Power battery thermal management test device, test system and test method

Abstract

The invention discloses a power battery thermal management test device, test system and test method, belongs to the technical field of power battery thermal management, and solves the problem of how to improve the test accuracy of thermal management test of a power battery under various vehicle types and complex scenes. The hollowed-out area of the bottom plate can be adjusted by arranging the movable plate on the bottom plate, the lifting support is matched with the hollowed-out hole of the bottom plate, the bottom air inlet area of the battery pack can be increased, wiring harnesses are installed on the battery pack in the cavity through the wire passing hole formed in the upper cover, and redundant wire passing holes can be sealed through silica gel plugs. The method is consistent with the actual installation condition of the battery pack, greatly improves the reduction degree between the laboratory test environment and the actual application environment of the battery system, and improves the accuracy of the thermal management test result of the battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of power battery thermal management, and relates to a power battery thermal management test device, a test system and a test method. Background Art

[0002] With the continuous development of science and technology and the increasing severity of the environmental energy crisis, new energy vehicles are more and more widely used. The power battery is a common power source in new energy vehicles and is one of the most important components in the vehicle. The thermal management ability of the power battery is directly related to the safety of the battery pack, the battery charging efficiency and the user experience. In the charging scenario, the excessive temperature rise of the battery pack not only affects the charging speed, but also may cause the risk of thermal runaway. And the charging speed of the battery directly affects the user experience. Therefore, it is very necessary to test the thermal management ability of the power battery.

[0003] At present, there is no unified thermal management test standard in the country. The thermal management test experiments are usually designed by the manufacturers themselves. Limited by the test conditions of the laboratory, there are significant deviations between the test results, the simulation data and the actual vehicle conditions. The prior art, such as the invention patent with the application publication number CN117347883A, discloses a battery thermal management performance test tooling, a test system and a test method. By setting the support frame and the windshield, the bottom of the battery pack can be communicated with the outside through the hollow holes, so that the installation state of the battery pack on the vehicle can be more realistically simulated, overcoming the problem of large test errors caused by the direct blowing of the air flow on the battery pack in the traditional simulation test, and facilitating the improvement of the accuracy of the simulation test. However, it still has the following defects:

[0004] (1) Poor adaptability of the test tooling: Since the support frame is of a hollow design, and commercial vehicle models such as heavy trucks or buses have full-closed installation requirements, it will cause the distortion of the heat dissipation simulation results; (2) Limited test scenarios: Although the prior art discloses simulating the operating conditions of the battery pack in the vehicle through an environmental test chamber, it only supports the thermal management test under static test conditions such as high and low temperature static state, basic charge and discharge, etc. The actual vehicle conditions are more complex than the static test conditions provided by the laboratory, and the test accuracy in complex scenarios is still limited.

[0005] In summary, there is an urgent need for a thermal management test scheme for power batteries that can simulate the actual vehicle conditions, adapt to various vehicle models, and support composite scenario tests, so as to provide a reliable basis for optimizing the thermal management strategy of the battery pack. Summary of the Invention

[0006] The technical problem to be solved by the present invention is how to improve the test accuracy of the thermal management test of the power battery under various vehicle models and complex scenarios.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A power battery thermal management test device, comprising:

[0009] A bottom plate, on the surface of which there are a number of hollow holes, and the hollow area of the bottom plate is adjustable;

[0010] A lifting support, which is arranged on the upper surface of the bottom plate and is used to carry the battery pack;

[0011] An upper cover, which is arranged on the upper surface of the bottom plate and forms a cavity with the bottom plate that can cover the lifting support. There are a number of wire passing holes on both sides of the upper cover, and the wire passing holes of the upper cover can be closed by setting silicone plugs.

[0012] Furthermore, there are a number of movable plates arranged on the bottom plate. The size of the movable plate is the same as that of the hollow hole. The bottom plate closes the hollow hole through the movable plate to adjust the hollow area of the bottom plate.

[0013] The power battery thermal management test device provided by the present invention can simulate the installation environment of the battery pack in different vehicle models to match the requirements of different vehicle models; by arranging movable plates on the bottom plate, the hollow area of the bottom plate can be adjusted. The lifting support cooperates with the hollow holes of the bottom plate, which can increase the bottom air intake area of the battery pack. The peripheral wires of the battery pack installed in the cavity are arranged through the wire passing holes provided on the upper cover, and the redundant wire passing holes can be closed by silicone plugs, which is consistent with the actual installation working condition of the battery pack, greatly improving the reduction degree between the laboratory test environment and the actual application environment of the battery system, and improving the accuracy of the battery thermal management test results.

[0014] A power battery thermal management test system, comprising:

[0015] An environmental test chamber, which includes the above-mentioned power battery thermal management test device, a fan, and a battery pack; the battery pack is placed in the cavity of the power battery thermal management test device to simulate different actual vehicle conditions;

[0016] A DC power supply device, which provides driving current to the battery pack through a low-voltage wire harness;

[0017] A liquid cooling device, the equipment water outlet and the equipment water return port of which are respectively connected to the battery pack water inlet and the battery pack water outlet of the battery pack;

[0018] A charge and discharge cabinet, which is connected to the battery pack through a high-voltage wire to provide a high-voltage charging current to the battery pack; the charge and discharge cabinet is also connected to the battery through a heating wire harness;

[0019] An upper computer, which is communicatively connected to the charge and discharge cabinet and the environmental test chamber through a CAN bus.

[0020] A thermal management test method for a power battery, comprising the following steps:

[0021] S1. Install the above-mentioned power battery thermal management test system, and adjust the hollow area of the power battery thermal management test device according to the size of the battery pack to be tested;

[0022] S2. Arrange external temperature sensors to monitor the temperature of single cells and high-voltage components of the battery pack to be tested;

[0023] S3. Connect the peripheral wiring harness to the battery pack to be tested through the wire passing holes, and seal the unused wire passing holes;

[0024] S4. Pretreat the battery pack to be tested to activate the battery pack to reach its optimal working state;

[0025] S5. Calibrate the initial capacity and energy of the battery pack to be tested;

[0026] S6. Conduct thermal management tests based on different thermal management working conditions; wherein, the different thermal management working conditions include charging condition, discharging condition, fast charging-driving condition, driving-fast charging condition, fast charging-driving-fast charging condition, driving-fast charging-driving condition, heating-charging, driving-heating and heat preservation condition;

[0027] S7. After the thermal management test is completed, dismantle the test bench.

[0028] The present invention provides a thermal management test method for a power battery that can simulate the actual working conditions of a whole vehicle, and provides a standardized thermal management test scheme under a variety of composite scenarios, providing a means for horizontal comparison of the thermal management performance of different battery packs, covering complex dynamic working conditions, effectively improving the accuracy of thermal management test results under dynamic working conditions, providing a reliable basis for optimizing the thermal management strategy of the battery pack, being beneficial to reducing the R & D cycle of the whole vehicle, reducing the risk of thermal management failure of the whole vehicle, and improving the competitiveness of power battery products.

[0029] Further, activating the battery pack to reach its optimal working state in S4 specifically means: under standard test temperature conditions, charging according to the test method recommended by the battery supplier or charging at the rated current to the cut-off voltage, standing still after charging, and then discharging at the rated current to the cut-off voltage; repeating the above operations multiple times until the cut-off condition is met.

[0030] Further, the rated current of the battery pack is 1C, and the standard test temperature is 25 ± 2°C.

[0031] Further, the cut-off condition specifically means: at least two changes not exceeding 3% of the rated power.

[0032] Further, S6 includes:

[0033] S61. Conduct thermal management tests under charging conditions, including the following steps:

[0034] S611. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test to the cut-off voltage using the rated current.

[0035] S612. Adjust the ambient temperature to the target temperature, charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy changes during the charging of the battery pack under test.

[0036] Further, S6 also includes:

[0037] S62. Conduct thermal management tests under discharging conditions, including the following steps:

[0038] S621. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test to the cut-off voltage using the current of the rated current.

[0039] S622. Let the battery pack under test adapt to the ambient temperature of the standard test temperature, specifically, let the battery pack under test stand still until all the built-in temperature sensors of the battery pack under test reach the standard test temperature.

[0040] S623. Charge according to the fast charging strategy of the battery pack under test.

[0041] S624. Adjust the ambient temperature to the target temperature, discharge according to the discharging strategy of the battery pack under test, and record the temperature rise, discharging capacity, and energy changes during the discharging of the battery pack under test.

[0042] Further, S6 also includes:

[0043] S63. Conduct thermal management tests under fast charging - driving conditions, including the following steps:

[0044] S631. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test to the cut-off voltage using the rated current.

[0045] S632. Adjust the ambient temperature to the target temperature, charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy changes during the charging of the battery pack under test.

[0046] S633. Stand still.

[0047] S634. Discharge according to the discharging strategy of the battery pack under test, and record the temperature rise, discharging capacity, and energy changes during the discharging of the battery pack under test.

[0048] Further, S6 also includes:

[0049] S64. Conduct thermal management tests under driving - fast charging conditions, including the following steps:

[0050] S641. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test with a current of the rated current until the cut-off voltage;

[0051] S642. Charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test;

[0052] S643. Adjust the ambient temperature to the target temperature, discharge according to the discharge strategy of the battery pack under test, and record the temperature rise, discharge capacity, and energy change during the discharge of the battery pack under test;

[0053] S644. Stand still;

[0054] S645. Charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test.

[0055] Furthermore, S6 further includes:

[0056] S65. Conduct a fast charging - driving - fast charging working condition thermal management test, including the following steps:

[0057] S651. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test with a current of the rated current until the cut-off voltage;

[0058] S652. Adjust the ambient temperature to the target temperature, charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy during the charging of the battery pack under test;

[0059] S653. Stand still;

[0060] S654. Discharge according to the discharge strategy of the battery pack under test, and record the temperature rise, discharge capacity, and energy change during the discharge of the battery pack under test;

[0061] S655. Stand still;

[0062] S656. Charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test.

[0063] Furthermore, S6 further includes:

[0064] S66. Conduct a driving - fast charging - driving working condition thermal management test, including the following steps:

[0065] S661. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test with a current of the rated current until the cut-off voltage;

[0066] S662. Charge according to the fast charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test;

[0067] S663. Adjust the ambient temperature to the target temperature, discharge according to the discharge strategy of the battery pack under test, and record the temperature rise, discharge capacity, and energy change during the discharge of the battery pack under test.

[0068] S664. Stand still.

[0069] S665. Charge according to the fast charge strategy of the battery pack under test, and record the temperature rise, charge capacity, and energy change during the charging of the battery pack under test.

[0070] S666. Stand still.

[0071] S667. Discharge according to the fast charge strategy of the battery pack under test, and record the temperature rise, charge capacity, and energy change during the discharge of the battery pack under test.

[0072] Furthermore, step S6 further includes:

[0073] S67. Conduct a heat management test for the heating - charging condition, including the following steps:

[0074] S671. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test with a current of the rated current until the cut - off voltage.

[0075] S672. Adjust the ambient temperature to the target temperature, turn on the heating strategy, specifically heat the battery pack under test to the first charging temperature through the heating harness, continuously charge and heat until the second charging temperature, then turn off the heating and continue charging until the cut - off voltage.

[0076] S673. Record the heating time for the battery pack under test to reach the charging temperature, the charging time of the battery pack under test, the capacity, and the energy.

[0077] Furthermore, step S6 further includes:

[0078] S68. Conduct a heat management test for the driving - heating condition, including the following steps:

[0079] S681. Set the ambient temperature to the standard test temperature, and discharge the battery pack under test with a current of the rated current until the cut - off voltage.

[0080] S682. Let the battery pack under test adapt to the ambient temperature of the standard test temperature, specifically let the battery pack under test stand still until all the built - in temperature sensors of the battery pack under test reach the standard test temperature.

[0081] S683. Charge according to the fast charge strategy of the battery pack under test, and record the temperature rise, charge capacity, and energy change during the charging of the battery pack under test.

[0082] S684. Adjust the ambient temperature to the target temperature, activate the heating strategy, discharge the battery pack under test until it reaches the optimal discharge temperature, then turn off the heating, and record the heating time, discharge time, capacity, and energy of the battery pack under test when it reaches the optimal temperature.

[0083] Further, step S6 further includes:

[0084] S69. Conduct a heat management test under the heat preservation condition, including the following steps:

[0085] S691. Set the ambient temperature to the standard test temperature to enable the battery pack under test to adapt to the ambient temperature of the standard test temperature. Specifically, let the battery pack under test stand still until all the built-in temperature sensors of the battery pack under test reach the standard test temperature;

[0086] S692. Adjust the ambient temperature to the target temperature, and record the temperature rise change and temperature rise time of the battery pack under test.

[0087] The advantages of the present invention are as follows:

[0088] (1) The power battery heat management test device provided by the present invention can simulate the installation environment of the battery pack in different vehicle models to meet the requirements of different vehicle models; by setting a movable plate on the bottom plate, the hollow area of the bottom plate can be adjusted, improving the cooperation between the support and the hollow holes of the bottom plate, which can increase the bottom air intake area of the battery pack. The peripheral wiring harness of the battery pack installed in the cavity is routed through the wire passing holes provided on the upper cover, and the redundant wire passing holes can be sealed with silicone plugs, which is consistent with the actual installation condition of the battery pack, greatly improving the reduction degree between the laboratory test environment and the actual application environment of the battery system, and improving the accuracy of the battery heat management test results.

[0089] (2) The present invention provides a power battery heat management test method that can simulate the actual working conditions of the whole vehicle, and provides a standardized heat management test scheme under multiple composite scenarios, providing a means for horizontal comparison of the heat management performance of different battery packs, covering complex dynamic working conditions, effectively improving the accuracy of the heat management test results under dynamic working conditions, providing a reliable basis for optimizing the heat management strategy of the battery pack, facilitating reducing the R & D cycle of the whole vehicle, reducing the risk of heat management failure of the whole vehicle, and improving the competitiveness of power battery products.

[0090] (3) Through the simulation of the actual operating environment of the battery system in the whole vehicle, the present invention can achieve a relatively accurate heat management test only in the laboratory environment, can optimize the heat management strategy of the power battery system, and reduce the risk of overheating of the battery pack.

[0091] (4) The present invention designs a heat management test for the charging condition, aiming to maximize the charging capacity of the power battery during the charging condition, reduce the charging waiting time, improve the user experience, and improve the product competitiveness.

[0092] (5) The present invention designs the thermal management test under the charging condition, aiming to keep the battery system within a relatively large output power range as much as possible during the discharging condition of the power battery, reduce the risk of the whole vehicle being EV limited, and further avoid the stall of the battery pack. Description of the Drawings

[0093] Figure 1 is the overall schematic diagram of the power battery thermal management test device in the first embodiment of the present invention;

[0094] Figure 2 is the overall schematic diagram of the bottom plate in the first embodiment of the present invention;

[0095] Figure 3 is Figure 2 the enlarged schematic diagram at A of

[0096] Figure 4 the overall structure diagram of the power battery thermal management test system in the second embodiment of the present invention;

[0097] Figure 5 is the flow chart of the power battery thermal management test method in the third embodiment of the present invention;

[0098] Figure 6 is the battery pack temperature trend diagram under the high-temperature charge-discharge temperature difference condition in the third embodiment of the present invention;

[0099] Figure 7 is the battery pack temperature trend diagram under the high-temperature discharge temperature rise condition in the third embodiment of the present invention;

[0100] Figure 8 is the battery pack temperature trend diagram under the low-temperature heat preservation condition in the third embodiment of the present invention;

[0101] Reference numerals: 10, bottom plate; 11, movable plate; 12, support rod; 13, support base; 14, wind baffle;

[0102] 20, lifting support; 30, upper cover; 31, wire passing hole; 32, handle. Detailed Embodiments

[0103] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0104] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments:

[0105] Example 1

[0106] As Figures 1 to 2 shown, specifically, a power battery thermal management test device is disclosed, which includes a bottom plate 10, a lifting support 20 and an upper cover 30; the lifting support 20 is arranged on the upper surface of the bottom plate 10, the lifting support 20 is used to carry the battery pack, the upper cover 30 is also arranged on the upper surface of the bottom plate 10 and forms a cavity with the bottom plate 10, the upper cover 30 is used to cover the lifting support 20 and the battery pack, and a plurality of hollow holes are arranged on the surface of the bottom plate 10, and the hollow area of the bottom plate 10 is adjustable;

[0107] In this embodiment, a plurality of movable plates 11 are further arranged on the bottom plate 10. The size of the movable plate 11 is the same as that of the hollow hole and is used to close the hollow hole. According to the size of different battery packs and the special requirements of different vehicle models (for example, when the battery pack is applied to commercial vehicle models such as heavy trucks or buses, all the hollow holes need to be closed), the hollow area to be adjusted is confirmed, and the movable plate 11 is used to close the hollow hole to increase or decrease the hollow area of the bottom plate 10, so as to simulate the situation of the battery pack of the target vehicle model installed on the whole vehicle.

[0108] Furthermore, a support rod 12 is arranged between adjacent hollow holes for separating the hollow holes and supporting the bottom plate 10.

[0109] As Figure 2 shown, the left hollow hole of the bottom plate 10 is closed by the movable plate 11, and the right hollow hole is not closed. A plurality of hollow holes are arranged in parallel on the bottom plate 10 surrounded by the lifting support 20, and the hollow holes are separated by the support rod 12. The areas of the respective hollow holes may not be exactly the same to simulate the battery pack sizes of different vehicle models.

[0110] Furthermore, a support base 13 is fixedly connected to the lower surface of the bottom plate 10, and windshields 14 are arranged on any two side edges of the bottom plate 10, and the windshields 14 extend along the lower surface direction of the bottom plate 10. The support base 13 is a steel base and is connected to the lower surface of the bottom plate 10 through a plurality of fixing bolts. The fixing bolts are made of plastic material to achieve the purpose of insulation and heat insulation.

[0111] Furthermore, the movable plate 11 is composed of a composite of a support material and a heat insulation material. Specifically, the support material includes but is not limited to bakelite, and the heat insulation material includes but is not limited to XPS (extruded polystyrene board). The movable plate 11 is formed by combining bakelite, XPS, and bakelite in sequence.

[0112] Further, the lifting support 20 is composed of four support beams that are sequentially slidably connected end to end. A guide rail is provided in the middle of each support beam, and a slider is installed at the head of each support beam. The slider is slidably arranged in the guide rail at the tail of the adjacent support beam. The lifting support 20 adjusts the size of the entire lifting support 20 by adjusting the position of the slider of each support beam in the slide rail of the adjacent support beam.

[0113] Further, the support beam is made of aluminum material, and the bottom of the support beam is composed of a composite of a support material and a thermal insulation material. Specifically, bakelite, XPS, and bakelite are sequentially arranged at the bottom of the support beam.

[0114] In this embodiment, the lifting support 20 can increase the bottom air intake area of the battery pack to meet the actual vehicle conditions, and can also adjust the size of the lifting support 20 according to the sizes of different battery packs.

[0115] In this embodiment, a plurality of wire passing holes 31 are provided on both sides of the upper cover 30. The wire passing holes 31 are used to install high-voltage and low-voltage wire harnesses, direct cooling or liquid cooling pipes. For the special requirements of different vehicle models (such as when the battery pack is applied to commercial vehicle models such as heavy trucks or buses, all the hollow holes need to be closed), the unused wire passing holes 31 are closed by silicone plugs. The upper cover 30 covers the lifting support 20 and the battery pack to form a closed cavity. In this embodiment, the heat insulation ability of the battery pack in a low-temperature or high-temperature environment can also be tested for the thermal management test system by completely closing the bottom plate 10 with the movable plate 11, covering the lifting support 20 and the battery pack with the upper cover 30, and closing the wire passing holes 31 with silicone plugs.

[0116] Further, a handle 32 is also provided on the top of the upper cover 30, which facilitates the separation of the upper cover 30 from the bottom plate 10.

[0117] The power battery thermal management test device provided in this embodiment can simulate the installation environment of the battery pack in different vehicle models. By setting the bottom plate 10 to carry the lifting support 20, the movable plate 11 provided on the bottom plate 10 can adjust the hollow area of the bottom plate 10 to simulate the situation of the battery pack of the target vehicle model installed on the vehicle; by using the lifting support 20 to carry the battery pack, the sizes of different battery packs can be adjusted. At the same time, the lifting support 20 cooperates with the hollow holes of the bottom plate 10, which can increase the bottom air intake area of the battery pack to meet the actual vehicle conditions; by installing high-voltage and low-voltage wire harnesses, direct cooling or liquid cooling pipes for the battery pack in the cavity through the wire passing holes 31 provided on the upper cover 30, the redundant wire passing holes 31 can be closed by silicone plugs, which is consistent with the actual installation conditions of the battery pack, and provides conditions for a variety of test conditions, greatly improving the reduction degree between the laboratory test environment and the actual application environment of the battery system, and improving the practical physical significance of the test results.

[0118] Embodiment Two

[0119] As shown Figure 3 in the figure, the present invention also discloses a power battery thermal management test system, which includes an environmental test chamber, a DC power supply device, a liquid cooling device, a charge and discharge cabinet, and a host computer.

[0120] The environmental test chamber includes a fan, a battery pack, and the power battery thermal management test device in the first embodiment; the fan is used to simulate the additional heat dissipation assistance brought by the wind speed during driving, and the fan speed is confirmed according to the vehicle condition speed measurement; the battery pack is placed in the cavity of the power battery thermal management test device, and different actual vehicle conditions are simulated for the battery pack through the environmental test chamber.

[0121] Figure 3 The layout of the typical power battery thermal management test equipment provided in this embodiment can verify various thermal management condition designs such as liquid cooling and heating, heat and cold electric heating, electric heating natural cooling, and direct cooling electric heating according to the actual configuration of the thermal management test system.

[0122] Furthermore, the charge and discharge cabinet is connected to the battery pack through a high-voltage wire, and a high-voltage charging current is provided to the battery pack through the high-voltage wire for charging the battery pack. It can also be used to transfer the high-voltage current from the battery pack to the charge and discharge cabinet through the high-voltage wire when the battery pack discharges; the charge and discharge cabinet is also connected to the battery pack through a heating wire harness. Specifically, the charge and discharge cabinet is connected to an independent heating device on the battery pack through an external heating wire harness power supply wire. The independent heating device can be a heating film or a PTC heater. The independent heating device can be set inside the battery pack (between the battery cells) or on the surface of the battery pack (on the module housing of the battery pack or the housing of the battery pack).

[0123] Furthermore, the equipment water outlet and the equipment water return port of the liquid cooling device are respectively connected to the battery pack water inlet and the battery pack water outlet of the battery pack. When the battery pack is in a low-temperature state, the liquid cooling device heats the battery pack. In this embodiment, it is set that the heating function is started when the temperature of the battery pack is below 10°C; when the battery pack is in a high-temperature state, the liquid cooling device cools the battery pack. In this embodiment, it is set that the cooling function is started when the temperature of the battery pack is above 35°C.

[0124] In this embodiment, the liquid cooling device is specifically a water chiller.

[0125] Furthermore, the host computer adopts a CAN bus communication protocol. After the CAN-H (high-level signal wire), CAN-L (low-level signal wire) of the host computer, the CAN-H and CAN-L of the charge and discharge cabinet, the positive and negative poles of the DC power supply device are connected together, they are connected to the communication interface of the battery pack through a low-voltage wire harness; the host computer is used to monitor the state of the battery pack and communicate with the charge and discharge cabinet and the environmental test chamber through the CAN bus.

[0126] In this embodiment, the host computer is specifically a computer.

[0127] In this embodiment, the DC power supply device is a 12VDC power supply. The positive and negative poles of the DC power supply device are connected to the battery pack through a low-voltage wiring harness, and are used to provide a low-voltage driving current for the battery management system (BMS) integrated on the battery pack.

[0128] Embodiment III

[0129] As Figure 4 shown, the present invention also discloses a method for testing the thermal management of a power battery, including the following steps:

[0130] S1. Set up a test bench, specifically, install the power battery thermal management test system in Embodiment II, and adjust the hollow area of the power battery thermal management test device in Embodiment I according to the size of the battery pack to be tested. The specific size of the hollow area is specifically adjusted according to the size of the battery pack to be tested, and is used to simulate the situation of the battery pack installed on the vehicle.

[0131] In this embodiment, in order to simulate the situation of the battery pack installed on the vehicle, the hollow area of the power battery thermal management test device is adjusted according to the size of the battery pack to be tested, and the movable plate is used to increase or decrease the hollow area of the bottom plate; when the battery pack is applied to commercial vehicles such as heavy trucks or buses, all the hollow areas need to be closed, and at this time, the hollow holes of the bottom plate are completely closed by the movable plate.

[0132] S2. Arrange external temperature sensors to monitor the temperature of the single cells and high-voltage components of the battery pack to be tested.

[0133] Generally, the number of built-in temperature sensors in the battery pack is not enough to monitor the heat generation situation of the entire battery pack. In this embodiment, external temperature sensors are additionally arranged according to the actual test working condition requirements to monitor the temperature of the single cells and high-voltage components (such as current bars, BDU, etc.) of the battery pack to be tested. The external temperature sensors are obtained through temperature simulation, and the specific positions where the external temperature sensors are arranged can be inside or outside the power battery thermal management test device, and are used to monitor the temperature change situation of the battery pack as much as possible; in addition, by comparing the monitoring data of the external temperature sensors with the data of the built-in temperature sensors of the battery pack to be tested, it is also possible to judge whether the arrangement of the built-in temperature sensors and the selection of high-voltage components of the battery pack to be tested are reasonable.

[0134] S3. Connect the peripheral wiring harness to the battery pack to be tested through the wire passing holes, and seal the unused wire passing holes; the peripheral wiring harness includes a high-voltage wiring harness, a low-voltage wiring harness, a heating wiring harness, and a cooling pipeline.

[0135] In this embodiment, the battery pack to be tested is placed inside the power battery thermal management test device, placed on the lifting support, the upper cover is closed, and the test device is placed inside the environmental test chamber. According to the actual working conditions of the battery pack to be tested, high-voltage and low-voltage wiring harnesses, heating wiring harnesses, direct cooling or liquid cooling pipes are installed through the wire passing holes on the upper cover. After the battery pack to be tested is installed, the redundant unused wire passing holes are sealed with silicone plugs.

[0136] S4. Pretreat the battery pack to be tested and activate the battery pack to make it reach the optimal working state;

[0137] The specific method of activating the battery pack to make it reach the optimal working state is as follows: Under the standard test temperature conditions, charge according to the test method recommended by the battery supplier or charge at the rated current until the cut-off voltage. After charging, let it stand for at least 30 min, and then discharge at the rated current until the cut-off voltage; Repeat the above operations 2 to 5 times, and the change in the battery pack's power is not more than 3% of the rated power for at least two times.

[0138] In this embodiment, the rated current of the battery pack is 1C, and the standard test temperature is 25 ± 2°C.

[0139] S5. Calibrate the initial capacity and energy of the battery pack to be tested;

[0140] The specific method of calibrating the initial capacity of the battery pack to be tested is as follows: Under the standard test temperature conditions, charge to the cut-off voltage according to the test method recommended by the battery supplier, let it stand until the temperature of the battery pack drops to the standard test temperature or let it stand for at least 12 h, and then discharge at the rated current until the cut-off voltage; Repeat the above operations at least 3 times and take the average value of the discharge capacity and the stored energy of the battery pack.

[0141] S6. Conduct thermal management tests based on different thermal management working conditions;

[0142] The different thermal management working conditions include charging working condition, discharging working condition, fast charging - driving working condition, driving - fast charging working condition, fast charging - driving - fast charging working condition, driving - fast charging - driving working condition, heating - charging, driving - heating and heat preservation working condition.

[0143] In this embodiment, relevant tests are conducted according to the thermal management working conditions of the battery system. The following Table 1 provides 9 thermal management working conditions. According to Table 1 and combined with the actual working condition power spectrum of the battery pack, parameter settings are made for thermal management tests, and corresponding working conditions can be selected for verification according to the actual project situation.

[0144] Table 1 Thermal management working condition classification table

[0145]

[0146] In this embodiment, the specific test steps for working conditions A to I are as follows:

[0147] S61. Conduct thermal management tests under charging conditions, including the following steps:

[0148] S611. Set the ambient temperature to 25 ± 2 °C, and discharge the battery pack to be tested with a current of 1C until the cut-off voltage.

[0149] S612. Adjust the ambient temperature to the target temperature, and charge according to the fast charging strategy of the battery pack to be tested (the specific fast charging strategy is related to the specific vehicle model), and record the temperature rise, charging capacity, and energy change during the charging of the battery pack to be tested.

[0150] In this embodiment, adjusting the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20 °C, -10 °C, 0 °C, 25 °C, or 40 °C in sequence. This embodiment examines whether the temperature rise performance during the charging of the battery pack to be tested at different temperatures meets the design parameter requirements of the battery pack based on the charging conditions.

[0151] In this embodiment, the fast charging strategy is related to the specific vehicle model, and the battery pack should be fully charged when charging according to the fast charging strategy of the battery pack to be tested.

[0152] S62. Conduct thermal management tests under discharging conditions, including the following steps:

[0153] S621. Set the ambient temperature to 25 ± 2 °C, and discharge the battery pack to be tested with a current of 1C until the cut-off voltage.

[0154] S622. Let the battery pack to be tested adapt to the ambient temperature of 25 ± 2 °C, specifically, let the battery pack to be tested stand still until all the built-in temperature sensors of the battery pack to be tested reach 25 ± 2 °C.

[0155] S623. Charge according to the fast charging strategy of the battery pack to be tested.

[0156] S624. Adjust the ambient temperature to the target temperature, and discharge according to the discharging strategy of the battery pack to be tested (the specific fast charging strategy is related to the specific vehicle model), and record the temperature rise, discharging capacity, and energy change during the discharging of the battery pack to be tested.

[0157] In this embodiment, adjusting the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20 °C, -10 °C, 0 °C, 25 °C, or 40 °C in sequence. This embodiment examines whether the temperature rise performance during the discharging of the battery pack to be tested during driving at different temperatures meets the design parameter requirements of the battery pack based on the discharging conditions.

[0158] S63. Conduct thermal management tests under fast charging - driving conditions, including the following steps:

[0159] S631. Set the ambient temperature to 25 ± 2 °C, and discharge the battery pack to be tested with a current of 1C until the cut-off voltage.

[0160] S632. Adjust the ambient temperature to the target temperature, and charge according to the fast charging strategy of the battery pack to be tested (the specific fast charging strategy is related to the specific vehicle model), and record the temperature rise, charging capacity, and energy change of the battery pack to be tested during charging;

[0161] S633. Stand still for 5 min;

[0162] S634. Discharge according to the discharge strategy of the battery pack to be tested, and record the temperature rise, discharge capacity, and energy change of the battery pack to be tested during discharge.

[0163] In this embodiment, the adjustment of the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20°C, -10°C, 0°C, 25°C, or 40°C in sequence. This embodiment examines the continuous discharge capacity of the battery pack after fast charging and whether the temperature rise performance during charging and discharging of the battery pack to be tested during driving at different temperatures meets the design parameter requirements of the battery pack.

[0164] Further, there are two special scenarios in this working condition: (1) When charging the battery pack to be tested with the ambient temperature adjusted to the target temperature of 35°C in S632, after performing S633 and standing still for 5 min, adjust the temperature of the environmental test chamber to 40°C and then perform S634, and discharge the battery pack to be tested, which is used to simulate the discharge of the battery pack in summer after charging at the initial temperature (35°C) and introducing a high-temperature variable (the ambient temperature rises to 40°C); (2) When charging the battery pack to be tested with the ambient temperature adjusted to the target temperature of 0°C in S632, after performing S633 and standing still for 5 min, adjust the temperature of the environmental test chamber to -10°C or -20°C and then perform S634, and discharge the battery pack to be tested, which is used to simulate the discharge of the battery pack in winter after charging.

[0165] S64. Conduct a thermal management test for the driving-fast charging working condition, including the following steps:

[0166] S641. Set the ambient temperature to 25 ± 2°C, and discharge the battery pack to be tested with a current of 1C to the cut-off voltage;

[0167] S642. Charge according to the fast charging strategy of the battery pack to be tested, and record the temperature rise, charging capacity, and energy change of the battery pack to be tested during charging;

[0168] S643. Adjust the ambient temperature to the target temperature, and discharge according to the discharge strategy of the battery pack to be tested, and record the temperature rise, discharge capacity, and energy change of the battery pack to be tested during discharge;

[0169] S644. Stand still for 5 min;

[0170] S645. Charge according to the fast charging strategy of the battery pack to be tested, and record the temperature rise, charging capacity, and energy change of the battery pack to be tested during charging.

[0171] In this embodiment, adjusting the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20°C, -10°C, 0°C, 25°C, or 40°C in sequence. This embodiment examines the fast charging ability of the battery pack after continuous discharge under the driving-fast charging working condition, and simultaneously examines the temperature rise, capacity, energy, etc. of the battery pack during charging.

[0172] Furthermore, there are two special scenarios in this working condition: (1) When the ambient temperature is adjusted to the target temperature of 40°C in S643 and the battery pack under test discharges, after adjusting the temperature of the environmental test chamber to 35°C, then execute S645, and the battery pack under test charges, which is used to simulate charging the battery pack in a garage after discharging in summer; (2) When the ambient temperature is adjusted to the target temperature of -10°C or -20°C in S644 and the battery pack under test discharges, after adjusting the temperature of the environmental test chamber to 0°C, then execute S645, and the battery pack under test charges, which is used to simulate discharging the battery pack after charging in winter and then charging again after discharging in winter.

[0173] S65. Conduct a thermal management test for the fast charging-driving-fast charging working condition, including the following steps:

[0174] S651. Set the ambient temperature to 25 ± 2°C, and discharge the battery pack under test with a current of 1C until the cut-off voltage.

[0175] S652. Adjust the ambient temperature to the target temperature, and charge according to the fast charging strategy of the battery pack under test (the specific fast charging strategy is related to the specific vehicle model), and record the changes in temperature rise, charging capacity, and energy of the battery pack under test during charging.

[0176] S653. Stand still for 5 minutes.

[0177] S654. Discharge according to the discharge strategy of the battery pack under test, and record the changes in temperature rise, discharge capacity, and energy of the battery pack under test during discharge.

[0178] S655. Stand still for 5 minutes.

[0179] S656. Charge according to the fast charging strategy of the battery pack under test, and record the changes in temperature rise, charging capacity, and energy of the battery pack under test during charging.

[0180] In this embodiment, adjusting the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20°C, -10°C, 0°C, 25°C, or 40°C in sequence. Based on the fast charging-driving-fast charging working condition, S65 adds one more fast charging working condition compared to S63, which is used to simulate a more severe working condition of long-time driving on the highway, and examines the continuous discharge ability of the battery pack after fast charging, and whether the temperature rise performance of the battery pack under test during charging and discharging when driving at different temperatures meets the design parameter requirements of the battery pack.

[0181] Further, there are two special scenarios in this working condition: (1) In S652, when the ambient temperature is adjusted to the target temperature of 35°C, the battery pack under test is charged, and after the ambient test chamber temperature is adjusted to 40°C, S654 is executed, and the battery pack under test is discharged to simulate the battery pack charging and then discharging in summer; (2) In S652, when the ambient temperature is adjusted to the target temperature of 0°C, the battery pack under test is charged, and after the ambient test chamber temperature is adjusted to -10°C or -20°C, S654 is executed, and the battery pack under test is discharged to simulate the battery pack charging and then discharging in winter.

[0182] S66. Conduct the thermal management test for the driving - fast charging - driving working condition, including the following steps:

[0183] S661. Set the ambient temperature to 25 ± 2°C, and discharge the battery pack under test with a current of 1C to the cut - off voltage.

[0184] S662. Charge according to the fast - charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test.

[0185] S663. Adjust the ambient temperature to the target temperature, and discharge according to the discharge strategy of the battery pack under test, and record the temperature rise, discharge capacity, and energy change during the discharge of the battery pack under test.

[0186] S664. Stand still for 5 min.

[0187] S665. Charge according to the fast - charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the charging of the battery pack under test.

[0188] S666. Stand still for 5 min.

[0189] S667. Discharge according to the fast - charging strategy of the battery pack under test, and record the temperature rise, charging capacity, and energy change during the discharge of the battery pack under test.

[0190] In this embodiment, the adjustment of the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20°C, -10°C, 0°C, 25°C, or 40°C in sequence. Based on the driving - fast charging - driving working condition, S66 adds one more driving working condition compared to S64, which is used to simulate a more severe high - speed long - time driving working condition, and to investigate the fast - charging ability of the battery pack after continuous discharge and whether the temperature rise performance during charging and discharging of the battery pack under test during driving at different temperatures meets the design parameter requirements of the battery pack.

[0191] Furthermore, there are two special scenarios in this working condition: (1) In S663, when the ambient temperature is adjusted to the target temperature of 40°C, the battery pack under test is discharged. After the environmental test chamber temperature is adjusted to 35°C, S665 is executed, and the battery pack under test is charged to simulate a garage where the battery pack is charged after discharging in summer; (2) In S664, when the ambient temperature is adjusted to the target temperature of -10°C or -20°C, the battery pack under test is discharged. After the environmental test chamber temperature is adjusted to 0°C, S665 is executed, and the battery pack under test is charged to simulate charging after discharging in winter and discharging after charging in winter.

[0192] S67. Conduct a heat management test for the heating - charging working condition, including the following steps:

[0193] S671. Set the ambient temperature to 25 ± 2°C, and discharge the battery pack under test with a current of 1C to the cut - off voltage.

[0194] S672. Adjust the ambient temperature to the target temperature, and turn on the heating strategy. Specifically, heat the battery pack under test to the first charging temperature through the heating harness, continuously charge and heat until the second charging temperature, then turn off the heating and continue charging until the cut - off voltage.

[0195] S673. Record the heating time for the battery pack under test to reach the charging temperature, the charging time of the battery pack under test, the capacity, and the energy.

[0196] In this embodiment, adjusting the ambient temperature to the target temperature specifically means adjusting the ambient temperature to -20°C or -10°C in sequence. This embodiment simulates the situation where the battery pack is heated to the rechargeable temperature and charged at low temperature based on the heating - charging working condition.

[0197] In this embodiment, the first charging temperature is 0°C, and the second charging temperature is 15°C. When the battery pack under test exceeds 15°C, only charging is required without heating.

[0198] S68. Conduct a heat management test for the driving - heating working condition, including the following steps:

[0199] S681. Set the ambient temperature to 25 ± 2°C, and discharge the battery pack under test with a current of 1C to the cut - off voltage.

[0200] S682. Let the battery pack under test adapt to the ambient temperature of 25 ± 2°C, specifically, let the battery pack under test stand still until all the built - in temperature sensors of the battery pack under test reach 25 ± 2°C.

[0201] S683. Charge according to the fast - charge strategy of the battery pack under test, and record the temperature rise, changes in charging capacity, and energy during the charging of the battery pack under test.

[0202] S684. Adjust the ambient temperature to the target temperature, activate the heating strategy, discharge the battery pack under test until it reaches the optimal temperature for discharging, then turn off the heating, and record the heating time, discharging time, capacity, and energy of the battery pack under test when it reaches the optimal temperature.

[0203] In this embodiment, the adjustment of the ambient temperature to the target temperature specifically means adjusting the ambient temperature successively to -20°C, -10°C, or the lowest operating temperature of the battery pack. This embodiment is based on the driving-heating working condition to simulate the discharging of the battery pack at low temperatures while heating the battery pack to quickly reach the optimal temperature range of the battery.

[0204] In this embodiment, the optimal temperature range is 15 - 35°C, and the optimal temperature for discharging can be any temperature within 15 - 35°C.

[0205] S69. Conduct the thermal management test for the heat preservation working condition, including the following steps:

[0206] S691. Set the ambient temperature to 25 ± 2°C, and let the battery pack under test adapt to the ambient temperature of 25 ± 2°C. Specifically, the battery pack under test is left stationary until all the built-in temperature sensors of the battery pack under test reach 25 ± 2°C.

[0207] S692. Adjust the ambient temperature to the target temperature, and record the temperature rise change and temperature rise time of the battery pack under test.

[0208] In this embodiment, the adjustment of the ambient temperature to the target temperature specifically means adjusting the ambient temperature successively to -20°C, -10°C, 0°C, 25°C, 40°C, or the highest operating temperature of the battery pack. This embodiment is based on the heat preservation working condition to verify the heat preservation ability of the battery pack at high and low temperatures.

[0209] Furthermore, when performing the above thermal management test, according to the vehicle's overall thermal management strategy, the cooling or heating strategy should be activated as required, and it should be examined whether the battery pack meets the design requirements under the thermal management working condition.

[0210] Furthermore, in this embodiment, a fan can be activated during the driving working condition to simulate the additional heat dissipation assistance brought by the wind speed during driving, and the wind speed of the fan is confirmed according to the vehicle's working condition speed measurement.

[0211] S7. After the thermal management test is completed, remove the test bench.

[0212] In this embodiment, the following Table 2 shows the actual application situation of a certain project A under some thermal management working conditions:

[0213] Table 2 Measured data table of the application of the simulated vehicle's overall thermal management tooling

[0214]

[0215] As Figures 5 to 7Corresponding to the three working conditions in Table 2 above, the temperature rise change trends of the battery pack over time during actual vehicle measurement, without a thermal management device in the laboratory, and with a thermal management device in the laboratory of this embodiment are shown. Among them, serial number 1 corresponds to the thermal management tests for the charging and discharging conditions in steps 61 and 62, serial number 2 corresponds to the thermal management test for the discharging condition in step 62, and serial number 3 corresponds to the thermal management test for the heat preservation condition in step S69.

[0216] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A power battery thermal management test device, characterized in that: include: A bottom plate, wherein a plurality of hollow holes are arranged on the surface of the bottom plate, and the hollow area of ​​the bottom plate is adjustable; A lifting support, the lifting support is arranged on the upper surface of the bottom plate, and the lifting support is used to carry the battery pack; The upper cover is arranged on the upper surface of the bottom plate and forms a cavity with the bottom plate that can cover the lifting support. A plurality of wire holes are arranged on both sides of the upper cover, and the wire holes of the upper cover can be closed by setting silicone plugs.

2. A power battery thermal management test device according to claim 1, characterized in that: The bottom plate is provided with a plurality of movable plates, the size of the movable plates is the same as the hollow holes, and the bottom plate closes the hollow holes through the movable plates to adjust the hollow area of ​​the bottom plate.

3. A power battery thermal management test system, characterized in that: include: An environmental test chamber, the environmental test chamber comprising the power battery thermal management test device according to any one of claims 1 to 2, a fan, and a battery pack; the battery pack is placed in the cavity of the power battery thermal management test device to simulate different actual working conditions of the whole vehicle; A DC power supply device, wherein the positive and negative electrodes of the DC power supply device are connected to the battery pack via a low-voltage wiring harness; A liquid cooling device, wherein an equipment water outlet and an equipment water return outlet of the liquid cooling device are respectively connected to a battery pack water inlet and a battery pack water outlet of the battery pack; A charging and discharging cabinet, which is connected to the battery pack via a high-voltage line to provide a high-voltage charging current to the battery pack; the charging and discharging cabinet is also connected to the battery via a heating harness; The host computer is connected to the charging and discharging cabinet and the environmental test box through a CAN bus.

4. A power battery thermal management test method, characterized in that: The following steps are involved: S1. Equipped with the power battery thermal management test system as described in claim 3 above, adjusting the hollow area of ​​the power battery thermal management test device according to the size of the battery pack to be tested; S2. Arrange an external temperature sensor to monitor the temperature of the single cells and high-voltage components of the battery pack to be tested; S3. Connect the battery pack to the peripheral wiring harness through the wire holes, and close the unused wire holes. S4, pre-processing the battery pack to be tested, activating the battery pack to make it reach the best working state; S5. Calibrate the initial capacity and energy of the battery pack to be tested; S6. Perform thermal management tests based on different thermal management conditions; wherein the different thermal management conditions include charging conditions, discharging conditions, fast charging-driving conditions, driving-fast charging conditions, fast charging-driving-fast charging conditions, driving-fast charging-driving conditions, heating-charging, driving-heating and insulation conditions; S7. After the thermal management test is completed, the test bench is dismantled.

5. A power battery thermal management test method according to claim 4, characterized in that: Activating the battery pack in S4 to achieve its optimal working state is specifically as follows: under standard test temperature conditions, charging according to the test method recommended by the battery supplier, or charging to the cut-off voltage at the rated current, leaving it to stand after charging, and then discharging to the cut-off voltage at the rated current; repeating the above operations multiple times until the cut-off condition is met.

6. A power battery thermal management test method according to claim 4, characterized in that: The S6 includes: S61, performing a charging condition thermal management test, including the following steps: S611, setting the ambient temperature to the standard test temperature, and discharging the battery pack to be tested to the cut-off voltage using the rated current; S612, adjusting the ambient temperature to the target temperature, charging the battery pack under test according to the fast charging strategy, and recording the temperature rise, charging capacity, and energy changes of the battery pack under test during charging.

7. A power battery thermal management test method according to claim 6, characterized in that: The S6 further includes: S62, performing a discharge condition thermal management test, including the following steps: S621, setting the ambient temperature to the standard test temperature, and discharging the battery pack to be tested to a cut-off voltage using a rated current; S622, allowing the battery pack to be tested to adapt to the ambient temperature of the standard test temperature, specifically, allowing the battery pack to be tested to stand still until all built-in temperature sensors of the battery pack to be tested reach the standard test temperature; S623, charging according to the fast charging strategy of the battery pack to be tested; S624, adjusting the ambient temperature to the target temperature, discharging the battery pack under test according to the discharge strategy of the battery pack under test, and recording the temperature rise, discharge capacity, and energy changes of the battery pack under test during discharge.

8. A power battery thermal management test method according to claim 7, characterized in that: The S6 further includes: S63. Perform a fast charging-driving condition thermal management test, including the following steps: S631, setting the ambient temperature to the standard test temperature, and discharging the battery pack to be tested to a cut-off voltage using a rated current; S632, adjusting the ambient temperature to the target temperature, charging the battery pack under test according to the fast charging strategy, and recording the temperature rise, charging capacity, and energy changes of the battery pack under test during charging; S633, let stand; S634, discharging the battery pack under test according to the discharge strategy of the battery pack under test, and recording the temperature rise, discharge capacity, and energy changes of the battery pack under test during discharge.

9. A power battery thermal management test method according to claim 8, characterized in that: The S6 further includes: S64. Perform a driving-fast charging thermal management test, including the following steps: S641, setting the ambient temperature to the standard test temperature, and discharging the battery pack to be tested to a cut-off voltage using a rated current; S642, charging the battery pack to be tested according to the fast charging strategy, and recording the temperature rise, charging capacity, and energy changes of the battery pack to be tested during charging; S643, adjusting the ambient temperature to the target temperature, discharging the battery pack under test according to the discharge strategy, and recording the temperature rise, discharge capacity, and energy changes of the battery pack under test during discharge; S644, let stand; S645. Charge the battery pack under test according to the fast charging strategy, and record the temperature rise, charging capacity, and energy changes of the battery pack under test during charging.

10. A power battery thermal management test method according to claim 9, characterized in that: The S6 further includes: S65. Perform a fast charging-driving-fast charging condition thermal management test, including the following steps: S651, setting the ambient temperature to the standard test temperature, and discharging the battery pack to be tested to a cut-off voltage using a rated current; S652, adjusting the ambient temperature to the target temperature, charging the battery pack under test according to the fast charging strategy, and recording the temperature rise, charging capacity, and energy of the battery pack under test during charging; S653, let stand; S654, discharging the battery pack under test according to the discharge strategy, and recording the temperature rise, discharge capacity, and energy changes of the battery pack under test during discharge; S655, let stand; S656. Charge the battery pack under test according to the fast charging strategy, and record the temperature rise, charging capacity, and energy changes of the battery pack under test during charging.

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