General Information

HEV Battery System
P1B03 Auxiliary Battery Temperature Sensor Circuit - 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 takes the measured temperature from an Auxiliary Battery Temperature Sensor which is located above an Auxiliary Battery. If the measured temperatures is more than110°C(230°F) or is less than -45°C(-49°F), BMS ECU detects this DTC.
During existence of an current DTC the service lamp turns on, If it is recovery to a normal state, the current DTC will delete after lasting 2 terms driving cycle(IG ON /OFF), and thengenerate a historic DTC( H character is displayed at the end of the DTC code).
At the same time the service lamp turns off, the GDS could delete the historic DTC.

DTC Detecting Condition





Specification





Diagnostic Circuit Diagram






















Signal Waveform & Data








Fig.1) Current Data at EV mode after disconnecting Auxiliary Battery temperature sensor connector : Auxiliary Battery temperature is 127°C(260.6°F)
Fig.2) SOC 44.5% of high voltage battery : Auxiliary Battery temperature sensors are displayed as 30°C(86°F)