Patent ID: 9387773
Filing Date: 2016-07-12
CPC Classification: B60L,H01M,H02J,Y02E,Y02T

Claim Text:
1. A system for derating a power limit associated with a battery pack, comprising: a battery pack voltage sensor configured to measure a first battery pack output voltage of the battery pack at a first time; a microprocessor programmed to operably communicate with the battery pack voltage sensor, the microprocessor further programmed to determine an initial power limit of the battery pack based on at least one operational parameter of the battery pack; the microprocessor further programmed to determine whether the first battery pack output voltage is less than a first voltage; the microprocessor further programmed to determine whether the first battery pack output voltage is greater than a threshold battery pack voltage, if the first battery pack output voltage is less than the first voltage; the threshold battery pack voltage being less than the first voltage, the threshold battery pack voltage being greater than zero volts; the microprocessor further programmed to determine whether the initial power limit is equal to a minimum power limit of the battery pack, if the first battery pack output voltage is greater than the threshold battery pack voltage and less than the first voltage; the microprocessor further programmed to determine a first power limit of the battery pack that is less than the initial power limit, if the first battery pack output voltage is greater than the threshold battery pack voltage and less than the first voltage, and the initial power limit is not equal to the minimum power limit of the battery pack; the microprocessor further programmed to transmit a first message having the first power limit on a communication bus; and a control circuit configured to selectively electrically decouple the battery pack from a vehicle inverter if the battery pack output voltage is greater than the first voltage, in response to a control signal from the microprocessor.