Pouch Wing Heat-Bending to Prevent Sealing Cracks in Battery Cells
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Solution Overview
Problem
Pouch-type battery cells experience insulation resistance defects due to cracks in the sealing part of the pouch wing, which are not adequately addressed by existing bending devices that fail to provide sufficient heat to the sealing region, leading to microcracks and potential insulation failures.
Innovation Solution
A device for bending the pouch wing using a pair of heating blades that apply heat and pressure in multiple directions to melt and bend the sealing part, preventing cracks and improving insulation resistance, featuring a block-type bending part with inclined surfaces to maintain a stable 90-degree bend and prevent springback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bending device is used to bend the pouch wing, then the bending operation can be performed, but the sealing part is not sufficiently heated leading to microcracks and insulation resistance defects
Solution Approach 1:
The heating blades are positioned to contact and heat the sealing part of the pouch wing before the bending operation is performed. This preliminary heating prevents microcracks during bending by ensuring the sealing material is sufficiently pliable, thereby improving insulation resistance without requiring higher bending temperatures.
Solution Approach 2:
The heating blades serve as an intermediary element between the bending device and the pouch wing. They transfer thermal energy to the sealing part specifically, enabling controlled heating at the critical sealing region without overheating the entire pouch structure, thus resolving the temperature contradiction.
2Productivity
If the pouch wing is bent without sufficient heat treatment, then the bending process is simpler and faster, but cracks occur in the sealing part reducing battery reliability
Solution Approach 1:
The heating function and bending function are merged into a single integrated operation. The heating blades remain in contact with the sealing part during the bending process, combining thermal treatment and mechanical deformation into one step. This maintains productivity while ensuring sealing integrity through simultaneous heating and bending.
Solution Approach 2:
The heating action continues throughout the bending process rather than being a separate preliminary step. The heating blades maintain continuous thermal contact with the sealing part during the entire bending operation, ensuring the material remains at optimal temperature for deformation without cracking, thus maintaining both productivity and reliability.
3Reliability
If the sealing part is heated to high temperature, then cracks are prevented, but the risk of thermal damage to other components increases
Solution Approach 1:
Heating is applied locally only to the sealing part of the pouch wing through the heating blades, rather than heating the entire pouch structure. This localized thermal treatment prevents cracks in the sealing region while avoiding thermal damage to other components such as the electrode assembly and electrolyte, thus resolving the contradiction between sealing integrity and thermal damage risk.
Solution Approach 2:
The pouch structure is segmented into the sealing part and other components for differential treatment. The heating blades target only the sealing part specifically, applying thermal energy selectively to this region. This segmentation allows the sealing part to receive necessary heat treatment while other components remain at safe temperatures, preventing both cracks and thermal damage.
4Device complexity
If the pouch wing is bent once in a single direction, then the process is simpler, but the bent portion restores over time requiring repeated operations
Solution Approach 1:
The bending operation is performed in multiple periodic stages with different directions. After the initial bending, a second bending operation is applied in a different direction to set the pouch wing in its final configuration. This periodic multi-directional bending prevents shape restoration over time, ensuring stable bent geometry without requiring complex real-time adjustment mechanisms.
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 prevents cracks in the sealing part, significantly improving insulation resistance performance by maintaining a stable bent state and minimizing friction, resulting in improved battery cell reliability and reduced production losses.
Implementation Method 1
a pair of heating blades that apply heat and pressure in multiple directions to melt and bend the sealing part
Implementation Method 2
a pair of heating blades that apply heat and pressure in multiple directions to melt and bend the sealing part
Implementation Method 3
featuring a block-type bending part with inclined surfaces to maintain a stable 90-degree bend and prevent springback
Data Source
AI summary
The present invention relates to a pouch-type battery cell, a device for bending a pouch wing in the battery cell, and a method for bending a pouch wing in the battery cell, and specifically, relates to a pouch-type battery cell capable of improving insulation resistance performance of the battery cell by bending a pouch wing while heat-treating a sealing part of the pouch wing in the battery cell, thereby preventing and removing cracks in the sealing part, a device for bending a pouch wing in the battery cell, and a method for bending a pouch wing in the battery cell.