Traction Battery System
The traction battery is the key pivotal subsystem that supplies the electric vehicle's propulsion system with DC power while absorbing energy during regenerative braking, with charge and discharge transitions taking place continuously and shiftingly throughout the vehicle's dynamic operation conditions.
Typical Test Requirements
- Bidirectional charge and discharge capability under dynamic load profiles
- DC voltage and current transient response during acceleration and regeneration
- Validation of battery interface behavior under simulated SOC and voltage variation
- Stability assessment during rapid power direction changes
Traction Inverter & Motor Drive
While e-motor relies on the AC power converted from the traction battery as the whole system's driving force with regulated torque and speed, as the control unit to the same, inverters and motor drives are among the essential parts for reliable and responsive driving conditions.
Typical Test Requirements
- DC-side voltage fluctuation tolerance during torque transients
- AC output voltage, frequency, and phase control validation
- Regenerative operation and reverse power flow handling
- Control loop stability under rapid load and speed changes
On-Board Charger (OBC)
On-board charger is the key interface where the transformation of AC and DC power takes place and bridges the power flow between the vehicle and the external power facility, including the charger or even the AC grid under the V2G scenario and the rest of the advanced V2X operation conditions.
Typical Test Requirements
- AC input voltage and frequency variation testing
- Power factor and harmonic performance validation
- Bidirectional charging and grid feedback operation (if applicable)
- Transition testing between charging modes and power levels
EV Charger (AC, DC, Grid-Connected)
The EV charge represents the key interface of bidirectional energy flow for V2G and V2X operation, where power transformation occurs between electric vehicles and external power infrastructure. EV charger should be technically reliable against variant grid conditions, charging protocols, and vehicle-side constraints.
Typical Test Requirements
- AC and DC charging mode emulation under variable grid conditions
- Dynamic load profile testing during charging ramp-up and ramp-down
- Bidirectional power flow validation for V2G and regenerative operation
- Grid interaction behavior under voltage, frequency, and phase disturbances