Electrode Assembly Height Layout to Prevent Base Material Drooping
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Solution Overview
Problem
Secondary batteries face issues with base material areas drooping or bending, leading to potential short-circuiting and reduced electrical coupling areas, which affect performance and manufacturing efficiency.
Innovation Solution
The design of the secondary battery includes varying heights for the front and rear end areas of the electrode assembly's base material to prevent drooping, with specific turn ranges and tab configurations to enhance electrical coupling and manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the base material area is compacted or bent to improve space utilization, then the battery density increases, but the base material area droops causing short-circuiting and reduced electrical coupling
Solution Approach 1:
The base material area is segmented into multiple turn ranges with different height characteristics. The front end area (12-22 turns from winding front end) has different height specifications than the rear end area (1-4 turns from winding rear end), allowing each segment to be optimized for its specific function while preventing drooping throughout the entire structure
Solution Approach 2:
Different regions of the base material area are given different height properties to serve different functions. The front end area has specific height characteristics optimized for electrical coupling, while the rear end area has different height characteristics optimized for insulating member coupling, preventing drooping in each specific location
2Quantity of substance
If the base material area is compacted or bent to improve space utilization, then the battery density increases, but the electrical coupling area is reduced
Solution Approach 1:
The front end area of the base material (12-22 turns from winding front end) is specifically designed with height characteristics that preserve electrical coupling effectiveness. This local optimization ensures that the electrical coupling area maintains its functionality even when the overall structure is compacted
3Ease of manufacture
If the insulating member is to be easily coupled to the electrode assembly, then the rear end area height should be reduced, but this may affect the overall structural stability
Solution Approach 1:
The rear end area (1-4 turns from winding rear end) is specifically designed with reduced height characteristics that facilitate insulating member coupling. This localized modification allows easy assembly of the insulating member without compromising the overall structural stability, as other regions maintain their full height and structural integrity
Data Source
AI summary
A secondary battery is provided in which a front end area of a base material and a rear end area of the base material of an electrode assembly have different heights from each other to prevent a base material area from drooping when it is compacted or bent. A secondary battery includes a case and an electrode assembly including a first electrode plate and a second electrode plate accommodated in the case. The first electrode plate includes a base material, an active material coating area coated with an active material on the base material, a base material exposed area that is not coated with the active material, a winding front end at which winding of the first electrode plate starts, and a winding rear end at which the winding of the first electrode plate ends. A height of a base material front end area at which the winding of the base material exposed area starts is different from a height of a base material rear end area at which the winding ends.