Secondary Battery Tab Structure for Low Resistance and Roundness
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Solution Overview
Problem
Secondary batteries face safety concerns and performance degradation due to internal pressure and temperature increases from abnormal use, such as overcharge or short-circuit, which can lead to fire risks and reduced lifespan.
Innovation Solution
The design includes an electrode assembly with protruding first and second tabs, coupled to current collection tabs, which are securely attached using ultrasonic welding, and integrated into a cap assembly with a safety vent, allowing for increased electrical efficiency and manufacturing efficiency while preventing deformation and maintaining roundness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate lead tabs are coupled to each other, then electrical connection is established, but deformation occurs and roundness degrades
Solution Approach 1:
The patent merges the lead tabs and current collection tabs into a single integrated structure. The current collection tabs are formed as an integral part of the electrode plates, eliminating the need for separate lead tabs that would require coupling. This integration prevents deformation and maintains the roundness of the battery while ensuring reliable electrical connection.
2Productivity
If conventional manufacturing methods are used, then manufacturing efficiency is maintained, but electrical resistance increases
Solution Approach 1:
The patent segments the current collection path into multiple parallel current collection tabs extending from the electrode plates. This segmentation creates multiple parallel electrical pathways, reducing overall electrical resistance while maintaining compatibility with conventional manufacturing methods. The segmented tabs can be easily integrated into existing production lines.
3Reliability
If internal pressure increases due to abnormal use, then safety risk increases, but battery structure remains unchanged
Solution Approach 1:
The patent incorporates a safety vent mechanism that is pre-configured to activate when internal pressure exceeds safe thresholds. The safety vent is designed in advance to release pressure before dangerous conditions develop, preventing fire risks and structural failure. This preliminary safety mechanism is integrated into the battery structure without requiring complex additional components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances electrical efficiency, prevents deformation, and ensures safety by reducing electrical resistance and allowing conventional manufacturing methods to be used, while the safety vent effectively manages internal pressure to prevent fires.
Implementation Method 1
The first current collection tab may be positioned at front and rear end of the first tabs to then be coupled to the first tabs by ultrasonic welding.
Data Source
AI summary
Disclosed is a secondary battery, which has a reinforced strength and can simplify the manufacturing process thereof. For example, one embodiment provides a secondary battery which comprises: an electrode assembly including a first electrode plate and a second electrode plate, wherein one of the first electrode plate and the second electrode plate includes a plurality of first tabs formed to protrude in one direction; a first current collection tab coupled to the first tabs; a case housing the electrode assembly; and a cap assembly coupled to the upper part of the case, wherein the first current collection tab is coupled to one of the cap assembly and the bottom surface of the case.