General Information

HEV Battery System
P1B96 High Voltage Battery Voltage Sensor Circuit Fault - General Information

Component Location





General Description

** What is the High Voltage Battery System ?
The High Voltage Battery System consists of the Battery Management System Control Unit (BMS-ECU), Power Relay Assembly (PRA) and a Cooling Blower.
Each function is listed below :
- High Voltage Battery: Supplies electrical energy for acceleration and receives/stores electrical energy during deceleration.
- BMS ECU: Controls the High Voltage Battery by monitoring the voltage, current and temperature.
- PRA(Power relay assembly)consists of relays which link and cut high voltage, and finally, current sensor which monitors battery current. Those are an assembly in PRA.
- A safety plug : It can cut high voltage flowing as mechanically in order to protect technicians. And, there is a safety fuse in the safety plug that protect over current.
- Cooling Blower: Maintains proper High Voltage Battery temperature.
** The battery cell function and roles :
The High Voltage battery cell is the smallest unit of the High Voltage Battery pack.
The voltage of each cell is 3.75V. The battery pack will attain 270V by connecting all 72 cells in a series.
The BMS ECU monitors all of the 72 high-voltage cells, 5 battery temperature sensors, an ambient temperature sensor, a current sensor which checks the main battery and an auxiliary battery temperature sensor.
** The High-voltage battery specification is shown below :
Operating Voltage : for a battery pack : 200 - 310V (for a battery cell: 2.75 - 4.3)
Operating temperature : -30°C(-22°F)~55°C(131°F)
Storage temperature : -40°C(-40°F)~65°C(149°F)
Operating Current : During charge (-)200A~ During discharge (+)200A.
Field action when High Voltage Battery discharges






DTC Description

BMS ECU sets DTC P1B96 when the difference among each other the voltage of hybird battery cell is large and it is abnormal, it is generate by the difference among each other hybrid battery cell is more than 1.0 V.
If This DTC is set, BMS ECU will turn on the service lamp in the cluster.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram






















Signal Waveform & Data
















Fig.1) SOC 46% of high voltage battery - in the EV Mode, Max. Cell Voltage : 3,8V, Min. Cell Voltage : 3.76V and MCU Cap. Voltage : 274V
Fig.2) SOC 48% of high voltage battery - in the Driving EV Mode, Max. Cell Voltage : 3,8V, Min. Cell Voltage : 3.76V and MCU Cap. Voltage : 274V
Fig.3) SOC 45.5% of high voltage battery - in the Accelration EV Mode, Max. Cell Voltage : 3,78V, Min. Cell Voltage : 3.74V and MCU Cap. Voltage : 271V
Fig.4) SOC 40% of high voltage battery - After disconnecting High Voltage Battery Voltage Sensor connector at EV mode(Battery DC Voltage 6553.500V)