Class
Article
College
College of Engineering
Department
Electrical and Computer Engineering Department
Faculty Mentor
Regan Zane
Presentation Type
Poster Presentation
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. The work 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%.Presentation Time: Thursday, 9-10 a.m.Zoom link: https://usu-edu.zoom.us/j/86532446768?pwd=M0prUXFFWUJPeTVPSS9BWEVsSWxFdz09
Location
Logan, UT
Start Date
4-12-2021 12:00 AM
Included in
Investigation of Active Life Balancing to Recondition Li-ion Battery Packs for 2nd Life
Logan, UT
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. The work 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%.Presentation Time: Thursday, 9-10 a.m.Zoom link: https://usu-edu.zoom.us/j/86532446768?pwd=M0prUXFFWUJPeTVPSS9BWEVsSWxFdz09