Diffuser Strip Current Collector for Molten Electrolyte Injection
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Solution Overview
Problem
The high-velocity injection of molten electrolyte into metal halide electrochemical cells disrupts the granule bed, leading to reduced charge/discharge capacity, increased cell resistance, and uneven performance among cells in arrays, resulting in early failures.
Innovation Solution
A current collector with a diffuser strip is designed to dissipate the injection stream of molten electrolyte, reducing granule bed disruption during the manufacturing process of electrochemical cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-velocity injection of molten electrolyte is used to fill the cathode portion, then filling efficiency is improved, but granule bed disruption occurs leading to reduced charge/discharge capacity and increased cell resistance
Solution Approach 1:
A diffuser member is introduced as an intermediary component between the injection source and the granule bed. The diffuser member receives the high-velocity molten electrolyte injection and redistributes it in a controlled manner, mediating between the filling requirement and the granule bed protection requirement. This allows high-velocity injection to continue while preventing direct impact on granules.
Solution Approach 2:
The high-velocity injection stream, which would normally cause harmful disruption to the granule bed, is converted into a beneficial controlled distribution process. The diffuser member transforms the harmful concentrated jet into a beneficial distributed flow pattern that fills the cathode portion effectively while protecting the granule bed structure.
2Speed
If high-velocity injection of molten electrolyte is used, then filling speed is improved, but cell resistance increases due to granule bed disturbance
Solution Approach 1:
The diffuser member serves as a mediator that decouples the injection speed from the impact velocity on granules. High-speed injection can be maintained for efficiency, while the diffuser member ensures that the actual contact with the granule bed occurs at reduced velocity, preventing resistance increase.
3Loss of time
If high-velocity injection is used, then manufacturing time is reduced, but cell-to-cell performance uniformity deteriorates
Solution Approach 1:
The diffuser member provides a consistent interface between the injection process and all granule beds in the array. By standardizing the distribution pattern through the diffuser, variability between cells is reduced while maintaining fast injection speeds, ensuring uniform performance across all cells.
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 diffuser strip minimizes granule bed disturbance, enhancing uniformity and performance consistency across electrochemical cells, thereby improving the overall energy storage device performance.
Implementation Method 1
The diffuser strip can be configured to dissipate an injection stream of molten electrolyte into the first compartment when the molten electrolyte is injected into the first compartment
Data Source
AI summary
Apparatus and methods to reduce granule disruption during manufacture of electrochemical cells, such as a metal halide electrochemical cell, are provided. In one embodiment, a current collector can include a diffuser strip extending beneath an aperture configured to receive an injection stream of molten electrolyte. The diffuser strip can be configured to dissipate an injection stream of molten electrolyte when the molten electrolyte is injected into an electrochemical cell. In this way, disruption of a granule bed by the injection of the molten electrolyte during manufacture of the electrochemical cell can be reduced.