Spraying device for film surface of secondary battery

Abstract

The invention discloses a spraying device for the film surface of a secondary battery. The spraying device comprises a coating frame (10) arranged horizontally. A film base material (6) is transversely placed at the top of the coating frame (10). A first coating set and a second coating set are installed on the top face of the film base material (6) in a spaced manner. The first coating set and the second coating set are used for carrying out interval coating on the top face of the film base material (6) in an alternating manner. The spraying device for the film surface of the secondary battery enables coating speed to be free of restriction of an interval coating process while increasing the coating speed of a coating machine substantially, and the effect of effectively reducing coating intervals is ensured, so that larger capacity of the battery is ensured. Product use experience of users is improved easily, wide application and popularization of the high-capacity secondary battery are promoted, and the spraying device has great production practice significance.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a spray coating device for the thin film surface of a secondary battery. Background technique [0002] At present, in the secondary battery (rechargeable battery) production industry, the technology used to coat the surface of the metal film of the battery is generally used as a spray coating process, and the structure of the equipment is to design a set of coating heads on each side of the metal film. The way in which the coating is carried out. However, with the continuous improvement of secondary battery technical requirements, limited by the fact that secondary batteries need to be coated at intervals during coating to reserve the welding position of tabs, the increase in capacity requires shorter and shorter coating blank intervals. It is contradictory to increase the production capacity and require the coating speed of the coating equipment to be faster and f...

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of secondary battery technical requirements, limited by the fact that secondary batteries need to be coated at intervals during coating to reserve the welding position of tabs, the increase in capacity requires shorter and shorter coating blank intervals. It is contradictory to increase the production capacity and require the coating speed of the coating equipment to be faster and faster

[0003] Therefore, in order to ensure the blank interval, the speed increase of the coating equipment is greatly restricted.

At present, the interval coating speed for secondary battery coating equipment is mostly 20-30m / min, while the minimum coating blank interval for secondary batteries is only about 5mm, and the continuous coating length is about 200-1000m. According to the calculation based on the fastest coating speed of 30m / min (ie 0.5mm / ms) of coating equipment at the present stage, when the blanking interval of coating is 5mm, then, it is necessary to realize the coating by solenoid valve or The pneumatic valve controls the nozzle to close and open once. This speed is already the current limit speed. If it works continuously at this speed, the life of the solenoid valve will be greatly shortened, and the coating quality cannot be guaranteed.

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