Wound Battery Cell Electrode Layout for Continuous Double-Sided Coating
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Solution Overview
Problem
The production efficiency of battery cells is low due to the need for frequent changes in coating manner during manufacturing, which affects the utilization of electrode active substance layers and leads to reduced energy density and increased risks of short circuits.
Innovation Solution
A battery cell design featuring a wound electrode assembly with strategically positioned active substance layers and separators, allowing for continuous double-sided coating and synchronized winding, which reduces the number of coating changes and enhances energy density while minimizing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single-sided coating is used for electrode plates, then manufacturing process is simpler, but production efficiency is reduced due to frequent coating manner changes
Solution Approach 1:
The patent inverts the conventional single-sided coating approach by implementing double-sided coating on electrode plates. The negative electrode plate has active substance layers on both the first and second surfaces, allowing continuous coating without changing coating manners during production, thereby improving production efficiency while the increased coating complexity is offset by streamlined manufacturing processes
Solution Approach 2:
The double-sided coating structure enables continuous coating action without interruption or process changes. The electrode plates can be continuously coated on both sides simultaneously, eliminating the need to switch between different coating manners, thus maintaining continuous useful action and improving overall production efficiency
2Quantity of substance
If more active substance layers are added to increase energy density, then energy density improves, but the risk of short circuits increases
Solution Approach 1:
The patent introduces a separator as an intermediary between the positive and negative electrode plates. The separator prevents direct contact between electrodes while allowing ion transport, thus enabling the addition of more active substance layers to increase energy density without proportionally increasing short circuit risk
Solution Approach 2:
The patent applies different properties to different regions: the separator provides insulation where needed (between electrodes) while maintaining ion conductivity in its structure. The active substance layers are strategically positioned on specific surfaces with controlled thicknesses, creating local quality variations that maximize energy density while maintaining safety
3Productivity
If double-sided coating is implemented, then production efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent makes the coating system universal by designing a double-sided coating capability that handles both surfaces simultaneously with the same coating process. This multi-functional approach improves productivity while the standardized process reduces precision variability compared to switching between different coating manners
Data Source
AI summary
An electrode assembly of a battery cell includes a flat region and a first bent region connected in a first direction; a positive electrode plate includes a positive electrode winding starting section and first flat section located in the flat region; and a negative electrode plate includes a negative electrode winding starting section. The negative electrode winding starting section is located in the flat region, and in a second direction, the negative electrode winding starting section is located between the positive electrode winding starting section and the first flat section. The first separator has a first winding starting end, where the first winding starting end is flush with a positive electrode winding starting end, or the first winding starting end is flush with a negative electrode winding starting end.