EV Battery Loss Evaluation Using Charge Duration Baselines
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Solution Overview
Problem
Existing methods for evaluating battery loss in new energy vehicles are inadequate as they rely on actual mileage, which is influenced by various factors such as road conditions and user habits, making it unsuitable as a single standard for assessing battery health.
Innovation Solution
A method and system that acquire factory data to calculate theoretical and actual charge durations, determining battery loss by forming reference standards based on duration differences, allowing for quantitative evaluation of battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If actual mileage is used to evaluate battery loss, then the evaluation is simple to implement, but the measurement precision is low due to multiple influence factors
Solution Approach 1:
The patent changes the evaluation parameter from actual mileage to charge duration. By measuring the time required to charge the battery to a standard level (e.g., 80% charge state) and comparing it against factory baseline data, the system achieves accurate battery loss evaluation without being influenced by road conditions, user habits, or other external factors that affect mileage-based assessments.
2Device complexity
If actual mileage is used as the single standard for battery evaluation, then the evaluation method is simple, but the reliability is low due to multiple confounding factors
Solution Approach 1:
The patent replaces the unreliable mileage parameter with charge duration as the evaluation metric. This parameter change eliminates the influence of confounding factors such as driving conditions and user behavior, providing a reliable and consistent measure of battery health that directly reflects battery capacity degradation.
Solution Approach 2:
The system establishes a feedback mechanism by comparing actual charge duration against factory baseline data and previously recorded charge durations. This feedback loop enables continuous monitoring and accurate assessment of battery loss, allowing the system to reliably track battery health over time and provide maintenance guidance.
3Measurement precision
If charge duration is used to evaluate battery loss, then the measurement precision is improved, but the device complexity increases due to data acquisition and calculation requirements
Solution Approach 1:
The system leverages existing vehicle onboard resources (battery management system, onboard timer, and stored factory data) to perform the evaluation. By using already-available data and simple comparison calculations against baseline values, the system achieves high measurement precision without requiring complex additional hardware or sophisticated analysis algorithms.
Data Source
AI summary
Disclosed herein are a method and system for evaluating the battery loss of a new energy vehicle. The method includes: Step 1, acquiring factory data of a vehicle, the initial charge electric quantity of the vehicle and the duration for full charge of the vehicle; Step 2, according to the factory data of the vehicle, calculating a theoretical duration for full charge of the vehicle at each of the electric quantity levels; and Step 3, forming a plurality of reference standards by dividing in the unit of time, making the plurality of reference standards correspond to a plurality of battery health levels, and determining the battery loss degree according to the range of the reference standard where the duration difference mean value falls. The battery loss is evaluated quantitatively by means of the decrement of the charge duration.