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DIAGNOSTIC SYSTEM FOR A BATTERY SYSTEM

  • US 20170373356A1
  • Filed: 05/28/2017
  • Published: 12/28/2017
  • Est. Priority Date: 06/27/2016
  • Status: Active Grant
First Claim
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1. A diagnostic system for a battery system, the battery system having a battery module electrically coupled to a contactor, the battery module having first, second, and third battery cells, comprising:

  • a first microcontroller obtaining a first initialization value and first, second, and third battery cell analog overvoltage flag values from a memory device, the first, second, and third analog overvoltage flag values being associated with the first, second, and third battery cells, respectively;

    the first microcontroller further obtaining a second initialization value and first, second, and third battery cell comparator overvoltage flag values from the memory device, the first, second, and third battery cell comparator overvoltage flag values being associated with the first, second, and third battery cells, respectively;

    the first microcontroller initializing each of first, second, and third battery cell analog overvoltage flags to the first initialization value;

    the first microcontroller receiving first, second, and third output voltage values from a second microcontroller, the first, second, and third output voltage values corresponding to first, second, and third output voltages, respectively, from the first, second, and third battery cells, respectively;

    the first microcontroller setting the first battery cell analog overvoltage flag equal to the first battery cell analog overvoltage flag value if the first output voltage value is greater than a first threshold voltage value;

    the first microcontroller setting the second battery cell analog overvoltage flag equal to the second battery cell analog overvoltage flag value if the second output voltage value is greater than the first threshold voltage value;

    the first microcontroller setting the third battery cell analog overvoltage flag equal to the third battery cell analog overvoltage flag value if the third output voltage value is greater than the first threshold voltage value; and

    the first microcontroller transitioning the contactor to an open operational state if the first battery cell analog overvoltage flag is equal to the first battery cell analog overvoltage flag value or the second battery cell analog overvoltage flag equal to the second battery cell analog overvoltage flag value or the third battery cell analog overvoltage flag equal to the third battery cell analog overvoltage flag value;

    the first microcontroller initializing each of first, second, and third battery cell comparator overvoltage flags to the second initialization value;

    the first microcontroller receiving first, second, and third comparator bits from the second microcontroller;

    the first comparator bit having a first fault value if the first output voltage is greater than a voltage comparator threshold voltage;

    the second comparator bit having the first fault value if the second output voltage is greater than the voltage comparator threshold voltage;

    the third comparator bit having the first fault value if the third output voltage is greater than voltage comparator threshold voltage;

    the voltage comparator threshold voltage having a magnitude that is greater than the first threshold voltage value;

    the first microcontroller setting the first battery cell comparator overvoltage flag equal to the first battery cell comparator overvoltage flag value if the first comparator bit is equal to the first fault value;

    the first microcontroller setting the second battery cell comparator overvoltage flag equal to the second battery cell comparator overvoltage flag value if the second comparator bit is equal to the first fault value;

    the first microcontroller setting the third battery cell comparator overvoltage flag equal to the third battery cell comparator overvoltage flag value if the third comparator bit is equal to the first fault value; and

    the first microcontroller transitioning the contactor to the open operational state if the first battery cell comparator overvoltage flag is equal to the first battery cell comparator overvoltage flag value or the second battery cell comparator overvoltage flag is equal to the second battery cell comparator overvoltage flag value or the third battery cell comparator overvoltage flag is equal to the third battery cell comparator overvoltage flag value.

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