JP2017168225A - Heating/heat dissipation sheet and heating/heat dissipation system - Google Patents

Abstract

A heating heat dissipation sheet and a heating heat dissipation system that have both heating and heat dissipation functions and can be suitably used to maintain the temperature of a heating element within a predetermined range.
SOLUTION: A heat dissipation layer 11 having a graphite sheet, an electrode 12 formed on the heat dissipation layer 11 and capable of heating the heat dissipation layer 11 by energization, and an adhesive layer 13 laminated on the heat dissipation layer 11 are provided. A heating heat dissipation sheet 10 is provided.
[Selection] Figure 1

Description

  The present invention relates to a heat radiating sheet and a heat radiating system.

  Electric devices such as lithium ion batteries and motors generate heat due to Joule heat. However, in cold regions such as below freezing, there is a risk that operation may be hindered due to a decrease in battery reactivity or freezing. For this reason, providing the heater for a heating to a battery is proposed (refer patent documents 1-5).

JP 2011-165390 A JP 2011-165391 A Japanese Patent No. 4925680 Japanese Patent No. 5105809 Japanese Patent No. 4948187

  For example, a lithium ion battery is efficiently charged and discharged in a temperature range of 10 to 45 ° C., and the performance deteriorates at lower and higher temperatures. Since the electrical device itself is a heating element, conventionally, a large facility such as a blower fan is required to improve the operation at high temperature. However, when an electric device is used at a low temperature, even if the temperature is maintained by the heat generated by the electric device itself during operation, it is necessary to heat the electric device to start the operation efficiently when starting the operation. is there. Therefore, in order to use an electric device in a wide range of temperatures from low temperature to high temperature, it is desired to develop a material that is small and has the conflicting functions of heating (heating) and heat dissipation (cooling).

  In paragraph 0035 of Patent Document 3, it is described that a heat-generating component such as a diode is fixed to a metal chassis provided on the inner surface of the outer case and used together with a heat dissipation plate of the heat-generating component. However, in the invention described as one embodiment of Patent Document 3, the seat heater is disposed on the upper and lower surfaces (lead plate installation surfaces) of the inner case, and the metal chassis disposed on both side surfaces of the inner case; Are in different positions.

  Patent Document 3 also discloses a configuration in which the metal chassis covers the side surface and the upper and lower surfaces of the inner case as another embodiment. In that case, in order to prevent heat conduction from the heater to the metal chassis, it is described that the heater is not directly in contact with the metal chassis (paragraphs 0048 to 0049 of Patent Document 3).

  The present invention has been made in view of the above circumstances, has a heating and heat dissipation function, and can be suitably used for maintaining the temperature of the heating element within a predetermined range and heating. It is an object to provide a heat dissipation system.

In order to solve the above problems, the present invention provides a heat dissipation layer having a graphite sheet, an electrode formed on the heat dissipation layer and capable of heating the heat dissipation layer by energization, and an adhesive laminated on the heat dissipation layer. There is provided a heat radiating sheet comprising an agent layer.
The pressure-sensitive adhesive layer preferably has a thickness of 1 to 15 μm.
The pressure-sensitive adhesive layer is preferably made of a silicone pressure-sensitive adhesive.

In addition, the present invention provides a heating / dissipating system, wherein the heating / dissipating sheet is attached to a heating element by the adhesive layer.
It is preferable that a heat-dissipating layer having a graphite sheet is attached to a portion of the heating element different from the portion to which the heat-dissipating sheet is attached via an adhesive layer.
It is preferable that the heating element is flat and the heating and heat dissipation sheet is attached to at least one of the both surfaces.
It is preferable that the heating element has a cylindrical shape, and the heating heat dissipation sheet is attached so as to cover the curved surface portion.

The heating element is preferably a battery.
It is preferable that the battery is packaged by an exterior body made of a laminate including at least a resin base material layer, a barrier layer, and a sealant layer.
The heating element is preferably a motor.

  According to the present invention, by using a graphite sheet having appropriate thermal conductivity and electrical conductivity as a heat radiating material, the graphite sheet can be made to function as a heating body by energizing the graphite sheet from the outside.

It is a perspective view which shows Example 1 of the heat radiation sheet of this invention. It is sectional drawing which shows Example 2 of the heating thermal radiation sheet | seat of this invention. It is sectional drawing which shows Example 1 of the heating thermal radiation system of this invention. It is sectional drawing which shows Example 2 of the heating thermal radiation system of this invention. It is sectional drawing which shows Example 3 of the heating thermal radiation system of this invention. It is sectional drawing which shows Example 3 of the heat radiation sheet of this invention. It is sectional drawing which shows Example 4 of the heating thermal radiation system of this invention.

  Hereinafter, based on a preferred embodiment, the present invention will be described with reference to the drawings.

  In FIG. 1, Example 1 of the heat radiation sheet of this invention is shown. The heating heat dissipation sheet 10 includes a heat dissipation layer 11 having a graphite sheet, an electrode 12 formed on the heat dissipation layer 11, and an adhesive layer 13 laminated on the heat dissipation layer 11.

  The heat dissipation layer 11 is made of a graphite sheet or a material (laminated body or the like) including the graphite sheet as a material having electrical conductivity and moderate thermal conductivity. As the graphite sheet, either natural graphite or synthetic graphite can be used. The thickness of the graphite sheet is preferably about 10 to 1000 μm per monolayer, for example. Two or more layers or two or more types of graphite sheets may be laminated with an adhesive or the like. Natural graphite is inexpensive, and synthetic graphite has few impurities and is excellent in physical properties. Therefore, it is preferable to select natural graphite in consideration of applications and performance.

As the characteristics of the graphite sheet, for example, the electric conductivity in the planar direction is 5000 to 25000 S / cm (specific resistance is 4 × 10 ⁻⁵ to 2 × 10 ⁻⁴ Ω · cm), and the thermal conductivity in the planar direction is 100 to 100. Examples thereof include 3000 W / (m · K) and a thermal conductivity in the thickness direction of 1 to 30 W / (m · K). The graphite sheet is a crystalline material having a layered structure as a whole, and has a crystal axis (c-axis) in which monoatomic layers are stacked in the thickness direction, so that its physical properties are large in the thickness direction and the planar direction. Shows anisotropy.

  The electrode 12 can receive heat from the outside, thereby energizing the heat dissipation layer 11 to generate heat and heat the heat dissipation layer 11. Although the installation location of the electrode 12 is not particularly limited, it may be a plurality of locations on the surface of the heat dissipation layer 11. For example, it is preferable to provide the electrodes 12 in pairs on opposite sides. The formation material and method of the electrode 12 are not particularly limited, and examples thereof include adhesion of a metal foil piece and printing of a conductive paste.

  The pressure-sensitive adhesive layer 13 is used for adhering the heat radiating sheet 10 to an adherend such as a heating element. Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 13 include a silicone pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, and a urethane pressure-sensitive adhesive. The usable temperature range (cold resistance and heat resistance), chemical resistance From the viewpoints of properties and water resistance, a silicone pressure-sensitive adhesive is preferred. As thickness of an adhesive layer, 1-15 micrometers is mentioned, for example. If the pressure-sensitive adhesive layer 13 is too thin, the adhesive force will be low, and if the pressure-sensitive adhesive layer 13 is too thick, the thermal conductivity may be reduced.

  Since the graphite sheet has appropriate thermal conductivity and electrical conductivity, it can serve as both a heat dissipation layer and a heat generation layer due to electrical resistance. Since the thermal conductivity in the thickness direction is lower than that in the plane direction, even when heat is generated by energization, the amount of heat leaking to the outside is small and efficient heating is possible. When heat radiation is required, the heat conductivity in the planar direction is excellent, so that the heat of the heating element can be dispersed in the surface and efficiently radiated (cooled).

  FIG. 2 shows Example 2 of the heat dissipation sheet of the present invention. In the present embodiment, a protective sheet 16 for protecting the heat radiation layer 11 and the electrode 12 is laminated on the heating heat radiation sheet 10 of the first embodiment. Examples of the protective sheet 16 include a laminate in which the protective layer 15 can be attached to the heat dissipation layer 11 and the electrode 12 via the adhesive layer 14. By laminating the protective sheet 16 on the heat radiation layer 11 and the electrode 12 of the heat radiation sheet 10, damage to the graphite sheet and the electrode, and graphite stains, powder, and the like can be suppressed.

  Examples of the adhesive layer 14 include a curable adhesive such as a phenol resin in addition to a pressure sensitive adhesive such as a silicone pressure sensitive adhesive. Examples of the protective layer 15 include polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, and resin films such as nylon (polyamide resin) and polyimide.

  A release sheet 17 can be provided on the adhesive surface of the adhesive layer 13 of the heat radiating sheet 10. In the state where the release sheet 17 is adhered to the adhesive surface, the adhesive layer 13 can be protected during the transportation and storage of the heat-dissipating sheet 10. When sticking the heat-dissipating sheet 10 to the heating element, the release sheet 17 can be easily peeled off from the pressure-sensitive adhesive layer 13 with a light force. Although the structure of the peeling sheet 17 is not specifically limited, The laminated body which has peeling agents, such as a silicone resin and a fluororesin, on the surface of base materials, such as a resin film and paper, is mentioned.

  A heating / dissipating system can be configured by sticking the heating / dissipating sheet 10 to a heating element using the adhesive layer 13. Examples of the heating element include an electric device such as a lithium ion battery, a fuel cell, a secondary battery, a motor, and a display device. When the heating element is flat, the heat dissipation sheet 10 can be attached to at least one surface of both surfaces of the heating element.

  When the heating element is a battery such as a lithium ion battery, the heating element is preferably packaged by an exterior body composed of a laminate including at least a resin base material layer, a barrier layer, and a sealant layer. Thereby, it is lightweight, ensures durability over a wide range of temperatures, and facilitates sticking with the pressure-sensitive adhesive layer 13.

  Examples of the resin substrate layer include polyester resins such as polyethylene terephthalate, polyolefin resins such as polypropylene, nylon (polyamide resin), and resin films such as polyimide. Examples of the gas barrier layer include metal foil such as stainless steel and aluminum foil. Examples of the sealant layer include polyolefin resins such as polyethylene and polypropylene, particularly acid-modified polyolefin resins such as maleic anhydride.

  FIG. 3 shows a first embodiment of the heating and radiating system of the present invention. This heating / dissipating system has a configuration in which the heating / dissipating sheet 10 of Example 1 is attached to one side of a heating element 21 such as a battery, and the releasing sheet 20 is attached to the opposite side of the heating element 21. Examples of the heat dissipation sheet 20 include a configuration in which the electrode 12 is omitted from the heat dissipation sheet 10 and the pressure-sensitive adhesive layer 13 is provided on one side or both sides of the heat dissipation layer 11.

  Furthermore, when the heat radiating sheet 20 is attached to a surface different from the surface to which the heat radiating sheet 10 is attached, the heat radiating layer 11 having a graphite sheet is laminated on the heating element 21 via the adhesive layer 13. Thereby, compared with the case where the thermal radiation sheet 20 is abbreviate | omitted, the thermal radiation amount (heat transfer amount at the time of thermal radiation) can be increased.

  FIG. 4 shows a second embodiment of the heating and radiating system of the present invention. The heating / dissipating sheet 10 attached to one side of the heating element 21 is the same as the heating / dissipating system of the first embodiment. In the heating and radiating system of Example 2, the radiating sheet 20 attached to the heating element 21 has the radiating layer 11 longer than the adhesive layer 13, and the portion of the radiating layer 11 where the adhesive layer 13 is laminated. On the outside, a communication part 22 for conducting heat to the cooling device 23 is provided. Examples of the cooling device 23 include an air cooling box, a heat exchanger, and a metal radiator.

  According to the present embodiment, in addition to the effect of the heating and heat dissipation system of the first embodiment, the connecting portion 22 includes the graphite sheet continuous from the heat dissipation layer 11, so that the thermal conductivity in the planar direction is excellent. For this reason, even when there is much heat generation from the heating element 21, excess heat can be conducted to the cooling device 23 to improve the heat dissipation capability.

  FIG. 5 shows a third embodiment of the heating and radiating system of the present invention. In the present embodiment, the heat radiating unit 31 adhered to one surface of the heating element 21, the heat radiating unit 32 adhered to the opposite surface of the heating element 21, and the communication unit 22 for conducting heat to the cooling device 23. Constitutes an integral heating and heat dissipation sheet 30.

  The heat radiating portion 31 has the same configuration as that of the heat radiating sheet 10 in FIG. 4, and the heat radiating portion 32 has the same configuration as that of the heat radiating sheet 20 in FIG. 4. The pressure-sensitive adhesive layer 13 can be integrally formed across the heat radiating portion 31 and the heat radiating portion 32. Further, the heat radiation layer 11 can include a graphite sheet that continues from the heat radiation part 31 to the communication part 22 via the heat radiation part 32.

  According to the present embodiment, in addition to the effects of the heating and radiating system of Embodiments 1 and 2, the heating and radiating sheet 30 has flexibility, so that it can be bent so as to wrap around the heating element 21. Not only can the heat-dissipating sheet and the heat-dissipating sheet be combined into one sheet, but also when the heating element 21 is heated by the heating-dissipating part 31, heat is transferred from the heating-dissipating part 31 side to the heat-dissipating part 32 side. The heat generating element 21 can be heated from both sides by being dispersed.

  FIG. 6 shows Example 3 of the heat-dissipating sheet of the present invention. In this heating and heat-dissipating sheet, a protective sheet 16 similar to that in FIG. 2 is attached to one side of the heat-dissipating layer 11 provided with the electrode 12 on one side, and a double-sided adhesive sheet 40 is attached to the opposite surface of the heat-dissipating layer 11 This is the configuration. The double-sided pressure-sensitive adhesive sheet 40 has pressure-sensitive adhesive layers 42 and 43 on both sides of the base material sheet 41. The substrate sheet 41 may be a resin film, but may be a metal foil or the like having excellent thermal conductivity.

FIG. 7 shows a fourth embodiment of the heating and radiating system of the present invention. In the present embodiment, the heat-dissipating sheet 10 is attached so as to cover the curved surface portion (circumferential side surface portion) of the cylindrical heating element 24, and the electrode 12 is positioned so as to be perpendicular to the circle on the bottom surface of the cylinder. It is a configuration. The position of the electrode 12 is not particularly limited, but in the length direction of the heat radiating sheet 10 along the circumferential direction of the cylindrical heating element 24, two or more locations selected from one end, the middle, the other end, and the like are present. preferable. In FIG. 7, the example which provided the electrode 12 in two places (one end part and intermediate part) of the heat dissipation sheet 10 was shown.
The heating element 24 is the same as the flat heating element 21 except for its shape, and can be applied to batteries, motors, and the like. The shape of the heating element 24 may be a columnar body such as a polygonal column, a cylindrical body such as a cylinder, etc. in addition to a columnar shape.

  As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  The heating and radiating system of the present invention may include a temperature sensor that measures the temperature of the heating element, and a controller that switches between an energized state and an unenergized state with respect to the electrodes of the heating and radiating sheet based on the measured temperature.

DESCRIPTION OF SYMBOLS 10 ... Heat radiation sheet, 11 ... Heat radiation layer, 12 ... Electrode, 13 ... Adhesive layer, 20 ... Heat radiation sheet, 21, 24 ... Heat generating body, 30 ... Heat radiation sheet, 31 ... Heat radiation part, 32 ... Heat radiation part.

Claims (10)

  Heating comprising: a heat dissipation layer having a graphite sheet; an electrode formed on the heat dissipation layer and capable of heating the heat dissipation layer by energization; and an adhesive layer laminated on the heat dissipation layer. Heat dissipation sheet.   The heat-dissipating sheet according to claim 1, wherein the pressure-sensitive adhesive layer has a thickness of 1 to 15 μm.   The heat-dissipating sheet according to claim 1 or 2, wherein the pressure-sensitive adhesive layer comprises a silicone pressure-sensitive adhesive.   A heating / dissipating system, wherein the heating / dissipating sheet according to any one of claims 1 to 3 is adhered to a heating element by the pressure-sensitive adhesive layer.   5. The heating according to claim 4, wherein a heat dissipation layer having a graphite sheet is attached to a portion of the heating element different from the portion to which the heating heat dissipation sheet is attached via an adhesive layer. Heat dissipation system.   The heating and radiating system according to claim 4 or 5, wherein the heating element is flat and the heating and radiating sheet is adhered to at least one of the two surfaces.   The heating / dissipating system according to claim 4 or 5, wherein the heating element has a cylindrical shape, and the heating / dissipating sheet is attached so as to cover a curved surface portion thereof.   The heating and radiating system according to any one of claims 4 to 7, wherein the heating element is a battery.   The heating / dissipating system according to claim 8, wherein the battery is packaged by an exterior body made of a laminate including at least a resin base material layer, a barrier layer, and a sealant layer.   The heating and radiating system according to any one of claims 4 to 7, wherein the heating element is a motor.

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