Pouch Battery Sealing Fold for Higher Density and Cooling
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Solution Overview
Problem
Pouch-type secondary batteries with protrusions, such as shark-fin or bat ear configurations, face issues of reduced volume density and cooling efficiency when manufactured into modules or packs due to their design.
Innovation Solution
A pouch-type secondary battery design that incorporates a folded portion on the pouch film to eliminate or reduce protrusions, enhancing bulk density and cooling efficiency, achieved through folding and pressing techniques using rollers or folding knives, and potentially involving heating or cooling processes to maintain the folded shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pouch film is sealed on three sides with protrusions at the ends of the non-sealing surface, then the electrode assembly can be easily accommodated, but the volume density and bulk density are reduced
Solution Approach 1:
The protrusions at the ends of the pouch film are extracted and removed through a folding process. The pouch film is folded along a folding line extending from the bottom sealing portion, causing the protrusions to be folded inward and eliminated from the external shape, thereby increasing volume density while maintaining ease of manufacture
Solution Approach 2:
The solution transitions from a two-dimensional flat pouch film configuration to a three-dimensional folded structure. By introducing a folding line and folding the pouch film along this line, the protrusions are redirected into the internal structure, changing the spatial arrangement without compromising manufacturing ease
2Ease of manufacture
If a pouch film is sealed on three sides with protrusions at the ends of the non-sealing surface, then the electrode assembly can be easily accommodated, but the cooling efficiency is reduced
Solution Approach 1:
The protrusions that impede cooling are extracted and removed by folding the pouch film along the folding line. This eliminates the irregular external surfaces that interfere with thermal contact, thereby improving cooling efficiency while maintaining the ease of electrode assembly accommodation
3Volume of moving object
If the pouch film is folded to remove protrusions, then the bulk density is improved, but additional folding and pressing steps are required in the manufacturing process
Solution Approach 1:
The folding line is pre-designed and pre-positioned on the pouch film before sealing. The folding is performed along this predetermined line, which simplifies the manufacturing process by providing a clear guide for the folding operation and reducing the complexity of achieving the desired compact shape
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
The solution effectively removes protrusions, improving the bulk density and cooling efficiency of pouch-type secondary batteries, particularly when integrated into modules or packs, by creating a more compact and efficient sealing configuration.
Implementation Method 1
the protrusion may be folded by rolling of a roller, to form the folded portion
Implementation Method 2
The forming a folded portion may include heating or cooling the protrusion
Data Source
AI summary
In an embodiment, a method for manufacturing a pouch-type secondary battery comprises folding a pouch film to accommodate an electrode assembly in the pouch film, forming a first side sealing portion, a second side sealing portion, and an upper sealing portion at both end portions and an upper portion of the pouch film, and forming a folded portion by pressing a protrusion disposed on ends of the first and second side sealing portions, wherein the folded portion is formed by folding the protrusion towards a bottom portion of the pouch film.