A system and method for preparing a spaced copper-lithium composite tape

Abstract

The application discloses a kind of preparation system and method of interval copper lithium composite tape, belong to battery technical field, it includes installation backboard;Unwinding unit is installed on installation backboard, for unwinding film-coated lithium tape, copper foil and protective film;Cutting unit is installed on installation backboard, for film-coated lithium tape in movement is carried out fixed-length cutting;Compression roller unit is installed in the middle of installation backplate, for the lithium tape after cutting is rolled with copper foil and is rolled to compound;Winding unit is installed on installation backboard, for winding film and finished product composite tape.The application cutting unit can be accurate cutting to lithium tape with fixed length, positioning, ensure that lithium tape is arranged on copper foil according to preset interval.At the same time, negative pressure mechanism can suck away cutting waste, avoid residual influence subsequent compound, both ensure product consistency, greatly reduce the waste of lithium material.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, and more specifically, relates to a system and method for preparing spaced copper-lithium composite strips. Background Technology

[0002] Lithium metal theoretically possesses the highest energy density (3860 mAh / g) and the lowest electrode potential (-3.04 VYs standard hydrogen electrode), making it a highly promising anode material for next-generation high-energy batteries or solid-state batteries. When lithium metal is used as an anode material in solid-state batteries, it is typically prepared into 5-50 μm thick lithium metal strips, which are then composited with copper. Lithium metal participates in the electrochemical reaction as the anode material, while copper acts similarly to the current collector in liquid lithium-ion batteries, facilitating electron transport.

[0003] With the development of lithium battery technology, large-capacity batteries are gradually becoming a trend. The current common process for fabricating large-size lithium composite electrodes involves leaving blank copper foil along the width of the copper-lithium composite strip, cutting it into sheets, and then soldering the tabs onto the reserved blank copper foil. Using this method to manufacture large batteries places high demands on the width of the lithium strip; depending on the battery size, the width needs to be 300mm or more.

[0004] Currently, manufacturing wide-width lithium strips is very difficult. One solution is to completely overlap the lithium strip and copper foil in the width direction when laminating them onto the copper foil, leaving a certain gap in the length direction to create a spaced-out lithium-copper composite strip. During subsequent sheet fabrication, the strip is laterally cut at the gap, and the tabs are attached to the gap in the length direction. This allows for the fabrication of large-size negative electrode sheets that meet the requirements of large batteries.

[0005] Patent CN216928627U discloses a method for preparing intermittent lithium-ion strips. The method involves intermittently coating a release agent onto copper foil, then rolling the lithium-ion strip and copper foil together. Due to the release agent, the lithium-ion strip cannot transfer to the copper foil where the release agent is present, while it will transfer to the copper foil where there is no release agent, thus forming an intermittent lithium-copper composite strip. One problem with this method is that the lithium at the edges of the intermittent locations is separated by tearing. The reliability of this tearing separation is low, and the edges cannot be made neat and uniform, and may even develop into large-area defects, which will greatly affect the subsequent manufacturing of the battery cell electrodes.

[0006] Patent CN116811406A discloses a structure and method for fabricating an intermittent lithium-copper composite strip. This patent uses a laser cutting device to cut only the lithium strip and not the support film strip, forming an intermittent composite lithium strip, thus achieving intermittent bonding of the lithium strip to copper foil along its length. However, laser cutting causes hot-melt edges and oxidation of the lithium metal, and also forms a high-resistivity lithium oxide layer, affecting battery performance and safety. Summary of the Invention

[0007] To solve the above problems, the present invention adopts the following technical solution: A system for preparing spaced copper-lithium composite strips, comprising: Install back panel; An unwinding unit is mounted on the mounting back plate for unwinding coated lithium tape, copper foil, and protective film. A cutting unit, mounted on the mounting back plate, is used to cut the moving coated lithium strip to a fixed length; A pressure roller unit is installed in the middle of the mounting back plate and is used to roll-press the cut lithium strip with copper foil. A winding unit is mounted on the mounting back plate and is used to wind up the coated and finished composite tape.

[0008] Furthermore, the unwinding unit includes: A first unwinding device and a second unwinding device for unwinding coated lithium strip, a third unwinding device for unwinding copper foil, and a fourth unwinding device for unwinding protective film. The first unwinding device, the second unwinding device, and the third unwinding device are all installed on the upper part of the mounting back plate; the fourth unwinding device is installed on the lower part of the mounting back plate.

[0009] Furthermore, the pressure roller unit includes a first pressure roller device and a second pressure roller device, which are horizontally distributed and move towards each other to roll-press the strip.

[0010] Furthermore, the cutting unit includes a first cutting device and a second cutting device arranged symmetrically. The first cutting device and the second cutting device have the same structure. The first cutting device is located between the first unwinding device and the first pressure roller device, and the second cutting device is located between the second unwinding device and the second pressure roller device.

[0011] Furthermore, the first cutting device includes: A slide rail, which is mounted on the mounting back plate; The lower pressure plate is U-shaped and has pulleys that are slidably mounted on the slide rail. The lower pressure plate also has a placement surface for receiving the strip. Mounting stand, which is connected to one side of the lower pressure plate; The upper pressure plate is in the shape of an inverted U. The upper pressure plate is installed on the mounting base and can be moved up and down. It is positioned directly above the lower pressure plate. An operating space is formed between the upper pressure plate and the placement surface. A drive mechanism, mounted on the mounting base, is used to drive the upper pressure plate to move up and down; A cutter, which is movable up and down and positioned at the lower end of the upper pressure plate, is used to cut the strip on the placement surface; A negative pressure mechanism, located within the operating space, is used to absorb the cut lithium strips.

[0012] Furthermore, the upper pressure plate includes an upper pressure plate body and an upper pressure plate extension that can be telescopically extended within the upper pressure plate body; The lower pressure plate includes a lower pressure plate body and a lower pressure plate extension that can be telescopically extended within the lower pressure plate body; The placement surface includes a placement surface body and a placement surface extension that can be extended and retracted within the placement surface body; The upper pressure plate body and the upper pressure plate extension, the lower pressure plate body and the lower pressure plate extension, and the placement surface body and the placement surface extension are all connected by telescopic rods to achieve translational movement.

[0013] Furthermore, a first correction device, a first tension control device, and a first smoothing device are sequentially arranged between the first unwinding device and the first cutting device along the moving direction of the strip; a second correction device, a second tension control device, and a second smoothing device are sequentially arranged between the second unwinding device and the second cutting device along the moving direction of the strip; a third smoothing device is arranged between the third unwinding device and the pressure roller unit; a first meter counter and a first laser positioning device are arranged between the first shearing device and the first pressure roller unit; and a second meter counter and a second laser positioning device are arranged between the second shearing device and the second pressure roller unit, for precisely controlling the cutting length and cutting position of the lithium strip.

[0014] Furthermore, the winding unit includes: A first winding device and a second winding device for winding up the coating peeled off from the lithium strip; and a third winding device for winding up the finished copper-lithium composite strip and protective film. The first winding device and the second winding device are both installed in the lower middle part of the mounting back plate, and the third winding device is installed in the lower part of the mounting back plate.

[0015] Furthermore, a tension sensing device and a guide rail are sequentially arranged between the pressure roller unit and the third winding device along the strip movement direction. The tension sensing device is located on the lower side of the pressure roller unit and is used to realize the winding tension control of the copper-lithium composite strip. A third meter counter is provided on one side of the tension sensing device to realize precise control of the winding quantity.

[0016] A method for preparing a spaced copper-lithium composite strip, using the preparation system for a spaced copper-lithium composite strip described in any one of the above-mentioned methods, includes the following steps: S1. Prepare two rolls of coated lithium tape, one roll of copper foil, and one roll of protective film; S2. Place a roll of coated lithium tape on the first unwinding device, and pass through the guide roller, the first correction device, the first tension control device, the first smoothing device in sequence, enter the first cutting device, then enter between the first pressure roller and the second pressure roller, and finally be coated and wound up on the first winding device, and the lithium tape is wound up on the third winding device. S3. Place another roll of coated lithium tape on the second unwinding device, and pass it sequentially through the guide roller, the second correction device, the second tension control device, and the second smoothing device. Then, it enters the second cutting device, then between the first pressure roller and the second pressure roller, and finally, the coated tape is wound up on the second winding device, and the lithium tape is wound up on the third winding device. S4. Place the copper foil on the third unwinding device, pass through the third smoothing device, enter between the first pressure roller and the second pressure roller, roll-form it, pass through the third tension control device, and then wind it up in the third winding device. S5. Place the protective film on the fourth unwinding device and wind it on the third winding device to coat and wind up the copper-lithium composite tape. S6. Start the cutting device. After the lithium strip reaches the predetermined position by the meter counter and laser positioning device, start the cylinder. The upper and lower pressure plates fix the lithium strip on the placement surface. Then start the cutter to cut the lithium strip. Finally, the negative pressure device sucks away the cut lithium strip. S7. Start the entire device to continuously produce spaced copper-lithium composite strips; S8. If producing single-sided spaced copper-lithium composite strip, simply discard the first unwinding device or the second unwinding device.

[0017] The beneficial effects of this invention are: This invention utilizes the coordinated control of a laser positioning device and a meter counter to enable the cutting unit to precisely cut lithium strips to a fixed length and position, ensuring that the lithium strips are arranged on the copper foil at preset intervals. Simultaneously, a negative pressure mechanism removes cutting waste, preventing residue from affecting subsequent lamination. This ensures product consistency and significantly reduces lithium material waste.

[0018] The cutting device of the present invention has retractable extension parts (connected by telescopic rods) on the upper pressure plate, lower pressure plate and anti-slip surface, which can flexibly adjust the pressing area according to the width of the lithium strip, avoid damaging the edge, and ensure that it is firmly fixed during cutting and the cutting action is clean and neat. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the preparation system for a spaced copper-lithium composite strip according to the present invention; Figure 2 This is a schematic diagram of the cutting device structure of the preparation system of the spaced copper-lithium composite strip of the present invention. Figure 3 This is a partial schematic diagram of the cutting device of the preparation system for a spaced copper-lithium composite strip according to the present invention.

[0020] In the diagram: 1. First unwinding device; 2. First correction device; 3. First tension control device; 4. First smoothing device; 5. First cutting device; 6. Third unwinding device; 7. Rewinding device; 8. Second unwinding device; 9. Second correction device; 10. Second tension control device; 11. Second smoothing device; 12. Second cutting device; 13. First pressure roller device; 14. Second pressure roller device; 15. Pressure roller motor; 16. First meter counter. 17. Second meter counter; 18. Second winding device; 19. First winding device; 20. Tension sensing device; 21. Third meter counter; 22. Guide roller; 24. Fourth unwinding device; 25. Third winding device; 26. Mounting back plate; 27. Slide rail; 28. Lower pressure plate; 29. ​​Upper pressure plate; 30. Placement surface; 31. Cutter; 32. Negative pressure device; 33. Strip material; 34. Cylinder; 35. Mounting stand; 36. Pulley. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device 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 limiting this invention.

[0024] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0025] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0026] Example 1

[0027] refer to Figures 1 to 3 A system for preparing spaced copper-lithium composite strips, comprising: Install back panel 26; An unwinding unit is mounted on the mounting back plate 26 and is used to unwind coated lithium strip, copper foil and protective film. A cutting unit is mounted on the mounting back plate 26 and is used to cut the coated lithium strip to a fixed length while it is moving. The pressure roller unit is installed in the middle of the mounting back plate 26 and is used to roll-press the cut lithium strip with copper foil. The winding unit is mounted on the mounting back plate 26 and is used to wind up the laminated and finished composite tape.

[0028] In this embodiment, the unwinding unit includes: A first unwinding device 1 and a second unwinding device 8 for unwinding coated lithium strip, a third unwinding device 6 for unwinding copper foil, and a fourth unwinding device 24 for unwinding protective film. The first unwinding device 1, the second unwinding device 8 and the third unwinding device 6 are all installed on the upper part of the mounting back plate 26; the fourth unwinding device 24 is installed on the lower part of the mounting back plate 26.

[0029] In this embodiment, the pressure roller unit includes a first pressure roller device 13 and a second pressure roller device 14. The first pressure roller device 13 and the second pressure roller device 14 are horizontally distributed and move towards each other to roll-press the strip 33.

[0030] In practice, the pressure roller device is driven by the pressure roller motor 15.

[0031] In this embodiment, the cutting unit includes a first cutting device 5 and a second cutting device 12 arranged symmetrically. The first cutting device 5 and the second cutting device 12 have the same structure. The first cutting device 5 is located between the first unwinding device 1 and the first pressure roller device 13, and the second cutting device 12 is located between the second unwinding device 8 and the second pressure roller device 14.

[0032] In this embodiment, the first cutting device 5 includes: Slide rail 27 is mounted on mounting back plate 26; The lower pressure plate 28 is U-shaped and is provided with a pulley 36. The pulley 36 is slidably mounted on the slide rail 27. The lower pressure plate 28 is provided with a placement surface 30 for receiving the strip 33. Mounting stand 35, which is connected to one side of the lower pressure plate 28; The upper pressure plate 29 is inverted U-shaped and can be moved up and down on the mounting base 35. It is positioned directly above the lower pressure plate 28, and an operating space is formed between the upper pressure plate 29 and the placement surface 30. The drive mechanism is mounted on the mounting base 35 and is used to drive the upper pressure plate 29 to move up and down. The cutter 31 is movable up and down and is located at the lower end of the upper pressure plate 29 for cutting the strip 33 on the placement surface 30. The negative pressure mechanism is located within the operating space and is used to pick up the cut lithium strips.

[0033] Preferably, the drive mechanism is a cylinder 34.

[0034] In practice, after the system is started, the coated lithium strip moves forward continuously in the first and second cutting devices. The first meter counter and the first laser positioning device detect the moving length and cutting mark position of the lithium strip in real time. Similarly, the second meter counter and the second laser positioning device detect the second lithium strip. When the lithium strip is detected to have reached the preset cutting length, the system issues a cutting signal.

[0035] In practice, the cylinder pushes the upper pressure plate vertically downwards, causing the upper and lower pressure plates to close together and press the lithium strip firmly onto the placement surface, preventing the strip from shifting during cutting. Driven by the cylinder or an independent cutting mechanism, the cutter quickly extends from the lower end of the upper pressure plate and cuts downwards, cutting the lithium strip to a fixed length. Simultaneously, the negative pressure mechanism activates, generating a negative pressure airflow within the operating space. This airflow draws in the cut lithium strip segments and guides them to the waste collection box, preventing them from falling and getting caught in subsequent pressure rollers.

[0036] In this embodiment, the upper pressure plate 29 includes an upper pressure plate 29 body and an upper pressure plate 29 extension that can be telescopically extended within the upper pressure plate 29 body; The lower pressure plate 28 includes a lower pressure plate 28 body and a lower pressure plate 28 extension that can be telescopically extended within the lower pressure plate 28 body; The placement surface 30 includes a placement surface 30 body and a placement surface 30 extension that is retractable within the placement surface 30 body; The upper pressure plate 29 body and its extension, the lower pressure plate 28 body and its extension, and the placement surface 30 body and its extension are all connected by telescopic rods to achieve translational movement.

[0037] In practice, the upper pressure plate, lower pressure plate, and placement surface are all equipped with extension structures, and the length can be adjusted by telescopic rods to accommodate lithium strips of different widths without the need to replace the entire set of components.

[0038] In this embodiment, a first correction device 2, a first tension control device 3, and a first smoothing device 4 are sequentially arranged between the first unwinding device 1 and the first cutting device 5 along the moving direction of the strip 33; a second correction device 9, a second tension control device 10, and a second smoothing device 11 are sequentially arranged between the second unwinding device 8 and the second cutting device 12 along the moving direction of the strip 33; a third smoothing device is arranged between the third unwinding device 6 and the pressure roller unit; a first meter counter 16 and a first laser positioning device are arranged between the first shearing device and the first pressure roller unit 13; and a second meter counter 17 and a second laser positioning device are arranged between the second shearing device and the second pressure roller unit 14, for precisely controlling the cutting length and cutting position of the lithium strip.

[0039] In this embodiment, the winding unit includes: A first winding device 19 and a second winding device 18 for winding up the coating peeled off from the lithium strip; and a third winding device 25 for winding up the finished copper-lithium composite strip and protective film. The first winding device 19 and the second winding device 18 are both installed in the lower middle part of the mounting back plate 26, and the third winding device 25 is installed in the lower part of the mounting back plate 26.

[0040] In practice, all winding devices are equipped with independent servo motors and tension control modules to ensure that the winding speed is synchronized with the main production line speed.

[0041] In this embodiment, a tension sensing device 20 and a guide rail are sequentially arranged between the pressure roller unit and the third winding device 25 along the moving direction of the strip 33. The tension sensing device 20 is located on the lower side of the pressure roller unit and is used to realize the winding tension control of the copper-lithium composite strip. A third meter counter 21 is provided on one side of the tension sensing device 20 to realize the precise control of the winding quantity.

[0042] In practice, the first pressure roller device 13 and the second pressure roller device 14 rotate in opposite directions under the drive of the pressure roller motor 15, and the hydraulic cylinder provides the pressing force. During the rolling process, the upper and lower lithium strip segments are pressed onto both sides or one side of the copper foil at predetermined intervals (depending on the specific configuration) to form a continuous, intermittent copper-lithium composite strip. The rolled composite strip is drawn out from below the pressure roller unit, and the winding tension is detected in real time by a tension sensing device to ensure neat winding. The third meter counter records the winding length simultaneously.

[0043] Example 2 This example provides a method for preparing a spaced copper-lithium composite strip, using the preparation system for a spaced copper-lithium composite strip from Example 1, including the following steps: S1. Prepare two rolls of coated lithium tape, one roll of copper foil, and one roll of protective film; S2. Place a roll of coated lithium tape on the first unwinding device 1, and pass through the guide roller 22, the first correction device 2, the first tension control device 3, the first smoothing device 4 in sequence, enter the first cutting device 5, then enter between the first pressure roller and the second pressure roller, and finally be coated and wound up on the first winding device 19, and the lithium tape is wound up on the third winding device 25. S3. Place another roll of coated lithium tape on the second unwinding device 8, and pass through the guide roller 22, the second correction device 9, the second tension control device 10, the second smoothing device 11 in sequence, enter the second cutting device 12, then enter between the first pressure roller and the second pressure roller, and finally be coated and wound up on the second winding device 18, and the lithium tape is wound up on the third winding device 25. S4. Place the copper foil on the third unwinding device 6, and through the third smoothing device, enter between the first pressure roller and the second pressure roller. After being rolled and formed, it passes through the third tension control device and is wound up in the third winding device 25. S5. Place the protective film on the fourth unwinding device 24 and wind it on the third winding device 25 to coat and wind up the copper-lithium composite tape. S6. Start the cutting device. After the lithium strip reaches the predetermined position by the meter counter and laser positioning device, start the cylinder 34. The upper pressure plate 29 and the lower pressure plate 28 fix the lithium strip on the placement surface 30. Then start the cutter 31 to cut the lithium strip. Then the cut lithium strip is sucked away by the negative pressure device 32. S7. Start the entire device to continuously produce spaced copper-lithium composite strips; S8. If producing single-sided spaced copper-lithium composite strip, simply discard the first unwinding device 1 or the second unwinding device 8.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A system for preparing a spaced copper-lithium composite strip, characterized in that, include: Install back panel; An unwinding unit is mounted on the mounting back plate for unwinding coated lithium tape, copper foil, and protective film. A cutting unit, mounted on the mounting back plate, is used to cut the moving coated lithium strip to a fixed length; A pressure roller unit is installed in the middle of the mounting back plate and is used to roll-press the cut lithium strip with copper foil. A winding unit is mounted on the mounting back plate and is used to wind up the coated and finished composite tape.

2. The preparation system for a spaced copper-lithium composite strip according to claim 1, characterized in that, The unwinding unit includes: A first unwinding device and a second unwinding device for unwinding coated lithium strip, a third unwinding device for unwinding copper foil, and a fourth unwinding device for unwinding protective film. The first unwinding device, the second unwinding device, and the third unwinding device are all installed on the upper part of the mounting back plate; the fourth unwinding device is installed on the lower part of the mounting back plate.

3. The preparation system for a spaced copper-lithium composite strip according to claim 2, characterized in that, The pressure roller unit includes a first pressure roller device and a second pressure roller device. The first pressure roller device and the second pressure roller device are horizontally distributed and move towards each other to roll-press the strip.

4. The preparation system for a spaced copper-lithium composite strip according to claim 3, characterized in that, The cutting unit includes a first cutting device and a second cutting device arranged symmetrically. The first cutting device and the second cutting device have the same structure. The first cutting device is located between the first unwinding device and the first pressure roller device, and the second cutting device is located between the second unwinding device and the second pressure roller device.

5. The preparation system for a spaced copper-lithium composite strip according to claim 4, characterized in that, The first cutting device includes: A slide rail, which is mounted on the mounting back plate; The lower pressure plate is U-shaped and has pulleys that are slidably mounted on the slide rail. The lower pressure plate also has a placement surface for receiving the strip. Mounting stand, which is connected to one side of the lower pressure plate; The upper pressure plate is in the shape of an inverted U. The upper pressure plate is installed on the mounting base and can be moved up and down. It is positioned directly above the lower pressure plate. An operating space is formed between the upper pressure plate and the placement surface. A drive mechanism, mounted on the mounting base, is used to drive the upper pressure plate to move up and down; A cutter, which is movable up and down and positioned at the lower end of the upper pressure plate, is used to cut the strip on the placement surface; A negative pressure mechanism, located within the operating space, is used to absorb the cut lithium strips.

6. The preparation system for a spaced copper-lithium composite strip according to claim 5, characterized in that, The upper pressure plate includes an upper pressure plate body and an upper pressure plate extension that can be telescopically extended within the upper pressure plate body; The lower pressure plate includes a lower pressure plate body and a lower pressure plate extension that can be telescopically extended within the lower pressure plate body; The placement surface includes a placement surface body and a placement surface extension that can be extended and retracted within the placement surface body; The upper pressure plate body and the upper pressure plate extension, the lower pressure plate body and the lower pressure plate extension, and the placement surface body and the placement surface extension are all connected by telescopic rods to achieve translational movement.

7. The preparation system for a spaced copper-lithium composite strip according to claim 5, characterized in that, A first correction device, a first tension control device, and a first smoothing device are sequentially arranged between the first unwinding device and the first cutting device along the moving direction of the strip; a second correction device, a second tension control device, and a second smoothing device are sequentially arranged between the second unwinding device and the second cutting device along the moving direction of the strip; a third smoothing device is arranged between the third unwinding device and the pressure roller unit; a first meter counter and a first laser positioning device are arranged between the first shearing device and the first pressure roller unit; and a second meter counter and a second laser positioning device are arranged between the second shearing device and the second pressure roller unit, for precisely controlling the cutting length and cutting position of the lithium strip.

8. The preparation system for a spaced copper-lithium composite strip according to claim 7, characterized in that, The winding unit includes: A first winding device and a second winding device for winding up the coating peeled off from the lithium strip; and a third winding device for winding up the finished copper-lithium composite strip and protective film. The first winding device and the second winding device are both installed in the lower middle part of the mounting back plate, and the third winding device is installed in the lower part of the mounting back plate.

9. The preparation system for a spaced copper-lithium composite strip according to claim 8, characterized in that, A tension sensing device and a guide rail are sequentially arranged between the pressure roller unit and the third winding device along the strip movement direction. The tension sensing device is located on the lower side of the pressure roller unit and is used to realize the winding tension control of the copper-lithium composite strip. A third meter counter is provided on one side of the tension sensing device to realize the precise control of the winding quantity.

10. A method for preparing a spaced-out copper-lithium composite strip, using the preparation system for a spaced-out copper-lithium composite strip according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Prepare two rolls of coated lithium tape, one roll of copper foil, and one roll of protective film; S2. Place a roll of coated lithium tape on the first unwinding device, and pass through the guide roller, the first correction device, the first tension control device, the first smoothing device in sequence, enter the first cutting device, then enter between the first pressure roller and the second pressure roller, and finally be coated and wound up on the first winding device, and the lithium tape is wound up on the third winding device. S3. Place another roll of coated lithium tape on the second unwinding device, and pass it sequentially through the guide roller, the second correction device, the second tension control device, and the second smoothing device. Then, it enters the second cutting device, then between the first pressure roller and the second pressure roller, and finally, the coated tape is wound up on the second winding device, and the lithium tape is wound up on the third winding device. S4. Place the copper foil on the third unwinding device, pass through the third smoothing device, enter between the first pressure roller and the second pressure roller, roll-form it, pass through the third tension control device, and then wind it up in the third winding device. S5. Place the protective film on the fourth unwinding device and wind it up on the third winding device to coat and wind up the copper-lithium composite tape. S6. Start the cutting device. After the lithium strip reaches the predetermined position by the meter counter and laser positioning device, start the cylinder. The upper and lower pressure plates fix the lithium strip on the placement surface. Then start the cutter to cut the lithium strip. Finally, the negative pressure device sucks away the cut lithium strip. S7. Start the entire device to continuously produce spaced copper-lithium composite strips; S8. If producing single-sided spaced copper-lithium composite strip, simply discard the first unwinding device or the second unwinding device.

Images