Button Cell Can-Gasket Groove Layout for Stable Sealing
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Solution Overview
Problem
Button-type secondary batteries face issues with either high fitting force damaging the gasket or low coupling force due to weak adhesion between the lower and upper cans, leading to compromised sealing.
Innovation Solution
The design incorporates recessed lower and upper insertion grooves in the cans, spaced apart to accommodate a gasket protrusion, increasing contact area and adhesion through clamping, with additional grooves and protrusions enhancing stability and coupling force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a button-type secondary battery has a large electrode plate and large electrode active substance particles to increase capacity, then the battery capacity increases, but the charge-discharge rate decreases due to increased internal resistance
Solution Approach 1:
The electrode active substance particles are divided into smaller sizes (average particle size of 5 μm to 50 μm) to reduce internal resistance and improve charge-discharge rate while maintaining capacity. The current collector is also divided into a three-dimensional mesh structure to increase surface area and improve electron transport.
Solution Approach 2:
The current collector is transformed from a traditional flat two-dimensional structure to a three-dimensional mesh structure. This dimensional change increases the effective surface area for electrode deposition, improves electrolyte penetration, and enhances electron transport pathways, thereby improving charge-discharge rate without sacrificing capacity.
2Speed
If the battery uses a three-dimensional mesh current collector with porous coating to improve charge-discharge rate, then the charge-discharge rate increases, but the manufacturing complexity increases
Solution Approach 1:
The porous coating layer is formed through a self-organizing process where the polymer forms a continuous matrix that automatically creates porous structures during deposition. This self-organizing mechanism reduces the need for complex post-processing steps and simplifies manufacturing while maintaining the desired three-dimensional porous structure for improved charge-discharge performance.
3Reliability
If the battery uses a polymer electrolyte to improve safety and prevent leakage, then safety improves, but the electrolyte stability and shelf life are compromised due to decomposition
Solution Approach 1:
The electrolyte is formulated as a composite system combining polymer electrolyte with specific lithium salts (LiClO4, LiBF4, LiPF6) and cyclic carbonates (EC, PC). This composite approach leverages the safety benefits of polymer electrolytes while using carefully selected chemical components to enhance stability and prevent decomposition, thereby extending shelf life without sacrificing safety.
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 solution effectively prevents gasket damage and enhances the adhesion and coupling force between the lower and upper cans, ensuring stable sealing and improved battery performance.
Implementation Method 1
a positive electrode and a negative electrode each having a porous polymer coating layer formed by a slurry method
Implementation Method 2
Button-type secondary battery with improved charge-discharge rate and manufacturing method therefor
Data Source
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AI summary
The present invention relates to a button-type secondary battery, comprising: a lower can that serves as a first electrode terminal; an upper can that is coupled to and surrounds the lower can and serves as a second electrode terminal; and a gasket that is provided between the lower can and the upper can, wherein indented lower insertion grooves and indented upper insertion grooves are respectively formed on surfaces of the lower can and the upper can, to which the gasket is adhered, and the lower insertion grooves and the upper insertion grooves are located spaced apart from each other so as not to face each other.