Cylindrical Battery Electrode Coating Layout for Higher Space Efficiency
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Solution Overview
Problem
Cylindrical secondary batteries face challenges in maximizing space efficiency of electrode plates, which affects their energy density and stability, particularly in high-capacity applications such as electric vehicles.
Innovation Solution
The design includes a cylindrical secondary battery with a negative electrode plate featuring uncoated portions of varying lengths on its surfaces, and a positive electrode plate with uncoated regions, optimized through stripe and pattern coating methods to enhance active material distribution and electrode assembly configuration, thereby improving space utilization within the battery casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode plate is designed with uniform coating on both surfaces, then the manufacturing process is simple, but the space efficiency of the electrode plate is reduced
Solution Approach 1:
The patent applies local quality by creating asymmetric coating patterns on the electrode plate surfaces. Specifically, the first surface has active material coated across its entire area, while the second surface has active material coated only in a partial area, leaving some regions uncoated. This localized differentiation optimizes space utilization within the battery case while maintaining manufacturing feasibility through controlled coating processes.
2Volume of moving object
If the active material layers are made asymmetric with different lengths, then the space efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by varying the coating area parameters on different surfaces of the electrode plate. The first surface maintains full-area coating while the second surface uses partial-area coating with controlled dimensions. This parameter differentiation allows optimization of space efficiency while the coating process controls the precision of these dimensional parameters.
3Quantity of substance
If the electrode plate occupies more space in the battery, then the energy density increases, but the stability of the battery structure may be compromised
Solution Approach 1:
The asymmetric coating design creates local quality variations that allow the electrode plate to maximize active material content in critical regions while maintaining structural integrity. The uncoated portions are strategically positioned to preserve necessary structural characteristics, thus achieving high energy density without compromising battery stability.
Data Source
AI summary
A cylindrical secondary battery includes: an electrode assembly including a positive electrode plate, a separator, and a negative electrode plate; a case accommodating the electrode assembly and electrically connected to the negative electrode plate; a rivet terminal penetrating a lower surface of the case and electrically connected to the positive electrode plate; and a cap plate sealing an upper portion of the case, wherein the negative electrode plate includes a negative electrode current collector having a first surface and a second surface, a first negative electrode active material layer coated with a negative electrode active material on the first surface, a second negative electrode active material layer coated with the negative electrode active material on the second surface, and a negative electrode uncoated portion, and a length of the first negative electrode active material layer is different from that of the second negative electrode active material layer.