Thermal management test system of power battery, control method and computer equipment

Abstract

The embodiment of the invention discloses a thermal management test system of a power battery, a control method and computer equipment, and belongs to the technical field of new energy. The system comprises charging and discharging equipment, refrigeration equipment, a battery pack, a circulating pipeline and a controller, wherein the battery pack, the circulating pipeline and the controller are arranged in a temperature box; the refrigeration equipment comprises a heat exchanger; wherein the battery pack is electrically connected with the charging and discharging equipment, and the circulating pipeline flows through the battery pack and a heat exchanger in the refrigeration equipment; the charging and discharging equipment is used for charging and discharging the battery pack in a thermal management test process, and the thermal management test comprises a cooling test, a heating test and a uniform temperature test; the controller is used for controlling the circulation pipeline to exchange heat with the refrigeration equipment in the cooling test process; and the controller is also used for controlling the circulation pipeline not to exchange heat with the refrigeration equipment in the heating test and uniform temperature test processes. By adopting the scheme provided by the embodiment of the invention, the thermal management test effect of the power battery can be optimized.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of new energy technology, and in particular to a thermal management test system, a control method, and a computer device for a power battery. Background Art

[0002] With the increasing development of social economy, energy demand has further increased, the call for new energy technology has become louder and louder, and the development of electric vehicles has become an inevitable trend. As the core part of electric vehicles, the performance and service life of batteries directly determine the performance and cost of electric vehicles.

[0003] During the development of the battery system, the operating conditions of the entire vehicle will be simulated, and thermal management tests will be carried out on the bench to verify the test. While the battery pack is charging and discharging, the circulating medium will be used to cool or heat the battery pack.

[0004] In the related technology, the battery pack is placed in a temperature box, electrically connected to the charging and discharging equipment, and connected to the cold and hot water equipment through a circulation pipeline. At the beginning of the test, the charging and discharging equipment is started, and the cold and hot water equipment is started at the same time, and circulating antifreeze is provided to the battery pack through the circulation pipeline. That is, the cold and hot water equipment is used for cooling and heating tests at the same time, which is different from the thermal management process of the battery pack when the actual vehicle is running, resulting in poor thermal management test results. Summary of the invention

[0005] The present application example provides a thermal management test system, a control method and a computer device for a power battery, and the technical solution is as follows.

[0006] On the one hand, an embodiment of the present application provides a thermal management test system for a power battery, the system comprising a charging and discharging device, a refrigeration device, and a battery pack, a circulation pipeline, and a controller placed in a temperature box, the refrigeration device comprising a heat exchanger;

[0007] Wherein, the battery pack is electrically connected to the charging and discharging device, and the circulation pipeline flows through the battery pack and the heat exchanger in the refrigeration device;

[0008] The charging and discharging equipment is used to charge and discharge the battery pack during a thermal management test, wherein the thermal management test includes a cooling test, a heating test, and a temperature equalization test;

[0009] The controller is used to control the circulation pipeline to perform heat exchange with the refrigeration equipment during the cooling test;

[0010] The controller is also used to control the circulation pipeline not to perform heat exchange with the refrigeration equipment during the heating test and the temperature equalization test.

[0011] On the other hand, an embodiment of the present application provides a control method, which is used in a thermal management test system for a power battery, wherein the system includes a charging and discharging device, a refrigeration device, a battery pack placed in a temperature box, a circulation pipeline, and a controller, wherein the refrigeration device includes a heat exchanger;

[0012] Wherein, the battery pack is electrically connected to the charging and discharging device, and the circulation pipeline flows through the battery pack and the heat exchanger in the refrigeration device;

[0013] The method comprises:

[0014] During the thermal management test, the battery pack is charged and discharged by the charging and discharging equipment, and the thermal management test includes a cooling test, a heating test, and a temperature equalization test;

[0015] During the cooling test, the controller controls the circulation pipeline to perform heat exchange with the refrigeration equipment;

[0016] During the heating test and the temperature equalization test, the controller controls the circulation pipeline not to perform heat exchange with the refrigeration equipment.

[0017] On the other hand, an embodiment of the present application provides a computer device, which includes a processor and a memory; the memory stores at least one computer instruction, and the at least one computer instruction is used to be executed by the processor to implement the control method described in the above aspect.

[0018] In the embodiment of the present application, during the thermal management test of the power battery, in order to make the thermal management test process closer to the actual battery thermal management process during vehicle operation, the cooling test and the heating test are separated. Therefore, during the cooling test, the circulation pipeline is controlled by the controller to exchange heat with the refrigeration equipment, while during the heating test, the circulation pipeline does not need to exchange heat with the refrigeration equipment, but the circulation pipeline is directly heated by the heater, thereby improving the thermal management test efficiency and optimizing the thermal management test effect of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The structure block diagram of the thermal management test system of the power battery in the related art is shown;

[0021] Figure 2 A structural block diagram of a thermal management test system for a power battery provided by an exemplary embodiment of the present application is shown;

[0022] Figure 3 A structural block diagram of a thermal management test system for a power battery provided by another exemplary embodiment of the present application is shown;

[0023] Figure 4 A schematic diagram showing the flow direction of a circulating medium in a circulating pipeline during a cooling test provided by an exemplary embodiment of the present application;

[0024] Figure 5 A schematic diagram showing the flow direction of a circulating medium in a circulating pipeline during a heating test provided by an exemplary embodiment of the present application;

[0025] Figure 6 A schematic diagram showing the flow direction of a circulating medium in a circulating pipeline during a temperature equalization test provided by an exemplary embodiment of the present application;

[0026] Figure 7 A flow chart of a control method provided by an exemplary embodiment of the present application is shown;

[0027] Figure 8 A schematic diagram showing a computer device controlling a thermal management test system provided by an exemplary embodiment of the present application is shown;

[0028] Fig. 9 A schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0032] It should be understood that, although the terms first, second, etc. may be used in the present application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first parameter may also be referred to as the second parameter, and similarly, the second parameter may also be referred to as the first parameter. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0033] First, the nouns involved in the embodiments of the present application are briefly introduced:

[0034] Power battery: It is the core component of electric vehicles, responsible for storing and providing energy to drive the motor. The main features of power batteries include high energy density, high power density, long cycle life and wide operating temperature range. These characteristics enable power batteries to provide high power in a short time, meet the high power requirements of electric vehicles such as acceleration and climbing, and ensure stable operation of the battery in various extreme environments.

[0035] Thermal management test: It is to evaluate the performance and safety of the battery under different temperature conditions and ensure that the battery system can work reliably under various environmental conditions. The purpose of the test is to simulate the thermal behavior in actual vehicle operation, including cooling performance, heating performance, heat preservation performance and temperature equalization performance.

[0036] In the related art, in order to conduct thermal management tests on power batteries, the battery pack is placed in a temperature box, electrically connected to the charging and discharging equipment, and connected to the cold and hot water equipment through a circulation pipeline. Then, at the beginning of the test, the charging and discharging equipment and the cold and hot water equipment are started, and circulating antifreeze is provided to the battery pack through the circulation pipeline.

[0037] Please refer to Figure 1 , which shows a structural block diagram of a thermal management test system for a power battery in the related art. The thermal management test system includes a charging and discharging device 110 , a hot and cold water device 140 , a circulation pipeline 130 , and a battery pack 121 placed in a temperature box 120 .

[0038] When conducting a high-temperature cooling test, the ambient temperature of the battery pack 121 is first adjusted to a high temperature environment (for example, 40°C) through the temperature box 120, and then the antifreeze liquid in the circulation pipeline 130 is cooled by the hot and cold water equipment 140, so that the cooled antifreeze liquid flows to the battery pack 121 through the circulation pipeline 130, thereby cooling the battery pack 121.

[0039] When conducting a low-temperature heating test, the ambient temperature of the battery pack 121 is first adjusted to a low-temperature environment (e.g., -20°C) through the temperature box 120, and then the antifreeze liquid in the circulation pipeline 130 is heated by the hot and cold water equipment 140, so that the heated antifreeze liquid flows to the battery pack 121 through the circulation pipeline 130, thereby achieving heating of the battery pack 121.

[0040] Obviously, in the related art, hot and cold water equipment is directly used to simulate the heating and cooling process of the power battery during the actual operation of the whole vehicle. However, when the whole vehicle is actually running, the heating and cooling processes are not based on the same equipment, but a separate cooling system is used to cool the power battery, and the whole vehicle heater is used to heat the power battery. Therefore, in order to make the thermal management test process closer to the battery thermal management process when the whole vehicle is actually running, in the embodiment of the present application, the cooling test and the heating test are separated, so that during the cooling test, the controller controls the circulation pipeline to exchange heat with the refrigeration equipment, and during the heating test, the circulation pipeline does not need to exchange heat with the refrigeration equipment, but directly uses the heater to heat the circulation pipeline, thereby improving the efficiency of the thermal management test and optimizing the thermal management test effect of the power battery.

[0041] The thermal management test system for the power battery proposed in this application will be described below through specific embodiments.

[0042] Please refer to Figure 2 , which shows a structural block diagram of a thermal management test system for a power battery provided by an exemplary embodiment of the present application.

[0043] like Figure 2 As shown, the thermal management test system includes a charging and discharging device 210 , a cooling device 220 , a battery pack 231 placed in a temperature box 230 , a circulation pipeline 232 , and a controller 233 , and the cooling device 220 includes a heat exchanger 221 .

[0044] The battery pack 231 is electrically connected to the charging and discharging device 210, and the circulation line 232 flows through the battery pack 231 and the heat exchanger 221 in the refrigeration device 220. And because the refrigeration device 220 is close to the temperature box 230, the circulation line 232 will not be exposed to the air too much, which can prevent the circulating medium in the circulation line 232 from being in the room temperature environment before the thermal management test, affecting the thermal management test efficiency.

[0045] The charging and discharging device 210 is used to charge and discharge the battery pack 231 during the thermal management test. The thermal management test includes a cooling test, a heating test, and a temperature equalization test.

[0046] Optionally, in order to simulate the thermal management process of the battery pack during actual vehicle operation, the charging and discharging equipment can be electrically connected to the battery pack. During the thermal management test, the battery pack is charged and discharged through the charging and discharging equipment, thereby simulating the temperature changes of the battery pack during actual vehicle operation, which helps to ensure that the battery pack does not cause safety problems due to overheating during the charging and discharging process.

[0047] Optionally, thermal management tests may include high-temperature cooling tests, low-temperature heating tests, and uniform temperature performance tests. Among them, the high-temperature cooling test simulates the cooling effect of the battery pack in a high-temperature environment to ensure that the battery pack can work normally in a high-temperature environment; the low-temperature heating test simulates the heating effect of the battery pack in a low-temperature environment to ensure that the battery pack can work normally in a low-temperature environment; the uniform temperature performance test is to ensure that the temperature distribution inside the battery pack is uniform to avoid local overheating or overcooling.

[0048] The controller 233 is used to control the circulation pipeline 232 to perform heat exchange with the refrigeration equipment 220 during the cooling test.

[0049] Optionally, in order to perform a high-temperature cooling test on the battery pack and simulate the cooling effect of the battery pack in a high-temperature environment, the circulating medium in the circulating pipeline can be cooled by controlling the heat exchange between the circulating pipeline and the refrigeration equipment, so that the cooled circulating medium flows through the battery pack, thereby achieving cooling of the battery pack.

[0050] Optionally, the circulating medium may be an antifreeze coolant. Optionally, the controller may control the circulation state of the circulating medium in the circulating pipeline so that the circulating medium flows through the heat exchanger in the refrigeration equipment, thereby achieving heat exchange between the circulating medium in the circulating pipeline and the refrigerant in the heat exchanger. Optionally, heat exchange refers to the transfer of heat between the high-temperature circulating medium and the low-temperature refrigerant to reduce the temperature of the circulating medium.

[0051] The controller 233 is also used to control the circulation pipeline 232 not to perform heat exchange with the refrigeration equipment 220 during the heating test and the temperature equalization test.

[0052] Unlike the related art, the heating test of the battery pack is carried out by the hot and cold water equipment outside the temperature box, which is inconsistent with the actual battery pack heating process during the operation of the whole vehicle. In the embodiment of the present application, the heating test and the cooling test are separated, and the heating process no longer relies on the equipment outside the temperature box. Therefore, during the heating test, the controller can control the circulation pipeline not to exchange heat with the refrigeration equipment.

[0053] Optionally, the controller may prevent the circulating medium from flowing through the heat exchanger in the refrigeration equipment by controlling the flow state of the circulating medium in the circulating pipeline, thereby preventing heat exchange between the circulating medium in the circulating pipeline and the refrigerant in the heat exchanger.

[0054] Optionally, considering that the temperature equalization test is to ensure uniform temperature distribution inside the battery pack to avoid local overheating or overcooling, that is, the temperature equalization test process does not require the aid of external equipment, so in order to simulate the temperature equalization process of the battery pack during actual vehicle operation, the controller does not need to control the circulation pipeline to exchange heat with the refrigeration equipment.

[0055] To summarize, in the embodiments of the present application, during the thermal management test of the power battery, in order to make the thermal management test process closer to the actual battery thermal management process during vehicle operation, the cooling test and the heating test are separated. Thus, during the cooling test, the controller controls the circulation pipeline to exchange heat with the refrigeration equipment, while during the heating test, the circulation pipeline does not need to exchange heat with the refrigeration equipment, but the heater is directly used to heat the circulation pipeline, thereby improving the thermal management test efficiency and optimizing the thermal management test effect on the power battery.

[0056] In some embodiments, in order to control the heat exchange state between the circulation pipeline and the refrigeration equipment by controlling the flow state of the circulating medium in the circulation pipeline, the circulation pipeline can be set to an "inverted H shape", that is, the circulation pipeline includes an inlet pipeline, an outlet pipeline and a connecting pipeline, wherein the connecting pipeline is used to connect the water inlet pipeline and the water outlet pipeline.

[0057] Optionally, a solenoid valve group is provided on the circulation pipeline, wherein the solenoid valve group includes a first solenoid valve and a second solenoid valve, wherein the first solenoid valve is located on the water inlet pipeline and close to the refrigeration equipment, and the second solenoid valve is located on the connecting pipeline, so that the controller can control the flow state of the circulating medium in the circulation pipeline by controlling the opening and closing states of the first solenoid valve and the second solenoid valve.

[0058] Optionally, a first heater and a water pump are also provided on the circulation pipeline, wherein the first heater is located in the water inlet pipeline and close to the battery pack, and the water pump is located in the water outlet pipeline and close to the battery pack.

[0059] Please refer to Figure 3 , which shows a structural block diagram of a thermal management test system for a power battery provided by another exemplary embodiment of the present application.

[0060] like Figure 3 As shown, the thermal management test system includes a charging and discharging device 310, a cooling device 320, a battery pack 331 placed in a temperature box 330, a circulation pipeline and a controller 332, and the cooling device 320 includes a heat exchanger 321. The battery pack 331 is electrically connected to the charging and discharging device 310, and the circulation pipeline flows through the battery pack 331 and the heat exchanger 321 in the cooling device 320.

[0061] Schematically, the circulation pipeline includes a water inlet pipeline 333, a water outlet pipeline 334 and a connecting pipeline 335. A first solenoid valve 336 is installed on the side of the water inlet pipeline 333 close to the refrigeration device 320, and a first heater 338 is installed on the side close to the battery pack 331; a second solenoid valve 337 is installed on the connecting pipeline 335; and a water pump 339 is installed on the side of the water outlet pipeline 334 close to the battery pack 331.

[0062] The controller 332 is connected to the first solenoid valve 336 and the second solenoid valve 337, and the controller 332 can control the opening and closing states of the first solenoid valve 336 and the second solenoid valve 337, thereby changing the circulation state of the circulating medium in the circulation pipeline. For example, when the first solenoid valve 336 is in an open state and the second solenoid valve 337 is in a closed state, the circulating medium only circulates between the water inlet pipeline 333 and the water outlet pipeline 334. For another example, when the first solenoid valve 336 is in a closed state and the second solenoid valve 337 is in an open state, the circulating medium circulates between the water inlet pipeline 333, the water outlet pipeline 334 and the connecting pipeline 335, but only flows through the half section of the water inlet pipeline 333 and the water outlet pipeline 334 close to the battery pack 331, and does not flow through the refrigeration equipment 320.

[0063] In some embodiments, in order to perform a high-temperature cooling test on a battery pack, before the cooling test, the test environment temperature of the battery pack and the circulation pipeline can be adjusted to a first target temperature, such as a high temperature of 40° C., by a temperature box.

[0064] Optionally, considering that during actual vehicle operation, when there is a need for high-temperature cooling, the refrigeration equipment is usually also in a high-temperature environment. Therefore, in order to further improve the authenticity of the thermal management test, a second heater can be installed in the heat exchanger, so that the test environment temperature of the heat exchanger can be adjusted to the first target temperature through the second heater.

[0065] Indicatively, Figure 3 As shown, a second heater 322 is installed in the heat exchanger 321, and the second heater 322 is used to adjust the test environment temperature of the heat exchanger 321 to 40°C before the cooling test.

[0066] Furthermore, during the cooling test, the controller may set the first solenoid valve to an open state and the second solenoid valve to a closed state, so that the circulating medium in the circulating pipeline flows through the refrigeration equipment.

[0067] Optionally, in order to achieve heat exchange between the circulation pipeline and the refrigeration device in the heat exchanger and cool the circulating medium in the circulation pipeline, it is necessary to generate a low-temperature refrigerant in the refrigeration device.

[0068] Optionally, the refrigeration device includes a condenser, an expansion valve and a compressor. The refrigeration device can be used to cool the refrigerant medium through the compressor, the condenser and the expansion valve, so that the cooled refrigerant medium flows through the heat exchanger.

[0069] Indicative, such as Figure 3 As shown, the refrigeration device 320 includes a condenser 323, an expansion valve 324 and a compressor 325, and the heat exchanger 321, the condenser 323, the expansion valve 324 and the compressor 325 are connected through a refrigeration cycle pipeline, and a refrigeration medium flows in the refrigeration cycle pipeline. Optionally, the refrigeration medium can be a refrigerant.

[0070] In a possible implementation, in the refrigeration cycle, the compressor compresses the low-pressure and low-temperature refrigerant into high-pressure hot steam and sends it to the condenser. In the condenser, the refrigerant releases heat and changes from gas to high-pressure liquid. When the high-pressure liquid refrigerant passes through the expansion valve, the pressure decreases, and part of the refrigerant evaporates, absorbing heat, so that the refrigerant is further cooled and flows into the heat exchanger.

[0071] Furthermore, since the controller sets the first solenoid valve to an open state and the second solenoid valve to a closed state, the circulating medium in the circulating pipeline can flow through the refrigeration device, so that in the heat exchanger, the circulating medium in the circulating pipeline and the refrigerant medium in the heat exchanger can exchange heat, and the low-temperature refrigerant medium can reduce the temperature of the circulating medium to obtain a cooled circulating medium. Furthermore, the circulating pipeline can cool the battery pack based on the cooled circulating medium.

[0072] Please refer to Figure 4 , which shows a schematic diagram of the flow direction of the circulating medium in the circulating pipeline during the cooling test provided by an exemplary embodiment of the present application. Figure 4 As shown, the circulating medium flows into the battery pack 331 along the water inlet pipe 333, absorbs the heat in the battery pack 331, and the circulating medium with increased temperature flows out from the water outlet pipe 334 and flows to the heat exchanger 321 in the refrigeration equipment, so that the high-temperature circulating medium exchanges heat with the low-temperature refrigeration medium in the heat exchanger to obtain the circulating medium with reduced temperature, and then the circulating medium with reduced temperature flows into the battery pack 331 through the water inlet pipe 333 again, absorbs the heat in the battery pack 331, and circulates in this way to achieve high-temperature cooling of the battery pack 331.

[0073] In some embodiments, in order to perform a low-temperature heating test on a battery pack, before the heating test, the test environment temperature of the battery pack and the circulation pipeline can be adjusted to a second target temperature, such as a low temperature of -20°C, by a temperature box.

[0074] Optionally, during the heating test, no heat exchange is required between the circulation pipeline and the refrigeration equipment. The controller can set the first solenoid valve to a closed state and the second solenoid valve to an open state, thereby disconnecting the heat exchange between the circulation pipeline and the refrigeration equipment, so that the circulating medium flows through the connecting pipeline instead of the refrigeration equipment.

[0075] In a possible implementation, in order to heat the battery pack at low temperature, a first heater can be directly installed on the circulation pipeline in the temperature box. And in order to improve the authenticity of the thermal management test, the model of the first heater can be consistent with the model of the heater actually installed on the vehicle. Furthermore, during the heating test, the circulating medium in the circulation pipeline can be directly heated by the first heater, and the heated circulating medium is sent to the battery pack by the circulation pipeline, and the battery pack is heated based on the heated circulating medium.

[0076] Please refer to Figure 5 , which shows a schematic diagram of the flow direction of the circulating medium in the circulating pipeline during the heating test provided by an exemplary embodiment of the present application. Figure 5 As shown, the circulating medium flows into the battery pack 331 along the water inlet pipe 333. After being absorbed by the battery pack 331 with a lower temperature, the circulating medium with a reduced temperature flows out from the water outlet pipe 334, and flows into the first heater 338 on the water inlet pipe 333 through the connecting pipe 335. The first heater 338 heats the circulating medium to obtain a circulating medium with a raised temperature. Then, the circulating medium with a raised temperature flows into the battery pack 331 through the water inlet pipe 333 again, and is absorbed by the battery pack 331. The circulating medium circulates in this way to achieve low-temperature heating of the battery pack 331.

[0077] Optionally, in order to further optimize the thermal management test process, a water pump can be installed on the circulation pipeline, and in order to take into account both the cooling test process and the heating test process, the water pump can be installed on the circulation pipeline close to the battery pack. For example, the water pump is installed on the water inlet pipeline close to the battery pack, or installed on the water outlet pipeline close to the battery pack.

[0078] In a possible implementation, the flow rate of the circulating medium in the circulation pipeline can be adjusted by a water pump. Optionally, during the heating test, in order to improve the heating efficiency of the battery pack, the duty cycle of the water pump can be adjusted to the maximum, so that the flow rate of the circulating medium in the circulation pipeline is maximized.

[0079] Optionally, in order to simulate the actual situation of the whole vehicle, the model of the water pump can also be consistent with the model of the water pump actually installed on the whole vehicle, that is, the battery pack coolant circulation pump actually used on the whole vehicle.

[0080] Indicatively, Figure 5As shown, the water pump 339 is installed on the water outlet pipeline 334 close to the battery pack 331. By adjusting the duty cycle of the water pump 339, the flow rate of the circulating medium in the circulation pipeline can be adjusted by the water pump 339.

[0081] In some embodiments, in order to make the temperature distribution of the battery pack balanced and improve the performance and service life of the battery pack, a temperature equalization test may be performed on the battery pack.

[0082] Optionally, during the temperature uniformity test, no heat exchange is required between the circulation pipeline and the refrigeration equipment. The controller can set the first solenoid valve to a closed state and the second solenoid valve to an open state, thereby disconnecting the heat exchange between the circulation pipeline and the refrigeration equipment, so that the circulation medium flows through the connecting pipeline instead of the refrigeration equipment.

[0083] Optionally, the circulation pipeline is used to evenly treat the temperature of the battery pack based on the circulation medium. For example, when the temperature distribution inside the battery pack is uneven, the circulation medium can flow through the circulation pipeline inside the battery pack, so that the circulation medium can absorb the heat in the higher temperature area and release the heat in the lower temperature area.

[0084] Please refer to Figure 6 , which shows a schematic diagram of the flow direction of the circulating medium in the circulating pipeline during the temperature uniformity test provided by an exemplary embodiment of the present application. Figure 6 As shown, the circulating medium flows into the battery pack 331 along the water inlet pipe 333, circulates in the battery pack 331, balances the temperature of each area of ​​the battery pack 331, flows out from the water outlet pipe 334, and flows into the water inlet pipe 333 through the connecting pipe 335, and then flows into the battery pack 331 along the water inlet pipe 333, and circulates in this way to achieve uniform temperature treatment of the battery pack 331.

[0085] In a possible implementation, during the temperature equalization test, the flow rate of the circulating medium in the circulation pipeline can also be adjusted by a water pump. For example, when the temperature distribution difference is small, the duty cycle of the water pump can be appropriately reduced to reduce the flow rate of the circulating medium in the circulation pipeline; when the temperature distribution difference is large, the duty cycle of the water pump can be appropriately increased to increase the flow rate of the circulating medium in the circulation pipeline, thereby improving the temperature equalization efficiency.

[0086] Indicative, such as Figure 6 As shown, the water pump 339 is installed on the water outlet pipe 334 close to the battery pack 331. By adjusting the duty cycle of the water pump 339, the flow rate of the circulating medium in the circulation pipeline can be adjusted by the water pump 339, thereby adjusting the efficiency of the temperature equalization treatment.

[0087] In the above embodiment, the cooling test and the heating test are separated. During the cooling test, the circulating medium in the circulation pipeline is cooled by means of a refrigeration device outside the temperature box, so that the battery pack is cooled by the cooled circulating medium. During the heating test, the circulating medium in the circulation pipeline is directly heated by the first heater in the temperature box, so that the battery pack is heated by the heated circulating medium. This makes the thermal management test process closer to the actual thermal management process of the battery during the operation of the whole vehicle, improves the authenticity of the thermal management test, and optimizes the thermal management test effect.

[0088] In addition, an average temperature test is added. During the average temperature test, the battery pack is directly subjected to average temperature treatment using the circulating medium at the current temperature without the need for other equipment outside the temperature chamber. This can make the average temperature test process consistent with the actual average temperature treatment process of the entire vehicle, thereby optimizing the average temperature test process.

[0089] In addition, by setting the first solenoid valve and the second solenoid valve on the circulation pipeline, the controller adjusts the opening and closing states of the solenoid valves according to the test conditions, thereby changing the flow state of the circulating medium in the circulation pipeline, thereby improving the switching efficiency of the pipeline between various test conditions.

[0090] In some embodiments, considering that the thermal management test is to better manage the thermal state of the power battery during the actual operation of the vehicle, a temperature sensor may be added to the thermal management test system. In this way, during each operating condition test, the real-time temperature of the battery pack is collected by the temperature sensor, so that the thermal management test process can be analyzed and optimized according to the collected real-time temperature.

[0091] Optionally, a temperature sensor is installed on the battery pack and is used to collect the real-time temperature of the battery pack. Optionally, in order to more comprehensively understand the temperature of different areas of the battery pack, multiple temperature sensors can also be installed in different areas of the battery pack.

[0092] Optionally, after obtaining the real-time temperature of the battery pack, the water pump can adjust the flow rate of the circulating medium in the circulation pipeline according to the real-time temperature.

[0093] Optionally, the water pump can adjust the flow rate of the circulating medium in the circulation pipeline according to the temperature change rate of the battery pack, so as to determine the circulating medium flow rate suitable for the battery pack during the thermal management test for use in the subsequent actual operation stage of the whole vehicle.

[0094] For example, during the cooling test, when the battery pack temperature is high, the duty cycle of the water pump can be increased to increase the flow rate of the circulating medium in the circulation pipeline; when the battery pack temperature is low, the duty cycle of the water pump can be reduced to appropriately reduce the flow rate of the circulating medium in the circulation pipeline.

[0095] For example, during the temperature equalization test, when the temperature difference inside the battery pack is large, the duty cycle of the water pump can be increased to increase the flow rate of the circulating medium in the circulation pipeline; when the temperature difference inside the battery pack is small, the duty cycle of the water pump can be reduced to appropriately reduce the flow rate of the circulating medium in the circulation pipeline.

[0096] Optionally, during the heating test, the first heater can also control the heating rate of the circulating medium in the circulation pipeline according to the real-time temperature of the battery pack, so as to determine a heating scheme suitable for the battery pack during the heating test for use in the subsequent actual operation stage of the whole vehicle.

[0097] For example, during the heating test, when the battery pack temperature is low, the heating rate of the circulating medium can be increased, thereby increasing the heating rate of the battery pack; when the battery pack temperature is high, the heating rate of the circulating medium can be reduced, thereby reducing the heating rate of the battery pack.

[0098] In the above embodiment, during the thermal management test, the real-time temperature of the battery pack is collected by the temperature sensor, so that the water pump can adjust the flow rate of the circulating medium according to the real-time temperature, and the first heater can control the heating rate of the circulating medium according to the real-time temperature, which further optimizes the thermal management test process. It is also helpful to analyze and determine the thermal management solution suitable for the power battery during the thermal management test process, which is used in the subsequent actual operation process of the whole vehicle, thereby improving the thermal management efficiency of the power battery during the actual operation of the whole vehicle.

[0099] Please refer to Figure 7 , which shows a flow chart of a control method provided by an exemplary embodiment of the present application. The method is used in a thermal management test system for a power battery, the system includes a charging and discharging device, a refrigeration device, a battery pack placed in a temperature box, a circulation pipeline and a controller, the refrigeration device includes a heat exchanger; wherein the battery pack is electrically connected to the charging and discharging device, and the circulation pipeline flows through the battery pack and the heat exchanger in the refrigeration device.

[0100] The method comprises the following steps:

[0101] Step 701, during the thermal management test, the battery pack is charged and discharged by a charging and discharging device.

[0102] Optionally, the thermal management test includes a cooling test, a heating test, and a uniform temperature test.

[0103] Optionally, in order to simulate the thermal management process of the battery pack during actual vehicle operation, the charging and discharging equipment can be electrically connected to the battery pack. During the thermal management test, the battery pack is charged and discharged through the charging and discharging equipment, thereby simulating the temperature changes of the battery pack during actual vehicle operation, which helps to ensure that the battery pack does not cause safety problems due to overheating during the charging and discharging process.

[0104] Optionally, thermal management tests may include high-temperature cooling tests, low-temperature heating tests, and uniform temperature performance tests. Among them, the high-temperature cooling test simulates the cooling effect of the battery pack in a high-temperature environment to ensure that the battery pack can work normally in a high-temperature environment; the low-temperature heating test simulates the heating effect of the battery pack in a low-temperature environment to ensure that the battery pack can work normally in a low-temperature environment; the uniform temperature performance test is to ensure that the temperature distribution inside the battery pack is uniform to avoid local overheating or overcooling.

[0105] Step 702: During the cooling test, the controller controls the circulation pipeline to perform heat exchange with the refrigeration equipment.

[0106] Optionally, in order to perform a high-temperature cooling test on the battery pack and simulate the cooling effect of the battery pack in a high-temperature environment, the circulating medium in the circulating pipeline can be cooled by controlling the heat exchange between the circulating pipeline and the refrigeration equipment, so that the cooled circulating medium flows through the battery pack, thereby achieving cooling of the battery pack.

[0107] Optionally, the controller can control the flow state of the circulating medium in the circulating pipeline so that the circulating medium flows through the heat exchanger in the refrigeration equipment, thereby realizing heat exchange between the circulating medium in the circulating pipeline and the refrigerant in the heat exchanger. Optionally, heat exchange refers to the transfer of heat between the high-temperature circulating medium and the low-temperature refrigerant to reduce the temperature of the circulating medium.

[0108] Step 703: During the heating test and the temperature equalization test, the controller controls the circulation pipeline to not perform heat exchange with the refrigeration equipment.

[0109] Unlike the related art, the heating test of the battery pack is carried out by the hot and cold water equipment outside the temperature box, which is inconsistent with the actual battery pack heating process during the operation of the whole vehicle. In the embodiment of the present application, the heating test and the cooling test are separated, and the heating process no longer relies on the equipment outside the temperature box. Therefore, during the heating test, the controller can control the circulation pipeline not to exchange heat with the refrigeration equipment.

[0110] Optionally, the controller may prevent the circulating medium from flowing through the heat exchanger in the refrigeration equipment by controlling the flow state of the circulating medium in the circulating pipeline, thereby preventing heat exchange between the circulating medium in the circulating pipeline and the refrigerant in the heat exchanger.

[0111] Optionally, considering that the temperature equalization test is to ensure uniform temperature distribution inside the battery pack to avoid local overheating or overcooling, that is, the temperature equalization test process does not require the aid of external equipment, so in order to simulate the temperature equalization process of the battery pack during actual vehicle operation, the controller does not need to control the circulation pipeline to exchange heat with the refrigeration equipment.

[0112] To summarize, in the embodiments of the present application, during the thermal management test of the power battery, in order to make the thermal management test process closer to the actual battery thermal management process during vehicle operation, the cooling test and the heating test are separated. Thus, during the cooling test, the controller controls the circulation pipeline to exchange heat with the refrigeration equipment, while during the heating test, the circulation pipeline does not need to exchange heat with the refrigeration equipment, but the heater is used to heat the circulation pipeline directly, thereby improving the thermal management test efficiency and optimizing the thermal management test effect on the power battery.

[0113] The present application also provides a computer device. Figure 8 , which shows a schematic diagram of a computer device controlling a thermal management test system provided by an exemplary embodiment of the present application.

[0114] Optionally, the computer device 801 may be connected to the temperature box 802 to control the opening and closing states of the temperature box 802 and to set the temperature of the temperature box 802 before the thermal management test.

[0115] Optionally, the computer device 801 may be connected to the first heater 803 to control the on / off state of the first heater 803 and set the heating parameters of the first heater 803 during the heating test.

[0116] Optionally, the computer device may be connected to the refrigeration device 804 to control the on / off state of the refrigeration device 804 and to set the refrigeration parameters of the refrigeration device 804 during the cooling test.

[0117] Optionally, a computer device may be connected to the water pump 805 to set the duty cycle of the water pump 805 .

[0118] Please refer to Fig. 9, which shows a schematic diagram of the structure of a computer device provided by an exemplary embodiment of the present application. Specifically, the computer device 900 includes a central processing unit (CPU) 901, a system memory 904 including a random access memory 902 and a read-only memory 903, and a system bus 905 connecting the system memory 904 and the central processing unit 901. The computer device 900 may also include a basic input / output system (I / O system) 906 that helps transmit information between various devices in the computer, and a large-capacity storage device 907 for storing an operating system 913, application programs 914 and other program modules 915.

[0119] In some embodiments, the basic input / output system 906 includes a display 908 for displaying information and an input device 909 such as a mouse and a keyboard for user inputting information. The display 908 and the input device 909 are connected to the central processing unit 901 through an input / output controller 910 connected to the system bus 905. The basic input / output system 906 may also include an input / output controller 910 for receiving and processing inputs from a plurality of other devices such as a keyboard, a mouse, or an electronic stylus. Similarly, the input / output controller 910 also provides output to a display screen, a printer, or other types of output devices.

[0120] The mass storage device 907 is connected to the central processing unit 901 through a mass storage controller (not shown) connected to the system bus 905. The mass storage device 907 and its associated computer readable media provide non-volatile storage for the computer device 900. That is, the mass storage device 907 may include a computer readable medium (not shown) such as a hard disk or drive.

[0121] Without loss of generality, the computer-readable medium may include computer storage media and communication media. Computer storage media include volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include random access memory (RAM), read-only memory (ROM), flash memory or other solid-state storage technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, cassette, magnetic tape, disk storage or other magnetic storage devices. Of course, those skilled in the art will know that the computer storage medium is not limited to the above. The above-mentioned system memory 904 and mass storage device 907 can be collectively referred to as memory.

[0122] The memory stores one or more programs, and the one or more programs are configured to be executed by one or more central processing units 901. The one or more programs contain instructions for implementing the above-mentioned methods. The central processing unit 901 executes the one or more programs to implement the control methods provided by the above-mentioned various method embodiments.

[0123] According to various embodiments of the present application, the computer device 900 can also be connected to a remote computer on the network through a network such as the Internet. That is, the computer device 900 can be connected to the network 911 through the network interface unit 912 connected to the system bus 905, or the network interface unit 912 can be used to connect to other types of networks or remote computer systems (not shown).

[0124] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0125] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A thermal management test system for a power battery, characterized in that: The system includes a charging and discharging device, a refrigeration device, a battery pack placed in a temperature box, a circulation pipeline and a controller, and the refrigeration device includes a heat exchanger; Wherein, the battery pack is electrically connected to the charging and discharging device, and the circulation pipeline flows through the battery pack and the heat exchanger in the refrigeration device; The charging and discharging equipment is used to charge and discharge the battery pack during a thermal management test, wherein the thermal management test includes a cooling test, a heating test, and a temperature equalization test; The controller is used to control the circulation pipeline to perform heat exchange with the refrigeration equipment during the cooling test; The controller is also used to control the circulation pipeline not to perform heat exchange with the refrigeration equipment during the heating test and the temperature equalization test.

2. The system according to claim 1, characterized in that The circulation pipeline includes a water inlet pipeline, a water outlet pipeline and a connecting pipeline, and the connecting pipeline is used to connect the water inlet pipeline with the water outlet pipeline; the circulation pipeline is provided with a first heater, a water pump and a solenoid valve group; The solenoid valve group includes a first solenoid valve and a second solenoid valve, the first solenoid valve is located in the water inlet pipeline and close to the refrigeration equipment, and the second solenoid valve is located in the connecting pipeline; The first heater is located on the water inlet pipeline and close to the battery pack, and the water pump is located on the water outlet pipeline and close to the battery pack.

3. The system according to claim 2, characterized in that The refrigeration equipment includes a condenser, an expansion valve and a compressor; during the cooling test, The refrigeration equipment is used to cool the refrigerant medium through the compressor, the condenser and the expansion valve, so that the cooled refrigerant medium flows through the heat exchanger; The controller is used to set the first solenoid valve to an open state and the second solenoid valve to a closed state, so that the circulating medium in the circulating pipeline exchanges heat with the refrigerant medium in the heat exchanger; The circulation pipeline is used to cool the battery pack based on the circulating medium.

4. The system according to claim 3, characterized in that The heat exchanger is provided with a second heater; before the cooling test, The temperature box is used to adjust the test environment temperature of the battery pack and the circulation pipeline to a first target temperature; The second heater is used to adjust the test environment temperature of the heat exchanger to the first target temperature.

5. The system according to claim 2, characterized in that During the heating test, The controller is used to set the first solenoid valve to a closed state and the second solenoid valve to an open state to disconnect the heat exchange between the circulation pipeline and the refrigeration device; The first heater is used to heat the circulating medium in the circulating pipeline; The circulation pipeline is used to heat the battery pack based on the circulating medium; The water pump is used to adjust the flow rate of the circulating medium in the circulating pipeline.

6. The system according to claim 5, characterized in that Before the heating test, The temperature box is used to adjust the test environment temperature of the battery pack and the circulation pipeline to a second target temperature.

7. The system according to claim 2, characterized in that During the temperature test, The controller is used to set the first solenoid valve to a closed state and the second solenoid valve to an open state to disconnect the heat exchange between the circulation pipeline and the refrigeration device; The circulation pipeline is used to perform temperature uniformity treatment on the battery pack based on the circulating medium; The water pump is used to adjust the flow rate of the circulating medium in the circulating pipeline.

8. The system according to any one of claims 2 to 7, characterized in that: The system also includes a temperature sensor; The temperature sensor is used to collect the real-time temperature of the battery pack; The water pump is used to adjust the flow rate of the circulating medium in the circulation pipeline based on the real-time temperature; The first heater is used to control the heating rate of the circulating medium in the circulation pipeline based on the real-time temperature during the heating test.

9. A control method, characterized in that: The method is used in a thermal management test system for a power battery, the system comprising a charging and discharging device, a refrigeration device, a battery pack placed in a temperature box, a circulation pipeline and a controller, the refrigeration device comprising a heat exchanger; Wherein, the battery pack is electrically connected to the charging and discharging device, and the circulation pipeline flows through the battery pack and the heat exchanger in the refrigeration device; The method comprises: During the thermal management test, the battery pack is charged and discharged by the charging and discharging equipment, and the thermal management test includes a cooling test, a heating test, and a temperature equalization test; During the cooling test, the controller controls the circulation pipeline to perform heat exchange with the refrigeration equipment; During the heating test and the temperature equalization test, the controller controls the circulation pipeline not to perform heat exchange with the refrigeration equipment.

10. A computer device, characterized in that: The computer device includes a processor and a memory; the memory stores at least one computer instruction, and the at least one computer instruction is used to be executed by the processor to implement the control method as claimed in claim 9.

Images