Fuel Cell End Plate Fluid Management Integration
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Solution Overview
Problem
Fuel cell systems require complex and bulky gas and coolant management installations, which increase size and weight, making them difficult to integrate into vehicles and costly to manufacture, while also complicating maintenance and repair.
Innovation Solution
An end plate design that integrates fluid management elements, including chambers for heat transfer fluid supply and recirculation, pumps, and solenoid valves, allowing for compact integration of gas and coolant management systems within the fuel cell stack, reducing external piping and enabling easy assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fluid management elements are distributed between several plates arranged in the stacking direction, then fluid management functionality is provided, but the size of the stack in the stacking direction is substantially increased
Solution Approach 1:
The patent consolidates multiple fluid management elements (manifolds, recirculation bodies, mixing elements, pumps, valves) that were previously distributed across several plates into a single integrated end plate. This merging of functions into one component reduces the overall stack length in the stacking direction while maintaining complete fluid management capability.
Solution Approach 2:
The end plate is designed as a multi-functional component that simultaneously performs structural support, gas distribution, coolant management, and recirculation functions. By making the end plate universal and capable of housing all fluid management elements, the design eliminates the need for multiple separate plates, thereby reducing stack length.
2Manufacturing precision
If a complex gas management installation is used to control pressure, temperature, humidity, and recirculation rate, then precise parameter control is achieved, but the installation becomes bulky as large as the cell itself
Solution Approach 1:
The patent nests multiple fluid management components within the end plate structure itself. Manifolds, recirculation bodies, and mixing elements are integrated into the end plate's internal architecture, allowing complex functionality to be contained within a compact volume rather than requiring separate external installations.
Solution Approach 2:
The design merges gas management and coolant management systems into the same end plate structure, combining previously separate installations into a unified compact system that maintains precise control capability while dramatically reducing overall volume.
3Reliability
If robust end plates with sufficient pressure distribution are used to seal the stack and ensure electrical conduction, then sealing and electrical performance are improved, but the end plates become heavier and more complex
Solution Approach 1:
The end plate is designed to simultaneously provide mechanical sealing, electrical conduction, and complete fluid management functionality. By integrating all these functions into a single multi-functional component, the design avoids the need for additional separate components that would increase weight and complexity.
Solution Approach 2:
The patent combines structural support functions with fluid management functions in the same end plate. The robust pressure distribution requirements for sealing are merged with the fluid distribution requirements, allowing a single optimized structure to fulfill both demands without requiring separate heavy components.
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 design reduces the bulk and weight of the fuel cell system, simplifies manufacturing, and facilitates vehicle integration by minimizing external connections, enhancing reliability and manufacturing efficiency while allowing for easy maintenance and repair.
Implementation Method 1
the cell is preferably passed through by a heat transfer fluid such as water
Implementation Method 2
the recirculation body comprising a mixing element for mixing the fresh gas coming from the supply pipe and the gas coming from the part recirculation
Data Source
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AI summary
A fuel cell (FC) has an alternating stack of bipolar plates and ion exchange membranes. The stack is compressed by tie rods parallel to the direction of the stack and anchored on both sides of two end plates. A fluid management installation, partially integrated inside one of the end plates, has pumps (E8h, E8o) and purge solenoid valves (E10h, E10o) to regulate the pressure of gases such as hydrogen and oxygen, and a Venturi effect device (Vh) to recycle the gases not consumed by the cell and elements to remove the water produced by the cell.