CN117497955A - Pressure relief fire-retardant device and battery pack - Google Patents

Abstract

The application discloses pressure release fire-retardant device and battery package belongs to battery technical field, and pressure release fire-retardant device includes: the inside of the shell is provided with a gas leakage channel which is arranged in a penetrating way; the pressure release component seals the air release channel and can be opened under preset air pressure; the fire-retarding components are arranged along the first direction, the fire-retarding components are provided with a plurality of exhaust channels, and air inlets and air outlets of the exhaust channels respectively penetrate through two sides of the fire-retarding components in the first direction; and the air outlets of the air exhaust channels of the front fire retarding assembly face to the air inlets of the air exhaust channels of the rear fire retarding assembly along the first direction in the two adjacent fire retarding assemblies. The opening and closing of the air release channel are regulated through the pressure release component, and the flow of the high-temperature air in the air release channel is regulated to control the air release speed of the high-temperature air; meanwhile, by arranging the staggered air inlet and air outlet, the flame in the high-temperature gas collides with the flame retardant assembly to be extinguished, so that the flame retardant effect is realized. Thus, the safe and reliable discharge of the high-temperature gas in the battery pack is realized.

Description

Pressure relief fire-retardant device and battery pack

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a pressure relief and fire retarding device and a battery pack.

Background

When the battery pack fails, flame and high-temperature gas are generated due to high pressure, and currently, a pressure release valve is used for pressure release and exhaust of the battery pack. In order to further quench the flame and cool the high temperature gas, a portion of the pressure relief valve is provided with a flame retardant plate and a wire mesh to isolate the spark from the cooling flame.

However, the residence time of the high-temperature gas in the fire-retardant plate and the wire mesh is short, the effect of quenching the flame is limited, and the safe and reliable discharge of the high-temperature gas in the battery pack cannot be realized.

Disclosure of Invention

The invention aims to: the pressure relief fire-retardant device is used for solving the problems that the retention time of high-temperature gas in a fire-retardant plate and a wire mesh is short, the effect of quenching flame is limited, and the safe and reliable discharge of the high-temperature gas in a battery pack cannot be realized; another object of the present application is to provide a battery pack comprising the pressure relief and fire retardant device.

Technical scheme, the application provides a pressure release fire-retardant device, pressure release fire-retardant device has a first direction, includes:

the shell is internally provided with a gas leakage channel which is arranged in a penetrating way along the first direction;

the pressure relief assembly and the fire retarding assembly are arranged in the air leakage channel along the first direction X; the pressure relief assembly seals the air relief channel and can be opened under preset air pressure; the fire-retarding assembly is provided with a plurality of fire-retarding assemblies, the fire-retarding assemblies are distributed along the first direction X, the fire-retarding assemblies are provided with a plurality of exhaust channels, the exhaust channels are provided with air inlets and air outlets along the first direction X, and the air inlets and the air outlets respectively penetrate through two sides of the fire-retarding assemblies in the first direction;

and the air outlets of the air exhaust channels of the front fire-retarding assembly face the air inlets of the air exhaust channels of the rear fire-retarding assembly along the first direction in two adjacent fire-retarding assemblies.

In some embodiments, the housing comprises:

a first housing and a second housing, the first housing and the second housing being connected along the first direction X;

the pressure relief assembly is arranged in the first shell, and the fire retarding assembly is arranged in the second shell; the pressure relief assembly seals an opening of the first housing toward the second housing and can be opened under the preset air pressure to communicate the first housing with the second housing to form the air relief channel.

In some embodiments, the second housing comprises:

the flow guiding part is connected with one side of the first shell, which faces the second shell;

the installation part is connected with one side of the diversion part, which is away from the first shell;

wherein the fire retardant component is arranged in the mounting part; when the pressure relief assembly is opened under the preset pressure, the flow guiding part is communicated with the first shell, so that gas enters the installation part through the flow guiding part.

In some embodiments, the flow guide has a dimension in a second direction, the dimension increasing in the first direction; the second direction intersects the first direction.

In some embodiments, the firestop assembly includes a plurality of exhaust pipes arranged radially of the bleed passage, the exhaust pipes having the exhaust passage.

In some embodiments, further comprising:

and the breathable film assembly is covered and sealed on one side of the second shell, which is away from the first shell.

In some embodiments, the vented membrane assembly comprises:

a breathable film;

the first sealing ring is arranged around the edge of the breathable film and is connected with the inner wall of the second shell;

the top cover is covered and sealed on one side of the first sealing ring, which is away from the second shell.

In some embodiments, the pressure relief assembly comprises:

the hollowed-out fixing seat is connected with the inner wall of the first shell;

rupture disk;

the hollow clamp is connected with the rupture disc and seals the air leakage channel;

the displacement assembly is connected with the hollow fixing seat and the hollow clamp holder;

the rupture disc and the hollow clamp holder move along the first direction under the preset air pressure so as to open the air leakage channel.

In some embodiments, the hollowed-out clamp includes:

the first hollowed-out clamping part and the second hollowed-out clamping part are arranged on two sides of the rupture disc along the first direction;

the second sealing ring is arranged between the first hollowed-out clamping part and the second hollowed-out clamping part, and surrounds the edge of the rupture disk, and the second sealing ring seals the air leakage channel.

In some embodiments, the displacement assembly comprises:

the fixing rod is connected with one side, facing the second shell, of the hollowed-out fixing seat, and a plurality of sliding blocks are arranged on the outer wall of the fixing rod;

the telescopic pipe is connected with one side of the hollowed-out clamp holder, which faces the hollowed-out fixing seat, and the telescopic pipe is sleeved on the fixing rod, a plurality of guide rails are arranged on the telescopic pipe, and the guide rails are matched with the sliding blocks;

the elastic piece is sleeved on the telescopic pipe, and two ends of the elastic piece are respectively connected with the hollowed-out fixing seat and the hollowed-out clamp holder.

Correspondingly, the application also provides a battery pack, which comprises:

the box body is provided with a pressure relief hole;

the pressure relief fire suppression device as recited in any one of the above embodiments, said pressure relief fire suppression device covering said pressure relief aperture.

The beneficial effects are that: compared with the prior art, the embodiment of the application provides a pressure release fire-retardant device, pressure release fire-retardant device has first direction, includes: the shell is internally provided with a gas leakage channel which is arranged in a penetrating way along the first direction; the pressure relief assembly and the fire retarding assembly are arranged in the air release channel along the first direction; the pressure relief assembly seals the air relief channel and can be opened under preset air pressure; the fire-retarding assembly is provided with a plurality of fire-retarding assemblies which are distributed along the first direction, the fire-retarding assembly is provided with a plurality of exhaust channels, the exhaust channels are provided with air inlets and air outlets along the first direction, and the air inlets and the air outlets respectively penetrate through two sides of the fire-retarding assembly in the first direction; and the air outlets of the air exhaust channels of the front fire retarding assembly face to the air inlets of the air exhaust channels of the rear fire retarding assembly along the first direction in the two adjacent fire retarding assemblies. According to the pressure relief device, the pressure relief assembly is used for adjusting the opening and closing of the air relief channel, so that the flow of high-temperature air in the air relief channel is adjusted, and the air relief speed of the high-temperature air is controlled; meanwhile, by arranging the staggered air inlet and air outlet, the flame in the high-temperature gas collides with the flame retardant assembly to be extinguished, so that the flame retardant effect is realized. Thus, the safe and reliable discharge of the high-temperature gas in the battery pack is realized.

It can be appreciated that compared with the prior art, the battery pack provided in the embodiment of the present application includes all technical features and technical effects of the pressure relief and fire retardation device, and is not described herein again.

Drawings

Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a first schematic structural diagram of a fire relief device according to an embodiment of the present disclosure;

fig. 2 is a second schematic structural diagram of the fire relief device according to the embodiment of the present application;

FIG. 3 is a first cross-sectional schematic view of A-A of FIG. 2;

FIG. 4 is a second cross-sectional schematic view of A-A of FIG. 2;

FIG. 5 is a schematic cross-sectional view of B-B of FIG. 2;

FIG. 6 is an enlarged partial schematic view of region C of FIG. 5;

fig. 7 is an exploded schematic view of a pressure relief fire retardant device according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of an explosion structure of a breathable film assembly in a fire release device according to an embodiment of the present disclosure;

fig. 9 is an exploded view of a pressure relief assembly in a pressure relief fire suppression device according to an embodiment of the present disclosure;

fig. 10 is a schematic structural view of a battery pack according to an embodiment of the present application.

Reference numerals: 100-a housing; 110-venting channels; 120-a first housing; 130-a second housing; 131-a deflector; 132-a mounting portion; 200-a pressure relief assembly; 210-hollowed-out fixing seat; 220-rupture disc; 230-hollowed-out clamp holder; 231-a first clamping portion; 232-a second clamping portion; 233-a second seal ring; 240-a displacement assembly; 241—a fixed rod; 242-slide block; 243-telescoping tubes; 244-guide rail; 245-an elastic member; 300-firestop assembly; 310-exhaust passage; 311-air inlet; 312-air outlet; 320-exhaust pipe; 400-a gas permeable membrane module; 410-breathable film; 420-a first sealing ring; 430-top cap; 500-box body; 510-a pressure relief hole; 600-discharging fire-retarding device; x-a first direction; y-second direction.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application.

When the battery pack fails, flame and high-temperature gas are generated due to high pressure, and currently, a pressure release valve is used for pressure release and exhaust of the battery pack. In order to further quench the flame and cool the high temperature gas, a portion of the pressure relief valve is provided with a flame retardant plate and a wire mesh to isolate the spark from the cooling flame. However, the residence time of the high-temperature gas in the fire-retardant plate and the wire mesh is short, the effect of quenching flame is limited, and the safe and reliable discharge of the high-temperature gas in the battery pack cannot be realized; meanwhile, the fire-retardant plate and the wire mesh have a strong blocking effect on high-temperature gas, and further influence the discharge rate of the high-temperature gas.

In view of this, an embodiment of the present application provides a pressure relief fire-retardant device, please refer to fig. 1, 2, 3, 4, 5 and 6, fig. 1 illustrates a first schematic structural diagram of the pressure relief fire-retardant device provided in the embodiment of the present application; FIG. 2 illustrates a second structural schematic view of a fire relief device provided in an embodiment of the present application; FIG. 3 illustrates a first cross-sectional view of A-A of FIG. 2; FIG. 4 illustrates a second cross-sectional view of A-A of FIG. 2; FIG. 5 illustrates a schematic cross-sectional view of B-B of FIG. 2; fig. 6 illustrates a partially enlarged schematic view of region C in fig. 5. The embodiment of the present application provides a venting fire-blocking device 600, including a housing 100, a venting assembly 200, and a fire-blocking assembly 300. Along the first direction X, a venting channel 110 is formed in the casing 100 and penetrates through the casing; pressure relief assembly 200 and firestop assembly 300 are arranged in vent path 110 along first direction X; the pressure relief assembly 200 seals the air relief channel 110 and can be opened under a preset air pressure; the fire-blocking assembly 300 is provided with a plurality of fire-blocking assemblies 300 which are arranged along a first direction X, the fire-blocking assembly 300 is provided with a plurality of air exhaust channels 310, the air exhaust channels 310 are provided with an air inlet 311 and an air outlet 312 along the first direction X, and the air inlet 311 and the air outlet 312 respectively penetrate through two sides of the fire-blocking assembly 300 in the first direction X; in the first direction X, the air outlets 312 of the air discharge passages 310 of the previous fire-blocking assembly 300 among the adjacent two fire-blocking assemblies 300 face the air inlets 311 of the plurality of air discharge passages 310 of the next fire-blocking assembly 300.

Specifically, the opening and closing of the air release channel 110 are adjusted through the pressure release assembly 200, so that the flow of the high-temperature air in the air release channel 110 is adjusted, and the air release speed of the high-temperature air passing through the air release channel 110 is controlled; meanwhile, by arranging staggered air inlets 311 and air outlets 312, the flame in the high-temperature gas needs to enter the air inlets 311 of a plurality of air exhaust channels 310 of the next fire-retarding assembly 300 respectively after coming out of the air outlets 312 of the air exhaust channels 310 of the previous fire-retarding assembly 300 along the first direction X, and the flame can strike the surfaces between the air inlets 311 of the plurality of air exhaust channels 310 of the next fire-retarding assembly 300 in the process, so that the flame is extinguished, and meanwhile, the temperature of the gas is reduced, so that the effect of fire retarding is realized. It will be appreciated that high temperature gases flowing through the plurality of firestop assemblies 300 will strike the firestop assemblies 300 in sequence until all fires are extinguished. Thus, the embodiment of the application ensures the discharge rate of the high-temperature gas while the fire is blocked by the cooperation of the pressure relief assembly 200 and the fire blocking assembly 300, and realizes the safe and reliable discharge of the high-temperature gas in the battery pack.

To further achieve safe and reliable discharge of high temperature gas, referring again to fig. 2, 3 and 4, in some embodiments, the housing 100 includes a first housing 120 and a second housing 130, the first housing 120 and the second housing 130 being connected along a first direction X; wherein, the pressure relief assembly 200 is disposed in the first housing 120, and the fire retardant assembly 300 is disposed in the second housing 130; the pressure relief assembly 200 seals the opening of the first housing 120 toward the second housing 130 and can be opened at a preset air pressure to communicate the first housing 120 and the second housing 130 to form the venting channel 110. The pressure relief assembly 200 is disposed in the first housing 120 for controlling the release of the high temperature gas. When the pressure of the high temperature gas exceeds the preset pressure, the pressure relief assembly 200 opens the gas release passage 110 to introduce the high temperature gas into the firestop assembly 300 for firestop. And after the high-temperature gas is discharged, the fire or explosion caused by sparks is avoided, and the safety of the battery pack is improved.

Specifically, when the high temperature gas does not enter the vent passage 110, the edge of the pressure relief assembly 200 contacts the inner wall of the first housing 120 to seal the vent passage 110. When the high temperature gas enters the air release channel 110, if the air pressure in the air release channel 110 is higher than the external ambient air pressure but lower than the action pressure of the pressure release assembly 200, the pressure release assembly 200 will move along the first direction X under the action of the pressure difference, so as to open the air release channel 110. As the pressure of the high temperature gas is gradually increased, the distance the pressure relief assembly 200 moves is gradually increased, and the opening of the vent passage 110 is gradually increased until the pressure relief assembly 200 moves to a maximum distance. At this time, if the pressure of the high temperature gas continues to increase, the pressure relief assembly 200 may burst, further rapidly discharging the high temperature gas.

To further optimize the discharge of the high temperature gas, referring again to fig. 2, 3 and 4, in some embodiments, the second housing 130 includes a flow guide 131 and a mounting 132. Wherein, the diversion part 131 is connected with one side of the first shell 120 facing the second shell 130; the mounting part 132 and the side of the guide part 131 facing away from the first housing 120 are connected; wherein, fire retardant assembly 300 is disposed within mounting portion 132; when the pressure relief assembly 200 is opened at a preset pressure, the flow guiding portion 131 communicates with the first housing 120, so that the gas enters the installation portion 132 through the flow guiding portion 131. Specifically, the flow guide portion 131 guides the high temperature gas, thereby controlling the gas pressure distribution before the high temperature gas enters the firestop assembly 300 and improving the reliability of the discharging firestop device 600.

To further enhance the guiding effect of the guiding portion 131, please refer to fig. 2, 3 and 4 again, in some embodiments, the guiding portion 131 has a dimension D mm along the second direction Y, and the dimension D mm increases along the first direction X; the second direction Y intersects the first direction X. Thus, along the first direction X, as the dimension D mm of the flow guiding portion 131 increases, the cross-sectional area of the air leakage channel 110 increases, the flow velocity of the high-temperature gas decreases greatly, the contact area between the high-temperature gas and the fire-retardant component 300 increases, and the fire-retardant effect of the fire-retardant component 300 on the high-temperature gas is further improved.

Referring again to fig. 5 and 6, in some embodiments, the firestop assembly 300 includes a plurality of exhaust pipes 320, the plurality of exhaust pipes 320 being arranged in a radial direction of the vent passage 110, the exhaust pipes 320 having an exhaust passage 310 therein. In another embodiment of the present application, a plurality of exhaust pipes 320 are arranged in parallel to form the fire-retardant assembly 300, and besides the exhaust channels 310 are provided in the exhaust pipes 320, additional exhaust channels are formed between the exhaust pipes 320, so that the space of the air release channel 110 in the second housing 130 is utilized to the maximum, and the discharge of high-temperature gas can be accelerated while the fire-retardant is realized.

Referring to fig. 7, fig. 7 illustrates an exploded structure of the pressure relief and fire-retardant device according to the embodiment of the present application; in some embodiments, the venting fire-blocking device 600 further comprises: the air permeable membrane assembly 400 covers the side of the second housing 130 facing away from the first housing 120. Breathable film assembly 400 can function to protect firestop assembly 300 from corrosion, gravel pack, etc., when no venting occurs. When the venting occurs, the ventilation membrane module 400 plays a role in ventilation, and at the same time, when the pressure of the high-temperature gas in the venting channel 110 reaches a certain level, the ventilation membrane module 400 automatically breaks to realize faster pressure relief and venting.

Referring to fig. 8, fig. 8 illustrates an exploded view of a ventilation membrane assembly in a fire venting device according to an embodiment of the present disclosure; in some embodiments, the vented membrane assembly 400 comprises: a gas permeable membrane 410, a first sealing ring 420, and a top cover 430. Wherein the first sealing ring 420 is disposed around the edge of the gas permeable membrane 410, and the first sealing ring 420 is connected with the inner wall of the second housing 130; the top cover 430 covers a side of the first sealing ring 420 facing away from the second housing 130. Specifically, the gas permeable membrane 410 may function to protect the firestop assembly 300 from corrosion, gravel blocking, etc., and the first seal ring 420 ensures a sealing effect between the gas permeable membrane 410 and the second housing 130, and the top cover 430 seals the gas permeable membrane 410 and the first seal ring 420 on the side of the second housing 130 facing away from the first housing 120. When the venting occurs, the venting membrane 410 plays a role of venting, and at the same time, when the pressure of the high-temperature gas in the venting channel 110 reaches a certain level, the venting membrane 410 automatically breaks to realize faster pressure relief and venting.

In order to further realize the flow control of the pressure release assembly 200 to the high-temperature gas, referring to fig. 9, fig. 9 illustrates an explosion structure schematic diagram of the pressure release assembly in the pressure release fire suppression device provided in the embodiment of the present application; in some embodiments, pressure relief assembly 200 includes a hollowed out anchor 210, a rupture disk 220, a hollowed out clamp 230, and a displacement assembly 240. The hollow fixing base 210 is connected with the inner wall of the first shell 120; the hollow holder 230 is connected with the rupture disk 220, and the hollow holder 230 seals the air leakage channel 110; the displacement assembly 240 connects the hollow fixing base 210 and the hollow clamp 230; wherein the rupture disk 220 and the hollow holder 230 move in the first direction X under a preset air pressure to open the venting channel 110. Specifically, the hollow fixing base 210 and the hollow holder 230 are used for realizing that high-temperature gas can pass through the hollow part while fixing the rupture disk 220 and the displacement assembly 240, so that the discharge of the high-temperature gas is prevented.

Referring to fig. 9 again, in some embodiments, the hollow holder 230 includes a first hollow holding portion 231, a second hollow holding portion 232, and a second sealing ring 233. The first hollowed clamping portion 231 and the second hollowed clamping portion 232 are disposed on two sides of the rupture disc 220 along the first direction X; the second sealing ring 233 is disposed between the first hollow clamping portion 231 and the second hollow clamping portion 232, and the second sealing ring 233 is disposed around the edge of the rupture disk 220, where the second sealing ring 233 seals the venting channel 110. In this way, the first hollow clamping part 231 and the second hollow clamping part 232 clamp the rupture disk 220, so that the stability of the rupture disk 220 during blasting is improved, the leakage channel 110 is prevented from being blocked during blasting of the rupture disk 220, and the discharge of high-temperature gas is influenced. When the high temperature gas does not enter the gas leakage path 110, the edge of the second sealing ring 233 contacts the inner wall of the first housing 120 to seal the gas leakage path 110.

Referring again to FIG. 9, in some embodiments, displacement assembly 240 includes a fixed rod 241, a telescoping tube 243, and a resilient member 245. The fixing rod 241 is connected to the hollow fixing base 210 towards one side of the second housing 130, and a plurality of sliding blocks 242 are arranged on the outer wall of the fixing rod 241; the telescopic tube 243 is connected with one side of the hollow holder 230 facing the hollow fixing seat 210, the telescopic tube 243 is sleeved on the fixing rod 241, a plurality of guide rails 244 are arranged on the telescopic tube 243, and the guide rails 244 are matched with the sliding blocks 242; the elastic member 245 is sleeved on the telescopic tube 243, and two ends of the elastic member 245 are respectively connected with the hollow fixing seat 210 and the hollow clamp 230.

Specifically, after the high temperature gas enters the air release passage 110, if the air pressure in the air release passage 110 is higher than the external air pressure but lower than the action pressure of the rupture disk 220, the rupture disk 220 will move along the first direction X under the action of the pressure difference, so as to open the air release passage 110. At this time, the elastic member 245 is stretched, and the guide rail 244 and the slider 242 are engaged, so that the telescopic tube 243 moves in the first direction X. As the pressure of the hot gas increases, the distance that the rupture disk 220 moves increases, and the opening of the vent passage 110 increases, until the rupture disk 220 moves to a maximum distance, i.e., the limit distance of relative movement of the slide 242 and the rail 244. At this time, if the pressure of the high temperature gas continues to increase, the rupture disk 220 may burst, further rapidly discharging the high temperature gas.

Correspondingly, the embodiment of the application also provides a battery pack. Referring to fig. 10, fig. 10 illustrates a schematic structure of a battery pack according to an embodiment of the present disclosure, where the battery pack includes: the box 500, the box 500 is provided with a pressure relief hole 510; the pressure relief fire stop device 600 according to any of the above embodiments, wherein the pressure relief fire stop device 600 covers the pressure relief hole 510. When high-temperature gas is generated in the case 500, the high-temperature gas enters the pressure relief fire relief device 600 through the pressure relief hole 510, and is safely and reliably discharged after pressure relief and fire relief of the pressure relief fire relief device 600.

The pressure relief and fire relief device and the battery pack provided by the embodiment of the application are described in detail, and specific examples are applied in the application to illustrate the principle and the implementation of the application, and the description of the above embodiments is only used for helping to understand the technical scheme and the core idea of the application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (11)

1. A pressure relief firestop device having a first direction (X), comprising:

a housing (100), wherein a gas leakage channel (110) is formed in the housing (100) along the first direction (X);

the pressure relief assembly (200) and the fire retardant assembly (300), wherein the pressure relief assembly (200) and the fire retardant assembly (300) are arranged in the air release channel (110) along the first direction (X); wherein the pressure relief assembly (200) seals the venting channel (110) and is openable at a preset pressure; the fire-retarding assembly (300) is provided with a plurality of fire-retarding assemblies (300) which are arranged along the first direction (X), the fire-retarding assembly (300) is provided with a plurality of exhaust channels (310), the exhaust channels (310) are provided with an air inlet (311) and an air outlet (312) along the first direction (X), and the air inlet (311) and the air outlet (312) respectively penetrate through two sides of the fire-retarding assembly (300) in the first direction (X);

wherein, in the first direction (X), the air outlets (312) of the air discharge passages (310) of the front one of the fire-retarding assemblies (300) are directed toward the air inlets (311) of the plurality of air discharge passages (310) of the rear one of the fire-retarding assemblies (300) in adjacent two of the fire-retarding assemblies (300).

2. The fire relief pressure reducing device according to claim 1, wherein the housing (100) comprises:

a first housing (120) and a second housing (130), the first housing (120) and the second housing (130) being connected along the first direction (X);

wherein the pressure relief assembly (200) is disposed within the first housing (120), and the firestop assembly (300) is disposed within the second housing (130); the pressure relief assembly (200) seals an opening of the first housing (120) toward the second housing (130) and is openable at the preset air pressure to communicate the first housing (120) and the second housing (130) to form the air relief passage (110).

3. The pressure relief and firestop device according to claim 2, wherein said second housing (130) comprises:

a flow guiding part (131), wherein the flow guiding part (131) is connected with one side of the first shell (120) towards the second shell (130);

a mounting part (132), wherein the mounting part (132) is connected with one side of the diversion part (131) away from the first shell (120);

wherein the firestop assembly (300) is disposed within the mounting portion (132); when the pressure relief assembly (200) is opened under the preset pressure, the flow guide part (131) is communicated with the first shell (120), so that gas enters the mounting part (132) through the flow guide part (131).

4. A pressure relief fire stop device according to claim 3, wherein the flow guide (131) has a dimension in the second direction (Y), the dimension increasing in the first direction (X); the second direction (Y) intersects the first direction (X).

5. The pressure relief fire prevention device according to claim 1, wherein said fire prevention assembly (300) comprises a plurality of exhaust pipes (320), a plurality of said exhaust pipes (320) being arranged in a radial direction of said venting channel (110), said exhaust pipes (320) having said venting channel (310).

6. The pressure relief and firestop device according to claim 2, further comprising:

and the ventilation membrane assembly (400) is covered on one side of the second shell (130) facing away from the first shell (120).

7. The pressure relief fire suppression apparatus according to claim 6, wherein said gas permeable membrane assembly (400) comprises:

a breathable film (410);

a first seal ring (420), the first seal ring (420) being disposed around an edge of the gas permeable membrane (410), and the first seal ring (420) being connected with an inner wall of the second housing (130);

and the top cover (430) is covered on one side of the first sealing ring (420) away from the second shell (130).

8. The pressure relief and firestop device according to claim 2, wherein said pressure relief assembly (200) comprises:

the hollow fixing seat (210) is connected with the inner wall of the first shell (120);

a rupture disk (220);

the hollowed-out clamp holder (230), the hollowed-out clamp holder (230) is connected with the rupture disc (220), and the hollowed-out clamp holder (230) seals the air leakage channel (110);

the displacement assembly (240) is connected with the hollowed-out fixing seat (210) and the hollowed-out clamp holder (230);

wherein the rupture disc (220) and the hollow holder (230) move in the first direction (X) under the preset air pressure to open the venting channel (110).

9. The fire venting device of claim 8, wherein the hollowed-out holder (230) comprises:

the first hollowed-out clamping part (231) and the second hollowed-out clamping part (232), and the first hollowed-out clamping part (231) and the second hollowed-out clamping part (232) are arranged on two sides of the rupture disc (220) along the first direction (X);

the second sealing ring (233), second sealing ring (233) set up in first fretwork clamping part (231) with between second fretwork clamping part (232), just second sealing ring (233) are around the edge setting of rupture disk (220), second sealing ring (233) is sealed gas leakage passageway (110).

10. The pressure relief fire suppression apparatus according to claim 9, wherein the displacement assembly (240) comprises:

the fixing rod (241), the fixing rod (241) is connected with one side of the hollowed-out fixing seat (210) towards the second shell (130), and a plurality of sliding blocks (242) are arranged on the outer wall of the fixing rod (241);

the telescopic tube (243), the telescopic tube (243) is connected with one side of the hollowed-out holder (230) towards the hollowed-out fixing seat (210), the telescopic tube (243) is sleeved on the fixing rod (241), a plurality of guide rails (244) are arranged on the telescopic tube (243), and the guide rails (244) are matched with the sliding blocks (242);

the elastic piece (245), elastic piece (245) cover is located on flexible pipe (243), just the both ends of elastic piece (245) are connected respectively fretwork fixing base (210) with fretwork holder (230).

11. A battery pack, comprising:

the box body (500), the box body (500) is provided with a pressure relief hole (510);

the pressure relief fire relief device of any one of claims 1-10, which covers the pressure relief aperture (510).