Battery Case Forming via Pneumatic Sheet Stretching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for manufacturing battery cases with deep storage parts face challenges such as appearance defects like pin-holes and cracks due to high frictional forces when stretching laminate sheets, making it difficult to form deep storage parts for high-capacity electrode assemblies.
Innovation Solution
A manufacturing device using air pressure to stretch laminate sheets instead of direct pressing, with a system comprising a first mold, a second mold, and an air pressure regulator to minimize frictional force and prevent defects, allowing for deeper storage part formation without cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a punch presses the laminate sheet downward to form deep storage parts, then the storage part depth is increased, but appearance defects such as pin-holes and cracks occur on the outer surface
Solution Approach 1:
The patent replaces the mechanical pressing system (punch) with a pneumatic system (air pressure). The air pressure acts on the laminate sheet through a mold cavity, causing the sheet to expand and form deep storage parts without direct mechanical contact, thereby eliminating friction-induced defects while achieving the required depth
Solution Approach 2:
The patent applies pneumatic pressure to inflate the laminate sheet into the mold cavity. By controlling the air pressure, the laminate sheet is gradually expanded to form deep storage parts without the high frictional forces that would cause pin-holes and cracks during mechanical pressing
2Ease of manufacture
If direct pressing with a punch is used to stretch the laminate sheet, then the storage part is formed, but high frictional force causes appearance defects
Solution Approach 1:
The patent substitutes the mechanical pressing action with pneumatic pressure. The air pressure transmits force through the mold cavity to the laminate sheet, eliminating the need for direct mechanical contact and the associated high frictional forces that cause defects
Solution Approach 2:
The patent introduces air pressure as an intermediary between the mold and the laminate sheet. This intermediary medium transmits the forming force without direct contact, reducing frictional force to near-zero levels and preventing appearance defects
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 method effectively reduces frictional force during stretching, enabling the formation of deeper storage parts with reduced defects, such as cracks and pinholes, and offers a more compact and economically advantageous manufacturing process.
Implementation Method 1
an air pressure regulator increasing or decreasing an air pressure in the second space part through the through-hole to stretch and modify the laminate sheet into a shape corresponding to the first space part or the second space part
Data Source
AI summary
The present invention provides a manufacturing device of a battery case including a first mold including a first space part having a shape corresponding to a storage part formed therein; a second mold including a second space part having a shape corresponding to the storage part and a through-hole communicating with the second space part formed therein, and coupled to the first mold with a laminate sheet interposed therebetween; and an air pressure regulator mounted in the through-hole in a state in which the first space part and the second space part are isolated from the outside, and increasing or decreasing an air pressure of the second space part through the through-hole to stretch and modify the laminate sheet into a shape corresponding to the first space part or the second space part.