Winding machine and capacity grading method of battery cell

Abstract

The invention relates to the technical field of batteries, and provides a winding machine and a capacity grading method of a battery cell. The winding machine comprises a positive plate unwinding wheel and a winding wheel, and a positive plate unwinding end, a transmission section and a winding end are sequentially formed between the positive plate unwinding wheel and the winding wheel along the winding direction. The winding machine further comprises a thickness gauge which is mounted at the positive plate unwinding end and is suitable for measuring the surface density of a positive plate, and a first marking device which is located at the downstream of the winding wheel in the winding direction, and the first marking device is connected with the thickness gauge and is suitable for forming a capacitance mark corresponding to the surface density on the battery cell. According to the winding machine provided by the embodiment of the invention, the capacity grading of the battery cell can be realized in the winding process, so that the technological process is shortened, the production time is shortened, the production cost is reduced, and the capacity grading accuracy can be improved; in addition, the winding machine can adapt to different winding machine specifications, further better adapts to production, is convenient to control, and is easy to realize automation.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a winding machine and a method for separating the capacity of battery cells. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific energy, high voltage platform, long life, and no pollution, so they are widely used in portable electronic products, hybrid / pure electric vehicles, energy storage power stations and other fields. The consistency of lithium-ion batteries has an important impact on the capacity, performance, and safety of the battery pack. For different application scenarios, it is usually necessary to group individual cells, and connect them in series or parallel to facilitate their use together. During the charging and discharging process of the battery pack, if single cells of different capacities are used in groups, some of the single cells may be overcharged, and another part of the single cells may be undercharged. ...

AI Technical Summary

Problems solved by technology

However, this method of capacity division usually requires more capacity division cabinets, and the capacity of capacity division is greatly affected by temperature, and there are often certain differences between cabinet points, which will have a certain impact on the accuracy of capacity division data. In addition, the capacity separation cabinet occupies a large space, which increases the investment in the factory; in addition, the capacity separation process takes a long time, prolongs the production cycle, increases labor costs, and increases the cost of battery production as a whole

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