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Full-tab pole piece and wound battery

A technology of full tabs and pole pieces, applied in winding/folding electrodes, battery components, secondary battery manufacturing, etc. Pole piece deformation and other problems, to achieve the effect of simple design, reduce shedding, and reduce stress

Pending Publication Date: 2021-08-17
MICROVAST POWER SYST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Full-tab pole piece and wound battery
  • Full-tab pole piece and wound battery
  • Full-tab pole piece and wound battery

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Embodiment approach

[0057] As an embodiment, the wound battery further includes a second separator 24, and the positive all-tab sheet 21, the first separator 23, the negative all-tab sheet 22, and the second separator 24 are sequentially stacked from inside to outside, These four are stacked to form the battery core 2 by winding.

[0058] As an embodiment, the distance between the tabs 211 on the positive all tabs 21 beyond the top of the first diaphragm 23 is 0.5-5 mm after smoothing, and the tabs 221 on the negative all tabs 22 are smoothed. The distance beyond the bottom end of the first diaphragm 23 after flattening is less than 5mm.

[0059] As another embodiment, the distance between the tabs 211 on the positive all tabs 21 beyond the top of the first diaphragm 23 is less than 3mm after smoothing, and the tabs 221 on the negative full tabs 22 are smoothed. The distance beyond the bottom end of the first diaphragm 23 is less than 3mm.

[0060] As another embodiment, the distance between th...

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Abstract

The invention provides a full-tab pole piece which comprises a coating area and an empty foil area located on one side of the coating area, a boundary line is formed at the position where the empty foil area is connected with the coating area, the empty foil area is cut to form a plurality of tabs of quadrilateral structures, the tabs are sequentially arranged in the length direction of the full-tab pole piece, the four edges of each tab comprise a first edge, a second edge and a third edge, the third edge is located in the empty foil area and close to the boundary line, the third edge is parallel to the boundary line, the distance between the third edge and the boundary line is smaller than 5 mm, the first edge and the second edge are oppositely arranged, and the first edge and the second edge are oppositely arranged. The first edge and the second edge intersect with the third edge, and an included angle a is formed between the first edge and the third edge and 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 an all-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 (o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/533H01M4/02H01M10/04
CPCH01M10/0431H01M50/533H01M4/04Y02P70/50Y02E60/10H01M50/538H01M10/0587H01M50/536H01M50/531
Inventor 邓国友慎晓杰靳勇臧庆凤魏相
Owner MICROVAST POWER SYST CO LTD
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