Patents Assigned to Cobasys, LLC
  • Patent number: 7375497
    Abstract: A battery control module for a battery system comprises a voltage measuring module that measures battery and a current measuring module that measures battery current. A state of charge (SOC) module communicates with the current and voltage measuring modules and estimates SOC at least one of when an accumulated charge swing during charge is greater than or equal to an accumulated discharge swing during a prior discharge and a negative of a charge current is within a predetermined window of a negative of a retained discharge current during the prior discharge and/or when an accumulated discharge swing during discharge is greater than or equal to an accumulated charge swing during a prior charge and a negative of a discharge current is within a predetermined window of a negative of a retained charge current during the prior charge.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: May 20, 2008
    Assignee: Cobasys, LLC
    Inventor: Robert Melichar
  • Patent number: 7333902
    Abstract: A system for determining an operating limit of at least one battery according to some embodiments of the present invention comprises a voltage module that measures a voltage V across at least one battery during first and second periods. A current sensor that measures current I supplied by the at least one battery during the first and second periods. A limit module estimates an ohmic resistance R0 based on at least one of a temperature of the at least one battery and a time difference between the first and second periods, and that estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at the second period based on the voltage V and current I of the at least one battery at the first period and an ohmic resistance R0 of the at least one battery.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: February 19, 2008
    Assignee: Cobasys, LLC
    Inventor: Robert J. Melichar
  • Patent number: 7209841
    Abstract: A system for determining an operating limit of at least one battery according to some embodiments of the present invention comprises a voltage module that measures a voltage V across at least one battery during first and second periods. A current sensor that measures current I supplied by the at least one battery during the first and second periods. A limit module estimates a sum of a polarization voltage VP and an open circuit voltage V0 of the at least one battery at the second period based on the voltage V and current I of the at least one battery at the first period and an ohmic resistance R0 of the at least one battery.
    Type: Grant
    Filed: November 15, 2004
    Date of Patent: April 24, 2007
    Assignee: Cobasys, LLC
    Inventor: Robert J Melichar