Pouch Battery Electrolyte Injection with Support Sealing Segmentation
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Solution Overview
Problem
High-capacity pouch-type secondary batteries face manufacturing defects such as deformation due to increased internal electrolyte, which affects their performance and lifespan.
Innovation Solution
The implementation of an electrolyte injection device and a manufacturing method that involves forming a support sealing part between the gas room and the main room of the exterior material, allowing for even electrolyte distribution and preventing physical deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size and thickness of high-capacity pouch-type batteries are increased, then the battery capacity is improved, but the exterior material deforms due to increased internal electrolyte
Solution Approach 1:
The interior space of the exterior material is divided into a main room and a gas room that are spatially separated. The gas room is further divided into multiple spaces by support sealing parts. This segmentation allows electrolyte to be injected into multiple separate spaces rather than one large space, distributing the internal pressure and preventing exterior material deformation while maintaining high battery capacity.
Solution Approach 2:
Support sealing parts are introduced as intermediary structures between the gas room and the main room. These support sealing parts serve as both dividers for electrolyte injection spaces and structural reinforcements that prevent the exterior material from deforming under the pressure of increased internal electrolyte volume in high-capacity batteries.
2Quantity of substance
If electrolyte is injected into a large internal space, then the battery capacity is improved, but the exterior material sags and deforms
Solution Approach 1:
The large internal space is segmented into multiple smaller spaces using support sealing parts. Electrolyte is injected into each smaller space separately, which distributes the pressure more evenly throughout the battery structure. This prevents the exterior material from sagging or deforming while still accommodating the required volume of electrolyte for high capacity.
Solution Approach 2:
The problem of electrolyte injection in a large space is solved by adding a spatial dimension through support sealing parts that extend in directions both parallel and perpendicular to the longitudinal direction of the main room. This creates a three-dimensional network of divided spaces, allowing electrolyte distribution across multiple dimensions and preventing concentration of pressure in any single area.
3Manufacturing precision
If the gas room is divided into multiple spaces, then the electrolyte distribution is improved, but the device complexity increases
Solution Approach 1:
The gas room is segmented into multiple injection spaces using support sealing parts that are integrated into the existing exterior material structure. While this creates multiple spaces for improved electrolyte distribution, the support sealing parts are formed as part of the molding process rather than added as separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The support sealing parts serve multiple functions simultaneously: they divide the gas room into multiple injection spaces for uniform electrolyte distribution, provides structural reinforcement to prevent exterior material deformation, and are integrated into the molding process to reduce manufacturing steps. This multi-functionality offsets the increased structural complexity by consolidating multiple roles into single components.
Data Source
AI summary
Methods of manufacturing secondary batteries are disclosed. In an embodiment, a method may include: placing an exterior material including an exterior material bending part, a main room, and a gas room spaced apart from the main room; inserting an electrode assembly into the main room; sealing opposite open ends of the exterior material; forming a support sealing part in a space between the gas room and the main room to divide the space into at least two spaces in a longitudinal direction; injecting an electrolyte into the at least two spaces; sealing a second end of the exterior material; forming at least one discharge hole on a side of the gas room; cutting the exterior material including the support sealing part and the gas room above the main room after internal gas is discharged; and sealing the second end of the cut exterior material above the main room.