Flat Battery Electrolyte Absorber Structure to Prevent Leakage
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Solution Overview
Problem
Existing methods for manufacturing flat-shaped batteries face issues with electrolyte solution leakage and reduced productivity due to slow absorption of electrolyte by the separator and positive electrode, and complications in electrical connections.
Innovation Solution
A flat-shaped battery design that includes a porous electrolyte solution absorber between the positive electrode and the outer can inner bottom surface, allowing for efficient absorption and retention of electrolyte solution, and electrical connection through the absorber or direct contact with the outer can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the separator and positive electrode are used to absorb the electrolyte solution, then the battery structure is simple, but the electrolyte solution leaks due to slow absorption speed
Solution Approach 1:
The patent introduces a porous electrolyte solution absorber as an intermediary component between the positive electrode and the outer can. This absorber rapidly absorbs the electrolyte solution and prevents it from leaking, while the separator and positive electrode continue to serve their original functions. The absorber acts as a mediator that solves the leakage problem without complicating the overall battery structure.
Solution Approach 2:
The patent employs a porous electrolyte solution absorber with specific porosity characteristics to rapidly absorb the electrolyte solution. The porous structure enables fast absorption kinetics, preventing the electrolyte from leaking while maintaining the simplicity of the battery design. The porous material properties are optimized to balance absorption speed and electrolyte retention.
2Reliability
If a recess is provided on the bottom side of the positive electrode can to accumulate electrolyte solution, then electrolyte leakage is prevented, but air bubbles remain and capacity decreases
Solution Approach 1:
The patent extracts the electrolyte accumulation function from the battery's main structural components (positive electrode can and separator) and assigns it to a dedicated porous absorber component. This separation allows the absorber to handle electrolyte accumulation without creating air bubbles that would reduce battery capacity, while the other components focus on their primary electrochemical functions.
Solution Approach 2:
The porous absorber serves as an intermediary that accumulates excess electrolyte solution without preventing proper electrolyte distribution to the electrodes. It absorbs and holds the electrolyte in a controlled manner, preventing leakage while avoiding the formation of air bubbles that would occur in a recess structure, thereby maintaining battery capacity.
3Reliability
If a pouch-like body with liquid-tight film is used to enclose the positive electrode, then electrolyte leakage is prevented, but electrical connection becomes difficult and process complexity increases
Solution Approach 1:
Instead of using a pouch-like body with liquid-tight film, the patent introduces a porous electrolyte absorber as an intermediary component that prevents electrolyte leakage without interfering with electrical connections. The absorber is permeable to ions and does not create barriers to electron flow, maintaining electrical connectivity while preventing leakage.
Solution Approach 2:
The patent uses a porous electrolyte solution absorber instead of a liquid-tight film enclosure. The porous structure allows ion transport and maintains electrical connectivity while providing leakage prevention. This approach simplifies the manufacturing process by eliminating the need for pouch-like bodies and liquid-tight films, reducing process complexity while maintaining reliability.
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 productivity by preventing electrolyte leakage and maintaining electrical connectivity, ensuring effective manufacturing and performance of the battery.
Implementation Method 1
a porous electrolyte solution absorber is inserted between the positive electrode and an inner bottom surface of the outer can
Data Source
AI summary
The flat-shaped battery of the present invention comprises a battery container provided with an outer can and a sealing plate, and a positive electrode, a negative electrode, a separator, and an electrolyte solution are enclosed in the battery container. The positive electrode is housed in the outer can, and a porous electrolyte solution absorber is inserted between the positive electrode and an inner bottom surface of the outer can. Also, the method for manufacturing a flat-shaped battery, including: disposing an electrolyte solution absorber on an inner bottom surface of the outer can; disposing the positive electrode on the electrolyte solution absorber; and injecting the electrolyte solution into the outer can after disposing the electrolyte solution absorber, before or after disposing the positive electrode. A porous body having a porosity of 40 to 90% is used as the electrolyte solution absorber.