Electrochemical Cell Stack Thermal Management
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Solution Overview
Problem
In solid oxide fuel cell (SOFC) and electrolysis cell stacks, the downstream units experience decreased hydrogen concentration and temperature due to heat absorption, leading to poor electricity generation performance.
Innovation Solution
The configuration of the electrochemical reaction cell stack, where upstream units are positioned between heat-absorbing members and downstream units, maintains higher hydrogen concentration in upstream units, reducing the impact of temperature decrease on downstream units, thereby enhancing overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If downstream electrochemical reaction units are positioned adjacent to heat-absorbing members, then heat absorption from the stack is improved, but the temperature of downstream units decreases leading to poor electrochemical reaction performance
Solution Approach 1:
The patent applies local quality by creating different thermal environments for different regions of the stack. Upstream units are positioned in high-temperature zones away from heat-absorbing members, while downstream units are strategically positioned adjacent to heat-absorbing members. This spatial differentiation allows each region to operate under optimal thermal conditions for its specific function, resolving the contradiction between heat absorption and reaction performance.
Solution Approach 2:
The patent inverts the conventional arrangement by positioning upstream units (with higher hydrogen concentration) away from heat-absorbing members and downstream units (with lower hydrogen concentration) adjacent to them. This inversion allows the downstream units to benefit from heat absorption without suffering performance degradation, as the lower hydrogen concentration units are less sensitive to temperature variations.
2Productivity
If hydrogen concentration in downstream units is reduced to increase fuel utilization rate, then fuel efficiency is improved, but electrochemical reaction performance deteriorates due to lower temperature and hydrogen concentration
Solution Approach 1:
The patent creates local quality differences by maintaining high hydrogen concentration in upstream units and low hydrogen concentration in downstream units. This gradient allows the stack to achieve high overall fuel utilization while each local region operates under optimal conditions for its specific hydrogen concentration level.
Solution Approach 2:
The patent changes the hydrogen concentration parameter along the flow direction, creating a gradient from high to low concentration. Combined with strategic positioning relative to heat-absorbing members, this parameter change allows the system to maintain high fuel utilization while preventing performance deterioration in downstream units.
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
This configuration effectively suppresses the deterioration of electrochemical reaction performance in downstream units and the entire stack by maintaining higher heat generation in upstream units, thus improving the overall efficiency and stability of the stack.
Implementation Method 1
the amount of heat generated in each upstream electrochemical reaction unit is larger than that of heat generated in each downstream electrochemical reaction unit
Implementation Method 2
the downstream electricity generation unit is adjacent to a heat-absorbing member, which absorbs heat from the electricity generation unit
Data Source
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AI summary
An object is to prevent deterioration of the electrochemical reaction performance of an electrochemical reaction block as a whole. An electrochemical reaction cell stack includes an electrochemical reaction block including three or more electrochemical reaction units arranged in a first direction; a first heat-absorbing member which is disposed on one side of the electrochemical reaction block in the first direction and absorbs heat generated from the electrochemical reaction block; and a second heat-absorbing member which is disposed on the other side of the electrochemical reaction block in the first direction and absorbs heat generated from the electrochemical reaction block. An upstream electrochemical reaction unit is disposed between the first heat-absorbing member and the downstream electrochemical reaction unit disposed closest to the first heat-absorbing member, and an upstream electrochemical reaction unit is disposed between the second heat-absorbing member and the downstream electrochemical reaction unit disposed closest to the second heat-absorbing member.