Fuel Cell Stack Tightening Members for Impact Load Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell stacks used in vehicles have insufficient structural strength to withstand external impacts, particularly at corners where fluid passages are often located, leading to potential positional displacement and inadequate load reception.
Innovation Solution
A fuel cell stack design featuring laterally elongated end plates with first and second tightening members, where extensions on the fuel cells engage with recessed portions of the tightening members, enhancing load reception and minimizing positional displacement through a simple and compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional corner load support members are used at four corners of the fuel cell stack, then the structure is simple, but the strength is insufficient and impact load cannot be received sufficiently
Solution Approach 1:
The tightening members are divided into multiple segments along the longitudinal direction, with each segment having recessed portions that engage with extensions on the fuel cell stack. This segmentation allows the load to be distributed to multiple engagement points, significantly improving impact load reception capability while maintaining a relatively simple overall structure.
Solution Approach 2:
The tightening members extend in the longitudinal direction (adding a dimensional element) rather than only providing point support at corners. This dimensional extension creates multiple engagement points along the length of the stack, transforming point support into line support and dramatically improving strength against impact loads.
2Adaptability or versatility
If fluid passages are provided at four corners of the fuel cell stack, then the fluid distribution is improved, but the strength at corners becomes insufficient
Solution Approach 1:
The tightening members provide localized reinforcement at multiple points along the longitudinal direction where recessed portions engage with extensions. This creates locally strengthened zones that can withstand impact loads while allowing fluid passages to be freely configured at the corners without compromising overall structural strength.
3Power
If a large number of power generation cells are stacked to meet vehicle requirements, then the power output is sufficient, but positional displacement becomes more difficult to control
Solution Approach 1:
The extensions are pre-formed on the fuel cell stack at specific positions along the longitudinal direction, and the tightening members are designed with corresponding recessed portions. This preliminary configuration ensures that when the tightening members are installed, they automatically engage at the correct positions, maintaining precise alignment even when stacking a large number of cells.
Solution Approach 2:
By extending the tightening members in the longitudinal direction and creating multiple engagement points, the system transforms from point-based positioning to line-based positioning. This dimensional approach provides continuous positional constraint along the length of the stack, making it easier to control positional displacement when stacking many cells.
Data Source
AI summary
A fuel cell stack includes fuel cells stacked in a stacking direction, a first end plate a second end plate, and first tightening members and second tightening members. The first tightening members couple long sides of the first end plate and long sides of the second end plate, and extend in the stacking direction. The second tightening members couple short sides of the first end plate and short sides of the second end plate, and extend in the stacking direction. Extensions are formed on both of long sides of the fuel cell, and the first tightening members have recessed portions engaged with the extensions.