Electric car charging
Product Update

Improving the Accuracy of Battery Models Using the Open-Circuit-Voltage (OCV) Curve

April 8, 2024

The OCV is a key element in electric models of lithium-ion batteries and describes the thermodynamic voltage at equilibrium. In this article, we describe how considering OCV aging is vital when designing and manufacturing electric cars.

Electric car charging
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Dr. Markus Mühlbauer
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Improving the Accuracy of Battery Models Using the Open-Circuit-Voltage (OCV) Curve

The OCV is a key element in electric models of lithium-ion batteries and describes the thermodynamic voltage at equilibrium. It refers to the voltage of the battery when it is not connected to a load or a charging device.

Unfortunately, the change of this OCV curve over aging is often neglected in battery modeling, resulting in challenges regarding accuracy of battery models over battery lifetime.

In this article, we describe how considering OCV aging is vital when designing and manufacturing electric cars:

  • How the OCV curve can be used for estimating State of Charge
  • How the OCV curve can help manufacturers ensure the correct battery size
  • Integrating OCV aging into battery modeling

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About the Authors

Dr. Markus Mühlbauer

Markus is a seasoned expert in battery analytics and simulation, with a decade of experience in the BESS and automotive industries. As Lead Battery Modeling Engineer at TWAICE, he bridges market needs with data-driven solutions that mitigate risks and optimize the battery life cycle. Holding a patent and a doctorate in electrical engineering, he combines deep technical expertise with strategic insight to shape the future of energy storage.

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