A method of deriving the initial component value of the randles circuit model of a secondary battery and a method of deriving the internal resistance component of a secondary battery using the initial component value

• Main Authors: YOO SOL JI, SONG HYEON JIN
• Format: Patent
• Language: English; Korean
• Published: 25.04.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The present invention relates to a method for deriving the initial component value of a Randle circuit model of a secondary battery and a method for clarifying the effects of the internal resistance component of a secondary battery by using the initial value derived by the method thereof. In particular, provided in the present invention is a method, which derives an electrolyte resistance initial value (R1), a charge transfer resistance initial value (R2) and a capacitance initial value (C1) based on data measured by the EIS, and derives the electrolyte resistance, the charge transfer resistance and the capacitance resistance component of the secondary battery cell by using the derived initial values. Therefore, a relatively precise Nyquist pitting may be performed. 본 발명은 이차전지의 랜들 회로 모델의 성분 초기값 도출방법 및 상기 방법에 의해 도출된 초기값을 이용하여 이차전지 내부의 저항성분의 영향력을 밝히는 방법에 관한 것이다. 구체적으로 본 발명은 EIS에 의해 측정된 데이터를 기반으로 전해액 저항의 초기값(R1), 전하전달 저항의 초기값(R2) 및 커패시턴스의 초기값(C1) 등을 도출하고, 상기 도출된 초기값들을 이용하여 이차전지 셀의 전해액 저항, 전하전달 저항 및 커패시턴스 저항 성분을 도출하는 방법을 제공하는 것을 특징으로 한다.