Magnetic Cap Positioning for Secondary Cell Welding
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Solution Overview
Problem
In secondary cell manufacturing, the cap used to cover the liquid injection hole during welding is prone to displacement or disengagement due to external forces, leading to potential contamination of the cell with welding spatter and resin, which can cause short-circuits and performance issues.
Innovation Solution
A magnetic cap positioning system using first and second magnetic bodies to hold the cap in place over the liquid injection hole, preventing displacement and disengagement without the need for adhesives, allowing for easy attachment and detachment and repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cap is disposed to cover the liquid injection hole before welding, then the liquid injection hole is protected from welding spatter, but the cap may be displaced or disengaged due to external forces during welding and transfer
Solution Approach 1:
The cap is disposed to cover the liquid injection hole before the welding step, and the lid member is disposed to cover the opening of the outer case before welding. This preliminary positioning ensures the cap is in place to prevent welding spatter from entering the liquid injection hole during the welding process.
Solution Approach 2:
The lid member acts as an intermediary component that is disposed between the cap and the outer case opening. By disposing the lid member to cover the opening, it provides structural support and helps maintain the cap's position, preventing displacement and disengagement during welding and transfer operations.
2Reliability
If adhesive is used to fix the cap to the lid member, then the cap position is stabilized, but the adhesive may remain on the lid member after cap removal and the tape cannot be repeatedly used
Solution Approach 1:
The adhesive is extracted from the system by removing the step of disposing adhesive on the lid member. Instead, the cap is held in position by the geometric fit between the cap's opening and the lid member's liquid injection hole, eliminating the need for adhesive and the associated cleanup issues.
Solution Approach 2:
The invention avoids using disposable adhesive tapes by implementing a reusable cap system. The cap can be removed and reinstalled multiple times without degradation, as it is held in position by the structural fit rather than adhesive, allowing for repeated use in the manufacturing process.
3Ease of operation
If no adhesive is used to attach the cap, then the cap can be easily removed and reused, but the cap is prone to displacement and disengagement during welding and transfer
Solution Approach 1:
The cap and lid member are preliminarily positioned to fit together before welding begins. The cap's opening is aligned with the liquid injection hole, and the lid member is disposed to cover the outer case opening, creating a stable configuration that maintains cap position without requiring adhesive for attachment.
Solution Approach 2:
The lid member serves as an intermediary structure that provides geometric constraints to the cap. By disposing the lid member to cover the opening, it creates a fitting relationship that stabilizes the cap position during welding and transfer while still allowing for easy removal and reuse when 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 magnetic cap positioning system effectively prevents foreign substances from entering the cell, ensuring accurate cap placement and reducing the risk of short-circuits and performance degradation during welding and transfer processes.
Implementation Method 1
bringing close to each other the first magnetic body and a second magnetic body that applies a magnetic force to the first magnetic body, such that a position of the cap that is disposed to cover the liquid injection hole is held by the magnetic force between the first magnetic body and the second magnetic body
Data Source
AI summary
A secondary cell manufacturing method includes the steps of: disposing a cap including a magnetic body so as to cover a liquid injection hole provided in a lid member; disposing the lid member so as to cover an opening of an outer case; and bringing close to each other the magnetic body and a magnetic body that applies a magnetic force to the magnetic body, and so holding the position of the cap that is disposed to cover the liquid injection hole by the magnetic force applied from the magnetic body to the magnetic body.