Electrochemical Cell Sealing Layout for Gas Release During Charging
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Solution Overview
Problem
Existing electrochemical cell manufacturing methods fail to effectively manage gas release during charge and discharge cycles, leading to reduced efficiency and capacity due to gas accumulation between electrodes and separators.
Innovation Solution
A method involving the stacking of a positive electrode structure, a separator, and a negative electrode structure, with specific films and current collectors, and sealing the unit cell while leaving non-sealing regions to allow gas release, and pressurizing during charging to precharge and release gases generated by the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the unit cell is completely sealed to maintain structural integrity and prevent leakage, then reliability is improved, but gas accumulation between electrodes occurs leading to reduced efficiency and capacity
Solution Approach 1:
The sealing structure is segmented into two parts: a sealed peripheral portion and a non-sealed gas discharge portion. This segmentation allows the cell to simultaneously maintain structural integrity through sealing while providing dedicated pathways for gas escape, preventing gas accumulation between electrodes and maintaining reaction efficiency.
Solution Approach 2:
Different regions of the cell have different sealing properties: the periphery is sealed for structural integrity, while specific local regions (gas discharge portions) remain non-sealed to allow gas escape. This local differentiation resolves the contradiction by applying sealing only where structurally necessary while leaving other areas open for gas management.
2Loss of energy
If gas discharge holes are provided in the package to allow gas escape, then gas accumulation is prevented improving efficiency, but the package structure becomes more complex and may compromise sealing reliability
Solution Approach 1:
The gas discharge function is merged with the electrode structure itself rather than being a separate package feature. The gas discharge portions are formed as integral parts of the electrode assembly, combining the structural and gas management functions into a unified design, thereby reducing overall package complexity while maintaining gas escape capability.
Solution Approach 2:
The electrode structure provides its own gas discharge functionality through integrated gas discharge portions, eliminating the need for separate external gas management components. This self-service approach reduces package structure complexity while effectively preventing gas accumulation.
3Use of energy by moving object
If pressure is applied during charging to improve electrode contact and reaction efficiency, then energy utilization is improved, but gas generation increases leading to potential leakage and capacity loss
Solution Approach 1:
The gas generation, which is normally a harmful byproduct of charging, is converted into a beneficial feature. The gas discharge portions are designed to actively manage and utilize the generated gas, preventing it from becoming harmful while allowing continued application of pressure during charging to maintain good electrode contact and high energy utilization.
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 enhances gas release, maintains reaction efficiency, and prevents capacity loss by allowing generated gases to escape, thereby improving the overall performance of the electrochemical cell.
Implementation Method 1
an electrochemical cell includes a positive electrode structure, a negative electrode structure, and a separator
Implementation Method 2
a package having a hole for releasing a gas that can be generated in electrodes
Data Source
AI summary
A method for manufacturing an electrochemical cell includes: a process A of manufacturing a first structure by stacking a first film, a first current collector, and a first electrode; a process B of manufacturing a second structure by stacking a second film, a second current collector, and a second electrode; a process C of disposing a separator between the first structure and the second structure; a process D of manufacturing a unit cell by sealing an outer periphery of the first film and an outer periphery of the second film; and a process E of charging the unit cell while pressurizing the unit cell in a stacking direction of the first structure, the separator, and the second structure.