Secondary Battery Rivet Injection Port for Sealing and Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face challenges in ensuring sealability and defect detection at the injection port, which is often sealed with a blind rivet, making manufacturing expensive and difficult.
Innovation Solution
The design includes an injection port on the positive electrode with a rivet terminal that has a rivet injection hole, allowing for electrolyte injection and defect detection, and uses a welding line to connect the rivet terminal to the current collector plate, enhancing structural integrity and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection port is sealed with a blind rivet, then the injection port is sealed, but it becomes difficult to ensure sealability and inspect defects
Solution Approach 1:
A sealing ring is introduced as an intermediary component between the blind rivet and the injection port. The sealing ring provides a dedicated sealing surface that enhances sealability while allowing the injection port to remain accessible for defect inspection, thus resolving the contradiction between sealing effectiveness and inspectability
2Reliability
If the injection port is sealed with a blind rivet, then the injection port is sealed, but manufacturing becomes expensive
Solution Approach 1:
The sealing ring is designed as a simple, inexpensive component that can be easily manufactured and replaced if necessary. This disposable-like approach to sealing provides reliable sealability at low cost, resolving the contradiction between achieving good sealability and maintaining low manufacturing costs
3Reliability
If the rivet terminal is connected to the current collector plate, then electrical connection is established, but welding strength must be ensured
Solution Approach 1:
The electrical connection between the rivet terminal and current collector plate is achieved through a merged structure where the rivet terminal is directly welded to the current collector plate. This integration ensures both reliable electrical connection and sufficient welding strength by combining the electrical conduction path with the mechanical bonding structure
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 configuration facilitates a more reliable injection process, improves sealability, and allows for effective defect detection, reducing manufacturing costs and ensuring the integrity of the battery.
Implementation Method 1
an upper side of the rivet injection hole of the rivet terminal and an upper side of the current collector plate injection hole may be coupled by laser welding
Data Source
AI summary
The present disclosure relates to a secondary battery that enables injection of an electrolyte by including an injection port in a positive electrode, provides welding strength for welding the positive electrode terminal, and makes detecting defects easier. In an embodiment the secondary battery comprises a cylindrical can having a through-hole formed therein. An electrode assembly is accommodated in the can, with the electrode assembly including a first tab and a second tab. A current collector plate is accommodated in the can, connected to the first tab, and includes a current collector plate injection hole. A rivet terminal is coupled to the through-hole and electrically connected to the first tab. The rivet terminal includes a rivet injection hole through which an electrolyte may be injected.