Fuel Cell Voltage Detection Segmentation for Cost Reduction
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Solution Overview
Problem
The existing fuel cell systems face challenges in accurately determining fuel deficiency states across multiple unit cells without significantly increasing manufacturing costs, as current voltage detectors require high costs when detecting voltage for each unit cell individually.
Innovation Solution
A fuel cell system with two sets of unit cells, where one set has a voltage detector for every 'N' unit cells and another for the entire fuel cell, using a controller to determine fuel deficiency states based on predetermined conditions such as temperature and stoichiometric ratios, and performing cancellation processes to address deficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is detected for each unit cell individually, then measurement precision of fuel deficiency state is improved, but manufacturing cost increases
Solution Approach 1:
The system segments the voltage detection function across multiple detectors: one detector monitors every N unit cells while another monitors every M unit cells (where M > N). This segmentation allows the system to maintain high measurement precision for fuel deficiency detection while reducing the total number of detectors required compared to monitoring every unit cell individually, thereby lowering manufacturing costs.
Solution Approach 2:
The system applies partial monitoring action by having the first detector monitor every N unit cells and the second detector monitor every M unit cells (M > N). This partial monitoring approach provides sufficient information to determine fuel deficiency states with high accuracy without requiring complete monitoring of every single unit cell, thus reducing manufacturing cost while maintaining measurement precision.
2Measurement precision
If high-cost voltage detector is installed on each fuel cell, then measurement precision is improved, but manufacturing cost of fuel cell system increases
Solution Approach 1:
The voltage detectors are designed with multi-functionality to monitor multiple unit cells simultaneously. The first detector monitors every N unit cells and the second detector monitors every M unit cells across multiple fuel cells. This universal monitoring approach allows a single detector to perform the function of multiple detectors would otherwise be needed, maintaining measurement precision while reducing the total number of detectors and system manufacturing cost.
Solution Approach 2:
The system uses multiple detectors with different monitoring intervals (every N cells and every M cells) to create a comprehensive monitoring coverage. By strategically positioning detectors to monitor different subsets of unit cells, the system copies the essential monitoring function across multiple detectors, achieving high measurement precision through coordinated partial monitoring rather than requiring expensive comprehensive monitoring on every fuel cell.
3Ease of manufacture
If voltage detection interval is increased, then manufacturing cost is reduced, but measurement precision deteriorates
Solution Approach 1:
The monitoring system is segmented into two detector groups with different intervals: the first detector monitors every N unit cells while the second detector monitors every M unit cells (M > N). This segmentation creates a hierarchical monitoring structure where the first detector provides more frequent monitoring for critical detection, and the second detector provides broader coverage with less frequent monitoring, together achieving high measurement precision while reducing total detector count and manufacturing cost.
Solution Approach 2:
The system changes the monitoring interval parameter across different detector groups. By setting different intervals (N and M where M > N), the system optimizes the balance between measurement precision and manufacturing cost. The first detector uses a smaller interval N for higher precision on its monitored cells, while the second detector uses a larger interval M to reduce its cost, and the combination of both provides overall high precision at reduced total cost.
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 reduces manufacturing costs while maintaining high accuracy in determining fuel deficiency states and improving the overall performance of the fuel cell system by efficiently managing fuel supply.
Implementation Method 1
a first voltage detector connected to the first fuel cell, a second voltage detector connected to the second fuel cell
Implementation Method 2
a first fuel cell to which a fuel gas and an oxidant gas are supplied and which includes a plurality of first unit cells stacked together
Data Source
AI summary
A fuel cell system includes a first fuel cell, second fuel cell, first voltage detector, second voltage detector, and controller. The first voltage detector detects voltage of first unit cells of the first fuel cell for every “N” unit cells on average, and the second voltage detector detects voltage of the second fuel cell as a whole, or detects voltage of second unit cells of the second fuel cell for every “M” unit cells on average, where “M” is larger than “N”. The controller determines whether any of the second unit cells is in a fuel deficiency state, based on the detection result of the first voltage detector, when a predetermined condition under which states of the first fuel cell and the second fuel cell are regarded as being close to each other is satisfied.