Nanosecond laser welding device for ultrathin copper sheet and aluminum sheet of battery

Abstract

The utility model discloses a nanosecond laser welding device for an ultrathin copper sheet and an aluminum sheet of a battery, which relates to the technical field of laser welding and comprises a workbench and a nanosecond laser welding component. According to the nanosecond laser welding device for the ultrathin copper sheet and the aluminum sheet of the battery, through the arrangement of the nanosecond laser welding assembly, the ultraviolet nanosecond laser emits the laser beams, the laser beams are expanded through the beam expander to form uniform parallel beams, the parallel beams enter the scanning galvanometer, and the scanning galvanometer is used for scanning the ultrathin copper sheet and the aluminum sheet of the battery. The scanning galvanometer comprises an X galvanometer and a Y galvanometer which are sequentially arranged on a light path in the scanning galvanometer and can be used for changing the emitting direction of laser, parallel light beams emitted by the scanning galvanometer are projected to the position below the focusing field lens after being focused by the focusing field lens, and in the advancing process of a laser spot, the laser firstly removes foil on the upper layer of a to-be-welded material, and then the foil on the upper layer of the to-be-welded material is removed. And then a sheet on the lower layer of the to-be-welded material is subjected to hot melting, molten slurry of the sheet on the lower layer rolls up to be molten with the foil on the upper layer, and fusion welding is achieved after cooling.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding, in particular to a nanosecond laser welding device for ultra-thin copper sheets and aluminum sheets of batteries. Background Art

[0002] In the battery industry, consumer electronics industry, etc., a metal foil welding process is involved. Thin sheet metal welding technology is a technology that fuses two or more thin sheet metals together.

[0003] In the traditional welding process, ultrasonic welding is mainly used. The disadvantage of this method is that the welding head is subject to wear and the wear time is uncontrollable. Once wear occurs, the welding quality will drop significantly, resulting in many defective products. On the other hand, traditional ultrasonic welding will squeeze the product. After the welding is completed, the product will stretch and form a pull, which can easily tear the isolation film, causing a short circuit explosion.

[0004] Therefore, in view of this, the existing structural deficiencies are studied and improved, and a nanosecond laser welding device for ultra-thin copper and aluminum sheets of batteries is proposed. Utility Model Content

[0005] The utility model aims to provide a nanosecond laser welding device for ultra-thin copper sheets and aluminum sheets of batteries, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nanosecond laser welding device for an ultra-thin copper sheet and an aluminum sheet of a battery, comprising a workbench and a nanosecond laser welding assembly, wherein a nanosecond laser welding assembly is arranged on one side of the workbench, and the nanosecond laser welding assembly comprises an ultraviolet nanosecond laser, a beam expander, a scanning galvanometer and a focusing field lens, wherein the front end of the ultraviolet nanosecond laser is connected to a beam expander, and the front end of the beam expander is connected to a scanning galvanometer, and the scanning galvanometer contains an X galvanometer and a Y galvanometer arranged sequentially on the optical path inside the scanning galvanometer, and the bottom end of the scanning galvanometer is connected to a focusing field lens.

[0007] Furthermore, a cam divider is fixed with bolts at the bottom of the workbench, and a turntable is fixedly connected to the top output end of the cam divider.

[0008] Furthermore, four welding seats are distributed in a circular array around the circumference of the turntable, and a positioning groove with an open end is provided in the middle of the welding seat.

[0009] Furthermore, a cylinder is arranged inside the turntable, and a fitting fixture matching the positioning groove is fixedly connected to the output end of the cylinder.

[0010] Furthermore, a power supply is provided on one side of the workbench, and the power supply is electrically connected to the ultraviolet nanosecond laser through a power supply harness.

[0011] Furthermore, a column is fixed on the other side of the workbench, and a sliding groove is opened on the side of the column.

[0012] Furthermore, a motor is bolted to the top of the column, a lead screw is fixedly connected to the output end of the motor, and a sliding seat is threadedly connected to the middle of the lead screw.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. When the utility model is in use, the stacked foils and sheets are placed in the positioning grooves in the welding seat. Under the drive of the cam divider on the turntable, the welding materials are accurately sent to the laser welding station to realize the automatic conveying and processing of the materials. Then, the cylinder arranged on the side of the turntable aligns the fitting jig with the positioning groove and presses it down, so that the foil and the sheet are tightly fitted together without manual pressing, thereby improving the degree of automation. When in use, the nanosecond laser welding assembly is fixed to the inner side of the slide seat by bolts, and is connected to the power supply through the power supply harness to establish energy supply. The slide seat slides in the inner groove of the column and cooperates with the lead screw thread at the output end of the motor. The position of the nanosecond laser welding assembly can be fine-tuned during use, and the operation is simpler.

[0015] 2. The utility model uses the arrangement of a nanosecond laser welding assembly, wherein an ultraviolet nanosecond laser emits a laser beam, which is expanded by a beam expander to form a uniform parallel beam, and the parallel beam enters a scanning galvanometer, which contains an X galvanometer and a Y galvanometer sequentially arranged on an optical path therein, and can be used to change the emission direction of the laser. The parallel beam emitted by the scanning galvanometer is focused by a focusing field lens and then projected under the focusing field lens. During the movement of the laser spot, the laser first removes the foil on the upper layer of the material to be welded, and then heat-melts the sheet on the lower layer of the material to be welded, so that the molten slurry of the lower sheet rolls up and melts together with the foil on the upper layer, and melt welding is achieved after cooling. During welding, the heat-affected zone formed by the laser is smaller than that of traditional laser welding methods, and the strength change and brittleness change of the material will also be smaller, thereby greatly improving the conductivity of the battery electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall external structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the external structure of the nanosecond laser welding assembly of the utility model;

[0018] Figure 3 It is a schematic diagram of the external structure of the laminating fixture of the utility model.

[0019] In the figure: 1. workbench; 2. cam divider; 3. turntable; 4. welding seat; 5. positioning groove; 6. cylinder; 7. bonding fixture; 8. power supply; 9. power supply harness; 10. column; 11. slide; 12. motor; 13. lead screw; 14. slide; 15. nanosecond laser welding assembly; 1501. laser; 1502. beam expander; 1503. scanning galvanometer; 1504. focusing field lens. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0021] like Figure 1 to Figure 2 As shown, the nanosecond laser welding device for the ultra-thin copper sheet and the aluminum sheet of the battery comprises a workbench 1 and a nanosecond laser welding assembly 15. The nanosecond laser welding assembly 15 is arranged on one side of the workbench 1. The nanosecond laser welding assembly 15 comprises an ultraviolet nanosecond laser 1501, a beam expander 1502, a scanning galvanometer 1503 and a focusing field lens 1504. The front end of the ultraviolet nanosecond laser 1501 is connected to the beam expander 1502, and the front end of the beam expander 1502 is connected to the scanning galvanometer 1503, and the scanning galvanometer 1503 contains an X galvanometer and a Y galvanometer arranged in sequence on the optical path inside the scanning galvanometer 1503. The bottom end of the scanning galvanometer 1503 is connected to the focusing field lens 1504. The ultraviolet nanosecond laser 1501 emits a laser beam, and the laser beam is expanded by the beam expander to form a uniform Parallel light beam, the parallel light beam enters the scanning galvanometer 1503, the scanning galvanometer 1503 contains an X galvanometer and a Y galvanometer sequentially arranged on the optical path inside it, which can be used to change the emission direction of the laser. The parallel light beam emitted by the scanning galvanometer 1503 is focused by the focusing field lens 1504 and then projected under the focusing field lens 1504. During the movement of the laser light spot, the laser first removes the foil material on the upper layer of the material to be welded, and then heat-melts the sheet material on the lower layer of the material to be welded, so that the molten slurry of the lower layer of the sheet material rolls up and melts together with the foil material on the upper layer, and melt welding is achieved after cooling. During welding, the heat-affected zone formed by the laser is smaller than that of the traditional laser welding method, and the strength change and brittleness change of the material will also be smaller, which greatly improves the conductivity of the battery electrode;

[0022] like Figures 1 to 3As shown, a cam divider 2 is bolted to the bottom of the workbench 1, and a turntable 3 is fixedly connected to the top output end of the cam divider 2. Four welding seats 4 are distributed in a circular array around the turntable 3, and a positioning groove 5 with an open end is provided in the middle of the welding seat 4. A cylinder 6 is arranged on the inner side of the turntable 3, and a fitting fixture 7 matched with the positioning groove 5 is fixedly connected to the output end of the cylinder 6. The stacked foil and sheet materials are placed in the positioning groove 5 in the welding seat 4. Under the drive of the cam divider 2 on the turntable 3, the welding materials are accurately sent to the laser welding station to realize the automatic conveying and processing of the materials. Then, the cylinder 6 arranged on the side of the turntable 3 aligns the fitting fixture 7 with the positioning groove 5 and presses it down, so that the foil and sheet materials are tightly fitted together without manual pressing, which improves the quality of the material. To improve the degree of automation, a power supply 8 is arranged on one side of the workbench 1, and the power supply 8 is electrically connected to the ultraviolet nanosecond laser 1501 through a power supply harness 9, a column 10 is fixed on the other side of the workbench 1, and a slide groove 11 is opened on the side of the column 10, a motor 12 is bolted to the top of the column 10, and a lead screw 13 is fixedly connected to the output end of the motor 12, and a slide seat 14 is threadedly connected to the middle part of the lead screw 13, a nanosecond laser welding component 15 is fixed to the inner side of the slide seat 14 by bolts, and is connected to the power supply 8 through the power supply harness 9 to establish energy supply, the slide seat 14 slides in the slide groove 11 inside the column 10, and is threadedly matched with the lead screw 13 at the output end of the motor 12, so that the position of the nanosecond laser welding component 15 can be fine-tuned during use, and the operation is easier.

[0023] Working principle: When using the nanosecond laser welding device for ultra-thin copper and aluminum sheets of the battery, put the foil and sheet stacked up and down into the positioning groove 5 in the welding seat 4. Under the drive of the cam divider 2 to the turntable 3, the welding material is accurately sent to the laser welding station to realize the automatic conveying and processing of the material. Then, the cylinder 6 set on the side of the turntable 3 aligns the fitting fixture 7 with the positioning groove 5 and presses it down, so that the foil and sheet are tightly fitted together without manual pressing, thereby improving the degree of automation. When in use, the nanosecond laser welding component 15 is fixed to the inner side of the slide 14 by bolts, and is connected to the power supply 8 through the power supply harness 9 to establish energy supply. The slide 14 slides in the inner groove 11 of the column 10 and cooperates with the screw 13 at the output end of the motor 12. The position of the nanosecond laser welding component 15 can be fine-tuned during use, which makes the operation easier. Ultraviolet nanosecond laser 1501 emits a laser beam, which is expanded by a beam expander to form a uniform parallel beam. The parallel beam enters the scanning galvanometer 1503. The scanning galvanometer 1503 contains an X galvanometer and a Y galvanometer arranged in sequence on the optical path inside it, which can be used to change the emission direction of the laser. The parallel beam emitted by the scanning galvanometer 1503 is focused by the focusing field lens 1504 and projected under the focusing field lens 1504. During the movement of the laser light spot, the laser first removes the foil on the upper layer of the material to be welded, and then heat-melts the sheet on the lower layer of the material to be welded, so that the molten slurry of the lower sheet rolls up and melts together with the foil on the upper layer. After cooling, molten welding is achieved. During welding, the heat-affected zone formed by the laser is smaller than that of traditional laser welding methods, and the strength change and brittleness change of the material will also be smaller, which greatly improves the conductivity of the battery electrode.

[0024] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. Nanosecond laser welding device for ultra-thin copper sheet and aluminum sheet of battery, characterized in that: The invention comprises a workbench (1) and a nanosecond laser welding assembly (15), wherein a cam divider (2) is fixedly bolted to the bottom of the workbench (1), and a turntable (3) is fixedly connected to the top output end of the cam divider (2), and the turntable (3) is provided with four welding seats (4) distributed in a circular annular array, and a positioning groove (5) with an open end is provided in the middle of the welding seat (4), a cylinder (6) is arranged on the inner side of the turntable (3), and a fitting jig (7) matching the positioning groove (5) is fixedly connected to the output end of the cylinder (6), and a nanosecond laser welding jig (7) is arranged on one side of the workbench (1). The invention relates to a connecting component (15), wherein the nanosecond laser welding component (15) comprises an ultraviolet nanosecond laser (1501), a beam expander (1502), a scanning galvanometer (1503) and a focusing field lens (1504), wherein the front end of the ultraviolet nanosecond laser (1501) is connected to the beam expander (1502), and the front end of the beam expander (1502) is connected to the scanning galvanometer (1503), and the scanning galvanometer (1503) contains an X galvanometer and a Y galvanometer which are sequentially arranged on the optical path inside the scanning galvanometer (1503), and the bottom end of the scanning galvanometer (1503) is connected to the focusing field lens (1504).

2. The nanosecond laser welding device for ultra-thin copper sheet and aluminum sheet of a battery according to claim 1 is characterized in that: A power supply (8) is provided on one side of the workbench (1), and the power supply (8) is electrically connected to the ultraviolet nanosecond laser (1501) via a power supply harness (9).

3. The nanosecond laser welding device for ultra-thin copper sheet and aluminum sheet of a battery according to claim 1 is characterized in that: A column (10) is fixed on the other side of the workbench (1), and a sliding groove (11) is provided on the side of the column (10).

4. The nanosecond laser welding device for ultra-thin copper sheet and aluminum sheet of a battery according to claim 3 is characterized in that: The top of the column (10) is bolted with a motor (12), the output end of the motor (12) is fixedly connected with a screw rod (13), and the middle part of the screw rod (13) is threadedly connected with a slide seat (14).

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