Pouch Cell Electrode Lead Venting for Uniform Internal Pressure
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Solution Overview
Problem
Pouch-shaped lithium secondary batteries face swelling and potential explosion due to gas generation during charging and discharging, which existing technologies fail to adequately address while maintaining energy density and user safety.
Innovation Solution
A pouch-shaped battery cell with a gas discharge portion in the electrode lead that allows gas to escape when internal pressure exceeds external pressure, integrated with a sensor and alarm system to detect harmful gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate space is provided to receive gas generated in the battery cell, then safety is improved, but energy density is reduced
Solution Approach 1:
The gas discharge portion is merged with the electrode lead structure, combining the electrical connection function and gas discharge function into a single integrated component. This eliminates the need for separate gas management space while maintaining safety functionality.
Solution Approach 2:
The electrode lead is given multiple functions: it serves both as an electrical connection member and as a gas discharge pathway. The gas discharge portion integrated into the lead structure allows the same component to handle both electrical current and gas venting operations.
2Reliability
If a valve structure is added to discharge gas, then safety is improved, but device complexity is increased
Solution Approach 1:
The valve function is merged into the electrode lead assembly. The gas discharge portion is formed as an integral part of the lead structure rather than as a separate valve component, simplifying the overall device architecture while maintaining gas discharge capability.
Solution Approach 2:
The electrode lead structure itself provides the gas discharge function without requiring external valve mechanisms. The lead's own structure is designed to allow gas passage when needed, making the system self-sufficient for gas management.
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
Prevents deformation and explosion by maintaining internal pressure, ensures safe gas discharge without additional space, and alerts users to harmful gases, enhancing safety and energy density.
Implementation Method 1
a gas discharge portion (130) located in the electrode lead (122)... when the internal pressure of the pouch-shaped battery cell is greater than the external pressure, gas in the pouch-shaped battery cell may be discharged
Data Source
AI summary
The present invention relates to a pouch-shaped battery cell including a battery case made of a laminate sheet, an electrode assembly received in the battery case, the electrode assembly having an electrode tab protruding therefrom, an electrode lead electrically connected to the electrode tab, the electrode lead extending outwards from the battery case, and a gas discharge portion located in the electrode lead, wherein it is possible to prevent the internal pressure of the pouch-shaped battery cell from being increased to a predetermined level or more.