Adaptive passive balancing in battery management system for e‐mobility

Abstract

Summary Balancing the lithium‐ion battery pack is essential to enhance the energy usage and life cycle of the battery. This paper analyses passive cell balancing method of Li‐ion battery for e‐mobility application based on the energy loss and cost estimation through simulation and hardware implementation. As a part of the simulation, an electrical equivalent circuit battery model is developed and model parameters are obtained using electrochemical impedance spectroscopy test. The experimented passive balancing topologies include a switched shunting resistor circuit with appropriate control logic. Final voltage‐based balancing algorithm is implemented to balance the cells at high state of charge. Experimental results are compared against the theoretical investigation. Based on the outcome of this experiment, the most significant characteristics of the passive balancing system can be developed by considering the impact on the battery performance, energy loss, and cost.

A Review of State of Health and State of Charge Estimation Methods

“…Hence an auxiliary circuitry to balance these cells individually to bring them at the same level of capacity is needed. Some voltage balancing algorithms are analysed et al Duraisamy [1]. However we find that these passive balancing systems take a longer time to balance the cells as opposed to active balancing systems.…”

“…However we find that these passive balancing systems take a longer time to balance the cells as opposed to active balancing systems. Active balancing is especially necessary for aged cells to prolong their life [1]. Cell configuration may be PCM or SCM according to the power requirement of the application.…”

Efficient Battery Cell Balancing Methods for Low-Voltage Applications: A Review

“…In the analysis in [44], the authors suggest the application of P-type MOSFETs, due to their high internal resistance, beside resistor elements to save space on the BMS. In [45], a 18P14S-60Ah LIB pack is proposed as a 48 V battery pack. This study calculates the energy loss and cost analysis estimation.…”

Self-healable, super Li-ion conductive, and flexible quasi-solid electrolyte for long-term safe lithium sulfur batteries

“…1,2 However, disadvantages of LIBs related to the high electrode cost and limited energy density (∼250 W h kg −1 ) hinder their further application in electric vehicles. 3–5 As new battery configurations are urgently needed to achieve the energy density target of 500–700 W h kg −1 , 6–8 lithium sulfur batteries (LSBs) have attracted enormous attention in recent years because of the high theoretical capacity of the cost-effective sulfur (S) (1674 mA h g −1 ) and high energy density of the cell (2600 W h kg −1 ). 9–12 Nonetheless, the widespread application of LSBs is still limited by many challenges, including the poor battery cycle life, low specific energy, and low rate capability.…”