Power Storage Charge-Time Estimation With Charge Stop Modeling

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Solution Overview

Problem

Conventional power storage apparatuses employing the bank switch method experience inaccuracies in remaining charge time estimation due to the absence of consideration for charge stop times, limiting the accuracy of charge time predictions.

Innovation Solution

A power storage control apparatus that computes the remaining charge time through linear approximation of the correlation between the operating environment and charge time, including charge stop time, using a processor to improve estimation accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the conventional remaining charge time computing method using SOC integration is employed, then the computation is simple, but the accuracy of remaining charge time estimation is insufficient due to charge stop time

Engineering Contradiction:

Improveremaining charge time estimation accuracyVSAvoidcomputation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the computation parameters from simple SOC integration to a comprehensive model that includes charging current, charge stop time, and battery temperature. This parameter expansion resolves the accuracy issue by capturing the actual charging process characteristics, including the previously ignored charge stop time periods.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the simple mathematical integration method with a more sophisticated computation model that uses processor-based calculations. This substitution enables the system to handle complex parameters like charge stop time and temperature compensation, achieving higher accuracy through computational power rather than simple mathematical operations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If the bank switch method is used for power storage device management, then continuous power supply is enabled, but charge stop time occurs between device switches

Engineering Contradiction:

Improvecontinuous power supply capabilityVSAvoidcharge stop time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent converts the harmful effect of charge stop time into a beneficial factor by explicitly measuring and incorporating it into the remaining charge time computation. Instead of treating charge stop time as wasted time that degrades performance, the invention uses it as a correction factor that improves the accuracy of charge time estimation, turning a system limitation into a source of computational accuracy.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS20230393201A1Power storage control apparatus, power storage apparatus, remaining charge time computing method, and non-transitory computer-readable storage medium storing remaining charge time computing program

Publication Date: 2023.12.07 FDK CORP

AI summary

A power storage control apparatus includes a processor that computes a remaining charge time of a power storage apparatus that supplies power to a load apparatus operating by power supply from an external power source in case of a power supply emergency of the external power source, and the processor computes the remaining charge time of the power storage apparatus based on linear approximation of correlation between an operating environment of the power storage apparatus and a charge time of the power storage apparatus including a charge stop time.