Lithium battery and manufacturing method thereof

Abstract

The invention discloses a lithium battery and a manufacturing method thereof, which relate to the technical field of lithium ion batteries. The lithium battery includes: a diaphragm, an A-type pole piece unit and a B-type pole piece unit; the A-type pole piece unit includes a first One A-type pole piece, the second A-type pole piece, and the third A-type pole piece; the B-type pole piece unit includes the first B-type pole piece, the second B-type pole piece, and the third B-type pole piece; The diaphragm has opposite first and second faces, and the diaphragm has a first region, a second region, a third region, a fourth region, In the fifth area, the sixth area and the seventh area, the diaphragm is wound in the order of the first direction, the second direction, the first direction, and the second direction from the first end to the second end, and so on. This application can better combine the respective advantages of the winding type and the laminated type, and can carry out mass production on the basis of ensuring high energy density, good cycle performance and high manufacturing precision of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery and a manufacturing method thereof. Background technique [0002] For now, most of the cores of power lithium batteries are processed by winding and stacking, but both have certain defects. For example, the cross-section of the winding core is elliptical, and defects such as uneven reaction and powder loss of active materials are prone to occur at the rounded corners. The advantage of the winding type is that it is faster and can be mass-produced; while the laminated core The advantage lies in the high energy density of the battery and good cycle performance. The "Z-shaped lamination" and thermal composite laminations are mostly used, but these two methods inevitably require the stacking of the pole pieces, which makes it difficult to guarantee the manufacturing accuracy and efficiency. low and difficult to mass-produce. [0003] Based on the abo...

AI Technical Summary

Problems solved by technology

For example, the cross-section of the winding core is elliptical, and defects such as uneven reaction and powder loss of active materials are prone to occur at the rounded corners. The advantage of the winding type is that it is faster and can be mass-produced; while the laminated core The advantage lies in the high energy density of the battery and good cycle performance. The "Z-shaped lamination" and thermal composite laminations are mostly used, but these two methods inevitably require the stacking of the pole pieces, which makes it difficult to guarantee the manufacturing accuracy and efficiency. low, difficult to mass produce

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