Pouch Cell Pre-Sealing Tape Bonding Using Textured Metal Foil
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Solution Overview
Problem
Current methods for connecting pre-sealing tapes to metal composite films in pouch cells are complex due to heat sensitivity issues during welding, limiting the use of welding processes and increasing electrical resistance, while also requiring laborious cooling and additional materials for securement.
Innovation Solution
A method involving generating a texture on the metal composite film, applying the pre-sealing tape to cover the texture, and connecting it to form a composite, which can then be cut to a precise contour, allowing for secure adhesion or positive locking without additional cooling or materials, enabling the use of pressure welding and reducing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to connect conductor tabs to arrester tabs, then electrical connection is achieved, but heat input damages the temperature-sensitive pre-sealing strips
Solution Approach 1:
The invention separates the pre-sealing strip from the conductor tab, making them independent components. The pre-sealing strip is applied directly to the pouch foil while the conductor tab is welded separately, eliminating heat exposure to the pre-sealing strip during welding operations.
Solution Approach 2:
The pouch foil acts as an intermediary between the conductor tab and the pre-sealing strip. The conductor tab is welded to the pouch foil, and the pre-sealing strip is separately applied to the pouch foil, using the pouch foil as a mediator to avoid direct heat exposure of the pre-sealing strip.
2Object-affected harmful factors
If cooling is applied during welding to protect pre-sealing strips, then heat damage is prevented, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the pre-sealing strip application step from the welding process. By applying the pre-sealing strip separately after welding is completed, the complex cooling system requirements are eliminated entirely, simplifying the manufacturing process.
3Object-affected harmful factors
If distance between weld seam and pre-sealing strip is increased to avoid heat damage, then pre-sealing strip protection is achieved, but installation space is lost
Solution Approach 1:
By segmenting the pre-sealing strip application from the welding process and applying it directly to the pouch foil, the invention eliminates the need for increased distance between weld seam and pre-sealing strip, maximizing installation space.
4Object-affected harmful factors
If only spot welding, resistance welding, or linear welding are used, then pre-sealing strips are protected, but electrical resistance increases
Solution Approach 1:
The invention segments the pre-sealing strip application from the welding process, allowing the use of superior welding methods like surface/pressure welding for the conductor tab to pouch foil connection, thereby reducing electrical resistance while keeping the pre-sealing strip intact.
Solution Approach 2:
The invention replaces the limited welding methods with surface/pressure welding, which provides better electrical contact and lower resistance. The mechanical application of the pre-sealing strip separately preserves its integrity while enabling superior welding techniques.
5Reliability
If transport lock is provided between conductor tab and pre-sealing tape, then accidental loss is prevented, but device complexity increases
Solution Approach 1:
The invention extracts the pre-sealing strip application from the conductor tab assembly, applying it directly to the pouch foil instead. This eliminates the need for transport locks and associated complexity while ensuring the pre-sealing strip remains securely in place.
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 simplifies the manufacturing process, reduces electrical resistance, eliminates the need for constant cooling and additional materials, and allows for more efficient production of pouch cells with improved electrical properties and reduced heat generation during operation.
Implementation Method 1
The texture on the metal composite foil (2) serves to adhere or provide positive locking for the pre-sealing tape (3)
Implementation Method 2
The texture on the metal composite foil (2) serves to adhere or provide positive locking for the pre-sealing tape (3)
Implementation Method 3
enabling the use of pressure welding and reducing electrical resistance
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
The present invention relates to a method for joining a pre-sealing tape with a metal composite film (2) for pouch cells (4), comprising at least the following steps: a) creating a texture (6) in at least a partial area of the metal composite film (2); b) applying a pre-sealing tape (3) to the metal composite film (2), wherein the texture (6) is at least partially covered by the pre-sealing tape (3); c) joining the pre-sealing tape (3) with the metal composite film (2) to form a composite; d) cutting the composite to a predefined finished contour.