Rectangular Battery Collector Tabs With Curved Shock Relief
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Solution Overview
Problem
Existing rectangular secondary batteries are prone to tab damage due to shock or vibration, as the tabs subjected to tension are not loose and can be pulled during such events.
Innovation Solution
The design incorporates a curved portion in the collector tabs positioned between the active material arrangement and the collector terminal, allowing for flexibility and reducing the risk of damage during shock or vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tabs are made taut and not loose to ensure stable electrical connection, then electrical connection reliability is improved, but vulnerability to shock and vibration damage increases
Solution Approach 1:
The patent applies curvature to the collector tabs by forming curved portions (U-shaped bends) in the tabs. These curved portions act as shock-absorbing elements that can deform elastically under mechanical stress from shock or vibration, preventing the tabs from being pulled taut and damaged while maintaining stable electrical connection during normal operation.
Solution Approach 2:
The curved portions are pre-formed in the collector tabs during manufacturing, creating built-in cushioning elements before the battery encounters shock or vibration. This preliminary structural design allows the tabs to absorb mechanical shocks through elastic deformation of the curved sections, protecting the weld joints from damage.
2Ease of manufacture
If tabs are made straight and rigid for structural simplicity, then manufacturing complexity is reduced, but resistance to mechanical stress during shock decreases
Solution Approach 1:
The curved portions are formed in the collector tabs using standard metal forming techniques during the tab manufacturing process. This curvature is integrated into the tab structure itself, requiring only additional forming steps that are compatible with existing manufacturing capabilities, while significantly improving the tabs' ability to withstand mechanical stress from shock and vibration.
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
The curved tab design absorbs shocks and prevents excessive pulling, thereby minimizing tab damage and ensuring the battery's integrity under mechanical stress.
Implementation Method 1
each collector tab includes a curved portion and an end, the curved portion being positioned between the active material arrangement portion corresponding thereto and the collector terminal in a height direction of the rectangular outer casing and having at least a part thereof curved
Data Source
AI summary
A rectangular battery with a plurality of stacked positive electrode plates. Each positive electrode plate includes a positive electrode active material arrangement portion and a positive electrode collector tab, the positive electrode active material arrangement portion including a plate-like core body and a positive electrode active material containing layer that is provided at the core body, the collector tab being integrated with the core body and protruding from the positive electrode active material arrangement portion. Each positive electrode collector tab includes a curved portion that is positioned between the corresponding positive electrode active material arrangement portion and the positive electrode collector terminal in a Z direction (a region in the Z direction indicated by B), and has at least a part thereof curved.