Method for compensating state of charge of battery and battery management system using the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01M-010/44
H01M-010/46
출원번호
UP-0643218
(2006-12-19)
등록번호
US-7649338
(2010-02-22)
우선권정보
KR-10-2005-0127124(2005-12-21)
발명자
/ 주소
Seo, Se-Wook
Yun, Han-Seok
Lim, Gye-Jong
출원인 / 주소
Samsung SDI Co., Ltd.
대리인 / 주소
Christie, Parker & Hale, LLP
인용정보
피인용 횟수 :
7인용 특허 :
2
초록▼
The present invention relates to a state of charge (SOC) compensation method of a battery and a battery management system using the SOC compensation method. The charge and discharge current of the battery is used to calculate a first SOC and a first voltage corresponding to the first SOC, the charge
The present invention relates to a state of charge (SOC) compensation method of a battery and a battery management system using the SOC compensation method. The charge and discharge current of the battery is used to calculate a first SOC and a first voltage corresponding to the first SOC, the charge and discharge current of the battery, the battery pack voltage, and an internal resistance of the battery are used to calculate a rheobasic voltage of the battery, an integration error corresponding to a difference between the first voltage and the rheobasic voltage is calculated, and a SOC compensation factor corresponding to the error is added to or subtracted from the first SOC to determine a more accurate SOC of the battery.
대표청구항▼
What is claimed is: 1. A state of charge compensation method for compensating a state of charge of a battery, the compensation method comprising: a) calculating a first state of charge of the battery and a first voltage corresponding to the first state of charge using a charge and discharge current
What is claimed is: 1. A state of charge compensation method for compensating a state of charge of a battery, the compensation method comprising: a) calculating a first state of charge of the battery and a first voltage corresponding to the first state of charge using a charge and discharge current of the battery; b) calculating a rheobasic voltage of the battery using the charge and discharge current of the battery, a voltage of the battery, and an internal resistance of the battery; c) calculating an integration error corresponding to a difference between the first voltage and the rheobasic voltage; d) determining whether the integration error is within a predetermined effective range; e) when the integration error falls outside the predetermined effective range, adding or subtracting a state of charge compensation factor to the first state of charge to obtain a compensated state of charge so that the compensated state of charge falls within a state of charge range corresponding to the predetermined effective range; and f) outputting the compensated state of charge to an external device as a present state of charge of the battery. 2. The state of charge compensation method of claim 1, wherein d) includes: determining whether the integration error is greater than a first threshold value; and when the integration error is not greater than the first threshold value, determining whether the integration error is less than a second threshold value, wherein the first threshold value and the second threshold value are limits of the predetermined effective range, and wherein when the integration error is not greater than the first threshold value and is not less than the second threshold value, a normal state is determined. 3. The state of charge compensation method of claim 2, wherein in e), when the integration error is greater than the first threshold value, the compensated state of charge is obtained by subtracting the state of charge compensation factor from the first state of charge, and when the integration error is less than the second threshold value, the compensated state of charge is obtained by adding the state of charge compensation factor to the first state of charge. 4. The state of charge compensation method of claim 2, wherein the first threshold value is a positive value, and the second threshold value is a negative value. 5. The state of charge compensation method of claim 4, wherein an absolute value of the first threshold value is different from an absolute value of the second threshold value. 6. The state of charge compensation method of claim 4, wherein an absolute value of the first threshold value is smaller than an absolute value of the second threshold value. 7. The state of charge compensation method of claim 1, wherein a) includes: measuring an integrated current using the charge and discharge current of the battery; calculating the first state of charge corresponding to the integrated current; and applying the first state of charge to a predetermined open circuit voltage table to calculate the first voltage. 8. A driving method for a battery management system connected to an engine control unit of a vehicle using electrical energy, the driving method comprising: a) measuring a charge and discharge current of a battery and a battery voltage; b) calculating a first state of charge and a first voltage corresponding to the first state of charge using the charge and discharge current of the battery; c) calculating a rheobasic voltage of the battery using the charge and discharge current of the battery, the battery voltage, and an internal resistance of the battery; d) calculating an integration error corresponding to a difference between the first voltage and the rheobasic voltage; e) determining whether the integration error is within a predetermined effective range; f) when the integration error falls outside the predetermined effective range, compensating the state of charge by adding or subtracting a state of charge compensation factor to the first state of charge to obtain a compensated state of charge so that the compensated state of charge is within a state of charge range corresponding to the predetermined effective range; and g) outputting the compensated state of charge to the engine control unit as a present state of charge of the battery. 9. The driving method of claim 8, wherein e) includes: determining whether the integration error is greater than a first threshold value; determining whether the integration error is less than a second threshold value, when the integration error is not greater the first threshold value; when the integration error is greater than the first threshold value, indicating that the integration error is greater than the first threshold value; when the integration error is less than the second threshold value, indicating that the integration error is less than the second threshold value; and when the integration error is not greater than the first threshold value and is not less than the second threshold value, indicating a normal state, wherein the first threshold value and the second threshold value are limits of the predetermined effective range. 10. The driving method of claim 9, wherein f) includes: when the integration error is greater than the first threshold value, compensating the state of charge by subtracting the state of charge compensation factor from the first state of charge, and when the integration error is less than the second threshold value, compensating the state of charge by adding the state of charge compensation factor to the first state of charge. 11. The driving method of claim 9, wherein the first threshold value is a positive value and the second threshold value is a negative value. 12. The driving method of claim 11, wherein an absolute value of first threshold value is different from an absolute value of the second threshold value. 13. The driving method of claim 11, wherein an absolute value of the first threshold value is smaller than an absolute value of the second threshold value. 14. The driving method of claim 9, wherein b) includes: measuring an integrated current by a current integration method using the charge and discharge current of the battery; calculating the first state of charge corresponding to the integrated current; and calculating the first voltage by applying the first state of charge to a predetermined open circuit voltage table. 15. The driving method of claim 9, wherein in g), when a normal state is indicated, the first state of charge is output to the engine control unit as the present state of charge of the battery. 16. A battery management system for managing a battery and outputting a state of charge of the battery to an engine control unit of a vehicle using electrical energy, the battery management system comprising: an integration state of charge calculator for calculating a first state of charge using a charge and discharge current of the battery; an integration voltage calculator for calculating an integrated voltage corresponding to the first state of charge; a rheobasic voltage calculator for calculating a rheobasic voltage using a battery voltage, the charge and discharge current of the battery, and an internal resistance of the battery; an effective range determination unit for calculating an integration error using the integrated voltage and the rheobasic voltage, determining whether the integration error is within a predetermined effective range, and outputting an effective range excess signal and an effective range below signal; a state of charge compensating unit for compensating the first state of charge by subtracting a state of charge compensation factor from the first state of charge when receiving the effective range excess signal and compensating the first state of charge by adding the state of charge compensation factor to the first state of charge when receiving the effective range below signal to obtain a compensated state of charge so that the compensated state of charge falls within a state of charge range corresponding to the predetermined effective range; and a state of charge outputting unit for outputting the compensated state of charge output by the state of charge compensating unit to the engine control unit as a present state of charge of the battery. 17. The battery management system of claim 16, wherein the effective range determination unit outputs the effective range excess signal when the integration error is greater than a first threshold value, outputs the effective range below signal when the integration error is less than a second threshold value, and outputs a normal state signal when the integration error is not greater than the first threshold value and is not less than the second threshold value. 18. The battery management system of claim 17, wherein the first threshold value is a positive value, and the second threshold value is a negative value. 19. The battery management system of claim 18, wherein an absolute value of the first threshold value is different from an absolute value of the second threshold value. 20. The battery management system of claim 19, wherein the absolute value of the first threshold value is smaller than an absolute value of the second threshold value. 21. The battery management system of claim 16, wherein the integration state of charge calculator uses a current integration method using the charge and discharge current of the battery to measure an integrated current, calculates the first state of charge corresponding to the measured integrated current, and applies the first state of charge to a predetermined open circuit voltage table to calculate the first voltage. 22. The battery management system of claim 17, wherein the state of charge outputting unit outputs the first state of charge as a present state of charge of the battery to the engine control unit when the effective range determination unit outputs a normal state signal to the state of charge compensating unit.
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이 특허에 인용된 특허 (2)
Kitajima Shinichi,JPX ; Izumiura Atsushi,JPX ; Uchida Keisuke,JPX ; Kumagai Katsuhiro,JPX ; Ukai Asao,JPX ; Fukuchi Hironao,JPX, Control system for hybrid vehicle.
Finger Eugene P. (Brewster NY) Sands Eugene A. (Scarsdale NY), Method and apparatus for measuring the state of charge of a battery by monitoring reductions in voltage.
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