Pole piece active material stripping equipment

Abstract

The utility model relates to the technical field of battery recovery, in particular to pole piece active material stripping equipment. The pole piece active material stripping equipment comprises a conveying device and a rolling device, the conveying device comprises a feeding end, a discharging end and a conveying bearing face located between the feeding end and the discharging end, and the conveying bearing face is used for bearing and transporting pole pieces; the rolling device is movably arranged above the conveying bearing face and comprises an arc-shaped extrusion face, and the arc-shaped extrusion face is matched with the conveying bearing face in an extrusion mode. By applying the technical scheme provided by the invention, the problem that equipment for stripping the active material of the pole piece is lacked in the prior art can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of battery recycling, and in particular to a device for stripping active materials from a pole piece. Background Art

[0002] Pole active material recycling refers to the process of recycling pole active materials from waste batteries. Pole active materials are important components of batteries. These materials usually contain precious elements. Recycling these materials can not only save resources, but also reduce environmental pollution.

[0003] Since the active materials of the electrode are adhered to the current collector by coating, it is necessary to first peel off the active materials from the current collector, and then collect, classify and extract the peeled active materials, so as to finally collect various elements.

[0004] However, currently, the active materials of the electrode are mostly collected by manual scraping, and the related technology lacks efficient and convenient equipment for stripping the active materials of the electrode. Utility Model Content

[0005] The present application provides a device for stripping active materials of a pole piece, so as to solve the problem that there is a lack of devices for stripping active materials of a pole piece in the related art.

[0006] The pole piece active material stripping device of the present application comprises:

[0007] A conveying device, comprising a feed end, a discharge end, and a conveying bearing surface located between the feed end and the discharge end, the conveying bearing surface being used to bear and transport the electrode piece;

[0008] The rolling device is movably arranged above the conveying bearing surface, and the rolling device comprises an arc-shaped extrusion surface, which is extrusion-matched with the conveying bearing surface.

[0009] In some embodiments, the rolling device includes a rolling roller, which is rotatably disposed above the conveying bearing surface, and the circumferential outer wall of the rolling roller forms an arc-shaped extrusion surface.

[0010] In some embodiments, the laminating roller comprises a plurality of laminating rollers, and the plurality of laminating rollers are arranged at intervals in the conveying direction of the conveying device.

[0011] In some embodiments, the rolling device further comprises a rolling convex portion, which is arranged on the circumferential outer wall of the rolling roller.

[0012] The rolling convex portion comprises an arcuate convex surface which is pressed and matched with the pole piece, and the circumferential outer wall of the rolling roller and the arcuate convex surface of the rolling convex portion form an arcuate extrusion surface.

[0013] In some embodiments, each laminating roller is provided with a plurality of laminating protrusions, and the plurality of laminating protrusions are arranged at intervals in the circumferential direction of the laminating roller.

[0014] In some embodiments, the rotation speeds of the plurality of laminating rollers are the same, and the initial installation angles of two adjacent laminating rollers are different, so that the laminating areas of the two adjacent laminating rollers on the same pole piece are misaligned or partially overlapped.

[0015] In some embodiments, each rolling roller is provided with a reference identification structure, which is used to mark the rotation angle of the rolling roller, and the angle β between the reference identification structures on two adjacent rolling rollers satisfies: 10°≤β≤20°.

[0016] In some embodiments, each rolling protrusion includes a plurality of rolling protrusions, the plurality of rolling protrusions are arranged at intervals in the axial direction of the rolling roller, and the rolling protrusions on two adjacent rolling rollers are staggered in the width direction of the conveying device.

[0017] In some embodiments, the radius R of the arc-shaped convex surface of each rolling convex portion satisfies: 5 mm ≤ R ≤ 10 mm;

[0018] and / or, the central angle α corresponding to the arc-shaped convex surface of each rolled convex portion satisfies: 20°≤α≤270°;

[0019] And / or, the distance L between the centers of circles corresponding to two adjacent arc-shaped convex surfaces satisfies: 20 mm ≤ L ≤ 80 mm;

[0020] And / or, the diameter D of the circumferential outer wall of the rolling roller satisfies: 50mm≤D≤150mm.

[0021] In some embodiments, the electrode active material stripping equipment also includes: a recovery device, the recovery device has a separation chamber, a sieve plate is arranged in the separation chamber, the sieve plate divides the separation chamber into a separation chamber located above the sieve plate and a recovery chamber located below the sieve plate, and the discharge end of the conveying device is connected to the separation chamber.

[0022] The electrode sheet active material stripping device provided in the present application includes a conveying device and a rolling device, wherein the conveying device includes a conveying bearing surface, and the conveying bearing surface is used to carry and transport the electrode sheet. Specifically, the electrode sheet includes a current collector and an active material coated on the current collector, and the electrode sheet can move from the feed end to the discharge end. A rolling device is arranged on the top of the conveying device, and the rolling device includes an arc-shaped extrusion surface, and the arc-shaped extrusion surface is extruded and matched with the conveying bearing surface. In this process, the arc-shaped extrusion surface can apply an extrusion force to the conveying bearing surface. When the electrode sheet passes under the arc-shaped extrusion surface, the arc-shaped extrusion surface can apply an extrusion force to the electrode sheet, thereby aggravating the degree of fragmentation of the active material. At the same time, since the rolling device can be movably arranged, the rolling device will drive the arc-shaped extrusion surface to move during the movement, so that the arc-shaped extrusion surface applies a tangential force tangential to the arc-shaped extrusion surface to the active material, thereby making it easier to strip the active material from the current collector. In addition, under the extrusion and movement of the rolling device, the friction between the active materials on the arc-shaped extrusion surface will also increase, so that the rolling device can achieve a scraping effect on the active materials, thereby increasing the probability of stripping the active materials from the current collector. Therefore, this embodiment realizes the automatic feeding of the pole piece through the conveying device, and realizes the stripping of the active material through the extrusion cooperation and relative movement between the rolling device and the conveying bearing surface, thereby achieving the effect of efficiently and conveniently stripping the active material on the pole piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 A top view of a pole piece active material stripping device provided in one embodiment of the present application;

[0025] Figure 2 for Figure 1 A side view of a pole piece active material stripping device;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of the rolling roller of the pole piece active material stripping equipment;

[0027] Figure 4 A top view of a pole piece active material stripping device provided in one embodiment of the present application;

[0028] Figure 5 for Figure 4 A side view of a pole piece active material stripping device;

[0029] Figure 6 for Figure 4 A cross-sectional view of a rolling roller of a pole piece active material stripping device;

[0030] Figure 7 for Figure 4 A schematic diagram of the distribution of multiple rolling rollers of a pole piece active material stripping device;

[0031] Figure 8 A schematic diagram of the structure of a rolling roller of a pole piece active material stripping device provided in one embodiment of the present application;

[0032] Fig. 9 A side view of a pole piece active material stripping device provided in one embodiment of the present application;

[0033] Fig.10 for Fig. 9 Schematic diagram of the structure of the rolling device of the electrode active material stripping equipment.

[0034] Description of reference numerals:

[0035] 100, conveying device; 101, feeding end; 102, discharging end; 110, conveying roller; 120, conveying belt; 121, conveying bearing surface; 130, driving device;

[0036] 200, rolling device; 201, arc-shaped extrusion surface; 210, rolling roller; 211, circumferential outer wall; 220, rolling convex part; 221, arc-shaped convex surface; 222, rolling protrusion; 230, reference identification structure; 240, rolling plate; 241, arc-shaped bottom wall;

[0037] 300. Recovery device;

[0038] 400, pole piece. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] At present, there are two ways to collect the active materials of the pole piece. One is to use a crusher to crush the pole piece as a whole, and then use a screening machine to screen the crushed active materials of the pole piece to separate particles of different sizes, and finally collect and extract each element. The second is to pre-treat the pole piece, and then peel the active materials on the pole piece from the current collector, so as to initially separate the active materials from the current collector, and then extract each element in the active material.

[0041] The first method can simplify the pre-treatment process of the electrode, but it will increase the subsequent steps of separating the elements. Although the second method adds a pre-treatment step in the early stage, the subsequent steps of separating the elements will be easier.

[0042] After long-term research, the inventors found that in the process using the second collection method, when the electrode is in a relatively dry state, the active material coated on the current collector is more prone to cracking and breaking.

[0043] In view of this, the present embodiment provides a pole piece active material stripping device, which strips the active material coated on the current collector by applying extrusion force and friction force to the pole piece, thereby replacing the current method of manually scraping off the active material by the operator, thereby improving the stripping efficiency of the active material.

[0044] The specific structure of the electrode active material stripping device of this embodiment is described below with reference to the accompanying drawings.

[0045] like Figures 1 to 3 As shown, the pole piece active material stripping equipment of this embodiment includes a conveying device 100 and a rolling device 200 .

[0046] The conveying device 100 includes a feed end 101, a discharge end 102, and a conveying bearing surface 121 located between the feed end 101 and the discharge end 102, and the conveying bearing surface 121 is used to carry and transport the electrode 400;

[0047] The rolling device 200 can be movably disposed above the conveying bearing surface 121 . The rolling device 200 includes an arc-shaped extrusion surface 201 . The arc-shaped extrusion surface 201 is extrusion-matched with the conveying bearing surface 121 .

[0048] Using the technical solution of this embodiment, the conveying device 100 includes a conveying bearing surface 121, and the conveying bearing surface 121 is used to carry and transport the pole piece 400. Specifically, the pole piece 400 includes a current collector and an active material coated on the current collector, and the pole piece 400 can move from the feed end 101 to the discharge end 102. A rolling device 200 is provided on the top of the conveying device 100, and the rolling device 200 includes an arc-shaped extrusion surface 201, and the arc-shaped extrusion surface 201 is extruded and matched with the conveying bearing surface 121. In this process, the arc-shaped extrusion surface 201 can apply an extrusion force to the conveying bearing surface 121. When the pole piece 400 passes under the arc-shaped extrusion surface 201, the arc-shaped extrusion surface 201 can apply an extrusion force to the pole piece 400, thereby aggravating the degree of fragmentation of the active material. At the same time, since the rolling device 200 is movably arranged, the rolling device 200 will drive the arc-shaped extrusion surface 201 to move during the movement, so that the arc-shaped extrusion surface 201 applies a tangential force tangential to the arc-shaped extrusion surface 201 to the active material, thereby making it easier for the active material to be peeled off from the current collector. In addition, under the extrusion and movement of the rolling device 200, the friction between the arc-shaped extrusion surface 201 and the active material will also increase, so that the rolling device 200 can achieve a scraping effect on the active material, thereby increasing the probability of peeling the active material from the current collector.

[0049] Therefore, this embodiment realizes automatic feeding of the electrode 400 through the conveying device 100, and realizes stripping of the active material through the extrusion cooperation and relative movement between the rolling device 200 and the conveying bearing surface 121, thereby achieving the effect of efficiently and conveniently stripping the active material from the electrode.

[0050] Exemplarily, the rolling device 200 may be disposed above the conveying bearing surface 121 in a manner of rotation, swinging, vibration, etc., and the above-mentioned activities can exert a scraping effect on the active material.

[0051] Specifically, Figure 1 and Figure 2 As shown, the conveying device 100 may include a plurality of conveying rollers 110 , a conveying belt 120 and a driving device 130 . The conveying rollers 110 support the conveying belt 120 , and the driving device 130 drives the conveying belt 120 to rotate, thereby realizing the conveying and carrying of the pole piece 400 .

[0052] It should be noted that before the pole piece 400 is sent to the pole piece active material stripping device, the pole piece 400 can be subjected to high temperature treatment to dry and crack the active material on the pole piece 400, making it easier to fall off from the current collector.

[0053] Furthermore, if Figures 1 to 3As shown, in some embodiments, the laminating device 200 includes a laminating roller 210 , which is rotatably disposed above the conveying bearing surface 121 , and a circumferential outer wall 211 of the laminating roller 210 forms an arc-shaped extrusion surface 201 .

[0054] In the above structure, the rolling roller 210 can, on the one hand, exert a squeezing effect on the pole piece 400, accelerate the fragmentation of the active material, and make it easier for it to fall off the current collector. On the other hand, when the rolling roller 210 rotates, its circumferential outer wall 211 can exert a force on the active material along the tangential direction of the rolling roller 210, thereby peeling the fragmented active material from the current collector.

[0055] like Figures 1 to 3 As shown, in some embodiments, the laminating roller 210 includes a plurality of laminating rollers 210 , and the plurality of laminating rollers 210 are arranged at intervals in the conveying direction of the conveying device 100 .

[0056] Arranging a plurality of rolling rollers 210 can increase the number of times each electrode sheet is rolled, so that the active material adhering to the electrode sheet is gradually peeled off during the movement of the conveying device, thereby reducing the amount of active material retained on the current collector flowing out from the discharge end.

[0057] In order to improve the peeling effect of the rolling device 200 on the active material, Figures 4 to 7 As shown, in some embodiments, the laminating device 200 includes not only the laminating roller 210 but also a laminating convex portion 220 , and the laminating convex portion 220 is disposed on the circumferential outer wall of the laminating roller 210 .

[0058] Specifically, Figure 6 As shown, the rolling protrusion 220 includes an arcuate convex surface 221 which is pressed and matched with the pole piece 400 , and the circumferential outer wall 211 of the rolling roller 210 and the arcuate convex surface 221 of the rolling protrusion 220 form an arcuate extrusion surface 201 .

[0059] In the above structure, since the rolling protrusion 220 is arranged on the circumferential outer wall 211 of the rolling roller 210, the circumferential outer wall 211 of the rolling roller 210 and the arcuate convex surface 221 of the rolling protrusion 220 jointly form an arcuate extrusion surface 201. This arrangement can increase the extrusion force on the electrode sheet 400 through the rolling protrusion 220 on the one hand, and on the other hand, it also increases the roughness of the arcuate extrusion surface 201. During the rotation of the rolling roller 210, the arcuate extrusion surface 201 can more easily scrape the active material off the current collector, thereby improving the stripping effect of the rolling device 200 on the active material.

[0060] Furthermore, if Figure 5 and Figure 6As shown, in some embodiments, a plurality of rolling protrusions 220 are provided on each rolling roller 210, and the plurality of rolling protrusions 220 are spaced apart in the circumferential direction of the rolling roller 210. Such a configuration can increase the setting points of the rolling protrusions 220 on each rolling roller 210, thereby increasing the probability of the rolling protrusions 220 contacting the pole piece 400, thereby helping to improve the scraping effect of the rolling device 200 on the active material.

[0061] It should be noted that when the electrode piece 400 moves on the conveying bearing surface 121 , some areas of the electrode piece may contact the rolling protrusions 220 multiple times, but some areas may not contact the rolling protrusions 220 , thereby reducing the stripping rate of the active material.

[0062] To solve the above problems, Figure 7 As shown, in some embodiments, the rotation speeds of multiple rolling rollers 210 are the same, and the initial installation angles of two adjacent rolling rollers 210 are different, so that the rolling protrusions 220 on the two adjacent rolling rollers 210 are misaligned or partially overlapped in the rolling areas on the same pole piece 400. During the movement of the pole piece 400, each time the pole piece 400 moves to the bottom of the next rolling roller 210, the rolling protrusions 220 can contact the unrolled area, so that after the pole piece 400 is rolled multiple times by multiple rolling rollers 210, the retention rate of the active material is greatly reduced.

[0063] It should be noted that the number of the rolling rollers 210 can be 2 to 6 to ensure the stripping effect on the active material. For example, the number of the rolling rollers 210 can be 6.

[0064] like Figure 6 As shown, since the laminating roller 210 may be a centrally symmetrical shape, the initial installation angle of two adjacent laminating rollers 210 is difficult to adjust. In order to solve this problem, as shown in FIG. Figure 7 As shown, in some embodiments, a reference identification structure 230 may be provided on each laminating roller 210 , and the reference identification structure 230 is used to mark the rotation angle of the laminating roller 210 , thereby facilitating the adjustment of the initial installation angle of the laminating roller 210 .

[0065] Specifically, the angle β between the reference identification structures 230 on two adjacent rolling rollers 210 satisfies: 10°≤β≤20°, so that when the pole piece 400 moves to the bottom of the next rolling roller 210, the rolling protrusion 220 contacts the unrolled area as much as possible, thereby ensuring the stripping effect on the active material.

[0066] Exemplarily, the angle β can be 10°, 15°, 20°, etc. It should be noted that the angle β should not be too large, but the number of rolling rollers 210 can be increased so that the active material of the pole piece 400 can be gradually stripped off during the movement, and as little unstripped area as possible should be left.

[0067] Exemplarily, the reference identification structure 230 may be disposed on the end surface of the laminating roller and extend along the radial direction of the end surface of the laminating roller. The reference identification structure 230 may be a linear protrusion structure or a groove structure.

[0068] It should be noted that the rolling protrusion 220 may be a strip structure continuously arranged along the axial direction of the rolling roller, or may be a plurality of rolling protrusions arranged at intervals in the axial direction of the rolling roller.

[0069] like Figure 8 As shown, in some embodiments, when each rolling protrusion 220 includes a plurality of rolling protrusions 222, the plurality of rolling protrusions 222 are spaced apart in the axial direction of the rolling roller 210, and the rolling protrusions 222 on two adjacent rolling rollers 210 are staggered in the width direction of the conveying device 100, so that each time the pole piece 400 moves to the bottom of the next rolling roller 210, the rolling protrusion 220 can contact the unrolled area, thereby greatly reducing the retention rate of the active material of the pole piece 400 after multiple rollings by multiple rolling rollers 210.

[0070] like Figure 6 As shown, in some embodiments, the radius R of the arcuate convex surface 221 of each rolled protrusion 220 satisfies: 5mm≤R≤10mm, so that the rolled protrusion 220 can both increase the squeezing pressure on the pole piece 400 and avoid tearing of the pole piece 400 due to excessive squeezing pressure.

[0071] Exemplarily, the radius R of the arcuate convex surface 221 of each rolled protrusion 220 may be 5 mm, 7 mm, 9 mm, 10 mm, etc.

[0072] Furthermore, if Figure 6 As shown, the central angle α corresponding to the arcuate convex surface 221 of each rolling protrusion 220 satisfies: 20°≤α≤270°. If the angle α is too small, the stripping effect on the active material will be reduced. If the angle α is too large, the smoothness of the rotation of the rolling roller will be reduced. Therefore, the above range can ensure the smoothness of the rotation of the rolling roller while ensuring the stripping effect on the active material.

[0073] Exemplarily, the angle α may be 20°, 30°, 45°, 60°, 90°, 180°, 270°, etc.

[0074] Furthermore, if Figure 6 As shown, the distance L between the centers of the circles corresponding to two adjacent arc-shaped convex surfaces 221 satisfies: 20mm≤L≤80mm. Such a setting can ensure the probability of the arc-shaped convex surface 221 contacting the pole piece 400, thereby ensuring the scraping effect on the pole piece 400.

[0075] Exemplarily, the value of L may be 20 mm, 40 mm, 60 mm or 80 mm.

[0076] Furthermore, if Figure 6 As shown, the diameter D of the circumferential outer wall of the rolling roller 210 satisfies: 50mm≤D≤150mm. If the diameter D of the circumferential outer wall of the rolling roller 210 is too large, the driving burden of the rolling roller 210 will be increased. If the diameter D of the circumferential outer wall of the rolling roller 210 is too small, the setting area of ​​the arc-shaped extrusion surface 201 will be reduced, thereby affecting the scraping effect of the active material. Therefore, keeping the diameter D of the circumferential outer wall of the rolling roller 210 within the above range can reduce the driving burden of the rolling roller 210 while ensuring the setting area of ​​the arc-shaped extrusion surface 201, thereby reducing energy consumption.

[0077] like Figure 1 As shown, in some embodiments, the pole piece active material stripping device further includes a recovery device 300, wherein the recovery device 300 has a separation chamber, wherein a sieve plate is disposed in the separation chamber, and the sieve plate separates the separation chamber into a separation chamber located above the sieve plate and a recovery chamber located below the sieve plate, and the discharge end 102 of the conveying device 100 is connected to the separation chamber. The recovery device 300 can separate and collect the current collector and the active material, thereby improving the functionality of the pole piece active material stripping device.

[0078] It should also be noted that if Fig. 9 and Fig.10 As shown, in some embodiments, the rolling device 200 can also be configured as a rolling plate 240, the bottom of the rolling plate 240 is provided with an arc-shaped bottom wall 241, the arc-shaped bottom wall 241 forms an arc-shaped extrusion surface 201 in contact with the pole piece 400, and the rolling plate 240 is swung by the driving device, and the active material is squeezed and scraped during the swinging of the rolling plate 240. Of course, a rolling convex portion 220 can also be provided on the arc-shaped bottom wall 241, and the arc-shaped convex surface 221 of the rolling convex portion 220 and the arc-shaped bottom wall 241 jointly form an arc-shaped extrusion surface 201, so as to further improve the scraping effect on the active material.

[0079] In the description of this application, it should 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, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0082] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0083] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A pole piece active material stripping device, characterized in that: include: A conveying device, comprising a feed end, a discharge end and a conveying bearing surface located between the feed end and the discharge end, wherein the conveying bearing surface is used to bear and transport the electrode piece; The rolling device is movably arranged above the conveying bearing surface, and the rolling device includes an arc-shaped extrusion surface, and the arc-shaped extrusion surface is extruded and matched with the conveying bearing surface.

2. The pole piece active material stripping device according to claim 1, characterized in that: The rolling device comprises a rolling roller, which is rotatably arranged above the conveying bearing surface, and the circumferential outer wall of the rolling roller forms the arc-shaped extrusion surface.

3. The pole piece active material stripping device according to claim 2, characterized in that: The laminating rollers include a plurality of laminating rollers, which are arranged at intervals in the conveying direction of the conveying device.

4. The pole piece active material stripping device according to claim 3, characterized in that: The rolling device further comprises a rolling convex portion, wherein the rolling convex portion is arranged on the circumferential outer wall of the rolling roller. The rolling convex portion includes an arcuate convex surface which is pressed and matched with the pole piece, and the circumferential outer wall of the rolling roller and the arcuate convex surface of the rolling convex portion form the arcuate extrusion surface.

5. The pole piece active material stripping device according to claim 4, characterized in that: Each of the laminating rollers is provided with a plurality of laminating convex portions, and the plurality of laminating convex portions are arranged at intervals in the circumferential direction of the laminating roller.

6. The pole piece active material stripping device according to claim 5, characterized in that: The rotation speeds of the plurality of rolling rollers are the same, and the initial installation angles of two adjacent rolling rollers are different, so that the rolling protrusions on the two adjacent rolling rollers are misaligned or partially overlapped in the rolling area on the same pole piece.

7. The pole piece active material stripping device according to claim 6, characterized in that: Each of the rolling rollers is provided with a reference identification structure, and the reference identification structure is used to mark the rotation angle of the rolling roller. The angle β between the reference identification structures on two adjacent rolling rollers satisfies: 10°≤β≤20°.

8. The pole piece active material stripping device according to claim 6 or 7, characterized in that: Each of the rolling convex portions includes a plurality of rolling protrusions, and the plurality of rolling protrusions are arranged at intervals in the axial direction of the rolling roller, and the rolling protrusions on two adjacent rolling rollers are staggered in the width direction of the conveying device.

9. The pole piece active material stripping device according to any one of claims 4 to 7, characterized in that: The radius R of the arc-shaped convex surface of each rolling convex portion satisfies: 5mm≤R≤10mm; And / or, the central angle α corresponding to the arc-shaped convex surface of each rolling convex portion satisfies: 20°≤α≤270°; And / or, the distance L between the centers of circles corresponding to two adjacent arc-shaped convex surfaces satisfies: 20 mm ≤ L ≤ 80 mm; And / or, the diameter D of the circumferential outer wall of the rolling roller satisfies: 50mm≤D≤150mm.

10. The pole piece active material stripping device according to any one of claims 1 to 7, characterized in that: The pole piece active material stripping device also includes: A recovery device is provided with a separation chamber, a sieve plate is arranged in the separation chamber, the sieve plate divides the separation chamber into a separation chamber located above the sieve plate and a recovery chamber located below the sieve plate, and the discharge end of the conveying device is connected to the separation chamber.

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