Thermal runaway detection methods, media, equipment and products

Abstract

The present application discloses a thermal runaway detection method, medium, equipment and product, wherein the method includes: determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located and the resistance data of the battery cell to the ground; when the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition, confirming that the battery system where the battery cell is located has thermal runaway. The present application determines whether the battery cell meets each thermal runaway condition through the temperature and voltage data, communication data and resistance data of the battery cell, and can detect the state of the battery system where the battery cell is located from multiple angles; by determining that the battery system has thermal runaway when the battery cell meets any two thermal runaway conditions, the detection efficiency and accuracy of thermal runaway are improved, and the safety of vehicle use is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a thermal runaway detection method, medium, equipment and product. Background Art

[0002] As the energy and environmental problems caused by fuel vehicles become more and more prominent, new energy vehicles have begun to be vigorously developed. In new energy vehicles, batteries, as the energy source of the entire vehicle, occupy a very important position. However, batteries may experience thermal runaway, which will pose a safety hazard to the use of the vehicle.

[0003] Therefore, how to accurately detect thermal runaway of batteries has become a technical problem that needs to be urgently solved in the industry. Summary of the invention

[0004] The present application provides a thermal runaway detection method, medium, device and product to solve the technical problem of how to accurately detect thermal runaway of a battery in the prior art.

[0005] In a first aspect, the present application provides a thermal runaway detection method, comprising:

[0006] Determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located, and the resistance data of the battery cell to ground;

[0007] When the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition, it is confirmed that thermal runaway exists in the battery system where the battery cell is located.

[0008] In a second aspect, the present application provides a thermal runaway detection device, comprising:

[0009] A determination module, used to determine whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition respectively based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located and the resistance data of the battery cell to ground;

[0010] The monitoring module is used to confirm that the battery system where the battery cell is located has thermal runaway when the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition.

[0011] In a third aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above method when executed by a processor.

[0012] In a fourth aspect, the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to implement the above method when executing the program through the computer program.

[0013] In a fifth aspect, the present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0014] The thermal runaway detection method, medium, equipment and product provided in the present application can respectively determine whether a battery cell meets the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition through the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located and the resistance data of the battery cell to ground, and can detect the state of the battery system where the battery cell is located from multiple angles; by determining that the battery system has thermal runaway when the battery cell meets any two thermal runaway conditions, the detection efficiency and accuracy of thermal runaway can be improved, so that relevant measures can be taken in time to prevent accidents, thereby improving the safety of vehicle use.

[0015] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 One of the flow charts of the thermal runaway detection method provided in the embodiment of the present application;

[0018] Figure 2 A second flow chart of the thermal runaway detection method provided in an embodiment of the present application;

[0019] Figure 3 A third flow chart of the thermal runaway detection method provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the structure of a thermal runaway detection device provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0023] The thermal runaway detection method provided in the embodiment of the present application is applicable to a terminal, which may be various electronic devices equipped with a battery management system (BMS), including but not limited to servers, smart phones, tablet computers, laptop computers, and desktop computers.

[0024] Figure 1 One of the flow diagrams of the thermal runaway detection method provided in the embodiment of the present application is as follows: Figure 1 As shown, the method includes step 110 and step 120. The steps of the method flow are only a possible implementation of the present application.

[0025] Step 110: determine whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located, and the resistance data of the battery cell to ground.

[0026] Specifically, the executor of the thermal runaway detection method provided in the embodiment of the present application is a thermal runaway detection device, which can be a hardware device independently provided in the battery management system of the terminal, or a software program running in the battery management system.

[0027] Thermal runaway refers to the phenomenon that during the operation of a battery system, the temperature of the battery cells continues to rise due to internal or external factors, eventually triggering a series of chemical reactions and physical changes, causing the battery system to lose control and possibly leading to a safety accident.

[0028] The temperature and voltage data of the battery cell refers to the temperature and / or voltage information generated by the battery cell during use. These data are important bases for evaluating the battery status and predicting the risk of thermal runaway. Temperature sensors and voltage sensors can be installed on the battery cell to monitor and record these data in real time. The temperature sensor is used to measure the surface temperature of the battery cell; the voltage sensor is used to measure the operating voltage of the battery cell.

[0029] The communication data of the line where the battery cell is located involves information exchange within the battery management system and between external devices. These data include key parameters such as the battery's charge and discharge status, power, temperature and voltage. When a fault occurs in the line where the battery cell is located, such as a short circuit, the transmitted communication data may be erroneous data, which will affect the data detection of the battery cell. The communication module and network interface inside the battery management system exchange data with other vehicle systems (such as motor controllers, charging systems, etc.) to achieve real-time sharing and monitoring of battery status. At the same time, the battery management system can also upload the collected data to the cloud or remote monitoring system for more comprehensive analysis and processing.

[0030] The resistance data of the battery cell to the ground refers to the insulation resistance value between the positive and negative poles of the battery cell and the ground (or vehicle chassis). This resistance value reflects the insulation performance of the battery system, that is, the ability of the battery system to prevent current from leaking to the ground. A high insulation resistance value indicates that the battery system has good insulation performance, while a low insulation resistance value may mean that there is a risk of leakage or short circuit. This resistance data can be measured by an insulation resistance tester or a megohmmeter. When measuring, connect one end of the tester to the positive or negative pole of the battery cell and the other end to the ground or vehicle chassis, and then read the resistance value displayed by the tester. This value is the insulation resistance value of the battery cell to the ground.

[0031] The first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition are three important criteria for determining whether the battery system in which the battery cell is located is at a potential thermal runaway risk. The following is a brief definition of these three conditions:

[0032] The first thermal runaway condition involves relevant threshold data of the battery cell temperature and / or voltage.

[0033] For example, the first thermal runaway condition may include a temperature threshold. When the temperature of the battery cell is greater than the temperature threshold, it can be considered that the current battery cell meets the first thermal runaway condition. When the battery cell temperature and / or voltage is abnormal, it may indicate that the battery is experiencing a thermal runaway process. Therefore, temperature and voltage data can be used as a condition for judging thermal runaway.

[0034] The second thermal runaway condition involves a communication failure related to the circuit where the battery cell is located.

[0035] For example, when a fault is detected in the communication line related to the battery cell, such as signal interruption or data transmission error, the current battery cell can be considered to meet the second thermal runaway condition. When a communication failure occurs, it may result in the inability to accurately obtain the current state information of the battery cell, thereby increasing the risk of thermal runaway. Therefore, communication data can be used as a condition for judging thermal runaway.

[0036] The third thermal runaway condition involves relevant threshold data of the insulation resistance value of the battery cell to ground.

[0037] The insulation resistance value reflects the insulation performance of the battery system, that is, the ability of the battery to prevent current from leaking to the ground. When the insulation resistance value drops to a certain value, it may mean that the battery system is at risk of leakage or short circuit, which will also increase the possibility of thermal runaway. Therefore, resistance data can also be used as an important condition for judging thermal runaway.

[0038] The cell data can be obtained, including the temperature and voltage data of the cell, the communication data of the line where the cell is located, and the resistance data of the cell to the ground, and then it can be determined whether the cell meets each thermal runaway condition.

[0039] Step 120: When the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition, confirm that thermal runaway exists in the battery system where the battery cell is located.

[0040] Specifically, a single condition may not be able to accurately determine whether the battery system is in thermal runaway, but too many conditions will reduce the detection efficiency. Therefore, this application divides the thermal runaway conditions into three types according to the type of battery cell data. When the battery cell data meets any two different thermal runaway conditions, it is confirmed that the battery system where the battery cell is located has thermal runaway.

[0041] For example, if the cell data of a cell meets the first thermal runaway condition and the second thermal runaway condition, it can be considered that the battery system where the cell is located has thermal runaway.

[0042] The thermal runaway detection method provided in the embodiment of the present application determines whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition respectively through the temperature and voltage data of the battery cell, the communication data of the line where the battery cell is located and the resistance data of the battery cell to the ground. The state of the battery system where the battery cell is located can be detected from multiple angles; by determining that the battery system has thermal runaway when the battery cell meets any two thermal runaway conditions, the detection efficiency and accuracy of thermal runaway can be improved, so that relevant measures can be taken in time to prevent accidents, thereby improving the safety of vehicle use.

[0043] It should be noted that each implementation method of the present application can be freely combined, the order can be changed, or it can be executed separately, and does not need to rely on or depend on a fixed execution order.

[0044] In some embodiments, determining whether the battery cell meets the first thermal runaway condition based on the temperature and voltage data includes:

[0045] When the highest temperature of the battery cell in the current detection cycle is greater than a first threshold value and lasts for a first time period, determining that the battery cell meets the first thermal runaway condition; and / or,

[0046] When the temperature rise rate of the battery cell in the current detection cycle is greater than a second threshold and lasts for a second period of time, determining that the battery cell meets the first thermal runaway condition; and / or,

[0047] When the difference between the highest temperature and the lowest temperature of the battery cell in the current detection cycle is greater than a third threshold, and the difference between the highest temperature and the average temperature is greater than a fourth threshold, and continues for a third period of time, it is determined that the battery cell meets the first thermal runaway condition; and / or,

[0048] When the voltage drop ratio of the battery cell in the current detection cycle is greater than a fifth threshold value and lasts for a fourth time period, determining that the battery cell meets the first thermal runaway condition; and / or,

[0049] When the voltage of the battery cell is less than a sixth threshold value and lasts for a fifth time period in the current detection cycle, it is determined that the battery cell meets the first thermal runaway condition.

[0050] Specifically, the detection cycle can be set according to actual conditions, and it is determined whether the temperature and voltage data of the battery cell in each detection cycle meet the first thermal runaway condition. The detection cycle can be set according to actual scenarios, for example, it can be set to 2 minutes.

[0051] The first thermal runaway condition may include A, B, C, D and / or E, which will be described in detail below.

[0052] A: The highest temperature of the battery cell in the current detection cycle is greater than the first threshold and lasts for the first duration. The first threshold is a temperature threshold, and both the first threshold and the first duration can be set according to relevant historical data of the battery cell.

[0053] For example, the first threshold is set to 65° C., and the first duration is set to 0.5 s. Then A means that the maximum temperature of the battery cell in the current detection cycle is greater than 65° C. and lasts for 0.5 s.

[0054] B: The temperature rise rate of the battery cell in the current detection cycle is greater than the second threshold and lasts for the second time period. The second threshold is the temperature rise rate threshold, and both the second threshold and the second time period can be set according to the relevant historical data of the battery cell.

[0055] For example, the second threshold is set to 1°C / s, and the second time duration is set to 3s. Then B means that the temperature rise rate of the battery cell in the current detection cycle is greater than 1°C / s and lasts for 3s.

[0056] C: The difference between the highest temperature and the lowest temperature of the battery cell in the current detection cycle is greater than the third threshold, and the difference between the highest temperature and the average temperature is greater than the fourth threshold, and it lasts for a third time. The third threshold and the fourth threshold are both temperature difference thresholds, and the third threshold, the fourth threshold and the third time can be set according to the relevant historical data of the battery cell.

[0057] For example, the third threshold is set to 20°C, the fourth threshold is set to 10°C, and the third duration is set to 0.5s. Then C is the maximum temperature minus the minimum temperature greater than 20°C, the maximum temperature minus the average temperature greater than 10°C, and both last for 0.5s.

[0058] D: The voltage drop ratio of the battery cell in the current detection cycle is greater than the fifth threshold and lasts for the fourth duration. The fifth threshold is the voltage drop ratio threshold, and both the fifth threshold and the fourth duration can be set according to the relevant historical data of the battery cell.

[0059] For example, the fifth threshold is set to 25%, and the fourth time duration is set to 0.5s. Then D is the voltage drop value of the battery cell exceeding 25% and lasting for 0.5s.

[0060] E: The voltage of the battery cell in the current detection cycle is less than the sixth threshold value and lasts for the fifth duration. The sixth threshold value is a voltage threshold value, and both the sixth threshold value and the fifth duration can be set according to the relevant historical data of the battery cell.

[0061] For example, the sixth threshold is set to 1.5V, and the fifth time duration is set to 3s. Then E means that the voltage of the battery cell is less than 1.5V and lasts for 3s.

[0062] When the temperature and voltage data of any battery cell in the battery system meets A, B, C, D and / or E, it can be determined that the battery cell meets the first thermal runaway condition.

[0063] The thermal runaway detection method provided in the embodiment of the present application determines whether the battery cell meets the first thermal runaway condition through the temperature data and / or voltage data of the battery cell. The first thermal runaway condition can be combined with other conditions to further detect whether the battery system where the battery cell is located has thermal runaway, thereby improving the accuracy of thermal runaway detection.

[0064] In some embodiments, determining whether the battery cell meets the second thermal runaway condition based on the communication data includes:

[0065] When communication data of a collection circuit for collecting the temperature and voltage data is abnormal and lasts for a sixth period of time, determining that the battery cell meets the second thermal runaway condition; and / or

[0066] When the communication data of the communication link of the battery cell is abnormal and lasts for a seventh period of time, it is determined that the battery cell meets the second thermal runaway condition.

[0067] Specifically, the second thermal runaway condition may include F and / or G, which will be described in detail below.

[0068] F: The communication data of the acquisition line for collecting temperature and voltage data is abnormal and lasts for the sixth time period. The sixth time period can be set according to the relevant historical data of the battery cell.

[0069] The acquisition line is a line for acquiring temperature and voltage data, and the communication data of the line includes temperature and voltage data.

[0070] When a short circuit or other fault occurs in the collection circuit for detecting the voltage and temperature data of the battery cell, the collected communication data will be abnormal, such as too large, too small, or no data, and will last for a period of time.

[0071] G: The communication data of the communication link of the battery cell is abnormal and continues for the seventh time period. The seventh time period can be set according to the relevant historical data of the battery cell.

[0072] When the communication link of the battery cell fails, such as a daisy chain communication failure, the communication data will be abnormal, such as no communication data, and it will last for a period of time. Daisy chain communication is an efficient and flexible communication method for battery management systems. It forms a ring structure by connecting multiple devices in series.

[0073] When the communication data of any battery cell in the battery system meets F and / or G, it can be determined that the battery cell meets the second thermal runaway condition.

[0074] The thermal runaway detection method provided in the embodiment of the present application can determine whether a related link of the battery cell has a fault through communication data, thereby improving the accuracy of thermal runaway detection.

[0075] In some embodiments, determining whether the battery cell meets the third thermal runaway condition based on the resistance data includes:

[0076] When the insulation resistance value of the positive electrode or the negative electrode of the battery cell to the ground is less than a seventh threshold value and lasts for an eighth time period, it is determined that the battery cell meets the third thermal runaway condition.

[0077] Specifically, the third thermal runaway condition may include H, which will be described in detail below.

[0078] H: The insulation resistance value of the positive or negative electrode of the battery cell to the ground is less than the seventh threshold and lasts for the eighth time period. The seventh threshold and the eighth time period can be set according to the relevant historical data of the battery cell.

[0079] For example, the seventh threshold is set to 500Ω / V, and the fifth time duration is set to 3s. Then the insulation resistance value of the positive electrode or negative electrode of the H battery cell to the ground is less than 500Ω / V and lasts for 3s.

[0080] When the insulation resistance value of the positive electrode or negative electrode to the ground of any battery cell in the battery system meets H, it can be determined that the battery cell meets the third thermal runaway condition.

[0081] The thermal runaway detection method provided in the embodiment of the present application can determine whether a battery cell has an abnormality through the resistance data of the battery cell to ground, thereby improving the accuracy of thermal runaway detection.

[0082] Figure 2 The second flow chart of the thermal runaway detection method provided in the embodiment of the present application is as follows: Figure 2 As shown, the above A, B, C, D and E belong to the judgment conditions of temperature and voltage type, which belong to the first thermal runaway condition; F and G belong to the judgment conditions of wiring harness type, which belong to the second thermal runaway condition; H belongs to the judgment condition of insulation fault type, which belongs to the third thermal runaway condition.

[0083] The temperature and voltage are collected by the acquisition unit. In order to avoid false alarms from the battery management system, the temperature and voltage are not combined as two conditions to report the thermal runaway warning fault. Therefore, the combination of the two conditions for judging the thermal runaway warning fault is as follows:

[0084] Combination of temperature-voltage class and wiring harness class conditions: (A, B, C, D, or E) and (F or G), combination of temperature-voltage class and insulation class: (A, B, C, D, or E) and H, or combination of wiring harness class and insulation class: (F or G) and H.

[0085] When the battery management system detects that the battery system where the battery cell is located has thermal runaway, it will immediately send out a thermal runaway alarm signal, such as an audible and visual alarm signal, to the entire vehicle. After the vehicle receives the thermal runaway alarm signal, it will immediately remind the user to evacuate.

[0086] After the vehicle receives a thermal runaway alarm signal, it can also control the thermal management system to start a liquid cooling cycle to cool the battery system.

[0087] In some embodiments, when it is confirmed that the battery cell meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, a fault alarm signal is generated; the fault alarm signal is automatically cleared after a preset time period.

[0088] Specifically, the fault alarm signal is a signal generated when the battery cell data meets any thermal runaway condition, which indicates that the battery cell data of the battery cell is abnormal, thereby ensuring that the battery management system can detect and handle potential faults in a timely manner.

[0089] The clearing time of the fault alarm signal, that is, the preset duration, can be set according to the actual situation. For example, the fault recovery clearing hysteresis time (that is, the preset duration) can be set to 180s, that is, the fault alarm signal will be automatically cleared after 180s of continuous alarm. The fault alarm signal can be cleared in real time without powering off.

[0090] The thermal runaway detection method provided in the embodiment of the present application ensures that the battery management system can promptly detect and handle potential faults through fault alarm signals, and can avoid false alarms or frequent state switching by setting a preset time length, thereby improving the reliability and stability of the system.

[0091] In some embodiments, the thermal runaway detection method is applied to a battery management system, wherein the battery management system includes a collection unit; before determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition, the method further includes:

[0092] When the battery management system is awakened, the acquisition unit acquires battery cell data in real time; the battery cell data includes the temperature and voltage data, the resistance data and the communication data;

[0093] When the battery management system is in a dormant state, the collection unit collects the battery cell data based on a preset collection frequency.

[0094] Specifically, the battery management system includes a collection unit, which includes three working modes: a normal working mode, a low power consumption mode, and a wake-up mode.

[0095] Normal working mode: After the battery management system is powered on (including being awakened), the acquisition unit can collect battery cell data in real time.

[0096] Low power consumption mode: This mode does not have the reverse wake-up function, it is just a normal sleep mode and will not monitor the battery cell data in the battery system.

[0097] Reverse wake-up mode: In the normal sleep mode of the battery management system, the battery cell data is periodically monitored. Once abnormal battery cell data is collected, the collection unit reversely wakes up the battery management system for further monitoring and judgment on whether the battery system has thermal runaway.

[0098] The acquisition unit has different acquisition frequencies for collecting cell data in the normal working mode and the reverse wake-up mode. In the normal working mode, the data is collected in real time; in the reverse wake-up mode, the data is collected periodically based on a preset acquisition frequency, and the preset acquisition frequency period can be set according to the actual situation. The acquisition frequency of the acquisition unit in the normal working mode is greater than the acquisition frequency in the reverse wake-up mode.

[0099] The thermal runaway detection method provided in the embodiment of the present application realizes continuous detection of battery cell data by collecting battery cell data in different scenarios, thereby realizing continuous detection of thermal runaway.

[0100] In some embodiments, when the battery management system is in the dormant state, the acquisition unit periodically wakes up the battery management system;

[0101] When the battery management system does not detect that the battery system is in thermal runaway, the dormant state is re-entered after the ninth time period.

[0102] Specifically, the battery management system has multiple working states, including a normal working state and a sleep state.

[0103] The battery management system is in normal working state during driving or charging. It will determine in real time whether the battery cell meets various thermal runaway conditions and issue a thermal runaway warning signal based on the combined conditions.

[0104] Figure 3 The third flow chart of the thermal runaway detection method provided in the embodiment of the present application is as follows: Figure 3 As shown, when the battery management system is in a dormant state, the thermal runaway of the battery system is detected through the following two mechanisms.

[0105] Real-time clock (RTC) timed wake-up: When the battery management system is in sleep mode, the acquisition unit periodically wakes up the battery management system, for example, once every 1 hour. After the battery management system is awakened, it monitors the thermal runaway of the battery system in accordance with normal working conditions. If the combined conditions for thermal runaway are met, the thermal runaway alarm is triggered; if thermal runaway is not detected, it re-enters the sleep state after the ninth time period, for example, after 1 minute.

[0106] In some embodiments, when the battery management system is in the dormant state and the cell data collected by the collection unit meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, the battery management system is awakened;

[0107] When the battery management system does not detect thermal runaway of the battery system, the dormant state is re-entered after the tenth time period.

[0108] Specifically, the acquisition unit reverse wakes up: when the battery management system is in sleep mode, if the acquisition unit detects that the cell data of any battery cell meets any thermal runaway condition, the battery management system will be reversely awakened. For example, if the battery cell temperature exceeds 65°C, the battery management system will be reversely awakened. After the battery management system is awakened, it detects the thermal runaway state of the battery system in accordance with normal working conditions. If the combined conditions for thermal runaway are met, the thermal runaway alarm is triggered; if thermal runaway is not detected, it will re-enter the sleep state after the tenth period of time, for example, it will enter sleep after 30 minutes.

[0109] The thermal runaway detection method provided in the embodiment of the present application improves the effectiveness of thermal runaway detection by timely detecting thermal runaway of the battery system in different scenarios.

[0110] It should be noted that the above-mentioned thresholds and preset durations are all set based on relevant historical data and actual scenarios.

[0111] The thermal runaway detection device provided in an embodiment of the present application is described below. The thermal runaway detection device described below and the thermal runaway detection method described above can refer to each other.

[0112] Figure 4 A schematic diagram of the structure of a thermal runaway detection device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the device includes a determination module 410 and a monitoring module 420 .

[0113] A determination module 410, configured to determine whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition, respectively, based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located, and the resistance data of the battery cell to ground;

[0114] The monitoring module 420 is used to confirm that the battery system where the battery cell is located has thermal runaway when the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition.

[0115] Specifically, according to an embodiment of the present application, any multiple modules in the determination module 410 and the monitoring module 420 can be combined into one module for implementation, or any one of the modules can be split into multiple modules.

[0116] Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of other modules and implemented in one module.

[0117] According to an embodiment of the present application, at least one of the determination module 410 and the monitoring module 420 can be at least partially implemented as a hardware circuit, such as a field programmable gate array, a programmable logic array, a system on a chip, a system on a substrate, a system on a package, an application-specific integrated circuit, or can be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation methods of software, hardware and firmware, or in an appropriate combination of any of them.

[0118] Alternatively, at least one of the determination module 410 and the monitoring module 420 may be at least partially implemented as a computer program module, and when the computer program module is executed, the corresponding function may be performed.

[0119] In some embodiments, the determination module 410 is specifically configured to:

[0120] When the highest temperature of the battery cell in the current detection cycle is greater than a first threshold value and lasts for a first time period, determining that the battery cell meets the first thermal runaway condition; and / or,

[0121] When the temperature rise rate of the battery cell in the current detection cycle is greater than a second threshold and lasts for a second period of time, determining that the battery cell meets the first thermal runaway condition; and / or,

[0122] When the difference between the highest temperature and the lowest temperature of the battery cell in the current detection cycle is greater than a third threshold, and the difference between the highest temperature and the average temperature is greater than a fourth threshold, and continues for a third period of time, it is determined that the battery cell meets the first thermal runaway condition; and / or,

[0123] When the voltage drop ratio of the battery cell in the current detection cycle is greater than a fifth threshold value and lasts for a fourth time period, determining that the battery cell meets the first thermal runaway condition; and / or,

[0124] When the voltage of the battery cell is less than a sixth threshold value and lasts for a fifth time period in the current detection cycle, it is determined that the battery cell meets the first thermal runaway condition.

[0125] In some embodiments, the determination module 410 is specifically configured to:

[0126] When communication data of a collection circuit for collecting the temperature and voltage data is abnormal and lasts for a sixth period of time, determining that the battery cell meets the second thermal runaway condition; and / or

[0127] When the communication data of the communication link of the battery cell is abnormal and lasts for a seventh period of time, it is determined that the battery cell meets the second thermal runaway condition.

[0128] In some embodiments, the determination module 410 is specifically configured to:

[0129] When the insulation resistance value of the positive electrode or the negative electrode of the battery cell to the ground is less than a seventh threshold value and lasts for an eighth time period, it is determined that the battery cell meets the third thermal runaway condition.

[0130] In some embodiments, when it is confirmed that the battery cell meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, a fault alarm signal is generated; the fault alarm signal is automatically cleared after a preset time period.

[0131] In some embodiments, the device further includes a collection unit, which is specifically used to:

[0132] When the battery management system is awakened, the acquisition unit acquires battery cell data in real time; the battery cell data includes the temperature and voltage data, the resistance data and the communication data;

[0133] When the battery management system is in a dormant state, the collection unit collects the battery cell data based on a preset collection frequency.

[0134] In some embodiments, when the battery management system is in the dormant state, the acquisition unit periodically wakes up the battery management system;

[0135] When the battery management system does not detect that the battery system is in thermal runaway, the dormant state is re-entered after the ninth time period.

[0136] In some embodiments, when the battery management system is in the dormant state and the cell data collected by the collection unit meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, the battery management system is awakened;

[0137] When the battery management system does not detect thermal runaway of the battery system, the dormant state is re-entered after the tenth time period.

[0138] It should be noted here that the thermal runaway detection device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned thermal runaway detection method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0139] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application, such as Figure 5 As shown, the electronic device may include: a processor (Processor) 510, a communication interface (Communications Interface) 520, a memory (Memory) 530 and a communication bus (Communications Bus) 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 may call the logic command in the memory 530 to execute the above method, which includes:

[0140] Determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located, and the resistance data of the battery cell to ground;

[0141] When the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition, it is confirmed that thermal runaway exists in the battery system where the battery cell is located.

[0142] In addition, the logic commands in the above-mentioned memory can be implemented in the form of software function modules and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several commands to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0143] The processor in the electronic device provided in the embodiment of the present application can call the logic instructions in the memory to implement the above method. Its specific implementation method is consistent with the implementation method of the aforementioned method and can achieve the same beneficial effects, which will not be repeated here.

[0144] An embodiment of the present application also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the methods provided in the above embodiments are implemented.

[0145] Its specific implementation is consistent with the aforementioned method implementation and can achieve the same beneficial effects, so it will not be repeated here.

[0146] An embodiment of the present application provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0147] The device embodiments described above are merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0148] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0149] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A thermal runaway detection method, characterized in that: include: Determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition, and the third thermal runaway condition based on the temperature and voltage data of the battery cell, the communication data of the circuit where the battery cell is located, and the resistance data of the battery cell to ground; When the battery cell meets at least two of the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition, it is confirmed that thermal runaway exists in the battery system where the battery cell is located.

2. The thermal runaway detection method according to claim 1, characterized in that: Determining whether the battery cell meets the first thermal runaway condition based on the temperature and voltage data includes: When the highest temperature of the battery cell in the current detection cycle is greater than a first threshold value and lasts for a first time period, determining that the battery cell meets the first thermal runaway condition; and / or, When the temperature rise rate of the battery cell in the current detection cycle is greater than a second threshold and lasts for a second period of time, determining that the battery cell meets the first thermal runaway condition; and / or, When the difference between the highest temperature and the lowest temperature of the battery cell in the current detection cycle is greater than a third threshold, and the difference between the highest temperature and the average temperature is greater than a fourth threshold, and continues for a third period of time, it is determined that the battery cell meets the first thermal runaway condition; and / or, When the voltage drop ratio of the battery cell in the current detection cycle is greater than a fifth threshold value and lasts for a fourth time period, determining that the battery cell meets the first thermal runaway condition; and / or, When the voltage of the battery cell is less than a sixth threshold value and lasts for a fifth time period in the current detection cycle, it is determined that the battery cell meets the first thermal runaway condition.

3. The thermal runaway detection method according to claim 1, characterized in that: Determining whether the battery cell meets the second thermal runaway condition based on the communication data includes: When communication data of a collection circuit for collecting the temperature and voltage data is abnormal and lasts for a sixth period of time, determining that the battery cell meets the second thermal runaway condition; and / or When the communication data of the communication link of the battery cell is abnormal and lasts for a seventh period of time, it is determined that the battery cell meets the second thermal runaway condition.

4. The thermal runaway detection method according to claim 1, characterized in that: Determining whether the battery cell meets the third thermal runaway condition based on the resistance data includes: When the insulation resistance value of the positive electrode or the negative electrode of the battery cell to the ground is less than a seventh threshold value and lasts for an eighth time period, it is determined that the battery cell meets the third thermal runaway condition.

5. The thermal runaway detection method according to claim 1, characterized in that: When it is confirmed that the battery cell meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, a fault alarm signal is generated; the fault alarm signal is automatically cleared after a preset time period.

6. The thermal runaway detection method according to any one of claims 1 to 5, characterized in that: Applied to a battery management system, the battery management system includes a collection unit; before determining whether the battery cell meets the first thermal runaway condition, the second thermal runaway condition and the third thermal runaway condition respectively, it also includes: When the battery management system is awakened, the acquisition unit acquires the battery cell data in real time; the battery cell data includes the temperature and voltage data, the resistance data and the communication data; When the battery management system is in a dormant state, the collection unit collects the battery cell data based on a preset collection frequency.

7. The thermal runaway detection method according to claim 6, characterized in that: When the battery management system is in the dormant state, the acquisition unit periodically wakes up the battery management system; When the battery management system does not detect thermal runaway of the battery system, the dormant state is re-entered after the ninth time period.

8. The thermal runaway detection method according to claim 6, characterized in that: When the battery management system is in the dormant state and the cell data collected by the collection unit meets the first thermal runaway condition, the second thermal runaway condition or the third thermal runaway condition, waking up the battery management system; When the battery management system does not detect thermal runaway of the battery system, the dormant state is re-entered after the tenth time period.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the thermal runaway detection method according to any one of claims 1 to 8 is implemented.

10. An electronic device comprising a memory and a processor, characterized in that: The memory stores a computer program, and the processor is configured to execute the thermal runaway detection method according to any one of claims 1 to 8 through the computer program.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the thermal runaway detection method according to any one of claims 1 to 8 is implemented.

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