Secondary Battery Venting Structure for Gas Release and Moisture Blocking
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Solution Overview
Problem
As energy density in secondary batteries increases, so does gas generation, leading to defects and performance deterioration due to moisture permeation, which must be minimized to prevent side reactions and gas-related issues.
Innovation Solution
A secondary battery design featuring an electrode assembly with alternately stacked electrodes and separators, a battery case with a sealing part and connection pipe, and an aroma valve that discharges internal gas when pressure exceeds a predetermined level, while minimizing external moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If energy density of the secondary battery is increased, then battery capacity is improved, but gas generation increases causing defects and performance deterioration
Solution Approach 1:
The patent extracts the harmful gas from the battery system by providing a dedicated gas discharge path through the connection pipe and aroma valve. The connection pipe extends from the accommodation part through the sealing part to the external environment, allowing gas to be removed from the closed battery system while maintaining the high energy density configuration that generates the gas.
Solution Approach 2:
The aroma valve acts as an intermediary component between the battery interior and external environment. It selectively controls gas discharge while preventing moisture ingress, serving as a mediator that resolves the contradiction between needing to vent gas and maintaining a sealed, moisture-free environment for high capacity operation.
2Stress or pressure
If gas is discharged to the outside, then internal pressure is reduced, but moisture may permeate from the outside causing side reactions
Solution Approach 1:
The aroma valve serves as a selective intermediary that allows gas molecules to pass through while blocking moisture molecules. This mediator enables pressure relief without compromising the moisture barrier, resolving the contradiction between gas discharge and moisture prevention.
Solution Approach 2:
The connection pipe and aroma valve create a localized controlled interface between the sealed battery interior and the external environment. This localized opening provides selective permeability properties that differ from the rest of the sealed battery case, allowing gas escape while maintaining overall moisture exclusion.
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
Effectively discharges internal gas while reducing moisture permeation, thereby enhancing battery performance and preventing defects caused by gas generation and moisture-related side reactions.
Implementation Method 1
an aroma valve connected to the other side of the connection pipe and disposed outside the battery case so as to be opened to discharge an internal gas when an internal pressure of the battery case is greater than or equal to a predetermined pressure
Implementation Method 2
the connection pipe having one side connected to the accommodation part of the battery case and the other side connected to the outside of the battery case and passing through the battery case
Data Source
AI summary
A secondary battery includes an electrode assembly, in which electrodes and separators are alternately stacked, and a battery case, in which an accommodation part accommodating the electrode assembly is formed. A sealing part is formed along an outer circumferential surface of the battery case. The secondary battery also includes a connection pipe having one side connected to the accommodation part of the battery case and the other side connected to the outside of the battery case and passing through the battery case, and an aroma valve connected to the other side of the connection pipe 140. The aroma valve is disposed outside the battery case so as to be opened to discharge an internal gas when an internal pressure of the battery case is greater than or equal to a predetermined pressure.