Battery Sealing Cap Weld Positioning for Stable Nickel-Hydrogen Seals
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Solution Overview
Problem
Existing destructive inspections for sealing bodies in nickel-hydrogen secondary batteries are prone to individual differences, leading to high rates of wrong determinations and inefficient welding adjustments, which can result in unnecessary operations and potential defects.
Innovation Solution
The sealing body design includes a positive electrode cap with a specified position for welded parts between the sealing plate and flange, where the ratio of X to R (length from the welded part edge to the flange's outer circumference) is 0% to 2%, ensuring stable welding quality by minimizing individual variation and scar formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flange is welded to the sealing plate to ensure structural integrity, then the welding strength is improved, but the risk of weld defects and individual variations increases
Solution Approach 1:
The patent specifies a particular welding position defined by the ratio X/R (distance from flange outer circumference to welded part edge divided by flange radius) being 0% to 2%. This local positioning ensures optimal welding quality at a specific location on the flange, reducing individual variations and defects while maintaining welding strength.
2Measurement precision
If destructive inspection is performed to detect weld defects, then the detection accuracy is improved, but the inspection time and operational complexity increase
Solution Approach 1:
The patent performs preliminary positioning of the welding area by defining the X/R ratio parameter before welding occurs. This preliminary action ensures that welding is performed at the optimal position from the start, preventing defects rather than just detecting them, thereby reducing the need for time-consuming destructive inspections.
3Ease of manufacture
If the welding position is not precisely controlled, then the manufacturing process is simpler, but the individual differences in welding quality increase
Solution Approach 1:
The patent introduces a specific parameter X/R ratio (where X is the distance from the flange outer circumference to the welded part edge, and R is the flange radius) and constrains it to 0% to 2%. This parameter control provides a simple yet effective method to ensure consistent welding quality without complicating the manufacturing process.
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 design enhances the accuracy of welding inspections, reduces unnecessary adjustments, and stabilizes the manufacturing process, resulting in high-quality batteries with reduced defects and improved efficiency.
Implementation Method 1
the flange of the positive electrode cap is, for example, resistance-spot welded to the sealing plate
Implementation Method 2
the valve body is elastically deformed due to the pressure of the gas, to open the exhaust hole of the sealing plate
Data Source
AI summary
Provided is a nickel-hydrogen secondary battery comprising a sealing body that seals an opening of an outer can, the sealing body includes a sealing plate, and a positive electrode cap welded to the sealing plate, the positive electrode cap includes a cylindrical body section, an annular flange provided along a circumferential edge of an opening located at a base end of the body section, and a top wall provided to close a tip opposite to the base end, and a welded part between the sealing plate and the positive electrode cap is located at a position where a ratio of X to R in percentage is 0% or more and 2% or less, in which R is a length from a center C of the flange to an outer circumferential edge of the flange, and X is a length from an edge of the welded part on an outer side in a radial direction of the flange to the outer circumferential edge of the flange.