WO2023083275A1

WO2023083275A1 - Fire extinguishing box and lower battery pack housing

Info

Publication number: WO2023083275A1
Application number: PCT/CN2022/131232
Authority: WO
Inventors: 曹永强; 梁宏伟; 刘崇威; 李岩
Original assignee: 长城汽车股份有限公司
Priority date: 2021-11-12
Filing date: 2022-11-10
Publication date: 2023-05-19
Also published as: CN115282527A

Abstract

A fire extinguishing box (100) and a lower battery pack housing (1000). The fire extinguishing box (100) comprises: a first barrier net assembly (10) provided with a first through hole (111); a second barrier net assembly (20), wherein a first isolation cavity (23) is formed between the second barrier net assembly (20) and the first barrier net assembly (10), and the second barrier net assembly (20) is provided with a second through hole (211); and an explosion-proof valve (30), a second isolation cavity (31) being formed between the explosion-proof valve (30) and the second barrier net assembly (20).

Description

Fire extinguishing box and battery pack lower box

Cross References to Related Applications

This application claims priority to a Chinese patent application with application number 202111337771.6 entitled "Fire Extinguishing Box and Lower Box for Battery Pack" filed with the State Intellectual Property Office of China on November 12, 2021, the entire contents of which are hereby incorporated by reference In this application.

technical field

The present disclosure relates to the technical field of batteries, in particular to a fire extinguishing box and a battery pack lower box.

Background technique

With the country's planning and support for the development of the new energy vehicle industry, electric vehicles are becoming more and more popular, but at the same time, many terminal experience problems have arisen, such as thermal runaway of batteries. How to solve the impact of battery thermal runaway on electric vehicles has become a top priority in the development of electric vehicles.

In related technologies, when the battery is thermally out of control, high energy is generated instantly inside the battery, accompanied by the combustion of high-temperature gas and solid particle ejecta, which can easily cause an explosion inside the battery, thereby reducing the safety of the battery and electric vehicles. sex. In other electric vehicles, there is an explosion-proof device to prevent the high-temperature and high-pressure smoke or fire explosion caused by the thermal runaway of the battery, but the explosion-proof effect of the traditional explosion-proof device is unstable, which will reduce the reliability of the electric vehicle.

Contents of the invention

The present disclosure aims to solve at least one of the technical problems existing in the prior art. For this reason, the present disclosure proposes a fire extinguishing box, which has a stable and reliable structure. When the battery is thermally out of control, it can quickly and effectively perform exhaust and pressure relief, and can extinguish fire and cool down to prevent fire in the lower box of the battery pack.

The present disclosure also proposes a battery pack lower case.

The fire extinguishing box according to an embodiment of the present disclosure includes: a first barrier net component, a first through hole is opened on the first barrier net component; a second barrier net component, the second barrier net component and the first barrier net component A first isolation cavity is formed between the barrier net components, and a second through hole is opened on the second barrier net component; an explosion-proof valve, a second isolation cavity is formed between the explosion-proof valve and the second barrier net component .

Thus, the first barrier net assembly, the second barrier net component and the explosion-proof valve can jointly block the eruption and reduce the temperature and impact velocity of the eruption in the lower box of the battery pack, and extinguish the burning flame in the continuously erupting air stream, Thereby, the reliability of the fire extinguishing box can be improved.

According to some embodiments of the present disclosure, the first blocking net assembly includes: a first blocking net and a first mounting part, the first mounting part is provided with an avoidance hole, and the first blocking net is arranged in the avoidance hole , the first through hole is opened on the first barrier net.

According to some embodiments of the present disclosure, a plurality of the first through holes are opened on the first barrier net, and the plurality of the first through holes are distributed in a manner of radiating from the center to the surroundings, and the plurality of the first through holes The air outlet area of the hole shows an increasing trend.

According to some embodiments of the present disclosure, the first barrier net is circular or polygonal, and the plurality of first through holes are distributed in a cobweb pattern as a whole.

According to some embodiments of the present disclosure, the first barrier net and the first mounting part are integrally formed structural members; or the first barrier net is embedded, bonded or welded on the first mounting part .

According to some embodiments of the present disclosure, the fire extinguishing box further includes a gasket, the gasket is arranged between the first mounting part and the second barrier net assembly, the gasket is provided with perforations, and the gasket is provided with perforations. The first mounting part is provided with a limiting protrusion, and the limiting protrusion fits in the through hole.

According to some embodiments of the present disclosure, the second barrier net assembly includes a second barrier net and a second mounting part, the second barrier net is disposed on the second mounting part, and the explosion-proof valve is disposed on the first In the second mounting part, the second through hole is opened on the second barrier net.

According to some embodiments of the present disclosure, the second mounting part includes a first plate portion, a second plate portion, a connecting portion and a recessed portion, the connecting portion is connected to the first plate portion and the second plate portion , the second plate portion protrudes toward the explosion-proof valve, the recessed portion is disposed on the second plate portion and is recessed toward a direction away from the explosion-proof valve, and the second barrier net is disposed in the depression part and jointly define the second isolation cavity with the explosion-proof valve.

According to some embodiments of the present disclosure, both the first blocking net and the second blocking net are made of stainless steel.

According to some embodiments of the present disclosure, the second barrier net component is disposed on one side of the first barrier net component, and a plurality of second through holes are opened on the second barrier net component, and a plurality of the second through holes are formed on the second barrier net component. The first through hole and the plurality of second through holes are arranged opposite to each other, and the plurality of second through holes are distributed at uniform intervals on the second blocking net assembly.

According to some embodiments of the present disclosure, the explosion-proof valve is disposed on the second barrier net assembly and opposite to the plurality of second through holes.

According to some embodiments of the present disclosure, the total area of the plurality of second through holes is larger than the total area of the plurality of first through holes.

The battery pack lower box according to an embodiment of the present disclosure includes: an outer frame, the outer frame is used to accommodate the battery module, and the outer frame is provided with an exhaust channel; and the above-mentioned fire extinguishing box, the fire extinguishing box It is arranged on the outer frame and communicated with the exhaust passage.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, in which:

FIG. 1 is a partial schematic diagram of a lower case of a battery pack according to an embodiment of the present disclosure;

2 is a schematic diagram of a fire extinguishing box according to an embodiment of the present disclosure;

3 is an exploded view of a fire extinguishing box according to an embodiment of the present disclosure;

4 is a schematic diagram of a second barrier mesh assembly according to an embodiment of the present disclosure;

5 is a schematic diagram of a first barrier mesh assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a first barrier mesh assembly according to another embodiment of the present disclosure.

Reference signs:

1000-battery pack lower box; 100-fire extinguishing box; 10-first barrier net assembly; 11-first barrier net; 111-first through hole; 12-first mounting piece; 121-avoidance hole; Bit protrusion; 20-second barrier net assembly; 21-second barrier net; 211-second through hole; 22-second mounting piece; 221-first board part; 222-second board part; 223-connection 224-recessed part; 23-first isolation cavity; 30-explosion-proof valve; 31-second isolation cavity; 40-sealing gasket; 41-perforation; 200-outer frame.

Detailed ways

The embodiments described with reference to the drawings are exemplary, and the embodiments of the present disclosure will be described in detail below.

The following describes a fire extinguishing box 100 according to an embodiment of the present disclosure with reference to FIGS. 1-6 . The fire extinguishing box 100 can be applied to the lower case 1000 of a battery pack.

As shown in FIG. 2 and FIG. 3 , the fire extinguishing box 100 according to the embodiment of the present disclosure may mainly include: a first barrier net assembly 10 , a second barrier net component 20 and an explosion-proof valve 30 . Wherein, the first barrier net assembly 10 is provided with a first through hole 111, the second barrier net component 20 is arranged on the first barrier net component 10, and a second barrier net component 20 and the first barrier net component 10 are formed between the second barrier net component 20 and the first barrier net component 10. An isolation cavity 23 . A second through hole 211 is opened on the second barrier net assembly 20 , the explosion-proof valve 30 is disposed on the second barrier net component 20 , and a second isolation cavity 31 is formed between the explosion-proof valve 30 and the second barrier net component 20 . Specifically, the first blocking net assembly 10 can effectively block the eruption, reduce the temperature and impact velocity of the eruption, and extinguish the burning flame in the continuously erupting air stream. Since the second barrier net assembly 20 is arranged on the first barrier net component 10, and the first isolation chamber 23 is formed between the second barrier net component 20 and the first barrier net component 10, when the first barrier net component 10 plays an effective After blocking the eruption and effectively reducing the temperature and impact velocity of the eruption, there will still be eruption rushing through the first through hole 111 to enter the first isolation cavity 23 . In some embodiments, the temperature and speed of the eruption entering the first isolation chamber 23 will gradually decrease until the eruption disappears during the forward impact. In some other embodiments, the temperature and velocity of the eruptions entering the first isolation cavity 23 will gradually decrease during the forward impact process, but some eruptions will still impact the second barrier net assembly 20, and the second The barrier net assembly 20 can perform a secondary blocking effect on the eruption, thereby further blocking the eruption and reducing the temperature and impact velocity of the eruption, and extinguishing the flames burning in the continuously erupting air stream.

After the second extinguishment by the second barrier net assembly 20 , some eruptions will still enter the second isolation chamber 31 through the second through hole 211 . The speed and temperature of the eruption in the second isolation chamber 31 will be further reduced as the impact continues forward, thereby preventing the temperature and pressure of the eruption flowing from the explosion-proof valve 30 to the external environment from being too high, causing the eruption to enter the outside Explosion occurs in the environment, causing a safety accident. In this way, the structure, safety and stability of the fire extinguishing box 100 can be improved.

Through the layer-by-layer blocking of the eruption by the first barrier net assembly 10, the second barrier net assembly 20 and the explosion-proof valve 30, compared with the traditional fire extinguishing box, which only blocks the eruption once, this can further prevent the eruption from extinguishing the fire. The spray out from the fire extinguishing box 100, or can reduce the temperature and pressure when the eruption flows out of the fire extinguishing box 100, so that the reliability of the fire extinguishing box 100 can be further improved.

In addition, the first through hole 111 and the second through hole 211 can block the eruption and reduce the temperature and impact velocity of the eruption, while extinguishing the burning flame in the continuously erupting air stream, the eruption can pass smoothly, which can prevent The first blocking net assembly 10 and the second blocking net assembly 20 completely block the eruption, causing the eruption to be blocked inside, thereby preventing the temperature and air pressure from further increasing and causing the explosion of the eruption. This can further improve the stability and reliability of the first screen assembly 10 and the second screen assembly 20.

Thus, by setting the second barrier net assembly 20 on the first barrier net assembly 10, and making the explosion-proof valve 30 be arranged on the second barrier net component 20, the first barrier net assembly 10, the second barrier net assembly 20 and the The explosion-proof valve 30 jointly blocks and reduces the temperature and impact velocity of the eruptions in the lower box 1000 of the battery pack, and extinguishes the flames burning in the continuously erupting air stream, thereby improving the reliability of the lower box 1000 of the battery pack.

As shown in Figure 2, Figure 3, Figure 5 and Figure 6, the first barrier net assembly 10 can mainly include the first barrier net 11 and the first mounting part 12, the first mounting part 12 is provided with an escape hole 121, the first barrier The net 11 is disposed in the avoidance hole 121 , and the first through hole 111 is opened on the first blocking net 11 . Specifically, by opening the avoidance hole 121 on the first mounting part 12, and installing the first barrier net 11 in the avoidance hole 121, not only can the first barrier net 11 be stably and firmly installed on the first mounting part 12, but also The length of the fire extinguishing box 100 can be shortened to a certain extent, making the structure of the fire extinguishing box 100 more compact.

In addition, by opening the first through hole 111 on the first barrier net 11, not only can the first through hole 111 make full use of the space on the first barrier net 11, but also the speed of the first through hole 111 can be compared with the sprayed matter. The temperature effectively reduces the effect, thereby further improving the stability and reliability of the first through hole 111 .

As shown in Fig. 2, Fig. 3, Fig. 5 and Fig. 6, a plurality of first through holes 111 are opened on the first barrier net 11, and the plurality of first through holes 111 are distributed in a manner of radiating from the center to the surroundings, and the first through holes 111 The air outlet area of a through hole 111 is increasing gradually. Specifically, distributing the plurality of first through holes 111 in such a way as to radiate from the center to the surroundings, and making the air outlet area of the plurality of first through holes 111 increase in the direction extending from the center in the radial direction, can make The plurality of first through holes 111 are arranged in conformity with the shape of the first barrier net 11, so that the intervals between the plurality of first through holes 111 are smaller, and the plurality of first through holes 111 are more compact as a whole, so that the first barrier net 11 can be improved. The net 11 has a reducing effect on the velocity and temperature of the eruption.

As shown in FIG. 2 , FIG. 3 , FIG. 5 and FIG. 6 , the first barrier net 11 is circular or polygonal, and the plurality of first through holes 111 are distributed in a cobweb pattern as a whole. Specifically, setting the first barrier net 11 in a circular or polygonal shape can increase the shape of the first barrier net 11, so that the shape of the first barrier net 11 can be selectively set according to specific process requirements, which can improve the first barrier net 11. The applicability of the barrier net 11.

Furthermore, distributing the first through holes 111 as a whole in a spider web can not only improve the stability and reliability of the first through holes 111 on the first barrier net 11, but also make the first through holes 111 The setting is more uniform, so that the effect of reducing the temperature and velocity of the eruption by the plurality of first through holes 111 can be further improved.

In addition, such arrangement can also make the area of the first through holes 111 itself relatively large on the premise of stably and reliably reducing the temperature and speed of the eruption, so that the eruption can be Flowing more smoothly from the first through hole 111 to the second barrier net assembly 20 can prevent the eruption from being blocked inside by the first through hole 111 , thereby preventing the internal temperature and pressure from continuously rising and causing an explosion. In this way, the reliability of the first through hole 111 can be further improved.

In some embodiments, the first barrier net 11 and the first mounting part 12 are integrally formed structural members, which can not only improve the stability and firmness of the first barrier net 11 disposed on the first mounting part 12, but also can The manufacturing process of the fire extinguishing box 100 is simplified.

In some other embodiments, the first barrier net 11 is embedded, glued or welded on the first installation part 12 . In this way, under the premise of ensuring that the first blocking net 11 is stably and firmly arranged on the first mounting part 12, it is convenient to disassemble the first blocking net 11 from the first mounting part 12. In other words, when the structure of the first mounting part 12 or the first barrier net 11 is damaged, it is only necessary to disassemble the first barrier net 11 from the first mounting part 12 and repair and replace the damaged parts. In this way, the stability and reliability of the first barrier net assembly 10 can be improved.

Further, the connection manner between the first barrier net 11 and the first mounting part 12 can be selectively set according to specific process requirements. In this way, the production of the first blocking net assembly 10 can be facilitated, and the applicability of the first blocking net assembly 10 can be improved.

As shown in FIG. 2 and FIG. 3 , the fire extinguishing box 100 may further include a gasket 40 , and the gasket 40 is disposed between the first installation part 12 and the second barrier net assembly 20 . Specifically, due to limitations in technology and materials, gaps will inevitably appear at the connection between the first mounting part 12 and the second blocking net assembly 20, and through the gap between the first mounting part 12 and the second blocking net assembly 20 The gasket 40 is provided so that the gasket 40 can seal the gap between the first installation part 12 and the second barrier net assembly 20, and can prevent the eruption from entering the first isolation chamber 23 from the first installation part 12 and the second barrier net assembly. The spray is sprayed from the gap at the joint between the two barrier net components 20, which can improve the circumferential sealing performance and structural reliability of the fire extinguishing box 100.

Further, as shown in FIG. 2 and FIG. 3 , the sealing gasket 40 is provided with a perforation 41 , and the first installation part 12 is provided with a limiting protrusion 122 , and the limiting protrusion 122 fits in the through hole 41 . Specifically, when the sealing gasket 40 is installed between the first mounting part 12 and the second blocking mesh assembly 20 (for example, the second blocking mesh 21 in the second blocking mesh assembly 20), the sealing gasket 40 can be directly The through hole 41 is in limited fit with the limiting protrusion 122 on the first mounting member 12 . The limit cooperation between the perforation 41 and the limit protrusion 122 can not only prevent the gasket 40 from moving between the first mounting part 12 and the second barrier net assembly 20, but also play a positioning role, that is, only need to place the limit protrusion 122 protrudes into the through hole 41 , so that the sealing gasket 40 can be in a relatively correct position between the first mounting part 12 and the second blocking net assembly 20 . In this way, the installation of the sealing gasket 40 can be facilitated, and the efficiency of normal assembly of the fire extinguishing box 100 can be improved.

In addition, the sealing gasket 40, the first installation part 12 and the second barrier net 21 can be connected and fixed by fasteners. In this way, the stability and firmness of the connection and fixation of the sealing gasket 40 and the second barrier net 21 on the first mounting part 12 can be improved, and the mutual disassembly of the sealing gasket 40 , the first mounting part 12 and the second barrier net 21 can also be facilitated. Wherein, the fastener may be a bolt.

2-4, the second barrier net assembly 20 can mainly include a second barrier net 21 and a second mounting part 22, the second barrier net 21 is set on the second mounting part 22, and the explosion-proof valve 30 is set on the second The mounting part 22 is provided with a second through hole 211 on the second barrier net 21 . Specifically, after the second barrier net 21 is arranged on the second mounting part 22, the second mounting part 22 can be connected and fixed with the first mounting part 12, so that the second through hole on the second barrier net 21 can be 211 has a secondary reduction effect on the temperature and velocity of the eruption flowing from the first through hole 111 to the first isolation cavity 23 , which can further improve the structural reliability of the fire extinguisher box 100 .

Further, disposing the explosion-proof valve 30 on the second mounting part 22 can not only make the structure of the fire extinguishing box 100 more compact and reduce the volume of the fire extinguishing box 100, but also make the explosion-proof valve 30 directly opposite to the second barrier net 21. The eruption flowing out of the second through hole 211 is further blocked, which can further improve the stability and reliability of the explosion-proof valve 30 structure.

Wherein, the first barrier net 11 and the second barrier net 21 may be made of stainless steel or other high-strength high-temperature-resistant materials, which are not limited here.

As shown in FIG. 2-FIG. 4 , a plurality of second through holes 211 are opened on the second barrier net 21 , and the plurality of second through holes 211 are distributed on the second barrier net 21 at even intervals. In this way, when the second barrier net 21 blocks the eruption and reduces the temperature and speed of the eruption, the second through holes 211 arranged at even intervals on the second barrier net 21 can block the eruption more uniformly and stably. eruption. Further, since the eruption passes through the second through hole 211 after being blocked by the first through hole 111, the size of the foreign matter in the eruption will be smaller after being blocked by the first through hole 111. , so the diameter of the second through hole 211 is set to be smaller than the diameter of the first through hole 111 . In this way, the blocking effect of the second through hole 211 on the eruption can be improved under the premise of ensuring that the eruption is not blocked, which can further improve the reliability of the second through hole 211 .

In addition, the total area of the plurality of second through holes 211 is greater than the total area of the plurality of first through holes 111 . This can prevent the eruption from forming a local pressure difference in the fire extinguisher box 100 , causing failure of the fire extinguisher box 100 , thereby further improving the reliability of the fire extinguisher box 100 .

As shown in FIGS. 2-4 , the second mounting part 22 may mainly include a first plate portion 221 , a second plate portion 222 , a connecting portion 223 and a recessed portion 224 . The connecting portion 223 is connected to the first plate portion 221 and the second plate portion 222 , and the second plate portion 222 is protruded toward the explosion-proof valve 30 . The recessed portion 224 is disposed on the second plate portion 222 and is recessed toward a direction away from the explosion-proof valve 30 . The second barrier net 21 is disposed on the recessed portion 224 and defines the second isolation chamber 31 together with the explosion-proof valve 30 . Specifically, the connection part 223 is connected between the first board part 221 and the second board part 222, so that there is a certain distance between the second board part 222 and the first mounting part 12, that is, the second mounting part 22, there is a first isolation cavity 23 open to the first mounting part 12, so that not only the structural reliability of the second mounting part 22 can be improved, but also the structure of the first isolation cavity 23 can be simplified, and the first isolation cavity can be improved. 23 reliability.

Further, by setting the recessed portion 224 on the second plate portion 222 that is recessed toward the direction away from the explosion-proof valve 30, after the second barrier net 21 is arranged in the recessed portion 224, the second barrier net 21 and the explosion-proof valve 30 can be made to work together. A second isolation chamber 31 is defined. In this way, not only the original structure of the second mounting part 22 can be fully utilized to open the second isolation chamber 31, but the structural design of the second mounting part 22 can also be simplified, and the second isolation chamber 31 can also act against the high-temperature and high-pressure eruptions. A more stable and reliable buffering of the turbulence effect can be achieved, thereby improving the reliability of the second isolation cavity 31 .

As shown in FIG. 1 , the battery pack lower case 1000 according to an embodiment of the present disclosure may mainly include an outer frame 200 and the above-mentioned fire extinguishing box 100 . Wherein, the outer frame 200 is used for accommodating the battery module, and the outer frame 200 is provided with an exhaust channel, and the fire extinguishing box 100 is arranged on the outer frame 200 and communicated with the exhaust channel. Specifically, when thermal runaway occurs in the battery module and high-temperature and high-pressure eruptions are generated, the eruptions can be discharged through the exhaust passage on the outer frame 200; the fire extinguishing box 100 is arranged on the outer frame 200 and the fire extinguishing box 100 It is connected with the exhaust passage, and the exhaust passage can guide the high-temperature and high-pressure eruption to the fire extinguishing box 100. The fire extinguishing box 100 can effectively block and reduce the temperature and impact velocity of the high-temperature and high-pressure eruption, and extinguish the continuously erupting fire. The flame burning in the airflow can prevent the high-temperature and high-pressure eruption from exploding in the process of being discharged to the external environment, which can improve the structural reliability of the battery pack lower box 1000 .

In describing the present disclosure, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "inner", "outer", "circumferential" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation are therefore not to be construed as limitations on the present disclosure.

In the description of this specification, references to the terms "one embodiment," "some embodiments," "exemplary embodiments," "example," "specific examples," or "some examples" are intended to mean that the implementation A specific feature, structure, material, or characteristic described by an embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

Although the embodiments of the present disclosure have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

A fire extinguishing box (100), which is used to be installed on the battery pack lower box (1000) of a vehicle, is characterized in that it comprises:

A first barrier net component (10), where a first through hole (111) is opened on the first barrier net component (10);

A second barrier net component (20), a first isolation cavity (23) is formed between the second barrier net component (20) and the first barrier net component (10), and the second barrier net component ( 20) A second through hole (211) is opened on the top;

An explosion-proof valve (30), a second isolation chamber (31) is formed between the explosion-proof valve (30) and the second barrier net assembly (20).
The fire extinguishing box (100) according to claim 1, characterized in that, the first blocking net assembly (10) comprises a first blocking net (11) and a first mounting part (12), and the first mounting part (12) An avoidance hole (121) is provided, the first barrier net (11) is arranged in the avoidance hole (121), and the first through hole (111) is opened on the first barrier net (11) ).
The fire extinguishing box (100) according to claim 2, characterized in that, the first barrier net (11) is provided with a plurality of first through holes (111), and a plurality of first through holes ( 111) Distributed in a manner of radiating from the center to the surroundings, and the air outlet areas of the plurality of first through holes (111) show an increasing trend.
The fire extinguishing box (100) according to claim 3, characterized in that, the first barrier net (11) is circular or polygonal, and the plurality of first through holes (111) are distributed in a cobweb pattern as a whole.
The fire extinguishing box (100) according to any one of claims 2-4, characterized in that, the first barrier net (11) and the first mounting part (12) are integrally formed structural members; or

The first blocking net (11) is embedded, glued or welded on the first mounting part (12).
The fire extinguishing box (100) according to any one of claims 2-5, further comprising a gasket (40), the gasket (40) being arranged on the first mounting part (12) and Between the second barrier net assembly (20), the sealing gasket (40) is provided with a perforation (41), and the first installation part (12) is provided with a limiting protrusion (122), and the limiting protrusion The riser (122) fits in the through hole (41).
The fire extinguishing box (100) according to any one of claims 2-6, characterized in that, the second blocking net assembly (20) comprises a second blocking net (21) and a second mounting part (22), The second barrier net (21) is arranged on the second installation part (22), the explosion-proof valve (30) is arranged on the second installation part (22), and the second barrier net (21) The second through hole (211) is opened.
The fire extinguishing box (100) according to claim 7, characterized in that, the second mounting part (22) comprises a first plate part (221), a second plate part (222), a connecting part (223) and a depression part (224), the connecting part (223) is connected to the first plate part (221) and the second plate part (222), and the second plate part (222) faces the explosion-proof valve (30 ) protrudingly arranged, the recessed part (224) is arranged on the second plate part (222) and is recessed toward the direction away from the explosion-proof valve (30), and the second barrier net (21) is arranged on the The recessed part (224) together with the explosion-proof valve (30) defines the second isolation cavity (31).
The fire extinguishing box (100) according to claim 7 or 8, characterized in that, both the first blocking net (11) and the second blocking net (21) are made of stainless steel.
The fire extinguishing box (100) according to claim 3 or 4, characterized in that, the second barrier net assembly (20) is arranged on one side of the first barrier net component (10), and the second barrier net A plurality of said second through holes (211) are opened on the mesh assembly (20), a plurality of said first through holes (111) and a plurality of said second through holes (211) are arranged oppositely, a plurality of said The second through holes (211) are distributed at uniform intervals on the second blocking net assembly (20).
The fire extinguishing box (100) according to claim 10, characterized in that, the explosion-proof valve (30) is arranged on the second barrier net assembly (20) and is opposite to the plurality of second through holes (211) set up.
The fire extinguishing box (100) according to claim 10 or 11, characterized in that the total area of the plurality of second through holes (211) is greater than the total area of the plurality of first through holes (111).
A battery pack lower case (1000), characterized in that it comprises:

An outer frame (200), the outer frame (200) is used to accommodate the battery module, and the outer frame (200) is provided with an exhaust channel; and

The fire extinguishing box (100) according to any one of claims 1-12, the fire extinguishing box (100) is arranged on the outer frame (200) and communicated with the exhaust passage.