Sealing Member Correction for Accurate Power Storage Sensor Positioning
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Solution Overview
Problem
The sealing member in power storage devices experiences asymmetric surface displacement due to deformation of the current collector terminal, leading to inaccurate positioning of accuracy requiring surfaces, which affects the reliability and measurement accuracy of temperature sensors.
Innovation Solution
A method to correct the sealing member by adjusting its surface position and displacement amount before welding, using load application and elastic deformation to ensure the accuracy requiring surfaces meet a reference value, thereby stabilizing the sealing member's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the current collector terminal is enhanced to reduce deformation, then the deformation of the current collector terminal is reduced, but the external force is directly transmitted to the sealing member causing surface displacement of the accuracy requiring surface
Solution Approach 1:
The sealing member is corrected in advance before welding to the case by applying a load that creates elastic deformation. This preliminary correction ensures that when the sealing member is later welded and subjected to external forces, the accuracy requiring surface maintains its position within the reference value. The correction is performed by displacing the accuracy requiring surface in the opposite direction of the expected displacement caused by current collector terminal deformation.
Solution Approach 2:
The surface position of the accuracy requiring surface is adjusted by changing the physical state of the sealing member through elastic deformation. By applying a controlled load that creates elastic deformation, the surface position is temporarily changed to compensate for expected future displacement. The elastic deformation amount is calculated based on the reference value and measured surface displacement, allowing precise control of the correction process.
2Manufacturing precision
If the sealing member is made more rigid to prevent surface displacement, then the surface position accuracy is improved, but the sealing member cannot be corrected by elastic deformation
Solution Approach 1:
The sealing member is designed with controlled rigidity that allows elastic deformation under correction loads. The rigidity is optimized to be sufficient for maintaining surface position accuracy during operation but flexible enough to permit corrective elastic deformation during manufacturing. This parameter optimization enables the sealing member to exhibit elastic behavior when needed for correction while maintaining structural integrity during use.
Solution Approach 2:
The correction process is performed as a preliminary action before welding, when the sealing member is still accessible and can be deformed elastically. By performing the correction before the sealing member is permanently fixed to the case, the process exploits the temporary flexibility of the sealing member to achieve the desired surface position adjustment.
3Manufacturing precision
If the surface position of the accuracy requiring surface is corrected by applying load, then the surface displacement amount is reduced within reference value, but additional manufacturing steps are required
Solution Approach 1:
The correction step is integrated into the manufacturing process as a preliminary action performed before welding. By combining the correction operation with the existing manufacturing sequence, the process adds minimal complexity. The correction is performed once the sealing member is positioned in the case but before permanent fixation, utilizing the same equipment and process flow as much as possible.
Solution Approach 2:
The correction process uses feedback from surface position measurements to determine the appropriate load to apply. The surface position is measured, compared against the reference value, and the correction load is calculated based on the deviation. This feedback mechanism ensures that the correction is precisely targeted and avoids over-correction, simplifying the overall process by making it adaptive rather than requiring multiple trial steps.
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
Ensures accurate positioning of sensor contact surfaces within a required reference value, enhancing the reliability and safety of power storage devices by stabilizing the sealing member's displacement.
Implementation Method 1
a corrective deformation amount determined by addition of the surface displacement amount and an elastic deformation amount that allows the sealing member to restore by its own elastic force
Data Source
AI summary
In a method for manufacturing a power storage device, when a surface position of an accuracy requiring surface of a sealing member is located on a back surface side relative to a support point, the surface position is displaced toward a front surface side in advance. It is determined whether a surface displacement amount of the accuracy requiring surface relative to the support point satisfies a required reference value. When the surface displacement amount is determined to not satisfy the reference value, the sealing member is corrected by a load applied to the accuracy requiring surface until a position corresponding to a corrective deformation amount determined by adding the surface displacement amount and an elastic deformation amount allowing the sealing member to restore by its own elastic force to a normal position at which the surface displacement amount is zero, and then the load is removed.