Battery SOC Verification via Dual-Algorithm Cross-Check

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Solution Overview

Problem

Existing methods for estimating the state of charge (SOC) of batteries are not always accurate due to defects in the estimating methods themselves, leading to unreliable results even after verification.

Innovation Solution

A battery control device that includes a charge state calculator and a verifier, using different calculation methods to validate the SOC results, thereby improving reliability by mutual verification between multiple methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the same estimating method is used for verification, then the verification process is simple, but the verified result may still include errors if the estimating method itself has defects

Engineering Contradiction:

Improveaccuracy of SOC estimationVSAvoidcomplexity of verification method

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a verification unit as an intermediary component that employs a different estimating method to validate the results produced by the calculation unit. This mediator approach allows cross-verification between diverse algorithms, preventing systematic errors from propagating while maintaining a clear separation of functions between calculation and verification processes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the parameter of the estimating method itself by employing fundamentally different algorithms for calculation and verification. Instead of using the same method with adjusted parameters, the system uses diverse estimating approaches (e.g., different mathematical models or algorithms) to ensure that verification truly challenges the calculation results and identifies method-specific defects

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple different calculating methods are used for mutual verification, then the reliability of calculated results is improved, but the device complexity increases

Engineering Contradiction:

Improvereliability of SOC calculationVSAvoidstructure of control device

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the battery control device into distinct functional units: a calculation unit that performs SOC estimation and a verification unit that validates the results. This segmentation allows each unit to specialize in its specific function while working together, improving reliability through diversity without creating a monolithic complex system that is difficult to manage and maintain

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If verification is performed using the same estimating method multiple times, then the verification process is straightforward, but it cannot detect defects in the estimating method itself

Engineering Contradiction:

Improvesimplicity of verification processVSAvoidaccuracy of verification result

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

Instead of verifying calculation results by repeating the same calculation process, the patent inverts the approach by using a fundamentally different estimating method for verification. This inversion ensures that the verification process challenges the calculation results from a different theoretical perspective, enabling detection of method-specific defects that would be invisible to repeated applications of the same method

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS9689926B2Battery controlling using charge state calculator and charge state verifier

Publication Date: 2017.06.27 VEHICLE ENERGY JAPAN INC

AI summary

The purpose of the present invention is to provide a battery control device that can appropriately verify the results of the estimation of the state of charge of a battery. This battery control device is provided with a charged state calculation unit that calculates the state of charge of the battery and a charged state verification unit that verifies the results of the calculation. The charged state verification unit calculates the charged state using a calculation procedure that is not being used by the charged state calculation unit.