Method and apparatus for estimating state of charge of secondary battery
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-027/416
H02J-007/00
출원번호
US-0953013
(2004-09-29)
등록번호
US-7355411
(2008-04-08)
우선권정보
JP-2003-343597(2003-10-01)
발명자
/ 주소
Murakami,Yusai
Yamabe,Norito
Minamiura,Keiichi
Kimura,Tadao
출원인 / 주소
Panasonic EV Energy Co., Ltd.
대리인 / 주소
Workman Nydegger
인용정보
피인용 횟수 :
2인용 특허 :
1
초록▼
When a power switch portion 10 is in an open state and a charge/discharge path of the secondary battery 100 is in a disconnected state, an electromotive force calculation portion 109 calculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage st
When a power switch portion 10 is in an open state and a charge/discharge path of the secondary battery 100 is in a disconnected state, an electromotive force calculation portion 109 calculates a battery electromotive force Veq by subtracting a polarized voltage Vpol stored in a polarized voltage storage portion 113 from an open-circuit voltage OCV measured by a voltage measurement portion 102. Based on the electromotive force, a state-of-charge estimation portion 110 estimates a state of charge SOC. Thus, a polarized voltage to be considered for the estimation of SOC can be limited. The state of charge (SOC) of a secondary battery can be estimated with high accuracy and quickly.
대표청구항▼
What is claimed is: 1. A method for estimating a state of charge of a secondary battery, comprising the steps of: preparing a switch in a charge/discharge path of the secondary battery; turning on the switch to connect the charge/discharge path of the secondary battery; calculating a no-load voltag
What is claimed is: 1. A method for estimating a state of charge of a secondary battery, comprising the steps of: preparing a switch in a charge/discharge path of the secondary battery; turning on the switch to connect the charge/discharge path of the secondary battery; calculating a no-load voltage of the secondary battery when the charge/discharge path of the secondary battery is in a connected state; turning off the switch to disconnect the charge/discharge path of the secondary battery; measuring an open-circuit voltage of the secondary battery when the charge/discharge path of the secondary battery is in a disconnected state; storing a polarized voltage of the secondary battery; calculating an electromotive force of the secondary battery by subtracting the stored polarized voltage from one of the calculated no-load voltage and the measured open-circuit voltage; and estimating the state of charge of the secondary battery based on the calculated electromotive force. 2. A method for estimating a state of charge of a secondary battery, wherein the secondary battery is used in an intermediately charged state as a power source for a motor and a drive source for a load, the method comprising the steps of: preparing a switch in a charge/discharge path of the secondary battery; turning on the switch to connect the charge/discharge path of the secondary battery; calculating a no-load voltage of the secondary battery when the charge/discharge path of the secondary battery is in a connected state; turning off the switch to disconnect the charge/discharge path of the secondary battery; measuring an open-circuit voltage of the secondary battery when the charge/discharge path of the secondary battery is in a disconnected state; storing a polarized voltage of the secondary battery; calculating an electromotive force of the secondary battery by subtracting the stored polarized voltage from one of the calculated no-load voltage and the measured open-circuit voltage; and calculating the state of charge of the secondary battery based on the calculated electromotive force. 3. The method according to claim 1, further comprising: determining whether or not the charge/discharge path is in the disconnected state; and measuring a terminal voltage of the secondary battery as the open-circuit voltage when it is determined in the determining step that the charge/discharge path is in the disconnected state. 4. The method according to claim 3, further comprising: measuring a current flowing through the secondary battery, wherein in the determining step, it is determined based on a value of the measured current whether or not the charge/discharge path is in the disconnected state. 5. The method according to claim 1, further comprising: measuring a current flowing through the secondary battery; calculating a charge/discharge amount of the secondary battery based on the measured current; and calculating the polarized voltage based on the calculated charge/discharge amount. 6. The method according to claim 5, wherein in the polarized voltage calculating step, the polarized voltage is calculated based on a look-up table or an expression that stores characteristics of the polarized voltage versus the charge/discharge amount where a temperature is a parameter, the characteristics being previously obtained. 7. The method according to claim 1, wherein in the state-of-charge estimating step, the state of charge is estimated based on a look-up table or an expression that stores characteristics of the state of charge versus the electromotive force where a temperature is a parameter, the characteristics being previously obtained. 8. An apparatus for estimating a state of charge of a secondary battery, comprising: a switch provided in a charge/discharge path of the secondary battery; a voltage measurement portion for turning off the switch to disconnect the charge/discharge path of the secondary battery and measuring an open circuit voltage of the secondary battery when the charge/discharge path of the secondary battery is in a disconnected state; a no-load voltage calculation portion for calculating a no-load voltage of the secondary battery when the switch is turned on and the charge/discharge path of the secondary battery is in a connected state: a polarized voltage storage portion for storing a polarized voltage of the secondary battery; an electromotive force calculation portion for calculating an electromotive force of the secondary battery by subtracting the polarized voltage stored in the polarized voltage storage portion from one of the no-load voltage calculated by the no-load voltage calculation portion and the open-circuit voltage measured by the voltage measurement portion; and a state-of-charge estimation portion for estimating the state of charge of the secondary battery based on the electromotive force from the electromotive force calculation portion. 9. An apparatus for estimating a state of charge of a secondary battery, wherein the secondary battery is used in an intermediately charged state as a power source for a motor and a drive source for a load, the apparatus comprising: a switch provided in a charge/discharge path of the secondary battery; a voltage measurement portion for turning off the switch to disconnect the charge/discharge path of the secondary battery and measuring an open circuit voltage of the secondary battery when the charge/discharge path of the secondary battery is in a disconnected state; a no-load voltage calculation portion for calculating a no-load voltage of the secondary battery when the switch is turned on and the charge/discharge path of the secondary battery is in a connected state; a polarized voltage storage portion for storing a polarized voltage of the secondary battery; an electromotive force calculation portion for calculating an electromotive force of the secondary battery by subtracting the polarized voltage stored in the polarized voltage storage portion from one of the no-load voltage calculated by the no-load voltage calculation portion and the open-circuit voltage measured by the voltage measurement portion; and a state-of-charge estimation portion for estimating the state of charge of the secondary battery based on the electromotive force from the electromotive force calculation portion. 10. The apparatus according to claim 8, further comprising: a disconnected state determination portion for determining whether or not the charge/discharge path is in the disconnected state, wherein a terminal voltage of the secondary battery measured by the voltage measurement portion is used as the open-circuit voltage when it is determined by the disconnected state determination portion that the charge/discharge path is in the disconnected state. 11. The apparatus according to claim 10, further comprising: a current measurement portion for measuring a current flowing through the secondary battery, wherein the disconnected state determination portion determines based on a value of the current measured by the current measurement portion whether or not the charge/discharge path is in the disconnected state. 12. The apparatus according to claim 8, further comprising: a current measurement portion for measuring a current flowing through the secondary battery; a charge/discharge amount calculation portion for calculating a charge/discharge amount of the secondary battery based on the current measured by the current measurement portion; and a polarized voltage calculation portion for calculating the polarized voltage based on the charge/discharge amount calculated by the charge/discharge amount calculation portion. 13. The apparatus according to claim 12, further comprising: a temperature measurement portion for measuring a temperature of the secondary battery, wherein the polarized voltage calculation portion calculates the polarized voltage based on the temperature measured by the temperature measurement portion and a look-up table or an expression that stores characteristics of the polarized voltage versus the charge/discharge amount where the temperature is a parameter, the characteristics being previously obtained. 14. The apparatus according to claim 8, further comprising: a temperature measurement portion for measuring a temperature of the secondary battery, wherein the state-of-charge estimation portion estimates the state of charge based on the temperature measured by the temperature measurement portion and a look-up table or an expression that stores characteristics of the state of charge versus the electromotive force where the temperature is a parameter, the characteristics being previously obtained. 15. The method according to claim 2, further comprising: determining whether or not the charge/discharge path is in the disconnected state; and measuring a terminal voltage of the secondary battery as the open-circuit voltage when it is determined in the determining step that the charge/discharge path is in the disconnected state. 16. The method according to claim 2, further comprising: measuring a current flowing through the secondary battery; calculating a charge/discharge amount of the secondary battery based on the measured current; and calculating the polarized voltage based on the calculated charge/discharge amount. 17. The method according to claim 2, wherein in the state-of-charge estimating step, the state of charge is estimated based on a look-up table or an expression that stores characteristics of the state of charge versus the electromotive force where a temperature is a parameter, the characteristics being previously obtained. 18. The apparatus according to claim 9, further comprising: a disconnected state determination portion for determining whether or not the charge/discharge path is in the disconnected state, wherein a terminal voltage of the secondary battery measured by the voltage measurement portion is used as the open-circuit voltage when it is determined by the disconnected state determination portion that the charge/discharge path is in the disconnected state. 19. The apparatus according to claim 9, further comprising: a current measurement portion for measuring a current flowing through the secondary battery; a charge/discharge amount calculation portion for calculating a charge/discharge amount of the secondary battery based on the current measured by the current measurement portion; and a polarized voltage calculation portion for calculating the polarized voltage based on the charge/discharge amount calculated by the charge/discharge amount calculation portion. 20. The apparatus according to claim 9, further comprising: a temperature measurement portion for measuring a temperature of the secondary battery, wherein the state-of-charge estimation portion estimates the state of charge based on the temperature measured by the temperature measurement portion and a look-up table or an expression that stores characteristics of the state of charge versus the electromotive force where the temperature is a parameter, the characteristics being previously obtained.
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이 특허에 인용된 특허 (1)
Charles E. Howard ; Keith E. West ; Douglas A. Gremaux ; James D. Baker ; H. Edward Kelwaski, Vehicle battery condition monitoring system.
Choi, Loo-Ney; Seo, Ki-Ho; Murakami, Yusai, Battery management system, method of removing polarization voltage of battery, and estimating state of charge of battery.
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