Liquid cooling plate and battery pack

Abstract

A liquid cooling plate and a battery pack relate to the technical field of battery thermal management. Comprising a liquid cooling plate body which is provided with a first liquid inlet / outlet, a second liquid inlet / outlet, a first main flow channel, a second main flow channel, a first branch flow channel and a second branch flow channel; and the reversing valve group comprises a valve body, a valve core, a valve core driving mechanism, a valve core resetting mechanism and a controller. The first sub-runners on the liquid cooling plate body dissipate heat of the battery cells in the middle area, the second sub-runners are arranged on the outer sides of the first sub-runners and dissipate heat of the battery cells in other areas, the runner length and the heat exchange area are increased through the runner structure, and the heat dissipation performance of the liquid cooling plate body is improved; the reversing valve group changes the flow direction of the cooling liquid in the liquid cooling plate body through switching of the valve core, so that the temperature difference of the battery cells in the battery pack can be effectively reduced, and the consistency of the performance of the battery cells in the battery pack is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal management, and in particular to a liquid cooling plate and a battery pack. Background Art

[0002] Cold plate liquid cooling is the mainstream thermal management solution for energy storage battery packs. The cold plate is typically installed at the bottom of the battery as a support base. During operation, low-temperature coolant flows into the cold plate's inlet, passes through the cold plate's flow channel, and after heat exchange with the battery, becomes high-temperature coolant, which then flows out of the cold plate's outlet. However, the temperature difference between the batteries near the inlet and outlet is significant. This temperature difference accelerates battery aging near the outlet, and due to the "barrel effect," further accelerates the decline in the available capacity of the entire battery pack.

[0003] Current liquid cooling plates often utilize complex flow channel designs to control the coolant flow rate and pressure, thereby improving the temperature difference between cells within a battery pack. However, these complex liquid cooling plates are expensive to manufacture, and in actual use, the temperature difference between cells remains large. Therefore, effectively reducing the temperature difference between cells within a battery pack is a pressing issue for the energy storage industry. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a liquid cooling plate and a battery pack to solve at least one of the above technical problems.

[0005] In a first aspect, the present application provides a liquid cooling plate, comprising: a liquid cooling plate body, the liquid cooling plate body being provided with a first liquid inlet and outlet, a second liquid inlet and outlet, a first main channel, a second main channel, a first branch channel, and a second branch channel, the first liquid inlet and outlet being connected to the first main channel, the second liquid inlet and outlet being connected to the second main channel, the first main channel and the second main channel extending oppositely along a first direction, the first branch channel being a return channel extending in a straight line along the second direction, the first direction being perpendicular to the first direction, the first branch channel being arranged in the middle of the liquid cooling plate body in the first direction and having two ends connected to the first main channel and the second main channel, respectively The main channel is connected, the second branch channel is arranged on the outside of the first branch channel and its two ends are respectively connected to the first main channel and the second main channel; and a reversing valve group, the reversing valve group includes a valve body, a valve core, a valve core driving mechanism, a valve core reset mechanism, and a controller, one end of the valve body is connected to the first inlet and outlet and the second inlet and outlet, and the other end of the valve body is used to connect to the liquid cooling unit, the valve core driving mechanism is used to drive the valve core to switch, the valve core reset mechanism is used to drive the valve core to reset, and the controller is used to control the valve core driving mechanism and the valve core reset mechanism to change the flow direction of the coolant delivered by the liquid cooling unit in the liquid cooling plate body.

[0006] In combination with the first aspect, in some optional embodiments, the liquid cooling plate body is rectangular, having two side edges arranged along a first direction and another two side edges arranged along a second direction, and the first liquid inlet and outlet and the second liquid inlet and outlet are arranged in the middle of a side edge of the liquid cooling plate body arranged along the first direction.

[0007] In combination with the first aspect, in some optional embodiments, one end of the first main channel and one end of the second main channel are respectively connected to the first inlet and outlet and the second inlet and outlet, the first main channel near the middle and the second main channel near the middle are respectively connected to the two ends of the first branch channel, and the other end of the first main channel and the other end of the second main channel are respectively connected to the two ends of the second branch channel.

[0008] In combination with the first aspect, in some optional embodiments, the second diverter channel includes a second diverter channel main body and a plurality of second diverter channel branches, the second diverter channel main body is a return channel extending in a straight line along the second direction, the second diverter channel main body is arranged on the outside of the first diverter channel and its two ends are respectively connected to the first main channel and the second main channel, and the plurality of second diverter channel branches are distributed on the second diverter channel main body.

[0009] In combination with the first aspect, in some optional embodiments, the valve body is provided with a first docking port, a second docking port, a valve group liquid inlet, and a valve group liquid outlet, the first docking port and the second docking port are connected to the first liquid inlet and outlet and the second liquid inlet and outlet respectively, and the valve group liquid inlet and the valve group liquid outlet are used to connect to the liquid cooling unit.

[0010] In combination with the first aspect, in some optional embodiments, the valve core includes a straight-through valve core and a reversing valve core, the straight-through valve core has a first valve core channel and a second valve core channel, the first valve core channel is used to connect the first docking port and the valve group liquid inlet, the second valve core channel is used to connect the second docking port and the valve group liquid outlet, the reversing valve core has a third valve core channel and a fourth valve core channel, the third valve core channel is used to connect the second docking port and the valve group liquid inlet, and the fourth valve core channel is used to connect the first docking port and the valve group liquid outlet.

[0011] In combination with the first aspect, in some optional embodiments, the first valve core channel, the second valve core channel, the third valve core channel, and the fourth valve core channel are all made of metal conduits and are wrapped with heat insulation materials on the outside.

[0012] In combination with the first aspect, in some optional implementations, the valve core driving mechanism is an electric push rod, and the valve core reset mechanism is a spring.

[0013] In combination with the first aspect, in some optional embodiments, the controller includes a drive module, a valve group status acquisition module, a communication module, a storage module, a power module, and a main control module. The drive module is used to control the valve core drive mechanism and the valve core reset mechanism according to the signal of the main control module. The valve group status acquisition module is used to collect the feedback signal when the valve core is switched into position and transmit it to the main control module. The communication module is used to communicate with the BMS battery management system to obtain battery cell temperature data. The storage module is used to store battery cell temperature data. The power module is used to provide power support. The main control module is used to process battery cell temperature data and control the drive module when the battery cell temperature difference reaches a set value.

[0014] In the second aspect, the present application provides a battery pack, comprising a liquid cooling plate in any one embodiment of the first aspect, a plurality of battery cells, and a BMS battery management system. The liquid cooling plate is in contact with the plurality of battery cells for cooling and dissipating heat. The BMS battery management system is communicatively connected with a controller of a reversing valve group of the liquid cooling plate and the plurality of battery cells for detecting the temperature of the plurality of battery cells and transmitting the temperature to the controller.

[0015] Based on the above technical solution, the liquid cooling plate and battery pack provided by the present application, the liquid cooling plate includes a liquid cooling plate body and a reversing valve group. Among them, a first shunt channel of a folding type is used on the liquid cooling plate body to dissipate heat to the battery cells in the middle area, and a second shunt channel arranged outside the first shunt channel is used to dissipate heat to the battery cells in other areas. This flow channel structure increases the flow channel length and heat exchange area, thereby improving the heat dissipation performance of the liquid cooling plate body. The reversing valve group changes the flow direction of the coolant in the liquid cooling plate body by switching the valve core, so that the low-temperature coolant cools the battery cells through which the high-temperature coolant that originally absorbs the heat of the battery cells flows, and the high-temperature coolant that absorbs the heat of the battery cells cools the battery cells through which the low-temperature coolant originally flows. This is equivalent to increasing the cooling effect on the high-temperature battery cells and reducing the cooling effect on the low-temperature battery cells, thereby effectively reducing the temperature difference of the battery cells in the battery pack and ensuring the consistency of the performance of the battery cells in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of a liquid cooling plate provided in an embodiment of the present application.

[0018] Figure 2 A schematic diagram of the structure of a controller provided in an embodiment of the present application.

[0019] Figure 3 A schematic structural diagram of a liquid cooling plate for a battery pack provided in an embodiment of the present application.

[0020] Figure 4 Another structural schematic diagram of a liquid cooling plate for a battery pack provided in an embodiment of the present application.

[0021] Figure numerals: 100, liquid cooling plate; 10, liquid cooling plate body; 11, first liquid inlet and outlet; 12, second liquid inlet and outlet; 13, first main channel; 14, second main channel; 15, first branch channel; 16, second branch channel; 161, second branch channel main body; 162, second branch channel branch; 20, reversing valve group; 21, valve body; 211, first docking port; 212, second docking port; 213, valve group liquid inlet; 214, valve group liquid outlet; 22, straight-through valve core; 221, first valve core channel; 222, second valve core channel; 23, reversing valve core; 231, third valve core channel; 232, fourth valve core channel; 24, valve core drive mechanism; 25, valve core reset mechanism; 26, controller; 200, BMS battery management system. DETAILED DESCRIPTION

[0022] Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only a portion of the embodiments of the present application, and not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the description of this application without inventive effort are intended to fall within the scope of protection of this application.

[0023] In the description of this application, unless otherwise specified or limited, the terms "connect," "dispose," and "install" should be understood broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can mean that two components are internally connected. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] The terms "upper", "lower", "left", "right", "front", "back", "center", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the application is usually placed when used. They are only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present application.

[0025] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order, unless expressly specified and limited otherwise.

[0026] The terms "comprises," "includes," "has," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus. In the absence of more limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0027] The term "plurality" means two or more (including two).

[0028] The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0029] The terms "one embodiment," "as an example," "in one implementation," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example may be included in at least one embodiment or example of the present application. The schematic representations of such terms do not necessarily refer to the same embodiment, nor are they mutually exclusive independent or alternative embodiments. The embodiments and features within the embodiments of the present application may be combined in appropriate ways unless there is a conflict.

[0030] Figure 1 A schematic diagram of the structure of a liquid cooling plate 100 provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, an embodiment of the present application provides a liquid cooling plate 100 , including a liquid cooling plate body 10 and a reversing valve assembly 20 .

[0031] The liquid cooling plate body 10 is rectangular, with two sides extending along a first direction and two sides extending along a second direction, wherein the first and second directions are perpendicular. The liquid cooling plate body 10 is provided with a first liquid inlet and outlet 11, a second liquid inlet and outlet 12, a first main flow channel 13, a second main flow channel 14, a first branch flow channel 15, and a second branch flow channel 16.

[0032] The first liquid inlet and outlet 11 and the second liquid inlet and outlet 12 are arranged in the middle of a side edge arranged along the first direction of the liquid cooling plate body 10. When either one of the first liquid inlet and outlet 11 and the second liquid inlet and outlet 12 serves as the inlet of the cooling liquid, the other serves as the outlet.

[0033] One end of the first main channel 13 is connected to the first liquid inlet and outlet 11 , one end of the second main channel 14 is connected to the second liquid inlet and outlet 12 , and the other end of the first main channel 13 and the other end of the second main channel 14 extend opposite to each other along the first direction.

[0034] The first branch channel 15 is located in the middle of the liquid cooling plate body 10 in the first direction. Its two ends connect to the middle of the first main channel 13 and the middle of the second main channel 14, respectively. The first branch channel 15 is a zigzag channel that extends linearly in the second direction. As an example, the first branch channel 15 extends linearly in the second direction and zigzags five times, forming a V-shaped structure.

[0035] The second flow channel 16 includes a second flow channel main body 161 and a plurality of second flow channel branches 162. The two ends of the second flow channel main body 161 are connected to the other end of the first main flow channel 13 and the other end of the second main flow channel 14, respectively. The second flow channel main body 161 is a fold-back flow channel extending linearly along the second direction and is arranged outside the first flow channel 15. The middle portion of the second flow channel main body 161 in the first direction is also connected to the middle portion of the first flow channel 15 in the first direction. The plurality of second flow channel branches 162 are distributed on the second flow channel main body 161 to fill the area on the liquid cooling plate body 10 that is not passed by the second flow channel main body 161.

[0036] As an example, the second diverter channel main body 161 extends straight along the second direction and turns back five times, forming a mountain shape, wherein the third turning part is arranged on the outside of the first diverter channel 15; there are three second diverter channel branches 162, which are respectively arranged on the second, third and fourth turning parts of the second diverter channel main body 161.

[0037] One end of the reversing valve assembly 20 is connected to the first and second liquid inlet and outlet ports 11 and 12 of the liquid cooling plate body 10. The other end of the reversing valve assembly 20 is connected to the liquid cooling unit. The reversing valve assembly 20 is used to change the flow direction of the coolant delivered by the liquid cooling unit within the liquid cooling plate body 10. Specifically, the reversing valve assembly 20 includes a valve body 21, a valve core, a valve core drive mechanism 24, a valve core reset mechanism 25, and a controller 26.

[0038] The valve body 21 is provided with a first docking port 211, a second docking port 212, a valve block liquid inlet 213, and a valve block liquid outlet 214. The first docking port 211 is connected to the first liquid inlet and outlet 11 of the liquid cooling plate body 10, the second docking port 212 is connected to the second liquid inlet and outlet 12 of the liquid cooling plate body 10, the valve block liquid inlet 213 is used to connect to the liquid outlet of the liquid cooling unit, and the valve block liquid outlet 214 is used to connect to the liquid inlet of the liquid cooling unit.

[0039] The valve core is disposed within the valve body 21 and includes a through valve core 22 and a reversing valve core 23. The through valve core 22 has a first valve core channel 221 and a second valve core channel 222. The first valve core channel 221 is used to connect the first docking port 211 with the valve block liquid inlet 213, and the second valve core channel 222 is used to connect the second docking port 212 with the valve block liquid outlet 214. The reversing valve core 23 has a third valve core channel 231 and a fourth valve core channel 232. The third valve core channel 231 is used to connect the second docking port 212 with the valve block liquid inlet 213, and the fourth valve core channel 232 is used to connect the first docking port 211 with the valve block liquid outlet 214. The valve core channels of the through valve core 22 and the reversing valve core 23 are made of metal conduits and are coated with thermal insulation material. The thermal insulation material is used to reduce the impact of the valve core channel containing high-temperature coolant on the valve core channel containing low-temperature coolant.

[0040] The valve core drive mechanism 24 is disposed within the valve body 21, on one side of the valve core, and is used to drive the valve core to switch positions. The valve core reset mechanism 25 is disposed within the valve body 21, on the other side of the valve core, and is used to reset the valve core. For example, the valve core drive mechanism 24 is an electric push rod, which pushes the valve core to switch the straight-through valve core 22 to the reversing valve core 23. The valve core reset mechanism 25 is a spring, which resets the valve core when the electric push rod loses power, switching the reversing valve core 23 to the straight-through valve core 22.

[0041] Figure 2 A schematic diagram of the structure of a controller 26 provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the controller 26 includes a drive module, a valve group status acquisition module, a communication module, a storage module, a power module, and a main control module.

[0042] The drive module is used to control the action of the valve core drive mechanism 24 and the valve core reset mechanism 25 according to the signal from the main control module. As an example, the valve core drive mechanism 24 is an electric push rod, and the valve core reset mechanism 25 is a spring. The drive module only controls the action of the electric push rod. The valve group status acquisition module is used to collect the feedback signal when the valve core is switched into place and transmit it to the main control module, wherein the feedback signal can be provided by the built-in sensor of the electric push rod (such as a position sensor, a displacement sensor, etc.). The communication module is used to communicate with the battery pack's BMS battery management system to obtain the temperature of each battery cell detected by the BMS battery management system. The storage module is used to store battery cell temperature data. The power module is used to provide power support. The main control module is used to process battery cell temperature data and control the drive module when the processed battery cell temperature difference reaches a set value.

[0043] Figure 3 This is a structural diagram of a liquid cooling plate 100 for a battery pack provided in an embodiment of the present application. Figure 4Another structural diagram of a liquid cooling plate 100 of a battery pack provided in an embodiment of the present application is shown in FIG. Figure 3 and Figure 4 As shown, an embodiment of the present application further provides a battery pack, including the above-mentioned liquid cooling plate 100, a plurality of battery cells (not shown in the figure), and a BMS battery management system 200.

[0044] The liquid cooling plate body 10 is positioned at the bottom of the battery cells. The valve inlet 213 and valve outlet 214 of the reversing valve assembly 20 are connected to a liquid cooling unit, which is used to cool and transport the coolant. The BMS battery management system 200 is communicatively connected to the controller 26 of the reversing valve assembly 20 and the battery cells to detect the temperature of each battery cell and transmit it to the controller 26.

[0045] When the battery pack is running, the power module of the controller 26 supplies power to other modules, and the communication module communicates with the BMS battery management system 200 to obtain the temperature data of each battery cell and transmit it to the main control module. The main control module processes the battery cell temperature data and stores it in the storage module. Figure 3 As shown, combined Figure 1 The reversing valve group 20 can be in the first working state first, at this time the first valve core channel 221 of the direct valve core 22 is connected to the first docking port 211 and the valve group liquid inlet 213, and the second valve core channel 222 is connected to the second docking port 212 and the valve group liquid outlet 214. Figure 3 As shown by the middle arrow, the coolant flows out of the liquid cooling unit, flows through the valve group liquid inlet 213, the first valve core channel 221, the first docking port 211 in sequence, and then enters the first liquid inlet and outlet 11, then flows through the first main channel 13, the first branch channel 15 and the second branch channel 16, the second main channel 14, the second liquid inlet and outlet 12, and then enters the second docking port 212, and then flows through the second valve core channel 222 and the valve group liquid outlet 214 and returns to the liquid cooling unit, forming a cycle.

[0046] Because the coolant temperature is relatively low upon entering the liquid cooling plate body 10, and relatively high upon exiting after absorbing the heat from the battery cells, after the battery pack has been charging and discharging for a period of time, the battery cells near the first liquid inlet and outlet 11 and the first main channel 13 are relatively low in temperature, while the battery cells near the second liquid inlet and outlet 12 and the second main channel 14 are relatively high in temperature. Furthermore, the temperature difference between the two battery cells increases over time. When the temperature difference between the battery cells reaches a set value, the main control module of the controller 26 sends a signal to the drive module, which controls the valve core drive mechanism 24 to operate. Specifically, the drive module controls the electric push rod to power on, which pushes the valve core, switching the through valve core 22 to the reversing valve core 23 and maintaining the operation. The valve core status acquisition module of the controller 26 obtains the feedback signal indicating that the valve core has switched into position, detected by the built-in sensor of the electric push rod, and transmits it to the main control module. At this point, the reversing valve group 20 is in the second operating state.

[0047] like Figure 4 As shown, combined Figure 1 When the reversing valve group 20 is in the second working state, the third valve core channel 231 of the reversing valve core 23 is connected to the second docking port 212 and the valve group liquid inlet 213, and the fourth valve core channel 232 is connected to the first docking port 211 and the valve group liquid outlet 214. Figure 4 As shown by the middle arrow, the coolant flows out of the liquid cooling unit, passing through the valve block inlet 213, the third valve core channel 231, the second docking port 212, and then into the second liquid inlet and outlet 12. It then flows through the second main channel 14, the first branch channel 15 and the second branch channel 16, the first main channel 13, the first liquid inlet and outlet 11, and then into the first docking port 211. It then flows through the fourth valve core channel 232 and the valve block outlet 214 before returning to the liquid cooling unit, completing a cycle. Due to the reversed flow direction of the coolant, the higher-temperature battery cells near the second liquid inlet and outlet 12 and the second main channel 14 are cooled by the low-temperature coolant, rapidly reducing the temperature difference between the battery cells.

[0048] As time goes by, when the temperature difference of the battery cells increases again and reaches the set value, the main control module of the controller 26 sends a signal to the drive module, and the drive module controls the valve core drive mechanism 24 to operate. Specifically, the drive module controls the electric push rod to lose power, the electric push rod loses power, and the spring pushes the valve core to reset through the restoring force, switching the reversing valve core 23 to the straight valve core 22, and pushing the electric push rod back to its original position. Among them, the built-in sensor of the electric push rod is still powered, and the valve core status acquisition module can still obtain the feedback signal of the valve core switching into place detected by the built-in sensor of the electric push rod and transmit it to the main control module. At this time, the liquid cooling plate 100 is in the first working state. Because the flow direction of the coolant is reversed again, the battery cells near the first inlet and outlet 11 and the first main channel 13 are cooled by the low-temperature coolant again, and the temperature difference of the battery cells is rapidly reduced. Repeatedly switching the valve core of the reversing valve group 20 in this way can effectively reduce the temperature difference of the battery cells in the battery pack and ensure the consistency of the performance of the battery cells in the battery pack.

[0049] In summary, the liquid cooling plate and battery pack provided in the embodiments of the present application, the liquid cooling plate includes a liquid cooling plate body and a reversing valve group. Among them, a first shunt channel of a folding type is used on the liquid cooling plate body to dissipate heat to the battery cells in the middle area, and a second shunt channel arranged outside the first shunt channel is used to dissipate heat to the battery cells in other areas. This flow channel structure increases the flow channel length and heat exchange area, thereby improving the heat dissipation performance of the liquid cooling plate body. The reversing valve group changes the flow direction of the coolant in the liquid cooling plate body by switching the valve core, so that the low-temperature coolant cools the battery cells through which the high-temperature coolant that originally absorbs the heat of the battery cells flows, and the high-temperature coolant that absorbs the heat of the battery cells cools the battery cells through which the low-temperature coolant originally flows. This is equivalent to increasing the cooling effect on the high-temperature battery cells and reducing the cooling effect on the low-temperature battery cells, thereby effectively reducing the temperature difference of the battery cells in the battery pack and ensuring the consistency of the performance of the battery cells in the battery pack.

[0050] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the field can easily think of various changes or replacements within the technical scope disclosed in the present application, which should all be included in the scope of protection of the present application.

Claims

1. A liquid cooling plate, characterized in that: include: a liquid cooling plate body, wherein the liquid cooling plate body is provided with a first liquid inlet and outlet, a second liquid inlet and outlet, a first main channel, a second main channel, a first branch channel, and a second branch channel, the first liquid inlet and outlet being connected to the first main channel, the second liquid inlet and outlet being connected to the second main channel, the first main channel and the second main channel extending oppositely along a first direction, the first branch channel being a fold-back channel extending straight along a second direction, the first direction being perpendicular to the first direction, the first branch channel being arranged in the middle of the liquid cooling plate body in the first direction and having its two ends respectively connected to the first main channel and the second main channel, the second branch channel being arranged on the outside of the first branch channel and having its two ends respectively connected to the first main channel and the second main channel; and The reversing valve group includes a valve body, a valve core, a valve core driving mechanism, a valve core reset mechanism, and a controller. One end of the valve body is connected to the first inlet and outlet liquid ports and the second inlet and outlet liquid ports, and the other end of the valve body is used to connect to the liquid cooling unit. The valve core driving mechanism is used to drive the valve core to switch, and the valve core reset mechanism is used to drive the valve core to reset. The controller is used to control the valve core driving mechanism and the valve core reset mechanism to change the flow direction of the coolant delivered by the liquid cooling unit in the liquid cooling plate body.

2. The liquid cooling plate according to claim 1, wherein: The liquid cooling plate body is rectangular, having two side edges arranged along a first direction and another two side edges arranged along a second direction. The first liquid inlet and outlet and the second liquid inlet and outlet are arranged in the middle of one side edge of the liquid cooling plate body arranged along the first direction.

3. The liquid cooling plate according to claim 1, wherein: One end of the first main channel and one end of the second main channel are connected to the first inlet and outlet and the second inlet and outlet respectively, the first main channel near the middle and the second main channel near the middle are connected to the two ends of the first branch channel respectively, and the other end of the first main channel and the other end of the second main channel are connected to the two ends of the second branch channel respectively.

4. The liquid cooling plate according to claim 1, wherein: The second diverter channel includes a second diverter channel main body and a plurality of second diverter channel branches. The second diverter channel main body is a return channel extending in a straight line along the second direction. The second diverter channel main body is arranged on the outside of the first diverter channel and its two ends are respectively connected to the first main channel and the second main channel. The plurality of second diverter channel branches are distributed on the second diverter channel main body.

5. The liquid cooling plate according to claim 1, wherein: The valve body is provided with a first docking port, a second docking port, a valve group liquid inlet, and a valve group liquid outlet. The first docking port and the second docking port are connected to the first liquid inlet and outlet and the second liquid inlet and outlet respectively. The valve group liquid inlet and the valve group liquid outlet are used to connect to the liquid cooling unit.

6. The liquid cooling plate according to claim 5, characterized in that: The valve core includes a straight-through valve core and a reversing valve core, the straight-through valve core has a first valve core channel and a second valve core channel, the first valve core channel is used to connect the first docking port and the valve group liquid inlet, the second valve core channel is used to connect the second docking port and the valve group liquid outlet, the reversing valve core has a third valve core channel and a fourth valve core channel, the third valve core channel is used to connect the second docking port and the valve group liquid inlet, the fourth valve core channel is used to connect the first docking port and the valve group liquid outlet.

7. The liquid cooling plate according to claim 6, wherein: The first valve core channel, the second valve core channel, the third valve core channel, and the fourth valve core channel are all made of metal conduits and are wrapped with heat insulation materials on the outside.

8. The liquid cooling plate according to claim 1, wherein: The valve core driving mechanism is an electric push rod, and the valve core reset mechanism is a spring.

9. The liquid cooling plate according to claim 1, wherein: The controller includes a driving module, a valve group status acquisition module, a communication module, a storage module, a power module, and a main control module. The driving module is used to control the valve core driving mechanism and the valve core reset mechanism according to the signal of the main control module. The valve group status acquisition module is used to collect the feedback signal when the valve core is switched to the position and transmit it to the main control module. The communication module is used to communicate with the BMS battery management system to obtain battery cell temperature data. The storage module is used to store battery cell temperature data. The power module is used to provide power support. The main control module is used to process battery cell temperature data and control the driving module when the battery cell temperature difference reaches a set value.

10. A battery pack, characterized in that: It comprises a liquid cooling plate according to any one of claims 1 to 9, a plurality of battery cells, and a BMS battery management system, wherein the liquid cooling plate is in contact with the plurality of battery cells for cooling and dissipating heat, and the BMS battery management system is communicatively connected with a controller of a reversing valve group of the liquid cooling plate and the plurality of battery cells for detecting the temperature of the plurality of battery cells and transmitting the temperature to the controller.

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