Battery module thermal runaway early warning method and related device

Abstract

The invention belongs to the technical field of energy storage batteries, and discloses a battery module thermal runaway early warning method and a related device. The battery module thermal runaway early warning method comprises the following steps: based on a thin film pressure sensor arranged on a battery module to be subjected to thermal runaway early warning, obtaining an output voltage of the thin film pressure sensor; and based on the obtained output voltage of the thin film pressure sensor, carrying out battery module thermal runaway early warning according to the pre-obtained early warning grades. The invention discloses a technical scheme, and particularly relates to a battery module thermal runaway early warning scheme based on a thin film pressure sensor, which can solve the technical problems of insensitive thermal runaway early warning and incapability of early warning in the prior art, and can improve the operation safety and reliability of a battery energy storage system.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage batteries, and in particular relates to a battery module thermal runaway early warning method and related devices. Background Art

[0002] With the rapid development of renewable energy and the popularity of electric vehicles, the safety of battery energy storage systems has received more and more attention. Among them, batteries are the core components of battery energy storage systems. The safety and stability of batteries directly affect the safety and operational reliability of the entire battery energy storage system.

[0003] Batteries may face the risk of thermal runaway during use. Thermal runaway is usually caused by internal or external factors, such as mechanical damage to battery components, overcharging or discharging, design defects or abnormal usage conditions, which cause the internal chemical reaction of the battery to get out of control and the battery temperature to rise rapidly. This may cause the battery casing to rupture, electrolyte leakage, release of toxic gases, and even fire and explosion, posing a serious threat to people and the environment.

[0004] At present, the existing thermal runaway warning schemes mainly rely on the voltage, current, temperature and other state parameters of the battery management system, but these parameters are difficult to provide enough information, resulting in a high probability of false alarms and missed alarms in thermal runaway warnings; therefore, in order to detect and respond to potential safety risks in advance, there is an urgent need for a thermal runaway early warning scheme that is highly sensitive, real-time and accurate. Summary of the invention

[0005] The purpose of the present invention is to provide a battery module thermal runaway early warning method and related devices to solve one or more of the above-mentioned technical problems. The technical solution provided by the present invention is specifically a battery module thermal runaway early warning solution based on a thin film pressure sensor, which can solve the technical problems of the existing technology that the thermal runaway early warning is not sensitive and cannot be used for early warning, and can improve the safety and reliability of the battery energy storage system.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a battery module thermal runaway early warning method, comprising the following steps: Based on a thin film pressure sensor provided in a battery module to be warned of thermal runaway, an output voltage of the thin film pressure sensor is obtained; Based on the obtained output voltage of the thin film pressure sensor, a thermal runaway warning of the battery module is performed according to the pre-acquired warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; In both normal and fault states, the surface stress and surface temperature of the battery module under various working conditions are recorded respectively; based on the surface stress and surface temperature of the battery module under various working conditions, analysis and comparison are performed, and by comparing the differences between the surface stress and surface temperature in normal state and fault state, the graded warning range of pressure and temperature is determined; Based on the graded warning range of pressure and temperature, the warning grade of the output voltage of the thin film pressure sensor is determined by the binary function relationship.

[0007] A further improvement of the present invention is that in the step of obtaining the output voltage of the thin film pressure sensor based on the thin film pressure sensor provided in the battery module to be warned of thermal runaway, The thin film pressure sensor is arranged at the center of the battery module.

[0008] A further improvement of the present invention is that in the step of recording the output voltage of the thin film pressure sensor under different temperatures and pressures and fitting to obtain the binary function relationship between the output voltage of the thin film pressure sensor and the temperature and pressure, The binary function relationship includes the relationship between pressure and output voltage, and temperature is used as a correction term; Alternatively, the binary function relationship is the relationship between temperature and pressure as two independent variables and the output voltage.

[0009] A further improvement of the present invention is that in the step of recording the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states, Use pressure sensors and thermocouples to record the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states.

[0010] A further improvement of the present invention is that in the step of analyzing and comparing the surface stress and surface temperature of the battery module under various working conditions, and determining the graded warning range of pressure and temperature by comparing the difference between the surface stress and surface temperature in a normal state and a fault state, The graded warning range of pressure and temperature is expressed as, When T<T1 and P<P1, it is judged to be a normal operating state; When T1≤T<T2 or P1≤P<P2, it is judged as a first-level warning risky working state; When T>T2 or P>P2, it is judged as the second-level warning high-risk working state; Wherein, T represents the collected surface temperature; P represents the collected surface stress; T1 and T2 respectively represent the two temperature characteristic values ​​of the first thermal runaway battery cell in the selected battery module before the first valve spray; P1 and P2 respectively represent the two pressure characteristic values ​​of the first thermal runaway battery cell in the selected battery module before the first valve spray.

[0011] A further improvement of the present invention is that in the step of performing a thermal runaway warning of a battery module based on the output voltage of the thin film pressure sensor obtained and according to the pre-acquired warning classification, The warning signal is transmitted in the form of sound, light signal or network notification.

[0012] A further improvement of the present invention is that after the output voltage of the thin film pressure sensor is obtained and the thermal runaway warning of the battery module is performed according to the pre-acquired warning classification, the present invention further includes: Based on the battery module thermal runaway warning, measures are taken to reduce the charging rate of the battery pack, adjust the working status of the cooling system, or send alarm information to operation and maintenance personnel.

[0013] In a second aspect, the present invention provides a battery module thermal runaway warning system, comprising: A data acquisition module, configured to acquire an output voltage of a thin film pressure sensor provided in a battery module to be warned of thermal runaway based on the thin film pressure sensor; An early warning module, configured to provide a thermal runaway early warning for the battery module based on the obtained output voltage of the thin film pressure sensor and the pre-acquired early warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; In both normal and fault states, the surface stress and surface temperature of the battery module under various working conditions are recorded respectively; based on the surface stress and surface temperature of the battery module under various working conditions, analysis and comparison are performed, and by comparing the differences between the surface stress and surface temperature in normal state and fault state, the graded warning range of pressure and temperature is determined; Based on the graded warning range of pressure and temperature, the warning grade of the output voltage of the thin film pressure sensor is determined by the binary function relationship.

[0014] According to a third aspect of the present invention, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements a battery module thermal runaway warning method as described in any one of the first aspects of the present invention when executing the program.

[0015] According to a fourth aspect of the present invention, a non-transitory computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the battery module thermal runaway warning method as described in any one of the first aspects of the present invention is implemented.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The battery module thermal runaway early warning method based on a thin film pressure sensor disclosed in the present invention is an efficient and accurate battery management system technology, which aims to detect and warn possible thermal runaway risks in advance by real-time monitoring and analysis of the state parameters of the battery module, and can solve the technical problems of insensitivity and failure to provide early warning in the prior art, and can improve the safety and reliability of the battery energy storage system. Specifically, the present invention adopts a thin film pressure sensor coupled with surface stress and surface temperature, and fits the binary function relationship of its output voltage with respect to temperature and pressure; respectively, in the normal and fault states, the pressure and temperature changes of the battery module are measured, and based on the obtained binary function relationship of the output voltage with respect to temperature and pressure, the pressure and temperature graded warning range is determined by comparing the difference between the pressure and temperature changes between the normal state and the fault state, and the graded warning range of the pressure sensor output voltage is further determined by the binary function relationship. In specific applications, the output voltage of the thin film pressure sensor set in the battery module to be warned of thermal runaway is monitored, and when it reaches the corresponding level warning range, a corresponding warning signal is issued. The present invention simultaneously monitors the surface stress and temperature of the battery module through a thin film pressure sensor. Compared with single parameter monitoring, it can provide more comprehensive battery status information. This multi-parameter monitoring method helps to more accurately identify the thermal runaway risk of the battery module; in addition, by fitting the binary function relationship of the output voltage with respect to temperature and pressure, and using this mathematical model relationship for data analysis, it is possible to accurately predict the thermal runaway risk of the battery module. This method based on the mathematical model relationship improves the accuracy and reliability of the early warning; furthermore, the method of the present invention can monitor the status parameters of the battery module in real time, and once an abnormal situation is found, an early warning signal is immediately issued. This real-time monitoring capability helps to provide sufficient early warning time before thermal runaway occurs, thereby winning valuable time for operators to take preventive measures.

[0017] In the present invention, by setting different levels of warning ranges, different levels of warning signals can be issued according to different risk levels. This hierarchical warning mechanism helps operators better understand the safety status of the battery module and take corresponding countermeasures. The present invention helps to reduce the system failure rate and improve the safety and reliability of the entire system by improving the thermal runaway fault detection capability of the battery energy storage system. The present invention helps to reduce the damage caused to personnel and equipment by thermal runaway events and ensure personnel safety by early warning and timely preventive measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic flow chart of a battery module thermal runaway early warning method in an embodiment of the present invention; Figure 2 is a schematic diagram of a battery module in an embodiment of the present invention; Figure 3 is a schematic diagram of a battery module thermal runaway warning system in an embodiment of the present invention; Figure 4 is a schematic diagram of a battery module thermal runaway warning system in a specific embodiment of the present invention; The explanation of the reference numerals in the figures is as follows: 1. Bottom insulation sheet; 2. Battery cell; 3. Steel strip; 4. End plate; 5. Thin film pressure sensor; 6. Copper busbar; 7. Positive terminal; 8. Negative terminal. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments and technical solutions are only part of the embodiments of the present invention, not all of the embodiments.

[0021] All other embodiments obtained by those of ordinary skill in the art without creative work based on the technical solutions disclosed in the embodiments of the present invention belong to the scope of protection of the present invention. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] See also Figure 1 , a battery module thermal runaway early warning method provided by an embodiment of the present invention comprises the following steps: Step 1, based on a thin film pressure sensor provided in a battery module to be warned of thermal runaway, obtaining an output voltage of the thin film pressure sensor; Step 2: Based on the output voltage obtained in step 1, a thermal runaway warning of the battery module is performed according to the pre-acquired warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; Use pressure sensors and thermocouples to record the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states; analyze and compare the surface stress and surface temperature of the battery module under various working conditions, and determine the graded warning range of pressure and temperature by comparing the differences between normal and fault states; Based on the graded warning range of pressure and temperature and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure, the warning classification of the output voltage of the thin film pressure sensor is determined through the binary function relationship.

[0023] The battery module thermal runaway early warning method based on a thin film pressure sensor disclosed in the embodiment of the present invention is an efficient and accurate battery management warning technology, which aims to detect and warn possible thermal runaway risks in advance by real-time monitoring and analysis of the state parameters of the battery module, thereby improving the safety and reliability of the battery energy storage system. Specifically, the technical solution of the embodiment of the present invention adopts a thin film pressure sensor coupled with surface stress and surface temperature, and fits the binary function relationship of its output voltage with respect to temperature and pressure; in the normal and fault states, respectively, the pressure and temperature changes of the battery module are measured, and based on the obtained binary function relationship of the output voltage with respect to temperature and pressure, the difference between the pressure and temperature changes between the normal state and the fault state is compared, and the graded warning range of the pressure and temperature is determined, and the graded warning range of the output voltage of the pressure sensor is further determined by the binary function relationship. In specific applications, the output voltage of the thin film pressure sensor set in the battery module to be warned of thermal runaway is monitored, and when it reaches the corresponding level warning range, a corresponding warning signal is issued. In summary, the technical solution of the embodiment of the present invention can achieve efficient and accurate judgment of thermal runaway warning based on the output voltage characteristics of the thin film pressure sensor, and can significantly improve the thermal runaway fault detection capability of the battery energy storage system.

[0024] In one embodiment of the present invention, in the step of recording the output voltage of the thin film pressure sensor under different temperatures and pressures, and fitting to obtain the binary function relationship between the output voltage of the thin film pressure sensor and the temperature and pressure, The thin film pressure sensor is fitted with a functional relationship independently of the battery module; wherein the fitted functional relationship includes the relationship between the surface stress and the output voltage, and the surface temperature acts as a correction term to affect the relationship; or, the temperature and pressure are the relationship between the two independent variables and the output voltage.

[0025] Example Explanatory, we mainly focus on the effect of surface stress (σ) on the output voltage of the thin film pressure sensor ( Vout ), the surface temperature (T) is regarded as a correction term to adjust the above influence relationship. The functional relationship can be expressed as: Vout = f ( σ )+ g ( σ , T ); In the formula, f ( σ ) represents the basic relationship between surface stress and output voltage at a specific temperature (such as room temperature); g ( σ , T ) is a correction function used to describe how the above basic relationship changes at different temperatures; The benefit of this model is that it allows the effect of stress to be analyzed separately and takes into account the moderating effect of temperature on this relationship.

[0026] Example Explanatory, the relationship between temperature and pressure as two independent variables and output voltage is a more comprehensive model, which regards both temperature (T) and pressure (or surface stress, σ) as independent variables and directly establishes the functional relationship between them and the output voltage. This relationship can be expressed as: Vout = h ( T , σ ); In the formula, h It is a binary function that describes the variation of output voltage under the combined effect of temperature and pressure; This model is more complex but provides more comprehensive information because it considers the effects of both temperature and pressure on the sensor output.

[0027] The embodiment of the present invention specifically provides the steps for obtaining the binary function relationship. In order to fit the function relationship, it is necessary to collect a large amount of sensor output data under different temperature and pressure conditions. These data should cover the temperature and pressure under various working conditions that the battery module may encounter to ensure the accuracy and generalization ability of the model. In practical applications, it may be found that the model performs poorly under certain specific conditions. At this time, the model needs to be corrected and optimized according to the actual situation to improve its accuracy and reliability. Although the thin film pressure sensor is independent of the battery module for functional relationship fitting, in practical applications, it is also necessary to consider the interaction and influencing factors between the sensor and the battery module to ensure the overall performance of the early warning system. Based on the above preferred scheme, the present invention can more accurately describe the relationship between the output voltage of the thin film pressure sensor and the state of the battery module, providing more powerful support for the early warning of thermal runaway of the battery module.

[0028] In one embodiment of the present invention, in the step of using a pressure sensor and a thermocouple to record the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states, The thin film pressure sensor is installed in the center of the battery module composed of multiple battery cells; Any battery cell in the battery module, due to thermal runaway, will cause surface stress changes to the thin film pressure sensor in the middle, causing the output voltage to change.

[0029] In one embodiment of the present invention, based on the analysis and comparison of the surface stress and surface temperature of the battery module under various working conditions, by comparing the difference between the pressure and temperature in a normal state and a fault state, in the step of determining the graded warning range of the pressure and temperature, When the battery module is working normally, its pressure and temperature should be within the specified values. When the output voltage of the film pressure sensor reaches the voltage value determined by the binary function relationship of these specified values, it is judged as different warning levels; among them, According to the experimental data obtained from the battery module status test, by comparing the temperature change information under abnormal working conditions and the temperature change information under normal working conditions, two temperature characteristic values ​​T1 and T2 with obvious changes before the first valve spray of the first thermal runaway battery in the battery module are obtained. Similarly, the pressure characteristic values ​​P1 and P2 can be obtained; The areas divided according to the relevant characteristic values ​​serve as the basis for early warning classification, including: When T<T1 and P<P1, it is judged to be a normal operating state; When T1≤T<T2 or P1≤P<P2, it is judged as a first-level warning risky working state; When T>T2 or P>P2, it is judged as a second-level warning high-risk working state.

[0030] In one embodiment of the present invention, in the step of performing thermal runaway warning for the battery module according to the pre-acquired warning classification, the warning signal is transmitted in the form of sound, light signal or network notification.

[0031] In one embodiment of the present invention, after step 2, the method further includes: Step 3, measures taken based on the warning signal include but are not limited to automatically reducing the charging rate of the battery pack, adjusting the working status of the cooling system, or sending an alarm message to the operation and maintenance personnel.

[0032] See also Figure 2 In the embodiment of the present invention, the battery module mainly includes a bottom insulating sheet 1, a battery cell 2, a steel strip 3, an end plate 4, a copper busbar 6, a positive terminal 7 and a negative terminal 8; wherein, the number of battery cells 2 is 8, and the 8 battery cells 2 are connected in series through the copper busbar 6 to form a complete battery module; the copper busbar 6 is used to connect two adjacent battery cells 2 units to ensure that electric energy can be transmitted between the battery cells; the multiple battery cells 2 are tightly fitted by the clamp, and when a battery cell in the battery module changes its surface stress due to thermal runaway, the pressure can be better transmitted to the thin film pressure sensor 5 arranged in the center of the battery module, so that its output voltage changes accordingly.

[0033] To sum up, in the technical solution disclosed in the embodiment of the present invention, the thin film pressure sensor can be installed in the center of the battery module based on the coupling of battery surface stress and surface temperature. For the selected thin film pressure sensor, the output voltage is recorded independently at different pressures and temperatures, and the binary function relationship of its output voltage with respect to temperature and pressure is fitted; based on the pressure and temperature changes tested by the pressure sensor and the thermocouple under normal and fault conditions, the graded warning range of pressure and temperature is determined according to the difference, and finally the warning grade of the output voltage is determined by the obtained binary function relationship; in the process of specific application, the obtained output voltage value is judged according to the determined warning grade range, and the specific warning level is determined according to the output voltage value exceeding different thresholds, thereby realizing different warnings in grades.

[0034] The following are device embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0035] See also Figure 3 In an embodiment of the present invention, a battery module thermal runaway warning system is provided, comprising: A data acquisition module, configured to acquire an output voltage of a thin film pressure sensor provided in a battery module to be warned of thermal runaway based on the thin film pressure sensor; An early warning module, configured to provide a thermal runaway early warning for the battery module based on the obtained output voltage of the thin film pressure sensor and the pre-acquired early warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; In both normal and fault states, the surface stress and surface temperature of the battery module under various working conditions are recorded respectively; based on the surface stress and surface temperature of the battery module under various working conditions, analysis and comparison are performed, and by comparing the differences between the surface stress and surface temperature in normal state and fault state, the graded warning range of pressure and temperature is determined; Based on the graded warning range of pressure and temperature, the warning grade of the output voltage of the thin film pressure sensor is determined by the binary function relationship.

[0036] See also Figure 4 In a specific embodiment of the present invention, a battery module thermal runaway early warning system based on a thin film pressure sensor is provided, comprising: a sensor fitting test module, a battery module status test module, a prediction and decision module, and a thermal runaway warning module; wherein, The sensor fitting test module adopts a thin film pressure sensor, and records the output voltage of the thin film pressure sensor under different temperatures and pressures, and obtains the binary function relationship of the output voltage with respect to temperature and pressure by fitting; The battery module status test module uses a pressure sensor and a thermocouple to record the surface stress distribution and surface temperature changes of the battery module under various working conditions in normal and fault states; The prediction and decision module determines the graded warning range of pressure and temperature based on the pressure and temperature tested in normal and fault states and the binary function relationship between the output voltage of the pressure sensor and temperature and pressure, by comparing the difference between the pressure and temperature in the normal state and the fault state, and further determines the graded warning range of the output voltage of the pressure sensor through the binary function relationship; The thermal runaway warning module monitors the output voltage of the thin film pressure sensor and sends out a corresponding warning signal according to the graded warning range provided by the prediction and decision module when the output voltage of the pressure sensor reaches the corresponding level warning range.

[0037] In a further example scheme, the thermal runaway warning module includes a data processing unit, a data storage unit and a real-time graded warning unit; the thermal runaway warning module is used to collect and process the output voltage signal, judge the voltage value of the output voltage according to the determined graded warning range, and determine the fault level if the voltage value exceeds different thresholds, thereby performing different graded warnings; wherein, the thermal runaway warning module transmits the acquired voltage data to the data processing unit, performs real-time analysis of the voltage value, and obtains real-time pressure and temperature values ​​through functional relationships, thereby providing a thermal runaway warning for the battery module.

[0038] In one embodiment of the present invention, a computer device is provided, the computer device comprising a processor and a memory, the memory is used to store a computer program, the computer program comprises program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used to perform the operation of the battery module thermal runaway warning method.

[0039] In one embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM (Random Access Memory) memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the battery module thermal runaway warning method in the above embodiment.

[0040] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program codes.

[0041] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0042] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A battery module thermal runaway early warning method, characterized in that: The following steps are involved: Based on a thin film pressure sensor provided in a battery module to be warned of thermal runaway, an output voltage of the thin film pressure sensor is obtained; Based on the obtained output voltage of the thin film pressure sensor, a thermal runaway warning of the battery module is performed according to the pre-acquired warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; In both normal and fault states, the surface stress and surface temperature of the battery module under various working conditions are recorded respectively; based on the surface stress and surface temperature of the battery module under various working conditions, analysis and comparison are performed, and by comparing the differences between the surface stress and surface temperature in normal state and fault state, the graded warning range of pressure and temperature is determined; Based on the graded warning range of pressure and temperature, the warning grade of the output voltage of the thin film pressure sensor is determined by the binary function relationship.

2. A battery module thermal runaway early warning method according to claim 1, characterized in that: In the step of obtaining the output voltage of the thin film pressure sensor based on the thin film pressure sensor provided in the battery module to be warned of thermal runaway, The thin film pressure sensor is arranged at the center of the battery module.

3. A battery module thermal runaway early warning method according to claim 1, characterized in that: In the step of recording the output voltage of the thin film pressure sensor under different temperatures and pressures, and fitting to obtain the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure, The binary function relationship includes the relationship between pressure and output voltage, and temperature is used as a correction term; Alternatively, the binary function relationship is the relationship between temperature and pressure as two independent variables and the output voltage.

4. A battery module thermal runaway early warning method according to claim 1, characterized in that: In the step of recording the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states, Use pressure sensors and thermocouples to record the surface stress and surface temperature of the battery module under various working conditions in both normal and fault states.

5. A battery module thermal runaway early warning method according to claim 1, characterized in that: In the step of analyzing and comparing the surface stress and surface temperature of the battery module under various working conditions, and determining the graded warning range of pressure and temperature by comparing the difference between the surface stress and surface temperature in a normal state and a fault state, The graded warning range of pressure and temperature is expressed as, When T<T1 and P<P1, it is judged to be a normal operating state; When T1≤T<T2 or P1≤P<P2, it is judged as a first-level warning risky working state; When T>T2 or P>P2, it is judged as the second-level warning high-risk working state; Wherein, T represents the collected surface temperature; P represents the collected surface stress; T1 and T2 respectively represent the two temperature characteristic values ​​of the first thermal runaway battery cell in the selected battery module before the first valve spray; P1 and P2 respectively represent the two pressure characteristic values ​​of the first thermal runaway battery cell in the selected battery module before the first valve spray.

6. A battery module thermal runaway early warning method according to claim 1, characterized in that: In the step of performing a thermal runaway warning of the battery module based on the obtained output voltage of the thin film pressure sensor and according to the pre-acquired warning classification, The warning signal is transmitted in the form of sound, light signal or network notification.

7. A battery module thermal runaway early warning method according to claim 1, characterized in that: After the output voltage of the thin film pressure sensor is obtained and the thermal runaway warning of the battery module is performed according to the pre-acquired warning classification, the method further includes: Based on the battery module thermal runaway warning, measures are taken to reduce the charging rate of the battery pack, adjust the working status of the cooling system, or send alarm information to operation and maintenance personnel.

8. A battery module thermal runaway warning system, characterized in that: include: A data acquisition module, configured to acquire an output voltage of a thin film pressure sensor provided in a battery module to be warned of thermal runaway based on the thin film pressure sensor; An early warning module, configured to provide a thermal runaway early warning for the battery module based on the obtained output voltage of the thin film pressure sensor and the pre-acquired early warning classification; The step of obtaining the pre-acquired warning classification includes: The output voltage of the thin film pressure sensor is recorded under different temperatures and pressures, and the binary function relationship between the output voltage of the thin film pressure sensor and temperature and pressure is obtained by fitting; In both normal and fault states, the surface stress and surface temperature of the battery module under various working conditions are recorded respectively; based on the surface stress and surface temperature of the battery module under various working conditions, analysis and comparison are performed, and by comparing the differences between the surface stress and surface temperature in normal state and fault state, the graded warning range of pressure and temperature is determined; Based on the graded warning range of pressure and temperature, the warning grade of the output voltage of the thin film pressure sensor is determined by the binary function relationship.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the battery module thermal runaway warning method according to any one of claims 1 to 7 is implemented.

10. 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 battery module thermal runaway warning method according to any one of claims 1 to 7 is implemented.

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