Lithium battery current collector unwinding and splicing method and unwinding and splicing device

Abstract

The application discloses a lithium battery current collector unwinding and splicing method and a lithium battery current collector unwinding and splicing device. The lithium battery current collector unwinding and splicing method adopts a hot melting splicing mode to realize splicing of new and old material belts, has high splicing strength, good stability, and effectively improves the production quality of lithium battery pole pieces. The lithium battery current collector unwinding and splicing device comprises an unwinding unit, a three-axis traction deviation rectifying system, a splicing and belt breaking system, a station switching system, a tension matching system and a control logic system, the splicing and belt breaking system is arranged on the unwinding discharge side of the unwinding unit along the advancing direction of the unwound material belt; the three-axis traction deviation rectifying system is arranged between the unwinding discharge side of the unwinding unit and the feeding side of the splicing and belt breaking system; the three-axis traction deviation rectifying system comprises a traction head and a traction driving assembly, the traction driving assembly is in transmission connection with the traction head and drives the traction head to move. The lithium battery current collector unwinding and splicing device can realize automatic splicing with high efficiency, high stability and high strength.

Description

Technical Field

[0001] This invention relates to the technical field of lithium battery electrode production and processing equipment, specifically to a method and equipment for unwinding and splicing lithium battery current collectors. Background Technology

[0002] In the production of lithium battery electrode sheets, the unwound material strip in coating and other unwinding operations can achieve continuous production by splicing the strip, enabling subsequent processes to operate without stopping the machine and ensuring high production efficiency.

[0003] The unwinding mechanism of existing lithium battery electrode coating machines involves an automated guided vehicle (AGV) or manual transport of a single roll of current collector placed at the unwinding unit on one side of the unwinding turret. The tape is then manually applied. The turret rotates, raising the swing arm to a waiting position. Upon receiving a tape receiving signal, the unwinding unit starts rotating at a matching linear speed. The lower swing arm roller, via a cylinder, lifts and presses the nearly used tape onto the new roll of tape, completing the automatic application. Simultaneously, the cutter cuts the tape, and the new roll is in normal working condition. The remaining roll is then removed by the AGV or manually. This method and corresponding equipment are common processes and equipment in the field of lithium battery automation, with relatively stable transitions between actions. However, it also has drawbacks, such as the need for manual tape application, resulting in high labor and consumable costs and a risk of tape breakage. Furthermore, the tape affects the cutter's lifespan and cut quality during subsequent slitting. In addition, it suffers from complex structure, difficult control, and high manufacturing costs. Summary of the Invention

[0004] The purpose of this invention is to address the problems of high cost, easy breakage, and reduced electrode production quality in existing lithium battery electrode unwinding and splicing equipment, and to provide a lithium battery current collector unwinding and splicing method. This unwinding and splicing method uses a hot-melt welding method to splice new and old material strips, resulting in high splicing strength, good stability, and effectively improving the production quality of lithium battery electrodes.

[0005] The present invention also aims to provide a lithium battery current collector unwinding and splicing device. This unwinding and splicing device has a three-axis traction correction system and an instantaneous heat-melting device sequentially arranged on the discharge side of the unwinding system along the feeding direction, enabling efficient, highly stable, and high-strength automatic splicing.

[0006] The objective of this invention is achieved through the following technical solution.

[0007] A method for unwinding and splicing a lithium battery current collector includes the following steps:

[0008] S1. At least two unwinding units shall unwind roll A and roll B in sequence.

[0009] S2, Work on old rolls of material A, new rolls of material B awaiting completion.

[0010] The three-axis traction and correction system corresponding to roll A is in the zero position, waiting for the new roll A. The three-axis traction and correction system corresponding to roll B is in the adsorption traction position, capturing and adsorbing the new roll head that falls from the unwinding unit of roll B through the electrostatic suction head. The pressing roller corresponding to roll A is in the working position to ensure uniform tension distribution when roll A is working. The pressing roller corresponding to roll B is in the zero position to avoid the working range of roll A. The station switching system is in the position corresponding to roll B to prepare for the connection between the old roll A and the head of roll B. The cutter corresponding to roll A is in the zero position, waiting for the tape cutting operation. The cutter corresponding to roll B is in the zero position to avoid the working range of roll A. The tension matching system is in the working position to release the tension of roll A when it enters the working state and maintain the stable tension adjustment capability of roll A in the working state.

[0011] S3. Connect the old roll of material A to the new roll of material B.

[0012] The three-axis traction and correction system for roll A remains unchanged. The three-axis traction and correction system for roll B performs online correction and alignment on the new roll head of roll B to align it with the old roll of roll A. Combined with the rotation of the corresponding unwinding unit, it is pulled to the adsorption waiting position. The pressing roller for roll A remains unchanged. The pressing roller for roll B extends to the tape receiving position to press the new roll head of roll B at the adsorption waiting position with the old roll of roll A in operation and transport them together to the station switching system. The station switching system provides instantaneous heat melting for the old roll of roll A and the roll head of roll B. The cutter for roll A extends to the working position to cut off the tail of the old roll of roll A. The cutter for roll B remains unchanged. The tension matching system extends to the tape receiving position to provide sufficient tension adjustment space when the new roll of roll B enters the working state.

[0013] S4. New rolls of material A are awaiting processing; old rolls of material B are being worked on.

[0014] The three-axis traction and correction system corresponding to roll A is in the adsorption traction position, capturing and adsorbing the new roll head that falls from the unwinding unit of roll A through the electrostatic suction head. The three-axis traction and correction system corresponding to roll B returns to the zero position to enter the next roll change cycle. The pressing roller corresponding to roll A returns to the zero position to avoid the working range of roll B. The pressing roller corresponding to roll B extends to the working position to ensure uniform tension distribution when roll B is working. The station switching system changes to the position corresponding to roll A to prepare for the connection between the old roll B and the roll head of roll A. The cutter corresponding to roll A returns to the zero position to avoid the working range of roll B and enters the next roll breaking cycle. The cutter corresponding to roll B remains unchanged. The tension matching system returns to the working position to release the tension of roll B when it enters the working state and maintains the stable tension adjustment capability of roll B in the working state.

[0015] S5. Connect the new roll of material A to the old roll of material B.

[0016] The three-axis traction correction system corresponding to roll A performs online correction and alignment of the new roll head of roll A to align it with the old roll of roll B, and combines it with the unwinding unit to rotate and pull it to the adsorption waiting position. The three-axis traction correction system corresponding to roll B remains unchanged. The pressing roller corresponding to roll A extends to the tape receiving position to press the new roll head of roll A in the adsorption waiting position with the old roll of roll B in operation and transport them together to the station switching system. The pressing roller corresponding to roll B remains unchanged. The station switching system provides instantaneous heat melting for the old roll of roll B and the roll head of roll A. The cutter corresponding to roll A remains unchanged. The cutter corresponding to roll B extends to the working position to cut off the tail of the old roll of roll B. The tension matching system extends to the tape receiving position to provide sufficient tension adjustment space when the new roll of roll A enters the working state.

[0017] S6. Work on old rolls of material A, while new rolls of material B await.

[0018] The three-axis traction and correction system corresponding to roll A returns to the zero position to enter the next roll change cycle. The three-axis traction and correction system corresponding to roll B extends to the adsorption and traction position to capture and adsorb the new roll head that falls from the unwinding unit of roll B through the electrostatic suction head. The pressing roller corresponding to roll A extends to the working position to make the tension distribution of roll A more uniform during operation. The pressing roller corresponding to roll B returns to the zero position to avoid the working range of roll A. The station switching system changes to the position corresponding to roll B to prepare for the connection between the old roll A and the roll head of roll B. The cutter corresponding to roll A remains unchanged. The cutter corresponding to roll B returns to the zero position to avoid the working range of roll B and enters the next roll break cycle. The tension matching system returns to the working position to release the tension of roll A when it enters the working state and maintains the stable tension adjustment capability of roll A during the working state.

[0019] S7, reciprocating cycle S3-S6, to achieve automatic unwinding and tape splicing.

[0020] In a preferred embodiment, the combined strips after welding in S3 and S5 are cooled by air.

[0021] A lithium battery current collector unwinding and splicing device includes:

[0022] At least two unwinding units, each unwinding unit having an independent unwinding shaft;

[0023] A tape splicing and breaking system is disposed on the discharge side of the unwinding unit along the forward direction of the unwinding tape; the tape splicing and breaking system includes a cutter assembly and a tape splicing feed roller assembly;

[0024] A station switching system is located on the discharge side of the tape splicing and breaking system along the forward direction of the unwinding tape; the station switching system includes an instantaneous heat-melting device that can be moved and switched to correspond to at least two unwinding units respectively.

[0025] At least two sets of three-axis traction correction systems, corresponding to at least two of the unwinding shafts, are arranged between the unwinding discharge side of the unwinding unit and the feeding side of the station switching system along the forward direction of the unwinding strip; the three-axis traction correction system includes a traction head and a traction drive assembly, the traction drive assembly being connected to the traction head and driving the traction head to move.

[0026] A tension matching system is installed on the discharge side of the station switching system;

[0027] And the control logic system, which uses program control for automatic unwinding and tape splicing.

[0028] In a preferred embodiment, the unwinding shaft is mounted on the positioning mounting plate and is driven to extend and retract relative to the positioning mounting plate by a positioning drive component.

[0029] In a preferred embodiment, the traction head includes an electrostatic suction head.

[0030] In a preferred embodiment, the traction drive assembly includes an X-axis drive component, a Y-axis drive component, and a Z-axis drive component;

[0031] The traction head is connected to the output end of the Y-axis drive component and is driven by the Y-axis drive component to move telescopically in the Y-axis direction; the Y-axis drive component is slidably mounted on the X-axis track and is driven by the X-axis drive component to slide in the X-axis direction; the X-axis drive component is slidably mounted on the Z-axis track and is driven by the Z-axis drive component to slide in the Z-axis direction.

[0032] In a preferred embodiment, along the forward direction of the unwound conveyor belt, the cutter assembly is disposed between the three-axis traction correction system and the feed side of the instantaneous hot melt device;

[0033] The number of the cutting assemblies corresponds to the number of unwinding shafts; each cutting assembly includes a cutting blade and a cutting blade drive unit that is connected to the cutting blade to drive the cutting blade to move and cut.

[0034] In a preferred embodiment, in any of the above-mentioned lithium battery current collector unwinding and splicing equipment, the splicing feed roller assembly is disposed on the feed side near the instantaneous hot-melt device; the splicing feed roller assembly includes a first pressing roller and a second pressing roller disposed opposite to each other, and the first pressing roller and the second pressing roller can move closer to each other or move further away from each other.

[0035] In a preferred embodiment, the lithium battery current collector unwinding and splicing equipment described in any of the above claims is provided with a cooling air knife device on the discharge side of the instantaneous hot melt device, and the cooling air knife device includes a first air knife and a second air knife arranged opposite to each other.

[0036] In a preferred embodiment, the lithium battery current collector unwinding and splicing device described in any of the above claims has a tension roller assembly on the discharge side of the instantaneous hot melt device. The tension roller assembly includes a tension roller and a tension roller drive for driving the tension roller to extend and retract.

[0037] In a further preferred embodiment, an over-roller is provided between the discharge side of the instantaneous heat-melting device and the feed side of the tension roller assembly.

[0038] In a preferred embodiment, in any of the above-mentioned lithium battery current collector unwinding and splicing equipment, the instantaneous hot-melt device is slidably disposed on the workstation switching track and is able to slide and move on the workstation switching track.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] The lithium battery current collector unwinding and splicing method of the present invention uses a hot-melt welding method to splice new and old material strips, abandoning the traditional method of splicing with adhesive tape, thus ensuring the strength and stability of the splice and improving the production quality of lithium battery electrodes. Moreover, air cooling is performed immediately after welding, which can avoid current collector strip breakage and tensile deformation, further ensuring the production quality of lithium battery electrodes.

[0041] The lithium battery current collector unwinding and splicing equipment of the present invention includes a three-axis traction correction system and an instantaneous heat-melting device sequentially arranged on the discharge side of the unwinding unit along the feeding direction. During splicing, the three-axis traction correction system precisely corrects and aligns the new and old material strips and pulls them to the instantaneous heat-melting device, which then achieves splicing by welding. This enables precise automatic splicing control, and the heat-melted splicing offers good stability, low cost, and high efficiency. The substrates of the same material are bonded together without impurities, ensuring splicing strength and stability, avoiding strip breakage and damage to the slitting equipment, and guaranteeing the production quality of lithium battery electrodes.

[0042] Furthermore, the instant heat-melting device is slidably mounted on the station switching track, and the feed side of the instant heat-melting device is equipped with a feed roller that can move with the station switching, which facilitates the corresponding switching of the instant heat-melting device when unwinding on different unwinding shafts, ensuring the stability of the feed and the smoothness of unwinding.

[0043] In addition, the instantaneous hot-melt device is equipped with a cooling air knife on the discharge side, which can apply air cooling to the strip after instantaneous fusion, thereby improving the strength of the strip after splicing and effectively preventing tensile deformation of the strip in the molten state, ensuring the strength and stability of the splice, and further ensuring the production quality of lithium battery electrode sheets. The unwinding unit adopts a telescopic avoidance structure design on the unwinding shaft, eliminating the need for a turret and thus reducing equipment costs.

[0044] The lithium battery current collector unwinding and splicing equipment of the present invention is an automatic unwinding and splicing system composed of a three-axis traction correction system, a splicing and breaking system, a station switching system, a tension matching system, an unwinding unit and a frame assembly. It has a reasonable spatial layout, a compact structure and an ingenious control method. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the lithium battery current collector unwinding and splicing device of the present invention in the splicing state in a specific embodiment;

[0046] Figure 2 This is a schematic diagram of the unwinding unit.

[0047] Figure 3 This is a top view schematic diagram of a three-axis traction correction system.

[0048] Figure 4 This is a front view schematic diagram of a three-axis traction correction system.

[0049] Figure 5 Schematic diagrams of a three-axis traction correction system under different working conditions;

[0050] Figure 6 A schematic diagram of the feed roller assembly in operation;

[0051] Figure 7 Schematic diagrams of the tape splicing and breaking system under different working conditions;

[0052] Figure 8 This is a schematic diagram of the workstation switching system;

[0053] Figure 9 A schematic diagram of the workstation switching system in different working states;

[0054] Figure 10 Schematic diagrams of the tension matching system under different operating states;

[0055] Figure 11 This is a flowchart illustrating the program control for unwinding and splicing of the lithium battery current collector in a specific embodiment of the present invention;

[0056] Figure 12 This is a schematic diagram of the connection state of material roll A after unwinding and material roll B after unwinding in a specific embodiment;

[0057] Figure 13 This is a schematic diagram of the structure of material roll B in the unwinding working state in a specific embodiment;

[0058] Figure 14 This is a schematic diagram of the connection state of material roll B after unwinding and material roll A after unwinding in a specific embodiment;

[0059] Figure 15 This is a schematic diagram of the structure of material roll A in the unwinding working state in a specific embodiment.

[0060] Figure labels: 1-Positioning mounting plate, 2-Unwinding unit, 21-Unwinding shaft, 22-Unwinding drive, 23-Avoidance drive, 24-Air inlet channel, 3-Three-axis traction and correction system, 31-Traction head, 32-X-axis track, 33-X-axis drive, 34-Y-axis drive, 35-Z-axis track, 4-Cutter assembly, 41-Cutter, 42-Cutter drive, 5-Feeding roller assembly, 51-First pressing roller, 53-First pressing roller drive, 52-Second pressing roller, 54-Second pressing roller drive, 6-Instantaneous heat melting device, 7-Cooling air knife device, 71-First air knife, 72-Second air knife, 8-Base, 9-Slider, 10-Station switching bracket, 11-Passing roller, 12-Tension roller assembly, 121-Tension roller, 122-Tension roller drive, 13-Collector. Detailed Implementation

[0061] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings, but the scope of protection and implementation of the present invention are not limited thereto.

[0062] In the specific embodiments described, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. The terms "first," "second," etc., are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention, let alone as indicating or implying relative importance.

[0063] Unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] Example 1

[0065] For the lithium battery current collector unwinding and splicing device of the present invention, please refer to [link to relevant documentation]. Figure 1As shown, it includes an unwinding system, a three-axis traction correction system, a tape splicing and breaking system, a station switching system, a tension matching system, and a frame assembly. The station switching system includes an instantaneous heat-melting device 6.

[0066] The unwinding system includes multiple independent unwinding units 2, such as at least two independent unwinding units, specifically two independently arranged on the left and right sides. Each independent unwinding unit 2 can unwind the current collector roll independently. During operation, one unwinding unit 2 is in the unwinding working state, while at least one other unwinding unit 2 is in the material preparation state. When the preceding unwinding unit 2 is about to finish unwinding, the new material strip unwound by the prepared unwinding unit 2 is connected to the old material strip unwound by the preceding unwinding unit 2, and enters the unwinding of the new material roll, realizing continuous unwinding production.

[0067] Specifically, the unwinding unit 2 includes an unwinding shaft 21, which may be, but is not limited to, an air shaft, and is provided with an air inlet channel 24 to inflate and clamp the material roll; furthermore, an unwinding drive 22 is provided to drive the unwinding shaft 21 to rotate during unwinding, and the unwinding drive 22 may be, but is not limited to, a servo motor. In a preferred embodiment, please refer to... Figure 2 As shown, the frame assembly includes a positioning mounting plate 1, and an unwinding shaft 21 is mounted on the positioning mounting plate 1. Specifically, the unwinding shaft 21 is mounted on the positioning mounting plate 1 and can slide telescopically along the thickness direction of the positioning mounting plate 1. Driven by the avoidance drive component 23, it can telescopically move relative to the positioning mounting plate 1. When unwinding, it can extend forward relative to the positioning mounting plate 1 to clamp the material roll and unwind it. When stopping work, it can retract backward relative to the positioning mounting plate 1 to avoid interference with feeding. It also eliminates the need for a turret, reducing equipment cost and complexity.

[0068] Optionally, the avoidance drive component 23 may be a pneumatic telescopic shaft, and the positioning mounting plate 1 is provided with a front and rear extending guide rail. The pneumatic telescopic shaft is connected to the unwinding unit 2 and drives the unwinding unit 2 to extend and retract.

[0069] The instantaneous heat-melting device 6 is optional, but not limited to, a heat-melting machine. Specifically, it is set on the unwinding and discharge side of the unwinding system along the forward direction of the unwinding strip. It can adaptively match the heating power according to the size of the current collector, material characteristics, and production line speed, so as to achieve the function of instantaneous heat-melting of the current collector during the conveying process without stopping the machine. The same material heat-melting method does not require other additional adhesive materials, resulting in high connection strength. In the specific embodiment shown, multiple unwinding units 2 are arranged horizontally above the instantaneous heat-melting device 6. During the unwinding operation, the unwinding strip travels from top to bottom, and when splicing, the strip passes through the instantaneous heat-melting device 6 below.

[0070] During the unwinding and splicing operation of current collector 13, when the preceding unwinding unit 2 is about to finish unwinding the A-material roll, the new B-material roll unwound by the prepared unwinding unit 2 and the old A-material roll unwound by the preceding unwinding unit 2 are matched at linear speed and pass together through the instantaneous heat-melting device 6. They are then heat-melted and welded by the instantaneous heat-melting device 6. Afterward, the tail of the old A-material roll is cut off, and the new B-material roll is unwound. The substrates of the same material are bonded together without impurities, ensuring the strength and stability of the splice, avoiding tape breakage and tape damage to the slitting equipment, and ensuring the production quality of lithium battery electrode sheets.

[0071] In a preferred embodiment, a three-axis traction correction system 3 is provided between the unwinding discharge side of the unwinding system and the feeding side of the instantaneous heat-melting device 6 along the forward direction of the unwinding strip. Multiple sets of the three-axis traction correction system 3 are configured, each corresponding to one of the multiple unwinding units 2. For example, the three-axis traction correction system 3 may include at least two sets corresponding to at least two unwinding shafts 21, specifically two sets arranged side-by-side and opposite to each other. The corresponding three-axis traction correction system 3 can traction and correct the strip unwound by the corresponding unwinding unit 2, aligning the new strip with the old strip during connection and ensuring the unwound strip is aligned before entering the instantaneous heat-melting device 6.

[0072] Specifically, the three-axis traction correction system 3 includes a traction head 31 and a traction drive assembly. The traction head 31 can be, but is not limited to, an electrostatic suction head or a vacuum suction head, preferably an electrostatic suction head, which can adsorb and fix the current collector. The traction drive assembly is connected to the traction head 31 and can drive the traction head 31 to move, correct, and align the current collector adsorbed and fixed by the traction head 31.

[0073] In a preferred embodiment, please refer to Figure 3 and Figure 4 As shown, the traction drive assembly includes an X-axis drive unit 33, a Y-axis drive unit 34, and a Z-axis drive unit. The X-axis drive unit 33 and the Z-axis drive unit are optional, but not limited to, telescopic cylinders or servo motors, and the Y-axis drive unit 34 is optional, but not limited to, a telescopic cylinder. The traction head 31 is connected to the output end of the Y-axis drive unit 34 and is driven by the Y-axis drive unit 34 to move telescopically in the Y-axis direction. The Y-axis drive unit 34 is slidably mounted on the X-axis track 32 and is driven by the X-axis drive unit 34 to slide along the X-axis track 32 in the X-axis direction. The X-axis drive unit 34 is slidably mounted on the Z-axis track 35 and is driven by the Z-axis drive unit to slide along the Z-axis track 35 in the Z-axis direction. Therefore, please refer to... Figure 5As shown, the traction head 31 is movable and adjustable in the X, Y, and Z axes, giving it three operating positions: zero position R0, adsorption traction position R1, and adsorption waiting position R2. For example, corresponding to the two three-axis traction and correction systems 3 of the left and right unwinding units 2, the left three-axis traction and correction system 3 has its traction head 31 having zero position R0', adsorption traction position R1', and adsorption waiting position R2', while the right three-axis traction and correction system 3 has its traction head 31 having zero position R0'', adsorption traction position R1'', and adsorption waiting position R2'. The waiting position R2'' allows the current collector to be adjusted along the X, Y, and Z axes after the traction head 31 adsorbs and fixes it. This adjustment enables the current collector to be aligned and aligned with the X-axis. The current collector is then pulled into the tape connection and disconnection system to wait for tape connection. After the new roll unwinding unit 2 rotates to match the linear speed of the old roll, the traction head 31 loses power, loses its adsorption force, and returns to the zero position. This system has functions of tape head adsorption, tape head traction, and alignment, which can meet the requirements for precise and stable control, conveying, and alignment quality of the new roll tape head during tape connection.

[0074] In the preferred embodiment, please refer to [the relevant documentation]. Figure 1 As shown, the tape breakage system includes a cutter assembly 4 positioned between the three-axis traction correction system 3 and the instantaneous heat-melting device 6 along the forward direction of the unwound tape. The cutter assembly 4 includes a cutter 41 and a cutter drive 42 connected to the cutter 41 to drive its movement and cutting. The cutter drive 42 can be, but is not limited to, a cylinder or a motor. Driven by the cutter drive 42, the cutter 41 can extend forward to approach the unwound path of the tape to cut it, or retract backward to reset.

[0075] Specifically, the cutter assembly 4 is configured in multiple sets, and each set of cutter assemblies 4 corresponds one-to-one with multiple unwinding units 2. For example, the cutter assembly 4 is configured to include at least two sets corresponding to at least two unwinding shafts 21, specifically two sets arranged left and right and facing each other. The corresponding cutter assembly 4 can cut the material strip unwound by the corresponding unwinding unit 2. For example, the two sets of cutter assemblies 4 corresponding to the two material strips of the new and old tapes are arranged facing each other and can extend forward to cut their respective material strips.

[0076] In another preferred embodiment, the tape splicing and breaking system further includes a tape splicing feed roller assembly 5 disposed on the feed side of the instantaneous heat-melting device 6, which can guide the tape precisely into the instantaneous heat-melting device 6 for welding. The tape splicing feed roller assembly 5 and the cutter assembly 4 together constitute the tape splicing and breaking system. Specifically, the tape splicing feed roller assembly 5 is disposed between the discharge side of the cutter assembly 4 and the feed side of the instantaneous heat-melting device 6, enabling it to provide stable and precise feeding guidance for the tape.

[0077] Please refer to Figure 6As shown, the tape feeding roller assembly 5 includes a first pressing roller 51 and a second pressing roller 52 arranged opposite each other on the left and right sides, and the first pressing roller 51 and the second pressing roller 52 can move closer to each other or move further away from each other. During unwinding and tape feeding, the first pressing roller 51 and the second pressing roller 52 can cooperate to avoid, press, and clamp the tape during tape feeding, and have three operating positions: zero position Q0, tape feeding position Q1, and working position Q2. For example, corresponding to the first pressing roller 51 and the second pressing roller 52 of the two unwinding units 2 on the left and right, the first pressing roller 51 has three operating positions: zero position Q0', tape feeding position Q1', and working position Q2', and the second pressing roller 52 also has three operating positions: zero position Q0'', tape feeding position Q1'', and working position Q2'', ensuring tape feeding stability and smooth unwinding operation.

[0078] Specifically, the first pressing roller 51 is connected to the first pressing roller drive 53 and can be driven by the first pressing roller drive 53 to move back and forth to approach or move away from the second pressing roller 52. The second pressing roller 52 is connected to the second pressing roller drive 54 and can be driven by the second pressing roller drive 54 to move back and forth to approach or move away from the first pressing roller 51. This enables the first pressing roller 51 and the second pressing roller 52 to perform bidirectional alternating synchronous actions, further improving the stability of the tape splicing and the smoothness of the unwinding operation.

[0079] The feeding roller assembly 5 has three operating positions: zero position Q0, feeding position Q1, and working position Q2. The cutter 41 of the cutter assembly 4 has two positions: zero position P0 and working position P1. For example, corresponding to the two cutter assemblies 4 of the left and right unwinding units 2, the cutter 41 of the left cutter assembly 4 has two positions: zero position P0' and working position P1', and the cutter 41 of the right cutter assembly 4 has two positions: zero position P0'' and working position P1''. Please refer to [link / reference]. Figure 7 As shown, when the first pressing roller 51 corresponding to roll A is in the zero position and the second pressing roller 52 corresponding to roll B is in the working position, the first pressing roller 51 corresponding to roll A avoids the working range of roll B, and the second pressing roller 52 corresponding to roll B makes the tension distribution of roll B more uniform during operation, and vice versa; when the first pressing roller 51 corresponding to roll A is in the tape-connecting position and the second pressing roller 52 corresponding to roll B is in the working position, the tape head A0 of roll A and the tape tail B1 of roll B can be pressed together and conveyed to the work station for switching. The system then cuts off the tail B1 of the B roll with the corresponding cutter 41, and unwinds the working strip A2 of the A roll. Conversely, the B roll head and A roll tail are pressed together and conveyed to the workstation switching system. Then, the A roll cutter 41 cuts off the tail A1 of the A roll, and unwinds the working strip B2 of the B roll. It has the functions of pressing and conveying the head, distributing tension evenly, and avoiding positions. It can meet the preparation before welding the head of the new roll and the tail of the old roll, and can also improve the conveying stability of the strip during operation.

[0080] Example 2

[0081] The lithium battery current collector unwinding and splicing device in this embodiment is similar to that in Embodiment 1. For further details, please refer to [link to previous document]. Figure 1 As shown, in the lithium battery current collector unwinding and splicing equipment of this embodiment, the station switching system also includes a cooling air knife device 7 installed on the discharge side of the instantaneous hot melt device 6.

[0082] Specifically, the cooling air knife device 7 includes a first air knife 71 and a second air knife 72 arranged opposite to each other on the left and right sides. The first air knife 71 and the second air knife 72 can blow air towards the material strip from the left and right sides of the unwound material strip.

[0083] When the material strip is spliced, after the instantaneous heat-melting device 6 completes the heat-melting splicing, the material strip moves to the corresponding station of the cooling air knife device 7. The first air knife 71 and the second air knife 72 blow air onto the heat-melted material strip to cool it down. This promptly improves the strength of the spliced ​​material strip, effectively preventing the stretching deformation of the spliced ​​material strip in the molten state, ensuring the strength and stability of the splice, and preventing the high temperature from interfering with the current collector in subsequent conveying.

[0084] In addition, the discharge side of the cooling air knife device 7 is also equipped with a guide roller 11 to guide the air-cooled material strip through the roller.

[0085] Example 3

[0086] The lithium battery current collector unwinding and splicing device in this embodiment is similar to that in Embodiment 1 or Embodiment 2. For further details, please refer to [link to previous document]. Figure 1 As shown, in the lithium battery current collector unwinding and splicing equipment of this embodiment, the instantaneous heat-melting device 6 is slidably mounted on the base 8, and the base 8 has a station switching track. The instantaneous heat-melting device 6 and the cooling air knife device 7 can together form an integrated station switching system, which can slide along the station switching track. In the specific embodiment shown, the base 8 and the station switching track on it have a length extending left and right. The instantaneous heat-melting device 6 can move left and right along the station switching track to switch to correspond to the two unwinding units 2 arranged on the left and right respectively.

[0087] For details, please refer to Figure 1 and Figure 8 As shown, the instantaneous heat-melting device 6 is mounted on the workstation switching bracket 10, and the workstation switching bracket 10 is slidably mounted on the workstation switching track via the slider 9. Furthermore, a positioning drive component may be provided, which may be, but is not limited to, a cylinder or a servo motor screw assembly, allowing the workstation switching bracket 10 to slide and move on the workstation switching track driven by the positioning drive component.

[0088] When switching to a different unwinding unit 2 to unwind new tape, please refer to [link / reference]. Figure 9 As shown, the instantaneous heat-melting device 6 can be switched to the side station corresponding to the corresponding unwinding unit 2 under the drive of the positioning drive component, so that the unwinding strip can be unwound stably and smoothly.

[0089] Furthermore, the feed roller assembly 5 is mounted on the station switching bracket 10 and can move synchronously with the instantaneous heat-melting device 6 to switch stations, ensuring that the feed of the material strip is aligned after the instantaneous heat-melting device 6 switches stations, thus ensuring the stability of the feed and the smoothness of the unwinding.

[0090] In addition, when a cooling air knife device 7 is provided on the discharge side of the instantaneous hot melt device 6, the cooling air knife device 7 can be installed on the station switching bracket 10 and move synchronously with the instantaneous hot melt device 6 to ensure the air cooling effect of the cooling air knife device 7 after the strip is connected and the air cooling cooling effect of the strip.

[0091] The workstation switching system consists of an instantaneous heat-melting device 6, a cooling air knife device 7, a guide roller 11, and a base. Please refer to [link / reference needed]. Figure 9 As shown, the device has two action positions W1 and W2 corresponding to the left and right unwinding units 2. The instantaneous heat-melting device 6 can adaptively match the heating power according to the size of the current collector, material characteristics and production line speed, so as to realize the function of instantaneous heat-melting of the current collector during the conveying process without stopping the machine. The same material heat-melting method does not have any other additional adhesive materials, resulting in high connection strength. The cooling air knife device 7 applies forced air cooling to the current collector after heat-melting, further improving the connection strength, while avoiding interference of the current collector in subsequent conveying due to high temperature. Position W1 can meet the needs of new roll splicing of material A and normal production work, and position W2 can also meet the needs of new roll splicing of material A and normal production work.

[0092] Example 4

[0093] The lithium battery current collector unwinding and splicing device in this embodiment is similar to any one of Embodiments 1 to 3. For further details, please refer to [link to relevant documentation]. Figure 1 As shown, in the lithium battery current collector unwinding and splicing equipment of this embodiment, the tension matching system includes a tension roller assembly 12 disposed on the discharge side of the instantaneous heat-melting device 6, which can adjust the tension of the unwound strip to avoid strip breakage or strip wrinkling.

[0094] Specifically, the tension roller assembly 12 includes a tension roller 121 and a tension roller drive 122 that drives the tension roller 121 to extend and retract. The tension roller drive 122 can be, but is not limited to, a cylinder or a motor. During strip unwinding, the strip passes over the tension roller 121. Driven by the tension roller drive 122, the tension roller 121 floats back and forth, causing the tension of the unwound strip to be adjusted or loosened.

[0095] In a further preferred embodiment, a guide roller 11 is provided between the discharge side of the instantaneous heat-melting device 6 and the feed side of the tension roller assembly 12. Specifically, multiple guide rollers 11 can be provided to accurately guide the material strip discharged from the instantaneous heat-melting device 6 to the tension roller assembly 12.

[0096] In addition, when a cooling air knife device 7 is provided on the discharge side of the instantaneous hot melt device 6, the guide roller 11 can be specifically set between the discharge side of the cooling air knife device 7 and the feed side of the tension roller assembly 12, so as to guide the air-cooled material strip to the tension roller assembly 12.

[0097] The tension roller assembly 12 and the guide roller 11 constitute an integrated tension matching system. Please refer to [link / reference needed]. Figure 10 As shown, the tension roller 121 has two operating positions: working position N1 and belt receiving position N2. When the belt receiving feed roller assembly 5 extends from the belt receiving position to the working position, and the position switching system changes the position accordingly, the tension roller 121 retracts to the working position, releasing the tension of the belt when it enters the working state and maintaining a stable tension adjustment capability in the working state. When the tension roller 121 extends to the belt receiving position, it provides sufficient tension adjustment space when the belt enters the working state.

[0098] Example 5

[0099] The lithium battery current collector unwinding and splicing method of the present invention uses the lithium battery current collector unwinding and splicing equipment of any one of Examples 1 to 4 to perform the unwinding and splicing of the current collector 13. Please refer to [link to relevant documentation]. Figure 11 As shown, it includes the following steps:

[0100] S1. The two unwinding units 2 arranged on the left and right sides of the positioning mounting plate 1 unwind the A roll and B roll of the current collector 13 in sequence. First, the left unwinding unit 2 unwinds the A roll, and the B roll wound on the right unwinding unit 2 waits to be unwound.

[0101] When the A-material roll is about to finish unwinding, please refer to Figure 12 As shown, the three-axis traction correction system 3 on the left is in the zero position waiting for a new roll of material A. The unwinding unit 2 on the right unwinds the roll of material B and suspends the strip head. The three-axis traction correction system 3 corresponding to the unwinding unit 2 on the right guides the strip of material B to the top of the feed roller assembly 5.

[0102] At this time, the first pressing roller 51 is in the working position to make the tension distribution more uniform when the old A material roll is working. The second pressing roller 52 is in the zero position to avoid the working range of the A material roll. The station switching bracket 10 is in the position corresponding to the B material roll to prepare for the connection between the old A material roll and the B material roll head. The cutter 41 corresponding to the A material roll is in the zero position to wait for the tape cutting operation. The cutter 41 corresponding to the B material roll is in the zero position to avoid the working range of the A material roll. The tension roller assembly 12 system is in the working position to release the tension of the A material roll when it enters the working state and maintain the stable tension adjustment capability of the A material roll in the working state.

[0103] S2. During the tape splicing process, the three-axis traction correction system 3 corresponding to roll A remains unchanged, while the three-axis traction correction system 3 corresponding to roll B performs online correction and alignment of the new roll B's tape head to align it with the old roll A's tape head. Combined with the unwinding unit's rotational traction, the new roll B's tape head and the old roll A's tape head are brought to the adsorption waiting position. The first pressing roller 51 remains unchanged, while the second pressing roller 52 extends to the tape splicing position to press the new roll B's tape head and the old roll A's tape head together and transport them to the station switching system. The tape of roll B matches the tape of roll A's tape with its linear speed. The tape of roll B and the tape of roll A are guided together by the tape splicing feed roller assembly 5 into the instantaneous heat-melting device 6 station. The station switching system provides instantaneous heat-melting and cooling for the old roll A's tape head and the tape of roll B's tape head, thus fusing the tape of roll B's tape with the tape of roll A's tape head.

[0104] The cutter 41 corresponding to material A roll extends to the working position to cut off the old roll tail of material A roll. The cutter 41 corresponding to material B roll remains unchanged. The tension roller assembly 12 extends to the tape receiving position to provide sufficient tension adjustment space when roll B enters the working state.

[0105] S3. Cut off the tail of material from roll A and switch to unwinding roll B. Please refer to [link / reference]. Figure 13 As shown, the strip of material B can be conveyed sequentially through roller 11 and tension roller assembly 12 to the next station. At this time, a new strip of material A can be loaded at the unwinding unit 2 on the left.

[0106] A new roll of material A awaits while the old roll of material B is in operation. The three-axis traction and correction system 3 corresponding to roll A is in the adsorption traction position, capturing and adsorbing the new roll head that has fallen from the unwound roll of material A using an electrostatic suction head. The three-axis traction and correction system 3 corresponding to roll B returns to the zero position to enter the next roll change cycle. The first pressing roller 51 returns to the zero position to avoid the working range of roll B. The second pressing roller 52 extends to the working position to make the tension distribution of roll B more uniform during operation. The station switching system changes to the position corresponding to roll A to prepare for the connection between the old roll of material B and the head of roll A. The cutter 41 corresponding to roll A returns to the zero position to avoid the working range of roll B and enters the next roll breaking cycle. The cutter 41 corresponding to roll B remains unchanged. The tension roller assembly 12 returns to the working position to release the tension of roll B entering the working state and maintain a stable tension adjustment capability during the working state of roll B.

[0107] S4. When the B roll on the right is about to finish unwinding, the unwinding unit 2 on the left completes the loading of the new A roll. Please refer to [link / reference]. Figure 14 As shown, the unwinding unit 2 on the left unwinds the new A material roll and suspends the strip head. The three-axis traction correction system 3, corresponding to the unwinding unit 2 on the left, guides the strip of the new A material roll to the top of the feed roller assembly 5.

[0108] S5. When splicing the new A roll with the old B roll, the three-axis traction correction system 3 corresponding to the A roll performs online correction and alignment of the new A roll head to align it with the old B roll. Combined with the left unwinding unit 2, it rotates and pulls the new A roll head to the adsorption waiting position. The three-axis traction correction system 3 corresponding to the B roll remains unchanged. The first pressing roller 51 extends to the splicing position and presses the new A roll head at the adsorption waiting position with the old B roll in operation, and together they are transported to the station switching system. The material of the new A roll and the material of the B roll match the linear speed. The material of the B roll and the material of the new A roll are guided together by the splicing feed roller assembly 5 into the instant heat-melting device 6 station. The second pressing roller 52 remains unchanged. The station switching system provides instant heat-melting and cooling for the old B roll and the new A roll head, and fuses the material of the B roll with the material of the new A roll.

[0109] The cutter 41 corresponding to roll A remains unchanged, while the cutter 41 corresponding to roll B extends to the working position to cut off the tail of the old roll B. The tension roller assembly 12 system extends to the tape receiving position to provide sufficient tension adjustment space when roll A enters the working state.

[0110] S6. Cut off the tail of the B-material roll and switch to unwinding the new A-material roll. Please refer to [link / reference]. Figure 15 As shown, the new A-type material roll can be conveyed sequentially through roller 11 and tension roller assembly 12 to the next station. At this time, a new B-type material roll can be loaded at the unwinding unit 2 on the right.

[0111] While the old A roll is working and the new B roll is waiting, the three-axis traction correction system 3 corresponding to the A roll retracts to the zero position to enter the next roll change cycle. The three-axis traction correction system 3 corresponding to the B roll extends to the adsorption traction position to capture and adsorb the new roll head that falls from the B roll using an electrostatic suction head. The first pressing roller 51 extends to the working position to make the tension distribution of the A roll more uniform during operation. The second pressing roller 52 retracts to the zero position to avoid the working range of the A roll. The station switching system changes to the position corresponding to the B roll to prepare for the connection between the old A roll and the B roll head. The cutter 41 corresponding to the A roll remains unchanged. The cutter 41 corresponding to the B roll retracts to the zero position to avoid the working range of the B roll and enters the next roll breaking cycle. The tension roller assembly 12 retracts to the working position to release the tension of the A roll when it enters the working state and maintains the stable tension adjustment capability of the A roll during the working state.

[0112] S7. Repeating steps S1-S6 above will enable uninterrupted and continuous unwinding of the current collector 13 roll, ensuring production efficiency. Furthermore, the use of an instantaneous heat-melting device 6 for welding ensures the strength and stability of the welded strip, thereby guaranteeing the production quality of the lithium battery electrode sheets.

[0113] In the preferred embodiment, please refer to Figures 12 to 15 As shown, in the lithium battery current collector unwinding and splicing equipment, a cooling air knife device 7 can be set on the discharge side of the instantaneous hot melt device 6. After the splicing is completed, the combined strip can be cooled by air blowing from both sides of the strip by the cooling air knife device 7. After being cooled by air, the strip passes through the roller 11 and tension roller assembly 12 in sequence for unwinding and feeding, which ensures the strength and stability of the strip after splicing in a timely manner, avoids the current collector 13 from breaking and stretching deformation, and further ensures the production quality of lithium battery electrode sheets.

[0114] The above embodiments are merely preferred embodiments of the present invention, and are only used to further describe the technical solutions of the present invention in detail. However, the above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. The scope of protection and implementation of the present invention are not limited thereto. Any changes, combinations, deletions, substitutions or modifications made without departing from the spirit and principle of the present invention will be included within the scope of protection of the present invention.

Claims

1. A method for unwinding and splicing current collectors in a lithium battery, characterized in that, Includes the following steps: S1. At least two unwinding units shall unwind roll A and roll B in sequence. S2, Work on old rolls of material A, new rolls of material B awaiting completion. The three-axis traction and correction system corresponding to roll A is in the zero position, waiting for the new roll A. The three-axis traction and correction system corresponding to roll B is in the adsorption traction position, capturing and adsorbing the new roll head that falls from the unwinding unit of roll B through the electrostatic suction head. The pressing roller corresponding to roll A is in the working position to ensure uniform tension distribution when roll A is working. The pressing roller corresponding to roll B is in the zero position to avoid the working range of roll A. The station switching system is in the position corresponding to roll B to prepare for the connection between the old roll A and the head of roll B. The cutter corresponding to roll A is in the zero position, waiting for the tape cutting operation. The cutter corresponding to roll B is in the zero position to avoid the working range of roll A. The tension matching system is in the working position to release the tension of roll A when it enters the working state and maintain the stable tension adjustment capability of roll A in the working state. S3. Connect the old roll of material A to the new roll of material B. The three-axis traction and correction system for roll A remains unchanged. The three-axis traction and correction system for roll B performs online correction and alignment on the new roll head of roll B to align it with the old roll of roll A. Combined with the rotation of the corresponding unwinding unit, it is pulled to the adsorption waiting position. The pressing roller for roll A remains unchanged. The pressing roller for roll B extends to the tape receiving position to press the new roll head of roll B at the adsorption waiting position with the old roll of roll A in operation and transport them together to the station switching system. The station switching system provides instantaneous heat melting for the old roll of roll A and the roll head of roll B. The cutter for roll A extends to the working position to cut off the tail of the old roll of roll A. The cutter for roll B remains unchanged. The tension matching system extends to the tape receiving position to provide sufficient tension adjustment space when the new roll of roll B enters the working state. S4. New rolls of material A are awaiting processing; old rolls of material B are being worked on. The three-axis traction and correction system corresponding to roll A is in the adsorption traction position, capturing and adsorbing the new roll head that falls from the unwinding unit of roll A through the electrostatic suction head. The three-axis traction and correction system corresponding to roll B returns to the zero position to enter the next roll change cycle. The pressing roller corresponding to roll A returns to the zero position to avoid the working range of roll B. The pressing roller corresponding to roll B extends to the working position to ensure uniform tension distribution when roll B is working. The station switching system changes to the position corresponding to roll A to prepare for the connection between the old roll B and the roll head of roll A. The cutter corresponding to roll A returns to the zero position to avoid the working range of roll B and enters the next roll breaking cycle. The cutter corresponding to roll B remains unchanged. The tension matching system returns to the working position to release the tension of roll B when it enters the working state and maintains the stable tension adjustment capability of roll B in the working state. S5. Connect the new roll of material A to the old roll of material B. The three-axis traction correction system corresponding to roll A performs online correction and alignment of the new roll head of roll A to align it with the old roll of roll B, and combines it with the unwinding unit to rotate and pull it to the adsorption waiting position. The three-axis traction correction system corresponding to roll B remains unchanged. The pressing roller corresponding to roll A extends to the tape receiving position to press the new roll head of roll A in the adsorption waiting position with the old roll of roll B in operation and transport them together to the station switching system. The pressing roller corresponding to roll B remains unchanged. The station switching system provides instantaneous heat melting for the old roll of roll B and the roll head of roll A. The cutter corresponding to roll A remains unchanged. The cutter corresponding to roll B extends to the working position to cut off the tail of the old roll of roll B. The tension matching system extends to the tape receiving position to provide sufficient tension adjustment space when the new roll of roll A enters the working state. S6. Work on old rolls of material A, while new rolls of material B await. The three-axis traction and correction system corresponding to roll A returns to the zero position to enter the next roll change cycle. The three-axis traction and correction system corresponding to roll B extends to the adsorption and traction position to capture and adsorb the new roll head that falls from the unwinding unit of roll B through the electrostatic suction head. The pressing roller corresponding to roll A extends to the working position to make the tension distribution of roll A more uniform during operation. The pressing roller corresponding to roll B returns to the zero position to avoid the working range of roll A. The station switching system changes to the position corresponding to roll B to prepare for the connection between the old roll A and the roll head of roll B. The cutter corresponding to roll A remains unchanged. The cutter corresponding to roll B returns to the zero position to avoid the working range of roll B and enters the next roll break cycle. The tension matching system returns to the working position to release the tension of roll A when it enters the working state and maintains the stable tension adjustment capability of roll A during the working state. S7, reciprocating cycle S3-S6, to achieve automatic unwinding and tape splicing.

2. The lithium battery current collector unwinding and splicing method according to claim 1, characterized in that, After the combined strips in S3 and S5 have been welded, they are cooled by air cooling.

3. A lithium battery current collector unwinding and splicing device for implementing the lithium battery current collector unwinding and splicing method of claim 1 or 2, characterized in that, include: At least two unwinding units, each unwinding unit having an independent unwinding shaft; A tape splicing and breaking system is disposed on the discharge side of the unwinding unit along the forward direction of the unwinding tape; the tape splicing and breaking system includes a cutter assembly and a tape splicing feed roller assembly; A station switching system is located on the discharge side of the tape splicing and breaking system along the forward direction of the unwinding tape; the station switching system includes an instantaneous heat-melting device that can be moved and switched to correspond to at least two unwinding units respectively. At least two sets of three-axis traction correction systems, corresponding to at least two of the unwinding shafts, are arranged between the unwinding discharge side of the unwinding unit and the feeding side of the station switching system along the forward direction of the unwinding strip; the three-axis traction correction system includes a traction head and a traction drive assembly, the traction drive assembly being connected to the traction head and driving the traction head to move. A tension matching system is installed on the discharge side of the station switching system; And the control logic system, which uses program control for automatic unwinding and tape splicing.

4. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The unwinding shaft is mounted on the positioning mounting plate and is driven by a positioning drive component to extend and retract relative to the positioning mounting plate.

5. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The traction head includes an electrostatic suction head.

6. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The traction drive assembly includes an X-axis drive component, a Y-axis drive component, and a Z-axis drive component; The traction head is connected to the output end of the Y-axis drive component and is driven by the Y-axis drive component to move telescopically in the Y-axis direction; the Y-axis drive component is slidably mounted on the X-axis track and is driven by the X-axis drive component to slide in the X-axis direction; the X-axis drive component is slidably mounted on the Z-axis track and is driven by the Z-axis drive component to slide in the Z-axis direction.

7. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The number of the cutting assemblies corresponds to the number of unwinding shafts; each cutting assembly includes a cutting blade and a cutting blade drive unit that is connected to the cutting blade to drive the cutting blade to move and cut.

8. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The feed roller assembly includes a first pressing roller and a second pressing roller arranged opposite to each other, and the first pressing roller and the second pressing roller can move closer to each other or move further away from each other.

9. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The discharge side of the instantaneous hot melt device is equipped with a cooling air knife device, which includes a first air knife and a second air knife arranged opposite to each other.

10. The lithium battery current collector unwinding and splicing device according to claim 3, characterized in that, The discharge side of the instantaneous heat-melting device is provided with a tension roller assembly, which includes a tension roller and a tension roller drive component for driving the tension roller to extend and retract.

11. The lithium battery current collector unwinding and splicing device according to claim 10, characterized in that, An overpass roller is provided between the discharge side of the instantaneous hot melt device and the feed side of the tension roller assembly.

12. The lithium battery current collector unwinding and splicing device according to any one of claims 3-11, characterized in that, The instantaneous heat-melting device is slidably mounted on the workstation switching track and can slide and move on the workstation switching track.

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