CN113106503A

CN113106503A - Electrolytic cell, metal foil forming device provided with same, and method for assembling electrolytic cell

Info

Publication number: CN113106503A
Application number: CN202110502150.2A
Authority: CN
Inventors: 金准燮; 吕成根; 朴昶国
Original assignee: Human Science Machinery Co ltd
Current assignee: Human Science Machinery Co ltd
Priority date: 2020-05-25
Filing date: 2021-05-08
Publication date: 2021-07-13
Also published as: KR102358681B1; KR20210145544A

Abstract

The invention discloses an electrolytic cell capable of rotatably supporting a cylindrical roller for forming a metal foil on the outer peripheral surface by electrolysis of an electrolyte, an assembling method of the electrolytic cell, and a metal foil forming device with the electrolytic cell. The disclosed electrolytic cell is provided with: a frame having an inner curved wall curved so as to be spaced apart from the outer circumferential surface of the drum roller; an anode base fixedly supported on an inner surface of the inner curved wall facing the outer circumferential surface of the drum roller and curved so as to surround the outer circumferential surface of the drum roller; an electrode plate fixedly coupled to an inner side surface of the anode base facing an outer circumferential surface of the drum roller so as to form a gap with the outer circumferential surface of the drum roller; a plurality of current-carrying buses provided on the inner curved wall so as to be spaced apart from each other and to be in electrical contact with the anode base; and an electrolyte supply nozzle that supplies electrolyte to the gap. The inner side of the inner curved wall and the outer side of the anode base are welded and joined face to face.

Description

Electrolytic cell, metal foil forming device provided with same, and method for assembling electrolytic cell

Technical Field

The present invention relates to an electrolytic cell used for forming a metal by an electrolytic method, a metal foil forming apparatus provided with the electrolytic cell, and a method of assembling the electrolytic cell.

Background

For example, a metal foil having a thickness of several μm to several tens μm is used in many electrical and chemical products such as secondary batteries, and the metal foil may be manufactured by an electrolytic method. Fig. 1 is a cross-sectional view of a conventional metal foil forming apparatus for forming a metal foil by an electrolytic method. Referring to fig. 1, a conventional example of a metal foil forming apparatus 1 includes a drum roller 2 (cathode) as a cathode (cathode), and an electrolytic bath 5 rotatably supporting the drum roller 2.

The electrolytic cell 5 includes a frame 6(frame), a pair of anode bases 18(anode base), a plurality of support beams 15(beam), a pair of current supply buses 21(bus), and an electrolyte supply nozzle 25 (nozzle). The frame 6 includes: a front wall and a back wall (not shown) for rotatably supporting a rotating shaft (not shown) of the drum roller 2, a left side wall 7 and a right side wall 8 erected on the left side and the right side of the drum roller 2, and a left inner curved wall 11 and a right inner curved wall 12 disposed to be spaced apart from a lower portion of the outer peripheral surface of the drum roller 2.

The pair of

anode substrates

18, 19 are formed to be curved in a manner spaced apart from the lower portion of the outer peripheral surface of the drum roller 2, and are divided into a left anode substrate 18 relatively closer to the left side wall 7 and a right anode substrate 19 relatively closer to the right side wall 8. Although not shown in fig. 1, a plurality of electrode plates (electrode plates) are attached to the inner side surfaces of a pair of

anode substrates

18, 19 facing the outer peripheral surface of the roll 2. A spaced gap 20 is formed between the plurality of electrode plates and the outer circumferential surface of the drum roller 2.

The support beams 15 are members for supporting the pair of

anode bases

18 and 19 with a space between the right inner curved wall 11 and the left inner curved wall 12, and have a substantially I-shaped cross section and extend parallel to the Y-axis. The support beams 15 are arranged at equal angular intervals with respect to the rotation center of the drum roller 2. A pair of energizing buses 21, 22(bus) for supplying electric current to the pair of anode bases 18 and the plurality of electrode plates attached to the pair of anode bases 18, one (21) of the pair of energizing buses 21, 22 is electrically connectable to a left end of the left anode base 18, and the remaining one (22) is electrically connectable to a right end of the right anode base 19. The electrolyte supply nozzle 25 supplies the electrolyte to the gap 20, and the electrolyte supply nozzle 25 is disposed between the left anode base 18 and the right anode base 19 and extends parallel to the Y axis.

In the conventional electrolytic cell 5, since the pair of

anode bases

18 and 19 are supported by the plurality of spaced support beams 15, there is a possibility that a large error occurs in the distance between the inner surfaces of the pair of

anode bases

18 and 19 and the outer peripheral surface of the drum 2 depending on the skill of the operator. After the pair of

anode bases

18 and 19 are provided on the frame 6, the inner surfaces of the pair of

anode bases

18 and 19 cannot be precisely machined so as to be spaced apart by a predetermined distance on the outer peripheral surface of the platen roller 2. Accordingly, the tolerance of the inner side surfaces of the pair of

anode substrates

18, 19 is +/-1.5mm, and the error of the gap 20 between the outer circumferential surface of the roll drum 2 and the plurality of electrode plates (not shown) is increased.

Further, since the left and right energizing buses 21, 22 are connected only to the left end of the left anode base 18 and the right end of the right anode base 19, the distribution of the magnitude of the current in the entire area of the pair of

anode bases

18, 19 is not constant. For this reason, the thickness of the metal foil formed by the metal foil forming apparatus 1 may be uneven, resulting in a decrease in the quality of the metal foil and also a decrease in the productivity of the metal foil.

The inner surfaces of the front and rear walls (not shown) of the frame 6 and the upper surfaces of the left and right inner

curved walls

11 and 12 are coated with a rubber (rubber) material to prevent the frame 6 from being corroded by exposure to an electrolyte. However, there is a problem in that a large amount of environmental pollutants are discharged due to such a rubber coating work, and as the rubber material is continuously exposed to the electrolytic solution and hardened, the frame 6 is corroded, and thus there is a problem in that the endurance life of the frame 6 is shortened.

Documents of the prior art

Patent document

Korean granted patent publication No. 10-0762050.

Disclosure of Invention

Technical problem

The invention provides a metal foil forming device which is improved to improve the quality and the productivity of metal foil, an electrolytic cell provided with the metal foil forming device and an assembling method of the electrolytic cell.

Technical scheme

The present invention provides an electrolytic cell capable of rotatably supporting a cylindrical drum roller (drum roller) having a metal foil formed on an outer circumferential surface thereof by electrolysis of an electrolytic solution, the electrolytic cell including: a frame (frame) having an inner curved wall curved so as to be spaced apart from the outer circumferential surface of the drum roller, and an anode base (anode base) fixedly supported on an inner surface of the inner curved wall facing the outer circumferential surface of the drum roller and curved so as to surround the outer circumferential surface of the drum roller; an electrode plate fixedly coupled to an inner surface of the anode base facing an outer circumferential surface of the drum roll so as to form a gap with the outer circumferential surface of the drum roll; a plurality of current-carrying buses (bus) provided to the inner curved wall so as to be spaced apart from each other in electrical contact with the anode substrate; and an electrolyte supply nozzle (nozzle) for supplying an electrolyte to the gap, wherein an inner surface of the inner curved wall and an outer surface of the anode base are welded and joined to each other in a face-to-face manner.

The frame may be made of a titanium (Ti) material.

The plurality of current-carrying bus bars may be fixedly mounted in a bus bar mounting groove (groove) formed to penetrate the inner curved wall in a thickness direction thereof, inner side surfaces of the current-carrying bus bars may be conductively contacted with an outer side surface of the anode base, and outer side surfaces of the current-carrying bus bars may be conductively contact-coupled to terminals for supplying current to the current-carrying bus bars.

The plurality of power buses may be made of copper (Cu) or copper alloy material.

The anode substrate may be provided with: a curved section extending along an arc centered on the rotation axis of the drum roller; and a linear section extending from both ends of the curved section in a tangential direction of the arc.

The present invention also provides a cylindrical drum roll (drum roll) for forming a metal foil on an outer circumferential surface by electrolysis of an electrolytic solution, and a metal foil forming apparatus including the electrolytic cell.

In addition, the present invention provides an electrolytic cell assembly method comprising: a power bus installation step of installing the plurality of power buses on the inner curved wall; an anode base welding step of welding and joining an outer side surface of the anode base to an inner side surface of the inner curved wall in a face-to-face manner; an electrode plate coupling step of fixedly coupling an electrode plate to an inner side surface of the anode base; and an anode base surface processing step of machining the inside surface of the anode base in such a manner that a gap between the inside surface of the anode base and the electrode plate is minimized after the anode base welding step and before the electrode plate bonding step.

The anode substrate surface processing step may include: and a step of milling the inner side surface of the anode substrate, or a step of grinding the inner side surface of the anode substrate.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the anode base of the electrolytic cell is joined face-to-face to the frame by welding, even if the surface of the anode base is machined, the anode base does not shake or vibrate, so that the surface can be precisely machined. Therefore, by precisely machining the inner side surface of the anode base to which the electrode plate is fixedly coupled to minimize a gap between the inner side surface of the anode base and the electrode plate, an error in a gap between the outer circumferential surface of the drum roller and the electrode plate can be minimized.

In addition, since the plurality of energization buses are in contact with the outer side surface of the anode substrate at uniform intervals, the distribution of the magnitude of the current in the entire area of the anode substrate is constant. Therefore, the thickness error of the metal foil formed on the outer circumferential surface of the drum roller by electrolysis of the electrolytic solution is reduced, thereby improving the quality of the metal foil and also improving the productivity of the metal foil.

According to the preferred embodiment of the present invention, since the frame is made of a titanium (Ti) material, it is not corroded by the electrolyte, thereby improving the endurance life of the electrolytic bath including the frame, and since the work of coating the frame with a rubber material is not performed, the environmental pollutants are not discharged during the fabrication of the electrolytic bath.

Drawings

Fig. 1 is a cross-sectional view of a conventional metal foil forming apparatus for forming a metal foil by an electrolytic method.

Fig. 2 is a sectional view of a metal foil forming apparatus of an embodiment of the present invention.

Fig. 3 is an enlarged view showing a portion III of fig. 2.

Fig. 4 is an enlarged view showing a portion IV of fig. 2.

Drawings

30: metal foil forming apparatus, 31: drum roller, 35: electrolytic cell, 36: frame, 46, 51: anode substrate, 55: electrode plate, 60: power-on bus, 70: an electrolyte supply nozzle.

Detailed Description

An electrolytic cell, a metal foil forming apparatus provided with the electrolytic cell, and a method of assembling the electrolytic cell according to embodiments of the present invention will be described in detail below with reference to the drawings. The term (terminologies) used in the present specification is a term used to appropriately express preferred implementations of the present invention, which may be different according to the intention of a user or an operator or a convention in the art to which the present invention pertains. Therefore, the definitions of these terms should be defined based on the contents of the specification as a whole.

Fig. 2 is a cross-sectional view of a metal foil forming apparatus according to an embodiment of the present invention, fig. 3 is an enlarged view of a portion III of fig. 2, and fig. 4 is an enlarged view of a portion IV of fig. 2. Referring to fig. 2 to 4 together, a metal foil forming apparatus 30 according to an embodiment of the present invention includes a cylindrical drum roller (drum roller) 31 and an electrolytic bath 35 that rotatably supports the drum roller 31. The drum roller 31 includes a rotation shaft 33 extending through the center thereof in parallel with the Y axis, and is rotatable about a virtual rotation axis RX extending in parallel with the Y axis along the rotation shaft 33.

The electrolytic cell 35 includes a frame 36(frame), left and

right anode bases

46 and 51, a plurality of electrode plates 55, a plurality of current supply buses 63(bus), an electrolyte supply nozzle 70(nozzle), and left and right electrolyte collection tanks 75. The frame 36 includes: a front wall 37 rotatably supporting a portion protruding forward of the rotary shaft 33; a back surface wall 38 that rotatably supports a portion protruding rearward of the rotation shaft 33; and a left inner curved wall 40 and a right inner curved wall 43 which are disposed to be spaced apart from a lower portion of the outer circumferential surface of the drum roller 31. The front and rear ends of the left inner curved wall 40 and the right inner curved wall 43 are fixedly supported to the front wall 37 and the rear wall 38 by welding, for example.

The left inner curved wall 40 and the right inner curved wall 43 extend along an arc centered on the rotation axis RX, and are bilaterally symmetric about a virtual vertical plane VL including the rotation axis RX. The right end of the left inside curved wall 40 and the left end of the right inside curved wall 43 are spaced apart from each other across the vertical plane VL. The left end of the left inner curved wall 40 and the right end of the right inner curved wall 43 extend upward above an imaginary horizontal plane PL including the rotation axis RX. The vertical plane VL is parallel to the YZ-plane and the horizontal plane PL is parallel to the XY-plane. The frame 36 is formed of a titanium (Ti) material that is not corroded by an electrolyte such as an aqueous sulfuric acid solution, an aqueous hydrochloric acid solution, or the like.

The left anode base 46 and the right anode base 51 are fixedly supported by the left and right inner curved walls 43, respectively, and are formed to curve around the outer peripheral surface of the drum roller 31. Specifically, the

inner surfaces

41 and 44 of the left and right inner

curved walls

40 and 43 facing the outer peripheral surface of the drum roller 31 and the

outer surfaces

47 and 52 of the left and right anode bases 46 and 51 are welded to face each other. Like the frame 36, the left and

right anode substrates

46 and 51 are formed of a titanium (Ti) material that is not corroded by the electrolyte.

Like the left inner curved wall 40 and the right inner curved wall 43, the left anode base 46 and the right anode base 51 are bilaterally symmetrical about a virtual vertical plane VL including the rotation axis RX. The right end 46a of the left anode substrate 46 and the left end 51a of the right anode substrate 51 are spaced apart by the vertical plane VL. The left end 46b of the left anode substrate 46 and the right end 51b of the right anode substrate 52 extend upward above an imaginary horizontal plane PL including the rotation axis RX.

The left anode base 46 and the right anode base 51 have straight sections SI and SU relatively close to the

ends

46a, 46b, 51a, and 51b, and curved sections between the straight sections SI and SU on both sides. The curved section is a section extending along an arc centered on the rotation axis RX of the drum roller 31. The straight line intervals SI and SU extend along the tangential direction of the circular arc at the tail ends of the two sides of the curve interval. Therefore, in the curved section, the distance between the outer peripheral surface of the platen roller 31 and the inner side surfaces 48 and 53 of the left and right anode bases 46 and 51 is designed to be constantly spaced, and in the straight sections SI and SU, the distance between the outer peripheral surface of the platen roller 31 and the inner side surfaces 48 and 53 of the left and right anode bases 46 and 51 is designed to be spaced farther from the curved section.

A plurality of electrode plates 55 are fixedly coupled to the left anode base 46 and the right anode base 51. Specifically, the plurality of electrode plates 55 are fastened to the left anode base 46 and the right anode base 51 by a plurality of bolts (not shown) so that outer surfaces of the plurality of electrode plates 55 face the

inner surfaces

48 and 53 of the left anode base 46 and the right anode base 51. Each of the plurality of electrode plates 55 is a rectangular-shaped member having a constant thickness, and is bent corresponding to the curvature of the inner side surfaces 48, 53 of the left and right anode bases 46, 51 as the plurality of bolts are tightened when fastened to the left and right anode bases 46, 51 by the plurality of bolts. Edges of a pair of opposing electrode plates 55 among the plurality of electrode plates 55 may contact each other.

A gap is formed between the outer circumferential surface of the drum roller 31 and the inner surfaces of the plurality of electrode plates 55 facing the outer circumferential surface of the drum roller 31. An electrolyte is filled in the gap. The design value of the size of the gap is obtained by subtracting the design value of the thickness of the electrode plate 55 from the design value of the distance between the outer peripheral surface of the drum roller 31 and the inner surfaces of the left anode base 46 and the right anode base 51. Therefore, in the straight sections SI, SU of the left and

right anode substrates

46, 51, the values GI1, GU1 at the boundaries of the straight sections SI, SU and the curved sections are smallest in terms of the design value of the gap between the outer circumferential surface of the drum roller 31 and the inner side surfaces of the plurality of electrode plates 55, and the values GI2, GU2 at the ends of the straight sections SI, SU are largest as they become larger toward the ends of the straight sections SI, SU. In the curved sections of the left and

right anode substrates

46 and 51, the design value of the gap between the outer circumferential surface of the drum roller 31 and the inner side surfaces of the plurality of electrode plates 55 is equal to the values GI1, GU1 at the boundaries of the curved sections.

Since the left anode base 46 and the right anode base 51 can be firmly joined and supported to the left inner curved wall 40 and the right inner curved wall 43 by welding, the

inner surfaces

48 and 53 of the left anode base 46 and the right anode base 51 are precisely machined before the plurality of electrode plates 55 are fixedly joined to the left anode base 46 and the right anode base 51. The precision machining may be milling (milling) or grinding (grinding), for example.

Due to the precision machining, the allowable tolerance of the inside faces 48, 53 of the left 46 and right 51 anode substrates is reduced to +/-0.2 mm. As a result, the gap between the

inner surfaces

48 and 53 of the left and right anode bases 46 and 51 and the lower surfaces of the plurality of electrode plates 55 facing the

inner surfaces

48 and 51 is minimized, and the errors between the design values and the actual values of the gaps GI1, GI2, GU1, and GU2 between the outer peripheral surface of the drum roller 31 and the inner surfaces of the plurality of electrode plates 55 are also extremely smaller than before. From the results, the thickness error of the metal foil electrolytically deposited on the outer circumferential surface of the drum roller 31 due to the electrolysis of the electrolytic solution is reduced, thereby improving the quality of the metal foil, and also improving the productivity of the metal foil.

Minimizing the gap between the

inner surfaces

48, 53 of the left and right anode bases 46, 51 and the lower surfaces of the plurality of electrode plates 55 facing the

inner surfaces

48, 51 as described above means that the

inner surfaces

48, 53 of the left and right anode bases 46, 51 and the lower surfaces of the plurality of electrode plates 55 are maximally adhered to each other. Therefore, compared to the conventional electrolytic cell 5 (see fig. 1), the electrolytic solution that has penetrated between the

inner surfaces

48 and 53 of the left and right anode bases 46 and 51 and the lower surfaces of the plurality of electrode plates 55 is reduced, and therefore the durability of the plurality of electrode plates 55 is also improved compared to the conventional electrolytic cell.

A plurality of current-carrying buses 60(bus) are provided on left inner curved wall 40 and right inner curved wall 43 so as to be in electrical contact with left anode base 46 and right anode base 51. The plurality of current-carrying bus bars 60 are fixed and mounted to a plurality of bus bar mounting grooves 40g (grooves) formed to penetrate the left inner curved wall 40 and the right inner curved wall 43 in the thickness direction thereof by a method such as welding. Each energizing bus 60 extends in a direction parallel to the axis of rotation RX.

Left anode base 46 and right anode base 51 are welded face to be joined to left inner curved wall 40 and right inner curved wall 43 so that the inner surface of each current-carrying bus 60 can be electrically contacted to

outer surfaces

47 and 52 of left anode base 46 and right anode base 51. Each of the energizing buses 60 is tightly coupled with a terminal 63 coupled to a tip end of an electric wire 65 for supplying electric current by a bolt (not shown). Therefore, the outer side surface of the energizing bus 60 can be electrically contacted to the terminal 63.

In the preferred embodiment, the plurality of power bus lines 60 are arranged at equal angular intervals or at equal intervals around the rotation axis RX. In this way, the plurality of current-carrying buses 60 are in contact with the outer side surfaces 47, 52 of the left and

right anode substrates

46, 51 at uniform intervals, so that the distribution of the magnitude of the current in the entire areas of the left and

right anode substrates

46, 51 is constant with little error. From the results, the thickness error of the metal foil electrolytically deposited on the outer circumferential surface of the drum roller 31 due to the electrolysis of the electrolytic solution is reduced, thereby improving the quality of the metal foil, and also improving the productivity of the metal foil.

The plurality of power buses 60 are formed of a copper (Cu) or copper alloy material that is less expensive than titanium (Ti). Nevertheless, the plurality of energizing buses 60 are in contact with the outer side surfaces of the left and

right anode substrates

46 and 51 without being exposed to the electrolyte, and thus are not corroded by the electrolyte, and can be used semi-permanently. That is, the durability of the plurality of current-carrying bus lines 60 is improved as compared with the current-carrying bus lines 21 and 22 (see fig. 1) provided in the conventional electrolytic cell 5 (see fig. 1).

The electrolyte supply nozzle 70 supplies the electrolyte to the gaps GI1, GI2, GU1, GU2 between the outer peripheral surface of the roll roller 31 and the plurality of electrode plates 55, and the electrolyte supply nozzle 70 is disposed between the right end 46a of the left anode base 46 and the left end 51a of the right anode base 51 and extends parallel to the rotation axis RX. An electrolyte discharge hole 71 is formed in a side surface of the electrolyte supply nozzle 70, and the electrolyte discharge hole 71 discharges the electrolyte obliquely upward to a gap GI2 between the right end 46a of the left anode base 46 and the outer circumferential surface of the drum roller 31 and a gap GI2 between the left end 51a of the right anode base 51 and the outer circumferential surface of the drum roller 31.

As described above, the linear section SI is formed close to the lower ends 46a, 51a of the left and right anode bases 46 and 51, so that the loss of the electrolyte is minimized when the electrolyte discharged from the electrolyte supply nozzle 70 is injected into the gap, and a large amount of the electrolyte is injected into the gap. Further, since the straight sections SU are formed close to the upper ends 46b and 51b of the left and right anode bases 46 and 51, the electrolyte is smoothly discharged through the upper ends 46b and 51b of the left and right anode bases 46 and 51 without flowing backward in the gap in spite of gravity.

The electrolyte discharged through the upper ends 46b, 51b of the left and right anode bases 46, 51 is collected in left and right electrolyte collection tanks 75, and is discharged through a drain port 76. The electrolyte discharged from the left and right electrolyte collection tanks 75 through the drain port 76 may be re-supplied to the electrolyte supply nozzle 70 for recirculation (recycling).

When a cathode (cathode) of a power supply device (not shown) is electrically connected to the drum roller 31, an anode (anode) of the power supply device is electrically connected to the electric wire 65, and an electrolyte is injected into the gap through the electrolyte supply nozzle 70, the electrolyte injected into the gap is electrolyzed, thereby electrolytically depositing and forming a metal foil on the outer circumferential surface of the drum roller 31.

The electrolytic cell 35 is made of a titanium (Ti) material having a frame 36 that is not corroded by the electrolyte, and a plurality of electrode plates 55 are attached to the left anode base 46 and the right anode base 51. The plurality of current supply buses 60 are disposed without being exposed to the electrolyte. With such a configuration, corrosion by the electrolytic solution is minimized, thereby improving the durability of the electrolytic cell 35. In addition, unlike the conventional electrolytic bath 5 (see fig. 1), since the work of coating the frame 36 with the rubber material is not performed, the environmental pollutants are not discharged during the manufacturing process of the electrolytic bath 35.

The method of assembling the electrolytic bath 35 will be described below. The method of assembling the electrolytic cell 35 includes: a power-on bus setting step (S10), an anode base welding step (S20), an anode base surface processing step (S30), and an electrode plate bonding step (S40). The current-carrying bus installation step (S10) is a step of installing a plurality of current-carrying buses 60 on the left inner curved wall 46 and the right inner curved wall 51, and since the description of the plurality of current-carrying buses 60 has already been described, a repeated description will be omitted.

The anode base welding step (S20) is a step of welding and joining the

outer surfaces

47 and 52 of the left and right anode bases 46 and 51 to the

inner surfaces

41 and 44 of the left and right inner

curved walls

40 and 43 so as to face each other. As for the anode base welding step (S20), since it has already been described in the case of the side anode base 46 and the right anode base 51, a repeated description will be omitted. The electrode plate joining step (S40) is a step of fixedly joining the plurality of electrode plates 55 to the

inner surfaces

48 and 53 of the left anode base 46 and the right anode base 51. As for the electrode plate joining step (S40), since it has been already mentioned in describing the plurality of electrode plates 55, a repeated explanation will be omitted.

The anode base surface processing step (S30) is a step of precisely machining the inside surfaces 48, 53 of the left and right anode bases 46, 51 after the anode base welding step (S20) and before the electrode plate bonding step (S40). The anode substrate surface processing step (S30) may include: a step of milling (grinding) the

inner surfaces

48, 53 of the left and right anode bases 46, 51, or a step of grinding (grinding) the

inner surfaces

48, 53 of the left and right anode bases 46, 51.

Due to the precision machining, the allowable tolerance of the inside faces 48, 53 of the left 46 and right 51 anode substrates is reduced to +/-0.2 mm. As a result, the gaps between the lower surfaces of the plurality of electrode plates 55 joined in the electrode plate joining step S40 and the

inner surfaces

48 and 53 of the left anode base 46 and the right anode base 51 are minimized, and the errors between the design values and the actual values of the gaps GI1, GI2, GU1, and GU2 between the outer peripheral surface of the drum roller 31 and the inner surfaces of the plurality of electrode plates 55 are also extremely small in the conventional electrolytic cell 5 (see fig. 1). Therefore, the thickness error of the metal foil electrolytically deposited on the outer circumferential surface of the drum roller 31 due to the electrolysis of the electrolytic solution is reduced, thereby improving the quality of the metal foil, and also improving the productivity of the metal foil. Further, by fitting the gaps between the

inner surfaces

48 and 53 of the left and right anode bases 46 and 51 and the lower surfaces of the plurality of electrode plates 55 to the maximum extent, the amount of electrolyte that penetrates between the

inner surfaces

48 and 53 of the left and right anode bases 46 and 51 and the lower surfaces of the plurality of electrode plates 55 is reduced as compared with the conventional electrolytic cell 5 (see fig. 1), and the durability of the plurality of electrode plates 55 is improved as compared with the conventional electrolytic cell.

While the invention has been described with reference to the embodiments shown in the drawings, which are intended to be illustrative only, various modifications and equivalent other embodiments will be apparent to those of ordinary skill in the art from the teachings herein. Accordingly, the true scope of the invention should be limited only by the attached claims.

Claims

1. An electrolytic cell which rotatably supports a cylindrical roll having an outer peripheral surface on which a metal foil is formed by electrolysis of an electrolytic solution, the electrolytic cell comprising:

a frame having an inner curved wall curved so as to be spaced apart from an outer circumferential surface of the drum roller;

an anode base fixedly supported on an inner surface of the inner curved wall facing the outer circumferential surface of the drum roller and curved so as to surround the outer circumferential surface of the drum roller;

an electrode plate fixedly coupled to an inner surface of the anode base facing an outer circumferential surface of the drum roll so as to form a gap with the outer circumferential surface of the drum roll;

a plurality of current-carrying buses provided on the inner curved wall so as to be spaced apart from each other and to be in electrical contact with the anode base; and

an electrolyte supply nozzle that supplies electrolyte to the gap,

the inner side surface of the inner curved wall and the outer side surface of the anode substrate are welded and joined face to face.

2. The electrolytic cell of claim 1,

the frame is made of a titanium material.

3. The electrolytic cell of claim 1,

the plurality of electrified buses are fixedly mounted in bus mounting grooves formed to penetrate the inner curved wall in the thickness direction thereof,

the inner side surface of the current-carrying bus bar is in electrical contact with the outer side surface of the anode base, and the outer side surface of the current-carrying bus bar is in electrical contact with and joined to a terminal for supplying current to the current-carrying bus bar.

4. The electrolytic cell of claim 3,

the plurality of power buses are made of copper or copper alloy material.

5. The electrolytic cell of claim 1,

the anode substrate is provided with:

a curved section extending along an arc centered on the rotation axis of the drum roller; and

and a linear section extending from both ends of the curved section in a tangential direction of the arc.

6. A metal foil forming apparatus is characterized by comprising:

a cylindrical drum roller for forming a metal foil on an outer circumferential surface by electrolysis of an electrolytic solution; and

the electrolytic cell of any one of claims 1 to 5.

7. An electrolytic cell assembly method for assembling the electrolytic cell of any one of claims 1 to 5, the electrolytic cell assembly method comprising:

a power bus installation step of installing the plurality of power buses on the inner curved wall;

an anode base welding step of welding and joining an outer side surface of the anode base to an inner side surface of the inner curved wall in a face-to-face manner;

an electrode plate coupling step of fixedly coupling an electrode plate to an inner side surface of the anode base; and

an anode substrate surface processing step of machining the inside surface of the anode substrate in such a manner that a gap between the inside surface of the anode substrate and the electrode plate is minimized after the anode substrate welding step and before the electrode plate bonding step.

8. The electrolytic cell assembly method of claim 7,

the anode substrate surface processing step comprises: and a step of milling the inner side surface of the anode substrate, or a step of grinding the inner side surface of the anode substrate.