open circuit voltage

The Role of Cut-Off Voltage and Anode Material in Li-Ion Cells

Cut off voltage versus SOC graph

AION Engineering INC In lithium-ion battery technology, optimizing cell performance and safety requires careful consideration of multiple parameters. Among these, the cut-off voltage is critical for balancing energy density and ensuring cell longevity and stability. While cathode chemistry often guides cell classification, variations in anode materials significantly impact the appropriate cut-off voltage setting. Influence of … Read more

Battery Power Demand Solution

pack solution for a given power demand

Knowing the power demand for a battery cell or pack is really useful, but how do you turn that into a current demand? The following image shows the solution we use in the Battery Calculations Workbook and in the Vehicle Model. At first it can look daunting, but it is quite simple, maybe too simple … Read more

Parameterisation of OCV and Diffusion Coefficient

OCV and diffusion poster

Authors: Marcus Tuchel, Prof. Emma Kendrick School of Metallurgy and Materials, University of Birmingham, Elms Rd, Birmingham B15 2SE Abstract Methodology Extrapolated OCV Li ion diffusion coefficient Conclusions and Future Work References Research Bio Marcus Tuchel is a PhD student in the Birmingham Energy Materials Group, under the supervision of Prof. Emma Kendrick and Prof. … Read more

Measurement of Open Circuit Voltage

open circuit voltage versus SoC for different chemistry

The measurement of Open Circuit Voltage can be time consuming as it needs to be established versus the State of Charge (SoC) of the cell. Doing this in fine steps from 0% to 100%, with the measurement being made “at rest”, means we have to charge/discharge and then let it rest before making the voltage measurement. The … Read more

Sources of Error with the Coulomb Counting Method

SoC definition for Samsung SDI 94Ah cell

It is really important to understand the sources of error with the coulomb counting method as this forms the backbone for most SOC estimation algorithms. SoC Estimation by Coulomb Counting is based on the measurement of the current and integration of that current over time. There are five main sources of error with the coulomb … Read more