Electrode Tab Coupling Structure for Secondary Battery
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Solution Overview
Problem
The existing methods for connecting electrode tabs in large-capacity secondary batteries, such as ultrasonic welding and riveting, face challenges in achieving a suitable fastening force and operational efficiency due to the complexity and time required for these processes.
Innovation Solution
A coupling structure for electrode tabs that uses a frame-like coupling member to surround and connect the tabs without separate processing, providing a high fastening force and simplifying the coupling operation by eliminating the need for individual through-holes and welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultrasonic welding method is used to connect electrode tabs, then the connection is achieved, but the fastening force is insufficient and welding time is long for large-capacity batteries
Solution Approach 1:
The patent replaces the ultrasonic welding method (thermal-mechanical process) with a mechanical pressing and positioning system. The pressing member applies mechanical force to press the electrode tabs against the coupling member, while the positioning member ensures proper alignment, eliminating the need for time-consuming welding operations while providing sufficient fastening force through mechanical constraint.
Solution Approach 2:
The patent introduces a coupling member as an intermediary component between the electrode tabs. This coupling member features a through-hole that receives the positioning member, creating a mediator structure that mechanically binds multiple electrode tabs together without requiring direct welding between them, thus reducing welding time while maintaining connection strength.
2Strength
If riveting connection method is used to connect electrode tabs, then fastening force is improved, but the operation becomes inconvenient and operational time increases due to individual through-hole formation
Solution Approach 1:
The patent merges the functions of multiple individual through-hole formations into a single through-hole in the coupling member. Instead of forming separate through-holes in each electrode tab as required by traditional riveting, the coupling member has one through-hole that accommodates a single positioning member, which simultaneously aligns and binds multiple electrode tabs, greatly simplifying the operation.
Solution Approach 2:
The coupling member serves multiple functions: it provides mechanical support, creates a single positioning through-hole for alignment, and binds multiple electrode tabs together. The positioning member inserted through this single hole performs the alignment function for all tabs simultaneously, making the system universal and efficient for connecting multiple tabs without repeated operations.
3Reliability
If traditional connection methods are used, then electrode tabs can be connected, but the process complexity and operational time are increased
Solution Approach 1:
The patent segments the connection system into distinct functional components: a coupling member with a through-hole for positioning, a positioning member for alignment, and a pressing member for securing. This segmentation allows each component to perform its specific function independently, simplifying the overall process while ensuring reliable connection through coordinated action of these modular elements.
Data Source
AI summary
A coupling structure for electrode tabs of a stacked-type secondary battery and a secondary battery using the same are disclosed. A coupling structure for electrode tabs of a secondary battery comprises: an electrode assembly formed by stacking a plurality of electrode plates; a tab portion formed by stacking electrode tabs protruding from one side of the electrode plates of the electrode assembly; and a coupling member that surrounds an outer surface of the tab portion so that the electrode tabs of the tab portion are connected to one another.