Heat absorber

Abstract

The utility model relates to a heat absorber. Provided is a technique capable of efficiently absorbing heat from a heat source. A heat-absorbing body for absorbing heat from a heat-generating source is provided with: a first heat-conducting part attached to the surface of the heat-generating source, the first heat-conducting part being formed from a phase-change material having a first heat conductivity and a first latent heat; and a second heat conduction part attached to the surface of the first heat conduction part on the opposite side from the heat generation source, the second heat conduction part being formed of a phase change material having a second heat conductivity lower than the first heat conductivity and a second latent heat greater than the first latent heat.

Description

TECHNICAL FIELD

[0001] The technology disclosed in this specification relates to a heat-absorbing body. BACKGROUND

[0002] A solid heat storage material having adjusted thermal conductivity is disclosed in Patent Literature 1, which is formed of a joint body of vanadium dioxide and a high-thermal-conductivity substance, and is capable of adjusting heat dissipation and heat storage in a wide range.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: International Publication No. 2021 / 230357 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] The solid heat storage material of Patent Literature 1 is sometimes used to absorb heat of a heat generating source (for example, an electronic device). However, in the solid heat storage material of Patent Literature 1, although the thermal conductivity is adjusted, since the thermal conductivity and latent heat of the solid heat storage material are in a trade-off relationship, it is difficult to balance heat dissipation and heat storage. Therefore, simply applying the solid heat storage material of Patent Literature 1 to a heat generating source does not efficiently absorb heat of the heat generating source. The present specification provides technology capable of efficiently absorbing heat of a heat generating source.

[0008] SOLUTION TO THE PROBLEM

[0009] In the first technical solution of the present technology, it can also be a heat-absorbing body that absorbs heat of a heat generating source, characterized in that the heat-absorbing body comprises: a first heat conducting portion mounted to a surface of the heat generating source, the first heat conducting portion being formed of a phase change material having a first thermal conductivity and a first latent heat; and a second heat conducting portion mounted to a surface of the first heat conducting portion on the side opposite to the heat generating source, the second heat conducting portion being formed of a phase change material having a second thermal conductivity lower than the first thermal conductivity and a second latent heat greater than the first latent heat.

[0010] According to this structure, the heat of the heat generating source can be rapidly conducted to the second heat conducting portion through the first heat conducting portion having a relatively high thermal conductivity. In addition, the heat of the heat generating source can be more absorbed through the second heat conducting portion having a relatively large latent heat. Thus, the heat of the heat generating source can be efficiently absorbed.

[0011] In the second technical solution, according to the first technical solution described above, in the direction in which the first heat conducting portion and the second heat conducting portion are arranged, the thickness of the first heat conducting portion is thicker than the thickness of the second heat conducting portion.

[0012] According to this structure, by making the first heat conducting portion thick, the heat of the heat generating source can be rapidly absorbed, and the temperature of the heat generating source can be maintained low.

[0013] In the third technical solution, according to the first or second technical solution, the heat absorbing body can further include a third heat conducting portion installed on a surface of the second heat conducting portion opposite to the first heat conducting portion, the third heat conducting portion being formed of a phase change material having a third heat conductivity lower than the second heat conductivity and a third latent heat greater than the second latent heat.

[0014] According to this structure, by adjusting the thickness of each of the first, second, and third heat conducting portions, the heat absorbing degree of the heat absorbing body can be adjusted. That is, the degree of freedom of the heat absorbing degree can be improved. By adjusting the heat absorbing degree of the heat absorbing body, for example, the temperature of the heat generating source can be maintained low for a long time.

[0015] In the fourth technical solution, according to the first technical solution, the second heat conducting portion can have a thickness greater than that of the first heat conducting portion in a direction in which the first and second heat conducting portions are arranged.

[0016] According to this structure, by making the second heat conducting portion thick, the heat of the heat generating source can be more absorbed, and the temperature of the heat generating source can be maintained constant for a longer time.

[0017] In the fifth technical solution, according to any one of the first to fourth technical solutions, the heat generating source can be a secondary battery. According to this structure, the heat of the secondary battery can be efficiently absorbed. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a cross-sectional view of a heat absorbing body of an embodiment.

[0019] Figure 2 is a cross-sectional view of a heat absorbing body of a modified example (1).

[0020] Figure 3 is a cross-sectional view of a heat absorbing body of a modified example (2).

[0021] Figure 4 is a cross-sectional view of a heat absorbing body of a modified example (3).

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] 2, heat-absorbing body; 4, heat-generating source; 10, first heat-conducting portion; 12, surface; 20, second heat-conducting portion; 22, surface; 30, third heat-conducting portion; 42, surface; tl, first thickness; t2, second thickness; t3, third thickness. DETAILED DESCRIPTION

[0024] A heat-absorbing body of an embodiment is described with reference to the drawings. As shown in FIG. 1, a heat-absorbing body 2 of an embodiment is mounted to a heat-generating source 4. The heat-absorbing body 2 has a first heat-conducting portion 10 and a second heat-conducting portion 20. The first heat-conducting portion 10 is arranged on the side of the heat-generating source 4, and the second heat-conducting portion 20 is arranged on the side opposite to the heat-generating source 4. The heat-absorbing body 2 absorbs heat of the heat-generating source 4 through the first heat-conducting portion 10 and the second heat-conducting portion 20. Figure 1

[0025] The heat-generating source 4 is not particularly limited, and is, for example, a secondary battery mounted on an electric vehicle, an electronic device, or the like. The electric vehicle is, for example, an electric automobile, a hybrid automobile. The secondary battery is, for example, a lithium ion battery, a nickel-hydrogen battery. The secondary battery generates heat, for example, at the time of charging, at the time of discharging. The heat-absorbing body 2 is mounted, for example, to a surface of a case of the secondary battery, and absorbs heat of the secondary battery.

[0026] The first heat-conducting portion 10 is mounted to a surface 42 of the heat-generating source 4. For example, the first heat-conducting portion 10 is attached to the surface 42 of the heat-generating source 4 with an adhesive having heat conductivity. The first heat-conducting portion 10 has a first thickness tl in a direction in which the first heat-conducting portion 10 and the second heat-conducting portion 20 are arranged.

[0027] The first heat-conducting portion 10 has a first heat conductivity and a first latent heat. More specifically, the first heat-conducting portion 10 is made of a phase change material having the first heat conductivity and the first latent heat. For example, the first heat-conducting portion 10 is made of a solid by sintering a powder-like phase change material. The phase change material is also sometimes referred to as a heat storage material. The first heat conductivity of the first heat-conducting portion 10 is a higher heat conductivity than a second heat conductivity of the second heat-conducting portion 20 described later. In addition, the first latent heat of the first heat-conducting portion 10 is a smaller latent heat than a second latent heat of the second heat-conducting portion 20 described later. The phase change material of the first heat-conducting portion 10 requires heat of the first latent heat when undergoing a phase change (also referred to as a phase transformation). Therefore, the first heat-conducting portion 10 rises in temperature after absorbing the heat of the first latent heat at a phase change temperature.

[0028] ​For the phase change material of the first heat conducting portion 10, for example, vanadium dioxide is contained as a main component, and tungsten is contained as a subcomponent. Further, for the phase change material of the first heat conducting portion 10, for example, a high thermal conductivity substance such as copper or aluminum is contained as a subcomponent. The thermal conductivity of the phase change material of the first heat conducting portion 10 is adjusted, for example, by adjusting the amount of addition of the high thermal conductivity substance. The thermal conductivity of the phase change material becomes higher as the amount of addition of the high thermal conductivity substance becomes larger. On the other hand, the latent heat of the phase change material becomes smaller as the amount of addition of the high thermal conductivity substance becomes larger. The thermal conductivity and the latent heat of the phase change material are in a trade-off relationship. For example, the volume fraction of the high thermal conductivity substance in the phase change material of the first heat conducting portion 10 is 0.03 or more and less than 0.05.

[0029] The second heat conducting portion 20 is attached to the surface 12 (the surface on the side opposite to the heat generation source 4) of the first heat conducting portion 10. For example, the second heat conducting portion 20 is attached to the surface 12 of the first heat conducting portion 10 with an adhesive having thermal conductivity. The second heat conducting portion 20 has a second thickness t2 in the direction in which the first heat conducting portion 10 and the second heat conducting portion 20 are arranged. The second thickness t2 of the second heat conducting portion 20 is thinner than the first thickness t1 of the first heat conducting portion 10 (the first thickness t1 is thicker than the second thickness t2).

[0030] The second heat conducting portion 20 has a second thermal conductivity and a second latent heat. In more detail, the second heat conducting portion 20 is made of a phase change material having the second thermal conductivity and the second latent heat. For example, the second heat conducting portion 20 is made of a solid by sintering a powdered phase change material. The second thermal conductivity of the second heat conducting portion 20 is a thermal conductivity lower than the first thermal conductivity of the first heat conducting portion 10. Further, the second latent heat of the second heat conducting portion 20 is a latent heat larger than the first latent heat of the first heat conducting portion 10. The phase change material of the second heat conducting portion 20 requires heat of the second latent heat when undergoing a phase change. Therefore, the temperature of the second heat conducting portion 20 rises after absorbing the heat of the second latent heat at the phase change temperature.

[0031] For the phase change material of the second heat conducting portion 20, as with the first heat conducting portion 10, for example, vanadium dioxide is contained as a main component, and tungsten is contained as a subcomponent. Further, for the phase change material of the second heat conducting portion 20, for example, a high thermal conductivity substance such as copper or aluminum is contained as a subcomponent. The thermal conductivity of the phase change material of the second heat conducting portion 20 is adjusted, for example, by adjusting the amount of addition of the high thermal conductivity substance. The thermal conductivity becomes higher as the amount of addition of the high thermal conductivity substance becomes larger. On the other hand, the latent heat of the phase change material becomes smaller as the amount of addition of the high thermal conductivity substance becomes larger. The thermal conductivity and the latent heat of the phase change material are in a trade-off relationship. For example, the volume fraction of the high thermal conductivity substance in the phase change material of the second heat conducting portion 20 is 0.02 or more and less than 0.03.

[0032] In the heat absorber 2 with the above-described structure, heat from the heat source 4 is conducted to the first heat conduction section 10, and then the heat is conducted from the first heat conduction section 10 to the second heat conduction section 20. The heat conducted to the second heat conduction section 20 is dissipated to the outside.

[0033] (Effect)

[0034] The embodiments have been described above. As described above, the heat absorber 2 includes: a first heat conduction portion 10, which is mounted on the surface 42 of the heat source 4; and a second heat conduction portion 20, which is mounted on the surface 12 of the first heat conduction portion 10. The first heat conduction portion 10 is formed of a phase change material having a first thermal conductivity and a first latent heat, and the second heat conduction portion 20 is formed of a phase change material having a second thermal conductivity and a second latent heat. The first thermal conductivity is higher than the second thermal conductivity (the second thermal conductivity is lower than the first thermal conductivity). The second latent heat is greater than the first latent heat (the first latent heat is smaller than the second latent heat).

[0035] According to this structure, the heat from the heat source 4 can be rapidly conducted to the second heat conduction section 20 through the first heat conduction section 10, which has a relatively high thermal conductivity. Furthermore, the second heat conduction section 20, which has a relatively large latent heat, can absorb a greater amount of heat from the heat source 4. Therefore, the heat from the heat source 4 can be absorbed efficiently.

[0036] Furthermore, in the heat absorber 2, the first thickness t1 of the first heat conduction section 10 is thicker than the second thickness t2 of the second heat conduction section 20. According to this structure, by making the first heat conduction section 10 relatively thick, the heat from the heat source 4 can be absorbed quickly, and the temperature of the heat source 4 can be maintained at a low level.

[0037] (Modified Example)

[0038] (1) In the variant example, such as Figure 2 As shown, the heat absorber 2 may also include a third heat-conducting portion 30. The third heat-conducting portion 30 is mounted on the surface 22 of the second heat-conducting portion 20 (the side opposite to the heat source 4 and the first heat-conducting portion 10). For example, the third heat-conducting portion 30 is attached to the surface 22 of the second heat-conducting portion 20 using a thermally conductive adhesive. The third heat-conducting portion 30 has a third thickness t3 in the direction in which the second and third heat-conducting portions 20 are arranged. The third thickness t3 of the third heat-conducting portion 30 is thinner than the second thickness t2 of the second heat-conducting portion 20 (the second thickness t2 is thicker than the third thickness t3).

[0039] The third heat conducting portion 30 has a third heat conductivity and a third latent heat. In more detail, the third heat conducting portion 30 is made of a phase change material having the third heat conductivity and the third latent heat. For example, the third heat conducting portion 30 is made of a solid by sintering a powdered phase change material. The third heat conductivity of the third heat conducting portion 30 is a lower heat conductivity than the second heat conductivity of the second heat conducting portion 20. Further, the third latent heat of the third heat conducting portion 30 is a larger latent heat than the second latent heat of the second heat conducting portion 20. The phase change material of the third heat conducting portion 30 requires heat of the third latent heat when undergoing a phase change. Therefore, the third heat conducting portion 30 increases in temperature after absorbing the heat of the third latent heat at the phase change temperature.

[0040] For the phase change material of the third heat conducting portion 30, as with the first heat conducting portion 10 and the second heat conducting portion 20, for example, vanadium dioxide is included as a main component, and tungsten is included as a subcomponent. Further, for the phase change material of the third heat conducting portion 30, for example, a high heat conductivity substance such as copper, aluminum, or the like is included as a subcomponent. The phase change material of the third heat conducting portion 30 adjusts the heat conductivity, for example, by adjusting the amount of addition of the high heat conductivity substance. The more the amount of addition of the high heat conductivity substance, the higher the heat conductivity of the phase change material. On the other hand, the more the amount of addition of the high heat conductivity substance, the smaller the latent heat of the phase change material. The heat conductivity and the latent heat of the phase change material are in a trade-off relationship. For example, the volume fraction of the high heat conductivity substance in the phase change material of the third heat conducting portion 30 is 0.01 or more and less than 0.02.

[0041] (2) In other modified examples, as shown in FIG. 6, the first thickness t1 of the first heat conducting portion 10, the second thickness t2 of the second heat conducting portion 20, and the third thickness t3 of the third heat conducting portion 30 can be the same thickness in the direction in which the first heat conducting portion 10, the second heat conducting portion 20, and the third heat conducting portion 30 are arranged. The first thickness t1, the second thickness t2, and the third thickness t3 can be appropriately changed. Figure 3

[0042] According to this structure, by adjusting the first thickness t1, the second thickness t2, and the third thickness t3, the heat absorption degree of the heat absorber 2 can be adjusted. That is, the degree of freedom of the heat absorption degree can be increased. By adjusting the heat absorption degree, for example, the temperature of the heat generation source 4 can be maintained lower for a relatively long period of time.

[0043] (3) In other modified examples, as shown in FIG. 7, the first thickness t1 of the first heat conducting portion 10, the second thickness t2 of the second heat conducting portion 20, and the third thickness t3 of the third heat conducting portion 30 can be different thicknesses in the direction in which the first heat conducting portion 10, the second heat conducting portion 20, and the third heat conducting portion 30 are arranged. The first thickness t1, the second thickness t2, and the third thickness t3 can be appropriately changed. Figure 4 ​As shown, the second thickness t2 of the second heat conducting portion 20 can be thicker than the first thickness t1 of the first heat conducting portion 10 (or the first thickness t1 can be thinner than the second thickness t2) in the direction in which the first heat conducting portion 10 and the second heat conducting portion 20 are arranged. In addition, the third thickness t3 of the third heat conducting portion 30 can be thicker than the second thickness t2 of the second heat conducting portion 20 (or the second thickness t2 can be thinner than the third thickness t3) in the direction in which the second heat conducting portion 20 and the third heat conducting portion 30 are arranged.

[0044] According to this structure, by making the second heat conducting portion 20 and the third heat conducting portion 30 thicker, which have larger latent heat, the heat of the heat generating source 4 can be absorbed more, and the temperature of the heat generating source 4 can be maintained constant for a longer time.

[0045] The above detailed the specific examples of the present application, but these are merely examples and do not limit the claims. In the technology recited in the claims, technologies in which the above examples are variously transformed and changed are included. The technical elements described in the specification or drawings are useful in technology alone or in various combinations, and are not limited to the combinations recited in the claims at the time of filing. In addition, the technologies exemplified in the specification or drawings can simultaneously achieve multiple purposes, and achieving one of them itself has technical usefulness.

Claims

1. A heat-absorbing body that absorbs heat of a heat-generating source, characterized by comprising: a first heat-conducting portion that is attached to a surface of the heat-generating source, the first heat-conducting portion being formed of a phase-change material having a first heat conductivity and a first latent heat; and a second heat-conducting portion that is attached to a surface of the first heat-conducting portion on a side opposite to the heat-generating source, the second heat-conducting portion being formed of a phase-change material having a second heat conductivity lower than the first heat conductivity and a second latent heat greater than the first latent heat.

2. The heat-absorbing body according to claim 1, characterized in that a thickness of the first heat-conducting portion is greater than a thickness of the second heat-conducting portion in a direction in which the first heat-conducting portion and the second heat-conducting portion are arranged.

3. The heat-absorbing body according to claim 1 or 2, characterized by further comprising a third heat-conducting portion that is attached to a surface of the second heat-conducting portion on a side opposite to the first heat-conducting portion, the third heat-conducting portion being formed of a phase-change material having a third heat conductivity lower than the second heat conductivity and a third latent heat greater than the second latent heat.

4. The heat-absorbing body according to claim 1, characterized in that a thickness of the second heat-conducting portion is greater than a thickness of the first heat-conducting portion in a direction in which the first heat-conducting portion and the second heat-conducting portion are arranged.

5. The heat-absorbing body according to claim 1 or 2, characterized in that the heat-generating source is a secondary battery. ​ ​ ​ ​ ​ ​ ​ ​

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