Secondary Battery Electrolyte Filling With Delayed Vacuum Impregnation
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Solution Overview
Problem
The impregnation efficiency of electrolyte into the electrode body of secondary batteries, particularly in larger and wound electrode bodies, is inadequate, leading to longer impregnation times and reduced productivity.
Innovation Solution
A manufacturing method involving a pressure reducing step after electrolyte introduction, followed by a second pressure reducing step, to enhance the pressure differential and improve electrolyte impregnation efficiency, including specific pressure ranges and time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode body is larger in size or has a wider active material layer, then the battery capacity increases, but the electrolyte impregnation time increases
Solution Approach 1:
The patent applies preliminary action by reducing the pressure inside the battery case before introducing the electrolyte. This creates a favorable pressure differential in advance that accelerates the electrolyte impregnation process into the electrode body, thereby reducing the impregnation time even for large-capacity batteries with wide active material layers.
2Quantity of substance
If the electrode body is a wound structure, then the battery capacity increases, but the electrolyte impregnation time increases
Solution Approach 1:
The patent applies preliminary action by reducing the pressure inside the battery case before introducing the electrolyte. This creates a favorable pressure differential in advance that accelerates the electrolyte impregnation process into the wound electrode body, thereby reducing the impregnation time even for large-capacity batteries with wide active material layers.
3Productivity
If adhesion layers are provided on the separator, then the manufacturing productivity improves, but the electrolyte impregnation time increases
Solution Approach 1:
The patent applies preliminary action by reducing the pressure inside the battery case before introducing the electrolyte. This creates a favorable pressure differential in advance that accelerates the electrolyte impregnation process through the adhesion layers and into the electrode body, thereby reducing the impregnation time even when adhesion layers are present.
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 method increases electrolyte impregnation efficiency by exploiting differential pressure and capillary action, reducing impregnation time and enhancing productivity, especially for wound electrode bodies with larger active material layers and adhesion layers.
Implementation Method 1
the difference in pressure between inside and outside the electrode body can be increased
Implementation Method 2
the impregnation rate of the electrolyte in the electrode body can be increased
Data Source
AI summary
Provided is a technology capable of improving the impregnation efficiency of an electrolyte into an electrode body. In accordance with a preferable one embodiment of a method for manufacturing a secondary battery herein disclosed, a method for manufacturing a secondary battery including an electrode body, an electrolyte, and a battery case is provided. The manufacturing method includes a solution introducing step of introducing the electrolyte into the battery case, and a pressure reducing step of reducing the pressure in the battery case after the solution introducing step. After an elapse of 10 hours or more after the solution introducing step, the pressure reducing step is carried out.