Laser welding device and system

Abstract

The utility model discloses a laser welding device and system. The laser welding device comprises a copper nozzle assembly, a fixing base and a flexible shielding assembly. The fixed seat comprises a laser outlet; the copper nozzle assembly is arranged on the laser outlet in a sliding fit mode. And the flexible shielding assembly is used for shielding a gap between the copper nozzle assembly and the laser outlet. According to the laser welding device, the distance between the copper nozzles is adjusted, the distance from protective gas to a welding point is shortened, welding slag is prevented from splashing all around, and therefore the flexibility, the protection effect and the overall welding quality of the welding copper nozzle device are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production equipment, and particularly relates to a laser welding device and system. Background Art

[0002] In the battery manufacturing industry, the stability of the battery structure and the reliability of electrical connection are directly related to the performance, safety and service life of the battery. The connection between the tab of the battery and the outer shell top cover, as a bridge between the internal circuit of the battery and external devices, is of particular importance. The tab, as the lead-out end of the positive and negative electrodes inside the battery, is responsible for transmitting current, while the top cover serves as a closed component of the battery and also bears part of the electrical connection function. Therefore, effective welding between the tab and the top cover has become an essential key link in the battery manufacturing process.

[0003] Traditionally, there are various welding methods for the tab and the top cover of the battery, including but not limited to resistance welding, ultrasonic welding, etc. However, with the continuous progress of battery technology and the increasing requirements for production efficiency and product quality, laser welding technology has gradually become the mainstream choice due to its unique advantages. Laser welding technology has been widely used in the battery manufacturing field due to its characteristics of high precision, high efficiency and low heat-affected zone. During the laser welding process, the laser welding copper nozzle, as one of the core components, plays a crucial role. It not only accurately guides the laser beam to the welding point, but also bears the heavy responsibility of protecting the welding area from external pollution and oxidation. In the prior art, some technicians have improved the copper nozzle welding equipment. By changing the shape of the copper nozzle, the situation of light blocking by the circular copper nozzle in the related technology can be solved, thereby avoiding the problem of incomplete welding. However, the above-mentioned laser welding equipment still has many problems, which limit the further improvement of its applicability and welding quality. The positions of the two copper nozzles of the traditional laser welding equipment are relatively fixed, and the distance between them cannot be adjusted, making it unable to be compatible with multiple models of products. As a result, when processing multiple models of products, the welding copper nozzles need to be frequently replaced or adjusted, reducing production efficiency and flexibility. The gas inlet of the shielding gas is often set on a fixed seat far from the welding line, which causes the shielding gas to pass through a long distance before reaching the welding area. This not only increases gas consumption, but also reduces the concentration of the shielding gas when it reaches the welding point, resulting in poor shielding effect. The traditional laser welding device has no effective measures to prevent the welding slag from splashing everywhere. Currently, during welding, the welding slag flies out randomly and uncontrollably, which may not only pollute the working environment, but also cause damage to the equipment itself and the operators, and also affect the quality of the welding joint.

[0004] In summary, in order to avoid the above-mentioned many disadvantages of the current laser welding device, the current laser welding device has been optimized and designed, and a new laser welding device is proposed. Summary of the Utility Model

[0005] The object of the present utility model is to provide a laser welding device and system for the above-mentioned deficiencies, which realizes the adjustment of the distance between the copper nozzles, shortens the path of the shielding gas to the welding point, and prevents the welding slag from splashing everywhere, thereby improving the flexibility, shielding effect and overall welding quality of the copper nozzle welding device. To achieve the above object, the present utility model provides the following technical solutions:

[0006] A laser welding device includes a copper nozzle assembly, a fixed seat and a flexible shielding assembly; the fixed seat includes a laser outlet; the copper nozzle assembly is slidably fitted on the laser outlet; the flexible shielding assembly is used to shield the gap between the copper nozzle assembly and the laser outlet.

[0007] Further, the copper nozzle assembly includes at least one copper nozzle body; the copper nozzle body includes a laser channel, a laser inlet end and a laser outlet end; the laser inlet end and the laser outlet end are arranged at both ends of the laser channel; the laser inlet end is slidably fitted on the laser outlet.

[0008] Further, the copper nozzle assembly includes two copper nozzle bodies; the flexible shielding assembly includes a first flexible shielding unit, a second flexible shielding unit and a third flexible shielding unit; the laser outlet side of the fixed seat, the first flexible shielding unit, one copper nozzle body, the second flexible shielding unit, the other copper nozzle body, the third flexible shielding unit, and the other side of the laser outlet of the fixed seat are connected in sequence.

[0009] Further, the copper nozzle body further includes a protection air hole; the protection air hole communicates with the laser channel.

[0010] Further, the laser inlet end is provided with a sliding part; the laser outlet of the fixed seat is provided with a guiding part; the sliding part and the guiding part are slidably fitted; a screw is provided on the laser inlet end for locking the sliding part and the guiding part.

[0011] Further, the fixed seat further includes a cavity, a laser inlet and a vacuum pumping hole communicating with the cavity; the laser inlet and the laser outlet are arranged at both ends of the cavity.

[0012] Further, a first air knife is arranged on the inner wall of the cavity; the height of the first air knife is located between the vacuum pumping hole and the laser inlet; the first air knife is used to blow air obliquely into the cavity to prevent impurities from going out through the laser inlet.

[0013] Further, a second air knife is arranged on the inner wall of the cavity; the height of the second air knife is located between the first air knife and the laser inlet; the second air knife is used to blow air obliquely into the cavity to prevent impurities from going out through the laser inlet.

[0014] Further, the fixed seat further includes an air inlet; the air inlet is used to supply air to the first air knife and / or the second air knife.

[0015] Further, the first air knife and / or the second air knife extend along the length direction of the laser outlet.

[0016] Further, the flexible shielding component is a corrugated plastic sheet.

[0017] A laser welding system includes a laser unit and the above-mentioned laser welding device; the laser unit is used to provide laser for the laser welding device.

[0018] The beneficial effects of the present utility model are:

[0019] The present utility model discloses a laser welding device and system, including a copper nozzle assembly, a fixed seat, and a flexible shielding component; the fixed seat includes a laser outlet; the copper nozzle assembly is slidably fitted on the laser outlet; the flexible shielding component is used to shield the gap between the copper nozzle assembly and the laser outlet. The laser welding device of the present utility model realizes the adjustment of the copper nozzle spacing, shortens the path of the shielding gas to the welding point, prevents the welding slag from splashing everywhere, thereby improving the flexibility, shielding effect, and overall welding quality of the copper nozzle welding device. Description of the Drawings

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the copper nozzle body of the present utility model;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of another perspective of the copper nozzle body of the present utility model;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the laser welding device of the present utility model;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of another perspective of the laser welding device of the present utility model;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of another perspective of the laser welding device of the present utility model;

[0025] Figure 6 It is a three-dimensional structural schematic diagram of another perspective of the laser welding device of the present utility model;

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the laser welding device of the present utility model, with some copper nozzle components and flexible shielding parts omitted;

[0027] In the accompanying drawings: 1 - copper nozzle assembly, 11 - copper nozzle body, 111 - laser channel, 112 - laser inlet end, 113 - laser outlet end, 114 - protection air hole, 115 - sliding part, 116 - slider, 117 - first long hole, 2 - fixed seat, 21 - laser outlet, 22 - guiding part, 24 - laser inlet, 25 - vacuum extraction hole, 23 - cavity, 221 - guiding groove, 222 - second long hole, 231 - first air knife, 232 - second air knife, 233 - air inlet, 3 - flexible shielding assembly, 31 - first flexible shielding unit, 32 - second flexible shielding unit, 33 - third flexible shielding unit, 4 - threaded hole. Detailed implementation manners

[0028] The following further describes the present utility model in detail in conjunction with the accompanying drawings and specific implementation manners, but the present utility model is not limited to the following embodiments.

[0029] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification (including any additional claims, abstract) can be replaced by other equivalent or similar-purpose alternative features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only an example of a series of equivalent or similar features.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing 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 should not be construed as a limitation to the present utility model.

[0032] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0033] Embodiment 1:

[0034] See the appendix Figures 1 - 2, which shows the specific structure of the copper nozzle body 11. One end of the copper nozzle body 11 is the laser inlet end 112, and the other end is the laser outlet end 113. The laser outlet end 113 is the welding point, and between the laser inlet end 112 and the laser outlet end 113 is the laser channel 111. The laser outlet end 113 of the copper nozzle body 11 can be set to be conical, and the end with the smaller cross-sectional area of the cone is the outlet of the laser. A sealing plate with a long strip hole can be provided at the outlet, so that the laser is focused and emitted from the long strip hole, improving the laser welding power.

[0035] Specifically, a protective air hole 114 is opened on the side surface of the copper nozzle body 11. The protective air hole 114 communicates with the laser channel 111. The protective gas enters the laser channel 111 from the protective air hole 114 and is emitted from the laser outlet end 113 to reach the welding point, isolating oxygen and moisture in the air and playing a protective role for the welded object. In this application, the protective air hole 114 is arranged on the copper nozzle body 11, shortening the distance of the protective gas to the welding point, improving the protection effect, and thus improving the overall welding quality.

[0036] Embodiment 2:

[0037] See appendix Figures 3 - 6 , which shows the specific structure of the laser welding device from various perspectives. The laser welding device includes a copper nozzle assembly 1, a fixed seat 2 and a flexible shielding assembly 3. The copper nozzle assembly 1 includes at least one copper nozzle body 11 of Embodiment 1. The fixed seat 2 includes a laser outlet 21. The laser inlet end 112 of the copper nozzle body 11 is slidably fitted on the laser outlet 21 of the fixed seat 2. A flexible shielding member is also provided on the laser outlet 21 of the fixed seat 2. The flexible shielding assembly 3 can be a continuous corrugated plastic sheet, which can be compressed, folded or stretched. The flexible shielding member is located at other positions on the laser outlet 21 outside the copper nozzle body 11, and is used to shield other gaps outside the copper nozzle body 11 on the laser outlet 21. When the copper nozzle body 11 slides at the laser inlet end 112, the flexible shielding member is compressed or stretched as the copper nozzle body 11 slides, shielding other gaps outside the copper nozzle body 11 on the laser outlet 21, so that the laser can only be emitted from the laser outlet end 113 of the copper nozzle body 11 after passing through the fixed seat 2.

[0038] Specifically, the copper nozzle assembly 1 includes two copper nozzle bodies 11. When there are two copper nozzle bodies 11, the flexible shielding assembly 3 is divided into three parts, namely the first flexible shielding unit 31, the second flexible shielding unit 32, and the third flexible shielding unit 33. The laser exit 21 side of the fixed seat 2, the first flexible shielding unit 31, one copper nozzle body 11, the second flexible shielding unit 32, the other copper nozzle body 11, the third flexible shielding unit 33, and the other side of the laser exit 21 of the fixed seat 2 are connected in sequence. When it is necessary to adjust the distance between the two copper nozzle bodies 11 to be smaller, move one copper nozzle body 11 closer to the other copper nozzle body 11, and the second flexible shielding unit 32 located between the two copper nozzle bodies 11 will be compressed, and the first flexible shielding unit 31 or the third flexible shielding unit 33 between the moving copper nozzle body 11 and the laser exit 21 side will be stretched; when it is necessary to adjust the distance between the two copper nozzle bodies 11 to be smaller, move one copper nozzle body 11 away from the other copper nozzle body 11, and the second flexible shielding unit 32 located between the two copper nozzle bodies 11 will be stretched, and the first flexible shielding unit 31 or the third flexible shielding unit 33 between the moving copper nozzle body 11 and the laser exit 21 side will be compressed. Thus, it can be seen that the distance between the two copper nozzle bodies 11 of the laser welding device of the present application can be adjusted to weld the tabs of different models of batteries, compatible with multiple models of batteries, without replacing the entire device, improving production efficiency and the flexibility of the device. It should be understood that one copper nozzle body 11 can also be provided on the laser exit 21 of the copper nozzle body 11. If only one copper nozzle body 11 is provided, the first flexible shielding unit 31 and the third flexible shielding unit 33 are respectively provided on both sides of the copper nozzle body 11. When welding the tabs, two weldings need to be carried out respectively. After one side of the tab is welded, the copper nozzle body 11 can be directly adjusted on the fixed seat 2 without replacing the entire device.

[0039] Specifically, a sliding portion 115 is provided at the laser inlet end 112, and a guiding portion 22 is provided on the laser outlet 21 of the fixing base 2. The sliding portion 115 and the guiding portion 22 are in sliding fit, and a screw for locking the sliding portion 115 and the guiding portion 22 is provided on the laser inlet end 112. Among them, the guiding portion 22 can be a guiding groove 221, and the guiding groove 221 is arranged on one side of the laser outlet 21 along the length direction of the fixing base 2. The sliding portion 115 can be a slider 116 that cooperates with the guiding groove 221. The sliders 116 are arranged on both sides of the laser inlet end 112 of the copper nozzle body 11. Insert one side of the slider 116 into the guiding groove 221, and the copper nozzle body 11 slides along with the slider 116 sliding in the guiding groove 221. Further, a first long hole 117 is provided on the slider 116 on the other side, and a plurality of threaded holes 4 are arranged along the length direction on the side wall of the fixing base 2 below the first long hole 117. When the copper nozzle body 11 is adjusted to a rough position, the screw is passed through the first long hole 117 and screwed into the threaded hole 4 below. At this time, the bolt does not completely enter the threaded hole 4, and the copper nozzle body 11 is preliminarily positioned. Then, the copper nozzle body 11 is finely adjusted. After adjusting to the accurate position, the bolt is completely screwed into the threaded hole 4. The size of the first long hole 117 is smaller than the flange surface of the bolt. At this time, the flange surface of the bolt presses the copper nozzle body 11 against the fixing base 2, and the copper nozzle body 11 is fixed on the fixing base 2. Further, a second long hole 222 is opened along the length direction on the side wall of the guiding groove 221, as shown in Figure 3 the attached figure shows the specific structure of the guiding groove 221. A threaded hole 4 is provided on the slider 116 below the second long hole 222, and a plurality of threaded holes 4 are arranged along the length direction on the side wall of the fixing base 2 in contact with the slider 116. When the copper nozzle body 11 is adjusted to the accurate position, the screw is passed through the second long hole 222, screwed into the threaded hole 4 on the corresponding slider 116, and screwed into the threaded hole 4 on the corresponding side wall of the fixing base 2 to further fix the copper nozzle body 11.

[0040] Specifically, the fixing base 2 further includes a cavity 23 and a laser inlet 24. One end of the fixing base 2 is the laser inlet 24, and the other end is also the laser inlet 24. The cavity 23 is between the two laser inlets 24. A vacuum extraction hole 25 communicating with it is provided on the side wall of the cavity 23, and vacuum is extracted into the cavity 23 through a vacuum tube to suck away the welding slag generated during welding.

[0041] Specifically, a first air knife 231 is provided on the side wall of the cavity 23. The first air knife 231 extends along the length direction of the laser outlet 21 and is located between the vacuum hole 25 and the laser inlet 24. The first air knife 231 is used to blow air obliquely into the cavity 23 to form a first air wall between two opposite side walls of the cavity 23, thereby preventing impurities from splashing outwards from the laser inlet 24. A second air knife 232 is provided on another side wall of the cavity 23. The second air knife 232 is opposite to the first air knife 231, and its height is higher than that of the second air knife 232 and lower than that of the laser inlet 24. The second air knife 232 is used to blow air obliquely into the cavity 23 to form a second air wall continuous with the first air wall. In this way, a continuous air wall will be formed between the two side walls, forming multiple barriers to improve the blocking effect. An air inlet 233 is further provided on the side wall of the fixing seat 2. The air inlet 233 is in air supply communication with the first air knife 231 and / or the second air knife 232, and air is blown into the first air knife 231 or the second air knife 232 through the air inlet 233.

[0042] Embodiment Three:

[0043] A laser welding system includes a laser unit and the laser welding device of Embodiment Two. The laser unit is used to provide laser for the laser welding device. The laser is emitted from the laser unit, enters the laser welding device, and is emitted from the laser outlet end 113 of the laser device to weld the tab of the welding point on the top cover.

[0044] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A laser welding device, characterized in that: It includes a copper nozzle assembly (1), a fixed seat (2), and a flexible shielding assembly (3); the fixed seat (2) includes a laser outlet (21); the copper nozzle assembly (1) is slidably fitted on the laser outlet (21); the flexible shielding assembly (3) is used to shield the gap between the copper nozzle assembly (1) and the laser outlet (21); the copper nozzle assembly (1) includes at least one copper nozzle body (11); the copper nozzle body (11) includes a laser channel (111), a laser inlet end (112), and a laser outlet end (113); the laser inlet end (112) and the laser outlet end (113) are arranged at both ends of the laser channel (111); the laser inlet end (112) is slidably fitted on the laser outlet (21).

2. The laser welding device according to claim 1, characterized in that: The flexible shielding assembly (3) includes a first flexible shielding unit (31), a second flexible shielding unit (32), and a third flexible shielding unit (33); on one side of the laser outlet (21) of the fixed seat (2), the first flexible shielding unit (31), one copper nozzle body (11), the second flexible shielding unit (32), another copper nozzle body (11), the third flexible shielding unit (33), and the other side of the laser outlet (21) of the fixed seat (2) are connected in sequence.

3. The laser welding device according to claim 2, wherein: The copper nozzle body (11) further includes a protection air hole (114); the protection air hole (114) communicates with the laser channel (111).

4. A laser welding device according to claim 2, characterized in that: The laser inlet end (112) is provided with a sliding part (115); the laser outlet (21) of the fixed seat (2) is provided with a guiding part (22); the sliding part (115) and the guiding part (22) are slidably fitted; a screw for locking the sliding part (115) and the guiding part (22) is provided on the laser inlet end (112).

5. A laser welding device according to claim 1, characterized in that: The fixed seat (2) further includes a cavity (23), a laser inlet (24), and a vacuum pumping hole (25) communicating with the cavity (23); the cavity (23) is provided with a laser inlet (24) and a laser outlet (21) at both ends.

6. The laser welding device according to claim 5, characterized in that: The inner wall of the cavity (23) is provided with a first air knife (231); the height of the first air knife (231) is located between the vacuum pumping hole (25) and the laser inlet (24); the first air knife (231) is used to blow air obliquely into the cavity (23) to prevent impurities from going out through the laser inlet (24).

7. A laser welding device according to claim 6, characterized in that: The inner wall of the cavity (23) is provided with a second air knife (232); the height of the second air knife (232) is located between the first air knife (231) and the laser inlet (24); the second air knife (232) is used to blow air obliquely into the cavity (23) to prevent impurities from going out through the laser inlet (24).

8. A laser welding device according to claim 7, characterized in that: The fixed seat (2) further includes an air inlet (233); the air inlet (233) is used to supply air to the first air knife (231) and / or the second air knife (232); the first air knife (231) and / or the second air knife (232) extends along the length direction of the laser outlet (21).

9. A laser welding device according to claim 1, wherein: The flexible shielding assembly (3) is a corrugated plastic sheet.

10. A laser welding system, characterized in that: It includes a laser unit and a laser welding device as described in any one of claims 1 to 9; the laser unit is used to provide laser for the laser welding device.

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