Method for manufacturing square power polymer lithium ion battery

Abstract

The invention discloses a method for manufacturing a square power polymer lithium ion battery. The method comprises the steps of compounding, coating, continuous rolling of positive and negative electrodes, preparing electrode pieces of multiple lugs of the positive and negative electrodes, dividing a positive and negative electrode piece coil with the multiple lugs into two coils through a continuous dividing and cutting machine, accomplishing piece manufacturing process, coiling, performing super welding on a positive electrode aluminum lug and a negative electrode nickel lug, top side packaging, injecting electrolyte, forming, high-temperature ageing, secondary packaging and performing volume distributing. The method has the advantages that the internal resistance of the manufactured battery is low, the battery emits a small amount of heat during operation, can continuously discharge electricity at a high rate, thermal design is not required during the assembly of the discharge battery, the design cost of a power battery pack can be reduced, the volumetric specific energy of the power battery pack can be improved, and the safety performance of the power battery pack can be improved.

Description

technical field [0001] The invention relates to a method for manufacturing a lithium ion battery, in particular to a method for manufacturing a square power polymer lithium ion battery. Background technique [0002] The electronic information age has led to a rapid increase in the demand for mobile power. Lithium-ion batteries have the important advantages of high voltage and high capacity, long cycle life, and good safety performance, making them widely used in portable electronic devices, electric vehicles, space technology, and defense industries. The multifaceted and broad application prospects have become a research hotspot that has attracted widespread attention in recent years. [0003] At present, the production method for larger lithium-ion batteries is close to maturity. However, for smaller polymer lithium-ion batteries, due to the small distance between the tabs and the small size of the pole pieces and pole groups, manual manufacturing is currently used. The pr...

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Problems solved by technology

[0003] At present, the production method for larger lithium-ion batteries is close to maturity. However, for smaller polymer lithium-ion batteries, due to the small distance between the tabs and the small size of the pole pieces and pole groups, manual manufacturing is currently used. The production method directly affects the manufacturing yield and safety of polymer lithium-ion batteries. In addition, manual production is likely to cause cross-contamination of positive and negative electrodes, which increases the automatic discharge rate of the battery and shortens the working time of the battery.

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