Power battery liquid cooling device and system

Abstract

The utility model discloses a power battery liquid cooling device and system, the power battery liquid cooling device comprises a bottom plate and a plurality of liquid cooling plates detachably mounted on the bottom plate, the plurality of liquid cooling plates are arranged in parallel at intervals, and a battery cell set is arranged between every two adjacent liquid cooling plates; the liquid cooling plate is in an inverted T shape, a heat pipe used for conducting bottom heat dissipation on the battery cell set is embedded in the lower surface of the liquid cooling plate, a condensation section of the heat pipe is close to a liquid inlet of the liquid cooling plate, and an evaporation section of the heat pipe is close to a liquid outlet of the liquid cooling plate. The temperature uniformity of the battery pack can be improved, the liquid leakage risk is greatly reduced, meanwhile, the disassembly and assembly are convenient, and the later maintenance difficulty is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery thermal management, in particular to a power battery liquid cooling device and system. BACKGROUND

[0002] With the increasing global awareness of clean energy and environmental protection, electric vehicles, as an important solution for green travel, have become increasingly prominent in the market. As the core power source of electric vehicles, power batteries generate a large amount of heat during operation. If the heat cannot be effectively dissipated, it will seriously affect the performance and shorten the service life. During the heat dissipation process, each battery monomer needs to maintain the same temperature as much as possible, otherwise the temperature imbalance between the battery monomers will affect the performance and life of the entire battery pack.

[0003] Currently, high-rate charging and discharging poses a higher challenge to the thermal management system of the battery pack. Excessive temperature rise of the battery cells in the battery pack can easily cause thermal runaway. Excessive temperature difference can easily cause overcharging and overdischarging of the battery cells, thereby causing fire, explosion and other safety accidents. The heat dissipation efficiency and temperature uniformity of the current battery pack thermal management system need to be further improved.

[0004] In the current multi-face cooling liquid cooling scheme, liquid cooling plates are often arranged at the bottom and sides of the battery cells, which requires a large flow of cooling liquid. If the flow channels of the liquid cooling plates at the bottom and sides of the battery cells are connected in one body, a large amount of sealing welding is required, which increases the risk of liquid leakage. In addition, the above schemes also have the problem of difficult disassembly and assembly. Therefore, the present application provides a power battery liquid cooling device and system. CONTENT OF THE INVENTION

[0005] The present application provides a power battery liquid cooling device and system, which can improve the temperature uniformity of the battery pack, greatly reduce the risk of liquid leakage, and facilitate disassembly and assembly, and reduce the difficulty of later maintenance.

[0006] The first aspect of the present application provides a power battery liquid cooling device, comprising: a bottom plate and a liquid cooling plate detachably mounted on the bottom plate;

[0007] The number of liquid cooling plates is multiple, multiple liquid cooling plates are arranged in parallel and at intervals, and an electric cell set is arranged between adjacent two liquid cooling plates.

[0008] The liquid cooling plate is in the shape of an inverted "T", and a heat pipe for bottom heat dissipation of the electric cell set is embedded on the lower surface of the liquid cooling plate.

[0009] The condensation section of the heat pipe is close to the liquid inlet of the liquid cooling plate;

[0010] The evaporation section of the heat pipe is close to the liquid outlet of the liquid cooling plate.

[0011] Optionally, an upper surface of the bottom plate is provided with a positioning groove.

[0012] The liquid cooling plate is detachably installed in the positioning groove.

[0013] Optionally, a lower surface of the liquid cooling plate is provided with a mounting groove.

[0014] The heat pipe is embedded in the mounting groove.

[0015] Optionally, the bottom of the heat pipe is provided with aerogel.

[0016] Optionally, the liquid cooling plate is internally provided with a fence type flow channel.

[0017] Optionally, the fence type flow channel comprises an upper horizontal flow channel, a lower horizontal flow channel, and a plurality of vertical flow channels arranged between the upper horizontal flow channel and the lower horizontal flow channel.

[0018] The vertical flow channels are respectively connected to the upper horizontal flow channel and the lower horizontal flow channel at both ends.

[0019] The second aspect of the application provides a power battery liquid cooling system, comprising a cooling circulation module and the power battery liquid cooling device.

[0020] The cooling circulation module comprises a circulation pipeline and a cooling circulation assembly arranged on the circulation pipeline.

[0021] The circulation pipeline is respectively connected to the power battery liquid cooling device through an inlet pipeline and an outlet pipeline at both ends.

[0022] Optionally, the inlet pipeline comprises a first mother pipe and a plurality of first branch pipes.

[0023] The number of first branch pipes is equal to the number of liquid cooling plates, and is arranged one-to-one.

[0024] One end of the first mother pipe is connected to one end of the circulation pipeline, and the other end is connected to one end of the plurality of first branch pipes.

[0025] The other end of the plurality of first branch pipes is respectively connected to the inlet of the plurality of liquid cooling plates.

[0026] The outlet pipeline comprises a second mother pipe and a plurality of second branch pipes.

[0027] The number of second branch pipes is equal to the number of liquid cooling plates, and is arranged one-to-one.

[0028] One end of the second mother pipe is connected to the other end of the circulation pipeline, and the other end is connected to one end of the plurality of second branch pipes.

[0029] The other end of each of the second branch pipes is connected to the liquid outlet of each of the liquid cooling plates.

[0030] Optionally, it also includes: a control system;

[0031] Each of the first branch pipes is equipped with a flow control valve;

[0032] A temperature sensor is installed on the battery cell assembly;

[0033] Both the flow control valve and the temperature sensor are communicatively connected to the control system.

[0034] Optionally, the control system is communicatively connected to the battery pack BMS system.

[0035] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This power battery liquid cooling device uses an inverted "T"-shaped liquid cooling plate to dissipate heat on the sides and bottom of the battery cell, which can greatly improve the temperature uniformity of the battery pack. The method of embedding heat pipes at the bottom of the liquid cooling plate instead of the bottom liquid cooling plate simplifies the structure, improves the efficiency of coolant use, and avoids the risk of leakage caused by poor sealing of the flow channel between the liquid cooling plate and the bottom plate. At the same time, the liquid cooling plate is also easy to disassemble and replace, which provides convenience for the subsequent after-sales maintenance of the entire battery pack. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the power battery liquid cooling device in the embodiments of this application;

[0037] Figure 2 This is a schematic diagram of the liquid cooling plate structure in an embodiment of this application;

[0038] Figure 3 for Figure 2 Cross-sectional view along the AA direction;

[0039] Figure 4 for Figure 3 Enlarged detail view of section B;

[0040] Figure 5 This is a top view of the power battery liquid cooling device in the embodiments of this application;

[0041] Figure 6 for Figure 5 Cross-sectional view in the CC direction;

[0042] Figure 7 for Figure 5 Cross-sectional view in the DD direction;

[0043] Figure 8 for Figure 7 Enlarged detail of section E in the middle;

[0044] Figure 9 The schematic diagram of the power battery liquid cooling system in the embodiment of the present application is shown in the figure;

[0045] In the figure, the reference signs are:

[0046] 1-liquid cooling plate, 11-inlet, 12-outlet, 13-fence type flow channel, 14-mounting groove, 2-bottom plate, 3-heat pipe, 4-flow control valve, 5-inlet pipeline, 6-outlet pipeline, 7-aerogel. DETAILED DESCRIPTION

[0047] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiment of the present application will be described clearly and completely in combination with the figures in the embodiment of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the present application.

[0048] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the figure, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0049] Unless otherwise expressly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For the person skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] The present application provides an embodiment of a power battery liquid cooling device, please refer to Figures 1 to 8 .

[0051] The power battery liquid cooling device in the embodiment comprises a bottom plate 2 and liquid cooling plates 1 detachably mounted on the bottom plate 2, the number of the liquid cooling plates 1 is multiple, the multiple liquid cooling plates 1 are arranged in parallel and at intervals, and an electric core set (the electric core set is composed of multiple electric cores) is arranged between the two adjacent liquid cooling plates 1; the liquid cooling plate 1 is in an inverted "T" shape, and a heat pipe 3 for bottom heat dissipation of the electric core set is embedded on the lower surface of the liquid cooling plate 1, the condensation section of the heat pipe 3 is close to the liquid inlet 11 of the liquid cooling plate 1, and the evaporation section of the heat pipe 3 is close to the liquid outlet 12 of the liquid cooling plate 1, so that the temperature of the cooling liquid in the whole liquid cooling plate 1 is more uniform, which is more conducive to improving the temperature uniformity of the battery pack and is also convenient for controlling the temperature of the electric core set by adjusting the flow in the later stage.

[0052] It should be noted that: the power battery liquid cooling device can greatly improve the temperature uniformity of the battery pack by adopting the inverted "T" shaped liquid cooling plate 1 to dissipate heat from the side surface and the bottom surface of the electric core set, wherein the heat pipe 3 embedded at the bottom of the liquid cooling plate 1 is used to replace the bottom liquid cooling plate, which simplifies the structure, improves the use efficiency of the cooling liquid, avoids the leakage danger caused by poor sealing of the flow channel between the liquid cooling plate 1 and the bottom plate 2, and also facilitates the disassembly and replacement of the liquid cooling plate 1, thereby providing convenience for the subsequent after-sales maintenance of the whole battery pack.

[0053] The above is an embodiment one of the power battery liquid cooling device provided by the embodiment of the application, and the following is an embodiment two of the power battery liquid cooling device provided by the embodiment of the application, please refer to Figures 1 to 8 .

[0054] The power battery liquid cooling device in the embodiment comprises a bottom plate 2 and liquid cooling plates 1 detachably mounted on the bottom plate 2, the number of the liquid cooling plates 1 is multiple (the number of the liquid cooling plates 1 is determined according to the size of the battery pack or the module), the multiple liquid cooling plates 1 are arranged in parallel and at intervals, and an electric core set (the electric core set is composed of multiple electric cores) is arranged between the two adjacent liquid cooling plates 1; the liquid cooling plate 1 is in an inverted "T" shape, and a heat pipe 3 for bottom heat dissipation of the electric core set is embedded on the lower surface of the liquid cooling plate 1, the condensation section of the heat pipe 3 is close to the liquid inlet 11 of the liquid cooling plate 1, and the evaporation section of the heat pipe 3 is close to the liquid outlet 12 of the liquid cooling plate 1, so that the temperature of the cooling liquid in the whole liquid cooling plate 1 is more uniform, which is more conducive to improving the temperature uniformity of the battery pack and is also convenient for controlling the temperature of the electric core set by adjusting the flow in the later stage.

[0055] The upper surface of the bottom plate 2 is provided with a positioning groove, and the liquid cooling plate 1 is detachably mounted in the positioning groove in a mechanical connection mode.

[0056] It should be noted that the plurality of inverted "T" shaped liquid cooling plates 1 provide cooling for the side (cell large surface) and bottom of the battery module, and cancel the flow channel structure of the bottom plate 2 (replace the bottom liquid cooling plate with the way of embedding heat pipes 3 at the bottom of the inverted "T" shaped liquid cooling plate 1) relative to other multi-surface cooling structures, thereby simplifying the structure, improving the use efficiency of the cooling liquid, avoiding the risk of liquid leakage due to poor sealing between the liquid cooling plate 1 and the bottom plate 2, and facilitating the disassembly and replacement of the liquid cooling plate 1, thereby providing convenience for subsequent after-sales maintenance of the entire battery pack.

[0057] The lower surface of the liquid cooling plate 1 is provided with a mounting groove 14, and the heat pipe 3 is embedded in the mounting groove 14.

[0058] The bottom of the heat pipe 3 is provided with aerogel 7, and specifically, the liquid cooling plate 1, the heat pipe 3 and the aerogel 7 are fixed in the positioning groove of the bottom plate 2 from top to bottom.

[0059] It can be understood that since the temperature of the bottom plate 2 is greatly affected by seasons and environment, which is not conducive to the adjustment of the temperature of the battery module, the temperature influence of the bottom plate 2 on the liquid cooling plate 1 can be reduced by using the heat insulation function of the aerogel 7.

[0060] The liquid cooling plate 1 is provided with a fence type flow channel 13, and by arranging the fence type flow channel 13, the cell cluster between the adjacent two liquid cooling plates 1 can be in a similar cooling environment.

[0061] It should be noted that the condensation section of the embedded heat pipe 3 is close to the liquid inlet 11 of the liquid cooling plate 1, and the evaporation section is close to the liquid outlet 12 of the liquid cooling plate 1, so that the temperature of the cooling liquid of the entire liquid cooling plate 1 is more uniform, and in combination with the fence type flow channel 13, the temperature difference of the cell cluster is smaller, which is more conducive to the subsequent automatic temperature adjustment.

[0062] The fence type flow channel 13 includes an upper horizontal flow channel, a lower horizontal flow channel and a plurality of vertical flow channels arranged between the upper horizontal flow channel and the lower horizontal flow channel, and the two ends of the vertical flow channel are respectively connected with the upper horizontal flow channel and the lower horizontal flow channel. Preferably, the width of the upper horizontal flow channel and the width of the lower horizontal flow channel are both greater than the width of the vertical flow channel, and the distance between the lower horizontal flow channel and the upper surface of the heat pipe 3 is as small as possible, so as to fully play the role of the heat pipe 3.

[0063] As shown in Figure 9 It should be noted that the condensation section of the embedded heat pipe 3 is close to the liquid inlet 11 of the liquid cooling plate 1, and the evaporation section is close to the liquid outlet 12 of the liquid cooling plate 1, so that the temperature of the cooling liquid of the entire liquid cooling plate 1 is more uniform, and in combination with the fence type flow channel 13, the temperature difference of the cell cluster is smaller, which is more conducive to the subsequent automatic temperature adjustment.

[0064] The inlet pipe 5 includes a first mother pipe and a plurality of first branch pipes, the number of the first branch pipes is equal to the number of the liquid cooling plates 1, and the first branch pipes are arranged one by one in correspondence; one end of the first mother pipe is connected with one end of the circulating pipe, and the other end is connected with one end of the plurality of first branch pipes; the other end of the plurality of first branch pipes is respectively connected with the liquid inlet 11 of the plurality of liquid cooling plates 1; the outlet pipe 6 includes a second mother pipe and a plurality of second branch pipes, the number of the second branch pipes is equal to the number of the liquid cooling plates 1, and the second branch pipes are arranged one by one in correspondence; one end of the second mother pipe is connected with the other end of the circulating pipe, and the other end is connected with one end of the plurality of second branch pipes; the other end of the plurality of second branch pipes is respectively connected with the liquid outlet 12 of the plurality of liquid cooling plates 1.

[0065] Further comprising: a control system, the plurality of first branch pipes are respectively provided with flow control valves 4, the battery cell set is provided with a temperature sensor, the flow control valves 4 and the temperature sensor are in communication connection with the control system, the flow data and the temperature data of each liquid cooling plate 1 can be transmitted to the control system in real time, the control system can set the maximum value and the minimum value of the temperature of the battery cell set, find the highest temperature and the lowest temperature of the battery cell set transmitted back by the temperature sensor by comparison, compare the highest temperature and the lowest temperature with the pre-set temperature range, and then adjust the cooling liquid temperature and the cooling liquid flow of the two liquid cooling plates 1 adjacent to the battery cell set.

[0066] It can be understood that the plurality of flow control valves 4 can also be combined into one whole, and the flow of each liquid cooling plate 1 is controlled respectively. Preferably, the flow control valve 4 is of a flow meter type, which is accurate in control and fast in response.

[0067] The control system can be in communication connection with the battery pack BMS system.

[0068] In specific implementation, the principle of automatically adjusting the flow of the liquid cooling plate 1 is as follows: when the structure and material of the liquid cooling device are determined, the cooling effect of a certain area mainly depends on the flow and temperature of the cooling liquid. The maximum and minimum values of the battery pack temperature are set by the control system, which can be set to a reasonable range according to the manufacturer's recommendations and actual conditions. In the utility model, the battery pack between the two adjacent liquid cooling plates 1 is in a similar cooling environment, and the temperature difference is small under normal circumstances. When the temperature sensor on the battery pack transmits the battery temperature data to the control system, the control system finds the highest and lowest temperatures of each battery pack by comparison, and compares the highest and lowest temperatures with the pre-set temperature range. When the temperature range of the battery pack is not within the set range, such as when the highest temperature of the battery pack is higher than the set highest temperature, or the lowest temperature of the battery pack is lower than the set lowest temperature, or other conditions are not met, the control system adjusts the cooling liquid flow of the two adjacent liquid cooling plates 1 of the battery pack. If there are multiple battery packs, especially more than half of the battery packs, the temperature range of which is not within the set range, the flow of multiple liquid cooling plates 1 needs to be adjusted, and the temperature of the cooling liquid needs to be adjusted appropriately, so that the temperature range of all battery packs is within the set range.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features. These modifications or replacements do not change the essence of the corresponding technical solutions, and are within the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A power battery liquid cooling device, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

2. The liquid cooling device for power battery according to claim 1, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

3. The liquid cooling device for power battery according to claim 1, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

4. The liquid cooling device for power battery according to claim 3, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

5. The liquid cooling device for power battery according to claim 1, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

6. The liquid cooling device of the power battery according to claim 5, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

7. A power battery liquid cooling system, characterized in that, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

8. The liquid-cooled power battery system of claim 7, wherein, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

9. The liquid-cooled power cell system of claim 8, wherein, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling.

10. The liquid-cooled power battery system of claim 9, wherein, The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled device for a power battery, and belongs to the technical field of battery cooling. The application relates to a liquid-cooled

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