KIA Niro: Main/ Sub High Voltage Battery

Main High Voltage Battery

  1. Power Relay Assembly (PRA)
  2. Cell Monitoring Unit (CMU)
  3. Battery Temperature Sensor
  4. Runaway Arresting Device (RAD)

Warning

Main Relays (Positive, Negative), Pre-Charge Relay, Pre-Charge Resistor, and Battery Current Sensor are integrated into the PRA.

Sub High Voltage Battery

  1. BMS ECU
  2. Safety Plug
  3. Cell Monitoring Unit (CMU)
  4. Main Fuse
  5. Runaway Arresting Device (RAD)
  6. Battery Temperature Sensor

Warning

Main Relays (Positive, Negative), Pre-Charge Relay, Pre-Charge Resistor, and Battery Current Sensor are integrated into the PRA.

Schematic Diagram

Troubleshooting Flow

Troubleshooting Flow

BMS ECU Terminal and Input/Output Signal

BMS ECU Terminal and Input/Output Signal

Terminal Funxtion

Terminal Funxtion

Connector (B11-1A)

Connector (B11-1B)

Connector (B11-1B)

Connector (B11-2A)

Connector (B11-2A)

Connector (B11-2B)

Connector (B11-2B)

Sub High Voltage Battery - Removal

Sub High Voltage Battery - Removal

Warning

  • 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.
  • Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  1. Turn ignition switch OFF and disconnect the negative (-) battery terminal.
  2. Shut off the high voltage circuit.

    (Refer to Hybrid Control System - "High Voltage Shut-off Procedures")

  3. Remove the sub high voltage battery rear cover (A) after loosening the mounting bolts.

High Voltage Battery Rear Cover mounting bolt : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

  1. Remove the sub high voltage battery cover (A) after loosening the mounting bolts.

High Voltage Battery Cover mounting bolt : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

  1. Disconnect the BMS connector (A).
  2. Remove the BMS ECU after loosening the mounting nuts (B).

BMS ECU mounting nut : 7.8 - 11.8 N*m (0.8 - 1.2 kgf*m, 5.8 - 8.7 lb*ft)

Installation

Installation

Warning

  • 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.
  • Be sure to read and follow the "High Voltage Shut-off Procedures" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries.
  1. Install the BMS ECU in the reverse order of removal.

READ NEXT:

 Safety Plug Description and operation

Description Safety Plug is installed on the rear side of the high voltage battery and it can mechanically shut the high voltage circuit off when servicing the high voltage system. (i.e. High Voltage Battery, Power Relay Assembly, HPCU, BMS ECU

 The Power Relay Assembly

Specification Description The Power Relay Assembly (PRA) consists of the positive and negative main relays, pre-charge relay, pre-charge resistor and battery current sensor. It is located inside the battery pack assembly and controls the h

 Pre-Charge Relay

Specification Description The Power Relay Assembly (PRA) consists of the positive and negative main relays, pre-charge relay, pre-charge resistor and battery current sensor. It is located inside the battery pack assembly and controls the h

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 Special features

Hybrid vehicles sound different than gasoline engine vehicles. When the hybrid system operates, you may hear a sound from the hybrid battery system behind the rear seat. If you apply the accelerator pedal rapidly, you may hear an unconventional

 Plug-in hybrid vehicle components

* The actual shape may differ from the illustration. Engine: 1.6L Motor: 32 kW (HEV) / 62 kW (PHEV) Transmission: 6DCT Hybrid starter generator (HSG) HPCU (Hybrid Power Control Unit) High voltage battery system Regenerative brake