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battery glossary

Cell Balance

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Battery cell balance refers to the differences in state of charge of the series cells in a battery pack. The amount of imbalance is the highest cell’s state of charge (SoC) minus the lowest cell’s SoC, which represents the amount of charge that is unavailable. A pack is in balance if all cells have identical SoC. Over time, even in packs that begin with all cells at an identical SoC, the cells in a battery pack can get out of balance due to manufacturing differences, pack design, and external environmental factors. Balancing the cells of a battery pack is the process of bringing all cells to the same SoC, allowing you to access all the energy in every cell.

What is Battery Cell Balance?

Battery cell balance refers to the differences in state of charge of the series cells in a battery pack. The amount of imbalance is the highest cell’s state of charge (SoC) minus the lowest cell’s SoC, which represents the amount of charge that is unavailable. A pack is in balance if all cells have identical SoC. Over time, even in packs that begin with all cells at an identical SoC, the cells in a battery pack can get out of balance due to manufacturing differences, pack design, and external environmental factors. Balancing the cells of a battery pack is the process of bringing all cells to the same SoC, allowing you to access all the energy in every cell.

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