Electrochemical Cell Spacers for Flow Management
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Solution Overview
Problem
Metal-air cells face issues such as the buildup of precipitated reaction products and sluggish fuel oxidation due to increased oxidized fuel concentration, which affect fluid flow and efficiency during discharge and recharge.
Innovation Solution
An electrochemical cell design with a fuel electrode, oxidant electrode, and ionically conductive medium, featuring a cavity with spacers that create flow lanes to manage fluid flow and precipitates, and a method for manufacturing permeable electrode bodies with parallel spacers to enhance fluid distribution and electrode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If metal fuel is oxidized at the fuel electrode during discharge, then electrical energy is generated, but precipitated reaction products build up in the anode space and cathode space
Solution Approach 1:
The cell is divided into multiple flow lanes separated by spacers, creating distinct channels for ionically conductive medium flow. This segmentation prevents precipitates from accumulating in a single large space and directs flow through multiple pathways, reducing harmful buildup while maintaining power generation.
Solution Approach 2:
The patent uses fluid flow dynamics to manage precipitates by designing inlet and outlet configurations that create continuous circulation of the ionically conductive medium through the flow lanes. This hydraulic approach carries precipitated products away from electrode surfaces, preventing accumulation while maintaining electrochemical reactions.
2Duration of action of moving object
If solid particle fuel is fed to the fuel electrode, then the cell can operate continuously, but the rate of net oxidation of fuel decreases due to increased concentration of oxidized fuel near unoxidized fuel
Solution Approach 1:
The spacers create localized flow patterns within each flow lane, ensuring that the ionically conductive medium with fresh reactants is continuously delivered to specific regions of the fuel electrode. This local renewal of reactant concentration maintains high oxidation rates at the electrode surface despite continuous operation.
Solution Approach 2:
The system employs dynamic fluid flow through the flow lanes to continuously remove oxidized fuel and supply fresh ionically conductive medium to the fuel electrode. This dynamic circulation prevents the stagnation of oxidized products near unoxidized fuel, maintaining productive oxidation rates throughout continuous operation.
3Reliability
If spacers are added to create flow lanes for fluid management, then precipitate accumulation is prevented, but device complexity increases
Solution Approach 1:
The spacers serve multiple functions simultaneously: they divide the cell into flow lanes, support the fuel electrode, manage fluid distribution, and prevent precipitate accumulation. This multi-functionality reduces the need for separate components, managing complexity while improving reliability.
Solution Approach 2:
The spacer structure is integrated with the fuel electrode support system, combining flow management and structural support functions into a single component. This merging reduces the number of separate parts and assembly steps, managing device complexity while achieving reliable fluid flow management.
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
The design improves fluid distribution and prevents precipitate accumulation, leading to enhanced efficiency and energy density during both discharge and recharge, extending the cell's cycle life and capacity.
Implementation Method 1
an ionically conductive medium contacting the electrodes
Implementation Method 2
the ionically conductive medium flows into each flow lane via the at least one inlet, across the fuel electrode, and out of the flow lane via the at least one outlet
Implementation Method 3
oxidize a metal fuel at the fuel electrode and reduce an oxidant at the oxidant electrode to generate a discharge potential difference
Implementation Method 4
oxidize a metal fuel at the fuel electrode and reduce an oxidant at the oxidant electrode to generate a discharge potential difference
Implementation Method 5
reduce a reducible species of the fuel to electrodeposit the fuel on the fuel electrode
Data Source
AI summary
An electrochemical cell includes a fuel electrode configured to operate as an anode to oxidize a fuel when connected to a load. An electrode holder includes a cavity for holding the fuel electrode, at least one inlet connected to the cavity on one side of the cavity and configured to supply an ionically conductive medium to the cavity, and at least one outlet connected to the cavity on an opposite side of the cavity and configured to allow the ionically conductive medium to flow out of the cavity. A plurality of spacers extend across the fuel electrode and the cavity in a spaced relation from each other to define a plurality of flow lanes in the cavity.