Battery charging and discharging system based on reconstruction and charging and discharging control method

Abstract

The invention discloses a reconfiguration-based battery charging and discharging system and a charging and discharging control method, and belongs to the field of battery energy storage. Comprising an energy storage system circuit and a battery management subsystem, the energy storage system circuit comprises a plurality of battery modules and a plurality of controllable switch groups corresponding to the battery modules, and each battery module comprises a plurality of battery monomers connected in series and a redundant power supply for equalization; a bypass switch and a series switch are arranged around each battery monomer and are used for connecting or bypassing the battery monomer; the end-to-end joints of every two adjacent battery modules are connected through a switch; and the switch is connected with the battery management system and is used for controlling the on-off of the switch. And each battery module adopts a modular design, and the structures of the modules are the same, so that the overall structure is greatly simplified, the grouping of the batteries is more flexible, and large-scale processing production and whole vehicle application are facilitated.

Description

Technical field [0001] The invention belongs to the field of battery energy storage, and specifically relates to a battery charging and discharging system and a charging and discharging control method based on reconstruction. Background technique [0002] With the increasing energy crisis and environmental problems, electric energy is widely used as a clean energy source. As a major source of energy for energy storage systems, battery systems are widely used in mobile phones, cars, electric bicycles and other electrical appliances. Lithium-ion batteries are widely used due to their low self-discharge rate and high energy density. However, battery system battery life issues and charging time issues have seriously hindered the development of lithium-ion batteries. Although the decline in lithium-ion battery prices and the increase in battery modules have reduced battery life problems, charging time is still a serious shortcoming. Therefore, the key enabling technology for ba...

AI Technical Summary

Problems solved by technology

In order to solve this problem, the method of increasing the charging current is usually adopted to reduce the charging time. On the one hand, this method leads to energy loss and increased heat generation. On the other hand, it increases the requirements for wires, charging interfaces and chargers, and increases the cost and difficulty Big

[0004] In addition, the traditional battery cells are packaged in the battery pack in a fixed way, which cannot meet the dynamic changes and manufacturing differences of the battery cells during use. Low energy conversion efficiency and battery life, and even serious safety accidents

Especially when there are one or more weak cells in the battery pack, it will severely limit the service life of the entire battery pack during charging / discharging

[0005] At present, reconfigurable battery packs that can dynamically modify the electrical connection of batteries are becoming more and more important, but the research on battery reconfiguration is only used to achieve battery balancing and isolate failed batteries, and the application in battery charging and discharging scenarios has not yet been fully developed. Research

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