Accurate battery state-of-charge monitoring and indicating apparatus and method
November 14, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3886442 Portable heart monitor Battery testing apparatus Battery control system for battery operated vehicles Monitoring apparatus and method for battery power supply Maleic anhydride process Device indicating the time remaining of the useful life of a battery Charge depletion meter Bidirectional current time integration device Battery test circuit for a heart pacemaker InventorsAssigneeApplicationNo. 557451 filed on 11/14/1995US Classes:320/153, Temperature compensation324/427, To determine ampere-hour charge capacity340/636.13, By current340/636.15, By voltage429/90WITH MEASURING, TESTING, OR INDICATING MEANSExaminersPrimary: Tso, Edward H.Attorney, Agent or FirmInternational ClassH01M 010/48AbstractThe apparatus and method of monitoring and/or indicating an accurate state-of-charge of a battery compensates for varying current loads and changing temperature conditions. The apparatus and method compensate for the Peukert Effect which manifests itself when varying current loads are applied to the battery. Also, the apparatus and method may compensate for temperature changes in the environment of the battery. The extent of the Peukert Effect and temperature variation on the battery is based on intrinsic characteristics of the battery which may be experimentally defined. Specifically, preferred apparatuses include memories for storing various discharging/charging related values and a processor to calculate and determine values related to accurately monitoring the battery's state-of-charge. Also, the apparatus may include a battery state-of-charge indicator including a multi-segmented, multi-color LED display. The apparatuses and methods use a battery having a state-of-charge equal to the battery's charge capacity (CCAP). The battery's state-of-charge is tracked as it discharges/charges. Preferably, if the discharging current (i) is greater than or equal to a predefined discharging current (I), then the Peukert Equation is utilized to determine the actual discharge of the battery. If I<i, then Peukert Equation is not utilized because the Peukert Effect is not exhibited when i is below I.Other References
Field of SearchTo determine ampere-hour charge capacityIncluding an integrating device With temperature compensation of measured condition To compare battery voltage with a reference voltage Condition of electrical apparatus WITH MEASURING, TESTING, OR INDICATING MEANS WITH CONTROL MEANS RESPONSIVE TO BATTERY CONDITION SENSING MEANS |
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