Lithium Battery Reference Electrode Plated on Neutral Metal Can Interior
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Solution Overview
Problem
Conventional methods for installing reference electrodes in lithium ion batteries are costly, complex, and can damage existing batteries, while also reducing capacity and efficiency, as they require breaching the sealed can and using unstable non-polarizable materials.
Innovation Solution
A method of electroplating a lithium reference electrode on the interior surface of a neutral metal can within the battery, allowing for retrofitting or manufacturing without breaching the seal, using less than 1% of the battery's lithium content, which is stable and non-polarizable, enabling accurate state-of-health monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to install reference electrodes during manufacture, then reference electrode functionality is achieved, but manufacturing cost and complexity increase due to additional ports and sealing requirements
Solution Approach 1:
The reference electrode is merged with the existing metal can structure of the battery. The metal can serves dual purposes as both the battery housing and the reference electrode substrate, eliminating the need for separate reference electrode components and their associated ports and sealing mechanisms.
Solution Approach 2:
The metal can is given multiple functions: it serves as the battery housing, structural support, and reference electrode. This multi-functionality eliminates the need for dedicated reference electrode installation infrastructure, reducing manufacturing complexity.
2Reliability
If conventional methods are used to install reference electrodes during manufacture, then reference electrode functionality is achieved, but battery capacity is reduced due to volume consumed by reference electrode components
Solution Approach 1:
The reference electrode functionality is combined with the existing metal can structure, eliminating the need for separate reference electrode components that would consume valuable battery volume. The reference electrode is formed in-situ on the can interior surface.
Solution Approach 2:
The metal can serves its own additional function as the reference electrode substrate. The existing structural component provides the foundation for reference electrode formation without requiring additional space or materials beyond what is already present in the battery design.
3Adaptability or versatility
If retrofitting is performed by breaching the sealed can, then reference electrode installation is achieved, but battery components are damaged leading to premature failure
Solution Approach 1:
The existing sealed battery structure serves as the installation environment for the reference electrode. The metal can interior surface is used directly as the substrate for reference electrode formation, eliminating the need to breach the seal or access the interior through port modifications.
Solution Approach 2:
The mechanical process of breaching the can and physically installing components is replaced with an electrochemical process. Reference electrode material is deposited onto the can interior surface through electroplating or electroless plating, forming the reference electrode in-situ without mechanical intervention that could damage components.
4Ease of manufacture
If aluminum, titanium, copper, or stainless steel cans are used as reference electrodes, then reference electrode functionality is achieved, but measurement accuracy is insufficient due to polarizable characteristics
Solution Approach 1:
The reference electrode is formed as a composite structure with a metal can substrate and a plated coating layer (such as lithium, silver, or other suitable materials). This composite structure combines the mechanical strength of the metal can with the electrochemical stability and non-polarizable characteristics of the plated material.
Solution Approach 2:
The electrochemical parameters of the reference electrode are optimized by selecting and plating appropriate materials on the can interior surface. The plated layer changes the electrode's electrochemical characteristics from polarizable to non-polarizable, enabling accurate potential measurements while maintaining manufacturing simplicity.
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 reduces manufacturing costs, maintains battery capacity, and provides a stable, non-polarizable reference electrode for accurate state-of-health monitoring without breaching the battery seal, enhancing monitoring capabilities and efficiency.
Implementation Method 1
plating a reference electrode on an interior surface of the can by electrically connecting the neutral metal can to the negative electrode, wherein a neutral metal can potential is greater than a negative electrode potential
Data Source
AI summary
A method of manufacturing a reference electrode for a lithium ion battery comprises charging the battery to a threshold state-of-charge, wherein the battery includes a neutral metal can and a negative electrode, and plating a reference electrode on an interior surface of the neutral metal can by electrically connecting the neutral metal can to the negative electrode, a neutral metal can potential being greater than a negative electrode potential.