Battery Case Expansion for Single-Step Electrolyte Filling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing manufacturing methods for secondary batteries face challenges in efficiently supplying a sufficient amount of electrolytic solution to the electrode body, particularly as the excess space between the battery case and the electrode body narrows, leading to reduced manufacture efficiency due to the need for multiple injections.
Innovation Solution
A manufacturing method that involves assembling the battery case, increasing its capacity by injecting gas through a regulated deformation of the side walls using a regulation jig, and then injecting the electrolytic solution into the expanded case, which allows for a single, efficient filling of the solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode body is made larger, then the battery capacity is improved, but the excess space for holding electrolytic solution is reduced
Solution Approach 1:
The battery case is pre-expanded by injecting gas before the electrolytic solution is injected. This preliminary expansion creates sufficient excess space in advance, allowing the entire electrode body to be adequately supplied with electrolytic solution in a single injection operation, thereby resolving the contradiction between large electrode size and sufficient electrolytic solution space
2Quantity of substance
If the excess space is filled with electrolytic solution, then the electrolytic solution supply is improved, but the number of injection operations increases
Solution Approach 1:
The battery case is pre-expanded by injecting gas before the electrolytic solution is injected. This preliminary expansion creates sufficient excess space in advance, allowing the entire electrode body to be adequately supplied with electrolytic solution in a single injection operation, thereby resolving the contradiction between adequate electrolytic solution supply and manufacturing efficiency
3Volume of stationary object
If gas is injected to expand the battery case, then the inside capacity is improved, but the side wall deformation becomes uncontrolled
Solution Approach 1:
A regulation jig is introduced as an intermediary tool during the gas injection process. The regulation jig contacts the side wall of the battery case to control and regulate the deformation, ensuring that the inside capacity is increased while the side wall deformation remains within acceptable manufacturing precision limits
Solution Approach 2:
The regulation jig provides real-time feedback control during the gas injection process by mechanically constraining the side wall deformation. This feedback mechanism allows the system to maintain control over the expansion process, ensuring that the inside capacity increases while preventing excessive or uncontrolled side wall deformation
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 method significantly increases the internal capacity of the battery case, reducing the number of electrolytic solution injections and enhancing manufacturing efficiency by ensuring a sufficient supply in a single step.
Implementation Method 1
a capacity increasing step for increasing an inside capacity of a battery case by injecting a gas via an electrolytic solution liquid injection hole to an inside of a battery case having been assembled so as to deform a battery case
Data Source
AI summary
A herein disclosed manufacturing method includes a battery case assembling step to assemble a battery case, a capacity increasing step at which an inside capacity of the battery case is increased by injecting a gas via an electrolytic solution liquid injection hole to an inside of a battery case having been assembled so as to deform a battery case, a liquid injecting step at which an electrolytic solution is injected via an electrolytic solution liquid injection hole to an inside of a battery case having been deformed, and a sealing step to seal a battery case on which a liquid injection has been performed. Furthermore, regarding the herein disclosed manufacturing method, at the capacity increasing step, a regulation jig is used to regulate a deformation of a part of a side wall. By doing this, it becomes easier to control a deformed position or a deformed amount.