Bipolar Plate with Angled Overlapping Channels for Fuel Cell Pressure Loss
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Solution Overview
Problem
Bipolar plates in fuel cells face challenges in reducing pressure loss and ensuring homogeneous pressure distribution of operating media, particularly due to the lower diffusion speed of oxygen compared to hydrogen, which limits fuel cell efficiency.
Innovation Solution
A bipolar plate design featuring a profiled anode and cathode plate with linearly extending cathode channels and overlapping anode and cathode channels at an angle between 0° and 90°, along with strategically positioned coolant channels, to promote uniform distribution and reduce pressure loss across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional bipolar plate designs with meandering profiles are used, then the structure provides gas distribution channels, but pressure loss of operating media increases and homogeneous pressure distribution deteriorates
Solution Approach 1:
The bipolar plate is divided into a profiled anode plate and a profiled cathode plate with distinct channel structures. The anode channels and cathode channels are segmented and overlap at specific angles to create optimized flow paths that reduce pressure loss while maintaining structural functionality.
Solution Approach 2:
The cathode channels extend linearly across the distributor area while anode channels overlap at angles between 0° and 90°, creating an asymmetric channel arrangement. This asymmetric design optimizes the hydraulic cross-section and reduces pressure loss compared to conventional symmetric meandering profiles.
2Productivity
If oxygen diffusion speed is increased to improve fuel cell efficiency, then the reaction rate improves, but the lower natural diffusion speed of oxygen limits performance
Solution Approach 1:
The channel geometry parameters are changed by extending cathode channels linearly and positioning anode channels at specific overlap angles. This changes the hydraulic cross-section and flow characteristics, effectively increasing oxygen transport rate despite the naturally slow diffusion speed of oxygen.
3Stability of the object's composition
If channel overlap is increased to improve pressure distribution, then homogeneous pressure distribution improves, but water discharge and clogging prevention may deteriorate
Solution Approach 1:
The overlapping channel design anticipates water accumulation by creating a geometric configuration that promotes water discharge through the angled overlap sections. The linear extension of cathode channels and angular overlap with anode channels pre-establish pathways that prevent clogging before it occurs.
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 water discharge, prevents clogging, and achieves a homogeneous pressure distribution of reactant gases and coolant, leading to reduced pressure loss and improved fuel cell efficiency.
Implementation Method 1
the bipolar plate is to be designed to implement a preferably homogeneous pressure distribution of the operating media across the surface area
Implementation Method 2
channels, which connect the operating means main ports of both distributor areas
Implementation Method 3
the hydraulic cross section of which is optimized in such a way that the pressure loss of the operating media is reduced
Implementation Method 4
the fuel, in particular hydrogen H2 or a hydrogen-containing gas mixture, is supplied to the anode, where an electrochemical oxidation takes place with the emission of electrons
Implementation Method 5
Oxygen or an oxygen-containing gas mixture is supplied to the cathode, so that a reduction of the oxygen takes place with absorption of the electrons
Implementation Method 6
Fuel cells use the chemical reaction of a fuel with oxygen to form water to generate electrical energy
Implementation Method 7
A (water-bound or water-free) transport of the protons H+ from the anode chamber into the cathode chamber takes place via the membrane, which separates the reaction chambers from one another in a gas-tight manner and electrically insulates them
Data Source
AI summary
A bipolar plate for a fuel cell, including a profiled anode plate and a profiled cathode plate each having an active region and two distributor regions with an anode gas main port for feeding and discharging fuel, a cathode gas main port for feeding and discharging oxidation agents, and a coolant main port for feeding and discharging coolant, these being arranged along a side edge. The bipolar plate includes distributor regions including at least one overlap section in which channels intersect one another in a non-fluidically connecting manner. The cathode gas main port is arranged between the anode gas main port and the coolant main port, cathode channels extend linearly from the port at least across the distributor region of the bipolar plate and, in a first overlap section, anode channels, and cathode channels intersect one another and form an angle of between 0° and 90°.