Fuel Cell Stack Voltage Probe for Dimensional Measurement
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Solution Overview
Problem
In electrical power systems, particularly fuel cell stacks, it is challenging to accurately measure the voltage of each component without disrupting the system or causing short circuits, especially at elevated temperatures, and to determine dimensional changes during sintering and conditioning processes.
Innovation Solution
A system and method using a probe assembly with electrically conductive ceramic materials and a motion control system to move the probe along the fuel cell stack, allowing for contact or non-contact voltage measurements and dimensional data extraction, using ceramic matrix composites and differential voltage readings to assess the health and performance of fuel cell stacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage probe is moved along the fuel cell stack to measure voltage of each component, then measurement capability is improved, but the complexity of the measurement system increases
Solution Approach 1:
The probe assembly is designed to perform multiple functions: voltage measurement, dimensional measurement, and positional tracking. By integrating these functions into a single multi-functional device, the patent reduces the need for separate measurement systems while maintaining comprehensive measurement capabilities throughout the fuel cell stack.
Solution Approach 2:
The patent combines voltage measurement electrodes with dimensional measurement capabilities and motion control systems into a single integrated probe assembly. This merging of measurement functions allows simultaneous acquisition of electrical and physical parameters, simplifying the overall measurement system architecture.
2Measurement precision
If contact probes are used to measure voltage at elevated temperatures, then measurement capability is improved, but the risk of short circuits and system disruption increases
Solution Approach 1:
The patent introduces an intermediary probe assembly that interfaces with the fuel cell stack through controlled contact. The probe uses ceramic materials as electrical insulators and conductors, which serve as intermediaries between the measurement system and the high-temperature fuel cell environment, enabling accurate measurements while preventing short circuits and maintaining system stability.
Solution Approach 2:
The probe assembly utilizes materials with specific thermal and electrical properties that change parameters suitable for high-temperature operation. Ceramic materials maintain electrical insulation at elevated temperatures while allowing controlled conduction for measurement, enabling reliable voltage measurement without disrupting the fuel cell stack operation.
3Measurement precision
If sequential voltage measurements are taken to determine dimensional values, then dimensional measurement capability is improved, but the measurement time increases
Solution Approach 1:
The probe assembly continuously moves along the fuel cell stack while simultaneously performing voltage measurements and dimensional measurements. This continuous scanning approach eliminates idle time between measurements, allowing sequential data collection to occur in a single continuous operation rather than through discrete measurement cycles.
Solution Approach 2:
The system performs preliminary calibration and positioning of the probe assembly before actual measurements begin. Motion control parameters are pre-configured, and the probe is positioned at known reference points in advance, allowing the sequential measurement process to proceed efficiently without time-consuming setup during the actual measurement cycle.
Data Source
AI summary
A measurement device for measuring voltages along a linear array of voltage sources, such as a fuel cell stack, includes at least one movable voltage probe that measures voltage transitions along an array element. The measured voltage is used to determine a distance of travel of the at least one voltage probe along the fuel cell stack from the speed of the probe and the timing of the transitions.