Pouch Battery Tab Sealing Layout for Packaging Film Clearance
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Solution Overview
Problem
The asymmetry in packaging structures of battery cells due to the placement of a separator after packaging leads to a non-separator side of the tab being closer to the packaging film, compromising the safe distance and increasing the risk of contact short circuits, thereby reducing battery safety.
Innovation Solution
A battery design where the thickness of hot melt adhesive on the sealing edge near the separator is greater than that on the side away from the separator, ensuring a safe distance is maintained between the packaging film and the tab, reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If packaging is performed after the separator is added, then the battery cell structure is completed, but the non-separator side of the tab becomes closer to the packaging film, resulting in asymmetric structure and high risk of contact short circuits
Solution Approach 1:
The patent applies asymmetry by intentionally creating different adhesive thicknesses on different sides of the tab. The first sealing edge (non-separator side) has greater adhesive thickness than the second sealing edge (separator side), compensating for the asymmetric position of the tab relative to the packaging film and maintaining adequate safety distance.
Solution Approach 2:
The patent applies local quality by varying the adhesive thickness at different locations. Specifically, the adhesive layer on the first sealing edge has greater thickness than on the second sealing edge, providing enhanced protection and safety distance where it is most needed (at the non-separator side closer to packaging film).
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 design maintains a safe distance between the packaging film and the tab, thereby enhancing battery safety by minimizing the risk of contact short circuits.
Implementation Method 1
a thickness of a hot melt adhesive on the first sealing edge at a side, close to the separator, of a tab of each battery cell of at least one of the first battery cell and the second battery cell is greater than a thickness of a hot melt adhesive on the first sealing edge at a side, away from the separator, of the tab of the battery cell
Data Source
AI summary
A battery includes first and second battery cells, a packaging film and a separator. A first sealing edge where tabs of the first and second battery cells are located is formed by the first and second film housings and the separator. A thickness of a hot melt adhesive on the first sealing edge at a side, close to the separator, of a tab of each battery cell of at least one of the first and second battery cells is greater than a thickness of a hot melt adhesive on the first sealing edge at a side, away from the separator, of the tab of the battery cell, which ensures that a certain distance is maintained between a packaging film and a non-separator side of a tab after sealing, so as to reduce a risk of contact short circuits at the tab, thereby improving a safety of a battery.