Cell Stack Device Bonding Material Orientation
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Solution Overview
Problem
Existing cell stack devices face issues with electrical conductivity due to the use of insulating alumina materials and warping during manufacturing, which can lead to cracking and peeling of electrically conductive members, affecting the performance and reliability of fuel cells.
Innovation Solution
A cell stack device with columnar cells and an electrically conductive member connected using a bonding material containing conductive particles and insulating fibrous bodies, where the fibrous bodies are oriented perpendicular to the cells to enhance electrical conductivity and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cells are manufactured with high precision to avoid warping, then the manufacturing precision is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The bonding material is designed with alumina fibrous bodies that suppress firing shrinkage and prevent crack formation during the manufacturing process. This beforehand cushioning effect compensates for warping and dimensional changes that occur during firing, allowing cells to be manufactured with acceptable precision without requiring excessively complex manufacturing processes or post-processing steps.
Solution Approach 2:
The invention modifies the chemical composition and physical properties of the bonding material by incorporating alumina fibrous bodies with specific characteristics (high refractoriness, low shrinkage). These parameter changes in the bonding material enable it to withstand and compensate for thermal and mechanical stresses during manufacturing, reducing the need for ultra-precise manufacturing controls.
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 solution improves electrical conductivity and reduces cracking, leading to enhanced performance and reliability of the cell stack device by optimizing the orientation of fibrous bodies within the bonding material.
Implementation Method 1
a bonding material having electrically conductive property... The bonding material contains electrically conductive particles and fibrous bodies having electrically insulating properties
Data Source
AI summary
A cell stack device (1) according to the present invention includes a plurality of cells (3) having a columnar shape; andelectrically conductive members (4) interposed between adjacent cells (3) of the plurality of cells (3),and connected to the each adjacent cell (3) with a bonding material (15) having electrically conductive property. The bonding material (15) contains electrically conductive particles and fibrous bodies (16) having electrically insulating properties, and a major axis direction of the fibrous bodies (16) is oriented in a predetermined direction in regions where the electrically conductive members (4) face to the each adjacent cell (3).