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Non-intrusive correlating battery monitoring system and method

  • US 10,295,608 B2
  • Filed: 07/13/2015
  • Issued: 05/21/2019
  • Est. Priority Date: 07/18/2014
  • Status: Active Grant
First Claim
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1. A battery monitoring system comprising:

  • a. a plurality of battery temperature probes each adapted to sense the temperature of an associated lead acid battery or lead acid battery string, each battery temperature probe being adapted to be non-intrusively mounted on or adjacent its associated battery or battery string;

    b. an ambient temperature probe adapted to sense the ambient temperature of an environment in which the batteries are located;

    c. a plurality of current sensors each adapted to sense a charge current delivered to an associated battery string during a charging event and a discharge current delivered from an associated battery strings during a discharging event, each current sensor being adapted to non-intrusively measure the charge current and the discharge current; and

    d. a controller configured to;

    i. receive associated data from the battery temperature probes, the ambient temperature probe and the current sensors;

    ii. calculate a plurality of temperature deltas between the ambient temperature and each of the battery or battery string temperatures;

    iii. generate a thermal event alarm if any of the temperature deltas exceed a user-defined thermal event temperature delta and any of the charge currents exceed a user-defined thermal event charge current;

    iv. determine if there has been a discharge or recharge event within a period of time;

    v. predict;

    A. a thermal runaway condition, by correlating charging and discharging currents, discharge/recharge events and temperature deltas and determining that all of the following are satisfied;

    there has not been a discharge or recharge event for the period of time, any of the temperature deltas exceed a user-defined thermal runaway temperature delta, and any of the charge currents exceed a user-defined thermal runaway charge current; and

    B. a battery end of service life condition, by correlating charging and discharging currents, discharge/recharge events and temperature deltas and determining that all of the following are satisfied;

    there has not been a discharge or recharge event for the period of time, the temperature deltas are below a user-defined battery aging temperature delta, and any of the charge currents exceed a user-defined battery aging charge current; and

    vi. generate;

    A. a thermal runaway alarm in response to predicting the thermal runaway condition and before the thermal runaway condition has occurred; and

    B. a battery end of service life condition alarm in response to predicting the battery end of service life condition.

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