New Cell Balancing Charging System Research for Lithium-ion Batteries

Abstract

With recent advancements in the electrical industry, the demand for high capacity and high energy density batteries has increased, subsequently increasing the demand for fast and reliable battery charging. A battery is an assembly of a plurality of cells, in which maintaining a balance between neighboring cells is crucial for stable charging. To this end, various methods have been applied to battery management systems. Representative methods for maintaining the balance in battery cells include a passive method of adjusting the balance using a resistor and an active method involving the exchange of energy between the cells. However, these methods are limited in terms of efficiency, lifespan, and charging time. Therefore, in this study, we propose a new charging method at the battery cell level and demonstrate its effectiveness through experiments.

Energy Harvesting and Energy Storage Systems

“…Figure 7 illustrates the constant current-constant voltage (CC-CV) charging curve of a battery. A battery is typically charged through the CC-CV [77]. Whenever the battery is charged, its CC charging time decreases, while the CV charging time increases.…”

Improved Battery Balancing Control Strategy for Reconfigurable Converter Systems

“…Due to the cell-to-cell variation in lithium-ion battery systems, individual cells may become overcharged or over-discharged during charging and discharging processes. Failure to perform timely and effective balancing may result in decreased battery pack lifespan, reduced capacity, performance degradation, and even safety hazards such as fire [1,2]. Therefore, battery balancing plays an important role in improving overall battery pack lifespan, ensuring battery safety and reliability, and increasing energy utilization efficiency [3,4].…”

Novel Bidirectional Voltage Equalizer Based on Double Output Dual Switch Flyback Circuit

“…However, the energy flowing through the resistance is wasted which leads to low equalization efficiency, and the heat generated is not conducive to the normal operation of the equalization system a Correspondence to: Hui Xiong. E-mail: xionghui@tiangong.edu.cn *Key Laboratory of Intelligent Control of Electrical Equipment, Tiangong University, No.399, Binshui West Road, XiQing District, Tianjin, 300380, China **School of Control Science and Engineering, Tiangong University, Tianjin, China [4]. Non-dissipative circuits mainly rely on passive components such as inductors, capacitors, and transformers to achieve energy transfer which has a faster equilibrium speed and less energy loss.…”

“…Among them, the dissipative circuit mainly consumes excess power from a high‐power cell through a resistor connected in parallel with it. However, the energy flowing through the resistance is wasted which leads to low equalization efficiency, and the heat generated is not conducive to the normal operation of the equalization system [4]. Non‐dissipative circuits mainly rely on passive components such as inductors, capacitors, and transformers to achieve energy transfer which has a faster equilibrium speed and less energy loss.…”