Lithium ion battery and preparation method thereof

Abstract

The invention provides a lithium ion battery and a preparation method thereof. The method comprises the steps of 1, arranging a first pole piece A1, a first pole piece A2, a third pole piece A3,..., and a first pole piece An on the first surface of a diaphragm at intervals in sequence along the length direction of a diaphragm; 2, taking the first pole piece A1 and a first clearance as a first bending unit which is bent towards a first direction, placing a second pole piece on the second surface of the first clearance, taking the first pole piece A1 as a second bending unit which is bent towards a second direction, and acquiring a first laminated unit; 3, taking the first laminated unit and a second clearance as a first bending unit, taking the first laminated unit as a second bending unit,repeating the step 2 to obtain a second laminated unit; ...; n, taking the (n-2)th laminated unit and the (n-1)th clearance as a first bending unit, taking the (n-2)th laminated unit as a second bending unit, repeating the step 2 to obtain a (n-1)th laminated unit, and thus obtaining a battery pole set. Therefore, the stacking time of the pole pieces can be reduced, and the preparation efficiencyof the lithium ion battery can be improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long life, safety, and environmental protection, and have been widely used in notebook computers, mobile phones, digital cameras, electric vehicles, energy storage and other fields. With the continuous development of the demand for computers, mobile phones, electric vehicles, etc., batteries are required to have higher energy density. [0003] At present, there are two main methods for preparing lithium-ion batteries: winding and stacking. Compared with winding batteries, stacked batteries have higher utilization rate, better cycle performance and higher energy density. The laminated process is to alternately stack positive plates, separators, and negative plates together. However, in the current preparation method of battery...

AI Technical Summary

Problems solved by technology

However, in the current preparation method of battery cells, the stacking time is relatively long, and the prepared battery is prone to short circuit between the positive electrode sheet and the negative electrode sheet during use, and misalignment between the electrode sheets is prone to occur, thereby causing serious damage to the safety of the battery. influences

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