Liquid injection method and fixture for a square lithium-ion battery

Abstract

The invention provides a liquid injecting method and a clamp of a square lithium ion battery. The thickness of the clamp of the square lithium ion battery is controllable. The liquid injecting method of the square lithium ion battery comprises the following steps: before injecting liquid, preparing a liquid injecting clamp at first, placing a plurality of to-be-liquid-injecting batteries between two battery separators of the clamp in a flat mode, controlling the distance between the battery separators, tightly twisting bilateral side bolts, and further placing the clamp which clamps the batteries to start reversing absorbing type liquid injection. The liquid injecting method of the square lithium ion battery has the advantages of effectively controlling the thickness of the batteries, improving a use ratio of electrolyte, thereby improving quality yield of the lithium battery and possessing great practical significance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to the field of manufacturing lithium ion batteries. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles and electric bicycles. As well as large and medium-sized electric equipment such as electric tools, the requirements for the quality pass rate of lithium-ion batteries are getting higher and higher. [0003] Electrolyte is an important part of lithium-ion batteries. During the manufacturing process of lithium-ion batteries, the electrolyte needs to be injected through the liquid injection hole on the battery. At present, the injection modes of lithium-ion batteries are mainly divided into vacuum injection and suction injection. ...

AI Technical Summary

Problems solved by technology

However, this structural mode has the following defects: 1) After each injection cycle of the liquid injection machine, there is still electrolyte in the needle tube, which cannot guarantee the amount of liquid injected for each battery; 2) The liquid injection machine and the operator work at the same time In an atmospheric environment, it is not conducive to the stability of the environment; 3) It is necessary to manually place the battery into the station and take the battery out of the station after completing the liquid injection, and the production efficiency is low

The back-suction liquid injection injects a large amount of electrolyte at one time, which can meet the requirements of the process standard, but there are also the following defects: 1) The battery absorbs too much electrolyte, which causes the thickness of the battery to exceed the standard; 2) The excess electrolyte needs to be removed in subsequent operations. Squeeze out, resulting in waste of electrolyte, and a large amount of electrolyte remaining on the surface of the battery seriously affects the appearance of the battery

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