Large-area ultrathin vapor chamber and battery thermal management system
By designing a large-area ultrathin heat spreader structure, the problems of increased processing difficulty and cost were solved, achieving efficient and economical heat dissipation of energy storage batteries, with good temperature uniformity and responsiveness.
Patent Information
- Application Number
- CN202423069285.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-12
AI Technical Summary
With the expansion of the design area, the existing ultra-thin heat spreader has increased difficulty and cost in processing the internal support structure, making it difficult to effectively meet the large-area heat dissipation requirements of energy storage batteries.
It adopts a large-area ultra-thin heat spreader structure, including a cover plate, a bottom plate, a liquid absorber core and a support structure. The support structure is a flat wire mesh with a steam channel inside. The phase change working fluid evaporates in the heat source area and condenses in the heat dissipation and condensation area. The steam channel extends from the heat source area to the heat dissipation and condensation area. The support structure and the liquid absorber core are made of copper, aluminum or nickel materials and are connected by high-temperature sintering and brazing.
It improves processing efficiency and economy, enhances the working fluid phase change process and cycle efficiency, ensures efficient heat dissipation of large-area energy storage batteries, has strong mechanical load-bearing capacity and vapor flow diffusion, good temperature uniformity, and strong responsiveness to different heat generation ranges.
Smart Images
Figure CN223525638U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a heat dissipation component technical field, concretely relates to a large area ultrathin uniform heating plate and battery heat management system. BACKGROUND
[0002] The rapid progress of new energy technology promotes the development of energy storage industry, and with the increase of energy density of energy storage battery, the safety risk brought by battery heat generation also increases exponentially, especially under the development trend of high integration of energy storage equipment. The ultrathin uniform heating plate relies on the flow and phase change of internal vapor-liquid working medium to transfer heat quickly, which can transfer the heat of battery in a compact space and ensure the good uniformity of temperature on the two-dimensional plane, so as to ensure the thermal safety of energy storage battery.
[0003] The current ultrathin uniform heating plate heat dissipation area is mostly suitable for small size electronic devices such as mobile phone CPU, and the sintered plane wire mesh is used as the return flow and phase change of the working medium in the liquid absorption core. The column and groove etched or punched on the thin plate cavity are used as the support structure of the internal steam space. However, when the ultrathin uniform heating plate is used for energy storage battery heat dissipation, the design area is expanded, and the difficulty and cost of processing the internal support structure are increased. UTILITY MODEL CONTENT
[0004] In view of the technical problems existing in the prior art, one object of the utility model is to provide a large area ultrathin uniform heating plate.
[0005] Another object of the utility model is to provide a battery heat management system.
[0006] In order to achieve the above object, the utility model adopts the following technical scheme: a large area ultrathin uniform heating plate, comprising a cover plate, a bottom plate, a liquid absorption core and a support structure, a cavity with negative pressure state is formed between the cover plate and the bottom plate, and the cavity is filled with phase change working medium; the liquid absorption core and the support structure are located in the cavity, the support structure adopts plane wire mesh and is used for supporting the cavity, and the support structure is provided with steam channels for steam flow; the cavity comprises a heat source area and a heat dissipation condensation area, the phase change working medium evaporates in the heat source area and condenses in the heat dissipation condensation area, and the steam channels extend from the heat source area to the heat dissipation condensation area.
[0007] After adopting this structure, the uniform heating plate has high processing efficiency and economy, the two ends of the steam channel start from the inside of the heat source area and the heat dissipation condensation area respectively, which is beneficial to strengthen the phase change process of the working medium and the circulation efficiency of the vapor-liquid working medium, and improve the heat transfer performance of the ultrathin uniform heating plate; the support structure is provided with the hollow steam channels, so that the reasonable and reliable internal design can ensure the mechanical bearing and the flow diffusion of steam, so as to achieve the effect of high efficiency heat dissipation for large area energy storage battery.
[0008] As a kind of preferred, steam passage is rectangular, is formed by die cutting, one end of steam passage is located in heat source area, the other end is located in heat dissipation condensing area.
[0009] As a kind of preferred, the material of support structure is copper, aluminum or nickel, the mesh hole diameter of support structure is greater than 500 μm, the number of steam passage is multiple, the spacing between adjacent steam passages is greater than 3 times the sum of mesh hole diameter and wire diameter.
[0010] As a kind of preferred, support structure is treated by hydrophobic treatment, and the wick is treated by hydrophilic treatment.
[0011] As a kind of preferred, the wick adopts plane wire mesh, and the mesh hole diameter of the wick is less than 10 μm.
[0012] As a kind of preferred, the wick and the support structure are both woven by copper wires, and the wire diameter of the copper wire used by the wick is less than the wire diameter of the copper wire used by the support structure.
[0013] As a kind of preferred, the wick and the support structure are stacked in the thickness direction, and the sum of the thicknesses of the wick and the support structure is equal to the thickness of the cavity.
[0014] As a kind of preferred, the width of the steam passage gradually expands from the heat source area to the heat dissipation condensing area.
[0015] A preparation method of a large-area ultra-thin vapor chamber, comprising the following steps,
[0016] S1, a cover plate and a bottom plate are made by punching, etching or machining forming;
[0017] S2, the outer contour of the wick and the support structure, and the steam passage in the support structure are processed by die cutting;
[0018] S3, the wick, the support structure and the bottom plate are placed in a reducing atmosphere and connected by high-temperature sintering, and then the part is connected with the cover plate by brazing process;
[0019] S4, phase change working medium is injected into the cavity between the cover plate and the bottom plate, and degassing operation is carried out to ensure the vacuum degree of the inner cavity, and then sealing treatment is carried out.
[0020] A battery thermal management system adopts the large-area ultra-thin vapor chamber, comprising a plurality of energy storage batteries, and the heat source area of the large-area ultra-thin vapor chamber is attached to the energy storage battery; the large-area ultra-thin vapor chamber is vertically placed between adjacent energy storage batteries, or horizontally placed at the bottom of the energy storage battery.
[0021] Overall, the present application has the following advantages:
[0022] The liquid absorbing core and the supporting structure in the utility model are both plane wire meshes, have certain flexibility and controllable thickness, can adapt to extrusion and bending and keep the integrity of the structure, and the processing technology adopted has higher efficiency and relatively lower cost.
[0023] The supporting structure of the utility model is a plane wire mesh with porous characteristics, and the woven structure can enhance the heat transfer in the thickness direction of the ultra-thin vapor chamber.
[0024] The strip-shaped hollow structure is designed and processed in the supporting plane wire mesh to become a low-pressure-drop steam flow channel, which is beneficial to the efficient diffusion of steam, thereby ensuring the temperature uniformity on the large-area ultra-thin vapor chamber plane, and the shape of the flow channel is formed by blanking, and the flow channel shape also has strong flexibility in design.
[0025] The utility model is easy to install and does not need maintenance, has responsiveness to the change of heat input, can cope with the heat dissipation of the energy storage battery in different heat generation intervals, keeps the battery in the suitable working temperature range under the variable working condition, and the temperature difference of the battery is lower than the limit requirement. BRIEF DESCRIPTION OF DRAWINGS
[0026] Figure 1 It is an explosion view of the large-area ultra-thin vapor chamber.
[0027] Figure 2 It is a structure schematic view of the sintered liquid absorbing core and supporting structure.
[0028] Figure 3 It is a structure schematic view of the brazed bottom plate, liquid absorbing core and supporting structure.
[0029] Figure 4 It is an application schematic view of the double-sided heat dissipation of the ultra-thin vapor chamber to the energy storage battery in the second embodiment.
[0030] Figure 5 It is an application schematic view of the single-sided heat dissipation of the ultra-thin vapor chamber to the energy storage battery in the third embodiment.
[0031] 1 is a bottom plate, 2 is a liquid absorbing core, 3 is a supporting structure, 4 is a steam channel, 5 is a cover plate, 6 is a liquid injection pipe, A is a heat source area, and B is a heat dissipation condensation area. DETAILED DESCRIPTION
[0032] The utility model will be further explained in detail in combination with the drawings and specific embodiments.
[0033] Embodiment one
[0034] As Figures 1 to 3As shown, a large-area ultra-thin vapor chamber includes a cover plate 5, a bottom plate 1, a wick 2 and a support structure 3. The cover plate 5 and the bottom plate 1 form a cavity with a negative pressure state between them, and the cavity is filled with a phase change working medium. The wick 2 and the support structure 3 are both located in the cavity, the support structure 3 adopts a plane wire mesh and is used for supporting the cavity, and the support structure 3 is provided with a steam channel 4 for steam flow. The cavity includes a heat source area A and a heat dissipation condensation area B. The phase change working medium evaporates in the heat source area A and condenses in the heat dissipation condensation area B. The steam channel 4 extends from the heat source area A to the heat dissipation condensation area.
[0035] The wick 2 and the support structure 3 are combined by sintering and fixed on the bottom plate 1. The cover plate 5 and the bottom plate 1 form the cavity between them by welding. The overall thickness of the large-area ultra-thin vapor chamber is 0.95-1 mm. The bottom plate 1 and the cover plate 5 are made of copper alloy material and have a thickness of 0.5 mm. A 0.35 mm deep groove is formed by chemical etching. The groove between the bottom plate and the cover plate forms the cavity. The phase change working medium can be deionized water, acetone, ethanol or the like. After the phase change working medium evaporates into steam in the wick 2, the steam flows and diffuses in the porous pores of the plane wire mesh. The hollowed-out part formed by cutting in the plane wire mesh becomes the main steam channel 4 to ensure the mechanical bearing and the flow and diffusion of the steam.
[0036] The steam channel 4 is in the shape of a long strip and is formed by die cutting. One end of the steam channel 4 is located in the heat source area A, and the other end is located in the heat dissipation condensation area.
[0037] The material of the support structure 3 is copper, aluminum or nickel. The mesh pore diameter of the support structure 3 is greater than 500 μm. The number of the steam channels 4 is multiple. The spacing between adjacent steam channels 4 is greater than 3 times the sum of the mesh pore diameter and the wire diameter. In this way, the structural integrity of the plane wire mesh can be ensured.
[0038] The support structure 3 is subjected to hydrophobic treatment, and the wick 2 is subjected to hydrophilic treatment. Existing hydrophobic treatment and hydrophilic treatment processes can be used. The support structure 3 subjected to hydrophobic treatment can reduce the adsorption of the liquid phase change working medium to the plane wire mesh, which is conducive to improving the flow and diffusion of the steam in the porous structure of the plane wire mesh and improving the temperature uniformity in the plane of the ultra-thin vapor chamber. The wick 2 subjected to hydrophilic treatment can ensure good capillary performance.
[0039] The wick 2 adopts a plane wire mesh, and the mesh pore diameter of the wick is less than 10 μm.
[0040] The wicking core 2 and the support structure 3 are both woven by copper wires, and the wire diameter of the copper wires used in the wicking core 2 is smaller than that of the copper wires used in the support structure 3. Specifically, the wicking core 2 uses a plane wire mesh with a small wire diameter of 0.05 mm, and the mesh hole diameter of the plane wire mesh is 77 μm and the thickness is 0.2 mm. The plane wire mesh is woven by copper wires with a large wire diameter of 0.25 mm, and the mesh hole diameter is 1.02 mm.
[0041] The wicking core 2 and the support structure 3 are arranged in a stacked manner in the thickness direction, and the sum of the thicknesses of the wicking core 2 and the support structure 3 is equal to the thickness of the cavity.
[0042] The width of the vapor channel 4 gradually expands from the heat source area A to the heat dissipation and condensation area.
[0043] The vapor channel 4 formed by the hollowing of the support structure 3 starts in the heat source area A and the heat dissipation and condensation area B. The phase change working medium is mainly evaporated in the heat source area A to form steam, and the steam flows through the pores of the plane wire mesh and the vapor channel 4 to the heat dissipation and condensation area B. The vapor channel 4 can increase the flow speed of the steam in the channel, and the gradually expanding vapor channel 4 can appropriately reduce the flow speed of the steam to avoid the formation of backflow in the heat dissipation and condensation area B, which is beneficial to reduce the pressure drop level of the steam and improve the heat diffusion of the steam. The steam is condensed in the heat dissipation and condensation area B due to cooling and the heat is taken away by the external cooling mode, thereby completing the rapid transfer of heat from the heat source. The condensed phase change working medium returns to the heat source area A under the capillary action of the wicking core 2 to continue participating in the vapor-liquid circulation.
[0044] The preparation method of the above large-area ultra-thin uniform heating plate includes the following steps,
[0045] S1, the cover plate 5 and the bottom plate 1 are made by punching, etching or machining forming, including the recessed cavity and the liquid injection port thereon;
[0046] S2, the outer contour of the wicking core 2 and the support structure 3, and the vapor channel 4 in the support structure 3 are processed by die cutting;
[0047] S3, the wicking core 2, the support structure 3 and the bottom plate 1 are placed in a reducing atmosphere and connected by high temperature sintering, and then the part is connected with the cover plate 5 by brazing process. Specifically, the wicking core 2, the support structure 3 and the thin bottom plate 1 are sintered and combined in a vacuum furnace at 780 DEG C in a reducing atmosphere, the sintered thin cover plate 5 and the thin bottom plate 1 are brazed in a vacuum furnace at 750 DEG C, the solder is melted to seal and combine the cover plate 5 and the bottom plate 1, the liquid injection pipe 6 is inserted into the liquid injection port and welded by high frequency welding.
[0048] S4, injecting phase change working medium into the cavity between the cover plate 5 and the bottom plate 1, and performing degassing operation to ensure the vacuum degree of the cavity, and then performing sealing treatment. The degassing operation can be performed by vacuumizing, and the liquid injection pipe 6 is continuously shortened and sealed during the process, and finally the liquid injection port is sealed by argon arc welding.
[0049] Embodiment two
[0050] As shown in Figure 4 , a battery thermal management system using a large-area ultra-thin vapor chamber of embodiment one, including a plurality of energy storage batteries, the heat source area A of the large-area ultra-thin vapor chamber is attached to the energy storage batteries; the large-area ultra-thin vapor chamber is vertically placed between adjacent energy storage batteries. The heat generated by the energy storage batteries enters the ultra-thin vapor chamber through the two attached planes of the ultra-thin vapor chamber, and the vapor flow channel 4 formed by the hollow starts from the battery-attached area and ends at the heat dissipation and condensation area B.
[0051] Embodiment three
[0052] As shown in Figure 5 , a battery thermal management system using a large-area ultra-thin vapor chamber of embodiment one, including a plurality of energy storage batteries, the heat source area A of the large-area ultra-thin vapor chamber is attached to the energy storage batteries; the large-area ultra-thin vapor chamber is horizontally placed at the bottom of the energy storage batteries. The heat generated by the energy storage batteries enters the ultra-thin vapor chamber through the attached plane of the ultra-thin vapor chamber, and the vapor flow channel 4 formed by the hollow starts from the battery-attached area and can end at the heat dissipation and condensation area B and the boundary.
[0053] The above embodiments are the preferred embodiments of the utility model, but the embodiments of the utility model are not limited by the above embodiments, any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the utility model, should be equivalent replacement methods, all included in the protection scope of the utility model.
Claims
1. A large area ultra-thin vapor chamber, characterized in that: The phase change heat sink comprises a cover plate, a bottom plate, a wick and a support structure, a cavity with a negative pressure state is formed between the cover plate and the bottom plate, and a phase change working medium is filled in the cavity; the wick and the support structure are both located in the cavity, the support structure is a plane wire mesh and is used for supporting the cavity, and steam channels for steam flow are formed on the support structure; the cavity comprises a heat source area and a heat dissipation condensation area, the phase change working medium evaporates in the heat source area and condenses in the heat dissipation condensation area, and the steam channels extend from the heat source area to the heat dissipation condensation area.
2. A large area ultra-thin vapor chamber according to claim 1, wherein: The steam channels are in the shape of oblong strips and are formed by die cutting, one end of the steam channels is located in the heat source area, and the other end of the steam channels is located in the heat dissipation condensation area.
3. A large area ultra-thin vapor chamber according to claim 1, wherein: The material of the support structure is copper, aluminum or nickel, the mesh hole diameter of the support structure is greater than 500 μm, the number of the steam channels is multiple, and the spacing between adjacent steam channels is greater than 3 times the sum of the mesh hole diameter and the wire diameter.
4. A large area ultra-thin vapor chamber according to claim 1, wherein: The support structure is subjected to hydrophobic treatment, and the wick is subjected to hydrophilic treatment.
5. A large area ultra-thin vapor chamber according to claim 1, wherein: The wick is a plane wire mesh, and the mesh hole diameter of the wick is less than 10 μm.
6. A large area ultra-thin vapor chamber according to claim 5, wherein: The wick and the support structure are both woven by copper wires, and the wire diameter of the copper wires used for the wick is less than the wire diameter of the copper wires used for the support structure.
7. A large area ultra-thin vapor chamber according to claim 1, wherein: The wick and the support structure are arranged in a stacking mode in the thickness direction, and the sum of the thicknesses of the wick and the support structure is equal to the thickness of the cavity.
8. A large area ultra-thin vapor chamber according to claim 1, wherein: From the heat source area to the heat dissipation condensation area, the width of the steam channels gradually increases.
9. A battery thermal management system employing a large-area ultra-thin vapor chamber of any one of claims 1-8, wherein: The large-area ultra-thin vapor chamber is vertically placed between adjacent energy storage batteries or horizontally placed at the bottom of the energy storage batteries. The large-area ultra-thin vapor chamber is vertically placed between adjacent energy storage batteries or horizontally placed at the bottom of the energy storage batteries.