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About Stropower
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Solution
Battery Aging Analysis and Pre-failure Warning Test
Battery Aging Mechanism Analysis and Pre-failure Warning Application of Ripple Technologies
Background for the demand of battery aging mechanism analysis and pre-warning
2020~2023: Continuous growth of battery production & sales volume (traction power batteries for xEVs | energy storage) But: Overall growth rate is decreasing year by year (falling off a cliff in 2023).
With rapid rising of EVs, the spontaneous combustion accidents caused by lithium-ion battery failure has also increased sharply; More than 4,000 spontaneous combustion accidents of xEV in 2023 (about 0.3‰ of held qty.), 50% are related to batteries.
Electro-chemical Mechanism for Lithium-ion Battery's Aging and Degradation - The Contribution of AC Ripples
Lithium battery failure inducements： High/Low temperature environment, voltage, over-charge ,over-discharge etc. A new question rarely talked about: What is aging impact of AC ripple?
The drivetrain battery is not exposed to direct current only, the AC component (ripple) can reach up to 20%~30% of the DC power.
Some secondary causes of AC ripple effects on battery aging mechanism . . .
Test & Measurement with Stropower Solution to Detect the Mechanism and Model
Aging mechanism analysis of characteristic high-frequency ripple on batteries，Specific high-frequency ripple fk long-cycle injection has relatively little effect on battery capacity.
AC harmonics self-heating durability – Aging mechanism analysis: Conductive loss & active material loss as the leading internal resistance degradation
Based on the basic DC charge/discharge test, we introduced the In-situ AC impedance analyzer, which covers the DC and AC test demand, and can meet the dual research needs of in-situ AC impedance and battery ripple-based service life.
Through EV’s characteristic AC fw coupling – excitation – acquisition – communication – modeling, to achieve critical failure and thermal runaway monitoring and time-domain early warning.
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