Battery, battery pack and fire extinguishing method of battery

Abstract

The invention discloses a battery, a battery pack and a fire extinguishing method of the battery, and is applied to the technical field of batteries. The battery comprises a battery body, a control assembly, a monitoring assembly, a first fire extinguishing assembly and a second fire extinguishing assembly, the battery body comprises a top cover, an anti-explosion valve is arranged on the top cover, and the first fire extinguishing assembly and the second fire extinguishing assembly are respectively arranged on the top cover and are close to the anti-explosion valve; a fire extinguishing medium is arranged in the first fire extinguishing assembly, and a fire extinguishing blanket is arranged in the second fire extinguishing assembly. The control assembly is electrically connected with the first fire extinguishing assembly, the second fire extinguishing assembly and the monitoring assembly. The monitoring assembly is arranged on the top cover and used for monitoring the opening state of the anti-explosion valve, and the control assembly is arranged on the top cover and used for controlling the first fire extinguishing assembly to spray a fire extinguishing medium to the anti-explosion valve and controlling the second fire extinguishing assembly to eject a fire extinguishing blanket to the anti-explosion valve to enable the fire extinguishing blanket to cover the anti-explosion valve under the condition that the anti-explosion valve is opened. In this way, the battery is extinguished through the two fire extinguishing assemblies, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery, a battery pack and a battery fire extinguishing method. Background Art

[0002] Due to the advantages of lithium-ion batteries such as large specific capacity, long cycle life, light weight and high performance, they have been extended from the digital 3C field to transportation power, energy storage, communications, robotics and other fields, and their applications are becoming more and more extensive. However, as the performance requirements for lithium-ion batteries become higher and higher, safety factors are becoming more and more prominent. Usually, lithium-ion batteries are prone to thermal runaway under abnormal conditions such as overcharge, over-discharge, internal short circuit, etc., which further cause combustion or even explosion, resulting in casualties or property losses.

[0003] In the related art, the battery cell is usually placed in a shell. In order to avoid excessive pressure in the shell, an explosion-proof valve for pressure relief is often set on the top of the shell. Although the explosion-proof valve can relieve pressure to a certain extent, the process from the explosion of the explosion-proof valve to the thermal runaway of the battery cell is very rapid, which makes it easy to burn and explode in a short time, posing a safety hazard. Summary of the invention

[0004] The present application aims to provide a battery, a battery pack and a battery fire extinguishing method, which can solve the problem in the prior art that the time interval from the explosion of the explosion-proof valve to the start of thermal runaway of the battery is short.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application proposes 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 comprises a top cover, the top cover is provided with an explosion-proof valve, the first fire extinguishing component and the second fire extinguishing component are respectively arranged 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 first fire extinguishing component is provided with a fire extinguishing medium, and the second fire extinguishing component is provided with a fire extinguishing blanket; the monitoring component is arranged on the top cover, for monitoring the opening state of the explosion-proof valve; the control component is arranged on the top cover, for controlling the first fire extinguishing component to spray the fire extinguishing medium toward the explosion-proof valve when the explosion-proof valve is opened, and controlling the second fire extinguishing component to eject the fire extinguishing blanket toward the explosion-proof valve so that the fire extinguishing 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 arranged on the peripheral side 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 opened, controls the operation of the first fire extinguishing component and the second fire extinguishing component in sequence.

[0008] Optionally, the first fire extinguishing component includes a fire extinguishing chamber and a nozzle; the fire extinguishing chamber is arranged on the top cover near the explosion-proof valve, the fire extinguishing chamber has a accommodating chamber, the fire extinguishing medium is arranged in the accommodating chamber, the nozzle is arranged on the side of the fire extinguishing chamber away from the top cover, communicates with the accommodating chamber, and is electrically connected to the control component; the spraying direction of the nozzle is toward the explosion-proof valve, and the control component is used to control the nozzle to spray the fire extinguishing medium toward the explosion-proof valve.

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

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

[0011] Optionally, the nozzle has a fan-shaped injection port, and the opening angle of the injection port is 20°-160°.

[0012] Optionally, the second fire extinguishing assembly includes an ejection assembly and a base; the base is arranged on the top cover and close to the explosion-proof valve, the base includes an ejection part, the ejection assembly and the fire blanket are arranged in the ejection part; the first end of the fire blanket is fixedly connected to the ejection part, the 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 part 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 ejection portion.

[0014] Optionally, the ejection assembly includes a fixed seat, a baffle, a driving member, a transmission member and an elastic member; the fixed seat is arranged in the ejection part, the fixed seat has an installation cavity, the driving member, the transmission member and the elastic member are all arranged in the installation cavity, the baffle is arranged at the cavity opening of the installation cavity, and the opening member is located on the side of the baffle away from the cavity opening of the installation cavity; the driving member is transmission-connected to the transmission member, the transmission member is movably connected to the baffle, one end of the elastic member is connected to the fixed seat, 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 driving the baffle to move to release the restriction on the elastic member.

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

[0016] Optionally, the fire extinguishing medium includes one or a combination of two 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 also includes a temperature sensor; the temperature sensor is arranged on the top cover and surrounds the circumference of the explosion-proof valve, and the temperature sensor is electrically connected to the controller to monitor the temperature at the explosion-proof valve and feed back the temperature data to the controller.

[0019] Optionally, the battery body further includes a shell and a pole core; the shell has a cavity, the pole core is arranged in the cavity, and the top cover is arranged at the cavity opening of the cavity.

[0020] In a second aspect, an embodiment of the present application proposes a battery pack, comprising the battery described in the above embodiment.

[0021] In a third aspect, the present application provides a method for extinguishing a fire of a battery, which is applied to the battery described in the above embodiment or the battery pack described in the above embodiment.

[0022] Monitoring the opening state of the explosion-proof valve;

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

[0024] Then, the second fire extinguishing assembly is controlled to eject the fire blanket toward the explosion-proof valve so that the fire blanket covers the explosion-proof valve.

[0025] In an embodiment of the present application, the first fire extinguishing component and the second fire extinguishing component are respectively arranged 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, and the monitoring component monitors the opening state of the explosion-proof valve. When the explosion-proof valve is opened, the control component controls the first fire extinguishing component to spray the fire extinguishing medium toward the explosion-proof valve, and controls the second fire extinguishing component to eject the fire blanket toward the explosion-proof valve so that the fire blanket covers the explosion-proof valve.

[0026] In this way, when the explosion-proof valve of the battery explodes, the first fire extinguishing component first sprays the fire extinguishing medium to the explosion-proof valve, so that the fire extinguishing medium quickly isolates the battery component from the air; then the second fire extinguishing component ejects the fire blanket to the explosion-proof valve, thereby isolating the explosion-proof valve from the outside air again, preventing the outside air from entering the battery, and delaying the thermal runaway time of the battery. That is, by setting a two-stage fire extinguishing structure in the battery, the present application can extinguish the fire through the fire extinguishing medium and the fire blanket when the explosion-proof valve of the battery explodes, thereby improving the safety performance of the battery, reducing the risk of fire of the battery, and extending the escape time of the user.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0033] Figure 5 is along Figure 2Sectional view along line AA;

[0034] Figure 6 yes Figure 5 A partial enlarged view of

[0035] Figure 7 is along Figure 2 Sectional view along the midline BB;

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

[0037] Fig. 9 is a side view of a nozzle according to an embodiment of the present application;

[0038] Fig.10 is a top view of a nozzle according to an embodiment of the present application;

[0039] Fig.11 It is a flow chart of a fire extinguishing method according to an embodiment of the present application.

[0040] Reference numerals:

[0041] 1-top cover; 2-explosion-proof valve; 3-shell; 4-control assembly; 41-controller; 5-first fire extinguishing assembly; 51-fire extinguishing chamber; 52-nozzle; 6-second fire extinguishing assembly; 61-ejection assembly; 611-fixed seat; 612-baffle; 613-driving member; 614-transmission member; 615-elastic member; 616-tooth groove; 62-fire blanket; 63-base; 631-ejection part; 632-guide part; 633-guide groove; 64-opening member; 7-monitoring assembly; 71-wind speed sensor; 72-temperature sensor; 8-first end face; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0043] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The battery, battery pack and battery fire extinguishing provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0047] Alternatively, if Figures 1 to 10 As shown, an embodiment of the present application proposes a battery, comprising: 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 comprises 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 arranged on the top cover 1 and close to the explosion-proof valve 2; a fire extinguishing medium is provided in the first fire extinguishing component 5, and a fire extinguishing blanket 62 is provided in the second fire extinguishing component 6; 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 arranged on the top cover 1, for monitoring the opening state of the explosion-proof valve 2, the control component 4 is arranged on the top cover 1, for controlling the first fire extinguishing component 5 to spray the fire extinguishing medium toward the explosion-proof valve 2 when the explosion-proof valve 2 is opened, and controlling the second fire extinguishing component 6 to eject the fire extinguishing blanket 62 toward the explosion-proof valve 2 so that the fire extinguishing blanket 62 covers the explosion-proof valve 2.

[0048] In the embodiment of the present application, the first fire extinguishing component 5 and the second fire extinguishing component 6 are respectively arranged 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, and the monitoring component 7 monitors the opening state of the explosion-proof valve 2. When the explosion-proof valve 2 is detected to be opened, the control component 4 controls the first fire extinguishing component 5 to spray the fire extinguishing medium to the explosion-proof valve 2, and controls 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. In this way, when the explosion-proof valve of the battery explodes, the fire extinguishing medium is firstly sprayed to the explosion-proof valve 2 by the first fire extinguishing component 5, so that the fire extinguishing medium quickly isolates the battery components and the air; and then the fire blanket 62 is ejected to the explosion-proof valve 2 by the second fire extinguishing component 6, so that the explosion-proof valve 2 is isolated from the outside air again, so as to prevent the outside air from entering the battery and delay the thermal runaway time of the battery. That is, the present application provides a two-stage fire extinguishing structure in the battery, which can extinguish the fire through the fire extinguishing medium and the fire blanket 62 when the explosion-proof valve of the battery explodes, thereby improving the safety performance of the battery, reducing the fire risk of the battery, and extending the user's escape time.

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

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

[0051] It should be noted that if 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 fire extinguishing medium can be set in Figure 2 In the accommodating chamber of the fire extinguishing chamber 51 shown in the figure, a storage member, such as a box, an air bag, etc., can also be provided. The fire extinguishing medium can be provided in the box, the air bag; the fire blanket can be provided in the Figure 7 The ejection portion 631 of the base 63 shown can also be compressed into a spherical shape and arranged at the four corners of the base 63 .

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

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

[0055] Alternatively, if 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 arranged on the peripheral side 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 opened, control the operation of the first fire extinguishing component 5 and the second fire extinguishing component 6 in sequence.

[0056] In the embodiment of the present application, by arranging the wind speed sensor 71 around the explosion-proof valve 2 to monitor the wind speed information 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 operation of the first fire extinguishing component 5 and the second fire extinguishing component 6 in sequence when the explosion-proof valve 2 is opened. In this way, the operation of the first fire extinguishing component 5 and the second fire extinguishing component 6 is controlled based on the opening state of the explosion-proof valve 2, which is conducive to improving the accuracy of the control, thereby avoiding the 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 explodes, high-pressure gas is generated inside the battery, and the high-pressure gas is discharged through the explosion-proof valve 2. The wind speed sensor 71 can quickly monitor 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 state of the explosion-proof valve 2 can also be determined by monitoring information such as pressure changes at the explosion-proof valve 2 and temperature changes at the explosion-proof valve 2 to determine whether the explosion-proof valve 2 is in an open state.

[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, and the judgment module compares the actual monitored wind speed with the first threshold value. If the actual wind speed is greater than the first threshold value, it is judged that the explosion-proof valve 2 is open, and then the signal is transmitted to the control module, and 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 value, it is judged 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 duration of the timing module reaches the second threshold, the timing module transmits 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 may 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 wind speed sensor, etc. The controller may be one or more of a PLC controller, a DCS controller, a SCADA controller, etc.

[0062] In some embodiments, a plurality of wind speed sensors 71 may be provided, and the plurality of wind speed sensors 71 are arranged at intervals around the explosion-proof valve 2. In this way, the wind speed information at the explosion-proof valve 2 is monitored by the plurality of wind speed sensors 71, so as to improve the monitoring accuracy.

[0063] Alternatively, if 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 arranged on the top cover 1 near the explosion-proof valve 2, the fire extinguishing chamber 51 has a accommodating chamber, and the accommodating chamber is provided with a fire extinguishing medium, the nozzle 52 is arranged on the side of the fire extinguishing chamber 51 away from the top cover 1 and is connected to the accommodating chamber, and is electrically connected to the control component 4; the spraying direction of the nozzle 52 is toward the explosion-proof valve 2, and the control component 4 is used to control the nozzle 52 to spray the fire extinguishing medium toward the explosion-proof valve 2.

[0064] In the embodiment of the present application, the fire extinguishing chamber 51 is arranged on the top cover 1 near the explosion-proof valve 2, the fire extinguishing chamber 51 has a receiving chamber, the receiving chamber is provided with a fire extinguishing medium, the nozzle 52 is arranged on the side of the fire extinguishing chamber 51 away from the top cover 1 and is connected to the receiving chamber, and is electrically connected to the control component 4; the spraying direction of the nozzle 52 is toward the explosion-proof valve 2, and the control component 4 controls the nozzle 52 to spray the fire extinguishing medium toward the explosion-proof valve 2. In this way, the receiving chamber provides a receiving space for the fire extinguishing medium, and the nozzle 52 can continuously spray the fire extinguishing medium in the receiving chamber toward the explosion-proof valve 2, which is conducive to improving the stability of fire extinguishing.

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

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

[0067] Exemplarily, 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, so as to improve the uniformity of the spraying of the fire extinguishing medium and the coverage area of ​​the fire extinguishing medium.

[0068] In some embodiments, the fire extinguishing chamber 51 can be configured to be annular, arc-shaped, rectangular, etc., and the embodiments of the present application are not limited thereto.

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

[0070] In the embodiment of the present application, 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 to the first end face 8. In this way, the nozzle 52 sprays toward the explosion-proof valve 2, thereby spraying the fire extinguishing medium to the surface of the pole 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. A first channel is provided in the nozzle body, the first channel connects the nozzle and the fire extinguishing chamber 51, and the high-pressure pump is provided in the nozzle body and is electrically connected to the controller 41; when the controller 41 issues a fire extinguishing command to the nozzle 52, the high-pressure pump is started, and the fire extinguishing medium is pumped into the first channel. Since the size of the first channel is extremely small, the fire extinguishing medium is subjected to great pressure. This high pressure forces the fire extinguishing medium to pass through the first channel at high speed and spray out from the nozzle. At the moment when the fire extinguishing medium flows out of the nozzle, due to the surface tension of the fire extinguishing medium and the friction generated by the high-speed flow, it is torn into tiny droplets or dust to form a spray, and then sprayed onto the surface of the pole core through the explosion-proof valve 2.

[0072] In some embodiments, Figure 1 and Fig. 9 As shown, the third direction Z is the height direction of the battery, the first end surface is the plane where the upper surface of the top cover 1 is located, and the plane where the upper surface of the top cover 1 is located is perpendicular to the third direction Z. The spraying direction of the nozzle 52 refers to the direction in which the fire extinguishing medium is sprayed.

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

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

[0075] Alternatively, if Fig.10 As shown, the nozzle 52 has a fan-shaped spray port, and the opening angle of the spray port is 20°-160°.

[0076] In the embodiment of the present application, by setting a fan-shaped injection port, the opening angle E of the injection port is 20°-160°. In this way, the injection range of the injection port can be increased, and the spraying range can cover the explosion-proof valve 2, thereby improving the safety of fire extinguishing.

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

[0078] Alternatively, if 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 arranged on the top cover 1 and close to the explosion-proof valve 2, the base 63 includes an ejection part 631, the ejection assembly 61 and the fire blanket 62 are arranged in the ejection part 631; the first end of the fire blanket 62 is fixedly connected to the ejection part 631, the second end of the fire blanket 62 is connected to the ejection assembly 61, and 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 the embodiment of the present application, the base 63 is arranged on the top cover 1 and close to the explosion-proof valve 2, the ejection assembly 61 and the fire blanket 62 are arranged in the ejection part 631 of the base 63, the first end of the fire blanket 62 is fixedly connected to the ejection part 631, the second end of the fire blanket 62 is connected to the ejection assembly 61, and the ejection assembly 61 ejects 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. In this way, the ejection assembly 61 and the fire blanket 62 are arranged in the ejection part 631 of the base 63, and then the fire blanket 62 is ejected by the ejection assembly 61 to cover the explosion-proof valve 2, so that the space occupied by the ejection assembly 61 and the fire blanket 62 can be reduced.

[0080] In some embodiments, Figures 3 to 6 As shown, the ejection portion 631 has a cavity, and the direction of the cavity mouth is the same as the ejection direction of the ejection component 61; the ejection component 61 is arranged at the bottom of the cavity, the ejection component 61 is electrically connected to the controller 41, and the output end of the ejection component 61 is connected to the fire blanket 62, so that the fire blanket 62 is ejected.

[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 initial state of the spring is 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 an elastic force transmitted to the fire blanket 62, causing the fire blanket 62 to be ejected in a direction away from the ejection portion 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 ejects the spherical fire blanket 62 in a parabolic trajectory. The fire blanket 62 opens under the action of elasticity to cover the explosion-proof valve 2.

[0083] Alternatively, if Figures 3 to 7 As shown, the second fire extinguishing assembly 6 further 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 portion 631 .

[0084] In the embodiment of the present application, the opening member 64 is connected to the second end of the fire blanket 62, and the opening member 64 opens the fire blanket 62 and covers the explosion-proof valve 2 after the fire blanket 62 is ejected from the ejection portion 631. In this way, the fire blanket 62 is opened to the maximum extent, thereby increasing the area of ​​the fire blanket 62 covering the explosion-proof valve 2.

[0085] Specifically, Figure 3 and Figure 6 As shown, the fire blanket 62 is compressed in the first direction X and normally opens in the second direction Y, and 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 expansion member 64 can be one or more of a ceramic rod, a glass rod, and the like that are insulated and high temperature resistant.

[0087] Alternatively, if Figure 8 As shown, the ejection assembly 61 includes a fixed seat 611, a baffle 612, a driving member 613, a transmission member 614 and an elastic member 615; the fixed seat 611 is arranged in the ejection part 631, the fixed seat 611 has an installation cavity, the driving member 613, the transmission member 614 and the elastic member 615 are all arranged in the installation cavity, the baffle 612 is arranged at the cavity opening of the installation cavity, and the opening member 64 is located on the side of the baffle 612 away from the cavity opening of the installation cavity; the driving member 613 is transmission-connected with the transmission member 614, the transmission member 614 is movably connected with the baffle 612, one end of the elastic member 615 is connected with the fixed seat 611, and the other end of the elastic member 615 is abutted with 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 the embodiment of the present application, the fixing seat 611 is arranged in the ejection part 631, the driving member 613, the transmission member 614 and the elastic member 615 are all arranged in the installation cavity of the fixing seat 611, the baffle 612 is arranged at the cavity opening of the installation cavity, and the opening member 64 is located on the side of the baffle 612 away from the cavity opening of the installation cavity; the driving member 613 is connected to the transmission member 614 in a transmission manner, the transmission member 614 is movably connected to the baffle 612, one end of the elastic member 615 is connected to the fixing seat 611, and the other end of the elastic member 615 is in contact with the baffle 612, the driving member 613 drives the transmission member 614 to move, and then drives the baffle 612 to move to release the restriction on the elastic member 615. In this way, after the restriction on the elastic member 615 is released, the elastic member 615 hits the opening member 64 connected to the fire blanket 62, and then the fire blanket 62 is opened.

[0089] Specifically, the specific working principle of the ejection assembly 61 includes: the initial state of the elastic member 615 is in a compressed state, and the controller 41 is electrically connected to the driving member 613; when the controller 41 issues a secondary fire extinguishing command, the controller 41 controls the driving member 613 to start running, and drives the baffle 612 to move away (such as Figure 8 The elastic member 615 is then released to hit 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 driving 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] Alternatively, if 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 arranged 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, and the support rod is connected to the free end of the fire blanket 62 so that the fire blanket 62 is opened along the second direction Y; a guide groove 633 is provided in the guide portion 632, 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 is opened along the first direction X and covers the explosion-proof valve 2.

[0092] In the embodiment of the present application, 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 to the ejection part 631, and the other end extends in the first direction X in a direction away from the ejection part 631; the opening member 64 is a support rod, the support rod is connected to the second end of the fire blanket 62, and a guide groove 633 is arranged in the guide part 632, 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 when sliding, and then the fire blanket 62 is opened along the first direction X and covers 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. In this way, after the ejection assembly 61 applies elastic 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, the two ends of the support rod along the second direction Y are respectively connected to the slider, and a slide rail is provided in the guide groove 633, and the slider and the slide rail are slidably connected. In this way, during the movement of the support rod, the friction force on the support rod can be reduced, and the stability of the fire blanket 62 when it is opened can be improved.

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

[0096] In the embodiment of the present application, the fire extinguishing medium is one or a combination of two or more of carbon dioxide, carbon tetrachloride and dry powder. In this way, the non-flammability and non-toxicity of carbon dioxide, carbon tetrachloride and dry powder can be used to quickly prevent the fire from spreading in the pole core.

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

[0098] In the embodiment of the present application, at least one of glass fiber, carbon fiber, ceramic fiber and basalt is used to isolate the explosion-proof valve 2 from the outside air by utilizing the high temperature resistance of glass fiber, carbon fiber, ceramic fiber and basalt, thereby delaying the time for the battery to undergo thermal runaway.

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

[0100] In the embodiment of the present application, the thickness of the fire blanket 62 is set to be less than or equal to 2 mm. In this way, it is avoided that the fire blanket 62 that is too thick occupies a large space, which is not conducive to the arrangement of the fire blanket 62.

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

[0102] In some embodiments, the open 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 open 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 projection area of ​​the explosion-proof valve 2 on the first end surface.

[0103] Alternatively, if Figure 1 and Figure 2 As shown, the monitoring component 7 also includes a temperature sensor 72; the temperature sensor 72 is arranged on the top cover 1 and surrounds the circumference of the explosion-proof valve 2, and the temperature sensor 72 is electrically connected to the controller 41 for monitoring the temperature at the explosion-proof valve 2 and feeding back the temperature data to the controller 41.

[0104] In the embodiment of the present application, by arranging the temperature sensor 72 on the top cover 1 and surrounding the circumference 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 back the temperature data to the controller 41. In this way, when the battery has thermal runaway, the temperature sensor 72 will also monitor the temperature change at the explosion-proof valve 2, and then monitor and collect the temperature change data of the entire battery during the thermal runaway period.

[0105] In addition, the temperature sensor 72 can also be electrically connected to the receiving module in the controller 41; on the basis that the actual wind speed is greater than the first threshold, the judgment module receives the temperature data transmitted by the temperature sensor 72, and if the actual temperature is greater than the third threshold, it is judged that the explosion-proof valve 2 is opened, and then the signal is transmitted to the control module, and the control module controls the operation of the first fire extinguishing component 5 through the output module. In this way, through the two judgments of wind speed and temperature, the possibility of misjudgment by the controller 41 is reduced, and the accuracy of the judgment is improved. If the actual temperature is less than or equal to the third threshold, it is judged that the explosion-proof valve 2 is normal and the control module does not work.

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

[0107] In some embodiments, a plurality of temperature sensors 72 may be provided, and the temperature sensors are arranged at intervals around the explosion-proof valve 2. In this way, the temperature information at the explosion-proof valve 2 is monitored by providing a plurality of temperature sensors 72, so as to improve the accuracy of monitoring.

[0108] Alternatively, if Figure 1 As shown, the battery body also 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.

[0109] In the embodiment of the present application, the pole core is arranged in the cavity, and the top cover 1 is arranged at the cavity opening of the cavity, so that the fire extinguishing medium of the first fire extinguishing assembly 5 can enter the cavity through the explosion-proof valve 2 and then be adsorbed on the surface of the pole core.

[0110] Optionally, an embodiment of the present application provides a battery pack, comprising a battery as in the above embodiment.

[0111] In the embodiment of the present application, the first fire extinguishing component 5 and the second fire extinguishing component 6 are respectively arranged 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, and the monitoring component 7 monitors the opening state of the explosion-proof valve 2. When the explosion-proof valve 2 is detected to be opened, the control component 4 controls the first fire extinguishing component 5 to spray the fire extinguishing medium to the explosion-proof valve 2, and controls 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. In this way, when the explosion-proof valve of the battery explodes, the fire extinguishing medium is firstly sprayed to the explosion-proof valve 2 by the first fire extinguishing component 5, so that the fire extinguishing medium quickly isolates the battery components and the air; and then the fire blanket 62 is ejected to the explosion-proof valve 2 by the second fire extinguishing component 6, so that the explosion-proof valve 2 is isolated from the outside air again, so as to prevent the outside air from entering the battery and delay the thermal runaway time of the battery. That is, the present application provides a two-stage fire extinguishing structure in the battery, which can extinguish the fire through the fire extinguishing medium and the fire blanket 62 when the battery produces thermal runaway, thereby improving the safety performance of the battery, reducing the fire risk of the battery, and extending the user's escape time.

[0112] Alternatively, if Fig.11 As shown, the embodiment of the present application proposes a battery fire extinguishing method, which is applied to the battery in the above embodiment or the battery pack in the above embodiment. The specific steps of the fire extinguishing method are as follows:

[0113] Step 101: monitoring the opening state of the 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 a preset wind speed threshold and a preset pressure threshold respectively, the controller 41 determines that the explosion-proof valve 2 is in an open state.

[0115] Step 102: When the explosion-proof valve 2 is open, firstly control the first fire extinguishing component 5 to spray the fire extinguishing medium toward 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, and sprays the fire extinguishing medium stored in the fire extinguishing chamber 51 toward the explosion-proof valve 2.

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

[0118] Specifically, the controller 41 sends an opening instruction to the ejection assembly 61 , and controls 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. When the controller 41 controls the nozzle 52 to open,

[0120] The timing module starts to time. After the timing time of the timing module reaches a preset time, the controller 41 sends an opening instruction to the ejection component 61 to control the ejection component 61 to operate.

[0121] In the present application, when the explosion-proof valve 2 of the battery explodes, the first fire extinguishing component 5 first sprays the fire extinguishing medium to the explosion-proof valve 2, so that the fire extinguishing medium quickly isolates the battery components and the air; and then the second fire extinguishing component 6 ejects the fire blanket 62 to the explosion-proof valve 2, thereby isolating the explosion-proof valve 2 from the outside air again, preventing the outside air from entering the battery, thereby providing oxygen to the pole core and delaying the thermal runaway time of the battery. That is, by setting a two-stage fire extinguishing structure in the battery, the present application can extinguish the fire through the fire extinguishing medium and the fire blanket 62 when the explosion-proof valve 2 of the battery explodes, thereby improving the safety performance of the battery, reducing the risk of fire of the battery, and extending the escape time of the user.

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

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A battery, characterized in that: include: 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 comprises a top cover (1), the top cover (1) is provided with an explosion-proof valve (2), the first fire extinguishing component (5) and the second fire extinguishing component (6) are respectively provided on the top cover (1) and close to the explosion-proof valve (2); the control component (4) is respectively electrically connected to the first fire extinguishing component (5), the second fire extinguishing component (6) and the monitoring component (7); The first fire extinguishing component (5) is provided with a fire extinguishing medium, and the second fire extinguishing component (6) is provided with a fire extinguishing blanket (62); The monitoring component (7) is arranged on the top cover (1) and is used to monitor the opening state of the explosion-proof valve (2); The control component (4) is arranged on the top cover (1) and is used to control the first fire extinguishing component (5) to spray the fire extinguishing medium toward the explosion-proof valve (2) when the explosion-proof valve (2) is opened, and to control the second fire extinguishing component (6) to eject the fire extinguishing blanket (62) toward the explosion-proof valve (2) so that the fire extinguishing blanket (62) covers the explosion-proof valve (2).

2. The battery according to claim 1, characterized in that The control component (4) comprises a controller (41); the monitoring component (7) comprises 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 arranged on the peripheral side of the explosion-proof valve (2) and is used to detect 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 operation of the first fire extinguishing component (5) and the second fire extinguishing component (6) in sequence when the explosion-proof valve (2) is opened.

3. The battery according to claim 1, characterized in that The first fire extinguishing assembly (5) comprises a fire extinguishing chamber (51) and a spray head (52); The fire extinguishing chamber (51) is arranged on the top cover (1) at a position close to the explosion-proof valve (2), the fire extinguishing chamber (51) has a containing chamber, the fire extinguishing medium is arranged in the containing chamber, the nozzle (52) is arranged on a side of the fire extinguishing chamber (51) away from the top cover (1), is communicated with the containing chamber, and is electrically connected to the control component (4); the spraying direction of the nozzle (52) is toward the explosion-proof valve (2), and the control component (4) is used to control the nozzle (52) to spray the fire extinguishing medium toward the explosion-proof valve (2).

4. The battery according to claim 3, characterized in that The fire extinguishing chamber (51) is arranged around the explosion-proof valve (2), and a plurality of the nozzles (52) are provided; the plurality of nozzles (52) are arranged at intervals along the circumference of the explosion-proof valve (2).

5. The battery according to claim 3, characterized in that The top cover (1) has a first end surface, the explosion-proof valve (2) is embedded in the first end surface (8), and the spraying direction of the nozzle (52) is set at an angle D with the first end surface (8), satisfying: 10°≤D≤85°.

6. The battery according to claim 5, characterized in that The nozzle (52) has a fan-shaped injection port, and the opening angle of the injection port is 20°-160°.

7. The battery according to any one of claims 1 to 6, characterized in that: The second fire extinguishing assembly (6) comprises an ejection assembly (61) and a base (63); The base (63) is arranged on the top cover (1) and close to the explosion-proof valve (2), the base (63) includes an ejection part (631), the ejection assembly (61) and the fire blanket (62) are arranged in the ejection part (631); the first end of the fire blanket (62) is fixedly connected to the ejection part (631); the second end of the fire blanket (62) is connected to the ejection assembly (61), and 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).

8. The battery according to claim 7, characterized in that The second fire extinguishing assembly (6) further comprises an opening member (64); the opening member (64) is connected to the second end of the fire extinguishing blanket (62), and the opening member (64) is used to open the fire extinguishing blanket (62) and cover the explosion-proof valve (2) after the fire extinguishing blanket (62) is ejected from the ejection portion (631).

9. The battery according to claim 8, characterized in that The ejection assembly (61) comprises a fixing seat (611), a baffle (612), a driving member (613), a transmission member (614) and an elastic member (615); The fixing seat (611) is arranged in the ejection portion (631), the fixing seat (611) has a mounting cavity, the driving member (613), the transmission member (614) and the elastic member (615) are all arranged in the mounting cavity, the baffle (612) is arranged at the cavity opening of the mounting cavity, and the opening member (64) is located on a side of the baffle (612) away from the cavity opening of the mounting cavity; The driving member (613) is in transmission connection with the transmission member (614), the transmission member (614) is movably connected with the baffle (612), one end of the elastic member (615) is connected with the fixing seat (611), and the other end of the elastic member (615) is in contact with 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).

10. The battery according to claim 8, characterized in that The base (63) further 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 ejection assembly (61) ejects along the first direction (X), the guide portion (632) is arranged 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, and the support rod is connected to the second end of the fire blanket (62) so that the fire blanket (62) is opened along the second direction (Y); a guide groove (633) is provided in the guide portion (632), 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) is opened along the first direction (X) and covers the explosion-proof valve (2).

11. The battery according to claim 1, characterized in that The fire extinguishing medium includes one or a combination of two or more of carbon dioxide, carbon tetrachloride and dry powder.

12. The battery according to claim 1, characterized in that 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.

13. The battery according to claim 2, characterized in that The monitoring component (7) further comprises a temperature sensor (72); the temperature sensor (72) is arranged 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 back the temperature data to the controller (41).

14. The battery according to claim 1, characterized in that The battery body also 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.

15. A battery pack, characterized in that: Comprising a battery as claimed in any one of claims 1 to 14.

16. A battery fire extinguishing method, applied to the battery according to any one of claims 1 to 14 or the battery pack according to claim 15, characterized in that: Monitoring the opening state of the explosion-proof valve (2); When the explosion-proof valve (2) is opened, the first fire extinguishing component (5) is first controlled to spray a fire extinguishing medium toward the explosion-proof valve (2); The second fire extinguishing component (6) is then controlled to eject the fire extinguishing blanket (62) toward the explosion-proof valve (2) so that the fire extinguishing blanket (62) covers the explosion-proof valve (2).

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