Kia Niro: High Voltage Battery Control System / Description and operation

Description

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

Diagnose system fault

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

Components and components location
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 ...

Schematic diagrams
Schematic Diagram ...

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