WO2015098382A1 - Unité de module de stockage d'énergie électrique et procédé de fabrication d'unité de module de stockage d'énergie électrique - Google Patents

Unité de module de stockage d'énergie électrique et procédé de fabrication d'unité de module de stockage d'énergie électrique Download PDF

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Publication number
WO2015098382A1
WO2015098382A1 PCT/JP2014/080782 JP2014080782W WO2015098382A1 WO 2015098382 A1 WO2015098382 A1 WO 2015098382A1 JP 2014080782 W JP2014080782 W JP 2014080782W WO 2015098382 A1 WO2015098382 A1 WO 2015098382A1
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WIPO (PCT)
Prior art keywords
power storage
heat transfer
storage module
heat
transfer sheet
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Application number
PCT/JP2014/080782
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English (en)
Japanese (ja)
Inventor
直人 守作
浩生 植田
加藤　崇行
Original Assignee
株式会社豊田自動織機
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Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Publication of WO2015098382A1 publication Critical patent/WO2015098382A1/fr

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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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—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
    • 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
    • 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 module unit and a method for manufacturing a power storage module unit.
  • the electricity storage module a plurality of electricity storage devices arranged along a predetermined arrangement direction are constrained between end plates. Since each power storage device generates heat, in order to dissipate the heat, the power storage module includes a heat dissipation member, and a plurality of power storage devices constrained between the end plates are fastened to the heat dissipation member. . Furthermore, in order to improve heat transfer from each power storage device to the heat dissipation member, the power storage module includes a heat transfer sheet, and the heat transfer sheet is disposed between the plurality of power storage devices and the heat dissipation member.
  • Patent Document 1 discloses a battery in which a heat transfer sheet is deformed and sandwiched between a cooling surface of a battery module in which a plurality of battery cells are stacked and a cooling plate.
  • the distances between the opposed surfaces facing the heat radiating members of the plurality of power storage devices constrained between the end plates and the heat radiating members are not uniform (there is a positional deviation between the opposed surfaces).
  • the distance between each opposing surface and the heat dissipation member is not uniform, the opposing surface of some power storage devices and the heat transfer sheet may not contact each other, and there is a difference in heat dissipation between the plurality of power storage devices. And temperature variation occurs between the plurality of power storage devices. As a result, the performance and life of the power storage module are reduced.
  • the battery module is composed of 12 battery cells restrained between the end holders, and the two battery modules arranged between the end plates fastened by the fastening band are arranged. It is integrated.
  • the end plate is integrally provided with a mounting flange, and two battery modules between the end plates are fixed to the cooling plate with bolts passing through the mounting flange with a heat transfer sheet interposed therebetween.
  • the distance between the opposing surfaces facing the cooling plates of the 12 battery cells between the end holders is not uniform, or even between the two battery modules arranged between the end plates.
  • the case where the distance between the plates is not uniform is considered. In this case, the opposed surfaces of some of the battery cells may not contact the heat transfer sheet.
  • An electricity storage module unit includes a plurality of electricity storage units having an electricity storage device, and an electricity storage unit fixing member that fixes the plurality of electricity storage units in a state where the plurality of electricity storage units are stacked.
  • Module A heat radiating member that radiates heat received from each of the power storage units to the outside; A fastening member for fastening the power storage module to the heat dissipation member; A heat transfer sheet provided between the plurality of power storage units and the heat dissipation member, and having elasticity; The distance between the heat dissipation member and each of the power storage units is not the same, The heat transfer sheet is compressed by at least one of the power storage units such that all the power storage units are in contact with the heat transfer sheet.
  • This power storage module unit has a structure in which the power storage module is fastened by a fastening member with a heat transfer sheet interposed between the heat radiating member.
  • a plurality of power storage units each having a power storage device are arranged and restrained by a power storage unit fixing member along a predetermined arrangement direction thereof.
  • the heat generated in the power storage device of each power storage unit is transferred to the heat radiating member via the heat transfer sheet, and is radiated by the heat radiating member.
  • the heat transfer sheet is formed of a material having elasticity.
  • the heat transfer sheet is compressed by at least one power storage unit, so that all the power storage units and the heat transfer sheets are Contact. Therefore, since the plurality of power storage units are in contact with the heat transfer sheet, the heat generated by the power storage devices of the plurality of power storage units can be transferred to the heat radiating member via the heat transfer sheet.
  • the power storage module unit can improve heat dissipation by suppressing a difference in heat transfer through the heat transfer sheets of a plurality of power storage units (power storage devices). As a result, temperature variations among a plurality of power storage devices can be reduced, and a decrease in performance and life of the power storage module can be suppressed.
  • each of the power storage units may further include a heat transfer plate having an external heat transfer surface, and the power storage unit fixing member has one external heat transfer surface of each of the heat transfer plates.
  • the plurality of power storage units can be fixed so as to be exposed to the side, and the distance between the heat dissipation member and each of the external heat transfer surfaces may not be the same, and all the external heat transfer surfaces and the The heat transfer sheet may be compressed by at least one of the external heat transfer surfaces such that the heat transfer sheet is in contact with the heat transfer sheet.
  • This power storage module unit can bring the external heat transfer surface of the heat transfer plate of all the power storage units into contact with the heat transfer sheet.
  • the fastening member is a pair of brackets having an attachment part attached to the electricity storage module with a bolt or the like and a fastening part fastened to the heat dissipation member.
  • the power storage module is sandwiched between the bracket mounting portion on one side and the bracket mounting portion on the other side and mounted with bolts or the like, and each fastening portion of the pair of brackets dissipates heat.
  • the power storage module is fastened to the heat dissipation member with the heat transfer sheet interposed by being fastened to the fastening surface of the member.
  • the heat transfer sheet can be easily compressed by fastening the power storage module to the heat radiating member with the pair of brackets.
  • a method for manufacturing a power storage module unit includes a plurality of power storage units having a power storage device and a power storage unit fixing member that fixes the plurality of power storage units in a state where the plurality of power storage units are stacked.
  • the surfaces of the plurality of power storage units that face the heat radiating member are displaced from each other in a direction perpendicular to the surface, and in the step B, the heat transfer sheet is compressed on the surface closest to the heat radiating member.
  • the surfaces of all the power storage units are brought into contact with the heat transfer sheet.
  • the power storage module unit manufactured by this manufacturing method all of the plurality of power storage units (power storage devices) can come into contact with the heat transfer sheet, and the heat generated by each of the plurality of power storage devices is radiated through the heat transfer sheet. Can tell each. Therefore, according to the manufacturing method of this power storage module unit, the heat transfer difference through the heat transfer sheets of the plurality of power storage units (power storage devices) of the manufactured power storage module unit is suppressed, and heat dissipation is improved. Can do.
  • each power storage unit may further include a heat transfer plate having an external heat transfer surface, and the power storage unit fixing member exposes the external heat transfer surface of each heat transfer plate on one side.
  • the plurality of power storage units can be fixed to each other, and the external heat transfer surfaces of the plurality of heat transfer plates can be displaced from each other in a direction perpendicular to the surface.
  • the heat transfer sheet can be compressed with the external heat transfer surface closest to the member to bring all the external heat transfer surfaces into contact with the heat transfer sheet.
  • the method may further include a C step of attaching a pair of brackets to the power storage module before the B step, wherein the pair of brackets are fastened to an attachment portion attached to the power storage module and the heat dissipation member.
  • the fastening portion can be fastened to the heat dissipating member in the step B.
  • step C of the method of manufacturing the power storage module unit the plate is placed on the predetermined plane portion, the surface of at least one power storage unit is in contact with the upper surface of the plate, and the predetermined plane portion With the fastening portions of the pair of brackets being in contact with each other, the attachment portions of the pair of brackets can be attached to the power storage module.
  • the heat dissipation member on the surface of the power storage module facing the heat dissipation members of the plurality of power storage units can be easily and highly accurately.
  • the positions of the pair of brackets can be adjusted so that the distance between the surface closest to the heat dissipation member and the heat dissipation member becomes the thickness after compression.
  • the present invention it is possible to improve the heat dissipation by suppressing the difference in heat transfer between the plurality of power storage devices.
  • FIG. 2A is a diagram illustrating the maximum amount of positional deviation between the heat transfer surfaces of the heat transfer plate
  • FIG. 2B is a diagram illustrating the thickness of the heat transfer sheet before and after compression.
  • FIG. 2 is a diagram in which the holder 4 and the restraint bolts 6 are omitted from the plan view of the power storage module unit in FIG. 1 and the power storage device 2 and the heat transfer plate 3 are simplified so as to represent only their outer shapes.
  • the present invention is applied to a power storage module mounted on a forklift.
  • the power storage module according to the present embodiment is constrained in a state where a plurality of power storage units (power storage devices to which a heat transfer plate is attached and stored in a holder) are arranged along a predetermined arrangement direction between end plates. Yes.
  • the power storage module unit according to the present embodiment uses a counterweight disposed on the forklift as a heat radiating member, and the power storage module is fastened by a pair of brackets with a heat transfer sheet interposed between the side walls of the counterweight.
  • the power storage device according to the present embodiment is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the power storage module 1 will be described with reference to FIGS.
  • the power storage module unit 1 ′ to which the heat dissipation structure of the power storage module 1 is added will be described in detail.
  • the holder 4 and the restraining bolt 6 of the power storage unit U shown in FIG. 1 are omitted so that the positions of the heat transfer plate and the power storage device can be easily understood.
  • the drawing is simplified so as to represent only the outer shape.
  • the power storage module unit 1 ′ In order to improve the heat dissipation even when there is a positional deviation perpendicular to each other between the heat transfer surfaces of the plurality of power storage units U in a state of being constrained between the end plates in the power storage module 1, the power storage module unit 1 ′ It has a structure in which the difference in heat transfer from the plurality of power storage units to the counterweight is suppressed. For this reason, the power storage module unit 1 ′ has reliable heat transfer surfaces (especially heat transfer surfaces of heat transfer plates attached to the power storage device in the power storage unit) and heat transfer sheets of the plurality of power storage units in the power storage module 1. To be able to touch.
  • the power storage module 1 includes a plurality of power storage units U (in the case of the power storage module 1 according to the present embodiment, seven as shown in FIG. 1 and the like), a pair of end plates 5, and restraint bolts 6.
  • the power storage unit U is a unit including the power storage device 2, the heat transfer plate 3, and the holder 4.
  • the power storage module unit 1 ′ includes a power storage module 1, a heat transfer sheet 7, a counterweight 8, a pair of brackets 9, and fastening bolts 10 and 11.
  • the power storage module 1 corresponds to the power storage module described in the claims
  • the power storage module unit 1 ′ corresponds to the power storage module unit described in the claims
  • the power storage device 2 claims It corresponds to the power storage device described in the range
  • the heat transfer plate 3 and the holder 4 corresponds to the power storage unit described in the claims
  • the heat transfer sheet 7 corresponds to the claims.
  • the counterweight 8 corresponds to the heat transfer sheet described in the claims
  • the bracket 9 corresponds to the fastening member and the bracket described in the claims.
  • the power storage device 2 is a rectangular power storage device. Below, the structure of the electrical storage apparatus 2 (especially lithium ion secondary battery) is demonstrated. Note that the configuration of the power storage device 2 described below is an example, and power storage devices having other various configurations can be applied.
  • the power storage device 2 mainly includes a case, an electrolytic solution, and an electrode assembly.
  • the case is a case for accommodating the electrolytic solution and the electrode assembly.
  • the electrolytic solution is accommodated in the case and impregnated in the electrode assembly.
  • the electrolytic solution is, for example, an organic solvent-based or non-aqueous electrolytic solution.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator that insulates the positive electrode and the negative electrode.
  • the electrode assembly is configured by laminating a plurality of sheet-like positive electrodes, a plurality of negative electrodes, and a plurality of sheet-like (or bag-like) separators.
  • the electrode assembly is housed in a case and filled with an electrolyte in the case.
  • the positive electrode is composed of a metal foil and a positive electrode active material layer formed on at least one surface of the metal foil.
  • the positive electrode has a tab on which the positive electrode active material layer is not formed at the end of the metal foil.
  • the tab is provided on the upper edge of the positive electrode (the edge on the positive electrode terminal 2a side), and is connected to the positive electrode terminal 2a via a conductive member.
  • the metal foil is, for example, an aluminum foil or an aluminum alloy foil.
  • the positive electrode active material layer includes a positive electrode active material and a binder.
  • the positive electrode active material layer may contain a conductive additive.
  • the positive electrode active material is, for example, a composite oxide, metallic lithium, or sulfur.
  • the composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium.
  • the binder is, for example, a fluorine-containing resin such as polyvinylidene fluoride, polytetrafluoroethylene, or fluororubber, a thermoplastic resin such as polypropylene or polyethylene, an imide resin such as polyimide or polyamideimide, or an alkoxysilanol group-containing resin.
  • a fluorine-containing resin such as polyvinylidene fluoride, polytetrafluoroethylene, or fluororubber
  • a thermoplastic resin such as polypropylene or polyethylene
  • an imide resin such as polyimide or polyamideimide
  • alkoxysilanol group-containing resin e.g., a conductive auxiliary agent
  • the conductive auxiliary agent include carbon black, graphite, acetylene black, and ketjen black (registered trademark).
  • the negative electrode is composed of a metal foil and a negative electrode active material layer formed on at least one surface of the metal foil.
  • the negative electrode has a tab on which the negative electrode active material layer is not formed at the end of the metal foil.
  • the tab is provided on the upper edge of the negative electrode (the edge on the negative electrode terminal 2b side), and is connected to the negative electrode terminal 2b via a conductive member.
  • the metal foil is, for example, a copper foil or a copper alloy foil.
  • the negative electrode active material layer includes a negative electrode active material and a binder.
  • the negative electrode active material layer may contain a conductive additive.
  • Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ⁇ x ⁇ 1.5). ) And the like, and boron-added carbon.
  • the binder and the conductive auxiliary the same binder and conductive auxiliary as shown in the positive electrode can be applied.
  • As the binder carboxymethyl cellulose, methyl cellulose, styrene butadiene rubber, alkoxysilyl group-containing resin, and the like can be applied in addition to the positive electrode examples.
  • the separator separates the positive electrode and the negative electrode and allows lithium ions to pass through while preventing a short circuit of current due to contact between the two electrodes.
  • the separator is, for example, a porous film made of a polyolefin resin such as polyethylene (PE) or polypropylene (PP), a woven fabric or a nonwoven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose or the like.
  • the case includes a bottomed cylindrical main body and a lid that covers the opening of the main body. More specifically, the main body portion includes a rectangular flat plate-shaped bottom plate and four rectangular flat plate-shaped side plates extending vertically upward from four sides of the bottom plate. The main body portion contains the electrolytic solution and the electrode assembly, and the power storage device 2 is formed by covering the opening of the main body portion with the lid portion.
  • the plurality of power storage devices 2 have a pair of ends in a state in which they are arrayed along a predetermined arrangement direction (in this embodiment, the widest surfaces of each power storage device 2 face each other through the heat transfer plate 3). It is sandwiched between the plates 5.
  • the terminals 2b are arranged adjacent to each other.
  • the positive electrode terminal 2a and the negative electrode terminal 2b are each connected by the connection member 2c, and the some electrical storage apparatus 2 is electrically connected in series.
  • the direction along the arrangement direction in one power storage device 2 is the thickness direction
  • the parallel direction of the positive electrode terminal 2a and the negative electrode terminal 2b in one power storage device 2 is the width direction
  • the thickness in one power storage device 2 is the same.
  • the direction perpendicular to the vertical direction and the width direction will be referred to as the height direction and will be described.
  • the heat transfer plate 3 is a member for transmitting heat generated in the power storage device 2 to the heat transfer sheet 7 and is attached to each power storage device 2.
  • the heat transfer plate 3 is formed of a material having high thermal conductivity.
  • the heat transfer plate 3 is plate-shaped and has a L-shaped cross section as shown in FIG.
  • the heat transfer plate 3 includes a heat absorbing portion 3b disposed to face a surface intersecting with the thickness direction of the power storage device 2, and a heat transfer portion 3c facing a surface intersecting the width direction of the power storage device 2.
  • the heat transfer portion 3 c in the heat transfer plate 3 is disposed to face the portion of the counterweight 8 where the heat transfer sheet 7 is provided.
  • a part of the heat transfer plate 3 is hidden behind the holder 4 and cannot be seen.
  • the holder 4 is a member for storing a part of the power storage device 2 and holding the power storage device 2, and is provided for each power storage device 2.
  • the holder 4 has a size and shape that can accommodate a part of the power storage device 2 in a state where the heat transfer plate 3 is attached without a gap.
  • the holder 4 has a through hole (not shown) having a diameter slightly larger than the shaft diameter of the restraint bolt 6. There are a plurality of through holes, for example, four.
  • a power storage unit U is formed by one power storage device 2, one heat transfer plate 3 and one holder 4.
  • the plurality of power storage units U are arranged along the arrangement direction.
  • the pair of end plates 5 are arranged to face two power storage units U located at both ends in the arrangement direction (thickness direction) of the plurality of power storage units U, and the plurality of power storage devices 2 arranged. It is a member for applying restraint pressure to both sides and restraining.
  • the end plate 5 is plate-shaped and has a thickness sufficient to apply a restraining pressure.
  • the surface to which the end plate 5 applies the restraining pressure is slightly smaller than the area of the widest surface of the rectangular power storage device 2.
  • a through hole (not shown) having a diameter slightly larger than the shaft diameter of the restraint bolt 6 is opened corresponding to the through hole opened in the holder 4.
  • the number of through holes is the same as the number of through holes opened in the holder 4.
  • the position of the through hole is a position corresponding to the position of the through hole opened in the holder 4.
  • the same screw diameter as that of the fastening bolt 10 is used.
  • a hole (not shown) is opened. This hole is a bottomed hole and is internally threaded.
  • the number of holes is the same as the number of through holes opened in the attachment portion 9 a of the bracket 9.
  • the power storage unit U arranged on one end side in the arrangement direction and one end plate 5 are arranged so as to face each other, and the power storage unit U arranged on the other end side in the arrangement direction and the other end plate 5 are arranged so as to face each other.
  • each restraint bolt 6 is passed through the through hole of one end plate 5, the through hole of each holder 4 arranged, and the through hole of the other end plate 5, and bolted.
  • a nut may be arranged on the outer surface 5a side of the other end plate 5 and the bolt tightening may be performed with the male screw of the restraining bolt 6 and the female screw of the nut.
  • a female screw may be cut in the through hole, and bolt tightening may be performed with the male screw of the restraining bolt 6 and the female screw of the through hole of the end plate 5. Due to the tightening force of the bolt tightening, a restraining force is applied to the plurality of power storage units U arranged between the one end plate 5 and the other end plate 5, thereby being restrained.
  • a power storage module 1 includes a plurality of power storage units U arrayed along the array direction and constrained by a pair of end plates 5.
  • the restraint bolt 6 has a length sufficiently longer than the length between the pair of end plates 5.
  • the pair of end plates 5 and the plurality of restraining bolts 6 correspond to the power storage unit fixing member.
  • the plurality of power storage units U that is, the power storage module 1 constrained between the pair of end plates 5, there may be a relative displacement in each direction.
  • Misalignment between the heat transfer surfaces 3a of the plurality of heat transfer plates 3 (the heat transfer surfaces of the heat transfer plates 3 facing the counterweight 8 in a state where the power storage module 1 is fastened to the counterweight 8 by the pair of brackets 9) 3a (a difference in distance from the facing surface) may occur.
  • the diameter of each through hole of the holder 4 is slightly larger than the shaft diameter of the restraint bolt 6, there is a possibility that the positional deviation occurs with the maximum difference between the shaft diameter and the hole diameter as an upper limit. is there.
  • this position shift may also occur in other directions.
  • the cause of such positional deviation varies depending on the method of constraining the plurality of power storage devices 2 between the pair of end plates 5.
  • a plurality of power storage devices 2 are juxtaposed while regulating the position using a jig having a U-shaped cross section, and the plurality of power storage devices 2 arranged side by side are sandwiched between a pair of end plates 5 and restrained. There is a way.
  • the width of the U-shaped jig is slightly wider than the width of the power storage device 2 in order to fit and stack the power storage device 2, so the difference in width is limited to the upper limit. As a result, a positional deviation may occur.
  • the heat transfer sheet 7 is a member for transmitting the heat generated in each power storage device 2 and transferred to each heat transfer plate 3 to the counterweight 8.
  • the heat transfer sheet 7 is arranged between the heat transfer surface 3 a of each heat transfer plate 3 attached to each of the plurality of power storage units U in a state of being constrained between the pair of end plates 5 and the counterweight 8.
  • the heat transfer sheet 7 is formed of a material having high thermal conductivity and elasticity (compresses when stress is applied).
  • this material for example, there is a sheet-like TIM [Thermal Interface Material].
  • this sheet-like TIM for example, there is one in which silicon rubber (having high elastic modulus) contains powdered ceramic filler (having high thermal conductivity).
  • the area of the heat transfer sheet 7 is the total area of the heat transfer surfaces 3a of the plurality of heat transfer plates 3 constrained between the pair of end plates 5 (the area of the surface that intersects the width direction of the power storage device 2 in the power storage unit). ).
  • the maximum positional deviation amount ⁇ L can be estimated in advance according to a method of constraining a plurality of power storage units between the pair of end plates 5.
  • the maximum positional deviation amount ⁇ L can be estimated from the difference between the diameter of the through hole of the holder 4 and the shaft diameter of the restraint bolt 6. If the heat transfer sheet 7 can be compressed by the maximum displacement amount ⁇ L, the heat transfer sheet 7 can be brought into contact with the heat transfer surfaces 3 a of all the heat transfer plates 3. Therefore, in order to bring the heat transfer sheet 7 into contact with the heat transfer surfaces 3a of all the heat transfer plates 3, the heat transfer sheet 7 that can be compressed by the maximum displacement amount ⁇ L or more is used.
  • the post-compression thickness T of the heat transfer sheet 7 necessary for compression by the maximum displacement amount ⁇ L.
  • the post-compression thickness T ′ may be derived using the maximum compression rate as it is, or the post-compression thickness T using a compression rate (for example, a recommended compression rate) smaller than the maximum compression rate with a margin. ' May be derived.
  • the thickness T of the heat transfer sheet 7 can be equal to or greater than the value obtained by adding the post-compression thickness T ′ to the maximum displacement amount ⁇ L.
  • the thickness T of the heat transfer sheet 7 is set to 2 mm or more (the thickness T ′ after compression is 1 mm). If ⁇ L is 1 mm and the recommended compression rate is 40%, the thickness T of the heat transfer sheet 7 is set to 2.5 mm or more (the thickness T ′ after compression is 1.5 mm). Since the heat transfer sheet 7 is thinner, the heat transfer property is higher. Therefore, the thickness T of the heat transfer sheet 7 can be made the smallest by adding the minimum post-compression thickness T ′ to the maximum displacement amount ⁇ L.
  • the counterweight 8 is used as a member for radiating the heat transmitted by the heat transfer sheet 7. Since the counterweight 8 is a member having a large thermal mass in the forklift, it is suitable as a heat radiating member.
  • the counterweight 8 has a sufficiently large surface on which the power storage module 1 can be disposed.
  • the power storage module 1 is fastened to the side wall of the counterweight 8 with a pair of brackets 9 with the heat transfer sheet 7 interposed therebetween.
  • a side surface 8a of the counterweight 8 becomes a fastening surface.
  • the positions of the holes are positions corresponding to the positions of the through holes opened in the fastening portion 9 b of the bracket 9 when the power storage module 1 is fastened by the pair of brackets 9.
  • the number of holes is the same as the number of through holes opened in the fastening portion 9 b of the bracket 9.
  • the pair of brackets 9 are members for fastening the power storage module 1 to the side wall of the counterweight 8 and are members for adjusting the interval between the power storage module 1 and the counterweight 8.
  • the bracket 9 is substantially L-shaped.
  • the bracket 9 includes an attachment portion 9 a that is attached to the power storage module 1 with fastening bolts 10, and a fastening portion 9 b that is fastened to the counterweight 8 with fastening bolts 11.
  • the attachment portion 9a is attached to the outer surface 5a of the end plate 5 with its position adjusted.
  • a plurality of through holes (not shown) having a diameter larger than the shaft diameter of the fastening bolt 10 are opened in the mounting portion 9a. The size of the through hole is sufficiently large so that the position of the bracket 9 can be adjusted with respect to the end plate 5.
  • the bracket 9 is attached to the end plate 5 by bolt fastening with the fastening bolt 10. Further, the fastening portion 9 b has a fastening surface 9 c that is fastened to the counterweight 8 and is in contact with the fastening surface 8 a of the counterweight 8. A plurality of holes (not shown) having the same screw diameter as that of the fastening bolt 11 are opened in the fastening portion 9b.
  • the bracket 9 fastens the power storage module 1 to the counterweight 8 by bolt fastening with the fastening bolt 11.
  • the attachment portion 9a corresponds to the bracket attachment portion described in the claims
  • the fastening portion 9b corresponds to the bracket fastening portion described in the claims.
  • the power storage module unit 1 ′ in which the power storage module 1 is fastened to the side wall of the counterweight 8 will be described.
  • the power storage module unit 1 ′ is configured such that the upper surface 7 a of the heat transfer sheet 7 is the heat transfer surface 3 a of all the heat transfer plates 3 in a state where the power storage module 1 is fastened to the side wall of the counterweight 8 by a pair of brackets 9. (3a 1 to 3a 7 ). Since the distance between the counterweight 8 and each heat transfer surface 3a is not the same, the heat transfer sheet 7 is formed by at least one heat transfer surface 3a so that all the heat transfer surfaces 3a and the heat transfer sheets 7 are in contact with each other. It is compressed.
  • brackets 9 and 9 are attached to the outer surfaces 5a and 5a of the pair of end plates 5 that restrain the plurality of power storage units U, the positions of the plurality of heat transfer plates 3 are adjusted. its fastening surface 8a and the minimum distance MN become heat transfer surface 3a 4 the fastening surface 9c of the bracket 9 of the counterweight 8 opposite to the heat transfer face 3a of the heat surface 3a (fastening surface 8a of the counterweight 8)
  • the brackets 9 are attached to the end plates 5 with their positions adjusted so that the distance between them becomes the thickness T ′ after compression.
  • the heat transfer surface 3a 4 having the minimum interval MN is the heat transfer surface 3a at a position closest to the counterweight 8 in the fastened state.
  • the fastening bolt 10 When this position adjustment is performed, the fastening bolt 10 is inserted into a through hole having a diameter sufficiently larger than the shaft diameter of the fastening bolt 10 opened in the mounting portion 9 a of the bracket 9, and the male screw of the fastening bolt 10 is connected to the outer surface of the end plate 5.
  • Position adjustment can be easily performed by moving the bracket 9 up and down and left and right in a state of being screwed into the female screw of the hole opened in 5a.
  • the heat sheet 7 can be brought into contact with the upper surface 7a.
  • the heat transfer surface 3a 6 having the maximum interval MX is the heat transfer surface 3a farthest from the counterweight 8 in the fastened state.
  • the heat transfer plates 102 are respectively attached to the respective power storage devices 101, and the plurality of power storage devices 101 to which the heat transfer plates 102 are respectively attached are constrained by a pair of end plates 103.
  • the power storage module 100 is fastened to the counterweight 105 by a pair of brackets 104, and the heat transfer sheet 106 is disposed between the power storage module 100 and the counterweight 105.
  • This heat transfer sheet 106 does not have the same thickness as the thickness of the heat transfer sheet 7 according to the present embodiment (thickness equal to or greater than the value obtained by adding the thickness T ′ after compression to the maximum displacement amount ⁇ L), It has a predetermined thickness determined as appropriate.
  • the pair of brackets 104 are attached to the end plate 103 so that only the heat transfer surface 102a closest to the counterweight 105 is in contact with the heat transfer sheet 106. Therefore, there is a heat transfer plate 102 in which the heat transfer surface 102 a is not in contact with the heat transfer sheet 106, and a gap is formed between the heat transfer surface 102 a and the heat transfer sheet 106.
  • the thickness of the heat transfer sheet 7 is set to the maximum position shift amount ⁇ L between the heat transfer surfaces 3 a of the heat transfer plate 3.
  • Heat transfer from the heat transfer surface 3a having the minimum distance MN from the fastening surface 8a of the counterweight 8 to the maximum distance MX is set to a thickness T that is equal to or greater than the value of the post-compression thickness T ′ necessary for compressing by the shift amount ⁇ L.
  • the power storage module 1 is fastened to the counterweight 8 by a pair of brackets 9 so that all the heat transfer sheets 7 come into contact with the surface 3 a so that at least a part of the heat transfer surface 3 a compresses the heat transfer sheet 7.
  • the position of the bracket 9 can be easily adjusted by using the through holes having a diameter larger than the shaft diameter of the fastening bolt 10 opened in the mounting portion 9 a of the bracket 9 and the fastening bolt 10.
  • the position of the bracket 9 is adjusted so that the distance between the heat transfer surface 3a having the minimum interval MN and the fastening surface 9c of the bracket 9 (fastening surface 8a of the counterweight 8) becomes the thickness T ′ after compression. Can do.
  • FIGS. 1 to 5 A method for manufacturing the power storage module unit 1 ′ having the above configuration will be described with reference to FIGS. 1 to 5.
  • the holder 4 and the restraining bolt 6 of the power storage unit U shown in FIG. 1 are omitted so that the positions of the heat transfer plate and the power storage device can be easily understood.
  • the drawing is simplified so as to represent only the outer shape.
  • the heat transfer plate 3 is attached to each power storage device 2 and stored in the holder 4 by the same manufacturing process as in the prior art to form a power storage unit U as shown in FIG.
  • a plurality of power storage units U are arranged in the arrangement direction described above. Further, among the plurality of arranged storage units U, the storage unit U arranged on one end side in the arrangement direction and the one end plate 5 are arranged to face each other, and arranged on the other end side in the arrangement direction.
  • the storage unit U and the other end plate 5 are arranged so as to face each other, and each restraint bolt 6 is connected to a through hole of one end plate 5, a through hole of each holder 4 arranged, and the other end plate 5. Pass through the through-hole and tighten the bolt.
  • the power storage module 1 in a state in which the plurality of power storage devices 2 housed in the holders 4 are constrained between the pair of end plates 5 is formed.
  • the positions of the heat transfer surfaces 3 a of the heat transfer plate 3 may also be shifted.
  • a plate B having the same thickness as the post-compression thickness T ′ is placed on a flat surface (horizontal surface) P as shown in FIG.
  • the flat portion P may be a work table or the like, or may be a fastening surface 8 a on the side wall of the counterweight 8.
  • the plane portion P corresponds to a predetermined plane portion described in the claims.
  • the plate B is a strong plate that is not deformed by the weight of the power storage module 1.
  • the size and shape of the plate B are the same size and shape as the heat transfer sheet 7.
  • the power storage module 1 is placed on the plate B.
  • brackets 9 are respectively placed on both sides of the pair of end plates 5 so as to sandwich the power storage module 1.
  • the fastening bolts 10 are inserted into the respective through holes of the mounting portion 9 a of the bracket 9, and the male screws of the fastening bolts 10 are slightly inserted into the female screws of the holes opened in the outer surface 5 a of the end plate 5.
  • the counterweight 8 is arranged so that the fastening surface 8 a on the side wall of the counterweight 8 faces upward.
  • the heat transfer sheet 7 is placed on the fastening surface 8a.
  • seat 7 is arrange
  • the power storage module 1 to which the pair of brackets 9 are attached is mounted on the heat transfer sheet 7.
  • the heat transfer sheet 7 takes only the own weight of the battery module 1, the fastening surface of the counterweight 8 of the most popping and has heat transfer surfaces 3a 4 (the engaged state of the heat transfer face 3a of the heat transfer plate 3 Only the heat transfer surface 3 a 4 ) having the minimum distance MN from 8 a is placed in contact with the upper surface 7 a of the heat transfer sheet 7.
  • the heat transfer surface 3 a other than the heat transfer surface 3 a 4 may be in contact with the upper surface 7 a of the heat transfer sheet 7 due to its own weight. Therefore, the fastening surface 9c of each bracket 9 does not contact the fastening surface 8a of the counterweight 8, and is in a floating state.
  • the power storage module 1 to which the pair of brackets 9 are attached can be easily moved on the heat transfer sheet 7.
  • the positions of the through holes opened in the fastening portions 9b of the brackets 9 are aligned with the positions of the bolt fastening holes opened on both sides of the fastening surface 8a, respectively.
  • the position of the power storage module 1 to which the pair of brackets 9 are attached is adjusted on the heat transfer sheet 7.
  • the fastening bolts 11 are respectively passed through the through holes opened in the fastening portions 9b of the brackets 9, and the tips of the fastening bolts 11 are connected to the counterweights 8 respectively.
  • Each of the holes is opened in the fastening surface 8a.
  • a fastening force is applied to each fastening bolt 11, and the male screw of each fastening bolt 11 is screwed into the female screw of each hole opened in the fastening surface 8a.
  • heat transfer surfaces 3a 4 serving as a fastening surface 8a and the maximum distance MX counterweight 8 of the heat transfer face 3a of the heat transfer plate 3 is also in contact with the upper surface 7a of the heat transfer sheet 7, all of the heat transfer plate 3 is in a state where the heat transfer surface 3 a is in contact with the upper surface 7 a of the heat transfer sheet 7.
  • the storage module 1 is fastened to the side wall of the counterweight 8 with the heat transfer sheet 7 interposed therebetween by the plurality of brackets 9.
  • said manufacturing method is an example and you may make it fasten with the bracket 9 to the side wall of the counterweight 8 with another manufacturing method.
  • the power storage module 1 may be fastened to the side wall of the counterweight 8 by the bracket 9 in a state where the counterweight 8 is assembled to the forklift.
  • the power storage module having the above-described configuration is obtained by fastening the power storage module 1 with the heat transfer sheet 7 interposed on the side wall of the counterweight 8 by the bracket 9 by the manufacturing method described above.
  • Unit 1 ' can be manufactured.
  • the manufactured power storage module unit 1 ′ has the effects described above.
  • each bracket 9 is adjusted with respect to the end plate 5 by using the plate B having the same thickness as the post-compression thickness T ′, so that the minimum interval MN can be easily and highly accurately.
  • the position of each bracket 9 can be adjusted such that the space between the heat transfer surface 3a 4 and the fastening surface 9c of each bracket 9 has a thickness T ′ after compression.
  • the heat transfer sheet 7 can be easily compressed up to a thickness corresponding to the post-compression thickness T ′, and transferred from the heat transfer surface 3a 4 having the minimum interval MN to the heat transfer surface 3a 6 having the maximum interval MX.
  • the heat transfer sheet 7 can be brought into contact with each other, and all the heat transfer surfaces 3 a can be brought into contact with the heat transfer sheet 7.
  • the position is adjusted with respect to the end plate 5 of each bracket 9 using a through-hole having a diameter larger than the shaft diameter of the fastening bolt 10 opened in the attachment portion 9a of each bracket 9 and the fastening bolt 10.
  • the position of the bracket 9 can be easily adjusted so that the post-compression thickness T ′ is between the heat transfer surface 3a 4 having the minimum interval MN and the fastening surface 9c of each bracket 9.
  • the counterweight provided in the forklift is used as a heat dissipation member applied to the power storage module mounted on the forklift, but the heat dissipation member can be applied to various other things such as an automobile other than the forklift. Also, various other things such as a cooling plate can be applied.
  • the present invention is applied to a power storage module in which seven power storage devices are connected in series, but the number of power storage devices may be other than seven, and a plurality of power storage devices are connected in parallel or in parallel and in series. It may be configured.
  • the power storage device is housed in the holder, and the plurality of power storage devices housed in the holder are constrained between the end plates. It is good also as a structure restrained by. In addition, a configuration in which a plurality of power storage devices is constrained may be constrained in another form without an end plate.
  • a heat transfer plate is attached to each power storage device, and the heat of the power storage device is transmitted to the heat transfer sheet via the heat transfer plate.
  • the heat of the power storage device is stored. It is good also as a structure directly transmitted to a heat transfer sheet from an apparatus. In this case, one surface of the power storage device is a heat transfer surface.
  • a plurality of brackets are used as fastening members, and the power storage module is fastened to the counterweight (heat radiating member).
  • the fastening member can be adjusted in position and restrained. Any member may be applied as long as a plurality of heat storage devices can be fastened to the heat dissipation member.
  • a hole larger than the shaft diameter of the bolt is opened in the mounting portion of the bracket, and the position is adjusted and fixed by the hole and the bolt.
  • the bracket may be fixed to the end plate by welding or the like after the position of the bracket is adjusted with respect to the end plate without using a bolt.
  • the distance between the fastening surface of the counterweight of the heat transfer surfaces of the plurality of heat transfer plates, the heat transfer surface that is the minimum interval, and the fastening surface of each bracket Adjust the position of the bracket with respect to the end plate so that the thickness of the heat transfer sheet becomes the compressed thickness of the heat transfer sheet, and transfer the heat transfer surface to the heat transfer surface that has the maximum distance from the counterweight fastening surface among the heat transfer surfaces of the heat transfer plates.
  • the heat transfer sheet Although it is configured to contact the heat sheet (and hence the heat transfer surface of all the heat transfer plates contact the heat transfer sheet), if the heat transfer sheet can be contacted up to the maximum heat transfer surface, the minimum distance The distance between the heat transfer surface and the fastening surface of each bracket (the fastening surface of the counterweight) may not be the thickness after compression.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention concerne une unité de module de stockage d'énergie électrique qui comprend: un module de stockage d'énergie électrique qui comporte une pluralité d'unités de stockage d'énergie électrique comprenant des dispositifs de stockage d'énergie électrique, et des éléments de fixation d'unité de stockage d'énergie électrique qui fixent l'une à l'autre la pluralité d'unités de stockage d'énergie électrique dans un état dans lequel la pluralité d'unités de stockage d'énergie électrique se chevauchent; un élément de dissipation de chaleur qui diffuse vers l'extérieur la chaleur reçue en provenance des unités de stockage d'énergie électrique; des éléments de fixation qui fixent le module de stockage d'énergie électrique à l'élément de dissipation de chaleur; et une feuille de transfert de chaleur qui est élastique et est disposée entre la pluralité d'unités de stockage d'énergie électrique et l'élément de dissipation de chaleur. La distance entre l'élément de dissipation de chaleur et chacune des unités de stockage d'énergie électrique n'est pas la même. La feuille de transfert de chaleur est compressée par au moins une des unités de stockage d'énergie électrique de manière que toutes les unités de stockage d'énergie électrique et la feuille de transfert de chaleur soient en contact.
PCT/JP2014/080782 2013-12-26 2014-11-20 Unité de module de stockage d'énergie électrique et procédé de fabrication d'unité de module de stockage d'énergie électrique WO2015098382A1 (fr)

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JP2013268587A JP5835315B2 (ja) 2013-12-26 2013-12-26 蓄電モジュールユニット及び蓄電モジュールユニットの製造方法
JP2013-268587 2013-12-26

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JP2017111872A (ja) * 2015-12-14 2017-06-22 株式会社豊田自動織機 電池モジュール及び電池パックの製造方法、電池モジュール、並びに電池パック
CN106935915A (zh) * 2015-12-31 2017-07-07 中科泰能科技发展有限公司 方形镍电池散热方法
JP6561849B2 (ja) * 2016-01-08 2019-08-21 株式会社豊田自動織機 電池モジュール
JP6705285B2 (ja) * 2016-05-23 2020-06-03 株式会社豊田自動織機 電池パック及び電池モジュール
JP6805606B2 (ja) * 2016-07-26 2020-12-23 株式会社豊田自動織機 電池モジュール及び電池モジュールの製造方法
WO2018047337A1 (fr) * 2016-09-12 2018-03-15 株式会社東芝 Unité de batterie et dispositif de batterie de stockage de véhicule
KR102088477B1 (ko) 2017-05-16 2020-03-12 주식회사 엘지화학 배터리 모듈
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