Electrode Stack Channel Layout for Faster Electrolyte Impregnation
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Solution Overview
Problem
Conventional battery manufacturing methods face challenges in improving the ability of electrolyte solution to impregnate active material layers, as reducing the width of uncoated regions on current collectors can hinder electrolyte flowability and lead to incomplete permeation.
Innovation Solution
A battery design featuring an electrode stack with current collectors, active material layers, and a sealing body that forms internal spaces with polygonal shapes and injection ports, where the cross-sectional area of uncoated regions is larger than that of channels, facilitating easier electrolyte solution permeation and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width of uncoated regions is reduced to improve battery capacity, then the active material layer coverage increases, but the flowability of electrolyte solution in channels deteriorates
Solution Approach 1:
The invention applies different cross-sectional area ratios at different locations within the uncoated region. Specifically, the cross-sectional area of the uncoated region is designed to be larger than that of the channels in certain areas, creating localized variations in flow resistance that guide electrolyte distribution while maintaining overall compact design
Solution Approach 2:
The invention changes the geometric parameters of the uncoated regions by controlling their cross-sectional areas relative to channel cross-sectional areas. By setting specific area relationships (uncoated region area > channel area), the invention optimizes the balance between capacity and flowability through parameter optimization
2Quantity of substance
If the width of uncoated regions is reduced too much, then battery capacity improves, but the electrolyte solution permeation becomes incomplete
Solution Approach 1:
The invention creates specific local regions where the uncoated cross-sectional area exceeds the channel cross-sectional area, ensuring that electrolyte solution can adequately permeate these critical zones while maintaining reduced uncoated region dimensions overall
Solution Approach 2:
The invention pre-establishes adequate uncoated region cross-sectional areas in strategic locations before electrolyte injection, ensuring that permeation pathways are sufficiently dimensioned to allow complete electrolyte distribution throughout the battery structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the ability of the electrolyte solution to impregnate active material layers, reducing permeation time and preventing incomplete spreading, thereby improving battery capacity and manufacturing efficiency.
Implementation Method 1
a first pressure reduction step of reducing the pressure of an internal space of a battery to a first pressure when causing an electrolyte solution to permeate the internal space
Implementation Method 2
causing an electrolyte solution to permeate the internal space
Data Source
AI summary
A battery includes: an electrode stack including a stack of electrodes, each including a current collector and an active material layer divided with channels in between; a sealing body that forms internal spaces holding electrolyte solution between current collectors and seals the internal spaces; and injection ports formed in sealing body and communicate internal spaces to the outside, wherein the internal spaces are formed by channels and uncoated regions around active material layers where active material layers are not provided, internal regions sealed by sealing body have polygonal shape when viewed from stacking direction of the electrode stack, the channels extend between divided regions of the active material layers from the side where the injection ports are in the opposite direction thereof, and cross-sectional area of regions of the uncoated regions that face surfaces where the injection ports are formed is larger than a cross-sectional area of the channels.