Battery Control Device for Accurate Power Prediction

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Solution Overview

Problem

Existing power storage systems face challenges in accurately predicting chargeable and dischargeable power amounts due to characteristic variations and deterioration in secondary batteries, leading to inefficiencies in balancing supply and demand, which results in high imbalance rates and operational margins.

Innovation Solution

A storage battery controlling device that calculates internal resistance and open circuit voltage relationships to accurately determine inputtable/outputtable power amounts, using a battery characteristic estimator and input/output performance calculator, allowing for real-time adjustments to maintain power balance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a standard across-the-board characteristic value table is used for prediction, then the prediction method is simple, but characteristic variation among individual secondary batteries and characteristic deterioration advancing over time cannot be dynamically handled, causing large error in charge/discharge power prediction value

Engineering Contradiction:

Improveprediction method simplicityVSAvoidcharge/discharge power prediction accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent implements dynamic updating of battery characteristic values by continuously monitoring actual charge/discharge behavior and adjusting the characteristic value table in real-time, allowing the system to adapt to individual battery variations and deterioration while maintaining operational simplicity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system incorporates feedback mechanisms where actual battery performance data is fed back to update the characteristic value table, enabling continuous improvement of prediction accuracy without requiring complex manual recalibration or test procedures

Inventive Principle:

Principle #23Feedback

2Measurement precision

If test charge/discharge is performed for every fixed period to update characteristic value data, then characteristic variation and deterioration progress can be handled, but test charge/discharge takes time and accuracy in instantaneous input/output control is low

Engineering Contradiction:

Improvecharge/discharge power prediction accuracyVSAvoidtest charge/discharge time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs lightweight characteristic updates during normal partial charge/discharge operations rather than requiring complete test cycles, enabling continuous improvement of prediction accuracy without significant time loss or disruption to normal battery usage

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary characteristic value updates using available operational data before full test charge/discharge is needed, maintaining accurate predictions while minimizing the frequency and duration of comprehensive testing

Inventive Principle:

Principle #10Preliminary action

3Reliability

If prediction value is estimated to be small to secure operational margin, then operational safety is improved, but charge/discharge amount prediction system performance is practically low

Engineering Contradiction:

Improveoperational margin securityVSAvoidcharge/discharge amount prediction system performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent dynamically adjusts prediction values based on updated battery characteristic data, allowing the system to optimize the balance between operational margin and prediction performance by modifying prediction parameters according to actual battery state and conditions

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10644359B2Storage battery controlling device, controlling method, non-transitory computer readable medium, power storage system, and power system

Publication Date: 2020.05.05 KK TOSHIBA

AI summary

A storage battery controlling device according to an embodiment of the present invention includes: a battery characteristic estimator configured to calculate an internal resistance of a secondary battery and a function indicating relationship between an open circuit voltage of the secondary battery and a state of charge or an amount of a charge charged of the secondary battery therein, on the basis of data of a temperature, a voltage and a current of the secondary battery which are measured in charging or discharging the secondary battery; and an input/output performance value calculator configured to calculate an inputtable/outputtable power amount of the secondary battery on the basis of the internal resistance and the function calculated by the battery characteristic estimator.