Battery Assembly Reuse Control System Using Electrical Parameter Detection

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Solution Overview

Problem

Existing methods for determining the deterioration level of batteries used in electric vehicles are not accurate, leading to potential misuse or improper recycling of batteries.

Innovation Solution

A control system that includes a detector to measure open voltage, internal resistance, and full charge capacity values of batteries, using these parameters to assess whether a battery assembly can be reused by applying specific evaluation criteria.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the deterioration level of the battery is determined based on the number of charging times, full charge capacity value, and number of years used, then the evaluation process is simple, but the determination accuracy is insufficient

Engineering Contradiction:

Improvedetermination accuracy of deterioration levelVSAvoidcomplexity of evaluation parameters

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The invention changes the evaluation parameters from simple operational data (charging times, years used) to comprehensive electrical characteristics (open voltage, internal resistance, full charge capacity). This parameter transformation enables accurate deterioration assessment by measuring the actual physical state of the battery rather than inferring from usage history.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple evaluation parameters are used to accurately determine battery deterioration, then the determination accuracy improves, but the evaluation process becomes more complex

Engineering Contradiction:

Improveaccuracy of battery reuse determinationVSAvoiddifficulty of measuring multiple parameters

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The invention merges the measurement of multiple battery parameters (open voltage, internal resistance, full charge capacity) into a unified evaluation system. By combining these measurements and comparing them against predetermined thresholds, the system achieves accurate deterioration determination while managing the complexity through integrated processing.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system implements feedback by comparing measured parameter values against predetermined reference values and using the results to determine battery reuseability. This feedback mechanism enables automated decision-making, reducing the difficulty of measurement by providing clear criteria for evaluation.

Inventive Principle:

Principle #23Feedback

3Reliability

If the battery assembly is reused without accurate deterioration assessment, then the process is efficient, but degraded batteries may be sold or misused

Engineering Contradiction:

Improvereliability of battery reuse decisionVSAvoidefficiency of battery reuse process

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The invention performs preliminary assessment of battery deterioration before reuse decisions are made. By measuring open voltage, internal resistance, and full charge capacity in advance and comparing them against thresholds, the system ensures reliable determination of battery suitability for reuse, preventing degraded batteries from being sold or misused.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9201118B2Control system for a battery assembly and corresponding method of determining whether a battery assembly can be reused

Publication Date: 2015.12.01 TOYOTA JIDOSHA KK

AI summary

A control system for a battery assembly that consists of a plurality of batteries determines whether the battery assembly can be reused, by using detected values of the open voltage, internal resistance and full charge capacity of each of the batteries, as evaluation parameters.