WO2022269965A1 - コールドプレート - Google Patents
コールドプレート Download PDFInfo
- Publication number
- WO2022269965A1 WO2022269965A1 PCT/JP2022/002209 JP2022002209W WO2022269965A1 WO 2022269965 A1 WO2022269965 A1 WO 2022269965A1 JP 2022002209 W JP2022002209 W JP 2022002209W WO 2022269965 A1 WO2022269965 A1 WO 2022269965A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recess
- resin
- base plate
- resin cover
- cold plate
- Prior art date
Links
- 239000011347 resin Substances 0.000 claims abstract description 148
- 229920005989 resin Polymers 0.000 claims abstract description 148
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 230000002093 peripheral effect Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 7
- 239000002826 coolant Substances 0.000 description 7
- 238000004381 surface treatment Methods 0.000 description 6
- 238000005530 etching Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20254—Cold plates transferring heat from heat source to coolant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures
- H05K7/20263—Heat dissipaters releasing heat from coolant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Definitions
- the present invention relates to cold plates. This application claims priority based on Japanese Patent Application No. 2021-102878 filed in Japan on June 22, 2021, the content of which is incorporated herein.
- Patent Document 1 discloses a cold plate that includes a metal base plate having a plurality of fins arranged in parallel and a metal cover that covers the plurality of fins.
- the melted resin may flow out to the inside and outside of the resin cover and form burrs. found out.
- the burrs formed on the inside of the resin cover may narrow the flow path of the coolant flowing through the cold plate, or may peel off from the resin cover and clog the flow path. In these cases, the burrs formed inside the resin cover may reduce the cooling performance of the cold plate.
- the burrs formed on the outside of the resin cover sometimes peel off from the resin cover and fall off the cold plate. In this case, the burrs formed on the outer side of the resin cover may have an adverse effect on the electronic device to which the cold plate is attached.
- the present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a cold plate that can suppress the occurrence of burrs when heat-sealing a resin cover to a base plate.
- a cold plate includes a first surface, a second surface located opposite to the first surface, and a plurality of cold plates arranged in parallel on the first surface.
- a metal base plate having fins, and a truncated cylindrical resin cover covering the plurality of fins, wherein the first surface is provided with a recess recessed toward the second surface, The resin cover is heat-sealed to the base plate on the inner surface of the recess.
- the heat-melted resin tends to accumulate in the recesses formed in the cold plate. This suppresses the resin from protruding from the concave portion, that is, the formation of burrs.
- a first roughened portion having a plurality of fine holes is formed on the inner surface of the recess, and the resin cover is thermally fused to the base plate at the first roughened portion. good too.
- the base plate may be formed with a resin pool that communicates with the space surrounded by the recess.
- the resin reservoir may be recessed from the bottom surface of the recess toward the second surface.
- the resin reservoir when viewed from the facing direction in which the base plate and the resin cover face each other, the resin reservoir may protrude outward from the recess, and the resin reservoir may open to the first surface.
- the resin reservoir may overlap the first surface when viewed from the facing direction in which the base plate and the resin cover face each other.
- the recess has a tapered structure in which the inner diameter of the recess gradually increases in the direction from the bottom surface of the recess toward the first surface, and a second roughened portion is formed on the side surface of the recess.
- a flange portion including a surface that extends outward from the resin cover and is heat-sealed to the base plate is formed so that the base plate and the resin cover are bonded together.
- a dimension of the recess in the opposing direction may be greater than a dimension of the flange in the opposing direction.
- FIG. 2 is a plan view showing a cold plate according to the first embodiment;
- FIG. FIG. 2 is a cross-sectional view along the II-II cross section shown in FIG. 1;
- FIG. 3 is an enlarged view showing a portion of FIG. 2;
- 4 is an enlarged view of area A shown in FIG. 3;
- FIG. 5 is an enlarged view showing part of a cold plate according to a second embodiment;
- FIG. 11 is an enlarged view showing part of a cold plate according to a third embodiment; It is an enlarged view showing a part of cold plate concerning a 4th embodiment.
- FIG. 11 is an enlarged view showing part of a cold plate according to a fifth embodiment;
- FIG. 11 is a plan view showing a cold plate according to a modification;
- the cold plate 1A includes a metal base plate 10 and a resin cover 20.
- the base plate 10 has a first surface 10a and a second surface 10b opposite to the first surface 10a.
- the base plate 10 has a plurality of fins 11 arranged side by side on the first surface 10a. Each of the plurality of fins 11 is formed in a plate shape.
- the shape of the resin cover 20 is a truncated cylinder.
- the resin cover 20 covers the fins 11 . Since the resin cover 20 covers the base plate 10, the cold plate 1A has a shape of a hollow container as a whole.
- the direction in which the base plate 10 and the resin cover 20 face each other is referred to as the facing direction Z.
- the facing direction Z is also the direction in which the first surface 10a and the second surface 10b of the base plate 10 are aligned.
- the facing direction Z is also the direction perpendicular to the base plate 10 .
- viewing from the opposite direction Z may be referred to as plan view.
- the facing direction Z is also referred to as the up-down direction Z.
- the vertical direction Z may or may not be parallel to the vertical direction.
- the direction from the base plate 10 toward the resin cover 20 along the facing direction Z is referred to as +Z direction or upward direction.
- the +Z direction is also the direction from the second surface 10b of the base plate 10 toward the first surface 10a.
- the orientation opposite to the +Z orientation is referred to as the -Z orientation or down.
- the direction orthogonal to the facing direction Z is called a first direction X.
- One orientation along the first direction X is referred to as the +X orientation or rightward.
- the orientation opposite to the +X orientation is referred to as the -X orientation or leftward.
- a direction orthogonal to both the opposing direction Z and the first direction X is called a second direction Y.
- One direction along the second direction Y is called the +Y direction or the far side.
- the direction opposite to the +Y direction is called the -Y direction or front side.
- the base plate 10 is desirably made of metal with good thermal conductivity.
- the first surface 10a of the base plate 10 according to this embodiment faces upward, and the second surface 10b faces downward.
- the first surface 10a is also referred to as the upper surface 10a.
- the second surface 10b is also called a heat source surface 10b.
- the plurality of fins 11 protrude upward from the first surface 10a of the base plate 10 .
- the plurality of fins 11 are arranged in parallel in the second direction Y at substantially constant intervals. "Substantially constant” also includes the case where the interval in the second direction Y can be regarded as constant if the manufacturing error is removed. Note that the intervals at which the plurality of fins 11 are arranged in parallel in the second direction Y may not be substantially constant.
- the second surface 10b is a flat surface.
- the second surface (heat source surface) 10b is in contact with a heat source (not shown) (CPU, other heat-generating components, etc.).
- the second surface 10b is in contact with a heat transfer member that transfers heat from a heat source (not shown).
- the shape of the second surface 10b is not limited to a flat surface. The shape of the second surface 10b can be appropriately changed as long as a heat source or a heat transfer member can contact the second surface 10b.
- the first surface 10a of the base plate 10 is formed with a recess 12 that is recessed toward the second surface 10b (downward).
- the concave portion 12 is formed in a substantially rectangular annular shape when viewed from the opposing direction Z, and surrounds the plurality of fins 11 (see also FIG. 1).
- the inner surface of the recess 12 includes a bottom surface 12a, an inner surface (side surface) 12b, and an outer surface (side surface) 12c.
- the inner side surface 12 b is a surface located on the inner peripheral side of the annular recess 12 .
- the inner surface 12b corresponds to the inner peripheral surface of the recess 12 formed in an annular shape.
- the outer surface 12 c is a surface positioned on the outer peripheral side of the annular recess 12 .
- the outer surface 12c corresponds to the outer peripheral surface of the recess 12 formed in an annular shape.
- polyphenylene sulfide PPS
- polyamide polypropylene
- polyethylene terephthalate polyetheretherketone
- PEEK polyetheretherketone
- POM polyacetal
- the resin cover 20 has a ceiling wall portion 21 , a peripheral wall portion 22 and a flange portion 23 .
- the ceiling wall portion 21 is formed in a substantially rectangular shape in plan view.
- the shape of the top wall portion 21 is not limited to a substantially rectangular shape, and may be substantially circular, substantially elliptical, or substantially polygonal in plan view, for example.
- substantially rectangular,” “substantially circular,” “substantially elliptical,” and “substantially polygonal” are cases where it can be regarded as a rectangular, circular, elliptical, or polygonal shape in plan view if chamfering and manufacturing errors are removed. is also included.
- the peripheral wall portion 22 extends downward from the outer peripheral edge of the ceiling wall portion 21 in a tubular shape.
- the flange portion 23 annularly extends from the lower end (open end) of the peripheral wall portion 22 toward the outside of the resin cover 20 . As shown in FIG. 3, the lower surface of the flange portion 23 is in contact with a first roughened portion 30A (described later). The lower surface of the flange portion 23 is also the surface that is heat-sealed to the base plate 10 .
- the resin cover 20 is formed with an inlet connecting portion 24 and an outlet connecting portion 25 .
- Each of the inlet connecting portion 24 and the outlet connecting portion 25 protrudes upward from the ceiling wall portion 21 .
- the resin cover 20 is formed with a supply hole 24a penetrating the ceiling wall portion 21 and the inlet connecting portion 24, and a drain hole 25a penetrating the ceiling wall portion 21 and the outlet connecting portion 25. As shown in FIG.
- Each of the supply hole 24a and the drain hole 25a communicates with the internal space S of the cold plate 1A.
- the inlet connecting portion 24 is a portion to which an inlet pipe (not shown) that supplies refrigerant is connected.
- the coolant flows into the internal space S of the cold plate 1A through the inlet connecting portion 24 and the supply holes 24a.
- the outlet connecting portion 25 is a portion to which an outlet pipe (not shown) that discharges the refrigerant is connected.
- the coolant that has passed through the internal space S is discharged to the outside of the cold plate 1A through the drain hole 25a and the outlet connecting portion 25.
- the coolant for example, water, alcohol, other well-known compounds, and the like can be used as appropriate.
- the supply hole 24a extends from the lower surface of the ceiling wall portion 21 and opens to the right side surface of the inlet connecting portion 24.
- the drain hole 25 a extends from the lower surface of the ceiling wall portion 21 and opens to the left side surface of the outlet connecting portion 25 .
- the configurations of the supply hole 24a and the drain hole 25a can be appropriately changed as long as each of the supply hole 24a and the drain hole 25a communicates with the internal space S of the cold plate 1A.
- the cold plate 1A may not have the inlet connection 24 and the outlet connection 25 .
- each of the supply hole 24a and the drain hole 25a may pass through only the ceiling wall portion 21 .
- Each of the supply hole 24 a and the drain hole 25 a may penetrate through the peripheral wall portion 22 .
- the resin cover 20 (flange portion 23) is heat-sealed to the base plate 10 on the inner surface of the recess 12 (the bottom surface 12a in this embodiment).
- the principle of fusion bonding of the resin cover 20 to the base plate 10 in this embodiment will be described below.
- a first roughened portion 30A is formed on the bottom surface 12a in contact with the flange portion 23 by suitable surface treatment to be described later.
- the first roughened portion 30A has a plurality of fine holes 30a.
- the concave portion 12 is heated and the flange portion 23 is pressed against the roughened bottom surface 12a. At this time, a part of the flange portion 23 softens or melts, enters the fine holes 30a, and then solidifies. As a result, the resin that enters the fine holes 30a and solidifies serves as an anchor, and the resin cover 20 and the base plate 10 are firmly joined.
- the bottom surface 12a (the first roughened portion 30A) was directed upward in the vertical direction during the heat-sealing operation. It is preferably done in the state.
- the surface treatment performed on the bottom surface 12a to form the first roughened portion 30A for example, chemical conversion treatment such as etching or laser irradiation can be used.
- chemical conversion treatment such as etching or laser irradiation
- a portion of the base plate 10 that is not roughened may be appropriately masked.
- chemical conversion treatment such as etching on the entire recess 12
- surface treatment may be performed not only on the bottom surface 12a but also on the inner side surface 12b and the outer side surface 12c.
- the bottom surface 12a is oxidized by the action of the laser beam, and OH groups become abundant on the surface of the first roughened portion 30A.
- the resin molecules forming the resin cover 20 are hydrogen-bonded with the OH groups located on the surface of the first roughened portion 30A, and the resin cover 20 and the base plate 10 are joined more firmly.
- the cold plate 1A is a heat dissipation module that receives heat from a heat source or a heat transfer member in contact with the second surface (heat source surface) 10b of the base plate 10 and releases the received heat to the outside.
- Refrigerant is supplied to the internal space S of the cold plate 1A through the supply holes 24a (see FIG. 2). Since the plurality of fins 11 extend along the first direction X in the internal space S of the cold plate 1A, the supplied coolant is guided along the first direction X and flows mainly rightward. At this time, the coolant absorbs heat from the heat source via the base plate 10 (especially the fins 11). The refrigerant that has absorbed heat is discharged to the outside of the cold plate 1A through the drain holes 25a. Through the above process, the cold plate 1A can receive heat from the heat source and release the received heat to the outside.
- the cold plate 1A has a resin cover 20 heat-sealed to the base plate 10 .
- the resin cover 20 heat-sealed, the melted resin may flow to the inside and outside of the resin cover 20 to form burrs.
- the burrs formed on the inside of the resin cover 20 may narrow the flow path of the coolant flowing through the cold plate, or peel off from the resin cover 20 and clog the flow path. In these cases, the burrs formed inside the resin cover 20 may reduce the cooling performance of the cold plate.
- the burrs formed on the outside of the resin cover 20 sometimes come off from the resin cover 20 and fall off the cold plate. In this case, the burrs formed on the outer side of the resin cover 20 may adversely affect the equipment to which the cold plate is attached.
- the resin cover 20 and the base plate 10 are thermally fused at the bottom surface 12a of the recess 12 formed in the base plate 10. As shown in FIG. As a result, when the resin melts from the resin cover 20 during heat fusion, the melted resin tends to accumulate inside the recess 12 . This prevents the melted resin from overflowing to the outside of the concave portion 12 . Therefore, the resin melted from the resin cover 20 is prevented from forming burrs on the inside and outside of the resin cover 20 .
- the term “flash” refers to a solidified product in which the melted resin overflows to the outside of the concave portion 12 and solidifies.
- the inner surface 12b and the outer surface 12c can be oxidized by the action of the laser light reflected (irregularly reflected) from the bottom surface 12a.
- the inner side surface 12b and the outer side surface 12c can also be oxidized by heat diffusion (heat conduction) from the bottom surface 12a heated by laser irradiation.
- heat conduction heat conduction
- the wettability of the inner side surface 12b and the outer side surface 12c can be improved by the action of the laser light irregularly reflected by the bottom surface 12a and the heat diffusion from the bottom surface 12a.
- the resin melted from the resin cover 20 is less likely to jump out of the concave portion 12 . Therefore, burr formation is suppressed.
- the cold plate 1A of the present embodiment includes a first surface 10a, a second surface 10b located opposite to the first surface 10a, and a plurality of fins 11 arranged in parallel on the first surface 10a. and a truncated cylindrical resin cover 20 covering a plurality of fins 11, and a concave portion 12 recessed toward the second surface 10b is formed on the first surface 10a.
- the resin cover 20 is heat-sealed to the base plate 10 on the inner surface of the recess 12 .
- a first roughened portion 30A having a plurality of fine holes 30a is formed on the inner surface of the recess 12, and the resin cover 20 is heat-fused to the base plate 10 at the first roughened portion 30A.
- a portion of the softened or melted resin cover 20 enters the micropores 30a and solidifies, serving as an anchor. Therefore, the joint strength between the resin cover 20 and the base plate 10 is improved.
- a resin reservoir 13 is formed in a base plate 10. As shown in FIG. Resin reservoir 13 communicates with the space surrounded by recess 12 . In other words, the resin reservoir 13 is a recess (groove) that opens into the recess 12 . In particular, the resin reservoir 13 according to the present embodiment is recessed from the bottom surface 12a of the recess 12 toward the second surface 10b (downward).
- the resin reservoir 13 may be formed, for example, by subjecting the recess 12 to etching, cutting, laser processing, or the like.
- the resin reservoir 13 may extend continuously along the concave portion 12 that is formed in an annular shape when viewed from the opposing direction Z. As shown in FIG. Alternatively, it may be intermittently formed along the recess 12 .
- the resin reservoir 13 may be formed on the inner surface 12b or the outer surface 12c. Note that the shape of the resin reservoir 13 is not limited to the example shown in FIG. As long as the resin reservoir 13 communicates with the space surrounded by the recess 12, the shape of the resin reservoir 13 can be changed as appropriate.
- the base plate 10 is formed with the resin reservoir 13 that communicates with the space surrounded by the recess 12 .
- molten resin flows from the resin cover 20 into the resin pool 13 . Therefore, it is possible to more reliably prevent the resin from protruding from the concave portion 12 and forming burrs.
- the resin reservoir 13 is recessed from the bottom surface 12a of the recess 12 toward the second surface 10b. This configuration is particularly effective when the resin cover 20 and the base plate 10 are heat-sealed with the bottom surface 12a facing upward in the vertical direction. This is because the resin melted from the resin cover 20 tends to flow into the resin pool 13 under the influence of gravity. As a result, it is more effectively suppressed that the melted resin jumps out of the concave portion 12 and forms burrs.
- the resin reservoir 13 is arranged at a position overlapping the first surface 10 a of the base plate 10 when viewed from the opposing direction Z. As shown in FIG. In other words, when viewed from the facing direction Z, the resin reservoir 13 overlaps the first surface 10a.
- the resin reservoir 13 according to the present embodiment is recessed outward in the first direction X or the second direction Y from the outer side surface 12c of the recess 12 .
- the resin reservoir 13 is formed, it is possible to obtain the same effect as the cold plate 1B according to the second embodiment.
- the resin pool 13 does not open to the first surface 10a of the base plate 10, the melted resin from the resin cover 20 is less likely to flow upward from the first surface 10a. Thereby, it is possible to more effectively suppress the occurrence of burrs.
- the concave portion 12 has a tapered structure in which the inner diameter of the concave portion 12 gradually increases in the upward direction.
- the recess 12 has a tapered structure in which the inner diameter of the recess 12 gradually increases in the direction from the bottom surface 12a toward the first surface 10a.
- the inner side surface 12b of the concave portion 12 according to the present embodiment is gradually inclined inward in the first direction X or the second direction Y in the upward direction.
- the outer side surface 12c of the concave portion 12 according to the present embodiment is gradually inclined outward in the first direction X or the second direction Y in the upward direction.
- a second roughened portion 30B is formed on the inner side surface 12b and the outer side surface 12c according to the present embodiment.
- the second roughened portion 30B can be formed, for example, by irradiating the inner surface 12b and the outer surface 12c with a laser.
- the inner side surface 12b and the outer side surface 12c are inclined such that the inner diameter of the concave portion 12 gradually increases in the upward direction. Therefore, the downwardly irradiated laser beam can be directly applied to the inner surface 12b and the outer surface 12c.
- first roughened portion 30A and the second roughened portion 30B are formed by laser irradiation
- the formation of the first roughened portion 30A and the formation of the second roughened portion 30B are the same. may be performed by a laser irradiation machine.
- the second roughened portion 30B formed on the inner side surface 12b and the outer side surface 12c has a plurality of fine holes 30a, like the first roughened portion 30A. Furthermore, when the second roughened portion 30B is formed by laser irradiation, the inner surface 12b and the outer surface 12c are oxidized by the action of the laser beam, and OH groups are formed on the surface of the second roughened portion 30B. can be enriched. That is, the resin molecules melted from the resin cover 20 are easily adsorbed to the second roughened portion 30B. In other words, the action of the laser light improves the wettability of the second roughened portion 30B. This makes it more difficult for the resin melted out of the resin cover 20 to jump out of the concave portion 12 . Therefore, burr formation is further suppressed.
- the shapes of the inner side surface 12b and the outer side surface 12c are not limited to the example shown in FIG.
- the shape of the inner side surface 12b and the outer side surface 12c can be appropriately changed as long as the concave portion 12 has a tapered structure in which the inner diameter gradually increases in the upward direction.
- one of the inner side surface 12b and the outer side surface 12c may be inclined with respect to the facing direction Z, and the other of the inner side surface 12b and the outer side surface 12c may be formed parallel to the facing direction Z.
- the configuration of the second roughened portion 30B is not limited to the example in FIG.
- the second roughened portion 30B may be formed only on the inner surface 12b or may be formed only on the outer surface 12c.
- the second roughened portion 30B may be formed only on part of the inner surface 12b or the outer surface 12c, or may be formed over the entire inner surface 12b and the outer surface 12c.
- the recess 12 has a tapered structure in which the inner diameter of the recess 12 gradually increases in the direction from the bottom surface 12a of the recess 12 toward the first surface 10a.
- a second roughened portion 30B is formed on the side surface of the .
- the tapered structure of the concave portion 12 makes it easy to irradiate the inner side surface 12b or the outer side surface 12c with a laser beam. can be done. Therefore, the wettability of the inner side surface 12b and the outer side surface 12c can be improved more reliably.
- the volume of the molten resin that can be stored in the recess 12 can be increased. That is, the melted resin is suppressed from overflowing from the concave portion 12 .
- the volume of the space surrounded by the recess 12 (the volume of the recess 12 ) is larger than the volume of the flange portion 23 . Therefore, even if the entire flange portion 23 is melted, the melted resin is prevented from overflowing from the concave portion 12 .
- the first roughened portion 30A is formed and the resin cover 20 is not necessarily heat-sealed to the bottom surface 12a, but may be, for example, the inner surface 12b or the outer surface 12c.
- the resin cover 20 may not have the flange portion 23. In this case, the lower surface of the peripheral wall portion 22 may be heat-sealed to the base plate 10 .
- the resin cover 20 may be heat-sealed to the base plate 10 without forming the first roughened portion 30A on the inner surface of the recess 12 . Further, when the first roughened portion 30A is formed, the first roughened portion 30A may be formed over the entire bottom surface 12a of the recess 12, or may be formed on a part of the bottom surface 12a. may be
- each resin reservoir 13 opens to the first surface 10a of the base plate 10.
- the resin reservoir 13 can be formed by subjecting the first surface 10a to etching, cutting, laser processing, or the like.
- Each resin pool 13 protrudes outward in the first direction X or the second direction Y from the concave portion 12 when viewed from the opposing direction Z. As shown in FIG.
- the fins 11 are less likely to interfere with the formation of the resin pools 13 .
- the resin reservoir 13 protrudes outward from the concave portion 12 when viewed from the opposing direction Z, and the resin reservoir 13 opens to the first surface 10a. This configuration can reduce the difficulty of forming the resin reservoir 13 .
- a cold plate with both may be employed.
- a structure in which the dimension of the concave portion 12 in the facing direction Z shown in FIG. 8 is larger than the dimension of the flange portion 23 in the facing direction Z may be applied to the first to fourth embodiments.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
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Abstract
Description
本願は、2021年6月22日に、日本に出願された特願2021-102878号に基づき優先権を主張し、その内容をここに援用する。
以下、第1実施形態に係るコールドプレートについて図面に基づいて説明する。
図1および図2に示すように、コールドプレート1Aは、金属製のベースプレート10と、樹脂カバー20と、を備える。ベースプレート10は、第1面10aと、第1面10aとは反対側に位置する第2面10bと、を有する。ベースプレート10は、第1面10aに並列された複数のフィン11を有する。複数のフィン11の各々は、板状に形成されている。樹脂カバー20の形状は、有頂筒状である。樹脂カバー20は、複数のフィン11を覆っている。コールドプレート1Aの形状は、樹脂カバー20がベースプレート10を覆うことにより、全体として中空容器状である。
ここで本実施形態では、ベースプレート10と樹脂カバー20とが対向する方向を対向方向Zと称する。対向方向Zは、ベースプレート10の第1面10aと第2面10bとが並ぶ方向でもある。あるいは、対向方向Zは、ベースプレート10に垂直な方向でもある。本明細書において、対向方向Zから見ることを、平面視と称する場合がある。対向方向Zは、上下方向Zとも称される。ただし、上下方向Zは、鉛直方向と平行であってもよいし、平行でなくてもよい。対向方向Zに沿って、ベースプレート10から樹脂カバー20に向かう向きを、+Zの向きまたは上方と称する。+Zの向きは、ベースプレート10の第2面10bから第1面10aに向かう向きでもある。+Zの向きとは反対の向きを、-Zの向きまたは下方と称する。複数のフィン11の各々が延在する方向のうち、対向方向Zに直交する方向を第1方向Xと称する。第1方向Xに沿う一つの向きを、+Xの向きまたは右方と称する。+Xの向きとは反対の向きを、-Xの向きまたは左方と称する。対向方向Zおよび第1方向Xの双方に直交する方向を第2方向Yと称する。第2方向Yに沿う一つの向きを、+Yの向きまたは奥側と称する。+Yの向きとは反対の向きを、-Yの向きまたは手前側と称する。
コールドプレート1Aの内部空間Sには、供給孔24aを通じて冷媒が供給される(図2参照)。コールドプレート1Aの内部空間Sにおいて複数のフィン11が第1方向Xに沿って延びているため、供給された冷媒は、第1方向Xに沿ってガイドされ、主として右方に向けて流動する。このとき、冷媒は、ベースプレート10(特にフィン11)を介して熱源から熱を吸収する。熱を吸収した冷媒は、排水孔25aを通じてコールドプレート1Aの外部へと排出される。上記のプロセスにより、コールドプレート1Aは、熱源から熱を受け取り、受け取った熱を外部に放出することができる。
次に、本発明の第2実施形態について説明するが、第1実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。
図5に示すコールドプレート1Bにおいて、ベースプレート10には樹脂だまり13が形成されている。樹脂だまり13は、凹部12によって囲まれる空間に連通している。言い換えれば、樹脂だまり13は、凹部12に開口する窪み(溝)である。特に本実施形態に係る樹脂だまり13は、凹部12の底面12aから第2面10b(下方)に向けて窪んでいる。
次に、本発明の第3実施形態について説明するが、第2実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。
図6に示すコールドプレート1Cにおいて、樹脂だまり13は、対向方向Zから見て、ベースプレート10の第1面10aと重なる位置に配置されている。言い換えれば、対向方向Zから見て、樹脂だまり13は、第1面10aと重なっている。本実施形態に係る樹脂だまり13は、凹部12の外側面12cから第1方向Xまたは第2方向Yにおける外側に向けて窪んでいる。
次に、本発明の第4実施形態について説明するが、第1実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。
次に、本発明の第5実施形態について説明するが、第1実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。
図8に示すコールドプレート1Eにおいて、対向方向Zにおける凹部12の寸法は、対向方向Zにおけるフランジ部23の寸法よりも大きい。
図8に示す対向方向Zにおける凹部12の寸法が対向方向Zにおけるフランジ部23の寸法より大きい構造を、第1~第4実施形態に適用してもよい。
Claims (8)
- 第1面と、前記第1面とは反対側に位置する第2面と、前記第1面に並列された複数のフィンと、を有する金属製のベースプレートと、
前記複数のフィンを覆う有頂筒状の樹脂カバーと、を備え、
前記第1面には、前記第2面に向けて窪む凹部が形成され、
前記凹部の内面において、前記樹脂カバーが前記ベースプレートに対して加熱融着されている、コールドプレート。 - 前記凹部の内面には、複数の微細孔を有する第1粗面化部が形成され、
前記樹脂カバーは、前記第1粗面化部において前記ベースプレートに対して加熱融着されている、請求項1に記載のコールドプレート。 - 前記ベースプレートには、前記凹部によって囲まれる空間に連通する樹脂だまりが形成されている、請求項1または2に記載のコールドプレート。
- 前記樹脂だまりは、前記凹部の底面から前記第2面に向けて窪んでいる、請求項3に記載のコールドプレート。
- 前記ベースプレートと前記樹脂カバーとが対向する対向方向から見て、前記樹脂だまりは前記凹部から外側に突出しており、
前記樹脂だまりは前記第1面に開口している、請求項3に記載のコールドプレート。 - 前記ベースプレートと前記樹脂カバーとが対向する対向方向から見て、前記樹脂だまりは、前記第1面と重なっている、請求項3に記載のコールドプレート。
- 前記凹部は、前記凹部の底面から前記第1面に向かう向きにおいて漸次前記凹部の内径が大きくなるテーパ構造を有し、
前記凹部の側面には、第2粗面化部が形成されている、請求項1から6のいずれか一項に記載のコールドプレート。 - 前記樹脂カバーの開口端部には、前記樹脂カバーの外側に向けて延びるとともに、前記ベースプレートに対して加熱融着される面を含むフランジ部が形成され、
前記ベースプレートと前記樹脂カバーとが対向する対向方向における前記凹部の寸法は、前記対向方向における前記フランジ部の寸法よりも大きい、請求項1から7のいずれか一項に記載のコールドプレート。
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JP2017022374A (ja) * | 2015-07-08 | 2017-01-26 | 株式会社フジクラ | コールドプレートおよびその製造方法 |
JP2018081997A (ja) * | 2016-11-15 | 2018-05-24 | 株式会社フジクラ | コールドプレート |
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