Lithium battery liquid injection head

Abstract

The invention relates to a lithium battery liquid injection head, and the injection head comprises a liquid injection cavity, wherein one end of the liquid injection cavity is a sealed end, the other end of the liquid injection cavity is a liquid injection end, a liquid injection needle is installed in the liquid injection end and communicated with the interior of the liquid injection cavity, a vacuum cavity is installed outside the liquid injection end, a battery jar for accommodating a lithium battery is arranged at the outer end part of the vacuum cavity, a liquid outlet head of the liquid injection needle corresponds to a liquid injection hole in the lithium battery in position, and the liquid injection needle is communicated with the interior of the vacuum cavity; a liquid injection sealing rod used for sealing the liquid injection needle is arranged in the liquid injection cavity, and a driving piece is arranged at the outer end of the liquid injection sealing rod. The lithium battery liquid injection head has the advantages of simple structure, high liquid injection efficiency, good liquid injection effect and the like.

Description

technical field [0001] The invention relates to the technical field of liquid injection for lithium batteries, in particular to a liquid injection head for lithium batteries. Background technique [0002] For the liquid injection operation of lithium batteries, at present, the traditional vacuum suction liquid injection is mainly used, that is, the lithium battery is placed upside down in the electrolyte by manual operation, and the air in it is pumped out, and the electrolyte enters the lithium battery under the action of atmospheric pressure. battery. When this method is used for liquid injection, it has the following disadvantages: 1. The electrolyte is taken away by the steel case and cap surface of the lithium battery more, resulting in a waste of electrolyte; 2. The surface of the lithium battery is easily corroded, which affects the appearance of the lithium battery. Beautiful; 3. Putting the battery into the electrolyte and taking it out of the electrolyte by manual...

AI Technical Summary

Problems solved by technology

When this method is used for liquid injection, it has the following disadvantages: 1. The electrolyte is taken away by the steel case and cap surface of the lithium battery more, resulting in a waste of electrolyte; 2. The surface of the lithium battery is easily corroded, which affects the appearance of the lithium battery. Beautiful; 3. Manually put the battery into the electrolyte and take it out of the electrolyte, it takes a long time and the efficiency is low

However, it uses vacuum equipment to evacuate the whole battery or battery pack at the same time, and the vacuuming volume of each battery is inconsistent, resulting in uneven negative pressure in each battery during the liquid injection process, and the negative pressure rate is low, which leads to the injection of each battery. There is a problem of inconsistent high and low liquid volume

For batteries with a high negative pressure rate, the liquid injection volume will be too high, and even overflow the surface of the battery, causing corrosion to the battery

For batteries with a low negative pressure rate, the liquid injection volume will be too low, resulting in insufficient liquid injection in the battery

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