Air tightness detection system and method, battery management system and storage medium

Abstract

The invention discloses an air tightness detection system and method, a battery management system and a storage medium, and belongs to the technical field of vehicles. According to the air tightness detection system provided by the invention, the electromagnetic air valve is controlled to be attracted through the battery management system, after the electromagnetic air valve is attracted, a closed space is formed in the battery pack, then the battery management system controls the air pump to pressurize the battery pack, the pressure value in the battery pack is detected through the pressure sensor, and the air tightness is detected according to the pressure value in the battery pack. And detecting the air tightness of the battery pack. As the pressure sensor, the air pump and the battery management system are all located in the battery pack, the system can detect the air tightness of the battery pack without disassembling the battery pack, the consumed time is short, and the detection efficiency is higher.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an airtightness detection system, method, battery management system and storage medium. Background Art

[0002] With the development of vehicle technology, new energy vehicles are becoming more and more popular. Among them, battery packs are essential components of new energy vehicles, and air tightness is an important indicator affecting the safety performance of battery packs. When the battery pack has air leakage or other air tightness problems that do not meet the standards, water will enter the battery pack, causing insulation failures such as short circuits, and then causing the car to spontaneously combust, threatening the life safety of users. Summary of the invention

[0003] The embodiments of the present application provide an airtightness detection system, method, battery management system and storage medium, which can detect the airtightness of a battery pack without disassembling the battery pack, and the detection efficiency is higher. The technical solution is as follows:

[0004] On the one hand, an air tightness detection system is provided, the system comprising: a battery management system, an electromagnetic air valve, an air pump and a pressure sensor; the battery management system, the air pump and the pressure sensor are all located in a battery pack, and the electromagnetic air valve is located on the box of the battery pack; the electromagnetic air valve, the air pump and the pressure sensor are all electrically connected to the battery management system; wherein,

[0005] The battery management system is used to receive an air tightness detection instruction, and based on the air tightness detection instruction, control the electromagnetic air valve to close, and control the air pump to inflate the battery pack to increase the pressure;

[0006] The pressure sensor is used to detect the pressure value in the battery pack and send the detected pressure value to the battery management system;

[0007] The battery management system is further used to detect the air tightness of the battery pack based on the pressure value sent by the pressure sensor.

[0008] In one possible implementation, the battery management system is used to control the air pump to stop working, determine the first pressure value at the current moment, and start the timer when the pressure value received from the pressure sensor is not less than a preset pressure threshold; determine the second pressure value when the timing reaches a preset time; and detect the air tightness of the battery pack based on the first pressure value and the second pressure value.

[0009] In another possible implementation, the battery management system is used to determine a difference between the first pressure value and the second pressure value to obtain a pressure difference;

[0010] When the pressure difference is less than the preset pressure difference, it is determined that the air tightness of the battery pack is qualified;

[0011] When the pressure difference is not less than the preset pressure difference, it is determined that the airtightness of the battery pack is unqualified.

[0012] In another possible implementation, the system further includes: a control device, the control device being electrically connected to the battery management system;

[0013] The control device is used to send the airtightness detection instruction to the battery management system.

[0014] In another possible implementation, the battery management system is further configured to send a first signal to the control device when the air tightness of the battery pack is qualified;

[0015] The control device is further used to control the vehicle to enter a driving mode or a charging mode based on the first signal;

[0016] The battery management system is further configured to send a second signal to the control device when the air tightness of the battery pack is unqualified;

[0017] The control device is further used to prohibit the vehicle from entering a driving mode or a charging mode based on the second signal.

[0018] In another possible implementation, the battery management system is further configured to light a fault light through an instrument when the air tightness of the battery pack fails to meet the requirements.

[0019] On the other hand, a method for detecting airtightness is provided, the method comprising:

[0020] Receive airtightness detection instructions;

[0021] Based on the air tightness detection instruction, the electromagnetic air valve is controlled to be closed, and the air pump is controlled to inflate the battery pack to increase the pressure;

[0022] receiving a pressure value sent by a pressure sensor, wherein the pressure sensor is used to detect a pressure value in the battery pack;

[0023] The air tightness of the battery pack is detected based on the pressure value sent by the pressure sensor.

[0024] In a possible implementation, the detecting the air tightness of the battery pack based on the pressure value sent by the pressure sensor includes:

[0025] When the pressure value sent by the pressure sensor is not less than the preset pressure threshold, the air pump is controlled to stop working, the first pressure value at the current moment is determined, and a timer is started;

[0026] Determine a second pressure value when the timing duration reaches a preset duration;

[0027] The air tightness of the battery pack is detected based on the first pressure value and the second pressure value.

[0028] In another possible implementation, the detecting the air tightness of the battery pack based on the first pressure value and the second pressure value includes:

[0029] determining a difference between the first pressure value and the second pressure value to obtain a pressure difference;

[0030] When the pressure difference is less than the preset pressure difference, it is determined that the air tightness of the battery pack is qualified;

[0031] When the pressure difference is not less than the preset pressure difference, it is determined that the airtightness of the battery pack is unqualified.

[0032] In another possible implementation, the method further includes:

[0033] When the air tightness of the battery pack is qualified, a first signal is sent to a control device; the control device is used to control the vehicle to enter a driving mode or a charging mode based on the first signal;

[0034] When the air tightness of the battery pack is unqualified, a second signal is sent to the control device; the control device is used to prohibit the vehicle from entering the driving mode or the charging mode based on the second signal.

[0035] In another possible implementation, the method further includes:

[0036] When the air tightness of the battery pack fails to meet the requirements, a fault light is turned on through the instrument.

[0037] On the other hand, a battery management system is provided, which includes a processor and a memory, wherein at least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement any of the airtightness detection methods described above.

[0038] On the other hand, a computer-readable storage medium is provided, in which at least one program code is stored. The at least one program code is loaded and executed by a processor to implement any of the airtightness detection methods described above.

[0039] On the other hand, a computer program product is provided, wherein at least one program code is stored in the computer program product, and the at least one program code is loaded and executed by a processor to implement any of the airtightness detection methods described above.

[0040] The embodiment of the present application provides an air tightness detection system, in which the battery management system controls the electromagnetic air valve to be closed. After the electromagnetic air valve is closed, a closed space is formed in the battery pack. Then the battery management system controls the air pump to pressurize the battery pack, and detects the pressure value in the battery pack through the pressure sensor. According to the pressure value in the battery pack, the air tightness of the battery pack is detected. Since the pressure sensor, air pump and battery management system are all located in the battery pack, the system can detect the air tightness of the battery pack without disassembling the battery pack, and the detection efficiency is higher.

[0041] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of an airtightness detection system provided in an embodiment of the present application;

[0043] Figure 2 is a flow chart of an airtightness detection method provided in an embodiment of the present application;

[0044] Figure 3 is a schematic diagram of detecting the air tightness of a battery pack provided in an embodiment of the present application;

[0045] Figure 4 It is a structural block diagram of a battery management system provided in an embodiment of the present application.

[0046] The reference numerals represent:

[0047] 10-battery management system, 11-electromagnetic air valve, 12-air pump, 13-pressure sensor, 14-battery pack, 15-control device. DETAILED DESCRIPTION

[0048] In order to make the technical solutions and advantages of the present application clearer, the implementation methods of the present application are described in further detail below.

[0049] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0050] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions. For example, the pressure, instructions, signals, etc. involved in this application are all obtained with full authorization.

[0051] Figure 1 is a schematic diagram of an airtightness detection system provided in an embodiment of the present application, see Figure 1 The system includes: a battery management system 10, an electromagnetic air valve 11, an air pump 12 and a pressure sensor 13; the battery management system 10, the air pump 12 and the pressure sensor 13 are all located in a battery pack 14, and the electromagnetic air valve 11 is located on the box of the battery pack 14; the electromagnetic air valve 11, the air pump 12 and the pressure sensor 13 are all electrically connected to the battery management system 10; wherein,

[0052] The battery management system 10 is used to receive an air tightness detection instruction, and based on the air tightness detection instruction, control the electromagnetic air valve 11 to close, and control the air pump 12 to inflate the battery pack 14 to increase the pressure;

[0053] The pressure sensor 13 is used to detect the pressure value in the battery pack 14 and send the detected pressure value to the battery management system 10;

[0054] The battery management system 10 is also used to detect the air tightness of the battery pack 14 based on the pressure value sent by the pressure sensor 13 .

[0055] The battery management system 10, the air pump 12 and the pressure sensor 13 are all located in the battery pack 14. The specific positions of the battery pack 14 can be set and changed as needed, and are not specifically limited. For example, the pressure sensor 13 is located at any position on the inner wall of the battery pack 14, and the air pump 12 is located at any position on the bottom or top of the battery pack 14.

[0056] The electromagnetic air valve 11 is located on the box of the battery pack 14. Its position on the box can be set and changed as needed, and there is no specific limitation on this. For example, the electromagnetic air valve 11 is located at any position on the upper surface, any position on the side, or any position on the lower surface of the box of the battery pack 14.

[0057] In the embodiment of the present application, the battery management system 10 can control the electromagnetic air valve 11 to be closed or disconnected. When the electromagnetic air valve 11 is closed, the inside of the battery pack 14 is isolated from the outside, and a closed space is formed inside the battery pack 14; when the electromagnetic air valve 11 is disconnected, the inside of the battery pack 14 is connected to the outside.

[0058] The electrical connection may be a circuit connection or a wireless connection, which is not specifically limited. If the electrical connection is a circuit connection, the connection method may be a cable connection. If the electrical connection is a wireless connection, the connection method may be a wireless local area network or a WiFi (Wireless Fidelity) network connection. In the embodiments of the present application, this is not specifically limited.

[0059] The airtightness detection system provided in the present application can be used in electric vehicles or hybrid vehicles, without specific limitation.

[0060] In one possible implementation, the battery management system 10 is used to control the air pump 12 to stop working, determine the first pressure value at the current moment, and start the timer when the pressure value sent by the pressure sensor 13 is not less than a preset pressure threshold; determine the second pressure value when the timing reaches a preset time; and detect the airtightness of the battery pack 14 based on the first pressure value and the second pressure value.

[0061] In another possible implementation, the battery management system 10 is configured to determine a difference between the first pressure value and the second pressure value to obtain a pressure difference;

[0062] When the pressure difference is less than the preset pressure difference, it is determined that the air tightness of the battery pack 14 is qualified;

[0063] When the pressure difference is not less than the preset pressure difference, it is determined that the airtightness of the battery pack 14 is unqualified.

[0064] In another possible implementation, the system further includes: a control device 15 , the control device 15 being electrically connected to the battery management system 10 ;

[0065] The control device 15 is used to send an airtightness detection instruction to the battery management system 10.

[0066] In the embodiment of the present application, the control device 15 may be a vehicle controller or any other controller, and there is no specific limitation on this.

[0067] In another possible implementation, the battery management system 10 is further configured to send a first signal to the control device 15 when the air tightness of the battery pack 14 is qualified;

[0068] The control device 15 is further used to control the vehicle to enter a driving mode or a charging mode based on the first signal;

[0069] The battery management system 10 is further configured to send a second signal to the control device 15 when the air tightness of the battery pack 14 is unqualified;

[0070] The control device 15 is further configured to prohibit the vehicle from entering the driving mode or the charging mode based on the second signal.

[0071] In another possible implementation, the battery management system 10 is also used to light a fault light through an instrument when the air tightness of the battery pack 14 fails to meet the requirements.

[0072] In the related art, when the battery pack 14 is tested for air tightness, the battery pack 14 needs to be disassembled, and then the air tightness of the battery pack 14 is tested by a specific device. After the test is completed, the battery pack 14 is installed on the vehicle. It can be seen that the testing method in the related art takes a long time and has low testing efficiency.

[0073] The air tightness detection system provided in the embodiment of the present application controls the electromagnetic air valve 11 to close through the battery management system 10. After the electromagnetic air valve 11 is closed, a closed space is formed in the battery pack 14. Then the battery management system 10 controls the air pump 12 to pressurize the battery pack 14, and detects the pressure value in the battery pack 14 through the pressure sensor 13. According to the pressure value in the battery pack 14, the air tightness of the battery pack 14 is detected. Since the pressure sensor 13, the air pump 12 and the battery management system 10 are all located in the battery pack 14, the system can detect the air tightness of the battery pack 14 without disassembling the battery pack 14, which takes less time and has higher detection efficiency.

[0074] Furthermore, when the air tightness of the battery pack 14 is qualified, the vehicle directly enters the driving mode or the charging mode, and there is no need to install the battery pack 14 on the vehicle, which does not affect the user's normal driving or charging, thereby improving the user experience.

[0075] The airtightness detection system and the airtightness detection method provided in the present application belong to the same concept. The specific process is detailed in the embodiment of the airtightness detection method, which will not be repeated here.

[0076] Figure 2 is a flow chart of an air tightness detection method provided in an embodiment of the present application, which is executed by a battery management system, see Figure 2 , the method comprising:

[0077] Step 201: The battery management system receives an airtightness detection instruction.

[0078] In this step, when the vehicle is in the OFF gear sleep mode, when the vehicle is disarmed or the charging gun is inserted, the battery management system and the control device are awakened. After the battery management system and the control device are awakened, the control device sends an airtightness detection instruction to the battery management system, and correspondingly, the battery management system receives the airtightness detection instruction sent by the control device.

[0079] Among them, the battery management system and control device can be awakened by hard wire or by network management, and there is no specific limitation on this. Hard wire wake-up can be low voltage wake-up on the key, that is, vehicle wake-up by key unlocking, or OBC (On-board Charger) hard wire wake-up. Network management wake-up can be awakened by CAN (Controller Area Network) signal. For example, when the vehicle is unlocked, the battery management system and control device are awakened by the key signal; when the vehicle is plugged into the charging gun, it is awakened by OBC.

[0080] Step 202: Based on the air tightness detection instruction, the battery management system controls the electromagnetic air valve to close and controls the air pump to inflate the battery pack to increase the pressure.

[0081] After receiving the air tightness test instruction, the battery management system controls the electromagnetic air valve to close. After the electromagnetic air valve is closed, an enclosed space is formed inside the battery pack. The battery management system then controls the air pump to inflate the battery pack, thereby pressurizing the battery pack.

[0082] The air pump may be an electric air pump or other types of air pumps that can inflate the battery pack, and there is no specific limitation on this.

[0083] Step 203: The battery management system receives the pressure value sent by the pressure sensor.

[0084] The pressure sensor is used to detect the pressure value inside the battery pack.

[0085] The pressure sensor can detect the pressure value in the battery pack in real time, can detect the pressure value in the battery pack periodically, or can detect the pressure value in the battery pack when receiving a detection instruction sent by the battery management system, and there is no specific limitation on this. In the embodiment of the present application, only the pressure sensor detecting the pressure value in the battery pack when receiving a detection instruction sent by the battery management system is used as an example for explanation.

[0086] When the battery management system controls the air pump to pressurize the battery pack, it sends a first detection instruction to the pressure sensor. The pressure sensor receives the first detection instruction, detects the pressure value in the battery pack, and sends the detected pressure value to the battery management system. Correspondingly, the battery management system receives the pressure value sent by the pressure sensor.

[0087] Step 204: The battery management system detects the air tightness of the battery pack based on the pressure value sent by the pressure sensor.

[0088] When the battery management system receives a pressure value sent by the pressure sensor that is not less than a preset pressure threshold, it controls the air pump to stop working, determines the first pressure value at the current moment, and starts the timer; then determines the second pressure value when the timing reaches the preset time; based on the first pressure value and the second pressure value, the air tightness of the battery pack is tested.

[0089] In a possible implementation, after the timing starts, the battery management system sends a first stop instruction to the pressure sensor, and the pressure sensor receives the first stop instruction and stops detecting the pressure value in the battery pack. When the timing duration reaches a preset duration, the battery management system sends a second detection instruction to the pressure sensor, and the pressure sensor detects the pressure value in the battery pack at this time, that is, the second pressure value, based on the second detection instruction, and sends the second pressure value to the battery management system, and the battery management system receives the second pressure value.

[0090] In another possible implementation, after the timing starts, the pressure sensor detects the pressure value in the battery pack in real time or periodically, and sends the detected pressure value to the battery management system. The battery management system determines the time of each pressure value received, and stores the pressure value and its corresponding time in association. When the timing duration reaches a preset duration, the battery management system determines the pressure value corresponding to the preset duration based on the association between the pressure value and time, and obtains a second pressure value.

[0091] It should be noted that, after the battery management system determines the second pressure value, it can send a second stop instruction to the pressure sensor, and the pressure sensor stops detecting the pressure value in the battery pack based on the second stop instruction.

[0092] The process of the battery management system detecting the airtightness of the battery pack based on the first pressure value and the second pressure value can be: the battery management system determines the difference between the first pressure value and the second pressure value to obtain the pressure difference; when the pressure difference is less than the preset pressure difference, the airtightness of the battery pack is determined to be qualified; when the pressure difference is not less than the preset pressure difference, the airtightness of the battery pack is determined to be unqualified.

[0093] The preset pressure difference, the preset pressure threshold, and the preset time duration can be set and changed as needed, and are not specifically limited thereto. For example, the preset pressure difference is 0.1 bar, the preset pressure threshold is 1 bar, and the preset time duration is 1 second.

[0094] In an embodiment of the present application, after the air tightness test is completed, the battery management system controls the electromagnetic air valve to reset, thereby restoring the pressure balance inside and outside the battery pack. In addition, the battery management system can also send the test results to the control device. The specific process may be: when the air tightness of the battery pack is qualified, the battery management system sends a first signal to the control device; the control device controls the vehicle to enter the driving mode or the charging mode based on the first signal. When the air tightness of the battery pack is unqualified, the battery management system sends a second signal to the control device; the control device prohibits the vehicle from entering the driving mode or the charging mode based on the second signal.

[0095] In this implementation, when the air tightness of the battery pack is qualified, the battery management system sends a signal of qualified air tightness to the control device, that is, the first signal. Based on the first signal, the control device issues a high-voltage instruction, thereby causing the vehicle to enter the driving mode or charging mode. When the air tightness of the battery pack is unqualified, the battery management system sends a fault position alarm signal to the control device, that is, the second signal. Based on the second signal, the control device prohibits the vehicle from applying high voltage, thereby prohibiting the vehicle from entering the driving mode or charging mode.

[0096] In the embodiment of the present application, when the battery pack is airtight, the vehicle directly enters the driving mode or charging mode, and the battery pack does not need to be installed on the vehicle, which does not affect the user's normal driving or charging, thereby improving the user experience. In addition, the vehicle can only enter the driving mode or charging mode when the battery pack is airtight, and when the battery pack is not airtight, the vehicle is prohibited from entering the driving mode or charging mode, thereby preventing water from entering the battery pack, causing insulation failures such as short circuits, and protecting the user's life safety.

[0097] In addition, when the airtightness of the battery pack is not up to standard, the battery management system can also light up the fault light through the instrument, so that the user can clearly know that there is a problem with the airtightness of the battery pack by observing the fault light, so as to repair the vehicle in time, thereby further ensuring the user's life safety.

[0098] When the air tightness of the battery pack is not up to standard, the battery management system can also alarm in other ways to remind the user, which will not be repeated here.

[0099] See also Figure 3 , Figure 3 This is a schematic diagram for testing the air tightness of the battery pack. Figure 3It can be seen that when the vehicle is unarmed or a fast or slow charging gun is inserted, the battery management system and the vehicle controller are awakened. The vehicle controller sends an airtightness detection instruction to the battery management system. The battery management system receives the airtightness detection instruction, controls the electromagnetic air valve to close, and controls the air pump to start working to pressurize the battery pack. When the pressure value in the battery pack is greater than 1 bar, the air pump stops working and determines the pressure value P0 in the battery pack at this time. Start the timer to start timing. When the timing ends, determine the pressure value P1 in the battery pack at this time. Determine whether P0-P1 is greater than 0.1 bar. If P0-P1≥0.1 bar, it means that there is a leak in the air tightness of the battery pack. The battery management system controls the electromagnetic air valve to reset, and sends a fault position alarm signal to the vehicle controller, and lights the fault light through the instrument. The vehicle controller prohibits the vehicle from applying high voltage. If P0-P1 is less than 0.1 bar, it indicates that the battery pack has good air tightness. The battery management system controls the electromagnetic air valve to reset and sends a signal indicating good air tightness to the vehicle controller. After receiving the signal, the vehicle controller issues a high-voltage command, allowing the vehicle to go high voltage, and the vehicle enters driving mode or charging mode.

[0100] In an embodiment of the present application, when the pressure difference is not less than the preset pressure difference, it indicates that there is a problem with the airtightness of the battery pack, that is, the battery pack has a fault. Accordingly, the battery management system can determine the fault level of the battery pack according to the size of the pressure difference. The process may be: the battery management system pre-stores the correspondence between the pressure difference range and the fault level, and different pressure difference ranges correspond to different fault levels. After obtaining the pressure difference, the battery management system may first determine whether the pressure difference is less than the preset pressure difference. If the pressure difference is not less than the preset pressure difference, the pressure difference range in which the pressure difference is located is determined, and then the fault level corresponding to the pressure difference range is determined according to the correspondence between the pressure difference range and the fault level, and the fault level is carried in the second signal sent to the control device.

[0101] For example, the battery management system is divided into three pressure difference ranges, namely the first pressure difference range, the second pressure difference range and the third pressure difference range, wherein the first pressure difference range corresponds to the first fault level, the second pressure difference range corresponds to the second fault level, the third pressure difference range corresponds to the third fault level, the minimum value of the first pressure difference range is the preset pressure difference, the maximum value of the first pressure difference range is less than the minimum value of the second pressure difference range, and the maximum value of the second pressure difference range is less than the minimum value of the third pressure difference range. Accordingly, the leakage degree of the third fault level is greater than the leakage degree of the second fault level, and the leakage degree of the second fault level is greater than the leakage degree of the first fault level.

[0102] For example, the preset pressure difference is 0.1 bar, the first pressure difference range is [0.1, 0.2) bar, the second pressure difference range is [0.2, 0.3) bar, and the third pressure difference range is [0.3, 0.4) bar. The endpoint value of the first pressure difference range does not include 0.2. Similarly, the endpoint value of the second pressure difference range does not include 0.3, and the endpoint value of the third pressure difference range does not include 0.4. The third fault level is severe air leakage, the second fault level is moderate air leakage, and the first fault level is mild air leakage.

[0103] The battery management system may also be divided into two or more pressure difference ranges, and the above is only an example and is not specifically limited to this.

[0104] For the control device, after receiving the second signal, the control device can perform an operation matching the fault level according to the fault level, thereby ensuring the life safety of the user.

[0105] For example, the operation corresponding to the first fault level is to control the device to play a first voice message through the voice device to inform the user that the battery pack has a gas leak. For example, the first voice message is "The battery pack has a slight gas leak, please repair it as soon as possible."

[0106] The operation corresponding to the second fault level is that the control device plays a second voice message through the voice device and / or issues an audible and visual alarm through the alarm device. For example, the second voice message is "There is a moderate gas leak in the battery pack, please repair it as soon as possible."

[0107] The operation corresponding to the third fault level is that the control device plays a third voice message through the voice device and prohibits the vehicle from being high voltage, thereby prohibiting the vehicle from entering the driving mode or the charging mode. For example, the third voice message is "The battery pack has a severe gas leak, please repair it as soon as possible."

[0108] For any of the above fault levels, the battery management system can light up the fault light through the instrument.

[0109] In the embodiment of the present application, different fault levels are used to remind the user in different ways, so that the user can clearly know the degree of leakage of the battery pack.

[0110] The embodiment of the present application provides an air tightness detection method, which first controls the electromagnetic air valve to close, after which a closed space is formed in the battery pack, and then controls the air pump to pressurize the battery pack, and detects the pressure value in the battery pack through the pressure sensor, and detects the air tightness of the battery pack according to the pressure value in the battery pack. It can be seen that this method can detect the air tightness of the battery pack without disassembling the battery pack, which takes less time and has higher detection efficiency.

[0111] The structural block diagram of the battery management system can be found in Figure 4 The battery management system 400 may have relatively large differences due to different configurations or performances, and may include a processor (Central Processing Units, CPU) 401 and a memory 402, wherein the memory 402 stores at least one program code, and the at least one program code is loaded and executed by the processor 401 to implement the operations performed by the battery management system in the above-mentioned airtightness detection method. Of course, the battery management system 400 may also have components such as a wired or wireless network interface, a keyboard, and an input and output interface for input and output, and the electronic device 400 may also include other components for implementing device functions, which will not be repeated here.

[0112] The structural block diagram of the control device can also be found in Figure 4 , I will not go into details here.

[0113] In an exemplary embodiment, a computer-readable storage medium is further provided. The computer-readable storage medium stores at least one program code. The at least one program code is loaded and executed by a processor to implement the airtightness detection method in the above embodiment.

[0114] In an exemplary embodiment, a computer program product is further provided. The computer program product stores at least one program code. The at least one program code is loaded and executed by a processor to implement the airtightness detection method in the above embodiment.

[0115] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0116] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An airtightness detection system, characterized in that: The system includes: a battery management system, an electromagnetic air valve, an air pump and a pressure sensor; the battery management system, the air pump and the pressure sensor are all located in a battery pack, and the electromagnetic air valve is located on the box of the battery pack; the electromagnetic air valve, the air pump and the pressure sensor are all electrically connected to the battery management system; wherein, The battery management system is used to receive an air tightness detection instruction, and based on the air tightness detection instruction, control the electromagnetic air valve to close, and control the air pump to inflate the battery pack to increase the pressure; The pressure sensor is used to detect the pressure value in the battery pack and send the detected pressure value to the battery management system; The battery management system is further used to detect the air tightness of the battery pack based on the pressure value sent by the pressure sensor.

2. The system according to claim 1, characterized in that The battery management system is used to control the air pump to stop working when the pressure value received from the pressure sensor is not less than a preset pressure threshold, determine the first pressure value at the current moment, and start the timer; determine the second pressure value when the timing reaches a preset time; and detect the air tightness of the battery pack based on the first pressure value and the second pressure value.

3. The system according to claim 2, characterized in that The battery management system is used to determine the difference between the first pressure value and the second pressure value to obtain a pressure difference; When the pressure difference is less than the preset pressure difference, it is determined that the air tightness of the battery pack is qualified; When the pressure difference is not less than the preset pressure difference, it is determined that the airtightness of the battery pack is unqualified.

4. The system according to claim 1, characterized in that The system further comprises: a control device, the control device being electrically connected to the battery management system; The control device is used to send the airtightness detection instruction to the battery management system.

5. The system according to claim 4, characterized in that The battery management system is further configured to send a first signal to the control device when the air tightness of the battery pack is qualified; The control device is further used to control the vehicle to enter a driving mode or a charging mode based on the first signal; The battery management system is further configured to send a second signal to the control device when the air tightness of the battery pack is unqualified; The control device is further used to prohibit the vehicle from entering a driving mode or a charging mode based on the second signal.

6. The system according to claim 1, characterized in that The battery management system is also used to light a fault light through an instrument when the air tightness of the battery pack fails to meet the requirements.

7. A method for detecting air tightness, characterized in that: The method comprises: Receive airtightness detection instructions; Based on the air tightness detection instruction, the electromagnetic air valve is controlled to be closed, and the air pump is controlled to inflate the battery pack to increase the pressure; receiving a pressure value sent by a pressure sensor, wherein the pressure sensor is used to detect a pressure value in the battery pack; The air tightness of the battery pack is detected based on the pressure value sent by the pressure sensor.

8. A battery management system, characterized in that: The battery management system includes a processor and a memory, wherein at least one program code is stored in the memory, and the at least one program code is loaded and executed by the processor to implement the airtightness detection method as described in claim 7.

9. A computer-readable storage medium, characterized in that: At least one program code is stored in the computer-readable storage medium, and the at least one program code is loaded and executed by the processor to implement the airtightness detection method as described in claim 7.

10. A computer program product, characterized in that The computer program product stores at least one program code, and the at least one program code is loaded and executed by a processor to implement the airtightness detection method as claimed in claim 7.

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