Grouping method for cascade utilization of lithium ion batteries

Abstract

Provided is a grouping method for cascade utilization of lithium ion batteries. Firstly, lithium batteries are disassembled into battery cells; the batteries of each set of lithium battery system areindependently graded, grading is carried out firstly according to voltage and internal resistance during disassembly, and the voltage and the internal resistance are determined according to the battery number and the cascade utilization requirements; then the batteries of the same set of system are collected and subjected to capacity grading, and grading is carried out according to battery capacities after capacity grading; the initial battery capacity is determined according to nameplates of the battery systems during disassembly, so that the residual proportion of the batteries after capacity grading is determined; then the battery capacities of different sets of systems are collected; charging is carried out at the last step of capacity grading, the batteries are charged to upper limitvoltage so as to fully charge the batteries or achieve other fixed voltage, and the battery voltage is tested to be used for the second voltage grading; and data of the four times of grading are summarized and recorded, the batteries are grouped according to the grading data, and then the batteries are put into use after being assembled again. The grouping method is simple and practical and easy to operate so that the cascade utilization of the new energy lithium batteries can obtain higher economic and social value.

Description

technical field [0001] The invention relates to the technical field of utilization of lithium-ion batteries, in particular to a grouping method for step-by-step utilization of lithium-ion batteries. Background technique [0002] As one of the "seven emerging industries" in my country, the development of the new energy automobile industry has been vigorously promoted by national support policies. With the vigorous promotion of new energy vehicles, as of the end of 2017, the number of new energy vehicles on the market has exceeded 1.6 million, which brings a new problem is the decommissioning of a large number of power lithium batteries. In 2017, many power batteries were decommissioned. Started to use around 2013. According to the analysis of the development scale of new energy vehicles, it is estimated that the decommissioned capacities of power batteries from 2018 to 2020 will be 2.7GWh, 9.1GWh, and 14.3GWh respectively, with year-on-year growth rates of 182.9%, 235.4%, an...

AI Technical Summary

Problems solved by technology

[0005] Similarly, the application of power battery ladders in other fields is still in the exploratory stage. Although the prospect is broad, it is not easy to practice.

The main reason is that there is still a lack of performance evaluation of decommissioned batteries and the corresponding market performance requirements. See Establishing a Matching Relationship

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