Electric Vehicle -Energy Storage

n e r g
ES t o r a g

,Storage Devices

,Parameters to be considered
• Costs per kWh
• Specific Energy density (Wh/kg)
• Vol. Energy density (Wh/litre)
• Life-cycles at certain C-rate and temperature at certain DoD
• Capacity and DoD usable
• C-rate usable
• Safety and safe-disposal

, Slow Charging vs Fast Charging
• Depends on the C - rate of the Battery
• C- rate is the rate at which battery is charged/ Discharged
• Battery capacity and Charger ratings
• Charging at 1C and higher (1.5C, 2C, 3C, 4C) is fast Charging
• Charging at 0.5C and lesser (0.1C, 0.2C, 0.3C, 0.4C) is slow Charging

Ratings C - rate Time taken to
charge
10kWhr Battery charged with 10 kW charger 1C 1hr
10kWhr Battery charged with 5 kW charger 0.5C 2 hr
10kWhr Battery charged with 20 kW charger 2C 30 min
10kWhr Battery charged with 40 kW charger 4C 15 min