Battery thermal runaway ejecta capture device

Abstract

The present invention relates to a device for capturing ejecta from a battery thermal runaway. The device comprises a reaction vessel, a first housing, a second housing, and a solid-phase capture element. The reaction vessel comprises a mounting cavity. The first housing is accommodated in the mounting cavity and comprises a capture cavity, the wall of which is provided with a first pressure relief valve. The second housing is accommodated in the capture cavity and comprises a receiving cavity, the wall of which is provided with a second pressure relief valve. The solid-phase capture element is mounted on the wall of the receiving cavity and is used to capture the solid phase in the ejecta. The solid-phase capture element in the second housing captures large particles in the ejecta. Small particles flow through the second pressure relief valve into the first housing along with the gas phase in the ejecta, and are partially deposited on the wall of the capture cavity. The remaining fine particles flow through the first pressure relief valve into the reaction vessel along with the gas phase in the ejecta, and are deposited on the wall of the mounting cavity, thereby achieving complete capture and separation of the solid phase of the battery ejecta.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a device for capturing ejecta emitted during thermal runaway of a battery. Background Art

[0002] Lithium-ion batteries can experience thermal runaway under mechanical, thermal, or electrical abuse. This manifests as a violent chain reaction within the battery, which emanates a large amount of high-temperature particulate matter and gaseous multiphases from the safety valve, releasing significant amounts of heat. By collecting the gaseous and solid products produced during thermal runaway and performing both online and offline testing, we can understand the hazards of these products, and thus the type and extent of these hazards. This is crucial for the safe use, transportation, and storage of lithium-ion batteries, and in particular, provides a theoretical basis for handling accidents and minimizing human and property losses following thermal runaway. However, current capture equipment is unable to capture the fine particles in the erupted material, thus compromising the accuracy of the composition of the erupted material. Summary of the Invention

[0003] Based on this, it is necessary to provide a battery thermal runaway ejecta capture device to address the technical problem that existing capture equipment is unable to capture fine particles in the ejecta during battery thermal runaway, which affects the accuracy of judging the composition of the ejecta.

[0004] A battery thermal runaway ejecta capture device, comprising:

[0005] a reaction vessel having a mounting cavity;

[0006] A first box body is accommodated in the installation cavity, the first box body has a capture cavity, and a first pressure relief valve is provided on the cavity wall of the capture cavity;

[0007] a second box body, which is accommodated in the capture chamber, and has a receiving chamber, wherein the receiving chamber has a preset position for installing the battery, and a second pressure relief valve is provided on the wall of the receiving chamber; and

[0008] A solid phase capture component is installed on the cavity wall of the accommodating cavity and is located on one side of the preset position. The solid phase capture component is used to capture the solid phase in the ejected material.

[0009] In one embodiment, the solid phase capture element includes at least two layers of first capture nets spaced apart from each other, the first capture nets are connected to the cavity wall of the accommodating cavity, and the aperture of each mesh of the first capture net decreases successively in the direction away from the preset position.

[0010] In one embodiment, the battery thermal runaway ejecta capture device includes a second capture net, which is located on the side of the solid phase capture component close to the preset position. The aperture of the second capture net is larger than the aperture of each of the first capture nets, and the second capture net is used to capture the battery debris.

[0011] In one embodiment, each of the first capture nets is used to face the safety valve of the battery installed at the preset position.

[0012] In one embodiment, the second pressure relief valve is located in an area close to the preset position.

[0013] In one embodiment, the axes of the first pressure relief valve and the second pressure relief valve coincide with each other.

[0014] In one embodiment, the battery thermal runaway ejecta capture device further includes a clamp, which is installed at the preset position and is used to clamp the battery.

[0015] In one embodiment, the battery thermal runaway ejecta capture device further includes a runaway trigger component, which is mounted on the fixture and is used to trigger the battery thermal runaway.

[0016] In one embodiment, the battery thermal runaway ejecta capture device further comprises:

[0017] a temperature sensor suspended in the mounting cavity; and / or,

[0018] A pressure sensor is installed in the reaction container, and a probe of the pressure sensor extends into the installation cavity.

[0019] In one embodiment, the battery thermal runaway ejecta capture device further includes a fitting and a gas collection bag. The cavity wall of the mounting cavity is provided with a connecting hole. The fitting is installed in the connecting hole to control the opening and closing of the connecting hole. The gas collection bag is used to communicate with the connecting hole to collect gas in the ejecta.

[0020] Beneficial effects:

[0021] An embodiment of the present invention provides a battery thermal runaway ejecta capture device, which includes a reaction vessel, a first box body, a second box body, and a solid-phase capture member; the reaction vessel has an installation cavity; the first box body is accommodated in the installation cavity, the first box body has a capture cavity, and a first pressure relief valve is provided on the cavity wall of the capture cavity; the second box body is accommodated in the capture cavity, the second box body has a accommodating cavity, the accommodating cavity has a preset position for battery installation, and a second pressure relief valve is provided on the cavity wall of the accommodating cavity; the solid-phase capture member is installed on the cavity wall of the accommodating cavity and is located on one side of the preset position, and the solid-phase capture member is used to capture the solid phase in the ejecta. In the present application, the battery undergoes thermal runaway in the second box, and the solid phase capture component in the second box captures large-sized particles in the ejecta, and small-sized particles enter the first box along with the gas phase in the ejecta through the second pressure relief valve, and are partially deposited on the cavity wall of the capture cavity and the outer wall of the second box. The remaining fine-sized particles enter the reaction vessel along with the gas phase in the ejecta through the first pressure relief valve, and are deposited on the cavity wall of the installation cavity and the outer wall of the first box, thereby achieving complete capture and separation of the solid phase of the battery ejecta, thereby improving the accuracy and convenience of judging the composition of the ejecta. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a battery thermal runaway ejecta capture device provided by one embodiment of the present invention.

[0023] Figure 2 A schematic diagram of a battery thermal runaway ejecta capture device provided by one embodiment of the present invention.

[0024] Figure 3 A cross-sectional view of the second box in a battery thermal runaway ejecta capture device provided in one embodiment of the present invention.

[0025] Figure 4 A schematic diagram of the first box in a battery thermal runaway ejecta capture device provided in one embodiment of the present invention.

[0026] Figure 5 A cross-sectional view of the first box in a battery thermal runaway ejecta capture device provided in one embodiment of the present invention.

[0027] Figure 6 This is a front view of the battery and the clamp in the battery thermal runaway ejecta capture device provided by one embodiment of the present invention.

[0028] Figure 7 A top view of the battery and the fixture in the battery thermal runaway ejecta capture device provided in one embodiment of the present invention.

[0029] Figure Number:

[0030] 100-reaction vessel; 110-installation cavity; 120-matching hole; 130-one-way valve; 140-container door; 150-connecting hole; 200-first box body; 210-capture cavity; 220-first pressure relief valve; 230-first box body; 240-first box cover; 250-box lock; 300-second box body; 310-accommodation cavity; 320-second pressure relief valve; 330-second box body; 340-second box cover; 400-solid phase capture element; 410-first capture net; 510-second capture net; 520-clamp; 530-heating plate; 531-second wire; 540-temperature sensor; 541-first wire; 550-pressure sensor; 560-matching piece; 561-avoidance hole; 562-gas collection hole; 570-support frame; 600-battery. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0037] See Figure 1 and Figure 2 , Figure 1 A cross-sectional view of a battery thermal runaway ejecta capture device provided by one embodiment of the present invention. Figure 2A schematic diagram of a battery thermal runaway ejecta capture device provided in accordance with one embodiment of the present invention. The device comprises a reaction vessel 100, a first housing 200, a second housing 300, and a solid-phase capture element 400. The reaction vessel 100 includes a mounting chamber 110. The first housing 200 is accommodated in the mounting chamber 110 and includes a capture chamber 210. A first pressure relief valve 220 is provided on the wall of the capture chamber 210. The second housing 300 is accommodated in the capture chamber 210 and includes a receiving chamber 310. The receiving chamber 310 includes a preset position for mounting a battery 600. A second pressure relief valve 320 is provided on the wall of the receiving chamber 310. The solid-phase capture element 400 is installed on the wall of the receiving chamber 310, located to one side of the preset position, and is used to capture solid phases in ejecta.

[0038] Specifically, in the present application, when the battery 600 experiences thermal runaway within the second housing 300, the solid phase capture element 400 within the second housing 300 captures large particles in the ejected material. Small particles, along with the gas phase in the ejected material, enter the first housing 200 through the second pressure relief valve 320, where they are partially deposited on the walls of the capture chamber 210 and the outer wall of the second housing 300. The remaining fine particles, along with the gas phase in the ejected material, enter the reaction vessel 100 through the first pressure relief valve 220 and are deposited on the walls of the mounting chamber 110 and the outer wall of the second housing 300. This allows for complete capture and separation of the solid phase of the ejected material from the battery 600, thereby improving the accuracy and convenience of determining the composition of the ejected material. The battery in this embodiment is a lithium-ion battery.

[0039] See Figure 1 and Figure 3 , Figure 3 A cross-sectional view of the second housing of a battery thermal runaway ejecta capture device according to one embodiment of the present invention. In one embodiment, the solid-phase capture element 400 comprises at least two layers of spaced-apart first capture nets 410 connected to the walls of the accommodating chamber 310. The mesh size of each first capture net 410 decreases as it moves away from the predetermined position.

[0040] Specifically, in the direction away from the preset position, the aperture of each first capture net 410 decreases successively, so that each layer of the first capture net 410 can capture the solid phase of particles of different sizes in turn, so as to achieve the separation of the solid phase of particles of different sizes, so as to facilitate the subsequent study of the composition of the solid phase of particles of different sizes, thereby improving the adaptability of the solid phase capture element 400.

[0041] Furthermore, the solid phase capturing member 400 is located below a preset position, ie, below the battery 600 , so that solid phase particles of different sizes can be captured on different layers of the first capturing net 410 .

[0042] See Figure 1 and Figure 3 In one embodiment, the battery thermal runaway ejecta capture device includes a second capture net 510. The second capture net 510 is located on a side of the solid-phase capture element 400 close to a preset position. The aperture of the second capture net 510 is larger than the aperture of the mesh of each first capture net 410. The second capture net 510 is used to capture battery 600 debris.

[0043] Specifically, the aperture of the mesh of the second capture net 510 is larger than the aperture of the mesh of the top first capture net 410, and the second capture net 510 is located above the solid phase capture component 400. When the battery 600 is in thermal runaway, the battery 600 debris can be captured by the second capture net 510, and the solid phase in the ejecta passes through the holes in the second capture net 510 and is captured by the first capture net 410, thereby improving the accuracy of the captured solid phase in the ejecta.

[0044] Among them, when the battery 600 is in thermal runaway, the liquid phase in the eruption will adhere to the first capture net 410, the second capture net 510 or the cavity wall of the accommodating cavity 310. The solid phase products collected by distillation are heated to capture the mixed liquid phase products therein to achieve the collection of the liquid phase in the eruption.

[0045] See Figure 1 In one embodiment, the solid phase capture member 400 is used to face the safety valve of the battery 600 installed at a preset position, so that the ejecta ejected through the safety valve can first move toward the first capture net 410 and the second capture net 510, so that the second capture net 510 can capture the battery 600 debris and the first capture net 410 can capture solid phases of particles of different sizes, and then flow out from the second pressure relief valve 320, thereby improving the reliability of the battery thermal runaway ejecta capture device.

[0046] See Figure 1 In one embodiment, the second pressure relief valve 320 is located in an area close to a preset position.

[0047] Specifically, during the thermal runaway process of the battery 600, the air pressure in the area near the battery 600 is the highest. By setting the second pressure relief valve 320 in an area close to the preset position, the second pressure relief valve 320 can be opened in time to avoid the explosion of the second box 300, thereby improving the safety of the battery thermal runaway ejecta capture device.

[0048] Furthermore, there are two second pressure relief valves 320, which are located on both sides of the preset position, so as to facilitate the discharge of gas in the accommodating cavity 310 and further improve the safety of the battery thermal runaway ejecta capture device. Figure 1 For example, the two second pressure relief valves 320 are respectively located on the left and right sides of the preset position.

[0049] See Figure 1 and Figure 3 In one embodiment, the second housing 300 includes a second housing cover 340 and a second housing body 330. One end of the second housing cover 340 is rotatably connected to the second housing body 330, and the other end is connected to the second housing body 330 via a latch. This facilitates opening and closing of the second housing cover 340 relative to the second housing body 330, facilitating installation of the battery 600, removal of solids captured by the solid-phase capture element 400, and sealing of the housing chamber 310. A preset position and second pressure relief valve 320 are provided on the second housing cover 340, and the first capture net 410 is mounted on the second housing body 330 and detachably connected thereto, thereby facilitating the collection of solid particles of varying sizes.

[0050] See Figure 1 、 Figure 3 、 Figure 4 and Figure 5 , Figure 4 A schematic diagram of the first box in a battery thermal runaway ejecta capture device provided in one embodiment of the present invention. Figure 5 A cross-sectional view of the first housing of a battery thermal runaway ejecta capture device according to one embodiment of the present invention. In one embodiment, the axes of the first pressure relief valve 220 and the second pressure relief valve 320 coincide with each other.

[0051] Specifically, when the second pressure relief valve 320 is opened, the gas in the accommodating chamber 310 will enter the capture chamber 210 through the second pressure relief valve 320, and the air pressure near the second pressure relief valve 320 is the largest. The axis of the first pressure relief valve 220 and the second pressure relief valve 320 coincide with each other, which can facilitate the timely opening of the first pressure relief valve 220, avoiding the explosion of the first box body 200, and improving the safety of the battery thermal runaway ejecta capture device.

[0052] See Figure 1 、 Figure 4 and Figure 5In one embodiment, the first housing 200 includes a first housing cover 240 and a first housing body 230. One end of the first housing cover 240 is rotatably connected to the first housing body 230, and the other end is connected to the first housing body 230 via a housing lock 250. This facilitates opening and closing of the first housing cover 240 relative to the first housing body 230, facilitating installation of the first housing 200, removal of solids deposited on the wall of the capture chamber 210, and sealing of the capture chamber 210. The first pressure relief valve 220 is mounted on the first housing cover 240.

[0053] See Figure 1 、 Figure 6 and Figure 7 , Figure 6 This is a front view of the battery 600 and the clamp 520 in the battery thermal runaway ejecta capture device provided by one embodiment of the present invention. Figure 7 A top view of a battery 600 and a fixture 520 in a battery thermal runaway ejecta capture device according to one embodiment of the present invention. In one embodiment, the battery thermal runaway ejecta capture device further includes a fixture 520, which is installed in a predetermined position and is used to hold the battery 600.

[0054] Specifically, the clamp 520 is used to fix the battery 600 at a preset position of the second box body 300, so that the battery 600 can stably perform thermal runaway in the accommodating cavity 310, avoiding the battery 600 from moving and affecting the separation of the solid phase of particles of different sizes.

[0055] See Figure 1 、 Figure 6 and Figure 7 In one embodiment, the battery thermal runaway ejecta capture device further includes a runaway trigger, which is mounted on the fixture 520 and is used to trigger thermal runaway of the battery 600 .

[0056] Specifically, the runaway trigger includes a heating plate 530 and a power source. The heating plate 530 is attached to the battery 600 and clamped to one side of the battery 600 by the clamp 520. The heating plate 530 is electrically connected to the power source to heat the battery 600 and trigger thermal runaway of the battery 600. The heating plate 530 is led out of the reaction vessel 100 through a second wire 531 to be electrically connected to a power source outside the reaction vessel 100, thereby improving the safety of the battery thermal runaway ejecta capture device. It should be noted that when the battery 600 thermal runaway occurs, the heating plate 530 stops heating the battery 600.

[0057] See Figure 1 In one embodiment, the battery thermal runaway ejecta capture device further includes a support frame 570 , which is disposed in the capture chamber 210 and is used to support the second box 300 .

[0058] See Figure 1 In one embodiment, the battery thermal runaway ejecta capture device further includes a temperature sensor 540, which is suspended in the mounting cavity 110. The temperature sensor 540 is used to detect the temperature of the gas in the reaction vessel 100, thereby determining whether the reaction vessel 100 can be opened to collect the solid phase in the ejecta. If the temperature of the gas in the reaction vessel 100 is too high, it may cause harm to the operator. If the temperature of the gas in the reaction vessel 100 is too low, it may affect the efficiency of collecting ejecta from the battery 600. A first wire 541 connected to the temperature sensor 540 is led out of the reaction vessel 100.

[0059] See Figure 1 In one embodiment, a pressure sensor 550 is installed in the reaction vessel 100, and a probe of the pressure sensor 550 extends into the mounting cavity 110. The pressure sensor 550 is used to detect the pressure in the reaction vessel 100 to prevent the pressure in the reaction vessel 100 from being too high when the reaction vessel 100 is opened, thereby preventing injury to the operator.

[0060] See Figure 1 and Figure 2 In one embodiment, the battery thermal runaway ejecta capture device further includes a fitting 560 and a gas collection bag. A connecting hole 150 is provided on the cavity wall of the mounting cavity 110. The fitting 560 is installed in the connecting hole 150 to control the opening and closing of the connecting hole 150. The gas collection bag is used to communicate with the connecting hole 150 to collect gas from the ejecta.

[0061] Specifically, when the values ​​displayed by the pressure sensor 550 and the temperature sensor 540 reach preset values, the gas collection bag can be connected to the connection hole 150 by operating the fitting 560, so as to collect the gas phase in the ejected material when the battery 600 thermally runs away.

[0062] Among them, the fitting 560 has two avoidance holes 561, and the first wire 541 and the second wire 531 are led out of the reaction vessel 100 through the two avoidance holes 561. It should be noted that a sealing plug is provided on the avoidance hole 561 to ensure the sealing of the installation cavity 110. The fitting 560 has an air collecting hole 562 connected to the installation cavity 110, and the air collecting hole 562 is provided with an adjustment block. The adjustment block is used to seal the air collecting hole 562. When the air collecting bag is connected to the fitting 560, the adjustment block is controlled so that the air collecting bag is connected to the installation cavity 110 through the air collecting hole 562, thereby facilitating air collection. Among them, the adjustment block is a stud, and a sealing gasket is provided on the stud. Preferably, the fitting 560 is a branch line flange.

[0063] It should be noted that the air collection bag can be installed on the matching component 560 when air collection is needed, or it can be installed on the matching component 560 in advance.

[0064] See Figure 1 and Figure 2 In one embodiment, the reaction container 100 is further provided with a matching hole 120, and a one-way valve 130 is installed on the matching hole 120. After the gas collecting bag has collected the gas phase, the gas in the reaction container 100 can be discharged by controlling the one-way valve 130.

[0065] Furthermore, the reaction container 100 further comprises a container door 140, so as to facilitate installation and removal of the first box body 200 and the second box body 300 in the installation cavity 110. Preferably, the reaction container 100 is a constant volume pressure container.

[0066] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A battery thermal runaway ejecta capture device, characterized in that: The battery thermal runaway ejecta capture device comprises: a reaction vessel having a mounting cavity; A first box body is accommodated in the installation cavity, the first box body has a capture cavity, and a first pressure relief valve is provided on the cavity wall of the capture cavity; a second box body, which is accommodated in the capture chamber, and has a receiving chamber, wherein the receiving chamber has a preset position for installing the battery, and a second pressure relief valve is provided on the wall of the receiving chamber; and a solid phase capture member installed on the cavity wall of the accommodating cavity and located on one side of the preset position, the solid phase capture member being used to capture the solid phase in the ejected material; The solid phase capturing element comprises at least two layers of first capturing nets spaced apart from each other, the first capturing nets being connected to the cavity wall of the accommodating cavity, and the apertures of the meshes of the first capturing nets decreasing in sequence in the direction away from the preset position.

2. The battery thermal runaway ejecta capture device according to claim 1, characterized in that: The battery thermal runaway ejecta capture device includes a second capture net, which is located on the side of the solid phase capture component close to the preset position. The aperture of the second capture net is larger than the aperture of the mesh of each first capture net, and the second capture net is used to capture the battery debris.

3. The battery thermal runaway ejecta capture device according to claim 1, characterized in that: Each of the first collecting nets is used to face the safety valve of the battery installed at the preset position.

4. The battery thermal runaway ejecta capture device according to any one of claims 1 to 3, characterized in that: The second pressure relief valve is located in an area close to the preset position.

5. The battery thermal runaway ejecta capture device according to any one of claims 1 to 3, characterized in that: The axes of the first pressure relief valve and the second pressure relief valve coincide with each other.

6. The battery thermal runaway ejecta capture device according to any one of claims 1 to 3, characterized in that: The battery thermal runaway ejecta capture device further includes a clamp, which is installed at the preset position and is used to clamp the battery.

7. The battery thermal runaway ejecta capture device according to claim 6, characterized in that: The battery thermal runaway ejecta capture device further includes a runaway trigger component, which is mounted on the fixture and is used to trigger the battery thermal runaway.

8. The battery thermal runaway ejecta capture device according to any one of claims 1 to 3, characterized in that: The battery thermal runaway ejecta capture device further comprises: a temperature sensor suspended in the mounting cavity; and / or, A pressure sensor is installed in the reaction container, and a probe of the pressure sensor extends into the installation cavity.

9. The battery thermal runaway ejecta capture device according to any one of claims 1 to 3, characterized in that: The battery thermal runaway ejecta capture device also includes a fitting and a gas collection bag. The cavity wall of the mounting cavity is provided with a connection hole. The fitting is installed in the connection hole to control the opening and closing of the connection hole. The gas collection bag is used to communicate with the connection hole to collect gas from the ejecta.

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