Hyundai Ioniq: High Voltage Battery Control System / Description and operation

Hyundai Ioniq (AE) 2017-2024 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 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

    High Voltage Battery Control System

    ..

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