Power Storage Device Gas Adsorption Barrier
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Solution Overview
Problem
Lithium-ion secondary batteries face issues with electrolyte solution decomposition, leading to gas generation, which can cause impurities, pressure increase, and potential malfunctions such as expansion or explosion within the hermetically sealed device.
Innovation Solution
Incorporating a gas adsorbing body with an adsorbent separated by a permeable gas barrier within the battery, allowing gases to be adsorbed and preventing them from accumulating and causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hermetically sealed power storage device is used to maintain chemical stability, then reliability is improved, but gas accumulation causes pressure increase leading to expansion or explosion
Solution Approach 1:
An inert gas atmosphere is introduced as an intermediary between the electrolyte solution and the external environment. This inert atmosphere acts as a buffer that absorbs generated gases through the permeable barrier while maintaining the hermetic seal, thus preventing pressure buildup while preserving chemical stability
Solution Approach 2:
The power storage device is filled with an inert gas atmosphere that chemically suppresses decomposition reactions of the electrolyte solution. This inert environment reduces gas generation at the source while the permeable barrier allows any generated gases to pass through, solving both the reliability and pressure control problems
2Power
If high voltage is used to increase power output, then energy density is improved, but electrolyte solution decomposition increases causing gas generation
Solution Approach 1:
The permeable gas barrier, which initially seems to allow harmful gas escape, is actually designed to be selectively permeable. It allows generated gases to pass through to the inert atmosphere while blocking electrolyte solution, thus converting the harmful gas generation side effect into a controlled process that doesn't compromise device integrity or power output
3Object-affected harmful factors
If a permeable gas barrier is added to allow gas escape, then pressure control is improved, but device complexity increases
Solution Approach 1:
A thin-film permeable gas barrier is used instead of complex mechanical pressure relief structures. This thin film provides selective permeability for gases while maintaining structural integrity and chemical stability, achieving pressure control with minimal added complexity
Solution Approach 2:
The permeable gas barrier is constructed as a composite material that combines properties of gas permeability with chemical inertness and mechanical strength. This composite structure achieves multiple functions (pressure control, chemical stability, structural support) in a single component, 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
This design enhances the reliability and stability of the power storage device by reducing gas-related malfunctions, improving security, and maintaining pressure within safe limits.
Implementation Method 1
A separation body which is impermeable to the electrolyte solution and permeable to a gas is provided between the electrolyte solution and the adsorbent
Implementation Method 2
incorporating a gas adsorbing body with an adsorbent separated by a permeable gas barrier within the battery, allowing gases to be adsorbed
Data Source
AI summary
To provide a highly reliable power storage device, to improve the security of a power storage device, and to suppress deterioration of a power storage device, a power storage device includes, inside an exterior material, a positive electrode, a negative electrode facing the positive electrode, an electrolyte solution between the positive electrode and the negative electrode, and an adsorbent. A separation body which is impermeable to the electrolyte solution and permeable to a gas is provided between the electrolyte solution and the adsorbent.