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 when IG ON/OFF
|
| • |
Prevent from negligent accident by high voltage system trouble
|
|
Cooling System control
|
| • |
Sustain the optimum temperature by controlling variable cooling
fan speed in accordance with the maximum system temperature and
deviation among battery modules
|
|
Troubleshooting
|
| • |
Limit battery power in various fail-safe level
|
| • |
Control power relays in case of system trouble
|
|
|
SOC (State Of Charge): 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 ...
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Components and components location
Schematic diagrams