2021-341 – Method for Statistical Design of Energy Storage Systems

Second-use battery energy storage systems (2-BESS)Repurpose automotive batteries
  • Second-use battery energy storage systems (2-BESS)
  • Repurpose automotive batteries


Repurposing automotive batteries may have environmental and economic benefits. The challenge with second-use batteries is the uncertainty and diversity of the expected packs in terms of their chemistry, capacity, and remaining useful life.

A new method for designing a second-use energy storage system (2-BESS) using a sparse hierarchical power processing architecture has been invented. It uses a new strategy to optimize 2-BESS performance despite the diversity or heterogeneity of individual batteries while reducing the cost of power conversion. The statistical distribution of the power heterogeneity in the supply of batteries is considered when optimizing the choice of power converters and designing the power flow within the battery energy storage system (BESS) to maximize battery utilization. It uses data on supply heterogeneity, testing accuracy, and aging/degradation to optimally choose power converter ratings and power connectivity within2-BESS. This results in higher battery utilization in capacity and power while using lower power converters, high heterogeneity.




High battery utilization in capacity and power

Use lower power converters

High system efficiency

Potential Applications:

Power grid

Micro and nanogrid

EV charging station

Contact Information:

Name: Joohee Kim

Email: jooheek@umich.edu

Phone: (734) 647-5730