Cell Post Riveting Structure for Smooth Busbar Terminal Fit
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Solution Overview
Problem
The busbar and external terminal in batteries fail to achieve a tight fit due to weld protrusions from the post, leading to poor current stability and assembly inefficiencies.
Innovation Solution
A riveting structure for cell posts is introduced, where the post is fixed to the inner surface of the external terminal and penetrates through a through-hole to be riveted to the current collector, avoiding weld protrusions and enabling a smoother fit with the busbar, with saw-toothed protrusions on the step surface enhancing connection strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the post is welded to the outer surface of the external terminal, then the post is securely connected to the external terminal, but weld protrusions are generated that prevent tight fit between the busbar and external terminal
Solution Approach 1:
Instead of welding the post to the outer surface of the external terminal (conventional approach), the patent inverts the approach by having the post pass through the external terminal and being riveted to the current collector from the inner side. This reversal eliminates weld protrusions on the outer surface, enabling tight fit between the busbar and external terminal while maintaining secure connection strength.
Solution Approach 2:
The patent extracts the welding operation from the outer surface of the external terminal and relocates it to the inner side where it does not interfere with the busbar fit. The weld protrusion is effectively removed from the critical fitting area, allowing the busbar and external terminal to achieve tight fit while the post remains securely connected through the riveting structure.
2Ease of operation
If space for the post is reserved on the external terminal, then the post can be installed, but weld protrusions still prevent tight fit between busbar and external terminal
Solution Approach 1:
The patent inverts the conventional post installation approach by having the post pass through the external terminal rather than being welded to the outer surface. This allows space reservation for the post while eliminating weld protrusions that prevent tight fit, thus maintaining ease of installation while improving fit precision.
3Productivity
If the post is welded to the outer surface of the external terminal, then the connection is established quickly, but the height and size of weld protrusion cannot be controlled
Solution Approach 1:
The patent extracts the welding operation from the outer surface to the inner side of the external terminal. This allows quick connection establishment through the riveting process while eliminating the uncontrollable weld protrusion issue, as the welding now occurs in a location where dimensional control is not critical for the busbar fit.
Data Source
AI summary
Disclosed is a riveting structure for cell posts. A cell comprises a lower shell, an external terminal and a current collector, the external terminal is arranged on an outer side of the lower shell, and the current collector is arranged on an inner side of the lower shell; and the external terminal has an inner surface facing the lower shell and an outer surface backing on to the lower shell. In the invention, the post is fixed to the inner surface of the external terminal and then penetrates through the first through-hole in the lower shell to be riveted to the current collector. In this way, a weld protrusion generated by welding the post to the outer surface of the external terminal is avoided, and the outer surface of the external terminal is smoother and can be in tighter fit with the busbar, thus improving the current stability.