Pole piece forming apparatus

Abstract

The application provides an electrode piece forming device, which comprises a feeding device, a slitting device, a plurality of winding devices and a wrinkle removing device. The feeding device provides a mother electrode piece. The slitting device splits the mother electrode piece into a plurality of electrode pieces. The winding devices pull the electrode pieces to run, and each winding device winds a corresponding electrode piece. The slitting device is arranged between the feeding device and the winding devices. The wrinkle removing device is arranged between the slitting device and the winding devices, and comprises a first roller and a second roller arranged oppositely. The first roller comprises a first roller pressing part, and the first roller pressing part and the second roller are used for rolling the edges of the slitting edges of the electrode pieces. The electrode piece forming device provided by the application can effectively reduce the risk of wrinkles of the electrode pieces formed after the mother electrode piece is split, improve the yield of the electrode pieces, and improve the safety of the batteries formed by the electrode pieces in the working process.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pole piece processing, in particular to a pole piece forming device. BACKGROUND

[0002] Batteries are widely used in electrical devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc. Batteries can include cadmium-nickel batteries, hydrogen-nickel batteries, lithium-ion batteries and secondary alkaline zinc-manganese batteries, etc.

[0003] In the development of battery technology, as an important component of batteries, the pole piece ensures the smooth progress of various processes in the production process, reduces the waste rate in the production process of the pole piece, and improves the product quality of the pole piece, which is a continuous improvement problem in battery technology. SUMMARY

[0004] The application provides a pole piece forming device, which can improve the product quality of the pole piece and reduce the waste rate in the production process of the pole piece.

[0005] The application provides a pole piece forming device, which comprises a feeding 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 pieces, each winding device winding a corresponding pole piece, the slitting device being arranged between the feeding device and the winding devices, and a wrinkle removing device arranged between the slitting device and the winding devices, wherein the wrinkle removing device comprises a first roller and a second roller arranged oppositely, and the first roller comprises a first roller pressing part, and the first roller pressing part and the second roller are used for roller pressing the edge of the slitting edge of the pole piece.

[0006] The pole piece forming device provided by the application arranges the wrinkle removing device between the slitting device and the winding device, and arranges the wrinkle removing device to comprise a first roller and a second roller arranged oppositely, and roller presses the slitting edge of the pole piece through the first roller pressing part of the first roller and the second roller, thereby effectively reducing the risk of wrinkles of the pole piece formed after the mother pole piece is slit, improving the yield of the pole piece, and improving the safety of the battery formed by the pole piece production in the working process.

[0007] In some embodiments, in the axial direction of the first roller, the diameter of the first roller pressing part changes from small to large, and the part with the largest diameter of the first roller pressing part is used for roller pressing the edge of the slitting edge; and the part with smaller diameter of the first roller is closer to the middle position of the pole piece. In this way, the part with the largest diameter of the first roller pressing part can be used for roller pressing the edge of the slitting edge which is prone to wrinkles. The stress distribution of the slitting edge of the pole piece after roller pressing by the wrinkle removing device is more uniform, which is conducive to improving the wrinkle removing effect of the pole piece.

[0008] In some embodiments, the first roller portion has a diameter that increases from small to large through an arc-shaped transition structure or a stepped transition structure. Both the arc-shaped transition structure and the stepped transition structure can achieve the purpose of increasing the diameter of the first roller portion from small to large.

[0009] In some embodiments, in the axial direction of the first roller, the diameter of the first roller portion first increases from small to large and then decreases from large to small. In this way, one roller portion can correspond to the edges of the slitting edges of two pole pieces, simplifying the structure of the wrinkle removal device. At the same time, the roller pressure of the pole piece exerted by the wrinkle removal device gradually decreases from the edges of the slitting edges to the middle of the pole piece, so that the stress distribution of the slitting edges of the pole piece after passing through the wrinkle removal device is more uniform, further reducing the risk of wrinkles on the pole piece.

[0010] In some embodiments, the second roller includes a second roller portion opposite to the first roller portion, and in the axial direction of the second roller, the diameter of the second roller portion increases from small to large; the largest diameter part of the second roller is opposite to the largest diameter part of the first roller. The first roller portion and the second roller portion can be arranged in the same shape and opposite to each other. In this way, when the wrinkle removal device rolls the slitting edges of the pole piece, the stress on the two side surfaces of the pole piece is more balanced, the space for stress release of the pole piece along the two sides during the wrinkle removal process is consistent, which is conducive to the smooth progress of the pole piece wrinkle removal work, and reduces the possibility of the pole piece being wrinkled again during the rolling process.

[0011] In some embodiments, the first roller is internally provided with a flow channel for flowing a heat-conducting medium, and the heat-conducting medium is used for heat exchange with the first roller. In this way, the wrinkles of the slitting edges of the pole piece can be better removed, and in addition, for the pole piece after lithium supplement, the heating of the pole piece by the first roller can accelerate the embedding of the active material into the pole piece.

[0012] In some embodiments, the heat-conducting medium exchanges heat with the first roller to maintain the surface temperature of the first roller close to the pole piece at 35-40℃. In this way, the progress of stress reloading of the pole piece can be ensured, the embedding of the active material into the pole piece can be accelerated, and the possibility of damaging the structure of the pole piece due to excessive temperature can be reduced.

[0013] In some embodiments, the flow channel is spirally arranged around the center line of the first roller. The flow channel arranged in a spiral 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.

[0014] In some embodiments, the distance between the flow channel and the outer surface of the first roller is d, and 0

[0015] In some embodiments, the pole piece forming device further comprises a lithium supplement device arranged between the incoming material device and the slitting device, and the lithium supplement device is configured to cover a lithium strip on the surface of the mother pole piece. Integrating the lithium supplement and slitting processes of the pole piece in the pole piece forming device can improve the structural integration of the pole piece forming device and simplify the operation process of the pole piece forming process.

[0016] In some embodiments, the pole piece forming device further comprises a deviation rectifying device configured to guide the running direction of the pole piece, and the deviation rectifying device is arranged between the slitting device and the wrinkle removing device, and / or the deviation rectifying device is arranged between the wrinkle removing device and the winding device. In this way, the wrinkle removing effect is better, and the possibility of secondary wrinkles after the pole piece wrinkle removing process is reduced.

[0017] In some embodiments, the pole piece forming device further comprises a burr processing device arranged between the slitting device and the winding device, and the burr processing device comprises a brush mechanism configured to remove burrs on the slitting edge, and a dust collection mechanism configured to collect the burrs removed by the brush mechanism. This can reduce the risk of burrs affecting the cleanliness of the pole piece production environment, and can also reduce the risk of burrs falling on the surface of the pole piece and piercing the pole piece in the subsequent pole piece processing process.

[0018] In some embodiments, the pole piece forming device further comprises a gluing mechanism arranged between the burr processing device and the winding device, and configured to glue the slitting edge, and a drying device arranged between the gluing mechanism and the winding device, and configured to dry the pole piece after gluing. In this way, the slitting edge of the pole piece can be avoided from being exposed, and the risk of short circuit of the pole piece in the subsequent use process can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0020] Figure 1 is a structural schematic diagram of a pole piece forming device provided by the present embodiment;

[0021] Figure 2 is a structural schematic diagram of the first roller and the second roller rolling the pole piece in the pole piece forming device provided by the present embodiment;

[0022] Figure 3 is a structural schematic diagram of the first roller and the second roller rolling the pole piece in another pole piece forming device provided by the present embodiment;

[0023] Figure 4is a structure schematic view of the first roller and the second roller rolling the pole piece in the pole piece forming device provided by the embodiment of the present application;

[0024] Figure 5 is a sectional view of the first roller in the pole piece forming device provided by the embodiment of the present application;

[0025] Figure 6 is a structure principle view of another pole piece forming device provided by the embodiment of the present application;

[0026] Figure 7 is a structure principle view of another pole piece forming device provided by the embodiment of the present application;

[0027] Figure 8 is a structure principle view of another pole piece forming device provided by the embodiment of the present application.

[0028] In the drawings, the drawings are not necessarily drawn according to the actual scale.

[0029] Label explanation:

[0030] 1, incoming device; 2, slitting device; 3, wrinkle removing device; 31, first roller; 31a, first roller pressing part; 31b, flow channel; 32, second roller; 32a, second roller pressing part; 4, winding device; 5, lithium supplementing device; 51, lithium ribbon unwinding mechanism; 52, release agent coating mechanism; 53, compression roller mechanism; 54, traction film winding mechanism; 6, deviation rectifying device; 7, burr processing device; 71, brush mechanism; 72, dust collecting mechanism; 8, gluing mechanism; 9, drying device;

[0031] 110, female pole piece; 120, pole piece; 120a, slitting edge. DETAILED DESCRIPTION

[0032] The embodiments of the present application are further described in detail below with reference to the drawings and examples. The detailed description and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0033] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0034] Reference to "an embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] The orientation words appearing in the following description are the directions shown in the drawings, and are not a limitation on the specific structure of the present application. In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] 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, etc., have the advantages of high energy density, high power density, many times of cyclic use, long storage time, etc., and have been widely used in electric devices suitable for batteries. For example, the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric plane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc.

[0037] In the production process of the battery, the pole piece of the battery needs to go through coating, rolling, drying, slitting and other processes, and for some pole pieces, lithium supplement is also needed.

[0038] The inventors found that in the production process of the pole piece, there is a phenomenon of wrinkles on the edge of the pole piece formed by production. After that, the inventors made a systematic analysis and research on the forming process and forming equipment of the pole piece, and found that after the mother pole piece goes through the lithium supplement, coating or rolling process, there is a certain stress inside. In the process of slitting the mother pole piece to form the pole piece, the stress of the mother pole piece at the slitting position will be released instantaneously, so that the slitting edge of the pole piece formed has no tension, and the stress of the side not passing through the slitting knife is not released. The stress release of the two sides of the pole piece formed is inconsistent, the stress distribution of the two sides is different, which easily causes the slitting edge of the pole piece to form a wavy edge, a collapsed edge or a serious sinking, etc. Wrinkle problem, especially for the pole piece after the lithium supplement process, the mother pole piece after lithium supplement becomes brittle and hard, and the stress difference of the two sides of the pole piece formed after slitting is larger, and the risk of the pole piece to appear wrinkles is higher.

[0039] Based on the above problems found by the inventors, the inventors improved the structure of the pole piece forming equipment, and the technical scheme described in the embodiments of the present application is suitable for the pole piece forming equipment.

[0040] Figure 1 The structure schematic diagram of the pole piece forming equipment provided by the embodiments of the present application is shown, Figure 2 The structure schematic diagram of the first roller 31 and the second roller 32 and the rolled pole piece 120 is shown.

[0041] According to the pole piece forming equipment provided by the embodiments of the present application, as shown in Figure 1 and Figure 2 The pole piece forming equipment includes a feeding device 1, a slitting device 2, a plurality of winding devices 4 and a wrinkle removing device 3. The feeding device 1 is used to provide a mother pole piece 110. The slitting device 2 is used to slit the mother pole piece 110 into a plurality of pole pieces 120. The winding device 4 is used to pull the pole piece 120. Each winding device 4 winds a corresponding pole piece 120. The slitting device 2 is arranged between the feeding device 1 and the winding device 4. The wrinkle removing device 3 is arranged between the slitting device 2 and the winding device 4. The wrinkle removing device 3 includes a first roller 31 and a second roller 32 arranged oppositely. The first roller 31 includes a first roller 31a, and the first roller 31a and the second roller 32 are used to roll the edge of the slitting edge 120a of the pole piece 120.

[0042] Specifically, the slitting device 2 slits the mother sheet 110 into a plurality of sheets 120 along the slitting edge 120a of the sheet 120. After the slitting is completed, the edge of the slitting edge 120a of the sheet 120 is prone to wrinkle. The first roller 31 and the second roller 32 together clamp and roll the edge of the slitting edge 120a of the sheet 120. During the rolling process, the stress at the edge of the slitting edge 120a of the sheet 120 is redistributed, and the wrinkle of the slitting edge 120a is flattened.

[0043] It can be understood that the structure and shape of the first roller 31 and the second roller 32 are not limited, and the shapes of the first roller 31 and the second roller 32 can be the same or different, as long as they can clamp and roll the edge of the slitting edge 120a of the sheet 120. Exemplarily, the first roller 31 and the second roller 32 can be cylindrical, frustoconical or other irregular shapes. The first roller 31 and the second roller 32 can only roll the edge of the slitting edge 120a of the sheet 120, or can roll the entire sheet 120. Different rolling forms correspond to different structures of the first roller 31 and the second roller 32.

[0044] It should be noted that the mother sheet 110 can be slit into two or more sheets 120. One first roller 31 corresponds to the edges of the slitting edges 120a of two adjacent sheets 120. When the number of sheets 120 formed after slitting is more than three, the first roller 31 can be provided with a plurality of first roller pressing portions 31a, so that each edge of the slitting edge 120a has a corresponding first roller pressing portion 31a for rolling. Of course, one first roller 31 can be provided with one first roller pressing portion 31a, and a plurality of first rollers 31 can be provided, each first roller 31 corresponding to the edges of the slitting edges 120a of two adjacent sheets 120.

[0045] The sheet forming device provided by the embodiment of the present application sets the wrinkle removing device 3 between the slitting device 2 and the winding device 4, and sets the wrinkle removing device 3 to include the first roller 31 and the second roller 32 arranged oppositely. The first roller pressing portion 31a of the first roller 31 and the second roller 32 roll the slitting edge 120a of the sheet 120, which effectively reduces the risk of wrinkles of the sheet 120 formed after the mother sheet 110 is slit, improves the yield of the sheet 120, and improves the safety of the battery formed by the sheet 120 during operation.

[0046] In some embodiments, in the axial direction of the first roller 31, the diameter of the first roller pressing portion 31a increases from small to large, and the part with the largest diameter of the first roller pressing portion 31a is used to roll the edge of the slitting edge 120a. The smaller part of the first roller 31 is closer to the middle position of the sheet 120.

[0047] It can be understood that the stress release at the edge of the slitting edge 120a of the pole piece 120 is the most complete, and therefore the amplitude of the wrinkles generated is the most obvious, and the closer to the edge position of the pole piece 120, the more serious the wrinkles of the pole piece 120. Therefore, the diameter of the first roller pressing part 31a is set from small to large, and the position where the diameter of the first roller pressing part 31a is the largest is used to roll the edge of the slitting edge 120a, and the rolling force of the first roller pressing part 31a and the second roller 32 on the pole piece 120 is the largest at the edge of the slitting edge 120a of the pole piece 120, and gradually decreases from the edge of the slitting edge 120a of the pole piece 120 to the middle region of the pole piece 120. By setting in this way, the edge of the slitting edge 120a prone to wrinkles can be rolled by the position where the diameter of the first roller pressing part 31a is the largest, and the stress distribution at the slitting edge 120a of the pole piece 120 after rolling by the wrinkle removing device 3 is more uniform, which is conducive to improving the wrinkle removing effect of the pole piece 120.

[0048] The first roller pressing part 31a can be stepped transition, smooth transition, or planar transition, which is not limited here.

[0049] In some embodiments, the first roller pressing part 31a has a diameter that increases from small to large through an arc transition structure or a stepped structure.

[0050] The first roller pressing part 31a has a diameter that increases from small to large through an arc transition structure, which can be a conical surface, an outward convex arc surface, or an inward concave arc surface, which is not limited here. By setting the arc transition structure, the diameter of the first roller pressing part 31a can change more smoothly, and the rolling force of the first roller pressing part 31a and the second roller 32 on the pole piece 120 can also transition more smoothly, which is conducive to improving the wrinkle removing effect of the pole piece 120 by the wrinkle removing device 3.

[0051] The first roller pressing part 31a can be stepped transition, smooth transition, or planar transition, which is not limited here.

[0052] It can be understood that one first roller pressing part 31a can correspond to one slitting edge 120a of one pole piece 120, or can correspond to two adjacent slitting edges 120a of two adjacent pole pieces 120.

[0053] In other embodiments, as shown in Figure 3 In the axial direction of the first roller 31, the diameter of the first roller pressing part 31a first increases from small to large, and then decreases from large to small.

[0054] It can be understood that the position of the first roller 31a with the largest diameter can correspond to the edge of the slitting edge 120a of the adjacent two pole pieces 120. From the edge of the slitting edge 120a of the pole piece 120 to the middle direction of the pole piece 120 on both sides, the diameter of the first roller 31a corresponding to the pole piece 120 gradually decreases, and then the roller pressure of the wrinkle removing device 3 on the pole piece 120 gradually decreases from the edge of the slitting edge 120a to both sides. In this way, one roller can correspond to the edges of the slitting edges 120a of two pole pieces 120, and the structure of the wrinkle removing device 3 is simplified. At the same time, the roller pressure of the wrinkle removing device 3 on the pole piece 120 gradually decreases from the edge of the slitting edge 120a of the pole piece 120 to the middle, so that the stress distribution of the slitting edge 120a of the pole piece 120 after passing through the wrinkle removing device 3 is more uniform, and the risk of wrinkles on the pole piece 120 is further reduced.

[0055] In some embodiments, as shown in Figure 4 The second roller 32 includes a second roller 32a opposite to the first roller 31a. In the axial direction of the second roller 32, the diameter of the second roller 32a gradually increases from small to large. The largest diameter of the second roller 32 is opposite to the largest diameter of the first roller 31.

[0056] It can be understood that the first roller 31a of the first roller 31 can be cylindrical, conical or other irregular shapes.

[0057] Alternatively, the first roller 31a can also be the same shape as the second roller 32a, and the two are oppositely arranged. In this way, when the wrinkle removing device 3 rolls the slitting edge 120a of the pole piece 120, the stress on the two side surfaces of the pole piece 120 is more balanced, the space for stress release of the pole piece 120 along the two sides during the wrinkle removing process is consistent, which is conducive to the smooth progress of the wrinkle removing work of the pole piece 120, and reduces the possibility of wrinkles on the pole piece 120 during the rolling process.

[0058] The first roller 31 and the second roller 32 can be rolled at room temperature during the process of rolling the slitting edge 120a of the pole piece 120, or the first roller 31 and the second roller 32 can be heated or cooled according to actual needs, which is not limited here.

[0059] In some optional embodiments, as shown in Figure 5 The first roller 31 is internally provided with a flow channel 31b for flowing through a heat-conducting medium, and the heat-conducting medium is used for heat exchange with the first roller 31.

[0060] 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, which can heat the pole piece 120 during the rolling process, thereby accelerating the stress reloading process of the cutting edge 120a of the pole piece 120 and facilitating the removal of wrinkles of the pole piece 120. In addition, for the pole piece 120 after lithium supplement, the heating of the pole piece 120 by the first roller 31 can accelerate the embedding of the active material into the pole piece 120.

[0061] The heat-conducting medium exchanges heat with the first roller 31 to maintain the first roller 31 at a preset temperature range, so that the temperature of the pole piece 120 during the wrinkle removal process is maintained within a preset range, which can be set according to the specific needs of the pole piece 120 during the wrinkle removal process.

[0062] 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 close to the pole piece 120 at 35-40°C. Specifically, the temperature can be 35°C, 38°C, 39°C or 40°C, etc. In this way, the process of stress reloading of the pole piece 120 and the embedding of the active material into the pole piece 120 can be accelerated, while the possibility of damage to the structure of the pole piece 120 due to excessive temperature can be reduced.

[0063] The distribution form of the flow channel 31b in the first roller 31 is not limited, which can be a labyrinth type, a hollow cylinder type or other irregular type, which is not limited here.

[0064] In some optional embodiments, the flow channel 31b is spirally arranged around the center line of the first roller 31.

[0065] It can be understood that the flow channel 31b is spirally arranged around the center line of the first roller 31, and in the case of the same volume occupied by the flow channel 31b, the flow channel 31b spirally arranged has a larger area corresponding to the outer surface of the first roller 31, which is beneficial to improve the heat exchange rate of the heat-conducting medium and the first roller 31.

[0066] 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 of 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, and 0 < d ≤ 2 mm. Specifically, d can be 0.5 mm, 1 mm, 1.5 mm or 2 mm, etc. The distance between the flow channel 31b and the outer surface of the first roller 31 satisfies the above relationship, which can improve the heat exchange rate of the heat-conducting medium and the outer surface of the first roller 31, and further improve the heat exchange rate of the first roller 31 and the pole piece 120.

[0067] It should be noted that in some alternative embodiments, a flow channel can also be arranged inside the second roller 32, and the flow channel is arranged spirally around the center line of the second roller 32, which has the same technical effect as arranging the flow channel 31b inside the first roller 31, and will not be described here.

[0068] In some embodiments, as shown in Figure 6 The pole piece forming device further includes a lithium supplement device 5 arranged between the incoming device 1 and the slitting device 2, and the lithium supplement device 5 is used to cover the lithium strip on the surface of the mother pole piece 110.

[0069] Specifically, the lithium supplement device 5 includes a lithium strip 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 strip, so that after the lithium strip passes through the pressure roller mechanism 53, the lithium strip is thinned by rolling and the lithium chips are adhered to the pressure roller mechanism 53. The lithium strip is pulled by the traction film winding mechanism 54, which can wind the traction film in the lithium strip. During the rolling of the mother pole piece 110 by the pressure roller mechanism 53, the lithium chips are transferred to the surface of the mother pole piece 110, completing the lithium supplement process of the mother pole piece 110.

[0070] By arranging the lithium supplement device 5, the lithium supplement and slitting processes of the pole piece 120 are integrated in the pole piece forming device, which can improve the structural integration of the pole piece forming device and simplify the operation process during the forming of the pole piece 120.

[0071] In some embodiments, as shown in Figure 7 The pole piece forming device further includes a deviation rectifying device 6 for guiding the running direction of the pole piece 120. By arranging the deviation rectifying device 6, the possibility of deviation of the pole piece 120 during running can be reduced, thereby improving the yield of the pole piece 120.

[0072] It can be understood that the deviation rectifying device 6 can be arranged at a suitable position as needed, which is not limited here.

[0073] In some alternative embodiments, the deviation rectifying device 6 is arranged between the slitting device 2 and the wrinkle removing device 3. In this way, after the pole piece 120 is slitted, the pole piece 120 is rectified, which facilitates the subsequent rolling of the pole piece 120 in the wrinkle removing process, and the wrinkle removing device 3 can more accurately roll to the edge of the slitting edge 120a of the pole piece 120, having a better wrinkle removing effect.

[0074] In other embodiments, the deviation rectifying device 6 is arranged between the wrinkle removing device 3 and the winding device 4. In this way, the pole piece 120 can be smoothly wound, and the possibility of secondary wrinkles after the pole piece 120 is subjected to the wrinkle removing process is reduced.

[0075] In some embodiments, as shown inFigure 8 As shown, the pole piece forming device further comprises a burr processing device 7 arranged between the slitting device 2 and the winding device 4, and the burr processing device 7 is used to remove the burrs of the slitting edge 120a of the pole piece 120. The burrs reduce the risk of damage to the pole piece 120.

[0076] The specific structure of the burr processing device 7 is not limited as long as it can remove the burrs of the slitting edge 120a. In an optional embodiment, the burr processing device 7 comprises a brush mechanism 71 and a dust collection mechanism 72. The brush mechanism 71 is used to remove the burrs of the slitting edge 120a. The dust collection mechanism 72 is used to collect the burrs removed by the brush mechanism 71. Specifically, the dust collection mechanism 72 can be a negative pressure dust collection mechanism or the like.

[0077] It can be understood that the burrs removed by the brush mechanism 71 cannot be allowed to flow freely, and the dust collection mechanism 72 should be used to collect them, reducing the risk of affecting the cleanliness of the production environment of the pole piece 120 due to the arbitrary flow of the burrs, and at the same time, reducing the risk of the burrs falling on the surface of the pole piece 120 and piercing the pole piece 120 in the subsequent processing process of the pole piece 120.

[0078] It can be understood that after the pole piece 120 is slit, the conductive material in it is exposed to the external environment, such as for the pole piece 120 after lithium supplementation, the lithium film at the slit of the pole piece 120 is exposed to the external environment.

[0079] In order to avoid the exposure of the slitting edge 120a of the pole piece 120, and reduce the risk of short circuit of the subsequent pole piece 120, in some optional embodiments, please continue to refer to Figure 8 , the pole piece forming device further comprises 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 glue the slitting 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 of the slitting edge 120a of the pole piece 120, the slitting edge 120a of the pole piece 120 is glued, and the width of the gluing can be between 1mm to 2mm. After gluing, the glue layer formed after gluing is dried by the drying device 9, and finally the pole piece 120 is wound.

[0080] It can be understood that gluing the slitting edge 120a of the pole piece 120 not only reduces the risk of short circuit of the pole piece 120, but also further removes the burrs of the slitting edge 120a.

[0081] Although the present application has been described with reference to preferred embodiments, it is to be understood that various modifications can change the scope of the present application to the full extent that equivalents, under the doctrine of equivalents to the full extent indicated by the doctrine of equivalents, are permissible. Furthermore, it is to be understood that the scope of the present application is not limited to the particular embodiments disclosed herein but covers modifications obvious to those skilled in the art within the scope of the present application.

Claims

1. An electrode forming device, characterized in that, include: The feeding device is used to supply the mother electrode sheets; A slitting device is used to slit the mother electrode sheet into multiple electrode sheets; Multiple winding devices are used to pull the electrode sheet on the conveyor belt, and each winding device winds up a corresponding electrode sheet. The slitting device is disposed between the feeding device and the winding device. A wrinkle-removing device is disposed between the slitting device and the winding device. The wrinkle-removing device includes a first roller and a second roller disposed opposite to each other. The first roller includes a first pressing section. The first pressing section and the second roller are used to press the edge of the slit edge of the electrode sheet. Along the axial direction of the first roller, the diameter of the first rolling section gradually increases, with the largest diameter portion of the first rolling section used to roll the edge of the slit edge; the smaller diameter portion of the first roller is closer to the center of the electrode sheet.

2. The electrode forming equipment according to claim 1, characterized in that, The diameter of the first roller pressing section gradually increases through an arc-shaped transition structure or a stepped structure.

3. The electrode forming equipment according to claim 1, characterized in that, Along the axial direction of the first roller, the diameter of the first roller pressing section first increases from small to large, and then decreases from large to small.

4. The electrode forming equipment according to claim 1, characterized in that, The second roller includes a second pressing section opposite to the first pressing section. In the axial direction of the second roller, the diameter of the second pressing section gradually increases. The part of the second roller with the largest diameter is opposite to the part of the first roller with the largest diameter.

5. The electrode forming equipment according to claim 1, characterized in that, The first roller has a flow channel inside, which is used to circulate a heat-conducting medium for heat exchange with the first roller.

6. The electrode forming equipment according to claim 5, characterized in that, The heat-conducting 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.

7. The electrode forming equipment according to claim 5, characterized in that, The flow channel is spirally arranged around the centerline of the first roller.

8. The electrode forming equipment according to claim 7, characterized in that, The distance between the flow channel and the outer surface of the first roller is d, where 0 < d ≤ 2 mm.

9. The electrode forming apparatus according to any one of claims 1 to 8, characterized in that, Also includes: A lithium replenishment device is disposed between the feeding device and the slitting device, and the lithium replenishment device is used to coat the lithium strip onto the surface of the mother electrode sheet.

10. The electrode forming apparatus according to any one of claims 1 to 8, characterized in that, It also includes a correction device for guiding the direction of the electrode's tape travel; The correction device is disposed between the slitting device and the wrinkle removal device; and / or, the correction device is disposed between the wrinkle removal device and the winding device.

11. The electrode forming apparatus according to any one of claims 1 to 8, characterized in that, The electrode forming equipment further includes a deburring device disposed between the slitting device and the winding device, the deburring device comprising: A brush mechanism is used to remove burrs from the cut edges; A dust collection mechanism is used to collect the burrs removed by the brush mechanism.

12. The electrode forming equipment according to claim 11, characterized in that, The electrode forming equipment also includes: A glue-applying mechanism is disposed between the burr treatment device and the winding device for applying glue to the slit edge; A drying device is disposed between the coating mechanism and the winding device for drying the coated electrode sheet.

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