Laser welding device and battery cover plate production system

Abstract

The utility model provides a laser welding device and a battery cover plate production system. The laser welding device comprises a base and a laser welding assembly. The laser welding assembly is arranged on the base and moves in the first direction, the second direction and the third direction relative to the base, the laser welding assembly comprises a semiconductor laser, an optical fiber laser and a welding piece, and the semiconductor laser is movably connected with the optical fiber laser. The optical fiber laser moves in the first direction, the second direction and the third direction relative to the semiconductor laser, and laser of the semiconductor laser and laser of the optical fiber laser are both emitted out through the light emitting end of the welding piece; wherein the first direction, the second direction and the third direction are perpendicular to one another, and the laser spot diameter of the semiconductor laser is larger than that of the fiber laser. The laser welding device can improve the welding stability.

Description

Technical Field

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

[0002] In order to improve the performance and safety of lithium batteries, the welding of lithium battery cover poles is particularly important. Laser welding has high precision, can achieve micro-size welding, does not produce pollutants, is suitable for high-precision welding needs, and is suitable for welding of various materials and complex structures. Therefore, it has wide applicability in the production of lithium battery cover poles. When using traditional laser welding devices for welding, if it is necessary to meet the demand for large melt width, it is necessary to increase the laser spot. At this time, the welding power will be reduced, and the melt depth will be further reduced. If it is necessary to meet the demand for large melt depth, it is necessary to increase the welding power. At this time, the laser spot will be reduced, and the melt width will be further reduced. Therefore, traditional laser welding devices cannot meet the requirements of large melt width and large melt depth at the same time. When the assembly gap of the welding workpiece is large, the stability of the welding cannot be guaranteed. Utility Model Content

[0003] In view of this, the purpose of the utility model is to overcome the deficiencies in the prior art and provide a laser welding device that can improve the stability of welding.

[0004] The utility model also provides a battery cover production system.

[0005] The utility model provides the following technical solutions:

[0006] According to the laser welding device of the first aspect of the utility model, the laser welding device comprises: a base; a laser welding assembly, wherein the laser welding assembly is arranged on the base and moves relative to the base along a first direction, a second direction and a third direction, wherein the laser welding assembly comprises a semiconductor laser, a fiber laser and a welding piece, wherein the semiconductor laser is movably connected to the fiber laser and moves relative to the semiconductor laser along the first direction, the second direction and the third direction, wherein the laser of the semiconductor laser and the laser of the fiber laser are both emitted through the light output end of the welding piece; wherein the first direction, the second direction and the third direction are perpendicular to each other, and the laser spot diameter of the semiconductor laser is larger than the laser spot diameter of the fiber laser.

[0007] The laser welding device of the utility model has the following advantages:

[0008] In the above-mentioned laser welding device, since the laser of the semiconductor laser and the laser of the optical fiber laser are both emitted through the light output end of the welding part, the semiconductor laser and the optical fiber laser can be coaxially output, so that the semiconductor laser and the optical fiber laser can be used to weld the same welding point at the same time. During the welding process, the laser welding assembly can be moved relative to the base along the first direction, the second direction and the third direction, so that the focus of the laser spot emitted by the semiconductor laser is located at the welding position, and then the optical fiber laser is moved relative to the semiconductor laser along the first direction, so that the focus of the laser spot emitted by the optical fiber laser is located at the welding position. The focus of the emitted laser spot is located at the same position as the focus of the laser spot emitted by the semiconductor laser, thereby realizing simultaneous welding of the semiconductor laser and the fiber laser. Since the laser spot diameter of the semiconductor laser is larger than the laser spot diameter of the fiber laser, when the gap between the welded parts is large, the semiconductor laser can increase the molten width of the weld to meet the needs of welded parts with larger gaps. At the same time, since the fiber laser can move in the second direction and the third direction relative to the semiconductor laser, the molten width of the weld can be further increased by moving the fiber laser, thereby improving the stability of welding.

[0009] According to the laser welding device of the first aspect of the utility model, the diameter of the laser spot of the semiconductor laser is D1, and the diameter of the laser spot of the fiber laser is D2, which satisfies: 200μm≤D1≤400μm, 10μm≤D2≤30μm.

[0010] According to the laser welding device of the first aspect of the utility model, the laser welding device also includes a first driving component, the first driving component is arranged on the base, and the laser welding component is drivingly connected to the first driving component, and the first driving component drives the laser welding component to move along the first direction, the second direction and the third direction.

[0011] According to the laser welding device of the first aspect of the present utility model, the first driving component includes a first driving member, a second driving member and a third driving member, and the first driving member, the second driving member and the third driving member are all drivingly connected to the laser welding component, the first driving member drives the laser welding component to move along the first direction, the second driving member drives the laser welding component to move along the second direction, and the third driving member drives the laser welding component to move along the third direction.

[0012] According to the laser welding device of the first aspect of the present utility model, the laser welding device also includes a second driving component, which is arranged on the laser welding component and is connected to the fiber laser drive of the second driving component, and the second driving component drives the fiber laser to move along the first direction, the second direction and the third direction.

[0013] According to the laser welding device of the first aspect of the present utility model, the second driving assembly includes a fourth driving member, a fifth driving member and a sixth driving member, and the fourth driving member, the fifth driving member and the sixth driving member are all drivingly connected to the fiber laser, the fourth driving member drives the fiber laser to move along the first direction, the fifth driving member drives the fiber laser to move along the second direction, and the sixth driving member drives the fiber laser to move along the third direction.

[0014] According to the laser welding device of the first embodiment of the utility model, when the laser welding assembly welds the workpiece to be welded along the third direction, the maximum displacement of the fifth driving member driving the fiber laser to move along the second direction is L1, which satisfies: 0.1mm≤L1≤0.9mm;

[0015] Or when the laser welding assembly welds the workpiece to be welded along the second direction, the maximum displacement of the sixth driving member driving the fiber laser to move along the third direction is L2, which satisfies: 0.1mm≤L2≤0.9mm.

[0016] According to the laser welding device of the first aspect of the present invention, the laser welding device also includes a clamping assembly, which is arranged near the light-emitting end of the welding part, and is used to clamp multiple parts to be welded, and the multiple parts to be welded are arranged at intervals along the second direction or the third direction.

[0017] According to the laser welding device of the first aspect of the utility model, the laser welding device also includes a blowing protective gas component, and the blowing protective gas component is arranged on the welding part, and the blowing protective gas component is arranged close to the light emitting end of the welding part.

[0018] According to the second aspect of the present invention, a battery cover production system includes: the laser welding device as described above.

[0019] The battery cover production system of the utility model has the following advantages:

[0020] In the above-mentioned battery cover plate production system, since the above-mentioned laser welding device can improve the stability of welding, the above-mentioned battery cover plate production system can improve the product yield of the battery cover plate.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a laser welding device according to an embodiment of the utility model is shown;

[0024] Figure 2 A schematic diagram showing the structure of a laser welding assembly, a second driving assembly and a protective gas blowing assembly according to an embodiment of the utility model is shown;

[0025] Figure 3 A schematic diagram showing the structure of a base and a first drive assembly according to an embodiment of the utility model is shown;

[0026] Figure 4 A schematic structural diagram of a base, a first driving assembly and a clamping assembly according to an embodiment of the utility model is shown.

[0027] Description of main component symbols:

[0028] 100-base;

[0029] 200-laser welding assembly; 210-semiconductor laser; 220-fiber laser; 230-welding part;

[0030] 300 - first driving assembly; 310 - first driving member; 320 - second driving member; 330 - third driving member;

[0031] 400 - second drive assembly; 410 - fifth drive member; 420 - sixth drive member;

[0032] 500-clamping assembly; 510-clamping piece;

[0033] 600-Blowing protective gas assembly. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] Reference Figure 1 As shown, the laser welding device involved in the embodiment of the utility model includes: a base 100 and a laser welding assembly 200.

[0040] Specifically, the laser welding assembly 200 is disposed on the base 100, and the laser welding assembly 200 moves relative to the base 100 along a first direction, a second direction and a third direction, the laser welding assembly 200 includes a semiconductor laser 210, a fiber laser 220 and a welding part 230, the semiconductor laser 210 is movably connected to the fiber laser 220, and the fiber laser 220 moves relative to the semiconductor laser 210 along a first direction, a second direction and a third direction, and the lasers of the semiconductor laser 210 and the fiber laser 220 are both emitted through the light output end of the welding part 230; wherein the first direction, the second direction and the third direction are perpendicular to each other, and the laser spot diameter of the semiconductor laser 210 is larger than the laser spot diameter of the fiber laser 220.

[0041] It should be noted that the first direction is Figure 1 The direction indicated by z, the second direction is Figure 1 The direction pointed by x in the middle, the third direction is Figure 1 The direction that y points to.

[0042] In the above-mentioned laser welding device, since the laser of the semiconductor laser 210 and the laser of the fiber laser 220 are both emitted through the light-emitting end of the welding piece 230, the semiconductor laser 210 and the fiber laser 220 can be coaxially output. In this way, the semiconductor laser 210 and the fiber laser 220 can be used to weld the same welding point at the same time. During the welding process, the laser welding assembly 200 can be moved relative to the base 100 along the first direction, the second direction and the third direction so that the focus of the laser spot emitted by the semiconductor laser 210 is located at the welding position, and then the fiber laser 220 is moved relative to the semiconductor laser 210 along the first direction so that the fiber laser The focus of the laser spot emitted by 220 and the focus of the laser spot emitted by the semiconductor laser are located at the same position, thereby realizing simultaneous welding of the semiconductor laser 210 and the fiber laser 220. Since the laser spot diameter of the semiconductor laser 210 is larger than the laser spot diameter of the fiber laser 220, when the gap between the welding parts 230 is large, the semiconductor laser 210 can increase the molten width of the weld to meet the welding parts 230 with larger gaps. At the same time, since the fiber laser 220 can move along the second direction and the third direction relative to the semiconductor laser 210, the molten width of the weld can be further increased by moving the fiber laser 220, thereby improving the stability of welding.

[0043] Specifically, in the above-mentioned embodiment, when the laser output power of the fiber laser 220 is large, problems such as spatter and porosity are prone to occur, resulting in an unsightly weld appearance. Since the semiconductor laser 210 has a preheating function, the weld 230 can be preheated by the semiconductor laser 210 to reduce the probability of problems such as spatter and porosity, thereby improving the aesthetic appearance of the weld.

[0044] Specifically, the diameter of the laser spot of the semiconductor laser 210 is D1, and the diameter of the laser spot of the fiber laser 220 is D2, which satisfies: 200 μm≤D1≤400 μm, 10 μm≤D2≤30 μm.

[0045] More specifically, in the above embodiments, D1 may be 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, etc., and D2 may be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc.

[0046] It can be understood that, since the diameter D1 of the laser spot of the semiconductor laser 210 and the diameter D2 of the laser spot of the fiber laser 220 satisfy: 200μm≤D1≤400μm, 10μm≤D2≤30μm, the laser spot of the semiconductor laser 210 can be much larger than the laser spot of the fiber laser 220, so that the semiconductor laser 210 can meet the welding of wider welds. At the same time, since the laser spot of the fiber laser 220 is smaller, the spot of the fiber laser 220 can be more concentrated, so that the fiber laser 220 has a stronger laser output power, thereby The penetration depth of the weld is made deeper, thereby improving the stability of the weld. When D1≤200μm, the semiconductor laser 210 will not be able to meet the welding requirements of a wider weld and will not have a larger weld penetration width. When D1≥400μm, the laser output power of the semiconductor laser 210 will be too low, which will lead to reduced stability of the weld. When D2≤10μm, the fiber laser 220 is required to have a higher power, thereby increasing the use cost and maintenance cost of the above-mentioned laser welding device. When D2≥30μm, the laser output power of the fiber laser 220 cannot meet the demand for a larger penetration depth.

[0047] Reference Figure 1 as well as Figure 3 As shown, the laser welding device includes a first driving component 300, which is arranged on the base 100, and the laser welding component 200 is drivingly connected to the first driving component 300, and the first driving component 300 drives the laser welding component 200 to move along the first direction, the second direction and the third direction.

[0048] Specifically, in the above-mentioned embodiment, the first driving component 300 has a first driving member 310, a second driving member 320 and a third driving member 330. The first driving member 310 drives the laser welding component 200 to move in a first direction, the second driving member 320 drives the laser welding component 200 to move in a second direction, and the third driving member 330 drives the laser welding component 200 to move in a third direction.

[0049] It can be understood that the laser welding assembly 200 can be driven to move along the first direction, the second direction and the third direction by the first driving assembly 300, so that the laser welding assembly 200 can be located on the same straight line as the welding position in the first direction, and at the same time, the focus of the laser spot emitted through the light-emitting end of the welding member 230 can fall on the welding position. When welding the workpiece to be welded, the laser welding assembly 200 can be driven to move along the second direction by the second driving member 320, so that the laser welding assembly 200 can weld the workpiece to be welded along the second direction. Similarly, the laser welding assembly 200 can be driven to move along the third direction by the third driving member 330, so that the laser welding assembly 200 can weld the workpiece to be welded along the third direction, so that the laser welding assembly 200 can weld according to the preset welding trajectory.

[0050] Reference Figure 1 as well as Figure 2 As shown, the laser welding device also includes a second driving component 400, which is disposed on the laser welding component 200 and is connected to the fiber laser 220 for driving. The second driving component 400 drives the fiber laser 220 to move in the first direction, the second direction, and the third direction.

[0051] Specifically, in the above-mentioned embodiment, the second driving assembly 400 includes a fourth driving member (not shown), a fifth driving member 410 and a sixth driving member 420. The fourth driving member drives the fiber laser 220 to move in a first direction, the fifth driving member 410 drives the fiber laser 220 to move in a second direction, and the sixth driving member 420 drives the fiber laser 220 to move in a third direction.

[0052] Furthermore, in the above-mentioned embodiment, when the position of the optical fiber laser 220 in the first direction needs to be adjusted, the fourth driving member can be manually driven to drive the optical fiber laser 220 to move along the first direction.

[0053] It is understandable that, during the debugging stage of the laser welding assembly 200, the fifth driving member 410 can be used to drive the fiber laser 220 to move in the second direction, and the sixth driving member 420 can be used to drive the fiber laser 220 to move in the third direction, so as to ensure the coaxiality of the light beam emitted by the fiber laser 220 and the light beam emitted by the semiconductor laser 210, and then the fourth driving member can be used to drive the fiber laser 220 to move in the first direction, so as to ensure that the focus of the light beam emitted by the fiber laser 220 and the light beam emitted by the semiconductor laser 210 are located on the same plane. During the welding process of the laser welding assembly 200 on the workpiece to be welded, the sixth driving member 420 is used to drive the fiber laser 220 to swing in the third direction, so as to increase the molten width, thereby meeting the requirements of a large molten width weld.

[0054] Specifically, in the above-mentioned embodiment, the weld width can be between 0.2 mm and 2 mm, so that the weld width can be above 1 mm, and the weld depth can be between 0.1 mm and 2 mm, so that the weld depth can be above 1 mm, thereby improving the stability of welding.

[0055] Specifically, when the laser welding assembly 200 welds the workpiece to be welded along the third direction, the maximum displacement of the fifth driving member 410 driving the optical fiber laser to move along the second direction is L1, satisfying: 0.1mm≤L1≤0.9mm; or when the laser welding assembly 200 welds the workpiece to be welded along the second direction, the maximum displacement of the sixth driving member 420 driving the optical fiber laser to move along the third direction is L2, satisfying: 0.1mm≤L2≤0.9mm.

[0056] More specifically, in the above-mentioned embodiments, the maximum displacement L1 of the fifth driving member 410 driving the optical fiber laser 220 to move along the second direction can be 0.1 mm, 0.4 mm, 0.6 mm, 0.9 mm, etc., and the specific value is determined in combination with the laser spot diameter of the semiconductor laser 210; the maximum displacement L2 of the sixth driving member 420 driving the optical fiber laser 220 to move along the third direction can be 0.1 mm, 0.4 mm, 0.6 mm, 0.9 mm, etc., and the specific value is determined in combination with the laser spot diameter of the semiconductor laser 210.

[0057] It can be understood that when the laser welding assembly 200 welds the workpiece to be welded along the third direction, the maximum displacement L1 of the fifth driving member 410 driving the optical fiber laser to move along the second direction satisfies: 0.1mm≤L1≤0.9mm, so that the laser welding assembly 200 can have a certain amount of swing in the second direction. In this way, when it is necessary to increase the molten width of the weld in the second direction, the laser welding assembly 200 can be swung in the second direction to increase the molten width of the weld, and to improve the welding accuracy and avoid welding at non-welding positions. When L1≤0.1mm, the displacement of the optical fiber laser 220 in the second direction is too small, and it cannot meet the needs of welds with larger molten widths. When L1≥0.9mm, the displacement of the optical fiber laser 220 in the second direction is too large, thereby resulting in poor welding accuracy. Reduced; similarly, when the laser welding assembly 200 welds the workpiece to be welded along the second direction, the sixth driving member 420 drives the optical fiber laser to move in the third direction. The maximum displacement L2 satisfies: 0.1mm≤L2≤0.9mm, so that the laser welding assembly 200 can have a certain amount of swing in the third direction. In this way, when it is necessary to increase the molten width of the weld in the third direction, the laser welding assembly 200 can be swung in the third direction to increase the molten width of the weld, and to improve the welding accuracy and avoid welding at non-welding positions. When L≤0.1mm, the displacement of the optical fiber laser 220 in the third direction is too small to meet the needs of welds with larger molten widths. When L≥0.9mm, the displacement of the optical fiber laser 220 in the third direction is too large, thereby reducing the welding accuracy.

[0058] Specifically, in the above-mentioned embodiments, when the fiber laser 220 is swung along the second direction or the third direction to increase the weld width, the fiber laser 220 moves in a circular shape, a straight line shape, an 8-shape shape, or a zigzag shape.

[0059] Reference Figure 4 As shown, the laser welding device also includes a clamping assembly 500, which is arranged near the light-emitting end of the welding part 230. The clamping assembly 500 is used to clamp multiple parts 230 to be welded, and the multiple parts 230 to be welded are arranged at intervals along the second direction or the third direction.

[0060] Specifically, in the above-mentioned embodiment, the clamping assembly 500 includes a plurality of clamping members 510 , and the plurality of clamping members 510 are arranged at intervals along the second direction or the third direction, and each clamping member 510 is used for clamping a workpiece 230 to be welded.

[0061] It can be understood that by clamping multiple parts 230 to be welded at the same time through the clamping assembly, the multiple parts 230 to be welded can be welded in sequence by moving the laser welding assembly 200 along the second direction or the third direction, thereby improving the welding efficiency.

[0062] Reference Figure 1 as well as Figure 2 As shown, the laser welding device further includes a shielding gas blowing component 600 , which is disposed on the welding piece 230 and is disposed close to the light emitting end of the welding piece 230 .

[0063] It is understandable that the protective gas blowing assembly 600 disposed near the light emitting end of the welding piece 230 can protect the lens of the laser welding assembly 200 from being contaminated by flying dust, thereby extending the service life of the laser welding assembly 200.

[0064] The battery cover plate production system involved in the embodiment of the utility model includes: the above-mentioned laser welding device.

[0065] Specifically, in the above-mentioned embodiment, the above-mentioned laser welding device is used to weld the poles of the battery cover.

[0066] In the above-mentioned battery cover plate production system, since the above-mentioned laser welding device can improve the stability of welding, the above-mentioned battery cover plate production system can improve the product yield of the battery cover plate.

[0067] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0068] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0069] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A laser welding device, characterized in that: include: Base; A laser welding assembly, wherein the laser welding assembly is disposed on the base and moves relative to the base along a first direction, a second direction, and a third direction, the laser welding assembly comprises a semiconductor laser, an optical fiber laser, and a welding piece, the semiconductor laser is movably connected to the optical fiber laser, and the optical fiber laser moves relative to the semiconductor laser along the first direction, the second direction, and the third direction, and the lasers of the semiconductor laser and the optical fiber laser are both emitted through the light-emitting end of the welding piece; The first direction, the second direction and the third direction are perpendicular to each other, and the laser spot diameter of the semiconductor laser is larger than the laser spot diameter of the optical fiber laser.

2. The laser welding device according to claim 1, characterized in that: The diameter of the laser spot of the semiconductor laser is D1, and the diameter of the laser spot of the fiber laser is D2, which satisfies: 200 μm≤D1≤400 μm, 10 μm≤D2≤30 μm.

3. The laser welding device according to claim 1, characterized in that: The laser welding device also includes a first driving component, which is arranged on the base and is drivingly connected to the laser welding component. The first driving component drives the laser welding component to move along the first direction, the second direction and the third direction.

4. The laser welding device according to claim 3, characterized in that: The first driving component includes a first driving member, a second driving member and a third driving member. The first driving member, the second driving member and the third driving member are all drivingly connected to the laser welding component. The first driving member drives the laser welding component to move along the first direction, the second driving member drives the laser welding component to move along the second direction, and the third driving member drives the laser welding component to move along the third direction.

5. The laser welding device according to any one of claims 1 to 4, characterized in that: The laser welding device also includes a second driving component, which is arranged on the laser welding component and is connected to the fiber laser drive. The second driving component drives the fiber laser to move along the first direction, the second direction and the third direction.

6. The laser welding device according to claim 5, characterized in that: The second driving assembly includes a fourth driving member, a fifth driving member and a sixth driving member, and the fourth driving member, the fifth driving member and the sixth driving member are all drivingly connected to the fiber laser. The fourth driving member drives the fiber laser to move along the first direction, the fifth driving member drives the fiber laser to move along the second direction, and the sixth driving member drives the fiber laser to move along the third direction.

7. The laser welding device according to claim 6, characterized in that: When the laser welding assembly welds the workpiece to be welded along the third direction, the maximum displacement of the fifth driving member driving the optical fiber laser to move along the second direction is L1, which satisfies: 0.1 mm ≤ L1 ≤ 0.9 mm; Or when the laser welding assembly welds the workpiece to be welded along the second direction, the maximum displacement of the sixth driving member driving the fiber laser to move along the third direction is L2, which satisfies: 0.1mm≤L2≤0.9mm.

8. The laser welding device according to any one of claims 1 to 4, characterized in that: The laser welding device further comprises a clamping assembly, which is arranged close to the light emitting end of the welding piece, and is used for clamping a plurality of pieces to be welded, and the plurality of pieces to be welded are arranged at intervals along the second direction or the third direction.

9. The laser welding device according to any one of claims 1 to 4, characterized in that: The laser welding device further comprises a protective gas blowing component, which is arranged on the welding part and is arranged close to the light emitting end of the welding part.

10. A battery cover production system, characterized in that: include: The laser welding device according to any one of claims 1 to 9.

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