Current Collection Plate Structure for Accurate Battery Welding
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Solution Overview
Problem
The existing secondary battery technology faces challenges in easily welding electrode assemblies to current collection plates while ensuring safety and preventing short circuits.
Innovation Solution
A secondary battery design featuring a current collection plate with a concave-convex structure that widens from the center to the periphery, allowing for consistent compaction and improved weldability, along with a position identification part for enhanced welding accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flat current collection plate is used for welding, then the welding process is simple, but the compaction level of the electrode uncoated part is inconsistent leading to poor weldability
Solution Approach 1:
The current collection plate is designed with a concave-convex structure where the welding surface has localized convex portions that correspond to the electrode uncoated part. This creates non-uniform local geometry on an otherwise simple plate structure, enabling consistent compaction and improved weldability without completely redesigning the entire plate.
Solution Approach 2:
The concave-convex structure is pre-formed on the current collection plate before the welding process. This preliminary structural preparation ensures that when the electrode assembly is placed, the uncoated part is automatically positioned and compacted consistently, eliminating the need for additional compaction steps and improving welding readiness.
2Manufacturing precision
If welding position identification is not provided, then the device structure is simple, but welding position accuracy is poor leading to short circuits
Solution Approach 1:
The position identification part uses visual contrast (analogous to color changes) through embossed or engraved features that differ in appearance from the surrounding plate surface. This allows welding equipment or operators to easily distinguish the correct welding position without adding complex electronic or mechanical identification systems.
Solution Approach 2:
The current collection plate is segmented into distinct functional zones: the welding surface with concave-convex structure, the position identification part with embossed/engraved features, and the through-holes. This segmentation allows each zone to perform its specific function independently, improving welding position accuracy without making the entire plate overly complex.
3Reliability
If the electrode uncoated part is not pressurized, then the manufacturing process is simple, but the weldability and safety are poor due to inconsistent compaction
Solution Approach 1:
The electrode uncoated part is pressurized and flattened in advance during the electrode assembly manufacturing process, before the final welding step. This preliminary compaction ensures consistent geometry and contact pressure during welding, improving reliability and safety without requiring complex real-time pressure control during assembly.
Solution Approach 2:
Pressurization is applied locally to the electrode uncoated part rather than uniformly to the entire electrode assembly. This localized compaction focuses on the specific welding interface area, ensuring consistent weldability where needed while maintaining manufacturing simplicity for the rest of the electrode structure.
Data Source
AI summary
The present invention relates to a secondary battery in which an electrode assembly and a current collection plate may be easily welded and safety may be improved. As an embodiment, disclosed is a secondary battery comprising: an electrode assembly which is formed by winding a first electrode plate having a first electrode uncoated part, a separator, and a second electrode plate having a second electrode uncoated part, the first electrode uncoated part protruding upwards, and the second electrode uncoated part protruding downwards; and a first current collection plate which is electrically connected to the first electrode uncoated part and has a concave-convex part protruding downwards, wherein the width of the concave-convex part becomes wider from the center of the first current collection plate toward the outer periphery thereof.