Consistency evaluation, sorting and recombination device for retired power batteries

Abstract

The invention discloses a consistency evaluation, sorting and recombination device for retired power batteries. The consistency evaluation, sorting and recombination device comprises a voltage-adjustable bidirectional DC/AC converter, N charging and discharging units and an upper computer, wherein each charging and discharging unit is interconnected with the communication bus through a direct-current bus and is connected with the upper computer through the communication bus. According to the device, mutual flow balance of energy is realized by pairing, complementing and synchronously controlling the bidirectional DC/DC converters; a multi-dimensional multi-time scale SOC and SOH mathematical model of the battery is established based on the parameters such as the multi-dimensional EIS data set, the temperature and the open-circuit voltage, and the consistency state, the SOC and the SOH parameters of the power battery is determined by adopting a neural network; the retired batteries are sorted and recombined according to the consistency, then the balanced voltage value of each group of decommissioned batteries is determined by taking the minimum energy loss and the shortest time as objective functions, and then balanced and optimized charging and discharging control is carried out on each group of decommissioned batteries, so that the grouping quality and integrity are improved. According to the device, the consistency evaluation, sorting and recombination of the retired power batteries can be quickly, efficiently, accurately and flexibly realized.

Description

technical field [0001] The invention belongs to the technical field of step-by-step utilization of decommissioned batteries, and relates to a detection device. The specific goal is to realize the consistency evaluation, sorting and reorganization of decommissioned power batteries. Background technique [0002] In recent years, with the continuous promotion of low-carbon energy-saving economy and the proposal of "dual carbon" goals, the new energy electric vehicle industry has developed rapidly, and the number of decommissioned power batteries for electric vehicles will increase sharply. In order to ensure the safety and use of vehicles Performance, general electric vehicle manufacturers require that when the capacity of the power battery decays to 70% to 80%, it must be decommissioned and replaced. Since the decommissioned power battery still has a certain remaining capacity, the value utilization of the battery can be maximized through cascade utilization. The cascade util...

AI Technical Summary

Problems solved by technology

Sorting and reorganization is carried out according to the consistency evaluation results, and then the balanced voltage value of each group of decommissioned batteries is determined with the minimum energy loss and the shortest time as the objective function, so that the balanced and optimized charge and discharge control of each group of decommissioned batteries is carried out to improve battery matching. Quality and integrity, so as to solve the problems of low device efficiency, long test cycle, poor accuracy and high equipment cost in the prior art

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