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Battery management device, battery monitoring circuit, and control system

  • US 10,386,419 B2
  • Filed: 03/04/2016
  • Issued: 08/20/2019
  • Est. Priority Date: 03/11/2015
  • Status: Active Grant
First Claim
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1. A battery management device comprising:

  • a voltage detection unit that is electrically connected to both poles of each of a plurality of battery cells via a voltage detection line and detects each terminal voltage of the plurality of battery cells;

    a filter circuit that is configured using a resistor and a capacitor and electrically connected to the voltage detection line;

    a current source that repeatedly performs an energization operation to cause a current to flow to the voltage detection line in order to change a stored charge amount of the capacitor; and

    a diagnosis unit that diagnoses whether the resistor is in a normal state or an open state based on a result of detection of the terminal voltage performed by the voltage detection unit,wherein the current source performs the energization operation with a magnitude of a current that enables the stored charge amount changed by the energization operation performed once to fall within a range corresponding to a fluctuation width of the terminal voltage during the energization operation when the resistor is in the normal state,the diagnosis unit diagnoses that the resistor is in the open state when a difference between the terminal voltage detected at a current time and the terminal voltage detected at a past time is larger than a predetermined threshold value, andwherein the diagnosis unit diagnoses that the resistor is in the open state when the difference between the terminal voltage detected at the current time and the terminal voltage detected a predetermined diagnosis time before the current time is larger than the threshold value, andthe diagnosis time is set based on a time required until a voltage change of the voltage detection line, caused depending on a sum of the stored charge amount changed by a plurality times of the energization operations performed within the time, exceeds the threshold value when the resistor is in the open state.

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