Battery thermal runaway monitoring system and battery thermal runaway monitoring method

Abstract

The invention relates to a battery thermal runaway monitoring system and a battery thermal runaway monitoring method. The battery thermal runaway monitoring system comprises an information acquisition device and a data analysis system, the information acquisition device is positioned in the battery pack, is correspondingly connected with at least one battery and is used for acquiring battery information data of the at least one battery; the battery information data comprises characteristic gas concentration data released due to a battery fault, temperature data of a single battery cell, stress data in the single battery cell and working voltage data of the battery; and the data analysis system is connected with the information acquisition device and is used for receiving the battery information data transmitted by the information acquisition device and generating a battery control instruction according to the battery information data. According to the battery module, the integration level can be improved, in-situ monitoring of the single batteries can be achieved from multiple dimensions, the accuracy and timeliness of battery monitoring are improved, and thermal runaway is effectively prevented from being diffused in the battery module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery control, in particular to a battery thermal runaway monitoring system and a battery thermal runaway monitoring method. BACKGROUND

[0002] With the vigorous development of electrochemical energy storage power stations and electric vehicle industries, the application scale of lithium ion batteries continues to expand. However, there are two main risk factors in the large-scale production and use of lithium ion batteries: one is the internal defects that are difficult to completely avoid in the manufacturing process, and the other is the complex working conditions such as overcharge, overdischarge, overheating and mechanical stress that may be encountered in actual operation. The combined action of these internal and external factors may cause thermal runaway failure of lithium ion batteries, thereby causing safety accidents.

[0003] The battery monitoring system in the related art is usually a multi-sensor system with low integration, which has the problems of complex structure, large size and high cost. In addition, the battery monitoring system in the related art is designed for the whole battery pack and has single monitoring dimension, which is difficult to separately monitor single battery cells in multiple dimensions, and has the problems of untimely and inaccurate monitoring. SUMMARY

[0004] Based on this, the embodiments of the present application provide a battery thermal runaway monitoring system and a battery thermal runaway monitoring method, which can improve the integration while realizing in-situ monitoring of single batteries from multiple dimensions, improve the accuracy and timeliness of battery monitoring, and effectively avoid the spread of thermal runaway in the battery module.

[0005] In order to achieve the above purpose, on the one hand, some embodiments of the present application provide a battery thermal runaway monitoring system. The battery thermal runaway monitoring system comprises an information acquisition device and a data analysis system; the information acquisition device is located inside a battery pack and is connected with at least one battery, and is used for acquiring battery information data of the at least one battery; the battery information data comprises characteristic gas concentration data released due to battery failure, temperature data of single battery cells, stress data inside single battery cells and working voltage data of the battery; the data analysis system is connected with the information acquisition device, and is used for receiving the battery information data transmitted by the information acquisition device, and generating a battery control instruction according to the battery information data.

[0006] In some embodiments, the information collection device comprises a collection module, a control module and a data transmission module. The collection module is configured to obtain battery information sensing signals of the at least one battery; the battery information sensing signals comprise characteristic gas concentration signals, temperature signals of single battery cells, stress signals inside the single battery cells and working voltage signals of the battery; the control module is connected with the collection module and configured to determine the battery information data according to the battery information sensing signals; and the data transmission module is connected with the control module and the data analysis system and configured to send the battery information data to the data analysis system.

[0007] In some embodiments, the collection module comprises a gas concentration collection unit, a temperature collection unit, a stress collection unit and a voltage collection unit. The gas concentration collection unit is located near a gas release valve of a battery end cover and configured to obtain the characteristic gas concentration signals; the temperature collection unit is located on the battery end cover and configured to obtain the temperature signals of the single battery cells; the stress collection unit is located on the battery end cover and configured to obtain the stress signals inside the single battery cells; and the voltage collection unit is configured to obtain the working voltage signals of the battery.

[0008] In some embodiments, the gas concentration collection unit comprises at least one gas sensor and a power control circuit; the control module is further connected with the gas sensor and the power control circuit, and is further configured to control the power control circuit to feedback adjust the heating power of the gas sensor according to a power signal of the gas sensor and a preset power.

[0009] In some embodiments, the control module comprises a microcontroller unit and an interface circuit; the microcontroller unit is connected with the collection module and configured to receive the battery information sensing signals obtained by the collection module and convert the battery information sensing signals into the battery information data; and the interface circuit is connected with the data transmission module and the microcontroller unit and configured to send the battery information data to the data transmission module.

[0010] In some embodiments, the data analysis system comprises a wireless communication module and a data analysis module; the wireless communication module is configured to receive the battery information data from the information collection device; and the data analysis module is configured to receive the battery information data sent by the wireless communication module, aggregate and analyze the battery information data, and generate battery control instructions.

[0011] In some embodiments, the data analysis module is further configured to determine a warning level and generate a warning signal according to the battery information data and a preset threshold; and the battery thermal runaway monitoring system further comprises a warning module; the warning module is configured to perform thermal runaway warning when the warning signal is received.

[0012] In another aspect, the application also provides, according to some embodiments, a battery thermal runaway monitoring method, which can be executed based on the battery thermal runaway monitoring system described in some embodiments above.

[0013] In some embodiments, the battery thermal runaway monitoring method comprises the following steps.

[0014] Obtaining battery information data of at least one battery; the battery information data comprises characteristic gas concentration data released due to battery failure, temperature data of single battery cells, stress data inside the single battery cells, and working voltage data of the battery.

[0015] Generating battery control instructions according to the battery information data.

[0016] In some embodiments, the characteristic gas concentration data is determined based on a gas concentration acquisition unit; the gas concentration acquisition unit comprises at least one gas sensor and a power control circuit; the battery thermal runaway monitoring method further comprises the following steps.

[0017] Obtaining a heating voltage and a heating current of the gas sensor.

[0018] Determining a power signal of the gas sensor according to the heating voltage and the heating current.

[0019] Controlling the power control circuit to perform feedback adjustment on the heating power of the gas sensor according to the power signal and a preset power.

[0020] In some embodiments, after the step of obtaining the battery information data of at least one battery, the battery thermal runaway monitoring method further comprises the following steps.

[0021] Determining a warning level and generating a warning signal according to the battery information data and a preset threshold value.

[0022] The warning module performs thermal runaway warning when receiving the warning signal.

[0023] The embodiments of the application can have / at least have the following advantages:

[0024] In this embodiment, by placing the information acquisition device inside the battery pack and connecting it to at least one corresponding battery, independent monitoring of individual battery cells is achieved. The information acquisition device integrates multiple dimensions of information acquisition functions, effectively improving sensor integration and reducing device size, thus enabling in-situ monitoring of individual battery cells within the battery pack. Furthermore, by acquiring characteristic gas concentration data released due to battery failure, temperature data of individual battery cells, stress data within individual battery cells, and battery operating voltage data through the information acquisition device, information on individual battery cells can be collected from multiple dimensions. This allows for timely detection of individual battery cell failures, improving the accuracy and timeliness of battery monitoring and effectively preventing the spread of thermal runaway within the battery system. With the combined effect of these technical features, this application can achieve in-situ monitoring of individual battery cells from multiple dimensions while improving integration, thus enhancing the accuracy and timeliness of battery monitoring, effectively preventing the spread of thermal runaway within the battery module, and improving the reliability of the battery system.

[0025] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a structural block diagram of a battery thermal runaway monitoring system provided in some embodiments;

[0028] Figure 2 This is a connection diagram of a battery thermal runaway monitoring system provided in some embodiments;

[0029] Figure 3 This is a schematic diagram illustrating the connection between a gas concentration acquisition unit and a control module provided in some embodiments;

[0030] Figure 4 This is a structural block diagram of another battery thermal runaway monitoring system provided in some embodiments;

[0031] Figure 5 This is a structural block diagram of yet another battery thermal runaway monitoring system provided in some embodiments;

[0032] Figure 6 This is a structural block diagram of yet another battery thermal runaway monitoring system provided in some embodiments;

[0033] Figure 7 This is a flowchart illustrating a battery thermal runaway monitoring method provided in some embodiments;

[0034] Figure 8 This is a flowchart illustrating another battery thermal runaway monitoring method provided in some embodiments;

[0035] Figure 9 This is a flowchart illustrating yet another battery thermal runaway monitoring method provided in some embodiments.

[0036] Explanation of reference numerals in the attached figures:

[0037] A - Information acquisition device, 1 - Acquisition module, 11 - Gas concentration acquisition unit, 111 - Gas sensor, 112 - Power control circuit, S - Voltage source, O - Current acquisition subunit, R - Current feedback resistor, 12 - Temperature acquisition unit, 13 - Stress acquisition unit, 14 - Voltage acquisition unit, 2 - Control module, 21 - Microcontroller unit, 22 - Interface circuit, 3 - Data transmission module, B - Data analysis system, 4 - Wireless communication module, 5 - Data analysis module, 6 - Early warning module. Detailed Implementation

[0038] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate preferred embodiments of the application. However, this application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0040] It should be understood that when an element or layer is referred to as being "on," "adjacent to," or "connected to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, regions, layers, doping types, and / or portions, these elements, components, regions, layers, doping types, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, doping type, or portion from another element, component, region, layer, doping type, or portion. Therefore, without departing from the teachings of this application, the first element, component, region, layer, doping type, or portion discussed below may be referred to as a second element, component, region, layer, or portion.

[0041] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms “comprise” and / or “comprising” are used in this specification, the presence of the stated feature, integer, step, operation, element, and / or part is established, but the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups is not excluded. Meanwhile, when used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0042] Embodiments of the invention are described herein with reference to cross-sectional views illustrating preferred embodiments (and intermediate structures) of this application, thus allowing for the anticipation of variations in the illustrated shapes due to, for example, manufacturing techniques and / or tolerances. Embodiments of this application should not be limited to the specific shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing techniques. Therefore, the regions shown in the figures are substantially schematic, and their shapes do not represent the actual shapes of regions of the device, nor do they limit the scope of this application.

[0043] Based on this, the embodiments of this application provide a battery thermal runaway monitoring system and a battery thermal runaway monitoring method, which can improve the integration level and realize in-situ monitoring of individual cells from multiple dimensions, improve the accuracy and timeliness of battery monitoring, and effectively prevent thermal runaway from spreading within the battery module.

[0044] In some embodiments, please refer to Figure 1The battery thermal runaway monitoring system includes an information acquisition device A and a data analysis system B. The information acquisition device A is located inside the battery pack and is connected to at least one battery to acquire battery information data of at least one battery. The battery information data includes the concentration data of characteristic gases released due to battery failure, the temperature data of individual cells, the stress data inside individual cells, and the operating voltage data of the battery. The data analysis system B is connected to the information acquisition device A and is used to receive the battery information data transmitted by the information acquisition device A and generate battery control commands based on the battery information data.

[0045] For example, batteries include, but are not limited to, lithium-ion batteries.

[0046] It should be noted that the characteristic gases released due to battery failure refer to the various characteristic gases released by lithium-ion batteries during thermal runaway or failure, mainly including flammable gases, toxic gases, and electrolyte decomposition products. The composition and concentration of these gases are affected by factors such as battery materials, state of charge (SOC), and environmental pressure.

[0047] For example, the characteristic gases include, but are not limited to, hydrogen (H2), electrolyte vapor, carbon monoxide (CO), methane (CH4), hydrogen fluoride (HF), sulfur dioxide (SO2), or ethylene (C2H4).

[0048] In some examples, please refer to Figure 2 Information acquisition device A can be matched one-to-one with a single battery cell.

[0049] In this embodiment, by placing the information acquisition device A inside the battery pack and connecting it to at least one corresponding battery, independent monitoring of individual battery cells is achieved. The information acquisition device A integrates multiple dimensions of information acquisition functions, effectively improving sensor integration and reducing device size, thus enabling in-situ monitoring of individual battery cells within the battery pack. Furthermore, by acquiring characteristic gas concentration data released due to battery failure, temperature data of individual battery cells, stress data within individual battery cells, and battery operating voltage data through the information acquisition device A, information on individual battery cells can be collected from multiple dimensions. This allows for timely detection of individual battery cell failures, improving the accuracy and timeliness of battery monitoring and effectively preventing the spread of thermal runaway within the battery system. With the combined effect of these technical features, this application can achieve in-situ monitoring of individual battery cells from multiple dimensions while improving integration, thus enhancing the accuracy and timeliness of battery monitoring, effectively preventing the spread of thermal runaway within the battery module, and improving the reliability of the battery system.

[0050] In some embodiments, please continue reading Figure 1The information acquisition device A includes an acquisition module 1, a control module 2, and a data transmission module 3. The acquisition module 1 acquires battery information sensing signals from at least one battery; these signals include characteristic gas concentration signals, individual cell temperature signals, internal stress signals of individual cells, and the battery's operating voltage signal. The control module 2, connected to the acquisition module 1, determines battery information data based on the sensing signals. The data transmission module 3, connected to the control module 2 and the data analysis system B, sends the battery information data to the data analysis system B.

[0051] In some examples, the acquisition module 1 can be connected one-to-one with a single battery cell.

[0052] For example, the sampling frequency of the acquisition module 1 can range from 0.5Hz to 3Hz.

[0053] For example, the sampling frequency of the acquisition module 1 can be, for example, 0.5Hz, 1Hz, 1.5Hz, 2Hz, 2.5Hz or 3Hz.

[0054] In some embodiments, please continue reading Figure 1 The acquisition module 1 includes a gas concentration acquisition unit 11, a temperature acquisition unit 12, a stress acquisition unit 13, and a voltage acquisition unit 14. The gas concentration acquisition unit 11 is located near the vent valve on the battery end cap and is used to acquire characteristic gas concentration signals; the temperature acquisition unit 12 is located on the battery end cap and is used to acquire the temperature signal of a single battery cell; the stress acquisition unit 13 is located on the battery end cap and is used to acquire the stress signal inside a single battery cell; the voltage acquisition unit 14 is used to acquire the battery's operating voltage signal.

[0055] In some embodiments, please refer to Figure 3 The gas concentration acquisition unit 11 includes at least one gas sensor 111 and a power control circuit 112. The control module 2 is also connected to the gas sensor 111 and the power control circuit 112, and is also used to control the power control circuit 112 to adjust the heating power of the gas sensor 111 based on the power signal of the gas sensor 111 and the preset power.

[0056] For example, gas sensor 111 includes, but is not limited to, semiconductor gas sensors.

[0057] For example, the power control circuit 112 can be a constant power control circuit 112.

[0058] In some embodiments, please continue reading Figure 3 The power control circuit 112 includes a voltage source S, a current acquisition subunit O, and a current feedback resistor R.

[0059] For example, the current acquisition subunit O includes, but is not limited to, an operational amplifier.

[0060] For example, please continue reading Figure 3 The output terminal of the voltage source S is connected to the current feedback resistor R; the current feedback resistor R is connected to the heating terminal of the gas sensor 111; the two ends of the current feedback resistor R are also connected to the two input terminals of the current acquisition subunit O respectively; the output terminal of the voltage source S is also connected to the control module 2; the output terminal of the current acquisition subunit O is also connected to the control module 2.

[0061] In some examples, the power signal of the gas sensor 111 can be determined by the control module 2 based on the real-time collected heating voltage and heating current of the gas sensor 111.

[0062] In some examples, the voltage source S includes a feedback pin; the feedback pin of the voltage source S is connected to the control module 2. The control module 2 is also used to compare the power signal with a preset power and adjust the voltage output to the feedback pin of the voltage source S by the internal digital-to-analog converter according to the comparison result, thereby realizing feedback regulation of the heating power of the gas sensor 111.

[0063] In some embodiments, the gas sensor 111 includes a first gas sensor and a second gas sensor; wherein the first gas sensor is used to detect the gas concentration of hydrogen (H2), and the second gas sensor is used to detect the gas concentration of electrolyte vapor.

[0064] For example, the temperature acquisition unit 12 includes, but is not limited to, a surface-mount temperature sensor.

[0065] For example, the temperature acquisition unit 12 is in direct contact with and attached to the outer surface of the battery end cap.

[0066] For example, the stress acquisition unit 13 may include, but is not limited to, an integrated miniature pressure sensor; such as a thin-film strain gauge.

[0067] For example, the stress acquisition unit 13 is tightly fitted to the battery end cap.

[0068] For example, voltage acquisition unit 14 includes a voltage sampling circuit.

[0069] In some embodiments, please refer to Figure 4 The control module 2 includes a microcontroller unit 21 (MCU) and an interface circuit 22. The microcontroller unit 21 is connected to the acquisition module 1 and is used to receive the battery information sensing signal acquired by the acquisition module 1 and convert the battery information sensing signal into battery information data. The interface circuit 22 is connected to the data transmission module 3 and the microcontroller unit 21 and is used to send the battery information data to the data transmission module 3.

[0070] For example, the microcontroller unit 21 includes an analog-to-digital converter (A / D converter) and a digital-to-analog converter (D / A converter).

[0071] For example, interface circuit 22 includes, but is not limited to, an Inter-Integrated Circuit (IIC or I2C) bus. 2 C).

[0072] It should be noted that the gas concentration acquisition unit 11, temperature acquisition unit 12, stress acquisition unit 13, and voltage acquisition unit 14 in this embodiment can all perform continuous sampling and transmit the sampling results to the control module 2 in real time.

[0073] For example, the data transmission module 3 includes, but is not limited to, a wireless communication (WIFI) module and an antenna.

[0074] In some embodiments, please refer to Figure 5 The data analysis system B includes a wireless communication module 4 and a data analysis module 5. The wireless communication module 4 is used to receive battery information data from the information acquisition device A. The data analysis module 5 is used to receive the battery information data sent by the wireless communication module 4, and to summarize and analyze the battery information data to generate battery control commands.

[0075] For example, the wireless communication module 4 is also used to establish a UDP client based on the TCP / IP protocol, send data requests to the User Datagram Protocol (UDP) server established by the information collection device A, and receive battery information data returned by the information collection device A.

[0076] In some examples, there are multiple batteries and multiple information acquisition devices A, and each information acquisition device A is connected to a battery in a one-to-one correspondence; the data transmission process in the battery thermal runaway monitoring system includes the following steps.

[0077] S1. For target information acquisition device A, request a target thread corresponding to it in the thread pool.

[0078] S2. In the target thread, an information acquisition command is sent to the target information acquisition device A via a UDP socket, and the device waits for a response of battery information data; the timeout period is set to the first time threshold.

[0079] S3. Upon receiving battery information data, perform cyclic redundancy check. If the check result is correct, proceed to step S4. If the check result is incorrect or battery information data is not received after the waiting time exceeds the timeout period, proceed to step S5.

[0080] S4. Save the battery information data and end the thread, then proceed to step S6.

[0081] S5. Increment the count value by 1; if the current count value is less than 5, return to step S3; if the current count value is greater than or equal to 5, terminate the thread and execute step S6.

[0082] S6. Wait for all threads to return and set the timeout to the second time threshold.

[0083] It should be noted that when there are multiple batteries and multiple information collection devices A, each of the multiple information collection devices A needs to be treated as a target information collection device A, and the above steps S1 to S6 should be performed on it.

[0084] For example, the second time threshold is greater than the first time threshold.

[0085] For example, the first time threshold could be 1 second; the second threshold time could be 0.8 seconds.

[0086] In some embodiments, the data analysis module 5 is further configured to determine the warning level and generate a warning signal based on battery information data and a preset threshold; wherein, please refer to Figure 6 The battery thermal runaway monitoring system also includes an early warning module 6; the early warning module 6 is used to provide early warning of thermal runaway when an early warning signal is received.

[0087] For example, the early warning module 6 can be connected to the data analysis system B.

[0088] For example, preset thresholds include characteristic gas concentration thresholds, temperature thresholds, stress thresholds, and voltage thresholds.

[0089] For example, the specific process by which the data analysis module 5 determines the warning level and generates a warning signal based on battery information data and preset thresholds can be as follows: Each piece of data in the battery information data (including characteristic gas concentration data, temperature data, stress data, and operating voltage data) is compared with its corresponding preset threshold; for each piece of data exceeding its corresponding preset threshold, the warning level is incremented by 1. The data analysis module 5 is also used to display the current warning level and generate a warning signal.

[0090] This application also provides a battery thermal runaway monitoring method according to some embodiments, which can be executed based on the battery thermal runaway monitoring system described in the above embodiments. This battery thermal runaway monitoring method also possesses all the technical advantages of the aforementioned battery thermal runaway monitoring system. It should be noted that the parts that are the same as or corresponding to the above embodiments can be referred to the corresponding descriptions of the above embodiments, and will not be elaborated upon below.

[0091] In some embodiments, please refer to Figure 7 The battery thermal runaway monitoring method includes the following steps S710~S720.

[0092] S710, acquire battery information data of at least one battery; the battery information data includes characteristic gas concentration data released due to battery failure, temperature data of individual cells, stress data inside individual cells, and operating voltage data of the battery.

[0093] The S720 generates battery control commands based on battery information data.

[0094] For example, battery information data can be collected and acquired individually for each single battery cell.

[0095] In this embodiment, by acquiring characteristic gas concentration data released due to battery failure, temperature data of individual battery cells, stress data inside individual battery cells, and battery operating voltage data, information on individual batteries can be collected from multiple dimensions. This allows for timely detection of individual battery failures, improving the accuracy and timeliness of battery monitoring and effectively preventing the spread of thermal runaway within the battery system. Thus, in-situ monitoring of individual batteries from multiple dimensions is achieved, improving the accuracy and timeliness of battery monitoring and effectively preventing the spread of thermal runaway within the battery module, thereby enhancing the reliability of the battery system.

[0096] In some embodiments, the characteristic gas concentration data is determined based on a gas concentration acquisition unit; the gas concentration acquisition unit includes at least one gas sensor and a power control circuit; see [link to documentation]. Figure 8 The battery thermal runaway monitoring method also includes the following steps S810~S830.

[0097] S810 acquires the heating voltage and heating current of the gas sensor.

[0098] S820 determines the power signal of the gas sensor based on the heating voltage and heating current.

[0099] S830, based on the power signal and preset power, controls the power control circuit to adjust the heating power of the gas sensor according to feedback.

[0100] In some embodiments, please refer to Figure 9 After acquiring battery information data for at least one battery, the battery thermal runaway monitoring method further includes the following steps S910~S920.

[0101] The S910 determines the warning level and generates a warning signal based on battery information data and preset thresholds.

[0102] The S920 early warning module provides thermal runaway early warning upon receiving an early warning signal.

[0103] It should be understood that, although Figures 7-9 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 7-9 At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.

[0104] In the description of this specification, references to terms such as "some embodiments," "some examples," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application.

Claims

1. A battery thermal runaway monitoring system, characterized in that, include: An information acquisition device is located inside the battery pack and connected to at least one battery, for acquiring battery information data of the at least one battery; The battery information data includes the concentration data of characteristic gases released due to battery failure, the temperature data of individual cells, the stress data inside individual cells, and the operating voltage data of the battery. A data analysis system, connected to the information acquisition device, is used to receive the battery information data transmitted by the information acquisition device and generate battery control commands based on the battery information data.

2. The battery thermal runaway monitoring system according to claim 1, characterized in that, The information acquisition device includes: The acquisition module is used to acquire battery information sensing signals of the at least one battery; the battery information sensing signals include characteristic gas concentration signals, temperature signals of individual cells, stress signals inside individual cells, and operating voltage signals of the battery. The control module, connected to the acquisition module, is used to determine the battery information data based on the battery information sensing signal; The data transmission module, connected to the control module and the data analysis system, is used to send the battery information data to the data analysis system.

3. The battery thermal runaway monitoring system according to claim 2, characterized in that, The acquisition module includes: A gas concentration acquisition unit, located near the vent valve on the battery end cap, is used to acquire the concentration signal of the characteristic gas. A temperature acquisition unit, located on the battery end cap, is used to acquire the temperature signal of a single battery cell; A stress acquisition unit, located on the battery end cap, is used to acquire the stress signal inside a single battery cell; A voltage acquisition unit is used to acquire the operating voltage signal of the battery.

4. The battery thermal runaway monitoring system according to claim 3, characterized in that, The gas concentration acquisition unit includes at least one gas sensor and a power control circuit; the control module is also connected to the gas sensor and the power control circuit, and is also used to control the power control circuit to adjust the heating power of the gas sensor according to the power signal of the gas sensor and the preset power.

5. The battery thermal runaway monitoring system according to claim 2, characterized in that, The control module includes: A microcontroller unit, connected to the acquisition module, is used to receive the battery information sensing signal acquired by the acquisition module and convert the battery information sensing signal into battery information data; An interface circuit, connected to the data transmission module and the microcontroller unit, is used to send the battery information data to the data transmission module.

6. The battery thermal runaway monitoring system according to claim 1, characterized in that, The data analysis system includes: A wireless communication module is used to receive battery information data from the information acquisition device; The data analysis module is used to receive the battery information data sent by the wireless communication module, summarize and analyze the battery information data, and generate battery control commands.

7. The battery thermal runaway monitoring system according to claim 6, characterized in that, The data analysis module is also used to determine the warning level and generate a warning signal based on the battery information data and preset thresholds; The battery thermal runaway monitoring system also includes: The early warning module is used to provide early warning of thermal runaway upon receiving the early warning signal.

8. A method for monitoring battery thermal runaway, characterized in that, include: Obtain battery information data for at least one battery; the battery information data includes characteristic gas concentration data released due to battery failure, temperature data of individual battery cells, stress data inside individual battery cells, and operating voltage data of the battery; Battery control commands are generated based on the battery information data.

9. The battery thermal runaway monitoring method according to claim 8, characterized in that, The characteristic gas concentration data is determined based on a gas concentration acquisition unit; the gas concentration acquisition unit includes at least one gas sensor and a power control circuit; the battery thermal runaway monitoring method further includes: Obtain the heating voltage and heating current of the gas sensor; The power signal of the gas sensor is determined based on the heating voltage and the heating current. Based on the power signal and the preset power, the power control circuit is controlled to adjust the heating power of the gas sensor according to feedback.

10. The battery thermal runaway monitoring method according to claim 9, characterized in that, After acquiring battery information data for at least one battery, the battery thermal runaway monitoring method further includes: Based on the battery information data and preset thresholds, the warning level is determined and a warning signal is generated; The early warning module issues a thermal runaway warning upon receiving the warning signal.

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