This study presents a standalone diagnostic device for HEV high-voltage battery packs that communicates directly with the BMS outside the vehicle and enables quantitative verification of BMS SOC and SOH outputs. The prototype, developed for a Renault CMA HEV pack, activates the BMS via the low-voltage harness, reads key variables such as SOC, SOH, cell voltage and temperature, and pack voltage and current over CAN, and safely controls the pack’s high-voltage relay. Using a pack reported as 100% SOH by the BMS, constantcurrent discharge at about a 0.1 C-rate was performed in the SOC range from 30% to 45%, and for 5, 10 and 15-minute segments the usable energy estimated from the BMS SOC and the rated capacity showed mean values around 1.54kWh with a coefficient of variation of approximately 2-3%. The proposed BMS-linked evaluation equipment estimates the usable capacity within a tolerance consistent with the manufacturer’s nominal specification and can serve as a practical basis and tool for second-life evaluation of used high voltage battery packs.

Abstract
1. 서 론
2. 진단장비 구성 및 제작
    2.1 고전압 배터리팩 분석 및 진단 요구 사항
    2.2 시스템 전체 구성
    2.3 BMS 통신과 릴레이 제어 및 절연설계
3. 기능구현 및 검증 평가
    3.1 시험 평가 구성 및 데이터 취득
    3.2 SOC 기반 용량 추정과 실제 방전 용량 비교
    3.3 유효 용량 반복 측정 결과 및 Gage R&R관점 고찰
4. 결론 및 향후 과제
후 기
References

• 김홍석(Professor, Dept. of Automotive Engineering, Inha Technical College) | HongSeok Kim Corresponding author
• 고홍기(Renault Korea ePowertrain Development Team) | HongGi Ko
• 한상근(DAONHC Co., Ltd.) | SangGeun Han