Technological method for high-rate rolling and stacking of multiple tabs

Abstract

The invention discloses a high-magnification multi-tab rolling process method which comprises the following steps: a preparation stage: preparing a sheet to be coated, coating the sheet by adopting a gap zebra coating method, continuously slitting for the first time: slitting the coated sheet into a plurality of material strips, and continuously rolling the material strips to obtain a plurality of material strips; the surface flatness and consistency are improved; continuous offset plate die cutting: carrying out continuous offset plate die cutting on the rolled material belt, wherein the die cutting process comprises the step of cutting multiple tabs on the upper surface and the lower surface of the material belt; the die cutting process is continuously carried out, and the overall continuity of the material belt is kept; full-automatic winding is conducted, specifically, the material belt obtained after die cutting is subjected to full-automatic winding, and the winding precision and uniformity are ensured through a positioning induction area in the process; and secondary slitting is conducted, specifically, the rolled material belt is slit along the center position. Continuous full-automatic winding is achieved after a gap zebra coating mode and offset plate die cutting are adopted, and finally slitting is conducted, so that the precision efficiency and the cost are both considered.

Description

Technical Field

[0001] The invention relates to the field of polymer lithium ion battery processing, and in particular to a process method for high-rate winding of multi-electrode ears. Background Art

[0002] With the continuous development of lithium-ion battery technology, high-rate lithium-ion batteries are increasingly used in devices that require high energy density and fast response, such as start-stop systems and drones, due to their superior charge and discharge performance and high power output capabilities. However, the traditional production process of high-rate lithium-ion batteries usually adopts lamination or multi-electrode winding processes, which have problems such as low efficiency, high equipment cost and low uniformity.

[0003] The traditional tab punching process mainly relies on offset die-cutting or laser die-cutting technology. Although the offset die-cutting process reduces costs to a certain extent, it is prone to uneven winding due to multiple slitting and semi-automatic winding processes, resulting in poor consistency of finished products and low production efficiency. On the other hand, laser die-cutting has higher precision, but the equipment and mold costs are expensive, especially in large-scale production, it is difficult to effectively control costs. In addition, hardware die-cutting technology is also limited by problems such as fast mold wear and high maintenance costs, and it is difficult to adapt to mass production needs.

[0004] In the prior art, some process improvement methods, such as the zebra coating method, attempt to improve the positioning accuracy and winding uniformity of the tabs by coating strip-shaped coating areas and empty foil areas on the sheet. However, most of the existing coating and winding processes require process steps such as positioning point gluing and hole opening, which increases the complexity of the process. At the same time, the discontinuous winding process further affects the production efficiency and product consistency. Therefore, there is an urgent need for a high-rate winding multi-tab production process that can reduce equipment and maintenance costs while taking into account high efficiency, winding uniformity and positioning accuracy. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a process method for high-rate stacked multi-electrode ears, which adopts a gap zebra coating method and offset die-cutting technology, simplifies the process flow, eliminates the gluing and hole-opening steps, and realizes continuous positioning induction during the winding process, thereby greatly improving the efficiency and uniformity of winding, reducing equipment and maintenance costs, and is suitable for large-scale production of high-rate lithium-ion batteries.

[0006] The present invention is realized by the following technical scheme: a process method for high-rate winding of multiple pole ears, comprising the following steps: (1) Preparation stage: Prepare the sheet to be coated and coat the sheet using a gap zebra coating method, which forms a distribution of gaps and coating areas on the sheet to provide a predetermined position for subsequent tab punching and provide a positioning sensing function during continuous die cutting and fully automatic winding; (2) First continuous cutting: The coated sheet is cut into multiple strips and the strips are continuously rolled to improve surface flatness and consistency; (3) Continuous offset die cutting: The rolled material strip is continuously die-cut by offset die-cutting. The die-cutting process includes: Cutting multiple tabs on the upper and lower surfaces of the strip; The die-cutting process is carried out continuously to maintain the overall continuity of the material strip; (4) Fully automatic winding: The die-cut material strip is fully automatically rewound, and the positioning induction area is used to ensure the accuracy and neatness of the winding; (5) Second cutting: The rolled material strip is cut along the center to obtain two separate material strip parts.

[0007] As a preferred technical solution, the gap zebra coating method comprises the following steps: Forming a plurality of equally spaced transverse coating zones in the transverse direction of the sheet; A longitudinal gap area is provided between the transverse coating areas, which serves as the optical fiber positioning sensing area during the continuous die-cutting and fully automatic winding process; Form empty foil areas on both sides of the sheet to reserve space for tab punching; The longitudinal gap area is filled with metal foil to replace the traditional gluing and hole-opening process to achieve the positioning sensing function.

[0008] As a preferred technical solution, the continuous offset die-cutting process simultaneously die-cuts the pole ears on the upper and lower sides, and ensures that the relative position of each pole ear on the material strip remains consistent.

[0009] As a preferred technical solution, the die-cutting process uses offset die-cutting equipment to punch the tab area during the die-cutting process to avoid interruption of the material strip.

[0010] As a preferred technical solution, during the second slitting process, the slitting machine cuts along the center of the material strip to divide the material strip into two parts.

[0011] The beneficial effects of the present invention are as follows: the conventional multi-electrode manufacturing process usually adopts semi-automatic winding, which has low production efficiency; the present invention adopts a continuous automatic winding process, cooperates with a gap zebra coating method and a continuous offset die-cutting technology, realizes continuous positioning and automatic winding of the multi-electrode, greatly improves production efficiency, and can meet the needs of large-scale and high-speed production; The present invention sets a gap and a coating area during the coating process of the sheet material, and combines the metal foil in the longitudinal gap area for optical fiber positioning sensing, so that the tabs maintain a high degree of consistency during the winding process; compared with the traditional segmented winding process, the present invention can achieve continuous and precise winding operation, significantly improve the winding uniformity, and thus improve the overall quality and performance of the battery core; The present invention abandons the high-cost traditional laser die-cutting or hardware die-cutting methods and adopts the offset die-cutting process instead, which can achieve accurate punching of the tabs at a lower cost; at the same time, since the steps of gluing and opening holes in the traditional process are eliminated, material consumption and additional maintenance requirements are reduced, thereby further reducing equipment and maintenance costs and improving economic benefits; In the traditional process, the tab punching needs to be positioned by glue and the fiber optic sensing positioning is achieved by opening holes, which is a complicated process and prone to errors. The present invention realizes the positioning sensing function by setting a gap area during the sheet coating process and filling it with metal foil, eliminating the steps of glue and opening holes, simplifying the process flow, reducing the possibility of errors, and improving the stability of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is the coating profile diagram of the present invention; Figure 2 This is the slitting profile diagram before rolling of the present invention; Figure 3 This is the appearance diagram of the continuous die-cutting lug of the present invention; Figure 4 This is the appearance diagram of continuous slitting after continuous die cutting of the present invention. DETAILED DESCRIPTION

[0014] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0015] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0016] The present invention provides a high-rate stacking multi-electrode process method, which is suitable for the production of high-rate polymer lithium-ion batteries. The method achieves the effects of efficient production, high winding uniformity and low equipment cost by adopting a gap zebra coating method, continuous offset die cutting and full-automatic winding process. The specific implementation method is as follows: Step (1): Preparation In the implementation process of the present invention, a sheet suitable for lithium-ion batteries is first prepared, and the sheet material can be selected from various polymer composite materials suitable for lithium battery technology. The thickness of the sheet can be selected according to different application scenarios to meet the requirements of different products for energy density and power output.

[0017] like Figure 1 As shown, after the sheet is prepared, it is coated by the gap zebra coating method. The characteristic of this coating method is that by forming multiple transverse coating areas 2 and longitudinal gap areas 1 on the surface of the sheet, it provides a basis for subsequent tab punching and positioning induction. During the coating process, the design of the transverse coating area and the longitudinal gap area can be adjusted according to specific process requirements to ensure accurate positioning during the tab punching and winding process, and empty foil areas 3 are formed on both sides of the sheet to reserve positions for tab punching.

[0018] The coating should be selected to provide good tab performance after die-cutting, and have appropriate adhesion and stability to adapt to the subsequent winding process. The coating equipment should have a high-precision coating control system to ensure the uniformity and stability of the coating.

[0019] like Figure 2 As shown, step (2): first continuous cutting The coated sheet will be cut for the first time by the slitting equipment. The purpose of slitting is to divide the whole sheet into multiple strips to adapt to the subsequent winding process.

[0020] The slit strips are rolled to improve the surface flatness and thickness consistency of the strips, ensuring that there are no folds or irregularities during the winding process. The pressure and speed of the rolling process can be adjusted according to the specific material of the sheet to achieve the best flatness and thickness control effect.

[0021] like Figure 3 As shown, step (3): continuous offset die cutting After rolling, the strip enters the continuous offset die-cutting stage. This process can perform tab punching operations on both the upper and lower surfaces of the strip.

[0022] The die-cutting equipment operates the upper and lower dies synchronously during the die-cutting process to ensure that the tab structure is formed on both the upper and lower surfaces of the strip. During die-cutting, the position of the strip is monitored by the optical fiber positioning sensing system to ensure that the relative position of each tab is accurate and consistent.

[0023] In die-cutting equipment, the design of the mold should be adapted to the width of the material strip and the size of the tabs to ensure the continuity of the material strip and the cutting quality of the tabs during high-precision die-cutting. The optical fiber positioning system senses the longitudinal gap area in the gap zebra coating method to achieve precise positioning and ensure high efficiency of die-cutting.

[0024] Step (4): Fully automatic winding After die-cutting is completed, the material strip enters the fully automatic winding stage.

[0025] In this process, the winding operation is performed by a fully automatic winding device, and a positioning induction system is used during the winding process to ensure winding accuracy and neatness. The control of winding speed and tension is the key factor to ensure neat winding of the material strip. The tension control system of the winding device can ensure that the material strip is always in an appropriate tension state during the winding process, thereby avoiding irregular folding or relaxation of the material strip during the winding process.

[0026] The fully automatic winding equipment is also equipped with a real-time monitoring system, which monitors the accuracy of each winding circle through sensors to ensure the precise consistency of the tab position.

[0027] like Figure 4 As shown, step (5): second cutting After winding, the tape will be cut for the second time by the slitting equipment. The purpose of this step is to cut the wound tape along the center position to obtain two separate tape parts.

[0028] During the slitting process, the slitting equipment uses high-precision cutting tools or other cutting techniques to cut along the center of the material strip to ensure the symmetry and integrity of each separated material strip. The slitting equipment can adjust parameters according to the width and thickness of the material strip to ensure the smoothness and accuracy of the cutting.

[0029] Suitable for light equipment battery cell production When manufacturing cells for lightweight devices, such as drone batteries, thinner sheets are selected. The coating area and gap area are formed by the gap zebra coating method to ensure that the tabs can be accurately punched in the subsequent die-cutting. In the continuous offset die-cutting process, the tabs are cut simultaneously by the upper and lower synchronous dies, and the punching accuracy is ensured by the fiber optic positioning system. Finally, in the fully automatic winding process, the winding equipment ensures that the tape is neatly wound through the tension control system and the fiber optic sensor. After completion, a second slitting is performed to obtain a cell tape that meets the specifications.

[0030] Cell manufacturing for heavy-duty equipment When manufacturing high-load, start-stop batteries, thicker sheets are selected to ensure that the battery cells have higher energy density and power output. Through the precision coating of the gap zebra coating method and the offset die-cutting technology, the tabs can be accurately positioned and punched on thicker sheets. The fully automatic winding equipment adjusts the tension and speed to ensure uniform winding of thick strips and avoid uneven winding caused by material thickness. Finally, after slitting, the finished battery cell strip has high precision and consistency to meet the needs of high-load batteries.

[0031] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A process for high-rate winding of multiple tabs, characterized in that: The following steps are involved: (1) Preparation stage: Prepare the sheet to be coated and coat the sheet using a gap zebra coating method, which forms a distribution of gaps and coating areas on the sheet to provide a predetermined position for subsequent tab punching and provide a positioning sensing function during continuous die cutting and fully automatic winding; (2) First continuous cutting: The coated sheet is cut into multiple strips and the strips are continuously rolled to improve surface flatness and consistency; (3) Continuous offset die cutting: The rolled material strip is continuously die-cut by offset die-cutting. The die-cutting process includes: Cutting multiple tabs on the upper and lower surfaces of the strip; The die-cutting process is carried out continuously to maintain the overall continuity of the material strip; (4) Fully automatic winding: The die-cut material strip is fully automatically rewound, and the positioning induction area is used to ensure the accuracy and neatness of the winding; (5) Second cutting: The rolled material strip is cut along the center to obtain two separate material strip parts.

2. The process for high-rate winding of multiple tabs according to claim 1, characterized in that: The gap zebra coating method comprises the following steps: Forming a plurality of equally spaced transverse coating areas in the transverse direction of the sheet; A longitudinal gap area is provided between the transverse coating areas, which serves as the optical fiber positioning sensing area during the continuous die-cutting and fully automatic winding process; Form empty foil areas on both sides of the sheet to reserve space for tab punching; The longitudinal gap area is filled with metal foil to replace the traditional gluing and hole-opening process to achieve the positioning sensing function.

3. The process for high-rate winding of multiple tabs according to claim 1, characterized in that: The continuous offset die-cutting process simultaneously die-cuts the tabs on the upper and lower surfaces, and ensures that the relative position of each tab on the material strip remains consistent.

4. The process for high-rate winding of multiple tabs according to claim 1, characterized in that: The die-cutting process uses offset die-cutting equipment to punch the tab area during the die-cutting process to avoid interruption of the material strip.

5. The process for high-rate winding of multiple tabs according to claim 1, characterized in that: During the second slitting process, the slitting machine cuts along the center of the material strip to divide the material strip into two parts.

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