EV Battery Voltage-Based Range Estimation Without Full Cycling
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Solution Overview
Problem
Existing methods for determining the maximum real range of electric vehicles are inaccurate and require specialized technicians, are model-specific, and involve complete charging and discharging cycles that can shorten battery life.
Innovation Solution
A method for determining the maximum real range of an electric vehicle by measuring battery terminal voltages at initial and final states within a partial charging or discharging cycle, using a predetermined demand based on standardized consumption profiles, without full charging or discharging, to estimate the state of health and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete charging and discharging cycles are performed to accurately determine battery state of health, then measurement precision is improved, but battery life is shortened due to increased aging
Solution Approach 1:
The patent applies partial action by performing only a partial discharge (from initial state of charge to a final state of charge within the cycling domain) rather than a complete discharge cycle. This partial discharge is sufficient to measure voltage variation and calculate state of health, while avoiding the harmful effects of full cycling that accelerates battery aging.
Solution Approach 2:
The patent performs preliminary action by conducting the partial discharge measurement before significant aging occurs. The method enables frequent SOH assessments during the battery's operational life without subjecting it to stressful complete cycles, allowing early detection of degradation trends while preserving battery lifespan.
2Reliability
If frequent battery assessments are performed to track range degradation, then reliability of range information is improved, but battery aging is accelerated due to repeated cycling
Solution Approach 1:
The patent uses partial discharge cycles instead of complete cycles for frequent assessments. The partial discharge from initial to final state of charge within the cycling domain provides sufficient voltage variation data for accurate SOH calculation while minimizing the stress imposed on the battery, enabling frequent monitoring without significant aging.
Solution Approach 2:
The patent changes the parameter of discharge depth by operating within a restricted cycling domain (between initial and final states of charge) rather than performing full 0-100% discharge cycles. This parameter modification allows frequent measurements while reducing the cumulative aging effect.
3Adaptability or versatility
If standardized measurement protocols are implemented across different vehicle models, then adaptability is improved, but device complexity increases due to need for multiple calibration profiles
Solution Approach 1:
The patent implements universality by creating a standardized measurement protocol that can be applied across different electric vehicle models and battery types. The method uses universal parameters (voltage at initial and final states of charge, capacity values from manufacturer specifications) that can be obtained for any battery system, enabling cross-model compatibility without requiring model-specific hardware modifications.
Solution Approach 2:
The patent uses copying by obtaining capacity values from manufacturer specifications rather than performing complete discharge tests for each battery. This allows the standardized protocol to work across different models by using published reference data, reducing the need for extensive calibration while maintaining measurement accuracy.
Data Source
AI summary
A method for determination of a maximum real range of an electric vehicle equipped with a battery having a variable charging state within a cycling domain. The method includes getting a first and second magnitude indicative of an electric voltage at the terminals of the battery, respectively for an initial value and for a final value of the state of charge within the cycling domain. The method further includes a predetermined demand on the battery during which the charging state of the battery varies within the cycling domain from the initial value to a final value. The method further includes determining the maximum real range of the vehicle based on an estimate of a difference between the second magnitude and the first magnitude.