Selective Hydrogen Membrane for High Voltage Battery Pressure Control
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries with high positive electrode operating potentials (above 4.3 V vs. metallic lithium) experience gradual gas accumulation, leading to increased internal pressure, particularly in 5 V class batteries, where hydrogen gas generation is prevalent, causing stability issues during long-term use.
Innovation Solution
Incorporating a membrane in the battery case that selectively releases hydrogen gas, while preventing the permeation of other gases like oxygen, nitrogen, and carbon monoxide, to manage internal pressure and maintain battery stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the maximum operating potential of the positive electrode is increased to 4.3 V or higher versus metallic lithium, then the energy density and power output of the battery are improved, but hydrogen gas is generated inside the battery case, causing internal pressure to gradually increase
Solution Approach 1:
The patent extracts only hydrogen gas from the battery interior through a selective permeation membrane that allows hydrogen to pass through while blocking other gases. This removes the harmful hydrogen gas accumulation that causes internal pressure increase, while maintaining the high operating potential benefits.
Solution Approach 2:
A selective permeation membrane acts as an intermediary between the battery interior and exterior. This membrane mediates gas exchange by selectively allowing hydrogen to permeate while preventing other gases from entering or escaping, thus controlling internal pressure without affecting the high-voltage operation.
2Object-generated harmful factors
If a selective permeation membrane is added to the battery case to release hydrogen gas, then internal pressure increase is reduced, but the device complexity increases
Solution Approach 1:
The patent uses a thin selective permeation membrane integrated into the battery case structure. This thin film approach manages hydrogen gas release without requiring complex mechanical components, maintaining relative simplicity while effectively controlling internal pressure.
Solution Approach 2:
The selective permeation membrane utilizes porous material properties to allow hydrogen gas to pass through while blocking other gases. This material-based solution achieves gas separation functionality without complex mechanical structures, reducing overall device 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 membrane effectively reduces internal pressure increases and maintains battery stability by allowing controlled hydrogen gas release, ensuring the battery operates efficiently even with high positive electrode potentials.
Implementation Method 1
a membrane that allows carbon dioxide to permeate while restricting permeation of water vapor
Implementation Method 2
The membrane is capable of selectively releasing hydrogen gas
Data Source
AI summary
A non-aqueous electrolyte secondary battery (10) proposed herein includes an electrode assembly (40), an electrolyte solution (80), and a battery case (20). The battery case (20) accommodates the electrode assembly (40) and the electrolyte solution (80). A membrane (201) capable of selectively releasing a hydrogen gas is provided on a portion of the battery case (20) so as to separate the interior and the exterior of the battery case (20).