Fuel Cell Stack Tensioning With Springs for Uniform Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell stacks face challenges in being pressed together precisely and efficiently, with existing solutions often lacking simplicity and uniform force distribution, leading to suboptimal sealing and inadequate handling of temperature-induced length changes.
Innovation Solution
A tensioning system comprising a pressure plate, tensioning element, spring element, and tensioning device that applies a uniform pressure force along a spring axis, allowing for automated and precise bracing of the fuel cell stack, with spring elements absorbing temperature-induced changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuel cell stack is pressed together to ensure sealing, then sealing quality improves, but the system becomes more complex and difficult to assemble
Solution Approach 1:
The tensioning system is divided into modular components: a pressure plate with contact surface, a tensioning element, spring elements, and a tensioning device. This segmentation allows each component to be optimized independently and simplifies assembly and maintenance while ensuring uniform sealing pressure across the fuel cell stack.
2Device complexity
If manual bracing methods are used, then system complexity is reduced, but manufacturing precision and force distribution uniformity deteriorate
Solution Approach 1:
The pressure plate serves as an intermediary component that distributes the tensioning force uniformly across the contact surface of the fuel cell stack. This mediator ensures precise and uniform force distribution, enabling automated assembly while maintaining high manufacturing precision for sealing.
3Stability of the object's composition
If rigid bracing structures are used, then structural stability improves, but adaptability to temperature-induced length changes deteriorates
Solution Approach 1:
The spring elements are arranged between the pressure plate and the fuel cell stack, allowing the bracing system to dynamically adapt to temperature-induced length changes. The springs provide continuous contact pressure while accommodating thermal expansion and contraction, maintaining sealing force under varying temperature conditions.
4Productivity
If automated tensioning systems are implemented, then productivity improves, but device complexity increases
Solution Approach 1:
The spring elements automatically maintain contact pressure between the pressure plate and the fuel cell stack without requiring continuous external actuation. This self-service mechanism enables automated assembly processes while keeping the system relatively simple, as the springs inherently provide the necessary tensioning force throughout operation.
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
The system enables uniform force distribution and precise sealing of fuel cells, accommodating temperature-induced expansions while facilitating automated assembly and maintaining consistent pressure throughout the fuel cell stack.
Implementation Method 1
the spring element can absorb, in particular, temperature-induced length changes of the fuel cell stack in the stack direction
Data Source
AI summary
A tensioning system for a fuel cell stack includes a pressure plate with a contact surface for bearing against the fuel cell stack, a tensioning element which is arranged on a side of the pressure plate which is opposed to the contact surface, at least one spring element which is arranged between the pressure plate and the tensioning element and has a spring axis, along which the at least one spring element can be tightened, and at least one tensioning device. The tensioning device is designed to exert a pressure force on the tensioning element. The pressure force is directed along the spring axis and in the direction of the pressure plate. The tensioning element is configured to transmit the pressure force with pre-tightening of the at least one spring element to the pressure plate.