A cylindrical power lithium battery cap laser welding machine

Abstract

The present application relates to the technical field of battery cap manufacturing equipment, and discloses a cylindrical power lithium battery cap laser welding machine, including a clamping member, which is connected to a driving cylinder through a connecting arm, and the clamping member includes a clamping cylinder fixedly connected to the connecting arm, and the inner wall of the clamping cylinder near the upper and lower ends is connected to a connecting seat through a connecting rod, and one side of the connecting seat is connected to an expansion bladder, which is coaxial with the clamping cylinder, and is completely located in the welding line when the expansion bladder is in a contracted state, and can contact the inner wall of the clamping cylinder when the expansion state. The cylindrical power lithium battery cap laser welding machine uses the expansion of the expansion bladder to seal the end of the clamping cylinder, and the clamping cylinder is filled with protective gas. When the clamping cylinder presses the cap assembly, the expansion bladder contracts, and an upward or downward protective gas flow is formed in the clamping cylinder, isolating the air and will not change the cap position. At the same time, the time consumed to evacuate the air and the gas flow is short, thereby improving the welding efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of battery cap manufacturing equipment, and in particular to a cylindrical power lithium battery cap laser welding machine. Background Art

[0002] Laser welding is a process in cap production, used to fix large and small aluminum sheets or to fix steel caps to large and small aluminum sheets. Generally speaking, when laser welding is carried out, the weldment needs to be placed in a protective gas environment to ensure the welding effect.

[0003] In the prior art, the method of directly blowing inert gas through an open hole is usually adopted to isolate the air. However, if the airflow is too large, it is easy to blow the cap and change its position, thereby reducing the welding quality. If the gas is introduced after the cap is pressed, it will take a certain amount of time for the inert gas to flow and exhaust the air, which will extend the welding waiting time, reduce welding efficiency, and further reduce the cap production efficiency.

[0004] On the other hand, if the inert gas is continuously blown to the welding point, the consumption of the inert gas will increase, which will increase the production cost. Summary of the invention

[0005] The present application proposes a cylindrical power lithium battery cap laser welding machine, which has strong gas flow only after the cap is pressed by a tight cylinder, and will not change the position of the cap. At the same time, the time taken to evacuate the air and the gas flow is short, which reduces nitrogen consumption and improves welding efficiency.

[0006] To achieve the above purpose, the present application adopts the following technical solution: a cylindrical power lithium battery cap laser welding machine, comprising:

[0007] A material distribution plate, wherein the material distribution plate is provided with an accompanying clamp;

[0008] A laser welding head, which is mounted on a column on one side of the material distribution tray;

[0009] A clamping piece, wherein the clamping piece is arranged directly below the laser welding head, the clamping piece is connected to a driving cylinder via a connecting arm, the driving cylinder is arranged at one side of the material distribution plate, the driving cylinder drives the clamping piece to move up and down, the clamping piece comprises a clamping cylinder fixedly connected to the connecting arm, the inner wall of the clamping cylinder near the upper and lower ends are connected to a connecting seat via a connecting rod, one side of the connecting seat is connected to an expansion bag, the expansion bag is coaxial with the clamping cylinder, the expansion bag is completely located in the welding line in a contracted state, and can contact with the inner wall of the clamping cylinder in an expanded state, the side wall of the clamping cylinder is provided with an air inlet pipe, the air inlet pipe introduces inert gas into the clamping cylinder, the expansion bag contracts when the clamping cylinder contacts the cap, and expands after the welding is completed;

[0010] A lower air suction head is arranged below the lower expansion bag, the lower air suction head is connected with an external air extraction device through an air suction pipe, and an air inlet hole is arranged on the side of the lower air suction head.

[0011] Furthermore, an upper suction head is provided on the outside of the upper expansion bag, and a guide plate is fixedly connected to the top of the upper suction head. A suction space is formed between the guide plate and the expansion bag, and the upper suction head is connected to an external suction device through a suction pipe.

[0012] Furthermore, the expansion bag is arranged on the outward side of the connecting seat, the inward side of the connecting seat is provided with an extrusion bag, the sides of the two extrusion bags facing each other are provided with extrusion plates, and an extrusion cylinder is provided between the two extrusion plates. The extrusion cylinder is connected to an external high-pressure gas source through a high-pressure gas pipe. When welding is completed, the extrusion cylinder is connected to the high-pressure gas through the high-pressure gas pipe. When the clamping piece contacts the cap assembly, the gas is discharged through the high-pressure gas pipe.

[0013] Furthermore, a clamping ring is provided at the bottom of the clamping cylinder, and the diameter of the clamping ring is larger than the diameter of the welding wire.

[0014] Furthermore, the outward side of the expansion bladder is configured as a conical surface.

[0015] Furthermore, the expansion bag includes a base fixedly connected to the connecting seat, the base is covered with an outer bag without elasticity, and a plurality of groups of radially arranged elastic sheets are provided between the outer bag and the base.

[0016] Furthermore, a movable sleeve is provided on the inner side of the compression cylinder, the compression cylinder is connected to the connecting rod via the movable sleeve, the movable sleeve and the connecting rod are fixedly connected, and the movable sleeve can rotate.

[0017] Furthermore, a magnet is embedded on one side of the movable sleeve, and an electromagnet is provided on the outer side of the clamping cylinder. When no power is supplied, the magnet and the electromagnet attract each other. When welding starts, the electromagnet is energized, and the movable sleeve rotates a certain angle in the welding direction under the repulsive force.

[0018] Beneficial effects of the present invention:

[0019] The present application provides a cylindrical power lithium battery cap laser welding machine, which utilizes the expansion of an expansion bag to seal the end of a pressing cylinder. The pressing cylinder is filled with a protective gas. When the pressing cylinder presses the cap assembly, the expansion bag contracts, and an upward or downward protective gas flow is formed in the pressing cylinder to isolate the air. On the one hand, there is a strong gas flow only after the cap is pressed, and the position of the cap will not be changed. On the other hand, the time consumed to evacuate the air and the gas flow is shorter, thereby improving the welding efficiency.

[0020] Secondly, in this process, the flow rate of nitrogen is slow, and the overall nitrogen consumption is low. At the same time, the upper suction head is used to absorb the exhaust gas, which can absorb the exhaust gas before it diffuses, and the exhaust gas absorption efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles of the embodiments disclosed in the present application.

[0022] The embodiments disclosed in the present application may be more clearly understood according to the following detailed description with reference to the accompanying drawings, in which:

[0023] Figure 1 is a schematic diagram of a pressing member in the present invention;

[0024] Figure 2 For the present invention Figure 1 A front view of

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 4 is a schematic diagram of an expansion bladder in the present invention;

[0027] Figure 5 It is a top view of the pressing member in the present invention.

[0028] In the figure: 1. material distribution plate; 2. accompanying clamp; 3. column; 4. laser welding head; 5. connecting arm; 6. driving cylinder; 7. pressing piece; 701. pressing cylinder; 702. connecting rod; 703. connecting seat; 704. expansion bag; 7041. base; 7042. connecting pipe; 7043. outer bag; 7044. elastic sheet; 705. extrusion bag; 706. extrusion plate; 707. extrusion cylinder; 708. high-pressure air pipe; 709. lower suction head; 710. upper suction head; 711. guide plate; 712. suction pipe; 713. intake pipe; 714. movable sleeve; 715. clamping ring; 716. magnet; 717. electromagnet; 718. movable groove. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Embodiment 1

[0031] See also Figure 1-Figure 3A cylindrical power lithium battery cap laser welding machine comprises a material distribution plate 1, on which a traveling fixture 2 is provided, a feeding assembly places a corresponding cap assembly on the traveling fixture 2, and the material distribution plate 1 rotates intermittently so that the traveling fixture 2 reaches the welding station in sequence, a laser welding head 4 is provided on one side of the material distribution plate 1, and the laser welding head 4 is mounted on a column 3, and the column 3 stands on one side of the material distribution plate 1, and the traveling fixture 2 can move to the bottom of the laser welding head 4, and a clamping piece 7 is provided below the laser welding head 4, and the clamping piece 7 is connected to the driving cylinder 6 through a connecting arm 5, and the driving cylinder 6 stands on one side of the material distribution plate 1, and the driving cylinder 6 drives the clamping piece 7 to move up and down.

[0032] The pressing member 7 includes a pressing cylinder 701 fixedly connected to the connecting arm 5. The inner wall of the pressing cylinder 701 near the upper and lower ends is connected to a connecting seat 703 through a connecting rod 702. One side of the connecting seat 703 is connected to an expansion capsule 704. The expansion capsule 704 is coaxial with the pressing cylinder 701. When the expansion capsule 704 is in a contracted state, it is completely located in the welding line. When it is in an expanded state, it can contact the inner wall of the pressing cylinder 701. That is, in a natural state, the diameter of the expansion capsule 704 is smaller than the welding diameter. After expansion, the diameter of the expansion capsule 704 is larger than the pressing cylinder 70 1, the expansion bag 704 is always coaxial with the welding line and the pressing cylinder 701. When the two expansion bags 704 are expanded, a relatively closed space is formed in the pressing cylinder 701. The purpose of the closure is to reduce the amount of nitrogen used. There may be leakage between the expansion bag 704 and the pressing cylinder 701. The side wall of the pressing cylinder 701 is provided with an air inlet pipe 713. The air inlet pipe 713 introduces inert gas into the pressing cylinder 701. In this embodiment, the inert gas is nitrogen. The expansion bag 704 shrinks when the pressing cylinder 701 contacts the cap, and expands after the welding is completed.

[0033] A lower air suction head 709 is provided below the lower expansion bag 704, and the lower air suction head 709 is connected to an external vacuum device through an air suction pipe 712. An air inlet hole is provided on the side of the lower air suction head 709, and the vacuum device is always kept open. The lower air suction head 709 can extract the air blocked between the expansion bag 704 and the cap.

[0034] During welding, the accompanying fixture 2 rotates to the bottom of the laser welding head 4, and the driving cylinder 6 drives the pressing piece 7 to move downward, and the bottom of the pressing cylinder 701 is pressed against the cap assembly. At the same time, the upper and lower expansion bags 704 shrink, and part of the nitrogen enclosed in the pressing cylinder 701 flows upward, and the other part of the nitrogen flows to the bottom under the suction of the lower suction head 709. At the same time, the suction head 709 completely extracts the air blocked at the bottom of the pressing piece 7 during the downward pressing process, so that the cap is completely filled with nitrogen. Surrounded, the laser welding head 4 is started, and the laser moves around the outside of the expansion bag 704. After welding is completed, the expansion bag 704 expands to seal the upper and lower ends of the compression cylinder 701. At the same time, the compression piece 7 moves upward and leaves the cap. At this time, the nitrogen continues to flow into the suction pipe 712, and only part of the nitrogen flows out from between the expansion bag 704 and the compression cylinder 701, reducing the consumption of nitrogen. At the same time, the air blocked in the compression cylinder 701 is discharged to ensure the purity of the nitrogen in the compression cylinder 701.

[0035] An upper air suction head 710 is provided on the outside of the upper expansion bag 704, and a guide plate 711 is fixedly connected to the top of the upper air suction head 710. A suction space is formed between the guide plate 711 and the expansion bag 704. The upper air suction head 710 is connected to an external suction device through an air suction pipe 712. The upper air suction head 710 is used to recover waste gas, and its suction force is greater than that of the lower air suction head 709 at the bottom.

[0036] The expansion bag 704 is arranged on the outward side of the connecting seat 703, and the inner side of the connecting seat 703 is provided with a squeezing bag 705. The two squeezing bags 705 are provided with a squeezing plate 706 on the side facing each other. A squeezing cylinder 707 is arranged between the two squeezing plates 706. The squeezing cylinder 707 is connected to an external high-pressure gas source through a high-pressure gas pipe 708. When the welding is completed, the squeezing cylinder 707 is connected to the high-pressure gas through the high-pressure gas pipe 708, and the squeezing cylinder 707 is extended to squeeze the squeezing plate 706, thereby squeezing the squeezing plate 706. The outer diameter of the extrusion capsule 705 is smaller than the welding line. The medium in the extrusion capsule 705 is pressed into the expansion capsule 704. The expansion capsule 704 expands and contacts the inner wall of the compression cylinder 701. When the compression member 7 contacts the cap assembly, the gas is discharged through the high-pressure air pipe 708, the extrusion cylinder 707 contracts, and the expansion capsule 704 contracts rapidly under its own elastic force. Since the volume change of the extrusion cylinder 707 is small, and the connecting diameter between the expansion capsule 704 and the extrusion capsule 705 is large, the expansion and contraction can be realized quickly. In the gas embodiment, an electromagnet can also be used instead of the extrusion cylinder 707 to drive the extrusion plate 706 to move.

[0037] A clamping ring 715 is provided at the bottom of the clamping cylinder 701. The diameter of the clamping ring 715 is larger than the diameter of the welding wire. When the magnet 716 presses the cap, a sealed space is formed to prevent external air from entering.

[0038] The outward side of the expansion bag 704 is designed as a cone surface to ensure that the nitrogen can flow smoothly at the bottom of the expansion bag 704, while also reducing the trapped air.

[0039] See also Figure 4 The expansion capsule 704 includes a base 7041 fixedly connected to the connecting seat 703, and the base 7041 is covered with an outer capsule 7043 without elasticity. A plurality of radially arranged elastic sheets 7044 are arranged between the outer capsule 7043 and the base 7041, so that the expansion capsule 704 can only expand and contract radially, and can also retract quickly. In order not to interfere with the expansion and contraction of the expansion capsule 704 and not to occupy the bottom or top space of the expansion capsule 704, a connecting pipe 7042 is arranged in the middle of the base 7041, and the connecting pipe 7042 is connected to the suction pipe 712, and passes through the expansion capsule 704 and is connected to the lower suction head 709.

[0040] See also Figure 1 and Figure 5 A movable sleeve 714 is provided on the inner side of the clamping cylinder 701, and the clamping cylinder 701 is connected to the connecting rod 702 through the movable sleeve 714. The movable sleeve 714 and the connecting rod 702 are fixedly connected, and the movable sleeve 714 can rotate. Due to the obstruction of the connecting rod 702, the weld cannot form a complete circle. For this reason, during welding, the starting point of the welding line is on one side of the connecting rod 702. During welding, the movable sleeve 714 rotates a certain angle in the moving direction of the welding line so that the welding lines can be connected.

[0041] A magnet 716 is embedded on one side of the movable sleeve 714, and an electromagnet 717 is provided on the outer side of the clamping cylinder 701. When no power is supplied, the magnet 716 and the electromagnet 717 attract each other. When welding starts, the electromagnet 717 is energized, and the movable sleeve 714 rotates a certain angle in the welding direction under the repulsive force.

[0042] In order to prevent the suction pipe 712 and the high-pressure air pipe 708 from interfering with the laser welding, the parts of the suction pipe 712 and the high-pressure air pipe 708 located in the movable sleeve 714 are all located in the connecting rod 702, that is, the connecting rod 702 is hollow, and the outer wall of the movable sleeve 714 is provided with an interface connected to the high-pressure air pipe 708 and the suction pipe 712, and the side wall of the clamping cylinder 701 is provided with a movable groove 718 for the movement of the interface. In order to prevent the movable groove 718 from leaking, a movable sealing structure is provided between the upper and lower ends of the movable sleeve 714 and the clamping cylinder 701.

Claims

1. A cylindrical power lithium battery cap laser welding machine, comprising: A material distribution plate (1), wherein the material distribution plate (1) is provided with an accompanying clamp (2); A laser welding head (4), wherein the laser welding head (4) is mounted on a column (3) on one side of the material distribution plate (1); A clamping member (7) is arranged directly below the laser welding head (4), the clamping member (7) is connected to a driving cylinder (6) via a connecting arm (5), the driving cylinder (6) is arranged on one side of the material distribution plate (1), and the driving cylinder (6) drives the clamping member (7) to move up and down, characterized in that: The clamping member (7) comprises a clamping cylinder (701) fixedly connected to the connecting arm (5); the inner wall of the clamping cylinder (701) is connected to a connecting seat (703) near the upper and lower ends via a connecting rod (702); one side of the connecting seat (703) is connected to an expansion bag (704); the expansion bag (704) is coaxial with the clamping cylinder (701); the expansion bag (704) is completely located within the welding line when in a contracted state; and can contact the inner wall of the clamping cylinder (701) when in an expanded state; an air inlet pipe (713) is provided on the side wall of the clamping cylinder (701); the air inlet pipe (713) introduces inert gas into the clamping cylinder (701); the expansion bag (704) contracts when the clamping cylinder (701) contacts the cap, and expands after welding is completed; A lower air suction head (709) is provided below the lower expansion bag (704), the lower air suction head (709) is connected to an external air extraction device via an air suction pipe (712), and an air inlet hole is provided on the side of the lower air suction head (709); An upper air suction head (710) is provided on the outside of the upper expansion bag (704), and a guide plate (711) is fixedly connected to the top of the upper air suction head (710), and an air extraction space is formed between the guide plate (711) and the expansion bag (704), and the upper air suction head (710) is connected to an external air extraction device through an air suction pipe (712); the expansion bag (704) is provided on the outward side of the connecting seat (703), and an extrusion bag (705) is provided on the inward side of the connecting seat (703), and an extrusion plate (706) is provided on the opposite side of the two extrusion bags (705), and an extrusion cylinder (707) is provided between the two extrusion plates (706), and the extrusion cylinder (707) is connected to an external high-pressure gas source through a high-pressure gas pipe (708). When welding is completed, the extrusion cylinder (707) is discharged. 07) High-pressure gas is connected through a high-pressure gas pipe (708). When the clamping piece (7) contacts the cap assembly, the gas is discharged through the high-pressure gas pipe (708). A movable sleeve (714) is provided on the inner side of the clamping cylinder (701). The clamping cylinder (701) is connected to the connecting rod (702) through the movable sleeve (714). The movable sleeve (714) and the connecting rod (702) are fixedly connected. The movable sleeve (714) can rotate. A magnet (716) is embedded on one side of the movable sleeve (714). An electromagnet (717) is provided on the outer side of the clamping cylinder (701). When no power is supplied, the magnet (716) and the electromagnet (717) attract each other. When welding starts, the electromagnet (717) is energized, and the movable sleeve (714) rotates a certain angle in the welding direction under the repulsive force.

2. The cylindrical power lithium battery cap laser welding machine according to claim 1 is characterized in that: A pressing ring (715) is provided at the bottom of the pressing cylinder (701), and the diameter of the pressing ring (715) is greater than the diameter of the welding wire.

3. The cylindrical power lithium battery cap laser welding machine according to claim 2 is characterized in that: The outward side of the expansion bag (704) is configured as a conical surface.

4. The cylindrical power lithium battery cap laser welding machine according to claim 2 is characterized in that: The expansion bladder (704) comprises a base (7041) fixedly connected to the connecting seat (703); the base (7041) is covered with an outer bladder (7043) without elasticity; and a plurality of radially arranged elastic sheets (7044) are provided between the outer bladder (7043) and the base (7041).

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