Secondary Battery Cap Assembly for External Short-Circuit Interruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries face safety issues due to slow operation of current interrupt devices during external short circuits, leading to potential overheating and explosion, as internal pressure increases without proper disconnection.
Innovation Solution
A secondary battery design featuring a cap assembly with a safety vent and sub-plate connected by a solder member with a melting point of 200° C to 300° C, which disconnects upon external short circuits or increased pressure, interrupting current flow and preventing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cap assembly is sealed to prevent electrolyte leakage, then containment is improved, but sealing may be cancelled due to component damage, obstructing proper CID operation
Solution Approach 1:
The solder member is pre-positioned and pre-soldered to the cap-down and sub-plate before battery assembly. This preliminary action ensures that the safety vent pathway is established and the CID is properly positioned within the sealed structure from the beginning, preventing sealing cancellation issues that could obstruct CID operation during abnormality events.
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 design enhances safety by ensuring immediate disconnection of current flow during external short circuits or overcharging, preventing overheating and potential explosions.
Implementation Method 1
the solder member is melted due to an external short circuit, so that the safety vent is disconnected from the sub-plate
Data Source
AI summary
The present invention relates to a secondary battery enabling enhanced safety in case of an external short circuit. According to one example, the secondary battery comprises: an electrode assembly; a case for accommodating the electrode assembly; and a cap assembly coupled to the top of the case. The cap assembly comprises: a cap-up; a safety vent provided below the cap-up; a cap-down provided below the safety vent and having a through hole and a gas discharge hole; an insulator provided between the safety vent and the cap-down; a sub-plate provided below the cap-down; and a solder member for electrically connecting the safety vent and the sub-plate. The safety vent and the sub-plate are electrically connected by means of soldering.