Anode tank shielding structure of electrolytic copper foil crude foil engine

Abstract

The utility model discloses an anode tank shielding structure of an electrolytic copper foil crude foil engine, which comprises an anode tank and an overflow tank, an anode plate is arranged at the upper part of the anode tank, and the overflow tank is attached to the outer side of the anode plate; an acid-resistant shielding plate is arranged on the inner surface of the upper part of the anode plate, and a structure for isolating the anode plate from the electrolyte is formed through the shielding plate; and a guide plate is arranged at the top end of the anode plate, is in sealed connection with the shielding plate to cover a gap between the shielding plate and the anode plate, and leads to the overflow groove. According to the utility model, the shielding plate is arranged to shield the anode plate part at the uppermost end of the anode tank so as to avoid electrodeposition reaction in an area with unstable electrolyte flow, so that the electrodeposition reaction is always in an area with higher electrolyte flow uniformity, and the problem of non-uniform electrodeposition copper foil at the anode plate at the overflow port of the anode tank can be solved; the uniformity of the density of the copper foil is improved, and the defects of copper foil pinholes, seersucker and the like are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic copper foil production equipment, in particular to an anode tank structure of an electrolytic copper foil production machine. Background Art

[0002] With the development of the lithium battery industry, the volume of lithium batteries is currently required to develop in a smaller direction. The thickness of the electrolytic copper foil, which is the negative electrode current collector of lithium batteries, should also become thinner and thinner, developing in the direction of ultra-thinness. The demand for electrolytic copper foil in the lithium battery market has shifted from the mainstream 10μm and 8μm to 6μm, and will then develop in the direction of ultra-thinness of 4μm and 3μm. The thinner the copper foil, the easier it is to produce problems such as nail marks, pinholes, and uneven thickness, which is currently a major obstacle restricting the industry from developing thinner products.

[0003] The foil machine is a key equipment for the production of electrolytic copper foil. It consists of two parts: the anode tank and the cathode roller. The anode tank is a key component of the foil machine. The tank body is mainly made of all-titanium material. Electrolytic copper foil production generally uses insoluble anode DSA, pure titanium roller as cathode, and copper sulfate as electrolyte. Under the action of the electric field, copper ions migrate to the cathode roller in the copper sulfate electrolyte and are reduced to copper atoms (reaction formula: Cu 2+ +2e - →Cu), deposited as copper foil of a certain thickness, and formed into a roll copper foil under the condition of continuous peeling. The thickness uniformity and apparent quality are important indicators for considering the quality of electrolytic copper foil.

[0004] Raw foil is the most important step in the production process of electrolytic copper foil. The raw foil process largely determines the physical properties and apparent quality of the final electrolytic copper foil. However, in the production of ultra-thin electrolytic copper foil, defects such as uneven thickness, pinholes, and nail marks of copper foil seriously affect the product quality, and unqualified copper foil needs to be recycled for secondary liquid foil making, which consumes huge energy. When the raw foil machine is working, copper sulfate electrolyte is pumped from the bottom of the anode tank to the area between the anode plate and the cathode roller for electrodeposition and foil making. Due to various factors such as uneven flow of electrolyte at each point, uneven distance between the cathode and cathode, and uneven material of the anode and cathode, the amount of electrolytic deposition at each position on the cathode roller is uneven, resulting in excessive deviation in the uniformity of the thickness of the copper foil produced. According to research, the anode plate and cathode roller located in the middle and lower part of the anode tank can collect foil, but the unevenness of the copper foil electrodeposited at the anode plate located at the overflow port of the anode tank is particularly obvious. The main reason is that because this area is located on the liquid surface, its flow non-uniformity is more significant, resulting in a large deviation in the concentration of copper ions "passing" through this area, which in turn causes greater non-uniformity in the copper foil.

[0005] In addition, during the electrolytic copper foil process, as the cathode roller rotates, when the copper foil on the roller surface of the cathode roller is peeled off, the cathode roller contacts the air, which will produce nail marks, oxidation points and other phenomena on the roller surface. If the roller surface in contact with the air is not treated, it will cause defects such as electroplating stripes on the surface of the prepared copper foil. At present, the industry usually uses acid spraying treatment to solve the above problems, such as the automatic acid spraying and cleaning device of the electrolytic copper foil production machine disclosed in patent 202121270781.8, which can solve the acid points and nail marks on the surface of the copper foil by controlling the stability of the flow rate of the acid spraying electrolyte. However, there are still many defects in actual production, such as, 1) the sprayed copper sulfate electrolyte will produce a large amount of acid gas, resulting in the deterioration of the production environment and the appearance of acid mist point defects on the surface of the copper foil; 2) the acid spraying tube is designed with an acid spraying hole, which is very easy to cause the acid spraying hole to be blocked, and the cleaning procedure is cumbersome, which affects the quality of the copper foil, affects the production efficiency, and increases the labor intensity; 3) a separate liquid supply system needs to be set up, which will increase the production cost. There is currently no good solution to these problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an anode tank shielding structure for an electrolytic copper foil producing machine with a simple structure, low cost and good effect, which can solve the problem of uneven electrodeposition of copper foil at the anode plate at the overflow port of the anode tank.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions: an anode tank shielding structure of an electrolytic copper foil production machine, comprising an anode tank and an overflow tank, the upper part of the anode tank is provided with an anode plate, and the overflow tank is attached to the outer side of the anode plate, and is characterized in that: an acid-resistant shielding plate is arranged on the upper inner surface of the anode plate, and a structure is formed by the shielding plate to isolate the anode plate from the electrolyte; a guide plate is arranged on the top of the anode plate, and the guide plate is sealed and connected to the shielding plate to cover the gap between the shielding plate and the anode plate, and the guide plate leads to the overflow tank.

[0008] Furthermore, a layer of acid-resistant double-sided adhesive is attached to the upper part of the anode plate, and the shielding plate is attached to the acid-resistant double-sided adhesive to achieve combination and fixation with the anode plate.

[0009] Furthermore, the shielding plate completely covers the upper half of the entire anode plate to cover enough areas of uneven copper ions in the electrolyte.

[0010] Preferably, the shielding plate is made of acid-resistant Teflon material, and the acid-resistant double-sided adhesive tape is made of Teflon tape.

[0011] Furthermore, the guide plate is vertically arranged at the top of the anode plate, and the guide plate is welded to form a vertical connection structure with the shielding plate to cover the acid-resistant double-sided adhesive from above.

[0012] Furthermore, a flange is provided between the outer side of the anode plate and the overflow tank, and a guide plate is placed on the flange to lead to the overflow tank.

[0013] Preferably, the guide plate is made of Teflon material with a thickness of 2-3 cm.

[0014] The utility model shields the anode plate at the top of the anode tank by setting a shielding plate to avoid electrodeposition reaction in the area where the electrolyte flow is unstable, so that the electrodeposition reaction is always in the area with high electrolyte flow uniformity, so as to solve the problem of uneven electrodeposition of copper foil at the anode plate at the overflow port of the anode tank, improve the uniformity of copper foil density, and reduce the generation of defects such as copper foil pinholes and seersucker. In addition, the surface of the cathode roller can be cleaned in the shielding area, and the traditional acid spray cleaning device is abandoned to avoid acid spots and nail marks on the surface of the copper foil, reduce the labor intensity of personnel, improve product quality, and reduce the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model.

[0016] In the figure, 1 is an anode tank, 2 is an anode plate, 3 is an acid-resistant double-sided tape, 4 is a shielding plate, 5 is a guide plate, 6 is an overflow trough, and 7 is a flange. DETAILED DESCRIPTION

[0017] In this embodiment, refer to Figure 1 The anode tank shielding structure of the electrolytic copper foil production machine includes an anode tank 1 and an overflow tank 6. The upper part of the anode tank 1 is provided with an anode plate 2, and the overflow tank 6 is close to the outer side of the anode plate 2; an acid-resistant shielding plate 4 is arranged on the upper inner surface of the anode plate 2, and a structure is formed by the shielding plate 4 to isolate the anode plate 2 from the electrolyte, so that no electrodeposition reaction occurs in this area, and the electrodeposition foil production occurs in the middle and lower part of the anode tank 1, ensuring that the uniformity of the copper foil thickness returns to normal and meets the standard requirements; a guide plate 5 is arranged on the top of the anode plate 2, and the guide plate 5 is sealed and connected with the shielding plate 4 to cover the gap between the shielding plate 4 and the anode plate 2 to prevent the electrolyte from penetrating and contacting the anode plate 2, and the guide plate 5 leads to the overflow tank 6, and the overflowed electrolyte directly flows into the overflow tank 6 through the guide plate 5.

[0018] A layer of acid-resistant double-sided adhesive 3 is attached to the upper part of the anode plate 2, and the shielding plate 4 is adhered to the acid-resistant double-sided adhesive 3 to be fixed to the anode plate 2. The assembly operation is simple and convenient, and no drilling is required, and the structural integrity of the anode plate 2 will not be damaged.

[0019] The shielding plate 4 completely covers the upper half of the entire anode plate 2 to cover enough areas of uneven copper ions in the electrolyte.

[0020] The shielding plate 4 is made of acid-resistant Teflon or other materials, and the acid-resistant double-sided adhesive tape 3 is made of Teflon tape or other materials.

[0021] The guide plate 5 is vertically arranged at the top of the anode plate 2, and the guide plate 5 forms a vertical connection structure with the shielding plate 4 by welding to cover the acid-resistant double-sided adhesive tape 3 from above, thereby playing the role of corrosion prevention and flow stabilization.

[0022] A flange 7 is provided between the outer side of the anode plate 2 and the overflow trough 6 , and the guide plate 5 is placed on the flange 7 to lead to the overflow trough 6 .

[0023] The guide plate 5 is made of Teflon material with a thickness of 2-3 cm (such as 2.5 cm).

[0024] This can also replace the acid spraying device of the foil production machine. This is because after the cathode roller enters the liquid and does not participate in the electrodeposition reaction, the surface of the cathode roller will be cleaned as the electrolyte overflows quickly, solving the problem of defects such as electroplating stripes and fingernail marks on the surface of the copper foil caused by oxidation of the cathode roller.

[0025] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. An anode tank shielding structure of an electrolytic copper foil production machine, comprising an anode tank and an overflow tank, wherein the upper part of the anode tank has an anode plate, and the overflow tank is attached to the outer side of the anode plate, characterized in that: An acid-resistant shielding plate is provided on the upper inner surface of the anode plate, and a structure is formed by the shielding plate to isolate the anode plate from the electrolyte; a guide plate is provided on the top of the anode plate, and the guide plate is sealedly connected to the shielding plate to cover the gap between the shielding plate and the anode plate, and the guide plate leads to the overflow trough.

2. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 1 is characterized in that: A layer of acid-resistant double-sided adhesive is attached to the upper part of the anode plate, and the shielding plate is attached to the acid-resistant double-sided adhesive to achieve combination and fixation with the anode plate.

3. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 1, characterized in that: The shielding plate completely covers the upper half of the entire anode plate.

4. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 1, characterized in that: The shielding plate is made of acid-resistant Teflon material.

5. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 2, characterized in that: The acid-resistant double-sided adhesive tape is made of Teflon material.

6. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 2, characterized in that: The guide plate is vertically arranged on the top of the anode plate, and the guide plate forms a vertical connection structure with the shielding plate through welding to cover the acid-resistant double-sided adhesive from above.

7. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 6, characterized in that: A flange is provided between the outer side of the anode plate and the overflow tank, and a guide plate is placed on the flange to lead to the overflow tank.

8. The anode tank shielding structure of the electrolytic copper foil production machine according to claim 1, characterized in that: The guide plate is made of Teflon material with a thickness of 2-3 cm.

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