Pole piece compacting device

Abstract

The application relates to a kind of pole piece compaction devices, including first compression roller, second compression roller and support roller, and the pole piece to be compacted can pass through first roller nip and second roller nip.Pole piece when passing through first roller nip, the region corresponding to first compaction part is compacted under the joint action of first compaction part and support roller, while the region corresponding to first avoidance part is not compacted due to being suspended on first roller surface.Pole piece when passing through second roller nip, the compacted region corresponds to second avoidance part, avoiding secondary roller pressing, while the uncompacted region can be compacted under the joint action of second compaction part and support roller.It can be seen that first compression roller and second compression roller cooperate with support roller to compact one half of pole piece respectively, so the area of single compaction is reduced by half, and the pressure required for roller pressing is also reduced accordingly.Therefore, the deformation degree of first compression roller and second compression roller in the compaction process can be significantly reduced, thereby improving the uniformity of the compacted pole piece.

Description

Technical Field

[0001] This invention relates to the field of lithium battery equipment technology, and in particular to an electrode compaction device. Background Technology

[0002] In the production process of lithium-ion battery cells, the coated electrode sheets need to be compacted to increase their density, thereby improving the energy density of the cell. Currently, two opposing rollers are typically used to compact the electrode sheets. The electrode sheet to be compacted passes between the two rollers, with opposing pressure applied to each roller. Under the rolling pressure of the two rollers, the electrode sheet is compacted.

[0003] As the electrode sheet is compacted, it also exerts a reaction force on the upper and lower rollers. Moreover, when the compaction density of the electrode sheet is high, the reaction force of the electrode sheet on the rollers will also increase accordingly, which may cause the rollers to bend and deform during the compaction process. The deformed rollers arch in the middle, resulting in the rolled electrode sheet being thicker in the middle and thinner at the edges, indicating uneven compaction. Summary of the Invention

[0004] Therefore, it is necessary to provide an electrode compaction device that can improve the uniformity of the compacted electrode to address the above problems.

[0005] An electrode compaction device, comprising:

[0006] The first pressure roller has a first compacted part and a first voided part evenly distributed on its first roller pressing surface, and the first compacted part and the first voided part each occupy half of the surface area of ​​the first roller pressing surface.

[0007] The second pressure roller has a second compaction section and a second clearance section evenly distributed on its second pressure surface, and the second compaction section and the second clearance section each occupy half of the surface area of ​​the second pressure surface; and

[0008] A support roller is disposed between the first pressure roller and the second pressure roller, and is able to form a first roller gap and a second roller gap with the first pressure roller and the second pressure roller respectively;

[0009] The electrode sheet can pass through the first roller gap and the second roller gap in sequence. When the electrode sheet passes through the first roller gap, it corresponds to the area of ​​the first compacted part and the first void part. When it passes through the second roller gap, it corresponds to the second void part and the second compacted part, respectively.

[0010] In one embodiment, the rotation axes of the first pressure roller, the second pressure roller, and the support roller are parallel to each other and located in the same plane.

[0011] In one embodiment, the outer diameter of the support roller is smaller than the outer diameters of the first pressure roller and the second pressure roller.

[0012] In one embodiment, the first pressure roller and the second pressure roller are axially symmetrical about the axis of rotation of the support roller.

[0013] In one embodiment, a first spiral groove is formed on the first roller surface, the area corresponding to the first spiral groove forms the first clearance portion, and the area outside the first spiral groove forms the first compaction portion.

[0014] A second spiral groove is formed on the second roller surface, the area corresponding to the second spiral groove forms the second clearance part, and the area outside the second spiral groove forms the second compaction part.

[0015] In one embodiment, the first spiral groove is provided in multiple ways, and the two ends of each first spiral groove extend to the opposite two sides of the first roller pressing surface, and the area between two adjacent first spiral grooves forms the first compaction part.

[0016] The second spiral groove is provided in multiple ways, and the two ends of each second spiral groove extend to the opposite two sides of the second roller pressing surface, and the area between two adjacent second spiral grooves forms the second compaction part.

[0017] In one embodiment, a plurality of first annular grooves are provided on the first roller surface at equal intervals along the axial direction of the first roller. Each first annular groove extends circumferentially along the first roller. The area corresponding to the first annular groove forms the first clearance portion, and the area outside the first annular groove forms the first compaction portion.

[0018] The second roller surface is provided with a plurality of second annular grooves that are equally spaced along the axial direction of the second roller. Each second annular groove extends circumferentially along the second roller. The area corresponding to the second annular groove forms the second clearance portion, and the area outside the second annular groove forms the second compaction portion.

[0019] In one embodiment, a roller passing assembly is also included, wherein the electrode sheet between the first roller gap and the second roller gap can pass through the roller passing assembly, and the roller passing assembly can move relative to the support roller to adjust the length of the electrode sheet between the first roller gap and the second roller gap.

[0020] In one embodiment, the roller assembly includes a first roller and a second roller, the electrode sheet can pass through the first roller and the second roller in sequence, and the entry point of the electrode sheet with the first roller is aligned with the first roller gap, and the exit point of the electrode sheet with the second roller is aligned with the second roller gap.

[0021] In one embodiment, a drive assembly is further included, which is capable of driving the first pressure roller and the second pressure roller to rotate in the same direction, and is capable of driving the support roller to rotate in the opposite direction relative to the first pressure roller and the second pressure roller.

[0022] The aforementioned electrode compaction device allows the electrode to be compacted to pass sequentially through a first roller gap and a second roller gap. When the electrode passes through the first roller gap, the area corresponding to the first compaction section is compacted under the combined action of the first compaction section and the support roller, while the area corresponding to the first clearance section remains uncompacted because it is suspended above the first roller surface. When the electrode passes through the second roller gap, the compacted area corresponds to the second clearance section, avoiding secondary roller compaction, while the uncompacted area is compacted under the combined action of the second compaction section and the support roller. Therefore, the first and second rollers, in conjunction with the support roller, can each compact half of the electrode, thus reducing the area compacted in a single pass by half and correspondingly reducing the pressure required for roller compaction. Consequently, the deformation of the first and second rollers during the compaction process can be significantly reduced, thereby improving the uniformity of the compacted electrode. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view of the electrode compaction device in a preferred embodiment of the present invention;

[0025] Figure 2 for Figure 1 The left side view of the electrode compaction device shown;

[0026] Figure 3 for Figure 2 The electrode compaction device shown is a cross-sectional view along AA.

[0027] Figure 4 for Figure 2 The diagram shows the unfolded electrode plate between points B and C.

[0028] Figure 5 for Figure 1A schematic diagram of the structure of the first pressure roller in the electrode compaction device shown;

[0029] Figure 6 for Figure 1 The diagram shows the structure of the second pressure roller in the electrode compaction device. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 invention 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 invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Please see Figure 1 , Figure 2 and Figure 3 In a preferred embodiment of the present invention, the electrode compaction device 10 includes a first pressure roller 100, a second pressure roller 200, and a support roller 300.

[0037] The first pressure roller 100 is generally formed from a metal material with high strength and hardness, and the straightness of its first roller pressing surface is within 0.005 mm / m. A first compacted portion 110 and a first clearance portion 120 are evenly distributed on the first roller pressing surface of the first pressure roller 100. Furthermore, the first compacted portion 110 and the first clearance portion 120 each occupy half of the surface area of ​​the first roller pressing surface. The height of the first compacted portion 110 is greater than that of the first clearance portion 120, and the first clearance portion 120 is recessed towards the center of the first pressure roller 100 compared to the first compacted portion 110. Specifically, the first clearance portion 120 can be formed by creating grooves in the first roller pressing surface, while the ungrooved area forms the first compacted portion 110.

[0038] The second pressing surface of the second pressure roller 200 has a second compaction portion 210 and a second clearance portion 220 evenly distributed. Furthermore, the second compaction portion 210 and the second clearance portion 220 each occupy half of the surface area of ​​the second pressing surface. The material and structure of the second pressure roller 200 can be the same as those of the first pressure roller 100; therefore, the specific forms of the second compaction portion 210 and the second clearance portion 220 can be the same as those of the first compaction portion 110 and the first clearance portion 120.

[0039] A support roller 300 is disposed between the first pressure roller 100 and the second pressure roller 200. The support roller 300 is a circular roller with a smooth surface. Typically, the first pressure roller 100 and the second pressure roller 200 are spaced apart in the vertical direction. Specifically, in this embodiment, the first pressure roller 100 is located below, and the second pressure roller 200 is located above. Obviously, in other embodiments, the positions of the first pressure roller 100 and the second pressure roller 200 can be interchanged.

[0040] The first pressure roller 100, the second pressure roller 200, and the support roller 300 can all rotate around their own rotation axes. Specifically, the electrode compaction device 10 generally also includes a frame, a large plate, and other supporting structures (not shown in the figure). The first pressure roller 100, the second pressure roller 200, and the support roller 300 can be rotatably mounted on the aforementioned supporting structures via bearings. Furthermore, the support roller 300 can form a first roller gap (not shown in the figure) with the first pressure roller 1000 and a second roller gap (not shown in the figure) with the second pressure roller 200. The electrode 20 to be compacted can pass through the first roller gap and the second roller gap in sequence, thereby being compacted under the cooperation of the first pressure roller 100, the second pressure roller 200, and the support roller 300.

[0041] During the compaction operation of the electrode sheet 20, the first pressure roller 100 and the second pressure roller 200 can rotate in the same direction, while the support roller 300 rotates in the opposite direction to the first pressure roller 100 and the second pressure roller 200, thereby achieving roller pressing of the electrode sheet 20 passing through the first roller pressing gap and the second roller pressing gap. When the first pressure roller 100 and the second pressure roller 200 rotate clockwise, the support roller 300 rotates counterclockwise; and when the first pressure roller 100 and the second pressure roller 200 rotate counterclockwise, the support roller 300 rotates clockwise.

[0042] Specifically, in this embodiment, the electrode compaction device 10 further includes a driving component (not shown in the figure), which can drive the first pressure roller 100 and the second pressure roller 200 to rotate in the same direction, and can drive the support roller 300 to rotate in the opposite direction relative to the first pressure roller 100 and the second pressure roller 200.

[0043] The drive assembly may include multiple motors, and the first pressure roller 100, the second pressure roller 200, and the support roller 300 may each be driven by a separate motor. Since the support roller 300 can actively rotate under the drive of the drive assembly, its rotational speed (linear velocity) can be kept consistent with that of the first pressure roller 100 and the second pressure roller 200. Therefore, slippage of the electrode sheet 20 relative to the support roller 300 within the first and second roller gaps can be effectively prevented.

[0044] Furthermore, in this embodiment, the rotation axes of the first pressure roller 100, the second pressure roller 200, and the support roller 300 are parallel to each other and located in the same plane. During the compaction operation of the electrode 20, pressure directed towards the support roller 300 is applied to the journals of the first pressure roller 100 and the second pressure roller 200, respectively. When the rotation axes of the first pressure roller 100, the second pressure roller 200, and the support roller 300 are located in the same plane, the pressures applied to the first pressure roller 100 and the second pressure roller 200 cancel each other out on the support roller 300, thereby helping to maintain the positional stability of the support roller 300 and the entire electrode compaction device 10.

[0045] Furthermore, in this embodiment, the outer diameter of the support roller 300 is smaller than the outer diameters of the first pressure roller 100 and the second pressure roller 200. This reduces the space occupied by the electrode compaction device 10 and increases the operating space on both sides of the first and second roller gaps.

[0046] like Figure 2 As shown, the point where the electrode 20 cuts out with the first pressure roller 100 is denoted as point B, and the point where the electrode 20 cuts into the second pressure roller 200 is denoted as point C. That is, after passing through the gap between the first and second pressure rollers, the electrode 20 cuts out at point B and enters the gap between the second and second pressure rollers at point C. Specifically, the area corresponding to the first compacted portion 110 and the first clearance portion 120 when the electrode 20 passes through the first pressure roller gap corresponds to the second clearance portion 220 and the second compacted portion 210, respectively, when passing through the second pressure roller gap. The first clearance portion 120 and the second clearance portion 220 do not contact the electrode 20, therefore, the areas corresponding to the first clearance portion 120 and the second clearance portion 220 cannot be compacted. In other words, the compacted areas of the electrode 20 are different when it passes through the first and second pressure roller gaps, respectively.

[0047] Specifically, such as Figure 4 As shown, when the electrode 20 passes through the gap of the first roller, the area corresponding to the first compaction part 110 is compacted under the combined action of the first compaction part 110 and the support roller 300, thus forming a compacted area 21; while the area corresponding to the first clearance part 120 is not compacted because it is suspended on the first roller surface, thus forming an uncompacted area 22. Since the first compaction part 110 and the first clearance part 120 each occupy half of the surface area of ​​the first roller surface, the compacted area 21 and the uncompacted area 22 also each occupy half of the surface area of ​​the electrode 20.

[0048] When the electrode 20 passes through the gap between the second rollers, the compacted area 21 corresponds to the second clearance portion 220, while the uncompacted area 22 corresponds to the second compacted portion 210. The second clearance portion 220 allows the compacted area 21 of the electrode 20 to be suspended on the second roller surface, thus avoiding secondary roller pressing of the compacted area 21; while the uncompacted area 22 can be compacted under the combined action of the second compacted portion 210 and the support roller 300. Therefore, during the compaction operation of the electrode 20, one half of the electrode 20 can be compacted first by the cooperation of the first pressure roller 100 and the support roller 300, and then the other half can be compacted by the cooperation of the second pressure roller 200 and the support roller 300. In this way, the area of ​​the electrode 20 compacted in a single operation is reduced by half, and the pressure required for roller pressing is correspondingly reduced. Therefore, the pressure that the first pressure roller 100 and the second pressure roller 200 need to apply to the electrode 20 can be significantly reduced, and the reaction force of the electrode 20 acting on the first pressure roller 100 and the second pressure roller 200 is also reduced accordingly. Thus, the degree of deformation of the first pressure roller 100 and the second pressure roller 200 during the compaction process can be reduced, thereby improving the uniformity of the electrode 20 after compaction.

[0049] It should be noted that the outer diameter of the support roller 300, the relative angle between the first pressure roller 100 and the second pressure roller 200, and the distance between points B and C can be set so that when the electrode 20 passes through the second roller gap, its compacted area 21 and uncompacted area 22 can correspond exactly to the second clearance portion 220 and the second compacted portion 210, respectively.

[0050] Please refer to it again. Figure 2 In this embodiment, the electrode compaction device 10 further includes a roller assembly 400, the electrode 20 between the first roller gap and the second roller gap can pass around the roller assembly 400, and the roller assembly 400 can move relative to the support roller 300 to adjust the length of the electrode 20 between the first roller gap and the second roller gap.

[0051] The electrode 20 between the first and second roller gaps refers to the electrode between point B and point C. When the size of the electrode 20 changes, the roller assembly 400 can adjust the length of this part of the electrode 20 so that the compacted area 21 and the uncompacted area 22 of the electrode 20 passing through the second roller gap can correspond to the second clearance portion 220 and the second compacted portion 210, respectively. This eliminates the need to replace the support rollers 300 with different outer diameters or adjust the relative angle between the first pressure roller 100 and the second pressure roller 200, making adjustment more convenient.

[0052] Furthermore, in this embodiment, the roller assembly 400 includes a first roller 410 and a second roller 420, and the electrode sheet can pass through the first roller 410 and the second roller 420 in sequence. The entry point of the electrode sheet 20 with the first roller 410 is aligned with the first roller gap, and the exit point of the electrode sheet 20 with the second roller 420 is aligned with the second roller gap.

[0053] Specifically, the point of contact between the electrode 20 and the first roller 410 refers to the lowest point of the first roller 410, denoted as point D; while the point of contact between the electrode 20 and the second roller 420 refers to the highest point of the second roller 420, denoted as point E. Thus, when the electrode 20 passes through the gap between the first and second rollers, it will be tangent to the support roller 300, thereby reducing the wrap angle of the electrode 20 on the support roller 300, and thus reducing the contact area between the electrode 20 and the support roller 300. This prevents excessive friction on the surface of the electrode 20 during rotation by the support roller 300, thus preventing powder from falling off the electrode 20.

[0054] Furthermore, in this embodiment, the first pressure roller 100 and the second pressure roller 200 are axially symmetrically distributed with respect to the rotation axis of the support roller 300. Thus, during the compaction operation of the electrode sheet 20, the first pressure roller 100, the support roller 300, and the second pressure roller 200 can all maintain a good force balance, thereby avoiding uneven local wear caused by force imbalance among the first pressure roller 100, the support roller 300, and the second pressure roller 200.

[0055] Please refer to the following: Figure 5 In this embodiment, a first spiral groove 101 is formed on the first roller pressing surface, a first clearance portion 120 is formed in the area corresponding to the first spiral groove 101, and a first compaction portion 110 is formed in the area outside the first spiral groove 101.

[0056] The first clearance portion 120 formed by the first spiral groove 101 is spiral-shaped, so the first compaction portion 110 is also spiral-shaped. When the electrode 20 passes through the gap between the first rollers, the electrode 20 is clamped between the first compaction portion 110 and the support roller 300. As the first pressure roller 100 and the support roller 300 rotate, the first compaction portion 110 can cooperate with the surface of the support roller 300 to press the electrode 20, thereby compacting it. Since the first compaction portion 110 is spiral-shaped, its contact position with the support roller 300 will also change in real time as the first pressure roller 100 rotates. In this way, the worn part of the support roller 300 (the position in contact with the first compaction portion 110) also changes accordingly, thereby ensuring that the surface of the support roller 300 wears evenly during long-term production, avoiding the occurrence of electrode 20 thickness differences and surface appearance defects due to uneven wear of the support roller 300.

[0057] Furthermore, in this embodiment, multiple first spiral grooves 101 are provided, with each first spiral groove 101 extending to the opposite edges of the first roller pressing surface at both ends. The area between two adjacent first spiral grooves 101 forms a first compaction portion 110. Each first spiral groove 101 is relatively short and does not wrap around the first pressure roller 100 once. In this way, the formed first compaction portion 110 and first clearance portion 120 can be more evenly distributed on the first roller pressing surface.

[0058] Please refer to the following: Figure 6 In this embodiment, a second spiral groove 201 is formed on the second roller surface. The area corresponding to the second spiral groove 201 forms a second clearance portion 220, and the area outside the second spiral groove 201 forms a second compaction portion 210. Furthermore, multiple second spiral grooves 201 are provided, with both ends of each second spiral groove 201 extending to opposite edges of the second roller surface. The area between two adjacent second spiral grooves 201 forms a second compaction portion 210. The structure of the second pressure roller 200 is the same as that of the first pressure roller 100, and therefore will not be described further.

[0059] Other methods can also be used to form the first compacted portion 210 and the first clearance portion 220 on the first roller pressing surface. For example, in another embodiment, a plurality of first annular grooves (not shown) are provided on the first roller pressing surface at equal intervals along the axial direction of the first pressure roller 100. Each first annular groove extends circumferentially along the first pressure roller 100. The area corresponding to the first annular groove forms the first clearance portion 120, and the area outside the first annular groove forms the first compacted portion 110.

[0060] Correspondingly, a plurality of second annular grooves are provided on the second roller surface, which are equally spaced along the axial direction of the second roller 200. Each second annular groove extends circumferentially along the second roller 200. The area corresponding to the second annular groove forms a second clearance portion 220, and the area outside the second annular groove forms a second compaction portion 210.

[0061] At this time, the first pressure roller 100 and the second pressure roller 200 need to be staggered along the axial direction, and the gaps between the first annular groove and the two adjacent second annular grooves of the second roller pressing surface should be aligned, while the gaps between the second annular groove and the two adjacent first annular grooves of the first roller pressing surface should be aligned.

[0062] The aforementioned electrode compaction device 10 allows the electrode 20 to be compacted to pass sequentially through the first roller gap and the second roller gap. When the electrode 20 passes through the first roller gap, the area corresponding to the first compaction section 110 is compacted under the combined action of the first compaction section 110 and the support roller 300, while the area corresponding to the first clearance section 120 is not compacted because it is suspended on the first roller surface. When the electrode 20 passes through the second roller gap, the compacted area corresponds to the second clearance section 220, avoiding secondary roller compaction, while the uncompacted area can be compacted under the combined action of the second compaction section 210 and the support roller 300. It can be seen that the first pressure roller 100 and the second pressure roller 200, in cooperation with the support roller 300, can compact half of the electrode 20 respectively, thus reducing the area compacted in a single operation by half, and the pressure required for roller compaction is also reduced accordingly. Therefore, the deformation of the first pressure roller 100 and the second pressure roller 200 during the compaction process can be significantly reduced, thereby improving the uniformity of the electrode sheet 20 after compaction.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An electrode compaction device, characterized in that, include: The first pressure roller has a first compacted part and a first voided part evenly distributed on its first roller pressing surface, and the first compacted part and the first voided part each occupy half of the surface area of ​​the first roller pressing surface. The second pressure roller has a second compaction section and a second clearance section evenly distributed on its second pressure surface, and the second compaction section and the second clearance section each occupy half of the surface area of ​​the second pressure surface; and A support roller is disposed between the first pressure roller and the second pressure roller, and is able to form a first roller gap and a second roller gap with the first pressure roller and the second pressure roller respectively; The electrode sheet can pass through the first roller gap and the second roller gap in sequence. When the electrode sheet passes through the first roller gap, it corresponds to the area of ​​the first compacted part and the first clearance part. When it passes through the second roller gap, it corresponds to the second clearance part and the second compacted part, respectively. A first spiral groove is formed on the first roller surface. The area corresponding to the first spiral groove forms the first clearance part, and the area outside the first spiral groove forms the first compacted part. A second spiral groove is formed on the second roller surface. The area corresponding to the second spiral groove forms the second clearance part, and the area outside the second spiral groove forms the second compacted part. The rotation axes of the first pressure roller, the second pressure roller, and the support roller are parallel to each other and located in the same plane.

2. The electrode compaction device according to claim 1, characterized in that, The outer diameter of the support roller is smaller than the outer diameters of the first pressure roller and the second pressure roller.

3. The electrode compaction device according to claim 1, characterized in that, The first pressure roller and the second pressure roller are axially symmetrical about each other with respect to the axis of rotation of the support roller.

4. The electrode compaction device according to claim 1, characterized in that, The first spiral groove is provided in multiple ways, and the two ends of each first spiral groove extend to the opposite two sides of the first roller pressing surface, and the area between two adjacent first spiral grooves forms the first compaction part; The second spiral groove is provided in multiple ways, and the two ends of each second spiral groove extend to the opposite two sides of the second roller pressing surface, and the area between two adjacent second spiral grooves forms the second compaction part.

5. The electrode compaction device according to claim 1, characterized in that, The first roller surface is provided with a plurality of first annular grooves that are equally spaced along the axial direction of the first roller. Each first annular groove extends along the circumference of the first roller. The area corresponding to the first annular groove forms the first clearance portion, and the area outside the first annular groove forms the first compaction portion. The second roller surface is provided with a plurality of second annular grooves that are equally spaced along the axial direction of the second roller. Each second annular groove extends circumferentially along the second roller. The area corresponding to the second annular groove forms the second clearance portion, and the area outside the second annular groove forms the second compaction portion.

6. The electrode compaction device according to claim 1, characterized in that, It also includes a roller guide assembly, through which the electrode sheet between the first roller gap and the second roller gap can be passed. The roller guide assembly is movable relative to the support roller to adjust the length of the electrode sheet between the first roller gap and the second roller gap.

7. The electrode compaction device according to claim 6, characterized in that, The roller assembly includes a first roller and a second roller. The electrode sheet can pass through the first roller and the second roller in sequence. The entry point of the electrode sheet with the first roller is aligned with the first roller gap, and the exit point of the electrode sheet with the second roller is aligned with the second roller gap.

8. The electrode compaction device according to claim 1, characterized in that, It also includes a drive assembly, which is capable of driving the first pressure roller and the second pressure roller to rotate in the same direction, and is capable of driving the support roller to rotate in the opposite direction relative to the first pressure roller and the second pressure roller.

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