How to calculate the state of heath of lithium battery, is there an equation ?
Hello Fatima
You better go TO the attached link to get understanding of state of health (SOH) and state of charge(SOC) of a battery.
https://www.biologic.net/topics/battery-states-state-of-charge-soc-state-of-health-soh/.
State of Health (SOH) is actually the comparison of the remaining capacity of the cell after cycled to its capacity after formation. Usually, Li-ion battery for EV application needs to have SOH > 80% before replacement needed.
Dear Fatima Zohra Hamani ,
In fact, there are many ways to identify the SOH of batteries or any industrial system depending on what data you have and the way it behaves. Also, it may depend on how well you understand the degradation phenomenon as an expert. So, in this case, I have two answers to your question. First, you can read our RUL systematic guide [1]. There is an interesting flowchart you can follow to do this. Secondly, you can for example consult this article [2] (see [2], equation 23).
I hope this is helpful!!. Good luck !!
[1] T. Berghout and M. Benbouzid, “A Systematic Guide for Predicting Remaining Useful Life with Machine Learning,” Electronics, vol. 11, no. 7, p. 1125, Apr. 2022, doi: 10.3390/electronics11071125.
[2] L. Cai, J. Lin, and X. Liao, “An estimation model for state of health of lithium-ion batteries using energy-based features,” J. Energy Storage, vol. 46, no. December 2021, p. 103846, Feb. 2022, doi: 10.1016/j.est.2021.103846.
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