BATTERY MANAGEMENT SYSTEM, BATTERY PACK INCLUDING SAME, AND METHOD OF ESTABLISHING CHARGING PROTOCOL OF LITHIUM SECONDARY BATTERY
By a method of establishing a charging protocol of a lithium secondary battery and a battery management system according to the present invention, a closed circuit voltage (CCVSOCx) and an open circuit voltage (OCVSOCx), which change according to a depth of charge (SOCx), are measured while charging...
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Sprache: | eng ; fre ; kor |
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Zusammenfassung: | By a method of establishing a charging protocol of a lithium secondary battery and a battery management system according to the present invention, a closed circuit voltage (CCVSOCx) and an open circuit voltage (OCVSOCx), which change according to a depth of charge (SOCx), are measured while charging a 2-electrode battery cell at each charge current (I), the measured CCVSOCx and OCVSOCx are substituted in Equation 1 below to calculate an internal resistance value (RSOCx), which changes according to the depth of charge, and an internal resistance profile obtained by plotting the internal resistance value (RSOCx), which changes according to the depth of charge, is collected for each charge current (I) to determine a limit depth of charge corresponding to each charge current from the internal resistance profile. [Equation 1] Internal resistance value changing according to depth of charge (RSOCx)=(CCVSOCx - OCVSOCx)/I
Par un procédé d'établissement d'un protocole de charge d'une batterie secondaire au lithium et d'un système de gestion de batterie selon la présente invention, une tension de circuit fermé (CCVSOCx) et une tension de circuit ouvert (OCVSOCx), qui changent en fonction d'une profondeur de charge (SOCx), sont mesurées tout en chargeant une cellule de batterie à 2 électrodes à chaque courant de charge (I), les CCVSOCx et OCVSOCx mesurés sont substitués dans l'équation 1 ci-dessous pour calculer une valeur de résistance interne (RSOCx), qui change en fonction de la profondeur de charge, et un profil de résistance interne obtenu en traçant la valeur de résistance interne (RSOCx), qui change en fonction de la profondeur de charge, est collecté pour chaque courant de charge (I) afin de déterminer une profondeur limite de charge correspondant à chaque courant de charge à partir du profil de résistance interne. [Équation 1] La valeur de résistance interne changeant en fonction de la profondeur de charge (RSOCx)=(CCVSOCx - OCVSOCx)/I
본 발명에 따른 리튬 이차전지의 충전 프로토콜 수립방법 및 배터리 관리 시스템은, 2 전극 배터리 셀에 대하여, 각 충전 전류(I)로 충전 시의 충전 심도(SOCx)에 따른 폐쇄 회로 전압(CCVSOCx) 및 개방 회로 전압(OCVSOCx)을 측정하고, 하기 식 1에, 상기 측정된 CCVSOCx 와 OCVSOCx를 대입하여 충전 심도에 따른 내부 저항값(RSOCx)을 산출하며, 각 충전 전류(I) 별로, 충전 심도에 따른 내부 저항값(RSOCx)을 플롯팅(plotting)한 내부 저항 프로파일을 수집하여, 내부 저항 프로파일로부터, 각 충전 전류에 대응하는 한계 충전 심도를 결정하는 것을 특징으로 한다. [식 1] 충전 심도에 따른 내부 저항값(RSOCx)=(CCVSOCx - OCVSOCx)/I |
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