Battery Current Collector Tab Slit Design for Welding Defect Tolerance
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Solution Overview
Problem
Conventional batteries face structural reliability issues due to welding defects between current collector tabs and terminals, which can lead to electric power isolation in electrode stacks.
Innovation Solution
The battery design incorporates current collector tabs with slits that divide their end portions, allowing these portions to be electrically connected to adjacent tabs, ensuring continuous power supply even if welding defects occur between the tabs and terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current collector tabs are solely joined to current collector terminals, then the structure is simple, but welding defects cause electric power isolation
Solution Approach 1:
The end portion of the current collector tab is divided into multiple separate portions by forming slits, transforming a single connection point into multiple independent connection points. This segmentation ensures that if one welding point fails, other portions maintain electrical connectivity.
Solution Approach 2:
The slits are formed in advance during manufacturing, creating a redundant multi-portion structure that anticipates potential welding defects. This beforehand preparation ensures that even if welding defects occur, the electrical connection is maintained through other portions.
2Reliability
If current collector tabs are divided by slits, then electrical connectivity is maintained, but manufacturing complexity increases
Solution Approach 1:
The slits are formed in the current collector tab end portion during the manufacturing process before the joining step. This preliminary action integrates the complexity into the manufacturing flow rather than adding post-processing steps, making the overall process more efficient.
Data Source
AI summary
Provided is a battery that can improve structural reliability. The battery includes: a power generating element provided with plural current collector tabs aligning in a thickness direction; and a current collector terminal connected to the current collector tabs, wherein at least one of the current collector tabs has at least one slit by which an end portion of said at least one current collector tab is divided in a width direction, and portions into which the end portion of said at least one current collector tab is divided by said at least one slit therebetween are each electrically connected to another one of the current collector tabs that are adjacent to said at least one current collector tab in the thickness direction.