Steel shell cylindrical lithium-ion battery is a very critical process in the liquid injection process, and the injection precision control of electrolyte

 is very important. When cylindrical lithium-ion battery is injected, the first electrolyte can not be injected more, which will lead to leakage when 

the battery is sealed or cause the safety valve to burst when charging. The second liquid injection amount is too low will cause the battery internal

 resistance to increase, easy to reach, may cause fire and explosion.

At present, the injection of cylindrical batteries is still a bottleneck, due to the influence of the positive and negative electrode sheets of the battery 

through the roller surface density and the tightness of the cell when winding, if 5.6 grams is injected at the time of injection, the electrolyte is difficult

 to quickly penetrate into the electrode sheet due to the limited space volume capacity of the battery housing. With the increasing chemical composition 

of positive and negative electrode plates, diaphragms, and electrolytes, the battery capacity is pursued more and more. Most of the domestic battery

 manufacturing enterprises and injection machine equipment enterprises to develop a new and simple production of high tempo, but also low cost of 

cylindrical battery multi-stage injection machine.

The basic principle of the multi-stage injection machine is to adopt the step injection test method. If our injection volume is 5.6 grams,

 we will take a split injection. After 1.6 grams of electrolyte is injected into the first injection pump, 1.5 grams of electrolyte is injected into

 the second injection pump, and static infiltration is completed. After static infiltration is completed, 1 gram of electrolyte is injected into 

the third injection pump, and 1 gram of electrolyte is injected into the fourth injection pump, and static infiltration is completed. 

The fifth injection pump injected 0.5 grams of electrolyte, and the final injection of battery was completed after the completion of static infiltration.

Although the injection bottleneck can not be completely solved through this process, the injection accuracy is fully guaranteed under the cooperation 

of Ji kerr injection pump, and the phenomenon of electrolyte overinjection or underinjection will no longer occur.  At the same time, the production 

capacity has also been a leap, on the basis of the original to improve the production capacity of at least 2.

Ji kerr injection pump application site