Multi-Port Electrolyte Filling for Large Electrode Assemblies
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Solution Overview
Problem
In the manufacturing of energy storage devices, such as lithium ion secondary batteries, it is challenging to efficiently impregnate large electrode assemblies with electrolyte solution, leading to air bubbles and incomplete filling, which can affect charge-discharge performance.
Innovation Solution
A method involving degassing of the element case with multiple electrolyte solution filling ports, injecting electrolyte solution from a single filling case through these ports, and using carbon dioxide to reduce bubbles, along with centrifugal force and preliminary charging to ensure complete impregnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If electrolyte solution is injected into a large electrode assembly, then the electrode assembly can be impregnated with electrolyte solution, but air bubbles remain in the central portion and impregnation is insufficient
Solution Approach 1:
The element case is divided into multiple sealing regions (first, second, third sealing regions) with multiple sealing portions, allowing electrolyte solution to be injected through multiple ports simultaneously. This segmentation enables uniform distribution of electrolyte solution throughout the large electrode assembly, preventing air bubble formation in the central portion while ensuring complete impregnation.
2Productivity
If multiple electrolyte solution filling cases are used to inject electrolyte solution through multiple filling ports, then impregnation efficiency improves, but device complexity increases
Solution Approach 1:
Multiple electrolyte solution filling cases are connected through a common pipe system that distributes electrolyte solution to multiple filling ports simultaneously. This merging approach allows a single integrated filling device to service multiple sealing regions, maintaining high productivity while reducing device complexity compared to using separate filling devices for each port.
Solution Approach 2:
A pipe system acts as an intermediary between the electrolyte solution filling cases and the multiple filling ports on the element case. This intermediary structure enables efficient distribution of electrolyte solution to multiple ports simultaneously, achieving high filling efficiency without requiring complex direct connections between each filling case and port.
3Reliability
If the element case is degassed before electrolyte solution injection, then air bubbles are reduced, but the filling process takes more time
Solution Approach 1:
The element case is degassed and sealed in advance before electrolyte solution injection. This preliminary action removes air bubbles from the interior space prior to filling, ensuring that when electrolyte solution is injected through multiple ports, no additional air bubbles are trapped. The multi-port injection method then quickly completes the filling process, minimizing the time penalty of the preliminary degassing step.
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 efficiently fills the electrolyte solution into the element case, reduces air bubbles, and enhances the charge-discharge performance by ensuring thorough impregnation of the electrode assembly.
Implementation Method 1
injecting the electrolyte solution from one electrolyte solution filling case filled with the electrolyte solution into the inside of the degassed element case
Implementation Method 2
using carbon dioxide to reduce bubbles
Implementation Method 3
along with centrifugal force and preliminary charging to ensure complete impregnation
Data Source
AI summary
A method for manufacturing an energy storage device according to one aspect of the present invention includes: degassing an inside of an element case in which an electrode assembly including a positive electrode and a negative electrode is housed and a plurality of electrolyte solution filling ports are provided on one surface; and injecting the electrolyte solution from one electrolyte solution filling case filled with the electrolyte solution into the inside of the degassed element case through the plurality of electrolyte solution filling ports.