Preparation method of lithium ion battery roll core

Abstract

The invention discloses a preparation method of a lithium ion battery roll core, which specifically comprises the following steps of (1) respectively welding tabs on a positive plate and a negative plate, and pasting insulating gummed paper at the tab positions and at the tail part of an electrode paste head to respectively obtain a positive plate with tabs and a negative plate with tabs, (2) winding the positive plate with the tab, the negative plate with the tab and a diaphragm together to obtain a roll core, (3) flattening the roll core by using a core pressing machine to obtain a square semi-finished roll core, and (4) cutting the square semi-finished product roll core by using a laser cutting machine, then carrying out gluing insulation treatment on the outer edge of the cut roll coreby using glue, and drying to obtain the roll core. The manufacturing process for manufacturing the special-shaped battery is mainly optimized, the process flow is simplified, the production efficiency and the qualification rate are improved, and the production cost is reduced; compared with a traditional die cutting process, the preparation method is high in cutting precision, and burrs generatedin the cutting process are completely eradicated.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery production, and more specifically relates to a preparation method of a lithium-ion battery winding core. Background technique [0002] Lithium-ion batteries are currently commercialized batteries with the highest specific power and energy density, and have been widely used in modern tools such as notebook computers, mobile phones, communication base stations, and automotive power supplies. The winding core is the most important part of the lithium-ion battery. In order to improve the electrical performance and safety performance of the winding core, while saving production costs and improving production efficiency, it is very important to optimize and develop a new winding core design. [0003] At present, the existing technology can only produce winding cores of specific shapes, such as cylindrical or square, and batteries with special shapes cannot be realized. For example, the inve...

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Problems solved by technology

[0003] At present, the existing technology can only produce winding cores of specific shapes, such as cylindrical or square, and batteries with special shapes cannot be realized

For example, the invention patent with the application number CN201811498908.4 discloses a winding disc-shaped polymer lithium battery and its manufacturing method, but the utilization rate of the inner space of the cavity is low, and more advanced high-temperature pressurized formation process cannot be applied , lower production efficiency

[0004] However, the existing laser die-cut pole piece preparation technology, such as the invention patent with application number 201510433680.0 discloses a lithium-ion battery pole piece treatment process, and the invention patent with application number 201810814516.8 discloses a special-shaped lithium battery and its preparation. method, but they are all only for the cutting of the pole piece, which needs to be rewound or stacked after cutting, and the size of the negative pole piece needs to be controlled to be larger than the positive pole piece, and the production efficiency is low

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