Process / pipelineBattery Management
State of Health
State of Health (SOH) quantifies battery degradation by measuring how much capacity and power capability have been lost due to aging. SOH is expressed as a percentage (100% = new, 80% = end of life for many applications). Tracking SOH enables predictive maintenance, end-of-life detection, and accurate range/power predictions in aging systems. SOH reflects cumulative effects of cycling, calendar aging, and operating conditions.
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Sources
- Birkl, C. R., Roberts, M. R., McTurk, E., Bruce, P. G., & Howey, D. A. (2017). Degradation diagnostics for lithium ion cells. Journal of Power Sources, 341, 373-386. DOI: 10.1016/j.jpowsour.2016.12.011 ↗
- Xiong, R., Sun, F., He, H., & Gong, X. (2018). Online estimation of widespread existence of unmodeled dynamics in lithium-ion battery for electric vehicles. Energies, 11(8), 1943. DOI: 10.3390/en11081943 ↗