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

Kia Niro 2017 (DE HEV) Service Manual / Hybrid Control System / 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 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

•	Diagnose system fault

•	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

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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