場合、電流遮断装置８は、例えば、正極端子２１と正極導電部材２３との間に設けられ、正極端子２１と正極導電部材２３とを電気的に直列に接続してもよい。 In the above embodiment, the current interrupt device 8 is disposed on the energization path P between the negative electrode terminal 31 and the electrode assembly 12, but the current is present on the energization path between the positive electrode terminal 21 and the electrode assembly 12. A blocking device 8 may be arranged. In this case, the current interrupt device 8 may be provided between the positive electrode terminal 21 and the positive electrode conductive member 23, for example, and the positive electrode terminal 21 and the positive electrode conductive member 23 may be electrically connected in series.
１…蓄電モジュール、５…拘束ボルト、８…電流遮断装置、１０…蓄電装置、１１…ケース、１１ａ…本体部、１１ｂ…蓋部（一面）、１２…電極組立体、２１…正極端子（第１の電極端子）、３１…負極端子（第２の電極端子）、３２…負極集電部、３３…負極導電部材、４３…通電板、６１…ホルダ、６３…端子保持部、６４…挿通部、６５…素子保持部、７０…温度検出素子、Ｃ…接続部分、Ｐ…通電経路。 DESCRIPTION OF SYMBOLS 1 ... Power storage module, 5 ... Restraint bolt, 8 ... Current interruption device, 10 ... Power storage device, 11 ... Case, 11a ... Body part, 11b ... Cover part (one side), 12 ... Electrode assembly, 21 ... Positive electrode terminal 1), 31... Negative electrode terminal (second electrode terminal), 32... Negative electrode current collector, 33... Negative electrode conductive member, 43. , 65 ... element holding part, 70 ... temperature detection element, C ... connection part, P ... energization path.

Claims (6)

  1. 　電極組立体が収容されたケースと、
    　互いに異なる極性を有し、前記ケースにおける一面の外面側に設けられた第１及び第２の電極端子と、
    　前記ケース内において前記第１及び第２の電極端子の一方と前記電極組立体との間の通電経路上に設けられた通電板を有し、前記ケースの内圧が所定レベルを超えて上昇した際に前記通電板が破断することで前記通電経路を遮断する電流遮断装置と、
    　前記ケースにおける前記一面の外面側において、前記第１及び第２の電極端子の他方よりも前記第１及び第２の電極端子の一方寄りに配置された温度検出素子と、を備える蓄電装置。     A case containing the electrode assembly;
    First and second electrode terminals having different polarities and provided on one outer surface side of the case;
    In the case, having an energization plate provided on an energization path between one of the first and second electrode terminals and the electrode assembly, and when the internal pressure of the case rises above a predetermined level A current interrupting device that interrupts the energization path by breaking the energization plate;
    A power storage device comprising: a temperature detection element disposed on an outer surface side of the one surface of the case, closer to one of the first and second electrode terminals than the other of the first and second electrode terminals.
  2. 　前記ケース内において、前記電極組立体を構成する複数の電極板の集電部が導電部材を介して前記第１及び第２の電極端子の一方と電気的に接続され、
    　前記温度検出素子は、前記一面を挟んで前記集電部と前記導電部材との接続部分と対向するように配置されている、請求項１に記載の蓄電装置。     In the case, current collectors of a plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via a conductive member,
    The power storage device according to claim 1, wherein the temperature detection element is disposed so as to face a connection portion between the current collector and the conductive member with the one surface interposed therebetween.
  3. 　前記ケース内において、前記電極組立体を構成する複数の電極板の集電部が導電部材を介して前記第１及び第２の電極端子の一方と電気的に接続され、
    　前記温度検出素子は、前記一面を挟んで前記導電部材と対向するように配置されている、請求項１又は２に記載の蓄電装置。     In the case, current collectors of a plurality of electrode plates constituting the electrode assembly are electrically connected to one of the first and second electrode terminals via a conductive member,
    The power storage device according to claim 1, wherein the temperature detection element is disposed so as to face the conductive member across the one surface.
  4. 　前記ケースを保持するホルダを更に備え、
    　前記ホルダは、
    　　前記第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、
    　　複数の前記ホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、
    　　前記温度検出素子を保持する素子保持部と、を有し、
    　前記第１及び第２の電極端子の一方が保持される前記端子保持部と前記素子保持部との間に前記挿通部が配置されている、請求項１～３のいずれか一項に記載の蓄電装置。     A holder for holding the case;
    The holder is
    A pair of terminal holding portions respectively holding the first and second electrode terminals;
    An insertion part through which a constraint bolt used for restraining the plurality of holders is inserted;
    An element holding part for holding the temperature detection element,
    The insertion portion is disposed between the terminal holding portion that holds one of the first and second electrode terminals and the element holding portion, according to any one of claims 1 to 3. Power storage device.
  5. 　前記ケースを保持するホルダを更に備え、
    　前記ホルダは、
    　　前記第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、
    　　複数の前記ホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、
    　　前記温度検出素子を保持する素子保持部と、を有し、
    　前記素子保持部、前記第１及び第２の電極端子の一方が保持される前記端子保持部、前記挿通部が、この順に配置されている、請求項１～３のいずれか一項に記載の蓄電装置。     A holder for holding the case;
    The holder is
    A pair of terminal holding portions respectively holding the first and second electrode terminals;
    An insertion part through which a constraint bolt used for restraining the plurality of holders is inserted;
    An element holding part for holding the temperature detection element,
    The device holding section, the terminal holding section that holds one of the first and second electrode terminals, and the insertion section are arranged in this order. Power storage device.
  6. 　前記ケースを保持するホルダを更に備え、
    　前記ホルダは、
    　　前記第１及び第２の電極端子をそれぞれ保持する一対の端子保持部と、
    　　複数の前記ホルダの拘束に用いられる拘束ボルトが挿通される挿通部と、
    　　前記温度検出素子を保持する素子保持部と、を有し、
    　前記挿通部、前記素子保持部、前記第１及び第２の電極端子の一方が保持される前記端子保持部が、この順に配置されている、請求項１～３のいずれか一項に記載の蓄電装置。     A holder for holding the case;
    The holder is
    A pair of terminal holding portions respectively holding the first and second electrode terminals;
    An insertion part through which a constraint bolt used for restraining the plurality of holders is inserted;
    An element holding part for holding the temperature detection element,
    The terminal insertion part, the element holding part, and the terminal holding part that holds one of the first and second electrode terminals are arranged in this order. Power storage device.
PCT/JP2017/014224 2016-07-15 2017-04-05 Power storage device WO2018012061A1 (en)

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JP2016018740A (en) * 2014-07-10 2016-02-01 株式会社豊田自動織機 Battery module

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JP2015141790A (en) * 2014-01-28 2015-08-03 トヨタ自動車株式会社 battery system
JP2016018740A (en) * 2014-07-10 2016-02-01 株式会社豊田自動織機 Battery module

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