Method for winding electric core of lithium ion battery

Abstract

A method of winding a cell of a lithium ion battery comprises the following steps: A. preparing a cell material; B. measuring a parameter, and calculating a distance between adjacent tabs of an inner-layer pole piece and a distance between adjacent tabs of an outer-layer pole piece according to a predetermined formula; C. cutting tabs according to the calculated distance between the adjacent tabs of the inner-layer pole piece and the calculated distance between the adjacent tabs of the outer-layer pole piece; D. placing the inner-layer pole piece with the cut tabs, the outer-layer pole piece with the cut tabs, and an isolation film in a predetermined order, and then winding them into a cell. In this application, the distance between the adjacent tabs of the inner-layer pole piece and the distance between the adjacent tabs of the outer-layer pole piece are first calculated, then the tabs of the inner-layer pole piece and the tabs of the outer-layer pole piece are cut according to the calculation result, and the above parts are wound into the cell. Therefore, the positions of the tabs can be accurately determined, the work time and a lot of manpower are saved, and the work efficiency is improved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery cell winding method. Background technique [0002] It has become a consensus that new energy vehicles will gradually replace traditional gasoline vehicles in the development of the automobile industry in various countries, and the power battery as a core component is considered by the industry to be the key to the development of new energy vehicles. The current power lithium battery is roughly divided into two manufacturing methods, one is to prepare cells by lamination, and the other is to prepare cells by winding, and the cells prepared by winding are divided into square winding and ring winding. figure 1 It is a structural schematic diagram of an annular battery cell, which includes a cell reel 11 , pole pieces 12 and tabs 13 . figure 2 Schematic diagram of the structure of each layer of electric core after the electric core material is wound, including the nega...

AI Technical Summary

Problems solved by technology

Because a large number of lugs are often required on each battery cell, that is, a large number of lug spacing needs to be calculated, so this method requires a huge amount of work, and because of human measurement errors, it is difficult to accurately locate the lugs at one time, often It needs to be measured many times, and it is quite troublesome to input the measurement results in the program, which will consume a lot of manpower and time

In addition, if the material or process is changed, all the data made before will be invalid. Therefore, when making large-capacity batteries, the success rate of this method is very low

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