Cascade utilization oriented removal method for decommissioned battery parallel module

Abstract

The invention discloses a cascade utilization oriented removal method for a decommissioned battery parallel module. The method comprises steps as follows: S1, extracting charge loop current I (k) of kgroups of a charge-discharge process and actual terminal voltage U (k) of the decommissioned battery parallel module; S2, extracting part of data in S1 for cell potential model parameter identification; S3, calculating theoretical voltage Ute (k) corresponding to current I(k) in a cell potential model of the decommissioned battery parallel module; S4, calculating a root-mean-square error of the actual terminal voltage U (k) of the decommissioned battery parallel module and the theoretical voltage Ute (k), and removing the decommissioned battery parallel module if the value of the root-mean-square error is larger than a preset value. According to the method, the decommissioned battery parallel module is not required to be disassembled, whether cell aging phenomenon exists in the decommissioned battery parallel module or not is judged by calculating the root-mean-square error of the actual voltage and the theoretical voltage corresponding to the equivalent model in the decommissioned battery parallel module, the method is simple, a battery is not required to be dismounted, and the method can be widely applied to the field of batteries.

Description

technical field [0001] The invention relates to the field of batteries, in particular to an inspection method for decommissioned batteries oriented to cascade utilization. Background technique [0002] With the development of the world's automobile industry, the consumption of petroleum energy is increasing day by day, which accelerates the pace of oil shortage, and the emission of automobiles with internal combustion engines as traditional power causes air pollution and greenhouse effect. Electric vehicles are favored for their low pollution, low noise and high energy efficiency. [0003] When the charging capacity of the car battery pack is reduced to about 80% of the original capacity, it is no longer suitable for continued use in electric vehicles, but it can still meet the performance requirements of other application fields other than power vehicles. The appearance of the battery is intact and there is no damage. 1. When each functional component is effective, the bat...

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Problems solved by technology

[0006] One method does not need to disassemble the battery parallel module, and judges the performance of the battery module by measuring the capacity, internal resistance, open circuit voltage and other parameters of the entire battery parallel module. However, this method cannot check the aging degree of the battery cells inside the battery parallel module. Judgment, the aging degree of the single cell may be inconsistent with the aging degree of the entire battery parallel module, resulting in inaccurate test results and potential risks

[0007] Another way is to disassemble the battery of the battery parallel module and measure the capacity, internal resistance, open circuit voltage and other parameters of the battery cell to judge the performance of the battery cell. During the process, it is easy to cause deformation and short circuit of the battery, which will reduce the reliability of the battery.

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