Perforated Battery Electrode Structure for Nail Penetration Safety
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Solution Overview
Problem
Existing secondary batteries are prone to ignition or explosion due to penetration of sharp objects, and current safety measures are inadequate in preventing quick response short circuits, with existing methods either requiring additional space or deteriorating battery performance.
Innovation Solution
Forming apertures in the thickness direction of the electrode current collector and active material layer to reduce elongation, thereby minimizing contact and short circuits when a sharp object penetrates, using a roller with perforation means during the rolling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate safety device is attached to the outside of the cell, then reliable cutoff protection is provided, but additional installation process and installation space are required
Solution Approach 1:
The safety function is merged with the electrode structure by forming an aperture directly in the electrode. This integrates the safety mechanism into the existing electrode rather than adding a separate external device, thereby providing reliable protection while eliminating additional installation processes and space requirements.
Solution Approach 2:
The electrode itself provides the safety function through the aperture design. When a sharp object penetrates the battery, the aperture allows the electrode to break and disconnect internally, enabling the electrode to protect the battery without requiring external safety devices or additional installation.
2Reliability
If a chemical safety device is added inside the cell, then no additional installation space is required, but byproducts are generated during floating film formation, deteriorating battery performance
Solution Approach 1:
The electrode is segmented by forming an aperture that divides it into multiple sections. This segmentation allows the electrode to break into separate parts when penetrated by a sharp object, creating an internal disconnect that prevents short circuits without requiring chemical additives that would generate harmful byproducts and degrade performance.
3Reliability
If the electrode material elongation is reduced to prevent short circuit, then safety against sharp object penetration is improved, but the electrode becomes more brittle and prone to breakage during normal operation
Solution Approach 1:
An aperture is preliminarily formed in the electrode during manufacturing. This pre-formed aperture creates a predetermined weak point that will break first when a sharp object penetrates the battery, preventing the rest of the electrode from breaking and causing short circuits, while maintaining the electrode's normal strength and durability during regular operation.
Data Source
AI summary
The present invention relates to an electrode for a secondary battery having improved safety, a method for manufacturing the electrode, and a secondary battery including the electrode. The secondary battery according to the present invention includes a plurality of apertures that penetrate a current collector and an electrode active material layer in a thickness direction. The electrode may improve safety by preventing or minimizing the occurrence of ignition or explosion when a sharp object such as a nail penetrates into the interior of a battery, thereby improving safety of the battery.