Battery core and method for manufacturing battery core, and lithium ion battery

Abstract

The invention is applicable to the field of lithium ion batteries, and discloses a battery core and a method for manufacturing a battery core, and a lithium ion battery. The battery core comprises a core body having a hollow inner hole, and the core body comprises a first diaphragm, a negative electrode sheet, a second diaphragm and a positive electrode sheet. The positive electrode sheet comprises a positive electrode metal substrate, positive electrode ears and a positive electrode coating layer coating the positive electrode metal substrate. The negative electrode sheet comprises a negativeelectrode metal substrate, negative electrode ear and a negative electrode coating layer coating the negative electrode metal substrate. There are at least two positive electrode ears and negative electrode ears, and the positive electrode ears are located at the same side of the hollow inner hole in the radial direction of the core body, the negative electrode ears are located at the same side of the hollow inner hole in the radial direction of the core body, each positive electrode ear is integrated with the positive electrode metal substrate, and each negative ear is integrated with the negative electrode metal substrate. The coating areas of the coating layers on the pole sheets are added to improve the capacity of the lithium ion battery and improve the cylindricity of the battery core.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a battery core, a method for manufacturing the battery core and a lithium ion battery with the battery core. Background technique [0002] In the prior art, the positive and negative plates of lithium-ion batteries are first coated with a coating on the metal substrate, and then the tabs are welded. The lithium-ion batteries manufactured by this process will have the following problems: [0003] 1) When applying the coating, it is necessary to reserve a blank area on the metal substrate for tab welding, thereby reducing the area where the active material can be coated, thereby affecting the improvement of the capacity of the lithium-ion battery. [0004] 2) The part where the tab is welded on the pole piece is thicker than other parts. After winding to form the battery core, the part corresponding to the tab is thicker, which will affect the overall size and cylindricity of t...

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a battery winding core, which aims to solve the problem that the capacity of lithium-ion batteries is difficult to increase due to the connection of the positive and negative tabs with the positive metal substrate and the negative metal substrate by welding in the prior art. Technical problem of poor cylindricity of winding core

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