A power battery thermal management test device and method

Abstract

The application discloses a power battery thermal management test device and method, which comprises a temperature-adjustable environment bin, a partitioned wind field unit for applying longitudinal and transverse wind fields to the bottom of the power battery, a data acquisition unit for collecting the real-time temperature and internal operation parameters of the power battery, a thermal management unit connected with the power battery through a cooling liquid circulation mode and providing the cooling liquid for the power battery to maintain the thermal balance of the power battery, a power load simulation and charging integrated unit for simulating the power load or charging the power battery, and a movable rack for fixing the power battery, the partitioned wind field unit, the thermal management unit and the power load simulation and charging integrated unit. The power battery thermal management system test and calibration verification are performed by simulating the dynamic wind field and temperature field around the power battery under the actual whole vehicle environment, and the test environment close to the real situation of the whole vehicle road driving is created.

Description

Technical Field

[0001] This invention relates to the field of power battery thermal management technology, specifically to a power battery thermal management test apparatus and method. Background Technology

[0002] New energy vehicles, with their advantages of energy saving and no environmental pollution, have become an important direction for the development of the automotive industry. Electric vehicles are a crucial development area within new energy vehicles. However, for electric vehicles, widespread adoption across all climates, regions, and lifecycles still faces many challenges, such as short driving range in low temperatures, slow charging speeds at high and low temperatures, and rapid lifespan degradation at high and low temperatures. It is estimated that the thermal management system of new energy vehicles has an average impact of over 30% on driving range. Therefore, the industry has been actively seeking new solutions for the development and verification of thermal management systems for new energy vehicles.

[0003] Electric vehicle power batteries typically employ lithium iron phosphate (LFP) batteries and ternary lithium-ion batteries, which offer numerous advantages in terms of specific energy, specific power, safety performance, and cycle performance, leading to their widespread use in electric vehicles. Currently, the permissible operating temperature range for lithium-ion batteries is approximately 0℃ to 55℃, with an ideal operating temperature range of approximately 15℃ to 35℃. For typical user scenarios, vehicles are generally required to operate normally within a temperature range of -40℃ to 55℃. Therefore, when vehicles are used in extreme ambient temperatures—meaning temperatures below 0℃ or above 55℃—it is necessary to develop, calibrate, and test a thermal management system to heat the vehicle at low temperatures and cool it at high temperatures. This ensures the vehicle can operate normally under all usage conditions.

[0004] The current technological trend in thermal management systems for new energy vehicles is the highly intelligent integration of multiple thermal systems, including the air conditioning system, the power battery system, and the electric drive system. When conducting thermal management tests on the power battery system, the current conventional method is to use a high and low temperature environmental test chamber to simulate the environment the battery would experience in an actual vehicle. The battery pack is then placed on an internal platform within the chamber for thermal management system testing and verification. This testing method is merely a static simulation and cannot fully simulate the dynamic environment of the battery pack during actual vehicle operation. It does not consider the wind and temperature fields around the battery pack under the chassis during vehicle movement, nor the flow and temperature fields between the battery pack cover and the vehicle floor. Conventional testing methods cannot accurately measure the impact of the flow and temperature fields around the battery pack on the battery's thermal management response, which may lead to problems such as large temperature differences between different areas of the battery, low operating efficiency of the thermal management system, and high overall vehicle energy consumption.

[0005] Testing the operation of the power battery thermal management system by placing the entire vehicle directly in an environmental chamber is a method that involves a long setup period, uneven temperature collection points at both ends of the battery pack, high vehicle testing costs, and long temperature rise and fall cycles. This makes it difficult to quickly and accurately conduct dynamic environmental simulation testing and calibration of the power battery in the vehicle. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a power battery thermal management test device and method. By simulating the dynamic wind and temperature fields around the power battery in a real vehicle environment, it performs power battery thermal management system testing and calibration verification. By creating a test environment that closely approximates the real-world driving conditions of a vehicle, it solves the problems of large temperature deviation, low efficiency, and high energy consumption in existing new energy vehicle power battery thermal management test devices.

[0007] The power battery thermal management test device of the present invention comprises:

[0008] An environmental chamber with an adjustable temperature;

[0009] A zoned wind field unit applies longitudinal and lateral wind fields to the bottom of the power battery.

[0010] The data acquisition unit collects the real-time temperature and internal operating parameters of the power battery.

[0011] A thermal management unit is connected to the power battery via a coolant circulation method to provide coolant to the power battery in order to maintain the thermal balance of the power battery.

[0012] A power load simulation and charging integrated unit is connected to a power battery and is used to simulate power loads or charge the power battery.

[0013] A movable test bench is used to fix the power battery, the zoned wind farm unit, the data acquisition unit, the thermal management unit, and the power load simulation and charging integration unit.

[0014] Furthermore, the partitioned wind field unit includes two independently controlled longitudinal wind field channels and a transverse wind field channel. A first fan is fixed at the first air inlet of the longitudinal wind field channel, and a second fan is fixed at the second air inlet of the transverse wind field channel. The power battery is placed at the air outlet of the longitudinal wind field channel and the transverse wind field channel.

[0015] Furthermore, the partitioned wind field unit includes a housing and a partition. The partition is fixed inside the housing and divides the housing into two parallel chambers, a first chamber and a second chamber. The first chamber serves as a longitudinal wind field channel, with a first air inlet at the front and a first fan fixed at the first air inlet. The second chamber serves as a transverse wind field channel, with a second air inlet at the front and a second fan fixed at the second air inlet. The rear of the first chamber is a functional chamber for accommodating the power battery. The rear of the partition has several through holes connecting the functional chamber and the second chamber. Each through hole is connected to a set of adjustable-angle guide vanes. By independently controlling the rotation angle of each set of guide vanes, the through holes can be opened or closed, thereby achieving multi-angle control of the transverse wind field channel.

[0016] Furthermore, the number of the guide vanes is six, with three sets of guide vanes arranged at intervals along the front-back direction on the partition plate, and three sets of guide vanes corresponding to the positions of the guide vanes on the partition plate are fixed on the right side of the housing.

[0017] Furthermore, the movable platform includes a first frame, a second frame, and multiple rollers located at the bottom of the first and second frames. The first frame is used to fix the zoned wind field unit, and a rear plate is detachably connected to the rear of the first frame. The top of the second frame is used to fix the data acquisition unit, the thermal management unit, and the power load simulation and charging integration unit. The upper end of the power battery is fixedly connected to the bottom end of the second frame through multiple flexible heat insulation plates.

[0018] Furthermore, the data acquisition unit includes a temperature sensor, a windproof cover, and a data acquisition module. Several temperature sensors are fixed on the upper and lower surfaces of the power battery, and the temperature sensor covers are equipped with windproof covers. The data acquisition module is connected to the data output interface of the temperature sensors and the power battery to collect the real-time temperature and internal operating parameters of the power battery in real time.

[0019] Furthermore, the power battery is equipped with an inlet and an outlet, which are connected to the thermal management unit to realize the circulation of coolant inside the power battery.

[0020] Furthermore, the power battery is equipped with a power output interface and a charging interface that are connected to the power load simulation and charging integration unit.

[0021] Furthermore, the environmental chamber includes a closed chamber and a temperature regulating unit for regulating the internal temperature of the closed chamber.

[0022] A method for testing the thermal management of a power battery, using the power battery thermal management testing device described in this invention to test the power battery, specifically includes the following steps:

[0023] S1, the power battery, the zoned wind farm unit, the thermal management unit, and the power load simulation and charging integration unit are fixed on a movable platform, and the data acquisition unit, the thermal management unit, and the power load simulation and charging integration unit are connected to the power battery;

[0024] S2, the power battery is placed in the environmental chamber via a movable platform, the temperature of the environmental chamber is adjusted to -30℃~60℃, and the environmental chamber is sealed;

[0025] S3. After the surface temperature of the power battery is constant, the thermal management unit and the power load simulation and charging integration unit are turned on, so that the power battery operates according to the set operating conditions. The set operating conditions include charging conditions or power output conditions. The real-time temperature and internal operating parameters of the power battery are collected in real time through the data acquisition unit.

[0026] S4 determines whether the thermal management capability of the power battery meets the set requirements based on the collected data.

[0027] Furthermore, the set operating conditions in S3 include charging operating conditions or power output operating conditions.

[0028] Furthermore, the ambient temperature setting in S2 is 60℃ or -30℃.

[0029] Compared with the prior art, the present invention has the following beneficial effects.

[0030] 1. The power battery thermal management test device of the present invention can provide an environmental chamber with adjustable temperature. Through the partitioned wind field unit, longitudinal wind field and lateral wind field are applied to the bottom of the power battery, and the environmental chamber applies a constant temperature field to the top of the power battery. This fully simulates the actual application environment of the power battery during the vehicle's road driving process. It fully simulates the actual vehicle environment and collects key information such as the real-time heat distribution of the power battery, the operation effect of the power battery coolant system, and the power battery power output. This allows for calibration and matching of the optimal layout and response logic of the power battery thermal management system. At the same time, it can also effectively simulate the thermal management effect and power output linearity of the power battery under high cold or high heat conditions, which is conducive to confirming the operation capability and optimization scheme of the power battery thermal management system under extreme conditions.

[0031] 2. This invention uses a power load simulation and charging integration unit to replace the output loads of the vehicle's electric drive and compressor, a thermal management unit simulation system to replace the liquid cooling thermal management control system of the power battery, a movable test bench to replace the vehicle body, and an environmental chamber to replace the actual operating environment of the vehicle. Taking all these factors into account, it fully restores the various environmental conditions of the power battery during the vehicle's operation, enabling rapid preparation and switching for power battery testing, fast testing cycle, accurate data acquisition, and low testing cost. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the power battery thermal management test device described in this invention;

[0033] Figure 2 This is a schematic diagram of the structure of the environmental chamber described in this invention;

[0034] Figure 3 This is an exploded view of the power battery thermal management test device described in this invention;

[0035] Figure 4 This is a schematic diagram of the structure of the partitioned wind field unit described in this invention;

[0036] Figure 5 This is a schematic diagram of the structure of the second frame of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of the data acquisition unit, thermal management unit, and power load simulation and charging integration unit of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the power battery under test;

[0039] Figure 8 This is a schematic diagram of the temperature sensor described in this invention.

[0040] In the diagram, 1—Environmental chamber, 11—Top plate, 12—Side plate, 13—Bottom plate, 14—Door, 15—Temperature control unit, 16—Controller, 2—Zoned airflow unit, 21—Shell, 211—First air inlet, 212—Second air inlet, 213—Front cover, 214—Side cover, 215—Top cover, 22—Partition, 23—First chamber, 24—Second chamber, 25—First fan, 26—Second fan, 27—Through hole, 28—Guide 3—Fan blade, 4—Data acquisition unit, 5—Temperature sensor, 6—Wind shield, 7—Data acquisition module, 8—Thermal management unit, 9—Power load simulation and charging integration unit, 10—Movable platform, 11—First frame, 12—Second frame, 13—Rear plate, 14—Roller, 15—Flexible heat insulation plate, 16—Power battery, 17—Liquid inlet, 18—Liquid outlet, 19—Power output interface, 10—Charging interface, 11—Data output interface. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] In the description of this invention, it should be understood that the terms "vertical," "parallel," "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Example 1, see Figures 1 to 8 The power battery thermal management test device shown includes: an environmental chamber 1 with an adjustable temperature; a zoned airflow unit 2 that applies longitudinal and lateral airflow to the bottom of the power battery 8; a data acquisition unit 3 that collects real-time temperature and internal operating parameters of the power battery 8; a thermal management unit 4 connected to the power battery 8 via a coolant circulation system to provide coolant to maintain the thermal balance of the power battery 8; a power load simulation and charging integration unit 5 connected to the power battery 8 for simulating power loads or charging the power battery 8; and a movable platform 6 for fixing the power battery 8, the zoned airflow unit 2, the data acquisition unit 3, the thermal management unit 4, and the power load simulation and charging integration unit 5.

[0045] See Figure 2The environmental chamber 1 includes a top plate 11, side plates 12, and a bottom plate 13, which together form a closed chamber. A temperature regulating unit 15 for adjusting the internal temperature of the closed chamber is fixed on the top plate 11. The temperature regulating unit 15 is connected to a controller 16, which sends an action signal to the temperature regulating unit 15. The temperature regulating unit 15 includes multiple sets of evaporator / condenser heat exchange units. The temperature regulating unit 15 is used to regulate the internal temperature of the closed chamber, thereby switching and providing the required ambient temperature according to different test conditions.

[0046] See Figure 3 and Figure 4 The partitioned wind field unit 2 includes a housing 21 and a partition 22. The partition 22 is fixed inside the housing 21 and divides the housing 21 into two side-by-side chambers, a first chamber 23 and a second chamber 24. The first chamber 23 is located to the right of the second chamber 24 and serves as a longitudinal wind field channel. A first air inlet 211 is provided at the front of the first chamber 23, and a first fan 25 is fixed at the position of the first air inlet 211. The second chamber 24 serves as a transverse wind field channel. A second air inlet 212 is provided at the front of the second chamber 24, and a second fan 26 is fixed at the position of the second air inlet 212. The rear of the first chamber 23 is a functional chamber for accommodating the power battery 8, i.e., the power battery 8 is placed at the air outlet of the longitudinal and transverse wind field channels.

[0047] The rear part of the partition 22 is provided with three through holes 27 connecting the first chamber 23 and the second chamber 24. A set of air guide vanes 28 with adjustable rotation angle are connected to the through holes. The air guide vanes 28 are connected to the stepper motor through the connecting rod, so that the rotation angle of each set of air guide vanes 28 can be independently controlled, so that the air guide vanes 28 can be positioned at any angle within the range of 0~90°, realizing the opening or closing of the through holes 27 and the adjustment of the air supply angle, thereby realizing the multi-air supply angle control of the transverse wind field channel.

[0048] Preferably, there are six sets of guide vanes 28, with three sets of guide vanes 28 spaced apart along the front-rear direction at the rear of the partition 22, and three sets of guide vanes 28 fixed on the right side of the housing 21 corresponding to the positions of the guide vanes 28 on the partition 22. The air generated by the first fan 25 flows from the longitudinal airflow channel to the rear chamber containing the power battery 8, providing longitudinal airflow to the bottom of the power battery. The air generated by the second fan 26 enters the chamber containing the power battery 8 after passing through the second chamber 24 and the through hole 27 on the partition 22, providing lateral airflow to the bottom of the power battery 8.

[0049] To better arrange the first fan 25 and the second fan 26, the housing 21 is generally L-shaped, including a vertical section and a horizontal section, with the front end of the horizontal section connected to the lower end of the vertical section. The first fan 25 is fixed to the right front side of the vertical section, and the second fan 26 is fixed to the left front side of the vertical section. The rear side of the vertical section 25 is closed by a front cover plate 213, the left and right sides of the housing 21 are closed by side cover plates 214, and the top of the horizontal section is closed by an upper cover plate 215. The upper cover plate 215 has through holes corresponding to the position of the working chamber, allowing the power battery 8 to smoothly enter the working chamber. The front cover plate 213, side cover plate 214, and upper cover plate 215 are stainless steel plates with a thickness greater than 5mm.

[0050] The movable platform 6 includes a first frame 61, a second frame 62, and a plurality of rollers 64 disposed at the bottom of the first frame 61 and the second frame 62. The first frame 61 is used to fix the partitioned wind field unit 2. A rear plate 63 is detachably connected to the rear of the first frame 61. When installing and fixing the partitioned wind field unit 2 to the first frame 61, the rear plate 63 is first removed, the partitioned wind field unit 2 is slid into the first frame 61 from back to front, and then the rear plate 63 is installed and fixed.

[0051] The top of the second frame 62 is used to fix the data acquisition unit 3, the thermal management unit 4, and the power load simulation and charging integration unit 5. The upper end of the power battery 8 is fixedly connected to the bottom end of the second frame 62 through multiple flexible heat insulation plates 7. The flexible heat insulation plates 7 form a sealed space on the upper surface of the power battery 8, locking in a stable thermal field or a stable cold field inside the space. The flexible heat insulation plates 7 can extend and retract vertically and horizontally, and the height and planar direction of the enclosed space can be flexibly adjusted to ensure that the entire upper surface of the power battery 8 under test is covered.

[0052] The data acquisition unit 3 includes a temperature sensor 31, a windproof cover 32, and a data acquisition module 33. Several temperature sensors 31 are fixed to the upper and lower surfaces of the power battery 8, and the temperature sensors 31 are covered by the windproof cover 32. The data acquisition module 33 is connected to the data output interface 85 of the temperature sensors 31 and the power battery 8, and collects the real-time temperature and internal operating parameters of the power battery 8. The temperature sensor 31 is a wireless temperature sensor, and its transmission antenna passes through the windproof cover 32.

[0053] The power battery is equipped with an inlet 81, an outlet 82, a power output interface 83, a charging interface 84, and a data output interface 85. The inlet 81 and outlet 82 are connected to the thermal management unit 4 to realize the circulation of coolant inside the power battery 8. The power output interface 83 and charging interface 84 are connected to the power load simulation and charging integration unit, and the data output interface 85 is connected to the data acquisition unit 3.

[0054] The power battery thermal management test device provides an adjustable temperature environment chamber 1. Through the partitioned wind field unit 2, longitudinal and lateral wind fields are applied to the bottom of the power battery 8, and a constant temperature field is applied to the top of the power battery 8 by the environment chamber 1. This fully simulates the actual application environment of the power battery 8 during the vehicle's road driving process. It also fully simulates the actual vehicle environment and collects key information such as the real-time heat distribution of the power battery 8, the operating effect of the power battery coolant system, and the power battery power output. This allows for calibration and matching of the optimal layout and response logic of the power battery thermal management system. At the same time, it can effectively simulate the thermal management effect and power output linearity of the power battery under extremely cold or hot environmental conditions, which is helpful in confirming the operating capability and optimization scheme of the power battery thermal management system under extreme environments.

[0055] The power load simulation and charging integration unit 5 replaces the output loads of the vehicle's electric drive, compressor, etc. The thermal management unit 4 simulates the system to replace the liquid cooling thermal management control system of the power battery. The movable test bench 6 replaces the vehicle body. The environmental chamber 1 replaces the actual operating environment of the vehicle. Taking all these factors into account, the various environmental conditions of the power battery 8 during the operation of the vehicle are fully reproduced, so as to realize the rapid preparation and switching of the power battery 8 test, the test cycle is fast, the data acquisition is accurate, and the test cost is low.

[0056] Example 2: A power battery thermal management test method, which uses the power battery thermal management test device described in Example 1 of this invention to conduct a static high-temperature environment charging simulation test on the power battery, specifically including the following steps:

[0057] S1, fix the partitioned wind field unit 2 on the first frame 61, and fix the power battery 8, data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 on the second frame 62. The data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 are connected to the power battery 8.

[0058] S2, after completing the stage arrangement of S1, push the second frame 62 towards the first frame 61 so that the power battery 8 is located in the working chamber of the partitioned wind field unit 2. Then, push the power battery 8 into the environmental chamber 1 through the movable stage 6. Adjust the temperature of the environmental chamber 1 to 60°C through the temperature adjustment unit 15, and close the door 14 to seal the environmental chamber 1.

[0059] S3. After the surface temperature of the power battery 8 stabilizes, i.e., the surface temperature of the power battery 8 obtained by the data acquisition unit 3 is equal to the temperature of the substrate of the ambient chamber 1, and the temperature difference between the two is ≤1.0℃ and maintained for at least 20 minutes, the thermal management unit 4 and the power load simulation and charging integration unit 5 are then activated. The thermal management unit 4 simulates the actual coolant circulation of the power battery 8, and the power load simulation and charging integration unit 5 charges the power battery, simulating the charging of the power battery 8 in a high-temperature environment. The data acquisition unit 3 continuously collects the real-time temperature and internal operating parameters of the power battery, i.e., the data acquisition unit 3 continuously collects the upper and lower surface temperatures of each area of ​​the power battery 8, the internal temperature of the battery, the coolant temperature, and the ambient chamber temperature.

[0060] S4. The collected dynamic temperature data is aggregated to the industrial control host. The preset system in the industrial control host draws a temperature-time graph based on the collected data. By comparing the temperature differences of each group, the temperature difference of each area on the upper and lower surfaces of the power battery is obtained. The software simulation is used to form a temperature field map of the power battery surface. The temperature field map can intuitively display the temperature status of each area on the surface of the power battery to verify the rationality of the layout and the timeliness of the liquid cooling thermal management system of the power battery during the high-heat environment charging process.

[0061] It should be noted that the temperature of the environmental chamber 1 can also be set to -30℃, thereby verifying the rationality of the layout and the timeliness of the power battery liquid cooling thermal management system during charging in cold environments.

[0062] Example 3: A power battery thermal management test method, which uses the power battery thermal management test device described in Example 1 of this invention to conduct a static high thermal environment load simulation test on the power battery, specifically including the following steps:

[0063] S1, fix the partitioned wind field unit 2 on the first frame 61, and fix the power battery 8, data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 on the second frame 62. The data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 are connected to the power battery 8.

[0064] S2, after completing the stage arrangement of S1, push the second frame 62 towards the first frame 61 so that the power battery 8 is located in the working chamber of the partitioned wind field unit 2. Then, push the power battery 8 into the environmental chamber 1 through the movable stage 6. Adjust the temperature of the environmental chamber 1 to 60°C through the temperature adjustment unit 15, and close the door 14 to seal the environmental chamber 1.

[0065] S3. After the surface temperature of the power battery 8 stabilizes, i.e., the surface temperature of the power battery 8 obtained by the data acquisition unit 3 is equal to the temperature of the substrate of the ambient chamber 1, with a temperature difference of ≤1.0℃ and maintained for at least 20 minutes, the thermal management unit 4 and the power load simulation and charging integration unit 5 are then activated. The thermal management unit 4 simulates the actual coolant circulation of the power battery 8, and the power battery 8 output is started. The power load simulation and charging integration unit 5 is used as the load device to simulate the power battery output under high heat conditions. The data acquisition unit 3 collects the real-time temperature and internal operating parameters of the power battery in real time, i.e., continuously collects the upper and lower surface temperatures of each area of ​​the power battery 8, the internal temperature of the battery, the coolant temperature, the ambient chamber temperature, and parameters such as the power battery output power, voltage, and current. By comparing the collected data, the output stability of the power battery, the response timeliness and operating capability of the internal liquid cooling thermal management system of the power battery are analyzed when the vehicle starts under high heat conditions. By comparing the data, key anomalies are identified, and the design layout and selection are optimized through reverse engineering, and calibration tests are performed for the overall performance design of the power battery.

[0066] Example 4: A power battery thermal management test method, which uses the power battery thermal management test device described in Example 1 of this invention to conduct dynamic high thermal environment load simulation tests on the power battery, specifically including the following steps:

[0067] S1, fix the partitioned wind field unit 2 on the first frame 61, and fix the power battery 8, data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 on the second frame 62. The data acquisition unit 3, thermal management unit 4 and power load simulation and charging integration unit 5 are connected to the power battery 8.

[0068] S2, after completing the stage arrangement of S1, push the second frame 62 towards the first frame 61 so that the power battery 8 is located in the working chamber of the partitioned wind field unit 2. Then, push the power battery 8 into the environmental chamber 1 through the movable stage 6. Adjust the temperature of the environmental chamber 1 to 60°C through the temperature adjustment unit 15, and close the door 14 to seal the environmental chamber 1.

[0069] S3, activate zoned airflow unit 2. After the surface temperature of power battery 8 stabilizes, activate thermal management unit 4 and power load simulation and charging integration unit 5. The lateral airflow channel of zoned airflow unit 2 operates in a 0~90° range of sweeping mode. Thermal management unit 4 simulates the actual coolant circulation of power battery 8, initiating power battery 8 output. Power load simulation and charging integration unit 5 acts as the load device, simulating the dynamic output of power battery under high-temperature conditions. Data acquisition unit 3 continuously collects real-time temperature and internal operating parameters of power battery, including the upper and lower surface temperatures of each zone of power battery 8, internal battery temperature, coolant temperature, ambient chamber temperature, and power battery output power, voltage, and current. Through data analysis and calculation, plot the relationship curves between temperature field changes, airflow changes, power battery output, and thermal management system operation. Perform thermal management system capability tests, limit tests, and response tests to identify thermal management weaknesses in actual operating environments, optimize and improve the design, and calibrate and match the overall power battery thermal management system operation capability.

[0070] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power battery thermal management test device, characterized in that, include: An environmental chamber (1) with an adjustable temperature; A partitioned wind field unit (2) applies a longitudinal wind field and a transverse wind field to the bottom of the power battery (8). The partitioned wind field unit (2) includes a housing (21) and a partition (22). The partition (22) is fixed inside the housing (21) and divides the housing (21) into two parallel chambers, a first chamber (23) and a second chamber (24). The first chamber (23) serves as a longitudinal wind field channel. A first air inlet (211) is provided at the front of the first chamber (23), and a first fan (25) is fixed at the position of the first air inlet (211). The second chamber (24) serves as a transverse wind field channel. A second air inlet (212) is provided at the front of the second chamber (24), and a second fan (26) is fixed at the position of the second air inlet (212). The rear of the first chamber (23) is a working chamber for accommodating the power battery (8). The rear of the partition (22) is provided with several through holes (27) connecting the working chamber and the second chamber (24). A set of wind guide vanes (28) with adjustable rotation angle are connected to the through holes (27). By independently controlling the rotation angle of each set of wind guide vanes (28), the through holes (27) can be opened or closed to achieve multi-angle control of the transverse wind field channel. The data acquisition unit (3) collects the real-time temperature and internal operating parameters of the power battery (8) in real time. Thermal management unit (4) is connected to power battery (8) through coolant circulation to provide coolant to power battery (8) in order to maintain the thermal balance of power battery; A power load simulation and charging integrated unit (5) is connected to a power battery (8) and is used to simulate power load or charge the power battery (8). The movable stand (6) is used to fix the power battery (8), the zoned wind field unit (2), the data acquisition unit (3), the thermal management unit (4), and the power load simulation and charging integration unit (5).

2. The power battery thermal management test device according to claim 1, characterized in that: The number of the guide vanes (28) is six. Three sets of guide vanes (28) are arranged at intervals along the front and rear direction on the partition (22). Three sets of guide vanes (28) corresponding to the positions of the guide vanes (28) on the partition (22) are fixed on the right side of the housing (21).

3. The power battery thermal management test device according to claim 1, characterized in that: The movable platform (6) includes a first frame (61), a second frame (62), and a plurality of rollers (64) located at the bottom of the first frame (61) and the second frame (62). The first frame (61) is used to fix the zoned wind field unit (2). The top of the second frame (62) is used to fix the data acquisition unit (3), the thermal management unit (4) and the power load simulation and charging integration unit (5). The upper end of the power battery (8) is fixedly connected to the bottom end of the second frame (62) through multiple flexible heat insulation plates (7).

4. The power battery thermal management test device according to claim 1, characterized in that: The data acquisition unit (3) includes a temperature sensor (31), a windproof cover (32), and a data acquisition module (33). Several temperature sensors (31) are fixed on the upper and lower surfaces of the power battery (8), and the temperature sensors (31) are covered with windproof covers (32). The data acquisition module (33) is connected to the data output interface (85) of the temperature sensor (31) and the power battery (8) to collect the real-time temperature and internal operating parameters of the power battery (8) in real time.

5. The power battery thermal management test device according to claim 1, characterized in that: The power battery (8) is provided with an inlet (81) and an outlet (82), which are connected to the thermal management unit (4) to realize the circulation of coolant inside the power battery (8).

6. The power battery thermal management test device according to claim 1, characterized in that: The power battery (8) is provided with a power output interface (83) and a charging interface (84) connected to the power load simulation and charging integration unit (5).

7. The power battery thermal management test device according to claim 1, characterized in that: The environmental chamber (1) includes a closed chamber and a temperature regulating unit (15) for regulating the internal temperature of the closed chamber.

8. A test method for thermal management of a power battery, characterized in that: The power battery thermal management test device according to any one of claims 1 to 7 is used to test the power battery, specifically including the following steps: S1, fix the power battery (8), the zoned wind farm unit (2), the data acquisition unit (3), the thermal management unit (4) and the power load simulation and charging integration unit (5) on the movable platform (6), and the data acquisition unit (3), the thermal management unit (4) and the power load simulation and charging integration unit (5) are connected to the power battery (8); S2, the power battery (8) is placed in the environmental chamber through the movable platform (6), the temperature of the environmental chamber is adjusted to -30℃~60℃, and the environmental chamber is sealed; S3, after the surface temperature of the power battery (8) is constant, the thermal management unit (4) and the power load simulation and charging integration unit (5) are turned on so that the power battery (8) operates according to the set working conditions. The set working conditions include charging working conditions or power output working conditions. The real-time temperature and internal operating parameters of the power battery (8) are collected in real time through the data acquisition unit (3). S4, based on the collected data, determine whether the thermal management capability of the power battery (8) meets the set requirements.

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