Test system

Abstract

The invention relates to a test system. The test system comprises a cold plate, a refrigeration unit and a liquid cooling unit, the direct cooling unit comprises a direct cooling pipeline connected with an inlet and an outlet of the cold plate and direct cooling equipment arranged on the direct cooling pipeline. The liquid cooling unit comprises a liquid cooling pipeline connected with the inlet and the outlet of the cold plate respectively and liquid cooling equipment arranged on the liquid cooling pipeline; wherein a direct cooling mode of the test system can be formed after the direct cooling pipeline is communicated with the cold plate, and a liquid cooling mode of the test system can be formed after the liquid cooling pipeline is communicated with the cold plate; the direct cooling pipeline and the liquid cooling pipeline selectively communicate with the cold plate and are used for switching a direct cooling mode and a liquid cooling mode. The testing system disclosed by the invention can be switched to the liquid cooling mode when a low-temperature test is prepared to be performed on the battery pack so as to quickly reduce the environment temperature to the target temperature, and then the testing system is switched to the direct cooling mode so as to perform a direct cooling test on the battery pack; on the basis, the test system disclosed by the invention accelerates the test progress of the battery pack and improves the test efficiency.

Description

Technical Field

[0001] The present disclosure relates to the field of battery pack testing, and in particular, to a testing system. Background Art

[0002] In the related technology, the direct cooling and heating test bench can perform direct cooling and heating tests on the battery pack. During this process, the battery pack sometimes needs to be placed in an extreme ultra-low temperature environment before testing. However, the current test system has insufficient cooling capacity and cannot efficiently reduce the temperature to the preset temperature in a short time, affecting the test efficiency. Summary of the invention

[0003] The purpose of the present disclosure is to provide a test system that can switch to a direct cooling mode or a liquid cooling mode under different circumstances, so as to at least partially solve the above technical problems.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a test system for testing a battery pack, comprising: a cold plate; a direct cooling unit, comprising a direct cooling pipeline respectively connected to the inlet and outlet of the cold plate and a direct cooling device arranged on the direct cooling pipeline; and a liquid cooling unit, comprising a liquid cooling pipeline respectively connected to the inlet and outlet of the cold plate and a liquid cooling device arranged on the liquid cooling pipeline; wherein, after the direct cooling pipeline is connected with the cold plate, a direct cooling mode of the test system is formed, and after the liquid cooling pipeline is connected with the cold plate, a liquid cooling mode of the test system is formed; the direct cooling pipeline and the liquid cooling pipeline can be selectively connected with the cold plate to switch between the direct cooling mode and the liquid cooling mode.

[0005] Optionally, the testing system includes a first pipeline, a second pipeline and a third pipeline, the second pipeline and the third pipeline are respectively connected in parallel with part of the first pipeline; the first pipeline forms the direct cooling pipeline, and the second pipeline, the third pipeline and part of the first pipeline are connected to form the liquid cooling pipeline.

[0006] Optionally, the direct cooling equipment includes a compressor, a condenser and an expansion structure arranged in series in sequence; one end of the second pipeline is connected to the first pipeline close to the inlet side of the compressor, and the other end is connected to the first pipeline close to the outlet side of the condenser; both ends of the third pipeline are respectively connected to the first pipeline close to both ends of the expansion structure.

[0007] Optionally, the liquid cooling device includes a liquid pump and a liquid storage tank for storing refrigerant and arranged in series with the liquid pump, and the liquid pump is used to drive the refrigerant in the liquid storage tank to flow in the direct cooling pipeline and the liquid cooling pipeline; or, to drive the refrigerant in the direct cooling pipeline and the liquid cooling pipeline to flow back to the liquid storage tank.

[0008] Optionally, the testing system includes a shell for accommodating at least part of the direct cooling unit and at least part of the liquid cooling unit; the direct cooling unit is arranged in the shell, part of the liquid cooling unit is located in the shell, and the rest of the liquid cooling unit is located outside the shell; or, the liquid cooling unit is arranged in the shell, part of the direct cooling unit is located in the shell, and the rest of the direct cooling unit is located outside the shell; or, the direct cooling unit and the liquid cooling unit are both located in the shell.

[0009] Optionally, the test system also includes a subcooling unit, the liquid cooling pipeline also includes a fourth pipeline connected to part of the first pipeline, or connected to part of the second pipeline, or connected to part of the third pipeline, and the subcooling unit includes a first subcooling device connected to the outlet of the condenser and a second subcooling device arranged in the fourth pipeline.

[0010] Optionally, the first pipeline, the second pipeline and the third pipeline are located in the shell, and the fourth pipeline is connected to a portion of the first pipeline and is located outside the shell; a first stop valve is arranged between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; a second stop valve is arranged on the second pipeline; the liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; a fourth stop valve is arranged at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is arranged between the outlet of the cold plate and one end of the second pipeline.

[0011] Optionally, the first pipeline, the second pipeline and the third pipeline are located in the shell, and the fourth pipeline is connected to a portion of the first pipeline and is located outside the shell; a first stop valve is arranged between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; a second stop valve is arranged on the second pipeline; the liquid pump, the liquid storage tank and the second supercooling device are all arranged in the fourth pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the second supercooling device; a fourth stop valve is arranged at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is arranged between the outlet of the cold plate and one end of the second pipeline.

[0012] Optionally, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all located in the shell, and the fourth pipeline is connected to one of the first pipeline, the second pipeline and the third pipeline; a first stop valve is arranged between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; a second stop valve is arranged on the second pipeline; the liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; a fourth stop valve is arranged at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is arranged between the outlet of the cold plate and one end of the second pipeline.

[0013] Optionally, the test system also includes a supercooling unit, which includes a third supercooling device; the first pipeline, the second pipeline and the third pipeline are all located in the shell; the first inlet and the second inlet of the third supercooling device are respectively connected to the first pipeline and the second pipeline, and the outlet of the third supercooling device is connected to the first pipeline; a first stop valve is arranged between the inlet of the compressor and one end of the second pipeline and between the outlet of the condenser and the first inlet; a second stop valve is arranged on the second pipeline; the liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; a fourth stop valve is arranged at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is arranged between the outlet of the cold plate and one end of the second pipeline.

[0014] Optionally, the third supercooling device is configured so that the heat exchange area in the liquid cooling mode is larger than the heat exchange area in the direct cooling mode.

[0015] Optionally, the expansion structure is configured as an electronic expansion valve.

[0016] Through the above technical scheme, the test system of the present invention can switch to the liquid cooling mode when preparing to perform a low-temperature test on the battery pack, and quickly reduce the ambient temperature during the test to the target temperature through the liquid cooling unit and the cold plate. The test system then switches to the direct cooling mode to perform a direct cooling test on the battery pack through the direct cooling unit and the cold plate. Based on this, the test system of the present invention speeds up the test progress of the battery pack and improves the test efficiency.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a liquid cooling mode of a first embodiment of a test system provided by the present disclosure; Figure 2 is a schematic diagram of a direct cooling mode of a first embodiment of a test system provided by the present disclosure; Figure 3 is a schematic diagram of a liquid cooling mode of a second embodiment of a test system provided by the present disclosure; Figure 4 is a schematic diagram of a direct cooling mode of a second embodiment of a test system provided by the present disclosure; Figure 5 is a schematic diagram of a liquid cooling mode of a third embodiment of a test system provided by the present disclosure; Figure 6 is a schematic diagram of a direct cooling mode of a third embodiment of a test system provided by the present disclosure; Figure 7 is a schematic diagram of a liquid cooling mode of a fourth embodiment of a test system provided by the present disclosure; Figure 8 Schematic diagram of the direct cooling mode of the fourth embodiment of the test system provided by the present disclosure.

[0019] Description of Reference Numerals 1-cold plate; 2-direct cooling pipeline; 3-direct cooling equipment; 31-compressor; 32-condenser; 33-expansion structure; 3301-electronic expansion valve; 4-liquid cooling pipeline; 5-liquid cooling equipment; 51-liquid pump; 52-liquid storage tank; 6-first pipeline; 7-second pipeline; 8-third pipeline; 9-fourth pipeline; 10-subcooling unit; 1001-first subcooling device; 1002-second subcooling device; 1003-third subcooling device; 10031-first inlet; 10032-second inlet; 11-first stop valve; 12-second stop valve; 13-third stop valve; 14-fourth stop valve; 15-evaporation pressure regulating valve. DETAILED DESCRIPTION

[0020] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0021] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own contour. In addition, the terms "first", "second", "third", "fourth", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0022] The test system in the exemplary embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0023] In the related art, when a battery pack is tested on a direct cooling and direct heating test bench, the direct cooling capacity is relatively weak, so its cooling help in the preparation stage of the battery pack test is very limited, so that when using direct cooling to lower the temperature of the test environment, it will consume a lot of time, affecting the test efficiency of the battery pack.

[0024] Based on this, reference Figures 1 to 8 As shown, the present disclosure provides a test system, which can be used for testing a battery pack, and the test system includes a cold plate 1, a refrigeration unit and a liquid cooling unit; the direct cooling unit includes a direct cooling pipeline 2 respectively connected to the inlet and outlet of the cold plate 1 and a direct cooling device 3 arranged on the direct cooling pipeline 2; the liquid cooling unit includes a liquid cooling pipeline 4 respectively connected to the inlet and outlet of the cold plate 1 and a liquid cooling device 5 arranged on the liquid cooling pipeline 4; wherein, the direct cooling pipeline 2 can form a direct cooling mode of the test system after being connected with the cold plate 1, and the liquid cooling pipeline 4 can form a liquid cooling mode of the test system after being connected with the cold plate 1; the direct cooling pipeline 2 and the liquid cooling pipeline 4 can be selectively connected with the cold plate 1 to switch between the direct cooling mode and the liquid cooling mode.

[0025] Therefore, through the technical solution disclosed in the present invention, the test system can switch to the liquid cooling mode when preparing to test the battery pack. In the liquid cooling mode, after the liquid cooling device 5 is connected to the cold plate 1 through the liquid cooling pipeline 4, since the cooling effect of liquid cooling is stronger than the cooling effect of direct cooling, the test system can quickly reduce the ambient temperature required for the test to the target temperature in a short time. Then the test system switches to the direct cooling mode. In the direct cooling mode, after the direct cooling device 3 is connected to the cold plate 1 through the direct cooling pipeline 2, a conventional direct cooling test of the battery pack is performed.

[0026] Therefore, the test system disclosed in the present invention can quickly reduce the ambient temperature to the target temperature in the preparation stage of the low-temperature test of the battery pack, and then switch to the direct cooling mode to test the battery pack, thereby speeding up the test progress of the battery pack and improving the test efficiency.

[0027] In an embodiment of the present disclosure, the test system may include a first pipeline 6, a second pipeline 7 and a third pipeline 8, wherein the second pipeline 7 and the third pipeline 8 are respectively connected in parallel with a portion of the first pipeline 6; the first pipeline 6 forms a direct cooling pipeline 2, and the second pipeline 7, the third pipeline 8 and a portion of the first pipeline 6 are connected to form a liquid cooling pipeline 4. When the direct cooling mode is performed, the second pipeline 7 and the third pipeline 8 can be disconnected from the first pipeline 6 by opening and closing a plurality of stop valves in the test system, whereby the refrigerant can only be connected to the cold plate 1 through the first pipeline 6, that is, the first pipeline 6 forms a direct cooling pipeline 2, and the direct cooling device 3 is arranged on the first pipeline 6, thereby realizing a conventional direct cooling test of the battery pack.

[0028] In addition, when it is necessary to switch the test system to liquid cooling mode, the second pipeline 7 and the third pipeline 8 can be connected in parallel with part of the first pipeline 6 by opening and closing multiple stop valves, and the stop valves of the parallel part of the first pipeline 6 with the second pipeline 7 and the third pipeline 8 are in a closed state, so that the part of the first pipeline 6 equipped with the direct cooling device 3 cannot be connected with the cold plate 1. In this way, the refrigerant will pass through the second pipeline 7, the third pipeline 8 and part of the first pipeline 6 during the flow process, and the direct cooling device 3 is in the second pipeline 7 or the third pipeline 8, that is, the second pipeline 7, the third pipeline 8 and part of the first pipeline 6 form a liquid cooling pipeline 4, thereby ensuring that the test system can quickly reduce the ambient temperature to the target temperature by liquid cooling in the preparation stage of the low-temperature test of the battery pack.

[0029] It can be seen that under this connection mode, when switching between the direct cooling mode and the liquid cooling mode, there is no need to disassemble the pipelines and other components in the test system such as the direct cooling device 3, the liquid cooling device 5 and the cold plate 1, thereby improving the switching efficiency of the two modes.

[0030] In some embodiments, Figures 1 to 8As shown, the direct cooling equipment 3 includes a compressor 31, a condenser 32 and an expansion structure 33 which are arranged in series in sequence; one end of the second pipeline 7 is connected to the first pipeline 6 on the inlet side close to the compressor 31, and the other end is connected to the first pipeline 6 on the outlet side close to the condenser 32; both ends of the third pipeline 8 are respectively connected to the first pipeline 6 on the two ends of the expansion structure 33. In this way, the second pipeline 7 can be connected in parallel with the part of the first pipeline 6 provided with the compressor 31 and the condenser 32, and the third pipeline 8 can be connected in parallel with the part of the first pipeline 6 provided with the expansion structure 33. Based on this, when the test system is switched to the direct cooling mode, the second pipeline 7 and the third pipeline 8 are disconnected from the first pipeline 6, and the gaseous refrigerant enters the condenser 32 to condense into liquid refrigerant after being heated and pressurized by the compressor 31, and then passes through the expansion structure 33 to make the liquid refrigerant become a low-pressure liquid refrigerant, and finally enters the cold plate 1 to evaporate and absorb heat, thereby realizing the conventional direct cooling test of the battery pack; and when it is necessary to switch to the direct cooling mode, by opening and closing multiple stop valves, the compressor 31, the condenser 32 and the expansion structure 33 cannot be connected to the cold plate 1, and the second pipeline 7 and the third pipeline 8 are both connected to the first pipeline 6, that is, the liquid cooling device 5 in the liquid cooling pipeline 4 is used to reduce the ambient temperature of the battery pack during the test.

[0031] In the embodiments of the present disclosure, Figures 1 to 8 As shown, the liquid cooling device 5 may include a liquid pump 51 and a liquid storage tank 52 for storing refrigerant and arranged in series with the liquid pump 51. The liquid pump 51 is used to drive the refrigerant in the liquid storage tank 52 to flow in the direct cooling pipeline 2 and the liquid cooling pipeline 4; or, to drive the refrigerant in the direct cooling pipeline 2 and the liquid cooling pipeline 4 to flow back to the liquid storage tank 52. The liquid pump 51 can collect the refrigerant in the direct cooling pipeline 2 and the liquid cooling pipeline 4 into the liquid storage tank 52 or re-transport the refrigerant from the liquid storage tank 52 to the direct cooling pipeline 2 or the liquid cooling pipeline 4 when the direct cooling mode and the liquid cooling mode of the test system are switched to each other, that is, the test system of the present disclosure can share the refrigerant in the direct cooling mode and the liquid cooling mode, without changing the refrigerant when the modes are different, so as to avoid the different refrigerants remaining in the test system from affecting each other, thereby interfering with the operation of the test system.

[0032] Exemplarily, when switching from direct cooling mode to liquid cooling mode, the direct cooling device 3 stops running, and all stop valves in the test system are in an open state. At this time, the liquid pump 51 is running, the opening of the liquid storage tank 52 is in an open state, and the outlet is in a closed state, so the liquid pump 51 can collect the refrigerant in the direct cooling pipeline 2 and the liquid cooling pipeline 4 into the liquid storage tank 52, and then close the corresponding stop valve to prevent the direct cooling device 3 from being connected to the cold plate 1, so that only the liquid cooling device 5 can be connected to the cold plate 1 in the liquid cooling pipeline 4 formed by the second pipeline 7, the third pipeline 8 and part of the first pipeline 6. The liquid pump 51 continues to run, and the opening and outlet of the liquid storage tank 52 are open, so that the refrigerant in the liquid storage tank 52 can be transported to the liquid cooling pipeline 4 and enter the cold plate 1 for heat exchange. At this point, the test system switches to liquid cooling mode.

[0033] When switching from liquid cooling mode to direct cooling mode, the opening of the liquid storage tank 52 is opened and the outlet is closed. The liquid pump 51 can first recycle the refrigerant in the liquid cooling pipeline 4 into the liquid storage tank 52, and then open the stop valve that enables the direct cooling device 3 to connect with the cold plate 1. Then, the outlet of the liquid storage tank 52 is opened, and the liquid storage tank 52 is operated again. After the refrigerant in the liquid storage tank 52 enters the direct cooling pipeline 2, the connection between the liquid cooling device 5 and the cold plate 1 is disconnected through the stop valve. At this point, the refrigerant enters the cold plate 1 through the compressor 31, the condenser 32, the expansion structure 33 and other components in turn to evaporate and exchange heat. At this point, the test system is switched to direct cooling mode.

[0034] In addition, it should be noted that the refrigerant can be a refrigerant for automobile air conditioning.

[0035] In some embodiments, the test system may further include a shell (not shown in the figure) for accommodating at least part of the direct cooling unit and at least part of the liquid cooling unit; the direct cooling unit and the liquid cooling unit may be located entirely or partially in the shell according to site conditions and requirements. For example, the direct cooling unit may be entirely arranged in the shell, part of the liquid cooling unit may be located in the shell, and the remaining part of the liquid cooling unit may be located outside the shell, which may facilitate the disassembly and assembly of certain components in the liquid cooling unit to a certain extent and may reduce the space occupied by the shell as much as possible, thereby facilitating the movement of the shell; or, the liquid cooling unit may be arranged in the shell, part of the direct cooling unit may be located in the shell, and the remaining part of the direct cooling unit may be located outside the shell, which may facilitate the disassembly and assembly of certain components in the direct cooling unit to a certain extent and may reduce the space occupied by the shell as much as possible, thereby facilitating the movement of the shell; or, both the direct cooling unit and the liquid cooling unit may be located in the shell, which may improve the integration of the test system and ensure the stability of the test system.

[0036] In some embodiments of the present disclosure, Figures 1 to 6As shown, the test system may further include a subcooling unit 10, the liquid cooling pipeline 4 may further include a fourth pipeline 9 connected to a portion of the first pipeline 6, or to a portion of the second pipeline 7, or to a portion of the third pipeline 8, and the subcooling unit 10 may include a first subcooling device 1001 connected to the outlet of the condenser 32 and a second subcooling device 1002 disposed in the fourth pipeline 9. That is, the first subcooling device 1001 may be disposed in the direct cooling pipeline 2, which may further reduce the temperature of the refrigerant discharged from the condenser 32 when the test system is in the direct cooling mode, thereby improving the refrigeration efficiency; similarly, the second subcooling device 1002 may be located in the liquid cooling pipeline 4, thereby, it may further reduce the temperature of the refrigerant discharged from the liquid storage tank 52 when the test system is in the liquid cooling mode, thereby improving the refrigeration efficiency.

[0037] The first supercooling device 1001 and the second supercooling device 1002 may be configured as supercoolers.

[0038] The following will describe in detail various specific connection methods of the test system disclosed herein.

[0039] For example, in one embodiment of the test system, Figure 1 and Figure 2 As shown, the first pipeline 6, the second pipeline 7 and the third pipeline 8 of the test system are located in the shell, and the fourth pipeline 9 is connected to a part of the first pipeline 6 and is located outside the shell; a first stop valve 11 is arranged between one end of the second pipeline 7 and the inlet of the compressor 31 and between the other end of the second pipeline 7 and the outlet of the first supercooling device 1001; a second stop valve 12 is arranged on the second pipeline 7; a liquid pump 51 and a liquid storage tank 52 are arranged in the third pipeline 8, and a third stop valve 13 is arranged at the inlet of the liquid pump 51 and the outlet of the liquid storage tank 52; a fourth stop valve 14 is arranged at the inlet of the cold plate 1 and the outlet of the cold plate 1, and an evaporation pressure regulating valve 15 is arranged between the outlet of the cold plate 1 and one end of the second pipeline 7. That is, the direct cooling unit is entirely located in the shell, and the fourth pipeline 9 and the second supercooling device 1002 of the liquid cooling unit are located outside the shell. This can reduce the space occupied by the shell to a certain extent, facilitate the movement of the shell, and improve the disassembly and assembly efficiency of the fourth pipeline 9 and the second supercooling device 1002 in the liquid cooling unit. The second supercooling device 1002 located outside the shell can also be matched with the direct cooling units and some liquid cooling units in other test systems, thereby improving the use efficiency of the second supercooling device 1002 and reducing costs.

[0040] Specifically, when the test system is switched to the liquid cooling mode, the expansion structure 33, the evaporation pressure regulating valve 15 and all the stop valves in the test system can be in the open state, the inlet of the liquid storage tank 52 is opened, and the outlet is closed, so that the liquid pump 51 can collect all the refrigerant in the test system into the liquid storage tank 52, and then close the first stop valve 11 and the expansion structure 33, the second stop valve 12, the third stop valve 13, the fourth stop valve 14 and the evaporation pressure regulating valve 15 are still in the open state and the opening of the evaporation pressure regulating valve 15 is adjusted to the same diameter as the front and rear pipelines, the liquid pump 51 continues to run and the inlet and outlet of the liquid storage tank 52 are both in the open state, so that the liquid pump 51 can transport the liquid refrigerant in the liquid storage tank 52 to the liquid cooling pipeline 4 formed by the second pipeline 7, the third pipeline 8, the fourth pipeline 9 and part of the first pipeline 6, and the refrigerant enters the cold plate 1 for heat exchange after being further cooled by the second supercooling device 1002, thereby reducing the ambient temperature during the battery pack test.

[0041] After the ambient temperature drops to the target temperature, the test system can be switched from the liquid cooling mode to the direct cooling mode to facilitate the subsequent direct cooling test of the battery pack. Specifically, the outlet of the liquid storage tank 52 and the second supercooling device 1002 are closed, and the liquid pump 51 collects the refrigerant in the test system into the liquid storage tank 52, closes the second stop valve 12, opens the first stop valve 11, the expansion structure 33 and the outlet of the liquid storage tank 52, and the liquid pump 51 continues to run. After the refrigerant in the liquid storage tank 52 is transported to the direct cooling pipeline 2 , close the third stop valve 13 and the liquid pump 51, and adjust the opening of the evaporation pressure regulating valve 15 according to the demand. Therefore, when the direct cooling test of the battery pack is performed, the refrigerant in the direct cooling pipeline 2 that is in a gaseous state after heat exchange and evaporation is heated and pressurized by the compressor 31 and then enters the condenser 32 to condense into a liquid refrigerant. The first supercooling device 1001 cools it down and then uses the expansion structure 33 to make the liquid refrigerant become a low-pressure liquid refrigerant, and finally enters the cold plate 1 to evaporate and absorb heat. Therefore, a conventional direct cooling test of the battery pack can be achieved.

[0042] In addition, since the second supercooling device 1002 is in a closed state, when the test system is in the direct cooling mode, the refrigerant can pass through the second supercooling device 1002 located on the fourth pipeline 9 or the pipeline arranged in parallel with the fourth pipeline 9.

[0043] In another embodiment of the test system, Figure 3 and Figure 4As shown, the first pipeline 6, the second pipeline 7 and the third pipeline 8 are located in the shell, and the fourth pipeline 9 is connected to a part of the first pipeline 6 and is located outside the shell; a first stop valve 11 is arranged between one end of the second pipeline 7 and the inlet of the compressor 31 and between the other end of the second pipeline 7 and the outlet of the first supercooling device 1001; a second stop valve 12 is arranged on the second pipeline 7; the liquid pump 51, the liquid storage tank 52 and the second supercooling device 1002 are all arranged in the fourth pipeline 9, and a third stop valve 13 is arranged at the inlet of the liquid pump 51 and the outlet of the second supercooling device 1002; a fourth stop valve 14 is arranged at the inlet of the cold plate 1 and the outlet of the cold plate 1, and an evaporation pressure regulating valve 15 is arranged between the outlet of the cold plate 1 and one end of the second pipeline 7. That is, the third pipeline 8 of the direct cooling unit and the liquid cooling unit is located inside the shell, and the remaining pipelines and components of the liquid cooling unit are located outside the shell. This can further reduce the space occupied by the shell, facilitate the movement of the shell, and improve the disassembly and assembly efficiency of the liquid cooling device 5, the fourth pipeline 9 and the second supercooling device 1002 in the liquid cooling unit. The second supercooling device 1002 and the liquid cooling device 5 located outside the shell can also be matched with the direct cooling units and some liquid cooling units in other test systems, thereby improving the use efficiency of the liquid cooling device 5 and the second supercooling device 1002 and reducing costs.

[0044] In this embodiment, the switching process between the direct cooling mode and the liquid cooling mode of the test system and the operation process of the two modes are the same as those of the test system in the aforementioned embodiment, and the present disclosure will not repeat them here.

[0045] In another embodiment of the test system, Figure 5 and Figure 6 As shown, the first pipeline 6, the second pipeline 7, the third pipeline 8 and the fourth pipeline 9 are all located in the shell, and the fourth pipeline 9 is connected to one of the first pipeline 6, the second pipeline 7 and the third pipeline 8; a first stop valve 11 is arranged between one end of the second pipeline 7 and the inlet of the compressor 31 and between the other end of the second pipeline 7 and the outlet of the first supercooling device 1001; a second stop valve 12 is arranged on the second pipeline 7; a liquid pump 51 and a liquid storage tank 52 are arranged in the third pipeline 8, and a third stop valve 13 is arranged at the inlet of the liquid pump 51 and the outlet of the liquid storage tank 52; a fourth stop valve 14 is arranged at the inlet of the cold plate 1 and the outlet of the cold plate 1, and an evaporation pressure regulating valve 15 is arranged between the outlet of the cold plate 1 and one end of the second pipeline 7. That is, the direct cooling unit and the liquid cooling unit are both located in the shell, which can improve the integration of the test system, reduce the risk of leakage caused by frequent disassembly and assembly of the test system, and improve the overall stability of the test system.

[0046] In this embodiment, the switching process between the direct cooling mode and the liquid cooling mode of the test system and the operation process of the two modes are the same as those of the test system in the aforementioned embodiment, and the present disclosure will not repeat them here.

[0047] In another embodiment of the test system, Figure 7 and Figure 8 As shown, the test system may further include a subcooling unit 10 having a third subcooling device 1003, wherein the first pipeline 6, the second pipeline 7 and the third pipeline 8 are all located in the shell; the first inlet 10031 and the second inlet 10032 of the third subcooling device 1003 are respectively connected to the first pipeline 6 and the second pipeline 7, and the outlet of the third subcooling device 1003 is connected to the first pipeline 6; a first stop valve 11 is provided between the inlet of the compressor 31 and one end of the second pipeline 7 and between the outlet of the condenser 32 and the first inlet 10031; a second stop valve 12 is provided on the second pipeline 7; a liquid pump 51 and a liquid storage tank 52 are provided in the third pipeline 8, and a third stop valve 13 is provided at the inlet of the liquid pump 51 and the outlet of the liquid storage tank 52; a fourth stop valve 14 is provided at the inlet of the cold plate 1 and the outlet of the cold plate 1, and an evaporation pressure regulating valve 15 is provided between the outlet of the cold plate 1 and one end of the second pipeline 7. The direct cooling unit and the liquid cooling unit are both arranged in the shell, which can improve the integration and stability of the test system. In addition, the direct cooling unit and the liquid cooling unit of the test system share a supercooling device, namely the third supercooling device 1003, which can reduce the space occupied by the shell to a certain extent, facilitate the movement of the test system, and improve the response time of the boundary conditions of the test system in the direct cooling mode and the stability of the boundary condition control.

[0048] Specifically, when the test system is switched to the liquid cooling mode, the expansion structure 33, the evaporation pressure regulating valve 15 and all the stop valves in the test system can be in the open state, the inlet of the liquid storage tank 52 is opened, and the outlet is closed, so that the liquid pump 51 can collect all the refrigerant in the test system into the liquid storage tank 52, and then close the first stop valve 11 and the expansion structure 33, the second stop valve 12, the third stop valve 13, the fourth stop valve 14 and the evaporation pressure regulating valve 15 are still in the open state and the opening of the evaporation pressure regulating valve 15 is adjusted to and The diameters of the front and rear pipelines are the same, the liquid pump 51 continues to run and the inlet and outlet of the liquid storage tank 52 are both in an open state, so that the liquid pump 51 can transport the liquid refrigerant in the liquid storage tank 52 to the liquid cooling pipeline 4 formed by the second pipeline 7, the third pipeline 8, the fourth pipeline 9 and part of the first pipeline 6. The refrigerant enters the third supercooling device 1003 from the second inlet 10032 from the second pipeline 7, and enters the cold plate 1 for heat exchange after further cooling in the third supercooling device 1003, thereby reducing the ambient temperature during the battery pack test.

[0049] After the ambient temperature drops to the target temperature, the test system can be switched from the liquid cooling mode to the direct cooling mode to facilitate the subsequent direct cooling test of the battery pack. Specifically, the outlet of the liquid storage tank 52 and the second supercooling device 1002 are closed, and the liquid pump 51 collects the refrigerant in the test system into the liquid storage tank 52, closes the second stop valve 12, opens the first stop valve 11, the expansion structure 33 and the outlet of the liquid storage tank 52, and the liquid pump 51 continues to run. After the refrigerant in the liquid storage tank 52 is transported to the direct cooling pipeline 2, the third stop valve 13 and the liquid pump 51 are closed, and the evaporation pressure The force regulating valve 15 adjusts the opening degree according to the demand. Therefore, when the direct cooling test of the battery pack is performed, the refrigerant in the direct cooling pipeline 2 is in a gaseous state after heat exchange and evaporation. After being heated and pressurized by the compressor 31, it enters the condenser 32 to condense into a liquid refrigerant. The liquid refrigerant enters the third supercooling device 1003 from the first inlet 10031 through the first pipeline 6. After the third supercooling device 1003 cools it, it passes through the expansion structure 33 to make the liquid refrigerant become a low-pressure liquid refrigerant, and finally enters the cold plate 1 to evaporate and absorb heat. Therefore, the conventional direct cooling test of the battery pack can be realized.

[0050] It should be noted that if Figures 1 to 8 As shown, the third supercooling device 1003 is configured to have a heat exchange area in the liquid cooling mode that is larger than that in the direct cooling mode, so that the supercooling degree of the refrigerant is respectively adapted to the liquid cooling mode and the direct cooling mode, thereby improving the working efficiency of the test system in the direct cooling mode and the liquid cooling mode.

[0051] In the embodiments of the present disclosure, Figures 1 to 8 As shown, the expansion structure 33 can be configured as an electronic expansion valve 3301. The electronic expansion valve 3301 can quickly adjust the flow of the refrigerant entering the cold plate 1, thereby allowing the liquid low-pressure refrigerant entering the cold plate 1 to evaporate and absorb heat therein, thereby ensuring the direct cooling efficiency and further realizing the direct cooling test of the battery pack.

[0052] In addition, the expansion structure 33 may also be configured as a capillary tube or a thermal expansion valve or other throttling components.

[0053] In summary, the present disclosure exemplarily illustrates the working process of the test system.

[0054] The liquid cooling unit and direct cooling unit of the test system can be partially or completely arranged in the shell according to the working scene and on-site conditions, so as to facilitate the disassembly and assembly of components outside the shell or improve the integration of the test system; when the battery pack needs to be tested, the test system can be switched to the liquid cooling mode first. In the liquid cooling mode, all valve bodies in the test system can be in the open state, and the liquid pump 51 collects the refrigerant in the direct cooling pipeline 2 and the liquid cooling pipeline 4 into the liquid storage tank 52, and then disconnects the connection between the direct cooling device 3 and the cold plate 1. The liquid pump 51 transports the refrigerant in the liquid storage tank 52 to the liquid cooling pipeline 4, so that the refrigerant enters the cold plate 1 for heat exchange after passing through the corresponding second supercooling device 1002 or the third supercooling device 1003, thereby reducing the ambient temperature during the battery pack test.

[0055] After the ambient temperature drops to the target temperature, the test system can switch from the liquid cooling mode to the direct cooling mode to facilitate the direct cooling test of the battery pack. During this process, the liquid pump 51 first recovers the refrigerant in the test system into the liquid storage tank 52, then closes the second stop valve 12, opens the first stop valve 11, the expansion structure 33 and the outlet of the liquid storage tank 52, and the liquid pump 51 continues to operate until the refrigerant in the liquid storage tank 52 enters the direct cooling pipeline 2, and then closes the third stop valve 13 and the liquid pump 51, and the evaporation pressure regulating valve 15 adjusts the opening according to demand. Therefore, when performing the direct cooling test of the battery pack, the refrigerant in the direct cooling pipeline 2 that is in a gaseous state after heat exchange and evaporation enters the condenser 32 to be condensed into a liquid refrigerant after being heated and pressurized by the compressor 31. The first supercooling device 1001 or the third supercooling device 1003 cools it and then passes through the expansion structure 33 to make the liquid refrigerant become a low-pressure liquid refrigerant, and finally enters the cold plate 1 to evaporate and absorb heat, thereby realizing a conventional direct cooling test of the battery pack.

[0056] Based on this, the test system disclosed in the present invention can quickly reduce the ambient temperature to the target temperature through the liquid cooling mode during the preparation stage of the low-temperature test of the battery pack, and then the test system switches to the direct cooling mode to test the battery pack, thereby speeding up the test progress of the battery pack and improving the test efficiency.

[0057] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0059] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A test system for testing a battery pack, characterized in that: include: Cold plate; A direct cooling unit, comprising a direct cooling pipeline respectively connected to the inlet and outlet of the cold plate and a direct cooling device arranged on the direct cooling pipeline; and A liquid cooling unit, comprising a liquid cooling pipeline connected to the inlet and outlet of the cold plate respectively and a liquid cooling device arranged on the liquid cooling pipeline; Wherein, after the direct cooling pipeline is connected with the cold plate, a direct cooling mode of the test system is formed, and after the liquid cooling pipeline is connected with the cold plate, a liquid cooling mode of the test system is formed; The direct cooling pipeline and the liquid cooling pipeline can be selectively connected to the cold plate to switch between the direct cooling mode and the liquid cooling mode.

2. The test system according to claim 1, characterized in that: The test system comprises a first pipeline, a second pipeline and a third pipeline, wherein the second pipeline and the third pipeline are respectively connected in parallel with a part of the first pipeline; The first pipeline forms the direct cooling pipeline, and the second pipeline, the third pipeline and a part of the first pipeline are connected to form the liquid cooling pipeline.

3. The test system according to claim 2, characterized in that: The direct cooling device comprises a compressor, a condenser and an expansion structure which are sequentially arranged in series; One end of the second pipeline is connected to the first pipeline close to the inlet side of the compressor, and the other end is connected to the first pipeline close to the outlet side of the condenser; Two ends of the third pipeline are respectively connected to the first pipeline close to two ends of the expansion structure.

4. The test system according to claim 3, characterized in that: The liquid cooling device comprises a liquid pump and a liquid storage tank for storing refrigerant and arranged in series with the liquid pump, wherein the liquid pump is used to drive the refrigerant in the liquid storage tank to flow in the direct cooling pipeline and the liquid cooling pipeline; or, Used to drive the refrigerant in the direct cooling pipeline and the liquid cooling pipeline to flow back to the liquid storage tank.

5. The test system according to claim 4, characterized in that: The testing system includes a housing for accommodating at least a portion of the direct cooling unit and at least a portion of the liquid cooling unit; The direct cooling unit is arranged in the shell, part of the liquid cooling unit is located in the shell, and the rest of the liquid cooling unit is located outside the shell; or, The liquid cooling unit is arranged in the shell, part of the direct cooling unit is located in the shell, and the rest of the direct cooling unit is located outside the shell; or, The direct cooling unit and the liquid cooling unit are both located in the shell.

6. The test system according to claim 5, characterized in that: The test system also includes a subcooling unit, the liquid cooling pipeline also includes a fourth pipeline connected to part of the first pipeline, or connected to part of the second pipeline, or connected to part of the third pipeline, and the subcooling unit includes a first subcooling device connected to the outlet of the condenser and a second subcooling device arranged in the fourth pipeline.

7. The test system according to claim 6, characterized in that: The first pipeline, the second pipeline and the third pipeline are located inside the shell, and the fourth pipeline is connected to a portion of the first pipeline and is located outside the shell; A first stop valve is provided between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; A second stop valve is provided on the second pipeline; The liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; A fourth stop valve is provided at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is provided between the outlet of the cold plate and one end of the second pipeline.

8. The test system according to claim 6, characterized in that: The first pipeline, the second pipeline and the third pipeline are located inside the shell, and the fourth pipeline is connected to a portion of the first pipeline and is located outside the shell; A first stop valve is provided between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; A second stop valve is provided on the second pipeline; The liquid pump, the liquid storage tank and the second supercooling device are all arranged in the fourth pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the second supercooling device; A fourth stop valve is provided at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is provided between the outlet of the cold plate and one end of the second pipeline.

9. The test system according to claim 6, characterized in that: The first pipeline, the second pipeline, the third pipeline and the fourth pipeline are all located in the housing, and the fourth pipeline is connected to one of the first pipeline, the second pipeline and the third pipeline; A first stop valve is provided between one end of the second pipeline and the inlet of the compressor and between the other end of the second pipeline and the outlet of the first supercooling device; A second stop valve is provided on the second pipeline; The liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; A fourth stop valve is provided at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is provided between the outlet of the cold plate and one end of the second pipeline.

10. The test system according to claim 5, characterized in that: The test system further comprises a supercooling unit, wherein the supercooling unit comprises a third supercooling device; the first pipeline, the second pipeline and the third pipeline are all located in the shell; The first inlet and the second inlet of the third supercooling device are connected to the first pipeline and the second pipeline respectively, and the outlet of the third supercooling device is connected to the first pipeline; A first stop valve is provided between the inlet of the compressor and one end of the second pipeline and between the outlet of the condenser and the first inlet; A second stop valve is provided on the second pipeline; The liquid pump and the liquid storage tank are arranged in the third pipeline, and a third stop valve is arranged at the inlet of the liquid pump and the outlet of the liquid storage tank; A fourth stop valve is provided at the inlet of the cold plate and the outlet of the cold plate, and an evaporation pressure regulating valve is provided between the outlet of the cold plate and one end of the second pipeline.

11. The test system according to claim 10, characterized in that: The third supercooling device is configured so that the heat exchange area in the liquid cooling mode is larger than the heat exchange area in the direct cooling mode.

12. The test system according to any one of claims 3 to 11, characterized in that: The expansion structure is configured as an electronic expansion valve.

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