Hot plate, battery cell and battery

Abstract

The application provides a uniform heating plate, a battery cell and a battery, and relates to the technical field of batteries. The uniform heating plate comprises a first plate and a second plate; the second plate is connected with the first plate to define a closed inner cavity; a plurality of support columns are arranged in the inner cavity, the support columns are connected with the first plate and the second plate, and the cross section of the support columns gradually increases from the first plate to the second plate. According to the application, the cross section of the support columns gradually increases from the first plate to the second plate, so that the connecting area between the support columns and the second plate can be increased, the connecting reliability between the support columns and the second plate is improved, and the connecting reliability between the second plate and the first plate is improved. In this way, the structural reliability of the uniform heating plate can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a heat spreader, a battery cell, and a battery. Background Technology

[0002] A battery comprises multiple electrically connected cells. Each cell includes a casing, electrode assemblies housed within the casing, and terminal posts mounted on the casing. Cells generate heat during charging and discharging, especially high-energy-density lithium-ion cells. Due to their high energy density, these cells generate heat at a high rate, resulting in higher cell temperatures. High temperatures reduce cell reliability, leading to significant performance and lifespan degradation.

[0003] Therefore, in related technologies, a heat spreader is configured for the battery cell to dissipate heat and improve the temperature uniformity of the cell. A heat spreader is a component with an inner cavity containing a liquid wick and a heat exchange medium. The inner cavity is divided into a heated area and a cold end based on the heat absorption and dissipation state of the heat exchange medium. After absorbing heat in the heated area, the heat exchange medium evaporates into a gaseous state and diffuses to the cold end, which is far from the heated area. The gaseous heat exchange medium condenses at the cold end and returns to the heated area to absorb heat under the capillary force of the liquid wick. Through this repeated circulation of the heat exchange medium, the purpose of heat dissipation and temperature uniformity of the battery cell is achieved.

[0004] Because the vapor chamber needs to be molded to create an inner cavity, it is formed by interlocking two plates. This results in the two plates only being connected at their periphery, leading to poor connection reliability and consequently, poor structural reliability of the vapor chamber. Utility Model Content

[0005] Embodiments of this application provide a heat spreader, a battery cell, and a battery, which can improve the structural reliability of the heat spreader.

[0006] In a first aspect, embodiments of this application provide a heat spreader, which includes a first plate and a second plate; the second plate is connected to the first plate to define a closed inner cavity; wherein, a plurality of support columns are provided in the inner cavity, the support columns connect the first plate and the second plate, and the cross-section of the support columns gradually increases from the first plate to the second plate.

[0007] In some embodiments, a flow guide groove is provided on the plate surface of the first plate and / or the second plate facing the inner cavity. There are multiple flow guide grooves, which are distributed in a crisscross pattern.

[0008] In some embodiments, multiple guide channels divide the cavity wall into multiple blocks, each block corresponding to a multiple support column, and the support column is connected to the corresponding block.

[0009] In some embodiments, the outer diameter of the end of the support column connected to the first plate is d1, which satisfies: 0.5mm≤d1≤5mm.

[0010] In some embodiments, the multiple support columns are arranged in a matrix.

[0011] In some embodiments, the center-to-center distance between two adjacent support columns is d2, which satisfies: 1.5mm≤d2≤5mm.

[0012] In some embodiments, the support column is welded to the second plate; and / or, the periphery of the first plate is welded to the periphery of the second plate.

[0013] In some embodiments, the heat exchange plate further includes a heat exchange medium and a liquid suction core, both of which are disposed in the inner cavity, and the liquid suction core is provided with a through hole for the support column to pass through.

[0014] In some embodiments, a constant-diameter post is provided at the end of the support post away from the first plate. The shape and size of the cross-section of the constant-diameter post are consistent with the shape and size of the end face of the support post facing the second plate. The constant-diameter post passes through the through hole.

[0015] Secondly, embodiments of this application provide a battery cell, which includes a housing, a cover plate, a core package, and the aforementioned heat spreader plate; the cover plate closes to the housing to define a receiving cavity; the core package is disposed in the receiving cavity; and the heat spreader plate is disposed in the receiving cavity and thermally coupled to the core package.

[0016] Thirdly, embodiments of this application provide a battery comprising a plurality of cells; wherein the cells are the aforementioned cells; and / or, the aforementioned heat spreader is provided on one side of the cells, the heat spreader being thermally coupled to the outer casing of the cells.

[0017] The beneficial effects of the embodiments of this application are as follows:

[0018] In the embodiments of this application, by setting the cross-section of the support column to gradually increase from the first plate to the second plate, the connection area between the support column and the second plate can be increased, thereby improving the connection reliability between the support column and the second plate, and thus improving the connection reliability between the second plate and the first plate. This enhances the structural reliability of the heat spreader. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the internal structure of the heat spreader provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the first plate provided in an embodiment of this application;

[0022] Figure 3 This is a side view of the first plate provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a heat spreader provided in an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of another heat spreader provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the structure of the battery cell provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100 - Heat spreader; 11 - First plate; 111 - Vertical plate; 112 - Horizontal plate;

[0028] 12-Second plate; 13-Inner cavity;

[0029] 14 - Support column; 141 - Column of equal diameter;

[0030] 15-Guide channel; 16-Block; 17-Liquid suction core; 171-Through hole;

[0031] 10-Plate section;

[0032] 200-Cell; 21-Casing; 22-Cover plate; 23-Cell pack; 24-Terminal post; 25-Receiving cavity. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in a product that includes said element.

[0036] The following combination Figures 1 to 6 The present application provides a detailed description of a heat spreader 100, a battery cell 200, and a battery pack, as provided in the embodiments of this application.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of the internal structure of a heat spreader 100 provided in an embodiment of this application. In a first aspect, an embodiment of this application provides a heat spreader 100. The heat spreader 100 includes a first plate 11 and a second plate 12. The second plate 12 is interconnected with the first plate 11 to define a closed inner cavity 13. A plurality of support columns 14 are provided in the inner cavity 13. The support columns 14 connect the first plate 11 and the second plate 12. From the first plate 11 to the second plate 12, the cross-section of the support columns 14 gradually increases.

[0038] The cross-section of the support column 14 refers to the shape obtained by intersecting the support column 14 with a plane perpendicular to its axis. For example, when the support column 14 is conical, its cross-section is circular. When the support column 14 is pyramidal, its cross-section is polygonal.

[0039] It is understood that the first plate 11 and the support column 14 are integrally formed, and the connection strength between them is good. The support column 14 is fixedly connected to the second plate 12 by welding, gluing, or other methods, which results in the connection strength between the support column 14 and the second plate 12 being lower than the connection strength between the support column 14 and the first plate 11. Therefore, in order to improve the connection strength between the support column 14 and the second plate 12, the cross-section of the support column 14 is made to gradually increase from the first plate 11 to the second plate 12, thereby increasing the connection area between the support column 14 and the second plate 12 and thus improving the connection strength. Specifically, a plurality of support columns 14 are protruding from the surface of the first plate 11 facing the inner cavity 13.

[0040] Specifically, one of the first plate 11 and the second plate 12 may be configured to contact a heat source. Alternatively, the first plate 11 and the second plate 12 may each contact two heat sources to cool and dissipate heat. The heat source is a component that requires heat dissipation. For example, the heat source may be the battery cell 200.

[0041] It is understood that the heat exchange plate 100 also includes a liquid wick 17 disposed in the inner cavity 13 and a heat exchange medium, the inner cavity 13 including a heated area and a cold end. After absorbing heat in the heated area, the heat exchange medium evaporates into a gaseous state. The gaseous heat exchange medium diffuses to the cold end, which is far away from the heated area, and after condensing at the cold end, it flows back to the heated area under the capillary force of the liquid wick 17, and absorbs heat and evaporates again. This cycle repeats continuously, achieving heat dissipation and temperature equalization of the battery cell 200.

[0042] For example, the first plate 11 and the second plate 12 may be made of metal, including but not limited to stainless steel, copper, aluminum, copper alloy, and aluminum alloy.

[0043] In addition, heat exchange media include, but are not limited to: pure water, ethanol, distilled water, heat transfer fluid, coolant, and phase change medium.

[0044] It is understandable that the support column 14 is integrally set with the first plate 11, and the end of the support column 14 away from the first plate 11 can be glued or welded to the second plate 12.

[0045] For example, a first plate 11 with a support column 14 can be first cast, and then the support column 14 can be pressed to increase the cross-section of the end of the support column 14 away from the first plate 11. At the same time, molds can be arranged on both sides of the support column 14 during pressing to guide the deformation of the support column 14 under pressure.

[0046] In this embodiment, by setting the cross-section of the support column 14 to gradually increase from the first plate 11 to the second plate 12, the connection area between the support column 14 and the second plate 12 can be increased, thereby improving the connection reliability between the support column 14 and the second plate 12, and thus improving the connection reliability between the second plate 12 and the first plate 11. In this way, the structural reliability of the heat spreader 100 can be improved.

[0047] Please see Figure 1 In some embodiments, the support column 14 is a truncated cone. This allows for a smooth change in the cross-section of the support column 14, which helps to improve the uniformity of stress distribution, thereby improving the stress state of the support column 14 and enhancing the structural reliability of the heat spreader 100.

[0048] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the first plate 11 provided in an embodiment of this application. In some embodiments, the cross-section of the support column 14 is circular. Thus, the support column 14 is a frustum structure.

[0049] In this embodiment, by setting the cross-section of the support column 14 to be circular, the circumferential surface of the support column 14 is a continuous curved surface without sharp edges, thereby ensuring that the load borne by the support column 14 is evenly distributed along the circumference, effectively avoiding stress concentration. This improves the stress state of the support column 14, thus enhancing the structural reliability of the heat spreader 100.

[0050] Please see Figure 1 In some embodiments, the angle between the generatrix of the support column 14 and the axial direction of the support column 14 is α, which satisfies: 10°≤α≤30°.

[0051] It is understood that the included angle α between the generatrix of the support column and the axial direction of the support column 14 includes, but is not limited to, 10°, 10.5°, 11°, 11.8°, 12°, 12.3°, 13°, 13.7°, 14°, 14.2°, 15°, 15.9°, 11°, 11.4°, 17°, 17.5°, 18°, 18.1°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 22°, 28°, 29°, and 30°.

[0052] In this embodiment, the above-mentioned arrangement can make the support column 14 have a larger area connected to the second plate 12, and can also avoid the support column 14 having too large a change in cross-sectional dimensions, which would result in the angle between the support column 14 and the first plate 11 being too small. This can reduce the stress at the connection between the support column 14 and the first plate 11, thereby improving the structural reliability of the heat spreader 100.

[0053] Please see Figure 1 and Figure 2 In some embodiments, guide channels 15 are provided on the surface of the first plate 11 facing the inner cavity 13. There are multiple guide channels 15, which are distributed in a crisscross pattern. This allows the size of the inner cavity 13 to be increased, facilitating the filling of more heat exchange medium within the cavity. Furthermore, the guide channels 15 guide the flow of the heat exchange medium, improving its smoothness. This, in turn, enhances the heat exchange efficiency of the heat exchange plate 100.

[0054] In another embodiment, a guide groove 15 is provided on the plate surface of the second plate 12 facing the inner cavity 13. There are multiple guide grooves 15, which are distributed in a crisscross pattern.

[0055] In another embodiment, multiple guide grooves 15 are provided on the surface of the first plate 11 facing the inner cavity 13 and on the surface of the second plate 12 facing the inner cavity 13. The multiple guide grooves 15 on the first plate 11 are arranged in a crisscross pattern, and the multiple guide grooves 15 on the second plate 12 are also arranged in a crisscross pattern.

[0056] Please see Figure 2 In some embodiments, multiple guide channels 15 divide the cavity wall of the inner cavity 13 into multiple blocks 16. Each block 16 corresponds one-to-one with a multiple support pillar 14, and the support pillar 14 is connected to its corresponding block 16. This allows for a regular layout of the support pillars 14 and guide channels 15, which helps improve the uniformity of the structural distribution inside the heat spreader 100, thereby improving the stress state of the heat spreader 100 and enhancing its structural reliability.

[0057] Please see Figure 1 In some embodiments, the outer diameter of the end of the support column 14 connected to the first plate 11 is d1, which satisfies: 0.5mm≤d1≤5mm.

[0058] It is understood that the outer diameter d1 of the end of the support column 14 connected to the first plate 11 includes, but is not limited to, 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.4mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 4.9mm, and 5mm.

[0059] In this embodiment, the above-mentioned limitations allow for sufficient connection area between the support column 14 and the first plate 11, thereby improving the reliability of the connection between the support column 14 and the first plate 11. On the other hand, the radial dimension of the support column 14 can be controlled to avoid it occupying too much space in the inner cavity 13, thus ensuring the amount of heat exchange medium filled in the inner cavity 13 and thus ensuring the heat exchange efficiency of the heat spreader 100.

[0060] Please see Figure 2 In some embodiments, the multiple support columns 14 are arranged in a matrix. This makes the support columns 14 arranged in a regular pattern, thereby improving the uniformity of the load-bearing capacity of the heat spreader 100 and making the load borne by the heat spreader 100 more dispersed, which helps to improve the structural reliability of the heat spreader 100.

[0061] Please see Figure 3 , Figure 3 This is a side view of the first plate 11 provided in an embodiment of this application. In some embodiments, the center-to-center distance between two adjacent support columns 14 is d2, which satisfies: 1.5mm ≤ d2 ≤ 5mm.

[0062] It is understood that the center-to-center distance d2 between two adjacent support columns 14 may include, but is not limited to, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, and 5mm.

[0063] In this embodiment, the above-mentioned limitations ensure that there is sufficient center-to-center spacing between the columns to facilitate a more dispersed column layout, which in turn facilitates the flow of the heat exchange medium. At the same time, it avoids that excessive spacing between the columns would reduce the connection strength between the first plate 11 and the second plate 12.

[0064] In some embodiments, the support column 14 is welded to the second plate 12. This ensures a reliable connection between the support column 14 and the second plate 12, thereby improving the structural reliability of the heat spreader 100.

[0065] In some embodiments, the periphery of the first plate 11 is welded to the periphery of the second plate 12. This ensures a reliable connection between the first plate 11 and the second plate 12, thereby improving the structural reliability of the heat spreader 100.

[0066] Specifically, the first plate 11 and the second plate 12 are welded together without filler material. In particular, the first plate 11 and the second plate 12 are joined together as a whole by diffusion welding.

[0067] Please see Figure 4 , Figure 4This is a schematic diagram of the structure of a heat spreader 100 provided in an embodiment of this application. In some embodiments, the first plate 11 and the second plate 12 are both L-shaped, and the first plate 11 and the second plate 12 are stacked to define an L-shaped inner cavity 13.

[0068] It can be understood that the heat spreader 100 is L-shaped and has two plate portions 10 arranged at an angle. The two plate portions 10 can be respectively attached to the two angled surfaces of the heat source, thereby increasing the contact area between the heat spreader 100 and the heat source, which helps to improve the heat dissipation efficiency of the heat source.

[0069] For example, the heat source is the core package 23. One plate portion 10 of the heat spreader 100 is in contact with the large surface of the core package 23, and the other plate portion 10 is in contact with the bottom surface of the core package 23.

[0070] Please see Figure 4 , Figure 5 This is a schematic diagram of another heat spreader 100 provided in an embodiment of this application. In some embodiments, there are two first plates 11. Both first plates 11 are L-shaped and mirror images of each other. Each first plate 11 includes a vertical plate 111 and a horizontal plate 112. The vertical plates 111 of the two first plates 11 are connected to each other, and the horizontal plates 112 of the two first plates 11 are arranged opposite to each other and connected to both ends of the second plate 12, thereby defining a T-shaped cavity 13. A support post 14 protrudes from one vertical plate 111 to the other vertical plate 111, and the vertical plates 111 are connected to each other through the support post 14. This allows the vertical plates 111 and horizontal plates 112 of the first plates 11 to contact the two side walls of the heat source, thereby increasing the contact area between the heat spreader 100 and the heat source, and thus improving the heat dissipation efficiency of the heat source.

[0071] For example, the heat source is two core packages 23. A heat spreader 100 is disposed between the two core packages 23, two vertical plates 111 respectively contact the opposite surfaces of the two core packages 23, and two horizontal plates 112 respectively contact the end faces of the two core packages 23.

[0072] In some embodiments, the heat exchange plate 100 further includes a heat exchange medium and a liquid suction core 17. Both the heat exchange medium and the liquid suction core 17 are disposed in the inner cavity 13. The liquid suction core 17 is provided with a through hole 171 for the support column 14 to pass through.

[0073] It is understood that the liquid-absorbing core 17 can be a capillary network, or it can be a sintered metal powder, a sintered fiber core, a nanomaterial liquid-absorbing core 17, or a composite liquid-absorbing core 17, etc.

[0074] The heat exchange medium can be a phase change substance. A phase change substance, also known as a phase change energy storage substance, is a substance that changes from one state to another through temperature changes, accompanied by heat absorption or release.

[0075] For example, the phase change material includes one or more of the following: solid-solid phase change materials, solid-liquid phase change materials, liquid-liquid phase change materials, liquid-gas phase change materials, and solid-gas phase change materials. Optionally, the phase change material includes solid-liquid phase change materials. Specifically, solid-liquid phase change materials include organic solid-liquid phase change materials and inorganic solid-liquid phase change materials. The solid-liquid phase change material can be an aqueous compound, such as lithium nitrate trihydrate, calcium chloride hydrate, sodium sulfate hydrate, sodium carbonate hydrate, etc.; it can also be an organic solid-liquid phase change material such as aliphatic hydrocarbons, polypolyols, or polyenols, such as paraffin wax; or it can be an organic solid-solid phase change material such as polyols or polymers, such as pentaerythritol or neopentyl glycol. High thermal conductivity materials, such as graphite, carbon fiber, foamed metal, nano-alumina, nano-sized metal particles, nano-sized metal oxide particles, and metal scrap, can be added to the phase change material to increase its thermal conductivity, thereby improving the overall heating uniformity of the phase change material and thus enhancing the phase change uniformity.

[0076] Specifically, the heat exchange medium is a gas-liquid two-phase phase change material.

[0077] Please see Figure 1 and Figure 2 In some embodiments, a constant-diameter post 141 protrudes from the end of the support post 14 away from the first plate 11. The cross-sectional shape and dimensions of the constant-diameter post 141 are consistent with the shape and dimensions of the end face of the support post 14 facing the second plate 12. The constant-diameter post 141 passes through the through hole 171. In this way, the through hole 171 on the absorbent core 17 has a regular structure, which is beneficial to improving the stress state of the absorbent core 17. At the same time, it also allows for a larger connection area between the absorbent core 17 and the support post 14, which is beneficial to improving the positional stability of the absorbent core 17 in the inner cavity 13.

[0078] In some embodiments, the periphery of the first plate 11 is welded to the periphery of the second plate 12, and the support column 14 is welded to the second plate 12, so that the weld between the second plate 12 and the second plate 12 does not separate when the formed heat spreader 100 is in an environment with a temperature of 90°C and an air pressure of ≤50 Pa.

[0079] The main processes for forming the heat spreader plate 100 are as follows:

[0080] First, the surfaces of the first plate 11, the second plate 12, and the support column 14 used for welding are pretreated to make the surface roughness Ra≤0.8μm, so that the two parts in contact with each other have good fit.

[0081] Then, the liquid suction core 17, the first plate 11 and the second plate 12 are assembled and placed in the fixture to firmly hold the first plate 11 and the second plate 12, and to ensure that the distance between the corresponding welded parts does not exceed 0.2 mm.

[0082] The first plate 11 and the second plate 12, which are held by the fixture, are then transferred to a vacuum environment for heating and pressurization, with a vacuum degree ≤1x10. -2 The pressure loading was gradually increased from zero, specifically at 15 MPa, 25 MPa, and 30 MPa. The heating temperature was gradually increased from 800℃ to 950℃ in a linear manner, with a heating time of 30 min. The temperature was then held at 950℃ for 15 min to facilitate material diffusion between the first plate 11 and the second plate 12, as well as between the support column 14 and the second plate 12. Finally, the pressure was held at 25 MPa for 30 min.

[0083] Next, the formed heat spreader 100 is cooled at a rate of 5–20 °C / min.

[0084] Finally, the heat exchange medium is filled through the filling hole on the first plate 11 or the second plate 12, and the hole is sealed after filling.

[0085] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of the battery cell 200 provided in an embodiment of this application. In a second aspect, an embodiment of this application provides a battery cell 200, which includes a housing 21, a cover plate 22, a core package 23, and the aforementioned heat spreader 100. The cover plate 22 covers the housing 21 to define a receiving cavity 25. The core package 23 is disposed in the receiving cavity 25. The heat spreader 100 is disposed in the receiving cavity 25 and is thermally coupled to the core package 23.

[0086] It is understood that the battery cell 200 may also include two terminals 24, namely a positive terminal and a negative terminal. The cell cassette 23 includes a positive electrode plate, a separator, and a negative electrode plate stacked in sequence. The tab of the positive electrode plate is connected to the positive terminal, and the tab of the negative electrode plate is connected to the negative terminal.

[0087] It is understood that the battery cell 200 includes the aforementioned heat spreader 100, and the battery cell 200 has all the beneficial effects of the aforementioned heat spreader 100, which will not be repeated here in this embodiment.

[0088] For example, the battery cell 200 includes two core packages 23, and a heat spreader 100 is disposed between the two core packages 23.

[0089] Thirdly, embodiments of this application provide a battery comprising a plurality of cells 200.

[0090] Specifically, in some embodiments, the battery cell 200 is the aforementioned battery cell 200.

[0091] Specifically, in some embodiments, the aforementioned heat spreader 100 is provided on one side of the battery cell 200, and the heat spreader 100 is thermally coupled to the outer casing of the battery cell 200.

[0092] Specifically, in some other embodiments, the battery cell 200 is the aforementioned battery cell 200, and the aforementioned heat spreader 100 is provided on one side of the battery cell 200, and the heat spreader 100 is thermally coupled to the outer shell of the battery cell 200.

[0093] It is understood that the battery includes the aforementioned heat spreader 100, and the battery has all the beneficial effects of the aforementioned heat spreader 100, which will not be repeated here in this embodiment.

[0094] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A vapor chamber (100), characterized in that, include: First board (11); as well as The second plate (12) is connected to the first plate (11) to define a closed inner cavity (13); The inner cavity (13) is provided with a plurality of support columns (14), which connect the first plate (11) and the second plate (12). The cross-section of the support column (14) gradually increases from the first plate (11) to the second plate (12).

2. The vapor chamber (100) of claim 1, characterized in that A flow guide groove (15) is provided on the plate surface of the first plate (11) and / or the second plate (12) facing the inner cavity (13). There are multiple flow guide grooves (15), and the multiple flow guide grooves (15) are distributed in a crisscross pattern.

3. The vapor chamber (100) of claim 2, characterized in that The plurality of guide channels (15) divide the cavity wall of the inner cavity (13) into a plurality of blocks (16), and the plurality of blocks (16) correspond one-to-one with the plurality of support columns (14), and the support columns (14) are connected to the corresponding blocks (16).

4. The vapor chamber (100) according to any one of claims 1-3, characterized in that The outer diameter of the end of the support column (14) connected to the first plate (11) is d1, which satisfies: 0.5mm≤d1≤5mm.

5. The vapor chamber (100) according to any one of claims 1-3, characterized in that The multiple support columns (14) are arranged in a matrix.

6. The vapor chamber (100) of claim 5, characterized in that The center-to-center distance between two adjacent support columns (14) is d2, which satisfies: 1.5mm≤d2≤5mm.

7. The vapor chamber (100) according to any one of claims 1-3, characterized in that The support column (14) is welded to the second plate (12); and / or, the periphery of the first plate (11) is welded to the periphery of the second plate (12).

8. The vapor chamber (100) according to any one of claims 1-3, characterized in that The heat exchange plate (100) also includes a heat exchange medium and a liquid absorption core (17). The heat exchange medium and the liquid absorption core (17) are both disposed in the inner cavity (13). The liquid absorption core (17) is provided with a through hole (171) for the support column (14) to pass through.

9. The vapor chamber (100) of claim 8, characterized in that An equal-diameter column (141) is provided at one end of the support column (14) away from the first plate (11). The shape and size of the cross-section of the equal-diameter column (141) are consistent with the shape and size of the end face of the support column (14) facing the second plate (12). The equal-diameter column (141) passes through the through hole (171).

10. An electric core (200), characterized by, include: Shell (21); A cover plate (22) closes to the housing (21) to define a receiving cavity (25); The core package (23) is disposed in the receiving cavity (25); and The heat spreader (100) as described in any one of claims 1-9 is disposed in the receiving cavity (25) and thermally coupled to the core package (23).

11. A battery, characterized by Includes multiple battery cells (200); Wherein, the battery cell (200) is the battery cell (200) according to claim 10; and / or, A heat spreader (100) as described in any one of claims 1-9 is provided on one side of the battery cell (200), and the heat spreader (100) is thermally coupled to the outer casing of the battery cell (200).

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