Secondary Battery Rivet Terminal Flange Design
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Solution Overview
Problem
Secondary batteries face challenges in pressure release without interference from bus bars and maintaining sufficient sealing strength and welding quality, particularly due to the placement and design of rivet terminals and gaskets in their assembly.
Innovation Solution
A secondary battery design featuring a rivet terminal with flanges and a gasket configuration that allows for smooth pressure release through a safety vent, while maintaining sealing strength by optimizing the ratio of the flange diameter to the can diameter and incorporating a reinforcement plate for improved rigidity, ensuring effective electrical insulation and secure welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rivet terminal is installed in the can to provide electrical connection, then electrical connectivity is improved, but the safety vent may be interfered with during pressure release
Solution Approach 1:
The battery structure is divided into two separate surfaces: one surface (first surface) for electrical connections including rivet terminal, and the opposite surface (second surface) for safety vent. This segmentation eliminates interference between electrical components and pressure release functionality while maintaining both functions effectively.
2Strength
If the flange diameter is increased to improve sealing strength, then sealing performance is improved, but the ratio of flange diameter to can diameter becomes too large
Solution Approach 1:
The patent specifies an optimized parameter range for the flange diameter ratio (10% to 65% of can diameter) to achieve optimal sealing strength. This parameter optimization ensures sufficient sealing performance while maintaining proper structural proportions and avoiding excessive flange size.
3Strength
If a gasket is added between the can and rivet terminal to improve sealing, then sealing strength is improved, but the device complexity increases
Solution Approach 1:
A gasket is introduced as an intermediary component between the can and rivet terminal to enhance sealing strength. The gasket acts as a mediator that improves the sealing interface without requiring fundamental changes to the existing rivet terminal structure, thereby balancing sealing improvement with acceptable assembly complexity.
Data Source
Figure 1
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AI summary
A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a can having a closed upper surface with a rivet opening therein and an open lower surface to accommodate the electrode assembly, the can being electrically connected to the first electrode plate; a rivet terminal in the rivet opening and electrically connected to the second electrode plate; a gasket between the can and the rivet terminal; and a cap plate sealing the lower surface of the can.