WO2021039549A1 - 緩衝部材および蓄電モジュール - Google Patents
緩衝部材および蓄電モジュール Download PDFInfo
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- WO2021039549A1 WO2021039549A1 PCT/JP2020/031345 JP2020031345W WO2021039549A1 WO 2021039549 A1 WO2021039549 A1 WO 2021039549A1 JP 2020031345 W JP2020031345 W JP 2020031345W WO 2021039549 A1 WO2021039549 A1 WO 2021039549A1
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- WIPO (PCT)
- Prior art keywords
- power storage
- storage device
- cushioning member
- housing
- storage module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/258—Modular batteries; Casings provided with means for assembling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
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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
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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
- H01G11/78—Cases; Housings; Encapsulations; Mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/236—Hardness
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/238—Flexibility or foldability
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—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
- H01M50/293—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 the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
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- 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 disclosure relates to a buffer member and a power storage module.
- a power storage module in which a plurality of power storage devices (for example, batteries) are connected in series is known.
- a power storage module extends between a plurality of power storage devices, a plurality of separators arranged between adjacent power storage devices, a pair of end plates arranged at both ends in the arrangement direction of the power storage devices, and a pair of end plates. It is provided with a bind bar for restraining a plurality of power storage devices in the arrangement direction (see, for example, Patent Document 1).
- the power storage device expands due to various factors. In the conventional power storage module, this expansion is suppressed by the end plate and the bind bar. Further, in the power storage module, the power storage device is fixed by the binding force of the bind bar in order to maintain the electrical connection between the power storage devices and prevent the power storage device from popping out due to an impact from the outside.
- the present disclosure has been made in view of such a situation, and the purpose thereof is to provide a technique for enhancing the reliability of the power storage module.
- This power storage module includes at least one power storage device and a buffer member arranged in the first direction together with the power storage device and receiving a load from the power storage device in the first direction.
- the cushioning member has a soft portion and a hard portion located closer to the outer edge portion of the cushioning member than the soft portion, and the soft portion is more easily deformed than the hard portion.
- Another aspect of the present disclosure is a buffer member that is arranged in the first direction together with at least one power storage device and receives a load from the power storage device in the first direction.
- This cushioning member includes a soft portion and a hard portion located closer to the outer edge portion of the cushioning member than the soft portion, and the soft portion is more easily deformed than the hard portion.
- the reliability of the power storage module can be improved.
- FIG. 1 It is a perspective view of the power storage module which concerns on embodiment. It is an exploded perspective view of the power storage module. It is sectional drawing which shows typically how each power storage device expands. It is a perspective view of the cushioning member which concerns on Embodiment 1.
- FIG. 2 It is a front view of the shock absorbing member which is arranged in the 1st direction together with a power storage device. It is a perspective view of the cushioning member which concerns on Embodiment 2.
- FIG. It is a front view of the shock absorbing member which is arranged in the 1st direction together with a power storage device. It is a perspective view of the cushioning member which concerns on Embodiment 3.
- FIG. 10A is a perspective view of the cushioning member according to the first modification.
- FIG. 10B is a perspective view of the cushioning member according to the second modification.
- FIG. 1 is a perspective view of the power storage module according to the embodiment.
- FIG. 2 is an exploded perspective view of the power storage module.
- the illustration of the cushioning member 40 is simplified.
- the power storage module 1 includes a battery laminate 2, a pair of restraint members 6, and a cooling plate 8.
- the battery laminate 2 has a plurality of power storage devices 10, a plurality of separators 12, a plurality of buffer members 40, and a pair of end plates 4.
- Each power storage device 10 is, for example, a rechargeable secondary battery such as a lithium ion battery, a nickel-hydrogen battery, or a nickel-cadmium battery, or a capacitor such as an electric double layer capacitor.
- the power storage device 10 of the present embodiment is a so-called square battery, and has a flat rectangular parallelepiped housing 13.
- the housing 13 is composed of an outer can 14 and a sealing plate 16.
- the outer can 14 has a substantially rectangular opening on one surface, and the electrode body 38 (see FIG. 3) containing the positive electrode 38a, the negative electrode 38b, and the porous separator 38d, the electrolytic solution, and the like are placed in the outer can 14 through the opening. Be housed.
- the outer can 14 is covered with an insulating film (not shown) such as a shrink tube.
- an insulating film such as a shrink tube.
- the electrode body 38 has a structure in which a plurality of sheet-shaped positive electrodes 38a and a plurality of sheet-shaped negative electrodes 38b are alternately laminated via a porous separator 38d (see FIG. 3).
- the positive electrode 38a and the negative electrode 38b are aligned in the first direction X. Therefore, the electrodes located at both ends in the stacking direction face the long side surfaces of the housing 13, which will be described later.
- a band-shaped positive electrode and a band-shaped negative electrode are wound around via a porous separator, and a flat portion in which the positive electrode and the negative electrode spread flat and a bent portion in which the positive electrode and the negative electrode bend are formed.
- It may be a flat winding type electrode body having.
- the electrode body 38 is arranged so that the flat portion spreads in the direction intersecting (for example, orthogonal to) the first direction X. That is, they are arranged so that the thickness direction of the flat portion is parallel to the first direction X.
- the sealing plate 16 that is, the first surface 13a of the housing 13, is provided with an output terminal 18 electrically connected to the positive electrode 38a of the electrode body 38 near one end in the longitudinal direction, and the electrode body 38 is provided near the other end.
- An output terminal 18 that is electrically connected to the negative electrode 38b is provided.
- the output terminal 18 connected to the positive electrode 38a will be referred to as a positive electrode terminal 18a
- the output terminal 18 connected to the negative electrode 38b will be referred to as a negative electrode terminal 18b.
- the positive electrode terminal 18a and the negative electrode terminal 18b are collectively referred to as an output terminal 18.
- the outer can 14 and the sealing plate 16 are conductors, and are made of a metal such as aluminum, iron, or stainless steel.
- the sealing plate 16 and the outer can 14 are joined by, for example, laser, friction stir welding, brazing, or the like.
- the outer can 14 and the sealing plate 16 are made of an insulating resin.
- the outer can 14 has a bottom surface facing the sealing plate 16. Further, the outer can 14 has four side surfaces connecting the opening and the bottom surface. Two of the four sides are a pair of long sides connected to the two opposite long sides of the opening. Each long side surface is the surface having the largest area among the surfaces of the outer can 14, that is, the main surface. Further, each long side surface is a side surface extending in a direction intersecting (for example, orthogonal to) the first direction X. The remaining two sides, excluding the two long sides, are a pair of short sides connected to the opening of the outer can 14 and the short side of the bottom surface. The bottom surface, long side surface, and short side surface of the outer can 14 correspond to the bottom surface, long side surface, and short side surface of the housing 13, respectively.
- the first surface 13a of the housing 13 is used as the upper surface of the power storage device 10.
- the bottom surface of the housing 13 is the bottom surface of the power storage device 10
- the long side surface of the housing 13 is the long side surface of the power storage device 10
- the short side surface of the housing 13 is the short side surface of the power storage device 10.
- the surface on the upper surface side of the power storage device 10 is the upper surface of the power storage module 1
- the surface on the bottom surface side of the power storage device 10 is the bottom surface of the power storage module 1
- the surface on the short side surface of the power storage device 10 is power storage. It is the side surface of module 1.
- the upper surface side of the power storage module 1 is upward in the vertical direction, and the bottom surface side of the power storage module 1 is downward in the vertical direction. These directions and positions are defined for convenience. Therefore, for example, the portion defined as the upper surface in the present disclosure does not mean that the portion defined as the bottom surface is always located above the portion defined as the bottom surface. Therefore, the sealing plate 16 is not always located above the bottom surface of the outer can 14.
- a safety valve (not shown) is provided between the pair of output terminals 18 on the sealing plate 16.
- the safety valve is configured so that it can be opened when the internal pressure of the housing 13 rises above a predetermined value to release the gas inside the housing 13.
- the safety valve is composed of, for example, a thin-walled portion provided on a part of the sealing plate 16 and thinner than the other portion, and a linear groove formed on the surface of the thin-walled portion. In this configuration, when the internal pressure of the housing 13 rises, the thin-walled portion is torn from the groove to open the safety valve.
- the plurality of power storage devices 10 are arranged side by side at predetermined intervals so that the long side surfaces of adjacent power storage devices 10 face each other.
- the direction in which the plurality of power storage devices 10 are lined up is defined as the first direction X.
- the output terminals 18 of each power storage device 10 are arranged so as to face each other in the same direction.
- the output terminals 18 of each power storage device 10 are arranged so as to face upward in the vertical direction for convenience.
- the output terminals 18 of each power storage device 10 may be arranged so as to face different directions.
- the two adjacent power storage devices 10 are arranged (stacked) so that the positive electrode terminal 18a of one power storage device 10 and the negative electrode terminal 18b of the other power storage device 10 are adjacent to each other.
- the positive electrode terminal 18a and the negative electrode terminal 18b are connected in series via a bus bar (not shown).
- output terminals 18 having the same polarity in a plurality of adjacent power storage devices 10 may be connected in parallel by a bus bar to form a power storage device block, and the power storage device blocks may be connected in series.
- the separator 12 also called an insulating spacer, is arranged between two adjacent power storage devices 10 and electrically insulates the two power storage devices 10.
- the separator 12 is made of, for example, a resin having an insulating property.
- the resin constituting the separator 12 include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polycarbonate (PC), and Noryl (registered trademark) resin (modified PPE).
- PP polypropylene
- PBT polybutylene terephthalate
- PC polycarbonate
- Noryl resin modified PPE
- the separator 12 has a flat surface portion 20 and a wall portion 22.
- the flat surface portion 20 is interposed between the long side surfaces of the two adjacent power storage devices 10 that face each other. As a result, the outer cans 14 of the adjacent power storage devices 10 are more reliably insulated from each other.
- the wall portion 22 extends from the outer edge portion of the flat surface portion 20 in the first direction X where the power storage devices 10 are lined up, and covers a part of the upper surface, side surfaces, and a part of the bottom surface of the power storage device 10. As a result, it is possible to secure a creepage distance between adjacent power storage devices 10 or between the power storage devices 10 and the end plate 4. Further, the outer can 14 of the power storage device 10 and the restraint member 6 are more reliably insulated. Further, the position of the power storage device 10 in the second direction Y where the output terminals 18 are lined up and in the third direction Z where the upper surface and the bottom surface of the power storage device 10 are lined up can be regulated or fixed.
- the first direction X, the second direction Y, and the third direction Z are directions orthogonal to each other.
- the wall portion 22 has a notch 24 so that the bottom surface of the power storage device 10 is exposed.
- the notch 24 it is possible to prevent the separator 12 from obstructing the thermal connection between the power storage device 10 and the cooling plate 8.
- the separator 12 has urging receiving portions 26 facing upward at both ends in the second direction Y.
- the buffer member 40 is arranged in the first direction X together with the plurality of power storage devices 10.
- the cushioning member 40 has a sheet shape, and is interposed between the long side surface of each power storage device 10 and the flat surface portion 20 of each separator 12, for example.
- the number of buffer members 40 arranged between two adjacent power storage devices 10 may be one or a plurality.
- the cushioning member 40 can be fixed to the surface of the flat surface portion 20 by adhesion or the like.
- the flat surface portion 20 may be provided with a recess, and the cushioning member 40 may be fitted into the recess.
- the cushioning member 40 and the separator 12 may be integrally molded.
- the cushioning member 40 may also serve as the flat surface portion 20. The structure and operation of the cushioning member 40 will be described in detail later.
- a plurality of power storage devices 10, a plurality of separators 12, and a plurality of buffer members 40 arranged side by side are sandwiched by a pair of end plates 4 in the first direction X.
- Separators 12 are arranged between the pair of end plates 4 and the power storage devices 10 arranged at both ends in the first direction X.
- the end plate 4 is made of, for example, a metal plate or a resin plate.
- the end plate 4 is provided with a screw hole 4a through which the end plate 4 is penetrated in the first direction X and the screw 28 is screwed.
- the pair of restraint members 6 are also called bind bars, and are elongated members having the first direction X as the longitudinal direction.
- the pair of restraint members 6 are arranged so as to face each other in the second direction Y.
- a battery laminate 2 is interposed between the pair of restraint members 6.
- Each restraint member 6 includes a main body portion 30, a support portion 32, a plurality of urging portions 34, and a pair of fixing portions 36.
- the main body portion 30 is a rectangular portion extending in the first direction X.
- the main body 30 extends parallel to the side surface of each power storage device 10.
- the support portion 32 extends in the first direction X and projects in the second direction Y from the lower end of the main body portion 30.
- the support portion 32 is a plate-like body continuous in the first direction X, and supports the battery laminate 2.
- the plurality of urging portions 34 are connected to the upper ends of the main body portion 30 and project in the second direction Y.
- the support portion 32 and each urging portion 34 face each other in the third direction Z. Further, the plurality of urging portions 34 are arranged in the first direction X at predetermined intervals.
- Each urging unit 34 is arranged corresponding to each power storage device 10.
- Each urging portion 34 has a leaf spring shape, and urges each power storage device 10 toward the support portion 32.
- the pair of fixing portions 36 are plate-like bodies protruding in the second direction Y from both ends of the main body portion 30 in the first direction X.
- the pair of fixing portions 36 face each other in the first direction X.
- Each fixing portion 36 is provided with a through hole 36a through which a screw 28 is inserted.
- the restraint member 6 is fixed to the battery laminate 2 by the pair of fixing portions 36.
- the cooling plate 8 is a mechanism for cooling a plurality of power storage devices 10.
- the cooling plate 8 is made of a material having thermal conductivity such as metal.
- the battery laminate 2 is placed on the main surface of the cooling plate 8 in a state of being restrained by the pair of restraining members 6, and screws or the like are fastened to the through hole 32a of the support portion 32 and the through hole 8a of the cooling plate 8. By inserting a member (not shown), it is fixed to the cooling plate 8.
- Each power storage device 10 is cooled by exchanging heat with the cooling plate 8.
- the cooling plate 8 may be provided with a refrigerant pipe (not shown) through which the refrigerant flows.
- the power storage module 1 is assembled as follows, for example. That is, the plurality of power storage devices 10, the plurality of buffer members 40, and the plurality of separators 12 are repeatedly arranged in this order and sandwiched between the pair of end plates 4 in the first direction X to form the battery laminate 2. ..
- the battery laminate 2 is sandwiched between a pair of restraint members 6 in the second direction Y. Each restraint member 6 is aligned so that the through hole 36a overlaps with the screw hole 4a of the end plate 4. In this state, the screw 28 is inserted into the through hole 36a and screwed into the screw hole 4a. By engaging the pair of restraint members 6 with the pair of end plates 4 in this way, the plurality of power storage devices 10 are restrained.
- the battery laminate 2 is fastened by the restraint member 6 in a state where a predetermined pressure is applied in the first direction X.
- Each power storage device 10 is tightened in the first direction X by the restraint member 6, so that the first direction X is positioned. Further, the bottom surface of each power storage device 10 is supported by the support portion 32. A wall portion 22 of the separator 12 is interposed between the bottom surface of each power storage device 10 and the support portion 32. Further, the urging unit 34 comes into contact with the urging receiving unit 26 corresponding to each power storage device 10. Each urging unit 34 urges each power storage device 10 toward the support unit 32 via the urging receiving unit 26. That is, each power storage device 10 is sandwiched in the third direction Z by the support portion 32 and the plurality of urging portions 34. As a result, each power storage device 10 is positioned in the third direction Z.
- a bus bar is attached to the output terminals 18 of each power storage device 10, and the output terminals 18 of the plurality of power storage devices 10 are electrically connected to each other.
- the bus bar is fixed to the output terminal 18 by welding.
- the upper surface of the battery laminate 2 is covered with a cover member (not shown).
- the cover member prevents contact of condensed water, dust, etc. with the output terminal 18, the bus bar, the safety valve, and the like of the power storage device 10.
- the cover member is made of, for example, an insulating resin, and can be fixed to the upper surface of the battery laminate 2 by a well-known fixing structure (not shown) including screws and a well-known locking mechanism.
- the battery laminate 2 to which the restraint member 6 and the cover member are attached is placed on the cooling plate 8 and fixed to the cooling plate 8 by inserting the fastening member through the through hole 8a and the through hole 32a.
- the power storage module 1 is obtained.
- the battery laminate 2 and the cooling plate 8 may be fixed together by the restraint member 6 to manufacture the power storage module 1.
- the cooling plate 8 is arranged inside the pair of restraint members 6.
- FIG. 3 is a cross-sectional view schematically showing how each power storage device 10 expands.
- the number of power storage devices 10 is thinned out. Further, the internal structure of the power storage device 10 and the separator 12 are simplified, and the shock absorber 40 is omitted.
- the electrode body 38 is housed inside each power storage device 10.
- the outer can 14 repeatedly expands and contracts with charging and discharging. The expansion of the outer can 14 is mainly caused by the expansion of the electrode body 38.
- a load G1 toward the outside of the first direction X is generated in the battery laminate 2.
- a load G2 corresponding to the load G1 is applied to the battery laminate 2 by the restraint member 6. As a result, the expansion of each power storage device 10 is suppressed.
- a load is applied to the restraint member 6 when the power storage device 10 expands.
- the load applied to the restraint member 6 also increases. If the load applied to the restraint member 6 becomes excessive, the restraint member 6 may be damaged. If an attempt is made to increase the strength of the restraint member 6 in order to prevent damage, the restraint member 6 and thus the power storage module 1 may be increased in size and cost.
- the electrode body 38 (particularly the porous separator 38d) is excessively pressed, which may lead to deterioration of the performance of the power storage device 10 and shortening of the life.
- the restraint of the power storage device 10 by the restraint member 6 is loosened, the load applied to the restraint member 6 can be reduced. However, for positioning in the power storage module 1, it is necessary to apply a certain load to each power storage device 10. Therefore, the restraint of the power storage device 10 cannot be simply loosened.
- the power storage module 1 includes a buffer member 40.
- FIG. 4 is a perspective view of the cushioning member 40 according to the first embodiment.
- FIG. 5 is a front view of the cushioning member 40 in a state of being arranged in the first direction X together with the power storage device 10. Note that in FIG. 5, the separator 12 is not shown.
- the buffer member 40 is a member that is arranged together with the power storage device 10 and receives a load from the power storage device 10 in the first direction X.
- the cushioning member 40 has a hard portion 42 having a predetermined degree of deformation and a soft portion 44 that is more easily deformed than the hard portion 42.
- the hard portion 42 is located closer to the outer edge portion of the cushioning member 40 than the soft portion 44.
- the outer edge portion of the cushioning member 40 is, for example, a region of the cushioning member 40 including the end portion in the second direction Y.
- the cushioning member 40 of the present embodiment has a structure in which hard portions 42 are arranged on both ends in the second direction Y and soft portions 44 are arranged between the two hard portions 42.
- the soft portion 44 is arranged so as to overlap the center 13C of the long side surface of the housing 13 when viewed from the first direction X.
- the center 13C of the long side surface of the housing 13 is, for example, the geometric center of the outer shape of the housing 13 as viewed from the first direction X.
- the soft portion 44 is arranged so as to overlap the center 38C of the electrode body 38 when viewed from the first direction X.
- the center 38C of the electrode body 38 is, for example, the geometric center of the outer shape of the electrode body 38 as seen from the first direction X.
- the hard portion 42 is arranged so as to overlap at least a part of the outer edge portion 13E on the long side surface of the housing 13 when viewed from the first direction X.
- the outer edge portion 13E of the long side surface of the housing 13 is, for example, from the end portion 13b of the housing 13 in the second direction Y, that is, the tangent line between the short side surface and the long side surface of the housing 13, of the output terminal 18 in the second direction Y.
- the outer edge portion 13E may be a region from the end portion 13b to the outer end portion of the output terminal 18 in the second direction Y.
- the expansion of the power storage device 10 is mainly caused by the expansion of the electrode body 38. Further, the electrode body 38 expands more toward the center 38C. Therefore, when the power storage device 10 expands, the portion closer to the center 13C of the long side surface of the housing 13 or the portion closer to the center 38C of the electrode body 38 is displaced more in the first direction X, and the outer edge of the long side surface of the housing 13 is displaced. The portion closer to the portion 13E is displaced smaller.
- the cushioning member 40 has a soft portion 44 that is more easily deformed than the hard portion 42, and a hard portion 42 that is less deformable than the soft portion 44 and is located on the outer edge portion side of the cushioning member 40.
- the cushioning member 40 is arranged with respect to the power storage device 10 so that the soft portion 44 receives the large load generated by the large displacement of the power storage device 10 and the hard portion 42 receives the small load generated by the small displacement of the power storage device 10. can do.
- the buffer member 40 has a recess 46 recessed in a direction away from the power storage device 10. That is, the recess 46 is recessed in the first direction X. A part of the non-recessed portion of the buffer member 40 that is adjacent to the recess 46 and is in contact with the power storage device 10 can be partially displaced toward the recess 46 when compressed by receiving a force from the power storage device 10. That is, a part of the non-recessed portion can escape into the recess 46. Therefore, by providing the recess 46, the non-recessed portion can be easily deformed. In particular, in the first direction X, the non-recessed portion can be easily deformed. In other words, even when the entire cushioning member 40 is made of the same material, the apparent elastic modulus of the non-recessed portion can be reduced by providing the recess 46.
- the ratio of the area of the recess 46 to the area of the soft portion 44 is made larger than the ratio of the area of the recess 46 to the area of the hard portion 42 when viewed from the first direction X. You may.
- the area of the non-recessed portion in the soft portion 44 may be smaller than the area of the non-recessed portion in the hard portion 42.
- the recess 46 is provided only in the soft portion 44. By arranging more recesses 46 in the soft portion 44 than in the hard portion 42, the soft portion 44 can be more easily deformed than in the hard portion 42. As long as the deformability of the hard portion 42 does not exceed the deformability of the soft portion 44, the concave portion 46 may be provided in the hard portion 42.
- the recess 46 includes a core portion 46a and a plurality of wire portions 46b.
- the core portion 46a is circular and is arranged at the center of the cushioning member 40 when viewed from the first direction X. Further, the core portion 46a of the present embodiment overlaps the center 13C of the long side surface of the housing 13 and the center 38C of the electrode body 38 when viewed from the first direction X.
- the plurality of wire portions 46b radiate from the core portion 46a. Since the wire portion 46b spreads radially, the closer to the core portion 46a, the higher the proportion of the wire portion 46b, and the smaller the number of non-recessed portions. Therefore, the region closer to the core portion 46a is more likely to be deformed in the non-recessed portion.
- the deformability of the cushioning member 40 can be efficiently changed with a smaller number of wire portions 46b. Therefore, the soft portion 44 and the hard portion 42 can be formed by easier processing. Further, the line width of each line portion 46b becomes thicker toward the outside of the radiation. Further, the plurality of wire portions 46b are connected to each other via the core portion 46a. The line portion 46b may extend along the second direction Y or the third direction Z. Further, the plurality of line portions 46b may be arranged in a state of being separated from each other.
- the material constituting the cushioning member 40 examples include thermocurable elastomers such as natural rubber, synthetic rubber, urethane rubber, silicone rubber, and fluororubber, and thermoplastic elastomers such as polystyrene, olefin, polyurethane, polyester, and polyamide. Will be done. In addition, these materials may be foamed. Further, a heat insulating material on which a porous material such as silica xerogel is supported is also exemplified.
- the buffer member 40 of the present embodiment has an insulating property, and is provided on a separator 12 that insulates the power storage device 10 and the outside (for example, the adjacent power storage device 10, the end plate 4, the restraint member 6, etc.). It constitutes a part of the separator 12.
- the power storage module 1 is arranged together with at least one power storage device 10 and the power storage device 10 in the first direction X, and receives a load from the power storage device 10 in the first direction X.
- a member 40 is provided.
- the cushioning member 40 has a soft portion 44 and a hard portion 42 located closer to the outer edge portion of the cushioning member 40 than the soft portion 44, and the soft portion 44 is more easily deformed than the hard portion 42.
- the hard portion 42 presses the portion of the power storage device 10 where the expansion is small to position the power storage device 10, while the soft portion 44 absorbs a large load from the power storage device 10 to reduce the load applied to the restraint member 6.
- the arrangement design of the cushioning member 40 becomes possible. That is, in the plane of the shock absorber 40, the deformability of the shock absorber 40 can be made different according to the expansion shape of the power storage device 10. Therefore, according to the present embodiment, even if the expansion amount of the power storage device 10 increases as the capacity of the power storage device 10 increases, the expansion of the power storage device 10 is more reliably absorbed while positioning the power storage device 10. Therefore, the load applied to the restraint member 6 can be reduced. Therefore, it is possible to suppress damage to the restraint member 6 and position the power storage device 10 at the same time. As a result, the reliability of the power storage module 1 can be improved.
- the expansion amount of the power storage device 10 increases with the lapse of the usage period. That is, the expansion amount of the power storage device 10 changes between the initial stage of life and the end of life.
- the binding force of the battery laminate 2 by the restraint member 6 is set according to the small expansion of the power storage device 10 at the initial stage of life, whereby the power storage device 10 is positioned more reliably.
- the large expansion of the power storage device 10 at the end of its life is absorbed by the soft portion 44, whereby the load applied to the restraint member 6 can be reduced. Therefore, even if the expansion amount of the power storage device 10 changes between the initial stage of life and the end of life, the power storage device 10 can be held with an appropriate binding force according to the expansion amount of each stage.
- the soft portion 44 of the present embodiment is arranged so as to overlap the center 13C of the long side surface of the housing 13 and to overlap the center 38C of the electrode body 38 when viewed from the first direction X.
- the hard portion 42 is arranged so as to overlap at least a part of the outer edge portion 13E on the long side surface of the housing 13 when viewed from the first direction X.
- the center 13C of the long side surface of the housing 13 and the center 38C of the electrode body 38 are portions having a large displacement amount due to expansion, and the outer edge portion 13E of the long side surface of the housing 13 is a portion having a small displacement amount due to expansion. is there. Therefore, by arranging the soft portion 44 and the hard portion 42 as described above, it is possible to more reliably suppress the damage of the restraint member 6 and position the power storage device 10.
- the cushioning member 40 has a recess 46 recessed in a direction away from the power storage device 10, and the ratio of the area of the recess 46 to the area of the soft portion 44 when viewed from the first direction X is the area of the hard portion 42. It is larger than the ratio of the area of the recess 46 to occupy. As a result, it is possible to achieve both suppression of damage to the restraint member 6 and positioning of the power storage device 10 with a simple configuration.
- the recess 46 includes a plurality of line portions 46b extending radially.
- each line portion 46b becomes thicker toward the outside of the radiation.
- the peripheral portion of the soft portion 44 can be more reliably deformed.
- the recess 46 more specifically, the wire portion 46b extends to the outer edge portion of the cushioning member 40 in the third direction Z. Then, at the outer edge of the cushioning member 40, the end of the recess 46 is open. As a result, when the non-recessed portion is compressed and a part of the recess is displaced toward the recess 46, the air inside the recess 46 can be easily discharged to the outside of the recess 46. Therefore, the non-recessed portion can be more easily deformed than the case where the opening of the recess 46 is closed by the power storage device 10.
- a part of the wire portion 46b may be located outside the swelling region of the power storage device 10 when viewed from the first direction X (see FIG. 9).
- the "bulging region" may be, for example, the entire long side surface of the housing 13, or may be a region smaller than the entire long side surface. When the entire long side surface swells, the cushioning member 40 may be larger than the long side surface. This structure also makes it easier for the air in the recess 46 to escape, and makes it easier for the non-recessed portion to be deformed.
- the depth of the recess 46 (dimension of the first direction X) may be changed according to the expansion shape of the power storage device 10. For example, the recess 46 may be deeper as it is closer to the center of the cushioning member 40.
- the cushioning member 40 of the present embodiment has an insulating property and is provided on a separator 12 that insulates the power storage device 10 from the outside, and constitutes a part of the separator 12. As a result, the cushioning member 40 can be easily installed. Further, it is possible to suppress an increase in the number of parts of the power storage module 1 due to the provision of the buffer member 40.
- FIG. 6 is a perspective view of the cushioning member 40 according to the second embodiment.
- FIG. 7 is a front view of the cushioning member 40 in a state of being arranged in the first direction X together with the power storage device 10. Note that in FIG. 7, the separator 12 is not shown.
- the cushioning member 40 includes a soft portion 44 having a predetermined degree of deformation and a hard portion 42 located closer to the outer edge portion of the cushioning member 40 than the soft portion 44 and less easily deformed than the soft portion 44.
- the soft portion 44 is arranged so as to overlap the center 13C of the long side surface of the housing 13 when viewed from the first direction X. Further, the soft portion 44 is arranged so as to overlap the center 38C of the electrode body 38 when viewed from the first direction X.
- the hard portion 42 is arranged so as to overlap at least a part of the outer edge portion 13E on the long side surface of the housing 13 when viewed from the first direction X.
- the cushioning member 40 has a through hole 48 penetrating the cushioning member 40 in the first direction X.
- the ratio of the area of the through hole 48 to the area of the soft portion 44 is larger than the ratio of the area of the through hole 48 to the area of the hard portion 42.
- the through hole 48 is provided only in the soft portion 44.
- the soft portion 44 has a high soft portion 44a that is easily deformed because the area occupied by the through hole 48 is relatively large, and a low soft portion 44b that is difficult to be deformed because the area occupied by the through hole 48 is relatively small.
- the highly soft portion 44a is arranged in the center of the cushioning member 40 in the second direction Y, and overlaps the center 13C of the long side surface of the housing 13 and the center 38C of the electrode body 38.
- the low soft portion 44b is arranged on both outer sides of the high soft portion 44a in the second direction Y. Therefore, each low soft portion 44b is interposed between the high soft portion 44a and the hard portion 42.
- the center 13C of the long side surface of the housing 13 or the center 38C of the electrode body 38 becomes the outer edge portion 13E of the long side surface of the housing 13.
- the displacement of the soft portion 44 can be made to follow with higher accuracy with respect to the expansion of the power storage device 10 that gradually decreases toward it. As a result, it is possible to suppress damage to the restraint member 6 and position the power storage device 10 at the same time.
- the cushioning member 40 has a plurality of through holes 48.
- the plurality of through holes 48 are arranged so as to radiate from the center of the cushioning member 40 when viewed from the first direction X.
- the displacement of the soft portion 44 can be made to follow the expansion of the power storage device 10 with higher accuracy. Therefore, it is possible to suppress damage to the restraint member 6 and position the power storage device 10 at the same time.
- a through hole 48 having a diameter larger than that of the other through holes 48 is provided at the center of the buffer member 40. As a result, the load received from the most expanding portion of the housing 13 can be more reliably absorbed.
- the shape of the through hole 48 seen from the first direction X is circular, but this is not the case.
- Each through hole 48 may have a polygonal shape such as a rectangular shape, a straight line shape, a curved shape, or the like when viewed from the first direction X.
- FIG. 8 is a perspective view of the cushioning member 40 according to the third embodiment.
- FIG. 9 is a front view of the cushioning member 40 in a state of being arranged in the first direction X together with the power storage device 10. Note that in FIG. 9, the separator 12 is not shown.
- the cushioning member 40 includes a soft portion 44 having a predetermined degree of deformation and a hard portion 42 located closer to the outer edge portion of the cushioning member 40 than the soft portion 44 and less easily deformed than the soft portion 44.
- the soft portion 44 is arranged so as to overlap the center 13C of the long side surface of the housing 13 when viewed from the first direction X. Further, the soft portion 44 is arranged so as to overlap the center 38C of the electrode body 38 when viewed from the first direction X.
- the hard portion 42 is arranged so as to overlap at least a part of the outer edge portion 13E on the long side surface of the housing 13 when viewed from the first direction X.
- the buffer member 40 has a plurality of convex portions 50 projecting toward the power storage device 10. That is, each convex portion 50 protrudes / BR> O in the first direction X.
- the deformability of the cushioning member 40 is lower in the portion where the convex portion 50 is provided than in the portion where the convex portion 50 is not provided. Further, the cushioning member 40 receives a load from the power storage device 10 on the top surface of each convex portion 50.
- the ratio of the area of the convex portion 50 to the area of the soft portion 44 is larger than the ratio of the area of the convex portion 50 to the area of the hard portion 42 when viewed from the first direction X. It may be made smaller. In other words, the area of the non-convex portion formed in the soft portion 44 may be larger than the area of the non-convex portion formed in the hard portion 42.
- the area of the convex portion 50 is, for example, the area of the top surface of the convex portion 50 extending in the in-plane direction of the YZ plane orthogonal to the first direction X when the cushioning member 40 is not loaded.
- the convex portion 50 By arranging the convex portion 50 less than the soft portion 44 as compared with the hard portion 42, a part of the convex portion 50 is easily displaced to the non-convex portion forming portion when the convex portion 50 is compressed, so that the hard portion 42 The soft portion 44 can be easily deformed. Therefore, even if the convex portion 50 is provided instead of the concave portion 46, the same effect as that of the first embodiment can be obtained.
- the soft portion 44 has a high soft portion 44a that is easily deformed because the area occupied by the convex portion 50 is relatively small, and a low soft portion 44b that is difficult to be deformed because the area occupied by the convex portion 50 is relatively large.
- the highly soft portion 44a is arranged in the center of the cushioning member 40 in the second direction Y, and overlaps the center 13C of the long side surface of the housing 13 and the center 38C of the electrode body 38.
- the low soft portion 44b is arranged on both outer sides of the high soft portion 44a in the second direction Y. Therefore, each low soft portion 44b is interposed between the high soft portion 44a and the hard portion 42.
- the center 13C of the long side surface of the housing 13 or the center 38C of the electrode body 38 becomes the outer edge portion 13E of the long side surface of the housing 13.
- the displacement of the soft portion 44 can be made to follow with higher accuracy with respect to the expansion of the power storage device 10 that gradually decreases toward it. As a result, it is possible to suppress damage to the restraint member 6 and position the power storage device 10 at the same time.
- the cushioning member 40 has a plurality of convex portions 50.
- the plurality of convex portions 50 are arranged so as to radiate from the center of the cushioning member 40 when viewed from the first direction X. Further, the area of the plurality of convex portions 50 becomes larger toward the outside of the radiation. Therefore, the cushioning member 40 is less likely to be gradually deformed linearly or stepwise from the highly soft portion 44a to the hard portion 42. As a result, the displacement of the soft portion 44 can be made to follow the expansion of the power storage device 10 with higher accuracy. Therefore, it is possible to suppress damage to the restraint member 6 and position the power storage device 10 at the same time. Further, a recess is provided in the center of the cushioning member 40 when viewed from the first direction X. As a result, the load received from the most expanding portion of the housing 13 can be more reliably absorbed.
- the shape of the convex portion 50 when viewed from the first direction X is rectangular, but this is not the case.
- the convex portion 50 may have a polygonal shape other than a rectangular shape, a circular shape, a linear shape, a curved shape, or the like when viewed from the first direction X.
- the portion sandwiched between the two adjacent wire portions 46b corresponds to the convex portion 50 extending linearly, and the hard portion 42 having no concave portion 46 as a whole is 1. It can also be interpreted as corresponding to one convex portion 50.
- the height of the convex portion 50 (dimension of the first direction X) may be changed according to the expansion shape of the power storage device 10. For example, the convex portion 50 may be lowered as it is closer to the center of the cushioning member 40.
- FIG. 10A is a perspective view of the cushioning member 40 according to the first modification.
- FIG. 10B is a perspective view of the cushioning member 40 according to the second modification.
- the plurality of convex portions 50 are arranged so that the distance between the adjacent convex portions 50 gradually narrows from the central portion to the outer edge portion of the cushioning member 40. As a result, the convex portions 50 are arranged closer to the outer edge portion of the cushioning member 40.
- the size of each convex portion 50 changes according to the distance from the central portion of the cushioning member 40.
- the sizes of the convex portions 50 are equal.
- a plurality of linear recesses 46 are arranged in a grid pattern, and the widths of the recesses 46 located outside the cushioning member 40 in the two recesses 46 extending adjacent to each other in parallel with each other. Can be regarded as a structure narrower than the width of the recess 46 located inside.
- the cushioning member 40 in which the hard portions 42 are arranged at both ends in the longitudinal direction (second direction Y) of the long side surface of the housing 13 has been described.
- the cushioning member 40 is not limited to the above configuration.
- the hard portion 42 may be arranged in an annular shape so as to surround the entire circumference of the soft portion 44.
- the buffer member 40 may be provided for all combinations of two adjacent power storage devices 10, or may be provided for some combinations. Further, in addition to being provided between the two power storage devices 10, the buffer member 40 may also be provided between the power storage device 10 and the end plate 4. Further, the buffer member 40 may be provided only between the power storage device 10 and the end plate 4.
- the number of power storage devices 10 included in the power storage module 1 is not particularly limited, and the power storage module 1 may have at least one power storage device 10.
- the structure of each part of the power storage module 1 including the structure of the end plate 4 and the restraint member 6 is not particularly limited.
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Abstract
Description
図1は、実施の形態に係る蓄電モジュールの斜視図である。図2は、蓄電モジュールの分解斜視図である。図2では、緩衝部材40の図示を簡略化している。蓄電モジュール1は、一例として電池積層体2と、一対の拘束部材6と、冷却板8と、を備える。電池積層体2は、複数の蓄電装置10と、複数のセパレータ12と、複数の緩衝部材40と、一対のエンドプレート4と、を有する。
実施の形態2は、緩衝部材40の形状を除き、実施の形態1と共通の構成を有する。以下、本実施の形態について実施の形態1と異なる構成を中心に説明し、共通する構成については簡単に説明するか、あるいは説明を省略する。図6は、実施の形態2に係る緩衝部材40の斜視図である。図7は、蓄電装置10とともに第1方向Xに配列された状態にある緩衝部材40の正面図である。なお、図7では、セパレータ12の図示を省略している。
実施の形態3は、緩衝部材40の形状を除き、実施の形態1と共通の構成を有する。以下、本実施の形態について実施の形態1と異なる構成を中心に説明し、共通する構成については簡単に説明するか、あるいは説明を省略する。図8は、実施の形態3に係る緩衝部材40の斜視図である。図9は、蓄電装置10とともに第1方向Xに配列された状態にある緩衝部材40の正面図である。なお、図9では、セパレータ12の図示を省略している。
凸部50の配置には、以下のような変形例1,2を挙げることができる。図10(A)は、変形例1に係る緩衝部材40の斜視図である。図10(B)は、変形例2に係る緩衝部材40の斜視図である。変形例1,2において、複数の凸部50は、緩衝部材40の中央部から外縁部に向かって、隣り合う凸部50の間隔が徐々に狭まるように配置される。これにより、緩衝部材40の外縁部に近いほど凸部50が密に配置される。また、変形例1では、各凸部50の大きさが緩衝部材40の中央部からの距離に応じて変化している。変形例2では、各凸部50の大きさは均等である。
実施の形態では、筐体13の長側面の長手方向(第2方向Y)における両端に硬質部42が配置される緩衝部材40を説明した。しかしながら、緩衝部材40は、上記の構成に限定されない。例えば、硬質部42は、軟質部44の全周を囲うように環状に配置されてもよい。
緩衝部材40は、隣り合う2つの蓄電装置10の組み合わせの全てに対して設けられてもよいし、一部の組み合わせに対して設けられてもよい。また、緩衝部材40は、2つの蓄電装置10の間に設けられることに加えて、蓄電装置10とエンドプレート4との間にも設けられてもよい。さらに、緩衝部材40は、蓄電装置10とエンドプレート4との間のみに設けられてもよい。
蓄電モジュール1が備える蓄電装置10の数は特に限定されず、蓄電モジュール1は蓄電装置10を少なくとも1つ有していればよい。エンドプレート4や拘束部材6の構造を含む蓄電モジュール1の各部の構造は、特に限定されない。
Claims (13)
- 少なくとも1つの蓄電装置と、
前記蓄電装置とともに第1方向に配列されて、前記蓄電装置から第1方向に荷重を受ける緩衝部材と、を備え、
前記緩衝部材は、
軟質部と、
前記軟質部よりも前記緩衝部材の外縁部側に位置する硬質部と、を有し、
前記軟質部は、前記硬質部よりも変形しやすい、
蓄電モジュール。 - 前記蓄電装置は、筐体と、前記筐体の第1面に配置される一対の出力端子と、前記筐体に収容される電極体と、を有し、
前記筐体は、前記第1方向と交わる方向に広がる側面を有し、
前記軟質部は、前記第1方向から見て前記側面の中心と重なるように配置され、
前記硬質部は、前記第1方向から見て前記側面の外縁部の少なくとも一部と重なるように配置される、
請求項1に記載の蓄電モジュール。 - 前記蓄電装置は、筐体と、前記筐体の第1面に配置される一対の出力端子と、前記筐体に収容される電極体と、を有し、
前記筐体は、前記第1方向と交わる方向に広がる側面を有し、
前記電極体は、前記第1方向に並ぶ正極および負極を有し、
前記軟質部は、前記第1方向から見て前記電極体の中心と重なるように配置され、
前記硬質部は、前記第1方向から見て前記側面の外縁部の少なくとも一部と重なるように配置される、
請求項1に記載の蓄電モジュール。 - 前記緩衝部材は、前記蓄電装置から離間する方向に凹む凹部を有し、
前記第1方向から見て、前記軟質部の面積に占める前記凹部の面積の割合は、前記硬質部の面積に占める前記凹部の面積の割合よりも大きい、
請求項1乃至3のいずれか1項に記載の蓄電モジュール。 - 前記凹部は、放射状に広がる複数の線部を含む、
請求項4に記載の蓄電モジュール。 - 前記蓄電装置は、筐体と、前記筐体の第1面に配置される一対の出力端子と、前記筐体に収容される電極体と、を有し、
前記筐体は、前記第1方向と交わる方向に広がる側面を有し、
前記側面は、膨れる領域を有し、
前記線部の一部は、前記第1方向から見て前記膨れる領域よりも外側に位置する、
請求項5に記載の蓄電モジュール。 - 前記線部は、前記緩衝部材の外縁部まで延びる、
請求項5に記載の蓄電モジュール - 前記緩衝部材は、前記第1方向に緩衝部材を貫通する貫通孔を有し、
前記第1方向から見て、前記軟質部の面積に占める前記貫通孔の面積の割合は、前記硬質部の面積に占める前記貫通孔の面積の割合よりも大きい、
請求項1乃至3のいずれか1項に記載の蓄電モジュール。 - 前記緩衝部材は、前記貫通孔を複数有し、
複数の前記貫通孔は、放射状に広がるように配列される、
請求項8に記載の蓄電モジュール。 - 前記緩衝部材は、前記蓄電装置に向かって突出する凸部を有し、
前記第1方向から見て、前記軟質部の面積に占める前記凸部の面積の割合は、前記硬質部の面積に占める前記凸部の面積の割合よりも小さい、
請求項1乃至3のいずれか1項に記載の蓄電モジュール。 - 前記緩衝部材は、前記凸部を複数有し、
複数の前記凸部は、放射状に広がるように配列されるとともに、放射の外側に向かうほど面積が大きくなる、
請求項10に記載の蓄電モジュール。 - 前記緩衝部材は、絶縁性を有し、前記蓄電装置と外部とを絶縁するセパレータに設けられて前記セパレータの一部を構成する、
請求項1乃至11のいずれか1項に記載の蓄電モジュール。 - 少なくとも1つの蓄電装置とともに第1方向に配列されて、前記蓄電装置から第1方向に荷重を受ける緩衝部材であって、
軟質部と、
前記軟質部よりも前記緩衝部材の外縁部側に位置する硬質部と、を備え、
前記軟質部は、前記硬質部よりも変形しやすい、
緩衝部材。
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| JP2021542790A JP7641582B2 (ja) | 2019-08-30 | 2020-08-19 | 緩衝部材および蓄電モジュール |
| CN202080040758.1A CN113906622B (zh) | 2019-08-30 | 2020-08-19 | 缓冲构件以及蓄电模块 |
| US17/633,370 US12244034B2 (en) | 2019-08-30 | 2020-08-19 | Buffer member and electrical storage module |
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| JP7641582B2 (ja) | 2025-03-07 |
| CN113906622B (zh) | 2024-05-10 |
| US12244034B2 (en) | 2025-03-04 |
| CN113906622A (zh) | 2022-01-07 |
| US20220294069A1 (en) | 2022-09-15 |
| JPWO2021039549A1 (ja) | 2021-03-04 |
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