# Impedance Estimation for Lithium Secondary Battery According to 1D Thermal Modeling

• 이정수 (한국기술교육대학교 대학원 메카트로닉스공학과) ;
• 임근욱 (한국기술교육대학교 대학원 전기전자공학과) ;
• 김광선 (한국기술교육대학교 대학원 메카트로닉스공학과) ;
• 조현찬 (한국기술교육대학교 대학원 전기전자공학과) ;
• 유상길 (넥스콘테크놀로지(주))
• Lee, Jung-Su (Dept of Mechatronics Eng, Graduate School, Korea University of Technology and Education) ;
• Lim, Geun-Wook (Dept of Electrical and Electronics Eng, Graduate School, Korea University of Technology and Education) ;
• Kim, Kwang-Sun (Dept of Mechatronics Eng, Graduate School, Korea University of Technology and Education) ;
• Cho, Hyun-Chan (Dept of Electrical and Electronics Eng, Graduate School, Korea University of Technology and Education) ;
• Yoo, Sang-Gil (NEXCON TECHNOLOGY Co., LTd.)
• 발행 : 2008.06.30

#### 초록

In this paper, in order to get the characteristics of the lithium secondary cell, such as charge and discharge characteristic, temperature characteristic, self-discharge characteristic and the capacity recovery rate etc, we build a thermal model that estimate the impedance of battery by experiment & simulation. In this one-dimensional model, Seven governing equations are made to solve seven variables c, $c_s,\;\Phi_1,\;\Phi_2,\;i_2$, j and T. The thermal model parameters used in this model have been adjusted according to the experimental data measured in the laboratory. The result(Voc, Impedance) of this research can be used in BMS(Battery Management System), so an efficient method of using battery is developed.