Battery Liquid Housing Portion Segmentation for Electrolyte Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method for producing battery packs results in a significant decrease in the amount of electrolytic solution due to scattering during the vacuuming process, leading to reduced degassing efficiency and increased battery thickness, especially during high-temperature storage.
Innovation Solution
A method involving the formation of a liquid housing portion at one end of the outer package, where an electrolytic solution is injected and stored, followed by degassing through an opening at the other end in a vacuum state, and then sealing to prevent scattering and enhance degassing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vacuuming is performed while electrolytic solution is stored in the opening portion above the battery element, then the electrolytic solution can be injected and impregnated into the battery element, but the electrolytic solution is forced up by air and scattered, significantly decreasing the amount of electrolytic solution
Solution Approach 1:
The outer package is divided into two functional regions: a first region (liquid housing portion) for storing the electrolytic solution and a second region for housing the battery element. This segmentation prevents the electrolytic solution from being scattered during vacuuming by confining it to a dedicated storage area where it is held by surface tension and capillary forces.
Solution Approach 2:
A liquid-tight partition wall is introduced as an intermediary structure between the liquid housing portion and the battery element housing space. This partition allows the electrolytic solution to be impregnated into the battery element through capillary action while preventing direct contact and scattering during the vacuuming process.
2Reliability
If electrolytic solution is stored in the opening portion above the battery element, then impregnation can occur, but the presence of electrolytic solution above the battery element decreases the degassing efficiency of the battery element and its housing space
Solution Approach 1:
By segmenting the outer package into a liquid housing portion and a battery element housing space, the electrolytic solution is confined to the first region during vacuuming. This allows air to be efficiently evacuated from the battery element and its housing space without the electrolytic solution interfering with the degassing process.
Solution Approach 2:
The electrolytic solution is pre-positioned in the liquid housing portion before vacuuming begins. This preliminary positioning ensures that during the vacuuming process, the battery element and its housing space can be fully degassed without the electrolytic solution occupying the space above the battery element.
3Weight of moving object
If the outer package uses a laminate film structure, then the battery pack achieves lightweight properties and high energy density, but the opening portion must be heat-sealed and cut, increasing manufacturing complexity
Solution Approach 1:
The liquid housing portion is formed by preliminary folding and heat-sealing of the laminate film to create a confined space for the electrolytic solution. This preliminary structuring allows the opening portion to be sealed in advance, eliminating the need for post-assembly sealing operations and reducing manufacturing 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 approach effectively suppresses the scattering of the electrolytic solution, maintains its amount, improves degassing efficiency, and reduces battery thickness, while also shortening impregnation time and reducing equipment costs.
Implementation Method 1
forming a space by expanding a liquid housing portion, the liquid housing portion being present at one end of an outer package that houses a battery element, through supply of gas from an opening portion formed at the other end of the outer package
Implementation Method 2
degassing the outer package through the opening portion in a vacuum state
Implementation Method 3
impregnating the electrolytic solution into the battery element
Data Source
AI summary
A method for producing a battery includes forming a space by expanding a liquid housing portion, the liquid housing portion being present at one end of an outer package that houses a battery element, through supply of gas from an opening portion formed at the other end of the outer package; injecting an electrolytic solution from the opening portion to store the electrolytic solution in the space of the liquid housing portion; degassing the outer package through the opening portion in a vacuum state; sealing the opening portion; and impregnating the electrolytic solution into the battery element.