Cylindrical Battery Cap Assembly for Reliable External Welding
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Solution Overview
Problem
Existing secondary batteries lack a reliable and efficient method for facilitating welding with external devices, which is crucial for assembly and integration processes.
Innovation Solution
The design includes a cylindrical case with a cap assembly that features a terminal plate electrically connected to the cylindrical case, insulating gaskets, and a vent plate system with notches, allowing for secure electrical connections and easy welding with external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional cap assembly structure is used, then the battery structure is simple, but welding with external devices is difficult and unreliable
Solution Approach 1:
The cap assembly is segmented into multiple functional components: cap-up, terminal plate, first insulating gasket, vent plate, cap-down, and second insulating gasket. Each component serves a specific function, with the terminal plate providing a dedicated welding surface and the gaskets providing electrical insulation to ensure reliable and safe welding connections.
Solution Approach 2:
The terminal plate acts as an intermediary component between the cap-up and external devices, providing a dedicated welding interface. The insulating gaskets serve as intermediaries to electrically isolate the terminal plate from the cap-up, enabling safe welding operations while maintaining structural integrity.
2Productivity
If electrical connection components are added to facilitate welding, then welding efficiency is improved, but the risk of electrical short circuit increases
Solution Approach 1:
The first insulating gasket is positioned between the terminal plate and cap-up to electrically isolate them, preventing short circuits while allowing the terminal plate to serve as a welding interface. The second insulating gasket between the cap-down and cylindrical case provides additional electrical isolation, ensuring safe assembly operations.
Solution Approach 2:
Electrical insulation is applied locally at critical interfaces where electrical discharge could occur. The insulating gaskets are strategically placed only where needed to prevent short circuits, while maintaining good electrical contact elsewhere for efficient current flow during welding.
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure relates to a secondary battery capable of facilitating welding with an external device. As an example, disclosed is a secondary battery comprising: a cylindrical case; an electrode assembly accommodated in the cylindrical case; and a cap assembly sealing the cylindrical case and including a cap-up electrically connected to a positive electrode of the electrode assembly, a terminal plate coupled to an upper portion of the cap-up and electrically connected to a negative electrode of the electrode assembly, and a first insulating gasket interposed between the cap-up and the terminal plate.