Fuel Cell Stack Endplate With Elastic Volume Compensation
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Solution Overview
Problem
Existing fuel cell stacks face challenges in maintaining uniform surface pressure and fastening force, leading to deformation and damage when the volume of the stack changes, which compromises durability and safety.
Innovation Solution
A fuel cell module design that includes an elastic member compressible between the endplate and the enclosure, allowing for a variable volume space that adjusts with changes in the fuel cell stack volume, thereby maintaining uniform surface pressure and fastening force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of the fuel cell stack is increased, then the power generation capacity is improved, but the surface pressure and fastening force become concentrated on particular sites causing deformation and damage
Solution Approach 1:
The endplate is designed with a dynamic capability to elastically deform in the stacking direction in response to volume changes of the fuel cell stack. This elasticity allows the endplate to adapt its shape rather than maintaining a rigid fixed form, thereby distributing mechanical stresses uniformly across the entire stack surface and preventing localized concentration of fastening forces that would cause deformation or damage.
Solution Approach 2:
The patent changes the physical state and mechanical properties of the endplate by introducing elastic characteristics. The endplate's ability to elastically deform changes its rigidity parameter, allowing it to flex and redistribute pressure uniformly across the stack surface when volume changes occur, thus preventing stress concentration and improving reliability.
2Device complexity
If the fastening member supports only a particular site of the endplate, then the device complexity is reduced, but the unsupported portions deform when volume changes
Solution Approach 1:
The endplate is designed as a flexible thin-walled structure capable of elastic deformation. This flexible shell design allows the endplate to bend and adapt its shape in response to volume changes without requiring additional support members, maintaining shape stability through material elasticity rather than structural complexity.
Solution Approach 2:
The elastic endplate serves itself by using its own material properties to distribute stresses uniformly across its surface. Rather than requiring external support structures or complex fastening systems, the endplate's inherent elasticity enables it to self-adjust and maintain structural integrity during volume changes.
3Manufacturing precision
If rigid endplates are used, then the manufacturing precision is improved, but the fuel cell stack deforms when volume changes
Solution Approach 1:
The endplate transitions from a rigid static component to a dynamic elastic component that can deform in the stacking direction. This dynamic capability allows the endplate to accommodate volume changes of the fuel cell stack while maintaining uniform surface pressure, preventing deformation of the overall stack shape despite the loss of rigid dimensional stability.
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 design effectively minimizes deformation and damage to the fuel cell stack, enhances safety and reliability, and improves sealing, waterproofing, and dustproofing performance while ensuring uniform pressure distribution.
Implementation Method 1
an elastic member provided to be elastically compressible between an end of the endplate and the enclosure based on a stacking direction of the unit cells
Data Source
AI summary
In an embodiment, a fuel cell module can include a fuel cell stack, an endplate configured to cover an end of the fuel cell stack based on a stacking direction of the unit cells, a clamp member configured to surround the fuel cell stack and support the fuel cell stack, an enclosure configured to surround the fuel cell stack and the clamp member, and an elastic member provided to be elastically compressible between the end of the endplate and the enclosure based on the stacking direction of the unit cells, wherein the elastic member is configured to define a variable volume space between the end of the endplate and the enclosure such that the variable volume varies depending on a change in volume of the fuel cell stack.