Battery Case Segmentation for Electrolyte Management
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Solution Overview
Problem
Lithium secondary batteries face issues with electrolyte depletion and battery lifespan due to anode expansion and gas generation, leading to decreased performance over time.
Innovation Solution
A battery case design featuring a first accommodation part with an irreversible opening for gas release and a second part with a porous film to maintain electrolyte levels, ensuring the battery's lifespan by controlling gas discharge through strategically positioned openings with specific rupture pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the battery uses a conventional single-chamber structure, then the device is simple in structure, but the electrolyte is depleted due to anode expansion and gas generation, reducing battery lifespan
Solution Approach 1:
The battery case is divided into two separate accommodation parts: a first accommodation part for the electrode assembly and a second accommodation part for additional electrolyte. This segmentation allows the electrolyte to be replenished from the second chamber to the first chamber, maintaining adequate electrolyte levels and extending battery lifespan without compromising structural simplicity.
2Reliability
If gas is generated during battery operation, then the battery operates normally, but the gas accumulates and prevents further electrolyte movement, reducing battery performance
Solution Approach 1:
An irreversible opening communication hole is provided between the first and second accommodation parts, serving as an intermediary pathway. This hole allows gas to pass from the first accommodation part to the second accommodation part, preventing gas accumulation in the electrode assembly chamber and maintaining reliable battery operation.
3Duration of action of stationary object
If the battery case is designed with separate accommodation parts, then electrolyte level is maintained and battery lifespan is extended, but the device complexity increases
Solution Approach 1:
The first and second accommodation parts are merged into a single integrated battery case structure, sharing common walls and the irreversible opening communication hole. This merging approach maintains the functional benefits of separate chambers for electrolyte management while avoiding the complexity of completely separate battery units.
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 effectively maintains the electrolyte level in the electrode stack, enhancing battery lifespan by managing gas release and preventing electrolyte depletion.
Implementation Method 1
a first irreversible opening communication hole between the first accommodation part and the second accommodation part
Implementation Method 2
the inner wall of the case part including the second irreversible opening is provided with a porous film
Data Source
AI summary
Disclosed is a battery case including a case part including a first accommodation part having an irreversible opening to irreversibly release a closed state and a second accommodation part separated from the first accommodation part, and a cover part installed at the case part.