Tab pole piece and winding battery

Abstract

The invention provides a tab pole piece, which comprises a coating area and an empty foil area positioned on one side of the coating area, the empty foil area comprises a cutting area and a retaining area, the retaining area is positioned between the coating area and the cutting area, the cutting area forms a plurality of tabs through cutting, the plurality of tabs are sequentially arranged in the length direction of the tab pole piece, and the ends, close to the coating area, of the plurality of tabs are connected into a whole through the reserving area; a parting line is formed at a position where the cutting area is connected with the reserving area, each tab comprises a first edge and a second edge which are opposite to each other, the first edge and the second edge intersect with the parting line, an included angle a is formed between the first edge and the parting line, the included angle a is located in the tab, and the included angle a is an acute angle. The invention also provides a wound battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a tab pole piece and a winding battery. Background technique [0002] With the development of electronic technology, lithium-ion batteries have been widely used due to their advantages such as high specific power, long cycle life, good safety performance and no pollution. Traditional wound batteries are mainly single-tab or multi-tab wound batteries, and full-tab wound batteries are increasingly recognized due to their low internal resistance and high energy density. The manufacturing method of the all-tab winding battery is usually to coat one end of the positive and negative electrodes with active materials (the part coated with active materials is called the coating area), and the other end is a blank part (that is, the uncoated part). Covered with active material, this part is called empty foil area), during the positive and negative electrode sheet winding process (or aft...

AI Technical Summary

Problems solved by technology

[0003] In the process of inward folding of the above-mentioned blank part, in order to smooth the tabs, it is usually necessary to apply a large pressure on the surface perpendicular to the pole piece (that is, the two cylindrical end faces of the cylindrical battery formed after winding), which is easy It causes the active material on the internal positive and negative electrode sheets to fall off, and even causes the deformation of the internal electrode sheet, which greatly reduces the performance of the wound battery

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