Equipment for continuous laser cutting of lithium strip and use method of equipment

Abstract

The invention discloses equipment for continuous laser cutting of a lithium strip and a using method of the equipment, and relates to the technical field of lithium metal battery processing. Comprising an unwinding shaft and a winding shaft, a vacuum pull-in roller, a laser cutting mechanism, a vacuum pull-out roller and a discharging assembly are sequentially arranged between the unwinding shaft and the winding shaft, a release film is connected between the unwinding shaft and the winding shaft, and a lithium strip to be cut adheres to the upper surface of the release film. The vacuum inlet traction roller and the vacuum outlet traction roller jointly pull the release film to move forwards from the unwinding shaft to the winding shaft, in the process that the release film moves forwards from the unwinding shaft to the winding shaft, the laser cutting mechanism cuts a lithium strip adhering to the upper surface of the release film into a plurality of lithium pieces, and the discharging assembly transfers and collects the cut lithium pieces from the upper surface of the release film. The equipment can produce lithium metal pole pieces in batches, and is high in production efficiency, stable, high in speed, high in cutting precision, easy to control the product size and high in slitting precision.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium metal battery processing, and in particular to a device for continuously laser cutting lithium strips and a method for using the device. Background Art

[0002] Lithium metal batteries have the advantages of high energy density, high voltage platform, wide operating temperature range, stable discharge voltage and low self-discharge rate. They have been widely used in various fields, especially in aerospace, low-altitude economy, and military.

[0003] The lithium ribbons currently used in lithium metal batteries are usually 10-200μm thick. They are extremely thin and soft in texture, easy to deform and tear, and easy to bond to various materials. Therefore, it is difficult to mechanize and automate the production of lithium metal batteries. In addition, the chemical properties of metallic lithium are very active and it easily reacts chemically with water vapor in the air, so it can generally only be processed in a dry room or glove box.

[0004] At present, the cutting process of lithium battery pole pieces mainly adopts 1. Disc shearing uses the rolling shear principle to cut the positive and negative pole pieces of lithium battery rolled with a thickness of 10-200μm. 2. Hardware die punching, using the extremely small gap between the punch and the lower die to cut the lithium battery pole pieces. Both disc slitting and die cutting have the problem of tool wear, which can easily cause process instability, resulting in extremely poor pole piece cutting quality and battery performance degradation. Due to the inherent characteristics of lithium metal materials, there will be problems such as low tool life due to the sticking of lithium metal materials, which is difficult to repair and easy to cause tool collapse; another problem is that when doing special-shaped cutting, it is very troublesome to replace the tool, and the tool cannot be universal. Summary of the invention

[0005] The object of the present invention is to provide a device for continuous laser cutting of lithium strips and a method for using the same, aiming to solve at least one of the problems existing in the prior art.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A device for continuous laser cutting of lithium strips comprises a unwinding shaft and a reeling shaft, wherein a vacuum inlet roller, a laser cutting mechanism, a vacuum outlet roller and a discharging assembly are sequentially arranged between the unwinding shaft and the reeling shaft, a release film is connected between the unwinding shaft and the reeling shaft, the upper surface of the release film is adhered to the lithium strip to be cut, the vacuum inlet roller and the vacuum outlet roller jointly pull the release film forward from the unwinding shaft to the reeling shaft, and during the process of the release film moving forward from the unwinding shaft to the reeling shaft, the laser cutting mechanism cuts the lithium strip adhered to the upper surface of the release film into a plurality of lithium sheets, and the discharging assembly transfers and collects the cut lithium sheets from the upper surface of the release film.

[0007] As a further solution of the present invention: the vacuum input pulling roller and the vacuum output pulling roller both include a vacuum inner cylinder, a sealed cavity and an outer cylinder. The vacuum inner cylinder is arranged at the center of the sealed cavity, and the outer cylinder is rotatably sleeved on the outer periphery of the sealed cavity. An air hole is opened on the outer periphery of the vacuum inner cylinder, and a hole is opened on the outer periphery of the outer cylinder.

[0008] As a further solution of the present invention: the unloading component includes a unloading roller and an air nozzle, the unloading component includes a unloading roller and an air nozzle, the unloading roller includes a unloading inner cylinder, a sealed chamber II, an outer cylinder II and a negative pressure positive pressure switching component, the unloading inner cylinder is arranged at the center of the sealed chamber II, the outer cylinder II is rotatably sleeved on the outer periphery of the sealed chamber II, a partition is arranged at the center of the unloading inner cylinder, the partition divides the unloading inner cylinder into a vacuum chamber and a positive pressure chamber, the outer periphery of the unloading inner cylinder is provided with vacuum air holes and positive pressure air holes, the outer periphery of the outer cylinder II is provided with two holes, and the negative pressure positive pressure switching component is fixedly arranged on the outer periphery of the unloading inner cylinder.

[0009] As a further solution of the present invention: the negative pressure to positive pressure switching component includes a sleeve, a triangular bracket and an intermediate plate, the sleeve is fixedly mounted on the outer periphery of the unloading inner cylinder, the triangular bracket is fixedly mounted on the sleeve, the intermediate plate is arranged in the triangular bracket, and the intermediate plate divides the inside of the triangular bracket into a vacuum zone and a positive pressure zone, the vacuum zone is connected to the vacuum chamber, and the positive pressure zone is connected to the positive pressure chamber.

[0010] As a further solution of the present invention: the angle between the air nozzle and the release film is 15-70°, and the air nozzle scans back and forth between the left and right sides of the gap between the lithium sheet and the release film.

[0011] As a further solution of the present invention: the laser cutting mechanism includes a CCD camera 1, a laser 1, a CCD camera 2 and a laser 2 which are sequentially arranged between the vacuum inlet pulling roller and the vacuum outlet pulling roller, and the CCD camera 1, the laser 1, the CCD camera 2 and the laser 2 are all located directly above the lithium ribbon to be cut, the laser 1 cuts the lithium ribbon to be cut into a pole ear shape, and the laser 2 cuts the lithium ribbon with the pole ear shape cut into lithium sheets.

[0012] As a further solution of the present invention: it also includes an encoder for measuring the running speed of the lithium belt.

[0013] As a further solution of the present invention: a tension roller 1 is arranged between the unwinding shaft and the vacuum pulling roller; and a tension roller 2 is arranged between the unloading assembly and the winding shaft.

[0014] As a further solution of the present invention: a plurality of support rollers are evenly arranged between the vacuum inlet pulling roller and the vacuum outlet pulling roller; and a passing roller is arranged between the unloading assembly and the vacuum outlet pulling roller.

[0015] The present invention also provides a method for using the above-mentioned device for continuously laser cutting lithium strips, comprising the following steps: S1, install the lithium ribbon to be cut which is adhered to the release film between the unwinding shaft and the rewinding shaft as required; S2, the equipment starts according to the preset program. During the feeding process of the release film, the laser cutting mechanism cuts the lithium ribbon adhered to the upper surface of the release film into lithium sheets arranged in sequence. During the cutting process, the laser cutting mechanism cuts the lithium ribbon into the shape of the pole ear with the first knife, and the laser cutting mechanism cuts the lithium ribbon into the shape of the pole ear into single lithium sheets with the second knife; S3, the unloading assembly transfers and collects the cut lithium sheets from the upper surface of the release film.

[0016] Beneficial effects of the present invention: (1) The present invention discloses a device for continuous laser cutting of lithium strips, including a reel, a reel, a vacuum inlet roller, a laser cutting mechanism, a vacuum outlet roller and a discharge assembly. The lithium strip follows the release film transmission, and the lithium strip is laser cut twice to form the lithium strip. The first time, the strip is cut into the shape of the pole ear, and the second time, the strip is cut into blocks. This device can mass-produce lithium metal pole pieces, with high production efficiency, stable equipment, fast speed, high cutting accuracy, easy control of product size and high cutting accuracy; (2) The present invention uses a release film as a support body for the belt in the device, avoiding the problems of deformation and wear of the lithium belt, not only improving the belt speed, but also solving the abnormal problems such as metal lithium sticking to the roller; (3) The present invention cuts the lithium strip twice, which reduces the process difficulty and can increase the strip speed. In addition, the paths of the two laser cuttings are not repeated, which can improve the edge quality of the output lithium sheet. This method takes into account both production efficiency and product quality. (4) The continuous laser cutting lithium belt equipment of the present invention does not use a pressure roller during the belt conveying process, and no roller contacts the lithium sheet. This structure not only solves the problem of lithium sticking but also improves the appearance quality of the lithium sheet. The active roller adopts a vacuum traction roller, which can generate vacuum at the part in contact with the release film, and no vacuum at other positions, which effectively reduces air leakage and improves the stability of the equipment. (5) The continuous laser cutting lithium strip equipment of the present invention transfers the cut lithium sheets through a discharge roller. The discharge roller rotates continuously without the need for a storage mechanism, which simplifies the equipment and makes the equipment speed more stable. The discharge roller has a vacuum area and a positive pressure area corresponding to the adsorption and detachment of the lithium sheets on the surface of the discharge roller, respectively. At the same time, it is equipped with an air nozzle to prevent the edges of the lithium sheets from being torn when they are peeled off the release film. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of a device for continuous laser cutting of lithium strips and a method for using the device; Figure 2a It is a schematic diagram of one side of the pole ear of the method of laser cutting the pole ear of the present invention; Figure 2b Schematic diagram of the second edge of the pole ear in the method of laser cutting the pole ear of the present invention; Figure 3 This is a schematic diagram of the vacuum pulling roller structure of the present invention; Figure 4 This is a schematic diagram of the internal structure of the vacuum pull roller of the present invention; Figure 5 It is a schematic diagram of the structure of the discharge roller of the present invention; Figure 6 It is a schematic diagram of the internal structure of the discharge roller of the present invention.

[0019] In the figure: 1, unwinding shaft; 2, tension roller 1; 3, vacuum inlet roller; 4, support roller; 5, vacuum outlet roller; 6, over roller; 7, air nozzle; 8, rewinding shaft; 9, encoder; 10, unloading roller; 11, laser 1; 12, CCD camera 1; 13, release film; 14, lithium belt; 15, lithium sheet; 31, outer cylinder 1; 32, hole 1; 33, vacuum inner cylinder; 34, air hole 1; 35, sealing chamber 1; 101, outer Cylinder 2; 102, hole 2; 103, unloading inner cylinder; 104, vacuum chamber; 105, positive pressure chamber; 106, vacuum pore; 107, partition; 108, sealing chamber 2; 109, positive pressure pore; 16, laser 2; 17, CCD camera 2; 18, tension roller 2; 19, negative pressure positive pressure switching member; 191, sleeve; 192, tripod bracket; 193, middle plate; 194, vacuum zone; 195, positive pressure zone. DETAILED DESCRIPTION

[0020] 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.

[0021] In the description of the present invention, it should be understood that terms such as "up", "down", "left", "right", "front" and "back" indicating directions or positional relationships are based on the directions 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 direction, and a specific direction structure and operation. Therefore, they should not be understood as limitations on the present invention.

[0022] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-6 As shown, an embodiment of the present invention provides a device for continuous laser cutting of lithium strips, including a reel 1 and a reel 8, between which a vacuum inlet roller 3, a laser cutting mechanism, a vacuum outlet roller 5 and a discharge assembly are sequentially arranged.

[0024] Among them, the release film 13 is connected between the unwinding shaft 1 and the reeling shaft 8, the release film 13 is unwound from the unwinding shaft 1, and the vacuum inlet roller 3 and the vacuum outlet roller 5 jointly pull the release film 13 to move forward from the unwinding shaft 1, and finally it is retracted by the reeling shaft 8. It is worth noting that the lithium tape 14 to be cut is adhered to the upper surface of the release film 13, and the lithium tape 14 to be cut moves synchronously with the release film 13. Each layer of the lithium tape 14 has a release film 13, and the release film 13 can be but not limited to PP or PET film. After the unwinding shaft 1 is unwound, the release film 13 is electrostatically adhered to the lithium tape 14 as a support body. The release film 13 is used as a support body to drive the lithium tape 14 to run in the equipment, which avoids the problem of deformation and wear of the lithium tape 14, not only improves the running speed, but also solves the abnormal problems such as metal lithium sticking to the roller. When the release film 13 moves forward from the unwinding shaft 1 to the reel 8, the laser cutting mechanism cuts the lithium strip 14 adhered to the upper surface of the release film 13 into a plurality of lithium sheets 15, and the unloading assembly transfers and collects the cut lithium sheets 15 from the upper surface of the release film 13. During the transmission process, the lithium sheets 15 must be on the upper layer of the release film 13 to prevent the roller 6 from scratching the lithium sheets 15.

[0025] Directions: First, the lithium ribbon 14 to be cut, which is adhered to the release film 13 , is installed between the unwinding shaft 1 and the winding shaft 8 as required.

[0026] Next, the controller controls the device to start according to the preset program. During the conveying process of the release film 13, the laser cutting mechanism cuts the lithium ribbon 14 adhered to the upper surface of the release film 13 into lithium sheets 15 arranged in sequence. During the cutting process, the laser cutting mechanism cuts the lithium ribbon 14 into the shape of the pole ear with the first knife, and the laser cutting mechanism cuts the lithium ribbon 14 with the shape of the pole ear into single lithium sheets 15 with the second knife.

[0027] Finally, the unloading assembly transfers and collects the cut lithium sheets 15 from the upper surface of the release film 13 , and the release film 13 is rolled up onto the winding shaft 8 .

[0028] It is understandable that the device for continuous laser cutting of lithium strip provided by the present invention further includes an encoder 9 for measuring the running speed of the lithium strip 14. A tension roller 1 2 is also arranged between the unwinding shaft 1 and the vacuum inlet roller 3, and a tension roller 2 18 is also arranged between the unloading assembly and the winding shaft 8. The tension roller 1 2 and the tension roller 2 18 control the tension of the strip. A plurality of support rollers 4 are evenly arranged between the vacuum inlet roller 3 and the vacuum outlet roller 5, and the plurality of support rollers 4 support the lithium strip 14, and a roller 6 is arranged between the unloading assembly and the vacuum outlet roller 5.

[0029] See also Figure 3 As shown, in one embodiment, the vacuum inlet pull-in roller 3 and the vacuum outlet pull-in roller 5 both include a vacuum inner cylinder 33, a sealing cavity 35 and an outer cylinder 31. The vacuum inner cylinder 33 is arranged at the center of the sealing cavity 35, and the outer cylinder 31 is rotatably sleeved on the outer periphery of the sealing cavity 35. The outer periphery of the vacuum inner cylinder 33 is provided with air holes 34, and the outer periphery of the outer cylinder 31 is provided with holes 32. The air holes 34 on the vacuum inner cylinder 33 and the holes 32 on the outer periphery of the outer cylinder 31 form a vacuum adsorption effect; in addition, the sealing cavity 35 effectively prevents the leakage of the holes 32. The vacuum inlet roller 3 and the vacuum outlet roller 5 are active rollers, which pull and drive the release film 13 and the lithium sheet 15 to move forward together. The vacuum inlet roller 3 and the vacuum outlet roller 5 rotate synchronously in the same direction, and adsorb the release film 13 on the surface of the outer cylinder 31 through negative pressure. The diameter of the vacuum inlet roller 3 and the vacuum outlet roller 5 is 250-600mm, the diameter of the hole 32 is 0.5-5mm, and the number of holes 32 per unit area is 2-10 / cm 2 , vacuum degree 0.3-0.8MPa. The outer cylinder 31 and the vacuum inner cylinder 33 are separated, and when the vacuum inlet pulling roller 3 and the vacuum outlet pulling roller 5 rotate, the outer cylinder 31 rotates and the vacuum inner cylinder 33 is fixed.

[0030] See also Figure 1 As shown, in one embodiment, the unloading assembly includes a unloading roller 10 and an air nozzle 7. Figure 5As shown, the unloading roller 10 includes an unloading inner cylinder 103, a sealed chamber 108, an outer cylinder 101 and a negative pressure positive pressure switching member 19. The unloading inner cylinder 103 is arranged at the center of the sealed chamber 108, and the outer cylinder 101 is rotatably sleeved on the outer periphery of the sealed chamber 108. Figure 6 As shown, a partition 107 is arranged at the center of the unloading inner cylinder 103, and the partition 107 divides the unloading inner cylinder 103 into a vacuum chamber 104 and a positive pressure chamber 105. The outer periphery of the unloading inner cylinder 103 is provided with a vacuum air hole 106 and a positive pressure air hole 109, and the outer periphery of the outer cylinder 101 is provided with a hole 102, and the negative pressure positive pressure switching component 19 is fixedly arranged on the outer periphery of the unloading inner cylinder 103.

[0031] See also Figure 6 As shown, in one embodiment, the negative pressure to positive pressure switching member 19 includes a sleeve 191, a triangular bracket 192 and an intermediate plate 193. The sleeve 191 is fixedly sleeved on the outer periphery of the unloading inner cylinder 103, the triangular bracket 192 is fixedly arranged on the sleeve 191, and the intermediate plate 193 is arranged in the triangular bracket 192. The intermediate plate 193 divides the inside of the triangular bracket 192 into a vacuum zone 194 and a positive pressure zone 195. The vacuum zone 194 is connected to the vacuum chamber 104, and the positive pressure zone 195 is connected to the positive pressure chamber 105.

[0032] During operation, the positive pressure chamber 105 is connected to compressed air, the vacuum chamber 104 is connected to a vacuum pump, and the connecting pipe is opened and closed by a solenoid valve. The moisture content of the compressed air is ≤30%, and the air pressure is 0.1-0.8MPa. The surface material of the outer tube 101 is high-strength nylon or Teflon, the diameter of the outer tube 101 is 100-800mm, the diameter of the hole 102 is 0.5-5mm, and the number of holes 102 per unit area is 1-10 / cm 2 , vacuum degree 0.3-0.8MPa, positive pressure 0.2-0.8MPa, outer cylinder 101 and unloading inner cylinder 103 are separated.

[0033] When the discharge roller 10 is running, the outer cylinder 101 rotates, and the discharge inner cylinder 103 and the negative pressure positive pressure switching member 19 are fixed. The vacuum air hole 106 on the vacuum chamber 104, the vacuum area 194 in the triangular bracket 192 and the hole 102 on the outer cylinder 101 form a vacuum adsorption effect; and the positive pressure air hole 109 on the positive pressure chamber 105, the positive pressure area 195 in the triangular bracket 192 and the hole 102 on the outer cylinder 101 form a positive pressure effect; in addition, the sealing chamber 108 effectively prevents the leakage of the hole 102. The discharge roller 10 peels the lithium sheet 15 from the release film 13 through vacuum adsorption, and then separates the lithium sheet 15 from the discharge roller 10 through positive pressure, and collects and transfers it through a robot. The unloading roller 10 rotates continuously without a material storage mechanism, which simplifies the equipment and makes the equipment speed more stable. The unloading roller 10 has a vacuum area and a positive pressure area corresponding to the adsorption and detachment of the lithium sheet 15 on the surface of the unloading roller 10, respectively, and is equipped with an air nozzle 7. The air nozzle 7 uses dry and filtered compressed air, the moisture content of the compressed air is ≤30%, the air pressure is 0.1-0.8MPa, the minimum inner diameter of the nozzle is 1-3mm, and the angle between the air nozzle 7 and the release film 13 is 15-70°. The air nozzle 7 sweeps back and forth on the left and right sides of the gap between the lithium sheet 15 and the release film 13 to prevent the edge of the lithium sheet 15 from being torn when peeling off the release film 13.

[0034] See also Figure 1 As shown, in one embodiment, the laser cutting mechanism includes a CCD camera 12, a laser 11, a CCD camera 2 17 and a laser 2 16 which are sequentially arranged between the vacuum inlet pull roller 3 and the vacuum outlet pull roller 5, and the CCD camera 12, the laser 11, the CCD camera 2 17 and the laser 2 16 are all located directly above the lithium strip 14 to be cut. The laser type is a continuous laser or a pulsed laser, and the CCD camera is used to measure the size, cooperate with the deviation corrector to correct the direction of the lithium strip 14, and perform NG inspection on the surface of the lithium strip 14. The laser 11 first cuts the lithium strip 14 to be cut into a tab shape, and the laser 2 16 then cuts the lithium strip 14 with the tab shape cut into lithium sheets 15.

[0035] See also Figure 2a and Figure 2b As shown, the first cutter continuously laser cuts the lithium strip 14 to cut out the shape of the pole ear, and the second cutter laser cuts the lithium sheet 15. There are two ways to laser cut the pole ear, namely, the side pole ear and the edge pole ear. Cutting the lithium strip 14 twice reduces the process difficulty and can increase the tape speed. The paths of the two laser cuttings are not repeated, which can improve the edge quality of the output lithium sheet 15. This method takes into account both production efficiency and product quality.

[0036] In summary, the present invention discloses a device for continuous laser cutting of lithium strip 14, including an unwinding shaft 1, a reeling shaft 8, a vacuum inlet roller 3, a laser cutting mechanism, a vacuum outlet roller 5 and a discharge assembly. The lithium strip 14 follows the release film 13 transmission, and the lithium sheet 15 is formed by laser cutting twice, the first time to cut out the ear shape, and the second time to cut into blocks. This device can mass-produce lithium metal pole pieces, with high production efficiency, stable equipment, fast speed, high cutting accuracy, easy control of product size and high cutting accuracy.

[0037] The above is a detailed description of the preferred embodiments of the present invention, which cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A device for continuous laser cutting of lithium strips, comprising a reel (1) and a reel (8), characterized in that A vacuum inlet roller (3), a laser cutting mechanism, a vacuum outlet roller (5) and a discharge assembly are sequentially arranged between the unwinding shaft (1) and the rewinding shaft (8); a release film (13) is connected between the unwinding shaft (1) and the rewinding shaft (8); a lithium strip (14) to be cut is adhered to the upper surface of the release film (13); the vacuum inlet roller (3) and the vacuum outlet roller (5) jointly pull the release film (13) forward from the unwinding shaft (1) to the rewinding shaft (8); in the process of the release film (13) moving forward from the unwinding shaft (1) to the rewinding shaft (8), the laser cutting mechanism cuts the lithium strip (14) adhered to the upper surface of the release film (13) into a plurality of lithium sheets (15); and the discharge assembly transfers and collects the cut lithium sheets (15) from the upper surface of the release film (13).

2. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: The vacuum inlet pulling roller (3) and the vacuum outlet pulling roller (5) both comprise a vacuum inner cylinder (33), a sealed cavity (35) and an outer cylinder (31); the vacuum inner cylinder (33) is arranged at the center of the sealed cavity (35); the outer cylinder (31) is rotatably sleeved on the outer periphery of the sealed cavity (35); an air hole (34) is opened on the outer periphery of the vacuum inner cylinder (33); and a hole (32) is opened on the outer periphery of the outer cylinder (31).

3. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: The unloading assembly comprises a unloading roller (10) and an air nozzle (7); the unloading roller (10) comprises an unloading inner cylinder (103), a sealed chamber (108), an outer cylinder (101) and a negative pressure / positive pressure switching member (19); the unloading inner cylinder (103) is arranged at the center of the sealed chamber (108); the outer cylinder (101) is rotatably sleeved on the outer periphery of the sealed chamber (108); the unloading inner cylinder (103) A partition (107) is arranged at the center, and the partition (107) divides the inner tube (103) of the discharge material into a vacuum chamber (104) and a positive pressure chamber (105). The outer periphery of the inner tube (103) of the discharge material is provided with a vacuum air hole (106) and a positive pressure air hole (109). The outer periphery of the second outer tube (101) is provided with a second hole (102). The negative pressure positive pressure switching member (19) is fixedly arranged on the outer periphery of the inner tube (103).

4. The device for continuous laser cutting of lithium strip according to claim 3 is characterized in that: The negative pressure / positive pressure switching member (19) comprises a sleeve (191), a triangular bracket (192) and an intermediate plate (193); the sleeve (191) is fixedly sleeved on the outer periphery of the unloading inner cylinder (103); the triangular bracket (192) is fixedly arranged on the sleeve (191); the intermediate plate (193) is arranged in the triangular bracket (192); the intermediate plate (193) divides the inside of the triangular bracket (192) into a vacuum area (194) and a positive pressure area (195); the vacuum area (194) is connected to the vacuum chamber (104); and the positive pressure area (195) is connected to the positive pressure chamber (105).

5. The device for continuous laser cutting of lithium strip according to claim 3 is characterized in that: The angle between the air nozzle (7) and the release film (13) is 15-70°, and the air nozzle (7) sweeps back and forth on the left and right sides of the gap between the lithium sheet (15) and the release film (13).

6. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: The laser cutting mechanism comprises a CCD camera 1 (12), a laser 1 (11), a CCD camera 2 (17) and a laser 2 (16) which are sequentially arranged between the vacuum inlet pulling roller (3) and the vacuum outlet pulling roller (5), and the CCD camera 1 (12), the laser 1 (11), the CCD camera 2 (17) and the laser 2 (16) are all located directly above the lithium strip (14) to be cut, the laser 1 (11) cuts the lithium strip (14) to be cut into a tab shape, and the laser 2 (16) cuts the lithium strip (14) with the tab shape cut into lithium sheets (15).

7. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: It also includes an encoder (9) for measuring the running speed of the lithium belt (14).

8. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: A tension roller one (2) is arranged between the unwinding shaft (1) and the vacuum pulling roller (3); and a tension roller two (18) is arranged between the unloading assembly and the winding shaft (8).

9. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: A plurality of support rollers (4) are evenly arranged between the vacuum inlet pulling roller (3) and the vacuum outlet pulling roller (5); and a passing roller (6) is arranged between the unloading assembly and the vacuum outlet pulling roller (5).

10. A method for using a device for continuous laser cutting of lithium strip according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, installing the lithium ribbon (14) to be cut, which is adhered to the release film (13), between the unwinding shaft (1) and the rewinding shaft (8) as required; S2, the equipment is started according to a preset program. During the tape feeding process of the release film (13), the laser cutting mechanism cuts the lithium tape (14) adhered to the upper surface of the release film (13) into lithium sheets (15) arranged in sequence. During the cutting process, the laser cutting mechanism cuts the lithium tape (14) into a tab shape with the first knife, and the laser cutting mechanism cuts the lithium tape (14) into a tab shape into a single lithium sheet (15) with the second knife. S3, the unloading assembly transfers and collects the cut lithium sheets (15) from the upper surface of the release film (13).

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