Electrochemical Impedance Spectroscopy Based Power-mix Control Strategy for Improved Second-life Battery Performance
Year: 2020
Type: dissertation
Abstract: Providing degraded Electric Vehicle (EV) batteries with a second-life when they no longer meet vehicle energy and power requirements has the potential to increase the value of the battery and reduce the total cost of ownership for the EV owner. This thesis focuses on increasing the value that can be extracted from second-life lithium-ion EV batteries used in off-grid stationary-storage applications. Battery modeling is performed using impedance data measured using Electrochemical Impedance Spectroscopy (EIS), and a method to perform EIS measurements online is demonstrated. A control strategy is presented to control the power flow between battery modules at different States-ofHealth (SOH) in an off-grid application in order to reduce the total battery degradation rate. Simulations of the off-grid system show that, on average, the proposed strategy results in a 56% increase in battery system lifetime. Operation of the control strategy is demonstrated experimentally using two custom 3.85kWh battery modules.
Source: TSpace (University of Toronto)
Author: Carl Lamoureux
Language: English
Subfield: Automotive Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3071939703