A passive balancing circuit in battery management systems that equalizes cell voltages by dissipating excess energy as heat through resistors.
A passive balancing circuit is an electronic component within a Cell Monitoring Unit (CMU) that addresses voltage imbalances among individual battery cells in a series-connected pack. It operates by selectively connecting resistors across higher-voltage cells to bleed off excess charge, ensuring all cells maintain similar voltage levels during charging and discharging cycles. This prevents overcharging of individual cells, extends battery pack lifespan, and enhances safety by maintaining optimal operating conditions.
诱因 → 失效模式 → 工程缓解
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Passive balancing dissipates excess energy as heat through resistors, while active balancing transfers energy between cells using capacitors, inductors, or converters. Passive is simpler and cheaper but less efficient.
Ideal for applications where cost is critical, balancing currents are low (<500mA), and energy efficiency is less important than simplicity, such as consumer electronics or small energy storage systems.
Energy inefficiency (wasted as heat), limited balancing current, heat management requirements, and inability to address cell under-voltage conditions.
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