Cold plate and method for manufacturing cold plate

Abstract

To provide a cold plate capable of inhibiting a resin cover from being deformed by pressure of a coolant.SOLUTION: A cold plate 1 comprises a metal plate 10 in which a plurality of fins 11 are formed, and a resin cover 20 for covering the plurality of fins 11. A roughened part 30 (first roughened part 30A) is formed on an apical surface 11a of at least one of the plurality of fins 11, and the roughened part 30 and the resin cover 20 are fusion-bonded.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a cold plate and a method for manufacturing a cold plate. [Background technology]

[0002] The following Patent Document 1 discloses a cold plate comprising a metal plate on which a number of fins are formed and a metal cover that covers the number of fins, with the peripheral portions of the metal plate and the metal cover being joined by injection molding with resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6712915 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the demand for cold plates is expected to increase due to the increase in heat generation density caused by the high integration of electronic components, and there is a demand for lower-cost cold plates. For this reason, the conventional metal cover is being considered for replacement with a resin cover. However, the resin cover has a lower rigidity than the metal cover, and when the pressure of the refrigerant flowing inside the cold plate is high, it may swell and deform, causing cracks.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a cold plate that can suppress deformation of a resin cover due to refrigerant pressure, and a method for manufacturing the cold plate. [Means for solving the problem]

[0006] A cold plate according to one aspect of the present invention includes a metal plate having a plurality of fins formed thereon and a resin cover covering the plurality of fins, and a roughened portion is formed on the tip surface of at least one of the plurality of fins, and the roughened portion and the resin cover are fused to each other. With this configuration, the fin and the resin cover can be firmly fused to each other by the roughened portion formed on the tip surface of the fin of the metal plate. The fin suppresses deformation of the resin cover from inside the peripheral portion of the resin cover. Therefore, it is possible to suppress deformation such as swelling of the resin cover due to the pressure of the refrigerant.

[0007] In the above cold plate, a second roughened portion may be formed on a peripheral portion of the metal plate surrounding the plurality of fins, and the second roughened portion and the resin cover may be fused together.

[0008] In the above cold plate, the resin cover may be formed with a plurality of recesses into which tip portions of the plurality of fins are inserted.

[0009] In the above cold plate, the resin cover may have a plurality of protrusions formed between the plurality of recesses to be inserted into gaps between the plurality of fins, and the tip surfaces of the plurality of protrusions may be convexly curved toward the metal plate along the longitudinal direction in which the plurality of fins extend.

[0010] In the above cold plate, the resin cover may be formed with a refrigerant distribution passage communicating with the gaps between the fins, and a second convex portion extending along the refrigerant distribution passage and protruding toward the metal plate, and a second concave portion may be formed at a tip portion of at least one of the fins to engage with the second convex portion.

[0011] In the above cold plate, the refrigerant distribution channel may be formed in a central portion in a longitudinal direction in which the plurality of fins extend.

[0012] A method for manufacturing a cold plate according to one embodiment of the present invention comprises a metal plate having a plurality of fins formed thereon and a resin cover covering the plurality of fins, and includes a step of forming a roughened portion on a tip surface of at least one of the plurality of fins, and a step of heat-fusing the roughened portion and the resin cover together. According to this method, the roughened surface formed on the tip end surface of the fin of the metal plate can firmly fuse the fin and the resin cover. The fin suppresses deformation of the resin cover from inside the peripheral edge of the resin cover. Therefore, it is possible to suppress the expansion and deformation of the resin cover due to the pressure of the refrigerant.

[0013] In the above method for manufacturing a cold plate, the roughened portion may be formed by subjecting a tip surface of at least one of the plurality of fins to a chemical conversion treatment or by irradiating the tip surface with a laser.

[0014] The above-mentioned method for manufacturing a cold plate may include a step of forming a second roughened portion on a peripheral portion of the metal plate surrounding the multiple fins, and a step of heat-fusing the second roughened portion and the resin cover.

[0015] In the above method for manufacturing a cold plate, the step of heat-sealing the roughened portion and the resin cover and the step of heat-sealing the second roughened portion and the resin cover may be carried out simultaneously. Effect of the Invention

[0016] According to the above aspect of the present invention, it is possible to provide a cold plate capable of suppressing deformation of a resin cover due to refrigerant pressure. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view of the cold plate according to the first embodiment. [Diagram 2] 2 is a cross-sectional view taken along line II-II of FIG. 1. [Diagram 3]3 is a cross-sectional view taken along line III-III in FIG. 1. [Figure 4] FIG. 4 is an enlarged view of an area A shown in FIG. [Diagram 5] FIG. 2 is a plan view of the metal plate according to the first embodiment. [Figure 6] FIG. 3 is an explanatory view showing a step of the method for manufacturing the cold plate according to the first embodiment. [Figure 7] FIG. 6 is a cross-sectional view of a cold plate according to a second embodiment. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 11 is a plan view of a cold plate according to a third embodiment. [Figure 10] 10 is a cross-sectional view taken along the line XX in FIG. 9. [Figure 11] 10 is a cross-sectional view taken along line XI-XI of FIG. 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] (First embodiment) Fig. 1 is a plan view of a cold plate 1 according to a first embodiment. Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. Fig. 4 is an enlarged view of region A in Fig. 3. As shown in these figures, the cold plate 1 includes a metal plate 10 on which a plurality of fins 11 are formed, and a resin cover 20 that covers the plurality of fins 11.

[0020] The metal plate 10 is made of a metal with good thermal conductivity, such as copper, a copper alloy, aluminum, or an aluminum alloy. As shown in Fig. 3, a plurality of fins 11 are formed on one plate surface 10a of the metal plate 10. The plurality of fins 11 are formed in parallel at regular intervals on the plate surface 10a. The other plate surface 10b of the metal plate 10 is a flat surface. Heat-generating components (not shown) come into contact with the plate surface 10b.

[0021] The fins 11 are formed in a plate shape that stands perpendicular to the plate surface 10a. The tip surface 11a, which is the upper end of the fin 11, extends parallel to the plate surface 10a as shown in Fig. 2. The side end surfaces 11b, which are both ends in the longitudinal direction of the fin 11, extend perpendicular to the plate surface 10a. The tip surface 11a and the side end surfaces 11b are connected by an inclined surface 11c. The inclined surface 11c is disposed opposite the refrigerant distribution passage 4 and the refrigerant recovery passage 5, which will be described later.

[0022] The resin cover 20 is made of a lightweight and inexpensive resin, such as polyphenylene sulfide (PPS), nylon, polypropylene, polybutylene terephthalate, polycarbonate, ABS resin, etc. The resin cover 20 is formed in a cylindrical shape with a top (also called a bowl shape). The resin cover 20 includes a top wall portion 22 and a peripheral wall portion 23 connected to the outer periphery of the top wall portion 22.

[0023] As shown in Fig. 1, the top wall portion 22 is formed in a rectangular shape in a plan view. The peripheral wall portion 23 is formed in a rectangular tubular shape (also called a square tubular shape). A flange portion 24 (also called a brim portion) that extends outward is formed at the open end (lower end) of the peripheral wall portion 23. Note that, in the plan view shown in Fig. 1, the outer shape of the flange portion 24 (resin cover 20) is the same as the outer shape of the metal plate 10, but the metal plate 10 may be larger.

[0024] An inlet side manifold 25 to which the refrigerant inlet pipe 2 is connected, and an outlet side manifold 26 to which the refrigerant outlet pipe 3 is connected are formed on the top wall portion 22. The inlet side manifold 25 protrudes upward from an upper surface 22a of the top wall portion 22, as shown in Fig. 2. A refrigerant distribution flow path 4 communicating with a space on one end side of the multiple fins 11 is formed inside the inlet side manifold 25. The refrigerant distribution flow path 4 extends in a direction perpendicular to the multiple fins 11 in a plan view.

[0025] Similar to the inlet-side manifold 25, the outlet-side manifold 26 also protrudes upward from the upper surface 22a of the top wall portion 22. A refrigerant recovery passage 5 that communicates with the space on the other end side of the multiple fins 11 is formed inside the outlet-side manifold 26. The refrigerant recovery passage 5 extends in a direction perpendicular to the multiple fins 11 in a plan view.

[0026] The refrigerant flowing in from the refrigerant inlet pipe 2 flows through the refrigerant distribution flow passage 4, the gaps (slits) between the multiple fins 11, and the refrigerant recovery flow passage 5, and then flows out from the refrigerant outlet pipe 3. The cold plate 1 of this embodiment has an inlet side manifold 25 (refrigerant distribution flow path 4) and an outlet side manifold 26 (refrigerant recovery flow path 5) at a height equal to or higher than the top wall portion 22 of the resin cover 20, making it easier to downsize in the planar direction along the plate surface 10a of the metal plate 10 than in the conventional case.

[0027] The fins 11 extend immediately below the refrigerant distribution passage 4 and the refrigerant recovery passage 5 to the vicinity of the peripheral wall portion 23. The fins 11 have inclined surfaces 11c so as not to narrow the outlet of the refrigerant distribution passage 4 and the inlet of the refrigerant recovery passage 5.

[0028] As shown in Fig. 3, tip surfaces 11a of the multiple fins 11 are fused to the underside 22b of the top wall portion 22 of the resin cover 20. To explain the principle of fusion between the fins 11 and the resin cover 20, as shown in Fig. 4, the tip surfaces 11a of the fins 11 that contact the resin cover 20 are formed with roughened portions 30 by surface treatment. The roughened portions 30 are provided with multiple micropores 31.

[0029] The resin cover 20 is pressed against the tip surface 11a of the fin 11 roughened in this way, and is heated and pressed. Then, a part of the resin cover 20 softens or melts, enters the micropores 31, and then solidifies. As a result, the resin that has entered the micropores 31 becomes an anchor, and the fin 11 and the resin cover 20 are joined together.

[0030] Returning to FIG. 2, the resin cover 20 is fused to the peripheral edge 12 of the metal plate 10 such that the open end of the peripheral wall portion 23 faces the plate surface 10a of the metal plate 10. The peripheral edge 12 of the metal plate 10 is formed with a roughened surface portion 30 (hereinafter also referred to as a second roughened surface portion 30B) similar to the roughened surface portion 30 (hereinafter also referred to as a first roughened surface portion 30A) on the tip surface 11a of the fin 11. The peripheral edge 12 of the metal plate 10 is also joined to the resin cover 20 by the same fusion principle as in FIG.

[0031] FIG. 5 is a plan view of the metal plate 10 according to the first embodiment. As shown in FIG. 5, the metal plate 10 has a first roughened portion 30A formed on the tip surfaces 11a of the multiple fins 11 and a second roughened portion 30B formed on the peripheral portion 12 of the metal plate 10 surrounding the multiple fins 11.

[0032] The roughened portion 30 can be formed by chemical conversion treatment such as etching the metal plate 10, or by laser irradiation. The first roughened portion 30A and the second roughened portion 30B may be formed simultaneously or in the same process by the above-mentioned treatment. However, in the case of chemical conversion treatment, it is necessary to mask the parts that are not to be roughened. In addition, in the case of laser irradiation, it takes time to scan with the laser for a large area such as the peripheral portion 12 of the metal plate 10. For this reason, the following manufacturing method may be adopted.

[0033] FIG. 6 is an explanatory diagram showing one step of the manufacturing method of the cold plate 1 according to the first embodiment. The manufacturing method of the cold plate 1 generally includes a step of forming the roughened portion 30 on the metal plate 10 (the fins 11 and the peripheral portion 12) and a step of heat-sealing the roughened portion 30 and the resin cover 20. Fig. 6 shows the step of forming the roughened portion 30 on the metal plate 10.

[0034] In this process, first, the roughened surface portion 30 is formed by chemical conversion treatment in a state where the shaved portion 110 for cutting out the multiple fins 11 is formed on the metal plate 10. The shaved portion 110 is cut out from the base material forming the metal plate 10, and is formed together with the plate surface 10a and the like by machining. A second roughened surface portion 30B is formed on the peripheral portion 12 of the metal plate 10 by roughening one surface on the plate surface 10a side including the shaved portion 110 by chemical conversion treatment.

[0035] Next, the shaved portion 110 is cut to form a plurality of fins 11. The plurality of fins 11 can be formed, for example, by cutting the shaved portion 110 with a rotating metal saw. For example, the metal saw forms one recess in the shaved portion 110, then rises and shifts by a predetermined width, and then descends again to form a recess adjacent to the recess. By repeating this operation, a plurality of fins 11 are formed. Note that the roughened portion 30 on the surface of the shaved portion 110 is removed by this cutting.

[0036] Next, the tip surfaces 11a of the multiple fins 11 are roughened by irradiation with a laser L. The first roughened portion 30A can be formed, for example, by scanning the laser L along the tip surface 11a of the fin 11 using a laser irradiation device 200. For example, the laser irradiation device 200 forms the first roughened portion 30A on one of the multiple fins 11, and then shifts the laser L by a predetermined width and scans the tip surface 11a of the fin 11 adjacent to the fin 11 to form the first roughened portion 30A. By repeating this operation, the first roughened portion 30A is selectively formed on the tip surfaces 11a of the multiple fins 11.

[0037] Once the roughened portion 30 has been formed on the metal plate 10 (the fins 11 and the peripheral portion 12) in this manner, the resin cover 20 is placed over the metal plate 10, and the roughened portion 30 and the resin cover 20 are heat-fused together. It is advisable to apply pressure when heat-fusing the resin cover 20 to the roughened portion 30 of the metal plate 10. In this manner, the cold plate 1 can be manufactured. According to the above-described method, instead of laser irradiation, which takes a long time to roughen a large area, a second roughened portion 30B can be formed on the peripheral portion 12 of the metal plate 10 by chemical conversion treatment, and instead of chemical conversion treatment, which requires a fine mask, a first roughened portion 30A can be selectively formed on the tip surfaces 11a of multiple fins 11 by laser irradiation.

[0038] Incidentally, in the cold plate 1 having the above configuration, it is preferable that there are many fins 11 in order to increase the heat exchange area with the refrigerant, and therefore the width of the gaps between the fins 11 becomes narrow, and the flow resistance becomes large. In order to overcome the flow resistance and flow at a sufficient speed, the refrigerant is supplied to the inside of the resin cover 20 at a relatively high pressure. Therefore, the pressure inside the resin cover 20 becomes high.

[0039] In this embodiment, the fins 11 and the resin cover 20 are firmly fused together by the first roughened portion 30A formed on the tip surface 11a of the fins 11 of the metal plate 10. The fins 11 suppress deformation of the resin cover 20 at approximately the center of the resin cover 20. This suppresses deformation such as expansion of the resin cover 20 due to the pressure of the refrigerant (for example, deformation such that the top wall portion 22 expands into a dome shape), thereby preventing cracks from occurring in the resin cover 20.

[0040] As described above, the cold plate 1 of this embodiment includes a metal plate 10 having a plurality of fins 11 formed thereon, and a resin cover 20 covering the plurality of fins 11, and a roughened portion 30 (first roughened portion 30A) is formed on the tip surface 11a of at least one of the plurality of fins 11, and the roughened portion 30 and the resin cover 20 are fused together, thereby suppressing deformation of the resin cover 20 due to the pressure of the refrigerant.

[0041] Furthermore, in the cold plate 1 of this embodiment, a second roughened portion 30B is formed on the peripheral portion 12 of the metal plate 10 surrounding the multiple fins 11, and the second roughened portion 30B is fused to the resin cover 20. This configuration increases the bonding strength between the peripheral portion 12 of the metal plate 10 and the resin cover 20, and improves sealing performance.

[0042] Furthermore, the manufacturing method of the cold plate 1 of the present embodiment described above includes a step of forming the roughened portion 30 (first roughened portion 30A) on the tip surface 11a of at least one of the fins 11 and a step of heat-fusing the roughened portion 30 and the resin cover 20, so that the fins 11 of the metal plate 10 can be firmly fused to the resin cover 20. The fins 11 suppress deformation of the resin cover 20 from inside the peripheral portion of the resin cover 20, so that the resin cover 20 can be prevented from being deformed, such as by swelling, due to the pressure of the refrigerant.

[0043] In addition, in the manufacturing method of the cold plate 1 of this embodiment, the roughened portion 30 is formed by chemical conversion treatment or laser irradiation on the tip surface 11a of at least one of the multiple fins 11. According to this method, the roughened portion 30 can be easily formed.

[0044] The manufacturing method of the cold plate 1 of this embodiment includes a step of forming the second roughened portion 30B on the peripheral portion 12 of the metal plate 10 surrounding the multiple fins 11, and a step of heat fusing the second roughened portion 30B to the resin cover 20. This method increases the bonding strength between the peripheral portion 12 of the metal plate 10 and the resin cover 20, and improves sealing performance.

[0045] In addition, in the manufacturing method of cold plate 1 of the present embodiment, a step of heat-fusing first roughened portion 30A to resin cover 20 and a step of heat-fusing second roughened portion 30B to resin cover 20 are simultaneously performed. According to this method, cold plate 1 can be manufactured efficiently.

[0046] Second embodiment Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiment are given the same reference numerals, and the description thereof will be simplified or omitted.

[0047] Fig. 7 is a cross-sectional view of the cold plate 1 according to the second embodiment. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. As shown in FIG. 8, the resin cover 20 of the second embodiment includes a lower surface 22b of the top wall portion 22 having a recessed portion 27a and a protruding portion 27b.

[0048] The tips of the multiple fins 11 are inserted into the recesses 27a. The tip of the fin 11 refers to a portion including the tip surface 11a and both side surfaces in the vicinity of the tip surface 11a. The protrusions 27b are formed between the recesses 27a. The protrusions 27b are inserted into the gaps between the fins 11.

[0049] 7, the protrusion 27b is curved in a convex shape toward the plate surface 10a of the metal plate 10 along the longitudinal direction in which the fin 11 extends. Specifically, the protrusion 27b has a streamlined tip surface 27b1 that is closest to the plate surface 10a at a middle position P in the longitudinal direction of the fin 11 and gradually moves away from the plate surface 10a as it moves away from the middle position P on both sides in the longitudinal direction.

[0050] 8, the resin cover 20 is formed with a plurality of recesses 27a into which the tips of the fins 11 are inserted, and therefore, in addition to the fusion between the fins 11 and the resin cover 20, the fins 11 and the resin cover 20 (recesses 27a) are fitted together, improving the joining strength and reliably suppressing deformation such as bulging of the resin cover 20. Furthermore, the presence of the recesses 27a into which the fins 11 are inserted facilitates the alignment of the metal plate 10 and the resin cover 20, facilitating joining.

[0051] According to the second embodiment, the resin cover 20 has a plurality of protrusions 27b between the plurality of recesses 27a, the protrusions 27b being inserted into the gaps between the plurality of fins 11, and as shown in Fig. 7, the tip surfaces 27b1 of the plurality of protrusions 27b are curved in a convex shape toward the metal plate 10 along the longitudinal direction in which the plurality of fins 11 extend. According to this configuration, the flow rate of the coolant increases in the central portion in the longitudinal direction of the fins 11, so that the bottom plate side of the metal plate 10 on which the heat-generating components are arranged can be forcibly cooled.

[0052] Third embodiment Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiment are given the same reference numerals, and the description thereof will be simplified or omitted.

[0053] Fig. 9 is a plan view of a cold plate 1 according to a third embodiment. In Fig. 9, the resin cover 20 is indicated by a two-dot chain line to make it easier to visually confirm the flow of the refrigerant. Fig. 10 is a cross-sectional view taken along the line XX in Fig. 9. Fig. 11 is a cross-sectional view taken along the line XI-XI in Fig. 9. As shown in FIG. 10, in the cold plate 1 of the third embodiment, a second protrusion 28 protruding toward the metal plate 10 is formed on the resin cover 20, and a second recess 11d that engages with the second protrusion 28 is formed on the tip of at least one of the multiple fins 11.

[0054] The refrigerant distribution passage 4 and the refrigerant recovery passage 5 of the third embodiment are formed in the center in the longitudinal direction in which the multiple fins 11 extend. As shown in Figures 9 and 11, the resin cover 20 of the third embodiment includes an inlet / outlet manifold 29 that integrates an inlet side manifold 25 in which the refrigerant distribution passage 4 is formed and an outlet side manifold 26 in which the refrigerant recovery passage 5 is formed. A partition wall 29a that separates the refrigerant distribution passage 4 and the refrigerant recovery passage 5 is formed inside the inlet / outlet manifold 29.

[0055] As shown in Figure 9, the refrigerant flowing in from the refrigerant distribution flow path 4 flows from the longitudinal center of the multiple fins 11 to both longitudinal ends, flows through the gaps between both longitudinal ends of the multiple fins 11 and the resin cover 20, and is recovered from the refrigerant recovery flow path 5 located outside the formation area of ​​the multiple fins 11.

[0056] The second protrusions 28 extend along both sides of the refrigerant distribution channel 4 in a direction perpendicular to the fins 11. The second protrusions 28 protrude downward from the lower surface 22b of the top wall portion 22 of the resin cover 20, as shown in FIG. The second recess 11d has a shape corresponding to the second protrusion 28. A roughened portion 30 is also formed on the surface of the second recess 11d.

[0057] According to the third embodiment having the above-mentioned configuration, the resin cover 20 is formed with a refrigerant distribution passage 4 that communicates with the gaps between the multiple fins 11, and a second protrusion 28 that extends along the refrigerant distribution passage 4 and protrudes toward the metal plate 10, and a second recess 11d that fits into the second protrusion 28 is formed at the tip of at least one of the multiple fins 11.Therefore, in addition to the fusion between the fin 11 and the resin cover 20, the second protrusion 28 fits into the second recess 11d, thereby improving the joining strength.

[0058] Moreover, by forming the roughened portion 30 also in the second recess 11d and increasing the area of ​​the roughened portion 30, the bonding strength at the fusion portion between the fin 11 and the resin cover 20 is improved. Furthermore, since the pressure of the refrigerant is likely to increase in the refrigerant distribution flow path 4 which is the inlet of the refrigerant, by providing the second protrusion 28 along the refrigerant distribution flow path 4, the bulging deformation of the resin cover 20 can be effectively suppressed.

[0059] Furthermore, according to the third embodiment, the refrigerant distribution passage 4 is formed in the center in the longitudinal direction in which the multiple fins 11 extend, and the second convex portion 28 is also positioned approximately in the center in the longitudinal direction in which the multiple fins 11 extend, so that deformation of the top wall portion 22 of the resin cover 20 tending to bulge into a dome shape can be reliably suppressed.

[0060] Although preferred embodiments of the present invention have been described and illustrated above, it should be understood that these are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Thus, the present invention should not be considered as limited by the foregoing description, but rather by the scope of the claims.

[0061] For example, in the above embodiment, the configuration in which the roughened portion 30 is formed on the tip surface 11a of all of the multiple fins 11 has been described, but it is sufficient that the roughened portion 30 is formed on the tip surface 11a of at least one of the multiple fins 11. Furthermore, the metal plate 10 may alternately include fins 11 having the roughened portion 30 formed on the tip surface 11a and fins 11 having no roughened portion 30 formed on the tip surface 11a.

[0062] In addition, for example, in the above embodiment, the peripheral portions of the metal plate 10 and the resin cover 20 are joined by heat fusion, but by applying conventional technology, the peripheral portions of the metal plate 10 and the resin cover 20 may be joined by injection molding with resin. Also, the peripheral portions of the metal plate 10 and the resin cover 20 may be fastened and fixed by fasteners such as bolts and nuts. [Explanation of symbols]

[0063] REFERENCE SIGNS LIST 1...cold plate, 4...refrigerant distribution channel, 10...metal plate, 11...fin, 11a...tip surface, 11d...second recess, 12...periphery, 20...resin cover, 27a...recess, 27b...projection, 28...second projection, 30...roughened portion, 30A...first roughened portion, 30B...second roughened portion

Claims

1. A metal plate having a plurality of fins formed thereon; a resin cover that covers the plurality of fins, A roughened portion is formed on a tip surface of at least one of the plurality of fins, The roughened portion and the resin cover are fused to each other.

2. The cold plate according to claim 1 , wherein a second roughened portion is formed on a peripheral portion of the metal plate surrounding the plurality of fins, and the second roughened portion and the resin cover are fused together.

3. 3. The cold plate according to claim 1, wherein the resin cover has a plurality of recesses into which the tips of the fins are inserted.

4. The resin cover is formed with a plurality of protrusions between the plurality of recesses to be inserted into gaps between the plurality of fins, The cold plate according to claim 3 , wherein tip surfaces of the plurality of protrusions are curved in a convex shape toward the metal plate along a longitudinal direction in which the plurality of fins extend.

5. The resin cover has a refrigerant distribution passage communicating with gaps between the plurality of fins; a second protrusion extending along the refrigerant distribution flow path and protruding toward the metal plate is formed, 5. The cold plate according to claim 1, wherein a tip portion of at least one of the plurality of fins is formed with a second recess portion that fits with the second protrusion portion.

6. The cold plate according to claim 5 , wherein the refrigerant distribution channel is formed in a central portion in a longitudinal direction in which the plurality of fins extend.

7. A method for manufacturing a cold plate comprising: a metal plate having a plurality of fins formed thereon; and a resin cover covering the plurality of fins, forming a roughened portion on a tip surface of at least one of the plurality of fins; and heat-sealing the roughened portion and the resin cover together.

8. 8. The method for manufacturing a cold plate according to claim 7, wherein the roughened portion is formed by chemical conversion treatment or laser irradiation on the tip surface of at least one of the plurality of fins.

9. forming a second roughened portion on a peripheral portion of the metal plate surrounding the plurality of fins; 9. The method for manufacturing a cold plate according to claim 7, further comprising the step of heat-sealing the second roughened portion and the resin cover.

10. 10. The method for manufacturing a cold plate according to claim 9, wherein the step of heat-fusing the roughened portion and the resin cover and the step of heat-fusing the second roughened portion and the resin cover are performed simultaneously.

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