WO2022254931A1 - Dispositif de stockage d'énergie - Google Patents

Dispositif de stockage d'énergie Download PDF

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Publication number
WO2022254931A1
WO2022254931A1 PCT/JP2022/015747 JP2022015747W WO2022254931A1 WO 2022254931 A1 WO2022254931 A1 WO 2022254931A1 JP 2022015747 W JP2022015747 W JP 2022015747W WO 2022254931 A1 WO2022254931 A1 WO 2022254931A1
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WO
WIPO (PCT)
Prior art keywords
power storage
spacer
storage element
axis direction
exterior body
Prior art date
Application number
PCT/JP2022/015747
Other languages
English (en)
Japanese (ja)
Inventor
泰行 岩嶋
敦之 小西
晃希 前田
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
Priority to JP2023525627A priority Critical patent/JPWO2022254931A1/ja
Publication of WO2022254931A1 publication Critical patent/WO2022254931A1/fr

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    • 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
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • 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
    • H01M50/289—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 power storage elements and spacers.
  • Patent Document 1 discloses an assembled battery (power storage device) that includes battery cells (power storage elements) and cell holders (spacers) that hold the battery cells, and in which the cell holders are provided with first discharge holes for discharging condensed water. disclosed.
  • the spacer In a configuration in which a spacer is arranged below an electric storage element, if electrolyte leaking from the electric storage element to the spacer or liquid such as condensed water accumulated in the spacer drips downward from the spacer, the electric storage element and the spacer will be damaged.
  • the liquid may cause a short circuit with the lower conductive member (another storage element or the like).
  • the spacer (cell holder) is provided with the first discharge hole for discharging the condensed water. and the conductive member below the spacer (cell holder) may be short-circuited by the condensed water.
  • the present invention has been made by the inventors of the present invention by focusing on the above problem, and an object of the present invention is to provide a power storage device capable of suppressing a short circuit between a power storage element and a conductive member below due to liquid. do.
  • a power storage device is a power storage device including a power storage element and a spacer disposed below the power storage element, wherein the spacer intersects a spacer body and a vertical direction of the spacer body. and a projecting portion projecting downward from a second end portion having a lower height than the adjacent first end portion among the end portions in the intersecting direction.
  • the present invention can be realized not only as a power storage device, but also as a spacer.
  • the power storage device of the present invention it is possible to suppress the short circuit between the power storage element and the lower conductive member due to the liquid.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view showing components of the power storage unit according to the embodiment.
  • FIG. 3 is an exploded perspective view showing each component of the power storage unit according to the embodiment.
  • FIG. 4 is an exploded perspective view showing each component by disassembling the electric storage element according to the embodiment.
  • FIG. 5 is a perspective view showing the configuration of an intermediate spacer according to the embodiment.
  • 6A and 6B are a perspective view and a cross-sectional view showing the positional relationship between the first exterior body, the storage element, the end spacers, and the intermediate spacers according to the embodiment.
  • a power storage device is a power storage device including a power storage element and a spacer disposed below the power storage element, wherein the spacer intersects a spacer body and a vertical direction of the spacer body. and a projecting portion projecting downward from a second end portion having a lower height than the adjacent first end portion among the end portions in the intersecting direction.
  • the spacer below the power storage element is arranged downward from the second end, which is lower in height than the adjacent first end, among the ends in the cross direction crossing the vertical direction of the spacer body. It has a protruding part that protrudes into the
  • liquid such as electrolytic solution or condensed water accumulated in the spacer is It can be guided downward from the second end by the projection and discharged. As a result, it is possible to prevent the electric storage element from being short-circuited with the conductive member below due to the liquid.
  • the projecting portion may have a first groove portion that is recessed in the cross direction and extends in the vertical direction.
  • the protruding part since the protruding part has the first groove part, the first groove part serves as a flow path for the liquid, and the liquid tends to fall along the first groove part. Therefore, when the liquid accumulated in the spacer is discharged downward by the projecting portion, it can be easily guided downward and discharged.
  • the power storage device may further include another power storage element arranged below the spacer, and the projecting portion may be arranged so as to protrude below the other power storage element.
  • the protruding portion is arranged so as to protrude further downward than the other power storage elements below the spacer, when the liquid accumulated in the spacer is drained downward by the protruding portion, the liquid is discharged below the other storage element. As a result, it is possible to prevent the electric storage element from short-circuiting with other electric storage elements below due to the liquid.
  • the first end may be a wall projecting upward, and the second end may be a recess recessed downward from the wall.
  • the first end is the wall and the second end is the recess recessed from the wall, so the liquid accumulated in the spacer drops from the first end. is suppressed, and it becomes easy to fall from the second end. As a result, the liquid is prevented from falling from locations other than the projecting portion, and is easily discharged downward from the second end portion by the projecting portion.
  • the spacer body may have a second groove extending toward the second end.
  • the second groove portion serves as a flow path for the liquid, and the liquid accumulated on the spacer main body is discharged to the second groove portion. It can be easily led to the two ends. Thereby, the liquid can be easily discharged downward from the second end by the projecting portion.
  • the longitudinal direction of the exterior body of the power storage device, the arrangement direction of a plurality of power storage elements such as the first power storage element and the second power storage element, the alignment direction of the power storage unit and the control unit, and the container of the power storage device , or the direction in which a pair of electrode terminals are arranged in one storage element is defined as the X-axis direction.
  • the direction in which the electric storage elements and the busbars are arranged, or the direction in which the main body and lid of the container for the electric storage elements are arranged is defined as the Y-axis direction.
  • the stacking direction or vertical direction is defined as the Z-axis direction.
  • These X-axis direction, Y-axis direction, and Z-axis direction are directions that cross each other (perpendicularly in this 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 positive direction of the X-axis indicates the direction of the arrow on the X-axis
  • the negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis.
  • the Z-axis direction may also be referred to as the first direction
  • the Y-axis direction may also be referred to as the second direction or the cross direction
  • the X-axis direction may also be referred to as the third direction.
  • Expressions indicating relative directions or orientations, such as parallel and orthogonal also include cases where the directions or orientations are not strictly speaking.
  • two directions are orthogonal not only means that the two directions are completely orthogonal, but also substantially orthogonal, that is, for example, a difference of about several percent It is also meant to include
  • FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to this embodiment.
  • FIG. 2 and FIG. 3 are exploded perspective views showing respective constituent elements of power storage unit 10 according to the present embodiment.
  • FIG. 3 shows an exploded view of each component fixed to first exterior body 110 of power storage unit 10 shown in FIG. 2 .
  • the power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment.
  • the power storage device 1 is a battery module (assembled battery) used for power storage or power supply.
  • the power storage device 1 is, for example, an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a rolling stock for an electric railway. It is used as a battery etc.
  • Examples of such vehicles include electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and gasoline vehicles.
  • Examples of railway vehicles for the electric railway include electric trains, monorails, linear motor cars, and hybrid trains having both diesel engines and electric motors.
  • the power storage device 1 can also be used as a stationary battery or the like for home use or for a power generator.
  • the power storage device 1 includes a power storage unit 10 and a control unit 20.
  • the portion of the power storage device 1 that has the power storage element 400 is referred to as power storage unit 10
  • the portion that includes a control device for controlling power storage element 400 is referred to as control unit 20 .
  • the power storage unit 10 has an exterior body 100 and a first reinforcing member 200 . Inside the exterior body 100 , a power storage element 400 , a spacer 500 , a restraint body 600 , a busbar frame 700 , a busbar 800 , and a conductive member 900 . , and the control unit 20 and the like are housed therein.
  • a pair of (positive electrode side and negative electrode side) external terminals 21 and 22 and a connector 23 are arranged in the exterior body 100 . Each component will be described in detail below.
  • the exterior body 100 is a box-shaped (substantially rectangular parallelepiped) container (module case) that constitutes the exterior body of the power storage device 1 .
  • the exterior body 100 is arranged outside the power storage elements 400 and the like, fixes the power storage elements 400 and the like at predetermined positions, and protects them from impacts and the like.
  • the exterior body 100 has a first exterior body 110 , a second exterior body 120 , a fixing member 130 , a gasket 140 and a second reinforcing member 300 .
  • the first exterior body 110 is a flat rectangular member that constitutes the main body of the exterior body 100, on which the power storage element 400 and the like are placed and fixed.
  • the second exterior body 120 is a bottomed rectangular cylindrical member that constitutes the lid of the exterior body 100, is arranged in the positive Z-axis direction of the first exterior body 110, and is connected to the first exterior body 110. cover the power storage element 400 and the like.
  • An opening is formed in the second exterior body 120 in the negative direction of the Z axis, and the first exterior body 110 is arranged so as to block the opening of the second exterior body 120 .
  • the first exterior body 110 is made of a metal member such as stainless steel, aluminum, aluminum alloy, iron, steel plate, or the like, or the metal that has been subjected to insulation treatment such as insulation coating, from the viewpoint of ensuring safety (breakage resistance). It is formed of a highly rigid member such as a member.
  • the second exterior body 120 is made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE), )), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene/perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone ( PES), ABS resin, or a resin member (insulating member) such as a composite material thereof.
  • the first exterior body 110 may be made of the same resin member as the second exterior body 120, but is preferably made of a highly rigid member.
  • the second exterior body 120 may be made of the same metal member as the first exterior body 110 .
  • the first exterior body 110 has a first connection portion 111 , mounting bases 113 , 114 and 115 , and an exterior body convex portion 116 .
  • the second exterior body 120 has a second connection portion 121 .
  • the first connection portion 111 is a portion (flange portion) that is arranged on the outer peripheral portion of the first exterior body 110 and has an angular ring shape when viewed from above (as seen from the Z-axis direction).
  • the first connection portion 111 is arranged at a position facing the second connection portion 121 of the second exterior body 120 , overlaps the second connection portion 121 , and is connected to the second connection portion 121 .
  • the second connection portion 121 is a square ring-shaped portion (flange portion) arranged on the outer peripheral portion of the second exterior body 120 when viewed from above.
  • the second connection portion 121 is arranged at a position facing the first connection portion 111 , overlaps the first connection portion 111 , and is connected to the first connection portion 111 .
  • the first connection portion 111 and the second connection portion 121 are connection portions that are overlapped and connected to each other in the Z-axis direction (first direction), and are connected in the Y-axis direction (second direction intersecting the first direction) and It extends in the X-axis direction (the third direction intersecting the first direction and the second direction).
  • the mounting bases 113 and 114 are members to which the restraining body 600 is attached. Specifically, the mounting base 113 is arranged at the end of the first exterior body 110 in the negative Y-axis direction, and is attached to a portion of the restraining body 600 on the negative Y-axis direction side of the first restraining body 610 described later. The mounting base 114 is arranged at the end of the first exterior body 110 in the positive Y-axis direction, and the portion of the first restricting body 610 on the positive Y-axis direction side is attached thereto. More specifically, mounting bases 113 and 114 have bolt portions, and by fastening the bolt portions to nuts, restraining body 600 (first restraining body 610) is attached to mounting bases 113 and 114. It is attached.
  • the mounting base 115 is a member to which the conductive member 900 is mounted. Specifically, the mounting base 115 is arranged at the center in the X-axis direction and the end in the positive Y-axis direction of the first exterior body 110, and mounting portions 913 and 923, which will be described later, of the conductive member 900 are mounted thereon. More specifically, mounting base 115 has a bolt portion, and conductive member 900 (mounting portions 913 and 923) is attached to mounting base 115 by fastening the bolt portion to a nut.
  • the exterior body convex portion 116 is a convex portion that protrudes toward the power storage element 400 .
  • the exterior body convex portion 116 is disposed in the center portion of the first exterior body 110 in the Y-axis direction, and has a rectangular shape in a top view and a bulging portion (bulge part).
  • Four exterior body protrusions 116 are arranged side by side in the X-axis direction corresponding to the four power storage elements 400 aligned in the X-axis direction.
  • Each convex portion 116 of the exterior body is arranged at a position facing the central portion of a long side surface 411 a of the storage element 400 , which will be described later, and presses the central portion of the storage element 400 .
  • a control wire (also referred to as a communication line, control line, communication cable, or control cable) that transmits information such as the voltage or temperature of the storage element 400 is connected to the control unit 20 inside the second exterior body 120 . Thereby, information such as the voltage or temperature of the storage element 400 is transmitted to and from the control unit 20 .
  • the control unit 20 is electrically connected to the connector 23, thereby transmitting the information to the outside.
  • the gasket 140 is a gasket arranged between the first exterior body 110 and the second exterior body 120 .
  • the gasket 140 is an O-ring that is arranged between the first connection portion 111 and the second connection portion 121 and has a rectangular ring shape when viewed from above. More specifically, the gasket 140 is arranged between the first connecting portion 111 and the second connecting portion 121 in a state of being compressed to the first connecting portion 111 and the second connecting portion 121 .
  • the gasket 140 is made of, for example, rubber (natural rubber, synthetic rubber), or any resin material such as PC, PP, or PE that can be used for the second exterior body 120 .
  • the second reinforcing member 300 is a member arranged at a position sandwiching the second exterior body 120 with the first exterior body 110 and extending along the outer peripheral portions of the first exterior body 110 and the second exterior body 120 .
  • the second reinforcing member 300 is arranged at a position sandwiching the second connecting portion 121 with the first connecting portion 111 and extends in the X-axis direction or the Y-axis direction (the third direction or the second direction).
  • two second reinforcing members 301 extending in the X-axis direction (third direction) are arranged for the first connection portion 111 and the second connection portion 121 on both sides in the Y-axis direction.
  • Two second reinforcing members 302 extending in the Y-axis direction (second direction) are arranged for the first connection portion 111 and the second connection portion 121 on both sides in the X-axis direction.
  • four second reinforcing members 300 are arranged over substantially the entire outer peripheral portions of the first exterior body 110 and the second exterior body 120. be done. In other words, the second reinforcing member 300 extends across the multiple securing members 130 .
  • the second reinforcing member 300 is formed of a metal member such as stainless steel, aluminum, an aluminum alloy, iron, or steel plate, or a highly rigid member such as the metal member subjected to insulation treatment such as insulating coating.
  • the first connection portion 111 is, for example, a metal (high rigidity) flange portion
  • the second connection portion 121 is, for example, a resin (low rigidity) flange portion. Therefore, the second connecting portion 121 has lower rigidity than at least one of the first connecting portion 111 and the second reinforcing member 300 .
  • first connecting portion 111 and the second reinforcing member 300 both the first connecting portion 111 and the second reinforcing member 300 in the present embodiment
  • second connection portion 121 has lower rigidity than both first connection portion 111 and second reinforcing member 300 .
  • High (or low) rigidity means strong (or weak) against external forces, and is defined as a state in which dimensional change is small (or large) against bending and torsional forces.
  • the second connection portion 121 has lower rigidity than the first connection portion 111, when the central portions of the areas of the same size of the first connection portion 111 and the second connection portion 121 are pressed with the same force, This means that the second connection portion 121 has a larger dimensional change (amount of deflection). Alternatively, it can be said that the second connection portion 121 requires less force than the first connection portion 111 to cause the same dimensional change.
  • the second connecting portion 121 may have lower rigidity as a whole than at least one of the first connecting portion 111 and the second reinforcing member 300 .
  • the second connecting portion 121 may have lower material rigidity than at least one of the first connecting portion 111 and the second reinforcing member 300 (may be formed of a material having lower rigidity), or may be structurally
  • the rigidity may be relatively low (it may be configured in a shape with low rigidity).
  • the fixing member 130 has a first fixing member 131 and a second fixing member 132 .
  • the first fixing member 131 and the second fixing member 132 are members that are connected (joined) to each other to connect (join) the first exterior body 110 and the second exterior body 120 .
  • a plurality of second fixing members 132 are arranged side by side at substantially equal intervals in the first connection portion 111
  • a plurality of first fixing members 132 are arranged in positions corresponding to the second fixing members 132 of the second connection portion 121 .
  • the fixing members 131 are arranged side by side. Thereby, the first fixing member 131 and the second fixing member 132 connect (bond) the first connecting portion 111 and the second connecting portion 121 together with the second reinforcing member 300 .
  • the first fixing member 131 is a bolt
  • the second fixing member 132 is a nut to which the bolt is fastened.
  • a through hole 111 a is formed in the first connecting portion 111
  • a through hole 121 a is formed in the second connecting portion 121
  • a through hole 311 is formed in the second reinforcing member 300 .
  • the male threaded portion of the first fixing member 131 is inserted into these through holes 311 , 121 a and 111 a , and the male threaded portion is fastened to the female threaded portion of the second fixing member 132 .
  • first fixing member 131 and the second fixing member 132 sandwich the second connecting portion 121 between the first connecting portion 111 and the second reinforcing member 300 , and the second reinforcing member 131 moves toward the second connecting portion 121 .
  • the first connection portion 111 and the second connection portion 121 are connected (fixed) by pressing the member 300 .
  • the second fixing member 132 may be a bolt, and the first fixing member 131 may be a nut to which the bolt is fastened.
  • the method of connecting (bonding) the first exterior body 110 and the second exterior body 120 may be other methods, such as riveting, crimping, clipping, bonding, welding, heat sealing, and ultrasonic welding. etc.
  • the first reinforcing member 200 is a plate-shaped member arranged along the exterior body 100 and aligned with the power storage element 400 in the Z-axis direction (first direction).
  • the first reinforcing member 200 is attached to the outer surface of the exterior body 100 .
  • the first reinforcing member 200 is a rectangular corrugated plate extending in the X-axis direction along the first exterior body 110 in the negative Z-axis direction of the power storage element 400 and the first exterior body 110. It is a shaped member.
  • the first reinforcing member 200 contacts and is attached to the outer surface of the first exterior body 110 on the negative side of the Z-axis.
  • the first reinforcing member 200 may be formed by bending a plate member into a corrugated plate shape, or may be formed by casting (die casting) or the like.
  • the first reinforcing member 200 is fixed together with the second connecting portion 121 and the second reinforcing member 300 by the fixing member 130 (the first fixing member 131 and the second fixing member 132) at both ends in the X-axis direction. , is attached to the first connecting portion 111 .
  • the first reinforcing member 200 has reinforcing member connecting portions 210 in which through holes 211 are formed at both ends in the X-axis direction.
  • the second reinforcing members 300 are not arranged at positions corresponding to the fixing members 130 arranged at both ends in the X-axis direction and both ends in the Y-axis direction (corners in the X-axis direction and the Y-axis direction). Therefore, the first reinforcing member 200 is attached to the first connecting portion 111 together with the second connecting portion 121 at the corner. In other words, the first reinforcing member 200 is attached to the first exterior body 110 together with the second exterior body 120 at the corner.
  • the power storage element 400 is a secondary battery (single battery) capable of charging and discharging electricity.
  • the power storage element 400 is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the power storage elements 400 have a flattened rectangular parallelepiped shape (rectangular shape). 411a faces the Z-axis direction), and are arranged in the Z-axis direction and the X-axis direction.
  • two first power storage elements 401 are stacked (flat stacked) in the Z-axis direction
  • two second power storage elements 402 are stacked (flat stacked) in the Z-axis direction
  • two third power storage elements 403 are stacked (flat stacked).
  • Two fourth power storage elements 404 are stacked (flat stacked) in the Z-axis direction.
  • Two first power storage elements 401, two second power storage elements 402, two third power storage elements 403, and two fourth power storage elements 404 extend from the negative direction of the X axis to the positive direction of the X axis. arranged in a row.
  • the number of power storage elements 400 is not particularly limited, and any number of power storage elements 400 may be arranged (stacked) in the Z-axis direction, and how many power storage elements 400 may be arranged (arranged) in the X-axis direction.
  • the shape of the electric storage element 400 is not limited to the rectangular shape described above, and may be other shapes such as a polygonal columnar shape, a cylindrical shape, an elliptical columnar shape, and an oval columnar shape.
  • the storage element 400 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor.
  • the power storage element 400 may be a primary battery that can use stored electricity without being charged by the user, instead of a secondary battery.
  • Electric storage element 400 may be a battery using a solid electrolyte.
  • the storage element 400 may be a pouch-type storage element. A detailed description of the configuration of the storage element 400 will be given later.
  • the spacer 500 is a rectangular and plate-like spacer arranged adjacent to the power storage element 400 .
  • Spacer 500 is arranged in the Z-axis plus direction or the Z-axis minus direction of storage element 400 , facing long side surface 411 a of storage element 400 .
  • the spacer 500 is formed of an insulating member such as any resin material that can be used for the second exterior body 120, or a member having a high heat insulating property such as a damper material.
  • an intermediate spacer 510 and a pair of end spacers 520 are arranged as spacers 500 .
  • the intermediate spacer 510 is the spacer 500 arranged between the two power storage elements 400
  • the end spacer 520 is the spacer 500 arranged between the power storage element 400 and the first exterior body 110 or the restraining body 600.
  • An intermediate spacer 510 and a pair of end spacers 520 are arranged so as to sandwich the power storage element 400 in the Z-axis direction, and between the power storage elements 400 and between the power storage elements 400 and the first exterior body 110 and the restraining body 600.
  • the intermediate spacer 510 is provided for each of the first power storage element 401 to the fourth power storage element 404. and a pair of end spacers 520 are arranged.
  • an insulating sheet may be arranged on the side surface of power storage element 400. FIG. A detailed description of the configuration of the intermediate spacer 510 will be given later.
  • Each of the end spacers 520 arranged on the positive side of the Z-axis has two protrusions 521 aligned in the X-axis direction at the ends in the negative Y-axis direction.
  • the protrusion 521 is inserted into a circular through-hole 611 formed in a first restraining body 610 and a circular through-hole 621 formed in a second restraining body 620 of a restraining body 600 described later in the Z-axis plus direction. It is a columnar protrusion protruding into the Thereby, the restraining body 600 can be positioned with respect to the spacer 500 (and the storage element 400).
  • the restraint body 600 is a member that sandwiches a plurality of power storage elements 400 such as the first power storage element 401 and the second power storage element 402 together with the first exterior body 110 in the Z-axis direction. Specifically, first exterior body 110 and restraint body 600 are joined together to sandwich a plurality of power storage elements 400 . Thereby, the first exterior body 110 and the restraining body 600 restrain the plurality of power storage elements 400 in the Z-axis direction (apply a restraining force in the Z-axis direction to the plurality of power storage elements 400). First exterior body 110 extends in the X-axis direction across first to fourth storage elements 401 to 404, and restraint body 600 holds first to fourth storage elements 401 to 404 respectively. Individually constrained with the single exterior body 110 .
  • the restraint body 600 is formed of a metal member or the like that can be used for the first exterior body 110 .
  • the restraining body 600 has a first restraining body 610 and a second restraining body 620.
  • the first restraint body 610 is a plate-like member arranged in the positive Z-axis direction of the second restraint body 620 and joined to the first exterior body 110 and having an inverted U shape when viewed from the X-axis direction.
  • the second restraint body 620 is a plate-like member arranged so as to cover substantially the entire side surface of the power storage element 400 and the spacer 500 (end spacer 520) in the positive Z-axis direction.
  • the first restraint body 610 and the second restraint body 620 are formed with protrusions (bulges) extending in the Y-axis direction for strength improvement.
  • the shape and number are not particularly limited, and a configuration in which no convex portion (expanded portion) is formed may be used.
  • the first restraint 610 and the second restraint 620 may be integrally formed, or the restraint 600 may not have the second restraint 620 .
  • the first storage element 401 to the fourth storage element 404 are arranged apart from each other, and the restraining bodies 600 arranged in the X-axis direction are also arranged apart from each other.
  • a heat insulating material may be placed in the gap between the first storage element 401 and the second storage element 402, thereby further suppressing the thermal influence of the first storage element 401 and the second storage element 402 on each other. can do.
  • the busbar frame 700 is a flat rectangular insulating member capable of electrically insulating the busbar 800 from other members and regulating the position of the busbar 800 .
  • the busbar frame 700 is made of, for example, any resin material that can be used for the second exterior body 120 .
  • the busbar frame 700 is arranged in the Y-axis negative direction of the plurality of power storage elements 400 and is positioned with respect to the plurality of power storage elements 400 , so that the busbar 800 is positioned with respect to the plurality of power storage elements 400 . It is joined to the electrode terminals of the plurality of power storage elements 400 .
  • the bus bar 800 is a plate-like member that is arranged in the Y-axis negative direction of the plurality of storage elements 400 and is connected (joined) to the plurality of storage elements 400 and the conductive member 900 .
  • Busbar 800 includes busbars 810 , 820 and 830 .
  • Bus bar 810 connects electrode terminals 420 (to be described later) of adjacent storage elements 400 to each other.
  • the bus bars 820 and 830 connect the electrode terminals 420 of the storage element 400 to the later-described connection portions 912 and 922 of the conductive member 900, thereby electrically connecting the storage element 400 to the positive and negative external terminals 21 and 22. do.
  • bus bar 800 and electrode terminal 420 of power storage element 400 are connected (joined) by welding, but may be connected (joined) by bolting or the like.
  • Bus bar 800 and connecting portions 912 and 922 of conductive member 900 are connected (joined) by bolting, but may be connected (joined) by welding or the like.
  • the bus bar 800 is made of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, nickel, or a combination thereof, or a conductive member other than metal.
  • the bus bar 800 connects two power storage elements 400 in parallel to form four sets of power storage element groups, and connects the four power storage element groups in series. All eight power storage elements 400 may be connected in series, or other configurations may be used.
  • the conductive member 900 is a conductive member that is connected to the bus bar 800 and the control unit 20 to electrically connect the power storage element 400 and the external terminals 21 and 22 .
  • Conductive member 900 is a conductive member (also referred to as a power line, power line, main circuit cable, power cable, or power cable) arranged on the main current (charge/discharge current) path of power storage element 400 .
  • the conductive member 900 is made of, for example, a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, or nickel, a combination thereof, or a conductive member other than metal.
  • the conductive member 900 has a conductive member 910 and a conductive member 920 .
  • the conductive member 910 has connecting portions 911 and 912 and a mounting portion 913 .
  • the conductive member 920 has connecting portions 921 and 922 and a mounting portion 923 .
  • connection portion 912 is a portion connected to the busbar 820
  • connection portion 922 is a portion connected to the busbar 830
  • the attachment portions 913 and 923 are portions attached to the attachment base 115 of the first exterior body 110 as described above.
  • conductive member 910 has a configuration in which a plate member extends from connection portion 911 to attachment portion 913 and an electric wire extends from attachment portion 913 to connection portion 912
  • the conductive member 920 has a structure in which a plate member extends from the connection portion 921 to the attachment portion 923 and an electric wire extends from the attachment portion 923 to the connection portion 922 .
  • the control unit 20 is a device having a control device (not shown) that controls the storage elements 400 in the storage unit 10 , specifically a BMS (Battery Management System) that controls the storage elements 400 .
  • the control device arranged in the control unit 20 is a device that is connected to the main current path of the storage element 400 and controls the storage element 400.
  • a circuit board, a fuse They are relays, semiconductor switches such as FETs (Field Effect Transistors), shunt resistors, and the like.
  • the control unit 20 is housed in the exterior body 100 .
  • External terminals 21 and 22 which are a pair of positive and negative module terminals (general terminals), are arranged at the ends of the exterior body 100 in the positive direction of the X axis. External terminals 21 and 22 are electrically connected to power storage element 400 of power storage unit 10 via connecting portions 911 and 921 .
  • the power storage device 1 charges electricity from the outside and discharges electricity to the outside through the external terminals 21 and 22 .
  • the external terminal 21 is a positive external terminal that is a positive external terminal
  • the external terminal 22 is a negative external terminal that is a negative external terminal.
  • the external terminals 21 and 22 are made of a conductive member made of metal such as aluminum, aluminum alloy, copper, copper alloy, or the like.
  • FIG. 4 is an exploded perspective view showing each component by disassembling the power storage element 400 according to the present embodiment. Specifically, FIG. 4 shows an exploded view of each part in a state in which the power storage element 400 shown in FIG. 3 is placed vertically (upright).
  • the electric storage element 400 includes a container 410, a pair of (positive electrode and negative electrode) electrode terminals 420, and a pair of (positive electrode and negative electrode) gaskets 430.
  • a pair of (positive electrode and negative electrode) gaskets 440 , a pair (positive electrode and negative electrode) current collectors 450 , and an electrode body 460 are housed inside the container 410 .
  • An electrolytic solution non-aqueous electrolyte
  • the type is not particularly limited as long as it does not impair the performance of the electric storage element 400, and various kinds can be selected.
  • a spacer disposed on the side or below the electrode body 460, an insulating film that wraps the electrode body 460 or the like, an insulating sheet that covers the outer surface of the container 410, or the like may be disposed.
  • the container 410 is a rectangular parallelepiped (square or box-shaped) case having a container body 411 with an opening and a container lid 412 closing the opening of the container body 411 .
  • the container 410 has a structure in which the inside can be hermetically sealed by, for example, welding the container body 411 and the container lid 412 after housing the electrode body 460 and the like inside the container body 411 .
  • the material of the container body 411 and the container lid 412 is not particularly limited, but weldable metals such as stainless steel, aluminum, aluminum alloys, iron, and plated steel plates are preferable.
  • the container main body 411 is a rectangular tubular member that constitutes the main body of the container 410 and has a bottom, and an opening is formed on the Y-axis negative direction side.
  • the container body 411 has a pair of rectangular and planar (flat) long side surfaces 411a on both side surfaces in the Z-axis direction, and a pair of rectangular and planar (flat) side surfaces on both side surfaces in the X-axis direction. It has a short side surface 411b and a rectangular planar (flat) bottom surface 411c on the Y-axis plus direction side.
  • the container lid 412 is a rectangular plate-like member that constitutes the lid of the container 410 and extends in the X-axis direction on the Y-axis minus direction side of the container body 411 .
  • the container cover 412 has a gas discharge valve 412a that releases the pressure inside the container 410 when the pressure rises, and an injection part (not shown) for injecting the electrolytic solution into the container 410. ) etc. are provided.
  • the container 410 has a container body 411 and a container lid 412 that are arranged side by side in the Y-axis direction (second direction) and joined together.
  • the first storage element 401 to the fourth storage element 404 are arranged side by side in the X-axis direction (third direction), which is the longitudinal direction of the container lid 412 .
  • the electrode body 460 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 formed by forming a positive electrode active material layer on a positive electrode substrate layer, which is a collector foil made of a metal such as aluminum or an aluminum alloy.
  • the negative electrode plate is formed by forming a negative electrode active material layer on a negative electrode substrate layer, which is a collector 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 any known material can be appropriately used as long as it can intercalate and deintercalate lithium ions.
  • electrode body 460 is formed by winding electrode plates (positive electrode plate and negative electrode plate) around a winding axis (virtual axis parallel to the X-axis direction) extending in the X-axis direction. It is a type (so-called vertically wound type) electrode assembly.
  • the electrode plates (positive electrode plate and negative electrode plate) of the electrode assembly 460 are stacked in the Z-axis direction, so the Z-axis direction is also called the stacking direction. That is, the electrode body 460 is formed by stacking electrode plates in the stacking direction.
  • the electrode body 460 has a pair of flat portions 461 aligned in the Z-axis direction and a pair of curved portions 462 aligned in the Y-axis direction by winding the electrode plate. is the stacking direction of the electrode plates in the flat portion 461 .
  • the flat portion 461 is a flat portion that connects the ends of a pair of curved portions 462, and the curved portion 462 is a portion curved in a semicircular shape or the like so as to protrude in the Y-axis direction.
  • the flat surface of the flat portion 461 faces the stacking direction.
  • the pair of flat portions 461 face each other in the stacking direction. It can be said that the plurality of first power storage elements 401 are arranged in the stacking direction.
  • the X-axis direction in which the first storage element 401 to the fourth storage element 404 are arranged is also called the arrangement direction.
  • the first storage element 401 to the fourth storage element 404 are arranged in the arrangement direction crossing the stacking direction.
  • the active material is formed (coated) at the ends of the positive electrode plate and the negative electrode plate in the shifted direction. 3) It has a part (active material layer non-formed part) where the base material layer is exposed without being exposed.
  • the electrode body 460 protrudes from the flat portion 461 and the curved portion 462 to both sides in the X-axis direction at both ends in the X-axis direction, and the active material layer non-formed portions of the positive electrode plate and the negative electrode plate are laminated to form the current collector 450 . It has an end 463 connected to the .
  • the electrode body 460 includes a so-called horizontally wound electrode body formed by winding electrode plates around a winding axis extending in the Y-axis direction, and a laminated type ( Any type of electrode body may be used, such as a stack type electrode body or a bellows-shaped electrode body in which electrode plates are folded into a bellows shape.
  • the flat portion is the flat portion other than the curved portion and the connection portion (tab) with the current collector.
  • a flat portion is a flat portion other than the connection portion (tab) with the current collector.
  • the electrode terminals 420 are terminals (a positive terminal and a negative terminal) of the power storage element 400, and are arranged on the container lid 412 so as to protrude in the negative direction of the Y axis.
  • the electrode terminal 420 is electrically connected to the positive plate and the negative plate of the electrode body 460 via the current collector 450 .
  • the electrode terminal 420 is made of a conductive member such as metal such as aluminum, aluminum alloy, copper, copper alloy, or the like.
  • the current collector 450 is a conductive member (a positive electrode current collector and a negative electrode current collector) electrically connected to the electrode terminal 420 and the end portion 463 of the electrode body 460 .
  • the current collector 450 is made of aluminum, an aluminum alloy, copper, a copper alloy, or the like.
  • the gaskets 430 and 440 are plate-shaped electrically insulating sealing members arranged between the container cover 412 and the electrode terminal 420 and current collector 450 .
  • the gaskets 430 and 440 are made of, for example, any electrically insulating resin material that can be used for the second exterior body 120 .
  • FIG. 5 is a perspective view showing the configuration of the intermediate spacer 510 according to this embodiment.
  • FIG. 5(a) is an enlarged perspective view of the intermediate spacer 510 shown in FIG.
  • FIG. 5B is an enlarged view of the first end portions 514, 515 and second end portion 516 of the intermediate spacer 510 in FIG. 1 is a perspective view of a part shown in FIG.
  • FIG. 6A and 6B are a perspective view and a cross-sectional view showing the positional relationship between the first exterior body 110, the storage element 400, the end spacer 520, and the intermediate spacer 510 according to the present embodiment.
  • (a) of FIG. 6 is a perspective view showing the configuration in which the power storage element 400 , the intermediate spacer 510 and the end spacer 520 are placed on the first exterior body 110 .
  • FIG. 6(b) is a cross-sectional view of the configuration of FIG. 6(a) taken along a plane parallel to the YZ plane through the VIb--VIb line.
  • the intermediate spacer 510 includes a spacer body 511, a first wall portion 512, a second wall portion 513, first ends 514 and 515, a second end 516, and a projecting portion 517 .
  • the spacer main body 511 is a flat plate-like and rectangular portion that constitutes the main body of the intermediate spacer 510, and is arranged at a position facing the long side surface 411a of the container 410 of the power storage element 400 and abuts on the long side surface 411a.
  • the spacer main body 511 has a second groove portion 511a and a spacer convex portion 511b.
  • the second groove portion 511 a is a groove portion extending toward the second end portion 516 .
  • the second groove portion 511 a is formed at the end portion of the spacer body 511 in the negative Y-axis direction so as to extend in the X-axis direction, and is connected to the second end portion 516 . More specifically, the second groove portion 511a extends from one end to the other end in the X-axis direction along the edge of the spacer body 511 in the negative Y-axis direction. It is a recess recessed in the negative direction of the axis.
  • the second groove portion 511a extends from the Y-axis negative direction and X-axis positive direction end and the X-axis negative direction end of the spacer body 511 toward the second end portion 516 along the edge in the Y-axis negative direction. and is connected to the second end 516 .
  • the spacer convex portion 511b is arranged in the central portion of the spacer main body 511 in the X-axis direction and the Y-axis direction, and is a rectangular convex portion that protrudes in the Z-axis direction when viewed from above.
  • the spacer convex portion 511b is arranged to protrude toward the central portion of the long side surface 411a of the container 410 of the power storage element 400, and contacts and presses the central portion.
  • the spacer projections 511b are arranged on both sides of the spacer main body 511 in the Z-axis direction, and are arranged on both sides of the spacer main body 511 in the Z-axis direction. It protrudes toward and presses the central portion.
  • the first wall portion 512 is a flat and rectangular wall portion that protrudes upward (in the positive Z-axis direction) from the edges of the spacer body 511 in the positive direction of the X-axis, the negative direction of the X-axis, and the positive direction of the Y-axis. .
  • the first wall portion 512 is arranged to cover substantially half of the pair of short side surfaces 411b and the bottom surface 411c of the container 410 of the storage element 400 in the Z-axis direction.
  • the second wall portion 513 is a flat and rectangular wall portion that protrudes upward (in the positive Z-axis direction) from the end portion in the positive X-axis direction of the edge of the spacer body 511 in the negative Y-axis direction.
  • the second wall portion 513 is arranged to cover approximately half of the end portion of the container lid 412 of the power storage element 400 in the positive direction of the X axis in the Z axis direction.
  • the second wall portion 513 faces the wall surface between the gas discharge valve 412a of the storage element 400 in the container lid 412 and the electrode terminal 420 in the positive direction of the X axis. It is arranged so as to cover approximately half in the direction.
  • the first end portions 514 and 515 are plate-like and rectangular wall portions that protrude upward (in the positive Z-axis direction) from the end portion in the negative X-axis direction of the edge of the spacer body 511 in the negative Y-axis direction. .
  • the first ends 514 and 515 are arranged so as to cover approximately half in the Z-axis direction of the end in the negative X-axis direction of the container lid 412 of the power storage element 400 .
  • the first end portions 514 and 515 are opposed to the wall surface between the gas discharge valve 412a of the storage element 400 and the electrode terminal 420 in the negative direction of the X axis in the container lid 412. It is arranged so as to cover approximately half in the Z-axis direction.
  • a second end 516 is positioned between the first ends 514 and 515 .
  • the second end portion 516 is a concave portion that is recessed downward (Z-axis negative direction) from the first end portions 514 and 515 and has a lower height than the first end portions 514 and 515 .
  • the second end portion 516 is a rectangular concave portion when viewed from the Y-axis direction.
  • the first end portions 514 and 515 are wall portions adjacent to the second end portion 516 among the ends in the cross direction (Y-axis direction) crossing the vertical direction of the spacer body 511 .
  • the first end portion 514 is arranged in the X-axis plus direction of the second end portion 516
  • the first end portion 515 is arranged in the X-axis minus direction of the second end portion 516 .
  • the first ends 514 and 515 are a pair of walls located on either side of the second end 516 in the X-axis direction, the second end 516 being between the first ends 514 and 515 is a concave portion that is concave in the negative direction of the Z-axis.
  • the second end 516 is a space formed between the first ends 514 and 515 by the first ends 514 and 515 being spaced apart in the X-axis direction.
  • the protruding portion 517 is a portion that protrudes downward (Z-axis negative direction) from the second end portion 516 and guides the liquid passing through the second end portion 516 downward.
  • the protruding portion 517 is a guide portion that guides downward the liquid that passes through the second end portion 516 .
  • the liquid is, for example, an electrolytic solution that has leaked from the storage element 400 and accumulated on the spacer body 511 , or condensed water that has condensed on the spacer body 511 .
  • the protruding portion 517 is a plate-shaped rectangular portion that is arranged in the negative Z-axis direction of the second end portion 516 on the side surface of the spacer body 511 in the negative Y-axis direction and extends in the negative Z-axis direction.
  • the projecting portion 517 has a first groove portion 517a.
  • the first groove portion 517a is a groove portion in which the surface of the projecting portion 517 is recessed in the cross direction (Y-axis direction) and extends in the vertical direction (Z-axis direction).
  • the first groove portion 517a is a recess in which the X-axis direction central portion of the surface of the protruding portion 517 in the Y-axis negative direction is recessed in a rectangular shape in the Y-axis positive direction.
  • the first groove portion 517a is arranged to extend from one end edge to the other end edge of the projecting portion 517 in the Z-axis direction. is arranged at a position lower than adjacent portions in the X-axis direction.
  • the end of the first groove portion 517a in the Z-axis plus direction is connected to the second groove portion 511a.
  • the end portion of the first groove portion 517a in the positive Z-axis direction is located closer to the end surface of the spacer convex portion 511b in the positive Z-axis direction and the surface of the spacer main body 511 located around the spacer convex portion 511b in the positive Z-axis direction. It is arranged in the Z-axis minus direction.
  • the intermediate spacer 510 is arranged between the two power storage elements 400 in the Z-axis direction. As shown in FIG. 6, the intermediate spacer 510 is arranged below the power storage element 400 (power storage element 400a), and the other power storage element 400 (power storage element 400b) is placed below the intermediate spacer 510. As shown in FIG. Protruding portion 517 is arranged to protrude downward from other power storage element 400 (power storage element 400b).
  • the first exterior body 110 is formed with an exterior body convex portion 116 that protrudes upward from a main surface 110a that is a surface (upper surface) in the positive direction of the Z axis.
  • An end spacer 520 is positioned above.
  • Energy storage element 400b is arranged above end spacer 520
  • intermediate spacer 510 is arranged above energy storage element 400b.
  • Projecting portion 517 protrudes toward power storage element 400 b , and extends beyond power storage element 400 b and end spacer 520 to above major surface 110 a and below end spacer 520 .
  • the first groove portion 517a extends above the main surface 110a and below the storage element 400b and the end spacer 520. As shown in FIG.
  • the intermediate spacer 510 below the power storage element 400a has the adjacent second end portion in the cross direction crossing the vertical direction of the spacer main body 511 . It has a second end 516 that is lower in height than the ends 514 and 515 . Intermediate spacer 510 has a projection 517 projecting downwardly from second end 516 to guide downward liquid passing through second end 516 . In this way, by providing the intermediate spacer 510 with the protruding portion 517 that protrudes downward from the second end portion 516 , liquid such as electrolytic solution or condensed water accumulated in the intermediate spacer 510 is It can be guided downward from the portion 516 and discharged. As a result, it is possible to prevent the electric storage element 400a from being short-circuited with the lower conductive member (such as the electric storage element 400b) due to the liquid.
  • the lower conductive member such as the electric storage element 400b
  • the protruding part 517 has the first groove part 517a, so that the first groove part 517a serves as a flow path for the liquid, and the liquid tends to fall along the first groove part 517a. Therefore, when the liquid accumulated in the intermediate spacer 510 is discharged downward by the projecting portion 517, it can be easily guided downward and discharged.
  • the liquid By flowing the liquid into the first groove portion 517a, the liquid can be kept in the first groove portion 517a and the liquid can be prevented from falling from the second end portion 516. Since the spacer protrusions 511 b are provided on the spacer main body 511 , the liquid is stored in a position where the spacer protrusions 511 b of the spacer main body 511 are not provided, and the liquid falls from the second end 516 . can also be suppressed.
  • the end face (upper surface) of the spacer convex portion 511b in the positive Z-axis direction is arranged in the positive Z-axis direction relative to the end of the first groove portion 517a in the positive Z-axis direction.
  • the liquid contained in the spacer main body 511 where the spacer protrusions 511b are not provided overflows the liquid flows out of the first grooves 517a before reaching the upper surfaces of the spacer protrusions 511b. can be discharged. Thereby, it is possible to prevent the power storage element 400a above the intermediate spacer 510 from being immersed in the liquid.
  • the protruding portion 517 is arranged to protrude further downward than the power storage element 400b below the intermediate spacer 510, when the liquid accumulated in the intermediate spacer 510 is discharged downward by the protruding portion 517, the liquid is It is discharged below the element 400b. As a result, it is possible to prevent the electric storage element 400a from being short-circuited with the lower electric storage element 400b due to the liquid.
  • the electric storage element 400b is arranged at a position higher than the main surface 110a of the first exterior body 110 by the convex portion 116 of the exterior body, the liquid accumulates below the electric storage element 400b. Accordingly, even when the liquid accumulates on the first exterior body 110, it is possible to prevent the liquid from contacting the power storage element 400b.
  • the liquid accumulated in the intermediate spacer 510 falls from the first ends 514 and 515. , and is more likely to fall from the second end 516 . As a result, the liquid is prevented from falling from locations other than the protruding portion 517 and is easily discharged downward from the second end portion 516 by the protruding portion 517 .
  • the spacer main body 511 is provided with the second groove portion 511a extending toward the second end portion 516, the second groove portion 511a serves as a flow path for the liquid, and the liquid accumulated on the spacer main body 511 flows through the second end portion. 516 can be easily led to. Accordingly, the liquid can be easily discharged downward from the second end portion 516 by the projecting portion 517 .
  • the second exterior body 120 of the exterior body 100 is a bottomed rectangular tubular member having an opening formed in the negative direction of the Z axis
  • the first exterior body 110 is the second exterior body.
  • 120 is a flat rectangular member that closes the opening.
  • the first exterior body 110 is a bottomed rectangular cylindrical member with an opening formed in the positive direction of the Z axis
  • the second exterior body 120 is a flat rectangular shape that closes the opening of the first exterior body 110 . It may be a shaped lid or any other shape.
  • the first exterior body 110 is arranged in the negative Z-axis direction of the power storage element 400, and the restraining body 600 is arranged in the positive Z-axis direction of the power storage element 400 and joined to each other.
  • the first exterior body 110 may be arranged in the positive Z-axis direction of the power storage element 400, and the restraining body 600 may be arranged in the negative Z-axis direction of the power storage element 400 and joined together.
  • the power storage device 1 may have a configuration that is upside down.
  • Intermediate spacer 510 still has a protrusion 517 projecting downward from second end 516 that is lower in height than first ends 514 and 515 .
  • the restraining body 600 is attached to the first exterior body 110 to restrain the power storage element 400 .
  • restraining body 600 may not be attached to first exterior body 110 , and restraining body 600 may be attached to another member to restrain power storage element 400 .
  • the pair of wall portions of the first end portions 514 and 515 are arranged on both sides of the second end portion 516 .
  • the first end 514 or 515 may be arranged only on one side of the second end 516 .
  • the second end portion 516 is lower in height than the adjacent portions (first end portions 514 and 515) due to the downward depression of the end wall portion of the spacer body 511. I decided to However, the second end portion 516 only needs to be lower than the adjacent portion of the spacer body 511 , and the slope of the upper surface of the spacer body 511 allows the adjacent portion (first end portion) The height may be lower than .
  • the first groove portion 517a of the projecting portion 517 is a recess in which the central portion in the X-axis direction of the surface of the projecting portion 517 in the negative Y-axis direction is recessed in a rectangular shape.
  • the first groove portion 517a may be recessed in any shape other than a rectangular shape, and may be arranged at any position on the projecting portion 517.
  • the protruding portion 517 is a plate-like and rectangular portion in which the first groove portion 517a is formed.
  • the projecting portion 517 may have any shape such as a columnar shape or a cylindrical shape, and does not have to have the first groove portion 517a.
  • the projecting portion 517 extends below the storage element 400b and the end spacer 520.
  • the projecting portion 517 (and the first groove portion 517a) may not extend below the end spacer 520, and may not extend below the power storage element 400b.
  • a conductive member other than power storage element 400 may be arranged below intermediate spacer 510 .
  • the second groove portion 511a of the spacer main body 511 is a groove portion that extends in the X-axis direction toward the second end portion 516 along the edge of the spacer main body 511 in the negative Y-axis direction.
  • the second groove portion 511 a may be formed at any position of the spacer body 511 , such as a groove extending from the central portion of the spacer body 511 or the end portion in the X-axis direction toward the second end portion 516 .
  • the liquid can be accommodated in the first groove portion 517a and the liquid can be prevented from falling from the second end portion 516.
  • the spacer main body 511 has the rectangular spacer projections 511b when viewed from above, but the shape of the spacer projections 511b is not particularly limited.
  • the protruding region of the spacer protrusions 511b or increasing the amount of protrusion a large amount of liquid can be accommodated in the positions of the spacer main body 511 where the spacer protrusions 511b are not provided. Liquid can be prevented from falling from the second end 516 .
  • the spacer main body 511 is formed so that one or both of the second groove portion 511a and the spacer convex portion 511b can accommodate a larger amount of liquid than the total amount of the electrolyte contained in the power storage element 400 or the surplus amount of the electrolyte. may be
  • the spacer main body 511 may not have at least one of the second groove portion 511a and the spacer convex portion 511b.
  • any one of the intermediate spacers 510 may have a different configuration.
  • the end spacer 520 may also be configured to have a projecting portion or the like.
  • the power storage device 1 does not need to include all the components described above. Power storage device 1 may not include control unit 20, exterior body 100, first reinforcing member 200, restraint body 600, or the like.
  • the present invention can be realized not only as the power storage device 1 but also as the intermediate spacer 510 .
  • the present invention can be applied to a power storage device having a power storage element such as a lithium ion secondary battery.
  • power storage device 10 power storage unit 20 control unit 21, 22 external terminal 800, 810, 820, 830 bus bar 100 exterior body 110 first exterior body 110a main surface 116 exterior body convex portion 120 second exterior body 130 fixing member 400, 400a, 400b storage element 410 container 411 container body 411a long side 420 electrode terminal 500 spacer 510 intermediate spacer 511 spacer body 511a second groove 511b spacer projection 512 first wall 513 second wall 514, 515 first end 516 second End 517 Projection 517a First groove 520 End spacer 600 Restraint 900, 910, 920 Conductive member

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente divulgation concerne un dispositif de stockage d'énergie qui comprend : un élément de stockage d'énergie ; et un espaceur disposé au-dessous de l'élément de stockage d'énergie. L'espaceur comprend : un corps d'espacement ; et une section de projection qui fait saillie vers le bas à partir d'une deuxième section de bord, de sections de bord du corps d'espacement dans la direction d'intersection qui croise la direction verticale, la deuxième section de bord étant inférieure à une première section de bord adjacente à celle-ci.
PCT/JP2022/015747 2021-06-04 2022-03-30 Dispositif de stockage d'énergie WO2022254931A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131028U (fr) * 1974-08-29 1976-03-06
JP2014203750A (ja) * 2013-04-08 2014-10-27 株式会社Ｇｓユアサ 蓄電モジュール
JP2015050064A (ja) * 2013-09-02 2015-03-16 株式会社Ｇｓユアサ 蓄電装置
JP2018006348A (ja) * 2017-08-30 2018-01-11 株式会社Ｇｓユアサ 蓄電装置
WO2019123903A1 (fr) * 2017-12-19 2019-06-27 三洋電機株式会社 Dispositif d'alimentation électrique et séparateur de dispositif d'alimentation électrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5131028U (fr) * 1974-08-29 1976-03-06
JP2014203750A (ja) * 2013-04-08 2014-10-27 株式会社Ｇｓユアサ 蓄電モジュール
JP2015050064A (ja) * 2013-09-02 2015-03-16 株式会社Ｇｓユアサ 蓄電装置
JP2018006348A (ja) * 2017-08-30 2018-01-11 株式会社Ｇｓユアサ 蓄電装置
WO2019123903A1 (fr) * 2017-12-19 2019-06-27 三洋電機株式会社 Dispositif d'alimentation électrique et séparateur de dispositif d'alimentation électrique

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