Secondary Battery Venting Layer to Block Electrolyte Leakage
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Solution Overview
Problem
Secondary batteries face issues with electrolyte leakage when gas is discharged through the vent portion, which can affect surrounding devices and compromise safety and stability.
Innovation Solution
A secondary battery design incorporating a leakage prevention portion with a leakage prevention layer and body portion that allows gas to pass while preventing liquid discharge, featuring a porous structure and strategic positioning to contain electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent portion is formed in the case to discharge gas when internal pressure increases, then gas discharge function is improved, but electrolyte may be discharged together with gas causing leakage
Solution Approach 1:
A leakage prevention portion is introduced as an intermediary component between the vent portion and the external environment. This portion includes a leakage prevention layer with porous structure that mediates the discharge process, allowing gas to pass through while blocking electrolyte liquid, thus preventing harmful electrolyte leakage while maintaining the venting function
Solution Approach 2:
The leakage prevention layer is designed with a porous structure having specific pore size and distribution. These porous materials allow gas molecules to pass through the pores while the surface tension and viscosity of the electrolyte liquid prevent it from penetrating through the porous structure, achieving selective permeability
2Stress or pressure
If the vent portion is made breakable to release pressure, then pressure relief is improved, but control over discharge timing and composition is reduced
Solution Approach 1:
The vent portion is designed as a breakable structure that transitions from a sealed state to an open state when internal pressure exceeds a predetermined threshold. This dynamic design allows automatic pressure relief without complex control mechanisms, while the leakage prevention portion remains in place to maintain control over discharge composition
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
Enhances safety and stability by preventing electrolyte leakage, ensuring the battery's integrity and reducing potential chemical reactions with surrounding devices.
Implementation Method 1
the leakage prevention layer may have a porous structure
Implementation Method 2
the leakage prevention layer may be configured to allow gas, discharged from the vent portion, to pass therethrough, and to not allow liquid, discharged from the vent portion, to pass therethrough
Data Source
AI summary
A secondary battery and a battery module including the same are disclosed. In some implementations, the secondary battery may include an electrode assembly including a negative electrode plate, a positive electrode plate, and a separator interposed between the negative electrode plate and the positive electrode plate, a case accommodating the electrode assembly, a vent portion positioned on a plate disposed on one side of the case, the vent portion including a notch portion configured to be breakable; and a leakage prevention portion disposed further outwardly than the vent portion, the leakage prevention portion coupled to the plate on which the vent portion is positioned. The leakage prevention portion may include a leakage prevention layer disposed to oppose the vent portion, a body portion disposed between the leakage prevention layer and the vent portion, the body portion having an opening.