Kia Niro: High Voltage Battery Control System / Description and operation
The high voltage battery system consists of the BMS ECU (Battery Management System
ECU), Power Relay Assembly (PRA), safety plug, battery temperature sensor, and battery
ambient sensor. Especially the BMS ECU controls SOC (State Of Charge), power, cell
balancing, cooling and troubleshooting of the high voltage battery system.
The PRA includes main relays (positive, negative), pre-charge relay, pre-charge
resistor and battery current sensor.
[Main Functionalities]
Item
|
Functionality
|
SOC control
|
| • |
Optimize SOC by using voltage, current, temperature of the high
voltage battery
|
|
Power control
|
| • |
Predict available battery power, prevent from over-charging or
discharging, improve durability and maximize charging/discharging
energy by calculating optimum charging & discharging energy in accordance
with the vehicle state
|
|
Power Relay control
|
| • |
Supply or shut off the battery power during IG ON/OFF
|
| • |
Prevent accident from high voltage system failure
|
|
Cooling System control
|
| • |
Maintain the optimum temperature by variating and controlling
the cooling fan speed based on the maximum system temperature and
deviation between battery modules
|
|
Troubleshooting
|
| • |
Limit battery power in various fail-safe level
|
| • |
Control power relays in case of system trouble
|
|
|
SOC (State Of Charge): Level of available energy of the high voltage
battery
|
Component Location
1. BMS ECU
2. Safety Plug
3. Main Relay (+)
4. Main Relay (-)
5. Pre-Charge Relay
6. Pre-Charge Resistor
7. Battery Cur ...
Components and components location
Schematic diagrams