[특허]Accurate battery state-of-charge monitoring and indicating apparatus and method

Accurate battery state-of-charge monitoring and indicating apparatus and method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01M-010/48
출원번호	US-0557451 (1995-11-14)
발명자 / 주소	Proctor Richard L. (Seattle WA) Ure George A. (Kirkland WA) Merkes William L. (Seattle WA) Young Jr. Richard H. (Seattle WA) Kahle Steven H. (Edmonds WA)
출원인 / 주소	Cruising Equipment, Inc. (Seattle WA 02)
인용정보	피인용 횟수 : 59 인용 특허 : 0

초록 ▼

The 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

대표청구항 ▼

For a battery with a battery charger operatively connected thereto, wherein such battery has an experimentally defined charge capacity (CCAP) which is substantially based upon a depletion test, wherein such battery in a fully-charged condition is depleted over a depletion time period (T) while drawing a predefined discharging current (1) from such battery; a method of monitoring an accurate state-of-charge of a battery comprising: providing a less-than-fully-charged battery, wherein the battery has: a) an adjusted charge capacity (CCAPadj) which is satisfied by an equation CCAPadj=TㆍIP, wherein P is a Peukert constant which is experimentally defined by an equation P=(log T2-log T1)÷(log I1-log I2), wherein T1 and I1 are a period of time and discharging current respectively of a nominally first depletion test of the battery and T2 and I2 are a period of time and discharging current respectively of a nominally second depletion test of the battery such that I1 is greater than I2, which CCAPadj is stored in an associated memory; b) a state-of-charge (SOC) which is stored in an associated memory; and c) an adjusted state-of-charge SOCadj stored in an associated memory, wherein SOCadj is equal to SOC which has been adjusted to compensate for the Peukert Effect during discharging of the battery; charging the less-than-fully-charged battery with the battery charger by causing a charging current (z) to flow through the battery; measuring z and setting an adjusted charging current (zadj) equal to z; producing a charging compensation factor (COMF) wherein COMF is defined by an equation COMF=SOCadj÷SOC; modifying zadj so that zadj=zadjㆍCOMFㆍCEF, wherein CEF is a defined charging efficiency factor of the battery; incrementing SOCadj based on zadj while charging the battery.

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Accurate battery state-of-charge monitoring and indicating apparatus and method 원문보기

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