Battery Rivet Terminal Insulation for Short-Circuit Prevention
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Solution Overview
Problem
Secondary batteries face issues with short circuits between the negative electrode and the rivet terminal, which can compromise safety and performance.
Innovation Solution
Incorporating a distance-maintaining member made of insulative materials like polyethylene, polypropylene, or polyethylene terephthalate between the positive electrode current collector and the case, along with an inner insulating part, to maintain a safe distance and prevent electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the positive electrode current collector is placed close to the rivet terminal to reduce device volume, then the battery capacity increases, but the risk of short circuit between the negative electrode and rivet terminal increases
Solution Approach 1:
An insulating part is introduced as an intermediary component between the positive electrode current collector and the rivet terminal. This insulating part physically separates the two components, preventing direct contact and potential short circuits while allowing the current collector to be positioned close to the terminal for compact battery design.
Solution Approach 2:
The insulating part extends in the radial direction of the battery, creating a dimensional barrier that prevents short circuits without significantly increasing the axial height or overall volume of the battery. This allows compact design while maintaining safety.
2Quantity of substance
If the positive electrode current collector is positioned closer to the electrode assembly to increase capacity, then the battery capacity improves, but the stability of the structure decreases
Solution Approach 1:
The insulating part acts as a structural mediator that provides stable positioning for the positive electrode current collector relative to the rivet terminal. This allows the current collector to be positioned optimally for capacity while maintaining consistent spacing and structural stability through the insulating barrier.
Data Source
AI summary
A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case accommodating the electrode assembly; a positive electrode current collector in the case and electrically connected to the first electrode plate; a rivet terminal having one side connected to the positive electrode current collector and another side extending to an outside of the case; an inner insulating part between the positive electrode current collector and the case to block an electrical connection between the positive electrode current collector and the case; and a distance-maintaining member between the inner insulating part and the positive electrode current collector to maintain a distance between the inner insulating part and the positive electrode current collector.