High-conductivity large-size cathode roller for electrolytic copper foil

Abstract

The high-conductivity large-size cathode roller for the electrolytic copper foil comprises a cylindrical titanium ring located on the outermost side, a copper ring and a steel ring are sequentially arranged in the direction from the inner wall of the titanium ring to the axis of the cathode roller, and side copper plates and side steel plates are sequentially and fixedly connected to the two sides of the copper ring from outside to inside. A steel shaft is arranged in the axial direction of the cathode roller, the two ends of the steel shaft sequentially penetrate through the side steel plates and the side copper plates and then stretch out, and a plurality of conductive copper cores are evenly installed on the inner wall of the titanium ring in the circumferential direction. The grooves are evenly formed in the inner wall of the titanium ring in the circumferential direction, the conductive copper cores are embedded in the grooves of the titanium ring, the conductive copper cores and the titanium ring form a whole, the defect that the conductivity of the titanium ring is poor is overcome, and the conductivity of the large-size cathode roller is greatly improved by improving the conductivity of the titanium layer on the surface of the cathode roller.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic copper foil, and in particular to a high-conductivity large-size cathode roller for electrolytic copper foil. Background Art

[0002] With the rapid development of new energy vehicles, the market demand for electrolytic copper foil for negative electrode current collector materials of lithium-ion batteries is increasing. As the key core equipment for the production of electrolytic copper foil, the performance of the cathode roller directly determines the quality of the electrolytic copper foil. Therefore, various electrolytic copper foil manufacturers at home and abroad are looking for cathode rollers with better performance. Among the many properties of the cathode roller, conductivity is the core indicator that electrolytic copper foil companies are most concerned about. Good conductivity can greatly reduce the production energy consumption of copper foil companies, thereby reducing production costs. Although the diameter of the cathode roller on the market has gradually developed from the initial 2m to 3.6m, which has greatly improved the production efficiency of electrolytic copper foil, how to continuously improve its conductivity while the diameter of the cathode roller continues to increase has become a difficult problem that needs to be solved in the industry.

[0003] The published patent application is: 202210164279.1, and its name is: A high-conductivity cathode roller for producing copper plates. Although the conductivity of the cathode roller is improved by adding a conductive copper plate inside the cathode roller, its main purpose is to make the current distribution on the surface of the cathode roller more uniform, and it cannot improve the conductivity of the titanium layer on the surface of the cathode roller itself.

[0004] In view of this, this invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and to improve the conductivity of the cathode roller by improving the conductivity of the titanium layer on the surface of the cathode roller.

[0006] The present invention provides a high-conductivity large-size cathode roller for electrolytic copper foil, comprising: a cylindrical titanium ring located at the outermost side, a copper ring and a steel ring are sequentially arranged along the inner wall of the titanium ring to the axial direction of the cathode roller, side copper plates and side steel plates are sequentially fixedly connected on both sides of the copper ring from the outside to the inside, a steel shaft is arranged along the axial direction of the cathode roller, both ends of the steel shaft pass through the side steel plates and the side copper plates in sequence and then extend out, and a plurality of conductive copper cores are evenly installed on the inner wall of the titanium ring along the circumferential direction.

[0007] Furthermore, a plurality of grooves are evenly formed on the inner wall of the titanium ring along the circumferential direction, and a conductive copper core is installed in the grooves.

[0008] Furthermore, the conductive copper core is in a strip or rod shape and is interference fitted with the groove.

[0009] Furthermore, after the copper ring and the titanium ring are interference fitted, the outer wall surface of the copper ring is in direct contact with the inner wall surface of the titanium ring and the conductive copper core respectively.

[0010] Furthermore, the side copper plate is in the shape of a circular ring, and its diameter is the same as the outer diameter of the copper ring. The two side walls of the copper ring are connected to the side copper plate by welding.

[0011] Furthermore, the side steel plate is in the shape of a circular ring plate, and its diameter is the same as the outer diameter of the steel ring, and the two side walls of the steel ring are connected to the side steel plate by welding.

[0012] Furthermore, a copper sleeve is sleeved on the outer surface of the steel shaft, and the copper sleeve and the steel shaft are fitted with an interference fit, and the contact surface between the copper sleeve and the side copper plate is connected to the side copper plate by welding.

[0013] Furthermore, the copper ring is formed by rolling a copper plate into a circle and then welding it, or by winding a flat copper strip or copper wire on the outer surface of a steel ring.

[0014] Furthermore, the steel ring and the copper ring are formed by rolling and welding the copper-steel explosion composite plate.

[0015] Furthermore, the titanium ring is made of a spun seamless titanium cylinder, or is made of a titanium plate that is rolled and then welded, and the inner surface of the titanium ring is silver-plated.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention evenly opens grooves along the circumferential direction on the inner wall of the titanium ring, and the conductive copper core is embedded in the grooves of the titanium ring to form a whole with the titanium ring, thereby making up for the disadvantage of the poor conductivity of the titanium ring itself, and greatly improving the conductivity of the large-sized cathode roller by improving the conductivity of the titanium layer on the surface of the cathode roller. In addition, the conductive copper core and the groove opened on the inner wall of the titanium ring are in an interference fit, and the conductive copper core can be in the shape of a strip or can be replaced by a copper rod, which is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the axial side cross-sectional structure of a high-conductivity large-size cathode roller for electrolytic copper foil of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall structure of a high-conductivity large-size cathode roller for electrolytic copper foil of the present invention;

[0020] Figure 3 It is a schematic diagram of the front cross-sectional structure of a high-conductivity large-size cathode roller for electrolytic copper foil of the present invention;

[0021] Figure 4 It is a schematic diagram of the titanium ring structure of the high-conductivity large-size cathode roller for electrolytic copper foil of the present invention;

[0022] Figure 5 The present invention is a schematic diagram of the assembly structure of the titanium ring and the conductive copper core of the high-conductivity large-size cathode roller for the electrolytic copper foil.

[0023] Among them, 1-titanium ring; 2-conductive copper core; 3-copper ring; 4-steel ring; 5-side steel plate; 6-side copper plate; 7-copper sleeve; 8-steel shaft. DETAILED DESCRIPTION

[0024] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0025] According to an embodiment of the present invention, referring to the attached Figure 1-5 As shown, the high-conductivity large-size cathode roller for electrolytic copper foil of the present invention comprises: a titanium ring 1, a conductive copper core 2, a copper ring 3, a steel ring 4, a side steel plate 5, a side copper plate 6, a copper sleeve 7 and a steel shaft 8. Among them, the titanium ring 1, the copper ring 3 and the steel ring 4 are all cylindrical structures, and their axes are all kept coincident with the axis of the steel shaft 8. The titanium ring 1 is located at the outermost side of the cathode roller, serving as the working surface for the production of electrolytic copper foil. The copper ring 3 and the steel ring 4 are arranged in sequence along the inner wall of the titanium ring 1 to the axial direction of the cathode roller, that is, the copper ring 3 is below the titanium ring 1, serving as a conductive layer during the electrolysis process, and the steel ring 4 is below the copper ring 3, serving as an internal support component of the cathode roller.

[0026] According to an embodiment of the present invention, the inner wall of the titanium ring 1 is evenly provided with a plurality of grooves along the circumferential direction for installing the conductive copper core 2. The conductive copper core 2 is embedded in the grooves of the titanium ring 1 and becomes a whole with the titanium ring 1 to enhance the conductive performance of the titanium ring 1. The side steel plate 5 is located on both sides of the cathode roller as the side support component of the cathode roller. It is an annular plate-like structure. The inner hole is connected to the outer wall of the steel shaft 8, and the outer diameter is in contact with the inner wall surface of the copper ring 3. The side copper plate 6 is located on the outside of the side steel plate 5 as the current transmission component of the cathode roller. It is an annular plate-like structure. The inner hole is in contact with the copper sleeve 7, and the outer cylindrical surface is in contact with the copper ring 3 and the conductive copper core 2 respectively. The copper sleeve 7 is a cylindrical structure, which is mounted on the steel shaft 8 and is located on both sides of the cathode roller. It serves as the current transmission component of the cathode roller.

[0027] According to an embodiment of the present invention, n grooves are evenly opened along the circumferential direction on the inner wall surface of the titanium ring 1 of the present invention for installing the conductive copper core 2. The conductive copper core 2 and the grooves opened on the inner wall of the titanium ring 1 are in an interference fit. The conductive copper core 2 can be in the shape of a bar or can be replaced by a copper rod.

[0028] According to an embodiment of the present invention, the copper ring 3 of the present invention is interference fitted with the titanium ring 1. After installation, the outer circular wall surface of the copper ring 3 is in contact with the inner wall surface of the titanium ring 1 and the conductive copper core 2 respectively, and the two side end surfaces of the copper ring 3 are connected to the side copper plate 5 by welding. The copper ring 3 can be prepared by rolling a copper plate and then welding it, or it can be replaced by winding a flat copper strip or copper wire on the outer surface of the steel ring 4.

[0029] According to an embodiment of the present invention, the steel ring 4 is prepared by welding after rolling a steel plate, the outer wall of the steel ring 4 contacts the inner wall of the copper ring 3, and the two side end faces of the steel ring 4 are connected to the side steel plate 5 by welding. The steel ring 4 and the copper ring 3 of the present invention can also be replaced by preparing them into an integral form by rolling a copper-steel explosion composite plate and then welding it.

[0030] According to an embodiment of the present invention, the copper sleeve 7 and the steel shaft 8 are connected by interference fitting, and the end surface of the copper sleeve 8 is connected by welding to the side copper plate 6. After the copper sleeve 7 and the steel shaft 8 are sleeved and assembled, a roller core which is an integral cathode roller is formed.

[0031] According to an embodiment of the present invention, the titanium ring 1 of the present invention can be prepared by spinning a seamless titanium cylinder, or by rolling a titanium plate and then welding it. The inner surface of the titanium ring 1 can be silver-plated to reduce the contact resistance between the titanium ring 1 and the copper ring 3.

[0032] In order to further illustrate the high-conductivity large-size cathode roller for electrolytic copper foil of the present invention, the following specific embodiments are used for detailed description.

[0033] Example 1

[0034] Produce a high-conductivity large-size cathode roller with a diameter of 3.6m.

[0035] The cathode roller includes a titanium ring 1, a conductive copper core 2, a copper ring 3, a steel ring 4, a side steel plate 5, and a side copper plate 6, all of which are aligned with the axis of the steel shaft 8. Among them, the titanium ring 1 is located at the outermost side and serves as the working surface for the production of electrolytic copper foil. The copper ring 3 is below the titanium ring 1 and serves as a conductive layer during the electrolysis process. The steel ring 4 is below the copper ring 3 and serves as an internal supporting component of the cathode roller. The inner wall of the titanium ring 1 is evenly provided with grooves along the circumferential direction for the installation of the conductive copper core 2. The built-in conductive copper core 2 is embedded in the groove of the titanium ring 1 and becomes a whole with the titanium ring 1 to enhance the conductive performance of the titanium ring 1. The side steel plate 5 is an annular structure and serves as the side support component of the cathode roller. It is located on both sides of the cathode roller. Its inner hole is connected to the outer wall of the steel shaft 8, and its outer diameter is in contact with the copper ring 3. The side copper plate 6 is a current transmission component of the cathode roller. It is located on the outside of the side steel plate 5 and has an annular structure. Its inner hole is in contact with the copper sleeve 7, and its outer cylindrical wall is in contact with the copper ring 3 and the conductive copper core 2 respectively. The copper sleeve 7 is a cylindrical structure and is mounted on the steel shaft 8. It is located on both sides of the cathode roller and serves as the current transmission component of the cathode roller.

[0036] In this embodiment, the outer diameter of the titanium ring 1 is 3600 mm, the wall thickness is 8 mm, and the inner wall of the titanium ring 1 is evenly provided with 32 grooves along the circumferential direction for installing the conductive copper core 2. The conductive copper core 2 and the inner wall grooves of the titanium ring 1 are in an interference fit, and the conductive copper core 2 is a strip structure. The conductive copper core 2 is made of T2 copper.

[0037] In this embodiment, the outer diameter of the copper ring 3 is 3585 mm, the thickness is 8 mm, and the copper ring 3 is interference-fitted with the titanium ring 1. After installation, the outer wall of the copper ring 3 is in contact with the inside of the titanium ring 1 and the conductive copper core 2 respectively, and the two side end faces of the copper ring 3 are connected to the side copper plate 6 by welding. The copper ring 3 is made by welding after the copper plate is rolled. The copper ring 3 and the side copper plate 6 are made of T2 copper, and the side steel plate 5 is made of Q235 steel.

[0038] In this embodiment, the steel ring 4 has an outer diameter of 3569 mm and a thickness of 30 mm. It is made by rolling a copper plate and then welding it. The outer wall of the steel ring 4 contacts the inner surface of the copper ring 3, and the two side end surfaces of the steel ring 4 are connected to the side steel plate 5 by welding. The steel ring 4 is made of Q235 steel.

[0039] In this embodiment, the copper sleeve 7 and the steel shaft 8 are connected by interference fitting, and the end surface of the copper sleeve 7 is connected to the side copper plate 6 by welding. The copper sleeve 7 is made of T2 copper, and the steel shaft 8 is made of 45 steel.

[0040] In this embodiment, the titanium ring 1 is made of TA1 pure titanium and is prepared by a spin forming process. The inner surface of the titanium ring 1 is silver-plated with a thickness of 10 μm.

[0041] Example 2

[0042] A highly conductive large-size cathode roller with a diameter of 3.0m was produced.

[0043] The cathode roller includes a titanium ring 1, a conductive copper core 2, a copper ring 3, a steel ring 4, a side steel plate 5, and a side copper plate 6, all of which are aligned with the axis of the steel shaft 8. Among them, the titanium ring 1 is located at the outermost side and serves as the working surface for the production of electrolytic copper foil. The copper ring 3 is below the titanium ring 1 and serves as a conductive layer during the electrolysis process. The steel ring 4 is below the copper ring 3 and serves as an internal supporting component of the cathode roller. The inner wall of the titanium ring 1 is evenly provided with grooves along the circumferential direction for the installation of the conductive copper core 2. The built-in conductive copper core 2 is embedded in the groove of the titanium ring 1 and becomes a whole with the titanium ring 1 to enhance the conductive performance of the titanium ring 1. The side steel plate 5 is an annular structure and serves as the side support component of the cathode roller. It is located on both sides of the cathode roller. Its inner hole is connected to the outer wall of the steel shaft 8, and its outer diameter is in contact with the copper ring 3. The side copper plate 6 is a current transmission component of the cathode roller. It is located on the outside of the side steel plate 5 and has an annular structure. Its inner hole is in contact with the copper sleeve 7, and its outer cylindrical wall is in contact with the copper ring 3 and the conductive copper core 2 respectively. The copper sleeve 7 is a cylindrical structure and is mounted on the steel shaft 8. It is located on both sides of the cathode roller and serves as the current transmission component of the cathode roller.

[0044] In this embodiment, the outer diameter of the titanium ring 1 is 3000 mm, the wall thickness is 8 mm, and the inner wall of the titanium ring 1 is evenly provided with 24 grooves along the circumferential direction for installing the conductive copper core 2. The conductive copper core 2 and the inner wall grooves of the titanium ring 1 are in an interference fit, and the conductive copper core 2 is a strip structure. The conductive copper core 2 is made of T2 copper.

[0045] In this embodiment, the outer diameter of the copper ring 3 is 2985 mm, the thickness is 25 mm, and the copper ring 3 is interference-fitted with the titanium ring 1. After installation, the outer wall of the copper ring 3 is in contact with the inside of the titanium ring 1 and the conductive copper core 2 respectively, and the two side end faces of the copper ring 3 are connected to the side copper plate 6 by welding. The copper ring 3 is made by welding after rolling the copper plate. The copper ring 3 and the side copper plate 6 are made of T2 copper, and the side steel plate 5 is made of Q235 steel.

[0046] In this embodiment, the steel ring 4 has an outer diameter of 2969 mm and a thickness of 25 mm. It is made by rolling a copper plate and then welding it. The outer wall of the steel ring 4 contacts the inner surface of the copper ring 3, and the two side end surfaces of the steel ring 4 are connected to the side steel plate 5 by welding. The steel ring 4 is made of Q235 steel.

[0047] In this embodiment, the copper sleeve 7 and the steel shaft 8 are connected by interference fitting, and the end surface of the copper sleeve 7 is connected to the side copper plate 6 by welding. The copper sleeve 7 is made of T2 copper, and the steel shaft 8 is made of 20 steel.

[0048] In this embodiment, the titanium ring 1 is made of TA1 pure titanium and is prepared by a spin forming process. The inner surface of the titanium ring 1 is silver-plated with a thickness of 8 μm.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A high-conductivity large-size cathode roller for electrolytic copper foil, characterized in that: include: A cylindrical titanium ring (1) is located at the outermost side, and a copper ring (3) and a steel ring (4) are arranged in sequence along the inner wall of the titanium ring (1) to the axial direction of the cathode roller. Side copper plates (6) and side steel plates (5) are fixedly connected in sequence from the outside to the inside on both sides of the copper ring (3). A steel shaft (8) is arranged along the axial direction of the cathode roller, and the two ends of the steel shaft (8) pass through the side steel plate (5) and the side copper plate (6) in sequence and then extend out. A plurality of conductive copper cores (2) are evenly installed along the circumferential direction on the inner wall of the titanium ring (1).

2. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The inner wall of the titanium ring (1) is evenly provided with a plurality of grooves along the circumferential direction, and the conductive copper core (2) is installed in the grooves.

3. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 2, characterized in that: The conductive copper core (2) is in the shape of a strip or a rod and is interference fitted with the groove.

4. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: After the copper ring (3) and the titanium ring (1) are interference-fitted, the outer wall surface of the copper ring (3) is in direct contact with the inner wall surface of the titanium ring (1) and the conductive copper core (2) respectively.

5. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The side copper plate (6) is in the shape of a circular ring, and its diameter is the same as the outer diameter of the copper ring (3). The two side walls of the copper ring (3) are connected to the side copper plate (6) by welding.

6. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The side steel plate (5) is in the shape of a circular ring plate, and its diameter is the same as the outer diameter of the steel ring (4). The two side walls of the steel ring (4) are connected to the side steel plate (6) by welding.

7. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: A copper sleeve (7) is sleeved on the outer surface of the steel shaft (8), and the copper sleeve (7) and the steel shaft (8) are fitted with an interference fit, and the contact surface between the copper sleeve (7) and the side copper plate (6) is connected to the side copper plate (6) by welding.

8. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The copper ring (5) is formed by welding a copper plate after rolling it into a circle, or by winding a flat copper strip or copper wire around the outer surface of the steel ring (4).

9. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The steel ring (4) and the copper ring (5) are formed by rolling a copper-steel explosion composite plate into a circle and then welding it.

10. The high-conductivity large-size cathode roller for electrolytic copper foil according to claim 1, characterized in that: The titanium ring (1) is made of a spun seamless titanium cylinder, or is made of a titanium plate rolled into a circle and then welded. The inner surface of the titanium ring (1) is silver-plated.

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