Button Cell Insulation Structure for Deformation-Induced Short Prevention
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Solution Overview
Problem
Existing button-type secondary batteries face issues with insulation tapes that fail to prevent electrode tabs from being exposed during deformation, leading to short circuits.
Innovation Solution
The battery design incorporates first and second insulation parts with insulators covering the electrode tabs' coupling surfaces and extending to the outer and inner circumferential surfaces of the electrode assembly, along with an insulation plate between the assembly and the top cap, to prevent exposure and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating tape is attached to electrode tabs, then insulation is provided, but the electrode tab becomes exposed outside the insulating tape when the electrode assembly is pressed and deformed, resulting in short circuit
Solution Approach 1:
The insulating tape is divided into multiple segments: a first insulating tape portion covering the first electrode tab, a second insulating tape portion covering the second electrode tab, and a third insulating tape portion connecting them. This segmentation allows each portion to independently maintain insulation coverage even when the electrode assembly deforms, preventing any single point of failure from exposing electrode tabs.
Solution Approach 2:
The insulating structure extends beyond the two-dimensional surface of the electrode tabs by adding a third dimension through the connecting portion that bridges between tabs. This creates a three-dimensional insulating barrier that maintains coverage during compression and deformation, preventing electrode tab exposure from multiple angles and directions.
2Quantity of substance
If the electrode assembly is compressed to increase energy density, then space utilization improves, but the insulating tape cannot maintain full coverage of electrode tabs
Solution Approach 1:
The insulating tape structure is designed to be dynamic rather than rigid, allowing it to deform with the electrode assembly during compression. The multiple portions and connecting segments can flex and adjust their positions while maintaining continuous insulation coverage, ensuring that electrode tabs remain covered even under compressed conditions that increase energy density.
Data Source
AI summary
A button-type secondary battery includes an electrode assembly having a first electrode with a first electrode tab and a second electrode with a second electrode tab; a can accommodating the electrode assembly and to which the first electrode tab is connected; a top cap coupled to an opening of the can and to which the second electrode tab is connected; and a first insulation member insulating the first electrode tab. The first electrode tab includes a first coupling surface coupled to the first electrode and a second coupling surface extending from the first coupling surface and coupled to the can. The first insulation member includes a first insulator attached to an outer circumferential surface of the electrode assembly to cover the first coupling surface, and a second insulator horizontally extending from an upper end of the first insulator toward a top surface of the electrode assembly.