Trimming discharge device, roller pressing system and method for preparing electrode sheet

Abstract

The present application relates to the technical field of battery manufacturing, and provides a trimming discharge device, a roller pressing system and a method for preparing an electrode sheet for use in an electrode sheet preparation process. The trimming discharge device comprises: a rotating shaft; a trimming transfer wheel sleeved on the rotating shaft and configured to engage with a film pressure roller to transfer film trimmings from the film pressure roller to the wheel surface of the trimming transfer wheel; and a scraper configured to fit the wheel surface of the trimming transfer wheel to scrape off the film trimmings transferred to the wheel surface of the trimming transfer wheel.

Description

Edge material guide device, roller pressing system and method for preparing electrode sheet

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 202311218299.3 filed on September 20, 2023, entitled “Edge Material Guide Device, Rolling System and Method for Preparing Electrode Sheets”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the technical field of lithium battery production, and in particular to a scrap material guide device, a rolling system and a method for preparing an electrode sheet used in an electrode sheet preparation process. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] The manufacturing process of battery electrodes typically involves rolling, thinning, trimming, and removing the scrap. During this removal process, a scraper is used to scrape the scrap off the roller surface. This creates a risk of the scraper piling up against the scraper, squeezing and damaging the normal film area, thus impacting electrode quality and production efficiency.

[0006] Summary of the Invention

[0007] The present application aims to alleviate at least one of the technical problems existing in the background art. To this end, one purpose of the present application is to provide a scrap material discharge device, a roller pressing system, and a method for preparing an electrode sheet, so that the scrap material produced by trimming and shaping can be discharged without damaging the normal film area to a certain extent, thereby improving the product quality and production efficiency of the electrode sheet.

[0008] An embodiment of the first aspect of the present application provides a scrap material guide device, comprising: a rotating shaft; a scrap material transfer wheel, which is sleeved on the rotating shaft and is configured to engage with a diaphragm pressure roller to transfer the diaphragm scrap material from the diaphragm pressure roller to the wheel surface of the scrap material transfer wheel; and a scraper, which is configured to fit with the wheel surface of the scrap material transfer wheel to scrape off the diaphragm scrap material transferred to the wheel surface of the scrap material transfer wheel.

[0009] In the technical solution of the embodiment of the present application, a scraper is provided to transfer the trimmed and shaped scraps from the membrane press roller to the surface of the scraper, and a scraper is provided to contact the wheel surface to scrape the scraps from the scraper. This, to a certain extent, avoids the risk of scraps piling up on the scraper and then squeezing and damaging the normal membrane area when using a traditional scraper, thereby improving the product quality and production efficiency of the electrode sheet. At the same time, the surface of the membrane press roller will not be worn due to the provision of the scraper, thereby to a certain extent avoiding the resulting decrease in the weight consistency of the electrode sheet, which is also conducive to improving the product quality and production efficiency of the electrode sheet.

[0010] In some embodiments, the scrap material discharge device further includes a first displacement mechanism configured to adjust the axial positioning of the scrap material transfer wheel on the rotating shaft. The first displacement mechanism enables the scrap material transfer wheel to move axially on the rotating shaft. Thus, by adjusting the axial positioning of the scrap material transfer wheel on the rotating shaft according to the production requirements of electrode sheets with different membrane area widths, the scrap material discharge device can be adapted to the production of electrode sheets with different membrane area widths, thereby improving the applicability of the scrap material discharge device for the production of electrode sheets with different membrane area widths.

[0011] In some embodiments, the circumferential surface of the rotating shaft is provided with one of a keyway and a key block, and the first displacement mechanism includes: a sleeve, which is coaxially arranged with the edge material transfer wheel and located at the center of the edge material transfer wheel; the other of the keyway and the key block, which is arranged on the inner surface of the sleeve; and at least one limit block, which is arranged on the circumferential surface of the rotating shaft and is used to limit the axial movement of the edge material transfer wheel. Thus, as the key block slides in the keyway, the edge material transfer wheel also moves axially on the rotating shaft, and the limit block is used to confine the edge material transfer wheel to a fixed position, thereby meeting the requirements of preparing electrode sheets with different membrane area widths.

[0012] In some embodiments, the scrap material discharge device further includes a second displacement mechanism configured to adjust the positioning of the scrap material transfer wheel relative to the membrane pressing roller. Thus, the distance between the scrap material transfer wheel and the membrane pressing roller surface, as well as the degree of contact and pressure, can be adjusted based on the production requirements of different electrode sheets, thereby improving the applicability of the scrap material discharge device for producing electrode sheets of varying thicknesses.

[0013] In some embodiments, the second displacement mechanism includes a slide cylinder or a hydraulic lift, thereby stably controlling the distance and degree of contact between the edge material transfer wheel surface and the membrane pressing roller surface, thereby meeting the requirements for preparing electrode sheets of different thicknesses.

[0014] In some embodiments, the scrap material guide device includes a pair of fixed mounting plates, each of which is connected to the ends of the rotating shaft. Thus, by providing the fixed mounting plates, a stable structure is provided for the scrap material guide device in a relatively simple manner, and a connection point is also provided for the rotating shaft.

[0015] In some embodiments, the scrap material outlet device includes a drive motor configured to drive the scrap material transfer wheel to rotate. Thus, the scrap material transfer wheel is driven by the drive motor, and the rotation of the scrap material transfer wheel is driven by electricity, which is beneficial to industrial continuous production.

[0016] In some embodiments, the scrap material discharge device includes multiple scrap material transfer wheels, which are spaced apart along the axial direction of the rotating shaft. Thus, the scrap material discharge device with multiple scrap material transfer wheels can be used in conjunction with a trimming device with multiple cutters to achieve switching of the electrode sheet film width and the number of film areas according to design requirements, thereby improving the applicability of the scrap material discharge device for preparing electrode sheets with different numbers of film areas.

[0017] In some embodiments, the scrap material removal device includes a drive belt and a synchronous pulley. The drive belt connects the drive motor and the synchronous pulley, and the synchronous pulley and multiple scrap material transfer pulleys are sleeved on a rotating shaft. The synchronous pulley and the multiple scrap material transfer pulleys all have a common rotating shaft. Therefore, when the drive motor is running, the drive motor drives the synchronous pulley via the drive belt to rotate, and the multiple scrap material transfer pulleys coaxial with the synchronous pulley also rotate simultaneously. Therefore, when the number of film areas needs to be changed during electrode sheet preparation, the scrap material removal device only needs to adjust the number of scrap material transfer pulleys installed on the rotating shaft, without adding multiple motors, which controls investment costs. At the same time, the structure is simple and easy to disassemble and assemble.

[0018] In some embodiments, the scrap material discharge device includes multiple drive motors, each configured to drive a plurality of scrap material transfer wheels. Because the drive motors are independent of one another, the scrap material transfer wheels do not need to be coaxially arranged. This allows the placement of each scrap material transfer wheel to be tailored to the needs of the structural layout, providing flexibility in the layout of the scrap material discharge device.

[0019] In some embodiments, the width of the scraper is greater than the distance between the outer edges of the two outermost scraper transfer wheels of the plurality of scraper transfer wheels. Thus, a single scraper is provided to scrape off scraps from all scraper transfer wheels, thereby simplifying the overall structure of the scraper guide device.

[0020] In some embodiments, the scrap material removal device includes multiple scrapers configured to mate with the surfaces of multiple scrap material transfer wheels. Due to differences in the machining dimensions of each scrap material transfer wheel and potential installation errors, the surfaces of multiple scrap material transfer wheels may not be aligned, creating the risk of not being able to simultaneously remove scrap material from all of them. Therefore, providing each scrap material transfer wheel with its own scraper prevents untransferred scrap material from remaining on the wheel, thereby reducing the possibility of damaging the normal film area.

[0021] In some embodiments, the ratio of the edge material transfer wheel diameter to the membrane press roller diameter is 1:2 to 1:20, and the width of the edge material transfer wheel surface is 10 mm to 800 mm. Friction exists between the edge material transfer wheel and the membrane press roller. To minimize frictional work loss, the contact area between the edge material transfer wheel and the membrane press roller can be reduced. Therefore, by limiting the range of the edge material transfer wheel diameter and wheel surface width, frictional losses can be reduced to a certain extent.

[0022] In some embodiments, the material of the edge material transfer wheel is a natural polymer material or a synthetic polymer material. Thus, by limiting the material of the edge material transfer wheel, the edge material is more easily transferred from the surface of the film pressing roller to the surface of the edge material transfer wheel.

[0023] In some embodiments, the material of the edge material transfer wheel is silicone rubber. Thus, by selecting the material of the edge material transfer wheel as silicone rubber, the edge material is more easily transferred from the surface of the diaphragm pressure roller to the surface of the edge material transfer wheel.

[0024] An embodiment of the second aspect of the present application provides a rolling system, which includes a membrane pressing roller, which is configured to convey a membrane; a trimming device, which is configured to cut the membrane into a membrane to be formed and a membrane edge material; and an edge material guide device according to any one of the first aspects of the present application, the edge material guide device is located downstream of the trimming device in the conveying direction of the membrane. By integrating any one of the edge material guide devices in the first aspect of the present application into the rolling system, the edge material attached to the membrane pressing roller is completely transferred to the edge material transfer wheel. The use of the above rolling system is conducive to the continuous preparation of electrode sheets, and the electrode sheets produced with edge burr sizes that meet the specifications and no edge material residue in the blank area of ​​the foil can be directly used in battery production.

[0025] In some embodiments, the roller pressing system includes a first roller configured to engage with the membrane roller and be located upstream of the trimming device in the membrane conveying direction; and a second roller configured to engage with the membrane roller and be located downstream of the edge material removal device in the membrane conveying direction. Thus, the first roller and the second roller are provided to simultaneously perform the two process steps of thinning the membrane and combining the formed membrane with the current collector.

[0026] In some embodiments, the trimming device includes cutters, the position and number of which match the position and number of the edge material transfer wheels. This allows the roller pressing system to cut the membrane sheet according to the number of film zones required. In conjunction with the downstream edge material transfer device, electrode sheets with different numbers of film zones can be produced.

[0027] The third aspect of the present application provides a method for preparing an electrode sheet using the second aspect of the present application, comprising: conveying a membrane via a membrane roller; cutting the membrane into a membrane to be formed and membrane scrap by a trimming device; transferring the membrane scrap from the membrane roller to the wheel surface of the scrap transfer wheel by a scrap transfer wheel of a scrap deflection device; and conveying the membrane to be formed downstream via the membrane roller for compounding with a current collector to obtain an electrode sheet. Thus, the electrode sheet prepared using this method has no wavy or jagged edges, and the burr size meets the production specification requirements, enabling continuous production of electrode sheets.

[0028] In some embodiments, conveying the film through the film pressing roller includes passing the film between the film pressing roller and a first pressing roller to reduce the film thickness by squeezing the film pressing roller and the first pressing roller.

[0029] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0031] FIG1 is a schematic structural diagram of a scrap material outlet device 100 according to some embodiments of the present application;

[0032] FIG2 is a front view of a scrap material outlet device 100 according to some embodiments of the present application;

[0033] FIG3 is a side view of a scrap material outlet device 100 according to some embodiments of the present application;

[0034] FIG4 is a schematic diagram of the installation position of the edge material outlet device 100 according to some embodiments of the present application;

[0035] FIG5 is a schematic diagram of a method 500 for preparing an electrode sheet 20 according to some embodiments of the present application.

[0036] Explanation of the accompanying drawings: 10-roller pressing system; 11-support roller; 12-first pressing roller; 13-diaphragm pressing roller; 14-third pressing roller; 15-trimming device; 20-electrode sheet; 100-edge material outlet device; 111-edge material transfer wheel (111a-first edge material transfer wheel; 111b-second edge material transfer wheel); 112-rotating shaft; 113-limiting block; 121-scraper; 122-scraper mounting upper pressure plate; 123-scraper mounting lower support plate; 131-fixed mounting plate; 132-middle fixed mounting plate; 133-bottom fixed mounting plate; 141-sealed bearing; 142-slide cylinder; 143-synchronizing wheel; 144-transmission belt; 145-drive motor; 500: method for preparing electrode sheet. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", "lateral", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] As mentioned above, the process of preparing positive / negative electrode sheets generally includes processes such as roller thinning, trimming and shaping, and edge material extraction. Generally, when a scraper is used to scrape the edge material off the roller in the edge material extraction process, there is a risk that the edge material will pile up on the scraper and squeeze and damage the normal membrane area, thereby affecting the quality and production efficiency of the electrode sheet. At the same time, the scraper's close contact with the roller surface will wear the surface of the membrane pressing roller, resulting in a decrease in the weight consistency of the electrode sheet, which will also affect the quality and production efficiency of the electrode sheet.

[0046] To address the drawbacks of the traditional scrap material removal process, which uses a scraper to remove scrap material from a roller, embodiments of the present application provide a scrap material removal device, a roller pressing system, and a method for preparing an electrode sheet. The scrap material removal device includes: a rotating shaft; a scrap material transfer wheel, which is sleeved on the rotating shaft and is configured to engage with the membrane pressing roller to transfer the membrane scrap material from the membrane pressing roller to the wheel surface of the scrap material transfer wheel; and a scraper, which is configured to contact the wheel surface of the scrap material transfer wheel to scrape off the membrane scrap material that has been transferred to the wheel surface of the scrap material transfer wheel.

[0047] The scrap material discharge device disclosed in the embodiment of the present application can be applied to all electrode sheet manufacturing processes that require rolling equipment. For example, the active material used to prepare the positive electrode sheet is a mixture of one or more of the following materials: lithium-containing phosphate with an olivine structure; lithium transition metal oxides such as lithium nickel cobalt manganese oxide, lithium cobalt oxide, lithium manganese oxide and lithium nickel cobalt aluminum oxide and their modified compounds. The material used to prepare the negative electrode sheet is a mixture of one or more of the following materials: carbon materials such as natural graphite, artificial graphite, mesophase carbon microbeads, hard carbon, soft carbon; silicon materials such as silicon oxide, silicon nanowires, composite silicon carbon; metallic lithium and its alloy materials, etc. The scrap material discharge device disclosed in the embodiment of the present application is not limited to the preparation of lithium-ion electrode sheets, but is also applicable to the preparation scenarios of new batteries such as sodium-ion batteries and solid-state batteries.

[0048] The present invention provides a scrap material outlet device. Figure 1 is a schematic structural diagram of a scrap material outlet device 100 according to some embodiments of the present invention; Figure 2 is a front view of the scrap material outlet device 100 according to some embodiments of the present invention; and Figure 3 is a side view of the scrap material outlet device 100 according to some embodiments of the present invention.

[0049] Referring to Figures 1 to 3, the edge material guide-out device 100 includes a rotating shaft 112; an edge material transfer wheel 111, which is sleeved on the rotating shaft 112 and is configured to engage with the membrane pressure roller 13 in Figure 4 to transfer the membrane edge material from the membrane pressure roller 13 to the wheel surface of the edge material transfer wheel 111; and a scraper 121, which is configured to fit with the wheel surface of the edge material transfer wheel 111 to scrape off the membrane edge material transferred to the wheel surface of the edge material transfer wheel 111.

[0050] In the embodiment of the present application, the scrap transfer wheel 111 is cylindrical and is sleeved onto the rotating shaft 112 along its centerline. The wheel surface of the scrap transfer wheel 111 engages with the wheel surface of the film pressing roller 13, thereby transferring the film scrap from the wheel surface of the film pressing roller 13 to the wheel surface of the scrap transfer wheel 111. The scraper 121 is in contact with the wheel surface of the scrap transfer wheel 111 to scrape off the scrap adhering to the wheel surface of the scrap transfer wheel 111.

[0051] Thus, by providing the edge material transfer wheel 111, the edge material attached to the membrane pressing roller 13 after trimming and shaping can be transferred to the surface of the edge material transfer wheel 111. The edge material on the membrane pressing roller 13 is not scraped off by a scraper. Therefore, to a certain extent, it can prevent the edge material from being squeezed and damaged in the normal membrane area after being piled up at the scraper. The edges of the prepared electrode sheets are less likely to have wavy edges, jagged edges, and burrs, and the size meets the production specifications. They can be directly assembled into batteries, improving battery safety performance. In addition, the surface of the membrane pressing roller 13 will not be worn due to the provision of a scraper, so the weight consistency of the electrode sheets is effectively guaranteed, and the product quality and production efficiency of the electrode sheets 20 can also be improved.

[0052] According to some embodiments of the present application, the scrap material outlet device 100 further includes a first displacement mechanism, which is configured to adjust the axial positioning of the scrap material transfer wheel 111 on the rotating shaft 112 .

[0053] The first displacement mechanism is used to adjust the position of the edge material transfer wheel 111 along the axial direction on the rotating shaft 112. The first displacement mechanism may include but is not limited to a slide rail, and the first displacement mechanism may also be a key block and key groove structure.

[0054] Therefore, according to the preparation requirements of electrode sheets with different membrane area widths, the first displacement mechanism is used to adjust the position of the edge material transfer wheel 111 on the rotating shaft 112, which can be suitable for the preparation of electrode sheets with different membrane area widths, thereby improving the applicability of the edge material outlet device for the preparation of electrode sheets with different membrane area widths.

[0055] According to some embodiments of the present application, the circumferential surface of the rotating shaft 112 is provided with one of a keyway and a key block, and the first displacement mechanism includes: a sleeve, which is coaxially arranged with the edge material transfer wheel 111 and located at the center of the edge material transfer wheel 111; the other of the keyway and the key block, the other of the keyway and the key block is arranged on the inner surface of the sleeve; at least one limit block 113, at least one limit block 113 is arranged on the circumferential surface of the rotating shaft 112, for limiting the axial movement of the edge material transfer wheel 111.

[0056] The edge material transfer wheel 111 can be sleeved on the rotating shaft 112 through the sleeve of the embedded key block, and the cooperation between the sleeve and the rotating shaft 112 is achieved by the key block and the keyway. The length of the keyway determines the distance that the key block (and the edge material transfer wheel 111 connected to it) can move on the rotating shaft 112. Therefore, the keyway length is determined based on the range of the width of the edge material to be extracted. It should be noted that it is not limited to adjusting the position of the edge material transfer wheel 111 on the rotating shaft 112 by the cooperation of one key block and keyway. Multiple key blocks and keyways can also be provided on the circumferential surface of the rotating shaft 112 to increase the stability of the transmission. When the edge material transfer wheel 111 extracts the edge material, the axial positioning of the edge material transfer wheel 111 is locked to avoid damage to the normal membrane area of ​​the electrode sheet 20, so that a limit block 113 can be provided. When the limit block 113 is locked on the rotating shaft 112, the position of the edge material transfer wheel 111 on the rotating shaft 112 is locked by the adjacent limit block 113. The number of the limiting blocks 113 is not limited, and the limiting blocks 113 can be set on both sides of the edge material transfer wheel 111 to achieve a better limiting effect.

[0057] Therefore, by setting up the first displacement mechanism in the above manner, the edge material transfer wheel 111 can be prevented from sliding laterally during the electrode sheet preparation process to a certain extent, which may cause possible damage to the normal membrane area of ​​the electrode sheet, and the electrode sheet with the required membrane area width can be stably obtained.

[0058] According to some embodiments of the present application, the edge material guide device 100 includes a second displacement mechanism, which is configured to adjust the positioning of the wheel surface of the edge material transfer wheel 111 relative to the membrane pressing roller 13.

[0059] As shown in FIG4 , the distance between the surface of the scrap transfer wheel 111 and the surface of the membrane pressing roller 13 is the thickness of the electrode sheet 20. Due to the large overall size of the rolling system 10, it is difficult to adjust the position of the rolling system 10 in the vertical direction. Therefore, a second displacement mechanism for adjusting the vertical positioning of the scrap transfer wheel 111 is provided at the scrap outlet device 100. A second displacement mechanism can also be provided at both ends of the scrap outlet device 100 to increase the stability of the scrap transfer wheel 111 during vertical movement.

[0060] Therefore, the distance and degree of contact and pressing between the wheel surface of the edge material transfer wheel 111 and the surface of the membrane pressing roller 13 are adjusted according to the preparation requirements of different electrode sheets 20, thereby improving the applicability of the edge material outlet device 100 for preparing electrode sheets of different thicknesses.

[0061] According to some embodiments of the present application, the second displacement mechanism includes a slide cylinder 142 or a hydraulic lift.

[0062] In engineering, the slide cylinder 142 and the hydraulic lift are components for controlling the vertical height of the components. Similarly, the slide cylinder 142 or the hydraulic lift can be provided at both ends of the scrap material guide device to increase the stability of the scrap material transfer wheel 111 when it moves vertically.

[0063] Therefore, the slide cylinder 142 or the hydraulic lift is used to stably control the distance and the degree of contact and pressing between the surface of the edge material transfer wheel 111 and the surface of the membrane pressing roller 13, thereby meeting the needs of preparing electrode sheets of different thicknesses.

[0064] According to some embodiments of the present application, the edge material outlet device 100 includes a pair of fixed mounting plates 131 , and the fixed mounting plates 131 are respectively connected to both ends of the rotating shaft 112 .

[0065] The fixed mounting plates 131 appear in pairs and define the maximum width of the edge material outlet device 100. The distance between the two fixed mounting plates 131 can be determined according to the width of the untrimmed electrode sheet, and can also be adjusted accordingly according to the specific membrane width and membrane area quantity requirements.

[0066] The two ends of the rotating shaft 112 are respectively connected to the fixed mounting plate 131. A sealed bearing 4 can be provided on the fixed mounting plate 131 to reduce the resistance of the rotating shaft 112 to rotation.

[0067] Therefore, by providing the fixed mounting plate 131, a stable structure is provided for the edge material guide device in a relatively simple manner, and a connection point is also provided for the rotating shaft.

[0068] According to some embodiments of the present application, the scrap material outlet device 100 includes a drive motor 145 , and the drive motor 145 is configured to drive the scrap material transfer wheel 111 to rotate.

[0069] The drive motor 145 is a driving component of the edge material transfer wheel 111, and its driving mode can be direct driving or indirect driving through another component. Which of the two driving modes is adopted can be specifically determined based on transmission requirements and structural layout.

[0070] Therefore, the edge material transfer wheel 111 is driven by the driving motor 145, and the rotation of the edge material transfer wheel 111 is driven by electricity, which is conducive to industrial continuous production.

[0071] According to some embodiments of the present application, the scrap material outlet device 100 includes a plurality of scrap material transfer wheels 111 , and the plurality of scrap material transfer wheels 111 are arranged at intervals along the axial direction of the rotating shaft 112 .

[0072] Multiple scrap transfer wheels 111 can be installed on the rotating shaft 112. The number and position of these wheels can be determined based on the specific film width and number of film areas required for the electrode sheet 20 to be produced. The width of each scrap transfer wheel 111 can vary, depending on the scrap width required to be transferred at each location. Similarly, each scrap transfer wheel 111 can be connected to the rotating shaft 112 via a key block and keyway, and each scrap transfer wheel can also be provided with a stopper 113.

[0073] Thus, the scrap material discharge device 100 having multiple scrap material transfer wheels 111 can be used in conjunction with the trimming device 15 having multiple cutters to meet the needs of preparing electrode sheets with different film widths and numbers of film areas. At the same time, since the positioning and width of the scrap material transfer wheels 111 can be adjusted, this also improves the applicability of the scrap material discharge device 100 for discharge electrode sheets 20 with different film widths and numbers of film areas.

[0074] According to some embodiments of the present application, the edge material outlet device 100 includes a transmission belt 144 and a synchronous wheel 143 . The transmission belt 144 connects the drive motor and the synchronous wheel 143 . The synchronous wheel 143 and multiple edge material transfer wheels 111 are sleeved on the rotating shaft 112 .

[0075] As shown in Figure 1, the drive motor drives the synchronous wheel 143 to rotate via a transmission belt 144. Two edge material transfer wheels 111 are arranged coaxially with the synchronous wheel 143 on both sides of the synchronous wheel 143. The drive motor indirectly drives the edge material transfer wheels 111 via the transmission belt 144. It should be noted that the lateral position of the synchronous wheel 143 and the transmission belt 144 is not necessarily limited to between the two edge material transfer wheels 111. The same technical effect can be achieved by arranging the synchronous wheel 143 and the transmission belt 144 near the fixed mounting plate 131. The number of synchronous wheels 143 and the transmission belt 144 is not limited to one set. A more stable transmission can be achieved by arranging synchronous wheels 143 and transmission belts at both ends of the edge material outlet device 100. Similarly, to prevent the synchronous wheel 143 from sliding laterally on the rotating shaft 112 during operation, a limit block 113 can also be provided adjacent to the synchronous wheel 143.

[0076] Thus, the drive motor can simultaneously drive multiple edge material transfer wheels 111 through indirect transmission. When the number of membrane areas needs to be changed during electrode sheet preparation, the edge material outlet device only needs to adjust the number of edge material transfer wheels installed on the rotating shaft without adding multiple motors, which is beneficial to controlling investment costs. At the same time, the structure is simple and easy to disassemble and assemble.

[0077] According to some embodiments of the present application, the scrap material outlet device 100 includes a plurality of drive motors, and the plurality of drive motors are configured to respectively drive a plurality of scrap material transfer wheels 111 to rotate.

[0078] Since the multiple edge material transfer wheels 111 are driven by their own driving motors respectively, the edge material transfer wheels 111 do not need to be arranged to share the same rotating shaft, so the layout position of each edge material transfer wheel 111 can be considered according to the needs of the structural layout.

[0079] Therefore, since the drive motors are independent of each other, there is no need to arrange multiple edge material transfer wheels in a coaxial form. Therefore, the layout position of each edge material transfer wheel can be considered according to the needs of the structural layout, which brings certain flexibility to the layout of the edge material outlet device.

[0080] According to some embodiments of the present application, the width of the scraper 121 is greater than the distance between outer edges of two outermost edge transfer wheels 111 among the plurality of edge transfer wheels 111 .

[0081] In order to make all the scraper wheels 111 share the same scraper 121 , the width of the scraper 121 is greater than the distance between the outer edges of the two outermost scraper wheels 111 among the multiple scraper wheels.

[0082] Therefore, a scraper 121 is provided to scrape off all the scraps on the scrap transfer wheel 111 , thereby reducing the number of required parts and simplifying the overall structure of the scrap outlet device 100 .

[0083] According to some embodiments of the present application, the scrap material outlet device 100 includes a plurality of scrapers 121 , and the plurality of scrapers 121 are configured to respectively fit with the wheel surfaces of a plurality of scrap material transfer wheels 111 .

[0084] When the edge material outlet device 100 has multiple edge material outlet wheels 111, scrapers 121 that fit the wheel surface are respectively provided for the multiple edge material outlet wheels 111, so that at least two edge material outlet wheels 121 share one scraper 121, or each edge material outlet wheel 111 is equipped with its own scraper 121.

[0085] When there are multiple edge material transfer wheels 111, even if the multiple edge material transfer wheels 111 share the same rotating shaft 112, the surfaces of the multiple edge material transfer wheels 111 may not be on the same horizontal line due to the possible processing errors and installation errors of each edge material transfer wheel 111. In this case, if the multiple transfer wheels 111 share the same scraper, the scraper cannot guarantee that it can simultaneously fit the surfaces of all edge material transfer wheels 111. The possible consequence is that the surface of a certain edge material transfer wheel may have uncleaned adhered edge material, which may be squeezed by the film pressing roller 13 and extend to both sides, damaging the normal film area edge. Therefore, providing a separate scraper 121 for each edge material transfer wheel 111 is conducive to avoiding the situation where untransferred edge material remains on the edge material transfer wheel, thereby avoiding possible damage to the normal film area.

[0086] According to some embodiments of the present application, the ratio of the diameter of the edge material transfer wheel 111 to the diameter of the film pressing roller is 1:2 to 1:20, and the width of the wheel surface of the edge material transfer wheel 111 is 10 mm to 800 mm.

[0087] In some embodiments, the ratio of the diameter of the edge material transfer wheel 111 to the diameter of the film pressing roller is 1:5. In some embodiments, the ratio of the diameter of the edge material transfer wheel 111 to the diameter of the film pressing roller is 1:10. In some embodiments, the ratio of the diameter of the edge material transfer wheel 111 to the diameter of the film pressing roller is 1:15.

[0088] In some embodiments, the width of the wheel surface of the edge material transfer wheel 111 is 300 mm to 500 mm. In some embodiments, the width of the wheel surface of the edge material transfer wheel 111 is 300 mm, 400 mm, or 500 mm.

[0089] Friction exists between the scrap transfer wheel 111 and the film pressing roller 13. To reduce frictional work loss, the contact area between the scrap transfer wheel 111 and the film pressing roller 13 can be reduced. Therefore, the diameter of the scrap transfer wheel 111 is selected based on the film pressing roller 13 with which the scrap transfer wheel 111 contacts. Furthermore, reducing the wheel surface width of the scrap transfer wheel 111 also helps reduce frictional losses. The above embodiment provides a range of options for scrap transfer wheel diameter and wheel surface width.

[0090] Therefore, by limiting the range of the diameter and wheel surface width of the edge material transfer wheel 111, the loss caused by friction can be reduced to a certain extent.

[0091] According to some embodiments of the present application, the material of the edge material transfer wheel 111 is a natural polymer material or a synthetic polymer material.

[0092] Because the interaction force between the polymer material and the electrode sheet 20 is greater than the interaction force between the metal material and the electrode sheet 20, using a polymer material to make the scrap transfer wheel 111 can make the scrap transfer easier. The scrap transfer wheel 111 can be made of a natural polymer material such as natural fiber and natural rubber, or a synthetic polymer material such as a carbon chain polymer material, a heterogeneous chain polymer material, an inorganic polymer material, or an elemental organic polymer material, such as synthetic plastic, synthetic rubber, or synthetic fiber. Specifically, it mainly includes plastics (polyethylenes, polypropylenes, polyvinyl chlorides, polystyrenes, polyvinyl alcohol, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, chlorinated polyethers, polyaniline, polypyrrole, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, etc.); engineering plastics (polyamide, polycarbonate, polyformaldehyde, polyimide, polysulfone, polyphenylene ether, polyphenylene sulfide, polyester, polyaryletherketone, etc.); fiber reinforced plastics (carbon fiber reinforced plastics, glass fiber reinforced plastics and aramid fiber reinforced plastics, etc.); synthetic rubbers (butyl rubber, nitrile rubber, styrene-butadiene rubber, chlorinated nitrile rubber, EPDM rubber, chloroprene rubber, fluororubber, chlorosulfonated polyethylene rubber, silicone rubber, etc.).

[0093] Therefore, by limiting the material of the edge material transfer wheel 11 , the edge material is more easily transferred from the surface of the membrane pressing roller 13 to the surface of the edge material transfer wheel 111 , thereby improving the product quality and production efficiency of the electrode sheet 20 .

[0094] According to some embodiments of the present application, the material of the edge material transfer wheel 111 is silicone rubber. Silicone rubber is a synthetic polymer material commonly used in industry. At the same time, silicone rubber is highly inert and does not react with most chemicals.

[0095] Therefore, by limiting the material of the edge material transfer wheel 11 to silicone rubber, the edge material is more easily transferred from the surface of the membrane pressing roller 13 to the surface of the edge material transfer wheel 111, thereby improving the product quality and production efficiency of the electrode sheet 20.

[0096] The present application provides a rolling system. FIG4 is a schematic diagram of the installation position of the edge material guide device of some embodiments of the present application. As shown in FIG4, a rolling system 10 includes: a film pressing roller 13, which is configured to convey the film; a trimming device 15, which is configured to cut the film into a film to be formed and film edge material; and an edge material guide device 100 according to any one of claims 1-15, which is located downstream of the trimming device 15 in the conveying direction of the film.

[0097] As shown in FIG4 , the rolling system 10 includes a film pressing roller 13 , a trimming device 15 and a scrap material outlet device 100 according to claims 1 to 15 . The scrap material outlet device 100 is located downstream of the trimming device 15 in the conveying direction of the film.

[0098] The membrane press rollers 13 convey the membrane. By providing a larger number of membrane press rollers 13, the mutual compression between them achieves the thinning of the membrane and the bonding process with the current collector. The width of the membrane press rollers 13 is set based on the maximum width of the membrane or fiberized material to be rolled. Because the diameter of the membrane press rollers 13 affects the relative linear velocity of adjacent roller surfaces, the diameter of the membrane press rollers 13 is determined based on the different electrode sheet production requirements.

[0099] The function of the trimming device 15 is to cut the film into the film to be formed and the film edge material. The number of cutters in the trimming device 15 is not limited and can be set according to the number of different film areas.

[0100] In order to guide the edge material on the film pressing roller 13, the edge material guiding device 100 is arranged downstream of the trimming device 15, thereby ensuring that the edge material generated by the trimming device is completely transferred to the surface of the edge material guiding wheel 111 under the action of viscosity.

[0101] The edge material extraction device 100 is combined with the roller thinning mechanism 10, and the edge material adhering to the membrane pressing roller 13 is extracted, so that the edge of the prepared electrode sheet 20 has fewer wavy edges or jagged edges, and the burr size meets the production specification requirements, which is conducive to the continuous production of electrode sheets.

[0102] According to some embodiments of the present application, the rolling system 10 includes a first rolling roller 12 and a second rolling roller 14. The first rolling roller 12 is configured to engage with the film rolling roller 13 and is located upstream of the edge trimming device 15 in the conveying direction of the film; the second rolling roller 14 is configured to engage with the film rolling roller 13 and is located downstream of the edge material guide device 100 in the conveying direction of the film.

[0103] Based on the membrane's conveying direction, the first pressing roller 12 is positioned upstream of the trimming device, while the second pressing roller 14 is positioned downstream. The first pressing roller 12 and the membrane pressing roller 13 squeeze each other to achieve the membrane thinning process. The membrane pressing roller 13 and the second pressing roller 14 combine the membrane and the current collector.

[0104] Therefore, by providing the first pressing roller 12 and the second pressing roller 14, the rolling system 10 can simultaneously complete the two process steps of thinning the membrane and combining the formed membrane with the current collector.

[0105] According to some embodiments of the present application, the trimming device 15 includes cutters, and the position and number of the cutters match the position and number of the edge material transfer wheels 111 .

[0106] Similar to having multiple edge material transfer wheels 111 , the number and positioning of the cutters can be determined according to the specific film width and film area quantity requirements, and the number and positioning of the cutters match the number and positioning of the edge material transfer wheels 111 .

[0107] Thus, the rolling system 10 may include a trimming device 15 having a plurality of cutters and a scrap material outlet device having a plurality of scrap material transfer wheels 111. When the number and positioning of the cutters match the number and positioning of the scrap material transfer wheels 111, the requirements for preparing electrode sheets 20 with different film widths and numbers of film areas can be met. The position of the cutters can be configured to be adjusted in the axial direction of the rotating shaft, thereby cooperating with the position-adjustable scrap material transfer wheels 111, thereby improving the applicability of the rolling system 10 for preparing electrode sheets 20 with different film widths and numbers of film areas.

[0108] This embodiment of the present application provides a method 500 for preparing an electrode sheet using an embodiment of the second aspect of the present application.

[0109] FIG5 is a schematic diagram of a method 500 for preparing an electrode sheet using a roller pressing system 10 according to some embodiments of the present application.

[0110] As shown in FIG5 , the method 500 includes:

[0111] In step 520, the film is conveyed by the film pressing roller 13;

[0112] In step 530, the film is cut into the film to be formed and the film edge by the trimming device 15;

[0113] In step 540 , the film scrap is transferred from the film pressing roller 13 to the wheel surface of the scrap transfer wheel 111 by the scrap transfer wheel 111 of the scrap outlet device 100 ;

[0114] In step 550 , the membrane to be formed is transported to the downstream by the membrane pressing roller 13 to be combined with the current collector to obtain the electrode sheet 20 .

[0115] Therefore, the edges of the electrode sheets prepared using this method are less likely to have wavy or jagged edges, and the burr size meets the production specification requirements, which can realize the continuous production of electrode sheets.

[0116] In some embodiments, conveying the film through the film pressing roller 13 includes step 510 of passing the film between the film pressing roller 13 and the first pressing roller 12 to reduce the film through squeezing of the film pressing roller 13 and the first pressing roller 12 .

[0117] As shown in FIG4 , the first pressing roller 12 is arranged upstream of the membrane pressing roller 13. In the embodiment of FIG4 , the roller surfaces of the first pressing roller 12 and the membrane pressing roller 13 are parallel. In some embodiments, in step 510 , the distance between the first pressing roller 12 and the membrane pressing roller 13 can be set according to the thickness of the membrane to be prepared.

[0118] Therefore, through this process step, the electrode sheet that needs to be thinned can be thinned.

[0119] The technical solution of this application is further illustrated below through a specific embodiment.

[0120] As shown in FIG. 1 and FIG. 2 , the scrap material outlet device 100 includes a scrap material transfer wheel 111 , a rotating shaft 112 and a scraper 121 .

[0121] The edge material transfer wheel 111 is sleeved on the rotating shaft 112, and both ends of the rotating shaft 112 are connected to the fixed mounting plate 131. In this embodiment, there are two edge material transfer wheels 111. The edge material transfer wheel 111 includes a sleeve with an embedded key block, and the rotating shaft 112 includes a key groove. The sleeve with the embedded key block and the key groove together constitute a first displacement mechanism. As the key block on the sleeve slides in the key groove on the rotating shaft 112, the edge material transfer wheel 111 slides horizontally on the rotating shaft 112. On both sides of each edge material transfer wheel 111, a limit block 113 is provided adjacent to the edge material transfer wheel 111. The limit block 113 will lock the edge material transfer wheel 111 in position on the rotating shaft 112 to prevent the edge material transfer wheel 111 from sliding horizontally on the rotating shaft 112 during the preparation of the electrode sheet 20, thereby affecting the edge material extraction quality.

[0122] The scraper 121 is in contact with the surface of the scrap transfer wheel 111, completely scraping off all scrap material from the surface of the scrap transfer wheel 111, preventing the scrap material from squeezing the normal film area and forming defective electrode sheets, thereby reducing product quality and yield. In this embodiment, the scraper scraping unit also includes a scraper mounting upper pressure plate 122 and a scraper mounting lower support plate 123. The inner surface of the scraper mounting upper pressure plate 122 is milled with a groove of a certain depth. The scraper 121 is clamped between the scraper mounting upper pressure plate 122 and the scraper mounting lower support plate 123 and tightened with bolts, thereby defining the placement of the scraper 121.

[0123] The fixed mounting assembly includes a pair of fixed mounting plates 131, and the roller pressing system 10 includes a roller pressing mechanism mounting frame. The fixed mounting plates 131 define the maximum width of the edge material guide device 100. The distance between the two fixed mounting plates 131 is greater than the width of the untrimmed film sheet and can be adjusted based on the specific film width and number of film sections. To integrate the edge material guide device 100 into the roller pressing system 10, the two fixed mounting plates 131 are bolted to the roller pressing mechanism mounting frame. Once installed, the rotating shaft 112 is parallel to the axial direction of the film pressing roller 13. In this embodiment, the rolling system 10 also includes an intermediate fixed mounting plate 132 and a bottom fixed mounting plate 133. The intermediate fixed mounting plate 132 is arranged in the middle position of the rotating shaft 112 and has an embedded bearing structure. The bottom fixed mounting plate 133 is arranged at the bottom position of the fixed mounting plate 131. The fixed mounting plate 131, the bottom fixed mounting plate 133 and the intermediate fixed mounting plate 132 are tightened with bolts, which together serve the purpose of stabilizing the entire set of edge material outlet device 100.

[0124] The drive motor, specifically a servo drive motor 145, drives the scrap transfer wheel 111. In this embodiment, the roller pressing system 10 also includes a sealed bearing 141, a slide cylinder 142, a synchronous pulley 143, and a drive belt 144. The sealed bearing 141 is mounted on the fixed mounting plate 131 for mounting the rotating shaft 112. To reduce rotational resistance, a sealed bearing 141 may also be installed on the intermediate fixed mounting plate 132. The slide cylinder 142 controls the distance and degree of contact between the scrap discharge device 100 and the surface of the diaphragm pressing roller 13 by opening and closing an air pressure valve. Slide cylinders 142 can also be installed at both ends of the scrap discharge device 100 to increase stability during up and down movement. The drive motor drives the synchronous pulley 143 via a drive belt 144. Two scrap transfer wheels 111 are coaxially arranged on either side of the synchronous pulley 143. Thus, the drive motor indirectly drives the two scrap transfer wheels 111 via the drive belt 144.

[0125] As shown in FIG3 , the roller pressing system 10 includes a support roller 11 , a first pressing roller 12 , a film pressing roller 13 , a third pressing roller 14 , a trimming device 15 and a scrap material outlet device 100 .

[0126] The first pressing roller 12, the membrane pressing roller 13, and the third pressing roller 14 are arranged sequentially in the membrane conveying direction. The widths of the first pressing roller 12, the membrane pressing roller 13, and the third pressing roller 14 can be adjusted based on the maximum width of the membrane or fibrous material to be pressed. Furthermore, the diameters of the first pressing roller 12, the membrane pressing roller 13, and the third pressing roller 14 affect the relative linear speeds at the surfaces of adjacent rollers. Therefore, the diameters of the first pressing roller 12, the membrane pressing roller 13, and the third pressing roller 14 can be determined based on different electrode sheet preparation requirements. To prevent deformation of the first pressing roller 12, a support roller 11 is provided outside it.

[0127] The trimming device 15 is positioned below the first pressure roller 12. To remove the scrap from the film pressure roller 13, a scrap deflection device 100 is positioned downstream of the trimming device 15. The rotating shaft 112 of the scrap deflection device 100 is parallel to that of the film pressure roller 13, ensuring that the scrap on the film pressure roller 13 can contact the surface of the scrap deflection wheel 111 across its entire width. The scrap is then completely transferred to the surface of the scrap deflection wheel 111 under the force exerted by the wheel.

[0128] During the operation of the rolling system 10, the extruded thick film or fiberized material is squeezed against each other by the first pressing roller 12 and the film pressing roller 13 to obtain a thinned film of a certain shape and thickness. Because the edges of the film after calendering and thinning have irregular wavy edges, a cutter mechanism and a side material guide device are installed on the fixed frame below the film pressing roller 13. The cutter cuts off the side materials on both sides, and the side material guide device 100 then guides the side materials out to achieve the edge shaping of the film. The shaped film adheres to the surface of the film pressing roller 13, and is compounded with the current collector under the rolling action of the film pressing roller 13 and the third pressing roller. The formed electrode sheet is moved to the oven with the third pressing roller to remove the solvent and then rolled up, or it can be directly rolled up.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A scrap material outlet device (100), comprising: A rotating shaft (112); A scrap transfer wheel (111), the scrap transfer wheel (111) is sleeved on the rotating shaft (112) and is configured to engage with a film pressing roller so as to transfer the scrap of the film from the film pressing roller to the wheel surface of the scrap transfer wheel (111); A scraper (121), wherein the scraper (121) is configured to fit the wheel surface of the edge material transfer wheel (111) so as to scrape off the film edge material transferred to the wheel surface of the edge material transfer wheel (111).

2. The edge material outlet device (100) according to claim 1, wherein: The edge material guide device (100) further comprises a first displacement mechanism, wherein the first displacement mechanism is configured to adjust the axial positioning of the edge material transfer wheel (111) on the rotating shaft (112).

3. The edge material outlet device (100) according to claim 2, wherein: The circumferential surface of the rotating shaft (112) is provided with one of a keyway and a key block. The first displacement mechanism comprises: a sleeve, the sleeve being coaxially arranged with the edge material transfer wheel (111) and being located at the center of the edge material transfer wheel (111); the other of the keyway and the key block, the other of the keyway and the key block being disposed on the inner surface of the sleeve; At least one limit block (113), the at least one limit block (113) being arranged on the circumferential surface of the rotating shaft (112) and being used for limiting the axial movement of the edge material transfer wheel (111).

4. The edge material discharge device (100) according to any one of claims 1 to 3, wherein: It also comprises a second displacement mechanism, which is configured to adjust the positioning of the wheel surface of the edge material transfer wheel (111) relative to the membrane pressing roller.

5. The edge material outlet device (100) according to claim 4, wherein: The second displacement mechanism comprises a slide cylinder (142) or a hydraulic lift.

6. The edge material discharge device (100) according to any one of claims 1 to 5, wherein: It also includes a pair of fixed installation plates (131), wherein the fixed installation plates (131) are respectively connected to two ends of the rotating shaft (112).

7. The edge material discharge device (100) according to any one of claims 1 to 6, wherein: The invention also comprises a driving motor (145), wherein the driving motor (145) is configured to drive the edge material transfer wheel (111) to rotate.

8. The edge material outlet device (100) according to claim 7, wherein: The edge material outlet device (100) comprises a plurality of edge material transfer wheels (111), and the plurality of edge material transfer wheels (111) are arranged at intervals along the axial direction of the rotating shaft (112).

9. The edge material outlet device (100) according to claim 8, wherein: It also includes a transmission belt (144) and a synchronous wheel (143), wherein the transmission belt (144) connects the drive motor and the synchronous wheel (143), and the synchronous wheel (143) and the plurality of edge material transfer wheels (111) are sleeved on the rotating shaft (112).

10. The edge material outlet device (100) according to claim 8, wherein: The scrap material outlet device (100) comprises a plurality of drive motors, and the plurality of drive motors are configured to respectively drive the plurality of scrap material transfer wheels (111) to rotate.

11. The edge material discharge device (100) according to any one of claims 8 to 10, wherein: The width of the scraper (121) is greater than the distance between the outer edges of the two outermost edge material transfer wheels among the plurality of edge material transfer wheels (111).

12. The edge material discharge device (100) according to any one of claims 8 to 10, wherein: The scrap material outlet device (100) comprises a plurality of scrapers (121), and the plurality of scrapers (121) are configured to fit respectively with the wheel surfaces of the plurality of scrap material transfer wheels (111).

13. The edge material discharge device (100) according to any one of claims 1 to 12, wherein: The ratio of the diameter of the edge material transfer wheel (111) to the diameter of the membrane pressing roller is 1:2 to 1:20, and the width of the wheel surface of the edge material transfer wheel (111) is 10 millimeters (mm) to 800 millimeters (mm).

14. The edge material discharge device (100) according to any one of claims 1 to 13, wherein: The material of the edge material transfer wheel (111) is a natural polymer material or a synthetic polymer material.

15. The edge material outlet device (100) according to claim 14, wherein: The material of the edge material transfer wheel (111) is silicone rubber.

16. A roller pressing system (10), comprising: A film pressing roller (13), wherein the film pressing roller (13) is configured to convey the film; A trimming device (15), wherein the trimming device (15) is configured to cut the film into a film to be formed and film edge material; According to the edge material guide device (100) according to any one of claims 1 to 15, the edge material guide device (100) is located downstream of the edge trimming device (15) in the conveying direction of the film.

17. The roller pressing system (10) according to claim 16, wherein: Also includes: a first pressing roller (12) configured to engage with the film pressing roller (13) and located upstream of the trimming device (15) in the conveying direction of the film; The second pressing roller (14) is configured to engage with the film pressing roller (13) and is located downstream of the edge material guide device (100) in the conveying direction of the film.

18. The roller pressing system (10) according to claim 16 or 17, wherein: The edge trimming device (15) comprises a cutter, the position and number of which match the position and number of the edge material transfer wheels (111).

19. A method (500) for preparing an electrode sheet (20) using a rolling system (10) according to any one of claims 16 to 18, comprising: conveying (520) the membrane by means of the membrane pressing roller (13); The membrane is cut (530) into membranes to be formed and membrane edge material by the trimming device (15); The film scrap is transferred (540) from the film pressing roller (13) to the wheel surface of the scrap transfer wheel (111) by the scrap transfer wheel (111) of the scrap outlet device (100); The membrane to be formed is transported (550) to a downstream through the membrane pressing roller (13) to be combined with a current collector to obtain the electrode sheet (20).

20. The method according to claim 19, wherein: The step of conveying the membrane by the membrane pressing roller (13) comprises: The membrane is passed between the membrane pressing roller (13) and the first pressing roller (12) so as to be thinned (510) by the pressing of the membrane pressing roller (13) and the first pressing roller (12).

Images