JP2019220261A - Heat dissipation structure and battery - Google Patents

Abstract

To provide a heat dissipation structure which is less dependent on unevenness of the surface of a heat source, has a large contact area with the heat source, can obtain high heat dissipation efficiency, and can reduce the weight, and a battery having the same.SOLUTION: The present invention relates to: a heat dissipation structure 1a' that enhances heat dissipation from a heat source 10, and includes a sheet 2a having a plurality of bag-shaped protrusions 3a on at least one side; and a battery 20.SELECTED DRAWING: Figure 5

Description

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

  Control systems for automobiles, aircraft, ships, or home or commercial electronics are becoming more precise and complex, and with it, the integration density of small electronic components on circuit boards is ever increasing. . As a result, it is strongly desired to solve the problem and shorten the life of electronic components due to heat generation around the circuit board.

  To achieve rapid heat dissipation from the circuit board, conventionally, the circuit board itself is made of a material with excellent heat dissipation, and a single heat sink or a means for driving a cooling fan is used singly or in combination. Is being done. Of these, the method of forming the circuit board itself from a material having excellent heat dissipation properties, such as diamond, aluminum nitride, cubic boron nitride, etc., significantly increases the cost of the circuit board. In addition, the arrangement of the cooling fan causes a problem that a rotating device such as a fan malfunctions, necessity of maintenance for preventing the malfunction, and difficulty in securing an installation space arise. On the other hand, the radiation fin has a large surface area by forming a large number of columnar or flat protruding portions using a metal (for example, aluminum) having a high thermal conductivity, so that heat radiation can be further improved. Since it is a simple member, it is generally used as a heat dissipating component (see Patent Document 1).

  By the way, at present, movements to gradually convert conventional gasoline or diesel vehicles to electric vehicles have been activated around the world for the purpose of reducing the burden on the global environment. In particular, France, the Netherlands, Germany and other European nations, as well as China, have declared a switch from gasoline and diesel vehicles to fully electric vehicles by 2040. The spread of electric vehicles has issues such as the development of high-performance batteries and the installation of many charging stations. In particular, technical development for enhancing the charge / discharge function of lithium-based automotive batteries has become a major issue. It is well known that the above-mentioned automobile battery cannot sufficiently exhibit a charge / discharge function at a high temperature of 60 degrees Celsius or higher. For this reason, as with the circuit board described above, it is important to enhance the heat dissipation of the battery.

JP 2008-243999

  In order to further enhance the heat radiation efficiency from the heat source, a heat radiation structure that is less dependent on the unevenness of the surface of the heat source and has a large contact area with the heat source is required. In addition, the weight reduction of the heat dissipation structure is also an important factor.

  SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heat dissipation structure that is less dependent on unevenness of the surface of a heat source, has a high contact area with the heat source, can obtain high heat dissipation efficiency, and can reduce the weight of the heat dissipation structure. An object is to provide a body and a battery including the body.

(1) A heat dissipation structure according to an embodiment for achieving the above object is a heat dissipation structure that enhances heat dissipation from a heat source, and includes a sheet having a plurality of bag-shaped protrusions on at least one surface.

(2) The heat dissipation structure according to another embodiment preferably includes an elastic member that is in contact with the inside and / or the outside of the protruding portion and is more flexible and deformable than the sheet, and the elastic member includes the protruding portion. And contacting the protrusion to expose at least a portion of the outer top surface of the portion.

(3) In the heat dissipation structure according to another embodiment, preferably, the elastic member is disposed in a bag of the protruding portion.

(4) In the heat dissipation structure according to another embodiment, preferably, the sheet includes an opening of the protruding portion, and the opening is formed in the sheet so as not to pass through the elastic member. I have.

(5) In the heat dissipation structure according to another embodiment, preferably, the elastic member is a lining sheet that covers an inner surface of the bag of the protrusion.

(6) In the heat dissipation structure according to another embodiment, preferably, the elastic member is an outer lining sheet that covers a part of the bag outer surface of the protruding portion.

(7) A battery according to an embodiment for achieving the above object is a battery including a battery cell as one or more heat sources in a housing having a structure for flowing a cooling member. The heat dissipation structure is provided, and the heat dissipation structure is interposed between the battery cell and the cooling member.

(8) In the battery according to another embodiment, preferably, the heat dissipation structure is arranged with the protruding portion facing the battery cell side and the opposite side of the protruding portion facing the cooling member side. .

  ADVANTAGE OF THE INVENTION According to this invention, it is hard to depend on the unevenness | corrugation of the surface of a heat source, the contact area with a heat source is large, high heat dissipation efficiency can be obtained, and the weight reduction of a heat dissipation structure can be achieved.

FIG. 1 shows a plan view (1A) of the heat dissipation structure according to the first embodiment, a sectional view taken along the line AA in the plan view (1B), and a sectional view taken along the line BB in the plan view (1C). . FIG. 2 shows an enlarged view of FIG. 1 (1B). FIG. 3 shows a plan view (3A) of the heat dissipation structure according to the second embodiment, a sectional view taken along line AA in the plan view (3B), and a sectional view taken along line BB in the plan view (3C). . FIG. 4 shows an enlarged view of FIG. 3 (3B). FIG. 5 is a plan view (5A) of a heat dissipation structure according to a modification of the second embodiment, a sectional view taken along line AA in the plan view (5B), and a sectional view taken along line BB in the plan view (5C). Are respectively shown. FIG. 6 shows a plan view of a heat dissipation structure according to the third embodiment. 7 is a cross-sectional view (7A) of the heat dissipation structure of FIG. 6 taken along the line CC (7A), a cross-sectional view of the heat dissipation structure taken along the line CC (7B) of Modification Example 1, and a heat treatment structure of Modification Example 2 of C2. A cross-sectional view (7C) taken along line -C and a cross-sectional view (7D) similar to each modification of Modification 3 of the heat dissipation structure are shown. FIG. 8 shows a longitudinal sectional view (8A) of a state where the battery according to the first embodiment is assembled, and a longitudinal sectional view (8B) of a state after the battery is assembled. FIG. 9 shows a longitudinal sectional view (9A) of a situation where the battery according to the second embodiment is assembled, and a longitudinal sectional view (9B) of a state after the battery is assembled. FIG. 10 shows a longitudinal sectional view (10A) of a situation where the battery according to the third embodiment is assembled, and a longitudinal sectional view (10B) of a state after the battery is assembled. FIG. 11 shows a longitudinal sectional view (11A) of a situation in which a battery according to Modification 1 of the third embodiment is assembled (11A) and a longitudinal sectional view (11B) of a state after the battery is assembled.

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

1. Heat dissipation structure (first embodiment)
FIG. 1 shows a plan view (1A) of the heat dissipation structure according to the first embodiment, a sectional view taken along the line AA in the plan view (1B), and a sectional view taken along the line BB in the plan view (1C). . FIG. 2 shows an enlarged view of FIG. 1 (1B).

  The heat dissipating structure 1 is a heat dissipating structure that enhances heat dissipation from a heat source, and includes a sheet 2 having a plurality of bag-shaped protrusions 3 on at least one surface, and a sheet 2 that is in contact with the inside of the protrusions 3 and has a greater thickness than the sheet 2. A flexible and deformable elastic member 5. The elastic member 5 is in contact with the protrusion 3 so as to expose at least a part of the outer top surface of the protrusion 3. In this embodiment, the elastic member 5 is preferably arranged in the bag of the protrusion 3. The seat 2 has an opening 4 of the protrusion 3. In this embodiment, the opening 4 is preferably formed in the sheet 2 so as not to allow the elastic member 5 to pass therethrough. Hereinafter, details of the heat dissipation structure 1 will be described.

(1) Sheet The sheet 2 is preferably made of a material having a higher thermal conductivity than the elastic member 5 and is a member serving as a path for radiating heat from a heat source. The sheet may be read as “thermally conductive sheet”. The sheet 2 preferably contains carbon, metal and / or ceramics, or consists of a single substance thereof. The sheet 2 is, more preferably, a flexible sheet containing a carbon-based material. The sheet containing carbon (or a flexible sheet containing a carbon-based material) is preferably a sheet containing a carbon filler and a resin. The term "carbon" as used herein includes any structure of carbon (element symbol: C) such as graphite, carbon black having lower crystallinity than graphite, expanded graphite, diamond, and diamond-like carbon having a structure close to diamond. Is interpreted in a broad sense. In this embodiment, the sheet 2 can be a thin sheet obtained by curing a material in which graphite fibers and carbon particles are mixed and dispersed in a resin. In addition, the sheet 2 may be carbon fiber woven in a mesh shape, and may be blended or knitted.

  When the sheet 2 contains a resin, the resin may be more than 50% by mass or less than 50% by mass based on the total mass of the sheet 2. That is, it does not matter whether or not the sheet 2 is mainly made of a resin, as long as there is no major obstacle to heat conduction. As the resin, for example, a thermoplastic resin can be suitably 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. For example, polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyamide (PA), polyamideimide (PAI) and the like. The resin is dispersed in, for example, particles in the gaps between the carbon fillers before the sheet 2 is formed. In the sheet 2, AlN or diamond may be dispersed as a filler for further improving heat conduction in addition to the carbon filler and the resin. Further, an elastomer that is more flexible than the resin may be used instead of the resin.

The sheet 2 can also be a sheet containing metal and / or ceramics instead of or together with carbon as described above. As the metal, a metal having relatively high thermal conductivity such as aluminum, copper, or an alloy containing at least one of them can be selected. Further, as the ceramics, those having relatively high thermal conductivity such as AlN, Al ₂ O ₃ , cBN, and hBN can be selected.

  It does not matter whether the sheet 2 has excellent conductivity. The thermal conductivity of the sheet 2 is preferably 10 W / mK or more. The sheet 2 may be a metal sheet, for example, an aluminum, aluminum alloy, copper or stainless steel sheet. The sheet 2 is preferably a sheet that easily bends (or bends) regardless of its constituent material, and its thickness is not limited, but is preferably 0.05 to 5 mm, and 0.065 to 0.5 mm. Is more preferred. However, the thermal conductivity and flexibility of the sheet 2 decrease as the thickness increases, and the strength and weight of the sheet 2 increase as the thickness increases. The thickness of the sheet 2 is determined by comprehensively considering the strength, flexibility, thermal conductivity, and the like of the sheet 2.

  The sheet 2 includes a bag-shaped protruding portion 3 protruding from one surface in at least one surface XY plane in the thickness direction. This is evident from the fact that, as shown in FIG. 2, the protrusion 3 exists on one side with reference to the position L of the substantially flat surface of the sheet 2. Further, in this embodiment, the protruding portion 3 is not a completely closed bag, but has an opening 4 on the sheet 2 side. As shown in FIG. 2, the protruding portion 3 includes an elastic member 5 having a size that does not easily come out of the opening 4 in the bag. In this embodiment, the elastic member 5 is a sphere having a diameter D1 and is larger than the opening 4 having a diameter D2 (<D1). The sheet 2 has a function of transmitting heat from the surface on the opening 4 side to the outer top surface (also referred to as “top portion”) T of the protrusion 3 as shown by the line H in FIG. Therefore, when the sheet 2 is disposed between the heat source and the cooling member, heat from the heat source is transmitted through the sheet 2 and can be released to the cooling member. In addition, the sheet 2 may be integral with the protrusion 3, or may be separate from the protrusion 3 and joined to the protrusion 3. This is the same in the following embodiments.

  In this embodiment, the protruding portions 3 are arranged neatly at (X, Y) coordinate intersections in the XY plane of the sheet 2, but may be randomly arranged in the XY plane. . Further, the protrusion 3 may be elongated in either the X direction or the Y direction in FIG. 1A. In this case, the openings 4 may be formed to be elongated in the length direction of the protrusion 3, or may be arranged in a plurality of circular forms so as to be scattered along the length of the protrusion 3. Not only one elastic member 5 but also a plurality of elastic members 5 may be put in the bag of the protrusion 3. The arrangement and form of the protrusions 3, the form of the openings 4, and the number of the elastic members 5 are the same in other embodiments described below.

(2) Elastic Member The elastic member 5 is preferably a thermoset of silicone rubber, urethane rubber, isoprene rubber, ethylene propylene rubber, natural rubber, ethylene propylene diene rubber, nitrile rubber (NBR), styrene butadiene rubber (SBR), or the like. The composition includes a thermoplastic elastomer such as a urethane-based, ester-based, styrene-based, olefin-based, butadiene-based, or fluorine-based thermoplastic elastomer, or a composite thereof. The elastic member 5 is preferably made of a material having high heat resistance enough to maintain its shape without being melted or decomposed by heat transmitted through the sheet 2. In this embodiment, the elastic member 5 is more preferably made of urethane-based elastomer impregnated with silicone or silicone rubber. The elastic member 5 may be formed by dispersing a filler represented by AlN, Al ₂ O ₃ , cBN, hBN, diamond particles, or the like in rubber in order to increase the thermal conductivity as much as possible. The elastic member 5 may be one that does not contain bubbles, in addition to one that contains bubbles inside. The term “elastic member” means a member that is rich in flexibility and capable of elastically repeating compression and expansion. In this sense, it can be read as “rubber-like elastic body” or “cushion member”.

  The elastic member 5 has a surface in contact with the heat source and / or a surface on the cooling member side when the heat radiation structure 1 is compressed in the direction of its thickness (between the opening 4 and the top T of the protrusion 3). Has a function of making the heat radiation structure 1 easily adhere to the substrate. In many cases, the surface is not completely smooth and has steps and irregularities. If the elastic member 5 is not provided, only the compressed and crushed sheet 2 easily forms a gap between the sheet 2 and the surface in contact with the heat source and / or the surface on the cooling member side.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described. Portions common to the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 3 shows a plan view (3A) of the heat dissipation structure according to the second embodiment, a sectional view taken along line AA in the plan view (3B), and a sectional view taken along line BB in the plan view (3C). . FIG. 4 shows an enlarged view of FIG. 3 (3B).

  Unlike the heat dissipation structure 1 according to the first embodiment, the heat dissipation structure 1a according to the second embodiment includes a protrusion 3a having a bottomed cylindrical shape, and the opening 4a is provided with an elastic member (a column) in the protrusion 3a. (A shaped member) 5a is easily sized. For this reason, the elastic member 5a is adhered to the bottom surface of the protruding portion 3a inside the bag, so that it does not easily come out of the opening 4a. The constituent material of the sheet 2a, the arrangement state of the protrusions 3a, the constituent material of the elastic member 5a, and their modified examples are the same as those of the sheet 2, the protrusion 3 and the elastic member 5 in the first embodiment.

  As in this embodiment, the protrusion 3a is not limited to the form of a round bag (see the first embodiment), and may be a cylindrical member with a bottom. Further, the protruding portion may be in the form of a polygonal cylinder or bag having a bottom. Further, the protruding portion 3a may be in the form of an elongated groove in either the X direction or the Y direction. The opening 4a may be formed in a size that does not allow the elastic member 5a to pass through, as in the first embodiment. In that case, the elastic member 5a does not have to be adhered inside the bag.

  FIG. 5 is a plan view (5A) of a heat dissipation structure according to a modification of the second embodiment, a sectional view taken along line AA in the plan view (5B), and a sectional view taken along line BB in the plan view (5C). Are respectively shown.

  A heat dissipation structure 1a 'according to a modification of the second embodiment is a heat dissipation structure that enhances heat dissipation from a heat source, and includes a sheet 2a provided with a plurality of bag-shaped protrusions 3a on at least one surface. The protruding portion 3a has an opening 4a on the sheet 2a side. The heat dissipation structure 1a 'is the same as the heat dissipation structure 1a except that the heat dissipation structure 1a' does not include the elastic member 5a in the protrusion 3a of the heat dissipation structure 1a according to the second embodiment. When the heat dissipation structure 1a 'is compressed in its thickness direction, the air in the protrusion 3a serves as a cushion. Therefore, even if the elastic member 5a is not provided in the protruding portion 3a, a heat radiation function equivalent to that of the heat radiation structure 1a can be exhibited. In addition, even if the elastic member 5 is removed from the projecting portion 3 of the heat dissipation structure 1 according to the first embodiment, the same operation and effect as the heat dissipation structure 1a 'can be exerted.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Portions common to the above-described embodiments are denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 6 shows a plan view of a heat dissipation structure according to the third embodiment. 7 is a cross-sectional view (7A) of the heat dissipation structure of FIG. 6 taken along the line CC (7A), a cross-sectional view of the heat dissipation structure taken along the line CC (7B) of Modification Example 1, and a heat treatment structure of Modification Example 2 of C2. A cross-sectional view (7C) taken along line -C and a cross-sectional view (7D) similar to each modification of Modification 3 of the heat dissipation structure are shown.

  The heat dissipation structure 1b according to the third embodiment includes a sheet 2a having a scale-like unevenness. As shown in FIG. 7 (7A), the cross section of the heat radiation structure 1b taken along the line CC has a form similar to the cross section taken along the line AA of the heat radiation structure 1a according to the second embodiment. The seat 2a includes a plurality of cylindrical protrusions 3a having a bottom. The elastic member 6b is in contact with the outside of the protrusion 3a, and is more flexible and deformable than the sheet 2a. More specifically, the elastic member 6b is an lining sheet that covers a part of the bag outer surface of the protrusion 3a. The elastic member 6b covers at least the outer surface of the protrusion 3a. The elastic member 6b includes an annular member that covers the outer surface of the protrusion 3a, a flange connected to the annular member and covering at least a part of one surface (the surface on the protrusion 3a side) of the sheet 2a, and an opposite of the flange. And a peripheral edge covering portion connected to the annular member on the side and covering the peripheral edge of the projecting top surface of the projecting portion 3a. The peripheral covering portion does not completely cover the top T of the protrusion 3a. When a part of the top T is exposed, as shown by the line H in FIG. 7 (7A), the surface of the sheet 2a opposite to the protrusion 3a and a part of the top T are cooled with the surface on the heat source side. This makes it easier to make contact with the surface on the member side. Therefore, the heat radiation characteristics of the heat radiation structure 1b can be further improved.

  The elastic member 6b of the heat radiating structure 1b is in contact with the outside of the protrusion 3a, and contributes to maintaining the shape of the protrusion 3a and maintaining elasticity when the heat radiating structure 1b is compressed in the thickness direction. As a result, when the heat radiation structure 1b is compressed in the thickness direction, the elastic member 6b has a function of easily bringing the heat radiation structure 1b into close contact with the surface in contact with the heat source and / or the surface on the cooling member side. .

  FIG. 7 (7B) shows a cross section taken along line CC of heat dissipation structure 1c according to Modification 1 of the third embodiment. The sheet 2a of the heat dissipation structure 1c is the same as the sheet 2a of the heat dissipation structure 1b according to the third embodiment. The elastic member 6c is in contact with the inside of the protrusion 3a, and is more flexible and deformable than the sheet 2a. More specifically, the elastic member 6c is a lining sheet that covers the inner surface of the bag of the protrusion 3a. The elastic member 6c covers at least the inner surface of the protrusion 3a. The elastic member 6c is a cup-shaped member including an annular member that covers the inner surface of the protrusion 3a and a bottom surface that is connected to the annular member and covers the inner bottom surface of the protrusion 3a. Since the top T is completely exposed, the surface of the sheet 2a opposite to the protrusion 3a and a part of the top T can be easily brought into contact with the surface on the heat source side and the surface on the cooling member side. Therefore, the heat radiation characteristics of the heat radiation structure 1c can be further improved.

  FIG. 7 (7C) shows a cross section taken along line CC of heat dissipation structure 1d according to Modification 2 of the third embodiment. As shown in FIG. 7C, the cross section of the heat dissipation structure 1d taken along the line CC has a form similar to the cross section taken along the line AA of the heat dissipation structure 1a according to the second embodiment. The seat 2a includes a plurality of cylindrical protrusions 3a having a bottom. The elastic member 6d is in contact with the outside of the protrusion 3a and is more flexible and deformable than the sheet 2a. More specifically, the elastic member 6d is a lining sheet that covers a part of the bag outer surface of the protrusion 3a. The elastic member 6d covers at least the outer surface of the protrusion 3a. The elastic member 6d includes an annular member that covers the outer surface of the protrusion 3a, and a flange that is connected to the annular member and that has a flange that covers at least a portion of one surface (the surface on the protrusion 3a side) of the sheet 2a. It is a shaped member. The elastic member 6d does not cover the top T of the protrusion 3a. When the top T is exposed in this manner, the surface of the sheet 2a opposite to the protrusion 3a and the top T can be easily brought into contact with the surface on the heat source side and the surface on the cooling member side, respectively. Therefore, the heat radiation characteristics of the heat radiation structure 1d can be further improved.

  FIG. 7 (7D) shows a cross section of a heat dissipation structure 1e according to Modification 3 of the third embodiment. The heat radiation structure 1e includes a plurality of protrusions 3a on both surfaces of the sheet 2e. This is apparent from the fact that, as shown in FIG. 7 (7D), the protrusions 3a are present on both sides in the vertical direction in the figure with reference to the position L of the substantially flat surface of the sheet 2e. The elastic member 6b is a member having a crank-shaped cross section, like the elastic member 6b of the heat radiation structure 1b. The elastic member 6b provided in the heat radiation structure 1e includes an annular member that covers the outer surface of the protrusion 3a, and a flange that is connected to the annular member and covers at least a part of one surface (the surface on the protrusion 3a side) of the sheet 2e. And a peripheral edge covering portion connected to the annular member on the opposite side of the flange portion and covering the peripheral edge of the projecting top surface of the projecting portion 3a. The elastic member 6b does not completely cover the top T of the protrusion 3a. When a part of the top T is exposed in this manner, the surface of the sheet 2e opposite to the protrusion 3a and the top T are easily brought into contact with the surface on the heat source side and the surface on the cooling member side, respectively. Thus, the heat radiation characteristics of the heat radiation structure 1e can be further improved.

  The elastic members 6b, 6c, 6d are preferably rubber molded bodies having a smaller thickness than the sheets 2a, 2e. The elastic members 6b, 6c, 6d can be fitted outside or inside the protrusion 3a. Further, the elastic members 6b, 6c, 6d may be formed by applying a paint or printing using ink. In that case, the elastic members 6b, 6c, 6d can be called a coating layer or a printing layer. The printing layer can be formed by various printing methods such as pad printing, transfer printing, and inkjet printing. Further, the elastic members 6b, 6c, 6d may be referred to as reinforcing members (or reinforcing layers) that exhibit a reinforcing function against repeated bending of the sheets 2a, 2e.

  The sheets 2, 2a and 2e are formed by, for example, press molding using a mold, air pressure molding, vacuum molding, air pressure vacuum molding, or sand blasting in which fine particles collide with a flat sheet surface to partially form a concave portion. It can be manufactured by a manufacturing method or the like. The elastic members 6b, 6c, 6d may be layers that cover the entire surface of one or both surfaces of the sheets 2a, 2e. However, in this case, there are portions where the sheets 2a and 2e do not directly contact the surface on the heat source side and / or the surface on the cooling member side. For this reason, the elastic members 6b, 6c, and 6d are made thinner than the thickness of the sheets 2a and 2e (for example, 10% or less of the thickness of the sheets 2a and 2e), and / or have excellent thermal conductivity such as AlN. It is preferable to use a member in which a filler is dispersed. Also, the surfaces of the protruding portions 3 and 3a of the sheets 2, 2a and 2e are subjected to sandblasting or scratching so that the protruding portions 3 and 3a can easily adhere to the surface on the heat source side and / or the surface on the cooling member side. Is also good. In addition, examples of a method of integrally forming the elastic members 6b, 6c, and 6d on the sheets 2a and 2e include press molding using a die, air pressure molding, vacuum molding, air pressure vacuum molding, and injection molding.

2. Battery Next, a battery including the heat dissipation structure described above will be described.

(1st Embodiment)
FIG. 8 shows a longitudinal sectional view (8A) of a state where the battery according to the first embodiment is assembled, and a longitudinal sectional view (8B) of a state after the battery is assembled.

  In this embodiment, the battery 20 is, for example, a battery for an electric vehicle, and includes a large number of battery cells 10. The battery 20 includes a bottomed housing 21 that opens on one side. The housing 21 is preferably made of aluminum or an aluminum-based alloy. The battery cell 10 is an example of the above-described heat source, and is disposed inside the housing 21. The battery cell 10 may have a form in which the outside is surrounded by a hard resin or metal container, or a form in which a metal film is laminated with a resin film, that is, a so-called pouch bag. Above the battery cell 10, an electrode is provided to protrude. The plurality of battery cells 10 are preferably provided with a force in the direction of compression using screws or the like from both sides in the housing 21 so as to be in close contact with each other (not shown). One or a plurality of water cooling pipes 26 are provided on the bottom portion 22 of the housing 21 for flowing cooling water, which is an example of the cooling member 25. The battery cell 10 is arranged in the housing 21 so as to sandwich the heat dissipation structure 1 between the battery cell 10 and the bottom 22.

  The battery 20 includes one or more battery cells 10 as a heat source in a housing 21 having a structure in which a cooling member 25 flows. The heat dissipation structure 1 is interposed between the battery cell 10 and the cooling member 25. In this embodiment, the heat radiation structure 1 is preferably arranged such that the protruding portion 3 faces the battery cell 10 and the opening 4 opposite to the protruding portion 3 faces the cooling member 25 side. In the battery 20 having such a structure, the battery cells 10 transfer heat to the housing 21 through the heat dissipation structure 1 and are effectively removed by water cooling. Note that the cooling member 25 is not limited to the cooling water, but is interpreted to include an organic solvent such as liquid nitrogen and ethanol. The cooling member 25 is not limited to a liquid under a condition used for cooling, and may be a gas or a solid. Further, the heat dissipation structure 1 may be arranged such that the protruding portion 3 faces the cooling member 25 and the opening 4 opposite to the protruding portion 3 faces the battery cell 10 side.

  When the battery cell 10 is set in the housing 21 (see 8B), the heat dissipation structure 1 is disposed between the battery cell 10 and the bottom 22 having the water cooling pipe 26 in the thickness direction of the heat dissipation structure 1. (See 8B). As a result of the sheet 2 being in a form in which the protruding portion 3 is crushed, heat from the battery cell 10 is easily transmitted to the sheet 2, the bottom 22, the water cooling pipe 26, and the cooling member 25. The elastic member 5 contributes to making the battery cells 10 easily contact the sheet 2 even when there is a step between the battery cells 10.

(2nd Embodiment)
FIG. 9 shows a longitudinal sectional view (9A) of a situation where the battery according to the second embodiment is assembled, and a longitudinal sectional view (9B) of a state after the battery is assembled.

  When the battery cell 10 is set in the housing 21 (see 9B), the heat dissipation structure 1a is disposed between the battery cell 10 and the bottom 22 having the water cooling pipe 26 in the thickness direction of the heat dissipation structure 1a. (See 9B). As a result of the sheet 2a being in a form in which the protruding portion 3a is crushed, heat from the battery cell 10 is easily transmitted to the sheet 2a, the bottom 22, the water cooling pipe 26, and the cooling member 25. The elastic member 5a contributes to making the battery cells 10 easily contact the sheet 2a even when there is a step between the battery cells 10.

(Third embodiment)
FIG. 10 shows a longitudinal sectional view (10A) of a situation where the battery according to the third embodiment is assembled, and a longitudinal sectional view (10B) of a state after the battery is assembled.

  When the battery cell 10 is set in the housing 21 (see 10B), the heat dissipation structure 1b is disposed between the battery cell 10 and the bottom 22 having the water cooling pipe 26 in the thickness direction of the heat dissipation structure 1b. (See 10B). As a result of the sheet 2a being in a form in which the protruding portion 3a is crushed, heat from the battery cell 10 is easily transmitted to the sheet 2a, the bottom 22, the water cooling pipe 26, and the cooling member 25. The elastic member 6b contributes to making the battery cells 10 easily contact the sheet 2a even when there is a step between the battery cells 10.

(Fourth embodiment)
FIG. 11 shows a longitudinal sectional view (11A) of a situation in which a battery according to Modification 1 of the third embodiment is assembled (11A) and a longitudinal sectional view (11B) of a state after the battery is assembled.

  When the battery cell 10 is set in the housing 21 (see 11B), the heat dissipation structure 1c is disposed between the battery cell 10 and the bottom 22 having the water cooling pipe 26 in the thickness direction of the heat dissipation structure 1c. (See 11B). As a result of the sheet 2a being in a form in which the protruding portion 3a is crushed, heat from the battery cell 10 is easily transmitted to the sheet 2a, the bottom 22, the water cooling pipe 26, and the cooling member 25. The elastic member 6c contributes to making the battery cells 10 easily contact the sheet 2a even when there is a step between the battery cells 10.

  Although not shown, the battery 20 including the heat radiation structures 1d and 1e is in the same state as the fourth embodiment. Further, the battery 20 including the heat dissipation structure 1a 'is in the same state as the fourth embodiment, except that it does not include the elastic member.

3. Other Embodiments As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited thereto, and can be implemented with various modifications.

  For example, the heat source includes not only the battery cell 10 but also all objects that generate heat, such as a circuit board and an electronic device body. For example, the heat source may be an electronic component such as a capacitor and an IC chip. Similarly, the cooling member 25 may be not only water for cooling but also an organic solvent, liquid nitrogen, or a gas for cooling. Further, the heat dissipation structures 1, 1a, 1a ', 1b, 1c, 1d, 1e (referred to as heat dissipation structures 1 and the like) are arranged in structures other than the battery 20, for example, electronic devices, home appliances, power generation devices, and the like. May be.

  The interior of the projections 3, 3a preferably has a larger volume than the volume of the elastic members 5, 5a. For this reason, the protruding portions 3 and 3a are easily crushed when subjected to compression in the thickness direction of the heat dissipation structure 1 or the like. However, when the elastic members 5 and 5a are made of a material that is extremely easily compressed, the protrusions 3 and 3a are completely occupied by the elastic members 5 and 5a and do not need to contain air. .

  Elastic members 5 and 5a provided on the heat radiation structures 1 and 1a may be provided in one or more of the protrusions 3a of the heat radiation structures 1b, 1c, 1d and 1e. In the third embodiment and its modified examples 1, 2, and 3, the elastic member 6b is provided on one or more protruding portions 3a, the elastic member 6c is provided on another one or more protruding portions 3a, and the elastic member 6c is provided on the remaining protruding portions 3a. A member 6d may be provided. Thus, instead of providing the same elastic member for all the protrusions 3 and 3a of the heat dissipation structure 1 and the like, the elastic members may be changed by the protrusions 3 and 3a. The elastic members 5, 5a, 6b, 6c, 6d may be provided inside and outside the protrusions 3, 3a in some cases. The protrusions 3 and 3a may be provided on both surfaces of the sheets 2 and 2a as in the heat radiation structure 1e, regardless of the form.

  The sheets 2, 2a do not necessarily need to have the openings 4, 4a. That is, the protrusions 3 and 3a may be provided with a completely closed space. In addition, the openings 4, 4a may be provided not at the connection portion between the seats 2, 2a and the protrusions 3, 3a but at another portion of the protrusions 3, 3a.

  Note that a plurality of components of each of the above-described embodiments can be freely combined except in a case where they cannot be combined with each other.

  The heat dissipation structure according to the present invention can be used, for example, in various electronic devices such as automobiles, industrial robots, power generators, PCs, and household appliances, in addition to automobile batteries. Further, the battery according to the present invention can be used as a battery for home use and a battery for electronic devices such as a PC, in addition to a battery for an automobile.

1, 1a, 1a ', 1b, 1c, 1d, 1e: heat dissipating structure, 2, 2a, 2e: sheet, 3, 3a: protruding portion, 4, 4a: opening, 5 , 5a: elastic member, 6b, 6d: elastic member (outer lining sheet), 6c: elastic member (lining sheet), 10: battery cell (an example of heat source), 20: battery , 21 ... housing, 25 ... cooling member, T ... top top (outside top surface).

Claims (8)

A heat dissipation structure that enhances heat dissipation from a heat source,
A heat dissipation structure comprising a sheet provided with a plurality of bag-shaped protrusions on at least one surface. An elastic member that is in contact with the inside and / or the outside of the protruding portion and is more flexible and deformable than the sheet;
The heat dissipation structure according to claim 1, wherein the elastic member is in contact with the protrusion so as to expose at least a part of an outer top surface of the protrusion.   The heat dissipation structure according to claim 2, wherein the elastic member is disposed in a bag of the protrusion. The sheet includes an opening of the protrusion,
The heat dissipation structure according to claim 3, wherein the opening is formed in the sheet with a size that does not allow the elastic member to pass through.   The heat dissipation structure according to claim 3, wherein the elastic member is a lining sheet that covers an inner surface of the bag of the protrusion.   The heat dissipation structure according to claim 2, wherein the elastic member is a lining sheet that covers a part of an outer surface of the bag of the protrusion. A battery provided with battery cells as one or more heat sources in a housing having a structure for flowing a cooling member,
A battery comprising the heat radiating structure according to any one of claims 1 to 6, wherein the heat radiating structure is interposed between the battery cell and the cooling member. 8. The battery according to claim 7, wherein the heat dissipation structure is arranged with the protruding portion facing the battery cell and the opposite side of the protruding portion facing the cooling member side.