Charged state estimating device and charged state estimating method of secondary battery
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01V-003/18
H02J-007/00
출원번호
US-0086696
(2006-11-30)
등록번호
US-8274291
(2012-09-25)
우선권정보
JP-2005-375730 (2005-12-27)
국제출원번호
PCT/JP2006/324409
(2006-11-30)
§371/§102 date
20080618
(20080618)
국제공개번호
WO2007/074614
(2007-07-05)
발명자
/ 주소
Tsuchiya, Kenji
출원인 / 주소
Toyota Jidosha Kabushiki Kaisha
대리인 / 주소
Oliff & Berridge, PLC
인용정보
피인용 횟수 :
10인용 특허 :
9
초록▼
When a battery current is not larger than a limit current set depending on the battery temperature and is flowing continuously for a predetermined time set depending on the battery temperature or longer, a decision is made that a secondary battery is in stable state. When the secondary battery is in
When a battery current is not larger than a limit current set depending on the battery temperature and is flowing continuously for a predetermined time set depending on the battery temperature or longer, a decision is made that a secondary battery is in stable state. When the secondary battery is in stabilized state, the battery voltage is considered to be equal to the open circuit voltage and SOC estimation is performed based on the open circuit voltage-SOC characteristics. When the product of the internal resistance of the secondary battery and the limit current is made substantially constant (constant voltage) by setting the limit current in association with temperature dependence of the internal resistance, estimation error can be kept within a predetermined range in the stabilized state even if SOC estimation is performed while the battery voltage is assumed as the open circuit voltage. Consequently, SOC can be estimated with high precision within a predetermined error by a simple and reliable system under stabilized state.
대표청구항▼
1. A device for estimating a charged state of a secondary battery provided with a detector capable of detecting an input/output current, an output voltage and a battery temperature, comprising: a characteristic storing means for storing a characteristic relation between an open circuit voltage and a
1. A device for estimating a charged state of a secondary battery provided with a detector capable of detecting an input/output current, an output voltage and a battery temperature, comprising: a characteristic storing means for storing a characteristic relation between an open circuit voltage and a remaining capacity of said secondary battery;a stable state determining means for determining whether said secondary battery operates in a stable state in which said input/output current is maintained not higher than a limit current set in accordance with said battery temperature for at least a voltage stabilizing period set in accordance with said battery temperature, wherein said limit current increases as said battery temperature increases: anda first charged state estimating means for estimating the remaining capacity of said secondary battery based on the characteristic relation stored in said characteristic storing means, regarding said output voltage as said open circuit voltage, when said secondary battery is determined to be operating in said stable state. 2. The device for estimating a charged state of a secondary battery according to claim 1, further comprising a second charged state estimating means for estimating the remaining capacity of said secondary battery when the secondary battery is determined not to be operating in said stable state by said stable state determining means; whereinsaid second charged state estimating means estimates the remaining capacity of said secondary battery by a procedure of successively calculating an amount of change in said remaining capacity based on an integrated value of said input/output current or a procedure based on a battery model using said input/output current, said output voltage and said battery temperature as input variables. 3. The device for estimating a charged state of a secondary battery according to claim 2, wherein said second charged state estimating means includesa first estimating means for estimating the remaining capacity of said secondary battery by calculating the amount of change in said remaining capacity based on an integrated value of said input/output current,a second estimating means for estimating the remaining capacity of said secondary battery based on the battery model using said input/output current, said output voltage and said battery temperature as input variables, anda timer means for measuring duration of continuous execution of the estimation of remaining capacity by said first estimating means; andsaid second charged state estimating means estimates said remaining capacity by selecting said first estimating means when said duration of continuous execution is within a first limit time period, and estimates said remaining capacity by selecting said second estimating means when said duration of continuous execution exceeds said first limit time period and said input/output current is in a prescribed range that allows use of the battery model. 4. The device for estimating a charged state of a secondary battery according to claim 3, wherein said second charged state estimating means estimates said remaining capacity by selecting said second estimating means, when said duration of continuous execution exceeds a second limit time period longer than said first limit time period, regardless of said input/output current. 5. The device for estimating a charged state of a secondary battery according to claim 3, wherein said second charged state estimating means estimates said remaining capacity by selecting said first estimating means, when said duration of continuous execution exceeds said first limit time period and said input/output current is out of said prescribed range that allows use of the battery model. 6. The device for estimating a charged state of a secondary battery according to claim 1, wherein said voltage stabilizing period in said stable state determining means is set relatively short as said battery temperature increases. 7. A method of estimating a charged state of a secondary battery provided with a detector capable of detecting an input/output current, an output voltage and a battery temperature, comprising: a stable state determining step of determining whether said secondary battery operates in a stable state in which said input/output current is maintained not higher than a limit current set in accordance with said battery temperature for at least a voltage stabilizing period set in accordance with said battery temperature, wherein said limit current increases as said battery temperature increases; anda first charged state estimating step of estimating the remaining capacity of said secondary battery based on a characteristic relation between an open circuit voltage and a remaining capacity of said secondary battery, regarding said output voltage as the open circuit voltage of said secondary battery, when said secondary battery is determined to be operating in the stable state. 8. The method of estimating a charged state of a secondary battery according to claim 7, further comprising a second charged state estimating step of estimating the remaining capacity of said secondary battery when the secondary battery is determined not to be operating in said stable state at said stable state determining step; whereinat said second charged state estimating step, the remaining capacity of said secondary battery is estimated by a procedure of successively calculating an amount of change in said remaining capacity based on an integrated value of said input/output current or a procedure based on a battery model using said input/output current, said output voltage and said battery temperature as input variables. 9. The method of estimating a charged state of a secondary battery according to claim 8, wherein said second charged state estimating step includesa first estimating step of estimating the remaining capacity of said secondary battery by calculating the amount of change in said remaining capacity based on an integrated value of said input/output current,a second estimating step of estimating the remaining capacity of said secondary battery based on the battery model using said input/output current, said output voltage and said battery temperature as input variables, anda time measuring step of measuring duration of continuous execution of the estimation of remaining capacity by said first estimating step; andat said second charged state estimating step, said remaining capacity is estimated by selecting said first estimating step when said duration of continuous execution is within a first limit time period, and estimates said remaining capacity by selecting said second estimating step when said duration of continuous execution exceeds said first limit time period and said input/output current is in a prescribed range that allows use of the battery model. 10. The method of estimating a charged state of a secondary battery according to claim 7, wherein said voltage stabilizing period at said stable state determining step is set relatively short as said battery temperature increases. 11. The device for estimating charged state of a secondary battery according to claim 1, wherein said secondary battery is a lithium ion battery. 12. The method of estimating charged state of a secondary battery according to claim 7, wherein said secondary battery is a lithium ion battery.
Watanabe Nobuo,JPX ; Kuroda Yukio,JPX ; Kikuchi Yoshiaki,JPX, Means for estimating charged state of battery and method for estimating degraded state of battery.
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