Investigation of Active Life Balancing to Recondition Li-ion Battery Packs for 2nd Life

Marium Rasheed, Mohamed Kamel, Hongjie Wang, Regan Zane, Kandler Smith

Research output: Contribution to conferencePaper

14 Scopus Citations

Abstract

An investigation is presented into the application of active life balancing battery management systems to recondition inhomogeneous Li-ion battery packs and achieve homogeneity in capacity for second life. This paper proposes a life balancing objective map, which controls the state of charge references for each cell in a battery pack based on its capacity relative to other cells. The impacts of life balancing objective maps on the reconditioning time and overall pack capacity fade are considered. Moreover, the proposed approach accounts for various load and environmental effects, including depth-of-discharge, battery pack temperature, number of cycles per day, and cells’ resting time at various states of charge. The study results in a battery pack with convergent capacities achieved in minimal time, while curtailing overall capacity fade. Simulation results for a battery pack with sixteen series connected 75 Ah Kokam NMC cells with 3.6% initial capacity imbalance are presented, indicating a reconditioning time of 1.34 months with a final capacity imbalance of 0.1% and an overall capacity fade of 0.005%.
Original languageAmerican English
Number of pages7
DOIs
StatePublished - 2020
Event2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) - Aalborg, Denmark
Duration: 9 Nov 202012 Nov 2020

Conference

Conference2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)
CityAalborg, Denmark
Period9/11/2012/11/20

NREL Publication Number

  • NREL/CP-5700-77800

Keywords

  • active balancing
  • cell balancing
  • electrochemical model
  • lifetime
  • lithium ion battery
  • second use

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