CN115569340A - Fire extinguishing device - Google Patents

Abstract

The invention relates to a fire extinguishing device, which comprises a lower shell, an upper shell and a plugging piece, wherein the lower shell is used for being installed on a battery cell and is provided with a first cavity communicated with the interior of the battery cell; the upper shell is arranged above the lower shell and is provided with a second chamber, and a channel for communicating the first chamber with the second chamber is arranged on the wall of the second chamber; the blocking piece is arranged in the second chamber, a flow hole is formed in the blocking piece, and a cavity in the second chamber and above the blocking piece is used for containing a fire extinguishing agent; the block piece has a first state and a second state, the block piece is configured to move in the second chamber to switch between the first state and the second state; when being in the first state, the shutoff piece laminating in the chamber wall of second cavity, shutoff piece shutoff passageway, and the chamber wall shutoff opening of second cavity, when being in the second state, have the clearance between the chamber wall of shutoff piece and second cavity, the fire extinguishing agent can flow through opening, passageway, first cavity in proper order.

Description

Fire extinguishing device

Technical Field

The invention relates to the technical field of battery cell safety, in particular to a fire extinguishing device.

Background

The thermal runaway of the lithium battery is easily caused due to poor heat dissipation caused by short circuit, overcharge or overhigh ambient temperature of the battery, and the internal pressure of the battery is increased sharply due to the thermal runaway, so that the ignition and explosion of the lithium battery are caused. The current condition to the lithium cell explosion that catches fire generally adopts the manual work to put out a fire with fire extinguishing agent externally, but, the mode cooling effect that the outside was put out a fire is not good, and the chemical reaction of lithium cell inside often still takes place in addition, consequently the scheduling problem that reburning appears very easily.

Disclosure of Invention

Based on this, it is necessary to provide a fire extinguishing apparatus for the problem of lithium battery fire extinguishing.

A fire suppression apparatus, comprising:

a lower housing for mounting on a battery cell, the lower housing having a first chamber for communicating with the interior of the battery cell;

the upper shell is arranged above the lower shell and provided with a second chamber, and a channel for communicating the first chamber with the second chamber is arranged on the wall of the second chamber;

the blocking piece is arranged in the second chamber, a flow hole is formed in the blocking piece, and a cavity in the second chamber and above the blocking piece is used for containing a fire extinguishing agent;

the closure having a first state and a second state, the closure being configured to move within the second chamber to switch between the first state and the second state;

when the fire extinguishing device is in the first state, the blocking piece is attached to the cavity wall of the second cavity, the blocking piece blocks the channel, the cavity wall of the second cavity blocks the flow hole, when the fire extinguishing device is in the second state, a gap is formed between the blocking piece and the cavity wall of the second cavity, and the fire extinguishing agent can flow out through the flow hole, the channel and the first cavity in sequence.

In one embodiment, the bottom wall of the second chamber is provided with the passage, the plugging piece is attached to the bottom wall in the first state, and a gap is reserved between the plugging piece and the bottom wall in the second state;

the fire extinguishing device further comprises a pushing piece arranged in the first chamber, a pushing hole is formed in the bottom wall, and the pushing piece is configured to move upwards to penetrate through the pushing hole to push the blocking piece to move in the first chamber to be separated from the bottom wall.

In one embodiment, the plugging device further comprises a first elastic piece, the first elastic piece is elastically abutted between the pushing piece and the upper shell, and the first elastic piece is used for driving the pushing piece to move downwards through self resilience force so as to enable the plugging piece to be attached to the bottom wall.

In one embodiment, the pushing part comprises an annular seat and two pushing parts, the two pushing parts are arranged oppositely and are arranged on the same side of the annular seat, an installation space for accommodating the first elastic piece is formed between the annular seat and the two pushing parts in an enclosing manner, and the pushing parts can penetrate through the pushing holes to push the blocking piece to move.

In one embodiment, the upper housing has a connecting portion extending downward, the channel extends through the connecting portion, and the first elastic member and the pushing member are both sleeved on the connecting portion.

In one embodiment, the device further comprises a sealing member arranged between the pushing member and the wall of the first chamber, and the sealing member is used for sealing a gap between the pushing member and the wall of the first chamber.

In one embodiment, the first chamber has a conical shape, and has a large end and a small end, the large end faces the second chamber, and the small end faces the battery cell.

In one embodiment, the second chamber has an opening communicating with the outside, and the fire extinguishing apparatus further includes an upper cover for closing the opening.

In one embodiment, the sealing device further comprises a second elastic piece, and the second elastic piece elastically abuts between the upper cover and the blocking piece.

In one embodiment, the upper shell is provided with an air hole communicated with the outside, and the fire extinguishing device further comprises a hole plug used for plugging the air hole.

The invention has the beneficial effects that:

above-mentioned extinguishing device, to descend the casing to install on electric core, and the first cavity of casing and the inside intercommunication of electric core down, will go up the casing and set up in the top of casing down, through set up the passageway on the chamber wall at the second cavity to communicate first cavity and second cavity. Set up the shutoff piece in the second cavity, and the cavity that is located the shutoff piece top in the second cavity is used for holding fire extinguishing agent, sets up the shutoff piece in the below of fire extinguishing agent promptly, and when the shutoff piece was in first state, the shutoff piece laminating was in the chamber wall of second cavity to utilize the shutoff piece shutoff passageway, utilized the chamber wall shutoff of second cavity to have blocked the opening of shutoff piece in addition, prevented that fire extinguishing agent from flowing through passageway or opening. The shutoff piece moves in the second cavity to switch over to the second state from first state, when the shutoff piece is in the second state, have the clearance between the chamber wall of shutoff piece and second cavity, the fire extinguishing agent receives the action of gravity this moment, flows in to the inside of electric core through opening, passageway, first cavity in proper order, puts out a fire to electric core inside and handles. According to the fire extinguishing device provided by the invention, the blocking piece moves in the second cavity, so that the first state and the second state are switched, when a fire occurs in the battery cell, the blocking piece is in the second state, a fire extinguishing agent flows into the battery cell through the circulation hole, the passage and the first cavity in sequence, the fire extinguishing treatment is carried out on the interior of the battery cell, and the fire extinguishing effect is improved by cooling and extinguishing the interior of the battery cell. When the inside normal operating condition that is in of electric core, the shutoff piece is in first state, prevents that the fire extinguishing agent from flowing into the inside influence that causes the operation of electric core.

Drawings

FIG. 1 is a schematic structural diagram of a fire extinguishing apparatus according to an embodiment of the present invention;

FIG. 2 is an exploded view of a fire suppression apparatus provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first view angle of the upper housing according to the embodiment of the present invention;

fig. 4 is a structural diagram of a second perspective of the upper housing according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first view angle of the lower housing according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second viewing angle of the lower housing according to the embodiment of the present invention.

In the figure:

100. a lower housing; 110. a first chamber;

200. an upper housing; 210. a second chamber; 211. a push hole; 220. a connecting portion; 221. a channel; 230. air holes;

300. a blocking member; 310. a flow-through hole;

400. a pusher member; 410. an annular seat; 420. a pushing part;

500. a first elastic member;

600. an upper cover; 610. a cover body; 620. a housing portion;

700. a second elastic member;

800. and (4) plugging the hole.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

An embodiment of the present invention provides a fire extinguishing apparatus, as shown in fig. 1 and fig. 2, the fire extinguishing apparatus includes a lower casing 100, an upper casing 200, and a blocking piece 300, the lower casing 100 is used for being mounted on a battery cell, the lower casing 100 has a first chamber 110 for communicating with the inside of the battery cell; the upper shell 200 is arranged above the lower shell 100, the upper shell 200 is provided with a second chamber 210, and a channel 221 which is communicated with the first chamber 110 and the second chamber 210 is arranged on the wall of the second chamber 210; the blocking piece 300 is arranged in the second chamber 210, the blocking piece 300 is provided with a flow hole 310, and a cavity above the blocking piece 300 in the second chamber 210 is used for containing fire extinguishing agent; the closure 300 has a first state and a second state, the closure 300 being configured to move within the second chamber 210 to switch between the first state and the second state; when the fire extinguishing device is in the first state, the blocking piece 300 is attached to the wall of the second chamber 210, the blocking piece 300 blocks the passage 221, the wall of the second chamber 210 blocks the flow hole 310, when the fire extinguishing device is in the second state, a gap is formed between the blocking piece 300 and the wall of the second chamber 210, and the fire extinguishing agent can flow out through the flow hole 310, the passage 221 and the first chamber 110 in sequence.

According to the fire extinguishing apparatus, the lower casing 100 is mounted on the battery cell, the first cavity 110 of the lower casing 100 is communicated with the interior of the battery cell, the upper casing 200 is arranged above the lower casing 100, and the channel 221 is arranged on the wall of the second cavity 210, so that the first cavity 110 is communicated with the second cavity 210. The blocking piece 300 is arranged in the second chamber 210, and the cavity above the blocking piece 300 in the second chamber 210 is used for containing the fire extinguishing agent, that is, the blocking piece 300 is arranged below the fire extinguishing agent, when the blocking piece 300 is in the first state, the blocking piece 300 is attached to the wall of the second chamber 210, so that the channel 221 is blocked by the blocking piece 300, and the flow hole 310 of the blocking piece 300 is blocked by the wall of the second chamber 210, thereby preventing the fire extinguishing agent from flowing out through the channel 221 or the flow hole 310. The blocking piece 300 moves in the second chamber 210, so that the first state is switched to the second state, when the blocking piece 300 is in the second state, a gap is formed between the blocking piece 300 and the wall of the second chamber 210, and at the moment, the fire extinguishing agent flows into the interior of the battery cell through the flow hole 310, the channel 221 and the first chamber 110 in sequence under the action of gravity, so that the fire extinguishing treatment is performed on the interior of the battery cell. According to the fire extinguishing device provided by the embodiment of the invention, the plugging piece 300 moves in the second chamber 210, so that the first state and the second state are switched, when a fire occurs in the battery cell, the plugging piece 300 is in the second state, a fire extinguishing agent sequentially flows into the battery cell through the flow hole 310, the passage 221 and the first chamber 110, the fire extinguishing treatment is performed on the interior of the battery cell, and the fire extinguishing effect is improved by cooling and extinguishing the interior of the battery cell. When the interior of the battery cell is in a normal working state, the blocking piece 300 is in a first state, so that the fire extinguishing agent is prevented from flowing into the interior of the battery cell to influence the operation of the battery cell.

It should be noted that, in some embodiments, the fire extinguishing agent is a fluid fire extinguishing agent, and the fire extinguishing agent can flow into the channel 221 through the gap between the blocking piece 300 and the wall of the second chamber 210, then flow into the first chamber 110 through the channel 221, and finally flow into the interior of the battery cell through the first chamber 110. In some embodiments, the fire extinguishing agent is a powdered fire extinguishing agent, and the powdered fire extinguishing agent also has fluidity and can flow into the interior of the battery cell through the flow holes 310, the channels 221 and the first chamber 110.

In some embodiments, as shown in fig. 2 to 4, the bottom wall of the second chamber 210 is provided with a channel 221, in the first state, the blocking member 300 is attached to the bottom wall, and in the second state, there is a gap between the blocking member 300 and the bottom wall; the fire extinguishing apparatus further comprises a pushing member 400 disposed in the first chamber 110, the bottom wall of which is opened with a pushing hole 211, the pushing member 400 being configured to move upward to push the block piece 300 through the pushing hole 211 to move in the first chamber 110 to be separated from the bottom wall. The channel 221 is arranged on the bottom wall of the second chamber 210, in the first state, the blocking piece 300 is attached to the bottom wall, so that the channel 221 is blocked, the fire extinguishing agent cannot flow into the first chamber 110 through the channel 221, when fire and explosion occur inside the battery cell, the internal pressure of the battery cell is increased, the air pressure pushes the pushing piece 400 in the first chamber 110 to move upwards, the pushing piece 300 is pushed to move upwards through the pushing hole 211, a gap is formed between the blocking piece 300 and the bottom wall, the blocking piece 300 is in the second state, and the fire extinguishing agent flows into the battery cell through the flow hole 310, the channel 221 and the first chamber 110.

Specifically, as shown in fig. 2 to 4, the second chamber 210 is a cylindrical cavity with an opening, and the second chamber 210 extends toward the first chamber 110, a radial dimension of the second chamber 210 is smaller than a radial dimension of the first chamber 110, and a portion of the second chamber 210 can extend into the first chamber 110. The plugging piece 300 is a cylinder, the diameter of the plugging piece 300 is equal to that of the second chamber 210, the end face of the plugging piece 300 can be attached to the bottom wall of the second chamber 210, and the outer peripheral face of the plugging piece 300 can be attached to the side wall of the second chamber 210. A passage 221 is provided in the bottom wall of the second chamber 210 and a flow opening 310 is provided in the closure 300 through the closure 300 to facilitate the flow and release of the fire suppressant when the closure 300 is in the second state.

In some embodiments, when the fire explosion inside the battery cell has been extinguished by the fire extinguishing agent, the pusher 400 moves downward by gravity, and the blocking member 300 has no upward thrust and also moves downward by gravity to contact the bottom wall of the second chamber 210.

In some embodiments, as shown in fig. 2, the fire extinguishing apparatus further includes a first elastic member 500, the first elastic member 500 elastically abuts between the pushing member 400 and the upper housing 200, and the first elastic member 500 is configured to drive the pushing member 400 to move downward by its own resilience force, so as to make the blocking member 300 abut against the bottom wall. The first elastic member 500 is disposed between the second chamber 210 and the pushing member 400, when the battery cell explodes and the pushing member 400 moves upward under the action of high pressure, the first elastic member 500 is compressed, and when the explosion accident caused by ignition inside the battery cell is eliminated, the pushing member 400 moves downward under the action of its own gravity and the resilience of the first elastic member 500, so that the blocking member 300 can automatically return to the first state.

Specifically, as shown in fig. 2, the pushing member 400 includes an annular seat 410 and two pushing portions 420, the two pushing portions 420 are disposed opposite to each other and are disposed on the same side of the annular seat 410, an installation space for accommodating the first elastic member 500 is defined between the annular seat 410 and the two pushing portions 420, and the pushing portions 420 can pass through the pushing holes 211 to push the blocking member 300 to move. An installation space is formed between the annular seat 410 and the two pushing parts 420, and the first elastic member 500 is arranged in the installation space and has a certain limiting effect on the first elastic member 500. Two promotion portions 420 are under the high pressure effect, and the homoenergetic upward movement passes and promotes hole 211 to promote the shutoff piece 300 motion, two promotion portions 420 have increased thrust, have improved the promotion effect that promotes the shutoff piece 300 motion, have increased the speed of releasing the fire extinguishing agent.

Specifically, as shown in fig. 2 to 4, the pushing portion 420 of the pushing member 400 is an arc-shaped plate, the two arc-shaped plates are arranged oppositely, the number of the pushing holes 211 is two, the shape of the pushing hole 211 is adapted to the shape of the arc-shaped plate, when the blocking member 300 is in the first state, the pushing portion 420 extends into the pushing hole 211, the upper end surface of the pushing portion 420 is flush with the bottom wall of the second chamber 210, and the fire extinguishing agent is prevented from flowing out through the pushing hole 211.

Specifically, as shown in fig. 2 to 4, the upper housing 200 extends downward to form a connecting portion 220, the channel 221 penetrates through the connecting portion 220, and the first elastic member 500 and the pushing member 400 are all sleeved on the connecting portion 220. The upper housing 200 is extended downward, that is, extended in the direction of the lower housing 100, and the connecting portion 220 is extended through the passage 221, and the connecting portion 220 can be extended into the first chamber 110 of the lower housing 100, thereby facilitating the transportation of the fire extinguishing agent. And the first elastic member 500 and the pushing member 400 are sleeved on the connecting portion 220, so that the moving directions of the first elastic member 500 and the pushing member 400 are limited, and the pushing member 400 and the first elastic member 500 can only move up and down.

Specifically, the connecting portion 220 is disposed on the outer bottom wall of the second chamber 210 and extends downward, and the connecting portion 220 has a cylindrical shape, i.e., the channel 221 has a cylindrical shape. It can be seen that the straight distance between the two points is shortest, so that the passage 221 is formed in a cylindrical shape, the length of the flow path of the fire extinguishing agent is reduced, the operation speed of the fire extinguishing agent is increased, and the fire extinguishing efficiency is improved.

In some embodiments, the connection part 220 is formed in a V shape on the outer bottom wall of the second chamber 210, and the channel 221 penetrates through the connection part 220, so that the transportation of the fire extinguishing agent can be realized.

In some embodiments, a V-shaped connection portion 220 is disposed on a sidewall of the second chamber 210, one end of the connection portion 220 is connected to the second chamber 210, the other end of the connection portion extends into the first chamber 110, and a channel 221 penetrates through the connection portion 220, so that the channel 221 is V-shaped, and the fire extinguishing agent can also flow from the second chamber 210 to the first chamber 110. In addition, when the V-shaped connecting portion 220 is provided on the side wall of the second chamber 210, the blocking member 300 moves in the second chamber 210, so that the outer circumferential surface of the blocking member 300 can abut against one end of the channel 221 on the side wall of the second chamber 210, thereby achieving the purpose of blocking the channel 221.

As shown in fig. 1 and 2, the second chamber 210 has an opening communicating with the outside, and the fire extinguishing apparatus further includes an upper cover 600, and the upper cover 600 is used to close the opening. The second chamber 210 is provided with an opening to communicate with the outside, and when the fire extinguishing agent in the second chamber 210 is insufficient in capacity, the fire extinguishing agent can be added for repeated use. An upper cover 600 is disposed above the opening, and the upper cover 600 can block the opening to prevent the fire extinguishing agent in the second chamber 210 from flowing out through the opening.

As shown in fig. 2, the fire extinguishing apparatus further includes a second elastic member 700, and the second elastic member 700 is elastically supported between the upper cover 600 and the blocking member 300. By providing the second elastic member 700, the upper cover 600 elastically abuts against the blocking member 300 through the second elastic member 700, so that the blocking member 300 can be attached to the bottom wall of the second chamber 210.

Specifically, as shown in fig. 2, the upper cover 600 includes a cover body 610 and a sleeve portion 620, the sleeve portion 620 is disposed at one end of the cover body 610 and extends downward, and the sleeve portion 620 sequentially passes through the second elastic member 700 and the blocking member 300. The cover 610 extends downward, i.e. extends toward the upper housing 200 to form a sleeve 620, and the second elastic member 700 and the plugging member 300 are sleeved on the sleeve 620 to limit the moving direction of the second elastic member 700 and the plugging member 300, so that the second elastic member 700 and the plugging member 300 can only move up and down.

More specifically, in some embodiments, the cover body 610 of the upper cover 600 covers the opening, and an end surface of the cover body 610 abuts against an upper end surface of the upper housing 200, thereby blocking the opening. In some embodiments, the cover 610 is an interference fit with the opening. In some embodiments, the cover 610 is removably attached to the opening.

More specifically, the bore diameter of the channel 221 is r1, and the radius of the sleeve portion 620 is r2, where r2< r1, i.e., the sleeve portion 620 can partially extend into the channel 221.

As shown in fig. 2 and 3, the upper case 200 is provided with an air hole 230 communicating with the outside, and the fire extinguishing apparatus further includes a hole plug 800 for blocking the air hole 230. Through set up gas pocket 230 on last casing 200, the inside gaseous of electric core can reduce the inside atmospheric pressure of electric core through gas pocket 230 release, reaches the purpose of pressure release. The hole plug 800 of the fire extinguishing apparatus can partially extend into the air hole 230 to block the air hole 230, and when the air pressure inside the battery cell rises, the air can push out the hole plug 800, so that pressure relief is realized.

As shown in fig. 5 and 6, the first chamber 110 has a tapered shape, and has a large end facing the second chamber 210 and a small end facing the battery cell. Providing first chamber 110 with a conical shape facilitates placement of pusher 400 within first chamber 110, the bottom wall of pusher 400 being able to abut the chamber wall of first chamber 110, the chamber wall of first chamber 110 providing a supporting force to pusher 400. And the small end of the first chamber 110 faces the battery cell, and the large end faces the second chamber 210, so that gas generated by explosion inside the battery cell can be conveniently gathered in the first chamber 110, and the pushing member 400 can be conveniently pushed to move upwards.

In some embodiments, the fire suppression apparatus further comprises a seal disposed between the pusher 400 and the chamber wall of the first chamber 110, the seal for sealing a gap between the pusher 400 and the chamber wall of the first chamber 110. By providing a seal to seal the gap between the pusher 400 and the wall of the first chamber 110, the flow of fire suppressant into the cell is reduced during normal operation of the cell.

Specifically, the sealing element is a sealing ring, and the sealing element is made of a rubber material, the sealing element is disposed on the annular seat 410 of the pushing element 400, when the plugging element 300 is in the first state, the pushing element 400 is disposed in the first chamber 110, and the sealing ring abuts against the wall of the first chamber 110.

Referring back to fig. 1 and 2, the lower casing is in a diamond shape, the upper casing is in a shape matched with the lower casing, the lower casing can be packaged on the battery cell, and the lower casing is in a diamond shape, so that the lower casing can be packaged conveniently.

In some embodiments, the lower casing may be embedded on the battery cell by welding, or in some embodiments, the lower casing may be connected to the battery cell by glue or the like, or in some embodiments, the lower casing may be connected to the battery cell by screws or the like.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. A fire suppression apparatus, comprising:

a lower casing (100) for mounting on a battery cell, the lower casing (100) having a first chamber (110) for communicating with the interior of the battery cell;

the upper shell (200) is arranged above the lower shell (100), the upper shell (200) is provided with a second chamber (210), and a channel (221) for communicating the first chamber (110) with the second chamber (210) is arranged on the wall of the second chamber (210);

a closure (300) disposed in the second chamber (210), the closure (300) having a flow aperture (310) disposed therein, a cavity in the second chamber (210) above the closure (300) for containing a fire suppressant;

the closure (300) having a first state and a second state, the closure (300) being configured to move within the second chamber (210) to switch between the first state and the second state;

when the fire extinguishing device is in the first state, the blocking piece (300) is attached to the cavity wall of the second cavity (210), the blocking piece (300) blocks the channel (221), the cavity wall of the second cavity (210) blocks the flow hole (310), when the fire extinguishing device is in the second state, a gap is formed between the blocking piece (300) and the cavity wall of the second cavity (210), and the fire extinguishing agent can flow out through the flow hole (310), the channel (221) and the first cavity (110) in sequence.

2. A fire extinguishing apparatus according to claim 1, wherein the channel (221) is provided in a bottom wall of the second chamber (210), the closure (300) being adapted to abut against the bottom wall in the first state, and the closure (300) being spaced from the bottom wall in the second state;

the fire extinguishing device further comprises a pushing piece (400) arranged in the first chamber (110), a pushing hole (211) is formed in the bottom wall, and the pushing piece (400) is configured to move upwards to push the blocking piece (300) to move in the first chamber (110) through the pushing hole (211) to be separated from the bottom wall.

3. The fire extinguishing apparatus according to claim 2, further comprising a first elastic member (500), wherein the first elastic member (500) is elastically supported between the pushing member (400) and the upper housing (200), and the first elastic member (500) is used for driving the pushing member (400) to move downwards through self-resilience force so as to enable the blocking member (300) to be attached to the bottom wall.

4. A fire extinguishing apparatus according to claim 3, wherein the urging member (400) comprises an annular seat (410) and two urging portions (420), the two urging portions (420) being disposed opposite and on the same side of the annular seat (410), an installation space for accommodating the first elastic member (500) being defined between the annular seat (410) and the two urging portions (420), the urging portions (420) being capable of urging the blocking member (300) through the urging holes (211) for movement.

5. A fire extinguishing apparatus according to claim 3, wherein the upper housing (200) has a connecting portion (220) extending downward, the channel (221) extends through the connecting portion (220), and the first resilient member (500) and the urging member (400) are fitted over the connecting portion (220).

6. Fire extinguishing apparatus according to claim 2, further comprising a seal disposed between the pusher (400) and a wall of the first chamber (110), the seal for sealing a gap between the pusher (400) and the wall of the first chamber (110).

7. Fire extinguishing apparatus according to claim 1, characterized in that the first chamber (110) is conical in shape with a large end facing the second chamber (210) and a small end for facing the battery cell.

8. A fire extinguishing apparatus according to claim 1, characterized in that the second chamber (210) has an opening communicating with the outside, the fire extinguishing apparatus further comprising an upper cover (600), the upper cover (600) being adapted to close off the opening.

9. The fire extinguishing apparatus according to claim 8, further comprising a second elastic member (700), wherein the second elastic member (700) is elastically abutted between the upper cover (600) and the blocking member (300).

10. The fire extinguishing apparatus according to claim 1, wherein the upper case (200) is provided with an air hole (230) communicating with the outside, and the fire extinguishing apparatus further comprises a hole plug (800) for blocking the air hole (230).

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