Method for wetting polymer lithium ion batteries

Abstract

The invention belongs to the field of technologies for wetting batteries, and relates to a method for wetting polymer lithium ion batteries. The method is used for wetting the polymer lithium ion batteries by the aid of an ultrasonic cleaning device. The method particularly includes steps of enabling battery air bags filled with liquid to upwardly and vertically stand in a water tank of the ultrasonic cleaning device; filling pure water into the water tank and submerging pole groups of the batteries in the surface of the pure water under the control; heating the pure water under the control to enable the temperature of the pure water to range from 23 DEG C to 27 DEG C, enabling the frequencies of ultrasonic waves to range from 50KHz to 70KHz under the control, and ultrasonically wetting the polymer lithium ion batteries for 1.0-2.0 hours; taking the wetted batteries out of the water tank and drying the batteries by a hot air device. The method for ultrasonically wetting the polymer lithium ion batteries has the advantages that diffusion of organic electrolyte inside the batteries, particularly in gaps among pole pieces and diaphragms of the batteries, can be promoted by the aid of ultrasonic oscillation, wetting the insides, particularly the gaps among the pole pieces and the diaphragms, of the batteries by the organic electrolyte can be promoted by the aid of ultrasonic oscillation, accordingly, the standing time can be greatly shortened, and production energy consumption can be reduced; an effect which is identical to an effect realized by a conventional method for wetting polymer lithium ion batteries at high temperatures can be realized, the production cost can be reduced, and the production efficiency can be improved; the method is high in practicality and is applicable to wetting various models of batteries.

Description

technical field [0001] The invention belongs to the technical field of battery infiltration, and in particular relates to an infiltration method for a polymer lithium ion battery. Background technique [0002] After the battery is filled with liquid, the electrolyte does not completely soak into the inside of the electrode group quickly, and part of the electrolyte will concentrate in the space of the upper air pocket of the electrode group, and these electrolytes need a long standing time to fully infiltrate the electrode group internal. Therefore, in the lithium-ion polymer battery industry, the battery often needs to be left standing at a high temperature for a long time after liquid injection to ensure that the electrolyte fully infiltrates the battery. This process increases energy consumption and wastes time, which is not conducive to reducing costs and improving production efficiency. [0003] With the continuous pursuit of the energy density of polymer lithium-ion ...

AI Technical Summary

Problems solved by technology

In the figure, the distance between the particles in the circled area 28 is larger, that is to say, the porosity of the pole piece in this area is larger, so the electrolyte is easier to infiltrate when it flows through here (reaction in the figure That is, there are more arrows in the area); on the contrary, the distance between the particles in the circled area 29 in the figure is very small, that is, the porosity of the pole piece in this area is relatively small, so the electrolyte will be relatively small when it flows through here. Difficult to infiltrate (the reaction in the figure is that there are fewer arrows in this area), which requires a long period of high temperature standing, and even in time, it is difficult for the electrolyte to fully infiltrate between the active material particles

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