Electrode Lead Gas Release Structure for Safer Secondary Batteries
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Solution Overview
Problem
Lithium secondary batteries face safety issues due to increased gas generation and degradation caused by water infiltration, leading to reduced battery life when vented, as existing gas release methods are inefficient and costly, and result in significant battery degradation.
Innovation Solution
An electrode lead with a gas release portion formed by surface-treatment or removal of a coating layer on the metal substrate, using non-adhesive materials like polyimide-based or fluorine-based coatings, which allows for efficient gas release without damaging the electrode lead and simplifies the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas release portion is formed in a secondary battery to release generated gases, then battery safety is improved, but battery life is significantly reduced
Solution Approach 1:
The electrode lead is designed with a localized gas release portion that has different properties from the rest of the lead. Specifically, the coating layer is removed or a non-adhesive material is applied only at the gas release portion, creating a local non-stick surface that prevents sealant adhesion. This localized modification allows gas to escape through the lead without compromising the overall battery life, as the gas release function is confined to a specific area rather than requiring complete battery venting
Solution Approach 2:
The electrode lead is segmented into different functional zones: a sealed portion with coating layer for maintaining sealant adhesion and battery integrity, and a gas release portion without coating layer or with non-adhesive material for gas escape. This segmentation allows the battery to maintain its structural integrity while providing a dedicated pathway for gas release, thus improving safety without significantly reducing battery life
2Reliability
If existing gas release methods are used, then gas can be released from the battery, but manufacturing cost increases and processing efficiency decreases
Solution Approach 1:
The gas release function is merged with the existing electrode lead structure rather than being implemented as a separate component. By utilizing the electrode lead itself as the gas release pathway through localized coating removal or non-adhesive material application, the invention eliminates the need for additional gas release components, thereby reducing manufacturing cost and simplifying the production process while maintaining effective gas release capability
Solution Approach 2:
The electrode lead serves multiple functions: electrical connection, mechanical support, and gas release. By designing the lead with a gas release portion that prevents sealant adhesion through coating removal or non-adhesive material application, the lead becomes a multi-functional component that performs both its traditional electrical role and an additional safety function, eliminating the need for separate gas release mechanisms and reducing overall manufacturing complexity
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 solution enhances battery safety by allowing controlled gas release, extending battery life while maintaining cost competitiveness and processing efficiency, and preventing corrosion and electrolyte leakage.
Implementation Method 1
a coating layer which is coated on the metal substrate
Implementation Method 2
at least one surface of a top surface and a bottom surface of the electrode lead may have a gas release portion having a structure which is formed by surface-treatment with a non-adhesive material, or by removing the coating layer
Data Source
AI summary
An electrode lead for a secondary battery includes a metal substrate, and a coating layer formed on the surface of the metal substrate, wherein at least one surface of the top surface and the bottom surface of the electrode lead has a gas release portion having a structure formed by surface-treatment with a non-adhesive material, or by removing the coating layer. A secondary battery including the electrode lead is also disclosed.