A lithium battery pole piece multi-slitting machine and a use method thereof

Abstract

The application discloses a lithium battery pole piece multi-time slitting machine and a use method thereof, and relates to the technical field of lithium battery pole piece slitting machines, which comprises a bottom plate, a rack, a unwinding assembly, a first-time cutter assembly, an upper cutter assembly, a lower cutter assembly, an upper winding assembly and a lower winding assembly. The lithium battery pole piece multi-time slitting machine can cut a material belt into multiple (four or six) material belts with the same or different lengths and wind the material belts, compared with other mechanisms. The design of the lithium battery pole piece multi-time slitting machine reduces the parts of the cutter assembly, widens the application range of the pole piece slitting equipment, reduces the cost of pole piece slitting, improves the precision and efficiency of lithium battery pole piece material belt slitting, and facilitates the monitoring, replacement and threading of the pole piece.

Description

Technical Field

[0001] This invention relates to the technical field of lithium battery production, specifically to a lithium battery electrode multiple slitting machine and its usage method. Background Technology

[0002] With the rapid development of society, people's environmental awareness is also constantly increasing. As a green and environmentally friendly energy source, lithium batteries are widely used in various products such as mobile phones, laptops, digital cameras, electric vehicles, power tools, and new energy vehicles due to their advantages such as high energy, long service life, and light weight.

[0003] As is well known, existing battery production includes the step of slitting lithium battery electrodes into strips. However, existing electrode slitting equipment generally includes a frame and an unwinding assembly, a winding assembly, and a cutting assembly mounted on the frame. The cutting assembly is located between the unwinding and winding assemblies. In actual operation, the unwinding assembly unwinds the electrodes, the winding assembly winds them up, and the cutting assembly winds the slit electrodes back up. Current electrode slitting devices can slit electrodes into two or four strips; those that slit six strips at once are relatively rare in the market. Existing electrode slitting devices that slit one to four strips directly use a single cutting device with three blades. This approach has obvious drawbacks; it doesn't achieve good cutting precision. If this technology were used for a device that slits one to six strips, regardless of whether it's slit into two, four, or six strips, each coating of the original electrode would be split in two, resulting in three coatings side-by-side on the six-strip electrode. The three coatings need to be divided into six coatings. To ensure cutting accuracy, the existing technology for a 1-to-4 electrode slitting device improves by performing a secondary cutting, which provides two opportunities to adjust the electrode position and thus achieve better cutting precision. However, for a 1-to-6 electrode slitting machine, the number of cutters required is larger, and the equipment requires more optimized design.

[0004] Therefore, there is an urgent need for a lithium battery electrode multiple slitting machine to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a lithium battery electrode sheet multiple slitting machine.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: A lithium battery electrode sheet multiple slitting machine includes a frame, on which an unwinding assembly, a first cutting assembly, an upper cutting assembly, a lower cutting assembly, an upper winding assembly, and a lower winding assembly are arranged sequentially along the lithium battery electrode sheet conveying direction. The lithium battery electrode includes two or three coating areas, with blank areas formed on the outer side of adjacent coating areas and the outermost coating area.

[0007] A further improvement is that the lithium battery electrode slitting machine is either a lithium battery electrode slitting machine that cuts the electrode into four layers or a lithium battery electrode slitting machine that cuts the electrode into six layers; the lithium battery electrode corresponding to the lithium battery electrode slitting machine that cuts the electrode into four layers has two coating areas, and the lithium battery electrode corresponding to the lithium battery electrode slitting machine that cuts the electrode into six layers has three coating areas.

[0008] In a further improvement, the unwinding assembly includes an unwinding air shaft, a guide roller, a receiving platform, a guide roller one, a guide roller two, and a pendulum roller assembly arranged sequentially along the lithium battery electrode conveying direction.

[0009] In a further improvement, the first cutting assembly includes a five-roll guide roller, a tension roller, a drive roller, and a first cutting device arranged sequentially along the lithium battery electrode conveying direction. A drive pressure roller is installed in conjunction with the drive roller, and the diameter of the drive roller is larger than the diameter of the drive pressure roller. The first cutting device has adjustable guide rollers installed on both its front and rear sides. When the lithium battery electrode multiple slitting machine is a lithium battery electrode slitting machine that cuts one to four pieces, the first cutting device includes a cutting group. When the lithium battery electrode multiple slitting machine is a lithium battery electrode slitting machine that cuts one to six pieces, the first cutting device includes a cutting group of three cutters arranged side by side.

[0010] In a further improvement, the upper cutting assembly includes a seven-roller, a sixteen-roller, an upper flattening roller, an upper correction device, a seventeen-roller, a tension roller, a CCD detection device, and a receiving platform two arranged sequentially along the lithium battery electrode conveying direction; two adjusting rollers are installed on the front and rear sides of the receiving platform two respectively; the upper cutting device is located on the upper and lower sides of the receiving platform two; the lower cutting assembly has the same structure as the upper cutting assembly.

[0011] In a further improvement, the upper winding assembly includes roller 10, roller 9, roller 11 and upper winding air shaft arranged sequentially along the lithium battery electrode conveying direction; an upper powder brushing device is installed between roller 10 and roller 9, and the lower winding assembly has the same structure as the upper winding assembly.

[0012] As a further improvement, the frame is fixed to the base plate.

[0013] In a further improvement, the pendulum roller assembly includes a rotating shaft, a swing arm connected to a rotating shaft on the rotating shaft, and a roller connected to a rotating shaft below the swing arm.

[0014] A method of using a lithium battery electrode multiple slitting machine, the structure of which is shown above, specifically includes the following steps: Step 1: Unwind the lithium battery electrode using the unwinding assembly; Step 2: The first cutting blade assembly cuts the lithium battery electrode sheet from the middle. When there are two coating areas on the lithium battery electrode sheet, the blank area in the middle is cut. When there are three coating areas, the coating area in the middle and the blank area adjacent to the coating area in the middle are cut. Step 3: The upper and lower cutting blade assemblies cut the two uncut coating areas separately; Step 4: The upper winding assembly and the lower winding assembly respectively wind up the cut lithium battery electrode sheets.

[0015] Advantages of this invention: This invention represents a significant advancement in electrode slitting and winding. Firstly, during electrode slitting, the coated area, including the blanked area, exhibits high cutting precision, easily ensuring minimal error in the finished electrode (and error in the blanked area is permissible; when cutting six strips, three blades can only guarantee the cutting precision of the middle cutter). This capability stems from the design of the cutting method, including two-stage cutting and a flattening roller adjusting the electrode before the second slitting, ensuring the electrode enters the cutter in an ideal state. Secondly, the unwinding assembly of this invention features an electrode buffer function, and the designed pendulum roller effectively fulfills its role. Furthermore, during electrode winding, a single air-expansion shaft winds two electrodes, greatly saving on the use of air-expansion shafts and significantly reducing costs. Furthermore, due to the adjustable cutter position, this invention offers significant advantages. It can accommodate various electrode widths, even when the electrode coating needs to be slit into four equal parts. Ideally, regardless of the electrode width, the slitting machine can cut the electrode without modifying the equipment, achieving the required uniform electrode division and producing electrodes of different widths. In practical production, this invention demonstrates strong adaptability, primarily because the electrode size and cutting method are not limited, and the equipment can be customized according to production needs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a lithium battery electrode sheet slitting machine according to the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of a lithium battery electrode sheet slitting machine according to the present invention.

[0018] Figure 3 This is a schematic diagram of the overall structure of a lithium battery electrode sheet slitting machine according to the present invention. Figure 1 .

[0019] Figure 4 This is a schematic diagram of the overall structure of a lithium battery electrode sheet slitting machine according to the present invention. Figure 2 .

[0020] Figure 5 This is a schematic diagram of the electrode sheet and its cutting in Example 1. Figure 6 This is a schematic diagram of the overall structure of a lithium battery electrode slitting machine. Figure 7 This is a schematic diagram of the electrode sheet and its cutting in Example 2.

[0021] Figure 8 This is a schematic diagram of the first cutting blade assembly of a lithium battery electrode sheet slitting machine of the present invention.

[0022] Figure 9 This is a schematic diagram of the upper cutting blade assembly and the upper winding assembly of a lithium battery electrode sheet slitting machine according to the present invention. Detailed Implementation

[0023] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments.

[0024] Example 1 Reference Figure 1 This application provides a lithium battery electrode sheet slitting machine, comprising: Controllers, such as PLC (Programmable Logic Controller), can process various received signals and then output control signals to control corresponding devices to operate.

[0025] The frame 14 is used to support the various components that make up the lithium battery electrode sheet slitting machine, and is generally a vertically arranged panel.

[0026] The frame 14 is vertically mounted on the base plate 18, so that all components are within the space enclosed by the frame 14 and the base plate 18. The frame is equipped with foot pedals 19 and 20, which provide space for workers to stand, observe, and operate the equipment, facilitating maintenance, electrode threading, and component replacement. The electrode 4 can pass under these two foot pedals.

[0027] The unwinding assembly 1 includes an unwinding air shaft 1, a guide roller 2, a receiving table 15, a tension roller 5, a drive roller 6, and a drive pressure roller 7. The unwinding air shaft 1 unwinds the collected, uncut electrode sheets, i.e., the electrode sheets. The electrode sheets leave the unwinding air shaft 1 and are connected to the guide roller 2 using existing technology. The guide roller 2 is fixed on the frame 14 and positioned above the unwinding air shaft 1. After passing through the guide roller 2, the electrode sheets sequentially pass through the receiving table 15, guide roller one 21, guide roller two 22, pendulum roller assembly 16, guide roller three 23, and guide roller four 24. The pendulum roller assembly 16 is positioned to ensure that the electrode sheets exiting the air shaft can withstand the tension of the drive roller 6 of the first cutting assembly.

[0028] The pendulum roller assembly 16 includes a rotating shaft 161, a swing arm 162 connected to the rotating shaft 161, and a roller 163 connected to the rotating shaft below the swing arm 162. The roller 163 is subjected to gravity and will exert a certain pulling force on the electrode sheet it passes through, thereby making it taut. When the pulling force increases, it will swing under force, thereby preventing the electrode sheet from being pulled off.

[0029] The first cutting assembly II includes a guide roller 25, a tension roller 5, a drive roller 6, a drive pressure roller 7, three adjusting guide rollers 8, and a first cutting device 9. The drive roller 6 and drive pressure roller 7 provide driving force and pressure to the electrode sheet. The drive roller 6 and drive pressure roller 7 press the electrode sheet, causing it to deform, and the diameter of the drive roller 6 is larger than the diameter of the drive pressure roller 7. Since the electrode sheet needs to be aligned with the middle position of the first cutting device 9 before entering it, the two adjusting guide rollers 8 before and after the first cutting device 9 must be horizontally aligned. After passing through the first cutting device, the electrode sheet is divided into four electrode sheets: the third electrode sheet, the fourth electrode sheet, the upper electrode sheet, and the lower electrode sheet. When cutting the electrode sheet 4 for the first time, three cutters are needed to cut simultaneously, but the two cutters on the side only need to cut the blank area. Since the blank area is relatively large and does not require high precision, the middle cutter only needs to cut to the set position of the electrode sheet 4 to complete the cut. Finally, the upper and fourth electrodes connect to the upper cutting assembly, while the third and lower electrodes connect to the lower cutting assembly.

[0030] The upper cutting assembly III includes roller 7 (27), roller 16 (216), upper flattening roller (10), upper correction device (3), roller 17 (217), tension roller (51), CCD detection device, receiving platform (15), four adjusting rollers (8), and upper cutting device (12). The upper electrode sheet passes through roller 7 (27), roller 16 (216), upper flattening roller (10), upper correction device (3), tension roller (51), CCD detection device (17), receiving platform (151), and adjusting rollers (8) before reaching the upper cutting device (12). The upper cutting device (12) cuts the upper electrode sheet into two parts, a first electrode sheet and a second electrode sheet. The upper correction device (3) and upper CCD detection device (17) adjust the upper electrode sheet to the appropriate position through a control system, ensuring that the upper cutting device (12) can divide the coated area of ​​the upper electrode sheet into two electrode sheets of the required size. After passing through roller 7 27, roller 16 216, and upper flattening roller 10, the second electrode sheet directly reaches roller 9 29 of the upper winding assembly without passing through other devices of the upper cutting assembly.

[0031] The upper winding assembly IV includes roller 9 29, roller 10 210, roller 11 211, upper powder brushing device 13, and upper winding air expansion shaft 11. The upper electrode sheet forms a first electrode sheet and a second electrode sheet after exiting the upper cutter. The second electrode sheet passes through an adjusting roller 8 and then through the upper powder brushing device 13. The upper powder brushing device 13 needs to align the roller 10 210 and also uses a roller 9 29 for alignment after the powder brushing device 13. The function of the upper powder brushing device 13 is to brush powder onto the second electrode sheet separated from the upper electrode sheet, the sixth electrode sheet separated from the lower electrode sheet, and the fourth electrode sheet separated from the electrode sheet 4. After the second, fourth, and sixth electrode sheets pass through the upper powder brushing device 13 together, they are collected together by rotation on the final upper winding air expansion shaft 11. The other part of the first electrode sheet of the upper electrode sheet leads to the lower winding assembly and is collected on the lower winding air expansion shaft 111.

[0032] The lower cutting assembly V includes a guide roller 15 215, a lower correction device 31, a lower flattening roller 101, a tension roller 52, a CCD detection device, a receiving platform 15, four adjusting guide rollers 8, and a lower cutting device 121. The lower electrode sheet passes through the guide roller 15, the lower flattening roller 101, the lower correction device 31, the tension roller 52, the lower CCD detection device 171, the receiving platform 152, and the adjusting guide rollers 8 before reaching the lower cutting device 121. The lower cutting device 121 cuts the lower electrode sheet into two parts, namely a fifth electrode sheet and a sixth electrode sheet. The sixth electrode sheet passes through the adjusting guide roller 8 to the upper winding assembly, and the fifth electrode sheet passes through another adjusting guide roller 8 to the lower winding assembly. The lower correction device 131 and the lower CCD detection device 171 adjust the lower electrode sheet to the appropriate position through the control system to ensure that the lower cutting device 121 can divide the coated area of ​​the lower electrode sheet into two electrode sheets of the required size. The third electrode sheet passes through roller 15 215 and flattening roller 101 and then directly connects to roller 12 212 of the lower winding device.

[0033] The lower take-up assembly VI includes roller 12 212, roller 13 213, roller 14 214, a lower powder brushing device 131, and a lower take-up air shaft 111. The lower electrode sheet, formed after exiting the lower cutter, consists of two electrode sheets. One of these, the fifth electrode sheet, passes through an adjusting roller 8, around roller 12 212, through the lower powder brushing assembly, and then through rollers 13 213 and 14 214 to reach the lower take-up air shaft 111. The electrode sheet needs to be aligned with roller 12 212 before passing through the lower powder brushing device 131, and also needs to be aligned after the powder brushing device. A roller 13213 is used for alignment. The function of the lower powder brushing device 131 is to brush powder onto a portion of the lower electrode sheet and a portion of the upper electrode sheet, namely the fifth, third, and first electrode sheets. The portion of the lower electrode sheet (the fifth electrode sheet), the portion of the upper electrode sheet (the third electrode sheet), and the portion of the electrode sheet 4 (the first electrode sheet) pass through the lower powder brushing device 131 and are collected together by rotation on the final lower take-up air expansion shaft 111. The other portion of the lower electrode sheet (the sixth electrode sheet) leads to the upper take-up assembly and is collected on the upper take-up air expansion shaft 11.

[0034] It is worth noting that the inspection equipment before cutting the electrode sheets described in this invention is not limited to a CCD inspection device, but can also be other devices commonly used by those skilled in the art, and is therefore not limited thereto. Firstly, the correction device and CCD inspection device used in this invention can be controlled independently. In addition to evenly dividing the electrode sheets, the upper correction device 3 and lower correction device 31 can be independently controlled by the control system. This means that the upper and lower electrode sheets can be cut into coating areas of different widths, resulting in uneven electrode sheet cutting. This invention can achieve standardized mass production to meet various electrode sheet cutting requirements. Secondly, the large spacing between different components is to accommodate space constraints during manual operation. Therefore, the footplate on the base plate is also extremely useful for this invention, reducing the complex operations of workers when threading electrode sheets and making the replacement of mechanical parts more convenient. Considering the large number of electrode sheets to be cut in this invention, and the numerous devices and parts required, the design to reduce parts involves allowing pre-cut electrode sheets and sheets to be cut to pass through the upper and lower cutting assemblies, significantly reducing equipment costs and improving production efficiency. Furthermore, the upper and lower winding assemblies can each collect three electrode sheets, further reducing costs. Therefore, the cost control effect of this invention is significant.

[0035] Among them, such as Figure 5 As shown, the first cutting device has three cutting paths 1011, while the upper cutting device has one cutting path 102 and the lower cutting device has one cutting path 103.

[0036] Example 2 like Figure 6 and Figure 7 As shown, based on Example 1, a lithium battery electrode sheet slitting machine can be used. Specifically, the cutting method involves first cutting the central blank area 42, then cutting the coating area 41, thus finally slitting it into four strips. Figure 7 As shown, the first cutting device cutting path 1011, the upper cutting device cutting path 102, and the lower cutting device cutting path 103 are all one.

[0037] The above is only one specific implementation method of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing the protection scope of the present invention.

Claims

1. A lithium battery electrode sheet multiple slitting machine, characterized in that, Includes a frame (14), on which an unwinding assembly, a first cutter assembly, an upper cutter assembly, a lower cutter assembly, an upper winding assembly and a lower winding assembly are arranged sequentially along the transmission direction of the lithium battery electrode (4); The lithium battery electrode (4) includes three coating areas (41), and blank areas (42) are formed between adjacent coating areas (41) and on the outside of the outermost coating area (41). The first cutter assembly includes a drive roller (6), a drive pressure roller (7) installed in conjunction with the drive roller (6), and a first cutter device (9). The diameter of the drive roller (6) is larger than the diameter of the drive pressure roller (7). Adjustment rollers (8) are installed on both the front and rear sides of the first cutter device (9). When the lithium battery electrode slitting machine is a lithium battery electrode slitting machine that splits one-to-six sheets, the first cutting device (9) includes three cutting blades arranged side by side. The first cutting device (9) first cuts the coating area (41) in the middle and the blank area (42) adjacent to the coating area (41), and then uses the upper cutting assembly and the lower cutting assembly to cut the two uncut coating areas (41) separately.

2. The lithium battery electrode sheet multiple slitting machine as described in claim 1, characterized in that, The unwinding assembly includes an unwinding air shaft (1), a roller (2), a receiving table (15), a first roller (21), a second roller (22), and a pendulum roller assembly (16) arranged sequentially along the transmission direction of the lithium battery electrode (4).

3. A lithium battery electrode sheet multiple slitting machine as described in claim 1, characterized in that, The first cutting assembly also includes a five-roller (25) and a tension roller (5) arranged sequentially along the transmission direction of the lithium battery electrode (4).

4. A lithium battery electrode sheet multiple slitting machine as described in claim 1, characterized in that, The upper cutting assembly includes roller seven (27), roller sixteen (216), upper flattening roller (10), upper correction device (3), roller seventeen (217), tension roller (51), CCD detection device, receiving platform two and upper cutting device (12) arranged sequentially along the transmission direction of the lithium battery electrode (4); two adjusting rollers (8) are installed on the front and rear sides of the receiving platform two respectively; the upper cutting device (12) is located on the upper and lower sides of the receiving platform two; the lower cutting assembly has the same structure as the upper cutting assembly.

5. A lithium battery electrode sheet multiple slitting machine as described in claim 1, characterized in that, The upper winding assembly includes roller 10 (210), roller 9 (29), roller 11 (211) and upper winding air shaft (11) arranged sequentially along the transmission direction of the lithium battery electrode (4); an upper powder brushing device (13) is installed between roller 10 (210) and roller 9 (29), and the lower winding assembly has the same structure as the upper winding assembly.

6. The lithium battery electrode sheet multiple slitting machine according to claim 1, characterized in that, The frame (14) is fixed on the base plate (18).

7. A lithium battery electrode sheet multiple slitting machine according to claim 2, characterized in that, The pendulum roller assembly (16) includes a rotating shaft (161), a swing arm (162) is connected to the rotating shaft (161) via a rotating shaft, and a roller (163) is connected to the rotating shaft below the swing arm (162).

8. A method of using a lithium battery electrode multiple slitting machine, characterized in that, The lithium battery electrode sheet multiple slitting machine according to any one of claims 2-7 specifically includes the following steps: Step 1: Unwinding the lithium battery electrode sheet (4) using the unwinding assembly; Step 2: The first cutting assembly cuts the lithium battery electrode (4) from the middle. When there are three coating areas (41), the coating area (41) in the middle and the blank area (42) adjacent to the coating area (41) in the middle are cut. Step 3: The upper and lower cutting blade assemblies cut the two uncut coating areas (41) separately; Step 4: The upper winding assembly and the lower winding assembly respectively wind up the cut lithium battery electrode sheets.

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