Secondary Battery Tab Configuration for Current Flow
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Solution Overview
Problem
In large-capacity secondary batteries, the increased size of electrode plates can lead to regions where current does not flow, reducing capacity efficiency and potentially causing short circuits due to tab portions of different polarities coming into contact.
Innovation Solution
The design includes electrode assemblies with tab portions that have a width between half and the full width of the electrode plate, and are spaced from the central portion between 0 to 0.5 times the electrode plate width, with chamfered corners to prevent short circuits and burr formation, allowing for efficient current flow and high-rate charge/discharge capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of electrode plates is increased to achieve large-capacity battery, then the battery capacity increases, but regions where current does not flow are created and capacity efficiency decreases
Solution Approach 1:
The electrode plate is segmented by introducing multiple tab portions (first tab portion and second tab portion) at different locations. This segmentation divides the current collection paths into multiple shorter routes, allowing current to flow more efficiently across the entire electrode plate surface, thereby eliminating dead zones and improving capacity efficiency while maintaining large electrode plate size for high capacity.
2Quantity of substance
If the electrode plate size is increased, then the battery capacity increases, but the distance of current flow in the electrode plate increases
Solution Approach 1:
By segmenting the electrode plate with multiple tab portions positioned at different locations, the current collection is divided into multiple shorter paths. This reduces the maximum current flow distance from the far edges of the electrode plate to the tabs, improving current distribution and reducing resistance losses while maintaining the large electrode plate area needed for high capacity.
3Power
If tab portions are positioned close to each other to reduce current flow distance, then power characteristic improves, but short circuit risk increases due to different polarities
Solution Approach 1:
The electrode plate structure employs different local qualities by positioning tabs of different polarities (positive and negative) at strategically different locations. The first tab portion and second tab portion are placed to minimize current flow distance while maintaining sufficient separation between opposite polarity tabs, thus improving power characteristics without creating short circuit risks. Each local region is optimized for its specific function.
Data Source
AI summary
A secondary battery includes an electrode assembly. The electrode assembly includes a first electrode plate provided with a first tab portion, a second electrode plate provided with a second tab portion, and a separator interposed between the electrode plates. In the electrode assembly, the width of the first or second tab portion is in the range from over 0.5 of the half of the width of each of the electrode plates to below the half of the width of each of the electrode plates, and the first or second tab portion is provided to have a spacing distance b from a central portion of the first or second electrode plate to a starting portion of the first or second tab portion. The spacing distance is in the range from over 0 mm to less than half of the half (¼) of the width of the first or second electrode plate.