Battery Aging Estimation Using Equivalent Aging Time
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Solution Overview
Problem
Existing battery aging estimation models are limited to fixed aging patterns and fail to accurately account for changing ambient conditions, state of charge, and charging/discharging rates, leading to inaccuracies in estimating battery degradation.
Innovation Solution
A system and method that adjusts aging models to accommodate changing aging patterns by using an equivalent previous aging time to factor in previous degradation, allowing for accurate estimation of battery degradation over combined durations of different aging patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed aging patterns are used in battery aging models, then the model structure is simple and easy to implement, but the accuracy of battery degradation estimation deteriorates under changing real-world conditions
Solution Approach 1:
The patent transforms the fixed aging pattern into a dynamic equivalent aging time that adapts to changing conditions. The equivalent aging time is calculated based on current state of charge, temperature, and charge/discharge rates, allowing the model to dynamically adjust to real-world variations while maintaining a relatively simple structure.
Solution Approach 2:
The patent changes the parameter representation from fixed aging patterns to variable equivalent aging time. By expressing aging effects through equivalent time under reference conditions, the model can accommodate varying operating conditions (temperature, SOC, rates) without requiring complex multi-dimensional aging functions.
2Measurement precision
If the aging model accounts for varying ambient temperature, state of charge, and charging/discharging rates, then the battery degradation estimation accuracy is improved, but the model complexity increases
Solution Approach 1:
The patent introduces equivalent aging time as an intermediary parameter that mediates between multiple aging影响因素 (temperature, SOC, rates) and the final degradation estimation. Instead of directly modeling the complex interactions of all parameters, the equivalent aging time serves as a simplified intermediate representation that captures the cumulative aging effect.
3Productivity
If traditional aging models are used with fixed patterns, then the calculation process is fast and efficient, but the reliability of aging estimation deteriorates under changing conditions
Solution Approach 1:
The patent performs preliminary calculation of equivalent aging time based on current operating conditions before applying it to the aging model. This allows the system to quickly adapt to changing conditions by pre-calculating the equivalent time factor, maintaining calculation efficiency while improving reliability through condition-specific adjustments.
Data Source
AI summary
A system and method for estimating an accumulated total battery aging over different aging patterns. A first aging pattern, first aging time, and aging model are used to determine a battery aging estimation. The aging model, battery aging estimation, and a second aging pattern are used to determine an equivalent previous aging time. By adjusting a second aging time based on the equivalent previous aging time, and applying the adjusted second aging time and second aging pattern to the aging model, a battery accumulated aging estimation is determined for the duration of the first and second aging patterns. The process can be repeated for each next aging pattern, with an equivalent previous aging time being determined for each next aging pattern and used with an associated next aging time, aging model, and next aging pattern to determine an accumulated total battery aging estimation.