Cylinder Battery Tab Stress Reduction via Support Plate
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Solution Overview
Problem
Cylinder type secondary batteries face stress concentration issues on the bent portion of electrode tabs due to the bending and welding process, leading to potential detachment and reduced reliability.
Innovation Solution
A cylinder type secondary battery design incorporating a support plate with a smaller peripheral edge area than the upper insulating plate, where the bent section of the electrode tab protrudes from the peripheral edge of the support plate, reducing stress concentration by allowing the bent section to be pushed into the space formed by the step between the upper insulating plate and the support plate during the pressing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode tab is bent and welded to the cap assembly, then electrical connection is achieved, but stress concentration occurs on the bent portion leading to potential detachment
Solution Approach 1:
The patent introduces a support plate as an intermediary component between the electrode tab and the cap assembly. The support plate receives the bent portion of the electrode tab, providing structural support and distributing stress away from the critical bent section. This mediator prevents direct stress concentration on the welded portion, thereby improving connection reliability while maintaining the necessary electrical connection.
2Ease of operation
If the electrode tab is bent to connect to the cap assembly, then electrical connectivity is established, but the bent portion becomes vulnerable to detachment
Solution Approach 1:
The support plate is installed beforehand to provide cushioning protection to the bent portion of the electrode tab. By positioning the support plate before final assembly, the bent section is received and protected in advance, preventing stress concentration and potential detachment during operation. This prior cushioning maintains assembly ease while significantly improving attachment reliability.
3Productivity
If the electrode tab structure is simplified for manufacturing, then production efficiency increases, but stress management capability decreases
Solution Approach 1:
The patent segments the electrode tab structure by introducing a separate support plate component. This segmentation allows the electrode tab itself to remain simple for manufacturing, while the support plate handles the complex stress distribution function. The bent portion is divided into functional sections, with the support plate specifically managing the stress-prone bent section, thereby maintaining manufacturing efficiency while improving stress management capability.
Data Source
AI summary
A cylinder type secondary battery includes a can having an opening, an electrode assembly in the can, a cap assembly covering the opening of the can, an upper insulating plate between the electrode assembly and the cap assembly; a support plate on the upper insulating plate; the support plate having a peripheral edge, wherein an area of the support plate is smaller than an area of the upper insulating plate, and a first electrode tab extending from the electrode assembly, the first electrode tab having a first section contacting the support plate, a second section contacting the cap assembly, and a bent section between the first section and the second section, wherein a portion of the bent section protrudes from the peripheral edge of the support plate.