When battery is stored for a period (e.g. stored NB for a period), voltage of each cell in
battery pack will result deviation. Higher the deviation (Delta V = voltage difference)
higher inconsistency of voltage among each cell will be realized and finally leading to shorter battery life. This phenomenon is called “CIM (Cell imbalance)”.
• In order to decrease DeltaV (voltage difference), battery cells will be divided into several groups, then the consistency of each defined group with similar self-discharge rate.
• The general parameters used to group cells are open-circuit voltage (OCV), capacity, impedance.
Self-discharge rate can be used as a grouping parameter to decrease battery cells DeltaV (voltage difference).
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INC, HP, "BATTERY CELL SELF-DISCHARGE RATE GROUPING TO ENCHANCE BATTERY LIFE (BSGTEBL)", Technical Disclosure Commons, (September 16, 2019)