Wafer Alkaline Cell Laminar Sealing and Leakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional alkaline electrochemical cells face challenges in achieving a thin, laminar design suitable for small electronic devices, particularly in maintaining a tight seal and preventing electrolyte leakage, especially as the cell thickness decreases below 6 mm.
Innovation Solution
A wafer alkaline cell design featuring a laminar construction with a sealed interface using a structural adhesive and a novel over-wrap design, incorporating a sealing metal precoated on the anode current collector to enhance bonding and reduce leakage paths, along with a separator layer between the anode and cathode assemblies to prevent electrolyte migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cell thickness is reduced to create thin, laminar cells for small electronic devices, then the cell can be used in smaller devices with limited space, but the sealing reliability deteriorates and electrolyte leakage increases
Solution Approach 1:
The sealing metal is precoated onto the anode current collector before assembly, creating a protective barrier in advance. This preliminary action ensures that when the cell is assembled with reduced thickness, the sealing interface is already protected against electrolyte penetration, preventing leakage without requiring thicker walls
Solution Approach 2:
The sealing metal acts as an intermediary layer between the anode current collector and the electrolyte. This intermediate barrier prevents direct contact between the electrolyte and the current collector, blocking the leakage path while allowing the cell to maintain thin dimensions. The sealing metal effectively mediates the interaction between conductive and corrosive elements
2Length of moving object
If the cell thickness is reduced below 6 mm, then the cell becomes suitable for thin electronic devices, but the difficulty of fabrication and filling increases
Solution Approach 1:
The cell is divided into separate anode and cathode assemblies that can be independently fabricated and then bonded together. This segmentation allows each assembly to be manufactured with standard thicknesses and filling procedures, while the final laminar cell achieves reduced overall thickness through the bonding process, avoiding the difficulties of fabricating and filling a single thin structure
3Length of moving object
If a laminar construction is used to achieve thin cell profiles, then the cell can be used in small electronic devices, but the structural integrity and seal tightness deteriorate
Solution Approach 1:
The anode assembly and cathode assembly are bonded together using a structural adhesive that creates a composite laminar structure. This composite construction distributes mechanical stresses across multiple layers and bonding interfaces, maintaining structural integrity despite the reduced overall thickness. The adhesive bonding creates a unified structure that resists delamination and maintains seal tightness
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 allows for the creation of thin, durable alkaline cells with reduced electrolyte leakage, capable of functioning as both primary and secondary power sources in small electronic devices, maintaining structural integrity and electrical performance across various shapes and sizes.
Implementation Method 1
the anode or cathode current collector is precoated with a sealing metal forming an alkaline resistant metal oxide film to improve bonding
Implementation Method 2
a separator layer between the anode and cathode assemblies to prevent electrolyte migration
Data Source
AI summary
A wafer alkaline cell of a laminar structure is disclosed. The cell has a pair of opposing sides comprising at least the majority of the boundary surface of said cell and defining a short cell dimension therebetween. The cell comprises an anode assembly and a cathode assembly bonded together to form a laminate structure. The cell comprises a single plastic frame or two separate plastic frames housing the anode and cathode material. The anode current collector may be precoated with a sealing metal forming an alkaline resistant metal oxide film to improve bonding to the frame. The anode assembly has an anode material therein typically comprising zinc and the cathode assembly has a cathode material therein typically comprising manganese dioxide. The cell is durable and preferably rigid, has elongated leak block paths, and resists electrolyte leakage.