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Key Technical Criteria of Mobility Batteries

published: 2010-12-03 9:07

By definition, mobility batteries have higher storage volume and higher power output that are both essential to provide continuous drive power to an automobile. To better assess the compatibility of mobility batteries, there are a number of key technical criteria as follows:

Power Density (W/kg): A battery’s power density tells the quality power it can provide per kilogram. The density level determines the maximum power output, which influences the acceleration and maximum speed of a vehicle. It is a critical factor directly impacting the mobility of EVs.

Energy Density (Wh/kg): Energy density represents the amount of power storage provided per weight unit (e.g. kg) or per volume unit. It is calculated by dividing the total energy released during electrochemistry reaction by the battery’s total weight or volume. Higher energy density means longer continuous mobility, the driving range of EVs.

Cycle life: Mobility batteries encounter repeated charges and discharges over the lifetime. Each time during charging or discharging, the battery undergoes a reversible process of chemical reaction. As the number of times of charge and discharge increases, chemically active materials in the battery age and deteriorate, resulting in partial or total loss of charging and discharging ability. Life cycle is an important criterion to determine the useful lifespan of mobility batteries.

Peak Specific Power (KW): It is defined as the power that the battery per weight unit can provide for more than 30 seconds within 80 % of its cycle discharge. It specifies the maximum acceleration ability.

Costs: Costs of a battery comprise technical advancement, material, production methodology, and economies of scale.

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