Ultra-Small Pin-Type Battery Fixing Portion for Electrode Stability
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Solution Overview
Problem
Existing rechargeable batteries lack a design for ultra-small diameters, leading to electrode assembly movement within the case due to coupling work tolerance, which is not suitable for emerging small-sized mobile devices.
Innovation Solution
A pin-type rechargeable battery design with an ultra-small diameter, featuring a fixing portion within the case to secure the electrode assembly, gaskets to seal and protrude terminals, and beading portions to enhance coupling and sealing, preventing electrode assembly movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the battery diameter is reduced to ultra-small size, then the battery can be used in small-sized mobile devices such as touch pens and stylus pens, but the electrode assembly moves inside the case due to coupling work tolerance
Solution Approach 1:
The patent applies preliminary action by providing a fixing portion that protrudes from the inner side of the case toward the electrode assembly before operation. This fixing portion preliminarily secures the electrode assembly in position, preventing movement that would otherwise occur due to coupling work tolerance in ultra-small diameter batteries. The fixing structure is pre-positioned to maintain stability from the outset.
2Stability of the object's composition
If the electrode assembly is secured tightly to prevent movement, then position stability is improved, but the device complexity increases due to additional fixing structures
Solution Approach 1:
The fixing portion serves multiple functions simultaneously: it acts as both a structural support element of the case and a positioning mechanism for the electrode assembly. By integrating the fixing function into the existing case structure rather than adding separate components, the patent achieves position stability without significantly increasing device complexity.
3Reliability
If gaskets are added to seal the openings and allow terminal protrusion, then sealing performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs gaskets as flexible sealing elements that can deform to accommodate minor variations in manufacturing tolerances. These flexible thin film structures provide reliable sealing at the openings where terminals protrude, while being tolerant of small dimensional variations, thus achieving good sealing performance without requiring extremely high manufacturing precision.
Data Source
AI summary
A rechargeable battery includes an electrode assembly having first and second electrodes at opposite sides of a separator and wound about an axis; a first terminal coupled to the first electrode through a first tab; a second terminal coupled to the second electrode through a second tab; a case accommodating the electrode assembly and including first and second openings at its opposite ends; a first gasket between the first terminal and the first opening, the first gasket sealing the first opening and allowing the first terminal to protrude outside of the case; and a second gasket between the second terminal and the second opening, the second gasket sealing the second opening and allowing the second terminal to protrude outside of the case. The case may further include a fixing portion at its inner side that protrudes toward the electrode assembly.