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

Hyundai Ioniq (AE) 2017-2025 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

Specifications

SpecificationSafety Plug▷ Specification Item Specification Rated Voltage (V) 400 Rated Current (A) 80 Fuse Rated Current (A) 125 Fuse Melting Time Rated Current x 110% Min...

Other information:

Hyundai Ioniq (AE) 2017-2025 Service Manual: Repair procedures

Removal • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries...

Hyundai Ioniq (AE) 2017-2025 Service Manual: Schematic diagrams

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