Tool for welding and welding equipment

Abstract

The utility model provides a tool for welding and welding equipment, the tool for welding is used for providing protective atmosphere for a weld joint formed in the welding process of an end cover and a shell of a battery, the tool for welding comprises a protective body, the protective body comprises an inner hole, an air flow channel, a plurality of air outlet holes and at least one air inlet hole, the inner hole is used for being matched with the periphery of the shell, and the air flow channel is used for being matched with the periphery of the shell. The gas flow channel is arranged in the wall body of the protection body, the multiple gas outlet holes are distributed in the hole wall of the inner hole in a dispersed mode and communicate with the gas flow channel and the area defined by the inner hole, the at least one gas inlet hole communicates with the gas flow channel, and the technical problem that due to failure of protection gas, a welding seam area becomes yellow or black can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, in particular to a welding tool and welding equipment. Background Art

[0002] Currently, large cylindrical batteries are increasingly favored by major automakers due to their high safety, long life, excellent fast charging performance, good battery consistency and low production cost.

[0003] Laser welding is a common process for sealing the negative electrode in cylindrical batteries. When both the negative terminal cap and the housing are made of stainless steel, the welding process requires the use of an inert gas shield to prevent oxidation at the weld mark. Existing welding processes are prone to yellowing or blackening of the weld seam due to shielding gas failure, affecting the product's aesthetics. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the present invention provides a welding tool and welding equipment to improve the technical problem of yellowing or blackening of the weld area caused by failure of the shielding gas.

[0005] To achieve the above-mentioned and other related objectives, the present invention provides a welding tool and welding equipment. The welding tool is used to provide a protective atmosphere for the weld formed during the welding process between the end cap and the battery shell. The tool comprises a protective body, which includes an inner hole, an air flow channel, multiple air outlet holes, and at least one air inlet hole. The inner hole is adapted to fit the outer periphery of the shell. The air flow channel is disposed within the wall of the protective body. Multiple air outlet holes are dispersedly arranged on the wall of the inner hole and connect the air flow channel and the area enclosed by the inner hole. At least one air inlet hole connects to the air flow channel.

[0006] In the above technical solution, the welding connection portion between the end cover and the shell is usually located at the periphery of the port of the shell, and the inner hole is adapted to the outer periphery of the shell, so that the weld can be covered in the inner hole, and a space for accommodating the protective gas is formed between the inner hole and the shell. The air flow channel formed in the wall of the protective body and the air inlet hole connected to the air flow channel can be set to fill the air flow channel with the protective gas provided by the external gas source, and then the protective gas is dispersedly blown into the space between the inner hole and the shell through multiple air outlet holes connected to the inner hole and the air flow channel, so that the weld formed by the welding of the end cover and the shell is always in the protective atmosphere during the welding process, preventing oxygen from oxidizing the weld, thereby improving the technical problem of yellowing or blackening of the weld area.

[0007] In an example of the welding tool of the present invention, there is a gap between the inner hole and the shell, and the size of the gap is a, 2.5mm≤a≤5mm.

[0008] In the above technical solution, the gap between the inner hole and the shell is the space for accommodating the protective gas. The gap is limited to between 2.5mm and 5mm, which can form a more ideal protective atmosphere without causing waste, improving the effect of isolating oxygen and being economical.

[0009] In an example of the welding tooling of the present invention, the protective body includes an inner ring and an outer ring that are connected together, the inner hole is set in the inner ring, the air flow channel is set in the inner ring and / or the outer ring, and each air outlet hole passes through the inner ring in a direction perpendicular to the axis of the inner hole, and at least one air inlet hole passes through the outer ring.

[0010] In the above technical solution, the inner ring and the outer ring are connected in a sleeve manner, the air inlet is set on the outer ring, the air outlet is set on the inner ring, and the air flow channel is set on the inner ring and / or the outer ring. This technical solution has good processing performance and reduces processing difficulty and processing cost.

[0011] In an example of the welding tooling of the present invention, the protective body further includes a light-shielding hole penetrating the inner ring and the outer ring, and the light-shielding hole is aligned with the joint surface of the end cover and the shell to allow the laser required for welding to pass through.

[0012] In the above technical solution, the light-shielding hole allows the laser from the welding gun and the shielding gas surrounding the gun to pass through to complete the welding of the end cap and shell interface. The provision of the light-shielding hole not only improves the positioning accuracy of the welding gun, thereby enhancing weld quality, but also guides the shielding gas, allowing it to diffuse along the shape of the light-shielding hole, thereby increasing the area of ​​the weld protected by the shielding gas and improving the surface quality of the weld.

[0013] In an example of the welding tooling of the present invention, multiple air outlet holes are evenly arranged along the circumference of the inner ring. Along the axial direction of the inner hole, the width of the inner ring is b, 6mm≤b≤10mm, and the diameter of the air outlet hole is c, 1mm≤c≤2mm.

[0014] In the above technical solution, the uniform distribution of the air outlet holes can improve the uniformity of the air blowing of multiple air outlet holes, making the protective atmosphere around the weld more uniform, so as to improve the surface quality of the weld. The width of the protective atmosphere space is limited by limiting the width of the inner ring. The limitation is within the range of 6mm≤b≤10mm, which can form a more ideal protective atmosphere without causing waste. The diameter of the air outlet holes is limited to the range of 1mm≤c≤2mm, which can achieve a certain air outlet speed of the air outlet holes. While isolating the air, it can also reduce the temperature of the weld surface. In addition, it can also prevent the protective gas from reducing the air outlet volume of other air outlet holes due to excessive air outlet at the air outlet holes close to the air inlet hole.

[0015] In an example of the welding tooling of the present invention, two air inlet holes are provided on the outer ring, and the two air inlet holes are arranged opposite to each other. Along the axial direction of the inner hole, the width of the outer ring is d, 6mm≤d≤12mm, and the diameter of the air inlet hole is e, 3mm≤e≤5mm.

[0016] In the above technical solution, by providing two opposing air inlet holes in the outer ring, uniformity of the shielding gas within the flow channel can be achieved, thereby improving the uniformity of the air blowing from the multiple air outlet holes, resulting in a more uniform shielding atmosphere around the weld and improving the surface quality of the weld. By limiting the width of the outer ring to define the width of the shielding atmosphere space, within the range of 6mm≤d≤12mm, a relatively ideal shielding atmosphere can be formed without waste. By limiting the diameter of the air inlet holes to the range of 3mm≤e≤5mm, a certain air inlet velocity can be achieved, which facilitates the shielding gas to fill the flow channel.

[0017] In one example of the welding tooling of the present invention, a first groove surrounding the outer circumference is provided on the outer circumference side of the inner ring, and a second groove corresponding to the position of the first groove is provided on the inner circumference side of the outer ring facing the inner ring, and the first groove and the second groove form an air flow channel.

[0018] In the above technical solution, a first groove is provided on the outer circumference of the inner ring, and a second groove is provided on the inner circumference of the outer ring, so that the first groove and the second groove are combined to form an air flow channel. The processing technology of this setting is simple, and the cross-section of the air flow channel can be maximized within the limited space of the inner ring and the outer ring. In addition, the first groove and the second groove are arranged around the inner ring to maximize the length of the air flow channel. In summary, this technical solution improves the utilization rate of the inner ring and the outer ring entities, so that the air flow channel can surround the weld in a larger range to provide a more ideal protective atmosphere, thereby improving the surface quality of the weld.

[0019] In an example of the welding tooling of the present invention, when the shell and the end cover are welded, the shell is installed on the mounting plate of the welding equipment, and the protective body is sleeved on the outer periphery of the welding point between the shell and the end cover. Along the axial direction of the inner hole, one side of the protective body is connected to a first baffle sleeved on the mounting plate, and the first baffle includes a first through hole adapted to the mounting plate, and the first through hole and the mounting plate are clearance-fitted.

[0020] In the above technical solution, the setting of the first baffle can prevent the shielding gas from leaking from the side of the shielding body, reducing the waste of shielding gas. Since the weld is located at the port of the shell, in order to make the inner hole completely cover the weld, one end of the shielding body needs to extend to the mounting plate, so the first baffle is mounted on the mounting plate, and the first through hole and the mounting plate are clearance-fitted, which not only facilitates the matching installation of the first baffle and the mounting plate, but also has a better effect of preventing the leakage of shielding gas.

[0021] In an example of the welding tooling of the present invention, along the axial direction of the inner hole, a second baffle is provided on the side of the protective body away from the first baffle, and the second baffle includes a second through hole adapted to the shell. The projection toward the second baffle is made in a direction perpendicular to the axis of the inner hole, and the contour line of the second through hole is located between the projection of the contour line of the inner hole and the projection of the outer contour line of the shell.

[0022] In the above technical solution, the setting of the second baffle can prevent the shielding gas from leaking from the side of the shielding body, reducing the waste of shielding gas. Since the weld is located at the port of the shell, in order to make the inner hole completely cover the weld, the end of the shielding body away from the first baffle extends to the shell and exceeds the weld, so the second baffle is mounted on the shell, and the contour line of the second through hole is between the projection of the inner hole contour line and the projection of the outer contour line of the shell, which makes it convenient for the battery to pass through the second through hole and be installed on the mounting plate, and the second baffle can also prevent the leakage of shielding gas.

[0023] In an example of the welding tool of the present invention, along a direction perpendicular to the axis of the inner hole, the distance between the first through hole and the mounting plate is smaller than the distance between the second through hole and the housing.

[0024] In the above technical solution, the distance between the second through hole and the shell is larger than the distance between the first through hole and the mounting plate, so that the welding smoke generated by welding can be discharged through the dust removal device on the side of the second baffle with a larger gap. This setting is beneficial to environmental protection and can further improve the surface quality of the weld.

[0025] In an example of the welding tool of the present invention, the welding tool further includes a fixing seat, and the protective body is installed on the fixing seat.

[0026] In the above technical solution, the fixing seat is used to install the protection body so that the protection body is fixed at a position where it can provide a protective atmosphere for the weld.

[0027] The utility model also provides a welding device, including any of the welding tooling items mentioned above, the welding device also including a mounting plate for fixing a battery, a gas supply system and a welding gun, the gas supply system including a welding gas pipe and at least one maintaining gas pipe, the welding gas pipe is used to release protective gas at the welding position, the maintaining gas pipe is connected to the air inlet, and the welding gun is used to perform welding operations.

[0028] In the above technical solution, by setting up welding tooling, a protective atmosphere can be provided for the weld during the welding process, so that the weld is always in the protective atmosphere until the welding is completed, thereby reducing the contact between the weld and oxygen, thereby improving the technical problem of yellowing or blackening of the weld area.

[0029] The utility model relates to a welding tool, which is used to provide a protective atmosphere for the weld formed between the end cover and the shell of the battery during the welding process. Since the welding connection portion between the end cover and the shell is usually located at the periphery of the port of the shell, the inner hole is adapted to the outer periphery of the shell, so that the weld can be covered in the inner hole, and a space for accommodating protective gas can be formed between the inner hole and the shell. The air flow channel formed in the wall of the protective body and the air inlet hole connected to the air flow channel can be set up so that the protective gas provided by the external gas source fills the air flow channel, and then the protective gas is dispersedly blown into the space between the inner hole and the shell through the multiple air outlet holes connected to the inner hole and the air flow channel, so that the weld formed by the welding of the end cover and the shell is always in the protective atmosphere during the welding process, thereby preventing the oxidation of the weld by oxygen, and thus improving the technical problem of yellowing or blackening of the weld area. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the overall structure of an example of welding tooling of the present invention;

[0032] Figure 2 This is a schematic diagram of an example of the welding tool of the present invention after a battery is placed in the tool;

[0033] Figure 3 This is an exploded view of a protective body of an example of welding tooling of the present invention;

[0034] Figure 4 A cross-sectional view of a protective body of an example of welding tooling of the present invention;

[0035] Figure 5 This is a partial structural diagram of an example of the welding equipment of the present invention;

[0036] Figure 6 This is a partial cross-sectional view of the protective body, mounting plate and battery in a working state in an example of the welding equipment of the present invention.

[0037] Component number description

[0038] 10. Welding tooling; 20. Mounting plate; 30. Welding air pipe; 40. Maintaining air pipe; 50. Welding gun; 60. Battery; 61. Housing; 62. End cover; 100. Protective body; 110. Inner hole; 120. Air flow channel; 130. Air outlet; 140. Air inlet; 150. Light shielding hole; 160. Inner ring; 161. First groove; 170. Outer ring; 171. Second groove; 180. First baffle; 181. First through hole; 190. Second baffle; 191. Second through hole; 200. Fixing seat. DETAILED DESCRIPTION

[0039] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following examples and the features in the examples can be combined with each other unless there is a conflict. It should also be understood that the terms used in the examples of the present invention are for the purpose of describing specific implementation methods, not for the purpose of limiting the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0040] When numerical ranges are given in the examples, it should be understood that unless otherwise specified herein, both endpoints of each numerical range and any value between the endpoints may be used. Unless otherwise defined, all technical and scientific terms used in this utility model are consistent with the prior art as understood by those skilled in the art and the description of this utility model. Any prior art methods, equipment, and materials similar or equivalent to those in the examples of this utility model may also be used to implement this utility model.

[0041] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0042] There are many forms of battery shell sealing. A common method is to weld the end cap and the port of the shell, usually using laser welding.

[0043] Specifically, the battery is secured to the welding equipment via a mounting plate that rotates with it. The welding gun is aligned with the mating surface between the end cap and the housing, and a shielding gas, typically an inert gas (such as helium or nitrogen), is provided around the welding gun to protect the molten pool, prevent oxidation and contamination, and ensure the quality and tightness of the weld. The welding gun then emits a high-energy-density laser beam. The heat from the laser beam melts the material, and the molten metal fills the mating surface. The mating surface between the end cap and the housing rotates with the mounting plate, forming a continuous weld, thereby connecting the cover plate and the housing.

[0044] The inventors found that blowing shielding gas only near the welding gun can only provide good protection for the area being welded, but it is difficult to provide continuous protection for the weld that has not yet fully cooled. As a result, the weld area that has not yet fully cooled and has left the weld will oxidize, resulting in yellowing or blackening, which affects the appearance of the product.

[0045] In view of this, the utility model provides a technical solution, in which a protective body is provided on the periphery of the joint surface of the end cover and the shell. The protective body can keep the weld formed by welding the end cover and the shell in a protective atmosphere at all times during the welding process, preventing oxygen from oxidizing the weld, thereby improving the technical problem of yellowing or blackening of the weld area.

[0046] See also Figures 1 to 6 The present invention provides a welding tool 10 and welding equipment. The welding tool 10 is used to provide a protective atmosphere for the weld formed during the welding process between the end cap 62 and the shell 61 of the battery 60. Specifically, the welding tool includes a protective body 100. The shape of the protective body 100 is not limited and can be a rectangular parallelepiped, a cylinder, a prism, or other irregular structures. The protective body 100 includes an inner hole 110, an air flow channel 120, a plurality of air outlet holes 130, and at least one air inlet hole 140. The protective body 100 can be formed by integral casting or can be formed by separately processing multiple parts and then assembling them. There is no limitation on this.

[0047] See also Figure 1 and Figure 2 Inner hole 110 is adapted to the outer circumference of shell 61. It can be understood that the shape of inner hole 110 corresponds to the shape of shell 61. For example, if shell 61 is circular, inner hole 110 is circular; if shell 61 is square, inner hole 110 is square; if shell 61 is polygonal, inner hole 110 is also polygonal; if shell 61 is irregular, inner hole 110 is an irregular shape corresponding to the outer shape of shell 61. In this embodiment, shell 61 is circular and inner hole 110 is circular. This arrangement can achieve the purpose of shielding the weld within inner hole 110 and forming a space for shielding gas between inner hole 110 and shell 61 to provide continuous protection for the entire weld.

[0048] See also Figure 1 and Figure 2 The airflow channel 120 is disposed within the wall of the shield 100. At least one air inlet 140 connects to the airflow channel 120, allowing shielding gas supplied from an external source to fill the airflow channel 120. The shape of the airflow channel 120 guides and restricts the flow of shielding gas, achieving targeted concentration. The shape of the airflow channel 120 is not limited. In this embodiment, it can be arc-shaped, partially surrounding the inner hole 110, or it can be annular, circumferentially encircling the entire inner hole 110. In other embodiments, when the shell 61 is polygonal, the airflow channel 120 is also configured as a polygonal ring corresponding to the shape of the shell 61. All of the above airflow channel 120 configurations can increase the area of ​​the weld protected by the shielding gas and alleviate the technical problem of yellowing or blackening of the weld area. There can be at least one air inlet 140, or multiple air inlet 140, without limitation, as long as the shielding gas can be supplied to the airflow channel 120 through the air inlet 140. The number of air inlet 140 can be adapted to the shape and size of the airflow channel 120.

[0049] Further, see Figure 3 and Figure 4 Each of the air outlet holes 130 is dispersedly arranged on the wall of the inner hole 110 and connects the air flow channel 120 and the area enclosed by the inner hole 110. The number of air outlet holes 130 is not limited and can be 2, 4, 6, 8, 10, 15, 20 or more. The number of air outlet holes 130 can be adaptively designed according to the circumference of the weld. The shape of the air outlet holes 130 is also not limited and can be circular, square or other irregular shapes. As long as the protective gas in the air flow channel 120 can be dispersedly blown into the space between the inner hole 110 and the shell 61, this arrangement can ensure that the weld formed by the welding of the end cover 62 and the shell 61 is always in a protective atmosphere during the welding process, preventing oxygen from oxidizing the weld, thereby improving the technical problem of yellowing or blackening of the weld area.

[0050] See also Figure 4 and Figure 6 In one example of the welding tool 10 of the present invention, a gap is defined between the inner hole 110 and the housing 61. This gap serves as a space for the shielding gas. If the gap is too small, it will not effectively isolate oxygen, while if it is too large, both space and shielding gas will be wasted. In this embodiment, the gap is defined as a, with a limit of 2.5 mm ≤ a ≤ 5 mm. For example, it can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm. This limit creates an ideal shielding atmosphere for the weld without causing waste, improving oxygen isolation and achieving economic efficiency.

[0051] Considering that the welding tool 10 is not suitable for small batch production, the casting process is not suitable for the welding tool 10 in the present invention. Figure 3 and Figure 4 The protective body 100 includes a sleeved inner ring 160 and an outer ring 170. This arrangement facilitates machining of the airflow channel 120, the air outlet 130, and the air inlet 140 by mechanical processing. Specifically, the inner hole 110 is arranged on the inner ring 160; the airflow channel 120 is arranged on the inner ring 160 and / or the outer ring 170, that is, the airflow channel 120 can be arranged only on the inner ring 160, or only on the outer ring 170, or partly on the inner ring 160 and partly on the outer ring 170, and there is no limitation on this; along the direction perpendicular to the axis of the inner hole 110, each air outlet 130 passes through the inner ring 160 to connect the airflow channel 120 and the inner hole 110; at least one air inlet 140 passes through the outer ring 170, and the light-shielding hole 150 passes through the inner ring 160 and the outer ring 170. This arrangement is suitable for single-piece small-batch production, has good processing technology performance, and reduces processing difficulty and processing cost.

[0052] Further, see Figure 3 and Figure 4 In one example of the welding tool 10 of the present invention, the protective body 100 further includes a light-shielding hole 150 extending through the inner ring 160 and the outer ring 170. Light-shielding hole 150 is aligned with the interface between the end cap 62 and the housing 61 to allow the laser light required for welding to pass through. Specifically, the laser from the welding gun 50 and the shielding gas surrounding the welding gun 50 pass through light-shielding hole 150 to complete the welding of the interface between the end cap 62 and the housing 61. The provision of light-shielding hole 150 not only improves the positioning accuracy of the welding gun 50, thereby enhancing welding quality, but also guides the shielding gas, allowing it to diffuse along the shape of light-shielding hole 150, thereby increasing the area of ​​the weld protected by the shielding gas and improving the surface quality of the weld.

[0053] See also Figure 3 and Figure 4In one example of the welding tool 10 of the present invention, multiple air outlet holes 130 are evenly arranged along the circumference of inner ring 160. This improves the uniformity of the air blown from these multiple air outlet holes 130, resulting in a more uniform protective atmosphere around the weld and improving the surface quality of the weld. Furthermore, along the axial direction of inner hole 110, the width of inner ring 160 is b, where 6mm≤b≤10mm. For example, it can be 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm. By limiting the width of inner ring 160, the width of the protective atmosphere space is also limited, thus creating a more ideal protective atmosphere without causing waste. The diameter of the air outlet 130 is c, 1mm≤c≤2mm, for example, it can be 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm or 2mm, etc. This limitation can achieve a certain air outlet speed for the air outlet 130, which can reduce the temperature of the weld surface while isolating the air. In addition, it can also prevent the protective gas from reducing the air outlet volume of other air outlets 130 due to excessive air outlet in the air outlet 130 near the air inlet 140.

[0054] See also Figure 3 and Figure 4 In one example of the welding tool 10 of the present invention, two air inlet holes 140 are provided on the outer ring 170. The two air inlet holes 140 are arranged relative to each other, which can achieve uniformity of the shielding gas in the air flow channel 120, thereby improving the uniformity of the blowing of the multiple air outlet holes 130, making the protective atmosphere around the weld more uniform, thereby improving the surface quality of the weld. Along the axial direction of the inner hole 110, the width of the outer ring 170 is d, 6mm≤d≤12mm, for example, it can be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm or 12mm, etc. This limitation can form a more ideal protective atmosphere without causing waste. The diameter of the air inlet hole 140 is e, 3mm≤e≤5mm, for example, it can be 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc., which can achieve a certain air intake speed for the air inlet hole 140, which is conducive to the shielding gas filling the air flow channel 120.

[0055] See also Figure 4 and Figure 6In one example of the welding tool 10 of the present invention, a first groove 161 surrounding the outer circumference is provided on the outer circumference of the inner ring 160, and a second groove 171 corresponding to the position of the first groove 161 is provided on the inner circumference of the outer ring 170 facing the inner ring 160. The first groove 161 and the second groove 171 form an airflow channel 120. This arrangement is simple to manufacture and can maximize the cross-section of the airflow channel 120 within the limited space between the inner ring 160 and the outer ring 170. In addition, the arrangement of the first groove 161 and the second groove 171 around the inner ring 160 maximizes the length of the airflow channel 120. In summary, this technical solution improves the utilization rate of the inner ring 160 and the outer ring 170 entities, allowing the airflow channel 120 to surround the weld in a wider range, thereby providing a more ideal protective atmosphere and improving the surface quality of the weld.

[0056] See also Figure 4 and Figure 6 In one example of the welding tool 10 of the present invention, when the shell 61 and the end cap 62 are welded, the shell 61 is mounted on the mounting plate 20 of the welding equipment. The protective body 100 is mounted on the outer periphery of the weld between the shell 61 and the end cap 62. Along the axial direction of the inner hole 110, a first baffle 180 mounted on the mounting plate 20 is connected to one side of the protective body 100. The provision of the first baffle 180 can prevent shielding gas from leaking from the side of the protective body 100, thereby reducing shielding gas waste. Since the weld is located at the end of the shell 61, in order to ensure that the inner hole 110 can completely cover the weld, one end of the protective body 100 needs to extend to the mounting plate 20, so the first baffle 180 is mounted on the mounting plate 20. The first baffle 180 includes a first through hole 181 that is compatible with the mounting plate 20. The first through hole 181 and the mounting plate 20 are clearance-fitted, which not only facilitates the coordinated installation of the first baffle 180 and the mounting plate 20, but also effectively prevents shielding gas leakage. In this embodiment, the outer diameter of the mounting plate 20 is the same as or similar to the outer diameter of the shell 61, so the size of the first through hole 181 can be limited to: projected toward the first baffle 180 in a direction perpendicular to the axis of the inner hole 110, and the contour line of the first through hole 181 is located between the projection of the contour line of the inner hole 110 and the projection of the outer contour line of the mounting plate 20.

[0057] See also Figure 4 and Figure 6In one example of the welding tool 10 of the present invention, a second baffle 190 is provided on the side of the protective body 100 facing away from the first baffle 180, along the axial direction of the inner hole 110, and is fitted over the housing 61. This second baffle 190 prevents shielding gas from leaking from the side of the protective body 100, reducing shielding gas waste. Since the weld seam is located at the end of the housing 61, to ensure that the inner hole 110 completely covers the weld seam, the end of the protective body 100 away from the first baffle 180 extends into the housing 61 and beyond the weld seam. Therefore, the second baffle 190 is fitted over the housing 61. The second baffle 190 includes a second through-hole 191 that mates with the housing 61. A projection perpendicular to the axis of the inner hole 110 onto the second baffle 190 reveals a contour line between the projection of the inner hole 110 contour line and the projection of the outer contour line of the housing 61. This arrangement facilitates installation of the battery 60 onto the mounting plate 20 through the second through-hole 191 and enables the second baffle 190 to prevent shielding gas leakage.

[0058] See also Figure 6 In one example of the welding fixture 10 of the present invention, the distance between the first through-hole 181 and the mounting plate 20, along a direction perpendicular to the axis of the inner hole 110, is smaller than the distance between the second through-hole 191 and the housing 61. The greater distance between the second through-hole 191 and the housing 61 than between the first through-hole 181 and the mounting plate 20 allows welding fumes to be discharged through a dust removal device on the side of the second baffle 190 with a larger gap. This configuration is environmentally friendly and can further improve the surface quality of the weld.

[0059] See also Figure 1 and Figure 5 In one example of the welding fixture 10 of the present invention, the welding fixture 10 further includes a fixing base 200, to which the protective body 100 is mounted. The shape and structure of the fixing base 200 are not limited, as long as it can be mounted on the protective body 100 and can be mounted at a fixed position of the welding equipment or other fixed position near the welding equipment. This arrangement allows the protective body 100 to be fixed in a position where it can provide a protective atmosphere for the weld without being affected by the rotation of the mounting plate 20. The fixing base 200 in this embodiment is a rectangular parallelepiped, with one end of the fixing base 200 detachably connected to the protective body 100, and the other end of the fixing base 200 mounted at a fixed position on the welding equipment.

[0060] See also Figure 5 The present invention also provides a welding device, including any one of the welding tooling 10 described above. By setting the welding tooling 10, a protective atmosphere can be provided for the weld during the welding process, so that the weld is always in the protective atmosphere until the welding is completed, thereby reducing the contact between the weld and oxygen, thereby improving the technical problem of yellowing or blackening of the weld area.

[0061] See also Figure 5 The welding equipment also includes a mounting plate 20 for securing the battery 60, a gas supply system, and a welding gun 50. The gas supply system includes a welding gas pipe 30 and at least one maintenance gas pipe 40. The welding gas pipe 30 is located adjacent to a light-shielding hole 150. The light-shielding hole 150 guides the protector to provide gas shielding for the molten pool formed by the high-temperature molten material of the welding gun 50, preventing oxidation and contamination. The shielding gas also diffuses along the shape of the light-shielding hole 150, increasing the area of ​​the weld protected by the shielding gas and thereby improving the surface quality of the weld. The maintenance gas pipe 40 is connected to the air inlet holes 140, and the number of maintenance gas pipes 40 matches the number of air inlet holes 140. The welding gun 50 performs welding operations through the light-shielding hole 150, which improves the positioning accuracy of the welding gun 50 and thus the welding quality.

[0062] It is understandable that the components listed in the welding equipment of the present invention do not cover all the components of the welding equipment, but are only the parts improved by the present invention. In fact, the welding equipment should also include necessary welding machines, clamping devices, cooling systems and control systems, etc., which will not be repeated here.

[0063] The present welding tool is used to provide a protective atmosphere for the weld seam formed during the welding process between the end cap and the shell of a battery. This allows the weld seam to be enclosed within an inner hole, creating a space between the inner hole and the shell to accommodate the shielding gas. Shielding gas supplied from an external gas source can then be dispersed and blown into the space between the inner hole and the shell through multiple outlet holes connecting the inner hole and the flow channel. This ensures that the weld seam formed by welding the end cap and the shell is always in a protective atmosphere during the welding process, preventing oxygen from oxidizing the weld seam and thereby alleviating the technical problem of yellowing or blackening in the weld seam area. Therefore, the present invention effectively overcomes several practical problems in the prior art and thus has high utility and practical significance. The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by persons of ordinary skill in the art without departing from the spirit and technical concept disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A welding tool for providing a protective atmosphere for the weld formed during the welding process of the end cover and the shell of the battery, characterized in that: The protective body comprises: an inner hole, adapted to fit the outer periphery of the housing; an air flow channel, disposed within the wall of the protective body; a plurality of air outlet holes, dispersedly arranged on the hole wall of the inner hole and connecting the air flow channel and the area surrounded by the inner hole; At least one air inlet hole is connected to the air flow channel.

2. The welding tool according to claim 1, characterized in that: There is a gap between the inner hole and the shell, and the size of the gap is a, wherein 2.5 mm≤a≤5 mm.

3. The welding tool according to claim 1, characterized in that: The protective body includes an inner ring and an outer ring that are connected in a sleeve manner. The inner hole is arranged on the inner ring, and the air flow channel is arranged on the inner ring and / or the outer ring. Along the direction perpendicular to the axis of the inner hole, each of the air outlet holes passes through the inner ring, and the at least one air inlet hole passes through the outer ring.

4. The welding tool according to claim 3, characterized in that: The protective body further comprises a light-shielding hole penetrating the inner ring and the outer ring, wherein the light-shielding hole is aligned with the joining surface of the end cover and the shell so as to allow the laser required for welding to pass through.

5. The welding tool according to claim 3, characterized in that: The plurality of air outlet holes are evenly arranged along the circumference of the inner ring, wherein, along the axial direction of the inner hole, the width of the inner ring is b, 6mm≤b≤10mm, and the diameter of the air outlet hole is c, 1mm≤c≤2mm.

6. The welding tool according to claim 3, characterized in that: Two air inlet holes are provided on the outer ring, and the two air inlet holes are arranged opposite to each other. The width of the outer ring along the axial direction of the inner hole is d, 6mm≤d≤12mm, and the diameter of the air inlet hole is e, 3mm≤e≤5mm.

7. The welding tool according to claim 3, characterized in that: The outer circumference of the inner ring is provided with a first groove surrounding the outer circumference, and the inner circumference of the outer ring facing the inner ring is provided with a second groove corresponding to the position of the first groove. The first groove and the second groove form the air flow channel.

8. The welding tool according to claim 2, characterized in that: When the shell and the end cover are welded, the shell is installed on the mounting plate of the welding equipment, and the protective body is sleeved on the outer periphery of the welding point between the shell and the end cover. Along the axial direction of the inner hole, one side of the protective body is connected to a first baffle sleeved on the mounting plate, and the first baffle includes a first through hole adapted to the mounting plate, and the first through hole and the mounting plate are clearance-fitted.

9. The welding tool according to claim 8, characterized in that: Along the axial direction of the inner hole, a second baffle is provided on the side of the protective body facing away from the first baffle, and the second baffle includes a second through hole adapted to the shell. The projection toward the second baffle is made in a direction perpendicular to the axis of the inner hole, and the contour line of the second through hole is located between the projection of the inner hole contour line and the projection of the outer contour line of the shell.

10. The welding tool according to claim 9, characterized in that: Along a direction perpendicular to the inner hole axis, a distance between the first through hole and the mounting plate is smaller than a distance between the second through hole and the housing.

11. The welding tool according to claim 1, characterized in that: The welding tool further comprises a fixing seat, and the protection body is mounted on the fixing seat.

12. A welding device, characterized in that: The welding tool comprises the welding tool according to any one of claims 1 to 11, the welding equipment also comprising a mounting plate for fixing the battery, a gas supply system and a welding gun, the gas supply system comprising a welding gas pipe and at least one maintaining gas pipe, the welding gas pipe being used to release shielding gas at the welding position, the maintaining gas pipe being connected to the gas inlet hole, and the welding gun being used to perform welding operations.

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