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 safety component (Iso Meter), which is installed in battery. It monitor/measure periodically the resistance/isolation between the high voltage systems/conductors and chassis. It preemptive shut-down the high voltage system, when it detect isolation.
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
1.4 What will happen?
2 How to Fix
2.1 Internal Isolation
Please read more details in another guide (How to fix, cost etc.) Link
2.2 External Isolation
Please read more details in another guide (How to fix, cost etc.) Link
