[특허]Battery management system using a resistor and driving method thereof

Samsung SDI Co., Ltd.

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Battery management system using a resistor and driving method thereof

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02J-007/00
미국특허분류(USC)	320/132; 320/107
출원번호	US-0854865 (2007-09-13)
등록번호	US-8174240 (2012-05-08)
우선권정보	KR-10-2006-0107262 (2006-11-01)
발명자 / 주소	Yun, Han-Seok Choi, Soo-Seok Lee, Young-Jo Tae, Yong-Jun Seo, Se-Wook Lim, Gye-Jong Kim, Beom-Gyu Park, Ho-Young
출원인 / 주소	Samsung SDI Co., Ltd.
대리인 / 주소	Christie, Parker & Hale, LLP
인용정보	피인용 횟수 : 2 인용 특허 : 3

초록

A battery management system and a driving method include a first switch coupled to an end of a resistor. When calculating an internal resistance of a battery, the first switch is turned on and the battery and the resistor are coupled in parallel. Then, the internal resistance of the battery is calculated by using a second current flowing to the battery and a first current flowing to the resistor.

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1. A battery management system comprising: a resistor configured to be coupled in series between a battery and a first power source, andbetween an external source and the first power source; anda first switch coupled between one end of the resistor and the first power source,wherein the battery management system is configured to calculate an internal resistance of the battery while charging the battery from the external source and while discharging the battery to the external source by: turning on the first switch to couple the resistor in series between the battery and the first power source when discharging the battery to the external source, andbetween the external source and the first power source when charging the battery from the external source; andcalculating the internal resistance of the battery by using a value of a first current flowing to the resistor and a value of a second current flowing to/from the battery. 2. The battery management system of claim 1, wherein the battery management system is further configured to calculate the internal resistance of the battery by using the following equation: Rb=Rf×IfIc-If, where Ic denotes a charging and discharging current of the external source, If denotes the first current value, (Ic−If) denotes the second current value, Rf denotes a resistance of the resistor, and Rb denotes the internal resistance of the battery. 3. The battery management system of claim 2, further comprising: a second switch coupled between the battery and an inverter in series, the second switch for transmitting the charging and discharging current between the battery and the external source; anda third switch coupled to the second switch in parallel, the third switch for turning on when the battery is initially discharged or initially charged to prevent an initial in-rush current from flowing between the battery and the external source. 4. The battery management system of claim 3, wherein the resistor is a precharge resistor used to control a voltage between the battery and the inverter when the battery is initially charged or initially discharged. 5. The battery management system of claim 2, wherein the resistor is a precharge resistor used to control a voltage between the battery and an inverter when the battery is initially charged or initially discharged. 6. The battery management system of claim 1, wherein the resistor is a precharge resistor used to control a voltage between the battery and an inverter when the battery is initially charged or initially discharged. 7. The battery management system of claim 1, wherein the battery is for use in an electric or hybrid vehicle. 8. A battery management system to manage a battery, the battery management system comprising: a resistor configured to be coupled in series between the battery and a first power source; andbetween an external source and the first power source;a first current sensor to measure a first current flowing to the resistor;a first switch having a first end coupled to the resistor and a second end coupled to the first power source having a first voltage; anda main control unit (MCU) to: turn on the first switch to couple the resistor in series between the battery and the first power source when discharging the battery to the external source, andbetween the external source and the first power source when charging the battery from the external source; andcalculate an internal resistance of the battery while charging the battery from the external source and while discharging the battery to the external source by using a value of a second current flowing to/from the battery and a value of the first current flowing to the resistor. 9. The battery management system of claim 8, further comprising: a second current sensor to measure a charging and discharging current of the external source;a second switch coupled between the battery and an inverter in series, the second switch having a first end coupled to the first current sensor and a second end coupled to the second current sensor, the second switch for transmitting the charging and discharging current between the battery and the external source to charge and discharge the battery; anda third switch coupled to the second end of the second switch in parallel and coupled to a first end of the resistor, the third switch for turning on when the battery is initially discharged or initially charged to prevent an initial in-rush current from flowing between the battery and the external source. 10. The battery management system of claim 9, wherein the resistor is a precharge resistor used to control a voltage between the battery and the inverter. 11. The battery management system of claim 8, wherein the resistor is a precharge resistor used to control a voltage between the battery and an inverter. 12. The battery management system of claim 8, wherein the battery is for use in an electric or hybrid vehicle. 13. A driving method to drive a battery management system that manages a battery, the driving method comprising: selectively coupling a resistor in series between the battery and a first power source, andbetween an external source and the first power source by using a first switch coupled between one end of the resistor and the first power source;measuring a second current flowing to/from the battery while charging the battery from the external source and while discharging the battery to the external source;measuring a first current flowing to the resistor while charging the battery from the external source when the resistor is selectively coupled in series between the external source and the first power source, andwhile discharging the battery to the external source when the resistor is selectively coupled in series between the battery and the first power source; andcalculating an internal resistance of the battery by using a value of the first current and a value of the second current. 14. The driving method of claim 13, wherein the selectively coupling of the resistor comprises selectively coupling the one end of the resistor with the first power source having a first voltage during the measuring of the first current. 15. The driving method of claim 14, wherein the first voltage is a ground voltage. 16. The driving method of claim 14, wherein the calculating of the internal resistance comprises calculating the internal resistance of the battery by using the following equation: Rb=Rf×IfIc-If, where Ic denotes a charging and discharging current of the external source, If denotes the first current value, (Ic−If) denotes the second current value, Rf denotes a resistance of the resistor, and Rb denotes the internal resistance of the battery. 17. The driving method of claim 16, wherein the resistor is a precharge resistor used to control a voltage between the battery and an inverter. 18. A battery management system to manage a battery, comprising: a resistor configured to be selectively coupled in series between the battery and a first power source, andbetween an external source and the first power source; a switch coupled between one end of the resistor and the first power source; anda main control unit for measuring an internal resistance of the battery by selectively coupling the resistor in series between the battery and the first power source when discharging the battery to the external source, andbetween the external source and the first power source when charging the battery from the external source, by selectively turning on the switch. 19. The battery management system of claim 18, wherein the main control unit is configured to measure the internal resistance of the battery by using the following equation: Rb=Rf×IfIc-If, where Ic denotes a charging and discharging current of the external source, If denotes a value of a first current flowing to the resistor, (Ic−If) denotes a value of a second current flowing to/from the battery, Rf denotes a resistance of the resistor, and Rb denotes the internal resistance of the battery. 20. A driving method to drive a battery management system that manages a battery, the driving method comprising: selectively coupling a resistor in series between the battery and a first power source, andbetween an external source and the first power source, by using a switch coupled between one end of the resistor and the first power source; andcalculating an internal resistance of the battery,wherein when measuring the internal resistance of the battery, the resistor is selectively coupled in series between the battery and a first power source when discharging the battery to the external source, andbetween the external source and the first power source when charging the battery from the external source, by selectively turning on the switch. 21. The driving method of claim 20, wherein the calculating of the internal resistance of the battery comprises using the equation: Rb=Rf×IfIc-If, where Ic denotes a charging and discharging current of the external source, If denotes a value of a first current flowing to the resistor, (Ic−If) denotes a value of a second current flowing to/from the battery, Rf denotes a resistance of the resistor, and Rb denotes the internal resistance of the battery.

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