Air tightness detection method and system, controller and computer readable storage medium

Abstract

The embodiment of the invention provides an air tightness detection method and system, a controller and a computer readable storage medium. The air tightness detection method comprises the following steps: placing a heat management part in an accommodating space of a battery box body; the containing space is subjected to negative pressure pumping, and the pressure change in the containing space is detected; vacuumizing the thermal management component, and performing helium background detection on the thermal management component; filling helium into the accommodating space, and detecting a helium leakage rate value of the battery box body; and performing vacuum accumulated helium detection on the thermal management component. According to the technical scheme, the production efficiency of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of air tightness detection, and in particular to an air tightness detection method and system, a controller, and a computer-readable storage medium. Background Art

[0002] Currently, battery device manufacturing requires airtightness testing of the housing and thermal management components. To meet production schedules, these components are subjected to high-temperature treatment before testing. Because the positive pressure differential method is affected by temperature, the housing and thermal management components must be cooled before testing. This results in longer production schedules and impacts production efficiency. Summary of the Invention

[0003] The present application provides an airtightness detection method and system, a controller, and a computer-readable storage medium, which can improve the production efficiency of battery devices.

[0004] This application is achieved through the following technical solutions: In a first aspect, an embodiment of the present application provides an airtightness detection method, comprising: placing a thermal management component in a storage space of a battery case; applying negative pressure to the storage space and detecting pressure changes in the storage space; evacuating the thermal management component and performing a helium background test on the thermal management component; filling the storage space with helium and detecting the helium leakage rate of the battery case; and performing a vacuum accumulated helium test on the thermal management component.

[0005] According to the airtightness detection method of the embodiment of the present application, the thermal management component is placed in the storage space of the battery case, and the airtightness detection of the battery case and the airtightness detection of the thermal management component can be performed simultaneously to reduce the airtightness detection time and improve the production efficiency of the battery device; further, the storage space is filled with helium, and the battery case is subjected to helium detection. At the same time, the helium in the storage space is used to perform vacuum accumulation helium detection on the thermal management component, which can test the airtightness of high-temperature products with high detection precision and accuracy. In addition, while the battery case is being subjected to helium detection, the thermal management component can be vacuum accumulated to reduce the detection time and improve the production efficiency of the battery device. The battery case and the thermal management component can share the same helium mass spectrometer leak detector. After the helium detection of the battery case is completed, the thermal management component can be subjected to helium detection, thereby reducing detection costs and manufacturing costs.

[0006] According to some embodiments of the present application, filling the accommodation space with helium and detecting the helium leakage rate of the battery box includes: filling the accommodation space with helium multiple times and extracting the gas in the accommodation space between two adjacent helium filling actions.

[0007] In the above solution, by filling the containing space with helium multiple times and extracting the gas in the containing space between two adjacent helium filling actions, the uniform speed of helium in the containing space can be accelerated, the equilibrium time can be shortened, and the detection accuracy can be improved.

[0008] According to some embodiments of the present application, before performing vacuum accumulation helium inspection on the thermal management component, the process further includes: extracting gas from the thermal management component multiple times, and filling nitrogen into the thermal management component between two adjacent gas extraction actions.

[0009] In the above scheme, by extracting the gas in the thermal management component multiple times and filling the thermal management component with nitrogen between two adjacent gas extraction actions, the breathing action of the thermal management component is realized, which can amplify the defects of the thermal management component, increase the leakage of helium from the defective position of the thermal management component to the thermal management component, and improve the detection accuracy.

[0010] According to some embodiments of the present application, while filling the accommodation space with helium and detecting the helium leakage rate value of the battery box, the gas in the thermal management component is extracted multiple times simultaneously, and nitrogen is filled into the thermal management component between two adjacent gas extraction actions.

[0011] In the above scheme, since the helium detection time of the battery case is relatively long, while the helium detection of the battery case is being carried out, the thermal management component is repeatedly subjected to the action of extracting gas and filling helium. The waiting time for the helium detection of the battery case can be utilized to simultaneously perform the air tightness detection of the battery case and the thermal management component, thereby shortening the detection time of the battery device and improving the manufacturing efficiency of the battery device.

[0012] According to some embodiments of the present application, after completing the inspection of the helium leakage rate value of the battery box, a vacuum accumulation helium inspection is performed on the thermal management component.

[0013] In the above scheme, while performing helium testing on the battery box, the helium in the accommodation space is used to perform vacuum accumulation helium testing on the thermal management components located in the accommodation space, which can shorten the airtightness testing time and improve the testing efficiency.

[0014] According to some embodiments of the present application, after the thermal management component is subjected to vacuum accumulation helium inspection, the helium in the accommodation space is extracted and the accommodation space is restored to atmospheric pressure; nitrogen is filled into the interior of the thermal management component and the interior of the thermal management component is restored to atmospheric pressure.

[0015] In the above scheme, the helium in the accommodation space is extracted to achieve helium recycling and reduce the pollution of helium to the environment; nitrogen is filled into the interior of the thermal management component and the interior of the thermal management component is restored to atmospheric pressure. Nitrogen can reduce the oxidation and corrosion of impurities such as oxygen and moisture on the detection components.

[0016] According to some embodiments of the present application, pumping negative pressure into the accommodating space and detecting the pressure change in the accommodating space includes: pumping the pressure in the accommodating space to a first preset pressure value, stopping the pumping, standing for a first preset time, and detecting the pressure change in the accommodating space; if the pressure change value of the accommodating space is greater than the preset value, stopping the detection; if the pressure change value of the accommodating space is less than or equal to the preset value, filling the accommodating space with helium and detecting the helium leakage rate of the battery box.

[0017] In the above scheme, the pressure in the accommodating space is pumped to a first preset pressure value, the pumping is stopped, and the space is left to stand for a first preset time. The subsequent action is determined based on the pressure change detected in the accommodating space. If the pressure change value of the accommodating space is greater than the preset value, it indicates that there is a defect in the battery case, and the detection is stopped and the product is judged to be unqualified. If the pressure change value of the accommodating space is less than or equal to the preset value, it indicates that the battery case is qualified, and helium is filled into the accommodating space to perform a micro-leakage detection on the battery case.

[0018] According to some embodiments of the present application, evacuating the thermal management component and performing a helium background test on the thermal management component include: pumping the pressure inside the thermal management component to a second preset pressure value, stopping the vacuuming, standing for a second preset time, and performing a helium background test on the thermal management component. If the helium background leakage rate is greater than the preset value, the test is stopped; if the helium background leakage rate is less than or equal to the preset value, filling the accommodation space with helium, detecting the helium leakage rate value of the battery box, and performing a vacuum cumulative helium test on the thermal management component.

[0019] In the above scheme, the pressure in the thermal management component is pumped down to a second preset pressure value, the pumping is stopped, the component is left to stand for a second preset time, and the helium background leakage rate of the thermal management component is detected to improve the accuracy of the vacuum cumulative helium test of the thermal management component; based on the helium background leakage rate of the thermal management component, if the helium body leakage rate is less than or equal to the preset value, it indicates that the product is qualified, and the accommodating space is further filled with helium, the helium leakage rate of the battery box is detected, and the thermal management component is subjected to vacuum cumulative helium test; if the helium body leakage rate is greater than the preset value, the thermal management component is defective, the product is unqualified, and the test is stopped.

[0020] In a second aspect, the present application also provides a controller, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the airtightness detection method provided in the above embodiment is implemented.

[0021] In a third aspect, the present application also provides an airtightness detection system, which includes the controller provided in the above embodiment.

[0022] In a fourth aspect, the present application also provides a computer-readable storage medium storing computer-executable instructions, which are used to execute the airtightness detection method provided in the above embodiment.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic flow chart of an airtightness detection method provided in some embodiments of the present application; Figure 2 A simplified structural diagram of an airtightness detection device provided in some embodiments of the present application; Figure 3 Schematic diagram of the negative pressure and vacuum stages provided in some embodiments of the present application; Figure 4 Schematic diagram of the major leak detection and background detection stages provided in some embodiments of the present application; Figure 5 A schematic diagram of the helium filling stage provided for some embodiments of the present application; Figure 6 A schematic diagram of a respiratory replacement phase provided for some embodiments of the present application; Figure 7 A schematic diagram of the detection phase provided for some embodiments of the present application; Figure 8 A schematic diagram of the battery box detection process provided in some embodiments of the present application; Figure 9 A schematic diagram of the detection process of thermal management components provided in some embodiments of the present application.

[0026] Icons: 100-battery box; 110-accommodation space; 120-vent; 200-thermal management component; 210-inlet; 220-outlet; 11-first vacuum pump; 12-second vacuum pump; 21-first pipeline; 22-second pipeline; 23-third pipeline; 24-fourth pipeline; 25-fifth pipeline; 26-sixth pipeline; 27-seventh pipeline; 28-eighth pipeline; 29-ninth pipeline; 30-tenth pipeline; 31-eleventh pipeline; 32-twelfth pipeline; 41-first solenoid valve; 42-second solenoid valve; 4 3-third solenoid valve; 44-fourth solenoid valve; 45-fifth solenoid valve; 46-sixth solenoid valve; 47-seventh solenoid valve; 48-eighth solenoid valve; 49-ninth solenoid valve; 51-first pressure sensor; 52-second pressure sensor; 53-first differential pressure leak detector; 54-helium mass spectrometer leak detector; 55-helium detection sniffing gun; 56-third pressure sensor; 61-first pressure regulating valve; 62-second pressure regulating valve; 63-third pressure regulating valve; 71-storage tank; 81-helium gas source; 82-nitrogen gas source; 83-air gas source; 91-manipulator. DETAILED DESCRIPTION

[0027] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] The terms "first", "second" and the like in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0030] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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 in this application may be combined with other embodiments.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0032] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0033] The term "multiple" used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two (including two) groups, and "multiple sheets" refers to more than two (including two) sheets.

[0034] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0035] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0036] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0037] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0038] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0039] As an example, the housing may include a first sub-housing and a second sub-housing. The first and second sub-housings snap together to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first sub-housing may be a top cover or a bottom plate.

[0040] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0041] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0042] The battery device includes a thermal management component, which is used to contain a fluid to regulate the temperature of the battery cell assembly. The fluid here can be a liquid or a gas, and regulating the temperature means heating or cooling the battery cell assembly. In the case of cooling or lowering the temperature of the battery cell assembly, the thermal management component is used to contain a cooling fluid to lower the temperature of the battery cell assembly. In this case, the thermal management component can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid it contains can also be called a cooling medium or a cooling fluid, more specifically, a coolant or a cooling gas. In addition, the thermal management component can also be used for heating to increase the temperature of the battery cell assembly. Optionally, the fluid can be circulated to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0043] The thermal management component may be a water-cooling plate, which is assembled with the battery cell assembly to regulate the temperature of the battery cell assembly. The water-cooling plate has an inner cavity and an opening communicating with the inner cavity to allow fluid to enter or flow out of the inner cavity through the opening.

[0044] During the manufacturing process of battery devices, it is necessary to conduct air tightness tests on components with high air tightness requirements, such as air tightness tests on battery boxes and water-cooled plates. In the battery device manufacturing production line, in order to adapt to the production rhythm, after completing the high-temperature treatment of the previous process (such as the drying process), the box and the water-cooled plate are respectively tested for air tightness. When conducting air tightness testing, the positive pressure differential method is usually used. High-pressure air is filled into the test piece, and after stabilization, the pressure change of the test piece within a preset time is measured. However, since the positive pressure differential method is affected by temperature, the box and thermal management components need to be cooled before air tightness testing. The waiting time is long, which makes the production rhythm longer and affects production efficiency.

[0045] In view of this, in order to solve the problem of low production efficiency caused by high-temperature waiting, the present application provides an airtightness detection method, including: placing a thermal management component in the storage space of a battery box; pumping negative pressure into the storage space to detect the pressure change in the storage space; vacuuming the thermal management component and performing a helium background test on the thermal management component; filling the storage space with helium and detecting the helium leakage rate of the battery box; and performing a vacuum accumulated helium test on the thermal management component.

[0046] According to the airtightness detection method of the embodiment of the present application, the thermal management component is placed in the storage space of the battery case, and the airtightness detection of the battery case and the airtightness detection of the thermal management component can be performed simultaneously to reduce the airtightness detection time and improve the production efficiency of the battery device; further, the storage space is filled with helium, and the battery case is subjected to helium detection. At the same time, the helium in the storage space is used to perform vacuum accumulation helium detection on the thermal management component, which can test the airtightness of high-temperature products with high detection precision and accuracy. In addition, while the battery case is being subjected to helium detection, the thermal management component can be vacuum accumulated to reduce the detection time and improve the production efficiency of the battery device. The battery case and the thermal management component can share the same helium mass spectrometer leak detector. After the helium detection of the battery case is completed, the thermal management component can be subjected to helium detection, thereby reducing detection costs and manufacturing costs.

[0047] The airtightness detection method of the present application is described below with reference to the accompanying drawings.

[0048] Please refer to Figures 1 to 2 , Figure 1 A schematic flow chart of an airtightness detection method provided in some embodiments of the present application, Figure 2 A simplified structural diagram of an airtightness detection device provided in some embodiments of the present application. In a first aspect, an embodiment of the present application provides an airtightness detection method, comprising: S100, placing the thermal management component 200 in the accommodation space 110 of the battery box 100; S200 , applying negative pressure to the accommodation space 110 to detect pressure changes in the accommodation space 110 ; S300, evacuating the thermal management component 200 and performing a helium background test on the thermal management component 200; S400, filling the accommodating space 110 with helium and detecting the helium leakage rate of the battery box 100; S500 , performing a vacuum accumulation helium inspection on the thermal management component 200 .

[0049] In some embodiments, please refer to Figure 2 The present application also provides an airtightness detection device, which includes a first vacuum pump 11, a second vacuum pump 12, a helium gas source 81, a first pressure sensor 51, a second pressure sensor 52, a first differential pressure leak detector 53 and a helium mass spectrometer leak detector 54. The first vacuum pump 11 is used to extract the gas in the accommodating space 110; the second vacuum pump 12 is used to vacuum the thermal management component 200; the first differential pressure leak detector 53 is used to detect the pressure change in the accommodating space 110; the helium mass spectrometer leak detector 54 is used to perform helium background detection on the thermal management component 200, and to perform helium detection on the battery box 100; the first pressure sensor 51 is used to detect the pressure in the accommodating space 110, and the second pressure sensor 52 is used to detect the pressure inside the thermal management component 200.

[0050] For example, in step “S100, place the thermal management component 200 in the accommodating space 110 of the battery case 100”, after the thermal management component 200 is placed in the accommodating space 110 of the battery case 100, the battery case 100 is sealed, retaining the air vents 120 of the battery case 100 and the openings corresponding to the inlet 210 and the outlet 220 of the thermal management component 200.

[0051] The step “S300, evacuating the thermal management component 200 and performing a helium background test on the thermal management component 200” can be performed simultaneously with the step “S200, evacuating the storage space 110 to a negative pressure and detecting the pressure change in the storage space 110”. For example, a first vacuum pump 11 is connected to the air vent 120 on the wall of the battery box 100, and a negative pressure is evacuated to the storage space 110 through the first vacuum pump 11; the inlet 210 and the outlet 220 of the thermal management component 200 are connected to the second vacuum pump 12, and the thermal management component 200 is evacuated through the second vacuum pump 12.

[0052] Step “ S200 , applying negative pressure to the accommodation space 110 and detecting pressure changes in the accommodation space 110 ” is a major leak detection of the battery case 100 , and is performed to detect major defects in the battery case 100 .

[0053] Step S300, evacuating the thermal management component 200 and performing a helium background test on the thermal management component 200, includes both a gross leak test and a helium background leak rate test. After evacuating the thermal management component 200, the component is allowed to stand for a period of time to monitor pressure changes within the component, followed by a helium background test. Helium background testing involves calibrating and controlling the ambient background helium concentration of the component under test during helium mass spectrometry leak detection. Its core objective is to eliminate interference from trace amounts of helium in the natural environment and ensure the accuracy of leak detection results.

[0054] like Figure 2As shown, the vent 120 of the battery case 100 is connected to the air inlet of the first vacuum pump 11 via a first pipe 21. The inlet 210 of the thermal management component 200 is connected to the air inlet of the second vacuum pump 12 via a second pipe 22. The outlet 220 of the thermal management component 200 is connected to the air inlet of the second vacuum pump 12 via a third pipe 23. A first solenoid valve 41 is provided on the first pipe 21, located near the air inlet of the first vacuum pump 11. A second solenoid valve 42 is provided on the second pipe 22, located near the air inlet of the second vacuum pump 12. A third solenoid valve 43 is provided on the third pipe 23, located near the air inlet of the second vacuum pump 12. A fourth pipe 24 connects the vent 120 of the battery case 100 to the first differential pressure leak detector 53. A fourth solenoid valve 44 is provided on the fourth pipe 24, located near the first differential pressure leak detector 53. The inlet 210 of the thermal management component 200 is connected to the helium mass spectrometer leak detector 54 via a fifth pipe 25. A fifth solenoid valve 45 is provided on the fifth pipe 25 and is positioned near the helium mass spectrometer leak detector 54. The helium mass spectrometer leak detector 54 is connected to a helium sniffer 55 via a sixth pipe 26. A sixth solenoid valve 46 is provided on the sixth pipe 26 and is positioned near the helium mass spectrometer leak detector 54.

[0055] All valves in the present application are initially closed. For example, the first solenoid valve 41 , the second solenoid valve 42 , the third solenoid valve 43 , the fourth solenoid valve 44 , the fifth solenoid valve 45 and the sixth solenoid valve 46 are initially closed.

[0056] When executing step "S200, applying negative pressure to the storage space 110 and detecting the pressure change in the storage space 110", the first solenoid valve 41 is opened, the first vacuum pump 11 is started, and the pressure value in the storage space 110 is detected by the first pressure sensor 51 arranged at the air vent 120 of the battery box 100. When it is detected that the pressure in the storage space 110 reaches a preset value (such as 0~-5KPa), the pressure is stopped, the first vacuum pump 11 is turned off, the first solenoid valve 41 is closed, and it is left to stand for a period of time. Then, the fourth solenoid valve 44 is opened, and the pressure change in the storage space 110 is detected by the first differential pressure leak detector 53. At the same time, the second solenoid valve 42 and / or the third solenoid valve 43 are opened, the second vacuum pump 12 is started, and the pressure inside the thermal management component 200 is detected by the second pressure sensor 52 disposed on the second pipe 22. When the second pressure sensor 52 detects that the pressure inside the thermal management component 200 has reached a third preset pressure value, the second solenoid valve 42 is closed. When the second pressure sensor 52 detects that the pressure inside the thermal management component 200 has reached a second preset pressure value (the second preset pressure value is less than the third preset pressure value), the third solenoid valve 43 is closed, the second vacuum pump 12 is turned off, and the system is left to stand for a period of time. The pressure change inside the thermal management component 200 is then detected by the second pressure sensor 52. If the pressure change inside the thermal management component 200 detected by the second pressure sensor 52 is less than or equal to the preset value, the thermal management component 200 has passed the major leak test. The fifth solenoid valve 45 is opened, and the helium background leak rate in the thermal management component 200 is detected by the helium mass spectrometer leak detector 54. After the test is completed, the fifth solenoid valve 45 is closed.

[0057] Because the battery case 100 has a large volume and a long sealing interface, step "S400, filling the storage space 110 with helium and detecting the helium leakage rate of the battery case 100" takes a long time to execute. While the storage space 110 is filled with helium and the system is waiting, step "S500, performing a vacuum accumulation helium test on the thermal management component 200" can be executed simultaneously to save detection time. After the thermal management component 200 is evacuated, the helium in the storage space 110 is used to perform vacuum accumulation on the thermal management component 200. After the helium leakage rate of the battery case 100 is detected, the thermal management component 200 is subjected to a vacuum accumulation helium test. The accumulated helium leakage rate is then compared with the benchmark specification for determination. Since the thermal management component 200 is evacuated, there is very little gas in the vacuum and is insensitive to the temperature of the thermal management component 200 and the ambient temperature. Furthermore, the helium mass spectrometer leak detector 54 directly detects the helium leakage rate. The detection process itself is insensitive to temperature, making it compatible with higher product temperatures and ambient temperature fluctuations, thereby improving detection accuracy.

[0058] Vacuum accumulation helium testing is a highly sensitive airtightness testing method. By creating a vacuum environment, helium is allowed to escape from the leak point of the workpiece being tested and accumulate, and then a helium mass spectrometer leak detector is used to quantitatively analyze the leak rate.

[0059] When testing the helium leakage rate of the battery box 100 , the sixth solenoid valve 46 can be opened, and the helium detection sniffer 55 can be moved to scan and test along the sealing interface of the battery box 100 . The helium leakage rates at different positions are recorded and compared with the benchmark specifications for judgment.

[0060] According to the airtightness testing method of the embodiment of the present application, the thermal management component 200 is placed in the storage space 110 of the battery case 100, and the airtightness testing of the battery case 100 and the airtightness testing of the thermal management component 200 can be performed simultaneously, thereby reducing the airtightness testing time and improving the production efficiency of the battery device. Furthermore, the storage space 110 is filled with helium, and the battery case 100 is subjected to helium testing. At the same time, the helium in the storage space 110 is used to perform vacuum accumulation helium testing on the thermal management component 200, which can test the airtightness of high-temperature products with high detection precision and accuracy. In addition, while the battery case 100 is being tested for helium, the thermal management component 200 can be vacuum accumulated, reducing the detection time and improving the production efficiency of the battery device. The battery case 100 and the thermal management component 200 can share the same helium mass spectrometer leak detector 54. After the helium test of the battery case 100 is completed, the thermal management component 200 can be subjected to helium testing, reducing the detection cost and reducing the manufacturing cost.

[0061] According to some embodiments of the present application, filling the accommodating space 110 with helium and detecting the helium leakage rate of the battery box 100 includes: S410 , filling the accommodating space 110 with helium multiple times, and extracting the gas in the accommodating space 110 between two adjacent helium filling operations.

[0062] The step “S410, filling the accommodating space 110 with helium multiple times, and extracting the gas in the accommodating space 110 between two adjacent helium filling actions” can be regarded as a respiratory replacement of the battery case 100, cyclically performing the actions of filling the accommodating space 110 with helium and extracting the gas in the accommodating space 110.

[0063] In some embodiments, as Figure 2 As shown, the vent 120 of the battery case 100 is connected to the helium source 81 via the seventh pipe 27. The seventh pipe 27 is provided with a first pressure regulating valve 61, which is arranged near the helium source 81. The first pressure regulating valve 61 is initially closed. When the first pressure regulating valve 61 is opened, helium is filled into the accommodation space 110.

[0064] In some embodiments, the airtightness detection device further includes a storage tank 71, such as Figure 2As shown, the outlet of the first vacuum pump 11 is connected to the storage tank 71 via the eighth pipe 28, which is provided with a seventh solenoid valve 47, located near the outlet of the first vacuum pump 11. The storage tank 71 is connected to the vent 120 of the battery case 100 via the ninth pipe 29, which is provided with an eighth solenoid valve 48, located near the storage tank 71. The first vacuum pump 11 is arranged in parallel with the ninth pipe 29. The storage tank 71 is connected to a third pressure sensor 56, which is used to detect the pressure in the storage tank 71. The outlet of the storage tank 71 is connected to the twelfth pipe 32, which is provided with a ninth solenoid valve 49, located near the storage tank 71.

[0065] When executing step "S410, filling the accommodating space 110 with helium multiple times and extracting the gas in the accommodating space 110 between two adjacent helium filling actions", the first pressure regulating valve 61 is opened and helium is filled into the accommodating space 110. After the rated flow of helium is filled, the first pressure regulating valve 61 is closed. Then, the first solenoid valve 41 and the seventh solenoid valve 47 are opened, and the first vacuum pump 11 is started. The rated concentration of helium in the storage space 110 of the battery box 100 is drawn into the storage tank 71. When the third pressure sensor 56 detects that the pressure in the storage tank 71 reaches the preset value, the first solenoid valve 41 and the seventh solenoid valve 47 are closed. After standing for a period of time, the eighth solenoid valve 48 is opened, and the high-pressure gas in the storage tank 71 is filled into the storage space 110. After standing for a period of time, the pressure in the storage tank 71 and the storage space 110 is balanced, the eighth solenoid valve 48 is closed, and then the first solenoid valve 41 and the seventh solenoid valve 47 are opened again. The breathing process of the battery box 100 is repeated until the breathing reaches the rated number of times and stops. The breathing of the battery box 100 can accelerate the uniform speed of helium in the storage space 110 and shorten the balancing time.

[0066] The provision of the ninth pipeline 29 can prevent the first vacuum pump 11 from being worn due to frequent starts and stops, thereby increasing the service life of the first vacuum pump 11 .

[0067] In some embodiments, the air vent 120 of the battery box 100 is connected to the air source 83 through the tenth pipe 30. The tenth pipe 30 is provided with a second pressure regulating valve 62. The second pressure regulating valve 62 is arranged close to the air source 83. The tenth pipe 30 is connected to the seventh pipe 27.

[0068] After the battery case 100 reaches the rated number of breaths and stops, the first solenoid valve 41, the seventh solenoid valve 47, and the eighth solenoid valve 48 close, and the storage space 110 contains a uniformly mixed helium gas. A helium detector is installed at the air vent 120 of the battery case 100 to detect the helium concentration in the storage space 110, and the pressure in the storage space 110 is detected by the first pressure sensor 51. The first pressure regulating valve 61 and the second pressure regulating valve 62 are opened and adjusted to the rated opening ratio, so that the helium and air ratio forms a helium mixture at the rated ratio. The helium mixture is then filled into the storage space 110 until the pressure in the storage space 110 reaches the preset pressure value, and the first pressure regulating valve 61 and the second pressure regulating valve 62 are closed. Replenishing the helium mixture into the storage space 110 can ensure that the pressure in the storage space 110 meets the helium detection requirements.

[0069] In the above solution, by filling the containing space 110 with helium multiple times and extracting the gas in the containing space 110 between two adjacent helium filling operations, the uniform speed of the helium in the containing space 110 can be accelerated, the equilibrium time can be shortened, and the detection accuracy can be improved.

[0070] According to some embodiments of the present application, before performing vacuum accumulation helium inspection on the thermal management component 200, the method further includes: S600 , extracting gas from the thermal management component 200 multiple times, and filling nitrogen into the thermal management component 200 between two adjacent gas extraction operations.

[0071] In some embodiments, the air tightness detection device also includes a nitrogen gas source 82. As shown in the figure, the inlet 210 of the thermal management component 200 is connected to the nitrogen gas source 82 through the eleventh pipeline 31. The eleventh pipeline 31 is provided with a third pressure regulating valve 63, and the third pressure regulating valve 63 is arranged close to the nitrogen gas source 82.

[0072] Step “S600, extracting the gas from the thermal management component 200 multiple times, and filling nitrogen into the thermal management component 200 between two adjacent gas extraction actions” can be regarded as respiratory replacement of the thermal management component 200, cyclically performing the actions of extracting the gas from the thermal management component 200 and filling nitrogen into the thermal management component 200.

[0073] When executing step "S410, filling the containing space 110 with helium multiple times, and extracting the gas in the containing space 110 between two adjacent helium filling actions", the step "S600, extracting the gas in the thermal management component 200 multiple times, and filling nitrogen into the thermal management component 200 between two adjacent gas extraction actions" is executed synchronously; the second solenoid valve 42 and the third solenoid valve 43 are opened, the second vacuum pump 12 is started, the pressure in the thermal management component 200 is pumped to a preset value, and the second solenoid valve 42 and the third solenoid valve 43 are closed; then, the third pressure regulating valve 63 is opened, and the nitrogen provided by the nitrogen source 82 is filled into the thermal management component 200. After the pressure in the thermal management component 200 reaches the preset value, the third pressure regulating valve 63 is closed; then the second solenoid valve 42 and the third solenoid valve 43 are opened, and the breathing process of the thermal management component 200 is repeated. The breathing process of the thermal management component 200 can cause the thermal management component 200 to expand and contract, magnify product defects, increase the leakage amount of helium leaking into the thermal management component 200 through the defective position of the thermal management component 200, and improve detection accuracy.

[0074] During the breath replacement process of the thermal management component 200 , the second vacuum pump 12 may be connected to the nitrogen source 82 , and the nitrogen pumped out by the second vacuum pump 12 is delivered to the nitrogen source 82 to achieve recycling of the nitrogen.

[0075] In the above scheme, by extracting the gas in the thermal management component 200 multiple times and filling nitrogen into the thermal management component 200 between two adjacent gas extraction actions, the breathing action of the thermal management component 200 is realized, which can amplify the defects of the thermal management component 200, increase the leakage amount of helium leaking into the thermal management component 200 through the defective position of the thermal management component 200, and improve the detection accuracy.

[0076] According to some embodiments of the present application, during the process of filling the accommodating space 110 with helium and detecting the helium leakage rate value of the battery box 100, the gas in the thermal management component 200 is extracted multiple times simultaneously, and nitrogen is filled into the thermal management component 200 between two adjacent gas extraction actions.

[0077] During the execution of step "S400, filling the accommodating space 110 with helium and detecting the helium leakage rate value of the battery box 100", the battery box 100 is breathed and replaced. The breath replacement time of the battery box 100 is relatively long, and the step "S600, extracting the gas in the thermal management component 200 multiple times, and filling nitrogen into the thermal management component 200 between two adjacent gas extraction actions" can be performed simultaneously, that is, the breath replacement of the battery box 100 and the breath replacement of the thermal management component 200 are performed simultaneously.

[0078] In the above scheme, since the helium detection time of the battery case 100 is relatively long, while the helium detection of the battery case 100 is being performed, the thermal management component 200 is repeatedly subjected to the actions of extracting gas and filling helium. The waiting time for the helium detection of the battery case 100 can be utilized to simultaneously perform the airtightness detection of the battery case 100 and the thermal management component 200, thereby shortening the detection time of the battery device and improving the manufacturing efficiency of the battery device.

[0079] In some embodiments, when the battery case 100 is in a static state of respiratory replacement, the pressure in the accommodating space 110 is detected. If the pressure in the accommodating space 110 is less than a preset value, it is determined that the thermal management component 200 is defective, and the gas in the accommodating space 110 enters the thermal management component 200. Alternatively, it is determined that the battery case 100 is defective, and the gas in the accommodating space 110 leaves the accommodating space 110 through the defect in the battery case 100; if the pressure in the accommodating space 110 is greater than a preset value, it is determined that the thermal management component 200 is defective, and the gas in the thermal management component 200 enters the accommodating space 110.

[0080] According to some embodiments of the present application, after the helium leakage rate of the battery box 100 is checked, a vacuum accumulation helium test is performed on the thermal management component 200 .

[0081] After the breathing action of the battery case 100 is completed and the battery case 100 is subjected to helium testing, helium is contained in the accommodating space 110. At this time, the accommodating space 110 is under positive pressure as a whole, and the breathing replacement of the thermal management component 200 is carried out simultaneously. The thermal management component 200 performs vacuum accumulation, and the airtightness testing of the battery case 100 and the airtightness testing of the thermal management component 200 are carried out simultaneously. After the helium testing of the battery case 100 is completed, the helium testing of the thermal management component 200 is performed to shorten the testing time.

[0082] In the above solution, while performing helium testing on the battery box 100 , the helium in the accommodating space 110 is used to perform vacuum accumulation helium testing on the thermal management component 200 located in the accommodating space 110 , which can shorten the airtightness testing time and improve the testing efficiency.

[0083] According to some embodiments of the present application, after the thermal management component 200 is subjected to a vacuum accumulated helium test, the helium in the accommodating space 110 is extracted and the accommodating space 110 is restored to atmospheric pressure; nitrogen is filled into the interior of the thermal management component 200 and the interior of the thermal management component 200 is restored to atmospheric pressure.

[0084] After completing the air tightness test of the battery box 100 and the air tightness test of the thermal management component 200, the helium in the accommodating space 110 is extracted. The helium can be stored in the storage tank 71 or transported to the helium recovery device via the storage tank 71 to restore the accommodating space 110 to atmospheric pressure; at the same time, nitrogen is filled into the thermal management component 200, and the interior of the thermal management component 200 is restored to atmospheric pressure. The inlet 210 and the outlet 220 of the thermal management component 200 are blocked so that the nitrogen protects the thermal management component 200.

[0085] In the above scheme, the helium in the accommodating space 110 is extracted to realize the recycling of the helium and reduce the pollution of the helium to the environment; nitrogen is filled into the interior of the thermal management component 200 and the interior of the thermal management component 200 is restored to atmospheric pressure. Nitrogen can reduce the oxidation and corrosion of impurities such as oxygen and moisture on the detection components.

[0086] According to some embodiments of the present application, applying negative pressure to the accommodation space 110 and detecting the pressure change in the accommodation space 110 includes: S210, pumping the pressure in the accommodating space 110 to a first preset pressure value, stopping the pumping, letting it stand for a first preset time, and detecting the pressure change in the accommodating space 110. If the pressure change value of the accommodating space 110 is greater than the preset value, stopping the detection; if the pressure change value of the accommodating space 110 is less than or equal to the preset value, filling the accommodating space 110 with helium and detecting the helium leakage rate value of the battery box 100.

[0087] When the accommodation space 110 is in a negative pressure state, by detecting the pressure change in the accommodation space 110 within a first preset time, it can be determined whether the battery box 100 has defects, so as to stop the detection or continue the subsequent detection steps.

[0088] In the above scheme, the pressure in the accommodating space 110 is pumped to a first preset pressure value, the pumping is stopped, and the accommodating space 110 is left to stand for a first preset time. The subsequent action is determined based on the pressure change detected in the accommodating space 110. If the pressure change value of the accommodating space 110 is greater than the preset value, it indicates that there is a defect in the battery case 100, and the detection is stopped and it is judged as an unqualified product. If the pressure change value of the accommodating space 110 is less than or equal to the preset value, it indicates that the battery case 100 is qualified, and the accommodating space 110 is filled with helium, and the battery case 100 is tested for micro-leakage.

[0089] According to some embodiments of the present application, evacuating the thermal management component 200 and performing helium background detection on the thermal management component 200 includes: S310, pumping the pressure in the thermal management component 200 to a second preset pressure value, stopping the pumping, and letting it stand for a second preset time, performing a helium background test on the thermal management component 200. If the helium background leakage rate is greater than the preset value, stopping the test; if the helium background leakage rate is less than or equal to the preset value, filling the accommodating space 110 with helium, testing the helium leakage rate value of the battery box 100, and performing a vacuum accumulation helium test on the thermal management component 200.

[0090] When the interior of the thermal management component 200 is in a vacuum state, the second pressure sensor 52 detects the pressure change inside the thermal management component 200 within the second preset time, so as to determine whether the thermal management component 200 has a defect, that is, a major leak detection is performed on the thermal management component 200. If the pressure change value inside the thermal management component 200 is greater than the preset value, the thermal management component 200 has a defect and the detection is stopped; if the pressure change value inside the thermal management component 200 is less than or equal to the preset value, the major leak detection of the thermal management component 200 passes and a helium background detection is performed: the second solenoid valve 42, the third solenoid valve 43 and the second vacuum pump 12 are closed, the fifth solenoid valve 45 is opened, and a helium background detection is performed on the thermal management component 200 by the helium mass spectrometer leak detector 54.

[0091] In the above scheme, the pressure in the thermal management component 200 is pumped down to a second preset pressure value, the pumping is stopped, the component is left to stand for a second preset time, and the helium background leakage rate of the thermal management component 200 is detected to improve the accuracy of the vacuum cumulative helium test of the thermal management component 200; based on the helium background leakage rate of the thermal management component 200, if the helium body leakage rate is less than or equal to the preset value, it indicates that the product is qualified, and the accommodating space 110 is continuously filled with helium, the helium leakage rate value of the battery box 100 is detected, and the thermal management component 200 is subjected to a vacuum cumulative helium test; if the helium body leakage rate is greater than the preset value, the thermal management component 200 is defective, the product is unqualified, and the test is stopped.

[0092] Please refer to Figure 2 , and further reference Figures 3 to 9 , further introduce the airtightness detection method of this application, Figure 3 Schematic diagram of the negative pressure and vacuum stages provided in some embodiments of the present application, Figure 4 Schematic diagram of the major leak detection and background detection stages provided in some embodiments of the present application, Figure 5 A schematic diagram of the helium filling stage provided in some embodiments of the present application, Figure 6 A schematic diagram of the respiratory replacement phase provided in some embodiments of the present application, Figure 7 A schematic diagram of the detection phase provided in some embodiments of the present application, Figure 8 A schematic diagram of the battery box detection process provided in some embodiments of the present application, Figure 9Schematic diagram of the detection process of the thermal management component provided in some embodiments of the present application, and 8 and Figure 9 OK means the test is passed, and NG means the test is not passed. The present application provides an airtightness detection method, which includes: During the negative pressure and vacuum phase, the first solenoid valve 41, the seventh solenoid valve 47, and the ninth solenoid valve 49 are opened, and the first vacuum pump 11 is activated to apply negative pressure to the accommodation space 110. When the first pressure sensor 51 detects that the pressure in the accommodation space 110 has reached a first preset pressure value, the pressure is stopped and the first vacuum pump 11, the first solenoid valve 41, the seventh solenoid valve 47, and the ninth solenoid valve 49 are closed. Simultaneously, the second solenoid valve 42 and the third solenoid valve 43 are opened, and the second vacuum pump 12 is activated to apply vacuum to the thermal management component 200. When the second pressure sensor 52 detects that the pressure in the thermal management component 200 has reached a third preset pressure value, the second solenoid valve 42 is closed. When the second pressure sensor 52 detects that the pressure in the thermal management component 200 has reached a second preset pressure value (the second preset pressure value is less than the third preset pressure value), the second vacuum pump 12 and the third solenoid valve 43 are closed.

[0093] During the major leak detection and background detection phase, after a period of quiescence, the fourth solenoid valve 44 is opened, and the pressure change in the storage space 110 is detected using the first differential pressure leak detector 53. If the pressure change in the storage space 110 is greater than a preset value, the detection is stopped and the fourth solenoid valve 44 is closed. If the pressure change in the storage space 110 is less than or equal to the preset value, the major leak detection of the battery case 100 has passed, and the fourth solenoid valve 44 is closed. Simultaneously, the pressure change within the thermal management component 200 is detected using the second pressure sensor 52. If the pressure change within the thermal management component 200 is greater than the preset value, the thermal management component 200 is defective, and the detection is stopped. If the pressure change within the thermal management component 200 is less than or equal to the preset value, the major leak detection of the thermal management component 200 has passed, and the helium background detection is performed. Open the fifth solenoid valve 45 and perform a helium background test on the thermal management component 200 using the helium mass spectrometer leak detector 54. If the helium background leak rate is greater than the preset value, stop the test and close the fifth solenoid valve 45; if the helium background leak rate is less than or equal to the preset value, close the fifth solenoid valve 45 and wait for subsequent steps.

[0094] Helium filling stage: open the first pressure regulating valve 61, and the helium provided by the helium source 81 is filled into the accommodating space 110. When the rated flow of helium is filled, close the first pressure regulating valve 61; at the same time, open the third pressure regulating valve 63, and the nitrogen provided by the nitrogen source 82 is filled into the thermal management component 200. When the rated pressure of nitrogen is filled, close the third pressure regulating valve 63.

[0095] Respiratory replacement stage: open the first solenoid valve 41 and the seventh solenoid valve 47, start the first vacuum pump 11, and the rated concentration of helium in the storage space 110 of the battery box 100 is pumped into the storage tank 71. When the third pressure sensor 56 detects that the pressure in the storage tank 71 reaches the preset value, the first solenoid valve 41 and the seventh solenoid valve 47 are closed. After standing for a period of time, the eighth solenoid valve 48 is opened, and the high-pressure gas in the storage tank 71 is filled into the storage space 110. After standing for a period of time, the pressure in the storage tank 71 and the storage space 110 is balanced, the eighth solenoid valve 48 is closed, and then the first solenoid valve is opened again. 41 and the seventh solenoid valve 47, repeat the breathing process of the battery box 100 until the breathing reaches the rated number of times and stops. The breathing of the battery box 100 can accelerate the uniform speed of helium in the containing space 110 and shorten the equilibrium time; then, open the first pressure regulating valve 61 and the second pressure regulating valve 62, adjust the first pressure regulating valve 61 and the second pressure regulating valve 62 to the rated ratio of opening, so that the helium and air are mixed into a helium mixture with a rated ratio, and fill the helium mixture into the containing space 110 until the pressure in the containing space 110 reaches the preset pressure value and stops, and close the first pressure regulating valve 61 and the second pressure regulating valve 62. At the same time, the second solenoid valve 42 and the third solenoid valve 43 are opened, the second vacuum pump 12 is started, the pressure in the thermal management component 200 is pumped to the preset value, and the second solenoid valve 42 and the third solenoid valve 43 are closed; then, the third pressure regulating valve 63 is opened, and the nitrogen provided by the nitrogen source 82 is filled into the thermal management component 200. After the pressure in the thermal management component 200 reaches the preset value, the third pressure regulating valve 63 is closed; then the second solenoid valve 42 and the third solenoid valve 43 are opened, and the breathing process of the thermal management component 200 is repeated.

[0096] During the testing phase, the sixth solenoid valve 46 is opened, and the manipulator 91 drives the helium detection suction gun 55 to scan and detect the sealing interface of the battery case 100. The helium leakage rate at different locations is recorded and compared with the benchmark specifications for determination. The sixth solenoid valve 46 is then closed. While the battery case 100 is being tested for helium, the thermal management component 200 continues to breathe until a fixed time has passed. The breathing action is then stopped, and the thermal management component 200 is evacuated and allowed to accumulate gas. When the helium test of the battery case 100 is completed, the fifth solenoid valve 45 is opened, and the thermal management component 200 is vacuumed and allowed to accumulate gas. The accumulated helium leakage rate is then compared with the benchmark specifications for determination. While the battery case 100 is being tested for helium, the thermal management component 200 is being evacuated and allowed to accumulate gas. This allows the testing of the thermal management component 200 and the battery case 100 to be performed simultaneously, saving a significant amount of testing time. Furthermore, a single helium mass spectrometer can be used to test both cavities, reducing costs.

[0097] Finally, the helium in the accommodation space 110 of the battery box 100 is extracted, and the pressure in the accommodation space 110 is restored to atmospheric pressure; nitrogen is filled into the thermal management component 200, and the pressure in the thermal management component 200 is restored to atmospheric pressure.

[0098] In a second aspect, the present application also provides a controller, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the airtightness detection method provided in the above embodiment is implemented.

[0099] The memory and the processor may be connected via a bus or other means.

[0100] In a third aspect, the present application also provides an airtightness detection system, which includes the controller provided in the above embodiment.

[0101] The airtightness detection system also includes the various valves, vacuum pump, pressure sensor, first differential pressure leak detector 53, helium mass spectrometer leak detector 54, helium detection sniffing gun 55, storage tank 71, helium gas source 81, nitrogen gas source 82, air gas source 83 and the like mentioned above. The controller is electrically connected to the various valves, vacuum pump, pressure sensor, first differential pressure leak detector 53, helium mass spectrometer leak detector 54, helium detection sniffing gun 55, storage tank 71, helium gas source 81, nitrogen gas source 82, air gas source 83 to facilitate the execution of the above-mentioned airtightness detection method.

[0102] In a fourth aspect, the present application also provides a computer-readable storage medium storing computer-executable instructions, which are used to execute the airtightness detection method provided in the above embodiment.

[0103] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those skilled in the art, the term computer storage media is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media generally include computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium. It should be noted that computer-readable storage media may be either non-volatile or volatile.

[0104] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A method for detecting air tightness, characterized in that: include: Placing the thermal management component in the accommodation space of the battery box; pumping negative pressure into the accommodation space to detect pressure changes in the accommodation space; Evacuating the thermal management component and performing a helium background test on the thermal management component; Filling the accommodation space with helium and detecting the helium leakage rate of the battery box; The thermal management component is subjected to a vacuum accumulation helium inspection.

2. The airtightness detection method according to claim 1, characterized in that: Filling the accommodating space with helium and detecting the helium leakage rate of the battery box includes: The accommodating space is filled with helium multiple times, and the gas in the accommodating space is extracted between two adjacent helium filling actions.

3. The airtightness detection method according to claim 2, characterized in that: Before performing vacuum accumulation helium inspection on the thermal management component, the method further includes: The gas in the thermal management component is extracted multiple times, and nitrogen is filled into the thermal management component between two adjacent gas extraction actions.

4. The airtightness detection method according to claim 3, characterized in that: During the process of filling the accommodation space with helium and detecting the helium leakage rate of the battery box, the gas in the thermal management component is extracted multiple times simultaneously, and nitrogen is filled into the thermal management component between two adjacent gas extraction actions.

5. The airtightness detection method according to claim 4, characterized in that: After completing the inspection of the helium leakage rate value of the battery box, the thermal management component is subjected to a vacuum accumulation helium inspection.

6. The airtightness detection method according to claim 1, characterized in that: After the vacuum accumulation helium test is performed on the thermal management component, the helium in the accommodation space is extracted and the accommodation space is restored to atmospheric pressure; nitrogen is filled into the interior of the thermal management component and the interior of the thermal management component is restored to atmospheric pressure.

7. The airtightness detection method according to claim 1, characterized in that: The step of pumping negative pressure into the accommodation space and detecting the pressure change in the accommodation space comprises: The pressure in the accommodating space is pumped down to a first preset pressure value, the pumping is stopped, the battery is left to stand for a first preset time, and the pressure change in the accommodating space is detected. If the pressure change value of the accommodating space is greater than the preset value, the detection is stopped; if the pressure change value of the accommodating space is less than or equal to the preset value, helium is filled into the accommodating space to detect the helium leakage rate of the battery box.

8. The airtightness detection method according to claim 1, characterized in that: The step of evacuating the thermal management component and performing helium background detection on the thermal management component includes: The pressure in the thermal management component is pumped down to a second preset pressure value, the pumping is stopped, and the component is left to stand for a second preset time, and a helium background test is performed on the thermal management component. If the helium background leakage rate is greater than the preset value, the test is stopped; if the helium background leakage rate is less than or equal to the preset value, helium is filled into the accommodation space, and the helium leakage rate of the battery box is tested while a vacuum accumulation helium test is performed on the thermal management component.

9. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the airtightness detection method according to any one of claims 1 to 8 is implemented.

10. An airtightness detection system, characterized in that: Includes the controller according to claim 9.

11. A computer-readable storage medium storing computer-executable instructions, characterized in that: The computer-executable instructions are used to execute the airtightness detection method according to any one of claims 1 to 8.

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