Method and device for determining thermal safety performance index of battery and integrated sensor

Abstract

The invention discloses a method and a device for determining a thermal safety performance index of a battery and an integrated sensor. The method comprises the steps that a target electric signal and a target optical signal corresponding to a target battery are acquired, the target electric signal is acquired by a temperature sensor component in an integrated sensor, the target optical signal is acquired by a pressure sensor component, and the temperature sensor component and the pressure sensor component are isolated by an insulating layer; the temperature sensor component comprises a thermocouple probe and a thermocouple lead, the thermocouple probe comprises different conductor material parts, and the pressure sensor component comprises a pressure sensor cavity and an optical fiber; determining target temperature information according to the target electric signal, and determining target pressure information according to the target optical signal; and determining a thermal safety performance index of the target battery according to the target temperature information and the target pressure information. The technical problem that the thermal safety performance index is difficult to determine accurately due to the fact that various signals are difficult to acquire accurately in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of batteries, and more specifically, to a method, apparatus, and integrated sensor for determining the thermal safety performance index of a battery. Background Technology

[0002] As the energy density and capacity of cylindrical batteries continue to improve, their performance is affected by various factors such as system design and process parameters. To accurately assess the impact of different design schemes on cell performance, obtaining key physical state information such as internal temperature and pressure is crucial. However, cylindrical batteries are characterized by high integration and high internal space utilization. Implanting multiple sensors would not only occupy excessive internal space, thus affecting cell performance, but could also lead to crosstalk issues between sensor signals.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a method, apparatus, and integrated sensor for determining the thermal safety performance index of a battery, thereby at least solving the technical problem in related technologies that it is difficult to accurately collect multiple signals and thus difficult to accurately determine the thermal safety performance index.

[0005] According to one aspect of the present invention, a method for determining the thermal safety performance index of a battery is provided, comprising: acquiring a target electrical signal and a target optical signal corresponding to a target battery, wherein the target electrical signal is acquired by a temperature sensor component in an integrated sensor, the target optical signal is acquired by a pressure sensor component in the integrated sensor, the temperature sensor component and the pressure sensor component are isolated by an insulating layer, the temperature sensor component includes a thermocouple probe and thermocouple leads, the thermocouple probe is connected to the thermocouple leads, the thermocouple probe is connected to a controller through the thermocouple leads, the thermocouple probe is connected to the target battery, the thermocouple probe includes portions of different conductor materials, the pressure sensor component includes a pressure sensor cavity and an optical fiber, the pressure sensor cavity is connected to the optical fiber, the pressure sensor cavity is connected to the controller through the optical fiber, and the pressure sensor cavity is connected to the target battery; determining target temperature information based on the target electrical signal, and determining target pressure information based on the target optical signal; and determining the thermal safety performance index of the target battery based on the target temperature information and the target pressure information.

[0006] Optionally, determining target temperature information based on the target electrical signal and target pressure information based on the target optical signal includes: acquiring a sample battery, first component parameters of the temperature sensor component, and second component parameters of the pressure sensor component; determining a first correspondence between the electrical signal and temperature information based on the first component parameters and a first test result of a temperature test on the sample battery, and determining a second correspondence between the optical signal and pressure information based on the second component parameters and a second test result of a pressure test on the sample battery; determining the target temperature information from the first correspondence based on the target electrical signal, and determining the target pressure information from the second correspondence based on the target optical signal.

[0007] Optionally, determining the thermal safety performance index of the target battery based on the target temperature information and the target pressure information includes: when there are multiple temperature information and multiple pressure information, obtaining a superimposed parameter change graph based on the multiple temperature information and multiple pressure information, wherein the superimposed parameter change graph includes the curve relationship between the temperature change rate and time, and the curve relationship between the pressure change rate and time; determining the target inflection point and the inflection point parameter corresponding to the target inflection point based on the superimposed parameter change graph; and determining the thermal safety performance index of the target battery based on the target inflection point and the inflection point parameter corresponding to the target inflection point.

[0008] Optionally, determining target temperature information based on the target electrical signal and target pressure information based on the target optical signal includes: determining electromotive force information based on the target electrical signal and determining the offset wavelength of the interference spectrum based on the target optical signal; determining the target temperature information based on the electromotive force information and determining the target pressure information based on the offset wavelength.

[0009] According to one aspect of the present invention, an integrated sensor is provided, comprising: a temperature sensor component, a pressure sensor component, and an insulating layer, wherein the insulating layer is at least used to isolate the temperature sensor component and the pressure sensor component; the temperature sensor component includes a thermocouple probe and a thermocouple lead, the thermocouple probe being connected to the thermocouple lead; the thermocouple probe being used to connect to a controller via the thermocouple lead; the thermocouple probe being used to connect to a battery; the thermocouple probe includes portions of different conductor materials to acquire electrical signals; the electrical signals are different at the connection regions of the different material portions due to different temperature differences generating different thermoelectric potentials; the pressure sensor component includes a pressure sensor cavity and an optical fiber, the pressure sensor cavity being connected to the optical fiber; the pressure sensor cavity being used to connect to the controller via the optical fiber; the pressure sensor cavity being used to connect to the battery; the pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals; the optical signals are different due to different wavelength shifts in the interference spectrum caused by different refractive indices of the gas within the cavity under different pressures.

[0010] Optionally, the integrated sensor further includes a target sensor component, wherein the insulating layer is also used to isolate the target sensor component from the temperature sensor component and from the pressure sensor component.

[0011] According to one aspect of the present invention, a device for determining the thermal safety performance index of a battery is provided, comprising: an acquisition module for acquiring a target electrical signal and a target optical signal corresponding to a target battery, wherein the target electrical signal is acquired by a temperature sensor component in an integrated sensor, the target optical signal is acquired by a pressure sensor component in the integrated sensor, the temperature sensor component and the pressure sensor component are isolated by an insulating layer, the temperature sensor component includes a thermocouple probe and thermocouple leads, the thermocouple probe is connected to the thermocouple leads, the thermocouple probe is connected to a controller through the thermocouple leads, the thermocouple probe is connected to the target battery, the thermocouple probe includes portions of different conductor materials, the pressure sensor component includes a pressure sensor cavity and an optical fiber, the pressure sensor cavity is connected to the optical fiber, the pressure sensor cavity is connected to the controller through the optical fiber, and the pressure sensor cavity is connected to the target battery; a first determination module for determining target temperature information based on the target electrical signal and target pressure information based on the target optical signal; and a second determination module for determining the thermal safety performance index of the target battery based on the target temperature information and the target pressure information.

[0012] According to one aspect of the present invention, a system for determining the thermal safety performance index of a battery is provided, comprising: an integrated sensor, a battery, and a controller, wherein the integrated sensor includes a temperature sensor component, a pressure sensor component, and an insulating layer, the insulating layer being at least used to isolate the temperature sensor component from the pressure sensor component, the temperature sensor component including a thermocouple probe and thermocouple leads, the thermocouple probe being connected to the thermocouple leads, the thermocouple probe being used to connect to the controller via the thermocouple leads, the thermocouple probe being used to connect to the battery, and the thermocouple probe including portions of different conductive materials to acquire electrical signals, the electrical signals generating different thermoelectric potentials at the connection regions of the different material portions due to different temperature differences. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is used to connect to the controller via the optical fiber. The pressure sensor cavity is also used to connect to the battery. The pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals. The optical signals vary due to the different refractive indices of the gas inside the cavity at different pressures, resulting in different wavelength shifts in the interference spectrum. The controller is used to acquire the target electrical signal and the target optical signal corresponding to the target battery. Based on the target electrical signal, the controller determines the target temperature information, and based on the target optical signal, it determines the target pressure information. Based on the target temperature information and the target pressure information, the controller determines the thermal safety performance index of the target battery.

[0013] According to one aspect of the present invention, an electronic device is provided, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the instructions to implement the method for determining the thermal safety performance index of a battery as described in any of the preceding embodiments.

[0014] According to one aspect of the present invention, a computer-readable storage medium is provided, wherein when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to perform the battery thermal safety performance index determination method described in any of the preceding claims.

[0015] In this embodiment of the invention, target electrical signals and target optical signals corresponding to the target battery are acquired. The target electrical signals are acquired by a temperature sensor component within an integrated sensor, and the target optical signals are acquired by a pressure sensor component within the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads, connected to the thermocouple leads. The thermocouple probe is connected to a controller via the thermocouple leads and is also connected to the target battery. The thermocouple probe includes portions made of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber, connected to the optical fiber. The pressure sensor cavity is connected to the controller via the optical fiber and is also connected to the target battery. Based on the target electrical signals, target temperature information is determined, and based on the target optical signals, target pressure information is determined. Based on the target temperature and target pressure information, the thermal safety performance index of the target battery is determined. As can be seen, this embodiment uses a highly integrated micro-sensor to separate the acquisition paths of electrical signals and optical signals and uses an insulating layer to avoid crosstalk between signals, thereby achieving the goal of accurately and independently acquiring internal battery temperature and pressure data. This enables the technical effect of accurately evaluating the thermal safety performance of the battery based on measured data, and solves the technical problem in related technologies that it is difficult to accurately acquire multiple signals and thus difficult to accurately determine the thermal safety performance index. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a flowchart of a method for determining the thermal safety performance index of a battery according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of a sensor probe provided in an optional embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the thermocouple temperature-thermoelectric potential response provided by an optional embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the relationship between FPI wavelength shift and pressure curve provided by an optional embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of different SoC thermal runaway early warning judgment data feature points provided by optional embodiments of the present invention;

[0022] Figure 6 This is a structural block diagram of a battery thermal safety performance index determination device according to an embodiment of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] Example 1

[0026] According to an embodiment of the present invention, an embodiment of a method for determining the thermal safety performance index of a battery is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] Figure 1 This is a flowchart of a method for determining the thermal safety performance index of a battery according to an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes the following steps:

[0028] Step S102: Acquire the target electrical signal and target optical signal corresponding to the target battery. The target electrical signal is acquired by the temperature sensor component in the integrated sensor, and the target optical signal is acquired by the pressure sensor component in the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads. The thermocouple probe and thermocouple leads are connected. The thermocouple probe is connected to the controller through the thermocouple leads. The thermocouple probe is connected to the target battery. The thermocouple probe includes parts of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber. The pressure sensor cavity is connected to the controller through the optical fiber. The pressure sensor cavity is connected to the target battery.

[0029] In step S102 of this application, the target electrical signal and target optical signal corresponding to the target battery are obtained.

[0030] This involves target batteries, which are batteries that can monitor internal temperature and pressure. These can be any battery that requires monitoring of thermal safety performance, such as lithium-ion batteries for electric vehicles.

[0031] This involves the target electrical signal, which is a signal collected by a thermocouple probe that reflects the internal temperature change of the battery and is a form of electrical signal.

[0032] This involves target optical signals, which are signals collected by sensor probes that reflect changes in the internal pressure of the battery and are a form of optical signal.

[0033] This involves integrated sensors, which are sensors that integrate temperature and pressure sensor components to acquire at least the temperature and pressure information inside the battery.

[0034] This involves an insulating layer located between the temperature sensor component and the pressure sensor component, used for physical isolation to prevent interference between electrical and optical signals.

[0035] This involves thermocouple probes, which are temperature sensors that measure temperature by generating a thermoelectric potential when two different metal materials come into contact and the temperature changes.

[0036] This involves thermocouple leads, which are wires used to transmit the thermoelectric potential signal generated by the thermocouple probe to the controller.

[0037] This involves a controller, which receives and processes signals from sensors to create an electronic device that can calculate and output temperature and pressure information.

[0038] This involves the pressure sensor cavity, which is the core part of the pressure sensor. Changes in the gas pressure inside the cavity will cause the wavelength of the optical signal to shift.

[0039] This involves optical fiber, which is used as a medium to transmit optical signals generated by the cavity of the pressure sensor, and can maintain the integrity of the signal and is not affected by electromagnetic interference.

[0040] In this step, the integrated sensors simultaneously acquire the internal temperature and pressure signals of the target battery through a thermocouple probe and a pressure sensor cavity, respectively. The thermocouple probe transmits the electrical signal to the controller via thermocouple leads, while the pressure sensor transmits the optical signal to the controller via optical fiber.

[0041] By separating the acquisition paths of electrical and optical signals and using an insulating layer to avoid crosstalk between signals, the quality and reliability of sensor data are ensured, laying a solid foundation for subsequent data processing.

[0042] Step S104: Determine the target temperature information based on the target electrical signal, and determine the target pressure information based on the target optical signal;

[0043] In step S104 of this application, target temperature information and target pressure information are determined.

[0044] The controller receives the target electrical and optical signals and converts them into target temperature and pressure information. This conversion transforms complex physical state changes into readable data, facilitating subsequent analysis and utilization, and enhancing the system's data processing capabilities and information transparency.

[0045] Step S106: Determine the thermal safety performance index of the target battery based on the target temperature information and target pressure information.

[0046] In step S106 of this application, the thermal safety performance index of the target battery is determined based on the target temperature information and the target pressure information.

[0047] This includes the thermal safety performance index, which is a comprehensive indicator of the battery's internal temperature and pressure to evaluate its thermal safety performance. It is a key parameter for determining whether the battery is in a controllable state.

[0048] By analyzing target temperature and pressure information, a thermal safety performance index for the target battery is determined. This is a comprehensive method for evaluating the battery's thermal stability performance. By comprehensively considering the dynamic changes in internal temperature and pressure, the thermal safety performance of the battery under different State of Charge (SOC) states can be more accurately assessed. This is crucial for preventing thermal runaway and improving battery life and safety. By establishing a universal thermal safety performance index, even test data based on low SOC states can provide effective prediction and early warning for battery safety under high SOC states, significantly reducing testing costs and improving the response speed and accuracy of battery management systems to thermal runaway risks.

[0049] Through steps S102-S106 above, the target electrical signal and target optical signal corresponding to the target battery are acquired. The target electrical signal is acquired by the temperature sensor component in the integrated sensor, and the target optical signal is acquired by the pressure sensor component in the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads, which are connected together. The thermocouple probe is connected to the controller via the thermocouple leads and is also connected to the target battery. The thermocouple probe includes parts made of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber, which are connected together. The pressure sensor cavity is connected to the controller via the optical fiber and is also connected to the target battery. Based on the target electrical signal, the target temperature information is determined, and based on the target optical signal, the target pressure information is determined. Based on the target temperature information and the target pressure information, the thermal safety performance index of the target battery is determined. As can be seen, this embodiment uses a highly integrated micro-sensor to separate the acquisition paths of electrical signals and optical signals and uses an insulating layer to avoid crosstalk between signals, thereby achieving the goal of accurately and independently acquiring internal battery temperature and pressure data. This enables the technical effect of accurately evaluating the thermal safety performance of the battery based on measured data, and solves the technical problem in related technologies that it is difficult to accurately acquire multiple signals and thus difficult to accurately determine the thermal safety performance index.

[0050] As an optional embodiment, determining target temperature information based on a target electrical signal and target pressure information based on a target optical signal includes: acquiring first component parameters of a sample battery and a temperature sensor component, and acquiring second component parameters of a pressure sensor component; determining a first correspondence between the electrical signal and temperature information based on the first component parameters and a first test result of a temperature test on the sample battery, and determining a second correspondence between the optical signal and pressure information based on the second component parameters and a second test result of a pressure test on the sample battery; determining the target temperature information from the first correspondence based on the target electrical signal, and determining the target pressure information from the second correspondence based on the target optical signal.

[0051] This embodiment illustrates the method for determining temperature and pressure information.

[0052] This includes sample batteries, which are used to calibrate sensors and establish signal-information correspondences. Their performance and condition should be representative of the target battery.

[0053] This involves temperature sensor components, which mainly include thermocouple probes used to sense changes in the internal temperature of the battery and convert them into electrical signals.

[0054] This involves a pressure sensor component, which mainly includes a pressure sensor cavity used to sense changes in the internal pressure of the battery and convert them into light signals.

[0055] This involves the parameters of the first component, which include relevant parameters of the temperature sensor component that generate electrical signals under different temperature conditions, such as the material combination and geometry of the thermocouple. These parameters affect the magnitude and characteristics of the electrical signal.

[0056] This involves the parameters of the second component, which include relevant parameters of the pressure sensor component that generate optical signals under different pressure conditions, such as the size of the cavity and the type of filling gas. These parameters affect the wavelength shift and characteristics of the optical signal.

[0057] This involves the first test result, which is the actual temperature data obtained by conducting temperature tests on the sample battery. This data is used to calibrate the temperature sensor component and establish the correspondence between electrical signals and temperature information.

[0058] This includes the second test result, which is the actual pressure data obtained by performing a pressure test on the sample battery. This data is used to calibrate the pressure sensor component and establish the correspondence between the optical signal and the pressure information.

[0059] This involves the first correspondence, namely the correspondence table or mathematical model between electrical signals and the internal temperature of the battery, which is used to extract temperature information from the electrical signals.

[0060] This involves a second correspondence, namely a correspondence table or mathematical model between optical signals and the internal pressure of the battery, which is used to extract pressure information from the optical signals.

[0061] In this step, component parameters and test results are acquired. By testing under known conditions, the sensor's response characteristics in a specific environment are obtained, which is a prerequisite for establishing the correspondence between signals and information. Targeted testing for different types of batteries ensures the universality and accuracy of sensor component parameters, improving the reliability of subsequent data processing. Based on experimental data, correspondences between electrical signals and temperature information, and between optical signals and pressure information, are established. This allows the raw signals collected by the sensor to be converted into meaningful physical quantities, such as temperature and pressure values. Mathematical modeling or table lookup ensures the interpretability and operability of the sensor data, laying the foundation for subsequent performance evaluation. Finally, during real-time monitoring of the target battery, the signals collected by the sensor components can be rapidly converted into temperature and pressure information through preset first and second correspondences, enabling real-time monitoring of the battery's internal state. This instantaneous data conversion improves the response speed and accuracy of battery thermal safety management, which is of great significance for early detection of anomalies and prevention of thermal runaway events.

[0062] This process begins with acquiring the basic parameters of the sensor components. Through a series of tests on the sample battery, the correspondence between electrical signals and temperature information, and optical signals and pressure information, is established, ensuring the accuracy and reliability of signal conversion. During the target battery monitoring phase, the signals collected by the sensors can be quickly and accurately converted into temperature and pressure information, providing real-time data for thermal safety performance assessment. This empirically-based signal analysis scheme significantly reduces the impact of signal interference and improves data accuracy, making the determination of thermal safety performance indices more objective and reliable. This, in turn, enhances the effectiveness of battery thermal safety management, reduces the risk of thermal runaway, and ensures the safety of equipment and personnel.

[0063] As an optional embodiment, the thermal safety performance index of the target battery is determined based on target temperature information and target pressure information, including: when there are multiple temperature information and multiple pressure information, obtaining a superimposed parameter change graph based on the multiple temperature information and multiple pressure information, wherein the superimposed parameter change graph includes the curve relationship between temperature change rate and time, and the curve relationship between pressure change rate and time; determining the target inflection point and the inflection point parameter corresponding to the target inflection point based on the superimposed parameter change graph; and determining the thermal safety performance index of the target battery based on the target inflection point and the inflection point parameter corresponding to the target inflection point.

[0064] This embodiment illustrates a method for determining the thermal safety performance index of a target battery.

[0065] This includes a superimposed parameter variation graph, which plots the time series data of target temperature and target pressure information onto the same time axis to visually demonstrate the changes in the rate of temperature change and the rate of pressure change over time.

[0066] This involves the rate of temperature change, which represents how quickly the internal temperature of the target battery changes over time. It is a derived parameter of the target temperature information and can reveal how fast or slow the heat accumulates or is released inside the battery.

[0067] This involves the rate of pressure change, which represents the speed at which the internal pressure of the target battery changes over time, reflecting the pressure change trend caused by changes in the volume or temperature of the gas inside the battery.

[0068] This involves the target inflection point, which is the point in time when the rate of temperature change or the rate of pressure change in the superimposed parameter change graph shows a significant turning point. It is usually the state transition point at which the battery begins to enter the precursor of thermal runaway.

[0069] This involves inflection point parameters, which represent the specific values ​​of temperature and pressure corresponding to the target inflection point, as well as the characteristic values ​​of the turning point of the rate of temperature change and the rate of pressure change.

[0070] In this step, a superimposed parameter change graph is generated. Visualizing the rate of temperature change and the rate of pressure change on the same time axis helps observers intuitively understand the changing trends of the battery's internal state during heating or discharging. By comparing the changes of the two curves, the coordinated or conflicting modes of temperature and pressure changes can be quickly identified, providing a basis for subsequent inflection point analysis. Next, the target inflection point and inflection point parameters are determined. Determining the target inflection point is crucial for thermal runaway early warning, marking the turning point where the battery's internal state transitions from normal to dangerous. By analyzing the superimposed parameter change graph, the moment when the rate of temperature and pressure change increases significantly can be accurately captured, i.e., the target inflection point. The inflection point parameters provide specific temperature and pressure values ​​and their changing trends at the inflection point, providing a quantitative basis for further performance evaluation. Then, the thermal safety performance index is calculated. The calculation of the thermal safety performance index is a comprehensive analytical process that combines the temperature and pressure values ​​and their changing rates from the inflection point parameters, providing a holistic quantitative indicator of the battery's thermal safety status. A higher thermal safety performance index means that the battery has better stability and safety when facing high-temperature and high-pressure environments. By testing batteries at different SOC states at low SOC and then calculating the thermal safety performance index, the thermal safety performance of the battery at high SOC can be indirectly predicted, thus achieving low-cost and low-risk thermal safety performance assessment.

[0071] This method, by overlaying time-series data of target temperature and pressure information onto the same graph, first generates a superimposed parameter change graph that visually displays the trends of these two important parameters over time. Next, through curve analysis, the target inflection points where the rates of temperature and pressure change significantly reverse are identified. These inflection points often mark the critical point where the battery's thermal state transitions from stable to unstable. Finally, based on the specific temperature and pressure information and trends at the inflection points, a thermal safety performance index is calculated. This is an important indicator that comprehensively reflects battery thermal stability and provides early warning of thermal runaway risks. This series of steps effectively transforms the complex internal state of the battery into actionable data, providing a scientific basis for battery thermal safety management and a valuable tool for research in battery design optimization, performance prediction, and failure analysis.

[0072] As an optional embodiment, determining target temperature information based on the target electrical signal and target pressure information based on the target optical signal includes: determining electromotive force information based on the target electrical signal and determining the offset wavelength of the interference spectrum based on the target optical signal; determining target temperature information based on the electromotive force information and determining target pressure information based on the offset wavelength.

[0073] In this embodiment, the steps for determining target temperature information and target pressure information are described.

[0074] This involves electromotive force (EMF) information, which includes the voltage difference information contained in the target electrical signal. It reflects the magnitude of the EMF generated at both ends of the thermocouple due to the temperature difference and is directly related to the internal temperature of the battery.

[0075] This involves the shifted wavelength of the interference spectrum, which is a key parameter in the target optical signal. When the internal pressure of the battery changes, the optical path difference inside the cavity changes, causing a wavelength shift in the interference spectrum. The amount of wavelength shift is linearly related to the amount of pressure change.

[0076] This step transforms the raw electrical and optical signals acquired by the sensors into meaningful electromotive force (EMF) information and offset wavelengths, marking the first step in converting physical signals into specific physical quantities. This conversion clarifies the complexity of the original signals, revealing that the EMF and offset wavelengths are directly correlated with temperature and pressure changes, providing intuitive and quantifiable data for subsequent temperature and pressure determination. Simplifying electrical and optical signals into EMF and wavelength offsets makes data processing more direct and efficient. As physical quantities directly reflecting temperature and pressure changes, the acquisition of EMF and offset wavelengths provides the foundation for accurate conversion. Subsequently, the target temperature is determined based on the EMF information, and the target pressure is determined based on the offset wavelength, enabling real-time monitoring of the battery's internal temperature and pressure. Based on the characteristics of specific sensors (the linear relationship between thermocouple EMF and temperature, and the linear relationship between FPI spectral shift and pressure), the system can acquire high-precision temperature and pressure information, ensuring data reliability and accuracy.

[0077] In this approach, the entire process begins with sensors acquiring signals of temperature and pressure changes inside the battery. By converting electrical signals into electromotive force (EMF) information and optical signals into offset wavelengths in the interference spectrum, a preliminary conversion from signal to information is achieved. This conversion process lays the foundation for the subsequent accurate determination of temperature and pressure information. Utilizing the thermoelectric effect of thermocouples to convert EMF into temperature information and changes in optical path difference to convert offset wavelengths into pressure information, the system can monitor temperature and pressure changes inside the battery in real time and accurately. This monitoring not only provides immediate feedback on the battery's internal state but also provides crucial data support for assessing the battery's thermal safety performance, issuing early warnings of abnormal conditions, and managing battery health. This effectively improves battery safety and reliability and reduces the risk of safety accidents caused by thermal runaway.

[0078] Based on the above embodiments and optional embodiments, an optional implementation method is provided, which is described in detail below.

[0079] In related technologies, as the energy density and capacity of cylindrical batteries continue to improve, their performance is affected by various factors such as system design and process parameters. To accurately assess the impact of different design schemes on cell performance, obtaining key physical state information such as internal temperature and pressure is crucial. However, cylindrical batteries are characterized by high integration and high internal space utilization. Implanting multiple sensors not only occupies excessive internal space, thus affecting cell performance, but may also lead to crosstalk problems between sensor signals.

[0080] Temperature and pressure parameters within a battery cell provide crucial information for studying cell failure and runaway behavior. However, thermal safety testing of fully charged (SoC=100%) cells presents a significant risk of thermal runaway, increasing testing costs and hindering effective post-test analysis of the cell interface. While reducing the SoC can effectively mitigate the risk of thermal runaway, the thermal chamber behavior of low-SoC cells differs significantly from that of fully charged cells, making it difficult to directly infer thermal safety characteristics under full charge conditions from the thermal chamber behavior of low-SoC cells. Therefore, a universal thermal runaway prediction method applicable to different SoC states is urgently needed to accurately obtain thermal safety information of the battery cell without triggering thermal runaway.

[0081] In view of this, an optional embodiment of the present invention provides a highly integrated miniaturized sensor and a method for determining the thermal safety performance index of a battery. This can also be described as a cell thermal runaway early warning scheme based on internal temperature and pressure test data of the battery cell. It introduces a sensor probe without affecting the internal structure of the cylindrical battery cell, and simultaneously acquires pressure and temperature information through optical and electrical signals respectively, effectively avoiding signal interference. Furthermore, it provides a universal thermal stability judgment standard for different SoCs (System-on-Chips). This enables the determination of the thermal safety performance of a battery cell in a high SoC state based on low SoC test data.

[0082] An optional embodiment of this invention provides a highly integrated miniature temperature and pressure sensor design that achieves real-time monitoring of environmental pressure and temperature by acquiring optical and electrical signals, respectively. The independent signal dependencies between the two signals avoid mutual interference between temperature and pressure signals, improving the accuracy and precision of the acquired signals. Furthermore, an optional embodiment of this invention provides a sensor implantation scheme that allows the sensor probe to be introduced inside the battery without damaging its original structure, enabling real-time, in-situ monitoring of the internal temperature and pressure of the battery cell under various operating conditions, without affecting the cell's electrical performance.

[0083] Furthermore, an optional embodiment of the present invention provides a data processing method. This method transforms and processes internal temperature and pressure information collected by built-in sensors during battery cell heating safety testing, constructing a universal evaluation standard for battery cell thermal stability temperature ranges across different SoC states. This allows for the assessment of thermal runaway risk in high SoC states using data obtained from low SoC battery cell heating tests, reducing testing costs. Simultaneously, this data processing method can provide early warning of battery cell thermal runaway, improving the sensitivity of the system's thermal runaway warning response.

[0084] Figure 2 This is a schematic diagram of a sensor probe provided in an optional embodiment of the present invention, as shown below. Figure 2As shown, the temperature-pressure sensor structure design includes:

[0085] Thermocouple sensors (similar to the temperature sensor components described above) acquire internal temperature data. Since there is a linear relationship between ambient temperature changes and probe resistance, temperature information can be obtained through changes in the voltage across the probe. Figure 3 This is a schematic diagram of the thermocouple temperature-thermoelectric potential response provided by an optional embodiment of the present invention, such as... Figure 3 As shown, the temperature-potential relationship can be obtained.

[0086] A pressure sensor (same as the pressure sensor component described above) is used, where the pressure sensor can be an open-cavity Fabry-Perot interferometer (FPI). A fiber optic sensor alters the refractive index of the gas inside the sensor probe cavity due to ambient pressure, causing a shift in the interference spectrum. The shift is linearly related to the pressure; therefore, ambient pressure information can be obtained from the shift in the optical signal. Figure 4 This is a schematic diagram of the relationship between FPI wavelength shift and pressure curve provided by an optional embodiment of the present invention, as shown below. Figure 4 As shown, the pressure-wavelength relationship can be obtained.

[0087] Fiberglass: For sensor integration solutions, fiberglass is used to insulate and encapsulate the FPI and thermocouple probes, allowing pressure and temperature information to be acquired from optical and electrical signals respectively, thus avoiding crosstalk.

[0088] The temperature sensor and pressure sensor are each connected to the corresponding test signal processing equipment via two independent communication lines encapsulated in glass fiber, where they undergo signal conversion and processing.

[0089] The above structural design can accomplish at least the following functions:

[0090] Internal pressure data acquisition: Based on the linear change in gas pressure inside the probe cavity affecting the refractive index, which in turn leads to a linear shift in the wavelength of the interference spectrum, the optical signal is converted and processed by an optical fiber decoder to obtain information on the internal pressure change of the battery cell under different operating conditions.

[0091] Internal temperature signal acquisition: Based on the linear relationship between the temperature and resistance change of the thermocouple probe, a multi-channel recorder can complete the conversion and acquisition between electrical signal and temperature to obtain the internal temperature information of the battery cell under different operating conditions.

[0092] The collected internal temperature and pressure data of the battery cell are processed to obtain the temperature rise rate-time + pressure rise rate-time curve. The curves are superimposed on the same time axis to obtain the trigger inflection point time and temperature. The thermal safety performance of the battery cell system is evaluated based on the inflection point occurrence time / temperature.

[0093] also, Figure 5This is a schematic diagram of different SoC thermal runaway early warning judgment data feature points provided by optional embodiments of the present invention, such as... Figure 5 As shown, the method provided by the optional embodiments of the present invention can also provide a universal thermal stability judgment standard for different SoCs. This enables the determination of the thermal safety performance of a battery cell in a high SoC state based on low SoC test data.

[0094] Specifically, by conducting thermal runaway tests on low-SOC cells, cells with low SOC (e.g., 0%) are selected, and thermal runaway scenarios are simulated. The curves of temperature rise rate and pressure rise rate over time are recorded to identify the key characteristics of thermal runaway warning (e.g., when the temperature rise rate is ≥0.3℃ / s and the pressure rise rate is ≥2kPa / s, it is determined that the thermal runaway warning stage has been entered).

[0095] Subsequently, the criteria for judging low SOC were generalized. Since the dynamic characteristics of thermal runaway under different SOCs are universal, the temperature / pressure change rate threshold and warning interval logic obtained from low SOC tests were used as general criteria for judging thermal stability.

[0096] Finally, the thermal safety assessment of high SOC cells can be directly applied using the aforementioned general standards. The thermal safety performance of high SOC (e.g., 100%) cells can be evaluated without repeatedly conducting thermal runaway tests on high SOC cells. The thermal safety performance can be determined solely through test data from low SOC cells and general standards.

[0097] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0098] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0099] Example 2

[0100] According to an embodiment of the present invention, an integrated sensor is also provided, wherein the sensor includes a temperature sensor component, a pressure sensor component, and an insulating layer, and the device is described in detail below.

[0101] The insulating layer is used to isolate the temperature sensor components from the pressure sensor components.

[0102] The temperature sensor component includes a thermocouple probe, thermocouple leads, and a connection between the thermocouple probe and the thermocouple leads. The thermocouple probe is used to connect to the controller via the thermocouple leads and to connect to the battery. The thermocouple probe includes different conductor material parts to acquire electrical signals. The electrical signals are different at the connection area of ​​the different material parts due to the different temperature differences that generate different thermoelectric potentials.

[0103] The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is used to connect to the controller via the optical fiber. The pressure sensor cavity is also used to connect to the battery. The pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals. The optical signals are different due to the different refractive indices of the gas inside the cavity under different pressures, which causes different wavelength shifts in the interference spectrum.

[0104] This integrated sensor, employing a highly integrated micro-sensor approach, separates the acquisition paths of electrical and optical signals and utilizes an insulating layer to avoid crosstalk between signals. This achieves the goal of accurately and independently acquiring internal battery temperature and pressure data, thereby realizing the technical effect of accurately evaluating battery thermal safety performance based on measured data. It also solves the technical problem in related technologies where it is difficult to accurately acquire multiple signals, thus making it difficult to accurately determine the thermal safety performance index.

[0105] As an optional embodiment, the sensor further includes a target sensor component, wherein the insulating layer is also used to isolate the target sensor component from the temperature sensor component and from the pressure sensor component.

[0106] This involves target sensor components, which are additional sensor components that may be included in the integrated sensor, besides the temperature sensor components and pressure sensor components, to collect other types of signals or data from the target battery, such as humidity, voltage, current, etc.

[0107] This involves an insulating layer, which in integrated sensors serves to physically isolate different sensor components, ensuring that each component operates independently and preventing signal interference. The insulating layer is typically made of materials with high insulating properties, such as ceramics or special polymers.

[0108] By adding target sensor components, the functionality of integrated sensors can be expanded beyond simply monitoring temperature and pressure to include other critical parameters within the battery. This provides a richer and more complete source of information for a comprehensive understanding of the battery's condition, especially for factors that directly impact battery health and safety (such as humidity, voltage, and current). Integrated sensors can monitor more types of physical states, enhancing the battery management system's ability to perceive and control battery status. By comprehensively analyzing data from multiple sensors, potential internal fault points can be located more accurately, aiding in the identification and prevention of early-stage failures.

[0109] Furthermore, the insulation layer not only isolates the temperature and pressure sensor components but also the newly added target sensor component, ensuring the independence and purity of each sensor signal. This physical isolation effectively prevents mutual interference between different sensor signals, improving the accuracy of signal acquisition and data quality. Independent signal transmission paths reduce the possibility of system failures; even if one part of the sensors malfunctions, it will not affect the data acquisition of other sensors, thereby improving the stability and reliability of the entire sensor system.

[0110] In this optional embodiment, the architecture of the integrated sensor is further optimized. By adding target sensor components and strengthening the insulation layer, the sensor can not only simultaneously monitor the internal temperature and pressure of the battery, but also acquire and process other types of signals. This multi-sensor integrated design makes the monitoring of the battery's internal state more comprehensive, helping the battery management system to gain a deeper understanding of the battery's operating condition and health level. Simultaneously, the application of the insulation layer ensures the independence and purity of each signal, reduces interference between signals, and improves the accuracy of data acquisition and the overall stability of the system. This design optimization provides stronger technical support for battery thermal safety management, fault diagnosis, and performance prediction, playing a particularly important role in battery thermal runaway early warning and avoiding data errors caused by signal interference.

[0111] Example 3

[0112] According to an embodiment of the present invention, an apparatus for implementing the above-described method for determining the thermal safety performance index of a battery is also provided. Figure 6 This is a structural block diagram of a battery thermal safety performance index determination device according to an embodiment of the present invention, such as... Figure 6 As shown, the device includes: an acquisition module 602, a first determination module 604, and a second determination module 606. The device will be described in detail below.

[0113] The acquisition module 602 is used to acquire the target electrical signal and target optical signal corresponding to the target battery. The target electrical signal is acquired by a temperature sensor component in the integrated sensor, and the target optical signal is acquired by a pressure sensor component in the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads, connected to the thermocouple leads. The thermocouple probe is connected to the controller via the thermocouple leads and to the target battery. The thermocouple probe includes parts made of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber, connected to the optical fiber. The pressure sensor cavity is connected to the controller via the optical fiber and to the target battery. A first determination module 604, connected to the acquisition module 602, is used to determine the target temperature information based on the target electrical signal and the target pressure information based on the target optical signal. A second determination module 606, connected to the first determination module 604, is used to determine the thermal safety performance index of the target battery based on the target temperature and target pressure information.

[0114] It should be noted that the above-mentioned acquisition module 602, the first determination module 604 and the second determination module 606 correspond to steps S102 to S106 in the method for determining the thermal safety performance index of the battery. The multiple modules and the corresponding steps are the same in terms of implementation examples and application scenarios, but are not limited to the content disclosed in the above embodiment 1.

[0115] Example 4

[0116] According to an embodiment of the present invention, a system for implementing the above-described method for determining the thermal safety performance index of a battery is also provided. The system includes an integrated sensor, a battery, and a controller. The system will be described in detail below.

[0117] The integrated sensor includes a temperature sensor component, a pressure sensor component, and an insulating layer. The insulating layer at least isolates the temperature sensor component from the pressure sensor component. The temperature sensor component includes a thermocouple probe, thermocouple leads, and is connected to the thermocouple leads. The thermocouple probe is used to connect to a controller via the thermocouple leads and to a battery. The thermocouple probe includes portions of different conductor materials to acquire electrical signals. The electrical signals differ at the connection areas of the different material portions due to different temperature differences, resulting in different thermoelectric potentials. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is used to connect to the controller via the optical fiber and to a battery. The pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals. The optical signals differ due to different refractive indices of the gas within the cavity under different pressures, causing different wavelength shifts in the interference spectrum.

[0118] The controller is used to acquire the target electrical signal and target optical signal corresponding to the target battery; determine the target temperature information based on the target electrical signal and the target pressure information based on the target optical signal; and determine the thermal safety performance index of the target battery based on the target temperature information and the target pressure information.

[0119] This setup, employing highly integrated micro-sensors, separates the acquisition paths of electrical and optical signals and utilizes an insulating layer to prevent crosstalk between signals. This achieves the goal of accurately and independently acquiring internal battery temperature and pressure data, thereby realizing the technical effect of accurately evaluating battery thermal safety performance based on measured data. It also solves the technical problem in related technologies where it is difficult to accurately acquire multiple signals and thus difficult to accurately determine the thermal safety performance index.

[0120] Example 5

[0121] According to another aspect of the present invention, an electronic device is also provided, comprising: a processor; and a memory for storing processor-executable instructions, wherein the processor is configured to execute instructions to implement the method for determining the thermal safety performance index of a battery as described above.

[0122] Example 6

[0123] According to another aspect of the present invention, a computer-readable storage medium is also provided, which, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the battery thermal safety performance index determination method described above.

[0124] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0125] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0126] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0127] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0128] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0129] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0130] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the thermal safety performance index of a battery, characterized in that, include: The system acquires target electrical and optical signals corresponding to the target battery. The target electrical signal is acquired by a temperature sensor component within an integrated sensor, and the target optical signal is acquired by a pressure sensor component within the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads, connected to the thermocouple leads and a controller via the thermocouple leads. The thermocouple probe is also connected to the target battery. The thermocouple probe includes portions made of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber, connected to the optical fiber and a controller via the optical fiber. The pressure sensor cavity is also connected to the target battery. Based on the target electrical signal, the target temperature information is determined, and based on the target optical signal, the target pressure information is determined. Based on the target temperature information and the target pressure information, the thermal safety performance index of the target battery is determined.

2. The method according to claim 1, characterized in that, Based on the target electrical signal, target temperature information is determined, and based on the target optical signal, target pressure information is determined, including: Obtain the sample battery, the first component parameters of the temperature sensor component, and the second component parameters of the pressure sensor component; Based on the parameters of the first component and the first test result of the temperature test on the sample battery, a first correspondence between the electrical signal and the temperature information is determined; and based on the parameters of the second component and the second test result of the pressure test on the sample battery, a second correspondence between the optical signal and the pressure information is determined. Based on the target electrical signal, the target temperature information is determined from the first correspondence, and based on the target optical signal, the target pressure information is determined from the second correspondence.

3. The method according to claim 1, characterized in that, Based on the target temperature information and the target pressure information, the thermal safety performance index of the target battery is determined, including: When there are multiple temperature and pressure data, a superimposed parameter change graph is obtained based on the multiple temperature and pressure data. The superimposed parameter change graph includes the curve relationship between the rate of temperature change and time, and the curve relationship between the rate of pressure change and time. Based on the superimposed parameter change graph, the target inflection point and the inflection point parameters corresponding to the target inflection point are determined; Based on the target inflection point and the inflection point parameters corresponding to the target inflection point, the thermal safety performance index of the target battery is determined.

4. The method according to any one of claims 1 to 3, characterized in that, Based on the target electrical signal, target temperature information is determined, and based on the target optical signal, target pressure information is determined, including: Based on the target electrical signal, the electromotive force information is determined, and based on the target optical signal, the offset wavelength of the interference spectrum is determined; Based on the electromotive force information, the target temperature information is determined, and based on the offset wavelength, the target pressure information is determined.

5. An integrated sensor, characterized in that, include: Temperature sensor components, pressure sensor components, insulating layer, among which... The insulating layer serves at least to isolate the temperature sensor component from the pressure sensor component. The temperature sensor component includes a thermocouple probe and thermocouple leads. The thermocouple probe is connected to the thermocouple leads. The thermocouple probe is used to connect to the controller via the thermocouple leads. The thermocouple probe is used to connect to the battery. The thermocouple probe includes different conductor material parts to obtain electrical signals. The electrical signals are different at the connection area of ​​the different material parts due to the different temperature differences that generate different thermoelectric potentials. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is used to connect to the controller via the optical fiber. The pressure sensor cavity is also used to connect to the battery. The pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals. The optical signals are different due to the different refractive indices of the gas inside the cavity under different pressures, which causes different wavelength shifts in the interference spectrum.

6. The sensor according to claim 5, characterized in that, include: The target sensor component, wherein the insulating layer is further used to isolate the target sensor component from the temperature sensor component and to isolate the target sensor component from the pressure sensor component.

7. A device for determining the thermal safety performance index of a battery, characterized in that, include: The acquisition module is used to acquire the target electrical signal and target optical signal corresponding to the target battery. The target electrical signal is acquired by a temperature sensor component in the integrated sensor, and the target optical signal is acquired by a pressure sensor component in the integrated sensor. The temperature sensor component and the pressure sensor component are isolated by an insulating layer. The temperature sensor component includes a thermocouple probe and thermocouple leads. The thermocouple probe is connected to the thermocouple leads and is connected to a controller via the thermocouple leads. The thermocouple probe is also connected to the target battery. The thermocouple probe includes portions made of different conductor materials. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is connected to the controller via the optical fiber. The pressure sensor cavity is also connected to the target battery. The first determining module is used to determine the target temperature information based on the target electrical signal and the target pressure information based on the target optical signal; The second determining module is used to determine the thermal safety performance index of the target battery based on the target temperature information and the target pressure information.

8. A system for determining the thermal safety performance index of a battery, characterized in that, include: It integrates sensors, batteries, and controllers, among which... The integrated sensor includes a temperature sensor component, a pressure sensor component, and an insulating layer. The insulating layer is used to isolate the temperature sensor component from the pressure sensor component. The temperature sensor component includes a thermocouple probe and thermocouple leads. The thermocouple probe is connected to the thermocouple leads and is used to connect to the controller via the thermocouple leads. The thermocouple probe is also used to connect to the battery. The thermocouple probe includes different conductor material portions to acquire electrical signals. The electrical signals differ at the connection areas of the different material portions due to different temperature differences, resulting in different thermoelectric potentials. The pressure sensor component includes a pressure sensor cavity and an optical fiber. The pressure sensor cavity is connected to the optical fiber and is used to connect to the controller via the optical fiber. The pressure sensor cavity is also used to connect to the battery. The pressure sensor cavity is a cavity composed of two reflective surfaces to acquire optical signals. The optical signals differ due to different refractive indices of the gas within the cavity under different pressures, causing different wavelength shifts in the interference spectrum. The controller is used to acquire the target electrical signal and target optical signal corresponding to the target battery; determine the target temperature information based on the target electrical signal, and determine the target pressure information based on the target optical signal; and determine the thermal safety performance index of the target battery based on the target temperature information and the target pressure information.

9. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method for determining the thermal safety performance index of a battery as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the method for determining the thermal safety performance index of a battery as described in any one of claims 1 to 4.

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