JP7399764B2 - Heat dissipation structure and battery equipped with the same - Google Patents

Description

The present invention relates to a heat dissipation structure and a battery including the same.

Control systems for automobiles, aircraft, ships, and household and commercial electronic equipment are becoming more precise and complex, and as a result, the integration density of small electronic components on circuit boards continues to increase. . As a result, there is a strong desire to solve the problems of failure and shortened life of electronic components due to heat generation around circuit boards.

In order to quickly dissipate heat from a circuit board, conventional methods have been used, either singly or in combination, such as constructing the circuit board itself from a material with excellent heat dissipation properties, attaching a heat sink, or driving a cooling fan. It is being done. Among these methods, methods in which the circuit board itself is made of a material with excellent heat dissipation properties, such as diamond, aluminum nitride (AlN), cubic boron nitride (cBN), etc., make the cost of the circuit board extremely high. Further, the arrangement of the cooling fan causes problems such as failure of the rotating device called the fan, the necessity of maintenance to prevent failure, and difficulty in securing installation space. On the other hand, heat dissipation fins are simple products that increase heat dissipation by increasing the surface area by forming many columnar or flat plate-like protrusions made of metal with high thermal conductivity (e.g. aluminum). Since it is a material that is suitable for use in heat dissipation, it is commonly used as a heat dissipation component (see Patent Document 1).

Incidentally, there is currently an active movement around the world to gradually convert conventional gasoline or diesel vehicles to electric vehicles with the aim of reducing the burden on the global environment. In particular, electric vehicles are becoming more popular in European countries such as France, the Netherlands, and Germany, as well as in China. The spread of electric vehicles requires the development of high-performance batteries and the installation of numerous charging stations. In particular, it is important to develop technology to improve the charging and discharging functions of lithium-based automotive batteries. It is well known that the above-mentioned automobile batteries cannot fully exhibit their charging and discharging functions at high temperatures of 60 degrees Celsius or higher. For this reason, as with the circuit board described above, it is important to improve heat dissipation in batteries as well.

In order to quickly dissipate heat from the battery, a water cooling pipe is placed in a metal case with excellent thermal conductivity such as aluminum, and a large number of battery cells are placed in the case, and the battery cells and the bottom of the case are A structure is adopted in which an adhesive rubber sheet is sandwiched between the two. In a battery having such a structure, heat is transferred from the battery cells to the housing through the rubber sheet, and the heat is effectively removed by water cooling.

JP2008-243999

However, in conventional batteries as described above, the rubber sheet has lower thermal conductivity than aluminum or graphite, making it difficult to efficiently transfer heat from the battery cells to the casing. Another option is to insert a spacer such as graphite instead of a rubber sheet, but since the bottom surfaces of multiple battery cells are not flat and have steps, a gap is created between the battery cells and the spacer, which reduces heat transfer efficiency. descend. As seen in this example, battery cells can take various forms (including unevenness such as steps or non-smooth surface conditions), so it is possible to adapt to various forms of battery cells and achieve high heat transfer efficiency. There is a growing demand for this to become a reality. Furthermore, in order to achieve high heat transfer efficiency, it is desirable to radiate heat uniformly from each of the many battery cells so that the temperature of the many battery cells becomes uniform. Furthermore, there is a demand for lighter and more elastically deformable materials for battery cell containers, and a heat dissipation structure that returns to its original shape when the battery cell is lighter and the battery cell is removed is also desired. ing.

In view of the above issues, prior to filing this application, the applicant has developed a heat dissipation structure having the following configuration, and filed a patent application (Japanese Patent Application No. 2018-218082) and an international application based on the Paris Convention priority right ( PCT/JP2019/042192).
A heat dissipation structure in which a plurality of heat dissipation members are connected to increase heat dissipation from a heat source,
The heat dissipation member is
a heat conductive sheet having a spirally wound shape for transmitting heat from the heat source;
a cushion member provided on the annular back surface of the heat conductive sheet and more easily deformed to match the surface shape of the heat source than the heat conductive sheet;
a through path that penetrates in the direction in which the thermally conductive sheet advances while being wound;
Equipped with
A heat radiating structure in which the plurality of heat radiating members are connected by a connecting member while being lined up in a direction perpendicular to a direction in which the heat conductive sheet moves while being wound.
The heat dissipation structure is a member having excellent heat dissipation properties and flexibility, and is also required to be able to easily and reliably position the heat dissipation structure and the heat source. This applies not only to battery cells, but also to other heat sources such as circuit boards, electronic components, or the electronic device itself.

The present invention has been made in view of the above problems, and is adaptable to various forms of heat sources, is lightweight, has excellent elastic deformability, has excellent heat dissipation efficiency, and has uniform heat dissipation properties for each of a plurality of heat sources. It is an object of the present invention to provide a heat dissipation structure that can increase heat dissipation and position with a heat source easily and reliably, and a battery equipped with the same.

(1) A heat dissipation structure according to an embodiment for achieving the above object is a heat dissipation structure in which a plurality of heat dissipation members are connected to enhance heat dissipation from a heat source, and the heat dissipation member is configured to increase heat dissipation from the heat source. A heat conductive sheet that is spirally wound and progresses to transmit heat, and a cushion that is provided on the annular back surface of the heat conductive sheet and that is more easily deformed to match the surface shape of the heat source than the heat conductive sheet. A fixing member comprising a member and a through path penetrating in the direction in which the heat conductive sheet advances while being wound, and is capable of fixing the plurality of heat dissipating members in a state in which they are arranged in a direction perpendicular to the longitudinal direction thereof. The fixing member is a substantially L-shaped member including one side along the longitudinal direction and one side along the direction orthogonal to the longitudinal direction among four sides surrounding the plurality of heat radiating members.
(2) In the heat dissipation structure according to another embodiment, preferably, the plurality of heat dissipation members are arranged in a direction orthogonal to the longitudinal direction, and at least one end of the plurality of heat dissipation members in the longitudinal direction is A connecting member for connecting may be provided.
(3) In the heat dissipation structure according to another embodiment, preferably, the connecting member connects at least one end of the plurality of heat dissipation members in the longitudinal direction along a direction perpendicular to the longitudinal direction of the fixing member. They may be fixed on one side and connected.
(4) In the heat dissipation structure according to another embodiment, preferably, the connecting member may be made of thread.
(5) The heat dissipation structure according to another embodiment is preferably configured to be able to fit with the other adjacent heat dissipation structure, and the fixing member is the fixing member of the other heat dissipation structure. It may also include a fitting part that can be fitted with.
(6) In the heat dissipation structure according to another embodiment, preferably, the fixing member may be formed to have a thickness thinner than the thickness of the heat dissipation member deformed by pressure from the heat source.
(7) In the heat dissipation structure according to another embodiment, preferably, the cushion member is a cylindrical cushion member having the through passage in the longitudinal direction, and the heat conductive sheet is a cylindrical cushion member that The outer surface of the member may be spirally wound.
(8) In the heat dissipation structure according to another embodiment, preferably, the cushion member may be a spiral cushion member wound spirally along the annular back surface of the heat conductive sheet.
(9) In the heat dissipation structure according to another embodiment, the surface of the heat conductive sheet preferably includes a heat conductive oil for increasing thermal conductivity from a heat source in contact with the surface to the surface. It's okay.
(10) In the heat dissipation structure according to another embodiment, preferably, the thermally conductive oil is made of silicone oil and one or more of metals, ceramics, and carbon, which has higher thermal conductivity than the silicone oil. It may also contain a sexual filler.
(11) The battery according to one embodiment is a battery that includes one or more battery cells as a heat source in a housing having a structure in which a cooling member flows, and wherein the battery cell is disposed between the battery cell and the housing. is provided with any of the heat dissipation structures described above.

According to the present invention, it is adaptable to various forms of heat sources, is lightweight, has excellent elastic deformability, has excellent heat dissipation efficiency, improves the uniformity of heat dissipation in each of a plurality of heat sources, and It is possible to provide a heat dissipation structure that can be easily and reliably positioned, and a battery equipped with the same.

FIG. 1 shows a plan view of a heat dissipation structure according to a first embodiment. FIG. 2 shows a cross-sectional view taken along the line AA in FIG. 1 and an enlarged view of a portion C thereof. FIG. 3 shows a side view of the heat dissipation structure shown in FIG. 1 as viewed from the direction of arrow B, and an enlarged view of a portion D thereof. FIG. 4 shows a plan view of a heat dissipation structure according to the second embodiment. FIG. 5 shows a plan view and an enlarged view of a part E of the heat dissipation structure assembly according to the second embodiment, respectively. FIG. 6 shows a part of Modified Example 1 of the heat dissipation structure according to the second embodiment in an enlarged view and the same view as in FIG. 5 . FIG. 7 shows a part of Modified Example 2 of the heat dissipation structure according to the second embodiment in an enlarged view and the same view as in FIG. 5 . FIG. 8 shows diagrams for explaining the manufacturing process of the heat radiating member that constitutes the heat radiating structure. FIG. 9 shows a diagram for explaining a preferred manufacturing process of a modified example of the heat dissipation member constituting the heat dissipation structure. FIG. 10 shows a longitudinal cross-sectional view of a battery including a heat dissipation structure. Figure 11 shows a cross-sectional view of a battery cell placed horizontally on a heat dissipation structure with its side surfaces in contact with each other, a partially enlarged view of the cross-sectional view, and a partial cross-sectional view of the battery cell expanded during charging and discharging. Each is shown below.

Next, each embodiment of the present invention will be described with reference to the drawings. It should be noted that each embodiment described below does not limit the claimed invention, and all of the various elements and combinations thereof described in each embodiment are the solution of the present invention. is not necessarily required.

1. Heat dissipation structure (first embodiment)
FIG. 1 shows a plan view of a heat dissipation structure according to a first embodiment. FIG. 2 shows a cross-sectional view taken along the line AA in FIG. 1 and an enlarged view of a portion C thereof. FIG. 3 shows a side view of the heat dissipation structure shown in FIG. 1 as viewed from the direction of arrow B, and an enlarged view of a portion D thereof. In this embodiment, the longitudinal direction of the heat dissipation member is the Y direction, and the direction orthogonal to the longitudinal direction is the X direction (see FIG. 1). Further, in this embodiment, the heat source is arranged above the paper plane of FIGS. 2 and 3, and the cooling member is arranged below the paper plane of FIGS. 2 and 3. The same applies to subsequent embodiments.

(1) General configuration The heat dissipation structure 1 according to the first embodiment is a member in which a plurality of heat dissipation members 20 are connected to each other to enhance heat dissipation from a heat source. The heat dissipation member 20 is provided with a heat conductive sheet 21 having a spirally wound shape that advances while transmitting heat from the heat source, and an annular back surface of the heat conductive sheet 21, and is provided on the annular back surface of the heat conductive sheet 21. It includes a cushion member 22 that can be easily deformed according to the shape, and a through path 23 that penetrates in the direction in which the heat conductive sheet 21 advances while being wound. Furthermore, the heat radiation structure 1 includes a fixing member 10 that can fix a plurality of heat radiation members 20 in a state in which they are arranged in a direction perpendicular to the longitudinal direction of the heat radiation members 20 (X direction shown in FIG. 1). The fixing member 10 has a substantially L-shape that is composed of one side along the longitudinal direction (the Y direction shown in FIG. 1) and one side along the direction orthogonal to the longitudinal direction among the four sides surrounding the plurality of heat dissipating members 20. It is a member. The heat dissipation member 20 may also be referred to as a "thermal conduction member" or a "heat transfer member."

(2) Thermal conductive sheet The thermally conductive sheet 21 may be made of any material, but is preferably a sheet containing carbon, more preferably a sheet composed of 90% by mass or more of carbon. For example, the heat conductive sheet 21 may be a graphite film made of fired resin. However, the heat conductive sheet 21 may be a sheet containing carbon and resin. In that case, the resin may be synthetic fiber, and in that case, aramid fiber can be suitably used as the resin. "Carbon" in this application has a broad definition that includes any structure made of carbon (element symbol: C) such as graphite, carbon black with lower crystallinity than graphite, diamond, and diamond-like carbon with a structure similar to diamond. be interpreted as In this embodiment, the heat conductive sheet 21 can be a thin sheet made of a hardened material in which graphite fibers and carbon particles are blended and dispersed in resin. The thermally conductive sheet 21 may be made of carbon fiber knitted into a mesh shape, or may be blended or knitted. Note that various fillers such as graphite fibers, carbon particles, and carbon fibers are all included in the concept of carbon filler.

When the thermally conductive sheet 21 is a sheet comprising carbon and resin, the resin may be more than 50% by mass or less than 50% by mass based on the total mass of the thermally conductive sheet 21. . That is, the heat conductive sheet 21 may be made of resin or not, as long as there is no major problem in heat conduction. As the resin, for example, thermoplastic resin can be suitably used. The thermoplastic resin is preferably a resin with a high melting point that does not melt when conducting heat from a heat source, such as polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamideimide (PAI), aromatic Preferred examples include group polyamides (aramid fibers). The resin is dispersed, for example, in the form of particles or fibers in the gaps between the carbon fillers before the thermally conductive sheet 21 is formed. In addition to carbon filler and resin, the heat conductive sheet 21 may have AlN or diamond dispersed therein as a filler to further enhance heat conduction. Furthermore, instead of resin, an elastomer that is more flexible than resin may be used. The thermally conductive sheet 21 may also be a sheet containing metal and/or ceramics instead of or in addition to carbon as described above. As the metal, a metal having relatively high thermal conductivity such as aluminum, copper, or an alloy containing at least one of them can be selected. Moreover, as the ceramic, one having relatively high thermal conductivity such as Al ₂ O ₃ , AlN, cBN, hBN, etc. can be selected.

It does not matter whether the thermally conductive sheet 21 has excellent electrical conductivity or not. The thermal conductivity of the thermally conductive sheet 21 is preferably 10 W/mK or more. In this embodiment, the thermally conductive sheet 21 is preferably a graphite film, and is made of a material with excellent thermal conductivity and electrical conductivity. The thermally conductive sheet 21 is preferably a sheet with excellent curvature (or flexibility), and its thickness is not limited, but is preferably 0.02 to 3 mm, more preferably 0.03 to 0.5 mm. However, the thermal conductivity of the thermally conductive sheet 21 decreases in the thickness direction as the thickness increases, but the amount of heat transfer increases as the thickness increases, so the strength, flexibility, and thermal conductivity of the sheet are It is preferable to decide the thickness by taking comprehensive consideration.

(3) Cushion member The important functions of the cushion member 22 are ease of deformation and resilience. The recovery force is due to elastic deformability. Ease of deformation is a necessary property to follow the shape of the heat source, especially for battery cells such as lithium-ion batteries whose semi-solid or liquid contents are housed in easily deformable packages. In this case, the design dimensions are often irregular or dimensional accuracy cannot be achieved. Therefore, it is important to maintain the resilience of the cushion member 22 to maintain its deformability and follow-up force.

The cushion member 22 is a cylindrical cushion member including a through passage 23 in this embodiment. The cushion member 22 makes good contact between the heat conductive sheet 21 and the heat source even when the heat source that contacts the heat conductive sheet 21 is not flat. Furthermore, the through passage 23 has the function of facilitating deformation of the cushion member 22, contributing to weight reduction of the heat dissipation structure 1, and increasing contact between the heat conductive sheet 21 and the heat source. The cushion member 22 also has a function as a protection member that prevents the heat conductive sheet 21 from being damaged due to the load applied to the heat conductive sheet 21. In this embodiment, the cushion member 22 is a member with lower thermal conductivity than the thermally conductive sheet 21. In this embodiment, the through passage 23 is formed to have a circular cross section, but the cross sectional shape of the through passage 23 is not limited to a circle, and may be, for example, polygonal, elliptical, semicircular, or with a rounded apex. It may also be a substantially curved polygon. Further, the through-path 23 may be composed of a plurality of through-paths, such as a through-path with a circular cross-section divided into two halves vertically or horizontally, each having a semicircular cross-section.

The cushion member 22 is preferably made of a thermosetting 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, etc. thermoplastic elastomers, or composites thereof. The cushion member 22 is preferably made of a material with high heat resistance that allows it to maintain its shape without melting or decomposing due to the heat transmitted through the heat conductive sheet 21. In this embodiment, the cushion member 22 is more preferably made of a urethane elastomer impregnated with silicone or silicone rubber. The cushion member 22 may be configured by dispersing filler such as AlN, cBN, hBN, diamond particles, etc. in rubber in order to increase its thermal conductivity as much as possible. The cushion member 22 may contain air bubbles or may not contain air bubbles. In addition, the term "cushion member" refers to a member that is highly flexible and can be elastically deformed so as to be in close contact with the surface of a heat source, and in this sense, it can also be read as a "rubber-like elastic body." Further, as a modification of the cushion member 22, it may be constructed using metal instead of the rubber-like elastic body described above. For example, the cushion member 22 may be made of spring steel. Furthermore, it is also possible to arrange a coil spring as the cushion member 22. Alternatively, a spirally wound metal may be made of spring steel and placed on the annular back surface of the heat conductive sheet 21 as a cushion member. Further, the cushion member 22 can also be made of a sponge or solid (having a non-porous structure like a sponge) made of resin, rubber, or the like.

(4) Connecting member The connecting member 30 is preferably a member that connects the plurality of heat radiating members 20 in a state where they are arranged in a direction perpendicular to the longitudinal direction. The connecting member 30 is preferably a member that connects at least one longitudinal end of the plurality of heat radiating members 20, and more preferably a member that connects at least both ends of the plurality of heat radiating members 20 in the longitudinal direction. The connecting member 30 is a member made of a material such as thread or rubber, in which at least a portion located between the plurality of heat dissipating members 20 is deformable. The connecting member 30 is preferably made of thread, and more preferably is a thread that can withstand temperature increases due to heat dissipation from the heat source. More specifically, the connecting member 30 is preferably made of twisted yarn that can withstand high temperatures of about 120° C. and is made of fibers such as natural fibers, synthetic fibers, carbon fibers, and metal fibers. In this embodiment, the connecting member 30 is a member that connects a plurality of heat dissipating members 20 to a fixing member 10, which will be described later, by sewing them using a sewing machine or the like. The method of sewing the connecting member 30 is not particularly limited, and may be any sewing method such as hand stitching, lock stitching, zigzag stitching, single chain stitching, double chain stitching, overedge stitching, flat stitching, safety stitching, overlock stitching, etc. Furthermore, according to the display symbols stipulated by JIS L 0120, suitable sewing methods include "101", "209", "301", "304", "401", "406", "407", and "410". ”, “501”, “502”, “503”, “504”, “505”, “509”, “512”, “514”, “602” and “605”. I can give an example. In the heat dissipation structure 1, even if the heat dissipation member 20 is compressed and becomes flat due to the pressure from the heat source, the connecting member 30 bends following the deformation of the heat dissipation member 20, so that it cannot follow and adhere closely to the heat source. can.

(5) Fixing member When the plurality of heat radiating members 20 are lined up along the direction orthogonal to the longitudinal direction, the fixing member 10 has one side along the longitudinal direction and one side of the four sides surrounding the plurality of heat radiating members 20. It is a substantially L-shaped member composed of one side along a direction (short side direction) orthogonal to the main body. In this embodiment, as shown in FIG. 1, the fixing member 10 has one side on the left side along the longitudinal direction (the Y direction shown in FIG. 1) among the four sides surrounding the plurality of heat dissipating members 20, and It is a substantially L-shaped member that is formed from one lower side along the direction (X direction shown in FIG. 1). Note that there is no particular restriction on the fixing member 10 as long as it is composed of one side along the longitudinal direction and one side along the direction orthogonal to the longitudinal direction among the four sides surrounding the plurality of heat dissipating members 20. For example, one side on the right side and one side of the upper side. The two sides forming the substantially L-shape of the fixing member 10 may have the same width, or the two sides may have different widths.

Preferably, the fixing member 10 is configured such that one end of the plurality of heat radiating members 20 in the longitudinal direction is placed on one side along a direction perpendicular to the longitudinal direction, and the one side is mounted on a sewing machine or the like together with the plurality of heat radiating members 20. The connection member 30 is sewn using the connecting member 30. In this way, the connecting member 30 fixes and connects one longitudinal end of the plurality of heat radiating members 20 to one side of the fixing member 10 along the direction orthogonal to the longitudinal direction. Further, preferably, one longitudinal side of the fixing member 10 is connected to the connecting member 30 by using a sewing machine or the like together with the other longitudinal end of the plurality of heat dissipating members 20 (for example, the upper end shown in FIG. 1). It can be sewn with. In this way, the plurality of heat radiating members 20 are connected by the fixing member 10 and the connecting member 30. Further, the fixing member 10 is preferably arranged such that one side along the longitudinal direction overlaps the end portion of the heat dissipation member 20 in the transverse direction. Note that the fixing member 10 may be arranged such that one side along the longitudinal direction is inside the end portion of the heat dissipation member 20 in the transverse direction. Moreover, it is preferable that the fixing member 10 has a substantially L-shaped space in which the plurality of heat radiating members 20 are arranged, and has a sufficient size to allow the heat source to pass therethrough. However, the space may be of such a size that the heat source cannot be inserted therethrough. The fixing member 10 is preferably made of resin or rubber, and more preferably made of PET film.

In the heat dissipation structure 1, the plurality of heat dissipation members 20 are connected and fixed by the fixing member 10 and the connection member 30, so that the plurality of heat dissipation members 20 in the heat dissipation structure 1 can be positioned. In order to achieve high heat transfer efficiency, it is desirable to radiate heat uniformly from each of the multiple heat sources so that the temperature of each of the multiple heat sources becomes uniform. For this purpose, it is preferable to arrange a plurality of heat radiating members 20 so that the number of heat radiating members 20 in contact with each heat source is uniform. As described above, in the heat radiating structure 1, the plurality of heat radiating members 20 are positioned by the fixing member 10 and the connecting member 30, so that the heat radiating members 20 can be reliably brought into contact with each heat source. Therefore, the heat dissipation structure 1 can improve the uniformity of heat dissipation in each of the many heat sources, and can realize high heat transfer efficiency. Note that the fixing member 10 is not limited to resin or rubber, and may be made of metal, plastic, wood, ceramics, etc., as long as it does not deform due to heat radiation from the heat source.

The distance L1 between the heat radiating members 20 becomes narrower when the heat radiating members 20 are crushed under pressure from the heat source. If the heat dissipation member 20 is hardly crushed, there is a possibility that the adhesion between the heat conductive sheet 21 and the heat source etc. will be reduced. The thickness of the heat dissipating member 20 when compressed in the vertical direction, that is, in the direction from the heat source to the cooling part provided with the cooling member, is at least the tube diameter of the heat dissipating member 20 (=circular equivalent diameter) to reduce this risk. :D) is 80%. Here, the "circular equivalent diameter" means the diameter of a perfect circle having the same area as the area of the tube cross section when the heat radiating member 20 is cut perpendicularly to its longitudinal direction. When the heat dissipation member 20 is a cylinder with a perfect circular cross section, its diameter is the same as the equivalent circle diameter. When the heat dissipation member 20 is subjected to the above compression, it can be considered that the heat dissipation member 20 deforms so that the surface in contact with the heat source and the cooling part becomes a plane, and the direction of the distance L1 between the heat dissipation members 20 becomes a substantially arc cross section (as shown in FIG. 2C). (see enlarged view). If the distance L1 is made sufficiently large, the heat radiating member 20 will not come into contact with the adjacent heat radiating member 20. On the other hand, if the gap L1 is too small, even if the heat radiating member 20 is compressed in the vertical direction, it may come into contact with an adjacent heat radiating member 20 and may not be crushed any further. If the distance L1 is set to 11.4% or more of the circular diameter D of the heat dissipating member 20, the heat dissipating members 20 will come into contact with each other when the heat dissipating member 20 is compressed and deformed to a thickness of 80% of the circular diameter D. This can prevent the deformation from becoming an obstacle. Therefore, in the heat dissipation structure 1, it is preferable that the plurality of heat dissipation members 20 are arranged such that the distance L1 between the heat dissipation members 20 is 11.4% or more of the equivalent circular diameter D of the heat dissipation members 20. However, the smaller the distance L1 is, the more stably the plurality of heat radiating members 20 can be connected when connected by the connecting member 30. It is more preferable to set the distance L1 in consideration of these points. Note that in this embodiment, the distance L1 is 0.114D.

The fixing member 10 is preferably formed so that its thickness T1 is thinner than the thickness (0.8D) of the heat dissipating member 20 deformed by the pressure from the heat source (see the enlarged view of FIG. 3D). By configuring the heat dissipation structure 1 in this way, even if the heat dissipation member 20 is compressed in the vertical direction due to pressure from the heat source, it is possible to suppress the possibility that the heat source will come into contact with the fixing member 10 and not be crushed further, and the heat dissipation When the member 20 is compressed and deformed to a thickness of 80% of the equivalent circular diameter D, it can be prevented from becoming an obstacle to the deformation. Note that it is preferable that the surface of the heat dissipating member 20 on the cooling site side (lower side in FIG. 3) be at the same height as the surface of the fixing member 10 on the cooling site side, or that it slightly protrudes toward the cooling site. This is because it is easier to bring the fixing member 10 into contact with the cooling region.

(6) Thermal conductive oil The thermally conductive oil preferably includes silicone oil and a thermally conductive filler that has higher thermal conductivity than silicone oil and is made of one or more of metals, ceramics, or carbon. The thermally conductive sheet 21 has microscopic gaps (holes or recesses). Usually, air exists in the gap, which may have an adverse effect on thermal conductivity. The thermally conductive oil fills the gap and exists in place of air, and has the function of improving the thermal conductivity of the thermally conductive sheet 21.

The thermally conductive oil is provided on the surface of the thermally conductive sheet 21, at least on the surface where the heat source and the thermally conductive sheet 21 come into contact. In the present application, "oil" of thermally conductive oil refers to a water-insoluble combustible substance that is liquid or semi-solid at room temperature (any temperature in the range of 20 to 25° C.). Instead of the word "oil", "grease" or "wax" can also be used. Thermal conductive oil is an oil that does not impede heat conduction when heat is transferred from the heat source to the heat conductive sheet 21. Hydrocarbon oil and silicone oil can be used as the thermally conductive oil. The thermally conductive oil preferably includes silicone oil and a thermally conductive filler that has higher thermal conductivity than silicone oil and is made of one or more of metals, ceramics, or carbon.

The silicone oil preferably consists of molecules with a linear structure having 2000 or less siloxane bonds. Silicone oil is broadly classified into straight silicone oil and modified silicone oil. Examples of straight silicone oil include dimethyl silicone oil, methylphenyl 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 various silicone oils such as amino-modified type, epoxy-modified type, carboxy-modified type, carbinol-modified type, methacrylic-modified type, mercapto-modified type, and phenol-modified type. Non-reactive silicone oils include various silicone oils such as polyether-modified types, methylstyryl-modified types, alkyl-modified types, higher fatty acid ester-modified types, hydrophilic specially modified types, higher fatty acid-containing types, and fluorine-modified types. Silicone oil is an oil with excellent heat resistance, cold resistance, viscosity stability, and thermal conductivity, so it is applied to the surface of the heat conductive sheet 21 to provide heat conduction between the heat source and the heat conductive sheet 21. It is particularly suitable as a sex oil.

The thermally conductive oil preferably contains, in addition to oil, a thermally conductive filler made of one or more of metals, ceramics, and carbon. Examples of metals include gold, silver, copper, aluminum, beryllium, and tungsten. Examples of ceramics include alumina, aluminum nitride, cubic boron nitride, hexagonal boron nitride, and the like. Examples of carbon include diamond, graphite, diamond-like carbon, amorphous carbon, and carbon nanotubes.

The thermally conductive oil is preferably interposed not only between the heat source and the thermally conductive sheet 21 but also between the thermally conductive sheet 21 and a battery casing, which will be described later. The thermally conductive oil may be applied to the entire surface of the thermally conductive sheet 21 or to a portion of the thermally conductive sheet 21. There are no particular restrictions on the method of making the thermally conductive oil present in the thermally conductive sheet 21, and any method may be used, such as spraying with a sprayer, application using a brush, etc., or dipping the thermally conductive sheet 21 into the thermally conductive oil. It may also be based on Note that the thermally conductive oil is not an essential component for the heat dissipation structure 1 or the battery described below, but is an additional component that can be suitably provided. This also applies to subsequent embodiments.

In the heat dissipation structure 1, both ends of the plurality of heat dissipation members 20 in the longitudinal direction are connected and fixed by a fixing member 10 and a connecting member 30. As a result, both ends of the heat dissipating member 20 in the longitudinal direction are crushed under pressure from the heat sources in a connected state, so even if the lower ends of the plurality of heat sources are not flat, the thermal conductive sheet 21 and the lower ends thereof are Good contact. In the heat dissipation structure 1, since the heat dissipation members 20 are positioned by the fixing member 10 and the connecting member 30, the variation in the distance L1 between the heat dissipation members 20 is reduced even when the heat dissipation structure 1 is crushed under pressure from a heat source. Therefore, the heat dissipation structure 1 can improve the uniformity of heat dissipation in each of the multiple heat sources. Moreover, since each heat dissipation member 20 of the heat dissipation structure 1 has a structure in which the heat conductive sheet 21 is spirally wound around the outer surface of the cushion member 22, deformation of the cushion member 22 is not excessively restrained. Note that the plurality of heat radiating members 20 are not limited to being arranged so that the distance L1 between the heat radiating members 20 is equal. The heat dissipation structure 1 is preferably arranged with a distance L1 varied so that the heat dissipation members 20 are concentrated at the position of the heat source with the highest temperature among the plurality of heat sources. That is, the heat dissipation structure 1 is arranged such that the number of heat dissipation members 20 that come into contact with a high temperature heat source is greater than the number of heat dissipation members 20 that come into contact with other heat sources. It is preferable to make the distance L1 small. In this manner, the heat dissipation structure 1 can be easily and reliably positioned with respect to the heat sources so that the heat dissipation properties of each of the plurality of heat sources are uniform, depending on the form of the heat sources and the like.

(Second embodiment)
Next, a heat dissipation structure according to a second embodiment will be described. Portions common to those in the previous embodiment are given the same reference numerals and redundant explanation will be omitted.

FIG. 4 shows a plan view of a heat dissipation structure according to the second embodiment. FIG. 5 shows a plan view and an enlarged view of a part E of the heat dissipation structure assembly according to the second embodiment, respectively.

The heat dissipation structure 1a according to the second embodiment has a similar structure to the heat dissipation structure 1 according to the first embodiment, but is different from the first embodiment in that it includes a fixing member 10a instead of the fixing member 10. This is different from the heat dissipation structure 1.

The heat dissipation structure 1a is configured to be able to fit into another heat dissipation structure 1a. That is, the heat dissipation structure 1a can form a heat dissipation structure assembly 70 (hereinafter also simply referred to as "aggregate 70") by fitting with a plurality of other heat dissipation structures 1a ( (see Figure 5). The assembly 70 formed in this manner can ensure that the lower ends of the heat sources are in contact with the heat conductive sheet 21 even if the lower ends of the plurality of heat sources have a large area. Therefore, the heat dissipation structure 1a can be fitted with at least one other heat dissipation structure 1a to form the assembly 70, depending on the area of the lower end portions of the plurality of heat sources to be heat dissipated. In addition, although the assembly 70 is formed by fitting four heat dissipation structures 1a in FIG. 5, the number of heat dissipation structures 1a forming the assembly 70 is not particularly limited.

The fixing member 10a includes a fitting part 15 that can be fitted to the fixing member 10a of another heat dissipation structure 1a. The fitting portion 15 is a portion that can be fitted to the fixing member 10a of another adjacent heat dissipation structure 1a when the heat dissipation structure 1a forms the assembly 70. In this embodiment, the fitting portion 15 is a rectangular protruding portion or a rectangular recessed portion (see FIGS. 4 and 5E). The assembly 70 includes, for example, a rectangularly protruding fitting portion 15 of the fixing member 10a of the heat dissipating structure 1a, and a rectangularly recessed fitting portion 15 of the fixing member 10a of another adjacent heat dissipating structure 1a. are formed by fitting together (so-called puzzle-like connection). Note that there are no restrictions on the position and number of the fitting portions 15 as long as they can fit with the fitting portions 15 of at least one other adjacent heat dissipation structure 1a. The configuration of the heat dissipation structure 1a other than the fixing member 10a is the same as that of the heat dissipation structure 1 according to the first embodiment, so a detailed explanation will be omitted.

FIG. 6 shows a part of Modified Example 1 of the heat dissipation structure according to the second embodiment in an enlarged view and the same view as in FIG. 5 .

In modification 1, the heat dissipation structure 1a differs from the heat dissipation structure 1a according to the second embodiment described above in that the fixing member 10a includes a fitting part 15a instead of the fitting part 15. Note that in Modification 1, the configuration other than the fitting portion 15a is the same as that of the heat dissipation structure 1a according to the second embodiment described above, and therefore detailed description thereof will be omitted. Furthermore, in Modification 1, the position and number of fitting portions 15a in fixing member 10a are the same as those of fitting portions 15 of heat dissipation structure 1a according to the second embodiment described above.

The fitting portion 15a is a substantially T-shaped protruding portion or a hole into which the substantially T-shaped protruding portion can be inserted. The heat dissipation structure assembly 70 is configured, for example, to connect the fitting portion 15a of the fixing member 10a of the heat dissipation structure 1a protruding in a substantially T-shape to the hole (fitting portion) of the fixing member 10a of another adjacent heat dissipation structure 1a. part) 15a and fit together. In this manner, also in Modification 1, the heat dissipation structure 1a can form the assembly 70 by fitting with a plurality of other heat dissipation structures 1a.

FIG. 7 shows a part of Modified Example 2 of the heat dissipation structure according to the second embodiment in an enlarged view and the same view as in FIG. 5 .

In the second modification, the heat radiation structure 1a differs from the heat radiation structure 1a according to the second embodiment described above in that the fixing member 10a includes a fitting part 15b instead of the fitting part 15. Note that in Modification 2, the configuration other than the fitting portion 15b is the same as that of the heat dissipation structure 1a according to the second embodiment described above, so detailed description thereof will be omitted. Furthermore, in the second modification, the position and number of fitting portions 15b in the fixing member 10a are the same as those of the fitting portions 15 of the heat dissipation structure 1a according to the second embodiment described above.

The fitting portion 15b is a substantially T-shaped protruding portion or a substantially T-shaped depressed portion. Preferably, the fitting portion 15b is formed so that the approximately T-shaped protruding portion is larger than the approximately T-shaped depressed portion. The heat dissipation structure assembly 70 includes, for example, a substantially T-shaped fitting portion 15b of the fixing member 10a of the heat dissipation structure 1a, and a substantially T-shaped fitting portion 15b of the fixing member 10a of another adjacent heat dissipation structure 1a. It is formed by fitting with the recessed fitting part 15b. In this manner, also in Modification 2, the heat dissipation structure 1a can form the assembly 70 by fitting with a plurality of other heat dissipation structures 1a.

2. Method for Manufacturing Heat Dissipation Structure Next, an example of a suitable method for manufacturing the heat dissipation structure 1 according to the first embodiment will be described. First, an example of a suitable method for manufacturing the heat radiating member 20 that constitutes the heat radiating structure 1 will be described.

FIG. 8 shows diagrams for explaining the manufacturing process of the heat radiating member that constitutes the heat radiating structure.

First, the cushion member 22 having the through passage 23 is molded. Next, adhesive is applied to the outer surface of the cushion member 22. Next, after winding the band-shaped heat conductive sheet 21 in a spiral shape on the outer surface of the cushion member 22, if any portion of the heat conductive sheet 21 protrudes from both ends of the cushion member 22, the protruding portion is cut. Alternatively, the entire cushion member 22 may be cut. Finally, thermally conductive oil is applied to the surface of the thermally conductive sheet 21. It is also possible to fix the cushion member 22 and the heat conductive sheet 21 without interposing an adhesive between them. In that case, the cushion member 22 is prepared before being completely cured, and the band-shaped heat conductive sheet 21 is wrapped around the outer surface of the cushion member 22. Thereafter, the cushion member 22 is heated and completely cured, and the heat conductive sheet 21 is fixed to the outer surface of the cushion member 22.

The cutting process of cutting the portions of the thermally conductive sheet 21 protruding from both ends of the cushion member 22 and the coating process of applying the thermally conductive oil are not limited to being performed at the above-mentioned timing. For example, the cutting process may be performed after the coating process.

The heat dissipation structure 1 has a plurality of heat dissipation members 20 manufactured by the above-described manufacturing method arranged in a direction perpendicular to the longitudinal direction thereof, and a fixing member 10 arranged therein, and the plurality of heat dissipation members 20 and the fixing member 10 It is manufactured by sewing and fixing with the connecting member 30. More specifically, the fixing member 10 is located at a position where one side along the direction perpendicular to the longitudinal direction (X direction shown in FIG. 1) overlaps with one end of the plurality of heat dissipating members 20 in the longitudinal direction It is preferable that the heat dissipation member 20 be disposed at a position where one side along the Y direction shown in FIG. Further, it is preferable that the connecting member 30 is sewn between both ends of the plurality of heat dissipating members 20 in the longitudinal direction and the fixing member 10 using a sewing machine or the like with the fixing member 10 disposed in this manner. Note that the heat dissipation structure 1 is constructed by arranging a plurality of heat dissipation members 20 in a direction orthogonal to the longitudinal direction thereof with the fixing member 10 arranged, and sewing the plurality of heat dissipation members 20 and the fixing member 10 together using a connecting member 30. It may be manufactured by

Similar to the heat dissipation structure 1, the heat dissipation structure 1a according to the second embodiment has a fixed member 10a in which a plurality of heat dissipation members 20 manufactured by the above-described manufacturing method are arranged in a direction perpendicular to the longitudinal direction thereof. It is manufactured by arranging the plurality of heat dissipating members 20 and the fixing member 10a and sewing and fixing them using the connecting member 30. The heat dissipation structure assembly 70 is manufactured by fitting together the fixing members 10a of the plurality of heat dissipation structures 1a manufactured as described above. The heat dissipation structure assembly 70 is formed by arranging a plurality of heat dissipation members 20 manufactured by the above-described manufacturing method in a space surrounded by the fixing members 10a that are formed by fitting together the plurality of fixing members 10a. , it may be manufactured by sewing together the plurality of heat dissipating members 20 and the plurality of fixing members 10a using the connecting member 30.

An example of a suitable manufacturing method for a modification of the heat dissipation structure 1 will be described. In this modification, the heat dissipation structure 1 described above is manufactured by the same manufacturing method as the heat dissipation structure 1, except that the heat dissipation member 20 constituting the heat dissipation structure 1 described above is replaced with a heat dissipation member 20a, so a detailed explanation will be provided. omitted. A preferred method of manufacturing the heat dissipating member 20a will be described below.

FIG. 9 shows a diagram for explaining a preferred manufacturing process of a modified example of the heat dissipation member constituting the heat dissipation structure.

First, a strip-shaped laminated sheet 28 is manufactured. In manufacturing the strip-shaped laminated sheet 28, the heat conductive sheet 21 and the cushion member 22 are preferably fixed with an adhesive. Next, the strip-shaped laminated sheet 28 is spirally wound and advanced in one direction to manufacture the elongated heat dissipation member 20a. As a manufacturing method in which no adhesive is interposed between the heat conductive sheet 21 and the cushion member 22, the following method can be exemplified. For example, the thermally conductive sheet 21 is pasted on the cushion member 22 while the cushion member 22 is in an uncured state that is not completely cured. Thereafter, the cushion member 22 is completely hardened by heating.

After the strip-shaped laminated sheet 28 is wound in a spiral shape, both ends of the laminated sheet 28 may be cut to adjust the shape. Finally, thermally conductive oil is applied to the surface of the thermally conductive sheet 21. The heat dissipation member 20a is provided with a through passage 23a that penetrates in its longitudinal direction. Unlike the heat radiating member 20 in the above-described embodiment, the through path 23a also penetrates in the direction of the outer surface of the heat radiating member 20a. In this way, the cushion member 22 is arranged inside the heat conductive sheet 21, and the heat conductive sheet 21 and the cushion member 22 have a form in which they move together in a spiral shape in one direction. Since the heat radiating member 20a has a spiral shape as a whole, it is easier to expand and contract in the longitudinal direction of the heat radiating member 20a than the heat radiating member 20 described above.

Note that the heat radiation structure 1a may also include a heat radiation member 20a instead of the heat radiation member 20. In this case, the heat dissipation structure 1a can be manufactured by the same manufacturing method as the heat dissipation structure 1 described above, except that the heat dissipation member 20 is replaced with the heat dissipation member 20a.

3. Battery Next, the battery according to this embodiment will be explained.

FIG. 10 shows a longitudinal cross-sectional view of a battery including a heat dissipation structure. Here, the term "longitudinal cross-sectional view" means a view cut vertically from the upper opening surface to the bottom inside the battery case.

In this embodiment, the battery 40 is, for example, a battery for an electric vehicle, and includes a large number of battery cells 50. The battery 40 includes a bottomed casing 41 that is open on one side. The housing 41 is preferably made of aluminum or an aluminum-based alloy. The battery cell 50 is arranged inside the housing 41 . An electrode (not shown) is provided above the battery cell 50 to protrude. The plurality of battery cells 50 are preferably compressed from both sides of the housing 41 using screws or the like so that they come into close contact with each other (not shown). The bottom portion 42 of the housing 41 is provided with one or more water cooling pipes 43 for flowing cooling water, which is an example of a cooling member 45. The battery cell 50 is arranged in the housing 41 with the heat dissipation structure 1 sandwiched between the battery cell 50 and the bottom part 42 .

The battery 40 includes one or more battery cells 50 as a heat source within a casing 41 having a structure in which a cooling member 45 flows. The heat dissipation structure 1 is interposed between the battery cell 50 and the cooling member 45. In the battery 40 having such a structure, the battery cell 50 transfers heat to the casing 41 through the heat dissipation structure 1 and is effectively removed by water cooling. Note that the cooling member 45 may be read as a "cooling medium" or a "coolant." The cooling member 45 is not limited to cooling water, but is also interpreted to include organic solvents such as liquid nitrogen and ethanol. The cooling member 45 is not necessarily a liquid, but may be a gas or a solid under the conditions used for cooling.

When the battery cell 50 is set in the housing 41 (see FIG. 10), the heat dissipation structure 1 is arranged between the battery cell 50 and the bottom portion 42 provided with the water cooling pipe 43 in the thickness direction of the heat dissipation structure 1. compressed into As a result, heat from the battery cell 50 is easily transmitted to the heat conductive sheet 21, the bottom 42, the water cooling pipe 43, and the cooling member 45. Furthermore, since the heat dissipation structure 1 includes the fixing member 10, the worker can attach the heat dissipation structure 1 to the battery 1 by holding the fixing member 10, improving work efficiency. Note that the battery 40 may include the above-mentioned heat dissipation structure 1a instead of the heat dissipation structure 1.

4. Other Embodiments As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these and can be implemented with various modifications.

Figure 10 shows a cross-sectional view of a battery cell placed horizontally on a heat dissipation structure with its side surfaces in contact with each other, a partially enlarged view of the cross-sectional view, and a partial cross-sectional view of the battery cell expanded during charging and discharging. Each is shown below.

In each of the embodiments described above, a situation has been described in which the battery cells 50 are placed vertically and the heat dissipation structures 1 and 1a are brought into contact with the lower ends thereof, but the arrangement of the battery cells 50 is not limited to this. As shown in FIG. 15, the battery cell 50 may be arranged so that the side surface of the battery cell 50 is brought into contact with each heat radiating member 20, 20a of the heat radiating structure 1, 1a. The temperature of battery cell 50 increases during charging and discharging. If the container of the battery cell 50 itself is made of a highly flexible material, there is a possibility that the battery cell 50 may swell, especially at the sides. Even in such a case, as shown in FIG. 15, each heat dissipating member 20, 20a that constitutes the heat dissipating structure 1, 1a can be deformed to match the shape of the outer surface of the battery cell 50, so that heat dissipation is achieved even during charging and discharging. You can maintain a high level of sexuality.

Furthermore, in the heat dissipation structure 1a, the fixing member 10a may include two or more types of fitting portions 15, 15a, and 15b.

Furthermore, the fixing members 10 and 10a may be formed with one or more positioning holes through which positioning pins provided in the housing 41 (bottom 42, etc.) of the battery 40 can be inserted. The positioning hole is a hole through which a positioning pin protruding from the bottom 42 of the battery 40 can be inserted. By inserting the positioning pin into the positioning hole, positioning of the battery 40 and the heat dissipation structures 1 and 1a becomes easy. Note that there are no particular restrictions on the shapes and positions of the positioning holes and positioning pins.

Furthermore, the heat dissipation structures 1 and 1a have one end of the plurality of heat dissipation members 20 and 20a in the longitudinal direction fixed to one side of the fixing member 10 and 10a in a direction orthogonal to the longitudinal direction using a method such as adhesion or fitting. You can leave it there. In this case, the heat dissipation structures 1 and 1a may have the one end of the plurality of heat dissipation members 20 and 20a and the one side of the fixed member 10 and 10a sewn together using the connecting member 30, or may be sewn together using the connecting member 30. It doesn't have to be attached. Further, the heat radiation structures 1 and 1a may be connected by a connecting member 30 at a position other than both end portions in the longitudinal direction, such as a central portion in the longitudinal direction of the plurality of heat radiation members 20 and 20a. In this case, in the heat dissipation structures 1 and 1a, only the plurality of heat dissipation members 20 and 20a may be connected by the connecting member 30 at a position other than both ends in the longitudinal direction, or the plurality of heat dissipation members 20 and 20a and The fixing members 10 and 10a may be connected by the connecting member 30 at a position other than both ends in the longitudinal direction.

Furthermore, in each of the above-described embodiments, in the heat dissipation structures 1 and 1a, the fixing members 10 and 10a have one side along the longitudinal direction of the heat dissipation members 20 and 20a among the two sides forming the approximately L shape. It is arranged so as to overlap the ends of the heat dissipating members 20, 20a in the transverse direction (direction orthogonal to the longitudinal direction). However, the fixing members 10 and 10a may be arranged such that one side along the longitudinal direction is outside the end in the transverse direction. Further, the fixing members 10 and 10a may be arranged such that one side along the longitudinal direction is located inside the end portion in the transverse direction.

In addition, in each of the above-mentioned embodiments, in the heat dissipation structures 1 and 1a, the fixing members 10 and 10a are fixed in the short direction (orthogonal to the longitudinal direction) of the heat dissipation members 20 and 20a among the two sides forming the approximately L-shape. The heat dissipating members 20 and 20a are arranged such that one side along the heat dissipating members 20 and 20a overlaps one end of the plurality of heat dissipating members 20 and 20a in the longitudinal direction. However, the fixing members 10 and 10a may be arranged such that one side along the width direction is located outside one end portion in the length direction. In this case, it is preferable that the connecting member 30 connects one side of the fixing members 10, 10a along the longitudinal direction and both ends of the plurality of heat radiating members 20, 20 in the longitudinal direction by sewing, respectively.

Further, the shape of the fixing members 10, 10a is not particularly limited, and may be, for example, oval, circular, triangular, etc., as long as it can fix at least one longitudinal end of the plurality of heat dissipating members 20, 20a. It's okay.

Furthermore, in each of the above-described embodiments, the fixing members 10, 10a are connected to each other by connecting the heat radiating members 20, 20a such that the surface on the bottom 42 side is in the same position as the surface on the bottom 42 side of the heat radiating members 20, 20a. The member 30 is fixed. However, the fixing members 10, 10a connect the heat dissipating members 20, 20a such that the battery cell 50 side surface of the fixing members 10, 10a is in the same position as the battery cell 50 side surface of the heat dissipating members 20, 20a. The connecting member 30 may be fixed. Furthermore, the fixing members 10 and 10a may be arranged at a middle position in the height direction (direction from the battery cell 50 toward the bottom portion 42) of the heat dissipating members 20 and 20a.

Further, in the heat dissipation member 20, the through passage 23 does not need to be formed in the cushion member 22. In that case, the heat dissipation member 20 has a structure in which a cushion member 22 is filled in a through passage of a spiral heat conductive sheet 21. The through passage does not need to be formed in the cushion member 22 as long as it is formed by the winding structure of at least the heat conductive sheet 21 of the heat conductive sheet 21 and the cushion member 22.

Further, the spiral cushion member 22 in the heat radiating member 20a is not limited to the same width as the heat conductive sheet 21, and may be larger or smaller than the width of the heat conductive sheet 21.

Further, the heat source includes not only the battery cell 50 but also all objects that generate heat, such as a circuit board and an electronic device body. For example, the heat source may be an electronic component such as a capacitor or an IC chip. Similarly, the cooling member 45 may be made of not only water for cooling, but also an organic solvent, liquid nitrogen, or gas for cooling. Furthermore, the heat dissipation structures 1 and 1a may be placed in structures other than the battery 40, such as electronic equipment, household appliances, power generation devices, and the like.

Furthermore, the plurality of components of each of the embodiments described above can be freely combined, except when they cannot be combined with each other. For example, the heat dissipation structure 1a may be included in the battery 40.

DESCRIPTION OF SYMBOLS 1, 1a... Heat dissipation structure, 10, 10a... Fixing member, 15, 15a, 15b... Fitting part, 20, 20a... Heat dissipation member, 21... Heat conductive sheet, 22... ... Cushion member, 23, 23a... Penetration path, 30... Connection member, 40... Battery, 41... Housing, 45... Cooling member, 50... Battery cell (heat source) One case).

Claims (11)

A heat dissipation structure in which a plurality of heat dissipation members are connected to increase heat dissipation from a heat source,
The heat dissipation member is
a heat conductive sheet having a spirally wound shape for transmitting heat from the heat source;
a cushion member provided on the annular back surface of the heat conductive sheet and more easily deformed to match the surface shape of the heat source than the heat conductive sheet;
a through path that penetrates in the direction in which the thermally conductive sheet advances while being wound;
Equipped with
A fixing member capable of fixing the plurality of heat dissipating members in a state where they are arranged in a direction perpendicular to the longitudinal direction thereof,
The fixing member is a substantially L-shaped member composed of one side along the longitudinal direction and one side along the direction perpendicular to the longitudinal direction among four sides surrounding the plurality of heat dissipating members. A heat dissipation structure. 2. The heat dissipating member according to claim 1, further comprising a connecting member that connects at least one end of the plurality of heat dissipating members in the longitudinal direction in a state where the plurality of heat dissipating members are arranged in a direction orthogonal to the longitudinal direction. Heat dissipation structure. 3. The connecting member connects at least one end of the plurality of heat dissipating members in the longitudinal direction by fixing them to one side of the fixing member along a direction perpendicular to the longitudinal direction. heat dissipation structure. The heat dissipation structure according to claim 2 or 3, wherein the connecting member is made of thread. configured to be able to fit with the other adjacent heat dissipation structure,
The heat dissipation structure according to any one of claims 1 to 4, wherein the fixing member includes a fitting part that can be fitted to the fixing member of the other heat dissipation structure. The heat dissipation structure according to any one of claims 1 to 5, wherein the fixing member is formed so that its thickness is thinner than the thickness of the heat dissipation member deformed by pressure from the heat source. body. The cushion member is a cylindrical cushion member having the through passage in the longitudinal direction,
7. The heat dissipation structure according to claim 1, wherein the heat conductive sheet is wound spirally around the outer surface of the cylindrical cushion member. The heat dissipation structure according to any one of claims 1 to 6, wherein the cushion member is a spiral cushion member wound in a spiral shape along the annular back surface of the heat conductive sheet. . 9. The heat conductive sheet according to claim 1, further comprising a heat conductive oil on the surface of the heat conductive sheet for increasing heat conductivity from a heat source in contact with the surface to the surface. Heat dissipation structure. The thermally conductive oil includes silicone oil and a thermally conductive filler that has higher thermal conductivity than the silicone oil and is made of one or more of metals, ceramics, and carbon. Heat dissipation structure. A battery comprising one or more battery cells as a heat source in a housing having a structure for flowing a cooling member, wherein the battery according to any one of claims 1 to 10 is provided between the battery cell and the housing. A battery equipped with the heat dissipation structure described in Section 1.

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