Rolling system

Abstract

The utility model relates to a rolling system, which comprises a first stretching device, a second stretching device, a third stretching device and a fourth stretching device, the first calendaring mechanism comprises a first calendaring roller and a first calendaring wheel, a first calendaring gap for a pole piece to pass through is formed between the first calendaring wheel and the first calendaring roller, and the first calendaring wheel and the first calendaring roller are matched for calendaring a tab area of the pole piece; the pole piece is calendered by the first calendering mechanism and then is stretched by the stretching mechanism; the rolling device is arranged at the downstream of the first stretching device; and the pole piece is stretched by the stretching mechanism and then enters the rolling device to be rolled. The tab area and the coating area are respectively extended, so that the extension difference of the tab area and the coating area in the rolling process of the pole piece is reduced, the internal stress of the pole piece is reduced, wrinkles are reduced, and the risk of belt breakage of the pole piece is reduced. Teflon does not need to be attached to the stretching mechanism, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to a roller pressing system. Background Art

[0002] In the manufacturing process of lithium batteries, the manufacture of pole pieces is an important part. In the manufacturing process of pole pieces, after the coating process is completed, a rolling process is required to compact the coated pole pieces so that the pole pieces reach a suitable density and thickness. Among them, the rolling process generally includes a stretching process and a rolling process. After the pole pieces are stretched and extended in the stretching process, they enter the rolling process for rolling, and finally obtain a suitable pole piece density and thickness.

[0003] However, the pole piece includes a coating area and a lug area, and there is a thickness difference between the lug area and the coating area. During the stretching and rolling process of the pole piece, the coating area will fit the roller, while the lug area will be in a suspended state. As a result, the coating area will have a greater degree of extension after stretching or rolling, while the lug area will have a smaller degree of extension. Therefore, due to the different degrees of extension, the coating area and the lug area have internal stress and wrinkles, which can easily lead to the occurrence of pole piece breakage.

[0004] In traditional technology, in order to reduce the occurrence of pole piece breakage, Teflon is often pasted on the stretching roller. Teflon is in contact with the pole piece's lug area. The pole piece's coating area is stretched while the lug area is stretched, so that the coating area and the lug area are stretched evenly. However, pasting Teflon is time-consuming and laborious; at the same time, after the pole piece is stretched by pasting Teflon, the pole lug area is not stretched enough, and there is still residual stress in the pole piece, so the pole piece breakage phenomenon is still easy to occur. Utility Model Content

[0005] Based on this, it is necessary to provide a rolling system that reduces the risk of pole piece breakage in order to address the problem that the rolling process in traditional technology is prone to cause pole piece breakage.

[0006] A roller pressing system, comprising:

[0007] A first stretching device, comprising a first calendering mechanism and a stretching mechanism, wherein the stretching mechanism is located downstream of the first calendering mechanism; the first calendering mechanism comprises a first calendering roller and a first calendering wheel, a first calendering gap for the pole piece to pass through is formed between the first calendering wheel and the first calendering roller, and the two cooperate to calender the pole ear area of ​​the pole piece; after the pole piece is calendered by the first calendering mechanism, it is stretched by the stretching mechanism;

[0008] A rolling device is arranged downstream of the first stretching device; after being stretched by the stretching mechanism, the pole piece enters the rolling device for rolling.

[0009] In the above-mentioned rolling system, before the pole piece is stretched by the stretching mechanism and rolled by the rolling device, it is first rolled by the first rolling mechanism. After being rolled by the first rolling mechanism, the pole piece's lug area is extended, and when stretched by the stretching mechanism and rolled by the rolling device, the coating area of ​​the pole piece is extended. Since the pole piece lug area and the coating area are extended respectively, the difference in the extension of the pole piece lug area and the coating area in the rolling process is reduced, thereby reducing the stress inside the pole piece, reducing wrinkles, and reducing the risk of the pole piece breaking. At the same time, compared with the method of stretching the pole piece lug area by affixing Teflon in the prior art, the stretching mechanism in the embodiment of the present application no longer needs to stick Teflon, which saves time and effort; and, after the pole piece's lug area is rolled, the pole piece is stretched and rolled by the stretching mechanism and the rolling device, which can effectively eliminate the stress inside the pole piece, thereby reducing the frequency of breaking.

[0010] In one embodiment, the first calendering mechanism further includes a support roller, and the support roller and the first calendering roller are arranged on the same side of the pole piece to support the first calendering roller.

[0011] In one embodiment, the centers of the support roller, the first calendering roller and the first calendering wheel are located on the same straight line; and / or

[0012] The diameter of the supporting roller is larger than the diameter of the first calendering roller.

[0013] In one embodiment, the first calendering mechanism further includes a first driving member, and the first calendering wheel is connected to the first driving member;

[0014] The first driving member is used to drive the first calendering wheel to approach or move away from the first calendering roller, so as to adjust the size of the first calendering gap.

[0015] In one embodiment, the first stretching device also includes a second calendering mechanism, which is located upstream of the first calendering mechanism; the second calendering mechanism includes a second calendering roller and a second calendering wheel, and a second calendering gap for the pole piece to pass through is formed between the second calendering wheel and the second calendering roller, and the two cooperate to calender the pole ear area of ​​the pole piece.

[0016] In one embodiment, the second calendering mechanism further includes a second driving member, and the second calendering wheel is connected to the second driving member;

[0017] The second driving member is used to drive the second calendering wheel to approach or move away from the second calendering roller, so as to adjust the size of the second calendering gap.

[0018] In one embodiment, the second calendering wheel is a rubber wheel.

[0019] In one of the embodiments, the stretching mechanism comprises a floating roller, and the floating roller is capable of floating to stretch the pole piece.

[0020] In one embodiment, the first stretching device also includes an adjusting mechanism, which includes a height-adjusting roller arranged upstream and / or downstream of the first calendering mechanism, and the height-adjusting roller is used to adjust the feeding angle of the pole piece input into the first calendering gap and / or the discharging angle of the pole piece output from the first calendering gap.

[0021] In one of the embodiments, the rolling system further includes a second stretching device, which is disposed downstream of the rolling device and is used to stretch the pole piece after being rolled by the rolling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 A schematic structural diagram of a rolling system provided in one embodiment of the present application.

[0024] Description of reference numerals:

[0025] 1000, rolling system; 100, first stretching device; 10, first calendering mechanism; 11, first calendering roller; 12, first calendering wheel; 13, first calendering gap; 14, support roller; 15, first driving member; 20, stretching mechanism; 21, floating roller; 30, second calendering mechanism; 31, second calendering roller; 32, second calendering wheel; 33, second calendering gap; 41, height adjustment roller; 51, driving roller; 200, rolling device; 201, first pressing roller; 202, second pressing roller; 203, rolling gap; 2000, pole piece. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "size", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0032] See also Figure 1 In one embodiment of the present application, a rolling system 1000 is provided for calendering, stretching and rolling a pole piece 2000 to obtain a suitable pole piece density and pole piece thickness. In some specific implementations, the pole piece 2000 is a positive pole piece.

[0033] The rolling system 1000 includes a first stretching device 100 and a rolling device 200, wherein the rolling device 200 is disposed downstream of the first stretching device 100. The first stretching device 100 includes a first calendering mechanism 10 and a stretching mechanism 20, wherein the stretching mechanism 20 is disposed downstream of the first calendering mechanism 10, and the rolling device 200 is disposed downstream of the stretching mechanism 20. The first calendering mechanism 10 is used to calender the pole piece 2000, the stretching mechanism 20 is used to stretch the pole piece 2000, and the rolling device 200 is used to roll the pole piece 2000.

[0034] Optionally, the rolling system 1000 further includes an unwinding device (not shown in the figure), which is arranged upstream of the first stretching device 100 and is used for unwinding the pole piece. After being unwinded by the unwinding device, the pole piece enters the first stretching device 100.

[0035] Continue reading Figure 1The first calendering mechanism 10 includes a first calendering roller 11 and a first calendering wheel 12, and a first calendering gap 13 is formed between the first calendering wheel 12 and the first calendering roller 11. The pole lug area (the area on the surface of the foil material not coated with slurry) of the pole piece 2000 can pass through the first calendering gap 13, and the first calendering wheel 12 cooperates with the second calendering roller 31 to calender the pole lug area of ​​the pole piece 2000. Specifically, the first calendering wheel 12 and the second calendering roller 31 rotate in opposite directions to cooperate in calendering the pole lug area of ​​the pole piece 2000. When the pole piece 2000 passes through the first calendering mechanism 10, its pole lug area is extended. After being calendered by the first calendering mechanism 10, the pole piece 2000 arrives at the stretching mechanism 20, and the stretching mechanism 20 can stretch the pole piece 2000 so that the coating area (the area on the surface of the foil material coated with slurry) of the pole piece 2000 is extended. The pole piece 2000 stretched by the stretching mechanism 20 enters the rolling device 200, and the rolling device 200 performs rolling thinning on the pole piece 2000. Optionally, the rolling device 200 includes a first pressing roller 201 and a second pressing roller 202, and a rolling gap 203 is formed between the first pressing roller 201 and the second pressing roller 202. The stretched pole piece 2000 is rolled thinned by the first pressing roller 201 and the second pressing roller 202 through the rolling gap 203.

[0036] It should be noted that when the pole piece 2000 passes through the first calendering mechanism 10, only the pole lug area of ​​the pole piece 2000 passes through the first calendering gap 13 for calendering, and at this time, the first calendering wheel 12 will not directly apply a force to the coating area of ​​the pole piece 2000. When the pole piece 2000 passes through the stretching mechanism 20, the stretching mechanism 20 directly applies a force to the coating area of ​​the pole piece 2000. When the pole piece 2000 passes through the rolling device 200, the rolling device 200 directly applies a force to the coating area of ​​the pole piece 2000. However, since the coating area is connected to the pole lug area, regardless of whether a force is directly applied to the pole lug area or the coating area, the area that is not directly subjected to the force will also be stretched to a certain extent under the pulling of the area that is directly subjected to the force, but the degree of stretching is weaker than that of the area that is directly subjected to the force.

[0037] In the rolling system 1000 provided in the embodiment of the present application, before the pole piece 2000 is stretched by the stretching mechanism 20 and before being rolled by the rolling device 200, it is first rolled by the first rolling mechanism 10. After being rolled by the first rolling mechanism 10, the pole ear area of ​​the pole piece 2000 is extended, and when stretched by the stretching mechanism 20 and rolled by the rolling device 200, the coating area of ​​the pole piece 2000 is extended. Since the pole ear area and the coating area are extended respectively, the difference in the extension of the pole ear area and the coating area of ​​the pole piece 2000 in the rolling process is reduced, thereby reducing the stress inside the pole piece 2000, reducing wrinkles, and reducing the risk of the pole piece 2000 breaking. At the same time, compared with the method of sticking Teflon to stretch the pole ear area in the prior art, the stretching mechanism 20 in the embodiment of the present application no longer needs to stick Teflon, which saves time and effort; and, after the pole ear area of ​​the pole piece 2000 is calendered, the pole piece 2000 is stretched and rolled by the stretching mechanism 20 and the rolling device 200, which can effectively eliminate the internal stress of the pole piece 2000, thereby reducing the frequency of tape breaks.

[0038] Further reading Figure 1 The first calendering mechanism 10 also includes a support roller 14, which is arranged on the same side of the pole piece 2000 as the first calendering roller 11, so as to support the first calendering roller 11 to prevent the first calendering roller 11 from being deformed or shifted when subjected to a large force, thereby ensuring the calendering accuracy.

[0039] Optionally, the centers of the support roller 14, the first calendering roller 11 and the first calendering wheel 12 are located on the same straight line, and in this case, the support roller 14, the first calendering roller 11 and the first calendering wheel 12 are directly opposite in the extension direction of the straight line. In this way, when the first calendering wheel 12 applies a force to the first calendering roller 11 through the pole piece 2000 in the extension direction of the straight line, the support roller 14 can directly support the first calendering roller 11, thereby ensuring the supporting effect.

[0040] Furthermore, the diameter of the support roller 14 is greater than the diameter of the first calendering roller 11 , which further ensures the supporting effect of the support roller 14 on the first calendering roller 11 .

[0041] In some embodiments, the first calendering mechanism 10 includes a plurality of first calendering wheels 12, which are sequentially arranged along the axial direction of the first calendering roller 11, and a first calendering gap 13 is formed between each first calendering wheel 12 and the first calendering roller 11. In this way, when the pole piece 2000 has a plurality of pole lug regions in the width direction (a direction parallel to the axial direction of the first calendering roller 11), each pole lug region passes through a first calendering gap 13, so that the plurality of pole lug regions can be calendered simultaneously.

[0042] In some specific embodiments, the first calendering mechanism 10 includes two first calendering wheels 12, so that two first calendering gaps 13 are formed between the two first calendering wheels 12 and the first calendering roller 11, and the pole piece 2000 is adapted to have two pole ear regions. In some other specific embodiments, the number of first calendering wheels 12 included in the first calendering mechanism 10 is not limited and can be selected according to working conditions. For example, the first calendering mechanism 10 can also be set to include one, three, or more than three first calendering wheels 12.

[0043] Continue reading Figure 1 , the first calendering mechanism 10 also includes a first driving member 15, and the first calendering wheel 12 is connected to the first driving member 15. The first driving member 15 is used to drive the first calendering wheel 12 to approach or move away from the first calendering roller 11, so as to adjust the size of the first calendering gap 13. The first driving member 15 drives the first calendering wheel 12 to approach or move away from the first calendering roller 11, and can adjust the spacing between the first calendering wheel 12 and the first calendering roller 11, thereby adjusting the size of the first calendering gap 13. That is, the force applied by the first calendering wheel 12 to the pole piece 2000 can be adjusted (when the first calendering gap 13 is smaller, the force applied by the first calendering wheel 12 to the pole piece 2000 is greater) to meet the extension requirements for pole ear areas of different thicknesses. Specifically, the first driving member 15 is an oil cylinder.

[0044] In some embodiments, see Figure 1 The first stretching device 100 also includes a second calendering mechanism 30, which is located upstream of the first calendering mechanism 10. The second calendering mechanism 30 includes a second calendering roller 31 and a second calendering wheel 32. A second calendering gap 33 is formed between the second calendering wheel 32 for the pole piece 2000 to pass through, and the two cooperate to calender the pole lug area of ​​the pole piece 2000. Optionally, the second calendering gap 33 is larger than the first calendering gap 13. Before the pole lug area of ​​the pole piece 2000 enters the first calendering mechanism 10, it first passes through the second calendering gap 33 of the second calendering mechanism 30. When the pole lug area passes through the second calendering gap 33, the second calendering wheel 32 cooperates with the second calendering roller 31 to calender the pole lug area, so that the pole lug area of ​​the pole piece 2000 is extended. In this way, before entering the stretching mechanism 20, the pole piece 2000 has its ear area rolled twice by the second rolling mechanism 30 and the first rolling mechanism 10. The latter rolling can reduce the residual stress generated by the previous rolling, thereby ensuring that the pole piece 2000 has a better stretching effect when passing through the stretching mechanism 20.

[0045] Optionally, the number of second calendering wheels 32 included in the second calendering mechanism 30 is equal to the number of first calendering wheels 12, and the first calendering wheels 12 and the second calendering wheels 32 are arranged one by one in the length direction of the pole piece 2000. In this way, multiple pole lug regions of the pole piece 2000 can be calendered.

[0046] Furthermore, the second calendering wheel 32 is a rubber wheel, which is relatively soft and can avoid damaging the tab area of ​​the electrode piece 2000 .

[0047] The second calendering mechanism 30 also includes a second driving member, and the second calendering wheel 32 is connected to the second driving member. The second driving member is used to drive the second calendering wheel 32 to approach or move away from the second calendering roller 31, so as to adjust the size of the second calendering gap 33. The second driving member drives the second calendering wheel 32 to approach or move away from the second calendering roller 31, and can adjust the spacing between the second calendering wheel 32 and the second calendering roller 31, thereby adjusting the size of the second calendering gap 33. That is, the force applied by the second calendering wheel 32 to the pole piece 2000 can be adjusted to meet the extension requirements for the pole ear area of ​​different thicknesses.

[0048] Specifically, the second driving member is a cylinder. Since the pressure provided by the oil cylinder as the first driving member 15 is greater than the pressure provided by the cylinder as the second driving member, the first calendering gap 13 can be made smaller than the second calendering gap 33. It is conceivable that in some other embodiments, the types of the first driving member 15 and the second driving member are not limited, such as the first driving member 15 and the second driving member can also be motors, etc.

[0049] In some embodiments, the first stretching device 100 further includes an adjustment mechanism, and the adjustment mechanism includes a height-adjusting roller 41. A height-adjusting roller 41 is provided upstream and / or downstream of the first calendering mechanism 10, and the height-adjusting roller 41 is used to adjust the feeding angle of the pole piece 2000 input into the first calendering gap 13 and / or the discharging angle of the pole piece 2000 output from the first calendering gap 13. In some specific embodiments, height-adjusting rollers 41 are provided upstream and downstream of the first calendering mechanism 10, and the cooperation of the upstream and downstream height-adjusting rollers 41 can enable the pole piece 2000 to output horizontally and output the first calendering gap 13 horizontally.

[0050] In some embodiments, see Figure 1 The stretching mechanism 20 includes a floating roller 21, and the floating roller 21 can float and stretch the pole piece 2000. Specifically, a driving roller 51 is provided between the first calendering mechanism 10 and the floating roller 21. The pole piece 2000 is input to the driving roller 51 after being calendered by the first calendering mechanism 10. The driving roller 51 separates the tension between the upstream and downstream, and the pole piece 2000 is stretched by floating stretching by the floating roller 21.

[0051] Furthermore, the rolling system 1000 further includes a second stretching device (not shown in the figure), which is disposed downstream of the rolling device 200 to stretch the pole piece 2000 after being rolled by the rolling device 200. When the pole piece 2000 is stretched and extended by the second stretching device, a suitable density and thickness of the pole piece 2000 can be obtained.

[0052] In some embodiments, the rolling system 1000 further includes a winding device (not shown in the figure), which is arranged downstream of the second stretching device and is useful for winding up the pole piece stretched by the second stretching device. It is conceivable that in some other embodiments, the rolling system 1000 may also omit the second stretching device and the winding device, which is not limited here.

[0053] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A roller pressing system, characterized in that: include: A first stretching device (100) comprises a first calendering mechanism (10) and a stretching mechanism (20), wherein the stretching mechanism (20) is located downstream of the first calendering mechanism (10); the first calendering mechanism (10) comprises a first calendering roller (11) and a first calendering wheel (12), a first calendering gap (13) for the pole piece (2000) to pass through is formed between the first calendering wheel (12) and the first calendering roller (11), and the two cooperate to calender the pole ear region of the pole piece (2000); after being calendered by the first calendering mechanism (10), the pole piece (2000) is stretched by the stretching mechanism (20); A rolling device (200) is arranged downstream of the first stretching device (100); after being stretched by the stretching mechanism (20), the pole piece (2000) enters the rolling device (200) for rolling.

2. The roller pressing system according to claim 1, characterized in that: The first calendering mechanism (10) further comprises a supporting roller (14), wherein the supporting roller (14) and the first calendering roller (11) are arranged on the same side of the pole piece (2000) for supporting the first calendering roller (11).

3. The roller pressing system according to claim 2, characterized in that: The centers of the supporting roller (14), the first calendering roller (11) and the first calendering wheel (12) are located on the same straight line; and / or The diameter of the support roller (14) is greater than the diameter of the first calendering roller (11).

4. The roller pressing system according to claim 1, characterized in that: The first calendering mechanism (10) further comprises a first driving member (15), and the first calendering wheel (12) is connected to the first driving member (15); The first driving member (15) is used to drive the first calendering wheel (12) to move closer to or farther away from the first calendering roller (11), so as to adjust the size of the first calendering gap (13).

5. The roller pressing system according to claim 1, characterized in that: The first stretching device (100) further includes a second calendering mechanism (30), which is located upstream of the first calendering mechanism (10); the second calendering mechanism (30) includes a second calendering roller (31) and a second calendering wheel (32), and a second calendering gap (33) for the pole piece (2000) to pass through is formed between the second calendering wheel (32) and the second calendering roller (31), and the two cooperate to calender the pole ear area of ​​the pole piece (2000).

6. The roller pressing system according to claim 5, characterized in that: The second calendering mechanism (30) further comprises a second driving member, and the second calendering wheel (32) is connected to the second driving member; The second driving member is used to drive the second calendering wheel (32) to move closer to or away from the second calendering roller (31), so as to adjust the size of the second calendering gap (33).

7. The roller pressing system according to claim 5, characterized in that: The second calendering wheel (32) is a rubber wheel.

8. The roller pressing system according to claim 1, characterized in that: The stretching mechanism (20) comprises a floating roller (21), and the floating roller (21) is capable of floating to stretch the pole piece (2000).

9. The roller pressing system according to claim 1, characterized in that: The first stretching device (100) also includes an adjustment mechanism, which includes a height adjustment roller (41) arranged upstream and / or downstream of the first calendering mechanism (10), and the height adjustment roller (41) is used to adjust the feeding angle of the pole piece (2000) input into the first calendering gap (13) and / or the discharging angle of the pole piece (2000) output from the first calendering gap (13).

10. The roller pressing system according to claim 1, characterized in that: The rolling system further comprises a second stretching device, which is arranged downstream of the rolling device (200) and is used to stretch the pole piece (2000) after being rolled by the rolling device (200).

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