A device for continuous laser cutting of lithium strips and its use method

Abstract

The present invention discloses an apparatus for continuous laser cutting of lithium ribbon and its use method, relating to the field of lithium metal battery processing technology. The apparatus comprises a payout and a take-up shaft, with a vacuum inlet roller, a laser cutting mechanism, a vacuum outlet roller, and a discharge assembly disposed sequentially between the payout and take-up shafts. A release film is connected between the payout and take-up shafts, with the lithium ribbon to be cut adhered to the upper surface of the release film. The vacuum inlet roller and the vacuum outlet roller jointly pull the release film forward from the payout to the take-up shaft. During this process, the laser cutting mechanism cuts the lithium ribbon adhered to the upper surface of the release film into multiple lithium sheets, and the discharge assembly transfers and collects the cut lithium sheets from the upper surface of the release film. This apparatus can mass-produce lithium metal pole pieces, with high production efficiency, stable equipment, fast speed, high cutting accuracy, easily controllable product size, and high 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 aerospace, low-altitude economy, military and other fields.

[0003] The lithium ribbons currently used in lithium metal batteries are typically 10-200μm thick. They are extremely thin and soft, easily deformed and torn, and easily adhere to various materials. Therefore, the production of lithium metal batteries is difficult to mechanize and automate. 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] Currently, the main cutting processes for lithium battery pole pieces include: 1. Disc shearing, which utilizes the rolling shear principle to slit rolled lithium battery positive and negative pole pieces with a thickness of 10-200μm. 2. Metal die punching, which utilizes the extremely small gap between the punch and the lower die to cut the lithium battery pole pieces. Both disc slitting and die cutting are subject to tool wear issues, which can easily lead to process instability, resulting in extremely poor pole piece cutting quality and reduced battery performance. Due to the inherent characteristics of lithium metal, there are problems with the metal sticking to the knife, resulting in short tool life, difficulty in repair, and easy chipping. Another problem is that when performing special-shaped cutting, changing the tool is very troublesome, and the tool cannot be universal. Summary of the Invention

[0005] The object of the present invention is to provide an apparatus for continuous laser cutting of lithium strips and a method for using the apparatus, which aims 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:

[0007] A device for continuous laser cutting of lithium strips, comprising a unwinding shaft and a rewinding shaft, wherein a vacuum inlet roller, a laser cutting mechanism, a vacuum outlet roller and a discharge assembly are sequentially arranged between the unwinding shaft and the rewinding shaft, a release film is connected between the unwinding shaft and the rewinding 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 rewinding shaft, and during the process of the release film moving forward from the unwinding shaft to the rewinding shaft, the laser cutting mechanism cuts the lithium strip adhered to the upper surface of the release film into multiple lithium sheets, and the discharge assembly transfers and collects the cut lithium sheets from the upper surface of the release film.

[0008] As a further solution of the present invention: the vacuum inlet pulling roller and the vacuum outlet 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. 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.

[0009] 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 2, an outer cylinder 2 and a negative pressure positive pressure switching component, the unloading inner cylinder is arranged at the center of the sealed chamber 2, the outer cylinder 2 is rotatably sleeved on the outer periphery of the sealed chamber 2, a partition is provided 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 2 is provided with hole 2, and the negative pressure positive pressure switching component is fixedly provided on the outer periphery of the unloading inner cylinder.

[0010] As a further solution of the present invention: the negative pressure-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 arranged 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.

[0011] As a further solution of the present invention, the angle between the air nozzle and the release film is 15-70 degrees, and the air nozzle sweeps back and forth between the left and right sides of the gap between the lithium sheet and the release film.

[0012] 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 roller and the vacuum outlet 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 tab shape, and the laser 2 cuts the lithium ribbon with the tab shape cut into lithium sheets.

[0013] As a further solution of the present invention: it also includes an encoder for measuring the running speed of the lithium belt.

[0014] As a further solution of the present invention: a tension roller 1 is provided between the unwinding shaft and the vacuum pulling roller; a tension roller 2 is provided between the unloading assembly and the rewinding shaft.

[0015] As a further solution of the present invention: a plurality of support rollers are evenly arranged between the vacuum input pulling roller and the vacuum output pulling roller; and a passing roller is arranged between the unloading assembly and the vacuum output pulling roller.

[0016] The present invention also provides a method for using the above-mentioned device for continuous laser cutting of lithium strips, comprising the following steps:

[0017] 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;

[0018] S2, the equipment starts according to the preset program. During the release film feeding process, 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 tab with the first knife, and the laser cutting mechanism cuts the lithium ribbon into individual lithium sheets with the second knife.

[0019] S3, the unloading assembly transfers and collects the cut lithium sheets from the upper surface of the release film.

[0020] Beneficial effects of the present invention:

[0021] (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 is laser cut into lithium sheets in two steps: the first step is to cut into the shape of the tabs, and the second step is 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.

[0022] (2) The present invention uses a release film as a support body for the lithium belt to travel in the equipment, thereby avoiding problems such as deformation and wear of the lithium belt, not only improving the travel speed, but also solving abnormal problems such as metal lithium sticking to the roller;

[0023] (3) The present invention cuts the lithium ribbon twice, which reduces the process difficulty and can increase the tape 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.

[0024] (4) The continuous laser cutting lithium strip equipment of the present invention does not use a pressure roller during the strip feeding 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.

[0025] (5) The continuous laser cutting lithium strip equipment of the present invention transfers the cut lithium sheets through the 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

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic structural diagram of an apparatus for continuous laser cutting of lithium strips and a method for using the apparatus;

[0028] Figure 2a This is a schematic diagram of one side of the tab cutter using the laser cutting method of the present invention;

[0029] Figure 2b Schematic diagram of the second edge of the tab in the laser cutting method of the present invention;

[0030] Figure 3 This is a schematic diagram of the vacuum pulling roller structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the vacuum pull roller of the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the discharge roller of the present invention;

[0033] Figure 6 It is a schematic diagram of the internal structure of the discharge roller of the present invention.

[0034] 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, discharge roller; 11, laser 1; 12, CCD camera 1; 13, release film; 14, lithium ribbon; 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 part; 191, sleeve; 192, tripod bracket; 193, middle plate; 194, vacuum zone; 195, positive pressure zone. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they cannot be understood as limiting the present invention.

[0037] In addition, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] See also Figure 1-6 As shown, an embodiment of the present invention provides an apparatus for continuous laser cutting of lithium strips, comprising a reel 1 and a reel 8, wherein a vacuum inlet roller 3, a laser cutting mechanism, a vacuum outlet roller 5 and a discharge assembly are sequentially arranged between the reel 1 and the reel 8.

[0039] Among them, a 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. The vacuum inlet roller 3 and the vacuum outlet roller 5 jointly pull the release film 13 from the unwinding shaft 1 to move forward, and finally it is retracted by the reeling shaft 8. It is worth noting that the lithium ribbon 14 to be cut is adhered to the upper surface of the release film 13. The lithium ribbon 14 to be cut moves synchronously with the release film 13. Each layer of the lithium ribbon 14 is provided with a release film 13. The release film 13 can be, but is not limited to, PP or PET film. After the unwinding shaft 1 is unwound, the release film 13 acts as a support and is electrostatically adhered to the lithium ribbon 14. The release film 13 acts as a support to drive the lithium ribbon 14 to run in the equipment, avoiding the problem of deformation and wear of the lithium ribbon 14. This not only improves the running speed, but also solves abnormal problems such as metal lithium sticking to the roller. During the process of the release film 13 moving forward from the unwinding shaft 1 to the reeling shaft 8, the laser cutting mechanism cuts the lithium strip 14 adhered to the upper surface of the release film 13 into multiple 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.

[0040] Directions:

[0041] 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 rewinding shaft 8 as required.

[0042] 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.

[0043] 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 .

[0044] It is understood that the continuous laser cutting apparatus for lithium ribbon provided by the present invention also includes an encoder 9 for measuring the running speed of the lithium ribbon 14. A tension roller 1 (2) is also positioned between the unwinding shaft 1 and the vacuum inlet roller 3, and a tension roller 2 (18) is also positioned between the unloading assembly and the reel 8. Tension rollers 1 (2) and 18 control the ribbon tension. Several support rollers 4 are evenly spaced between the vacuum inlet roller 3 and the vacuum outlet roller 5 to support the lithium ribbon 14. A roller 6 is positioned between the unloading assembly and the vacuum outlet roller 5.

[0045] See also Figure 3 As shown, in one embodiment, the vacuum inlet puller 3 and the vacuum outlet puller 5 each include a vacuum inner cylinder 33, a sealed cavity 35, and an outer cylinder 31. The vacuum inner cylinder 33 is disposed at the center of the sealed cavity 35, and the outer cylinder 31 is rotatably sleeved around the outer periphery of the sealed cavity 35. The vacuum inner cylinder 33 is provided with air holes 34, and 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 cylinder 31 create a vacuum adsorption effect. Furthermore, the sealed cavity 35 effectively prevents air leakage from the holes 32. The vacuum inlet roller 3 and the vacuum outlet roller 5 are active rollers, which pull the release film 13 and the lithium sheet 15 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 The outer cylinder 31 and the vacuum inner cylinder 33 are separated. When the vacuum inlet roller 3 and the vacuum outlet roller 5 rotate, the outer cylinder 31 rotates and the vacuum inner cylinder 33 remains stationary.

[0046] See also Figure 1As shown, in one embodiment, the unloading assembly includes a unloading roller 10 and an air nozzle 7. Figure 5 As shown, the discharge roller 10 includes a discharge inner cylinder 103, a sealed chamber 108, an outer cylinder 101 and a negative pressure positive pressure switching member 19. The discharge inner cylinder 103 is set in 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 provided in 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 provided on the outer periphery of the unloading inner cylinder 103.

[0047] See also Figure 6 As shown, in one embodiment, the negative pressure-positive pressure switching component 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 set on the sleeve 191, and the intermediate plate 193 is set 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.

[0048] 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 0.1-0.8 MPa. The surface material of the outer cylinder 101 is high-strength nylon or Teflon. The diameter of the outer cylinder 101 is 100-800 mm, the diameter of the hole 102 is 0.5-5 mm, 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.

[0049] When the discharge roller 10 is in operation, the outer cylinder 101 rotates, while the inner discharge cylinder 103 and the negative-to-positive pressure switching element 19 remain stationary. The vacuum holes 106 in the vacuum chamber 104, the vacuum zone 194 within the triangular bracket 192, and the second hole 102 in the outer cylinder 101 cooperate to create a vacuum suction effect. Positive pressure is then created through the positive pressure holes 109 in the positive pressure chamber 105, the positive pressure zone 195 within the triangular bracket 192, and the second hole 102 in the outer cylinder 101. Furthermore, the sealed chamber 108 effectively prevents air leakage from the second hole 102. The discharge roller 10 peels the lithium sheet 15 from the release film 13 through vacuum suction. Then, the positive pressure releases the lithium sheet 15 from the discharge roller 10, allowing it to be collected and transferred by a robotic arm. 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. At the same time, it is equipped with an air nozzle 7. The air nozzle 7 uses dry and filtered compressed air with a moisture content of ≤30% and an air pressure of 0.1-0.8 MPa. The minimum inner diameter of the nozzle is 1-3 mm. 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 edges of the lithium sheet 15 from being torn when peeling off the release film 13.

[0050] 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, sequentially positioned between the vacuum inlet puller 3 and the vacuum outlet puller 5. The CCD camera 12, laser 11, CCD camera 2 17, and laser 2 16 are all positioned directly above the lithium ribbon 14 to be cut. The lasers are either continuous or pulsed. The CCD camera is used for dimensional measurement, coordinates with a deflection corrector to correct the orientation of the lithium ribbon 14, and performs surface quality checks on the lithium ribbon 14. Laser 11 first cuts the lithium ribbon 14 into the shape of the tabs, and laser 2 16 then cuts the lithium ribbon 14, which has been cut into tabs, into lithium sheets 15.

[0051] See also Figure 2a and Figure 2b As shown, the first laser cut continuously cuts the lithium ribbon 14 into the shape of the tab, and the second laser cut cuts the lithium sheet 15. There are two ways to laser cut the tab: side tab and edge tab. Cutting the lithium ribbon 14 in two steps reduces the process difficulty and can increase the tape feed speed. The two laser cuts do not overlap, which can improve the edge quality of the output lithium sheet 15. This method takes into account both production efficiency and product quality.

[0052] In summary, the present invention discloses an apparatus for continuously laser cutting a lithium ribbon 14, comprising a payout reel 1, a takeup reel 8, a vacuum inlet puller 3, a laser cutting mechanism, a vacuum outlet puller 5, and a discharge assembly. The lithium ribbon 14 is driven along a release film 13, and laser cutting is performed in two steps to form the lithium sheet 15: the first to create the tab shape, and the second to form the block. This apparatus is capable of mass-producing lithium metal electrode sheets, offering high production efficiency, stability, speed, and cutting accuracy, as well as easily controllable product dimensions and high slitting precision.

[0053] The above detailed description of the preferred embodiments of the present invention should not 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 patent 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); The vacuum inlet pulling roller (3) and the vacuum outlet pulling roller (5) both comprise a vacuum inner cylinder (33), a sealing cavity (35) and an outer cylinder (31), wherein 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), an air hole (34) is provided on the outer periphery of the vacuum inner cylinder (33), and a hole (32) is provided on the outer periphery of the outer cylinder (31); The unloading assembly includes a unloading roller (10) and an air nozzle (7), the unloading roller (10) includes an unloading inner cylinder (103), a sealing 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 sealing chamber (108), the outer cylinder (101) is rotatably sleeved on the outer periphery of the sealing chamber (108), and the unloading inner cylinder (103) A partition (107) is provided in the center, and the partition (107) divides the inner discharge cylinder (103) into a vacuum chamber (104) and a positive pressure chamber (105). The outer periphery of the inner discharge cylinder (103) is provided with a vacuum air hole (106) and a positive pressure air hole (109). The outer periphery of the second outer cylinder (101) is provided with a second hole (102). The negative pressure positive pressure switching member (19) is fixedly provided on the outer periphery of the inner discharge cylinder (103). 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).

2. The device for continuous laser cutting of lithium strip according to claim 1, 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 communicated with the vacuum chamber (104); and the positive pressure area (195) is communicated with the positive pressure chamber (105).

3. The device for continuous laser cutting of lithium strip according to claim 1, characterized in that: The angle between the air nozzle (7) and the release film (13) is 15-70 degrees, 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).

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

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

6. 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).

7. A method for using the device for continuous laser cutting of lithium strips according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, install 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, and during the tape-feeding 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 a tab shape with the first knife, and the laser cutting mechanism cuts the lithium ribbon (14) with the tab shape into individual lithium sheets (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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