Flow Battery Bipolar Plate Channel Design for Electrolyte Distribution
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Solution Overview
Problem
Flow batteries face a tradeoff between performance and pressure drop, with designs either providing poor performance with acceptable pressure drop using thick electrodes or good performance with high pressure drop and low durability due to steep concentration gradients and non-uniform diffusion.
Innovation Solution
The flow battery incorporates a bipolar plate with channel arrangements that create a pressure gradient to force liquid electrolytes into porous electrodes, combining forced convective flow with diffusion to achieve a balance between pressure drop and performance, using configurations such as interdigitated, serpentine, or tapered channels to optimize electrolyte flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thick electrodes are used, then performance is poor but pressure drop is acceptable
Solution Approach 1:
The patent changes the flow regime parameter from pure diffusion to forced convection by applying pressure gradient, enabling thin electrodes to achieve both low pressure drop and high performance simultaneously
Solution Approach 2:
The patent uses hydraulic pressure gradient to force electrolyte flow through porous electrodes, replacing passive diffusion with active convective transport to improve mass transfer efficiency
2Productivity
If forced convective flow is used to improve performance, then pressure drop increases and durability decreases
Solution Approach 1:
The patent applies local quality by creating non-uniform pressure distribution across the electrode surface, with higher pressure at inlet regions and lower pressure at outlet regions, optimizing flow distribution and reducing stress concentrations
Solution Approach 2:
The patent introduces dynamic flow control through adjustable pressure gradient, allowing optimization of flow rate and velocity profiles to balance performance enhancement with mechanical durability
3Productivity
If steep concentration gradients are created, then performance improves but non-uniform diffusion occurs
Solution Approach 1:
The patent replaces passive molecular diffusion with forced convective flow driven by pressure gradient, achieving uniform mass transport and eliminating concentration gradient-related non-uniformity while maintaining high performance
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 design allows for the use of thin electrodes with acceptable pressure drops, enhancing performance and durability by ensuring uniform diffusion and reduced parasitic loads, thereby improving the overall efficiency of the flow battery.
Implementation Method 1
channel arrangements that create a pressure gradient to force liquid electrolytes into porous electrodes
Implementation Method 2
combining forced convective flow with diffusion to achieve a balance between pressure drop and performance
Implementation Method 3
combining forced convective flow with diffusion to achieve a balance between pressure drop and performance
Implementation Method 4
an electrolyte layer, which may include separator such as an ion-exchange membrane
Data Source
Figure 1~2
Figure 3A~8
Figure 5A~7
AI summary
A flow battery includes a liquid electrolyte that has an electrochemically active specie and a bipolar plate that has channels for receiving flow of the liquid electrolyte. A porous electrode is arranged immediately adjacent the bipolar plate. The porous electrode is catalytically active with regard to the liquid electrolyte. The channels of the bipolar plate have at least one of a channel arrangement or a channel shape that is configured to positively force at least a portion of the flow of the liquid electrolyte into the porous electrode.