Battery cell of cylindrical lithium ion power battery, and processing method thereof

Abstract

The invention relates to a battery cell of a cylindrical lithium ion power battery ,and a processing method thereof. A ceramic layer is arranged above a positive electrode dressing on a positive plate, and a positive electrode empty foil is arranged from the upper part of the ceramic layer to the edge of the positive electrode dressing; and a negative empty foil is arranged below the negative dressing and is flush with the lower end of the battery cell. The processing method of the battery cell of the cylindrical lithium ion power battery comprises the following processing steps: overlapping and rolling a diaphragm I and a diaphragm II for 2-3 circles; feeding the negative empty foil downwards between the two layers of diaphragms; upwards feeding the positive electrode empty foil to the upper diaphragm, and winding; flattening the two ends of the battery cell; carrying out hole scalding on the flattened central part; collecting tabs at the positive and negative ends of the battery cell; and adhering head protection gummed paper to two side walls of the battery cell. The battery cell is safe and reliable, and has the characteristics of small internal resistance, fast conduction, small self power consumption and high volume energy ratio; and after the battery cell structure is flattened, a head folding mode is adopted, so that a space ring and a battery cell head form a clearance position, and the top of the battery cell is prevented from being crushed due to direct contact between the space ring and the head after the cover is closed.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a battery cell and a processing method of a lithium ion cylindrical power battery. Background technique [0002] Disadvantages of the prior art: [0003] ①Traditional batteries adopt the method of welding the positive and negative ear leads, which has a large internal resistance and consumes a large amount of energy; [0004] ②The positive electrode dressing + empty foil used in the positive electrode sheet of the traditional cell does not consider the winding fluctuation. The edge of the negative electrode dressing is easy to be lower than the edge of the positive electrode dressing, and the edge of the dressing (the junction between the empty foil and the dressing) is damaged after kneading. Analysis of lithium safety hazards; [0005] ③The traditional battery is covered with plastic, and the deformation stress generated during the charging and discharging process of the battery canno...

AI Technical Summary

Problems solved by technology

[0003] ①Traditional batteries adopt the method of welding positive and negative tab leads, which has large internal resistance and consumes a lot of energy;

[0004] ②The positive electrode dressing + empty foil used in the positive electrode of the traditional battery does not take into account the winding fluctuation. Analysis of hidden dangers of lithium safety;

[0005] ③Traditional batteries are fully covered with glue, and the deformation stress generated during the charging and discharging process of the batteries cannot be released, which may easily lead to the phenomenon of wrinkling and lithium deposition on the pole pieces

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