Flexible Secondary Battery Cell Structure with Folded Lead Tabs
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Solution Overview
Problem
Secondary batteries without flexibility face stress concentration issues when used in flexible electronic devices, leading to potential electrode cutoff or short-circuiting, which degrades their durability.
Innovation Solution
A flexible cell structure for secondary batteries is designed with an electrode assembly, electrode tabs, and lead tabs that are folded and inserted into each other, along with a fixing unit to secure the lead tabs, enhancing the battery's ability to absorb stress and maintain contact with the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a secondary battery with a rigid structure is used, then manufacturing and assembly are simplified, but stress concentration occurs during bending leading to electrode cutoff or short-circuiting
Solution Approach 1:
The battery structure is divided into modular components: electrode assembly, separate tab structure, and exterior housing. The tabs are further segmented into electrode tabs and lead tabs that can be independently positioned and secured, allowing the structure to flex without compromising electrical connections.
Solution Approach 2:
The electrode tabs are inserted into the lead tabs, creating a nested configuration where the smaller electrode tabs are housed within the larger lead tabs. This nested structure provides mechanical protection and maintains electrical connectivity while allowing the battery to withstand bending stresses.
2Reliability
If the battery structure is made flexible to withstand bending, then bending durability is improved, but the complexity of securing electrical connections increases
Solution Approach 1:
The tab structure is designed to be dynamic rather than rigid, allowing the lead tabs to move and flex with the battery during bending. The fixing units secure the tabs in position while permitting controlled movement, and the nested configuration allows the tabs to maintain contact despite structural deformation.
Data Source
AI summary
A cell structure for a secondary battery includes an electrode assembly including a plurality of electrodes, a plurality of electrode tabs extending from the electrodes to an outside of the electrode assembly, and a plurality of lead tabs electrically connected to the electrode tabs and contacting the electrode assembly. In the cell structure, a part of each of the lead tabs is folded, and the electrode tabs are inserted into the folded part of each of the lead tabs.