Button Cell Terminal Bonding With Notched Gasket for Thin Batteries
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Solution Overview
Problem
Existing button-type secondary batteries face challenges in miniaturization due to the limitations of the positive electrode terminal's thickness, which is hindered by the protruding portions of the riveting structure.
Innovation Solution
A button-type secondary battery design featuring a through-hole in the top plate, a positive electrode terminal with a protrusion and hook, and a gasket that seals and bonds the terminal to the top plate using thermal fusion or ultrasonic waves, with notches on the surfaces to increase contact area and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a riveting method is used to couple the positive electrode terminal to the top plate, then the bonding strength is improved, but the thickness of the battery increases due to protruding portions
Solution Approach 1:
The invention extracts the harmful protruding portions from the terminal structure by implementing a flush mounting design where the terminal surface is aligned with the top plate surface, eliminating the need for protruding rivet heads while maintaining bonding strength through alternative coupling methods
Solution Approach 2:
The top plate serves multiple functions: it acts as both the battery cover and the bonding surface for the terminal, integrating the terminal mounting function into the top plate structure itself, thereby eliminating the need for separate protruding bonding elements
2Length of stationary object
If the positive electrode terminal thickness is reduced to minimize battery thickness, then the battery miniaturization is improved, but the bonding reliability deteriorates
Solution Approach 1:
The invention performs preliminary surface preparation on the top plate and terminal surfaces before bonding, including surface treatment and positioning features that ensure optimal bonding conditions are established in advance, allowing thin terminals to achieve reliable bonding without protruding portions
Solution Approach 2:
The invention changes the bonding parameters by using alternative bonding methods (such as adhesive bonding or friction stir welding) that can achieve strong bonding with thinner terminal materials, transitioning from mechanical protruding bonding to surface-based bonding mechanisms
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 a thinner battery structure by eliminating the riveting process, enhancing bonding and sealing, and reducing the overall thickness while maintaining electrical insulation and corrosion resistance.
Implementation Method 1
a gasket insulating a portion at which the protrusion and the hook are in contact with the top plate when the protrusion of the positive electrode terminal is inserted into the through-hole, wherein the gasket bonds the positive electrode terminal to the top plate
Implementation Method 2
ultrasonic waves may be applied to the gasket to fuse the gasket between the positive electrode terminal and the top plate
Data Source
AI summary
A button-type secondary battery having a cup which has an opened upper side and in which an electrode assembly and an electrolyte are mounted; a top plate which is coupled to an upper end of the cup to close the opened upper side of the cup and in which a through-hole is formed; a positive electrode terminal including a protrusion having a diameter capable of being inserted into the through-hole and a hook having a diameter greater than that of the through-hole, the protrusion being inserted into the through-hole so that the hook is disposed outside or inside the cup; and a gasket inserted to insulate a portion at which the protrusion and the hook are in contact with the top plate when the protrusion of the positive electrode terminal is inserted into the through-hole. The gasket bonds the positive electrode terminal to the top plate.