Pseudo-Reference Electrode for Battery Cell Potential Measurement
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Solution Overview
Problem
Conventional rechargeable battery cell designs face challenges in diagnosing issues due to obscured measurement of cell potential differences between anode and cathode, making it difficult to identify the source of changes or problems within the cell, especially when both electrodes drift simultaneously.
Innovation Solution
Incorporating a pseudo-reference electrode within the battery cell, electrically isolated from the anode and cathode, which is in direct contact with the electrolyte and coated with a polymeric material to facilitate hydroxide ion distribution, allowing for enhanced diagnostic information and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pseudo-reference electrode is incorporated in the battery cell, then measurement precision and diagnostic capability are improved, but device complexity increases
Solution Approach 1:
The pseudo-reference electrode is nested within the existing battery cell structure, positioned between the separator and one of the electrodes. This integration approach allows the reference electrode to be incorporated without requiring a completely new cell design, thereby improving measurement precision while minimizing the increase in device complexity.
Solution Approach 2:
The pseudo-reference electrode acts as an intermediary element that provides a stable reference potential against which the working electrode potential can be measured. This mediator enables precise diagnostic measurements of electrode potential without requiring direct measurement between anode and cathode, thus improving measurement precision while maintaining relatively simple cell architecture.
2Measurement precision
If the pseudo-reference electrode is electrically isolated from the anode and cathode, then measurement accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
The electrical isolation function is extracted as a separate design consideration - the pseudo-reference electrode is positioned and configured to be electrically isolated from the anode and cathode through the separator. This extraction of the isolation requirement into a specific positioning guideline simplifies the manufacturing process compared to requiring complex isolation structures, while still achieving the necessary measurement accuracy.
3Stability of the object's composition
If the polymeric coating is applied to the pseudo-reference electrode, then ion distribution and electrochemical stability are improved, but manufacturing precision requirements increase
Solution Approach 1:
The polymeric coating on the pseudo-reference electrode modifies the surface properties to achieve electrochemical stability and controlled ion distribution. By changing the surface parameters through coating, the system achieves improved stability and performance. The coating requirements are managed by selecting polymers that provide sufficient stability without requiring extremely precise thickness control, thus balancing manufacturing feasibility with performance requirements.
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 approach enables more precise tracking of internal processes and extended operating windows for battery cells by providing additional diagnostic capabilities and improved accuracy in measuring cell potential, allowing for longer and more efficient operation.
Implementation Method 1
The polymeric material may be configured to afford distribution of hydroxide ions across the polymeric material to contact the metal wire
Implementation Method 2
The battery cells may include a pseudo-reference electrode or a plurality of reference electrodes at least partially in contact with the electrolyte
Data Source
AI summary
Energy storage devices, battery cells, and rechargeable batteries of the present technology may include an anode and a cathode. The battery cells may include a separator positioned between the anode and the cathode. The battery cells may include an electrolyte incorporated with the anode and the cathode. The battery cells may also include a pseudo-reference electrode at least partially in contact with the electrolyte. The pseudo-reference electrode may be positioned between layers of the separator.