Perforated Electrode Plate Coating for Faster Electrolyte Infiltration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electrode plate manufacturing processes face challenges with poor infiltration and interfacial dark spots due to high compacted density, leading to decreased production capacity and battery performance, especially for cells with large heights.
Innovation Solution
An electrode plate manufacturing apparatus and method involving a first coating device, a perforating device, and a second coating device, where one side of the current collector is coated and then perforated, followed by coating the other side, creating through holes for improved electrolyte infiltration and reducing damage to active materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current collector is coated with active material and then perforated, then infiltration efficiency is improved, but the active material coating may be damaged
Solution Approach 1:
The current collector is perforated before applying the active material coating. This preliminary action creates through-holes in the current collector that enable rapid electrolyte infiltration, while the active material is subsequently deposited on the surface without needing to be perforated, thus avoiding damage to the active material while achieving high infiltration efficiency
Solution Approach 2:
The conventional sequence is inverted: instead of coating first and then perforating (which damages the coating), the current collector is perforated first and then coated. This inversion allows the active material to be applied intact while still enabling rapid infiltration through the pre-formed holes in the current collector
2Quantity of substance
If cells with high compacted density are used, then energy density is improved, but infiltration becomes difficult and production capacity decreases
Solution Approach 1:
The current collector is divided into multiple sections with through-holes created at specific intervals. This segmentation allows the electrolyte to infiltrate through multiple pathways simultaneously, enabling rapid infiltration even in cells with high compacted density, thus maintaining both high energy density and high production capacity
Solution Approach 2:
The current collector is designed with a porous structure containing through-holes that facilitate rapid electrolyte penetration. This porous design allows high compacted density electrode plates to still achieve fast infiltration, resolving the contradiction between energy density and production capacity
Data Source
AI summary
An electrode plate manufacturing apparatus includes a first coating device configured to apply a first active material coating on a first side of a current collector; a perforating device configured to perforate the current collector from a second side of the current collector, the second side being opposite to the first side; and a second coating device configured to apply a second active material coating on the second side of the current collector, where the perforating device is located downstream of the first coating device along a travel path of the current collector, and the second coating device is located downstream of the perforating device along the travel path of the current collector.