Battery, thermal runaway early warning method and device thereof and storage medium

Abstract

The invention relates to the field of batteries, and provides a battery, a thermal runaway early warning method and device thereof and a storage medium. The battery is provided with an accommodating space, the accommodating space is used for discharging smoke under the condition of thermal runaway of a battery cell of the battery, and the method comprises the following steps: acquiring a detection signal of a detection position including the accommodating space; and generating a thermal runaway early warning signal according to the detection signal. By arranging the sensor for acquiring the detection signal in the accommodating space, when the battery discharges smoke through the accommodating space, the temperature or the air pressure at the interlayer can be increased, so that the sensor arranged in the accommodating space can accurately and effectively detect a change signal of the temperature or the air pressure of the battery; therefore, a thermal runaway early warning signal can be generated in time, longer processing time is reserved for a user, and the loss caused by thermal runaway of the battery is reduced.

Description

Battery and thermal runaway warning method, device and storage medium thereof Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method, device, and storage medium for warning of thermal runaway of batteries. Background Art

[0002] Energy and environmental issues are major challenges facing humanity. Establishing a clean, renewable energy system has become an inevitable choice for human society. Advances in energy storage technology have increased battery energy density, but this also introduces potential chemical instability. Battery thermal runaway can lead to serious safety incidents, such as vehicle accidents and fires in energy storage substations. Ensuring battery safety and providing early detection of thermal runaway events have become key concerns and challenges.

[0003] To ensure timely detection of battery thermal runaway events and allow personnel time to safely escape, a battery pack pressure monitoring sensor can be installed inside the battery pack. This sensor detects changes in internal pressure, providing early warning of battery thermal runaway. However, when the battery cell's explosion-proof valve faces downward, the sensor inside the battery pack cannot detect thermal runaway in a timely manner, hindering the ability to minimize losses after a thermal runaway event.

[0004] Summary of the Invention

[0005] In view of this, the embodiments of the present application provide a battery and its thermal runaway warning method, device, equipment and storage medium to solve the problem in the prior art that the battery pack pressure monitoring sensor in the battery pack cannot timely sense the battery thermal runaway, which is not conducive to reducing the losses after the battery thermal runaway.

[0006] A first aspect of an embodiment of the present application provides a thermal runaway warning method for a battery, wherein the battery is provided with a storage space, and the storage space is used to release flue gas in the event of thermal runaway of a battery cell of the battery. The method comprises: obtaining a detection signal at a detection position including the storage space; generating a thermal runaway warning signal according to the detection signal, thereby enabling a more reliable generation of a thermal runaway warning signal based on the detection signal at the storage space for releasing flue gas, reducing the probability of missed warnings, and reducing losses after thermal runaway.

[0007] By installing a sensor in the storage space to acquire detection signals, when the battery releases smoke through the storage space, the temperature or pressure at the interlayer increases. Therefore, the sensor installed in the storage space can promptly and effectively detect the change in battery temperature or pressure. When the detected temperature or pressure signals meet the preset warning conditions, a thermal runaway warning signal can be generated based on the detection signal. For example, a voice alarm signal, a warning light prompt signal, a text warning signal, an image warning signal, etc. can be generated. This allows battery users, such as car drivers and passengers, to have more time to deal with the situation, such as getting out of the car and leaving the accident scene, which can effectively reduce the losses caused by battery thermal runaway.

[0008] In combination with the first aspect, in a first possible implementation of the first aspect, the accommodating space includes one or more of the compartment space of the battery and the internal space of the hollow beam structure of the battery.

[0009] The accommodating space is a space for accommodating the fumes released from the battery. The space may include an interlayer space formed by an interlayer structure. The interlayer space may be the interlayer space of a battery module or the interlayer space of a battery pack. In a possible implementation, the accommodating space may also include the internal space of a hollow beam structure in the battery. The hollow beam structure may be provided in the battery module or the battery pack. For example, the interlayer serving as the accommodating space may be provided at the end of the battery module or battery pack, including at the bottom, top, or side of the battery module or battery pack. Alternatively, the interlayer may be provided in the middle layer of the battery module or battery pack. When the accommodating space is a hollow beam structure, the hollow beam structure may be provided at the end of the battery module or battery pack, including at the bottom, top, or side, or may be provided in a space within the battery module or battery pack at a predetermined distance from the end. The accommodating space may be provided with a spray valve, through which the fumes from the battery cell can enter the accommodating space. When the smoke concentration in the accommodating space reaches a certain depth, the explosion-proof valve in the accommodating space is opened and the smoke is discharged through the explosion-proof valve.

[0010] In combination with the first possible implementation of the first aspect, in the second possible implementation of the first aspect, when the accommodating space includes the partition space of the battery, the detection position includes any position within the partition space and / or the inner surface of the partition space.

[0011] In order to better detect the abnormal state of the battery through the interlayer space, the sensor for obtaining the detection signal can be set at any position in the interlayer space, or on the inner surface of the interlayer space. Specifically, when the smoke signal of the battery cell enters the interlayer space through the spray valve, the sensor located in the interlayer space can obtain the detection signal, including temperature signals or air pressure signals. In a possible implementation, when the interlayer space is located at the end or side of the battery module or battery pack, the detection position can also be located on the surface of the inner layer of the interlayer space, which may include the inner surface and outer surface of the inner layer. By obtaining the detection signal on the inner surface of the interlayer space, including temperature signals or air pressure signals, etc., the abnormal state of the battery can be detected in time.

[0012] In combination with the first aspect to any one of the second possible implementation methods of the first aspect, in the third possible implementation method of the first aspect, the detection signal includes a first signal and a second signal; obtaining the detection signal at the detection position including the accommodating space includes: obtaining the first signal at the detection position including the accommodating space; when the first signal meets the preset wake-up condition, waking up the battery management system, and obtaining the second signal by the battery management system; wherein the sampling frequency of the second signal is greater than the sampling frequency of the first signal.

[0013] In order to reduce system power consumption, the detection signal can be set to include a first signal and a second signal, and the detection positions of the first signal and the second signal can include the accommodation space. The first signal is obtained when the system is in a sleep state. The first signal is compared with the preset wake-up condition. When it is determined that the first signal meets the wake-up condition, the battery management system is awakened to enter a normal working mode, and the second signal at the detection position including the accommodation space is collected. Based on the normal working mode, the second signal is sampled at a higher sampling frequency than the sampling frequency of the first signal. The second signal can be used to perform early warning analysis of thermal runaway to obtain a more reliable early warning result. And when the first signal does not meet the wake-up condition, the battery management system is in a low-power sleep state, which is beneficial to reduce system power consumption and improve the battery life of the battery management system.

[0014] In combination with the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the first signal includes one or more of a temperature signal and an air pressure signal whose detection position is located in the accommodating space.

[0015] When the battery cell is in thermal runaway, the released smoke will enter the storage space. Therefore, when the battery is in thermal runaway, the smoke entering the storage space will increase the air pressure and temperature in the storage space. A temperature sensor and / or air pressure sensor can be set in the storage space, including in the interlayer space or in the hollow beam structure, to detect the air pressure signal and / or temperature signal in the storage space. In a possible implementation, when the battery cell generates smoke, the inner surface of the interlayer space set at the end or side will be affected by the smoke and increase the temperature. The detection signal can be obtained through the inner surface of the interlayer space, so that the abnormal state of the battery can be detected quickly and effectively.

[0016] In combination with the third possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the first signal further includes one or more of the battery voltage, the temperature of the battery balancing circuit board, and the battery cell temperature.

[0017] The battery voltage may include a battery module voltage or a battery pack voltage. A battery pack may include multiple battery modules connected in series, and a battery module may include multiple battery cells connected in series. The output voltage of a battery module is the sum of the voltages of the battery cells connected in series, and the output voltage of a battery pack is the sum of the voltages of the battery modules connected in series. When the voltage of one or more battery cells decreases, the output voltage of the battery module will decrease, and the voltage of the battery pack connected in series through the battery modules will also decrease. Therefore, by detecting the output voltage of a battery module or battery pack, abnormal battery conditions can be detected in a timely manner. In addition, when a battery is in a thermal runaway state, the temperature of the battery's balancing circuit board and the battery cell temperature may also be abnormal. By combining the detection of the battery cell temperature and the balancing circuit board temperature, the detection accuracy can be effectively improved.

[0018] In combination with the third possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the second signal includes two or more of a temperature signal at the accommodating space, an air pressure signal at the accommodating space, a temperature change rate at the accommodating space, an air pressure change rate at the accommodating space, a battery cell voltage of the battery, a battery cell temperature of the battery, a temperature change rate of the battery cell, a temperature of a balancing circuit board of the battery, and a temperature change rate of the balancing circuit board of the battery.

[0019] When a battery is in thermal runaway and releases a smoke signal, the temperature of the storage space, the air pressure in the storage space, the temperature of the equalizing voltage circuit, and the temperature of the battery cells will change. By detecting the temperature of the storage space, the air pressure in the storage space, the temperature of the equalizing voltage circuit, and the temperature of the battery cells, it can be determined whether the currently acquired second signal indicates that the battery is in thermal runaway. Furthermore, the rate of change of the abnormal battery state can be determined by using other state indicators, such as the rate of change of the temperature in the storage space, the rate of change of the air pressure in the storage space, the rate of change of the temperature of the battery cells, and the rate of change of the temperature of the battery equalizing circuit board. This facilitates timely and effective detection of voltage thermal runaway when the abnormal state changes rapidly.

[0020] In combination with the sixth possible implementation method of the first aspect, in the seventh possible implementation method of the first aspect, a thermal runaway warning signal is generated based on the detection signal, including: when two or more signals in the second signal meet the preset warning requirements, a thermal runaway warning signal is generated.

[0021] In order to improve the accuracy of battery thermal runaway state detection, it is possible to set a thermal runaway warning signal to be generated when at least two of the second signals are abnormal. By setting two or more indicators for joint detection and judgment, the probability of false alarms due to inaccurate individual signals can be reduced. For example, when the temperature signal detected by the temperature sensor may contain noise signals, the detected battery cell temperature will meet the judgment conditions for thermal runaway. By jointly judging with other indicators, when other indicators are normal, the warning can be temporarily deferred, thereby effectively reducing the probability of false detection and improving the accuracy of battery thermal runaway state detection.

[0022] In combination with the third possible implementation method of the first aspect to the seventh possible implementation method of the first aspect, in the eighth possible implementation method of the first aspect, obtaining the detection position includes the detection signal at the accommodating space, including: monitoring the first signal through a listener with a host wake-up function; when the first signal meets the preset wake-up condition, waking up the battery management system from sleep mode to normal working mode through the listener, and the battery management system obtains the second signal in the normal working mode.

[0023] Among them, the listener can include two working modes, namely sleep mode and normal working mode. In sleep mode, the listener can collect two different status signals in sleep mode, namely heartbeat signal and fault tone signal. Among them, the heartbeat signal is the signal when the battery is in normal working state, and the fault tone is the signal when the battery is in abnormal state. When the listener detects the fault tone signal, it can trigger the pin level to change, such as triggering the pin to a high level state. Through the change of the pin level, the battery management system can be triggered to enter the normal working mode from the low-power sleep mode, and collect the second signal in the normal working mode. When the battery is in normal state, the listener and the battery management system can be in sleep mode.

[0024] In combination with the third possible implementation manner of the first aspect to the seventh possible implementation manner of the first aspect, in the ninth possible implementation manner of the first aspect, obtaining the detection position including the detection signal at the accommodating space includes: sampling the first signal in a low power consumption mode through a sampling controller; when the first signal meets a preset wake-up condition, waking up the battery management system to enter a normal working mode through the sampling controller, and the sampling controller switches from the low power consumption mode to the normal working mode, and the battery management system controls the sampling controller to obtain the second signal in the normal working mode.

[0025] When the sampling device does not support reverse wakeup of the battery management system, a sampling controller can obtain a sampled first signal in low-power mode. If the first signal meets the preset wakeup conditions, the sampling controller wakes up the battery management system and enters normal operating mode. The sampling controller switches from low-power mode to normal operating mode, and the battery management system controls the sampling controller to perform signal acquisition in normal operating mode to obtain a second signal. The sampling frequency of the second signal acquired in normal operating mode is higher than the sampling frequency of the first signal acquired in sleep mode, resulting in a more accurate and timely sampling signal, thereby improving the accuracy and timeliness of data detection and judgment.

[0026] In combination with the third possible implementation method of the first aspect to the seventh possible implementation method of the first aspect, in the tenth possible implementation method of the first aspect, obtaining the detection position includes the detection signal at the accommodating space, including: comparing the first signal with a preset threshold signal; when the comparison result meets the preset wake-up condition, triggering the battery management system to enter the normal working mode from the sleep mode, and the battery management system controls the sampler to obtain the second signal in the normal working mode.

[0027] To reduce system costs, a comparator can be used to trigger the battery management system to switch from sleep mode to working mode. The comparator's input can receive a reference signal and a detection signal, and based on the comparison result between the detection signal and the reference signal, the comparator outputs different signals. The battery management system controls the switching of the battery management system's state based on the different signals output by the comparator. For example, when the detection signal indicates that the battery is in a normal state, the control signal output by the comparator can put the battery management system into sleep mode. When the detection signal indicates that the battery is in an abnormal state, the control signal output by the comparator can put the battery management system into normal working mode, thereby enabling the acquisition of the second signal at a higher sampling frequency.

[0028] In combination with the third possible implementation manner of the first aspect to the seventh possible implementation manner of the first aspect, in the eleventh possible implementation manner of the first aspect, when the battery cells are in a parallel structure, the first signal includes an air pressure signal and / or a temperature signal, and the collection location of the air pressure signal and / or the temperature signal includes the accommodating space.

[0029] When the battery cells in a battery module are connected in parallel, or when the battery modules in a battery pack are connected in parallel, an abnormality in one of the associated cells has very little impact on the detection voltage, making it difficult to determine whether the battery is in a thermal runaway state based on the detected voltage. In this case, to improve the accuracy of detection, the detection location of the first signal may include a detection signal at the accommodating space, including an air pressure signal and / or temperature signal at the accommodating space. The air pressure signal and / or temperature signal collected at the accommodating space improves the accuracy of the detection result of the battery thermal runaway state.

[0030] A second aspect of an embodiment of the present application provides a thermal runaway warning device for a battery, wherein the battery is provided with a storage space, and the storage space is used to release smoke in the event of thermal runaway of a battery cell of the battery. The method includes: a detection signal acquisition unit, used to acquire a detection signal at a detection position including the storage space; and a warning unit, used to generate a thermal runaway warning signal based on the detection signal.

[0031] A third aspect of an embodiment of the present application provides a battery, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in any one of the first aspects are implemented.

[0032] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in any one of the first aspects are implemented.

[0033] It can be understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] FIG1 is a top view of a temperature sensor arranged at an interlayer according to an embodiment of the present application;

[0036] FIG2 is a side view schematic diagram of a temperature sensor arranged at a partition provided by an embodiment of the present application;

[0037] FIG3 is a side view schematic diagram of another arrangement of a temperature sensor at a partition provided by an embodiment of the present application;

[0038] FIG4 is a schematic diagram of a circuit structure of a thermal runaway warning system for a battery provided in an embodiment of the present application;

[0039] FIG5 is a schematic diagram of an implementation flow of a battery thermal runaway warning method provided in an embodiment of the present application;

[0040] FIG6 is a schematic diagram of a circuit structure of another battery thermal runaway warning system provided in an embodiment of the present application;

[0041] FIG7 is a schematic diagram of an implementation flow of another battery thermal runaway warning method provided in an embodiment of the present application;

[0042] FIG8 is a schematic diagram of a circuit structure of another battery thermal runaway warning system provided in an embodiment of the present application;

[0043] FIG9 is a schematic diagram of an implementation flow of another battery thermal runaway warning method provided in an embodiment of the present application;

[0044] FIG10 is a schematic diagram of a circuit structure of another battery thermal runaway warning system provided in an embodiment of the present application;

[0045] FIG11 is a schematic diagram of a flow chart of another battery thermal runaway warning method according to an embodiment of the present application;

[0046] FIG12 is a schematic diagram of a thermal runaway warning device for a battery provided in an embodiment of the present application;

[0047] FIG13 is a schematic structural diagram of a battery provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0048] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0049] In order to illustrate the technical solution described in this application, specific embodiments are provided below.

[0050] In order to ensure the safety of battery use and improve the detection of battery thermal runaway, it is necessary to monitor the battery for thermal runaway. For example, a battery pack pressure monitoring sensor is set in the battery pack to detect the change of air pressure in the battery pack. With the development of technology, in order to increase the energy density in a limited space, the battery cell explosion-proof valve is usually set downward so that when the battery cell has thermal runaway, the smoke can be ejected from the bottom valve. In this case, the battery module or battery pack pressure sensor set in the battery pack may not be able to detect the abnormality through the battery module or battery pack pressure monitoring sensor or smoke sensor, which is not conducive to timely detection of the battery's thermal runaway state and is not conducive to reducing the loss after the battery thermal runaway.

[0051] In order to solve the above problems, an embodiment of the present application proposes a battery thermal runaway warning method, through which the battery thermal runaway warning can be timely and effectively performed, thereby reducing the losses caused by battery thermal runaway.

[0052] In embodiments of the present application, the first sensor used to detect thermal runaway warnings may include one or more of a temperature sensor, an air pressure sensor, or a voltage sensor. The accommodation space in embodiments of the present application may include a compartment space at the end or side of a battery module or battery pack, or may also include the interior space of a hollow beam structure within a battery module or battery pack. Figure 1 shows a top-down schematic diagram of a temperature sensor arrangement in a compartment space, according to an embodiment of the present application. As shown in Figure 1, multiple temperature sensors, R1, R2, R3, and R4, are located in the compartment space at the bottom of battery 1. The temperature sensors transmit collected temperature signals to a battery management system. This battery management system is not limited to a traditional battery management system and may also include a vehicle controller or motor controller with integrated battery management system functionality. Figure 1 illustrates only four locations for temperature sensors. Depending on the required detection accuracy, a larger or smaller number of temperature sensors may be provided. The temperature sensor may be a thermistor. By detecting the resistance of the thermistor, the temperature at the thermistor can be determined through a table lookup. The acquired temperature can be used to wake up the battery management system or, after waking up the battery management system, determine whether to generate a warning signal.

[0053] FIG2 is a side view schematic diagram of an arrangement of temperature sensors in an interlayer space provided by an embodiment of the present application. As shown in FIG2 , the temperature sensor is arranged on the upper surface of the upper cover 21 of the interlayer space 2 at the bottom of the battery 1 (when the interlayer space is at the top, the temperature sensor can be arranged on the lower surface of the lower cover of the top interlayer space), and the temperature sensors R1, R2, R3 and R4 transmit the collected temperature signals to the battery management system BMS. When the battery cell is in thermal runaway, smoke is sprayed into the interlayer space through the spray valve at the bottom of the cell, causing the upper cover of the interlayer space to be heated, and the temperature change is detected by the temperature sensor arranged at the upper cover of the interlayer space, thereby waking up the battery management system according to the detected temperature, or generating an early warning signal based on the detected temperature.

[0054] FIG3 is a side view schematic diagram of another arrangement of temperature sensors in the interlayer space 2 provided in an embodiment of the present application. As shown in FIG3 , the temperature sensor is arranged in the interlayer space 2 at the bottom of the battery 1, and the temperature sensors R1, R2, R3 and R4 transmit the collected temperature signals to the battery management system BMS. When the battery cell thermally runs away, smoke is sprayed into the interlayer space through the spray valve at the bottom of the cell. The temperature sensor arranged in the interlayer space can detect the temperature change in the interlayer space in a timely and effective manner. Based on the detected temperature, the battery management system is awakened, or a warning signal is generated based on the detected temperature.

[0055] To improve the detection accuracy of the temperature sensor, when the temperature sensor is installed in the interlayer space, it can be placed near the explosion-proof valve in the interlayer space. This temperature sensor, located near the explosion-proof valve, can more quickly and effectively detect temperature changes within the interlayer space. For example, when the explosion-proof valve is open, the temperature sensor located in the interlayer space can more effectively detect the valve's status than temperature sensors placed elsewhere.

[0056] It is understood that the temperature sensor is not limited to being set solely in the interlayer space or solely on the surface of the upper cover of the interlayer space. The temperature sensor can be set both in the interlayer space and on the upper cover of the interlayer space (e.g., on the upper surface of the interlayer space). The thermal runaway warning signal is generated by detecting signals at detection locations including the interlayer space, thereby improving the accuracy and timeliness of the thermal runaway warning signal.

[0057] In possible implementations, the first signal used for thermal runaway warning may also include signals such as the battery cell voltage, balanced circuit board temperature, and module temperature to assist in determining whether the battery is in a thermal runaway state. For example, if the battery voltage is detected to be less than a predetermined voltage threshold, indicating an undervoltage condition, the battery management system may be awakened to enter continuous operation and, based on the collected signals, determine whether to generate a thermal runaway warning. The specific awakening methods are described below, according to different embodiments.

[0058] Example 1:

[0059] Figure 4 is a schematic diagram of the circuit structure of a battery thermal runaway warning system provided in an embodiment of the present application. As shown in Figure 4, the circuit structure includes a sensor module 11, a sampler 12 with a reverse wake-up function, a monitor 13, and a battery management system 14. The sensor module includes, but is not limited to, a balanced circuit board temperature sensor 111, a barrier temperature sensor 112, a module temperature sensor 113, and a battery cell voltage detection component 114. Without limitation, the sensors used may include a single sensor, two sensors, or more than two sensors.

[0060] The balancing circuit board temperature sensor 111 is used to collect the balancing circuit board temperature Tb, and the interlayer temperature sensor 112 is used to detect the interlayer space temperature Tg. The module temperature sensor 113 is used to collect the battery module temperature Tc. In a possible implementation, when the detected object is a battery pack, a battery pack temperature sensor may also be included. The battery cell voltage detection component 114 is used to detect the module cell voltage Vc. The sampler 12 can receive the sensor signals collected by the balancing circuit board temperature sensor 111, the interlayer temperature sensor 112, the module temperature sensor 113, and the battery cell voltage detection component 114 in sleep mode and determine whether the collected sensor signals are abnormal. For example, the sampler 12 can compare the collected balancing circuit board temperature Tb, the interlayer space temperature Tg, the battery module temperature Tc, and the battery module cell voltage Vc with the corresponding balancing circuit board temperature threshold Ttb, the interlayer space temperature threshold Ttb, the module temperature threshold Ttc, and the battery cell voltage Vtc, respectively. According to the comparison result, it is determined whether a wake-up flag needs to be generated to wake up the listener 13 .

[0061] Among them, the listener 13 is used to convert the wake-up identifier into a wake-up signal so that the converted wake-up signal can be recognized by the battery management system (BMS) 14. For example, the wake-up identifier can be converted into a wake-up signal based on the SPI (Serial Peripheral Interface) communication protocol, or a wake-up signal based on the UART (Universal Asynchronous Receiver / Transmitter) communication protocol. The listener 13 is used to provide a communication interface for communicating with the sampler 12. When the sampler 12 detects an abnormal signal that the battery may be in a thermal runaway state, the listener 13 is awakened through the communication interface.

[0062] Multiple samplers 12 can be configured to monitor the collected sensor signals. A wake-up flag determined by an abnormal sensor signal can be transmitted to the listener 13 via a daisy-chain circuit structure and a communication interface provided by the listener 13. After being converted and processed by the listener 13, a wake-up signal is generated and sent to the battery management system 14 to wake up the battery management system 14 and enter a continuous operation mode. The battery management system can include any controller that integrates battery management system functions, such as a vehicle controller or a motor controller.

[0063] In continuous operation mode, the battery management system increases the sampling frequency and determines whether to generate a warning signal based on the sampled signal, thereby reducing losses based on the warning signal. For example, if a vehicle battery warning signal is generated, it can notify passengers to leave the vehicle based on the warning signal.

[0064] FIG5 is a schematic diagram of an implementation process of a battery thermal runaway warning method provided in an embodiment of the present application. As shown in FIG5 , the process includes:

[0065] In S501 , sensor signals are collected.

[0066] The sensor signals collected in the embodiments of the present application include one or more of the following: the balanced circuit board temperature Tb, the interlayer space temperature Tg, the battery module temperature Tc, and the battery module cell voltage Vc. The interlayer space temperature includes the temperature collected by a temperature sensor disposed within the interlayer space, or may also include the temperature collected by a temperature sensor disposed on the upper surface of the upper cover of the interlayer space at the bottom.

[0067] In S502 , when the sensing signal meets a preset wake-up condition, the sampler transmits a wake-up flag through a daisy chain circuit structure.

[0068] The sampler receives the sensor signals collected by the sensor components and compares them with corresponding thresholds to determine whether the received sensor signals are abnormal. If an abnormality occurs, a wake-up flag is transmitted to the listener through the communication interface of the listener via the daisy-chain circuit structure.

[0069] The sampler can be in a low-power sleep state during sampling and detection to reduce the power consumption of the battery management system.

[0070] In S503, the wake-up flag is converted into a wake-up signal by the listener to wake up the battery management system, so that the battery management system enters a continuous working mode.

[0071] After receiving the wake-up identifier through the communication interface, the listener can convert the wake-up identifier into a wake-up signal that can be recognized by the battery management system. The wake-up signal can be a wake-up signal based on the SPI protocol or a wake-up signal based on the UART protocol.

[0072] The battery management system is awakened after receiving the wake-up signal and enters the continuous working mode.

[0073] In S504, a sensor signal is collected in a continuous working mode, and an early warning signal is generated according to a preset early warning threshold and the sensor signal.

[0074] In continuous operation mode, the battery management system collects sensor signals by increasing the sampling frequency. The collected sensor signals include, but are not limited to, one or more of the following: the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the equalization circuit board temperature, and the equalization circuit board temperature change rate.

[0075] When the collected sensor signals include the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the balanced circuit board temperature, and the balanced circuit board temperature change rate, the collected sensor signals can be compared with the corresponding thresholds to determine whether the battery status is abnormal. When two of these are abnormal, an early warning signal can be generated to promptly respond to the battery thermal runaway anomaly. By setting the generation of early warning signals when two or more of the two are abnormal, the accuracy of early warning signal generation can be improved and the false alarm rate can be reduced.

[0076] The method is not limited to generating an early warning signal when two or more sensor signals are determined to be abnormal, and may also be set to generate an early warning signal when any one of the sensor signals is abnormal.

[0077] Example 2:

[0078] FIG6 is a schematic diagram of the circuit structure of another battery thermal runaway warning system provided in an embodiment of the present application. As shown in FIG6 , the circuit structure includes a sensor module 11, a sampler 12 without a reverse wake-up function, a monitor 13, a battery management system 14, and a sampling controller 15. The sensor module 11 includes, but is not limited to, a balanced circuit board temperature sensor 111, an interlayer temperature sensor 112, a module temperature sensor 113, and a battery cell voltage detection component 114. Without limitation to this, the sensors used may include a single sensor, two sensors, or more than two sensors.

[0079] The balancing circuit board temperature sensor 111 is used to collect the balancing circuit board temperature Tb, the interlayer temperature sensor 112 is used to detect the interlayer space temperature Tg, the module temperature sensor 113 is used to collect the module temperature Tc, and the battery cell voltage detection component 114 is used to detect the module cell voltage Vc. The sampler 12 can receive the sensor signals collected by the balancing circuit board temperature sensor 111, the interlayer temperature sensor 112, the module temperature sensor 113, and the battery cell voltage detection component 114 in sleep mode and transmit the collected sensor signals to the sampling controller 15. The sampling controller 15 determines whether the collected sensor signals are abnormal. For example, the sampling controller 15 can compare the collected balancing circuit board temperature Tb, the interlayer space temperature Tg, the battery module temperature Tc, and the battery module cell voltage Vc with the corresponding balancing circuit board temperature threshold Ttb, the interlayer space temperature threshold Ttb, the module temperature threshold Ttc, and the battery cell voltage Vtc, respectively. Based on the comparison results, it determines whether the battery management system 14 needs to be awakened and enter the continuous operation mode.

[0080] The listener 13 is used to convert the transmission signal transmitted by the daisy chain into a signal that can be recognized by the sampling controller. For example, it can convert the sensing signal into a wake-up signal based on the SPI (Serial Peripheral Interface) communication protocol or the UART (Universal Asynchronous Receiver / Transmitter) communication protocol. The listener 13 is used to provide a communication interface with the battery management system 14. When the sampling controller 15 detects an abnormal signal that may indicate that the battery is in a thermal runaway state, the sampling controller 15 wakes up the battery management system and puts it into continuous operation mode.

[0081] Multiple samplers 12 can be configured to collect sensor signals and transmit them to a sampling controller 15 via a daisy-chain circuit structure. The sampling controller 15 compares the sensor signals with corresponding thresholds to determine whether the sensor signals are abnormal. If the sensor signals are abnormal, the battery management system 14 is awakened and enters a continuous operation mode.

[0082] In continuous operation mode, the battery management system 14 can increase the sampling frequency and determine whether to generate a warning signal based on the sampled signal, thereby reducing losses based on the warning signal. For example, if a vehicle battery warning signal is generated, the warning signal can be used to notify passengers to leave the vehicle.

[0083] FIG7 is a schematic diagram of an implementation process of a battery thermal runaway warning method provided in an embodiment of the present application. As shown in FIG7 , the process includes:

[0084] In S701 , sensor signals are collected.

[0085] The sensor signals collected in the embodiments of the present application include one or more of the following: the balanced circuit board temperature Tb, the interlayer space temperature Tg, the battery module temperature Tc, and the battery module cell voltage Vc. The interlayer space temperature includes the temperature collected by a temperature sensor disposed within the interlayer space, or may also include the temperature collected by a temperature sensor disposed on the upper surface of the upper cover of the interlayer space at the bottom.

[0086] In S702, the sensing signal is acquired through a sampling controller.

[0087] When the sampler receives the sensor signals collected by the sensor assembly, it can transmit the sensor signals to the sampling controller via a daisy-chain circuit structure, or it can directly obtain the sensor signals collected by the sensor module. The sampling controller compares the received sensor signals with corresponding thresholds to determine whether the received sensor signals are abnormal. If an abnormality occurs, a wake-up signal can be generated.

[0088] Under normal operating conditions, the sampling controller consumes far less power than the battery management system's MCU. Therefore, by analyzing and judging sensor signals and waking up the battery management system's MCU in the event of an anomaly, the sampling controller can effectively reduce the battery management system's power consumption.

[0089] In S703 , the sampling controller wakes up the battery management system and enables the battery management system to enter a continuous operation mode.

[0090] The sampling controller analyzes and compares the detected sensor signals to determine whether there are any abnormalities. If there are any abnormalities, the MCU of the battery management system is awakened, causing the battery management system to enter a continuous operation mode.

[0091] In S704, a sensor signal is collected in a continuous working mode, and an early warning signal is generated according to a preset early warning threshold and the sensor signal.

[0092] In continuous operation mode, the battery management system collects sensor signals by increasing the sampling frequency. The collected sensor signals include, but are not limited to, one or more of the following: the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the equalization circuit board temperature, and the equalization circuit board temperature change rate.

[0093] When the collected sensor signals include the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the balanced circuit board temperature, and the balanced circuit board temperature change rate, the collected sensor signals can be compared with the corresponding thresholds to determine whether the battery status is abnormal. When two of these are abnormal, an early warning signal can be generated to promptly respond to the battery thermal runaway anomaly. By setting the generation of early warning signals when two or more of the two are abnormal, the accuracy of early warning signal generation can be improved and the false alarm rate can be reduced.

[0094] The method is not limited to generating an early warning signal when two or more sensor signals are determined to be abnormal, and may also be set to generate an early warning signal when any one of the sensor signals is abnormal.

[0095] Example 3:

[0096] Figure 8 is a schematic diagram of the circuit structure of another battery thermal runaway warning system provided in an embodiment of the present application. As shown in Figure 8, the circuit structure includes a sensor module 11, a sampler 12, a monitor 13, a battery management system 14, and a comparison module 16. The sensor module 11 includes, but is not limited to, a balanced circuit board temperature sensor 111, a barrier temperature sensor 112, a module temperature sensor 113, and a battery cell voltage detection component 114. Without limitation, the sensors used may include a single sensor, two sensors, or more than two sensors.

[0097] As shown in FIG8 , the comparison module 16 includes a comparator 161, a first voltage divider circuit 162, and a second voltage divider circuit 163. The first voltage divider circuit 162 includes a first constant resistor R1 and a thermistor R2, and the second voltage divider circuit 163 includes a second constant resistor R3 and a third constant resistor R4. The constant resistor end of the first voltage divider circuit 162 is connected to the power supply, and the thermistor end is connected to ground. This is not limiting; alternatively, the constant resistor end may be connected to ground, and the thermistor end may be connected to the power supply.

[0098] The connection point between the two resistors in the voltage divider circuit is the selection node for the comparator input voltage. Specifically, the selection node in the first voltage divider circuit 162 is the connection point between the first constant resistor R1 and the thermistor R2, while the selection node in the second voltage divider circuit 163 is the connection point between the second constant resistor R3 and the third constant resistor R4.

[0099] When the constant resistor is connected to the power supply and the thermistor is connected to the ground, if the temperature at the location where the thermistor is installed increases, the resistance of the thermistor decreases, and the first voltage at the selected node of the voltage divider circuit decreases. The second voltage at the voltage divider node determined by the second constant resistor R3 and the third constant resistor R4 is a constant value. That is, the first voltage input to the first input terminal of the comparator decreases as the temperature increases, while the second voltage input to the second input terminal is a constant value. The second voltage at the second input terminal is used as a reference value. When the first voltage changes from being greater than the second voltage to being less than the second voltage, the comparison result changes. The change in the comparison result of the comparator is used to monitor the temperature change at the location where the thermistor is installed.

[0100] When the temperature at the thermistor's mounting location rises, the comparator's output changes. When the battery management system detects this change, it switches the battery management system's MCU from sleep mode to continuous operation, increasing the frequency of sensor signal acquisition. The sensor signals collected by the sensor module are transmitted to the sampler via a daisy-chain circuit structure, and then to the monitor via a communication interface. After conversion and processing by the monitor, they are transmitted to the battery management system.

[0101] The input voltage of the comparator is not limited to the voltage at the voltage dividing node of the thermistor, but may also include the cell voltage of the battery, etc.

[0102] Among them, the sensing signals detected by the sensing module include the balanced circuit board temperature Tb detected by the balanced circuit board temperature sensor, the interlayer space temperature Tg detected by the interlayer temperature sensor, the mold temperature Tc detected by the module temperature sensor, and the mold cell voltage Vc detected by the battery cell voltage detection component.

[0103] In continuous operation mode, the battery management system can increase the sampling frequency and determine whether to generate a warning signal based on the sampled signal, thereby reducing losses based on the warning signal. For example, if a vehicle battery warning signal is generated, it can notify passengers to leave the vehicle based on the warning signal.

[0104] FIG9 is a schematic diagram of an implementation process of a battery thermal runaway warning method provided in an embodiment of the present application. As shown in FIG9 , the process includes:

[0105] In S901 , the comparison result is outputted by the comparator.

[0106] The comparator in the embodiment of the present application includes a first input terminal and a second input terminal. The first input terminal is used to input a detection signal, and the second input terminal is used to input a reference signal. A constant resistor can be used to construct a voltage divider circuit, and the voltage at the voltage divider node of the voltage divider circuit is used as the reference signal for the second input terminal. The input voltage of the second input terminal can be determined based on the change threshold to be monitored, so that when the first input terminal is less than or greater than the input voltage, the corresponding sensor signal value serves as the trigger condition for entering the continuous working mode.

[0107] A thermistor and a constant resistor can be connected in series to form a voltage divider circuit. The connection point between the two is used as a voltage divider node, and the temperature change in the battery compartment space can be monitored according to the voltage change of the voltage divider node.

[0108] Alternatively, the battery cell voltage may be input to the first input terminal of the comparator. In the thermal runaway state, the battery cell voltage decreases. When the battery cell voltage is less than the reference voltage at the second input terminal, the output result of the comparison changes.

[0109] In S902 , the battery management system is awakened according to the comparison result, so that the battery management system enters a continuous operation mode.

[0110] The comparator analyzes and compares the detected sensor signal to determine whether it is abnormal. If it is abnormal, the battery management system is awakened and enters the continuous working mode.

[0111] In S903 , the battery management system collects sensor signals in a continuous working mode and generates a warning signal according to a preset warning threshold and the sensor signals.

[0112] In continuous operation mode, the battery management system collects sensor signals by increasing the sampling frequency. The collected sensor signals include, but are not limited to, one or more of the following: the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the equalization circuit board temperature, and the equalization circuit board temperature change rate.

[0113] When the collected sensor signals include the temperature of the interlayer space, the battery cell voltage, the temperature change rate of the interlayer space, the battery cell voltage change rate, the module temperature, the module temperature change rate, the balanced circuit board temperature, and the balanced circuit board temperature change rate, the collected sensor signals can be compared with the corresponding thresholds to determine whether the battery status is abnormal. When two of these are abnormal, an early warning signal can be generated to promptly respond to the battery thermal runaway anomaly. By setting the generation of early warning signals when two or more of the two are abnormal, the accuracy of early warning signal generation can be improved and the false alarm rate can be reduced.

[0114] The method is not limited to generating an early warning signal when two or more sensor signals are determined to be abnormal, and may also be set to generate an early warning signal when any one of the sensor signals is abnormal.

[0115] Example 4:

[0116] FIG10 is a schematic diagram of the circuit structure of a thermal runaway warning system for a battery provided in an embodiment of the present application. As shown in FIG10 , the circuit structure includes a sensor module 11, a sampler 12 with a reverse wake-up function, a monitor 13, and a battery management system 14. The sensor module includes, but is not limited to, a balanced circuit board temperature sensor 111, an interlayer temperature sensor 112, a module temperature sensor 113, a battery cell voltage detection component 114, and a battery pack pressure monitoring sensor 115. Without limitation to this, the sensors used may include a single sensor, two sensors, or more than two sensors.

[0117] Among them, the balancing circuit board temperature sensor 111 is used to collect the balancing circuit board temperature Tb, the interlayer temperature sensor 112 is used to detect the interlayer space temperature Tg, the module temperature sensor 113 is used to collect the module temperature Tc, the battery cell voltage detection component 114 is used to detect the module cell voltage Vc, and the battery pack pressure monitoring sensor 115 is used to detect the air pressure P. The sampler 12 can receive the sensor signals collected by the balancing circuit board temperature sensor 111, the interlayer temperature sensor 112, the module temperature sensor 113, the battery cell voltage detection component 114, and the battery pack pressure monitoring sensor 115 in sleep mode, and determine whether the collected sensor signals are abnormal. For example, the sampler 12 may compare the collected balanced circuit board temperature Tb, interlayer space temperature Tg, battery module temperature Tc, and battery module cell voltage Vc with the corresponding balanced circuit board temperature threshold Ttb, interlayer space temperature threshold Ttb, module temperature threshold Ttc, and battery cell voltage Vtc, respectively; compare the interlayer space air pressure P with the air pressure threshold Tp; and compare the interlayer space air pressure change rate ΔP with a predetermined air pressure rate threshold. Based on the comparison results, it is determined whether a wake-up flag needs to be generated to wake up the listener 13.

[0118] Among them, the listener 13 is used to convert the wake-up identifier into a wake-up signal so that the converted wake-up signal can be recognized by the battery management system 14. For example, the wake-up identifier can be converted into a wake-up signal based on the SPI (Serial Peripheral interface) communication protocol, or a wake-up signal based on the UART (Universal Asynchronous Receiver / Transmitter) communication protocol. The listener 13 is used to provide a communication interface for communicating with the sampler. When the sampler detects an abnormal signal that the battery may be in a thermal runaway state, the listener 13 is awakened through the communication interface.

[0119] Multiple samplers can be set up to monitor the collected sensor signals, and through the daisy-chain circuit structure, the wake-up flag determined by the abnormal sensor signal can be transmitted to the listener 13 through the communication interface provided by the listener 13. After the listener 13 converts and processes the signal, it generates a wake-up signal and sends it to the battery management system 14 to wake up the battery management system 14, causing the battery management system 14 to enter the continuous operation mode.

[0120] In continuous operation mode, the battery management system 14 can increase the sampling frequency and determine whether to generate a warning signal based on the sampled signal, thereby reducing losses based on the warning signal. For example, if a vehicle battery warning signal is generated, the warning signal can be used to notify passengers to leave the vehicle.

[0121] Alternatively, the battery pack pressure monitoring sensor 115 may also directly wake up the battery management system 14 and enter the continuous operation mode when the battery pack pressure is detected to be greater than a predetermined pressure threshold. In the continuous operation mode, the sampling frequency of the battery pack pressure (ie, the pressure inside the battery pack) is increased.

[0122] The battery pack pressure monitoring sensor 115 can be used to monitor the pressure inside the battery module.

[0123] The purpose of adding a battery pack pressure monitoring sensor to the first embodiment is to ensure that, when the battery cells are connected in parallel, the battery cell voltage will remain essentially unchanged under thermal runaway conditions. If the high-temperature flue gas ejected by the thermal runaway valve does not flow through the thermistor, the detected temperature may not change significantly, and relying on a combination of temperature and battery cell voltage detection may result in missed reports of thermal runaway conditions. To avoid this drawback, air pressure detection is coupled with temperature detection and battery cell voltage detection, thereby waking up the battery management system in a timely manner and reducing the probability of missed reports of thermal runaway warnings.

[0124] In a possible implementation, a pressure monitoring sensor may be separately provided for monitoring and waking up the battery management system.

[0125] FIG11 is a schematic diagram of a process flow for implementing a battery thermal runaway warning method according to an embodiment of the present application. As shown in FIG11 , the process includes:

[0126] In S1101 , the pressure signal of the battery pack is collected.

[0127] This embodiment of the present application adds a battery pack pressure monitoring sensor to the first embodiment. The battery pack pressure monitoring sensor can be located within the interlayer space. To more effectively and reliably detect changes in air pressure, the battery pack pressure monitoring sensor can be located within the interlayer space, close to the explosion-proof valve, thereby more sensitively detecting changes in air pressure within the interlayer space caused by thermal runaway.

[0128] The sensor signals collected in the embodiments of the present application include one or more of the following: the balanced circuit board temperature Tb, the interlayer space temperature Tg, the battery module temperature Tc, and the interlayer space air pressure P. The interlayer space temperature may include the temperature collected by a temperature sensor disposed within the interlayer space, or may also include the temperature collected by a temperature sensor disposed on the upper surface of the upper cover of the interlayer space at the bottom.

[0129] In S1102 , when the pressure signal meets a preset wake-up condition, the battery pack pressure monitoring sensor transmits a wake-up flag to the battery management system and causes the battery management system to enter a continuous operation mode.

[0130] The battery pack pressure monitoring sensor collects the pressure signal inside the battery pack and compares it with the corresponding threshold to determine whether the received sensor signal is abnormal. If an abnormality occurs, a wake-up signal is sent to the MCU of the battery management system.

[0131] Comparing the pressure signal with the corresponding threshold value may include comparing the pressure signal with a predetermined pressure threshold value, or comparing the change speed of the pressure signal with a predetermined change speed threshold value.

[0132] In S1103, a sensor signal is collected in a continuous working mode, and an early warning signal is generated according to a preset early warning threshold and the sensor signal.

[0133] In continuous operation mode, the battery management system collects sensor signals by increasing the sampling frequency. The collected sensor signals include, but are not limited to, one or more of the following: the temperature of the interlayer space, the air pressure of the interlayer space, the temperature change rate of the interlayer space, the air pressure change rate of the interlayer space, the module temperature, the module temperature change rate, the balanced circuit board temperature, and the balanced circuit board temperature change rate.

[0134] When the collected sensor signals include the temperature of the interlayer space, the air pressure of the interlayer space, the temperature change rate of the interlayer space, the air pressure change rate of the interlayer space, the module temperature, the module temperature change rate, the balanced circuit board temperature, and the balanced circuit board temperature change rate, the collected sensor signals can be compared with the corresponding thresholds to determine whether the battery status is abnormal. When two of the two are abnormal, an early warning signal can be generated to promptly respond to the battery thermal runaway anomaly. By setting the generation of an early warning signal when two or more of the two are abnormal, the accuracy of the early warning signal generation can be improved and the false alarm rate can be reduced.

[0135] The method is not limited to generating an early warning signal when two or more sensor signals are determined to be abnormal, and may also be set to generate an early warning signal when any one of the sensor signals is abnormal.

[0136] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0137] FIG12 is a schematic diagram of a thermal runaway warning device for a battery provided in an embodiment of the present application. An interlayer space is provided at the end of the battery. The interlayer space is used to release smoke in the event of thermal runaway of the battery cell. As shown in FIG12 , the device includes:

[0138] A first collecting unit 1201 is configured to collect a first signal at the interlayer space;

[0139] A wake-up unit 1202 is configured to wake up the battery management system and enter a continuous operation mode when the first signal meets a preset wake-up condition;

[0140] The early warning unit 1203 is configured to collect a second flue gas signal in the continuous operation mode, and generate a thermal runaway early warning signal when the second flue gas signal meets a preset early warning condition.

[0141] The battery thermal runaway warning device shown in FIG12 corresponds to the battery thermal runaway warning method in the above embodiment.

[0142] Figure 13 is a schematic diagram of a battery provided in one embodiment of the present application. As shown in Figure 13, the battery 13 of this embodiment includes: a processor 130, a memory 131, and a computer program 132, such as a battery program, stored in the memory 131 and executable on the processor 130. When the processor 130 executes the computer program 132, it implements the steps of the aforementioned battery method embodiments. Alternatively, when the processor 130 executes the computer program 132, it implements the functions of the modules / units in the aforementioned device embodiments.

[0143] Exemplarily, the computer program 132 may be divided into one or more modules / units, which are stored in the memory 131 and executed by the processor 130 to implement the present application. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program 132 in the battery 13.

[0144] The battery may include, but is not limited to, a processor 130 and a memory 131. Those skilled in the art will appreciate that FIG13 is merely an example of the battery 13 and does not limit the battery 13. The battery 13 may include more or fewer components than shown in the figure, or may combine certain components or different components. For example, the battery may also include input and output devices, network access devices, buses, etc.

[0145] The processor 130 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0146] The memory 131 may be an internal storage unit of the battery 13, such as a hard drive or memory of the battery 13. The memory 131 may also be an external storage device of the battery 13, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the battery 13. Furthermore, the memory 131 may include both an internal storage unit of the battery 13 and an external storage device. The memory 131 is used to store the computer program and other programs and data required by the battery. The memory 131 may also be used to temporarily store data that has been output or is about to be output.

[0147] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0148] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0149] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0150] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0151] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0152] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0153] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, which can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0154] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A thermal runaway early warning method for a battery, characterized in that: The battery is provided with an accommodation space, and the accommodation space is used to discharge smoke in the event of thermal runaway of a cell of the battery. The method comprises: Acquiring a detection signal at a detection position including the accommodating space; A thermal runaway warning signal is generated according to the detection signal.

2. The method according to claim 1, characterized in that The accommodating space includes one or more of the compartment space of the battery and the inner space of the hollow beam structure of the battery.

3. The method according to claim 2, characterized in that In the case where the accommodating space includes a partition space of the battery, the detection position includes any position in the partition space and / or an inner surface of the partition space.

4. The method according to any one of claims 1 to 3, characterized in that: The detection signal includes a first signal and a second signal; Acquiring a detection signal at a detection position including the accommodating space includes: Acquire a first signal at a detection position including the accommodating space; When the first signal satisfies a preset wake-up condition, the battery management system is awakened, and the battery management system obtains a second signal; The sampling frequency of the second signal is greater than the sampling frequency of the first signal.

5. The method according to claim 4, characterized in that The first signal includes one or more of a temperature signal and an air pressure signal whose detection position is located in the accommodating space.

6. The method according to claim 4, characterized in that The first signal further includes one or more of a battery voltage, a temperature of a balancing circuit board of the battery, and a cell temperature of the battery.

7. The method according to claim 4, characterized in that The second signal includes two or more of a temperature signal at the accommodating space, an air pressure signal at the accommodating space, a temperature change rate at the accommodating space, a pressure change rate at the accommodating space, a battery cell voltage of the battery, a battery cell temperature of the battery, a temperature change rate of the battery cell, a temperature of a balancing circuit board of the battery, and a temperature change rate of the balancing circuit board of the battery.

8. The method according to claim 7, characterized in that Generating a thermal runaway warning signal according to the detection signal includes: When two or more of the second signals meet the preset warning requirements, a thermal runaway warning signal is generated.

9. The method according to any one of claims 4 to 8, characterized in that: Acquiring a detection signal at a detection position including the accommodating space includes: Monitor the first signal by a monitor having a host wake-up function; When the first signal meets a preset wake-up condition, the monitor wakes up the battery management system from sleep mode to normal working mode, and the battery management system obtains the second signal in the normal working mode.

10. The method according to any one of claims 4 to 8, characterized in that: Acquiring a detection signal at a detection position including the accommodating space includes: sampling the first signal in a low power consumption mode by a sampling controller; When the first signal meets the preset wake-up condition, the battery management system is awakened by the sampling controller to enter the normal working mode, and the sampling controller is switched from the low power consumption mode to the normal working mode, and the battery management system controls the sampling controller to obtain the second signal in the normal working mode.

11. The method according to any one of claims 4 to 8, characterized in that: Acquiring a detection signal at a detection position including the accommodating space includes: comparing the first signal with a preset threshold signal; When the comparison result meets the preset wake-up condition, the battery management system is triggered to enter the normal working mode from the sleep mode, and the battery management system controls the sampler to obtain the second signal in the normal working mode.

12. The method according to any one of claims 4 to 8, characterized in that: When the battery cells are in a parallel structure, the first signal includes an air pressure signal and / or a temperature signal, and the collection position of the air pressure signal and / or the temperature signal includes the accommodating space.

13. A thermal runaway warning device for a battery, characterized in that: The battery is provided with an accommodation space, and the accommodation space is used to discharge smoke in the event of thermal runaway of a cell of the battery. The method comprises: A detection signal acquisition unit, used to acquire a detection signal at a detection position including the accommodating space; The early warning unit is used to generate a thermal runaway early warning signal according to the detection signal.

14. A battery comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 12 are implemented.

15. A computer-readable storage medium storing 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 1 to 12 are implemented.

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