A method of controlling full tab core height
By acquiring the position of the diaphragm edge at the positive end of the core using a CCD device, and calculating and controlling the moving distance and speed of the flattening or patting head, the problems of leakage of positive and negative electrode foils and fluctuation in the total height of the core during the flattening or patting process of the all-electrode core were solved, achieving consistency in core height and stability of the foil electrode dressing edge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHENGZHOU BAK BATTERY CO LTD
- Filing Date
- 2026-03-09
- Publication Date
- 2026-07-14
Smart Images
Figure CN122393350A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of lithium battery manufacturing, and specifically relates to a method for controlling the height of the all-electrode core. Background Technology
[0002] The standard method for flattening or patting the omnipolar ear core is to use the positive and negative end diaphragm edges as a reference. After the CCD grips the edge, the flattening or patting height is controlled separately (e.g., Figure 1 Due to a ±0.3mm error in the width of the full-tab electrode sheets during slitting, and fluctuations in their position within the separator after winding, the following defects exist after flattening or patting with the separator at both positive and negative ends as a reference: 1. Fluctuations in the exposure of positive and negative electrode foils, resulting in fluctuations in the total height of the core; 2. Fluctuations in the dimension from the foil edge to the electrode coating edge at both positive and negative ends of the core. Poor consistency in core height will affect subsequent processing steps such as grooving and sealing. Summary of the Invention
[0003] This invention provides a method for controlling the height of the core of the all-pole tab, which solves the technical problem of fluctuation in the total height of the core caused by the leakage of positive and negative electrode foils.
[0004] The technical solution adopted in this invention is: a method for controlling the height of the omnipolar ear core, the steps of which are as follows: S1, obtain the moving distance of the positive electrode when it is flattened or patted flat; S11, obtain the position A of the diaphragm edge at the positive end of the core, and use this position A as the reference position; S12, obtain the distance B from the positive electrode flattening or patting head to the reference position A; S13, obtain the length C of the foil exposed above the separator after the core is flattened or patted at the positive end. This length C is a preset value, set according to the process design. S14, based on steps S12 and S13, the moving distance of the positive electrode when it is flattened or patted is BC; S2, to obtain the moving distance of the negative electrode when it is flattened or patted flat; S21, obtain the distance D between the positive electrode flattening head or patting head and the negative electrode flattening head or patting head. This distance is a fixed value and is determined according to the process. S22, obtain the set total height E of the core, which is set according to the process of the core model; S23, based on steps S1, S21 and S22, obtain the moving distance F of the negative electrode when it is flattened or patted flat, F=DE-B+C; S3, after the core is clamped, the positive and negative electrode flattening heads move in a controlled manner, simultaneously flattening the positive and negative ends of the core. The moving distance of the positive electrode flattening head is BC, and its corresponding moving speed and rotation speed are preset manually; the moving distance of the negative electrode flattening head is DE-B+C, and its corresponding moving speed and rotation speed are also preset manually.
[0005] As a preferred embodiment of the present invention, the positive end diaphragm edge is an edge perpendicular to the direction of the core center axis.
[0006] As a preferred embodiment of the present invention, the location A of the positive end diaphragm edge of the core is obtained by capturing the edge using a CCD device.
[0007] As a preferred embodiment of the present invention, the processing system obtains an image of the positive end of the separator edge of the core and performs edge-grabbing processing to obtain the position A of the positive end separator edge, and uses this position A as a reference position; the distance D between the positive electrode flattening head or flattening head and the negative electrode flattening head or flattening head is determined according to the process, and this distance is fixed for a specific process and is manually set. The processing system directly obtains the distance B from the positive electrode flattening head or flattening head to the reference position A based on the reference position; the processing system obtains the manually set length C of the foil exposed to the separator after the positive end of the core is flattened or flattened, the set total height E of the core, and the distance D between the positive electrode flattening head or flattening head and the negative electrode flattening head or flattening head; the processing system calculates the moving distance of the positive electrode flattening head or flattening head and the moving distance of the positive electrode flattening head or flattening head according to steps S1 and S2; the processing system controls the positive electrode flattening head or flattening head and the positive electrode flattening head or flattening head actions respectively.
[0008] As a preferred embodiment of the present invention, the processing system controls the positive electrode flattening or patting action according to the manually set working conditions.
[0009] As a preferred embodiment of the present invention, the processing system is a PLC controller.
[0010] This invention does not change the hardware configuration of the original production line, but only changes the calculation method of the moving distance of the flattening head or the patting head. It also has only one reference position. This invention uses the edge of the positive end diaphragm as the reference position, and then calculates the moving distance of the positive end flattening head or the negative end flattening head or the patting head based on this reference position. This reduces the production line modification cost. A single reference position can avoid the fluctuation of the total core height caused by the exposure of foil material at the positive and negative ends in the prior art, improve the consistency of the core height, and improve the consistency of the distance between the foil electrode edges after the positive and negative ends are flattened or patted. This invention has strong applicability. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 This is a schematic diagram illustrating how the height of the material is obtained by kneading or flattening at the positive and negative ends in existing technologies.
[0013] Figure 2 This is a schematic diagram illustrating the height obtained by flattening or patting at the positive and negative ends of the present invention. Detailed Implementation
[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0015] This invention provides a method for controlling the height of the omnipolar ear coil, the steps of which are as follows: S1, obtain the moving distance of the positive electrode when it is flattened or patted flat; S11, obtain the position A of the diaphragm edge at the positive end of the core, and use this position A as the reference position; like Figure 2 As shown, the positive end diaphragm edge is an edge perpendicular to the central axis of the core, and the location A of the positive end diaphragm edge of the core is obtained by taking a picture with a CCD device and processing it with a processing system.
[0016] S12, obtain the distance B from the positive electrode flattening or patting head to the reference position A; once the reference position is determined, the distance B is also determined; because there is a fixed virtual reference position inside the CCD that can determine the distance between the initial position of the positive electrode flattening or patting head and A. S13, obtain the length C of the foil exposed by the separator after the core is flattened or patted at the positive end. This length C is a preset value, set according to the process design. It is entered on the production line through the operation screen, and the PLC controller obtains the set value. S14, based on steps S12 and S13, the moving distance of the positive electrode when it is flattened or patted is BC; S2, to obtain the moving distance of the negative electrode when it is flattened or patted flat; S21, obtain the distance D between the positive electrode flattening head or patting head and the negative electrode flattening head or patting head. This distance is a fixed value and is determined according to the process. The distance D between the positive electrode flattening head or patting head and the negative electrode flattening head or patting head is the initial installation distance, which is fixed. It is entered on the production line through the operation screen, and the PLC controller obtains this setting value. S22, obtain the set total height E of the core, which is set according to the process of the core model; it is entered on the production line through the operation screen, and the PLC controller obtains the set value; S23, based on steps S1, S21 and S22, obtain the moving distance F of the negative electrode when it is flattened or patted flat, F=DE-B+C; S3, after the core is clamped, the positive and negative electrode flattening heads move in a controlled manner, simultaneously flattening the positive and negative ends of the core. The moving distance of the positive electrode flattening head is BC, and its corresponding moving speed and rotation speed are preset manually; the moving distance of the negative electrode flattening head is DE-B+C, and its corresponding moving speed and rotation speed are also preset manually.
[0017] Specifically, the processing system, i.e., the PLC controller, obtains an image of the positive end diaphragm edge of the core and performs edge-grabbing processing to obtain the location A of the positive end diaphragm edge, and uses this location A as the reference position; the processing system directly obtains the distance B from the positive end flattening head or patting head to the reference position A based on the reference position; the processing system obtains the manually set length C of the foil exposed diaphragm after the positive end of the core is flattened or patted, the set total height E of the core, and the distance D between the positive end flattening head or patting head and the negative end flattening head or patting head; the processing system calculates the moving distance of the positive end flattening head or patting head and the moving distance of the positive end flattening head or patting head according to steps S1 and S2; the processing system controls the positive end flattening head or patting head and the positive end flattening head or patting head actions respectively according to the manually set working conditions, including the moving speed and the rotation speed of the flattening head or patting head.
[0018] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0019] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A method for controlling the height of the omnipolar ear winding core, characterized in that, The steps are as follows: S1, obtain the moving distance of the positive electrode when it is flattened or patted flat; S11, obtain the position A of the diaphragm edge at the positive end of the core, and use this position A as the reference position; S12, obtain the distance B from the positive electrode flattening or patting head to the reference position A; S13, obtain the length C of the foil exposed above the diaphragm after the core is flattened or patted at the positive end, the length C is a preset value; S14, based on steps S12 and S13, the moving distance of the positive electrode when it is flattened or patted is BC; S2, to obtain the moving distance of the negative electrode when it is flattened or patted flat; S21, obtain the distance D between the positive electrode and the negative electrode. S22, obtain the set total height E of the core; S23, based on steps S1, S21 and S22, obtain the moving distance F of the negative electrode when it is flattened or patted flat, F=DE-B+C; S3, after the core is clamped, the positive and negative ends of the core are flattened or patted in a controlled manner, and the action completes the flattening or patting of the positive and negative ends of the core.
2. The method for controlling the height of the omnipolar ear core according to claim 1, characterized in that, The positive end diaphragm edge is the edge perpendicular to the central axis of the core.
3. The method for controlling the height of the omnipolar ear winding core according to claim 2, characterized in that, The location A of the positive end diaphragm edge of the core is obtained by capturing the edge using a CCD device.
4. The method for controlling the height of the all-pole ear core according to any one of claims 1-3, characterized in that, The processing system obtains an image of the positive end of the diaphragm edge of the core and performs edge-grabbing processing to obtain the location A of the positive end diaphragm edge, and uses this location A as the reference position; the processing system directly obtains the distance B from the positive end flattening head or patting head to the reference position A based on the reference position; the processing system obtains the manually set length C of the foil exposed diaphragm after the positive end of the core is flattened or patted, the set total height E of the core, and the distance D between the positive end flattening head or patting head and the negative end flattening head or patting head; the processing system calculates the moving distance of the positive end flattening head or patting head and the moving distance of the positive end flattening head or patting head according to steps S1 and S2; the processing system controls the positive end flattening head or patting head and the positive end flattening head or patting head actions respectively.
5. The method for controlling the height of the omnipolar ear winding core according to claim 4, characterized in that, The processing system controls the positive electrode to flatten or pat the head according to the manually set working conditions.
6. The method for controlling the height of the all-pole ear winding core according to claim 4, characterized in that, The processing system is a PLC controller.