Fuel Cell Stack Thermal Integration via Bipolar Plate Cooling
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Solution Overview
Problem
There is a need for a fuel cell stack that combines increased compactness with improved efficiency, thermal integration, and reduced response times to meet the requirements of electric power generation, particularly in backup power applications, while minimizing size and weight.
Innovation Solution
The fuel cell stack design incorporates a membrane electrode assembly (MEA) between gas diffusion layers and bipolar plates with integrated flow fields for reactant distribution and heat management, along with a heat exchanger module within the stack heads for efficient thermal coupling and reduced component count, enabling compact and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the stack is made more compact to reduce size and weight, then the overall dimensions and mass decrease, but thermal management becomes more difficult and efficiency may deteriorate
Solution Approach 1:
The patent integrates the cooling circuit directly within the stack structure by incorporating channels in the bipolar plates that allow coolant flow through the electrochemical cells. This merging of cooling functionality into the stack itself enables effective heat removal in a compact configuration without requiring separate external cooling components.
Solution Approach 2:
The bipolar plates serve multiple functions: they provide structural support, conduct electricity between cells, distribute reactants through flow fields, and remove heat through integrated cooling channels. This multi-functionality reduces the number of separate components needed, enabling compact design while maintaining thermal management capability.
2Volume of moving object
If auxiliary components are integrated into the stack to reduce overall size, then the generator becomes more compact, but the device complexity increases
Solution Approach 1:
The patent combines multiple auxiliary functions directly into the stack structure: cooling channels are integrated into bipolar plates, reactant distribution is handled by flow fields in the same plates, and electrical connection is provided by the conductive bipolar plates themselves. This integration eliminates separate auxiliary components while maintaining functionality.
Solution Approach 2:
The bipolar plates are designed as multi-functional components that simultaneously provide structural support, electrical conduction, reactant distribution through integrated flow fields, and thermal management through cooling channels. This universality reduces the number of separate parts needed in the generator.
3Power
If the stack operates at higher power density, then the energy output per unit volume increases, but thermal gradients and heat management challenges worsen
Solution Approach 1:
The cooling channels are designed to continuously remove heat as it is generated in the electrochemical cells. The coolant flows through channels positioned to contact the bipolar plates at multiple locations, ensuring continuous heat removal throughout the stack operation, which prevents excessive thermal gradients even at high power density.
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 enhances thermal energy conditioning, reduces startup time, minimizes thermal gradients, and increases power density while reducing harmonic emissions and ohmic losses, improving the reliability and efficiency of the electric power generator.
Implementation Method 1
stacks of fuel cells based on PEM technology (proton exchange membranes)... generate electric power using the electrochemical reaction between hydrogen and oxygen
Implementation Method 2
cooling system (comprising, in turn, a pump, pipes, dissipaters, etc.) through which a fluid passes, e.g. water, and designed to remove excess heat from the stack
Data Source
AI summary
The invention relates to a stack (200) comprising a plurality of stacked fuel cells (100), fixed and fluidically connected to a first head (210), which comprises: a feeding inlet (301) for a fuel flow and a corresponding outlet (302); a feeding inlet (303) for a comburent flow and a corresponding outlet (306); a feeding inlet (302) and a corresponding outlet (305) for a flow of a cooling heat-transfer fluid thermally coupled with the fuel cells (100) in order to remove at least part of the reaction heat at the fuel cells (100) themselves; the first head (210) comprising a feeding inlet (307) and a corresponding outlet (308) for a flow may pass, said volume being thermally coupled with the cooling heat-transfer fluid flow, so that the cooling heat-transfer fluid delivers at least some of the heat removed from the fuel sells (100) to the working heat-transfer fluid.