Liquid injection device and liquid injection method for battery electrolyte

Abstract

The invention discloses a liquid injection device and a liquid injection method for a battery electrolyte, wherein the liquid injection device for the battery electrolyte comprises a fixed seat, a stop rod cylinder, a stop rod, a stop rod frame, a liquid injection cylinder, a liquid injection piston and an electrolyte transfer cup; the liquid injection cylinder is fixedly mounted on the upper side of the fixed seat, the stop rod cylinder is positioned right above the liquid injection cylinder, and the stop rod cylinder is mounted on the fixed seat through the stop rod frame; the electrolyte transfer cup is mounted on the lower side of the fixed seat, a sealing head is arranged at the lower end of the electrolyte transfer cup, and the liquid injection piston is plugged into the liquid injection transfer cup; and stop rod holes are arranged in the fixed seat, the liquid injection piston, the sealing head and the piston rod of the liquid injection cylinder, the piston rod of the stop rod cylinder is connected with the stop rod, and the stop rod sequentially penetrates through the stop rod holes of the piston rod of the liquid injection cylinder, the fixed seat and the liquid injection piston from top to bottom and is matched with the sealing head at the lower end of the liquid injection transfer cup. The liquid injection device disclosed by the invention has the advantages of short liquid injection time and very high liquid injection precision, and can be used for automatically clearing the residual electrolyte in a liquid injection port.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a battery electrolyte injection device and a liquid injection method. Background technique [0002] With the development of society, various electronic devices are used more and more widely, and the demand for batteries, especially lithium-ion batteries, is increasing year by year. The outer casing of the battery is generally divided into steel casing, aluminum casing and soft non-metallic casing. During the manufacturing process of the battery, the electrolyte needs to be injected into the outer casing. In the prior art, there are two main problems with the battery electrolyte: first, the injection time is long; and second, the injection accuracy is low. [0003] Chinese patent 201020198131.2 discloses a battery electrolyte injection machine, which includes a liquid storage tank, a liquid injection pipe, and a battery. There is a gas-liquid switching valve. When ...

AI Technical Summary

Problems solved by technology

In the prior art, there are two main problems with the battery electrolyte: first, the injection time is long; second, the injection accuracy is low

However, on the one hand, since the gauge is installed on the liquid injection pipeline, there is a section of liquid injection pipeline and gas-liquid switching valve between the gauge and the battery. Therefore, affected by the hysteresis of the electrolyte flow, even if the gauge can accurately control , there will be a deviation between the amount of electrolyte injected into the battery and the control amount of the meter, and the farther the meter is from the battery, the greater the deviation will be; on the other hand, the battery electrolyte injection machine will , and the residual electrolyte in the liquid injection port in contact with the battery cannot be cleaned in time. In this way, not only the electrolyte is easily bonded to the inner wall of the liquid injection port, it needs to be cleaned frequently, but the electrolyte is also very easy to drip out from the liquid injection port. , affect the working environment, and even affect the accuracy of the next injection

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