Secondary Battery Current Collector Structure for Lower Heat Generation
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Solution Overview
Problem
Secondary batteries face heat generation issues at current collector areas, leading to decreased electrode assembly capacity and competitiveness.
Innovation Solution
Incorporating sub-plates made of materials with lower resistance than the current collectors, strategically positioned to reduce heat generation by lowering resistance in the current collection area, and using clad metals or low-resistance materials to further mitigate heat issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the current collector material is designed to be thick to reduce heat generation, then heat generation is reduced, but the capacity of the electrode assembly decreases
Solution Approach 1:
The patent applies local quality by making the sub-plate (made of low-resistance material like copper or aluminum) only at specific locations where heat generation occurs during welding operations, rather than making the entire current collector thick. This localized approach reduces heat generation at critical points while preserving electrode assembly capacity in non-critical areas.
Solution Approach 2:
The patent uses composite materials by combining the sub-plate made of low-resistance material with the current collector made of different material. This composite structure allows the low-resistance sub-plate to handle high-current welding operations with minimal heat generation, while the main current collector maintains its structural function and electrical conductivity without unnecessary material thickness.
2Temperature
If the current collector material is made thick to handle heat, then heat management is improved, but the device complexity increases
Solution Approach 1:
The patent segments the current collector structure into two distinct parts: the sub-plate made of low-resistance material and the main current collector made of different material. This segmentation allows each component to be optimized for its specific function - the sub-plate for heat management during welding and the main current collector for structural support and general electrical conduction - thereby reducing overall structural complexity compared to a uniformly thick design.
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 solution effectively reduces heat generation, enhancing the performance and competitiveness of secondary batteries by optimizing the current collection structure.
Implementation Method 1
Some sections of a welded portion of the current collecting structure are sections where heat is generated... at least one of the sub-plates of the first current collecting part and the second current collecting part is partially or wholly made of a material having lower resistance than the first current collector or the second current collector
Data Source
AI summary
An embodiment of the present invention relates to a secondary battery that can reduce heat generated by a current collector. According to an embodiment of the present invention, material having low resistance is added to the current collection area where heat generation is the greatest to lower the resistance, thereby allowing generation of heat to be reduced.