1. Introduction
1.1 Why its important to have isolation in electric car?
Electric car has high and low voltage system.
High Voltage systems are mounted on car chassis. There must be a minimum electrical isolation/resistance in between High Voltage System and Car Chassis to ensure safe car operation.
To keep high voltage circuit isolated, high voltage harness and components are have insulating material that creates a high level of electrical resistance which protects the chasis from high voltage exposure.
There is monitor which is installed in battery, which measure periodically the resistance between the high voltage conductors and chassis.
1.2 What is BMS (Battery Management System )?
"Battery Management System is a printed Circuit board assembly, which communicates with the BMSs (each module) and the powertrain/vehicle.
BMS performs the isolation test.
1.3 Type of Isolation
There are internal and external isolation.
1.3.1 Internal Isolation
- BMS_a123_SW_Internal_Isolation
1.3.2 External Isolation
- BMS_a035_SW_Isolation
- BMS_w035_SW_Isolation
- BMS_a151_SW_external_isolation