Welding method and welding device for battery shell cover

Abstract

The invention discloses a welding method and a welding device for a battery shell cover, and belongs to the technical field of battery processing. The battery shell cover welding method comprises the steps that the side face periphery of a shell is clamped through a side face tool, and a cover plate is adsorbed through a top face tool; the cover plate and the shell are buckled, so that the shell surrounds the periphery of the cover plate; detecting the width of the gap between the shell and the cover plate through the hollow hole of the top surface tool; based on the detection result, the side face tool is adjusted until the gap width meets the target condition; the shell and the cover plate are subjected to spot welding through the hollowed-out hole of the top face tool; and after the top face tool is removed, the shell and the cover plate are fully welded. According to the technical scheme, the clamping mode of the shell and the cover plate is optimized, and the side face tool and the top face tool are located through the negative pressure suction cups, so that uniform distribution of assembly gaps can be achieved, and meanwhile the welding quality and the welding efficiency of the battery shell cover are improved.

Description

Technical Field

[0001] The present application belongs to the field of battery processing technology, and in particular relates to a welding method and a welding device for a battery shell cover. Background Art

[0002] The battery shell and cover are usually assembled and fixed by welding. In the related art, since the battery shell is thin and easy to deform, the upper and lower gaps between the shell and the cover are uncontrollable during assembly, and the clamp is tightened on one side during welding, which also leads to uneven distribution of assembly gaps. This unevenness is hidden by the step where the cover protrudes from the shell, making it difficult to determine the matching position of the shell cover, which in turn leads to low welding quality and welding efficiency, and there is room for improvement. Summary of the invention

[0003] The present application aims to at least solve the technical problems of poor welding quality and low welding efficiency in the related art. To this end, the present application proposes a welding method and a welding device for a battery shell cover, which can simultaneously improve the welding quality and welding efficiency of the battery shell cover.

[0004] In a first aspect, the present application provides a method for welding a battery case cover, comprising:

[0005] The outer periphery of the side of the shell is clamped by the side tooling, and the cover plate is adsorbed by the top tooling;

[0006] Buckling the cover plate and the shell so that the shell surrounds the outer circumference of the cover plate;

[0007] Detecting the gap width between the shell and the cover plate through the hollow hole of the top surface tooling;

[0008] Adjust the side tooling based on the detection result until the gap width meets the target condition;

[0009] spot welding the shell and the cover plate through the hollow holes of the top surface tooling;

[0010] After removing the top surface tooling, the shell and the cover plate are fully welded.

[0011] By optimizing the clamping method of the shell and the cover plate, and positioning the side tooling and the top tooling using the negative pressure suction cup, uniform distribution of the assembly gap can be achieved, while improving the welding quality and welding efficiency of the battery shell cover.

[0012] According to one embodiment of the present application, the side periphery of the housing is clamped by the side tooling, including:

[0013] The side tooling in multiple directions abuts against the side surfaces of the shell in multiple directions;

[0014] Each side surface of the shell is adsorbed by the negative pressure suction cups of each side tooling.

[0015] The multi-directional abutment of the side tooling and the adsorption of the first negative pressure suction cup can help the shell to remain stable and accurately positioned during the welding process, thereby improving the accuracy and reliability of welding, while helping to reduce human intervention and errors. In addition, the use of the first negative pressure suction cup can also reduce physical contact with the shell surface, helping to protect the appearance and performance of the shell.

[0016] According to an embodiment of the present application, the step of fastening the cover plate and the housing includes:

[0017] The cover plate is moved to the shell to surround the outer periphery of the cover plate through the top surface tooling, and the negative pressure suction cups of each of the side surface toolings keep adsorbing each side surface of the shell.

[0018] The top surface tooling can not only adsorb and position the cover plate before welding, but also play a role in moving and guiding during the fastening process. By precisely controlling the movement of the top surface tooling, the cover plate can be smoothly moved to a position corresponding to the shell to reduce deviation or misalignment during the fastening process and prepare for fastening with the shell.

[0019] According to one embodiment of the present application, the method of adsorbing the cover plate through the top surface tooling includes:

[0020] The top surface tooling is abutted against the top surface of the cover plate, and the pole on the cover plate is matched with the avoidance hole of the top surface tooling;

[0021] The top surface of the cover plate is adsorbed by the negative pressure suction cup of the top surface tooling.

[0022] By means of the adsorption function of the top surface tooling, the cover plate can be firmly positioned at a predetermined position in preparation for snapping with the shell. This non-contact positioning method also helps to reduce scratches and damage.

[0023] According to an embodiment of the present application, detecting the gap width between the housing and the cover plate through the hollow hole of the top surface tooling includes:

[0024] The gap width at each location between the shell and the cover plate is detected through a plurality of hollow holes, and the plurality of hollow holes are distributed in a ring-shaped manner and are spaced apart and correspond to the outer peripheral edge of the cover plate and the inner peripheral wall of the shell.

[0025] By utilizing the hollow hole of the top surface tooling and detecting the gap width between the shell and the cover plate through the detection mechanism, the influence of too large or too small gap on the welding effect and sealing can be reduced, thereby improving the assembly accuracy and welding quality before welding.

[0026] According to an embodiment of the present application, adjusting the side tooling based on the detection result until the gap width meets the target condition includes:

[0027] Based on the detection results at the plurality of hollow holes, the corresponding side tooling is adjusted until the detection results at the plurality of hollow holes are all within a target range.

[0028] According to the degree of excess of the gap width at each position, the adjustment amount of each side tooling is reasonably distributed, so that the overall gap width after adjustment can be uniform and meet the target conditions.

[0029] According to an embodiment of the present application, when there are multiple side toolings on the same side of the same end of the housing, adjusting the side toolings based on the detection results until the gap width meets the target condition includes:

[0030] Based on the detection results at each of the hollow holes, the side tooling corresponding to the hollow holes is adjusted until the detection results at the corresponding hollow holes are within a target range.

[0031] According to the degree of excess of the gap width at each position, the adjustment amount of each side tooling is reasonably distributed, so that the overall gap width after adjustment can be uniform and meet the target conditions.

[0032] According to an embodiment of the present application, the spot welding of the shell and the cover plate through the hollow holes of the top surface tooling includes:

[0033] Determine the spot welding track by visually identifying the positions of the plurality of hollow holes;

[0034] Based on the spot welding trajectory, the shell and the cover plate are spot welded.

[0035] Spot welding operations are accurately performed through the hollow holes of the top surface tooling to preliminarily fix the shell and the cover plate at several key positions, which helps to maintain the relative position of the shell and the cover plate stable during the subsequent full welding process, and can improve the accuracy and efficiency of welding, thereby improving the welding quality of the battery shell cover.

[0036] In a second aspect, the present application provides a welding device for welding a battery shell cover, comprising:

[0037] A plurality of side toolings are movably distributed outside the plurality of side surfaces of the shell and are used to clamp the side periphery of the shell;

[0038] A top surface tooling is movably arranged outside the top surface of the cover plate, and is used to adsorb the cover plate, and the top surface tooling has a hollow hole suitable for corresponding to the gap between the shell and the cover plate;

[0039] A detection mechanism, used for detecting the width of the gap between the shell and the cover plate through the hollow hole;

[0040] A spot welding mechanism, used for spot welding the shell and the cover plate through the hollow holes;

[0041] A full welding mechanism is used for fully welding the shell and the cover plate.

[0042] The welding device can improve the welding quality and production efficiency of the battery shell cover by integrating a plurality of the side tooling, the top surface tooling, the detection mechanism, the spot welding mechanism and the full welding mechanism.

[0043] According to one embodiment of the present application, the side tooling is provided with a first negative pressure suction cup; and the top surface tooling is provided with a second negative pressure suction cup.

[0044] The side tooling and the top tooling are both provided with the negative pressure suction cup, which can fix the shell and the cover plate in all directions, effectively reduce the movement and deformation during the welding process, and thus improve the stability of welding.

[0045] According to one embodiment of the present application, the top surface tooling is provided with a plurality of the hollow holes, which are distributed in a ring-shaped manner and are suitable for corresponding to the outer peripheral edge of the cover plate and the inner peripheral wall of the shell.

[0046] The top surface tooling can detect the gap width between the shell and the cover plate through a reasonable layout of the hollow holes, and can also spot weld the shell and the cover plate.

[0047] According to one embodiment of the present application, the same side surface of the same end of the shell is suitable for arranging a plurality of independently controlled side tools.

[0048] Arranging a plurality of independently controlled side toolings on the same side of the same end of the shell can improve welding accuracy and quality, reduce maintenance costs, and provide strong technical support for the manufacture of the battery shell cover.

[0049] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0051] Figure 1 is a flow chart of a welding method for a battery shell cover provided in an embodiment of the present application;

[0052] Figure 2 This is one of the exploded schematic diagrams of the battery case cover and the welding device provided in the embodiment of the present application;

[0053] Figure 3 It is a structural schematic diagram of a battery case cover and a side tooling provided in an embodiment of the present application;

[0054] Figure 4 It is a schematic diagram of the structure of the top surface tooling provided in an embodiment of the present application;

[0055] Figure 5 This is one of the structural schematic diagrams of the battery shell cover and the welding device provided in the embodiment of the present application;

[0056] Figure 6 This is the second structural schematic diagram of the battery shell cover and the welding device provided in the embodiment of the present application;

[0057] Figure 7 This is the third structural schematic diagram of the battery shell cover and the welding device provided in the embodiment of the present application;

[0058] Figure 8 This is the second exploded schematic diagram of the battery shell cover and the welding device provided in the embodiment of the present application.

[0059] Reference numerals:

[0060] Battery case cover 10;

[0061] Shell 101, cover plate 102, pole 103;

[0062] Welding device 20;

[0063] Side tooling 210, first negative pressure suction cup 211;

[0064] Top surface tooling 220, second negative pressure suction cup 221, hollow hole 222, avoidance hole 223;

[0065] Testing agency 230;

[0066] Spot welding mechanism 240;

[0067] Full welding mechanism 250. DETAILED DESCRIPTION

[0068] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals 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 only used to explain the present application, and cannot be understood as limiting the present application.

[0069] The present application aims to at least solve the technical problems of poor welding quality and low welding efficiency in the related art. To this end, the present application proposes a welding method and a welding device for a battery shell cover, which can simultaneously improve the welding quality and welding efficiency of the battery shell cover.

[0070] Reference below Figure 1-Figure 8 A welding method of the battery case cover 10 according to an embodiment of the present application is described.

[0071] like Figure 1 As shown, the welding method of the battery case cover 10 includes: step 110 , step 120 , step 130 , step 140 , step 150 and step 160 .

[0072] Step 110 : Clamp the outer circumference of the side of the shell 101 by the side tooling 210 , and adsorb the cover plate 102 by the top tooling 220 .

[0073] The welding of the battery shell cover 10 is a delicate and critical process, which has a significant impact on the sealing and structural strength of the battery shell 101. Using the side tooling 210 to precisely clamp the side periphery of the shell 101 can help the shell 101 remain stable during the welding process and reduce movement or deformation. At the same time, through the adsorption function of the top surface tooling 220, the cover plate 102 can be firmly positioned in a predetermined position to prepare for the snap fit with the shell 101. This non-contact positioning method also helps to reduce scratches and damage.

[0074] The cover plate 102 may be made of aluminum or steel, the shell 101 may be made of the same material as the cover plate 102, the pole 103 may be made of a metal with good electrical conductivity such as aluminum, steel or copper, the side tooling 210 and the top tooling 220 may be made of metal or hard non-metallic material, and they respectively clamp the shell 101 and the cover plate 102.

[0075] Step 120 : buckle the cover plate 102 and the shell 101 together so that the shell 101 surrounds the outer circumference of the cover plate 102 .

[0076] like Figure 2 As shown, the cover plate 102 is precisely fastened to the shell 101 so that the shell 101 surrounds the outer periphery of the cover plate 102 to form a preliminary sealing structure, wherein the fastening of the cover plate 102 and the shell 101 includes step 121: moving the cover plate 102 to the shell 101 surrounding the outer periphery of the cover plate 102 through the top surface tooling 220, and the negative pressure suction cups of each side tooling 210 keep adsorbing each side of the shell 101.

[0077] The top surface tooling 220 can not only adsorb and position the cover plate 102 before welding, but also play a role in moving and guiding during the fastening process. By precisely controlling the movement of the top surface tooling 220, the cover plate 102 can be smoothly moved to a position corresponding to the shell 101 to reduce deviation or misalignment during the fastening process and prepare for fastening with the shell 101.

[0078] After the cover 102 moves to the predetermined position, through further operation of the top surface tooling 220, such as slight pressure or rotation, the cover 102 can gradually contact the edge of the shell 101 and surround its periphery. During the movement of the cover 102, the first negative pressure suction cups 211 of the side tooling 210 continue to maintain adsorption on the sides of the shell 101, so that the edge of the cover 102 can fit tightly with the edge of the shell 101, which helps to reduce gaps or misalignment, thereby improving the accuracy and reliability of the snap fit.

[0079] Step 130 : Detect the gap width between the housing 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220 .

[0080] like Figure 4 and Figure 5 As shown, the gap width at each location between the housing 101 and the cover plate 102 is detected by a plurality of hollow holes 222 , and the plurality of hollow holes 222 are distributed in a ring-shaped manner and correspond to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the housing 101 .

[0081] After the cover plate 102 and the shell 101 are buckled together, the detection equipment can detect the gap width at various locations between the shell 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220. At the same time, the multiple hollow holes 222 on the top surface tooling 220 are designed to be distributed in a ring-shaped interval, and the multiple hollow holes 222 all correspond to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the shell 101, that is, each hollow hole 222 can detect the gap between the shell 101 and the cover plate 102 at that position, and the gap width between the shell 101 and the cover plate 102 can be detected from multiple angles and positions. This multi-point detection method helps to improve the accuracy and comprehensiveness of the detection.

[0082] During the detection process, the gap width data observed for each hollow hole 222 can be recorded and analyzed respectively. When the gap width at certain positions exceeds the preset range, the position and strength of the side tooling 210 or the top tooling 220 can be adjusted in time to make the gap width meet the target conditions.

[0083] It can be understood that by utilizing the hollow hole 222 of the top surface tooling 220 and detecting the gap width between the shell 101 and the cover plate 102 through the detection mechanism 230, the impact of too large or too small gap on welding effect and sealing can be reduced, thereby improving the assembly accuracy and welding quality before welding.

[0084] Step 140: Based on the detection result, adjust the side tooling 210 until the gap width meets the target condition.

[0085] like Figure 4 and Figure 5 As shown, based on the detection results at the plurality of hollow holes 222 , the corresponding side tooling 210 is adjusted until the detection results at the plurality of hollow holes 222 are all within the target range.

[0086] First, the gap width data detected by multiple hollow holes 222 are summarized, and then the summarized detection results are analyzed, and the difference between the gap width at each hollow hole 222 and the target range is compared to identify the position where the gap width exceeds the target range and the degree of the excess gap width, and then the adjustment direction is determined based on the analysis results and the adjustment amount is allocated.

[0087] When the gap width exceeds the target range by too much, the direction of the side tooling 210 is adjusted inward; when the gap width exceeds the target range by too little, the direction of the side tooling 210 is adjusted outward; at the same time, according to the degree of excess of the gap width at each position, the adjustment amount of each side tooling 210 is reasonably allocated to make the overall adjusted gap width uniform and meet the target conditions.

[0088] In addition, a gradual adjustment method is adopted, and re-testing is performed after each adjustment to reduce problems caused by excessive one-time adjustments. During the adjustment process, the changes in the gap width can also be monitored in real time to adjust the adjustment strategy or stop the adjustment in time.

[0089] After the adjustment is completed, the gap width between the housing 101 and the cover plate 102 is detected again through the hollow holes 222 of the top surface tooling 220 to confirm that the detection results at all the hollow holes 222 are within the target range.

[0090] Step 150 : spot welding the housing 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220 .

[0091] like Figure 4-Figure 6 As shown, spot welding is performed through the hollow holes 222 of the top surface tooling 220 to preliminarily fix the shell 101 and the cover plate 102 at several key positions, which helps to maintain the relative position of the shell 101 and the cover plate 102 stable during the subsequent full welding process.

[0092] Step 160 : After removing the top surface tooling 220 , fully weld the shell 101 and the cover plate 102 .

[0093] like Figure 7 As shown, after the spot welding operation is completed, the top surface tooling 220 is removed to facilitate subsequent full welding work. After the top surface tooling 220 is removed, the full welding mechanism 250 is used to fully weld the shell 101 and the cover plate 102 to completely weld the shell 101 and the cover plate 102 together and further enhance the strength and sealing of the welding. After the full welding is completed, the welding quality is comprehensively inspected.

[0094] In the related art, the battery shell 101 and the cover plate 102 are usually assembled and fixed by welding, but the clamp is tightened on one side during welding, resulting in uneven distribution of the assembly gap. The unevenness will be concealed by the step of the cover plate protruding from the shell, making it difficult to determine the matching position of the shell cover, which in turn leads to low welding quality and efficiency. The welding method of the battery shell cover 10 of the present application can reduce the tolerance of the shell cover assembly gap, and the gap after assembly can be identified and adjusted, and top welding can be performed. In addition, the battery cover plate 102 can remove the outer step to achieve weight reduction.

[0095] According to the welding method of the battery shell cover 10 provided in the embodiment of the present application, by optimizing the clamping method of the shell 101 and the cover plate 102, and using negative pressure suction cups for positioning the side tooling 210 and the top tooling 220, a uniform distribution of the assembly gap can be achieved, while improving the welding quality and welding efficiency of the battery shell cover 10.

[0096] In some embodiments, Figure 2 and Figure 3 As shown, step 110 , clamping the side periphery of the shell 101 by the side tooling 210 , may include: step 111 and step 112 .

[0097] Step 111 : Use the side tooling 210 in multiple directions to abut against the side surfaces of the housing 101 in multiple directions.

[0098] There are multiple side toolings 210, and the multiple side toolings 210 can cover multiple directions of the side of the shell 101, and stably abut the side of the shell 101 from different angles and positions, which helps to reduce the displacement or deformation of the shell 101 during the welding process.

[0099] Step 112 : Adsorbing each side surface of the shell 101 through the first negative pressure suction cups 211 of each side tooling 210 .

[0100] A first negative pressure suction cup 211 can be installed on each side tooling 210. Multiple first negative pressure suction cups 211 generate suction by connecting to a negative pressure source, such as a vacuum pump. When the first negative pressure suction cup 211 contacts the side of the shell 101, turning on the negative pressure source can generate negative pressure inside the first negative pressure suction cup 211, so that the shell 101 is firmly adsorbed on the tooling. This adsorption method can provide a stable clamping force and help reduce scratches and damage on the surface of the shell 101.

[0101] Through the multi-directional abutment of the side tooling 210 and the adsorption of the first negative pressure suction cup 211, the shell 101 can be kept stable and accurately positioned during the welding process, thereby improving the accuracy and reliability of welding, while helping to reduce human intervention and errors. In addition, the use of the first negative pressure suction cup 211 can also reduce physical contact with the surface of the shell 101, helping to protect the appearance and performance of the shell 101.

[0102] In some embodiments, Figure 2 and Figure 4 As shown, step 110 , adsorbing the cover plate 102 by the top surface tooling 220 , may include: step 113 and step 114 .

[0103] Step 113 : The top surface fixture 220 is abutted against the top surface of the cover plate 102 , and the pole 103 on the cover plate 102 is matched with the avoidance hole 223 of the top surface fixture 220 .

[0104] The top surface tooling 220 is provided with a contact surface matching the top surface of the cover plate 102 so that the top surface tooling 220 can stably contact the cover plate 102 during the adsorption process. When the top surface tooling 220 moves and contacts the top surface of the cover plate 102, the pole 103 on the cover plate 102 cooperates with the avoidance hole 223 of the top surface tooling 220 to make the top surface tooling 220 and the cover plate 102 in close contact.

[0105] Step 114 : The top surface of the cover plate 102 is sucked by the second negative pressure suction cup 221 of the top surface tooling 220 .

[0106] A plurality of second negative pressure suction cups 221 are installed on the top surface tooling 220, and the plurality of second negative pressure suction cups 221 are evenly distributed on the top surface tooling 220, and are connected to a negative pressure source, such as a vacuum pump, through connecting pipes to provide a stable adsorption force. When the top surface tooling 220 is in close contact with the cover plate 102, the negative pressure source is started to generate negative pressure inside the second negative pressure suction cups 221. Under the action of the negative pressure, the cover plate 102 is firmly adsorbed on the top surface tooling 220, thereby achieving stable positioning and fixation of the cover plate 102.

[0107] In some embodiments, Figure 4-Figure 6As shown, step 150 , spot welding the shell 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220 , includes step 151 and step 152 .

[0108] Step 151: Determine the spot welding trajectory by visually identifying the positions of the plurality of hollow holes 222 .

[0109] like Figure 5 As shown, the detection device may include a visual recognition system, which can capture the image of the surface of the top surface tooling 220, and process the collected image through an image processing algorithm, accurately identify the specific position and shape of the hollow hole 222, and calibrate the identified position of the hollow hole 222 with the welding coordinate system, so that subsequent spot welding operations can be performed according to a predetermined trajectory.

[0110] Step 152 : spot-welding the housing 101 and the cover plate 102 based on the spot-welding trajectory.

[0111] like Figure 6 As shown, after the spot welding trajectory is determined by the detection device, the spot welding mechanism 240 is started to perform the spot welding operation. The spot welding mechanism 240 automatically moves the welding gun or welding head according to the preset spot welding trajectory and performs spot welding at the predetermined welding point.

[0112] It can be understood that by accurately performing spot welding operations through the hollow holes 222 of the top surface tooling 220 , the accuracy and efficiency of welding can be improved, thereby improving the welding quality of the battery case cover 10 .

[0113] The present application also provides a welding device 20 for welding a battery shell cover 10. Figure 2-Figure 7 As shown, it includes: multiple side tooling 210, top tooling 220, a detection mechanism 230, a spot welding mechanism 240 and a full welding mechanism 250.

[0114] like Figure 2 As shown, multiple side tooling 210 can be movably distributed outside multiple sides of the shell 101, and is used to clamp the side periphery of the shell 101 to keep the position of the shell 101 stable during the welding process and reduce the impact of movement or deformation on the welding quality. The material of the side tooling 210 can be metal or hard non-metallic material, and has a certain rigidity and wear resistance to withstand the high temperature and mechanical stress during the welding process.

[0115] like Figure 4As shown, the top surface tooling 220 is movably arranged outside the top surface of the cover plate 102, and is used to adsorb the cover plate 102. The top surface tooling 220 has a hollow hole 222 suitable for corresponding to the gap between the shell 101 and the cover plate 102, so that the detection mechanism 230 and the spot welding mechanism 240 can accurately detect and operate. The top surface tooling 220 fixes the cover plate 102 by adsorption, which can keep the cover plate 102 in a stable position during the welding process. At the same time, the hollow hole 222 can enable the detection mechanism 230 and the spot welding mechanism 240 to act directly on the welding area, thereby improving the accuracy of welding.

[0116] like Figure 5 As shown, the detection mechanism 230 detects the gap width between the shell 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220. It can be a CCD, that is, a visual recognition system. In addition to being used to detect the assembly gap width, it can also identify the welding position and improve the welding quality of spot welding.

[0117] like Figure 6 As shown, the spot welding mechanism 240 spot welds the shell 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220. Spot welding is a fast and effective welding method, which is suitable for parts that require local welding such as the battery shell cover 10. The battery shell cover 10 is locally welded by spot welding to fix the position of the shell 101 and the cover plate 102, and full welding is also performed to achieve a sealed connection between the shell 101 and the cover plate 102.

[0118] like Figure 7 As shown, the full welding mechanism 250 is used to fully weld the shell 101 and the cover plate 102 after spot welding is completed. Full welding can further improve the strength and sealing of the welding and enhance the overall performance of the battery shell cover 10. The full welding mechanism 250 has a high welding speed and uniform welding quality to complete large-area welding work in a short time. At the same time, the full welding mechanism 250 also has a good cooling system to reduce the damage to the battery shell cover 10 caused by excessive temperature during the welding process.

[0119] It can be understood that the welding device 20 can improve the welding quality and production efficiency of the battery shell cover 10 by integrating multiple side tooling 210, top surface tooling 220, detection mechanism 230, spot welding mechanism 240 and full welding mechanism 250.

[0120] In some embodiments, Figure 2 and Figure 4 As shown, the side tooling 210 is provided with a first negative pressure suction cup 211 , and the top tooling 220 is provided with a second negative pressure suction cup 221 .

[0121] The side tooling 210 and the top tooling 220 are respectively provided with a first negative pressure suction cup 211 and a second negative pressure suction cup 221, which can enhance the clamping and fixing ability of the side tooling 210 on the shell 101 and the top tooling 220 on the cover plate 102, thereby improving the stability and accuracy during the welding process.

[0122] The first negative pressure suction cup 211 absorbs the side of the shell 101 by generating negative pressure, thereby reducing the movement or deformation of the shell 101 due to external force or internal stress during the welding process. The second negative pressure suction cup 221 absorbs the cover plate 102 by generating negative pressure, thereby keeping the position of the cover plate 102 stable during the welding process. The negative pressure suction cup is usually made of soft and high temperature resistant materials to reduce damage to the surface of the shell 101 during the welding process. It is more flexible and reliable than traditional mechanical clamping, and is suitable for battery shells 101 with complex shapes or variable sizes.

[0123] It is understandable that both the side tooling 210 and the top tooling 220 are provided with negative pressure suction cups, which can fix the shell 101 and the cover plate 102 in all directions, effectively reduce the movement and deformation during the welding process, and thus improve the stability of the welding.

[0124] In some embodiments, Figure 4 As shown, the top surface tooling 220 is provided with a plurality of hollow holes 222 , which are distributed in a ring-shaped manner and are suitable for corresponding to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the shell 101 .

[0125] The top surface tooling 220 has multiple hollow holes 222 for use by the detection mechanism 230 and the welding mechanism. The detection mechanism 230 detects the gap width between the shell 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220. The welding mechanism spot welds the shell 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220, and the second negative pressure suction cup 221 and the hollow holes 222 do not interfere with each other.

[0126] After the cover plate 102 and the shell 101 are buckled together, the detection equipment can detect the gap width at various locations between the shell 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220. At the same time, the multiple hollow holes 222 on the top surface tooling 220 are designed to be distributed in a ring-shaped interval, and the multiple hollow holes 222 all correspond to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the shell 101, that is, each hollow hole 222 can detect the gap between the shell 101 and the cover plate 102 at that position, and the gap width between the shell 101 and the cover plate 102 can be detected from multiple angles and positions. This multi-point detection method helps to improve the accuracy and comprehensiveness of the detection.

[0127] By performing spot welding through the hollow holes 222 of the top surface tooling 220, the shell 101 and the cover plate 102 can be initially fixed at several key positions, which helps to maintain the relative position of the shell 101 and the cover plate 102 stable during the subsequent full welding process. The hollow holes 222 on the top surface tooling 220 can also increase the air permeability and heat dissipation of the top surface tooling 220.

[0128] It is understandable that the top surface tooling 220 can detect the gap width between the shell 101 and the cover plate 102 through a reasonable layout of the hollow holes 222 , and can also spot weld the shell 101 and the cover plate 102 .

[0129] In some embodiments, Figure 2 and Figure 8 As shown, the side tooling 210 has a variety of structural forms, including but not limited to:

[0130] First, the same side surface at the same end of the housing 101 is suitable for arranging a single independently controlled side tooling 210 .

[0131] like Figure 2 As shown, a single independently controlled side tooling 210 is arranged on the same side to clamp the side periphery of the shell 101. This can keep the position of the shell 101 stable during welding and reduce the impact of movement or deformation on the welding quality. At this time, a plurality of first negative pressure suction cups 211 are provided on the single side tooling 210 on the same side of the same end of the shell 101 to evenly distribute the adsorption force on the side tooling 210.

[0132] Secondly, the same side surface at the same end of the housing 101 is suitable for arranging a plurality of independently controlled side toolings 210 .

[0133] like Figure 8 As shown, multiple independently controlled side tooling 210 are arranged on the same side. The clamping force of each independently controlled side tooling 210 can be flexibly adjusted according to the specific size of the shell 101 and welding requirements, which is helpful to optimize the welding trajectory, reduce welding deformation, and improve welding accuracy and consistency. It can also better adapt to battery shells 101 of different specifications and types, and improve the versatility and adaptability of welding equipment. At this time, the multiple side tooling 210 on the same side of the same end of the shell 101 corresponds one by one to the multiple first negative pressure suction cups 211, that is, the number of side tooling 210 on the same side of the same end of the shell 101 is the same as the first negative pressure suction cup 211.

[0134] Multiple independently controlled side tooling 210 can clamp and fix different parts of the shell 101 at the same time, thereby increasing the stability of the overall welding process. This multi-point fixing method helps to reduce welding defects caused by movement or deformation of the shell 101 during welding and improve welding quality.

[0135] It can be understood that arranging multiple independently controlled side tooling 210 on the same side of the same end of the shell 101 can improve welding accuracy and quality, reduce maintenance costs, and provide strong technical support for the manufacture of the battery shell cover 10.

[0136] In the case where there are multiple side toolings 210 on the same side of the same end of the housing 101, step 140: adjusting the side tooling 210 to a gap width that meets the target condition based on the detection result may include:

[0137] Based on the detection results at each hollow hole 222 , the side tooling 210 corresponding to the hollow hole 222 is adjusted until the detection result at the corresponding hollow hole 222 is within the target range.

[0138] By analyzing the gap width data detected by multiple hollow holes 222, the detection results are analyzed, and the difference between the gap width at each hollow hole 222 and the target range is compared. The position where the gap width exceeds the target range and the degree of the excess gap width can be identified, and then the adjustment direction is determined and the adjustment amount is allocated based on the analysis results.

[0139] The multiple side tooling 210 on the same side of the same end of the shell 101 divides the multiple hollow holes 222 into more groups, and the operation can be refined according to actual conditions. When the gap widths at different parts of the same side of the shell 101 are different, the side tooling 210 can be adjusted to improve the uniformity of the gap widths at different parts and reduce the differences in gap widths.

[0140] It is understandable that, according to the degree of excess of the gap width at each position, the adjustment amount of each side tooling 210 is reasonably distributed, so that the overall adjusted gap width can be uniform and meet the target conditions.

[0141] The embodiments of the present application are described in detail below.

[0142] In this embodiment, if Figure 2-Figure 7 As shown, the welding device 20 includes: a plurality of side tooling 210 , a top surface tooling 220 , a detection mechanism 230 , a spot welding mechanism 240 and a full welding mechanism 250 .

[0143] like Figure 1 As shown, the welding method of the battery case cover 10 includes: step 110 , step 120 , step 130 , step 140 , step 150 and step 160 .

[0144] Step 110 : Clamp the outer circumference of the side of the shell 101 by the side tooling 210 , and adsorb the cover plate 102 by the top tooling 220 .

[0145] Using the side tooling 210 to precisely clamp the side periphery of the shell 101 can help the shell 101 remain stable during the welding process and reduce movement or deformation. At the same time, through the adsorption function of the top surface tooling 220, the cover 102 can be firmly positioned in a predetermined position to prepare for snapping with the shell 101. This non-contact positioning method also helps to reduce scratches and damage.

[0146] Among them, Figure 2 and Figure 3 As shown, step 110 , clamping the side periphery of the shell 101 by the side tooling 210 , may include: step 111 and step 112 .

[0147] Step 111 : Use the side tooling 210 in multiple directions to abut against the side surfaces of the housing 101 in multiple directions.

[0148] There are multiple side toolings 210, and the multiple side toolings 210 can cover multiple directions of the side of the shell 101, and stably abut the side of the shell 101 from different angles and positions, which helps to reduce the displacement or deformation of the shell 101 during the welding process.

[0149] Step 112 : Adsorbing each side surface of the shell 101 through the first negative pressure suction cups 211 of each side tooling 210 .

[0150] A first negative pressure suction cup 211 can be installed on each side tooling 210. Multiple first negative pressure suction cups 211 generate suction by connecting to a negative pressure source, such as a vacuum pump. When the first negative pressure suction cup 211 contacts the side of the shell 101, turning on the negative pressure source can generate negative pressure inside the first negative pressure suction cup 211, so that the shell 101 is firmly adsorbed on the tooling. This adsorption method can provide a stable clamping force and help reduce scratches and damage on the surface of the shell 101.

[0151] Through the multi-directional abutment of the side tooling 210 and the adsorption of the first negative pressure suction cup 211, the shell 101 can be kept stable and accurately positioned during the welding process, thereby improving the accuracy and reliability of welding, while helping to reduce human intervention and errors. In addition, the use of the first negative pressure suction cup 211 can also reduce physical contact with the surface of the shell 101, helping to protect the appearance and performance of the shell 101.

[0152] like Figure 2 and Figure 4 As shown, step 110 , adsorbing the cover plate 102 by the top surface tooling 220 , may include: step 113 and step 114 .

[0153] Step 113 : The top surface fixture 220 is abutted against the top surface of the cover plate 102 , and the pole 103 on the cover plate 102 is matched with the avoidance hole 223 of the top surface fixture 220 .

[0154] The top surface tooling 220 is provided with a contact surface matching the top surface of the cover plate 102 so that the top surface tooling 220 can stably contact the cover plate 102 during the adsorption process. When the top surface tooling 220 moves and contacts the top surface of the cover plate 102, the pole 103 on the cover plate 102 cooperates with the avoidance hole 223 of the top surface tooling 220 to make the top surface tooling 220 and the cover plate 102 in close contact.

[0155] Step 114 : The top surface of the cover plate 102 is sucked by the second negative pressure suction cup 221 of the top surface tooling 220 .

[0156] A plurality of second negative pressure suction cups 221 are installed on the top surface tooling 220, and the plurality of second negative pressure suction cups 221 are evenly distributed on the top surface tooling 220, and are connected to a negative pressure source, such as a vacuum pump, through connecting pipes to provide a stable adsorption force. When the top surface tooling 220 is in close contact with the cover plate 102, the negative pressure source is started to generate negative pressure inside the second negative pressure suction cups 221. Under the action of the negative pressure, the cover plate 102 is firmly adsorbed on the top surface tooling 220, thereby achieving stable positioning and fixation of the cover plate 102.

[0157] Step 120 : buckle the cover plate 102 and the shell 101 together so that the shell 101 surrounds the outer circumference of the cover plate 102 .

[0158] like Figure 2 As shown, the cover plate 102 is precisely fastened to the shell 101 so that the shell 101 surrounds the outer periphery of the cover plate 102 to form a preliminary sealing structure, wherein the fastening of the cover plate 102 and the shell 101 includes step 121: moving the cover plate 102 to the shell 101 surrounding the outer periphery of the cover plate 102 through the top surface tooling 220, and the negative pressure suction cups of each side tooling 210 keep adsorbing each side of the shell 101.

[0159] The top surface tooling 220 can not only adsorb and position the cover plate 102 before welding, but also play a role in moving and guiding during the fastening process. By precisely controlling the movement of the top surface tooling 220, the cover plate 102 can be smoothly moved to a position corresponding to the shell 101 to reduce deviation or misalignment during the fastening process and prepare for fastening with the shell 101.

[0160] After the cover 102 moves to the predetermined position, through further operation of the top surface tooling 220, such as slight pressure or rotation, the cover 102 can gradually contact the edge of the shell 101 and surround its periphery. During the movement of the cover 102, the first negative pressure suction cups 211 of the side tooling 210 continue to maintain adsorption on the sides of the shell 101, so that the edge of the cover 102 can fit tightly with the edge of the shell 101, which helps to reduce gaps or misalignment, thereby improving the accuracy and reliability of the snap fit.

[0161] Step 130 : Detect the gap width between the housing 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220 .

[0162] like Figure 4 and Figure 5 As shown, the gap width at each location between the housing 101 and the cover plate 102 is detected by a plurality of hollow holes 222 , and the plurality of hollow holes 222 are distributed in a ring-shaped manner and correspond to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the housing 101 .

[0163] After the cover plate 102 and the shell 101 are buckled together, the detection equipment can detect the gap width at various locations between the shell 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220. At the same time, the multiple hollow holes 222 on the top surface tooling 220 are designed to be distributed in a ring-shaped interval, and the multiple hollow holes 222 all correspond to the outer peripheral edge of the cover plate 102 and the inner peripheral wall of the shell 101, that is, each hollow hole 222 can detect the gap between the shell 101 and the cover plate 102 at that position, and the gap width between the shell 101 and the cover plate 102 can be detected from multiple angles and positions. This multi-point detection method helps to improve the accuracy and comprehensiveness of the detection.

[0164] Step 140: Based on the detection result, adjust the side tooling 210 until the gap width meets the target condition.

[0165] like Figure 4 and Figure 5 As shown, when a single side tooling 210 is provided on the same side of the same end of the shell 101 , the corresponding side tooling 210 is adjusted based on the detection results at the multiple hollow holes 222 until the detection results at the multiple hollow holes 222 are all within the target range.

[0166] like Figure 4 and Figure 8 As shown, when there are multiple side tooling 210 on the same side of the same end of the shell 101, the side tooling 210 corresponding to the hollow hole 222 is adjusted based on the detection results at each hollow hole 222 until the detection results at the corresponding hollow hole 222 are within the target range.

[0167] First, the gap width data detected by multiple hollow holes 222 are summarized, and then the summarized detection results are analyzed, and the difference between the gap width at each hollow hole 222 and the target range is compared to identify the position where the gap width exceeds the target range and the degree of the excess gap width, and then the adjustment direction is determined based on the analysis results and the adjustment amount is allocated.

[0168] When the gap width exceeds the target range by too much, the direction of the side tooling 210 is adjusted inward; when the gap width exceeds the target range by too little, the direction of the side tooling 210 is adjusted outward; at the same time, according to the degree of excess of the gap width at each position, the adjustment amount of each side tooling 210 is reasonably allocated to make the overall adjusted gap width uniform and meet the target conditions.

[0169] In addition, a gradual adjustment method is adopted, and re-testing is performed after each adjustment to reduce problems caused by excessive one-time adjustments. During the adjustment process, the changes in the gap width can also be monitored in real time to adjust the adjustment strategy or stop the adjustment in time.

[0170] After the adjustment is completed, the gap width between the housing 101 and the cover plate 102 is detected again through the hollow holes 222 of the top surface tooling 220 to confirm that the detection results at all the hollow holes 222 are within the target range.

[0171] Step 150 : spot welding the housing 101 and the cover plate 102 through the hollow holes 222 of the top surface tooling 220 .

[0172] like Figure 4-Figure 6 As shown, spot welding is performed through the hollow holes 222 of the top surface tooling 220 to preliminarily fix the shell 101 and the cover plate 102 at several key positions, which helps to maintain the relative position of the shell 101 and the cover plate 102 stable during the subsequent full welding process.

[0173] Step 150 , spot welding the shell 101 and the cover plate 102 through the hollow hole 222 of the top surface tooling 220 , includes step 151 and step 152 .

[0174] Step 151: Determine the spot welding trajectory by visually identifying the positions of the plurality of hollow holes 222 .

[0175] like Figure 5 As shown, the detection device may include a visual recognition system, which can capture the image of the surface of the top surface tooling 220, and process the collected image through an image processing algorithm, accurately identify the specific position and shape of the hollow hole 222, and calibrate the identified position of the hollow hole 222 with the welding coordinate system, so that subsequent spot welding operations can be performed according to a predetermined trajectory.

[0176] Step 152 : spot-welding the housing 101 and the cover plate 102 based on the spot-welding trajectory.

[0177] like Figure 6 As shown, after the spot welding trajectory is determined by the detection device, the spot welding mechanism 240 is started to perform the spot welding operation. The spot welding mechanism 240 automatically moves the welding gun or welding head according to the preset spot welding trajectory and performs spot welding at the predetermined welding point.

[0178] Step 160 : After removing the top surface tooling 220 , fully weld the shell 101 and the cover plate 102 .

[0179] like Figure 7 As shown, after the spot welding operation is completed, the top surface tooling 220 is removed to facilitate subsequent full welding work. After the top surface tooling 220 is removed, the full welding mechanism 250 is used to fully weld the shell 101 and the cover plate 102 to completely weld the shell 101 and the cover plate 102 together and further enhance the strength and sealing of the welding. After the full welding is completed, the welding quality is comprehensively inspected.

[0180] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0181] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0182] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0183] In the description of the present application, “plurality” means two or more.

[0184] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0185] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0186] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0187] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for welding a battery shell cover, characterized in that: include: The outer periphery of the side of the shell is clamped by the side tooling, and the cover plate is adsorbed by the top tooling; Buckling the cover plate and the shell so that the shell surrounds the outer circumference of the cover plate; Detecting the gap width between the shell and the cover plate through the hollow hole of the top surface tooling; Adjust the side tooling based on the detection result until the gap width meets the target condition; spot welding the shell and the cover plate through the hollow holes of the top surface tooling; After removing the top surface tooling, the shell and the cover plate are fully welded.

2. The battery case cover welding method according to claim 1, characterized in that: The side periphery of the housing is clamped by the side tooling, comprising: The side tooling in multiple directions abuts against the side surfaces of the shell in multiple directions; Each side surface of the shell is adsorbed by the negative pressure suction cups of each side tooling.

3. The welding method of the battery case cover according to claim 2, characterized in that: The buckling of the cover plate and the housing comprises: The cover plate is moved to the shell to surround the outer periphery of the cover plate through the top surface tooling, and the negative pressure suction cups of each of the side surface toolings keep adsorbing each side surface of the shell.

4. The battery case cover welding method according to claim 1, characterized in that: The method of adsorbing the cover plate by the top surface tooling includes: The top surface tooling is abutted against the top surface of the cover plate, and the pole on the cover plate is matched with the avoidance hole of the top surface tooling; The top surface of the cover plate is adsorbed by the negative pressure suction cup of the top surface tooling.

5. The method for welding a battery case cover according to any one of claims 1 to 4, characterized in that: The detecting the gap width between the housing and the cover plate through the hollow hole of the top surface tooling comprises: The gap width at each location between the shell and the cover plate is detected through a plurality of hollow holes, and the plurality of hollow holes are distributed in a ring-shaped manner and are spaced apart and correspond to the outer peripheral edge of the cover plate and the inner peripheral wall of the shell.

6. The battery case cover welding method according to claim 5, characterized in that: The step of adjusting the side tooling based on the detection result until the gap width meets the target condition includes: Based on the detection results at the plurality of hollow holes, the corresponding side tooling is adjusted until the detection results at the plurality of hollow holes are all within a target range.

7. The battery case cover welding method according to claim 5, characterized in that: In the case where there are a plurality of side toolings on the same side of the same end of the housing, adjusting the side toolings based on the detection result until the gap width meets the target condition includes: Based on the detection results at each of the hollow holes, the side tooling corresponding to the hollow holes is adjusted until the detection results at the corresponding hollow holes are within a target range.

8. The battery case cover welding method according to claim 5, characterized in that: The step of spot welding the shell and the cover plate through the hollow holes of the top surface tooling comprises: Determine the spot welding track by visually identifying the positions of the plurality of hollow holes; Based on the spot welding trajectory, the shell and the cover plate are spot welded.

9. A welding device for welding a battery shell cover, characterized in that: include: A plurality of side toolings are movably distributed outside the plurality of side surfaces of the shell and are used to clamp the side periphery of the shell; A top surface tooling is movably arranged outside the top surface of the cover plate, and is used to adsorb the cover plate, and the top surface tooling has a hollow hole suitable for corresponding to the gap between the shell and the cover plate; A detection mechanism, used for detecting the width of the gap between the shell and the cover plate through the hollow hole; A spot welding mechanism, used for spot welding the shell and the cover plate through the hollow holes; A full welding mechanism is used for fully welding the shell and the cover plate.

10. The welding device according to claim 9, characterized in that: The side tooling is provided with a first negative pressure suction cup; the top surface tooling is provided with a second negative pressure suction cup.

11. The welding device according to claim 9 or 10, characterized in that: The top surface tooling is provided with a plurality of the hollow holes, which are distributed in a ring-shaped manner and are spaced apart and are suitable for corresponding to the outer peripheral edge of the cover plate and the inner peripheral wall of the shell.

12. The welding device according to claim 9 or 10, characterized in that: The same side surface of the same end of the shell is suitable for arranging a plurality of independently controlled side toolings.

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