Sealed Secondary Battery Case Corrosion Testing Without Plating Damage
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Solution Overview
Problem
Existing methods for evaluating the corrosion resistance of secondary battery cases are inaccurate due to damage or peeling of the plating layer, which disrupts the initial state of the case and prevents precise electrochemical evaluation.
Innovation Solution
A characteristic measurement apparatus is developed, comprising a sealing member, washers, an auxiliary electrode, and a reference electrode, which are installed within the secondary battery case to measure corrosion characteristics without altering the case's shape, using a porous film to prevent short-circuiting and electrolyte immersion to facilitate accurate evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the case is dismantled, bent, or planarized for electrochemical evaluation, then the evaluation can be conducted, but the plating layer is damaged or peeled off, compromising measurement accuracy
Solution Approach 1:
The measurement apparatus is installed inside the case before sealing, and the case is evaluated in its initial sealed state without any dismantling, bending, or planarization. This preliminary setup allows corrosion resistance measurement while maintaining the case's structural integrity and plating layer completeness.
Solution Approach 2:
Electrodes (working electrode, reference electrode, counter electrode) are introduced as intermediaries to conduct electrochemical measurements through the sealed case without direct contact or manipulation of the case structure. The electrodes enable measurement through the electrolyte while the case remains in its original state.
2Measurement precision
If the case is evaluated in its initial sealed state, then measurement accuracy is maintained, but additional components (sealing member, electrodes, electrolyte) must be installed
Solution Approach 1:
The measurement apparatus uses standard electrochemical components (electrodes, electrolyte, sealing member) that can be applied to various types of secondary battery cases. The same basic configuration works for different case shapes and sizes, reducing overall system complexity through component standardization.
Solution Approach 2:
The measurement apparatus components are nested within the case structure: electrodes are positioned inside the case, surrounded by electrolyte, with the sealing member closing the entrance. This nested arrangement minimizes external equipment requirements and simplifies the overall measurement system.
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
Enables precise measurement of corrosion characteristics by maintaining the case's original shape and structure, allowing for accurate determination of corrosion resistance and damage assessment through Tafel plots and Nyquist plots.
Implementation Method 1
a reference electrode insulated from the auxiliary electrode and configured to be positioned between the washers
Implementation Method 2
The reference electrode may be wrapped with a porous film
Data Source
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AI summary
A characteristic measurement apparatus for a secondary battery case includes a sealing member configured to seal an entrance of a metal case for a secondary battery whose characteristics are to be measured; a pair of washers connected to the sealing member and configured to be installed facing each other in the case; an auxiliary electrode configured to be positioned between the washers; and a reference electrode insulated from the auxiliary electrode and configured to be positioned between the washers.