Electric Vehicle Battery System

Runaway Prevention Device (RAD) Description and Operation

~1min read

Description

The RAD is installed on each battery module. If the high-voltage battery swells due to cell overcharging, the RAD cuts off the ground of the main relay and precharge relay. If a cell is overcharged, the switch turns OFF and the vehicle cannot be driven.

RAD

10-Cell RAD

14-Cell RAD

RAD Wiring Harness

Operation

Module Normal Failure
Current ON (Connected) OFF (Cut-off)
RAD - Lift Switch
High voltage Normal Cut
Phenomenon Normal Engine Start Failure and Warning Lamp
Diagram

Test yourself

A quick Kia Soul EV Owner's Manual quiz: every answer comes with an explanation and a link to the manual page.