Multi-runner printing device based on battery pole piece coating and printing method thereof

Abstract

A multi-runner printing device based on battery pole piece coating comprises a slurry shunting plate, a slurry shunting pressing plate and a feeding connector, the slurry shunting plate and the slurry shunting pressing plate are connected to form runners, the feeding connector is communicated with the runners, the runners form a plurality of independent shunting units, the plurality of shunting units are formed on the slurry shunting pressing plate, and the slurry shunting pressing plate is connected with the feeding connector. The plurality of shunting units are arranged at equal intervals in the length direction of the slurry shunting pressing plate; the shunting unit forms a plurality of stages of two shunting runners from top to bottom, and the sectional area of each stage of shunting runner is equal to the sum of the sectional areas of the two shunting runners of the next stage communicated with the shunting runner; compared with the prior art, a multi-runner split-flow printing mode is adopted for coating, a direct coating printing forming mode is adopted for battery pole piece coating, and compared with a traditional battery pole piece coating mode, high-viscosity and high-solid-content slurry coating can be achieved, and the drying shrinkage stability of the coating is greatly improved on the premise that the coating precision is guaranteed.

Description

technical field [0001] The invention relates to the technical field of battery pole piece coating, in particular to a multi-channel printing device based on battery pole piece coating and a printing method thereof. Background technique [0002] With the iteration of battery production technology, there are higher requirements for battery production process and performance indicators. Among them, pole piece coating is one of the most important key technologies in the battery production process. Specifically, it means that the stability is good according to a certain thickness. The electronic paste with good viscosity is uniformly coated on the battery pole pieces. The pole piece coating is of great significance to the battery, which is mainly reflected in: the influence on the capacity of the finished battery. If the coating thickness is inconsistent at different positions of the pole piece during the coating process, It will cause the battery capacity to be too low or too hi...

AI Technical Summary

Problems solved by technology

Its advantage is that the pole piece is very uniform and has high precision after coating, and the coating edge has high flatness. The disadvantage is that the viscosity of the slurry must be guaranteed within a certain range, and it cannot be compatible with the coating requirements of high-viscosity slurry.

Its advantage is that the viscosity of the slurry is not high, it is easy to adjust the coating parameters, and there is no blocking material, etc. The disadvantage is that the coating accuracy is poor and the consistency of the pole piece cannot be guaranteed.

However, this patent does not consider the influence of the change of the cross-sectional area of ​​the flow channel between different stages, and the change of the cross-sectional area will lead to the pulsation of the slurry supply, resulting in unstable discharge flow and affecting the extrusion accuracy.

[0014] Existing coating technology, the uniformity of the discharge flow at the coating port is poor, and the discharge flow at the coating port refers to the different sizes of the discharge flow at different positions in the slit of the coating head, resulting in poor consistency of the coating thickness of the pole piece, which affects the battery. performance, and the existing coating technology, the efficiency of production changeover for different coating widths is low; according to the production requirements of different batteries, there are differences in the coating width and size of the pole piece slurry, so it is necessary to replace the corresponding coating according to different coating requirements. Coating head gaskets are currently replaced manually, and re-adjustment is required after replacement, and the efficiency of the changeover is low

Images