Fuel Cell Stack State Detection via Valve-Modulated Fluid Flow

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Solution Overview

Problem

Existing methods for monitoring the operating state of electrochemical systems, such as fuel cell stacks, are inefficient in recognizing critical states due to inability to compensate for nonlinearities in signal transmission, leading to unreliable voltage and current signal analysis.

Innovation Solution

A method involving the use of valves to cyclically or pulsedly vary fluid flow through an electrochemical system, allowing for the determination of operating states by analyzing voltage and current responses without requiring additional power electronics, and enabling differentiation between anode and cathode sections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If voltage and current signal monitoring is performed in electrochemical systems, then operating state detection is enabled, but reliability of critical state recognition deteriorates due to inability to compensate for nonlinearities in signal transmission

Engineering Contradiction:

Improvereliability of critical state recognitionVSAvoidmeasurement precision of voltage and current signals

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent replaces electrical signal imprinting methods with mechanical fluid flow modulation. By varying fluid flow rates through the electrochemical system, operating state information is obtained without introducing electrical nonlinearities, thus improving measurement precision while maintaining reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces fluid flow as an intermediary parameter to indirectly probe the operating state of the electrochemical system. This intermediary approach avoids direct electrical measurement issues and allows reliable detection of critical states through fluid dynamic responses

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If additional power electronics are used for signal imprinting, then operating state determination capability is improved, but device complexity and cost increase

Engineering Contradiction:

Improveoperating state determination capabilityVSAvoiddevice complexity of power electronics

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent substitutes electrical power electronics with mechanical fluid control components. Fluid flow rate variation achieves the same diagnostic capability as electrical signal imprinting but with significantly reduced device complexity and elimination of power electronic components

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent makes existing fluid supply infrastructure serve dual purposes: both operational fluid delivery and diagnostic probing. The fluid supply system becomes multi-functional, eliminating the need for separate dedicated diagnostic equipment

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Measurement precision

If fluid flow is varied through predefined patterns, then operating state detection accuracy is improved, but loss of time due to cyclic modulation increases

Engineering Contradiction:

Improveoperating state detection accuracyVSAvoidtime loss due to cyclic fluid modulation

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent employs periodic fluid flow modulation with specifically selected frequencies and patterns. By optimizing the periodic characteristics, the method achieves high detection accuracy while minimizing time penalties, as the cyclic nature allows for efficient signal averaging and noise reduction

Inventive Principle:

Principle #19Periodic action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for reliable, cost-effective, and efficient determination of operating states in electrochemical systems, enabling early detection of critical conditions and adaptive fluid supply adjustments, superior to prior art methods.

Implementation Method 1

electrochemical system comprises a cell stack having at least one electrode section... determining a voltage response and/or a current response of the cell stack

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Data Source

PatentUS11824239B2Method for determining an operating state of an electrochemical system

Publication Date: 2023.11.21 AVL LIST GMBH

AI summary

The invention relates to a method for determining an operating state of an electrochemical system (1a; 1b; 1c; 1d; 1e), which has a cell stack (2) having at least one electrode portion (3, 4), at least one valve (5, 6, 20, 21) and at least one fluid line (23) being provided, the method comprising the following steps: conducting, in a varying manner, at least one fluid through the at least one valve (5, 6, 20, 21) via the at least one fluid line (23) with a predefined variation pattern, the variation pattern being applied to a fluid flow by means of the at least one valve (5, 6, 20, 21), determining a voltage response and/or a current response of the cell stack (2) during the varying conducting of the at least one fluid, and determining the operating state of the electrochemical system (1a; 1b; 1c; 1d; 1e) on the basis of the voltage response and/or the current response. The invention further relates to a computer program product (11), to a storage means (12), to a circuit assembly (13) and to an electrochemical system (1a; 1b; 1c; 1d; 1e).