Battery Cell Pressing Jig for Lead Tab Edge Gas Removal
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Solution Overview
Problem
Conventional battery cell pressurizing devices fail to efficiently remove gas from the edge portion of the battery cell adjacent to the lead tab, leading to deformation, reduced insulation resistance, and potential electrolyte leakage, affecting battery performance and productivity.
Innovation Solution
A battery cell pressurizing jig with individually pressurizable regions for the electrode assembly and lead tab regions, using block portions on pressurizing plates to prevent gas from moving to the edge portion and improve gas removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional pressurizing device pressurizes the central portion of the battery cell, then gas is pushed toward the periphery, but gas accumulates at the edge portion adjacent to the lead tab causing deformation and reduced insulation resistance
Solution Approach 1:
The pressurizing device is divided into multiple pressurizing portions (first pressurizing portion for central region, second pressurizing portion for edge region) that can independently apply pressure to different areas of the battery cell. This segmentation allows gas to be pushed from the center toward the periphery without accumulating at the edge portion adjacent to the lead tab, thereby maintaining insulation resistance while improving gas removal efficiency.
Solution Approach 2:
Different pressurizing portions are applied to different regions of the battery cell based on local requirements. The first pressurizing portion applies pressure to the central portion where gas generation is highest, while the second pressurizing portion applies pressure to the edge region to prevent gas accumulation near the lead tab. This localized pressurizing strategy optimizes gas removal while protecting critical areas.
2Productivity
If gas is not efficiently removed from the battery cell, then gas occupies space inside the cell, but this causes deformation of the battery and adversely affects battery performance and life
Solution Approach 1:
The pressurizing device is divided into multiple pressurizing portions (first pressurizing portion for central region, second pressurizing portion for edge region) that can independently apply pressure to different areas of the battery cell. This segmentation allows gas to be pushed from the center toward the periphery without accumulating at the edge portion adjacent to the lead tab, thereby maintaining insulation resistance while improving gas removal efficiency.
Solution Approach 2:
The pressurizing device applies pressure in advance during the activation process to prevent gas accumulation before it causes deformation. By actively pushing gas toward the periphery and preventing it from occupying excessive space inside the cell, the device maintains the battery's shape and performance throughout the activation process.
3Reliability
If gas accumulates at the edge portion adjacent to the lead tab, then insulation resistance is reduced and electrolyte may leak, but efficient gas removal is needed to maintain battery performance
Solution Approach 1:
The pressurizing device is divided into multiple pressurizing portions (first pressurizing portion for central region, second pressurizing portion for edge region) that can independently apply pressure to different areas of the battery cell. This segmentation allows gas to be pushed from the center toward the periphery without accumulating at the edge portion adjacent to the lead tab, thereby maintaining insulation resistance while improving gas removal efficiency.
Solution Approach 2:
Different pressurizing portions are applied to different regions of the battery cell based on local requirements. The first pressurizing portion applies pressure to the central portion where gas generation is highest, while the second pressurizing portion applies pressure to the edge region to prevent gas accumulation near the lead tab. This localized pressurizing strategy optimizes gas removal while protecting critical areas.
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
Prevents gas from accumulating at the edge of the battery cell, enhances gas removal efficiency, and maintains insulation integrity, thereby improving battery performance and reducing the risk of deformation and electrolyte leakage.
Implementation Method 1
The gas (G) generated during the activation process is discharged to the outside of the battery cell (10) through the degas hole (18) of the gas pocket (17). At this time, the pouch-type battery cell (10) is pressurized with a predetermined force (F1, F2) by a battery cell pressurizing device (20) so that the gas (G) can be smoothly discharged to the outside of the battery cell (10).
Data Source
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AI summary
A battery cell pressurizing jig related to one example of the present invention comprises a first pressurizing part for pressurizing one surface of a battery cell including an electrode assembly, a pair of lead tabs electrically connected to the electrode assembly, and a cell case surrounding the electrode assembly, and a second pressurizing part disposed to face the first pressurizing part and for pressurizing the other surface of the battery cell, wherein the first pressurizing part comprises a first assembly block portion provided to pressurize an assembly region where the electrode assembly is disposed on one surface of the battery cell, and a pair of first tap block portions each provided to pressurize a pair of lead tab regions including a boundary region between each lead tab and the cell case.