COATING APPARATUS
Provided are a coating apparatus that can form a high-accuracy pattern coating on a base film, thereby improving the performance of components including the base film (such as current collectors). The coating apparatus includes: a coating-resistance pattern unit configured to form a pattern composed of a coating-resistance substance on a partial area of the surface of a base film, where the coating-resistance substance is used to restrict metal vapor from forming a coating; and a coating unit configured to apply the metal vapor to the base film with the pattern, so as to form a metal coating on the area of the surface of the base film where the coating-resistance substance is not provided.
1 . A coating apparatus, comprising:
a coating-resistance pattern unit configured to form a pattern composed of a coating-resistance substance on a partial area of a surface of a base film, the coating-resistance substance being used to restrict metal vapor from forming a coating; and
a coating unit configured to apply the metal vapor to the base film with the pattern, so as to form a metal coating on the area of the surface of the base film where the coating-resistance substance is not provided.
2 . The coating apparatus according to claim 1 , wherein the coating-resistance pattern unit comprises:
a heating roller configured to heat the coating-resistance substance; and
a pattern roller with the pattern provided on the surface to print the heated coating-resistance substance on the base film in a shape of the pattern when the base film passes over the pattern roller, so as to form the pattern on the partial area of the surface of the base film.
3 . The coating apparatus according to claim 2 , wherein the coating-resistance pattern unit further comprises:
a bottom roller arranged side by side with the pattern roller on two sides of the base film, where when the base film passes between the pattern roller and the bottom roller, the coating-resistance substance on the pattern roller is formed on the partial area of the surface of the base film in the shape of the pattern under a pressure between the pattern roller and the bottom roller.
4 . The coating apparatus according to claim 2 , wherein the coating-resistance pattern unit further comprises:
an anilox roller arranged between the heating roller and the pattern roller, where the surface of the anilox roller is provided with a plurality of pits, the pits are used to store the heated coating-resistance substance, and the anilox roller is used to transfer the stored heated coating-resistance substance to the pattern roller.
5 . The coating apparatus according to claim 2 , wherein the pattern roller is a roller made of rubber.
6 . The coating apparatus according to claim 1 , further comprising:
a cooling unit configured to cool the base film with the pattern after the pattern is formed on the partial area of the surface of the base film.
7 . The coating apparatus according to claim 6 , wherein the cooling unit comprises:
a cold drum configured to transfer and cool the base film with the pattern, where the cold drum is provided as a hollow structure, and the hollow structure contains a cooling liquid to cool the base film with the pattern in a process of circulation.
8 . The coating apparatus according to claim 7 , wherein the surface of the cold drum is coated with an insulating material.
9 . The coating apparatus according to claim 8 , wherein a thickness of the insulating material is 30 um-200 um.
10 . The coating apparatus according to claim 7 , wherein the cooling unit further comprises:
a bias roller arranged downstream of the cold drum in the transferring direction of the base film to adsorb the base film with the pattern to the surface of the cold drum.
11 . The coating apparatus according to claim 10 , wherein the cold drum is grounded and the bias roller is connected to a negative voltage.
12 . The coating apparatus according to claim 7 , wherein the cooling unit further comprises:
a gas cooling tube including a heat-conducting medium which is introduced by the gas cooling tube through a gas port to a position between the cold drum and the base film with the pattern, so that the heat-conducting medium cools the base film with the pattern.
13 . The coating apparatus according to claim 12 , wherein the heat-conducting medium is an inert gas.
14 . The coating apparatus according to claim 7 , wherein the coating unit comprises a vacuum coating mechanism configured to deliver metal vapor toward the base film on the cold drum.
15 . The coating apparatus according to claim 1 , wherein the coating-resistance substance is silicone oil.
16 . The coating apparatus according to claim 1 , wherein the thickness of the metal coating is 1 um-3 um.
17 . The coating apparatus according to claim 1 , wherein the base film is a polyethylene terephthalate PET film.
18 . The coating apparatus according to claim 1 , wherein the metal vapor is copper vapor or aluminum vapor.