Composite Electrode Terminal Press-Fit Structure Without Friction Welding
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Solution Overview
Problem
The existing composite electrode terminals in lithium ion batteries, connected via friction welding, face high processing costs and are prone to faulty soldering, affecting the quality and safety performance of the batteries.
Innovation Solution
A composite electrode terminal design featuring recessed grooves and protrusions for a simple and reliable fitting method, eliminating the need for welding and ensuring stiffness, electrical conductivity, and air tightness through stamping, with materials like copper and aluminum used for the inner and outer terminals respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction welding is used to connect copper and aluminum materials in the composite electrode terminal, then the use performance and cost are optimized, but the processing cost increases and faulty soldering occurs easily
Solution Approach 1:
The patent replaces the friction welding process with a mechanical pressing connection system. The pressing device applies radial and axial forces to directly press the electrode terminal against the pole piece, eliminating the need for welding operations. This substitution resolves the contradiction by removing the complex welding process while maintaining reliable electrical connection through mechanical pressure alone.
Solution Approach 2:
The patent extracts and removes the welding operation from the electrode terminal assembly process. By eliminating the friction welding step entirely and using only pressing connection, the patent avoids the high processing costs and faulty soldering issues associated with welding, while still achieving the required electrical connection reliability.
2Reliability
If copper material is used for the negative electrode terminal, then the electrical conductivity is improved, but the cost increases
Solution Approach 1:
The patent applies local quality by using copper material specifically where high electrical conductivity is critical (at the connection interface with the pole piece), while using aluminum material for the outer electrode terminal body where cost reduction is prioritized. The pressing connection ensures optimal electrical contact at the copper interface, maintaining conductivity performance while reducing overall material costs through selective material placement.
Data Source
AI summary
Disclosed are a composite electrode terminal, a top cover and a battery, which relate to the technical field of batteries; the composite electrode terminal includes an inner electrode terminal and an outer electrode terminal; the inner electrode terminal is provided with a first fitting portion; the outer electrode terminal is provided with a second fitting portion fitting with the first fitting portion; one of the first fitting portion and the second fitting portion is a recessed groove, and the other of the first fitting portion and the second fitting portion is a protrusion; and when the first fitting portion is fitted with the second fitting portion, the circumferential edge of the protrusion is fitted with the circumferential edge of the inner wall of the recessed groove, and the end face of the protrusion is attached to the bottom of the recessed groove.