Extending the Lifespan of Lithium-ion Batteries in Electric Vehicles Through Active Balancing

Today, I want to share with you the lifespan of lithium-ion batteries used in electric vehicles and whether it can be extended through active balancing. During normal use of lithium-ion batteries, there may be an imbalance in the amount of charge between each individual cell due to prolonged uneven charging and discharging, which can cause ion exchange imbalance and affect the battery’s lifespan and capacity. Active balancing can solve this problem by connecting any individual cells in need of balancing within the battery pack to the main system’s balancing circuit and transferring energy from cells with higher voltage to those with lower voltage using electronic principles. Active balancing is an important component of battery management systems and optimizes the battery pack’s management to ensure each individual cell’s charge remains balanced. Its working principle involves a circuit that accurately measures the battery voltage and compares the voltage differences between each individual cell within the battery pack, calculates the amount of energy that needs to be transferred to cells with lower voltage, and transfers energy from cells with higher voltage to those with lower voltage. The circuit in active balancing typically includes voltage sampling, comparison, rectification, and reverse protection circuits. The working process can be summarized into four steps: regular sampling of each individual cell’s voltage within the battery pack, comparing voltage differences, transferring energy from cells with higher voltage to those with lower voltage, and automatically closing the balancing circuit when the balance point is reached to reduce battery loss. In summary, active balancing ensures each individual cell within the battery pack maintains a balanced charge, thereby extending the battery’s lifespan and capacity and improving the overall performance and reliability of the battery pack. Follow me for more knowledge on lithium-ion batteries.

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