Pouch Cell Lead Film Venting With Moisture-Blocking Pressing Member
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Solution Overview
Problem
Pouch cells face degradation due to moisture penetration through gas discharge passages, leading to venting and potential explosion, which existing configurations fail to adequately prevent.
Innovation Solution
A pouch cell design featuring a lead film with a gas flow path that closes when internal pressure exceeds a set point, and a pressing member outside the pouch that seals the passage after gas discharge, preventing moisture ingress and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a gas discharge passage is provided in the pouch cell, then gas can be discharged from the pouch to the outside, but moisture can penetrate from the outside into the pouch through the passage causing degradation
Solution Approach 1:
The passage is designed to dynamically change its state between open and closed based on internal pouch pressure. When pressure exceeds a set point, the passage opens to discharge gas; when pressure decreases, the passage automatically closes to prevent moisture penetration, creating a dynamic response system that adapts to pressure conditions
Solution Approach 2:
The passage structure enables self-regulation without external control mechanisms. The passage automatically opens when internal pressure pushes against it and automatically closes when pressure decreases, using the pressure differential itself to control the sealing action, eliminating the need for external actuators or control systems
2Reliability
If a pressing member is added to seal the passage, then moisture penetration is prevented, but device complexity increases
Solution Approach 1:
A pressing member is introduced as an intermediary element between the pouch and the passage. This pressing member applies force to keep the passage closed and works in conjunction with the pressure differential to ensure reliable sealing, serving as a mediator that enhances sealing without requiring complete structural redesign
Solution Approach 2:
The pressing member is positioned specifically at the passage location rather than uniformly across the entire pouch. This localized approach concentrates sealing force only where needed at the passage, avoiding unnecessary complexity in other areas and maintaining overall structural simplicity while achieving reliable sealing
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 prevents moisture penetration and maintains pouch cell stability by sealing the gas flow path after discharge, enhancing the utilization of the pressing member across various pouch cell types.
Implementation Method 1
The connector may include an elastic portion that provides an elastic resilience enabling the first presser and the second presser to press the passage
Implementation Method 2
Each of the first presser and the second presser may include a protector that is deformable to absorb impacts and disposed in contact with the pouch
Data Source
AI summary
A pouch cell includes: an electrode lead electrically connected to an electrode assembly accommodated in a pouch to protrude outwardly from the pouch; a lead film that covers a portion of the electrode lead to insulate the electrode lead from the pouch, and includes a passage that forms a gas flow path when a pressure inside the pouch increases to a set pressure or higher; and a pressing member that is disposed outside the pouch, and presses the passage to close the gas flow path of the passage.