Battery Degradation Diagnosis for Secondary Use Matching

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for determining the suitability of lithium-ion secondary batteries for secondary use do not effectively present suitable secondary use destinations, leading to inefficient battery utilization due to lack of technical knowledge required to interpret capacity ratios and degradation states.

Innovation Solution

A power supply device and diagnosis method that calculate multiple degradation parameters of lithium-ion secondary batteries, using a measurer to measure voltage and current, and a deriver to determine optimal secondary use destinations based on these parameters and set degradation rates, thereby extending battery life and improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple degradation parameters are calculated to precisely determine battery status, then measurement precision and diagnosis accuracy are improved, but device complexity and computational requirements increase

Engineering Contradiction:

Improvedegradation state determination accuracyVSAvoidcalculation system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The degradation diagnosis is segmented into multiple independent parameters (positive electrode capacity ratio, negative electrode capacity ratio, deviated capacity) that can be calculated separately based on voltage and current measurements. This segmentation allows precise measurement of different degradation aspects while maintaining manageable computational complexity through modular calculation approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Degradation parameters are calculated and stored in advance during primary use before secondary use begins. This preliminary calculation enables rapid determination of suitable secondary use destinations without requiring complex real-time analysis, thereby improving measurement precision while reducing the computational burden during actual decision-making.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If parameters are optimized automatically after battery coupling to secondary use destination, then adaptability is improved, but it is too late to prevent inefficient battery utilization if wrong destination is selected

Engineering Contradiction:

Improveparameter optimization capabilityVSAvoidtime for efficient battery utilization

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system performs preliminary calculation of multiple degradation parameters and preliminary determination of suitable secondary use destinations before the battery is actually coupled to any secondary use destination. This advance preparation ensures that the battery is directed to the most appropriate application from the outset, preventing time loss and inefficiency while maintaining adaptability through subsequent parameter optimization.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system cushions against poor decision-making by pre-calculating degradation parameters and pre-identifying suitable secondary use destinations. This beforehand analysis acts as a protective measure that ensures optimal battery utilization from the start, preventing the time loss and inefficiency that would otherwise occur from selecting inappropriate secondary use destinations.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Productivity

If comprehensive degradation analysis is performed to identify suitable secondary use destinations, then battery utilization efficiency is improved, but information processing requirements and analytical complexity increase

Engineering Contradiction:

Improvebattery utilization efficiencyVSAvoiddata processing burden

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The system extracts only the essential degradation information needed for secondary use destination determination from comprehensive battery data. By calculating specific key parameters (positive electrode capacity ratio, negative electrode capacity ratio, deviated capacity) rather than processing all possible battery data, the system improves battery utilization efficiency while minimizing information processing burden through selective data extraction.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system transforms complex battery degradation data into simplified, actionable parameters that directly indicate suitable secondary use destinations. By changing the form of degradation information from raw comprehensive data to standardized capacity ratios and deviated capacity values, the system achieves high battery utilization efficiency while reducing the complexity of information processing and comparison across different batteries.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250012870A1Power supply device, diagnosis device, and diagnosis method

Publication Date: 2025.01.09 MURATA MFG CO LTD

AI summary

A power supply device is provided and includes a secondary battery, an electric circuit, and a measurer. The electric circuit performs charging or discharging of the secondary battery. The measurer measures a voltage and a current of the secondary battery. The power supply device further includes a calculator and a deriver. The calculator performs calculation of multiple degradation parameters of the secondary battery based on measurement values obtained by the measurer. The deriver derives a secondary use destination of the secondary battery based on the multiple degradation parameters obtained by the calculation performed by the calculator and respective degradation rates of the multiple degradation parameters set for each of secondary use destination candidates.