Connecting piece laser welding pressure head structure

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a connecting piece laser welding pressure head structure which comprises a connecting seat, a lining, a connecting pipe and a pressure head. A dust removal opening connected with the dust removal branch pipe is formed in the end of the connecting base and communicates with the light passing channel. The lining and the pressure head are installed at the bottom of the light-passing channel, the lining is located in the pressure head, and an airflow channel is formed between the lining and the pressure head; the connecting base is further provided with an air blowing channel, and a connecting pipe is arranged between the air blowing channel and the pressing head. According to the utility model, the scrap cost of the pressure head and the compact combination degree between the connecting sheet and the cover plate can be effectively improved, and the problems of bending, position deviation, poor gas protection effect and the like of the connecting sheet can be effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and in particular relates to a connecting piece laser welding pressure head structure. Background Art

[0002] During the manufacturing process of square shell batteries, the connecting piece and the cover plate need to be connected and fixed. The laser welding pressure head is connected to the cylinder. The cylinder pushes the pressure head to apply force on the connecting piece, so that the connecting piece and the top cover assembly fit tightly, thereby realizing laser welding of the connecting piece and the top cover assembly.

[0003] At present, during the welding process of the connecting piece, splashes will be generated and adhered to the surface of the pressure head structure. When the pressure head structure is cleaned, it will be worn, causing the shape of the pressure head to be deformed and affecting the welding effect, and even making the pressure head structure scrapped and unable to completely press the connecting piece onto the cover plate. In order to reduce the cost and the use effect of the pressure head, it is necessary to optimize the design of the pressure head structure. Utility Model Content

[0004] The utility model provides a connecting piece laser welding pressure head structure, which can effectively improve the cost of pressure head scrapping, the compactness of the connecting piece and the cover plate, and effectively avoid problems such as connecting piece bending, position deviation and poor protective gas effect.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a connecting piece laser welding pressure head structure, including a connecting seat, an inner lining, a connecting pipe, and a pressure head, wherein:

[0006] A light-through channel is provided longitudinally on the connecting seat;

[0007] The end of the connecting seat is provided with a dust removal port connected to the dust removal branch pipe, and the dust removal port is communicated with the light passage;

[0008] The liner and the pressure head are installed at the bottom of the light-through channel, the liner is located in the pressure head, and an air flow channel is provided between the liner and the pressure head;

[0009] The connecting seat is also provided with an air blowing channel, and a connecting pipe is provided between the air blowing channel and the pressure head.

[0010] As a further preferred embodiment of the present invention, the liner and the pressure head are both conical structures with openings at both ends, and the large-diameter end of the conical structure is connected to the bottom of the light passage.

[0011] As a further preference of the utility model, a groove for installing the lining is provided at the connecting seat at the bottom of the light passage, a guide column is provided around the groove, an elastic part is sleeved on the guide column, and a sleeve hole matching the guide column is provided on the edge of the lining, and the lining moves up and down along the guide column under the action of the elastic part.

[0012] As a further preferred embodiment of the present invention, a small-diameter end of the liner is provided with an arc-shaped guide block, and a side of the arc-shaped guide block facing the connecting pipe has a notch communicating with the airflow channel.

[0013] As a further preferred embodiment of the present invention, threaded holes are provided at four corners of the edge of the pressure head, and the threaded holes realize a fixed connection between the pressure head and the connecting seat through a locking piece.

[0014] As a further preferred embodiment of the present invention, a connecting hole is provided on the side of the pressure head, and the connecting hole is connected to the blowing channel.

[0015] As a further preferred embodiment of the present invention, the connecting seat is provided with a combination of two sets of inner liners, connecting pipes and pressure heads.

[0016] Through the above technical solution, compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model is provided with an inner liner and a shielding gas is blown into the cavity between the inner liner and the pressure head. The flow consistency of the shielding gas is significantly improved, and the mixing of welding dust and shielding gas is achieved, thereby effectively improving the protection effect of welding and improving the welding effect of the battery connecting piece. This reduces the frequency of replacing the pressure head and adopts an inner liner with lower replacement cost. The spatter or dust generated after welding adheres to the inner liner, which avoids the method of directly replacing the pressure head and effectively reduces the cost.

[0018] The utility model provides a double fixing effect of the inner lining and the pressure head on the connecting piece, which can make the fixing effect better and avoid welding defects such as cold welding caused by loose press fitting.

[0019] The utility model can effectively improve the cost of scrapping the pressure head, the compactness of the connection piece and the cover plate, and effectively avoid the problems of bending of the connection piece, position deviation and poor effect of protective gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1 It is a three-dimensional diagram of the laser welding head structure of the connecting piece of the utility model;

[0022] Figure 2 It is a top view of the laser welding pressure head structure of the connecting piece of the utility model;

[0023] Figure 3 This is a central cross-sectional view of the laser welding head structure of the connecting piece of the utility model;

[0024] Figure 4 The laser welding head structure of the connecting piece of the utility model Figure 3 A partial enlarged view of point A;

[0025] Figure 5 A three-dimensional diagram of a pressing head of a laser welding pressing head structure of a connecting piece of the utility model;

[0026] Figure 6 A three-dimensional diagram of the inner lining of the laser welding pressure head structure of the connecting piece of the utility model;

[0027] In the figure: 10 - connecting seat; 11 - dust removal port; 12 - light passage; 13 - air blowing passage; 14 - guide column; 20 - pressure head; 21 - threaded hole; 22 - connecting hole; 30 - connecting pipe; 40 - lining; 41 - arc guide block; 50 - elastic member. DETAILED DESCRIPTION

[0028] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0029] In the description of the present utility model, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. "First", "second" and the like do not indicate the importance of the components, and therefore cannot be understood as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the scope of protection of the present invention. Example

[0030] This embodiment provides a preferred implementation scheme, a connecting piece laser welding pressure head structure, such as Figures 1 to 6 As shown, it includes a connecting seat 10, two blowing channels 13, two liners 40, and two pressure heads 20, wherein:

[0031] Two light passages 12 for laser passage are provided along the height direction of the connecting seat 10 (the light passages 12 are used to provide an effective channel for the laser to irradiate the connecting piece), and dust removal ports 11 which can be connected to the dust removal branch pipe are provided at both ends of the connecting seat 10, and each light passage 12 is connected to a dust removal port 11 (the dust removal port 11 absorbs the dust generated by laser welding and promotes the directional flow of the protective gas), and the light passage 12 has openings at the upper and lower parts of the connecting seat 10, which are connected to the dust removal port 11 arranged on the outer side thereof.

[0032] Two blowing channels 13 are provided between the two light channels 12 along the height direction of the connection base 10. Preferably, with the middle of the connection base 10 as the center, the two light channels 12 are symmetrically arranged, the two blowing channels 13 are symmetrically arranged, and the two grooves are symmetrically arranged.

[0033] The liner 40 is in an inverted cone structure, the large-diameter end of the liner 40 is installed at the lower opening of the light passage 12, and the small-diameter end of the liner 40 is provided with an arc-shaped guide block 41. Preferably, the large-diameter end of the liner 40 is rectangular, and the small-diameter end of the liner 40 is circular.

[0034] The pressure head 20 is an inverted cone structure, and a connection hole 22 is provided on the opposite side of the two pressure heads 20. Each connection hole 22 is connected to the blowing channel 13 adjacent to it through a connection pipe 30. The pressure head 20 is covered outside the liner 40 and connected to the connection seat 10. Preferably, the large-diameter end of the pressure head 20 is rectangular, and the small-diameter end of the pressure head 20 is circular. It should be noted that the central axis of the pressure head 20 and the liner 40 coincides.

[0035] Preferably, the movable range of the lining 40 is larger than that of the pressure head 20. When not acting on the connecting plate, the lining 40 extends in the axial direction more than the pressure head 20. When the connecting plate is compressed, the lining 40 extends in the axial direction the same as that of the pressure head 20.

[0036] In this embodiment, the side of the small-diameter end of the liner 40 away from the arc-shaped guide block 41 is oriented toward the opening position of the connecting hole 22 on the pressure head 20. Thus, the protective gas can flow into the inner cavity of the liner 40 better.

[0037] A guide column 14 with an elastic member 50 is provided at the lower opening of the light passage 12 . The edge of the liner 40 is sleeved on each guide column 14 through a circular hole one by one. Under the spring force of the elastic member 50 , the liner 40 is in a downward position.

[0038] It should be noted that during installation, the elastic member 50 is sleeved inside the guide column 14, and then the lining 40 is embedded into the groove of the connecting seat 10, and then the pressing head 20 is locked with the connecting seat 10, and the screw is passed through the threaded hole 21 on the pressing head to connect with the connecting seat 10. After installation, the pressing head 20 is fixed, and the lining 40 has space to move up and down inside the pressing head 20, thereby completing the installation of the connecting seat 10, the lining 40 and the pressing head 20.

[0039] When the pressure head 20 and the liner 40 are both installed on the connecting seat 10, the large-diameter end of the pressure head 20 completely covers the groove, the inner diameter of the small-diameter end of the pressure head 20 contacts the outer diameter of the small-diameter end of the liner 40, and an airflow cavity is formed between the pressure head 20 and the liner 40, and the arc-shaped guide block 41 extends out of the pressure head 20, and the arc-shaped guide block 41 has a notch connected to the airflow channel on the side facing the connecting hole 22.

[0040] When the liner 40 and the pressure head 20 are both pressed on the connecting piece, the liner 40 is pushed toward the groove direction, the arc-shaped guide block 41 moves toward the inner cavity of the pressure head 20, and the gap (airflow channel) between the pressure head 20 and the liner 40 becomes larger. As the liner 40 moves upward, the gap of the arc-shaped guide block 41 at the lower part is connected with the airflow channel, completing the connection of the connecting pipe 30-airflow channel-light channel 12 and the dust removal port 11. At this time, the shielding gas is introduced from the blowing channel 13, passes through the connecting pipe 30 and enters the cavity. Since the dust removal port 11 can be connected to an external dust suction device, most of the shielding gas with welding dust will be discharged from the dust removal port 11.

[0041] The present embodiment is provided with a liner 40 and by blowing a shielding gas (the shielding gas is an inert gas or nitrogen) into the cavity between the liner 40 and the pressure head 20, the flow consistency of the shielding gas can significantly improve the mixing of welding dust and shielding gas, and effectively improve the welding protection effect. At the same time, the shielding gas also has a cooling effect on the liner, thereby reducing the bonding strength of the splash on the liner 40, reducing the frequency of cleaning the pressure head 20 and the liner 40, and adopting a liner 40 with a lower replacement cost. The splash or dust generated after welding adheres to the liner 40, avoiding the method of directly replacing the pressure head 20, and effectively reducing the cost.

[0042] In order to prevent the inner liner 40 from deflecting when it moves in the pressure head 20, the present embodiment provides guide posts 14 on both sides of the groove, and the two ends of the inner liner 40 are sleeved on the guide posts 14. The inner liner 40 can move axially along the guide posts 14, and the guide posts 14 provide guidance for the movement of the inner liner 40. An elastic member 50 is sleeved on the outer side of the guide post 14, and the elastic member 50 is sleeved on the guide post 14; preferably, the elastic member 50 is a threaded spring. One end of the threaded spring is connected to the groove, and the other end is a free end. When the inner liner 40 is installed on the guide post 14, the free end of the threaded spring is always in contact with the inner liner 40.

[0043] When the pressure head 20 is covered on the outside of the liner 40, the liner 40 is completely embedded in the pressure head 20, the elastic member 50 is not compressed, and the arc-shaped guide block 41 extends out of the small-diameter end of the pressure head 20. At this time, the inner diameter of the small-diameter end of the pressure head 20 is in contact with the outer diameter of the small-diameter end of the liner 40; when the liner 40 and the pressure head 20 are both pressed on the connecting plate, the liner 40 will move upward axially along the guide column 14, and the arc-shaped guide block 41 will move to be flush with the small-diameter end of the pressure head 20. At the same time, the elastic member 50 is compressed to give the liner 40 a force pressing toward the connecting plate, ensuring that the liner 40 is always pressed on the connecting plate.

[0044] In this embodiment, two first ear plates are provided at both ends of the liner 40, and holes are opened in the first ear plates. The holes on the first ear plates cooperate with the guide pillars 14 to achieve connection between the liner 40 and the guide pillars 14. Two second ear plates are provided on the outer side of the large-diameter end of the pressure head 20, and two threaded holes 21 are provided on both second ear plates. The pressure head 20 is connected to the connection seat 10 by screws or other fasteners cooperating with the threaded holes 21. A groove matching the shape of the first ear plate is provided in the middle of the second ear plate, so as to facilitate timely matching of the optimal installation position between the pressure head 20 and the liner 40 during installation.

[0045] In this embodiment, two card slots of different sizes are arranged on both sides of the connecting seat 10 in the length direction, and the front and back sides of the connecting seat 10 are determined by the two card slots of different sizes.

[0046] The working principle and usage process of this implementation plan:

[0047] First, the liner 40 compacts the connecting piece for the first time, and then the pressing head 20 compacts the connecting piece for the second time. The elastic positioning and the rigid positioning are combined to effectively reduce the positioning difference and the defect of loose fitting between the connecting piece and the cover plate.

[0048] After the liner 40 and the pressure head 20 have positioned the connecting piece, the protective gas is blown into the cavity through the blowing channel 13 and the connecting pipe 30 to protect the welding. At the same time, there is a negative pressure at the dust removal port 11, which sucks the gas or dust into the dust removal mechanism for collection.

[0049] After multiple uses, welding slag or spatter is easily attached to the liner 40. Due to the blocking of the liner 40, the welding slag or spatter is prevented from contaminating the pressure head 20. Only the liner 40 needs to be replaced or cleaned, which reduces the frequency of replacement or cleaning of the pressure head 20, effectively reducing costs and cleaning time.

[0050] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0051] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0052] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0053] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A connecting piece laser welding head structure, characterized in that: It comprises a connecting seat (10), an inner liner (40), a connecting pipe (30), and a pressure head (20), wherein: A light passage (12) is provided longitudinally on the upper side of the connecting seat (10); A dust removal port (11) connected to the dust removal branch pipe is formed at the end of the connection seat (10), and the dust removal port (11) is communicated with the light passage (12); The liner (40) and the pressure head (20) are installed at the bottom of the light-transmitting channel (12), the liner (40) is located inside the pressure head (20), and an air flow channel is provided between the liner (40) and the pressure head (20); An air blowing channel (13) is also provided on the connecting seat (10), and a connecting pipe (30) is provided between the air blowing channel (13) and the pressure head (20).

2. A connecting piece laser welding pressure head structure according to claim 1, characterized in that: The inner liner (40) and the pressure head (20) are both conical structures with openings at both ends, and the large-diameter end of the conical structure is connected to the bottom of the light-passing channel (12).

3. A connecting piece laser welding pressure head structure according to claim 2, characterized in that: A groove for mounting the inner liner (40) is provided at the connection seat (10) at the bottom of the light passage (12), a guide column (14) is provided around the groove, an elastic member (50) is sleeved on the guide column (14), and a sleeve hole matching the guide column (14) is provided at the edge of the inner liner (40), and the inner liner (40) moves up and down along the guide column (14) under the action of the elastic member (50).

4. The connecting piece laser welding pressure head structure according to claim 3, characterized in that: The small-diameter end of the liner (40) is provided with an arc-shaped guide block (41), and the side of the arc-shaped guide block (41) facing the connecting pipe (30) has a notch communicating with the air flow channel.

5. A connecting piece laser welding pressure head structure according to claim 1 or 4, characterized in that: The four corners of the edge of the pressure head (20) are provided with threaded holes (21), and the threaded holes (21) are used to achieve a fixed connection between the pressure head (20) and the connecting seat (10) through a locking piece.

6. A connecting piece laser welding pressure head structure according to claim 1 or 4, characterized in that: A connecting hole (22) is provided on the side of the pressure head (20), and the connecting hole (22) is connected to the blowing channel (13).

7. The connecting piece laser welding pressure head structure according to claim 1, characterized in that: The connection seat (10) is provided with a combination of two sets of liners (40), a connection pipe (30), and a pressure head (20).

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