Elastic Bipolar Plate Structure for Fuel Cell Stack Compression
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Solution Overview
Problem
Existing bipolar plates in fuel cells face constraints due to the need for precise matching of half-plates, leading to reduced design flexibility and issues with compression springs causing uneven stack compaction and potential damage, while also requiring additional components like compression springs and clamping devices.
Innovation Solution
The use of elastic structural elements between the anode and cathode plates, made of materials like conductive polymers or carbon-based materials, which act as embedded springs to optimize compression and structural robustness, eliminating the need for compression springs and allowing for reduced stacking height and weight savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flow field plates with grooves are used, then water removal is achieved, but manufacturing precision deteriorates due to difficult groove formation and sealing issues
Solution Approach 1:
The flow field plate is divided into multiple platelets stacked together. Each platelet has simplified structures with protrusions and recesses that form flow channels when stacked, eliminating the need for complex groove machining on single plates while maintaining water removal capability through the segmented architecture.
Solution Approach 2:
The invention transitions from two-dimensional groove patterns on flat plates to three-dimensional stacked platelet structures. Flow channels are formed by the interaction of protrusions and recesses across multiple stacking layers, adding a vertical dimension that simplifies manufacturing while preserving fluid distribution and water removal functions.
2Temperature
If cooling channels are added to flow field plates, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The stacked platelet structure serves multiple functions simultaneously: it creates flow channels for reactant distribution, provides cooling channels for heat dissipation, and enables water removal. The same three-dimensional protrusion-recess architecture that forms flow channels also defines cooling pathways, eliminating the need for separate cooling structures.
Solution Approach 2:
The invention merges the flow channel function and cooling channel function into a single integrated stacked platelet structure. Cooling channels are formed by the same stacking mechanism that creates flow channels, combining thermal management and fluid distribution into one unified structure rather than separate components.
3Reliability
If sealing structures are added to prevent leakage, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The sealing function is achieved through the self-complementary geometry of the stacked platelets. The protrusions of one platelet fit into the recesses of adjacent platelets, creating inherent mechanical interlocking and sealing without requiring additional sealing components. The structure seals itself through its own geometric configuration during assembly.
Solution Approach 2:
The sealing structure is merged with the flow channel structure itself. The same protrusions and recesses that define the flow pathways also provide the sealing mechanism, eliminating the need for separate sealing elements and simplifying manufacturing while ensuring leakage prevention.
Data Source
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AI summary
The invention relates to a flow field plate for a fuel cell, which has an anode plate (30) with an anode side (31) and a coolant side (32), a first structure (33) being formed on the anode side (31) to form an anode flow field (34), and a cathode plate (40) with a cathode side (41) and a coolant side (42), a second structure (43) being formed on the cathode side (41) to form a cathode flow field (44), wherein structure elements (51) are arranged between the anode plate (30) and the cathode plate (40) to form a coolant flow field (50), said structure elements being in contact with the coolant sides (32, 42) of the anode plate (30) and the cathode plate (40). Said flow field plate has an optimised pressure distribution in a fuel cell stack (100) and greater stability than the prior art because, according to the invention, the structural elements consist of an elastic material. The invention further relates to a fuel cell stack and a vehicle.