高压大容量磷酸铁锂电池组的主动均衡系统研究

项目名称： 高压大容量磷酸铁锂电池组的主动均衡系统研究

项目编号： No.51507120

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 电工技术

项目作者： 姚川

作者单位： 武汉第二船舶设计研究所

项目金额： 19万元

中文摘要： 为了满足行驶里程、速度以及爬坡能力的要求，车载电池的电压、能量、功率等级越来越高，需要大量的单体电池串、并联成组使用。电池串联成组使用后，由于单体电池间的不一致性，其循环寿命大大降低，制约电动汽车的大规模发展和应用。对于磷酸铁锂电池，其电压在容量充放电末期会快速变化，不一致性问题更加严重。为了有效解决一致性的问题，本课题针对高压大容量磷酸铁锂电池组开展高性能均衡方式和均衡结构的研究。均衡方式方面重点开展各种均衡方式相互作用机理以及优化组合方式研究；均衡结构方面，重点开展模块化多级均衡结构及其优化设计方法、协调控制策略、能量优化管理策略、稳定性分析和控制策略的研究。最后，通过搭建模块化多级均衡系统平台对提出的均衡方式、均衡结构以及相关分析和控制策略进行实验验证。课题研究成果将推动我国电池成组技术的进一步成熟应用，同时也为电动汽车的大规模发展提供理论和技术支撑。

中文关键词： 主动均衡；模块化多级均衡；优化设计；控制策略；稳定性

英文摘要： In order to satisfy the requirements of electric vehicle (EV) on driving distance, speed, and grade ability, the voltage, energy, and power levels of the battery in the EV are increased continuously, requiring vast amounts of single battery cells connected in series or in parallel. Due to the inconsistency among the single battery cell, the cycle life of the battery pack connected in series is reduced greatly. For the LiFePO4 battery, its voltage is changed quickly when the capacity is close to full or empty, so the problem resulted by the inconsistency is more serious. In order to solve this problem effectively, active equalization system for high-voltage and large-capacity LiFePO4 battery pack is researched in this project, whose topics are to propose high-performance equalization method and structure. For the equalization method, its main research contents are the interaction mechanism and optimal combination among the different balanced approaches. And for the equalization structure, the modularized multi-stage equalization structure (MMES) and its optimal design, coordinated control scheme, energy management strategy, stability analysis and control are the researched key points. Finally, a platform based on MMES will be fabricated, and then the proposed equalization method, structure, and corresponding analysis, strategy can be verified. The research results of this project will promote the further mature application of the battery pack, and provide theoretical and technical basis for the large-scale development of the EV.

英文关键词： Active Equalization;Modularized Multi-Stage Equalization;Optimal Design;Control Strategy;Stability