JP2021141015A - Heat dissipation structure and battery having the same - Google Patents

Abstract

To provide a heat dissipation structure and a battery that can be coped with a form of a heat source, has light weight, excellent elastic deformability and excellent heat dissipation efficiency, increases uniformity of a heat dissipation property of each heat source, and can easily and reliably position the heat source.SOLUTION: A heat dissipation structure body 1 coupled with a plurality of heat dissipation members 20 is provided. The heat dissipation structure body 20 comprises: a heat conductive sheet 21 of a shape travelling while being spirally wound; a cushion member 22 that is provided on an annular rear face of the heat conductive sheet 21 and is deformed more easily than the conductive sheet 21; and a through path 23 penetrating in a direction in which the heat conductive sheet 21 travels while being wound. The heat dissipation structure body 1 comprises a fixing member 10 that can fix the plurality of heat dissipation members 20 while they are aligned in a direction orthogonal to a longitudinal direction. The fixing member 10 is a member having an approximate U-shape in which one of four sides surrounding the plurality of heat dissipation members 20 is opened, while the plurality of heat dissipation members 20 are aligned. A battery is also provided.SELECTED DRAWING: Figure 1

Description

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

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, 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, 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 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.

In order to quickly dissipate heat from 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 the two 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 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, in order to realize high heat transfer efficiency, it is desirable to dissipate heat uniformly from each of a large number of battery cells so that the temperatures of the large number of battery cells become uniform. Furthermore, there is a demand for a lighter weight and elastically deformable material of the battery cell container, and a heat dissipation structure that reduces the weight of the battery cell and returns to a shape close to the original shape when the battery cell is removed is desired. ing.

In view of the above issues, prior to the present application, the applicant has developed a heat-dissipating structure having the following configuration, and applied for a patent (Japanese Patent Application No. 2018-218802) and an international application based on the patent application (Japanese Patent Application No. 2018-218802). PCT / JP2019 / 042192) was performed.
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 radiating member is
A heat conductive sheet having a shape that advances while spirally winding to transfer heat from the heat source,
A cushion member provided on the annular back surface of the heat conductive sheet and easily deformed according to the surface shape of the heat source as compared with the heat conductive sheet.
A gangway that penetrates in the direction of travel while winding the heat conductive sheet,
With
A heat radiating structure in which the plurality of heat radiating members are connected by a connecting member in a state of being arranged in a direction orthogonal to the direction in which the heat conductive sheet travels while being wound.
The heat radiating structure is a member having excellent heat radiating properties and flexibility, and further, it is required to easily and surely position the heat radiating structure and the heat source. This leads not only to battery cells, but also to other heat sources such as circuit boards, electronic components or electronics bodies.

The present invention has been made in view of the above problems, is adaptable to various forms of heat sources, is lightweight, has abundant elastic deformability, is excellent in heat dissipation efficiency, and has uniform heat dissipation in each of a plurality of heat sources. It is an object of the present invention to provide a heat radiating structure capable of enhancing the heat generation and easily and surely positioning the heat source, 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 in which a plurality of heat radiating members for enhancing heat radiating from a heat source are connected, and the heat radiating member is from the heat source. A heat conductive sheet that travels while winding in a spiral shape to transfer heat, and a cushion that is provided on the annular back surface of the heat conductive sheet and is more easily deformed according to the surface shape of the heat source than the heat conductive sheet. A fixing member provided with a member and a through-passage penetrating in the direction of traveling while winding the heat conductive sheet, and the plurality of heat radiating members can be fixed in a state of being arranged along a direction orthogonal to the longitudinal direction thereof. The fixing member has a substantially U-shape in which one of the four sides surrounding the plurality of heat radiating members is opened in a state where the plurality of heat radiating members are arranged along a direction orthogonal to the longitudinal direction. It is a member.
(2) The heat radiating structure according to another embodiment preferably includes a connecting member that connects the plurality of heat radiating members in a state of being arranged in a direction orthogonal to the longitudinal direction, and the connecting member includes the plurality of connecting members. At least one end of the heat radiating member in the longitudinal direction may be fixed and connected to the fixing member.
(3) In the heat radiating structure according to another embodiment, preferably, the fixing member has a substantially U-shape in which one side along the longitudinal direction is opened among the four sides surrounding the plurality of heat radiating members. The connecting member is a member, and the connecting member fixes and connects both ends of the plurality of heat radiating members in the longitudinal direction to the fixing member, and the connecting member connects at least both ends of the plurality of heat radiating members in the longitudinal direction. It may be connected.
(4) In the heat radiating structure according to another embodiment, preferably, the connecting member may be made of a thread.
(5) The heat radiating structure according to another embodiment is preferably configured so as to be matable with the other adjacent heat radiating structure, and the fixing member is the fixing member of the other heat radiating structure. It may be provided with a fitting portion capable of fitting with.
(6) In the heat radiating structure according to another embodiment, preferably, the fixing member may be formed so that its thickness is thinner than the thickness of the heat radiating member deformed by pressing from the heat source.
(7) In the heat dissipation structure according to another embodiment, preferably, the cushion member is a tubular cushion member having the through-passage in the longitudinal direction, and the heat conductive sheet is the tubular cushion member. The outer surface of the surface may be wound in a spiral shape.
(8) In the heat dissipation structure according to another embodiment, preferably, the cushion member may be a spiral cushion member that is spirally wound along the annular back surface of the heat conductive sheet.
(9) In the heat radiating structure according to another embodiment, preferably, 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. You may.
(10) In the heat radiating structure according to another embodiment, preferably, the heat conductive oil has 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.
(11) 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.

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 radiating structure capable of easy and reliable positioning, and a battery including the heat radiating structure.

FIG. 1 shows a plan view of the heat radiating structure according to the first embodiment. FIG. 2 shows a cross-sectional view taken along the line AA in FIG. 1 and an enlarged view of a part D thereof. FIG. 3 shows a side view of the heat radiating structure shown in FIG. 1 as viewed from the direction of arrow B, and an enlarged view of a part E thereof. FIG. 4 shows a side view of the heat radiating structure shown in FIG. 1 as viewed from the direction of arrow C, and an enlarged view of a part F thereof. FIG. 5 shows a plan view of the heat radiating structure according to the second embodiment. FIG. 6 shows a plan view of the aggregate of the heat radiating structure according to the second embodiment and an enlarged view of a part G thereof. FIG. 7 shows a part of the modified example 1 of the heat radiating structure according to the second embodiment in the same view as the enlarged view of FIG. FIG. 8 shows a part of the modified example 2 of the heat radiating structure according to the second embodiment in the same view as the enlarged view of FIG. FIG. 9 shows a plan view of the heat radiating structure according to the third embodiment. FIG. 10 shows a plan view of the heat radiating structure according to the fourth embodiment. FIG. 11 shows a plan view of an aggregate of heat dissipation structures according to the fourth embodiment. FIG. 12 shows a diagram for explaining a manufacturing process of a heat radiating member constituting the heat radiating structure. FIG. 13 shows a diagram for explaining a preferable manufacturing process of a modified example of the heat radiating member constituting the heat radiating structure. FIG. 14 shows a vertical cross-sectional view of a battery including a heat dissipation structure. FIG. 15 shows a cross-sectional view when the battery cell is laid horizontally so as to be in contact with the side surface of the battery cell on the heat radiating structure, a partially enlarged view thereof, and a partial cross-sectional view when the battery cell expands during charging and discharging. Each is shown.

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 shows a cross-sectional view taken along the line AA in FIG. 1 and an enlarged view of a part D thereof. FIG. 3 shows a side view of the heat radiating structure shown in FIG. 1 as viewed from the direction of arrow B, and an enlarged view of a part E thereof. FIG. 4 shows a side view of the heat radiating structure shown in FIG. 1 as viewed from the direction of arrow C, and an enlarged view of a part F thereof. In this embodiment, the longitudinal direction of the heat radiating 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 surface of FIG. 2, and the cooling member is arranged below the paper surface of FIG. The same applies to the subsequent embodiments.

(1) Schematic Configuration The heat radiating structure 1 according to the first embodiment is a member in which a plurality of heat radiating members 20 for enhancing heat radiating from a heat source are connected. The heat radiating member 20 is provided on the annular back surface of the heat conductive sheet 21 and the heat conductive sheet 21 having a shape of spirally winding to transfer heat from the heat source, and is provided on the surface of the heat source as compared with the heat conductive sheet 21. A cushion member 22 that is easily deformed according to the shape and a through-passage 23 that penetrates in the direction of traveling while winding the heat conductive sheet 21 are provided. Further, the heat radiating structure 1 includes a fixing member 10 which can be fixed in a state where a plurality of heat radiating members 20 are arranged in a direction orthogonal to the longitudinal direction (X direction shown in FIG. 1). The fixing member 10 is a substantially U-shaped member in which one of the four sides surrounding the plurality of heat radiating members 20 is opened in a state where the plurality of heat radiating members 20 are arranged along the direction orthogonal to the longitudinal direction. .. 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 in 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 formed 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 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 21 can be a thin sheet obtained by curing a material obtained by blending and dispersing graphite fibers and carbon particles in a resin. The heat conductive sheet 21 may be carbon fiber knitted in a mesh shape, and may be blended or knitted. 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 21 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 21. .. That is, the heat conductive sheet 21 may or may not use 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, 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, 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 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 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, 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 thermal 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 easiness of deformation 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 in which semi-solid materials such as lithium-ion batteries and contents having liquid properties are contained 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.

The cushion member 22 is a tubular cushion member including a gangway 23 in this embodiment. 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 gangway 23 is formed in a circular cross-sectional shape, but the cross-sectional shape of the gangway 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 or the like. Further, the gangway 23 may be composed of a plurality of gangways, for example, two gangways having a semicircular cross section whose cross-sectional circular shape is divided into two vertically or horizontally.

The cushion member 22 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. The cushion member 22 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 21. In this embodiment, the cushion member 22 is more preferably made of a urethane-based elastomer impregnated with silicone or 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 increase 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 also be made of spring steel. Further, a coil spring can be arranged 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 non-porous structure such as a sponge) formed of resin, rubber or the like.

(4) Connecting Member The connecting member 30 is preferably a member that connects a plurality of heat radiating members 20 in a state of being arranged in a direction orthogonal to the longitudinal direction. The connecting member 30 is preferably a member that connects at least one end of the plurality of heat radiating members 20 in the longitudinal direction, 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 such as a thread or rubber whose portion located between at least a plurality of heat radiating members 20 is made of a deformable material. The connecting member 30 is preferably made of a thread, and more preferably a thread that can withstand a temperature rise due to heat dissipation from a heat source. More specifically, the connecting member 30 is a yarn that can withstand a high temperature of about 120 ° C., and is preferably composed of twisted yarn 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 radiating members 20 to a fixing member 10 described later by sewing using a sewing machine or the like. The sewing method of the connecting member 30 is not particularly limited, and any sewing method such as hand sewing, lock stitching, zigzag stitching, single chain stitching, double chain stitching, overlock stitching, flat stitching, safety stitching, and overlock stitching may be used. Further, according to the display symbols specified by JIS L 0120, suitable sewing methods are "101", "209", "301", "304", "401", "406", "407", and "410". , "501", "502", "503", "504", "505", "509", "512", "514", "602" and "605" It can be illustrated. Even if the heat radiating member 20 is compressed by pressing from the heat source and becomes flat, the heat radiating structure 1 may follow and adhere to the heat source because the connecting member 30 bends following the deformation of the heat radiating member 20. can.

(5) Fixing Member In the fixing member 10, when a plurality of heat radiating members 20 are arranged along a direction orthogonal to the longitudinal direction, one side of the four sides surrounding the plurality of heat radiating members 20 is open along the longitudinal direction. It is a substantially U-shaped member. In this embodiment, as shown in FIG. 1, the fixing member 10 is substantially opened on the left side along the longitudinal direction (Y direction shown in FIG. 1) among the four sides surrounding the plurality of heat radiating members 20. It is a U-shaped member. The fixing member 10 may be a substantially U-shaped member in which one side on the right side of the two sides along the longitudinal direction is opened. The fixing member 10 preferably uses a sewing machine or the like together with the plurality of heat radiating members 20 in a state where both ends of the plurality of heat radiating members 20 in the longitudinal direction are placed on two sides along a direction orthogonal to the longitudinal direction. Is sewn with the connecting member 30. In this way, the connecting member 30 is connected by fixing both ends of the plurality of heat radiating members 20 in the longitudinal direction to the fixing member 10. It is preferable that the fixing member 10 has a sufficient size so that the space surrounded by the substantially U shape can pass the heat source. However, the space surrounded by the substantially U-shape of the fixing member 10 may have a size that prevents the heat source from being inserted. The fixing member 10 is preferably made of resin or rubber, and more preferably made of PET film.

The fixing member 10 enables positioning of the plurality of heat radiating members 20 in the heat radiating structure 1 by sewing and fixing the plurality of heat radiating members 20 with the connecting member 30. In order to realize high heat transfer efficiency, it is desirable to dissipate heat uniformly from each of a large number of heat sources so that the temperature of each of the large number of heat sources becomes uniform. For that 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. In the heat radiating structure 1, since a plurality of heat radiating members 20 are positioned by the fixing member 10 and the connecting member 30, the heat radiating member 20 can be surely brought into contact with each heat source. Therefore, the heat dissipation structure 1 can enhance the uniformity of heat dissipation in each of a large number of heat sources, and can realize high heat transfer efficiency. The fixing member 10 is not limited to resin or rubber as long as it is a material that is not deformed by heat radiation from a heat source, and may be formed of, for example, metal, plastic, wood, ceramics, or the like.

The distance L1 between the heat radiating members 20 becomes narrow when the heat radiating member 20 is crushed by being pressed by the heat source. If the heat radiating member 20 is hardly crushed, the adhesion between the heat conductive sheet 21 and the heat source or the like may be lowered. The thickness of the heat radiating member 20 suitable for reducing such risk when compressed in the vertical direction, that is, in the direction from the heat source to the cooling portion including the cooling member is at least the pipe diameter of the heat radiating member 20 (= circle-equivalent diameter). : 80% of D). 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 20 is cut perpendicular to the longitudinal direction thereof. When the heat radiating member 20 is a cylinder having a perfect circular cross section, its diameter is the same as the circle-equivalent diameter. When the heat radiating member 20 receives the above compression, it can be considered to be deformed so that the surface in contact with the heat source and the cooling portion is a flat surface and the direction of the distance L1 between the heat radiating members 20 is a substantially arc cross section (FIG. 2D). See enlarged view). If the distance L1 is made sufficiently large, the heat radiating member 20 does not come into contact with the adjacent heat radiating member 20. On the contrary, 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 the adjacent heat radiating member 20 and not be further crushed. If the distance L1 is set to 11.4% or more of the circle-equivalent diameter D of the heat-dissipating member 20, the heat-dissipating members 20 come into contact with each other when the heat-dissipating member 20 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. Therefore, in the heat radiating structure 1, it is preferable that a plurality of heat radiating members 20 are arranged so that the distance L1 between the heat radiating members 20 is 11.4% or more of the circle-equivalent diameter D of the heat radiating member 20. However, the smaller the distance L1, the more stably the plurality of heat radiating members 20 can be connected when they are connected by the connecting member 30. It is more preferable that the distance L1 is set in consideration of these points. 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 radiating member 20 deformed by pressing from a heat source (enlarged view of FIG. 3D and F of FIG. 4). See the enlarged view of). By configuring the heat radiating structure 1 in this way, even if the heat radiating member 20 is compressed in the vertical direction by pressing from the heat source, it is possible to suppress the possibility that the heat source comes into contact with the fixing member 10 and is not further crushed, and heat is radiated. When the member 20 is compressed to a thickness of 80% of the circle-equivalent diameter D and deformed, it is possible to prevent the member 20 from becoming an obstacle to the deformation. It is preferable that the surface of the heat radiating member 20 on the cooling portion side (lower side of FIGS. 3 and 4) is at the same height as the surface of the fixing member 10 on the cooling portion side, or slightly protrudes toward the cooling portion. .. This is because the fixing member 10 is easily brought into contact with the cooling portion.

(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 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 hinder heat conduction when heat is transferred from a heat source to the heat conductive 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 oils are roughly classified into straight silicone oils and modified silicone oils. 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 heat conductivity, it is applied to the surface of the heat conductive sheet 21 and is interposed 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 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.

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 radiating structure 1 or the battery described later, but is an additional configuration that can be suitably provided. This also applies to the subsequent embodiments.

In the heat radiating structure 1, both ends of the plurality of heat radiating members 20 in the longitudinal direction (Y direction shown in FIG. 1) are sewn together with the fixing member 10 by the connecting member 30, so that the plurality of heat radiating members 20 are sewn onto the fixing member 10. It is fixed. As a result, both ends of the heat radiating member 20 in the longitudinal direction are fixed and crushed by being pressed by the heat source. Therefore, even if the lower ends of the plurality of heat sources are not flat, the heat conductive sheet 21 and the lower ends are held together. Good contact. In the heat radiating structure 1, since the heat radiating member 20 is positioned by the fixing member 10 and the connecting member 30, the variation of the distance L1 between the heat radiating members 20 becomes small even when the heat radiating member 20 is crushed by being pressed by the heat source. Therefore, the heat dissipation structure 1 can enhance the uniformity of heat dissipation in each of a large number of heat sources. Further, since each heat radiating member 20 has a structure in which the heat conductive sheet 21 is spirally wound around the outer surface of the cushion member 22, the heat radiating structure 1 does not excessively restrain the deformation of the cushion member 22. The plurality of heat radiating members 20 are not limited to being arranged so that the distances L1 between the heat radiating members 20 are evenly spaced. The heat radiating structure 1 is preferably arranged at a different distance L1 so that the heat radiating members 20 are densely packed at the position of the heat source having a high temperature among the plurality of heat sources. That is, the heat radiating structure 1 has the heat radiating members 20 in contact with the high temperature heat source so that the number of the heat radiating members 20 in contact with the high temperature heat source is larger than the number of the heat radiating members 20 in contact with the other heat source. It is preferable to reduce the distance L1 of. As described above, the heat radiating structure 1 can be easily and surely positioned with the heat source so that the heat radiating property of each of the plurality of heat sources becomes uniform according to the form of the heat source and the like.

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

FIG. 5 shows a plan view of the heat radiating structure according to the second embodiment. FIG. 6 shows a plan view of the aggregate of the heat radiating structure according to the second embodiment and an enlarged view of a part G thereof.

The heat radiating structure 1a according to the second embodiment has a structure similar to that of the heat radiating structure 1 according to the first embodiment, but the first embodiment is provided with the fixing member 10a instead of the fixing member 10. It is different from the heat dissipation structure 1.

The heat radiating structure 1a is configured to be able to be fitted with another heat radiating structure 1a. That is, the heat radiating structure 1a can form an aggregate 70 of the heat radiating structures (hereinafter, also simply referred to as "aggregate 70") by fitting with the plurality of other heat radiating structures 1a (hereinafter, also simply referred to as "aggregate 70"). See FIG. 6). The aggregate 70 formed in this way can reliably bring the lower end portions of the heat source into contact with the heat conductive sheet 21 even when the area of the lower end portions of the plurality of heat sources is large. Therefore, the heat radiating structure 1a can be fitted with at least one or more other heat radiating structures 1a to form an aggregate 70 according to the area of the lower end portions of the plurality of heat sources to be radiated. In FIG. 6, the aggregate 70 is formed by fitting four heat radiating structures 1a, but the number of heat radiating structures 1a forming the aggregate 70 is not particularly limited.

The fixing member 10a includes a fitting portion 15 that can be fitted with the fixing member 10a of the other heat radiating structure 1a. The fitting portion 15 is a portion that can be fitted with the fixing member 10a of another adjacent heat radiating structure 1a when the heat radiating structure 1a forms the aggregate 70. In this embodiment, the fitting portion 15 is a portion protruding in a rectangular shape or a portion recessed in a rectangular shape (see FIG. 6G). The assembly 70 includes, for example, a fitting portion 15 that protrudes in a rectangular shape from the fixing member 10a of the heat radiating structure 1a, and a fitting portion 15 that is recessed in a rectangular shape from the fixing member 10a of another adjacent heat radiating structure 1a. Are formed by fitting (so-called puzzle-type connection). The position and number of the fitting portions 15 are not limited as long as they can be fitted with the fitting portions 15 of at least one other heat radiating structure 1a adjacent to each other. Since the heat radiating structure 1a has the same configuration as the heat radiating structure 1 according to the first embodiment except for the fixing member 10a, detailed description thereof will be omitted.

FIG. 7 shows a part of the modified example 1 of the heat radiating structure according to the second embodiment in the same view as the enlarged view of FIG.

In the first modification, the heat radiating structure 1a is different from the heat radiating structure 1a according to the second embodiment described above in that the fixing member 10a includes the fitting portion 15a instead of the fitting portion 15. In the first modification, the configuration other than the fitting portion 15a is the same as that of the heat radiating structure 1a according to the second embodiment described above, and thus detailed description thereof will be omitted. Further, in the first modification, the position and the number of the fitting portions 15a in the fixing member 10a are the same as the fitting portions 15 of the heat radiating structure 1a according to the second embodiment described above.

The fitting portion 15a is a hole into which a substantially T-shaped protruding portion or the substantially T-shaped protruding portion can be inserted. In the assembly 70 of the heat radiating structure, for example, the fitting portion 15a protruding in a substantially T shape of the fixing member 10a of the heat radiating structure 1a is inserted into a hole (fitting) of the fixing member 10a of another adjacent heat radiating structure 1a. Part) It is formed by inserting it into 15a and fitting it. In this way, also in the modified example 1, the heat radiating structure 1a can form the aggregate 70 by fitting with the plurality of other heat radiating structures 1a.

FIG. 8 shows a part of the modified example 2 of the heat radiating structure according to the second embodiment in the same view as the enlarged view of FIG.

In the second modification, the heat radiating structure 1a is different from the heat radiating structure 1a according to the second embodiment described above in that the fixing member 10a includes the fitting portion 15b instead of the fitting portion 15. In the second modification, the configuration other than the fitting portion 15b is the same as that of the heat radiating structure 1a according to the second embodiment described above, and thus detailed description thereof will be omitted. Further, in the second modification, the position and the number of the fitting portions 15b in the fixing member 10a are the same as those of the fitting portion 15 of the heat radiating structure 1a according to the second embodiment described above.

The fitting portion 15b is a portion that protrudes in a substantially T shape or a portion that is recessed in a substantially T shape. The fitting portion 15b is preferably formed so that the portion protruding in a substantially T shape is larger than the portion recessed in a substantially T shape. The assembly 70 of the heat radiating structure is, for example, a fitting portion 15b protruding in a substantially T shape of the fixing member 10a of the heat radiating structure 1a and a substantially T shape of the fixing member 10a of another adjacent heat radiating structure 1a. It is formed by fitting with the fitting portion 15b recessed in. In this way, also in the second modification, the heat radiating structure 1a can form the aggregate 70 by fitting with the plurality of other heat radiating structures 1a.

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

FIG. 9 shows a plan view of the heat radiating structure according to the third embodiment.

The heat radiating structure 1b according to the third embodiment has a structure similar to that of the heat radiating structure 1 according to the first embodiment, but the first embodiment is provided with the fixing member 10b instead of the fixing member 10. It is different from the heat dissipation structure 1.

In the fixing member 10b, when a plurality of heat radiating members 20 are arranged along a direction orthogonal to the longitudinal direction, one side of the four sides surrounding the plurality of heat radiating members 20 is opened along the direction orthogonal to the longitudinal direction. It is a member having a substantially U-shape. In this embodiment, as shown in FIG. 9, the fixing member 10b is the lower one side along the direction orthogonal to the longitudinal direction (X direction shown in FIG. 1) among the four sides surrounding the plurality of heat radiating members 20. Is a substantially U-shaped member with an opening. The fixing member 10b may be a substantially U-shaped member in which the upper side of the two sides along the direction orthogonal to the longitudinal direction is opened. The fixing member 10b is preferably formed together with the plurality of heat radiating members 20 in a state in which one end portion of the plurality of heat radiating members 20 in the longitudinal direction is placed on one side along a direction orthogonal to the longitudinal direction of the heat radiating member 20. It is sewn by the connecting member 30 using a sewing machine or the like. Further, the fixing member 10b preferably includes the other end portion in the longitudinal direction of the plurality of heat radiating members 20 (the end portion on the opening side of the fixing member 10b) and the longitudinal length of the heat radiating member 20 among the three sides forming the fixing member 10b. The opening side ends of the two sides along the direction are sewn by the connecting member 30 using a sewing machine or the like. In this way, the plurality of heat radiating members 20 are connected by the fixing member 10b and the connecting member 30. Therefore, the heat radiating structure 1b can be easily and surely positioned with the heat source. Since the other configurations of the fixing member 10b are the same as those of the fixing member 10 of the heat radiating structure 1 according to the first embodiment, detailed description thereof will be omitted.

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

FIG. 10 shows a plan view of the heat radiating structure according to the fourth embodiment. FIG. 11 shows a plan view of an aggregate of heat dissipation structures according to the fourth embodiment.

The heat radiating structure 1c according to the fourth embodiment has a structure similar to that of the heat radiating structure 1b according to the third embodiment, but the third embodiment includes a fixing member 10c instead of the fixing member 10b. It is different from the heat dissipation structure 1b.

The heat radiating structure 1c is configured to be matable with another heat radiating structure 1c. That is, the heat radiating structure 1c can form an aggregate 70a of the heat radiating structures (hereinafter, also simply referred to as "aggregate 70a") by fitting with a plurality of other heat radiating structures 1c (hereinafter, also simply referred to as "aggregate 70a"). See FIG. 11). The aggregate 70a formed in this way can reliably bring the lower end portions of the heat source into contact with the heat conductive sheet 21 even when the area of the lower end portions of the plurality of heat sources is large. Therefore, the heat radiating structure 1c can be fitted with at least one or more other heat radiating structures 1c to form an aggregate 70a according to the area of the lower end portions of the plurality of heat sources to be radiated. In FIG. 11, the aggregate 70a is formed by fitting four heat radiating structures 1c, but the number of heat radiating structures 1c forming the aggregate 70a is not particularly limited.

The fixing member 10c includes a fitting portion 15 that can be fitted with the fixing member 10c of another heat radiating structure 1c. The fitting portion 15 is a portion that can be fitted with the fixing member 10c of another adjacent heat radiating structure 1c when the heat radiating structure 1c forms the aggregate 70a. In this embodiment, the fitting portion 15 is a portion protruding in a rectangular shape or a portion recessed in a rectangular shape, similarly to the fitting portion 15 of the heat radiating structure 1a according to the second embodiment. The assembly 70a includes, for example, a fitting portion 15 protruding in a rectangular shape from the fixing member 10c of the heat radiating structure 1c, and a fitting portion 15 recessed in a rectangular shape from the fixing member 10c of another adjacent heat radiating structure 1c. Are formed by fitting (so-called puzzle-type connection). The position and number of the fitting portions 15 are not limited as long as they can be fitted with the fitting portions 15 of at least one other heat radiating structure 1c adjacent to each other. Since the heat radiating structure 1c has the same configuration as the heat radiating structure 1b according to the third embodiment except for the fixing member 10c, detailed description thereof will be omitted. In the heat radiating structure 1c, the shape, position, and number of the fitting portions 15 included in the fixing member 10c are such that the fitting portions 15 can be fitted with at least the fitting portions 15 of other adjacent heat radiating structures 1c. There are no restrictions on such things. Therefore, in the heat radiating structure 1c as well, as in the heat radiating structure 1a according to the second embodiment, the fixing member 10c may include fitting portions 15a and 15b instead of the fitting portion 15 (FIG. See 7 and 8).

2. Method for Manufacturing Heat Dissipating Structure Next, an example of a suitable manufacturing method for the heat radiating structure 1 according to the first embodiment 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. 12 shows a diagram for explaining a manufacturing process of a heat radiating member constituting the heat radiating structure.

First, the cushion member 22 having the through-passage 23 is formed. Next, an adhesive is applied to the outer surface of the cushion member 22. Next, after the band-shaped heat conductive sheet 21 is spirally wound on the outer surface of the cushion member 22, if there is a portion of the heat conductive sheet 21 protruding from both ends of the cushion member 22, the protruding portion is cut. Alternatively, the cushion member 22 is cut together. Finally, the heat conductive oil is applied to the surface of the heat conductive sheet 21. It is also possible to fix the cushion member 22 and the heat conductive sheet 21 without interposing an adhesive. In that case, a cushion member 22 in a state before being completely cured is prepared, and a band-shaped heat conductive sheet 21 is wound around the outer surface thereof. After that, the cushion member 22 is heated to be completely cured, and the heat conductive sheet 21 is fixed to the outer surface of the cushion member 22.

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 fixing member 10 is arranged in a state where a plurality of heat radiating members 20 manufactured by the above-mentioned manufacturing method are arranged in a direction orthogonal to the longitudinal direction thereof, and the plurality of heat radiating members 20 and the fixing member 10 are arranged. Is sewn and fixed by the connecting member 30. In this case, the fixing member 10 is provided with both ends of the plurality of heat radiating members 20 in the longitudinal direction on two sides along the direction orthogonal to the longitudinal direction of the heat radiating member 20 among the three sides forming a substantially U shape. It is preferable to arrange them so as to. Further, in the connecting member 30, it is preferable to sew the fixing member 10 and both ends of the heat radiating member 20 in the longitudinal direction in a state where both ends of the plurality of heat radiating members 20 in the longitudinal direction are placed on the fixing member 10. ..

Similar to the heat radiating structure 1, the heat radiating structure 1a according to the second embodiment is a fixing member 10a in a state where a plurality of heat radiating members 20 manufactured by the above-mentioned manufacturing method are arranged in a direction orthogonal to the longitudinal direction thereof. Is arranged, and the plurality of heat radiating members 20 and the fixing member 10a are sewn and fixed by the connecting member 30.

In the heat radiating structures 1b and 1c according to the third embodiment and the fourth embodiment, a plurality of heat radiating members 20 manufactured by the above-mentioned manufacturing method are arranged in a direction orthogonal to the longitudinal direction thereof, and the fixing members 10b, It is manufactured by arranging 10c and fixing a plurality of heat radiating members 20 with fixing members 10b and 10c and connecting members 30. In this case, the fixing members 10b and 10c have one end in the longitudinal direction of the plurality of heat radiating members 20 mounted on one of the three sides forming a substantially U shape along the direction orthogonal to the longitudinal direction of the heat radiating member 20. It is preferably arranged so that it is placed. Further, the connecting member 30 is sewn between the fixing members 10b and 10c and one end portion of the heat radiating member 20 in the longitudinal direction in a state where one end portions of the plurality of heat radiating members 20 in the longitudinal direction are placed on the fixing members 10b and 10c. It is preferable to attach it. Further, the connecting member 30 includes the other ends of the plurality of heat radiating members 20 in the longitudinal direction (ends on the opening side of the fixing members 10b and 10c), and the heat radiating member 20 of the three members forming the fixing members 10b and 10c. It is preferable that the ends on the opening side of the two sides along the longitudinal direction are sewn by the connecting member 30.

An example of a suitable manufacturing method of a modified example of the heat radiating structure 1 will be described. In this modification, the heat radiating member 20 constituting the heat radiating structure 1 described above is replaced with the heat radiating member 20a, but the heat radiating member 20 is manufactured by the same manufacturing method as the heat radiating structure 1 described above. Is omitted. Hereinafter, a suitable manufacturing method of the heat radiating member 20a will be described.

FIG. 13 shows a diagram for explaining a preferable manufacturing process of a modified example of the heat radiating member constituting the heat radiating structure.

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 20a. The following method can be exemplified as a manufacturing method in which an adhesive is not interposed between the heat conductive sheet 21 and the cushion member 22. 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 20a includes a gangway 23a penetrating in the longitudinal direction thereof. The through-passage 23a also penetrates in the direction of the outer surface of the heat-dissipating member 20a, unlike the heat-dissipating member 20 in the above-described embodiment. 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 in which the heat conductive sheet 21 and the cushion member 22 integrally travel in one direction in a spiral shape. 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.

The heat radiating structures 1a, 1b, and 1c can also be provided with the heat radiating member 20a instead of the heat radiating member 20. In this case, the heat radiating structures 1a, 1b, 1c can be manufactured by the same manufacturing method as the above-mentioned heat radiating structures 1a, 1b, 1c except that the heat radiating member 20 is replaced with the heat radiating member 20a.

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

FIG. 14 shows a vertical cross-sectional view of a battery including a heat dissipation structure. 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 portion.

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 above the battery cell 50 so as to project. 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 interpreted to include not only cooling water but also 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. 14), the heat radiating structure 1 has a thickness direction of the heat radiating structure 1 between the battery cell 50 and the bottom portion 42 provided with the water cooling pipe 43. Is compressed to. 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. Further, since the heat radiating structure 1 includes the fixing member 10, the operator can hold the fixing member 10 and attach the heat radiating structure 1 to the battery 1, which improves workability. The battery 40 may include the above-mentioned heat radiating structures 1a, 1b, 1c instead of the heat radiating 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 in various modifications.

FIG. 15 shows a cross-sectional view when the battery cell is laid horizontally so as to be in contact with the side surface of the battery cell on the heat radiating structure, a partially enlarged view thereof, and a partial cross-sectional view when the battery cell expands during charging and discharging. Each is shown.

In the first embodiment and the second embodiment described above, the situation in which the battery cell 50 is vertically oriented and the heat radiating structures 1, 1a are brought into contact with the lower end thereof has been described. Not limited. As shown in FIG. 15, the battery cell 50 may be arranged so that the side surface of the battery cell 50 is in contact with the heat radiating members 20 and 20a of the heat radiating structures 1, 1a. The temperature of the battery cell 50 rises during charging and discharging. If the container itself of the battery cell 50 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. 15, since the heat radiating members 20 and 20a constituting the heat radiating structure 1, 1a can be deformed according to the shape of the outer surface of the battery cell 50, heat is radiated even during charging and discharging. Can maintain high sex. Further, also in the third embodiment and the fourth embodiment described above, the battery cell 50 is arranged so that the side surface of the battery cell 50 is in contact with the heat radiating members 20 and 20a of the heat radiating structures 1b and 1c. Is also good.

Further, in the heat radiating structures 1a and 1c, the fixing members 10a and 10c may include two or more types of fitting portions 15, 15a and 15b.

Further, the fixing members 10, 10a, 10b, 10c (hereinafter, collectively referred to as "fixing member 10 and the like") have positioning pins provided in the housing 41 (bottom 42 and the like) of the battery 40. One or more positioning holes that can be inserted may be formed. 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, the battery 40 and the heat radiating structures 1, 1a, 1b, 1c (hereinafter, collectively referred to as "heat radiating structure 1 and the like") can be easily positioned. Become. The shapes and positions of the positioning holes and the positioning pins are not particularly limited.

Further, the heat radiating structures 1, 1a may be fixed to the fixing members 10, 10a at both ends in the longitudinal direction of the plurality of heat radiating members 20 by a method such as adhesion or fitting. In this case, the heat radiating structures 1, 1a may or may not include the connecting member 30. Further, the heat radiating structures 1, 1a may be connected by a connecting member 30 at positions other than both ends in the longitudinal direction, such as a central portion in the longitudinal direction of the plurality of heat radiating members 20, 20a. In this case, in the heat radiating structure 1, 1a, only the plurality of heat radiating members 20, 20a may be connected by the connecting members 30 at positions other than both ends in the longitudinal direction thereof, or the plurality of heat radiating members 20, 20a and The fixing members 10 and 10a may be connected by the connecting member 30 at positions other than both ends in the longitudinal direction.

Further, in each of the above-described embodiments, in the heat radiating structures 1, 1a, the fixing members 10 and 10a have a plurality of sides along the longitudinal direction of the plurality of heat radiating members 20 among the three sides forming a substantially U shape. The heat radiating member 20 is arranged so as to be outside the end portion in the lateral direction (direction orthogonal to the longitudinal direction). However, the fixing members 10 and 10a may be arranged so that one side along the longitudinal direction overlaps the end portion in the lateral direction or is inside the end portion in the lateral direction.

Further, in each of the above-described embodiments, in the heat radiating structures 1, 1a, the fixing members 10 and 10a are orthogonal to the lateral direction (longitudinal direction) of a plurality of heat radiating members 20 among the three sides forming a substantially U shape. The two sides along the direction) are arranged so as to overlap with both ends of the plurality of heat radiating members 20 in the longitudinal direction. However, the fixing members 10 and 10a may be arranged so that the two sides along the lateral side are outside the both ends in the longitudinal direction. In this case, the connecting member 30 sews one side of the three sides forming the fixing members 10 and 10a along the longitudinal direction of the plurality of heat radiating members 20 and both ends of the plurality of heat radiating members 20 in the longitudinal direction. It is preferable to attach and connect.

Further, the heat radiating structures 1b and 1c are formed on one side along the direction orthogonal to the longitudinal direction of the plurality of heat radiating members 20 among the three sides forming the fixing members 10b and 10c by a method such as adhesion or fitting. One end of the heat radiating member 20 in the longitudinal direction may be fixed. In this case, the heat radiating structures 1b and 1c may or may not be sewn by the connecting member 30 on one side of the fixing members 10b and 10c along the direction orthogonal to the longitudinal direction. good. Further, the heat radiating structures 1b and 1c do not have to be connected by sewing the other ends (opening side ends of the fixing members 10b and 10c) of the plurality of heat radiating members 20 in the longitudinal direction with the connecting member 30. Further, the heat radiating structures 1b and 1c may be connected by the connecting member 30 at positions other than both ends in the longitudinal direction, such as the central portion in the longitudinal direction of the plurality of heat radiating members 20 and 20a. In this case, in the heat radiating structures 1b and 1c, only the plurality of heat radiating members 20 and 20a may be connected by the connecting members 30 at positions other than both ends in the longitudinal direction thereof, or the plurality of heat radiating members 20 and 20a and the heat radiating members 20 and 20a may be connected by the connecting members 30. The fixing members 10b and 10c may be connected by the connecting member 30 at positions other than both ends in the longitudinal direction.

Further, in each of the above-described embodiments, in the heat radiating structures 1b and 1c, the fixing members 10b and 10c have a plurality of two sides along the longitudinal direction of the plurality of heat radiating members 20 out of the three sides forming a substantially U shape. The heat radiating member 20 is arranged so as to be outside from both sides in the lateral direction. However, the fixing members 10b and 10c may be arranged so that the two sides along the longitudinal direction overlap the both sides in the lateral direction or are inside the both sides in the lateral direction.

Further, in each of the above-described embodiments, in the heat radiating structures 1b and 1c, the fixing members 10b and 10c have one side of the three sides forming a substantially U shape along the lateral direction of the plurality of heat radiating members 20. It is arranged so as to overlap with one end of the plurality of heat radiating members 20 in the longitudinal direction. However, the fixing members 10b and 10c may be arranged so that one side along the lateral direction is outside the one end portion in the longitudinal direction. In this case, the connecting member 30 is a plurality of the three sides forming the fixing members 10b, 10c, similarly to the other ends of the plurality of heat radiating members 20 in the longitudinal direction (opening side ends of the fixing members 10b, 10c). It is preferable to sew and connect the two sides of the heat radiating member 20 along the longitudinal direction and one end of the plurality of heat radiating members 20 in the longitudinal direction.

Further, the shape of the fixing member 10 or the like is not particularly limited, and is, for example, an ellipse, a circle, a triangle, or the like as long as it has a shape capable of fixing at least one end of the plurality of heat radiating members 20, 20a in the longitudinal direction. You may.

Further, in each of the above-described embodiments, the fixing member 10 or the like is a connecting member in which the heat radiating members 20 and 20a are connected so that the surface on the bottom 42 side is at the same position as the surface on the bottom 42 side of the heat radiating members 20 and 20a. 30 is fixed. However, the fixing member 10 or the like is a connecting member connecting the heat radiating members 20 and 20a so that the surface of the fixing member 10 or the like on the battery cell 50 side is at the same position as the surface of the heat radiating members 20 and 20a on the battery cell 50 side. 30 may be fixed. Further, the fixing member 10 or the like may be arranged at a middle position in the height direction of the heat radiating members 20, 20a (the direction from the battery cell 50 toward the bottom 42).

Further, the heat radiating member 20 does not have to have a through-passage 23 formed in the cushion member 22. In that case, the heat radiating member 20 has a structure in which the cushion member 22 is filled in the through-passage of the spiral heat conductive sheet 21. The gangway may not be formed in the cushion member 22 as long as it is formed by at least the winding structure of the heat conductive sheet 21 among 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 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 heat radiating structure 1a may be provided in the battery 40.

1,1a, 1b, 1c ... Heat dissipation structure 10,10a, 10b, 10c ... Fixing member, 15,15a, 15b ... Fitting part, 20,20a ... Heat dissipation member, 21. .. Heat conduction sheet, 22 ... Cushion member, 23, 23a ... Through path, 30 ... Connecting member, 40 ... Battery, 41 ... Housing, 45 ... Cooling member, 50 ... Battery cell (an example of heat source).

Claims (11)

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 radiating member is
A heat conductive sheet having a shape that advances while spirally winding to transfer heat from the heat source,
A cushion member provided on the annular back surface of the heat conductive sheet and easily deformed according to the surface shape of the heat source as compared with the heat conductive sheet.
A gangway that penetrates in the direction of travel while winding the heat conductive sheet,
With
A fixing member capable of fixing the plurality of heat radiating members in a state of being arranged in a direction orthogonal to the longitudinal direction thereof is provided.
The fixing member is a substantially U-shaped member in which one of the four sides surrounding the plurality of heat radiating members is opened in a state where the plurality of heat radiating members are arranged along a direction orthogonal to the longitudinal direction. A heat dissipation structure characterized by being present. A connecting member for connecting the plurality of heat radiating members in a state of being arranged in a direction orthogonal to the longitudinal direction is provided.
The heat radiating structure according to claim 1, wherein the connecting member is connected by fixing at least one end of the plurality of heat radiating members in the longitudinal direction to the fixing member. The fixing member is a substantially U-shaped member in which one side along the longitudinal direction is opened among the four sides surrounding the plurality of heat radiating members.
The heat radiating structure according to claim 2, wherein the connecting member is connected by fixing both ends of the plurality of heat radiating members in the longitudinal direction to the fixing member. The heat radiating structure according to claim 2 or 3, wherein the connecting member is made of a thread. It is configured so that it can be fitted with the other adjacent heat dissipation structure.
The heat radiating structure according to any one of claims 1 to 4, wherein the fixing member includes a fitting portion that can be fitted with the fixing member of the other heat radiating structure. The heat radiating 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 radiating member deformed by pressing from the heat source. body. The cushion member is a tubular cushion member having the gangway in the longitudinal direction.
The heat radiating structure according to any one of claims 1 to 6, wherein the heat conductive sheet spirally winds an outer surface of the tubular cushion member. The heat-dissipating structure according to any one of claims 1 to 6, wherein the cushion member is a spiral cushion member that is spirally wound along the annular back surface of the heat conductive sheet. .. The method according to any one of claims 1 to 8, 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 ninth aspect of claim 9, 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. 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 10 is provided between the battery cells and the housing. A battery with the heat dissipation structure described in the section.

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