Battery

Abstract

The invention provides a battery. The battery comprises a roll core, the roll core comprises a first pole piece, a diaphragm and a second pole piece which are wound, the diaphragm is located between the adjacent first pole piece and second pole piece, the first pole piece is provided with a first tab, and the second pole piece is provided with a second tab; the first tab is close to a first bending part at the first end of the roll core, the second tab is close to a second bending part at the second end of the roll core, and the winding tail end of the roll core covers the first bending part and extends from the first bending part to the second bending part; and the area between the end head of the second end of the roll core and the second tab is opposite to the first part of the roll core, and the first outer-layer gummed paper covers the outer surface of at least one side of the first part. First outer-layer gummed paper has a certain thickness, so that the thickness of the part, which is attached to the first outer-layer gummed paper, of the roll core can be increased. Therefore, the battery provided by the embodiment of the invention solves the technical problem that the surface flatness of the roll core structure in the lithium ion battery is relatively poor.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of batteries, and in particular, to a battery. Background technique [0002] Lithium-ion batteries have the advantages of large capacity, low energy density, small volume, light weight and environmental protection, and have been widely used in digital electronic products and electric vehicles and other industries. [0003] At present, the winding core of a lithium-ion battery is generally formed by winding a positive electrode sheet, a negative electrode sheet, and a separator, and two tabs are respectively arranged on the positive electrode sheet and the negative electrode sheet. [0004] However, the surface flatness of the winding core structure in the existing lithium-ion battery is poor, which will cause problems such as swelling of the lithium-ion battery during cycling, and shorten the cycle life of the lithium-ion battery. Contents of the invention [0005] In view of this, a...

AI Technical Summary

Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a battery to solve the problem that the large thickness difference between the two ends of the existing winding core in the width direction will cause the lithium-ion battery to expand during the cycle and shorten the cycle life of the lithium-ion battery. technical problem

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