JP2020202272A - Heat dissipation structure and battery having the same - Google Patents

Abstract

To provide a heat dissipation structure that can adapt to various forms of heat sources, is light in weight, can achieve high heat dissipation efficiency by reliable heat conduction, and is excellent in restoration characteristics and damage suppression for pressing from a heat source, and a battery having the same.SOLUTION: The present invention relates to a heat dissipation structure 1 having a plurality of heat dissipation members 5 each of which includes a cushion member 11 having an elongated hollow or solid shape, and heat conduction sheets 10 covering the outer surfaces of the cushion members 11, the heat conductive sheets 10 having surplus regions 10a that can overlap each other in a non-adhesive state beyond the peripheral lengths of the outer surfaces of the cushion members 11, and also relates to a battery 40 having the same.SELECTED DRAWING: Figure 2

Description

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

Control systems for automobiles, aircraft, ships, and 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.

In order to realize quick heat dissipation from the circuit board, conventionally, the circuit board itself is made of a material having excellent heat dissipation, a heat sink is attached, or a cooling fan is driven by a single means or a combination of multiple means. It is done. Of these, a method in which the circuit board itself is made of a material having excellent heat dissipation, for example, diamond, aluminum nitride (AlN), cubic boron nitride (cBN), etc., makes the cost of the circuit board extremely high. In addition, the arrangement of the cooling fan causes problems such as failure of the rotating device called the fan, maintenance necessity for preventing the failure, and difficulty in securing the installation space. On the other hand, 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 widely used as a heat-dissipating component (see Patent Document 1).

By the way, at present, there are active movements around the world to gradually convert conventional gasoline-powered vehicles or diesel-powered vehicles to electric vehicles for the purpose of reducing the burden on the global environment. In particular, electric vehicles are becoming more widespread in China as well as in European countries such as France, the Netherlands, and Germany. In order to popularize electric vehicles, it is necessary to develop high-performance batteries and install a large number of charging stations. In particular, technological development for enhancing the charge / discharge function of lithium-based automobile batteries is important. It is well known that the above-mentioned automobile battery cannot fully exert its charge / discharge function at a high temperature of 60 degrees Celsius or higher. For this reason, it is important to improve the heat dissipation of the battery as well as the circuit board described above.

To realize quick heat dissipation of the battery, place the water cooling pipe in a metal housing with excellent thermal conductivity such as aluminum, place a large number of battery cells in the housing, and place the battery cell and the bottom of the housing. A structure in which an adhesive rubber sheet is sandwiched between and is adopted. In a battery having such a structure, the battery cell transfers heat to the housing through a rubber sheet and is effectively removed by water cooling.

Japanese Patent Application Laid-Open No. 2008-24399

However, in the conventional battery as described above, since 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 the rubber sheet is also conceivable, but since the lower surfaces of the plurality of battery cells are not flat and have steps, a gap is generated between the battery cells and the spacer, and the heat transfer efficiency is improved. descend. As seen in such an example, since the battery cell can take various forms (including unevenness such as a step or a surface state), it is possible to adapt to various forms of the battery cell and realize high heat transfer efficiency. The demand for is increasing. Further, it is desired to reduce the weight of the entire battery, to restore the shape to a shape close to the original shape when the battery cell is removed, and to suppress damage to the heat dissipation structure due to pressing from the battery cell. In addition, it is also necessary to realize reliable heat conduction between a heat source such as a battery cell and a cooling member. The above request is not only for a battery cell but also for other heat sources such as a circuit board, an electronic component, or an electronic device main body.

The present invention has been made in view of the above problems, is adaptable to various forms of a heat source, is lightweight, can realize high heat dissipation efficiency by reliable heat conduction, and is pressed from a heat source. It is an object of the present invention to provide a heat radiating structure having excellent restoration characteristics and damage suppression, and a battery provided with the heat radiating structure.

(1) The heat radiating structure according to the embodiment for achieving the above object is a heat radiating structure including a plurality of heat radiating members, and the heat radiating member is a cushion member having a long hollow or solid shape. And a heat conductive sheet that covers the outer surface of the cushion member, and the heat conductive sheet includes a surplus region that exceeds the peripheral length of the outer surface of the cushion member and can be overlapped in a non-adhesive state.
(2) In the heat dissipation structure according to another embodiment, preferably, the cushion member is provided inside the hollow portion, which is long in the length direction of the cushion member, and the length direction of the cushion member. Along with, a slit that communicates from the outer surface of the cushion member to the hollow portion is provided.
(3) In the heat radiating structure according to another embodiment, preferably, the plurality of the heat radiating members are connected by a thread in a direction orthogonal to the length direction thereof.
(4) In the heat radiating structure according to another embodiment, preferably, the plurality of the heat radiating members are sewn and connected so as to reach the hollow portion.
(5) In the heat radiating structure according to another embodiment, preferably, the plurality of the heat radiating members are fixed to the frame body in a state of bridging the openings of the frame body.
(6) The heat radiating structure according to another embodiment preferably has a heat conductive oil on the surface of the heat conductive sheet for increasing the heat conductivity from the heat source in contact with the surface to the surface. ..
(7) In the heat radiating structure according to another embodiment, preferably, the heat conductive oil has a higher thermal conductivity than the silicone oil and the silicone oil, and is composed of one or more of metal, ceramics or carbon. Includes with sex filler.
(8) The battery according to the embodiment for achieving the above object is a battery having one or more battery cells as heat sources in a housing having a structure for flowing a cooling member, and the battery cells. Any of the above-mentioned heat dissipation structures is provided between the housing and the housing.
(9) In the battery according to another embodiment, preferably, the heat conductive sheet has the heat radiation structure with the battery cell so that the surplus region contacts either the battery cell or the housing. Provided between the housing and the housing.

According to the present invention, a heat dissipation structure that is adaptable to various forms of a heat source, is lightweight, can realize high heat dissipation efficiency by reliable heat conduction, and has excellent restoration characteristics and damage suppression due to pressing from the heat source. And a battery equipped with it can be provided.

FIG. 1 shows a plan view of the heat radiating structure according to the first embodiment. FIG. 2 is a perspective view (2A) of a part of the heat radiating structure of FIG. 1 and an enlarged view of a region A of FIG. 1, showing a change in form (2B) before and after compressing the heat radiating structure. FIG. 3 shows a modified example of the heat radiating structure of FIG. 1 in the same field of view as that of FIG. 2 (2B). FIG. 4 shows a plan view of the heat radiating structure according to the second embodiment of the present invention. FIG. 5 shows a plan view of the heat radiating structure according to the third embodiment of the present invention. FIG. 6 shows a vertical cross-sectional view of the battery according to the first embodiment of the present invention. FIG. 7 shows an enlarged view of the region B of FIG. FIG. 8 shows an enlarged view of a region similar to region B in FIG. 6 in the battery according to the second embodiment.

Next, each embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments described below does not limit the invention according to the claims, and all of the elements and combinations thereof described in each embodiment are the means for solving the present invention. Is not always required.

1. 1. Heat dissipation structure (first embodiment)
FIG. 1 shows a plan view of the heat radiating structure according to the first embodiment. FIG. 2 is a perspective view (2A) of a part of the heat radiating structure of FIG. 1 and an enlarged view of a region A of FIG. 1, showing a change in form (2B) before and after compressing the heat radiating structure.

(1) Schematic configuration of heat dissipation structure The heat dissipation structure 1 according to this embodiment includes a plurality of heat dissipation members 5. The plurality of heat radiating members 5 are preferably connected with a gap. The heat radiating member 5 has a substantially cylindrical shape. However, the heat radiating member 5 may be a tubular member having an elliptical shape or a polygonal shape having a triangle or more in the end face shape in the length direction. The heat radiating member 5 includes a cushion member 11 having a long hollow shape, and a heat conductive sheet 10 that covers the outer surface of the cushion member 11. The cushion member 11 may not have a hollow portion 12 long in the length direction thereof, and may have a solid shape (also referred to as a columnar shape). The heat conductive sheet 10 includes a surplus region 10a that exceeds the peripheral length of the outer surface of the cushion member 11 and can be overlapped in a non-adhesive state. The "surplus area" may be paraphrased as a "overlapping area" or a "tongue piece site".

The heat conductive sheet 10 goes around the outer surface of the cushion member 11 and further overlaps the surplus region 10a to wind the cushion member 11. The surplus region 10a is a region in which the heat conductive sheets 10 are not adhered to each other. Although the heat conductive sheet 10 is fixed to the outer surface of the cushion member 11, both ends of the cushion member 11 are not fixed to each other. The heat conductive sheet 10 is preferably fixed to the cushion member 11 at a portion in contact with the outer surface of the cushion member 11 with an adhesive interposed therebetween. However, the heat conductive sheet 10 may be fixed to the cushion member 11 without the intervention of an adhesive. The cushion member 11 is more easily deformed according to the surface shape of the heat source than the heat conductive sheet 10. In FIG. 1, the heat radiating structure 1 includes 18 heat radiating members 5, but the number of the heat radiating members 5 does not matter as long as it is two or more.

The plurality of heat radiating members 5 are connected at one place or two or more places in the length direction of the heat radiating member 5 by a thread 15 in a direction orthogonal to the length direction of the heat radiating member 5. The thread 15 is an example of a connecting member that regulates the heat radiating members 5 so as not to move freely. The thread 15 includes a number of rings corresponding to the number of heat radiating members 5. The heat radiating member 5 is inserted in the ring. A regulation unit 17 that regulates the spread of the wheels is provided at the connecting portion of the plurality of wheels. The regulating unit 17 may be a knot of the thread 15 or a member made of a resin, metal, ceramics, wood, or the like separate from the thread 15.

Next, each component of the heat dissipation structure 1 will be described.

(2) Heat conduction sheet

The surplus region 10a of the heat conductive sheet 10 enables the heat conductive sheets 10 to come into contact with each other in the circumferential direction of the cushion member 11 even if the heat radiating member 5 is compressed between the heat source and the cooling portion and becomes flat. Has a sufficient length. As a result, the heat transfer route from the heat source to the cooling portion can be reliably formed in both the left and right directions when viewed from the end face in the length direction of the heat radiating member 5.

The heat conductive sheet 10 is preferably a sheet containing carbon, and more preferably 90% by mass or more of carbon. For example, a graphite film formed by firing a resin can be used for the heat conductive sheet 10. However, the heat conductive sheet 10 may be a sheet containing carbon and resin. In that case, the resin may be a synthetic fiber, and in that case, an aramid fiber can be preferably used as the resin. The term "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. In this embodiment, the heat conductive sheet 10 can be a thin sheet obtained by curing a material in which graphite fibers and carbon particles are mixed and dispersed in a resin. The heat conductive sheet 10 may be carbon fiber knitted in a mesh shape, and may be blended or knitted. In addition, various fillers such as graphite fibers, carbon particles and carbon fibers are all included in the concept of carbon fillers.

When the heat conductive sheet 10 is a sheet containing carbon and a resin, the resin may exceed 50% by mass or 50% by mass or less with respect to the total mass of the heat conductive sheet 10. .. That is, it does not matter whether or not the heat conductive sheet 10 uses resin as the main material as long as there is no major problem in heat conduction. As the resin, for example, a thermoplastic resin can be preferably used. As 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 aroma. Group polyamide (aramid fiber) and the like can be preferably mentioned. The resin is dispersed in the gaps between the carbon fillers in the form of particles or fibers in the state before molding of the heat conductive sheet 10. In addition to the carbon filler and the resin, the heat conductive sheet 10 may be dispersed with AlN or diamond as a filler for further enhancing the heat conduction. Further, instead of the resin, an elastomer softer than the resin may be used. The thermal conductivity sheet 10 can also be a sheet containing metals and / or ceramics in place of or with carbon as described above. As the metal, those having relatively high thermal conductivity such as aluminum, copper, and alloys containing at least one of them can be selected. Further, as the ceramics, ceramics having relatively high thermal conductivity such as Al ₂ O ₃ , AlN, cBN, and hBN can be selected.

It does not matter whether the heat conductive sheet 10 is excellent in conductivity or not. The thermal conductivity of the heat conductive sheet 10 is preferably 10 W / mK or more. In this embodiment, the heat conductive sheet 10 is preferably a strip of graphite and is made of a material having excellent heat conductivity and conductivity. The heat conductive sheet 10 is preferably a sheet having excellent curvature (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. However, since the thermal conductivity of the heat conductive sheet 10 decreases as the thickness increases, the thickness of the heat conductive sheet 10 should be determined by comprehensively considering the strength, flexibility and heat conductivity of the sheet. preferable.

(3) Cushion member The important functions of the cushion member 11 are deformability and resilience. The resilience depends on the elastic deformability of the cushion member 11. Deformability is a characteristic required to follow the shape of the heat source, especially in the case of a battery cell that contains semi-solid materials such as lithium-ion batteries and contents that also have liquid properties in a easily deformable package. In many cases, the design dimensions are irregular or the dimensional accuracy cannot be improved. Therefore, it is important to maintain the deformability of the cushion member 11 and the resilience for maintaining the following force.

The cushion member 11 is a tubular member (also referred to as a tubular cushion member) provided in the cylinder of the heat conductive sheet 10. A hollow portion 12 is formed in the length direction of the cushion member 11. In this embodiment, the hollow portion 12 is a gangway that penetrates in the length direction of the cushion member 11. However, at least one of both ends of the hollow portion 12 in the length direction may be closed.

The cushion member 11 has a function of improving the contact between the heat conductive sheet 10 and the heat source even when the heat source in contact with the heat radiating member 5 is not flat. Further, the hollow portion 12 facilitates the deformation of the cushion member 11, and further contributes to the weight reduction of the heat radiating structure 1. The cushion member 11 also has a function as a protective member for preventing the heat conductive sheet 10 from being damaged by a load applied to the heat conductive sheet 10 from a heat source or the like. The cushion member 11 is more easily elastically deformed than the heat conductive sheet 10, and is less likely to crack or crack due to deformation due to pressing from a heat source or the like and its release. Therefore, the cushion member 11 can suppress the situation where the heat conductive sheet 10 is cracked. In this embodiment, the cushion member 11 is a member having a lower thermal conductivity than the heat conductive sheet 10.

The cushion member 11 is preferably 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 and other thermoplastic elastomers, or composites thereof and the like. The cushion member 11 is preferably made of a material having high heat resistance that can maintain its shape without being melted or decomposed by the heat transmitted through the heat conductive sheet 10. In this embodiment, the cushion member 11 is more preferably made of a urethane-based elastomer impregnated with silicone or silicone rubber. The cushion member 11 may be configured by dispersing fillers typified by Al ₂ O ₃ , AlN, cBN, hBN, diamond particles, etc. in rubber in order to increase its thermal conductivity as much as possible. The cushion member 11 may contain air bubbles in the cushion member 11 or may not contain air bubbles. Further, the "cushion member" means 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 be read as a "rubber-like elastic body". Further, as a modification of the cushion member 11, a metal may be used instead of the rubber-like elastic body. The cushion member 11 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.

(4) Connecting Member The thread 15 which is an example of the connecting member is a member which connects a plurality of heat radiating members 5 and regulates the free movement of the heat radiating member 5. The yarn 15 is preferably a yarn that can withstand a high temperature of about 120 ° C., and is preferably composed of a twisted yarn made of fibers such as natural fibers, synthetic fibers, carbon fibers, and metal fibers. It is preferable that the thread 15 has flexibility or a spatial region of a ring that allows the heat radiating member 5 to have a flat shape due to the load of a heat source or the like. The connecting member is not an essential member for the heat dissipation structure 1.

The gap between the heat radiating members 5 becomes narrower when the heat radiating member 5 is crushed by being pressed by a heat source or the like. If the heat radiating member 5 is hardly crushed, the adhesion between the heat conductive sheet 10 and the heat source or the like may be lowered. The thickness of the heat radiating member 5 suitable for reducing such a risk when compressed in the vertical direction, that is, in the direction from the heat source toward the cooling portion is at least the pipe diameter of the heat radiating member 5 (= circle-equivalent diameter: D). It is 80%. Here, the "circle-equivalent diameter" means the diameter of a perfect circle having the same area as the cross-sectional area of the pipe when the heat radiating member 5 is cut perpendicularly to the length direction thereof. When the heat radiating member 5 is a cylinder having a perfect circular cross section, its diameter is the same as the circle-equivalent diameter. When the heat radiating member 5 receives the above compression, it can be considered to be deformed so that the surface in contact with the heat source or the like is a flat surface and the direction of the gap between the heat radiating members 5 is a substantially arc cross section. If the gap is made sufficiently large, the heat radiating member 5 does not come into contact with the adjacent heat radiating member 5. On the contrary, if the gap is too small, even if the heat radiating member 5 is compressed in the vertical direction, it may come into contact with the adjacent heat radiating member 5 and not be further crushed. If the gap is set to 11.4% or more of the circle-equivalent diameter D of the heat-dissipating member 5, the heat-dissipating members 5 come into contact with each other when the heat-dissipating member 5 is compressed to a thickness of 80% of the circle-equivalent diameter D and deformed. Therefore, it is possible to prevent the deformation from becoming an obstacle. In this embodiment, the gap is set to 0.6D.

(5) Thermally Conductive Oil The thermally conductive oil preferably contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon. The heat conductive sheet 10 has a gap (hole or recess) microscopically. Normally, air is present in the gap, which may adversely affect the thermal conductivity. The heat conductive oil fills the gap and exists in place of air, and has a function of improving the heat conductivity of the heat conductive sheet 10.

The heat conductive oil is provided on the surface of the heat conductive sheet 10, at least the surface where the heat source or the like and the heat conductive sheet 10 come into contact with each other. Thermally conductive oil may be provided on both the front and back surfaces of the surplus region 10a. In the present application, the "oil" of the thermally conductive oil refers to a combustible substance that is liquid or semi-solid at room temperature (any temperature in the range of 20 to 25 ° C.) that is water-insoluble. Instead of the word "oil", "grease" or "wax" can also be used. The heat conductive oil is an oil having a property that does not interfere with heat conduction when heat is transferred from the heat source to the heat conductive sheet 10. As the heat conductive oil, a hydrocarbon-based oil or a silicone oil can be used. The thermally conductive oil preferably contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon.

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. Reactive silicone oils include, for example, various silicone oils such as amino-modified type, epoxy-modified type, carboxy-modified type, carbinol-modified type, methacryl-modified type, mercapto-modified type, and 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. Since silicone oil is an oil having excellent heat resistance, cold resistance, viscosity stability, and thermal conductivity, heat is applied to the surface of the thermal conductive sheet 10 and intervened between the heat source and the thermal conductive sheet 10. It is particularly suitable as a conductive oil.

The thermally conductive oil preferably contains, in addition to the oil, a thermally conductive filler composed of one or more of metal, ceramics or carbon. Examples of the metal include gold, silver, copper, aluminum, beryllium, and tungsten. Examples of 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.

The heat conductive oil is preferably interposed between the heat source and the heat conductive sheet 10 as well as between the heat conductive sheet 10 and the cooling portion. The heat conductive oil may be applied to the entire surface of the heat conductive sheet 10 or may be applied to a part of the heat conductive sheet 10. The method for allowing the heat conductive oil to exist in the heat conductive sheet 10 is not particularly limited, and includes spraying with a spray, coating with a brush, and immersing the heat conductive sheet 10 in the heat conductive oil. Any method may be used. The heat conductive oil is not an essential configuration for the heat radiating structure 1, but an additional configuration that can be suitably provided. This also applies to the second and subsequent embodiments.

(Modified example of the first embodiment)
FIG. 3 shows a modified example of the heat dissipation structure of FIG. 1 in the same field of view as in FIG. 2 (2B).

The heat radiating structure 1b according to the modified example includes a plurality of heat radiating members 5. The heat radiating member 5 includes a cushion member 11 inside a cylindrically wound heat radiating sheet 10 having a surplus region 10a. The cushion member 11 is a member similar to the first embodiment, and is a tubular cushion member fixed to a region other than the excess region 10a of the heat conductive sheet 10. The cushion member 11 is provided inside and communicates with the hollow portion 12 which is long in the length direction of the cushion member 11 and from the outer surface of the cushion member 11 to the hollow portion 12 along the length direction of the cushion member 11. The slit 11b is provided. The cushion member 11 differs from the first embodiment in that it has a slit 11b. The slit 11b is an opening that cuts the thickness of the cushion member 11. As described above, in the heat radiating structure 1b, the cushion member 11 has a tubular shape with a part of the outer surface opened. Therefore, the deformability of the cushion member 11 is further enhanced.

(Second Embodiment)
Next, the heat dissipation structure according to the second embodiment will be described. The parts common to the above embodiments are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 4 shows a plan view of the heat radiating structure according to the second embodiment of the present invention.

The heat radiating structure 1c according to the second embodiment has a structure in which a plurality of heat radiating members 5 similar to those of the first embodiment are connected. The difference between the heat radiating structure 1c and the heat radiating structure 1 is the method of connecting the heat radiating members 5. Specifically, the plurality of heat radiating members 5 are sewn and connected so as to reach the hollow portion 12 of the heat radiating member 5. To sew and connect the heat radiating member 5 with the thread 25, it may be sewn by hand or by using a sewing machine.

(Third Embodiment)
Next, the heat dissipation structure according to the third embodiment will be described. The parts common to the above embodiments are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 5 shows a plan view of the heat radiating structure according to the third embodiment of the present invention.

The heat radiating structure 1d according to the third embodiment includes a plurality of heat radiating members 5, a thread 25 for connecting the heat radiating members 5 to each other, and a frame 30 for fixing the plurality of heat radiating members 5 with the thread 25. The frame 30 is preferably a rectangular thin sheet, preferably having a rectangular opening 31 in the center. The frame 30 may be made of a resin such as a thermosetting resin or a thermoplastic resin, metal, ceramics, or wood as long as it can withstand the temperature of the heat source. The plurality of heat radiating members 5 are fixed to the frame body 30 in a state of bridging the openings 31 of the frame body 30. More specifically, the plurality of heat radiating members 5 are fixed by threads 25 in a state where both ends in the length direction are placed on the opposite sides of the frame body 30. When the heat radiating structure 1d is sandwiched between the heat source and the cooling portion, the middle region of the heat radiating member 5 (the region located in the middle of both ends fixed by the thread 25) receives the load of the heat source or the like. As a result, the intermediate region sinks from the fixed side of both ends toward the opening 31, and projects equal to or more than the seat surface on the opposite side of the fixed side. Therefore, the heat radiating member 5 can come into contact with both the heat source and the cooling portion.

2. 2. Battery Next, a preferred embodiment of the battery according to the present invention will be described.

(First Embodiment)
FIG. 6 shows a vertical cross-sectional view of the battery according to the first embodiment of the present invention. Here, the "vertical cross-sectional view" means a view of cutting the battery in the length direction of the battery cell inside the housing of the battery.

The battery 40 according to this embodiment includes a battery cell 50 as one or more heat sources in a housing 41 having a structure for flowing a cooling member 45, and dissipates heat between the battery cell 50 and the housing 41. It includes structures 1, 1b, 1c, and 1d (hereinafter, also referred to as "heat dissipation structure 1 and the like"). In the heat radiating structure 1 and the like, the heat conductive sheet 10 includes a surplus region 10a. The heat radiating structure 1 and the like are housed with the battery cell 50 so that the surplus region 10a of the heat conductive sheet 10 contacts either the battery cell 50 or the housing 41 (specifically, the bottom portion 42 in this embodiment). It is provided between the body 41 and the body 41. Hereinafter, the configuration of the battery 40 will be described in detail.

In this embodiment, the battery 40 is, for example, a battery for an electric vehicle and includes a large number of battery cells (an example of a heat source, which may be simply referred to as a "cell") 50. The battery 40 preferably includes a bottomed housing 41 that opens to one side. The housing 41 is preferably made of aluminum or an aluminum-based alloy. The battery cell 50 is arranged inside 44 of the housing 41. An electrode (not shown) is projected above the battery cell 50. The plurality of battery cells 50 are preferably brought into close contact with each other in the housing 41 by applying a force in the direction of compression from both sides thereof using screws or the like (not shown). The bottom 42 (an example of a cooling portion) of the housing 41 is provided with one or more water cooling pipes 43 for flowing cooling water, which is an example of the cooling member 45. The cooling member may be referred to as a cooling medium or a coolant. The battery cell 50 is arranged in the housing 41 so as to sandwich the heat radiating structure 1 and the like with the bottom portion 42. In the battery 40 having such a structure, the battery cell 50 transfers heat to the housing 41 through the heat radiating structure 1 and the like, and is effectively removed by water cooling. The cooling member 45 is not limited to cooling water, but is interpreted to include an organic solvent such as liquid nitrogen and ethanol. The cooling member 45 is not limited to a liquid under the conditions used for cooling, and may be a gas or a solid.

FIG. 7 shows an enlarged view of the region B of FIG. In FIG. 7, a part of the heat radiating member 5 is shown in an enlarged manner.

The heat radiating structure 1 and the like are provided in the housing 41 in a state of being sandwiched between the battery cell 50 and the bottom portion 42 with the surplus area 10a of the heat radiating member 5 facing the battery cell 50 side. Therefore, the heat from the battery cell 50 is transferred from the surplus region 10a of the heat conductive sheet 10 to the bottom 42 along the circumferences on both sides (see the routes C1 and C2 in the figure). Therefore, the heat transfer route can be reliably increased, and thus the heat dissipation from the battery cell 50 can be further enhanced. In addition, the surplus region 10a is a region in which the heat conductive sheets 10 are not connected to each other. Therefore, when the heat radiating member 5 is deformed flat, it can be deformed following the deformation of the cushion member 11.

(Second Embodiment)
Next, the battery according to the second embodiment will be described. The parts common to the above embodiments are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 8 shows an enlarged view of a region similar to region B in FIG. 6 in the battery according to the second embodiment. In FIG. 8, a part of the heat radiating member 5 is enlarged and shown.

In this embodiment, the heat radiating structure 1 and the like are arranged so that the surplus region 10a faces the bottom 42 side. Even in such an arrangement type, the heat from the battery cell 50 is transmitted to the bottom portion 42 along both sides in the circumferential direction of the heat radiating member 5 (see the routes of C1 and C2 in the figure). Therefore, as in the first embodiment, the heat dissipation from the battery cell 50 can be further improved. Further, the heat conductive sheet 10 can be deformed following the deformation of the cushion member 11 when the heat radiating member 5 is deformed flat. Therefore, the risk of damage to the heat conductive sheet 10 can be reduced.

3. 3. 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 in various modifications.

In each of the above-described battery embodiments, the heat dissipation structure 1 and the like are sandwiched between the lower end of the battery cell 50 and the bottom 42 of the housing 41, but between the side surface of the battery cell 50 and the bottom 42. The heat radiating structure 1 and the like may be sandwiched. Further, in the battery 40 according to the first embodiment and the second embodiment, the surplus area 10a of all the heat radiating members 5 faces the lower end side of the battery cell 50 or the bottom 42 side of the housing 41. However, the surplus area 10a of a part of the heat radiating member 5 may face the lower end side of the battery cell 50, and the surplus area 10a of the remaining heat radiating member 5 may face the bottom 42 side.

Further, the slit 11b is not limited to a linear gap when the heat radiating member 5 is viewed from the battery cell 50 side in a plan view, and may be, for example, a wavy gap or a zigzag gap.

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 main body. For example, the heat source may be an electronic component such as a capacitor and an IC chip. Similarly, the cooling member 45 may be not only cooling water but also an organic solvent, liquid nitrogen, or a cooling gas. Further, the heat radiating structure 1 and the like may be arranged in a structure other than the battery 40, for example, an electronic device, a home appliance, a power generation device and the like.

Further, the plurality of components of each of the above-described embodiments can be freely combined except when they cannot be combined with each other. For example, the slit 11b may be provided in the heat radiating structures 1c and 1d.

The heat dissipation structure according to the present invention can be used not only for automobile batteries, but also for various electronic devices such as automobiles, industrial robots, power generation devices, PCs, and household electric appliances. Further, the battery according to the present invention can be used not only as a battery for automobiles but also as a rechargeable battery for home use and a battery for electronic devices such as PCs.

1,1b, 1c, 1d ... Heat dissipation structure, 5 ... Heat dissipation member, 10 ... Heat conduction sheet, 10a ... Surplus area, 11 ... Cushion member, 11b ... Slit, 12 ... Hollow part, 15, 25 ... Thread (an example of connecting member), 30 ... Frame body, 31 ... Opening, 40 ... Battery, 41 ... Housing, 45 ... -Cooling member, 50 ... Battery cell (an example of heat source).

Claims (9)

A heat dissipation structure including a plurality of heat dissipation members.
The heat radiating member is
Cushion members with a long hollow or solid shape,
A heat conductive sheet that covers the outer surface of the cushion member and
With
The heat conductive sheet is a heat radiating structure having a surplus region that exceeds the peripheral length of the outer surface of the cushion member and can be overlapped in a non-adhesive state. The cushion member is
A hollow portion that is provided inside and is long in the length direction of the cushion member,
A slit that communicates with the hollow portion from the outer surface of the cushion member along the length direction of the cushion member.
The heat radiating structure according to claim 1. The heat radiating structure according to claim 1 or 2, wherein the plurality of heat radiating members are connected by a thread in a direction orthogonal to the length direction thereof. The heat radiating structure according to claim 3, wherein the plurality of heat radiating members are sewn and connected so as to reach the hollow portion of the thread. The heat-dissipating structure according to any one of claims 1 to 4, wherein the plurality of heat-dissipating members are fixed to the frame in a state of bridging the openings of the frame. The heat radiating structure according to any one of claims 1 to 5, wherein the surface of the heat conductive sheet has a heat conductive oil for increasing the heat conductivity from the heat source in contact with the surface to the surface. The heat-dissipating structure according to claim 6, wherein the thermally conductive oil contains a silicone oil and a thermally conductive filler having a higher thermal conductivity than the silicone oil and consisting of one or more of metal, ceramics or carbon. A battery having one or more battery cells as a heat source in a housing having a structure for flowing a cooling member, and any one of claims 1 to 7 is provided between the battery cells and the housing. A battery with the heat dissipation structure described in the section. The battery according to claim 8, wherein the heat conductive sheet is provided with the heat radiating structure between the battery cell and the housing so that the surplus region contacts either the battery cell or the housing. ..