Rolling device

Abstract

The application relates to the technical field of battery production, and provides a rolling device. According to the rolling device, after a first pole piece is transported to a slitting mechanism by a unwinding mechanism, each of a plurality of slitting assemblies of the slitting mechanism slits a second pole piece with a predetermined width from the first pole piece, and then each slitting assembly is provided with a rolling mechanism, and each second pole piece is rolled by the corresponding rolling mechanism, so that the edge cracking and belt breaking of the wide strip pole piece in the prior art when directly rolled can be avoided to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a rolling device. Background Technology

[0002] Since the successful application of lithium batteries in the 1990s, lithium-ion battery technology has developed rapidly. Due to its high energy density, long cycle life, and wide operating temperature range, it is widely used in consumer electronics, electric vehicles, and energy storage power stations.

[0003] In the application of lithium-ion batteries in electric vehicles, lithium-ion batteries, as the most expensive component in electric vehicles, have become the main focus of all mainstream automakers. The most important cell electrode in the battery is directly related to the performance of the vehicle.

[0004] Currently, coated electrodes are becoming increasingly wider. Previously, single-strip electrodes were narrower and lighter. In order to improve range and reduce costs, the width of single-strip electrodes has been further increased, resulting in a further increase in the width of multi-strip electrodes.

[0005] Therefore, wide-width zebra thick electrodes are the industry trend. Currently, common rolling mills are only suitable for narrow-width, low-compact density electrodes. When rolling wide-width zebra electrodes, due to the poor consistency of the incoming plate material, the difference in the extension between the blank area and the material area during rolling is too large, causing frequent strip breakage. At the same time, high-density electrodes require rollers with greater pressure, and the extension between electrode materials is more intense, making edge cracking and strip breakage more serious. The original rolling process and rolling equipment can no longer meet the new requirements. Utility Model Content

[0006] In view of this, this application provides a roller pressing device, which aims to solve the above-mentioned technical problems to a certain extent.

[0007] This application provides a roller pressing device, the roller pressing device comprising: An unwinding mechanism, wherein the unwinding mechanism is used to unwind the first electrode sheet; A slitting mechanism is provided in which the first electrode sheet is conveyed from the unwinding mechanism to the slitting mechanism along the conveying direction. The slitting mechanism is located downstream of the unwinding mechanism in the conveying direction. The slitting mechanism includes a plurality of slitting components, which are used to slit out a second electrode sheet of a predetermined width from the first electrode sheet. Multiple rolling mechanisms are provided, each corresponding to one of the multiple slitting components. The rolling mechanism is located downstream of the corresponding slitting component in the conveying direction. The rolling mechanism is used to roll the second electrode sheet cut out by the corresponding slitting component. Multiple winding mechanisms are provided, each corresponding to one of the multiple pressing mechanisms. The winding mechanism is located downstream of the corresponding pressing mechanism in the conveying direction. The winding mechanism is used to wind up the second electrode sheet after it has been pressed by the corresponding pressing mechanism.

[0008] Based on the above technical solutions, optionally, the unwinding mechanism includes an unwinding shaft, the unwinding shaft having an unwinding section for winding the first electrode sheet, the extension direction of the unwinding shaft being a first axial direction, and the dimension of the unwinding section in the first axial direction being greater than or equal to 1000 mm. The winding mechanism includes a winding shaft having a winding section for winding the second electrode sheet, the winding shaft extending in a second axial direction, and the winding section having a dimension greater than or equal to 300 mm in the second axial direction.

[0009] Based on the above technical solutions, optionally, the plurality of slitting components are arranged at intervals along the conveying direction, and the slitting component located on the upstream side slits the first electrode sheet before the slitting component located on the downstream side.

[0010] Based on the above technical solutions, optionally, the plurality of slitting components are arranged along a direction perpendicular to the conveying direction, and the plurality of slitting components simultaneously slit the first electrode sheet.

[0011] Based on the above technical solutions, optionally, the rolling mechanism can apply a rolling pressure to the second electrode sheet such that the compaction density of the second electrode sheet after rolling is greater than or equal to 2.6 g / cm³.

[0012] Based on the above technical solutions, optionally, the first electrode includes an electrode body and a slurry coated on the electrode body, and the rolling device includes: The detection mechanism is located outside the unwinding mechanism and is used to detect the outer surface of the first electrode to obtain a detection signal. The control mechanism is communicatively connected to the detection mechanism and to the plurality of rolling mechanisms. The control mechanism receives the detection signal and identifies the slurry coating status on the outer side of the electrode body based on the detection signal. The control mechanism characterizes poor slurry coating based on the slurry coating status and controls the rolling mechanism to reduce the rolling speed.

[0013] Based on the above technical solutions, optionally, the detection mechanism includes a detection element and a support, the detection element is disposed on the support, the support is connected to the first side of the unwinding mechanism, the first electrode is unwound outward from the second side of the unwinding mechanism, and the first side and the second side are opposite to each other.

[0014] Based on the above technical solutions, optionally, the detection element includes an image recognition element, which is used to acquire the detection signal of the image of the outer surface of the first electrode.

[0015] Based on the above technical solutions, optionally, the bracket is connected to the upper side of the unwinding mechanism, and the first electrode is unwound from the lower side of the unwinding mechanism.

[0016] Based on the above technical solutions, optionally, the slitting mechanism includes at least three slitting blades, each slitting blade having a cutting edge for slitting the first electrode sheet, the cutting edge having an angle of 30 degrees with the vertical direction.

[0017] According to the rolling device provided in this application, after the unwinding mechanism conveys the first electrode sheet to the slitting mechanism, each of the multiple slitting components of the slitting mechanism cuts out a second electrode sheet of a predetermined width from the first electrode sheet. Subsequently, since each slitting component is equipped with a rolling mechanism, each second electrode sheet is rolled by the corresponding rolling mechanism, thereby avoiding to some extent the edge cracking and strip breakage that occur when directly rolling wide strip electrode sheets in the prior art.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a three-dimensional view of a roller pressing device provided according to an embodiment of this application is shown.

[0021] Figure 2 A schematic diagram of a two-dimensional rolling device provided according to an embodiment of this application is shown.

[0022] Figure label: 100 - Unwinding mechanism; 110 - Unwinding shaft; 20 - Slitting mechanism; 200 - Slitting assembly; 210 - Slitting blade; 300-Roller pressing mechanism; 400 - Receiving mechanism; 500 - Testing organization; 510 - Testing element; 520 - Support; 610 - First electrode; 620 - Second electrode; X - Conveying direction. Detailed Implementation

[0023] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0027] According to an embodiment of this application, a roller pressing device is provided, which will be described below in conjunction with... Figure 1 and Figure 2 Describe in detail the structure and working principle of the roller pressing device.

[0028] According to the embodiments of this application, the roller pressing device includes an unwinding mechanism 100, a slitting mechanism 20, and a plurality of roller pressing mechanisms 300.

[0029] In an embodiment, the unwinding mechanism 100 is used to unwind the first electrode sheet 610, which is conveyed from the unwinding mechanism 100 to the slitting mechanism 20 along the conveying direction X. The slitting mechanism 20 is located downstream of the unwinding mechanism 100 in the conveying direction X. The slitting mechanism 20 includes a plurality of slitting components 200, which are used to cut a second electrode sheet 620 of a predetermined width from the first electrode sheet 610.

[0030] In the embodiment, multiple rolling mechanisms 300 are arranged in a one-to-one correspondence with multiple slitting components 200. The rolling mechanism 300 is arranged on the downstream side of the corresponding slitting component 200 in the conveying direction X. The rolling mechanism 300 is used to roll the second electrode sheet 620 cut out by the corresponding slitting component 200.

[0031] Thus, according to the rolling device provided in the embodiments of this application, after the unwinding mechanism 100 conveys the first electrode sheet 610 to the slitting mechanism 20, each of the plurality of slitting components 200 of the slitting mechanism 20 cuts out a second electrode sheet 620 of a predetermined width from the first electrode sheet 610. Subsequently, since each slitting component 200 is provided with a rolling mechanism 300, each second electrode sheet 620 is rolled by the corresponding rolling mechanism 300, thereby avoiding to some extent the edge cracking and strip breakage that occur when directly rolling wide strip electrode sheets in the prior art.

[0032] In an embodiment, as an example, the first electrode 610 may be, for example, a wider zebra electrode, and the second electrode 620 may be a narrower electrode cut from the first electrode 610.

[0033] According to the rolling device provided in the embodiments of this application, the rolling device may further include a plurality of winding mechanisms 400. The plurality of winding mechanisms 400 may be provided in a one-to-one correspondence with the plurality of rolling mechanisms 300. The winding mechanism 400 may be provided on the downstream side of the corresponding rolling mechanism 300 in the conveying direction X, and is used to wind up the second electrode sheet 620 after being rolled by the corresponding rolling mechanism 300.

[0034] Thus, according to the rolling device provided in the embodiments of this application, a corresponding winding mechanism 400 is provided for each rolled second electrode sheet 620, so that after the second electrode sheet 620 is rolled, the second electrode sheet 620 can be directly stored on the corresponding winding mechanism 400, thereby reducing the external tension borne by the rolled second electrode sheet 620 and ensuring the quality of the rolled second electrode sheet 620.

[0035] In this embodiment, the unwinding mechanism 100 and the winding mechanism 400 are basically the same as existing unwinding and winding structures. For example, the unwinding mechanism 100 includes an unwinding shaft 110 for winding the first electrode 610, and the winding mechanism 400 includes a winding shaft for winding the second electrode 620. The first electrode 610 is wound around the outside of the unwinding shaft 110, and the second electrode 620 is wound around the outside of the winding shaft. The structures of the unwinding mechanism 100 and the winding mechanism 400 will be described in detail below.

[0036] According to the rolling apparatus provided in the embodiments of this application, as mentioned above, the unwinding mechanism 100 may include an unwinding shaft 110, which may have an unwinding section for winding the first electrode sheet 610. The extension direction of the unwinding shaft 110 is a first axial direction, and the dimension of the unwinding section in the first axial direction is greater than or equal to 1000 mm. Therefore, according to the rolling apparatus provided in the embodiments of this application, since the unwinding section has a dimension greater than or equal to 1000 mm in the first axial direction, the unwinding section can wind a first electrode sheet 610 with a width greater than or equal to 1000 mm.

[0037] According to the roller pressing apparatus provided in the embodiments of this application, as mentioned above, the winding mechanism 400 includes a winding shaft, which may have a winding section for winding the second electrode sheet 620. The winding shaft extends in a second axial direction, and the dimension of the winding section in the second axial direction is greater than or equal to 300 mm. Therefore, according to the roller pressing apparatus provided in the embodiments of this application, since the winding section has a dimension greater than or equal to 300 mm in the second axial direction, the unwinding section can wind a first electrode sheet 610 with a width greater than or equal to 300 mm.

[0038] According to the rolling device provided in the embodiments of this application, as an example, the width of the second electrode 620 can be, for example, 350 mm, and the first electrode 610 can be cut twice to form three second electrode 620s. Therefore, the width of the first electrode 610 can be, for example, 1050 mm.

[0039] According to the roller pressing device provided in the embodiments of this application, the above-mentioned multiple slitting components 200 are arranged at intervals along the conveying direction X, and the slitting component 200 located on the upstream side slits the first electrode 610 before the slitting component 200 located on the downstream side.

[0040] Thus, according to the rolling device provided in the embodiments of this application, multiple slitting components 200 can be arranged in the conveying direction X, thereby forming a sequential order in the slitting sequence. That is, multiple slitting components 200 can be arranged at intervals in the conveying direction X. Specifically, each slitting component 200 performs one slitting operation on the electrode sheet currently conveyed to it, dividing the electrode sheet currently conveyed to it into two pieces, at least one of which is a second electrode sheet 620.

[0041] In this embodiment, whether both of the two electrode sheets after slitting are the second electrode sheet 620 depends on the order of the slitting assemblies 200. Specifically, the two electrode sheets slitted by the slitting assembly 200 closest to the unwinding mechanism 100, that is, the first slitting assembly 200 in the conveying direction X, will have one as the second electrode sheet 620 as described above, and the other as an electrode sheet wider than the second electrode sheet 620. Therefore, in essence, all the slitting assemblies 200 located before the last slitting assembly 200 in the conveying direction X will slit out two electrode sheets, one of which will be the second electrode sheet 620, and the other will be an electrode sheet wider than the second electrode sheet 620.

[0042] Based on the above description, the last slitting component 200 slits the electrode currently fed to the slitting component 200 into two electrode sheets. Since it is the last slitting, the two electrode sheets that are slit out are actually the second electrode sheet 620.

[0043] like Figure 1 and Figure 2 As shown, Figure 1 A three-dimensional view of the roller pressing apparatus provided according to an embodiment of this application is shown. Figure 2 exist Figure 1 A plan view is provided based on this. For example, the slitting component 200 can be two, meaning the first electrode 610 is slitted twice to create three second electrodes 620. However, it should be noted that... Figure 1 and Figure 2 Only one slitting component 200 is shown. This slitting component 200 is the first slitting component 200. The second slitting component 200 is omitted to make the orientation of the electrode clearer, but the orientation of the two electrodes after the second slitting is still retained.

[0044] According to the roller pressing device provided in the embodiments of this application, combined with Figure 1 and Figure 2 The structure of the unwinding mechanism 100, the winding mechanism 400, and the rolling mechanism 300 will be briefly explained in further detail.

[0045] In the embodiment, as mentioned in the above description, the unwinding mechanism 100 has an unwinding shaft 110 and two supports for supporting the unwinding shaft 110. As an example, both supports may be provided with bearing seats, and the two ends of the unwinding shaft 110 may be respectively disposed in the corresponding bearing seats via bearings so as to rotate relative to the two supports.

[0046] In an embodiment, the unwinding mechanism 100 may also include an unwinding motor, such as a servo motor, that drives the unwinding shaft 110 to rotate. This servo motor may be connected to one end of the unwinding shaft 110 via a coupling structure such as a coupling, thereby transmitting power to the unwinding shaft 110. In practical applications, the servo motor can drive the unwinding shaft 110 to rotate, winding the first electrode sheet 610 onto the unwinding shaft 110 for subsequent slitting. Simultaneously, the servo motor can also drive the unwinding shaft 110 to rotate during slitting by the rolling device, thereby unwinding the first electrode sheet 610. As an example, the unwinding motor may be integrated into a support on the side where the motor is located.

[0047] Similarly, the structure of the winding mechanism 400 can be set with reference to the unwinding mechanism 100, that is, it has a support, a bearing housing, a bearing and a winding motor. In addition, since the width of the second pole piece 620 is smaller than that of the first pole piece 610, for the winding mechanism 400, the support can be set only on one side of the winding shaft.

[0048] In this embodiment, the rolling mechanism 300 can also utilize an existing rolling structure. Its main structure may include two rolls, which may be spaced apart in the height direction. These rolls can be rotated using the aforementioned supports, bearing seats, and bearings. The slit second electrode sheet 620 passes between the two rolls to be rolled. As an example, synchronous pulleys may be provided on the same side of both rolls. One synchronous pulley can be driven by a motor as the driving pulley, and the two synchronous pulleys are connected by a synchronous belt drive, making the other synchronous pulley a driven pulley.

[0049] In addition, it should be noted that the first axial direction of the unwinding shaft 110, the second axial direction of the winding shaft, and the axial direction of the rolls of the rolling mechanism 300 mentioned above can be parallel, and they can all be perpendicular to the conveying direction X.

[0050] According to the roller pressing device provided in the embodiments of this application, in some other examples not shown, the aforementioned multiple slitting components can also be arranged along a direction perpendicular to the conveying direction X, and the aforementioned multiple slitting components can simultaneously slit the first electrode sheet. In this example, the aforementioned multiple slitting components are arranged at the same position in the conveying direction X, and simultaneously slit the first electrode sheet in the same number as the number of slitting components, thereby helping to reduce the footprint of the roller pressing device in the conveying direction X. Conversely, Figure 1 and Figure 2 In the example of the rolling device, since the slitting assembly 200 cuts sequentially, sufficient space can be provided for the rolling mechanism 300 and the winding mechanism 400 for each cut second electrode 620, which is more advantageous for cutting the wider first electrode 610.

[0051] According to the rolling apparatus provided in the embodiments of this application, the rolling mechanism 300 can apply a rolling pressure to the second electrode 620 such that the compacted density of the second electrode 620 after rolling is greater than or equal to 2.6 g / cm³. Therefore, the second electrode 620 can obtain the aforementioned compaction after rolling, which is beneficial to ensuring the rolling quality of the second electrode 620.

[0052] According to the rolling device provided in the embodiments of this application, the first electrode 610 includes an electrode body and a slurry coated on the electrode body. The rolling device may also include a detection mechanism 500 and a control mechanism.

[0053] In this embodiment, the detection mechanism 500 may be disposed on the outside of the unwinding mechanism 100. The detection mechanism 500 may be used to detect the outer surface of the first electrode 610 to obtain a detection signal.

[0054] In this embodiment, the control mechanism can be communicatively connected to the detection mechanism 500 and can also be communicatively connected to the multiple rolling mechanisms 300 mentioned above. The control mechanism can receive detection signals and identify the slurry coating status on the outer side of the electrode body based on the detection signals. The control mechanism can characterize poor slurry coating based on the slurry coating status and control the rolling mechanism 300 to reduce the rolling speed.

[0055] Thus, according to the rolling device provided in the embodiments of this application, the term "poor slurry coating" includes, for example, the presence of empty foil material in the first electrode 610, i.e., a section of the first electrode 610 is not coated with slurry and only has the electrode body. When the detection mechanism 500 detects that the foil surface has not been coated with slurry, the detection signal is transmitted to the control mechanism, which controls the rolling mill to decelerate, preventing the second electrode 620 from suddenly breaking due to a sudden change in thickness when passing through the 302 roll.

[0056] As an example, the detection unit 500 can be, for instance, a CCD camera.

[0057] According to the rolling device provided in the embodiments of this application, the detection mechanism 500 may include a detection element 510 and a bracket 520. The detection element 510 (i.e., a CCD camera) is disposed on the bracket 520. The bracket 520 is connected to the first side (e.g., the upper side) of the unwinding mechanism 100. The first electrode 610 is unwound outward from the second side (e.g., the lower side) of the unwinding mechanism 100. The first side and the second side are opposite to each other.

[0058] In the embodiment, according to the features described above, the detection mechanism 500 is opposite to the unwinding side. That is, the first electrode 610 detected by the detection mechanism 500 is still in the winding state and has not been unwound. This is beneficial because when the detection mechanism 500 detects a position with poor coating, there is enough time to feed back to the control mechanism and give the control mechanism enough time to control the roller pressing mechanism 300 to decelerate, thereby reducing the distance that the part of the first electrode 610 with poor coating is conveyed along the conveying direction X.

[0059] According to the rolling device provided in the embodiments of this application, the detection element 510 may include an image recognition element, such as the CCD camera mentioned above, and may also be provided with an image recognition element that provides video, such as a camera.

[0060] According to the roller pressing device provided in the embodiments of this application, the slitting mechanism 20 may include at least three slitting blades 210. The slitting blades 210 may be, for example, existing slitting blades 210, which will not be described in detail here. The slitting blades 210 have a cutting edge for slitting the first electrode 610. Here, the angle between the cutting edge and the vertical direction is 30 degrees, which reduces the risk of powder falling off and burrs appearing at the edge of the film area when the electrode is cut.

[0061] According to the rolling device provided in the embodiments of this application, the process path is that the wide first electrode 610 is first cut into multiple narrow second electrode 620s. Each segment of narrow second electrode 620 is rolled and then wound up independently. This avoids the wide, high-pressure dense first electrode 610 from stretching to both sides of the film area and causing wrinkles in the blank area when rolled under high pressure, which could lead to tape breakage during rolling. Rolling a single strip of second electrode 620 effectively reduces the risk of wrinkling in the blank area and enables high-speed rolling mass production.

[0062] According to the rolling device provided in the embodiments of this application, the high-density second electrode sheet 620 after slitting is rolled by a three-section independent rolling mechanism 300, so as to realize the rolling and winding of multiple strip electrode sheets and achieve higher production efficiency.

[0063] According to the roller pressing device provided in the embodiments of this application, by detecting coating abnormalities in the incoming first electrode 610, the roller pressing speed is controlled to reduce the risk of roller pressing breakage caused by abnormalities in the incoming first electrode 610.

[0064] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A roller pressing device, characterized in that, The roller pressing device has a conveying direction, and the roller pressing device includes: Unwinding mechanism (100) for unwinding the first electrode sheet (610); A slitting mechanism (20) is provided, wherein the first electrode sheet (610) is conveyed from the unwinding mechanism (100) to the slitting mechanism (20) along the conveying direction (X), the slitting mechanism (20) is disposed downstream of the unwinding mechanism (100) in the conveying direction (X), and the slitting mechanism (20) includes a plurality of slitting components (200) for slitting a second electrode sheet (620) of a predetermined width from the first electrode sheet (610). Multiple rolling mechanisms (300) are provided, each corresponding to one of the multiple slitting components (200). The rolling mechanism (300) is located downstream of the corresponding slitting component (200) in the conveying direction (X). The rolling mechanism (300) is used to roll the second electrode sheet (620) cut out by the corresponding slitting component (200). Multiple winding mechanisms (400) are provided, each corresponding to one of the multiple pressing mechanisms (300). The winding mechanism (400) is located downstream of the corresponding pressing mechanism (300) in the conveying direction (X). The winding mechanism (400) is used to wind up the second electrode sheet (620) after it has been pressed by the corresponding pressing mechanism (300).

2. The roller pressing device according to claim 1, characterized in that, The unwinding mechanism (100) includes an unwinding shaft (110) having an unwinding section for winding the first electrode sheet (610). The unwinding shaft (110) extends in a first axial direction, and the dimension of the unwinding section in the first axial direction is greater than or equal to 1000 mm. The winding mechanism (400) includes a winding shaft having a winding section for winding the second electrode (620), the winding shaft extending in a second axial direction, and the winding section having a dimension in the second axial direction greater than or equal to 300 mm.

3. The roller pressing device according to claim 1, characterized in that, The plurality of slitting components (200) are arranged at intervals along the conveying direction (X), and the slitting component (200) located on the upstream side slits the first electrode (610) before the slitting component (200) located on the downstream side.

4. The roller pressing device according to claim 1, characterized in that, The plurality of slitting components (200) are arranged along a direction perpendicular to the conveying direction (X), and the plurality of slitting components (200) simultaneously slit the first electrode (610).

5. The roller pressing device according to any one of claims 1 to 4, characterized in that, The rolling mechanism (300) can apply a rolling pressure to the second electrode (620) such that the compaction density of the rolled second electrode (620) is greater than or equal to 2.6 g / cm³.

6. The roller pressing device according to any one of claims 1 to 4, characterized in that, The first electrode (610) includes an electrode body and a slurry coated on the electrode body, and the rolling device includes: The detection mechanism (500) is disposed on the outside of the unwinding mechanism (100) and is used to detect the outer surface of the first electrode (610) to obtain a detection signal. The control mechanism is communicatively connected to the detection mechanism (500) and to the plurality of rolling mechanisms (300). The control mechanism receives the detection signal and identifies the slurry coating status on the outer side of the electrode body based on the detection signal. The control mechanism characterizes poor slurry coating based on the slurry coating status and controls the rolling mechanism (300) to reduce the rolling speed.

7. The roller pressing device according to claim 6, characterized in that, The detection mechanism (500) includes a detection element (510) and a support (520). The detection element (510) is disposed on the support (520). The support (520) is connected to the first side of the unwinding mechanism (100). The first electrode (610) is unwound outward from the second side of the unwinding mechanism (100). The first side and the second side are opposite to each other.

8. The roller pressing device according to claim 7, characterized in that, The detection element (510) includes an image recognition element, which is used to acquire a detection signal of an image of the outer surface of the first electrode (610).

9. The roller pressing device according to claim 7, characterized in that, The bracket (520) is connected to the upper side of the unwinding mechanism (100), and the first electrode (610) is unwound outward from the lower side of the unwinding mechanism (100).

10. The roller pressing device according to any one of claims 1 to 4, characterized in that, The slitting mechanism (20) includes at least three slitting blades (210), each slitting blade (210) having a cutting edge for slitting the first electrode (610), the cutting edge having an angle of 30 degrees with the vertical direction.

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