WO2022034759A1 - Élément de dissipation de chaleur, structure de dissipation de chaleur et batterie - Google Patents

Élément de dissipation de chaleur, structure de dissipation de chaleur et batterie Download PDF

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Publication number
WO2022034759A1
WO2022034759A1 PCT/JP2021/025426 JP2021025426W WO2022034759A1 WO 2022034759 A1 WO2022034759 A1 WO 2022034759A1 JP 2021025426 W JP2021025426 W JP 2021025426W WO 2022034759 A1 WO2022034759 A1 WO 2022034759A1
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WIPO (PCT)
Prior art keywords
heat
heat radiating
heat dissipation
sheet
battery
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Application number
PCT/JP2021/025426
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English (en)
Japanese (ja)
Inventor
和哉 中田
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信越ポリマー株式会社
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Publication date
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Publication of WO2022034759A1 publication Critical patent/WO2022034759A1/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
    • H01M10/61—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • 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 heat radiating member, a heat radiating structure, and a battery.
  • Control systems for automobiles, aircraft, ships or household or commercial electronic devices are becoming more accurate and complex, and the density of small electronic components on circuit boards is increasing. .. As a result, it is strongly desired to solve the failure and shortening of the life of electronic components due to heat generation around the circuit board.
  • the circuit board itself has traditionally been made of a material with excellent heat dissipation, and a single or multiple means such as attaching a heat sink or driving a cooling fan have been used. It is done.
  • a method in which the circuit board itself is made of a material having excellent heat dissipation, such as diamond, aluminum nitride (AlN), cubic boron nitride (cBN), etc. makes the cost of the circuit board extremely high.
  • the arrangement of the cooling fan causes a problem that a rotating device called a fan fails, maintenance is required to prevent the failure, and it is difficult to secure an installation space.
  • the heat radiating fin is a simple one that can increase the surface area and further improve the heat radiating property by forming a large number of columnar or flat plate-shaped projecting portions using a metal having high thermal conductivity (for example, aluminum). Since it is a member, it is generally used as a heat dissipation component (see Patent Document 1).
  • the rubber sheet has lower thermal conductivity than aluminum or graphite, it is difficult to efficiently transfer heat from the battery cell to the housing.
  • a method of sandwiching a spacer such as graphite instead of a rubber sheet is also conceivable, but since the lower surfaces of a plurality of battery cells are not flat and have steps, a gap is created between the battery cells and the spacer, and the heat transfer efficiency is improved. descend.
  • the battery cell can take various forms (including unevenness such as a step or a non-smooth surface state), it can be adapted to various forms of the battery cell and has high heat transfer efficiency. There is a growing demand for realization.
  • the applicant has proposed to bring a graphite or metal heat radiating member into contact with a heat source to improve the heat radiating property from the heat source.
  • a heat source it may be necessary to improve not only heat dissipation but also electrical insulation.
  • the adhesion with the heat source is further enhanced to improve the heat dissipation.
  • Such a point leads not only to the battery cell but also to other heat sources such as circuit boards, electronic components or the main body of electronic devices. Responding to such demands will also contribute to the achievement of Applicant's Sustainable Development Goals of "Ensuring access to cheap, reliable and sustainable modern energy for all.”
  • the present invention has been made in view of the above problems, and is adaptable to various forms of heat sources, has abundant elastic deformability, and has high heat dissipation and electrical insulation properties, a heat dissipation structure, and a battery.
  • the purpose is to provide.
  • the heat dissipation member according to the embodiment for achieving the above object is a heat dissipation member that enhances heat dissipation from a heat source, and has a form in which a sheet is rolled into an arc shape, and the sheet has heat conduction. It includes a member and a coating layer that covers the outside of the heat conductive member.
  • the heat radiating member according to another embodiment may preferably have a form in which the long sheet is spirally wound and advanced.
  • the coating layer may be configured such that the thickness of the outer surface rounded in an arc shape is thinner than the thickness of the inner surface rounded in an arc shape.
  • the coating layer includes a flange provided on at least one of the width directions of the sheet and a bag body closed by the flange, and the heat conduction is provided.
  • the member may be present inside the bag body.
  • the heat conductive member may be a liquid or a flowable semi-solid body.
  • the liquid or the semi-solid body may contain a carbon filler.
  • the heat conductive member is the liquid or the semi-solid body arranged on the outside rolled in an arc shape and the solid arranged on the inside arranged in an arc shape. May include a shaped plate and.
  • the heat radiating member according to another embodiment preferably includes a high adhesion means for enhancing the adhesion between the coating layer and the heat conductive member between the coating layer and the heat conductive member. You may have.
  • the heat radiating structure according to the embodiment includes two or more heat radiating members according to any one of the above.
  • the battery according to one embodiment is a battery having one or more battery cells as heat sources in a housing, and any of the above-mentioned batteries is provided between the battery cells and the housing. It is equipped with a heat dissipation member.
  • a heat radiating member a heat radiating structure, and a battery that are adaptable to various forms of a heat source, are rich in elastic deformability, and have high heat dissipation and electrical insulation.
  • FIG. 1A shows a plan view of a long sheet used for a heat radiating member according to an embodiment of the present invention.
  • FIG. 1B shows a plan view of a heat radiating member using the sheet of FIG. 1A.
  • FIG. 1C shows an enlarged cross-sectional view when the heat radiating member of FIG. 1B is cut along the line AA.
  • FIG. 2A shows an example of manufacturing a coating layer provided with the flange of FIG. 1C.
  • FIG. 2B shows a manufacturing example different from that of FIG. 2A.
  • FIG. 2C shows a manufacturing example different from that of FIGS. 2A and 2B.
  • FIG. 3A shows a modified example of the heat dissipation member of FIG.
  • FIG. 1C in an enlarged cross-sectional view taken along the line AA similar to that of FIG. 1C.
  • FIG. 3B shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from that of FIG. 3A.
  • FIG. 3C shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A and 3B.
  • FIG. 3D shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A, 3B and 3C.
  • FIG. 3E shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A, 3B, 3C and 3D.
  • FIG. 3A, 3B, 3C and 3D shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A, 3B, 3C and 3D.
  • FIG. 4 shows a plan view of the heat dissipation structure according to the embodiment.
  • FIG. 5 shows a plan view of a modified example of the heat dissipation structure of FIG.
  • FIG. 6 shows a vertical cross-sectional view of a battery including two or more heat dissipation members of FIG. 1B.
  • FIG. 7 is a cross-sectional view when the battery cell is horizontally placed on the heat radiation structure of FIG. 4 so as to be in contact with the side surface of the battery cell, a partially enlarged view thereof, and a part when the battery cell expands during charging and discharging. Sectional views are shown respectively.
  • FIG. 8A shows a manufacturing process of the heat radiating member according to the first modification and a front view of the heat radiating member.
  • FIG. 8B shows a front view of the heat radiating member according to the second modification.
  • FIG. 1A shows a plan view of a long sheet used for a heat radiating member according to an embodiment of the present invention.
  • FIG. 1B shows a plan view of a heat radiating member using the sheet of FIG. 1A.
  • FIG. 1C shows an enlarged cross-sectional view when the heat radiating member of FIG. 1B is cut along the line AA.
  • the heat radiating member 2 is a heat radiating member that enhances heat dissipation from a heat source, and has a form in which the sheet 1 is rolled into an arc shape.
  • the sheet 1 is a long sheet. Further, the sheet 1 has a form in which the sheet 1 is continuously rolled in an arc shape and is wound in a so-called spiral shape. The morphology that progresses while being wound in a spiral shape is included in the morphology that is rolled into an arc shape.
  • the long sheet 1 may be referred to as a band-shaped sheet 1.
  • the sheet 1 includes a heat conductive member 20 and a coating layer 10 that covers the outside of the heat conductive member 20.
  • the heat radiating member 2 is a long member wound in a spiral shape. Therefore, the heat radiating member 2 can be deformed so as to form irregularities in units of the width of the sheet 1 in the thickness direction thereof, and can be expanded and contracted in the length direction of the heat radiating member 2.
  • the covering layer 10 constituting the sheet 1 preferably includes a flange 11 provided on at least one of the width directions of the sheet 1 (both in this embodiment), and a bag body 15 closed by the flange 11.
  • the heat conductive member 20 exists inside the bag body 15.
  • the flange 11 is more preferably a portion formed on the entire outer peripheral edge of the sheet 1 and sealing the heat conductive member 20.
  • the flange 11 can be manufactured, for example, by the following method.
  • FIG. 2A shows an example of manufacturing a coating layer provided with the flange of FIG. 1C.
  • FIG. 2B shows a manufacturing example different from that of FIG. 2A.
  • FIG. 2C shows a manufacturing example different from that of FIGS. 2A and 2B.
  • FIG. 2A shows a cross-sectional view of a method of heat welding the same or a plurality of types of thermoplastic resins.
  • a covering layer 10 having a flange 11 and formed into a U-shaped cross section is prepared first.
  • the groove of the coating layer 10 is filled with the heat conductive member 20 or a curable composition that is cured to become the heat conductive member 20.
  • the lid corresponding to the inner sheet 12, which will be described later, is heat-welded from above the filler and the flange 11.
  • ultrasonic welding, vibration welding, high frequency welding, laser welding and the like can be exemplified.
  • FIG. 2B shows a cross-sectional view of the extrusion tube method.
  • a tube (corresponding to the inside of the bag 15) formed by monochromatic or multicolor extrusion is filled with a heat conductive member 20 or a curable composition that is cured to become a heat conductive member 20.
  • the flange 11 is formed during extrusion molding. In this way, the covering layer 10 having the heat conductive member 20 inside is completed.
  • FIG. 2C shows a cross-sectional view of the laminating method.
  • printing is performed with ink containing a component for the heat conductive member 20 on a film corresponding to the outer sheet 13 described later.
  • a film corresponding to the inner sheet 12 described later is attached to the printed surface.
  • a flange 11 formed of two films is formed on the outside of the print layer. In this way, the laminated coating layer 10 having the heat conductive member 20 inside is completed.
  • the above-mentioned welding method is not limited to the above-mentioned example. Any welding method or further bonding method can be used as long as the heat conductive member 20 existing inside the bag body 15 of the coating layer 10 can be sealed.
  • the end portion of the sheet 1 in the length direction is the end portion without the flange 11.
  • the heat radiating member 2 with the flange 11 can be manufactured by sealing the end portion in the length direction.
  • the flange 11 is useful for maintaining the elasticity of the heat radiating member 2 when the sheet 1 is spirally wound due to its rigidity.
  • the coating layer 10 and the heat conductive member 20 will be described in detail. ..
  • the coating layer 10 includes an inner sheet 12 located inside the spiral heat-dissipating member 2, an outer sheet 13 located outside the spiral heat-dissipating member 2, and both sides of the inner sheet 12 in the width direction.
  • a protruding flange 11 and a flange 11 are provided.
  • the area closed by the inner sheet 12 and the outer sheet 13 constitutes the bag body 15.
  • the bag body 15 is a portion protruding from the inner sheet 12 in the cross-sectional view thereof.
  • the protruding surface of the bag body 15 is preferably a bay arc-shaped surface.
  • the flange 11 is configured to be flush with the inner sheet 12, but it does not have to be flush with the inner sheet 12.
  • the covering layer 10 is preferably configured such that the thickness of the outer surface of the spiral is thinner than the thickness of the inner surface of the spiral. That is, the thickness (T1) of the outer sheet 13 is smaller than the thickness (T2) of the inner sheet 12.
  • the outer sheet 13 is a portion that comes into contact with a heat source. By making the thickness (T1) of the outer sheet 13 as thin as possible, the heat conductivity from the heat source to the heat conductive member 20 can be enhanced.
  • the thickness (T1) of the outer sheet 13 is preferably smaller than the thickness of the heat conductive member 20 (same as the thickness direction of the sheet 1). Further, the materials of the inner sheet 12 and the outer sheet 13 may be the same or different.
  • the coating layer 10 is a layer capable of covering and protecting the heat conductive member 20 by enhancing both the electrical insulation property with the heat source and the adhesion with the heat source.
  • the coating layer 10 is preferably a layer having higher electrical insulation than the heat conductive member 20.
  • the electrical resistivity of the coating layer 10 is preferably 1.0 ⁇ 10 7 (Ohm ⁇ m) or more, and more preferably 1.0 ⁇ 10 8 (Ohm ⁇ m) or more.
  • the coating layer 10 is preferably a layer having a lower hardness than the heat conductive member 20.
  • the coating layer 10 is preferably a thermoplastic elastomer such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); urethane-based , Ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other thermoplastic elastomers, or composites thereof.
  • a thermoplastic elastomer such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); urethane-based , Ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other
  • the coating layer 10 may be formed of a heat-resistant resin such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamideimide (PAI), aromatic polyamide (aramid fiber), or the like.
  • the coating layer 10 is preferably made of a material having high heat resistance to the extent that its morphology can be maintained without being melted or decomposed by the heat transferred from the heat source.
  • the coating layer 10 is more preferably composed of a urethane-based elastomer impregnated with silicone or a silicone rubber.
  • the coating layer 10 may be configured by dispersing a filler typified by Al 2 O 3 , AlN, cBN, hBN, diamond particles, or the like in rubber in order to enhance its thermal conductivity as much as possible.
  • the "coating layer” means a member having high flexibility and elastically deformable so as to be in close contact with the surface of a heat source, and in this sense, it can be read as "rubber-like elastic body".
  • the coating layer 10 can also be made of a sponge or a solid (a structure that is not porous like a sponge) formed of resin, rubber, or the like.
  • the heat conduction member 20 receives heat from a heat source via a coating layer 10 and transfers heat to a portion (cooling portion or another heat source) other than the heat source via the coating layer 10.
  • the heat conductive member 20 is a member having a higher thermal conductivity than the coating layer 10.
  • the heat conductive member 20 does not necessarily have to be a member having high electrical conductivity.
  • the heat conductive member 20 may be excellent in heat conductivity regardless of the level of electrical conductivity. Even when the heat conductive member 20 is excellent in both electric conductivity and heat conductivity, since the coating layer 10 is interposed between the heat source and the heat conductive member 20, the heat source and the heat conductive member 20 are insulated from each other. You can secure sex.
  • the heat conductive member 20 is preferably a liquid or a fluid semi-solid body.
  • the heat conductive member 20 preferably contains oil, particularly silicone oil.
  • Silicone oils preferably consist of molecules with a linear structure having a siloxane bond of 2000 or less. Silicone oil is roughly classified into straight silicone oil and modified silicone oil. Examples of the straight silicone oil include dimethyl silicone oil, methyl phenyl silicone oil, and methyl hydrogen silicone oil. Examples of the modified silicone oil include reactive silicone oil and non-reactive silicone oil.
  • the reactive silicone oil includes, for example, various silicone oils such as an amino-modified type, an epoxy-modified type, a carboxy-modified type, a carbinol-modified type, a methacryl-modified type, a mercapto-modified type, and a phenol-modified type.
  • the non-reactive silicone oil includes various silicone oils such as a polyether-modified type, a methylstyryl-modified type, an alkyl-modified type, a higher fatty acid ester-modified type, a hydrophilic special-modified type, a higher fatty acid-containing type, and a fluorine-modified type.
  • the oil preferably contains a thermally conductive filler composed of one or more of metal, ceramics or carbon, in addition to the oil component.
  • the metal include gold, silver, copper, aluminum, beryllium, and tungsten.
  • the ceramics include alumina, aluminum nitride, cubic boron nitride, and hexagonal boron nitride.
  • Examples of carbon include diamond, graphite, diamond-like carbon, amorphous carbon, and carbon nanotubes.
  • a carbon filler such as graphite can be more preferably exemplified.
  • the filler may have any shape such as granular, needle-shaped, and fibrous.
  • a paste such as grease can be exemplified.
  • Grease mainly contains base oils, thickeners and additives.
  • a thermally conductive filler consisting of one or more of the above-exemplified metals, ceramics or carbon can be included.
  • FIG. 3A shows a modified example of the heat radiating member of FIG. 1C in an enlarged cross-sectional view taken along the line AA similar to that of FIG. 1C.
  • FIG. 3B shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from that of FIG. 3A.
  • FIG. 3C shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A and 3B.
  • FIG. 3D shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A, 3B and 3C.
  • FIG. 3E shows an enlarged sectional view taken along line AA similar to FIG. 1C as a modification different from FIGS. 3A, 3B, 3C and 3D.
  • FIG. 3A shows a heat radiating member 2 including a liquid or semi-solid heat conductive member and a solid heat conductive member inside the bag 15. That is, the heat radiating member 2 includes a liquid or semi-solid heat conductive member 20 arranged outside the spiral and a solid plate 25 arranged inside the spiral.
  • the solid plate 25 is an example of another heat conductive member different from the heat conductive member 20.
  • the liquid or semi-solid heat conductive member 20 can flexibly deform and adhere to the surface shape of the heat source, and the solid plate 25 can exhibit a function of realizing good heat conduction. Is.
  • the solid plate 25 is, for example, a carbon plate typified by graphite, a metal plate typified by aluminum, and a ceramic plate typified by alumina. Hereinafter, details and variations of the solid plate 25 will be described.
  • the solid plate 25 is not limited to its constituent material, but is preferably a sheet containing carbon, and more preferably a sheet composed of 90% by mass or more of carbon.
  • a graphite film formed by firing a resin can also be used for the solid plate 25.
  • the solid plate 25 may be a sheet containing carbon and resin.
  • the resin may be synthetic fiber, and in that case, aramid fiber can be preferably used as the resin.
  • carbon as used in the present application is broadly defined to include any structure composed of carbon (element symbol: C) such as graphite, carbon black having lower crystallinity than graphite, diamond, and diamond-like carbon having a structure similar to diamond. Is interpreted as.
  • the solid plate 25 can be a thin sheet obtained by curing a material in which graphite fibers or carbon particles are mixed and dispersed in a resin.
  • the solid plate 25 may be carbon fibers knitted in a mesh shape, and may be blended or knitted.
  • various fillers such as graphite fiber, carbon particles or carbon fiber are all included in the concept of carbon filler.
  • the resin may exceed 50% by mass or 50% by mass or less with respect to the total mass of the solid plate 25. Is also good. That is, it does not matter whether or not the solid plate 25 is mainly made of resin as long as there is no great problem in heat conduction.
  • a thermoplastic resin can be preferably used.
  • the thermoplastic resin a resin having a high melting point that does not melt when conducting heat from a heat source is preferable, and for example, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamideimide (PAI), and fragrance.
  • Group polyamide (aramid fiber) and the like can be preferably mentioned.
  • the resin is dispersed in the gaps between the carbon fillers, for example, in the form of particles or fibers in the state before molding of the solid plate 25.
  • the solid plate 25 may or may not have excellent conductivity.
  • the thermal conductivity of the solid plate 25 is preferably 10 W / mK or more.
  • the solid plate 25 is preferably a film made of graphite and is made of a material having excellent thermal conductivity and conductivity.
  • the solid plate 25 is preferably a sheet having excellent bendability (or flexibility), and the thickness thereof is not limited, but 0.02 to 3 mm is preferable, and 0.03 to 0.5 mm is more preferable. ..
  • the amount of heat transmitted by the solid plate 25 increases as the thickness of the plate 25 increases. It is preferable to determine the thickness by comprehensively considering the strength, flexibility and thermal conductivity of the sheet.
  • the heat conductive member 20 having a low hardness and being easily deformed and the solid plate 25 having a higher hardness than the heat conductive member 20 are placed in a bag body 15 so as to be located on the outside and the inside of the spiral heat radiation member 2, respectively. If it is provided inside the above, it is possible to achieve both high adhesion to a heat source and high thermal conductivity in the length direction of the heat radiating member 2.
  • the enlarged view of a part B shows a cross section of a boundary portion between the solid plate 25 and the inner sheet 12.
  • the solid plate 25 has an uneven easy-adhesion surface 26 on the surface facing the inner sheet 12.
  • the easy contact surface 26 is an uneven surface.
  • the easy-adhesion surface 26 is an example of a high-adhesion means for enhancing the adhesion between the coating layer 10 and the heat conductive member (solid plate 25).
  • the easy contact surface 26 may be formed on the inner sheet 12 side.
  • FIG. 3B shows a heat radiating member 2 in which the thickness of the inner sheet 12 and the thickness of the outer sheet 13 are substantially the same. Since the outer sheet 13 is a contact area with a heat source, it is preferable that the outer sheet 13 is as thin as possible. On the other hand, the inner sheet 12 is thinner than the outer sheet 13 as an important factor. However, the inner sheet 12 may have the same thickness as the outer sheet 13. In this example, the flange 11 is not flush with the inner sheet 12.
  • FIG. 3C shows a flangeless heat dissipation member 2.
  • the coating layer 10 contains a liquid or semi-solid heat conductive member 20 inside.
  • the cross-sectional shape of the heat radiating member 2 is substantially rectangular. As described above, the heat radiating member 2 may be flangeless. Similar to the heat radiating member 2 of FIG. 3A, it is preferable that T1 ⁇ T2.
  • FIG. 3D shows a heat dissipation member 2 that is flangeless and has a heat conductive member as a solid plate 25.
  • the cross-sectional shape of the heat radiating member 2 is substantially rectangular.
  • the liquid or semi-solid heat conductive member 20 is not an essential component, but may be a member provided with a solid plate 25. Similar to the heat radiating member 2 of FIG. 3A, it is preferable that T1 ⁇ T2.
  • the enlarged view of a part C shows a cross section of a boundary portion between the solid plate 25 and the outer sheet 13.
  • the heat radiating member 2 has an adhesive layer 27 between the solid plate 25 and the outer sheet 13.
  • the adhesive layer 27 is between the coating layer 10 and the heat conductive member (solid plate 25), and is an example of high adhesion means for improving the adhesion between the two 10 and 25.
  • the adhesive layer 27 may be formed between any surface inside the coating layer 10 such as the inner sheet 12 and the solid plate 25.
  • FIG. 3E shows a heat dissipation member 2 that is flangeless and includes a liquid or semi-solid heat conductive member and a solid heat conductive member as in FIG. 3A.
  • the cross-sectional shape of the heat radiating member 2 is substantially rectangular.
  • the heat radiating member 2 of FIG. 3E and the heat radiating member 2 of FIG. 3A are common in that they include both the solid plate 25 and the heat conductive member 20 of a liquid or a semi-solid body.
  • a high-adhesion means represented by the easy-adhesion surface 26 or the adhesive layer 27 may be formed between the solid plate 25 and the inner sheet 12. Further, the high adhesion means may be formed on the heat conductive member 20 side. Similar to the heat radiating member 2 of FIG. 3A, it is preferable that T1 ⁇ T2.
  • FIG. 4 shows a plan view of the heat dissipation structure according to the embodiment.
  • FIG. 5 shows a plan view of a modified example of the heat dissipation structure of FIG.
  • the heat dissipation structures 3 and 4 described below include two or more heat dissipation members 2 according to the above-described embodiment and various modifications.
  • the heat radiating structure 3 is an aggregate of two or more heat radiating members 2 in a non-connected state. For example, when the heat radiating structure 3 is interposed between the heat source and the cooling member, it is preferable to arrange two or more heat radiating members 2 in a separated state.
  • the heat radiating structure 4 is a structure in which two or more heat radiating members 2 are arranged in a direction perpendicular to the length direction thereof, and the heat radiating members 2 are fixed to each other by using a tape-shaped fixing member 5.
  • the fixing member 5 preferably fixes both ends of the heat radiating member 2 in the length direction. However, in addition to the both ends, the substantially central portion of the heat radiating member 2 in the length direction may be fixed. Further, either one end side may be fixed. Further, only the substantially central portion may be fixed. Further, although the fixing member 5 fixes only one side of the heat dissipation structure 4, it may be fixed on both sides of the front and back sides. Further, the fixing member 5 is not limited to the tape-shaped member, and may be a thread.
  • the heat radiating members 2 may be tied together with a thread and fixed, or may be sewn and fixed with a thread.
  • the heat radiating structure 4 is interposed between the heat source and the cooling member, it is preferable to arrange two or more heat radiating members 2 in a connected state.
  • FIG. 6 shows a vertical cross-sectional view of a battery including two or more heat dissipation members of FIG. 1B.
  • the "vertical cross-sectional view” means a view that vertically cuts from the upper opening surface inside the housing of the battery to the bottom.
  • the battery 30 is, for example, a battery for an electric vehicle and includes a large number of battery cells 40.
  • the battery 30 includes a bottomed housing 31 that opens to one side.
  • the housing 31 is preferably made of aluminum or an aluminum-based alloy.
  • the battery cell 40 is arranged inside 34 of the housing 31.
  • An electrode is provided above the battery cell 40 so as to project.
  • the plurality of battery cells 40 are preferably brought into close contact with each other in the housing 31 by applying a force in the direction of compression from both sides thereof using screws or the like (not shown).
  • the battery cell 40 is arranged in the housing 31 so as to sandwich the heat radiating structure 3 with the bottom portion 32 of the housing 31.
  • the heat radiating structure 4 may be arranged instead of the heat radiating structure 3.
  • the bottom portion 32 is provided with a flow path 33 for flowing cooling water, which is an example of a cooling medium (also referred to as a cooling member or a cooling agent) 35.
  • a cooling medium also referred to as a cooling
  • the battery 30 includes a battery cell 40 as one or more heat sources in the housing 31, and a heat dissipation member 2 is provided between the battery cell 40 and the housing 31 (for example, the bottom 32). Be prepared. It can be said that the plurality of heat radiating members 2 provided in the heat radiating structure 3 are interposed between the battery cell 40 and the cooling medium 35. In the battery 30 having such a structure, the battery cell 40 transfers heat to the cooling medium 35 flowing through the bottom portion 32 and the flow path 33 through the heat radiating member 2, and is effectively removed by water cooling.
  • FIG. 7 is a cross-sectional view when the battery cell is horizontally placed on the heat radiation structure of FIG. 4 so as to be in contact with the side surface of the battery cell, a partially enlarged view thereof, and a part when the battery cell expands during charging and discharging. Sectional views are shown respectively.
  • the battery cell 40 may be arranged so that the side surface of the battery cell 40 is in contact with each heat radiating member 2 of the heat radiating structure 3.
  • the temperature of the battery cell 40 rises during charging and discharging. If the container of the battery cell 40 itself is made of a flexible material, the side surface of the battery cell 40 may bulge in particular. Even in such a case, as shown in FIG.
  • each heat dissipation member 2 of the heat dissipation structure 3 can be deformed according to the shape of the outer surface of the battery cell 40, high heat dissipation can be maintained even during charging and discharging.
  • the side surface of the battery cell 40 may be brought into contact with the heat radiating structure 4.
  • FIG. 8A shows the manufacturing process of the heat radiating member according to the modified example 1 and the front view of the heat radiating member.
  • FIG. 8B shows a front view of the heat radiating member according to the second modification.
  • the heat radiating member 2 according to the modified example 1 has a form in which the sheet 1 having the same structure as the sheet 1 in FIG. 3C is rolled in an arc shape in the width direction. By bending both sides of the sheet 1 in the width direction in the direction of the arrow F, the sheet 1 becomes a heat radiating member 2 having an arc-shaped rounded shape.
  • the heat radiating member 2 is flangeless.
  • the coating layer 10 contains a liquid or semi-solid heat conductive member 20 inside. In FIGS. 8A, 8B and 8C, the heat conductive member 20 is drawn by a dotted line because it is enclosed inside the covering layer 10.
  • the cross-sectional shape of the heat radiating member 2 is substantially rectangular.
  • the covering layer 10 is preferably configured such that the thickness of the outer surface rounded in an arc shape is thinner than the thickness of the inner surface rounded in an arc shape.
  • the shape of the heat radiating member 2 is not a completely closed cylinder, but a tubular body having a slit 50 in a part thereof. When the heat radiating member 2 is arranged so that the slit 50 faces the bottom 32 and the side opposite to the slit 50 faces the battery cell 40 in the battery 30, the heat radiating member 2 receives a load in the direction of arrow G from the battery cell 40. It deforms into a flat shape. The heat from the battery cell 40 is transferred to the bottom 42 along the heat channels L1 and L2.
  • the heat radiating member 2 according to the modification 2 has a shape in which the alphabet C is turned inside out.
  • the heat radiating member 2 according to the modified example 2 has the same form as the modified example 1 in which the sheet 1 is rolled in an arc shape, and the slit 51 is wider than the slit 50 described above.
  • the heat radiating structure 2 according to the modification 2 is deformed in a flat shape between the battery cell 40 and the bottom portion 32. The heat from the battery cell 40 is transferred to the bottom 32 along the heat flow path L1.
  • the sheet 1 according to the modified examples 1 and 2 may be replaced with any sheet 1 having the structures shown in FIGS. 1A, 2A, 2B and 2C.
  • the covering layer 10 includes a flange 11 provided on at least one of the width directions of the sheet 10 and a bag body 15 closed by the flange 11, and the heat conductive member 20 is present inside the bag body 15. Is also good.
  • the heat conductive member 20 may be a liquid or a fluid semi-solid body.
  • the liquid or semi-solid body may contain a carbon filler.
  • the heat conductive member 20 may include a liquid or a semi-solid body arranged on the outside rolled in an arc shape and a solid plate arranged on the inside arranged in an arc shape.
  • a high adhesion means for enhancing the adhesion between the coating layer 10 and the heat conductive member 20 may be provided between the coating layer 10 and the heat conductive member 20.
  • the heat radiating structures 3 and 4 and the battery 30 may be provided with the heat radiating member 2 according to the modified examples 1 and 2.
  • the flanges 11 are not provided on both sides of the sheet 1 in the width direction, but may be provided only on one side in the width direction, or may be provided at a total of four locations in the width direction and the length direction.
  • the bag body 15 is preferably in a sealed state when a liquid or semi-solid heat conductive member 20 is contained therein. However, when the solid plate 25 is provided inside the bag body 15 without including the heat conductive member 20, the bag body 15 may have a hole leading to the outside.
  • the heat source includes not only the battery cell 40 but also all objects that generate heat such as a circuit board and an electronic device body.
  • the heat source may be an electronic component such as a capacitor and an IC chip.
  • the cooling medium 35 may be not only cooling water but also an organic solvent, liquid nitrogen, or a cooling gas. Only one heat radiating member 2 may be provided in the battery 30. Further, the heat dissipation structures 3 and 4 may be arranged in a structure other than the battery 30, for example, an electronic device, a home appliance, a power generation device, or the like.
  • the electronic device includes a circuit board including electronic components and a heat sink arranged on a surface (rear surface) opposite to the electronic components of the circuit board, and is described above between the circuit board and the heat sink.
  • the heat radiating member 2 or the heat radiating structures 3 and 4 may be interposed.
  • the electronic device includes a circuit board including electronic components and a heat sink arranged on a surface (surface) of the circuit board on the electronic component side, and the heat radiation member 2 or heat dissipation described above is provided between the electronic components and the heat sink. Structures 3 and 4 may be interposed.
  • the sheet 1 does not necessarily have to be long.
  • the plurality of components of each of the above-described embodiments and modifications can be freely combined except when they cannot be combined with each other.
  • the heat radiating member 2 according to various modifications shown in FIGS. 3A, 3B, 3C, 3D and 3E can be provided in the heat radiating structures 3 and 4 or the battery 30.
  • the present invention can be used in fields where it is necessary to enhance heat conduction from a heat source to a cooling portion or heat conduction between heat sources.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

Le problème décrit par la présente invention est de fournir : un élément de dissipation de chaleur qui peut être adapté à diverses formes de source de chaleur, a une excellente déformabilité élastique, et a des propriétés de dissipation de chaleur élevées et des propriétés d'isolation électrique élevées ; une structure de dissipation de chaleur ; et une batterie.　La solution selon l'invention concerne : un élément de dissipation de chaleur 2 pour améliorer la dissipation de chaleur à partir d'une source de chaleur, l'élément de dissipation de chaleur 2 ayant une forme dans laquelle une feuille 1 est incurvée selon une forme arquée, la feuille comportant un élément de conduction de chaleur 20 et une couche de revêtement 10 recouvrant l'extérieur de l'élément de conduction de chaleur 20 ; une structure de dissipation de chaleur comprenant deux éléments de dissipation de chaleur ou plus 2 ; et une batterie comprenant un élément de dissipation de chaleur 2.
PCT/JP2021/025426 2020-08-12 2021-07-06 Élément de dissipation de chaleur, structure de dissipation de chaleur et batterie WO2022034759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-136210 2020-08-12
JP2020136210 2020-08-12

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Publication Number Publication Date
WO2022034759A1 true WO2022034759A1 (fr) 2022-02-17

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012048905A (ja) * 2010-08-25 2012-03-08 Hitachi Ltd 冷却材を備える電池、並びに冷却材を備える組電池
JP2015090750A (ja) * 2013-11-05 2015-05-11 信越ポリマー株式会社 熱伝導デバイス及びバッテリーモジュール
JP2019125665A (ja) * 2018-01-16 2019-07-25 信越ポリマー株式会社 放熱構造体およびそれを備えるバッテリー
WO2020105377A1 (fr) * 2018-11-21 2020-05-28 信越ポリマー株式会社 Structure de dissipation de chaleur et batterie la comprenant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012048905A (ja) * 2010-08-25 2012-03-08 Hitachi Ltd 冷却材を備える電池、並びに冷却材を備える組電池
JP2015090750A (ja) * 2013-11-05 2015-05-11 信越ポリマー株式会社 熱伝導デバイス及びバッテリーモジュール
JP2019125665A (ja) * 2018-01-16 2019-07-25 信越ポリマー株式会社 放熱構造体およびそれを備えるバッテリー
WO2020105377A1 (fr) * 2018-11-21 2020-05-28 信越ポリマー株式会社 Structure de dissipation de chaleur et batterie la comprenant

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