Multi-stage optimization charging strategy for lithium-ion batteries considering diverse application scenarios

doi:10.19799/j.cnki.2095-4239.2024.0707

Abstract

Abstract:

Lithium-ion batteries are extensively used in electric vehicles and other applications due to their excellent performance. A charging strategy offering good charging performance is crucial for lithium-ion batteries. However, the limitations of conventional charging methods pose challenges to their large-scale adoption in electric vehicles. Therefore, we propose an optimal charging strategy for lithium-ion batteries considering various application scenarios. First, we establish the electric, thermal, and aging models of lithium-ion batteries to simulate the charging process and collect data. Then, the state-of-charge based multistage constant current (SMCC) charging strategy is developed based on the battery internal resistance profile of the battery. An objective function incorporating charging speed and state-of-health (SOH) attenuation is established, and the improved Bat Algorithm is used to optimize the SMCC current. The resulting optimal charging strategy was derived under varying weighting coefficients. For specific battery application scenarios, we proposed a balanced SMCC charging strategy based on Pareto frontier, a fast-charging SMCC charging strategy aimed at increasing cycle times. Finally, the three proposed optimal charging strategies are compared with constant current-constant voltage method. Furthermore, we proved that the proposed optimal charging strategies can better adapt to their corresponding application scenarios, shorten the charging time of lithium-ion batteries, and reduce SOH attenuation.

Key words: lithium-ion battery, multiple application scenarios, SMCC strategy, balanced charging strategy

CLC Number:

TM 912

Shuangming DUAN, Kuifeng XIA, Wei ZHU. Multi-stage optimization charging strategy for lithium-ion batteries considering diverse application scenarios[J]. Energy Storage Science and Technology, 2025, 14(2): 779-790.

Figures/Tables 12

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电池参数	规格(值)
型号	INR18650-20R
额定容量	2000 mAh
电极材料	镍钴锰酸锂/石墨
重量	45 g
初始SOC	10%
环境温度	25 ℃
充电截止电压	4.2 V

参数	数值
U_k	[2.5 V, 4.2 V]
I	[0, 4 A]
SOC	[10%, 100%]
t	[0, 24000]
T	[25 ℃, 50 ℃]
SOH	[80%, 100%]
T_amb	25 ℃

充电策略	充电时间/s	电池最大温升/℃	SOH衰减/%	能量损失/J	循环寿命/次
2C-CCCV	2065	46.1	0.01185	2380.0	843
快速充电	2061	46.0	0.007331	2302.0	1364
最大充电速度	1951	46.1	0.007573	2373.0	1320
均衡充电策略	5568	29.7	0.005696	1043.0	1755
VMCC策略	5901	28.0	0.006736	1054.4	1484
0.5C-CCCV	6645	27.1	0.006222	834.2	1607
提高循环寿命	11755	26.1	0.005409	513.6	1848
0.15C-CCCV	21661	25.2	0.005883	262.0	1699
最大循环寿命	23172	25.3	0.005385	265.2	1866

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