Pouch Battery Side Wall Curvature for Compact Sealing
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Solution Overview
Problem
Conventional pouch-type lithium secondary batteries face challenges in forming curved surfaces for the side walls of the pouch, leading to a decreased capacity-to-volume ratio and increased width, making it difficult to enhance battery capacity and increasing the risk of sharp corners being damaged.
Innovation Solution
The method involves forming the side walls of the pouch with a groove and flange parts that are connected and welded in a way that allows for curved surfaces, enabling easier assembly and reducing the width of the battery while maintaining a secure seal, allowing for the injection of electrolyte solution and enhancing the capacity-to-volume ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the side walls of the pouch are formed with conventional flat structures, then the manufacturing process is simple, but the capacity-to-volume ratio is decreased and the width is increased
Solution Approach 1:
The pouch side walls are formed with curved surfaces instead of flat structures. The curvature allows the pouch to better fit the cylindrical or curved shape of the electrode assembly, reducing empty spaces and improving the capacity-to-volume ratio while maintaining a compact width
2Reliability
If the pouch width is increased to accommodate conventional sealing structures, then the sealing is more secure, but the battery width increases and capacity-to-volume ratio decreases
Solution Approach 1:
The sealing structure transitions from a two-dimensional flat extension to a three-dimensional curved configuration. The extended part of the pouch wraps around the electrode assembly in a curved manner, providing secure sealing through multi-point contact while maintaining a compact width profile
3Ease of operation
If conventional flat pouch structures are used, then the assembly process is straightforward, but sharp corners are prone to damage from external contact
Solution Approach 1:
The pouch side walls are formed with curved surfaces that eliminate sharp corners. The continuous curvature distributes mechanical stress more evenly and prevents concentration of forces at corner points, thereby reducing the risk of damage from external contact while maintaining assembly simplicity
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 approach allows for a more compact and efficient battery design with improved capacity-to-volume ratio, easier installation in curved devices, and reduced risk of damage from external contact, while facilitating even electrolyte distribution.
Implementation Method 1
the flange part and the extended part are connected and welded in a way that allows for curved surfaces
Data Source
AI summary
A pouch, in which an electrode assembly of a battery is held, including a frame, including a groove into which the electrode assembly is inserted with a front of the electrode assembly temporarily exposed, upper and lower flanges bordering upper and lower ends of the groove, and extended parts on either side of the groove, front and upper sealing parts formed when the extended parts are folded over the front of the electrode assembly and the upper and lower flanges and sealed together and to the upper flange, respectively, the front and upper sealing parts defining a pocket in which an electrolyte solution is injected toward the electrode assembly, and a lower sealing part formed when the folded extended parts are sealed to the lower flange.