JP2021197295A - Heat dissipation structure, battery and electronic device - Google Patents

Abstract

To provide a heat dissipation structure, a battery, and an electronic device that can adapt to various forms of heat sources, is lightweight, has excellent elastic deformability, and has excellent heat dissipation efficiency.SOLUTION: In a heat dissipation structure 1 according to the present invention in which a plurality of heat dissipation members 20 that enhance heat dissipation from a heat source are connected to each other, the heat dissipation member 20 includes a heat conductive sheet 21 that travels while winding in a spiral to transfer heat from the heat source, a cushion member 22 that is spirally wound along the annular back surface of the heat conductive sheet 21 and is more easily deformed than the heat conductive sheet 21, and a gangway 23 that penetrates in the direction of travel while winding the heat conductive sheet 21, and the plurality of heat dissipation members 20 are knitted and connected to each other, and there are also provided a battery and an electronic device.SELECTED DRAWING: Figure 1

Description

The present invention relates to heat dissipation structures, batteries and electronic devices.

Control systems for automobiles, aircraft, ships or household or commercial electronic devices are becoming more accurate and complex, and the density of small electronic components on circuit boards is increasing. .. As a result, it is strongly desired to solve the failure and shortening of the life of electronic components due to heat generation around the circuit board.

In order to realize quick heat dissipation from the circuit board, the circuit board itself has traditionally been made of a material with excellent heat dissipation, and a single or multiple means such as attaching a heat sink or driving a cooling fan have been used. It is done. Of these, a method in which the circuit board itself is made of a material having excellent heat dissipation, such as diamond, aluminum nitride (AlN), cubic boron nitride (cBN), etc., makes the cost of the circuit board extremely high. Further, the arrangement of the cooling fan causes a problem that a rotating device called a fan fails, maintenance is required to prevent the failure, and it is difficult to secure an installation space. 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 dissipation 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, it is important to develop technology to enhance the charge / discharge function of lithium-based automobile batteries. It is well known that the above-mentioned automobile battery cannot fully exhibit the 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.

In order to quickly dissipate heat from the battery, place a water-cooled 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 a rubber sheet is also conceivable, but since the lower surfaces of a plurality of battery cells are not flat and have steps, a gap is created between the battery cells and the spacer, and the heat transfer efficiency is improved. descend. As can be seen in such an example, since the battery cell can take various forms (including unevenness such as a step or a non-smooth surface state), it can be adapted to various forms of the battery cell and has high heat transfer efficiency. There is a growing demand for realization. Further, it is required that the material of the battery cell container is lighter and elastically deformed, and a heat dissipation structure that is lighter in weight and returns to a shape close to the original shape when the battery cell is removed is desired. There is. This leads not only to battery cells, but also to other heat sources such as circuit boards, electronic components or the body of electronic devices. Responding to such demands will also contribute to the achievement of Applicant's Sustainable Development Goals of "Ensuring access to cheap, reliable and sustainable modern energy for all."

INDUSTRIAL APPLICABILITY The present invention has been made in view of the above problems, and provides a heat dissipation structure, a battery, and an electronic device that can adapt to various forms of a heat source, are lightweight, have excellent elastic deformability, and have excellent heat dissipation efficiency. The purpose is to do.

(1) The heat dissipation structure according to the embodiment for achieving the above object is a heat dissipation structure in which a plurality of heat dissipation members for enhancing heat dissipation from a heat source are connected, and the heat dissipation member is from the heat source. A heat conductive sheet that travels while being wound in a spiral shape to transfer heat, and a cushion that is spirally wound along the annular back surface of the heat conductive sheet and is more easily deformed than the heat conductive sheet. A member and a through-passage penetrating in a direction in which the heat conductive sheet is wound while being wound are provided, and the plurality of heat radiating members are knitted and connected to each other.
(2) In the heat dissipation structure according to another embodiment, preferably, the plurality of heat dissipation members are arranged along a direction orthogonal to the longitudinal direction thereof, and the adjacent heat dissipation members have a double helix structure. May be braided and connected to form a.
(3) In the heat dissipation structure according to another embodiment, preferably, the plurality of heat dissipation members may be knitted with each other to form one sheet-like member.
(4) In the heat dissipation structure according to another embodiment, the thickness of the cushion member may be preferably larger than the thickness of the heat conductive sheet.
(5) The heat radiating structure according to another embodiment preferably has a heat conductive oil on the surface of the heat conductive sheet for enhancing heat conductivity from a heat source in contact with the surface to the surface. May be.
(6) In the heat dissipation structure according to another embodiment, preferably, the heat conductive oil has a higher heat conductivity than the silicone oil and the silicone oil, and is composed of one or more of metal, ceramics or carbon. It may contain a sex filler.
(7) The battery according to the embodiment is a battery having one or more battery cells as heat sources in a housing having a structure for flowing a cooling member, and is between the battery cells and the housing. Is provided with any of the above-mentioned heat dissipation structures.
(8) The electronic device according to an embodiment is an electronic device including a circuit board as a heat source on which electronic components are mounted and a heat sink separately arranged from the circuit board, and is the circuit board. One of the above-mentioned heat dissipation structures is provided between the heat sink and the heat sink.
(9) The electronic device according to an embodiment is an electronic device including an electronic component as a heat source and a heat sink for transferring heat from the electronic component, and is described above between the electronic component and the heat sink. It is provided with any of the heat dissipation structures of.

According to the present invention, it is adaptable to various forms of a heat source, is lightweight, has abundant elastic deformability, has excellent heat dissipation efficiency, enhances uniform heat dissipation in each of a plurality of heat sources, and has a heat source. It is possible to provide a heat dissipation structure capable of easy and reliable positioning, and a battery including the heat dissipation structure.

FIG. 1 shows a plan view of a heat dissipation structure according to an embodiment of the present invention and an enlarged view of a part A thereof. FIG. 2 shows a sectional view taken along line BB of the heat dissipation structure of FIG. 1 and an enlarged view of a part C thereof. FIG. 3 shows a state in which the heat dissipation structure of FIG. 1 is contracted and expanded in the width direction, respectively. FIG. 4 shows a diagram for explaining a part of the method for manufacturing the heat dissipation structure of FIG. FIG. 5 shows a vertical cross-sectional view of the battery including the heat dissipation structure of FIG. FIG. 6 shows a vertical cross-sectional view of the electronic device provided with the heat dissipation structure of FIG. FIG. 7 shows a vertical cross-sectional view of a modified example of the electronic device provided with the heat dissipation structure of FIG. FIG. 8 is a cross-sectional view when the battery cell is horizontally placed on the heat dissipation structure of FIG. 1 so as to bring the side surfaces of the battery cell into contact with each other, a partially enlarged view thereof, and a part when the battery cell expands during charging and discharging. Sectional views are shown respectively.

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

1. 1. Heat dissipation structure FIG. 1 shows a plan view of the heat dissipation structure according to the embodiment of the present invention and an enlarged view of a part A thereof. FIG. 2 shows a sectional view taken along line BB of the heat dissipation structure of FIG. 1 and an enlarged view of a part C thereof. FIG. 3 shows a state in which the heat dissipation structure of FIG. 1 is contracted and expanded in the width direction, respectively. In this embodiment, the heat source is arranged above the paper surface of FIG. Further, in FIG. 1, the heat radiating structure 1 includes 18 heat radiating members 20, but the number of heat radiating members 20 is not particularly limited. The same applies to the subsequent embodiments.

(1) Schematic Configuration The heat dissipation structure 1 according to this embodiment is a member in which a plurality of heat dissipation members 20 for enhancing heat dissipation from a heat source are connected. The heat radiating member 20 is provided with a heat conductive sheet 21 having a shape that advances while being wound in a spiral shape for transferring heat from a heat source, and a heat conductive sheet 21 that is wound in a spiral shape along the annular back surface of the heat conductive sheet 21 to conduct heat. It includes a cushion member 22 that is more easily deformed than the sheet 21, and a through-passage 23 that penetrates the heat conductive sheet 21 in the direction of traveling while winding. The plurality of heat radiating members 20 are knitted and connected to each other. The heat radiating member 20 may be referred to as a "heat conduction member" or a "heat transfer member".

(2) Heat Conductive Sheet The heat conductive sheet 21 is not limited to its constituent material, but is preferably a sheet containing carbon, and more preferably 90% by mass or more of carbon. For example, a graphite film made by firing a resin can be used for the heat conductive sheet 21. However, the heat conductive sheet 21 may be a sheet containing carbon and a resin. In that case, the resin may be synthetic fiber, and in that case, 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 21 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 21 may be carbon fiber knitted in a mesh shape, and may be blended or knitted. In addition, various fillers such as graphite fiber, carbon particles or carbon fiber are all included in the concept of carbon filler.

When the heat conductive sheet 21 is a sheet provided with 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 21. .. That is, it does not matter whether or not the heat conductive sheet 21 uses resin as the main material as long as there is no great 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 fragrance. Group polyamide (aramid fiber) and the like can be preferably mentioned. The resin is dispersed in the gaps between the carbon fillers, for example, in the form of particles or fibers in the state before molding of the heat conductive sheet 21. In addition to the carbon filler and the resin, the heat conductive sheet 21 may be dispersed with AlN or diamond as a filler for further enhancing the heat conduction. Further, instead of the resin, an elastomer that is more flexible than the resin may be used. The heat conductive sheet 21 can also be a sheet containing metals and / or ceramics in place of or with carbon as described above. As the metal, a metal having a relatively high thermal conductivity such as aluminum, copper, and an alloy 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 21 is excellent in conductivity or not. The thermal conductivity of the heat conductive sheet 21 is preferably 10 W / mK or more. In this embodiment, the heat conductive sheet 21 is preferably a film made of graphite, and is made of a material having excellent heat conductivity and conductivity. The heat conductive sheet 21 is preferably a sheet having excellent bendability (or flexibility), and the thickness thereof is not limited, but 0.02 to 3 mm is preferable, and 0.03 to 0.5 mm is more preferable. However, the thermal conductivity of the heat conductive sheet 21 decreases in the thickness direction as the thickness increases, but the heat transmission amount increases as the thickness increases, so that the strength, flexibility and heat conductivity of the sheet are improved. It is preferable to determine the thickness in a comprehensive manner.

(3) Cushion member The important functions of the cushion member 22 are deformability and resilience. Resilience depends on elastic deformability. Deformability is a characteristic necessary to follow the shape of the heat source, and in particular, 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 the case of, there are many cases where the design dimensions are irregular or the dimensional accuracy cannot be improved. Therefore, it is important to maintain the deformability of the cushion member 22 and the resilience for maintaining the following force.

In this embodiment, the cushion member 22 is arranged inside the heat conductive sheet 21 (annular back surface). The heat conductive sheet 21 and the cushion member 22 have a form of integrally traveling in one direction in a spiral shape. Since the heat radiating member 20 has a spiral shape as a whole, it can easily expand and contract in the longitudinal direction of the heat radiating member 20. The cushion member 22 improves the contact between the heat conductive sheet 21 and the heat source even when the heat source in contact with the heat conductive sheet 21 is not flat. Further, the gangway 23 has a function of facilitating the deformation of the cushion member 22, contributing to the weight reduction of the heat radiating structure 1, and enhancing the contact between the heat conductive sheet 21 and the heat source. The cushion member 22 also has a function as a protective member for preventing the heat conductive sheet 21 from being damaged by a load applied to the heat conductive sheet 21. In this embodiment, the cushion member 22 is a member having a lower thermal conductivity than the heat conductive sheet 21. In this embodiment, the through-passage 23 is formed in a circular cross-sectional shape, but the cross-sectional shape of the through-passage 23 is not limited to a circle, for example, a polygon, an ellipse, a semicircle, and a rounded apex. It may be a substantially polygonal shape.

The cushion member 22 is preferably a thermoplastic elastomer such as silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR) or styrene butadiene rubber (SBR); urethane-based , Ester-based, styrene-based, olefin-based, butadiene-based, fluorine-based and other thermoplastic elastomers, or composites thereof. The cushion member 22 is preferably made of a material having high heat resistance to the extent that its shape can be maintained without being melted or decomposed by the heat transmitted through the heat conductive sheet 21. In this embodiment, the cushion member 22 is more preferably made of a urethane-based elastomer impregnated with silicone or a silicone rubber. The cushion member 22 may be configured by dispersing a filler typified by AlN, cBN, hBN, diamond particles, or the like in rubber in order to enhance its thermal conductivity as much as possible. The cushion member 22 may contain air bubbles 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 22, a metal may be used instead of the rubber-like elastic body. For example, the cushion member 22 can be made of spring steel. Further, it is also possible to arrange a coil spring as the cushion member 22. Further, the spirally wound metal may be made of spring steel and arranged on the annular back surface of the heat conductive sheet 21 as a cushion member. Further, the cushion member 22 can be made of a sponge or a solid (a structure that is not porous like a sponge) formed of resin, rubber, or the like.

The thickness L2 of the cushion member 22 is not limited, but it is preferably larger than the thickness L1 of the heat conductive sheet 21, for example, 0.1 to 5 mm is preferable, and 0.5 to 1 mm is more preferable (FIG. 2). See the enlarged view of part C of.). However, it is preferable to determine the thickness of the cushion member 22 by comprehensively considering its strength, flexibility, the thickness of the heat conductive sheet 21, and the like.

The plurality of heat radiating members 20 are preferably arranged along a direction orthogonal to the longitudinal direction (left-right direction in FIG. 1), and the adjacent heat radiating members 20 are knitted so as to form a double helix structure. (See the enlarged view of part A in FIG. 1). Further, the heat dissipation structure 1 is preferably a single sheet-like member formed by knitting a plurality of heat dissipation members 20 with each other (see FIG. 1). In the heat radiating structure 1 configured in this way, even when the lower ends of the plurality of heat sources are not flat, the contact between the heat conductive sheet 21 and the lower ends is good. Further, since the heat radiating structure 1 is knitted so that adjacent heat radiating members 20 form a double helix structure, the distance between the heat radiating members 20 varies even when the heat radiating members 20 are crushed by being pressed by a heat source. Becomes smaller. Therefore, the heat dissipation structure 1 can enhance the uniformity of heat dissipation in each of a large number of heat sources.

Further, the heat radiating structure 1 is knitted so that adjacent heat radiating members 20 form a double helix structure. Therefore, the heat radiating structure 1 not only easily expands and contracts in the longitudinal direction of the heat radiating member 20, but also easily expands and contracts in the direction orthogonal to the longitudinal direction of the heat radiating member 20 as shown in FIG. 3 (FIG. 3). See stretching in the direction of the white arrow inside.). As a result, the heat dissipation structure 1 can be expanded and contracted according to the size and shape of the heat source, the mounting position of the heat dissipation structure 1 in the member requiring heat dissipation such as a battery, and the like. For example, when the heat dissipation structure 1 is larger than the size of the mounting position, the heat dissipation structure 1 can be contracted in a direction orthogonal to the longitudinal direction and accommodated in the mounting position. Further, for example, when the heat radiating structure 1 is smaller than the size of the lower end portion of the heat source, the heat radiating structure 1 can be extended in a direction orthogonal to the longitudinal direction and can surely contact the lower end portion of the heat source. Further, since the heat radiating structure 1 is knitted so that the heat radiating members 20 having a spiral shape as a whole form a double helix structure, contact surfaces S with heat sources and the like are scattered (FIG. 1). See the enlarged view of part A of.). Therefore, the heat radiating structure 1 has high independence with respect to the cushioning property (deformability and resilience) of each of the plurality of contact surfaces S, and the contact with the heat source or the like becomes better.

(6) 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 21 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 21.

The heat conductive oil is provided on the surface of the heat conductive sheet 21, at least the surface where the heat source and the heat conductive sheet 21 come into contact with each other. In the present application, the "oil" of the heat conductive oil refers to a combustible substance that is liquid or semi-solid at room temperature (arbitrary 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 hinder heat conduction when heat is transferred from a heat source to the heat conduction sheet 21. 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. The reactive silicone oil includes, for example, various silicone oils such as an amino-modified type, an epoxy-modified type, a carboxy-modified type, a carbinol-modified type, a methacryl-modified type, a mercapto-modified type, and a phenol-modified type. The non-reactive silicone oil includes various silicone oils such as a polyether-modified type, a methylstyryl-modified type, an alkyl-modified type, a higher fatty acid ester-modified type, a hydrophilic special-modified type, a higher fatty acid-containing type, and a fluorine-modified type. Since silicone oil is an oil having excellent heat resistance, cold resistance, viscosity stability, and heat conductivity, it is applied to the surface of the heat conduction sheet 21 and is interposed between the heat source and the heat conduction sheet 21. It is particularly suitable as a sex 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 the ceramics include alumina, aluminum nitride, cubic boron nitride, and hexagonal boron nitride. Examples of carbon include diamond, graphite, diamond-like carbon, amorphous carbon, and carbon nanotubes.

It is preferable that the heat conductive oil is interposed between the heat source and the heat conductive sheet 21 and also between the heat conductive sheet 21 and the housing of the battery described later. The heat conductive oil may be applied to the entire surface of the heat conductive sheet 21 or may be applied to a part of the heat conductive sheet 21. The method for allowing the heat conductive oil to exist in the heat conductive sheet 21 is not particularly limited, and any method such as spraying with a spray, coating with a brush, or immersing the heat conductive sheet 21 in the heat conductive oil. It may be due to. The heat conductive oil is not an essential configuration for the heat dissipation structure 1 or the battery described later, but is an additional configuration that can be suitably provided.

2. 2. Method for manufacturing a heat radiating structure Next, an example of a suitable manufacturing method for the heat radiating structure 1 according to the present invention will be described. First, an example of a suitable manufacturing method of the heat radiating member 20 constituting the heat radiating structure 1 will be described.

FIG. 4 shows a diagram for explaining a part of the method for manufacturing the heat dissipation structure of FIG.

First, the strip-shaped laminated sheet 28 is manufactured. In the production of 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 wound in a spiral shape and advanced in one direction to manufacture a long heat-dissipating member 20. As a manufacturing method in which an adhesive is not interposed between the heat conductive sheet 21 and the cushion member 22, the following method can be exemplified. For example, the heat conductive sheet 21 is attached on the cushion member 22 in an uncured state in which the cushion member 22 is not completely cured. Then, the cushion member 22 is completely cured by heating.

After winding the strip-shaped laminated sheet 28 in a spiral shape, both ends of the laminated sheet 28 may be cut to adjust the shape. Finally, the heat conductive oil is applied to the surface of the heat conductive sheet 21. The heat radiating member 20 includes a gangway 23 that penetrates in the longitudinal direction thereof. The gangway 23 also penetrates in the direction of the outer surface of the heat radiating member 20. As described above, 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 of integrally traveling in one direction in a spiral shape. Since the heat radiating member 20 has a spiral shape as a whole, it can easily expand and contract in the longitudinal direction of the heat radiating member 20.

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

In the heat radiating structure 1, a plurality of heat radiating members 20 manufactured by the above-mentioned manufacturing method are arranged in a direction orthogonal to the longitudinal direction of the heat radiating member 20, and adjacent heat radiating members 20 form a double helix structure. Manufactured by knitting to do.

3. 3. Battery Next, the battery according to the present invention will be described.

FIG. 5 shows a vertical cross-sectional view of the battery including the heat dissipation structure of FIG. Here, the "vertical cross-sectional view" means a view that vertically cuts from the upper opening surface inside the housing of the battery to the bottom.

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 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 provided so as to project 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 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 battery cell 50 is arranged in the housing 41 so as to sandwich the heat radiating structure 1 with the bottom portion 42.

The battery 40 includes a battery cell 50 as one or more heat sources in a housing 41 having a structure for flowing a cooling member 45. The heat radiating 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 housing 41 through the heat radiating structure 1 and is effectively removed by water cooling. The cooling member 45 may be read as "cooling medium" or "cooling agent". The cooling member 45 is not limited to the 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.

When the battery cell 50 is set in the housing 41 (see FIG. 5), the heat radiation structure 1 has a thickness of the heat radiation structure 1 between the battery cell 50 and the bottom portion 42 provided with the water cooling pipe 43. Compressed in the direction. As a result, the heat from the battery cell 50 is easily transferred to the heat conductive sheet 21, the bottom 42, the water cooling pipe 43, and the cooling member 45.

4. Electronic device Next, the electronic device according to the present invention will be described.

FIG. 6 shows a vertical cross-sectional view of the electronic device provided with the heat dissipation structure of FIG. Here, the "vertical cross-sectional view" means a view that vertically cuts from above the inside of the housing of the electronic device toward the heat sink side.

In this embodiment, the electronic device 60 is, for example, a part of a control device loaded on an automobile. However, the electronic device 60 is not limited to such a control device, and may include various devices such as a PC, a power generation control device, and an industrial robot control device. The electronic device 60 preferably includes a housing 61 that is a substantially elliptical cylinder and is separable in the thickness direction. The electronic device 60 includes a printed circuit board (hereinafter, simply referred to as “circuit board”) 70 in the housing 61, and also includes a heat sink 63 at a predetermined distance from the circuit board 70. In this embodiment, the heat sink 63 is made of a material having high thermal conductivity represented by aluminum or an aluminum-based alloy, and includes a large number of fins for enhancing heat dissipation. The heat sink 63 may be provided with a pin instead of the fin or together with the fin. Further, the shape of the housing 61 is not particularly limited, and may be, for example, a substantially rectangular parallelepiped.

The circuit board 70 is made of a material having excellent insulating properties, and as an example, a paper phenol board in which a paper base material is hardened with a phenol resin, a paper epoxy board in which a paper base material is hardened with an epoxy resin, and a glass fiber are woven. In addition to a glass epoxy substrate made by hardening a cloth with epoxy resin, a glass composite substrate made by mixing paper and a glass base material and hardening it, a ceramic substrate made of highly insulating ceramics such as alumina, polytetrafluoroethylene, and polyimide. It is made of a highly insulating resin such as. It is equipped with many electronic components that are electrically connected or disconnected from the wiring drawn on the front surface (upper surface in FIG. 6) of the circuit board 70. The electronic component is not limited to a specific component, and in this embodiment, the electronic component includes a capacitor 72 and an IC chip 74. In this embodiment, the capacitor 72 and the IC chip 74 are connected to the front surface of the circuit board 70 (see FIG. 6). However, these electronic components 72 and 74 may be connected only to the back surface (lower surface in FIG. 6) of the circuit board 70, or to the front surface and the back surface.

The back surface of the circuit board 70 and the front surface of the heat sink 63 (the surface facing the circuit board 70) are arranged with a predetermined gap between them. The heat dissipation structure 1 is interposed between the circuit board 70 and the heat sink 63. In the electronic device 60 having such a structure, the circuit board 70 transfers heat to the heat sink 63 through the heat dissipation structure 1 to effectively remove heat.

(Modification example of electronic device)
FIG. 7 shows a vertical cross-sectional view of a modified example of the electronic device provided with the heat dissipation structure of FIG. Here, the "vertical cross-sectional view" means a view that cuts vertically from the heat sink to the circuit board.

The electronic device 60a according to the modified example includes one or two or more electronic components as heat sources on the circuit board 70, and also includes a heat sink 63 at a predetermined distance from the electronic components. The electronic component is not limited to a specific component, and may be, for example, an LSI (which may include a CPU or DRAM), a CPU, a DRAM, a ROM, an EEPROM, a capacitor, a coil, or the like. In this embodiment, the electronic component is LSI76. In this embodiment, the electronic device 60a is provided with a plurality of LSIs 76 having the same height on the circuit board 70, but is not limited to this, and may be provided with a plurality of LSIs 76 having different heights on the circuit board 70. .. Further, the electronic device 60a may include a plurality of types of electronic components. The heat dissipation structure 1 is interposed between the LSI 76 and the heat sink 63. Even in the electronic device 60a having such a structure, the LSI 76 transfers heat to the heat sink 63 through the heat radiating structure 1 to effectively remove the heat. Since the configuration of the electronic device 60a other than the arrangement of the circuit board 70 and the heat sink 63 is the same as that of the electronic device 60 described above, detailed description thereof will be omitted.

5. Other Embodiments As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited thereto, and can be variously modified and implemented.

FIG. 8 is a cross-sectional view when the battery cell is horizontally placed on the heat dissipation structure of FIG. 1 so as to bring the side surfaces of the battery cell into contact with each other, a partially enlarged view thereof, and a part when the battery cell expands during charging and discharging. Sectional views are shown respectively.

In the battery 40 described above, the situation in which the battery cell 50 is vertically oriented and the heat radiating structure 1 is brought into contact with the lower end thereof has been described, but the arrangement form of the battery cell 50 is not limited to this. As shown in FIG. 8, the battery cell 50 may be arranged so that the side surface of the battery cell 50 is in contact with each heat radiating member 20 of the heat radiating structure 1. The temperature of the battery cell 50 rises during charging and discharging. If the container of the battery cell 50 itself is made of a flexible material, the side surface of the battery cell 50 may bulge in particular. Even in such a case, as shown in FIG. 8, since each heat radiating member 20 constituting the heat radiating structure 1 can be deformed according to the shape of the outer surface of the battery cell 50, the heat radiating property is maintained high even during charging and discharging. can. Similarly, in the above-mentioned electronic devices 60 and 60a, the heat source and the heat radiating structure 1 are arranged so that the side surfaces of the heat source such as the circuit board 70 and the LSI 76 are in contact with each heat radiating member 20 of the heat radiating structure 1. May be adjusted.

Further, in each of the above-described embodiments, the battery 40 and the electronic devices 60, 60a include one heat radiating structure 1, but the battery 40 and the electronic devices 60, 60a include a plurality of heat radiating structures 1 depending on the shape and size of the heat source. You may have.

Further, as long as the plurality of heat radiating members 20 are knitted and connected to each other, the knitting method is not particularly limited, and for example, the adjacent heat radiating members 20 may not form a double helix structure.

Further, the spiral cushion member 22 in the heat radiating member 20 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, the circuit board 70 and the LSI76, but also all the objects that generate heat such as the electronic devices 60 and 60a. For example, the heat source may be a capacitor 72, an IC chip 74, or the like. 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 dissipation structure 1 may be arranged in a structure other than the battery 40 and the electronic devices 60 and 60a, for example, a home appliance, a power generation device and the like.

1 ... heat dissipation structure, 20 ... heat dissipation member, 21 ... heat conduction sheet, 22 ... cushion member, 23 ... through passage, 40 ... battery, 41 ... housing, 45 ... Cooling member, 50 ... Battery cell (example of heat source), 60, 60a ... Electronic device, 63 ... Heat sink, 70 ... Circuit board (example of heat source), 72 ... Capacitor (an example of an electronic component), 74 ... IC chip (an example of an electronic component), 76 ... LSI (an example of an electronic component, an example of a heat source).

Claims (9)

It is a heat dissipation structure in which a plurality of heat dissipation members that enhance heat dissipation from a heat source are connected.
The heat dissipation member is
A heat conductive sheet having a shape that advances while winding in a spiral shape for transferring heat from the heat source, and
A cushion member that is spirally wound along the annular back surface of the heat conductive sheet and is more easily deformed than the heat conductive sheet.
A gangway that penetrates in the direction of travel while winding the heat conductive sheet,
Equipped with
A heat radiating structure characterized in that the plurality of heat radiating members are knitted and connected to each other. The present invention is characterized in that the plurality of heat radiating members are arranged side by side in a direction orthogonal to the longitudinal direction thereof, and the adjacent heat radiating members are knitted and connected so as to form a double helix structure. The heat dissipation structure according to 1. The heat radiating structure according to claim 1 or 2, wherein the plurality of heat radiating members are knitted together to form one sheet-shaped member. The heat dissipation structure according to any one of claims 1 to 3, wherein the thickness of the cushion member is larger than the thickness of the heat conductive sheet. The invention according to any one of claims 1 to 4, 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. Heat dissipation structure. The fifth aspect of claim 5, wherein the thermally conductive oil contains a silicone oil and a thermally conductive filler which has higher thermal conductivity than the silicone oil and is composed of one or more of metal, ceramics, or carbon. Heat dissipation structure. 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 6 is provided between the battery cells and the housing. A battery with the heat dissipation structure described in section. A circuit board as a heat source for mounting electronic components,
A heat sink separated from the circuit board and
It is an electronic device equipped with
An electronic device comprising the heat dissipation structure according to any one of claims 1 to 6 between the circuit board and the heat sink. Electronic components as a heat source and
A heat sink that transfers heat from the electronic components,
It is an electronic device equipped with
An electronic device comprising the heat dissipation structure according to any one of claims 1 to 6 between the electronic component and the heat sink.

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