Battery thermal runaway monitoring system and method, vehicle and computer readable storage medium

Abstract

The invention relates to a battery thermal runaway monitoring system and method, a vehicle and a computer readable storage medium. The system comprises thermistors, a power supply, a data acquisition module and a processor, a battery comprises a plurality of battery monomers, the surface of each battery monomer is provided with a thermistor, all the thermistors are connected in parallel to form a thermistor loop, one end of the thermistor loop is connected to the positive electrode of the power supply, and the other end of the thermistor loop is connected to a divider resistor. A parallel node formed by connecting the thermistors in parallel is determined as a voltage sampling point of the thermistor loop through connecting the divider resistor to the negative electrode of the power supply; and verifying the sampling voltage of the voltage sampling point at least comprising the thermistor loop and the battery monomer temperature of each battery monomer to obtain a comparison result of the battery parameters, and performing thermal runaway analysis according to the comparison result to determine the thermal runaway data of each battery monomer. By adopting the system, effective and reliable battery thermal runaway monitoring and early-warning battery thermal runaway monitoring can be realized.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery thermal runaway monitoring system, method, vehicle and computer-readable storage medium. Background Art

[0002] With the popularity of electric vehicles, the safety of electric vehicles has attracted more and more attention from the public. The power battery of an electric vehicle stores a lot of energy. Once thermal runaway occurs, it may cause battery fire, explosion and other accidents that endanger the safety of personnel. Therefore, the safety of power batteries has become the focus of attention.

[0003] The importance of monitoring the power battery of electric vehicles lies in ensuring that the battery is always in a safe operating state, improving the battery's service life and performance, and ensuring the overall operating efficiency and safety of the vehicle. Battery thermal runaway warning is an important part of battery safety protection. Therefore, effective and reliable monitoring and warning of battery thermal runaway are required. Summary of the invention

[0004] Based on this, it is necessary to provide a battery thermal runaway monitoring system, method, vehicle, computer-readable storage medium and computer program product that can achieve effective and reliable battery thermal runaway monitoring and early warning in response to the above technical problems.

[0005] In a first aspect, the present application provides a battery thermal runaway monitoring system, the system comprising a power supply, a data acquisition module and a processor, the battery comprising a plurality of battery cells, each of the battery cells having a thermistor on its surface, the thermistors connected in parallel to form a thermistor loop, one end of the thermistor loop connected to the positive electrode of the power supply, the other end of the thermistor loop connected to a voltage divider resistor, connected to the negative electrode of the power supply through the voltage divider resistor, the parallel node formed by the thermistors in parallel being determined as a voltage sampling point of the thermistor loop; wherein: The data acquisition module is used to acquire battery parameters of the battery; the battery parameters at least include the battery cell temperature of each battery cell and the sampled voltage of the voltage sampling point; The processor is used to verify the battery parameters, obtain comparison results of the battery parameters, perform thermal runaway analysis according to the comparison results, and determine thermal runaway data of each of the battery cells.

[0006] In a second aspect, the present application further provides a battery thermal runaway monitoring method, which is applied to the battery thermal runaway monitoring system in the above embodiment, and the method includes: Acquiring battery parameters of the battery; the battery parameters at least include the sampled voltage of the voltage sampling point and the battery cell temperature of each of the battery cells; Verifying the battery parameters to obtain comparison results of the battery parameters; A thermal runaway analysis is performed according to the comparison result to determine the thermal runaway data of each battery cell.

[0007] In one embodiment, the verifying the battery parameters to obtain the comparison result of the battery parameters includes: Verifying the sampled voltage with a preset voltage condition to obtain a voltage comparison result of the sampled voltage; Verifying the battery cell temperature of each of the battery cells with a preset temperature condition to obtain a temperature comparison result of the battery cell; Accordingly, performing thermal runaway analysis according to the comparison result to determine thermal runaway data of each battery cell includes: A thermal runaway analysis is performed according to the voltage comparison result and the temperature comparison result to determine thermal runaway data of each of the battery cells.

[0008] In one embodiment, the preset voltage condition includes a first preset voltage condition and a second preset voltage condition, and the verifying the sampled voltage with the preset voltage condition to obtain a voltage comparison result of the sampled voltage includes: Verifying the sampled voltage with a first preset voltage condition to obtain a first voltage comparison result of the sampled voltage; and / or The sampled voltage is verified with a second preset voltage condition to obtain a second voltage comparison result of the sampled voltage.

[0009] In one embodiment, the preset temperature condition includes a first preset temperature condition and a second preset temperature condition, and the battery cell temperature of each of the battery cells is verified with the preset temperature condition to obtain a temperature comparison result of the battery cell, including: Verifying the battery cell temperature of each of the battery cells with a first preset temperature condition to obtain a first temperature comparison result of the battery cell; and / or The battery cell temperature of each of the battery cells is verified with a second preset temperature condition to obtain a second temperature comparison result of the battery cell.

[0010] In one embodiment, performing thermal runaway analysis according to the voltage comparison result and the temperature comparison result to determine thermal runaway data of each battery cell includes: When the comparison result is that the battery cell temperature of the battery cell satisfies the first preset temperature condition, and the sampled voltage satisfies the first preset voltage condition, determining that the corresponding first target battery cell has a thermal runaway abnormality, and generating first thermal runaway alarm information; and / or When the comparison result is that the battery cell temperature of the battery cell satisfies the second preset temperature condition and the sampled voltage satisfies the second preset voltage condition, it is determined that the corresponding second target battery cell has thermal runaway, and second thermal runaway alarm information is generated.

[0011] In one embodiment, the method further comprises: Determining an IP address of the first target battery cell or the second target battery cell; The IP address and the first thermal runaway alarm information or the second thermal runaway alarm information corresponding to the IP address are uploaded to a display terminal for display.

[0012] In one embodiment, the method further comprises: Generate control data corresponding to the first thermal runaway warning information or the second thermal runaway warning information, and control the operation of a water pump of a battery thermal management system based on the control data to reduce the battery temperature.

[0013] In one embodiment, the method further comprises: Determine a relative order between the battery cells in the battery, and write an IP address to each battery cell based on the relative order; When it is detected that a replacement battery cell exists in the battery, the IP address of the replacement battery cell is updated.

[0014] In one embodiment, the method further comprises: The connection status of each battery cell is detected, and a real-time warning is issued in case of abnormal connection; wherein the connection status of each battery cell includes whether each battery cell is offline.

[0015] In a third aspect, the present application further provides a vehicle, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the battery thermal runaway monitoring method described in any of the above embodiments when executing the computer program.

[0016] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the battery thermal runaway monitoring method described in any of the above embodiments is implemented.

[0017] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the battery thermal runaway monitoring method described in any of the above embodiments.

[0018] The battery thermal runaway monitoring system, method, vehicle, computer-readable storage medium and computer program product are provided with a thermistor on the surface of each battery cell, and all the thermistors are connected in parallel to form a thermistor loop, that is, a parallel resistor film loop is added, and the voltage of the sampling point of the parallel resistor film loop is determined. There is no need to configure multiple voltage sampling channels to realize the voltage change of the thermistor node corresponding to each battery cell in the battery system. Only one voltage sampling channel is required to detect the voltage at the thermistor parallel node, which saves the sampling channel resources. On this basis, the battery is monitored for thermal runaway according to the voltage change of the thermistor node and the battery cell temperature of each battery cell. This method takes into account the inconsistent characteristics of the temperature rise of the battery under normal conditions and the temperature rise of the battery under thermal runaway conditions, and the degree of change of the resistance value of the thermistor loop under the two conditions is also inconsistent. It solves the problem of false alarm, delayed alarm or non-alarm of thermal runaway caused by the distortion of a single parameter when only a single-dimensional parameter such as the battery temperature itself is used as the judgment condition of the thermal runaway alarm, and improves the accuracy and reliability of the thermal runaway warning. In addition, each battery cell can be accurately monitored to timely warn and discover abnormal problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is an application environment diagram of a battery thermal runaway monitoring system in one embodiment; Figure 2 is a structural block diagram of a battery thermal runaway monitoring system in one embodiment; Figure 3 A connection diagram of a thermistor circuit in one embodiment; Figure 4 A schematic diagram of a process of a battery thermal runaway monitoring method in one embodiment; Figure 5 A schematic diagram of a flow chart of thermal runaway monitoring in one embodiment; Figure 6 A schematic diagram of a flow chart of a battery thermal runaway monitoring method in another embodiment; Figure 7 A structural block diagram of a data acquisition module in one embodiment; Figure 8 A structural block diagram of a data verification module in one embodiment; Fig. 9is a structural block diagram of a central database in an embodiment; Fig.10 is a structural block diagram of a real-time communication module in one embodiment; Fig.11 is a structural block diagram of an access status monitoring module in an embodiment; Fig.12 is a structural block diagram of a battery thermal runaway monitoring system in one embodiment; Fig.13 FIG. 1 is a diagram showing the internal structure of a vehicle in one embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0023] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two).

[0027] At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are widely used in energy storage power systems, electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0028] The importance of monitoring power batteries lies in ensuring that the batteries are always in a safe operating state and improving the battery's service life and performance. For example, power batteries are used in electric vehicles. Monitoring power batteries can improve the battery's service life and performance, as well as ensure the vehicle's overall operating efficiency and safety, or promptly warn passengers when a battery failure occurs to ensure personnel safety. Thermal runaway warnings are an important part of battery safety protection. ‌By monitoring the key parameters of the battery, you can understand the battery's status in real time and prevent potential problems, thereby improving the vehicle's reliability and the user's driving experience‌. The state and life of the power battery largely determine the performance of the vehicle, so it is necessary to implement effective management, monitoring and early warning of electric vehicle battery packs.

[0029] Temperature is a very critical parameter in judging battery thermal runaway. If the internal temperature of the battery is higher than a certain threshold, thermal runaway will occur. The abnormal rise in battery temperature is a direct reflection of battery thermal runaway, so many battery thermal runaway warning systems are equipped with temperature sensors to monitor the battery temperature. When the temperature is greater than the preset value, an alarm is issued or protective measures are implemented. When a battery has thermal runaway, the battery temperature parameters will show abnormal changes. Monitoring the battery temperature can promptly detect and respond to thermal runaway problems to ensure the safety of personnel and assets. Therefore, when the detected battery temperature changes abnormally, whether the situation is true or not plays a vital role in the battery pack thermal runaway alarm.

[0030] In the related technology, the battery temperature monitoring solution is mostly to use temperature sensors glued to the surface of the battery shell. As the vehicle travels for a long time or passes through bad road conditions, some temperature sensors are prone to problems such as loose bonding, failure of the connection between the temperature sensor and the thermal runaway warning controller, or abnormality of the temperature sensor itself caused by battery thermal runaway. At this time, the temperature change value cannot accurately reflect the actual temperature of the battery, which may easily lead to false alarms of thermal runaway warnings.

[0031] Therefore, in order to address the technical problems of inaccurate and unreliable battery thermal runaway monitoring, a battery thermal runaway monitoring system is proposed. The system sets a thermistor on the surface of each battery cell, connects all the thermistors in parallel to form a thermistor loop, determines the voltage change of the voltage sampling point corresponding to the sampling point of the parallel resistor film loop, and monitors the battery for thermal runaway based on the voltage change of the thermistor node and the battery cell temperature of each battery cell.

[0032] The battery thermal runaway monitoring system disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. In this way, it can solve the problem of false alarm, delayed alarm or no alarm of thermal runaway caused by the distortion of a single parameter when only a single-dimensional parameter such as the battery temperature itself is used as the thermal runaway alarm judgment condition, thereby improving the accuracy and reliability of thermal runaway warning.

[0033] The battery thermal runaway monitoring system provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the vehicle end 102 communicates with the battery thermal runaway monitoring system 104 through a network. The data storage system can store data that the battery thermal runaway monitoring system 104 needs to process. The data storage system can be integrated on a server, or placed on a cloud or other network server.

[0034] In an exemplary embodiment, Figure 2 As shown, a battery thermal runaway monitoring system is provided, the system includes a power supply, a data acquisition module and a processor, the battery includes a plurality of battery cells, each battery cell surface is provided with a thermistor, all the thermistors are connected in parallel to form a thermistor loop, one end of the thermistor loop is connected to the positive electrode of the power supply, the other end of the thermistor loop is connected to a voltage divider resistor, connected to the negative electrode of the power supply through the voltage divider resistor, and the parallel node formed by the thermistors in parallel is determined as the voltage sampling point of the thermistor loop; it can be understood that the system may also include a battery and a thermistor, wherein: The data acquisition module is used for battery parameters of the battery, and the battery parameters at least include the battery cell temperature of each battery cell and the sampled voltage of the voltage sampling point.

[0035] Wherein, the battery includes a plurality of battery cells connected in series or in parallel; the thermistors on each battery cell may be the same, such as the same specifications and the same resistance. The thermistor may be an NTC resistor film, which is wrapped and attached to the surface of each battery cell, and each NTC resistor film is connected in parallel. It is a negative temperature coefficient thermistor film. When a certain temperature is exceeded, its resistance value decreases with the increase of temperature, and the total resistance value of the corresponding circuit decreases. Furthermore, if one or more NTC resistor films are broken in the parallel NTC resistor film loop, the total resistance value of the parallel NTC resistor film loop will increase, and the corresponding sampling voltage will decrease. Based on this feature, it can be judged whether there is a NTC resistor film break in the parallel NTC resistor film loop; and in this case, the total resistance value of the NTC resistor film loop increases, which is opposite to the situation that the total resistance value of the NTC resistor film loop decreases due to the increase in temperature when the battery is in thermal runaway, and the judgment of thermal runaway will not be interfered with by the existence of NTC resistor film break.

[0036] It should be noted that the NTC resistor film is wrapped and covered on the surface of the battery shell, which is not easy to loosen, has a large coverage area, and is not easily affected by local deviations. Compared with the related technology, the temperature sensor is glued or measures the temperature of a certain point on the surface of the battery shell. There are limitations in temperature detection, the glue is easy to loosen, or the temperature of a certain point is detected as the temperature of a small area on the shell. This method can better ensure the reliability of the data.

[0037] The power supply is used to power the various components in the battery thermal runaway monitoring system and is connected through a wiring harness; a certain voltage can also be applied to the voltage divider resistor (i.e., fixed resistor) and the NTC resistor film. For example, the power supply is a 12V power supply used to power the various modules in this system and is connected through a wiring harness; a certain voltage can be applied to the fixed resistor and the NTC resistor film. Further, the connection diagram of the thermistor circuit can be as follows Figure 3 As shown, each battery cell is provided with an NTC resistor film, such as, battery cell 1 is provided with an NTC resistor film 1, battery cell 2 is provided with an NTC resistor film 2, and battery cell n is provided with an NTC resistor film n. Each single battery cell is provided with a temperature sampling point, such as temperature sampling point 1, temperature sampling point 2, and temperature sampling point Tn. The total resistance of the NTC resistor film loop after parallel connection is R2. One end of the loop is connected to the positive pole loop of the 12V power supply, and the other end is connected to the voltage dividing resistor, that is, the fixed resistor R1. One end of the fixed resistor is connected to the NTC resistor film, and the other end is connected to the negative pole loop of the 12V power supply, which is used to solidify a voltage detection point V', which can also be called the voltage sampling point V', so as to judge the reliability and authenticity of the battery temperature change according to the V' voltage.

[0038] The battery parameters can be determined by the data acquisition module converting and processing the battery parameter signals collected by the sensor. The specific signal conversion processing method can be implemented by existing methods and will not be elaborated here. The sensor may include but is not limited to a temperature sensor and a voltage sensor. The voltage sensor may include a first voltage sensor arranged between a fixed resistor and an NTC resistor film, and the first voltage sensor is used by the data acquisition module to perform real-time detection of the sampled voltage V' of the NTC resistor film parallel circuit node; and also includes a second voltage sensor arranged on the aluminum bar welded on the battery cell pole, and the second voltage sensor is used to perform real-time detection of the voltage of each battery cell, and can determine whether the battery cell has abnormal conditions such as overcharge or over discharge. The other end of the second voltage sensor is connected to the data acquisition module. The second voltage sensor and the battery cell may have a one-to-one correspondence.

[0039] The temperature sensor can be arranged on the upper surface of each battery cell, and the data acquisition module is used to detect the temperature of each battery cell in real time to obtain the battery cell temperature of each battery cell; the other end of the temperature sensor is connected to the data acquisition module.

[0040] The processor is used to verify the battery parameters, obtain the comparison results of the battery parameters, perform thermal runaway analysis according to the comparison results, and determine the thermal runaway data of each battery cell.

[0041] The above-mentioned battery thermal runaway monitoring system sets a thermistor on the surface of each battery cell, connects all the thermistors in parallel to form a thermistor loop, and determines the voltage of the sampling point of the parallel resistor film loop. There is no need to configure multiple voltage sampling channels to realize the voltage change of the thermistor node corresponding to each battery cell in the battery system. Only one voltage sampling channel is required to detect the voltage at the thermistor parallel node, which saves the sampling channel resources. On this basis, the battery is monitored for thermal runaway according to the voltage change of the thermistor node and the battery cell temperature of each battery cell. This method takes into account the inconsistent characteristics of the temperature rise of the battery under normal conditions and the temperature rise of the battery under thermal runaway conditions, and the degree of change of the resistance value of the thermistor loop under the two conditions is also inconsistent. It solves the problem of false alarm, delayed alarm or non-alarm of thermal runaway caused by the distortion of a single parameter when only a single-dimensional parameter such as the battery temperature itself is used as the judgment condition of the thermal runaway alarm, and improves the accuracy and reliability of the thermal runaway warning. In addition, each battery cell can be accurately monitored to timely warn and discover abnormal problems.

[0042] In an exemplary embodiment, Figure 4 As shown, a battery thermal runaway monitoring method is provided, which can be applied to the above-mentioned battery thermal runaway monitoring system, including the following steps 402 to 406. Among them: Step 402 : acquiring battery parameters of the battery, where the battery parameters at least include the battery cell temperature of each battery cell and the sampled voltage of the voltage sampling point.

[0043] Among them, the battery parameters at least include the battery cell temperature of each battery cell and the sampling voltage of the voltage sampling point. Correspondingly, each battery cell also has corresponding battery parameters, and the battery parameters of each battery cell may include battery cell temperature, battery cell voltage and current, etc. The battery includes multiple battery cells connected in series or in parallel; the thermistors on each battery cell may be the same, such as the same specifications and the same resistance. The thermistor may be, but is not limited to, an NTC resistor film, which is wrapped and attached to the surface of each battery cell, and each NTC resistor film is connected in parallel. It is a negative temperature coefficient thermistor film. When the temperature exceeds a certain temperature, its resistance value decreases as the temperature increases, and the total resistance value of the corresponding circuit decreases. In the case where the thermistor is an NTC resistor film, the corresponding thermistor circuit can be called a parallel resistor film circuit or an NTC resistor film circuit, and accordingly, the sampling voltage is the voltage of the sampling point of the parallel resistor film circuit or the NTC resistor film circuit.

[0044] Furthermore, if one or more NTC resistors are broken in the parallel NTC resistor film loop, the total resistance of the parallel NTC resistor film loop will increase, and the corresponding sampling voltage will decrease. Based on this feature, it can be determined whether the parallel NTC resistor film loop has an NTC resistor film break; and in this case, the total resistance of the NTC resistor film loop increases, which is the opposite of the total resistance of the NTC resistor film loop decreasing due to the temperature rise during battery thermal runaway. The judgment of thermal runaway will not be interfered with by the existence of NTC resistor film break. Each battery cell has a corresponding and unique IP address. Based on each battery parameter, the IP address of the corresponding battery cell can be located. It can also be understood that there is a corresponding relationship between the battery parameter and the IP address.

[0045] Among them, according to this feature, it can be judged whether there is a NTC resistor film disconnection in the parallel NTC resistor film loop: when the resistor film with the same resistance value specification is used, according to the characteristics of the parallel resistor, for example, a total of n resistors are connected in parallel, and after m resistors are disconnected, the total resistance of the parallel circuit increases to n / (nm) times the original total resistance. The normal initial value of the sampling voltage V' in this embodiment = R1 / (R1+R2)×power supply voltage; if there is a disconnection of one resistor film, V' is reduced to: R1 / (R1+R2(n / (n-1)))×power supply voltage; if there are m resistor films disconnected, V' is reduced to: R1 / (R1+R2(n / (nm)))×power supply voltage.

[0046] That is to say, if one or more NTC resistor films are broken in the parallel NTC resistor film loop, the total resistance of the parallel NTC resistor film loop will increase and the corresponding sampling voltage will decrease. Based on this feature, it can be determined whether there is a NTC resistor film break in the parallel NTC resistor film loop; the V' change of one resistor film break can be taken as the judgment threshold of the resistor film break fault. For example, if V'≤R1 / (R1+R2(n / (n-1)))×power supply voltage, it can be determined that there is an NTC resistor film break.

[0047] It should be noted that the NTC resistor film is wrapped and covered on the surface of the battery shell, which is not easy to loosen, has a large coverage area, and is not easily affected by local deviations. Compared with the related technology, the temperature sensor is glued or measures the temperature of a certain point on the surface of the battery shell. There are limitations in temperature detection, the glue is easy to loosen, or the temperature of a certain point is detected as the temperature of a small area on the shell. This method can better ensure the reliability of the data.

[0048] The power supply of the battery thermal runaway monitoring system can power each component of the system and connect them through a wiring harness; it can also apply a certain voltage to the voltage divider resistor (i.e., fixed resistor) and the NTC resistor film. For example, the power supply is a 12V power supply used to power each module in this system and connected through a wiring harness; and it can apply a certain voltage to the fixed resistor and the NTC resistor film. Further, the connection diagram of the thermistor circuit can be as follows Figure 3 As shown, the total resistance of the parallel NTC resistor film loop is R2, one end of the loop is connected to the 12V power supply positive loop, and the other end is connected to the voltage divider resistor, that is, the fixed resistor R1, one end of the fixed resistor is connected to the NTC resistor film, and the other end is connected to the 12V power supply negative loop, which is used to solidify a voltage detection point V', so as to judge the reliability and authenticity of the battery temperature change according to the V' voltage.

[0049] The battery parameters can be determined by converting and processing the battery parameter signals collected by the sensor. The specific signal conversion processing method can be implemented by existing methods and will not be elaborated here. The sensor may include but is not limited to a temperature sensor and a voltage sensor. The voltage sensor may include a first voltage sensor arranged between a fixed resistor and an NTC resistor film, and the first voltage sensor is used for the data acquisition module to perform real-time detection of the sampled voltage V' of the node of the NTC resistor film parallel circuit; and also includes a second voltage sensor arranged on an aluminum bar welded on the battery cell pole, and the second voltage sensor is used to perform real-time detection of the voltage of each battery cell, and can determine whether the battery cell has abnormal conditions such as overcharge or over-discharge. The other end of the second voltage sensor is connected to the data acquisition module. The second voltage sensor and the battery cell may be in a one-to-one correspondence. It can be understood that there may be multiple batteries, and obtaining the battery parameters of the battery may be extracted from the acquired summary battery parameters.

[0050] The temperature sensor may be arranged on the upper surface of each battery cell, and the temperature signal of each battery cell collected by the temperature sensor may be detected in real time to obtain the battery cell temperature of each battery cell.

[0051] Step 404, verify the battery parameters to obtain a comparison result of the battery parameters.

[0052] Among them, verifying the battery parameters can be understood as comparing the battery parameters with the preset standard values. Battery parameters include multiple types of battery parameters, which can be sampled voltages and battery cell temperatures of each battery cell. There is at least one parameter threshold for each type of battery parameter. In the case of thermal runaway analysis of the battery, each battery parameter can be compared with the corresponding parameter threshold (i.e., the preset standard value) to determine whether the corresponding preset battery parameter conditions are met. Different preset battery parameter conditions are used to determine different levels of thermal runaway alarm conditions for batteries or battery cells. The parameter threshold is determined based on different levels of thermal runaway alarm conditions. For example, it can include a parameter threshold corresponding to a first-level thermal runaway alarm and a parameter threshold corresponding to a second-level thermal runaway alarm.

[0053] The comparison results may include comparison results of different battery parameters, such as voltage comparison results and battery comparison results. The voltage comparison result may be the result obtained by comparing the sampled voltage with the corresponding voltage threshold (i.e., a preset voltage standard value), and the battery comparison result may be the result obtained by comparing the battery cell current of each battery cell with the current threshold (i.e., a preset current standard value).

[0054] Exemplarily, the battery cell temperature and the sampled voltage of each battery cell are compared with preset standard values ​​corresponding to different levels of thermal runaway alarms to obtain corresponding voltage comparison results and battery comparison results.

[0055] Step 406 , performing thermal runaway analysis based on the comparison result to determine thermal runaway data of each battery cell.

[0056] Exemplarily, the voltage V' at the sampling point of the resistance film loop and the temperature of each battery cell are obtained, the sampled voltage is verified with the preset voltage condition, and a voltage comparison result of the sampled voltage is obtained; the battery cell temperature of each battery cell is verified with the preset temperature condition, and a temperature comparison result of the battery cell is obtained, and a thermal runaway analysis is performed based on the voltage comparison result and the temperature comparison result, and based on the preset thermal runaway conditions satisfied by the voltage comparison result and the temperature comparison result, the thermal runaway condition of each battery cell is determined, and then the thermal runaway condition of the battery is obtained.

[0057] The above-mentioned battery thermal runaway monitoring method, by setting a thermistor on the surface of each battery cell, connecting all the thermistors in parallel to form a thermistor loop, determining the sampling point of the parallel resistor film loop and the voltage sampling point of the sampling point of the parallel resistor film loop, does not need to configure multiple voltage sampling channels to realize the voltage change of the thermistor node corresponding to each battery cell in the battery system, and only one voltage sampling channel is required to detect the voltage at the thermistor parallel node, saving the sampling channel resources. On this basis, the battery is monitored for thermal runaway according to the voltage change of the sampling node of the thermistor loop and the battery cell temperature of each battery cell. This method takes into account the inconsistent characteristics of the temperature rise of the battery under normal conditions and the temperature rise of the battery under thermal runaway conditions, and the situation that the degree of change of the resistance value of the thermistor loop under the two conditions is also inconsistent, and solves the problem of false alarm, delayed alarm or non-alarm of thermal runaway caused by the distortion of a single parameter when only a single dimensional parameter such as the battery temperature itself is used as the judgment condition of the thermal runaway alarm, and improves the accuracy and reliability of the thermal runaway warning. In addition, each battery cell can be accurately monitored to timely warn and discover abnormal problems.

[0058] Compared with the related art that can only monitor the battery as a whole but cannot accurately monitor the battery cells, in an exemplary embodiment, the relative order between the battery cells in the battery is determined, and the IP address of each battery cell is written based on the relative order; when it is detected that a battery cell has been replaced in the battery, the IP address of the replaced battery cell is updated.

[0059] Among them, the IP address of each battery cell is unique. When it is detected that a battery cell has been replaced in the battery, the IP address of the replaced battery cell can be deleted and a new IP address of the replaced battery cell can be set, or the IP address of the replaced battery cell can be set to the IP address of the replaced battery cell.

[0060] By setting the IP address of each battery cell, the status of each battery cell can be accurately obtained. For example, in the case of thermal runaway monitoring, precise monitoring can be achieved, and the connection status of each battery cell can be monitored in real time.

[0061] In an exemplary embodiment, each battery parameter is verified to obtain a comparison result of each battery parameter, which may be obtained by comparing each battery parameter with a preset standard value, and specifically may be: The sampled voltage is verified with the preset voltage condition to obtain a voltage comparison result of the sampled voltage; the battery cell temperature of each battery cell is verified with the preset temperature condition to obtain a temperature comparison result of the battery cell; accordingly, a thermal runaway analysis is performed based on the voltage comparison result and the temperature comparison result to determine the thermal runaway data of each battery cell.

[0062] It should be noted that the sampling voltage here is the voltage of the sampling point of the parallel resistance film loop, that is, the sampling voltage of the voltage sampling point of the thermistor loop. The preset standard value may include a voltage parameter threshold of a preset voltage condition and a temperature parameter threshold of a preset temperature condition. The preset voltage condition includes a first preset voltage condition and a second preset voltage condition. Correspondingly, the voltage parameter threshold includes at least one of a first voltage parameter threshold of the first preset voltage condition and a second voltage parameter threshold of the second preset voltage condition. The preset temperature condition includes a first preset temperature condition and a second preset temperature condition. The corresponding temperature parameter threshold includes at least one of a first temperature parameter threshold of the first preset temperature condition and a second temperature parameter threshold of the second preset temperature condition.

[0063] The first voltage parameter threshold may include a first voltage threshold and a first voltage change rate, the first temperature parameter threshold may include a first temperature threshold, a first temperature change rate and a first temperature difference threshold, and the first temperature difference threshold may be a temperature difference threshold corresponding to the difference between two temperatures among all battery cell temperatures, for example, a temperature difference threshold corresponding to the difference between the highest temperature and the lowest temperature.

[0064] The second voltage parameter threshold includes a second voltage threshold and a second voltage change rate, and the second temperature parameter threshold includes a second temperature threshold, a second temperature change rate, and a second temperature difference threshold. The second temperature difference threshold may be a temperature difference threshold corresponding to the difference between two temperatures among all battery cell temperatures, for example, a temperature difference threshold corresponding to the difference between the highest temperature and the lowest temperature. The first voltage parameter threshold is less than the second voltage parameter threshold, and the first temperature parameter threshold is less than the second temperature parameter threshold.

[0065] The first preset voltage condition and the first preset temperature condition can be used to determine whether the battery has a first-level thermal runaway, and the second preset voltage condition and the second preset temperature condition can be used to determine whether the battery has a second-level thermal runaway.

[0066] Exemplarily, the sampling voltage at the sampling point of the parallel resistance film loop is verified with the preset voltage condition to obtain a voltage comparison result of the sampling voltage; the battery cell temperature of each battery cell is verified with the preset temperature condition to obtain a temperature comparison result of the battery cell, and when it is determined based on the voltage comparison result and the temperature comparison result that the preset thermal runaway condition is met, the target thermal runaway alarm level corresponding to the preset thermal runaway condition is determined, and the battery is controlled in the same way based on the target thermal runaway alarm level to ensure battery safety.

[0067] Further, in an exemplary embodiment, the preset voltage condition may include a first preset voltage condition and a second preset voltage condition, and the sampled voltage is verified with the preset voltage condition to obtain a voltage comparison result of the sampled voltage, which may be: The sampled voltage is verified with a first preset voltage condition to obtain a first voltage comparison result of the sampled voltage; and / or the sampled voltage is verified with a second preset voltage condition to obtain a second voltage comparison result of the sampled voltage.

[0068] The preset temperature condition may include a first preset temperature condition and a second preset temperature condition. The battery cell temperature of each battery cell is verified with the preset temperature condition to obtain a temperature comparison result of the battery cell, which may be: Verify the battery cell temperature of each battery cell with a first preset temperature condition to obtain a first temperature comparison result of the battery cell; and / or verify the battery cell temperature of each battery cell with a second preset temperature condition to obtain a second temperature comparison result of the battery cell.

[0069] Accordingly, in an exemplary embodiment, performing thermal runaway analysis according to the voltage comparison result and the temperature comparison result to determine the thermal runaway data of each battery cell includes: When the comparison result shows that the battery cell temperature of the battery cell satisfies the first preset temperature condition and the sampled voltage satisfies the first preset voltage condition, determining that the corresponding first target battery cell has a thermal runaway abnormality, and generating first thermal runaway alarm information; and / or When the comparison result is that the battery cell temperature of the battery cell meets the second preset temperature condition and the sampled voltage meets the second preset voltage condition, it is determined that the corresponding second target battery cell has thermal runaway, and second thermal runaway alarm information is generated.

[0070] Among them, the first preset temperature condition may include multiple first sub-preset temperature conditions, and the first sub-preset temperature condition may be that the temperature of any battery cell is greater than or equal to the first temperature threshold, and the temperature difference between the state latch first time length, the highest battery cell temperature and the lowest battery cell temperature is greater than or equal to the first temperature difference threshold, and the temperature change rate of any battery cell within the second time length or the first preset time length is greater than or equal to the first temperature change rate. If it is greater than or equal to the first temperature change rate, it indicates that the battery cell heats up too quickly.

[0071] The first voltage preset condition may include multiple first sub-voltage preset conditions. The first sub-voltage preset condition may be that the sampled voltage is greater than or equal to the first voltage threshold, and the change rate of the sampled voltage within the third time period or the second preset time period is greater than or equal to the first voltage change rate.

[0072] The second preset temperature condition may include multiple second sub-preset temperature conditions, and the second sub-preset temperature condition may be that the temperature of any battery cell is greater than or equal to the second temperature threshold and the state is latched for a fourth time period, the temperature difference between the highest battery cell temperature and the lowest battery cell temperature is greater than or equal to the second temperature difference threshold and the state is maintained for a fifth time period, or the temperature change rate of any battery cell within the third preset time period is greater than or equal to the second temperature change rate.

[0073] The second voltage preset condition may include multiple second sub-voltage preset conditions, and the second sub-voltage preset condition may be that the sampled voltage is greater than or equal to the second voltage threshold and the state is maintained for the sixth time period, or the rate of change of the sampled voltage within the fourth preset time period is greater than or equal to the second voltage change rate. It should be noted that the first time period, the second time period, the third time period, the fourth time period, the fifth time period and the sixth time period can be set according to actual needs, and can be set to 0 or a value greater than 0. When it is greater than 0, the accuracy and reliability of the data are considered. For example, the latched state takes into account the battery over-discharge or the external device preheating, which may cause external cooling. The first or fourth time period of latching takes into account the false alarm rate and timeliness rate, and the second or fifth time period is maintained to take into account the data reliability.

[0074] Exemplarily, for each battery, when the comparison result is that the battery cell temperature of any battery cell in each battery satisfies any first sub-preset temperature condition in the first preset temperature condition, and the sampled voltage satisfies any first sub-voltage preset condition in the first voltage preset condition, it is determined that the corresponding first target battery cell has a thermal runaway abnormality, and a first thermal runaway alarm message is generated; and / or, when the comparison result is that the battery cell temperature of the battery cell satisfies any second sub-preset temperature condition in the second preset temperature condition, and the sampled voltage satisfies any second sub-voltage preset condition in the second preset voltage condition, it is determined that the corresponding second target battery cell has a thermal runaway, and a second thermal runaway alarm message is generated.

[0075] In the above embodiment, based on the inconsistent characteristics of the temperature rise of the battery under normal conditions and the temperature rise of the battery under thermal runaway conditions, the degree of change of the total resistance value of the NTC resistor film circuit in the two conditions is also inconsistent. Further judgment is made based on the voltage change difference of the corresponding voltage sampling points in the two conditions and the battery cell temperature to solve the problem of false alarm, delayed alarm or no alarm of thermal runaway caused by the distortion of a single parameter such as the battery's own temperature when only a single parameter is used as the thermal runaway alarm judgment condition, thereby improving the accuracy of thermal runaway warning.

[0076] It can be understood that, based on the above embodiment, when it is determined that the battery is in thermal runaway, the IP of the faulty battery can be further output to achieve the effect of accurately locating the battery in thermal runaway.

[0077] In an exemplary embodiment, when battery thermal runaway is determined, the IP address of the first target battery cell or the second target battery cell is determined; the IP address and the first thermal runaway alarm information or the second thermal runaway alarm information corresponding to the IP address are uploaded to the display terminal for display.

[0078] Specifically, the real-time communication module based on the vehicle side can display the battery monitoring data and thermal runaway warning information on the terminal in the vehicle, and take safety measures for the battery, such as operating the thermal management system to control battery cooling and / or sound and light alarms. It can also be uploaded to the host computer or enterprise cloud platform, and cooperate with the background terminal to conduct a full range of vehicle battery data analysis and background warnings, and notify the processing terminal to respond in time to ensure the safety of passengers.

[0079] In order to achieve two-level control of the process of thermal runaway of the battery, low-level early abnormal warning and high-level complete thermal runaway warning are carried out to achieve the danger classification of the battery thermal runaway process and early warning. In an exemplary embodiment, control data corresponding to the first thermal runaway warning information or the second thermal runaway warning information can also be generated, and the water pump of the battery thermal management system is controlled based on the control data to reduce the battery temperature.

[0080] Among them, the first thermal runaway alarm information can be understood as a level 1 thermal runaway alarm, that is, a thermal runaway pre-alarm state. In this state, thermal runaway anomalies may occur, but it cannot be defined as a true battery thermal runaway. It may also be an abnormal temperature rise caused by a slight over-discharge of the battery or other components other than the battery cell. The degree of change in the battery cell temperature and the sampling point voltage exceeds the normal battery operating range, but the degree of excess is relatively low. If discovered in time, the water pump can be used to drive the water circulation of the battery thermal management system to cool the battery. The battery temperature may be controlled and will not continue to heat up and cause battery thermal runaway problems.

[0081] The second thermal runaway warning information can be understood as a secondary thermal runaway warning, that is, there is an alarm state of battery thermal runaway. This state indicates that a battery cell in the battery pack has already experienced a dangerous state of thermal runaway. At this time, the battery temperature rise is abnormally obvious, and the degree of change in the battery cell temperature and the sampling point voltage significantly exceeds the normal battery operating range. An audible and visual warning, text reminder, and host computer or cloud platform warning should be issued on the vehicle side, and the battery thermal management system should be run to cool the battery to suppress the spread of thermal runaway.

[0082] Exemplarily, if the comparison result is that any first sub-voltage preset condition in the first voltage preset condition is satisfied and any first sub-current preset condition in the first current preset condition is satisfied, it is determined that the battery is in a thermal runaway pre-warning state, i.e., a low-level thermal runaway warning, and the first thermal runaway warning information is generated, and the IP address of the first target battery cell corresponding to the first thermal runaway warning information is determined. Further, the central processing unit sends a low-level warning signal (i.e., the first thermal runaway warning information) to the host computer or cloud platform, and the host computer or cloud platform performs a background low-level warning and displays the IP address of the first target battery cell corresponding to the thermal runaway pre-warning, and the central processing unit requests the thermal management control module to generate control data, and controls the operation of the water pump of the battery thermal management system based on the control data to cool the battery.

[0083] If the comparison result satisfies any second sub-voltage preset condition in the second voltage preset condition and satisfies any second sub-current preset condition in the second current preset condition, it is determined that the battery is in a thermal runaway pre-warning state, i.e., a low-level thermal runaway warning, and a second thermal runaway warning message is generated, and the IP address of the second target battery cell corresponding to the second thermal runaway warning message is determined. Furthermore, the central processing unit sends a high-level warning signal to the outside, performs an audible and visual warning and a text reminder on the terminal display module, and the host computer or cloud platform performs a background high-level warning and displays the IP address of the second target battery cell corresponding to the thermal runaway, and the central processing unit requests the battery thermal management system from the thermal management control module, generates control data, and controls the battery thermal management system water pump to operate based on the control data to cool the battery. The battery thermal management system water pump can operate at full power.

[0084] Further, in an exemplary embodiment, when the temperature of the battery cell satisfies the first preset temperature condition and the sampled voltage satisfies the first preset voltage condition, it is determined that the corresponding battery cell has a thermal runaway abnormality, and the first thermal runaway alarm information is generated, which may be: When the temperature of any battery cell rises abnormally and exceeds the preset low-level battery temperature alarm threshold (the temperature of any battery cell is greater than or equal to the first temperature threshold a1°C, the state is latched for the first time period of 5 minutes, or the temperature difference between the highest and lowest battery cells Tmax-Tmin ≥ the first temperature difference threshold b1°C, the state lasts for the second time period of 30 seconds, or the temperature of any battery cell rises too fast within 30 seconds of the first preset time period, that is, the temperature change rate dT / dt ≥ the first temperature change rate c°C / s), and the voltage V' change at the connection node between the fixed resistor and the NTC resistor film also exceeds the preset low-level alarm threshold (that is, the sampling voltage V' ≥ the first voltage threshold x1V, the state lasts for the third time period of 10 seconds or the change rate within 10 seconds of the second preset time period is greater than or equal to the first voltage change rate, that is, dV' / dt ≥ y1V / s), the central processing unit sends a low-level alarm signal to the outside, the host computer or cloud platform performs a background low-level warning and displays the battery IP corresponding to the thermal runaway pre-warning, and requests the thermal management control module to operate the battery thermal management system water pump to cool the battery.

[0085] When the battery cell temperature of the battery cell meets the second preset temperature condition and the sampled voltage meets the second preset voltage condition, it is determined that the corresponding battery cell has thermal runaway, and the second thermal runaway alarm information is generated, which may be: When the temperature of any battery cell rises abnormally and significantly exceeds the preset high-level battery temperature alarm threshold (the temperature of any battery cell is greater than or equal to the second temperature threshold a1+z1℃, the state is latched for the fourth time period of 5min, or the temperature difference between the highest and lowest battery cells is greater than or equal to the second temperature difference threshold and the state is maintained for the fifth time period, that is, Tmax-Tmin≥the second temperature difference threshold b1+z2℃, the state lasts for the fifth time period of 15s, or the temperature of any battery cell rises too fast within 15s of the third preset time period, and the temperature change rate is greater than or equal to the second temperature change rate, that is, dT / dt≥the second temperature change rate c1+z3℃ / s), and the voltage V' at the connection node between the fixed resistor and the NTC resistor film also changes If the preset high-level alarm threshold is exceeded (the sampling voltage is greater than or equal to the second voltage threshold and the state is maintained for the sixth time period, that is, V'≥the second voltage threshold x1+z4V, and the state lasts for the sixth time period of 10s or the rate of change of the sampling voltage within the fourth preset time period of 10s is greater than or equal to the second voltage change rate, that is, dV' / dt≥y1+z5V / s), the central processing unit sends a high-level alarm signal to the outside, the terminal display module issues an audible and visual alarm and a text reminder, the host computer or cloud platform issues a background high-level alarm and displays the battery IP corresponding to the thermal runaway, and the central processing unit requests the thermal management control module to operate the battery thermal management system water pump to cool the battery and suppress the spread of thermal runaway.

[0086] It should be noted that under normal circumstances, the temperature rise of battery charging and discharging is relatively low, and there is an operating temperature range. a1 can be a threshold value that slightly exceeds the normal operating temperature range based on a large amount of measured data. For example, it may be caused by an abnormality other than thermal runaway; a1+z1 is another threshold value that greatly exceeds the normal operating temperature, which is a temperature higher than the low level; b1, z2, c1, and z3 are also determined in the same way, so they will not be elaborated here.

[0087] In an exemplary embodiment, a flow chart of thermal runaway monitoring is provided, such as Figure 5 As shown, by acquiring the battery parameters of the battery, the battery cell temperature and sampling voltage of each battery cell are obtained, the battery parameters are verified, and the comparison results of the battery parameters are obtained; when the battery cell temperature meets the first preset temperature condition, and the sampling voltage meets the first voltage preset condition, it is determined that the corresponding battery cell has a thermal runaway abnormality, and the first thermal runaway alarm information and control data are generated, that is, the battery cell temperature of the battery cell meets any first sub-preset temperature condition in the first preset temperature condition, and the sampling voltage meets any first sub-voltage preset condition in the first voltage preset condition, a low-level alarm signal is sent out, the host computer or cloud platform performs a background low-level warning and displays the battery IP corresponding to the thermal runaway pre-alarm, and requests the thermal management control module to operate the battery thermal management system water pump.

[0088] When the battery cell temperature of the battery cell meets the second preset temperature condition and the sampled voltage meets the second preset voltage condition, it is determined that the corresponding battery cell has thermal runaway, and a second thermal runaway alarm message is generated, that is, the battery cell temperature of the battery cell meets any second sub-preset temperature condition in the second preset temperature condition, and the sampled voltage meets any second sub-preset voltage condition in the second preset voltage condition, a high-level alarm signal is sent out, the terminal display module performs sound and light warnings and text reminders, the host computer or cloud platform performs a background high-level warning and displays the battery IP corresponding to the thermal runaway, and requests the thermal management control module to operate the battery thermal management system water pump.

[0089] It is understandable that in the same battery, one battery cell may have a thermal runaway anomaly, generating first thermal runaway alarm information and control data, and another battery cell may have a thermal runaway anomaly, generating second thermal runaway alarm information and corresponding control data.

[0090] In the above embodiment, according to the coupling of the surface temperature of the battery shell, that is, the surface temperature of each battery cell and the voltage variation law mapped by the NTC resistance film loop wrapped and pasted on the battery surface with the temperature variation law, the process of thermal runaway of the battery is controlled at two levels, namely, low-level early abnormal warning and high-level complete thermal runaway warning, so as to realize the hazard classification of the battery thermal runaway process and early warning. Compared with the related technology, it can give a warning before the battery completely thermally runs away. The response time from the occurrence of thermal runaway to the thermal runaway alarm is relatively long, and the time left for the occupants to escape or take countermeasures will be shorter, thereby ensuring safety.

[0091] In an exemplary embodiment, the connection status of each battery cell can also be detected, and a real-time warning can be issued in the event of abnormal connection; wherein the connection status of each battery cell includes whether each battery cell is offline. If a battery cell is offline, the battery management system cannot accurately obtain the battery parameters of the battery cell.

[0092] Specifically, the processor can detect the connection status of each battery cell to determine whether there is data loss or battery disconnection, and / or obtain the IP address of the battery cell to be tested, and locate the corresponding battery cell according to the IP address; the IP address to be tested can be the IP address of a normal battery cell or an abnormal battery cell; an alarm signal is issued when the connection status of the battery cell is abnormal. In addition, the CAN line channel status between the vehicle controller and the various components of the system can also be detected to ensure the stable operation, fault diagnosis, performance monitoring and safety maintenance of the vehicle electronic system.

[0093] Optionally, in an exemplary embodiment, time nodes may be divided according to the battery working time, the collected battery parameters may be backed up, and array processing may be performed on each disk storing data according to the time nodes.

[0094] The time nodes are divided into charging and discharging time. For example, after each charging or discharging, the time nodes are re-divided, and the data used for this charging or discharging is collected and stored separately. Array processing is performed on each disk storing data according to the time node, which can be but not limited to automatically managing data storage, backup, recovery and optimization, ensuring data security and availability, and improving the overall performance of the storage system.

[0095] In an exemplary embodiment, Figure 6 As shown, a battery thermal runaway monitoring method is provided, which can be applied to the above-mentioned battery thermal runaway monitoring system, including the following steps 602 to 616. Among them: Step 602, determining the relative order between the battery cells in the battery, and writing an IP address to each battery cell based on the relative order.

[0096] Step 604: Detect the connection status of each battery cell.

[0097] Specifically, the series-parallel paths between multiple battery cells are detected, and the detection results are sent to the processor; the connection status of each independent battery block is detected to determine whether the battery cell is offline; the IP address under test is obtained; and the corresponding battery is located according to the IP address. If the battery connection is abnormal, the abnormal alarm module will send a connection abnormality alarm signal and a connection abnormality IP address. When the connection is normal, the battery is monitored for thermal runaway.

[0098] Step 606 , obtaining battery parameters of the battery; the battery parameters at least include the sampled voltage of the voltage sampling point and the battery cell temperature of each battery cell.

[0099] Step 608, verify the battery parameters to obtain a comparison result of the battery parameters.

[0100] Step 610 , when the comparison result is that the battery cell temperature of the battery cell satisfies the first preset temperature condition and the sampled voltage satisfies the first preset voltage condition, it is determined that the corresponding first target battery cell has a thermal runaway anomaly, and first thermal runaway alarm information is generated.

[0101] Step 612 , when the comparison result is that the battery cell temperature of the battery cell meets the second preset temperature condition and the sampled voltage meets the second preset voltage condition, it is determined that the corresponding second target battery cell has thermal runaway, and second thermal runaway alarm information is generated.

[0102] Step 614: Generate control data corresponding to the first thermal runaway warning information or the second thermal runaway warning information, and control the operation of a water pump of the battery thermal management system based on the control data to reduce the battery temperature.

[0103] Step 616: determine the IP address of the first target battery cell or the second target battery cell, and upload the IP address and the first thermal runaway alarm information or the second thermal runaway alarm information corresponding to the IP address to the display terminal for display.

[0104] It should be noted that the specific implementation method of the present application can be achieved through the above-mentioned limited method, which will not be elaborated here.

[0105] In the above embodiment, the NTC resistor film on the surface of each battery cell is connected in parallel, and a voltage sampling point is set at the parallel node, so that the data acquisition module does not need to be additionally configured with multiple voltage sampling channels to realize the monitoring of the voltage change of the NTC resistor film node corresponding to each battery cell in the battery system, and by setting IP for the battery cell in the battery, the connection status of the battery cell is monitored in real time, which can avoid the problem of battery disconnection. Furthermore, based on the IP of the battery cell, the battery parameters of each battery cell can be obtained, and the combination of the battery parameters and the sampling voltage is changed to perform thermal runaway monitoring, so as to solve the problem of only using the temperature of the battery itself. When a single parameter such as temperature is used as the judgment condition for thermal runaway alarm, the problem of false alarm, delayed alarm or no alarm of thermal runaway caused by the distortion of a single parameter such as temperature is improved, and the accuracy of thermal runaway warning is improved. Moreover, based on the sampling voltage of the sampling point of the parallel resistance film loop and the surface temperature of the battery shell, the process of thermal runaway of the battery can be controlled at two levels: low-level early abnormal warning and high-level complete thermal runaway warning, so as to realize the hazard classification of the battery thermal runaway process, early warning, output the faulty battery IP when thermal runaway occurs, achieve the effect of accurately locating the battery with thermal runaway, and send the thermal runaway alarm information to the terminal for display, so that the abnormality can be resolved in time to ensure safety.

[0106] Optionally, in an exemplary embodiment, the data acquisition module of the battery thermal runaway monitoring system is powered by a power supply and has battery parameter acquisition functions such as voltage sampling and temperature sampling, thereby performing real-time detection of the status of each battery and summarizing and uploading data such as battery parameters.

[0107] Further, in an exemplary embodiment, the data acquisition module includes a plurality of sub-acquisition units, each of which is used to acquire battery parameters of a corresponding battery cell, and the sub-acquisition unit includes a temperature detection unit and a voltage detection unit; wherein: the temperature detection unit is used to obtain the battery cell temperature of the corresponding battery cell; the voltage detection unit is used to obtain the sampled voltage of the voltage sampling point. The voltage detection unit can also obtain the battery cell voltage of the battery cell. The voltage detection unit that obtains the sampled voltage of the voltage sampling point can be any one of all the voltage detection units, or can be the voltage detection unit that is physically closest to the voltage sampling point.

[0108] In an exemplary embodiment, in addition to the temperature detection unit and the voltage detection unit, each sub-module in the data acquisition module also includes an IP node unit, which is used to locate the addresses of other sub-acquisition units, determine the IP addresses of the battery cells corresponding to the other sub-acquisition units, and determine the battery parameters corresponding to the IP addresses, so that the battery parameters collected by other sub-acquisition units have corresponding IP addresses. In the case of thermal runaway monitoring, if thermal runaway occurs, the corresponding battery cells can be located according to the mapping relationship between the battery parameters and the IP addresses. Other sub-acquisition units can be understood as sub-acquisition units other than IP node units.

[0109] Optionally, in an exemplary embodiment, as Figure 7 As shown, a structural block diagram of a data acquisition module is provided, and the data acquisition module includes a data summary module, a sub-acquisition unit, and the sub-acquisition unit includes at least an IP node unit, a temperature detection unit, a voltage detection unit, and a current detection unit. The data summary module can summarize the battery parameters collected by each sub-acquisition unit and the IP address corresponding to the battery parameters. The current detection unit is used to detect the current during charging and discharging of the battery block; the voltage detection unit is used to detect the real-time voltage of the battery. The specific limitations of each component in the data acquisition module can be achieved in the manner described above, and will not be repeated here. Based on the data acquisition module, functions such as battery parameters and data summary can be realized.

[0110] In an exemplary embodiment, the processor includes a data verification module and a central processing unit. The data verification module is used to verify the sampled voltage with the preset voltage condition to obtain a voltage comparison result of the sampled voltage; and to verify the battery cell temperature of each battery cell with the preset temperature condition to obtain a temperature comparison result of the battery cell.

[0111] After receiving the comparison results of battery parameter changes sent by the data verification unit, the central processing unit comprehensively determines that the signal change characteristics meet certain conditions, sends a thermal runaway alarm signal, and issues a thermal runaway warning.

[0112] Furthermore, in an exemplary embodiment, Figure 8 As shown, a structural block diagram of a data verification module is provided, and the data verification module includes at least one of a data receiving unit, a content extraction unit, a data comparison unit, and an information sending unit, wherein: The data receiving unit is used to receive the battery parameters collected by the data collecting module and send the battery parameters to the content extracting unit.

[0113] The content extraction unit is used to extract data from the battery parameters to obtain the extracted data, which includes the temperature of each battery cell and the corresponding sampled voltage. It can be understood that the battery parameters received by the data receiving module include multiple parameters, and the content extraction unit can extract the required battery parameters from the battery parameters according to actual needs, that is, extract data, such as the battery cell temperature and sampled voltage. The content extraction unit receives the data collected by a single battery, and the above-mentioned data aggregation module can be to package all the battery block data collected each time to obtain a data set.

[0114] The data comparison unit is used to compare the extracted data with the preset standard value to obtain a comparison result, which includes the size relationship between the extracted battery parameter and the preset standard value.

[0115] In the above embodiment, based on the inconsistent characteristics of the temperature rise of the battery under normal conditions and the temperature rise of the battery under thermal runaway conditions, the degree of change of the total resistance value of the NTC resistor film circuit in the two conditions is also inconsistent. Further judgment is made based on the voltage change difference of the corresponding voltage sampling points in the two conditions and the battery cell temperature to solve the problem of false alarm, delayed alarm or no alarm of thermal runaway caused by the distortion of a single parameter such as the battery's own temperature when only a single parameter is used as the thermal runaway alarm judgment condition, thereby improving the accuracy of thermal runaway warning.

[0116] Based on the corresponding comparison results obtained by the above-mentioned data verification module, the central processing unit can determine that the corresponding battery cell has a thermal runaway abnormality when the comparison result is that the battery cell temperature meets the first preset temperature condition and the sampled voltage meets the first voltage preset condition, and generate a first thermal runaway alarm message; or, when the comparison result is that the battery cell temperature of the battery cell meets the second preset temperature condition and the sampled voltage meets the second voltage preset condition, determine that the corresponding battery cell has a thermal runaway and generate a second thermal runaway alarm message.

[0117] In this method, based on the coupling of the battery shell surface temperature, that is, the surface temperature of each battery cell and the voltage change law mapped by the NTC resistor film circuit wrapped and pasted on the battery surface as the temperature changes, the battery thermal runaway process is controlled at two levels: low-level early abnormal warning and high-level complete thermal runaway warning, so as to achieve hazard classification of the battery thermal runaway process and early warning. Compared with related technologies, it can warn before the battery completely thermally runs away. The response time from the occurrence of thermal runaway to the thermal runaway alarm is relatively long, leaving less time for occupants to escape or take countermeasures, ensuring safety.

[0118] In an exemplary embodiment, the battery thermal runaway monitoring system also includes a central database, which is connected to the processor and is used to store monitoring data of each battery cell or manage the IP of each battery cell, wherein the monitoring data includes at least battery parameters of the battery cell.

[0119] Furthermore, the central database further includes at least one of an IP management module and a data backup unit, and the data backup unit includes at least one of a timestamp module, a data storage module and a disk array module. Fig. 9 As shown, a structural block diagram of a central database is provided, and the central database includes an IP management module, a timestamp module, a data storage module and a disk array module, wherein: The IP management module is used to write the IP address of each battery cell in a preset order, and is also used to delete and rewrite the IP address of the replaced battery.

[0120] The timestamp module is used to divide the time nodes according to the working time of the battery. Among them, the time nodes are divided into the time of charging and discharging. For example, the time nodes are re-divided after each charging or discharging, and the data used for this charging or discharging are collected and stored separately.

[0121] The data storage module is used to back up the collected battery parameters.

[0122] The disk array module is used to perform array processing on each disk storing data according to the time node. The disk array module is used to perform array processing on each disk storing data according to the time node, which can be but not limited to automatically managing the storage, backup, recovery and optimization of data, ensuring the security and availability of data, and improving the overall performance of the storage system.

[0123] The above-mentioned central database can store the monitoring data of each battery cell or manage the IP of each battery cell, set a unique IP for each battery cell and equip it with separate data collection to achieve the function of precise monitoring; it can also accurately push the IP of the thermal runaway battery cell during thermal runaway warning.

[0124] In an exemplary embodiment, a battery thermal runaway monitoring system includes a real-time communication unit, and the real-time communication module can upload monitoring data to a display terminal for display; the monitoring data at least includes thermal runaway alarm information; the thermal runaway alarm signal includes any one of a first thermal runaway alarm information and a second thermal runaway alarm information.

[0125] Furthermore, if Fig.10 As shown, a structural block diagram of a real-time communication module is provided, and the real-time communication module includes a result receiving unit, a thermal management control unit, a terminal display unit, a vehicle network unit and an uploading unit; The result receiving unit is used to receive the monitoring data and thermal runaway warning information processed by the central processing unit, and the terminal display unit is used to display the received monitoring data and thermal runaway warning information on the vehicle display terminal; The thermal management control unit is used to control the water pump operation of the battery thermal management system to reduce the battery temperature after receiving the second thermal runaway warning information; The vehicle network unit is used to provide network signals for wireless control and data transmission of the vehicle. The upload unit is used to send monitoring data to the host computer or cloud platform based on the vehicle network unit. The above real-time communication unit ensures the transmission of data such as monitoring data and thermal runaway alarm information.

[0126] In an exemplary embodiment, the battery thermal runaway monitoring system may further include a connection status monitoring module, which is used to detect the connection status of each battery cell and issue a real-time warning in the event of abnormal connection.

[0127] Furthermore, in an exemplary embodiment, Fig.11 As shown, a structural block diagram of an access status monitoring module is provided, and the access status monitoring module includes a CAN line channel detection unit, a connection status monitoring unit, an IP address acquisition unit and an abnormal alarm unit, wherein: The CAN line channel detection unit is used to detect the communication connection status of the sub-acquisition module of each battery cell and send the detection result to the central processing unit; the detection result may include normal data communication transmission and abnormal data communication transmission.

[0128] The connection status detection unit is used to detect the connection status of each battery cell to determine whether there is data loss in each battery cell or whether the battery is offline.

[0129] The IP address acquisition unit is used to acquire the address of the IP node unit under test and locate the corresponding battery cell according to the address of the IP node unit; the IP node unit under test is any one or more of the IP node units; for example, in the case of an abnormal battery cell, the address of the IP node unit under test can be acquired according to the IP address acquisition unit, and the corresponding battery cell can be located according to the address of the IP node unit.

[0130] The abnormal alarm unit is used to send out an alarm signal when the connection status of the battery cell is abnormal. The connection abnormality here can be an abnormality in the series or parallel path between the battery blocks (i.e., the battery cell), or a battery disconnection.

[0131] The above-mentioned real-time communication module can monitor the connection status of the battery cells and issue an alarm in abnormal situations.

[0132] In an exemplary embodiment, Fig.12 As shown, a battery thermal runaway monitoring system is provided, which includes a central database, an access status monitoring module, a data acquisition module, a data verification module, a central processing unit, a real-time communication module, a battery pack, an NTC resistor film, a 12V power supply, a fixed resistor, a voltage sensor, and a temperature sensor. The central database is connected to the access status monitoring module and the central processing unit in communication, the access status monitoring module is connected to the data acquisition module in communication, the data acquisition module is connected to the data verification module in communication, the data verification module is connected to the central processing unit and the IP management module in communication, and the central processing unit is connected to the real-time communication module in communication.

[0133] Among them, the battery is composed of multiple battery cells connected in series or in parallel; NTC resistor film (same specifications and same resistance value) is wrapped and attached to the surface of each battery cell, and each NTC resistor film is connected in parallel. It is a positive temperature coefficient thermistor film. When the temperature exceeds a certain temperature, its resistance value increases with the increase of temperature; the total resistance value of the NTC resistor film loop after parallel connection is R2, one end of the loop is connected to the positive pole loop of the 12V power supply, and the other end is connected to the fixed resistor R1; the 12V power supply is used to power each module in this system and is connected through a wiring harness; it is also used to apply a certain voltage to both ends of the fixed resistor and the NTC resistor film; one end of the fixed resistor is connected to the NTC resistor film, and the other end is connected to the negative pole loop of the 12V power supply, which is used to solidify a voltage detection point V', so as to judge the reliability and authenticity of the battery temperature change according to the V' voltage.

[0134] A voltage sensor is arranged between the fixed resistor and the NTC resistor film, which is used by the data acquisition module to detect the voltage V' of the node of the NTC resistor film parallel circuit in real time; one type is arranged on the aluminum bar welded on the battery cell pole, which is used by the data acquisition module to detect the voltage of each battery cell in real time; the other end is connected to the data acquisition module. A temperature sensor is arranged on the upper surface of each battery cell, which is used by the data acquisition module to detect the temperature of each battery cell in real time; the other end is connected to the data acquisition module; the arrangement of the temperature sensor is different from that of the NTC resistor film, and the NTC resistor film is arranged on the side of each battery cell.

[0135] It should be noted that the specific functions or implementations of each part of the system can be implemented in the manner specified in the embodiments of the above system, which will not be elaborated here.

[0136] Exemplarily, the IP of the vehicle battery is written in sequence through the IP management module. If the battery is replaced, the IP of the replaced battery is deleted and the IP is rewritten to the newly replaced battery; the series-parallel paths between multiple battery blocks are detected through the CAN line channel detection module, and the detection results are sent to the central processing unit; the connection status of each independent battery block is detected through the connection status detection module to determine whether the battery cell is offline; the address of the tested IP node unit is obtained through the IP address acquisition module; and the corresponding battery is located according to the address of the IP node unit. If the sub-acquisition unit in the battery data acquisition module is abnormally connected, the abnormal alarm module sends a connection abnormality alarm signal and a connection abnormality node IP address. Whether the sub-acquisition unit connection is abnormal can indicate whether the data acquisition status of each battery cell is normal.

[0137] If the battery cell is connected normally, the operating temperature of the corresponding battery block is detected by the temperature detection module to obtain the battery cell temperature of the battery cell, the current of the battery block during charging and discharging is detected by the current detection unit, the real-time voltage of the battery is detected by the voltage detection unit, and the corresponding data is sent to the summary module through the sub-collection unit. The data receiving module obtains the collected data summarized by the data summary module, and sends the obtained data to the content extraction unit. The content extraction unit extracts the content of the received data and converts it into collected data. The data comparison module compares the extracted data with the set standard value, and determines the battery status to obtain the comparison result. Then the information sending unit sends the comparison result to the central processing unit. The central processing unit performs thermal runaway analysis based on the comparison result to determine the thermal runaway data of each battery cell.

[0138] At the same time, the data storage module backs up the collected battery data, the timestamp module divides the time nodes according to the working time of the battery, and the disk array module performs array processing on each disk storing data according to the time nodes to facilitate subsequent retrieval. The monitoring data and early warning signals processed by the central processing unit are received through the result receiving module, and the received data is displayed on the on-board display terminal under the action of the terminal display module. The on-board network module is used to provide network signals for wireless control and data transmission of the vehicle. If the monitoring data needs to be sent to the host computer or cloud platform, it is sent through the upload module. If it does not need to be sent, the network communication between the on-board network module and the host computer or cloud platform is disconnected.

[0139] The above-mentioned battery thermal runaway monitoring system connects the NTC resistor film on the surface of each battery cell in parallel, and sets a voltage sampling point at the parallel node, so that the data acquisition module does not need to configure multiple voltage sampling channels to realize the voltage change of the NTC resistor film node corresponding to each battery cell in the battery system, and by setting IP for the battery cell in the battery, the connection status of the battery cell is monitored in real time, which can avoid the problem of battery disconnection. Furthermore, based on the IP of the battery cell, the battery parameters of each battery cell can be obtained, and the combination of the battery parameters and the sampling voltage is changed to perform thermal runaway monitoring, and the solution is provided. It solves the problem of false alarm, late alarm or no alarm of thermal runaway caused by distortion of a single parameter when only a single parameter such as the battery's own temperature is used as the judgment condition of thermal runaway alarm, and improves the accuracy of thermal runaway warning. Moreover, based on the sampling voltage and the surface temperature of the battery shell, the process of thermal runaway of the battery can be controlled at two levels: low-level early abnormal warning and high-level complete thermal runaway warning, so as to realize the hazard classification of the battery thermal runaway process, give early warning, output the faulty battery IP when thermal runaway occurs, achieve the effect of accurately locating the battery with thermal runaway, and send the thermal runaway alarm information to the terminal for display, so that the abnormality can be resolved in time to ensure safety.

[0140] Each module in the above battery thermal runaway monitoring system can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of the processor in the vehicle in the form of hardware, or can be stored in the memory in the vehicle in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0141] It should be noted that, based on the same inventive concept, the battery thermal runaway monitoring method provided in the present application can be applied to any battery thermal runaway monitoring system recorded in the present application. The embodiment of the present application provides a battery thermal runaway monitoring method for implementing the battery thermal runaway monitoring system involved above. The implementation solution to the problem provided by the method is similar to the implementation solution recorded in the above method. The specific limitations of one or more battery thermal runaway monitoring systems provided in the present application can be found in the above limitations on the battery thermal runaway monitoring method, which will not be repeated here.

[0142] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0143] In an exemplary embodiment, a vehicle is provided. The vehicle may be a server, and its internal structure diagram may be as shown in FIG. Fig.13 As shown. The vehicle includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the vehicle is used to provide computing and control capabilities. The memory of the vehicle includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the vehicle is used to store battery data. The input / output interface of the vehicle is used to exchange information between the processor and an external device. The communication interface of the vehicle is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery thermal runaway monitoring method is implemented.

[0144] Those skilled in the art will understand that Fig.13 The structure shown in the figure is merely a block diagram of a portion of the structure related to the scheme of the present application, and does not constitute a limitation on the vehicle to which the scheme of the present application is applied. A specific vehicle may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0145] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0146] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0147] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0148] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0149] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0150] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0151] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A battery thermal runaway monitoring system, characterized in that: The system includes a power supply, a data acquisition module and a processor. The battery includes a plurality of battery cells. A thermistor is provided on the surface of each battery cell. All the thermistors are connected in parallel to form a thermistor loop. One end of the thermistor loop is connected to the positive electrode of the power supply. The other end of the thermistor loop is connected to a voltage divider resistor, which is connected to the negative electrode of the power supply through the voltage divider resistor. The parallel node formed by the thermistors in parallel is determined as the voltage sampling point of the thermistor loop. The data acquisition module is used to acquire battery parameters of the battery, wherein the battery parameters at least include the battery cell temperature of each of the battery cells and the sampled voltage of the voltage sampling point; The processor is used to verify the battery parameters, obtain comparison results of the battery parameters, perform thermal runaway analysis according to the comparison results, and determine thermal runaway data of each of the battery cells.

2. The system according to claim 1, characterized in that The data acquisition module includes a plurality of sub-acquisition units, each of which is used to collect battery parameters of a corresponding battery cell, and the sub-acquisition unit includes a temperature detection unit and a voltage detection unit; wherein: The temperature detection unit is used to obtain the battery cell temperature of the corresponding battery cell; The voltage detection unit is used to obtain the sampled voltage of the voltage sampling point.

3. The system according to claim 2, characterized in that Each of the sub-collection units further includes an IP node unit, and the IP node unit is used to locate the addresses of other sub-collection units, determine the IP addresses of the battery cells corresponding to the other sub-collection units, and determine the battery parameters corresponding to the IP addresses.

4. The system according to claim 3, characterized in that The system further includes a central database connected to the processor, and the central database is used to store monitoring data of each battery cell or manage the IP of each battery cell, wherein the monitoring data at least includes battery parameters of the battery cell.

5. A battery thermal runaway monitoring method, characterized in that: The method is applied to the system according to any one of claims 1 to 4, and the method comprises: Acquiring battery parameters of the battery; the battery parameters at least include a battery cell temperature of each of the battery cells and a sampled voltage of the voltage sampling point; Verifying the battery parameters to obtain comparison results of the battery parameters; A thermal runaway analysis is performed according to the comparison result to determine the thermal runaway data of each battery cell.

6. The method according to claim 5, characterized in that The verifying the battery parameters to obtain the comparison result of the battery parameters includes: Verifying the sampled voltage with a preset voltage condition to obtain a voltage comparison result of the sampled voltage; Verifying the battery cell temperature of each of the battery cells with a preset temperature condition to obtain a temperature comparison result of the battery cell; Accordingly, performing thermal runaway analysis according to the comparison result to determine thermal runaway data of each battery cell includes: A thermal runaway analysis is performed according to the voltage comparison result and the temperature comparison result to determine thermal runaway data of each of the battery cells.

7. The method according to claim 6, characterized in that The preset voltage condition includes a first preset voltage condition and a second preset voltage condition, and the verifying the sampled voltage with the preset voltage condition to obtain a voltage comparison result of the sampled voltage includes: Verifying the sampled voltage with a first preset voltage condition to obtain a first voltage comparison result of the sampled voltage; and / or The sampled voltage is verified with a second preset voltage condition to obtain a second voltage comparison result of the sampled voltage.

8. The method according to claim 7, characterized in that The preset temperature condition includes a first preset temperature condition and a second preset temperature condition, and the battery cell temperature of each of the battery cells is verified with the preset temperature condition to obtain a temperature comparison result of the battery cell, including: Verifying the battery cell temperature of each of the battery cells with a first preset temperature condition to obtain a first temperature comparison result of the battery cell; and / or The battery cell temperature of each of the battery cells is verified with a second preset temperature condition to obtain a second temperature comparison result of the battery cell.

9. The method according to claim 8, characterized in that The performing thermal runaway analysis according to the voltage comparison result and the temperature comparison result to determine the thermal runaway data of each battery cell includes: When the comparison result is that the battery cell temperature of the battery cell satisfies the first preset temperature condition, and the sampled voltage satisfies the first preset voltage condition, determining that the corresponding first target battery cell has a thermal runaway abnormality, and generating first thermal runaway alarm information; and / or When the comparison result is that the battery cell temperature of the battery cell satisfies the second preset temperature condition and the sampled voltage satisfies the second preset voltage condition, it is determined that the corresponding second target battery cell has thermal runaway, and second thermal runaway alarm information is generated.

10. The method according to claim 9, characterized in that The method further comprises: Determining an IP address of the first target battery cell or the second target battery cell; The IP address and the first thermal runaway alarm information or the second thermal runaway alarm information corresponding to the IP address are uploaded to a display terminal for display.

11. The method according to claim 9, characterized in that The method further comprises: Generate control data corresponding to the first thermal runaway warning information or the second thermal runaway warning information, and control the operation of a water pump of a battery thermal management system based on the control data to reduce the battery temperature.

12. The method according to claim 5, characterized in that The method further comprises: Determine a relative order between the battery cells in the battery, and write an IP address to each battery cell based on the relative order; When it is detected that a replacement battery cell exists in the battery, the IP address of the replacement battery cell is updated.

13. The method according to claim 5, characterized in that The method further comprises: The connection status of each battery cell is detected, and a real-time warning is issued in case of abnormal connection; wherein the connection status of each battery cell includes whether each battery cell is offline.

14. A vehicle comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 13 are implemented.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 13 are implemented.

16. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 5 to 13 are implemented.

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