Battery performance testing device and battery performance testing method

Abstract

A battery performance testing device and a battery performance testing method, relating to the field of battery testing. The battery performance testing device comprises: a case (1) in which at least one clamp (5100) for fixing a battery (5200) under test is mounted; a liquid storage tank (4) in which a non-conductive cooling liquid is stored, the case (1) being provided with liquid inlets (11) and liquid outlets (12), an outlet of the liquid storage tank (4) being communicated with the liquid inlets (11), and the liquid outlets (12) being communicated with an inlet of the liquid storage tank (4); and a controller (2), a temperature adjusting unit (3), and a battery tester, wherein the battery tester is mounted outside the case (1) and used for being electrically connected to the battery (5200) under test, and the controller (2) is electrically connected to the temperature adjusting unit (3) so as to adjust the temperature of the cooling liquid.

Description

Battery performance testing device and battery performance testing method

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese Patent Application No. 202410862373.3, filed on June 28, 2024, and Chinese Patent Application No. 202411800256.0, filed on December 09, 2024, the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the field of battery testing, and in particular to a battery performance testing device and a battery performance testing method. BACKGROUND

[0004] In the battery research and development stage, performance testing of batteries before leaving the factory is a very important test link. The purpose of battery performance testing is to test the performance and cycle life of the battery by simulating various charging and discharging conditions of the battery in use. In the testing process, the test temperature is an important parameter affecting the battery test results, and the regulation accuracy of the test temperature directly affects the results of the test parameters such as the capacitance, internal resistance or cycle life of the battery. Therefore, accurate regulation of the temperature of the battery under test is of the utmost importance in the testing process.

[0005] In the conventional process of testing the performance of a battery, the battery under test is usually placed in an environmental chamber, which is provided with a fan. The fan is controlled by configuring parameters to cool and control the temperature of the battery under test, thereby simulating the cooling conditions in the actual use of the battery. This testing method is far from the actual use of the battery, and it is difficult to ensure the accuracy of the test.

[0006] SUMMARY

[0007] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a battery performance testing device that ensures the authenticity and accuracy of battery performance testing and improves the accuracy of battery performance testing parameters.

[0008] The present application further provides a battery performance testing method.

[0009] The battery performance testing device according to the application comprises: a box body, at least one clamp for fixing a battery to be tested is installed in the box body; a liquid storage tank, the liquid storage tank stores non-conductive cooling liquid, the box body has a liquid inlet and a liquid outlet, the outlet of the liquid storage tank is communicated with the liquid inlet, and the liquid outlet is communicated with the inlet of the liquid storage tank; a controller, a temperature adjusting unit, and a battery tester, the battery tester is installed outside the box body and is electrically connected with the battery to be tested; and the controller is electrically connected with the temperature adjusting unit to adjust the temperature of the cooling liquid.

[0010] The battery performance testing device according to the application can accurately simulate the normal temperature or cooling condition of the battery in the actual use process, effectively restores the thermal management condition of the battery in the use process, guarantees the authenticity and accuracy of the battery performance testing, and improves the precision of the battery performance testing parameters

[0011] In some examples of the application, the temperature adjusting unit comprises: a first temperature sensor, a heating element, and a cooling element, the heating element and the cooling element are both installed in the interior of the liquid storage tank, the first temperature sensor is fixed to the inner wall of the box body and is used for monitoring the temperature information of the cooling liquid in the box body or the temperature information of the battery to be tested, the first temperature sensor is electrically connected with the controller, and the controller is electrically connected with the heating element and the cooling element respectively, so as to control the working state of the heating element and the cooling element according to the temperature information.

[0012] In some examples of the application, the battery performance testing device further comprises: a flow field control device, a regulating valve, a liquid inlet pipeline, and a liquid outlet pipeline, the liquid inlet end of the liquid inlet pipeline is communicated with the outlet of the liquid storage tank, the liquid outlet end of the liquid inlet pipeline is communicated with the liquid inlet, the liquid inlet end of the liquid outlet pipeline is communicated with the liquid outlet, and the liquid outlet end of the liquid outlet pipeline is communicated with the inlet of the liquid storage tank, the flow field control device is arranged in the liquid outlet pipeline, the liquid inlet and the liquid outlet are both provided with the regulating valve, the controller is electrically connected with the flow field control device and the regulating valve respectively, and the controller is used for controlling the flow of the cooling liquid.

[0013] In some examples of the application, the battery performance testing device further comprises: a plurality of partitions, the partitions are fixed to the inner wall of the box body and divide the interior of the box body into a plurality of detection cavities, the plurality of detection cavities are not communicated with each other, the cavity wall of each detection cavity is provided with a liquid inlet and a liquid outlet, the liquid inlet of each detection cavity is communicated with the outlet of the liquid storage tank, and the liquid outlet of each detection cavity is communicated with the inlet of the liquid storage tank.

[0014] In some examples of the application, the clamp is installed in the interior of the box body in a liftable manner.

[0015] In some examples of the present application, the battery performance testing device further comprises a guide rail and a sliding block, the guide rail is fixed to the side wall of the box, the guide rail extends in the vertical direction, and the clamp is fixed to the sliding block, and the sliding block is movably arranged on the guide rail.

[0016] In some examples of the present application, the clamp comprises two clamping parts and a connecting piece, the two clamping parts are opposite and spaced apart in a first direction to form a clamping space between the two clamping parts for placing the battery to be tested, and the connecting piece is connected with the two clamping parts to fix the relative positions of the two clamping parts; at least one of the clamping parts is formed with a cooling liquid through hole penetrating through the corresponding clamping part in the first direction, and the cooling liquid is arranged opposite to the clamping space in the first direction.

[0017] In some examples of the present application, the two clamping parts are each formed with a plurality of mounting holes, the mounting holes on one of the clamping parts and the mounting holes on the other clamping part are one-to-one corresponding, and the connecting piece is arranged in the corresponding two mounting holes to fix the relative positions of the two clamping parts.

[0018] In some examples of the present application, the clamp further comprises two heat-conducting plates, the two heat-conducting plates are located between the two clamping parts, the two heat-conducting plates are opposite and spaced apart in the first direction, the two heat-conducting plates are respectively in abutment with the two clamping parts, the heat-conducting plate cover is arranged on the cooling medium through hole of the corresponding clamping part, and the heat-conducting plate is used to abut against the battery device.

[0019] According to the battery performance testing method provided by the present application, the battery tester is electrically connected with the battery to be tested, the clamp clamps the battery to be tested, the liquid storage tank introduces cooling liquid into the box, the battery to be tested is at least partially immersed in the cooling liquid in the box, the temperature of the cooling liquid is adjusted by the temperature adjusting unit, and the battery to be tested is tested by the battery tester.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] FIG. 1 is a schematic diagram of the overall structure of a battery performance testing device according to the present application;

[0022] FIG. 2 is a schematic diagram of the structure of a box according to the present application;

[0023] FIG. 3 is a schematic diagram of the connection of a liquid storage tank and a temperature adjusting unit according to the present application;

[0024] Fig. 4 is an assembly view of a clamp and a battery to be tested according to a first embodiment provided by the present application;

[0025] Fig. 5 is an assembly view of a clamp and a battery to be tested according to a second embodiment provided by the present application;

[0026] Fig. 6 is an exploded view of a clamping part and a heat-conducting plate of the clamp according to the first embodiment provided by the present application;

[0027] Fig. 7 is a structural schematic view of the clamping part of the clamp according to the first embodiment provided by the present application;

[0028] Fig. 8 is a flow chart of a battery performance testing method provided by the present application.

[0029] Fig. 8 is a flow chart of a battery performance testing method provided by the present application. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be interpreted in a limiting manner.

[0031] The battery performance testing device and the battery performance testing method provided by the embodiments of the present application are described in detail below in combination with Figs. 1-8 through specific embodiments and application scenarios.

[0032] The present application provides a battery performance testing device, which comprises a box body 1, a controller 2, a temperature adjusting unit 3, a battery tester, a flow field control device and a liquid storage tank 4. The liquid storage tank 4 stores non-conductive cooling liquid. The box body 1 has a liquid inlet 11 and a liquid outlet 12. The outlet of the liquid storage tank 4 and the liquid inlet 11 are communicated, and the liquid outlet 12 and the inlet of the liquid storage tank 4 are communicated. The box body 1 is provided with at least one clamp 5100 for fixing a battery to be tested 5200. The battery tester is installed outside the box body 1 and is used for electrical connection with the battery to be tested 5200. The controller 2 and the temperature adjusting unit 3 are electrically connected to adjust the temperature of the cooling liquid.

[0033] It can be understood that batteries are divided into many types, such as power batteries or thermal energy storage batteries, etc. In the process of use, in order to realize the cooling of the battery, generally, the power battery usually adopts the water-cooled plate for cooling, and the thermal energy storage battery usually adopts the immersion cooling.

[0034] The application can be applied to various types of batteries, such as power batteries or thermal energy storage batteries, etc.

[0035] Specifically, the box body 1 has a liquid cavity. The liquid inlet 11 and the liquid outlet 12 are respectively communicated with the liquid cavity. The liquid storage tank 4 contains cooling liquid. As shown in FIG. 1 and FIG. 2, the outlet of the liquid storage tank 4 is communicated with the liquid inlet 11, and the liquid outlet 12 is communicated with the inlet of the liquid storage tank 4, so as to realize the circulating flow of the cooling liquid between the liquid storage tank 4 and the box body 1. Wherein, the shape of the liquid cavity can be rectangular, circular or other irregular shape, which is not limited in the application.

[0036] The cooling liquid is an insulating non-conductive liquid. The cooling liquid has good fluidity, poor volatility and is non-toxic. Optionally, the cooling liquid can be silicone oil or halogenated hydrocarbon, etc.

[0037] The inner wall of the box body 1 is provided with at least one clamp 5100, which is used for clamping the battery to be tested 5200, so that the battery to be tested 5200 can be fully or semi-submerged in the cooling liquid according to the set requirements. Wherein, the clamp 5100 can be provided as multiple. Multiple clamps 5100 are arranged at intervals along the length direction of the box body 1. Each clamp 5100 is used for clamping one battery to be tested 5200. Thus, the user can simultaneously test the performance of multiple batteries to be tested 5200 through the battery performance testing device provided by the application, thereby improving the testing efficiency.

[0038] Optionally, the number of clamps 5100 can be three, five or six, etc., which is not limited in the application.

[0039] Further, as shown in FIG. 1, the battery performance testing device provided by the present application further comprises a controller 2. The controller 2 can be installed on the outer wall of the liquid storage tank 4. The controller 2 is electrically connected with the temperature adjusting unit 3 to control the working state of the temperature adjusting unit 3. The temperature adjusting unit 3 can be arranged on the liquid storage tank 4 or on the pipeline between the outlet of the liquid storage tank 4 and the liquid inlet 11 to adjust the temperature of the cooling liquid, so as to simulate the different temperature conditions that the battery 5200 to be tested may face in actual use, and increase the applicability of the whole device. The battery performance testing device can further comprise a flow field control device. The controller 2 is electrically connected with the flow field control device to control the flow of the cooling liquid, so as to simulate the flow of the cooling liquid in actual use of the battery 5200 to be tested.

[0040] The temperature adjusting unit 3 can not only be used to cool the cooling liquid, but also can be used to adjust the temperature of the cooling liquid to a high temperature. For example, when the temperature of the cooling liquid is low, the purpose is to test the performance of the battery 5200 to be tested when the cooling effect of the battery 5200 to be tested is good, that is, the performance of the water cooling plate is good. When the temperature of the cooling liquid is high, the purpose is to test the performance of the battery 5200 to be tested when the water cooling of the water cooling plate fails in actual use of the battery 5200 to be tested.

[0041] As some embodiments of the present application, the flow field control device is used to drive the cooling liquid to flow at a preset flow rate and direction. By controlling the flow state of the cooling liquid, the flow field control device can ensure the uniformity and stability of the temperature distribution of the battery 5200 to be tested in the testing or working process. It can also accelerate the heating or cooling process of the battery 5200 to be tested. When it is necessary to quickly increase or decrease the temperature of the battery, by increasing or decreasing the flow rate of the cooling liquid, the heat transfer and exchange can be accelerated, so that the temperature can be adjusted more quickly.

[0042] Specifically, under the premise that the thermal management conditions of the battery 5200 to be tested meet the requirements, the battery tester is electrically connected with the positive electrode and the negative electrode of the battery 5200 to be tested respectively to test the performance parameters of the battery 5200 to be tested. The battery performance testing device further comprises a test wire. As shown in FIG. 1, the box body 1 is provided with at least one wire port 17. One end of the test wire is electrically connected with the battery tester, and the other end is arranged in the wire port 17 and is electrically connected with the positive electrode and the negative electrode of the battery 5200 to be tested respectively.

[0043] The application provides a battery performance testing device. A non-conductive cooling liquid is stored in a liquid storage tank 4. An outlet of the liquid storage tank 4 is communicated with a liquid inlet 11 of a box body, and a liquid outlet 12 of the box body is communicated with an inlet of the liquid storage tank 4, so that the cooling liquid is circulated into the box body 1 through the liquid storage tank 4. At least one clamp 5100 for fixing a battery to be tested 5200 is installed in the box body 1, so that at least a part of the battery to be tested 5200 is immersed in the cooling liquid in the box body 1. A controller 2 and a temperature adjusting unit 3 are electrically connected to adjust the temperature of the cooling liquid. The temperature of the battery to be tested 5200 is rapidly adjusted through the flowing cooling liquid, and the efficiency and accuracy of temperature adjustment are improved. The battery testing device and the battery to be tested 5200 are electrically connected to test the performance parameters of the battery to be tested 5200 at different temperatures. In this way, the normal temperature or cooling condition of the battery to be tested 5200 in the actual use process can be accurately simulated, the thermal management condition of the battery to be tested 5200 in the use process is effectively restored, and the authenticity and accuracy of the test result are ensured. Meanwhile, the temperature of the cooling liquid is increased to simulate the cooling failure of the battery to be tested 5200 in the actual use process, so that the loss degree of the battery to be tested 5200 is tested, and the applicability and universality of the battery performance testing device are improved.

[0044] Furthermore, as some embodiments of the application, the controller 2 and a flow field control device are electrically connected to control the flow of the cooling liquid, so as to simulate the flow of the cooling liquid in the actual use process of the battery to be tested 5200. The authenticity and accuracy of the test result are further ensured.

[0045] In some embodiments, the temperature adjusting unit 3 comprises a first temperature sensor, a heating element 31 and a cooling element 32. As shown in FIG. 3, the heating element 31 and the cooling element 32 are both installed in the inside of the liquid storage tank 4, and the first temperature sensor is fixed to the inner wall of the box body 1 and used for monitoring the temperature information of the cooling liquid in the box body 1 or the temperature information of the battery to be tested 5200. The first temperature sensor is electrically connected to the controller 2, and the controller 2 is electrically connected to the heating element 31 and the cooling element 32 respectively, so as to control the working states of the heating element 31 and the cooling element 32 according to the temperature information.

[0046] Taking the first temperature sensor for monitoring the temperature information of the cooling liquid in the box body 1 as an example, the first temperature sensor can be a thermocouple. It can be understood that the first temperature sensor is installed on the groove wall of the liquid cavity and used for monitoring the temperature of the cooling liquid in the liquid cavity in real time. The first temperature sensor is electrically connected to the controller 2, and the controller 2 is electrically connected to the heating element 31 and the cooling element 32 respectively. The controller 2 can determine whether the current temperature of the cooling liquid is within the set temperature range according to the temperature information monitored by the first temperature sensor.

[0047] When the temperature of the cooling liquid is lower than the set temperature, the controller 2 can immediately control the heating element 31 to operate, and heat the cooling liquid to the set temperature through the heating element 31. Optionally, the heating element 31 can be an electric heating tube or a heating wire, etc. When installed, the heating element 31 is inserted into the cooling liquid in the liquid storage tank 4.

[0048] When the temperature of the cooling liquid is higher than the set temperature, the controller 2 can immediately control the cooling element 32 to operate, and cool the cooling liquid to the set temperature through the cooling element 32. Optionally, the cooling element 32 can be a condenser tube, a heat exchange tube or a cooling water tube, etc. When installed, the cooling element 32 is inserted into the cooling liquid in the liquid storage tank 4.

[0049] In other embodiments, the heating element 31 and the cooling element 32 can be temperature control devices integrated with heating and cooling functions. Optionally, the temperature control device can be a heat exchanger.

[0050] As some embodiments of the present application, the temperature adjusting unit 3 further comprises a compressor and a radiator, the compressor, the radiator and the cooling element 32 are connected as a circulation loop, and the compressor provides power to make the refrigerant flow between the cooling element 32, the compressor and the radiator. When the refrigerant flows through the cooling element 32, it absorbs the heat of the cooling liquid to cool the cooling liquid, and then the refrigerant flows through the radiator to transfer the absorbed heat to the external environment, thereby releasing the heat. After that, the refrigerant returns to the cooling element 32 again to continue the next round of circulation.

[0051] Further, in some embodiments, as shown in FIG. 1, the battery performance testing device further comprises a flow field control device, an adjusting valve 5, an inlet pipe 6 and an outlet pipe 7. The inlet end of the inlet pipe 6 and the outlet of the liquid storage tank 4 are in communication, the outlet end of the inlet pipe 6 and the inlet port 11 are in communication, the inlet end of the outlet pipe 7 and the outlet port 12 are in communication, and the outlet end of the outlet pipe 7 and the inlet of the liquid storage tank 4 are in communication. The flow field control device is arranged in the outlet pipe 7, the adjusting valve 5 is arranged in the inlet port 11 and the outlet port 12, and the controller 2 is electrically connected with the flow field control device and the adjusting valve 5 respectively, and the controller 2 is used to control the flow of the cooling liquid.

[0052] It can be understood that the two ends of the inlet pipe 6 are respectively in communication with the outlet of the liquid storage tank 4 and the inlet port 11, and the two ends of the outlet pipe 7 are respectively in communication with the inlet of the liquid storage tank 4. The flow field control device can be arranged in the outlet pipe 7, and is used to circulate the cooling liquid in the liquid storage tank 4 to the liquid cavity of the box body 1, so as to ensure the flowability of the cooling liquid in the liquid cavity. The circulation of the cooling liquid in the liquid storage tank 4 and the liquid cavity can be used to accurately control the temperature of the cooling liquid.

[0053] Specifically, the liquid inlet 11 and the liquid outlet 12 are each provided with an adjusting valve 5. Optionally, the adjusting valve 5 can be a solenoid valve or a throttle valve. The adjusting valve 5 and the flow field control device are each electrically connected to the controller 2. The controller 2 can adjust the flow rate and pressure of the cooling liquid in the liquid cavity by controlling the working states of the flow field control device and the adjusting valve 5, thereby simulating the situation of water-cooled plate rupture or deformation in the actual use of the battery.

[0054] For example, the flow field control device can be configured as a circulating pump. The user can control the pump pressure of the flow field control device to sharply drop through the controller 2 according to the actual test requirements, so as to simulate the safety test of the water-cooled plate deformation or sudden external impact of the battery in the actual use.

[0055] As some embodiments of the present application, a second temperature sensor is further included. The second temperature sensor can collect the temperature of the battery under test 5200 in real time and take the temperature as a feedback signal. The controller 2 controls the flow field control device to drive the cooling liquid to flow at a preset flow rate and direction according to the temperature of the battery under test 5200 collected by the second temperature sensor, so as to realize the control of heat transfer and distribution. For example, when the temperature of the battery under test 5200 is low, the temperature needs to be raised as soon as possible. The temperature adjusting unit 3 heats the cooling liquid, and the controller 2 increases the rotating speed of the flow field control device to increase the flow rate of the cooling liquid, so as to accelerate the speed of heat transfer from the cooling liquid to the battery under test 5200. Further, the flow field control device has the functions of speed regulation and direction control, and can change the rotating speed and direction as needed, or adjust the forward and reverse rotation, so as to adjust the flow field of the cooling liquid according to the test and temperature adjustment requirements of the battery under test 5200.

[0056] Further, since the cooling liquid is an insulating liquid, the flow field control device can be, but is not limited to, an adjustable speed device such as an alternating / direct current centrifugal pump, an axial flow pump, a gear pump, etc. which does not need insulation protection.

[0057] As some embodiments of the present application, the flow field control device is arranged on each side of the battery under test 5200. The main purpose is to ensure that the cooling liquid forms more uniform and efficient flow around the battery under test 5200. When the battery under test 5200 is subjected to high-rate charging and discharging, a large amount of heat will be generated, which needs to be removed in time to keep the battery under test 5200 operating within a safe temperature range. By arranging the flow field control device on each side of the battery under test 5200, the cooling liquid can form a more complex flow pattern (such as turbulent flow or laminar flow) around the battery under test 5200, so as to more effectively absorb and remove the heat generated by the battery under test 5200. In addition, this design also helps to more uniformly transfer the heat to the battery under test 5200, which is helpful for the battery under test 5200 to quickly warm up.

[0058] As some embodiments of the present application, the heating element 31 is provided with flow field control devices on both sides. The flow field control devices on both sides of the heating element 31 can also bring significant advantages. The heat generated by the heating element 31 needs to be quickly and uniformly transferred to the cooling liquid, so as to further transfer the heat to the battery 5200 to be tested. By respectively providing flow field control devices on both sides of the heating element 31, it can be ensured that the cooling liquid forms an efficient flow around the heating element 31, thereby accelerating the heat transfer process. This design not only improves the efficiency of heat transfer, but also helps to reduce the energy consumption and response time of the heating element 31. Thus, the temperature regulation of the battery 5200 to be tested is realized.

[0059] As some embodiments of the present application, the controller 2 is used to control the temperature regulation unit 3, the flow field control device, and the battery tester.

[0060] Specifically, the controller 2 can receive a temperature signal fed back by the first temperature sensor, which reflects the current temperature state of the battery 5200 to be tested. According to a preset temperature threshold or temperature regulation strategy, the controller 2 will issue an instruction to the temperature regulation unit 3, requiring it to start the heating or cooling function, and the controller 2 will issue an instruction to the flow field control device to control the power and other working parameters of the flow field control device. In addition, the controller 2 can control the battery tester to test the battery 5200 to be tested.

[0061] For example, while the battery 5200 to be tested is being temperature-regulated, the controller 2 will also continuously monitor the current temperature of the battery 5200 to be tested. When the current temperature of the battery 5200 to be tested reaches a condition suitable for charging and discharging tests (for example, when the temperature is stable and within a safe range), the controller 2 will issue an instruction to the battery tester. These instructions can include starting a charging test, a discharging test, setting a specific charging and discharging current or voltage, etc., to evaluate the performance of the battery 5200 to be tested under different temperature conditions.

[0062] Further, the controller 2 can be, but is not limited to, an industrial control machine, a tablet computer or other computer equipment.

[0063] In some embodiments, as shown in FIG. 2, the battery performance test device further comprises a plurality of partitions 13. The partitions 13 are fixed to the inner wall of the box 1, and divide the interior of the box 1 into a plurality of detection cavities 14.

[0064] It can be understood that the plurality of partitions 13 are fixed to the inner wall of the box 1. The plurality of partitions 13 are arranged at intervals along the length direction of the box 1, so as to divide the liquid cavity into a plurality of detection cavities 14.

[0065] Optionally, the plurality of detection cavities 14 are not connected with each other. The cavity wall of each detection cavity 14 is provided with an inlet 11 and an outlet 12. The inlet 11 of each detection cavity 14 is connected with the outlet of the liquid storage tank 4, and the outlet 12 of each detection cavity 14 is connected with the inlet of the liquid storage tank 4. Similarly, each inlet 11 and outlet 12 is provided with a regulating valve 5. Each inlet 11 is connected with the outlet of the liquid storage tank 4 through an inlet pipe 6. Each outlet 12 is connected with the inlet of the liquid storage tank 4 through an outlet pipe 7. The outlet pipe 7 is provided with a flow field control device.

[0066] Alternatively, the outlet of the liquid storage tank 4 is connected with a main delivery pipe. The main delivery pipe is provided with a plurality of branch pipes at the end away from the outlet of the liquid storage tank 4. The plurality of branch pipes are connected with the plurality of inlets 11 one by one. Each branch pipe is provided with a throttle valve. Further, the inlet of the liquid storage tank 4 is connected with a main return pipe. The flow field control device is arranged on the main return pipe. The main return pipe is provided with a plurality of return branch pipes at the end away from the inlet of the liquid storage tank 4. The plurality of return branch pipes are connected with the plurality of outlets 12 one by one. Each return branch pipe is provided with an electromagnetic valve.

[0067] By fixing a plurality of partitions 13 in the box body 1, the inside of the box body 1 is divided into a plurality of detection cavities 14. Each detection cavity 14 is independently connected with the inside of the liquid storage tank 4, so that the user can control the flow of the cooling liquid in each detection cavity 14 independently. The plurality of to-be-tested batteries 5200 are one by one corresponding to the plurality of detection cavities 14, which facilitates batch management of the to-be-tested batteries 5200 during the test. At the same time, when the number of to-be-tested batteries 5200 is small, the cooling liquid can be injected into a single or a small number of detection cavities 14, so as to save energy consumption and avoid waste of resources.

[0068] As shown in FIG. 2, the inlet 11 and the outlet 12 are arranged on the opposite side walls of the box body 1. And / or, the inlet 11 is located below the outlet 12, so that the cooling liquid is introduced from the bottom of the liquid cavity and then flows back to the liquid storage tank 4 from the outlet 12 at the top of the liquid cavity. This helps to quickly promote the temperature of the cooling liquid in the liquid cavity to be quickly adjusted to the set temperature, and ensures the uniformity of the temperature of the cooling liquid in the liquid cavity.

[0069] Further, the battery performance test device further comprises a reinforcing structure. The box body 1 comprises a body 15 and a top cover 16. The body 15 is provided with a groove, and the top cover 16 is detachably arranged on the groove. The reinforcing structure is arranged in close contact with the groove wall of the groove.

[0070] It can be understood that the reinforcing structure can be a steel mesh. The steel mesh is arranged in close contact with the cavity wall of the liquid cavity, so as to ensure the strength of the entire box body 1. The top cover 16 is detachably arranged on the body 15, so as to facilitate opening of the top cover 16 to fix the to-be-tested batteries 5200 and other components.

[0071] The top cover 16 and the body 15 can be connected by bolts or pressing pliers. Alternatively, one side of the top cover 16 and one side of the body 15 can be hingedly connected by a pin shaft, so that the top cover 16 is rotatably mounted on the body 15, facilitating the opening and closing of the top cover 16.

[0072] In some embodiments, the clamp 5100 is liftably mounted in the interior of the box 1.

[0073] It can be understood that, during the test, the battery under test 5200 is fixed by the clamp 5100, so that the battery under test 5200 remains in a fixed posture, simulating the condition that the battery under test 5200 is fixed in a power system or a device such as a car during actual use. In order to adapt to various cooling modes of the battery under test 5200 during actual use, the clamp 5100 is liftably arranged in the box 1, thereby ensuring the controllability of the volume of the battery under test 5200 immersed in the cooling liquid.

[0074] For example, when it is required to immerse the battery under test 5200 in the cooling liquid for testing, the clamp 5100 is moved to a deeper position in the box 1, and then the battery under test 5200 is clamped. When it is required to immerse half of the battery under test 5200 in the cooling liquid, the clamp 5100 only needs to be controlled to move upward to a shallower position in the box 1. The user can control the immersion degree of the battery under test 5200 by controlling the lifting height of the clamp 5100 according to actual needs.

[0075] Specifically, in some embodiments, the battery performance testing device further comprises a guide rail and a sliding block. The guide rail is fixed to the side wall of the box 1, and extends in the vertical direction. The clamp 5100 is fixed to the sliding block, and the sliding block is movably arranged in the guide rail.

[0076] It can be understood that the guide rail is mounted on the side wall of the box 1 in the vertical direction. The size of the sliding block is adapted to the guide rail. The sliding block is movably arranged in the guide rail. The clamp 5100 is fixed to the sliding block, so that the clamp 5100 can be lifted together with the sliding block.

[0077] Preferably, the box 1 is transparent. The transparent box 1 can facilitate observation of the entire test process of the battery under test 5200 in the box 1, and facilitate observation of the volume of the cooling liquid in the box 1, thereby improving the convenience of the test process.

[0078] Optionally, the material of the box 1 can be organic glass, acrylic or high-strength tempered glass, etc.

[0079] In some embodiments of the present application, as shown in FIGS. 4-7, the clamp 5100 according to embodiments of the present application comprises two clamping portions 51 and a connecting member 52, the two clamping portions 51 are opposite and spaced apart along a first direction to form a clamping space 511 between the two clamping portions 51 for placing a battery 5200 to be tested, and the connecting member 52 is connected with the two clamping portions 51 to fix the relative positions of the two clamping portions 51; wherein at least one clamping portion 51 is formed with a cooling liquid through hole 512 penetrating through the corresponding clamping portion 51 along the first direction, and the cooling liquid through hole 512 is arranged opposite to the clamping space 511 along the first direction.

[0080] In some embodiments of the present application, as shown in FIGS. 4-7, the clamp 5100 according to embodiments of the present application comprises two clamping portions 51 and a connecting member 52, the two clamping portions 51 are opposite and spaced apart along a first direction to form a clamping space 511 between the two clamping portions 51 for placing a battery 5200 to be tested, and the connecting member 52 is connected with the two clamping portions 51 to fix the relative positions of the two clamping portions 51; wherein at least one clamping portion 51 is formed with a cooling liquid through hole 512 penetrating through the corresponding clamping portion 51 along the first direction, and the cooling liquid through hole 512 is arranged opposite to the clamping space 511 along the first direction.

[0081] At least one clamping portion 51 can be formed with a cooling liquid through hole 512, for example, one clamping portion 51 is formed with a cooling liquid through hole 512, or both clamping portions 51 are formed with a cooling liquid through hole 512, and the present application takes both clamping portions 51 formed with a cooling liquid through hole 512 as an example for illustration, which can make the arrangement of the cooling liquid through hole 512 reasonable and conducive to increasing the heat exchange area of the battery 5200 to be tested and the cooling liquid.

[0082] It can be understood that by clamping the battery 5200 to be tested by the clamp 5100, the clamp 5100 may block the battery 5200 to be tested, thereby affecting the contact area of the battery 5200 to be tested and the cooling liquid, and thus affecting the test accuracy, and by forming the clamping portion 51 with the cooling liquid through hole 512, the heat exchange area of the battery 5200 to be tested and the cooling liquid can be increased, which is conducive to accurate testing.

[0083] In the first direction, the cooling liquid through hole 512 penetrates the corresponding clamping part 51, and further, in the first direction, the cooling liquid through hole 512 is arranged opposite to the clamping space 511. When the cooling liquid flows into the cooling liquid through hole 512, the cooling liquid can directly contact the battery under test 5200 clamped in the clamping space 511 through the cooling liquid through hole 512, so as to make the cooling liquid and the battery under test 5200 exchange heat. By forming the cooling liquid through hole 512 in the two clamping parts 51, the heat exchange area of the battery under test 5200 and the cooling liquid can be increased, the heat dissipation effect of the battery under test 5200 can be improved, and the test accuracy of the battery under test 5200 can be increased. Further, the risk of the battery under test 5200 swelling and deforming due to temperature rise of the battery under test 5200 can be further reduced.

[0084] Specifically, the battery under test 5200 is arranged in the clamping space 511 between the two clamping parts 51, and the connecting piece 52 is connected with the two clamping parts 51, so that the relative positions of the two clamping parts 51 are fixed, and the clamping force of the two clamping parts 51 can be maintained. By clamping the battery under test 5200 with the two clamping parts 51, the risk of the battery under test 5200 swelling and deforming due to temperature rise of the battery under test 5200 can be reduced. Since the battery under test 5200 is arranged in the clamping space 511, and the cooling liquid through hole 512 is arranged opposite to the clamping space 511 in the first direction, when the cooling liquid flows into the cooling liquid through hole 512, the cooling liquid can directly contact the battery under test 5200 clamped in the clamping space 511 through the cooling liquid through hole 512, so as to make the cooling liquid and the battery under test 5200 exchange heat, improve the heat exchange effect of the battery under test 5200, and further improve the test accuracy of the battery under test 5200.

[0085] It can be understood that during the detection of the battery under test 5200, if the first temperature sensor is needed to detect the temperature of the battery under test 5200, by making the first temperature sensor pass through the cooling liquid through hole 512, the detection end of the first temperature sensor can directly contact the surface of the battery under test 5200, so as to increase the accuracy of temperature detection of the battery under test 5200.

[0086] Therefore, by forming the cooling liquid through hole 512 in at least one clamping part 51, and arranging the cooling liquid through hole 512 opposite to the clamping space 511 in the first direction, the heat exchange area of the battery under test 5200 and the cooling liquid can be increased while the clamping force of the clamping part 51 is maintained, the heat dissipation effect of the battery under test 5200 can be improved, and the test accuracy of the battery under test 5200 can be increased.

[0087] In some embodiments of the present application, as shown in FIGS. 4 and 5, the cooling liquid through hole 512 is a plurality of.

[0088] The cooling liquid through hole 512 is multiple, for example, two, ten, twenty, thirty or more, and is used to flow the cooling liquid. The multiple cooling liquid through holes 512 can further increase the heat exchange area between the battery under test 5200 and the cooling liquid, improve the heat dissipation effect of the battery under test 5200, and increase the test accuracy of the battery under test 5200. In addition, the risk of the battery under test 5200 swelling and deforming due to temperature rise can be further reduced.

[0089] Further, by arranging multiple cooling liquid through holes 512 at different positions of the corresponding clamping part 51, the cooling liquid can exchange heat with different positions of the battery under test 5200, so that the temperatures of different positions of the battery under test 5200 are consistent or tend to be consistent, which is beneficial to reduce or even eliminate the temperature gradient of the battery under test 5200, and reduce the harmful reactions such as uneven current distribution and polarization caused by temperature difference in the battery under test 5200.

[0090] In some embodiments of the present application, as shown in FIGS. 4-5, the cooling liquid through hole 512 is a strip-shaped hole 513 or a circular hole 514.

[0091] As some embodiments of the present application, as shown in FIG. 5, the cooling liquid through hole 512 is a strip-shaped hole 513. As some embodiments of the present application, as shown in FIG. 4, the cooling liquid through hole 512 is a circular hole 514. The strip-shaped hole 513 can increase the heat exchange area between the battery under test 5200 and the cooling liquid without affecting the clamping force of the clamping part 51 as much as possible, and the strip-shaped hole 513 is convenient for the cooling liquid to pass through, which can improve the heat dissipation effect of the battery under test 5200.

[0092] Due to the structural characteristics of the circular hole 514, the cooling liquid through hole 512 configured as the circular hole 514 can make the clamping part 51 have a larger porosity, and increase the heat exchange area between the battery under test 5200 and the cooling liquid. The circular hole 514 also has better flow symmetry, which helps to reduce the formation of cooling liquid flow separation and vortex, thereby improving the flow efficiency and heat exchange performance of the cooling liquid, increasing the convective heat transfer coefficient, and being beneficial to further increasing the heat exchange efficiency between the battery under test 5200 and the cooling liquid.

[0093] The strip-shaped hole 513 or the circular hole 514 can also penetrate the detection end of the first temperature sensor, such as a sampling line, so that the first temperature sensor can real-time capture the temperature information of the surface of the battery under test 5200, reduce the risk of the detection end being affected by the temperature of other test equipment, and further increase the test accuracy of the battery under test 5200.

[0094] In some embodiments of the present application, as shown in FIG. 5, the cooling liquid through holes 512 are strip-shaped holes 513, and a plurality of cooling liquid through holes 512 are parallel to each other.

[0095] In some embodiments of the present application, as shown in FIG. 5, the cooling liquid through holes 512 are strip-shaped holes 513, and a plurality of cooling liquid through holes 512 are parallel to each other.

[0096] In some embodiments of the present application, as shown in FIG. 4 and FIG. 5, both clamping parts 51 are formed with a plurality of mounting holes 515, and the mounting holes 515 on one clamping part 51 and the mounting holes 515 on the other clamping part 51 are one-to-one corresponding, and the connecting piece 52 is arranged in the corresponding two mounting holes 515 to fix the relative position of the two clamping parts 51.

[0097] In some embodiments of the present application, as shown in FIG. 4 and FIG. 5, both clamping parts 51 are formed with a plurality of mounting holes 515, and the mounting holes 515 on one clamping part 51 and the mounting holes 515 on the other clamping part 51 are one-to-one corresponding, and the connecting piece 52 is arranged in the corresponding two mounting holes 515 to fix the relative position of the two clamping parts 51.

[0098] In some embodiments of the present application, as shown in FIG. 4 and FIG. 5, both clamping parts 51 are formed with a plurality of mounting holes 515, and the mounting holes 515 on one clamping part 51 and the mounting holes 515 on the other clamping part 51 are one-to-one corresponding, and the connecting piece 52 is arranged in the corresponding two mounting holes 515 to fix the relative position of the two clamping parts 51.

[0099] By arranging multiple mounting holes 515 on each clamping part 51, the heat exchange area between the cooling liquid and the battery 5200 under test can be further increased, and the two clamping parts 51 can be adapted to batteries 5200 under test of different sizes. By selecting appropriate mounting holes 515 according to the size of the battery 5200 under test, and by inserting the connecting piece 52 into the corresponding mounting holes 515 at appropriate positions, the two clamping parts 51 can maintain appropriate clamping force, thereby stably fixing the battery 5200 under test of different sizes at appropriate positions in the clamping space 511. This is beneficial to increase the versatility of the clamp 5100, reduce the number of a pair of special clamps 5100, and thereby reduce the production cost of the clamp 5100 and the testing cost of the battery 5200 under test. In addition, this can improve the testing efficiency of the battery 5200 under test and reduce the testing difficulty of the battery 5200 under test.

[0100] In some embodiments of the present application, as shown in FIG. 5, the multiple mounting holes 515 on each clamping part 51 form multiple rows of mounting hole rows 5151. The multiple rows of mounting hole rows 5151 on each clamping part 51 are arranged along a second direction. The multiple mounting holes 515 in each row of mounting hole rows 5151 are arranged along a third direction. Cooling liquid through holes 512 are formed between adjacent two rows of mounting hole rows 5151 in the multiple rows of mounting hole rows 5151. The first direction, the second direction, and the third direction are perpendicular to each other.

[0101] In some embodiments of the present application, as shown in FIG. 5, the multiple mounting holes 515 on each clamping part 51 form multiple rows of mounting hole rows 5151. The multiple rows of mounting hole rows 5151 on each clamping part 51 are arranged along a second direction. The multiple mounting holes 515 in each row of mounting hole rows 5151 are arranged along a third direction. Cooling liquid through holes 512 are formed between adjacent two rows of mounting hole rows 5151 in the multiple rows of mounting hole rows 5151. The first direction, the second direction, and the third direction are perpendicular to each other.

[0102] Cooling liquid through holes 512 are formed between adjacent two rows of mounting hole rows 5151 in the multiple rows of mounting hole rows 5151, so that the mounting hole rows 5151 are arranged near both ends along the second direction. When the battery 5200 under test is assembled in the clamping space 511, the battery 5200 under test can be arranged corresponding to the cooling liquid through holes 512, and the connecting pieces 52 are arranged on both sides of the battery 5200 under test along the second direction. This is beneficial to improve the stability of the battery 5200 under test assembled in the clamp 5100.

[0103] The first direction is the X direction in FIG. 5, the second direction is the Y direction in FIG. 5, and the third direction is the Z direction in FIG. 5. The first direction, the second direction, and the third direction are perpendicular to each other, that is, the X direction, the Y direction, and the Z direction are perpendicular to each other.

[0104] In some embodiments of the present application, as shown in FIGS. 4 and 6, the clamp 5100 can further include two heat-conducting plates 53 located between the two clamping portions 51, the two heat-conducting plates 53 being opposite and spaced apart along the first direction, and the two heat-conducting plates 53 being in abutment with the two clamping portions 51, respectively. The heat-conducting plate 53 covers the cooling liquid through hole 512 on the corresponding clamping portion 51, and the heat-conducting plate 53 is used to abut the battery under test 5200.

[0105] In some embodiments of the present application, as shown in FIGS. 4 and 6, the clamp 5100 can further include two heat-conducting plates 53 located between the two clamping portions 51, the two heat-conducting plates 53 being opposite and spaced apart along the first direction, and the two heat-conducting plates 53 being in abutment with the two clamping portions 51, respectively. The heat-conducting plate 53 covers the cooling liquid through hole 512 on the corresponding clamping portion 51, and the heat-conducting plate 53 is used to abut the battery under test 5200.

[0106] Specifically, the battery under test 5200 is arranged between the two heat-conducting plates 53, and the heat-conducting plate 53 abuts the battery under test 5200, and the battery under test 5200 and the heat-conducting plates 53 at both ends of the battery under test 5200 along the first direction are arranged between the two clamping portions 51, and the two heat-conducting plates 53 abut the corresponding clamping portions 51, respectively, that is, along the first direction, the clamping portion 51, the heat-conducting plate 53, the battery under test 5200, the other heat-conducting plate 53, and the other clamping portion 51 are arranged in abutment in sequence, and the heat-conducting plate 53 covers the cooling liquid through hole 512 on the corresponding clamping portion 51, so that the cooling liquid in the cooling liquid through hole 512 indirectly exchanges heat with the battery under test 5200 through the heat-conducting plate 53, which is conducive to reliably limiting the battery under test 5200 by the heat-conducting plate 53, reducing the risk of swelling and deformation of the battery under test 5200 due to poor limiting of the clamping portion 51, and also conducive to providing elastic protection for the heat-conducting plate 53 by the clamping portion 51, reducing the risk of fracture and damage of the heat-conducting plate 53 due to excessive deformation of the battery under test 5200, thereby improving the stability and safety of the battery under test 5200 during testing.

[0107] In some embodiments of the present application, as shown in FIGS. 4, 6, and 7, the surface of the clamping portion 51 facing the heat-conducting plate 53 is formed with a mounting groove 517, the bottom wall of the mounting groove 517 is formed with a cooling liquid through hole 512, and the heat-conducting plate 53 is assembled in the mounting groove 517 of the corresponding clamping portion 51.

[0108] The clamping portion 51 is provided with a mounting groove 517, which can provide a mounting position for the heat conduction plate 53. The mounting groove 517 is formed on the surface of the clamping portion 51 facing the heat conduction plate 53, so that the position of the mounting groove 517 is reasonable, which is beneficial to assemble the heat conduction plate 53 in the mounting groove 517 of the corresponding clamping portion 51. The bottom wall of the mounting groove 517 is provided with a cooling liquid through hole 512, so that the heat conduction plate 53 can be arranged on the cooling liquid through hole 512 of the corresponding clamping portion 51, which is beneficial to the smooth heat exchange between the cooling liquid and the heat conduction plate 53 through the cooling liquid through hole 512, so that the temperature of the heat conduction plate 53 is kept in a suitable range, so that the heat conduction plate 53 and the battery to be tested 5200 can be smoothly exchanged.

[0109] By arranging the mounting groove 517 on the surface of the clamping portion 51 facing the heat conduction plate 53, and assembling the heat conduction plate 53 in the mounting groove 517 of the corresponding clamping portion 51, the peripheral wall of the mounting groove 517 can limit the heat conduction plate 53, reduce the risk of the heat conduction plate 53 falling off between the corresponding clamping portion 51 and the battery to be tested 5200, and facilitate the heat conduction plate 53 to reliably limit the battery to be tested 5200, further reduce the risk of the battery to be tested 5200 swelling and deforming due to poor limiting of the clamping portion 51.

[0110] In some embodiments of the present application, as shown in FIG. 4, the heat conduction plate 53 is an inorganic compound plate, and the clamping portion 51 is a metal piece.

[0111] The heat conduction plate 53 is an inorganic compound plate, for example: silicon carbide, boron nitride, titanium boride, etc. The inorganic compound plate has high hardness, high strength and high thermal conductivity, which can improve the heat exchange efficiency between the heat conduction plate 53 and the battery to be tested 5200, thereby reducing the deformation risk of the battery to be tested 5200 without affecting the heat exchange effect of the battery to be tested 5200. The clamping portion 51 is a metal piece, for example: aluminum, iron, etc. The clamping portion 51 can provide elastic protection for the heat conduction plate 53 to reduce the risk of the heat conduction plate 53 being broken and damaged due to excessive deformation of the battery to be tested 5200.

[0112] In some embodiments of the present application, as shown in FIG. 4, the structures of the two clamping portions 51 are the same.

[0113] The structures of the two clamping portions 51 are the same, which can make the structure design of the two clamping portions 51 reasonable, reduce the number of production molds in the production process of the clamp 5100, thereby reducing the design and production cost of the clamp 5100. In the testing process of the battery to be tested 5200, the structures of the two clamping portions 51 are the same, which can reduce the risk of the two clamping portions 51 being reversely assembled or incorrectly assembled by the tester, thereby reducing the testing difficulty of the battery to be tested 5200, improving the testing efficiency of the battery to be tested 5200, and being beneficial to improving the economy of the production of the clamp 5100 and the testing of the battery to be tested 5200.

[0114] In one embodiment of the present application, the test battery 5200 is at least partially immersed in the cooling liquid when the temperature of the test battery 5200 needs to be adjusted. The cooling liquid is heated or cooled according to the difference between the actual temperature and the target temperature of the test battery 5200, so as to heat or cool the test battery 5200. At the same time, when the test battery 5200 is heated or cooled, the flow field control device is used to adjust the flow rate and direction of the cooling liquid in the test battery 5200 immersion device, so as to optimize the heat transfer efficiency, make the temperature of each part of the test battery 5200 at least partially immersed in the test battery 5200 immersion device uniform, and reduce or eliminate the temperature gradient of the test battery 5200.

[0115] For example, in actual operation, the temperature adjustment device of the test battery 5200 heats or cools the cooling liquid according to the preset target temperature. At the same time, the flow field control device drives the cooling liquid to flow around the test battery 5200 at a preset flow rate and direction. This flow can ensure that the cooling liquid can uniformly cover the surface of the test battery 5200 and take away or add an appropriate amount of heat, so as to make the test battery 5200 reach the target temperature.

[0116] For example, during the test of the test battery 5200, it is required to keep the test battery 5200 at a working temperature range of 20℃±1℃. At this time, if the temperature of the test battery 5200 is lower than the working temperature, the temperature adjustment unit 3 will heat the cooling liquid. At the same time, the flow field control device will operate at a high speed to increase the flow rate of the cooling liquid, so as to ensure that the heat can be quickly and uniformly transferred to the test battery 5200. If the temperature of the test battery 5200 is higher than the working temperature, the temperature adjustment unit 3 will cool the cooling liquid. At the same time, the flow field control device adjusts the speed and direction of the cooling liquid to maintain an appropriate flow rate, so as to ensure that the heat of the test battery 5200 can be continuously and effectively taken away, so as to reduce the temperature of the test battery 5200. Whether in heating or cooling state, the flow field control device will ensure that the cooling liquid flows at a preset flow rate and direction. In this way, not only the heat transfer speed can be accelerated, but also each part of the test battery 5200 can be sufficiently heated or cooled, so as to reduce or eliminate the temperature gradient.

[0117] FIG. 8 is a flowchart of a battery performance test method according to an embodiment of the present application. The battery performance test device of the above embodiment can implement the battery performance test method. As shown in FIG. 8, the battery performance test method comprises the following steps:

[0118] S1, electrically connecting the battery tester with the test battery;

[0119] S2, clamping the test battery by the clamp, and introducing the cooling liquid into the box body by the liquid storage tank, so that the test battery is at least partially immersed in the cooling liquid in the box body;

[0120] S3, adjusting the temperature of the cooling liquid by the temperature adjusting unit;

[0121] S4, testing the battery to be tested by the battery tester.

[0122] As some embodiments of the present application, the battery tester is electrically connected with the positive and negative poles of the battery to be tested, the battery to be tested is clamped by the clamp, and the cooling liquid is introduced into the box by the liquid storage tank, so that the battery to be tested is at least partially immersed in the cooling liquid in the box. It should be noted that the battery tester is electrically connected with the positive and negative poles of the battery to be tested, the battery to be tested is clamped by the clamp, and the cooling liquid is introduced into the box by the liquid storage tank, which does not have a sequence, and the steps can be completed in sequence or simultaneously. Then, the temperature of the cooling liquid is adjusted by the temperature adjusting unit, and the flow of the cooling liquid is controlled by the flow field control device, and then the battery to be tested is tested by the battery tester.

[0123] Wherein, the temperature of the cooling liquid is adjusted by the temperature adjusting unit, which can simulate the different temperature conditions that the battery to be tested may face in actual use.

[0124] The temperature adjusting unit can not only be used to cool the cooling liquid, but also can adjust the temperature of the cooling liquid to high temperature. For example, when the temperature of the cooling liquid is low, the purpose at this time is to test the performance of the battery to be tested when the cooling effect of the battery to be tested in actual use is good, that is, the performance of the water cooling plate is good. When the temperature of the cooling liquid is high, it is used to test the loss performance of the battery to be tested under high temperature when the water cooling of the water cooling plate fails in actual use.

[0125] This way not only can accurately simulate the normal temperature or cooling of the battery to be tested in actual use, effectively restore the thermal management conditions of the battery to be tested in use, and ensure the authenticity and accuracy of the test results; at the same time, it can also simulate the cooling failure of the battery to be tested in actual use by adjusting the temperature of the cooling liquid to high, so as to test the loss degree of the battery to be tested, and improve the applicability and universality of the battery performance testing device.

[0126] As some embodiments of the present application, the flow field control device can be used to control the flow of the cooling liquid to simulate the flow of the cooling liquid in the actual use of the battery under test. Specifically, the flow field control device is used to drive the cooling liquid to flow at a predetermined flow rate and direction. By controlling the flow state of the cooling liquid, the flow field control device can ensure the uniformity and stability of the temperature distribution of the battery under test during testing or operation. It can also accelerate the heating or cooling process of the battery under test. When it is necessary to quickly increase or decrease the temperature of the battery, by increasing or decreasing the flow rate of the cooling liquid, the heat transfer and exchange can be accelerated, so as to achieve faster temperature regulation. Specifically, under the premise that the thermal management conditions of the battery under test meet the requirements, the battery tester is electrically connected to the positive and negative electrodes of the battery under test respectively to test the performance parameters of the battery under test.

[0127] As some embodiments of the present application, the controller can receive the temperature signal fed back by the first temperature sensor, which reflects the current temperature state of the battery under test. According to the preset temperature threshold or temperature regulation strategy, the controller will issue instructions to the temperature regulation unit to start the heating or cooling function, and the controller will issue instructions to the flow field control device to control the working parameters such as power of the flow field control device, and the controller can control the battery tester to test the battery under test.

[0128] For example, while the temperature of the battery under test is being regulated, the controller will also continuously monitor the current temperature of the battery under test. When the current temperature of the battery under test reaches the condition suitable for charging and discharging test (for example, when the temperature is stable and within a safe range), the controller will issue instructions to the battery tester. These instructions can include starting the charging test, discharging test, setting a specific charging and discharging current or voltage, etc. to evaluate the performance of the battery under test under different temperature conditions.

[0129] As some embodiments of the present application, during the test, the controller controls the temperature regulation unit to regulate the temperature of the cooling liquid to a first set temperature, the battery tester tests the performance parameters of the battery under test at the first set temperature, then the temperature regulation unit regulates the temperature of the cooling liquid to a second set temperature, when the temperature of the cooling liquid in the box reaches the second set temperature, the battery tester is used to test the performance parameters of the battery under test at the second set temperature, and then the performance parameters of the battery under test at different temperatures are tested in turn.

[0130] Therefore, the application can realize more comprehensive testing of the battery under test, including evaluating the capacity, internal resistance, cycle life and other key performance indicators of the battery under test, and simulating the temperature environment of the battery under test in actual use. This testing method helps to improve the accuracy and reliability of the test, and provides strong support for the research and development, production and application of batteries. The following is a comparative test using the battery performance testing device of the application, respectively, the battery under test is subjected to charge-discharge test in the air-cooled environment and the fully immersed liquid-cooled environment, and the cooling effect of the batteries in the two groups of tests is compared.

[0131] The test uses ternary batteries of a company as samples, respectively, 1C, 2C and 3C cycle charge-discharge is carried out in the 25℃ environmental chamber and the 25℃ chamber, and the first temperature sensor is pasted on the large surface of the battery to monitor the temperature rise of the battery during the test process. The battery heating conditions in the two environments are compared, and the results are shown in Figure 1 and Table 1. From the test results, the application is superior to the environmental chamber in terms of temperature control of the battery.

[0132] Table 1. Comparison of final temperature rise of the battery

[0133] In the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0134] In the description of the application, "first feature" and "second feature" can include one or more features.

[0135] In the description of the application, "a plurality of" means two or more.

[0136] In the description of the application, "above" or "below" the first feature of the second feature can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween.

[0137] In the description of the application, "above", "above" and "above" of the first feature of the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0138] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. Such terminology means that a particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearances of such terminology in various places in the specification does not necessarily refer to the same embodiment or example. Moreover, it is appreciated that the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0139] Although embodiments of this application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and variations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A battery performance testing device, wherein, include: The housing contains at least one clamp for securing the battery under test. A liquid storage tank contains non-conductive coolant. The tank body has an inlet and an outlet. The outlet of the liquid storage tank is connected to the inlet, and the outlet is connected to the inlet. The system includes a controller, a temperature control unit, and a battery tester. The battery tester is installed outside the housing and is electrically connected to the battery under test. The controller and the temperature control unit are electrically connected to adjust the temperature of the coolant.

2. The battery performance testing device according to claim 1, wherein, The temperature regulation unit includes a first temperature sensor, a heating element, and a cooling element. The heating element and the cooling element are both installed inside the liquid storage tank. The first temperature sensor is fixed to the inner wall of the tank and is used to monitor the temperature information of the coolant inside the tank or the temperature information of the battery under test. The first temperature sensor is electrically connected to the controller, and the controller is electrically connected to the heating element and the cooling element respectively, and is used to control the working state of the heating element and the cooling element according to the temperature information.

3. The battery performance testing apparatus according to claim 1 or 2, wherein, Also includes: The system includes a flow field control device, a regulating valve, an inlet pipe, and an outlet pipe. The inlet end of the inlet pipe is connected to the outlet of the storage tank, the outlet end of the inlet pipe is connected to the inlet port, the inlet end of the outlet pipe is connected to the outlet port, and the outlet end of the outlet pipe is connected to the inlet of the storage tank. The flow field control device is located in the outlet pipe. The regulating valve is installed at both the inlet port and the outlet port. A controller is electrically connected to the flow field control device and the regulating valve, respectively, and is used to control the flow of the coolant.

4. The battery performance testing apparatus according to any one of claims 1-3, wherein, It also includes: multiple partitions, which are fixed to the inner wall of the box and divide the interior of the box into multiple detection chambers; The multiple detection chambers are not interconnected. Each detection chamber has a liquid inlet and a liquid outlet on its wall. The liquid inlet of each detection chamber is connected to the outlet of the storage tank, and the liquid outlet of each detection chamber is connected to the inlet of the storage tank.

5. The battery performance testing apparatus according to any one of claims 1-4, wherein, The clamp is vertically and retractably installed inside the housing.

6. The battery performance testing apparatus according to claim 5, wherein, Also includes: The guide rail is fixed to the side wall of the housing and extends vertically. The clamp is fixed to the slider, and the slider is movably disposed on the guide rail.

7. The battery performance testing apparatus according to any one of claims 1-6, wherein, The clamp includes two clamping parts and a connector. The two clamping parts are opposite to each other along a first direction and spaced apart to form a clamping space between the two clamping parts for placing the battery under test. The connector is connected to both clamping parts to fix the relative position of the two clamping parts. In this embodiment, at least one of the clamping portions is formed with a coolant through hole, the coolant through hole penetrating the corresponding clamping portion along the first direction, and the coolant and the clamping space are disposed opposite to each other along the first direction.

8. The battery performance testing apparatus according to claim 7, wherein, Both clamping parts are provided with a plurality of mounting holes. The plurality of mounting holes on one clamping part correspond one-to-one with the plurality of mounting holes on the other clamping part. The connector passes through the two corresponding mounting holes to fix the relative position of the two clamping parts.

9. The battery performance testing apparatus according to claim 7 or 8, wherein, The clamp further includes: two heat-conducting plates, which are located between the two clamping portions. The two heat-conducting plates are opposite to each other and spaced apart along the first direction. The two heat-conducting plates abut against the two clamping portions respectively. The heat-conducting plates cover the cooling medium through holes on the corresponding clamping portions. The heat-conducting plates are used to abut against the battery device.

10. A battery performance testing method, wherein, include: Connect the battery tester to the battery under test. The battery under test is held by a clamp, and coolant is introduced into the tank from the liquid storage tank. The battery under test is at least partially immersed in the coolant in the tank. The temperature of the coolant is adjusted by a temperature control unit; The battery under test is tested using the battery tester.

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