Battery Connecting Plate Rough Surface for Stable Laser Welding
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Solution Overview
Problem
The difference in materials between the connecting plate and the post in lithium batteries leads to unstable connections during laser welding due to varying laser reflectivity and absorption rates, resulting in a risk of detachment.
Innovation Solution
A connecting plate with a post connecting part featuring a rough surface and grooves of varying shapes and sizes, and a punch with stamping protrusions to create these features, enhancing laser absorption and improving machinability for stable connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser welding is used to connect the connecting plate to the post, then the connection method is simple and efficient, but the connection stability is poor due to high laser reflectivity and low absorption rate caused by material differences
Solution Approach 1:
The patent applies local quality by creating a rough surface treatment specifically at the welding area of the connecting plate, while leaving other areas unchanged. This localized surface modification with grooves of different shapes and sizes increases laser absorption precisely where needed, without affecting the overall structure or other functional areas of the connecting plate.
Solution Approach 2:
The patent changes the surface parameter (roughness) of the welding area by introducing grooves with varying shapes and sizes. This parameter change increases the surface area and creates multiple reflections, transforming the smooth high-reflectivity surface into a rough high-absorption surface, thereby improving laser coupling and welding reliability.
2Ease of manufacture
If a smooth surface is used on the connecting plate, then the manufacturing process is simple, but the laser absorption rate is low making welding difficult
Solution Approach 1:
The patent applies preliminary action by pre-treating the surface of the connecting plate at the welding area before the actual laser welding process. The rough surface with grooves is created in advance through stamping or other forming methods, ensuring that when laser welding occurs, the surface is already optimized for maximum laser absorption, thus preventing welding failures rather than correcting them afterward.
3Adaptability or versatility
If the connecting plate material differs from the post material, then design flexibility is improved, but laser reflectivity increases making welding unstable
Solution Approach 1:
The patent addresses material incompatibility issues by applying local quality - treating only the welding area with a rough surface pattern while maintaining the base material properties elsewhere. This localized treatment compensates for the inherent laser reflectivity issues caused by material differences, allowing diverse material combinations to be welded effectively without sacrificing design flexibility.
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 solution enhances connection strength and reduces the risk of detachment by improving laser absorption and machinability, ensuring a robust and durable connection between the connecting plate and post.
Implementation Method 1
the rough surface can increase a surface refractive index of the welding area and improve a laser absorption rate of the welding area
Implementation Method 2
improve a laser absorption rate of the welding area, so that the post connecting part in the welding area can be quickly melted and connected
Implementation Method 3
the post connecting part in the welding area can be quickly melted and connected
Implementation Method 4
the main connection method is using laser penetrating welding to weld the connecting plate to the surface of the post
Data Source
Figure 1
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AI summary
A connecting plate, a battery and a punch are provided. The connecting plate includes a tab connecting part and a post connecting part. The post connecting part is connected to one side of the post connecting part, and the post connecting part is provided with a welding area configured to be in contact with a welding laser. The post connecting part in the welding area 103 is provided with a rough surface, and the rough surface is provided with a plurality of grooves with different shapes and/or sizes