Battery Terminal Rivet Structure for Gap-Free Current Collector Joining
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Solution Overview
Problem
In secondary batteries, the connection between terminals and current collectors can be unstable due to large gaps formed during riveting, which reduces the reliability of the connection.
Innovation Solution
The formation of a spot-faced hole around the current collector's through hole with a protrusion on the bottom surface and a side surface, where the terminal is inserted and riveted, ensuring contact with both surfaces and a weld connection to the edge of the hole, preventing large gaps and enhancing the connection's stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal is riveted in a spot-faced hole formed in a current collector, then the terminal can be connected to the current collector, but large gaps may be formed between the riveted portion of the terminal and the current collector, reducing connection reliability
Solution Approach 1:
The invention applies local quality by creating a protrusion at the bottom of the spot-faced hole that concentrates the riveting force at a specific location. This localized structural feature ensures that the terminal is firmly anchored at the bottom surface while maintaining proper contact with the side surface, thereby preventing gap formation and improving connection reliability without requiring uniform reinforcement throughout the entire hole structure.
Solution Approach 2:
The protrusion is formed in advance during the spot-facing process, before the terminal is inserted and riveted. This preliminary action prepares the hole structure to guide the terminal into proper position and ensure firm contact with both the bottom surface and side surface during the subsequent riveting operation, preventing gap formation from occurring in the first place.
2Reliability
If the length of the riveted portion of the terminal is increased to prevent large gaps, then gaps between the riveted portion and the side surface may be reduced, but large gaps are likely to form between the riveted portion and the bottom surface
Solution Approach 1:
The protrusion creates a localized contact point at the bottom of the hole that concentrates the terminal's contact with the bottom surface. This localized feature ensures that even when the riveted portion length is increased, the terminal maintains firm contact at the bottom through the protrusion while the extended length provides contact with the side surface, thereby preventing gaps at both locations simultaneously.
Solution Approach 2:
The invention transitions from a single-dimensional consideration of riveted portion length to a two-dimensional solution by adding the protrusion feature that extends radially from the hole bottom. This dimensional change creates multiple contact points (bottom surface via protrusion and side surface via extended length) that work together to eliminate gaps in different spatial directions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses the formation of large gaps between the terminal and the current collector, resulting in a stronger and more reliable connection between the terminal and the current collector, improving the overall reliability of the connection.
Implementation Method 1
The riveted portion of the terminal is weld-connected to an edge of the spot-faced hole
Data Source
AI summary
A positive electrode terminal is inserted into a current-collector through hole formed, in a positive electrode current collector and riveted in a spot-faced hole formed in the positive electrode current collector. A protrusion is formed on a bottom surface of the spot-faced hole so as to extend around the current-collector through hole, and a riveted portion of the positive electrode terminal covers the protrusion. The riveted portion of the positive electrode terminal is weld-connected to an edge of the spot-faced hole.