Welding nozzle, welding device and battery production line

Abstract

The utility model relates to the field of welding, and provides a welding nozzle, a welding device and a battery production line, the welding nozzle comprises an inner cylinder body, one end of the inner cylinder body is provided with an inlet for laser to enter, the other end of the inner cylinder body is provided with an outlet for laser to exit, and the cross section of the inner cylinder body is reduced along the advancing direction of the laser. The size of the outlet in the first direction is larger than that in the second direction, and the first direction is consistent with the arrangement direction of battery cells of the battery; the outer cylinder is sleeved on the outer side of the inner cylinder, an opening is formed in one end, close to the outlet, of the outer cylinder, the size of the opening in the first direction is larger than the size of the opening in the second direction, an air inlet channel is formed in the outer cylinder, and the air inlet channel is communicated with the space between the outer cylinder and the inner cylinder. The inner cylinder has larger space allowance in the arrangement direction of the battery cells, so that the position limitation of the welding nozzle is reduced, the laser can be irradiated to the preset position, and the problem that the distance between the welding nozzles is not matched with the distance between the pole columns in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding nozzle, a welding device and a battery production line. Background Art

[0002] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. During the laser welding process, the laser passes through the welding nozzle and irradiates the pre-welding position to form a molten pool to complete the welding.

[0003] In the battery production process, it is usually necessary to use laser welding to weld the poles of the battery cells. The battery module or battery pack includes multiple battery cells arranged in sequence. In order to improve efficiency, multiple welding nozzles are usually set up one by one to cover the corresponding battery cells for simultaneous welding.

[0004] However, since there are aerogel sheets between adjacent battery cells, and the thickness error of the aerogel sheets and the different extrusion forces on the aerogel sheets, the spacing between the battery cells is not the same. The laser irradiation position is easy to adjust to the same as the actual spacing of the battery cells, and the spacing of the welding nozzles is usually fixed. Therefore, during the welding process, the laser is easily irradiated on the welding nozzle, causing the problem of cold welding. Utility Model Content

[0005] The utility model provides a welding nozzle, a welding device and a battery production line, which are used to solve the defect in the prior art that the laser is easily irradiated onto the welding nozzle during the welding process.

[0006] On the one hand, the utility model provides a welding nozzle suitable for battery welding, comprising:

[0007] An inner cylinder, wherein one end of the inner cylinder is provided with an entrance for the laser to enter, and the other end is provided with an exit for the laser to emit, the cross section of the inner cylinder decreases along the traveling direction of the laser, the size of the exit in the first direction is larger than the size in the second direction, and the first direction is consistent with the arrangement direction of the battery cells;

[0008] An outer cylinder, wherein the outer cylinder is mounted on the outside of the inner cylinder, and an end of the outer cylinder close to the outlet has an opening, wherein the size of the opening in the first direction is larger than the size in the second direction, and an air intake passage is provided on the outer cylinder, wherein the air intake passage is connected to the space between the outer cylinder and the inner cylinder.

[0009] According to a welding nozzle provided by the utility model, the outlet of the inner cylinder is configured to be an ellipse, an oblong hole or a rectangle.

[0010] According to a welding nozzle provided by the utility model, the outer cylinder includes a truncated cone structure and a protruding structure arranged on the outer surface of the truncated cone structure, the protruding structure protrudes in a first direction or in the opposite direction of the first direction, the protruding structure extends along the generatrix direction of the truncated cone structure, the interior of the protruding structure is hollow, and the interior of the protruding structure is connected to the internal space of the truncated cone structure.

[0011] According to a welding nozzle provided by the utility model, the protruding structure is configured as a rectangular parallelepiped structure or an arc structure.

[0012] According to a welding nozzle provided by the utility model, the opening of the outer cylinder is configured to be an ellipse, an oblong hole or a rectangle.

[0013] A welding nozzle provided by the utility model also includes:

[0014] A connecting plate, which is sleeved on the outer side of the inner cylinder and connected to the inner cylinder;

[0015] A mounting plate is sleeved on the outside of the outer cylinder and connected to the outer cylinder, and the mounting plate is connected to the connecting plate.

[0016] According to a welding nozzle provided by the utility model, the air inlet passage is arranged on the mounting plate.

[0017] According to a welding nozzle provided by the utility model, a slot is provided on the mounting plate, and the connecting plate is arranged in the slot.

[0018] On the other hand, the utility model also provides a welding device, comprising the welding nozzle as described above.

[0019] On the other hand, the utility model also provides a battery production line, comprising the welding device as described above.

[0020] The welding nozzle provided by the utility model makes the size of the outlet of the inner cylinder in the first direction larger than the size in the second direction, and the first direction is consistent with the arrangement direction of the battery cells, so that the inner cylinder has a larger space margin in the arrangement direction of the battery cells, reduces the position limit of the welding nozzle, and enables the laser to irradiate the preset position, thereby improving the welding effect and quality, and increasing the service life of the welding nozzle, solving the problem of mismatch between the welding nozzle spacing and the pole spacing in the prior art.

[0021] In addition, the outer cylinder cover is arranged on the outside of the inner cylinder, and the outer cylinder is provided with an air intake channel connected to the space between the outer cylinder and the inner cylinder. During the welding process, the protective gas can be transported to the space between the outer cylinder and the inner cylinder through the air intake channel, and the protective gas is sprayed from the gap between the outlet and the opening, which can isolate the oxygen and moisture in the air and prevent oxidation and corrosion.

[0022] The welding device and the battery production line provided by the utility model include the welding nozzle provided by the utility model, and thus include all the above advantages of the welding nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the inner cylinder provided by an embodiment of the utility model;

[0025] Figure 2 yes Figure 1 The internal structure diagram of the inner cylinder shown;

[0026] Figure 3 It is a structural schematic diagram of the outer cylinder provided in an embodiment of the utility model;

[0027] Figure 4 yes Figure 3 Schematic diagram of the internal structure of the outer cylinder shown.

[0028] Reference numerals:

[0029] 1. Inner cylinder; 101. Inlet; 102. Outlet; 2. Outer cylinder; 201. Cone structure; 202. Protruding structure; 3. Connecting plate; 4. Mounting plate; 401. Slot; 402. Air inlet passage. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Combine the following Figure 1-Figure 4 The welding nozzle of the utility model is described.

[0032] Specifically, the welding nozzle is suitable for battery welding. The welding nozzle comprises an inner cylinder 1 and an outer cylinder 2.

[0033] Among them, an inlet 101 for laser entry is provided at one end of the inner cylinder 1, and an outlet 102 for laser emission is provided at the other end of the inner cylinder 1. Along the direction of travel of the laser, the cross section of the inner cylinder 1 decreases, that is, the end of the inner cylinder 1 for laser emission has the smallest cross section. The size of the outlet 102 in the first direction is larger than the size in the second direction, and the first direction is consistent with the arrangement direction of the battery cells, and the arrangement direction of the battery cells is the direction in which the aerosol sheets between the battery cells are compressed. Optionally, the second direction is perpendicular to the first direction. Optionally, the inner cylinder 1 is set to a copper structure.

[0034] The outer cylinder 2 is sleeved on the outer side of the inner cylinder 1, and there is a gap between the inner wall of the outer cylinder 2 and the outer wall of the inner cylinder 1. An opening is provided at one end of the outer cylinder 2 close to the outlet 102, and the size of the opening in one direction is larger than the size in the second direction, so that the outer cylinder 2 can adapt to the shape of the inner cylinder 1. An air inlet channel 402 is provided on the outer cylinder 2, and the air inlet channel 402 is communicated with the space between the outer cylinder 2 and the inner cylinder 1, and the air inlet channel 402 is used to connect to a protective gas source. Optionally, the outer cylinder 2 is set to a copper structure.

[0035] The welding nozzle provided in the embodiment of the utility model makes the size of the outlet 102 of the inner cylinder 1 in the first direction larger than the size in the second direction, and the first direction is consistent with the arrangement direction of the battery cells, so that the inner cylinder 1 has a larger space margin in the arrangement direction of the battery cells, reduces the position limit of the welding nozzle, forms an avoidance effect for the laser, and enables the laser to irradiate the preset position, thereby improving the welding effect and quality, and increasing the service life of the welding nozzle, solving the problem of mismatch between the welding nozzle spacing and the pole spacing in the prior art.

[0036] In addition, the outer cylinder 2 is covered on the outside of the inner cylinder 1, and the outer cylinder 2 is provided with an air inlet channel 402 connected to the space between the outer cylinder 2 and the inner cylinder 1. During the welding process, the protective gas can be transported to the space between the outer cylinder 2 and the inner cylinder 1 through the air inlet channel 402, and the protective gas is sprayed from the gap between the outlet 102 and the opening, which can isolate the oxygen and moisture in the air and prevent oxidation and corrosion.

[0037] refer to Figure 1 and Figure 2As shown, in some embodiments provided by the present invention, the outlet 102 of the inner cylinder 1 is set to an ellipse. For example, the inner cylinder 1 is set to a truncated cone structure 201, and the outlet 102 of the truncated cone structure 201 is formed into an elliptical structure by extrusion. In this way, the inner cylinder 1 has a simple structure and is easy to process.

[0038] Of course, the outlet 102 of the inner cylinder 1 is not limited to being set as an ellipse. For example, the outlet 102 of the inner cylinder 1 can also be set as an oblong hole or a rectangle. Among them, for the inner cylinder 1 with the outlet 102 set as an oblong hole, the inner cylinder 1 can be formed by splicing two arc plates and two flat plates, the two arc plates are arranged oppositely, the two flat plates are arranged oppositely, and the flat plates are connected to the arc plates. Among them, for the inner cylinder 1 with the outlet 102 set as a rectangle, the inner cylinder 1 can be set as a prism structure.

[0039] refer to Figure 3-Figure 4 As shown, in some embodiments provided by the present invention, the outer cylinder 2 includes a truncated cone structure 201 and a protruding structure 202 provided on the outer surface of the truncated cone structure 201 .

[0040] The protruding structure 202 protrudes in the first direction or the opposite direction of the first direction, and the protruding structure 202 extends along the generatrix direction of the truncated cone structure 201. The interior of the protruding structure 202 is hollow, and the interior of the protruding structure 202 is connected to the internal space of the truncated cone structure 201. The air intake channel 402 is connected to the interior of the protruding structure 202.

[0041] In this embodiment, a protruding structure 202 is provided on the outer surface of the truncated cone structure 201, and the protruding structure 202 protrudes in the first direction or the opposite direction of the first direction, and the protruding structure 202 is hollow inside and connected to the air inlet channel 402. On the one hand, the size of the outer cylinder 2 in the first direction is increased to adapt to the shape of the inner cylinder 1. On the other hand, the protruding structure 202 can act as a conveying channel, so that the space between the outer cylinder 2 and the inner cylinder 1 is increased, which is convenient for increasing the flow rate of the shielding gas and achieving better protection for welding.

[0042] Optionally, the protruding structure 202 is configured as a rectangular parallelepiped structure, or the protruding structure 202 may be configured as an arc-shaped structure.

[0043] Optionally, two protruding structures 202 are provided, and the two protruding structures 202 are respectively provided on both sides of the truncated cone structure 201 , and two air inlet channels 402 are provided, and the two air inlet channels 402 are respectively communicated with corresponding protruding structures 202 .

[0044] Of course, the outer cylinder 2 is not limited to the above-mentioned forms. For example, in other embodiments provided by the present invention, the opening of the outer cylinder 2 is set to an ellipse, an oblong hole or a rectangle. For example, for the outer cylinder 2 with an opening set to an ellipse, the outer cylinder 2 is set to a hollow truncated cone, and the opening of the truncated cone is formed into an elliptical structure by extrusion. For the outer cylinder 2 with an opening set to an oblong hole, the outer cylinder 2 can be formed by splicing two arc plates and two flat plates, the two arc plates are arranged oppositely, the two flat plates are arranged oppositely, and the flat plates are connected to the arc plates. For the outer cylinder 2 with an opening set to a rectangle, the outer cylinder 2 can be set to a prism structure.

[0045] In some embodiments provided by the present invention, the welding nozzle further includes a connecting plate 3 and a mounting plate 4 .

[0046] The connecting plate 3 is sleeved on the outer side of the inner cylinder 1 and connected to the inner cylinder 1. For example, the connecting plate 3 and the inner cylinder 1 are welded.

[0047] The mounting plate 4 is sleeved on the outer side of the outer cylinder 2 and connected to the outer cylinder 2 , and the mounting plate 4 is connected to the connecting plate 3 .

[0048] In this embodiment, the inner cylinder 1 is inserted into the outer cylinder 2 until the connecting plate 3 and the mounting plate 4 abut against each other, and the inner cylinder 1 reaches the accurate position, so that there is a suitable spacing between the inner cylinder 1 and the outer cylinder 2, that is, through the cooperation of the connecting plate 3 and the mounting plate 4, the inner cylinder 1 and the outer cylinder 2 also have an accurate relative position relationship, and the inner cylinder 1 and the outer cylinder 2 are connected by the connecting plate 3 and the mounting plate 4, and the connection structure is simpler.

[0049] Optionally, the connecting plate 3 and the mounting plate 4 are connected via a threaded connection.

[0050] In some embodiments provided by the present invention, the air inlet channel 402 is provided on the mounting plate 4, and the air inlet channel 402 is configured as an air inlet hole opened on the mounting plate 4. Such a configuration avoids opening a hole on the outer cylinder 2 to affect the structural strength of the outer cylinder 2.

[0051] In some embodiments provided by the utility model, a slot 401 is provided on the mounting plate 4, and the connecting plate 3 is provided in the slot 401. In this embodiment, by providing the connecting plate 3 in the slot 401, the connecting plate 3 can be positioned to prevent the connecting plate 3 from translating, thereby making the spacing between the inner cylinder 1 and the outer cylinder 2 evenly distributed. Further, the mounting plate 4 is configured as a rectangular plate, and the slot 401 is configured as a rectangular slot. Such a configuration can prevent the mounting plate 4 from rotating in the slot 401, thereby making the first direction of the inner cylinder 1 always consistent with the arrangement direction of the battery cells.

[0052] A welding device is also provided in an embodiment of the utility model.

[0053] Specifically, the welding device includes the welding nozzle as described above.

[0054] It should be noted that the welding device includes a welding nozzle, and also includes all the above advantages of the welding nozzle.

[0055] A battery production line is also provided in an embodiment of the utility model.

[0056] Specifically, a battery production line includes the welding device as described above.

[0057] It should be noted that the battery production line includes a welding nozzle, which also includes all the above advantages of the welding nozzle.

[0058] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0059] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "first aspect 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 utility model embodiment. 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, without contradiction.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A welding nozzle, characterized in that: Suitable for battery welding, including: An inner cylinder, wherein one end of the inner cylinder is provided with an entrance for the laser to enter, and the other end is provided with an exit for the laser to emit, the cross section of the inner cylinder decreases along the traveling direction of the laser, the size of the exit in the first direction is larger than the size in the second direction, and the first direction is consistent with the arrangement direction of the battery cells; An outer cylinder, wherein the outer cylinder is mounted on the outside of the inner cylinder, and an end of the outer cylinder close to the outlet has an opening, wherein the size of the opening in the first direction is larger than the size in the second direction, and an air intake passage is provided on the outer cylinder, wherein the air intake passage is connected to the space between the outer cylinder and the inner cylinder.

2. The welding nozzle according to claim 1, characterized in that The outlet of the inner cylinder is configured to be an ellipse, an oblong hole or a rectangle.

3. The welding nozzle according to claim 1, characterized in that The outer cylinder includes a conical structure and a protruding structure arranged on the outer surface of the conical structure, the protruding structure protrudes in a first direction or a direction opposite to the first direction, the protruding structure extends along the generatrix direction of the conical structure, the interior of the protruding structure is hollow, and the interior of the protruding structure is connected to the internal space of the conical structure, and the air intake passage is connected to the interior of the protruding structure.

4. The welding nozzle according to claim 3, characterized in that The protruding structure is configured as a rectangular parallelepiped structure or an arc-shaped structure.

5. The welding nozzle according to claim 1, characterized in that The opening of the outer cylinder is configured to be an ellipse, an oblong hole or a rectangle.

6. The welding nozzle according to any one of claims 1 to 5, characterized in that: Also includes: A connecting plate, which is sleeved on the outer side of the inner cylinder and connected to the inner cylinder; A mounting plate is sleeved on the outside of the outer cylinder and connected to the outer cylinder, and the mounting plate is connected to the connecting plate.

7. The welding tip according to claim 6, characterized in that The air inlet passage is arranged on the mounting plate.

8. The welding tip according to claim 6, characterized in that The mounting plate is provided with a slot, and the connecting plate is arranged in the slot.

9. A welding device, characterized in that: Comprising a welding nozzle as described in any one of claims 1-8.

10. A battery production line, characterized in that: Comprising the welding device as claimed in claim 9.

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