Model for characterizing lithium-ion battery overpotentials

This technology is a four-parameter model that can characterize overpotentials, which lead to a loss of energy as heat, in lithium-ion batteries.

Unmet Need: Accurate model for battery overpotential characterization

Battery overpotentials can result in energy being lost as heat, causing inefficiency. Current resistor-capacitor pair battery models are not highly accurate and cannot model diffusion dynamics. Accurate models for characterizing battery overpotentials would allow for measuring the maximum output capabilities of cell, resulting in improved battery monitoring and management.

The Technology: Lithium-ion battery model to characterize overpotentials

This technology is a lithium-ion battery model for ohmic, charge transfer, and diffusion overpotentials. The model is composed of four parameters using battery voltage, current, and an optimization algorithm. Diffusion dynamics are derived from a receding-horizon diffusion model (RHD) using discrete-time state-space approximations. The model can help monitor cell internal parameters and determine maximum power output capabilities of a cell.

Applications:

  • Battery monitoring
  • Battery management
  • Testing new battery models

Advantages:

  • Greater accuracy in characterizing overpotentials
  • Decreased time and complexity in characterizing overpotentials
  • Improved interpretability of maximum power estimation

Lead Inventor:

Matthias Preindl, Ph.D.

Patent Information:

Patent Pending

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