Rubbing wheel, rubbing device and rubbing method for tabs

Abstract

The invention provides a flattening wheel, a flattening device and a flattening method of a pole lug, the flattening wheel comprises a plurality of flattening parts, the plurality of flattening parts are arranged along the axial direction of the flattening wheel, and the plurality of flattening parts can rotate around the axis of the flattening wheel and are used for flattening the pole lug. The technical problem that large friction exists between the rubbing wheel and the tabs can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a rubbing wheel, a rubbing device and a rubbing method of tabs. BACKGROUND

[0002] In a cylindrical battery, the tab is an important component for connecting the internal electrode (positive and negative electrodes) and the external circuit, and tab forming is one of the key processes in the battery manufacturing process. The quality of the tab forming process directly affects the electrical performance, safety and reliability of the battery. To further improve the quality of tab forming, the physical form and structural stability of the tab need to be optimized to ensure the reliability and overall performance of the subsequent processes of the battery. The tab is rubbed.

[0003] In related technologies, the rubbing wheel rotates as a whole around its rotating shaft to rub the tabs of the battery roll core. However, due to the differences in friction force generated between the tabs at different positions and the rubbing wheel during the rubbing process, the related technology of rotating the rubbing wheel as a whole around its rotating shaft to rub the end of the battery roll core cannot adjust different parts of the rubbing wheel according to the actual situation, resulting in a large friction between the rubbing wheel and the tab and a large amount of metal chips. SUMMARY

[0004] Embodiments of the present application provide a rubbing wheel, a rubbing device and a rubbing method of tabs, which can improve the technical problem of large friction between the rubbing wheel and the tab.

[0005] In a first aspect, embodiments of the present application provide a rubbing wheel, which includes a plurality of rubbing parts, the plurality of rubbing parts are arranged along the axial direction of the rubbing wheel, and the plurality of rubbing parts can rotate around the axis of the rubbing wheel respectively for rubbing the tabs.

[0006] The present application can control the rotating speed of each rubbing part of the rubbing wheel, so that each rubbing part has a different rotating speed. During use, the rotating speed of each rubbing part can be controlled according to the actual rubbing situation of the tab, so that the friction between each rubbing part and the tab is small, thereby reducing the generation of metal chips. In some scenarios, when it is found that a rubbing part generates a large amount of metal chips at the rubbed tab, the speed of the rubbing part can be controlled to slow down to reduce the friction at this position. For a cylindrical battery, the generation of metal chips into the center hole can be reduced.

[0007] In an embodiment, the plurality of rubbing parts includes a first part, a second part and a third part, the second part is arranged between the first part and the second part, and when the rubbing wheel rubs the tabs of the roll core, the first part, the second part and the third part are arranged outward along the radial direction of the roll core in sequence.

[0008] This design reduces the friction of the flattening roller on the tabs during flattening, thereby reducing the stress on the tabs and the core.

[0009] In one embodiment, the first portion, the second portion, and the third portion form a conical structure, wherein the diameter of the conical structure gradually increases along the direction from the first portion to the third portion.

[0010] In one embodiment, the cone apex angle n1 of the cone structure ranges from 20° to 80°; and / or

[0011] The base diameter φ1 of the conical structure ranges from 10mm to 50mm; and / or

[0012] The height A1 of the cone structure is in the range of 10mm-100mm.

[0013] In one embodiment, along the axial direction of the kneading roller, the maximum length A2 of the first portion ranges from 0mm to 50mm; and / or

[0014] Along the axial direction of the kneading roller, the maximum length A3 of the second part ranges from 0mm to 50mm; and / or

[0015] Along the axial direction of the kneading roller, the maximum length A4 of the third part ranges from 0mm to 50mm.

[0016] Secondly, embodiments of the present invention provide a kneading device, including the kneading roller as described above.

[0017] Thirdly, embodiments of the present invention provide a method for flattening an electrode tab, applied to a flattening wheel or a flattening device as described above, wherein the core includes an electrode tab, and a flattening portion is used to flatten a predetermined portion of the electrode tab; the method includes:

[0018] The rotation speed of the kneading section is determined based on the central angle of the tab in the preset section.

[0019] In one embodiment, the larger the central angle of the tab in the preset portion, the lower the rotational speed of the kneading portion. This reduces friction during the kneading process.

[0020] In one embodiment, determining the rotational speed of the kneading section based on the central angle of the tab of the preset section includes:

[0021] If the central angle of the electrode tab in the preset part is in the range of 361rad / m-362rad / m, then the rotation speed of the kneading part is determined to be in the range of 100° / s to 3000° / s.

[0022] If the central angle of the electrode tab in the preset part is in the range of 360rad / m-361rad / m, then the rotation speed of the kneading part is determined to be in the range of 100° / s to 4000° / s.

[0023] If the central angle of the tab in the preset section is less than 360 rad / m, the rotation speed of the kneading section is determined to be in the range of 100° / s to 5000° / s.

[0024] In one embodiment, determining the rotational speed of the kneading section based on the central angle of the tab of the preset section includes:

[0025] Based on the first parameter, the rotation speed of the kneading section is determined, wherein the first parameter is the difference in the central angle between any two adjacent loops of the tabs in the preset section.

[0026] In one embodiment, the larger the value of the first parameter, the smaller the rotational speed of the kneading section. This reduces friction during the kneading process.

[0027] In one embodiment, determining the rotational speed of the kneading section based on the central angle of the tab of the preset section includes:

[0028] If the value range of the first parameter a1 is: a1≥0.1rad / m, then the value range of the rotation speed of the kneading part is determined to be 100° / s-3000° / s;

[0029] If the value range of the first parameter a1 is 0.01rad / m≤a1<0.1rad / m, then the value range of the rotation speed of the kneading part is determined to be 100° / s-4000° / s;

[0030] If the value range of the first parameter a1 is a1≤0.01, then the value range of the rotation speed of the kneading part is determined to be 100° / s-5000° / s.

[0031] By calculating the range of values ​​for the central angle of the electrode tab, the number of flattened sections can be determined, thereby enabling segmented control of the flattening of the electrode tab, reducing friction, and thus reducing the generation of metal shavings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the kneading roller provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the core and the kneading wheel before kneading provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the flattened core and the flattening wheel provided in an embodiment of the present invention;

[0036] Figure 4 This is a block diagram of the kneading and smoothing device provided in an embodiment of the present invention;

[0037] Figure 5 This is a flowchart of an embodiment of the method for flattening the tabs provided in the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] In related technologies, the flattening wheel rotates around its axis to flatten the ends of the battery core. However, during the flattening process, the friction generated between the tabs at different positions and the flattening wheel may vary from the center of the core outwards. Therefore, the method of using the flattening wheel to rotate around its axis to flatten the ends of the battery core is difficult to adjust to different parts of the flattening wheel according to the actual situation, resulting in greater friction between the flattening wheel and the tabs and more metal shavings being generated.

[0040] Please combine Figure 1In a first aspect, in the embodiments of this application, a kneading wheel 1 is provided, which includes a plurality of kneading portions 10. The plurality of kneading portions 10 are arranged along the axial direction of the kneading wheel 1 and can rotate around the axis of the kneading wheel 1 respectively, for kneading the tab 91.

[0041] This embodiment of the application can control the rotational speed of multiple smoothing sections 10 of the smoothing roller 1, allowing each section 10 to have a different rotational speed. During use, the rotational speed of each smoothing section 10 can be controlled according to the actual smoothing condition of the tab 91, thereby ensuring minimal friction between each smoothing section 10 and the tab 91, thus reducing the generation of metal shavings. In some scenarios, when a large amount of metal debris is found at the tab 91 corresponding to a certain smoothing section 10, its speed can be slowed down to reduce friction and further reduce metal shavings generation. For cylindrical batteries, in some examples, the core can be wound from a composite layer of two separators, a positive electrode, and a negative electrode. After winding, the winding needle is removed, leaving a central hole where the needle was originally located. Reducing metal shavings generation also reduces the amount of metal shavings entering the central hole.

[0042] Please combine Figure 1 , Figure 1 The dashed line L1-L1 indicates the axis of the kneading wheel 1. In some embodiments, to enable multiple kneading parts 10 to rotate around the axis of the kneading wheel 1 respectively, the kneading device 3 may include multiple motors and multiple rotating shafts. One kneading part 10 corresponds to one motor, and one kneading part 10 corresponds to one rotating shaft. The multiple rotating shafts are coaxially nested. For example, when the multiple kneading parts 10 include a first part 11, a second part 13, and a third part 15, the kneading device 3 may include three motors and a first rotating shaft, a second rotating shaft, and a third rotating shaft. The first rotating shaft, the second rotating shaft, and the third rotating shaft are coaxially nested. For example, the first rotating shaft and the second rotating shaft may be hollow shafts, and the third rotating shaft may be a solid shaft. The second rotating shaft is sleeved on the outer circumference of the third rotating shaft, and the first rotating shaft is sleeved on the outer circumference of the second rotating shaft. The first rotating shaft, the second rotating shaft, and the third rotating shaft are each independently driven by a motor. The third rotating shaft drives the third part 15 to rotate, the second rotating shaft drives the second part 13 to rotate, and the first rotating shaft drives the first part 11 to rotate. Furthermore, the first rotating shaft can be connected to the second rotating shaft via bearings, and the second rotating shaft can be connected to the third rotating shaft via bearings, thereby achieving contactless rotation between the first, second, and third rotating shafts and avoiding interference. The motor can be a servo motor or a stepper motor, etc. This configuration allows the speeds of the first part 11, the second part 13, and the third part 15 to be independently adjustable, with high control precision and fast response speed.

[0043] In this embodiment of the application, the kneading roller 1 may include two kneading parts 10, three kneading parts 10, or four kneading parts 10.

[0044] In some embodiments, to facilitate the flattening of the core 9 by the flattening roller 1, the length of the flattening roller can be equivalent to the radius of the core 9. In one example, the diameter of the core 9 can be 32 mm, then the length of the flattening roller can be configured to be 16 mm.

[0045] In some embodiments, the multiple flattening portions 10 include a first portion 11, a second portion 13, and a third portion 15. The second portion 13 is disposed between the first portion 11 and the second portion 13. When the flattening roller 1 flattens the tabs 91 of the core 9, the first portion 11, the second portion 13, and the third portion 15 are arranged outward in sequence along the radial direction of the core 9.

[0046] By controlling the rotation speed through the three sections of the first part 11, the second part 13, and the third part 15, the friction of the flattening roller 1 on the electrode tab 91 during flattening can be reduced, thereby reducing the stress on the electrode tab 91 and the stress on the core 9.

[0047] Furthermore, as the flattening roller 1 flattens the tabs, the tabs 91 are more prone to becoming disordered when the stress on the core 9 is relatively high. When the stress on the core 9 is relatively low, the tabs are less likely to become disordered. To better support the tabs, the exposed height of the tabs needs to be greater, specifically the height above the diaphragm. Thus, when the stress on the core 9 is relatively low, the exposed height of the tabs can be reduced. When the exposed height of the tabs is reduced, the height of the contact area between the diaphragm and the electrode plates can be increased, which will increase the electrolyte capacity and the energy density of the battery cell.

[0048] Please combine Figure 2 and Figure 3 In some embodiments, the flattening portion 10 is configured as three parts: a first part 11, a second part 13, and a third part 15. When the flattening wheel flattens the tab 91 of the core 9, the first part 11, the second part 13, and the third part 15 are arranged radially outward along the core 9. Thus, during flattening, the first part 11, the second part 13, and the third part 15 flatten the tab 91 radially along the core 9. That is, the first part 11 is used to flatten the position of the tab near the center hole, and the third part 15 is used to flatten the position of the tab away from the center hole.

[0049] Please combine Figure 1 In some embodiments, the first portion 11, the second portion 13, and the third portion 15 form a conical structure 12, wherein the diameter of the conical structure 12 gradually increases along the direction from the first portion 11 to the third portion 15.

[0050] In some embodiments, the apex angle n1 of the conical structure 12 ranges from 20° to 80°. For example, it can be 20°, 30°, 40°, 50°, 60°, 70°, or 80°. In some embodiments, the base diameter φ1 of the conical structure 12 ranges from 10mm to 50mm. For example, it can be 10mm, 20mm, 30mm, 40mm, or 50mm. In some embodiments, the height A1 of the conical structure 12 ranges from 10mm to 100mm. For example, it can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm.

[0051] In some embodiments, the maximum length A2 of the first part 11 along the axial direction of the kneading roller 1 ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0052] In some embodiments, the maximum length A3 of the second part 13 along the axial direction of the kneading wheel ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0053] In some embodiments, the maximum length A4 of the third part 15 along the axial direction of the kneading wheel ranges from 0mm to 50mm, for example, it can be 0mm, 10mm, 20mm, 30mm, 40mm, or 50mm.

[0054] Please combine Figure 4 Secondly, a kneading device 3 is provided, which includes the kneading roller 1 described above.

[0055] Please combine Figure 5 Thirdly, a method for flattening electrode tabs is provided. This method is applied to the aforementioned flattening wheel or the aforementioned flattening device 3. The core 9 includes electrode tabs 91, and a flattening portion 10 is used to flatten a predetermined portion of the electrode tabs 91. The method for flattening electrode tabs includes:

[0056] S1: Determine the rotation speed of the kneading section 10 based on the central angle of the tabs in the preset section.

[0057] In some embodiments, the tab 91 is an uncut tab 91, and after winding, the central angle of each turn of the tab 91 is different. The formula for calculating the central angle m can be:

[0058]

[0059] Where d is the tab width and R is the tab roundness radius.

[0060] In some embodiments, the larger the central angle of the tab in the preset section, the lower the rotation speed of the flattening section. This is because when the flattening wheel flattens the tab with a large central angle, it is difficult to control the flatness. By reducing the rotation speed of the flattening section, friction during the flattening process can be reduced.

[0061] In some embodiments, determining the rotational speed of the kneading section 10 based on the central angle of the tabs of the preset section includes:

[0062] If the central angle of the electrode tab in the preset part is in the range of 361rad / m-362rad / m, then the rotation speed of the kneading part 10 is determined to be in the range of 100° / s to 3000° / s.

[0063] If the central angle of the electrode tab in the preset part is in the range of 360rad / m-361rad / m, then the rotation speed of the kneading part 10 is determined to be in the range of 100° / s to 4000° / s.

[0064] If the central angle of the tab in the preset section is less than 360 rad / m, the rotational speed of the kneading section 10 is determined to be in the range of 100° / s to 5000° / s. In these embodiments, the rotational speed of the kneading section 10 is determined based on the calculated value of the central angle of the tab.

[0065] In one example, by calculating the range of the central angle of the tab, the number of flattening sections can be determined, allowing for segmented control of the tab flattening process, reducing friction, and thus reducing metal shavings. For instance, if the central angle of one tab is in the range of 361 rad / m to 362 rad / m, and the central angle of the other tab is also in the range of 361 rad / m to 362 rad / m, then both tabs can be flattened using a single flattening section. In another example, when the central angle of the first electrode ring is in the range of 361 rad / m-362 rad / m and the central angle of the second electrode ring is in the range of 360 rad / m-361 rad / m, the two electrode rings are flattened by two flattening sections. By controlling the rotation speed of the multiple flattening sections 10, the friction between the multiple flattening sections 10 and the electrode rings 91 can be reduced, thereby reducing the generation of metal shavings. In some scenarios, when a lot of metal shavings are found at the flattened electrode ring 91 corresponding to a certain flattening section 10, its speed can be slowed down to reduce the friction at that point, thereby reducing the generation of metal shavings.

[0066] In one example, when the central angle of the first electrode ring ranges from 361 rad / m to 362 rad / m, and the central angle of the second electrode ring ranges from 360 rad / m to 361 rad / m (the first electrode ring is located radially inside the second electrode ring; the first electrode ring is the inner electrode ring, and the second electrode ring is the outer electrode ring), these two electrode rings can be flattened using two flattening sections. The rotational speeds of the two flattening sections range from 100° / s to 3000° / s and from 100° / s to 4000° / s, respectively. For example, the rotational speed of the flattening section used to flatten the first electrode ring can be 3000° / s, and the rotational speed of the flattening section used to flatten the second electrode ring can be 4000° / s. This allows the flattening section used to flatten the electrode ring with the larger central angle (the first electrode ring, or the inner electrode ring) to have a lower rotational speed. The flattening section used for flattening tabs with small central angles (the second or outer tab) has a higher rotation speed. This is because when the flattening wheel flattens tabs with large central angles, it is difficult to control the flatness. By reducing the rotation speed of the flattening section, friction during the flattening process can be reduced.

[0067] In some embodiments, determining the rotational speed of the kneading section 10 based on the central angle of the tabs of the preset section includes:

[0068] Based on the first parameter, the rotation speed of the kneading section 10 is determined, wherein the first parameter is the difference in the center angle between any two adjacent loops of the electrode in the preset section.

[0069] In these embodiments, the rotational speed of a certain smoothing section 10 is determined based on the difference in the center angle between two adjacent tabs. That is, tabs with a center angle difference within a certain range are smoothed using a smoothing section 10. This allows the rotational speeds of multiple smoothing sections 10 to be controlled separately, thereby enabling each smoothing section 10 to have less friction with the tab 91, thus reducing the generation of metal shavings.

[0070] In some implementations, the larger the value of the first parameter a1, the smaller the rotational speed of the kneading section. It is easily understood that the central angle of the outer ring's tab is smaller than that of the inner ring's tab. The difference in central angles between two adjacent outer rings of tabs is often smaller than that between two adjacent inner rings. This allows the kneading wheel to use a smaller rotational speed to knead tabs with larger central angles. This is because when the kneading wheel kneads tabs with larger central angles, the flatness of the flattened surface is difficult to control. By reducing the rotational speed of the kneading section, friction during the kneading process can be reduced.

[0071] In some embodiments, determining the rotational speed of the kneading section 10 based on the central angle of the tabs of the preset section includes:

[0072] If the range of the first parameter a1 is: a1≥0.1rad / m, then the range of the rotation speed of the kneading part 10 is determined to be 100° / s-3000° / s;

[0073] If the range of the first parameter a1 is 0.01rad / m≤a1<0.1rad / m, then the range of the rotation speed of the kneading part 10 is determined to be 100° / s-4000° / s;

[0074] If the value range of the first parameter a1 is: a1≤0.01, then the value range of the rotation speed of the kneading part 10 is determined to be 100° / s-5000° / s.

[0075] In some examples, from the core outwards radially, there are sequentially arranged first, second, and third loops of pole tabs, with the central angle of the first loop of pole tabs being greater than that of the second loop of pole tabs, which in turn is greater than that of the third loop of pole tabs.

[0076] It is easy to understand that the central angle of the outer ring electrode tab is smaller than that of the inner ring electrode tab. When the difference in central angles between two adjacent outer ring electrode tabs is within the range of a1 ≥ 0.1 rad / m, the difference in central angles between two adjacent inner ring electrode tabs is within the range of a1 ≤ 0.01. According to the method of this application, the two adjacent outer ring electrode tabs can be flattened using a flattening section 10, the rotation speed of which can be 5000° / s. The two adjacent inner ring electrode tabs can be flattened using another flattening section 10, the rotation speed of which can be 3000° / s.

[0077] In one example, if the difference in the central angle between the first and second electrode rings, where the first parameter a1 is in the range of a1 ≥ 0.1 rad / m, and the difference in the central angle between the second and third electrode rings, where the first parameter a1 is in the range of a1 ≥ 0.1 rad / m, then the first, second, and third electrode rings can be smoothed using the same smoothing section 10. In another example, if the difference in the central angle between the first and second electrode rings, where the first parameter a1 is in the range of a1 ≥ 0.1 rad / m, and the difference in the central angle between the second and third electrode rings, where the first parameter a1 is in the range of 0.01 rad / m ≤ a1 < 0.1 rad / m, then the first, second, and third electrode rings can be smoothed using two different smoothing sections 10. The rotational speeds of the two different smoothing sections 10 can be 3000° / s and 4000° / s, respectively.

[0078] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A kneading wheel, characterized in that, The kneading wheel (1) includes multiple kneading parts (10), which are arranged along the axial direction of the kneading wheel (1). The multiple kneading parts (10) can rotate around the axis of the kneading wheel (1) respectively, and are used to knead the tab (91).

2. The kneading wheel according to claim 1, characterized in that, The multiple flattening portions (10) include a first portion (11), a second portion (13), and a third portion (15). The second portion (13) is disposed between the first portion (11) and the second portion (13). When the flattening roller (1) flattens the tabs (91) of the core (9), the first portion (11), the second portion (13), and the third portion (15) are arranged outward in sequence along the radial direction of the core (9).

3. The kneading wheel according to claim 2, characterized in that, The first part (11), the second part (13) and the third part (15) form a conical structure (12), wherein the diameter of the conical structure (12) gradually increases along the direction from the first part (11) to the third part (15).

4. The kneading wheel according to claim 3, characterized in that, The cone apex angle n1 of the conical structure (12) ranges from 20° to 80°; and / or The base diameter φ1 of the conical structure (12) ranges from 10mm to 50mm; and / or The height A1 of the conical structure (12) ranges from 10mm to 100mm.

5. The kneading wheel according to claim 3, characterized in that, Along the axial direction of the kneading roller (1), the maximum length A2 of the first portion (11) ranges from 0mm to 50mm; and / or Along the axial direction of the kneading roller, the maximum length A3 of the second part (13) ranges from 0mm to 50mm; and / or Along the axial direction of the kneading wheel, the maximum length A4 of the third part (15) ranges from 0mm to 50mm.

6. A kneading device (3), characterized in that, Includes the kneading roller as described in any one of claims 1-5.

7. A method for kneading and flattening the earlobe, characterized in that, Applied to a kneading roller as described in any one of claims 1-5 or a kneading device as described in claim 6, the core (9) includes tabs (91), and one of the kneading portions is used to knead the tabs of a predetermined portion; the method includes: The rotation speed of the kneading section is determined based on the central angle of the tab in the preset section.

8. The method for flattening the electrode ear according to claim 7, characterized in that, The larger the central angle of the tab in the preset section, the lower the rotation speed of the kneading section.

9. The method for flattening the electrode ear according to claim 7, characterized in that, The step of determining the rotational speed of the kneading section based on the central angle of the electrode tab in the preset section includes: If the central angle of the electrode tab in the preset part is in the range of 361rad / m-362rad / m, then the rotation speed of the kneading part is determined to be in the range of 100° / s to 3000° / s. If the central angle of the electrode tab in the preset part is in the range of 360rad / m-361rad / m, then the rotation speed of the kneading part is determined to be in the range of 100° / s to 4000° / s. If the central angle of the tab in the preset section is less than 360 rad / m, the rotation speed of the kneading section is determined to be in the range of 100° / s to 5000° / s.

10. The method for flattening the electrode ear according to claim 7, characterized in that, The step of determining the rotational speed of the kneading section based on the central angle of the electrode tab in the preset section includes: Based on the first parameter, the rotation speed of the kneading section is determined, wherein the first parameter is the difference in the central angle between any two adjacent loops of the tabs in the preset section.

11. The method for flattening the electrode ear according to claim 10, characterized in that, The larger the value of the first parameter, the smaller the rotation speed of the kneading section.

12. The method for flattening the electrode ear according to claim 10, characterized in that, The step of determining the rotational speed of the kneading section based on the central angle of the electrode tab in the preset section includes: If the value range of the first parameter a1 is: a1≥0.1rad / m, then the value range of the rotation speed of the kneading part is determined to be 100° / s-3000° / s; If the value range of the first parameter a1 is 0.01rad / m≤a1<0.1rad / m, then the value range of the rotation speed of the kneading part is determined to be 100° / s-4000° / s; If the value range of the first parameter a1 is: a1≤0.01, then the value range of the rotation speed of the kneading part is determined to be 100° / s-5000° / s.

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