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Hyundai Tucson: 48V Battery System - Description

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Electrical System / 48V Battery System / 48V Battery System - Description

Description

The Mild Hybrid Electric Vehicle (MHEV) uses hybrid power source (Engine, MHSG), so its fuel efficiency is relatively high and exhaust emission is very small compared to the traditional vehicle which uses only engine as power source. It consists of the engine, motor, 48V voltage battery and control modules.

In Engine supports the motor in case the vehicle needs more power (HEV Mode).

The Mild Hybrid Starter Generator (MHSG) not only drives the vehicle but also generates electric energy during regenerative braking for charging the 48 voltage battery.

MHEV Operation Mode and Power Flow

Component Location

Component Location

Mild Hybrid Starter Generator (MHSG)
48V Battery
Power Cable

48V Battery Assembly

48V Battery Assembly
Power relay assembly
Main Fuse
Main relay
Battery Module Assembly
BMS & LDC Assembly
Battery Cooling Fan

1. 48V Battery Assembly

2. Power relay assembly

2. Power relay assembly

3. Main Fuse

3. Main Fuse

4. Main Relay

4. Main Relay

5. Battery Module Assembly

5. Battery Module Assembly

6. BMS & LDC Assembly

6. BMS & LDC Assembly

7. Battery Cooling Fan

7. Battery Cooling Fan

48V Battery System - Removal

Turn the ignition switch OFF and disconnect the battery (-) terminal. Remove the luggage board (A). Disconnect the BMS ECU extension wiring harness connector (A). Disconnect the inverter power cables (A). Tightening torque

48V Battery System - Repair procedures (Removal)

Turn ignition switch OFF and disconnect the battery (-) terminal. Remove the 48V battery assembly. (Refer to 48V Battery System - "Repair procedures") Remove the battery cover (A) after loosening the mounting bolts. Tightenin

BMS ECU Terminal and Input/Output Signal

Terminal Function Connector B10-A Connector B01-B Removal Turn ignition switch OFF and disconnect the battery (-) terminal. Remove the 48V battery assembly. (Refer to 48V Battery System - "Repair procedures")

SEE MORE:

Roll rod bracket

Remove the engine room under cover. (Refer to Engine and Transaxle Assembly - "Engine Room Under Cover") Remove the roll rod bracket (A). Tightening torque : Bolt (B): 107.9 - 127.5 N.m (11.0 - 13.0 kgf.m, 79.6 - 94.0 lb-ft)

Timing System - Removal

Disconnect the battery negative terminal. Turn the crankshaft damper pulley clockwise, and align its groove with the timing mark of the timing chain cover. Remove the timing chain cover. (Refer to Timing System - "Timing C