Formation method for improving capacity consistency of old soft-pack power lithium batteries

Abstract

The invention relates to a formation method for improving capacity consistency of a waste soft pack power lithium battery. The formation method comprises the steps of screening the battery, performing formation on the capacity consistency of a single battery, and finally, measuring and recording capacity, a voltage and internal resistance performance of the single battery for use. By the formation method for improving the capacity consistency of the waste soft pack power lithium battery, the battery activity cannot be fundamentally restored or improved, false fatigue of an electron is eliminated only by a special formation process, the activity of an electron surface layer is improved, and the real performance of the electron and a battery cell is restored; the method is initial at home and abroad; the index consistency of the single battery processed by the method is improved to 85% from 40% and is in an advance level in industry; and by the technology, the capacity consistency of the water power lithium battery is greatly improved, and the grouping rate and the application rate during secondary usage can be nearly doubled.

Description

technical field [0001] The present invention relates to the reuse of old batteries, in particular to a method for reusing old soft-pack power lithium batteries used in new energy vehicles, that is, a formation method for improving the capacity consistency of old soft-pack power lithium batteries. Background technique [0002] Power lithium batteries refer to lithium-ion batteries for new energy vehicles (currently only referring to new energy vehicles announced by the Ministry of Industry and Information Technology). Generally, the monomers are relatively large. Except for a few cylindrical lithium batteries, they are basically above 10 ampere hours. There are 500 amp-hour monomers. Good magnification and good discharge are required, and both specific energy and energy density are required to save the weight and volume of new energy vehicles. In particular, such lithium batteries are required to have good consistency in terms of capacity, voltage, internal resistance and di...

AI Technical Summary

Problems solved by technology

The application of energy storage to lithium batteries is also used on a large scale, that is, when they are used, many are only used together. It is also the same as the use of lithium batteries in new energy vehicles, facing the problem of matching and consistency. Therefore, power lithium batteries Consistency is a very important issue for secondary utilization. If the consistency is not good, if you cannot match groups, the utilization rate will be extremely low, which will affect the efficiency of use.

Even if it is barely used, due to poor consistency, it will have an impact on the performance, life and safety of the use

However, after the power lithium battery is used in new energy vehicles, its consistency will be reduced, which will bring obstacles to the secondary use, affect the utilization rate, and thus affect the benefits of the enterprises that use the power lithium battery for secondary use