Sorting method and device for echelon utilization battery modules

Abstract

The invention provides a sorting method and device for echelon utilization battery modules, and solves the test problems that the sorting time of the echelon utilization battery modules is too long, the cost is too high, and test of different performances of batteries cannot be considered at the same time at present. The method comprises the following steps: measuring the open-circuit voltage of each battery monomer and the total voltage of a battery module, screening out a first batch of battery modules which can be used in an echelon manner according to the open-circuit voltage, and screening out a second batch of battery modules which can be used in an echelon manner according to the total voltage of the battery modules and the open-circuit voltage of the first batch of battery moduleswhich can be used in an echelon manner; screening out a third batch of battery modules capable of being used in an echelon manner from the second batch of battery modules capable of being used in theechelon manner by using a dynamic voltage test method, and grouping the third batch of battery modules capable of being used in the echelon manner according to the dynamic voltage; and screening out afourth batch of battery modules capable of being used in an echelon manner from the third batch of battery modules capable of being used in the echelon manner by using a different-frequency impedancevalue test method, and grouping the fourth batch of battery modules capable of being used in an echelon manner according to the impedance values at different frequencies.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a sorting method and device for cascading battery modules. Background technique [0002] Since 2012, with the continuous support of national policies and continuous technological advancement, my country's new energy vehicles have developed rapidly. In 2018 and 2019, the sales of new energy vehicles exceeded 1.2 million. The installed capacity of matching power batteries has also grown rapidly. In 2018, the installed capacity of power batteries exceeded 50GWh, and in 2019 it exceeded 60GWh. The performance of power batteries continues to decline during long-term use, and the performance difference between batteries is getting bigger and bigger. When its performance cannot meet the application requirements of new energy vehicles, it will be retired, and the amount of retired power batteries will also increase rapidly in the next few years. Many of these decommissioned batteries have...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a sorting method and device for cascade utilization battery modules, which solves the problem that the current cascade utilization battery module sorting time is too long, the cost is too high, and at the same time, the test of different performances of batteries cannot be taken into account. question

Images