Fuel Cell Manifold Block Assembly Cold Start Optimization
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Solution Overview
Problem
Existing manifold block assemblies for fuel cell vehicles face challenges in product quality and productivity due to complex structures, and they cause a significant decrease in air temperature during cold starts, hindering the vehicle's cold startability.
Innovation Solution
A manifold block assembly with integrally formed hydrogen and air discharge paths, a watertight bulkhead, and detachable hydrogen and air inflow pipes made of plastic, which are connected to the fuel cell stack, improving manufacturing simplicity and preventing temperature drop during low-temperature starts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the manifold block assembly uses a complicated structure with all lines integrated in one aluminum block, then all gas and coolant lines can be included in a single component, but manufacturing becomes difficult requiring sand casting which reduces product quality and productivity
Solution Approach 1:
The manifold block assembly is divided into separate components: the manifold block itself and individual line components (air inlet line, air outlet line, hydrogen inlet line, hydrogen outlet line, coolant inlet line, coolant outlet line). This segmentation allows each component to be manufactured separately using appropriate processes, improving both manufacturing precision and productivity while maintaining the integrated functionality of the complete assembly.
2Device complexity
If the manifold block assembly uses sand casting for manufacturing, then a complicated structure can be achieved, but productivity becomes low
Solution Approach 1:
By segmenting the manifold block assembly into separate manufacturable components, the invention enables the use of more efficient manufacturing processes such as die casting or injection molding for individual parts, rather than requiring slow sand casting for a complex integrated structure. This significantly improves productivity while maintaining structural functionality.
3Device complexity
If the air inlet line is made of aluminum, then the manifold block can be manufactured as a single integrated component, but the temperature of inflow air decreases by 6°C or more during cold start-up at -25°C
Solution Approach 1:
The invention changes the material parameter of the air inlet line from aluminum to plastic, which has different thermal conductivity properties. This parameter change reduces heat transfer from the air to the manifold block, thereby maintaining higher air temperature during cold start-up conditions and improving cold startability of the fuel cell vehicle.
Data Source
AI summary
A manifold block assembly for a fuel cell vehicle mounted on a fuel cell stack and supplying air and hydrogen to the stack, includes a manifold block in which a hydrogen discharge path connected to a hydrogen line formed in the stack, an air discharge path connected to an air line formed in the stack, and a watertight bulkhead are integrally formed with each other. The manifold block assembly further includes a hydrogen inflow pipe configured to be attached to the manifold block and connected to the hydrogen line formed in the stack. The manifold block assembly also includes an air inflow pipe configured to be attached to the manifold block and connected to the air line formed in the stack.