Electrolyte Injection Nozzle Structure for Low-Impact Cell Filling
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Solution Overview
Problem
Existing liquid injection devices for secondary batteries often cause damage to the electrode assembly due to high injection pressure, resulting in marks, dents, and scratches on the top surface during the electrolyte injection process.
Innovation Solution
A liquid injection device with a modified nozzle design featuring a conical shape and an inner obstacle structure, such as a spiral, vane, or rib, to disperse the injection pressure and reduce the risk of damage by distributing the electrolyte flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure is applied to inject electrolyte, then injection efficiency is improved, but damage to electrode assembly occurs
Solution Approach 1:
The injection nozzle is divided into multiple sections: a conical body portion and an injection part with obstacles. This segmentation allows the flow path to be divided into multiple channels by the obstacles, dispersing the high-pressure electrolyte flow into multiple smaller streams that reduce localized impact pressure on the electrode assembly while maintaining overall injection efficiency
Solution Approach 2:
The obstacles (spiral, vane, or rib structures) act as intermediary elements between the high-pressure electrolyte source and the electrode assembly. These intermediaries modify the flow characteristics by creating turbulence and distributing the flow across multiple paths, thereby reducing the direct impact pressure on the electrode assembly surface
2Device complexity
If conventional nozzle structure is used, then device complexity is reduced, but injection pressure cannot be dispersed
Solution Approach 1:
The nozzle incorporates a conical body portion with a curved surface that gradually transitions from a larger diameter to a smaller diameter. This curved geometry smoothly guides the electrolyte flow and distributes pressure more evenly before the fluid reaches the injection part, reducing sudden pressure spikes that could damage the electrode assembly
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 nozzle design effectively reduces injection pressure, preventing damage to the electrode assembly and ensuring a smooth electrolyte injection process without causing scratches or dents on the top surface.
Implementation Method 1
the injection part includes an obstacle... capable of dispersing an injection pressure as an electrolyte is injected
Data Source
AI summary
A liquid injection device includes a liquid injector including a liquid injection hopper connected to a storage tank configured to store an electrolyte and a valve including an injection nozzle connected to the liquid injector to inject the electrolyte into a cell. The injection nozzle includes a conical body and an injection part protruding from an end of the body, and the injection part includes an obstacle. A shape of the liquid injection nozzle may be changed to disperse an injection pressure of the electrolyte, and damage such as scratches in a top surface of the electrode assembly may be avoided.