Battery box heat management evaluation system

Abstract

The utility model discloses a thermal management evaluation system for a battery box, and relates to the technical field of battery management. The system comprises a to-be-tested battery box, an air cooling system, a liquid cooling system, an immersed cooling system and a control system, wherein the interior of the to-be-tested battery box comprises at least one real battery cell and a plurality of simulated battery cells; wherein each simulation battery cell comprises a battery shell, the battery shell is filled with simulation electrolyte, first temperature sensors are arranged in the real battery cell and the simulation battery cells, and a power resistor is connected between the positive electrode and the negative electrode of each simulation battery cell; the air cooling system and the liquid cooling system are arranged in the to-be-tested battery box, the immersed cooling system is connected with the to-be-tested battery box, and the control system is electrically connected with the first temperature sensor, the second temperature sensor, the power resistor, the air cooling system, the liquid cooling system and the immersed cooling system. According to the system provided by the embodiment of the utility model, the temperature management effects of various temperature management systems can be evaluated.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a battery box thermal management evaluation system. Background Art

[0002] The performance and life of the battery are greatly affected by its operating temperature. Too high or too low a temperature may cause the battery performance to deteriorate or even be damaged. Therefore, effective thermal management is crucial to ensure the stability of the energy storage battery box and extend its service life. At present, the thermal management of the energy storage battery box mainly adopts the following methods: air cooling system, liquid cooling system and immersion cooling system. Although the above thermal management methods can meet the cooling needs of the energy storage battery box to a certain extent, in actual applications, the design and optimization of these systems often rely on simulation calculation results. Although simulation calculations can provide theoretical guidance, they lack the support of actual test data, and it is difficult to fully evaluate the performance of the thermal management system under different working conditions. The simulation calculation results may not fully reflect the complex situations in actual applications, resulting in deviations in the design of the thermal management system. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery box thermal management evaluation system, which can evaluate the temperature control effects of various thermal management systems and provide a reference for the thermal management of the battery box.

[0004] The battery box thermal management evaluation system according to the embodiment of the utility model includes:

[0005] A battery box to be tested, wherein the interior of the battery box to be tested includes at least one real battery cell and multiple simulated battery cells, and the at least one real battery cell and the multiple simulated battery cells are connected in series in a preset arrangement order; wherein each of the simulated battery cells includes a battery shell, the interior of the battery shell is filled with a simulated electrolyte, a first temperature sensor is arranged inside the real battery cell and the simulated battery cell, and a power resistor is connected between the positive and negative electrodes of each of the simulated battery cells;

[0006] An air cooling system is arranged in the battery box to be tested;

[0007] A liquid cooling system is arranged in the battery box to be tested;

[0008] An immersion cooling system connected to the battery box to be tested;

[0009] A control system is electrically connected to the first temperature sensor, the power resistor, the air cooling system, the liquid cooling system and the immersion cooling system respectively.

[0010] According to some embodiments of the present invention, a heating element is provided at the bottom of the real battery cell, and the heating element is electrically connected to the control system.

[0011] According to some embodiments of the utility model, an atomizing nozzle is provided in the battery box to be tested, the atomizing nozzle is connected to one end of a water pump, the other end of the water pump is connected to a liquid storage tank, a first solenoid valve is provided between the liquid storage tank and the water pump, a cooling medium is stored in the liquid storage tank, and the first solenoid valve and the water pump are both electrically connected to the control system.

[0012] According to some embodiments of the utility model, the liquid cooling system includes a first liquid cooling plate, a second liquid cooling plate and a phase change material, the simulated battery cell and the real battery cell are embedded in the phase change material, the first liquid cooling plate is arranged at the top of the phase change material, the second liquid cooling plate is arranged at the bottom of the phase change material, the first liquid cooling plate is provided with a first water inlet and a first water outlet that are interconnected, and the second liquid cooling plate is provided with a second water inlet and a second water outlet that are interconnected.

[0013] According to some embodiments of the utility model, the immersion cooling system includes a cooling water tank and a circulating pump, the cooling water tank stores cooling water, the liquid outlet of the cooling water tank is connected to one end of the circulating pump, the other end of the circulating pump is connected to the liquid inlet of the battery box to be tested, the liquid outlet of the battery box to be tested is connected to the liquid inlet of the cooling water tank, a second solenoid valve is provided at the liquid inlet of the battery box to be tested, and a third solenoid valve is provided at the liquid outlet of the battery box to be tested.

[0014] According to some embodiments of the present utility model, a temperature regulating device is provided in the cooling water tank.

[0015] According to some embodiments of the present utility model, the battery box to be tested is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief valve.

[0016] According to some embodiments of the utility model, an air inlet is provided on one side of the battery box to be tested, and an air outlet is provided on the other side of the battery box to be tested, and the air cooling system includes a cooling fan and a heat sink, the cooling fan is arranged at the air inlet, and the heat sink is connected to the simulated battery cell and the real battery cell.

[0017] According to some embodiments of the present invention, a heat-conducting layer is provided on the surface of the battery box to be tested.

[0018] According to some embodiments of the present invention, the tabs of the real battery cell and the simulated battery cell are provided with a second temperature sensor.

[0019] The battery box thermal management evaluation system according to the embodiment of the utility model has at least the following beneficial effects: by using simulated battery cells with properties close to those of real battery cells, the effects of different thermal management strategies (air cooling, liquid cooling and immersion cooling) in actual applications can be accurately evaluated; by real-time temperature monitoring, actual temperature data support can be provided for the design of the thermal management system of the battery box, which helps to optimize and improve the thermal management scheme; by using some simulated battery cells instead of real battery cells, the test cost is reduced while maintaining a high degree of simulation of the test; through optional electrolyte replacement, the heat conduction effect in different environments can be simulated, thereby enhancing the universality of the test results.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 A schematic diagram of the structure of a battery box thermal management evaluation system according to an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the connection between a real battery cell and a simulated battery cell according to an embodiment of the utility model;

[0024] Figure 3 It is a structural schematic diagram of an immersion cooling system according to an embodiment of the utility model;

[0025] The battery box to be tested 100, the real battery cell 110, the simulated battery cell 120, the power resistor 130, the heating element 140, the pressure relief port 150, the air cooling system 200, the liquid cooling system 300, the immersion cooling system 400, the cooling water tank 410, the circulating pump 420, the second solenoid valve 430, the third solenoid valve 440, and the control system 500. DETAILED DESCRIPTION

[0026] Embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0028] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the utility model and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0029] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The performance and life of the battery are greatly affected by its operating temperature. Too high or too low a temperature may cause the battery performance to deteriorate or even be damaged. Therefore, effective thermal management is crucial to ensure the stability of the energy storage battery box and extend its service life. At present, the thermal management of the energy storage battery box mainly adopts the following methods: air cooling system, liquid cooling system and immersion cooling system. Although the above thermal management methods can meet the cooling needs of the energy storage battery box to a certain extent, in actual applications, the design and optimization of these systems often rely on simulation calculation results. Although simulation calculations can provide theoretical guidance, they lack the support of actual test data, and it is difficult to fully evaluate the performance of the thermal management system under different working conditions. The simulation calculation results may not fully reflect the complex situations in actual applications, resulting in deviations in the design of the thermal management system.

[0031] To this end, an embodiment of the utility model proposes a battery box thermal management evaluation system. By using simulated battery cells with properties close to real battery cells, the effects of different thermal management strategies (air cooling, liquid cooling and immersion cooling) in actual applications can be accurately evaluated; by real-time temperature monitoring, actual temperature data support can be provided for the design of the thermal management system of the battery box, which helps to optimize and improve the thermal management scheme; by using some simulated battery cells instead of real battery cells, the test cost is reduced while maintaining a high degree of simulation of the test; through optional electrolyte replacement, the heat conduction effect in different environments can be simulated, thereby enhancing the universality of the test results.

[0032] The present utility model embodiment proposes a battery box thermal management evaluation system, such as Figure 1 and Figure 2 As shown, the system includes a battery box 100 to be tested, an air cooling system 200, a liquid cooling system 300, an immersion cooling system 400 and a control system 500; wherein, the interior of the battery box 100 to be tested includes at least one real battery cell 110 and multiple simulated battery cells 120, and at least one real battery cell 110 and multiple simulated battery cells 120 are connected in series in a preset arrangement order; wherein, each simulated battery cell 120 includes a battery shell, the interior of the battery shell is filled with a simulated electrolyte, and the interior of the real battery cell 110 and the simulated battery cell 120 is provided with a first temperature sensor, and a power resistor 130 is connected between the positive and negative poles of each simulated battery cell 120; the air cooling system 200 and the liquid cooling system 300 are arranged in the battery box 100 to be tested, and the immersion cooling system 400 is connected to the battery box 100 to be tested; the control system 500 is electrically connected to the first temperature sensor, the power resistor 130, the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 respectively.

[0033] Specifically, the battery shell of each simulated battery cell 120 has the same structure and size as the real battery cell 110, and a simulated electrolyte is filled inside each battery shell, but does not contain a positive electrode, a negative electrode and a diaphragm material to form a simulated battery cell 120. In order to ensure the accuracy of the test results, it is necessary to make the characteristic parameters of the simulated battery cell 120 basically consistent with the characteristic parameters of the real battery cell 110. To this end, when making the simulated battery cell 120, a simulated electrolyte with properties close to those of the real battery cell 110 is injected into the inside of the battery shell. After the simulated battery cell 120 is formed, it is necessary to test the simulated battery cell 120 to obtain parameters such as the specific heat capacity, thermal conductivity and heating power of the simulated battery cell 120 to ensure that the errors between the various parameters of the simulated battery cell 120 and the various parameters of the real battery cell 110 are within the preset range.

[0034] After completing the production of the simulated battery cell 120, at least one real battery cell 110 and multiple simulated battery cells 120 are arranged and connected in series in a certain order to form a battery box 100 to be tested, thereby simulating the working state of the real battery box. At the same time, a first temperature sensor is provided inside each real battery cell 110 and simulated battery cell 120, and the temperature of each battery cell can be monitored in real time through the first temperature sensor. In addition, a power resistor 130 is connected between the positive and negative poles of each simulated battery cell 120. By controlling the current flowing through the power resistor 130 to change the heat generated by the power resistor 130, the heating condition of the battery cell under different operating conditions can be simulated.

[0035] After the battery box 100 to be tested is connected to the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 respectively, the battery box 100 to be tested is tested to evaluate the temperature management effects of the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400, and to evaluate and compare the control effects of each system under different working conditions. To this end, when testing, a control system 500 is used to set a plurality of different working powers, and a corresponding working current is provided to the power resistor 130 in turn according to the plurality of powers, so that the simulated battery cell 120 and the real battery cell 110 are heated at different heating rates. It should be noted that the control system 500 may include a controller and a constant current source, and the controller is used to control the working state of each device, and can control the constant current source to generate currents of different sizes, so that each simulated battery cell 120 and the real battery cell 110 has different heating powers, thereby simulating different working conditions. Corresponding to each different working current, it is necessary to use the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 to cool down the battery box 100 to verify the cooling effects of the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 under different working conditions. For example, after the control system 500 provides the first current to the power resistor 130, the battery box 100 to be tested is cooled down by the air cooling system 200 to verify the cooling effect of the air cooling system 200 under the first current; similarly, after the control system 500 provides the first current to the power resistor 130, the battery box 100 to be tested is cooled down by the liquid cooling system 300 / immersion cooling system 400 to verify the cooling effect of the liquid cooling system 300 / immersion cooling system 400 under the first current; then, the first current is changed to the second current to verify the cooling effects of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 under the second current, and so on.

[0036] In order to verify the cooling effect of each system, in each process, the temperature of each simulated battery cell 120 is obtained through the first temperature sensor, so as to calculate the temperature average value of the simulated battery cell 120. At the same time, the maximum and minimum temperatures of all simulated battery cells 110 and real battery cells 120 in the battery box 100 to be tested can be recorded at each current to determine that each battery cell is working at a normal temperature. At each working current / working power, the change of the average temperature value under the action of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 is recorded, so that the temperature control effect of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 can be determined according to the change of the average temperature value. The faster the temperature average value drops, the better the corresponding temperature control effect is, and the slower the temperature average value drops, the worse the corresponding temperature control effect is.

[0037] Through the above experiments, it is possible to verify whether the temperature control effect of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 under different working conditions meets expectations, and to determine whether the temperature control effect of each system needs to be optimized accordingly. At the same time, the temperature control effects of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 under different working conditions can be compared, so as to formulate a temperature management strategy based on the comparison results, optimize the temperature management of the real battery box, and thus ensure the normal operation of the real battery box.

[0038] According to the battery box thermal management evaluation system of the embodiment of the utility model, by using simulated battery cells 120 with properties close to those of real battery cells 110, the effects of different thermal management strategies in actual applications can be accurately evaluated; through real-time monitoring and data analysis, actual temperature data support can be provided for the design of the thermal management system of the real battery box, which is helpful to optimize and improve the thermal management scheme; by using some simulated battery cells 120 instead of real battery cells 110, the test cost is reduced while maintaining a high degree of simulation of the test; through optional electrolyte replacement, the heat conduction effect in different environments can be simulated, thereby enhancing the universality of the test results; by providing different working powers, the temperature control effect of the air cooling system 200 / liquid cooling system 300 / immersion cooling system 400 under different working conditions can be verified, and the temperature control effects of the three can be compared, so as to formulate a battery box temperature management strategy for the real battery box according to the comparison results.

[0039] Furthermore, if Figure 2As shown, in some embodiments of the present invention, a heating element 140 is provided at the bottom of the real battery cell 110, and the heating element 140 is electrically connected to the control system 500. By providing the heating element 140 at the bottom of the real battery cell 110, the control system 500 can start the heating element 140 to heat the real battery cell 110, thereby simulating the situation where the real battery cell 110 has thermal runaway. In this case, when the real battery cell 110 has thermal runaway, the current temperature of the battery cell 120 is simulated by the first temperature sensor to determine the thermal conductivity of the real battery cell 110 in thermal runaway. At the same time, the battery box 100 to be tested is cooled by the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 respectively, thereby determining the cooling effect of the air cooling system 200, the liquid cooling system 300 and the immersion cooling system 400 on the battery thermal runaway. By simulating the thermal runaway of the real battery cell 110, the effect of different thermal management strategies in dealing with thermal runaway in practical applications can be accurately evaluated.

[0040] Furthermore, in some embodiments of the utility model, an atomizing nozzle is provided in the battery box 100 to be tested, the atomizing nozzle is connected to one end of the water pump, the other end of the water pump is connected to the liquid storage tank, a first solenoid valve is provided between the liquid storage tank and the water pump, a cooling medium is stored in the liquid storage tank, and the first solenoid valve and the water pump are both electrically connected to the control system 500. Specifically, when the first temperature sensor detects that the temperature of a certain battery cell has reached a temperature value close to thermal runaway, it means that the battery cell is about to / has thermal runaway, in order to avoid the phenomenon of spontaneous combustion of the entire battery box 100 to be tested due to thermal runaway of a certain battery cell, at this time, the first solenoid valve is opened, and the water pump transfers the cooling medium in the liquid storage tank to the atomizing nozzle, after the cooling medium is atomized by the atomizing nozzle, it is sprayed on the surface of the battery cell to cool the battery cell and prevent the temperature of the battery cell from being too high and catching fire. Through this scheme, the control effect of the atomizing nozzle when the battery cell has thermal runaway can be verified.

[0041] Furthermore, in some embodiments of the present invention, the liquid cooling system 300 includes a first liquid cooling plate, a second liquid cooling plate and a phase change material, the simulated battery cell 120 and the real battery cell 110 are embedded in the phase change material, the first liquid cooling plate is arranged on the top of the phase change material, the second liquid cooling plate is arranged on the bottom of the phase change material, the first liquid cooling plate is provided with a first water inlet and a first water outlet that are interconnected, and the second liquid cooling plate is provided with a second water inlet and a second water outlet that are interconnected; at the same time, the first liquid cooling plate and the second liquid cooling plate can be connected through a plurality of pipes arranged on the surface of the simulated battery cell 120 / the real battery cell 110. When the battery box 100 to be tested is cooled by the liquid cooling system, a cooling liquid is introduced into the first liquid cooling plate and the second liquid cooling plate, and the real battery cell 110 / the simulated battery cell 120 is cooled by the cooling liquid.

[0042] Furthermore, in some embodiments of the present invention, the immersion cooling system includes a cooling water tank 410 and a circulating pump 420, the cooling water tank 410 stores cooling water, the liquid outlet of the cooling water tank 410 is connected to one end of the circulating pump 420, the other end of the circulating pump 420 is connected to the liquid inlet of the battery box 100 to be tested, the liquid outlet of the battery box 100 to be tested is connected to the liquid inlet of the cooling water tank 410, a second solenoid valve 430 is provided at the liquid inlet of the battery box 100 to be tested, and a third solenoid valve 440 is provided at the liquid outlet of the battery box 100 to be tested. When the immersion cooling system is selected to cool the battery box 100 to be tested, the second solenoid valve 430 is opened, the third solenoid valve 440 is closed, and the circulating pump 420 pumps the cooling water in the cooling water tank 410 into the battery box 100 to be tested; when the height of the cooling water in the battery box 100 to be tested reaches a preset height, the third solenoid valve 440 is opened, and the circulating pump 420 circulates the cooling water in the cooling water tank 410 into the battery box 100 to be tested. By injecting cooling water into the battery box 100 to be tested, the battery cells are immersed in the cooling water to cool the battery cells.

[0043] Furthermore, in some embodiments of the present invention, a temperature regulating device is provided in the cooling water tank 410. The temperature regulating device is used to increase or decrease the temperature of the cooling water, so that the immersion cooling system can adjust the temperature of the cooling water according to the need for cooling.

[0044] Furthermore, in some embodiments of the present invention, the battery box 100 to be tested is provided with a pressure relief port, and a pressure relief valve is provided at the pressure relief port. When the air pressure in the battery box 100 to be tested is too high, the pressure relief valve can be opened to release the pressure of the battery box 100 to be tested through the pressure relief port, so as to avoid affecting the normal operation of the battery cell due to excessive air pressure.

[0045] Further, in some embodiments of the present invention, an air inlet is provided on one side of the battery box 100 to be tested, and an air outlet is provided on the other side of the battery box 100 to be tested, and the air cooling system includes a heat dissipation fan and a heat sink, the heat dissipation fan is provided at the air inlet, and the heat sink is connected to the simulated battery cell 120 and the real battery cell 110. When the simulated battery cell 120 and the real battery cell 110 are cooled by the air cooling system, the heat dissipation fan blows air toward the heat sink, and the heat is taken away through the heat sink.

[0046] Furthermore, in some embodiments of the present invention, a heat-conducting layer is disposed on the surface of the battery box 100 to be tested, so as to verify the effect of the heat-conducting layer in improving the heat dissipation capacity of the battery box 100 to be tested.

[0047] Furthermore, in some embodiments of the present invention, a second temperature sensor is provided on the tabs of the real battery cell 110 and the simulated battery cell 120. The first temperature sensor can detect the temperature inside the battery cell, and the second temperature sensor can detect the temperature outside the battery cell, so that the detected temperature is more comprehensive.

[0048] According to the battery box thermal management evaluation system of the embodiment of the utility model, by using simulated battery cells 120 with properties close to those of real battery cells 110, the effects of different thermal management strategies (air cooling, liquid cooling and immersion cooling) in actual applications can be accurately evaluated; by real-time temperature monitoring, actual temperature data support can be provided for the design of the thermal management system of the battery box, which helps to optimize and improve the thermal management solution; by using some simulated battery cells instead of real battery cells, the test cost is reduced while maintaining a high degree of simulation of the test; through optional electrolyte replacement, the heat conduction effect in different environments can be simulated, thereby enhancing the universality of the test results.

[0049] The above is a specific description of the preferred implementation of the utility model, but the utility model is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of the utility model.

Claims

1. A battery box thermal management evaluation system, characterized in that: include: A battery box to be tested, wherein the interior of the battery box to be tested includes at least one real battery cell and multiple simulated battery cells, and the at least one real battery cell and the multiple simulated battery cells are connected in series in a preset arrangement order; wherein each of the simulated battery cells includes a battery shell, the interior of the battery shell is filled with a simulated electrolyte, a first temperature sensor is arranged inside the real battery cell and the simulated battery cell, and a power resistor is connected between the positive and negative electrodes of each of the simulated battery cells; An air cooling system is arranged in the battery box to be tested; A liquid cooling system is arranged in the battery box to be tested; An immersion cooling system connected to the battery box to be tested; a control system, electrically connected to the first temperature sensor, the power resistor, the air cooling system, the liquid cooling system and the immersion cooling system respectively; An atomizing nozzle is arranged in the battery box to be tested, and the atomizing nozzle is connected to one end of a water pump, and the other end of the water pump is connected to a liquid storage tank. A first solenoid valve is arranged between the liquid storage tank and the water pump, and a cooling medium is stored in the liquid storage tank. The first solenoid valve and the water pump are both electrically connected to the control system.

2. The battery box thermal management evaluation system according to claim 1, characterized in that: A heating element is provided at the bottom of the real battery cell, and the heating element is electrically connected to the control system.

3. The battery box thermal management evaluation system according to claim 1, characterized in that: The liquid cooling system includes a first liquid cooling plate, a second liquid cooling plate and a phase change material. The simulated battery cell and the real battery cell are embedded in the phase change material. The first liquid cooling plate is arranged on the top of the phase change material, and the second liquid cooling plate is arranged on the bottom of the phase change material. The first liquid cooling plate is provided with a first water inlet and a first water outlet which are interconnected, and the second liquid cooling plate is provided with a second water inlet and a second water outlet which are interconnected.

4. The battery box thermal management evaluation system according to claim 1, characterized in that: The immersion cooling system includes a cooling water tank and a circulation pump, wherein cooling water is stored in the cooling water tank, wherein a liquid outlet of the cooling water tank is connected to one end of the circulation pump, wherein the other end of the circulation pump is communicated with a liquid inlet of the battery box to be tested, wherein the liquid outlet of the battery box to be tested is communicated with the liquid inlet of the cooling water tank, wherein a second solenoid valve is arranged at the liquid inlet of the battery box to be tested, and a third solenoid valve is arranged at the liquid outlet of the battery box to be tested.

5. The battery box thermal management evaluation system according to claim 4, characterized in that: A temperature regulating device is arranged in the cooling water tank.

6. The battery box thermal management evaluation system according to claim 1, characterized in that: The battery box to be tested is provided with a pressure relief port, and the pressure relief port is provided with a pressure relief valve.

7. The battery box thermal management evaluation system according to claim 1, characterized in that: An air inlet is provided on one side of the battery box to be tested, and an air outlet is provided on the other side of the battery box to be tested. The air cooling system includes a cooling fan and a heat sink. The cooling fan is provided at the air inlet, and the heat sink is connected to the simulated battery cell and the real battery cell.

8. The battery box thermal management evaluation system according to claim 1, characterized in that: A heat-conducting layer is provided on the surface of the battery box to be tested.

9. The battery box thermal management evaluation system according to claim 1, characterized in that: The tabs of the real battery cell and the simulated battery cell are provided with a second temperature sensor.

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