본 발명에 따른 리튬 이차전지의 충전 프로토콜 수립방법은, 2 전극 배터리 셀에 대하여, 참조 전류로 충전했을 때, 충전 심도(SOCx)에 따른 개방 회로 전압(Vref)을 측정하는 과정; 상기 배터리 셀에 대하여, 충전 전류를 달리하여 충전했을 때, 각 충전 전류로 충전 시의 충전 심도(SOCx)에 따른 개방 회로 전압(Vc)을 측정하는 과정; 하기 식 1에, 상기 측정값 Vref, Vc를 대입하여, 각 충전 전류 별로, 충전 심도(SOCx)에 따른 내부 저항값(RSOCx)을 산출하고, 각 충전 전류 별로, 충전 심도(SOCx)에 따른 내부 저항 값을 플롯팅(plotting)한 내부 저항 프로파일을 수집하는 과정; 및 상기 수집한 충전 전류 별 내부 저항 프로파일에서, 내부 저항값(RSOCx)이 증가하는 추세에서 감소하는 추세로 바뀌는 각각의 변곡점을 확인하고, 충전 전류 별 변곡점들 중 가장 낮은 저항값을 기준 저항값으로 결정한 후, 충전 전류 별 내부 저항 프로파일에서, 기준 저항값을 가지는 충전 심도를 한계 충전 심도로써 결정하는 과정을 포함한다. 식 1] 내부 저항값(RSOCx)= (Vc - Vref)/ Ic (상기 식 1에서, Ic는 각 충전 전류별로 인가된 전류값을 의미한다)

    A method for establishing a charging protocol for a lithium secondary battery according to the present invention, including: measuring the open-circuit voltage (Vref) according to the state of charge (SOCx) for a two-electrode battery cell with a positive and negative electrode, when charged with a reference current; measuring the open circuit voltage (Vc) according to the state of charge (SOCx) during charging with each charging current, when the battery cell is charged with different charging currents; substituting the measurements Vref, Vc into Equation 1 below, calculating an internal resistance value (RSOCx) according to the state of charge (SOCx) for each charging current, and collecting an internal resistance profile plotting the internal resistance value according to the state of charge (SOCx) for each charging current; and identifying, from the collected charging current-specific internal resistance profile, each inflection point at which the internal resistance value (RSOCx) changes from an increasing trend to a decreasing trend, determining the lowest resistance value among the inflection points for each charging current as a reference resistance value, and determining, from the internal resistance profile for each charging current, the state of charge having the reference resistance value as a limit state of charge. InternalresistancevalueRSOCx=Vc−Vref/Ic (In the above Equation 1, Ic means the applied current value for each charging current)


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    Title :

    Lithium secondary battery charging protocol establishment method battery management system battery pack and battery cell charging device


    Additional title:

    리튬 이차전지의 충전 프로토콜 수립방법, 배터리 관리 시스템, 배터리 팩 및 배터리 셀의 충전장치


    Publication date :

    2024-06-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY




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