Bendable vapor chamber

Abstract

The bendable vapor chamber comprises a shell, a one-dimensional liquid absorption core and a two-dimensional liquid absorption core, the shell comprises a supporting plate and a light plate, and the edge of the supporting plate and the edge of the light plate are connected in a sealed mode to form the shell with a cavity; a bending area is arranged in the middle of the shell and divides the cavity into an evaporation area and a condensation area. At least one area of the light plate is provided with a plurality of first supporting columns abutting against the supporting plate, the one-dimensional wick is sintered on the inner side of the light plate and avoids the area where the first supporting columns are arranged to form a first steam channel, and the first steam channel at least penetrates through the bending area and the condensation area; the plurality of two-dimensional liquid absorbing cores are arranged on the one-dimensional liquid absorbing core, and each two-dimensional liquid absorbing core extends from the evaporation area to the condensation area; second supporting columns abutting against the one-dimensional wick are arranged on the supporting plate, and a second steam channel is formed between the second supporting columns. The utility model can effectively solve the problem of blocking of the steam channel in the bending area.

Description

Technical Field

[0001] The utility model relates to the field of phase change vapor chambers, in particular to a bendable vapor chamber. Background Art

[0002] The vapor chamber is the core heat transfer component for achieving efficient heat dissipation in different scenarios. Different application scenarios place customized requirements on the two-dimensional and three-dimensional shapes of the vapor chamber. For example, in scenarios where the cold and heat sources are on different surfaces, the vapor chamber needs to be bent. For gaseous working fluids, solving the collapse problem in the bent area of ​​the vapor chamber can effectively reduce the transmission resistance of the gaseous working fluid. However, due to the influence of gravity, the return speed of the liquid working fluid in different areas is significantly different. The difference in return speed will cause the blockage of the steam channel in the bent area, and eventually lead to "reversible" failure of the heterogeneous vapor chamber, which will seriously affect the thermal conductivity of the bent vapor chamber and reduce the heat dissipation effect. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model proposes a bendable heat spreader, which can effectively solve the blockage problem of the steam channel in the bending area, effectively improve the liquid transmission capacity of the heat spreader, and thus solve the performance degradation and "reversible" failure problem of the heat spreader caused by bending.

[0004] The technical solution of the present utility model is achieved as follows:

[0005] On the one hand, the utility model provides a bendable heat spreader, comprising a shell, a one-dimensional liquid absorbent core and a two-dimensional liquid absorbent core, the shell comprising a support plate and a light plate, the support plate being sealed and connected to the edge of the light plate to form a shell having a cavity; a bending area is provided in the middle of the shell, and the bending area divides the cavity into an evaporation area and a condensation area; at least one area of ​​the light plate is provided with a plurality of first support columns abutting against the support plate, the one-dimensional liquid absorbent core is sintered on the inner side of the light plate and avoids the area where the first support columns are provided to form a first steam channel, and the first steam channel at least passes through the bending area and the condensation area; a plurality of two-dimensional liquid absorbent cores are provided on the one-dimensional liquid absorbent core and each of the two-dimensional liquid absorbent cores extends from the evaporation area to the condensation area; a second support column abutting against the one-dimensional liquid absorbent core is provided on the support plate, and a second steam channel is formed between the second support columns.

[0006] Preferably, the first steam channel includes a first steam sub-channel, and the first steam sub-channel is arranged around the edge of the light plate.

[0007] Preferably, the first steam channel further includes a second steam sub-channel, which is respectively arranged between two adjacent two-dimensional liquid-absorbing cores; the second steam sub-channel at least passes through the bending area and the condensation area, and directly connects to the first steam sub-channel in the condensation area.

[0008] Preferably, the first steam channel includes a first steam sub-channel and a second steam sub-channel, the first steam sub-channel is arranged at the edge of the condensation area on the light plate, and the second steam sub-channel is arranged between two adjacent two-dimensional liquid-absorbing cores; the second steam sub-channel at least passes through the bending area and the condensation area, and directly leads to the first steam sub-channel.

[0009] Preferably, the tops of the support plate and the light plate are provided with liquid injection ports, and guide structures for guiding the discharge of non-condensable gas are provided on both sides of the liquid injection ports.

[0010] Preferably, the guiding structure is a beveled frame provided on both sides of the liquid injection port, and the angle formed between the two beveled frames in the cavity is less than 180°.

[0011] Preferably, a groove is provided on the support plate at a position corresponding to the two-dimensional liquid absorbent core, no second support column is provided in the groove, and the two-dimensional liquid absorbent core is in contact with the groove.

[0012] Preferably, the bending area of ​​the support plate is provided with bending structures equidistantly distributed along the width direction of the support plate, and the bending structure includes support blocks equidistantly distributed along the length direction of the support plate.

[0013] Preferably, long support strips are respectively provided at both ends of the bending structure on the support plate.

[0014] Compared with the prior art, the present invention has the following advantages: the bendable heat spreader provided by the present invention is provided with a plurality of first support columns abutting against the support plate in at least one area of ​​the light plate, a one-dimensional liquid absorbent core is sintered on the inner side of the light plate and avoids the area where the first support columns are provided to form a first steam channel, wherein the first steam channel at least passes through the bending area and the condensation area; and a plurality of two-dimensional liquid absorbent cores are provided on the one-dimensional liquid absorbent core and each of the two-dimensional liquid absorbent cores extends from the evaporation area to the condensation area, a second support column abutting against the one-dimensional liquid absorbent core is provided on the support plate, and a second steam channel is formed between the second support columns; after the top working medium absorbs heat and vaporizes, it is mainly transmitted to the condensation area through the second steam channel, and when the steam is transmitted to the vicinity of the cold source of the heat spreader, it will simultaneously pass through the first steam channel and the second steam channel The second steam channel transmits to the condensation area. Therefore, when liquid working medium accumulates on the bend area of ​​the heat spreader and blocks the second steam channel, a liquid film cannot be formed because there is no liquid wick structure in the area of ​​the first steam channel, thereby ensuring that the first steam channel will not be blocked, thereby solving the blockage problem of the steam channel in the bend area. Moreover, when steam is transmitted to the bend area of ​​the heat spreader through the first steam channel, the steam pressure generated by the circulating steam in the first steam channel will push the liquid working medium of the cold source toward the heat source, thereby realizing the liquid working medium to flow back to the evaporation area under the combined action of capillary force and steam pressure, instead of the traditional heat spreader relying solely on the capillary force of the liquid wick to achieve working medium reflux. This can effectively improve the liquid transmission capacity of the heat spreader, thereby solving the performance degradation and "reversible" failure problem of the heat spreader caused by bending. The utility model can effectively reduce the degradation of the heat spreader performance caused by bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a schematic diagram of a partial cross-sectional structure of one embodiment of the bendable vapor chamber of the present invention;

[0017] Figure 2 This is a schematic diagram of a light panel and two-phase flow transmission in one embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the internal structure of the support plate of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the bendable soaking plate of the utility model after bending;

[0020] Figure 5 This is a schematic diagram of the internal structure of a light panel in another embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the internal structure of a light panel in another embodiment of the present invention;

[0022] Figure 7 This is a structural diagram of the assembly process of the bendable heat sink of the utility model.

[0023] Figure identification: 1. Shell; 101. Support plate; 1011. Second support column; 1012. Channel; 1013. Long support bar; 102. Light plate; 1021. First support column; 103. Cavity; 104. Bending area; 1041. Bending structure; 10411. Support block; 105. Evaporation area; 106. Condensation area; 2. One-dimensional wick; 3. Two-dimensional wick; 4. First steam channel; 401. First steam sub-channel; 402. Second steam sub-channel; 5. Second steam channel; 6. Liquid injection port; 7. Guide structure. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] See also Figures 1-6 The present invention discloses a bendable vapor chamber, comprising a shell 1, a one-dimensional liquid wick 2, and a two-dimensional liquid wick 3. The shell 1 comprises a support plate 101 and a light plate 102. The support plate 101 and the light plate 102 are sealedly connected at their edges to form a shell 1 having a cavity 103. A bending area 104 is provided in the middle of the shell 1. The bending area 104 divides the cavity 103 into an evaporation area 105 and a condensation area 106. At least one area of ​​the light plate 102 is provided with a plurality of first support columns 1021 abutting against the support plate 101. The one-dimensional wick 2 is sintered on the inner side of the light plate 102 and avoids the area where the first support column 1021 is provided to form a first steam channel 4, and the first steam channel 4 at least passes through the bending area 104 and the condensation area 106; multiple two-dimensional wicks 3 are provided on the one-dimensional wick 2 and each of the two-dimensional wicks 3 extends from the evaporation area 105 to the condensation area 106; the support plate 101 is provided with a second support column 1011 abutting against the one-dimensional wick 2, and a second steam channel 5 is formed between the second support columns 1011.

[0028] It should be noted that the heat spreader needs to be bent for different scenarios; and for the bent heat spreader, due to the influence of gravity, the return rate of the liquid working medium in different areas of the bent heat spreader (evaporation area 105, condensation area 106 and bending area 104) is significantly different, and the difference in return rate can easily cause blockage of the steam channel in the bending area 104; in the existing related designs, since the liquid wick is generally spread over the entire plane sintered on the light plate 102, when the steam is transmitted from top to bottom and gradually approaches the cold source, the liquid working medium in the bending area gradually increases under the action of gravity, and due to the liquid wick structure laid in the bending area, the liquid working medium will form a liquid film in the entire area of ​​the bending area, which will cause the steam channel in the bending area to be easily blocked, and even cause the anisotropic heat spreader to fail "reversibly", which will seriously affect the thermal conductivity of the bent heat spreader.

[0029] It can be understood that the embodiment of the present invention provides a plurality of first support columns 1021 abutting against the support plate 101 in at least one area of ​​the light plate 102, and the one-dimensional liquid absorbent core 2 is sintered on the inner side of the light plate 102 and avoids the area where the first support columns 1021 are provided to form a first steam channel 4, wherein the first steam channel 4 at least passes through the bending area 104 and the condensation area 106; and a plurality of two-dimensional liquid absorbent cores 3 are provided on the one-dimensional liquid absorbent core 2 and each of the two-dimensional liquid absorbent cores 3 extends from the evaporation area 105 to the condensation area 106, and the support plate 101 is provided with a second support column 1011 abutting against the one-dimensional liquid absorbent core 2, and a second steam channel 5 is formed between the second support columns 1011; after the top working fluid absorbs heat and vaporizes, it is mainly transmitted to the condensation area 106 by the second steam channel 5, and when the steam is transmitted to the vicinity of the cold source of the heat spreader, it will simultaneously pass through the first steam channel The first steam channel 4 and the second steam channel 5 are transmitted to the condensation area 106. Therefore, when liquid working medium accumulates on the bending area 104 of the heat spreader and will block the second steam channel 5, no liquid film can be formed because there is no one-dimensional liquid wick 2 structure in the area of ​​the first steam channel 4, thereby ensuring that the first steam channel 4 will not be blocked, thereby solving the blockage problem of the steam channel in the bending area 104; and in this embodiment, when steam is transmitted to the bending area of ​​the heat spreader through the first steam channel 4, the steam pressure generated by the circulating steam in the first steam channel 4 will push the liquid working medium of the cold source to move toward the heat source, thereby realizing the liquid working medium to flow back to the evaporation area 105 under the combined action of capillary force and vapor pressure, instead of the existing heat spreader relying only on the capillary force of the liquid wick to realize the working medium reflux, thereby effectively improving the liquid transmission capacity of the heat spreader, thereby solving the performance degradation and "reversible" failure problem of the heat spreader due to bending.

[0030] In this embodiment, the one-dimensional wick 2 and the two-dimensional wick 3 are both made of copper-based materials; wherein, the one-dimensional wick 2 is specifically a copper wire mesh, and the two-dimensional wick is specifically a copper 3D spiral woven belt. In this embodiment, it can be understood that the two-dimensional wick 3 can provide a fast channel for the reflux of the working medium. The liquid working medium that flows back to the evaporation zone 105 through the two-dimensional wick 3 is diffused by the one-dimensional wick 2 and evaporates on the one-dimensional wick 2, thereby accelerating the transfer of the working medium, thereby greatly improving the heat dissipation efficiency of the bent heat spreader. Of course, the one-dimensional wick 2 and the two-dimensional wick 3 in this embodiment can also be replaced by other wick structures that also have the ability to transfer working medium, such as grooved wicks, fiber felt wicks, etc., and their materials can also be replaced with base materials such as aluminum and stainless steel. The embodiments of the utility model are not limited here.

[0031] The support plate 101 and the light plate 102 can be made of copper, copper alloy, aluminum, aluminum alloy, stainless steel, or other metals or metal alloys. In other words, the housing 1 can be made of one of the aforementioned materials. Furthermore, the outer surface of the housing 1 can be subjected to an insulating spray coating or electroplating treatment. For example, when stainless steel is used, the outer surface of the stainless steel can be copper-plated. The working fluid can be water, or it can be replaced by a material with gas-liquid phase transition properties, such as ethanol or acetone.

[0032] Please note that Figure 1 and Figure 2 In this embodiment of the present invention, the technical solution of this application is described in detail using the first steam channel 4 as comprising a first steam sub-channel 401 and a second steam sub-channel 402. In this embodiment of the present invention, the first steam sub-channel 401 is disposed around the edge of the light plate 102; the second steam sub-channel 402 is disposed between two adjacent two-dimensional wicks 3; the second steam sub-channel 402 at least passes through the bending area 104 and the condensation area 106, and directly connects to the first steam sub-channel 401 in the condensation area 106. Among them, a first support column 1021 is provided around the outer edge of the light plate 102, and the one-dimensional liquid absorbent core 2 avoids the first support column 1021 provided around the outer edge of the light plate 102 to form a first steam sub-channel 401, and the first steam sub-channel 401 passes through the evaporation area 105, the condensation area 106 and the bending area 104 to form a loop; and the second steam sub-channel 402 is located between two adjacent two-dimensional liquid absorbent cores 3 and passes through the bending area 104 and the condensation area 106. At the same time, the second steam sub-channel 402 can be partially located at the lower end of the evaporation area 105 to push the cold source to move toward the heat source faster.

[0033] See also Figure 2 and Figure 4 , when the heat source is set at the top of the vapor chamber and the cold source is set at the bottom of the vapor chamber, that is, the heat source is set at Figure 4 As shown, a large surface is erected and the cooling source is set as Figure 4 When the bending surface or horizontal surface is shown, the top working medium absorbs heat and vaporizes and is mainly transferred to the condensation area 106 through the second steam channel 5. When the steam is transferred to the cold source near the bendable heat sink, it is simultaneously transferred to the cold source area through the second steam channel 5 and the second steam sub-channel 402; Figure 1 and Figure 2As shown, when liquid working medium accumulates on the bending area 104 and is about to block the second steam channel 5, a liquid film cannot be formed because there is no one-dimensional liquid wick 2 structure in the area of ​​the second steam sub-channel 402, thereby ensuring that the second steam sub-channel 402 will not be blocked. At this time, the steam continues to be transmitted to the condensation area 106 through the second steam sub-channel 402. At this time, the first steam sub-channel 401 and the second steam sub-channel 402 are directly connected, so that the steam can form a closed loop in the cavity 103, thereby accelerating the transmission of the working medium. Moreover, in this embodiment, when the steam is transmitted to the bending area of ​​the heat spreader through the second steam sub-channel 402 and then transmitted to the condensation area 106, the steam pressure generated by the steam will push the liquid working fluid of the cold source to move toward the heat source due to the closed loop circulation formed by the second steam sub-channel 402 and the first steam sub-channel 401, so that the liquid working fluid can reflux to the evaporation area 105 under the combined action of capillary force and steam pressure. Compared with the existing heat spreader that can only rely on the capillary force of the liquid absorption core to achieve the working fluid reflux, it can greatly improve the liquid transmission capacity of the heat spreader and effectively improve the heat dissipation efficiency of the bent heat spreader.

[0034] In this embodiment, the first steam sub-channel 401 and the second steam sub-channel 402 enable the gaseous working medium generated on the large surface of the vapor chamber to be transferred through the second steam sub-channel 402 with low resistance through the bend area 104 to the first steam sub-channel 401 in the bottom condensation area 106. At the same time, the incompletely condensed gaseous working medium can generate sufficient air pressure in the wick-free cavity 103 at the bottom edge, thereby promoting the backflow of the liquid working medium. This driving force can effectively solve the problem of insufficient transmission force of the liquid working medium in the bend section. Therefore, the first steam sub-channel 401 and the second steam sub-channel 402 of the present invention can effectively solve the problem of performance degradation of the vapor chamber at the bend.

[0035] Moreover, the utility model leaves the edge of the inner cavity of the light plate 102 empty and does not set a liquid absorption core, but sets a first support column 1021 to form a first steam sub-channel 401, which can greatly improve the overall phase change stability of the phase change heat spreader, especially improve the horizontal temperature equalization ability of the heat spreader, which has an obvious effect on the temperature difference between the positive and negative poles of the lithium battery when the bent heat spreader is used.

[0036] Furthermore, since it is not always possible to completely evacuate the cavity 103 after filling it with the working fluid, the more air mixed in the cavity 103, the more it affects the transfer of the working fluid, and thus the heat dissipation efficiency of the vapor chamber. Therefore, in the embodiment of the present invention, a liquid injection port 6 is further provided on the top of the support plate 101 and the light plate 102, and a guide structure 7 for guiding the discharge of non-condensable gas is provided on both sides of the liquid injection port 6 to enhance the secondary degassing effect of the bendable vapor chamber.

[0037] Specifically, the guide structure 7 is a beveled frame provided on both sides of the liquid injection port 6, and the angle formed between the two beveled frames in the cavity 103 is less than 180°. Figure 3 The beveled frames on the top of the shell 1 are symmetrically distributed with the liquid injection port 6 as the center, wherein the bevel angle α between the two beveled frames and the horizontal direction should be no less than 0.5°, so that the angle formed between the two beveled frames in the cavity 103 is less than 180°; since the density of the restless gas is smaller than that of water vapor, when the bendable heat spreader is placed upright, the restless gas will move to the top of the shell 1 and the restless gas will be above the water vapor. At this time, since the frames on both sides of the liquid injection port 6 are beveled frames, the restless gas can be guided to be discharged from the liquid injection port 6. In the embodiment of the present utility model, the bevel angle α between the two beveled frames and the horizontal direction should be no less than 0.5°, so that the angle formed between the two beveled frames in the cavity 103 is less than 180°, which will not occupy too much volume of the cavity 103 and can also be used for secondary degassing, thereby improving the heat dissipation of the heat spreader.

[0038] like Figure 3 As shown, a groove 1012 is provided on the support plate 101 at a position corresponding to the two-dimensional liquid absorbent core 3. No second support column 1011 is provided in the groove 1012. The two-dimensional liquid absorbent core 3 is in contact with the groove 1012 to facilitate limiting the two-dimensional liquid absorbent core 3 and also to control the flatness of the heat spreader after packaging.

[0039] like Figure 3 As shown, to reduce the collapse of the light panel 102 during bending, the bending region 104 of the support plate 101 is provided with bending structures 1041 distributed evenly along the width of the support plate 101, thereby effectively preventing the collapse of the light panel 102. The bending structures 1041 include support blocks 10411 distributed evenly along the length of the support plate 101. Specifically, the support blocks 10411 are rectangular blocks, and the bending structure 1041 is composed of densely arranged rectangular blocks, which can act as a hinge during the bending process.

[0040] Furthermore, Figure 3 As shown, to reduce the deformation and backward movement of the housing 1 caused by internal stress, long support strips 1013 are respectively provided at both ends of the bending structure 1041 on the support plate 101 to resist deformation and slippage during bending. The length of the long support strips 1013 is preferably greater than or equal to 20 mm.

[0041] The transverse width of the rectangular block should not be less than the second support column 1011 , and the total longitudinal length of the bending structure 1041 should not be less than the longitudinal length of the bending area 104 , so as to effectively prevent the bending area 104 from collapsing.

[0042] In addition to the bending structure 1041 and the long support strip 1013 , other areas of the support plate 101 are provided with second support columns 1011 to facilitate steam transmission and diffusion.

[0043] As a more preferred embodiment of the present invention, bending reinforcement areas for setting up the long support plate 101 are respectively provided on both sides of the bending area 104, wherein the area where the second steam sub-channel 402 is located at least includes the bending area 104 and the bending reinforcement areas on both sides of the bending area 104, and is connected to the area where the first steam sub-channel 401 is located at the bottom edge. In this embodiment, since the flow direction of the steam in the bending area 104 changes significantly, the present invention makes the second steam sub-channel 402 pass through the bending area 104 and the bending reinforcement area, and is connected to the area where the first steam sub-channel 401 is located at the bottom edge, so as to increase the flow space of the steam, avoid the steam from being blocked in the bending area 104, thereby accelerating the flow of steam, thereby accelerating the transfer of the working medium, and thus greatly improving the heat dissipation effect of the bendable heat sink.

[0044] Furthermore, the longitudinal length of the long support strip 1013 should be no less than 1 / 2 of the total longitudinal length of the bending structure 1041 in the bending area 104 , and the transverse length of the long support column should be no greater than the diameter of the second support column 1011 .

[0045] In the embodiment of the present invention, the first support column 1021 and the second support column 1011 are cylindrical support columns, and the size and position of the first support column 1021 at the edge of the inner cavity of the light panel 102 correspond to the size and position of the second support column 1011 at the corresponding position on the support panel 101, so as to ensure that after the light panel 102 and the support panel 101 are vertically attached, the support columns at the edges are aligned one by one. In addition, the first support column 1021 and the second support column 1011 can also be replaced with other structures with the same support capacity, such as square support columns, strip support columns, etc., and the embodiment of the present invention is not limited thereto.

[0046] In this embodiment, the ratio between two adjacent second support columns 1011 and the cylinder diameter should be no less than 1.2, so that they can collapse effectively, thereby ensuring the flow of the second steam channel 5.

[0047] Example 2

[0048] See also Figure 6The present invention discloses a bendable vapor chamber, comprising a shell 1, a one-dimensional liquid wick 2, and a two-dimensional liquid wick 3. The shell 1 comprises a support plate 101 and a light plate 102. The support plate 101 and the light plate 102 are sealedly connected at their edges to form a shell 1 having a cavity 103. A bending area 104 is provided in the middle of the shell 1. The bending area 104 divides the cavity 103 into an evaporation area 105 and a condensation area 106. At least one area of ​​the light plate 102 is provided with a plurality of first support columns 1021 abutting against the support plate 101. The one-dimensional wick 2 is sintered on the inner side of the light plate 102 and avoids the area where the first support column 1021 is provided to form a first steam channel 4, and the first steam channel 4 at least passes through the bending area 104 and the condensation area 106; multiple two-dimensional wicks 3 are provided on the one-dimensional wick 2 and each of the two-dimensional wicks 3 extends from the evaporation area 105 to the condensation area 106; the support plate 101 is provided with a second support column 1011 abutting against the one-dimensional wick 2, and a second steam channel 5 is formed between the second support columns 1011.

[0049] This embodiment differs from Embodiment 1 in that the first steam channel 4 includes a first steam sub-channel 401, which is arranged around the edge of the light plate 102; no second steam sub-channel 402 is provided. Specifically, only the first support column 1021 at the edge remains on the light plate 102. When steam is transferred to the bending area 104, the first steam sub-channel 401 forms a closed loop at the edge of the light plate 102, which also promotes the flow of steam, thereby pushing the liquid working medium from the cold source toward the heat source. Under the combined action of capillary force and vapor pressure, the liquid working medium flows back to the evaporation area 105, thereby enhancing the heat dissipation effect of the bent heat sink.

[0050] Example 3

[0051] See also Figure 5The present invention discloses a bendable vapor chamber, comprising a shell 1, a one-dimensional liquid wick 2, and a two-dimensional liquid wick 3. The shell 1 comprises a support plate 101 and a light plate 102. The support plate 101 and the light plate 102 are sealedly connected at their edges to form a shell 1 having a cavity 103. A bending area 104 is provided in the middle of the shell 1. The bending area 104 divides the cavity 103 into an evaporation area 105 and a condensation area 106. At least one area of ​​the light plate 102 is provided with a plurality of first support columns 1021 abutting against the support plate 101. The one-dimensional wick 2 is sintered on the inner side of the light plate 102 and avoids the area where the first support column 1021 is provided to form a first steam channel 4, and the first steam channel 4 at least passes through the bending area 104 and the condensation area 106; multiple two-dimensional wicks 3 are provided on the one-dimensional wick 2 and each of the two-dimensional wicks 3 extends from the evaporation area 105 to the condensation area 106; the support plate 101 is provided with a second support column 1011 abutting against the one-dimensional wick 2, and a second steam channel 5 is formed between the second support columns 1011.

[0052] The difference between this embodiment and embodiment 1 is that the first steam channel 4 of this embodiment also includes a first steam sub-channel 401 and a second steam sub-channel 402, but the first steam sub-channel 401 of this embodiment is only provided at the edge of the condensation zone 106 on the light plate 102; the second steam sub-channel 402 is also provided between two adjacent two-dimensional liquid wicks 3, and the second steam sub-channel 402 at least passes through the bending zone 104 and the condensation zone 106, and directly connects to the first steam sub-channel 401. In this embodiment, similarly, the top working fluid absorbs heat and vaporizes and is mainly transmitted to the condensation zone 106 through the second steam channel 5. When the steam is transmitted to the vicinity of the cold source of the bendable heat spreader, it will be transmitted to the cold source area through the second steam channel 5 and the second steam sub-channel 402 at the same time; Figure 1 and Figure 2 As shown, when liquid working medium accumulates on the bending area 104 and is about to block the second steam channel 5, a liquid film cannot be formed because there is no one-dimensional liquid wick 2 structure in the area of ​​the second steam sub-channel 402, thereby ensuring that the second steam sub-channel 402 will not be blocked. At this time, the steam continues to be transmitted to the condensation area 106 through the second steam sub-channel 402. At this time, the second steam sub-channel 402 is connected to the first steam sub-channel 401 located at the bottom of the condensation area 106, so that each second steam sub-channel 402 can be connected, and the steam pressure generated by the steam will push the liquid working medium of the cold source to move to the heat source, so that the liquid working medium can flow back to the evaporation area 105 under the combined action of capillary force and vapor pressure, thereby improving the liquid transmission capacity of the heat spreader and effectively improving the heat dissipation efficiency of the bent heat spreader. The bendable heat spreader of the utility model can effectively reduce the attenuation of the heat spreader performance caused by bending.

[0053] Example 4

[0054] like Figure 7 As shown, the embodiment of the present invention further provides a method for processing the bendable vapor chamber of the above embodiment, comprising the following steps:

[0055] Step 1: Etching the support plate 101 and the light plate 102 respectively, and processing the first support column 1021 on the light plate 102 and the second support column 1011 on the support plate 101 respectively; when the support plate 101 is subjected to high-temperature annealing, the annealing temperature is not less than 500° C.;

[0056] Step 2: Laminating the light plate 102 with the silk screen and sintering them at high temperature to form a one-dimensional liquid absorbent core 2. During the sintering process, the one-dimensional liquid absorbent core 2 must avoid the first support pillars 1021. The sintering temperature is not less than 600°C, and the sintering pressure is not less than 3kg. The silk screen can be trimmed before sintering to avoid the first support pillars 1021.

[0057] Step 3: punch out the liquid injection ports 6 on the liquid injection sections of the light plate 102 and the support plate 101 respectively;

[0058] Step 4: After the two-dimensional wick 3 is chemically oxidized and placed in the corresponding position of the support plate 101, the light plate 102 sintered with the one-dimensional wick 2 is sealed and covered on the support plate 101. Specifically, during the oxidation treatment, the two-dimensional wick 3 can be immersed in a mixed solution of sodium hydroxide and potassium persulfate for more than 20 minutes to obtain a copper wick that is approximately black.

[0059] Step 5: Place the covered housing 1 into a diffusion welding graphite mold for diffusion welding at a temperature of not less than 750° C. to form a semi-finished sample of the vapor chamber. During the diffusion welding, the compression amount should be not less than 0.02 mm, which is approximately 1 / 20 of the total thickness of the vapor chamber.

[0060] In this step, for applications with lower structural strength requirements, brazing can also be used, that is, a layer of brazing material is coated on the weld edge of the heat sink, and the bare plate 102 and the support plate 101 are closed and then welded at high temperature to achieve a sealed connection between the shell plates. Other welding methods including laser welding and resistance welding are also applicable to the present invention;

[0061] Step 6: insert the liquid injection tube into the liquid injection port 6 of the semi-finished heat spreader, put on the welding ring, and weld the liquid injection tube to the liquid injection port 6 of the heat spreader using high-frequency welding;

[0062] Step 7: Pour the working medium into the vapor chamber from the liquid injection port 6, with the liquid volume accounting for more than 20% of the volume of the internal cavity 103;

[0063] Step 8: Vacuum the vapor chamber to ensure the low temperature environment is below -15°C and the internal pressure is controlled below 1 Pa. Resistance welding is then performed at the liquid injection port 6 to completely seal the internal cavity 103 of the vapor chamber, thereby obtaining a bendable vapor chamber.

[0064] Step 9: Bend the bendable vapor chamber in the bending area 104 by stamping to obtain the final product.

[0065] After the bendable heat spreader is obtained through the above process, the bendable heat spreader is bent in the bend area 104 by stamping to obtain the following: Figure 4 The bent heat sink shown.

[0066] The bendable heat spreader prepared by the present invention is characterized in that a plurality of first support columns 1021 abutting against the support plate 101 are provided in at least one area of ​​the light plate 102, a one-dimensional liquid absorbent core 2 is sintered on the inner side of the light plate 102 and avoids the area where the first support columns 1021 are provided to form a first steam channel 4, wherein the first steam channel 4 at least passes through the bending area 104 and the condensation area 106; a plurality of two-dimensional liquid absorbent cores 3 are provided on the one-dimensional liquid absorbent core 2 and each of the two-dimensional liquid absorbent cores 3 extends from the evaporation area 105 to the condensation area 106, a second support column 1011 abutting against the one-dimensional liquid absorbent core 2 is provided on the support plate 101, and a second steam channel 5 is formed between the second support columns 1011; after the top working medium absorbs heat and vaporizes, it is mainly transmitted to the condensation area 106 through the second steam channel 5, and when the steam is transmitted to the vicinity of the cold source of the heat spreader, it will simultaneously pass through the second steam channel 5. A steam channel 4 and a second steam channel 5 are transmitted to the condensation area 106. Therefore, when liquid working medium accumulates on the bending area 104 of the heat spreader and will block the second steam channel 5, a liquid film cannot be formed because there is no liquid absorption core structure in the area of ​​the first steam channel 4, thereby ensuring that the first steam channel 4 will not be blocked, thereby solving the blockage problem of the steam channel in the bending area 104; moreover, when steam is transmitted to the bending area of ​​the heat spreader through the first steam channel 4, the steam pressure generated by the circulating steam in the first steam channel 4 will push the liquid working medium of the cold source to move toward the heat source, thereby realizing the liquid working medium to reflux to the evaporation area 105 under the combined action of capillary force and vapor pressure, instead of the traditional heat spreader relying only on the capillary force of the liquid absorption core to realize the working medium reflux, thereby effectively improving the liquid transmission capacity of the heat spreader, thereby solving the performance degradation and "reversible" failure problem of the heat spreader due to bending.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bendable vapor chamber, characterized in that: The invention comprises a shell, a one-dimensional liquid absorbent core and a two-dimensional liquid absorbent core, wherein the shell comprises a support plate and a light plate, wherein the support plate is sealedly connected to the edge of the light plate to form a shell having a cavity; a bending area is provided in the middle of the shell, and the bending area divides the cavity into an evaporation area and a condensation area; at least one area of ​​the light plate is provided with a plurality of first support columns abutting against the support plate, the one-dimensional liquid absorbent core is sintered on the inner side of the light plate and avoids the area where the first support columns are provided to form a first steam channel, and the first steam channel at least passes through the bending area and the condensation area; a plurality of two-dimensional liquid absorbent cores are provided on the one-dimensional liquid absorbent core and each of the two-dimensional liquid absorbent cores extends from the evaporation area to the condensation area; a second support column abutting against the one-dimensional liquid absorbent core is provided on the support plate, and a second steam channel is formed between the second support columns.

2. The bendable vapor chamber according to claim 1, characterized in that: The first steam channel includes a first steam sub-channel, and the first steam sub-channel is arranged around the edge of the light plate.

3. The bendable vapor chamber according to claim 2, characterized in that: The first steam channel also includes a second steam sub-channel, which is respectively arranged between two adjacent two-dimensional liquid wicks; the second steam sub-channel at least passes through the bending area and the condensation area, and directly connects to the first steam sub-channel in the condensation area.

4. The bendable vapor chamber according to claim 1, characterized in that: The first steam channel includes a first steam sub-channel and a second steam sub-channel. The first steam sub-channel is arranged at the edge of the condensation area on the light plate, and the second steam sub-channel is respectively arranged between two adjacent two-dimensional liquid-absorbing cores; the second steam sub-channel at least passes through the bending area and the condensation area, and directly connects to the first steam sub-channel.

5. The bendable vapor chamber according to claim 1, characterized in that: Liquid injection ports are provided on the tops of the support plate and the light plate, and guiding structures for guiding the discharge of non-condensable gas are provided on both sides of the liquid injection ports.

6. The bendable vapor chamber according to claim 5, characterized in that: The guiding structure is a beveled frame arranged on both sides of the liquid injection port, and the angle formed between the two beveled frames in the cavity is less than 180°.

7. The bendable vapor chamber according to claim 1, characterized in that: A groove is provided on the support plate at a position corresponding to the two-dimensional liquid absorbent core. No second support column is provided in the groove, and the two-dimensional liquid absorbent core is in contact with the groove.

8. The bendable vapor chamber according to claim 1, characterized in that: The bending area of ​​the support plate is provided with bending structures equidistantly distributed along the width direction of the support plate, and the bending structure includes support blocks equidistantly distributed along the length direction of the support plate.

9. The bendable vapor chamber according to claim 8, characterized in that: Long support strips are respectively provided on both ends of the support plate at the bending structure.

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