Method for manufacturing lithium ion battery and rolled core thereof and lithium ion battery

Abstract

The invention relates to a method for manufacturing a lithium ion battery, which comprises the following steps of: separating a positive plate from a negative plate by a membrane, and winding layer by layer to form a rolled core; and after the membrane is wrapped at the tails of the negative plate and the positive plate, continuing to wind for a circle or above around the rolled core so as to form a membrane protection layer on the outermost layer of the rolled core. The membrane protection layer disclosed by the invention has small friction coefficients, so that the membrane protection layer is beneficial to mounting the rolled core in a shell; meanwhile the potential safety hazard caused by the damaged rolled core can be prevented due to the protection layer.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a manufacturing method of a lithium-ion battery which is more convenient for assembly of a winding core into a shell and reduces potential safety hazards, as well as the winding core and the lithium-ion battery. Background technique [0002] Since the commercialization of lithium-ion batteries, lithium-ion batteries have been active as energy carriers in communications, digital cameras, video cameras, Notebook and other fields. At the same time, lithium-ion batteries are also an ideal choice for the energy source of future electric vehicles. With the upgrading of electronic and digital products, consumers' requirements for the appearance of batteries tend to be thinner, but at the same time, product manufacturers or mobile phone battery manufacturers also require higher and higher capacities for lithium-ion batteries. In the case of smaller and smaller batteries but higher and higher ba...

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Problems solved by technology

[0004] However, in this way of finishing the winding core, the periphery of the winding core is the aluminum foil with the positive electrode material and the termination tape. The friction coefficient of the aluminum foil is large. When the winding active material is increased and the thickness of the winding core increases, it will increase the difficulty of entering the shell. It is more likely that the winding core will be damaged, which increases the safety hazard of battery use

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