Electrode Plate Layout for Higher Battery Energy Density
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Solution Overview
Problem
Current battery technologies face challenges in enhancing energy density, particularly due to underutilization of uncoated regions on electrode plates where the active substance layer is not applied, leading to reduced battery performance.
Innovation Solution
The electrode plate design includes a current collector with a coated region and an uncoated region, where the uncoated region is strategically sized and positioned to allow for a larger active substance application without compromising the connection to the tab, thereby increasing energy density. This design features a tab connected to the uncoated region, with specific dimensions and configurations that balance active substance application and connection ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the uncoated region is made larger to facilitate tab connection, then the ease of manufacture is improved, but the energy density deteriorates due to reduced active substance coverage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dimensions and position of the uncoated region. By setting specific width (5-50mm) and length (10-200mm) parameters, and positioning it within defined distances from the tab edge, the design optimizes the balance between tab connection accessibility and active substance coverage area, thereby improving ease of manufacture while maintaining energy density.
2Ease of operation
If the uncoated region extends beyond the coated region in width direction, then the ease of operation is improved for tab welding, but the productivity deteriorates due to reduced active substance application area
Solution Approach 1:
The patent resolves this contradiction by changing the geometric parameters of the uncoated region. By limiting the uncoated region's width to be no more than that of the coated region, and controlling its length and position relative to the tab, the design ensures sufficient area for tab welding operations while maximizing the active substance application area, thus improving productivity and energy density.
3Device complexity
If the coated region is minimized to reduce manufacturing complexity, then the device complexity is reduced, but the energy density deteriorates due to less active substance capacity
Solution Approach 1:
The patent applies local quality by creating a differentiated structure where the uncoated region serves the specific local function of tab connection, while the coated region maximizes active substance coverage. This localized functional division allows the coated region to be minimized only to the extent necessary for tab connection, rather than reducing the entire electrode structure, thereby maintaining high active substance capacity while simplifying manufacturing.
Data Source
AI summary
An electrode plate includes a current collector and a tab. The current collector includes a coated region coated with an active substance layer and an uncoated region not coated with the active substance layer. In a width direction of the current collector, the uncoated region does not surpass the coated region. The tab is connected to the uncoated region.