Dr. Wei Gao of San Diego State University

With the increasing penetration of electric vehicles (EVs), millions of battery packs are going to be retired every year in the near future. Although the batteries are no longer suitable for vehicle use, they are still qualified for energy storage applications. Then we are interested to know a couple of questions:

• What is the health condition of the retired battery packs bought from the market?
• The major difference between retired LiMO2/ LiNMC battery packs and LiFePO4 battery packs.
• How many years (aging cycles) can the retired batteries be used in battery energy storage systems (BESS)? And the investment return analysis.
• The challenge to design battery management systems (BMS) for the second-life batteries compared to new batteries.

In this presentation, the speaker is going to introduce the study of four different types of retired EV batteries, i.e., Nissan Leaf Gen1 24kWh, Nissan Leaf Gen2 62 kWh battery packs, BYD electric bus LiFePO4 batteries, and CALB LiFePO4 batteries used for electric forklifts. And the questions listed above will be answered.

Biography:

Wei Gao – Post Doc. of San Diego State University/ Department of Electric and Computer Engineering

Wei Gao has years of experience in designing BMS for electric vehicles. He has achievements in the technologies to track and identify battery health conditions based on the battery operation data. Wei Gao received the Ph.D degree from Beijing Institute of Technology, Beijing, China, and now working in San Diego State University, focusing on researches in designing BESS using second-life EV batteries.