Compact Vacuum Electrolyte Injection System for Battery R&D

AOT-MSK-113-CP is a semi-automatic electrolyte injection device used for operating inside glove boxes. It is specifically designed for precise, efficient, and safe electrolyte filling and vacuum soaking of laboratory grade batteries of various shapes and sizes, such as button batteries, pouch batteries, cylindrical batteries, etc.

1. Design concept and positioning

The core design concept of AOT-MSK-113-CP is "compact, precise, and efficient".

Compact: Its miniaturized design is designed to perfectly fit and be placed inside a glove box filled with inert gas (such as argon). The glove box is a critical environment for battery assembly, used to isolate battery materials that are extremely sensitive to absolute air and moisture, especially electrolytes and electrode materials.

Precision: aimed at solving the problems of poor accuracy, low repeatability, and easy spillage in manual liquid injection.

Efficient: By integrating vacuum and pressurization functions, the time for electrolyte to infiltrate electrode sheets has been significantly shortened, improving research and development efficiency.

2. Core working principle

vacuum liquid injection machine simulates and optimizes the industrial injection process, scaling it down to the laboratory level:

Placing the battery: Place the battery that needs to be filled with liquid (such as a soft pack cell) into a transparent vacuum chamber.

Vacuum pumping: Close the chamber door, start the vacuum pump, and pump the chamber to a high degree of vacuum. This step aims to extract the air inside the battery cell, create a pressure difference for the penetration of the electrolyte, and remove gases from the electrode material and membrane pores.

Precise injection: Under vacuum or specific pressure environment, a predetermined volume of electrolyte is accurately injected into the battery through a high-precision injection pump and needle.

Vacuum holding/soaking: After injection, the system can maintain a vacuum state for a period of time, allowing the electrolyte to more fully and quickly infiltrate every corner of the battery cell under negative pressure.

Pressure sealing (optional): Some models may have a pressure function, which can apply a positive pressure to the chamber after injection to assist the electrolyte in further penetration and simulate the process conditions for the final sealing of the battery.

Complete removal: Release pressure, open the chamber door, remove the battery that has been filled with liquid, and proceed with subsequent settling and sealing operations.

3. Key features and advantages

High precision injection: using a precision injection pump, the injection volume is precise and controllable, with good repeatability, ensuring the consistency and comparability of experimental data.

Significantly improved infiltration effect: The vacuum environment can effectively remove bubbles in the electrode pores, making the electrolyte distribution more uniform and greatly reducing the time required for traditional atmospheric pressure standing (from several hours or even tens of hours to several minutes to tens of minutes).

Improving safety: Operating in a sealed glove box environment reduces direct contact between the electrolyte and the human body, as well as exposure to volatile solvents. The systematic operation also avoids the possibility of spillage caused by manual injection.

Improving research and development efficiency: One device can standardize and batch process multiple battery samples, greatly accelerating the iteration speed of battery research and optimization.

Strong compatibility: Usually equipped with multiple specifications of fixtures and injection heads, it can adapt to various battery models from button batteries to small soft pack batteries.

Data traceability: It can record and save the process parameters (vacuum degree, injection volume, time, etc.) of each injection, facilitating the traceability and analysis of experimental data.

4. Typical application scenarios

Research and development of new battery materials: Ensure consistency in the injection process when testing the performance of different positive, negative, and electrolyte formulations.

Battery process optimization: Study the effects of different injection volumes, vacuum degrees, and immersion times on battery performance (such as capacity, cycle life, internal resistance).

Small batch high-quality battery preparation: providing experimental batteries with consistent and reliable performance for scientific research papers, patent applications, or customer samples.

Teaching and Demonstration: Used to showcase the professional manufacturing process of lithium-ion batteries.