Lithium battery production waste gas filtering device

Abstract

The utility model relates to a lithium battery production waste gas filtering device which is used for a lithium battery production workshop and comprises a filter, an exhaust channel and a connecting piece, the exhaust channel is fixed at the top of the production workshop and communicated with an exhaust outlet of the production workshop, and the connecting piece is connected with the filter. The filter is detachably installed in the exhaust channel and is in sealing fit with the inner wall of the exhaust channel. According to the utility model, the exhaust channel is arranged and the filter is detachably arranged in the exhaust channel, so that the filter is convenient to replace, the operation is simple, the replacement is convenient, the replacement efficiency is improved, and meanwhile, the exhaust channel can prevent an ash layer accumulated in an external exhaust pipeline from falling into a production workshop through the exhaust outlet, so that the cleanness in the production workshop is ensured; meanwhile, adverse effects of dust on the filter can be prevented, and meanwhile, after the filter is used for a long time, pollutants such as dust and aerosol particles gathered on the filter can be prevented from falling into a production workshop.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a waste gas filtering device for lithium battery production. Background Art

[0002] With the rapid development of lithium battery technology, lithium batteries are now widely used in mobile phones, computers, cars, electric vehicles, satellites, space shuttles and other fields due to their small size, light weight, high energy density and long service life, bringing convenience to our work and life. At the same time, lithium battery factories will generate a large amount of waste gas in the process of battery production, which will cause great harm to operators and the environment. Therefore, in the process of lithium battery production, the waste gas generated will be treated accordingly when it is discharged. When the existing waste gas treatment device is in use, the filter is usually fixed inside the device, and the waste gas treatment device is connected to the exhaust port of the production workshop by setting an external exhaust pipe. The air in the production workshop enters the waste gas treatment device through the exhaust port, and the harmful substances in the air are treated by the waste gas treatment device. However, during the later maintenance of this waste gas treatment device, since the filter is installed inside the device, the removal of the filter is cumbersome, time-consuming and laborious. Utility Model Content

[0003] Based on this, in view of the technical problem that during the later maintenance of the existing exhaust gas treatment device, the filter is installed inside the device, and the removal of the filter is cumbersome, time-consuming and labor-intensive, it is necessary for the utility model to provide a lithium battery production exhaust gas filtration device.

[0004] The utility model proposes a lithium battery production waste gas filtering device, which is used in a lithium battery production workshop, and includes a filter, an exhaust channel and a connecting piece. The exhaust channel is fixed on the top of the production workshop and is connected to the exhaust port of the production workshop. The filter is detachably installed in the exhaust channel and the filter is sealed with the inner wall of the exhaust channel.

[0005] The utility model discloses to provide the filter that can replace easily by the dust layer that the dust in the filter is used for a long time, and the dust that the dust in the filter is used for a long time can be prevented from falling into the production workshop.

[0006] As a further improvement of the above scheme of the utility model, an installation port is opened on the exhaust channel, which is connected with the interior of the exhaust channel and compatible with the filter; the lithium battery production waste gas filtering device also includes a connecting piece, and the filter is detachably installed in the exhaust channel through the connecting piece, and the connecting piece includes a sealing block, a magnet block and an electromagnet; the sealing block and the magnet block are respectively fixed at the opposite ends of the filter, and the sealing block is detachably arranged in the installation port; the electromagnet and the magnet block are arranged opposite to each other and the electromagnet is fixed to the inner wall of the exhaust channel, and the electromagnet has a power-off state and a power-on state. When the electromagnet is in the power-off state, the electromagnet and the magnet block attract each other to confine the filter in the exhaust channel; when the electromagnet is in the power-on state, the electromagnet and the magnet block repel each other to make the filter pop out of the installation port.

[0007] As a further improvement of the above scheme of the utility model, the installation port is located at the top of the exhaust channel, and a mounting groove adapted to the electromagnet is opened at the bottom of the exhaust channel, and the mounting groove and the installation port are not in the same vertical plane, and the electromagnet is fixed in the mounting groove.

[0008] As a further improvement of the above-mentioned scheme of the utility model, limiting plates are fixed on the inner walls of the exhaust channel at both sides of the installation port, the two limiting plates are arranged in parallel and opposite to each other, the distance between the two limiting plates is consistent with the thickness of the filter and the two ends of the two limiting plates are both in contact with the inner walls of the exhaust channel on both sides, the connection between the filter and the sealing block is located between the two limiting plates and the two side surfaces of the filter are respectively in contact with the two limiting plates.

[0009] As a further improvement of the above-mentioned scheme of the utility model, two limiting plates are fixed on the inner walls of the exhaust channel at both sides of the installation groove, the two limiting plates are arranged in parallel and opposite to each other, the distance between the two limiting plates is consistent with the thickness of the filter and the two ends of the two limiting plates are both in contact with the inner walls of the exhaust channel on both sides, the connection between the filter and the magnet block is located between the two limiting plates and the two side surfaces of the filter are respectively in contact with the two limiting plates.

[0010] As a further improvement of the above solution of the utility model, a protrusion is formed at one end of the magnet block away from the filter, and a silicone ring is sheathed outside the protrusion to achieve sealing between the protrusion and the electromagnet.

[0011] As a further improvement of the above scheme of the utility model, the sealing block has a structure with a T-shaped cross-section, the installation opening is a step opening with a T-shaped cross-section adapted to the sealing block, and a silicone ring 2 is provided on the step surface of the sealing block to achieve sealing between the sealing block and the installation opening.

[0012] As a further improvement of the above-mentioned scheme of the utility model, silicone pads are fixed to the inner walls of the exhaust channel at both sides of the filter and metal plates are arranged inside the silicone pads, and power-off type electromagnets are fixed on both sides of the filter. When the power is off, the two power-off type electromagnets are respectively attracted to the metal plates inside the two silicone pads to achieve sealing between the filter and the exhaust channel. When the power is on, the two power-off type electromagnets lose their magnetism and do not attract the metal plates inside the two silicone pads.

[0013] As a further improvement of the above scheme of the utility model, the silicone pad is bonded to the inner wall of the exhaust channel, and the two ends of the silicone pad extend between the two limit plates 1 and the two limit plates 2 respectively, and the top of the power-off type electromagnet is tightly connected to the sealing block.

[0014] As a further improvement of the above solution of the utility model, the lithium battery production waste gas filtering device also includes an external exhaust pipe, one end of which is connected to the air outlet end of the exhaust channel and the other end of which is connected to an external exhaust fan.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model sets an exhaust channel and detachably sets the filter in the exhaust channel, which is convenient for replacing the filter, simple to operate, easy to replace, and improves the replacement efficiency. At the same time, the exhaust channel can prevent the dust layer accumulated in the external exhaust pipe from falling into the production workshop through the exhaust port, and can also prevent the dust from causing adverse effects on the filter. At the same time, when the filter has been used for too long, pollutants such as dust and aerosol particles gathered on the filter can be prevented from falling into the production workshop, thereby ensuring the cleanliness of the production workshop.

[0017] 2. The utility model sets the filter obliquely with the windward side facing the filter. When replacing or removing the filter, pollutants adsorbed on the windward side of the filter can be prevented from polluting the production workshop, thereby ensuring the cleanliness of the production workshop.

[0018] 3. The structural setting of the connecting piece of the utility model is that the electromagnet is usually in a power-off state, and is attracted to the magnet block to restrict and fix the filter in the exhaust duct. When the filter needs to be replaced, it is only necessary to energize the electromagnet. The magnetic poles generated by the energized electromagnet are consistent with the magnetic poles of the magnet block and repel the magnet block. The electromagnet pushes the magnet block to drive the filter to make the sealing block pop out of the installation port, which is convenient for replacing the filter. The operation is simple, the replacement is convenient, and the replacement efficiency is improved. After taking out the filter, the electromagnet is powered off, and the new filter is inserted into the installation port, extending along the limit plate 1 and the limit plate 2 until the magnet block approaches the electromagnet, and the magnet block absorbs the electromagnet to complete the fixation of the filter.

[0019] 4. The utility model has a structure in which the power-off type electromagnets on both sides of the filter and the silicone pads on the inner walls on both sides of the exhaust duct have a magnetic field when the power-off type electromagnets are not energized, and the metal plates in the silicone pads are adsorbed to prevent the gas in the production workshop from leaking from the gap between the power-off type electromagnets and the inner walls of the exhaust duct, thereby ensuring the sealing between the filter and the exhaust duct. When replacing the filter, the filter can be replaced by simply energizing the power-off type electromagnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a lithium battery production waste gas filtering device proposed in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 3 A schematic diagram of a connector and a filter in a lithium battery production waste gas filtering device proposed in an embodiment of the utility model;

[0023] Figure 4 for Figure 3 Front view of

[0024] Figure 5 for Figure 4 Middle BB section view;

[0025] Figure 6 A schematic diagram of the structure of a magnet block in a lithium battery production waste gas filtering device proposed in an embodiment of the utility model;

[0026] Figure 7 This is a schematic structural diagram of a rubber ring in a lithium battery production waste gas filtering device proposed in an embodiment of the utility model.

[0027] Figure numerals: 1. filter; 2. exhaust duct; 201. installation port; 202. installation slot; 203. limit plate one; 204. limit plate two; 3. connector; 301. sealing block; 302. magnet block; 303. electromagnet; 304. silicone ring one; 305. silicone ring two; 4. silicone pad; 5. metal plate; 6. power-off type electromagnet; 7. external exhaust pipe; 8. external exhaust fan; 9. production workshop. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively in conjunction with specific embodiments below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] This embodiment proposes a lithium battery production waste gas filtering device, which is used in a lithium battery production workshop 9, including a filter 1, an exhaust channel 2 and a connector 3, and may also include an external exhaust pipe 7.

[0031] The exhaust channel 2 is arranged at the top of the production workshop 9 and its air outlet is connected to the exhaust port at the top of the production workshop 9. In the present embodiment, the exhaust channel 2 is a structure with a square cross section. The filter 1 is detachably installed in the exhaust channel 2 through the connector 3 and the filter 1 is sealed with the inner wall of the exhaust channel 2, and the filter 1 is arranged at an angle. One end of the external exhaust duct 7 is connected to the exhaust port to communicate with the exhaust channel 2, and an external exhaust fan 8 is installed at the other end of the external exhaust duct 7. When the external exhaust fan 8 is started, the air of the production workshop 9 enters the external exhaust duct 7 along the exhaust channel 2, and is discharged into the outside after the impurities in the air are filtered by the filter 1. When the filter 1 needs to be replaced, the filter 1 can be directly removed from the exhaust channel 2 for replacement. The operation is simple, the replacement is convenient, and the replacement efficiency is improved. By setting the exhaust channel 2 and setting the filter 1 in the exhaust channel 2, the dust layer accumulated in the external exhaust pipe 7 can be prevented from falling into the production workshop 9 through the exhaust port, thereby ensuring the cleanliness of the production workshop 9. At the same time, it can also prevent dust from causing adverse effects on the filter 1. At the same time, when the filter 1 has been used for too long, pollutants such as dust and aerosol particles gathered on the filter 1 can be prevented from falling into the production workshop 9.

[0032] In this embodiment, a mounting opening 201 communicating with the inside of the exhaust channel 2 is provided at the top of the exhaust channel 2 near its air inlet. The mounting opening 201 is a stepped opening with a T-shaped cross section, and the length of the mounting opening 201 is equal to the width of the exhaust channel 2. A mounting groove 202 opposite to the mounting opening 201 is provided at the bottom of the exhaust channel 2. The length of the mounting groove 202 is equal to the width of the exhaust channel 2, and the mounting groove 202 and the mounting opening 201 are not in the same vertical plane. The inner wall of the exhaust channel 2 is located at both sides of the mounting opening 201 and fixed with a limiting plate 1 203. The two limiting plates 1 203 are arranged in parallel and opposite to each other, and the two sides of the two limiting plates 1 203 are respectively fitted with the inner walls of the exhaust channel 2 on both sides. The inner wall of the exhaust channel 2 is located at both sides of the mounting groove 202 and fixed with a limiting plate 2 204. The two limiting plates 204 are arranged in parallel and opposite to each other, and the two sides of the two limiting plates 1 203 are respectively fitted with the inner walls of the exhaust channel 2 on both sides. In this embodiment, the distance between the two limiting plates 1 203 is equal to the distance between the two limiting plates 204. In this embodiment, the limiting plates 1 203 and 204 are fixed in the exhaust passage 2 by welding or an integrated structure.

[0033] In this embodiment, the filter 1 adopts the flat square frame filter in the prior art. The filter 1 is a square structure. The thickness and length of the filter 1 are respectively adapted to the minimum width and length of the installation port 201, ensuring that the filter 1 can enter the exhaust duct 2 through the installation port 201, and the thickness of the filter 1 is equal to the distance between the two limit plates 1 203 and the distance between the two limit plates 204; the filter element material of the filter can be selected according to the specific pollutants, such as activated carbon, alumina, fiber, etc.

[0034] In this embodiment, the connecting member 3 includes a sealing block 301, a magnet block 302 and an electromagnet 303. The sealing block 301 and the magnet block 302 are respectively fixed at the top and bottom of the filter 1, and the sealing block 301 and the magnet block 302 are sealed and connected to the filter 1 by a buckle or a screw connection. The sealing block 301 is arranged in the installation port 201 and the sealing block 301 is a T-shaped structure adapted to the installation port 201. The connection between the sealing block 301 and the filter 1 is located between the two limiting plates 1 203 and the tops of the two sides of the filter 1 are respectively fitted with the two limiting plates 1 203. The connection between the magnet block 302 and the filter 1 is located between the two limiting plates 204 and the bottoms of the two sides of the filter 1 are respectively fitted with the two limiting plates 2 204. The limiting plates 1 203 and the limiting plates 2 204 play a role in limiting the position and direction of the filter 1. By pulling the sealing block 301 from the outside, the filter 1 and the electromagnet 303 can be taken out of the exhaust channel 2. The electromagnet 303 is fixed in the mounting groove 202 and the length of the electromagnet 303 is equal to the length of the mounting groove 202. The electromagnet 303 has a power-off state and a power-on state. When the electromagnet 303 is in the power-off state, the electromagnet 303 and the magnet block 302 attract each other to confine the filter 1 in the exhaust passage 2; when the electromagnet 303 is in the power-on state, the electromagnet 303 and the magnet block 302 repel each other to make the filter 1 pop out from the mounting opening 201. During use, the electromagnet 303 is in the power-off state. When the filter 1 needs to be replaced, the electromagnet 303 is energized. The magnetic poles generated by the electromagnet 303 being energized are consistent with the magnetic poles of the magnet block 302 and repel the magnet block 302, so that the filter 1 can be popped out from the mounting opening 201. In this embodiment, the wires for powering the electromagnet 303 can be directly arranged on the exhaust passage 2.

[0035] In this embodiment, a protrusion is formed at one end of the magnet block 302 close to the electromagnet 303, and a silicone ring 304 is mounted on the outer surface of the protrusion to achieve sealing between the protrusion and the electromagnet 303. The silicone ring 304 is a rectangular parallelepiped structure with a hollow middle, and the silicone ring 304 is mounted on the protrusion of the magnet block 302, and the thickness of the silicone ring 304 is slightly greater than the height of the protrusion. The silicone ring 304 plays the role of sealing the connection between the magnet block 302 and the electromagnet 303, and prevents the gas in the production workshop 9 from leaking from the gap between the magnet block 302 and the electromagnet 303.

[0036] In this embodiment, a second silicone ring 305 is provided on the step surface of the sealing block 301 to achieve sealing between the sealing block 301 and the installation opening 201. The second silicone ring 305 prevents the gas in the production workshop 9 from leaking from the gap between the sealing block 301 and the installation opening 201.

[0037] In order to ensure the sealing between the filter 1 and the inner wall of the exhaust passage 2 and prevent the gas in the production workshop 9 from leaking from the gap between the filter 1 and the side wall of the exhaust passage 2, in this embodiment, the inner wall of the exhaust passage 2 is fixed with a silicone pad 4 by adhesive on both sides of the filter 1, and a metal plate 5 is arranged inside the silicone pad 4. The height of the silicone pad 4 is adapted to the height of the exhaust passage 2, and the top and bottom of the silicone pad 4 extend between the two limit plates 1 203 and the two limit plates 2 204 respectively. A de-energized electromagnet 6 is fixed on both sides of the filter 1 by a buckle or screw connection. The length of the de-energized electromagnet 6 is adapted to the length of the silicone pad 4. The top of the de-energized electromagnet 6 is tightly connected to the sealing block 301 by a buckle or screw connection. A 5 cm vertical spacing is reserved between the bottom of the de-energized electromagnet 6 and the magnet block 302 to avoid mutual influence between the de-energized electromagnet 6 and the magnet block 302. When the power is off, the two power-off electromagnets 6 are respectively attracted to the metal plates 5 in the two silicone pads 4 to achieve the seal between the filter 1 and the exhaust duct 2. When the power is on, the two power-off electromagnets 6 lose their magnetism and do not attract the metal plates 5 in the two silicone pads 4. When the filter 1 needs to be replaced, the power-off electromagnets 6 are powered on to demagnetize, and the power-off electromagnets 6 are disconnected from the metal plates 5 in the silicone pads 4, so that the filter 1 can be ejected from the installation port 201. In this embodiment, the wires for powering the power-off electromagnets 6 can be drilled or slotted on the T-shaped sealing block 301 to lay the wires, and the sealant is used for sealing.

[0038] Next, the working principle of this embodiment is described.

[0039] Under normal conditions, the top surface of the sealing block 301 is on the same plane as the top surface of the production workshop 9, and a silicone ring 1 304 is used between the sealing block 301 and the installation port 201 to prevent the gas in the production workshop 9 from leaking from the gap between the sealing block 301 and the installation port 201. The filter 1 is obliquely fixed in the exhaust duct 2 by two limit plates 1 203 and two limit plates 204; the magnet block 302 is fixedly connected to the electromagnet 303 which is not energized by magnetism, and a silicone ring 2 305 is provided between the magnet block 302 and the electromagnet 303, so that the magnet block 302 is sealed and connected to the exhaust duct 2, and the de-energized electromagnet 6 located on both sides of the filter 1 is not energized and has a magnetic field, which absorbs the metal plate 5 in the silicone pad 4 to prevent the gas in the production workshop 9 from leaking from the gap between the de-energized electromagnet 6 and the inner wall of the exhaust duct 2, thereby ensuring complete sealing performance; when the filter 1 needs to be replaced, only the de-energized electromagnet 303 needs to be replaced. The magnet 6 is powered on to demagnetize, and the electromagnet 303 is powered on to generate a magnetic field. Since the magnetic field generated by the electromagnet 303 is of the same polarity as the magnetic field generated by the magnet block 302, the electromagnet 303 pushes the magnet block 302 to drive the filter 1 to make the sealing block 301 pop out of the installation port 201. Since the filter 1 is arranged obliquely, when the filter 1 is replaced or removed, the pollutants adsorbed on the windward surface of the filter 1 can be prevented from contaminating the production workshop 9, thereby ensuring the cleanliness of the production workshop 9. The filter 1 is then taken out to complete the replacement, and the new filter 1 is inserted into the installation port 201, extending along the limit plate 1 203 and the limit plate 2 204 until the magnet block 302 approaches the electromagnet 303, and the electromagnet 303 is powered off, and the magnet block 302 absorbs the electromagnet 303 to complete the fixation of the filter 1. Subsequently, the power-off type electromagnet 6 is powered off, and the power-off type electromagnet 6 absorbs the metal plate 5 in the silicone pad 4 to complete the replacement of the filter 1.

[0040] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0043] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A lithium battery production waste gas filtering device, used in a lithium battery production workshop (9), comprising a filter (1), characterized in that: It also includes an exhaust passage (2), which is fixed on the top of the production workshop (9) and communicated with the exhaust port of the production workshop (9), and the filter (1) is detachably installed in the exhaust passage (2) and the filter (1) is sealed with the inner wall of the exhaust passage (2).

2. The lithium battery production waste gas filtration device according to claim 1, characterized in that: The exhaust passage (2) is provided with a mounting opening (201) which is in communication with the interior of the exhaust passage (2) and is adapted to the filter (1); the lithium battery production waste gas filtering device further comprises a connecting piece (3), the filter (1) is detachably mounted in the exhaust passage (2) via the connecting piece (3), the connecting piece (3) comprising a sealing block (301), a magnet block (302) and an electromagnet (303); the sealing block (301) and the magnet block (302) are respectively fixed at opposite ends of the filter (1), and the sealing block (301) is detachably arranged at the mounting opening (2 01); the electromagnet (303) and the magnet block (302) are arranged opposite to each other and the electromagnet (303) is fixed to the inner wall of the exhaust passage (2); the electromagnet (303) has a power-off state and a power-on state; when the electromagnet (303) is in the power-off state, the electromagnet (303) and the magnet block (302) attract each other to confine the filter (1) in the exhaust passage (2); when the electromagnet (303) is in the power-on state, the electromagnet (303) and the magnet block (302) repel each other to make the filter (1) pop out from the installation opening (201).

3. The lithium battery production waste gas filtration device according to claim 2, characterized in that: The mounting opening (201) is located at the top of the exhaust passage (2), a mounting groove (202) adapted to the electromagnet (303) is provided at the bottom of the exhaust passage (2), and the mounting groove (202) and the mounting opening (201) are not in the same vertical plane, and the electromagnet (303) is fixed in the mounting groove (202).

4. The lithium battery production waste gas filtration device according to claim 3, characterized in that: Limiting plates (203) are fixed to the inner wall of the exhaust passage (2) at both sides of the installation opening (201); the two limiting plates (203) are arranged parallel to each other; the distance between the two limiting plates (203) is consistent with the thickness of the filter (1); and both ends of the two limiting plates (203) are in contact with the inner walls of the exhaust passage (2); the connection between the filter (1) and the sealing block (301) is located between the two limiting plates (203); and the two side surfaces of the filter (1) are in contact with the two limiting plates (203) respectively.

5. The lithium battery production waste gas filtration device according to claim 3, characterized in that: The inner wall of the exhaust passage (2) is fixed with two limiting plates (204) at both sides of the installation groove (202); the two limiting plates (204) are arranged parallel to each other; the distance between the two limiting plates (204) is consistent with the thickness of the filter (1); and both ends of the two limiting plates (204) are in contact with the inner walls of the exhaust passage (2); the connection between the filter (1) and the magnet block (302) is located between the two limiting plates (204); and the two side surfaces of the filter (1) are respectively in contact with the two limiting plates (204).

6. The lithium battery production waste gas filtration device according to claim 2, characterized in that: A protrusion is formed at one end of the magnet block (302) away from the filter (1), and a silicone ring (304) is sheathed outside the protrusion to achieve sealing between the protrusion and the electromagnet (303).

7. The lithium battery production waste gas filtration device according to claim 2, characterized in that: The sealing block (301) has a structure with a T-shaped cross section, the mounting opening (201) is a stepped opening with a T-shaped cross section adapted to the sealing block (301), and a second silicone ring (305) is provided on the stepped surface of the sealing block (301) for achieving sealing between the sealing block (301) and the mounting opening (201).

8. The lithium battery production waste gas filtering device according to claim 3, characterized in that: Silicone pads (4) are fixed to the inner walls of the exhaust passage (2) at positions on both sides of the filter (1), and metal plates (5) are arranged in the silicone pads (4). Power-off type electromagnets (6) are fixed to both sides of the filter (1). When power is off, the two power-off type electromagnets (6) are respectively attracted to the metal plates (5) in the two silicone pads (4) to achieve sealing between the filter (1) and the exhaust passage (2). When power is on, the two power-off type electromagnets (6) lose their magnetism and are not attracted to the metal plates (5) in the two silicone pads (4).

9. The lithium battery production waste gas filtering device according to claim 8, characterized in that: The silicone pad (4) is bonded to the inner wall of the exhaust passage (2), and the two ends of the silicone pad (4) extend between two limit plates 1 (203) and two limit plates 2 (204) respectively. The top end of the power-off type electromagnet (6) is tightly connected to the sealing block (301).

10. The lithium battery production waste gas filtering device according to claim 1, characterized in that: The lithium battery production waste gas filtering device also includes an external exhaust pipe (7), one end of the external exhaust pipe (7) is connected to the air outlet end of the exhaust channel (2) and the other end is connected to the external exhaust fan (8).

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