Y-Type Zeolite Adsorbent in Secondary Cells for Gas Pressure Control
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Solution Overview
Problem
Lithium secondary cells are prone to ignition and explosion due to thermal runaway and gas production, which compromises safety without deteriorating cell performance.
Innovation Solution
Incorporating a Y-type zeolite adsorbent between the cell case and electrode assembly to adsorb gases like carbon dioxide and hydrogen fluoride, enhancing thermal stability and preventing pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chemical safety device (additive) is added to the electrolyte solution or electrode, then safety is improved, but cell performance is deteriorated
Solution Approach 1:
The patent introduces a physical safety device (seal structure with pressure-responsive opening) as an intermediary component between the cell components. This mediator provides safety functionality without requiring chemical additives that would deteriorate cell performance, thus resolving the contradiction between safety improvement and performance maintenance.
2Object-generated harmful factors
If gas is produced by electrolyte solution decomposition or electrode reaction, then cell internal pressure increases causing swelling, but no effective gas management mechanism is provided
Solution Approach 1:
The patent implements a seal structure with a pre-designed pressure-responsive opening that activates when gas production causes pressure buildup. This preliminary structural design enables automatic gas venting before critical failure occurs, addressing the harmful gas production effect and maintaining cell stability.
Solution Approach 2:
The seal structure utilizes phase transition (opening/closing) based on pressure differential to manage gas production. When internal pressure exceeds external pressure by a threshold, the opening transitions from closed to open state, allowing gas escape and preventing dangerous pressure buildup.
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 Y-type zeolite adsorbent effectively reduces gas production, preventing thermal runaway and maintaining cell performance, thereby enhancing safety and extending cell life.
Implementation Method 1
a Y-type zeolite adsorbent is disposed between the cell case and the electrode assembly
Data Source
AI summary
Provided is a secondary cell including a Y-type zeolite adsorbent. The secondary cell including a Y-type zeolite adsorbent of the present invention may remove gas such as carbon dioxide and hydrogen fluoride produced inside by adsorption to prevent a sealing part from being pushed, and improve stability such as maintaining secondary cell performance, increasing a cell life, and preventing ignition.