Pouch Battery Venting Valve Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch type lithium secondary batteries face deformation and potential short-circuit issues due to trapped gas, which can lead to smoke or ignition, as existing blocking structures prevent effective gas discharge.
Innovation Solution
A venting system with a wing-shaped body and a gas discharge controlling part that opens and closes a passage based on internal pressure changes, using an elastic member to manage gas release, ensuring safe discharge of gases and maintaining pouch stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking structure is used to prevent water and air introduction, then sealing performance is improved, but gas discharge capability deteriorates
Solution Approach 1:
The patent applies a dynamic venting valve that automatically opens and closes based on internal pressure changes. The valve transitions from a static blocking structure to a dynamic system that responds to pressure conditions, allowing gas discharge when pressure exceeds a threshold while maintaining sealing when pressure is normal.
Solution Approach 2:
The venting valve utilizes pressure parameter changes to control its state. When internal pressure exceeds a predetermined threshold, the valve opens to discharge gas; when pressure returns to normal levels, the valve closes to maintain sealing. This parameter-based control resolves the contradiction between blocking and venting.
2Reliability
If gas is not discharged, then sealing is maintained, but pouch deformation occurs leading to short-circuit risk
Solution Approach 1:
The venting valve system implements a feedback mechanism where internal pressure serves as the feedback signal. The valve continuously monitors pressure conditions and adjusts its state accordingly, opening when pressure builds up to prevent deformation and closing when pressure normalizes to maintain sealing integrity.
Solution Approach 2:
The venting valve operates autonomously based on internal pressure conditions without external control. The system self-regulates by automatically opening to discharge gas when needed and closing to maintain sealing, eliminating the need for external monitoring or intervention.
3Object-generated harmful factors
If a venting passage is provided, then gas discharge is enabled, but sealing performance deteriorates due to potential water and air intrusion
Solution Approach 1:
The venting passage is made dynamic through the automatic venting valve that opens only when needed. This transforms a permanently open passage (which would compromise sealing) into a controlled opening that maintains sealing integrity while enabling gas discharge when internal pressure exceeds the threshold.
Solution Approach 2:
The venting valve acts as an intermediary between the sealed pouch interior and the external environment. It mediates between the need for gas discharge and the requirement for sealing integrity by selectively opening or closing based on pressure conditions, preventing direct communication between the pouch interior and外部环境.
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 system actively discharges gas based on internal pressure changes, preventing pouch deformation and ensuring stability of the lithium secondary battery, with adjustable reference pressure settings for optimal venting operations.
Implementation Method 1
an elastic member to provide a reference pressure for venting operation
Data Source
AI summary
Provided is a venting system of a pouch type lithium secondary battery. According to an exemplary embodiment of the present invention, the venting system of a pouch type lithium secondary battery includes a venting device that controls opening and closing of a passage communicating an internal pressure of a pouch to discharge gas from an inner portion of the pouch.