[논문]고압 배터리 팩의 임피던스 스펙트럼 측정용 휴대용 임피던스 분광기

굴 라힘; 최우진

doi:10.6113/tkpe.2021.26.3.192

고압 배터리 팩의 임피던스 스펙트럼 측정용 휴대용 임피던스 분광기
A Portable Impedance Spectroscopy Instrument for the Measurement of the Impedance Spectrum of High Voltage Battery Pack 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.26 no.3, 2021년, pp.192 - 198

굴 라힘 (Dept. of Electrical Engineering, Soongsil University) , 최우진 (Dept. of Electrical Engineering, Soongsil University)

Abstract ▼ AI-Helper

The battery's State of Health (SOH) is a critical parameter in the process of battery use, as it represents the Remaining Useful Life (RUL) of the battery. Electrochemical Impedance Spectroscopy (EIS) is a widely used technique in observing the state of the battery. The measured impedance at certain frequencies can be used to evaluate the state of the battery, as it is intimately tied to the underlying chemical reactions. In this work, a low-cost portable EIS instrument is developed on the basis of the ARM Cortex-M4 Microcontroller Unit (MCU) for measuring the impedance spectrum of Li-ion battery packs. The MCU uses a built-in DAC module to generate the sinusoidal sweep perturbation signal. Moreover, it performs the dual-channel acquisition of voltage and current signals, calculates impedance using a Digital Lock-in Amplifier (DLA), and transmits the result to a PC. By using LabVIEW, an interface was developed with the real-time display of the EIS information. The developed instrument was suitable for measuring the impedance spectrum of the battery pack up to 1000 V. The measurement frequency range of the instrument was from 1 hz to 1 Khz. Then, to prove the performance of the developed system, the impedance of a Samsung SM3 battery pack and a Bexel pouch module were measured and compared with those obtained by the commercial instrument.

주제어

표/그림 (14)

그림 Fig. 1. Circulation of Li-ion batteries.
그림 Fig. 2. (a) An ECM of LIB and (b) its nyquist plot.
그림 Fig. 3. Block diagram of the developed EIS system.
그림 Fig. 4. High precision current sink.
그림 Fig. 5. Four-wire Kelvin connection.
그림 Fig. 6. The front panel of the developed GUI.
그림 Fig. 7. Main program flowchart of developed system.
그림 Fig. 8. Block diagram of the DLA to calculate impedance.
그림 Fig. 9. Experimental setup.
그림 Fig. 10. Comparison of Nyquist impedance plot of Samsung SM3 Z.E battery pack measured by the developed system and commercial instrument.
그림 Fig. 11. Comparison of Nyquist impedance plot of Bexel pouch battery module measured by the developed system and commercial instrument.
표 TABLE Ⅰ BATTERY SPECIFICATIONS
그림 Fig. 13. Comparison of parameters of the ECM obtained by the developed and commercial instruments. (a) L_s, (b) R_s, (c) R_ct, (d) Q (e) n, (f) Z_W,
그림 Fig. 12. Comparison of Nyquist impedance plot of Samsung SM3 Z.E battery pack measured by the developed system and commercial instrument at different SOC's.

참고문헌 (13)

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상세보기
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원문보기 상세보기
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상세보기
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원문보기 상세보기
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