Cylindrical Battery Rupture Disk Venting Without Weld Detachment
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Solution Overview
Problem
Conventional cylindrical batteries face functional loss of the sealing assembly due to detachment of the metal plate from the rupture disk during welding, which inhibits gas venting ability.
Innovation Solution
A cylindrical battery design with a rupture disk fixed by crimping and a separate external terminal that is not crimped, featuring a vent part that ruptures under pressure, ensuring a secure gas venting function without being fixed to the exterior housing can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rupture disk is fixed by crimping to the opening of the exterior housing can, then the sealing assembly is securely attached, but heat or shock during welding may detach the metal plate from the rupture disk, causing functional loss
Solution Approach 1:
The invention divides the sealing assembly into two separate attachment systems: the rupture disk is fixed by crimping to the exterior housing can, while the external terminal is fixed to the rupture disk by a different method (such as welding or bonding) that does not involve crimping. This segmentation allows each component to be attached optimally without interfering with the other, preventing the metal plate detachment issue while maintaining secure attachment.
2Reliability
If a conventional terminal cap is applied to the cylindrical battery, then the external terminal is protected, but the gas venting ability may be inhibited
Solution Approach 1:
The invention extracts the gas venting function from the external terminal structure by providing a separate vent part on the rupture disk. The vent part is specifically designed to rupture and allow gas escape, while the external terminal maintains its protective covering. This separation allows the terminal cap to protect the external terminal without interfering with the gas venting pathway.
3Strength
If the external terminal is fixed to the opening of the exterior housing can, then the terminal is securely attached, but the gas venting function is compromised due to blocking of the vent part
Solution Approach 1:
The invention segments the attachment locations: the external terminal is fixed to the rupture disk (not to the opening of the exterior housing can), and the vent part is formed on the rupture disk in a location that remains accessible for gas venting. This segmentation allows both secure attachment of the terminal and unobstructed gas venting function.
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 prevents functional loss of the sealing assembly during welding and maintains effective gas venting, enhancing safety and reliability.
Implementation Method 1
the rupture disk has a vent part that ruptures when an internal pressure of the battery increases
Implementation Method 2
the rupture disk is fixed by crimping to the opening of the exterior housing can
Data Source
AI summary
The cylindrical battery includes: an electrode body in which a positive electrode plate and a negative electrode plate are wound with a separator therebetween: an electrolyte; a bottomed cylindrical outer can that houses the electrode body and the electrolyte; and a sealing body that closes an opening of the outer can, wherein the sealing body includes a rupture plate that is caulked and fixed to the opening of the outer can with a gasket therebetween, and an external terminal that is not caulked and fixed to the opening of the outer can, the rupture plate has a valve part that is ruptured when an internal battery pressure rises, and the external terminal is fixed to an upper surface portion of a valve part.