Battery Rack Degradation Simulation for Faster SOH Verification

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Solution Overview

Problem

Existing battery degradation prediction methods are time-consuming and lack accuracy due to the need for extensive actual measurements and alignment of acceleration factors, making it difficult to verify battery health over long lifespans.

Innovation Solution

A method and apparatus for simulating battery degradation by estimating state of health using relationships among internal resistance, current, and heat generation to predict degradation without actual battery aging, allowing for faster verification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If actual measurement tests are conducted for the entire degradation period, then prediction accuracy is improved, but verification time increases significantly

Engineering Contradiction:

Improvedegradation prediction accuracyVSAvoidverification time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent creates a simulated degraded battery pack by copying the electrical characteristics (internal resistance, heat generation) of an actually degraded battery without requiring actual aging. This allows obtaining degradation data quickly while maintaining prediction accuracy through characteristic parameter replication.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent changes the internal resistance parameter of a new battery pack to match that of a degraded battery pack, thereby simulating the degraded state. By adjusting parameters like internal resistance and heat generation characteristics, the system achieves rapid degradation simulation without time-consuming actual aging tests.

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If accelerated verification methods are used, then verification time is reduced, but prediction accuracy may be compromised due to alignment issues with acceleration factors

Engineering Contradiction:

Improveverification timeVSAvoiddegradation prediction accuracy

Core Design Contradiction:

Loss of timeVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical/physical aging process with an electrical parameter adjustment system. Instead of subjecting batteries to harsh environmental conditions for accelerated aging, the system electrically simulates degradation by modifying internal resistance and heat generation parameters, achieving both speed and accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If numerous acceleration factors are aligned, then prediction accuracy is improved, but device complexity and ease of operation worsen

Engineering Contradiction:

Improvedegradation prediction accuracyVSAvoidacceleration factor alignment complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the essential degradation characteristics (internal resistance and heat generation) from the complex set of acceleration factors. By focusing on these key parameters, the system simplifies the verification process while maintaining prediction accuracy, eliminating the need to align numerous acceleration factors.

Inventive Principle:

Principle #2Taking out (Extraction)

4Measurement precision

If numerous acceleration factors are aligned, then prediction accuracy is improved, but ease of operation worsens

Engineering Contradiction:

Improvedegradation prediction accuracyVSAvoidoperational convenience

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system automatically calculates and adjusts the internal resistance and heat generation parameters based on input data, eliminating the need for manual alignment of acceleration factors. This self-service approach maintains prediction accuracy while significantly improving ease of operation.

Inventive Principle:

Principle #25Self-service

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach significantly reduces verification time by approximately 6 months while maintaining prediction accuracy, enabling efficient battery testing during development.

Implementation Method 1

implement a degraded battery simulation state using a relationship among an internal resistance of the battery, a current flowing through the battery, and an amount of heat generated in a degraded battery pack

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20250208215A1Apparatus and Method for Testing Battery by Estimating Degradation

Publication Date: 2025.06.26 LG ENERGY SOLUTION LTD

AI summary

A method for testing a battery rack including at least one battery pack by estimating state of health may include implementing a degraded battery simulation state using a relationship among internal resistance of the battery, current flowing through the battery, and amount of heat generated and performing a degradation prediction test in the degraded battery simulation state.