Battery cell skirt reverse folding mechanism
By designing the battery cell skirt folding mechanism, using the coordination and guidance system of the upper and middle knife, the problem of poor folding of the ultra-thin battery cell of lithium batteries is solved, and high-precision, stability and low-cost battery cell processing is achieved.
Patent Information
- Application Number
- CN202422043239.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In the manufacturing of lithium batteries, especially in the bifold edge process of ultra-thin battery cells, it is difficult to ensure the consistency of the folded edge width, and it is prone to defective phenomena such as scratches, waves and whitening, and it is difficult to be compatible with high hardness and ultra-large-sized battery cells.
A battery-cell skirt reversing mechanism is adopted, including an upper knife and a middle knife. By adjusting the spacing between the upper knife and the deep pit surface of the battery-cell skirt and the rotation axis design of the middle knife, it is combined with the guide plate and the driving component to ensure the folding accuracy and stability, and form an accurate preliminary crease.
It has achieved compatibility with high hardness, soft body, and ultra-large-sized battery cells, good folding quality, avoid bad phenomena, high processing accuracy, easy use, almost no debugging, low cost, stable and reliable production.
Smart Images
Figure CN223145690U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cell skirt edge folding, and specifically, to a cell skirt edge folding mechanism. Background Art
[0002] The double-edge folding dispenser is a double-edge folding and dispensing device for lithium-ion batteries, including a battery conveying mechanism and a skirt edge shaping mechanism, a positioning mechanism, a trimming mechanism, a first folding mechanism, a dispensing mechanism, a second folding mechanism, a hot and cold ironing mechanism, and a finishing mechanism on both sides, which are arranged in sequence from front to back. There are two such mechanisms, which are symmetrically arranged on the left and right sides of the battery transplanting mechanism respectively. The fixture clamps the cell and moves back and forth in a zigzag shape to complete all workstations.
[0003] In the lithium battery manufacturing process, one of the very important processes is to fold the skirt edges on both sides of the cell once. The control of the folding accuracy CPK is very strict. The one-fold edge technology is to flip the 2-mm skirt edge by 180° to form a double-fold edge. The original technology uses the method of gradually changing the angle of the roller for one-fold edge. With the improvement of the cell packaging technology, the skirt edge is getting harder and thicker, and the cell is getting longer. The roller folding method will cause the inconsistency of the folding width and the appearance defects.
[0004] Currently, the trend is towards ultra-thin cells, which have a wide range of applications. For an ultra-thin cell with a thickness of 1 mm, when performing the double-fold edge process, it will exceed the main body, resulting in the folding height on both sides being higher than the cell thickness and the size not meeting the specifications. Summary of the Utility Model
[0005] The utility model provides a cell skirt edge folding mechanism, which can overcome certain or some defects of the prior art.
[0006] According to a cell skirt edge folding mechanism of the utility model, it includes a device main body, and the device main body includes an upper knife and a middle knife; the upper knife has a first mating surface for mating with the inner part of the deep pit surface of the cell skirt edge, and the middle knife has a second mating surface for mating with the outer part of the deep pit surface of the cell skirt edge;
[0007] The middle knife is rotatably arranged relative to the upper knife, and the rotation axis of the middle knife is located at the dividing line between the inner part and the outer part of the deep pit surface; the second mating surface can act on the outer part of the deep pit surface to complete the fitting of the outer part of the shallow pit surface of the cell skirt edge to the inner part of the shallow pit surface of the cell skirt edge.
[0008] Preferably, there is an inner cavity in the device main body, an opening is formed at the side wall of the inner cavity, the upper knife is detachably arranged at the top of the opening, and an overall lifting servo is arranged at the bottom of the device main body, and the overall lifting servo is used to adjust the height of the device main body to adjust the distance between the upper knife and the deep pit surface of the cell skirt edge.
[0009] With the above structure, the distance between the upper knife and the deep pit surface of the cell skirt can be adjusted, improving the processing accuracy.
[0010] Preferably, a guiding plate is arc-shaped arranged in the inner cavity. The guiding plate has an inwardly concave arc portion. A middle knife rotating seat is arranged at the guiding plate and rotates along the arc portion. The middle knife is detachably arranged at the middle knife rotating seat.
[0011] With the above structure, the arc-shaped guiding plate provides a smooth guiding path for the middle knife rotating seat, helping to ensure that the middle knife rotating seat can stably move along the predetermined trajectory during the processing, reducing the possibility of deviation and shaking, and thus improving the processing accuracy.
[0012] Preferably, a through groove with the same radian as the guiding plate is formed at the side wall of the inner cavity. Connecting rods penetrating through the through groove are fixedly arranged at both ends of the middle knife rotating seat.
[0013] With the above structure, the sliding stability of the middle knife rotating seat at the guiding plate is further improved.
[0014] Preferably, a driving assembly is arranged on the device main body. The driving assembly includes a linear guide slidably arranged at the side wall of the device main body and a middle knife servo. A guiding member is slidably arranged at the linear guide. A sliding groove is formed along the length direction of the guiding member. Bearings slidably arranged in the sliding groove are sleeved on the connecting rods; the middle knife servo is used to provide the power for the middle knife rotating seat to rotate along the guiding plate.
[0015] With the above structure, the linear guide provides an accurate guiding path for the guiding member, ensuring the stable sliding of the guiding member on the side wall of the device main body, reducing the friction and shaking during the movement, improving the stability and reliability of the system. At the same time, the combination of the sliding groove on the guiding member and the bearings on the connecting rods further ensures the smoothness and accuracy of the movement.
[0016] Preferably, the first mating surface is inclined towards the middle knife, the second mating surface is inclined towards the upper knife, and the first mating surface and the second mating surface are perpendicular to each other.
[0017] With the above structure, the cell skirt can be better folded back.
[0018] Preferably, a lower knife is slidably arranged at the bottom of the opening part. The lower knife is arranged corresponding to the upper knife. The lower knife and the upper knife are used to form a preliminary crease at the boundary between the outer part and the inner part of the shallow pit surface of the cell skirt.
[0019] With the above structure, the lower knife and the upper knife are correspondingly arranged and work together to form a preliminary crease at the boundary line between the outer part and the inner part of the shallow pit surface of the cell skirt, providing a clear positioning and reference line for subsequent bending, improving the processing accuracy. At the same time, due to the formed preliminary crease, the cell skirt is more likely to deform during subsequent bending, thus improving the processing efficiency.
[0020] Preferably, a lower knife servo is provided at [a certain position], and the lower knife is arranged at the output end of the lower knife servo. The lower knife servo is used to provide the power for the up-and-down movement of the lower knife in the vertical direction.
[0021] With the above structure, precise adjustment of the position of the lower knife can be achieved, ensuring that the lower knife can accurately contact the shallow pit surface of the cell skirt during processing and cooperate with the upper knife to form a preliminary crease.
[0022] Preferably, the lower knife has a third mating surface with the inner part of the shallow pit surface of the cell skirt, and the third mating surface is arranged parallel to the first mating surface.
[0023] With the above structure, the parallel arrangement of the third mating surface and the first mating surface ensures the precise cooperation between the lower knife and the middle knife during processing, helping to reduce deviations and errors during processing and improving the processing accuracy.
[0024] Preferably, a butting portion is formed at the contact end of the first mating surface and the second mating surface. The butting portion is used to provide a force for forming a preliminary crease at the boundary line between the outer part and the inner part of the shallow pit surface of the cell skirt. A groove perpendicular to the first mating surface is formed between the butting portion and the first mating surface. The groove is used to provide a bending space for the bending part at the boundary line between the inner part and the outer part of the deep pit surface.
[0025] With the above structure, the accuracy and consistency of crease formation are ensured, providing an accurate reference line for subsequent processing steps. At the same time, the groove formed between the butting portion and the first mating surface, whose direction is perpendicular to the first mating surface, cleverly provides a necessary bending space for the bending part at the boundary line between the inner part and the outer part of the deep pit surface of the cell skirt, helping to reduce the resistance and stress concentration during bending, thus improving the smoothness of bending and the processing quality.
[0026] The beneficial effects of the present utility model are as follows:
[0027] Compared with the prior art, the structure of the present disclosure fully simulates the principle of process forming, has a wider application range, is applicable to those with higher hardness, softer body, extra-large size, etc., is compatible with conventional battery cells and ultra-thin battery cells, has good hemming quality, consistent hemming width, can effectively avoid defects such as scratches, waves, and white abrasions. At the same time, it is easy to use, hardly needs to be debugged again during use, only needs to change the servo parameters, has a short one-time forming time, does not affect the overall machine efficiency, is stable and reliable in production, has a simple structure and principle, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 FIG. is an overall structural schematic diagram of a battery cell skirt hemming mechanism.
[0029] Figure 2 FIG. is a structural schematic diagram of the upper knife, middle knife and lower knife of a battery cell skirt hemming mechanism.
[0030] Figure 3 FIG. is an overall front view structural schematic diagram of a battery cell skirt hemming mechanism.
[0031] Figure 4 FIG. is an overall side view sectional structural schematic diagram of a battery cell skirt hemming mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0032] To further understand the content of the present invention, the present invention will be described in detail in combination with the embodiments. It should be understood that the embodiments are only for explaining the present invention rather than limiting it.
[0033] Embodiment 1
[0034] Please refer to Figure 1-2 , this embodiment provides a battery cell skirt hemming mechanism, which includes a device main body 100. The device main body 100 includes an upper knife 110 and a middle knife 120; the upper knife 110 has a first mating surface 210 for mating with the inner part of the deep pit surface of the battery cell skirt, and the middle knife 120 has a second mating surface 220 for mating with the outer part of the deep pit surface of the battery cell skirt;
[0035] The middle knife 120 is rotatably arranged relative to the upper knife 110, and the rotation axis of the middle knife 120 is located at the boundary line between the inner part of the deep pit surface and the outer part of the deep pit surface; the second mating surface 220 can act on the outer part of the deep pit surface to complete the fitting of the outer part of the shallow pit surface of the battery cell skirt to the inner part of the shallow pit surface of the battery cell skirt.
[0036] When the utility model is in use, the battery cell is clamped by a fixture. Before the fixture is transplanted to the present folding mechanism, after the skirt of the battery cell is in place, the overall lifting servo 310 lowers the device main body 100, causing the upper knife 110 to descend to a specified position and touch the skirt. The lower knife 150 rises to squeeze the skirt against the upper knife 110 to form a preliminary crease. At this time, the skirt has been placed on the middle knife 120. The middle knife 120 rotates the skirt by a certain angle. Then the lower knife 150 retracts, and the middle knife 120 continues to rotate the skirt by an angle to 160°. After maintaining pressure for a certain period of time, the middle knife 120 resets, and the upper knife 110 resets, and the reverse folding is completed.
[0037] Compared with the prior art, the structure and action of the present disclosure fully simulate the process forming principle, with a wider application range, applicable to those with higher hardness, softer body, extra-large size, etc., compatible with conventional battery cells and ultra-thin battery cells, good hemming quality, consistent hemming width, effectively avoiding defects such as scratches, waves, and white abrasions. At the same time, it is convenient to use, hardly requires re-adjustment during use, only needs to change the servo parameters, short one-time forming time, does not affect the overall machine efficiency, stable and reliable production, simple structure and principle, and low cost.
[0038] In this embodiment, the device main body 100 has an inner cavity, and an opening is formed at the side wall of the inner cavity. The upper knife 110 is detachably arranged at the top of the opening. The overall lifting servo 310 is arranged at the bottom of the device main body 100, and the overall lifting servo 310 is used to adjust the height of the device main body 100 to adjust the distance between the upper knife 110 and the deep pit surface of the skirt of the battery cell.
[0039] Through the above structure, the distance between the upper knife 110 and the deep pit surface of the skirt of the battery cell can be adjusted, improving the processing accuracy.
[0040] In this embodiment, a guide plate 420 with an arc-shaped setting is arranged in the inner cavity. The guide plate 420 has an inwardly concave arc portion. A middle knife rotating seat 410 that rotates along the arc portion is arranged at the guide plate 420. The middle knife 120 is detachably arranged at the middle knife rotating seat 410.
[0041] Through the above structure, the arc-shaped guide plate 420 provides a smooth guiding path for the middle knife rotating seat 410, helping to ensure that the middle knife rotating seat 410 can stably move along the predetermined trajectory during processing, reducing the possibility of deviation and shaking, thereby improving the processing accuracy.
[0042] In this embodiment, a through groove having the same radian as the guide plate 420 is formed at the side wall of the inner cavity. Connecting rods penetrating the through groove are fixedly arranged at both ends of the middle knife rotating seat 410.
[0043] Through the above structure, the sliding stability of the middle knife rotating seat 410 at the guide plate 420 is further improved.
[0044] In this embodiment, a driving assembly is provided at the device main body 100. The driving assembly includes a linear guide rail 130 slidably disposed on the side wall of the device main body 100 and a middle knife servo 430. A guiding member is slidably disposed on the linear guide rail 130. A sliding groove is formed in the guiding member along the length direction. Bearings 140 are sleeved on the connecting rods and are slidably disposed in the sliding groove; the middle knife servo 430 is used to provide the power for the middle knife rotating seat 410 to rotate along the guiding plate 420.
[0045] With the above structure, the linear guide rail 130 provides an accurate guiding path for the guiding member, ensuring the stable sliding of the guiding member on the side wall of the device main body 100, reducing friction and shaking during movement, improving the stability and reliability of the system. At the same time, the combination of the sliding groove on the guiding member and the bearings 140 on the connecting rods further ensures the smoothness and accuracy of the movement.
[0046] In this embodiment, the first mating surface 210 is inclined towards the middle knife 120, the second mating surface 220 is inclined towards the upper knife 110, and the first mating surface 210 and the second mating surface 220 are perpendicular to each other.
[0047] With the above structure, better reverse folding of the cell skirt can be achieved.
[0048] Embodiment 2
[0049] As shown in Figure 1-4 , this embodiment also provides a cell skirt reverse folding mechanism, which is different from Embodiment 1 in that: a lower knife 150 is slidably disposed at the bottom of the opening part. The lower knife 150 is correspondingly arranged with the upper knife 110. The lower knife 150 and the upper knife 110 are used to form a preliminary crease at the boundary line between the outer part and the inner part of the shallow pit surface of the cell skirt.
[0050] With the above structure, the lower knife 150 and the upper knife 110 are correspondingly arranged and work together to form a preliminary crease at the boundary line between the outer part and the inner part of the shallow pit surface of the cell skirt, providing a clear positioning and reference line for subsequent bending, improving the processing accuracy. At the same time, through the formed preliminary crease, the cell skirt is more likely to deform during subsequent bending, thus improving the processing efficiency.
[0051] In this embodiment, a lower knife servo 160 is provided at 100. The lower knife 150 is disposed at the output end of the lower knife servo 160. The lower knife servo 160 is used to provide the power for the lower knife 150 to move up and down in the vertical direction.
[0052] With the above structure, accurate adjustment of the position of the lower knife 150 can be achieved, ensuring that the lower knife can accurately contact the shallow pit surface of the cell skirt during processing and cooperate with the upper knife 110 to form a preliminary crease.
[0053] In this embodiment, the lower cutter 150 has a third mating surface 230 on the inner side of the shallow pit surface of the cell skirt, and the third mating surface 230 is arranged parallel to the first mating surface 210.
[0054] With the above structure, the parallel arrangement of the third mating surface 230 and the first mating surface 210 ensures the precise cooperation between the lower cutter 150 and the middle cutter 120 during the processing, which helps to reduce the deviation and error during the processing and improve the processing accuracy.
[0055] In this embodiment, an abutting portion 240 is formed at the contact end of the first mating surface 210 and the second mating surface 220. The abutting portion 240 is used to provide a force for forming a preliminary crease at the boundary line between the outer side of the shallow pit surface of the cell skirt and the inner side of the shallow pit surface of the cell skirt. A groove perpendicular to the first mating surface 210 is formed between the abutting portion 240 and the first mating surface 210. The groove is used to provide a bending space for the bending portion at the boundary line between the inner side and the outer side of the deep pit surface.
[0056] Among them, the distance between the first mating surface 210 and the abutting portion 240 is equal to twice the thickness of the skirt.
[0057] With the above structure, the accuracy and consistency of the crease formation are ensured, providing an accurate reference line for the subsequent processing steps. At the same time, the groove formed between the abutting portion 240 and the first mating surface 210, whose direction is perpendicular to the first mating surface 210, cleverly provides a necessary bending space for the bending portion at the boundary line between the inner side and the outer side of the deep pit surface of the cell skirt, which helps to reduce the resistance and stress concentration during the bending process, thereby improving the smoothness of the bending and the processing quality.
[0058] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application based on one or several embodiments provided by the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.
[0059] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the embodiments is only part of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative work without departing from the creative purpose of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. A cell skirt folding mechanism, characterized in that, It includes a device main body (100), and the device main body (100) includes an upper knife (110) and a middle knife (120); the upper knife (110) has a first mating surface (210) for mating with the inner part of the deep pit surface of the cell skirt, and the middle knife (120) has a second mating surface (220) for mating with the outer part of the deep pit surface of the cell skirt; The middle knife (120) is rotatably arranged relative to the upper knife (110), and the rotation axis of the middle knife (120) is located at the dividing line between the inner part of the deep pit surface and the outer part of the deep pit surface; the second mating surface (220) can act on the outer part of the deep pit surface to complete the fitting of the outer part of the shallow pit surface of the cell skirt to the inner part of the shallow pit surface of the cell skirt.
2. The edge folding mechanism for battery cells according to claim 1, characterized in that: There is an inner cavity in the device main body (100), and an opening is formed at the side wall of the inner cavity. The upper knife (110) is detachably arranged at the top of the opening. A whole lifting servo (310) is provided at the bottom of the device main body (100), and the whole lifting servo (310) is used to adjust the height of the device main body (100) to adjust the distance between the upper knife (110) and the deep pit surface of the cell skirt.
3. The cell skirt folding mechanism according to claim 2, characterized in that: A guiding plate (420) arranged in an arc shape is provided in the inner cavity. The guiding plate (420) has an inwardly concave arc portion. A middle knife rotating seat (410) rotating along the arc portion is provided on the guiding plate (420), and the middle knife (120) is detachably arranged at the middle knife rotating seat (410).
4. A cell skirt folding mechanism according to claim 1, characterized in that: A through groove having the same radian as the guiding plate (420) is formed at the side wall of the inner cavity. Connecting rods penetrating through the through groove are fixedly provided at both ends of the middle knife rotating seat (410).
5. The edge folding mechanism of an electric core according to claim 1, wherein: A driving assembly is provided on the device main body (100). The driving assembly includes a linear guide rail (130) slidably arranged at the side wall of the device main body (100) and a middle knife servo (430). A guiding member is slidably arranged on the linear guide rail (130). A sliding groove is formed along the length direction of the guiding member. Bearings (140) slidably arranged in the sliding groove are sleeved on the connecting rods; the middle knife servo (430) is used to provide the power for the middle knife rotating seat (410) to rotate along the guiding plate (420).
6. The cell skirt folding mechanism according to claim 1, characterized in that: The first mating surface (210) is inclined towards the middle knife (120), the second mating surface (220) is inclined towards the upper knife (110), and the first mating surface (210) and the second mating surface (220) are perpendicularly arranged.
7. The edge folding mechanism for battery cells according to claim 2, characterized in that: A lower knife (150) is slidably arranged at the bottom of the opening. The lower knife (150) is correspondingly arranged with the upper knife (110). The lower knife (150) and the upper knife (110) are used to form a preliminary crease at the dividing line between the outer part and the inner part of the shallow pit surface of the cell skirt.
8. A cell skirt folding-back mechanism according to claim 7, characterized in that: A lower knife servo (160) is provided on the (100). The lower knife (150) is arranged at the output end of the lower knife servo (160), and the lower knife servo (160) is used to provide the power for the lower knife (150) to move up and down in the vertical direction.
9. The edge folding mechanism for battery cells according to claim 7, wherein: The lower knife (150) has a third mating surface (230) with the inner part of the shallow pit surface of the cell skirt, and the third mating surface (230) is parallel to the first mating surface (210).
10. A cell skirt folding mechanism according to claim 9, characterized in that: A contact end of the first mating surface (210) and the second mating surface (220) is formed with an abutting portion (240). The abutting portion (240) is used to provide a force for forming a preliminary crease at the boundary line between the outer side portion and the inner side portion of the shallow pit surface of the cell skirt. A groove perpendicular to the first mating surface (210) is formed between the abutting portion (240) and the first mating surface (210). The groove is used to provide a bending space for the bending portion at the boundary line between the inner side portion and the outer side portion of the deep pit surface.