Insulating Packing Tape for Coin Cell Electrode Securing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing coin cell designs with stacked electrodes face challenges such as increased risk of electrolyte leakage, requirement for multiple polymer types for packing tape and insulation foil, and complex manufacturing processes due to the need for precise placement and avoidance of short circuits.
Innovation Solution
A coin cell design utilizing an insulating packing tape with an integral adhesive flap that secures the electrode stack between the electrodes and the case, reducing the risk of short circuits and leakage, and simplifying the manufacturing process by using a single multi-functional tape for both packing and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate packing tape and insulation foil are used, then electrical insulation and electrode securing are achieved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines the packing tape and insulation foil into a single integrated insulating packing tape structure. This tape has an insulator basis that provides electrical insulation between the electrode assembly and case, and packing flaps that secure the electrode stack. By merging two separate components into one, the patent reduces device complexity while maintaining both electrical insulation and securing functions.
Solution Approach 2:
The insulating packing tape performs multiple functions simultaneously: it provides electrical insulation (insulator basis), secures the electrode stack (packing flaps), and prevents electrolyte leakage. This multi-functional design eliminates the need for separate packing tape and insulation foil, reducing the number of components while achieving all necessary functions.
2Ease of manufacture
If separate packing tape and insulation foil are used, then electrode securing and insulation are achieved, but manufacturing process complexity increases
Solution Approach 1:
By combining packing and insulation functions into a single insulating packing tape, the patent reduces the number of assembly steps. The integrated structure can be applied in one operation rather than requiring separate application of packing tape and insulation foil, thereby simplifying the manufacturing process while improving ease of manufacture.
Solution Approach 2:
The insulating packing tape is designed with the insulator basis and packing flaps integrated beforehand. This preliminary integration means that during manufacturing, the operator only needs to apply the complete insulating packing tape structure in one step, rather than performing multiple sequential operations to apply separate components, thus simplifying the manufacturing process.
3Reliability
If insulation foil is placed under the gasket, then electrical insulation is provided, but electrolyte leakage risk increases
Solution Approach 1:
The patent changes the spatial arrangement by extending the insulating packing tape vertically along the electrode stack height with packing flaps that wrap around the electrodes. This vertical/dimensional extension creates a three-dimensional sealing structure that prevents electrolyte leakage pathways while maintaining electrical insulation, rather than using a simple planar foil under the gasket.
Solution Approach 2:
The insulating packing tape with its wrapping packing flaps creates a protective barrier around the electrode stack before the gasket is installed. This preliminary insulation and sealing structure prevents electrolyte from reaching the gasket interface, thereby preventing leakage before it can occur.
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
The design enhances manufacturing efficiency and reduces complexity by using a single insulating packing tape to secure and isolate the electrode stack, providing improved anti-leakage protection and reducing the number of components needed.
Implementation Method 1
at least the packing flap may comprise an adhesive layer facing the assembly of stacked electrodes
Data Source
AI summary
The invention relates to a coin cell (200) comprising two cases (201, 208) designed to form a housing, an assembly of stacked electrodes placed inside the housing and comprising at least one positive electrode (203), at least one negative electrode (204, 204′, 204″), and at least one separator (202) placed in-between them. It further comprises a insulating packing tape (205) comprising an insulator basis (205a) and at least one packing flap (205b) integral with the insulator basis (205a), said insulating packing tape (205) being placed in such a way that the insulator basis (205a) is between the assembly of stacked electrodes and one of the cases (208) to avoid electrical contact between the assembly of stacked electrodes and said case (208) and the packing flap (205b) holds the assembly of stacked electrodes to form an electrode pack (209).The invention relates also to a method for producing such a coin cell (200), comprising the step of:stacking together alternatively a positive electrode (203) and a negative electrode (204′, 204, 204″) by placing a separator (202) in-between them to form an assembly of stacked electrodes,packing the assembly of stacked electrodes with said insulating packing tape (205),filling said obtained assembly of stacked electrodes with electrolyte,placing the obtained assembly of stacked electrodes in the cases (201, 208),assembling the cases (201, 208).