Heat dissipation member and method for manufacturing heat dissipation member

Abstract

A heat dissipation member (100) comprises a laminate (100L) including a plurality of composite material layers having a fiber orientation. The laminate (100L): has a roll-like shape around which a plate-like body is wound; has at least two composite material layers having different fiber orientations; and has an arrangement of fiber orientations of the plurality of composite material layers arranged asymmetrically in the lamination direction. The laminate (100L) undergoes an autonomous change in shape from a roll shape, due to thermal expansion and thermal contraction accompanying a temperature change inside the heat dissipation member (100). As one example of the shape change, the roll-shaped laminate (100L) extends in a -Y direction from the roll shape.

Description

Heat dissipation member and method for manufacturing the same

[0001] The present disclosure relates to a heat dissipation member and a method for manufacturing the heat dissipation member.

[0002] Since satellites are in a vacuum environment in orbit, they use radiation to control heat. A balance is maintained between heat input from the sun and heat generated by onboard equipment, and heat dissipation from the satellite to the outside through radiation. Thermal control is often designed based on the time when the satellite is in the sun. In the shade, the amount of heat dissipation increases, so the temperature of onboard equipment is controlled by heater heating. With regard to heater heating, there is a need to reduce the power consumption of heater heating, increase the amount of power allocated to the satellite's onboard equipment, and improve the functionality of the satellite. Therefore, there is a need for technology to control the amount of heat dissipation according to the heat input from the sun.

[0003] For example, the thermal louver in Patent Document 1 is driven by a bimetal that bends in response to temperature changes. The thermal louver in Patent Document 1 exposes its heat-dissipating surface to radiate heat when the temperature is high, and exposes its insulating surface to control heat when the temperature is low. However, the mechanism of the thermal louver in Patent Document 1 is complex, and the use of a bimetal makes it heavy, which is a problem.

[0004] Japanese Unexamined Patent Publication No. 58-221416

[0005] An object of the present disclosure is to provide a heat dissipation member that has a simple mechanism and is lightweight.

[0006] The heat dissipation member of the present disclosure includes a laminate including a plurality of composite material layers having different fiber orientations, the laminate having a roll shape formed by winding a plate-like body, at least two composite material layers having different fiber orientations, the fiber orientations of the composite material layers being arranged asymmetrically in the stacking direction, and the laminate autonomously undergoing shape change from the roll shape due to thermal expansion and contraction caused by temperature changes.

[0007] The heat dissipation member of the present disclosure includes a laminate including multiple composite material layers, and autonomously changes shape from a rolled state due to thermal expansion and contraction caused by temperature changes in the heat dissipation member. Therefore, the heat dissipation member of the present disclosure can control the amount of heat dissipation depending on whether it is in sunlight or shade, and can provide a lightweight heat dissipation member.

[0008] FIG. 1 is a diagram of embodiment 1, showing a schematic diagram of the shape of the heat dissipation member 100 at low temperature. FIG. 2 is a diagram of embodiment 1, showing a schematic diagram of the shape of the heat dissipation member 100 at high temperature. FIG. 3 is a diagram of embodiment 1, showing a schematic diagram of the A-A cross section of the heat dissipation member 100. FIG. 4 is a diagram of embodiment 1, showing a difference in emissivity on the surface of the heat dissipation member 100. FIG. 5 is a diagram of embodiment 1, showing an outline of a manufacturing method for the heat dissipation member 100. FIG. 6 is a diagram of embodiment 2, showing a schematic diagram of the heat dissipation member 100 of embodiment 2 at high temperature. FIG. 7 is a diagram of embodiment 2, showing a schematic diagram of the B-B cross section of the heat dissipation member 100.

[0009] In the description of the embodiments and the drawings, the same elements and corresponding elements are denoted by the same reference numerals, and the description of the elements denoted by the same reference numerals will be omitted or simplified as appropriate.

[0010] Embodiment 1. <Description of Configuration> A heat dissipation member 100 according to embodiment 1 will be described with reference to Figures 1 to 5. Figure 1 is a schematic diagram of the shape of the heat dissipation member 100 at low temperature. Figure 1(a) is a perspective view of the heat dissipation member 100. Figure 1(a) shows XYZ coordinates. Figure 1(b) shows the YZ plane of the heat dissipation member 100. Figure 1(c) shows the ZX plane of the heat dissipation member 100. Figure 1(c) schematically shows the spiral shape of the heat dissipation member 100.

[0011] The heat dissipation member 100 includes a laminate 100L including a plurality of composite material layers having a fiber orientation. As shown in FIG. 1A, the laminate 100L has a roll-like shape formed by winding a plate-like body. The laminate 100L has at least two composite material layers having different fiber orientations. The laminate 100L has a fiber orientation arrangement of the plurality of composite material layers arranged asymmetrically in the stacking direction.

[0012] <Thermal Deformation of Laminate 100L> The laminate 100L undergoes an autonomous shape change from the roll shape due to thermal expansion and contraction caused by temperature changes in the laminate 100L. The shape change of the laminate 100L is at least one of a change from the roll shape to an extension in the width direction of the laminate 100L, and a change from the roll shape to an unraveling. The width of the plate-like body is Y1 shown in FIG. 1(c), and the width direction is the +Y direction or −Y direction shown in FIG. 1(c). The change from the roll shape to an extension in the width direction of the laminate 100L will be described later with reference to FIG. 2. The change from the roll shape to an unraveling will be described later with reference to FIG. 6 of the second embodiment.

[0013] The heat dissipation member 100 is attached to the satellite by attaching the outer peripheral end 101 of the heat dissipation member 100 to a fixture 140 fixed to the satellite. The fixture 140 is shown by a two-dot chain line in (b) of Figure 1. It should be noted that the fixture 140 may also be attached to the inner peripheral end 102 of the heat dissipation member 100.

[0014] <Roll Form> As shown in Fig. 1(a), the heat dissipation member 100 has a spiral roll shape. Between the layers in the roll, there are gaps 104 as shown in area 103. This is because friction does not occur between the layers. Note that the layers in the roll are different from the layers in the laminate described below. The layers in the roll are the layers when the plate-like body is wound into a roll, and the layers in the laminate are the layers in the laminate structure of the plate-like body.

[0015] <Shape at High Temperature> FIG. 2 is a schematic diagram showing the shape of the heat dissipation member 100 at high temperatures. FIG. 2 illustrates the state in which the heat dissipation member 100 deforms in the −Y direction (plate width direction) when the temperature of the heat dissipation member 100 changes from the temperature shown in FIG. 1 to a high temperature. The shape of the laminate 100L in FIG. 2 changes from a roll shape to an extension in the plate width direction (−Y direction). The temperature of the heat dissipation member 100 increases due to heat transfer from the satellite to the heat dissipation member 100 and absorption of sunlight and albedo radiation. Albedo radiation is sunlight reflected by the Earth or the Moon and directed toward the satellite. The temperature increase of the heat dissipation member 100 causes thermal deformation of the heat dissipation member 100. When the outer peripheral end 101 is fixed to a fixture, thermal deformation causes the heat dissipation member 100 to extend from the roll shape shown in FIG. 1 in the −Y direction shown in FIG. 2. Extension in the −Y direction significantly increases the area of ​​the heat dissipation member 100 that radiates toward outer space. By increasing the area of ​​the heat dissipation member 100 that radiates heat toward outer space, the radiation from the heat dissipation member 100 increases significantly, facilitating the heat dissipation from the satellite.

[0016] <Temperature Decrease> When the heat generation of the satellite decreases and heat transport slows down, the temperature of the heat dissipation member 100 decreases. The temperature decrease of the heat dissipation member 100 causes thermal deformation, and eventually the heat dissipation member 100 autonomously returns to the rolled shape shown in FIG. 1 without the application of an external force.

[0017] <Fiber Orientation of Laminate> Fig. 3 is a schematic diagram showing the AA cross section of the cut portion 110 (Fig. 2) of the heat dissipation member 100. The AA cross section shows a two-layer laminate 100L having fiber orientation.

[0018] As shown in Figure 3, the laminate 100L includes two composite material layers. One composite material layer has a fiber orientation of +45 degrees, and the other composite material layer has a fiber orientation of -45 degrees. The upper layer 111 and the lower layer 112 are both carbon fiber reinforced plastic UD (uni-directional) materials. The upper layer 111 is the outer layer of the roll, and the lower layer 112 is the inner layer of the roll. The fiber orientation of the upper layer 111 is +45 degrees, and the fiber orientation of the lower layer 112 is -45 degrees.

[0019] Carbon fiber reinforced plastic laminates generally have symmetric fiber orientation in the thickness direction. In other words, in the case of a two-layer laminate such as that shown in FIG. 3 , if the upper layer 111 has a fiber orientation of +45 degrees, the lower layer 112 also has a fiber orientation of +45 degrees. In contrast, the heat dissipation member 100 has an asymmetric fiber orientation in the thickness direction. As shown in FIG. 3 , the upper layer 111 has a fiber orientation of +45 degrees, while the lower layer 112 has a fiber orientation of -45 degrees. Therefore, the fiber orientations of the upper layer 111 and the lower layer 112 are asymmetric in the thickness direction (Z direction). In FIG. 7 , which will be described later, the fiber orientation stacking arrangement, from the surface layer side to the inner layer side of the roll, is the upper surface layer 121, the upper inner layer 122, the lower inner layer 124, and the lower surface layer 125. In FIG. 7 , the upper surface layer 121 is made of glass fiber reinforced plastic with a fiber orientation of 90 degrees. The upper inner layer 122 is made of carbon fiber reinforced plastic with a fiber orientation of 90 degrees. The lower inner layer 124 is made of carbon fiber reinforced plastic with a fiber orientation of 0 degrees. The lower surface layer 125 is made of glass fiber reinforced plastic with a fiber orientation of 0 degrees. When considering the symmetry of the fiber orientation in the thickness direction, the central layer 123 between the upper inner layer 122 and the lower inner layer 124 corresponds to the axis of symmetry in the stacking direction (Z direction). With respect to the central layer 123, there are two layers with a fiber orientation of 90 degrees above the central layer 123, and two layers with a fiber orientation of 0 degrees below the central layer 123. Therefore, the laminate 100L in FIG. 7 has at least two composite material layers with different fiber orientations, and the fiber orientations of the multiple composite material layers (upper surface layer 121, upper inner layer 122, lower inner layer 124, and lower surface layer 125) are arranged asymmetrically in the stacking direction (Z direction).

[0020] <Fiber Orientation and Material Properties> Orientation control that combines fiber orientation and material properties enables thermal deformation primarily due to torsional deformation. Thermal deformation primarily due to torsional deformation allows the heat dissipation member 100 to autonomously change its radiation area in response to changes in the temperature of the heat dissipation member 100.

[0021] <Composite Material> The upper layer 111 and the lower layer 112 shown in FIG. 3 are both assumed to be made of carbon fiber reinforced plastic. (1) However, the composite material is not limited to carbon fiber reinforced plastic. The upper layer 111 and the lower layer 112 are not limited to carbon fiber reinforced plastic, and fibers other than carbon fiber, such as glass fiber reinforced plastic and aramid fiber reinforced plastic, can also be used. (2) The upper layer 111 and the lower layer 112 may be made of a combination of different fiber types. (3) Although it is assumed that the heat dissipation member 100 is made of a UD material made of carbon fiber reinforced plastic, discontinuous fibers may be used to give the heat dissipation member 100 a fiber orientation. (4) The matrix of the composite material may be a thermosetting resin, a thermoplastic resin, or a metal.

[0022] <Emissivity Control> FIG. 4 shows differences in emissivity on the surface of the heat dissipation member 100. The surface of the heat dissipation member 100 may be coated to suppress radiation. The coating on the outermost surface in the low-temperature state of FIG. 1 is preferably a material with low emissivity, such as a metal such as aluminum, that reflects external radiation, such as albedo from the Earth or the Moon, and suppresses radiation from the heat dissipation member 100. On the other hand, if heat dissipation by radiation is desired, the surface exposed by thermal deformation is preferably made of a material with high emissivity, such as ceramic or black paint. In FIG. 4(a), the laminate 100L has multiple regions with different emissivities on its surface. In FIG. 4(a), the emissivity of the region near the center of the spiral surrounded by the dotted line is high, and the emissivity outside the dotted line is lower than that of the region surrounded by the dotted line. It is also possible to configure the region near the center of the spiral surrounded by the line to have a low emissivity, and the emissivity outside the dotted line to be higher than that of the region surrounded by the dotted line. In (b) of Figure 4, the laminate 100L has different emissivities between a front surface 113 in the stacking direction and a back surface 114 on the back side of the front surface 113. That is, in (b) of Figure 4 which shows a roll shape, the front surface 113 in the stacking direction is the surface on the dotted line side. The back surface 114 is the surface on the back side of the dotted line. In (b) of Figure 4, the emissivity of the front surface 113 is high, and the emissivity of the back surface 114 is lower than that of the front surface 113. Note that a configuration in which the emissivity of the front surface 113 is low and the emissivity of the back surface 114 is higher than that of the front surface 113 is also possible.

[0023] <Manufacturing method of heat dissipation member 100> The heat dissipation member 100 is manufactured taking into consideration the temperature at which the shape shown in Figure 1 is obtained, the temperature during manufacturing, and the amount of deformation expected from the layer structure of the laminate. That is, for the heat dissipation member 100, the temperature at the time shown in Figure 1 is assumed to be 0 degrees Celsius. Since the molding temperature for carbon fiber reinforced plastic is 130 degrees Celsius, the member is molded into a shape corresponding to the amount of deformation caused by a temperature difference of 130 degrees.

[0024] FIG. 5 shows an overview of a manufacturing method for the heat dissipation member 100. FIG. 5(a) shows a process of covering one surface 105 of a plurality of composite materials 100LB in the stacking direction (Z direction) and the other surface 106 in the opposite direction (-Z direction) with an anti-sticking member. FIG. 5(b) shows a state in which one surface 105 and the other surface 106 of a plurality of composite materials 100LB are covered with release films 131 and 132 of the anti-sticking member. FIG. 5(c) shows a state in which the heat dissipation member 100 does not have overlapping spiral layers when formed into a roll shape.

[0025] The method for manufacturing the heat dissipation member 100 includes the following steps (1) and (2): (1) a step of covering, when stacking multiple composite materials having a fiber orientation, one surface 105 in one stacking direction (+Z direction) of the stacked multiple composite materials and another surface 106 in the opposite direction (-Z direction) to the one stacking direction with an anti-sticking member that prevents adhesion between the one surface 105 and the other surface 106. (2) a step of forming the multiple composite materials into a roll by winding the multiple composite materials, whose one surface 105 and other surface 106 are covered with the anti-sticking member, around a molding die.

[0026] The plurality of composite materials 100LB are a plurality of composite materials arranged in layers before being formed into the roll-shaped laminate 100L. As shown in FIG. 5B, the upper side of the plurality of composite materials 100LB is covered with a release film 131, and the lower side is covered with a release film 132. The release films 131 and 132 are examples of anti-sticking members. When formed into a roll, the plurality of composite materials 100LB are sandwiched between the release films. This prevents adhesion between the one-side surface 105 and the other-side surface 106 during forming, even when the heat dissipation member 100 has the spiral layer overlap shown in FIG. 1C. Therefore, a roll-shaped heat dissipation member 100 is obtained in which the one-side surface 105 and the other-side surface 106 are not adhered to each other.

[0027] The anti-sticking member is not limited to a release film as long as it can be peeled off without damage from the one side surface 105 and the other side surface 106 after the heat dissipation member 100 is formed. Note that if a roll shape is formed in which no overlapping of spiral layers occurs, as shown in Figure 5(c), the use of release films 131 and 132 is unnecessary.

[0028] In roll molding, where overlapping spiral layers occur, the mold is preferably tapered cone-shaped so that gaps 104 are formed between the spiral layers during molding. A prepreg with unidirectionally aligned fibers and impregnated with resin is preferably used as the molding material, and autoclave molding is preferably employed as the molding method. The heat dissipation member 100 may be formed by laminating multiple carbon fiber reinforced plastics and molding them using RTM (Resin Transfer Molding). Pultrusion molding may also be used during RTM. RTM is a molding method in which resin is impregnated and molded. When continuous fibers are not used, the heat dissipation member 100 may be molded using injection molding, BMC (Bulk Mold Compound), or SMC (Sheet Mold Compound).

[0029] <Stopper> If the heat dissipation member 100 unintentionally drops to a temperature lower than the temperature (0 degrees Celsius) of the shape shown in Figure 1, it will stretch from the roll shape shown in (a) of Figure 1 in the +Y direction, increasing the heat dissipation area. That is, the laminate 100L stretches in one direction (-Y direction) in the plate width direction and in the opposite direction (+Y direction) to the one direction, and the heat dissipation member 100 further includes a stopper that prevents the laminate 100L from stretching in the opposite direction. In this way, it is preferable to provide a stopper 150 (Figure 1) that prevents the heat dissipation member 100 from stretching in the opposite direction (+Y direction).

[0030] Furthermore, it is preferable that the fixture 140 (FIG. 1) connecting the heat dissipation member 100 and the satellite has high thermal conductivity. For example, a highly thermally conductive graphite sheet may be used for the fixture 140. Furthermore, some of the material of the fixture 140 may be molded simultaneously with the heat dissipation member 100 to form an integrated structure.

[0031] ***Effects of Embodiment 1*** (1) The heat dissipation member 100 includes a laminate including multiple composite material layers. The laminate 100L autonomously changes shape from a roll shape due to thermal expansion and contraction caused by temperature changes in the heat dissipation member 100. Therefore, the heat dissipation member 100 can control the amount of heat dissipation depending on whether it is in sunlight or shade, and can provide a lightweight heat dissipation member. (2) The heat dissipation member 100 includes the stopper 150 shown in FIG. 1 , which prevents thermal deformation due to unintended low temperatures. (3) As described with reference to FIG. 4 , the heat dissipation member 100 has different emissivities on the surface of the laminate 100L, allowing for precise control of heat dissipation. (4) In the manufacturing method of the heat dissipation member 100, as shown in FIG. 5 , the one side surface 105 and the other side surface 106 are covered with an anti-sticking member, which prevents sticking between the one side surface 105 and the other side surface 106 during roll formation.

[0032] Second Embodiment A heat dissipation member 100 according to a second embodiment will be described below with reference to Figures 6 and 7. The heat dissipation member 100 according to the second embodiment will be described with respect to differences from the heat dissipation member 100 according to the first embodiment.

[0033] The heat dissipation member 100 of embodiment 2 is characterized in that the direction of thermal deformation is the circumferential direction. Figure 6 schematically shows the state of the heat dissipation member 100 of embodiment 2 at high temperatures. The heat dissipation member 100 extends in the X1 direction from the roll shape of Figure 1. This significantly increases the area of ​​the heat dissipation member 100 that radiates toward space. The shape change of the laminate 100L is a change in the unraveling of the roll. As shown in Figure 6, the unraveling of the roll is a decrease in the curvature in the circumferential direction of the roll in at least a portion of the roll.

[0034] <Laminated Structure> FIG. 7 is a schematic diagram of the cross section B-B of the heat dissipation member 100 at the cutting point 120. The laminate 100L includes at least four composite material layers. From the inside to the outside of the roll, the composite material layers are referred to as a first composite material layer, a second composite material layer, a third composite material layer, and a fourth composite material layer. (c) of FIG. 1 and FIG. 6 show the roll-shaped inner surface 107 and the roll-shaped outer surface 108. The roll-shaped inner surface 107 is located on the inside of the roll, and the roll-shaped outer surface 108 is located on the outside of the roll. In FIG. 6, the roll-shaped outer surface 108 is the back surface of the roll-shaped inner surface 107. In FIG. 6, from the roll-shaped inner surface 107 to the roll-shaped outer surface 108, the composite material layers are referred to as a first composite material layer, a second composite material layer, a third composite material layer, and a fourth composite material layer. In FIG. 7, the first composite material layer is the upper surface layer 121. The second composite layer is the upper inner layer 122. The third composite layer is the lower inner layer 124. The fourth composite layer is the lower surface layer 125.

[0035] In Figure 7, the heat dissipation member 100 is made up of six layers: five laminated layers and one coating layer. The upper side is in the Z direction. The upper surface layer 121 is made of glass fiber reinforced plastic with a fiber orientation of 90 degrees. The upper inner layer 122 is made of carbon fiber reinforced plastic with a fiber orientation of 90 degrees. The center layer 123 is a highly thermally conductive graphite sheet. The lower inner layer 124 is made of carbon fiber reinforced plastic with a fiber orientation of 0 degrees. The lower surface layer 125 is made of glass fiber reinforced plastic with a fiber orientation of 0 degrees. The bottom layer is the coating layer 126.

[0036] The laminate 100L has a high thermal conductivity layer between the composite material layers of the plurality of composite material layers, the high thermal conductivity layer having a higher thermal conductivity than any of the composite material layers of the plurality of composite material layers. The central layer 123 described below is an example of a high thermal conductivity layer.

[0037] By providing a layer with high thermal conductivity (high thermal conductivity layer) in the central layer 123, the temperature distribution within the heat dissipation member 100 is reduced, thereby improving heat dissipation efficiency. The coating layer 126 is made of ceramic and a binder. The ceramic increases emissivity, and the binder suppresses cracking during deformation. Glass fiber reinforced plastic has a larger thermal expansion than carbon fiber reinforced plastic. Therefore, using glass fiber reinforced plastic allows for greater deformation. On the other hand, carbon fiber reinforced plastic has a higher thermal conductivity than glass fiber reinforced plastic. Therefore, using carbon fiber reinforced plastic and glass fiber reinforced plastic in combination can achieve both a large amount of deformation and a large amount of heat dissipation. The required amount of deformation of the heat dissipation member 100 varies depending on the relationship between the expected temperature range and the required heat dissipation area. When large deformation is required with a small temperature change, it is preferable to use multiple types of materials in combination.

[0038] ***Effects of Embodiment 2*** In the heat dissipation member 100, the change in shape of the laminate 100L is a change in which the roll unwinds, so a larger heat dissipation area can be ensured compared to the heat dissipation member 100 of Embodiment 11. The heat dissipation member 100 has the laminate structure shown in FIG. 7, so the roll unwinds in the -Y direction. In addition, in the structure shown in FIG. 7, the central layer 123 is a highly thermally conductive graphite sheet, so the heat dissipation member 100 can dissipate heat efficiently. In addition, in the structure shown in FIG. 7, the bottom layer is the coating layer 126, so it is possible to balance thermal deformation and heat dissipation.

[0039] 100 Heat dissipation member, 100L Laminate, 100LB Multiple composite materials, 101 Outer peripheral end, 102 Inner peripheral end, 103 Range, 104 Gap, 105 One side surface, 106 Other side surface, 107 Roll-shaped inner surface, 108 Roll-shaped outer surface, 110 Cutting portion, 111 Upper layer, 112 Lower layer, 113 Surface, 114 Back surface, 120 Cutting portion, 121 Upper surface layer, 122 Upper inner layer, 123 Central layer, 124 Lower inner layer, 125 Lower surface layer, 131, 132 Release film, 140 Tool, 150 Stopper.

Claims

1. A heat dissipation component comprising a laminate including a plurality of composite material layers having a fiber orientation, the laminate having a roll-like shape formed by winding a plate-like body, at least two composite material layers having different fiber orientations, the fiber orientations of the plurality of composite material layers being arranged asymmetrically in the stacking direction, and the heat dissipation component autonomously undergoing a shape change from the roll shape due to thermal expansion and contraction accompanying a change in temperature.

2. A heat dissipation member according to claim 1, wherein the change in shape of the laminate is at least one of a change from the roll to an extension in the width direction of the plate-like body and a change in the roll to an unraveling.

3. A heat dissipation member as described in claim 2, wherein the change in the roll as it unravels is a decrease in curvature in the circumferential direction of the roll in at least a portion of the roll.

4. A heat dissipation member according to any one of claims 1 to 3, wherein the laminate has a plurality of regions on its surface with different emissivity.

5. A heat dissipation member according to any one of claims 1 to 4, wherein the laminate has a surface in the stacking direction and a back surface opposite the surface in the stacking direction that have different emissivity.

6. A heat dissipation member according to any one of claims 1 to 5, wherein the laminate has a high thermal conductivity layer between adjacent composite material layers of the plurality of composite material layers, the high thermal conductivity layer having a higher thermal conductivity than any of the composite material layers of the plurality of composite material layers.

7. A heat dissipation member according to claim 1, wherein the change in shape of the laminate is a change from the roll shape to an extension in the plate width direction.

8. A heat dissipation member as described in claim 7, wherein the laminate comprises two composite material layers, one of the composite material layers having a fiber orientation of +45 degrees and the other of the composite material layers having a fiber orientation of -45 degrees.

9. A heat dissipation member as described in claim 7 or claim 8, wherein the laminate extends in one direction of the plate width direction and in a direction opposite to the one direction, and the heat dissipation member further comprises a stopper that prevents the laminate from extending in the opposite direction.

10. The heat dissipation member according to claim 1, wherein the change in shape of the laminate is a change in which the roll is unraveled.

11. The heat dissipation member described in claim 10, wherein the laminate comprises at least four of the composite material layers, and when the composite material layers from the inside to the outside of the roll are designated as a first composite material layer, a second composite material layer, a third composite material layer and a fourth composite material layer, the first composite material layer is a glass fiber reinforced plastic with a fiber orientation of +90 degrees, the second composite material layer is a carbon fiber reinforced plastic with a fiber orientation of +90 degrees, the third composite material layer is a carbon fiber reinforced plastic with a fiber orientation of 0 degrees, and the fourth composite material layer is a glass fiber reinforced plastic with a fiber orientation of 0 degrees.

12. A method for manufacturing a heat dissipation member, comprising covering one side surface in one stacking direction of the multiple composite materials having fiber orientation and another side surface in the other stacking direction opposite to the one stacking direction with an anti-sticking member that prevents adhesion between the one side surface and the other side surface, and winding the multiple composite materials with the one side surface and the other side surface covered with the anti-sticking member around a molding die to mold the multiple composite materials into a roll.

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