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When purchasing a used electric vehicle (EV), the battery’s State of Health (SoH) is a critical yet complex factor. AVILOO, a leader in independent battery diagnostics, offers precise solutions to assess battery condition, providing transparency for buyers, dealers, and fleet managers.
Key Highlights
- SoH Variability: Different calculation methods and reference values impact SoH accuracy.
- Capacitive vs. Energetic SoH: Capacitive SoH may overestimate range; energetic SoH reflects usable energy.
- AVILOO’s Approach: Uses State of Certified Energy (SoCE) for precise, cell-level analysis.
- PREMIUM Test: World’s most accurate battery analysis, certified and transparent.
- FLASH Test: Fast, data-driven SoH assessment in just three minutes.
Understanding SoH: Not All Metrics Are Equal
The SoH indicates a battery’s condition relative to its original state but isn’t directly measurable. According to Patrick Schabus, Chief Product Officer at AVILOO, varying reference values and calculation methods can lead to inconsistent results. Two primary SoH types exist:
- Capacitive SoH: Measures remaining capacity in ampere-hours. It’s less affected by temperature but overlooks internal resistance, often overestimating range in older EVs.
- Energetic SoH: Measures usable energy in kilowatt-hours, directly tied to range. For example, 90% energetic SoH means 90% of the original range remains. Calculations, standardized to the WLTP cycle at 23°C, are complex due to temperature and load influences.
Calculation Methods: Pack vs. Cell Level
SoH calculations differ in precision:
- Pack-Level Analysis: Provides rough estimates, missing individual cell data.
- Cell-Level Analysis: Evaluates each cell’s state of charge, including balancing status, for greater accuracy.
- Average Cell Method: Common but less precise, as it doesn’t prioritize weaker cells.
- Weakest Cell Method: Most accurate, using the weakest cell to determine overall battery health.
AVILOO’s Solution: State of Certified Energy (SoCE)
AVILOO’s SoCE is an energetic SoH calculated at the cell level, adhering to the GTR22 standard. By focusing on the weakest cell and measuring usable energy under defined conditions, SoCE ensures a transparent, traceable representation of a vehicle’s actual range.
AVILOO PREMIUM Test: Unmatched Precision
The AVILOO PREMIUM Test is the market’s most accurate battery analysis. Conducted during a test drive, it collects real-time data on current, cell voltage, and temperature, processed via the AVILOO Cloud. Using lab-based cell models, it surpasses vehicle Battery Management Systems (BMS) in precision, delivering a certified battery certificate that reliably shows remaining range.
AVILOO FLASH Test: Speed Without Compromise
For rapid assessments, the AVILOO FLASH Test uses machine learning trained on thousands of PREMIUM tests. In just three minutes, it evaluates SoH based on factors like vehicle age and mileage, ideal for quick decisions in trading or service scenarios.
Why It Matters
Battery health assessment is intricate, and unverified SoH values can mislead. AVILOO’s certified, independent tests provide transparency and reliability, benefiting the used EV market.
About AVILOO
AVILOO leads globally in battery diagnostics for EVs and plug-in hybrids, offering TÜV and CARA-certified tests covering 96% of available brands. Their solutions, including the rapid FLASH Test, ensure precise, manufacturer-independent diagnostics.
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