Secondary Battery Safety Vent Insulation Layer
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Solution Overview
Problem
Secondary batteries face safety concerns due to increased internal pressure and temperature from abnormal states like over-charging or short-circuiting, leading to potential ignition and performance deterioration.
Innovation Solution
A secondary battery design featuring a safety vent with an insulation layer formed by anodizing treatment on its surface, which insulates the vent from the case and prevents current flow in case of a short circuit by disconnecting the safety vent from the sub-plate when internal pressure exceeds a certain threshold, thereby preventing explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gasket is used to seal between the cap assembly and case, then sealing is achieved, but the gasket may be burnt or melted by heat from internal short circuit causing safety issues
Solution Approach 1:
The patent introduces an insulation layer as an intermediary component between the safety vent and the case. This insulation layer acts as a mediator that prevents direct thermal and electrical contact, protecting the safety vent from heat generated during internal short circuits while maintaining the sealing function through the gasket.
Solution Approach 2:
The patent segments the cap assembly into distinct components: the cap-up, safety vent, cap-down, and insulation layer. This segmentation allows the insulation layer to be positioned specifically between the safety vent and case to provide thermal and electrical isolation, while the gasket continues to provide sealing between the cap assembly and case.
2Reliability
If the safety vent is made of conductive material, then electrical connection is achieved, but current flow during short circuit may cause explosion
Solution Approach 1:
The insulation layer serves as an intermediary that blocks electrical current flow between the safety vent and the case. This allows the safety vent to maintain its structural and safety functions while preventing harmful current flow during short circuit conditions, thereby eliminating the explosion risk.
3Reliability
If the insulation layer is formed on the safety vent, then thermal and electrical isolation is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent applies anodizing treatment to the safety vent, which changes the surface parameters of the metal material to form an insulating oxide layer. This parameter change approach allows the insulation layer to be formed directly on the existing safety vent structure, integrating the insulation function into the manufacturing process rather than adding separate components.
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 insulation layer effectively isolates the safety vent from the case even if the gasket is burnt or melted, ensuring safe disconnection of current flow and preventing battery explosion during abnormal conditions.
Implementation Method 1
an insulation layer is formed on one surface of the safety vent... the insulation layer effectively isolates the safety vent from the case
Implementation Method 2
the insulation layer effectively isolates the safety vent from the case even if the gasket is burnt or melted by heat generated by an internal short circuit
Implementation Method 3
the insulation layer may be formed by performing anodizing treatment on one surface of the safety vent
Implementation Method 4
the insulation layer may be formed by performing anodizing treatment on one surface of the safety vent... the insulation layer may be made of aluminum oxide
Data Source
AI summary
The present invention relates to a secondary battery which is capable of improving safety. As an example, a secondary battery which comprises an electrode assembly; a case which accommodates the electrode assembly; a cap assembly which is coupled to an upper portion of the case, and a gasket which is interposed between the cap assembly and the case, wherein the cap assembly comprises a cap-up, a safety vent which is installed at a lower portion of the cap-up, a cap-down which is installed at a lower portion of the safety vent, an insulator which is interposed between the safety vent and the cap-down, and a sub-plate which is located on a lower surface of the cap-down, and an insulation layer is formed on one surface of the safety vent, is disclosed.