Secondary Battery Degassing Vent With Hinged Notch Structure
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Solution Overview
Problem
Secondary batteries face challenges in effectively discharging gases generated during overcharging or abnormal operations without risking explosion, as existing venting mechanisms may fail to manage pressure effectively.
Innovation Solution
A degassing device with a central portion exposed outside, a bonding portion, a peripheral portion with a sloped surface, a notch, and two or more hinges on a straight portion, designed to manage pressure and prevent separation from the battery case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple vent hole is used for gas discharge, then gas discharge function is achieved, but the venting mechanism fails to manage pressure effectively and risks explosion
Solution Approach 1:
The degassing device is segmented into multiple functional portions: a bonding portion for attachment, a peripheral portion with sloped surface for structural strength, a central portion for gas exposure, a notch for controlled rupture, and two or more hinges for maintaining connection. This segmentation allows each portion to perform its specific function effectively, achieving reliable pressure management through the coordinated action of these segments.
Solution Approach 2:
The degassing device incorporates dynamic characteristics through the hinge mechanism that allows the device to rotate or pivot during gas discharge. The sloped surface of the peripheral portion also provides dynamic response to pressure buildup, enabling the device to adapt its configuration based on internal pressure conditions while maintaining effective sealing and discharge functionality.
2Reliability
If a degassing device with notch and hinges is used, then pressure management and prevention of separation are improved, but device complexity increases
Solution Approach 1:
The degassing device is segmented into multiple functional portions: a bonding portion for attachment, a peripheral portion with sloped surface for structural strength, a central portion for gas exposure, a notch for controlled rupture, and two or more hinges for maintaining connection. This segmentation allows each portion to perform its specific function effectively, achieving reliable pressure management through the coordinated action of these segments.
Solution Approach 2:
The hinge structure acts as a cushioning mechanism that anticipates and prepares for the stress of gas discharge. By pre-positioning the hinges in a way that allows controlled rotation, the device cushions the mechanical stress during rupture, preventing sudden separation while maintaining structural integrity throughout the pressure management process.
3Ease of manufacture
If the bonding portion is made small for easy attachment, then ease of manufacture is improved, but the bonding strength is insufficient to prevent separation
Solution Approach 1:
The bonding portion extends in multiple dimensions beyond a simple small attachment point. It has a configured shape that spans across the gas discharge hole opening, providing distribution of bonding forces across a larger area. This dimensional extension maintains ease of attachment while significantly improving bonding strength to prevent separation during gas discharge.
Solution Approach 2:
The bonding portion's geometric parameters are optimized to achieve both ease of manufacture and sufficient strength. The specific shape and size parameters are configured to allow simple attachment processes while providing adequate bonding area and structural configuration to withstand the forces during gas discharge without separation.
Data Source
AI summary
A secondary battery includes a case with an opening, an electrode assembly accommodated in the case, a cap plate bonded to the opening, and a degassing device bonded to a gas discharge hole formed in one of the case and the cap plate to discharge gas inside the case, wherein the degassing device includes a central portion exposed to an outside of the case through an opening of the gas discharge hole, a bonding portion bonded to a circumferential periphery of the gas discharge hole, a peripheral portion that is a surface for connecting the bonding portion and the central portion, a notch formed as a groove in the peripheral portion along an outline formed by the bonding portion, and two or more hinges formed as grooves on a line defined by the notch.