Pole piece forming apparatus

Abstract

The present application provides a sheet forming device, comprising a feeding unit, a slitting unit, a plurality of winding units, and a wrinkle removing unit. The feeding unit provides a parent sheet. The slitting unit slits the parent sheet into a plurality of sheets. The winding units pull a sheet belt. Each winding unit winds one corresponding sheet. The slitting unit is arranged between the feeding unit and the winding units. The wrinkle removing unit is arranged between the slitting unit and the winding units. The wrinkle removing unit comprises a first roller and a second roller which are oppositely arranged. The first roller comprises a first rolling part. The first rolling part and the second roller are used for rolling the edge of a slitting edge of a sheet. According to the sheet forming device provided by the present application, the slitting edge of the sheet is rolled by the first rolling part of the first roller and the second roller, so that the risk of forming wrinkles on a sheet after slitting of a parent sheet is effectively reduced, the yield of sheets is improved, and the safety of a battery, produced from the sheet, in a working process is improved.

Description

Pole piece forming equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 202111450643.2, filed on November 29, 2021, entitled “Pole piece forming equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of pole piece processing technology, and in particular to a pole piece forming device. Background Art

[0004] Batteries are widely used in electrical devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Batteries can include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and secondary alkaline zinc-manganese batteries.

[0005] In the development of battery technology, electrodes are an important component of batteries. Ensuring the smooth progress of various processes in the production process of electrodes, reducing the scrap rate in the production process of electrodes, and improving the product quality of electrodes are issues of continuous improvement in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a pole piece forming device that can improve the product quality of pole pieces and reduce the scrap rate during the pole piece production process.

[0008] The present application proposes a pole piece forming device, comprising: a material incoming device for providing a mother pole piece; a slitting device for slitting the mother pole piece into a plurality of pole pieces; a plurality of winding devices for pulling the pole piece on a tape, each winding device winding up a corresponding pole piece, and the slitting device is arranged between the material incoming device and the winding device; a wrinkle removal device, arranged between the slitting device and the winding device, and the wrinkle removal device comprises a first roller and a second roller arranged opposite to each other, the first roller comprises a first rolling portion, and the first rolling portion and the second roller are used to roll the edges of the cut sides of the pole piece.

[0009] The electrode forming equipment provided in the present application arranges a wrinkle removal device between the slitting device and the winding device, and the wrinkle removal device includes a first roller and a second roller arranged opposite to each other, and the slitting edges of the electrode are rolled by the first rolling part of the first roller and the second roller, thereby effectively reducing the risk of wrinkles on the electrode formed after the mother electrode is slit, improving the yield of the electrode, and improving the safety of the battery formed by the electrode production during operation.

[0010] In some embodiments, the diameter of the first rolling portion increases in the axial direction of the first roller. The largest diameter portion of the first rolling portion is used to roll the edges of the cut edges; the smaller diameter portion of the first roller is closer to the center of the electrode sheet. This arrangement allows the largest diameter portion of the first rolling portion to roll the edges of the cut edges, which are prone to wrinkling. After rolling by the wrinkle removal device, the stress distribution at the cut edges of the electrode sheet is more uniform, which helps improve the wrinkle removal effect of the electrode sheet.

[0011] In some embodiments, the first rolling portion is configured to have a diameter that changes from small to large through an arc-shaped transition structure or a step-shaped transition structure. Both the arc-shaped transition structure and the step-shaped transition structure can achieve the purpose of changing the diameter of the first rolling portion from small to large.

[0012] In some embodiments, in the axial direction of the first roller, the diameter of the first rolling portion first increases from small to large and then decreases from large to small. This arrangement allows one rolling portion to correspond to the edges of two electrode sheet cuts, simplifying the structure of the wrinkle removal device. Furthermore, the rolling pressure of the wrinkle removal device on the electrode sheet gradually decreases from the edge to the middle of the electrode sheet cuts, resulting in a more uniform stress distribution along the electrode sheet cuts after passing through the wrinkle removal device, further reducing the risk of wrinkles in the electrode sheet.

[0013] In some embodiments, the second roller includes a second rolling portion opposite the first rolling portion. The diameter of the second rolling portion increases from small to large in the axial direction of the second roller; the largest diameter portion of the second roller is opposite the largest diameter portion of the first roller. The first and second rolling portions can be configured to have the same shape and be positioned opposite each other. With this configuration, when the wrinkle removal device rolls the cut edge of the electrode sheet, the forces on both sides of the electrode sheet are more balanced. The stress release space along both sides of the electrode sheet during the wrinkle removal process is consistent, facilitating smooth de-wrinkling of the electrode sheet while reducing the likelihood of further wrinkling of the electrode sheet during the rolling process.

[0014] In some embodiments, a flow channel is provided within the first roller for circulating a heat-conducting medium, which is used for heat exchange with the first roller. This facilitates the removal of wrinkles from the cut edges of the electrode. Furthermore, heating of the electrode by the first roller can accelerate the embedding of active material into the electrode after lithium supplementation.

[0015] In some embodiments, the heat transfer medium exchanges heat with the first roller to maintain the surface temperature of the first roller near the electrode between 35°C and 40°C. This arrangement ensures the stress reloading process of the electrode and accelerates the embedding of the active material into the electrode while reducing the possibility of damage to the electrode structure due to excessive temperature.

[0016] In some embodiments, the flow channel is spirally arranged around the center line of the first roller. The spirally arranged flow channel has a larger area corresponding to the outer surface of the first roller, which is conducive to improving the heat exchange rate between the heat conducting medium and the first roller.

[0017] In some embodiments, the distance between the flow channel and the outer surface of the first roller is d, 0<d≤2mm. This can increase the heat exchange rate between the heat-conducting medium and the outer surface of the first roller, thereby increasing the heat exchange rate between the first roller and the pole piece.

[0018] In some embodiments, the electrode forming apparatus further comprises a lithium replenishing device, disposed between the material receiving device and the slitting device, for laminating the lithium ribbon onto the surface of the parent electrode. Integrating both the lithium replenishing and slitting processes within the electrode forming apparatus improves the structural integration of the electrode forming apparatus and simplifies the operational procedures during the electrode forming process.

[0019] In some embodiments, the electrode forming apparatus further includes a deflection correction device for guiding the electrode sheet's tape travel direction; the deflection correction device is disposed between the slitting device and the wrinkle removal device; and / or, the deflection correction device is disposed between the wrinkle removal device and the winding device. This arrangement achieves a better dewrinkling effect and reduces the likelihood of secondary wrinkles forming after the electrode sheet dewrinkling process is completed.

[0020] In some embodiments, the electrode forming equipment further includes a burr removal device disposed between the slitting device and the winding device. The burr removal device includes a brush mechanism for removing burrs from the slitting edge and a dust collection mechanism for collecting burrs removed by the brush mechanism. This reduces the risk of burrs freely flowing and affecting the cleanliness of the electrode production environment, and also reduces the risk of burrs landing on the surface of the electrode and puncturing the electrode during subsequent electrode processing.

[0021] In some embodiments, the electrode forming apparatus further includes: a gluing mechanism, disposed between the burr removal device and the winding device, for gluing the cut edges; and a drying device, disposed between the gluing mechanism and the winding device, for drying the glued electrode. This prevents the cut edges of the electrode from being exposed, reducing the risk of short circuits during subsequent electrode use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0023] FIG1 is a schematic structural diagram of a pole piece forming device provided in this embodiment;

[0024] FIG2 is a schematic diagram of the structure of a first roller and a second roller rolling a pole piece in a pole piece forming device provided in an embodiment of the present application;

[0025] 3 is a schematic diagram of the structure of a first roller and a second roller rolling a pole piece in another pole piece forming device provided in an embodiment of the present application;

[0026] FIG4 is a schematic structural diagram of a first roller and a second roller rolling a pole piece in another pole piece forming device provided in an embodiment of the present application;

[0027] FIG5 is a cross-sectional schematic diagram of a first roller in a pole piece forming device provided in an embodiment of the present application;

[0028] FIG6 is a schematic structural diagram of another pole piece forming device provided in an embodiment of the present application;

[0029] FIG7 is a schematic diagram of the structure of another pole piece forming device provided in an embodiment of the present application;

[0030] FIG8 is a structural principle diagram of another pole piece forming device provided in an embodiment of the present application.

[0031] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0032] Marking Description:

[0033] 1. Material receiving device; 2. Slitting device; 3. Wrinkle removal device; 31. First roller; 31a. First rolling section; 31b. Runner; 32. Second roller; 32a. Second rolling section; 4. Winding device; 5. Lithium replenishing device; 51. Lithium ribbon unwinding mechanism; 52. Release agent coating mechanism; 53. Pressing roller mechanism; 54. Traction film winding mechanism; 6. Deviation correction device; 7. Burr removal device; 71. Brush mechanism; 72. Dust collection mechanism; 8. Gluing mechanism; 9. Drying device;

[0034] 110, mother pole piece; 120, pole piece; 120a, cutting edge. DETAILED DESCRIPTION

[0035] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0036] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0037] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] Batteries, such as lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, have advantages such as high energy density, high power density, a high number of cycles, and long storage life, and are widely used in battery-compatible electrical devices. For example, electrical devices can include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Vehicles can be fuel-powered vehicles, gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles; spacecraft include aircraft, rockets, space shuttles, and spacecraft; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; and electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0039] During the battery production process, the battery electrodes need to go through processes such as coating, rolling, drying, and slitting. Some electrodes also need to be replenished with lithium.

[0040] After discovering that wrinkles appeared on the edges of the pole pieces produced during the production process, the inventors conducted a systematic analysis and research on the pole piece forming process and forming equipment. The results showed that after the mother pole piece undergoes lithium replenishment, coating or rolling processes, a certain amount of stress is stored inside. During the process of cutting the mother pole piece into pole pieces, the stress of the mother pole piece at the cutting point is instantly released. The cut edge of the pole piece thus formed is tension-free, while the stress on the side that has not passed through the cutting knife is not released. The stress release on both sides of the pole piece thus formed is inconsistent, and the stress distribution on both sides is different, which can easily cause the cut edge of the pole piece to form wrinkles such as wavy edges, collapsed edges or severe sinking. In particular, for pole pieces that have undergone the lithium replenishment process, the mother pole piece becomes brittle and hard after lithium replenishment, and the stress difference on the two sides of the pole piece formed after cutting is greater, and the risk of wrinkles in the pole piece is higher.

[0041] Based on the above problems discovered by the inventors, the inventors have improved the structure of the pole piece forming equipment, and the technical solution described in the embodiments of this application is applicable to the pole piece forming equipment.

[0042] FIG1 shows a schematic structural diagram of a pole piece forming device provided in an embodiment of the present application, and FIG2 shows a schematic structural diagram of a first roller 31 and a second roller 32 and a rolled pole piece 120 .

[0043] According to the electrode forming equipment provided in the embodiment of the present application, as shown in Figures 1 and 2, the electrode forming equipment includes a material incoming device 1, a slitting device 2, a plurality of winding devices 4 and a wrinkle removal device 3. The material incoming device 1 is used to provide the mother electrode 110. The slitting device 2 is used to cut the mother electrode 110 into a plurality of electrode sheets 120. The winding device 4 is used to pull the electrode 120 on a tape, and each winding device 4 winds up a corresponding electrode 120, and the slitting device 2 is arranged between the material incoming device 1 and the winding device 4. The wrinkle removal device 3 is arranged between the slitting device 2 and the winding device 4, and the wrinkle removal device 3 includes a first roller 31 and a second roller 32 arranged opposite to each other. The first roller 31 includes a first rolling portion 31a, and the first rolling portion 31a and the second roller 32 are used to roll the edges of the cutting edge 120a of the electrode 120.

[0044] Specifically, the slitting device 2 slits the mother electrode 110 into multiple electrode pieces 120 along the slitting edge 120a of the electrode piece 120. After the slitting is completed, wrinkles are easily generated on the edge of the slitting edge 120a of the electrode piece 120. The first rolling portion 31a of the first roller 31 and the second roller 32 clamp and roll the edge of the slitting edge 120a of the electrode piece 120 together. During the rolling process, the stress at the edge of the slitting edge 120a of the electrode piece 120 is redistributed, and the wrinkles on the slitting edge 120a are flattened.

[0045] It is understood that the structures and shapes of the first roller 31 and the second roller 32 are not limited. The shapes can be the same or different, as long as they can clamp and roll the edges of the cut edge 120a of the electrode sheet 120. For example, the first roller 31 and the second roller 32 can be cylindrical, truncated cone, or other irregular shapes. The first roller 31 and the second roller 32 can only roll the edges of the cut edge 120a of the electrode sheet 120, or they can roll the entire electrode sheet 120. Different rolling forms correspond to different structures of the first roller 31 and the second roller 32.

[0046] It should be noted that after the mother electrode sheet 110 is cut, two or more electrode sheets 120 can be formed. One first rolling portion 31a corresponds to rolling the edges of the two cut edges 120a of two adjacent electrode sheets 120. When the number of electrode sheets 120 formed after cutting is three or more, the first roller 31 can be provided with multiple first rolling portions 31a so that each edge of the cut edge 120a has a corresponding first rolling portion 31a for rolling. Of course, it is also possible to provide one first roller 31 with one first rolling portion 31a, and provide multiple first rollers 31, with each first roller 31 corresponding to the edge of the cut edge 120a of two adjacent electrode sheets 120.

[0047] The electrode forming equipment provided in the embodiment of the present application is configured to arrange a wrinkle removal device 3 between the slitting device 2 and the winding device 4, and the wrinkle removal device 3 is configured to include a first roller 31 and a second roller 32 arranged relatively to each other, and the slitting edge 120a of the electrode 120 is rolled by the first rolling portion 31a of the first roller 31 and the second roller 32, thereby effectively reducing the risk of wrinkles in the electrode 120 formed after the mother electrode 110 is slit, improving the yield of the electrode 120, and improving the safety of the battery formed by the electrode 120 during operation.

[0048] In some embodiments, the diameter of the first rolling portion 31a increases from small to large in the axial direction of the first roller 31. The largest diameter portion of the first rolling portion 31a is used to roll the edge of the cut edge 120a. The smaller diameter portion of the first roller 31 is closer to the center of the pole piece 120.

[0049] It is understood that the stress release at the edge of the cutting edge 120a of the pole piece 120 is most complete, and therefore the amplitude of the wrinkles is also the most obvious. The closer to the edge of the pole piece 120, the more severe the wrinkles of the pole piece 120. Therefore, the diameter of the first rolling portion 31a is set to increase from small to large, and the portion with the largest diameter of the first rolling portion 31a is set to be used for rolling the edge of the cutting edge 120a. The rolling pressure at the edge of the cutting edge 120a of the pole piece 120 is the greatest. From the edge of the cutting edge 120a of the pole piece 120 to the middle area of ​​the pole piece 120, the rolling pressure of the first rolling portion 31a and the second roller 32 of the first roller 31 on the pole piece 120 gradually decreases. With this arrangement, the edge of the cutting edge 120a, which is prone to wrinkles, can be rolled by the portion with the largest diameter of the first rolling portion 31a. After being rolled by the wrinkle removal device 3, the stress distribution at the cutting edge 120a of the pole piece 120 is more uniform, which is conducive to improving the wrinkle removal effect of the pole piece 120.

[0050] The first rolling portion 31a may change from small to large in a stepped transition, a smooth transition, or a planar transition, which is not limited here.

[0051] In some embodiments, the diameter of the first rolling portion 31 a changes from small to large through an arc-shaped transition structure or a step structure.

[0052] The first rolling portion 31a is adapted to change its diameter from small to large via an arcuate transition structure. This arcuate transition structure can be a conical surface, a convex arcuate surface, or a concave arcuate surface, without limitation. The provision of this arcuate transition structure allows for a smoother change in the diameter of the first rolling portion 31a, and a smoother transition in the rolling pressure exerted on the electrode piece 120 by the first rolling portion 31a and the second roller 32, thereby enhancing the wrinkle removal effect of the wrinkle removal device 3 on the electrode piece 120.

[0053] The first rolling portion 31a has a stepped transition, and multiple stepped surfaces can be provided between the two ends of the first rolling portion 31a. The step heights of the stepped surfaces can be set sufficiently small to prevent the edges of the stepped surfaces from damaging the electrode sheet 120. In this arrangement, the wrinkle removal device 3 can still achieve the wrinkle removal effect on the cut edge 120a of the electrode sheet 120.

[0054] It is understandable that one first rolling portion 31 a may correspond to one cutting edge 120 a of one electrode sheet 120 , or may correspond to two adjacent cutting edges 120 a of two adjacent electrode sheets 120 .

[0055] In other embodiments, as shown in FIG3 , in the axial direction of the first roller 31 , the diameter of the first rolling portion 31 a first changes from small to large, and then changes from large to small.

[0056] It is understood that the location where the first rolling portion 31a has the largest diameter can correspond to the edge of the cut edge 120a of two adjacent electrode sheets 120. From the edge of the cut edge 120a of the electrode sheet 120 to the middle of the electrode sheets 120 on both sides, the diameter of the first rolling portion 31a corresponding to the electrode sheet 120 gradually decreases. Thus, from the edge of the cut edge 120a to both sides, the rolling pressure of the wrinkle removal device 3 on the electrode sheet 120 gradually decreases. This arrangement allows one rolling portion to correspond to the edges of the cut edges 120a of two electrode sheets 120, simplifying the structure of the wrinkle removal device 3. At the same time, the rolling pressure of the wrinkle removal device 3 on the electrode sheet 120 gradually decreases from the edge of the cut edge 120a of the electrode sheet 120 to the middle, making the stress distribution of the cut edge 120a of the electrode sheet 120 more uniform after passing through the wrinkle removal device 3, further reducing the risk of wrinkles in the electrode sheet 120.

[0057] In some embodiments, as shown in FIG4 , the second roller 32 includes a second rolling portion 32a opposite the first rolling portion 31a. The diameter of the second rolling portion 32a increases from small to large in the axial direction of the second roller 32. The largest diameter portion of the second roller 32 is located opposite the largest diameter portion of the first roller 31.

[0058] It can be understood that the first rolling portion 31 a of the first roller 31 can be cylindrical, truncated cone or other irregular shapes.

[0059] Optionally, the first rolling portion 31a may be of the same shape as the second rolling portion 32a, and the two rolling portions are arranged opposite each other. With this arrangement, when the wrinkle-removing device 3 rolls the cut edge 120a of the electrode sheet 120, the forces on both sides of the electrode sheet 120 are more balanced. The stress release spaces along both sides of the electrode sheet 120 during the wrinkle-removing process are consistent, facilitating smooth wrinkle removal of the electrode sheet 120 and reducing the possibility of further wrinkling of the electrode sheet 120 during the rolling process.

[0060] The first roller 31 and the second roller 32 can roll the cut edge 120 a of the electrode sheet 120 at room temperature, or can be heated or cooled as needed, which is not limited here.

[0061] In some optional embodiments, as shown in FIG. 5 , a flow channel 31 b is provided inside the first roller 31 , and the flow channel 31 b is used to circulate a heat-conducting medium, and the heat-conducting medium is used to exchange heat with the first roller 31 .

[0062] Specifically, the heat-conducting medium in the flow channel 31b can heat or cool the first roller 31. For example, the heat-conducting medium in the flow channel 31b is used to heat the first roller 31. During the rolling process of the electrode 120, the first roller 31 heats the electrode 120. This can accelerate the stress reloading process of the cut edge 120a of the electrode 120, thereby facilitating the removal of wrinkles in the electrode 120. Furthermore, for the electrode 120 after lithium supplementation, heating the electrode 120 by the first roller 31 can accelerate the embedding of active material into the electrode 120.

[0063] The heat-conducting medium exchanges heat with the first roller 31 to maintain the first roller 31 within a preset temperature range, thereby maintaining the temperature of the electrode 120 within a preset range during the wrinkle removal process. It can be set according to the specific needs of the electrode 120 during the wrinkle removal process.

[0064] In some optional embodiments, the heat conducting medium exchanges heat with the first roller 31 to maintain the surface temperature of the first roller 31 near the pole piece 120 between 35°C and 40°C. Specifically, the temperature may be 35°C, 38°C, 39°C, or 40°C. This arrangement ensures the stress reloading process of the pole piece 120 and accelerates the embedding of the active material into the pole piece 120, while reducing the possibility of damage to the pole piece 120 due to excessive temperature.

[0065] There is no limitation on the distribution form of the flow channel 31b in the first roller 31, and it can be a labyrinth type, a hollow cylinder type or other irregular types, which are not limited here.

[0066] In some optional embodiments, the flow channel 31 b is spirally arranged around the center line of the first roller 31 .

[0067] It can be understood that the flow channel 31b is spirally arranged around the center line of the first roller 31. When the flow channel 31b occupies the same volume, the area corresponding to the outer surface of the first roller 31 of the spirally arranged flow channel 31b is larger, which is beneficial to improving the heat exchange rate between the heat-conducting medium and the first roller 31.

[0068] It can be understood that the smaller the distance between the flow channel 31b and the outer surface of the first roller 31, the faster the heat exchange rate between the heat-conducting medium in the flow channel 31b and the outer surface of the first roller 31. In some optional embodiments, the distance between the flow channel 31b and the outer surface of the first roller 31 is d, 0<d≤2mm. Specifically, d can be 0.5mm, 1mm, 1.5mm or 2mm, etc. Setting the distance between the flow channel 31b and the outer surface of the first roller 31 to satisfy the above relationship can increase the heat exchange rate between the heat-conducting medium and the outer surface of the first roller 31, thereby increasing the heat exchange rate between the first roller 31 and the pole piece 120.

[0069] It should be noted that, in some optional embodiments, a flow channel may be provided inside the second roller 32, and the flow channel may be spirally provided around the center line of the second roller 32, which has the same technical effect as providing the flow channel 31b inside the first roller 31, and will not be repeated here.

[0070] In some embodiments, as shown in FIG6 , the electrode forming equipment further includes a lithium replenishing device 5 , which is disposed between the material input device 1 and the slitting device 2 , and is used to laminate the lithium strip onto the surface of the mother electrode 110 .

[0071] Specifically, the lithium replenishment device 5 includes a lithium ribbon unwinding mechanism 51, a release agent coating mechanism 52, a pressure roller mechanism 53, and a traction film winding mechanism 54. The release agent coating mechanism 52 coats different types of release agents on both sides of the lithium ribbon so that after the lithium ribbon passes through the pressure roller mechanism 53, the lithium ribbon is rolled and thinned, and lithium chips adhere to the pressure roller mechanism 53. The lithium ribbon is pulled by the traction film winding mechanism 54, and the traction film winding mechanism 54 can wind up the traction film in the lithium ribbon. During the process of the pressure roller mechanism 53 rolling the mother electrode sheet 110, the lithium chips are transferred to the surface of the mother electrode sheet 110, completing the lithium replenishment process of the mother electrode sheet 110.

[0072] By providing the lithium replenishing device 5 , the lithium replenishing and slitting processes of the electrode 120 are integrated into the electrode forming equipment, which can improve the structural integration of the electrode forming equipment and simplify the operating procedures during the forming process of the electrode 120 .

[0073] In some embodiments, as shown in FIG7 , the electrode forming apparatus further includes a deflection correction device 6 for guiding the tape running direction of the electrode 120. Providing the deflection correction device 6 can reduce the possibility of the electrode 120 being deflected during the tape running process, thereby improving the yield rate of the electrode 120.

[0074] It is understandable that the correction device 6 can be set at a suitable position as needed, and there is no limitation here.

[0075] In some optional embodiments, the deflection correction device 6 is disposed between the slitting device 2 and the wrinkle removal device 3. Thus, after the electrode 120 is slit, the electrode 120 is deflected, so that during the subsequent wrinkle removal process, the wrinkle removal device 3 can more accurately roll onto the edge of the slitting edge 120a of the electrode 120, thereby achieving a better wrinkle removal effect.

[0076] In other embodiments, the deviation-correcting device 6 is disposed between the wrinkle-removing device 3 and the winding device 4. This facilitates the smooth winding of the pole piece 120 and reduces the possibility of secondary wrinkles on the pole piece 120 after the wrinkle-removing process is completed.

[0077] In some embodiments, as shown in FIG8 , the pole piece forming apparatus further includes a burr removal device 7 disposed between the slitting device 2 and the winding device 4 . The burr removal device 7 is used to remove burrs from the slitting edge 120 a of the pole piece 120 , thereby reducing the risk of damage to the pole piece 120 caused by the burrs.

[0078] The specific structure of the burr removal device 7 is not limited, as long as it can remove burrs from the cutting edge 120a. In an optional embodiment, the burr removal device 7 includes a brush mechanism 71 and a dust collection mechanism 72. The brush mechanism 71 is used to remove burrs from the cutting edge 120a. The dust collection mechanism 72 is used to collect burrs removed by the brush mechanism 71. Specifically, the dust collection mechanism 72 can be a negative pressure dust collection mechanism, etc.

[0079] It is understandable that the burrs removed by the brush mechanism 71 cannot be allowed to flow freely, and should be collected by the dust collection mechanism 72 to reduce the risk of the burrs flowing arbitrarily and affecting the cleanliness of the production environment of the pole piece 120. At the same time, it can also reduce the risk of the burrs falling on the surface of the pole piece 120 and puncturing the pole piece 120 during the subsequent processing of the pole piece 120.

[0080] It is understandable that after the electrode piece 120 is cut, the conductive material therein will be exposed to the external environment. For example, for the electrode piece 120 after lithium supplementation, the lithium film at the cut portion of the electrode piece 120 is exposed to the external environment.

[0081] In order to avoid the exposing of the cut edge 120a of the pole piece 120 and reduce the risk of subsequent short circuit of the pole piece 120, in some optional embodiments, please continue to refer to Figure 8, the pole piece forming equipment also includes a gluing mechanism 8 and a drying device 9. The gluing mechanism 8 is arranged between the burr processing device 7 and the winding device 4, and is used to apply glue to the cut edge 120a. The drying device 9 is arranged between the gluing mechanism 8 and the winding device 4, and is used to dry the pole piece 120 after gluing. Specifically, after the burr processing is performed on the cut edge 120a of the pole piece 120, the cut edge 120a of the pole piece 120 is glued, and the width of the glue can be between 1 mm and 2 mm. After the gluing is completed, the glue layer formed after the gluing is dried by the drying device 9, and finally the pole piece 120 is wound up.

[0082] It is understandable that applying glue to the cut edge 120 a of the pole piece 120 can not only reduce the risk of short circuit of the pole piece 120 , but also further remove burrs on the cut edge 120 a .

[0083] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A pole piece forming device, comprising: Incoming device, used to provide mother pole pieces; A slitting device, used for slitting the mother electrode sheet into multiple electrode sheets; A plurality of winding devices are used to pull the electrode sheet along the tape, each winding device winding up a corresponding electrode sheet, and the slitting device is arranged between the incoming device and the winding device; A wrinkle removal device is arranged between the slitting device and the winding device, and the wrinkle removal device includes a first roller and a second roller arranged opposite to each other, the first roller includes a first rolling portion, and the first rolling portion and the second roller are used to roll the edges of the slitting edges of the pole piece.

2. The pole piece forming equipment according to claim 1, wherein: In the axial direction of the first roller, the diameter of the first rolling part increases from small to large, and the part with the largest diameter of the first rolling part is used to roll the edge of the cutting edge; the part with the smaller diameter of the first roller is closer to the middle position of the pole piece.

3. The pole piece forming equipment according to claim 1 or 2, wherein: The first rolling portion changes its diameter from small to large through an arc-shaped transition structure or a step structure.

4. The pole piece forming equipment according to claim 1 or 2, wherein: In the axial direction of the first roller, the diameter of the first rolling portion first changes from small to large and then changes from large to small.

5. The pole piece forming equipment according to any one of claims 1 to 4, wherein: The second roller includes a second rolling portion opposite to the first rolling portion. In the axial direction of the second roller, the diameter of the second rolling portion increases from small to large. The largest diameter portion of the second roller is opposite to the largest diameter portion of the first roller.

6. The pole piece forming equipment according to any one of claims 1 to 5, wherein: A flow channel is provided inside the first roller, and the flow channel is used for circulating a heat-conducting medium, and the heat-conducting medium is used for heat exchange with the first roller.

7. The pole piece forming equipment according to claim 6, wherein: The heat conducting medium exchanges heat with the first roller so that the surface temperature of the first roller close to the pole piece is maintained between 35° C. and 40° C.

8. The pole piece forming equipment according to claim 6 or 7, wherein: The flow channel is spirally arranged around the center line of the first roller.

9. The pole piece forming equipment according to claim 8, wherein: The distance between the flow channel and the outer surface of the first roller is d, 0<d≤2mm.

10. The pole piece forming equipment according to any one of claims 1 to 9, wherein: Also includes: The lithium replenishing device is arranged between the material incoming device and the slitting device, and is used to cover the lithium strip on the surface of the mother electrode.

11. The pole piece forming equipment according to any one of claims 1 to 10, wherein: It also includes a deviation correction device, which is used to guide the running direction of the pole piece; The deflection-correcting device is arranged between the slitting device and the wrinkle-removing device; and / or the deflection-correcting device is arranged between the wrinkle-removing device and the winding device.

12. The pole piece forming equipment according to any one of claims 1 to 11, wherein: The pole piece forming device further includes a burr processing device disposed between the slitting device and the winding device, the burr processing device including: A brush mechanism, used for removing burrs from the cut edges; The dust collecting mechanism is used to collect the burrs removed by the brush mechanism.

13. The pole piece forming equipment according to claim 12, wherein: The pole piece forming equipment also includes: a gluing mechanism, disposed between the burr treatment device and the winding device, for gluing the cut edges; The drying device is arranged between the gluing mechanism and the winding device, and is used for drying the electrode after gluing.