Molded Conductive Bipolar Plate Assembly for Complex Flow Fields
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Solution Overview
Problem
Existing flow batteries face challenges in manufacturing complex bipolar separator plates due to the complexity of producing flow fields with serpentine or other patterns, leading to high costs and poor performance.
Innovation Solution
A flow plate assembly comprising a moldable material with conductive particles, featuring channels for electrolyte communication, and frame structures that engage with the flow plate to expose a portion of its surface, along with an electrochemical stack assembly that includes electrode assemblies and flow plate assemblies arranged to maintain position and allow fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional metal or graphitic carbon/polymer composites are used for bipolar separator plates, then electrical conductivity is achieved, but manufacturing complexity and cost increase due to the need for complex flow field patterns
Solution Approach 1:
The patent changes the material parameter from traditional metals or graphitic composites to a moldable conductive material that can be directly molded into complex flow field patterns. This parameter change enables the flow fields to be formed during the molding process itself, eliminating subsequent machining or assembly steps and significantly reducing manufacturing complexity.
Solution Approach 2:
The patent employs a composite material system consisting of a moldable matrix material combined with conductive particles or filler material. This composite approach provides both the necessary electrical conductivity and the moldability required to form complex flow field patterns directly during molding, resolving the contradiction between ease of manufacture and device complexity.
2Productivity
If complex flow field patterns are molded directly into the bipolar plates, then manufacturing steps are reduced, but material selection and processing complexity increase
Solution Approach 1:
The patent modifies the material parameters to achieve optimal balance between moldability and conductivity. By selecting specific conductive particle sizes, shapes, and concentrations within the moldable matrix, the material can be processed using standard molding techniques while forming complex flow field patterns, thereby improving productivity without excessive processing complexity.
Solution Approach 2:
The patent applies local quality by concentrating conductive particles or filler material in specific regions or at specific concentrations within the moldable matrix. This localized enhancement of conductivity ensures that the molded flow field patterns achieve the necessary electrical performance while the overall material remains moldable, resolving the contradiction between manufacturing efficiency and material processing complexity.
3Device complexity
If bipolar separator plates are made with integrated flow fields, then assembly complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the bipolar plate into functional zones during molding - regions with flow field patterns and regions without. The mold design incorporates segmented cavities or inserts that define the flow field patterns, allowing precise formation of channels and manifolds while maintaining overall plate integrity. This segmentation approach reduces assembly complexity while managing manufacturing precision requirements through mold design.
Solution Approach 2:
The patent uses preliminary action by pre-forming the flow field patterns during the molding process itself, before any assembly operations. The mold cavities are designed with precise geometries that define the flow field channels, manifolds, and connection points. This preliminary formation of flow fields eliminates the need for subsequent machining or assembly of flow field components, reducing assembly complexity while the precision is controlled through mold manufacturing and process parameters.
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
Facilitates the production of efficient and reliable flow battery systems with improved manufacturing ease and reduced complexity, enhancing the performance and cost-effectiveness of large-scale energy storage solutions.
Implementation Method 1
the flow plate comprising a moldable material having a conductive material dispersed therein
Data Source
AI summary
Provided are flow plate assemblies that comprise a flow plate—such as a bipolar plate—disposed within a frame. The frame can include one or more channels or manifolds to distribute active material to channels formed in the flow plate engaged with the frame. The assemblies can themselves be assembled into an electrochemical cell stack.