WO2021187133A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2021187133A1
WO2021187133A1 PCT/JP2021/008442 JP2021008442W WO2021187133A1 WO 2021187133 A1 WO2021187133 A1 WO 2021187133A1 JP 2021008442 W JP2021008442 W JP 2021008442W WO 2021187133 A1 WO2021187133 A1 WO 2021187133A1
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WO
WIPO (PCT)
Prior art keywords
power storage
spacer
storage element
facing portion
facing
Prior art date
Application number
PCT/JP2021/008442
Other languages
French (fr)
Japanese (ja)
Inventor
駿 佐々木
Original Assignee
株式会社Ｇｓユアサ
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Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Publication of WO2021187133A1 publication Critical patent/WO2021187133A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • 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 present invention relates to a power storage device including a power storage element and spacers arranged on the sides of the power storage element.
  • Patent Document 1 discloses a battery module including a pair of end cell holders arranged at both ends in a stacking direction of a secondary battery and a plurality of intermediate cell holders arranged between the secondary batteries. ..
  • a pair of side plates are arranged outside the pair of end cell holders, and both ends of the pair of side plates in the width direction are fastened by a pair of side frames extending in the stacking direction of the secondary batteries. ..
  • the periphery of the laminate composed of the end cell holder, the intermediate cell holder, and the secondary battery is fixed by the pair of side plates and the pair of side frames.
  • a cell holder (spacer) is arranged at the end of the secondary battery (storage element) in the arrangement direction, and a side plate (plate member) is arranged on the outside thereof. That is, a spacer formed of an insulating material such as resin is arranged between the adjacent power storage elements and the metal plate member at the end of the power storage element row. As a result, electrical insulation between the power storage elements adjacent to each other and the plate member is achieved.
  • a spacer formed of an insulating material such as resin is arranged between the adjacent power storage elements and the metal plate member at the end of the power storage element row.
  • the present invention has been made by the inventor of the present application paying new attention to the above problems, and an object of the present invention is to provide a power storage device having a simple configuration and improved safety.
  • the power storage device includes a power storage element, a conductive plate member, and a spacer, and the spacer is provided between a first side surface of the power storage element and a side surface of the plate member. It has an arranged spacer main body and an opposing portion arranged at an end portion of the spacer main body so as to face the end surface of the plate member.
  • FIG. 1 is a perspective view showing the appearance of the power storage device according to the embodiment.
  • FIG. 2 is an exploded perspective view of the power storage device according to the embodiment.
  • FIG. 3 is an exploded perspective view of the power storage unit according to the embodiment.
  • FIG. 4 is a cut view showing a part of the internal configuration of the exterior body according to the embodiment.
  • FIG. 5A is a first perspective view showing the appearance of the spacer according to the embodiment.
  • FIG. 5B is a second perspective view showing the appearance of the spacer according to the embodiment.
  • FIG. 6 is a cross-sectional view of the facing portion of the lower end portion of the spacer according to the embodiment and the periphery thereof.
  • FIG. 7 is an enlarged cross-sectional view of the facing portion shown in FIG.
  • FIG. 8 is an enlarged cross-sectional view of the facing portion of the upper end portion of the spacer according to the embodiment.
  • the power storage device includes a power storage element, a conductive plate member, and a spacer, and the spacer is provided between a first side surface of the power storage element and a side surface of the plate member. It has an arranged spacer main body and an opposing portion arranged at an end portion of the spacer main body so as to face the end surface of the plate member.
  • the plate member arranged for the purpose of restraining or holding the power storage element and the power storage element are mainly electrically insulated by the spacer body of the spacer. Since the facing portion of the spacer is arranged to face the end face of the plate member, the creepage distance between the plate member and the power storage element at the end of the spacer is increased.
  • the power storage device according to this aspect can secure the insulation between the power storage elements adjacent to each other and the plate member with a simple configuration. Specifically, since the spacer has the facing portion, the creepage distance between the plate member and the power storage element is increased, and as a result, the safety of the power storage device is improved.
  • the facing portion may have a first facing portion facing the end surface of the plate member and a second facing portion of the power storage element facing the second side surface adjacent to the first side surface.
  • the spacer is arranged not only on the end surface of the plate member but also on the second side surface of the power storage element located on the side of the end surface. Therefore, the creepage distance between the plate member and the power storage element at the end of the spacer is further increased, which further improves safety.
  • the protruding length of the second facing portion from the spacer main body may be shorter than the protruding length of the first facing portion from the spacer main body.
  • the first facing portion can be provided facing a wide range of the end faces of the plate members, and the second facing portion is provided with the second side surface of the power storage element exposed more.
  • a wide range of the second side surface which is the bottom surface of the power storage element, can be directly adhered to a predetermined fixed surface such as the inner bottom surface of the exterior body. That is, the vibration resistance or impact resistance of the power storage device can be improved by increasing the creepage distance between the power storage element and the plate member at the lower end of the spacer and firmly fixing the power storage element.
  • the thickness of the first facing portion may be different from the thickness of the second facing portion.
  • the thicknesses of the first facing portion and the second facing portion can be independently determined according to the sizes of the plate member and the power storage element and the relative positions of the plate members with respect to the power storage element. That is, since the degree of freedom in the shape and size of the facing portion is high, the shape and size of the facing portion can be made into a shape or size for further extending the creepage distance by the facing portion.
  • the facing portion may extend along the end face of the plate member.
  • the creepage distance between the plate member having substantially the same size as the long side surface and the power storage element (the creepage at the spacer end). Distance) is increased. That is, the effect of increasing the creepage distance can be obtained in a wide range, and as a result, the safety of the power storage device is further improved.
  • the alignment direction of the pair of (positive electrode side and negative electrode side) electrode terminals in one storage element, the opposite direction of the short side surface of the container of the storage element, or the arrangement direction of the pair of side plates Defined as the X-axis direction.
  • the arrangement direction of the plurality of power storage elements, the opposite direction of the long side surfaces of the container of the power storage elements, or the arrangement direction of the pair of end plates is defined as the Y-axis direction.
  • the alignment direction of the outer body body and the lid of the power storage device, the arrangement direction of the container body and the lid of the power storage element, the arrangement direction of the power storage element and the bus bar, or the vertical direction is defined as the Z-axis direction.
  • X-axis directions, Y-axis directions, and Z-axis directions are directions that intersect each other (orthogonally in the present embodiment).
  • the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction.
  • the X-axis plus direction indicates the arrow direction of the X-axis
  • the X-axis minus direction indicates the direction opposite to the X-axis plus direction.
  • the Y-axis direction and the Z-axis direction are not strictly the directions or postures.
  • the fact that two directions are orthogonal not only means that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, a difference of, for example, about several percent. It also means to include.
  • FIG. 1 is a perspective view showing the appearance of the power storage device 10 according to the embodiment.
  • FIG. 2 is an exploded perspective view of the power storage device 10 according to the embodiment.
  • FIG. 3 is an exploded perspective view of the power storage unit 200 according to the embodiment.
  • the power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment.
  • the power storage device 10 is a battery module (assembled battery) used for power storage, power supply, and the like.
  • the power storage device 10 is used for driving a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railroad vehicle for an electric railway, or for starting an engine. Used as a battery or the like.
  • Examples of the above-mentioned automobiles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and gasoline vehicles.
  • Examples of the railway vehicle for the electric railway include a train, a monorail, and a linear motor car.
  • the power storage device 10 can also be used as a stationary battery or the like used for home use, a generator, or the like.
  • the power storage device 10 includes an exterior body 100. As shown in FIGS. 2 and 3, a power storage unit 200 having a power storage element row 201 composed of a plurality of power storage elements 210 is arranged inside the exterior body 100.
  • the power storage device 10 includes a bus bar frame on which a bus bar is mounted, a circuit board for monitoring the charge state and discharge state of the power storage element 210, electric devices such as fuses, relays and connectors, and an electric device.
  • An exhaust unit or the like for exhausting the gas discharged from the power storage element 210 to the outside of the exterior body 100 may be provided.
  • the power storage unit 200 has a power storage element row 201 in which a plurality of power storage elements 210 are arranged, a plurality of spacers 300 (301, 302), a pair of end plates 400, and a pair of side plates 500.
  • the plurality of power storage elements 210 are connected in series, for example, by a plurality of bus bars (not shown).
  • the exterior body 100 is a box-shaped (substantially rectangular parallelepiped) container (module case) that constitutes the exterior body of the power storage device 10. That is, the exterior body 100 fixes the power storage unit 200 or the like at a predetermined position and protects it from impact or the like.
  • the exterior body 100 includes, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (including modified PPE).
  • PET polybutylene terephthalate
  • PBT polybutylene terephthalate
  • PEEK polyether ether ketone
  • PFA tetrafluoroethylene / perfluoroalkyl vinyl ether
  • PFS polytetrafluoroethylene
  • ABS resin or , It is formed of an insulating member such as a composite material thereof, or an insulating coated metal or the like.
  • the exterior body 100 may be formed of a conductive member such as metal as long as the electrical insulation of the power storage element 210 or the like is maintained.
  • the exterior body 100 has an exterior body body 110 that constitutes the main body of the exterior body 100, and an exterior body lid body 120 that constitutes the lid body of the exterior body 100.
  • the exterior body body 110 is a bottomed rectangular cylindrical housing (housing) having an opening, and accommodates a power storage element 210 and the like.
  • the exterior body lid 120 is a flat rectangular member that closes the opening of the exterior body body 110.
  • the exterior body lid 120 is joined to the exterior body 110 by an adhesive, heat seal, ultrasonic welding, or the like.
  • the exterior body lid 120 is provided with a positive electrode external terminal 121 and a negative electrode external terminal 122.
  • the positive electrode external terminal 121 is electrically connected to the electrode terminal 220, which is the total positive terminal of the power storage unit 200.
  • the negative electrode external terminal 122 is electrically connected to the electrode terminal 220, which is the total negative terminal of the power storage unit 200.
  • the power storage device 10 charges electricity from the outside and discharges electricity to the outside via the positive electrode external terminal 121 and the negative electrode external terminal 122.
  • the power storage element 210 is a secondary battery (cell battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the power storage element 210 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, the power storage element row 201 is formed by arranging the four power storage elements 210 side by side in the Y-axis direction. There is.
  • the size and shape of the power storage element 210 and the number of power storage elements 210 arranged are not limited, and for example, only one power storage element 210 may be arranged.
  • the power storage element 210 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor.
  • the power storage element 210 may be a primary battery that can use the stored electricity without being charged by the user, instead of the secondary battery.
  • the power storage element 210 includes a container 211 and a pair (positive electrode side and negative electrode side) of electrode terminals 220 (see FIG. 3).
  • An electrode body, a pair of current collectors, an electrolytic solution (non-aqueous electrolyte), and the like are housed inside the container 211, and a gasket is provided between the container 211 and the electrode terminal 220 and the current collector.
  • the type of the electrolytic solution is not particularly limited as long as it does not impair the performance of the power storage element 210, and various types can be selected.
  • the power storage element 210 may include a spacer arranged on the side of the current collector, an insulating sheet covering the outer surface of the container 211, and the like.
  • the container 211 is a rectangular parallelepiped (square) container having a container body having an opening and a lid portion that closes the opening of the container body and forms the top surface 211d of the container 211.
  • the container 211 is made of, for example, stainless steel, aluminum, an aluminum alloy, iron, a metal such as a plated steel plate, or the like.
  • the container 211 has a posture in which the long side surface 211b faces the Y-axis direction and the short side surface 211c faces the X-axis direction, that is, the pair of long side surfaces 211b faces the Y-axis direction.
  • a pair of short side surfaces 211c are arranged so as to face each other and face each other in the X-axis direction.
  • a gas discharge valve 230 that releases the pressure inside the container 211 when the pressure inside the container 211 rises is provided on the top surface 211d of the container 211 (see FIG. 3). That is, in the container 211, the gas discharge valve 230 is arranged on the top surface 211d (upper surface of the lid portion) facing the bottom surface 211a, which is the surface of the container 211 on the negative direction side of the Z axis.
  • the electrode terminal 220 is a terminal (positive electrode terminal or negative electrode terminal) of the power storage element 210 arranged on the Z-axis plus direction side surface (cover portion) of the container 211.
  • the electrode terminal 220 is electrically connected to the positive electrode plate or the negative electrode plate of the electrode body via a current collector. That is, each of the pair of electrode terminals 220 leads the electricity stored in the electrode body to the external space of the power storage element 210, and introduces electricity into the internal space of the power storage element 210 in order to store electricity in the electrode body. It is a metal member of.
  • the electrode terminal 220 is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like.
  • the electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.
  • the positive electrode plate is a positive electrode active material layer formed on a positive electrode base material layer which is a current collecting foil made of a metal such as aluminum or an aluminum alloy.
  • the negative electrode plate is a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of a metal such as copper or a copper alloy.
  • the active material used for the positive electrode active material layer and the negative electrode active material layer known materials can be appropriately used as long as they can occlude and release lithium ions.
  • the electrode body is a wound electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating a plurality of flat plate-shaped electrode plates.
  • a wound electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating a plurality of flat plate-shaped electrode plates.
  • Any form of electrode body such as a body or a bellows-shaped electrode body obtained by folding a electrode plate into a bellows shape may be used.
  • the current collector is a conductive member (positive electrode current collector or negative electrode current collector) that is electrically connected to the electrode terminal 220 and the electrode body.
  • the positive electrode current collector is formed of aluminum or an aluminum alloy or the like like the positive electrode base material layer of the positive electrode plate
  • the negative electrode current collector is formed of copper or a copper alloy or the like like the negative electrode base material layer of the negative electrode plate.
  • the spacers 300 are arranged on the side of the power storage element 210 (Y-axis plus direction or Y-axis minus direction), and have a rectangular shape and a plate shape that electrically insulate the power storage element 210 from other members. It is a member of.
  • the spacer 301 is a member that is arranged between two adjacent power storage elements 210 and electrically insulates between the two power storage elements 210.
  • the spacer 301 is, for example, a member called an inter-cell spacer.
  • the spacer 302 is a member that is arranged between the power storage element 210 at the end and the end plate 400, and electrically insulates between the power storage element 210 at the end and the end plate 400.
  • the spacer 302 is a member called, for example, an end spacer.
  • Each of the spacers 301 and 302 is arranged so as to cover both sides of the power storage element 210 in the X-axis direction (the side of the short side surface 211c), and electrically insulates between the power storage element 210 and the side plate 500.
  • three spacers 301 and two spacers 302 are arranged corresponding to the four power storage elements 210.
  • the number of power storage elements 210 is other than 4
  • the number of spacers 301 is also appropriately changed according to the number of power storage elements 210.
  • the spacer 300 is made of, for example, any electrically insulating resin material that can be used for the exterior body 100.
  • the spacer 302 arranged between the power storage element 210 and the end plate 400 has a portion facing the end surface of the end plate 400 located on the side. As a result, the electrical insulation between the power storage elements 210 and the end plate 400 that are adjacent to each other with the spacer 302 in between is improved. Details of the spacer 302 will be described later with reference to FIGS. 4 to 8.
  • the end plate 400 and the side plate 500 are restraining members that press (constrain) the power storage element row 201 from the outside in the arrangement direction (Y-axis direction) of the power storage element 210 in the electric element row 201. That is, the pair of end plates 400 sandwich the power storage element row 201 from both sides in the arrangement direction, and the pair of side plates 500 exert a binding force on the pair of end plates 400. As a result, each of the power storage elements 210 included in the power storage element row 201 is compressed (constrained) from both sides in the arrangement direction.
  • the end plate 400 is an example of a plate member.
  • the side plate 500 is connected (joined) to the end plate 400 by a plurality of nuts 500a arranged in the Z-axis direction (see FIG. 3). Specifically, the nut 500a is screwed into the threaded portion of the end plate 400 penetrating the side plate 500 and fastened to the threaded portion.
  • the end plate 400 and the side plate 500 are made of a metal such as iron, stainless steel, or an aluminum alloy.
  • the reinforcing member 40 is arranged on the outside of the exterior body 100.
  • the reinforcing member 40 is a member made of a high-strength material such as iron, and has a function of enhancing the impact resistance of the power storage device 10.
  • the reinforcing member 40 is arranged along the bottom wall 115 of the exterior body 100, and the reinforcing member 40 is fixed to the exterior body 100 by four bolts 80. ..
  • FIG. 4 is a cut view showing a part of the internal configuration of the exterior body 100 according to the embodiment.
  • a part of the exterior body 110 is cut out on a YZ plane parallel to the IV-IV line of FIG. 2, and the power storage unit 200 is floated from the bottom wall 115 of the exterior body 110.
  • FIG. 5A is a first perspective view showing the appearance of the spacer 302 according to the embodiment
  • FIG. 5B is a second perspective view showing the appearance of the spacer 302 according to the embodiment.
  • FIG. 5A is a first perspective view showing the appearance of the spacer 302 according to the embodiment
  • FIG. 5B is a second perspective view showing the appearance of the spacer 302 according to the embodiment.
  • FIG. 6 is a cross-sectional view of the facing portion 320 at the lower end of the spacer 302 and its periphery according to the embodiment.
  • FIG. 6 shows a part of a cross section of the power storage device 10 in the YZ plane passing through the VI-VI line of FIG.
  • FIG. 7 is an enlarged cross-sectional view of the facing portion 320 shown in FIG.
  • FIG. 8 is an enlarged cross-sectional view of the facing portion 324 of the upper end portion of the spacer 302 according to the embodiment.
  • the cross section of the facing portion 324 in the YZ plane passing through the VIII-VIII line of FIG. 5A is shown together with the cross section of the end plate 400 in the same plane.
  • the inner bottom surface 113 is an inner surface (a surface on the inner side of the exterior body 100) of the bottom wall 115 of the exterior body 100 (exterior body main body 110).
  • the inner bottom surface 113 has a mounting surface portion 113a on which the power storage element 210 is mounted, and a fixed surface portion 113b in which a through hole through which the bolt 80 penetrates is formed.
  • the bolt 80 penetrates the through hole of the bottom wall 115 of the exterior body 100 and is screwed into the screw hole of the reinforcing member 40 to fix the reinforcing member 40 to the exterior body 100.
  • the spacer 302 is arranged outside the power storage element 210 at the end in the arrangement direction of the power storage element row 201 of the power storage unit 200.
  • the spacer 302 plays a role of electrically insulating the power storage element 210 and the end plate 400 at the end of the power storage element row 201.
  • the spacer 302 has a spacer main body 302a and an opposing portion 320.
  • the spacer body 302a is a portion arranged between the long side surface 211b of the power storage element 210 and the side surface of the end plate 400 (specifically, the side surface in the thickness direction (Y-axis direction)).
  • the long side surface 211b is an example of the first side surface.
  • the facing portion 320 is a portion provided at the end of the spacer main body 302a and facing the end surface 401 of the end plate 400. Specifically, the facing portion 320 is arranged at the lower end portion of the spacer main body 302a, and has a first facing portion 321 and a second facing portion 322. As shown in FIGS. 6 and 7, the first facing portion 321 is a portion facing the lower end surface 401 of the end plate 400. As shown in FIGS. 6 and 7, the second facing portion 322 is a portion of the power storage element 210 facing the bottom surface 211a adjacent to the long side surface 211b. The bottom surface 211a is an example of the second side surface.
  • the ranges of the container 211 and the end plate 400 of the power storage element 210 facing each other in the arrangement direction thereof are covered by the spacer body 302a. Further, at least a part of the lower end surface 401 of the end plate 400 on the spacer 302 side is covered with the facing portion 320 (more specifically, the first facing portion 321). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 320. Further, at least a part of the bottom surface 211a of the power storage element 210 on the spacer 302 side is covered with the facing portion 320 (more specifically, the second facing portion 322). Therefore, the creepage distance between the power storage element 210 and the end plate 400 is increased as compared with the case where the facing portion 320 is not provided.
  • a gap is formed between the lower end surface 401 of the end plate 400 and the first facing portion 321 of the spacer 302, but this gap may not be provided.
  • the width of the gap in the Z-axis direction is preferably, for example, 1.5 mm or more.
  • the width of the end plate 400 in the Z-axis direction is preferably about the same as the width of the long side surface 211b of the power storage element 210 in the Z-axis direction from the viewpoint of appropriately restraining the power storage element 210.
  • the position of the first facing portion 321 is moved in the Z-axis minus direction instead of moving the position of the end face 401 in the Z-axis plus direction. Is preferable.
  • an opposing portion (opposing portion 324) is also arranged at the upper end portion of the spacer main body 302a.
  • the facing portion 324 is a portion of the upper end portion of the spacer main body 302a that is arranged so as to face the end surface 402 of the end plate 400.
  • the facing portion 324 has a first facing portion 325 and a second facing portion 326.
  • the first facing portion 325 is a portion facing the upper end surface 402 of the end plate 400.
  • the second facing portion 326 is a portion of the power storage element 210 facing the top surface 211d adjacent to the long side surface 211b.
  • the top surface 211d is an example of the second side surface.
  • the facing portion 324 (more specifically, the first facing portion 325). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 324. Further, at least a part of the top surface 211d of the power storage element 210 on the spacer 302 side is covered with the facing portion 324 (more specifically, the second facing portion 326). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 324.
  • a gap is formed between the upper end surface 402 of the end plate 400 and the first facing portion 325 of the spacer 302, but this gap may not be provided.
  • the width of the gap in the Z-axis direction is preferably, for example, 1.5 mm or more.
  • the width of the end plate 400 in the Z-axis direction is preferably about the same as the width of the long side surface 211b of the power storage element 210 in the Z-axis direction.
  • the position of the first facing portion 325 is moved in the Z-axis plus direction instead of moving the position of the end face 402 in the Z-axis minus direction. Is preferable.
  • the power storage device 10 includes a power storage element 210, a conductive end plate 400, and a spacer 302.
  • the spacer 302 is provided at the end of the spacer body 302a arranged between the long side surface 211b of the power storage element 210 and the side surface of the end plate 400, and faces the end surface 401 of the end plate 400. It has an opposing portion 320 and.
  • the end plate 400 arranged for the purpose of restraining the power storage element 210 and the power storage element 210 are mainly electrically insulated by the spacer body 302a of the spacer 302. Since the facing portion 320 of the spacer 302 is arranged to face the end face 401 of the end plate 400, the creepage distance between the end plate 400 and the power storage element 210 at the end of the spacer 302 is increased. As described above, the power storage device 10 according to this aspect can secure the insulation between the power storage elements 210 adjacent to each other and the plate member with a simple configuration. Specifically, since the spacer 302 has the facing portion 320, the creepage distance between the end plate 400 and the power storage element 210 is increased, and as a result, safety is improved.
  • the facing portion 320 can obtain the above-mentioned effect of increasing the creepage distance, it is possible to reduce the thickness of the spacer main body 302a. As a result, the length of the power storage unit 200 in the arrangement direction (Y-axis direction) of the power storage elements 201 can be shortened, which contributes to the miniaturization of the power storage device 10.
  • the spacer 302 according to the present embodiment further has an opposing portion 324 arranged at the upper end portion of the spacer main body 302a. Therefore, even in the vicinity of the upper end portion of the spacer 302, the effect of increasing the creepage distance between the end plate 400 and the power storage element 210 can be obtained by the facing portion 324.
  • the facing portion 320 has a first facing portion 321 facing the end surface 401 of the end plate 400 and a second facing portion 322 of the power storage element 210 facing the bottom surface 211a adjacent to the long side surface 211b.
  • the spacer 302 is arranged not only on the end surface 401 of the end plate 400 but also on the bottom surface 211a of the power storage element 210 located on the side of the end surface 401. Therefore, the creepage distance between the end plate 400 and the power storage element 210 at the lower end of the spacer 302 is further increased, which further improves safety.
  • the facing portion 324 of the spacer 302 also has a first facing portion 325 facing the end surface 402 of the end plate 400 and a second facing portion 326 facing the top surface 211d of the power storage element 210. Therefore, the facing portion 324 can further increase the creepage distance between the end plate 400 and the power storage element 210 at the upper end portion of the spacer 302.
  • the protruding length W2 of the second facing portion 322 from the spacer main body 302a is shorter than the protruding length W1 of the first facing portion 321 from the spacer main body 302a. ..
  • the second facing portion 322 is provided with the first facing portion 321 facing a wide range of the end surface 401 of the end plate 400, and the bottom surface 211a of the power storage element 210 is exposed more. It will be provided. Therefore, as shown in FIG. 6, a wide range of the bottom surface 211a of the power storage element 210 can be directly adhered to the inner bottom surface 113 of the exterior body 100. In the present embodiment, the bottom surface 211a of the power storage element 210 is adhered to the mounting surface portion 113a of the inner bottom surface 113 of the exterior body 100 by the adhesive 90.
  • the creepage distance between the power storage element 210 and the end plate 400 at the lower end of the spacer 302 can be increased, and the power storage element 210 can be firmly fixed. Thereby, the vibration resistance or the impact resistance of the power storage device 10 can be improved.
  • the protruding length W2 of the second facing portion 322 is determined so as to expose a wide range of the bottom surface 211a of the power storage element 210.
  • the thickness T1 of the first facing portion 321 and the thickness T2 of the second facing portion 322 are different.
  • the thicknesses of the first facing portion 321 and the second facing portion 322 are independent of each other according to the sizes of the end plate 400 and the power storage element 210 and the relative positions of the end plate 400 with respect to the power storage element 210.
  • the thickness T1 of the first facing portion 321 is the thickness of the second facing portion 322 with respect to the end surface 401 of the end plate 400 and the bottom surface 211a of the power storage element 210 having substantially the same position in the Z-axis direction. It is formed thinner than T2.
  • the second facing portion 322 can function as a regulating portion that regulates the position of the power storage element 210 by abutting the bottom surface 211a of the power storage element 210.
  • the first facing portion 321 can be separated from the end surface 401 of the end plate 400 to increase the creepage distance between the power storage element 210 and the end plate 400.
  • the spacer 302 since the spacer 302 according to the present embodiment has a high degree of freedom in the shape and size of the facing portion 320, the spacer 302 can be shaped or sized so as to further extend the creepage distance by the facing portion 320.
  • the facing portion 324 at the upper end of the spacer 302 also has the protrusion length or thickness of the first facing portion 325 and the second facing portion 326 from the spacer main body 302a, and the like, and the first facing portion 325. It may be determined independently of the second facing portion 326.
  • the facing portion 320 extends along the end face 401 of the end plate 400.
  • the creepage distance between the end plate 400 having substantially the same size as the long side surface 211b and the power storage element 210 is increased. That is, the effect of increasing the creepage distance can be obtained in a wide range in the X-axis direction, and the safety is further improved.
  • a plate member other than the end plate 400 may be arranged outside the spacer 302 located at the end of the power storage element row 201. It is assumed that a metal and plate-shaped reinforcing member for reinforcing the spacer 302 or the exterior body 100 is arranged outside the spacer 302. In this case, the spacer 302 has the facing portion 320 facing the end surface of the plate-shaped reinforcing member, so that the creepage distance between the power storage element 210 and the reinforcing member is increased.
  • a case containing an electric device such as a control board or a relay may be arranged outside the spacer 302. Even in this case, if the case is made of metal, the spacer 302 has a facing portion 320 facing the end surface (downward surface) of the case, so that the creepage distance between the power storage element 210 and the case Is increased.
  • the bottom surface 211a of the power storage element 210 and the inner bottom surface 113 of the exterior body 100 is not essential to bond the bottom surface 211a of the power storage element 210 and the inner bottom surface 113 of the exterior body 100 with the adhesive 90.
  • the power storage unit 200 can be fixed to a predetermined position inside the exterior body 100 by another member such as an inner lid or a bus bar frame arranged above the power storage unit 200, the bottom surface 211a and the inner bottom surface 113 of the power storage element 210 can be fixed. It is not necessary to bond with.
  • the spacer 302 does not have to have the facing portion 320 in the entire area in the X-axis direction at the lower end portion of the spacer main body 302a.
  • a plurality of facing portions 320 may be provided at the lower end portion of the spacer main body 302a so as to be separated from each other in the X-axis direction. Even in this case, the effect of increasing the creepage distance can be obtained in the existence range of each of the plurality of facing portions 320.
  • the facing portion 320 is arranged at the lower end portion of the spacer main body 302a in the entire range of existence of the plate member such as the end plate 400 in the X-axis direction. That is, since the facing portion 320 is always arranged at a position facing the end surface of the plate member, the certainty of electrical insulation between the power storage element 210 adjacent to each other with the spacer 302 sandwiched between the plate member is improved.
  • the facing portion 320 has the second facing portion 322. That is, the spacer 302 has the facing portion 320 (that is, the first facing portion 321) facing the end surface of the plate member such as the end plate 400 located on the side of the spacer 302, so that the power storage element 210 by the facing portion 320 The effect of increasing the creepage distance between the plate member and the plate member can be obtained.
  • the spacer 300 As the material for forming the spacer 300, a material having electrical insulation other than resin may be adopted.
  • the spacer 300 may be formed of an inorganic material such as mica or glass fiber, or may be formed of a material other than these resins and a material containing both the resin.
  • the spacer 300 may be formed by coating the surface of a metal base material with an insulating resin. That is, the spacer 300 may have an insulating property that does not conduct between a plurality of members in contact with the spacer 300, and the material thereof depends on the required rigidity, durability, heat resistance, flame retardancy, weight, and the like. It may be determined as appropriate.
  • the scope of the present invention also includes a form constructed by arbitrarily combining the above-described embodiments and the components included in the modified examples.
  • the present invention can be applied to a power storage device or the like provided with a power storage element 210 such as a lithium ion secondary battery.
  • Power storage device 40 Reinforcing member 80 Volts 201 Power storage element row 210 Power storage element 211 Container 211a Bottom surface 211b Long side surface 211c Short side surface 211d Top surface 300, 301, 302 Spacer 302a Spacer body 320, 324 Opposing part 321 325 First facing part 322 326 Second facing part 400 End plate 401, 402 End face

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

A power storage device (10) is provided with a power storage element (210), an end plate (400) which is electrically conductive, and a spacer (302). The spacer (302) has a spacer body (302a) disposed between a long lateral surface (211b) of the power storage element (210) and a lateral surface of the end plate (400); and a facing portion (320) that is disposed at an end of the spacer body (302a) and that faces an end surface (401) of the end plate (400).

Description

蓄電装置Power storage device
　本発明は、蓄電素子と蓄電素子の側方に配置されたスペーサとを備える蓄電装置に関する。 The present invention relates to a power storage device including a power storage element and spacers arranged on the sides of the power storage element.
　従来、蓄電素子と蓄電素子の側方に配置されたスペーサとを備える蓄電装置が知られている。例えば、特許文献１には、二次電池の積層方向の両端に配置される一対の端部セルホルダと、二次電池の間に配置される複数の中間セルホルダとを備える電池モジュールが開示されている。この電池モジュールでは、一対の端部セルホルダの外側に、一対のサイドプレートが配置され、これら一対のサイドプレートの幅方向両端部が二次電池の積層方向に延びる一対のサイドフレームによって締結されている。これにより、端部セルホルダ、中間セルホルダおよび二次電池からなる積層体の周囲は、一対のサイドプレートと一対のサイドフレームによって固縛される。 Conventionally, a power storage device including a power storage element and spacers arranged on the side of the power storage element is known. For example, Patent Document 1 discloses a battery module including a pair of end cell holders arranged at both ends in a stacking direction of a secondary battery and a plurality of intermediate cell holders arranged between the secondary batteries. .. In this battery module, a pair of side plates are arranged outside the pair of end cell holders, and both ends of the pair of side plates in the width direction are fastened by a pair of side frames extending in the stacking direction of the secondary batteries. .. As a result, the periphery of the laminate composed of the end cell holder, the intermediate cell holder, and the secondary battery is fixed by the pair of side plates and the pair of side frames.
特開２０１５－１３８７５３号公報Japanese Unexamined Patent Publication No. 2015-138735
　上記従来の電池モジュールでは、二次電池（蓄電素子）の配列方向の端部にセルホルダ（スペーサ）が配置され、その外側に、サイドプレート（板部材）が配置されている。つまり、蓄電素子列の端部において隣り合う蓄電素子と金属製の板部材との間に、樹脂等の絶縁材料で形成されたスペーサが配置される。これにより、互いに隣り合う蓄電素子と板部材との電気的な絶縁が図られる。しかしながら、蓄電素子と板部材とが対向する範囲の全域において、蓄電素子及び板部材のそれぞれは、導電性の材料で構成されているため、スペーサの端部において、蓄電素子と板部材との間の沿面距離が比較的に短い部分が生じる。このことは、蓄電装置の安全性の観点から好ましくない。 In the above-mentioned conventional battery module, a cell holder (spacer) is arranged at the end of the secondary battery (storage element) in the arrangement direction, and a side plate (plate member) is arranged on the outside thereof. That is, a spacer formed of an insulating material such as resin is arranged between the adjacent power storage elements and the metal plate member at the end of the power storage element row. As a result, electrical insulation between the power storage elements adjacent to each other and the plate member is achieved. However, in the entire range where the power storage element and the plate member face each other, since each of the power storage element and the plate member is made of a conductive material, between the power storage element and the plate member at the end of the spacer. There is a part where the creepage distance is relatively short. This is not preferable from the viewpoint of the safety of the power storage device.
　本発明は、本願発明者が上記課題に新たに着目することによってなされたものであり、簡易な構成で安全性が向上された蓄電装置を提供することを目的とする。 The present invention has been made by the inventor of the present application paying new attention to the above problems, and an object of the present invention is to provide a power storage device having a simple configuration and improved safety.
　本発明の一態様に係る蓄電装置は、蓄電素子と、導電性を有する板部材と、スペーサとを備え、前記スペーサは、前記蓄電素子の第一側面と、前記板部材の側面との間に配置されたスペーサ本体と、前記スペーサ本体の端部において、前記板部材の端面に対向して配置された対向部と、を有する。 The power storage device according to one aspect of the present invention includes a power storage element, a conductive plate member, and a spacer, and the spacer is provided between a first side surface of the power storage element and a side surface of the plate member. It has an arranged spacer main body and an opposing portion arranged at an end portion of the spacer main body so as to face the end surface of the plate member.
　本発明における蓄電装置によれば、簡易な構成で安全性を向上させることができる。 According to the power storage device of the present invention, safety can be improved with a simple configuration.
図１は、実施の形態に係る蓄電装置の外観を示す斜視図である。FIG. 1 is a perspective view showing the appearance of the power storage device according to the embodiment. 図２は、実施の形態に係る蓄電装置の分解斜視図である。FIG. 2 is an exploded perspective view of the power storage device according to the embodiment. 図３は、実施の形態に係る蓄電ユニットの分解斜視図である。FIG. 3 is an exploded perspective view of the power storage unit according to the embodiment. 図４は、実施の形態に係る外装体の内部構成の一部を示す切断図である。FIG. 4 is a cut view showing a part of the internal configuration of the exterior body according to the embodiment. 図５Ａは、実施の形態に係るスペーサの外観を示す第１の斜視図である。FIG. 5A is a first perspective view showing the appearance of the spacer according to the embodiment. 図５Ｂは、実施の形態に係るスペーサの外観を示す第２の斜視図である。FIG. 5B is a second perspective view showing the appearance of the spacer according to the embodiment. 図６は、実施の形態に係るスペーサの下端部の対向部及びその周辺の断面図である。FIG. 6 is a cross-sectional view of the facing portion of the lower end portion of the spacer according to the embodiment and the periphery thereof. 図７は、図６に示す対向部の拡大断面図である。FIG. 7 is an enlarged cross-sectional view of the facing portion shown in FIG. 図８は、実施の形態に係るスペーサの上端部の対向部の拡大断面図である。FIG. 8 is an enlarged cross-sectional view of the facing portion of the upper end portion of the spacer according to the embodiment.
　本発明の一態様に係る蓄電装置は、蓄電素子と、導電性を有する板部材と、スペーサとを備え、前記スペーサは、前記蓄電素子の第一側面と、前記板部材の側面との間に配置されたスペーサ本体と、前記スペーサ本体の端部において、前記板部材の端面に対向して配置された対向部と、を有する。 The power storage device according to one aspect of the present invention includes a power storage element, a conductive plate member, and a spacer, and the spacer is provided between a first side surface of the power storage element and a side surface of the plate member. It has an arranged spacer main body and an opposing portion arranged at an end portion of the spacer main body so as to face the end surface of the plate member.
　この構成によれば、蓄電素子の拘束または保持等を目的として配置された板部材と、蓄電素子とが、主としてスペーサのスペーサ本体によって電気的に絶縁される。板部材の端面に対向してスペーサの対向部が配置されるため、スペーサの端部における、板部材と蓄電素子との間の沿面距離が増加される。このように、本態様に係る蓄電装置は、簡易な構成で、互いに隣り合う蓄電素子と板部材との間の絶縁を確保できる。具体的には、スペーサが対向部を有することで、板部材と蓄電素子との間の沿面距離が増加し、その結果、蓄電装置の安全性が向上される。 According to this configuration, the plate member arranged for the purpose of restraining or holding the power storage element and the power storage element are mainly electrically insulated by the spacer body of the spacer. Since the facing portion of the spacer is arranged to face the end face of the plate member, the creepage distance between the plate member and the power storage element at the end of the spacer is increased. As described above, the power storage device according to this aspect can secure the insulation between the power storage elements adjacent to each other and the plate member with a simple configuration. Specifically, since the spacer has the facing portion, the creepage distance between the plate member and the power storage element is increased, and as a result, the safety of the power storage device is improved.
　前記対向部は、前記板部材の端面に対向する第一対向部と、前記蓄電素子の、前記第一側面に隣接する第二側面に対向する第二対向部とを有する、としてもよい。 The facing portion may have a first facing portion facing the end surface of the plate member and a second facing portion of the power storage element facing the second side surface adjacent to the first side surface.
　この構成によれば、スペーサは、板部材の端面だけでなく、当該端面の側方に位置する、蓄電素子の第二側面にも対向して配置される。従って、スペーサの端部における、板部材と蓄電素子との間の沿面距離がさらに増加され、これにより、安全性の更なる向上が図られる。 According to this configuration, the spacer is arranged not only on the end surface of the plate member but also on the second side surface of the power storage element located on the side of the end surface. Therefore, the creepage distance between the plate member and the power storage element at the end of the spacer is further increased, which further improves safety.
　前記第二対向部の、前記スペーサ本体からの突出長さは、前記第一対向部の、前記スペーサ本体からの突出長さよりも短い、としてもよい。 The protruding length of the second facing portion from the spacer main body may be shorter than the protruding length of the first facing portion from the spacer main body.
　この構成によれば、板部材の端面の広い範囲に対向して第一対向部を設けることができ、かつ、蓄電素子の第二側面をより多く露出した状態で、第二対向部を設けることができる。この場合、例えば、蓄電素子の底面である第二側面の広い範囲を、外装体の内底面などの所定の固定面に直接的に接着できる。つまり、スペーサ下端部における蓄電素子と板部材との間の沿面距離を増加させ、かつ、蓄電素子を強固に固定することで、蓄電装置の耐振動性または耐衝撃性を向上させることができる。 According to this configuration, the first facing portion can be provided facing a wide range of the end faces of the plate members, and the second facing portion is provided with the second side surface of the power storage element exposed more. Can be done. In this case, for example, a wide range of the second side surface, which is the bottom surface of the power storage element, can be directly adhered to a predetermined fixed surface such as the inner bottom surface of the exterior body. That is, the vibration resistance or impact resistance of the power storage device can be improved by increasing the creepage distance between the power storage element and the plate member at the lower end of the spacer and firmly fixing the power storage element.
　前記第一対向部の厚みと、前記第二対向部の厚みとは異なる、としてもよい。 The thickness of the first facing portion may be different from the thickness of the second facing portion.
　この構成によれば、板部材及び蓄電素子のサイズ、並びに、板部材の、蓄電素子に対する相対位置に応じて、第一対向部及び第二対向部の厚みを互いに独立して決定できる。すなわち、対向部の形状及びサイズの自由度が高いため、対向部の形状及びサイズを、対向部による沿面距離をさらに延ばすための形状またはサイズにできる。 According to this configuration, the thicknesses of the first facing portion and the second facing portion can be independently determined according to the sizes of the plate member and the power storage element and the relative positions of the plate members with respect to the power storage element. That is, since the degree of freedom in the shape and size of the facing portion is high, the shape and size of the facing portion can be made into a shape or size for further extending the creepage distance by the facing portion.
　前記対向部は、前記板部材の前記端面に沿って延在する、としてもよい。 The facing portion may extend along the end face of the plate member.
　この構成によれば、スペーサが蓄電素子の長側面に沿って配置された場合において、その長側面と略同一の大きさの板部材と、蓄電素子との間の沿面距離（スペーサ端部における沿面距離）が増加される。つまり、広い範囲で沿面距離の増加効果を得ることができ、その結果、蓄電装置の安全性がさらに向上される。 According to this configuration, when the spacer is arranged along the long side surface of the power storage element, the creepage distance between the plate member having substantially the same size as the long side surface and the power storage element (the creepage at the spacer end). Distance) is increased. That is, the effect of increasing the creepage distance can be obtained in a wide range, and as a result, the safety of the power storage device is further improved.
　以下、図面を参照しながら、本発明の実施の形態（その変形例も含む）に係る蓄電装置について説明する。以下で説明する実施の形態は、いずれも包括的または具体的な例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、製造工程、製造工程の順序等は、一例であり、本発明を限定する主旨ではない。各図において、寸法等は厳密に図示したものではない。 Hereinafter, the power storage device according to the embodiment of the present invention (including a modification thereof) will be described with reference to the drawings. Each of the embodiments described below provides a comprehensive or specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing processes, order of manufacturing processes, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. In each figure, the dimensions and the like are not strictly illustrated.
　以下の説明及び図面中において、１つの蓄電素子における一対（正極側及び負極側）の電極端子の並び方向、蓄電素子の容器の短側面の対向方向、または、一対のサイドプレートの並び方向を、Ｘ軸方向と定義する。複数の蓄電素子の配列方向、蓄電素子の容器の長側面の対向方向、または、一対のエンドプレートの並び方向を、Ｙ軸方向と定義する。蓄電装置の外装体本体と蓋体との並び方向、蓄電素子の容器本体と蓋部との並び方向、蓄電素子とバスバーとの並び方向、または、上下方向を、Ｚ軸方向と定義する。これらＸ軸方向、Ｙ軸方向及びＺ軸方向は、互いに交差（本実施の形態では直交）する方向である。使用態様によってはＺ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Ｚ軸方向を上下方向として説明する。 In the following description and drawings, the alignment direction of the pair of (positive electrode side and negative electrode side) electrode terminals in one storage element, the opposite direction of the short side surface of the container of the storage element, or the arrangement direction of the pair of side plates. Defined as the X-axis direction. The arrangement direction of the plurality of power storage elements, the opposite direction of the long side surfaces of the container of the power storage elements, or the arrangement direction of the pair of end plates is defined as the Y-axis direction. The alignment direction of the outer body body and the lid of the power storage device, the arrangement direction of the container body and the lid of the power storage element, the arrangement direction of the power storage element and the bus bar, or the vertical direction is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions are directions that intersect each other (orthogonally in the present embodiment). Depending on the usage mode, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described below as the vertical direction.
　以下の説明において、例えば、Ｘ軸プラス方向とは、Ｘ軸の矢印方向を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対方向を示す。Ｙ軸方向及びＺ軸方向についても同様である。さらに、平行及び直交などの、相対的な方向または姿勢を示す表現は、厳密には、その方向または姿勢ではない場合も含む。例えば、２つの方向が直交している、とは、当該２つの方向が完全に直交していることを意味するだけでなく、実質的に直交していること、すなわち、例えば数％程度の差異を含むことも意味する。 In the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the direction opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. Further, expressions indicating relative directions or postures such as parallel and orthogonal include cases where they are not strictly the directions or postures. For example, the fact that two directions are orthogonal not only means that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, a difference of, for example, about several percent. It also means to include.
　（実施の形態）
　［１．蓄電装置の全般的な説明］
　まず、本実施の形態に係る蓄電装置１０の全般的な説明を行う。図１は、実施の形態に係る蓄電装置１０の外観を示す斜視図である。図２は、実施の形態に係る蓄電装置１０の分解斜視図である。図３は、実施の形態に係る蓄電ユニット２００の分解斜視図である。 (Embodiment)
[1. General description of power storage device]
First, a general description of the power storage device 10 according to the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of the power storage device 10 according to the embodiment. FIG. 2 is an exploded perspective view of the power storage device 10 according to the embodiment. FIG. 3 is an exploded perspective view of the power storage unit 200 according to the embodiment.
　蓄電装置１０は、外部からの電気を充電し、また外部へ電気を放電できる装置であり、本実施の形態では、略直方体形状を有している。蓄電装置１０は、電力貯蔵用途または電源用途等に使用される電池モジュール（組電池）である。具体的には、蓄電装置１０は、自動車、自動二輪車、ウォータークラフト、船舶、スノーモービル、農業機械、建設機械、または、電気鉄道用の鉄道車両等の移動体の駆動用またはエンジン始動用等のバッテリ等として用いられる。上記の自動車としては、電気自動車（ＥＶ）、ハイブリッド電気自動車（ＨＥＶ）、プラグインハイブリッド電気自動車（ＰＨＥＶ）及びガソリン自動車が例示される。上記の電気鉄道用の鉄道車両としては、電車、モノレール及びリニアモーターカーが例示される。蓄電装置１０は、家庭用または発電機用等に使用される定置用のバッテリ等としても用いることができる。 The power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. The power storage device 10 is a battery module (assembled battery) used for power storage, power supply, and the like. Specifically, the power storage device 10 is used for driving a moving body such as an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railroad vehicle for an electric railway, or for starting an engine. Used as a battery or the like. Examples of the above-mentioned automobiles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and gasoline vehicles. Examples of the railway vehicle for the electric railway include a train, a monorail, and a linear motor car. The power storage device 10 can also be used as a stationary battery or the like used for home use, a generator, or the like.
　図１に示すように、蓄電装置１０は、外装体１００を備えている。図２及び図３に示すように、外装体１００の内方には、複数の蓄電素子２１０からなる蓄電素子列２０１を有する蓄電ユニット２００が配置されている。蓄電装置１０は、上記の構成要素の他、バスバーが載置されるバスバーフレーム、蓄電素子２１０の充電状態及び放電状態を監視するための回路基板、ヒューズ、リレー及びコネクタ等の電気機器、並びに、蓄電素子２１０から排出されるガスを外装体１００の外方へ排気するための排気部等を備えていてもよい。 As shown in FIG. 1, the power storage device 10 includes an exterior body 100. As shown in FIGS. 2 and 3, a power storage unit 200 having a power storage element row 201 composed of a plurality of power storage elements 210 is arranged inside the exterior body 100. In addition to the above components, the power storage device 10 includes a bus bar frame on which a bus bar is mounted, a circuit board for monitoring the charge state and discharge state of the power storage element 210, electric devices such as fuses, relays and connectors, and an electric device. An exhaust unit or the like for exhausting the gas discharged from the power storage element 210 to the outside of the exterior body 100 may be provided.
　蓄電ユニット２００は、複数の蓄電素子２１０が配列された蓄電素子列２０１、複数のスペーサ３００（３０１、３０２）、一対のエンドプレート４００、及び、一対のサイドプレート５００を有する。複数の蓄電素子２１０は、図示しない複数のバスバーにより例えば直列に接続されている。 The power storage unit 200 has a power storage element row 201 in which a plurality of power storage elements 210 are arranged, a plurality of spacers 300 (301, 302), a pair of end plates 400, and a pair of side plates 500. The plurality of power storage elements 210 are connected in series, for example, by a plurality of bus bars (not shown).
　外装体１００は、蓄電装置１０の外装体を構成する箱形（略直方体形状）の容器（モジュールケース）である。つまり、外装体１００は、蓄電ユニット２００等を所定の位置で固定し、衝撃等から保護する。外装体１００は、例えば、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタラート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ＡＢＳ樹脂、若しくは、それらの複合材料等の絶縁部材、または、絶縁塗装をした金属等により形成されている。外装体１００は、これにより、蓄電素子２１０等が外部の金属部材等に接触することを回避する。蓄電素子２１０等の電気的絶縁性が保たれる構成であれば、外装体１００は、金属等の導電部材で形成されていてもよい。 The exterior body 100 is a box-shaped (substantially rectangular parallelepiped) container (module case) that constitutes the exterior body of the power storage device 10. That is, the exterior body 100 fixes the power storage unit 200 or the like at a predetermined position and protects it from impact or the like. The exterior body 100 includes, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (including modified PPE). PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene / perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), ABS resin, or , It is formed of an insulating member such as a composite material thereof, or an insulating coated metal or the like. As a result, the exterior body 100 prevents the power storage element 210 or the like from coming into contact with an external metal member or the like. The exterior body 100 may be formed of a conductive member such as metal as long as the electrical insulation of the power storage element 210 or the like is maintained.
　外装体１００は、外装体１００の本体を構成する外装体本体１１０と、外装体１００の蓋体を構成する外装体蓋体１２０と、を有している。外装体本体１１０は、開口が形成された有底矩形筒状のハウジング（筐体）であり、蓄電素子２１０等を収容する。外装体蓋体１２０は、外装体本体１１０の開口を閉塞する扁平な矩形状の部材である。外装体蓋体１２０は、接着剤、ヒートシールまたは超音波溶着等によって、外装体本体１１０と接合される。外装体蓋体１２０には、正極外部端子１２１と負極外部端子１２２とが設けられている。正極外部端子１２１は、蓄電ユニット２００の総プラス端子である電極端子２２０と電気的に接続される。負極外部端子１２２は、蓄電ユニット２００の総マイナス端子である電極端子２２０と電気的に接続される。蓄電装置１０は、この正極外部端子１２１と負極外部端子１２２とを介して、外部からの電気を充電し、また外部へ電気を放電する。 The exterior body 100 has an exterior body body 110 that constitutes the main body of the exterior body 100, and an exterior body lid body 120 that constitutes the lid body of the exterior body 100. The exterior body body 110 is a bottomed rectangular cylindrical housing (housing) having an opening, and accommodates a power storage element 210 and the like. The exterior body lid 120 is a flat rectangular member that closes the opening of the exterior body body 110. The exterior body lid 120 is joined to the exterior body 110 by an adhesive, heat seal, ultrasonic welding, or the like. The exterior body lid 120 is provided with a positive electrode external terminal 121 and a negative electrode external terminal 122. The positive electrode external terminal 121 is electrically connected to the electrode terminal 220, which is the total positive terminal of the power storage unit 200. The negative electrode external terminal 122 is electrically connected to the electrode terminal 220, which is the total negative terminal of the power storage unit 200. The power storage device 10 charges electricity from the outside and discharges electricity to the outside via the positive electrode external terminal 121 and the negative electrode external terminal 122.
　蓄電素子２１０は、電気を充電し、電気を放電することのできる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池等の非水電解質二次電池である。蓄電素子２１０は、扁平な直方体形状（角形）を有しており、本実施の形態では、４個の蓄電素子２１０がＹ軸方向に並んで配列されることで蓄電素子列２０１が形成されている。蓄電素子２１０の大きさ、形状、及び、配列される蓄電素子２１０の個数は限定されず、例えば１つの蓄電素子２１０しか配置されていなくてもよい。蓄電素子２１０は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子２１０は、二次電池ではなく、使用者が充電をしなくても蓄えられている電気を使用できる一次電池であってもよい。 The power storage element 210 is a secondary battery (cell battery) capable of charging electricity and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 210 has a flat rectangular parallelepiped shape (square shape), and in the present embodiment, the power storage element row 201 is formed by arranging the four power storage elements 210 side by side in the Y-axis direction. There is. The size and shape of the power storage element 210 and the number of power storage elements 210 arranged are not limited, and for example, only one power storage element 210 may be arranged. The power storage element 210 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. The power storage element 210 may be a primary battery that can use the stored electricity without being charged by the user, instead of the secondary battery.
　本実施の形態に係る蓄電素子２１０は、容器２１１と、一対（正極側及び負極側）の電極端子２２０と、を備えている（図３参照）。容器２１１の内方には、電極体、一対の集電体、及び、電解液（非水電解質）等が収容されており、容器２１１と電極端子２２０及び集電体との間にはガスケットが配置されているが、これらの図示は省略する。当該電解液としては、蓄電素子２１０の性能を損なうものでなければその種類に特に制限はなく、様々なものを選択できる。蓄電素子２１０は、上記構成の他、集電体の側方等に配置されるスペーサ、及び、容器２１１の外面を覆う絶縁シート等を備えていてもよい。 The power storage element 210 according to the present embodiment includes a container 211 and a pair (positive electrode side and negative electrode side) of electrode terminals 220 (see FIG. 3). An electrode body, a pair of current collectors, an electrolytic solution (non-aqueous electrolyte), and the like are housed inside the container 211, and a gasket is provided between the container 211 and the electrode terminal 220 and the current collector. Although they are arranged, these illustrations are omitted. The type of the electrolytic solution is not particularly limited as long as it does not impair the performance of the power storage element 210, and various types can be selected. In addition to the above configuration, the power storage element 210 may include a spacer arranged on the side of the current collector, an insulating sheet covering the outer surface of the container 211, and the like.
　容器２１１は、開口が形成された容器本体と、容器本体の開口を閉塞し、かつ容器２１１の天面２１１ｄを形成する蓋部とを有する直方体形状（角形）の容器である。容器２１１は、例えば、ステンレス鋼、アルミニウム、アルミニウム合金、鉄、またはメッキ鋼板等の金属等で形成されている。本実施の形態では、図３に示すように、容器２１１は、長側面２１１ｂがＹ軸方向に向き、短側面２１１ｃがＸ軸方向に向く姿勢、つまり、一対の長側面２１１ｂがＹ軸方向で対向し、一対の短側面２１１ｃがＸ軸方向で対向する姿勢で配置されている。容器２１１の天面２１１ｄには、容器２１１内方の圧力が上昇した場合に当該圧力を開放するガス排出弁２３０が設けられている（図３参照）。つまり、容器２１１において、ガス排出弁２３０は、容器２１１のＺ軸マイナス方向側の面である底面２１１ａと対向する天面２１１ｄ（蓋部の上面）に配置されている。 The container 211 is a rectangular parallelepiped (square) container having a container body having an opening and a lid portion that closes the opening of the container body and forms the top surface 211d of the container 211. The container 211 is made of, for example, stainless steel, aluminum, an aluminum alloy, iron, a metal such as a plated steel plate, or the like. In the present embodiment, as shown in FIG. 3, the container 211 has a posture in which the long side surface 211b faces the Y-axis direction and the short side surface 211c faces the X-axis direction, that is, the pair of long side surfaces 211b faces the Y-axis direction. A pair of short side surfaces 211c are arranged so as to face each other and face each other in the X-axis direction. A gas discharge valve 230 that releases the pressure inside the container 211 when the pressure inside the container 211 rises is provided on the top surface 211d of the container 211 (see FIG. 3). That is, in the container 211, the gas discharge valve 230 is arranged on the top surface 211d (upper surface of the lid portion) facing the bottom surface 211a, which is the surface of the container 211 on the negative direction side of the Z axis.
　電極端子２２０は、容器２１１のＺ軸プラス方向側の面（蓋部）に配置される蓄電素子２１０の端子（正極端子または負極端子）である。電極端子２２０は、集電体を介して、電極体の正極板または負極板に電気的に接続されている。つまり、一対の電極端子２２０のそれぞれは、電極体に蓄えられている電気を蓄電素子２１０の外部空間に導出し、電極体に電気を蓄えるために蓄電素子２１０の内部空間に電気を導入するための金属製の部材である。電極端子２２０は、アルミニウム、アルミニウム合金、銅、または銅合金等で形成されている。 The electrode terminal 220 is a terminal (positive electrode terminal or negative electrode terminal) of the power storage element 210 arranged on the Z-axis plus direction side surface (cover portion) of the container 211. The electrode terminal 220 is electrically connected to the positive electrode plate or the negative electrode plate of the electrode body via a current collector. That is, each of the pair of electrode terminals 220 leads the electricity stored in the electrode body to the external space of the power storage element 210, and introduces electricity into the internal space of the power storage element 210 in order to store electricity in the electrode body. It is a metal member of. The electrode terminal 220 is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like.
　電極体は、正極板と負極板とセパレータとが積層されて形成された蓄電要素（発電要素）である。正極板は、アルミニウムまたはアルミニウム合金等の金属からなる集電箔である正極基材層上に正極活物質層が形成されたものである。負極板は、銅または銅合金等の金属からなる集電箔である負極基材層上に負極活物質層が形成されたものである。正極活物質層及び負極活物質層に用いられる活物質としては、リチウムイオンを吸蔵放出可能なものであれば、適宜公知の材料を使用できる。電極体は、極板（正極板及び負極板）が巻回されて形成された巻回型の電極体、複数の平板状の極板が積層されて形成された積層型（スタック型）の電極体、または、極板を蛇腹状に折り畳んだ蛇腹型の電極体等、どのような形態の電極体でもよい。 The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is a positive electrode active material layer formed on a positive electrode base material layer which is a current collecting foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of a metal such as copper or a copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, known materials can be appropriately used as long as they can occlude and release lithium ions. The electrode body is a wound electrode body formed by winding electrode plates (positive electrode plate and negative electrode plate), and a laminated type (stack type) electrode formed by laminating a plurality of flat plate-shaped electrode plates. Any form of electrode body such as a body or a bellows-shaped electrode body obtained by folding a electrode plate into a bellows shape may be used.
　集電体は、電極端子２２０と電極体とに電気的に接続される導電性の部材（正極集電体または負極集電体）である。正極集電体は、正極板の正極基材層と同様、アルミニウムまたはアルミニウム合金等で形成され、負極集電体は、負極板の負極基材層と同様、銅または銅合金等で形成されている。 The current collector is a conductive member (positive electrode current collector or negative electrode current collector) that is electrically connected to the electrode terminal 220 and the electrode body. The positive electrode current collector is formed of aluminum or an aluminum alloy or the like like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper or a copper alloy or the like like the negative electrode base material layer of the negative electrode plate. There is.
　スペーサ３００（スペーサ３０１、３０２）は、蓄電素子２１０の側方（Ｙ軸プラス方向またはＹ軸マイナス方向）に配置され、蓄電素子２１０と他の部材とを電気的に絶縁する矩形状かつ板状の部材である。具体的には、スペーサ３０１は、隣り合う２つの蓄電素子２１０の間に配置され、当該２つの蓄電素子２１０の間を電気的に絶縁する部材である。スペーサ３０１は、例えばセル間スペーサと呼ばれる部材である。スペーサ３０２は、端部の蓄電素子２１０とエンドプレート４００との間に配置され、当該端部の蓄電素子２１０とエンドプレート４００との間を電気的に絶縁する部材である。スペーサ３０２は、例えばエンドスペーサと呼ばれる部材である。スペーサ３０１、３０２のそれぞれは、蓄電素子２１０のＸ軸方向両側（短側面２１１ｃの側）も覆うように配置されて、蓄電素子２１０とサイドプレート５００との間も電気的に絶縁する。 The spacers 300 (spacers 301 and 302) are arranged on the side of the power storage element 210 (Y-axis plus direction or Y-axis minus direction), and have a rectangular shape and a plate shape that electrically insulate the power storage element 210 from other members. It is a member of. Specifically, the spacer 301 is a member that is arranged between two adjacent power storage elements 210 and electrically insulates between the two power storage elements 210. The spacer 301 is, for example, a member called an inter-cell spacer. The spacer 302 is a member that is arranged between the power storage element 210 at the end and the end plate 400, and electrically insulates between the power storage element 210 at the end and the end plate 400. The spacer 302 is a member called, for example, an end spacer. Each of the spacers 301 and 302 is arranged so as to cover both sides of the power storage element 210 in the X-axis direction (the side of the short side surface 211c), and electrically insulates between the power storage element 210 and the side plate 500.
　本実施の形態では、４つの蓄電素子２１０に対応して、３つのスペーサ３０１と２つのスペーサ３０２とが配置されている。蓄電素子２１０の個数が４つ以外の場合には、スペーサ３０１の個数も蓄電素子２１０の個数に応じて適宜変更される。スペーサ３００は、例えば、上記の外装体１００に使用可能ないずれかの電気的絶縁性の樹脂材料等で形成されている。本実施の形態において、蓄電素子２１０とエンドプレート４００との間に配置されるスペーサ３０２は、側方に位置するエンドプレート４００の端面に対向する部分を有している。これにより、スペーサ３０２を挟んで隣り合う蓄電素子２１０とエンドプレート４００との間の電気的な絶縁性が向上されている。スペーサ３０２についての詳細は、図４～図８を用いて後述する。 In the present embodiment, three spacers 301 and two spacers 302 are arranged corresponding to the four power storage elements 210. When the number of power storage elements 210 is other than 4, the number of spacers 301 is also appropriately changed according to the number of power storage elements 210. The spacer 300 is made of, for example, any electrically insulating resin material that can be used for the exterior body 100. In the present embodiment, the spacer 302 arranged between the power storage element 210 and the end plate 400 has a portion facing the end surface of the end plate 400 located on the side. As a result, the electrical insulation between the power storage elements 210 and the end plate 400 that are adjacent to each other with the spacer 302 in between is improved. Details of the spacer 302 will be described later with reference to FIGS. 4 to 8.
　エンドプレート４００及びサイドプレート５００は、電素子列２０１における蓄電素子２１０の配列方向（Ｙ軸方向）において、蓄電素子列２０１を外方から圧迫（拘束）する拘束部材である。つまり、一対のエンドプレート４００は、蓄電素子列２０１を当該配列方向の両側から挟み込み、かつ、一対のサイドプレート５００は一対のエンドプレート４００に拘束力を与える。これにより、蓄電素子列２０１に含まれるそれぞれの蓄電素子２１０は、当該配列方向の両側から圧迫（拘束）される。エンドプレート４００は、板部材の一例である。 The end plate 400 and the side plate 500 are restraining members that press (constrain) the power storage element row 201 from the outside in the arrangement direction (Y-axis direction) of the power storage element 210 in the electric element row 201. That is, the pair of end plates 400 sandwich the power storage element row 201 from both sides in the arrangement direction, and the pair of side plates 500 exert a binding force on the pair of end plates 400. As a result, each of the power storage elements 210 included in the power storage element row 201 is compressed (constrained) from both sides in the arrangement direction. The end plate 400 is an example of a plate member.
　本実施の形態では、サイドプレート５００は、Ｚ軸方向に並ぶ複数のナット５００ａによって、エンドプレート４００に接続（接合）されている（図３参照）。具体的には、ナット５００ａは、サイドプレート５００を貫通したエンドプレート４００のネジ部と螺合されて当該ネジ部に締結される。エンドプレート４００及びサイドプレート５００は、鉄、ステンレス鋼、またはアルミニウム合金等の金属で形成されている。 In the present embodiment, the side plate 500 is connected (joined) to the end plate 400 by a plurality of nuts 500a arranged in the Z-axis direction (see FIG. 3). Specifically, the nut 500a is screwed into the threaded portion of the end plate 400 penetrating the side plate 500 and fastened to the threaded portion. The end plate 400 and the side plate 500 are made of a metal such as iron, stainless steel, or an aluminum alloy.
　本実施の形態では、外装体１００の外側に補強部材４０が配置されている。補強部材４０は、鉄等の強度の高い材料で構成された部材であり、蓄電装置１０の耐衝撃性等を高める機能を有している。本実施の形態では、図２に示すように、外装体１００の底壁１１５に沿って補強部材４０が配置されており、４つのボルト８０により、補強部材４０が外装体１００に固定されている。 In the present embodiment, the reinforcing member 40 is arranged on the outside of the exterior body 100. The reinforcing member 40 is a member made of a high-strength material such as iron, and has a function of enhancing the impact resistance of the power storage device 10. In the present embodiment, as shown in FIG. 2, the reinforcing member 40 is arranged along the bottom wall 115 of the exterior body 100, and the reinforcing member 40 is fixed to the exterior body 100 by four bolts 80. ..
　［２．スペーサ及びその周辺の構造について］
　次に、スペーサ３０２及びその周辺の構造について、図４～図８を参照しながら説明する。図４は、実施の形態に係る外装体１００の内部構成の一部を示す切断図である。図４では、図２のＩＶ－ＩＶ線に平行なＹＺ平面で外装体本体１１０の一部を切り取り、かつ、外装体本体１１０の底壁１１５から蓄電ユニット２００を浮かせた状態の外装体本体１１０が図示されている。図５Ａは、実施の形態に係るスペーサ３０２の外観を示す第１の斜視図であり、図５Ｂは、実施の形態に係るスペーサ３０２の外観を示す第２の斜視図である。図６は、実施の形態に係るスペーサ３０２の下端部の対向部３２０及びその周辺の断面図である。図６では、図４のＶＩ－ＶＩ線を通るＹＺ平面における蓄電装置１０の断面の一部が図示されている。図７は、図６に示す対向部３２０の拡大断面図である。図８は、実施の形態に係るスペーサ３０２の上端部の対向部３２４の拡大断面図である。図８では、図５ＡのＶＩＩＩ－ＶＩＩＩ線を通るＹＺ平面における対向部３２４の断面が、同平面におけるエンドプレート４００の断面とともに図示されている。 [2. Spacer and its surrounding structure]
Next, the structure of the spacer 302 and its surroundings will be described with reference to FIGS. 4 to 8. FIG. 4 is a cut view showing a part of the internal configuration of the exterior body 100 according to the embodiment. In FIG. 4, a part of the exterior body 110 is cut out on a YZ plane parallel to the IV-IV line of FIG. 2, and the power storage unit 200 is floated from the bottom wall 115 of the exterior body 110. Is illustrated. FIG. 5A is a first perspective view showing the appearance of the spacer 302 according to the embodiment, and FIG. 5B is a second perspective view showing the appearance of the spacer 302 according to the embodiment. FIG. 6 is a cross-sectional view of the facing portion 320 at the lower end of the spacer 302 and its periphery according to the embodiment. FIG. 6 shows a part of a cross section of the power storage device 10 in the YZ plane passing through the VI-VI line of FIG. FIG. 7 is an enlarged cross-sectional view of the facing portion 320 shown in FIG. FIG. 8 is an enlarged cross-sectional view of the facing portion 324 of the upper end portion of the spacer 302 according to the embodiment. In FIG. 8, the cross section of the facing portion 324 in the YZ plane passing through the VIII-VIII line of FIG. 5A is shown together with the cross section of the end plate 400 in the same plane.
　図４に示すように、蓄電ユニット２００は、外装体１００の内部において、内底面１１３に載置される。内底面１１３は、外装体１００（外装体本体１１０）の底壁１１５の内面（外装体１００の内部側の面）である。内底面１１３は、具体的には、蓄電素子２１０が載置される載置面部１１３ａと、ボルト８０が貫通する貫通孔が形成された固定面部１１３ｂとを有する。ボルト８０は、外装体１００の底壁１１５の貫通孔を貫通し、補強部材４０のネジ孔に螺合することで、補強部材４０を外装体１００に対して固定する。 As shown in FIG. 4, the power storage unit 200 is placed on the inner bottom surface 113 inside the exterior body 100. The inner bottom surface 113 is an inner surface (a surface on the inner side of the exterior body 100) of the bottom wall 115 of the exterior body 100 (exterior body main body 110). Specifically, the inner bottom surface 113 has a mounting surface portion 113a on which the power storage element 210 is mounted, and a fixed surface portion 113b in which a through hole through which the bolt 80 penetrates is formed. The bolt 80 penetrates the through hole of the bottom wall 115 of the exterior body 100 and is screwed into the screw hole of the reinforcing member 40 to fix the reinforcing member 40 to the exterior body 100.
　本実施の形態において、蓄電ユニット２００が有する蓄電素子列２０１の、配列方向における端部の蓄電素子２１０の外側にはスペーサ３０２が配置されている。スペーサ３０２は、蓄電素子列２０１の端部において、蓄電素子２１０とエンドプレート４００とを電気的に絶縁する役割を担っている。スペーサ３０２は、図５Ａ～図７に示すように、スペーサ本体３０２ａと対向部３２０とを有している。スペーサ本体３０２ａは、蓄電素子２１０の長側面２１１ｂと、エンドプレート４００の側面（具体的には、厚み方向（Ｙ軸方向）の側面）との間に配置される部分である。長側面２１１ｂは、第一側面の一例である。 In the present embodiment, the spacer 302 is arranged outside the power storage element 210 at the end in the arrangement direction of the power storage element row 201 of the power storage unit 200. The spacer 302 plays a role of electrically insulating the power storage element 210 and the end plate 400 at the end of the power storage element row 201. As shown in FIGS. 5A to 7, the spacer 302 has a spacer main body 302a and an opposing portion 320. The spacer body 302a is a portion arranged between the long side surface 211b of the power storage element 210 and the side surface of the end plate 400 (specifically, the side surface in the thickness direction (Y-axis direction)). The long side surface 211b is an example of the first side surface.
　対向部３２０は、スペーサ本体３０２ａの端部に設けられた、エンドプレート４００の端面４０１に対向する部分である。具体的には、対向部３２０は、スペーサ本体３０２ａの下端部に配置されており、第一対向部３２１と第二対向部３２２とを有している。第一対向部３２１は、図６及び図７に示すように、エンドプレート４００の下側の端面４０１に対向する部分である。第二対向部３２２は、図６及び図７に示すように、蓄電素子２１０の、長側面２１１ｂに隣接する底面２１１ａに対向する部分である。底面２１１ａは、第二側面の一例である。 The facing portion 320 is a portion provided at the end of the spacer main body 302a and facing the end surface 401 of the end plate 400. Specifically, the facing portion 320 is arranged at the lower end portion of the spacer main body 302a, and has a first facing portion 321 and a second facing portion 322. As shown in FIGS. 6 and 7, the first facing portion 321 is a portion facing the lower end surface 401 of the end plate 400. As shown in FIGS. 6 and 7, the second facing portion 322 is a portion of the power storage element 210 facing the bottom surface 211a adjacent to the long side surface 211b. The bottom surface 211a is an example of the second side surface.
　このように、本実施の形態では、蓄電素子２１０の容器２１１及びエンドプレート４００の、これらの並び方向における互いに対向する範囲は、スペーサ本体３０２ａによって覆われる。さらに、エンドプレート４００の下側の端面４０１の、スペーサ３０２側の少なくとも一部は、対向部３２０（より具体的には第一対向部３２１）に覆われる。従って、スペーサ３０２が対向部３２０を有しない場合と比較すると、蓄電素子２１０とエンドプレート４００との間の沿面距離は増加する。さらに、蓄電素子２１０の底面２１１ａの、スペーサ３０２側の少なくとも一部は、対向部３２０（より具体的には第二対向部３２２）に覆われる。従って、対向部３２０がないとした場合と比較すると、蓄電素子２１０とエンドプレート４００との間の沿面距離は増加する。 As described above, in the present embodiment, the ranges of the container 211 and the end plate 400 of the power storage element 210 facing each other in the arrangement direction thereof are covered by the spacer body 302a. Further, at least a part of the lower end surface 401 of the end plate 400 on the spacer 302 side is covered with the facing portion 320 (more specifically, the first facing portion 321). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 320. Further, at least a part of the bottom surface 211a of the power storage element 210 on the spacer 302 side is covered with the facing portion 320 (more specifically, the second facing portion 322). Therefore, the creepage distance between the power storage element 210 and the end plate 400 is increased as compared with the case where the facing portion 320 is not provided.
　図７では、エンドプレート４００の下側の端面４０１と、スペーサ３０２の第一対向部３２１との間に隙間が形成されているが、この隙間はなくてもよい。しかし、端面４０１と第一対向部３２１との間に隙間がある場合、当該隙間がない場合よりも、蓄電素子２１０とエンドプレート４００との間の沿面距離が増加する点で有利である。当該隙間のＺ軸方向の幅としては、例えば１．５ｍｍ以上であることが好ましい。エンドプレート４００のＺ軸方向の幅は、蓄電素子２１０を適切に拘束するという観点から、蓄電素子２１０の長側面２１１ｂのＺ軸方向の幅と同程度であることが好ましい。従って、端面４０１と第一対向部３２１との間に隙間を設ける場合、端面４０１の位置をＺ軸プラス方向に移動させるのではなく、第一対向部３２１の位置をＺ軸マイナス方向に移動させることが好ましい。 In FIG. 7, a gap is formed between the lower end surface 401 of the end plate 400 and the first facing portion 321 of the spacer 302, but this gap may not be provided. However, when there is a gap between the end face 401 and the first facing portion 321, it is advantageous in that the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where there is no such gap. The width of the gap in the Z-axis direction is preferably, for example, 1.5 mm or more. The width of the end plate 400 in the Z-axis direction is preferably about the same as the width of the long side surface 211b of the power storage element 210 in the Z-axis direction from the viewpoint of appropriately restraining the power storage element 210. Therefore, when a gap is provided between the end face 401 and the first facing portion 321, the position of the first facing portion 321 is moved in the Z-axis minus direction instead of moving the position of the end face 401 in the Z-axis plus direction. Is preferable.
　本実施の形態では、図５Ａ、図５Ｂ、及び図８に示すように、スペーサ本体３０２ａの上端部にも対向部（対向部３２４）が配置されている。対向部３２４は、スペーサ本体３０２ａの上端部において、エンドプレート４００の端面４０２に対向して配置される部分である。具体的には、対向部３２４は、図８に示すように、第一対向部３２５と第二対向部３２６とを有している。第一対向部３２５は、エンドプレート４００の上側の端面４０２に対向する部分である。第二対向部３２６は、蓄電素子２１０の、長側面２１１ｂに隣接する天面２１１ｄに対向する部分である。天面２１１ｄは、第二側面の一例である。 In the present embodiment, as shown in FIGS. 5A, 5B, and 8, an opposing portion (opposing portion 324) is also arranged at the upper end portion of the spacer main body 302a. The facing portion 324 is a portion of the upper end portion of the spacer main body 302a that is arranged so as to face the end surface 402 of the end plate 400. Specifically, as shown in FIG. 8, the facing portion 324 has a first facing portion 325 and a second facing portion 326. The first facing portion 325 is a portion facing the upper end surface 402 of the end plate 400. The second facing portion 326 is a portion of the power storage element 210 facing the top surface 211d adjacent to the long side surface 211b. The top surface 211d is an example of the second side surface.
　このように、本実施の形態では、エンドプレート４００の上側の端面４０２の、スペーサ３０２側の少なくとも一部は、対向部３２４（より具体的には第一対向部３２５）に覆われる。従って、スペーサ３０２が対向部３２４を有しない場合と比較すると、蓄電素子２１０とエンドプレート４００との間の沿面距離は増加する。さらに、蓄電素子２１０の天面２１１ｄの、スペーサ３０２側の少なくとも一部は、対向部３２４（より具体的には第二対向部３２６）に覆われる。従って、スペーサ３０２が対向部３２４を有しない場合と比較すると、蓄電素子２１０とエンドプレート４００との間の沿面距離は増加する。 As described above, in the present embodiment, at least a part of the upper end surface 402 of the end plate 400 on the spacer 302 side is covered with the facing portion 324 (more specifically, the first facing portion 325). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 324. Further, at least a part of the top surface 211d of the power storage element 210 on the spacer 302 side is covered with the facing portion 324 (more specifically, the second facing portion 326). Therefore, the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where the spacer 302 does not have the facing portion 324.
　図８では、エンドプレート４００の上側の端面４０２と、スペーサ３０２の第一対向部３２５との間に隙間が形成されているが、この隙間はなくてもよい。しかし、端面４０２と第一対向部３２５との間に隙間がある場合、当該隙間がない場合よりも、蓄電素子２１０とエンドプレート４００との間の沿面距離が増加する点で有利である。当該隙間のＺ軸方向の幅としては、例えば１．５ｍｍ以上であることが好ましい。エンドプレート４００のＺ軸方向の幅は、上述のように、蓄電素子２１０の長側面２１１ｂのＺ軸方向の幅と同程度であることが好ましい。従って、端面４０２と第一対向部３２５との間に隙間を設ける場合、端面４０２の位置をＺ軸マイナス方向に移動させるのではなく、第一対向部３２５の位置をＺ軸プラス方向に移動させることが好ましい。 In FIG. 8, a gap is formed between the upper end surface 402 of the end plate 400 and the first facing portion 325 of the spacer 302, but this gap may not be provided. However, when there is a gap between the end face 402 and the first facing portion 325, it is advantageous in that the creepage distance between the power storage element 210 and the end plate 400 increases as compared with the case where there is no such gap. The width of the gap in the Z-axis direction is preferably, for example, 1.5 mm or more. As described above, the width of the end plate 400 in the Z-axis direction is preferably about the same as the width of the long side surface 211b of the power storage element 210 in the Z-axis direction. Therefore, when a gap is provided between the end face 402 and the first facing portion 325, the position of the first facing portion 325 is moved in the Z-axis plus direction instead of moving the position of the end face 402 in the Z-axis minus direction. Is preferable.
　［３．効果の説明］
　以上のように、本発明の実施の形態に係る蓄電装置１０は、蓄電素子２１０と、導電性を有するエンドプレート４００と、スペーサ３０２とを備える。スペーサ３０２は、蓄電素子２１０の長側面２１１ｂと、エンドプレート４００の側面との間に配置されたスペーサ本体３０２ａと、スペーサ本体３０２ａの端部に設けられて、エンドプレート４００の端面４０１に対向する対向部３２０と、を有する。 [3. Explanation of effect]
As described above, the power storage device 10 according to the embodiment of the present invention includes a power storage element 210, a conductive end plate 400, and a spacer 302. The spacer 302 is provided at the end of the spacer body 302a arranged between the long side surface 211b of the power storage element 210 and the side surface of the end plate 400, and faces the end surface 401 of the end plate 400. It has an opposing portion 320 and.
　この構成によれば、蓄電素子２１０の拘束を目的として配置されたエンドプレート４００と、蓄電素子２１０とが、主としてスペーサ３０２のスペーサ本体３０２ａによって電気的に絶縁される。エンドプレート４００の端面４０１に対向してスペーサ３０２の対向部３２０が配置されるため、スペーサ３０２の端部における、エンドプレート４００と蓄電素子２１０との間の沿面距離が増加される。このように、本態様に係る蓄電装置１０は、簡易な構成で、互いに隣り合う蓄電素子２１０と板部材との間の絶縁を確保できる。具体的には、スペーサ３０２が対向部３２０を有することで、エンドプレート４００と蓄電素子２１０との間の沿面距離が増加し、その結果、安全性が向上される。さらに、対向部３２０により、上記の沿面距離の増加効果を得ることができるため、スペーサ本体３０２ａの厚みを薄くすることも可能である。これにより、蓄電ユニット２００の、蓄電素子２０１の配列方向（Ｙ軸方向）の長さを短くでき、このことは、蓄電装置１０の小型化に寄与する。 According to this configuration, the end plate 400 arranged for the purpose of restraining the power storage element 210 and the power storage element 210 are mainly electrically insulated by the spacer body 302a of the spacer 302. Since the facing portion 320 of the spacer 302 is arranged to face the end face 401 of the end plate 400, the creepage distance between the end plate 400 and the power storage element 210 at the end of the spacer 302 is increased. As described above, the power storage device 10 according to this aspect can secure the insulation between the power storage elements 210 adjacent to each other and the plate member with a simple configuration. Specifically, since the spacer 302 has the facing portion 320, the creepage distance between the end plate 400 and the power storage element 210 is increased, and as a result, safety is improved. Further, since the facing portion 320 can obtain the above-mentioned effect of increasing the creepage distance, it is possible to reduce the thickness of the spacer main body 302a. As a result, the length of the power storage unit 200 in the arrangement direction (Y-axis direction) of the power storage elements 201 can be shortened, which contributes to the miniaturization of the power storage device 10.
　上述のように、本実施の形態に係るスペーサ３０２はさらに、スペーサ本体３０２ａの上端部に配置された対向部３２４を有している。従って、スペーサ３０２の上端部付近においても、対向部３２４による、エンドプレート４００と蓄電素子２１０との間の沿面距離の増加効果を得ることができる。 As described above, the spacer 302 according to the present embodiment further has an opposing portion 324 arranged at the upper end portion of the spacer main body 302a. Therefore, even in the vicinity of the upper end portion of the spacer 302, the effect of increasing the creepage distance between the end plate 400 and the power storage element 210 can be obtained by the facing portion 324.
　本実施の形態において、対向部３２０は、エンドプレート４００の端面４０１に対向する第一対向部３２１と、蓄電素子２１０の、長側面２１１ｂに隣接する底面２１１ａに対向する第二対向部３２２とを有する。 In the present embodiment, the facing portion 320 has a first facing portion 321 facing the end surface 401 of the end plate 400 and a second facing portion 322 of the power storage element 210 facing the bottom surface 211a adjacent to the long side surface 211b. Have.
　このように、本実施の形態において、スペーサ３０２は、エンドプレート４００の端面４０１だけでなく、端面４０１の側方に位置する、蓄電素子２１０の底面２１１ａにも対向して配置される。従って、スペーサ３０２の下端部における、エンドプレート４００と蓄電素子２１０との間の沿面距離がさらに増加され、これにより、安全性の更なる向上が図られる。スペーサ３０２が有する対向部３２４も同様に、エンドプレート４００の端面４０２に対向する第一対向部３２５と、蓄電素子２１０の天面２１１ｄに対向する第二対向部３２６とを有している。従って、対向部３２４は、スペーサ３０２の上端部において、エンドプレート４００と蓄電素子２１０との間の沿面距離をさらに増加させることができる。 As described above, in the present embodiment, the spacer 302 is arranged not only on the end surface 401 of the end plate 400 but also on the bottom surface 211a of the power storage element 210 located on the side of the end surface 401. Therefore, the creepage distance between the end plate 400 and the power storage element 210 at the lower end of the spacer 302 is further increased, which further improves safety. Similarly, the facing portion 324 of the spacer 302 also has a first facing portion 325 facing the end surface 402 of the end plate 400 and a second facing portion 326 facing the top surface 211d of the power storage element 210. Therefore, the facing portion 324 can further increase the creepage distance between the end plate 400 and the power storage element 210 at the upper end portion of the spacer 302.
　本実施の形態では、図７に示すように、第二対向部３２２の、スペーサ本体３０２ａからの突出長さＷ２は、第一対向部３２１の、スペーサ本体３０２ａからの突出長さＷ１よりも短い。 In the present embodiment, as shown in FIG. 7, the protruding length W2 of the second facing portion 322 from the spacer main body 302a is shorter than the protruding length W1 of the first facing portion 321 from the spacer main body 302a. ..
　この構成によれば、エンドプレート４００の端面４０１の広い範囲に対向して第一対向部３２１が設けられ、かつ、蓄電素子２１０の底面２１１ａをより多く露出した状態で、第二対向部３２２が設けられる。そのため、図６に示すように、蓄電素子２１０の底面２１１ａの広い範囲を、外装体１００の内底面１１３に直接的に接着できる。本実施の形態では、蓄電素子２１０の底面２１１ａは、外装体１００の内底面１１３の載置面部１１３ａに、接着剤９０によって接着されている。つまり、スペーサ３０２の下端部における蓄電素子２１０とエンドプレート４００との間の沿面距離を増加させ、かつ、蓄電素子２１０を強固に固定できる。これにより、蓄電装置１０の耐振動性または耐衝撃性を向上させることができる。 According to this configuration, the second facing portion 322 is provided with the first facing portion 321 facing a wide range of the end surface 401 of the end plate 400, and the bottom surface 211a of the power storage element 210 is exposed more. It will be provided. Therefore, as shown in FIG. 6, a wide range of the bottom surface 211a of the power storage element 210 can be directly adhered to the inner bottom surface 113 of the exterior body 100. In the present embodiment, the bottom surface 211a of the power storage element 210 is adhered to the mounting surface portion 113a of the inner bottom surface 113 of the exterior body 100 by the adhesive 90. That is, the creepage distance between the power storage element 210 and the end plate 400 at the lower end of the spacer 302 can be increased, and the power storage element 210 can be firmly fixed. Thereby, the vibration resistance or the impact resistance of the power storage device 10 can be improved.
　第二対向部３２２の突出長さＷ２をより長くすることで、蓄電素子２１０の底面２１１ａのほぼ全域を第二対向部３２２で覆うことも可能である。この場合、第二対向部３２２による、蓄電素子２１０とエンドプレート４００との間の沿面距離の増加効果はさらに向上される。しかしながら、本実施の形態では、蓄電素子２１０の底面２１１ａの広い範囲を露出するように、第二対向部３２２の突出長さＷ２が決定されている。これにより、蓄電素子２１０とエンドプレート４００との電気的な絶縁に実質的な問題がない程度の長さの沿面距離を確保し、かつ、蓄電素子２１０の底面２１１ａの、外装体１００の載置面部１１３ａに対する広い接着面積を確保している。 By making the protruding length W2 of the second facing portion 322 longer, it is possible to cover almost the entire area of the bottom surface 211a of the power storage element 210 with the second facing portion 322. In this case, the effect of increasing the creepage distance between the power storage element 210 and the end plate 400 by the second facing portion 322 is further improved. However, in the present embodiment, the protruding length W2 of the second facing portion 322 is determined so as to expose a wide range of the bottom surface 211a of the power storage element 210. As a result, a creepage distance of a length that does not substantially cause a problem in electrical insulation between the power storage element 210 and the end plate 400 is secured, and the exterior body 100 is placed on the bottom surface 211a of the power storage element 210. A wide adhesive area with respect to the surface portion 113a is secured.
　本実施の形態では、図７に示すように、第一対向部３２１の厚みＴ１と、第二対向部３２２の厚みＴ２とは異なる。 In the present embodiment, as shown in FIG. 7, the thickness T1 of the first facing portion 321 and the thickness T2 of the second facing portion 322 are different.
　この構成によれば、エンドプレート４００及び蓄電素子２１０のサイズ、並びに、エンドプレート４００の、蓄電素子２１０に対する相対位置に応じて、第一対向部３２１及び第二対向部３２２の厚みを互いに独立して決定できる。本実施の形態では、Ｚ軸方向の位置がほぼ同一であるエンドプレート４００の端面４０１と、蓄電素子２１０の底面２１１ａとに対し、第一対向部３２１の厚みＴ１を第二対向部３２２の厚みＴ２よりも薄く形成している。これにより、第二対向部３２２は、蓄電素子２１０の底面２１１ａに当接させることで、蓄電素子２１０の位置規制を行う規制部として機能させることができる。さらに、第一対向部３２１は、エンドプレート４００の端面４０１から離間させることで、蓄電素子２１０とエンドプレート４００との間の沿面距離を増加させることができる。このように、本実施の形態に係るスペーサ３０２は、対向部３２０の形状及びサイズの自由度が高いため、対向部３２０による沿面距離をさらに延ばすための形状またはサイズにできる。スペーサ３０２の上端部の対向部３２４も、対向部３２０と同様に、第一対向部３２５及び第二対向部３２６の、スペーサ本体３０２ａからの突出長さまたは厚み等を、第一対向部３２５と第二対向部３２６とで独立して決定してもよい。 According to this configuration, the thicknesses of the first facing portion 321 and the second facing portion 322 are independent of each other according to the sizes of the end plate 400 and the power storage element 210 and the relative positions of the end plate 400 with respect to the power storage element 210. Can be decided. In the present embodiment, the thickness T1 of the first facing portion 321 is the thickness of the second facing portion 322 with respect to the end surface 401 of the end plate 400 and the bottom surface 211a of the power storage element 210 having substantially the same position in the Z-axis direction. It is formed thinner than T2. As a result, the second facing portion 322 can function as a regulating portion that regulates the position of the power storage element 210 by abutting the bottom surface 211a of the power storage element 210. Further, the first facing portion 321 can be separated from the end surface 401 of the end plate 400 to increase the creepage distance between the power storage element 210 and the end plate 400. As described above, since the spacer 302 according to the present embodiment has a high degree of freedom in the shape and size of the facing portion 320, the spacer 302 can be shaped or sized so as to further extend the creepage distance by the facing portion 320. Similarly to the facing portion 320, the facing portion 324 at the upper end of the spacer 302 also has the protrusion length or thickness of the first facing portion 325 and the second facing portion 326 from the spacer main body 302a, and the like, and the first facing portion 325. It may be determined independently of the second facing portion 326.
　本実施の形態では、図３、図５Ａ及び図５Ｂに示すように、対向部３２０は、エンドプレート４００の端面４０１に沿って延在している。 In the present embodiment, as shown in FIGS. 3, 5A and 5B, the facing portion 320 extends along the end face 401 of the end plate 400.
　この構成によれば、蓄電素子２１０の長側面２１１ｂに沿ってスペーサ３０２が配置された構造において、長側面２１１ｂと略同一の大きさのエンドプレート４００と、蓄電素子２１０との間の沿面距離（スペーサ３０２の下端部における沿面距離）が増加される。つまり、Ｘ軸方向の広い範囲で沿面距離の増加効果を得ることができ、安全性がさらに向上される。 According to this configuration, in a structure in which the spacer 302 is arranged along the long side surface 211b of the power storage element 210, the creepage distance between the end plate 400 having substantially the same size as the long side surface 211b and the power storage element 210 ( The creepage distance at the lower end of the spacer 302) is increased. That is, the effect of increasing the creepage distance can be obtained in a wide range in the X-axis direction, and the safety is further improved.
　［４．変形例の説明］
　以上、本実施の形態に係る蓄電装置１０について説明したが、本発明は、上記実施の形態には限定されない。つまり、今回開示された実施の形態は、全ての点で例示であって制限的なものではなく、請求の範囲と均等の意味及び範囲内での全ての変更が含まれる。 [4. Description of modification]
Although the power storage device 10 according to the present embodiment has been described above, the present invention is not limited to the above-described embodiment. That is, the embodiment disclosed this time is exemplary in all respects and is not restrictive, and includes all modifications within the meaning and scope equivalent to the claims.
　例えば、蓄電素子列２０１の端部に位置するスペーサ３０２の外側に、エンドプレート４００以外の板部材が配置されてもよい。スペーサ３０２の外側に、スペーサ３０２または外装体１００を補強するための、金属製かつ板状の補強部材が配置された場合を想定する。この場合、その板状の補強部材の端面に対向する対向部３２０をスペーサ３０２が有することで、蓄電素子２１０と補強部材との間の沿面距離が増加される。スペーサ３０２の外側に、制御基板もしくはリレー等の電気機器が収容されたケースが配置されてもよい。この場合であっても、当該ケースが金属製の場合、そのケースの端面（下向きの面）に対向する対向部３２０をスペーサ３０２が有することで、蓄電素子２１０と当該ケースとの間の沿面距離が増加される。 For example, a plate member other than the end plate 400 may be arranged outside the spacer 302 located at the end of the power storage element row 201. It is assumed that a metal and plate-shaped reinforcing member for reinforcing the spacer 302 or the exterior body 100 is arranged outside the spacer 302. In this case, the spacer 302 has the facing portion 320 facing the end surface of the plate-shaped reinforcing member, so that the creepage distance between the power storage element 210 and the reinforcing member is increased. A case containing an electric device such as a control board or a relay may be arranged outside the spacer 302. Even in this case, if the case is made of metal, the spacer 302 has a facing portion 320 facing the end surface (downward surface) of the case, so that the creepage distance between the power storage element 210 and the case Is increased.
　蓄電素子２１０の底面２１１ａと外装体１００の内底面１１３とを接着剤９０で接着することは必須ではない。例えば、蓄電ユニット２００の上方に配置される中蓋またはバスバーフレームなどの他の部材で蓄電ユニット２００を外装体１００の内部の所定の位置に固定できる場合、蓄電素子２１０の底面２１１ａと内底面１１３とを接着しなくてもよい。 It is not essential to bond the bottom surface 211a of the power storage element 210 and the inner bottom surface 113 of the exterior body 100 with the adhesive 90. For example, when the power storage unit 200 can be fixed to a predetermined position inside the exterior body 100 by another member such as an inner lid or a bus bar frame arranged above the power storage unit 200, the bottom surface 211a and the inner bottom surface 113 of the power storage element 210 can be fixed. It is not necessary to bond with.
　スペーサ３０２は、スペーサ本体３０２ａの下端部においてＸ軸方向の全域に対向部３２０を有しなくてもよい。例えば、スペーサ本体３０２ａの下端部においてＸ軸方向に離間して複数の対向部３２０が設けられていてもよい。この場合であっても、複数の対向部３２０それぞれの存在範囲において、沿面距離の増加効果を得ることができる。対向部３２０は、スペーサ本体３０２ａの下端部において、Ｘ軸方向における、エンドプレート４００等の板部材の存在範囲の全域に配置されることが好ましい。つまり、板部材の端面に対向する位置に必ず対向部３２０が配置されていることで、スペーサ３０２を挟んで隣り合う蓄電素子２１０と板部材との電気的な絶縁の確実性が向上する。 The spacer 302 does not have to have the facing portion 320 in the entire area in the X-axis direction at the lower end portion of the spacer main body 302a. For example, a plurality of facing portions 320 may be provided at the lower end portion of the spacer main body 302a so as to be separated from each other in the X-axis direction. Even in this case, the effect of increasing the creepage distance can be obtained in the existence range of each of the plurality of facing portions 320. It is preferable that the facing portion 320 is arranged at the lower end portion of the spacer main body 302a in the entire range of existence of the plate member such as the end plate 400 in the X-axis direction. That is, since the facing portion 320 is always arranged at a position facing the end surface of the plate member, the certainty of electrical insulation between the power storage element 210 adjacent to each other with the spacer 302 sandwiched between the plate member is improved.
　対向部３２０が第二対向部３２２を有することも必須ではない。つまり、スペーサ３０２は、スペーサ３０２の側方に位置するエンドプレート４００等の板部材の端面に対向する対向部３２０（つまり第一対向部３２１）を有することで、対向部３２０による、蓄電素子２１０と板部材との間の沿面距離の増加効果を得ることができる。 It is not essential that the facing portion 320 has the second facing portion 322. That is, the spacer 302 has the facing portion 320 (that is, the first facing portion 321) facing the end surface of the plate member such as the end plate 400 located on the side of the spacer 302, so that the power storage element 210 by the facing portion 320 The effect of increasing the creepage distance between the plate member and the plate member can be obtained.
　スペーサ３００を形成する材料として、樹脂以外の電気的な絶縁性を有する材料が採用されてもよい。スペーサ３００は、マイカまたはガラス繊維などの無機材料で形成されていてもよく、これら樹脂以外の材料と樹脂との両方を含む材料で形成されていてもよい。金属製の基材の表面に絶縁性樹脂をコーティングすることでスペーサ３００が形成されてもよい。つまり、スペーサ３００は、スペーサ３００に接触する複数の部材間で導通しない絶縁性を有すればよく、その材料は、要求される剛性、耐久性、耐熱性、難燃性、または重量等に応じて、適宜決定されてもよい。 As the material for forming the spacer 300, a material having electrical insulation other than resin may be adopted. The spacer 300 may be formed of an inorganic material such as mica or glass fiber, or may be formed of a material other than these resins and a material containing both the resin. The spacer 300 may be formed by coating the surface of a metal base material with an insulating resin. That is, the spacer 300 may have an insulating property that does not conduct between a plurality of members in contact with the spacer 300, and the material thereof depends on the required rigidity, durability, heat resistance, flame retardancy, weight, and the like. It may be determined as appropriate.
　上記実施の形態及びその変形例に含まれる構成要素を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。 The scope of the present invention also includes a form constructed by arbitrarily combining the above-described embodiments and the components included in the modified examples.
　本発明は、リチウムイオン二次電池等の蓄電素子２１０を備えた蓄電装置等に適用できる。 The present invention can be applied to a power storage device or the like provided with a power storage element 210 such as a lithium ion secondary battery.
　　１０　蓄電装置
　　４０　補強部材
　　８０　ボルト
　２０１　蓄電素子列
　２１０　蓄電素子
　２１１　容器
　２１１ａ　底面
　２１１ｂ　長側面
　２１１ｃ　短側面
　２１１ｄ　天面
　３００、３０１、３０２　スペーサ
　３０２ａ　スペーサ本体
　３２０、３２４　対向部
　３２１、３２５　第一対向部
　３２２、３２６　第二対向部
　４００　エンドプレート
　４０１、４０２　端面 10 Power storage device 40 Reinforcing member 80 Volts 201 Power storage element row 210 Power storage element 211 Container 211a Bottom surface 211b Long side surface 211c Short side surface 211d Top surface 300, 301, 302 Spacer 302a Spacer body 320, 324 Opposing part 321 325 First facing part 322 326 Second facing part 400 End plate 401, 402 End face

Claims (5)

  1. 　蓄電素子と、
    　導電性を有する板部材と、
    　スペーサとを備え、
    　前記スペーサは、
    　前記蓄電素子の第一側面と、前記板部材の側面との間に配置されたスペーサ本体と、
    　前記スペーサ本体の端部に設けられて、前記板部材の端面に対向する対向部と、を有する、
    　蓄電装置。     Power storage element and
    With conductive plate members
    With spacers
    The spacer is
    A spacer body arranged between the first side surface of the power storage element and the side surface of the plate member,
    It has a facing portion provided at the end portion of the spacer body and facing the end surface of the plate member.
    Power storage device.
  2. 　前記対向部は、前記板部材の端面に対向する第一対向部と、前記蓄電素子の、前記第一側面に隣接する第二側面に対向する第二対向部とを有する、
    　請求項１記載の蓄電装置。     The facing portion has a first facing portion facing the end surface of the plate member and a second facing portion of the power storage element facing the second side surface adjacent to the first side surface.
    The power storage device according to claim 1.
  3. 　前記第二対向部の、前記スペーサ本体からの突出長さは、前記第一対向部の、前記スペーサ本体からの突出長さよりも短い、
    　請求項２記載の蓄電装置。     The protruding length of the second facing portion from the spacer main body is shorter than the protruding length of the first facing portion from the spacer main body.
    The power storage device according to claim 2.
  4. 　前記第一対向部の厚みと、前記第二対向部の厚みとは異なる、
    　請求項２または３記載の蓄電装置。     The thickness of the first facing portion is different from the thickness of the second facing portion.
    The power storage device according to claim 2 or 3.
  5. 　前記対向部は、前記板部材の前記端面に沿って延在する、
    　請求項１～４のいずれか一項に記載の蓄電装置。     The facing portion extends along the end face of the plate member.
    The power storage device according to any one of claims 1 to 4.
PCT/JP2021/008442 2020-03-18 2021-03-04 Power storage device WO2021187133A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014010983A (en) * 2012-06-28 2014-01-20 Sanyo Electric Co Ltd Power supply device, and vehicle and power storage device having the power supply device
JP2014182944A (en) * 2013-03-19 2014-09-29 Gs Yuasa Corp Power storage device
JP2015111493A (en) * 2012-03-28 2015-06-18 三洋電機株式会社 Power supply device, and vehicle and power storage device comprising the same
WO2018230390A1 (en) * 2017-06-12 2018-12-20 株式会社Ｇｓユアサ Power storage device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015111493A (en) * 2012-03-28 2015-06-18 三洋電機株式会社 Power supply device, and vehicle and power storage device comprising the same
JP2014010983A (en) * 2012-06-28 2014-01-20 Sanyo Electric Co Ltd Power supply device, and vehicle and power storage device having the power supply device
JP2014182944A (en) * 2013-03-19 2014-09-29 Gs Yuasa Corp Power storage device
WO2018230390A1 (en) * 2017-06-12 2018-12-20 株式会社Ｇｓユアサ Power storage device

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