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Lithium-Ion Battery Equalization System Simulation Study on Bidirectional Flyback DC-DC Converter

Author: WuDi
Tutor: YinChengLiang；WuHongJie
School: Shanghai Jiaotong University
Course: Vehicle Engineering
Keywords: new energy vehicles lithium-ion battery battery equalization bi-directional flyback DC-DC converter simulation
CLC: U463.633
Type: Master's thesis
Year: 2012
Downloads: 236
Quote: 3
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Abstract


As the main technical bottlenecks, battery technology has constrained the development of new energy automotive industry. In addition to the defective performance of the battery itself, the battery management technology has largely limited the development of the industry. Battery equalization management technology could manage the battery pack to avoid imbalance by effective strategies, and maintain the consistency of single battery, the best performance and long service life of the battery pack.Battery imbalance is mainly caused by prone to overcharge and over discharge phenomenon of individual aging cells. Overcharge and over discharge will accelerate the aging and capacity fading of these cells, resulting in serious battery inconsistency, so that the available capacity and performance of battery reduced.This article can easily address this part of prone to overcharge and over discharge phenomenon of individual aging cells with the purpose of a balanced management, rather than simply blindly overall equalization. So at the beginning of the cell into a pack, we have focused on the energy balance of individual prone to aging cells, which can greatly reduce these overcharge and over discharge occurs. It can help protect these cells and maintain equalization of the battery pack. Compared to the overall balance, the efficiency of this program will greatly improve.In summary, this article present a innovative equalization solutions based on bidirectional flyback DC-DC converter topology equalization system, and completed energy equalization simulation of the lithium-ion battery module in the discharge process, the standing process and the charging process. Results verified that energy equalization management for a typical imbalance lithium-ion battery pack is feasible, while achieving the effective energy equalization of the design requirements in the discharge process, the standing process and the charging process.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Electrical equipment and accessories > Power system > Battery
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