Unit Cell Separator Cutting With Heating Wire to Prevent Folding
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Solution Overview
Problem
In the manufacturing of unit cells for secondary batteries, the existing methods often result in separators being folded during the cutting process, leading to potential short circuits when the units are stacked, as the pressure applied by traditional cutters can cause the separators to fold in the direction of the applied force.
Innovation Solution
An apparatus comprising a lower and upper block with protrusions and recessed grooves, where a heating wire cutter, typically made of nichrome wire, is used to cut the separators while applying heat, minimizing physical pressure and ensuring the separators are bonded and sealed before cutting, thereby preventing folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional cutter applies vertical pressure to cut the separators, then the cutting action is effective, but the separators are folded in the direction of the applied pressure
Solution Approach 1:
The patent replaces the traditional mechanical cutter that applies vertical pressure with a heating wire cutter that uses thermal energy to cut the separators. The heating wire cutter applies heat to melt and sever the separator material without exerting significant mechanical pressure, thereby avoiding the folding problem while maintaining effective cutting.
Solution Approach 2:
The patent changes the cutting parameter from mechanical pressure to thermal energy. Instead of applying force to cut the separators, the system uses a heated wire to melt and cut the material. This parameter change eliminates the folding issue caused by vertical pressure while achieving the desired cutting result.
2Device complexity
If the separators are cut before bonding, then the cutting process is simpler, but the separators may be folded during cutting
Solution Approach 1:
The patent performs bonding (sealing) of the separators to the electrodes before the cutting operation. By securing the separators in place through bonding first, the structure becomes stable and resistant to folding during the subsequent heating wire cutting process. This sequence of operations prevents folding while maintaining process simplicity.
Solution Approach 2:
The patent applies preliminary bonding action to prevent the folding that would occur during cutting. By sealing the separators to the electrodes before cutting, the system creates a stable structure that resists the forces applied during the heating wire cutting process, thereby preventing folding in advance.
3Productivity
If the separators are not properly bonded before cutting, then the bonding process is faster, but the separators fold during cutting
Solution Approach 1:
The patent replaces mechanical pressure cutting with thermal cutting using a heating wire. This substitution allows for faster bonding processes without compromising separator integrity, because the thermal cutting method does not exert the vertical pressure that causes folding, even when bonding is not perfectly optimized.
Solution Approach 2:
The patent changes the cutting mechanism from pressure-based to heat-based, which allows for increased bonding speed. The thermal cutting process is less sensitive to bonding quality and does not cause folding even when bonding is performed quickly, thereby enabling higher productivity without the folding problem.
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 use of a heating wire cutter reduces the likelihood of separator folding, ensuring proper bonding and cutting, which prevents short circuits and enhances the manufacturing process by maintaining the integrity of the separators during unit cell production.
Implementation Method 1
a heating wire cutter, typically made of nichrome wire, is used to cut the separators while applying heat
Data Source
AI summary
The present invention relates to an apparatus for manufacturing a unit cell, comprising: a first separator and a second separator configured to move in a longitudinal direction, the first and second separators configured to be cut at intervals between adjacent electrodes; a first positioned on a first side of the first and second separators, the first block including a pair of protrusions defining a recessed groove therebetween on a surface of the first block; a second block positioned on a second side of the first and second separators opposite the first side and aligned with the first block along an axis, the second block including a pair of protrusions defining a recessed groove therebetween on a surface of the second block; and a heating wire cutter disposed in any one of the recessed groove of the first block or the recessed groove of the second block.