Square aluminum shell anti-explosion piece welding device and welding method

Abstract

The invention discloses a welding device and method for an anti-explosion piece of a square aluminum shell. The welding device and method are used for welding the anti-explosion piece in an anti-explosion stepped hole of the square aluminum shell. The device comprises a rack, a limiting plate is arranged on the rack, an inner supporting plate is transversely installed on the limiting plate, the square aluminum shell is arranged on the outer side of the inner supporting plate in a sleeving mode, and one end of the square aluminum shell abuts against the limiting plate; an adsorption groove opposite to the anti-explosion sheet is formed in the inner supporting plate, and an adsorption channel communicated with the adsorption groove is formed in the inner supporting plate; a cooling channel is formed in the inner supporting plate, and circulating cooling gas is introduced into the cooling channel to cool the inner supporting plate. The welding device is simple in structure, the anti-explosion piece is limited through the negative pressure environment in the negative pressure groove, the inner supporting plate is cooled through the cooling channel, deformation of the anti-explosion piece and the square aluminum shell is reduced to a certain degree, and then the welding precision is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery processing equipment, and in particular to a square aluminum shell explosion-proof plate welding device and a welding method. Background Art

[0002] During the manufacturing and assembly process of square aluminum shell lithium batteries, laser welding technology is widely used. It is the main welding method for square power batteries. Laser welding has many advantages such as high energy density, good power stability, high welding precision, and easy system integration. It plays an irreplaceable role in the production process of square and round aluminum shell lithium batteries.

[0003] Laser welding machines use high-energy laser pulses to locally heat a tiny area of ​​a material. The energy from the laser radiation diffuses into the material through heat conduction, melting it and forming a specific molten pool. This is a new welding method, primarily designed for welding thin-walled materials and delicate parts. It can perform spot welding, butt welding, lap welding, and seal welding. It features a high aspect ratio, a narrow weld width, a small heat-affected zone, minimal deformation, fast welding speeds, and smooth, aesthetically pleasing welds. Post-weld treatment requires minimal or no treatment, resulting in high-quality welds free of pores, precise control, a small focused spot, high positioning accuracy, and ease of automation.

[0004] The explosion-proof disc of a lithium battery casing is soft and easily destroyed under certain pressure. This disc explodes first when abnormal internal pressure occurs in an aluminum-cased battery, ensuring the safety of the lithium battery casing and minimizing production risks. The quality of welding largely determines the lifespan and safety of the battery. During actual production welding, we found that the high temperatures generated during welding can cause deformation of the explosion-proof disc and the aluminum casing, affecting weld quality and leading to defects such as cold welds and uneven weld lines. Summary of the Invention

[0005] In order to solve the technical problems existing in the background technology, the present invention provides a square aluminum shell explosion-proof disk welding device and welding method.

[0006] The present invention provides a square aluminum shell explosion-proof disk welding device for welding the explosion-proof disk into the explosion-proof stepped hole of the square aluminum shell. The device includes a frame, a limit plate provided on the frame, an inner support plate transversely mounted on the limit plate, and the square aluminum shell is sleeved on the outer side of the inner support plate, with one end of the square aluminum shell contacting the limit plate.

[0007] The inner support plate is provided with an adsorption groove opposite to the explosion-proof disk, and the inner support plate is provided with an adsorption channel connected to the adsorption groove;

[0008] The inner support plate is provided with a cooling channel, and circulating cooling gas is introduced into the cooling channel to cool the inner support plate.

[0009] As a further optimization of the present application, the inner support plate is made of porous and air-permeable steel.

[0010] As a further optimization of the present application, the bottom of the square aluminum shell is spaced apart from the inner support plate, so that the gas in the cooling channel enters the gap through the pores of the porous and air-permeable steel, thereby providing a low-temperature environment for welding.

[0011] As a further optimization of the present application, the inner support plate is provided with an annular groove, which is located at the outer periphery of the adsorption groove and opposite to the welding seam between the explosion-proof sheet and the square aluminum shell, thereby further facilitating cooling and increasing the welding effect.

[0012] As a further optimization of the present application, the depth of the annular groove is greater than the depth of the adsorption groove.

[0013] As a further optimization of the present application, the inner support plate is provided with a first through hole and a second through hole, and a connecting pipe is installed on the side of the inner support plate away from the limiting plate, the connecting pipe connects the first through hole and the second through hole, and the connecting pipe, the first through hole and the second through hole form a cooling channel.

[0014] Optionally, the cooling gas is nitrogen.

[0015] As a further optimization of the present application, the upper pressing plate is installed on the rack through a lifting member, and the lifting member drives the upper pressing plate to lift to realize pressing or loosening of the top of the square aluminum shell.

[0016] As a further optimization of the present application, the lifting end of the lifting member is provided with an elastic block, and the upper pressing plate is installed on the elastic block, the upper pressing plate has a portion extending out of the elastic block, and the elastic block is located on one side of the square aluminum shell.

[0017] As a further optimization of the present application, the side pressing plate is installed on the rack through a telescopic member, and the telescopic member is used to drive the side pressing plate to move towards or away from the square aluminum shell to realize pressing or loosening of the square aluminum shell.

[0018] As a further optimization of the present application, the telescopic end of the telescopic member is provided with a mounting bracket, and the side pressing plate is installed on the mounting bracket, and the lifting member is installed on the mounting bracket, and when the side pressing plate is pressed against the square aluminum shell, the upper pressing plate is located directly above the square aluminum shell.

[0019] As a further optimized solution of the present invention, the end of the inner support plate away from the limiting plate is a guide portion, and the cross-sectional area of ​​the guide portion in the vertical direction gradually decreases from the side close to the limiting plate to the side away from the limiting plate.

[0020] A method for welding a square aluminum shell explosion-proof disk comprises the following steps:

[0021] S1: The square aluminum shell is placed on the outer side of the inner support plate, and the upper surface and outer side surface of the inner support plate are in contact with the inner top surface and side surface of the square aluminum shell;

[0022] S2. Place an explosion-proof disk in the explosion-proof stepped hole of the square aluminum shell;

[0023] S3. The negative pressure in the negative pressure channel absorbs the explosion-proof disk through the adsorption groove, and cooling gas is introduced into the cooling channel;

[0024] S4. Weld the explosion-proof disk to the square aluminum shell by welding equipment. Specifically, the explosion-proof disk can be welded to the square aluminum shell by laser welding.

[0025] Preferably, before step S2, the process further includes pressing the side surfaces of the square battery by means of side pressing plates, and pressing the upper surface of the square aluminum shell by means of an upper pressing plate.

[0026] In the present invention, the proposed square aluminum shell explosion-proof disk welding device and welding method have a simple structure. The explosion-proof disk is limited by the negative pressure environment in the negative pressure tank, and the inner support plate is cooled by the cooling channel, thereby reducing the deformation of the explosion-proof disk and the square aluminum shell to a certain extent, thereby ensuring the welding accuracy; further, the inner support plate is made of porous breathable steel to further increase the cooling effect, thereby ensuring the welding accuracy of the explosion-proof disk and the square aluminum shell.

[0027] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is the main view of the present invention;

[0030] Figure 3 This is a cross-sectional view of the inner support plate of the present invention;

[0031] Figure 4 This is a partial enlarged view of area A of the present invention;

[0032] In the figure: 1. Square aluminum shell; 10. Explosion-proof stepped hole; 2. Explosion-proof plate; 3. Frame; 4. Limiting plate; 40. Negative pressure through hole; 41. First connecting hole; 42. Second connecting hole; 5. Inner support plate; 50. Adsorption groove; 51. Adsorption channel; 52. Annular groove; 53. Guide part; 6. Cooling channel; 60. First through hole; 61. Second through hole; 62. Connecting pipe; 7. Upper pressure plate; 70. Groove; 8. Lifting member; 9. Elastic block; 11. Side pressure plate; 12. Telescopic member; 13. Mounting frame. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention, and are not to be construed as limiting the present invention.

[0034] like Figure 1 - Figure 4 The figure shows a square aluminum shell explosion-proof disk welding device. The top wall of the square aluminum shell 1 is provided with an explosion-proof stepped hole 10 for accommodating the explosion-proof disk 2. The side surface of the explosion-proof disk 2 is welded to the square aluminum shell 1.

[0035] It includes a frame 3, a limit plate 4 is provided on the frame 3, an inner support plate 5 is horizontally installed on the limit plate 4, the inner support plate 5 is installed at a distance from the bottom surface of the frame 3, a square aluminum shell 1 is sleeved on the outside of the inner support plate 5, and one end surface of the square aluminum shell 1 is in contact with the limit plate 4, and there is a gap between the inner side surface of the bottom of the square aluminum shell 1 and the bottom surface of the inner support plate 5;

[0036] An adsorption groove 50 is formed on the inner support plate 5, and the adsorption groove 50 is connected to an adsorption channel 51. The adsorption groove 50 is opposite to the burst-proof disk 2, and the adsorption channel 51 is connected to an external negative pressure device via a negative pressure pipe. Preferably, a valve for controlling the pressure is provided on the negative pressure pipe, so that the negative pressure of the adsorption groove 50 adsorbs the middle portion of the burst-proof disk 2, thereby positioning and adsorbing the burst-proof disk 2 to ensure the welding effect. Specifically, a negative pressure through hole 40 is formed on the limit plate 4, and the negative pressure through hole 40 is connected to the negative pressure channel, and the negative pressure pipe is connected to the negative pressure through hole 40.

[0037] There is a cooling channel 6 on the inner support plate 5, and the cooling channel 6 is connected to an air inlet pipe and an air outlet pipe. Cooling gas is introduced into the cooling channel 6 to cool the explosion-proof disk 2 and the square aluminum shell 1 during the welding process to ensure the welding effect. The cooling gas can be nitrogen. Specifically, the air inlet pipe can be connected to a bottle containing liquid nitrogen coolant.

[0038] Preferably, the inner support plate 5 is made of porous breathable steel, so that the gas in the cooling channel 6 can directly cool the square aluminum shell 1 through the holes on the inner support plate 5, and the cooling gas can enter the adsorption groove 50 to cool the explosion-proof plate 2, thereby ensuring the welding accuracy; and the negative pressure in the adsorption channel 51 causes the side wall and top of the inner support plate 5 to be adsorbed with the inner support plate 5, ensuring positioning during the welding process and increasing the welding accuracy.

[0039] Preferably, an annular groove 52 is opened on the inner support plate 5, and the annular groove 52 is located on the outer periphery of the adsorption groove 50, and the depth of the annular groove 52 is greater than the depth of the adsorption groove 50. The weld position between the explosion-proof disk 2 and the square aluminum shell 1 is located directly above the annular groove 52, further increasing the welding accuracy.

[0040] Specifically, to facilitate processing, a first through-hole 60 and a second through-hole 61 are formed on the inner support plate 5. A connecting pipe 62 is installed on the side of the inner support plate 5 away from the limiting plate 4. The connecting pipe 62 is a U-shaped pipe that connects the first through-hole 60 and the second through-hole 61 to form a cooling channel 6. A first connecting hole 41 is formed on the limiting plate 4 to communicate with the first through-hole 60, and a second connecting hole 42 is formed on the limiting plate 4 to communicate with the second through-hole 61. A first connecting member is installed on the first connecting hole 41, and a second connecting member is installed on the second connecting hole 42. The first connecting member is connected to the air inlet pipe, and the second connecting member is connected to the air outlet pipe.

[0041] Preferably, in order to increase the welding accuracy, an upper pressure plate 7 is installed on the frame 3 through a lifting member 8. The lifting member 8 drives the upper pressure plate 7 to rise and fall to achieve the pressing or loosening of the top of the square aluminum shell 1, thereby increasing the stability during the welding process. The lifting member 8 can be an electric cylinder or a pneumatic cylinder in the prior art that can drive the plate-like structure to move in the vertical direction. In this embodiment, the lifting member 8 is an electric cylinder.

[0042] Specifically, there are two groups of lifting members 8 and upper pressure plates 7. One group of upper pressure plates 7 is installed at the lifting end of a lifting member 8. A groove 70 is opened on the upper pressure plate 7. The groove 70 is located on the outer periphery of the explosion-proof plate 2, thereby facilitating the welding of the explosion-proof plate 2 while ensuring the limitation of the square aluminum shell 1.

[0043] Preferably, a side pressure plate 11 is mounted on the frame 3 via a telescopic member 12. The telescopic member 12 drives the side pressure plate 11 to move laterally to tighten or loosen the side of the square aluminum shell 1, further positioning the square aluminum shell 1 during the welding process, thereby increasing welding accuracy. Preferably, two sets of telescopic members 12 and side pressure plates 11 are provided, one set of side pressure plates 11 is mounted on the other set of telescopic members 12, and the two sets of side pressure plates 11 are located on both sides of the square aluminum shell 1. The two sets of side pressure plates 11 are opposite each other, thereby increasing the stability of the fixation of the square aluminum shell 1 and increasing welding accuracy.

[0044] It should be noted that the telescopic member 12 may be an electric cylinder or a pneumatic cylinder in the prior art, which can drive a component to move horizontally. In this embodiment, the telescopic member 12 is an electric cylinder.

[0045] In some embodiments, preferably, a mounting bracket 13 is fixed to the telescopic end of the telescopic member 12. The mounting bracket 13 is slidably mounted on the fixed end of the telescopic member 12. The side pressure plate 11 is mounted on the mounting bracket 13. The lifting member 8 is mounted on the mounting bracket 13, thereby further facilitating the positioning and installation of the square aluminum shell 1. A group of lifting members 8 are mounted on one mounting bracket 13.

[0046] Preferably, an elastic block 9 is installed at the lifting end of the lifting member 8 , and the upper pressing plate 7 is installed on the elastic block 9 . The upper pressing plate 7 has a portion extending from the elastic block 9 , and the elastic block 9 is located on one side of the square aluminum shell 1 .

[0047] Specifically, the mounting frame 13 is an L-shaped structure, the side pressure plate 11 is installed on the side of the mounting frame 13, and the lifting member 8 is installed on the upper surface of the side pressure plate 11. When the upper pressure plate 7 presses the square aluminum shell 1 to weld the explosion-proof plate 2, the lifting member 8 is located above the fixed end of the telescopic member 12, thereby ensuring its overall stability.

[0048] Preferably, one end of the inner support plate 5 away from the limiting plate 4 is a guide portion 53 , and the thickness of the guide portion 53 gradually increases from the side away from the limiting plate 4 to the side close to the limiting plate 4 .

[0049] In order to better guide the square aluminum shell 1 , the height of the inner support plate 5 gradually increases from the side away from the limiting plate 4 to the side close to the limiting plate 4 .

[0050] During the welding process, the square aluminum shell 1 to be welded is placed on the outer side of the inner support plate 5, the upper surface of the inner support plate 5 contacts the inner top surface of the square aluminum shell 1, and the outer side surface of the square aluminum shell 1 contacts the outer side surface of the inner support plate 5. The telescopic member 12 drives the side pressure plate 11 to press against the side surface of the square aluminum shell 1, and the lifting member 8 drives the upper pressure plate 7 to move downward to press the top of the square aluminum shell 1;

[0051] An explosion-proof disc 2 is placed in the explosion-proof stepped hole 10;

[0052] The negative pressure in the negative pressure tank adsorbs the explosion-proof disc 2, and circulating cooling gas is introduced into the cooling channel 6. During the welding process, the cooling gas cools the inner support plate 5 and thus cools the explosion-proof disc 2 and the square aluminum shell 1.

[0053] It needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or it can simply mean that the first feature is higher than the second feature in horizontal height.

[0057] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can make equivalent replacement or change according to the technical solution and inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A square aluminum shell explosion-proof disc welding device, used for welding an explosion-proof disc (2) into an explosion-proof stepped hole (10) of a square aluminum shell (1), characterized in that: The invention comprises a frame (3), a limiting plate (4) is provided on the frame (3), an inner support plate (5) is transversely mounted on the limiting plate (4), the square aluminum shell (1) is sleeved on the outer side of the inner support plate (5), and one end of the square aluminum shell (1) is in contact with the limiting plate (4); The inner support plate (5) is provided with an adsorption groove (50) opposite to the explosion-proof plate (2), and the inner support plate (5) is provided with an adsorption channel (51) communicating with the adsorption groove (50); A cooling channel (6) is provided on the inner support plate (5), and circulating cooling gas is introduced into the cooling channel (6) to cool the inner support plate (5).

2. The square aluminum shell explosion-proof disk welding device according to claim 1 is characterized in that: The inner support plate (5) is made of porous breathable steel.

3. The square aluminum shell explosion-proof disk welding device according to claim 1 or 2, characterized in that: An annular groove (52) is formed on the inner support plate (5), the annular groove (52) being located on the outer periphery of the adsorption groove (50), and the annular groove (52) being opposite to the weld between the explosion-proof disk (2) and the square aluminum shell (1).

4. The square aluminum shell explosion-proof disk welding device according to claim 1, characterized in that: A first through hole (60) and a second through hole (61) are formed on the inner support plate (5); a connecting pipe (62) is installed on a side of the inner support plate (5) away from the limiting plate (4); the connecting pipe (62) connects the first through hole (60) and the second through hole (61); the connecting pipe (62), the first through hole (60) and the second through hole (61) form a cooling channel (6).

5. The square aluminum shell explosion-proof disk welding device according to claim 1, characterized in that: An upper pressing plate (7) is mounted on the frame (3) via a lifting member (8), and the lifting member (8) drives the upper pressing plate (7) to move up and down to achieve compression or loosening of the top of the square aluminum shell (1).

6. The square aluminum shell explosion-proof disk welding device according to claim 5, characterized in that: An elastic block (9) is installed at the lifting end of the lifting member (8), the upper pressing plate (7) is installed on the elastic block (9), the upper pressing plate (7) has a portion extending from the elastic block (9), and the elastic block (9) is located on one side of the square aluminum shell (1).

7. The square aluminum shell explosion-proof disk welding device according to claim 5, characterized in that: A side pressure plate (11) is mounted on the frame (3) via a telescopic member (12), and the telescopic member (12) is used to drive the side pressure plate (11) to move toward or away from the square aluminum shell (1) to achieve compression or loosening of the square aluminum shell (1).

8. The square aluminum shell explosion-proof disk welding device according to claim 7, characterized in that: A mounting frame (13) is installed at the telescopic end of the telescopic member (12), the side pressure plate (11) is installed on the mounting frame (13), and the lifting member (8) is installed on the mounting frame (13).

9. The square aluminum shell explosion-proof disk welding device according to claim 1, characterized in that: One end of the inner support plate (5) away from the limiting plate (4) is a guide portion (53), and the cross-sectional area of ​​the guide portion (53) in the vertical direction gradually decreases from the side close to the limiting plate (4) to the side away from the limiting plate (4).

10. A square aluminum shell explosion-proof disk welding method, characterized in that: The steps include: S1: The square aluminum shell (1) is placed on the outer side of the inner support plate (5), and the upper surface and outer side surface of the inner support plate (5) are in contact with the inner top surface and side surface of the square aluminum shell (1); S2. Place an explosion-proof disc (2) in the explosion-proof stepped hole (10) of the square aluminum shell (1); S3, the negative pressure in the negative pressure channel adsorbs the explosion-proof disk (2) through the adsorption groove (50), and cooling gas is introduced into the cooling channel (6); S4. Weld the explosion-proof disk (2) to the square aluminum shell (1) using welding equipment.

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