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Ev Electrical Vehicle Power Supply Charging Speed

Reference data and engineering information about ev electrical vehicle power supply charging speed for automotive and transport applications.

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Overview

Engineering reference data for Ev Electrical Vehicle Power Supply Charging Speed in automotive transport.

Key Formulas

Braking Distance

d=v22μgd = \frac{v^2}{2\mu g}

Distance to stop from velocity v.

Fuel Consumption

FC=distancefuel volumeFC = \frac{\text{distance}}{\text{fuel volume}}

Distance per unit fuel.

Horsepower

HP=τ⋅n5252HP = \frac{\tau \cdot n}{5252}

Torque × RPM / 5252.

Drag Force

Fd=12ρv2CdAF_d = \frac{1}{2} \rho v^2 C_d A

Aerodynamic drag on vehicle.

Variables

SymbolDescriptionUnit
ddBraking distancem
vvVelocitym/s
μ\muFriction coefficient—
τ\tauTorqueN·m
CdC_dDrag coefficient—

Charging Speed Formulas

c=PEc = \frac{P}{E}

Where:

  • cc = charging speed (km/h or miles/h)
  • PP = charging power (kW)
  • EE = vehicle energy consumption (kWh/km or kWh/miles)

Power from Single-Phase AC

P=V×I×11000P = V \times I \times \frac{1}{1000}

Where:

  • PP = power (kW)
  • VV = voltage (V)
  • II = current (A)

Charging Time and Energy

t=QP×60t = \frac{Q}{P} \times 60

Econsumed=c×t60×EE_{\text{consumed}} = \frac{c \times t}{60} \times E

Where:

  • tt = charging time (minutes)
  • QQ = charged energy (kWh)
  • PP = charging power (kW)
  • EconsumedE_{\text{consumed}} = total energy consumed during driving (kWh)

Definitions

Charging Speed: The rate at which driving range is replenished, measured in km or miles added per hour of charging.

Energy Consumption (E): The vehicle's electrical energy usage per unit distance, typically expressed in kWh/100km or kWh/100miles. This value varies based on driving conditions, vehicle efficiency, and load.

Charging Power (P): The electrical power delivered from the charging source to the vehicle, measured in kilowatts (kW). For AC charging, this depends on the supply voltage and current capacity.

Notes

  • The primary formula c=P/Ec = P / E establishes the direct relationship between charging power and the vehicle's efficiency.
  • For AC charging, converting voltage (V) and current (A) inputs to power (kW) allows use of the charging speed formula.
  • Charging time can be estimated by dividing the required energy (kWh) by the charging power (kW) and multiplying by 60 to convert hours to minutes.

References

Source: engineeringtoolbox.com