Cylindrical Battery Cap-Up Plating for Weld Defect Reduction
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Solution Overview
Problem
Non-uniform plating thickness distribution in the cap-up of cylindrical rechargeable batteries leads to welding defects, affecting productivity and increasing manufacturing costs.
Innovation Solution
The cap-up is plated in a reel-to-reel manner to form a uniform plating layer, excluding the edge where the safety vent is bent, and the edge is processed to be either inclined or rounded to prevent irregular unplated regions, ensuring the safety vent seals the unplated area and prevents moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cap-up is plated using conventional methods, then the plating process can be completed, but the plating thickness distribution becomes non-uniform leading to welding defects
Solution Approach 1:
The edge of the cap-up is processed (inclined or rounded) before the plating process to create a favorable surface geometry. This preliminary edge treatment ensures that the plating solution can uniformly deposit metal on the cap-up surface, preventing non-uniform plating thickness and subsequent welding defects.
Solution Approach 2:
The invention applies different treatments to different parts of the cap-up: the edge portion receives special processing (inclining or rounding) while the main body receives standard plating. This local differentiation ensures optimal plating thickness distribution across the entire cap-up surface, with particular attention to the edge area that is most prone to non-uniform plating.
2Manufacturing precision
If the plating layer is formed on the entire cap-up surface, then complete coverage is achieved, but irregular unplated regions occur at the edge affecting welding quality
Solution Approach 1:
The cap-up edge is pre-processed to an inclined or rounded shape before plating. This preliminary geometric modification eliminates irregularities that would cause unplated regions during the plating process, ensuring complete and uniform plating coverage across the entire cap-up surface including the edge areas.
Solution Approach 2:
The invention changes the geometric parameters of the cap-up edge (creating inclines or rounds) to optimize the plating process. This parameter modification ensures that the plating solution can access and uniformly deposit metal on all surfaces, eliminating unplated regions that would otherwise occur at sharp or irregular edges.
3Ease of manufacture
If the safety vent is not bent to surround the unplated region, then the assembly process is simpler, but moisture can ingress through the unplated area causing corrosion
Solution Approach 1:
The bent safety vent acts as an intermediary protective element that surrounds and shields the unplated region of the cap-up edge. By bending the safety vent to envelop this area, it creates a physical barrier that prevents moisture from reaching the unplated metal surface, thereby preventing corrosion without complicating the assembly process.
Solution Approach 2:
The safety vent is designed and positioned to preemptively protect the unplated region from moisture ingress. The bent configuration of the safety vent creates a protective shield around the vulnerable unplated area before moisture can cause corrosion, implementing a preliminary defensive measure against environmental damage.
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 approach reduces welding defects, enhances productivity, and lowers manufacturing costs by ensuring a uniform plating layer and effective sealing against moisture.
Implementation Method 1
forming a plating layer by plating the surface of the cap-up in a reel-to-reel manner
Data Source
AI summary
A cylindrical rechargeable battery of the present disclosure includes a cylindrical can, an electrode assembly accommodated in the cylindrical can, and a cap assembly coupled to the cylindrical can to seal the electrode assembly, wherein the cap assembly includes a cap-up including a plating layer having an unplated region and a safety vent located below the cap-up and partially bent to surround the unplated region at an edge of the cap-up.