NCM523型三元锂离子电池长周期性能测试实验与充放电策略优化研究

Posted 2021-04-28 热科学学报

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文章信息

Experimental Study on Long Cycling Performance of NCM523 Lithium-Ion Batteries and Optimization of Charge-Discharge Strategy

NCM523型三元锂离子电池长周期性能测试实验与充放电策略优化研究

ZHU Xiaojun, ZHU Jianhua, WANG Junming, GAN Zhongxue, LI Guoxian, MENG Chuizhou

朱晓军，朱建华，王俊明，甘中学，李国显，孟垂舟

1. 中国石油大学（北京）化学工程与环境学院

2. 新奥科技发展有限公司

3. 河北工业大学机械工程学院

4. 煤基低碳能源国家重点实验室

Corresponding author:

WANG Junming; MENG Chuizhou

E-mail:

wangjunming@enn.cn;

2018108@hebut.edu.cn

Journal of Thermal Science, 2020, 29(5): 1180-1192.

https://doi.org/10.1007/s11630-020-1174-9

Keywords: lithium-ion batteries, NCM523, long cycling performance, charge-discharge strategy, prismatic cell

Springer Link下载链接或点击“阅读原文”

https://link.springer.com/article/10.1007/s11630-020-1174-9

摘要

随着社会对清洁可再生能源和电动汽车的需求不断增加，人们对能量的高效存储提出了更高的要求。作为目前发展最为成功的一种锂离子电池，以镍钴锰酸锂正极材料为代表的三元锂离子电池（也叫NCM锂离子电池）扮演着越来越重要的角色。为了进一步提升电池的储能性能，大量的科研工作集中于先进正极材料的组分优化与制备研发和电池系统的设计与集成。但是，过往的研究工作成果大都基于相对有限的不超过1000次充放电循环的测试实验，得出的规律和结论不能真实反映电池在实际工况中全寿命周期里的运行情况。在本项工作中，我们对最新开发的NCM523型三元锂离子电池的单体电芯和电池模组分别进行了超长寿命的充放电循环测试，较为全面且深入地研究了不同放电深度、充放电倍率和工作温度等关键运行条件参数对于单体电芯和电池模组剩余容量的影响规律，并对充放电策略进行调整优化以达到有效提升整体能量存储效率的目的，上述实验研究成果为实际工况下同类型锂离子电池的高效使用提供了有价值的参考依据，并且所开发的先进电池在优化的充放电策略管理运行下有望满足电站储能系统和电动汽车的用电需求。

Abstract

With the increasing demand for clean renewable energy and electric cars, people have put forward higher requirement for the energy storage system. One of the most successful lithium-ion batteries with a cathode combination of lithium nickel manganese cobalt oxide (also called NCM lithium-ion battery), has been playing an increasingly important role. So far, numerous research has been done on the fabrication of cathode material with optimization of its composition, design, and assembly of the battery system in order to improve the energy storage performance. However, most of the previous studies were conducted based on relatively short cycling time of testing, with limited charge-discharge cycles of no more than 1000. Thus the conclusions were insufficient to be applied in the practical working condition. In this work, by using the developed NCM523 lithium-ion batteries, we have performed a series of ultra-long cycling testson the individual cell and its module, with a comprehensive study on the relationship between the retained capacity after long cycling time and the depth of discharge (DOD), charge-discharge rate and operating temperature. Optimization of the charge-discharge strategies on a single cell and the whole module was also made to effectively improve the overall energy storage efficiency. This experimental study offers a guideline for the efficient use of similar types of lithium-ion batteries in the practical working condition. The developed batteries together with the optimized charge-discharge strategy proposed here are promising to meet the requirements for applications of stationary energy storage and electric cars.

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NCM523型三元锂离子电池长周期性能测试实验与充放电策略优化研究