Explosion-proof valve, battery thermal runaway detection method and device, electronic equipment and medium

Abstract

The embodiment of the present specification provides an explosion-proof valve, a battery thermal runaway detection method and device, electronic equipment and a medium. The explosion-proof valve comprises a to-be-detected member and a state detection interface. The opening and closing state of the explosion-proof valve is determined by using the measurable physical property of the material of the to-be-detected member on the explosion-proof valve, and the numerical value of the physical property is obtained. The opening and closing state of the explosion-proof valve can be fed back to the controller through the state detection interface, so that the controller can timely alarm when the battery thermal runaway. In the above process, the numerical value of the corresponding physical property of the material of the to-be-detected member on the explosion-proof valve changes due to the opening and closing state of the explosion-proof valve. Not only is real-time active monitoring not required, but also complex software algorithms are not involved, and the cost is low and easy to implement. At the same time, the opening and closing state of the explosion-proof valve can be detected in time, so that the detection of the battery thermal runaway is more accurate and reliable.

Description

Technical Field

[0001] This specification relates to the field of battery technology, and in particular to an explosion-proof valve, a battery thermal runaway detection method, device, electronic equipment, and medium. Background Technology

[0002] In recent years, thanks to the rapid development of battery technology, the pain points that once plagued electric vehicles have been solved one by one, such as battery size and capacity. In addition, electric vehicles have advantages such as energy saving, environmental friendliness, cost savings, and no driving restrictions, making them a popular choice for consumers, and sales continue to climb.

[0003] However, electric vehicles have certain safety hazards. When the batteries used in electric vehicles experience thermal runaway, they can generate a large amount of high-temperature gas in a short period of time, which can easily cause the batteries to catch fire or even explode, seriously threatening the safety of passengers and people around them.

[0004] Therefore, improving battery safety during use is one of the main research directions for major automakers. Summary of the Invention

[0005] In view of the above, this specification provides one or more embodiments of an explosion-proof valve, a battery thermal runaway detection method, device, electronic equipment, and medium to solve the problems existing in the related art.

[0006] To achieve the above objectives, one or more embodiments of this specification provide the following technical solutions:

[0007] According to a first aspect of the embodiments of this specification, an explosion-proof valve is provided, the explosion-proof valve being disposed on the battery casing, comprising:

[0008] The test piece, the material of which has measurable physical properties, and the opening and closing states of the explosion-proof valve correspond to the values ​​of different physical properties.

[0009] A status detection interface is used to connect to a controller so that the controller can determine the opening and closing status of the explosion-proof valve based on the value of the physical properties of the device under test, and perform battery thermal runaway detection based on the opening and closing status of the explosion-proof valve.

[0010] According to a second aspect of the embodiments of this specification, a battery thermal runaway detection method is provided, applied to a controller, the method comprising:

[0011] The physical properties of the component under test are obtained through the status detection interface of the explosion-proof valve connected to the controller; wherein, the material of the component under test has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to different values ​​of physical properties; the explosion-proof valve is located on the battery casing.

[0012] The opening and closing state of the explosion-proof valve is determined based on the obtained values ​​of the physical properties of the test component.

[0013] In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, a battery thermal runaway alarm is triggered.

[0014] According to a third aspect of the embodiments of this specification, a battery thermal runaway detection device is provided, applied to a controller, the device comprising:

[0015] The acquisition module acquires the values ​​of the physical properties of the component under test through the status detection interface of the explosion-proof valve connected to the controller; wherein, the material of the component under test has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to the values ​​of different physical properties.

[0016] The determination module determines the opening and closing state of the explosion-proof valve based on the obtained values ​​of the physical properties of the component to be tested.

[0017] The alarm module, in response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, will issue a battery thermal runaway alarm.

[0018] According to a fourth aspect of the embodiments of this specification, an electronic device is provided, including a communication interface, a processor, a memory, and a bus, wherein the communication interface, the processor, and the memory are interconnected via the bus;

[0019] The memory stores machine-readable instructions, and the processor executes the above method by invoking the machine-readable instructions.

[0020] According to a fifth aspect of the embodiments of this specification, a machine-readable storage medium is provided, the machine-readable storage medium storing machine-readable instructions, which, when invoked and executed by a processor, implement the above-described method.

[0021] The technical solutions provided in the embodiments of this specification may include the following beneficial effects:

[0022] The above technical solution utilizes the measurable physical properties of the material of the component under test on the explosion-proof valve. By acquiring the values ​​of these physical properties, the opening and closing state of the explosion-proof valve can be determined. This state can then be fed back to the controller via a status detection interface, allowing the controller to issue a timely alarm in the event of battery thermal runaway. In this process, the opening and closing state of the explosion-proof valve causes changes in the values ​​of the corresponding physical properties of the material under test on the valve. This eliminates the need for real-time active monitoring and complex software algorithms, and is low-cost and easy to implement. Furthermore, the timely detection of the explosion-proof valve's opening and closing state makes the detection of battery thermal runaway more accurate and reliable. Attached Figure Description

[0023] Figure 1 A schematic diagram of an explosion-proof valve provided for an exemplary embodiment of this specification;

[0024] Figure 2 A flowchart of a battery thermal runaway detection method provided as an exemplary embodiment of this specification;

[0025] Figure 3 A flowchart of a battery thermal runaway alarm provided as an exemplary embodiment of this specification;

[0026] Figure 4 A flowchart of yet another battery thermal runaway alarm provided as an exemplary embodiment of this specification;

[0027] Figure 5 A schematic diagram of the structure of an electronic device containing a battery thermal runaway detection device, provided as an exemplary embodiment of this specification;

[0028] Figure 6 This is a block diagram of a battery thermal runaway detection device provided for an exemplary embodiment of this specification. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0030] It should be noted that the steps of the corresponding methods are not necessarily performed in the order shown and described in this specification in other embodiments. In some other embodiments, the methods may include more or fewer steps than described in this specification. Furthermore, a single step described in this specification may be broken down into multiple steps in other embodiments; and multiple steps described in this specification may be combined into a single step in other embodiments.

[0031] Battery thermal runaway refers to a sharp increase in the rate of exothermic reactions between the positive and negative electrode materials and the electrolyte, as well as the rate of electrolyte decomposition reactions, leading to a corresponding rapid rise in the internal temperature of the battery, potentially causing spontaneous combustion or even an explosion. For example, when a battery is subjected to external impact and deforms, causing a short circuit between the positive and negative electrodes, high-temperature, high-pressure gas is generated. If this high-temperature, high-pressure gas cannot be dissipated in time, it may lead to battery thermal runaway.

[0032] In related technologies, an explosion-proof valve can be installed on the battery casing. When the gas pressure inside the battery exceeds the threshold of the explosion-proof valve, the valve opens to allow the gas inside the battery to be released quickly, thereby maintaining the gas pressure balance inside and outside the battery and preventing the battery from exploding.

[0033] In order to provide an immediate alarm when the battery experiences thermal runaway and improve safety during use, it is necessary to monitor the battery's thermal runaway state.

[0034] Currently, independent sensors can be installed inside the battery to actively monitor changes in the battery's internal state, such as using a pressure sensor to monitor changes in the internal air pressure.

[0035] However, introducing independent sensors not only requires a complete structural design but also increases costs. Furthermore, the real-time monitoring required by the sensors introduces power consumption issues. Additionally, the fluctuating internal environment of the battery leads to significant signal deviations from the sensors, posing a risk of false alarms and missed detections. Moreover, while the sensors perform active real-time monitoring, the detection results are somewhat delayed.

[0036] In view of this, this specification provides an explosion-proof valve, which utilizes the characteristic that the material of the test component under test has measurable physical properties, so that the opening and closing states of the explosion-proof valve correspond to different physical property values. Thus, the controller obtains the physical property values ​​through the state detection interface of the explosion-proof valve to determine the opening and closing state of the explosion-proof valve, and performs battery thermal runaway detection based on the opening and closing state of the explosion-proof valve.

[0037] The explosion-proof valve described in this manual will be explained in detail below with reference to the accompanying drawings.

[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of an explosion-proof valve provided for an exemplary embodiment of this specification. Figure 1 As shown, the explosion-proof valve is located on the battery casing, and the explosion-proof valve includes a component to be tested and a status detection interface.

[0039] In this specification, the material of the test piece may have measurable physical properties, and the opening and closing states of the explosion-proof valve correspond to the values ​​of different physical properties.

[0040] For example, when the explosion-proof valve is in the open and closed states respectively, the physical properties of the material of the above-mentioned test piece correspond to different values.

[0041] In one embodiment shown, the component to be tested is integrated into the vent of the explosion-proof valve, and when the vent deforms, the value of the physical property of the component to be tested changes accordingly.

[0042] The venting element of the aforementioned explosion-proof valve is designed to deform under the influence of gas pressure when the gas pressure inside the battery exceeds the threshold of the explosion-proof valve, thereby venting the gas inside the battery. For example, when high-pressure gas is generated inside the battery, the venting membrane, which serves as the venting element, is passively ruptured, and the gap after rupture becomes the outlet for the gas inside the battery to be discharged.

[0043] In one example, the component to be tested can be integrated by covering the breathable membrane and adhering to it. When the breathable membrane deforms, the component to be tested can also deform, and when the breathable membrane ruptures, the component to be tested can also fail. During the deformation process, the values ​​of the physical properties of the material of the component to be tested also change accordingly.

[0044] In one embodiment shown, the component to be tested is the vent of the explosion-proof valve, and the vent itself is made of a material with measurable physical properties.

[0045] In another example, the venting component of the explosion-proof valve can be used as the test component. By using a material with measurable physical properties for the venting component, the numerical change of the corresponding physical properties can be measured when the venting component undergoes deformation.

[0046] In the above process, whether the component to be tested is integrated into the venting component or the venting component itself is used as the component to be tested, no complex modifications are made to the explosion-proof valve, no new parts are added, and no sensors are used, greatly saving costs. Furthermore, since the venting component will deform when the opening and closing state of the explosion-proof valve changes, the opening and closing state of the explosion-proof valve can be accurately monitored in real time by measuring the changes in the physical properties of the component to be tested.

[0047] In this specification, the aforementioned state detection interface is used to connect to a controller so that the controller determines the opening and closing state of the explosion-proof valve based on the value of the physical properties of the device under test, and performs battery thermal runaway detection based on the opening and closing state of the explosion-proof valve.

[0048] For example, the controller can obtain the physical property values ​​of the component to be tested through the status detection interface of the explosion-proof valve, and then determine the opening and closing status of the explosion-proof valve based on the changes in the values. Furthermore, when the controller determines that the explosion-proof valve is in the open state and the duration of the open state is greater than a threshold, a battery thermal runaway alarm can be triggered.

[0049] In one embodiment shown, the state detection interface is located inside the battery; correspondingly, the state detection interface is connected to the battery's controller; or, the state detection interface is located outside the battery; correspondingly, the state detection interface is connected to the vehicle's controller.

[0050] It is worth noting that the aforementioned controller can be either a battery controller or a vehicle controller.

[0051] In one example, the state detection interface can be located inside the battery. In this case, the state detection interface can be connected to the battery controller, which will then perform battery thermal runaway detection.

[0052] In another example, the state detection interface can be located on the outside of the battery. In this case, the state detection interface can be connected to the vehicle's controller, which will then perform battery thermal runaway detection.

[0053] Because the aforementioned state detection interface can be connected to a variety of controllers, it can be flexibly adapted to different electric vehicle systems and meet different control requirements. For example, some vehicles require thermal runaway detection to be performed by the battery management system inside the battery, while other vehicles require thermal runaway detection to be performed by the vehicle's own vehicle controller or domain controller.

[0054] In one embodiment shown, the material includes a conductive material, a resistive material, or a capacitive material; correspondingly, the physical properties of the material include conductivity, resistance, or capacitance.

[0055] In one example, the material of the test piece can be a conductive material, such as a metal wire, and correspondingly, the measurable physical property of the test piece can be conductivity.

[0056] The aforementioned metal wire can be attached to the vent membrane of the explosion-proof valve. When the vent membrane is squeezed and deformed by the high-pressure gas inside the battery and breaks, the metal wire also breaks. The circuit where the metal wire is located changes from the original closed circuit state to the open circuit state, and the value of the physical property of the material to be tested becomes 0.

[0057] Furthermore, the controller can determine the on / off state of the circuit through the pins located at both ends of the metal wire via the status detection interface. When the circuit is in the on state, the breathable membrane is intact and the explosion-proof valve is in the closed state. When the circuit is in the off state, the breathable membrane is ruptured and the explosion-proof valve is in the open state.

[0058] In yet another example, the material of the aforementioned test piece can be a resistive material, and correspondingly, the measurable physical property of the test piece can be its resistance value. When high-temperature, high-pressure gas is generated inside the battery, the resistive material is affected by the high temperature, and its resistance value increases.

[0059] Furthermore, the controller can determine the current resistance value through the pins located at both ends of the resistive material via the status detection interface. When the resistance value is lower than the preset threshold, the explosion-proof valve can be considered to be in a closed state, and when the resistance value is higher than the preset threshold, the explosion-proof valve can be considered to be in an open state.

[0060] In another example, the material of the aforementioned test piece can be a capacitor material, and correspondingly, the measurable physical property of the test piece can be the capacitance value. The capacitor material can be the breathable membrane itself. When the explosion-proof valve is closed, the breathable membrane is intact and acts as the dielectric in the capacitor. When the explosion-proof valve is open, the breathable membrane ruptures, and the capacitor can be considered to have no dielectric.

[0061] Furthermore, the controller can determine the capacitance value through the pins located at the two metal terminals of the capacitor via the status detection interface. Since the capacitance value is larger when there is a dielectric than when there is no dielectric, the explosion-proof valve can be considered to be in a closed state when the capacitance value is higher than the preset threshold, and in a closed state when the capacitance value is lower than the preset threshold.

[0062] In one embodiment shown, the explosion-proof valve further includes a temperature sensor; the temperature sensor is used to acquire the ambient temperature inside the battery and to send the temperature to the controller.

[0063] For example, a temperature sensor can be optionally installed on the explosion-proof valve to collect the ambient temperature inside the battery and send the collected temperature to the controller. Adding a temperature sensor can further aid in diagnosing and verifying the battery's thermal runaway state.

[0064] The battery thermal runaway detection method described in this manual will now be explained in detail with reference to the accompanying drawings.

[0065] Please see Figure 2 , Figure 2 This is a flowchart illustrating a battery thermal runaway detection method provided as an exemplary embodiment of this specification, applied to a controller. Figure 2As shown, it includes the following steps:

[0066] Step 201: Obtain the values ​​of the physical properties of the component under test through the status detection interface of the explosion-proof valve connected to the controller; wherein, the material of the component under test has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to the values ​​of different physical properties; the explosion-proof valve is located on the battery casing.

[0067] Step 202: Determine the opening and closing state of the explosion-proof valve based on the obtained values ​​of the physical properties of the component to be tested;

[0068] Step 203: In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, a battery thermal runaway alarm is triggered.

[0069] It is worth noting that the aforementioned controller can be either a battery controller or a vehicle controller.

[0070] In this embodiment, the physical properties of the component under test can be obtained through the status detection interface of the explosion-proof valve connected to the controller.

[0071] Among them, the material of the test piece has measurable physical properties, and the opening and closing states of the explosion-proof valve correspond to the values ​​of different physical properties.

[0072] For example, since the material of the test piece has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to different values ​​of the physical properties of the test piece, the controller determines the open and closed state of the explosion-proof valve by acquiring the values ​​of the physical properties.

[0073] It should be noted that the relevant description of the component to be tested can be found in the aforementioned description of the explosion-proof valve, and will not be repeated here.

[0074] In this embodiment, the opening and closing state of the explosion-proof valve can be determined based on the obtained values ​​of the physical properties of the component to be tested.

[0075] For example, the obtained physical property values ​​of the component to be tested can be compared with a preset threshold. When the value reaches the threshold, it can be determined that the explosion-proof valve is in the open state; when the value does not reach the threshold, it can be determined that the explosion-proof valve is in the closed state.

[0076] It should be noted that the description of the relationship between the physical properties of the above materials and the opening and closing state of the explosion-proof valve can be found in the aforementioned description of the explosion-proof valve, and will not be repeated here.

[0077] In this embodiment, a battery thermal runaway alarm can be triggered in response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold.

[0078] For example, to prevent false alarms, a duration threshold can be set. When the explosion-proof valve is in the open state and the duration of the open state exceeds the threshold, a battery thermal runaway alarm will be triggered. If the explosion-proof valve is not in the open state, or if the explosion-proof valve is in the open state but the duration of the open state is less than the threshold, then a battery thermal runaway alarm will not be triggered.

[0079] In one embodiment shown, the explosion-proof valve further includes a temperature sensor; the temperature sensor is used to acquire the ambient temperature inside the battery and to send the temperature to the controller;

[0080] Furthermore, the process of performing step 203 above is as follows: Figure 3 As shown, the following steps may be included:

[0081] Step 301: In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, determine the relationship between the temperature and a preset first threshold and a second threshold; wherein the first threshold is greater than the second threshold.

[0082] Step 302: If the temperature is greater than the first threshold, a battery thermal runaway alarm is triggered.

[0083] Step 303: If the temperature is less than the second threshold, an explosion-proof valve failure alarm is triggered.

[0084] As mentioned above, since high-temperature and high-pressure gases are usually generated when a battery experiences thermal runaway, a temperature sensor can be installed on the explosion-proof valve to determine the ambient temperature inside the battery, thus assisting in the detection of battery thermal runaway.

[0085] like Figure 3 As shown, when the explosion-proof valve is in the open state and the duration of the open state exceeds a threshold, the relationship between the temperature and the preset first and second thresholds can be further determined. If the temperature is greater than the first threshold, it can be determined that the explosion-proof valve opened due to the generation of high-temperature and high-pressure gas inside the battery, and a battery thermal runaway alarm can be triggered. However, if the temperature is less than the second threshold, it indicates that there is no high-temperature gas, and the explosion-proof valve is not in the open state and the duration of the open state exceeds the threshold due to battery thermal runaway. Instead, the explosion-proof valve itself has malfunctioned, such as due to external, mechanical, or other factors causing the explosion-proof valve to open unexpectedly without thermal runaway, requiring an explosion-proof valve failure alarm.

[0086] In another embodiment shown, the explosion-proof valve further includes a pressure sensor; the pressure sensor is used to acquire the pressure inside the battery and to send the pressure to the controller;

[0087] Furthermore, the process of performing step 203 above is as follows: Figure 4 As shown, the following steps may be included:

[0088] Step 401: In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, determine the relationship between the change in air pressure within a preset time period and preset third and fourth thresholds; wherein, the fourth threshold is greater than the third threshold.

[0089] Step 402: If the change in air pressure is greater than the fourth threshold, a battery thermal runaway alarm is triggered.

[0090] Step 403: If the change in air pressure is less than the third threshold, an explosion-proof valve failure alarm is triggered.

[0091] As mentioned above, since high-temperature and high-pressure gases are usually generated when a battery experiences thermal runaway, a pressure sensor can be installed on the explosion-proof valve to determine the gas pressure inside the battery, thus assisting in the detection of battery thermal runaway.

[0092] like Figure 4 As shown, when the explosion-proof valve is in the open state and the duration of the open state exceeds a threshold, the relationship between the gas pressure and the preset third and fourth thresholds can be further determined. If the gas pressure is greater than the fourth threshold, it can be determined that the explosion-proof valve opened due to the generation of high-temperature and high-pressure gas inside the battery, and a battery thermal runaway alarm can be triggered. However, if the gas pressure is less than the third threshold, it indicates that there is no high-temperature gas, and the explosion-proof valve is not in the open state and the duration of the open state exceeds the threshold due to battery thermal runaway. Instead, the explosion-proof valve itself has malfunctioned, such as due to external, mechanical, or other factors causing the explosion-proof valve to open unexpectedly without thermal runaway, requiring an explosion-proof valve failure alarm.

[0093] In another embodiment shown, during the execution of step 203 above, it can be determined whether one or more of the following conditions are met:

[0094] The cell voltage of the battery is less than a preset threshold.

[0095] The difference in temperature change of the battery reaches a preset threshold;

[0096] The battery temperature rise rate reaches a preset threshold;

[0097] The maximum temperature of the battery reaches a preset threshold.

[0098] If the conditions are met, a battery thermal runaway alarm will be triggered.

[0099] When a battery experiences thermal runaway, the cell voltage drops and a large amount of high-temperature, high-pressure gas is generated in a very short time. Therefore, the characteristics of thermal runaway can be used as a judgment condition. Furthermore, the combination of multiple conditions makes the judgment more reliable than the aforementioned auxiliary detection scheme based on a single condition.

[0100] The above technical solution utilizes the measurable physical properties of the material of the component under test on the explosion-proof valve. By acquiring the values ​​of these physical properties, the opening and closing state of the explosion-proof valve can be determined. This state can then be fed back to the controller via a status detection interface, allowing the controller to issue a timely alarm in the event of battery thermal runaway. In this process, the opening and closing state of the explosion-proof valve causes changes in the values ​​of the corresponding physical properties of the material under test on the valve. This eliminates the need for real-time active monitoring and complex software algorithms, and is low-cost and easy to implement. Furthermore, the timely detection of the explosion-proof valve's opening and closing state makes the detection of battery thermal runaway more accurate and reliable.

[0101] In an exemplary embodiment of this specification, an apparatus capable of implementing the above-described method is also provided.

[0102] Figure 5 This is a schematic structural diagram of a device provided in an exemplary embodiment. Please refer to... Figure 5 At the hardware level, the device includes a processor 502, an internal bus 504, a network interface 506, memory 508, and non-volatile memory 510, and may also include other hardware required for business operations. One or more embodiments of this specification can be implemented in software, such as the processor 502 reading the corresponding computer program from the non-volatile memory 510 into memory 509 and then running it. Of course, in addition to software implementation, one or more embodiments of this specification do not exclude other implementation methods, such as logic devices or a combination of hardware and software, etc. That is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0103] Please refer to Figure 6 In one software implementation, a battery thermal runaway detection device 600 is provided, applied to a controller. For example... Figure 6 As shown, the device 600 includes:

[0104] The acquisition module 601 acquires the values ​​of the physical properties of the component to be tested through the state detection interface of the explosion-proof valve connected to the controller; wherein, the material of the component to be tested has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to the values ​​of different physical properties.

[0105] The determining module 602 determines the opening and closing state of the explosion-proof valve based on the obtained values ​​of the physical properties of the component to be tested.

[0106] The alarm module 603, in response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, performs a battery thermal runaway alarm.

[0107] Optionally, the explosion-proof valve further includes a temperature sensor; the temperature sensor is used to collect the ambient temperature inside the battery and send the temperature to the controller;

[0108] The alarm module 603 further includes:

[0109] In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, the relationship between the temperature and a preset first threshold and a second threshold is determined; wherein the first threshold is greater than the second threshold.

[0110] If the temperature exceeds the first threshold, a battery thermal runaway alarm is triggered.

[0111] If the temperature is less than the second threshold, an explosion-proof valve failure alarm will be triggered.

[0112] Optionally, the explosion-proof valve further includes a pressure sensor; the pressure sensor is used to collect the air pressure inside the battery and send the air pressure to the controller;

[0113] The alarm module 603 further includes:

[0114] In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, the relationship between the change in air pressure within a preset time period and preset third and fourth thresholds is determined; wherein, the fourth threshold is greater than the third threshold.

[0115] If the change in air pressure is greater than the fourth threshold, a battery thermal runaway alarm will be triggered.

[0116] If the change in air pressure is less than the third threshold, an explosion-proof valve failure alarm will be triggered.

[0117] Optionally, the alarm module 603 further includes:

[0118] In response to the explosion-proof valve being in the open state, and the duration of the open state being greater than a threshold, it is determined whether one or more of the following conditions are met:

[0119] The cell voltage of the battery is less than a preset threshold.

[0120] The difference in temperature change of the battery reaches a preset threshold;

[0121] The battery temperature rise rate reaches a preset threshold;

[0122] The maximum temperature of the battery reaches a preset threshold.

[0123] If the conditions are met, a battery thermal runaway alarm will be triggered.

[0124] The specific implementation process of the functions and roles of each module in the above-mentioned device 600 can be found in the implementation process of the corresponding steps in the above-mentioned battery thermal runaway detection method. For relevant details, please refer to the description of the method implementation method. It will not be repeated here.

[0125] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the units or modules can be selected to achieve the purpose of the solution described in this specification, depending on actual needs. Those skilled in the art can understand and implement this without any inventive effort.

[0126] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, which can take the form of a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email sending and receiving device, game console, tablet computer, wearable device, or any combination of these devices.

[0127] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0128] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0129] Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0130] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0131] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0132] The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this specification. The singular forms “a,” “described,” and “the” used in one or more embodiments of this specification and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0133] It should be understood that although the terms first, second, third, etc., may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of one or more embodiments of this specification, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "in response to a determination," or "when," or "in the event of a determination."

[0134] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit the scope of one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the protection scope of one or more embodiments of this specification.

Claims

1. An explosion-proof valve, wherein the explosion-proof valve is disposed on the battery casing, comprising: The test piece, the material of which has measurable physical properties, and the opening and closing states of the explosion-proof valve correspond to the values ​​of different physical properties. The component to be tested is the venting component of the explosion-proof valve. When the venting component deforms, the values ​​of its physical properties change accordingly. The material of the breathable component includes resistive or capacitive materials, and correspondingly, the physical properties include resistance or capacitance values. A temperature sensor is used to collect the ambient temperature inside the battery and send the temperature to the controller; A status detection interface is used to connect to the controller so that the controller can determine the opening and closing status of the explosion-proof valve based on the value of the physical properties of the device under test, and perform battery thermal runaway detection based on the opening and closing status of the explosion-proof valve. In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, the relationship between the temperature and a preset first threshold and a second threshold is determined; wherein the first threshold is greater than the second threshold. If the temperature exceeds the first threshold, a battery thermal runaway alarm is triggered. If the temperature is less than the second threshold, an explosion-proof valve failure alarm will be triggered.

2. The explosion-proof valve according to claim 1, wherein the material comprises a conductive material; correspondingly, the physical properties of the material include conductivity.

3. The explosion-proof valve according to claim 1, wherein the explosion-proof valve further comprises a temperature sensor; the temperature sensor is used to collect the ambient temperature inside the battery and to send the temperature to the controller.

4. The explosion-proof valve according to claim 1, wherein the status detection interface is located inside the battery; correspondingly, the status detection interface is connected to the controller of the battery; or, The status detection interface is located on the outside of the battery; correspondingly, the status detection interface is connected to the vehicle's controller.

5. A battery thermal runaway detection method, applied to a controller, the method comprising: The physical property values ​​of the component under test are obtained through the state detection interface of the explosion-proof valve according to any one of claims 1-4, which is connected to the controller; wherein the material of the component under test has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to different physical property values; the explosion-proof valve is located on the battery casing. The opening and closing state of the explosion-proof valve is determined based on the obtained values ​​of the physical properties of the test component. In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, a battery thermal runaway alarm is triggered.

6. The method according to claim 5, wherein the explosion-proof valve further comprises a temperature sensor; the temperature sensor is used to collect the ambient temperature inside the battery and to send the temperature to the controller; The battery thermal runaway alarm is triggered in response to the explosion-proof valve being in the open state, and the duration of the open state being greater than a threshold, including: In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, the relationship between the temperature and a preset first threshold and a second threshold is determined; wherein the first threshold is greater than the second threshold. If the temperature exceeds the first threshold, a battery thermal runaway alarm is triggered. If the temperature is less than the second threshold, an explosion-proof valve failure alarm will be triggered.

7. The method according to claim 5, wherein the explosion-proof valve further comprises a pressure sensor; the pressure sensor is used to collect the pressure inside the battery and to send the pressure to the controller; The battery thermal runaway alarm is triggered in response to the explosion-proof valve being in the open state, and the duration of the open state being greater than a threshold, including: In response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, the relationship between the change in air pressure within a preset time period and preset third and fourth thresholds is determined; wherein, the fourth threshold is greater than the third threshold. If the change in air pressure is greater than the fourth threshold, a battery thermal runaway alarm will be triggered. If the change in air pressure is less than the third threshold, an explosion-proof valve failure alarm will be triggered.

8. The method according to claim 5, wherein the step of triggering a battery thermal runaway alarm in response to the explosion-proof valve being in an open state and the duration of the open state being greater than a threshold includes: In response to the explosion-proof valve being in the open state, and the duration of the open state being greater than a threshold, it is determined whether one or more of the following conditions are met: The cell voltage of the battery is less than a preset threshold. The difference in temperature change of the battery reaches a preset threshold; The battery temperature rise rate reaches a preset threshold; The maximum temperature of the battery reaches a preset threshold. If the conditions are met, a battery thermal runaway alarm will be triggered.

9. A battery thermal runaway detection device, applied to a controller, the device comprising: The acquisition module acquires the values ​​of the physical properties of the component under test through the state detection interface of the explosion-proof valve as described in any one of claims 1-4, which is connected to the controller; wherein the material of the component under test has measurable physical properties, and the open and closed states of the explosion-proof valve correspond to the values ​​of different physical properties. The determination module determines the opening and closing state of the explosion-proof valve based on the obtained values ​​of the physical properties of the component to be tested. The alarm module, in response to the explosion-proof valve being in the open state and the duration of the open state being greater than a threshold, will issue a battery thermal runaway alarm.

10. An electronic device, comprising: processor; Memory used to store processor-executable instructions; The processor implements the method as described in any one of claims 5-8 by executing the executable instructions.

11. A machine-readable storage medium having stored thereon machine-readable instructions that, when executed by a processor, implement the steps of the method as claimed in any one of claims 5-8.

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