Flexible Collecting Tab for Secondary Battery Resistance Reduction
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Solution Overview
Problem
Existing secondary batteries face challenges in reducing electric resistance and increasing the size of the electrode assembly while ensuring efficient assembly and sealing, particularly due to rigid collecting tabs that are resistant to bending and can cause damage from external shocks.
Innovation Solution
A secondary battery design featuring a flexible collecting tab that can be bent, electrically connected to both the electrode assembly and terminal plate without a separate member, reducing current path length and allowing for increased electrode assembly size, with a structure that includes insulators and a seal gasket for enhanced electrical insulation and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid collecting tab is used, then structural strength is improved, but electric resistance increases and the electrode assembly size is limited
Solution Approach 1:
The collecting tab changes from a rigid structure to a flexible structure by altering the physical parameters of the material or its configuration. This flexibility allows the collecting tab to bend during assembly, reducing electric resistance while maintaining sufficient structural strength through appropriate material selection and dimensional design.
2Stability of the object's composition
If a rigid collecting tab is used, then structural stability is improved, but assembly efficiency deteriorates
Solution Approach 1:
The collecting tab transitions from a static rigid component to a dynamic flexible component that can adapt its shape during assembly. The flexibility enables the tab to bend and conform to the assembly process requirements, improving assembly efficiency while the inherent material properties maintain sufficient structural stability for its function.
3Reliability
If a flexible collecting tab is used, then electric resistance is reduced and electrode assembly size is increased, but structural strength may be compromised
Solution Approach 1:
The collecting tab is constructed using composite material structures or specially engineered materials that combine flexibility with sufficient strength. This allows the tab to exhibit bending behavior for reduced electric resistance and increased electrode assembly size while maintaining the structural integrity needed for its electrical connection function.
4Productivity
If a flexible collecting tab is used, then assembly efficiency is improved, but protection against external shocks may be reduced
Solution Approach 1:
The collecting tab's flexibility parameter is optimized to balance assembly efficiency and shock resistance. The material properties and geometric parameters are selected such that the tab can bend during assembly for improved efficiency while maintaining sufficient rigidity and strength to withstand external shocks during battery operation and handling.
Data Source
AI summary
The present invention refers to a secondary battery and a secondary battery pack. The secondary battery includes a case; an electrode assembly inside the case; a cap plate coupled with the case, the cap plate having an inner side facing an inside of the case and an outer side facing an outside of the case; a flexible collecting tab electrically connected with the electrode assembly and extending through the cap plate from the inner side to the outer side thereof; and, a terminal plate outside of the case and adjacent to the outer side of the cap plate, the flexible collecting tab being electrically connected with the terminal plate.