Cylindrical Battery Electrode Layout for Tab-Less Current Collection
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Solution Overview
Problem
Conventional cylindrical batteries face challenges with complex electrical connections, high resistance, heat generation, and internal short circuits due to strip-shaped electrode tabs, which complicate manufacturing and increase the risk of ignition during rapid charging, especially when scaled for electric vehicles.
Innovation Solution
A tab-less cylindrical battery design where the positive and negative electrode uncoated portions are positioned at the top and bottom, respectively, with current collecting plates welded directly to these areas to improve current collection efficiency, and the use of silicon-containing negative electrode active materials and specific particle size distributions for the positive electrode active material to enhance thermal stability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If strip-shaped electrode tabs are used for electrical connection, then the battery can be manufactured with conventional methods, but the electrical connection structure becomes complicated and resistance increases
Solution Approach 1:
The patent extracts and eliminates the strip-shaped electrode tabs from the battery structure. Instead of using separate tabs for electrical connection, the invention uses the uncoated portions of the electrodes themselves as connection points, simplifying the electrical connection structure while maintaining conventional manufacturing capabilities
Solution Approach 2:
The uncoated portions of the electrodes serve multiple functions: they act as both the electrical connection terminals and the structural support for mounting current collecting plates. This multi-functionality reduces the need for separate components and simplifies the overall electrical connection structure
2Ease of manufacture
If strip-shaped electrode tabs are used, then conventional manufacturing can be applied, but heat generation increases during rapid charging
Solution Approach 1:
The patent changes the geometric parameters of the electrical connection interface by using uncoated portions with larger surface areas compared to conventional strip-shaped tabs. This increased surface area improves current distribution and reduces resistance, thereby reducing heat generation during rapid charging while maintaining compatibility with conventional manufacturing processes
Solution Approach 2:
The invention employs composite structures where current collecting plates are welded to the uncoated portions of the electrodes. This composite design combines the advantages of both the electrode material and the current collecting plate material, optimizing both electrical conductivity and thermal management properties
3Reliability
If positive and negative terminals are located on opposite sides, then electrical connection can be established, but insulation and sealing parts must be applied to both upper and lower portions
Solution Approach 1:
The patent merges the locations of the positive and negative terminals to the same side of the battery (upper portion). This consolidation allows insulation and sealing parts to be applied only at the upper portion where both terminals are located, eliminating the need for separate insulation and sealing components at the lower portion and simplifying the overall structure
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 simplifies electrical connections, reduces internal resistance, prevents internal short circuits, and improves thermal stability and energy density, making it suitable for larger form factors and electric vehicle applications.
Implementation Method 1
current collecting plates welded directly to these areas
Data Source
AI summary
A cylindrical battery includes an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound. The first electrode and the second electrode include a first uncoated portion and a second uncoated portion, respectively. At least one of the first uncoated portion and the second uncoated portion includes a core-side uncoated portion, an outer circumference uncoated portion, and an intermediate uncoated portion interposed therebetween. At least one of the core-side uncoated portion and the outer circumference uncoated portion has a relatively smaller height than the intermediate uncoated portion in a winding axis direction. The cylindrical battery also includes a battery housing configured to accommodate the electrode assembly through an opening and electrically connected to the second uncoated portion; an external terminal electrically connected to the first uncoated portion through a closed portion of the battery housing; and a cap plate covering the opening.