[특허]Battery capacity calculation method

[미국특허] Battery capacity calculation method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-027/416
출원번호	US-0472420 (1995-06-07)
우선권정보	JP-0072143 (1995-03-29)
발명자 / 주소	Marritt William A.,JPX Yamazaki Toshihiko,JPX
출원인 / 주소	Seiko Epson Corporation, JPX
대리인 / 주소	Oliff & Berridge PLC
인용정보	피인용 횟수 : 62 인용 특허 : 0

초록 ▼

A battery capacity meter and a method for precisely calculating a battery capacity are obtained by measuring a terminal voltage of the battery and sequentially calculating the measured terminal voltages. In a battery capacity meter of the present invention, a calculation process is carried out. After a power source is connected to the battery capacity meter, an initial value S.sub.0 under non-consistent charge state S.sub.i is calculated from an initial value V.sub.0 of a terminal voltage V.sub.i. Next, V.sub.i and S.sub.i are related to a current I.sub.i, and an equation for relating a variation amount .DELTA.S.sub.i of S.sub.i to S.sub.i is formed. Under this relationship, .DELTA.S.sub.i is obtained from V.sub.i and S.sub.i in a time interval .DELTA.t. A value of S.sub.i is updated. Either a remaining capacity or a fuel-gauge normalized remaining capacity are obtained from the updated value of S.sub.i. A process operation is returned to a step where .DELTA.S.sub.i is calculated, and this process is repeated.

대표청구항 ▼

[ What is claimed is:] [1.] A method for determining battery capacity comprising the steps of:a) measuring an initial value V.sub.0 of a terminal voltage of a battery to obtain an initial state of charge condition value S.sub.0 of an indication value S indicative of a state of charge condition of the battery, in which S is defined to be equal to 0 when the battery is fully charged and is defined to be equal to 1 when the battery is effectively discharged;b) determining a subsequent value V.sub.i of a terminal voltage after a time interval .DELTA.t and estimating a discharge current value I based on the determined subsequent value V.sub.i ;c) calculating a change .DELTA.S.sub.0 in the initial value state of charge condition S.sub.0 of the battery over the time interval .DELTA.t as a function of the discharge current value I and the initial state of charge condition indication value S.sub.0 using the following equation: EQU .DELTA.S.sub.0 =I.sub.i .times..DELTA.t.times.f(I.sub.i, S.sub.0).div.M rein an average battery discharge current corresponding to said discharge current value I is I.sub.i, where f(I.sub.i,S.sub.0) is a function such that when S.sub.0 =0 f(I.sub.i,S.sub.0)=.times.1; when S.sub.0 =1, f(I.sub.i,S.sub.0)=1 if I.sub.i is low, f(I.sub.i S.sub.0)=(I.sub.i .div.I.sub.0).sup.Y if I.sub.i is high, and f(I.sub.i,S.sub.0) increases monotonically when S.sub.0 is increased from 0 to 1; and M, I.sub.0, and Y are constants depending on the battery;d) updating the state of charge condition by calculating a current state of charge condition value S.sub.i of the indication value S, wherein S.sub.i =S.sub.0 +.DELTA.S.sub.0 ;e) repeating step b;f) calculating a change .DELTA.S.sub.i in the current state of charge condition value S.sub.i of the battery over the time interval .DELTA.t as a function of the discharge current value I.sub.i and the state of charge condition indication value S.sub.i using the following equation; EQU .DELTA.S.sub.i =I.sub.i .times..DELTA.t.times.f(I.sub.i, S.sub.i).div.M rein f(I.sub.i,S.sub.i) is a function such that when S.sub.i =0, f(I.sub.i,S.sub.i)=1; when S.sub.i =1, f(I.sub.i S.sub.i)=1 if I.sub.i is low, f(I.sub.i S.sub.i)=(I.sub.i .div.I.sub.0).sup.Y if I.sub.i is high, and f(I.sub.i,S.sub.i) increases monotonically when S.sub.i is increased from 0 to 1; and M, I.sub.0, and Y are constants depending on the battery; andg) updating the state of charge condition by calculating a new value S.sub.i+1 of the indication value S indicative of a new state of charge condition of the battery from the equation: EQU S.sub.i+1 =S.sub.i +.DELTA.S.sub.i.

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[미국특허] Battery capacity calculation method 원문보기

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