Thermal runaway management method of battery device, thermal runaway management system and electric equipment

Abstract

The invention provides a thermal runaway management method, a thermal runaway management system and electric equipment of a battery device, and the thermal runaway management method of the battery device comprises the steps: responding to the completion of power-off of the electric equipment adopting the battery device, and entering a primary sleep mode; the primary sleep mode comprises waking up the first sensor according to a first preset frequency and not waking up the second sensor; in response to the condition that the time for entering the primary sleep mode meets a first time threshold, entering a deep sleep mode; the deep sleep mode comprises waking up the first sensor according to a second preset frequency and not waking up the second sensor; wherein the first sensor and the second sensor are both used for collecting parameters of the battery device, and the power consumption of the first sensor is smaller than that of the second sensor. Through the mode, the consumption of electric energy is reduced, and the possibility of feeding of the standby battery of the vehicle is reduced, so that the detection probability when thermal runaway occurs can be improved, and the reliability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to a thermal runaway management method, a thermal runaway management system, and an electrical device for a battery device. Background Art

[0002] With the wide application of power batteries, the problem of thermal runaway of batteries has gradually emerged. Therefore, how to manage the thermal runaway of batteries and give timely warnings is crucial for ensuring the reliability of battery systems. Summary of the Invention

[0003] The main technical problem to be solved by the present application is to provide a thermal runaway management method, a thermal runaway management system, and an electrical device for a battery device, so as to monitor whether the battery device has a thermal runaway and improve the reliability of the battery device.

[0004] To solve the above technical problem, in a first aspect, a technical solution adopted by the present application is to provide a thermal runaway management method for a battery device, including: In response to the power-off of the electrical device using the battery device being completed, enter the primary sleep mode; the primary sleep mode includes waking up the first sensor at a first preset frequency and not waking up the second sensor; In response to the time of entering the primary sleep mode meeting a first time threshold, enter the deep sleep mode; the deep sleep mode includes waking up the first sensor at a second preset frequency and not waking up the second sensor; Wherein, both the first sensor and the second sensor are used to collect parameters of the battery device, and the power consumption of the first sensor is less than that of the second sensor.

[0005] In the above technical solution, in the primary sleep mode, only the low-power first sensor is woken up at the first preset frequency, with fast response, short wake-up period, reduced power consumption, and reduced possibility of the vehicle's backup battery running out of power, thereby increasing the detection probability when a thermal runaway occurs and improving the reliability of the battery device; by adopting a phased sleep mode strategy, in the initial stage with a high risk of thermal runaway, frequent monitoring is maintained; subsequently, the monitoring frequency is gradually reduced to save energy and extend the battery life, reducing power consumption, improving the effectiveness of thermal runaway management, and further improving the reliability of the battery device.

[0006] In some of these embodiments, the first sensor includes at least one of a pressure sensor, a temperature sensor, and a smoke sensor; the second sensor includes at least one of a volatile organic compound sensor and a carbon monoxide sensor.

[0007] In the above technical solution, the pressure sensor, temperature sensor, and smoke sensor have low power consumption and it is easy to achieve a stable output value; the volatile organic compound sensor and carbon monoxide sensor take a relatively long time to stably output parameters and have relatively high power consumption. Thus, the pressure sensor, temperature sensor, and smoke sensor can be used in a low-power thermal runaway sensor wake-up scheme. By waking up the pressure sensor, temperature sensor, and smoke sensor at a high frequency, the detection probability when thermal runaway occurs can be increased, and the reliability of the battery device can be improved.

[0008] In some embodiments, the first sensor includes a first sub-sensor and a second sub-sensor, and the change rate of the parameter collected by the first sub-sensor is greater than the change rate of the parameter collected by the second sub-sensor. Among them, waking up the first sensor according to the first preset frequency includes: waking up the first sub-sensor according to the first preset sub-frequency and waking up the second sub-sensor according to the second preset sub-frequency; wherein, the first preset sub-frequency is greater than the second preset sub-frequency.

[0009] In the above technical solution, the corresponding wake-up preset frequency is set according to the magnitude of the change rate of the parameter collected by the sub-sensor. Among them, the first sub-sensor is woken up according to the first preset sub-frequency. Since the change rate of the parameter it collects is large, the wake-up frequency is high to timely capture the parameter change; the second sub-sensor is woken up according to the second preset sub-frequency. Since the change rate of the parameter it collects is small, the wake-up frequency is relatively low, which can reduce power consumption and improve efficiency.

[0010] In some embodiments, the first sub-sensor includes at least one of a pressure sensor and a smoke sensor; the second sub-sensor includes a temperature sensor.

[0011] In the above technical solution, in the battery monitoring system, according to the characteristics of the change rate of the parameters collected by each sensor, the system resources are reasonably allocated, the power consumption is reduced, and the monitoring efficiency is improved.

[0012] In some embodiments, the first sub-sensor is woken up once every 10s - 20s; the second sub-sensor is woken up once every 20s - 30s.

[0013] In the above technical solution, the power consumption can be reduced, and the timeliness and reliability of the thermal runaway management method can be improved.

[0014] In some embodiments, the first sensor is woken up once every 10s - 30s; the first sensor is woken up once every 40s - 120s.

[0015] In the above technical solution, the first preset frequency is greater than the second preset frequency. Within this range, it is possible to better monitor whether thermal runaway of the battery device occurs, improve the reliability of the battery device, and avoid wasting energy.

[0016] In some embodiments, the first time threshold is 48 hours - 96 hours.

[0017] In the above technical solution, setting the first time threshold to 48 hours - 96 hours can capture parameter changes in a timely manner and perform thermal runaway monitoring more effectively.

[0018] In some embodiments, in response to the power of the backup battery being lower than the first power threshold, power on the electrical device using the battery device and charge the backup battery.

[0019] In the above technical solution, in response to the power of the backup battery being lower than the first power threshold, power on the electrical device using the battery device and charge the backup battery, which can reduce the risk of the vehicle's backup battery running out of power.

[0020] In some embodiments, in response to the power of the battery device being lower than the second power threshold, send a reminder message to the user.

[0021] In the above technical solution, the risk of the vehicle running out of power can be further reduced, and the reliability of the battery device can be further improved.

[0022] In some embodiments, the thermal runaway management method of the battery device further includes: Collect parameters of the battery device through the first sensor; the parameters include at least one of a pressure parameter, a temperature parameter, and a smoke parameter; In response to at least one of the pressure parameter satisfying the first pressure threshold, the temperature parameter satisfying the first temperature threshold, and the temperature parameter satisfying the temperature rise threshold being established, wake up the battery control unit.

[0023] In the above technical solution, the battery control unit is woken up only when at least one of the pressure parameter satisfying the first pressure threshold, the temperature parameter satisfying the first temperature threshold, and the temperature parameter satisfying the temperature rise threshold is established for further judging the thermal runaway level. In this way, power consumption can be reduced.

[0024] In some embodiments, the thermal runaway management method of the battery device further includes: Collect parameters of the battery device through the first sensor; In response to the parameter satisfying the first threshold condition, start a secondary alarm mode; the secondary alarm mode includes giving an alarm prompt and waking up the battery control unit; In response to the parameter satisfying the second threshold condition, a three - level alarm mode is activated; the three - level alarm mode includes giving an alarm prompt and activating a manual fire - extinguishing mode; the requirements of the second threshold condition are higher than those of the first threshold condition. In response to the parameter satisfying the third threshold condition, a four - level alarm mode is activated; the four - level alarm mode includes giving an alarm prompt and activating an automatic fire - extinguishing mode; the requirements of the third threshold condition are higher than those of the second threshold condition.

[0025] In the above - mentioned technical solution, for different periods of thermal runaway, alarms of different levels are given and different fire - extinguishing system actions are executed, making the alarm more targeted and timely, thereby improving the reliability of the battery device.

[0026] In some of the embodiments, the parameter includes at least one of a pressure parameter, a temperature parameter, and a smoke parameter. The first threshold condition includes that at least one of the following conditions holds: the pressure parameter satisfies a first pressure threshold, the temperature parameter satisfies a first temperature threshold, and the temperature parameter satisfies a temperature - rise threshold. The second threshold condition includes that at least two of the following conditions hold: the pressure parameter satisfies a second pressure threshold, the temperature parameter satisfies a second temperature threshold, the temperature parameter satisfies the temperature - rise threshold, and the smoke parameter satisfies a smoke threshold; the second pressure threshold is higher than the first pressure threshold, and the second temperature threshold is higher than the first temperature threshold. The third threshold condition includes that at least three of the following conditions hold: the pressure parameter satisfies a third pressure threshold, the temperature parameter satisfies a third temperature threshold, the temperature parameter satisfies the temperature - rise threshold, and the smoke parameter satisfies the smoke threshold, and the at least three conditions holding includes the temperature parameter satisfying the third temperature threshold; the third pressure threshold is higher than the second pressure threshold, and the third temperature threshold is higher than the second temperature threshold.

[0027] In the above - mentioned technical solution, the judgment conditions for the second level include parameters such as temperature, temperature rise, and pressure, and require at least two conditions to hold, reducing misjudgment caused by a single condition; the judgment conditions for the third level include temperature, temperature rise, pressure, and smoke parameters, and require at least two conditions to hold, which can more comprehensively evaluate risks. The third level considers multiple data indicators, can monitor and give early warnings in a timely manner, and improves the reliability of the battery device; the conditions for the fourth level require at least three conditions to hold and the temperature must meet the standard, reducing the probability of false alarms and improving the reliability of the thermal runaway management of the battery device.

[0028] In some of the embodiments, the method for thermal runaway management of the battery device further includes: In response to the temperature parameter satisfying the second temperature threshold, the second - level alarm mode is activated. In response to the temperature parameter satisfying the third temperature threshold, activate the three - level alarm mode; In response to the temperature parameter satisfying the fourth temperature threshold, activate the four - level alarm mode; wherein, the fourth temperature threshold is higher than the third temperature threshold.

[0029] In the above technical solution, for all levels of alarms, a temperature gradient alarm logic of a higher alarm level is set as the guaranteed alarm logic for each level of alarm, preventing that in the worst - case scenario, all sensors fail and the temperature threshold can still be used as a reference for alarm.

[0030] To solve the above - mentioned technical problems, in a second aspect, another technical solution adopted by this application is to provide a thermal runaway management system for a battery device, including: A first sensor and a second sensor, both used to collect parameters of the battery device; the power consumption of the first sensor is less than that of the second sensor; A fire - extinguishing host, communicatively connected to the first sensor and the second sensor, and used to execute the thermal runaway management method for the battery device provided in any one of the above embodiments.

[0031] In the above technical solution, in the primary sleep mode, only the low - power - consumption first sensor is awakened at a first preset frequency, with fast response and short wake - up period, reducing power consumption, decreasing the possibility of the vehicle's backup battery running out of power, thereby increasing the detection probability when thermal runaway occurs and improving the reliability of the battery device; by adopting a phased sleep - mode strategy, in the initial stage with a relatively high risk of thermal runaway, more frequent monitoring is maintained; subsequently, the monitoring frequency is gradually reduced to save energy and extend the battery life, reducing power consumption, improving the effectiveness of thermal runaway management, and further increasing the reliability of the battery device.

[0032] To solve the above - mentioned technical problems, in a third aspect, another technical solution adopted by this application is to provide an electrical equipment, including: A battery device, used to provide power for the electrical equipment; The thermal runaway management system for the battery device provided in the second - aspect embodiment above; A backup battery, used to supply power to the thermal runaway management system of the battery device when the electrical equipment is powered off.

[0033] In the above technical solution, in the primary sleep mode, only the low-power first sensor is awakened at the first preset frequency, with fast response and short wake-up period, reducing power consumption and the possibility of the vehicle's backup battery running out of power, thereby increasing the detection probability during thermal runaway and improving the reliability of the battery device; by adopting a phased sleep mode strategy, in the initial stage with a high risk of thermal runaway, relatively frequent monitoring is maintained; subsequently, the monitoring frequency is gradually reduced to save energy and extend the battery life, reducing power consumption, improving the effectiveness of thermal runaway management, and further enhancing the reliability of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 Flowchart of the thermal runaway management method for the battery device provided by some embodiments of the present application; Figure 2 Structural schematic diagram of the battery device provided by some embodiments of the present application; Figure 3 Exploded structural schematic diagram of the battery cell provided by some embodiments of the present application; Figure 4 Thermal runaway management method for the battery device provided by some other embodiments of the present application; Figure 5 Thermal runaway management method for the battery device provided by some other embodiments of the present application; Figure 6 Partial circuit diagram of the thermal runaway management system for the battery device provided by some embodiments of the present application; Figure 7 Structural schematic diagram of the electrical equipment provided by some embodiments of the present application.

[0036] Explanation of the reference numerals in the drawings: 100 - battery device, 10 - battery box, 11 - first part, 12 - second part, 20 - battery cell, 21 - end cap, 21a - electrode terminal, 22 - housing, 23 - electrode assembly, 23a - tab, 24 - connecting member, 25 - pressure relief mechanism, 200 - first sensor, 300 - second sensor, 400 - fire extinguishing host, 500 - fire extinguishing device, 600 - battery monitoring unit, 700 - BMU, 800 - instrument, 900 - switch, 1000 - thermal runaway management system of the battery device, 2000 - electrical equipment, 3000 - backup battery. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above accompanying drawing description are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0039] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more (including two), such as two, three, etc., unless otherwise specifically defined. Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0041] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship between components based on the relative orientation or positional relationship shown in the drawings in a specific posture (as shown in the drawings). This is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0044] Battery thermal runaway refers to an accumulative enhancement effect of the battery current and battery temperature, which gradually causes damage. For example, in a common lead-acid battery, since there is no gap filled with liquid between the positive and negative plates, the oxygen generated at the positive electrode during charging cannot reach the negative electrode, so the negative electrode is not depolarized and hydrogen is more likely to be generated and escape from the battery along with oxygen, resulting in battery thermal runaway. Another example is that when the oxygen circulation gas path inside a lead-acid battery is too smooth, the oxygen released from the positive electrode plate directly acts on the negative electrode plate for oxygen circulation, and the generated heat cannot be discharged in time, leading to battery thermal runaway. Another example is that when a single battery cell in a lead-acid battery pack fails in advance during use, when the battery is charged and the charging constant voltage remains unchanged, the voltage of the prematurely failed battery cell does not rise or rises very slowly, prolonging the charging time. This will cause the voltage of the good battery cells to be relatively too high, and it will also cause this single battery cell or the entire battery pack to heat up due to overcharging, resulting in battery thermal runaway.

[0045] The issues of energy and environment are major challenges faced by all mankind. Establishing a clean and renewable new energy system has become an inevitable choice for human society. With the booming development of the industry, while the energy density of battery devices has been improved, potential chemical instability has also been brought. For example, the occurrence of thermal runaway in battery devices may lead to major safety accidents such as vehicle spontaneous combustion and energy storage substation fires. Therefore, how to improve the reliability of battery devices and obtain thermal runaway information of battery devices in advance has become a hot topic and a difficult problem of key concern.

[0046] In the related art, since there is a limit on the maximum power consumption of the system after the vehicle is powered off, if the wake-up scheme has a too long start-up period, it may lead to an increased risk of not reporting a thermal runaway; and if high-power components such as a wake-up microcontroller unit (MCU) are woken up more frequently, it may cause the vehicle's backup battery to run out of power.

[0047] Through research, it is found that due to the characteristics of different sensors, for example, carbon monoxide (chemical formula CO) sensors and volatile organic compounds (VOC) sensors, due to the electrochemical principle, it takes a relatively long time to stably output parameters, while for pressure sensors, temperature sensors, and smoke sensors, due to their low sensor power consumption, they can output reliable parameters with less time and less power.

[0048] Therefore, the embodiment of the present application provides a thermal runaway management method for a battery device using the low power consumption of different composite sensors. The thermal runaway management method of the battery device includes: in response to the power-off of the electrical device using the battery device being completed, entering a primary sleep mode; the primary sleep mode includes waking up the first sensor at a first preset frequency and not waking up the second sensor; in response to the time of entering the primary sleep mode satisfying a first time threshold, entering a deep sleep mode; the deep sleep mode includes waking up the first sensor at a second preset frequency and not waking up the second sensor; wherein, both the first sensor and the second sensor are used to collect parameters of the battery device, and the power consumption of the first sensor is less than that of the second sensor.

[0049] In this embodiment, in the primary sleep mode, only the low-power first sensor is woken up at the first preset frequency, with a fast response and a short wake-up period, reducing the power consumption, reducing the possibility of the vehicle's backup battery running out of power, thereby increasing the detection probability when a thermal runaway occurs and improving the reliability of the battery device; by adopting a phased sleep mode strategy, in the initial stage with a relatively high risk of thermal runaway, frequent monitoring is maintained; subsequently, the monitoring frequency is gradually reduced to save energy and extend the battery life, reducing the power consumption, improving the effectiveness of thermal runaway management, and further improving the reliability of the battery device.

[0050] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0051] Please refer to Figure 1 and Figure 2 , where Figure 1 is a flowchart of the thermal runaway management method of the battery device 100 provided by some embodiments of the present application; Figure 2 is a schematic structural diagram of the battery device 100 provided by some embodiments of the present application.

[0052] The thermal runaway management method of the battery device 100 provided by the embodiment of the present application includes: Step S101: In response to the power-off of the electrical device using the battery device 100 being completed, enter the primary sleep mode; the primary sleep mode includes waking up the first sensor at a first preset frequency without waking up the second sensor; wherein, both the first sensor and the second sensor are used to collect parameters of the battery device 100, and the power consumption of the first sensor is less than that of the second sensor.

[0053] Among them, the battery device 100 can be a power battery, which can be a core energy storage device that provides driving energy for electrical devices such as electric vehicles and electric ships. In some embodiments, the battery device 100 can be arranged at the bottom, head or tail of the electric vehicle to supply power to the electric vehicle.

[0054] Since thermal runaway of electric vehicles mostly occurs after the vehicle finishes charging or after the vehicle goes to sleep after driving, therefore, after the battery device 100 finishes charging, or when the power-off of the electrical device using the battery device 100 is completed, the battery management system enters the primary sleep mode for monitoring, and wakes up the fire extinguishing host at a preset frequency without waking up the Battery Management Unit (BMU for short) to reduce power consumption.

[0055] The battery device 100 provided by this embodiment includes a battery box 10 and a plurality of battery cells 20; the plurality of battery cells 20 are arranged in the battery box 10.

[0056] Among them, the battery box 10 is used to provide an accommodation space for the battery cells 20, and the battery box 10 can adopt various structures. In some embodiments, the battery box 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define the accommodation space. The second part 12 can be a hollow structure with one end open, the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define the accommodation space; the first part 11 and the second part 12 can also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the battery box 10 formed by the first part 11 and the second part 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0057] In the battery device 100, several (two or more) battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among several battery cells 20. Several battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by several battery cells 20 is accommodated in the battery box 10. Of course, the battery device 100 can also be that several battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the battery box 10. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection among several battery cells 20.

[0058] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc.

[0059] Please refer to Figure 3 , Figure 3 which is a schematic exploded view of the battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. As Figure 3 , the battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0060] The end cap 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 21 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved stability. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminals 21a can be used for electrically connecting to the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, the battery cell 20 further includes a connection member 24. Each electrode terminal 21a is correspondingly provided with a connection member 24, or it can also be called a current collecting member, which is located between the end cap 21 and the electrode assembly 23 and is used to electrically connect the electrode assembly 23 and the electrode terminals 21a. In some embodiments, a pressure relief mechanism 25 for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap 21. The material of the end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 21. The insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0061] The housing 22 is a component for cooperating with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 is covered at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap 21 and the housing 22 can also be integrated. Specifically, the end cap 21 and the housing 22 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 22, the end cap 21 is then covered on the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0062] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 23, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 23a. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 23a are connected to the electrode terminals 21a to form a current loop.

[0063] A sensor is an electronic device that monitors and collects parameters of the battery device 100, and can also be referred to as a detector or a sensor. The sensor collects parameters inside the battery box 10 and outside the battery cell 20, that is, the parameters of the battery device 100 do not include the parameters inside the battery cell 20, such as voltage, current, etc. When the power-consuming device using the battery device 100 is powered off, a low-power mode can be adopted to manage the thermal runaway of the battery device 100.

[0064] Among them, the power consumption of the first sensor is less than that of the second sensor. The high-power-consuming second sensor has a longer wake-up time, and the low-power-consuming first sensor has a shorter wake-up time. The first sensor is woken up according to a first preset frequency, and the second sensor is not woken up, which can reduce the power consumption. The first preset frequency can be to wake up the first sensor once every 10s - 30s.

[0065] In this way, in the primary sleep mode, only the low-power-consuming first sensor is woken up according to the first preset frequency, with fast response and short wake-up period, reducing the power consumption, reducing the possibility of the vehicle's backup battery running out of power, and thus increasing the detection probability when thermal runaway occurs and improving the reliability of the battery device 100.

[0066] Furthermore, in some embodiments, the first sensor includes at least one of a pressure sensor, a temperature sensor, and a smoke sensor; the second sensor includes at least one of a volatile organic compounds (VOC) sensor and a carbon monoxide (chemical formula CO) sensor.

[0067] Specifically, according to the different parameters of the battery device 100 monitored and collected, the sensors are classified into a pressure sensor, a temperature sensor, a smoke sensor, a VOC sensor, and a CO sensor.

[0068] Among them, the pressure sensor, also known as the barometric pressure sensor, is used to detect the air pressure change inside the battery device 100. Its working principle is usually based on the piezoresistive effect of semiconductor strain gauges. When the ambient air pressure changes, the pressure sensor will detect this change and convert it into an electrical signal. The Microcontroller Unit (MCU) determines the gas concentration by judging the voltage signal, and thus determines the alarm information.

[0069] The temperature sensor is used to detect the temperature inside the battery device 100, and it utilizes the characteristic that the resistance value of the thermistor changes with temperature. The temperature sensor can be a Negative Temperature Coefficient (NTC) sensor. The NTC thermistor is a kind of negative temperature coefficient thermistor, and its resistance value decreases as the temperature rises. Through the voltage divider circuit, the output voltage after the NTC is voltage-divided is collected. The MCU determines the temperature by judging the voltage signal, and thus determines the alarm information.

[0070] The smoke sensor is used to detect the smoke concentration inside the battery device 100. In some embodiments, the smoke sensor adopts a photoelectric measurement system and uses the optical dual-wavelength technology for smoke detection. The smoke is scattered by the dual-wavelength LED to the PD, and the smoke detection is realized by the change in light intensity. The MCU determines the smoke concentration by judging the signal transmitted through the Serial Peripheral Interface (SPI) communication, and thus determines the alarm information.

[0071] The VOC sensor is used to detect the VOC gas concentration inside the battery pack. It utilizes the semiconductor principle of the sensor. If the detected gas exists in the ambient air, the conductivity of the VOC sensor will change, and the change in the conductivity of the VOC sensor will be converted into a voltage output signal corresponding to the VOC gas concentration. The MCU determines the gas concentration by judging the voltage signal, and thus determines the alarm information.

[0072] The CO sensor is used to detect the CO gas concentration inside the battery pack. It utilizes the electrochemical principle of the sensor. If the detected gas exists in the ambient air, the detected gas will undergo a chemical reaction on the reaction electrode of the CO sensor, resulting in a change in the output current of the CO sensor. The output current of the CO sensor and the resistance at the back end are converted into a voltage signal, and the voltage signal is amplified by an operational amplifier, and then converted into a voltage output signal corresponding to the gas concentration. The MCU determines the CO gas concentration by judging the voltage signal, and thus determines the alarm information.

[0073] In this embodiment, the pressure sensor, temperature sensor, and smoke sensor have low power consumption and it is easy to achieve a stable output value; the VOC sensor and CO sensor take a long time to stably output parameters and have relatively high power consumption. Thus, the pressure sensor, temperature sensor, and smoke sensor can be used in a low-power thermal runaway sensor wake-up scheme. By waking up the pressure sensor, temperature sensor, and smoke sensor at a high frequency, the detection probability when thermal runaway occurs can be increased, and the reliability of the battery device 100 can be improved.

[0074] Further, in some embodiments, the first sensor includes a first sub-sensor and a second sub-sensor, and the change rate of the parameter collected by the first sub-sensor is greater than the change rate of the parameter collected by the second sub-sensor. Wherein, waking up the first sensor according to the first preset frequency includes: waking up the first sub-sensor according to the first preset sub-frequency and waking up the second sub-sensor according to the second preset sub-frequency; wherein, the first preset sub-frequency is greater than the second preset sub-frequency.

[0075] Specifically, since the first sub-sensor has a high monitoring parameter change rate, a relatively high wake-up frequency (the first preset sub-frequency) is set so that the system can collect data in a timely manner, quickly capture the rapid change of the parameter, and thus quickly respond to potential abnormalities. Since the second sub-sensor has a low monitoring parameter change rate, a relatively low wake-up frequency (the second preset sub-frequency) is set, which can reduce the system power consumption and data processing burden and improve efficiency.

[0076] Thus, the corresponding wake-up preset frequency is set according to the magnitude of the change rate of the parameter collected by the sub-sensor. Among them, the first sub-sensor is woken up according to the first preset sub-frequency. Since the change rate of the parameter it collects is large, the wake-up frequency is high to quickly capture the parameter change; the second sub-sensor is woken up according to the second preset sub-frequency. Since the change rate of the parameter it collects is small, the wake-up frequency is relatively low, which can reduce power consumption and improve efficiency.

[0077] Further, in some embodiments, the first sub-sensor includes at least one of a pressure sensor and a smoke sensor; the second sub-sensor includes a temperature sensor.

[0078] Wherein, the change rate of the parameter collected by the pressure sensor and the smoke sensor is greater than the change rate of the temperature parameter collected by the temperature sensor.

[0079] When thermal runaway occurs, the pressure measured by the pressure sensor may change rapidly due to processes such as gas generation and release within the battery device 100, with significant fluctuations and a high change rate within a short period of time. The smoke concentration measured by the smoke sensor may increase rapidly due to factors such as battery thermal runaway, with large fluctuations and a high change rate within a short period of time, and a higher acquisition frequency is required to improve reliability. The temperature measured by the temperature sensor may be relatively stable, with a slow changing trend even if it changes, and a low change rate, so the acquisition frequency can be lower to further reduce power consumption.

[0080] In this way, in the battery monitoring system, according to the characteristics of the change rates of the parameters collected by each sensor, system resources are reasonably allocated to reduce power consumption and improve monitoring efficiency.

[0081] Furthermore, in some embodiments, the first preset sub-frequency wakes up the first sub-sensor once every 10s - 20s; the second preset sub-frequency wakes up the second sub-sensor once every 20s - 30s.

[0082] Among them, the first preset sub-frequency wakes up the first sub-sensor once every 10s - 20s. For example, it can wake up the first sub-sensor once every 10s, 15s, or 20s. The second preset sub-frequency wakes up the second sub-sensor once every 20s - 30s. For example, it can wake up the first sub-sensor once every 20s, 25s, or 30s.

[0083] In this embodiment, the first preset sub-frequency wakes up the first sub-sensor once every 10s - 20s; the second preset sub-frequency wakes up the second sub-sensor once every 20s - 30s, which can reduce power consumption and improve the timeliness and reliability of the thermal runaway management method.

[0084] Furthermore, in some embodiments, in response to the time of entering the primary sleep mode satisfying the first time threshold, enter the deep sleep mode; the deep sleep mode includes waking up the first sensor according to the second preset frequency without waking up the second sensor.

[0085] The time of the primary sleep mode satisfying the first time threshold indicates that the parameters collected by the first sensor show that the battery device 100 is in a safe state. Since the thermal runaway of the battery device 100 mostly occurs within several hours or dozens of hours after charging is completed or after powering off after driving, after charging is completed or after powering off after driving, first perform long-term monitoring of the first time threshold, that is, continuously monitor the parameters of the first sensor for the first time threshold, and collect parameters during the monitoring process. When the risk of thermal runaway exceeds the first time threshold and decreases, the deep sleep mode can be entered at this time, thereby further reducing power consumption.

[0086] In this way, by adopting a phased sleep mode strategy, frequent monitoring is maintained in the initial stage with a high risk of thermal runaway; subsequently, the monitoring frequency is gradually reduced to save energy and extend the battery life, reduce power consumption, improve the effectiveness of thermal runaway management, and thus improve the reliability of the battery device 100.

[0087] Further, in some embodiments, the first preset frequency wakes up the first sensor once every 10s - 30s; the second preset frequency wakes up the first sensor once every 40s - 120s.

[0088] Among them, the first preset frequency wakes up the first sensor once every 10s - 30s, for example, it can wake up the first sensor once every 10s, 15s, 20s, 25s, or 30s. The second preset frequency wakes up the first sensor once every 40s - 120s, for example, it can wake up the first sensor once every 40s, 45s, 50s, 55s, 60s, 65s, 70s, 75s, 80s, 85s, 90s, 95s, 100s, 105s, 110s, 115s, or 120s.

[0089] In this way, the first preset frequency is greater than the second preset frequency. Within this range, it can not only monitor whether the battery device 100 has a thermal runaway well, improve the reliability of the battery device 100, but also avoid wasting energy.

[0090] Further, in some embodiments, the first time threshold is 48 hours - 96 hours.

[0091] Among them, the first time threshold can be 48 hours, 54 hours, 60 hours, 66 hours, 72 hours, 78 hours, 84 hours, 90 hours, 96 hours, etc.

[0092] The thermal runaway of the battery device 100 is likely to occur within 48 hours after charging is completed or the power is turned off after driving. In this way, setting the first time threshold to 48 hours - 96 hours can capture parameter changes in a timely manner and can monitor thermal runaway more effectively.

[0093] Optionally, in some embodiments, in response to the power of the backup battery being lower than the first power threshold, the electrical device using the battery device 100 is powered on and the backup battery is charged.

[0094] Among them, the backup battery is used to supply power to the fire extinguishing system or the anti-theft system after the electrical device (such as an electric vehicle) is powered off, and it can be a lead-acid battery. Powering on the electrical device using the battery device 100 changes its state from a dormant or powered-off state to a powered-on state. Exemplarily, powering on an electric vehicle means the vehicle starts.

[0095] The power level of the backup battery being lower than the first power threshold indicates that there is a risk of power feed for the backup battery, which affects the subsequent wake-up of the first sensor and further affects the alarm for thermal runaway. The first power threshold can be 5%-10% of the fully charged backup battery.

[0096] In this embodiment, in response to the power level of the backup battery being lower than the first power threshold, power is supplied to the electrical device using the battery device 100, and the backup battery is charged, which can reduce the risk of power feed for the vehicle's backup battery.

[0097] Further, in some embodiments, in response to the power level of the battery device 100 being lower than the second power threshold, a reminder message is sent to the user.

[0098] The power level of the battery device 100 being lower than the second power threshold indicates that the power of the battery device 100 is almost exhausted, and there is a risk of power feed for the vehicle. The second power threshold can be 2%-5% of the fully charged battery device 100. At this time, a reminder message is sent to the user. For example, a text message can be sent to the user's mobile phone, or a reminder can be given through the APP on the user's mobile phone to remind the user to charge in time.

[0099] In this way, the risk of power feed for the vehicle can be further reduced, and the reliability of the battery device 100 can be further improved.

[0100] Optionally, in some embodiments, please continue to refer to Figure 1 The thermal runaway management method of the battery device 100 further includes: Step S102: Collect parameters of the battery device 100 through the first sensor; the parameters include at least one of a pressure parameter, a temperature parameter, and a smoke parameter; The sensor collects parameters inside the battery box 10 and outside the battery cells 20; it is usually executed when the electrical device using the battery device 100 is powered on, without worrying about power consumption problems.

[0101] Among them, the pressure parameter refers to the data related to air pressure detected by the pressure sensor; in some embodiments, the pressure parameter is the pressure value or the pressure numerical value of the gas inside the battery box 10. The temperature parameter refers to the data related to temperature detected by the temperature sensor; in some embodiments, the temperature parameter includes temperature; in other embodiments, the temperature parameter includes temperature and the temperature rise slope (temperature rise rate). The smoke parameter refers to the data related to smoke concentration detected by the smoke sensor; in some embodiments, the smoke parameter includes smoke concentration; in other embodiments, the smoke parameter includes smoke concentration and the smoke slope (also known as the "smoke concentration rise slope").

[0102] Step S103: Wake up the BMU in response to at least one of the conditions that the pressure parameter meets the first pressure threshold, the temperature parameter meets the first temperature threshold, and the temperature parameter meets the temperature rise threshold being satisfied.

[0103] That any one of the conditions that the pressure parameter meets the first pressure threshold, the temperature parameter meets the first temperature threshold, and the temperature parameter meets the temperature rise threshold is satisfied indicates that the corresponding parameter is in an abnormal situation. The BMU collects the internal parameters (such as current, voltage, temperature, etc.) of the battery cell 20 through the battery monitoring unit to further determine the thermal runaway level. Among them, the BMU and the battery monitoring unit can be integrated into one structure, or the battery monitoring unit can also be a structure independent of the BMU.

[0104] In this embodiment, the BMU is woken up to further determine the thermal runaway level only when at least one of the conditions that the pressure parameter meets the first pressure threshold, the temperature parameter meets the first temperature threshold, and the temperature parameter meets the temperature rise threshold is satisfied. In this way, the power consumption can be reduced.

[0105] Optionally, in some other embodiments, please also refer to Figure 4 , Figure 4 For the thermal runaway management method of the battery device 100 provided in some other embodiments of the present application, in addition to including step S101, it further includes: Step S104: Collect the parameters of the battery device 100 through the first sensor; Step S105: In response to the parameter meeting the first threshold condition, start the secondary alarm mode; the secondary alarm mode includes giving an alarm prompt and waking up the BMU; If the parameter meets the first threshold condition, it means that the battery device 100 has a thermal runaway and is in the initial stage of thermal runaway. At this stage, a large amount of electrolyte leaks, and the explosion-proof valve of the battery cell 20 opens. At this time, the primary alarm mode includes giving an alarm prompt and waking up the BMU. Among them, the alarm prompt can be an audible and visual alarm to enable users to escape or stay away from the vehicle; it can also send a message to prompt the user; the BMU collects the internal parameters (such as current, voltage, temperature, etc.) of the battery cell 20 through the battery monitoring unit to further determine the thermal runaway level. It can be understood that sensors are also provided inside the battery cell 20 to collect the internal parameters of the battery cell 20, so as to more accurately judge the thermal runaway state of the battery cell 20.

[0106] Step S106: In response to the parameter meeting the second threshold condition, start the tertiary alarm mode; the tertiary alarm mode includes giving an alarm prompt and turning on the manual fire extinguishing mode; the requirement of the second threshold condition is higher than that of the first threshold condition; Among them, when the parameter satisfies the second threshold condition, the battery device 100 undergoes thermal runaway and is in the middle stage of thermal runaway. The battery cell 20 smokes, and the expansion valve of the battery device 100 (pack) opens. The secondary alarm mode includes giving an alarm prompt and activating the manual fire extinguishing mode. In the manual fire extinguishing mode, the user can judge whether to extinguish the fire manually. Manual fire extinguishing includes extinguishing the fire manually through the fire extinguishing button (there may be someone in the vehicle after it is powered off), or remotely controlling the manual fire extinguishing through a terminal such as a mobile phone. It can be understood that if the manual fire extinguishing mode is not activated, the user does not have the permission to extinguish the fire manually. The alarm prompt can be an audible and visual alarm, which prompts the user to turn off the electrical equipment, escape from the scene, and call the fire department.

[0107] Step S107: In response to the parameter satisfying the third threshold condition, activate the fourth-level alarm mode; the fourth-level alarm mode includes giving an alarm prompt and activating the automatic fire extinguishing mode; the requirements of the third threshold condition are higher than those of the second threshold condition.

[0108] Among them, when the parameter satisfies the third threshold condition, the battery device 100 undergoes thermal runaway and is in the late stage of thermal runaway. The battery device 100 catches fire, and the battery cell 20 starts to spray fire, and the battery device 100 is completely out of control. At this time, the third-level alarm mode includes giving an alarm prompt and activating the automatic fire extinguishing mode. Among them, the alarm prompt can include prompting the user to escape as soon as possible, and the automatic fire extinguishing mode can include spraying water, spraying fire extinguishing agents, etc. In the automatic fire extinguishing mode, the electrical equipment directly performs fire extinguishing actions such as spraying water and spraying fire extinguishing agents.

[0109] In this embodiment, for different stages of thermal runaway, different levels of alarms are given, and different fire extinguishing system actions are executed, making the alarm more targeted and timely, thereby improving the reliability of the battery device 100.

[0110] Further, in some embodiments, the parameter includes at least one of a pressure parameter, a temperature parameter, and a smoke parameter; the first threshold condition includes that at least one of the conditions that the pressure parameter satisfies the first pressure threshold, the temperature parameter satisfies the first temperature threshold, and the temperature parameter satisfies the temperature rise threshold is established; the second threshold condition includes that at least two of the conditions that the pressure parameter satisfies the second pressure threshold, the temperature parameter satisfies the second temperature threshold, the temperature parameter satisfies the temperature rise threshold, and the smoke parameter satisfies the smoke threshold are established; the second pressure threshold is higher than the first pressure threshold, and the second temperature threshold is higher than the first temperature threshold; the third threshold condition includes that at least three of the conditions that the pressure parameter satisfies the third pressure threshold, the temperature parameter satisfies the third temperature threshold, the temperature parameter satisfies the temperature rise threshold, and the smoke parameter satisfies the smoke threshold are established, and at least three conditions being established includes that the temperature parameter satisfies the third temperature threshold; the third pressure threshold is higher than the second pressure threshold, and the third temperature threshold is higher than the second temperature threshold.

[0111] Among them, the fourth level of thermal runaway corresponding to the third threshold condition is higher than the third level of thermal runaway corresponding to the second threshold condition, and the third level of thermal runaway corresponding to the second threshold condition is higher than the second level of thermal runaway corresponding to the first threshold condition.

[0112] The first threshold condition is used to determine whether to activate the secondary alarm mode. The second level of thermal runaway corresponding to the first threshold condition is in the initial stage of thermal runaway. A large amount of electrolyte leaks, the explosion-proof valve of the battery cell 20 opens, and the air pressure in the battery box 10 changes. The absolute value of the temperature and the temperature rise slope are relatively intuitive bases for judging thermal runaway. Therefore, when judging whether the battery device 100 is in the second level of thermal runaway, in this application, the pressure parameter is compared with the first pressure threshold, the temperature parameter is compared with the first temperature threshold, and the temperature parameter is compared with the temperature rise threshold. If any one, two, or three conditions are met, it means that the battery device 100 is in the first level of thermal runaway.

[0113] The second threshold condition is used to determine whether to activate the tertiary alarm mode. The third level of thermal runaway corresponding to the second threshold condition is higher than the second level of thermal runaway. This stage is in the middle stage of thermal runaway, and the battery cell 20 smokes, and the expansion valve of the battery device 100 (pack) opens. Among them, more smoke begins to be generated. Therefore, the second threshold condition takes into account the smoke index. The third level takes into account a variety of data indicators, can monitor and give early warnings in a timely manner, and improves the reliability of the battery device 100.

[0114] The third threshold condition is used to determine whether to activate the quaternary alarm mode. The fourth level of thermal runaway corresponding to the third threshold condition is higher than the third level of thermal runaway. This stage is in the late stage of thermal runaway. The battery device 100 catches fire, and the battery cell 20 starts to spray fire, and the battery device 100 is completely out of control. The conditions for the fourth level require at least three conditions to be met and the temperature must reach the danger threshold, reducing the probability of false alarms and improving the reliability of the thermal runaway management of the battery device 100.

[0115] In this embodiment, the judgment conditions for the second level include parameters such as temperature, temperature rise, and pressure, and require at least two conditions to be met, reducing misjudgment caused by a single condition; the judgment conditions for the third level include temperature, temperature rise, pressure, and smoke parameters, and require at least two conditions to be met, which can more comprehensively evaluate risks. The third level takes into account a variety of data indicators, can monitor and give early warnings in a timely manner, and improves the reliability of the battery device 100; the conditions for the fourth level require at least three conditions to be met and the temperature must meet the standard, reducing the probability of false alarms and improving the reliability of the thermal runaway management of the battery device 100.

[0116] Optionally, please also refer to Figure 5 , Figure 5The thermal runaway management method for the battery device 100 provided by some other embodiments of the present application. In addition to including steps S105 to S107, the thermal runaway management method for the battery device 100 further includes: Step S108: In response to the temperature parameter satisfying the second temperature threshold, activate the secondary alarm mode; Step S109: In response to the temperature parameter satisfying the third temperature threshold, activate the tertiary alarm mode; Step S110: In response to the temperature parameter satisfying the fourth temperature threshold, activate the quaternary alarm mode; wherein, the fourth temperature threshold is higher than the third temperature threshold.

[0117] The condition for activating the secondary alarm mode in step S108 is parallel to the condition for activating the secondary alarm mode in step S105. The condition for activating the tertiary alarm mode in step S109 is parallel to the condition for activating the tertiary alarm mode in step S106. The condition for activating the quaternary alarm mode in step S110 is parallel to the condition for activating the quaternary alarm mode in step S107.

[0118] Thus, in this embodiment, for all levels of alarms, a temperature gradient alarm logic of a higher alarm level is set as the backup alarm logic for each level of alarm, preventing that in the worst case, all sensors fail and an alarm can still be made by referring to the temperature threshold.

[0119] Please refer to Figure 6 , Figure 6 , which is a partial circuit diagram of the thermal runaway management system 1000 for the battery device provided by some embodiments of the present application.

[0120] The thermal runaway management system 1000 for the battery device provided by the embodiments of the present application can be applied to electrical equipment. The electrical equipment can be a vehicle.

[0121] Specifically, the thermal runaway management system 1000 for the battery device includes a first sensor 200, a second sensor 300, and a fire extinguishing host 400; both the first sensor 200 and the second sensor 300 are used to collect parameters of the battery device 100; the power consumption of the first sensor 200 is less than that of the second sensor 300; the fire extinguishing host 400 is communicatively connected to the first sensor 200 and the second sensor 300, and is used to execute the thermal runaway management method for the battery device 100 provided by any of the above embodiments.

[0122] Among them, the first sensor 200 and the second sensor 300 can each be one or more, including a pressure sensor, a VOC sensor, a CO sensor, a temperature sensor, a smoke sensor, etc. In some embodiments of the present application, the battery device 100 includes a plurality (e.g., n) of battery boxes 10, and a number of battery cells 20 are arranged in each battery box 10. Each battery box 10 is provided with a corresponding first sensor 200 and / or second sensor 300. The parameters collected by the first sensor 200 and / or the second sensor 300 are the parameters outside the battery cells 20 within the corresponding battery box 10. For example, the first sensor 200 and / or the second sensor 300 corresponding to the No. 1 battery box 10 collect the parameters within the No. 1 battery box 10 and outside the battery cells 20 located within the No. 1 battery box 10; the first sensor 200 and / or the second sensor 300 corresponding to the No. 2 battery box 10 collect the parameters within the No. 2 battery box 10 and outside the battery cells 20 located within the No. 2 battery box 10; and so on. The first sensor 200 and / or the second sensor 300 corresponding to the No. n battery box 10 collect the parameters within the No. n battery box 10 and outside the battery cells 20 located within the No. n battery box 10.

[0123] The fire extinguishing main unit 400 is the core control unit of the fire extinguishing system, which manages and controls the fire extinguishing process. The fire extinguishing main unit 400 is communicatively connected to the first sensor 200 and the second sensor 300, obtains the parameters collected by the first sensor 200 and the second sensor 300, processes and analyzes the parameters to determine whether thermal runaway occurs and the level of thermal runaway, and then issues an instruction.

[0124] Furthermore, in some embodiments, the thermal runaway management system 1000 of the battery device may further include a fire extinguishing device 500, a battery monitoring unit 600, and / or a BMU 700, etc. When the electrical equipment can be a vehicle, the thermal runaway management system 1000 of the battery device may further include an instrument 800 and a switch 900.

[0125] The fire extinguishing device 500 refers to a device that automatically or manually detects a fire and extinguishes it. In some embodiments, the fire extinguishing device 500 includes a fire extinguisher, for example, a foam fire extinguisher, a dry powder fire extinguisher, a fine water mist fire extinguisher, etc. The fire extinguishing main unit 400 issues a signal to the fire extinguishing device 500 through a communication connection to perform a fire extinguishing operation. In some embodiments, each battery box 10 is provided with a corresponding fire extinguishing device 500.

[0126] The battery monitoring unit 600 is a monitor installed on the battery cell 20, responsible for collecting the information of this string of batteries and transmitting it to the BMU 700 for processing. The BMU 700 is a control module for managing and monitoring the performance and state of the battery device 100, responsible for real-time monitoring, management, and protection of the operating state of the battery device 100. The BMU 700 combines the internal parameters (such as current, voltage, temperature, etc.) of the battery cell 20 to further determine the thermal runaway level. Among them, the BMU 700 and the battery monitoring unit 600 can be integrated into one structure, or the battery monitoring unit 600 can also be a structure independent of the BMU 700.

[0127] Please also refer to Figure 7 Some embodiments of the present application provide an electrical device 2000, which includes a battery device 100, a thermal runaway management system 1000 of the battery device, and a backup battery 3000; the thermal runaway management system 1000 of the battery device is the thermal runaway management system 1000 provided in the above embodiments; the backup battery 3000 is used to supply power to the thermal runaway management system 1000 of the battery device when the electrical device 2000 is powered off.

[0128] The electrical device 2000 can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, and a planer, etc. For the convenience of description, the following embodiments take the electrical device 2000 as a vehicle as an example for description.

[0129] The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The battery device 100 is arranged inside the vehicle, and the battery device 100 can be arranged at the bottom, head, or tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle.

[0130] The thermal runaway management system 1000 of the battery device is electrically connected to the battery device 100. The battery device 100 can be a device capable of providing electrical energy to the thermal runaway management system 1000 of the battery device. In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle, but also serve as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. In addition, the electrical device 2000 can be a vehicle. The electrical device 2000 can also include other parts. For example, the other parts can be a vehicle frame, and both the battery device 100 and the thermal runaway management system 1000 of the battery device are installed on the vehicle body.

[0131] In some embodiments, the electrical device 2000 further includes an intelligent meter, a manual fire extinguishing button, and a battery management system (abbreviated as "BMS"), and the BMS can include a battery control unit (abbreviated as "BMU").

[0132] The backup battery 3000 is used to supply power to the fire extinguishing system or the anti-theft system after the electrical device 2000 (such as an electric vehicle) is powered off, and it can be a lead-acid battery. When the electrical device 2000 is powered on, it obtains electrical energy from the main power source (such as the battery device 100 or an external power source) through a charging circuit to maintain its own sufficient power. The backup battery 3000 can enable the thermal runaway management system 1000 of the battery device to still monitor and protect the battery device 100 during the failure of the main power source or the shutdown of the device, reducing the occurrence of thermal runaway accidents in the absence of people.

[0133] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms.

[0134] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0135] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A method for thermal runaway management of a battery device, characterized in that, Including: In response to the power-off completion of the electrical device using the battery device, entering the primary sleep mode; the primary sleep mode includes waking up the first sensor at a first preset frequency without waking up the second sensor; In response to the time of entering the primary sleep mode meeting a first time threshold, entering the deep sleep mode; the deep sleep mode includes waking up the first sensor at a second preset frequency without waking up the second sensor; Wherein, both the first sensor and the second sensor are used to collect parameters of the battery device, and the power consumption of the first sensor is less than that of the second sensor.

2. The method for managing thermal runaway of the battery device according to claim 1, wherein The first sensor includes at least one of a pressure sensor, a temperature sensor, and a smoke sensor; the second sensor includes at least one of a volatile organic compound sensor and a carbon monoxide sensor.

3. The method for managing thermal runaway of the battery device according to claim 1, wherein The first sensor includes a first sub-sensor and a second sub-sensor, and the change rate of the parameter collected by the first sub-sensor is greater than the change rate of the parameter collected by the second sub-sensor; Wherein, waking up the first sensor at the first preset frequency includes: waking up the first sub-sensor at a first preset sub-frequency and waking up the second sub-sensor at a second preset sub-frequency; wherein, the first preset sub-frequency is greater than the second preset sub-frequency.

4. The method for managing thermal runaway of the battery device according to claim 3, wherein The first sub-sensor includes at least one of a pressure sensor and a smoke sensor; the second sub-sensor includes a temperature sensor.

5. The method for managing thermal runaway of the battery device according to claim 3, wherein The first preset sub-frequency is to wake up the first sub-sensor once every 10s - 20s; the second preset sub-frequency is to wake up the second sub-sensor once every 20s - 30s.

6. The method for managing thermal runaway of the battery device according to claim 1, wherein The first preset frequency is to wake up the first sensor once every 10s - 30s; the second preset frequency is to wake up the first sensor once every 40s - 120s.

7. The method for managing thermal runaway of the battery device according to claim 1, wherein The first time threshold is 48 hours - 96 hours.

8. The method for managing thermal runaway of the battery device according to any one of claims 1 - 7, wherein In response to the power of the backup battery being lower than a first power threshold, powering on the electrical device using the battery device and charging the backup battery.

9. The method for managing thermal runaway of the battery device according to claim 8, wherein In response to the power of the battery device being lower than a second power threshold, sending a reminder message to the user.

10. The method for managing thermal runaway of the battery device according to any one of claims 1 - 7, wherein The method for managing thermal runaway of the battery device further includes: Collect parameters of the battery device through the first sensor; the parameters include at least one of a pressure parameter, a temperature parameter, and a smoke parameter; Wake up the battery control unit in response to at least one of the conditions that the pressure parameter satisfies a first pressure threshold, the temperature parameter satisfies a first temperature threshold, and the temperature parameter satisfies a temperature rise threshold being established.

11. The thermal runaway management method of the battery device according to any one of claims 1-7, characterized in that The thermal runaway management method of the battery device further includes: Collect parameters of the battery device through the first sensor; In response to the parameters satisfying a first threshold condition, start a secondary alarm mode; the secondary alarm mode includes giving an alarm prompt and waking up the battery control unit; In response to the parameters satisfying a second threshold condition, start a tertiary alarm mode; the tertiary alarm mode includes giving an alarm prompt and activating a manual fire extinguishing mode; the requirements of the second threshold condition are higher than those of the first threshold condition; In response to the parameters satisfying a third threshold condition, start a quaternary alarm mode; the quaternary alarm mode includes giving an alarm prompt and activating an automatic fire extinguishing mode; the requirements of the third threshold condition are higher than those of the second threshold condition.

12. The thermal runaway management method of the battery device according to claim 11, characterized in that The parameters include at least one of a pressure parameter, a temperature parameter, and a smoke parameter; The first threshold condition includes at least one of the conditions that the pressure parameter satisfies a first pressure threshold, the temperature parameter satisfies a first temperature threshold, and the temperature parameter satisfies a temperature rise threshold being established; The second threshold condition includes at least two of the conditions that the pressure parameter satisfies a second pressure threshold, the temperature parameter satisfies a second temperature threshold, the temperature parameter satisfies the temperature rise threshold, and the smoke parameter satisfies a smoke threshold being established; the second pressure threshold is higher than the first pressure threshold, and the second temperature threshold is higher than the first temperature threshold; The third threshold condition includes at least three of the conditions that the pressure parameter satisfies a third pressure threshold, the temperature parameter satisfies a third temperature threshold, the temperature parameter satisfies the temperature rise threshold, and the smoke parameter satisfies the smoke threshold being established, and the establishment of the at least three conditions includes the temperature parameter satisfying the third temperature threshold; the third pressure threshold is higher than the second pressure threshold, and the third temperature threshold is higher than the second temperature threshold.

13. The thermal runaway management method of the battery device according to claim 12, characterized in that The thermal runaway management method of the battery device further includes: In response to the temperature parameter satisfying the second temperature threshold, start the secondary alarm mode; In response to the temperature parameter satisfying the third temperature threshold, start the tertiary alarm mode; In response to the temperature parameter satisfying a fourth temperature threshold, start the quaternary alarm mode; wherein, the fourth temperature threshold is higher than the third temperature threshold.

14. A thermal runaway management system for a battery device, characterized in that, Includes: The first sensor and the second sensor are both used to collect parameters of the battery device; the power consumption of the first sensor is less than that of the second sensor; The fire extinguishing host is communicatively connected to the first sensor and the second sensor and is used to execute the thermal runaway management method for the battery device according to any one of claims 1-13.

15. An electrical device, characterized in that, Comprising: The battery device is used to provide power for the electrical equipment; The thermal runaway management system of the battery device according to claim 14; The backup battery is used to supply power to the thermal runaway management system of the battery device when the electrical equipment is powered off.

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