Battery Cell Dummy Tab Layout for Short-Circuit Prevention

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Solution Overview

Problem

Secondary batteries are prone to short circuits, which can lead to accidents such as overcurrent, overheating, and fire due to the proximity of first and second electrodes.

Innovation Solution

A battery design featuring electrode tabs and dummy tabs that protrude outwardly from the cell, with the dummy tabs extending parallel to the electrode tabs and positioned at different heights to prevent short circuits by providing a barrier against external conductors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrode tabs are exposed on the cell surface for electrical connection, then electrical connectivity is improved, but the risk of short circuit between first and second electrodes increases

Engineering Contradiction:

Improveelectrical connectivityVSAvoidshort circuit risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a dummy tab as an intermediary element between the external environment and the electrode tabs. This dummy tab protrudes further than the electrode tabs and acts as a sacrificial contact point, preventing direct contact between external conductors and the electrode tabs, thereby eliminating short circuit risk while maintaining electrical connectivity through the electrode tabs.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If electrode tabs protrude from the cell for external connection, then ease of connection is improved, but the distance to external conductors is reduced increasing short circuit risk

Engineering Contradiction:

Improveconnection easeVSAvoidshort circuit risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The dummy tab serves as a mediator that extends the protrusion distance without compromising the connection ease of the electrode tabs. External conductors will contact the dummy tab first due to its greater protrusion, preventing short circuits while the electrode tabs remain easily accessible for their intended electrical connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If dummy tabs are added to prevent short circuits, then safety is improved, but device complexity increases

Engineering Contradiction:

ImprovesafetyVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dummy tab is designed as a simple, inexpensive, and easily manufacturable component that protrudes beyond the electrode tabs. It serves as a sacrificial element that prevents short circuits without requiring complex mechanisms, control systems, or expensive materials. The dummy tab can be a simple insulating or non-conductive protrusion that is straightforward to integrate into the cell structure.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS12620681B2Battery

Publication Date: 2026.05.05 SAMSUNG SDI CO LTD

AI summary

A battery includes a cell including an electrode, an electrode tab connected to the electrode, and a dummy tab protruding outwardly from the cell farther than the electrode tab. The dummy tab prevents a short circuit between first and second electrodes of the cell to prevent an accident, such as an overcurrent, overheating, and fire.