Battery Degassing Vent With Hinges to Prevent Separation
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Solution Overview
Problem
Existing degassing devices in secondary batteries can completely separate from the battery case when the notch is ruptured by internal pressure, posing safety risks.
Innovation Solution
A degassing device with a central portion exposed to the outside, a bonding portion, a peripheral portion with a sloped surface, a notch with a groove shape, and two or more hinges on the notch, designed to prevent complete separation by allowing the hinges to bend instead of breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the notch is made to rupture easily for gas discharge, then gas discharge efficiency is improved, but the degassing device may completely separate from the battery case
Solution Approach 1:
The peripheral portion is divided into multiple segments by forming two or more hinges, creating independent bending zones. When gas pressure ruptures the notch, each hinge segment can bend independently to absorb energy and prevent complete separation of the degassing device from the battery case.
Solution Approach 2:
The hinges are designed to transition from a rigid state during normal operation to a flexible bending state during gas discharge. This dynamic behavior allows the structure to maintain attachment reliability while enabling effective gas discharge through controlled deformation.
2Reliability
If the bonding portion is made strong to prevent separation, then attachment reliability is improved, but gas discharge may be hindered
Solution Approach 1:
Different regions of the degassing device are assigned different mechanical properties: the bonding portion maintains strong attachment properties, while the peripheral portion with hinges is designed to be more flexible. This local differentiation allows strong bonding without hindering gas discharge capability.
Solution Approach 2:
The structure is segmented into a bonding portion for strong attachment and a peripheral portion with hinges for flexible gas discharge. This segmentation allows each region to optimize its function independently, preventing the trade-off between bond strength and discharge efficiency.
3Productivity
If the notch is made deep to facilitate rupture, then gas discharge is improved, but structural strength is reduced
Solution Approach 1:
The hinge structure transforms the static deep notch into a dynamic bending element. The notch can be made sufficiently deep to facilitate rupture, while the hinge provides dynamic structural support that prevents complete structural failure during gas discharge.
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 ensures the degassing device remains securely attached to the battery case, maintaining safety by preventing complete separation and ensuring effective gas discharge.
Implementation Method 1
two or more hinges on a line defined by the notch... allowing the hinges to bend instead of breaking
Data Source
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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.