Welding pressure head and laser welding equipment

Abstract

The utility model provides a welding pressure head and laser welding equipment, and relates to the technical field of battery manufacturing. The welding pressure head comprises a pressure head body, a first through cavity and an air distribution cavity surrounding the first through cavity are formed in the pressure head body, the first through cavity is used for allowing laser to pass through, an air inlet channel is formed in the side face of the pressure head body and communicates with the air distribution cavity, and a plurality of air distribution channels are formed in the bottom of the air distribution cavity; the multiple air distribution channels are evenly distributed around the first through cavity, and the ends of the air distribution channels extend to the bottom of the pressing head body. According to the welding pressure head, the gas inlet channel, the gas distribution cavity and the plurality of uniformly distributed gas distribution channels are arranged in the pressure head body, so that external shielding gas is introduced into the pressure head body, is uniformly diffused and is blown to the surface of a to-be-welded part, a welding seam can be better protected, and the welding quality can be better improved.

Description

Technical Field

[0001] The present application relates to the field of battery manufacturing technology, and in particular to a welding pressure head and laser welding equipment. Background Art

[0002] During the welding process of the battery cell pole and the tab of the battery module, if there is a gap between the tab and the pole, it is easy to cause problems such as explosion points and cold welding. Therefore, it is necessary to use a pressure head to press the tab to achieve a tight fit between the tab and the pole. At the same time, it is necessary to blow a protective gas (such as nitrogen) at the welding point to achieve the purpose of protecting the weld and improving the welding quality. However, the blowing structure on the existing pressure head is not uniform enough to meet the growing welding requirements. Utility Model Content

[0003] The purpose of the present application is to provide a welding pressure head and laser welding equipment to address the deficiencies in the above-mentioned prior art, which can evenly blow protective gas to the workpieces to be welded, thereby better protecting the weld and improving the welding quality.

[0004] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0005] One aspect of an embodiment of the present application provides a welding ram, including: a ram body, a first through cavity and an air dividing cavity surrounding the first through cavity provided in the ram body, the first through cavity being used to allow laser to pass through, an air inlet passage provided on the side of the ram body, the air inlet passage being connected to the air dividing cavity, a plurality of air dividing passages provided at the bottom of the air dividing cavity, the plurality of air dividing passages being evenly distributed around the first through cavity, and the end of the air dividing passage extending to the bottom of the ram body.

[0006] Optionally, a sealing plate is further included, a mounting groove is provided on the top of the pressure head body, the sealing plate is fixed in the mounting groove, an air dividing cavity is formed between the sealing plate and the mounting groove, a second through cavity is also provided on the sealing plate, and the second through cavity is connected to the first through cavity.

[0007] Optionally, it also includes a mounting seat, the pressure head body is slidably set on the mounting seat, and a third through cavity is provided on the mounting seat. The first through cavity, the second through cavity and the third through cavity are connected in sequence and coaxially arranged.

[0008] Optionally, there are two air intake passages, and the two air intake passages are symmetrically distributed relative to the axis of the first through cavity.

[0009] Optionally, a quick connector is provided at the end of the air inlet passage located on the side of the pressure head body, and the quick connector is used to connect to the protective gas source.

[0010] Optionally, it also includes an exhaust cylinder, the end of which is inserted into the pressure head body and communicated with the first through cavity, and the connecting end surface of the exhaust cylinder is in contact with the inner surface of the first through cavity.

[0011] Optionally, the first through cavity is tapered, and a cross-sectional area of ​​the first through cavity gradually decreases from the top of the pressure head body to the bottom of the pressure head body.

[0012] Optionally, the exhaust cylinder includes a first exhaust cylinder and a second exhaust cylinder connected to the first exhaust cylinder, the axis of the second exhaust cylinder is perpendicular to the axis of the first through cavity, the axis of the first exhaust cylinder is parallel to the axis of the first through cavity, the connecting end face of the second exhaust cylinder is fitted with the inner surface of the first through cavity, and the side wall of the second exhaust cylinder is fixed to the pressure head body by screws.

[0013] Optionally, it also includes a mounting seat, a connecting shaft is provided at the bottom of the mounting seat, the pressure head body is located below the mounting seat and is sleeved on the connecting shaft, the bottom of the pressure head body is abutted against the end face of the connecting shaft, a spring is sleeved on the connecting shaft, and the opposite ends of the spring are respectively abutted against the mounting seat and the pressure head body.

[0014] Another aspect of an embodiment of the present application provides a laser welding device, comprising a welding head as described above.

[0015] The beneficial effects of this application include:

[0016] The present application provides a welding pressure head, comprising: a pressure head body, a first through cavity and a gas dividing cavity surrounding the first through cavity are arranged in the pressure head body, the first through cavity is used to allow laser to pass through, an air inlet passage is arranged on the side of the pressure head body, the air inlet passage is connected with the gas dividing cavity, a plurality of gas dividing passages are arranged at the bottom of the gas dividing cavity, the plurality of gas dividing passages are evenly distributed around the first through cavity, and the end of the gas dividing passage extends to the bottom of the pressure head body. The welding pressure head is provided with an air inlet passage, a gas dividing cavity and a plurality of evenly distributed gas dividing passages in the pressure head body, so that the external protective gas is introduced into the pressure head body and evenly diffused, and blown to the surface of the workpiece to be welded, so as to better protect the weld and improve the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a pressure head body in a welding pressure head provided in an embodiment of the present application;

[0019] Figure 2 A cross-sectional view of a welding pressure head provided in an embodiment of the present application;

[0020] Figure 3One of the structural schematic diagrams of the welding pressure head provided in the embodiment of the present application;

[0021] Figure 4 The second structural schematic diagram of the welding pressure head provided in the embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of the exhaust tube in the welding pressure head provided in an embodiment of the present application.

[0023] Icons: 100-welding pressure head; 110-pressure head body; 111-first through cavity; 112-gas distribution cavity; 113-air inlet passage; 114-gas distribution passage; 115-mounting groove; 116-annular lug; 117-through hole; 120-sealing plate; 121-second through cavity; 130-mounting seat; 131-third through cavity; 140-quick connector; 150-exhaust cylinder; 151-first exhaust cylinder; 152-second exhaust cylinder; 153-connecting end face; 154-threaded hole; 160-connecting shaft; 170-spring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] In one aspect of the embodiment of the present application, referring to Figure 1 and Figure 2 , a welding ram 100 is provided, including: a ram body 110, a first through cavity 111 and an air dividing cavity 112 surrounding the first through cavity 111 are provided in the ram body 110, the first through cavity 111 is used to allow laser to pass through, an air inlet passage 113 is provided on the side of the ram body 110, the air inlet passage 113 is connected to the air dividing cavity 112, a plurality of air dividing passages 114 are provided at the bottom of the air dividing cavity 112, the plurality of air dividing passages 114 are evenly distributed around the first through cavity 111, and the end of the air dividing passage 114 extends to the bottom of the ram body 110.

[0031] The welding ram 100 includes a ram body 110, which is applied to laser welding equipment, and the bottom is used to press the workpiece to be welded. A first through cavity 111 is provided inside the ram body 110, and the first through cavity 111 runs through the top and bottom of the ram body 110. The first through cavity 111 is used to allow the laser to pass through and irradiate the workpiece to be welded for laser welding. During welding, in order to protect the weld and improve the welding quality, the ram body 110 also needs to blow protective gas to the workpiece to be welded. Therefore, the ram body 110 is also provided with an air intake passage 113, a gas distribution cavity 112 and a gas distribution passage 114 connected in sequence for the circulation of protective gas. Among them, one end of the air intake passage 113 is located on the side of the ram body 110, which is used to connect to the external protective gas source, and the other end is connected to the gas distribution cavity 112. For example, the other end of the air intake passage 113 is located on the side wall of the gas distribution cavity 112. One end of the gas distribution passage 114 is located at the bottom of the gas distribution cavity 112, and the other end is located at the bottom of the pressure head body 110, guiding the shielding gas from the top to the bottom of the pressure head body 110. The shielding gas enters the gas distribution cavity 112 from the air inlet passage 113, diffuses and then enters the gas distribution passage 114, and finally blows to the surface of the workpiece to be welded. The gas distribution passage 114 includes multiple gas distribution passages 114, and the multiple gas distribution passages 114 are evenly distributed around the axis of the first through cavity 111 on the outside of the first through cavity 111, so that the shielding gas blown to the workpiece to be welded is more uniform, so as to better protect the weld and improve the welding quality.

[0032] The above-mentioned welding ram 100, by arranging an air inlet passage 113, an air distribution cavity 112 and a plurality of evenly distributed air distribution passages 114 in the ram body 110, introduces external protective gas into the ram body 110 and diffuses it evenly, blowing it toward the surface of the workpiece to be welded, which can better protect the weld and improve the welding quality.

[0033] Optionally, in one possible implementation of the present application, please refer to Figure 3 The welding ram 100 also includes a sealing plate 120, which is used to cooperate with the ram body 110 to form a gas chamber 112, and to seal the top of the gas chamber 112 to prevent leakage of the protective gas. Specifically, a mounting groove 115 is provided on the top of the ram body 110, and the sealing plate 120 is fixed in the mounting groove 115. There is a gap between the sealing plate 120 and the mounting groove 115, thereby forming the gas chamber 112. A second through cavity 121 is also provided on the sealing plate 120, and the second through cavity 121 passes through the top and bottom of the sealing plate 120 and is connected to the first through cavity 111. The laser emitted by the laser welding equipment is irradiated onto the workpiece to be welded through the second through cavity 121 and the first through cavity 111.

[0034] For example, the longitudinal cross-sections of the sealing plate 120 and the mounting groove 115 are at least partially T-shaped, and both have a horizontal portion and a vertical portion. The horizontal portion of the sealing plate 120 is fixedly installed in the horizontal portion of the mounting groove 115, and the vertical portion of the sealing plate 120 extends into the vertical portion of the mounting groove 115, and the diameter of the vertical portion of the sealing plate 120 is smaller than the diameter of the vertical portion of the mounting groove 115; an air dividing cavity 112 is formed between the outer wall of the vertical portion of the sealing plate 120 and the inner wall of the vertical portion of the mounting groove 115, and the bottom of the vertical portion of the mounting groove 115 is the bottom of the air dividing cavity 112, and the bottom of the horizontal portion of the sealing plate 120 blocks the top of the air dividing cavity 112.

[0035] Optionally, in one achievable manner of the embodiment of the present application, the welding ram 100 further includes a mounting seat 130, and the ram body 110 is fixed to the laser welding equipment through the mounting seat 130. The ram body 110 is slidably disposed on the mounting seat 130, so that when the ram body 110 is pressed on the surface of the workpiece to be welded, the pressure can be adjusted by floating to prevent excessive pressure from damaging the workpiece to be welded. A third through cavity 131 is disposed on the mounting seat 130, and the first through cavity 111, the second through cavity 121 and the third through cavity 131 are sequentially connected and coaxially disposed to ensure that the center line of the laser coincides with the ram body 110. The laser emitted by the laser welding equipment is irradiated onto the workpiece to be welded through the third through cavity 131, the second through cavity 121 and the first through cavity 111 in sequence.

[0036] Furthermore, the sealing plate 120 has a cylindrical portion, and the cylindrical portion is inserted into the third through cavity 131 of the mounting seat 130 .

[0037] Optionally, in one possible implementation of the present application, please refer to Figure 2 and Figure 4 The air inlet passages 113 include two. The air inlet passages 113 are provided with two air inlet passages 113, and the air inlet efficiency is higher. The two air inlet passages 113 are symmetrically distributed relative to the axis of the first through cavity 111, so that the diffusion of the protective gas in the air distribution cavity 112 is more uniform, and the uniformity of the blowing of the pressure head body 110 is further improved.

[0038] Optionally, in one achievable manner of the embodiment of the present application, a quick connector 140 is provided at the end of the air inlet passage 113 located on the side of the pressure head body 110, and the quick connector 140 is used to connect to the protective gas source. The provision of the quick connector 140 can enable the pressure head body 110 to be quickly connected or disconnected from the protective gas source, and can also prevent leakage of the protective gas.

[0039] Optionally, in one possible implementation of the present application, please refer to Figure 2 and Figure 3The welding ram 100 further includes an exhaust cylinder 150 , an end of which is inserted into the ram body 110 and communicates with the first through cavity 111 , and a connecting end surface 153 of the exhaust cylinder 150 is in contact with an inner surface of the first through cavity 111 .

[0040] The exhaust cylinder 150 is used to extract welding slag and dust generated during welding. One end of the exhaust cylinder 150 is used to connect the exhaust hose, and the other end is inserted into the pressure head body 110. The end surface of the exhaust cylinder 150 inserted into the pressure head body 110 fits with the inner surface of the first through cavity 111, so that the exhaust cylinder 150 is connected to the first through cavity 111, and ensures that there is no gap between the two, thereby avoiding or reducing the accumulation of welding slag. At this time, the welding pressure head 100 integrates the functions of shielding gas blowing, pressing the workpiece to be welded, and exhausting and dust removal. The structure is compact and simple and can further improve the welding quality.

[0041] It should be noted that in order to avoid the air separation passage 114 from being connected to the exhaust cylinder 150 and causing interference between blowing and exhausting, the air separation passage 114 may be eliminated in the area of ​​the pressure head body 110 passing through the exhaust cylinder 150.

[0042] Optionally, in one achievable manner of the embodiment of the present application, the first through cavity 111 is tapered, and the cross-sectional area of ​​the first through cavity 111 gradually decreases from the top of the pressure head body 110 to the bottom of the pressure head body 110. The tapered design of the first through cavity 111, combined with the suction effect of the exhaust cylinder 150, can minimize the adsorption and residue of welding slag.

[0043] Optionally, in one possible implementation of the present application, please refer to Figure 2 and Figure 5 The exhaust cylinder 150 includes a first exhaust cylinder 151 and a second exhaust cylinder 152 connected to the first exhaust cylinder 151, the axis of the second exhaust cylinder 152 is perpendicular to the axis of the first through cavity 111, the axis of the first exhaust cylinder 151 is parallel to the axis of the first through cavity 111, the connecting end surface 153 of the second exhaust cylinder 152 is in contact with the inner surface of the first through cavity 111, and the side wall of the second exhaust cylinder 152 is fixed to the pressure head body 110 by screws.

[0044] For example, an annular lug 116 is provided on the top of the pressure head body 110, and the second exhaust cylinder 152 is located below the annular lug 116. A through hole 117 is provided on the annular lug 116, and a threaded hole 154 is provided on the second exhaust cylinder 152. The screw passes through the through hole 117 and is threadedly connected with the threaded hole 154, thereby fixing the exhaust cylinder 150 on the pressure head body 110.

[0045] Optionally, in one possible implementation of the present application, please refer to Figure 2 and Figure 3The welding ram 100 also includes a mounting seat 130, and the ram body 110 is fixed to the laser welding equipment through the mounting seat 130. A connecting shaft 160 is provided at the bottom of the mounting seat 130, and the ram body 110 is located below the mounting seat 130 and is sleeved on the connecting shaft 160. The bottom of the ram body 110 abuts against the end face of the connecting shaft 160, and the ram body 110 can slide back and forth between the mounting seat 130 and the end face of the connecting shaft 160 along the axial direction of the connecting shaft 160. A spring 170 is sleeved on the connecting shaft 160, and the opposite ends of the spring 170 abut against the mounting seat 130 and the ram body 110 respectively. The spring 170 presses the ram body 110 to ensure that the ram body 110 can press the workpiece to be welded. At the same time, it can also provide a floating force for the ram body 110, so that the ram body 110 can float when pressing the workpiece to be welded, thereby preventing the workpiece to be welded from being damaged by excessive pressure.

[0046] For example, an annular lug 116 is provided on the top of the pressure head body 110, and the annular lug 116 is rectangular. The mounting seat 130 is also rectangular. The connecting shafts 160 include four. The four connecting shafts 160 pass through the four corners of the annular lug 116 respectively, and then are fixedly connected to the mounting seat 130. The four connecting shafts 160 are respectively covered with springs 170.

[0047] This embodiment also provides a laser welding device, including a welding head 100 as described above.

[0048] The laser welding device includes the same structure and benefits as the welding head 100 in the previous embodiment. The structure and benefits of the welding head 100 have been described in detail in the previous embodiment and will not be repeated here.

[0049] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding pressure head, characterized in that: include: A pressure head body, wherein a first through cavity and an air dividing cavity surrounding the first through cavity are provided in the pressure head body, wherein the first through cavity is used for allowing laser to pass through, an air inlet passage is provided on the side of the pressure head body, wherein the air inlet passage is connected with the air dividing cavity, and a plurality of air dividing passages are provided at the bottom of the air dividing cavity, wherein the plurality of air dividing passages are evenly distributed around the first through cavity, and an end of the air dividing passage extends to the bottom of the pressure head body.

2. The welding pressure head according to claim 1, characterized in that: It also includes a sealing plate, a mounting groove is provided on the top of the pressure head body, the sealing plate is fixed in the mounting groove, the air dividing cavity is formed between the sealing plate and the mounting groove, and a second through cavity is also provided on the sealing plate, and the second through cavity is connected to the first through cavity.

3. The welding pressure head according to claim 2, characterized in that: It also includes a mounting seat, the pressure head body is slidably arranged on the mounting seat, and a third through cavity is arranged on the mounting seat. The first through cavity, the second through cavity and the third through cavity are connected in sequence and are coaxially arranged.

4. The welding pressure head according to claim 1, characterized in that: The two air intake passages are symmetrically distributed relative to the axis of the first through cavity.

5. The welding pressure head according to claim 1, characterized in that: The end of the air inlet passage located on the side of the pressure head body is provided with a quick connector, and the quick connector is used to be connected to a protective gas source.

6. The welding pressure head according to any one of claims 1 to 5, characterized in that It also includes an exhaust tube, the end of which is inserted into the pressure head body and communicated with the first through cavity, and the connecting end surface of the exhaust tube is in contact with the inner surface of the first through cavity.

7. The welding pressure head according to claim 6, characterized in that The first through cavity is tapered, and a cross-sectional area of ​​the first through cavity gradually decreases from the top of the pressure head body to the bottom of the pressure head body.

8. The welding pressure head according to claim 6, characterized in that: The exhaust cylinder includes a first exhaust cylinder and a second exhaust cylinder connected to the first exhaust cylinder, the axis of the second exhaust cylinder is perpendicular to the axis of the first through cavity, the axis of the first exhaust cylinder is parallel to the axis of the first through cavity, the connecting end surface of the second exhaust cylinder is fitted with the inner surface of the first through cavity, and the side wall of the second exhaust cylinder is fixed to the pressure head body by screws.

9. The welding pressure head according to any one of claims 1 to 5, characterized in that: It also includes a mounting seat, a connecting shaft is provided at the bottom of the mounting seat, the pressure head body is located below the mounting seat and is sleeved on the connecting shaft, the bottom of the pressure head body is abutted against the end surface of the connecting shaft, a spring is sleeved on the connecting shaft, and the opposite ends of the spring are respectively abutted against the mounting seat and the pressure head body.

10. A laser welding device, characterized in that: Comprising a welding pressure head as described in any one of claims 1 to 9.

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