Abstract

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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