Battery Terminal Snap Connection to Avoid Welding Short Circuits
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Solution Overview
Problem
The existing methods for connecting battery terminals, such as laser welding or resistance welding, can lead to internal short circuits and excessive self-discharge due to metal spatter and high-temperature melts, posing safety risks and degrading electrical performance.
Innovation Solution
An internal connection structure for battery terminals that uses a snapping portion with a riveting protrusion to connect the first current collector to the battery terminal, eliminating the need for welding and preventing internal short circuits and self-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser welding or resistance welding is used to connect the current collector to the battery terminal, then electrical connection is achieved, but metal spatter and high-temperature melts are generated causing internal short circuits and safety risks
Solution Approach 1:
The patent replaces the welding process (thermal/chemical system) with a mechanical pressing system. The battery terminal is pressed against the current collector through a pressing portion that applies mechanical force, creating a reliable electrical connection without generating metal spatter or high-temperature melts. This mechanical substitution eliminates the harmful effects of welding while maintaining electrical connectivity.
Solution Approach 2:
The patent introduces a pressing portion as an intermediary component between the battery terminal and the current collector. This pressing portion serves as a mediator that transmits mechanical force to establish electrical contact, avoiding the direct thermal interaction that causes spatter and melts in traditional welding methods.
2Reliability
If welding is used to connect the current collector plate to the pole post, then electrical connection is achieved, but welding cracks may occur causing leakage during charging and discharging
Solution Approach 1:
The patent replaces the welding process with a mechanical pressing connection. The pressing portion applies continuous mechanical force to maintain electrical contact between the current collector and pole post, avoiding the thermal cycles and material heterogeneity that cause welding cracks during charging and discharging operations.
3Ease of manufacture
If a through hole is provided for connecting the current collector to the pole post, then assembly is simplified, but welding cracks and leakage risks increase
Solution Approach 1:
The patent merges the connection functions into a single integrated pressing structure. The pressing portion simultaneously achieves both the mechanical connection and electrical connection functions, eliminating the need for separate welding operations and the associated risks of welding cracks and leakage.
Data Source
AI summary
An internal connection structure of a battery terminal and a battery, the internal connection structure of the battery terminal includes a a roll core, a first current collector, and a snapping portion. The roll core is provided with a first electrode tab and a second electrode tab. The first current collector is connected to the first electrode tab, and the first current collector is provided with a hole. The snapping portion is disposed on an inner side of the battery terminal, the snapping portion is snapped through the hole, the battery terminal passes through the hole and is snapped and assembled with the first current collector through the snapping portion, and the battery terminal is configured to enable a positive end of the roll core extend outwards.