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Open AccessFeature PaperArticle

Incremental Capacity Curve Peak Points-Based Regression Analysis for the State-of-Health Prediction of a Retired LiNiCoAlO2 Series/Parallel Configured Battery Pack

1
Power Electronics and Energy Conversion Laboratory, Department of Electrical Engineering, Soongsil University, Seoul 06978, Korea
2
Energy Storage and Conversion Laboratory, Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1118; https://doi.org/10.3390/electronics8101118
Received: 31 August 2019 / Revised: 23 September 2019 / Accepted: 27 September 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Challenges of Battery Management System)
To recycle retired series/parallel battery packs, it is necessary to know their state-of-health (SOH) correctly. Unfortunately, voltage imbalances between the cells occur repeatedly during discharging/charging. The voltage ranges for the discharge/charge of a retired series/parallel battery pack are reduced owing to the voltage imbalances between the cells. To determine the accurate SOH of a retired series/parallel battery pack, it is necessary to calculate the total discharge capacity using fully discharging/charging tests. However, a fully discharging/charging test is impossible owing to the reduced voltage range. The SOH of a retired series/parallel battery pack with a voltage imbalance should be estimated within the reduced discharging/charging voltage range. This paper presents a regression analysis of the peak point in the incremental capacity (IC) curve from the fresh state to a 100-cycle aging state. Moreover, the SOH of the considered retired series/parallel battery pack was estimated using a regression analysis model. The error in the SOHs of the retired series/parallel battery pack and linear regression analysis model was within 1%, and hence a good accuracy is achieved.
Keywords: retired series/parallel battery pack; recycling; voltage imbalance; state-of-health; incremental capacity curve; regression analysis retired series/parallel battery pack; recycling; voltage imbalance; state-of-health; incremental capacity curve; regression analysis
MDPI and ACS Style

Lee, H.; Park, J.; Kim, J. Incremental Capacity Curve Peak Points-Based Regression Analysis for the State-of-Health Prediction of a Retired LiNiCoAlO2 Series/Parallel Configured Battery Pack. Electronics 2019, 8, 1118.

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