Round-Trip Energy Efficiency and Energy-Efficiency Fade Estimation for Battery Passport
conference paper
The battery passport is proposed as a method to make the use and remaining value of batteries more transparent. The future EU Battery Directive requests this passport to contain the round-trip energy efficiency and its fade. In this paper, an algorithm is presented and demonstrated that estimates the round-trip energy efficiency of a battery pack. The algorithm identifies round trips based on battery current and SoC and characterizes these round trips based on certain conditions. 2D efficiency maps are created as a function of the conditions 'temperature' and 'RMS C-rate'. The maps are parameterized using multiple linear regression, which allows comparison of the efficiency under the same conditions. Analyzing data from three battery-electric buses over a period of 3.5 years reveals an efficiency fade of up to 0.86 percent point.
Topics
TNO Identifier
994796
ISBN
9798350344455
Publisher
Institute of Electrical and Electronics Engineers Inc.
Source title
2023 IEEE Vehicle Power and Propulsion Conference, VPPC 2023 - Proceedings
Files
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