锂离子电池不同工况下充电效果对比及用户充电方法选择研究

doi:10.19595/j.cnki.1000-6753.tces.211544

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Abstract Lithium-ion batteries have become the preferred power source for major car companies due to their superior comprehensive performance, and are widely used in the field of electric vehicles. How to effectively control the battery, especially the reasonable choice of charging method is crucial to meet the needs of users, improve charging efficiency, and delay battery decline.However, at present, there is no systematic comparative analysis of the charging effect of multiple charging conditions, and because the mainstream BMS is embedded in a single working condition, the optimization selection of charging working conditions is not considered according to the actual needs of different users. Therefore, this paper carries out relevant research on five practical charging conditions, the specific content is as follows:
Firstly, in a variety of charging conditions, 1#constant current condition, 2#constant power condition, 3#five-stage constant current charging condition, 4#variable current intermittent charging condition, constant current charging and constant dQ/dV charging combined 5#composite charging condition five charging strategies were selected to carry out accelerated aging cycle experiment at 45 °C, and performance experiments were carried out at 25°C, including capacity test and small rate charge and discharge test. The charging target for cycling experiments under different charging conditions is 80% of the rated capacity of the battery in 30 minutes to be fully charged.
Secondly, aiming at the lack of systematic comparative analysis of charging effects under different charging conditions, from the analysis of charging capacity, energy consumption, charging energy efficiency and battery degradation characteristics, the following conclusions can be obtained: the capacity retention rate of composite working conditions after 1000 aging cycle experiments is the highest, which is 91.004%; Analyzing the energy consumption and energy utilization efficiency of the battery, it is found that the energy efficiency in the variable current intermittent condition is the lowest, 94.14% after 1000 cycles, and the highest energy utilization efficiency after 1000 aging cycles is in the constant power condition. In the first 1 000 cycles, the battery degradation mechanism is analyzed based on the IC curve, and it is found that the main reasons for the battery capacity decline are the loss of active materials in the positive and negative electrodes and the decrease in the number of active lithium ions.
Finally, in view of the problem that the charging condition is not selected based on user needs, the charging starting point, waiting time and target charging capacity are considered to optimize the charging condition. According to the analysis of experimental results, it is found that when the charging starting SOC=0%, taking the battery charging capacity as the evaluation standard, charging for 20min, the optimal working condition is the five-stage constant current or variable current intermittent working condition. When the initial charge SOC=20% and the charging time is 15min or less, intermittent charging of variable current is the optimal operating condition. Considering the 20% SOC interval, the SOC interval is different, and the optimal working conditions are different, for example, the 0~20% SOC interval should use the five-stage constant current working condition, and the 20~40%SOC and 40~60%SOC interval are suitable for the variable current intermittent working condition.

Key words： Lithium-ion battery different charging conditions capacity increment curve performance degradation charging condition selection

Received: 05 August 2022

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	Sun Bingxiang
	Li Kaixin
	Jing Long
	Su Xiaojia
	Zhang Yuan

Cite this article:

Sun Bingxiang,Li Kaixin,Jing Long等. Comparison of Charging Effect of Lithium-Ion Battery under Different Working Strategies and Study on User Charging Method Selection[J]. Transactions of China Electrotechnical Society, 0, (): 71-71.

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