Page 36 - PEN eBook July 2023

Smart Energy

During the discharging process in EVs, the battery’s stored energy is depleted, and the voltage
of the battery decreases as the electric current flows from the battery to the motor. The rate
of discharging depends on the power demand of the motor and the battery’s capacity, which

determines the amount of energy that can be delivered before the battery requires recharging.
Efficient battery discharging is essential for optimizing the range and performance of EVs.

Li-ion battery expression
The battery-charging equation is expressed in relation to the battery capacity. It depends on the
numerical value of the rated battery capacity in ampere-hours and the time at which this value is
declared. The equation is defined as:

I = M × Cn

Where I is the charge or discharge current in amperes, M is the multiplication factor of C, C is
the numerical value of rated capacity in ampere-hours and n is the time in hours at which C is
determined.

Graphic of an EV charging at a residential property

WHAT ARE THE INDUSTRY STANDARDS FOR DEVELOPING EV
BATTERIES?

Currently, the industry standard for developing EV batteries involves utilizing Li-ion technology,
which has undergone significant advancements over the past 30 years. While these batteries
provide superior energy density compared with other technologies, they require precise control

36 JULY 2023 | www.powerelectronicsnews.com