Anode tank shielding plate for electrolytic copper foil

Abstract

The utility model provides an anode tank shielding plate for electrolytic copper foil, which comprises an installation area, a shielding plate, a shielding plate, a shielding plate, a shielding plate and a shielding plate, and is characterized in that one end of the installation area is fixed on the side wall of an anode tank; the shielding area is connected with the other end of the mounting area; the shielding area is positioned between the cathode roller and the anode plate and is parallel to a roller shaft of the cathode roller; the shielding area is divided into an adjusting area and a rinsing area in the width direction, the rinsing area is close to the mounting area, the adjusting area is divided into a plurality of small adjusting areas in the length direction, and the widths of the small adjusting areas are the same; the length of the small adjusting area is shortened according to the copper deposition unit area mass, detected by the online monitoring system, corresponding to the small adjusting area; the adjusting area can stretch towards the rinsing area. On the premise that the concentration of electrolyte is not changed, the structure of the anode plate is not changed and the surface of the cathode roller is not damaged, the uniformity and the consistency of the mass of the electrolytic copper foil per unit area are improved, the generation of waste foil is reduced, the yield of the copper foil is effectively improved, and the device has universality.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic copper foil, in particular to an anode tank shielding plate used for electrolytic copper foil. Background Art

[0002] Electrolytic copper foil is not only the current collector of the negative electrode of new energy batteries, but also a key material for making lead frames in electronic products. Its quality directly affects the performance and production cost of new energy batteries and electronic products.

[0003] The core equipment for making electrolytic copper foil is the foil machine, which is mainly composed of an anode tank (with a built-in anode plate), a cathode roller and other guide rollers, and a motor. The anode tank is semicircular, and there is an anode plate on the inner surface of the anode tank, which is fixed with screws. There are two symmetrical upper liquid ports on the left and right at the bottom of the anode tank, and the electrolyte flows quickly from the upper liquid port to the overflow port. The distance between the anode tank and the cathode roller is the pole distance. When producing electrolytic copper foil, a certain intensity of current is applied to the cathode and the anode, and the copper sulfate electrolyte flows in it. The divalent copper ions are deposited on the cathode roller to form a single copper substance, which is then peeled and wound to form a roll of continuous copper foil. The mass per unit area and the extreme difference in mass per unit area are both important indicators for measuring the quality of copper foil.

[0004] In the production process of electrolytic copper foil, there are inconsistencies in the concentration distribution of copper sulfate electrolyte between the cathode roller and the anode plate, inconsistencies in the anode plate material, inconsistencies in the distance between the cathode and the cathode, etc., which can easily lead to inconsistent amounts of copper electrodeposition in various areas on the cathode roller, and thus to uneven quality per unit area of ​​the produced copper foil. The overflow port of the anode tank is at the edge of the electrolyte, where the electrolyte inhomogeneity is more obvious, resulting in more obvious inconsistency in the amount of copper deposited in this area, which leads to the generation of a large amount of waste foil, resulting in cost and energy waste.

[0005] A search for anode slot shielding plates of foil-making machines that can control the consistency of the amount of copper deposited on the surface of the cathode roller revealed that patent CN115216813A adjusts conventional anode plates into multiple short anode plates along the width direction, each of which is connected to an independent DC power supply, and then detects the thickness of the copper foil in the width direction, controls the flow of copper sulfate electrolyte at the independent DC power supply and the secondary liquid inlet in a linkage manner, and flexibly controls the current of the short anode plates to achieve regulation of the consistency of the transverse thickness of the copper foil. However, the patent still has the following problems: short gaps between short anode plates are prone to breakdown, resulting in circuit failure; high energy consumption; adjacent electrolyte flow areas interfere with each other, resulting in unstable electrolyte concentration, which causes unstable thickness of the copper foil in the width direction, which is not conducive to mass production.

[0006] Patent CN114990644A reduces the width of the copper foil by coating the insulating shielding material on the edge of the cathode roller. However, this method requires heating and curing the insulating material coated on the roller, and removing the failed insulating material by grinding with a grinding wheel. This directly affects the grain structure and roughness of the cathode roller surface, greatly reducing the surface performance of the subsequently generated copper foil. Therefore, this method is not sustainable.

[0007] Patent CN117328110A uses multiple partition plates perpendicular to the roller axis of the cathode roller to divide the electrolytic cell into multiple small cells, and controls the electrolyte flow in each small cell through a flow control device to obtain copper foil with a target thickness. However, there is a certain gap between the partition plate and the cathode roller, and the partition plate has a certain thickness, which causes the electrolyte flow areas of the small electrolytic cells to interfere with each other, which can easily lead to unstable copper foil thickness near the partition plate, or even no copper foil is generated.

[0008] The Chinese utility model patent with the authorization announcement number CN210826398U discloses a shielding plate for an electrolytic copper foil anode tank, which can shield the unstable electrolyte pressure in the early stage of the anode plate; adjust the shape of the anode plate in the later stage of use, shield the points with large flow on the anode plate, and do not shield the points with small flow, so as to ensure the uniformity of the thickness of the copper foil. However, this patent adopts a fixed shielding part, and the shielding part has no rinsing area, which cannot be applied to multiple different foil production machines, nor can it be used to prepare copper foils of different specifications on the same foil production machine. The versatility of this shielding plate is not high.

[0009] In view of this, it is urgently necessary to develop an anode tank shielding plate for electrolytic copper foil, which can improve the consistency of copper foil thickness, be applicable to different times of the foil production machine, and can be used to prepare copper foils of different thicknesses on the same foil production machine, so as to solve at least one of the above problems. Utility Model Content

[0010] In view of the defects in the prior art, the utility model aims to provide an anode tank shielding plate for electrolytic copper foil.

[0011] The utility model is realized by the following technical solutions:

[0012] The utility model provides an anode tank shielding plate for electrolytic copper foil, comprising:

[0013] An installation area, one end of which is fixed to the side wall of the anode tank, and the installation area is arranged horizontally;

[0014] A shielding area connected to the other end of the mounting area, the shielding area is located between the cathode roller and the anode plate, and the shielding area is parallel to the roller axis of the cathode roller;

[0015] The shielding area is divided into an adjustment area and a rinsing area along the width direction, the rinsing area is close to the installation area, and the adjustment area is divided into multiple small adjustment areas along the length direction, and the widths of multiple small adjustment areas are the same; the length of the small adjustment area is shortened according to the copper deposition unit area mass corresponding to the small adjustment area detected by the online monitoring system; the rinsing area has a cavity structure, the rinsing area is sleeved on the outside of the adjustment area, the adjustment area can be extended into the cavity structure of the rinsing area, and the rinsing area provides adjustment space for the adjustment area when it is extended and retracted.

[0016] Furthermore, the installation area and the shielding area form an angle of 45° to 90°.

[0017] Furthermore, the shortening process refers to taking the maximum value of the raw foil mass per unit area as a reference value, and reducing the length of each small adjustment area according to the difference between the mass per unit area of ​​each small adjustment area and the reference value.

[0018] Furthermore, the reduction range of the small adjustment area is: for every 1g / m 2 The difference corresponds to a reduction of 10 to 30 mm in length of the small adjustment zone.

[0019] Furthermore, the reduction range of the small adjustment area is upper limited to 100 mm.

[0020] Furthermore, when the length of each small adjustment area is reduced, the lines between each small adjustment area are transitioned with arc lines.

[0021] Furthermore, the 35 mm areas on both sides along the length direction of the shielding area are adjusted according to the line trend of the adjacent areas.

[0022] Furthermore, the adjustment area is divided into 5 to 50 small adjustment areas along the length direction.

[0023] Furthermore, the installation area is fixed to the side wall of the anode tank by any one of bolts, hooks and clamping structures.

[0024] Furthermore, the installation area and the shielding area are made of resin or plastic.

[0025] Compared with the prior art, the utility model has at least one of the following beneficial effects:

[0026] 1. The utility model can cooperate with the online monitoring system by setting small adjustment areas of different lengths in the shielding area of ​​the shielding plate, and shorten the small adjustment area according to the copper deposition quality corresponding to the small adjustment area detected by the online monitoring system, so as to change the electrolyte flow to each small area of ​​the cathode roller, thereby effectively improving the consistency and uniformity of the unit quality of copper foil, reducing the production of waste foil, and greatly improving the yield rate of electrolytic copper foil.

[0027] 2. The utility model uses a retractable shielding area to achieve that the shielding plate can be used to prepare copper foils of different thicknesses on the same foil production machine, without the need to prepare a shielding plate for each specification of copper foil; and can also be used on multiple different foil production machines, without the need to prepare a new shielding plate for each foil production machine, thereby greatly improving the versatility of the anode shielding plate of the electrolytic copper foil and shortening the preparation and replacement time of the foil production machine accessories.

[0028] 3. The utility model only inserts the shielding plate between the electrolyte flow field of the cathode roller and the anode plate, which will neither damage the surface quality of the cathode roller nor cause the small gap breakdown of the anode plate, effectively ensuring the quality stability of different batches of electrolytic copper foil.

[0029] 4. The utility model does not need to change the electrolyte concentration in each small area. The concentration distribution of the electrolyte in each small area is the same, and there is no concentration gradient. Therefore, there is no mutual interference between the electrolyte flow basins in each small adjustment area. The operation is simple and mass production is easy to achieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0031] Figure 1 This is a schematic diagram of the structure of an anode tank shielding plate for electrolytic copper foil in one embodiment of the utility model;

[0032] Figure 2 This is an exploded schematic diagram of an anode tank including a shielding plate in one embodiment of the utility model;

[0033] Figure 3 It is a schematic structural diagram of an anode tank including a shielding plate in one embodiment of the utility model.

[0034] The corresponding reference numerals are: 1-shielding plate, 2-installation area, 3-shielding area, 4-anode tank, 5-cathode roller, 6-anode plate, 7-adjustment area, 8-rinsing area, 9-small adjustment area, 10-bolt. DETAILED DESCRIPTION

[0035] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the utility model. These all fall within the scope of protection of the utility model.

[0036] It should be noted that the terms "upper", "lower", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "upper" or "lower" may explicitly or implicitly include one or more of the features. Moreover, the terms "upper", "lower", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0037] Reference Figure 1 , which is a schematic structural diagram of an anode tank shielding plate for electrolytic copper foil in one embodiment of the utility model. Figure 2 and Figure 3 The schematic diagram of installing the shielding plate 1 on the anode tank 4 is shown. The shielding plate 1 includes an installation area 2 and a shielding area 3. One end of the installation area 2 is fixed to the side wall of the anode tank 4. The installation area 2 is arranged horizontally. The installation area 2 is used to fix the position of the shielding area 3 in the anode tank 4. The shielding area 3 is connected to the other end of the installation area 2. The shielding area 3 is located in the electrolyte between the cathode roller 5 and the anode plate 6. The shielding area 3 is parallel to the roller axis of the cathode roller 5. The shielding area 3 is divided into an adjustment area 7 and a rinsing area 8 along the width direction. The rinsing area 8 is close to the installation area 2. The adjustment area 7 is divided into a plurality of small adjustment areas 9 along the length direction. The widths of the plurality of small adjustment areas 9 along the direction parallel to the axis of the cathode roller 5 are the same. The length of the small adjustment area 9 along the direction perpendicular to the axis of the cathode roller 5 is shortened according to the copper deposition unit area mass corresponding to the small adjustment area 9 detected by the online monitoring system. The length and width of the rinsing area 8 are not shortened. The flow rate of each area of ​​the overflow port is adjusted by the small adjustment areas 9 of different lengths of the shielding plate 1. In the area where the small adjustment zone 9 is longer, the electrolyte flow rate is smaller and the amount of electro-deposited copper is smaller; on the contrary, in the area where the small adjustment zone 9 is shorter, the electrolyte flow rate is larger and the amount of electro-deposited copper is larger. In the place where the flow rate is large in the foil machine, a shielding plate 1 is used to shield part of the flow rate, so that the flow rates in each area tend to be consistent and the electro-deposition quality is consistent, thereby improving the consistency of the unit area quality of the copper foil; the shielding area 3 is a retractable shielding area, and the rinsing area 8 has a cavity structure. The rinsing area 8 is set outside the adjustment area 7. The adjustment area 7 can be retracted into the cavity structure of the rinsing area 8. The rinsing area 8 provides a certain adjustment space for each plate of the adjustment area 7 to retract. The cavity structure of the rinsing area 8 can be a whole large cavity or a plurality of small cavities. The adjustment area 7 and the rinsing area 8 are connected to form a retractable structure, so that the shielding plate can be adapted to multiple different foil machines, or copper foils of different thicknesses can be prepared on the same foil machine.

[0038] The embodiment of the utility model realizes that the shielding plate can be used to prepare copper foils of different thicknesses on the same foil machine through a retractable shielding area, without the need to prepare shielding plates for each specification of copper foil; and can also be used on multiple different foil machines, without the need to prepare new shielding plates for each foil machine, which greatly improves the versatility of the anode shielding plate of the electrolytic copper foil and shortens the preparation and replacement time of the foil machine accessories. By using the shielding plate, the uniformity and consistency of the unit area mass of the electrolytic copper foil can be improved online without changing the electrolyte concentration, the structure of the anode plate 6, and the surface of the cathode roller 5, reducing the generation of waste foil, thereby effectively improving the yield rate of copper foil, and having significant economic benefits.

[0039] The angle between the mounting area 2 and the shielding area 3 is different, and correspondingly the angle between the shielding plate and the liquid flow is different. The angle between the mounting area 2 and the shielding area 3 directly affects the shielding effect on the liquid flow. In some embodiments, the angle between the mounting area 2 and the shielding area 3 is 45° to 90°, which can be adapted to different foil production machines and prepare copper foils of different specifications on the same equipment.

[0040] In the embodiment of the utility model, the shortening process refers to taking the maximum value of the raw foil mass per unit area as the reference value, and reducing the length of the small adjustment area 9 according to the difference between the mass per unit area of ​​each small adjustment area 9 and the reference value. Copper foils of different thicknesses have different maximum values ​​of the raw foil mass per unit area, and the reference value can be obtained by combining the thickness detected in real time by the online monitoring system and the thickness of the final finished product. The reference length of the small adjustment area 9 before the shortening process is usually the median value of the retractable amount of the adjustment area, which is determined according to different types of foil machines.

[0041] In some embodiments, the reduction range of the small adjustment area 9 is: for every 1g / m 2 The difference, the length of the corresponding small adjustment area 9 is reduced by 10-30mm. The upper limit of the reduction is determined according to the actual fluctuation range of the copper foil thickness and the reference value. Preferably, the reduction range of the small adjustment area 9 is 100mm as the upper limit. If the reduction range exceeds 100mm, it is uniformly reduced by 100mm.

[0042] In some embodiments, when the length of each small adjustment area 9 is reduced, the lines between each small adjustment area 9 are transitioned as arc lines, thereby avoiding a sudden change in the mass per unit area, affecting the quality of the copper foil, and avoiding cutting the cathode roller 5.

[0043] In some embodiments, the 35 mm area on both sides of the length direction of the shielding area 3 is adjusted according to the line trend of the adjacent area. It should be noted that since the edge of the copper foil is more strongly bonded to the cathode roller than the middle area and is not easy to peel off, the length of the area to be adjusted can be fine-tuned according to the actual peeling situation of the copper foil.

[0044] If the number of small adjustment areas 9 is too small, the micro-area adjustment function cannot be achieved; the more small adjustment areas 9 there are, the finer the adjustment area is. In some embodiments, the adjustment area 7 is divided into 5 to 50 small adjustment areas 9 along the length direction, thereby effectively adjusting the flow rate of each area of ​​the overflow port.

[0045] The mounting area 2 is fixed to the tank wall of the anode tank 4 by a fixing structure. Figure 1 As shown, the mounting area 2 is mounted on the side wall of the anode tank 4 by bolts 10. In other embodiments, the mounting area 2 may also be fixed to the side wall of the anode tank 4 by other forms of fixing structures such as hooks or clamping structures.

[0046] In some embodiments, the material of the installation area 2 and the shielding area 3 is resin or plastic. In other embodiments, any other material that does not chemically react with the electrolyte and is non-conductive in the electrolyte can also be used, so as to reduce the electrolyte inlet to the cathode roller 5 without affecting the conductivity of the positive and negative electrodes during the electrolysis process.

[0047] In the above-mentioned embodiment of the utility model, small adjustment areas 9 of different lengths are set in the shielding area 3 of the shielding plate 1, which can be coordinated with the online monitoring system. The small adjustment area 9 is shortened according to the copper deposition quality corresponding to the small adjustment area 9 detected by the online monitoring system, so as to change the electrolyte flow rate flowing to each small area of ​​the cathode roller 5, effectively improve the consistency and uniformity of the unit generated quality of the copper foil, reduce the production of waste foil, and thus greatly improve the yield rate of the electrolytic copper foil. By using the anode tank 4 with the shielding plate 1 in the embodiment of the utility model, the unit area mass accuracy of the electrolytic copper foil obtained is 30% higher than that of the electrolytic copper foil product obtained by using the anode tank without the shielding plate installed, and the copper foil yield rate is increased by 25%, saving production costs.

[0048] The above-mentioned embodiment of the utility model realizes that the shielding plate can be used to prepare copper foils of different thicknesses on the same foil production machine through the retractable shielding area, without the need to prepare a shielding plate for each specification of copper foil separately; and can also be used on multiple different foil production machines, without the need to prepare a new shielding plate for each foil production machine separately, which greatly improves the versatility of the anode shielding plate of the electrolytic copper foil and shortens the preparation and replacement time of the foil production machine accessories.

[0049] The embodiment of the utility model only inserts the shielding plate 1 between the electrolyte flow area of ​​the cathode roller 5 and the anode plate 6, which neither damages the surface quality of the cathode roller 5 nor causes the small gap breakdown of the anode plate 6, effectively ensuring the quality stability of different batches of electrolytic copper foil.

[0050] The embodiment of the utility model does not need to change the electrolyte concentration in each small area, and the concentration distribution of the electrolyte in each small area is the same, and there is no concentration gradient. Therefore, there is no mutual interference between the electrolyte flow basins in each small adjustment area 9. The operation is simple, batch production is easy to achieve, and there are significant economic benefits.

[0051] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various modifications or variations within the scope of the claims, which does not affect the essence of the present invention.

Claims

1. An anode tank shielding plate for electrolytic copper foil, characterized in that: include: An installation area, one end of which is fixed to the side wall of the anode tank, and the installation area is arranged horizontally; A shielding area connected to the other end of the mounting area; the shielding area is located between the cathode roller and the anode plate, and the shielding area is parallel to the roller axis of the cathode roller; The shielding area is divided into an adjustment area and a rinsing area along the width direction, the rinsing area is close to the installation area, and the adjustment area is divided into multiple small adjustment areas along the length direction, and the widths of multiple small adjustment areas are the same; the length of the small adjustment area is shortened according to the copper deposition unit area mass corresponding to the small adjustment area detected by the online monitoring system; the rinsing area has a cavity structure, the rinsing area is sleeved on the outside of the adjustment area, the adjustment area can be extended into the cavity structure of the rinsing area, and the rinsing area provides adjustment space for the adjustment area when it is extended and retracted.

2. The anode tank shielding plate for electrolytic copper foil according to claim 1, characterized in that: The installation area and the shielding area form an angle of 45° to 90°.

3. The anode tank shielding plate for electrolytic copper foil according to claim 1, characterized in that: The shortening process refers to taking the maximum value of the raw foil mass per unit area as a reference value, and reducing the length of each small adjustment area according to the difference between the mass per unit area of ​​each small adjustment area and the reference value.

4. The anode tank shielding plate for electrolytic copper foil according to claim 3, characterized in that: The reduction range of the small adjustment area is: for every 1g / m 2 The difference corresponds to a reduction of 10 to 30 mm in length of the small adjustment zone.

5. The anode tank shielding plate for electrolytic copper foil according to claim 4, characterized in that: The reduction range of the small adjustment area is limited to 100 mm.

6. The anode tank shielding plate for electrolytic copper foil according to claim 3, characterized in that: When the length of each small adjustment area is shortened, the lines between each small adjustment area are transitioned with curved lines.

7. The anode tank shielding plate for electrolytic copper foil according to claim 6, characterized in that: The 35mm areas on both sides of the length direction of the shielding area are adjusted according to the line trend of the adjacent areas.

8. The anode tank shielding plate for electrolytic copper foil according to claim 1, characterized in that: The adjustment area is divided into 5 to 50 small adjustment areas along the length direction.

9. The anode tank shielding plate for electrolytic copper foil according to claim 1, characterized in that: The installation area is fixed to the side wall of the anode tank by any one of bolts, hooks and clamping structures.

10. The anode tank shielding plate for electrolytic copper foil according to claim 1, characterized in that: The installation area and the shielding area are made of resin or plastic.

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