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 Owner's Manual: Maintenance Services

You should exercise the utmost care to prevent damage to your vehicle and injury to yourself whenever performing any maintenance or inspection procedures. We recommend you have your vehicle maintained and repaired by an authorized HYUNDAI dealer. An authorized HYUNDAI dealer meets HYUNDAI's high service quality standards and receives technical support from HYUNDAI in order to provide you with a high level of service satisfaction...

Hyundai Ioniq (AE) 2017-2025 Owner's Manual: Battery Recharging

WARNING Always follow these instructions when recharging your vehicle's battery to avoid the risk of SERIOUS INJURY or DEATH from explosions or acid burns: Before performing maintenance or recharging the battery, turn off all accessories and place the Engine Start/ Stop button in the OFF position...