Button Cell Can Coupling Structure for Internal Gas Containment

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Button-type secondary batteries face issues with internal pressure buildup leading to disassembly and electrolyte leakage, posing risks of gas release harmful to humans and environmental contamination.

Innovation Solution

A button-type secondary battery design featuring a larger diameter than height, with a recessed beading part in the lower can and a bent upper can that couples securely, incorporating insulators and a collection space to manage internal gas and prevent leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the upper can and lower can are press-fitted to maintain battery shape, then the battery structure is compact and manufacturing is simple, but the cans separate when excessive internal pressure is generated

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidcan coupling reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The upper can end is bent into a curved shape that fits into the beading part of the lower can, creating a mechanical interlock that prevents separation under pressure while maintaining manufacturing simplicity

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The bent end of the upper can is inserted into the beading part of the lower can, creating a nested structure where one component fits within another, providing secure coupling without complex assembly

Inventive Principle:

Principle #7Nested doll (Nesting)

2Volume of moving object

If the cans are manufactured to match the size of the electrode assembly for press-fitting, then the battery structure is compact, but there is no available space for gas collection

Engineering Contradiction:

Improvebattery compactnessVSAvoidgas collection capability

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The battery internal space is segmented into functional zones: the electrode assembly occupies the central volume while the beading part and bent can structure create a dedicated gas collection space, allowing both compactness and gas management

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The beading part creates a radial dimension for gas collection by recessing inward from the can wall, utilizing the circumferential space around the electrode assembly rather than requiring additional axial length

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If a simple leak path structure is used, then manufacturing is easy, but electrolyte leakage is highly probable

Engineering Contradiction:

Improvestructural simplicityVSAvoidelectrolyte containment

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The bent can structure creates a complex, non-linear path for potential leaks, utilizing curved surfaces and multiple bends to extend the leak path length and reduce leakage probability while maintaining a relatively simple overall structure

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS12620654B2Button-type secondary battery

Publication Date: 2026.05.05 LG ENERGY SOLUTION LTD

AI summary

A button-type secondary battery includes an electrode assembly; a lower can into which the electrode assembly is disposed; and an upper can configured to cover an opening of an upper end of the lower can. A beading part recessed inward is provided in an upper portion of the lower can. An end of the upper can has a bent shape so the upper can and the lower can are coupled to each other while an end point of the end of the upper can is inserted into the beading part.