Secondary Battery Vent Valve Assembly for Gas Release Under Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current secondary batteries face challenges in improving performance while maintaining safety and vibration resistance, particularly in managing internally generated gases effectively.
Innovation Solution
A secondary battery design incorporating a safety valve mechanism with a cleavable valve part, an annular protruding part, and an insulating holder member, which allows for the firm holding of an electrically conductive member, enhancing vibration resistance and safety by facilitating the discharge of internal gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety valve mechanism is added to release internal gases, then safety performance is improved, but device complexity increases
Solution Approach 1:
The insulating holder member is divided into multiple insulating pieces arranged in the circumferential direction, with each piece independently holding the electrically conductive member. This segmentation allows the safety valve mechanism to be constructed from modular components that are easier to manufacture and assemble, thereby improving safety performance without excessively increasing overall device complexity
Solution Approach 2:
The insulating holder member serves multiple functions: it provides electrical insulation between the electrically conductive member and other components, mechanically holds the electrically conductive member in position, and maintains the structural integrity of the safety valve mechanism. By combining multiple functions into a single component, the design improves safety performance while minimizing the increase in device complexity
2Reliability
If the insulating holder member is divided into multiple insulating pieces, then vibration resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating holder member is segmented into multiple identical or similar insulating pieces arranged circumferentially. Each piece has the same structure and function, allowing for standardized mass production through injection molding or other manufacturing processes. This segmentation improves vibration resistance by distributing mechanical stresses across multiple components while maintaining ease of manufacture through modular production
Solution Approach 2:
The number of insulating pieces can be adjusted as a design parameter to optimize the balance between vibration resistance and manufacturing complexity. By selecting an appropriate number of pieces (e.g., 2, 3, or 4), the design allows manufacturers to tailor the complexity level to production capabilities while achieving sufficient vibration resistance for the application
3Productivity
If the valve part is made cleavable, then gas discharge speed is improved, but structural strength is reduced
Solution Approach 1:
The valve part is pre-designed with a cleavable structure that remains intact during normal operation but automatically breaks apart when gas pressure reaches a critical level. This preliminary design allows the valve to maintain structural strength under normal conditions while being prepared in advance to rapidly discharge gas when needed, resolving the contradiction between strength and gas discharge speed
Solution Approach 2:
The mechanical properties of the valve part are engineered to exhibit non-linear behavior: high strength and rigidity under normal operating pressures, but designed to fail at a specific stress threshold. This parameter optimization allows the valve to provide both structural integrity during normal use and rapid gas discharge capability when pressure exceeds safety limits
Data Source
AI summary
The secondary battery includes a battery device, a container member, and a safety valve mechanism. The safety valve mechanism is attached to an end part, of the container member, in a height direction. The safety valve mechanism includes a valve member having an electrically conductive property, an insulating holder member, and an electrically conductive member. The valve member includes a valve part and an annular protruding part. The valve part is cleavable. The annular protruding part extends along a horizontal plane and surrounds the valve part. The horizontal plane is orthogonal to the height direction. The insulating holder member includes insulating pieces into which the insulating holder member is divided in a circling direction in which the annular protruding part extends. The insulating pieces each include an abutting part positioned on an inner side of the annular protruding part in a radial direction of the container member and abutting against the annular protruding part. The electrically conductive member includes a projecting part electrically coupled to the valve part. The electrically conductive member overlaps with the valve member in the height direction and is held by the insulating holder member.