Battery Degradation Estimation via Virtual Modeling

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Solution Overview

Problem

Current methods for estimating battery degradation in electric vehicles (EVs) are inaccurate due to variations in usage conditions, vehicle models, and external environments, leading to inefficiencies in battery rental, exchange, and utilization, and are not suitable for rapid degradation assessment without damaging the battery.

Innovation Solution

A system and method for accurately estimating battery degradation by collecting and processing data on battery parameters, creating and updating a degradation model, and using this model to compute battery degradation, incorporating factors like charge-discharge cycles, usage environment, and vehicle-related parameters, which allows for flexible battery pack configurations and reduced costs through accurate residual life estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If battery degradation is estimated through charge and discharge experiments, then degradation data can be obtained, but the process takes a long time and is detrimental to the battery

Engineering Contradiction:
Improvedegradation data accuracyVSAvoidtesting time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent creates a virtual degradation model that replicates the effects of charge-discharge experiments through computational simulation rather than physical testing. The model copies the degradation behavior by processing operational data (charge/discharge cycles, temperature, current) through algorithms that predict capacity loss without actually subjecting the battery to stressful testing conditions.

Inventive Principle:
Principle #26Copying

Solution Approach 2:

The patent replaces the mechanical/physical charge-discharge testing system with an information-processing system. Instead of applying electrical stress to physically degrade the battery and measure results, the system uses data processing and computational models to estimate degradation based on operational parameters, substituting physical experimentation with information analysis.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If conventional degradation estimation methods are used, then some degradation data can be obtained, but the accuracy is insufficient due to variations in usage conditions, vehicle models, and external environments

Engineering Contradiction:
Improvedegradation estimation accuracyVSAvoidadaptability to different usage conditions
Core Design Contradiction:
Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent segments the degradation estimation process into multiple independent components: operational data collection, parameter processing, model selection, and degradation calculation. Each component handles specific aspects (charge-discharge cycles, temperature effects, current patterns), allowing the system to adapt to different usage conditions by weighting or emphasizing relevant segments based on the specific operational context.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements a dynamic degradation model that continuously adapts to changing usage conditions. The model processes real-time operational data and adjusts degradation estimates based on varying parameters such as temperature fluctuations, charge-rate changes, and usage patterns. This dynamic approach allows the system to maintain accuracy across diverse vehicle models and environmental conditions rather than relying on static assumptions.

Inventive Principle:
Principle #15Dynamics

3Quantity of substance

If battery capacity is increased to meet energy demands, then energy storage improves, but the cost of the battery increases significantly

Engineering Contradiction:
Improvebattery capacityVSAvoidbattery cost
Core Design Contradiction:
Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent performs preliminary degradation assessment throughout the battery's operational life rather than waiting until capacity is fully depleted. By continuously monitoring operational parameters and estimating degradation in advance, the system identifies the optimal replacement timing before performance significantly deteriorates. This allows planners to schedule battery replacements proactively, avoiding emergency replacements at higher costs and maximizing the useful life of high-capacity batteries.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where degradation estimates inform battery management decisions. The system continuously monitors operational data, updates degradation models, and uses this information to optimize battery usage patterns, charging strategies, and replacement scheduling. This feedback loop enables more efficient utilization of expensive high-capacity batteries, extending their effective service life and reducing overall cost per unit of energy delivered.

Inventive Principle:
Principle #23Feedback

Data Source

PatentUS9217779B2Method and system for obtaining degradation of battery using degradation model and parameters related to the degradation
Publication Date: 2015.12.22 PANASONIC HOLDINGS CORP
  • US9217779B2 patent drawing
  • US9217779B2 patent drawing
  • US9217779B2 patent drawing

AI summary

The present disclosure provides a method for obtaining degradation of a battery comprising the steps of collecting data of the battery and data related to the degradation of the battery; processing the collected data to obtain parameters related to the degradation of the battery; creating and updating a degradation model for the battery with the obtained parameters; and computing the degradation of the battery by using the degradation model and the parameters.