Liquid cooling plate, battery pack and charging and discharging device

Abstract

The utility model provides a liquid cooling plate, a battery pack and a charging and discharging device, and belongs to the field of batteries. The liquid cooling plate comprises a first plate body and a second plate body, a plurality of cooling runners are arranged in the first plate body, the second plate body is located on one face of the first plate body and connected with the first plate body, and a cavity used for containing a heat-conducting medium is formed in the second plate body. In the working process of the liquid cooling plate, heat generated in the high-temperature area of the first plate body is conducted to the second plate body, and the heat can be conducted to the low-temperature area of the first plate body under the action of the heat-conducting medium in the second plate body, so that the temperature difference of different areas of the first plate body is reduced, the temperature of the first plate body is more uniform, and the working efficiency of the liquid cooling plate is improved. The temperature difference between different battery cells in the working process of the battery pack is reduced, and the service life of the battery cells is prolonged.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a liquid cooling plate, a battery pack, and a charging and discharging device. Background Art

[0002] A battery pack generally includes battery cells and a liquid cooling plate. Multiple battery cells are arranged on one side of the liquid cooling plate. When the battery pack is in operation, the liquid cooling plate cools down the multiple battery cells.

[0003] The liquid cooling plate has a circuitous cooling channel inside, and the surface of the liquid cooling plate is connected with a liquid inlet joint and a liquid outlet joint, which are connected to the cooling channel. When the liquid cooling plate dissipates heat from the battery cell, the coolant enters the liquid cooling plate from the liquid inlet joint, flows along the cooling channel to the liquid outlet joint, and then flows out from the liquid outlet joint. The heat generated during the operation of the battery cell is transferred to the liquid cooling plate, and the coolant takes away the heat as it flows through the cooling channel, thereby playing a role in cooling.

[0004] As the coolant flows in the cooling channel, it continuously absorbs heat and its temperature gradually rises, which makes the temperature of the liquid cooling plate uneven. The temperature near the liquid inlet joint is low, and the temperature near the liquid outlet joint is high. Uneven temperature of the liquid cooling plate will cause temperature differences between cells at different positions in the battery pack, thus affecting the service life of the cells. Utility Model Content

[0005] The embodiment of the present application provides a liquid cooling plate, a battery pack and a charging and discharging device, which can make the temperature of the liquid cooling plate more uniform, which is beneficial to prolonging the service life of the battery cell. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present application provides a liquid cooling plate, which includes a first plate body and a second plate body, wherein the first plate body has a plurality of cooling channels, the second plate body is located on one side of the first plate body and is connected to the first plate body, and the second plate body has a cavity for accommodating a heat-conducting medium.

[0007] Based on the above features, multiple cooling channels are provided in the first plate body, and during the operation of the liquid cooling plate, the cooling channels are used to pass cooling liquid to take away heat and cool the first plate body. By arranging the second plate body on one side of the first plate body, the second plate body has a cavity for accommodating a heat-conducting medium, and the second plate body can exchange heat with the first plate body. During the operation of the liquid cooling plate, the heat generated in the area with a higher temperature of the first plate body is conducted to the second plate body, and the heat can be conducted to the area with a lower temperature of the first plate body under the action of the heat-conducting medium in the second plate body, thereby reducing the temperature difference between different areas of the first plate body, making the temperature of the first plate body more uniform, which is beneficial to reducing the temperature difference between different cells during the operation of the battery pack, and is beneficial to extending the service life of the cells.

[0008] In some examples, the multiple cooling channels are arranged coplanarly, and the cavity is parallel to the multiple cooling channels near the inner surface of the first plate body.

[0009] Based on the above features, by arranging the multiple cooling channels coplanarly and making the cavity parallel to the multiple cooling channels near the inner surface of the first plate body, the vertical distance from the multiple cooling channels to the cavity can be made equal. This enables the heat conduction distance to be the same when different cooling channels exchange heat with the heat-conducting medium in the second plate body, which further facilitates the uniform distribution of heat.

[0010] In some examples, the orthographic projection of the cooling channel on the first surface is located within the orthographic projection of the cavity on the first surface, and the first surface is the surface of the first plate body close to the second plate body.

[0011] Based on the above features, it can prompt the coolant in the entire cooling channel to conduct heat to the first plate body, which is beneficial to accelerating the heat exchange between the second plate body and the first plate body and avoiding temperature differences at different positions in the same cooling channel.

[0012] In some examples, the second plate body includes a first side plate and a second side plate arranged oppositely, and the first side plate and the second side plate are connected to form the cavity, and the first side plate and the first plate body are of an integral structure.

[0013] Based on the above features, by setting the first side plate and the first plate body as an integral structure, there is no gap between the first side plate and the first plate body. This structure is beneficial to the heat exchange between the first plate body and the heat-conducting medium in the second plate body, and is also beneficial to reducing the temperature difference in different regions of the liquid cooling plate.

[0014] In some examples, the liquid cooling plate further includes a first reinforcing rod and a second reinforcing rod. The first reinforcing rod and the second reinforcing rod are located on one side of the first plate body and are connected to the first plate body. The second plate body is located between the first reinforcing rod and the second reinforcing rod. One side of the first side plate and one side of the second side plate are respectively connected to the first reinforcing rod, and the other side of the first side plate and the other side of the second side plate are respectively connected to the second reinforcing rod.

[0015] Based on the above features, by setting the first reinforcing rod and the second reinforcing rod, the structural strength of the first plate body and the second plate body can be enhanced to avoid deformation or even damage of the first plate body and the second plate body under external forces. By using the first reinforcing rod and the second reinforcing rod to enclose the cavity, the cavity is open before the first reinforcing rod and the second reinforcing rod are installed in place. Therefore, there is no need to additionally provide holes in the second plate body to inject the heat-conducting medium, which saves the process and makes the structural integrity of the second plate body higher and the strength greater.

[0016] In some examples, the liquid cooling plate further includes a third reinforcing bar, one end of the third reinforcing bar is connected to the first reinforcing bar, the other end is connected to the second reinforcing bar, and the edges of the first plate body and the second plate body are respectively connected to the third reinforcing bar.

[0017] Based on the above features, the third reinforcing bar protects the edges of the first plate body and the second plate body, and can also improve the structural strength of the first plate body and the second plate body.

[0018] In some examples, one side of the first reinforcing bar close to the first plate body has a first avoidance groove and a second avoidance groove;

[0019] The liquid cooling plate further includes a first joint and a second joint. The first joint and the second joint are respectively connected to the first plate body and are respectively communicated with the cooling flow channel. At least a part of the first joint is located in the first avoidance groove, and at least a part of the second joint is located in the second avoidance groove.

[0020] Based on the above features, by providing the first avoidance groove and the second avoidance groove to accommodate the first joint and the second joint, protection can be provided for the first joint and the second joint, avoiding damage to the connection between the first joint and the second joint and the first plate body due to bumping, resulting in leakage of the coolant.

[0021] In some examples, the second plate body is a heat spreader.

[0022] Based on the above features, by providing the heat spreader, heat exchange between different regions of the first plate body can be promoted, and the temperature difference between different regions of the first plate body can be reduced.

[0023] In a second aspect, an embodiment of the present application further provides a battery pack, and the battery pack includes a battery cell and the liquid cooling plate as described in the first aspect.

[0024] In a third aspect, an embodiment of the present application further provides a charging and discharging device, and the charging and discharging device includes at least one battery pack as described in the second aspect.

[0025] The beneficial effects brought by the technical solution provided by the embodiment of the present application at least include:

[0026] By setting a plurality of cooling channels in the first plate body, the cooling channels are used to pass cooling liquid during the operation of the liquid cooling plate to take away the heat and cool the first plate body. By arranging the second plate body on one side of the first plate body, the second plate body has a cavity for accommodating a heat-conducting medium, and the second plate body can exchange heat with the first plate body. During the operation of the liquid cooling plate, the heat generated in the area with a higher temperature of the first plate body is transferred to the second plate body, and the heat can be transferred to the area with a lower temperature of the first plate body under the action of the heat-conducting medium in the second plate body, thereby reducing the temperature difference between different areas of the first plate body, making the temperature of the first plate body more uniform, which is beneficial to reducing the temperature difference between different cells during the operation of the battery pack and is beneficial to extending the service life of the cells.

[0027] It can be understood that the beneficial effects of the second and third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a structural schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0030] Figure 2 yes Figure 1 Ⅰ-Ⅰ cross-section diagram;

[0031] Figure 3 is a structural schematic diagram of a first plate body provided in an embodiment of the present application;

[0032] Figure 4 yes Figure 1 Ⅱ-Ⅱ cross section diagram in;

[0033] Figure 5 It is a partial exploded schematic diagram of a liquid cooling plate provided in an embodiment of the present application;

[0034] Figure 6 It is a partial exploded schematic diagram of a liquid cooling plate provided in an embodiment of the present application.

[0035] Figure Number:

[0036] First plate body: 11; Second plate body: 12; Cooling channel: 11a; Cavity: 12a; First cavity: 11b; Second cavity: 11c; Third cavity: 11d; First joint: 21; Second joint: 22; First side plate: 121; Second side plate: 122; First reinforcing rod: 31; Second reinforcing rod: 32; Third reinforcing rod: 33; Connecting pipe: 211; Connecting block: 212; First avoiding groove: 31a; Second avoiding groove: 31b; First retaining edge: 311; Second retaining edge: 321. Detailed implementation manners

[0037] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are presented in order to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0038] It should also be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0040] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0041] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0042] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Multiple" means two or more.

[0043] Figure 1 It is a structural schematic diagram of a liquid cooling plate provided in an embodiment of the present application. Figure 2 yes Figure 1 The Ⅰ-Ⅰ cross-section diagram is as follows: Figure 2 As shown, the battery includes a first plate body 11 and a second plate body 12 .

[0044] The first plate 11 has a plurality of cooling channels 11a, and the second plate 12 is located on one side of the first plate 11. The second plate 12 is connected to the first plate 11, and has a cavity 12a for accommodating a heat-conducting medium.

[0045] By providing a plurality of cooling channels 11 a in the first plate body 11 , the cooling channels 11 a are used to pass cooling liquid during the operation of the liquid cooling plate to take away heat and cool the first plate body 11 .

[0046] The second plate body 12 is arranged on one side of the first plate body 11 , and the second plate body 12 has a cavity 12 a for accommodating a heat-conducting medium therein, so that the second plate body 12 can perform heat exchange with the first plate body 11 .

[0047] During the operation of the liquid cooling plate, the heat generated in the higher temperature area of the first plate body 11 is conducted to the second plate body 12. Under the action of the heat-conducting medium in the second plate body 12, the heat can be conducted to the lower temperature area of the first plate body 11, thereby reducing the temperature difference between different areas of the first plate body 11 and making the temperature of the first plate body 11 more uniform, which is beneficial to reducing the temperature difference between different battery cells during the operation of the battery pack and is beneficial to extending the service life of the battery cells.

[0048] Figure 3 : is a schematic diagram of the structure of a first plate body provided in an embodiment of the present application, in order to show the internal structure of the first plate body, Figure 3 Part of the structure of the first plate 11 is omitted. Figure 3As shown in the figure, the first plate body 11 further has a first cavity 11b, a second cavity 11c, and a third cavity 11d. The first cavity 11b and the second cavity 11c are located at the same end of the plurality of cooling channels 11a, and the first cavity 11b and the second cavity 11c are arranged along the arrangement direction of the plurality of cooling channels 11a. Among the plurality of cooling channels 11a, the cooling channels 11a close to the first cavity 11b are communicated with the first cavity 11b, and the cooling channels 11a close to the second cavity 11c are communicated with the second cavity 11c. The third cavity 11d is located at the other end of the plurality of cooling channels 11a, and the third cavity 11d is communicated with each cooling channel 11a.

[0049] By setting the first cavity 11b to be connected to a part of the cooling channels 11a, the first cavity 11b plays a role in shunting, so that the coolant entering the first cavity 11b is quickly shunted into a part of the cooling channels 11a, and the temperature difference of the coolant in different cooling channels 11a connected to the first cavity 11b is small. Similarly, a part of the third cavity 11d plays a role in confluence, and another part plays a role in shunting, quickly shunting the coolant into another part of the cooling channels 11a, and then converging into the second cavity 11c, so that the temperature difference of the coolant in different cooling channels 11a connected to the second cavity 11c is small.

[0050] Exemplarily, the first cavity 11b, the second cavity 11c, and the third cavity 11d are all strip-shaped and extend along the arrangement direction of the plurality of cooling channels 11a. The strip-shaped cavity is beneficial to the rapid flow of the coolant. By setting the first cavity 11b, the second cavity 11c, and the third cavity 11d to be all strip-shaped, the resistance generated by the cavity to the coolant can be small, the coolant flow can be accelerated, and the cooling effect can be improved.

[0051] As shown in Figure 1 the figure, the liquid cooling plate further includes a first joint 21 and a second joint 22. Figure 4 It is Figure 1 the cross-sectional view of II-II in Figure 4 the figure. As shown in

[0052] By setting the first joint 21 and the second joint 22, it is convenient to connect the liquid cooling plate to the external coolant circulation pipeline.

[0053] As an example, the first joint 21 can be an inlet joint, and the second joint 22 can be an outlet joint. The first joint 21 and the second joint 22 are respectively connected to the first plate body 11. Among them, the first joint 21 is communicated with the first cavity 11b, and the second joint 22 is communicated with the second cavity 11c.

[0054] During the operation of the liquid cooling plate, coolant is injected into the first cavity 11b through the first joint 21. The coolant is split in the first cavity 11b and flows into a plurality of cooling channels 11a communicating with the first cavity 11b. After flowing through the cooling channels 11a, it enters the third cavity 11d, then enters a plurality of cooling channels 11a communicating with the second cavity 11c through the third cavity 11d, and finally converges in the second cavity 11c and flows out through the second joint 22.

[0055] As Figure 2 shown, in the first plate body 11, a plurality of cooling channels 11a are arranged coplanarly. In the second plate body 12, the cavity 12a is close to the inner surface of the first plate body 11 and is parallel to the plurality of cooling channels 11a.

[0056] In this example, the inner surface being parallel to the cooling channels 11a may mean that the inner surface is parallel to the extending direction of the cooling channels 11a.

[0057] By arranging a plurality of cooling channels 11a coplanarly, the distances from different cooling channels 11a to the surface of the first plate body 11 can be made the same, which is beneficial to reducing the temperature difference in different regions on the surface of the first plate body 11.

[0058] The inner surface of the cavity 12a close to the first plate body 11 is one of the two largest inner surfaces of the cavity 12a. As an example, the cavity 12a can be cuboid-shaped, and the length and width of the cavity 12a can be much larger than the thickness of the cavity 12a. For example, both the length and width of the cavity 12a can be not less than ten times the thickness. By setting the thickness relatively thin, it is beneficial to reduce the thickness of the liquid cooling plate and thus reduce the weight of the liquid cooling plate.

[0059] By arranging a plurality of cooling channels 11a coplanarly and making the inner surface of the cavity 12a close to the first plate body 11 parallel to the plurality of cooling channels 11a, the perpendicular distances from the plurality of cooling channels 11a to the cavity 12a can be made equal. This makes the heat conduction distances the same when different cooling channels 11a exchange heat with the heat-conducting medium in the second plate body 12, which is further beneficial to the uniform distribution of heat.

[0060] As Figure 4 shown, the orthographic projection of the cooling channels 11a on the first surface is located within the orthographic projection of the cavity 12a on the first surface, that is, neither end of the cooling channels 11a extends beyond the edge of the cavity 12a. Among them, the first surface is the surface of the first plate body 11 close to the second plate body 12. The second surface of the first plate body 11 is used for heat exchange with the battery cell. The second surface of the first plate body 11 is the side opposite to the first surface.

[0061] By making the orthographic projection of the cooling channel 11a on the first surface lie within the orthographic projection of the cavity 12a on the first surface, that is to say, the coolant within the entire cooling channel 11a can conduct heat exchange with the heat-conducting medium in the cavity 12a. This can prompt the coolant within the entire cooling channel 11a to conduct heat to the first plate body 11, which is conducive to accelerating the heat exchange between the second plate body 12 and the first plate body 11 and avoiding temperature differences at different positions within the same cooling channel 11a.

[0062] The orthographic projections of the first cavity 11b, the second cavity 11c, and the third cavity 11d in the first plate body 11 on the first surface can all have parts that lie within the orthographic projection of the cavity 12a on the first surface. There is also a temperature difference between the coolant in the first cavity 11b and the coolant in the second cavity 11c, and there is also a temperature difference between the coolant at both ends of the third cavity 11d. Through this setting, the coolant in the first cavity 11b and the coolant in the second cavity 11c can conduct heat exchange through the heat-conducting medium in the cavity 12a, and the coolant at both ends of the third cavity 11d can also conduct heat exchange through the heat-conducting medium in the cavity 12a, which is conducive to further improving the temperature uniformity of the liquid cooling plate.

[0063] Figure 5 is a partial exploded view of a liquid cooling plate provided by an embodiment of the present application, as Figure 5 shown, the second plate body 12 includes a first side plate 121 and a second side plate 122 arranged oppositely, and the first side plate 121 and the second side plate 122 are connected to form a cavity 12a. Among them, the first side plate 121 and the first plate body 11 are of an integral structure.

[0064] In some examples, the fact that the first side plate 121 and the first plate body 11 are of an integral structure means that the first side plate 121 and the first plate body 11 are a whole.

[0065] By setting the first side plate 121 and the first plate body 11 as an integral structure, there is no gap between the first side plate 121 and the first plate body 11. This structure is conducive to the heat exchange between the first plate body 11 and the heat-conducting medium in the second plate body 12, and is also conducive to reducing the temperature difference in different regions of the liquid cooling plate.

[0066] In some other examples, the fact that the first side plate 121 and the first plate body 11 are of an integral structure can also mean that the first side plate 121 and the first plate body 11 are the same plate body.

[0067] By setting the first side plate 121 and the first plate body 11 as the same plate body, in addition to being conducive to the heat exchange between the first plate body 11 and the heat-conducting medium in the second plate body 12 and being conducive to reducing the temperature difference in different regions of the liquid cooling plate, it can also reduce the use of materials and lower the manufacturing cost.

[0068] As an example, the edges of the first side plate 121 and the second side plate 122 can be welded. By connecting the first side plate 121 and the second side plate 122 in a welding manner, not only can the sealing performance be improved, but also the processing is convenient and the production cost is low.

[0069] As Figure 1 shown, the liquid cooling plate further includes a first reinforcing bar 31 and a second reinforcing bar 32. The first reinforcing bar 31 and the second reinforcing bar 32 are located on one side of the first plate body 11 and are connected to the first plate body 11. By providing the first reinforcing bar 31 and the second reinforcing bar 32, the structural strength of the first plate body 11 is enhanced to prevent the first plate body 11 from deforming or even being damaged under external forces.

[0070] The second plate body 12 is located between the first reinforcing bar 31 and the second reinforcing bar 32. As Figure 5 shown, one side of the first side plate 121 and one side of the second side plate 122 are respectively connected to the first reinforcing bar 31. Figure 6 is a partial exploded view of a liquid cooling plate provided by an embodiment of the present application. As Figure 6 shown, the other side of the first side plate 121 and the other side of the second side plate 122 are respectively connected to the second reinforcing bar 32. By providing the first reinforcing bar 31 and the second reinforcing bar 32, the structural strength of the second plate body 12 is enhanced to prevent the second plate body 12 from deforming or even being damaged under external forces.

[0071] The first reinforcing bar 31 and the second reinforcing bar 32 are arranged on the first surface of the first plate body 11. Exemplarily, the first reinforcing bar 31 and the second reinforcing bar 32 can be welded to the first plate body 11.

[0072] In this example, the side plate of the first side plate 121 close to the first reinforcing bar 31 and the side edge of the second side plate 122 close to the first reinforcing bar 31 are not directly connected, but are respectively connected to the first reinforcing bar 31. The side plate of the first side plate 121 close to the second reinforcing bar 32 and the side edge of the second side plate 122 close to the second reinforcing bar 32 are also not directly connected, but are respectively connected to the second reinforcing bar 32. A cavity 12a is formed by the first side plate 121, the second side plate 122, the first reinforcing bar 31 and the second reinforcing bar 32. Exemplarily, the first side plate 121 and the second side plate 122 can be welded to the first reinforcing bar 31, and the first side plate 121 and the second side plate 122 can be welded to the second reinforcing bar 32.

[0073] The cavity 12a of the first plate body 11 is used to accommodate the heat-conducting medium. Before the liquid cooling plate is put into use, it is necessary to inject the heat-conducting medium into the cavity 12a. Before the first reinforcing rod 31 and the second reinforcing rod 32 are installed in place, the cavity 12a is open. After one of the first reinforcing rod 31 and the second reinforcing rod 32 is installed in place, for example, after the first reinforcing rod 31 is installed in place, the heat-conducting medium can be injected between the first side plate 121 and the second side plate 122, and then the second reinforcing rod 32 is installed. Since the cavity 12a is open before the first reinforcing rod 31 and the second reinforcing rod 32 are installed in place, that is, the cavity 12a is closed by using the first reinforcing rod 31 and the second reinforcing rod 32, there is no need to additionally provide holes in the second plate body 12 to inject the heat-conducting medium, which saves the process and makes the structural integrity of the second plate body 12 higher and the strength greater.

[0074] Exemplarily, the heat-conducting medium can be a liquid heat-conducting medium with fluidity. In some examples, the heat-conducting medium can be a liquid metal or alloy. By using a medium with fluidity as the heat-conducting medium, the heat-conducting medium can perform heat convection in the cavity 12a, accelerating the heat transfer and being beneficial to improving the temperature uniformity of the liquid cooling plate.

[0075] In addition, since both the first plate body 11 and the second plate body 12 are hollow inside, the first reinforcing rod 31 and the second reinforcing rod 32 are also provided to improve the structural strength of the first plate body 11 and the second plate body 12.

[0076] Exemplarily, both the first reinforcing rod 31 and the second reinforcing rod 32 can be perpendicular to the cooling channel 11a.

[0077] As an example, both the first reinforcing rod 31 and the second reinforcing rod 32 can be square steel. One surface of the square steel is connected to the first plate body 11, and the other surface is connected to the second plate body 12. The square steel has strong bending resistance and is not easily deformed by bending.

[0078] As Figure 5 shown, the first reinforcing rod 31 has a first avoidance groove 31a and a second avoidance groove 31b on the side close to the first plate body 11. The first joint 21 is at least partially located in the first avoidance groove 31a, and the second joint 22 is at least partially located in the second avoidance groove 31b.

[0079] By providing the first avoidance groove 31a and the second avoidance groove 31b to accommodate the first joint 21 and the second joint 22, the first joint 21 and the second joint 22 can be protected, avoiding damage to the connection between the first joint 21 and the second joint 22 and the first plate body 11 caused by bumping and resulting in leakage of the coolant.

[0080] The structures of the first joint 21 and the second joint 22 can be the same. Taking the first joint 21 as an example, the first joint 21 may include a connecting pipe 211 and a connecting block 212. One end of the connecting pipe 211 is connected to the connecting block 212, and the connecting block 212 is connected to the first surface of the first plate body 11. The connecting block 212 is located in the first avoidance groove 31a, and the connecting pipe 211 extends out of the first avoidance groove 31a. By extending the connecting pipe 211 out of the first avoidance groove 31a, it is convenient to connect the connecting pipe 211 with an external coolant circulation pipeline.

[0081] As Figure 5 shown, the liquid cooling plate may further include a third reinforcing rod 33. One end of the third reinforcing rod 33 is connected to the first reinforcing rod 31, and the other end of the third reinforcing rod 33 is connected to the second reinforcing rod 32. The edges of the first plate body 11 and the second plate body 12 are respectively connected to the third reinforcing rod 33.

[0082] The third reinforcing rod 33 protects the edges of the first plate body 11 and the second plate body 12, and can also improve the structural strength of the first plate body 11 and the second plate body 12.

[0083] As an example, there may be two third reinforcing rods 33, and the first plate body 11 and the second plate body 12 are located between the two third reinforcing rods 33. By connecting the first reinforcing rod 31, the second reinforcing rod 32 and the two third reinforcing rods 33 to form a frame structure, the liquid cooling plate can have a relatively high structural strength, and prevent the first plate body 11 and the second plate body 12 from being deformed or even damaged under the influence of external forces.

[0084] Exemplarily, the first reinforcing rod 31 and the second reinforcing rod 32 may be welded to the third reinforcing rod 33. The first reinforcing rod 31, the second reinforcing rod 32 and the third reinforcing rod 33 may all be square steel.

[0085] As Figure 5 and Figure 6 shown, both ends of the third reinforcing rod 33 may extend beyond the edge of the first plate body 11. A first edge guard 311 may be further connected to the side of the first reinforcing rod 31 away from the second reinforcing rod 32, and the edge of the first edge guard 311 may be flush with the end face of one end of the third reinforcing rod 33. By providing the first edge guard 311, it can protect the edge on one side of the first plate body 11, and prevent the first plate body 11 from being deformed or even damaged due to being knocked.

[0086] A second edge guard 321 may be further connected to the side of the second reinforcing rod 32 away from the first reinforcing rod 31, and the edge of the second edge guard 321 may be flush with the end face of the other end of the third reinforcing rod 33. By providing the second edge guard 321, it can protect the edge on the other side of the first plate body 11, and prevent the first plate body 11 from being deformed or even damaged due to being knocked.

[0087] In some other possible implementations, the second plate 12 may also be a vapor chamber (VC). A vapor chamber has high thermal conductivity, and by providing a vapor chamber, heat exchange between different areas of the first plate 11 can be promoted, thereby reducing the temperature difference between different areas of the first plate 11.

[0088] An embodiment of the present application further provides a battery pack, which may include a battery cell and any of the aforementioned liquid cooling plates. The battery pack may be located on a side of the first plate body 11 away from the second plate body 12 .

[0089] By arranging a liquid cooling plate on one side of the battery cell in the battery pack, the first plate body 11 of the liquid cooling plate is close to the battery cell to dissipate heat from the battery cell. By arranging a plurality of cooling channels 11a in the first plate body 11, the cooling channels 11a are used to pass cooling liquid during the operation of the liquid cooling plate to take away heat, cool the first plate body 11, and thus cool the battery cell. By arranging a second plate body 12 on one side of the first plate body 11, the second plate body 12 has a cavity 12a for accommodating a heat-conducting medium, and the second plate body 12 can exchange heat with the first plate body 11. During the operation of the liquid cooling plate, the heat generated in the area with a higher temperature of the first plate body 11 is transferred to the second plate body 12, and the heat can be transferred to the area with a lower temperature of the first plate body 11 under the action of the heat-conducting medium in the second plate body 12, thereby reducing the temperature difference between different areas of the first plate body 11, making the temperature of the first plate body 11 more uniform, which is conducive to reducing the temperature difference between different batteries during the operation of the battery pack and extending the service life of the battery cell.

[0090] An embodiment of the present application also provides a charging and discharging device, which includes at least one of the aforementioned battery packs.

[0091] By providing a battery pack having a liquid cooling plate provided by an embodiment of the present application in a charging and discharging device, during the operation of the liquid cooling plate, the heat generated in the area of the first plate body 11 with a higher temperature is conducted to the second plate body 12, and under the action of the heat-conducting medium in the second plate body 12, the heat can be conducted to the area of the first plate body 11 with a lower temperature, thereby reducing the temperature difference between different areas of the first plate body 11 and making the temperature of the first plate body 11 more uniform, which is beneficial to reducing the temperature difference between different battery cells during the operation of the battery pack and is beneficial to extending the service life of the battery cells, thereby making the charging and discharging device have a longer service life.

[0092] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A liquid cooling plate, characterized in that, It includes a first plate body (11) and a second plate body (12). A plurality of cooling channels (11a) are provided in the first plate body (11). The second plate body (12) is located on one side of the first plate body (11) and is connected to the first plate body (11). A cavity (12a) for accommodating a heat-conducting medium is provided in the second plate body (12).

2. The liquid cooling plate according to claim 1, wherein The plurality of cooling channels (11a) are arranged coplanarly, and the cavity (12a) is parallel to the plurality of cooling channels (11a) near the inner surface of the first plate body (11).

3. The liquid cooling plate according to claim 1, wherein The orthographic projection of the cooling channel (11a) on the first surface is located within the orthographic projection of the cavity (12a) on the first surface. The first surface is the surface of the first plate body (11) close to the second plate body (12).

4. The liquid cooling plate according to any one of claims 1 to 3, characterized in that, The second plate body (12) includes a first side plate (121) and a second side plate (122) arranged oppositely. The first side plate (121) and the second side plate (122) are connected to form the cavity (12a). The first side plate (121) and the first plate body (11) are of an integral structure.

5. The liquid cooling plate according to claim 4, characterized in that, It further includes a first reinforcing bar (31) and a second reinforcing bar (32). The first reinforcing bar (31) and the second reinforcing bar (32) are located on one side of the first plate body (11) and are connected to the first plate body (11). The second plate body (12) is located between the first reinforcing bar (31) and the second reinforcing bar (32). One side of the first side plate (121) and one side of the second side plate (122) are respectively connected to the first reinforcing bar (31), and the other side of the first side plate (121) and the other side of the second side plate (122) are respectively connected to the second reinforcing bar (32).

6. The liquid cooling plate according to claim 5, characterized in that, It further includes a third reinforcing bar (33). One end of the third reinforcing bar (33) is connected to the first reinforcing bar (31), and the other end is connected to the second reinforcing bar (32). The edges of the first plate body (11) and the second plate body (12) are respectively connected to the third reinforcing bar (33).

7. The liquid cooling plate according to claim 5, wherein A first avoidance groove (31a) and a second avoidance groove (31b) are provided on the side of the first reinforcing bar (31) close to the first plate body (11). The liquid cooling plate further includes a first connector (21) and a second connector (22). The first connector (21) and the second connector (22) are respectively connected to the first plate body (11) and are respectively communicated with the cooling channels (11a). The first connector (21) is at least partially located in the first avoidance groove (31a), and the second connector (22) is at least partially located in the second avoidance groove (31b).

8. The liquid cooling plate according to claim 1, wherein, The second plate body (12) is a heat pipe.

9. A battery pack, characterized in that, It includes an electric core and the liquid cooling plate according to any one of claims 1 to 8.

10. A charge-discharge device, characterized in that, It includes at least one battery pack according to claim 9.

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