What causes cell imbalance in a nickel-cadmium battery?

Cell imbalance in a nickel-cadmium battery occurs primarily due to the charging method employed. When a constant-potential voltage charging method is used, it can lead to unequal charging conditions among the individual cells in the battery pack. This type of charging does not adequately account for the varying state of charge of each cell, which can result in some cells receiving a higher voltage than others during the charging process.

As a result, some cells may become overcharged while others are undercharged. This discrepancy leads to a difference in capacity and state of charge within the battery pack, causing cell imbalance. Over time, this imbalance can deteriorate the performance and lifespan of the battery.

Understanding this concept is crucial for maintaining the overall health of nickel-cadmium batteries, as employing a more balanced charging technique can help prevent cells from becoming imbalanced and ensure more consistent performance across all cells in the battery.