Rolling device and battery manufacturing equipment

Abstract

The embodiment of the utility model provides a rolling device and battery manufacturing equipment. The rolling device is used for rolling the tabs, the rolling device comprises a pressing roller, the pressing roller comprises a roller body and a rolling part, and the rolling part is arranged on the outer peripheral surface of the roller body in a protruding mode in the circumferential direction of the roller body; wherein in the axial direction of the compression roller, the compression roller comprises a plurality of rib pressing areas which are sequentially arranged, the compression roller comprises a plurality of roller sections which are sequentially arranged, the multiple roller sections are detachably connected, the number of the roller sections is equal to that of the rib pressing areas, and each roller section is provided with one rib pressing area; the peripheral surfaces of the roller bodies in all the ribbing areas are coplanar, and the heights of the rolling parts of at least two of the plurality of ribbing areas protruding out of the peripheral surfaces of the roller bodies are not equal. According to the technical scheme provided by the invention, the risk of tab folding can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a rolling device and battery manufacturing equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the manufacturing process of batteries, laser die-cutting has become an indispensable link in the production process of pole pieces. After the pole pieces are laser formed, when they pass through the rollers, the pole ears are prone to folding, which affects the reliability of the battery cells. How to improve the reliability of the battery cells is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides a rolling device and battery manufacturing equipment, which can reduce the risk of tab folding.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a rolling device, which is used for rolling the pole ear, and the rolling device includes a pressing roller, and the pressing roller includes a roller body and a rolling portion, and the rolling portion is arranged on the outer peripheral surface of the roller body along the circumferential direction of the roller body; wherein, along the axial direction of the pressing roller, the pressing roller includes a plurality of ribbed areas arranged in sequence, and the pressing roller includes a plurality of roller segments arranged in sequence, and the plurality of roller segments are detachably connected to each other, the number of the roller segments is equal to the number of the ribbed areas, and each roller segment has a ribbed area; the outer peripheral surfaces of the roller bodies in the respective ribbed areas are coplanar, and the heights of the rolling portions of at least two of the plurality of ribbed areas protruding from the outer peripheral surface of the roller body are unequal.

[0007] In the technical solution of the embodiment of the present application, when the tab passes through the over-roller, the forces on different regions of the tab are different, and the tab is prone to folding problems. By dividing the pressure roller along its axial direction into multiple rib pressing regions, the heights of at least two roller pressing parts in the multiple rib pressing regions protruding from the outer peripheral surface of the roller body are not equal. That is, when the pressure roller performs roller pressing on the tab, embossing with different pit depths can be formed on the surfaces of different regions of the tab. The pressure roller uses a stepped roller pressing part to perform differential roller pressing on different regions of the tab, which can specifically strengthen the strengths of different regions of the tab, improve the overall strength of the tab, improve the stress distribution of the tab when passing through the over-roller, reduce the probability of stress concentration of the tab in a local region, thereby reducing the risk of tab folding and improving the reliability of the battery cell. Moreover, the pressure roller includes multiple roller sections arranged in sequence, and the multiple roller sections in the pressure roller are connected in a detachable manner, which facilitates the disassembly and combination of each roller section in the pressure roller. Moreover, the number of roller sections in the pressure roller can be selected and adjusted according to the actual situation of the shape and force distribution of the tab, and each roller section in the pressure roller corresponds to a rib pressing region, and the shapes of the roller pressing parts of each rib pressing region can be matched as needed, so as to combine to form pressure rollers with different numbers and / or different shapes of roller pressing parts, with good flexibility, strong adjustability, and being more likely to meet the shaping requirements of the actual working conditions of the tab, and the applicable range of the pressure roller is wider.

[0008] According to some embodiments of the present application, a step is formed between the roller pressing parts of two adjacent rib pressing regions among the multiple rib pressing regions; along the axial direction of the pressure roller, the pressure roller has a first end and a second end arranged oppositely. Pointing from the first end to the second end, the heights of the roller pressing parts in the multiple rib pressing regions protruding from the outer peripheral surface of the roller body increase in sequence.

[0009] In the above solution, there is a height difference between the roller pressing parts of two adjacent rib pressing regions among the multiple rib pressing regions, so a step is formed between two adjacent roller pressing parts. Since the ductility of one end of the tab close to the main body region of the tab (the region where the current collector is provided with the active material layer) and the end of the tab far from the main body region generally shows a gradual change, in the direction from the end of the tab far from the main body region to the end of the tab close to the main body region, the ductility of the tab gradually decreases, and the bending strength of the tab gradually increases. In the direction from the first end to the second end, the heights of the roller pressing parts in the multiple rib pressing regions protruding from the outer peripheral surface of the roller body increase in sequence, so as to form reinforcing ribs with gradually increasing pit depths on the tab, specifically strengthen the corresponding regions of the tab, improve the strength of the tab, enable the tab to better adapt to complex stress environments, and reduce the risk of tab folding.

[0010] According to some embodiments of the present application, along the axial direction of the pressure roller, the roller pressing part includes multiple sub-roller pressing parts, and each rib pressing region has one sub-roller pressing part; the multiple sub-roller pressing parts at least include at least one of a first sub-roller pressing part, a second sub-roller pressing part, and a third sub-roller pressing part, and the shapes of the reinforcing ribs in the first sub-roller pressing part, the second sub-roller pressing part, and the third sub-roller pressing part are different.

[0011] In the above solution, each rib pressing area has a sub-roll pressing part. The multiple sub-roll pressing parts include at least one of a first sub-roll pressing part, a second sub-roll pressing part, and a third sub-roll pressing part. The sub-roll pressing part of the pressing roll can select reinforcing ribs with corresponding shapes according to the actual situation, so as to specifically strengthen the strength of different regions of the tab.

[0012] According to some embodiments of the present application, the first sub-roll pressing part includes a plurality of first reinforcing ribs. The first reinforcing ribs are strip-shaped, and the length direction of the first reinforcing ribs is parallel to the axial direction of the pressing roll. The plurality of first reinforcing ribs are distributed at intervals along the circumferential direction of the roll body.

[0013] In the above solution, the first sub-roll pressing part includes a plurality of first reinforcing ribs, and the first reinforcing ribs are strip-shaped structures. After the first roll pressing part presses the tab, it can provide a linear strengthening effect to the tab, improve the strength of the tab, and reduce the risk of the tab being folded.

[0014] According to some embodiments of the present application, the sub-roll pressing parts in the multiple rib pressing areas are all first sub-roll pressing parts, and the first reinforcing ribs have a first width in the circumferential direction of the pressing roll; pointing from the first end to the second end, the first widths of the first reinforcing ribs in the multiple rib pressing areas gradually increase.

[0015] In the above solution, if the sub-roll pressing parts in the multiple rib pressing areas all adopt strip-shaped first reinforcing ribs, embossing with the same first reinforcing rib pattern can be formed on the surface of the tab by roll pressing. Pointing from the first end to the second end, the protruding heights of each sub-roll pressing part gradually increase, and the first widths of the first reinforcing ribs gradually increase. Therefore, embossing with gradually increasing tooth depth and gradually increasing tooth width can be formed in different regions of the tab, so as to specifically strengthen different regions of the tab, and the shaping effect of the tab is better.

[0016] According to some embodiments of the present application, along the axial direction of the pressing roll, the extending directions of the first reinforcing ribs in the multiple rib pressing areas are located on the same straight line.

[0017] In the above solution, if the extending directions of the first reinforcing ribs in the multiple rib pressing areas are located on the same straight line, then after the pressing roll presses the tab, the embossing formed in different regions of the tab will also be on the same straight line in the axial direction of the pressing roll. The continuity of the embossing formed in different regions of the tab is better, the distribution of the first reinforcing ribs is more regular, and the shaping effect of the tab is better.

[0018] According to some embodiments of the present application, the second sub-roll pressing part includes a plurality of second reinforcing ribs. The second reinforcing ribs are polygonal, and the plurality of second reinforcing ribs are distributed in sequence along the axial and circumferential directions of the roll body, and two adjacent second reinforcing ribs are connected in sequence.

[0019] In the above solution, the second reinforcing rib is in a polygonal shape. When the second reinforcing rib rolls the tab, it has a large contact area with the tab and a uniform stress distribution, and can be applied to the area where the tab needs to bear a large pressure and the force is uniform.

[0020] According to some embodiments of the present application, the third sub-rolling part includes a plurality of third reinforcing ribs, the plurality of third reinforcing ribs are distributed along the circumferential direction of the roller body, and two adjacent third reinforcing ribs are connected in sequence; the third reinforcing rib includes a first sub-reinforcing rib and a second sub-reinforcing rib connected to each other, and the first sub-reinforcing rib and the second sub-reinforcing rib are arranged at an angle.

[0021] In the above solution, the third reinforcing rib includes a first sub-reinforcing rib and a second sub-reinforcing rib, and the first sub-reinforcing rib and the second sub-reinforcing rib are arranged at an angle, that is, the shape of the third reinforcing rib as a whole is V-shaped. After the third reinforcing rib rolls the tab, the tab has good bending and tensile resistance properties, and can roll the middle area of the tab to improve the strength of the corresponding area of the tab.

[0022] According to some embodiments of the present application, any one of two adjacent roller sections is provided with a protrusion, and the other is provided with a groove that cooperates with the protrusion, and two adjacent roller sections are connected by the protrusion and the groove.

[0023] In the above solution, by connecting two adjacent roller sections by means of a protrusion and a groove, the installation and disassembly of each roller section in the pressure roller are convenient and fast, can be flexibly combined, and have a wide range of applications.

[0024] In a second aspect, the embodiments of the present application further provide a battery manufacturing device, and the battery manufacturing device includes the rolling device of any one of the foregoing embodiments.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of a pressure roller provided for some embodiments of the present application;

[0028] Figure 2 For Figure 1 Explosion schematic diagram of the middle pressure roller;

[0029] Figure 3 Schematic diagram of different first widths of the first reinforcing rib of the pressure roller provided in some embodiments of the present application;

[0030] Figure 4 For Figure 3 explosion schematic diagram of the middle pressure roller;

[0031] Figure 5 Schematic diagram of the structure of the pressure roller after different combinations of sub-roller pressing parts provided in some other embodiments of the present application;

[0032] Figure 6 For Figure 5 explosion schematic diagram of the middle pressure roller;

[0033] Figure 7 Schematic diagram of different structures of each sub-roller pressing part in the pressure roller provided in some other embodiments of the present application;

[0034] Figure 8 For Figure 7 explosion schematic diagram of the middle pressure roller;

[0035] Figure 9 Schematic diagram of the structure of the pressure roller provided in some other embodiments of the present application;

[0036] Figure 10 For Figure 9 explosion schematic diagram of the middle pressure roller;

[0037] Figure 11 For Figure 9 schematic diagram of the structure of the middle pressure roller pressing the pole piece.

[0038] Icon: 100 - rolling device; 10 - pressure roller; 11 - roller body; 12 - rolling part; 122 - first sub-rolling part; 1221 - first reinforcing rib; 123 - second sub-rolling part; 1231 - second reinforcing rib; 124 - third sub-rolling part; 1241 - third reinforcing rib; 1241a - first sub-reinforcing rib; 1241b - second sub-reinforcing rib; 13 - rib pressing area; 14 - roller section; 141 - protrusion; 142 - groove; 15 - first end; 16 - second end; 200 - pole piece; 201 - pole ear; 2011 - third end; 2012 - fourth end; 202 - main body area. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application pertains; the terms used in the description of the application in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0041] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the description does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0044] The term "plurality" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple sheets" refers to two or more sheets (including two sheets).

[0045] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0046] In some embodiments, the positive electrode may be a positive electrode tab, and the positive electrode tab may include a positive current collector and a positive active material provided on at least one surface of the positive current collector.

[0047] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is provided on any one or both of the two opposite surfaces of the positive current collector.

[0048] As an example, the positive current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0049] As an example, the positive active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive active materials may also be used.

[0050] In some embodiments, the negative electrode may be a negative electrode tab, and the negative electrode tab may include a negative current collector.

[0051] As an example, the negative current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium, etc. may be used.

[0052] The electrode tab includes a current collector and an active material layer. The current collector includes a main body region and a tab. The active material layer is provided on the main body region, and the tab is not provided with the active material layer.

[0053] From the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0054] In the manufacturing process of the battery, laser die-cutting has become an essential link in the electrode tab production process. After the electrode tab is laser formed, when the electrode tab passes through the roller, due to the different forces on different regions of the tab, the phenomenon of tab folding is likely to occur, affecting the reliability of the battery cell.

[0055] In view of this, to solve the problem that the tab is prone to bending, some embodiments of the present application provide a rolling device for rolling the tab. The rolling device includes a pressing roller, and the pressing roller includes a roller body and a rolling portion. The rolling portion is convexly arranged on the outer peripheral surface of the roller body along the circumferential direction of the roller body. Among them, along the axial direction of the pressing roller, the pressing roller includes a plurality of pressing rib regions arranged in sequence, and the outer peripheral surfaces of the roller bodies in each pressing rib region are coplanar. The heights of the rolling portions protruding from the outer peripheral surface of the roller body in at least two of the plurality of pressing rib regions are not equal.

[0056] In such a rolling device, by dividing the pressing roller into a plurality of pressing rib regions along its axial direction, and the heights of the rolling portions protruding from the outer peripheral surface of the roller body in at least two of the plurality of pressing rib regions are not equal. That is, when the pressing roller rolls the tab of the pole piece, embossing with different pit depths can be formed on the surfaces of different regions of the tab. The pressing roller uses a stepped rolling portion to perform differential rolling on different regions of the tab, which can specifically strengthen the strengths of different regions of the tab, improve the overall strength of the tab, improve the stress distribution of the tab when passing through the roller, reduce the probability of stress concentration of the tab in a local area, thereby reducing the risk of tab folding and improving the reliability of the battery cell.

[0057] Some embodiments of the present application provide a rolling device. Please refer to Figures 1 to 11 , the rolling device 100 is used for rolling the tab 201. The rolling device 100 includes a pressing roller 10. The pressing roller 10 includes a roller body 11 and a rolling portion 12. The rolling portion 12 is convexly arranged on the outer peripheral surface of the roller body 11 along the circumferential direction of the roller body 11. Among them, along the axial direction of the pressing roller 10, the pressing roller 10 includes a plurality of pressing rib regions 13 arranged in sequence. The pressing roller 10 includes a plurality of roller segments 14 arranged in sequence. The plurality of roller segments 14 are detachably connected. The number of roller segments 14 is equal to the number of pressing rib regions 13. Each roller segment 14 has a pressing rib region 13. The outer peripheral surfaces of the roller bodies 11 in each pressing rib region 13 are coplanar. The heights of the rolling portions 12 protruding from the outer peripheral surface of the roller body 11 in at least two of the plurality of pressing rib regions 13 are not equal.

[0058] After the pole piece 200 is laser formed and passes through a roller with a large wrap angle, the tab 201 is prone to folding, resulting in deformation of the tab 201. Before laser die-cutting the pole piece 200, the rolling device 100 can be used to shape the tab 201 of the pole piece 200 to increase its rigidity, thereby reducing the risk of folding of the tab 201 when passing through the roller.

[0059] The material of the rolling portion 12 can be titanium alloy, stainless steel or high-performance composite materials (such as carbon fiber reinforced composite materials), etc. The rolling portion 12 and the roller body 11 can be integrally formed.

[0060] The roller body 11 is the main structure of the pressure roller 10. The roller pressing part 12 refers to the rib structure protruding from the outer peripheral surface of the roller body 11. The roller pressing part 12 can roll press the tab 201 of the electrode sheet 200 before laser die-cutting, and can form embossing with the same pattern shape as the roller pressing part 12 on the surface of the tab 201, playing a role in shaping and strengthening the tab. The pattern shapes of the roller pressing parts 12 in each of the multiple rib pressing areas 13 can be the same or not completely the same, and the pattern shapes of the roller pressing parts 12 in the multiple rib pressing areas 13 can be selected according to the specific actual situation.

[0061] Along the axial direction of the pressure roller 10, the number of rib pressing areas 13 in the pressure roller 10 is an integer value such as two, three, or four, and the specific number of rib pressing areas 13 in the pressure roller 10 can be determined according to the actual situation.

[0062] The outer peripheral surfaces of the roller body 11 in each rib pressing area 13 are coplanar, which means that the roller body 11 corresponding to each rib pressing area 13 is a roller body 11 with the same outer diameter. The heights at which the roller pressing parts 12 in at least two of the multiple rib pressing areas 13 protrude from the outer peripheral surface of the roller body 11 are not equal, which means that the protruding heights of the roller pressing parts 12 in at least two of the multiple rib pressing areas 13 are different. Of course, it is also possible that the protruding heights of the roller pressing parts 12 in each of the multiple rib pressing areas 13 are all different.

[0063] The protruding heights at which the roller pressing parts 12 of the multiple rib pressing areas 13 protrude from the roller body 11 can be irregularly distributed, and can be specifically set according to the actual stress situation of the tab 201. For example, along the axial direction of the pressure roller 10, the protruding heights of the roller pressing parts 12 in each rib pressing area 13 can increase or decrease in sequence, or the protruding height of the roller pressing part 12 at the middle position of the pressure roller 10 is large, and the protruding heights of the roller pressing parts 12 at both axial ends of the pressure roller 10 are small.

[0064] The pressure roller 10 includes a plurality of roller segments 14 arranged in sequence, which means that the pressure roller 10 is axially split into a plurality of roller segments 14. Each roller segment 14 has a rib pressing area 13, and a rib pressing area 13 has a roller pressing part 12. The number of roller segments 14 in the pressure roller 10 and the shape of the roller pressing part 12 of the corresponding rib pressing area 13 can be combined and matched according to actual needs, with a wider adaptation range.

[0065] There can be various ways of detachable connection between the multiple roller segments 14. For example, the multiple roller segments 14 can also adopt the method of cooperation between the protrusion 141 and the groove 142; or, there are connection holes axially penetrating between the multiple roller segments 14. The bolt includes a screw rod and a nut. After the screw rod passes through the connection holes of the multiple roller segments 14, it is locked by the nut. Of course, it can also be the method of combining the cooperation between the protrusion 141 and the groove 142 and locking with bolts for connection.

[0066] In the technical solution of the embodiment of the present application, when the tab 201 passes through the over-roller, the forces on different regions of the tab are different, and the tab 201 is prone to folding problems. By dividing the pressure roller 10 into multiple rib pressing regions 13 along its axial direction, the heights of at least two roller pressing parts 12 in the multiple rib pressing regions 13 protruding from the outer peripheral surface of the roller body 11 are not equal. That is, when the pressure roller 10 rolls the tab 201 of the electrode tab 200, embossings with different pit depths can be formed on the surfaces of different regions of the tab 201. The pressure roller 10 uses the stepped roller pressing part 12 to perform differential rolling on different regions of the tab 201, which can specifically strengthen the strengths of different regions of the tab 201, improve the overall strength of the tab 201, improve the stress distribution of the tab 201 when passing through the over-roller, reduce the probability of stress concentration of the tab 201 in a local region, thereby reducing the risk of folding of the tab 201 and improving the reliability of the battery cell. Moreover, the pressure roller 10 includes multiple roller sections 14 arranged in sequence, and the multiple roller sections 14 in the pressure roller 10 are detachably connected, which facilitates the disassembly and combination of each roller section 14 in the pressure roller 10. Moreover, the number of roller sections 14 in the pressure roller 10 can be selected and adjusted according to the actual shape and force distribution of the tab 201, and each roller section 14 in the pressure roller 10 corresponds to a rib pressing region 13, and the shapes of the roller pressing parts 12 of each rib pressing region 13 can be matched as required, so as to combine and form a pressure roller 10 with different numbers and / or different shapes of sub-roller pressing parts, with good flexibility and strong adjustability, and it is easier to meet the shaping requirements of the actual working conditions of the tab 201, and the applicable range of the pressure roller 10 is wider.

[0067] According to some embodiments of the present application, please refer to Figure 1 and Figure 2 , a step is formed between the roller pressing parts 12 of two adjacent rib pressing regions 13 among the multiple rib pressing regions 13; along the axial direction of the pressure roller 10, the pressure roller 10 has a first end 15 and a second end 16 arranged oppositely, and pointing from the first end 15 to the second end 16, the heights of the roller pressing parts 12 in the multiple rib pressing regions 13 protruding from the outer peripheral surface of the roller body 11 increase in sequence.

[0068] Please refer to Figure 11 , one end of the tab 201 far from the main body region 202 of the electrode tab 200 is the third end 2011, and one end of the tab 201 close to the main body region 202 of the electrode tab 200 is the fourth end 2012. The fourth end 2012 of the tab 201 extends less relative to the third end 2011. The first end 15 and the second end 16 are the two ends in the axial direction of the pressure roller 10, and the direction from the first end 15 to the second end 16 can correspond to the direction from the third end 2011 to the fourth end 2012 of the tab 201 when the pressure roller 10 rolls the tab 201 of the electrode tab 200.

[0069] That adjacent roller pressing parts 12 of two adjacent rib pressing areas 13 form a step means that on a cross-section obtained by a plane passing through the central axis of the pressing roller 10, the outer peripheral surfaces of the roller pressing parts 12 of two adjacent rib pressing areas 13 and the connecting surface connecting the outer peripheral surfaces of the roller pressing parts 12 of these two rib pressing areas 13 form a step.

[0070] The specific difference in height between two adjacent roller pressing parts 12 can be designed and optimized according to the stress conditions in different areas of the tab 201, so that the tab 201 can maintain good performance when subjected to various stresses such as tension, compression, and bending.

[0071] There is a height difference between the roller pressing parts 12 of two adjacent rib pressing areas 13 among multiple rib pressing areas 13, so a step is formed between two adjacent roller pressing parts 12. Since the ductility of the tab 201 is generally gradually distributed from the end close to the main body area 202 (the area where the current collector is provided with the active material layer) of the tab 200 to the end far from the main body area 202, in the direction from the end of the tab 201 far from the main body area 202 to the end of the tab 201 close to the main body area 202, the ductility of the tab 201 gradually decreases and the bending strength of the tab 201 gradually increases. In the direction from the first end 15 to the second end 16, the height of the roller pressing parts 12 in multiple rib pressing areas 13 protruding from the outer peripheral surface of the roller body 11 increases in sequence, so that reinforcing ribs with gradually increasing pit depths are formed on the tab 201, specifically strengthening the corresponding areas of the tab 201, improving the strength of the tab 201, enabling the tab 201 to better adapt to the complex stress environment, and reducing the risk of the tab 201 folding.

[0072] According to some embodiments of the present application, please refer to Figures 3 to 11 Along the axial direction of the pressing roller 10, the roller pressing part 12 includes multiple sub-roller pressing parts, and each rib pressing area 13 has one sub-roller pressing part; the multiple sub-roller pressing parts at least include at least one of a first sub-roller pressing part 122, a second sub-roller pressing part 123, and a third sub-roller pressing part 124, and the shapes of the reinforcing ribs in the first sub-roller pressing part 122, the second sub-roller pressing part 123, and the third sub-roller pressing part 124 are different.

[0073] The multiple sub-roll-pressing parts at least include at least one of a first sub-roll-pressing part 122, a second sub-roll-pressing part 123, and a third sub-roll-pressing part 124, which means that the multiple sub-roll-pressing parts can all be one of the first sub-roll-pressing part 122, the second sub-roll-pressing part 123, or the third sub-roll-pressing part 124. Of course, it is also possible that the multiple sub-roll-pressing parts can be a combination of the first sub-roll-pressing part 122 and the second sub-roll-pressing part 123, or a combination of the second sub-roll-pressing part 123 and the third sub-roll-pressing part 124, or a combination of the first sub-roll-pressing part 122 and the third sub-roll-pressing part 124. Of course, it is also possible that the multiple sub-roll-pressing parts include the first sub-roll-pressing part 122, the second sub-roll-pressing part 123, and the third sub-roll-pressing part 124. The multiple sub-roll-pressing parts in the roller 10 can select the first sub-roll-pressing part 122, the second sub-roll-pressing part 123, or the third sub-roll-pressing part 124 according to the actual situation.

[0074] Please refer to Figures 3 to 11 , the shape of the reinforcing ribs of the multiple sub-roll-pressing parts can be strip-shaped, polygonal, V-shaped, or dot-shaped teeth, etc. The shape of each sub-roll-pressing part in the roller 10 can select at least one, two, or multiple shapes of reinforcing ribs for combination according to the overall stress situation and working environment of the tab 201.

[0075] In addition, the surface of the reinforcing ribs in the sub-roll-pressing part can be specially treated, such as surface hardening, coating, etc. of the reinforcing ribs, to improve its wear resistance and corrosion resistance and extend the service life of the roll-pressing part 12. The outer edges of the two sub-roll-pressing parts at both axial ends of the roller 10 can be rounded.

[0076] Each ribbing area 13 has a sub-roll-pressing part. The multiple sub-roll-pressing parts at least include at least one of a first sub-roll-pressing part 122, a second sub-roll-pressing part 123, and a third sub-roll-pressing part 124. The sub-roll-pressing part of the roller 10 can select the corresponding-shaped reinforcing ribs according to the actual situation, so as to specifically strengthen the strength of different regions of the tab 201.

[0077] According to some embodiments of the present application, the first sub-roll-pressing part 122 includes a plurality of first reinforcing ribs 1221. The first reinforcing ribs 1221 are strip-shaped, the length direction of the first reinforcing ribs 1221 is parallel to the axial direction of the roller 10, and the plurality of first reinforcing ribs 1221 are spaced circumferentially along the roller body 11.

[0078] The first reinforcing ribs 1221 are strip-shaped, that is, the first reinforcing ribs 1221 are strip-shaped convex ribs, and the extending direction of the first reinforcing ribs 1221 is parallel to the axial direction of the roller 10. The plurality of first reinforcing ribs 1221 can be equally spaced or unequally spaced along the circumferential direction of the roller body 11.

[0079] The first sub-rolling part 122 includes a plurality of first reinforcing ribs 1221. The first reinforcing ribs 1221 are in a strip-like structure. After the first sub-rolling part 122 rolls the tab 201, it can provide a linear strengthening effect to the tab 201, improve the strength of the tab 201, and reduce the risk of the tab 201 being folded.

[0080] According to some embodiments of the present application, please refer to Figures 1 to 4 , the sub-rolling parts in the plurality of ribbing areas 13 are all the first sub-rolling parts 122, and the first reinforcing ribs 1221 have a first width in the circumferential direction of the pressing roller 10; pointing from the first end 15 to the second end 16, the first widths of the first reinforcing ribs 1221 in the plurality of ribbing areas 13 increase in sequence.

[0081] The first width refers to the extension width of the first reinforcing rib 1221 in the circumferential direction of the pressing roller 10. It can be understood that, taking the end of the tab 201 far from the main body area 202 as the third end 2011 and the end of the tab 201 close to the main body area 202 as the fourth end 2012 as an example. The direction from the third end 2011 to the fourth end 2012 corresponds to the direction from the first end 15 to the second end 16 of the pressing roller 10. The extension of the third end 2011 of the tab 201 is large, and the extension of the fourth end 2012 of the tab 201 is small. The area of the third end 2011 of the tab 201 far from the tab 200 corresponds to the first sub-rolling part 122 with a small tooth depth and a narrow tooth width, while the area of the fourth end 2012 of the tab 201 close to the tab 200 can correspond to the first sub-rolling part 122 with a large tooth depth and a thick tooth width.

[0082] Adopting the sub-rolling parts in the plurality of ribbing areas 13 as strip-shaped first reinforcing ribs 1221 can roll embossings with the same texture as the first reinforcing ribs 1221 on the surface of the tab 201. Pointing from the first end 15 to the second end 16, the protruding heights of the respective sub-rolling parts increase in sequence, and the first widths of the first reinforcing ribs 1221 increase in sequence, so that embossings with gradually increasing tooth depth and gradually increasing tooth width can be rolled in different areas of the tab 201, and targeted strengthening of different areas of the tab 201 is carried out, and the shaping effect of the tab 201 is better.

[0083] According to some embodiments of the present application, along the axial direction of the pressing roller 10, the extending directions of the first reinforcing ribs 1221 in the plurality of ribbing areas 13 are located on the same straight line.

[0084] The extending directions of the first reinforcing ribs 1221 in the plurality of ribbing areas 13 being located on the same straight line means that the plurality of first reinforcing ribs 1221 on the same axis in the plurality of ribbing areas 13 are on the same straight line.

[0085] If the extending directions of the first reinforcing ribs 1221 in multiple bead regions 13 are on the same straight line, then after the pressure roller 10 rolls the tab 201, the embossments formed in different regions of the tab 201 will also be on the same straight line in the axial direction of the pressure roller 10. The continuity of the embossments formed in different regions of the tab 201 is better, the distribution of the first reinforcing ribs 1221 is more regular, and the shaping effect on the tab 201 is better.

[0086] According to some embodiments of the present application, the second sub-rolling part 123 includes a plurality of second reinforcing ribs 1231. The second reinforcing ribs 1231 are in a polygonal shape. The plurality of second reinforcing ribs 1231 are sequentially distributed along the axial and circumferential directions of the roller body 11, and two adjacent second reinforcing ribs 1231 are sequentially connected.

[0087] The second reinforcing ribs 1231 are in a polygonal shape. For example, the shape of the second reinforcing ribs 1231 can be any one of a triangle, a quadrilateral, a pentagon, or a hexagon.

[0088] Optionally, the shape of the second reinforcing ribs 1231 is a hexagon.

[0089] When the second reinforcing ribs 1231 are in a polygonal shape and roll the tab 201, they have a large contact area with the tab 201 and a uniform stress distribution, and can be applied to the area where the tab 201 needs to bear a large pressure and the force is uniform.

[0090] According to some embodiments of the present application, the third sub-rolling part 124 includes a plurality of third reinforcing ribs 1241. The plurality of third reinforcing ribs 1241 are distributed along the circumferential direction of the roller body 11, and two adjacent third reinforcing ribs 1241 are sequentially connected; the third reinforcing ribs 1241 include a first sub-reinforcing rib 1241a and a second sub-reinforcing rib 1241b that are connected to each other, and the first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b are arranged at an angle.

[0091] The first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b are arranged at an angle. The included angle range between the first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b can be any angle in the range of 15° - 45°. After two adjacent third reinforcing ribs 1241 are connected, they form a W shape.

[0092] The third reinforcing ribs 1241 include a first sub-reinforcing rib 1241a and a second sub-reinforcing rib 1241b, and the first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b are arranged at an angle, that is, the overall shape of the third reinforcing ribs 1241 is a V shape. After the third reinforcing ribs 1241 roll the tab 201, the tab 201 has good bending and tensile resistance properties, and can roll the middle region of the tab 201 to improve the strength of the corresponding region of the tab 201.

[0093] Taking the pressing roller 10 including three sequentially arranged roller sections 14 as an example, the three roller sections 14 have three rib pressing areas 13. The three sub-roller pressing parts in the three rib pressing areas 13 can select sub-roller pressing parts with the same reinforcing rib shape or different-shaped sub-roller pressing parts according to the actual situation, with strong flexibility. There are various shapes for the combination of the roller pressing parts 12 in the three rib pressing areas 13 of the pressing roller 10. Some combination cases of the pressing roller 10 are illustrated below.

[0094] For example, please refer to Figures 1 to 4 , the three sub-roller pressing parts of the pressing roller 10 can all be three first sub-roller pressing parts 122. Of course, please refer to Figure 5 and Figure 6 , the three sub-roller pressing parts can be a combination of two first sub-roller pressing parts 122 and one second sub-roller pressing part 123, and the second sub-roller pressing part 123 is located between the two first sub-roller pressing parts 122; or, please refer to Figure 9 and Figure 10 , the three sub-roller pressing parts include two first sub-roller pressing parts 122 and one second sub-roller pressing part 123, the second sub-roller pressing part 123 is arranged close to the first end 15 of the pressing roller 10, and the two first sub-roller pressing parts 122 are arranged close to the second end 16 of the pressing roller 10. Please refer to Figure 7 and Figure 8 , it can also be that the three sub-roller pressing parts include a first sub-roller pressing part 122, a second sub-roller pressing part 123, and a third sub-roller pressing part 124, and the second sub-roller pressing part 123 is located between the first sub-roller pressing part 122 and the third sub-roller pressing part 124.

[0095] According to some embodiments of the present application, please refer to Figure 2 , any one of the adjacent two roller sections 14 is provided with a protrusion 141, and the other is provided with a groove 142 that cooperates with the protrusion 141. The adjacent two roller sections 14 are connected by the protrusion 141 and the groove 142.

[0096] The protrusion 141 and the groove 142 can be in the form of a tenon and a mortise, that is, the multiple roller sections 14 can be connected in a mortise and tenon connection manner, etc. The adjacent two roller sections 14 can be connected in a mortise and tenon manner. For example, at least one tenon and at least one mortise are respectively arranged at the two axial ends of the roller section 14, and the tenon and the mortise are in interference fit, and the adjacent two roller sections 14 are connected by the mortise and tenon manner, and the connection stability of each roller section 14 in the pressing roller 10 is strong.

[0097] Optionally, two tenons and two mortises are respectively arranged at the two axial ends of the roller section 14, and the adjacent two roller sections 14 are connected by the two tenons and two mortises.

[0098] The adjacent two roller segments 14 are connected by means of the protrusions 141 and the grooves 142, so that the installation and disassembly of each roller segment 14 in the pressure roller 10 are convenient and fast, can be flexibly combined, and have a wide range of applications.

[0099] The embodiment of the present application further provides a battery manufacturing device, and the battery manufacturing device includes the rolling device of any one of the foregoing embodiments.

[0100] In some embodiments, the rolling device 100 includes a pressure roller 10, the pressure roller 10 includes a roller body 11 and a rolling part 12, and the rolling part 12 is convexly arranged on the outer peripheral surface of the roller body 11 along the circumferential direction of the roller body 11; wherein, along the axial direction of the pressure roller 10, the pressure roller 10 includes a plurality of bead regions 13 arranged in sequence, the outer peripheral surfaces of the roller body 11 in each bead region 13 are coplanar, and the heights of the rolling parts 12 of at least two of the plurality of bead regions 13 protruding from the outer peripheral surface of the roller body 11 are not equal; the rolling parts 12 of two adjacent bead regions 13 among the plurality of bead regions 13 form a step; along the axial direction of the pressure roller 10, the pressure roller 10 has a first end 15 and a second end 16 arranged oppositely, and pointing from the first end 15 to the second end 16, the heights of the rolling parts 12 of the plurality of bead regions 13 protruding from the outer peripheral surface of the roller body 11 increase in sequence.

[0101] By dividing the pressure roller 10 into a plurality of bead regions 13 along its axial direction, the heights of the rolling parts 12 of at least two of the plurality of bead regions 13 protruding from the outer peripheral surface of the roller body 11 are not equal, that is, when the pressure roller 10 rolls the tab 201 of the pole piece 200, embossing with different pit depths can be formed on the surfaces of different regions of the tab 201. The pressure roller 10 uses the stepped rolling part 12 to perform differential rolling on different regions of the tab 201, which can strengthen the strength of different regions of the tab 201 in a targeted manner, improve the overall strength of the tab 201, improve the stress distribution of the tab 201 when passing through the roller, reduce the probability of stress concentration of the tab 201 in a local area, thereby reducing the risk of the tab 201 turning over, and improving the reliability of the battery cell. In the direction pointing from the first end 15 to the second end 16, the heights of the rolling parts 12 of the plurality of bead regions 13 protruding from the outer peripheral surface of the roller body 11 increase in sequence, so as to form reinforcing ribs with gradually increasing pit depths on the tab, strengthen the corresponding regions of the tab 201 in a targeted manner, improve the strength of the tab 201, enable the tab 201 to better adapt to a complex stress environment, and reduce the risk of the tab 201 turning over.

[0102] In some embodiments, along the axial direction of the pressing roller 10, the roller pressing portion 12 includes a plurality of sub-roller pressing portions, and each rib pressing area 13 has a sub-roller pressing portion; the plurality of sub-roller pressing portions at least include at least one of a first sub-roller pressing portion 122, a second sub-roller pressing portion 123, and a third sub-roller pressing portion 124. The shapes of the reinforcing ribs in the first sub-roller pressing portion 122, the second sub-roller pressing portion 123, and the third sub-roller pressing portion 124 are different. The first sub-roller pressing portion 122 includes a plurality of first reinforcing ribs 1221. The first reinforcing ribs 1221 are strip-shaped, and the length direction of the first reinforcing ribs 1221 is parallel to the axial direction of the pressing roller 10. The plurality of first reinforcing ribs 1221 are spaced apart along the circumferential direction of the roller body 11; the sub-roller pressing portions in the plurality of rib pressing areas 13 are all the first sub-roller pressing portion 122, and the first reinforcing ribs 1221 have a first width in the circumferential direction of the pressing roller 10; pointing from the first end 15 to the second end 16, the first width of the first reinforcing ribs 1221 in the plurality of rib pressing areas 13 increases in sequence. Along the axial direction of the pressing roller 10, the extending directions of the first reinforcing ribs 1221 in the plurality of rib pressing areas 13 are located on the same straight line.

[0103] Each rib pressing area 13 has a sub-roller pressing portion. The plurality of sub-roller pressing portions at least include at least one of a first sub-roller pressing portion 122, a second sub-roller pressing portion 123, and a third sub-roller pressing portion 124. The sub-roller pressing portion of the pressing roller 10 can select the reinforcing ribs with corresponding shapes according to the actual situation, so as to specifically strengthen the strengths of different regions of the tab 201. The first reinforcing ribs 1221 are in a strip-shaped structure. After the first sub-roller pressing portion 122 presses the tab, it can provide a linear strengthening effect to the tab 201, improve the strength of the tab 201, and reduce the risk of the tab 201 being folded. Pointing from the first end 15 to the second end 16, the protruding heights of the respective sub-roller pressing portions increase in sequence, and the first width of the first reinforcing ribs 1221 increases in sequence. Thus, embossments with gradually increasing tooth depths and gradually increasing tooth widths can be formed by rolling in different regions of the tab 201, so as to specifically strengthen different regions of the tab 201, and the shaping effect of the tab 201 is better.

[0104] In some embodiments, the second sub-roller pressing portion 123 includes a plurality of second reinforcing ribs 1231. The second reinforcing ribs 1231 are polygonal, and the plurality of second reinforcing ribs 1231 are sequentially distributed along the axial and circumferential directions of the roller body 11, and two adjacent second reinforcing ribs 1231 are sequentially connected. The third sub-roller pressing portion 124 includes a plurality of third reinforcing ribs 1241. The plurality of third reinforcing ribs 1241 are distributed along the circumferential direction of the roller body 11, and two adjacent third reinforcing ribs 1241 are sequentially connected; the third reinforcing rib 1241 includes a first sub-reinforcing rib 1241a and a second sub-reinforcing rib 1241b that are connected to each other, and the first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b are arranged at an angle.

[0105] When the second reinforcing rib 1231 rolls the tab 201, it has a large contact area with the tab and a uniform stress distribution, and can be applied to the area where the tab 201 needs to bear a large pressure and the force is uniform. The third reinforcing rib 1241 includes a first sub-reinforcing rib 1241a and a second sub-reinforcing rib 1241b, and the first sub-reinforcing rib 1241a and the second sub-reinforcing rib 1241b are arranged at an angle, that is, the shape of the third reinforcing rib 1241 is generally V-shaped as a whole. After the third reinforcing rib 1241 rolls the tab, the tab has good bending and tensile resistance, and can roll the middle area of the tab 201 to improve the strength of the corresponding area of the tab.

[0106] In some embodiments, along the axial direction of the pressure roller 10, the pressure roller 10 includes a plurality of roller sections 14 arranged in sequence, and the plurality of roller sections 14 are detachably connected. The number of roller sections 14 is equal to the number of rib pressing areas 13, and each roller section 14 has a rib pressing area 13. Any one of two adjacent roller sections 14 is provided with a protrusion 141, and the other is provided with a groove 142 that cooperates with the protrusion 141. The two adjacent roller sections 14 are connected by the protrusion 141 and the groove 142.

[0107] The number of roller sections 14 in the pressure roller 10 can be selected and adjusted according to the actual shape and force distribution of the tab 201, and the shapes of the sub-rolling parts of the respective roller sections 14 in the pressure roller 10 can be matched as needed. It is only necessary to select at least one of the corresponding first sub-rolling part 122, second sub-rolling part 123 or third sub-rolling part 124, so as to combine to form a pressure roller 10 with different numbers and / or different sub-rolling part shapes. It has good flexibility, strong adjustability, and is more likely to meet the shaping requirements of the actual working conditions of the tab 201, and the application range of the pressure roller 10 is wider. By connecting the two adjacent roller sections 14 by means of the protrusion 141 and the groove 142, the installation and disassembly of the respective roller sections 14 in the pressure roller 10 are convenient and fast, can be flexibly combined, and have a wide application range.

[0108] Although the present application has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rolling device for rolling tab, characterized in that, Comprising: A pressure roller, including a roller body and a roller pressing part, wherein the roller pressing part is convexly arranged on the outer peripheral surface of the roller body along the circumferential direction of the roller body; Wherein, along the axial direction of the pressure roller, the pressure roller includes a plurality of pressing rib areas arranged in sequence, the pressure roller includes a plurality of roller sections arranged in sequence, and the plurality of roller sections are detachably connected to each other. The number of the roller sections is equal to the number of the pressing rib areas, and each roller section has one of the pressing rib areas; the outer peripheral surfaces of the roller bodies in each of the pressing rib areas are coplanar, and the heights of the roller pressing parts of at least two of the plurality of pressing rib areas protruding from the outer peripheral surface of the roller body are not equal.

2. The roll pressing device according to claim 1, characterized in that, Steps are formed between the roller pressing parts of two adjacent pressing rib areas among the plurality of pressing rib areas; along the axial direction of the pressure roller, the pressure roller has a first end and a second end arranged oppositely. Pointing from the first end to the second end, the heights of the roller pressing parts of the plurality of pressing rib areas protruding from the outer peripheral surface of the roller body increase in sequence.

3. The roll pressing device according to claim 2, characterized in that, Along the axial direction of the pressure roller, the roller pressing part includes a plurality of sub-roller pressing parts, and each pressing rib area has one of the sub-roller pressing parts; The plurality of sub-roller pressing parts at least include at least one of a first sub-roller pressing part, a second sub-roller pressing part, and a third sub-roller pressing part, and the shapes of the reinforcing ribs in the first sub-roller pressing part, the second sub-roller pressing part, and the third sub-roller pressing part are different.

4. The roll pressing device according to claim 3, characterized in that, The first sub-roller pressing part includes a plurality of first reinforcing ribs, the first reinforcing ribs are strip-shaped, the length direction of the first reinforcing ribs is parallel to the axial direction of the pressure roller, and the plurality of first reinforcing ribs are spaced apart along the circumferential direction of the roller body.

5. The roll pressing device according to claim 4, characterized in that, The sub-roller pressing parts in the plurality of pressing rib areas are all the first sub-roller pressing parts, and the first reinforcing ribs have a first width in the circumferential direction of the pressure roller; pointing from the first end to the second end, the first widths of the first reinforcing ribs in the plurality of pressing rib areas increase in sequence.

6. The roll pressing device according to claim 5, characterized in that, Along the axial direction of the pressure roller, the extending directions of the first reinforcing ribs in the plurality of pressing rib areas are located on the same straight line.

7. The roll pressing device according to claim 3, characterized in that, The second sub-roller pressing part includes a plurality of second reinforcing ribs, the second reinforcing ribs are polygonal, the plurality of second reinforcing ribs are sequentially distributed along the axial and circumferential directions of the roller body, and two adjacent second reinforcing ribs are sequentially connected.

8. The rolling device according to claim 3, characterized in that, The third sub-roller pressing part includes a plurality of third reinforcing ribs, the plurality of third reinforcing ribs are distributed along the circumferential direction of the roller body, and two adjacent third reinforcing ribs are sequentially connected; the third reinforcing rib includes a first sub-reinforcing rib and a second sub-reinforcing rib connected to each other, and the first sub-reinforcing rib and the second sub-reinforcing rib are arranged at an angle.

9. The roll pressing device according to claim 1, wherein Protrusions are arranged on any one of two adjacent roller sections, and grooves matching the protrusions are arranged on the other one. The two adjacent roller sections are connected through the protrusions and the grooves.

10. A battery manufacturing device, characterized in that, Including the roller pressing device according to any one of claims 1-9.

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