Sieving flow rate measuring method of lithium ion battery sizing agent

Abstract

The invention provides a sieving flow rate measuring method of a lithium ion battery sizing agent. The sieving flow rate measuring method of the lithium ion battery sizing agent comprises the following steps: (1) a gas valve of a sizing agent storage tank is opened, pressure stabilizing gas is introduced into the sizing agent storage tank, then the gas valve is closed, then a discharging valve isclosed after being opened to deflate the gas, and then a feeding cover is opened; (2) the sizing agent is poured into the sizing agent storage tank, a sieve net is installed at a discharging port of the sizing agent storage tank, then the discharging port is closed; (3) feeding gas pressure of a coating machine is simulated, the gas valve is opened and the pressure stabilizing gas continuous to beintroduced into the sizing agent storage tank, after the gas pressure reaches a set value and maintains stable, the discharging port is opened, the sizing agent flowing out is received and taken, meanwhile timing is started, and when the set value of the discharging time is reached, the discharging port is immediately closed; and (4), the sizing agent flowing out is weighed, and the quality of the sizing agent flowing out in unit time and the unit screen area is calculated to obtain the flow speed of the sizing agent. According to the sieving flow rate measuring method of the lithium ion battery sizing agent, compared with the prior art, the sieving efficiency of the sizing agent can be effectively improved, and the net blocking phenomenon of the sizing agent is avoided.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for measuring the sieving flow rate of lithium ion battery slurry. Background technique [0002] The production process of lithium-ion batteries includes processes such as homogenization, coating, rolling, slitting, winding, liquid injection, sealing, pre-charging, aging and sorting. The conditions of each process will affect the performance of the battery. Among them, the coating process has a greater impact on the production capacity and the consistency of the pole pieces. Whether the coating is smooth or not determines the production speed of the subsequent process, and whether the surface density of the coating pole pieces is uniform determines the consistency of the cell capacity. Therefore, the coating process is crucial for lithium-ion battery production. [0003] The properties of the slurry greatly affect the stability of the coating. In the general lithiu...

AI Technical Summary

Problems solved by technology

However, for slurries with poor properties and difficult sieving, the consistency of the pole pieces is generally poor. At the same time, due to the difficulty of sieving, it is easy to sieve and block the screen. The production of sizing block is mainly composed of the following Several factors caused: (1) slurry settlement; (2) uneven slurry dispersion; (3) dry mixing process slurry binder not completely dissolved; (4) large particles in the slurry; (5) There are many extremely fine particles in the slurry, which leads to the agglomeration of particles; (6) the mesh itself is difficult to clean the residual material due to the long use time; (7) the power of the delivery pump is small; (8) the delivery pipeline is blocked

[0004] The above-mentioned slurry blockage will seriously affect the production efficiency. It is necessary to re-adjust the homogenization process, and then go through sieving and other operations for trial coating. normal use of equipment

Images