Heat sink and manufacturing method of the same
Patent Information
- Application Number
- JP2023134077
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-21
- Publication Date
- 2025-03-06
Smart Images
Figure 2025029434000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a heat sink and a method for manufacturing a heat sink. [Background technology]
[0002] Conventionally, a heat sink is provided in a device such as a battery system. For example, the battery system has a cell group composed of a plurality of cells, and the cell group generates heat due to, for example, charging and discharging of the cells. The heat sink can cool the cell group.
[0003] Phase change materials (PCMs) are also known for cooling applications, and can cool cells using the latent heat generated when a phase change material melts from a solid to a liquid, for example. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] WO2021 / 181619 publication Summary of the Invention [Problem to be solved by the invention]
[0005] For example, when a phase change material is filled into a filling space provided inside a container, the phase change material is filled into the filling space through an opening at the top of the container, and then the opening is closed with a lid. However, when the lid is attached to the container with a thermoplastic resin or adhesive, the phase change material may absorb heat, hindering adhesion and reducing the efficiency of the lid attachment work.
[0006] It is an object of the present invention to provide a heat sink containing phase change material that is efficiently manufacturable and a method for manufacturing the heat sink. [Means for solving the problem]
[0007] In order to solve the above problem, the heat sink of the present embodiment includes a filling component and a phase change material. The filling component has a metal frame and is provided with a plurality of filling spaces separated by the metal frame. The phase change material is filled into the plurality of filling spaces. The filling component has a first outer surface and a second outer surface located opposite to the first outer surface. The plurality of filling spaces are adjacent to each other in a direction along the first outer surface. The metal frame has an outer peripheral surface surrounding the plurality of filling spaces between the first outer surface and the second outer surface. The metal frame is provided with a plurality of first holes each communicating one of the plurality of filling spaces with the outer peripheral surface, and a plurality of second holes each communicating one of the plurality of filling spaces with the outer peripheral surface. Each of the plurality of first holes communicates with one of the plurality of second holes via at least one of the plurality of filling spaces. [Brief description of the drawings]
[0008] [Figure 1] FIG. 1 is an exemplary perspective view of a battery system according to a first embodiment. [Diagram 2] FIG. 2 is an exemplary perspective view showing an enlarged portion of the filling part of the first embodiment. [Diagram 3] FIG. 3 is an exemplary plan view showing the filling part of the first embodiment. [Figure 4] FIG. 4 is an exemplary plan view showing a filling part of the second embodiment. [Diagram 5] FIG. 5 is an exemplary plan view showing a filling part of the third embodiment. [Figure 6] FIG. 6 is an exemplary side view showing a filling part of the fourth embodiment. [Figure 7] FIG. 7 is an exemplary cross-sectional view showing a part of the filling part of the fourth embodiment taken along the line AA′ in FIG. [Figure 8] FIG. 8 is an exemplary side view showing the filling part of the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] (Embodiment 1 of the heat sink) Hereinafter, an exemplary and schematic embodiment of a battery system 1 including a heat sink 2 will be disclosed with reference to FIGS. 1 to 3. In the following description, the X-axis direction, the Y-axis direction, and the Z-axis direction are defined for convenience. The X-axis direction, the Y-axis direction, and the Z-axis direction are mutually orthogonal. For example, the plane formed by the X-axis direction and the Y-axis direction is a horizontal plane, and the Z-axis direction is a vertical direction. The X-axis direction is a direction along the longitudinal direction of the heat sink 2. The Y-axis direction is a direction along the lateral direction of the heat sink 2. The Z-axis direction is a direction along the height direction of the heat sink 2. The X-axis direction includes the +X direction and the -X direction. The Y-axis direction includes the +Y direction and the -Y direction. The Z-axis direction includes the +Z direction (upward) and the -Z direction (downward). In the present embodiment, the expressions indicating directions such as up and down are names for convenience, and do not limit the position, attitude, and usage mode of the heat sink 2.
[0010] The battery system 1 of this embodiment is installed in various devices, machines, facilities, etc., and is used as a power source for these various devices, machines, and facilities. The battery system 1 can be used as a mobile power source such as a power source for automobiles, railway vehicles, etc., and can also be used as a stationary power source such as a power source for a UPS (uninterruptible power supply) system. The battery system 1 is also called a battery pack.
[0011] Fig. 1 is an exemplary perspective view of a battery system 1 according to a first embodiment. As shown in Fig. 1, the battery system 1 includes a heat sink 2, a plurality of cells 20, three cell gripping portions 30, a case 40, and three plastic materials 50.
[0012] The cell 20 is also referred to as a battery cell, a single cell, or a battery. The cell 20 is, for example, a non-aqueous electrolyte secondary battery such as a lithium ion battery that can be charged and discharged. The cell 20 is a can cell formed in a prismatic shape. The cell 20 has a pair of long sides 22 and a bottom surface 24.
[0013] The cell gripping part 30 has, for example, insulating properties and grips the multiple cells 20 so as to cover a pair of long side surfaces 22 and bottom surfaces 24 of the multiple cells 20. The cell gripping part 30 is formed of a heat dissipating material such as aluminum, and has a rectangular bottom plate 31 whose longitudinal direction is the X-axis direction and whose short side direction is the Y-axis direction. The bottom plate 31 extends horizontally relative to a horizontal plane (XY plane). Partition plates 32 are erected vertically or approximately vertically on the upper surface of the bottom plate 31 and are equally spaced from each other in the Y-axis direction.
[0014] In the battery system 1, for example, nine partition plates 32 are erected on the bottom plate 31, and one cell 20 is disposed between one partition plate 32 adjacent to another partition plate 32 in the Y-axis direction. The cell 20 is fitted into the cell gripping part 30 such that the bottom surface 24 of the cell 20 abuts against the bottom plate 31 of the cell gripping part 30, and a pair of long side surfaces 22 of the cell 20 abut against adjacent partition plates 32 in the Y-axis direction of the cell gripping part 30. That is, the cell gripping part 30 can clamp and fix a plurality of cells 20 from both sides in the Y-axis direction, and can also remove each cell 20 by pulling it out.
[0015] One cell gripping part 30 grips eight cells 20 aligned in the Y-axis direction. The eight cells 20 aligned in the Y-axis direction are referred to as a cell row 20A. In the cell row 20A, adjacent cells 20 in the Y-axis direction are insulated by partition plates 32. The battery system 1 has three cell rows 20A integrated with the cell gripping part 30 aligned in the X-axis direction. For example, the cells 20, which are lithium-ion batteries, have low energy density, but there are almost no gaps between the multiple cells 20 gripped by the cell gripping part 30, and the cells 20 can be aligned at high density.
[0016] It should be noted that the cell gripping portion 30 is not limited to the example shown in FIG. 1, and for example, the three cell gripping portions 30 shown in FIG. 1 may be integrated to form one cell gripping portion.
[0017] The case 40 accommodates a plurality of cells 20 arranged in parallel and held by the cell holding portion 30. The case 40 includes an upper case 40A having a rectangular lid shape in a plan view, and a lower case 40B that is combined with the upper case 40A.
[0018] 1, the case 40 is shown simplified by a two-dot chain line to explain the internal structure of the battery system 1. Examples of materials for forming the case 40 include engineering plastic resins having electrical insulation properties, such as polypropylene (PP), polyphenylene ether (PPE), polycarbonate (PC), and polybutylene terephthalate (PBT). In addition, metals may be used in combination with the above-mentioned resins as materials for forming the case 40.
[0019] The upper case 40A covers the multiple cells 20 from the +Z direction. In other words, the upper case 40A serves as an upper lid for the battery system 1. The lower case 40B covers the multiple cells 20 from the -Z direction. An upper surface 40B1 of the lower case 40B is in contact with the bottom plate 31 of the cell gripping part 30. A lower surface 40B2 of the lower case 40B supports the cell gripping part 30 gripping the multiple cells 20 from below in the Z axis direction.
[0020] The lower surface of the bottom plate 31 of the cell gripping part 30 which grips the multiple cells 20 shown in FIG. 1 and is housed in the lower case 40B is adhered to the upper surface 40B1 of the lower case 40B, for example, by an adhesive or double-sided tape (not shown).
[0021] The plastic material 50 is housed in, for example, a frame hole formed through the lower surface 40B2 of the lower case 40B, and is in close contact with the lower surface of the cell gripping portion 30. The plastic material 50 is deformable to conform to the lower surface of the cell gripping portion 30.
[0022] The plastic material 50 has a higher thermal conductivity than the lower case 40B and air. The plastic material 50 may be a resin having plasticity and electrical insulation, such as silicone. Each of the plastic materials 50 has a lower thermal conductivity than the metal plate 60 described later.
[0023] The plastic material 50 is sandwiched between the cell gripping part 30 gripping the multiple cells 20 and a metal plate 60 (described later) in the height direction of the battery system 1. When a predetermined pressing force is applied to the cells 20 from above to below in the Z-axis direction by a press machine or the like, the plastic material 50 can flexibly deform in accordance with the approximately flat lower surface of the cell gripping part 30. In addition, the plastic material 50 is selected to have sufficient adhesion and adhesiveness to the lower surface of the cell gripping part 30 and the upper surface of the metal plate 60.
[0024] The heat sink 2 cools the multiple cells 20 through the plastic material 50 and the cell gripping portion 30. The heat sink 2 includes a metal plate 60, a phase change material 70, and a filling part 80. The metal plate 60 is an example of a lid.
[0025] The metal plate 60 is a heat dissipation member that is disposed below the cell gripping part 30 and is bonded to the cell gripping part 30 via the plastic material 50. The metal plate 60 has, for example, an insulating layer formed on its surface. The insulating layer of the metal plate 60 is, for example, formed by electrocoating, or formed by attaching a sheet-like material having insulating properties in advance.
[0026] The material of the metal plate 60 is, for example, aluminum, an aluminum alloy, a copper plate, etc. The metal plate 60 is adhered to the lower case 40B by, for example, an adhesive from the lower side where the bottom plate 31 is located in the height direction (Z-axis direction) of the battery system 1.
[0027] The metal plate 60 is disposed above the filling part 80. In the example shown in Fig. 1, the metal plate 60 is formed in a generally rectangular shape in plan view so as to cover the filling part 80 from above, but may be formed to appropriate dimensions and shapes as necessary.
[0028] Fig. 2 is an exemplary perspective view showing an enlarged portion of the filling part 80 of the first embodiment. Fig. 3 is an exemplary plan view showing the filling part 80 of the first embodiment. As shown in Figs. 2 and 3, the phase change material 70 is filled into a plurality of filling spaces 82 provided inside the filling part 80. After the filling, the phase change material 70 is cooled to about room temperature (e.g., 25°C), so that the phase change material 70 becomes solid while remaining filled in each filling space 82.
[0029] The phase change material 70 is, for example, a non-flammable material that is in a solid state at room temperature of about 25° C. and has a melting point at which it undergoes a phase change from solid to liquid of 45 to 65° C. The phase change material 70 has, for example, a thermal conductivity of about 0.2 W / mK to about 0.4 W / mK.
[0030] In this embodiment, for example, polyethylene glycol (PEG) having a melting point of about 35 to 50° C. is used as the phase change material 70. Note that the phase change material 70 is not limited to polyethylene glycol, and may be paraffin or the like.
[0031] The filling part 80 has a number of walls 83, a metal frame 84, an upper surface 86, a lower surface 87, and a cover 88. The upper surface 86 is an example of a first outer surface. The lower surface 87 is an example of a second outer surface.
[0032] The walls 83 and the metal frame 84 are an integrally formed metal member. The walls 83 and the metal frame 84 are formed, for example, by cutting a thick metal member that is rectangular in plan view. Note that the walls 83 and the metal frame 84 are not limited to this example.
[0033] In this embodiment, upper surface 86 is a surface that extends in the horizontal direction at the upper end (+Z direction) of wall 83 and metal frame 84, which are integral. Upper surface 86 faces the +Z direction. Lower surface 87 is located on the opposite side of upper surface 86. That is, lower surface 87 is a surface that extends in the horizontal direction at the lower end (-Z direction) of wall 83 and metal frame 84, which are integral. Lower surface 87 faces the -Z direction.
[0034] The metal frame 84 divides the horizontal plane (XY plane) of its internal space by a lattice-shaped frame. In this embodiment, the metal frame 84 divides the internal space into six equal parts in the X-axis direction and eight equal parts in the Y-axis direction.
[0035] In this embodiment, the multiple filling spaces 82 are internal spaces of the metal frame 84 divided by the metal frame 84. The multiple filling spaces 82 are partitioned by the metal frame 84 so as to be aligned in the X-axis direction and the Y-axis direction. In other words, the multiple filling spaces 82 are adjacent to each other in the X-axis direction and the Y-axis direction. The X-axis direction and the Y-axis direction are directions along the top surface 86.
[0036] Each of the multiple filling spaces 82 is formed to have a rectangular shape in a plan view. The shape of the filling spaces 82 is not limited to this, and may be, for example, an elliptical shape in a plan view. When the filling spaces 82 have an elliptical shape in a plan view, the fluidity of the phase change material 70 is further improved when the phase change material 70 is filled into each filling space 82.
[0037] 3, in this embodiment, the metal frame 84 is formed in a rectangular shape in a plan view. The shape of the metal frame 84 is not limited to this, and may be formed in a polygonal or circular shape in a horizontal plane. The metal frame 84 has an outer peripheral surface 84a, a plurality of first holes 84b, a plurality of second holes 84c, and a plurality of flow paths 84d.
[0038] The outer peripheral surface 84a is formed in a rectangular tubular shape extending between the outer edge of the upper surface 86 and the outer edge of the lower surface 87, and faces the outside of the metal frame 84. Therefore, the outer peripheral surface 84a surrounds the multiple filling spaces 82 between the upper surface 86 and the lower surface 87.
[0039] The outer peripheral surface 84a of the metal frame 84 formed in a rectangular shape in a plan view has a side surface 84a1, a side surface 84a2, a side surface 84a3, and a side surface 84a4. The side surface 84a1 is an example of a third outer surface. The side surface 84a2 is an example of a fourth outer surface.
[0040] The side surface 84a1 is provided at an end of the metal frame 84 in the -X direction. The side surface 84a2 is provided at an end of the metal frame 84 in the +X direction. That is, the side surface 84a2 is located opposite the side surface 84a1 in the horizontal direction. The side surface 84a3 is provided at an end of the metal frame 84 in the -Y direction. The side surface 84a4 is provided at an end of the metal frame 84 in the +Y direction.
[0041] Each of the first holes 84b communicates between one of the filling spaces 82 and the outer circumferential surface 84a. In this embodiment, the first holes 84b open to the side surface 84a1. The first holes 84b are located at ends of the filling spaces 82 in the -X direction, and each of the first holes 84b communicates with each of the eight filling spaces 82 adjacent to each other in the Y axis direction.
[0042] The first holes 84b are provided near the center in the Y-axis direction at the end in the -X direction of each filling space 82. That is, in each filling space 82 in which the first holes 84b are provided, the distance from the first holes 84b to the end in the +Y direction is approximately equal to the distance from the first holes 84b to the end in the -Y direction. The position at which the first holes 84b are provided in each filling space 82 is not limited to this.
[0043] Each of the second holes 84c communicates between one of the filling spaces 82 and the outer circumferential surface 84a. In this embodiment, the second holes 84c open to the side surface 84a2. The second holes 84c are located at the ends of the filling spaces 82 in the +X direction, and each communicates with each of the eight filling spaces 82 adjacent to each other in the Y axis direction.
[0044] The second holes 84c are provided near the center in the Y-axis direction at the end in the +X direction of each filling space 82. That is, in each filling space 82 in which the second holes 84c are provided, the distance from the second holes 84c to the end in the +Y direction is approximately equal to the distance from the second holes 84c to the end in the -Y direction. The position at which the second holes 84c are provided in each filling space 82 is not limited to this.
[0045] The plurality of flow paths 84d are provided in the metal frame 84, and each of the flow paths 84d mutually communicates two adjacent filling spaces 82. In other words, the flow paths 84d are provided in the metal frame 84 located between two adjacent filling spaces 82.
[0046] In this embodiment, one flow path 84d is provided for each of the metal frames 84 located between two filling spaces 82 adjacent in the X-axis direction and the Y-axis direction. The X-axis direction includes the direction from the side surface 84a1 to the side surface 84a2, that is, the direction between the side surfaces 84a1 and 84a2. Note that some or all of the flow paths 84d that communicate two filling spaces 82 adjacent in the Y-axis direction may not be provided.
[0047] Each of the multiple flow paths 84d is a hole having a circular cross section. Liquid can flow and move between two adjacent filling spaces 82 via each flow path 84d. The position of each flow path 84d in the Z axis direction is provided near the end of the filling space 82 in the -Z direction, but is not limited to this.
[0048] In this embodiment, six rows of filling spaces 82 are provided in the X-axis direction and eight rows in the Y-axis direction inside the filling part 80. However, a non-cut portion 85 is formed in the center of the horizontal plane (XY plane) of the filling part 80. The non-cut portion 85 is a portion that is not cut and does not form a space when the filling spaces 82 are formed by cutting. Two flow paths 84d communicate with two filling spaces 82 adjacent to each other in the X-axis direction via the non-cut portion 85.
[0049] Each of the multiple first holes 84b communicates with one of the multiple second holes 84c via at least one of the multiple filling spaces 82. In this embodiment, the first hole 84b communicates with the second hole 84c via the multiple filling spaces 82 that communicate with each other via a flow path 84d.
[0050] Each of the multiple first holes 84b may communicate with one of the multiple second holes 84c via one of the multiple filling spaces 82. In this case, each filling space 82 communicates with the outer circumferential surface 84a via the first hole 84b and the second hole 84c.
[0051] The multiple walls 83 are connected to each other inside the multiple filling spaces 82 and are connected to the metal frame 84. In other words, the multiple walls 83 are contained in the multiple filling spaces 82.
[0052] The multiple walls 83 extend in the vertical direction (±Z direction) between an upper surface 86 and a lower surface 87. Ends of the multiple walls 83 in the +Z direction form a part of the upper surface 86. Ends of the multiple walls 83 in the -Z direction form a part of the lower surface 87.
[0053] The multiple walls 83 are connected to each other so as to form a hexagonal tube extending in the vertical direction (±Z direction) inside the multiple filling spaces 82. That is, the multiple walls 83 form a honeycomb structure. Note that the walls 83 are not limited to this example.
[0054] A plurality of storage spaces 82a are provided in each of the plurality of filling spaces 82. The plurality of storage spaces 82a are partitioned by a plurality of walls 83. Therefore, the storage space 82a is formed in a hexagonal prism shape extending in the vertical direction (±Z direction). The plurality of storage spaces 82a are adjacent to each other in the X-axis direction and the Y-axis direction.
[0055] The walls 83 are each provided with a groove 83a that communicates two adjacent ones of the storage spaces 82a. The groove 83a is provided at an end in the -Z direction of each of the walls 83. The position at which the groove 83a is provided is not limited thereto, and the groove 83a may be provided at an end in the +Z direction. The shape of the groove 83a is, for example, rectangular in plan view.
[0056] The phase change material 70 is filled into the plurality of containing spaces 82a in each of the plurality of filling spaces 82. Therefore, the phase change material 70 is in contact with the plurality of walls 83. Furthermore, the liquid phase change material 70 can move between the plurality of containing spaces 82a through the grooves 83a.
[0057] The heat sink 2 further includes a hot melt film 81 that attaches the metal plate 60 to the filling part 80. The hot melt film 81 is disposed between the lower surface of the metal plate 60 and the upper surface 86 of the filling part 80. The hot melt film 81 bonds the lower surface of the metal plate 60 to the upper surface 86 of the filling part 80 by being heated. The hot melt film 81 is also bonded to an end portion above the non-cut portion 85. The hot melt film 81 is an example of an adhesive member. The heat sink 2 is not limited to the hot melt film 81, and may include other adhesive members, such as an adhesive, that attach the metal plate 60 to the filling part 80.
[0058] The hot melt film 81 is made of, for example, a nylon-based material that is a thermoplastic material, and has, for example, a thermal conductivity of about 0.4 W / mK. In addition, the hot melt film 81 has, for example, an insulating property.
[0059] The hot melt film 81 is set to have a thickness of, for example, about 50 μm, and has a sufficiently low thermal resistance compared to the heat generating element, the cell 20. Therefore, assuming that the amount of heat generated [W] per cell 20 is 1 W to several W, the hot melt film 81 hardly hinders the heat transfer from the cell 20 to the filling part 80.
[0060] The material, thermal conductivity, and thickness of the hot melt film 81 are not limited to the above examples. Also, the adhesion of the metal plate 60 to the upper surface 86 of the filling part 80 is not limited to the form using the hot melt film 81.
[0061] An opening O is provided in the top surface 86. The opening O is an end of the multiple storage spaces 82a of the multiple filling spaces 82 that opens to the top surface 86. In other words, all of the multiple storage spaces 82a are open to the outside at one opening O. The metal plate 60 is attached to the top surface 86 by the hot melt film 81, thereby closing the openings O of the multiple storage spaces 82a of the multiple filling spaces 82.
[0062] The thermal resistance of the metal plate 60, the wall 83, and the metal frame 84 is sufficiently lower than that of the cell 20, which is a heat generating body. Therefore, if the heat generation amount [W] of one cell 20 is assumed to be 1 W to several W, the heat of the cell 20 is transferred to the filling part 80 via the metal plate 60, and then transferred to the phase change material 70 filled in each accommodation space 82a via the metal frame 84 and the wall 83.
[0063] The cover 88 is attached to the metal frame 84, covering the outer peripheral surface 84a of the metal frame 84. The cover 88 is formed in a rectangular frame shape in a plan view, and is formed without any gaps along the outer peripheral surface 84a of the metal frame 84. The cover 88 covers the multiple first holes 84b and the multiple second holes 84c.
[0064] The cover 88 is made of resin. The cover 88 is made of, for example, a polypropylene-based material, which is a thermoplastic material, and has a thermal conductivity of, for example, about 0.12 W / mK. The material of the cover 88 is not limited to this, and it may be a material having a lower thermal conductivity than the metal frame 84.
[0065] The heat sink 2 further has fins 89. The fins 89 have, for example, a flat base 89a extending horizontally, and a plurality of protrusions 89b arranged in a row to form a comb shape on a lower surface 89a1 of the base 89a. The fins 89 are made of, for example, copper or aluminum, but may be made of any known heat dissipating material.
[0066] The fin 89 is formed, for example, in a generally rectangular shape in plan view with approximately the same size as the filling part 80, but may be formed to appropriate dimensions and shapes as necessary. An upper surface 89a2, which is an end portion above the base 89a (in the +Z direction), is a generally flat surface. The upper surface 89a2 of the base 89a is attached to the lower surface 87 by various means.
[0067] Each of the multiple protrusions 89b is, for example, a plate-like shape that hangs down from a lower surface 89a1 of the base 89a along the -Z direction and extends along the X-axis direction. The multiple protrusions 89b are arranged in parallel in the Y-axis direction, and form a comb shape.
[0068] Bolt holes H are formed in the four corners of each of the lower case 40B, the metal plate 60, the metal frame 84, and the fins 89. Bolts (not shown) are screwed into the bolt holes H of the lower case 40B, the metal plate 60, the metal frame 84, and the fins 89. As a result, the lower case 40B, the metal plate 60, the filling part 80, and the fins 89 are fastened and fixed together.
[0069] (Heat sink manufacturing method) A manufacturing method of the heat sink 2 will be described below. In the manufacturing process of the heat sink 2, first, the fins 89 are attached to the lower surface 87. Furthermore, the metal plate 60 is attached to the upper surface 86 by a heated hot melt film 81. As a result, the multiple storage spaces 82a of the multiple filling spaces 82 are sealed.
[0070] When the hot melt film 81 is heated, the filling space 82 is not filled with the phase change material 70. Therefore, the applied heat is not absorbed by the phase change material 70, and the hot melt film 81 can be efficiently melted.
[0071] Next, the phase change material 70 is filled into the filling spaces 82 through the first holes 84b. The phase change material 70 is first flowed from the first holes 84b provided in the side surface 84a1 into each of the filling spaces 82 communicating with the first holes 84b.
[0072] The phase change material 70 that has flowed into each filling space 82 communicating with the first holes 84b flows by gravity in the X-axis and Y-axis directions through the grooves 83a and is filled in each containing space 82a within the filling space 82.
[0073] Then, the phase change material 70 is caused to flow through the flow path 84d by the action of gravity into another filling space 82 adjacent to the filling space 82 communicating with the first hole 84b. For example, the action of gravity can be generated by an operator holding the filling part 80 and tilting the filling part 80 in the Z-axis direction.
[0074] The method of generating the effect of gravity is not limited to this. For example, a holding table that is rectangular in plan view and has a slope in the Z-axis direction may be fixed below the end of filling part 80 in the +X or -X direction, and the effect of gravity may be generated by tilting filling part 80 in the Z-axis direction.
[0075] Due to the above-mentioned action of gravity, the phase change material 70 filled in one filling space 82 flows in the X-axis direction or the Y-axis direction in a chain reaction into another adjacent filling space 82. In this manner, the phase change material 70 flows into and fills all of the filling spaces 82.
[0076] When the phase change material 70 flows into each filling space 82 in a chain reaction, air in each filling space 82 is discharged from the second holes 84c provided in the side surface 84a2 located opposite to the side surface 84a1. Therefore, the phase change material 70 can be smoothly filled into each filling space 82 from the first holes 84b.
[0077] After the phase change material 70 is poured and filled into all of the filling spaces 82, the second holes 84c are sealed, for example, by a cap (not shown). Next, the cover 88 is attached to the metal frame 84. Through the above steps, the manufacture of the heat sink 2 is completed.
[0078] As described above, in this embodiment, for example, the heat sink 2 includes a filling part 80 and a phase change material 70. The filling part 80 has a metal frame 84, and a plurality of filling spaces 82 partitioned by the metal frame 84 are provided inside. The phase change material 70 is filled into the plurality of filling spaces 82. The filling part 80 has an upper surface 86 and a lower surface 87 located opposite to the upper surface 86. The plurality of filling spaces 82 are adjacent to each other in the X-axis and Y-axis directions along the upper surface 86. The metal frame 84 has an outer peripheral surface 84a surrounding the plurality of filling spaces 82 between the upper surface 86 and the lower surface 87. The metal frame 84 is provided with a plurality of first holes 84b each of which communicates one of the plurality of filling spaces 82 with the outer peripheral surface 84a, and a plurality of second holes 84c each of which communicates one of the plurality of filling spaces 82 with the outer peripheral surface 84a. Each of the plurality of first holes 84b communicates with one of the plurality of second holes 84c via at least one of the plurality of filling spaces 82.
[0079] In a conventional heat sink using a phase change material, an opening is provided at the top of a metal frame to open multiple filling spaces, and the filling spaces are filled with a phase change material through the opening. After the filling spaces are filled with the phase change material, a lid is attached to the top surface of the metal frame with an adhesive material such as a hot melt film or adhesive, and the opening is closed with the lid. The adhesive material generates an adhesive force by melting with heat applied from the outside.
[0080] When the lid is attached to the metal frame with the adhesive member, part of the heat for melting the adhesive member is absorbed by the phase change material, reducing the efficiency of the operation of attaching the lid to the metal frame with the adhesive member.
[0081] Meanwhile, in the heat sink 2 of the present embodiment, a metal frame 84 is provided with a plurality of first holes 84b, each of which communicates between one of the plurality of filling spaces 82 and the outer peripheral surface 84a, and a plurality of second holes 84c, each of which communicates between one of the plurality of filling spaces 82 and the outer peripheral surface 84a. Furthermore, each of the plurality of first holes 84b communicates with one of the plurality of second holes 84c via at least one of the plurality of filling spaces 82.
[0082] Therefore, for example, the phase change material 70 can be filled in parallel into the multiple filling spaces 82 through the multiple first holes 84b. Also, since the air in the multiple filling spaces 82 is released through the multiple second holes 84c, the phase change material 70 can be efficiently filled into the filling spaces 82.
[0083] In the heat sink 2 of this embodiment, it is not necessary to provide the metal frame 84 with a large opening O communicating with the multiple filling spaces 82. Even if the opening O is provided in the metal frame 84, the phase change material 70 can be filled into the multiple filling spaces 82 through the multiple first holes 84b after the metal plate 60 that covers the opening O is attached to the metal frame 84 by the hot melt film 81 or adhesive.
[0084] In other words, according to the heat sink 2 of this embodiment, the worker does not need to heat the hot melt film 81 or the adhesive after filling the filling space 82 with the phase change material 70, and the heat used to bond the hot melt film 81 or the adhesive can be prevented from being absorbed by the phase change material 70, thereby enabling more efficient manufacturing.
[0085] In this embodiment, for example, the filling part 80 further includes a resin cover 88 attached to the metal frame 84 to cover the outer circumferential surface 84a.
[0086] When the heat sink 2 is provided in the battery system 1, heat generated by charging and discharging the multiple cells 20 is transferred to the heat sink 2. The phase change material 70 absorbs the heat transferred from the multiple cells 20 as latent heat when melting from a solid state. Due to the above action, the temperature rise of the multiple cells 20 is suppressed.
[0087] In conventional heat sinks with phase change material, the phase change material is covered only by a metal frame with high thermal conductivity. Therefore, part of the heat transferred from the cells to the phase change material is released to the outside from the outer periphery of the metal frame, and the phase change material has difficulty absorbing the heat transferred from the cells as latent heat. Therefore, the amount of heat absorbed by the phase change material varies depending on the position, and there is a risk of uneven temperature of multiple cells.
[0088] On the other hand, in the heat sink 2 of this embodiment, the filling part 80 further includes a resin cover 88. Generally, resin has a lower thermal conductivity than metal. Therefore, the resin cover 88 can suppress a part of the heat transferred from the multiple cells 20 to the phase change material 70 from being released to the outside from the outer peripheral surface 84a of the metal frame 84. That is, in the heat sink 2 of this embodiment, the phase change material 70 can efficiently absorb the heat transferred from the multiple cells 20 to the phase change material 70 as latent heat, and thus the cooling efficiency of the multiple cells 20 can be improved.
[0089] Furthermore, in this embodiment, for example, the filling part 80 has a plurality of walls 83 housed in a plurality of filling spaces 82. A plurality of storage spaces 82a are provided in each of the plurality of filling spaces 82, the storage spaces 82a being adjacent to each other in the X-axis and Y-axis directions along the upper surface 86 and separated by the plurality of walls 83. The plurality of walls 83 are provided with grooves 83a each of which connects two adjacent storage spaces 82a to each other.
[0090] When the phase change material 70 is filled into the filling component 80, it flows into a first filling space 82 through the first holes 84b, and fills one of the accommodation spaces 82a of the filling space 82. The phase change material 70 flows into another adjacent accommodation space 82a through the groove 83a, and fills the multiple accommodation spaces 82a. In this way, the phase change material 70 flows in a chain reaction through the grooves into each accommodation space 82a, and fills the entire filling space 82.
[0091] The walls 83 are in contact with the phase change material 70 filled in the storage spaces 82a. This increases the contact area between the filling part 80 and the phase change material 70, and heat is efficiently transferred from the cells 20 to the phase change material 70. That is, in the heat sink 2 of this embodiment, the phase change material 70 can efficiently absorb the heat transferred from the cells 20 to the phase change material 70 as latent heat, thereby improving the cooling efficiency of the cells 20. In addition, the walls 83 can improve the rigidity of the filling part 80.
[0092] In this embodiment, for example, the outer peripheral surface 84a has a side surface 84a1 and a side surface 84a2 located opposite the side surface 84a1. The first holes 84b open to the side surface 84a1. The second holes 84c open to the side surface 84a2. The metal frame 84 is provided with a plurality of flow paths 84d, each of which connects two of the filling spaces 82 that are adjacent to each other in the X-axis direction between the side surfaces 84a1 and 84a2.
[0093] Therefore, when the phase change material 70 is filled into the filling part 80, it flows into the first filling space 82 through the multiple first holes 84b, and then flows in a chain reaction into the multiple filling spaces 82 that are aligned in the X-axis direction between the side surface 84a1 and the side surface 84a2. Therefore, according to the heat sink 2 of this embodiment, the multiple filling spaces 82 are efficiently filled with the phase change material 70, and thus the heat sink 2 can be manufactured more efficiently.
[0094] In the present embodiment, for example, the heat sink 2 has a metal plate 60. The multiple filling spaces 82 open to an upper surface 86. The metal plate 60 is attached to the upper surface 86 to close the multiple filling spaces 82. A manufacturing method of the heat sink 2 includes attaching the metal plate 60 to the upper surface 86 with a hot melt film 81 or an adhesive, and filling the multiple filling spaces 82 with the phase change material 70 from at least one of the multiple first holes 84b and the multiple second holes 84c.
[0095] In the manufacturing method of the heat sink 2 of this embodiment, the phase change material 70 is filled into the filling space 82 after the metal plate 60 is attached to the upper surface 86 by the hot melt film 81 or adhesive. Therefore, even when the metal plate 60 is bonded to the upper surface 86 by heating the hot melt film 81 or adhesive, there is no risk of the bonding being hindered by the heat absorption of the phase change material 70. In other words, according to the manufacturing method of the heat sink 2 of this embodiment, the heat sink 2 can be manufactured more efficiently.
[0096] (Embodiment 2 of the heat sink) The heat sink 2 of the second embodiment will be described below with reference to Fig. 4. The filling part 80B of the heat sink 2 in the second embodiment is a part of the configuration of the filling part 80 of the first embodiment described with reference to Fig. 3, and the same components as those of the filling part 80 of the first embodiment will be described with the same reference numerals as those of the filling part 80.
[0097] 4 is an exemplary plan view showing a filling part 80B of the second embodiment. As shown in FIG. 4, in the second embodiment, a plurality of first holes 84b are opened in the side surface 84a1. In addition, at least one of a plurality of second holes 84c is opened in the side surface 84a1.
[0098] As an example, in this embodiment, seven first holes 84b and one second hole 84c are opened on the side surface 84a1. Also, one first hole 84b and seven second holes 84c are opened on the side surface 84a2. The sum of the number of first holes 84b on the side surface 84a1 and the number of first holes 84b on the side surface 84a2 is equal to the sum of the number of second holes 84c on the side surface 84a1 and the number of second holes 84c on the side surface 84a2.
[0099] In each filling space 82 of this embodiment, a row in which a non-cut portion 85 is provided in the X-axis direction is referred to as row L. In rows other than row L in the X-axis direction, a second hole 84c opens on the opposite side of the first hole 84b. In the row in which the first hole 84b opens on the side surface 84a1 in the X-axis direction, the second hole 84c opens on the side surface 84a2. In the row in which the second hole 84c opens on the side surface 84a1 in the X-axis direction, the first hole 84b opens on the side surface 84a2.
[0100] A flow path 84d is provided in all of the metal frames 84 located between two filling spaces 82 adjacent in the X-axis direction. Furthermore, in this embodiment, two flow paths 84e are provided in a part of the metal frames 84 located in row L among the multiple filling spaces 82 and located between two filling spaces 82 adjacent in the Y-axis direction.
[0101] With the above arrangement, the first hole 84b opening on the side surface 84a1 and the second hole 84c opening on the side surface 84a2 communicate with each other via a plurality of filling spaces 82 that are connected in series in the X direction by flow paths 84d. Meanwhile, the first hole 84b and the second hole 84c located in row L communicate with each other via two sets of filling spaces 82 that are adjacent in the X axis direction and communicate with each other by flow paths 84d, and a flow path 84e that communicates two filling spaces 82 adjacent in the Y axis direction.
[0102] Hereinafter, a detailed description will be given of the flow of the phase change material 70 filling the filling spaces 82 in this embodiment. The phase change material 70 is flowed from the multiple first holes 84b into each filling space 82 communicating with the first holes 84b.
[0103] In the filling spaces 82 located in row L, the phase change material 70 flows between two filling spaces 82 adjacent in the Y-axis direction via the flow paths 84e, and flows toward the second holes 84c. That is, the phase change material 70 flowing through the filling spaces 82 located in row L turns back at the flow paths 84e. The phase change material 70 that turns back at the flow paths 84e flows to the second holes 84c, and is filled into the multiple filling spaces 82.
[0104] As described above, in this embodiment, for example, the outer peripheral surface 84a has a side surface 84a1 and a side surface 84a2 located on the opposite side of the side surface 84a1. The first holes 84b open to the side surface 84a1. At least one of the second holes 84c opens to the side surface 84a1.
[0105] In the heat sink 2 of this embodiment, at least one of the multiple filling spaces 82 communicates with one first hole 84b and one second hole 84c opening on the side surface 84a1 in a folded manner. In other words, the multiple filling spaces 82 do not need to communicate with each other in a straight line. This increases the degree of freedom in the arrangement of the filling spaces 82, the first holes 84b, and the second holes 84c in the design, for example.
[0106] (Embodiment 3 of the heat sink) The heat sink 2 of the third embodiment will be described below with reference to Fig. 5. A filling part 80C of the heat sink 2 in the third embodiment is a part of the configuration of the filling part 80 of the first embodiment described with reference to Fig. 2, and the same components as those of the filling part 80 of the first embodiment will be described with the same reference numerals as those of the filling part 80.
[0107] 5 is an exemplary plan view showing a filling part 80C of the third embodiment. As shown in FIG. 5, the filling part 80C has a plurality of porous bodies 83C instead of a plurality of walls 83. The plurality of porous bodies 83C are accommodated in a plurality of filling spaces 82.
[0108] The porous body 83C has a so-called lattice structure in which, for example, three-dimensional shapes in which metallic branch-like lattices are periodically arranged are arranged without gaps in the X-axis direction, the Y-axis direction, and the Z-axis direction. The porous body 83C is not limited to this example, and may have a structure in which, for example, a sponge-like structure with many fine holes is three-dimensionally arranged without gaps.
[0109] As described above, in this embodiment, for example, the filling part 80C has a plurality of porous bodies 83C accommodated in a plurality of filling spaces 82. Therefore, the phase change material 70 is filled into the holes of the porous body 83C. The porous body 83C contacts the phase change material 70 filled into the holes of the porous body 83C. Therefore, the contact area between the filling part 80C and the phase change material 70 is increased, and heat is efficiently transferred from the plurality of cells 20 to the phase change material 70. That is, in the heat sink 2 of this embodiment, the phase change material 70 can efficiently absorb the heat transferred from the plurality of cells 20 to the phase change material 70 as latent heat, and thus the cooling efficiency of the plurality of cells 20 can be improved.
[0110] (Embodiment 4 of the heat sink) The heat sink 2 of the fourth embodiment will be described below with reference to Fig. 6 and Fig. 7. A filling part 80D of the heat sink 2 in the fourth embodiment is a part of the configuration of the filling part 80 of the first embodiment described with reference to Fig. 2, and the same components as those of the filling part 80 of the first embodiment will be described with the same reference numerals as those of the filling part 80.
[0111] Fig. 6 is an exemplary side view showing a filler part 80D of the fourth embodiment. Fig. 7 is an exemplary cross-sectional view showing a part of the filler part 80D of the fourth embodiment along the line AA' in Fig. 6. As shown in Figs. 6 and 7, the heat sink 2 has two filler parts 80D. The filler part 80D has a metal frame 84D. In this embodiment, the metal frame 84D is a so-called aluminum extrusion material formed by extrusion molding using an aluminum alloy ingot.
[0112] The side surface 84a1 is provided at an end of the metal frame 84D in the -X direction. The side surface 84a2 is provided at an end of the metal frame 84D in the +X direction. That is, the side surface 84a2 is spaced apart from the side surface 84a1 in the +X direction. The +X direction is a direction along the top surface 86 and is an example of a first direction.
[0113] A plurality of filling spaces 82D are formed as linear flow paths inside a metal frame 84D made of an aluminum extrusion material. That is, the plurality of filling spaces 82D are spaces formed by extruding an aluminum alloy. Each of the plurality of filling spaces 82D extends between a side surface 84a1 and a side surface 84a2 of the metal frame 84D.
[0114] In this embodiment, in each of the two filling parts 80D, four filling spaces 82D are arranged in the Y-axis direction. The Y-axis direction is an example of a second direction. The Y-axis direction is a direction along the upper surface 86 and intersects with the +X direction (orthogonal in this embodiment). Note that the number of filling spaces 82D arranged in the Y-axis direction is not limited to this.
[0115] The filling part 80D further includes a first block 90, a second block 91, and a resin packing 92. The first block 90 and the second block 91 are formed in a rectangular shape in a plan view. The first block 90 and the second block 91 are metal members, and are made of aluminum, for example. The shapes and materials of the first block 90 and the second block 91 are not limited thereto.
[0116] The first block 90 is attached to the side surface 84a1 and closes the first holes 84b, and the second block 91 is attached to the side surface 84a2 and closes the second holes 84c.
[0117] Resin packing 92 is attached between the first block 90 and the side surface 84a1 and between the second block 91 and the side surface 84a2. The first block 90 and the side surface 84a1, and the second block 91 and the side surface 84a2 are fixed via the packing 92 by bolts (not shown).
[0118] A first hole 84b is provided at the end of each filling space 82D in the -X direction. A second hole 84c is provided at the end of each filling space 82D in the +X direction. In the X-axis direction, one filling space 82D is disposed between one first hole 84b and one second hole 84c.
[0119] The two filling parts 80D are arranged in the Y-axis direction with no gap between them, and are fixed to each other by bolts (not shown). The two arranged filling parts 80D are formed in a generally rectangular shape in plan view with approximately the same size as the fin 89, but may be formed to appropriate dimensions and shapes as necessary. The number of filling parts 80D arranged in the Y-axis direction may be only one, or may be three or more. The two filling parts 80D may be fixed to each other by, for example, double-sided tape.
[0120] The heat sink 2 further includes a sheet 100. The sheet 100 is formed, for example, in a generally rectangular shape in plan view with approximately the same size as the two filler parts 80D, but may be formed to appropriate dimensions and shapes as necessary. The sheet 100 is attached to the top surface 86, for example, by screws (not shown). In this embodiment, the top surface 86 is an end surface of the metal frame 84D in the +Z direction. That is, in this embodiment, the position where the sheet 100 is attached is the end surface of the metal frame 84D in the upper (+Z direction).
[0121] Sheet 100 has metal portion 101 in contact with upper surface 86, and resin portion 102 surrounding metal portion 101, in contact with upper surface 86, and formed integrally with metal portion 101. Metal portion 101 is disposed near the center of sheet 100 in the XY plane.
[0122] The resin portion 102 is made of, for example, silicone. When the resin portion 102 is made of silicone, the sheet 100 can improve adhesion to the upper surface 86. The material of the resin portion 102 is not limited to this, and may be other thermoplastic resins with low thermal conductivity. The metal portion 101 is made of, for example, aluminum.
[0123] Fins 89 are attached to the underside 87 of the filling part 80D. Bolt holes H are formed in the four corners of each of the first block 90, the second block 91, the sheet 100, and the fins 89. Bolts (not shown) are screwed into the bolt holes H of the filling part 80D, the sheet 100, and the fins 89. As a result, the filling part 80D, the sheet 100, and the fins 89 are fastened and fixed together in the Z-axis direction by bolts (not shown).
[0124] As described above, in this embodiment, for example, the outer peripheral surface 84a has a side surface 84a1 and a side surface 84a2. A plurality of first holes 84b are opened in the side surface 84a1. The side surface 84a2 is spaced from the side surface 84a1 in the +X direction along the upper surface 86, and a plurality of second holes 84c are opened in the side surface 84a2. The plurality of filling spaces 82D are arranged along the upper surface 86 and in the Y axis direction intersecting with the +X direction. Each of the plurality of filling spaces 82D extends between the side surface 84a1 and the side surface 84a2. The filling part 80D has a first block 90 and a second block 91. The first block 90 is attached to the side surface 84a1 to block the plurality of first holes 84b. The second block 91 is attached to the side surface 84a2 to block the plurality of second holes 84c.
[0125] The heat sink 2 of this embodiment can be manufactured by the following method. First, the second holes 84c are blocked by the packing 92 and the second block 91. Then, the phase change material 70 is poured into the first holes 84b to fill each of the filling spaces 82D. Finally, the first holes 84b are blocked by the packing 92 and the first block 90, thereby sealing all of the filling spaces 82D.
[0126] The metal frame 84D having the multiple filling spaces 82D formed therein can be formed, for example, of an extruded material having a capillary flow path. As a result, the heat sink 2 of this embodiment can reduce the manufacturing cost and cycle time compared to the conventional manufacturing method using metal cutting.
[0127] (Embodiment 5 of the heat sink) The heat sink 2 of the fifth embodiment will be described below with reference to Fig. 8. A filling part 80E of the heat sink 2 in the fifth embodiment is a part of the configuration of the filling part 80D of the fourth embodiment described with reference to Figs. 6 and 7, and the same configuration as the filling part 80D of the fourth embodiment will be described with the same reference numerals as those of the filling part 80D.
[0128] 8 is an exemplary side view showing a filling part 80E of the fifth embodiment. As shown in FIG. 8, in this embodiment, the sheet 100 is attached to the lower surface 87, for example, by a screw (not shown). That is, in this embodiment, the position where the sheet 100 is attached is different from that of the fourth embodiment, that is, the end face of the metal frame 84D on the lower side (-Z direction). Therefore, the metal part 101 and the resin part 102 are in contact with the lower surface 87.
[0129] As described above, in the fourth and fifth embodiments, the filling parts 80D and 80E further include the sheet 100 attached to the upper surface 86 or the lower surface 87. When the sheet 100 is attached to the upper surface 86, the heat generated in the multiple cells 20 is transferred to the sheet 100. The heat flux transmitted through the metal part 101 is relatively higher than the heat flux transmitted through the resin part 102. Therefore, the heat generated in the multiple cells 20 is transferred to the filling space 82D with a difference in the distribution of the heat flux in the resin part 102 and the metal part 101. In this way, the sheet 100 can change the distribution of the heat transmitted (dissipated) from the multiple cells 20 to the filling space 82D by the metal part 101. That is, the metal part 101 is disposed near the center of the multiple cells 20, where heat is difficult to dissipate, and the heat flux near the center becomes relatively high, so that the temperature distribution of the multiple cells 20 can be easily smoothed.
[0130] When the sheet 100 is attached to the lower surface 87, a part of the heat generated in the multiple cells 20 is absorbed in the filling space 82D as heat of fusion of the phase change material 70, and the remaining heat that is not absorbed reaches the sheet 100. Generally, the thermal conductivity of metal is higher than that of resin. Therefore, the heat flux of the metal part 101 becomes relatively high. Therefore, the sheet 100 can relatively increase the distribution of heat transferred to the center of the fin 89. That is, by disposing the metal part 101 near the center of the multiple cells 20 and the heat sink 2, where heat is difficult to dissipate, the heat flux near the center becomes relatively high, and the temperature distribution of the multiple cells 20 is smoothed.
[0131] As described above, the heat sink 2 of this embodiment can absorb the heat transferred from the multiple cells 20 in a distribution that smoothes the temperature distribution of the multiple cells 20, thereby improving the cooling efficiency of the multiple cells 20.
[0132] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]
[0133] 1...battery system, 2...heat sink, 60...metal plate, 70...phase change material, 80, 80B, 80C, 80D, 80E...filling parts, 81...hot melt film, 82, 82D...filling space, 82a...accommodation space, 83...wall, 83a...groove, 83C...porous body, 84, 84D...metal frame, 84a...outer surface, 84a1, 84a2...side surface, 84b...first hole, 84c...second hole, 84d, 84e...flow path, 86...upper surface, 87...lower surface, 88...cover, 90...first block, 91...second block, 100...sheet, 101...metal part, 102...resin part.
Claims
1. A filling part having a metal frame and a plurality of filling spaces separated by the metal frame; a phase change material filled in the plurality of filling spaces; Equipped with The filling piece has a first outer surface and a second outer surface opposite the first outer surface, The plurality of filling spaces are adjacent to each other in a direction along the first outer surface, the metal frame has an outer peripheral surface surrounding the plurality of filling spaces between the first outer surface and the second outer surface, and is provided with a plurality of first holes each communicating one of the plurality of filling spaces with the outer peripheral surface, and a plurality of second holes each communicating one of the plurality of filling spaces with the outer peripheral surface; Each of the plurality of first holes communicates with one of the plurality of second holes via at least one of the plurality of filling spaces. heat sink.
2. The filling part further includes a resin cover that covers the outer circumferential surface and is attached to the metal frame. The heat sink of claim 1 .
3. The filling part has a plurality of walls accommodated in the plurality of filling spaces, A plurality of storage spaces are provided in each of the plurality of filling spaces, the storage spaces being adjacent to each other in a direction along the first outer surface and being partitioned by the plurality of walls, The walls are each provided with a groove that connects two adjacent ones of the storage spaces. The heat sink of claim 1 .
4. The filling part has a plurality of porous bodies accommodated in the plurality of filling spaces. The heat sink of claim 1 .
5. The outer circumferential surface has a third outer surface and a fourth outer surface opposite the third outer surface, the plurality of first holes open to the third outer surface; the second holes are open to the fourth outer surface, The metal frame is provided with a plurality of flow paths each of which connects two of the plurality of filling spaces adjacent to each other in a direction between the third outer surface and the fourth outer surface. The heat sink of claim 1 .
6. The outer circumferential surface has a third outer surface and a fourth outer surface opposite the third outer surface, the plurality of first holes open to the third outer surface; At least one of the plurality of second holes opens to the third outer surface. The heat sink of claim 1 .
7. The outer circumferential surface has a third outer surface in which the plurality of first holes are opened, and a fourth outer surface spaced from the third outer surface in a first direction along the first outer surface and in which the plurality of second holes are opened, The plurality of filling spaces are arranged along the first outer surface in a second direction intersecting the first direction, and each of the filling spaces extends between the third outer surface and the fourth outer surface; The filling part includes a first block attached to the third outer surface and blocking the first holes, and a second block attached to the fourth outer surface and blocking the second holes. The heat sink of claim 1 .
8. A sheet attached to the first outer surface or the second outer surface; Further equipped with the sheet has a metal portion in contact with the first outer surface or the second outer surface, and a resin portion surrounding the metal portion, in contact with the first outer surface or the second outer surface, and integrally formed with the metal portion.
8. The heat sink of claim 7.
9. a filling part having a metal frame and a first outer surface, the filling part having a plurality of filling spaces therein, the filling spaces being partitioned by the metal frame so as to be adjacent to one another in a direction along the first outer surface and opening to the first outer surface; a lid attached to the first outer surface and closing the plurality of filling spaces; and a phase change material filled in the plurality of filling spaces; the metal frame has an outer circumferential surface surrounding the plurality of filling spaces, a plurality of first holes each communicating one of the plurality of filling spaces with the outer circumferential surface and a plurality of second holes each communicating one of the plurality of filling spaces with the outer circumferential surface are provided in the metal frame; Each of the plurality of first holes communicates with one of the plurality of second holes via at least one of the plurality of filling spaces. A method for manufacturing a heat sink, comprising the steps of: attaching the lid to the first outer surface by an adhesive member; filling the plurality of filling spaces with the phase change material through at least one of the plurality of first holes and the plurality of second holes; A method for manufacturing a heat sink comprising:
Citation Information
Patent Citations
Battery module and battery system
WO2021181619A1