Bipolar Structure Sealing Evaluation via Pressure Gradient
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Solution Overview
Problem
Current methods lack a reliable and non-destructive way to test the tightness of bipolar structures in electrochemical generators, which can lead to ionic short-circuiting due to manufacturing defects, particularly during the calendering process, and are typically detected only after assembly and activation.
Innovation Solution
A method involving placing the bipolar structure in a cavity with separated compartments and circulating a fluid to measure pressure differences, allowing for the evaluation of its intrinsic permeability and integrity before assembly, using a support grid to prevent deformation and setting leakage rate criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bipolar structures are compressed during manufacturing to achieve target porosity and thickness, then electrode performance is improved, but the risk of creating micro-leaks through the current collector increases
Solution Approach 1:
The patent applies preliminary action by performing a tightness test on bipolar structures before they are integrated into the electrochemical generator assembly. This allows detection of micro-leaks created during compression while the bipolar structure is still accessible, enabling elimination of defective components before final assembly and activation.
2Device complexity
If tightness testing is performed after assembly and activation, then manufacturing complexity is reduced, but defective bipolar structures cannot be eliminated before integration
Solution Approach 1:
The patent implements preliminary testing by establishing a method to test bipolar structures before they are integrated into the generator assembly. This preliminary action allows defective structures to be identified and eliminated prior to assembly, improving operational reliability without requiring complex in-situ testing mechanisms.
3Productivity
If bipolar structures are integrated without prior tightness testing, then assembly time is reduced, but ionic short-circuiting risks increase
Solution Approach 1:
The patent applies preliminary action by performing tightness testing on bipolar structures before integration into the generator assembly. This allows defective structures to be identified and eliminated prior to assembly, preventing ionic short-circuiting risks while maintaining assembly efficiency through batch testing approaches.
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 method effectively detects leaks and ensures the integrity of bipolar structures before integration into an electrochemical generator, preventing ionic short-circuiting and enabling the elimination of defective components before assembly, thus ensuring reliable operation.
Implementation Method 1
evaluating the tightness of the bipolar structure from a measurement of the pressure difference of the fluid in the first and second compartments
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for evaluating the sealing of a bipolar structure (16) including a sheet-like substrate (14) forming a current collector, as well as two electrodes (10, 12) in the form of films arranged on the opposite surfaces of the substrate (14), respectively, the method including the following steps: placing the bipolar structure (16) in a cavity (102) so as to define first and second compartments (108a, 108b) therein, which are separated by said bipolar structure, the periphery of which is sealingly connected to the cavity (102); circulating a fluid in the first compartment (108a) of the cavity toward the second compartment (108a); and evaluating the sealing of the bipolar structure (16) from a measurement of the difference in the pressure of the fluid in the first and second compartments.