Pole lug pre-folding mechanism

Abstract

The utility model discloses a tab pre-folding mechanism, and relates to the technical field of tabs. The pole piece bending device specifically comprises a bending roller, at least one rolling piece and at least one bending piece, and the bending roller is arranged below a pole piece; the at least one rolling part is arranged above the pole piece, each rolling part comprises a compression roller, and the pole piece is rolled between the bending roller and the compression roller; the at least one bending piece is connected to the end part of the bending roller and is close to one side of the tab in the pole piece conveying direction, and the outer ring surface of the bending piece is attached to and bends the tab of the pole piece. The tab is gradually bent towards the direction needing to be bent, it is ensured that the position of the pole piece is kept stable during rolling, and therefore it is ensured that the tab can be precisely attached and bent along a set track in the bending process. The bending direction and angle of the tab are ensured, the synergistic effect of multiple components is not needed, the tab pre-bending efficiency is improved, meanwhile, the tab is bent according to the track, and the risk that the tab protrudes outwards is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of electrode technology, and in particular to an electrode pre-folding mechanism. Background Technology

[0002] A tab pre-bending mechanism is a device used in the battery production process to pre-bend the tabs of battery cells. It is mainly used in the manufacturing process of lithium batteries and other battery cells, and its purpose is to pre-bend and shape the tabs before subsequent processing steps such as welding and assembly to meet the requirements of subsequent processes.

[0003] In existing technologies, pre-bending mechanisms are equipped with specialized pre-bending components, such as pressure plates, support columns, and clamping cylinders. Through the coordinated action of these components, the tabs are pre-pressed and pre-bent before the formal bending operation. This method can improve the quality and consistency of bending to a certain extent and reduce problems in subsequent processes.

[0004] However, the above solution still has some shortcomings. When it is necessary to adjust the bending angle of the tabs, multiple components need to work together to pre-compress and bend the tabs. This process not only increases the debugging time and material costs, but also causes the tabs to bulge outwards. Especially when the tabs vibrate, the bulging tabs pose a risk of inverting and inserting into the separator, causing a short circuit in the core. This short circuit will directly affect the battery's performance and safety, increasing product safety risks.

[0005] Therefore, this application aims to solve the problem of low pre-folding efficiency of the electrode tabs while also avoiding the problem of electrode tabs bulging outwards. Utility Model Content

[0006] The main purpose of this invention is to provide a tab pre-folding mechanism, which aims to improve the efficiency of tab pre-folding and avoid the problem of tab bulging outward after pre-folding.

[0007] To achieve the above objectives, this utility model proposes a pre-folding electrode lug mechanism, comprising:

[0008] The bending roller is positioned below the electrode sheet;

[0009] At least one roller is positioned above the electrode sheet, each of the rollers comprising a pressure roller, wherein the electrode sheet is subjected to roller pressure between the bending roller and the pressure roller;

[0010] At least one bending element is connected to the end of the bending roller, and is located on the side of the electrode tab along the electrode sheet conveying direction. The outer ring surface of the bending element is attached to the electrode tab of the bent electrode sheet.

[0011] In the above scheme, bending rollers and pressure rollers work together to roll the electrode sheet. During the rolling and conveying process, the tabs on the side of the electrode sheet sequentially approach the bending component, causing the bending component to gradually conform to the tabs. The outer wall of the bending component is pressed towards the direction of the required bending of the tab, gradually bending the tab to the desired angle. This pre-bending effect ensures the electrode sheet remains stable during rolling, guaranteeing precise contact and bending along the set trajectory during bending. This ensures the bending direction and angle of the tabs without the need for multiple components working together, improving the efficiency of tab pre-bending and effectively avoiding the risk of tab bulging.

[0012] Furthermore, the outer wall of the bent component has several spaced annular grooves. These grooves provide redundant space for bending the tab and serve as a guide path during bending, ensuring that the tab bends in a predetermined direction and angle. This further optimizes the pre-bending process and reduces unnecessary material stress.

[0013] Furthermore, the outer wall of the bent component is provided with threaded protrusions, which are staggered with the annular grooves. The major diameter of the threaded protrusions gradually increases along the bending direction of the electrode tab. The design of the threaded protrusions not only increases the friction during bending but also provides additional support, ensuring that the electrode tab is not easily slipped during bending. Through the staggered arrangement of the threaded protrusions and annular grooves, the electrode tab can obtain a more uniform force distribution during bending, further improving the stability and accuracy of the bending effect.

[0014] Furthermore, the end of the bending roller is provided with an assembly groove, and the bending component is installed in the assembly groove.

[0015] Furthermore, the roller pressing component includes a roller pressing frame, with the pressure roller connected to the roller pressing frame, or both the pressure roller and the bending roller are connected to the roller pressing frame.

[0016] Furthermore, the roller press frame is connected to a telescopic component, the output end of which is connected to the pressure roller and drives the pressure roller to move closer to or away from the bending roller.

[0017] Furthermore, when there are two roller pressing components and two roller pressing components, the two roller pressing components are respectively placed at both ends of the bending roller and are correspondingly arranged with the bending components on the corresponding sides.

[0018] Furthermore, it includes a photoelectric detection component, which is placed in the pre-bending process of the electrode sheet, and the photoelectric detection component includes photoelectric sensors placed on the upper and lower sides of the electrode sheet.

[0019] Furthermore, the photoelectric detection component includes a connecting frame, one end of which is connected to the photoelectric sensor, and the other end of which is slidably connected to an adjustment frame along a conveying direction perpendicular to the tab.

[0020] Furthermore, the adjustment bracket includes:

[0021] support;

[0022] A support base is connected to the side of the bracket facing the electrode.

[0023] The movable block slides between two adjacent support seats and is connected to the connecting frame.

[0024] The above technical solution has the following advantages:

[0025] This invention employs a combination of bending rollers and pressure rollers to roll the electrode sheet through the gap between them. Simultaneously, a bending element at the end of the bending roller folds and bends the electrode tab, gradually oriented towards the desired bending direction. This ensures the electrode sheet remains stable during rolling, guaranteeing precise contact and bending along a predetermined trajectory during the bending process. This ensures the bending direction and angle of the electrode tab are accurately controlled, eliminating the need for multiple components and improving the efficiency of pre-bending. Furthermore, the design of the bending element matches the electrode tab, ensuring it bends along the designated trajectory and effectively preventing the risk of outward bulging.

[0026] Several annular grooves are provided on the bent part to ensure that the creases are uniform and firm; the annular grooves can also provide redundant space for the bending of the tab and serve as a guide path when bending the tab, ensuring that the tab is bent in the predetermined direction and angle, which can further optimize the pre-bending process and reduce unnecessary material stress. Attached Figure Description

[0027] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0030] Figure 3 This is a partial structural schematic diagram of the present invention;

[0031] Figure 4 This is a schematic diagram of the electrode structure of this utility model.

[0032] In the diagram: 1. Electrode; 11. Positive electrode tab; 12. Negative electrode tab; 2. Adjustment frame; 21. Bracket; 22. Support base; 23. Moving block; 3. Photoelectric detection component; 31. Connecting frame; 32. Photoelectric sensor; 4. Roller pressing component; 41. Roller pressing frame; 42. Telescopic component; 43. Pressure roller; 5. Bending component; 51. Threaded protrusion; 52. Annular groove; 6. Bending roller; 61. Assembly groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0034] like Figure 1 and Figure 2 As shown, an electrode tab pre-folding mechanism includes a bending roller 6, at least one roller pressing member 4, and at least one bending member 5. The bending roller 6 is positioned below the electrode sheet 1; at least one roller pressing member 4 is positioned above the electrode sheet 1, and each roller pressing member 4 includes a pressure roller 43. The electrode sheet 1 is subjected to roller pressing between the bending roller 6 and the pressure roller 43; at least one bending member 5 is connected to the end of the bending roller 6 and is positioned close to the electrode tab along the conveying direction of the electrode sheet 1. The outer ring surface of the bending member 5 is attached to and bends the electrode tab of the electrode sheet 1. The bending roller 6 and the pressing component 4 cooperate with each other, so that a gap is reserved between the pressing roller 43 and the bending roller 6 in the pressing component 4 for the electrode sheet 1 to pass through. When the electrode sheet 1 is conveyed through this gap, the bending roller 6 and the pressing roller 43 jointly perform the pressing operation on the electrode sheet 1. During the pressing and conveying process, the electrode tabs on the side of the electrode sheet 1 approach the bending component 5 in turn, so that the bending component 5 gradually fits the electrode tabs. The outer wall of the bending component 5 is squeezed towards the direction of the electrode tab to be bent, so that the electrode tab is gradually bent to form the required angle, thus completing the pre-bending effect of the electrode tabs in turn.

[0035] Specifically, when there are two roller pressing elements 4 and two pressure roller pressing elements 4, the two roller pressing elements 4 are respectively placed at both ends of the bending roller 6 and are correspondingly set with the bending elements 5 on the corresponding sides. The length of the bending roller 6 is at least twice that of the pressure roller 43, so that the bending elements 5 can be installed at both ends of a single bending roller 6, and the bending elements 5 at each end can be used in conjunction with the pressure roller 43, which can improve the overall space utilization and the efficiency of the electrode sheet 1. In addition, multiple sets of bending rollers 6 can be arranged coaxially, and the pressure rollers 43 can be arranged sequentially at one or both ends of the bending roller 6 as needed.

[0036] like Figure 2 and Figure 3As shown, the outer wall of the bent part 5 has a number of spaced annular grooves 52. The bent part 5 can be hollow or solid and is annular. The cross-section of the upper half of the bent part 5 is trapezoidal, triangular, semi-circular or zigzag. When the cross-section of the bent part 5 is trapezoidal, the tab contacts the lower part of the trapezoid, causing the tab to be gradually squeezed and bent upwards. Under the combined action of the bending roller 6 and the pressure roller 43, a crease is formed on the tab at the lower part of the trapezoid. When the cross-section of the bent part 5 is triangular, a crease is gradually formed on the tab at the apex of the triangle, thus performing a bending operation on the tab. When the cross-section of the bent part 5 is semi-circular, a crease is formed at the front of the contact point between the tab and the semi-circle, thus performing a bending operation on the tab. When the cross-section of the bent part 5 is zigzag, the zigzag shape can be formed by two protrusions with a slope from high to low. The specific folding position of the tab can be selected according to different shapes as needed. Multiple annular grooves 52 are provided at intervals on the bent parts 5 with different shapes, so that the tab forms a stable crease at the annular grooves 52, enhancing the bending effect. The depth and spacing of the annular grooves 52 can be adjusted according to the thickness of the tab to ensure that the creases are uniform and firm; the annular grooves 52 can also provide redundant space for bending the tab and serve as a guide path when bending the tab to ensure that the tab bends in the predetermined direction and angle.

[0037] like Figure 2 and Figure 3 As shown, the outer wall of the bent part 5 is provided with threaded protrusions 51, which are staggered with the annular grooves 52. The major diameter of the threaded protrusions 51 gradually increases along the bending direction of the electrode tab 1. The design of the threaded protrusions 51 not only increases the friction during the bending process, but also provides additional support to ensure that the electrode tab is not easily slipped during bending. Through the staggered layout of the threaded protrusions 51 and the annular grooves 52, the electrode tab can obtain a more uniform force distribution during bending, further improving the stability and accuracy of the bending effect. In addition, the incremental design of the threaded protrusions 51 also allows the electrode tab to better adapt to the needs of different angles during the gradual bending process, thereby achieving more precise bending control.

[0038] like Figure 3 As shown, the end of the bending roller 6 has an assembly groove 61, and the bending part 5 is installed in the assembly groove 61. The depth of the assembly groove 61 matches the thickness of the bending part 5 to ensure a firm installation. The bending part 5 can be fixed in the assembly groove 61 by tightening with threads. The tightening force of the threads ensures that the bending part 5 and the bending roller 6 are tightly connected to prevent loosening. The design of the assembly groove 61 also facilitates the quick replacement of the bending part 5, adapting to the bending requirements of different tabs and improving production efficiency. In addition, the bending roller 6 can also be fixed in the assembly groove 61 by clamping. For example, the inner wall of the assembly groove 61 has a locking groove, which cooperates with the buckle on the bending part 5 to form a firm locking structure, ensuring that the bending part 5 remains stable during high-speed operation.

[0039] like Figure 1 and Figure 2 As shown, the rolling element 4 includes a rolling frame 41, with a pressure roller 43 connected to the rolling frame 41, or both the pressure roller 43 and the bending roller 6 are connected to the rolling frame 41. The rolling frame 41 is made of high-strength material to ensure the stability and durability of the overall structure. The rolling frame 41 is U-shaped, and the top of the rolling frame 41 can be directly connected to the pressure roller 43, allowing the pressure roller 43 to approach the electrode 1 from the top of the rolling frame 41. At the same time, the bottom of the rolling frame 41 is horizontally connected to the bending roller 6, so that the bending roller 6 and the pressure roller 43 work together to perform rolling action, which is the rolling process required for conventional sheet production, thereby achieving efficient processing of the electrode 1.

[0040] like Figure 2 As shown, the roller press frame 41 is connected to a telescopic component 42. The output end of the telescopic component 42 is connected to the pressure roller 43, and drives the pressure roller 43 closer to or away from the bending roller 6. The telescopic component 42 is used to move the pressure roller 43 closer to or away from the electrode sheet 1, adjusting the roller pressure to ensure that the electrode sheet 1 achieves a uniform roller pressing effect at different thicknesses. The telescopic component 42 can be driven by a pneumatic or hydraulic cylinder. By controlling the stroke of the telescopic component 42, the contact pressure between the pressure roller 43 and the electrode sheet 1 can be precisely adjusted to adapt to the needs of electrode sheets 1 with different materials and thicknesses. The design of the telescopic component 42 also has a buffering function to reduce damage to the electrode sheet 1 caused by sudden pressure changes, further improving processing quality and efficiency. This buffering function is achieved using springs or rubber pads, effectively absorbing impact force, protecting the surface integrity of the electrode sheet 1, and extending the service life of the equipment.

[0041] like Figure 1 and Figure 2 As shown, this application includes a photoelectric detection component 3, which is placed in the pre-bending process of the electrode sheet 1. The photoelectric detection component 3 includes photoelectric sensors 32 placed on the upper and lower sides of the electrode sheet 1. By monitoring the thickness and position of the electrode sheet 1 in real time, it ensures that the electrode sheet 1 is accurately aligned during the bending process and avoids deviation. The photoelectric detection data is fed back to the control system in real time, automatically adjusting the rolling parameters, optimizing bending accuracy, and improving product quality. The photoelectric detection component 3 is seamlessly integrated with the control system to achieve real-time data processing and ensure bending accuracy.

[0042] Specifically, the photoelectric detection component 3 includes a connecting frame 31. One end of the connecting frame 31 is connected to the photoelectric sensor 32, and the other end of the connecting frame 31 is slidably connected to the adjusting frame 2 along a conveying direction perpendicular to the electrode tab. The photoelectric detection component 3 is slidably mounted on the adjusting frame 2 via the connecting frame 31. The adjusting frame 2 can be flexibly adjusted in position according to the thickness and bending angle of the electrode 1 to ensure that the photoelectric sensor 32 is always accurately aligned with the electrode 1, monitor data in real time, and optimize bending accuracy.

[0043] In one embodiment of this application, the adjustment frame 2 includes a bracket 21, a support base 22, and a movable block 23. The support base 22 is connected to the side of the bracket 21 facing the electrode 1. The movable block 23 slides between two adjacent support bases 22 and is connected to the connecting frame 31. A screw is rotatably installed between the support bases 22. The screw drives the movable block 23 to move back and forth along a direction perpendicular to the width of the electrode 1. This allows the photoelectric sensor 32 to be adjusted back and forth through the connecting frame 31, ensuring that the sensor is always aligned with the center of the electrode 1. In addition, a slide rail can be installed on the bracket 21 and used in conjunction with a cylinder or hydraulic cylinder. The movable block 23 moves along the slide rail to adjust the distance between the photoelectric sensor 32 and the electrode 1, further precisely controlling the monitoring range, improving the accuracy and stability of data acquisition, and ensuring the efficiency and precision of the bending process.

[0044] like Figure 1 , Figure 2 and Figure 4 As shown in this application, the electrode 1 can be configured with a positive electrode tab 11 and a negative electrode tab 12 on both sides respectively, so that when the electrode 1 is conveyed from the pressure roller 43 and the bending roller 6, the positive electrode tab 11 and the negative electrode tab 12 on both sides of the electrode 1 contact the bending member 5 on the corresponding side respectively, thereby forming a bending operation. Alternatively, the positive electrode tab 11 or the negative electrode tab 12 on one side of the electrode 1 can be bent independently to adapt to different process requirements.

[0045] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A tab pre-folding mechanism, characterized by, The application relates to a bending device for bending the tab of a polar sheet (1). The bending device comprises a bending roller (6) arranged below the polar sheet (1), at least one roller pressing member (4) arranged above the polar sheet (1), each roller pressing member (4) comprising a pressing roller (43), and at least one bending member (5) connected to the end of the bending roller (6) and arranged on the side of the polar sheet (1) close to the tab in the conveying direction of the polar sheet (1), the outer wall of the bending member (5) being in contact with and bending the tab of the polar sheet (1). The outer wall of the bending member (5) is provided with a plurality of ring grooves (52) arranged at intervals. The outer wall of the bending member (5) is provided with a plurality of thread convex blocks (51) arranged alternately with the ring grooves (52), the diameter of the thread convex blocks (51) gradually increasing in the bending direction of the tab of the polar sheet (1).

2. The tab pre-folding mechanism of claim 1, wherein The end of the bending roller (6) is provided with an assembly groove (61), and the bending member (5) is arranged in the assembly groove (61).

3. The tab pre-folding mechanism of claim 2, wherein The roller pressing member (4) comprises a roller pressing frame (41), the pressing roller (43) being connected to the roller pressing frame (41) or the pressing roller (43) and the bending roller (6) being connected to the roller pressing frame (41).

4. The tab pre-folding mechanism of claim 1, wherein The roller pressing frame (41) is connected to an extension member (42), the output end of the extension member (42) being connected to the pressing roller (43) and driving the pressing roller (43) to move close to or away from the bending roller (6).

5. The tab pre-folding mechanism of claim 1, wherein When the number of the roller pressing members (4) is two, the two roller pressing members (4) are arranged at the two ends of the bending roller (6) and are arranged correspondingly with the bending members (5) on the corresponding sides.

6. The tab pre-folding mechanism of claim 5, wherein The application further relates to a photoelectric detection member (3) arranged in the first step of bending the polar sheet (1), the photoelectric detection member (3) comprising photoelectric sensors (32) arranged on the upper and lower sides of the polar sheet (1).

7. The tab pre-folding mechanism of claim 1, wherein The photoelectric detection member (3) comprises a connecting frame (31), one end of the connecting frame (31) being connected to the photoelectric sensors (32), and the other end of the connecting frame (31) being slidably connected to an adjusting frame (2) in the direction perpendicular to the conveying direction of the tab.

8. The tab pre-folding mechanism of claim 1, wherein The adjusting frame (2) comprises a support frame (21), a support seat (22) connected to the side of the support frame (21) facing the polar sheet (1), and a moving block (23) slidably arranged between two adjacent support seats (22) and connected to the connecting frame (31).

9. The tab pre-folding mechanism of claim 8, wherein ​ 10. The tab pre-folding mechanism of claim 9, wherein ​ ​ ​ ​

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