Sealing performance test cabinet for battery pack

Abstract

The invention discloses a sealing performance test cabinet for a battery pack. The battery pack comprises a battery pack body and a water cooling plate. The sealing performance test cabinet comprises a housing; the first test unit is arranged in the shell, and the first test unit is configured to be used for testing the air tightness of the battery pack body; and a second test unit arranged in the housing, wherein the second test unit is configured to test the air tightness of the water cooling plate. According to the sealing performance test cabinet, airtightness detection of the battery pack body and airtightness detection of the water cooling plate can be synchronously carried out, the test operation is simple, and the automation degree is high.

Description

Leakage test cabinet for battery packs Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a sealing test cabinet for a battery pack. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] Currently, the sealing test equipment used in electric vehicle battery packs lacks comprehensive functionality and a high level of integration. Furthermore, the airtightness testing of the battery pack and the cooling plate cannot be performed simultaneously. Consequently, the testing process is complex and lacks a high degree of automation.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides a sealing test cabinet for a battery pack, which can simultaneously perform airtightness testing of the battery pack body and the airtightness testing of the water cooling plate. The test operation is simple and the degree of automation is high.

[0006] On the one hand, the present application provides a sealing test cabinet for a battery pack, wherein the battery pack includes a battery pack body and a water-cooling plate, and the sealing test cabinet includes: a shell; a first test unit arranged in the shell, the first test unit being configured to test the airtightness of the battery pack body; and a second test unit arranged in the shell, the second test unit being configured to test the airtightness of the water-cooling plate.

[0007] In the technical solution of the embodiment of the present application, the first test unit configured to test the airtightness of the battery pack and the second test unit configured to test the airtightness of the water-cooled plate are both arranged in the shell of the sealing test cabinet. With this arrangement, the sealing test cabinet only needs to be connected to the air source and power supply to be used, and can simultaneously perform the airtightness test of the battery pack and the airtightness test of the water-cooled plate. Therefore, a highly integrated sealing test cabinet is realized, which is simple to operate and has a high degree of automation.

[0008] In some embodiments, the sealing test cabinet further includes: a pressure-surge tank, which is operably connected to the first test unit and the second test unit and is configured to inflate the battery package and the water-cooled plate; and a vacuum generator, which is operably connected to the first test unit and the second test unit and is configured to extract air from the battery package and the water-cooled plate. By inflating with the pressure-surge tank, the battery package and the water-cooled plate can be tested for air tightness under positive pressure conditions. By extracting air with the vacuum generator, the battery package and the water-cooled plate can be tested for air tightness under negative pressure conditions. Therefore, it is possible to seamlessly switch between positive pressure testing and negative pressure testing according to different needs.

[0009] In some embodiments, the first test unit includes: a first standard end, the first standard end configured to provide a first standard end pressure in a first test phase; a first test end, the first test end connected to the battery pack via a first test monitoring interface and configured to provide a first test end pressure in the first test phase; a first differential pressure sensor, the first differential pressure sensor configured to detect a differential pressure value between the first standard end pressure and the first test end pressure in the first test phase; and a first leak detector, the first leak detector configured to provide a test result of the airtightness of the battery pack based on the differential pressure value between the first standard end pressure and the first test end pressure. With such a configuration, the airtightness of the battery pack can be accurately tested by differential pressure testing.

[0010] In some embodiments, the first standard end pressure is provided by inflating the first standard end through the pressure stabilizing tank via the first control valve and the first standard end pressure stabilizing valve, and the first test end pressure is provided by inflating the first test end through the pressure stabilizing tank via the first control valve and the first test end pressure stabilizing valve, and both the first standard end pressure and the first test end pressure are positive pressures. By inflating the pressure stabilizing tank via the relevant control valves and pressure stabilizing valves, the first standard end pressure and the first test end pressure can be stably and accurately provided.

[0011] In some embodiments, the first test phase includes a first inflation period, a first pressure stabilization period, and a first test period, wherein: during the first inflation period, the first control valve, the first standard end pressure stabilization valve, and the first test end pressure stabilization valve are all opened, and the first standard end and the first test end are inflated through the pressure stabilization tank at a first inflation pressure controlled by the first inflation pressure reducing valve, so that at the end of the first inflation period, the first standard end pressure and the first test end pressure are substantially equal to a first set pressure; during the first pressure stabilization period following the first inflation period, the first control valve is closed, thereby stopping inflation and connecting the first standard end and the first test end to each other for pressure stabilization; and during the first test period following the first pressure stabilization period, the first standard end pressure stabilization valve and the first test end pressure stabilization valve are closed to stop pressure stabilization, and after a predetermined time, the first differential pressure sensor detects the differential pressure between the first standard end pressure and the first test end pressure, and the first leak detector provides a test result of the battery pack's airtightness based on the differential pressure between the first standard end pressure and the first test end pressure. This configuration can further improve the accuracy of battery pack airtightness testing using differential pressure detection.

[0012] In some embodiments, the first test phase further includes a first pre-inflation period prior to the first inflation period, wherein during the first pre-inflation period, the first standard end and the first test end are inflated via the surge tank at a first pre-inflation pressure controlled by the first inflation pressure reducing valve, wherein the first pre-inflation pressure is greater than the first inflation pressure. By first pre-inflation at a higher pre-inflation pressure for a certain period of time and then switching to normal inflation pressure for inflation, inflation can be completed more quickly and test results can be more accurate.

[0013] In some embodiments, the first standard end pressure is provided by the vacuum generator by pumping air from the first standard end via the first control valve and the first standard end pressure-stabilizing valve, and the first test end pressure is provided by the vacuum generator by pumping air from the first test end via the first control valve and the first test end pressure-stabilizing valve, and both the first standard end pressure and the first test end pressure are negative pressures. By pumping air through the relevant control valves and pressure-stabilizing valves by the vacuum generator, the first standard end pressure and the first test end pressure can be ensured to be provided stably and accurately.

[0014] In some embodiments, the first test phase includes a first pumping period, a first pressure stabilization period, and a first test period, wherein: during the first pumping period, the first control valve, the first standard-end pressure stabilization valve, and the first test-end pressure stabilization valve are all opened, and air is pumped from the first standard end and the first test end via the vacuum generator at a first pumping pressure controlled by the first pumping pressure reducing valve, such that at the end of the first pumping period, the pressures at the first standard end and the first test end are substantially equal to a first set pressure; during a first pressure stabilization period following the first pumping period, the first control valve is closed, thereby stopping pumping and connecting the first standard end and the first test end to each other for pressure stabilization; and during the first test period following the first pressure stabilization period, the first standard-end pressure stabilization valve and the first test-end pressure stabilization valve are closed to stop pressure stabilization, and after a predetermined time, the first differential pressure sensor detects the differential pressure between the first standard-end pressure and the first test-end pressure, and the first leak detector provides a test result of the battery pack's airtightness based on the differential pressure between the first standard-end pressure and the first test-end pressure. This configuration further improves the accuracy of differential pressure detection of the battery pack's airtightness.

[0015] In some embodiments, the first test phase further includes a first pre-pump period prior to the first pumping period, wherein during the first pre-pump period, the vacuum generator pumps air from the first standard end and the first test end at a first pre-pump pressure controlled by the first pumping pressure reducing valve, the first pre-pump pressure being greater than the first pumping pressure. By first using a higher pre-pump pressure for a certain period of time before switching to a normal pumping pressure for pumping, pumping can be completed more quickly and the test results can be more accurate.

[0016] In some embodiments, the first test unit further comprises a first calibration unit configured to perform automatic calibration of the first test unit. Automatic calibration enables automated spot checks, and uploading test results to a manufacturing execution system confirms that the entire test system is normal, allowing for seamless switching between automatic calibration and product testing.

[0017] In some embodiments, the first test unit further includes: a first inlet pressure sensor configured to detect the pressure of gas being charged into the battery pack or the pressure of gas being extracted from the battery pack; and a first outlet pressure sensor configured to detect the gas pressure at the outlet of the battery pack. Fault diagnosis of the first test unit can be performed based on the detection results of the first inlet pressure sensor and the first outlet pressure sensor. Such fault diagnosis allows for rapid discovery and timely resolution of various faults in the first test unit.

[0018] In some embodiments, the second test unit includes: a second standard end configured to provide a second standard end pressure during a second test phase; a second test end connected to the water-cooled plate via a second test monitoring interface and configured to provide a second test end pressure during the second test phase; a second differential pressure sensor configured to detect a differential pressure between the second standard end pressure and the second test end pressure during the second test phase; and a second leak detector configured to provide a test result of the air tightness of the water-cooled plate based on the differential pressure between the second standard end pressure and the second test end pressure. With this configuration, the air tightness of the water-cooled plate can be accurately tested using differential pressure testing.

[0019] In some embodiments, the second standard end pressure is provided by the pressure-suppressing tank inflating the second standard end via the second control valve and the second standard end pressure-suppressing valve, and the second test end pressure is provided by the pressure-suppressing tank inflating the second test end via the second control valve and the second test end pressure-suppressing valve, and both the second standard end pressure and the second test end pressure are positive pressures. By inflating the pressure-suppressing tank via the relevant control valves and pressure-suppressing valves, the second standard end pressure and the second test end pressure can be stably and accurately provided.

[0020] In some embodiments, the second test phase includes a second inflation period, a second pressure stabilization period, and a second test period, wherein: during the second inflation period, the second control valve, the second standard end pressure stabilization valve, and the second test end pressure stabilization valve are all opened, and the second standard end and the second test end are inflated by the pressure stabilization tank at a second inflation pressure controlled by the second inflation pressure reducing valve, so that at the end of the second inflation period, the second standard end pressure and the second test end pressure are substantially equal to the second set pressure; during a second pressure stabilization period after the second inflation period, the second control valve is closed, thereby stopping inflation and connecting the second standard end and the second test end to each other for pressure stabilization; and during a second test period after the second pressure stabilization period, the second standard end pressure stabilization valve and the second test end pressure stabilization valve are closed to stop pressure stabilization, and after a predetermined time, the second differential pressure sensor detects the differential pressure between the second standard end pressure and the second test end pressure, and the second leak detector provides a test result of the air tightness of the water cooling plate based on the differential pressure between the second standard end pressure and the second test end pressure. With such an arrangement, the accuracy of the air tightness detection of the water cooling plate by differential pressure detection can be further improved.

[0021] In some embodiments, the second test phase further includes a second pre-inflation period prior to the second inflation period, wherein during the second pre-inflation period, the second standard end and the second test end are inflated via the surge tank at a second pre-inflation pressure controlled by the second inflation pressure reducing valve, wherein the second pre-inflation pressure is greater than the second inflation pressure. By first pre-inflation at a higher pre-inflation pressure for a certain period of time and then switching to the normal inflation pressure for inflation, inflation can be completed more quickly and test results can be more accurate.

[0022] In some embodiments, the second standard end pressure is provided by the vacuum generator by pumping air from the second standard end via the second control valve and the second standard end pressure-stabilizing valve, and the second test end pressure is provided by the vacuum generator by pumping air from the second test end via the second control valve and the second test end pressure-stabilizing valve, and both the second standard end pressure and the second test end pressure are negative pressures. By pumping air through the relevant control valves and pressure-stabilizing valves by the vacuum generator, the second standard end pressure and the second test end pressure can be stably and accurately provided.

[0023] In some embodiments, the second test phase includes a second pumping period, a second pressure stabilization period, and a second test period, wherein: during the second pumping period, the second control valve, the second standard end pressure stabilization valve, and the second test end pressure stabilization valve are all opened, and the vacuum generator is used to pump air from the second standard end and the second test end at a second pumping pressure controlled by the second pumping pressure reducing valve, so that at the end of the second pumping period, the second standard end pressure and the second test end pressure are approximately equal to the second set pressure; during a second pressure stabilization period after the second pumping period, the second control valve is closed, thereby stopping pumping and connecting the second standard end and the second test end to each other for pressure stabilization; and during a second test period after the second pressure stabilization period, the second standard end pressure stabilization valve and the second test end pressure stabilization valve are closed to stop pressure stabilization, and after a predetermined time, the second differential pressure sensor detects the differential pressure between the second standard end pressure and the second test end pressure, and the second leak detector provides a test result of the air tightness of the water cooling plate based on the differential pressure between the second standard end pressure and the second test end pressure. With such an arrangement, the accuracy of the air tightness detection of the water cooling plate by differential pressure detection can be further improved.

[0024] In some embodiments, the second test phase further includes a second pre-pump period prior to the second pumping period, wherein during the second pre-pump period, the vacuum generator pumps air from the second standard end and the second test end at a second pre-pump pressure controlled by the second pumping pressure reducing valve, the second pre-pump pressure being greater than the second pumping pressure. By first performing pre-pumping at a higher pre-pump pressure for a certain period of time and then switching to a normal pumping pressure for pumping, pumping can be completed more quickly and the test results can be more accurate.

[0025] In some embodiments, the second test unit further comprises a second calibration unit configured to perform automatic calibration of the second test unit. Automatic calibration enables automated spot checks, and uploading test results to a manufacturing execution system confirms that the entire test system is free of anomalies, allowing for seamless switching between automatic calibration and product testing.

[0026] In some embodiments, the second test unit further includes: a second inlet pressure sensor configured to detect the pressure of gas being charged into the water-cooled plate or the pressure of gas being extracted from the water-cooled plate; and a second outlet pressure sensor configured to detect the gas pressure at the outlet of the water-cooled plate. Fault diagnosis of the second test unit can be performed based on the detection results of the second inlet pressure sensor and the second outlet pressure sensor. Such fault diagnosis allows for rapid discovery and timely resolution of various faults in the second test unit.

[0027] In some embodiments, the sealing test cabinet includes an exhaust valve configured to exhaust gas from the battery pack and / or the water-cooling plate after testing. By promptly exhausting the gas from the battery pack and the water-cooling plate after testing, problems such as bulging of the battery pack or difficulty removing the tooling due to trapped gas can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. 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 the drawings without creative work.

[0029] FIG1 is a schematic diagram showing the connection relationship of various components of a sealing test cabinet for a battery pack disclosed in one embodiment of the present application;

[0030] FIG2 is a schematic structural diagram of a sealing test cabinet disclosed in an embodiment of the present application;

[0031] FIG3 is another structural schematic diagram of a sealing test cabinet disclosed in one embodiment of the present application;

[0032] FIG4 is a partial enlarged view of FIG3;

[0033] FIG5 is an operation flow chart of a sealing test cabinet disclosed in an embodiment of the present application;

[0034] FIG6 is another operation flow chart of the sealing test cabinet disclosed in one embodiment of the present application.

[0035] In the drawings, the drawings are not drawn to scale.

[0036] The reference numerals in the specific embodiment are as follows: 1-factory gas source, 2-triplet, 3-pressure regulating tank, 4-first charging pressure reducing valve, 5-first exhaust pressure reducing valve, 6-vacuum generator, 7-second charging pressure reducing valve, 8-second control valve, 9-temperature sensor, 10-first control valve, 11-vent valve, 12-first inlet pressure sensor, 13-internal exhaust valve, 14-first test end pressure regulating valve, 15-first standard end pressure regulating valve, 16-first differential pressure sensor, 17-first test end stop valve, 18-first standard end stop valve, 1 9-External exhaust valve, 20-Calibration air control valve, 21-Standard leak hole, 22-Calibration leak air control valve, 23-Calibration standard tank, 24-Second outlet pressure sensor, 25-First outlet pressure sensor, 26-Battery package, 27-Water cooling plate, 28-Test air control valve, 29-First leak detector, 30-Second leak detector, 31-Indicator panel, 32-Control valve group, 33-Test standard tank, 34-Test monitoring interface, 35-Electric control cabinet, 100-Sealing test cabinet, 101-Shell. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, these terms may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on specific circumstances.

[0045] Currently, using a differential pressure leak detector to test the seals of battery packs and water-cooling plates requires an external standard port, resulting in a low level of integration for the seal-testing equipment. Furthermore, the airtightness testing of the battery pack and the water-cooling plate cannot be performed simultaneously. Consequently, the testing process is complex and lacks a high degree of automation.

[0046] In order to solve the above problems, the present application provides a sealing test cabinet for battery packs. By arranging a first test unit configured to test the airtightness of the battery pack body and a second test unit configured to test the airtightness of the water-cooling plate within the shell of the sealing test cabinet, the sealing test cabinet only needs to be connected to an air source and a power source for use, and can simultaneously perform airtightness testing of the battery pack body and airtightness testing of the water-cooling plate. Therefore, a highly integrated sealing test cabinet is realized, which is simple to operate and has a high degree of automation.

[0047] The battery pack disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. The airtightness test cabinet disclosed in the embodiments of this application can be used to test the airtightness of the battery pack body and water cooling plate included in the battery pack. Battery packs that pass the airtightness test can be used to form the power supply system of the electrical device.

[0048] According to some embodiments of the present application, a sealing test cabinet for a battery pack is described with reference to Figures 1 to 4. Figure 1 is a schematic diagram of the connection relationship of the various components of the sealing test cabinet for a battery pack disclosed in an embodiment of the present application. Figure 2 is a schematic diagram of the structure of the sealing test cabinet disclosed in an embodiment of the present application. Figure 3 is another schematic diagram of the structure of the sealing test cabinet disclosed in an embodiment of the present application. Figure 4 is a partial enlarged view of Figure 3. The present application provides a sealing test cabinet 100 for a battery pack. As shown in the figure, the battery pack includes a battery pack body 26 and a water cooling plate 27. The sealing test cabinet 100 includes a housing 101, a first test unit arranged in the housing 101, and a second test unit arranged in the housing 101. The first test unit is configured to test the airtightness of the battery pack body 26, and the second test unit is configured to test the airtightness of the water cooling plate 27. The configuration details of the first test unit and the second test unit will be further described below.

[0049] In addition, as shown in Figures 2 and 3 , a control valve group 32 including various control valves is also arranged within the housing 101 of the leak testing cabinet 100, details of which will be described below. Optionally, an electrical control cabinet 35 is also provided within the leak testing cabinet 100, in which relevant electrical components and control elements may be located.

[0050] By placing both the first test unit configured to test the airtightness of the battery pack 26 and the second test unit configured to test the airtightness of the water-cooling plate 27 within the housing 101 of the airtightness test cabinet 100, the airtightness test cabinet 100 only needs to be connected to the factory air source 1 and a power source for use, and can simultaneously perform airtightness tests on the battery pack 26 and the water-cooling plate 27. Thus, a highly integrated airtightness test cabinet is achieved, which is simple to operate and has a high degree of automation.

[0051] According to some embodiments of the present application, the sealing test cabinet 100 may optionally include a surge tank 3. As shown in FIG1 , the factory air source 1 may be connected to the surge tank 3 via a triplex 2 to supply air to the surge tank 3. The surge tank 3 is operably coupled to the first and second test units of the sealing test cabinet 100 and is configured to inflate the battery package 26 and the water-cooled plate 27. Further, optionally, the sealing test cabinet 100 may also include a vacuum generator. As shown in FIG1 and FIG4 , the first air exhaust pressure reducing valve 5 is connected to the vacuum generator 6, which is operably coupled to the first test unit and configured to extract air from the battery package 26. However, those skilled in the art will appreciate that the vacuum generator can be operably coupled to both the first and second test units and configured to extract air from the battery package 26 and the water-cooled plate 27. By inflating the surge tank 3, the battery package 26 and the water-cooled plate 27 can be tested for air tightness under positive pressure conditions. By using a vacuum generator to evacuate air, the battery pack 26 and the water-cooling plate 27 can be tested for airtightness under negative pressure conditions. Therefore, according to different needs, it is possible to seamlessly switch between positive and negative pressure tests.

[0052] According to some embodiments of the present application, the first test unit optionally includes a first standard port, a first test port, a first differential pressure sensor 16, and a first leak detector 29. As shown in Figures 1 and 3, the first standard port can be connected to a test standard tank 33 via a first standard port shutoff valve 18, so that the first standard port is configured to provide a first standard port pressure during the first test phase. The test standard tank 33 can, for example, be a standard volume tank with a capacity of 400 ml. Referring to Figure 3, the test monitoring interface 34 can include a first test monitoring interface and a second test monitoring interface. The first test port is connected to the battery pack 26 via the first test port shutoff valve 17, the test gas control valve 28, and the first test monitoring interface, and is configured to provide a first test port pressure during the first test phase. The first differential pressure sensor 16 is configured to detect the differential pressure between the first standard port pressure and the first test port pressure during the first test phase. The first leak detector 29 is configured to provide a test result of the airtightness of the battery pack 26 based on the differential pressure between the first standard port pressure and the first test port pressure. The test result can be displayed on the indicator panel 31. With this arrangement, the airtightness of the battery pack 26 can be accurately detected by differential pressure detection.

[0053] According to some embodiments of the present application, optionally, the first standard end pressure is provided by inflating the first standard end through the pressure stabilizing tank 3 via the first control valve 10 and the first standard end pressure stabilizing valve 15, and the first test end pressure is provided by inflating the first test end through the pressure stabilizing tank 3 via the first control valve 10 and the first test end pressure stabilizing valve 14, and both the first standard end pressure and the first test end pressure are positive pressures. As shown in FIG1 , a vent valve 11 can also be provided between the first control valve 10 and the first test end pressure stabilizing valve 14 and the first standard end pressure stabilizing valve 15. By inflating the pressure stabilizing tank 3 via the relevant control valves and pressure stabilizing valves, it is possible to ensure that the first standard end pressure and the first test end pressure are provided stably and accurately.

[0054] According to some embodiments of the present application, optionally, the first test phase includes a first inflation period, a first pressure stabilization period, and a first test period. Specifically, during the first inflation period, the first control valve 10, the first standard end pressure stabilization valve 15, and the first test end pressure stabilization valve 14 are all opened, and the first standard end and the first test end are inflated through the pressure stabilization tank 3 at the first inflation pressure controlled by the first inflation pressure reducing valve 4, so that at the end of the first inflation period, the first standard end pressure and the first test end pressure are substantially equal to the first set pressure. During the first pressure stabilization period after the first inflation period, the first control valve 10 is closed, thereby stopping inflation, and the first standard end pressure stabilization valve 15 and the first test end pressure stabilization valve 14 remain open, so that the first standard end and the first test end are connected to each other for pressure stabilization. During the first test period following the first pressure stabilization period, the first standard-end pressure-stabilizing valve 15 and the first test-end pressure-stabilizing valve 14 are closed to cease pressure stabilization. After a predetermined period of time, the first differential pressure sensor 16 detects the differential pressure between the first standard-end pressure and the first test-end pressure. The first leak detector 29 then provides a test result of the airtightness of the battery pack 26 based on the differential pressure between the first standard-end pressure and the first test-end pressure. The test result can be displayed on the indicator panel 31. This configuration further improves the accuracy of battery pack airtightness testing using differential pressure detection.

[0055] According to some embodiments of the present application, the first test phase optionally further includes a first pre-inflation period prior to the first inflation period. During the first pre-inflation period, the first standard end and the first test end are inflated via the surge tank 3 at a first pre-inflation pressure controlled by the first inflation pressure reducing valve 4. The first pre-inflation pressure is typically set to be greater than the first inflation pressure. By first using a higher pre-inflation pressure for a certain period of time and then switching to the normal inflation pressure for inflation, inflation can be completed more quickly and the test results can be more accurate.

[0056] According to some embodiments of the present application, the first standard end pressure can optionally be provided by the vacuum generator 6 by pumping air from the first standard end via the first control valve 10 and the first standard end pressure-stabilizing valve 15. Therefore, the first standard end pressure is a negative pressure. Alternatively, the first test end pressure can be provided by the vacuum generator by pumping air from the first test end via the first control valve 10 and the first test end pressure-stabilizing valve 14. In this case, the first test end pressure can also be a negative pressure. By pumping air through the relevant control valves and pressure-stabilizing valves by the vacuum generator, it is possible to ensure that the first standard end pressure and the first test end pressure are provided stably and accurately.

[0057] According to some embodiments of the present application, optionally, the first test phase includes a first air extraction period, a first pressure stabilization period, and a first test period. During the first air extraction period, the first control valve 10, the first standard end pressure stabilization valve 15, and the first test end pressure stabilization valve 14 are all opened, and air is extracted from the first standard end and the first test end by the vacuum generator at the first air extraction pressure controlled by the first air extraction pressure reducing valve 5, so that at the end of the first air extraction period, the first standard end pressure and the first test end pressure are substantially equal to the first set pressure. During the first pressure stabilization period after the first air extraction period, the first control valve 10 is closed, thereby stopping air extraction, and the first standard end pressure stabilization valve 15 and the first test end pressure stabilization valve 14 remain open, so that the first standard end and the first test end are connected to each other for pressure stabilization. During the first test period following the first pressure stabilization period, the first standard-end pressure-stabilizing valve 15 and the first test-end pressure-stabilizing valve 14 are closed to cease pressure stabilization. After a predetermined period of time, the first differential pressure sensor 16 detects the differential pressure between the first standard-end pressure and the first test-end pressure. The first leak detector 29 then provides a test result of the airtightness of the battery pack 26 based on the differential pressure between the first standard-end pressure and the first test-end pressure. The test result can be displayed on the indicator panel 31. This configuration further improves the accuracy of battery pack airtightness testing using differential pressure detection.

[0058] According to some embodiments of the present application, optionally, the first test phase further includes a first pre-pumping period before the first pumping period. During the first pre-pumping period, air is pumped from the first standard end and the first test end by the vacuum generator 6 at a first pre-pumping pressure controlled by the first pumping pressure reducing valve 5. The first pre-pumping pressure is generally set to be greater than the first pumping pressure. By first using a larger pre-pumping pressure for a certain period of time and then switching to a normal pumping pressure for pumping, the pumping can be completed more quickly and the test results can be made more accurate.

[0059] According to some embodiments of the present application, optionally, the first test unit further includes a first calibration part. The first calibration part is configured to perform automatic calibration of the first test unit. As shown in Figure 1, the first calibration part includes components such as a calibration air-controlled valve 20, a standard leak hole 21, a calibration leak air-controlled valve 22, and a calibration standard tank 23. The calibration standard tank 23 can be a standard volume tank with a capacity of 10L. As shown in Figure 1, by closing the test air-controlled valve 28 and opening the calibration air-controlled valve 20, you can switch to the automatic calibration circuit to perform automatic calibration of the first test unit. When performing automatic calibration, first close the calibration leak air-controlled valve 22. In this case, the automatic calibration circuit is connected to the calibration standard tank 23, which corresponds to a good air-tightness situation, thereby calibrating the detection value of the first differential pressure sensor 16 to 0 (that is, the leakage volume is basically 0). The standard leak air control valve 22 is then opened. In this case, the automatic calibration circuit is connected to the standard leak 21, thereby calibrating the detection value of the first differential pressure sensor 16 to a value corresponding to the standard leak volume of the standard leak 21, and completing the automatic calibration of the first differential pressure sensor 16. Automatic calibration enables automated spot checks, and by uploading the test results to the manufacturing execution system, it can be confirmed that there are no abnormalities in the entire test system, allowing for seamless switching between automatic calibration and product testing.

[0060] According to some embodiments of the present application, the first test unit optionally further includes a first inlet pressure sensor 12 and a first outlet pressure sensor 25. The first inlet pressure sensor 12 is configured to detect the pressure of gas being charged into the battery pack 26 or the pressure of gas being extracted from the battery pack 26. The first outlet pressure sensor 25 is configured to detect the gas pressure at the outlet of the battery pack 26. Fault diagnosis of the first test unit can be performed based on the detection results of the first inlet pressure sensor 12 and the first outlet pressure sensor 25. Through such fault diagnosis, various faults in the first test unit can be quickly discovered and addressed in a timely manner.

[0061] Specifically, Figure 5 shows an operational flow chart of the leak-tightness test cabinet 100 described above. As shown in Figure 5, in step S1 (the first inflation period), the first standard end and the first test end are inflated via the surge tank 3 at a first inflation pressure controlled by the first inflation pressure reducing valve 4. The surge tank 3 may be equipped with a temperature sensor 9 for detecting temperature and capable of promptly issuing an alarm if the gas temperature exceeds a specified limit. In step S2, the inflation pressure of the battery pack 26 is detected by the first inlet pressure sensor 12, and the gas pressure at the outlet of the battery pack 26 is detected by the first outlet pressure sensor 25 to determine whether the pressure is normal. Based on the detection results of the first inlet pressure sensor 12 and / or the first outlet pressure sensor 25, various faults can be diagnosed (including but not limited to whether the gas pipe is bent or leaking, whether the seal is intact, and whether there is gas remaining inside the product). Fault analysis and repair can be carried out promptly if a fault occurs. Furthermore, the inflation pressure can be automatically adjusted based on the detected pressure values. In step S3 (the first pressure stabilization period), inflation is stopped, and the first standard end and the first test end are connected to each other for pressure stabilization. In step S4, pressure detection is performed again to determine whether the pressure is normal. In step S5 (the first test period), the differential pressure value is detected by the first differential pressure sensor 16. Finally, in step S6, the first leak detector 29 gives the test result. Specifically, when the differential pressure value is greater than the set differential pressure threshold, an alarm is triggered, the air tightness of the battery package is judged to be unqualified and analyzed for repair; otherwise, the air tightness of the battery package is judged to be qualified. The external exhaust valve 19 is opened to release the pressure inside the product. When the battery package 26 and the water-cooled plate 27 are tested at the same time, exhaust is performed only after both are tested.

[0062] In addition, Figure 6 shows an operational flow chart of the leak-tightness test cabinet 100 described above, including a pre-filling step. As shown in Figure 6, in step S10 (the first pre-filling period), the first standard port and the first test port are filled with gas via the surge tank 3 at a first pre-filling pressure controlled by the first inflation pressure reducing valve 4. The surge tank 3 may be equipped with a temperature sensor 9 for detecting temperature and capable of generating an alarm if the gas temperature exceeds a specified limit. In step S20, the first inlet pressure sensor 12 detects the pressure of the gas filling the battery pack 26, and the first outlet pressure sensor 25 detects the gas pressure at the outlet of the battery pack 26 to determine whether the pressure is normal. Based on the detection results of the first inlet pressure sensor 12 and / or the first outlet pressure sensor 25, various faults can be diagnosed and promptly analyzed and repaired when a fault occurs. Furthermore, the inflation pressure can be automatically adjusted based on the detected pressure values. Subsequent steps S30 to S80 in Figure 6 are essentially the same as steps S1 to S6 shown in Figure 5, and their repeated description is omitted here.

[0063] According to some embodiments of the present application, the structure and configuration of the second test unit are substantially the same as those of the first test unit. Optionally, the second test unit includes a second standard end, a second test end, a second differential pressure sensor, and a second leak detector. As shown in Figures 1 and 3, the second standard end can be connected to a test standard tank 33 via a second standard end shutoff valve, so that the second standard end is configured to provide a second standard end pressure during the second test phase. The test standard tank 33 can, for example, be a standard volume tank with a capacity of 400 ml. Referring to Figure 3, the test monitoring interface 34 can include a first test monitoring interface and a second test monitoring interface. The second test end is connected to the water cooling plate 27 via the second test monitoring interface and is configured to provide a second test end pressure during the second test phase. The second differential pressure sensor is configured to detect the differential pressure between the second standard end pressure and the second test end pressure during the second test phase. The second leak detector 30 is configured to provide a test result of the air tightness of the water cooling plate 27 based on the differential pressure between the second standard end pressure and the second test end pressure. This arrangement enables accurate testing of the air tightness of the water cooling plate using differential pressure testing.

[0064] According to some embodiments of the present application, optionally, the second standard end pressure is provided by inflating the second standard end via the second control valve 8 and the second standard end pressure-stabilizing valve through the pressure-stabilizing tank 3, and the second test end pressure is provided by inflating the second test end via the second control valve 8 and the second test end pressure-stabilizing valve through the pressure-stabilizing tank 3, and both the second standard end pressure and the second test end pressure are positive pressures. By inflating the pressure-stabilizing tank 3 via the relevant control valves and pressure-stabilizing valves, it is possible to ensure that the second standard end pressure and the second test end pressure are provided stably and accurately.

[0065] According to some embodiments of the present application, the second test phase optionally includes a second inflation period, a second pressure stabilization period, and a second test period. Specifically, during the second inflation period, the second control valve 8, the second standard-end pressure-stabilizing valve, and the second test-end pressure-stabilizing valve are all opened, and the second standard-end and the second test-end pressure-stabilizing valve are inflated via the pressure-stabilizing tank 3 at the second inflation pressure controlled by the second inflation pressure-reducing valve 7, such that at the end of the second inflation period, the second standard-end pressure and the second test-end pressure are approximately equal to the second set pressure. Following the second inflation period, during a second pressure stabilization period, the second control valve is closed, thereby terminating inflation. The second standard-end pressure-stabilizing valve and the second test-end pressure-stabilizing valve remain open, connecting the second standard-end and the second test-end for pressure stabilization. Following the second pressure stabilization period, during a second test period, the second standard-end pressure-stabilizing valve and the second test-end pressure-stabilizing valve are closed to terminate pressure stabilization. After a predetermined time, the second differential pressure sensor detects the differential pressure between the second standard-end pressure and the second test-end pressure. The second leak detector 30 provides a test result of the airtightness of the water-cooled plate 27 based on the differential pressure between the second standard-end pressure and the second test-end pressure. With such an arrangement, the detection accuracy of the airtightness of the water-cooling plate by differential pressure detection can be further improved.

[0066] According to some embodiments of the present application, the second test phase optionally further includes a second pre-inflation period prior to the second inflation period. During the second pre-inflation period, the second standard end and the second test end are inflated by the surge tank 3 at a second pre-inflation pressure controlled by the second inflation pressure reducing valve 7. The second pre-inflation pressure is typically set to be greater than the second inflation pressure. By first using a higher pre-inflation pressure for a certain period of time and then switching to the normal inflation pressure for inflation, inflation can be completed more quickly and the test results can be more accurate.

[0067] According to some embodiments of the present application, the second standard end pressure can optionally be provided by a vacuum generator by pumping air from the second standard end via a second control valve and a second standard end pressure-stabilizing valve. Therefore, the first standard end pressure is a negative pressure. Alternatively, the second test end pressure can be provided by a vacuum generator by pumping air from the second test end via the second control valve and the second test end pressure-stabilizing valve. In this case, the second test end pressure can also be a negative pressure. By pumping air through the relevant control valve and pressure-stabilizing valve by the vacuum generator, it is possible to ensure that the second standard end pressure and the second test end pressure are provided stably and accurately.

[0068] According to some embodiments of the present application, the second test phase optionally includes a second air extraction period, a second pressure stabilization period, and a second test period. During the second air extraction period, the second control valve, the second standard-end pressure stabilization valve, and the second test-end pressure stabilization valve are all opened, and air is extracted from the second standard end and the second test end via a vacuum generator at a second air extraction pressure controlled by the second air extraction pressure reducing valve, such that at the end of the second air extraction period, the second standard-end pressure and the second test-end pressure are approximately equal to the second set pressure. Following the second air extraction period, during a second pressure stabilization period, the second control valve is closed, thereby terminating air extraction. The second standard-end pressure stabilization valve and the second test-end pressure stabilization valve remain open, connecting the second standard end and the test end to each other for pressure stabilization. Following the second pressure stabilization period, during a second test period, the second standard-end pressure stabilization valve and the second test-end pressure stabilization valve are closed to terminate pressure stabilization. After a predetermined time, the second differential pressure sensor detects the differential pressure between the second standard-end pressure and the second test-end pressure. The second leak detector 30 provides a test result of the airtightness of the water-cooled plate 27 based on the differential pressure between the second standard-end pressure and the second test-end pressure. With such an arrangement, the detection accuracy of the airtightness of the water-cooling plate by differential pressure detection can be further improved.

[0069] According to some embodiments of the present application, the second test phase may further include a second pre-pumping period before the second pumping period. During the second pre-pumping period, air is pumped from the second standard end and the second test end by a vacuum generator at a second pre-pumping pressure controlled by a second pumping pressure reducing valve. The second pre-pumping pressure is typically set to be greater than the second pumping pressure. By first using a higher pre-pumping pressure for a certain period of time and then switching to a normal pumping pressure for pumping, pumping can be completed more quickly and the test results can be more accurate.

[0070] According to some embodiments of the present application, the second test unit optionally further includes a second calibration unit. The second calibration unit is configured to perform automatic calibration of the second test unit. The structure and configuration of the second calibration unit are substantially the same as those of the first calibration unit, and a repeated description thereof is omitted herein. Automatic spot inspection can be achieved by performing automatic calibration, and by uploading the test results to the manufacturing execution system, it can be confirmed that there are no abnormalities in the entire test system, so that seamless switching between automatic calibration and product testing can be achieved.

[0071] According to some embodiments of the present application, optionally, the second test unit further includes a second inlet pressure sensor and a second outlet pressure sensor 24. The second inlet pressure sensor is configured to detect the inflation pressure of the water-cooled plate 27 or the exhaust pressure of the water-cooled plate 27. The second outlet pressure sensor 24 is configured to detect the gas pressure at the outlet of the water-cooled plate 27. Fault diagnosis of the second test unit can be performed based on the detection results of the second inlet pressure sensor and the second outlet pressure sensor. Similar to the above, through such fault diagnosis, various faults in the second test unit can be quickly discovered and handled in a timely manner.

[0072] According to some embodiments of the present application, the sealing test cabinet 100 optionally includes an exhaust valve. The exhaust valve is configured to exhaust the gas inside the battery pack 26 and / or the water-cooling plate 27 after the test is completed. As shown in Figure 1, the exhaust valve may include an internal exhaust valve 13 and an external exhaust valve 19. By promptly exhausting the gas filled in the battery pack and the water-cooling plate after the test is completed, problems such as bulging of the battery pack or inability to remove the tooling due to retained gas can be prevented.

[0073] According to some embodiments of the present application, referring to Figures 1 to 4, the present application provides a sealing test cabinet 100 for a battery pack. As shown in the figure, the battery pack includes a battery pack body 26 and a water-cooling plate 27. The sealing test cabinet 100 includes a housing 101, a first test unit disposed within the housing 101, and a second test unit disposed within the housing 101. The first test unit is configured to test the airtightness of the battery pack body 26, and the second test unit is configured to test the airtightness of the water-cooling plate 27.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but should include all technical solutions that fall within the scope of the claims.

Claims

1. A sealing test cabinet for a battery pack, the battery pack comprising a battery pack body and a water cooling plate, characterized in that: The sealing test cabinet comprises: case; a first testing unit disposed in the housing, the first testing unit being configured to test the air tightness of the battery pack; and A second testing unit is arranged in the housing, and the second testing unit is configured to test the air tightness of the water cooling plate.

2. The sealing test cabinet according to claim 1, characterized in that: The sealing test cabinet also includes: a pressure-stabilizing tank, which is operably connected to the first test unit and the second test unit and is configured to inflate the battery package and the water-cooled plate; and a vacuum generator, which is operably connected to the first test unit and the second test unit and is configured to extract air from the battery package and the water-cooled plate.

3. The sealing test cabinet according to claim 2, characterized in that: The first testing unit comprises: a first standard end, the first standard end being configured to provide a first standard end pressure in a first test phase; A first test end, the first test end is connected to the battery pack body via a first test monitoring interface and is configured to provide a first test end pressure in the first test phase; a first differential pressure sensor, the first differential pressure sensor being configured to detect a differential pressure value between the first standard end pressure and the first test end pressure during the first test phase; and A first leak detector is configured to provide a test result of the airtightness of the battery package based on the differential pressure value between the first standard end pressure and the first test end pressure.

4. The sealing test cabinet according to claim 3, characterized in that: The first standard end pressure is provided by inflating the first standard end through the pressure-stabilizing tank via the first control valve and the first standard end pressure-stabilizing valve, and the first test end pressure is provided by inflating the first test end through the pressure-stabilizing tank via the first control valve and the first test end pressure-stabilizing valve, and both the first standard end pressure and the first test end pressure are positive pressures.

5. The sealing test cabinet according to claim 4, characterized in that: The first test phase includes a first inflation period, a first pressure stabilization period and a first test period, wherein: In a first inflation period, the first control valve, the first standard end pressure regulating valve and the first test end pressure regulating valve are all opened, and the first standard end and the first test end are inflated with a first inflation pressure controlled by the first inflation pressure reducing valve through the pressure regulating tank, so that at the end of the first inflation period, the pressure of the first standard end and the pressure of the first test end are substantially equal to the first set pressure; In a first pressure stabilization period after a first inflation period, the first control valve is closed, thereby stopping inflation and allowing the first standard end and the first test end to communicate with each other for pressure stabilization; and In the first test period after the first pressure stabilization period, the first standard end pressure stabilizing valve and the first test end pressure stabilizing valve are closed to stop pressure stabilization, and after a predetermined time, the first differential pressure sensor detects the differential pressure value between the first standard end pressure and the first test end pressure, and the first leak detector provides the airtightness detection result of the battery package based on the differential pressure value between the first standard end pressure and the first test end pressure.

6. The sealing test cabinet according to claim 5, characterized in that: The first test stage also includes a first pre-charge period before the first inflation period, wherein during the first pre-charge period, the first standard end and the first test end are inflated through the pressure-regulating tank with a first pre-charge pressure controlled by the first inflation pressure reducing valve, and the first pre-charge pressure is greater than the first inflation pressure.

7. The sealing test cabinet according to claim 3, characterized in that: The first standard end pressure is provided by the vacuum generator by drawing air from the first standard end via the first control valve and the first standard end pressure-stabilizing valve, and the first test end pressure is provided by the vacuum generator by drawing air from the first test end via the first control valve and the first test end pressure-stabilizing valve, and both the first standard end pressure and the first test end pressure are negative pressures.

8. The sealing test cabinet according to claim 7, characterized in that: The first test phase includes a first air extraction period, a first voltage stabilization period and a first test period, wherein: In a first air-pumping period, the first control valve, the first standard-end pressure-stabilizing valve, and the first test-end pressure-stabilizing valve are all opened, and air is pumped from the first standard end and the first test end by the vacuum generator at a first air-pumping pressure controlled by the first air-pumping pressure-reducing valve, so that at the end of the first air-pumping period, the pressures of the first standard end and the first test end are substantially equal to a first set pressure; In a first pressure stabilization period after the first air extraction period, the first control valve is closed, thereby stopping air extraction and connecting the first standard end and the first test end to each other for pressure stabilization; and In the first test period after the first pressure stabilization period, the first standard end pressure stabilizing valve and the first test end pressure stabilizing valve are closed to stop pressure stabilization, and after a predetermined time, the first differential pressure sensor detects the differential pressure value between the first standard end pressure and the first test end pressure, and the first leak detector provides the airtightness detection result of the battery package based on the differential pressure value between the first standard end pressure and the first test end pressure.

9. The sealing test cabinet according to claim 8, characterized in that: The first test stage also includes a first pre-pumping period before the first pumping period, wherein during the first pre-pumping period, air is pumped from the first standard end and the first test end by the vacuum generator at a first pre-pumping pressure controlled by the first pumping pressure reducing valve, and the first pre-pumping pressure is greater than the first pumping pressure.

10. The sealing test cabinet according to any one of claims 3 to 9, characterized in that: The first test unit further includes a first calibration section configured to perform automatic calibration of the first test unit.

11. The sealing test cabinet according to any one of claims 3 to 10, characterized in that: The first testing unit further includes: a first inlet pressure sensor configured to detect a charging pressure of the battery pack or a suction pressure of the battery pack; and a first outlet pressure sensor configured to detect the gas pressure at the outlet of the battery pack, Wherein, fault diagnosis of the first test unit can be achieved based on the detection results of the first inlet pressure sensor and the first outlet pressure sensor.

12. The sealing test cabinet according to any one of claims 3 to 11, characterized in that: The second test unit comprises: a second standard end, the second standard end being configured to provide a second standard end pressure during a second test phase; a second test end, the second test end being coupled to the water-cooled plate via a second test monitoring interface and being configured to provide a second test end pressure during the second test phase; a second differential pressure sensor configured to detect a differential pressure value between the second standard end pressure and the second test end pressure during the second test phase; and A second leak detector is configured to provide a test result of the air tightness of the water-cooled plate based on the differential pressure value between the second standard end pressure and the second test end pressure.

13. The sealing test cabinet according to claim 12, characterized in that: The second standard end pressure is provided by inflating the second standard end through the pressure-stabilizing tank via the second control valve and the second standard end pressure-stabilizing valve, and the second test end pressure is provided by inflating the second test end through the pressure-stabilizing tank via the second control valve and the second test end pressure-stabilizing valve, and both the second standard end pressure and the second test end pressure are positive pressures.

14. The sealing test cabinet according to claim 13, characterized in that: The second test phase includes a second inflation period, a second pressure stabilization period, and a second test period, wherein: During the second inflation period, the second control valve, the second standard end pressure regulating valve and the second test end pressure regulating valve are all opened, and the second standard end and the second test end are inflated with the second inflation pressure controlled by the second inflation pressure reducing valve through the pressure regulating tank, so that at the end of the second inflation period, the second standard end pressure and the second test end pressure are substantially equal to the second set pressure; In a second pressure stabilization period after the second inflation period, the second control valve is closed, thereby stopping inflation and connecting the second standard end and the second test end to each other for pressure stabilization; and In a second test period after the second pressure stabilization period, the second standard-end pressure stabilizing valve and the second test-end pressure stabilizing valve are closed to stop pressure stabilization, and after a predetermined time, the second differential pressure sensor detects the differential pressure value between the second standard-end pressure and the second test-end pressure, and the second leak detector provides a test result of the air tightness of the water cooling plate based on the differential pressure value between the second standard-end pressure and the second test-end pressure.

15. The sealing test cabinet according to claim 14, characterized in that: The second test stage also includes a second pre-charge period before the second charging period, wherein during the second pre-charge period, the second standard end and the second test end are charged with air through the pressure-regulating tank at a second pre-charge pressure controlled by the second charging pressure reducing valve, and the second pre-charge pressure is greater than the second charging pressure.

16. The sealing test cabinet according to claim 12, characterized in that: The second standard end pressure is provided by the vacuum generator by drawing air from the second standard end via the second control valve and the second standard end pressure-stabilizing valve, and the second test end pressure is provided by the vacuum generator by drawing air from the second test end via the second control valve and the second test end pressure-stabilizing valve, and both the second standard end pressure and the second test end pressure are negative pressures.

17. The sealing test cabinet according to claim 16, characterized in that: The second test phase includes a second air extraction period, a second voltage stabilization period, and a second test period, wherein: In the second air pumping period, the second control valve, the second standard end pressure regulating valve and the second test end pressure regulating valve are all opened, and air is pumped from the second standard end and the second test end by the vacuum generator at a second air pumping pressure controlled by the second air pumping pressure reducing valve, so that at the end of the second air pumping period, the second standard end pressure and the second test end pressure are substantially equal to the second set pressure; In a second pressure stabilization period after the second air extraction period, the second control valve is closed, thereby stopping air extraction and connecting the second standard end and the second test end to each other for pressure stabilization; and In a second test period after the second pressure stabilization period, the second standard-end pressure stabilizing valve and the second test-end pressure stabilizing valve are closed to stop pressure stabilization, and after a predetermined time, the second differential pressure sensor detects the differential pressure value between the second standard-end pressure and the second test-end pressure, and the second leak detector provides a test result of the air tightness of the water cooling plate based on the differential pressure value between the second standard-end pressure and the second test-end pressure.

18. The sealing test cabinet according to claim 17, characterized in that: The second test stage also includes a second pre-pumping period before the second pumping period, wherein during the second pre-pumping period, air is pumped from the second standard end and the second test end by the vacuum generator at a second pre-pumping pressure controlled by the second pumping pressure reducing valve, and the second pre-pumping pressure is greater than the second pumping pressure.

19. The sealing test cabinet according to any one of claims 12 to 18, characterized in that: The second test unit further includes a second calibration section configured to perform automatic calibration of the second test unit.

20. The sealing test cabinet according to any one of claims 12 to 19, characterized in that: The second test unit also includes: a second inlet pressure sensor configured to detect an inflation pressure of air into the water-cooled plate or an exhaust pressure of air from the water-cooled plate; and a second outlet pressure sensor, the second outlet pressure sensor being configured to detect the gas pressure at the outlet of the water cooling plate, Wherein, fault diagnosis of the second test unit can be realized based on the detection results of the second inlet pressure sensor and the second outlet pressure sensor.

21. The sealing test cabinet according to any one of claims 1 to 20, characterized in that: The sealing test cabinet includes an exhaust valve, and the exhaust valve is configured to exhaust the gas inside the battery pack and / or the water cooling plate after the test is completed.

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