Battery capacity or Energy capacity is the ability of a battery to deliver a certain amount of power over a while. It is measured in kilowatt-hours (product of voltage and ampere-hours). It determines the energy available to the motor and other elements.
How much power are you really getting from EV charging can be determined by your vehicle model, battery capacity and even the weather… There are 3 main types of chargers used to power EVs in the UK: ‘Slow’ ‘Fast’ and ‘Rapid/Ultra Rapid’. Slow EV chargers charge up to 3.6 kW, and can take between 6-12 hrs for a full charge.
For instance, consider a battery with a capacity of 50 kWh. If it’s charged at a 1C rate, it’s charged at a rate that fills the battery’s full capacity in one hour, so 50 kW. Charging at a higher rate, like 2C, would mean it charges in half the time, i.e., 30 minutes, with a power output of 100 kW.
The car battery industry uses a standard system from the Battery Council International (BCI). This system groups batteries into sizes based on their dimensions and performance. Each size meets the power needs of different vehicles. The common BCI group sizes for automotive power include Group 24, 27, 31, 34, and 65.
The Main characteristics associated with EV battery are: Battery capacity, also known as energy capacity, refers to the amount of energy a battery can deliver over a specific period. It’s measured in kilowatt-hours (kWh) and calculated by multiplying the battery’s voltage by its ampere-hours (Ah).
Recently announced by CATL that its batteries have a density of over 290Wh/litre for LFP chemistry and over 450Wh/litre for NCM chemistry. Power gives acceleration to the car and maintains it at a given speed. Though mechanically power is the product of torque and rpm.