Durango 2WD V8-5.7L Hybrid (2009)
Battery, Hybrid Drive: Description and Operation
High Voltage Battery - Operation
300V
BATTERY PACK
The HEV battery contains 240, 1.2-Volt Nickel-Metal Hydride cells. These cells are in modules of six cells each, connected in series. You should see:
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300-310 Volts at 60% State of Charge (SOC) with contactors open.
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240-390 Volts during normal operation.
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216 Volts during worst case, cold cranking.
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60% +/- 8% State of Charge (SOC).
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358 Volts is upper limit during jump assist.
BATTERY PACK CONTROL MODULE (BPCM)
The BPCM communicates on the Hybrid Local Area Network (LAN) with the HCP, the Transmission Electro-Hydraulic Control Module (TEHCM),
Accessory Power Module (APM) and Hybrid Gateway Module (HGM). The HGM also sends messages from the BPCM across the CAN-C network for
use by other modules.
Most BPCM communications are with the HCP. As the HCP controls the hybrid drivetrain, the BPCM make sure that the HV battery pack can supply
the necessary HV current so that the vehicle can be driven. The BPCM notifies the HCP that current from the battery pack should be limited because of
battery temperature or SOC.
The BPCM controls the functions of the HV Battery Pack. The BPCM provides control outputs to:
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Positive and Negative Contactors
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Pre-Charge Contactor
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HV Battery Cooling Fan
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HVIL Source Current
The BPCM monitors the following inputs:
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Hybrid LAN Messages
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HV Module Voltages (20 Inputs)
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Total HV Battery Voltage
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HV Battery Current
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HVIL Circuit Current
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Battery Pack Isolation Resistance (Measured Impedance)
HIGH VOLTAGE INTERLOCK CIRCUIT (HVIL)
The HVIL circuit helps prevent access to high voltage. The BPCM provides an output current across the HVIL circuit and monitors the return current to
verify the integrity of the HVIL circuit. Both the current drivers and return current can be read with the scan tool. Both readings should be approximately
12mA.
The BPCM contains the current drivers that provide the source current for the HVIL circuit. The HVIL circuit routes in series from the BPCM through
the HVIL connectors at the HV components.
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The circuit passes through a connector near the bulkhead and another connector under hood to the HVIL connector over the TPIM cover bolts.
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From this connector, the circuit enters the HCP through the 56-pin connector on the front of the TPIM.
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From the 56-pin connector, the circuit goes through a connector on the air cleaner duct.
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The circuit then goes to the EVT HV cover HVIL connector.
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From the EVT HVIL connector the circuit goes to the EAC connector.
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From the EAC connector the circuit routes back to the BPCM through the under hood connector and the connector near the bulkhead.
The HVIL circuit routes through the HCP in the TPIM. The HCP also monitors the HVIL current with solid-state circuitry.
The BPCM can detect a, open circuit, short to ground and short to power failures on the HVIL circuit. A distinct DTC sets for each type of failure and is
reported to the HCP. This illuminates the HEV service lamp and disables the HV system. This results in a no-start condition and disables the vehicle if
the vehicle is operating at the time.
If an HVIL circuit fault indicates, the HVIL circuit is diagnosed by measuring the resistance across the segments of the circuit. By measuring segments,
the fault is narrowed down to a specific section of the circuit.
