OPTIMAL ACTIVE SoC BALANCING FOR A STRING OF LITHIUM-ION BATTERY CELLS BASED ON OPTIMIZATION WITH CONSTRAINTS  ON TEMPERATURE AND AGING

Tạ Quang Duy; Nguyễn Văn Chí

doi:10.34238/tnu-jst.12044

OPTIMAL ACTIVE SoC BALANCING FOR A STRING OF LITHIUM-ION BATTERY CELLS BASED ON OPTIMIZATION WITH CONSTRAINTS ON TEMPERATURE AND AGING

About this article

Received: 13/02/25 Revised: 27/02/25 Published: 27/02/25

Authors

1. Ta Quang Duy , Vinh Phuc College of Economics and Technology
2. Nguyen Van Chi, TNU - University of Technology

Abstract

This paper presents an optimal active SoC balancing treatment considering the aging effect for Lithium Ion batteries in the next connected string implemented by CuK switching circuit. With the SoC controlling the target balancing for the cells in the string, it is ensured that in all operating cases, the current and temperature of the cells cannot exceed the permissible technical limits corresponding to the aging level of the cells. The nonlinear optimal control problem was established based on the current and temperature balancing constraints and examines the effect of cell aging in the model of the SoC balancing system. The sequential quadratic programming method was used to solve the mathematical priority at the sample extraction times that determines the optimal duty of PWM to the balancing balances. The SoC balancing results for the cells were compared between the case where all the cells in the string are new and the case where the cells in the string have different chemical ages, showing the difference in the balance control and temperature control of the cells in the string during the SoC balancing process. The application of the SoC balancing method for the cells in the string propopsed in this paperenables the cells in the string to operate more safely. Hence, the battery life of the cells can be extended.

Keywords

Lithium-Ion battery; State of charge; Optimal control; Cell balance; State of health

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DOI: https://doi.org/10.34238/tnu-jst.12044

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