System for echelon utilization of whole pack of waste storage batteries in storage and charging station and control method

Abstract

The invention relates to a system for the echelon utilization of a whole pack of waste storage batteries in a storage and charging station and a control method, and belongs to the field of waste powerstorage battery echelon utilization. Aiming at the problem that an existing charging station cannot meet the charging requirement and urgently needs to achieve the dynamic capacity expansion, according to the technical scheme, the system for the echelon utilization of the whole pack of waste storage batteries in the storage and charging station comprises a charging unit, an energy control system,a power control module, an energy storage converter module, bidirectional DC / DC modules and heterogeneous waste power storage battery packs. Each heterogeneous waste power storage battery pack is provided with one bidirectional DC / DC module, and the bidirectional DC / DC module is used for adjusting the output voltage of the heterogeneous waste power storage battery pack connected with the bidirectional DC / DC module, so that each heterogeneous waste power storage battery pack obtains the same output voltage. The energy storage converter module is connected with the charging unit in parallel. The control method utilizing the above system comprises a charging control method and a discharging control method, and can achieve the purpose of realizing the dynamic capacity expansion of the charging station by utilizing the waste storage batteries.

Description

technical field

[0001] The invention belongs to the field of cascade utilization of waste power batteries, in particular to a system and control method for cascade utilization of waste batteries in a storage and charging station. Background technique

[0002] Lithium-ion batteries have the advantages of large capacity, high energy density, no memory, and small self-discharge, and have been unanimously recognized by battery manufacturers and automobile manufacturers. With the rapid development of electric vehicles and large-scale energy storage markets, the output of lithium-ion power batteries, which currently occupy the largest market share, is also growing rapidly, and the number of lithium-ion batteries produced is bound to show a blowout growth. It will also bring a large number of used batteries that cannot meet the needs of electric vehicles and are retired. The remaining capacity of these batteries is mostly 60-80% of the initial capacity. How to effectively reuse the...

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