Hyundai Ioniq (AE): High Voltage Battery Control System / Description and operation
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 |
|
SpecificationSafety Plugâ–· 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:
Inspection
•
Before measuring the pressure of the refriferant line, check whether the refrigerant amount is charged in accordance with the specified charging amount.(Refer to Heating, Ventilation, Air Conditioning - "Specifications")1.
Removal1.Disconnect the negative (-) battery terminal.2.Remove the front / rear bumper cover.(Refer to Body - "Front Bumper Cover")(Refer to Body - "Rear Bumper Cover")3.Disconnect the connector (A) from the parking assist sensor.4.Remove the sensor (A) by pulling out both ends of the sensor holder.
