Electrode Assembly Reinforcement for Short-Circuit-Resistant Batteries
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Solution Overview
Problem
Existing secondary batteries face issues with deformation of the electrode assembly, leading to an increased likelihood of electrical short circuits.
Innovation Solution
The introduction of an anti-deformation portion, such as an insulating tape, attached to the positive electrode leading end uncoated portion, along with additional separators, to prevent deformation and reduce the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly is made compact to increase energy density, then the battery capacity increases, but the core deformation occurs leading to electrical short circuits
Solution Approach 1:
The insulating tape is attached to the positive electrode leading end uncoated portion before battery assembly, proactively preventing core deformation before it can occur. This preliminary protective measure ensures the core maintains its shape during subsequent charging, discharging, and expansion/contraction cycles, eliminating the risk of electrical short circuits while maintaining compact battery design
2Device complexity
If the electrode assembly structure is simplified to reduce manufacturing complexity, then production efficiency increases, but core deformation resistance decreases
Solution Approach 1:
Instead of complicating the entire electrode assembly structure, the insulating tape is applied locally only to the positive electrode leading end uncoated portion where core deformation is most likely to occur. This localized reinforcement maintains overall structural simplicity and manufacturing efficiency while providing targeted protection against core deformation at the critical location
Data Source
AI summary
A secondary battery includes an electrode assembly including a negative electrode plate including a negative electrode leading end uncoated portion, a positive electrode plate including a positive electrode leading end uncoated portion, and an anti-deformation portion attached to the positive electrode leading end uncoated portion, an end of the positive electrode leading end uncoated portion and an end of the anti-deformation portion being located ahead of an end of the negative electrode leading end uncoated portion, a case accommodating the electrode assembly, and electrically coupled to the negative electrode plate, and a cap assembly sealing the case.