A method for extinguishing fires involving batteries, battery packs, and batteries.

Abstract

This application discloses a battery, a battery pack, and a fire extinguishing method for the battery, applicable to the field of battery technology. The battery includes: a battery body, a control component, a monitoring component, a first fire extinguishing component, and a second fire extinguishing component. The battery body includes a top cover with an explosion-proof valve. The first and second fire extinguishing components are respectively disposed on the top cover and close to the explosion-proof valve. The first fire extinguishing component contains a fire extinguishing medium, and the second fire extinguishing component contains a fire blanket. The control component is electrically connected to the first, second, and monitoring components. The monitoring component, disposed on the top cover, monitors the opening status of the explosion-proof valve. The control component, also disposed on the top cover, controls the first fire extinguishing component to spray the fire extinguishing medium towards the explosion-proof valve when the valve is open, and controls the second fire extinguishing component to eject the fire blanket towards the explosion-proof valve so that the fire blanket covers the valve. Thus, by extinguishing the battery fire using two fire extinguishing components, the battery's safety performance is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery, a battery pack, and a method for extinguishing fires involving the battery. Background Technology

[0002] Due to their advantages such as high specific capacity, long cycle life, light weight, and high performance, lithium-ion batteries have expanded from the digital 3C field to transportation power, energy storage, communications, robotics, and other fields, with increasingly widespread applications. However, as the performance requirements for lithium-ion batteries become more stringent, safety factors are becoming more prominent. Typically, under abnormal conditions such as overcharging, over-discharging, or internal short circuits, lithium-ion batteries are prone to thermal runaway, which can further lead to combustion or even explosion, causing personal injury or property damage.

[0003] In related technologies, the battery cell is usually placed inside a casing. To prevent excessive pressure inside the casing, an explosion-proof valve is often installed at the top of the casing for pressure relief. Although the explosion-proof valve can provide some pressure relief, the process from the explosion-proof valve rupture to the battery cell experiencing thermal runaway is very rapid, which can easily lead to combustion and explosion in a short period of time, posing a safety hazard. Summary of the Invention

[0004] This application aims to provide a fire extinguishing method for batteries, battery packs, and batteries, which can solve the problem of short time interval between the explosion of the explosion-proof valve and the onset of thermal runaway in the prior art.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a battery, comprising: a battery body, a control component, a monitoring component, a first fire extinguishing component, and a second fire extinguishing component; the battery body includes a top cover, on which an explosion-proof valve is provided; the first fire extinguishing component and the second fire extinguishing component are respectively disposed on the top cover and close to the explosion-proof valve; the control component is electrically connected to the first fire extinguishing component, the second fire extinguishing component, and the monitoring component; the first fire extinguishing component contains a fire extinguishing medium, and the second fire extinguishing component contains a fire blanket; the monitoring component is disposed on the top cover and is used to monitor the opening state of the explosion-proof valve; the control component is disposed on the top cover and is used to control the first fire extinguishing component to spray the fire extinguishing medium towards the explosion-proof valve when the explosion-proof valve is open, and to control the second fire extinguishing component to eject the fire blanket towards the explosion-proof valve so that the fire blanket covers the explosion-proof valve.

[0007] Optionally, the control component includes a controller; the monitoring component includes a wind speed sensor; the controller is electrically connected to the wind speed sensor, the first fire extinguishing component, and the second fire extinguishing component respectively; the wind speed sensor is located on the periphery of the explosion-proof valve and is used to detect the wind speed at the explosion-proof valve; the controller determines the opening state of the explosion-proof valve based on the wind speed, and when the explosion-proof valve is open, it sequentially controls the operation of the first fire extinguishing component and the second fire extinguishing component.

[0008] Optionally, the first fire extinguishing assembly includes a fire extinguishing chamber and a nozzle; the fire extinguishing chamber is located on the top cover near the explosion-proof valve, the fire extinguishing chamber has a receiving cavity containing the fire extinguishing medium, the nozzle is located on the side of the fire extinguishing chamber away from the top cover and communicates with the receiving cavity, and is electrically connected to the control assembly; the spray direction of the nozzle is towards the explosion-proof valve, and the control assembly is used to control the nozzle to spray the fire extinguishing medium towards the explosion-proof valve.

[0009] Optionally, the fire extinguishing chamber is arranged around the explosion-proof valve, and multiple nozzles are provided; the multiple nozzles are arranged at intervals along the circumference of the explosion-proof valve.

[0010] Optionally, the top cover has a first end face, the explosion-proof valve is embedded in the first end face, and the spray direction of the nozzle is set at an angle D with the first end face, satisfying: 10°≤A≤85°.

[0011] Optionally, the nozzle has a fan-shaped spray nozzle with an opening angle of 20°-160°.

[0012] Optionally, the second fire extinguishing assembly includes an ejection assembly and a base; the base is disposed on the top cover and near the explosion-proof valve, the base includes an ejection section, the ejection assembly and the fire blanket are disposed within the ejection section; a first end of the fire blanket is fixedly connected to the ejection section, a second end of the fire blanket is connected to the ejection assembly, and the ejection assembly is used to eject the free end of the fire blanket from the ejection section so that the fire blanket covers the explosion-proof valve.

[0013] Optionally, the second fire extinguishing assembly further includes an opening member; the opening member is connected to the second end of the fire blanket, and the opening member is used to open the fire blanket and cover the explosion-proof valve after the fire blanket is ejected from the ejector.

[0014] Optionally, the ejection assembly includes a fixed base, a baffle, a driving member, a transmission member, and an elastic member; the fixed base is disposed within the ejection section, and the fixed base has a mounting cavity; the driving member, the transmission member, and the elastic member are all disposed within the mounting cavity; the baffle is disposed at the opening of the mounting cavity; and the opening member is located on the side of the baffle away from the opening of the mounting cavity; the driving member is drively connected to the transmission member, and the transmission member is movably connected to the baffle; one end of the elastic member is connected to the fixed base, and the other end of the elastic member abuts against the baffle; the driving member is used to drive the transmission member to move, thereby causing the baffle to move to release the restriction on the elastic member.

[0015] Optionally, the base further includes a guide portion; the battery has a first direction and a second direction, and the second direction is perpendicular to the first direction; the guide portion is disposed on both sides of the explosion-proof valve along the second direction, one end of the guide portion is connected to the ejection portion, and the other end extends along the first direction in a direction away from the ejection portion; the opening member is a support rod, the support rod is connected to the free end of the fire blanket, so that the fire blanket opens along the second direction; the guide portion is provided with a guide groove, the support rod is slidably connected to the guide groove, and when the ejection assembly ejects the second end of the fire blanket, the opening member slides along the guide groove, so that the fire blanket opens along the first direction and covers the explosion-proof valve.

[0016] Optionally, the extinguishing medium includes one or more of carbon dioxide, carbon tetrachloride, and dry powder.

[0017] Optionally, the fire blanket is made of at least one of glass fiber, carbon fiber, ceramic fiber, and basalt; and / or, the thickness of the fire blanket is less than or equal to 2 mm.

[0018] Optionally, the monitoring component further includes a temperature sensor; the temperature sensor is disposed on the top cover and surrounds the periphery of the explosion-proof valve, the temperature sensor is electrically connected to the controller, and is used to monitor the temperature at the explosion-proof valve and feed the temperature data back to the controller.

[0019] Optionally, the battery body further includes a housing and an electrode core; the housing has a cavity, the electrode core is disposed in the cavity, and the top cover is disposed at the cavity opening.

[0020] Secondly, embodiments of this application propose a battery pack including the battery described in the above embodiments.

[0021] Thirdly, embodiments of this application propose a battery fire extinguishing method, applicable to the battery or battery pack described in the above embodiments.

[0022] Monitor the opening status of the explosion-proof valve;

[0023] When the explosion-proof valve is opened, the first fire extinguishing component is first controlled to spray the fire extinguishing medium into the explosion-proof valve;

[0024] Then, control the second fire extinguishing component to eject the fire blanket towards the explosion-proof valve so that the fire blanket covers the explosion-proof valve.

[0025] In the embodiments of this application, the first fire extinguishing component and the second fire extinguishing component are respectively disposed on the top cover and close to the explosion-proof valve; the control component is electrically connected to the first fire extinguishing component, the second fire extinguishing component and the monitoring component respectively. The monitoring component monitors the opening status of the explosion-proof valve. When the explosion-proof valve is open, the control component controls the first fire extinguishing component to spray the fire extinguishing medium into the explosion-proof valve, and controls the second fire extinguishing component to eject the fire extinguishing blanket into the explosion-proof valve so that the fire extinguishing blanket covers the explosion-proof valve.

[0026] In this way, when the battery's explosion-proof valve ruptures, the first fire extinguishing component sprays extinguishing media onto the valve, quickly isolating the battery assembly from the air. Then, the second fire extinguishing component ejects a fire blanket onto the valve, further isolating it from the outside air and preventing outside air from entering the battery, thus delaying the onset of thermal runaway. In other words, this application, by incorporating a two-stage fire extinguishing structure within the battery, enables fire suppression via extinguishing media and a fire blanket when the explosion-proof valve ruptures, thereby improving battery safety, reducing the risk of battery fire, and extending the user's escape time.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic diagram of a battery according to an embodiment of this application;

[0030] Figure 2 This is a first schematic diagram of a fire extinguishing device according to an embodiment of this application;

[0031] Figure 3 This is a second schematic diagram of a fire extinguishing device according to an embodiment of this application;

[0032] Figure 4 This is a third schematic diagram of a fire extinguishing device according to an embodiment of this application;

[0033] Figure 5 It is along Figure 2Sectional view of line AA in the middle;

[0034] Figure 6 yes Figure 5 A magnified view of a portion of the image;

[0035] Figure 7 It is along Figure 2 Sectional view of the middle BB line;

[0036] Figure 8 This is a schematic diagram of an ejection assembly according to an embodiment of this application;

[0037] Figure 9 This is a side view of the nozzle according to an embodiment of this application;

[0038] Figure 10 This is a top view of the nozzle according to an embodiment of this application;

[0039] Figure 11 This is a flowchart of a fire extinguishing method according to an embodiment of this application.

[0040] Figure label:

[0041] 1-Top cover; 2-Explosion-proof valve; 3-Shell; 4-Control component; 41-Controller; 5-First fire extinguishing component; 51-Fire extinguishing chamber; 52-Nozzle; 6-Second fire extinguishing component; 61-Ejection component; 611-Fixed base; 612-Baffle; 613-Drive component; 614-Transmission component; 615-Elastic component; 616-Groove; 62-Fire blanket; 63-Base; 631-Ejection part; 632-Guide part; 633-Guide groove; 64-Opening component; 7-Monitoring component; 71-Wind speed sensor; 72-Temperature sensor; 8-First end face; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0042] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0043] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0044] In the description of this application, it should be understood that the 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., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] The following description, in conjunction with the accompanying drawings, details the battery, battery pack, and fire extinguishing mechanism provided in this application through specific embodiments and application scenarios.

[0047] Optionally, such as Figures 1 to 10 As shown in the embodiment of this application, a battery is proposed, including: a battery body, a control component 4, a monitoring component 7, a first fire extinguishing component 5, and a second fire extinguishing component 6; the battery body includes a top cover 1, on which an explosion-proof valve 2 is provided; the first fire extinguishing component 5 and the second fire extinguishing component 6 are respectively disposed on the top cover 1 and close to the explosion-proof valve 2; the first fire extinguishing component 5 contains a fire extinguishing medium, and the second fire extinguishing component 6 contains a fire blanket 62; the control component 4 is electrically connected to the first fire extinguishing component 5 and the second fire extinguishing component 6 respectively; the monitoring component 7 is disposed on the top cover 1 and is used to monitor the opening state of the explosion-proof valve 2; the control component 4 is disposed on the top cover 1 and is used to control the first fire extinguishing component 5 to spray the fire extinguishing medium into the explosion-proof valve 2 when the explosion-proof valve 2 is open, and to control the second fire extinguishing component 6 to eject the fire blanket 62 into the explosion-proof valve 2 so that the fire blanket 62 covers the explosion-proof valve 2.

[0048] In the embodiments of this application, the first fire extinguishing component 5 and the second fire extinguishing component 6 are respectively disposed on the top cover 1 and close to the explosion-proof valve 2; the control component 4 is electrically connected to the first fire extinguishing component 5, the second fire extinguishing component 6 and the monitoring component 7 respectively. The monitoring component 7 monitors the opening status of the explosion-proof valve 2. When the explosion-proof valve 2 is detected to be open, the control component 4 controls the first fire extinguishing component 5 to spray the fire extinguishing medium onto the explosion-proof valve 2, and controls the second fire extinguishing component 6 to eject the fire extinguishing blanket 62 onto the explosion-proof valve 2 so that the fire extinguishing blanket 62 covers the explosion-proof valve 2. In this way, when the explosion-proof valve of the battery explodes, the first fire extinguishing component 5 sprays the fire extinguishing medium onto the explosion-proof valve 2 to quickly isolate the battery component from the air; then the second fire extinguishing component 6 ejects the fire extinguishing blanket 62 onto the explosion-proof valve 2, thereby isolating the explosion-proof valve 2 from the outside air again, preventing outside air from entering the battery and delaying the time of thermal runaway of the battery. This application, by setting a two-stage fire extinguishing structure in the battery, can extinguish the fire through the fire extinguishing medium and the fire blanket 62 when the battery's explosion-proof valve bursts, thereby improving the battery's safety performance, reducing the risk of battery fire, and extending the user's escape time.

[0049] In addition, the extinguishing medium can also enter the battery through the explosion-proof valve 2 and then adhere to the electrode core inside the battery, isolating the electrode core from the outside world and delaying the battery's thermal runaway time.

[0050] In addition, the controller 41, the first fire extinguishing component 5 and the second fire extinguishing component 6 of this application are combined to form a fire extinguishing device; the battery pack includes multiple batteries, and each battery is equipped with a fire extinguishing device, thereby improving the scalability and flexibility of the fire extinguishing device.

[0051] It should be noted that, as Figure 1 As shown, the first direction X is the width direction of the battery, the second direction Y is the length direction of the battery, and the third direction Z is the height direction of the battery.

[0052] Specifically, the extinguishing agent can be placed in such a way as... Figure 2 The fire extinguishing chamber 51 shown can also be equipped with a separate storage component, such as a box or airbag, in which the extinguishing medium can be placed; the fire blanket can be placed in such a container. Figure 7 In the ejection part 631 of the base 63 shown, it can also be provided in a compressed spherical shape and provided at the four corners of the base 63.

[0053] In some embodiments, the first fire extinguishing component 5 can be flexibly configured according to actual needs, as long as the spray range of the nozzle 52 of the first fire extinguishing component 5 can cover the explosion-proof valve 2; the second fire extinguishing component 6 can be flexibly configured according to actual needs, as long as the fire blanket 62 ejected by the second fire extinguishing component 6 can cover the explosion-proof valve 2. For example, the first fire extinguishing component 5 is disposed on one side of the explosion-proof valve 2 along the second direction Y, and the second fire extinguishing component 6 is disposed on the other side of the explosion-proof valve 2 along the second direction Y.

[0054] In some embodiments, such as Figure 1 As shown, the monitoring component 7 can be installed on the first fire extinguishing component 5; of course, the monitoring component 7 can be installed on the second fire extinguishing component 6 or on the top cover 1. Furthermore, when the fire extinguishing chamber 51 in the first fire extinguishing component 5 is annular, the monitoring component 7 can be installed along the circumference of the fire extinguishing chamber 51.

[0055] Optionally, such as Figure 2 and Figure 4 As shown, the control component 4 includes a controller 41; the monitoring component 7 includes a wind speed sensor 71; the controller 41 is electrically connected to the wind speed sensor 71, the first fire extinguishing component 5, and the second fire extinguishing component 6 respectively; the wind speed sensor 71 is located on the periphery of the explosion-proof valve 2 and is used to detect the wind speed at the explosion-proof valve 2; the controller 41 is used to determine the opening state of the explosion-proof valve 2 based on the wind speed, and when the explosion-proof valve 2 is open, it sequentially controls the operation of the first fire extinguishing component 5 and the second fire extinguishing component 6.

[0056] In this embodiment, by placing a wind speed sensor 71 around the explosion-proof valve 2 to monitor the wind speed at the valve, the controller 41 determines the opening state of the explosion-proof valve 2 based on the wind speed. When the explosion-proof valve 2 is open, the controller sequentially controls the operation of the first fire extinguishing component 5 and the second fire extinguishing component 6. This control of the first fire extinguishing component 5 and the second fire extinguishing component 6 based on the opening state of the explosion-proof valve 2 improves control accuracy and prevents accidental operation of the first fire extinguishing component 5 and the second fire extinguishing component 6 when the explosion-proof valve 2 is closed.

[0057] Specifically, when the explosion-proof valve of the battery bursts, high-pressure gas is generated inside the battery. The high-pressure gas is discharged through the explosion-proof valve 2. The wind speed sensor 71 can quickly detect the wind speed information at the explosion-proof valve 2 and then transmit the wind speed information to the controller 41. The controller 41 determines whether the explosion-proof valve 2 is open based on the wind speed information, and then controls the operation of the first fire extinguishing component 5 and the second fire extinguishing component 6.

[0058] In some embodiments, the opening status of the explosion-proof valve 2 can also be determined by monitoring information such as pressure changes and temperature changes at the explosion-proof valve 2.

[0059] In some embodiments, the controller 41 includes a receiving module, an output module, a control module, a timing module, and a judgment module. The control module is electrically connected to the receiving module, the output module, the timing module, and the judgment module, respectively. The wind speed sensor 71 is electrically connected to the receiving module, and the output module is electrically connected to the first fire extinguishing component 5 and the second fire extinguishing component 6, respectively. After receiving the wind speed information monitored by the wind speed sensor 71, the receiving module transmits it to the judgment module. The judgment module compares the actual monitored wind speed with a first threshold. If the actual wind speed is greater than the first threshold, it determines that the explosion-proof valve 2 is open, and then transmits the signal to the control module. The control module controls the operation of the first fire extinguishing component 5 through the output module. If the actual wind speed is less than or equal to the first threshold, it determines that the explosion-proof valve 2 is normal, and the control module does not work.

[0060] While the control module controls the operation of the first fire extinguishing component 5, the timing module starts timing. After the timing module reaches the second threshold, the timing module sends a signal to the control module, and the control module controls the operation of the second fire extinguishing component 6 through the output module.

[0061] In some embodiments, the wind speed sensor 71 can be one or more of a hot-wire wind speed sensor, a piezoelectric wind speed sensor, a rotor wind speed sensor, an ultrasonic wind speed sensor, a windmill-type wind speed sensor, etc. The controller can be one or more of a PLC controller, a DCS controller, a SCADA controller, etc.

[0062] In some embodiments, multiple wind speed sensors 71 may be provided, arranged at intervals around the explosion-proof valve 2. This allows for monitoring of wind speed information at the explosion-proof valve 2 using multiple wind speed sensors 71, thereby improving monitoring accuracy.

[0063] Optionally, such as Figure 1 and Figure 2 As shown, the first fire extinguishing component 5 includes a fire extinguishing chamber 51 and a nozzle 52. The fire extinguishing chamber 51 is located on the top cover 1 near the explosion-proof valve 2. The fire extinguishing chamber 51 has a receiving cavity containing fire extinguishing medium. The nozzle 52 is located on the side of the fire extinguishing chamber 51 away from the top cover 1 and communicates with the receiving cavity, and is electrically connected to the control component 4. The spray direction of the nozzle 52 is towards the explosion-proof valve 2. The control component 4 is used to control the nozzle 52 to spray the fire extinguishing medium towards the explosion-proof valve 2.

[0064] In this embodiment, the fire extinguishing chamber 51 is positioned on the top cover 1 near the explosion-proof valve 2. The fire extinguishing chamber 51 has a receiving cavity containing fire extinguishing medium. The nozzle 52 is located on the side of the fire extinguishing chamber 51 away from the top cover 1 and communicates with the receiving cavity, and is electrically connected to the control component 4. The spray direction of the nozzle 52 is towards the explosion-proof valve 2, and the control component 4 controls the nozzle 52 to spray the fire extinguishing medium towards the explosion-proof valve 2. In this way, the receiving cavity provides space for the fire extinguishing medium, and the nozzle 52 can continuously spray the fire extinguishing medium from the receiving cavity towards the explosion-proof valve 2, which helps to improve the stability of fire extinguishing.

[0065] Optionally, such as Figure 1 and Figure 2 As shown, the fire extinguishing chamber 51 is arranged around the explosion-proof valve 2, and multiple nozzles 52 are provided; the multiple nozzles 52 are arranged at intervals along the circumference of the explosion-proof valve 2.

[0066] In this embodiment, the fire extinguishing chamber 51 is arranged around the explosion-proof valve 2, and multiple nozzles 52 are provided; the multiple nozzles 52 are arranged at intervals along the circumference of the explosion-proof valve 2. In this way, the fire extinguishing medium can be sprayed onto the explosion-proof valve 2 through multiple nozzles 52, thereby improving the fire extinguishing efficiency.

[0067] For example, four nozzles 52 are provided, and the four nozzles 52 are respectively provided on both sides of the fire extinguishing chamber 51 along the first direction X and on both sides along the second direction Y, thereby improving the uniformity of the fire extinguishing medium spray and the coverage area of ​​the fire extinguishing medium.

[0068] In some embodiments, the fire extinguishing chamber 51 can be configured as annular, arc-shaped, rectangular, etc., and this application embodiment does not impose any limitations.

[0069] Optionally, such as Figure 2 and Figure 9 As shown, the top cover 1 has a first end face 8, the explosion-proof valve 2 is embedded in the first end face, and the spray direction of the nozzle 52 is set at an angle D with the first end face 8, satisfying: 10°≤D≤85°.

[0070] In this embodiment, the explosion-proof valve 2 is embedded in the first end face 8, and the spray direction of the nozzle 52 is set at an angle D with the first end face 8. This allows the nozzle 52 to spray towards the explosion-proof valve 2, thereby spraying the extinguishing medium onto the surface of the electrode core through the explosion-proof valve 2.

[0071] In some embodiments, the nozzle 52 includes a nozzle body, a nozzle, and a high-pressure pump. The nozzle body has a first channel connecting the nozzle and the fire extinguishing chamber 51. The high-pressure pump is located in the nozzle body and electrically connected to the controller 41. When the controller 41 issues a fire extinguishing command to the nozzle 52, the high-pressure pump starts, and the fire extinguishing medium is pumped into the first channel. Due to the extremely small size of the first channel, the fire extinguishing medium is subjected to immense pressure. This high pressure forces the fire extinguishing medium to pass through the first channel at high speed and exit from the nozzle. At the instant the fire extinguishing medium exits the nozzle, due to the surface tension of the fire extinguishing medium and the frictional force generated by its high-speed flow, it is torn into tiny droplets or dust, forming a spray, which is then sprayed onto the surface of the electrode core through the explosion-proof valve 2.

[0072] In some embodiments, such as Figure 1 and Figure 9 As shown, the third direction Z represents the height of the battery, and the first end face is the plane containing the upper surface of the top cover 1. The plane containing the upper surface of the top cover 1 is perpendicular to the third direction Z. The spray direction of the nozzle 52 refers to the direction in which the extinguishing medium is sprayed.

[0073] For example, the angle D between the spray direction of the nozzle 52 and the first end face can be set to any value or a range between any two values, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 85°.

[0074] In some embodiments, the nozzle 52 may be configured as one or more of the following: a conical nozzle, a fan-shaped nozzle, a multi-hole nozzle, a fan-shaped rotating nozzle, a pulse nozzle, an atomizing nozzle, etc.

[0075] Optionally, such as Figure 10 As shown, the nozzle 52 has a fan-shaped spray nozzle with an opening angle of 20°-160°.

[0076] In this embodiment, a fan-shaped spray nozzle is provided, with an opening angle E of 20°-160°. This increases the spray range of the nozzle, which can cover the explosion-proof valve 2, thereby improving the safety of fire extinguishing.

[0077] For example, the opening angle E of the jet nozzle can be set to any value or a range between any two values, such as 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°.

[0078] Optionally, such as Figures 2 to 7As shown, the second fire extinguishing assembly 6 includes an ejection assembly 61, a fire blanket 62, and a base 63. The base 63 is located on the top cover 1 and close to the explosion-proof valve 2. The base 63 includes an ejection part 631, and the ejection assembly 61 and the fire blanket 62 are located inside the ejection part 631. The first end of the fire blanket 62 is fixedly connected to the ejection part 631, and the second end of the fire blanket 62 is connected to the ejection assembly 61. The ejection assembly 61 is used to eject the second end of the fire blanket 62 from the ejection part 631 so that the fire blanket 62 covers the explosion-proof valve 2.

[0079] In this embodiment, by placing the base 63 on the top cover 1 and near the explosion-proof valve 2, and placing the ejection assembly 61 and the fire blanket 62 inside the ejection section 631 of the base 63, the first end of the fire blanket 62 is fixedly connected to the ejection section 631, and the second end of the fire blanket 62 is connected to the ejection assembly 61. The ejection assembly 61 ejects the second end of the fire blanket 62 from the ejection section 631 so that the fire blanket 62 covers the explosion-proof valve 2. In this way, by placing the ejection assembly 61 and the fire blanket 62 inside the ejection section 631 of the base 63, and then ejecting the fire blanket 62 to cover the explosion-proof valve 2 by the ejection assembly 61, the space occupied by the ejection assembly 61 and the fire blanket 62 can be reduced.

[0080] In some embodiments, such as Figures 3 to 6 As shown, the ejection unit 631 has a cavity, and the orientation of the cavity opening is the same as the ejection direction of the ejection assembly 61. The ejection assembly 61 is located at the bottom of the cavity, and the ejection assembly 61 is electrically connected to the controller 41. The output end of the ejection assembly 61 is connected to the fire blanket 62, thereby ejecting the fire blanket 62.

[0081] In some embodiments, the ejection assembly 61 can be configured as a combination of a locking member and a spring; the locking member is electrically connected to the controller 41, and the spring is initially in a compressed state, at which time the locking member locks the spring in the compressed state; the spring is connected to the fire blanket 62; when the explosion-proof valve 2 is open, the controller 41 controls the locking member to unlock, so that the spring changes from a compressed state to an extended state, thereby generating elastic force that is transmitted to the fire blanket 62, causing the fire blanket 62 to be ejected in a direction away from the ejection part 631.

[0082] In some embodiments, the fire blanket 62 is compressed into a spherical object. The fire blanket 62 is made of a material with elastic deformation. The spring launches the spherical fire blanket 62 in a parabolic trajectory. The fire blanket 62 opens under the action of elasticity, thereby covering the explosion-proof valve 2.

[0083] Optionally, such as Figures 3 to 7 As shown, the second fire extinguishing component 6 also includes an opening member 64; the opening member 64 is connected to the second end of the fire blanket 62, and the opening member 64 is used to open the fire blanket 62 and cover the explosion-proof valve 2 after the fire blanket 62 is ejected from the ejection part 631.

[0084] In this embodiment, by connecting the opening member 64 to the second end of the fire blanket 62, the opening member 64 causes the fire blanket 62 to open and cover the explosion-proof valve 2 after it is ejected from the ejection part 631. This allows the fire blanket 62 to open to the maximum extent, thereby increasing the area of ​​the fire blanket 62 covering the explosion-proof valve 2.

[0085] Specifically, such as Figure 3 and Figure 6 As shown, the fire blanket 62 is compressed in the first direction X and normally opened in the second direction Y. The opening member 64 is connected to the second end of the fire blanket 62. Under the action of the elastic member 615, the opening member 64 moves along the first direction X; during the movement of the opening member 64, the opening member 64 drives the fire blanket 62 to open along the first direction X, thereby covering the explosion-proof valve 2.

[0086] In some embodiments, the opening element 64 may be one or more of the following: ceramic rod, glass rod, etc., which are insulating and resistant to high temperatures.

[0087] Optionally, such as Figure 8 As shown, the ejection assembly 61 includes a fixed base 611, a baffle 612, a driving member 613, a transmission member 614, and an elastic member 615. The fixed base 611 is disposed within the ejection part 631 and has a mounting cavity. The driving member 613, the transmission member 614, and the elastic member 615 are all disposed in the mounting cavity. The baffle 612 is disposed at the opening of the mounting cavity, and the opening member 64 is located on the side of the baffle 612 away from the opening of the mounting cavity. The driving member 613 is connected to the transmission member 614, and the transmission member 614 is movably connected to the baffle 612. One end of the elastic member 615 is connected to the fixed base 611, and the other end of the elastic member 615 abuts against the baffle 612. The driving member 613 is used to drive the transmission member 614 to move, thereby driving the baffle 612 to move to release the restriction on the elastic member 615.

[0088] In this embodiment, the fixed base 611 is disposed within the ejection section 631, and the driving member 613, transmission member 614, and elastic member 615 are all disposed within the mounting cavity of the fixed base 611. A baffle 612 is disposed at the opening of the mounting cavity, and the opening member 64 is located on the side of the baffle 612 facing away from the opening of the mounting cavity. The driving member 613 is drive-connected to the transmission member 614, and the transmission member 614 is movably connected to the baffle 612. One end of the elastic member 615 is connected to the fixed base 611, and the other end of the elastic member 615 abuts against the baffle 612. The driving member 613 drives the transmission member 614 to move, thereby causing the baffle 612 to move and release the restriction on the elastic member 615. Thus, after the restriction on the elastic member 615 is released, the elastic member 615 impacts the opening member 64, which is connected to the fire blanket 62, thereby causing the fire blanket 62 to open.

[0089] Specifically, the working principle of the ejection assembly 61 includes: the elastic element 615 is initially in a compressed state, and the controller 41 is electrically connected to the drive element 613; when the controller 41 issues a secondary fire extinguishing command, the controller 41 controls the drive element 613 to start operating, which drives the baffle 612 to move away through the transmission element 614 (e.g., Figure 8 (It can move to the left or right as shown), then the elastic member 615 is released and impacts the opening member 64 connected to the fire blanket 62, thereby causing the fire blanket 62 to move and open, thereby covering the explosion-proof valve 2.

[0090] In some embodiments, the driving member 613 may be a drive motor or a cylinder, and the transmission member 614 may be a gear rack or a lead screw slider; when the transmission member 614 is a gear, a tooth groove 616 may be provided on the baffle 612, and the gear meshes with the tooth groove 616.

[0091] Optionally, such as Figures 3 to 7 As shown, the base 63 also includes a guide portion 632; the battery has a first direction X and a second direction Y, and the second direction Y is perpendicular to the first direction X; the guide portion 632 is provided on both sides of the explosion-proof valve 2 along the second direction Y, one end of the guide portion 632 is connected to the ejection portion 631, and the other end extends along the first direction X in a direction away from the ejection portion 631; the opening member 64 is a support rod, which is connected to the free end of the fire blanket 62 so that the fire blanket 62 opens along the second direction Y; the guide portion 632 is provided with a guide groove 633, and the support rod is slidably connected to the guide groove 633. When the ejection assembly 61 ejects the second end of the fire blanket 62, the opening member 64 slides along the guide groove 633, and then the fire blanket 62 opens along the first direction X and covers the explosion-proof valve 2.

[0092] In this embodiment, the guide portion 632 is disposed on both sides of the explosion-proof valve 2 along the second direction Y. One end of the guide portion 632 is connected to the ejection portion 631, and the other end extends along the first direction X in a direction away from the ejection portion 631. The opening member 64 is a support rod connected to the second end of the fire blanket 62. The guide portion 632 is provided with a guide groove 633, and the support rod is slidably connected to the guide groove 633. In this way, when the ejection assembly 61 ejects the free end of the fire blanket 62, the opening member 64 can slide along the guide groove 633, thereby improving the accuracy of the guide member sliding, and thus allowing the fire blanket 62 to open along the first direction X and cover the explosion-proof valve 2.

[0093] In some embodiments, the fire blanket 62 is compressed in the first direction X, one end of the fire blanket 62 in the first direction X is fixedly connected to the ejection part 631, and the other end of the fire blanket 62 in the first direction X is fixedly connected to the support rod; the output end of the ejection assembly 61 is movably connected to the support rod. Thus, after the ejection assembly 61 applies a spring force to the support rod, the support rod slides along the guide groove 633, thereby causing the fire blanket 62 to open in the first direction X and cover the explosion-proof valve 2.

[0094] In some embodiments, sliders are connected to both ends of the support rod along the second direction Y, and a slide rail is provided in the guide groove 633, with the sliders and the slide rail slidably connected. This reduces the friction on the support rod during movement, improving the stability of the fire blanket 62 when it opens.

[0095] Optionally, the extinguishing medium includes one or more of carbon dioxide, carbon tetrachloride, and dry powder.

[0096] In this embodiment, the extinguishing medium is composed of one or more of carbon dioxide, carbon tetrachloride, and dry powder. This allows the non-flammability and non-toxicity of carbon dioxide, carbon tetrachloride, and dry powder to quickly prevent the spread of fire in the electrode core.

[0097] Optionally, the fire blanket 62 is made of at least one of glass fiber, carbon fiber, ceramic fiber, and basalt.

[0098] In this embodiment, the device is made of at least one of glass fiber, carbon fiber, ceramic fiber, and basalt. This utilizes the high-temperature resistance of glass fiber, carbon fiber, ceramic fiber, and basalt to isolate the explosion-proof valve 2 from the outside air, thus delaying the time it takes for the battery to thermally runaway.

[0099] Optionally, the thickness of the fire blanket 62 is less than or equal to 2 mm.

[0100] In this embodiment, the thickness of the fire blanket 62 is set to be less than or equal to 2 mm. This avoids the fire blanket 62 being too thick and occupying too much space, which would be detrimental to its placement.

[0101] For example, the thickness of the fire blanket 62 can be set to any value or a range between any two values, such as 0.1mm, 0.4mm, 0.8mm, 1.2mm, 1.6mm, 2mm.

[0102] In some embodiments, the opening area of ​​the fire blanket 62 is greater than or equal to the area of ​​the explosion-proof valve 2. It should be noted that the opening area of ​​the fire blanket 62 is the area covered by the fire blanket 62; the area of ​​the explosion-proof valve 2 is the projected area of ​​the explosion-proof valve 2 on its first end face.

[0103] Optionally, such as Figure 1 and Figure 2 As shown, the monitoring component 7 also includes a temperature sensor 72; the temperature sensor 72 is located on the top cover 1 and surrounds the periphery of the explosion-proof valve 2. The temperature sensor 72 is electrically connected to the controller 41 and is used to monitor the temperature at the explosion-proof valve 2 and feed the temperature data back to the controller 41.

[0104] In this embodiment, a temperature sensor 72 is disposed on the top cover 1 and surrounds the explosion-proof valve 2. The temperature sensor 72 is electrically connected to the controller 41 to monitor the temperature at the explosion-proof valve 2 and feed the temperature data back to the controller 41. Thus, when the battery experiences thermal runaway, the temperature sensor 72 will also monitor the temperature change at the explosion-proof valve 2, thereby monitoring and collecting temperature change data throughout the entire period of battery thermal runaway.

[0105] In addition, the temperature sensor 72 can be electrically connected to the receiving module in the controller 41. Based on the actual wind speed being greater than the first threshold, the module receives temperature data from the temperature sensor 72. If the actual temperature is greater than the third threshold, it determines that the explosion-proof valve 2 is open and then transmits the signal to the control module. The control module then controls the operation of the first fire extinguishing component 5 through the output module. This two-step process of determining wind speed and temperature reduces the possibility of misjudgment by the controller 41 and improves the accuracy of the judgment. If the actual temperature is less than or equal to the third threshold, it determines that the explosion-proof valve 2 is normal, and the control module does not operate.

[0106] In some embodiments, the temperature sensor 72 may include one or more of the following: a thermistor, a non-contact temperature sensor, a digital temperature sensor, an infrared temperature sensor, a laser temperature sensor, a platinum coupler temperature sensor, an ultrasonic temperature sensor, etc.

[0107] In some embodiments, multiple temperature sensors 72 may be provided, arranged at intervals around the explosion-proof valve 2. This improves the accuracy of monitoring by using multiple temperature sensors 72 to monitor the temperature information at the explosion-proof valve 2.

[0108] Optionally, such as Figure 1 As shown, the battery body also includes a housing 3 and an electrode core; the housing 3 has a cavity, the electrode core is disposed in the cavity, and the top cover 1 is disposed at the cavity opening.

[0109] In this embodiment, the electrode core is disposed within the cavity, and the top cover 1 is placed over the cavity opening. This allows the extinguishing medium of the first fire extinguishing component 5 to enter the cavity through the explosion-proof valve 2 and then adhere to the surface of the electrode core.

[0110] Optionally, embodiments of this application propose a battery pack including the battery as described in the above embodiments.

[0111] In the embodiments of this application, the first fire extinguishing component 5 and the second fire extinguishing component 6 are respectively disposed on the top cover 1 and close to the explosion-proof valve 2; the control component 4 is electrically connected to the first fire extinguishing component 5, the second fire extinguishing component 6 and the monitoring component 7 respectively. The monitoring component 7 monitors the opening status of the explosion-proof valve 2. When the explosion-proof valve 2 is detected to be open, the control component 4 controls the first fire extinguishing component 5 to spray the fire extinguishing medium onto the explosion-proof valve 2, and controls the second fire extinguishing component 6 to eject the fire extinguishing blanket 62 onto the explosion-proof valve 2 so that the fire extinguishing blanket 62 covers the explosion-proof valve 2. In this way, when the explosion-proof valve of the battery explodes, the first fire extinguishing component 5 sprays the fire extinguishing medium onto the explosion-proof valve 2 to quickly isolate the battery component from the air; then the second fire extinguishing component 6 ejects the fire extinguishing blanket 62 onto the explosion-proof valve 2, thereby isolating the explosion-proof valve 2 from the outside air again, preventing outside air from entering the battery and delaying the time of thermal runaway of the battery. This application, by setting a two-stage fire extinguishing structure in the battery, can extinguish the fire through the fire extinguishing medium and the fire blanket 62 when the battery experiences thermal runaway, thereby improving the safety performance of the battery, reducing the risk of battery fire, and extending the user's escape time.

[0112] Optionally, such as Figure 11 As shown in the figure, this application proposes a battery fire extinguishing method, which is applied to the battery or battery pack in the above embodiments. The specific steps of the fire extinguishing method are as follows:

[0113] Step 101: Monitor the opening status of explosion-proof valve 2;

[0114] Specifically, the wind speed information at the explosion-proof valve 2 can be monitored by a wind speed sensor, and the pressure information at the explosion-proof valve 2 can be monitored by a pressure sensor; when the wind speed information and the pressure information reach the preset wind speed threshold and the preset pressure threshold respectively, the controller 41 determines that the explosion-proof valve 2 is in the open state.

[0115] Step 102: When the explosion-proof valve 2 is open, first control the first fire extinguishing component 5 to spray the fire extinguishing medium into the explosion-proof valve 2;

[0116] Specifically, when the explosion-proof valve 2 is in the open state, the controller 41 first controls the nozzle 52 to open, spraying the extinguishing medium stored in the fire extinguishing chamber 51 into the explosion-proof valve 2.

[0117] Step 103: Control the second fire extinguishing component 6 to eject the fire blanket 62 to the explosion-proof valve 2 so that the fire blanket 62 covers the explosion-proof valve 2.

[0118] Specifically, the controller 41 sends an activation command to the ejection assembly 61, controlling the ejection assembly 61 to eject the fire blanket 62 so that the fire blanket 62 covers the explosion-proof valve 2.

[0119] In some embodiments, the controller 41 includes a timing module that, when the controller 41 controls the nozzle 52 to open...

[0120] The timing module starts timing. After the timing module reaches the preset duration, the controller 41 sends an activation command to the ejection assembly 61 to control the ejection assembly 61 to run.

[0121] In the event of a battery explosion-proof valve 2 rupture, this application first sprays extinguishing media onto the explosion-proof valve 2 via the first fire extinguishing component 5, rapidly isolating the battery assembly from the air. Then, the second fire extinguishing component 6 ejects a fire blanket 62 onto the explosion-proof valve 2, further isolating it from the outside air and preventing it from entering the battery. This provides oxygen to the battery core and delays the onset of thermal runaway. In other words, by incorporating a two-stage fire extinguishing structure within the battery, this application enables fire suppression via extinguishing media and a fire blanket 62 when the explosion-proof valve 2 ruptures, thereby improving battery safety, reducing the risk of fire, and extending the user's escape time.

[0122] In addition, the extinguishing medium can also enter the battery through the explosion-proof valve 2 and then adhere to the electrode core inside the battery, isolating the electrode core from the outside world and delaying the battery's thermal runaway time.

[0123] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0124] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, characterized by, The application relates to a battery safety device. The battery safety device comprises a battery body, a control assembly (4), a monitoring assembly (7), a first fire extinguishing assembly (5) and a second fire extinguishing assembly (6). The battery body comprises a top cover (1) provided with an explosion-proof valve (2), and the first fire extinguishing assembly (5) and the second fire extinguishing assembly (6) are arranged on the top cover (1) and close to the explosion-proof valve (2); the control assembly (4) is electrically connected with the first fire extinguishing assembly (5), the second fire extinguishing assembly (6) and the monitoring assembly (7) respectively; The first fire extinguishing assembly (5) is provided with fire extinguishing medium, and the second fire extinguishing assembly (6) is provided with a fire blanket (62); The monitoring assembly (7) is arranged on the top cover (1) and used for monitoring the opening state of the explosion-proof valve (2); The control assembly (4) is arranged on the top cover (1) and used for controlling the first fire extinguishing assembly (5) to spray the fire extinguishing medium to the explosion-proof valve (2) and controlling the second fire extinguishing assembly (6) to eject the fire blanket (62) to the explosion-proof valve (2) so that the fire blanket (62) covers the explosion-proof valve (2) when the explosion-proof valve (2) is opened; The second fire extinguishing assembly (6) comprises an ejecting assembly (61), a base (63) and an opening piece (64); the base (63) is arranged on the top cover (1) and close to the explosion-proof valve (2), the base (63) comprises an ejecting part (631), the ejecting assembly (61) and the fire blanket (62) are arranged in the ejecting part (631); a first end of the fire blanket (62) is fixedly connected with the ejecting part (631); a second end of the fire blanket (62) is connected with the ejecting assembly (61); the opening piece (64) is connected with the second end of the fire blanket (62); The ejecting assembly (61) comprises a fixing seat (611), a baffle (612), a driving piece (613), a transmission piece (614) and an elastic piece (615); the fixing seat (611) is arranged in the ejecting part (631) and has an installation cavity, the driving piece (613), the transmission piece (614) and the elastic piece (615) are arranged in the installation cavity, the baffle (612) is arranged at the cavity opening of the installation cavity, and the opening piece (64) is located on the side, away from the cavity opening of the installation cavity, of the baffle (612); The driving piece (613) is in transmission connection with the transmission piece (614), the transmission piece (614) is in movable connection with the baffle (612), one end of the elastic piece (615) is connected with the fixing seat (611), and the other end of the elastic piece (615) is in abutment with the baffle (612); the driving piece (613) is used for driving the transmission piece (614) to move, and then drives the baffle (612) to move so as to release the restriction on the elastic piece (615).

2. The battery of claim 1, wherein, The control assembly (4) comprises a controller (41); and the monitoring assembly (7) comprises a wind speed sensor (71). The controller (41) is electrically connected with the wind speed sensor (71), the first fire extinguishing assembly (5) and the second fire extinguishing assembly (6) respectively; the wind speed sensor (71) is arranged on the side of the explosion-proof valve (2) and used for detecting the wind speed at the explosion-proof valve (2); the controller (41) determines the opening state of the explosion-proof valve (2) based on the wind speed, and controls the first fire extinguishing assembly (5) and the second fire extinguishing assembly (6) to operate in turn when the explosion-proof valve (2) is opened.

3. The battery of claim 1, wherein, The first fire extinguishing assembly (5) comprises a fire extinguishing bin (51) and a spray head (52). The fire extinguishing bin (51) is arranged on the top cover (1) near the explosion-proof valve (2), has a containing cavity, and is provided with the fire extinguishing medium in the containing cavity; the spray head (52) is arranged on the side of the fire extinguishing bin (51) away from the top cover (1) and is in communication with the containing cavity, and is electrically connected with the control assembly (4); the spray direction of the spray head (52) is towards the explosion-proof valve (2), and the control assembly (4) is used for controlling the spray head (52) to spray the fire extinguishing medium towards the explosion-proof valve (2).

4. The battery of claim 3, wherein, The fire extinguishing bin (51) surrounds the explosion-proof valve (2), and the spray head (52) is provided with a plurality of spray heads.

5. The battery of claim 3, wherein, The top cover (1) has a first end face, the explosion-proof valve (2) is embedded in the first end face (8), the spray direction of the spray head (52) and the first end face (8) are arranged at an angle D, and the angle D satisfies 10°≤D≤85°.

6. The battery of claim 5, wherein, The spray head (52) has a fan-shaped spray port, and the opening angle of the spray port is 20°-160°.

7. The battery of any one of claims 1-6, wherein: The ejection assembly (61) is used for ejecting the second end of the fire blanket (62) from the ejection part (631) so that the fire blanket (62) covers the explosion-proof valve (2).

8. The battery of claim 1, wherein, The opening member (64) is used for opening the fire blanket (62) and covering the explosion-proof valve (2) after the fire blanket (62) is ejected from the ejection part (631).

9. The battery of claim 8, wherein, The base (63) further comprises a guide part (632); The battery has a first direction (X) and a second direction (Y), and the second direction (Y) is perpendicular to the first direction (X); The ejection assembly (61) ejects along the first direction (X), the guide part (632) is arranged on both sides of the explosion-proof valve (2) along the second direction (Y), one end of the guide part (632) is connected with the ejection part (631), and the other end extends along the first direction (X) in a direction away from the ejection part (631). The opening member (64) is a support rod connected to the second end of the fire blanket (62) to open the fire blanket (62) in the second direction (Y); the guide part (632) is provided with a guide groove (633), and the support rod is slidingly connected to the guide groove (633); in the case that the ejection assembly (61) ejects the second end of the fire blanket (62), the opening member (64) slides along the guide groove (633), and the fire blanket (62) is opened in the first direction (X) and covers the explosion-proof valve (2).

10. The battery of claim 1, wherein, The fire extinguishing medium includes one or more than two combinations of carbon dioxide, carbon tetrachloride, and dry powder.

11. The battery of claim 1, wherein, The fire blanket (62) is made of at least one of glass fiber, carbon fiber, ceramic fiber, and basalt. And / or, the thickness of the fire blanket (62) is less than or equal to 2 mm.

12. The battery of claim 2, wherein, The monitoring assembly (7) further includes a temperature sensor (72); the temperature sensor (72) is arranged on the top cover (1) and surrounds the side of the explosion-proof valve (2), and the temperature sensor (72) is electrically connected with the controller (41) and is used for monitoring the temperature of the explosion-proof valve (2) and feeding back temperature data to the controller (41).

13. The battery of claim 1, wherein, The battery body further includes a shell (3) and a pole core, The shell (3) has a cavity, the pole core is arranged in the cavity, and the top cover (1) is arranged at the cavity opening of the cavity.

14. A battery pack, characterized by The battery includes the battery as claimed in any one of claims 1-13.

15. A fire extinguishing method of a battery, applied to the battery as claimed in any one of claims 1-13 or the battery pack as claimed in claim 14, and characterized in that, The opening state of the explosion-proof valve (2) is monitored; When the explosion-proof valve (2) is opened, the first fire extinguishing assembly (5) is controlled to spray fire extinguishing medium to the explosion-proof valve (2); Then, the second fire extinguishing assembly (6) is controlled to eject the fire blanket (62) to the explosion-proof valve (2) to cover the explosion-proof valve (2) with the fire blanket (62).

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