Battery Electrode Sheet Coating Layout for Electrolyte Flow Channels
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Solution Overview
Problem
The thick electrode sheets in power batteries face challenges with electrolyte infiltration and uneven distribution due to expansion, limiting fast-charging performance and lifespan.
Innovation Solution
A manufacturing method that reserves a flow guide channel for electrolyte circulation on the current collector by varying the areal density of coatings on the electrode sheet, forming a flow guide channel using different coating regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode sheet thickness is increased to improve active material loading, then the energy density of the power battery is improved, but the electrolyte infiltration becomes difficult and the transmission speed decreases
Solution Approach 1:
The electrode sheet is segmented into multiple coating regions with different areal densities, creating flow guide channels that divide the electrolyte flow path into multiple channels, thereby improving electrolyte infiltration and transmission speed while maintaining high active material loading
Solution Approach 2:
Different regions of the electrode sheet are assigned different local qualities (areal densities), with flow guide channel regions having lower areal density to facilitate electrolyte flow, while other regions maintain higher areal density for high active material loading, resolving the contradiction between quantity and speed
2Quantity of substance
If the electrode sheet thickness is increased to improve active material loading, then the energy density of the power battery is improved, but the electrolyte distribution becomes uneven due to expansion
Solution Approach 1:
The electrode sheet structure is segmented into flow guide channels that create multiple electrolyte flow paths, ensuring uniform electrolyte distribution across the electrode sheet even during expansion, while maintaining high active material loading in other regions
Solution Approach 2:
The flow guide channels are pre-formed during the coating process before battery assembly, allowing the electrode sheet to accommodate expansion while maintaining uniform electrolyte distribution from the outset, thus preventing uneven distribution issues
3Quantity of substance
If the areal density of the second coating is increased to reduce flow guide channel area, then the active material loading is improved, but the electrolyte circulation is hindered
Solution Approach 1:
The second coating is applied with different areal densities in different regions: lower areal density in flow guide channel regions to ensure electrolyte circulation, and higher areal density in other regions to maximize active material loading, thus resolving the contradiction between quantity and productivity
Data Source
AI summary
Provided are a manufacturing method for a battery electrode sheet, a battery electrode sheet, and a battery. The battery electrode sheet includes a current collector, a first coating and a second coating which are disposed on one side surface of the current collector. The manufacturing method for the battery electrode sheet includes that: one side surface of the current collector is divided into a first region and a second region; a coater is controlled to coat the first region and the second region, a first coating is formed in the first region, and a second coating is formed in the second region, where the areal density of the first coating is greater than the areal density of the second coating.