Battery Pouch Forming with Pre-Cooling for Deeper Draws
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Solution Overview
Problem
The existing pouch forming process for pouch-type secondary batteries faces challenges with friction and cracking due to the use of aluminum layers, leading to increased pressure loads and reduced sliding performance during deep forming.
Innovation Solution
A pouch forming device equipped with a cold unit to lower the temperature of the pouch sheet before forming, combined with a forming unit that includes a die, punch, and stripper, to minimize friction and improve lubrication during the deep forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If deep forming of the pouch sheet is performed, then the accommodating part is successfully formed, but friction increases and sliding performance deteriorates
Solution Approach 1:
The pouch sheet is cooled down before the forming process to advance prepare the lubricant for optimal performance. This preliminary cooling action prevents friction increase during deep forming by ensuring the lubricant is in the best state to reduce friction from the start of the forming operation.
Solution Approach 2:
The temperature of the pouch sheet is changed as a parameter to optimize lubricant performance. By controlling the temperature before forming, the lubricant's physical properties are adjusted to provide better slipperiness and reduced friction during the deep forming process, allowing greater forming depth without deteriorating sliding performance.
2Manufacturing precision
If deep forming of the pouch sheet is performed, then the accommodating part is successfully formed, but pressure load increases
Solution Approach 1:
Cooling the pouch sheet before forming is a preliminary action that prepares the material and lubricant for the forming operation. This advance preparation reduces the resistance to forming, thereby reducing the pressure load required to achieve the desired forming depth.
Solution Approach 2:
By changing the temperature parameter of the pouch sheet before forming, the material's mechanical properties and the lubricant's effectiveness are optimized. This parameter change reduces friction and material resistance, allowing deep forming to be achieved with lower pressure loads.
3Strength
If aluminum layer is used in the pouch sheet, then structural integrity is maintained, but cracks are generated during deep forming
Solution Approach 1:
The temperature of the pouch sheet is changed as a critical parameter before forming. This temperature control optimizes the ductility and formability of the aluminum layer, allowing deep forming to proceed without generating cracks while maintaining the structural integrity provided by the aluminum layer.
Solution Approach 2:
Cooling the pouch sheet with the aluminum layer before forming is a preliminary action that prepares the material for deformation. This advance cooling optimizes the material's response to forming, preventing crack generation in the aluminum layer while preserving its structural integrity.
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 proposed solution effectively increases the lubricant amount on the pouch sheet, reduces friction during deep forming, and minimizes the pressure load required, thereby enhancing the critical forming depth and energy density of the battery cell.
Implementation Method 1
by lowering the temperature of the pouch sheet in advance upon forming process of the pouch sheet
Implementation Method 2
the temperature control part may be provided to supply compressed air into the space part
Data Source
AI summary
A pouch forming device includes a cold unit for cold-working a pouch sheet, and a forming unit. In a pouch forming method using the pouch forming device, the pouch sheet passes through the cold unit and then is supplied to the forming unit for forming an accommodating part to accommodate an electrode assembly.