Button Cell Case Layout With Plastic Heat Shielding

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Solution Overview

Problem

Conventional button cells face issues with damage due to welding heat and external interference, leading to short circuits and reduced energy density per volume.

Innovation Solution

A button cell design featuring a plastic auxiliary member surrounding the electrode assembly, coupled with non-overlapping first and second cases that accommodate the assembly, preventing welding damage and external interference while enhancing energy density.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the case and cap plate are welded to accommodate the electrode assembly, then the battery structure is formed, but the welding heat damages the separator and causes short circuit

Engineering Contradiction:

Improveshort circuit preventionVSAvoidwelding heat damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a plastic auxiliary member as an intermediary component between the welding area and the electrode assembly. This member shields the separator from welding heat while allowing the case and cap plate to be welded for structural formation, thus preventing short circuit without compromising assembly integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The plastic auxiliary member is positioned and secured before the welding process occurs. This preliminary placement ensures that when welding takes place, the separator is already protected from heat damage, preventing the harmful effect before it can occur

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the case and cap plate overlap in the first direction, then the sealing is improved, but the volume efficiency and energy density are reduced

Engineering Contradiction:

Improvesealing performanceVSAvoidenergy density per volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent transitions from a traditional overlapping configuration to a non-overlapping arrangement where the first case and second case are positioned at different locations along the first direction. This dimensional reorganization maintains sealing through alternative means while optimizing volume utilization for higher energy density

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Strength

If the electrode assembly is accommodated inside the case before welding, then the assembly is protected, but the separator is damaged by welding heat

Engineering Contradiction:

Improveassembly protectionVSAvoidwelding heat exposure

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The plastic auxiliary member serves as a protective intermediary that remains with the electrode assembly during welding. It shields the separator from welding heat while allowing the case and cap plate to be securely welded, thus maintaining assembly protection without heat damage

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250316811A1Button cell

Publication Date: 2025.10.09 SAMSUNG SDI CO LTD

AI summary

A button cell includes: an electrode assembly that includes a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; a plastic auxiliary member that surrounds an edge of the electrode assembly in a first direction; a first case that is coupled to the plastic auxiliary member to cover a first end portion of the electrode assembly in a second direction crossing the first direction and is connected to the first electrode; and a second case that is coupled to the plastic auxiliary member to cover a second end portion of the electrode assembly in the second direction and is connected to the second electrode. The first case and the second case do not overlap in the first direction.