Sealing Member Pre-Correction for Power Storage Device Warpage
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Solution Overview
Problem
The warpage displacement of the sealing member in power storage devices is not sufficiently suppressed due to the lower rigidity of the sealing member compared to the current collector terminal, leading to asymmetric displacement and affecting the accuracy requiring surfaces, such as sensor contact surfaces, which need precise surface positioning.
Innovation Solution
A method involving the creation of correlation graph data between warpage displacement and corrective deformation amounts for the sealing member, allowing for precise correction of the sealing member before welding, ensuring the accuracy requiring surfaces meet the required reference values.
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 warpage
Solution Approach 1:
The sealing member is corrected in advance before welding to the case by applying a load that generates corrective deformation opposite to the expected warpage direction. This preliminary correction ensures that when the sealing member is subsequently welded and subjected to external forces, the accuracy requiring surface maintains its position within the reference value.
Solution Approach 2:
A load is applied to the sealing member to generate corrective deformation that counteracts the expected warpage displacement. The corrective deformation is calculated based on the relationship between warpage displacement amount and corrective deformation amount, creating an opposite effect that prevents the accuracy requiring surface from deviating beyond the reference value when external forces are applied during welding.
2Adaptability or versatility
If the sealing member has lower rigidity to improve sealing flexibility, then sealing adaptability is improved, but warpage displacement increases affecting surface position accuracy
Solution Approach 1:
The sealing member is corrected in advance before welding to the case by applying a load that generates corrective deformation opposite to the expected warpage direction. This preliminary correction ensures that when the sealing member is subsequently welded and subjected to external forces, the accuracy requiring surface maintains its position within the reference value.
Solution Approach 2:
The rigidity of the sealing member is maintained at a lower level for sealing flexibility, but the surface position accuracy is controlled by applying corrective deformation through external loading. The corrective deformation amount is adjusted based on the relationship between warpage displacement and corrective deformation, allowing the sealing member to remain flexible while achieving the required surface position accuracy.
3Manufacturing precision
If corrective deformation is applied to the sealing member before welding, then surface position accuracy is improved, but the manufacturing process complexity increases
Solution Approach 1:
The sealing member is corrected in advance before welding to the case by applying a load that generates corrective deformation opposite to the expected warpage direction. This preliminary correction ensures that when the sealing member is subsequently welded and subjected to external forces, the accuracy requiring surface maintains its position within the reference value.
Solution Approach 2:
The corrective deformation amount is determined based on the measured warpage displacement amount and the pre-established relationship between warpage displacement and corrective deformation. This feedback mechanism allows the manufacturing process to automatically adjust the corrective deformation to achieve the required surface position accuracy without requiring complex real-time control systems.
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
This method ensures the accuracy requiring surfaces, such as sensor contact surfaces, achieve the necessary surface position accuracy, enhancing the reliability and safety of the power storage device by correcting warpage displacement effectively.
Implementation Method 1
corrective deformation amount by which the accuracy requiring surface displaced by the warpage displacement amount is subjected to corrective deformation toward an opposite side in the front-back direction to a displacement direction of the accuracy requiring surface relative to the support point until the accuracy requiring surface reaches a position from which the accuracy requiring surface can be restored by its own elastic force to a normal position
Data Source
AI summary
A method for manufacturing a power storage device includes accumulating correlation graph data between a warpage displacement amount of a sealing member with respect to a support point in a front-back direction of the accuracy requiring surface and a corrective deformation amount of the accuracy requiring surface corrected by deformation in an opposite direction to the front-back direction until a position at which the accuracy requiring surface can restore by its own elastic force to a normal position, measuring a warpage displacement amount, and determining whether or not the warpage displacement amount satisfies a reference value. Correcting the sealing member includes applying a load to the accuracy requiring surface determined to fail to satisfy the reference value until a position corresponding to a corrective deformation amount determined when the measured warpage displacement amount coincides with the warpage displacement amount in the correlation graph data, and then removing the load.