Pouch Battery Case Roller Flattening to Prevent Sheet Curling
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Solution Overview
Problem
The manufacturing process of pouch-type battery cases often results in residual stress and curling issues due to the formation of cup parts in the pouch sheet, leading to imbalance in weight distribution and subsequent curling of the pouch sheet.
Innovation Solution
An apparatus comprising a forming device for molding cup parts in a pouch sheet, along with first and second rollers that apply pressure to both sides of the pouch sheet to minimize curling and balance weight distribution, is used. The rollers have outer diameters that gradually change in thickness direction, and are arranged at a predetermined angle to effectively remove residual stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a cup part is formed in the pouch sheet using a forming device, then the pouch-type battery case structure is created, but residual stress concentrates and causes curling in the pouch sheet
Solution Approach 1:
A flattening device is introduced as an intermediary component between the forming device and the pouch sheet. This device includes first and second flattening members that press opposite surfaces of the pouch sheet at the cup part formation region, acting as a mediator to counterbalance the residual stress generated during cup part formation and prevent curling
Solution Approach 2:
The flattening members apply counteracting pressure to the pouch sheet surfaces in opposition to the curling force. By pressing both opposite surfaces of the pouch sheet at the cup part region, the system creates a counterbalancing force that neutralizes the residual stress-induced curling tendency
2Manufacturing precision
If the pouch sheet is pushed during cup part formation, then the cup part is molded, but curling occurs in the regions disposed at both sides of the cup part
Solution Approach 1:
The flattening device serves as an intermediary mechanism that intervenes during the cup part formation process. The flattening members press the pouch sheet surfaces simultaneously with or after the forming operation, mediating between the molding action and the final flatness requirement to prevent side region curling
Solution Approach 2:
The flattening members are positioned to apply pressure specifically at the cup part formation region and its surrounding areas. This localized pressing action targets the specific regions prone to curling without affecting the overall pouch sheet or other areas, maintaining local flatness where needed
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 apparatus effectively prevents curling and maintains even weight distribution across the pouch sheet, ensuring that the pouch-type battery cases are produced without the defects associated with residual stress and curling.
Implementation Method 1
a first roller disposed behind the forming device in a moving direction of the pouch sheet and rotating in contact with one surface of the pouch sheet; and a second roller disposed to face the first roller with the pouch sheet therebetween and rotating in contact with the other surface opposite to the one surface of the pouch sheet
Data Source
AI summary
An apparatus for manufacturing a pouch-type battery case according to an embodiment may be configured to mold a pouch sheet. The apparatus for manufacturing the pouch-type battery case may include a forming device configured to mold a cup part in the pouch sheet, a first roller disposed behind the forming device in a moving direction of the pouch sheet and rotating in contact with one surface of the pouch sheet, and a second roller disposed to face the first roller with the pouch sheet therebetween and rotating in contact with the other surface opposite to the one surface of the pouch sheet. Any one of the first roller and the second roller may have an outer diameter that gradually decreases inward in a thickness direction, and the other one of the first roller and the second roller may have an outer diameter that gradually increases inward in the thickness direction.