Patterned Pressing for Electrode-Separator Bonding
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Solution Overview
Problem
The electrolyte in secondary batteries is not fully absorbed into the electrode assembly due to the bonding force between the electrode and separator, limiting the improvement in electrode assembly performance.
Innovation Solution
A method involving the formation of a nonbonding portion at the interface between the electrode and separator using a pattern member with pressing protrusions, allowing for improved electrolyte impregnation and subsequent bonding of the nonbonding portion to enhance charging and discharging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electrode and separator are fully bonded together, then the structural integrity is improved, but the electrolyte impregnation is hindered
Solution Approach 1:
The interface between electrode and separator is divided into multiple bonding portions and nonbonding portions. The nonbonding portions create channels that allow electrolyte to permeate through the interface, while bonding portions maintain structural integrity. This segmentation resolves the contradiction by providing both structural strength and electrolyte absorption pathways.
Solution Approach 2:
Different regions of the electrode-separator interface have different bonding characteristics. Bonding portions provide strong adhesion for structural support, while nonbonding portions remain unbonded to facilitate electrolyte penetration. This local differentiation allows simultaneous achievement of structural integrity and electrolyte impregnation.
2Stability of the object's composition
If the electrode and separator are fully bonded together, then the structural stability is improved, but the charging and discharging efficiency is reduced due to unreacted areas
Solution Approach 1:
The interface is segmented into bonding portions for stability and nonbonding portions for electrochemical activity. The nonbonding portions eliminate unreacted areas that would otherwise hinder charging and discharging efficiency, while bonding portions maintain overall interface stability.
Solution Approach 2:
Instead of complete bonding, only partial bonding is applied at specific portions of the interface. This partial action allows the nonbonding portions to remain accessible for electrolyte interaction, thereby maintaining both stability and high charging/discharging efficiency.
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 improves electrolyte impregnation and charging/discharging efficiency by creating a nonbonding space for electrolyte permeation and bonding the nonbonding portion, eliminating unreacted areas and enhancing overall battery performance.
Implementation Method 1
a fourth process (S40) of partially pressing the incomplete electrode assembly through the pattern member on which the patterned pressing protrusion is formed to pattern-bond an interface between the electrode and the separator
Implementation Method 2
the electrolyte is permeated into nonbonding portion of the interface between the electrode and the separator and impregnated up to the inside of the electrode assembly
Implementation Method 3
an eighth process (S80) of heating and pressing an entire surface of the secondary battery to bond the nonbonding portion of the interface between the electrode and the separator
Implementation Method 4
an eighth process (S80) of heating and pressing an entire surface of the secondary battery to bond the nonbonding portion of the interface between the electrode and the separator
Data Source
AI summary
The present invention relates to a method for manufacturing a secondary battery. The method comprises: a first process (S10) of manufacturing an incomplete electrode assembly; a second process (S20) of preparing a pattern member on which a patterned pressing protrusion is formed; a third process (S30) of stacking the pattern member on an outer surface of the incomplete electrode assembly; a fourth process (S40) of partially pressing the incomplete electrode assembly to pattern-bond an interface between the electrode and the separator and thereby to manufacture a complete electrode assembly; a fifth process (S50) of accommodating the complete electrode assembly into a case; a sixth process (S60) of injecting an electrolyte to impregnate the electrolyte into the electrode assembly; a seventh process (S70) of sealing an unsealed surface to manufacture a secondary battery; and an eighth process (S80) of heating and pressing an entire surface of the secondary battery.