Method, device and system for detecting air tightness of battery pack

Abstract

The invention relates to a battery pack airtightness detection method, device and system, a storage medium and a computer program product. The battery pack is arranged on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected with the second interface through an air passage, and the method comprises the following steps: acquiring pressure data of the second interface in a preset time period; and based on the pressure data, determining an air tightness detection result of the battery pack. By adopting the method, the air tightness detection of the battery pack at the whole vehicle end can be realized without unpacking, and the detection efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and in particular to a method, device, system, storage medium and computer program product for detecting air tightness of a battery pack. Background Art

[0002] As the core component of new energy vehicles, the battery pack directly affects the safety of the entire vehicle. Therefore, the performance of the battery pack is of great significance to the development and use of new energy vehicles. Among them, the protection level standard IP67 of the battery pack is one of the important performances of the battery pack, and the air tightness of the battery pack is an important representation method of IP67. Therefore, in the process of testing and repairing new energy vehicles, it is usually necessary to test the air tightness of the battery pack.

[0003] In traditional technology, the battery pack needs to be removed from the vehicle and tested using airtight tooling. However, this method is cumbersome to operate, has high requirements for site, equipment, and personnel, is difficult to implement, and is time-consuming and inefficient. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, system, storage medium and computer program product for airtightness detection of battery packs that does not require unpacking and simplifies operation in order to address the above technical problems.

[0005] In a first aspect, an embodiment of the present disclosure provides a method for detecting the air tightness of a battery pack. The battery pack is disposed on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface via an airway, and the method comprises:

[0006] Acquiring pressure data of the second interface in a preset time period;

[0007] Based on the pressure data, an airtightness test result of the battery pack is determined.

[0008] In one embodiment, obtaining the pressure data of the second interface in a preset time period includes:

[0009] In response to the air tightness detection signal, connecting the pressure regulating device to the second interface and switching the pressure regulating device to a working state;

[0010] When the pressure value of the battery pack is within a preset pressure value range, switching the pressure regulating device to a non-working state, and acquiring pressure data of the second interface in a preset time period;

[0011] The step of determining the air tightness test result of the battery pack based on the pressure data includes:

[0012] Based on the correlation between the change in the pressure data and the airtightness test result of the battery pack, the airtightness test result corresponding to the pressure data is determined.

[0013] In one of the embodiments, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0014] In one embodiment, the first interface is connected to a third interface on the vehicle through the airway, and the second detection interface of the detection connection device is connected to the third interface, and the method further includes:

[0015] In response to the airtightness detection signal, disconnecting the second detection interface from the third interface; and / or,

[0016] In response to the airtightness detection end signal, the second detection interface is connected to the third interface.

[0017] In one of the embodiments, the detection connection device is arranged in a charging device of the vehicle.

[0018] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0019] In a second aspect, an embodiment of the present disclosure further provides an air tightness detection device for a battery pack, wherein the battery pack is disposed on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface through an airway, and the device comprises:

[0020] An acquisition module, used for acquiring pressure data of the second interface in a preset time period;

[0021] A determination module is used to determine the air tightness test result of the battery pack based on the pressure data.

[0022] In one embodiment, the acquisition module includes:

[0023] a first connection submodule, used for connecting the pressure regulating device to the second interface in response to an airtightness detection signal, and switching the pressure regulating device to a working state;

[0024] an acquisition submodule, configured to switch the pressure regulating device to a non-working state and acquire pressure data of the second interface in a preset time period when the pressure value of the battery pack is within a preset pressure value range;

[0025] The determining module comprises:

[0026] The determination submodule is used to determine the airtightness test result corresponding to the pressure data based on the correlation between the change amount of the pressure data and the airtightness test result of the battery pack.

[0027] In one of the embodiments, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0028] In one embodiment, the first interface is connected to a third interface on the vehicle through the airway, the second detection interface of the detection connection device is connected to the third interface, and the device further comprises:

[0029] a cut-off submodule, used to cut off the second detection interface from the third interface in response to an airtightness detection signal; and / or,

[0030] The second connection submodule is used to connect the second detection interface with the third interface in response to the airtightness detection end signal.

[0031] In one of the embodiments, the detection connection device is arranged in a charging device of the vehicle.

[0032] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0033] In a third aspect, an embodiment of the present disclosure further provides an airtightness detection system for a battery pack, the system comprising:

[0034] A battery pack disposed in a body of a vehicle, the battery pack being provided with a first interface, the first interface being connected to a second interface on the vehicle through an air passage;

[0035] A processor is used to obtain pressure data of the second interface in a preset time period, and determine the air tightness test result of the battery pack based on the pressure data.

[0036] In one embodiment, obtaining the pressure data of the second interface in a preset time period includes:

[0037] In response to the air tightness detection signal, connecting the pressure regulating device to the second interface and switching the pressure regulating device to a working state;

[0038] When the pressure value of the battery pack is within a preset pressure value range, switching the pressure regulating device to a non-working state, and acquiring pressure data of the second interface in a preset time period;

[0039] The step of determining the air tightness test result of the battery pack based on the pressure data includes:

[0040] Based on the correlation between the change in the pressure data and the airtightness test result of the battery pack, the airtightness test result corresponding to the pressure data is determined.

[0041] In one of the embodiments, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0042] In one embodiment, the first interface is connected to a third interface on the vehicle through the airway, and the second detection interface of the detection connection device is connected to the third interface, and the method further includes:

[0043] In response to the airtightness detection signal, disconnecting the second detection interface from the third interface; and / or,

[0044] In response to the airtightness detection end signal, the second detection interface is connected to the third interface.

[0045] In one of the embodiments, the detection connection device is arranged in a charging device of the vehicle.

[0046] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0047] In a fourth aspect, the embodiments of the present disclosure further provide a computer-readable storage medium, wherein a computer program is stored thereon, and when the computer program is executed by a processor, the steps of any one of the methods in the embodiments of the present disclosure are implemented.

[0048] In a fifth aspect, the embodiments of the present disclosure further provide a computer program product, wherein the computer program product includes a computer program, and when the computer program is executed by a processor, the steps of any one of the methods in the embodiments of the present disclosure are implemented.

[0049] The disclosed embodiment provides a method for detecting the air tightness of a battery pack on a vehicle. The air tightness detection result of the battery pack is determined by the pressure data of the second interface in a preset time period. The air tightness detection of the battery pack on the whole vehicle can be realized without disassembling the battery pack. The operation is simple and no complicated testing tooling is required. The implementation difficulty is low. During the inspection and maintenance of the vehicle, the air tightness of the battery pack can be detected quickly and conveniently, which improves efficiency and is suitable for a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic flow chart of a method for detecting air tightness of a battery pack in one embodiment;

[0051] Figure 2 A schematic diagram of a flow chart of a method for detecting air tightness of a battery pack in one embodiment

[0052] Figure 3 is a schematic flow chart of a method for detecting air tightness of a battery pack in one embodiment;

[0053] Figure 4 is a schematic diagram of an AC charging connector in one embodiment;

[0054] Figure 5 is a schematic diagram of an air tightness detection system for a battery pack in one embodiment;

[0055] Figure 6 1 is a structural block diagram of an airtightness detection device for a battery pack in one embodiment. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present disclosure and are not used to limit the embodiments of the present disclosure.

[0057] In one embodiment, Figure 1 As shown, a method for detecting air tightness of a battery pack is provided, wherein the battery pack is arranged on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface through an airway, and the method comprises:

[0058] Step S110, obtaining pressure data of the second interface in a preset time period;

[0059] Step S120: determining the air tightness test result of the battery pack based on the pressure data.

[0060] Specifically, the battery pack is disposed on the vehicle, and a first interface is disposed on the battery pack. In some possible implementations, the first interface may be an existing interface on the battery pack, for example, the first interface may share an interface with a high-voltage wiring harness; the first interface may also be a separately added air circuit interface, for example, an interface may be added to the electric quick-change end or the water quick-change end of the battery as the first interface. The first interface is connected to the second interface through an airway. In one example, the second interface may be a newly added air circuit interface; in another example, the second interface may be an existing interface in the vehicle, for example, an interface on a charging connector.

[0061] In the disclosed embodiment, when performing air tightness testing of the battery pack, the pressure data of the second interface in a preset time period is obtained. In one example, the second interface is connected to the first interface on the battery pack through an airway, and the pressure data of the second interface can directly or indirectly reflect the pressure data of the battery pack. For example, if the pressure between the second interface and the battery pack is always the same, the pressure data of the second interface can be directly used as the pressure data of the battery pack. Similarly, the pressure data of the second interface at this time can also be directly obtained by the pressure detection device in the battery pack; if there is a pressure difference between the second interface and the battery pack, the pressure data of the battery pack can be determined by processing the pressure data of the second interface according to the change law of the pressure difference between the battery pack and the second interface. Similarly, the pressure data of the second interface at this time can also be obtained by analyzing and processing the pressure data of the battery pack. In one example, the pressure data of the second interface includes the pressure data of the battery pack. The preset time period can be determined according to the actual air tightness testing scenario. For example, it can be determined according to factors such as pressure changes, pressure difference between the second interface and the outside world, etc. In one example, when the difference between the pressure value of the second interface and the external pressure value is within a preset range, it can be determined as the starting point of a preset time period, and the pressure data of the second interface of the preset time period can be obtained; in another example, the pressure of the battery pack can be adjusted by a pressure regulating device, and when the pressure condition meets the preset requirements, it can be determined as the starting point of the preset time period, and the pressure data of the second interface of the preset time period can be obtained. Among them, the preset range and the preset requirements can be determined according to the actual application scenario. Furthermore, when there is a certain pressure difference between the second interface pressure and the external pressure, a more accurate air tightness test result of the battery pack can be obtained. In one example, the pressure data of the second interface can also be continuously obtained, and the air tightness of the battery pack can be analyzed according to the change law of the pressure data to obtain the air tightness test result of the battery pack.

[0062] According to the pressure data of the second interface in the preset time period obtained, the air tightness test result of the battery pack can be determined. Since the second interface is connected to the first interface through the airway, the pressure data of the second interface can reflect the pressure data of the battery pack. In one example, the pressure data of the second interface in the preset time period includes the change of the pressure value in the preset time period, and the air tightness of the battery pack can be analyzed and determined based on the change of the pressure value, and the corresponding air tightness test result is obtained. Among them, the correlation between the pressure data and the air tightness test result of the battery pack can be determined in advance according to the actual application scenario. In some possible implementations, the air tightness test result can be divided into pass detection and fail detection. For example, when the absolute value of the change amount of the pressure data in the preset time period is less than or equal to the preset threshold, the corresponding air tightness test result is pass detection, and when the absolute value of the change amount of the pressure data in the preset time period is greater than the preset threshold, the corresponding air tightness test result is not passed detection; the air tightness test result can be further refined, and different pressure data correspond to different air tightness levels. For example, according to the absolute value of the change amount of the pressure data from small to large, the corresponding air tightness test result level is from good to bad, and the specific corresponding relationship can be determined according to the actual application scenario.

[0063] The disclosed embodiment provides a method for detecting the air tightness of a battery pack on a vehicle. The air tightness detection result of the battery pack is determined by the pressure data of the second interface in a preset time period. The air tightness detection of the battery pack on the whole vehicle can be realized without disassembling the battery pack. The operation is simple and no complicated testing tooling is required. The implementation difficulty is low. During the inspection and maintenance of the vehicle, the air tightness of the battery pack can be detected quickly and conveniently, which improves efficiency and is suitable for a variety of application scenarios.

[0064] In one embodiment, Figure 2 As shown, the step of obtaining the pressure data of the second interface in a preset time period includes:

[0065] Step S111, in response to the air tightness detection signal, connecting the pressure regulating device to the second interface and switching the pressure regulating device to a working state;

[0066] Step S112, when the pressure value of the battery pack is within a preset pressure value range, switching the pressure regulating device to a non-working state, and acquiring pressure data of the second interface in a preset time period;

[0067] The step of determining the air tightness test result of the battery pack based on the pressure data includes:

[0068] Step S121, based on the correlation between the change in the pressure data and the airtightness test result of the battery pack, determine the airtightness test result corresponding to the pressure data.

[0069] In the embodiment of the present disclosure, in response to the airtightness detection signal, the pressure regulating device is connected to the second interface, wherein the airtightness detection signal can be actively triggered, for example, the airtightness detection of the battery pack is started by the vehicle control device, etc.; it can also be passively triggered, for example, the vehicle battery pack sends a warning signal to start the airtightness detection, etc. The pressure regulating device includes a device capable of changing the pressure in the battery pack, such as a high-pressure gas source, a vacuum pump, etc. The pressure regulating device can be directly connected to the second interface or indirectly connected through other devices. After the pressure regulating device is connected to the second interface and switched to the working state, the pressure in the battery pack is changed through the airway and the first interface. After the pressure regulating device is connected to the second interface, when the pressure value of the battery pack is within the preset pressure value range, the pressure regulating device is switched to the non-working state, wherein the preset pressure value range can be determined in advance according to the actual application scenario and the pressure regulating device, different battery packs and application scenarios correspond to different preset pressure value ranges, and different pressure regulating devices under the same battery pack and application scenario will also correspond to different preset pressure value ranges. In one example, the pressure value of the battery pack can be obtained by a pressure sensor set in the battery pack. In order to achieve the purpose of air tightness detection, the preset pressure value range is usually set to have a certain difference from the pressure value of the battery pack under normal use. In one example, after the pressure regulating device is switched to a non-working state, the second interface is in a closed state and is not connected to the outside world to ensure that the battery pack does not leak through the first interface during the air tightness detection process. The pressure data of the second interface in a preset time period is obtained, wherein the duration of the preset time period can be determined in advance according to the actual application scenario. The preset time period can be a period determined from the moment the pressure regulating device is switched to a non-working state to the moment the pressure value in the battery pack returns to the pressure value under normal working conditions.

[0070] After obtaining the pressure data of the preset time period, the airtightness test result corresponding to the obtained pressure data is determined according to the correlation between the change amount of the pressure data and the airtightness test result of the battery pack. Among them, the correlation between the change amount of the pressure data and the airtightness test result of the battery pack can be determined in advance according to the actual application scenario. In some possible implementations, the airtightness test results can be divided into pass detection and fail detection. For example, when the absolute value of the change amount of the pressure data in the preset time period is less than or equal to the preset threshold, the corresponding airtightness test result is pass detection, and when the absolute value of the change amount of the pressure data in the preset time period is greater than the preset threshold, the corresponding airtightness test result is fail detection; the airtightness test result can be further refined, and different changes in pressure data correspond to different airtightness levels. For example, according to the absolute value of the change amount from small to large, the corresponding airtightness test result level is from good to bad, and the specific correspondence can be determined according to the actual application scenario.

[0071] In the embodiment of the present disclosure, when an airtightness detection signal is received and an airtightness detection is required, the pressure regulating device and the second interface are connected, and the pressure regulating device is switched to a working state. When the pressure value of the battery pack is within a preset pressure value range, the pressure regulating device is switched to a non-working state, and the pressure data of the battery pack in a preset time period is obtained. The corresponding airtightness detection result is determined according to the change in the pressure data, thereby realizing the airtightness detection of the battery pack on the whole vehicle side. In the present embodiment, by connecting the pressure regulating device and the second interface, the battery pack arranged in the vehicle body can be directly tested for airtightness without disassembling the battery pack. The operation is simple, no complicated testing tooling is required, and the difficulty of implementation is low. During the inspection and maintenance of the vehicle, the airtightness of the battery pack can be tested quickly and conveniently, thereby improving efficiency. By using the pressure regulating device to change the pressure of the battery pack and determine the airtightness detection result of the battery pack, the pressure can be accurately controlled, and the airtightness detection efficiency is ensured while effectively improving the accuracy of the airtightness detection result, which is suitable for more application scenarios.

[0072] In one embodiment, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0073] In the embodiment of the present disclosure, the pressure regulating device is connected to the second interface through a detection connection device, wherein a detection interface is provided on the detection connection device, and the pressure regulating device is connected to the second interface through a first detection interface on the detection connection device. Normally, the first detection interface of the detection connection device matches the second interface. In one example, the detection connection device can be connected to pressure regulating devices of different models and types. In another example, the detection interface of the detection connection device can be set to a connected or closed state according to the actual application scenario. For example, when the pressure regulating device is in a working state and connected to the second interface, the first detection interface is set to a connected state. When the pressure regulating device is switched to a non-working state and the pressure of the battery pack needs to be monitored, the first detection interface can be set to a closed state so that the second interface is not connected to the outside world. Considering that the pressure regulating device needs to be connected to the second interface on the vehicle, the interfaces of different pressure regulating devices may be different. In order to ensure that the pressure regulating device can be connected to the second interface on the vehicle and perform precise pressure control, in this embodiment, a detection connection device is provided. The first detection interface on the detection connection device matches the second detection interface on the vehicle and can be directly connected to the second interface. At the same time, the detection connection device can also be connected to the pressure regulating device. In one example, the detection connection device can be adjusted according to the interface parameters of different models and types of pressure regulating devices, so that the detection connection device can be connected to a variety of pressure regulating devices. In one possible implementation, the detection connection device can be a separate structure set according to the interface shape parameters, size parameters, etc. of the second interface, which is used to connect the second interface and the pressure regulating device when the battery pack is tested for air tightness. In another possible implementation, the second interface can be obtained based on the structure of the vehicle itself. In one example, the second interface can be a backup interface for the vehicle's AC charging connector. When the vehicle is charged, there is a corresponding charging device, and the charging device matches the vehicle's AC charging connector. At this time, the detection connection device can be set in the charging device. For example, in the charging device, a first detection interface matching the second interface can be set according to the interface position relationship, and the first detection interface can be connected to the pressure regulating device. At this time, the charging device is a charging airtightness detection composite device, which takes into account the functions of charging and airtightness detection.

[0074] In the disclosed embodiment, the second interface can also be controlled to be connected or disconnected with the outside world by the detection connection device, so as to realize exhaust / inhalation after the air tightness test is completed. At the beginning of the air tightness test, the second interface and the outside world are cut off to ensure that the battery pack is not connected to the outside world; at the end of the air tightness test, the second interface and the outside world are connected to exhaust / inhalation to ensure that the voltage in the battery pack returns to normal. In a possible implementation, it can be realized by adding a second detection interface to the detection connection device, a third interface is set on the vehicle, the third interface and the first interface are connected through an airway, and the second detection interface is connected to the third interface. In response to the air tightness detection signal, the second detection interface is disconnected from the third interface; and / or, in response to the air tightness detection end signal, the second detection interface is connected to the third interface. In another possible implementation, it can also be realized directly through the second interface, in response to the air tightness detection signal, the second interface and the outside world are disconnected by the detection connection device, and / or, in response to the air tightness detection end signal, the second interface and the outside world are connected by the detection connection device. In one example, it can be realized by setting a vent to the outside world on the detection connection device.

[0075] In the embodiment of the present disclosure, the pressure regulating device is connected to the second interface through the detection connecting device, so that different types of pressure regulating devices can be connected to the second interface, which is suitable for more application scenarios and simplifies the operation of air tightness detection; it can ensure the connection adaptability between the detection interface and the second interface and realize precise control of the interface status.

[0076] In one embodiment, Figure 3 As shown, the first interface is connected to the third interface on the vehicle through the airway, and the second detection interface of the detection connection device is connected to the third interface, and the method further includes:

[0077] Step S1111, in response to the airtightness detection signal, disconnecting the second detection interface from the third interface; and / or,

[0078] Step S130: in response to the airtightness detection end signal, connecting the second detection interface with the third interface.

[0079] In the embodiment of the present disclosure, the first interface is connected to the third interface through the airway, and the third interface is connected to the second detection interface of the detection connection device. Generally, the second detection interface of the detection connection device matches the third interface. In one example, the second detection interface can be set to a connected or closed state according to the actual application scenario. Specifically, in response to the airtightness detection signal, the airtightness of the battery pack needs to be detected, the second detection interface is cut off from the third interface, and the third interface is not connected to the outside world. In one example, it can be achieved by switching the second detection interface to a closed state. In response to the airtightness detection end signal, at this time, the airtightness detection ends, and the battery pack needs to be vented so that the pressure in the battery pack returns to the pressure value under normal working conditions, and the second detection interface is connected to the third interface. In one example, it can be achieved by switching the second detection interface to a connected state. Among them, the airtightness detection end signal can be passively triggered, using the user to send an end signal through the vehicle control device; it can also be actively triggered, for example, after obtaining the airtightness detection result of the battery pack, an end signal is automatically sent, and the present disclosure does not limit this. In this embodiment, the third interface is an exhaust / intake interface, which is used to restore the pressure value of the battery pack to the pressure value in a normal state after the air tightness test is completed.

[0080] The disclosed embodiment is also provided with a third interface, which can control the connection or closing of the third interface by detecting the second detection interface of the connecting device, so that it can be switched in different detection stages in different application scenarios to achieve the adjustment of the air pressure in the battery pack, further simplifying the operation and being suitable for more application scenarios.

[0081] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0082] In the disclosed embodiment, the vehicle is provided with an AC charging connector for AC charging the battery in the vehicle. The AC charging connector is provided with a plurality of interfaces. Usually, a spare interface is provided among the plurality of interfaces, and there is no electrical connection between the spare interface and the battery. In the present embodiment, the spare interface is used as the second interface and is connected to the first interface through an airway. When performing an air tightness test on the battery pack, the pressure in the battery pack is changed by connecting the second interface on the AC charging connector on the vehicle to a pressure regulating device. In one example, a plurality of spare interfaces are provided on the AC charging connector. In addition to the second interface, a spare interface can also be selected as the third interface. Figure 4 is a schematic diagram of an AC charging connector according to an exemplary embodiment, referring to Figure 4 As shown, Figure 4This is a schematic diagram of the national standard slow charging connector, that is, the national standard AC charging connector. CC is the high-voltage interlocking interface, CP is the communication interface, L is the AC power live wire interface, N is the AC neutral wire interface, PE is the ground wire interface, NC1 and NC2 are spare interfaces, that is, blind holes. NC1 (or NC2) can be set as the second interface, and NC2 (or NC1) can be set as the third interface.

[0083] In the disclosed embodiment, the spare interface of the vehicle's AC charging connector is used as the second interface. It is only necessary to add an air passage between the spare interface and the battery pack in a traditional vehicle to realize the air tightness detection of the battery pack. There is no need to add a new interface. During the detection, there is no need to remove the battery pack, and it can be achieved directly through the charging connector. Through this embodiment, the implementation method is simple, can be applicable to different application scenarios, and the implementation cost is low.

[0084] In one embodiment, the detection connection device is arranged in a charging device of the vehicle.

[0085] In the disclosed embodiment, the detection connection device can be arranged in the charging device of the vehicle, and the charging device of the vehicle can establish an electrical connection with the battery through the interface of the charging connector to realize the replenishment of the battery power. In this embodiment, the detection connection device can be added to the charging device, and the detection interface can be connected to the second interface of the airtightness detection. In one example, a detection interface and an air pipeline that can be connected to the pressure regulating device can be added to the charging device of the vehicle. In a possible implementation, when the spare interface of the AC charging connector is set as the second interface, a first detection interface matching the second interface can be added to the connector of the AC charging device. Furthermore, the spare interface of the AC charging connector also includes a spare interface set as the third interface, and a second detection interface matching the third interface can be added to the connector of the AC charging device, wherein the first detection interface is provided with an air pipeline that can be connected to the pressure regulating device. In one example, the vehicle is charged by a charging gun, and the detection connection device can be set in the charging gun to obtain a charging and airtightness detection composite gun, and the battery can be charged or airtightness detected by using the charging and airtightness detection composite gun.

[0086] In the disclosed embodiment, the detection connection device is arranged in the charging equipment of the vehicle, which is combined with the structure of the charging equipment, and the implementation method is simple, which further simplifies the operation of the air-tightness detection. The charging equipment is a supporting equipment of the vehicle, which is suitable for a variety of application scenarios, has strong operability, can quickly and efficiently realize the air-tightness detection of the battery pack, and has low operating requirements.

[0087] In one embodiment, the pressure regulating device includes at least one of a vacuum pump and a high-pressure gas source.

[0088] In the disclosed embodiment, the pressure regulating device includes at least one of a vacuum pump and a high-pressure gas source, wherein when the vacuum pump is in operation, the battery pack can be evacuated through the second interface so that the pressure value in the battery pack is reduced to within a preset pressure value range; when the high-pressure gas source is in operation, the battery pack can be inflated through the second interface so that the pressure value in the battery pack is increased to within a preset pressure value range. When the pressure in the battery pack is regulated by the vacuum pump, the preset pressure value range is less than the pressure of the battery pack in a normal working state, and when the vacuum pump is switched to a non-operating state, the pressure value of the battery pack will increase; when the pressure in the battery pack is regulated by the high-pressure gas source, the preset pressure value range is greater than the pressure of the battery pack in a normal working state, and when the high-pressure gas source is switched to a non-operating state, the pressure value of the battery pack will decrease.

[0089] The disclosed embodiment can adjust the pressure in the battery pack by a vacuum pump or a high-pressure gas source, so as to realize the air tightness detection of the battery pack under different pressure adjustment requirements in different application scenarios. It is suitable for more application scenarios, has low implementation difficulty and simple operation.

[0090] Figure 5 FIG. 1 is a schematic diagram of a battery pack airtightness detection system according to an exemplary embodiment. Figure 5 As shown, a second interface is provided on the charging connector and connected to the first interface on the battery pack through an air duct. When performing an airtightness test, the second interface is connected to the charging connector through a high-pressure gas source and / or a vacuum pump, wherein the high-pressure gas source and / or the vacuum pump can be connected to the charging connector through a detection connection device. In one example, the air duct can share an interface with the high and low voltage harnesses, and the interface of the high and low voltage harnesses on the battery pack is set as the first interface. In another example, the detection connection device can be provided in a charging device to obtain a charging and airtightness detection composite device, which can be connected to an AC power source to charge the battery pack, and can also be connected to a high-pressure gas source and / or a vacuum pump to detect the airtightness of the battery pack.

[0091] In one example, when the pressure regulating device is set to a high-pressure gas source, the high-pressure gas source is connected to the second interface on the vehicle through the first detection interface on the detection connection device, and the second detection interface on the detection connection device is connected to the third interface on the vehicle. When the air tightness test starts, the second detection interface on the detection connection device is closed, and the high-pressure gas source is used to inflate the battery pack pressure value to within the preset pressure value range, and then the high-pressure gas source is closed. The pressure data of the second interface in the preset time period is obtained, and the air tightness test result of the battery pack is determined according to the change in the pressure data. In one example, the preset pressure value range can be set to 4.2bar±0.01bar, and the preset time period can be set to 2 minutes after the high-pressure gas source is turned off. When the pressure value corresponding to the preset time period drops by less than 0.2bar, the corresponding air tightness test result is determined to be passed, and the battery pack meets the air tightness requirements. After the air tightness test is completed, the second detection interface on the detection connection device is opened, the high-pressure gas is discharged, and the air tightness test is completed.

[0092] In one example, when the pressure regulating device is set to a vacuum pump, the vacuum pump is connected to the second interface on the vehicle through the first detection interface on the detection connection device, and the second detection interface on the detection connection device is connected to the third interface on the vehicle. When the air tightness test starts, the second detection interface on the detection connection device is closed, and the vacuum pump is used to evacuate the battery pack pressure value to within the preset pressure value range, and then the vacuum pump is turned off. The pressure data of the second interface in the preset time period is obtained, and the air tightness test result of the battery pack is determined according to the change in the pressure data. In one example, the preset pressure value range can be set to -0.3ar±0.01bar, and the preset time period can be set to 2 minutes after the vacuum pump is turned off. When the pressure value corresponding to the preset time period rises by less than 0.2bar, the corresponding air tightness test result is determined to be passed, and the battery pack meets the air tightness requirements. After the air tightness test is completed, the second detection interface on the detection connection device is opened to complete the air intake and the air tightness test.

[0093] Through the embodiments of the present disclosure, it is possible to perform air tightness testing on the battery pack of the entire vehicle without disassembling the battery pack, thereby improving the detection efficiency. Moreover, the operation is simple, the requirements for sites, equipment, and personnel are low, the implementation difficulty is low, and it is suitable for more application scenarios.

[0094] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the accompanying drawings may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0095] Based on the same inventive concept, the disclosed embodiment also provides a battery pack airtightness detection device for implementing the battery pack airtightness detection method mentioned above. The solution to the problem provided by the device is similar to the solution described in the above method, so the specific limitations in the embodiments of the battery pack airtightness detection device provided below can refer to the limitations of the battery pack airtightness method above, and will not be repeated here.

[0096] In one embodiment, Figure 6 As shown, a battery pack air tightness detection device 600 is provided, the battery pack is arranged on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface through an airway, and the device comprises:

[0097] An acquisition module 610 is used to acquire pressure data of the second interface in a preset time period;

[0098] The determination module 620 is used to determine the air tightness test result of the battery pack based on the pressure data.

[0099] In one embodiment, the acquisition module includes:

[0100] a first connection submodule, used for connecting the pressure regulating device to the second interface in response to an airtightness detection signal, and switching the pressure regulating device to a working state;

[0101] an acquisition submodule, configured to switch the pressure regulating device to a non-working state and acquire pressure data of the second interface in a preset time period when the pressure value of the battery pack is within a preset pressure value range;

[0102] The determining module comprises:

[0103] The determination submodule is used to determine the airtightness test result corresponding to the pressure data based on the correlation between the change amount of the pressure data and the airtightness test result of the battery pack.

[0104] In one embodiment, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0105] In one embodiment, the first interface is connected to a third interface on the vehicle through the airway, the second detection interface of the detection connection device is connected to the third interface, and the device further comprises:

[0106] a cut-off submodule, used to cut off the second detection interface from the third interface in response to an airtightness detection signal; and / or,

[0107] The second connection submodule is used to connect the second detection interface with the third interface in response to the airtightness detection end signal.

[0108] In one embodiment, the detection connection device is arranged in a charging device of the vehicle.

[0109] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0110] In one embodiment, the pressure regulating device includes at least one of a vacuum pump and a high-pressure gas source.

[0111] Each module in the above-mentioned battery pack airtightness device can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0112] Based on the same inventive concept, a battery pack airtightness detection system is also provided. The implementation scheme for solving the problem provided by the system is similar to the implementation scheme described in the above method. Therefore, the specific limitations in the embodiments of the airtightness detection system for one or more battery packs provided below can refer to the limitations of the battery pack airtightness method described above, and will not be repeated here. In one embodiment, a battery pack airtightness detection system is provided, and the system includes:

[0113] A battery pack disposed in a body of a vehicle, the battery pack being provided with a first interface, the first interface being connected to a second interface on the vehicle through an air passage;

[0114] A processor is used to obtain pressure data of the second interface in a preset time period, and determine the air tightness test result of the battery pack based on the pressure data.

[0115] In one embodiment, obtaining the pressure data of the second interface in a preset time period includes:

[0116] In response to the air tightness detection signal, connecting the pressure regulating device to the second interface and switching the pressure regulating device to a working state;

[0117] When the pressure value of the battery pack is within a preset pressure value range, switching the pressure regulating device to a non-working state, and acquiring pressure data of the second interface in a preset time period;

[0118] The step of determining the air tightness test result of the battery pack based on the pressure data includes:

[0119] Based on the correlation between the change in the pressure data and the airtightness test result of the battery pack, the airtightness test result corresponding to the pressure data is determined.

[0120] In one embodiment, the pressure regulating device is connected to the second interface via a first detection interface of a detection connection device.

[0121] In one embodiment, the first interface is connected to a third interface on the vehicle through the airway, and the second detection interface of the detection connection device is connected to the third interface, and the method further includes:

[0122] In response to the airtightness detection signal, disconnecting the second detection interface from the third interface; and / or,

[0123] In response to the airtightness detection end signal, the second detection interface is connected to the third interface.

[0124] In one embodiment, the detection connection device is arranged in a charging device of the vehicle.

[0125] In one embodiment, a spare interface of the AC charging connector of the vehicle is used as the second interface.

[0126] In one embodiment, the pressure regulating device includes at least one of a vacuum pump and a high-pressure gas source.

[0127] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0128] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0129] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0130] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present disclosure are all information and data authorized by the user or fully authorized by all parties.

[0131] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the embodiments of the present disclosure can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in the embodiments of the present disclosure may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited thereto. The processor involved in each embodiment provided in the embodiments of the present disclosure may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited thereto.

[0132] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0133] The above-described embodiments only express several implementation methods of the embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the embodiments of the present disclosure. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the embodiments of the present disclosure, and these all belong to the protection scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure shall be subject to the attached claims.

Claims

1. A method for detecting the air tightness of a battery pack, characterized in that: The battery pack is disposed on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface via an airway, and the method comprises: Acquiring pressure data of the second interface in a preset time period; Based on the pressure data, an airtightness test result of the battery pack is determined.

2. The method according to claim 1, characterized in that: The obtaining of the pressure data of the second interface in a preset time period includes: In response to the air tightness detection signal, connecting the pressure regulating device to the second interface and switching the pressure regulating device to a working state; When the pressure value of the battery pack is within a preset pressure value range, switching the pressure regulating device to a non-working state, and acquiring pressure data of the second interface in a preset time period; The step of determining the air tightness test result of the battery pack based on the pressure data includes: Based on the correlation between the change in the pressure data and the airtightness test result of the battery pack, the airtightness test result corresponding to the pressure data is determined.

3. The method according to claim 2, characterized in that The pressure regulating device is connected to the second interface via the first detection interface of the detection connection device.

4. The method according to claim 3, characterized in that The first interface is connected to a third interface on the vehicle through the airway, and the second detection interface of the detection connection device is connected to the third interface. The method further includes: In response to the airtightness detection signal, disconnecting the second detection interface from the third interface; and / or, In response to the airtightness detection end signal, the second detection interface is connected to the third interface.

5. The method according to claim 3, characterized in that: The detection connection device is arranged in the charging equipment of the vehicle.

6. The method according to claim 1, characterized in that A spare interface of the AC charging connector of the vehicle is used as the second interface.

7. A battery pack air tightness detection device, characterized in that: The battery pack is arranged on a vehicle, the battery pack is provided with a first interface, the vehicle is provided with a second interface, the first interface is connected to the second interface through an airway, and the device comprises: An acquisition module, used for acquiring pressure data of the second interface in a preset time period; A determination module is used to determine the air tightness test result of the battery pack based on the pressure data.

8. A battery pack air tightness detection system, characterized in that: The system comprises: A battery pack disposed in a body of a vehicle, the battery pack being provided with a first interface, the first interface being connected to a second interface on the vehicle through an air passage; A processor is used to obtain pressure data of the second interface in a preset time period, and determine the air tightness test result of the battery pack based on the pressure data.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the airtightness detection method of the battery pack according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the airtightness detection method of the battery pack according to any one of claims 1 to 6 are implemented.

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