Heat sink and preparation method thereof, and battery

Abstract

The present invention provides a vapor chamber and a preparation method thereof, and a battery. The preparation method of the vapor chamber comprises the following steps: assembling a wire mesh on one side of a first plate body to prepare a first preform; assembling a liquid wick on the side of a second plate body facing the first plate body to prepare a second preform; installing the side of the first preform having the wire mesh on the side of the second preform having the liquid wick to prepare a vapor chamber. The present invention aims to solve the technical problems of complex vapor chamber assembly steps, low production efficiency, and low thermal conductivity in the related art.

Description

Technical Field

[0001] The present invention relates to the technical field of vapor chambers, and in particular to a vapor chamber and a preparation method thereof, and a battery. Background Art

[0002] A heat spreader is a phase change heat transfer element that uses the latent heat of phase change of the working fluid to carry away heat. It is the most promising thermal management method to solve the heat dissipation problem of products and equipment. At present, heat spreaders are mainly used for heat dissipation of electronic equipment. They have excellent thermal conductivity, a large heat transfer area and good temperature uniformity; in particular, they are ultra-thin, and the external dimensions can be adjusted according to actual heat dissipation requirements. In the related art, a plurality of mounting protrusions are provided on the two plates of the heat spreader. When assembling the heat spreader, it is necessary to first fix the wire mesh and the liquid wick to the two plates through the plurality of mounting protrusions. During installation, it is also necessary to align the wire mesh and the mounting protrusions, and the liquid wick and the mounting protrusions. The assembly steps are complicated, the production efficiency is low, and the mounting protrusions occupy additional space, which reduces the thermal conductivity of the heat spreader. Summary of the invention

[0003] The embodiments of the present invention provide a vapor chamber and a method for preparing the same, and a battery. The present invention aims to solve the technical problems in the related art of complex vapor chamber assembly steps, low production efficiency, and low thermal conductivity.

[0004] In a first aspect, an embodiment of the present invention provides a method for preparing a vapor chamber, comprising the following steps:

[0005] Assembling the wire mesh on one side of the first plate body to prepare a first preform;

[0006] Assembling the liquid absorbent core on the side of the second plate body facing the first plate body to prepare a second preform;

[0007] The side of the first preform with the wire mesh is mounted on the side of the second preform with the liquid absorbent core to prepare a vapor chamber.

[0008] In one embodiment, assembling the screen on one side of the first plate to prepare the first preform comprises the following steps:

[0009] The screen is attached to one side of the first plate by alcohol; or,

[0010] The wire mesh is attached to one side of the first plate through deionized water; or,

[0011] The wire mesh is welded to one side of the first plate.

[0012] In one embodiment, assembling the absorbent core on the side of the second plate body facing the first plate body to prepare the second preform comprises the following steps:

[0013] The liquid wick is attached to the side of the second plate body facing the first plate body by alcohol; or,

[0014] The liquid wick is attached to the side of the second plate body facing the first plate body through deionized water; or,

[0015] The liquid wick is welded to a side of the second plate body facing the first plate body.

[0016] In one embodiment, in the step of mounting the side of the first preform having the wire mesh on the side of the second preform having the wick to prepare the vapor chamber, the first preform and the second preform are fixed by diffusion welding.

[0017] In one embodiment, the step of mounting the side of the first preform having the wire mesh on the side of the second preform having the wick to prepare the vapor chamber comprises the following steps:

[0018] The first preform and the second preform that have been installed are placed on a graphite jig, and the graphite jig is placed in a diffusion welding furnace to heat and pressurize.

[0019] In one embodiment, the height of the receiving portion in the graphite fixture is H1, the sum of the thicknesses of the first preform and the second preform is H2, and 0.03≤H1 / H2≤0.05.

[0020] In one embodiment, after the step of mounting the side of the first preform having the wire mesh on the side of the second preform having the wick to prepare a vapor chamber, the following steps are further included:

[0021] The air tightness test of the vapor chamber is performed.

[0022] In one embodiment, after the step of performing air tightness test on the vapor chamber, the following steps are further included:

[0023] The heat spreader is subjected to annealing, vacuuming and water bath treatment in sequence.

[0024] In one embodiment, the steps of sequentially annealing, vacuuming and water bathing the vapor chamber include the following steps:

[0025] Under the protection of inert gas, placing the heat soaking plate in an annealing furnace for annealing treatment;

[0026] Under the protection of inert gas, injecting working fluid into the heat sink after annealing;

[0027] Vacuuming and sealing the heat spreader filled with the working fluid;

[0028] The heat plate is subjected to water bath treatment.

[0029] In one embodiment, after the steps of sequentially annealing, vacuumizing and water bathing the vapor chamber, the following steps are further included:

[0030] Connecting the vapor chamber to a rat-tail tube, and heating the vapor chamber so that the gas in the vapor chamber is discharged into the rat-tail tube;

[0031] The heat spreader is sealed and tail-cut.

[0032] In a second aspect, an embodiment of the present invention provides a vapor chamber, which is manufactured by the vapor chamber manufacturing method as described above, and the vapor chamber comprises:

[0033] A first preform, comprising a first plate and a wire mesh, wherein the wire mesh is arranged on one side of the first plate;

[0034] A second preform is arranged opposite to the first preform and forms a closed inner cavity with the first preform, wherein the second preform comprises a second plate and a liquid absorbent core, wherein the liquid absorbent core is arranged on a side of the second plate facing the first plate;

[0035] Wherein, the liquid wick and the wire mesh are located in the inner cavity, and a working fluid is arranged in the inner cavity.

[0036] In one embodiment, a first receiving groove is formed on the first plate body, the opening of the first receiving groove faces the second plate body, and a first connecting wall surrounds the groove wall of the first receiving groove;

[0037] Wherein, the wire mesh is arranged in the first containing groove and is fixedly connected to the groove bottom of the first containing groove.

[0038] In one embodiment, the screen is attached to the bottom of the first containing groove through a first connecting medium; or,

[0039] The wire mesh is welded to the bottom of the first containing groove.

[0040] In one embodiment, the second plate body is formed with a second accommodating groove, the opening of the second accommodating groove faces the first plate body, and the groove wall of the second accommodating groove is surrounded by a second connecting wall;

[0041] Wherein, the liquid wick is arranged in the second containing groove and is fixedly connected to the groove bottom of the second containing groove.

[0042] In one embodiment, the absorbent core is attached to the bottom of the second containing tank via a second connecting medium; or,

[0043] The liquid wick is welded to the bottom of the second containing tank.

[0044] In one embodiment, the first connecting wall and the second connecting wall are connected by welding to fix the first plate body and the second plate body.

[0045] In a third aspect, an embodiment of the present invention provides a battery, comprising the above-mentioned heat sink.

[0046] Beneficial effects of the embodiments of the present invention:

[0047] In the technical solution of the present invention, the wire mesh is assembled on one side of the first plate body to prepare a first preform; the liquid absorbent core is assembled on the side of the second plate body facing the first plate body to prepare a second preform; the side of the first preform having the wire mesh is installed on the side of the second preform having the liquid absorbent core to prepare a heat spreader; the internal structure of the heat spreader is simple, with only the wire mesh and the liquid absorbent core, the wire mesh is directly connected to the first body, and the liquid absorbent core is directly connected to the second plate body, shortening the heat conduction path and achieving rapid heat conduction, thereby solving the problem of reduced thermal conductivity of the heat spreader in the related art; at the same time, by preparing the wire mesh and the first plate body as the first preform, and preparing the liquid absorbent core and the second plate body as the second preform, the installation steps of the heat spreader can be simplified and the installation efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 Schematic diagram of a process for preparing a heat spreader provided by the present invention

[0050] Figure 2 It is a structural schematic diagram of an embodiment of a vapor chamber provided by the present invention;

[0051] Figure 3 yes Figure 2 Explosion diagram of the heat plate;

[0052] Figure 4 yes Figure 2 A schematic structural diagram of the first prefabricated component;

[0053] Figure 5 yes Figure 2 A schematic diagram of the structure of the second prefabricated part;

[0054] Figure 6is a schematic structural diagram of another embodiment of the vapor chamber provided by the present invention;

[0055] Figure 7 It is a structural schematic diagram of another embodiment of the heat spreader provided by the present invention.

[0056] Description of Figure Numbers

[0057]

[0058] DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0060] In the related art, a plurality of mounting protrusions are provided on the two plates of the heat spreader. When assembling the heat spreader, the wire mesh and the liquid wick need to be fixed on the two plates through the plurality of mounting protrusions first. During installation, the wire mesh and the mounting protrusions, the liquid wick and the mounting protrusions need to be aligned and calibrated. The assembly steps are complicated, the production efficiency is low, and the mounting protrusions occupy additional space, which reduces the thermal conductivity of the heat spreader.

[0061] In view of this, the present invention proposes a method for preparing a vapor chamber. Figure 1 This is a schematic flow chart of an embodiment of a method for preparing a vapor chamber provided by the present invention. The method for preparing a vapor chamber will be described in detail below in conjunction with the main drawings.

[0062] See also Figure 1 The preparation method of the vapor chamber comprises the following steps:

[0063] S10, assembling the wire mesh 12 on one side of the first plate 11 to prepare a first preform 10;

[0064] S20, assembling the liquid absorbent core 22 on the side of the second plate body 21 facing the first plate body 11 to prepare a second preform 20;

[0065] S30 , installing the side of the first preform 10 having the wire mesh 12 on the side of the second preform 20 having the liquid wick 22 to prepare the vapor chamber 100 .

[0066] In the technical solution of the present invention, the wire mesh 12 is assembled on one side of the first plate body 11 to prepare the first preform 10; the liquid absorbent core 22 is assembled on the side of the second plate body 21 facing the first plate body 11 to prepare the second preform 20; the side of the first preform 10 with the wire mesh 12 is installed on the side of the second preform 20 with the liquid absorbent core 22 to prepare the heat spreader 100; the internal structure of the heat spreader 100 is simple, with only the wire mesh 12 and the liquid absorbent core 22. The wire mesh 12 is directly connected to the first plate body 11, and the liquid absorbent core 22 is directly connected to the second plate body 21, which shortens the heat conduction path and can achieve rapid heat conduction, thereby solving the problem of reduced thermal conductivity of the heat spreader 100 in the related art; at the same time, by preparing the wire mesh 12 and the first plate body 11 as the first preform 10, and preparing the liquid absorbent core 22 and the second plate body 21 as the second preform 20, the installation steps of the heat spreader 100 can be simplified and the installation efficiency can be improved.

[0067] In this embodiment, an inner cavity is formed between the first preform 10 and the second preform 20, the wire mesh 12 and the wick 22 are arranged in the inner cavity, and a working fluid is arranged in the inner cavity, and the working fluid is used for heat exchange.

[0068] In step S10, one purpose of setting the first preform 10 is to facilitate the assembly of the heat spreader 100, assemble the wire mesh 12 and the first plate body 11, realize the prefabrication of the wire mesh 12 and the first plate body 11, facilitate the assembly in subsequent steps, save time, and improve work efficiency. Another purpose is to enable the wire mesh 12 to be directly connected to the first plate body 11, thereby shortening the heat conduction path and improving the heat conduction effect.

[0069] It should be noted that in the related art, by setting a mounting protrusion on the first plate body 11, the wire mesh 12 is clamped on the mounting protrusion, thereby realizing the connection between the wire mesh 12 and the first plate body 11. The mounting protrusion will occupy a certain space, resulting in a reduction in the space of the inner cavity, thereby reducing the thermal conductivity of the heat spreader 100. At the same time, when the mounting protrusion is set, the wire mesh 12 needs to be aligned with the mounting protrusion when assembling the wire mesh 12, resulting in an increase in installation time. In addition, setting the mounting protrusion on the first plate body 11 adds an additional structure, increases the processing time, and thus increases the cost.

[0070] In order to avoid the above situation, in the present application, the wire mesh 12 is directly attached to one side of the first plate 11. Specifically, the connection method between the wire mesh 12 and the first plate 11 is not limited and can be selected according to the actual situation. For example, in some embodiments, the wire mesh 12 is attached to one side of the first plate 11 by alcohol; in other embodiments, the wire mesh 12 is attached to one side of the first plate 11 by deionized water; in another embodiment, the wire mesh 12 is welded to one side of the first plate 11.

[0071] In some embodiments, the step S10 is described by taking the screen 12 being attached to one side of the first plate 11 by alcohol as an example. Specifically, the step S10 further includes the following steps:

[0072] S101, applying alcohol on one side of the first plate body 11, and adsorbing the screen 12 on the one side of the first plate body 11 by the alcohol;

[0073] S102 , sintering and fixing the first plate body 11 and the wire mesh 12 to obtain a first preform 10 .

[0074] In step S101, alcohol is first applied on one side of the first plate 11. The alcohol serves as an adhesive. When the screen 12 is placed on the first plate 11, the screen 12 can fit tightly on the first plate 11 due to the effect of pressure, thereby pre-fixing the screen 12 and the first plate 11.

[0075] In step S102, the pre-fixed first plate 11 and the wire mesh 12 are placed in a sintering furnace, and the wire mesh 12 is fixed on the first plate 11 by sintering. During the sintering process, the alcohol evaporates as the temperature increases, and thus disappears, so that the wire mesh 12 can be closely attached to the first plate 11. In this embodiment, during the sintering process, the alcohol gradually evaporates as the temperature increases, so that no impurities, etc., exist between the wire mesh 12 and the first plate 11.

[0076] In some embodiments, the sintering furnace can be a tunnel sintering furnace or a bell jar sintering furnace, which can be selected according to actual conditions. The sintering method (temperature, etc.) of the tunnel sintering furnace and the sintering method (temperature, etc.) of the bell jar sintering furnace can refer to the conventional settings in the art.

[0077] Specifically, in this embodiment, the wire mesh 12 is a copper mesh, and there are many capillary structures on the outer surface of the copper mesh. The wire mesh 12 and the first plate body 11 are fixed by sintering. The high temperature can improve the hydrophilicity of the capillary structure of the wire mesh 12, so that the wire mesh 12 can better absorb the working fluid during the later use, thereby improving the thermal conductivity of the heat spreader 100. At the same time, the capillary structure on the sintered wire mesh 12 is more stable, the liquid absorption capacity and liquid return capacity are more stable, and the thermal conductivity effect is better.

[0078] More specifically, sintering can improve the stability of the first plate body 11 and the wire mesh 12, and they can maintain their original state even in extreme high or low temperature environments without expansion or deformation, thereby making the structure of the heat spreader 100 more stable.

[0079] In some other embodiments, the operation of attaching the screen 12 to one side of the first plate 11 through deionized water is the same as that of attaching the screen 12 to one side of the first plate 11 through alcohol. Please refer to the above embodiments and will not repeat them here.

[0080] In some other embodiments, the step S10 is described by taking the case where the wire mesh 12 is welded to one side of the first plate 11 as an example. Specifically, the step S10 further includes the following steps:

[0081] S101, welding the wire mesh 12 to one side of the first plate 11 by spot welding;

[0082] S102 , sintering and fixing the first plate body 11 and the wire mesh 12 to obtain a first preform 10 .

[0083] In step S101 , the wire mesh 12 is disposed on one side of the first plate body 11 , and the wire mesh 12 is welded to the first plate body 11 by spot welding, thereby completing the pre-fixation of the wire mesh 12 and the first plate body 11 .

[0084] In step S102, the pre-fixed first plate 11 and wire mesh 12 are placed in a sintering furnace, and the wire mesh 12 is fixed to the first plate 11 by sintering. During the sintering process, the spot welding marks disappear with the high temperature, so that the wire mesh 12 can fit tightly to the first plate 11.

[0085] In step S20, the purpose of setting the second preform 20 is to facilitate the assembly of the heat spreader 100, assemble the liquid absorbent core 22 and the second plate body 21, realize the prefabrication of the liquid absorbent core 22 and the second plate body 21, facilitate the assembly in subsequent steps, save time, and improve work efficiency. Another purpose is to enable the liquid absorbent core 22 to be directly connected to the second plate body 21, thereby shortening the heat conduction path and improving the heat conduction effect.

[0086] The connection method between the wick 22 and the second plate 21 is not limited and can be selected according to actual conditions. For example, in some embodiments, the wick 22 is attached to the side of the second plate 21 facing the first plate 11 by alcohol; in other embodiments, the wick 22 is attached to the side of the second plate 21 facing the first plate 11 by deionized water; in one embodiment, the wick 22 is welded to the side of the second plate 21 facing the first plate 11, and more specifically, the wick 22 is welded to the side of the second plate 21 facing the first plate 11 by resistance welding.

[0087] See also Figure 1 , in step S30, the first preform 10 and the second preform 20 are fixed by diffusion welding. The heat spreader 100 provided in the present application is mainly used in batteries. Therefore, the heat spreader 100 itself needs to have a high structural strength so as to be able to resist the expansion force of the battery, and needs to have good sealing to avoid leakage of the working fluid inside the heat spreader 100. Welding is performed by diffusion welding, and new compounds are generated at the connection between the first preform 10 and the second preform 20 under high temperature and high pressure environment, thereby improving the structural strength of the first preform 10 and the second preform 20. At the same time, the high temperature and high pressure environment can make the molecules of the first preform 10 and the second preform 20 closer, thereby improving the corrosion resistance of the first preform 10 and the second preform 20.

[0088] In some embodiments, step S30 includes the following steps:

[0089] S301, placing the assembled first preform 10 and second preform 20 on a graphite jig, placing the graphite jig in a diffusion welding furnace, and heating and pressurizing.

[0090] In this embodiment, the specific structure of the graphite fixture may refer to conventional settings in the art.

[0091] Specifically, in step S301, the first preform 10 is first arranged on the second preform 20, and then the first preform 10 and the second preform 20 are placed in the accommodating cavity of the graphite jig, and the first preform 10 and the second preform 20 are pre-fixed by the graphite jig, and then the graphite jig with the first preform 10 and the second preform 20 is placed in a diffusion welding furnace, and the parameters of the diffusion welding furnace are adjusted, and the first preform 10 and the second preform 20 are fixed in a high temperature and high pressure environment, so as to obtain the heat spreader 100.

[0092] In the above steps, it is preferred to place the first preform 10 on the second preform 20. The reason for this is that in step S10, the first plate body and the second plate body are relatively fixed after sintering, while in step S20, the second plate body and the liquid absorbent core 22 are not sintered. If the second preform 20 is placed on the first preform 10, it is necessary to ensure that the liquid absorbent core 22 will not be offset, which is relatively complicated to operate. Therefore, in the above steps, it is preferred to place the first preform 10 on the second preform 20. Due to sintering, the wire mesh 12 is relatively fixed to the first plate body 11. During the installation process, the wire mesh 12 will not be offset, which can reduce the difficulty of operation and improve work efficiency.

[0093] In some embodiments, the height of the receiving portion in the graphite jig is H1, the sum of the thicknesses of the first preform 10 and the second preform 20 is H2, and 0.03≤H1 / H2≤0.05. It should be noted that when H1 / H2 is less than 0.03, the height of the receiving portion of the graphite jig is small, resulting in the inability to fully accommodate the first preform 10 and the second preform 20, and poor welding may occur during the welding process. When H1 / H2 is greater than 0.05, the size of the receiving cavity increases, and during the welding process, the first preform 10 and the second preform 20 will diffuse to the surroundings, resulting in a larger size of the heat spreader 100, which does not meet production requirements.

[0094] After step S30, the method further includes the following steps:

[0095] S40, disposing a water injection pipe on the heat spreader 100.

[0096] Specifically, in step S40 , the water injection pipe is inserted into the vapor chamber 100 , a welding ring is sleeved on the water injection pipe, and a high-frequency welding machine is used to weld the water injection pipe to the vapor chamber 100 .

[0097] After step S40, the following steps are also included:

[0098] Step S50 , performing an air tightness test on the vapor chamber 100 .

[0099] In some embodiments, in step S50, a helium mass spectrometer is used to detect the air tightness of the heat spreader 100. Helium is injected into the heat spreader 100 through a water injection port for 5 to 10 seconds to detect whether there is any leakage around the heat spreader 100. If there is no helium leakage, it indicates that the air tightness of the heat spreader 100 is qualified.

[0100] In some other methods, in step S50, a water bubble leak test is used to detect the air tightness of the heat spreader 100. The heat spreader 100 is placed in water with the water inlet outside the water surface. Gas is injected into the heat spreader 100 for 5 to 10 seconds, and the water surface is observed to see whether there are bubbles. If no bubbles are generated on the water surface, it is proved that the air tightness of the heat spreader 100 is qualified.

[0101] Specifically, after step S50, the following steps are also included:

[0102] S60, sequentially performing annealing, vacuuming and water bath treatment on the heat spreader 100.

[0103] Step S60 also includes the following steps:

[0104] S601, under the protection of inert gas, placing the heat spreader 100 in an annealing furnace for annealing treatment.

[0105] In step S601, the heat spreader 100 with qualified air tightness is placed in the annealing furnace again, and the heat spreader 100 is annealed and reduced under the protection of inert gas. The oxide layer on the surface of the heat spreader 100 is removed by annealing and reduction, and the corrosion resistance of the heat spreader 100 is improved, thereby improving the service life of the heat spreader 100. Specifically, the annealing furnace can be a tunnel sintering furnace or a bell jar sintering furnace, which can be selected according to actual conditions. The sintering method (temperature, etc.) of the tunnel sintering furnace and the sintering method (temperature, etc.) of the bell jar sintering furnace can refer to the conventional settings in the field.

[0106] S602 , under the protection of inert gas, inject working fluid into the heat spreader 100 after annealing.

[0107] In step S602, the heat spreader 100 is taken out of the annealing furnace, cooled to room temperature, and then the working fluid is injected into the heat spreader 100. During the injection process, the working fluid can be injected into the heat spreader 100 while an inert gas is blown into the heat spreader 100. This arrangement is to avoid accumulation of the working fluid so that the working fluid can fill the entire heat spreader 100, thereby ensuring the thermal conductivity of the heat spreader 100.

[0108] S603, vacuum-seal the heat spreader 100 filled with the working fluid.

[0109] In step S603, the vapor chamber 100 after liquid injection is evacuated so that the vacuum degree inside the vapor chamber 100 is lower than the normal atmospheric pressure. Specifically, the vacuum degree inside the vapor chamber 100 needs to be maintained at 0.007-0.008 torr.

[0110] S604 , subjecting the heat spreader 100 to a water bath treatment.

[0111] In step S604, the purpose of subjecting the heat spreader 100 to water bath treatment is to test the vacuum thermal conductivity state inside the heat spreader 100. Specifically, one-third of the heat spreader 100 is placed in a water bath and heated. The temperature of the portion of the heat spreader 100 in the water bath is tested, and then the temperature of the portion of the heat spreader 100 outside the water bath is tested. If the temperature difference between the two is less than or equal to 5 degrees, it is considered qualified.

[0112] It should be noted that the test method, test temperature, test conditions and test duration of the water bath can refer to the conventional settings in the field and will not be described in detail here.

[0113] After step S60, the following steps are also included:

[0114] S70, connecting the vapor chamber 100 to the rat-tail tube, and heating the vapor chamber 100 so that the gas in the vapor chamber 100 is discharged into the rat-tail tube;

[0115] S80, sealing and cutting the heat spreader 100.

[0116] The heat spreader 100 that has passed the water bath test is subjected to a secondary degassing operation. The heat spreader 100 is connected to the rat tail tube and heated vertically (i.e., the heat spreader 100 is placed in a vertical state) so that the exhaust gas in the heat spreader 100 is discharged into the water level dryer, and then resistance welding is used to seal and cut the tail.

[0117] In some embodiments, the shape of the vapor chamber 100 may be changed so that the vapor chamber 100 can be suitable for various environments. Specifically, the shape of the vapor chamber 100 may be changed according to actual conditions.

[0118] See also Figure 2 In some embodiments, the heat spreader 100 includes a first portion, a second portion, and a third portion, wherein the second portion is connected between the first portion and the third portion, the first portion, the second portion, and the third portion are located in the same plane, and the heat spreader 100 is a "1" type structure.

[0119] See also Figure 6 In some other embodiments, the heat spreader 100 includes a first portion, a second portion and a third portion, wherein the second portion is connected between the first portion and the third portion, and the second portion is bent so that the first portion and the third portion are located on different planes, and the heat spreader 100 is an "L"-shaped structure.

[0120] See also Figure 7 In some embodiments, two “L”-shaped vapor chambers 100 may be combined to form a “T”-shaped vapor chamber 100 .

[0121] The present invention also provides a vapor chamber 100, which is made by the vapor chamber preparation method described above. Figure 2-Figure 7 The present invention provides a schematic structural diagram of an embodiment of a vapor chamber 100 , and the vapor chamber 100 will be described in detail below in conjunction with the main drawings.

[0122] See also Figure 2 and Figure 3 The heat spreader 100 includes a first preform 10 and a second preform 20. The first preform 10 includes a first plate body 11 and a wire mesh 12. The wire mesh 12 is arranged on one side of the first plate body 11. The second preform 20 is arranged opposite to the first preform 10 and forms a closed inner cavity with the first preform 10. The second preform 20 includes a second plate body 21 and a liquid absorbent core 22. The liquid absorbent core 22 is arranged on the side of the second plate body 21 facing the first plate body 11. The liquid absorbent core 22 and the wire mesh 12 are located in the inner cavity, and a working fluid is arranged in the inner cavity.

[0123] The heat spreader 100 provided by the present invention has a simple structure, low manufacturing cost, and high efficiency in heat diffusion. The first preform 10 includes a first plate body 11 and a wire mesh 12, the wire mesh 12 is arranged on the first plate body 11, the second preform 20 includes a second plate body 21 and a liquid absorbent core 22, the liquid absorbent core 22 is arranged on the side of the second plate body 21 facing the first plate body 11, the wire mesh 12 is directly connected to the first body, and the liquid absorbent core 22 is directly connected to the second plate body 21, shortening the heat conduction path, and being able to achieve rapid heat conduction, thereby solving the problem of reduced heat conduction effect of the heat spreader 100 in the related art. At the same time, the use of the first preform 10 and the second preform 20 can simplify the installation steps of the heat spreader 100 and improve the installation efficiency.

[0124] In some embodiments, a working fluid is provided in the inner cavity, and the working fluid is used for heat exchange. It should be noted that the type of the working fluid in the above embodiments is not limited and can be selected according to the actual application. For example, the working fluid can be lubricating oil, water, cold air, alcohol compounds, etc.

[0125] In some embodiments, see Figure 4 and Figure 5 The first plate body 11 is the lower shell plate, the second plate body 21 is the upper shell plate, the first plate body 11 is formed with a first accommodating groove 111, the opening of the first accommodating groove 111 is toward the second plate body 21, the second plate body 21 is formed with a second accommodating groove 211, the opening of the second accommodating groove 211 is toward the first plate body 11, the upper shell plate and the lower shell plate are welded and connected so that the first accommodating groove 111 and the second accommodating groove 211 are connected to form an inner cavity.

[0126] In some embodiments, the first accommodating groove 111 is surrounded by a first connecting wall 112 on the outside of the groove wall, and the second accommodating groove 211 is surrounded by a second connecting wall 212 on the outside of the groove wall; the second accommodating groove 211 is surrounded by a second connecting wall 212 on the outside of the groove wall; specifically, the edge of the first accommodating groove 111 is folded outward to form the first connecting wall 112, and the edge of the second accommodating groove 211 is folded outward to form the second connecting wall 212. The first connecting wall 112 corresponds to the second connecting wall 212. In the actual welding process, the first plate body 11 and the second plate body 21 are welded and connected by welding the first connecting wall 112 and the second connecting wall 212.

[0127] In this embodiment, the first plate body 11 and the second plate body 21 are welded by diffusion welding. During the welding process, the first plate body 11 and the second plate body 21 are placed in a graphite jig. The first connecting wall 112 and the second connecting wall 212 are changed by the high temperature and high pressure environment, so as to combine to form a new compound, and the first plate body 11 and the second plate body 21 are welded together. Such a setting can not only improve the structural strength of the heat spreader 100, but also improve the corrosion resistance of the heat spreader 100, while ensuring air tightness.

[0128] In some embodiments, see Figure 4 The wire mesh 12 is fixedly connected to the side of the first plate body 11 facing the second plate body 21. In actual operation, the wire mesh 12 is generally connected to the first plate body 11 first, and the first plate body 11 and the second plate body 21 are welded and connected by the first connecting wall 112 and the second connecting wall 212. Therefore, in order to avoid interference with each other, in this embodiment, the wire mesh 12 is arranged in the first accommodating groove 111 and is fixedly connected to the bottom of the first accommodating groove 111.

[0129] In some embodiments, the screen 12 is attached to the bottom of the first receiving tank 111 through a first connecting medium; the specific type of the first connecting medium is not limited and can be selected according to actual conditions. For example, in some embodiments, the screen 12 is attached to one side of the first plate body 11 through alcohol; in other embodiments, the screen 12 is attached to one side of the first plate body 11 through deionized water. Using alcohol or ultrapure water as the first connecting medium can prevent the first connecting medium from contaminating the screen 12. In the subsequent sintering step, alcohol and ultrapure water will evaporate with the temperature and will not produce residue, thereby avoiding contamination of the screen 12.

[0130] In some embodiments, the wire mesh 12 is welded to the bottom of the first receiving groove 111 .

[0131] In some embodiments, see Figure 5 The absorbent core 22 is fixedly connected to the side of the second plate body 21 facing the first plate body 11. In actual operation, the absorbent core 22 is generally connected to the second plate body 21 first, and then the first plate body 11 and the second plate body 21 are welded and connected through the first connecting wall 112 and the second connecting wall 212. Therefore, in order to avoid interference between each other, in this embodiment, the absorbent core 22 is arranged in the second accommodating groove 211 and is fixedly connected to the bottom of the second accommodating groove 211.

[0132] In some embodiments, the wick 22 is attached to the bottom of the second receiving tank 211 through a second connecting medium; the specific type of the second connecting medium is not limited and can be selected according to actual conditions. For example, in some embodiments, the wick 22 is attached to one side of the second plate body 21 through alcohol; in other embodiments, the wick 22 is attached to one side of the second plate body 21 through deionized water. Using alcohol or ultrapure water as the second connecting medium can prevent the first connecting medium from contaminating the screen 12. In the subsequent sintering step, alcohol and ultrapure water will evaporate with the temperature and will not produce residue, thereby avoiding contamination of the screen 12.

[0133] In some embodiments, the wick 22 is welded to the bottom of the second receiving groove 211 .

[0134] In some embodiments, in order to improve the corrosion resistance of heat spreader 100, a protective layer is often provided on the outside of heat spreader 100. The protective layer is wrapped around the outside of heat spreader 100 to isolate heat spreader 100 from the outside world, prevent heat spreader 100 from being corroded, and increase the service life of heat spreader 100. More specifically, the protective layer includes any one of a nickel layer, a chromium layer, and a zinc layer. The nickel layer, the chromium layer, and the zinc layer have poor activity and basically do not react with other substances. The protective layer is wrapped around the outside of heat spreader 100 to protect heat spreader 100 and form a dense passivation film on the outer surface of heat spreader 100, which effectively prevents heat spreader 100 from reacting with other substances, thereby extending the service life of heat spreader 100.

[0135] The present invention further provides a battery, which includes at least one of the above-mentioned vapor chamber 100. The specific structure of the vapor chamber 100 refers to the above-mentioned embodiment. Since the present battery adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0136] Specifically, in one embodiment, the battery further includes a battery housing, and the battery housing is composed of a heat spreader 100, that is, the six sides of the battery housing can be composed of a heat spreader 100, so that it can save space and improve space utilization. It should be noted that the six heat spreaders 100 can be interconnected or not, and the selection can be made according to the actual situation.

[0137] Generally, the battery shell has six shell surfaces, and the heat spreader 100 can be applied to any shell surface of the battery shell, or to multiple shell surfaces at the same time. For example, the heat spreader 100 is applied to two adjacent shell surfaces of the battery shell. Specifically, the heat spreader 100 is L-shaped, the first section of the heat spreader 100 corresponds to one shell surface, and the second section of the heat spreader 100 corresponds to another shell surface, so that the heat spreader 100 can serve as two shell surfaces of the battery shell. The specific selection can be based on the size of the battery module.

[0138] In some other embodiments, the heat spreader 100 can also be used inside a battery, where the battery includes a battery shell and a core pack group, which is installed in the battery shell. The core pack group includes at least one core pack. Specifically, the first section of the heat spreader 100 corresponds to one side of the core pack, and the second section of the heat spreader 100 corresponds to the other side of the core pack. Furthermore, in order to even out the temperatures of adjacent core packs, a heat spreader 100 can also be arranged between two adjacent core packs to achieve temperature balance on multiple sides, thereby transferring the temperature of the high-temperature part to the low-temperature part directly cooled by the cooling plate, thereby improving the cooling efficiency and avoiding thermal runaway.

[0139] In some other embodiments, the heat spreader 100 can also be used in a battery module, which includes multiple batteries. The first section of the heat spreader 100 corresponds to one side of the battery casing, and the second section of the heat spreader 100 corresponds to the other side of the battery casing. Furthermore, in order to equalize the temperature of adjacent batteries, a heat spreader 100 can also be set between two adjacent batteries to achieve temperature balance on multiple sides, thereby transferring the temperature of the high-temperature part to the low-temperature part for direct cooling by the cooling plate.

[0140] The present invention also provides a battery pack, which includes the above-mentioned battery. The specific structure of the battery is referred to the above-mentioned embodiment. Since the present battery pack adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0141] In addition, the present invention also proposes an electric device, which includes the above-mentioned battery pack. The specific structure of the battery pack refers to the above-mentioned embodiment. Since the electric device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0142] It is understood that electrical equipment includes but is not limited to electric toys, electric tools, battery cars, cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles and spacecrafts, etc. Cars can be fuel cars, gas cars and new energy cars.

[0143] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing a vapor chamber, characterized in that: The following steps are involved: Assembling a wire mesh (12) on one side of a first plate (11) to prepare a first preform (10); Assembling the liquid absorbent core (22) on the side of the second plate body (21) facing the first plate body (11) to prepare a second preform (20); The side of the first preform (10) having the wire mesh (12) is mounted on the side of the second preform (20) having the liquid absorbent core (22) to prepare a heat spreader (100).

2. The method for preparing a vapor chamber according to claim 1, characterized in that: The step of assembling the wire mesh (12) on one side of the first plate (11) to prepare the first preform (10) comprises the following steps: The screen (12) is adhered to one side of the first plate (11) by alcohol; or, The wire mesh (12) is adhered to one side of the first plate (11) by deionized water; or, The wire mesh (12) is welded to one side of the first plate (11).

3. The method for preparing a vapor chamber according to claim 1, characterized in that: The step of assembling the absorbent core (22) on the side of the second plate (21) facing the first plate (11) to prepare the second preform (20) comprises the following steps: The liquid wick (22) is adhered to the side of the second plate (21) facing the first plate (11) by alcohol; or, The liquid absorbent core (22) is attached to the side of the second plate body (21) facing the first plate body (11) through deionized water; or, The liquid absorbent core (22) is welded to a side of the second plate body (21) facing the first plate body (11).

4. The method for preparing a vapor chamber according to claim 1, characterized in that: In the step of mounting the side of the first preform (10) having the wire mesh (12) on the side of the second preform (20) having the wick (22) to prepare the heat spreader (100), the first preform (10) and the second preform (20) are fixed by diffusion welding.

5. The method for preparing a vapor chamber according to claim 4, characterized in that: The step of mounting the side of the first preform (10) having the wire mesh (12) on the side of the second preform (20) having the liquid wick (22) to prepare the vapor chamber (100) comprises the following steps: The first preform (10) and the second preform (20) that have been installed are placed on a graphite jig, and the graphite jig is placed in a diffusion welding furnace to heat and pressurize.

6. The method for preparing a vapor chamber according to claim 5, characterized in that: The height of the receiving portion in the graphite jig is H1, the sum of the thicknesses of the first preform (10) and the second preform (20) is H2, and 0.03≤H1 / H2≤0.

05.

7. The method for preparing a vapor chamber according to any one of claims 1 to 6, characterized in that: After the step of mounting the side of the first preform (10) having the wire mesh (12) on the side of the second preform (20) having the liquid absorbent core (22) to prepare the vapor chamber (100), the method further comprises the following steps: An air tightness test is performed on the vapor chamber (100).

8. The method for preparing a vapor chamber according to claim 7, characterized in that: After the step of performing an air tightness test on the vapor chamber (100), the following steps are also included: The heat spreader (100) is subjected to annealing, vacuuming and water bath treatment in sequence.

9. The method for preparing a vapor chamber according to claim 8, characterized in that: The steps of sequentially annealing, vacuumizing and water bathing the heat spreader (100) comprise the following steps: Under the protection of inert gas, placing the heat spreader (100) in an annealing furnace for annealing; Under the protection of inert gas, injecting a working fluid into the heat sink (100) after annealing; Performing a vacuum sealing process on the heat diffusion plate (100) filled with the working fluid; The heat spreader (100) is subjected to a water bath treatment.

10. The method for preparing a vapor chamber according to claim 7, characterized in that: After the steps of sequentially annealing, vacuuming and water bathing the vapor chamber (100), the following steps are also included: Connecting the vapor chamber (100) to a rat-tail tube, and heating the vapor chamber (100) so that the gas in the vapor chamber (100) is discharged into the rat-tail tube; The heat spreader (100) is sealed and tail-cut.

11. A heat spreader (100), characterized in that: The heat spreader (100) is manufactured by the method for manufacturing a heat spreader according to any one of claims 1 to 10, wherein the heat spreader (100) comprises: A first preform (10) comprises a first plate (11) and a wire mesh (12), wherein the wire mesh (12) is arranged on one side of the first plate (11); A second preform (20) is arranged opposite to the first preform (10) and forms a closed inner cavity with the first preform (10), the second preform (20) comprising a second plate (21) and a liquid absorbent core (22), the liquid absorbent core (22) being arranged on a side of the second plate (21) facing the first plate (11); The liquid wick (22) and the wire mesh (12) are located in the inner cavity, and a working fluid is provided in the inner cavity.

12. The vapor chamber (100) according to claim 11, characterized in that: The first plate body (11) is formed with a first receiving groove (111), the opening of the first receiving groove (111) faces the second plate body (21), a first connecting wall (112) surrounds the groove wall of the first receiving groove (111), and the wire mesh (12) is arranged in the first receiving groove (111) and fixedly connected to the groove bottom of the first receiving groove (111); The second plate body (21) is formed with a second receiving groove (211), the opening of the second receiving groove (211) faces the first plate body (11), the groove wall of the second receiving groove (211) is surrounded by a second connecting wall (212), and the absorbent core (22) is arranged in the second receiving groove (211) and is fixedly connected to the groove bottom of the second receiving groove (211).

13. The vapor chamber (100) according to claim 12, characterized in that: The wire mesh (12) is attached to the bottom of the first containing groove (111) via a first connecting medium; or, The wire mesh (12) is welded to the bottom of the first containing groove (111); or, The liquid absorbent core (22) is attached to the bottom of the second containing groove (211) via a second connecting medium; or, The liquid absorbing core (22) is welded to the bottom of the second containing groove (211).

14. A battery, characterized in that: It comprises the heat sink (100) as described in any one of claims 11 to 13.

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