A kind of hot plate and battery assembly

Abstract

The application relates to a heat plate and a battery assembly, the heat plate comprising an L-shaped shell and a one-way valve for transmitting a gaseous working medium, the L-shaped shell having an L-shaped sealed cavity in the L-shaped shell, the L-shaped shell comprising a first cover plate and a second cover plate, the first cover plate comprising a first horizontal plate and a first vertical plate connected with the first horizontal plate to form an L shape, the one-way valve being located in the sealed cavity and arranged on the first cover plate, wherein an inlet end of the one-way valve is arranged on an inner wall of the first vertical plate, and an outlet end of the one-way valve extends along the first vertical plate, passes through a connecting position of the first vertical plate and the first horizontal plate and reaches an inner wall of the first horizontal plate. The application transmits the gaseous working medium by arranging the one-way valve at a bending area of the L-shaped shell, and the directional action of the one-way valve can accelerate the gas flow at the bending area, so that the heat conduction capacity of the heat plate is improved.

Description

Technical Field

[0001] This application relates to the field of heat dissipation technology, and in particular to a heat spreader and battery assembly. Background Technology

[0002] Whether it's a hybrid or pure electric vehicle, the battery is a crucial component and the primary power source. Therefore, battery performance and lifespan largely determine the reliability of the electric vehicle. During charging and discharging, batteries accumulate heat. If this heat cannot be dissipated in time, it can easily lead to thermal runaway. Thermal runaway causes a rapid increase in battery temperature, which can, in severe cases, lead to vehicle fires or explosions, posing significant risks to personal safety and property.

[0003] To effectively dissipate heat from batteries, heat spreaders are typically installed on the battery casing to quickly dissipate heat. Heat spreaders generally come in two types: flat and L-shaped. L-shaped heat spreaders can conduct heat from the battery to the bottom for better heat dissipation. However, compared to flat heat spreaders, L-shaped heat spreaders, due to their bends, experience a decrease in heat transfer rate. Calculations show that the thermal conductivity of L-shaped heat spreaders decreases by approximately 55% due to the bends, affecting their thermal conductivity and reducing the battery's heat dissipation effect. Summary of the Invention

[0004] Therefore, it is necessary to provide a heat spreader and battery assembly to address the above-mentioned technical problems, which can accelerate the gas flow in the bending area of ​​the heat spreader and improve the heat conduction capacity of the heat spreader.

[0005] In a first aspect, this application provides a heat spreader, including an L-shaped shell and a one-way valve for transferring a gaseous working fluid. The L-shaped shell includes a first cover plate and a second cover plate. The first cover plate includes a first horizontal plate and a first vertical plate connected to the first horizontal plate to form an L-shape. The second cover plate includes a second horizontal plate and a second vertical plate connected to the second horizontal plate to form an L-shape. The edges of the first horizontal plate and the second horizontal plate are sealed together to form a condensation section of the L-shaped shell. The edges of the first vertical plate and the second vertical plate are sealed together to form an evaporation section of the L-shaped shell. A first cavity is provided between the first horizontal plate and the second horizontal plate. A second cavity is provided between the first vertical plate and the second vertical plate. The first cavity and the second cavity communicate with each other to form an L-shaped sealed cavity.

[0006] The one-way valve is located in the sealed cavity and is disposed on the first cover plate, wherein the inlet end of the one-way valve is disposed on the inner wall of the first vertical plate, and the outlet end of the one-way valve extends along the first vertical plate and through the connection between the first vertical plate and the first horizontal plate to the inner wall of the first horizontal plate.

[0007] Optionally, the one-way valve extends on the first vertical plate for three-quarters of the height of the first vertical plate, and extends on the first horizontal plate for three-quarters of the width of the first horizontal plate.

[0008] Optionally, it also includes N liquid-absorbing cores located in the sealed cavity, where N≥2, and the N liquid-absorbing cores extend from the evaporation section to the condensation section;

[0009] The N absorbent cores are arranged sequentially along the length of the L-shaped shell, wherein the position of the i-th absorbent core is at [1+(i-1)] / 2N of the length of the L-shaped shell.

[0010] Optionally, the absorbent core has a width of 1.9-2.3 mm, a thickness of 0.2 mm, a single wire diameter of 0.05-0.1 mm, a mesh size of 200, and is made of T2 copper.

[0011] Optionally, the side of the one-way valve away from the first cover plate abuts against the second cover plate to support the sealing cavity.

[0012] Optionally, the sealed cavity is further provided with a plurality of support columns and a plurality of support bars for supporting the sealed cavity; each of the support bars extends from the evaporation section to the condensation section;

[0013] The multiple support bars are arranged along the length of the L-shaped shell, with a spacing of 2mm between adjacent support bars and a width of 0.4mm for each support bar.

[0014] Optionally, the device also includes a wire mesh located within the sealed cavity, the wire mesh being disposed in the evaporation section or extending from the evaporation section to the condensation section, the wire mesh having a thickness of 0.1-0.17 mm and a mesh size of 250 mesh.

[0015] Optionally, the L-shaped housing is made of copper, copper alloy, aluminum, aluminum alloy or stainless steel, and the outer surface of the L-shaped housing is treated with insulating spraying or electroplating.

[0016] Secondly, this application also provides a battery assembly, including a single cell and at least one heat spreader, wherein the heat spreader is the heat spreader described in any of the above claims;

[0017] The single cell includes a battery casing and at least one core pack disposed within the battery casing. The heat spreader is disposed within the battery casing. The core pack includes a top surface for mounting the electrode post, a bottom surface opposite to the top surface, and a side surface located between the top and bottom surfaces. The condensation portion of the L-shaped casing of each heat spreader is attached to the bottom surface of one core pack, and the evaporation portion of each L-shaped casing is attached to the side surface of one core pack.

[0018] Optionally, there are multiple core packages and heat spreaders, with the evaporation sections of the L-shaped shells of every two heat spreaders attached together and the condensation sections extending in opposite directions.

[0019] Optionally, the evaporation section is fitted to the side of the core package with the largest area.

[0020] The battery assembly also includes a liquid cooling plate, which is attached to the bottom of the individual battery cell.

[0021] The above describes a heat spreader and battery assembly. The heat spreader includes an L-shaped housing and a one-way valve for transferring a gaseous working fluid. The L-shaped housing includes a first cover plate and a second cover plate. The first cover plate includes a first horizontal plate and a first vertical plate connected to the first horizontal plate to form an L-shape. The second cover plate includes a second horizontal plate and a second vertical plate connected to the second horizontal plate to form an L-shape. The edges of the first horizontal plate and the second horizontal plate are sealed together to form a condensation section of the L-shaped housing. The edges of the first vertical plate and the second vertical plate are sealed together to form an evaporation section of the L-shaped housing. A first cavity is provided between the first horizontal plate and the second horizontal plate, and a second cavity is provided between the first vertical plate and the second vertical plate. The cavity, the first cavity and the second cavity are connected to form an L-shaped sealed cavity; the one-way valve is located in the sealed cavity and is disposed on the first cover plate, wherein the inlet end of the one-way valve is disposed on the inner wall of the first vertical plate, and the outlet end of the one-way valve extends along the first vertical plate and through the connection between the first vertical plate and the first horizontal plate to the inner wall of the first horizontal plate, wherein the connection between the first vertical plate and the first horizontal plate is also the bending area of ​​the L-shaped shell. That is, this application uses a one-way valve in the bending area of ​​the L-shaped shell to transfer gaseous working fluid. The directional effect of the one-way valve can accelerate the gas flow in the bending area, thereby improving the heat conduction capacity of the heat spreader. Attached Figure Description

[0022] Figure 1 A schematic diagram of a heat spreader provided in this application;

[0023] Figure 2 A schematic diagram of the structure of the first cover plate of the heat spreader provided in this application combined with the one-way valve;

[0024] Figure 3 A schematic diagram of the structure of the wire mesh and the second vertical plate provided in this application;

[0025] Figure 4 An exploded view of the battery assembly provided in this application;

[0026] Figure 5 This is a schematic diagram of the battery assembly provided in this application.

[0027] The reference numerals in the embodiments of this application are explained as follows:

[0028] Heat spreader: 100; L-shaped housing: 10; First cover plate: 11; First horizontal plate: 111; First vertical plate: 112; Second cover plate: 12; Second horizontal plate: 121; Second vertical plate: 122; One-way valve: 20; Liquid suction core: 30; Support column: 40; Support strip: 50; Wire mesh: 60; Battery assembly: 200; Single cell: 70; Battery housing: 701; Cell pack: 702; Top surface: 7021; Side surface: 7022; Connecting piece: 703; Battery cover plate: 704; Liquid cooling plate: 80. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] Existing L-shaped heat spreaders have a bending angle, which causes a decrease in the transfer rate of gaseous working fluid in the bending area, affecting the heat conduction capacity of the heat spreader.

[0031] Based on the above-mentioned shortcomings, this application proposes a heat spreader, which is an L-shaped heat spreader. By setting a one-way valve in the bending area of ​​the L-shaped heat spreader, the gas flow in the bending area can be accelerated by the guiding effect of the one-way valve, thereby improving the heat conduction capacity of the heat spreader.

[0032] This application will now be described in detail.

[0033] See Figure 1 and Figure 2 The heat spreader 100 provided in this application includes an L-shaped housing 10 and a one-way valve 20 for transferring gaseous working fluid. The L-shaped housing 10 includes a first cover plate 11 and a second cover plate 12. The first cover plate 11 includes a first horizontal plate 111 and a first vertical plate 112 connected to the first horizontal plate 111 to form an L shape. The second cover plate 12 includes a second horizontal plate 121 and a second vertical plate 122 connected to the second horizontal plate 121 to form an L shape. That is, both the first cover plate 11 and the second cover plate 12 are L-shaped.

[0034] The L-shaped housing 10 (including the first cover plate 11 and the second cover plate 12) can be made of copper, copper alloy, aluminum, aluminum alloy, stainless steel or other metals or other metal alloys. That is, the L-shaped housing 10 can be made of one of the above materials. For example, stainless steel can be SUS304 or SUS314. In addition, the outer surface of the L-shaped housing 10 can be treated with insulating spraying or electroplating. For example, when it is made of stainless steel, copper can be plated on the outer surface of the stainless steel.

[0035] The edges of the first horizontal plate 111 and the second horizontal plate 121 are sealed together to form the condensation section of the L-shaped shell, and the edges of the first vertical plate 112 and the second vertical plate 122 are sealed together to form the evaporation section of the L-shaped shell. It should be noted that the edges of each horizontal plate and each vertical plate do not include the edges at the connection points between the horizontal and vertical plates. For example, the edge of the first horizontal plate 111 is any edge other than the edge connecting to the first vertical plate 112, i.e., it does not include the edge at the connection point between the first horizontal plate 111 and the first vertical plate 112.

[0036] like Figure 1 As shown, the first cover plate 11 can serve as a support plate for the heat spreader 100, and the second cover plate 12 serves as a cover plate for sealing the support plate. That is, from the perspective of the condensation section of the L-shaped shell 10, the first cover plate 11 is located below and the second cover plate 12 is located above. In other embodiments, the second cover plate 12 can also serve as a support plate for the heat spreader 100, while the first cover plate 11 serves as a cover plate for the heat spreader 100, that is, the first cover plate 11 is located above and the second cover plate 12 is located below.

[0037] A first cavity is formed between the first horizontal plate 111 and the second horizontal plate 121, and a second cavity is formed between the first vertical plate 112 and the second vertical plate 122. The first cavity and the second cavity are connected to form an L-shaped sealed cavity. The sealed cavity is a vacuum cavity, which is filled with a liquid working medium, such as pure water or ethanol.

[0038] The one-way valve 20 is located within the sealed cavity and is disposed on the first cover plate 11. The inlet end of the one-way valve 20 is disposed on the inner wall of the first vertical plate 112, and the outlet end of the one-way valve 20 extends along the first vertical plate 112 and through the connection between the first vertical plate 112 and the first horizontal plate 111 to the inner wall of the first horizontal plate 111. As shown in the figure, the extension direction of the one-way valve 20 on the first vertical plate 112 is the direction of the height H of the first vertical plate 112, and the extension direction on the first horizontal plate 111 is the direction of the width W of the first horizontal plate 111. The connection between the first vertical plate 112 and the first horizontal plate 111 can also be understood as the bending area of ​​the L-shaped shell 10. That is, the one-way valve 20 of this application is located at the bending area of ​​the L-shaped shell 10. Thus, when the evaporation section of the L-shaped shell 10 is heated, causing the liquid working fluid to evaporate into a gaseous working fluid (i.e., heat), the gaseous working fluid can be transferred to the condensation section of the L-shaped shell 10 through the one-way valve 20 at the bending area. The directional transfer effect of the one-way valve can accelerate the gas flow in this bending area, thereby increasing the heat transfer rate and improving the thermal conductivity of the heat spreader 100. Furthermore, by setting the one-way valve 20, the gaseous working fluid can be prevented from flowing against gravity, thereby reducing transmission resistance and increasing the gas flow rate by more than five times compared to existing technologies.

[0039] In this embodiment, the one-way valve 20 can be a Tesla one-way valve.

[0040] Optionally, the one-way valve 20 extends on the first vertical plate 112 for three-quarters of the height H of the first vertical plate 112, and extends on the first horizontal plate 111 for three-quarters of the width W of the first horizontal plate 111. More specifically, the inlet end of the one-way valve 20 is closer to the end of the first vertical plate 112 away from the first horizontal plate 111, and the outlet end is closer to the end of the first horizontal plate 111 away from the first vertical plate 112. This allows the gaseous working fluid to enter the one-way valve 20 more quickly and be transported to the condenser section through the one-way valve 20, further accelerating the transport of the gaseous working fluid. Of course, in other embodiments, the length of the one-way valve extending on the first horizontal plate or the first vertical plate can also be one-half or one-quarter of the length of the first horizontal plate or the first vertical plate, etc., and can be set according to actual needs.

[0041] In this embodiment, the heat spreader 100 further includes N liquid-absorbing cores 30 located within the sealed cavity, where N ≥ 2, and these N liquid-absorbing cores 30 extend from the evaporation section to the condensation section. Further, the liquid-absorbing cores 30 may be disposed on the first cover plate 11, the second cover plate 12, or both the first cover plate 11 and the second cover plate 12; no specific limitation is imposed in this regard.

[0042] Taking the N absorbent cores 30 disposed on the first cover plate 11 as an example, one end of the absorbent core 30 is located on the inner wall of the first vertical plate 112, and the other end of the absorbent core 30 extends along the first vertical plate 112 and through the connection between the first vertical plate 112 and the first horizontal plate 111 to the inner wall of the first horizontal plate 11. Optionally, one end of the absorbent core 30 is flush with the end of the first vertical plate 112 away from the first horizontal plate 111, and the other end of the absorbent core 30 is flush with the end of the first horizontal plate 111 away from the first vertical plate 112. That is, the absorbent core 30 covers the first cover plate 11 in its length direction, which is beneficial to the transport and diffusion of the liquid working fluid.

[0043] The N absorbent cores 30 are arranged sequentially along the length L of the L-shaped housing 10, as follows: Figure 1As shown, the length of the L-shaped shell 10 is also the length L of the first vertical plate 112 and the second vertical plate 121. The position of the i-th absorbent core 30 is [1+(i-1)] / 2N of the length L of the L-shaped shell 10. For example, when i=1, the position of the first absorbent core is 1 / 2N of the length L of the first vertical plate 112. For instance, when N=2, the positions of the two absorbent cores 30 are 1 / 4 and 3 / 4 of the length L of the first vertical plate 112, respectively; or, when N=5, the positions of the five absorbent cores 30 on the first vertical plate 112 are 1 / 10, 3 / 10, 1 / 2, 7 / 10, and 9 / 10 of the length L of the first vertical plate 112, respectively; the number of absorbent cores on the heat spreader can be ≥2; when N=3, the positions are 1 / 6, 1 / 2, and 5 / 6.

[0044] Of course, in other embodiments, the arrangement of the absorbent cores can be, for example, uniform arrangement.

[0045] Each absorbent core 30 has a width of 1.9-2.3 mm (e.g., 2.0 mm), a thickness of 0.2 mm, a single wire diameter of 0.05-0.1 mm (e.g., 0.1 mm), and a mesh size of 200. It is made of T2 copper. Furthermore, the surface of the absorbent core 30 has a copper oxide layer, and the contact angle between the capillary structure on the capillary structure and the copper oxide layer surface is 0°, thereby improving the hydrophilicity of the absorbent core 30. In the manufacturing process of the absorbent core 30, a core body (e.g., copper mesh) is first made of T2 pure copper. Then, the surface of the core body is oxidized to form a copper oxide layer, and a capillary structure is formed on the copper oxide surface. The contact angle between the capillary structure and the copper oxide surface is 0°, giving the absorbent core 30 superhydrophilic properties. If the capillary structure is formed directly on the surface of the pure copper core without oxidation treatment, the contact angle between the capillary structure and the pure copper core surface will be larger, generally 80-88°, resulting in poor hydrophilicity.

[0046] In addition, the surface tension of the capillary structure of the liquid wick 30 is 0.08 N / m, which can enhance the anti-gravity climbing ability of the liquid wick 30, enabling the working fluid in the cold zone to climb rapidly, thereby accelerating the circulation of the liquid working fluid.

[0047] Optionally, in order to further accelerate the movement of the gaseous working fluid, multiple check valves 20 can be provided, and check valves 20 and liquid suction cores 30 can be arranged alternately. For example, check valves 20 can be provided between two adjacent liquid suction cores 30.

[0048] In the embodiments of this application, the side of the one-way valve 20 away from the first cover plate 11 abuts against the second cover plate 12, that is, the part of the one-way valve 20 located on the first vertical plate 112 abuts against the second vertical plate 122, and the part of the one-way valve 20 located on the first horizontal plate 111 abuts against the second horizontal plate 121, so as to form support for the sealed cavity, thereby greatly improving the deformation resistance of the heat spreader 100.

[0049] Furthermore, the sealed cavity is also provided with multiple support columns 40 and multiple support strips 50 for supporting the sealed cavity. The multiple support columns 40 may be distributed within the first cavity, or within the second cavity, or both the first and second cavities may have support columns 40. The support columns 40 abut against the first cover plate 11 and the second cover plate 12. More specifically, one end of the support column 40 may be fixed to the first cover plate 11 and the other end abuts against the second cover plate 12, or one end of the support column 40 may be fixed to the second cover plate 11 and the other end abuts against the first cover plate 11.

[0050] Each support bar 50 extends from the evaporation section to the condensation section. The support bar 50 can be located on the first cover plate 11, the second cover plate 12, or both. Taking the support bar 50 located on the first cover plate 11 as an example, one end of the support bar 50 is located on the inner wall of the first vertical plate 112, and the other end extends along the inner wall of the first vertical plate 112, passing through the connection between the first vertical plate 112 and the first horizontal plate 111, to the inner wall of the first horizontal plate 111. The side of the support bar 50 away from the first cover plate 11 abuts against the second cover plate 121. Through the action of the support column 40 and the support bar 50, the deformation resistance of the heat spreader 100 can be further improved.

[0051] Multiple support strips 50 are arranged along the length L of the L-shaped shell 10, with a spacing of 2 mm between adjacent support strips and a width of 0.4 mm. The total volume of all support strips 50 accounts for 4%-8% of the total volume, for example, 4%, 6%, or 8%. Within this volume percentage range, the support strips 50 can effectively provide support while ensuring sufficient space in the sealed cavity, allowing for effective transport of the liquid working fluid. Conversely, if the volume percentage is too small, the support strips may lack sufficient support capacity. Under vacuum conditions in the sealed cavity of the L-shaped shell 10, excessive pressure may cause deformation of the outer surface of the L-shaped shell 10, potentially damaging the core package upon contact between the heat spreader and the core package. Therefore, by setting the volume percentage within the aforementioned range, this application provides sufficient support while avoiding excessive space occupation of the sealed cavity by the support strips.

[0052] Optionally, such as Figure 3 As shown, the heat spreader 100 also includes a wire mesh 60 located within the sealed cavity. In some implementations, the wire mesh 60 may be disposed in the evaporation section, for example, on the inner wall of the second vertical plate 122 of the second cover plate 12, and the wire mesh 60 may be in contact with the liquid suction core 30, thereby rapidly diffusing the liquid working fluid transported against gravity by the liquid suction core 30 to the entire surface of the evaporation section; each node of the wire mesh 60 is equivalent to a boiling core, which can accelerate the boiling of the liquid working fluid in that area, thereby accelerating the transformation of the liquid working fluid from liquid to gas.

[0053] In other implementations, the wire mesh 60 can extend from the evaporation section to the condensation section. For example, the wire mesh 60 can be disposed on the inner wall of the second horizontal plate 121 and the second vertical plate 122 of the second cover plate 12, that is, extending from the second vertical plate 122 to the second horizontal plate 121. The liquid working fluid in the condensation section can also be transferred to the evaporation section through the wire mesh 60. The wire mesh 60 and the liquid suction core 30 jointly transfer the liquid working fluid, and the wire mesh 60 can also be in contact with the liquid suction core 30, which can collect the dispersed liquid working fluid. The collected liquid working fluid can be transferred to the evaporation section along the wire mesh 60 and the liquid suction core 30, improving the transfer efficiency. The wire mesh 60 located in the evaporation section has each node that is equivalent to a boiling nucleus, which can accelerate the boiling of the liquid working fluid in this area, thereby accelerating the transformation of the liquid working fluid from liquid to gas.

[0054] Therefore, the wire mesh 60 of this application can both collect and transport liquid working fluid, and also accelerate the boiling of liquid working fluid in the evaporation section.

[0055] Of course, in some other embodiments, the screen 60 may also be disposed on the first cover plate.

[0056] The thickness of the wire mesh 60 can be 0.1-0.17mm, and the mesh size is 250 mesh.

[0057] See Figure 4 This application also provides a battery assembly 200, which includes a single cell 70 and at least one heat spreader, wherein the heat spreader is the heat spreader 100 described in any of the above embodiments.

[0058] The single-cell battery 70 includes a battery housing 701 and at least one core pack 702 disposed within the battery housing 701, and the heat spreader 100 is disposed within the battery housing 701. The core pack 702 includes a top surface 7021 for mounting terminals, a bottom surface opposite to the top surface 7021, and a side surface 7022 located between the top surface 7021 and the bottom surface. The condensation portion of the L-shaped housing 10 of each heat spreader 10 is attached to the bottom surface of one core pack 702, specifically, the second horizontal plate 121 of the second cover plate 12 is attached to the bottom surface of the core pack 702; the evaporation portion of each L-shaped housing 10 is attached to the side surface 7022 of one core pack 702, specifically, the second vertical plate 122 of the second cover plate 12 is attached to the side surface 7022 of the core pack 702. Furthermore, the evaporation section of the L-shaped housing 10 is fitted with the side of the core package 702 with the largest area, that is, the second vertical plate 122 is fitted with the side of the core package 702 with the largest area. Figure 5 As shown, the battery assembly 200 also includes a liquid cooling plate 80, which is attached to the bottom of the single cell 70. It can be understood that the bottom of the single cell 70 is also the part where the bottom surface of the core pack 702 is located. The liquid cooling plate 80 and the single cell 70 can be fixed together by thermally conductive adhesive.

[0059] By setting an L-shaped heat spreader 100 inside the single cell 70, the heat generated by the electrode post can be quickly transferred to the bottom of the single cell 70, thereby conducting the heat to the liquid cooling plate 80 in a timely manner, and dissipating the heat through the liquid cooling plate 80, thus improving the heat dissipation effect of the single cell 70.

[0060] Furthermore, there are multiple core packages 702 and heat spreaders 100, for example, Figure 4 As shown, there are two cell packs 702 and two heat spreaders 100. The single cell 70 further includes a connecting piece 703 and a battery cover 704. The connecting piece 703 connects to the cell pack 702, and the battery cover 704 has terminals for sealing the battery casing 701. The evaporation portions of the L-shaped casings 10 of each pair of heat spreaders 100 are bonded together, while the condensation portions extend in opposite directions. Therefore, by bonding portions of the two heat spreaders 100 together, heat can be transferred between them. This allows the corresponding heat spreader of the other cell pack to dissipate heat promptly when the temperature of one cell pack 702 is high, reducing the risk of thermal runaway.

[0061] In this application, the heat spreader 100 has its evaporation section in large-area contact with the core package 702. The liquid working fluid in its sealed cavity is located in the condensation section. The liquid working fluid can rise against gravity along the wick 30 and diffuse throughout the evaporation section via the wire mesh 60. During the charging and discharging of the single cell 70, a large amount of heat is generated at its terminal post, resulting in a high temperature. The liquid working fluid in the evaporation section absorbs a large amount of heat and vaporizes into a gaseous working fluid. The gaseous working fluid moves along the cavity portion of the sealed cavity towards the condensation section. When passing through the bending area, the gaseous working fluid can be transferred through the one-way valve 20. After encountering cooling in the condensation section, the gaseous working fluid liquefies and releases heat. The heat is carried away by the liquid cooling plate 80 at the bottom of the single cell 70. The liquefied working fluid re-gathers in the condensation section, rises against gravity again along the wick 30, diffuses, absorbs heat, vaporizes, moves downwards, and liquefies again upon encountering cooling, thus achieving heat transfer in a continuous cycle.

[0062] The one-way valve 20 accelerates the transport rate of the gaseous working fluid in the bending area, allowing it to move directionally and rapidly to the bottom of the heat spreader 100, i.e., the condensation section. This improves the heat transfer efficiency of the heat spreader 100 and ensures its thermal conductivity under the operating conditions of large single-cell batteries. Simultaneously, the valve body strip-shaped support structure formed by the one-way valve 20 greatly enhances the heat spreader 100's ability to withstand deformation.

[0063] The above describes a heat spreader and battery assembly. The heat spreader includes an L-shaped housing and a one-way valve for heat transfer. The L-shaped housing includes a first cover plate and a second cover plate. The first cover plate includes a first horizontal plate and a first vertical plate connected to the first horizontal plate to form an L-shape. The second cover plate includes a second horizontal plate and a second vertical plate connected to the second horizontal plate to form an L-shape. The edges of the first horizontal plate and the second horizontal plate are sealed together to form a condensation section of the L-shaped housing. The edges of the first vertical plate and the second vertical plate are sealed together to form an evaporation section of the L-shaped housing. A first cavity is formed between the first horizontal plate and the second horizontal plate, and a second cavity is formed between the first vertical plate and the second vertical plate. The body has a first cavity and a second cavity connected to form an L-shaped sealed cavity. The one-way valve is located in the sealed cavity and is disposed on the first cover plate. The inlet end of the one-way valve is disposed on the inner wall of the first vertical plate, and the outlet end of the one-way valve extends along the first vertical plate and through the connection between the first vertical plate and the first horizontal plate to the inner wall of the first horizontal plate. The connection between the first vertical plate and the first horizontal plate is also the bending area of ​​the L-shaped shell. That is, this application uses a one-way valve in the bending area of ​​the L-shaped shell to transfer gaseous working fluid. The directional effect of the one-way valve can accelerate the gas flow in the bending area, thereby improving the heat conduction capacity of the heat spreader.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A heat spreader, characterized in that, The device includes an L-shaped housing and a one-way valve for transferring a gaseous working fluid. The L-shaped housing includes a first cover plate and a second cover plate. The first cover plate includes a first horizontal plate and a first vertical plate connected to the first horizontal plate to form an L-shape. The second cover plate includes a second horizontal plate and a second vertical plate connected to the second horizontal plate to form an L-shape. The edges of the first horizontal plate and the second horizontal plate are sealed together to form a condensation section of the L-shaped housing. The edges of the first vertical plate and the second vertical plate are sealed together to form an evaporation section of the L-shaped housing. A first cavity is formed between the first horizontal plate and the second horizontal plate. A second cavity is formed between the first vertical plate and the second vertical plate. The first cavity and the second cavity are connected to form an L-shaped sealed cavity. The one-way valve is located in the sealed cavity and is disposed on the first cover plate, wherein the inlet end of the one-way valve is disposed on the inner wall of the first vertical plate, and the outlet end of the one-way valve extends along the first vertical plate and through the connection between the first vertical plate and the first horizontal plate to the inner wall of the first horizontal plate.

2. The heat spreader according to claim 1, characterized in that, The one-way valve extends on the first vertical plate for three-quarters of the height of the first vertical plate, and extends on the first horizontal plate for three-quarters of the width of the first horizontal plate.

3. The heat spreader according to claim 1, characterized in that, It also includes N liquid-absorbing cores located in the sealed cavity, where N≥2, and the N liquid-absorbing cores extend from the evaporation section to the condensation section; The N absorbent cores are arranged sequentially along the length of the L-shaped shell, wherein the position of the i-th absorbent core is at [1+(i-1)] / 2N of the length of the L-shaped shell.

4. The heat spreader according to claim 3, characterized in that, The absorbent core has a width of 1.9-2.3 mm, a thickness of 0.2 mm, a single wire diameter of 0.05-0.1 mm, a mesh size of 200, and is made of T2 copper.

5. The heat spreader according to claim 1, characterized in that, The side of the one-way valve away from the first cover plate abuts against the second cover plate to support the sealing cavity.

6. The heat spreader according to claim 1, characterized in that, The sealed cavity is also provided with multiple support columns and multiple support bars for supporting the sealed cavity; each of the support bars extends from the evaporation section to the condensation section; The multiple support bars are arranged along the length of the L-shaped shell, with a spacing of 2mm between adjacent support bars and a width of 0.4mm for each support bar.

7. The heat spreader according to claim 1, characterized in that, It also includes a wire mesh located within a sealed cavity, the wire mesh being disposed in the evaporation section or extending from the evaporation section to the condensation section, the wire mesh having a thickness of 0.1-0.17 mm and a mesh size of 250 mesh.

8. The heat spreader according to claim 1, characterized in that, The L-shaped housing is made of copper, copper alloy, aluminum, aluminum alloy or stainless steel, and the outer surface of the L-shaped housing is treated with insulating spraying or electroplating.

9. A battery assembly, characterized in that, It includes a single cell and at least one heat spreader, wherein the heat spreader is the heat spreader according to any one of claims 1-8; The single cell includes a battery casing and at least one core pack disposed within the battery casing. The heat spreader is disposed within the battery casing. The core pack includes a top surface for mounting the electrode post, a bottom surface opposite to the top surface, and a side surface located between the top and bottom surfaces. The condensation portion of the L-shaped casing of each heat spreader is attached to the bottom surface of one core pack, and the evaporation portion of each L-shaped casing is attached to the side surface of one core pack.

10. The battery assembly according to claim 9, characterized in that, The number of core packages and heat spreaders is multiple, and the evaporation sections of the L-shaped shells of every two heat spreaders are attached together, while the condensation sections extend in opposite directions. The evaporation section is attached to the side of the largest area of ​​the core pack; the battery assembly also includes a liquid cooling plate, which is attached to the bottom of the individual battery cell.

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