Hybrid Battery Pack Deterioration

As a hybrid crosses the 100k mile mark and the vehicle takes on a new life in its older years the battery systems that power the drivetrain will start to wear out and fail. That may include but is not limited to vehicles from honda accord civic insight toyota prius camry lexus etc. The battery ecu calculates the resistance of the hv battery through amperage and voltage and uses this resistance to determine the extent of deterioration of the hv battery.

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Code p0a7f stands for hybrid battery pack deterioration hybrid vehicles have high voltage nickel metal hydride or lithium ion batteries.

Hybrid battery pack deterioration.

This battery deterioration means that the individual cells within the battery pack can have a different charge level and capacity they are no longer in sync with each other. If the battery ecu detects that the resistance of the hv battery has exceeded the standard it determines that malfunction has occurred. While there s no onboard test for the lifespan or health of the battery the best indicator of a properly functioning pack is the vehicle s fuel economy. The high voltage hv battery is used to power the electric drive motor s.

Hybrid battery pack deterioration what does that mean. The unused capacity undergoes a correctable degradation process that reduces battery capacity. It is also used to store energy recovered during regenerative braking and when the motor s are act as generators. The driving cycle of a hybrid vehicle subjects the battery pack to repeated shallow depths of discharge of less than 10 of the battery capacity.

Some cells can be full while other cells in the same battery pack are empty. This is a generic diagnostic trouble code dtc and applies to many obd ii vehicles 1996 newer.