Graphite electrode welding head for soft copper bar welding

Abstract

This utility model belongs to the technical field of soft copper busbar welding structure, specifically relating to a graphite electrode welding head for soft copper busbar welding, including a substrate, a heating plate, and a graphite electrode. The heating plate and the graphite electrode are sequentially disposed on the substrate. The graphite electrode includes a graphite block and a functional coating. The graphite block has a first end face, a second end face, and a peripheral side face. The first end face and the second end face are disposed opposite to each other, and the peripheral side face connects the first end face and the second end face. The first end face abuts against the heating plate, and the second end face is provided with a welding area. The functional coating includes a first high-temperature anti-oxidation coating, which is disposed in the welding area. The first high-temperature anti-oxidation coating can form a protective layer in the welding area, preventing the welding area of ​​the graphite block from becoming loose or powdery due to high-temperature oxidation, and effectively avoiding the graphite particles in the welding area from falling off and contaminating the welding part of the workpiece during the welding process.

Description

Technical Field

[0001] This utility model belongs to the technical field of soft copper busbar welding structure, specifically relating to a graphite electrode welding head for soft copper busbar welding. Background Technology

[0002] Polymer diffusion welding, also known as diffusion welding, is a solid-state welding method that involves applying pressure to a workpiece at high temperature without producing visible deformation or relative movement.

[0003] Diffusion welding machines can weld multiple stacked copper sheets together to form commonly used soft copper busbars. In existing diffusion welding processes, the heating blocks of the upper and lower welding heads press against each other against the soft copper busbar, while a large current is applied to heat the busbar; the temperature of the heating blocks is typically 600–900°C. However, the heating blocks of the welding heads are made of graphite. Graphite begins to oxidize at around 400°C, and oxidation increases dramatically above 750°C, intensifying further with rising temperature. This high-temperature oxidation and corrosion causes the graphite surface to gradually become porous, powdery, and even peel off, resulting in particulate contamination of the weldment. Utility Model Content

[0004] The purpose of this utility model is to provide a graphite electrode welding head for welding soft copper busbars, which addresses the shortcomings of existing technologies and solves the technical problem that oxidation and corrosion under high-temperature conditions cause the graphite surface to gradually become loose, powdery, or even peel off, resulting in particulate matter contaminating the welded parts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a graphite electrode welding head for welding soft copper busbars, including a substrate, a heating plate, and a graphite electrode. The heating plate and the graphite electrode are sequentially disposed on the substrate. The graphite electrode includes a graphite block and a functional coating. The graphite block has a first end face, a second end face, and a peripheral side face. The first end face and the second end face are disposed opposite to each other. The peripheral side face connects the first end face and the second end face. The first end face abuts against the heating plate. The second end face is provided with a welding area. The functional coating includes a first high-temperature anti-oxidation coating, which is disposed in the welding area.

[0007] In some embodiments, the first high-temperature antioxidant coating covers the welding area;

[0008] Alternatively, the first high-temperature antioxidant coating forms a patterned structure in the coated area.

[0009] In some embodiments, the functional coating further includes a second high-temperature antioxidant coating, the second high-temperature antioxidant coating covering the peripheral side surface;

[0010] Alternatively, the second high-temperature antioxidant coating forms the patterned structure on the peripheral side surface.

[0011] In some embodiments, the second high-temperature antioxidant coating covers the first end face;

[0012] Alternatively, the second high-temperature antioxidant coating forms the patterned structure on the first end face.

[0013] In some embodiments, the pattern structure is a mesh structure, a strip structure, or a dot structure.

[0014] In some embodiments, the pattern structures of the pattern structure located in the welding area, the pattern structure located on the peripheral side surface, and the pattern structure located on the first end face are all different.

[0015] Alternatively, all three may have the same pattern structure;

[0016] Alternatively, two of the three patterns may be identical.

[0017] In some embodiments, the first high-temperature antioxidant coating and the second high-temperature antioxidant coating are coating structures with the same structure.

[0018] In some embodiments, the area S of the second end face and the area M of the welding area satisfy the relationship: M≤S.

[0019] In some embodiments, the thickness of the second high-temperature antioxidant coating is less than or equal to the thickness of the first high-temperature antioxidant coating.

[0020] In some embodiments, a cold water plate is disposed between the heating plate and the substrate, one of the heating plate and the cold water plate is provided with a slider, and the other of the heating plate and the cold water plate is provided with a groove, and the slider is slidably connected to the groove.

[0021] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0022] This utility model discloses a graphite electrode welding head for welding soft copper busbars. Through the combined use of a substrate, a heating plate, and a graphite electrode, the heating plate and graphite electrode are sequentially mounted on the substrate, effectively achieving the installation of the heating plate and graphite electrode. The graphite electrode includes a graphite block and a functional coating. The first end face of the graphite block abuts against the heating plate. The functional coating includes a first high-temperature anti-oxidation coating. A welding zone is provided on the second end face of the graphite block, which is used for direct contact with the workpiece. The first high-temperature anti-oxidation coating is placed on the welding zone, forming a protective layer that effectively inhibits high-temperature oxidation of the welding zone. This prevents the welding zone of the graphite block from becoming loose or powdery due to high-temperature oxidation, effectively avoiding the detachment of graphite particles from the welding zone during the welding process and contaminating the welding part of the workpiece. This ensures that no impurities are introduced into the welding part of the workpiece, reducing quality risks such as incomplete welding and detachment caused by impurities.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the graphite electrode welding head of this utility model.

[0026] Figure 2 This is a schematic diagram of the assembly of the heating plate and graphite electrode of this utility model.

[0027] Figure 3 This is one of the structural schematic diagrams of the graphite electrode of this utility model.

[0028] Figure 4 This is the second schematic diagram of the graphite electrode of this utility model.

[0029] Figure 5 This is one of the structural schematic diagrams of the pattern structure of this utility model.

[0030] Figure 6 This is the second schematic diagram of the pattern structure of this utility model.

[0031] Figure 7 This is the third schematic diagram of the pattern structure of this utility model.

[0032] Figure 8This is a schematic diagram of the assembly of the cold water plate and the heating plate of this utility model.

[0033] Figure 9 This is a schematic diagram of the structure of the cooling water plate of this utility model.

[0034] The reference numerals in the attached figures are explained as follows:

[0035] 100. Graphite electrode welding head;

[0036] 10. Substrate;

[0037] 20. Heating plate;

[0038] 30. Graphite electrode; 31. Graphite block; 311. First end face; 312. Second end face; 313. Peripheral side face; 314. Welding area; 32. Functional coating; 321. First high-temperature anti-oxidation coating; 322. Second high-temperature anti-oxidation coating; 323. Pattern structure;

[0039] 40. Cooling plate; 41. Receptacle; 42. Inlet; 43. Outlet; 44. First fin unit; 441. First fin unit; 45. Second fin unit; 451. Second fin unit;

[0040] 50. Slider;

[0041] 60. Slide groove;

[0042] a) The length direction of the cold water plate; b) The width direction of the cold water plate. Detailed Implementation

[0043] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0044] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] The following will be combined with the appendix Figures 1-9 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0047] Please see Figures 1-9 The graphite electrode welding head 100 for welding soft copper busbars according to an embodiment of the present invention includes a substrate 10, a heating plate 20, and a graphite electrode 30. The heating plate 20 and the graphite electrode 30 are sequentially disposed on the substrate 10. The graphite electrode 30 includes a graphite block 31 and a functional coating 32. The graphite block 31 has a first end face 311, a second end face 312, and a peripheral side face 313. The first end face 311 and the second end face 312 are disposed opposite to each other. The peripheral side face 313 connects the first end face 311 and the second end face 312. The first end face 311 abuts against the heating plate 20. The second end face 312 is provided with a welding area 314. The functional coating 32 includes a first high-temperature anti-oxidation coating 321, which is disposed in the welding area 314.

[0048] Compared with the prior art, the graphite electrode welding head 100 for soft copper busbar welding in this embodiment of the present invention, through the cooperative use of the substrate 10, the heating plate 20 and the graphite electrode 30, with the heating plate 20 and the graphite electrode 30 sequentially disposed on the substrate 10, effectively realizes the installation of the heating plate 20 and the graphite electrode 30. The graphite electrode 30 includes a graphite block 31 and a functional coating 32. The first end face 311 of the graphite block 31 abuts against the heating plate 20. The functional coating 32 includes a first high-temperature anti-oxidation coating 321. The second end face 312 of the graphite block 31 is provided with a welding area 314. The welding area 314 is used to directly contact the workpiece. The first high-temperature anti-oxidation coating 321 is provided in the welding area 314. The first high-temperature anti-oxidation coating 321 can form a protective layer in the welding area 314, effectively inhibiting the high-temperature oxidation of the welding area 314. This prevents the welding area 314 of the graphite block 31 from becoming loose or powdery due to high-temperature oxidation. It effectively avoids the graphite particles in the welding area 314 from falling off and contaminating the welding part of the workpiece during the welding process, ensuring that there are no impurities in the welding part of the workpiece, and reducing quality risks such as false welding and desoldering caused by impurities.

[0049] It should be noted that the base plate 10 is used to connect to the output end of the booster cylinder mechanism, and the output end of the booster cylinder mechanism drives the base plate 10 to rise or fall. The base plate 10 can also be used to connect to the mounting platform of the mounting base.

[0050] It should be noted that the heating plate 20 is electrically connected to the power supply structure and can play a heating role.

[0051] Please see Figures 1-7 In some embodiments, the first high-temperature anti-oxidation coating 321 covers the welding area 314; or, the first high-temperature anti-oxidation coating 321 forms a patterned structure 323 in the welding area 314. When the first high-temperature anti-oxidation coating 321 covers the welding area 314, it can provide all-round coverage, forming a protective layer on the surface of the welding area 314, providing maximum protection for the welding area 314, and preventing the areas not covered by the first high-temperature anti-oxidation coating 321 from becoming loose or powdery at high temperatures when partially coated. When the first high-temperature anti-oxidation coating 321 forms a patterned structure 323 in the welding area 314, the recessed or uncoated areas of the patterned structure 323 can retain exposed graphite areas, avoiding the overall impedance of the heat conduction path to the full coverage coating, ensuring that the heat from the heating plate 20 can be transferred to the welding part of the workpiece more efficiently, and reducing temperature loss.

[0052] Please see Figures 1-7In some embodiments, the functional coating 32 further includes a second high-temperature anti-oxidation coating 322, which covers the peripheral side surface 313; or, the second high-temperature anti-oxidation coating forms the pattern structure 323 on the peripheral side surface 313. By providing the second high-temperature anti-oxidation coating 322, although the peripheral side surface 313 does not directly contact the workpiece, it can still become porous or powdery at high temperatures. By applying the second high-temperature anti-oxidation coating 322 to the peripheral side surface 313 of the graphite block 31, high-temperature oxidation of the peripheral side surface 313 is effectively suppressed, thereby preventing the peripheral side surface 313 of the graphite block 31 from becoming porous or powdery due to high-temperature oxidation, effectively ensuring the structural integrity of the graphite block 31.

[0053] When the second high-temperature anti-oxidation coating 322 covers the peripheral side 313, it can provide all-round coverage, forming a protective layer on the surface of the peripheral side 313. This provides maximum protection for the peripheral side 313 and prevents areas not covered by the second high-temperature anti-oxidation coating 322 from becoming loose or powdery at high temperatures during partial coating. When the second high-temperature anti-oxidation coating 322 forms a pattern structure 323 on the peripheral side 313, graphite has excellent thermal conductivity. If a full-coverage coating is used, the second high-temperature anti-oxidation coating 322 may slightly hinder heat dissipation. However, the pattern structure 323 can form heat dissipation channels for the graphite block 31 by reserving exposed graphite areas, enhancing the heat dissipation capacity of the graphite block 31, avoiding coating cracking and graphite embrittlement caused by local overheating, and ensuring temperature stability during welding.

[0054] Please see Figures 1-7 In some embodiments, the second high-temperature anti-oxidation coating 322 covers the first end face 311; or, the second high-temperature anti-oxidation coating 322 forms the pattern structure 323 on the first end face 311. By providing the second high-temperature anti-oxidation coating 322, the first end face 311 is used to abut against the heating plate 20. The second high-temperature anti-oxidation coating 322 on the first end face 311 effectively suppresses high-temperature oxidation of the first end face 311, thereby preventing the first end face 311 of the graphite block 31 from becoming loose or powdery due to high-temperature oxidation. This effectively ensures the flatness of the first end face 311 and guarantees the tightness of the contact between the first end face 311 and the heating plate 20, thereby ensuring heat conduction efficiency.

[0055] When the second high-temperature anti-oxidation coating 322 covers the first end face 311, it provides comprehensive coverage, forming a protective layer on the surface of the first end face 311. This effectively prevents the first end face 311 from becoming porous or powdery due to high-temperature oxidation, ensuring the flatness of the first end face 311 and the tightness of contact between the first end face 311 and the heating plate 20, thereby guaranteeing heat transfer efficiency. When the second high-temperature anti-oxidation coating 322 forms a patterned structure 323 on the first end face 311, graphite has excellent thermal conductivity. While the second high-temperature anti-oxidation coating 322 may have slight thermal resistance, the patterned structure 323 can reduce the thermal resistance of the second high-temperature anti-oxidation coating 322 to the first end face 311 by reserving exposed graphite areas, thus ensuring heat transfer efficiency.

[0056] Please see Figures 5-7 In some embodiments, the pattern structure 323 is a mesh structure, a strip structure, or a dot structure. When the pattern structure 323 is a mesh structure, the mesh structure forms a gridded protective layer on the corresponding end faces through the crisscrossing coating lines, and the exposed graphite areas are reserved through the mesh gaps to form heat conduction channels or heat dissipation channels. The mesh gaps are evenly distributed, effectively ensuring the uniform distribution of heat conduction channels or heat dissipation channels, avoiding coating cracking and graphite embrittlement caused by local overheating, and ensuring temperature stability during welding. When the pattern structure 323 is a strip structure, the grooves between the strips reserve exposed graphite areas to form heat conduction channels or heat dissipation channels. The mesh gaps are evenly distributed, effectively ensuring the uniform distribution of heat conduction channels or heat dissipation channels, avoiding coating cracking and graphite embrittlement caused by local overheating, and ensuring temperature stability during welding. When the pattern structure 323 is a dotted structure, exposed graphite areas are reserved between the dots to form heat conduction or heat dissipation channels. The mesh gaps are evenly distributed, which effectively ensures that the heat conduction or heat dissipation channels are evenly distributed, avoiding coating cracking and graphite embrittlement caused by local overheating, and ensuring temperature stability during the welding process.

[0057] In some embodiments, the pattern structure 323 located in the welding area 314, the pattern structure 323 located on the peripheral side surface 313, and the pattern structure 323 located on the first end face 311 are all different; or, the pattern structures 323 are all the same; or, two of the pattern structures 323 are the same.

[0058] When all three components (pattern structure 323) have the same pattern structure 323, a single coating template can be used, eliminating the need for frequent template changes during production and improving efficiency. Simultaneously, touch-up materials and tools (such as repair templates) can be standardized, eliminating the need for multiple touch-up solutions for different areas and reducing maintenance difficulty and costs. When all three components have different pattern structures 323, different areas can select the corresponding pattern structure 323 according to actual needs, improving functional adaptability. When two of the three components have the same pattern structure 323, areas with similar functional requirements are merged, achieving significant performance improvements without excessively increasing manufacturing costs.

[0059] In some embodiments, the first high-temperature anti-oxidation coating 321 and the second high-temperature anti-oxidation coating 322 are coating structures with identical structures. By making the first high-temperature anti-oxidation coating 321 and the second high-temperature anti-oxidation coating 322 structurally identical, the uniformity of the manufacturing processes for both coatings is effectively ensured, reducing variables in the production process and improving the overall reliability of the product. Simultaneously, it avoids the potential risks of chemical incompatibility or electrochemical corrosion between different coating materials, thus improving long-term reliability.

[0060] In some embodiments, the area S of the second end face 312 and the area M of the welding area 314 satisfy the relationship: M ≤ S. By setting the area S of the second end face 312 and the area M of the welding area 314, when M < S, the welding area 314 is located within the second end face 312, and an exposed graphite area is formed between the edge of the welding area 314 and the edge of the second end face 312. This exposed graphite area visually contrasts with the welding area 314 coated with the first high-temperature anti-oxidation coating 321, allowing operators or machine vision systems to quickly and accurately identify and locate the welding area 314, facilitating workpiece clamping and alignment, and also facilitating subsequent inspection of the coating's integrity. When M = S, the welding area 314 covers the second end face 312, eliminating the need for area demarcation on the second end face 312. The first high-temperature anti-oxidation coating 321 can be directly applied to the second end face 312, effectively saving processing time.

[0061] In some embodiments, the thickness of the second high-temperature anti-oxidation coating 322 is less than or equal to the thickness of the first high-temperature anti-oxidation coating 321. With the provision of the first and second high-temperature anti-oxidation coatings 321, when the thickness of the second high-temperature anti-oxidation coating 322 is less than the thickness of the first high-temperature anti-oxidation coating 321, the first high-temperature anti-oxidation coating 321 is thicker than the second high-temperature anti-oxidation coating 322. Since the first high-temperature anti-oxidation coating 321 is disposed in the welding area 314, which is used for direct contact with the workpiece, the thicker first high-temperature anti-oxidation coating 321 can extend the wear life and avoid rapid wear of the coating due to high-frequency welding, thereby exposing graphite and causing powdering contamination. When the thickness of the second high-temperature anti-oxidation coating 322 is equal to the thickness of the first high-temperature anti-oxidation coating 321, since both the first and second high-temperature anti-oxidation coatings 321 and 322 have the same thickness and the same coating structure, the internal stress distribution generated during the curing process is more uniform, reducing the risk of coating cracking.

[0062] In some embodiments, both the first high-temperature antioxidant coating 321 and the second high-temperature antioxidant coating 322 comprise boric acid, borax, and aluminum phosphate.

[0063] Please see Figure 1 , Figures 8-9 In some embodiments, a cold water plate 40 is disposed between the heating plate 20 and the substrate 10, and the heating plate 20 and the cold water plate 40 are detachably connected. The cold water plate 40, positioned between the heating plate 20 and the substrate 10, is used to block heat conduction during the welding process, effectively preventing damage to other components due to the high-temperature environment that directly affects the performance and lifespan of the welding equipment. The detachable connection between the heating plate 20 and the cold water plate 40 facilitates the installation and removal of the heating plate 20 and the graphite electrode 30.

[0064] Furthermore, one of the heating plate 20 and the cold water plate 40 is provided with a slider 50, and the other of the heating plate 20 and the cold water plate 40 is provided with a sliding groove 60. The slider 50 and the sliding groove 60 are slidably connected. Through the cooperation of the slider 50 and the sliding groove 60, the heating plate 20 and the cold water plate 40 are slidably connected, effectively realizing the installation or removal of the heating plate 20 and the cold water plate 40. At the same time, the slider 50 and the sliding groove 60 cooperate to form a guiding structure, so that the relative position between the heating plate 20 and the cold water plate 40 can be automatically reset during the installation or removal process, avoiding problems such as installation misalignment or loose connection caused by manual alignment error, and ensuring the consistency and reliability of assembly.

[0065] It should be noted that, in order to improve the connection between the heating plate 20 and the cold water plate 40, both the slider 50 and the slide 60 are provided with threaded holes. The threaded holes of the slider 50 and the slide 60 are in corresponding positions. The fasteners pass through the threaded holes of the slider 50 and the slide 60 in sequence, and the fasteners are threadedly connected to the threaded holes of the slider 50 and the slide 60.

[0066] Please see Figure 9 In some embodiments, the cold water plate 40 has a receiving cavity 41. One end of the cold water plate 40 is provided with a water inlet 42, and the other end of the cold water plate 40 is provided with a water outlet 43. Both the water inlet 42 and the water outlet 43 are connected to the receiving cavity 41. The receiving cavity 41 is provided with a plurality of first fin units 44 and a plurality of second fin units 45. Along the width direction b of the cold water plate 40, the plurality of first fin units 44 and the plurality of second fin units 45 are arranged alternately. Each first fin unit 44 includes a plurality of first fin elements 441. The plurality of first fin elements 441 are spaced apart along the length direction a of the cold water plate 40. Each second fin unit 45 includes a plurality of second fin elements 451. The plurality of second fin elements 451 are spaced apart along the length direction a of the cold water plate 40. Along the width direction b of the cold water plate 40, two adjacent first fin elements 441 and second fin elements 451 are staggered.

[0067] By arranging the first fin unit 441 and the second fin unit 451, the flow path of the cold fluid is effectively made complex and tortuous. During the flow process, the cold fluid needs to continuously collide, separate, flow around, and mix, thereby generating strong eddies and turbulence in the flow channel. This effectively improves the heat exchange efficiency of the cooling plate 40 and avoids heat dissipation lag caused by local heat accumulation in the cooling plate 40. At the same time, it effectively extends the residence time of the cold fluid, ensuring that the cold fluid carries away sufficient heat and avoiding waste when the cold fluid flows out without fully absorbing heat.

[0068] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A graphite electrode welding head for welding soft copper busbars, characterized in that: The device includes a substrate (10), a heating plate (20), and a graphite electrode (30). The heating plate (20) and the graphite electrode (30) are sequentially disposed on the substrate (10). The graphite electrode (30) includes a graphite block (31) and a functional coating (32). The graphite block (31) has a first end face (311), a second end face (312), and a peripheral side face (313). The first end face (311) and the second end face (312) are disposed opposite to each other. The peripheral side face (313) connects the first end face (311) and the second end face (312). The first end face (311) abuts against the heating plate (20). The second end face (312) is provided with a welding area (314). The functional coating (32) includes a first high-temperature anti-oxidation coating (321). The first high-temperature anti-oxidation coating (321) is disposed in the welding area (314).

2. The graphite electrode welding head for welding soft copper busbars as described in claim 1, characterized in that: The first high-temperature anti-oxidation coating (321) covers the welding area (314); Alternatively, the first high-temperature antioxidant coating (321) forms a patterned structure (323) in the welding area (314).

3. The graphite electrode welding head for welding soft copper busbars as described in claim 2, characterized in that: The functional coating (32) further includes a second high-temperature antioxidant coating (322), which covers the peripheral side surface (313); Alternatively, the second high-temperature antioxidant coating forms the pattern structure (323) on the peripheral side surface (313).

4. The graphite electrode welding head for welding soft copper busbars as described in claim 3, characterized in that: The second high-temperature anti-oxidation coating (322) covers the first end face (311); Alternatively, the second high-temperature anti-oxidation coating (322) forms the pattern structure (323) on the first end face (311).

5. The graphite electrode welding head for welding soft copper busbars as described in claim 4, characterized in that: The pattern structure (323) is a mesh structure, a strip structure or a dot structure.

6. The graphite electrode welding head for welding soft copper busbars as described in claim 5, characterized in that: Among the pattern structure (323) located in the welding area (314), the pattern structure (323) located on the peripheral side (313), and the pattern structure (323) located on the first end face (311), the pattern structures (323) are all different. Alternatively, the pattern structures (323) of the three are all the same; Alternatively, two of the three patterns (323) are identical.

7. The graphite electrode welding head for welding soft copper busbars as described in claim 3, characterized in that: The first high-temperature anti-oxidation coating (321) and the second high-temperature anti-oxidation coating (322) have the same coating structure.

8. The graphite electrode welding head for welding soft copper busbars as described in claim 1, characterized in that: The area S of the second end face (312) and the area M of the welding area (314) satisfy the relationship: M≤S.

9. The graphite electrode welding head for welding soft copper busbars as described in claim 5, characterized in that: The thickness of the second high-temperature antioxidant coating (322) is less than or equal to the thickness of the first high-temperature antioxidant coating (321).

10. The graphite electrode welding head for welding soft copper busbars as described in any one of claims 1 to 9, characterized in that: A cold water plate (40) is provided between the heating plate (20) and the base plate (10). One of the heating plate (20) and the cold water plate (40) is provided with a slider (50), and the other of the heating plate (20) and the cold water plate (40) is provided with a groove (60). The slider (50) and the groove (60) are slidably connected.

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