Detection system for battery explosion-proof valve, vehicle, detection method and storage medium

Abstract

The invention provides a detection system for a battery explosion-proof valve, a vehicle, a detection method and a storage medium. The detection system comprises a power supply and a battery explosion-proof valve, the battery anti-explosion valve comprises a valve body and a valve clack, one end of the power supply is connected with the valve clack of the battery anti-explosion valve, and the other end of the power supply is connected with the valve body of the battery anti-explosion valve. According to the scheme, the loop is formed by applying the voltage between the valve clack and the valve body of the battery anti-explosion valve, the working state of the battery anti-explosion valve can be judged by using the current value or the voltage value in the loop, and real-time detection of the state of the battery anti-explosion valve is realized.

Description

Technical Field

[0001] This application relates to the field of battery safety testing technology, and in particular to a testing system, vehicle, testing method and storage medium for battery explosion-proof valves. Background Technology

[0002] With the rapid development of electric vehicles and energy storage systems, lithium-ion batteries are widely used due to their high energy density and long cycle life. However, lithium-ion batteries are susceptible to thermal runaway under abnormal operating conditions, which can lead to gas production, fire, or even explosion. To address the increased internal pressure caused by thermal runaway gas production, batteries are typically equipped with explosion-proof valves. These valves rupture or open when the internal pressure reaches a certain threshold, releasing gas to prevent the battery casing from exploding.

[0003] However, existing technologies for monitoring the status of battery explosion-proof valves often have shortcomings. On one hand, many explosion-proof valves are disposable structures; once pressure is released, they are damaged and require immediate replacement or repair. However, battery systems often lack effective means to monitor the operational status of these valves in real time. Traditional detection methods may require shutdown for inspection or disassembly, which is inefficient and fails to detect problems promptly. On the other hand, even in systems with explosion-proof valve detection capabilities, the detection principles and implementation methods may be complex, susceptible to environmental interference, or fail to fully consider the coordinated operation between the battery management system and the vehicle control system. This can lead to a failure to take timely and effective countermeasures after the explosion-proof valve activates; for example, failure to promptly de-energize after valve activation could result in further damage to the battery pack or a safety incident. Therefore, existing technologies still have room for improvement in real-time monitoring of battery explosion-proof valve status, reliability, and coordinated response with the vehicle control system.

[0004] Therefore, an improved battery explosion-proof valve detection solution is needed to solve at least one of the above-mentioned technical problems. Summary of the Invention

[0005] To address at least one of the technical problems in the prior art, such as untimely, unreliable, and insufficiently coordinated detection of battery explosion-proof valve status, this application provides a detection system, vehicle, detection method, and storage medium capable of real-time and accurate detection of the working status of battery explosion-proof valve.

[0006] According to a first aspect of this application, a detection system for a battery explosion-proof valve is provided, the detection system comprising: a power supply and a battery explosion-proof valve; the battery explosion-proof valve includes a valve body and a valve disc, one end of the power supply is connected to the valve disc of the battery explosion-proof valve, and the other end of the power supply is connected to the valve body of the battery explosion-proof valve.

[0007] In one embodiment, the detection system further includes a first resistor, which is disposed in a first line between one end of the power supply and the valve disc of the battery explosion-proof valve; or, the first resistor is disposed in a second line between the other end of the power supply and the valve body of the battery explosion-proof valve.

[0008] In one embodiment, the power supply is a DC power supply with a voltage between 5mV and 10mV, and the resistance of the first resistor is between 50Ω and 100Ω.

[0009] In one embodiment, the detection system further includes a unidirectional diode; the unidirectional diode is disposed in the first line or the second line.

[0010] In one embodiment, the battery explosion-proof valve is located near the battery and is isolated from other components of the battery by insulating material.

[0011] In one embodiment, the detection system further includes a battery management system, which is connected to a first or second line between the power supply and the battery explosion-proof valve via a sampling node. The battery management system is configured to collect current or voltage values ​​at the sampling node and determine the state of the battery explosion-proof valve based on the current or voltage values.

[0012] In one embodiment, the battery management system is configured to: determine that the battery explosion-proof valve is in a non-operating state if the current value or the voltage value is greater than 0; and determine that the battery explosion-proof valve is in an operating state if the current value or the voltage value is equal to 0.

[0013] In one embodiment, the detection system further includes a vehicle controller connected to the battery management system. The battery management system is configured to send the operating status of the battery explosion-proof valve to the vehicle controller. The vehicle controller is configured to determine, based on the operating status of the battery explosion-proof valve, whether to send a high-voltage power-on command or a command not to allow high-voltage power-on, and whether to issue a warning.

[0014] In one embodiment, the vehicle controller is configured to: send a high-voltage power-on command to the battery management system when the battery explosion-proof valve is in an inactive state; and send a high-voltage power-on disallowing command to the battery management system and issue a battery status warning when the battery explosion-proof valve is in an active state.

[0015] According to a second aspect of this application, a vehicle is provided, the vehicle including the detection system described above.

[0016] According to a third aspect of this application, a detection method for a battery explosion-proof valve is provided, applied to the aforementioned detection system. The method includes: connecting one end of a power supply to the valve disc of the battery explosion-proof valve; and connecting the other end of the power supply to the valve body of the battery explosion-proof valve.

[0017] In one embodiment, the method further includes: using the battery management system in the detection system to perform the following steps: connecting a sampling node to a first line or a second line between the power supply and the battery explosion-proof valve, acquiring the current value or voltage value at the sampling node, and determining the state of the battery explosion-proof valve based on the current value or the voltage value.

[0018] In one embodiment, the method further includes: using the battery management system in the detection system to perform the following steps: sampling the current value or voltage value on the circuit between the power supply and the battery explosion-proof valve; if the current value or the voltage value is greater than 0, then determining that the battery explosion-proof valve is in a non-operating state; if the current value or the voltage value is equal to 0, then determining that the battery explosion-proof valve is in an operating state.

[0019] In one embodiment, the method further includes: using the vehicle controller in the detection system to perform the following steps: obtaining the working status of the battery explosion-proof valve sent by the battery management system; when the working status information of the battery explosion-proof valve is received as not working, sending a high-voltage power-on command to the battery management system; when the working status information of the battery explosion-proof valve is received as working, sending a high-voltage power-on not allowed command to the battery management system and performing a battery status warning.

[0020] According to a fourth aspect of this application, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the detection method described above.

[0021] Compared with the prior art, the beneficial effects of this application are as follows: This solution applies voltage between the valve disc and valve body of the battery explosion-proof valve to form a circuit. The operating status of the valve can be monitored in real time using the micro-current or voltage value within the circuit, and the data is uploaded to the battery management system. This prevents explosions and ensures safety, avoiding the lag and complexity of traditional detection methods. It provides clear guidance for early fault warning, location, repair, and replacement of battery systems, thereby improving the overall reliability and ease of maintenance of the battery system. Therefore, the beneficial effects of this detection solution are at least monitoring and reducing the risk of explosion or structural damage caused by abnormal pressure increases in closed or semi-closed battery cell systems, and it also provides a visual indication. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the specific embodiments of this application, the drawings used in the specific embodiments will be briefly introduced below. The drawings described below are some embodiments of this application. For those skilled in the art, other improved solutions can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a detection system for a battery explosion-proof valve according to an embodiment of the present invention; Figure 2 This is an exploded view of a battery explosion-proof valve assembly according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a battery explosion-proof valve assembly according to an embodiment of the present invention; Figure 4 This is a front view of a battery explosion-proof valve according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the connection relationship of a detection system according to an application embodiment of the present invention; Figure 6 This is a schematic diagram of a detection method according to an embodiment of the present invention. Detailed Implementation

[0024] To make the above and other features and advantages of this application clearer, the application is further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0025] In the following description, numerous specific details are set forth to provide a thorough understanding of this application. However, it will be apparent to those skilled in the art that the specific details are not required to practice this application. In other instances, well-known steps or operations have not been described in detail to avoid obscuring this application.

[0026] The detection system for battery explosion-proof valves provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0027] like Figure 1 As shown, this application provides a detection system 100 for a battery explosion-proof valve. The detection system 100 includes a power supply 110 and a battery explosion-proof valve 120. Specifically, as... Figures 2-4As shown, the battery explosion-proof valve 120 in this application may include a guide mechanism 101, a spring 102, a sealing ring 103, a first terminal 104, a valve body 105, a valve seat 106, a valve disc 107, and a second terminal 108. One end of the power supply 110 is connected to the valve disc 107 of the battery explosion-proof valve 120 through the first terminal 104, and the other end of the power supply 110 is connected to the valve body 105 of the battery explosion-proof valve 120 through the second terminal 108.

[0028] When the battery is in normal condition and the battery explosion-proof valve 120 is not working, the preload of the spring 102 is greater than the normal pressure inside the battery, the spring 102 is in a compressed state, the valve disc 107 and the valve body 105 are tightly fitted together, at this time the circuit between the power supply 110 and the battery explosion-proof valve 120 is in a conductive state, and the current and voltage values ​​in the circuit are not 0.

[0029] When the battery is in an abnormal thermal runaway state, the battery explosion-proof valve 120 is in the working state of depressurization. The preload of the spring 102 is less than the pressure inside the battery, the valve disc 107 is pushed open, and the valve disc 107 and the valve body 105 are isolated by air. At this time, the circuit between the power supply 110 and the battery explosion-proof valve 120 is in the open state, and the current value and voltage value in the circuit are 0.

[0030] Therefore, this application applies voltage between the valve disc 107 and the valve body 105 of the battery explosion-proof valve 120 to form a circuit. The operating status of the battery explosion-proof valve 120 can be determined by the current or voltage value in the circuit, realizing real-time monitoring of the status of the battery explosion-proof valve 120. This avoids the lag and complexity of traditional detection methods, provides clear guidance for the maintenance, repair and replacement of the battery system, and thus improves the overall reliability and maintenance convenience of the battery system.

[0031] Furthermore, in a preferred embodiment, the detection system 100 further includes a first resistor R1. This first resistor R1 can be disposed on a first line S1 between one end of the power supply 110 and the first terminal 104 (or valve disc 107), or on a second line S2 between the other end of the power supply 110 and the second terminal 108 (or valve body 105). The purpose of setting the first resistor R1 is to ensure that the current in the circuit is controlled within a preset range (e.g., 10mA), reducing the risk of electric shock and ensuring that a person can freely disconnect from the power source after a leakage; it also prevents excessive current from being generated on the battery explosion-proof valve 120, protecting the battery explosion-proof valve 120.

[0032] Here, the resistance value of the first resistor can be set between 50Ω and 100Ω. The DC power supply voltage can be controlled between 5mV and 10mV. These settings minimize unnecessary interference or damage to the battery or related circuits, ensuring the accuracy and safety of the test.

[0033] In another preferred embodiment, the detection system 100 further includes a unidirectional diode D2. The unidirectional diode D2 can be disposed on either the first line S1 or the second line S2. The purpose of disposing of the unidirectional diode D2 is to ensure that the circuit is unidirectionally conductive, ensuring that the current flows only in the designed direction, improving the stability and reliability of the detection, and simultaneously achieving partial voltage drop.

[0034] See Figure 5 Here, the connection method of the present application solution in a specific scenario is shown. In this embodiment, one end of the power supply 110 is connected to one end of the first resistor R1, the other end of the power supply 110 is connected to the cathode of the unidirectional diode D2, the other end of the first resistor R1 is connected to the valve body 105 of the battery explosion-proof valve 120, and the anode of the unidirectional diode D2 is connected to the valve body 107 of the battery explosion-proof valve 120.

[0035] Furthermore, to ensure the independence of the detection and avoid interference, the battery explosion-proof valve 120 is located near the battery and is isolated from other components of the battery by insulating material. This insulation ensures that the current in the detection circuit flows only through the battery explosion-proof valve 120, preventing false detections. Insulating materials such as insulating patches can be used here.

[0036] Furthermore, to achieve intelligent management of the status of the battery explosion-proof valve 120, the detection system 100 provided in this application may further include a battery management system (BMS). The BMS is connected to the power supply 110 and the battery explosion-proof valve 120 via a sampling node via a first line S1 or a second line S2.

[0037] The battery management system (BMS) is configured to perform the following functions: First, it collects the current or voltage value at the sampling node. Since changes in the connection state of the battery explosion-proof valve 12 will cause changes in the current or voltage value in the circuit, the BMS continuously monitors the current or voltage value on the first line S1 or the second line S2 through this sampling node, and determines the working state of the battery explosion-proof valve 120 based on the current or voltage value.

[0038] The specific judgment logic is as follows: If the current value or the voltage value is greater than 0 (i.e., the circuit is open, indicating that there is still an electrical connection between valve disc 107 and valve body 105), then the battery explosion-proof valve 120 is determined to be in a non-operating state. This means that the explosion-proof valve has not yet activated, the internal pressure of the battery is still within a safe range, or has not yet reached the pressure relief threshold. If the current value or the voltage value is equal to 0 (i.e., the circuit is open, indicating that there is no electrical connection between valve disc 107 and valve body 105), then the battery explosion-proof valve 120 is determined to be in an operating state. This means that the explosion-proof valve has activated, thermal runaway gas generation may have occurred inside the battery, and the pressure is being released.

[0039] Furthermore, to achieve deep interoperability and safe response between device components, the detection system 100 provided in this application may further include a vehicle controller (VCU). The vehicle controller (VCU) is connected to the battery management system (BMS).

[0040] The battery management system (BMS) is also configured to send the operating status of the battery explosion-proof valve 120 to the vehicle control unit (VCU). When the BMS detects a change in the status of the battery explosion-proof valve 120, it will promptly report the latest status to the VCU.

[0041] The vehicle control unit (VCU) is configured to determine, based on the operating status of the battery explosion-proof valve 120, whether to send a high-voltage power-on command or disallow a high-voltage power-on command to the battery management system (BMS), and whether to issue a warning. As the decision-making center of the vehicle, the VCU can take corresponding safety measures based on the explosion-proof valve status reported by the BMS.

[0042] The specific judgment logic is as follows: When the VCU receives a message indicating that the battery explosion-proof valve 120 is not in operation, it sends a high-voltage power-on command to the battery management system (BMS). This indicates that the battery system is in normal working condition, and the VCU allows the high-voltage system to operate normally. When the VCU receives a message indicating that the battery explosion-proof valve 120 is in operation, it sends a command to the BMS prohibiting high-voltage power-on and issues a battery status warning. This means that the battery explosion-proof valve 120 has activated, and there may be a safety risk to the battery. The VCU will immediately cut off the high voltage and issue an alarm to the driver or other relevant systems, such as through audible and visual indicators or screen displays, to alert the user.

[0043] This application enables timely detection and handling of activated battery explosion-proof valves by real-time monitoring of the status of the battery explosion-proof valve 120, providing clear guidance for the maintenance, repair, and replacement of the battery system, thereby improving the overall reliability and ease of maintenance of the battery system.

[0044] This application also provides a vehicle that includes the detection system described above.

[0045] This application also provides a detection method for battery explosion-proof valves, applied to the detection system described above, see [link to relevant documentation]. Figure 6 The method includes: Step 601: Connect one end of the power supply to the valve disc of the battery explosion-proof valve; Step 602: Connect the other end of the power supply to the valve body of the battery explosion-proof valve.

[0046] The method may further include: using the battery management system in the detection system to perform the following steps: connecting the sampling node to a first line or a second line between the power supply and the battery explosion-proof valve, collecting the current value or voltage value at the sampling node, and determining the state of the battery explosion-proof valve based on the current value or the voltage value.

[0047] The method further includes: using the battery management system in the detection system to perform the following steps: sampling the current value or voltage value on the circuit between the power supply and the battery explosion-proof valve; if the current value or the voltage value is greater than 0, then determining that the battery explosion-proof valve is in a non-working state; if the current value or the voltage value is equal to 0, then determining that the battery explosion-proof valve is in a working state.

[0048] The method further includes: using the vehicle controller in the detection system to perform the following steps: obtaining the working status of the battery explosion-proof valve sent by the battery management system; when the working status information of the battery explosion-proof valve is received as not working, sending a high-voltage power-on command to the battery management system; when the working status information of the battery explosion-proof valve is received as working, sending a high-voltage power-on prohibition command to the battery management system and issuing a battery status warning.

[0049] It should be noted that the methods provided in the above embodiments and the system embodiments above belong to the same concept, and their specific implementation process can be found in the system embodiments, which will not be repeated here.

[0050] This application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements the above-described detection method.

[0051] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described detection method.

[0052] The technical features described above can be combined arbitrarily. Although not all possible combinations of these technical features are described, any combination of these technical features should be considered to be covered by this specification, provided that such combination does not contain contradictions.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A detection system for battery explosion-proof valves, characterized in that, The detection system includes a power supply and a battery explosion-proof valve; the battery explosion-proof valve includes a valve body and a valve disc, one end of the power supply is connected to the valve disc of the battery explosion-proof valve, and the other end of the power supply is connected to the valve body of the battery explosion-proof valve.

2. The detection system according to claim 1, characterized in that, The detection system further includes a first resistor, which is disposed in a first line between one end of the power supply and the valve disc of the battery explosion-proof valve. Alternatively, the first resistor may be disposed in a second line between the other end of the power supply and the valve body of the battery explosion-proof valve.

3. The detection system according to claim 2, characterized in that, The power supply is a DC power supply with a voltage between 5mV and 10mV, and the resistance of the first resistor is between 50Ω and 100Ω.

4. The detection system according to claim 2, characterized in that, The detection system also includes a unidirectional diode; the unidirectional diode is disposed in the first line or the second line.

5. The detection system according to claim 1, characterized in that, The battery explosion-proof valve is located near the battery and is isolated from other components of the battery by insulating material.

6. The detection system according to claim 1, characterized in that, The detection system also includes a battery management system, which is connected to a first or second line between the power supply and the battery explosion-proof valve via a sampling node. The battery management system is configured to collect current or voltage values ​​at the sampling node and determine the state of the battery explosion-proof valve based on the current or voltage values.

7. The detection system according to claim 6, characterized in that, The battery management system is configured to: determine that the battery explosion-proof valve is in a non-working state if the current value or the voltage value is greater than 0; and determine that the battery explosion-proof valve is in a working state if the current value or the voltage value is equal to 0.

8. The detection system according to claim 6, characterized in that, The detection system also includes a vehicle controller, which is connected to the battery management system. The battery management system is configured to send the operating status of the battery explosion-proof valve to the vehicle controller. The vehicle controller is configured to determine whether to send a high-voltage power-on command or not to send a high-voltage power-on command to the battery management system and whether to issue a warning based on the operating status of the battery explosion-proof valve.

9. The detection system according to claim 8, characterized in that, The vehicle controller is configured to: send a high-voltage power-on command to the battery management system when the battery explosion-proof valve is in a non-operating state; and send a high-voltage power-on prohibition command and provide a battery status warning to the battery management system when the battery explosion-proof valve is in an operating state.

10. A vehicle, characterized in that, The vehicle includes a detection system according to any one of claims 1-9.

11. A testing method for battery explosion-proof valves, characterized in that, The method, applied to the detection system according to any one of claims 1-9, comprises: Connect one end of the power supply to the valve disc of the battery explosion-proof valve; Connect the other end of the power supply to the valve body of the battery explosion-proof valve.

12. The detection method according to claim 11, characterized in that, The method further includes: performing the following steps using the battery management system of the detection system: The sampling node is connected to either the first or second line between the power supply and the battery explosion-proof valve. The current or voltage value at the sampling node is collected, and the state of the battery explosion-proof valve is determined based on the current or voltage value.

13. The detection method according to claim 12, characterized in that, The method further includes: performing the following steps using the battery management system of the detection system: Sample the current or voltage value in the circuit between the power supply and the battery explosion-proof valve; If the current value or the voltage value is greater than 0, then the battery explosion-proof valve is determined to be in a non-working state. If the current value or the voltage value is equal to 0, then the battery explosion-proof valve is determined to be in working condition.

14. The detection method according to any one of claims 11 to 13, characterized in that, The method further includes: performing the following steps using the vehicle controller in the detection system: Obtain the operating status of the battery explosion-proof valve sent by the battery management system; When the battery explosion-proof valve is received as not in operation, a high-voltage power-on command is sent to the battery management system; when the battery explosion-proof valve is received as in operation, a high-voltage power-on command is sent to the battery management system and a battery status warning is issued.

15. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the detection method according to any one of claims 11-14.

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