Tab pole piece and winding battery

A technology of tabs and pole pieces, which is applied in the direction of secondary batteries, battery pack components, non-aqueous electrolyte battery electrodes, etc., can solve the problem of reducing the performance of wound batteries, deformation of internal pole pieces, active materials of positive and negative pole pieces, etc. Problems such as shedding

Active Publication Date: 2021-07-30
MICROVAST POWER SYST CO LTD
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  • Summary
  • 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...

Method used

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  • Tab pole piece and winding battery
  • Tab pole piece and winding battery
  • Tab pole piece and winding battery

Examples

Experimental program
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Embodiment approach

[0058] As an embodiment, the wound battery further includes a second separator 24, and the positive tab tab 21, the first diaphragm 23, the negative tab tab 22, and the second diaphragm 24 are stacked sequentially from the inside to the outside. The latter form the battery core 2 by winding after lamination.

[0059] As an embodiment, the distance between the tab 211 on the positive tab tab 21 and the top of the first diaphragm 23 is 0.5-5 mm after smoothing, and the tab 221 on the tab tab 22 on the negative tab is smoothed. The distance beyond the bottom end of the first diaphragm 23 is less than 5 mm.

[0060] As another embodiment, the tab 211 on the positive tab tab 21 exceeds the top of the first diaphragm 23 by less than 3mm after being smoothed, and the tab 221 on the negative tab tab 22 exceeds the distance after smoothing. The distance between the bottom ends of the first diaphragm 23 is less than 3mm.

[0061] As another embodiment, the distance of the tab 211 on t...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M50/538H01M50/533H01M10/0525H01M10/0587
CPCH01M4/13H01M10/0525H01M10/0587Y02P70/50Y02E60/10
Inventor 邓国友慎晓杰靳勇沈庆煜臧庆凤
Owner MICROVAST POWER SYST CO LTD
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