Electronic circuit in automotive BMS that equalizes voltage across battery cells to optimize performance and lifespan.
A balancing circuit is a critical electronic component within an Automotive Battery Management System (BMS) that actively monitors and adjusts the voltage of individual battery cells in a series-connected pack. It ensures all cells maintain similar state-of-charge (SOC) levels by redistributing energy from higher-voltage cells to lower-voltage cells or dissipating excess energy as heat, preventing overcharging or deep discharging of specific cells that could lead to capacity degradation, thermal runaway, or system failure.
诱因 → 失效模式 → 工程缓解
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Passive balancing dissipates excess energy as heat through resistors, simple but inefficient. Active balancing transfers energy between cells using converters, more efficient but complex and costly.
It prevents individual cell overcharge/over-discharge, reduces capacity fade, extends battery lifespan by up to 20%, and mitigates thermal runaway risks.
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