Grooved Battery Connecting Plate for Stable Post 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 high reflectivity and an increased 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 penetrating welding is used to weld the connecting plate to the post, then the connection method is simple and efficient, but the high laser reflectivity of the connecting plate material makes it difficult to melt the materials quickly and causes unstable connection
Solution Approach 1:
The patent changes the surface parameter of the connecting plate by creating a rough surface with grooves in the welding area. This surface modification increases the laser absorption rate and decreases laser reflectivity, enabling efficient melting and stable welding connection while maintaining the overall simplicity of the laser penetrating welding process
Solution Approach 2:
The patent applies local surface treatment (roughening with grooves) only to the welding area of the connecting plate rather than the entire plate. This localized modification improves laser absorption precisely where needed for welding, while preserving the original material properties in other areas, thus achieving stable connection without compromising overall welding efficiency
2Ease of manufacture
If the connecting plate has a smooth surface, then the manufacturing process is simple, but the laser absorption rate is low and the connection strength is insufficient
Solution Approach 1:
The patent modifies the surface parameter (roughness) of the connecting plate in the welding area by creating grooves through stamping. This changes the surface characteristics to increase laser absorption rate, thereby improving connection strength while maintaining relatively simple manufacturing through stamping processes
Solution Approach 2:
The patent replaces complex surface treatment methods (such as mechanical grinding or chemical etching) with a stamping process that uses protrusions to create grooves. This substitution maintains manufacturing simplicity while achieving the desired surface roughness for improved laser absorption and connection strength
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 stable and durable connection between the connecting plate and the 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
the main connection method is using laser penetrating welding to weld the connecting plate to the surface of the post
Data Source
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.