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What to do about high cell voltage alerts in your BESS

Learn what causes high cell voltage alerts in your BESS and which steps you can take to bring voltages back to normal.

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Understanding and Addressing High Cell Voltages in Your Battery Storage

Experiencing high cell voltages in your battery system can be concerning, but understanding the potential causes and taking quick action can help ensure the safety and optimal performance of your system.

What Causes High Cell Voltages?

Several factors can contribute to high cell voltages and voltage threshold crossing alerts:

Significant imbalances: Uneven distribution of charge across cells can lead to some cells reaching higher voltages than others. This can occur due to:

  • Faulty connections: Poor connections can cause imbalances.

  • External factors: Temperature variations or uneven cooling can affect individual cells.

State of charge (SoC) and voltage misalignment: If the BMS (Battery Management System) fails to accurately measure or balance SoC and voltage, some cells might be overcharged, leading to high voltages.

Faulty BMS: A malfunctioning BMS may not be able to properly control voltage limits, leading to overcharging.

Degraded or low-quality cells: Cells with accelerated aging or inherent manufacturing issues might reach higher voltages faster due to their limited capacity.

What You Can Do:

If you experience high cell voltage alerts, follow these steps:

Check the balancing status: Your BMS should provide information on individual cell voltages and balancing activity. Look for significant differences between cells and ensure balancing is functioning properly. TWAICE Voltage Spread and the upcoming Performance Manager solution will help you identify those.

Monitor other parameters: Beyond voltage, check for unusual temperature variations, current imbalances, or exceeded thresholds for other parameters like charge/discharge rates. These can indicate a broader BMS issue. TWAICE Safety Solution logs all alerts, that is the place to look for more similar alerts.

Evaluate String SoH: Check the State of Health (SoH) of individual cell strings. A weak cell or large imbalances can limit the overall SoH of a string, highlighting potential issues. TWAICE Health Analytics will help you to quickly identify strings with an abnormal and low SoH.

Seek professional assistance: If you're unsure about the cause or how to proceed, consult the system manufacturer for support and potential repairs or talk to our TWAICE Customer Success Experts.

Remember!

Early detection and intervention are crucial to preventing damage to your battery system and ensuring its continued safe and reliable operation. By understanding the potential causes of high cell voltage alerts and taking appropriate action, you can maintain the health and performance of your battery investment.