Electrode Assembly Bonding to Stabilize Stacked Battery Layers
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Solution Overview
Problem
Existing methods for manufacturing electrode assemblies, such as the stacking method, result in unstable electrode movement and reduced capacity per unit volume due to the lack of fixation of negative and positive electrodes, while the lamination winding method improves stability but decreases volume capacity.
Innovation Solution
A method where a negative electrode and a positive electrode are sequentially and alternately stacked with a separator disposed between them, with the separator being heated and bonded to the electrodes to fix their position, and the process involves covering the top surface of each electrode layer with the separator and heating it to ensure stability and prevent movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the stacking method is used to increase capacity per volume, then the volume capacity increases, but the electrode movement stability deteriorates
Solution Approach 1:
The separator is divided into multiple sections: a first separator portion extending in a first direction, a second separator portion extending in a second direction perpendicular to the first, and a third separator portion extending in a third direction perpendicular to both the first and second directions. This segmentation allows the separator to fix electrodes in multiple directions simultaneously, preventing electrode movement while maintaining high volume capacity.
2Stability of the object's composition
If the lamination winding method is used to improve electrode stability, then the electrode movement stability improves, but the capacity per volume decreases
Solution Approach 1:
Instead of using a single linear separator arrangement, the invention extends the separator in three perpendicular directions (first, second, and third directions), adding dimensional constraints to fix the electrode in space. This multi-dimensional approach achieves winding-like stability without the volume loss associated with traditional winding methods.
3Volume of stationary object
If the separator is stacked in the width direction to increase volume, then the volume increases, but the capacity per volume decreases
Solution Approach 1:
The separator is configured with different extensions in different directions: the first separator portion extends in a first direction, the second separator portion extends in a second direction perpendicular to the first, and the third separator portion extends in a third direction perpendicular to both. This localized differentiation allows the separator to occupy minimal width space while providing comprehensive electrode fixation, maximizing capacity per volume.
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 method enhances the stability of the electrode assembly by fixing the electrodes and increases the capacity per unit volume by preventing the separator from being stacked in the width direction, thereby improving the overall performance of the battery.
Implementation Method 1
a method where a negative electrode and a positive electrode are sequentially and alternately stacked with a separator disposed between them, with the separator being heated and bonded to the electrodes to fix their position
Data Source
AI summary
A method for manufacturing an electrode assembly, in which a plurality of electrodes are stacked, wherein a negative electrode and a positive electrode are sequentially and alternately stacked, and a separator is disposed therebetween is provided. The method includes covering a top surface of an electrode disposed at an n layer (n being a natural number) with the separator, heating the separator covering the electrode disposed at the n layer, stacking an electrode disposed at an n+1 layer on the heated separator, covering a top surface of the electrode disposed at the n+1 layer with the separator, and heating the separator covering the electrode disposed at the n+1 layer. The separator is bonded to the electrode, or the separators are bonded to each other to fix the movement of the electrode, thereby improving stability. Since the separator is not stacked in the width direction, capacity per volume increases.