Secondary Battery Electrode Edge Layout for Weld Dust Insulation
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Solution Overview
Problem
In secondary battery electrode assemblies with lead-type or tab-less current collecting structures, metal bonding processes like resistance welding or laser beam welding can result in air expansion or vaporization of impurities, leading to the generation of fine metal dust that may cause internal short circuits due to winding deviations or contact between electrodes.
Innovation Solution
The electrode design includes a core member with a conductive adhesive layer, a mixture layer, and an insulating protective layer containing resin, where the protective layer is strategically positioned at exposed ends to prevent dust formation and ensure insulation, thereby preventing internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If melt bonding (resistance welding or laser beam welding) is used to bond lead wire or current collector to collector plate, then bonding strength is improved, but fine metal dust is generated causing internal short circuits
Solution Approach 1:
The patent extracts and removes the harmful fine metal dust generated during melt bonding from the battery interior using a vacuum cleaner, preventing it from causing internal short circuits while maintaining the bonding strength benefits of melt bonding
Solution Approach 2:
The patent introduces a vacuum cleaner as an intermediary device between the welding process and the battery interior, which captures and removes the harmful dust particles generated during welding, allowing the welding process to proceed with full bonding strength while preventing dust-related failures
2Ease of operation
If lead wire or current collector is exposed for welding, then current collection is improved, but winding deviation may cause contact with counter electrode leading to internal short circuit
Solution Approach 1:
The patent introduces insulating tape as an intermediary protective layer wrapped around the exposed lead wire or current collector, which maintains electrical insulation during winding and assembly operations, allowing easy current collection while preventing contact-induced short circuits
Solution Approach 2:
The patent applies insulating tape to the lead wire or current collector before the winding and assembly processes, providing preliminary protection against short circuits that may occur during subsequent manufacturing steps or due to winding deviations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses the occurrence of internal short circuits by preventing dust adherence and maintaining insulation between electrodes, even during welding and potential winding deviations.
Implementation Method 1
an adhesive layer disposed on the core member and being conductive
Implementation Method 2
a protective layer containing a resin and being insulating
Data Source
AI summary
A positive electrode, which is an example of this secondary battery electrode, includes: a positive electrode core material; an electrically conductive adhesive layer disposed on the positive electrode core material; and a positive electrode mixture layer disposed on the adhesive layer. The positive electrode core material includes, at one end in a lateral direction of the positive electrode core material, an exposed portion where the adhesive layer and the positive electrode mixture layer are not disposed. An insulating protection layer that includes resin is disposed on the exposed portion of the one end. A predetermined gap is provided between the protective layer and an end surface of one end in the lateral direction of the adhesive layer.