A rubber tapping device for lithium battery production

By designing an automated glue cutting device for lithium battery production, using a motor-driven rotor and cutting knife, the sealing performance problem caused by excessive glue in lithium battery production is solved, and efficient and automated glue cutting operations are achieved, which improves the battery sealing performance and avoids the risk of manual operation.

CN119772968AInactive Publication Date: 2025-04-08HUNAN BAOTERINENG NEW ENERGY CO LTD
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Patent Information

Application Number
CN202411891347.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-04-08
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the production process of lithium batteries, excessive glue may lead to the formation of bubbles or voids, destroying sealing performance, and the prior art relies on manual glue cutting, which is inefficient and prone to damage the battery.

Method used

A rubber cutting device for lithium battery production is designed, including a motor-driven rotary drum, mobile rod, spring, connecting block, mobile sleeve, vertical rod, sleeve, cross rod and cutting knife, which is connected to the lithium battery conveying mechanism through a transmission assembly to realize automated rubber cutting operation.

Benefits of technology

It improves the efficiency of rubber cutting, reduces the generation of bubbles and voids, enhances the battery sealing performance, and avoids battery damage caused by manual operation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to the technical field of lithium battery production, and discloses a rubber tapping device for lithium battery production, comprising a base, a lithium battery conveying mechanism is arranged on the front side of the top of the base, and a first baffle and a third baffle are respectively fixedly installed on both sides of the rear side of the top of the base; a rubber tapping assembly is arranged on the rear side of the top of the base, and the rubber tapping assembly comprises a motor, a rotating drum, a moving rod, a connecting block, a first spring, a moving sleeve, a vertical rod, a sleeve, a cross bar and a cutting knife, and a motor is fixedly installed on the rear side of the top of the base. The motor is used as a drive to drive the rotating drum to rotate, because the rotating drum is connected with the vertical rod by the moving rod, the first spring, the connecting block, and the moving sleeve, and then connected with the cross bar by the vertical rod by the sleeve, so that the cutting knife on the moving sleeve can be driven to move along the vertical rod and the cross bar in a square trajectory, and when the cutting knife is located below the vertical rod and moves in a straight line, it is convenient to tap the lithium battery on the first baffle, thereby improving the efficiency of rubber tapping.
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Description

Technical Field

[0001] The invention relates to the technical field of lithium battery production, and in particular to a rubber tapping device for lithium battery production. Background Art

[0002] During the lithium battery production process, during the end cap installation process, if there is too much glue, bubbles or gaps may form in the sealant layer, and the excess glue may cause the end cap installation position to be offset or uneven. These bubbles and gaps will destroy the continuity of the seal and reduce the sealing performance of the battery. Cutting off the excess glue will help reduce the generation of bubbles and gaps and improve the tightness of the seal.

[0003] Most existing lithium batteries are tapped manually after production, which may cause damage to the lithium batteries due to improper operation or errors. At the same time, the efficiency of manual tapping is relatively low, and lithium batteries cannot be tapped in large quantities. Summary of the invention

[0004] The object of the present invention is to provide a rubber tapping device for lithium battery production to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a rubber tapping device for lithium battery production, comprising:

[0006] A base, wherein a lithium battery conveying mechanism is provided on the front side of the top of the base, and a first baffle and a third baffle are respectively fixedly installed on both sides of the rear side of the top of the base;

[0007] A rubber tapping assembly is arranged on the rear side of the top of the base, and the rubber tapping assembly includes a motor, a rotating drum, a moving rod, a connecting block, a first spring, a moving sleeve, a vertical rod, a sleeve, a cross bar and a cutting knife. The motor is fixedly installed on the rear side of the top of the base, and the output shaft of the motor is fixedly connected to the rotating drum. The inner cavity of the rotating drum is movably sleeved with the moving rod, one end of the moving rod is fixedly connected to the connecting block, the outer side of the moving rod is movably sleeved with the first spring, the two ends of the first spring are respectively connected to the rotating drum and the connecting block, the connecting block is rotatably connected with the moving sleeve, the inner cavity of the moving sleeve is movably sleeved with the vertical rod, the top of the vertical rod is fixedly installed with a sleeve, the inner cavity of the sleeve is movably sleeved with a cross bar, the two ends of the cross bar are respectively fixedly connected to the first baffle and the third baffle, and the cutting knife is fixedly installed on the front side of the moving sleeve;

[0008] A transmission assembly is provided at the rear side of the first baffle, and the lithium battery conveying mechanism is connected to the rubber tapping assembly by the transmission assembly.

[0009] As a further improvement of the present invention, the lithium battery conveying mechanism includes a support plate, a first rotating shaft, a first pulley, a first belt and a placement seat. Two support plates are fixedly installed on the front side of the top of the base. The rear sides of the two support plates are rotatably connected to the first rotating shaft. The two first rotating shafts are connected by a first pulley and a first belt transmission. The outer side of the first belt is fixedly connected to a placement seat.

[0010] As a further improvement of the present invention, the transmission assembly includes a second rotating shaft, a second pulley, a second belt, an auxiliary block, a third pulley and a third belt. The rear sides of the first baffle and the third baffle are rotatably connected to the second rotating shaft. The two second rotating shafts are connected by the second pulley and the second belt. The outer side of the second belt is fixedly connected to the auxiliary block. The rear side of the first rotating shaft and the rear side of the first rotating shaft are connected by the third pulley and the third belt. The first push plate is fixedly installed on the rear side of the movable sleeve.

[0011] As a further improvement of the present invention, the second belt is provided with a plurality of auxiliary blocks evenly distributed along the outer side of the second belt, and the distance between two adjacent auxiliary blocks is less than the length of the cross bar.

[0012] As a further improvement of the present invention, the first push plate is in an L-shape as a whole, and the rear side of the first push plate and the rear side of the auxiliary block are on the same horizontal plane.

[0013] As a further improvement of the present invention, the first belt is provided with a plurality of placement seats evenly distributed along the outer side of the first belt, and the tops of the placement seats are provided with arc-shaped grooves.

[0014] As a further improvement of the present invention, a waste rubber sorting component is provided at the lower part of the first baffle, and the waste rubber sorting component includes a second push plate, a telescopic rod, a gathering plate and a second spring. The inner cavity at the lower part of the first baffle is fixedly connected with the telescopic rod, one side of the telescopic rod is fixedly connected with the gathering plate, the outer side of the telescopic rod is movably sleeved with a second spring, the two ends of the second spring are respectively connected with the first baffle and the gathering plate, and the bottom of the movable sleeve is fixedly connected with the second push plate.

[0015] As a further improvement of the present invention, one side of the second push plate is located on the side of the gathering plate close to the first baffle plate, and is in contact with the side of the gathering plate close to the first baffle plate.

[0016] As a further improvement of the present invention, the cross section of the gathering plate is U-shaped, and the gathering plate is located below the vertical rod and the cutting knife.

[0017] As a further improvement of the present invention, the vertical rod and the horizontal rod are vertically distributed, and the front side of the cutting knife is in contact with the rear side of the first baffle.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The rubber tapping device for lithium battery production is driven by a motor to drive the rotating drum to rotate. Since the rotating drum is connected to the vertical rod by a moving rod, a first spring, a connecting block, and a moving sleeve, and then connected to the cross rod by a sleeve through the vertical rod, the cutting knife on the moving sleeve can be driven to move along the vertical rod and the cross rod in a square trajectory. When the cutting knife is located below the vertical rod and moves in a straight line, it is convenient to tap the lithium battery on the first baffle, thereby improving the efficiency of rubber tapping.

[0020] 2. The rubber tapping device for lithium battery production is connected to the lithium battery conveying mechanism through the rubber tapping assembly using the transmission assembly. When the motor drives the first push plate to move upward and connect with the auxiliary block on the second belt, when the movable sleeve moves horizontally along the cross bar above the vertical rod, it can push the auxiliary block to move, thereby driving the second belt and the second rotating shaft to rotate. Since the second rotating shaft is connected to the first rotating shaft by the third pulley and the third belt, when the cutting knife is located above the lithium battery conveying mechanism, it can drive the first belt to move and transport the lithium batteries that need to be tapped to the cutting position.

[0021] 3. The rubber tapping device for lithium battery production is provided with a waste rubber sorting component on the first baffle. When the movable sleeve moves horizontally under the vertical rod for cutting, it can drive the second push plate to move. The movement of the second push plate drives the gathering plate to move, so that the cut glue is gathered together for easy subsequent cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of a rubber tapping device for lithium battery production according to the present invention;

[0024] Figure 2 This is a rear structural schematic diagram of a rubber tapping device for lithium battery production according to the present invention;

[0025] Figure 3 A rubber tapping device for lithium battery production according to the present invention Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure of a rubber tapping assembly of a rubber tapping device for lithium battery production according to the present invention;

[0027] Figure 5This is a schematic structural diagram of a waste rubber arrangement assembly of a rubber tapping device for lithium battery production according to the present invention;

[0028] Figure 6 This is a schematic diagram of the first spring structure of a rubber tapping device for lithium battery production according to the present invention.

[0029] In the figure: 1, base; 2, first baffle; 3, third baffle; 4, lithium battery conveying mechanism; 401, support plate; 402, first rotating shaft; 403, first pulley; 404, first belt; 405, placement seat; 5, rubber tapping assembly; 501, motor; 502, rotating drum; 503, moving rod; 504, connecting block; 505, first spring; 506, moving sleeve; 507, vertical rod; 508, sleeve; 509, cross bar; 510, cutting knife; 6, transmission assembly; 601, second rotating shaft; 602, second pulley; 603, second belt; 604, auxiliary block; 605, third pulley; 606, third belt; 607, first push plate; 7, waste rubber sorting assembly; 701, second push plate; 702, telescopic rod; 703, gathering plate; 704, second spring. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-Figure 6 The present invention provides a rubber tapping device for lithium battery production, comprising:

[0032] A base 1, a lithium battery conveying mechanism 4 is provided on the front side of the top of the base 1, and a first baffle 2 and a third baffle 3 are fixedly installed on both sides of the rear side of the top of the base 1;

[0033] The rubber tapping assembly 5 is arranged at the rear side of the top of the base 1. The rubber tapping assembly 5 includes a motor 501, a rotating drum 502, a moving rod 503, a connecting block 504, a first spring 505, a moving sleeve 506, a vertical rod 507, a sleeve 508, a cross bar 509 and a cutting knife 510. The motor 501 is fixedly installed at the rear side of the top of the base 1. The output shaft of the motor 501 is fixedly connected to the rotating drum 502. The inner cavity of the rotating drum 502 is movably sleeved with the moving rod 503. One end of the moving rod 503 is fixedly connected to the connecting block 504. The outer side of the rod 503 is movably sleeved with a first spring 505, and the two ends of the first spring 505 are respectively connected to the rotating cylinder 502 and the connecting block 504, and the connecting block 504 is rotatably connected to a movable sleeve 506, and the inner cavity of the movable sleeve 506 is movably sleeved with a vertical rod 507, and a sleeve 508 is fixedly installed on the top of the vertical rod 507, and a cross bar 509 is movably sleeved in the inner cavity of the sleeve 508, and the two ends of the cross bar 509 are respectively fixedly connected to the first baffle 2 and the third baffle 3, and a cutting knife 510 is fixedly installed on the front side of the movable sleeve 506;

[0034] The rear side of the first baffle plate 2 is provided with a transmission assembly 6, and the lithium battery conveying mechanism 4 is connected to the rubber tapping assembly 5 by the transmission assembly 6. The vertical rod 507 and the horizontal rod 509 are vertically distributed, and the front side of the cutting knife 510 is in contact with the rear side of the first baffle plate 2.

[0035] The motor 501 is used as a drive to drive the rotating drum 502 to rotate. Since the rotating drum 502 is connected to the vertical rod 507 by using the moving rod 503, the first spring 505, the connecting block 504, and the moving sleeve 506, and then connected to the cross bar 509 by using the sleeve 508 through the vertical rod 507, the cutting knife 510 on the moving sleeve 506 can be driven to move along the vertical rod 507 and the cross bar 509 in a square trajectory. When the cutting knife 510 is located below the vertical rod 507 and moves in a straight line, it is convenient to tap the lithium batteries on the first baffle 2, thereby improving the efficiency of tapping.

[0036] In one embodiment of the present invention, the lithium battery conveying mechanism 4 includes a support plate 401, a first rotating shaft 402, a first pulley 403, a first belt 404 and a placement seat 405. Two support plates 401 are fixedly installed on the front side of the top of the base 1, and the rear sides of the two support plates 401 are both rotatably connected to the first rotating shaft 402. The two first rotating shafts 402 are connected by a first pulley 403 and a first belt 404, and the outer side of the first belt 404 is fixedly connected to a placement seat 405.

[0037] In one embodiment of the present invention, the transmission assembly 6 includes a second rotating shaft 601, a second pulley 602, a second belt 603, an auxiliary block 604, a third pulley 605 and a third belt 606. The rear sides of the first baffle 2 and the third baffle 3 are both rotatably connected with the second rotating shaft 601. The two second rotating shafts 601 are connected by the second pulley 602 and the second belt 603. The outer side of the second belt 603 is fixedly connected with the auxiliary block 604. The rear side of the first rotating shaft 402 and the rear side of the first rotating shaft 402 are connected by the third pulley 605 and the third belt 606. The rear side of the movable sleeve 506 is fixedly installed with a first push plate 607. The second belt 603 is provided with a plurality of auxiliary blocks 604 evenly distributed along the outer side of the second belt 603, and the distance between two adjacent auxiliary blocks 604 is less than the length of the cross bar 509. The first push plate 607 is in an L shape as a whole, and the rear side of the first push plate 607 is on the same horizontal plane as the rear side of the auxiliary block 604.

[0038] The rubber tapping assembly 5 is connected to the lithium battery conveying mechanism 4 by using the transmission assembly 6. When the motor 501 drives the first push plate 607 to move upward and connect with the auxiliary block 604 on the second belt 603, the movable sleeve 506 can push the auxiliary block 604 to move when it moves horizontally along the cross bar 509 above the vertical rod 507, thereby driving the second belt 603 and the second rotating shaft 601 to rotate. Since the second rotating shaft 601 is connected to the first rotating shaft 402 by the third pulley 605 and the third belt 606, when the cutting knife 510 is located above the lithium battery conveying mechanism 4, it can drive the first belt 404 to move and transport the lithium batteries that need to be tapped to the cutting position.

[0039] In one embodiment of the present invention, the first belt 404 is provided with a plurality of evenly distributed placement seats 405 along the outer side of the first belt 404, and an arc groove is provided on the top of the placement seat 405. The arc groove is provided on the top of the placement seat 405, so that the lithium battery can be placed easily.

[0040] In one embodiment of the present invention, a waste glue arrangement assembly 7 is provided at the lower part of the first baffle 2, and the waste glue arrangement assembly 7 includes a second push plate 701, a telescopic rod 702, a gathering plate 703 and a second spring 704. The inner cavity at the lower part of the first baffle 2 is fixedly connected with the telescopic rod 702, and one side of the telescopic rod 702 is fixedly connected with the gathering plate 703. The outer side of the telescopic rod 702 is movably sleeved with the second spring 704, and the two ends of the second spring 704 are respectively connected to the first baffle 2 and the gathering plate 703. The bottom of the movable sleeve 506 is fixedly connected with the second push plate 701. One side of the second push plate 701 is located on the side of the gathering plate 703 close to the first baffle 2, and is in contact with the side of the gathering plate 703 close to the first baffle 2. By providing the waste glue arrangement assembly 7 on the first baffle 2, the movable sleeve 506 can drive the second push plate 701 to move when it moves horizontally under the vertical rod 507 for cutting. The movement of the second push plate 701 drives the gathering plate 703 to move, and the cut glue is gathered together for convenience of subsequent cleaning.

[0041] In one embodiment of the present invention, the cross section of the collecting plate 703 is U-shaped, and the collecting plate 703 is located below the vertical rod 507 and the cutting knife 510. The U-shaped cross section of the collecting plate 703 facilitates the collection of waste rubber and facilitates subsequent cleaning.

[0042] Working principle: When using this device, place the lithium battery that needs to be tapped on the top of the placement seat 405, and then use the external structure to fix the lithium battery, start the motor 501, and drive the rotating drum 502 to rotate. Since the rotating drum 502 is connected to the connecting block 504 by the moving rod 503 and the first spring 505, and the connecting block 504 is rotatably connected to the moving sleeve 506, and the moving sleeve 506 is sleeved on the outside of the vertical rod 507, and the vertical rod 507 is sleeved on the cross bar 509 by the sleeve 508, when the motor 501 is running, it can drive the moving sleeve 506 to move in a square trajectory;

[0043] When the lower part of the vertical rod 507 moves horizontally along the outer side of the cross rod 509, the cutting knife 510 is driven to move to cut the glue on the lithium battery. At this time, the second push plate 701 under the movable sleeve 506 pushes the gathering plate 703 to move together, and the second spring 704 and the telescopic rod 702 on the gathering plate 703 are stretched, so that the cut glue is gathered to one side of the top of the base 1. When the movable sleeve 506 moves from one end of the cross rod 509 to the other end, the movable sleeve 506 moves upward along the outer side of the vertical rod 507, and the second push plate 701 releases the push on the gathering plate 703. At this time, the gathering plate 703 is reset by the elastic force of the second spring 704.

[0044] The movable sleeve 506 continues to move upward, driving the first push plate 607 to move upward. After the first push plate 607 moves to the position where the auxiliary block 604 contacts, the motor 501 drives the movable sleeve 506 to move horizontally along the trajectory of the horizontal bar 509 on the upper part of the vertical rod 507. At this time, the first push plate 607 pushes the auxiliary block 604 to move horizontally, thereby driving the second pulley 602, the second rotating shaft 601 and the second belt 603 to rotate and move. Since the second rotating shaft 601 is connected to the first rotating shaft 402 by the third pulley 605 and the third belt 606, the first rotating shaft 402 is driven to rotate. Since the first rotating shaft 402 rotates, the first pulley 403 is driven to rotate, driving the first belt 404 to move, and driving the new lithium battery that needs to be tapped to move to the front side of the cutting knife 510, waiting for the movable sleeve 506 to move downward, and then moving horizontally for cutting, such reciprocating movement can realize automatic tapping of lithium batteries.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rubber tapping device for lithium battery production, characterized in that: include: A base (1), wherein a lithium battery conveying mechanism (4) is provided on the front side of the top of the base (1), and a first baffle (2) and a third baffle (3) are respectively fixedly mounted on both sides of the rear side of the top of the base (1); A rubber tapping assembly (5) is arranged on the rear side of the top of a base (1), and the rubber tapping assembly (5) comprises a motor (501), a rotating drum (502), a moving rod (503), a connecting block (504), a first spring (505), a moving sleeve (506), a vertical rod (507), a sleeve (508), a cross bar (509) and a cutting knife (510). The motor (501) is fixedly installed on the rear side of the top of the base (1), the output shaft of the motor (501) is fixedly connected to the rotating drum (502), the inner cavity of the rotating drum (502) is movably sleeved with the moving rod (503), one end of the moving rod (503) is fixedly connected to the connecting block (504), and the The outer side of the moving rod (503) is movably sleeved with a first spring (505), the two ends of the first spring (505) are respectively connected to the rotating drum (502) and the connecting block (504), the connecting block (504) is rotatably connected with a moving sleeve (506), the inner cavity of the moving sleeve (506) is movably sleeved with a vertical rod (507), the top of the vertical rod (507) is fixedly installed with a sleeve (508), the inner cavity of the sleeve (508) is movably sleeved with a cross bar (509), the two ends of the cross bar (509) are respectively fixedly connected to the first baffle plate (2) and the third baffle plate (3), and the front side of the moving sleeve (506) is fixedly installed with a cutting knife (510); A transmission assembly (6) is provided on the rear side of the first baffle (2), and the lithium battery conveying mechanism (4) is connected to the rubber tapping assembly (5) by means of the transmission assembly (6).

2. A rubber tapping device for lithium battery production according to claim 1, characterized in that: The lithium battery conveying mechanism (4) comprises a support plate (401), a first rotating shaft (402), a first pulley (403), a first belt (404) and a placement seat (405); two support plates (401) are fixedly mounted on the front side of the top of the base (1); the rear sides of the two support plates (401) are both rotatably connected to the first rotating shaft (402); the two first rotating shafts (402) are connected in transmission via a first pulley (403) and a first belt (404); and the outer side of the first belt (404) is fixedly connected to the placement seat (405).

3. A rubber tapping device for lithium battery production according to claim 2, characterized in that: The transmission assembly (6) comprises a second rotating shaft (601), a second pulley (602), a second belt (603), an auxiliary block (604), a third pulley (605) and a third belt (606); the rear sides of the first baffle plate (2) and the third baffle plate (3) are both rotatably connected with the second rotating shaft (601); the two second rotating shafts (601) are connected by transmission via the second pulley (602) and the second belt (603); the outer side of the second belt (603) is fixedly connected with the auxiliary block (604); the rear side of the first rotating shaft (402) and the rear side of the first rotating shaft (402) are connected by transmission via the third pulley (605) and the third belt (606); and the rear side of the movable sleeve (506) is fixedly installed with a first push plate (607).

4. A rubber tapping device for lithium battery production according to claim 3, characterized in that: The second belt (603) is provided with a plurality of auxiliary blocks (604) evenly distributed along the outer side of the second belt (603), and the distance between two adjacent auxiliary blocks (604) is less than the length of the crossbar (509).

5. A rubber tapping device for lithium battery production according to claim 3, characterized in that: The first push plate (607) is in an L-shape as a whole, and the rear side of the first push plate (607) and the rear side of the auxiliary block (604) are on the same horizontal plane.

6. A rubber tapping device for lithium battery production according to claim 2, characterized in that: The first belt (404) is provided with a plurality of placement seats (405) evenly distributed along the outer side of the first belt (404), and the top of the placement seat (405) is provided with an arc-shaped groove.

7. A rubber tapping device for lithium battery production according to claim 1, characterized in that: A waste rubber sorting component (7) is provided at the lower part of the first baffle plate (2), and the waste rubber sorting component (7) comprises a second push plate (701), a telescopic rod (702), a gathering plate (703) and a second spring (704). The inner cavity at the lower part of the first baffle plate (2) is fixedly connected with the telescopic rod (702), one side of the telescopic rod (702) is fixedly connected with the gathering plate (703), the outer side of the telescopic rod (702) is movably sleeved with the second spring (704), the two ends of the second spring (704) are respectively connected with the first baffle plate (2) and the gathering plate (703), and the bottom of the movable sleeve (506) is fixedly connected with the second push plate (701).

8. A rubber tapping device for lithium battery production according to claim 7, characterized in that: One side of the second push plate (701) is located on a side of the gathering plate (703) close to the first baffle (2), and is in contact with a side of the gathering plate (703) close to the first baffle (2).

9. A rubber tapping device for lithium battery production according to claim 7, characterized in that: The cross section of the gathering plate (703) is in a U shape, and the gathering plate (703) is located below the vertical rod (507) and the cutting knife (510).

10. A rubber tapping device for lithium battery production according to claim 1, characterized in that: The vertical rod (507) and the horizontal rod (509) are vertically arranged, and the front side of the cutting knife (510) is in contact with the rear side of the first baffle (2).