Vapor chamber, direct-cooling plate and battery module

Abstract

Provided in the present application are a vapor chamber, a direct-cooling plate and a battery module. The vapor chamber comprises: a housing, wherein at least part of an inner cavity of the housing is configured as a closed cavity, and walls that form the closed cavity by means of enclosure include a first sidewall and a second sidewall; and a capillary element, which is attached to at least part of an inner surface of the first sidewall or the second sidewall, wherein at least part of the capillary element is in contact with a cooling medium in the closed cavity.

Description

Soaking plates, direct cooling plates and battery modules

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on November 28, 2023, with application numbers 202311614686.9, 202323238142.5, 202323247384.0, 202323256677.5, and 202323256700.0. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a heat soaking plate, a direct cooling plate, and a battery module. Background Art

[0003] In the field of battery technology, battery capacity and charge and discharge rate are key factors affecting the performance of energy storage batteries. Increasing battery capacity and charge and discharge rate is a hot topic in the current market. With the substantial increase in battery capacity, the heat generation and passive heat dissipation of the battery become increasingly difficult, resulting in serious temperature differences in single cells. For example, the battery is divided into three areas: upper, middle, and lower. The temperature of the upper area > the temperature of the middle area > the temperature of the lower area. The temperature difference between the upper area and the lower area is 10°C~20°C. This obvious temperature difference will affect the cycle life of the battery, especially after the battery is assembled into a module, the difficulty of heat dissipation of the battery will be further increased.

[0004] In the related art, a heat-conducting partition is sandwiched between each single battery in the battery module, and a liquid cooling plate is set at the bottom of the battery module. The heat emitted by each battery is transferred to the liquid cooling plate by the heat-conducting partition and then taken away by the liquid cooling plate.

[0005] However, the above-mentioned heat-conducting separator cannot solve the problem of large temperature differences between different areas on the single battery, thereby affecting the cycle life of the battery. SUMMARY OF THE INVENTION

[0006] The embodiments of the present application provide a heat-spreading partition, a direct cooling plate, and a battery module, which can improve the problem of large temperature differences in different areas of the battery.

[0007] In a first aspect, an embodiment of the present application provides a soaking plate for a battery module, wherein the battery module includes the soaking plate, batteries, and a direct cooling plate, wherein the soaking plate is disposed between any two batteries, and the soaking plate includes:

[0008] a first housing, wherein the first housing is provided with a hollow first cavity, at least a portion of the first cavity is configured as a closed cavity, and the walls enclosing the closed cavity include a first side wall and a second side wall, the first side wall contacts one of the two batteries, and the second side wall contacts the other of the two batteries;

[0009] A cooling medium is built into the closed cavity;

[0010] a capillary element attached to at least a portion of the inner surface of the first side wall or at least a portion of the inner surface of the second side wall, wherein at least a portion of the capillary element is in contact with the cooling medium;

[0011] The first shell includes a first end and a second end that are opposite to each other, and the second end of the first shell is connected to the direct cooling plate.

[0012] In a second aspect, an embodiment of the present application provides a battery module, comprising:

[0013] A heat-saturating baffle, wherein the heat-saturating baffle is the above-mentioned heat-saturating baffle;

[0014] A direct cooling plate, the direct cooling plate includes a top cover and a base connected to each other, the top cover of the direct cooling plate is connected to one end of the heat-equalizing baffle, the base is provided with a fluid channel, and a plurality of protrusions are provided on the side of the top cover facing away from the heat-equalizing baffle, and the protrusions are provided in the fluid channel.

[0015] In a third aspect, an embodiment of the present application provides a direct cooling plate, wherein the direct cooling plate is connected to one end of a soaking plate, wherein the soaking plate is the soaking plate described above, and the direct cooling plate comprises:

[0016] a second shell, wherein the second shell is provided with a hollow accommodating cavity;

[0017] A channel tube, the channel tube being disposed in the accommodating cavity, the inner cavity of the channel tube being defined as a fluid channel, the fluid channel being used for allowing a direct cooling medium to flow;

[0018] A heat-conducting medium is used to fill the gap between the channel tube and the shell.

[0019] In a fourth aspect, the present application provides a battery module, comprising:

[0020] a battery pack comprising a plurality of batteries arranged along a first direction;

[0021] A vapor chamber assembly, comprising a vapor chamber spacer disposed between adjacent batteries;

[0022] Among them, the heat-equalizing baffle is the above-mentioned heat-equalizing baffle, and the capillary element of the heat-equalizing baffle includes a main capillary structure and a secondary capillary structure. The main capillary structure and the secondary capillary structure are arranged at intervals in the first cavity of the heat-equalizing baffle, and the cross-sectional area of ​​the main capillary structure is larger than the cross-sectional area of ​​the secondary capillary structure.

[0023] In a fifth aspect, an embodiment of the present application provides a battery module, comprising:

[0024] base plate;

[0025] a plurality of batteries, each comprising a housing having a top surface and a bottom surface disposed opposite each other, the bottom surface further provided with a reinforcement structure, the reinforcement structure being configured to be connected to the bottom plate, the surface area of ​​the reinforcement structure being larger than an orthographic projection of the reinforcement structure on the top surface;

[0026] A heat distribution partition is provided between any two of the batteries, and the heat distribution partition is the above-mentioned heat distribution partition. Beneficial effects

[0027] The beneficial effects of this application are:

[0028] (1) The heat-equalizing partition provided in the present application is used to separate a first battery and a second battery, wherein at least a portion of the inner cavity of the heat-equalizing partition is configured as a closed cavity, and the walls enclosing the closed cavity include a first side wall and a second side wall, the first side wall is in contact with the first battery, and the second side wall is in contact with the second battery. A cooling medium is provided in the closed cavity of the heat-equalizing partition, and the heat generated by the first battery and the second battery is transferred to the heat-equalizing partition through the first side wall and the second side wall respectively. A portion of the liquid cooling medium inside the heat-equalizing partition absorbs the heat and then vaporizes and then rapidly diffuses in the entire closed cavity. The vaporized cooling medium contacts the direct cooling plate at the second end of the shell and is cooled to form condensate. The condensed cooling medium diffuses on the inner wall of the shell through the capillary element, thereby forming a heat-equalizing structure on the inner wall of the shell. Another part of the liquid cooling medium inside the heat-equalizing partition diffuses through the capillary element after absorbing heat, thereby making the temperatures of various areas of the closed cavity of the heat-equalizing partition close to the same. Correspondingly, the temperatures of the single cells in contact with different areas of the heat-equalizing partition tend to be consistent after heat exchange with the heat-equalizing partition, thereby effectively reducing the problem of large temperature differences in different areas of the single cells.

[0029] (2) The battery module provided in the present application includes the above-mentioned heat-equalizing partition and the direct cooling plate. The heat-equalizing partition in the battery module is used to separate the first battery and the second battery. The heat generated by the first battery and the second battery is respectively transferred to the heat-equalizing partition through the first side wall and the second side wall. The heat-equalizing partition is used to improve the temperature difference problem of the single battery. A plurality of protrusions are further provided on the top cover. The protrusions are used to increase the contact area between the direct cooling medium and the top cover. Since the heat transferred from the first battery and the second battery to the heat-equalizing partition is mainly dissipated through the top cover of the direct cooling plate, a plurality of protrusions are provided on the top cover, which is beneficial to improving the heat transfer efficiency between the top cover and the direct cooling medium, thereby improving the heat absorption effect of the top cover on the heat-equalizing partition.

[0030] (3) The direct cooling plate provided in the present application is connected to one end of the heat-equalizing baffle. A channel tube and a heat-absorbing medium are arranged inside the shell of the direct cooling plate, wherein the inner cavity of the channel tube is defined as a fluid channel for the flow of the direct cooling medium, and the gap between the channel tube and the shell is filled with the heat-absorbing medium. The heat generated by the battery is transferred to the heat-equalizing baffle and then to the shell of the direct cooling plate through the heat-equalizing baffle. The heat-conducting medium can quickly absorb the heat of the shell and then transfer the heat to the channel tube through the heat-conducting medium. By arranging the heat-conducting medium inside the direct cooling plate, the heat absorption performance of the direct cooling plate can be effectively improved, thereby effectively alleviating the serious heating problem of the battery.

[0031] (4) The battery module provided by the present application includes a heat spreader assembly, the heat spreader assembly includes a heat spreader partition, the interior of the heat spreader partition includes a primary capillary structure and a secondary capillary structure arranged at intervals, the secondary capillary structure is used to absorb the heat exchange medium between adjacent main capillary structures, the interior of the heat spreader partition is composed of a primary capillary structure and a secondary capillary structure, which increases the coverage area of ​​the capillary structure inside the heat spreader partition, can accelerate the heat conduction rate of the heat exchange medium in the heat spreader partition, and thus improve the heat exchange efficiency of the heat spreader partition. The present application improves the heat exchange rate of the battery module by arranging heat spreaders with high heat exchange efficiency between adjacent battery cells, thereby improving the uniformity of the battery temperature and improving the overall performance of the battery module.

[0032] (5) The battery module provided by the present application is provided with a reinforcement structure on the bottom surface of each battery in the battery module, and the reinforcement structure is bonded to the bottom plate. The surface area of ​​the reinforcement structure is larger than the positive projection area of ​​the reinforcement structure on the top surface, thereby increasing the bonding area between the battery and the bottom plate, so that a stable connection is formed between the battery and the bottom plate. Therefore, even if the battery module shakes or vibrates, or is affected by the high temperature environment inside the battery module, the battery and the bottom plate will not become loose. Furthermore, a heat-spreading partition is further provided between adjacent batteries, and the high temperature heat generated by the battery is further transferred to the heat-spreading partition. The heat-spreading partition is used to improve the problem of large temperature differences between the batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is a schematic diagram of a portion of a battery module according to an embodiment of the present application;

[0034] FIG2 is a schematic diagram of a structure in which a soaking plate and a direct cooling plate are connected according to the first embodiment of the present application;

[0035] FIG3 is a partial enlarged view of FIG2;

[0036] FIG4 is a schematic diagram of another structure of a soaking plate connected to a direct cooling plate provided in Example 1 of the present application;

[0037] FIG5 is a schematic diagram of another structure of the connection between the soaking plate and the direct cooling plate provided in Example 1 of the present application;

[0038] FIG6 is a schematic structural diagram of a housing of a heat soaking baffle provided in Example 1 of the present application from a front view perspective;

[0039] FIG7 is a schematic diagram of the structure of the shell of the heat soaking baffle provided in Example 1 of the present application from a top view;

[0040] FIG8 is a schematic structural diagram of a heat soaking baffle provided in Example 1 of the present application;

[0041] FIG9 is an exploded view of FIG8 ;

[0042] FIG10 is a schematic diagram of another structure of the heat soaking plate provided in Example 1 of the present application;

[0043] FIG11 is an exploded view of FIG10 ;

[0044] FIG12 is a structural schematic diagram of a base of a direct cooling plate provided in Example 1 of the present application;

[0045] FIG13 is another structural schematic diagram of the base of the direct cooling plate provided in Example 1 of the present application;

[0046] FIG14 is a schematic structural diagram of a top cover of a direct cooling plate provided in Example 1 of the present application;

[0047] FIG15 is another structural schematic diagram of the top cover of the direct cooling plate provided in Example 1 of the present application;

[0048] FIG16 is a schematic structural diagram of a battery module provided in Example 1 of the present application;

[0049] FIG17 is another structural schematic diagram of the battery module provided in Example 1 of the present application;

[0050] FIG18 is a schematic diagram of the three-dimensional structure of a battery module provided in yet another embodiment of the present application;

[0051] FIG19 is a schematic cross-sectional view of a direct cooling plate provided in Example 2 of the present application;

[0052] FIG20 is a schematic diagram of another cross-sectional structure of a direct cooling plate provided in Example 2 of the present application;

[0053] FIG21 is a schematic diagram of another cross-sectional structure of a direct cooling plate provided in Example 2 of the present application;

[0054] FIG22 is a schematic diagram of a structure in which a direct cooling plate and a partition are connected according to the second embodiment of the present application;

[0055] FIG23 is a schematic diagram of another structure of the direct cooling plate and the soaking plate connected to each other according to the second embodiment of the present application;

[0056] FIG24 is a schematic structural diagram of a battery module provided in Example 3 of the present application;

[0057] FIG25 is a schematic diagram of the structure of a vapor chamber assembly provided in Example 3 of the present application;

[0058] FIG26 is a schematic diagram of the internal structure of a heat soaking baffle provided in Example 3 of the present application;

[0059] FIG27 is a schematic diagram of a cross-sectional structure of a heat soaking plate provided in Example 3 of the present application;

[0060] FIG28 is a second cross-sectional diagram of another embodiment of the heat soaking plate provided in Example 3 of the present application;

[0061] FIG29 is a schematic diagram of a partial structure of a battery module provided in Example 3 of the present application;

[0062] FIG30 is a cross-sectional schematic diagram of a vapor chamber assembly provided in Example 3 of the present application;

[0063] FIG31 is another cross-sectional schematic diagram of the heat spreader assembly provided in Example 3 of the present application.

[0064] FIG32 is an exploded view of a portion of the structure of a battery module provided in Example 3 of the present application;

[0065] FIG33 is a perspective view of a battery provided by one embodiment of the present application;

[0066] FIG34 is a front view of a battery provided by one embodiment of the present application;

[0067] FIG35 is a partial enlarged view of FIG34;

[0068] FIG36 is a schematic structural diagram of a reinforcement structure provided in Example 4 of the present application;

[0069] FIG37 is another schematic diagram of a reinforcement structure provided in Example 4 of the present application;

[0070] FIG38 is another schematic diagram of a reinforcement structure provided in Example 4 of the present application;

[0071] FIG39 is a front view of a battery provided in Example 4 of the present application;

[0072] FIG40 is a perspective view of a battery provided in Example 4 of the present application;

[0073] FIG41 is a schematic diagram of a structure in which a reinforcement structure is connected to a base plate according to a fourth embodiment of the present application;

[0074] FIG42 is a schematic diagram of another structure in which the reinforcement structure is connected to the base plate according to the fourth embodiment of the present application;

[0075] Figure Number:

[0076] 100. Battery module;

[0077] 10. Battery; 11. First battery; 12. Second battery; 110. Battery pack; 111. First battery pack; 112. Second battery pack; 113. Third battery pack; 114. Fourth battery pack;

[0078] 20a, heat-saturating baffle; 21a, first housing; 211, first end; 212, second end; 213, top wall; 215, opening; 216a, bottom wall; 221, first side wall; 222, second side wall; 223, first inner surface; 224, second inner surface; 23, inner cavity; 231, first cavity; 232, second cavity; 233, third cavity; 24a, capillary element; 241, first capillary element; 242, second capillary element; 243, end of capillary element; 251, first baffle; 252, second baffle; 261, first inlet; 262, first outlet;

[0079] 210, first vapor chamber; 220, second vapor chamber; 230, cooling plate; 27, sealing plate;

[0080] 30a, direct cooling plate; 31a, top cover; 311, protrusion; 312, first side; 313, second side; 32a, base; 331, second inlet; 332, second outlet; 34, flow channel;

[0081] 40. Liquid inlet pipe; 41. Main liquid inlet pipe; 42. Branch liquid inlet pipe; 43. Interface;

[0082] 50. Liquid outlet pipe; 51. Main liquid outlet pipe; 52. Branch liquid outlet pipe; 53. Connector;

[0083] 60. Cooling medium; 61. Uniform cooling medium; 62. Direct cooling medium;

[0084] 30b, direct cooling plate; 31, second housing; 31b, first side plate; 314, first surface; 315, second surface; 32b, second side plate; 35, accommodating cavity; 36, channel tube; 63, heat transfer medium; 371, first inlet; 372, first outlet; 38, fluid channel; 381, first flow channel; 382, ​​second flow channel;

[0085] 20b, soaking plate; 221, first side wall; 223, first inner surface; 222, second side wall; 224, second inner surface; 213, top wall; 215b, open end; 216, bottom wall; 23, inner cavity; 24b, capillary element; 241, first capillary element; 242, second capillary element;

[0086] 200, vapor chamber assembly; 20c, vapor chamber baffle; 201, top; 202, bottom; 21c, first housing; 2111, first cover; 2112, second cover; 24c, capillary element; 244, primary capillary structure; 245, secondary capillary structure; 28, support assembly; 281, support block; 2821, first gap; 2822, second gap; 290, anti-corrosion film layer; 291, hydrophilic film layer; 216c, vapor chamber bottom plate; 2161, multiple grooves; 240, vapor chamber side plate; 250, buffer layer; 300, heat exchange device; 310, liquid cooling plate; 320, heat sink fin;

[0087] 120, box body; 121, box cover; 122, side panel; 123, bottom panel;

[0088] 10. Battery; 13. Casing; 131. Top surface; 132. Bottom surface; 1321. First side; 1322. Second side; 14. Reinforcement structure; 141. First protrusion; 1411. Crest; 1412. Valley; 1413. First type of protrusion; 1414. Second type of protrusion; 70. Adhesive layer. Modes for Carrying Out the Invention

[0089] Example 1

[0090] One embodiment of the present application provides a battery module 100, which can be a cylindrical battery module or a square battery module. The battery module 100 includes a plurality of batteries arranged in a matrix. Specifically, the battery module 100 includes a first direction X and a second direction Y that are perpendicular to each other, wherein a plurality of batteries 10 are arranged side by side along the first direction X to form a battery pack, and a plurality of battery packs are arranged side by side along the second direction Y to form a layer of battery module 100. In an optional example, the battery module 100 may include a single-layer battery module, a double-layer battery module, or a multi-layer battery module.

[0091] The battery module 100 includes a box body and a box cover. A plurality of batteries 10 are arranged in a matrix inside the box body, and the box cover is used to cover the open end of the box body.

[0092] In the field of battery technology, the capacity and charge-discharge rate of the battery module 100 are key factors affecting the performance of the energy storage battery module 100. Increasing the capacity and charge-discharge rate of the battery module 100 is currently a hot topic in the market. However, the volume of the battery module 100 cannot be increased, and the capacity of the battery module 100 can only be increased by increasing the capacity of the battery 10. As the capacity of the battery 10 is greatly increased, the heat generation and passive heat dissipation of the battery 10 become increasingly difficult, resulting in a serious temperature difference in the battery 10. For example, the battery 10 is divided into three regions: upper, middle, and lower. The temperature of the upper region is greater than the temperature of the middle region and greater than the temperature of the lower region. The temperature difference between the upper region and the lower region is 10°C~20°C. This obvious temperature difference will affect the cycle life of the battery 10, especially after the battery 10 is assembled into a module, the difficulty of heat dissipation of the battery 10 will be further increased.

[0093] In the related art, a heat-conducting partition is sandwiched between each battery 10 of the battery module 100, and a liquid cooling plate is set at the bottom of the battery module 100. The heat emitted by each battery 10 is transferred to the liquid cooling plate by the heat-conducting partition and taken away by the liquid cooling plate.

[0094] However, the above-mentioned heat-conducting partition cannot solve the problem of large temperature differences between different areas on the battery 10 , thereby affecting the cycle life of the battery 10 .

[0095] Taking the square battery module 100 as an example, referring to Figures 1, 2, 16 and 17, in one embodiment of the present application, a heat-spreading partition 20 is provided, and the battery module 100 includes a plurality of battery groups arranged in parallel along the second direction Y, each battery group includes a plurality of batteries 10 arranged side by side along the first direction X, and further, each battery group includes a plurality of adjacently arranged first batteries 11 and second batteries 12, and a heat-spreading partition 20 is arranged between each first battery 11 and second battery 12.

[0096] The heat-saturating baffle 20 includes a first shell 21a, which includes a first side wall 221 and a second side wall 222. The first side wall 221 contacts the first battery 11, and the second side wall 222 contacts the second battery 12. The first shell 21a is provided with a hollow inner cavity 23, at least a portion of which is constructed as a closed cavity. The walls enclosing the closed cavity include the first side wall 221 and the second side wall 222. A cooling medium 60 is provided in the closed cavity. The heat-saturating baffle further includes a capillary element 24, which is attached to at least a portion of the inner wall of the first shell 21a, and at least a portion of the capillary element 24 contacts the cooling medium 60. The heat-saturating baffle 20 is configured as a hollow square plate-shaped structure. The first shell 21a includes a first end 211 and a second end 212 arranged opposite to each other, wherein the second end 212 of the first shell 21a is connected to the direct cooling plate 30a.

[0097] Compared with the heat-conducting partitions in the related art, the above-mentioned heat-distributing partition 20 can not only conduct the heat absorbed from the first battery 11 and the second battery 12 to the direct cooling plate 30a, but the heat-distributing partition 20 itself is configured as a hollow structure for the cooling medium 60 to circulate and diffuse. The heat-distributing partition 20 is beneficial to reducing the temperature difference of the battery 10.

[0098] During the operation of the battery module 100, taking the first battery 11 as an example, the heat generated by the first battery 11 is conducted to the first side wall 221, causing the temperature to rise rapidly, thereby forming a heat source area and a cooling area in the cavity. The heat source area can be understood as the area in the cavity away from the direct cooling plate 30a, and the cooling area is the area in the cavity close to the direct cooling plate 30a; the heat source area and the cooling area have obvious temperature changes, that is, the temperature of the heat source area will be significantly higher than that of the cooling area.

[0099] As shown in Figure 3, at least a portion of the capillary element 24 is in contact with the cooling medium 60. This means that the end 243 of the capillary element 24 is encapsulated by the cooling medium 60. Under the action of capillary action, the cooling medium 60 moves against gravity, spreading from the lowest point to the highest point. The cooling medium 60 (in this case, a liquid) in the capillary element 24 absorbs heat energy in the heat source area and transforms from a liquid to a gaseous medium. The gaseous medium quickly fills the entire cavity, enters the cooling area, and rapidly condenses. The condensed cooling medium 60 is then transported against gravity through the capillary element 24. Returning to the vicinity of the heat source area, the cooling medium 60 continues to absorb heat generated by the battery, thus achieving a gas-liquid cycle.

[0100] By utilizing the heat-dissipating partition 20 to improve the heat dissipation performance, the temperature in the upper area of ​​the battery is prevented from being too high, and the temperature of the upper, middle and lower areas of the battery is roughly balanced.

[0101] A heat-equalizing partition 20 is used to separate the first battery 11 and the second battery 12, wherein at least a portion of the inner cavity of the heat-equalizing partition 20 is configured as a closed cavity, and the walls enclosing the closed cavity include a first side wall 221 and a second side wall 222, wherein the first side wall 221 is in contact with the first battery 11, and the second side wall 222 is in contact with the second battery 12. A cooling medium 60 is provided in the closed cavity of the heat-equalizing partition 20, and the heat generated by the first battery 11 and the second battery 12 is transferred to the heat-equalizing partition 20 through the first side wall 221 and the second side wall 222 respectively. A portion of the liquid cooling medium 60 inside the heat-equalizing partition 20 absorbs the heat and then vaporizes and rapidly expands within the entire closed cavity. The vaporized cooling medium 60 contacts the direct cooling plate 30a at the second end 212 of the first shell 21a and is cooled to form condensate. The condensed cooling medium 60 diffuses on the inner wall of the shell through the capillary element 24, thereby forming a heat-equalizing structure on the inner wall of the first shell 21a. Another part of the liquid cooling medium 60 inside the heat-equalizing baffle 20 diffuses through the capillary element 24 after absorbing heat, thereby making the temperatures of various areas where the closed cavity of the heat-equalizing baffle 20 is located close to the same. Correspondingly, the temperatures of the single cells in contact with different areas of the heat-equalizing baffle 20 tend to be consistent after heat exchange with the heat-equalizing baffle 20, thereby effectively reducing the problem of large temperature differences in different areas of the single cells.

[0102] The capillary element 24 of the present embodiment is a structure designed mainly based on the theory of capillary phenomenon. Capillary phenomenon is a well-known phenomenon. Capillary phenomenon (sometimes called capillary action, capillary motion, capillary rise, capillary effect or wicking) is the process of liquid flowing in a narrow space without any external force, and even in opposition to external forces such as gravity.

[0103] This effect can be seen between the bristles of a paintbrush, in a thin tube, in porous materials like paper and plaster, in some non-porous materials like sand and liquefied carbon fiber, or even in a biological cell. It occurs due to intermolecular forces between the liquid and the surrounding solid surface. If the diameter of the tube is small enough, surface tension (caused by cohesive forces within the liquid) and adhesion forces between the liquid and the container's walls work together to propel the liquid.

[0104] Furthermore, in an embodiment provided in the present application, as shown in Figure 2, the entire inner cavity 23 of the heat-averaging baffle 20 is configured as a closed cavity, the first shell 21a includes a top wall 213 arranged at the first end 211, and the first shell 21a also includes a plurality of side walls connected to the top wall 213. The second end 212 of the first shell 21a can be configured as an open end, and the cooling medium 60 is injected into the inner cavity 23 of the first shell 21a through the opening 215 of the second end 212, and then the second end 212 of the first shell 21a is welded to the direct cooling plate 30a, so that the inner cavity 23 of the heat-averaging baffle 20 is configured as a sealed cavity.

[0105] In another embodiment provided in the present application, as shown in Figure 4, the heat-averaging baffle 20 is configured as a hollow inverted T-shaped plate structure. Different from the above embodiment, the second end 212 of the first shell 21a is provided with a bottom wall 216a, and the bottom wall 216a is arranged opposite to the top wall 213. The cooling medium 60 is injected into the inner cavity 23 of the first shell 21a through the opening 215 of the second end 212, and then the bottom wall 216a is welded to the second end 212 of the first shell 21a, so that the inner cavity 23 of the heat-averaging baffle 20 is configured as a sealed cavity, and the bottom wall 216a is further connected to the direct cooling plate 30a, wherein the connection method of the bottom wall 216a and the direct cooling plate 30a can be welding, clamping or bonding.

[0106] The cooling medium 60 inside the heat-averaging baffle 20 exchanges heat with the direct cooling plate 30a at the second end 212. When the second end 212 of the heat-averaging baffle 20 is provided with a bottom wall 216a, the orthographic projection area of ​​the bottom wall 216a on the direct cooling plate 30a is greater than the orthographic projection area of ​​the top wall 213 on the direct cooling plate 30a. By increasing the contact area between the bottom wall 216a and the direct cooling plate 30a, the heat exchange efficiency between the heat-averaging baffle and the direct cooling plate 30a can be increased.

[0107] The cooling medium 60 includes a liquid or a refrigerant, which can be Freon or ammonia, etc. The cooling medium 60 is configured to circulate between a liquid phase and a gaseous phase. The initial state of the cooling medium 60 is liquid. When the heat generated by the first battery 11 and the second battery 12 is transferred to the liquid cooling medium 60, the liquid cooling medium 60 absorbs the heat and is converted into a gaseous cooling medium 60. The gaseous cooling medium 60 circulates and diffuses rapidly in the closed cavity of the heat-equalizing baffle 20. Therefore, even if the temperature of a certain part of the battery 10 is too high, after the heat generated by this part of the battery 10 is transferred to the cooling medium 60, the cooling medium 60 vaporizes and rapidly diffuses into the entire sealed cavity of the heat-equalizing baffle 20. Since the heat-equalizing baffle 20 is constructed as a heat-equalizing plate structure as a whole, after the heat generated by this part of the battery 10 is fully exchanged with the heat-equalizing baffle 20, the temperature of this part of the battery 10 is configured to remain the same as the temperature of the entire battery 10.

[0108] The first shell 21a can be made of a metal material that is conducive to heat conduction. Suitable metal materials include copper, aluminum, titanium and stainless steel. The first shell 21a can also be made of a composite metal material. Suitable composite metal materials include copper-aluminum composite materials or copper-nickel composite materials.

[0109] The size of the above-mentioned heat-equalizing partition 20 can be adaptively adjusted according to the size of the battery module 100. For example, when the volume of the battery module 100 is large, the size of the heat-equalizing partition 20 can be increased accordingly, and correspondingly, the wall thickness of the first shell 21a of the heat-equalizing partition 20 and the volume of the inner cavity 23 of the heat-equalizing partition 20 can also be increased accordingly, thereby increasing the heat conductivity and temperature equalization effect of the heat-equalizing partition 20. When the volume of the battery module 100 is small, the size of the heat-equalizing partition 20 is reduced accordingly, and correspondingly, the wall thickness of the first shell 21a of the heat-equalizing partition 20 and the volume of the inner cavity 23 of the heat-equalizing partition 20 are also reduced, which is conducive to the miniaturization design of the battery module 100.

[0110] In a further preferred embodiment, the heat-sparging baffle 20 can improve the heat dissipation effect of the battery module 100, as shown in Figures 2 and 3. Specifically, a capillary element 24 is provided in the inner cavity 23 of the heat-sparging baffle 20, the first side wall 221 includes a first inner surface 223, and the second side wall 222 includes a second inner surface 224. A first capillary element 241 and a second capillary element 242 are provided in the inner cavity 23 of the heat-sparging baffle 20, wherein the first capillary element 241 is arranged in contact with the first inner surface 223, and the second capillary element 242 is arranged in contact with the second inner surface 224. The liquid cooling medium 60 can diffuse rapidly on the first inner surface 223 through the first capillary element 241, and the liquid cooling medium 60 can diffuse rapidly on the second inner surface 224 through the second capillary element 242.

[0111] After the gaseous cooling medium 60 contacts the direct cooling plate 30a at the second end 212 of the first shell 21a, due to the low temperature of the direct cooling plate 30a, the gaseous cooling medium 60 condenses into a liquid cooling medium 60 after being cooled. During the condensation process of the cooling medium 60, the heat carried by the gaseous cooling medium 60 is transferred to the direct cooling plate 30a. The cooling medium 60 condensed into a liquid flows on the first inner surface 223 through the first capillary element 241, thereby cooling the first inner surface 223 and cooling the first battery 11 through the wall where the first inner surface 223 is located. The cooling medium 60 condensed into a liquid flows on the second inner surface 224 through the second capillary element 242, thereby cooling the second inner surface 224 and cooling the second battery 12 through the wall where the second inner surface 224 is located.

[0112] The capillary element 24 can be made of fiber cotton material, which is bonded to the inner surface of the heat-equalizing baffle 20. The interior of the fiber cotton material has a rich mesh structure, which is conducive to the rapid flow of liquid cooling medium 60 inside the fiber cotton.

[0113] The above-mentioned capillary element 24 can also be made of a mixture of metal powder and solution to form a metal powder slurry, which is bonded to the inner wall of the heat-distributing baffle 20 through a spraying process. Suitable metal powders include copper powder. Copper powder has good hydrophilicity. The capillary structure formed by copper powder not only has strong capillary force but also good thermal conductivity, which can effectively improve the heat dissipation effect of the heat-distributing baffle 20.

[0114] In the present application, the cooling medium 60 includes a direct cooling medium 62 and a uniform cooling medium 61, wherein the direct cooling medium 62 is defined as flowing in from the inlet of the flow channel and flowing out from the outlet of the flow channel, and the uniform cooling medium 61 is defined as adding the uniform cooling medium 61 into the sealed cavity, and the uniform cooling medium 61 is configured to flow only inside the cavity. The uniform cooling medium 61 includes a liquid or a refrigerant, and the refrigerant can be Freon or ammonia, etc. The uniform cooling medium 61 has a liquid phase and a gas phase. The liquid uniform cooling medium 61 will be converted into a gaseous uniform cooling medium 61 after absorbing heat. The gaseous uniform cooling medium 61 will quickly diffuse rapidly in its accommodating space, so that the temperature difference of the accommodating space where the uniform cooling medium 61 is located is relatively small. The direct cooling medium 62 includes a liquid or air. After absorbing heat, the direct cooling medium 62 takes away the heat with the help of its flow properties, thereby dissipating heat from the battery module 100.

[0115] In another embodiment provided in the present application, as shown in Figure 5, a part of the inner cavity of the heat-equalizing baffle 20 is constructed as a closed cavity, in which a first cooling medium is arranged, and another part of the inner cavity of the heat-equalizing baffle 20 is constructed as a direct cooling plate structure, in which a second cooling medium is arranged. Specifically, the internal intervals of the above-mentioned heat-equalizing baffle 20 are provided with a first partition 251 and a second partition 252, and the inner cavity 23 of the first shell 21a is divided into a first cavity 231, a second cavity 232 and a third cavity 233 in sequence, wherein the first partition 251 is used to separate the first cavity 231 and the second cavity 232, and the second partition 252 is used to separate the second cavity 232 and the third cavity 233.

[0116] Among them, the first cavity 231 and the second cavity 232 are constructed as closed cavities, the first cavity 231 is arranged close to the first battery 11, and the third cavity 233 is arranged close to the second battery 12. A first cooling medium is arranged inside the first cavity 231 and the third cavity 233, and a second cooling medium is arranged inside the second cavity 232, wherein the first cooling medium is configured as an evenly cooled medium 61, and the second cooling medium is configured as a direct cooling medium 62. The evenly cooled medium 61 arranged inside the first cavity 231 is configured to flow only inside the first cavity 231, and the evenly cooled medium 61 arranged inside the third cavity 233 is configured to flow only inside the third cavity 233, and the direct cooling medium 62 inside the second cavity 232 is configured to flow in from the outside of the second cavity 232, and the direct cooling medium 62 is configured to flow out to the outside of the second cavity 232.

[0117] In a further preferred embodiment, under the premise that the size of the heat-absorbing baffle 20b is maintained within a suitable size range, a suitable volume ratio is set between the first cavity 231, the second cavity 232 and the third cavity 233, that is, the volume of the first cavity 231: the volume of the second cavity 232: the volume of the third cavity 233 is 1:X:1, where 1≤X≤2. Since the volumes of the first battery 11 and the second battery 12 are substantially the same, the volume of the first cavity 231 for absorbing and dissipating heat for the first battery 11 is substantially the same as the volume of the third cavity 233 for absorbing and dissipating heat for the second battery 12, thereby maintaining the overall temperature of the first battery 11 and the second battery 12. Basically the same, and the volume of the second cavity 232 is greater than the volume of the first cavity 231, or the volume of the second cavity 232 is greater than the volume of the third cavity 233, which is beneficial to improving the overall heat dissipation performance of the heat-equalizing baffle 20. Furthermore, if the ratio of the volume of the second cavity 232 to the volume of the first cavity 231 is greater than 2, the overall size design of the heat-equalizing baffle 20b will be too large, which is not conducive to the overall miniaturization design of the battery module 100. It is understandable that the ratio of the volume of the second cavity 232 to the volume of the first cavity 231 can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 and any value between the above two values.

[0118] In a further preferred embodiment, the ratio of the volume of the first cavity 231 : the volume of the second cavity 232 : the volume of the third cavity 233 is 1:1.5:1.

[0119] A first capillary element 241 is provided on the inner wall of the first cavity 231 near the first battery 11, and a third cavity 233 is provided near the second battery 12. A second capillary element 242 is provided on the inner wall of the third cavity 233 near the second battery 12. The first cavity 231 and the third cavity 233 are configured as sealed cavities, wherein the heat generated by the first battery 11 is circulated and diffused through the cooling medium 61 inside the first cavity 231 of the heat-equalizing baffle 20, thereby making the overall temperature difference of the first battery 11 relatively small. The heat generated by the second battery 12 is circulated and diffused through the cooling medium 61 inside the third cavity 233 of the heat-equalizing baffle 20, thereby making the overall temperature difference of the second battery 12 small.

[0120] As shown in Figures 6 and 7, the heat equalizing baffle 20 includes a first inlet 261 and a first outlet 262. The direct cooling medium 62 can enter the second cavity 232 through the first inlet 261 and flow out of the second cavity 232 through the first outlet 262, wherein the second cavity 232 is arranged between the first cavity 231 and the third cavity 233, so that the heat inside the first cavity 231 and the third cavity 233 can be quickly transferred to the second cavity 232, and the heat is circulated and dissipated through the flow of the direct cooling medium 62 inside the second cavity 232.

[0121] One of the first inlet 261 and the first outlet 262 of the heat-equalizing baffle 20 is disposed on the side wall of the first baffle 251 , and the other of the first inlet 261 and the first outlet 262 of the heat-equalizing baffle 20 is disposed on the side wall of the second baffle 252 .

[0122] With further reference to Figures 8 to 9, the heat-spreading baffle 20 includes a first heat-spreading plate 210, a cooling plate 230 and a second heat-spreading plate 220 which are combined with each other. The first heat-spreading plate 210 is provided with a hollow first cavity 231, the cooling plate 230 is provided with a hollow second cavity 232, and the second heat-spreading plate 220 is provided with a hollow third cavity 233. The first heat-spreading plate 210 and the cooling plate 230 are welded together to form the first baffle 251 through a joining wall, and the second heat-spreading plate 230 and the second heat-spreading plate 220 are welded together to form the second baffle 252 through a joining wall. As shown in Figure 8, a first outlet 262 is provided at the top end of the first baffle 251, and a first inlet 261 is provided at the bottom end of the second baffle 252.

[0123] Further referring to Figures 10 to 11, the heat soaking plate 20 includes a first heat soaking plate 210 and a second heat soaking plate 220 that are combined with each other. The first heat soaking plate 210 is provided with a hollow first cavity 231, and the second heat soaking plate 220 is provided with a hollow third cavity 233. The first heat soaking plate 210 and the second heat soaking plate 220 are combined by welding a sealing plate 27. The first heat soaking plate 210 includes a first side wall 221 and a first side wall 221. The first partition 251, the second heat spreader 220 includes a second partition 252 and a second side wall 222 arranged opposite to the second partition 252. The first partition 251, the second partition 252 and a plurality of sealing plates 27 for connecting the first heat spreader 210 and the second heat spreader 220 form a second cavity 232. As shown in Figure 10, a first outlet 262 is provided at the top end of the first partition 251, and a first inlet 261 is provided at the bottom end of the second partition 252.

[0124] A liquid inlet pipe 40 and a liquid outlet pipe 50 are provided inside the battery module 100 , wherein a branch of the liquid inlet pipe 40 is connected to the first inlet 261 of the heat-equalizing baffle 20 , and a branch of the liquid outlet pipe 50 is connected to the first outlet 262 of the heat-equalizing baffle 20 .

[0125] The second end 212 of the heat-equalizing baffle 20 is connected to a direct cooling plate 30a provided at the bottom of the battery module 100 . In one embodiment of the present application, a direct cooling plate 30a structure is further provided, which is conducive to rapid heat dissipation of the battery module 100 .

[0126] With further reference to Figures 2 to 5 and Figures 12 and 13, the direct cooling plate 30a includes a base 32, wherein a flow channel 34 is provided on the base 32, and the flow channel 34 is configured as a plurality of grooves provided on the base 32. The base 32 is also provided with a second inlet 331 and a second outlet 332. The direct cooling medium 62 can enter the flow channel 34 inside the direct cooling plate 30a through the second inlet 331. The heat transferred to the direct cooling plate 30a by the above-mentioned heat equalizing baffle 20 is absorbed by the direct cooling medium 62. The flow channel 34 inside the above-mentioned direct cooling plate 30a is extended as much as possible by repeated circuitous extension, so that the direct cooling medium 62 can fully absorb the heat of the heat equalizing baffle 20 and flow out through the second outlet 332.

[0127] As shown in Figure 12, in one embodiment provided in the present application, the flow channel 34 on the direct cooling plate 30a can be set to extend in an S-shaped circuitous manner, and a second inlet 331 of the flow channel 34 is provided at the bottom end of one side of the base 32, and a second outlet 332 of the flow channel 34 is provided at the top end of the other side of the base 32.

[0128] With further reference to FIG13 , in another embodiment provided in the present application, the flow channel 34 of the direct cooling plate 30a includes two main channels and several branch channels, wherein the two main channels extend in a direction parallel to the side of the direct cooling plate 30a, and several branch channels are arranged perpendicular to the main channels, and several branch channels are connected to the two main channels. A second inlet 331 is provided on one side of the bottom end surface of the base 32, and a second outlet 332 is provided on the other side of the top end surface of the base 32, wherein the second inlet 331 is connected to one of the main channels, and the second outlet 332 is connected to the other main channel.

[0129] As shown in Figures 14 and 15, the direct cooling plate 30a further includes a top cover 31a, which is used to cover the flow channel 34 on the base 32, so that the flow channel 34 is connected to the outside only through the second inlet 331 and the second outlet 332. The top cover 31a includes a first side surface 312 and a second side surface 313 that are oppositely arranged, wherein the first side surface 312 is in contact with the heat-dissipating baffle 20, and the second side surface 313 is arranged opposite to the flow channel 34 on the base 32. 3 is also provided with a plurality of protrusions 311, which are used to increase the contact area between the direct cooling medium 62 and the second side surface 313. Since the heat conducted from the first battery 11 and the second battery 12 to the heat-equalizing baffle 20 is mainly dissipated through the top cover 31a of the direct cooling plate 30a, the plurality of protrusions 311 are provided on the top cover 31a. This structure is beneficial to improving the heat transfer efficiency between the top cover 31a and the direct cooling medium 62, thereby enhancing the heat absorption effect of the top cover 31a on the heat-equalizing baffle 20.

[0130] It should be noted that the flow channel 34 inside the direct cooling plate 30 a is defined by the base 32 and the top cover 31 a , and the plurality of protrusions 311 are located in the flow channel 34 , thereby increasing the contact area between the direct cooling medium 62 and the top cover 31 a .

[0131] In an example provided in the present application, the cross-section of the above-mentioned bump 311 structure can be circular, as shown in Figure 14, several bumps 311 have approximately the same cross-sectional area, and adjacent bumps 311 maintain approximately the same spacing, which is conducive to uniform heat dissipation of the battery module 100.

[0132] In another example provided in the present application, the cross-section of the bump 311 structure may be rectangular, as shown in FIG. 15 , and the bumps 311 are spaced approximately the same distance apart, thereby facilitating uniform heat dissipation of the battery module 100 .

[0133] In one embodiment provided in the present application, the inner cavity 23 of the heat-equalizing partition 20 is divided into three cavities, wherein the first cavity 231 close to the first battery 11 is provided with a cooling medium 61, the third cavity 233 close to the second battery 12 is provided with a cooling medium 61, the second cavity 232 located between the first cavity 231 and the third cavity 233 is provided with a direct cooling medium 62, and the interior of the direct cooling plate 30a connected to the second end 212 of the heat-equalizing partition 20 is provided with a direct cooling medium 62.

[0134] When the direct cooling medium 62 is configured as a liquid, the battery module 100 further includes a liquid inlet pipe 40 and a liquid outlet pipe 50, wherein one branch of the liquid inlet pipe 40 is connected to the heat-equalizing baffle 20, another branch of the liquid inlet pipe 40 is connected to the direct cooling plate 30a, one branch of the liquid outlet pipe 50 is connected to the heat-equalizing baffle 20, another branch of the liquid outlet pipe 50 is connected to the direct cooling plate 30a, the second inlet 331 of the flow channel 34 of the direct cooling plate 30a is connected to the first inlet 261 of the second cavity 232 of the heat-equalizing baffle 20, and the second outlet 332 of the flow channel 34 of the direct cooling plate 30a is connected to the first outlet 262 of the second cavity 232 of the heat-equalizing baffle 20. When the direct cooling medium 62 is injected into the direct cooling plate 30a, a portion of the direct cooling medium 62 enters the second cavity 232 of the heat equalizing baffle 20 through the liquid inlet pipe 40 and flows, and a portion of the direct cooling medium 62 enters the flow channel 34 of the direct cooling plate 30a through the liquid inlet pipe 40 and flows. The direct cooling medium 62 simultaneously enters the interior of the second cavity 232 of the heat equalizing baffle 20 and the flow channel 34 of the direct cooling plate 30a and flows, and one end of the heat equalizing baffle 20 is connected to the direct cooling plate 30a so that the heat absorbed by the heat equalizing baffle 20 from the first battery 11 and the second battery 12 is transferred to the direct cooling plate 30a, thereby effectively improving the heat dissipation efficiency of the battery module 100.

[0135] As shown in Figure 16, in an example provided in the present application, when the battery module 100 is configured as a single-layer battery module 100, a heat-equalizing partition 20 is used to separate the first battery 11 and the second battery 12 in each battery group 110, and a group of heat-equalizing partitions 20 is provided in each battery group. The number of heat-equalizing partitions 20 provided inside the battery module 100 is basically the same as the number of batteries 10, and a liquid inlet pipe 40 is provided on one side of the battery module 100, and a liquid outlet pipe 50 is provided on the other side of the battery module 100. The liquid inlet pipe 40 includes a main liquid inlet pipe 41 and several branch liquid inlet pipes 42, each branch liquid inlet pipe 42 is provided with several interfaces 43, each interface 43 is connected to the first inlet 261 of the second cavity 232 of a heat-equalizing partition 20, wherein the number of branch liquid inlet pipes 42 is the same as the number of groups of heat-equalizing partitions 20, and the number of interfaces 43 of the branch liquid inlet pipes 42 is the same as the number of each group of heat-equalizing partitions 20. The liquid outlet pipe 50 includes a main liquid outlet pipe 51 and several branch liquid outlet pipes 52, each branch liquid outlet pipe 52 is provided with several joints 53, each joint 53 is connected to the first outlet 262 of the second cavity 232 of a heat equalizing partition 20, wherein the number of branch liquid outlet pipes 52 is the same as the number of groups of heat equalizing partitions 20, and the number of interfaces 43 of the branch liquid outlet pipes 52 is the same as the number of each group of heat equalizing partitions 20.

[0136] With further reference to FIG17 , when the battery module 100 is configured as a multi-layer battery module 100, a heat-equalizing partition 20 can be used to simultaneously separate multiple groups of first batteries 11 and second batteries 12. The battery module 100 includes four battery groups, each battery group 110 includes five batteries, and five heat-equalizing partitions 20 are provided in the battery module 100. Each heat-equalizing partition 20 is used to simultaneously separate the first battery 11 and the second battery 12 in the first group of batteries 111, the first battery 11 and the second battery 12 in the second group of batteries 112, the first battery 11 and the second battery 12 in the third group of batteries 113, and the first battery 11 and the second battery 12 in the fourth group of batteries 114. A liquid inlet pipe 40 is provided on one side of the battery module 100, and a liquid outlet pipe 50 is provided on the other side of the battery module 100. The liquid inlet pipe 40 includes a plurality of interfaces 43, each interface 43 is connected to the first inlet 261 of the second cavity 232 of a heat-equalizing baffle 20, and the number of interfaces 43 of the liquid inlet pipe 40 is the same as the number of heat-equalizing baffles 20. The liquid outlet pipe 50 is provided with a plurality of joints 53, each joint 53 is connected to the first outlet 262 of the second cavity 232 of a heat-equalizing baffle 20, wherein the number of joints 53 of the liquid outlet pipe 50 is the same as the number of heat-equalizing baffles 20.

[0137] Additionally, in a multi-layer battery module, a heat-absorbing barrier 20 may be provided between the first battery 11 and the second battery 12 in each battery pack 110 .

[0138] In an embodiment of the present application, a battery pack is further provided, which includes a plurality of the above-mentioned battery modules 100. The plurality of battery modules 100 can be arranged to be connected in parallel or in series, or the plurality of battery modules 100 can be arranged to be mixedly connected.

[0139] Example 2

[0140] An embodiment of the present application provides a battery module 100 . The battery module 100 may be a cylindrical battery module or a square battery module. The battery module 100 includes a plurality of batteries arranged in a matrix.

[0141] As shown in reference figure 18, the battery module 100 includes a first direction and a second direction perpendicular to each other, wherein a plurality of batteries 10 are arranged side by side along the first direction to form a battery pack, and a plurality of battery packs are arranged side by side along the second direction to form a layer of battery module 100. In an optional example, the battery module 100 may include a single-layer battery module, a double-layer battery module or a multi-layer battery module.

[0142] The battery module 100 includes a box body and a box cover. A plurality of batteries 10 are arranged in a matrix inside the box body, and the box cover is used to cover the open end of the box body.

[0143] In the field of battery technology, battery capacity and charge and discharge rate are key factors affecting the performance of energy storage batteries. Increasing battery capacity and charge and discharge rate is a hot topic in the current market. With the significant increase in battery capacity, the heat generation and passive heat dissipation of the battery are becoming increasingly difficult.

[0144] In the related art, a heat-conducting partition is sandwiched between each single battery of the battery module 100, and a liquid cooling plate is provided at the bottom of the battery module 100. The heat emitted by each battery is transferred to the liquid cooling plate by the heat-conducting partition and carried away by the liquid cooling plate. The liquid cooling plate includes a flow channel plate and a top cover. The top cover is used to absorb the heat generated by the heat-conducting partition. The flow channel plate is provided with a fluid channel for the flow of the cooling medium. However, the battery module 100 using the above-mentioned liquid cooling plate structure still has a serious problem of heat generation, and may even cause a serious phenomenon of thermal runaway of the battery module 100.

[0145] Referring to FIG. 19 to FIG. 23 , a direct cooling plate 30 b structure is provided in an embodiment of the present application. The direct cooling plate 30 b includes:

[0146] The second housing 31 is provided with a hollow accommodating cavity 35;

[0147] The channel tube 36 is disposed in the accommodating cavity 35 of the second shell 31. The inner cavity of the channel tube 36 is defined as a fluid channel 38. The fluid channel 38 is used for the flow of the direct cooling medium.

[0148] The heat-conducting medium 63 is used to fill the gap between the channel tube 36 and the second shell 31 .

[0149] Since the inner cavity of the direct cooling plate 30b is provided with a channel tube 36 for the flow of the direct cooling medium, a heat-conducting medium 63 is also provided between the channel tube 36 and the gap between the second shell 31 of the direct cooling plate 30b. After the heat generated by the battery is transferred to the second shell 31 of the direct cooling plate 30b through the partition 30, the heat-conducting medium 63 can quickly absorb the heat of the second shell 31 and then transfer the heat to the channel tube 36 through the heat-conducting medium 63. By arranging the heat-conducting medium 63 inside the direct cooling plate 30b, the heat absorption performance of the direct cooling plate 30b can be effectively improved, thereby effectively alleviating the serious heating problem of the battery.

[0150] Furthermore, if the above-mentioned heat-conducting medium 63 is not provided in the gap between the second shell 31 and the channel tube 36, the gap between the second shell 31 and the channel tube 36 will be filled with air, and the thermal conductivity of air is 0.026 W / (m·K). Therefore, the thermal conductivity of air is low, which will cause the heat absorbed by the second shell 31 of the direct cooling plate 30b from the partition 30 to be unable to be quickly transferred to the channel tube 36, thereby significantly reducing the heat dissipation efficiency of the direct cooling plate 30b.

[0151] In some embodiments of the present application, the heat-conducting medium 63 can be a paste-like liquid. The paste-like liquid heat-conducting medium 63 has good wettability and can effectively fill the gap between the second shell 31 and the channel tube 36; the heat-conducting medium 63 can also be a solid heat-conducting gasket. The solid heat-conducting gasket has good flexibility and elasticity, so the solid heat-conducting gasket can be used to fully cover the uneven surface of the second shell 31 or the channel tube 36; the heat-conducting medium 63 can also be a heat-conducting gel. The heat-conducting gel is used to apply or fill the surface of the second shell 31 and the channel tube 36 to form a uniform heat-conducting layer. The heat-conducting gel has the effect of filling the concave and convex structure of the surface of the second shell 31 or the channel tube 36, thereby achieving a uniform heat-conducting effect.

[0152] Furthermore, the heat-conducting medium 63 includes a mixture of a base material and a heat-conducting filler. Depending on the mixing ratio of the base material and the heat-conducting filler, the heat-conducting medium 63 has different thermal conductivity coefficients. In a preferred embodiment, the thermal conductivity coefficient of the heat-conducting medium 63 used in this application is 1 W / (m·K) to 10 W / (m·K).

[0153] In some embodiments of the present application, the base material forming the heat-conducting medium 63 includes silica gel or resin, and the heat-conducting filler forming the heat-conducting medium 63 includes metal powder or ceramic powder. The metal suitable for forming the metal powder is preferably copper or aluminum.

[0154] Furthermore, the heat-conducting medium 63 is configured to be arranged around the outer surface of the channel tube 36, and a uniform heat-conducting medium layer is formed on the outer surface of the channel tube 36 by coating or winding. The channel tube 36 is wrapped by the heat-conducting medium 63, so that the heat is evenly distributed on the outer periphery of the channel tube 36, thereby maintaining the uniformity of the heat dissipation effect of the channel tube 36 and improving the uniformity of the heat dissipation performance of the battery module 100.

[0155] Furthermore, the second shell 31 of the direct cooling plate 30b includes a first side plate 31b and a second side plate 32b arranged opposite to each other, the accommodating cavity 35 is located between the first side plate 31b and the second side plate 32b, the channel tube 36 is arranged in the accommodating cavity 35, and the first side plate 31b is used to cover the open end of the second side plate 32b.

[0156] Furthermore, the first side plate 31b includes a first surface 314 and a first surface 315 that are disposed opposite each other. The first surface 314 is connected to the partition plate 30, and the first surface 315 is disposed adjacent to the heat-conducting medium 63. Heat generated by the first and second batteries 11 and 12 is transferred to the first surface 314 of the first side plate 31b via the partition plate 30, and further transferred to the heat-conducting medium 63 via the first surface 315 of the first side plate 31b. Due to the excellent heat absorption properties of the heat-conducting medium 63, the heat generated by the batteries can be quickly absorbed by the direct cooling plate 30b.

[0157] Furthermore, as shown in Figures 19 to 21 , a portion of the first surface 315 of the first side plate 31b contacts the heat-conducting medium 63, and / or another portion of the first surface 315 of the first side plate 31b contacts the outer wall of the channel tube 36. The portion of the first side plate 31b in contact with the channel tube 36 can directly transfer heat absorbed by the first side plate 31b to the channel tube 36, and the portion of the first side plate 31b in contact with the heat-absorbing medium can transfer heat absorbed by the first side plate 31b to the heat-absorbing medium.

[0158] The direct cooling plate 30b also includes a first inlet 371 and a first outlet 372. The direct cooling medium enters the interior of the fluid channel 38 through the first inlet 371, undergoes sufficient heat exchange inside the direct cooling plate 30b, and then fully absorbs the heat of the battery and flows out to the outside of the direct cooling plate 30b through the first outlet 372.

[0159] Furthermore, the total volume of the fluid channel 38 inside the channel tube 36 is larger than the total volume for accommodating the heat-absorbing medium defined by the gap between the channel tube 36 and the second shell 31, so that most of the volume of the inner cavity of the direct cooling plate 30b is used for the flow of the direct cooling medium.

[0160] As shown in Figure 19, in an example provided in the present application, the channel tube 36 includes a fluid channel 38, the cross-section of the channel tube 36 includes multiple discs, adjacent discs are connected, the top wall 213 of the channel tube 36 is in contact with the first surface 315 of the first side plate 31b, and the gap between the two adjacent discs is filled with a heat-conducting medium 63.

[0161] As shown in Figure 20, in another example provided in the present application, the channel tube 36 includes one or more fluid channels 38, and the channel tube 36 extends roughly in an S-shaped spiral. Therefore, the fluid channel 38 inside the channel tube 36 extends roughly in an S-shaped spiral, which is conducive to forming sufficient contact between the direct cooling medium inside the fluid channel 38 and the inner wall of the channel tube 36, thereby improving the heat dissipation effect of the channel tube 36.

[0162] As shown in Figure 21, in another example provided in the present application, the channel tube 36 includes a plurality of fluid channels 38, and the plurality of fluid channels 38 are distributed in a dendritic manner. The dendritic fluid channels 38 include a first channel 381 and a second channel 382 connected to each other, wherein the extension direction of the first channel 381 is substantially the same as the flow direction of the direct cooling medium, and the second channel 382 is configured to be formed by bifurcating the end of the first channel 381 to form a plurality of branch channels, and the inlet and outlet of the branch channels are provided with corners, while the extension direction of the main part of the branch channel remains the same as the flow direction of the direct cooling medium, wherein the number of branch channels included in the second channel 382 can be 2, 3, or 4. The direct cooling medium enters the first channel 381 through the first inlet 371 and enters the plurality of second channels 382 through the first channel 381. The dendritic fluid channel 38 structure can effectively improve the uniformity of the heat exchange effect of the direct cooling medium. It is understandable that the temperature of the direct cooling medium entering the first flow channel 381 is lower than the temperature of the direct cooling medium in the second flow channel 382 , thereby effectively improving the heat exchange effect of the second flow channel 382 by increasing the heat transfer area of ​​the second flow channel 382 .

[0163] When the channel tube 36 includes multiple flow channels or multiple branch flow channels, the heat conductive medium 63 is also used to fill the gaps between adjacent flow channels and adjacent branch flow channels, so that the channel tube 36 where each flow channel inside the direct cooling plate 30b is located is surrounded by the heat conductive medium 63, thereby improving the thermal conductivity and uniformity of the direct cooling plate 30b.

[0164] The first side plate 31b and the second side plate 32b are made of a metal material with excellent thermal conductivity. The metal material suitable for preparing the first side plate 31b and the second side plate 32b includes an aluminum alloy material, wherein the thermal conductivity of the aluminum alloy material is 200 W / (m·K) to 350 W / (m·K), and the thermal conductivity of the heat-conducting medium 63 is 1 W / (m·K) to 10 W / (m·K). In an example provided in the present application, the first side plate 31b and the second side plate 32b are made of the same aluminum alloy material, and the thermal conductivity of the aluminum alloy material used to form the first side plate 31b and the second side plate 32b is 330 W / (m·K), and the thermal conductivity of the heat-conducting medium 63 is 2 W / (m·K).

[0165] It is understandable that the thermal conductivity of the aluminum alloy material used to form the first side plate 31b and the second side plate 32b can also be 210W / (m·K), 220W / (m·K), 230W / (m·K), 240W / (m·K), 250W / (m·K), 260W / (m·K), 270W / (m·K), 280W / (m·K), 290W / (m·K), 300W / (m·K), 310W / (m·K), 320W / (m·K), 340W / (m·K) and values ​​between any two of the above values.

[0166] The thermal conductivity of the heat-conducting medium 63 can also be 3W / (m·K), 4W / (m·K), 5W / (m·K), 6W / (m·K), 7W / (m·K), 8W / (m·K), 9W / (m·K) and a value between any two of the above values.

[0167] Further referring to Figure 18, the battery module 100 includes a plurality of battery packs arranged in parallel, each battery pack includes a plurality of batteries arranged side by side, and further, each battery pack includes a plurality of adjacently arranged first batteries 11 and second batteries 12, and a partition is arranged between each first battery 11 and second battery 12, and the end of the partition is connected to the direct cooling plate 30b.

[0168] The partition can be a solid plate-shaped body, which includes a first side surface and a second side surface arranged opposite to each other. The first side surface contacts the first battery 11 and the second side surface contacts the second battery 12. The heat generated by the first battery 11 and the second battery 12 is quickly transferred to each other.

[0169] In one embodiment of the present application, a heat-equalizing partition 20b structure is also provided. Compared with ordinary heat-conducting partitions, the heat-equalizing partition 20b can not only absorb and conduct the heat generated by the first battery 11 and the second battery 12, but also help to improve the problem of increased temperature difference between different areas of the first battery 11 and different areas of the second battery 12.

[0170] Specifically, the heat soaking plate 20b includes a plate body, which is provided with a hollow inner cavity 23. At least a portion of the inner cavity 23 of the plate body is configured as a closed cavity. The walls enclosing the closed cavity include a first side wall 221 and a second side wall 312. The first side wall 221 contacts the first battery 11, and the second side wall 312 contacts the second battery 12.

[0171] A cooling medium is built into the closed cavity;

[0172] A capillary element 24b is attached to at least a portion of the inner wall of the cavity, and a distal end of the capillary element 24b is in contact with the cooling medium;

[0173] The cooling medium is built into the closed cavity, and the heat generated by the first battery 11 is transferred to the cooling medium inside the heat-equalizing partition 20b through the wall where the first side wall 221 is located, and the heat generated by the second battery 12 is transferred to the cooling medium inside the heat-equalizing partition 20b through the wall where the second side wall 312 is located. The cooling medium at the high-temperature heat source of the first battery 11 or the second battery 12 vaporizes after absorbing the heat generated by the first battery 11 or the second battery 12, and circulates and diffuses in the inner cavity 23 of the heat-equalizing partition, and the vaporized cooling medium contacts the direct cooling plate 30b, and the heat of the vaporized cooling medium is absorbed by the direct cooling plate 30b and then cooled to form condensate. The condensed cooling medium The cold medium diffuses on the inner wall of the plate through the capillary element 24b and reaches the high-temperature heat source. The cold medium circulates vapor and liquid in the closed cavity of the heat-equalizing partition 20b. The capillary element 24b promotes the rapid diffusion of condensed liquid on the inner wall of the plate. Therefore, the heat generated by the local high temperature of the battery is absorbed by the cold medium and then diffused and further absorbed by the condensed cold medium to be reduced, so that the heat-equalizing partition 20b is configured as a plate-shaped structure with a relatively small temperature difference, wherein the first battery 11 exchanges heat with the first side wall 221 of the heat-equalizing partition 20b, and the second battery 12 exchanges heat with the second side wall 312 of the heat-equalizing partition 20b, thereby reducing the temperature difference of the batteries.

[0174] In the present application, the cooling medium includes a direct cooling medium and a uniform cooling medium, wherein the direct cooling medium is defined as flowing in from the inlet of the flow channel and flowing out from the outlet of the flow channel, and the uniform cooling medium is defined as adding the uniform cooling medium into the sealed cavity, and the uniform cooling medium is configured to flow only inside the cavity. The uniform cooling medium includes water or a refrigerant, and the refrigerant can be Freon or ammonia, etc. The uniform cooling medium has a liquid phase and a gas phase. The liquid uniform cooling medium will be converted into a gaseous uniform cooling medium after absorbing heat. The gaseous uniform cooling medium will quickly diffuse rapidly in its accommodation space, so that the temperature difference of the accommodation space where the uniform cooling medium is located is relatively small. The direct cooling medium includes water or air. After absorbing heat, the direct cooling medium takes away the heat with the help of its flow properties, thereby dissipating heat from the battery module 100.

[0175] Further referring to Figure 22, the plate body of the heat-averaging partition 20b includes a top wall 213 and an open end 215b arranged opposite to the top wall 213, the top wall 213 is connected to the top of the first side wall 221 and the second side wall 312, the open end 215b is connected to the direct cooling plate 30b and is covered by the direct cooling plate 30b, and the welding method of the heat-averaging partition 20b and the direct cooling plate 30b is preferably welding.

[0176] Further referring to Figure 23, the plate body of the heat equalizing partition 20b includes a top wall 213 and a bottom wall 216 arranged opposite to the top wall 213, the tops of the first side wall 221 and the second side wall 312 are connected to the top wall 213, the bottoms of the first side wall 221 and the second side wall 312 are connected to the bottom wall 216, and the bottom wall 216 is connected to the direct cooling plate 30b. The connection method between the bottom wall 216 and the direct cooling plate 30b can be any one of welding, clamping or bonding.

[0177] In a further preferred implementation, the area of ​​the orthographic projection of the top wall 213 of the heat-averaging baffle 20b on the direct cooling plate 30b is smaller than the area of ​​the orthographic projection of the bottom wall 216 on the direct cooling plate 30b. By increasing the contact area between the bottom wall 216 and the direct cooling plate 30b, the heat exchange efficiency between the heat-averaging baffle 20b and the direct cooling plate 30b is improved.

[0178] The material used to prepare the heat-dissipating baffle 20b can be made of metal materials that are conducive to heat conduction. Suitable metal materials include copper, aluminum, titanium and stainless steel. The heat-dissipating baffle 20b can also be made of composite metal materials. Suitable composite metal materials include copper-aluminum composite materials or copper-nickel composite materials.

[0179] The capillary element 24b can be made of fiber cotton material, which is bonded to the inner surface of the heat-equalizing partition 20b. The interior of the fiber cotton material has a rich mesh structure, which is conducive to the rapid flow of liquid cooling medium inside the fiber cotton.

[0180] The above-mentioned capillary element 24b can also be made of a mixture of metal powder and solution to form a metal powder slurry, which is combined on the inner wall of the heat-distributing baffle 20b through a spraying process. Suitable metal powders include copper powder. Copper powder has good hydrophilicity. The capillary structure formed by copper powder not only has strong capillary force but also good thermal conductivity, which can effectively improve the heat dissipation effect of the heat-distributing baffle 20b.

[0181] Furthermore, the first side wall 221 of the plate body includes a first inner surface 223, and the second side wall 312 includes a second inner surface 224. A first capillary element 241 and a second capillary element 242 are arranged in the inner cavity 23 of the heat-averaging baffle 20b, wherein the first capillary element 241 is arranged in contact with the first inner surface 223, and the second capillary element 242 is arranged in contact with the second inner surface 224. The liquid cooling medium can diffuse rapidly on the first inner surface 223 through the first capillary element 241, and the liquid cooling medium can diffuse rapidly on the second inner surface 224 through the second capillary element 242.

[0182] The direct cooling plate 10 provided by the implementation of the present application can also be integrated on the bottom plate of a single battery, thereby providing heat dissipation for the single battery.

[0183] An embodiment of the present application also provides a battery pack, which includes multiple battery modules. The multiple battery modules are arranged in series, parallel or mixed to meet the usage requirements of the battery pack. The battery pack is used in electrical equipment or the battery pack is used in power tools.

[0184] Example 3

[0185] As shown in FIG24 , a battery module provided in the present application includes a battery cell group and a heat spreader assembly.

[0186] The battery pack includes a plurality of batteries 10 arranged along a first direction (i.e., the X direction in the figure). The battery 10 has a first and a second opposing surface, as well as first and second opposing side surfaces located between the first and second surfaces, and a top and a bottom opposing surface. The surface areas of the first and second surfaces are both greater than the surface areas of the first, second, top, and bottom surfaces. In other words, the first and second surfaces represent the larger areas of the battery 10.

[0187] The first direction (i.e., the X direction in the figure) can be the thickness direction of the battery 10, and the battery cell also includes a second direction (i.e., the Y direction in the figure) and a third direction (i.e., the Z direction in the figure), the second direction is the direction from the first side surface to the second side surface, and the third direction is the direction from the bottom surface to the top surface, wherein the second direction and the third direction are both perpendicular to the first direction, and the third direction is perpendicular to the second direction.

[0188] The vapor chamber assembly includes a vapor chamber 20c and a vapor chamber bottom plate 216c. The vapor chamber 20c is positioned between adjacent batteries 10. It should be noted that at least one vapor chamber 20c can be positioned between two adjacent batteries 10, and one vapor chamber 20c can be positioned on the outer sides of the batteries 10 at both ends of the cell group, away from the middle battery 10.

[0189] In the present application, the heat-equalizing baffle 20c can be arranged on the first surface and the second surface of the battery 10. Even if the heat-equalizing baffle 20c is in contact with a larger surface area of ​​the battery 10, the contact area between the battery 10 and the heat-equalizing baffle 20c is increased to improve the heat exchange rate of the battery 10. At the same time, the heat dissipation path between the batteries 10 can be shortened to ensure temperature uniformity between the batteries 10.

[0190] As shown in Figures 26 and 27, the heat-dissipating baffle 20c includes a first shell 21c, within which a capillary element 24b is disposed. The capillary element 24b comprises a primary capillary structure 244 and a secondary capillary structure 245. A working medium is also disposed within the first shell 21c. The first shell 21c defines a first cavity. The primary capillary structure 244 and the secondary capillary structure 245 are spaced apart within the first cavity, and the cross-sectional area of ​​the primary capillary structure 244 is greater than that of the secondary capillary structure 245. The cross-sectional area may be the area of ​​a cross-section of the capillary structure along the XY plane. The working medium is disposed within the first cavity and transfers heat through a phase change. For example, a liquid working medium absorbs heat and then transforms into a gaseous working medium, with heat conversion occurring during the phase change. Both the primary capillary structure 244 and the secondary capillary structure 245 are configured to adsorb the working medium, which is contained within the first cavity.

[0191] The material of the first shell 21c can be metal, such as copper alloy, aluminum alloy, or magnesium alloy. The material of the first shell 21c can also be other materials with good thermal conductivity, without limitation. The materials of the primary capillary structure 244 and the secondary capillary structure 245 can be capillary fiber materials, but are not limited thereto. The working fluid can be water, ethanol, acetone, etc., but are not limited thereto.

[0192] Along the third direction, the heat distribution baffle 20 c has a top 201 and a bottom 202 opposite to each other, and the primary capillary structure 244 and the secondary capillary structure 245 both extend from the bottom 202 to the top 201 . When the heat-equalizing baffle 20c is working, the liquid working medium is sucked in from one end of the primary capillary structure 244 and the secondary capillary structure 245 located at the bottom 202, and diffuses from the bottom 202 toward the top 201. During the diffusion process, the liquid working medium simultaneously absorbs the heat of the battery 10 to form a gaseous working medium and diffuses into the first cavity. When the gaseous working medium circulates to the bottom 202 of the heat-equalizing baffle 20c, it cools down and turns into liquid again. The formed liquid working medium is again sucked in from the bottom 202 of the primary capillary structure 244 and the secondary capillary structure 245, diffuses, exchanges heat, and vaporizes. This cycle is repeated to realize the heat exchange function of the heat-equalizing baffle 20c, thereby absorbing the heat of the battery 10 and maintaining the temperature balance of the battery 10.

[0193] The interior of a traditional heat-equalizing baffle usually only includes a main capillary structure, and there are large gaps between the main capillary structures. The heat conduction rate in the gaps is slow, resulting in uneven heat exchange. The interior of the heat-equalizing baffle 20c of the present application includes the main capillary structure 244 and the secondary capillary structure 245 arranged at intervals. The secondary capillary structure 245 is used to absorb the working fluid between adjacent main capillary structures 244. Compared with the traditional heat-equalizing baffle structure, the interior of the heat-equalizing baffle 20c of the present application is composed of the main capillary structure 244 and the secondary capillary structure 245, which increases the coverage area of ​​the capillary structure inside the heat-equalizing baffle 20c, can accelerate the heat conduction rate and heat exchange uniformity of the working fluid in the heat baffle 210, and thus improve the heat exchange efficiency of the heat-equalizing baffle 20c.

[0194] In one embodiment, as shown in FIG26 , the primary capillary structure 244 can extend linearly from the bottom 202 to the top 201 , for example, the primary capillary structure 244 can be a linear structure extending along the third direction; the secondary capillary structure 245 can extend curvedly from the bottom 202 to the top 201 , for example, the secondary capillary structure 245 can be a serpentine structure extending in the third direction. The secondary capillary structure 245 can be located between adjacent primary capillary structures 244 and arranged in a curved shape, thereby increasing the coverage area of ​​the secondary capillary structure 245 , further improving the absorption rate and heat conduction rate of the working medium within the heat-spreading baffle 20 c , and effectively enhancing the heat exchange rate and heat exchange uniformity of the heat-spreading baffle 20 c .

[0195] In one embodiment, as shown in FIG26 , the heat spreader assembly further includes a plurality of groups of support assemblies 28 arranged at intervals, and the support assemblies 28 are arranged in the first shell 21c. For example, the plurality of groups of support assemblies 28 may be arranged at intervals along the second direction. Each group of the support assemblies 28 includes a plurality of support blocks 281 arranged in an array. For example, each group of the support assemblies 28 may include a plurality of columns of support blocks arranged along the second direction and a plurality of rows of support blocks arranged along the third direction. As shown in FIG26 , in the first direction, the support block 281 has opposite ends, and the two ends of the support block 281 respectively abut against the inner wall of the first shell. The support block 281 is located in the first cavity and is supported between the first surface and the second surface to support the first cavity and prevent the first shell from deforming. The cross-sectional shape of the support block 281 may be square, circular, triangular, etc., which is not limited here.

[0196] In one embodiment, as shown in Figures 25 and 26, a first gap 2821 is provided between two adjacent groups of support assemblies 28. Within each group of support assemblies 28, a second gap 217 is provided between adjacent support blocks 281. The cross-sectional area of ​​the first gap 2821 is greater than the cross-sectional area of ​​the second gap 217. The primary capillary structure 244 is disposed within the first gap 2821, and the secondary capillary structure 245 is disposed within the second gap 217. The first gap 2821 may be a linear gap extending along the third direction, with the primary capillary structure 244 being linear and housed within the first gap 2821. The second gap 217 may be a longitudinal gap extending along the third direction between two adjacent columns of support blocks 281, or a transverse gap extending along the second direction between two adjacent rows of support blocks 281. The secondary capillary structure 245 is interspersed in a curved shape within the second gap 217 between the support blocks 281.

[0197] It should be noted that the support blocks 281 in the support assembly 28 can also be arranged non-periodically, that is, irregularly, and the first gap 2821 and the second gap 217 can also be non-linear gaps. The specific design can be based on actual process requirements and is not specifically limited here.

[0198] In one embodiment, as shown in FIG27 , the first shell 21c includes a first cover plate 2111 and a second cover plate 2112, and the first cover plate 2111 and the second cover plate 2112 are connected to form the first shell having a cavity. The cross-sections of the first cover plate 2111 and the second cover plate 2112 can be "L"-shaped, "U"-shaped, or "I"-shaped, etc. For example, the first shell can be a structure having a rectangular cavity formed by fastening two "L"-shaped cover plates, or a structure having a rectangular cavity formed by connecting two "U"-shaped cover plates, or a structure having a rectangular cavity formed by connecting a "U"-shaped cover plate and a "I"-shaped cover plate, and no specific limitation is made here.

[0199] In one embodiment, the support block 281 is fixed to the first cover plate 2111 and / or the second cover plate 2112, and the primary capillary structure 244 and the secondary capillary structure 245 are fixed to the first cover plate 2111 and / or the second cover plate 2112. In the present application, the support block 281 can be an integral structure with the first cover plate 2111 or the second cover plate 2112. The support block 281 can also be a separate structure from the first cover plate 2111 or the second cover plate 2112, and the support block 281 can be fixed to the first cover plate 2111 or the second cover plate 2112 by welding or bonding. The primary capillary structure 244 and the secondary capillary structure 245 may be fixed on the first cover plate 2111 or the second cover plate 2112 , or the primary capillary structure 244 and the secondary capillary structure 245 may be fixed on both the first cover plate 2111 and the second cover plate 2112 to ensure the stability of the primary capillary structure 244 and the secondary capillary structure 245 .

[0200] It should be noted that the first side wall 221 and the second side wall 222 in Example 1 are configured as part of the first cover plate 2111, or the first side wall 221 and the second side wall 222 in Example 1 are configured as part of the second cover plate 2112, or one of the first side wall 221 and the second side wall 222 in Example 1 is configured as part of the first cover plate 2111, and the other one of the first side wall 221 and the second side wall 222 is configured as part of the second cover plate 2112.

[0201] In one embodiment, as shown in FIG27 , an anti-corrosion film layer 290 is provided on the inner wall of the first shell 21 c , and the anti-corrosion film layer 290 is used to prevent the working medium from contacting the inner wall of the first shell 21 c and causing corrosion to the first shell 21 c .

[0202] In one embodiment, as shown in FIG27 , a hydrophilic film layer 291 is provided on the surface of the anti-corrosion film layer 290 facing the first cavity. The hydrophilic film layer 291 is used to improve the fluidity of the working medium on the inner wall of the first shell 21 c to improve the heat exchange efficiency.

[0203] Specifically, as shown in Figure 27, when the first shell 21c is formed by docking the first cover plate 2111 and the second cover plate 2112, a first anti-corrosion film layer can be set on the inner wall of the first cover plate 2111, and a first hydrophilic film layer can be set on the surface of the first anti-corrosion film layer facing the first cavity; a second anti-corrosion film layer can be set on the inner wall of the second cover plate 2112, and a second hydrophilic film layer can be set on the surface of the second anti-corrosion film layer facing the first cavity. The material and structure of the first anti-corrosion film layer and the second anti-corrosion film layer can be the same, and the material and structure of the first hydrophilic film and the second hydrophilic film layer can be the same.

[0204] In one embodiment, as shown in FIG28 , two heat-spreading plates 20c may be disposed between adjacent batteries 10, and a buffer layer 250 may be disposed between the two adjacent heat-spreading plates 20c. Because the batteries 10 may squeeze the heat-spreading plates 20c during expansion, affecting the heat exchange performance of the heat-spreading plates 20c, two heat-spreading plates 20c may be disposed between two adjacent batteries 10, and a buffer layer 250 may be disposed between the two adjacent heat-spreading plates 20c. The buffer layer 250 is used to moderately release the expansion force of the batteries 10, thereby preventing the expansion force of the batteries 10 from squeezing and damaging the heat-spreading plates 20c.

[0205] The vapor chamber assembly further includes a vapor chamber bottom plate 216c, which is disposed on the bottom surface of the battery 10. The vapor chamber bottom plate 216c can exchange heat with the bottom surface of the battery cell assembly and support the vapor chamber baffle 20c. The structure of the vapor chamber bottom plate 216c can be the same as that of the vapor chamber baffle 20c. The specific structure of the vapor chamber bottom plate 216c can refer to the specific structure of the vapor chamber baffle 20c described above and will not be further described here.

[0206] In one embodiment, as shown in Figure 29, a plurality of grooves 2161 are provided on the side of the soaking plate 216c facing the soaking baffle 20c. The grooves 2161 extend along the second direction and are parallel to each other and spaced apart. The end of the soaking baffle 20c closest to the soaking plate 216c is inserted into the grooves 2161, with each groove 2161 corresponding to one soaking baffle 20c, thereby ensuring the stability of the soaking baffle 20c.

[0207] In one embodiment, as shown in Figure 29, the first cavity of the heat-equalizing baffle 20c is an independent, enclosed structure, and the working medium is disposed within the first cavity. Specifically, the working medium can be disposed at the bottom of the first cavity, i.e., near one end of the heat-equalizing bottom plate 216c. When the heat-equalizing baffle 20c is operating, the working medium at the bottom of the first cavity is drawn in from the bottom of the primary capillary structure 244 and the secondary capillary structure 245, and diffuses from the bottom 202 toward the top 201. During the diffusion process, the liquid working medium simultaneously absorbs heat from the battery 10 to form a gaseous working medium, which then diffuses into the first cavity. When the gaseous working medium circulates to the bottom of the first cavity, it cools down and becomes liquid again. The resulting liquid working medium is then drawn in again from the bottom of the primary capillary structure 244 and the secondary capillary structure 245, diffuses, exchanges heat, and vaporizes. In this embodiment, the gas-liquid conversion and circulation of the working medium are both completed within the first cavity.

[0208] In one embodiment, as shown in FIG30 , the heat-saturating base plate 216c includes a second shell, the second shell has a second cavity, the first cavity is connected to the second cavity, and the working medium is disposed in the second cavity. Specifically, the heat-saturating baffle 20c and the heat-saturating base plate 216c can be an integrated structure, and the first cavity is connected to the second cavity. In this embodiment, the primary capillary structure 244 and the secondary capillary structure 245 in the heat-saturating baffle 20c absorb the working medium from the heat-saturating base plate 216c, and the working medium diffuses into the first cavity and becomes gaseous after absorbing heat. When the gaseous working medium circulates to the bottom of the first cavity, the gaseous working medium cools down and becomes liquid again and flows into the second cavity, and is then recycled again.

[0209] In some embodiments, the heat-saturating baffle 20c and the heat-saturating bottom plate 216c may also be independent structures, and the heat-saturating baffle 20c may be fixed to the heat-saturating bottom plate 216c by welding or bonding.

[0210] As shown in Figures 24 and 25, the heat spreader assembly further includes heat spreader side plates 240. The heat spreader side plates 240 are located on opposite sides of the cell group along the second direction, affixed to the first side surface or the second side surface of the battery 10, and exchange heat with the side surfaces of the battery 10 to further improve the heat exchange efficiency of the battery module. The structure of the heat spreader side plates 240 can be the same as that of the heat spreader baffle 20c. The specific structure of the heat spreader side plates 240 can refer to the specific structure of the heat spreader baffle 20c described above and will not be repeated here.

[0211] As shown in FIG. 24 , the battery module further includes a heat exchange device 300 , which is disposed on a side of the heat-spreading bottom plate 216 c away from the heat-spreading partition 20 c .

[0212] In one embodiment, as shown in FIG25 , the heat exchange device 300 may be a liquid cooling plate 310, wherein one side surface of the liquid cooling plate 310 is in close contact with the side surface of the heat-spreading bottom plate 216c away from the battery cell group, and heat is exchanged with the battery cell group to further improve the heat exchange efficiency of the battery module. Specifically, a fluid channel is provided inside the liquid cooling plate 310, and an inlet and an outlet of a cooling medium are provided at both ends of the liquid cooling plate 310. The cooling medium flows through the fluid channel to take away the heat of the battery 10, thereby realizing a heat exchange function. The material of the liquid cooling plate 310 may be a metal, such as an aluminum alloy, but is not limited thereto. The cooling medium may be water, ethanol, acetone, etc., but is not limited thereto.

[0213] In one embodiment, the heat exchange device 300 may be a heat sink fin 320. The heat sink fin 320 is disposed on a surface of the soaking plate 216c away from the battery cell group to dissipate heat from the battery cell group, thereby further improving the heat exchange efficiency of the battery module. The heat sink fin 320 may be made of metal, such as, but not limited to, aluminum alloy.

[0214] Furthermore, a heat-conducting layer is provided between the heat exchange device 300 and the soaking plate 216c to improve the heat transfer efficiency therebetween. The material of the heat-conducting layer may be, but is not limited to, thermal grease. For example, the heat-conducting layer may be provided between the liquid cooling plate 310 and the soaking plate 216c, or between the heat sink fins 320 and the soaking plate 216c.

[0215] In some embodiments, as shown in Figure 31, the battery module may include a liquid cooling plate 310 and the heat dissipation fins 320 at the same time. The liquid cooling plate 310 may be arranged on the side of the heat spreader 216c away from the battery cell group, and the heat dissipation fins 320 may be arranged on the side of the battery cell group or on the bottom surface of the battery cell group, without limitation.

[0216] In summary, the present application provides a battery module, which includes a heat spreader assembly, the heat spreader assembly includes a heat spreader partition, the heat spreader partition includes a main capillary structure and a secondary capillary structure arranged at intervals, the secondary capillary structure is used to absorb the heat exchange medium between adjacent main capillary structures, the heat spreader partition is composed of a main capillary structure and a secondary capillary structure, which increases the coverage area of ​​the capillary structure inside the heat spreader partition, can accelerate the heat conduction rate of the heat exchange medium in the heat spreader partition, so as to improve the heat exchange efficiency of the heat spreader partition, the present application improves the heat exchange rate of the battery module by arranging heat spreaders with high heat exchange efficiency between adjacent battery cells, thereby improving the uniformity of the battery cell temperature and improving the overall performance of the battery module.

[0217] Example 4

[0218] An embodiment of the present application provides a battery module 100 , which may be a cylindrical battery module or a square battery module. The battery module 100 includes a plurality of batteries 10 arranged in a matrix.

[0219] As shown in reference figure 32, the battery module 100 includes a plurality of batteries 10, and the battery module 100 includes a first direction and a second direction perpendicular to each other, wherein the plurality of batteries 10 are arranged side by side along the first direction to form a battery pack, and the plurality of battery packs are arranged side by side along the second direction to form a layer of battery module 100. In an optional example, the battery module 100 may include a single-layer battery module, a double-layer battery module or a multi-layer battery module.

[0220] The battery module 100 includes a housing 120 and a cover 121. Multiple batteries 10 are arranged in a matrix within the housing 120. The cover 121 covers the open end of the housing 120. The housing 120 further includes a bottom plate 123 positioned opposite the cover 121. The housing 120 also includes multiple side plates 122. The tops of the side plates 122 are connected to the cover 121, and the bottoms of the side plates 122 are connected to the bottom plate 123.

[0221] In the battery module 100, a plurality of batteries 10 are arranged in sequence to form a battery pack, and adjacent batteries 10 are firmly connected by bonding. The bottom surface of each battery 10 is connected to the bottom plate 123 by bonding. In the related art, the battery 10 and the bottom plate 123 are mainly bonded by adhesive, that is, adhesive is applied to the bottom plate 123 or the bottom of the battery 10, and then an adhesive layer 70 is formed between the battery 10 and the bottom plate 123. The bottom surface 132 of the battery 10, the bottom plate 123, and the adhesive layer 70 formed between the battery 10 and the bottom plate 123 are all The planar structures cooperate with each other. During the use of the battery module 100, the internal environment and external environment of the battery module 100 will affect the stability of the adhesive layer 70. For example, if the internal temperature of the battery module 100 increases or the outside of the battery module 100 shakes or vibrates, the adhesive layer 70 between the battery 10 and the base plate 123 will be offset, thereby destroying the stability of the adhesion between the battery 10 and the base plate 123. As time goes by, the battery module 100 and the base plate 123 will become loose, thereby affecting the normal operation of the battery module 100.

[0222] In one embodiment provided in the present application, the bottom structure of the outer shell 13 of the battery 10 is optimized to form a stable connection between the battery 10 and the bottom plate 123. Referring to Figures 33 to 42, the battery 10 includes a outer shell 13, and the outer shell 13 has a top surface 131 and a bottom surface 132 that are relatively arranged. The bottom surface 132 is also provided with a reinforcement structure 14, and the reinforcement structure 14 is used to be connected to the bottom plate 123. The surface area of ​​the reinforcement structure 14 is larger than the positive projection area of ​​the reinforcement structure on the top surface 131, thereby increasing the bonding area between the battery 10 and the bottom plate 123, so that a stable connection is formed between the battery 10 and the bottom plate 123. Therefore, when the battery module 100 shakes or vibrates, or is affected by the high temperature environment inside the battery module 100, the battery 10 and the bottom plate 123 will not become loose.

[0223] In some embodiments provided in the present application, the reinforcement structure 14 includes a plurality of first protrusions 141 or a plurality of grooves. By setting the reinforcement structure 14 on the bottom surface 132 of the battery 10, the reinforcement structure 14 is set as a non-planar structure such as a plurality of protrusions or grooves, and is bonded to the bottom plate 123 through the reinforcement structure 14. On the one hand, the concave-convex or groove structure has a larger surface area than the planar structure, thereby increasing the bonding area between the battery 10 and the bottom plate 123. On the other hand, the bonding layer 70 between the bottom surface 132 of the battery 10 and the bottom plate 123 is configured as a non-planar structure. The non-planar bonding layer 70 structure is tighter and more stable than the planar bonding layer 70 structure. Therefore, when the battery module 100 shakes or vibrates, or is affected by the high temperature environment inside the battery module 100, resistance will be generated between the bonding layer 70 of the non-planar structure and the bottom surface 132 of the battery 10, thereby preventing the bonding layer 70 from loosening.

[0224] Further referring to Figures 34 and 35, in one embodiment provided in the present application, the reinforcement structure 14 includes a plurality of first protrusions 141, and the plurality of first protrusions 141 are configured to extend in a wave shape. By providing a plurality of continuous first protrusion 141 structures, the bonding area between the battery 10 and the base plate 123 is further increased.

[0225] Further, as shown in FIG35 , each first protrusion 141 includes a crest 1411 and a trough 1412. The height difference h between the crests 1411 and the troughs 1412 of the plurality of first protrusions 141 is the same. The crest 1411 is the highest point of the reinforcement structure 14 relative to the plane where the bottom surface 132 is located, and the trough 1412 is the lowest point of the reinforcement structure 14 relative to the plane where the bottom surface 132 is located. The gaps between adjacent crests 1411 and troughs 1412 are used to fill the adhesive. The height difference between the crest 1411 and the trough 1412 can control the bonding strength between each first protrusion 141 of the battery 10 and the bottom plate 123. If the height difference between the crest 1411 and the trough 1412 of a part of the first protrusions 141 is smaller, less adhesive will be filled on the first protrusions 141 of that part, resulting in weaker bonding strength between the first protrusions 141 of that part and the bottom plate 123, making it easy for the first protrusions 141 of that part to loosen.

[0226] With further reference to Figures 36 to 42 , in some embodiments provided in the present application, the reinforcement structure 14 includes a plurality of first protrusions 141 or first grooves, and the cross-sections of the plurality of first protrusions 141 or first grooves may also be circular, triangular or quadrilateral structures.

[0227] As shown in Figure 36, when the cross-section of multiple first protrusions 141 or first grooves is set to be circular, intervals can be set between adjacent first protrusions 141 or first grooves, and the distance of the intervals is as small as possible, which is conducive to setting multiple first protrusions 141 or first grooves on the bottom surface 132 of the battery 10.

[0228] As shown in FIG37 , when the cross-sections of the plurality of first protrusions 141 or first grooves are configured as rectangles, taking the first protrusions 141 as an example, each first protrusion 141 may extend along the first side 1321 of the bottom surface of the battery 10, or may extend along the second side 1322 of the bottom surface, wherein the first side 1321 and the second side are perpendicularly connected. Furthermore, the length of the first protrusion 141 extending along the first side 1321 may be equal to the length of the first side 1321, or the length of the first protrusion 141 extending along the second side 1322 may be equal to the length of the second side 1322. Furthermore, the cross-sectional areas of the plurality of first protrusions 141 are substantially the same, and the spacing between adjacent first protrusions 141 is substantially the same, thereby facilitating that the same volume of adhesive is filled between adjacent first protrusions 141.

[0229] As shown in Figure 38, when the cross-section of multiple first protrusions 141 or first grooves is set to be rectangular, taking the first protrusion 141 as an example, the first protrusion 141 includes adjacently arranged first-type protrusions 1413 and second-type protrusions 1414, wherein the first-type protrusions 1413 and the second-type protrusions 1414 both extend along the first side 1321 or the first-type protrusions 1413 and the second-type protrusions 1414 both extend along the second side 1322. Taking the example of the first-type protrusions 1413 and the second-type protrusions both extending along the first side 1321, the orthographic projection of the first-type protrusions 1413 on the first side 1321 does not coincide with the orthographic projection of the second-type protrusions 1414 on the first side 1321, and the sum of the length of the first-type protrusions 1413 extending along the first side 1321 and the length of the second-type protrusions 1414 extending along the first side 1321 is equal to the length of the first side 1321. The intervals between adjacent first-type protrusions 1413 remain the same, and the intervals between adjacent second-type protrusions 1414 remain the same, so that the capacity of adhesive that can be filled between adjacent first-type protrusions 1413 is basically the same, and the capacity of adhesive that can be filled between adjacent second-type protrusions 1414 is basically the same.

[0230] Further referring to Figures 39 and 40, when the battery 10 is configured as a square battery, the reinforcement structure 14 is configured as a plurality of first protrusions 141, and the bottom surface 132 of the battery 10 includes a first side 1321 and a second side 1322 vertically connected, wherein the length of the first side 1321 is less than the length of the second side 1322, and the plurality of first protrusions 141 extend along the extension direction of the first side 1321, thereby facilitating the provision of a larger number of protrusion structures on the bottom surface 132 of the battery 10.

[0231] In some other embodiments provided herein, the reinforcement structure 14 includes an inclined plane, which can be a flat inclined plane, i.e., the slope of each part of the inclined plane remains fixed, or the inclined plane can be a trapezoidal extending inclined plane, i.e., the slopes of different parts of the inclined plane are different. When the reinforcement structure 14 is set as an inclined plane, the surface area of ​​the inclined plane is greater than its positive projection area, thereby increasing the bonding area between the reinforcement structure 14 and the base plate 123. Furthermore, when the reinforcement structure 14 is set as a trapezoidal extending inclined plane, the bonding layer 70 formed between the reinforcement structure 14 and the base plate 123 is configured as a non-planar structure, so that resistance is formed between the bonding layer and the outer surface of the reinforcement structure 14, thereby preventing the bonding layer from loosening.

[0232] A reinforcement structure 14 is provided on the bottom surface 132 of the shell 13. When the reinforcement structure 14 is provided as a plurality of first protrusions 141, the reinforcement structure 14 can be integrally formed with the shell 13, or the reinforcement structure 14 can be connected to the bottom surface 132 of the shell 13 by welding.

[0233] Further referring to Figures 41 and 42, the battery 10 is bonded to the base plate 123 through the reinforcement structure 14. The base plate 123 of the battery module 100 is usually integrated with the liquid cooling plate. Therefore, in addition to supporting and fixing the battery 10, the base plate 123 of the battery module 100 also has a heat dissipation function. Setting the bottom surface 132 of the battery 10 as a non-planar structure is beneficial to increasing the contact area between the bottom surface 132 of the battery 10 and the base plate 123, and thus helps to increase the heat transfer efficiency between the battery 10 and the base plate 123.

[0234] Furthermore, the adhesive between the battery 10 and the bottom plate 123 is configured as a thermally conductive adhesive. Compared to conventional adhesives, the thermally conductive adhesive can quickly transfer heat from the battery 10 to the bottom plate 123, thereby improving the heat dissipation efficiency of the battery module 100. The thermally conductive adhesive not only has a bonding effect, but also can quickly transfer heat from the battery 10 to the bottom plate 123.

[0235] As shown in FIG41 , in one embodiment provided herein, the reinforcement layer includes a plurality of first protrusions 141 , each having a trapezoidal cross-section. The top surfaces of the first protrusions 141 are in contact with the base plate 123 , and thermally conductive adhesive fills the gaps between adjacent first protrusions 141 . Multiple first protrusions 141 are in contact with the base plate 123 , allowing the base plate 123 to directly support the battery 10 . This increases support strength compared to transitional support provided by the adhesive layer 70 . Furthermore, the first protrusions 141 have a sufficient height to allow sufficient thermally conductive adhesive to fill between adjacent first protrusions 141 , thereby enhancing the stability of the bond between the base plate 123 and the battery 10 .

[0236] Further referring to Figure 42, in another embodiment provided in the present application, the reinforcement layer includes a plurality of first protrusions 141, and the cross-section of the first protrusion 141 is set to a trapezoidal structure. Different from the above embodiment, the top surface 131 of the first protrusion 141 is not in direct contact with the bottom plate 123. A part of the thermal conductive adhesive is filled in the gap between adjacent first protrusions 141, and another part of the thermal conductive adhesive is filled in the gap between the first protrusion 141 and the bottom plate 123. The protrusion height of the first protrusion 141 can be appropriately reduced. On the one hand, it is conducive to the miniaturized design of the battery module 100. On the other hand, it is conducive to increasing the contact area between the thermal conductive adhesive and the first protrusion 141, thereby helping to improve the heat dissipation efficiency.

[0237] In some other embodiments provided in the present application, one side of the base plate 123 used to support the battery 10 is also configured as a non-planar structure, and a plurality of second protrusions or a plurality of second grooves are provided on the base plate 123, wherein the plurality of second grooves cooperate with the plurality of first protrusions 141, or the second protrusions can be inserted into a portion of the gap between adjacent first protrusions 141, or the plurality of second protrusions can be inserted into the plurality of first grooves. Compared with the bonding layer 70 formed between the two planes, the bonding layer 70 formed between the two non-planar surfaces has a tighter bonding effect, and the heat transfer area formed between the two non-planar surfaces can also be further increased, thereby increasing the heat transfer area between the battery 10 and the base plate 123.

[0238] An embodiment of the present application also provides a battery pack, which includes multiple battery modules. The multiple battery modules are arranged in series, parallel or mixed to meet the usage requirements of the battery pack. The battery pack is used in electrical equipment or the battery pack is used in power tools.

Claims

1. A soaking plate for a battery module, the battery module comprising the soaking plate, a battery and a direct cooling plate, the soaking plate being arranged between any two of the batteries, the soaking plate comprising: A first shell, wherein a first cavity is disposed inside the first shell, at least a portion of the first cavity is configured as a closed cavity, and the walls enclosing the closed cavity include a first side wall and a second side wall, the first side wall contacts one of the two batteries, and the second side wall contacts the other of the two batteries; A cooling medium is built into the closed cavity; A capillary element is attached to at least a portion of the inner surface of the first side wall or at least a portion of the inner surface of the second side wall, and at least a portion of the capillary element is in contact with the cooling medium; The first shell includes a first end and a second end that are arranged opposite to each other, and the second end of the first shell is connected to the direct cooling plate.

2. The heat-saturating baffle according to claim 1, wherein: The first end of the first shell is provided with a top wall, and the second end is provided as an open end, the top wall is connected to the tops of the first side wall and the second side wall, and the open end is connected to the direct cooling plate and is covered by the direct cooling plate.

3. The heat-saturating baffle according to claim 1, wherein: The first end of the first shell is provided with a top wall, and the second end is provided with a bottom wall, the top wall is connected to the top of the first side wall and the second side wall, the bottom wall is connected to the bottom of the first side wall and the second side wall, and the bottom wall is connected to the direct cooling plate.

4. The heat-saturating baffle according to claim 3, wherein: The orthographic projection area of ​​the bottom wall on the direct cooling plate is greater than the orthographic projection area of ​​the top wall on the direct cooling plate.

5. The heat-saturating baffle according to claim 1, wherein: The end of the capillary element is wrapped by the cooling medium.

6. The heat-saturating baffle according to claim 5, wherein: The first side wall includes a first inner surface, and the second side wall includes a second inner surface; The capillary element further comprises a first capillary element and a second capillary element, wherein the first capillary element is arranged in contact with the first inner surface, and the second capillary element is arranged in contact with the second inner surface, the first capillary element is used for allowing the liquid cooling medium to diffuse on the first inner surface, and the second capillary element is used for allowing the liquid cooling medium to diffuse on the second inner surface.

7. The heat-saturating baffle according to claim 1, wherein: The first shell has an inner cavity with a first partition plate and a second partition plate arranged therein, the first side wall, the first partition plate, the second partition plate and the second side wall are arranged in parallel and spaced apart in sequence, the inner cavity of the first shell includes a first cavity, a second cavity and a third cavity arranged in sequence, the first side wall and the first partition plate are sealed to form the first cavity, the first partition plate and the second partition plate are enclosed to form the second cavity, and the second partition plate and the second side wall are sealed to form the third cavity; The cooling medium includes a uniform cooling medium and a direct cooling medium. The first cavity is provided with the uniform cooling medium and a first capillary element. The third cavity is provided with the uniform cooling medium and a second capillary element. The second cavity is provided with the direct cooling medium.

8. The heat-saturating baffle according to claim 7, wherein: The volume of the first cavity: the volume of the second cavity: the volume of the third cavity is 1:X:1, 1≤X≤2.

9. The heat-saturating baffle according to claim 7, wherein: The uniform cooling medium includes a liquid, and the uniform cooling medium is configured to circulate between a liquefied state and a gaseous state; and / or, the direct cooling medium includes a liquid or air, and the direct cooling medium is configured to flow into the interior of the second cavity and flow out to the outside of the second cavity.

10. The heat-saturating baffle according to claim 9, wherein: The heat equalizing baffle also includes a first inlet and a first outlet, the first inlet is used for allowing the equalizing cooling medium to enter the interior of the second cavity, and the first outlet is used for allowing the second cooling medium to flow out to the outside of the second cavity; wherein the first inlet is connected to the second inlet of the direct cooling plate.

11. The heat-saturating baffle according to claim 10, wherein: One of the first inlet and the first outlet is disposed on the first partition plate, and the other of the first inlet and the first outlet is disposed on the second partition plate.

12. A battery module, comprising: A heat-saturating baffle, wherein the heat-saturating baffle is the heat-saturating baffle according to any one of claims 1 to 11; A direct cooling plate, wherein the direct cooling plate is connected to one end of the heat-averaging baffle, and the direct cooling plate comprises a top cover and a base connected to each other, wherein the base and the top cover define a fluid channel, and a plurality of protrusions are arranged on the side of the top cover facing away from the heat-averaging baffle, and the protrusions are arranged in the fluid channel.

13. The battery module according to claim 12, wherein: The cross section of the protrusion includes a circle or a square.

14. A battery module, comprising: A heat-saturating baffle, wherein the heat-saturating baffle is the heat-saturating baffle according to any one of claims 1 to 11; A direct cooling plate, the direct cooling plate is connected to one end of the heat-saturating baffle, the direct cooling plate comprises a second shell, and the second shell is provided with a hollow accommodating cavity; A channel tube, the channel tube is arranged in the accommodating cavity, the inner cavity of the channel tube is defined as a fluid channel, and the fluid channel is used for the direct cooling medium to flow; A heat-conducting medium is used to fill a gap between the channel tube and the shell.

15. A direct cooling plate, the direct cooling plate being connected to one end of a heat soaking baffle, the heat soaking baffle being the heat soaking baffle according to any one of claims 1 to 11, the direct cooling plate comprising: A second shell, wherein the second shell is provided with a hollow accommodating cavity; A channel tube, the channel tube is arranged in the accommodating cavity, the inner cavity of the channel tube is defined as a fluid channel, and the fluid channel is used for the direct cooling medium to flow; A heat-conducting medium is used to fill a gap between the channel tube and the shell.

16. The direct cooling plate according to claim 15, wherein: The thermal conductivity of the heat-conducting medium is 1 W / (m·K) to 10 W / (m·K).

17. The direct cooling plate according to claim 15, wherein: The second shell includes a first side plate and a second side plate that are oppositely arranged, and the accommodating cavity is located between the first side plate and the second side plate; The first side plate includes a first surface and a second surface that are arranged opposite to each other, the first surface is connected to the partition of the battery module, and the second surface is close to the heat-conducting medium.

18. The direct cooling plate according to claim 17, wherein: A portion of the second surface is in contact with the heat-conducting medium, and / or another portion of the second surface is in contact with the outer wall of the channel tube.

19. The direct cooling plate according to any one of claims 15 to 18, wherein: The total volume of the channel tube is greater than the total volume of the gap between the channel tube and the shell.

20. The direct cooling plate according to any one of claims 15 to 18, wherein: The cross section of the channel tube includes a plurality of discs, and adjacent discs are connected; Alternatively, the channel tube extends in an S-shaped spiral; Alternatively, the channel tubes are distributed in a dendrite-like manner.

21. A battery module, comprising: A battery pack, comprising a plurality of batteries arranged along a first direction; A heat spreader assembly, comprising a heat spreader baffle arranged between adjacent batteries, the heat spreader baffle comprising the heat spreader according to claim 1, the capillary element of the heat spreader baffle comprising a primary capillary structure and a secondary capillary structure, the primary capillary structure and the secondary capillary structure are arranged in a first cavity of the heat spreader baffle at intervals, and the cross-sectional area of ​​the primary capillary structure is greater than the cross-sectional area of ​​the secondary capillary structure.

22. The battery module according to claim 21, characterized in that: The battery has a first and a second relative surface, and a first and a second relative side surface, and a top and a bottom relative surface located between the first and the second surfaces. The surface areas of the first and the second surfaces are both larger than the surface areas of the first side surface, the second side surface, the top surface, and the bottom surface. The heat-dissipating baffle is arranged on the first and the second surfaces.

23. The battery module according to claim 22, wherein: In the direction from the bottom surface to the top surface, the heat-spreading baffle has a bottom and a top opposite to each other, the primary capillary structure extends linearly from the bottom to the top, and the secondary capillary structure extends curvedly from the bottom to the top.

24. The battery module according to claim 21, wherein: The heat spreader assembly also includes a plurality of groups of spaced-apart support assemblies, wherein the support assemblies are disposed in the first shell, and each group of support assemblies includes a plurality of support blocks arranged in an array, wherein the support blocks have two opposite ends in the first direction, and the two ends of the support blocks are respectively abutted against the first surface and the second surface.

25. The battery module according to claim 24, wherein: A first gap is provided between two adjacent groups of the support assemblies; In each group of the support components, a second gap is provided between adjacent support blocks, and a cross-sectional area of ​​the first gap is greater than a cross-sectional area of ​​the second gap; The primary capillary structure is disposed in the first gap, and the secondary capillary structure is disposed in the second gap.

26. The battery module according to claim 24, wherein: The first shell includes a first cover plate and a second cover plate, and the first cover plate and the second cover plate are butted together to form the first shell having a cavity; the first cover plate includes the first side wall and the second side wall, or the second cover plate includes the first side wall and the second side wall, or the first cover plate includes one of the first side wall and the second side wall, and the second cover plate includes the other of the first side wall and the second side wall; The support block is fixed on the first cover plate and / or the second cover plate, and the primary capillary structure and the secondary capillary structure are fixed on the first cover plate and / or the second cover plate.

27. The battery module according to claim 21, wherein: An anti-corrosion film layer is arranged on the inner wall of the first shell.

28. The battery module according to claim 27, wherein: A hydrophilic film layer is arranged on the surface of the anti-corrosion film layer facing the first cavity.

29. The battery module according to claim 21, wherein: Two heat-spreading baffles are arranged between adjacent batteries, and a buffer layer is arranged between two adjacent heat-spreading baffles.

30. The battery module according to any one of claims 22 to 29, wherein: The heat spreader assembly further includes a heat spreader bottom plate, and the heat spreader bottom plate is arranged on the bottom surface of the battery.

31. The battery module according to claim 30, wherein: A groove is provided on one side of the heat-spreading bottom plate facing the heat-spreading baffle, and one end of the heat-spreading baffle is inserted into the groove.

32. The battery module according to claim 30, wherein: The soaking plate has a second cavity, the first cavity is communicated with the second cavity, and a cooling medium is arranged in the second cavity.

33. The battery module according to claim 30, wherein: The heat-saturating baffle and the heat-saturating bottom plate are an integrated structure.

34. The battery module according to claim 30, wherein: The battery module further includes a heat exchange device, which is disposed on a side of the heat soaking bottom plate away from the heat soaking baffle, and includes a liquid cooling plate and / or heat dissipation fins.

35. A battery module, comprising: Base plate; A plurality of batteries, each of the batteries comprising a housing, the housing having a top surface and a bottom surface arranged opposite to each other, the bottom surface further being provided with a reinforcement structure, the reinforcement structure being used to be connected to the bottom plate, the surface area of ​​the reinforcement structure being larger than the orthographic projection area of ​​the reinforcement structure on the top surface; A heat-spreading partition, wherein the heat-spreading partition is disposed between any two of the batteries, and the heat-spreading partition is the heat-spreading partition according to any one of claims 1 to 11.

36. The battery module according to claim 35, wherein: The reinforcement structure includes a plurality of first protrusions.

37. The battery module according to claim 36, wherein: The plurality of first protrusions are configured to extend in a wave shape.

38. The battery module according to claim 37, wherein: The first protrusions include crests and troughs, and the height differences between the crests and troughs of the plurality of first protrusions are the same.

39. The battery module according to claim 36, wherein: The bottom surface comprises a first side edge and a second side edge connected to each other, the plurality of first protrusions extend along an extension direction of the first side edge, and a length of each first protrusion extending along the first side edge is equal to a length of the first side edge; Alternatively, the plurality of first protrusions extend along an extension direction of the second side, and a length of each first protrusion extending along the second side is equal to a length of the second side.

40. The battery module according to claim 36, wherein: The cross-section of the first protrusion is set to be a rectangle, and the first protrusion includes a first type of protrusion and a second type of protrusion that are arranged in sequence at intervals, the orthographic projection of the first type of protrusion on the first side and the orthographic projection of the second type of protrusion on the first side are staggered with each other, and the sum of the length of the first type of protrusion extending along the first side and the length of the second type of protrusion extending along the first side is equal to the length of the first side.

41. The battery module according to claim 35, wherein: The reinforcement structure includes a plurality of first grooves.

42. The battery module according to claim 41, wherein: The bottom surface comprises a first side edge and a second side edge connected to each other, the plurality of first grooves extend along an extension direction of the first side edge, and a length of the first grooves extending along the first side edge is equal to a length of the first side edge; Alternatively, the plurality of first grooves extend along an extension direction of the second side, and a length of the first grooves extending along the second side is equal to a length of the second side.

43. The battery module according to any one of claims 35 to 42, wherein: The bottom surface of the battery is bonded to the bottom plate by heat-conducting adhesive.

44. The battery module according to claim 43, wherein: A plurality of second protrusions are provided on the bottom plate, and the second protrusions are fixedly matched with the reinforcement structure; or a plurality of second grooves are provided on the bottom plate, and the second grooves are fixedly matched with the reinforcement structure.

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