An electric cell production line

Abstract

The application provides a coating and slitting integrated machine and a battery cell production line, and relates to the technical field of batteries.The coating and slitting integrated machine comprises a first unwinding device, a coating device, a drying device, a slitting device and a winding device arranged in sequence.The first unwinding device is used for unwinding a material belt in a roll.The coating device is used for coating an active material on the material belt.The drying device is used for drying the active material layer on the material belt.The slitting device is used for slitting the dried material belt into pole pieces, and the slitting position of the slitting device at least includes the active material coating area of the material belt.The winding device is used for winding the pole pieces after being slitted by the slitting device to form a pole piece roll.The material belt unwound by the first unwinding device is sequentially coated, dried and slitted, and then wound.The first unwinding device, the coating device, the drying device, the slitting device and the winding device are arranged in sequence, only one winding and unwinding is performed in the above process, the number of winding and unwinding is reduced, the process is simple, and the equipment layout is simple.

Description

Technical Field

[0001] This application relates to the field of battery cell technology, specifically to a coating and slitting integrated machine and a battery cell production line. Background Technology

[0002] In the lithium battery production process, the current collector strip is unwound, the battery active material is coated onto the current collector foil, and then it is wound up. The electrode roll is then transferred to the slitting equipment for unwinding and longitudinal slitting, and then wound up again. In other words, the process of processing the current collector strip into electrode sheets involves multiple winding and unwinding of the strip and electrode sheets. The winding and unwinding steps are numerous and the process is complex, requiring a larger buffer and a complex and diverse equipment layout. Summary of the Invention

[0003] In view of this, this application provides a coating and slitting integrated machine, which solves the problems of multiple and complex winding and unwinding steps and a wide variety of complex equipment. This application also provides a battery cell production line including the above-mentioned coating and slitting integrated machine.

[0004] To achieve the above objectives, this application provides the following technical solution: A coating and slitting integrated machine includes a first unwinding device, a coating device, a drying device, a slitting device, and a winding device arranged sequentially; wherein... The first unwinding device is used to unwind the rolled material strip; The coating device is used to coat the active material onto the strip; The drying device is used to dry the active material layer on the material belt; The slitting device is used to slit the dried material strip into electrode sheets, and the slitting position of the material strip by the slitting device includes at least the active material coating area of ​​the material strip; The winding device is used to wind up the electrode sheets after they have been cut by the slitting device to form an electrode sheet roll; The strip released by the first unwinding device is successively coated, dried and slit before being rewound.

[0005] Optionally, a die-cutting device may be provided between the slitting device and the winding device, the die-cutting device being used to cut electrode tabs on the electrode sheet after it has been slitted by the slitting device.

[0006] Optionally, it also includes a die-cutting device located at the same station as the slitting device, wherein the slitting of the strip by the slitting device and the processing of the tabs by the die-cutting device are performed synchronously.

[0007] Optionally, the slitting device includes a laser or a cutter for slitting the strip along its length.

[0008] A battery cell production line includes a roll forming machine and a coating and slitting machine as described above, wherein a die-cutting device is provided on one of the coating and slitting machines and the roll forming machine.

[0009] Optionally, the roll forming machine includes a second unwinding device and a roll forming device arranged sequentially; The second unwinding device is used to unwind the electrode sheet into an electrode sheet, and the rolling device is used to roll the coating area of ​​the electrode sheet.

[0010] Optionally, the roll forming machine further includes a die-cutting device disposed between the second unwinding device and the roll forming device, the die-cutting device being used to cut electrode tabs on the electrode sheet after it has been unwound by the second unwinding device.

[0011] Optionally, the roll forming machine further includes a winding device or a stacking device located at the next station of the die-cutting device. The winding device is used to process the electrode sheet rolled by the roll forming device into a winding structure, and the stacking device is used to process the electrode sheet rolled by the roll forming device into a stacked structure.

[0012] Optionally, the roll forming machine further includes a die-cutting device located at the next station of the roll forming device, the die-cutting device being used to cut electrode tabs on the electrode sheet after it has been rolled by the roll forming device.

[0013] Optionally, the roll forming machine further includes a winding device or a stacking device located at the next station of the die-cutting device. The winding device is used to process the electrode sheet rolled by the roll forming device into a winding structure, and the stacking device is used to process the electrode sheet rolled by the roll forming device into a stacked structure.

[0014] Optionally, the die-cutting device includes a laser or metal mold for cutting tabs on the electrode sheet.

[0015] The coating and slitting integrated machine provided in this application arranges the first unwinding device, coating device, drying device, slitting device and winding device in sequence. The above devices work together to process the material strip into electrode rolls. In the above process, only one winding and unwinding is performed, which reduces the number of winding and unwinding operations, simplifies the process and streamlines the equipment layout. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the coating and slitting machine provided in this embodiment.

[0018] Figure 2 This is a schematic diagram of a coating and slitting machine according to another embodiment.

[0019] Figure 3 This is a schematic diagram of a roll forming machine.

[0020] Figure 4 This is a schematic diagram of a die-cutting device cutting electrode tabs in one configuration.

[0021] Figure 5 This is a schematic diagram of a die-cutting device cutting tabs in another configuration.

[0022] Figure 6 This is a schematic diagram showing the simultaneous cutting of electrode tabs by the die-cutting device and the slitting of the material strip by the slitting device.

[0023] exist Figures 1-6 middle: 1-Coating and slitting integrated machine, 2-Roll forming and core forming integrated machine, 3-Material strip, 4-Electrode sheet, 5-Electrode sheet roll, 6-Electrode tab; 11-First unwinding device, 12-Coating device, 13-Slitting device, 14-Rewinding device, 15-Die-cutting device, 21-Second unwinding device, 22-Rolling device, 23-Winding device, 24-Layering device, 31-First tab area, 32-Second tab area, 33-Coating area. Detailed Implementation

[0024] This application provides a coating and slitting integrated machine. This application also provides a battery cell production line including the above-described coating and slitting integrated machine.

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] like Figures 1 to 6As shown in the figure, this application embodiment provides a coating and slitting integrated machine 1, which is part of a battery cell production line. The coating and slitting integrated machine 1 is used to process the current collector strip 3 into electrode sheets 4. The coating and slitting integrated machine 1 mainly includes a first unwinding device 11, a coating device 12, a drying device (not shown in the figure), a slitting device 13, and a winding device 14 arranged in sequence. Specifically, the first unwinding device 11 is used to unwind the rolled strip 3. The strip 3 can be either a positive electrode current collector strip 3 or a negative electrode current collector strip 3. Taking lithium-ion batteries as an example, generally, the positive electrode current collector is aluminum foil and the negative electrode current collector is copper foil. The coating device 12 is used to coat the active material onto the strip 3. The coating device 12 includes a coating die for coating the active material onto the current collector strip 3. The positive electrode active material is generally lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, lithium nickel oxide, lithium nickel cobalt manganese oxide, etc., and the negative electrode active material is... The material is generally graphite, lithium titanate, or a carbon material with a similar graphite structure; the drying device is used to dry the active material layer on the strip 3, and the drying device is generally an oven, but a laser can also be used to heat the active material layer to achieve drying; the slitting device 13 is used to slit the dried strip 3 into electrode sheets 4, and the slitting position of the strip 3 by the slitting device 13 at least includes the active material coating area of ​​the strip 3. The slitting device 13 slits the strip 3 into multiple electrode sheets 4 along the length direction of the strip 3, and the length direction of the strip 3 refers to... Figure 1 The direction indicated by the double-headed arrow A; the winding device 14 is used to wind up the electrode sheet 4 after being cut by the slitting device 13 to form the electrode sheet roll 5; the first unwinding device 11, coating device 12, drying device, slitting device 13 and winding device 14 in the coating and slitting integrated machine 1 work together to process the material strip 3 into the electrode sheet roll 5. The material strip 3 released by the first unwinding device 11 is coated, dried and slitted in sequence before being wound up. The material strip 3 is processed by the coating and slitting integrated machine only undergoes one winding and unwinding process.

[0027] It should be noted that in the battery cell production process, the active material layer is coated onto the current collector and then wound up. Afterwards, the current collector coated with the active material is dried by a drying device and then wound up again. Finally, a rolling operation is performed on the electrode 4 to compact the active material layer on the current collector. This coating and slitting integrated machine 1 includes a first unwinding device 11, a coating device 12, a drying device, a slitting device 13, and a winding device 14 arranged sequentially. This coating and slitting integrated machine 1 does not include a rolling device 22, because the rolling and coating rates are different, and the pressure rollers during rolling... The pressure is very high, and the thickness of the coated and uncoated areas of the electrode is inconsistent. This causes the coated area to contact the pressure roller during rolling, while the uncoated area does not. The coated area is compacted to a certain extent under the pressure of the pressure roller, and the current collector also extends to a certain extent. However, the uncoated area does not contact the pressure roller and does not extend effectively. Wrinkles will form between the extended and unextended areas, especially in the middle uncoated area where the wrinkles are more severe, resulting in a decrease in the electrode qualification rate. Adding a rolling device 22 to the above-mentioned coating and slitting machine 1 may also cause the coating and rolling to be unable to be carried out synchronously, resulting in tape breakage.

[0028] It should also be noted that, taking the cutting of the strip 3 into four electrode sheets 4 by the slitting device 13 as an example, this can be achieved by setting two staggered winding devices 14, with each winding device 14 having two parts that respectively complete the winding of two electrode sheets 4. For specific settings, please refer to [link / reference]. Figure 1 Alternatively, a winding device 14 can be set up to wind up the four electrode sheets 4 at four different locations. For details on the setup, please refer to [link to documentation]. Figure 2 Of course, four winding devices 14 can also be set up to wind up four electrode sheets 4, that is, one winding device 14 winds up one electrode sheet 4.

[0029] It should also be noted that the slitting device 13 can slit the active material coated area of ​​the material strip 3, and the uncoated area of ​​the material strip 3. The slitting device 13 can also slit the active material coated area and the uncoated area of ​​the material strip 3.

[0030] The coating and slitting integrated machine 1 with the above structure arranges the first unwinding device 11, coating device 12, drying device, slitting device 13 and winding device 14 in sequence. The above devices work together to process the material strip 3 into electrode rolls 5. In the above process, only one winding and unwinding are performed, reducing the number of winding and unwinding operations, simplifying the process and streamlining the equipment layout.

[0031] Furthermore, in some embodiments, the coating and slitting machine 1 further includes a die-cutting device 15 disposed between the slitting device 13 and the winding device 14. The die-cutting device 15 is used to cut out electrode tabs 6 on the electrode sheet 4 after it has been slitted by the slitting device 13. Specifically, the coating and slitting machine 1 includes a die-cutting device 15, which is located between the slitting device 13 and the winding device 14. The die-cutting device 15 is used to cut out the electrode tabs 6 in the electrode tab area of ​​the electrode sheet 4 after it has been slitted by the slitting device 13.

[0032] It should be noted that if the coating and slitting machine 1 is not equipped with a die-cutting device 15 for cutting out the tabs 6, after the coating and slitting machine 1 processes the strip 3 into the electrode roll 5, it is necessary to roll the coating area 33 of the electrode 4. However, due to the different thicknesses of the coating area 33 and the tab area of ​​the electrode 4, wrinkles will be caused in the uncoated area of ​​the electrode 4 during the rolling process. The uncoated area refers to the first tab area 31 and the second tab area 32. Then, the tab area of ​​the electrode 4 needs to be stretched and wrinkled before or after rolling. After that, the tab area is cut by the die-cutting device 15 to form the tabs 6 on the electrode 4. In this solution, the tabs 6 of the electrode sheet 4 are first cut by the die-cutting device 15, and then the coating area 33 of the electrode sheet 4 is rolled. Since the tabs 6 have been cut and the size of the tabs 6 is small, the stretching tension can be effectively released. Even if there are slight wrinkles, it will not affect the performance of the tabs 6. Therefore, the die-cutting device 15 is set in the coating and slitting machine 1, and there is no need to set up a wrinkle removal device to remove wrinkles in the wrinkled area of ​​the electrode sheet 4, thereby reducing subsequent steps and improving the efficiency of battery cell production.

[0033] It should also be noted that, taking the cutting of the material strip 3 into four electrode sheets 4 as an example, regarding the cutting method of the electrode tab 6, in the width direction of the material strip 3 ( Figure 6 (In the direction indicated by the double-headed arrow B) The strip 3 coated with active material is composed of a first tab region 31, a coating region 33, a second tab region 32, a coating region 33, and the first tab region 31 in sequence. The first tab region 31 refers to the tab region located at the edge of the strip 3, and the second tab region 32 refers to the tab region located in the middle of the strip 3. The die-cutting device 15 can either cut the tabs 6 located in the first tab region 31 first and then cut the tabs 6 located in the second tab region 32, or cut the tabs 6 located in the second tab region 32 first and then cut the tabs 6 located in the first tab region 31 (see [link]). Figure 5 (See the schematic diagram shown). The tabs 6 of the first tab region 31 and the second tab region 32 can also be cut simultaneously (see [reference]). Figure 4 (See the schematic diagram shown).

[0034] Alternatively, the die-cutting device 15 can be omitted, and the tab 6 can be cut in subsequent steps. The tab 6 can also be installed by welding it to the electrode plate 4.

[0035] Furthermore, in some embodiments, the coating and slitting integrated machine 1 also includes a die-cutting device 15 located at the same station as the slitting device 13. The slitting of the strip 3 by the slitting device 13 and the processing of the tabs 6 by the die-cutting device 15 are performed simultaneously. Taking the cutting of the strip 3 into four electrode sheets 4 as an example, a preferred embodiment is provided. While the slitting device 13 cuts the middle of the two coating areas of the strip 3, the die-cutting device 15 simultaneously cuts the two first tab areas 31 and one second tab area 32. Thus, the slitting device 13 and the die-cutting device 15 act on the strip 3 to process it into four electrode sheets 4 with tabs 6, which greatly improves the processing efficiency of the electrode sheets 4.

[0036] Here, the slitting device 13 slits the strip 3 and the die-cutting device 15 processes the tabs 6 simultaneously. This arrangement can improve the efficiency of cutting the electrode sheet 4 and processing the tabs 6. Furthermore, by placing the two devices at the same workstation, the number of workstations is reduced, the floor space of the coating, slitting, and integrated machine is reduced, and the overall layout is made more streamlined. Performing the two steps simultaneously improves the efficiency of battery cell production.

[0037] Regarding the specific structure of the die-cutting device 15, the die-cutting device 15 can cut the tab 6 using a laser or a metal mold. When the die-cutting device 15 cuts the tab 6 using a laser, the splitting and die-cutting of the intermediate electrode 4 can be performed simultaneously, that is, the laser can simultaneously split and cut the electrode 4 along a specific path.

[0038] In some embodiments, the slitting device 13 includes a laser or cutter for slitting the strip 3 along its length. Specifically, the length direction of the strip 3 refers to... Figure 1 As indicated by the bidirectional arrow A, the slitting device 13 can be equipped with either a laser to cut the strip 3 or a cutter to cut the strip 3. Normally, during the cutting process of the strip 3, the cutter is prone to leaving active substances or current collectors on it. As the cutting time and the number of cuts increase, the cutter needs to be replaced. However, replacing the cutter may scratch the operator, posing a certain safety hazard. Using a laser to cut the strip 3 can improve the cutting efficiency and avoid scratching the operator during replacement, thus improving safety.

[0039] Furthermore, the slitting device 13 slits the strip 3 into multiple electrode sheets 4 along its length. After slitting, the multiple electrode sheets 4 are positioned close together, which is not conducive to the winding device 14 winding them up. The slitting device 13 also includes an adjusting component, which is used to adjust the position and / or angle of the slitting electrode sheets 4 to ensure a certain distance between them, thereby facilitating the winding device 14 to wind them up. Specifically, the adjusting component can be multiple adjusting rollers with an inclination angle to the vertical plane, used to adjust the position of the multiple electrode sheets 4; the adjusting component can also be a single roller with adjusting thread sections of different inclination angles on its surface. The slitting electrode sheets 4 move along the adjusting thread sections to create a tendency for the multiple electrode sheets 4 to separate, thus achieving adjustment of the slitting electrode sheets 4.

[0040] A battery production line includes a roll forming machine 2 and the aforementioned coating and slitting machine 1. Since the battery production line includes the aforementioned coating and slitting machine 1, the beneficial effects of the coating and slitting machine 1 on the battery production line are described above and will not be repeated here.

[0041] In addition, a die-cutting device 15 is provided on one of the coating and slitting integrated machine 1 and the roll forming integrated machine 2. That is, the die-cutting device 15 can be provided in the coating and slitting integrated machine 1 or the roll forming integrated machine 2, but only in one of the coating and slitting integrated machine 1 and the roll forming integrated machine 2, so as to cut the tabs 6 of the electrode sheet 4.

[0042] In some embodiments, the roll forming machine 2 includes a second unwinding device 21 and a roll forming device 22 arranged sequentially; wherein, the second unwinding device 21 is used to unwind the electrode roll 5 into an electrode 4, and the roll forming device 22 is used to roll forming the coating area 33 of the electrode 4. Specifically, after the coating and slitting machine 1 processes the strip 3 into an electrode roll 5, the electrode roll 5 is transferred to the second unwinding device 21 of the roll forming machine 2 for unwinding, thereby unfolding the electrode roll 5 into an electrode 4, and then the roll forming device 22 rolls and compacts the coating area 33 of the electrode 4. After the roller pressing and compacting machine 2 compacts the electrode sheet 4, it does not rewind it. Instead, it directly transports it to the next station on the battery cell production line, namely the winding station or the stacking station, to process the electrode sheet 4 into a battery cell with a winding structure or a stacked structure. With this setup, the number of winding devices 14 and unwinding devices 11 can be reduced during the battery cell processing and production process, thereby reducing the floor space of the battery cell production line, simplifying the layout of the battery cell production line, reducing the number of operation steps and auxiliary time in the battery cell production process, and improving the production efficiency of the battery cell.

[0043] In some embodiments, the roll forming machine 2 further includes a die-cutting device 15 disposed between the second unwinding device 21 and the roll forming device 22. The die-cutting device 15 is used to cut tabs 6 from the electrode sheet 4 after it has been unwound by the second unwinding device 21. Here, by disposing of the die-cutting device 15 between the second unwinding device 21 and the roll forming device 22, this embodiment also involves first cutting the tabs 6 of the electrode sheet 4 and then rolling the coating area 33 of the electrode sheet 4. Since the tabs 6 have already been cut and are relatively small, even slight wrinkles will not affect the performance of the tabs 6. Therefore, placing the die-cutting device 15 in the coating and slitting machine 1 can reduce the wrinkle removal process of the wrinkled area of ​​the electrode sheet 4, reduce subsequent steps, and improve the efficiency of battery cell production.

[0044] It should be noted that when the die-cutting device 15 is set between the second unwinding device 21 and the roller pressing device 22, the coating and slitting integrated machine 1 does not have a die-cutting device 15.

[0045] Furthermore, in some embodiments, when the die-cutting device 15 is disposed between the second unwinding device 21 and the rolling device 22, the rolling core forming machine 2 further includes a winding device 23 or a stacking device 24 disposed at the next station of the die-cutting device 15. The winding device 23 is used to process the electrode sheet 4 rolled by the rolling device 22 into a winding structure, and the stacking device 24 is used to process the electrode sheet 4 rolled by the rolling device 22 into a stacking structure.

[0046] On one hand, specifically, the winding device 23 is used to wind the electrode sheet 4 jointly processed by the coating and slitting integrated machine 1 and the roll forming integrated machine 2. When winding, the winding device 23 winds the positive electrode sheet 4, the separator, the negative electrode sheet 4, and the separator together to form a winding structure. It should be noted that the winding device 23 needs to be located at the next station after the roll forming device 22 of the roll forming integrated machine 2. With this setting, the electrode sheet 4 rolled by the roll forming device 22 can be directly wound, avoiding the need to rewind the electrode sheet 4 processed by the roll forming device 22 of the roll forming integrated machine 2 before unwinding. This reduces the number of rewinding devices 14 and unwinding devices, and the layout is simplified, resulting in high production efficiency of the winding structure.

[0047] Specifically, the stacking device 24 is used to stack the electrode sheets 4 jointly processed by the coating and slitting integrated machine 1 and the roll forming integrated machine 2. When stacking, the stacking device 24 alternately stacks the positive electrode sheet 4, the separator, and the negative electrode sheet 4 to form a stacked structure. It should be noted that the stacking device 24 needs to be located at the next station after the roll forming integrated machine 2. With this setting, the electrode sheets 4 rolled by the roll forming device 22 can be directly stacked, avoiding the need to wind up the electrode sheets 4 processed by the roll forming integrated machine 2 and then unwind them before stacking. This reduces the number of winding and unwinding devices 14, simplifies the layout, and increases the production efficiency of the stacked structure.

[0048] In some embodiments, the roll forming machine 2 further includes a die-cutting device 15 located at the next station of the roll forming device 22. The die-cutting device 15 is used to cut tabs 6 from the electrode sheet 4 after it has been rolled by the roll forming device 22. Specifically, in this embodiment, the roll forming machine 2 unwinds the electrode sheet roll 5, and then the roll forming device 22 rolls the coating area 33 of the electrode sheet 4. Since the tab areas are all located at the edge of the electrode sheet, the tension is released to a certain extent, and the wrinkles in the tab areas are not too severe. Furthermore, the tab areas are extended and wrinkled by the wrinkle removal device (not shown in the figure) before and after the roll forming to ensure that the extension amount is as consistent as possible. Then, the tabs 6 are cut from the tab areas of the electrode sheet 4 by the cutting device. Although this arrangement is more complicated than placing the cutting device in other parts, the flatness of the tabs 6 is better, which improves the forming quality of the battery cell made from the tabs 6 and the electrode sheet 4 and improves the performance of the battery cell. The tab areas refer to the first tab area 31 and the second tab area 32.

[0049] It should be noted that when the die-cutting device is set at the next station after the roller pressing device 22, and the coating and slitting integrated machine 1 does not have a die-cutting device 15, in other words, the die-cutting device 15 is set at only one position on the battery cell production line to cut the tabs 6.

[0050] Furthermore, in some embodiments, when the die-cutting device 15 is located at the next station after the rolling device 22, the rolling core forming machine 2 further includes a winding device 23 or a stacking device 24 located at the next station after the die-cutting device 15. The winding device 23 is used to process the electrode sheet 4 rolled by the rolling device 22 into a winding structure, and the stacking device 24 is used to process the electrode sheet 4 rolled by the rolling device 22 into a stacked structure. For a detailed description of the winding device and the stacking device, please refer to the description of the above embodiments, which will not be repeated here.

[0051] In some embodiments, the die-cutting apparatus 15 includes a laser or metal mold for cutting tabs 6 onto the electrode plate 4. Specifically, the laser refers to a laser that cuts tabs 6 onto a current collector, particularly a semiconductor laser. The metal mold refers to a part or article formed by pressing metal material into a desired shape.

[0052] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0053] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0054] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0055] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0056] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0057] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery cell production line, characterized in that, This includes an integrated coating and slitting machine and an integrated roll forming machine. The integrated coating and slitting machine comprises a first unwinding device, a coating device, a drying device, a slitting device, and a winding device arranged sequentially. The first unwinding device is used to unwind the rolled material strip; The coating device is used to coat the active material onto the strip; The drying device is used to dry the active material layer on the material belt; The slitting device is used to slit the dried material strip into electrode sheets, and the slitting position of the material strip by the slitting device includes at least the active material coating area of ​​the material strip; The winding device is used to wind up the electrode sheets after they have been cut by the slitting device to form an electrode sheet roll; The strip released by the first unwinding device is sequentially coated, dried, and slit before being rewound. The roll forming machine includes a second unwinding device and a roll forming device arranged in sequence; the second unwinding device is used to unwind the electrode sheet into an electrode sheet, and the roll forming device is used to roll the coating area of ​​the electrode sheet.

2. The battery cell production line according to claim 1, characterized in that, The coating and slitting integrated machine also includes a die-cutting device disposed between the slitting device and the winding device, the die-cutting device being used to cut electrode tabs on the electrode sheet after it has been slitted by the slitting device.

3. The battery cell production line according to claim 1, characterized in that, The coating and slitting integrated machine also includes a die-cutting device located at the same station as the slitting device. The slitting device cuts the material strip and the die-cutting device processes the tabs simultaneously.

4. The battery cell production line according to claim 1, characterized in that, The slitting device includes a laser or a cutter that slits the strip along its length.

5. The battery cell production line according to any one of claims 1-4, characterized in that, A die-cutting device is provided on one of the coating and slitting integrated machines and the roll forming integrated machine.

6. The battery cell production line according to claim 1, characterized in that, The roll forming machine further includes a die-cutting device disposed between the second unwinding device and the roll forming device. The die-cutting device is used to cut electrode tabs on the electrode sheet after it has been unwound by the second unwinding device.

7. The battery cell production line according to claim 6, characterized in that, The roll forming machine further includes a winding device or a stacking device located at the next station of the die-cutting device. The winding device is used to process the electrode sheet rolled by the roll forming device into a winding structure, and the stacking device is used to process the electrode sheet rolled by the roll forming device into a stacking structure.

8. The battery cell production line according to claim 1, characterized in that, The roll forming machine also includes a die-cutting device located at the next station of the roll forming device. The die-cutting device is used to cut electrode tabs on the electrode sheet after it has been rolled by the roll forming device.

9. The battery cell production line according to claim 8, characterized in that, The roll forming machine further includes a winding device or a stacking device located at the next station of the die-cutting device. The winding device is used to process the electrode sheet rolled by the roll forming device into a winding structure, and the stacking device is used to process the electrode sheet rolled by the roll forming device into a stacking structure.

10. The battery cell production line according to claim 5, characterized in that, The die-cutting device includes a laser or metal mold for cutting tabs on the electrode sheet.

Images