Airtightness detection method, airtightness detection device and gas collection device

Abstract

The embodiment of the invention provides an air tightness detection method, an air tightness detection device and a gas collection device, and the method comprises the steps: obtaining a leakage critical curve of at least one sampling point on a sealing interface of a battery pack, the leakage critical curve being used for representing gas concentrations corresponding to the sampling point at different times; scanning the sealing interface by adopting a gas collection device to obtain the gas concentration of each scanning point on the sealing interface; according to the scanning time corresponding to each scanning point of the gas collection device on the sealing interface and the leakage critical curve of the at least one sampling point, determining a standard threshold value corresponding to each scanning point at different scanning time; and according to the gas concentration of each scanning point on the sealing interface and the standard threshold value corresponding to each scanning point, determining the airtightness detection result of each scanning point. Therefore, the standard threshold value does not need to be determined according to the gas concentration in the battery pack after the battery pack is inflated to the balance state, the airtightness detection can be started from the non-balance state, and the airtightness detection efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of airtightness testing technology, and in particular to an airtightness testing method, an airtightness testing device, and a gas collection device. Background Technology

[0002] In the battery pack manufacturing process, airtightness testing is a crucial step. Airtightness testing typically involves filling the battery pack with a gas of a certain pressure and concentration, such as hydrogen or nitrogen. A gas sampling device is then used to track and draw in gas along the battery pack's sealing interface, collecting any leaking gas and collecting it at a sensor for concentration detection, thus determining whether a leak has occurred at the sealing interface. However, to ensure accurate results, the battery pack often needs to be inflated to an equilibrium state—that is, the gas concentration in all areas of the battery pack needs to be nearly uniform—before the airtightness test. This process inevitably requires a certain amount of time, leading to low testing efficiency. Summary of the Invention

[0003] This application provides an airtightness detection method, an airtightness detection device, and a gas collection device to solve the technical problem of low airtightness detection efficiency.

[0004] In a first aspect, embodiments of this application provide an airtightness detection method, including:

[0005] Obtain the leakage critical curve at at least one sampling point on the sealing interface of the battery pack. The leakage critical curve is used to characterize the gas concentration at the sampling point at different times.

[0006] A gas sampling device is used to scan the sealed interface to obtain the gas concentration at each scanning point on the sealed interface;

[0007] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined.

[0008] Based on the gas concentration at each scanning point on the sealing interface and the corresponding standard threshold, the airtightness test result of each scanning point is determined.

[0009] In this embodiment, the standard threshold corresponding to each scanning point on the sealing interface can be determined based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve obtained from at least one sampling point. This allows for airtightness detection based on the gas concentration collected at each scanning point and the corresponding standard threshold. It eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness detection can begin from the unequilibrium state, improving the efficiency of airtightness detection.

[0010] In some embodiments, a gas sampling device is used to scan the sealed interface to obtain the gas concentration at each scanning point on the sealed interface, including:

[0011] A gas sampling device is used to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0012] In this embodiment, the sealing interface can be scanned according to a preset motion trajectory to perform airtightness detection on each scanning point on the sealing interface in a more standardized manner, reducing the risk of missed detection and improving the accuracy of airtightness detection.

[0013] In some embodiments, a gas sampling device scans the sealing interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface, including:

[0014] A gas collection device is used to scan the sealing interface at a first speed according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface.

[0015] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, before determining the standard threshold corresponding to each scanning point on the sealing interface at different scanning times, the method further includes:

[0016] Based on the preset motion trajectory and the first velocity, the scanning time corresponding to each scanning point on the sealed interface is determined.

[0017] In this embodiment, the scanning time corresponding to each scanning point on the sealing interface can be calculated by using the preset motion trajectory and scanning speed of the gas collection device scanning on the sealing interface, thereby matching the standard threshold corresponding to each scanning point for subsequent airtightness testing.

[0018] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0019] Before using a gas sampling device to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface, the method further includes:

[0020] The preset motion trajectory is determined based on the gas concentration distribution at at least two sampling points;

[0021] In the preset motion trajectory, the gas concentration decreases at at least two sampling points.

[0022] In this embodiment, a preset motion trajectory can be determined based on the gas concentration distribution, prioritizing the scanning of areas with high gas concentration, so that the gas collection device can accurately detect the gas concentration and improve the accuracy of subsequent airtightness detection.

[0023] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0024] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined, including:

[0025] When the location of the first scan point is located at the first sampling point, the first scan point is any scan point on the sealing interface, and the first sampling point is any sampling point of at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the first sampling point.

[0026] When the first scan point is located between the second and third sampling points, and the second and third sampling points are any two adjacent sampling points among at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the second sampling point. At the same time, the gas concentration corresponding to the leakage critical curve of the second sampling point is less than the gas concentration corresponding to the leakage critical curve of the third sampling point.

[0027] In this embodiment, the leakage critical curve at a lower concentration can be used as the basis for leakage judgment to determine the standard threshold, which can improve the situation of missed detection of leaks at the sealing interface and improve the accuracy of airtightness detection.

[0028] In some embodiments, the number of sampling points is one;

[0029] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined, including:

[0030] Based on the scanning time corresponding to each scanning point on the sealed interface of the gas sampling device, and the leakage critical curve of the sampling point, the standard threshold corresponding to each scanning point on the sealed interface at different scanning times is determined.

[0031] In this embodiment, the leakage critical curve of a single sampling point can be directly used to match the standard threshold corresponding to each scanning point on the sealing interface based on the scanning time for airtightness testing. This eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness testing can begin from the non-equilibrium state, thus improving the efficiency of airtightness testing.

[0032] In some embodiments, a gas sampling device is used to scan the sealing interface to obtain the gas concentration at each scanning point on the sealing interface, including:

[0033] A gas sampling device is used to scan the sealed interface at a first speed to obtain the gas concentration at each scanning point on the sealed interface.

[0034] In this embodiment, a fixed first speed can be used to scan the sealing interface, which improves the stability of the gas concentration at each scanning point and thus improves the accuracy of airtightness detection.

[0035] In some embodiments, the airtightness test result of each scanning point is determined based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point, including:

[0036] For each scan point, a first threshold and a second threshold are determined based on a standard threshold, wherein the values ​​of the first threshold, the standard threshold, and the second threshold increase sequentially.

[0037] Based on the gas concentration at each scanning point on the sealing interface, and the first and second thresholds corresponding to each scanning point, the airtightness test result of each scanning point is determined.

[0038] In this embodiment, a smaller first threshold and a larger second threshold can be determined based on a standard threshold, thereby using the first threshold and the second threshold as the judgment criteria for no leakage and leakage, respectively, which improves the accuracy of the detection results.

[0039] In some embodiments, the airtightness detection result of each scanning point is determined based on the gas concentration at each scanning point on the sealing interface, and the first threshold and the second threshold corresponding to each scanning point, including:

[0040] If the gas concentration at the second scan point is less than or equal to the first threshold corresponding to the second scan point, it is determined that there is no gas leakage at the second scan point.

[0041] If the gas concentration at the second scan point is greater than or equal to the second threshold corresponding to the second scan point, it is determined that there is a gas leak at the second scan point.

[0042] The second scan point is any scan point on the sealed interface.

[0043] In this embodiment, a smaller first threshold is used as the criterion for judging no leakage, and a larger second threshold is used as the criterion for judging leakage. This improves both the efficiency and accuracy of the airtightness detection.

[0044] In some embodiments, determining the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface, and the first threshold and second threshold corresponding to each scanning point, further includes:

[0045] When the gas concentration at the second scanning point is greater than the first threshold and less than the second threshold, the gas collection device scans the target area at a second speed according to the preset moving starting point to obtain the gas concentration of the target area; wherein, the second scanning point is any scanning point on the sealing interface, the target area is the area adjacent to the second scanning point on the sealing interface, and the second speed is less than the first speed;

[0046] Based on the gas concentration in the target area and the standard threshold corresponding to the second scanning point, the airtightness detection result of the second scanning point is determined.

[0047] In this embodiment, a slower second speed is used to rescan areas where leaks may exist, thereby more accurately determining whether a gas leak has occurred in that area.

[0048] In some embodiments, the preset starting point of movement is located in the opposite direction of the second scanning point along the preset motion trajectory, and the distance between the preset starting point of movement and the second scanning point is a preset distance threshold.

[0049] In this embodiment, in areas where leaks may exist, scanning can begin at a slower second speed a certain distance ahead to avoid missing leaks and further improve the accuracy of airtightness detection.

[0050] In some embodiments, the gas collection device includes a first gas collection device and a second gas collection device, wherein the first gas collection device is used to scan the sealing interface at a first speed, and the second gas collection device is used to scan the target area at a second speed.

[0051] In this embodiment, different gas sampling devices can be used to perform fast and slow scans respectively, further improving the efficiency of airtightness detection.

[0052] In some embodiments, if the airtightness test result at the second scan point indicates a leak at the second scan point, the method further includes:

[0053] The location of the leak is determined based on the preset starting point of movement, the inner radius of the suction tube of the gas collection device, the length of the suction tube, the suction speed of the suction tube, the time corresponding to the response signal peak during the gas concentration detection process, and the second speed.

[0054] In this embodiment, if a leak is determined to exist, the leak location can be calculated more precisely.

[0055] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0056] Before obtaining the leakage critical curve at at least one sampling point on the sealing interface of the battery pack, the method further includes:

[0057] At least two sampling points are set on the sealed interface of the battery pack. The positions of the at least two sampling points are determined by the gas concentration distribution inside the battery pack during the battery pack inflation process.

[0058] In this embodiment, the positions of at least two sampling points can be determined based on the gas distribution inside the battery pack, making the distribution of at least two sampling points more reasonable.

[0059] In some embodiments, when the gas concentration change in the first space inside the battery pack is less than the gas concentration change in the second space, the spacing between sampling points on the sealing interface corresponding to the first space is greater than the spacing between sampling points on the sealing interface corresponding to the second space.

[0060] In this embodiment, the space with smaller gas concentration changes has a larger spacing between the corresponding sampling points, so that the distribution of at least one sampling point is more reasonable.

[0061] In some embodiments, obtaining the leakage critical curve at at least one sampling point on the sealing interface of the battery pack includes:

[0062] Gas concentration simulation was performed at at least one sampling point on the sealed interface of the battery pack to obtain the leakage critical curve at at least one sampling point.

[0063] In this embodiment, the leakage critical curve of at least one sampling point in the battery pack can be obtained by gas concentration simulation, laying the foundation for airtightness detection.

[0064] Secondly, embodiments of this application also provide an airtightness detection device, comprising:

[0065] The first acquisition module is used to acquire the leakage critical curve of at least one sampling point on the sealing interface of the battery pack. The leakage critical curve is used to characterize the gas concentration at the sampling point at different times.

[0066] The second acquisition module is used to scan the sealed interface with a gas collection device and acquire the gas concentration at each scanning point on the sealed interface.

[0067] The first determining module is used to determine the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device and the leakage critical curve of at least one sampling point.

[0068] The second determining module is used to determine the airtightness test result of each scanning point based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point.

[0069] In this embodiment, the standard threshold corresponding to each scanning point on the sealing interface can be determined based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve obtained from at least one sampling point. This allows for airtightness detection based on the gas concentration collected at each scanning point and the corresponding standard threshold. It eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness detection can begin from the unequilibrium state, improving the efficiency of airtightness detection.

[0070] In some embodiments, the second acquisition module is further configured to:

[0071] A gas sampling device is used to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0072] In this embodiment, the sealing interface can be scanned according to a preset motion trajectory to perform airtightness detection on each scanning point on the sealing interface in a more standardized manner, reducing the risk of missed detection and improving the accuracy of airtightness detection.

[0073] In some embodiments, the second acquisition module is further configured to:

[0074] A gas collection device is used to scan the sealing interface at a first speed according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface.

[0075] The airtightness testing device also includes:

[0076] The third determining module is used to determine the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device and the leakage critical curve of at least one sampling point, and to determine the scanning time corresponding to each scanning point on the sealing interface based on the preset motion trajectory and the first velocity.

[0077] In this embodiment, the scanning time corresponding to each scanning point on the sealing interface can be calculated by using the preset motion trajectory and scanning speed of the gas collection device scanning on the sealing interface, thereby matching the standard threshold corresponding to each scanning point for subsequent airtightness testing.

[0078] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0079] The airtightness testing device also includes:

[0080] The fourth determining module is used to determine the preset motion trajectory based on the gas concentration distribution of at least two sampling points before scanning the sealed interface with the gas sampling device according to the preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0081] In the preset motion trajectory, the gas concentration decreases at at least two sampling points.

[0082] In this embodiment, a preset motion trajectory can be determined based on the gas concentration distribution, prioritizing the scanning of areas with high gas concentration, so that the gas collection device can accurately detect the gas concentration and improve the accuracy of subsequent airtightness detection.

[0083] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0084] The first determining module is also used for:

[0085] When the location of the first scan point is located at the first sampling point, the first scan point is any scan point on the sealing interface, and the first sampling point is any sampling point of at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the first sampling point.

[0086] When the first scan point is located between the second and third sampling points, and the second and third sampling points are any two adjacent sampling points among at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the second sampling point. At the same time, the gas concentration corresponding to the leakage critical curve of the second sampling point is less than the gas concentration corresponding to the leakage critical curve of the third sampling point.

[0087] In this embodiment, the leakage critical curve at a lower concentration can be used as the basis for leakage judgment to determine the standard threshold, which can improve the situation of missed detection of leaks at the sealing interface and improve the accuracy of airtightness detection.

[0088] In some embodiments, the number of sampling points is one;

[0089] The first determining module is also used for:

[0090] Based on the scanning time corresponding to each scanning point on the sealed interface of the gas sampling device, and the leakage critical curve of the sampling point, the standard threshold corresponding to each scanning point on the sealed interface at different scanning times is determined.

[0091] In this embodiment, the leakage critical curve of a single sampling point can be directly used to match the standard threshold corresponding to each scanning point on the sealing interface based on the scanning time for airtightness testing. This eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness testing can begin from the non-equilibrium state, thus improving the efficiency of airtightness testing.

[0092] In some embodiments, the second acquisition module is further configured to:

[0093] A gas sampling device is used to scan the sealed interface at a first speed to obtain the gas concentration at each scanning point on the sealed interface.

[0094] In this embodiment, a fixed first speed can be used to scan the sealing interface, which improves the stability of the gas concentration at each scanning point and thus improves the accuracy of airtightness detection.

[0095] In some embodiments, the second determining module can also be used for:

[0096] For each scan point, a first threshold and a second threshold are determined based on a standard threshold, wherein the values ​​of the first threshold, the standard threshold, and the second threshold increase sequentially.

[0097] Based on the gas concentration at each scanning point on the sealing interface, and the first and second thresholds corresponding to each scanning point, the airtightness test result of each scanning point is determined.

[0098] In this embodiment, the sealing interface can be scanned at a faster first speed, and a smaller first threshold and a larger second threshold can be determined according to a standard threshold. The first threshold and the second threshold are then used as the criteria for judging whether there is no leakage and whether there is leakage, respectively. This improves the efficiency of airtightness detection and the accuracy of the detection results.

[0099] In some embodiments, the second determining module is further configured to:

[0100] If the gas concentration at the second scan point is less than or equal to the first threshold corresponding to the second scan point, it is determined that there is no gas leakage at the second scan point.

[0101] If the gas concentration at the second scan point is greater than or equal to the second threshold corresponding to the second scan point, it is determined that there is a gas leak at the second scan point.

[0102] The second scan point is any scan point on the sealed interface.

[0103] In this embodiment, a smaller first threshold is used as the criterion for judging no leakage, and a larger second threshold is used as the criterion for judging leakage. This improves both the efficiency and accuracy of the airtightness detection.

[0104] In some embodiments, the second determining module is further configured to:

[0105] When the gas concentration at the second scanning point is greater than the first threshold and less than the second threshold, the gas collection device scans the target area at a second speed according to the preset moving starting point to obtain the gas concentration of the target area; wherein, the second scanning point is any scanning point on the sealing interface, the target area is the area adjacent to the second scanning point on the sealing interface, and the second speed is less than the first speed;

[0106] Based on the gas concentration in the target area and the standard threshold corresponding to the second scanning point, the airtightness detection result of the second scanning point is determined.

[0107] In this embodiment, a slower second speed is used to rescan areas where leaks may exist, thereby more accurately determining whether a gas leak has occurred in that area.

[0108] In some embodiments, the preset starting point of movement is located in the opposite direction of the second scanning point along the preset motion trajectory, and the distance between the preset starting point of movement and the second scanning point is a preset distance threshold.

[0109] In this embodiment, in areas where leaks may exist, scanning can begin at a slower second speed a certain distance ahead to avoid missing leaks and further improve the accuracy of airtightness detection.

[0110] In some embodiments, the gas collection device includes a first gas collection device and a second gas collection device, wherein the first gas collection device is used to scan the sealing interface at a first speed, and the second gas collection device is used to scan the target area at a second speed.

[0111] In this embodiment, different gas sampling devices can be used to perform fast and slow scans respectively, further improving the efficiency of airtightness detection.

[0112] In some embodiments, the apparatus further includes:

[0113] The fifth determining module is used to determine the location of the leak based on the preset starting point of movement, the inner radius of the suction tube of the gas collection device, the length of the suction tube, the suction speed of the suction tube, the time corresponding to the response signal peak during the gas concentration detection process, and the second speed.

[0114] In this embodiment, if a leak is determined to exist, the leak location can be calculated more precisely.

[0115] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0116] The airtightness testing device also includes:

[0117] The setting module is used to set at least two sampling points on the sealed interface of the battery pack. The positions of the at least two sampling points are determined by the gas concentration distribution inside the battery pack during the battery pack inflation process.

[0118] In this embodiment, the positions of at least two sampling points can be determined based on the gas distribution inside the battery pack, making the distribution of at least two sampling points more reasonable.

[0119] In some embodiments, when the gas concentration change in the first space inside the battery pack is less than the gas concentration change in the second space, the spacing between sampling points on the sealing interface corresponding to the first space is greater than the spacing between sampling points on the sealing interface corresponding to the second space.

[0120] In this embodiment, the space with smaller gas concentration changes has a larger spacing between the corresponding sampling points, so that the distribution of at least one sampling point is more reasonable.

[0121] In some embodiments, the first acquisition module is further configured to:

[0122] Gas concentration simulation was performed at at least one sampling point on the sealed interface of the battery pack to obtain the leakage critical curve at at least one sampling point.

[0123] In this embodiment, the leakage critical curve of at least one sampling point in the battery pack can be obtained by gas concentration simulation, laying the foundation for airtightness detection.

[0124] Thirdly, embodiments of this application provide a gas collection device, comprising:

[0125] Inhalation tube;

[0126] A gas gathering assembly has at least one first surface flush with the sealing interface of the battery pack. The gas gathering assembly has a through hole that penetrates the first surface, and one end of the intake pipe is disposed in the through hole.

[0127] In this embodiment, the gas collection device can prevent gas from overflowing around the suction tube when the suction tube is drawing in gas through the gas gathering component, thereby allowing more gas to be collected by the suction tube. This enables the collection of enough gas to trigger the sensor response in a shorter time, thus increasing the speed at which the gas collection device scans the battery pack sealing interface. This improves the detection efficiency while ensuring the accuracy of the airtightness detection results.

[0128] In some embodiments, the gas gathering component is a baffle with through holes.

[0129] In this embodiment, a baffle can be used to prevent gas on the sealing interface from overflowing to the surrounding area of ​​the suction pipe, thereby enabling the collection of enough gas to trigger the sensor in a shorter time, ensuring the accuracy of the airtightness detection results while improving detection efficiency.

[0130] In some embodiments, the gas concentrating assembly includes:

[0131] The first baffle portion and the second baffle portion are connected and form an included angle;

[0132] The through hole is located in the first baffle section or the second baffle section.

[0133] In this embodiment, the first baffle and the second baffle can prevent the gas at the corner of the sealing interface from overflowing to the surrounding area of ​​the suction pipe, thereby enabling the collection of enough gas for the sensor response in a shorter time, ensuring the accuracy of the airtightness detection results while improving detection efficiency.

[0134] In some embodiments, a through hole is formed at the connection between the first baffle portion and the second baffle portion.

[0135] In this embodiment, the suction pipe is located at the connection between the first baffle and the second baffle, which ensures that more gas is collected by the suction pipe, further improving the scanning speed of the gas collection device and thus further improving the airtightness detection efficiency.

[0136] In some embodiments, the first baffle portion and the second baffle portion are movably connected;

[0137] The device also includes a stretching assembly, which is connected to at least one of the first baffle portion and the second baffle portion to switch between the first state and the second state of the gas gathering assembly.

[0138] In the first state, the first baffle portion and the second baffle portion form an angle; in the second state, the first baffle portion and the second baffle portion are on the same plane.

[0139] In this embodiment, the gas collection device can also switch the different states of the gas gathering component by stretching the component, so that the first baffle and the second baffle can form an angle when scanning the corner of the sealing interface, and can be on the same plane when scanning the sealing interface plane, making it more flexible and applicable to a variety of scanning scenarios.

[0140] In some embodiments, the apparatus further includes:

[0141] The detection chamber is connected to the end of the suction tube furthest from the gas gathering component;

[0142] The sensor, located in the detection chamber, is used to detect the gas concentration collected by the inhalation tube.

[0143] In this embodiment, a sensor can be installed in the detection chamber of the gas collection device to detect the gas concentration collected by the suction tube, which facilitates subsequent airtightness testing.

[0144] Fourthly, embodiments of this application provide an electronic device, the device including: a processor and a memory storing program instructions; the processor executes the program instructions to implement the method of the first aspect.

[0145] Fifthly, embodiments of this application provide a machine-readable storage medium storing program instructions, which, when executed by a processor, implement the method of the first aspect.

[0146] In a sixth aspect, embodiments of this application provide a computer program product in which instructions, when executed by a processor of an electronic device, cause the electronic device to perform the method of the first aspect.

[0147] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0148] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0149] Figure 1 This is a schematic diagram of the structure of a gas collection device provided in an embodiment of this application;

[0150] Figure 2 This is a schematic diagram of a gas gathering component in a gas collection device provided in an embodiment of this application;

[0151] Figure 3 This is another schematic diagram of the gas collection device provided in the embodiments of this application;

[0152] Figure 4 A schematic flowchart of the airtightness detection method provided in the embodiments of this application;

[0153] Figure 5 A schematic diagram of at least one sampling point in the airtightness detection method provided in the embodiments of this application;

[0154] Figure 6A schematic diagram of the leakage critical curve corresponding to the sampling point in the airtightness detection method provided in the embodiments of this application;

[0155] Figure 7 This is a schematic diagram illustrating the determination of a standard threshold based on a leakage critical curve in the airtightness detection method provided in the embodiments of this application.

[0156] Figure 8 A schematic diagram of scanning the sealing interface at a first speed and a second speed in the airtightness detection method provided in the embodiments of this application;

[0157] Figure 9 A flowchart illustrating a specific scenario embodiment of the airtightness detection method provided in this application;

[0158] Figure 10 This is a schematic diagram of the airtightness detection device provided in the embodiments of this application;

[0159] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0160] The accompanying drawings are not drawn to scale.

[0161] Figure label:

[0162] 100. Battery pack; 101. Sealing interface; 10. Gas collection device; 11. Inhalation pipe; 12. Gas gathering assembly; 121. Through hole; 122. Baffle; 123. First baffle part; 124. Second baffle part. Detailed Implementation

[0163] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0164] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0165] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0166] In related technologies, during the entire airtightness testing process, a testing gas can be introduced into the battery pack. Initially, when the testing gas replaces the air in the battery pack, the battery pack is in a non-equilibrium state due to the different distances between different areas of the battery pack and the gas inlet. At this time, the gas concentration of the testing gas in different areas is uneven, with higher gas concentrations near the gas inlet and lower concentrations further away. This non-equilibrium state often takes up a significant amount of time. Concentration testing only begins after the gas concentrations in all areas of the battery pack have stabilized, resulting in low airtightness testing efficiency.

[0167] The applicant envisioned using theoretical simulations to construct standard leak gas concentration change curves at various scanning points on the battery pack as critical leakage curves under non-equilibrium conditions. By matching the scanning time to a standard threshold for determining leakage, the applicant could fully utilize the initial non-equilibrium period to begin gas tightness testing earlier. However, this requires obtaining critical leakage curves at various locations on the battery pack through theoretical simulations. In actual testing, the location of leaks on the sealing interface cannot be predicted, making it difficult to simulate the numerous points on the battery pack. This is currently the key challenge in conducting gas tightness testing under non-equilibrium conditions.

[0168] Furthermore, as time progresses, the concentration of the gas being detected in the battery pack increases. Performing airtightness testing at the beginning of the charging phase may result in insufficient sensor response due to excessively low gas concentration, leading to unstable test results. Therefore, it is difficult to simultaneously meet the requirements for both efficiency and accuracy in airtightness testing.

[0169] To address the aforementioned problems, embodiments of this application provide an airtightness detection method, an airtightness detection device, and a gas collection device. The gas collection device for scanning the sealing interface of a battery pack, provided in this application embodiment, is described below first.

[0170] like Figure 1 and Figure 2 As shown, this application embodiment provides a gas collection device 10, including:

[0171] Inhalation tube 11;

[0172] The gas gathering component 12 has at least one first surface that is flush with the sealing interface 101 of the battery pack 100. The gas gathering component 12 has a through hole 121 that penetrates the first surface, and one end of the suction pipe 11 is disposed in the through hole 121.

[0173] In this embodiment, the gas collection device 10 may include a suction pipe 11 and a gas gathering component 12. The gas gathering component 12 has at least one first surface that is flush with the sealing interface 101 of the battery pack 100. When the gas collection device 10 scans the sealing interface 101, the first surface can be as close as possible to the surface of the battery pack 100 so that any gas that may leak at the sealing interface 101 will not overflow to the surroundings.

[0174] A through hole 121 can be formed on the gas gathering component 12, penetrating the first surface, and one end of the suction pipe 11 is disposed in the through hole 121. The other end of the suction pipe 11 can be connected to the detection chamber, so that as much leaked gas as possible can be collected by the suction pipe 11 into the detection chamber to detect the gas concentration of the detection gas collected by the suction pipe 11, and then the presence of a leak in the sealing interface 101 can be determined based on the gas concentration.

[0175] Understandably, during airtightness testing, a detection gas can be introduced into the battery pack to replace the air inside. The detection gas can be set according to actual needs and is not specifically limited here. For example, the detection gas can be nitrogen or a mixture of hydrogen and nitrogen. Taking a mixture of 5% hydrogen and 95% nitrogen by volume as an example, the gas concentration collected by the suction tube 11 can refer to the concentration of hydrogen collected.

[0176] In this embodiment, the gas collection device 10 can prevent gas from overflowing around the suction pipe 11 when the suction pipe 11 is drawing gas through the gas gathering component 12, thereby allowing more gas to be collected by the suction pipe 11. This enables the collection of enough gas to trigger the sensor response in a shorter time, thus increasing the speed at which the gas collection device 10 scans the sealing interface 101 of the battery pack 100, thereby improving detection efficiency while ensuring the accuracy of the airtightness detection results.

[0177] In some embodiments, the gas gathering component 12 is a baffle 122, and the baffle 122 has a through hole 121.

[0178] In this embodiment, as Figure 2As shown, the gas gathering component 12 can be a baffle 122, with a through hole 121 on the baffle 122, and the suction pipe 11 can be disposed in the through hole 121. The shape of the baffle 122 can be set according to actual needs, such as being circular, semi-circular, or square, etc., and is not specifically limited here.

[0179] In this embodiment, the baffle 122 can be used to prevent the gas on the sealing interface 101 from overflowing to the surrounding area of ​​the suction pipe 11, thereby enabling the collection of enough gas for the sensor response in a shorter time, ensuring the accuracy of the airtightness detection results while improving detection efficiency.

[0180] In some embodiments, the gas concentrating assembly 12 includes:

[0181] The first baffle portion 123 and the second baffle portion 124 are connected and form an angle;

[0182] The through hole 121 is formed in the first baffle portion 123 or the second baffle portion 124.

[0183] like Figure 3 As shown, the gas concentrating assembly 12 may include a first baffle portion 123 and a second baffle portion 124 connected in sequence, and the first baffle portion 123 and the second baffle portion 124 may form an angle. The angle of the angle can be set according to the shape of the battery pack 100. For example, if the battery pack 100 is cuboid, the angle between the first baffle portion 123 and the second baffle portion 124 can be 90°.

[0184] A through hole 121 may be provided on the first baffle portion 123 or the second baffle portion 124 for setting the suction pipe 11.

[0185] When it is necessary to scan whether there is air leakage at the corner of the sealing interface 101 of the battery pack 100, the first baffle portion 123 and the second baffle portion 124 can respectively be close to two adjacent surfaces of the battery pack 100.

[0186] In other examples, when detecting whether there is air leakage at the plane of the sealing interface 101, one of the first baffle portion 123 and the second baffle portion 124 can be placed close to the sealing interface 101, and the other can be placed close to the adjacent surface of the sealing interface 101 for scanning detection. In this case, the through hole 121 can be formed on the one of the first baffle portion 123 and the second baffle portion 124 that is close to the sealing interface 101, so that the suction pipe 11 can collect the gas that may leak from the sealing interface 101.

[0187] In this embodiment, the first baffle portion 123 and the second baffle portion 124 can be used to prevent the gas at the corner of the sealing interface 101 from overflowing to the surrounding area of ​​the suction pipe 11, thereby enabling the collection of enough gas for the sensor response in a shorter time, ensuring the accuracy of the airtightness detection results while improving detection efficiency.

[0188] In some embodiments, a through hole 121 is formed at the connection between the first baffle portion 123 and the second baffle portion 124.

[0189] In this embodiment, as Figure 3 As shown, the through hole 121 can be opened at the connection between the first baffle portion 123 and the second baffle portion 124, so that the suction pipe 11 can collect gas at the connection between the first baffle portion 123 and the second baffle portion 124.

[0190] In this embodiment, the suction pipe 11 is located at the connection between the first baffle portion 123 and the second baffle portion 124, thus ensuring that more gas is collected by the suction pipe 11, further improving the scanning speed of the gas collection device 10, and thereby further improving the airtightness detection efficiency.

[0191] In some embodiments, the first baffle portion 123 and the second baffle portion 124 are movably connected;

[0192] The gas collection device 10 also includes a tensioning assembly, which is connected to the first baffle.

[0193] At least one of the first and second baffle sections 124 is connected to switch the first and second states of the gas gathering assembly 12;

[0194] In the first state, the first baffle portion 123 and the second baffle portion 124 form an angle; in the second state, the first baffle portion 123 and the second baffle portion 124 are on the same plane.

[0195] In this embodiment, the first baffle portion 123 and the second baffle portion 124 are movably connected, so that the first baffle portion 123 can move relative to the second baffle portion 124.

[0196] The gas collection device 10 may also include a tensioning assembly (not shown in the figure), which may be a spring or a movable connecting rod. The first baffle portion 123 and the second baffle portion 124 may move relative to each other under the action of the tensioning assembly, so that when scanning the sealing interface 101 at different positions, the first baffle portion 123 and the second baffle portion 124 are in a first state forming an angle, or in a second state moving to the same plane.

[0197] In this embodiment, the gas collection device 10 can also switch the different states of the gas gathering component 12 by stretching the component, so that the first baffle part 123 and the second baffle part 124 can form an angle when scanning the corner of the sealing interface 101, and can be on the same plane when scanning the plane of the sealing interface 101, making it more flexible to use and applicable to a variety of scanning scenarios.

[0198] In some embodiments, the gas collection device 10 further includes:

[0199] The detection chamber is connected to the end of the suction tube 11 that is furthest from the gas gathering component 12;

[0200] The sensor, located in the detection chamber, is used to detect the gas concentration collected by the inhalation tube 11.

[0201] In this embodiment, one end of the suction tube 11 can be disposed in the through hole 121 of the gas gathering component 12, and the other end can be connected to the detection chamber (not shown in the figure). The gas collection device 10 may also include a sensor (not shown in the figure), which may be disposed in the detection chamber and used to detect the gas concentration collected by the suction tube 11.

[0202] In this embodiment, a sensor can be installed inside the gas collection device 10, which can detect the gas concentration collected by the suction pipe 11 through the sensor, which facilitates subsequent air tightness testing.

[0203] This application also provides an airtightness detection method using the above-described gas sampling device. Please refer to... Figure 4 , Figure 4 An airtightness testing method provided in this application embodiment may include:

[0204] Step 401: Obtain the leakage critical curve of at least one sampling point on the sealing interface of the battery pack. The leakage critical curve is used to characterize the gas concentration at the sampling point at different times.

[0205] In step 401, sampling points can be set on the sealed interface of the battery pack. The number of sampling points can be one or more.

[0206] Taking a single sampling point as an example, if the battery pack is small in size and the air inlet is located near the middle of the battery pack, then the gas concentration can be evenly distributed within a short period of time when the battery pack is being filled with gas. Thus, the gas concentration at a single sampling point can reflect the gas concentration within the entire battery pack.

[0207] Taking multiple sampling points as an example, multiple sampling points can be set on the sealed interface at a preset fixed interval. Alternatively, multiple sampling points can be set on the sealed interface based on practical experience; for example, based on practical experience, sampling points with shorter intervals can be set for locations prone to leakage, while sampling points with longer intervals can be set for locations less prone to leakage. Multiple sampling points can also be set based on changes in gas concentration inside the battery pack. The distribution of sampling points can be set according to actual needs and is not specifically limited here.

[0208] like Figure 5 As shown, the battery pack model can have an inflation port 501 and an exhaust port 502 to replace the air inside the battery pack with a detection gas. Nine sampling points a to i can be set at certain intervals. The detection gas can be set according to actual needs and is not specifically limited here. For example, the detection gas can be nitrogen or a mixture of hydrogen and nitrogen. Taking a mixture of 5% hydrogen and 95% nitrogen as an example, the hydrogen leakage concentration change curve over time at each sampling point can be obtained through actual measurement or simulation, i.e., the leakage critical curve. For example, the leakage critical curves for sampling points d and e can be as follows: Figure 6 As shown.

[0209] Step 402: Use a gas sampling device to scan the sealed interface and obtain the gas concentration at each scanning point on the sealed interface.

[0210] In step 402, the gas collection device scans the sealing interface. At this time, the gas collection device's suction tube can collect any gas that may be leaking from the sealing interface and send it to the detection chamber to detect the gas concentration, so that the gas concentration at each scanning point on the sealing interface collected by the gas collection device can be obtained.

[0211] Step 403: Based on the scanning time corresponding to each scanning point on the sealed interface of the gas sampling device and the leakage critical curve of at least one sampling point, determine the standard threshold corresponding to each scanning point on the sealed interface at different scanning times.

[0212] In step 402, when the gas sampling device scans the sealed interface, it can use a counter to time the scan and thus determine the scanning time corresponding to each scanning point on the sealed interface. Alternatively, it can scan the sealed interface using a preset motion trajectory, and calculate the scanning time corresponding to each scanning point based on the preset motion trajectory and scanning speed.

[0213] Understandably, when there is only one sampling point, the standard threshold corresponding to that sampling point can be determined directly from its leakage critical curve based on the scan time. When there are multiple sampling points, and the scanning point is located between two sampling points, the leakage critical curve of one of the sampling points can be used as the leakage critical curve for that location, and the standard threshold can be matched from this curve based on the scan time. Alternatively, both leakage critical curves can be used as the leakage judgment criteria, and the standard threshold corresponding to that scanning point can be calculated by weighting the distance between the scanning point and the two sampling points. The specific settings can be configured according to actual needs and are not specifically limited here.

[0214] Step 404: Determine the airtightness test result of each scanning point based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point.

[0215] In step 404, the gas concentration at each scanning point can be compared with its corresponding standard threshold, such as... Figure 7 As shown, if the gas concentration is greater than or equal to the standard threshold, it can be considered that there is a leak at that location, i.e., there is a leak at that location. If the gas concentration is less than the standard threshold, it can be considered that there is no leak at that location.

[0216] Understandably, during the entire air tightness test process, the initial non-equilibrium state of air replacement takes up a significant amount of time. Generally, gas concentration testing can only begin after the gas concentration in each area of ​​the battery pack has stabilized and reached equilibrium. This results in low air tightness testing efficiency.

[0217] In this embodiment, a finite number of sampling points are selected at certain intervals on the battery pack to obtain the leakage critical curves of these sampling points, without needing to obtain the leakage critical curves of all locations on the battery pack. During actual airtightness testing, the leakage critical curves of two adjacent sampling points within a corresponding location interval can be found based on the location of the scanning point. Furthermore, a standard threshold can be determined as the judgment value for airtightness testing based on the leakage critical curves of the two sampling points.

[0218] In this embodiment, the standard threshold corresponding to each scanning point on the sealing interface can be determined based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve obtained from at least one sampling point. This allows for airtightness detection based on the gas concentration collected at each scanning point and the corresponding standard threshold. It eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness detection can begin from the unequilibrium state, improving the efficiency of airtightness detection.

[0219] In some embodiments, a gas sampling device is used to scan the sealed interface to obtain the gas concentration at each scanning point on the sealed interface, including:

[0220] A gas sampling device is used to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0221] In this embodiment, the preset motion trajectory of the gas sampling device scanning the sealed interface can be set according to actual needs. For example, as Figure 5 As shown, the gas sampling device moves along the arrow-shaped line, from near the inlet 501 to near the outlet 502. Taking the starting point 603 as the sampling point g as an example, the preset motion trajectory can be "gfedcbaghi" or "gfeghiedcba". It is understood that the above preset motion trajectory is only an example, and the preset motion trajectory is not specifically limited here.

[0222] The gas collection device can scan the sealed interface according to the preset motion trajectory mentioned above to obtain the gas concentration at each scanning point on the sealed interface.

[0223] In this embodiment, the sealing interface can be scanned according to a preset motion trajectory to perform airtightness detection on each scanning point on the sealing interface in a more standardized manner, reducing the risk of missed detection and improving the accuracy of airtightness detection.

[0224] In some embodiments, a gas sampling device scans the sealing interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface, including:

[0225] A gas collection device is used to scan the sealing interface at a first speed according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface.

[0226] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, before determining the standard threshold corresponding to each scanning point on the sealing interface at different scanning times, the method further includes:

[0227] Based on the preset motion trajectory and the first velocity, the scanning time corresponding to each scanning point on the sealed interface is determined.

[0228] In this embodiment, the gas collection device generally scans the sealed interface at a fixed speed, namely a first speed, to obtain the gas concentration at each scanning point on the sealed interface.

[0229] Given the preset motion trajectory, the displacement of the gas collection device on the sealed interface can be determined, and the scanning time corresponding to each scanning point detected by the gas collection device can be calculated based on the first velocity of the gas collection device scanning the sealed interface.

[0230] Understandably, the scanning time for detecting each scanning point can be a corresponding time interval to improve the robustness of the standard threshold determination.

[0231] In this embodiment, the scanning time corresponding to each scanning point on the sealing interface can be calculated by using the preset motion trajectory and scanning speed of the gas collection device scanning on the sealing interface, thereby matching the standard threshold corresponding to each scanning point for subsequent airtightness testing.

[0232] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0233] Before using a gas sampling device to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface, the method further includes:

[0234] The preset motion trajectory is determined based on the gas concentration distribution at at least two sampling points;

[0235] In the preset motion trajectory, the gas concentration decreases at at least two sampling points.

[0236] In this embodiment, the preset motion trajectory can be determined by the gas concentration inside the battery pack during the inflation process. In the preset motion trajectory, the gas concentration decreases at at least two sampling points. This allows the gas concentration at different scanning points to be as high as possible during detection, thereby improving the accuracy of airtightness detection.

[0237] In this embodiment, a preset motion trajectory can be determined based on the gas concentration distribution, prioritizing the scanning of areas with high gas concentration, so that the gas collection device can accurately detect the gas concentration and improve the accuracy of subsequent airtightness detection.

[0238] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0239] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined, including:

[0240] When the location of the first scan point is located at the first sampling point, the first scan point is any scan point on the sealing interface, and the first sampling point is any sampling point of at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the first sampling point.

[0241] When the first scan point is located between the second and third sampling points, and the second and third sampling points are any two adjacent sampling points among at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the second sampling point. At the same time, the gas concentration corresponding to the leakage critical curve of the second sampling point is less than the gas concentration corresponding to the leakage critical curve of the third sampling point.

[0242] In this embodiment, if the scanning point is located at a certain sampling point, then the leakage critical curve corresponding to that sampling point is used as the basis for leakage judgment, and a standard threshold is matched from the leakage critical curve based on the scanning time.

[0243] like Figure 5 As shown, the detection area can also be segmented based on at least two sampling points, such as ab, bc...hi. If the scanning point is located between two sampling points, for example, within the segment ab, the leakage critical curve with a lower gas concentration can be used as the basis for leakage judgment. The minimum concentration value of the corresponding time period of the leakage critical curve is selected to calculate the standard threshold for leakage judgment. Selecting this standard threshold as the final leakage judgment value can avoid missing the leak.

[0244] In this embodiment, the leakage critical curve at a lower concentration can be used as the basis for leakage judgment to determine the standard threshold, which can improve the situation of missed detection of leaks at the sealing interface and improve the accuracy of airtightness detection.

[0245] In some embodiments, the number of sampling points is one;

[0246] Based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve of at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined, including:

[0247] Based on the scanning time corresponding to each scanning point on the sealed interface of the gas sampling device, and the leakage critical curve of the sampling point, the standard threshold corresponding to each scanning point on the sealed interface at different scanning times is determined.

[0248] In this embodiment, since there is only one sampling point, the leakage critical curve of the sampling point can be directly used as the basis. Based on the scanning time corresponding to each scanning point, the standard threshold corresponding to each scanning point can be matched from the leakage critical curve of the sampling point.

[0249] In some examples, to further improve the accuracy of airtightness testing, a sampling point can be set up at a location in the battery pack where leaks are more likely to occur, based on practical experience. During airtightness testing, a gas sampling device can be used to scan the vicinity of this sampling point to obtain the gas concentration at each scan point in the vicinity. The gas concentration at each scan point can then be compared with the standard threshold corresponding to each scan point determined from the leakage critical curve of that sampling point to obtain the airtightness test result.

[0250] It is understood that the neighborhood of the sampling point can refer to the region where, at the same time, the gas concentration difference with that sampling point is less than or equal to a preset first concentration threshold. The first concentration threshold is set according to actual needs and is not specifically limited here.

[0251] In this embodiment, the leakage critical curve of a single sampling point can be directly used to match the standard threshold corresponding to each scanning point on the sealing interface based on the scanning time for airtightness testing. This eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness testing can begin from the non-equilibrium state, thus improving the efficiency of airtightness testing.

[0252] In some embodiments, a gas sampling device is used to scan the sealing interface to obtain the gas concentration at each scanning point on the sealing interface, including:

[0253] A gas sampling device is used to scan the sealed interface at a first speed to obtain the gas concentration at each scanning point on the sealed interface.

[0254] The first speed can be set according to actual needs, and no specific limit is set here.

[0255] In this embodiment, a fixed first speed can be used to scan the sealing interface, which improves the stability of the gas concentration at each scanning point and thus improves the accuracy of airtightness detection.

[0256] In some embodiments, the airtightness test result of each scanning point is determined based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point, including:

[0257] For each scan point, a first threshold and a second threshold are determined based on a standard threshold, wherein the values ​​of the first threshold, the standard threshold, and the second threshold increase sequentially.

[0258] Based on the gas concentration at each scanning point on the sealing interface, and the first and second thresholds corresponding to each scanning point, the airtightness test result of each scanning point is determined.

[0259] In this embodiment, the gas sampling device can scan the sealing interface at a relatively high initial speed, such as 40 mm / s, following a preset motion trajectory. Due to the high speed, the suction tube may not collect enough gas, resulting in a detected gas concentration that is lower than the actual gas concentration.

[0260] Based on this, a smaller first threshold and a larger second threshold can be determined according to the standard threshold. For example, 80% of the standard threshold can be used as the first threshold, and 120% of the standard threshold can be used as the second threshold. It is understood that the difference between the first threshold, the second threshold and the standard threshold can be within a preset difference range. This preset difference range can be set according to actual needs. For example, the preset difference range can be 10% to 20% of the standard threshold, and no specific limitation is made here.

[0261] The first and second thresholds can be used as the critical values ​​for leak detection. In other words, the gas concentration at each scanning point can be compared with the first and second thresholds to determine the airtightness detection result at each scanning point.

[0262] In this embodiment, the sealing interface can be scanned at a faster first speed, and a smaller first threshold and a larger second threshold can be determined according to a standard threshold. The first threshold and the second threshold are then used as the criteria for judging whether there is no leakage and whether there is leakage, respectively. This improves the efficiency of airtightness detection and the accuracy of the detection results.

[0263] In some embodiments, the airtightness detection result of each scanning point is determined based on the gas concentration at each scanning point on the sealing interface, and the first threshold and the second threshold corresponding to each scanning point, including:

[0264] If the gas concentration at the second scan point is less than or equal to the first threshold corresponding to the second scan point, it is determined that there is no gas leakage at the second scan point.

[0265] If the gas concentration at the second scan point is greater than or equal to the second threshold corresponding to the second scan point, it is determined that there is a gas leak at the second scan point.

[0266] The second scan point is any scan point on the sealed interface.

[0267] In this embodiment, if the gas concentration at a certain location is less than or equal to the first threshold corresponding to that location, then that location is considered leak-free, meaning the leakage rate is within the specified range and the airtightness test result is qualified. If the gas concentration at a certain location is greater than or equal to the second threshold corresponding to that location, then that location is considered leak-free, meaning the leakage rate exceeds the specified range and the airtightness test result is unqualified.

[0268] In this embodiment, a smaller first threshold is used as the criterion for judging no leakage, and a larger second threshold is used as the criterion for judging leakage. This improves both the efficiency and accuracy of the airtightness detection.

[0269] In some embodiments, determining the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface, and the first threshold and second threshold corresponding to each scanning point, further includes:

[0270] If the gas concentration at the second scanning point is greater than the first threshold and less than the second threshold, the gas concentration in the target area is obtained by scanning the target area at a second speed according to the preset moving starting point.

[0271] Wherein, the second scanning point is any scanning point on the sealing interface, the target area is the area adjacent to the second scanning point on the sealing interface, and the second speed is less than the first speed;

[0272] Based on the gas concentration in the target area and the standard threshold corresponding to the second scanning point, the airtightness detection result of the second scanning point is determined.

[0273] In this embodiment, if the gas concentration at any scanning point on the sealing interface, i.e. the second scanning point, is greater than the first threshold and less than the second threshold, a secondary judgment can be performed to improve the accuracy of the airtightness detection result.

[0274] Based on a preset starting point, the gas sampling device can scan the target area at a slower second speed, such as 20 mm / s. The target area can be the region adjacent to the second scanning point on the sealed interface. This means that the region adjacent to the second scanning point refers to the area where, at the same moment, the gas concentration difference between the second scanning point and the second sampling point is less than or equal to a preset second concentration threshold. The second concentration threshold is set according to actual needs and is not specifically limited here.

[0275] The preset starting point for movement can be a location where the gas concentration is greater than a first threshold and less than a second threshold, or other locations within a certain distance of that location. The target area can be the neighborhood of that location, i.e., the area where leaks may exist.

[0276] The gas concentration in the target area can be obtained by the gas sampling device at the second speed. Since the second speed is relatively slow, the suction tube can collect enough gas. In order to ensure detection accuracy, the standard threshold at this location can be used as the critical value for leakage judgment.

[0277] In other words, the gas concentration can be compared with a standard threshold to determine a more accurate airtightness test result for that location.

[0278] In this embodiment, a slower second speed is used to rescan areas where leaks may exist, thereby more accurately determining whether a gas leak has occurred in that area.

[0279] In some embodiments, the preset starting point of movement is located in the opposite direction of the second scanning point along the preset motion trajectory, and the distance between the preset starting point of movement and the second scanning point is a preset distance threshold.

[0280] In this embodiment, as Figure 8 As shown, based on the second scanning point 804 that may have a leak obtained by fast scanning detection, a preset distance threshold is set at its front end (i.e., in the opposite direction of the preset motion trajectory) as the preset starting point 803 for slow scanning.

[0281] Understandably, the preset distance threshold can be set by the fluctuation range of the deviation value between the response peak and the leak obtained by actual measurement. For example, the preset distance threshold can be 10cm.

[0282] In this embodiment, in areas where leaks may exist, scanning can begin at a slower second speed a certain distance ahead to avoid missing leaks and further improve the accuracy of airtightness detection.

[0283] In some embodiments, the gas collection device includes a first gas collection device and a second gas collection device, wherein the first gas collection device is used to scan the sealing interface at a first speed, and the second gas collection device is used to scan the target area at a second speed.

[0284] In this embodiment, as Figure 8 As shown, based on the rapid scanning detection of the sealing interface of the battery pack 100 by the first gas collection device 802, a second scanning point 804 that may have a leak is obtained. A position is set at its front end as the moving starting point 803 for slow scanning detection. According to the newly set moving starting point 803, another set of the same second gas collection device 801 can be used simultaneously to perform a second-level slow scanning leak detection on the area at this position to detect the precise location of the leak 805.

[0285] In this embodiment, different gas sampling devices can be used to perform fast and slow scans respectively, further improving the efficiency of airtightness detection.

[0286] In some embodiments, if the airtightness test result at the second scan point indicates a leak at the second scan point, the method further includes:

[0287] The location of the leak is determined based on the preset starting point of movement, the inner radius of the suction tube of the gas collection device, the length of the suction tube, the suction speed of the suction tube, the time corresponding to the response signal peak during the gas concentration detection process, and the second speed.

[0288] In this embodiment, if it is determined that there is a leak at the second scanning point, that is, if there is indeed a leak in the area of ​​the second scanning point, the location of the leak can be calculated more accurately.

[0289] For example, the location of the leak can be determined based on a preset starting point, the inner radius of the inhalation tube, the length of the inhalation tube, the inhalation speed of the inhalation tube, the time corresponding to the peak of the response signal during gas concentration detection, and the second velocity. Specifically, the distance between the leak and the preset starting point can be calculated based on the inner radius of the inhalation tube, the length of the inhalation tube, the inhalation speed of the inhalation tube, the time corresponding to the peak of the response signal during gas concentration detection, and the second velocity. The location of the leak can then be determined based on this distance and the position of the preset starting point.

[0290] The formula for calculating the distance x between the leak and the preset starting point is as follows:

[0291]

[0292] Where x is the distance between the leak and the preset starting point, and t 响应峰 Then, r is the time corresponding to the peak of the response signal measured by the sensor at the leak. p L is the inner radius of the inhalation tube. p v is the length of the inhalation tube. p v is the inhalation velocity of the inhalation tube. m The velocity of the suction tube, i.e., the second velocity, is a constant of 3.55. This value is for reference only. The specific value will be affected by factors such as the volume of the detection chamber connected to the gas collection device and the detection speed of the sensor. It needs to be tested and calibrated according to different gas collection devices.

[0293] In this embodiment, if a leak is determined to exist, the leak location can be calculated more precisely.

[0294] In some embodiments, before performing gas concentration simulation at at least one sampling point on the sealed interface of the battery pack to determine the leakage critical curve for each sampling point, the method further includes:

[0295] At least one sampling point is set on the sealed interface of the battery pack, and the location of the at least one sampling point is determined by the gas concentration distribution inside the battery pack during the battery pack inflation process.

[0296] In this embodiment, the location of at least one sampling point is determined by the gas concentration distribution inside the battery pack during the battery pack inflation process. For example, the spacing between the sampling points in this area can be determined based on the gas concentration distribution inside the battery pack.

[0297] In this embodiment, the location of at least one sampling point can be determined based on the gas distribution inside the battery pack, making the distribution of at least one sampling point more reasonable.

[0298] In some embodiments, when the gas concentration change in the first space inside the battery pack is less than the gas concentration change in the second space, the spacing between sampling points on the sealing interface corresponding to the first space is greater than the spacing between sampling points on the sealing interface corresponding to the second space.

[0299] In this embodiment, for spaces with large gas concentration variations, the spacing between sampling points on the corresponding sealing interface is smaller, while for spaces with small gas concentration variations, the spacing between sampling points on the corresponding sealing interface is larger. This ensures that the leakage critical curve, which is subsequently used as the basis for leakage judgment, is more accurate.

[0300] In this embodiment, the space with smaller gas concentration changes has a larger spacing between the corresponding sampling points, so that the distribution of at least one sampling point is more reasonable.

[0301] In some embodiments, obtaining the leakage critical curve at at least one sampling point on the sealing interface of the battery pack includes:

[0302] Gas concentration simulation was performed at at least one sampling point on the sealed interface of the battery pack to obtain the leakage critical curve at at least one sampling point.

[0303] In this embodiment, taking a mixture of 5% hydrogen and 95% nitrogen as the detection gas as an example, during the simulation process, the mixed gas can be injected into the gas inlet at a certain pressure according to the actual detection conditions, and a certain gas outlet pressure can be set at the outlet. The relevant fluid dynamics model is used for theoretical calculation. After a certain period of time, the simulation ends, and the hydrogen leakage concentration change curve of each sampling point with time is finally calculated, i.e., the leakage critical curve.

[0304] Gas concentration simulation can be performed at each sampling point of the battery pack using simulation software, and the gas concentration curve at that sampling point can be used as the leakage critical curve for that sampling point.

[0305] In this embodiment, the leakage critical curve of at least one sampling point in the battery pack can be obtained by gas concentration simulation, laying the foundation for airtightness detection.

[0306] To facilitate understanding of the airtightness detection method provided in the above embodiments, the following describes the airtightness detection method using a specific scenario embodiment. Figure 9 A flowchart illustrating a scenario embodiment of the above-described airtightness detection method is shown.

[0307] like Figure 9 As shown, this scenario embodiment may include the following steps:

[0308] Step 901: Segment the sealing interface of the battery pack and set sampling points. For example, the battery pack can be segmented according to the gas concentration distribution inside, and then at least one sampling point can be set on the sealing interface.

[0309] Step 902: Simulate the gas concentration at each sampling point of the battery pack using simulation software to determine the leakage critical curve for each sampling point.

[0310] Step 903: Set a preset motion trajectory based on the gas concentration distribution at different sampling points. The gas concentration distribution at different sampling points can be determined based on the leakage critical curve of each sampling point.

[0311] Step 904: Determine the standard threshold for each segment based on the preset motion trajectory and the leakage critical curve for each segment. Select a leakage critical curve with a lower concentration to match the standard threshold.

[0312] Step 905, for one of the schemes: perform gas replacement on the battery pack and start the trajectory method leak detection at the same time, and determine the air tightness test result according to the standard threshold of each segment.

[0313] Step 906: To further improve the efficiency of airtightness detection, another approach can be adopted: setting a first threshold and a second threshold for rapid scanning. The first and second thresholds can be determined based on a standard threshold, with the first threshold being less than the standard threshold and the second threshold being greater than the standard threshold.

[0314] Step 907: Perform a rapid scan to check for leaks in the battery pack.

[0315] Step 908: If the leakage rate is greater than the second threshold, the airtightness test result is as shown in step 909.

[0316] Step 909: Leakage rate exceeds standard.

[0317] Step 910: If the leakage rate is less than the first threshold, the airtightness test result is as shown in step 911.

[0318] Step 911: The leakage rate meets the standard.

[0319] If the first threshold is less than the leakage rate and the second threshold is less than the first threshold, then proceed to step 913.

[0320] Step 913: Identify the target area where a leak may occur.

[0321] Step 914: Perform a slow scan and re-evaluation of the target area.

[0322] Step 915: Based on the airtightness test results of each segment's standard threshold.

[0323] Based on the airtightness detection method provided in the above embodiments, this application also provides an embodiment of an airtightness detection device that uses the above-mentioned gas collection device for airtightness detection.

[0324] Figure 10 A schematic diagram of an airtightness detection device according to another embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown.

[0325] Reference Figure 10 The airtightness detection device 1000 may include:

[0326] The first acquisition module 1001 is used to acquire the leakage critical curve of at least one sampling point on the sealing interface of the battery pack. The leakage critical curve is used to characterize the gas concentration at the sampling point at different times.

[0327] The second acquisition module 1002 is used to scan the sealed interface with a gas collection device and acquire the gas concentration at each scanning point on the sealed interface.

[0328] The first determining module 1003 is used to determine the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device and the leakage critical curve of at least one sampling point.

[0329] The second determining module 1004 is used to determine the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point.

[0330] In this embodiment, the standard threshold corresponding to each scanning point on the sealing interface can be determined based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device, and the leakage critical curve obtained from at least one sampling point. This allows for airtightness detection based on the gas concentration collected at each scanning point and the corresponding standard threshold. It eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness detection can begin from the unequilibrium state, improving the efficiency of airtightness detection.

[0331] In some embodiments, the second acquisition module 1002 is further configured to:

[0332] A gas sampling device is used to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0333] In this embodiment, the sealing interface can be scanned according to a preset motion trajectory to perform airtightness detection on each scanning point on the sealing interface in a more standardized manner, reducing the risk of missed detection and improving the accuracy of airtightness detection.

[0334] In some embodiments, the second acquisition module 1002 is further configured to:

[0335] A gas collection device is used to scan the sealing interface at a first speed according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface.

[0336] The airtightness testing device 1000 also includes:

[0337] The third determining module is used to determine the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device and the leakage critical curve of at least one sampling point, and to determine the scanning time corresponding to each scanning point on the sealing interface based on the preset motion trajectory and the first velocity.

[0338] In this embodiment, the scanning time corresponding to each scanning point on the sealing interface can be calculated by using the preset motion trajectory and scanning speed of the gas collection device scanning on the sealing interface, thereby matching the standard threshold corresponding to each scanning point for subsequent airtightness testing.

[0339] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0340] The airtightness testing device 1000 also includes:

[0341] The fourth determining module is used to determine the preset motion trajectory based on the gas concentration distribution of at least two sampling points before scanning the sealed interface with the gas sampling device according to the preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

[0342] In the preset motion trajectory, the gas concentration decreases at at least two sampling points.

[0343] In this embodiment, a preset motion trajectory can be determined based on the gas concentration distribution, prioritizing the scanning of areas with high gas concentration, so that the gas collection device can accurately detect the gas concentration and improve the accuracy of subsequent airtightness detection.

[0344] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0345] The first determining module 1003 is also used for:

[0346] When the location of the first scan point is located at the first sampling point, the first scan point is any scan point on the sealing interface, and the first sampling point is any sampling point of at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the first sampling point.

[0347] When the first scan point is located between the second and third sampling points, and the second and third sampling points are any two adjacent sampling points among at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the second sampling point. At the same time, the gas concentration corresponding to the leakage critical curve of the second sampling point is less than the gas concentration corresponding to the leakage critical curve of the third sampling point.

[0348] In this embodiment, the leakage critical curve at a lower concentration can be used as the basis for leakage judgment to determine the standard threshold, which can improve the situation of missed detection of leaks at the sealing interface and improve the accuracy of airtightness detection.

[0349] In some embodiments, the number of sampling points is one;

[0350] The first determining module 1003 is also used for:

[0351] Based on the scanning time corresponding to each scanning point on the sealed interface of the gas sampling device, and the leakage critical curve of the sampling point, the standard threshold corresponding to each scanning point on the sealed interface at different scanning times is determined.

[0352] In this embodiment, the leakage critical curve of a single sampling point can be directly used to match the standard threshold corresponding to each scanning point on the sealing interface based on the scanning time for airtightness testing. This eliminates the need to wait until the battery pack reaches equilibrium before determining the standard threshold based on the gas concentration inside the battery pack; airtightness testing can begin from the non-equilibrium state, thus improving the efficiency of airtightness testing.

[0353] In some embodiments, the second acquisition module 1002 is further configured to:

[0354] A gas sampling device is used to scan the sealed interface at a first speed to obtain the gas concentration at each scanning point on the sealed interface.

[0355] In this embodiment, a fixed first speed can be used to scan the sealing interface, which improves the stability of the gas concentration at each scanning point and thus improves the accuracy of airtightness detection.

[0356] In some embodiments, the second determining module 1004 can also be used for:

[0357] For each scan point, a first threshold and a second threshold are determined based on a standard threshold, wherein the values ​​of the first threshold, the standard threshold, and the second threshold increase sequentially.

[0358] Based on the gas concentration at each scanning point on the sealing interface, and the first and second thresholds corresponding to each scanning point, the airtightness test result of each scanning point is determined.

[0359] In this embodiment, the sealing interface can be scanned at a faster first speed, and a smaller first threshold and a larger second threshold can be determined according to a standard threshold. The first threshold and the second threshold are then used as the criteria for judging whether there is no leakage and whether there is leakage, respectively. This improves the efficiency of airtightness detection and the accuracy of the detection results.

[0360] In some embodiments, the second determining module 1004 is further configured to:

[0361] If the gas concentration at the second scan point is less than or equal to the first threshold corresponding to the second scan point, it is determined that there is no gas leakage at the second scan point.

[0362] If the gas concentration at the second scan point is greater than or equal to the second threshold corresponding to the second scan point, it is determined that there is a gas leak at the second scan point.

[0363] The second scan point is any scan point on the sealed interface.

[0364] In this embodiment, a smaller first threshold is used as the criterion for judging no leakage, and a larger second threshold is used as the criterion for judging leakage. This improves both the efficiency and accuracy of the airtightness detection.

[0365] In some embodiments, the second determining module 1004 is further configured to:

[0366] When the gas concentration at the second scanning point is greater than the first threshold and less than the second threshold, the gas collection device scans the target area at a second speed according to the preset moving starting point to obtain the gas concentration of the target area; wherein, the second scanning point is any scanning point on the sealing interface, the target area is the area adjacent to the second scanning point on the sealing interface, and the second speed is less than the first speed;

[0367] Based on the gas concentration in the target area and the standard threshold corresponding to the second scanning point, the airtightness detection result of the second scanning point is determined.

[0368] In this embodiment, a slower second speed is used to rescan areas where leaks may exist, thereby more accurately determining whether a gas leak has occurred in that area.

[0369] In some embodiments, the preset starting point of movement is located in the opposite direction of the second scanning point along the preset motion trajectory, and the distance between the preset starting point of movement and the second scanning point is a preset distance threshold.

[0370] In this embodiment, in areas where leaks may exist, scanning can begin at a slower second speed a certain distance ahead to avoid missing leaks and further improve the accuracy of airtightness detection.

[0371] In some embodiments, the gas collection device includes a first gas collection device and a second gas collection device, wherein the first gas collection device is used to scan the sealing interface at a first speed, and the second gas collection device is used to scan the target area at a second speed.

[0372] In this embodiment, different gas sampling devices can be used to perform fast and slow scans respectively, further improving the efficiency of airtightness detection.

[0373] In some embodiments, the airtightness detection device 1000 further includes:

[0374] The fifth determining module is used to determine the location of the leak based on the preset starting point of movement, the inner radius of the suction tube of the gas collection device, the length of the suction tube, the suction speed of the suction tube, the time corresponding to the response signal peak during the gas concentration detection process, and the second speed.

[0375] In this embodiment, if a leak is determined to exist, the leak location can be calculated more precisely.

[0376] In some embodiments, the number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface;

[0377] The airtightness testing device 1000 also includes:

[0378] The setting module is used to set at least two sampling points on the sealed interface of the battery pack. The positions of the at least two sampling points are determined by the gas concentration distribution inside the battery pack during the battery pack inflation process.

[0379] In this embodiment, the positions of at least two sampling points can be determined based on the gas distribution inside the battery pack, making the distribution of at least two sampling points more reasonable.

[0380] In some embodiments, when the gas concentration change in the first space inside the battery pack is less than the gas concentration change in the second space, the spacing between sampling points on the sealing interface corresponding to the first space is greater than the spacing between sampling points on the sealing interface corresponding to the second space.

[0381] In this embodiment, the space with smaller gas concentration changes has a larger spacing between the corresponding sampling points, so that the distribution of at least one sampling point is more reasonable.

[0382] In some embodiments, the first acquisition module 1001 is further configured to:

[0383] Gas concentration simulation was performed at at least one sampling point on the sealed interface of the battery pack to obtain the leakage critical curve at at least one sampling point.

[0384] In this embodiment, the leakage critical curve of at least one sampling point in the battery pack can be obtained by gas concentration simulation, laying the foundation for airtightness detection.

[0385] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. They are devices corresponding to the above-mentioned airtightness detection method. All implementation methods in the above-mentioned method embodiments are applicable to the embodiments of this device. For details on its specific functions and the technical effects it brings, please refer to the method embodiments section. It will not be repeated here.

[0386] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0387] Figure 11 A schematic diagram of the hardware structure of an electronic device provided in yet another embodiment of this application is shown.

[0388] Electronic device 1100 may include processor 1101 and memory 1102 storing programs or instructions. When processor 1101 executes the program, it implements the steps in any of the above method embodiments.

[0389] For example, the program can be divided into one or more modules / units, one or more of which are stored in memory 1102 and executed by processor 1101 to complete this application. The one or more modules / units can be a series of program instruction segments capable of performing a specific function, which describe the execution process of the program in the device.

[0390] Specifically, the processor 1101 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0391] Memory 1102 may include mass storage for data or instructions. For example, and not limitingly, memory 1102 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 1102 may include removable or non-removable (or fixed) media. Where appropriate, memory 1102 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 1102 is non-volatile solid-state memory.

[0392] Memory may include read-only memory (ROM), random access memory (RAM), disk storage media devices, optical storage media devices, flash memory devices, and electrical, optical, or other physical / tangible memory storage devices. Therefore, typically, memory includes one or more tangible (non-transitory) readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the methods according to one aspect of this disclosure.

[0393] The processor 1101 implements any of the methods described above by reading and executing programs or instructions stored in the memory 1102.

[0394] In one example, the electronic device may also include a communication interface 1103 and a bus 1104. The processor 1101, memory 1102, and communication interface 1103 are connected via the bus 1104 and communicate with each other.

[0395] The communication interface 1103 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0396] Bus 1104 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 1104 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0397] Furthermore, in conjunction with the methods in the above embodiments, this application embodiment can provide a machine-readable storage medium for implementation. This machine-readable storage medium stores a program or instructions; when executed by a processor, the program or instructions implement any of the methods in the above embodiments. This machine-readable storage medium can be read by a machine such as a computer.

[0398] This application also provides a chip, which includes a processor and a communication interface. The communication interface and the processor are coupled. The processor is used to run programs or instructions to implement the various processes of the above method embodiments and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0399] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0400] This application provides a computer program product stored in a machine-readable storage medium. The program product is executed by at least one processor to implement the various processes of the above method embodiments and achieve the same technical effects. To avoid repetition, it will not be described again here.

[0401] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0402] The functional modules shown in the above block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on machine-readable media or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable media" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer grids such as the Internet, intranets, etc.

[0403] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0404] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by a computer program or instructions. These programs or instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0405] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for detecting airtightness, characterized in that, include: Obtain a leakage critical curve at at least one sampling point on the sealing interface of the battery pack, wherein the leakage critical curve is used to characterize the gas concentration at the sampling point at different times; A gas sampling device is used to scan the sealing interface to obtain the gas concentration at each scanning point on the sealing interface; Based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device, and the leakage critical curve of the at least one sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined. The airtightness test result of each scanning point is determined based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point.

2. The method according to claim 1, characterized in that, The step of using a gas sampling device to scan the sealed interface and obtain the gas concentration at each scanning point on the sealed interface includes: A gas sampling device is used to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface.

3. The method according to claim 2, characterized in that, The step of using a gas sampling device to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface includes: A gas collection device is used to scan the sealing interface at a first speed according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealing interface; The method further includes determining the standard threshold corresponding to each scanning point at different scanning times on the sealing interface based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device and the leakage critical curve of the at least one sampling point, and the method further includes: Based on the preset motion trajectory and the first speed, the scanning time corresponding to each scanning point on the sealing interface is determined.

4. The method according to claim 2 or 3, characterized in that, The number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface; Before using a gas sampling device to scan the sealed interface according to a preset motion trajectory to obtain the gas concentration at each scanning point on the sealed interface, the method further includes: The preset motion trajectory is determined based on the gas concentration distribution at the at least two sampling points; In the preset motion trajectory, the gas concentration at the at least two sampling points decreases.

5. The method according to any one of claims 1 to 4, characterized in that, The number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface; The step of determining the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device and the leakage critical curve of the at least one sampling point includes: When the location of the first scan point is located at the first sampling point, the first scan point is any scan point on the sealing interface, and the first sampling point is any sampling point of the at least two sampling points, the standard threshold corresponding to the first scan point is determined based on the scan time corresponding to the first scan point and the leakage critical curve of the first sampling point. When the first scanning point is located between the second and third sampling points, and the second and third sampling points are any two adjacent sampling points among the at least two sampling points, the standard threshold corresponding to the first scanning point is determined based on the scanning time corresponding to the first scanning point and the leakage critical curve of the second sampling point. At the same time, the gas concentration corresponding to the leakage critical curve of the second sampling point is less than the gas concentration corresponding to the leakage critical curve of the third sampling point.

6. The method according to any one of claims 1 to 3, characterized in that, The number of sampling points is one; The step of determining the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas sampling device and the leakage critical curve of the at least one sampling point includes: Based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device, and the leakage critical curve of the sampling point, the standard threshold corresponding to each scanning point on the sealing interface at different scanning times is determined.

7. The method according to claim 1, characterized in that, The step of using a gas sampling device to scan the sealed interface and obtain the gas concentration at each scanning point on the sealed interface includes: A gas sampling device is used to scan the sealed interface at a first speed to obtain the gas concentration at each scanning point on the sealed interface.

8. The method according to claim 7, characterized in that, The step of determining the airtightness test result of each scanning point based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point includes: For each scan point, a first threshold and a second threshold are determined according to the standard threshold, wherein the values ​​of the first threshold, the standard threshold, and the second threshold increase sequentially. Based on the gas concentration at each scanning point on the sealing interface, and the first threshold and the second threshold corresponding to each scanning point, the airtightness detection result of each scanning point is determined.

9. The method according to claim 8, characterized in that, The step of determining the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface, and the first threshold and the second threshold corresponding to each scanning point, includes: If the gas concentration at the second scan point is less than or equal to the first threshold corresponding to the second scan point, it is determined that there is no gas leakage at the second scan point. If the gas concentration at the second scan point is greater than or equal to the second threshold corresponding to the second scan point, it is determined that the second scan point is leaking. The second scanning point is any scanning point on the sealed interface.

10. The method according to claim 8 or 9, characterized in that, The step of determining the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface, and the first threshold and the second threshold corresponding to each scanning point, further includes: When the gas concentration at the second scanning point is greater than the first threshold and less than the second threshold, the gas collection device is used to scan the target area at a second speed according to the preset moving starting point to obtain the gas concentration of the target area; wherein, the second scanning point is any scanning point on the sealing interface, the target area is the area adjacent to the second scanning point on the sealing interface, and the second speed is less than the first speed; The air tightness detection result of the second scanning point is determined based on the gas concentration in the target area and the standard threshold corresponding to the second scanning point.

11. The method according to claim 10, characterized in that, The preset starting point of movement is located in the opposite direction of the second scanning point along the preset movement trajectory, and the distance between the preset starting point of movement and the second scanning point is a preset distance threshold.

12. The method according to claim 10 or 11, characterized in that, The gas collection device includes a first gas collection device and a second gas collection device, wherein the first gas collection device is used to scan the sealing interface at the first speed, and the second gas collection device is used to scan the target area at the second speed.

13. The method according to any one of claims 10 to 12, characterized in that, If the airtightness test result at the second scanning point indicates a leak at the second scanning point, the method further includes: The location of the leak is determined based on the preset starting point, the inner radius of the suction tube of the gas collection device, the length of the suction tube, the suction speed of the suction tube, the time corresponding to the response signal peak during the gas concentration detection process, and the second speed.

14. The method according to any one of claims 1 to 13, characterized in that, The number of sampling points is at least two, and the at least two sampling points are distributed at intervals on the sealed interface; Before obtaining the leakage critical curve at at least one sampling point on the sealed interface of the battery pack, the method further includes: At least two sampling points are set on the sealed interface of the battery pack, and the positions of the at least two sampling points are determined by the gas concentration distribution inside the battery pack during the inflation process.

15. The method according to claim 14, characterized in that, When the gas concentration change in the first space inside the battery pack is less than the gas concentration change in the second space, the spacing between sampling points on the sealing interface corresponding to the first space is greater than the spacing between sampling points on the sealing interface corresponding to the second space.

16. The method according to any one of claims 1 to 15, characterized in that, The process of obtaining the leakage critical curve at at least one sampling point on the sealed interface of the battery pack includes: Gas concentration simulation was performed at at least one sampling point on the sealed interface of the battery pack to obtain the leakage critical curve of the at least one sampling point.

17. An airtightness detection device, characterized in that, include: The first acquisition module is used to acquire the leakage critical curve of at least one sampling point on the sealing interface of the battery pack, wherein the leakage critical curve is used to characterize the gas concentration at the sampling point at different times. The second acquisition module is used to scan the sealing interface with a gas collection device to acquire the gas concentration at each scanning point on the sealing interface. The first determining module is used to determine the standard threshold corresponding to each scanning point on the sealing interface at different scanning times based on the scanning time corresponding to each scanning point on the sealing interface of the gas collection device and the leakage critical curve of the at least two sampling points. The second determining module is used to determine the airtightness detection result of each scanning point based on the gas concentration at each scanning point on the sealing interface and the standard threshold corresponding to each scanning point.

18. A gas collection device, characterized in that, include: Inhalation tube; A gas gathering assembly has at least one first surface flush with the sealing interface of the battery pack, and a through hole is provided on the gas gathering assembly, the through hole penetrating the first surface, and one end of the air intake pipe is disposed in the through hole.

19. The apparatus according to claim 18, characterized in that, The gas gathering component is a baffle, and the through hole is formed on the baffle.

20. The apparatus according to claim 18, characterized in that, The gas focusing assembly includes: A first baffle portion and a second baffle portion, wherein the first baffle portion and the second baffle portion are connected and form an included angle; The through hole is formed in the first baffle portion or the second baffle portion.

21. The apparatus according to claim 20, characterized in that, The through hole is formed at the connection between the first baffle portion and the second baffle portion.

22. The apparatus according to claim 20 or 21, characterized in that, The first baffle portion and the second baffle portion are movably connected; The device further includes a stretching component, which is connected to at least one of the first baffle portion and the second baffle portion to switch the first state and the second state of the gas gathering component; In the first state, the first baffle portion and the second baffle portion form an angle; in the second state, the first baffle portion and the second baffle portion are on the same plane.

23. The apparatus according to any one of claims 18 to 22, characterized in that, The device further includes: The detection chamber is connected to the end of the suction tube furthest from the gas gathering assembly; A sensor, located within the detection chamber, is used to detect the gas concentration collected by the suction tube.

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