News - How to Fix Dynamic Voltage Imbalance in Lithium Battery Packs (BMS Tips)

Dynamic voltage imbalance in lithium battery packs is a major issue for EVs and energy storage systems, often causing incomplete charging, shortened runtime, and even safety risks. To fix this problem effectively, leveraging the Battery Management System (BMS) and targeted maintenance is critical.

First, activate the BMS’s balancing function. Advanced BMS (like those with active balancing) transfers energy from high-voltage cells to low-voltage ones during charging/discharging, minimizing dynamic differences. For passive BMS, perform monthly "full-charge static balancing"—let the battery rest 2-4 hours after full charge to let the BMS equalize voltages.

Second, check connections and cell consistency. Loose copper busbars or dirty contact points increase resistance, amplifying voltage drops. Clean contacts with alcohol and tighten nuts; replace corroded parts. Also, use same-batch lithium cells (tested for ≤5% internal resistance deviation) to avoid inherent imbalance.

Finally, optimize charge-discharge conditions. Avoid high-current operations (e.g., rapid EV acceleration) as higher current worsens voltage drops. Use BMS-regulated chargers that follow "pre-charge → constant current → constant voltage" logic, reducing imbalance accumulation.

By combining BMS functionality with careful maintenance, you can resolve dynamic voltage imbalance and extend lithium battery pack life.

Post time: Dec-04-2025

How to Resolve Dynamic Voltage Imbalance in Lithium Battery Packs

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