Slotted Current Collection Pin for Higher-Current Battery Cells
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Solution Overview
Problem
Lithium thionyl chloride battery cells face issues with a small current collection area of the current collection pin, limiting discharge current and energy density.
Innovation Solution
The current collection pin features a slot body on its outer peripheral surface, increasing contact area with the positive electrode, and a positioning bracket to manage electrode expansion, enhancing current collection and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the current collection pin uses a conventional smooth cylindrical structure, then the manufacturing is simple, but the current collection area is small
Solution Approach 1:
The current collection pin's outer peripheral surface is segmented into multiple circumferential grooves that divide the surface into alternating conductive regions and insulating regions. This segmentation increases the effective current collection area by creating multiple contact zones while maintaining a manageable structural complexity through repetitive pattern elements.
Solution Approach 2:
The pin surface is given non-uniform local quality through the circumferential grooves, creating zones with different electrical conductivity and mechanical properties. The conductive regions provide enhanced current collection while the insulating regions prevent unwanted electrical contact, optimizing performance without requiring complete redesign of the entire pin structure.
2Reliability
If the positive electrode expands during battery operation, then the battery maintains good contact, but the current collection pin experiences stress concentration
Solution Approach 1:
The circumferential grooves segment the pin surface into multiple independent contact zones, distributing the stress from electrode expansion across these zones rather than concentrating it on a continuous surface. This segmentation allows localized deformation while maintaining overall structural integrity and reliable electrical contact.
Solution Approach 2:
The pin structure incorporates flexible elements that can accommodate electrode expansion through elastic deformation. The grooves create a compliant surface that can flex and adapt to changes in electrode volume and shape, maintaining reliable contact while reducing stress concentration on any single point of the pin.
Data Source
AI summary
The present disclosure provides a cover assembly and a battery cell. The battery cell includes the cover assembly. The cover assembly includes a current collection pin, a cover plate provided with a mounting hole, a pole inserted through the mounting hole and connected to the cover plate through an insulating seal, and a positioning bracket sleeved on at least one the pole and the current collection pin. The current collection pin includes a body, and a slot body is provided on an outer peripheral surface of the body. One end of the body is connected to the pole.