Secondary Battery Fixing Tape Vibration Control
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Solution Overview
Problem
Secondary battery electrode assemblies vibrate within their cans due to external shocks, leading to potential damage and erroneous operation, especially when dropped, as they are not securely attached to the internal surface.
Innovation Solution
A fixing tape is continuously attached from the electrode assembly to the cap assembly's bottom surface, encompassing the positive and negative electrode tabs, providing a secure attachment without the need for an insulating case, using materials like polyimide or polyethylene terephthalate that do not dissolve in the electrolyte, and extending to the lower end of the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is not closely attached to the internal surface of the can, then the manufacturing process is simple, but the electrode assembly vibrates under external shock causing damage and erroneous operation
Solution Approach 1:
The fixing tape integrates multiple functions: it secures the electrode assembly to prevent vibration, provides electrical insulation between the electrode and cap assembly, and acts as a closing element. By combining these functions into a single component, the patent prevents electrode vibration without significantly increasing structural complexity.
Solution Approach 2:
The fixing tape serves multiple purposes simultaneously: mechanical fixation of the electrode assembly, electrical insulation, and structural closing of the battery. This multi-functionality resolves the contradiction by achieving reliable electrode stabilization without adding separate complex components.
2Reliability
If an insulating case is used to prevent electrode vibration, then the electrode assembly is secured, but the battery capacity is reduced due to space occupation
Solution Approach 1:
The fixing tape is implemented as a thin film structure that provides the necessary insulation and fixation functions while occupying minimal space. This thin-film approach prevents electrode vibration without significantly reducing the active material volume, thereby maintaining battery capacity.
Solution Approach 2:
Instead of using a bulky three-dimensional insulating case, the patent employs a two-dimensional thin tape structure that achieves the same protective function with minimal volume occupation, preserving more space for active materials and maintaining battery capacity.
3Reliability
If a fixing tape is attached to secure the electrode assembly, then vibration is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The fixing tape combines fixation, insulation, and closing functions into a single attachment step. By integrating these functions, the patent prevents electrode vibration without requiring multiple separate manufacturing operations, thus minimizing the increase in manufacturing complexity.
Data Source
AI summary
A secondary battery in which a fixing tape is attached to an electrode assembly, a positive electrode tab, a negative electrode tab, and a cap plate without use of an insulating case to prevent the electrode assembly from vibrating. The secondary battery includes an electrode assembly including a positive electrode plate to which a positive electrode tab is coupled, a negative electrode plate to which a negative electrode tab is coupled, and a separator interposed between the positive electrode plate and the negative electrode plate, a can having an opened part on one side to accommodate the electrode assembly, a cap assembly sealing the opened part of the can, and a fixing tape continuously attached from the electrode assembly to a bottom surface of the cap assembly while being attached to the positive electrode tab and the negative electrode tab.