Pre-welding apparatus and control method

Abstract

The application relates to the technical field of battery processing, and discloses a pre-welding device and a control method. The pre-welding device comprises a nail placing device and a cover placing device. The nail placing device is used for placing a sealing nail to one end of a cylindrical battery having a liquid injection hole. The cover placing device is located upstream of the nail placing device and is used for placing a protective cover on the one end of the cylindrical battery having the liquid injection hole. The protective cover is configured as an insulating material piece, is arranged on the cylindrical battery, and has a avoiding hole opposite to the liquid injection hole. Thus, by arranging the cover placing device and locating the cover placing device upstream of the nail placing device, the installation of the protective cover can be completed before the nail is placed, so that insulation protection can be completed before subsequent processing of the cylindrical battery in the pre-welding device, the risk of short circuit of the cylindrical battery in the subsequent processing process is reduced, and the processing safety and reliability of the pre-welding device are improved.

Description

Technical Field

[0001] This application relates to the field of battery processing technology, and in particular to a pre-welding device and control method. Background Technology

[0002] In related technologies, during the production of cylindrical batteries, sealing pins need to be welded onto the injection holes to seal them. However, the close proximity of the positive and negative electrodes poses a risk of short circuits due to the sealing pins causing them to overlap, resulting in significant safety hazards during the production of cylindrical batteries. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, one objective of this application is to provide a pre-welding device that can prevent positive and negative electrode overlap caused by sealing pins, thereby improving safety and reliability.

[0004] This application further proposes a control method for the aforementioned pre-welding equipment.

[0005] In a first aspect, this application proposes a pre-welding device, comprising: a pin-attaching device and a cover device. The pin-attaching device is used to place a sealing pin onto one end of a cylindrical battery having an injection hole. The cover device is located upstream of the pin-attaching device and is used to cover the cylindrical battery with a protective cover at the end having the injection hole.

[0006] The protective cover is made of insulating material and is placed over the cylindrical battery. The protective cover has a clearance hole opposite to the liquid filling hole.

[0007] According to the pre-welding equipment of this application embodiment, by setting an upper cover device and placing the upper cover device upstream of the nailing device, the installation of the protective cover can be completed before nailing, so as to ensure that the cylindrical battery can be insulated and protected before subsequent processing in the pre-welding equipment, thereby reducing the risk of short circuit in the cylindrical battery during subsequent processing and improving the processing safety and reliability of the pre-welding equipment.

[0008] According to some embodiments of this application, the pre-welding equipment further includes: a magnetic drive conveyor belt, on which a mover is disposed, the mover being movably disposed on the magnetic drive conveyor belt, the mover having a carrier, and a cylindrical battery disposed on the carrier.

[0009] In the above technical solution, the magnetic drive conveyor belt drives the mover to move the carrier synchronously, which can not only increase the turnover speed of cylindrical batteries, but also speed up the production cycle and improve production efficiency. It can also improve the transportation accuracy, so that the cylindrical batteries can be moved to the position of each device with higher accuracy. Higher accuracy can also improve production efficiency, processing accuracy and processing quality.

[0010] Of course, using magnetic drive conveyor belts for transporting cylindrical batteries can also reduce the difficulty of layout based on the high flexibility of magnetic drive conveyor belts, adapt to various space requirements, realize the overall compact setting of pre-welding equipment, reduce space occupation, and make maintenance simpler and more convenient. The downtime after failure is shorter, which can further improve production efficiency and reduce maintenance and upkeep costs.

[0011] According to some embodiments of this application, the carrier includes: a partition, connecting plates located on both sides of the partition, and a clamp, the clamp being used to fix the cylindrical battery, and the connecting plates being connected to the mover.

[0012] In the above technical solution, on the one hand, it can make the disassembly and assembly between the carrier and the stator easier. On the other hand, the clamps and connecting plates are located on both sides of the separator, which can reduce the probability of interference with surrounding components during the positioning of the cylindrical battery and improve the stability and reliability of the carrier for bearing the cylindrical battery.

[0013] According to some embodiments of this application, a positioning pin is provided on the connecting plate, a protective cover is detachably disposed on the positioning pin, and the upper cover device is adapted to switch between a first position and a second position. In the first position, the upper cover device is adapted to remove the protective cover by the positioning pin, and in the second position, the upper cover device is adapted to install the protective cover onto the cylindrical battery located in the clamp.

[0014] In the above technical solution, the protective cover is positioned and fixed by the positioning pin, which can reduce the probability of the protective cover falling off. Before the upper cover device puts on the protective cover, the protective cover can be fixed by the positioning pin. After the lower cover device puts on the protective cover, the protective cover can be placed on the positioning pin. On the one hand, the setting of the positioning pin can reduce the risk and probability of the protective cover falling off. On the other hand, it can realize the recycling of the protective cover and improve the convenience of taking the protective cover off.

[0015] According to some embodiments of this application, the cover device includes: a first drive group and a cover clamp, the first drive group being used to drive the cover clamp to switch between a first position and a second position, the cover clamp being adapted to pick up the protective cover.

[0016] In the above technical solution, the first drive group drives the first clamp to realize the removal of the protective cover on the positioning pin and the installation on the cylindrical battery, which can simplify the structure of the cover device and make the removal and installation of the protective cover of the cover device more accurate.

[0017] According to some embodiments of this application, a first elastic buffer structure is provided between the first drive group and the upper cover clamp, so that the upper cover clamp is elastically connected to the first drive group.

[0018] In the above technical solution, during the process of the upper cover clamp descending to the positioning pin to pick up the protective cover, or descending to the end of the cylindrical battery with the liquid injection hole to place the protective cover, the upper cover clamp can avoid overpressure that could damage the protective cover, positioning pin, cylindrical battery or upper cover clamp. This can not only extend the service life of the carrier and the upper cover device, but also prevent damage to the cylindrical battery, thereby improving the processing reliability and stability of the pre-welding equipment.

[0019] According to some embodiments of this application, the pre-welding equipment further includes a pre-welding device and a lower cover device, wherein the pre-welding device and the lower cover device are arranged sequentially downstream of the upper nail device, and the pre-welding device is used to pre-weld the sealing nails, and the lower cover device is used to remove the protective cover on the cylindrical battery.

[0020] In the above technical solution, the upper cover device, the upper nailing device, the pre-welding device, and the lower cover device are sequentially arranged on the flow path of the cylindrical battery in the pre-welding equipment. This ensures that the protective cover is applied before nailing and the protective cover is applied after pre-welding. This ensures that even if the sealing nail is mispositioned, poorly welded, or even moves during the nailing and pre-welding processes, it will not cause a short circuit in the cylindrical battery. This further improves the safety of the pre-welding equipment and reduces safety hazards.

[0021] According to some embodiments of this application, the lower cover device is adapted to switch between a third position and a fourth position, wherein in the third position, the lower cover device is adapted to remove the protective cover from the cylindrical battery, and in the fourth position, the lower cover device is adapted to place the protective cover onto the locating pin.

[0022] In the above technical solution, the upper cover device and the lower cover device can be switched between two positions in a straight line at least in part (upper cover clamp and lower cover clamp) to realize the picking and placing of the protective cover, which can improve the convenience of picking and placing the protective cover and make the picking and placing of the protective cover more accurate.

[0023] According to some embodiments of this application, the lower cover device includes: a second drive group and a lower cover clamp, the second drive group being used to drive the lower cover clamp to switch between a third position and a fourth position, and the lower cover clamp being adapted to pick up the protective cover.

[0024] In the above technical solution, the second drive group drives the second clamp to realize the placement of the protective cover on the positioning pin and the removal of the cylindrical battery. This simplifies the structure of the lower cover device and makes the removal and installation of the protective cover of the lower cover device more accurate.

[0025] According to some embodiments of this application, the lower cover clamp is further provided with a material rejection part, which is used to adsorb the sealing nails located on the cylindrical battery when the lower cover clamp is in the third position.

[0026] In the above technical solution, the material removal part can be constructed as a suction nozzle. The material removal part is located on the lower cover fixture and is suitable for adsorbing the sealing nails located on the cylindrical battery. The cylindrical battery transferred from the pre-welding device to the unloading device will have its sealing nail adsorbed once during the process of lowering the protective cover. The sealing nails pre-welded to the end cover of the cylindrical battery will not fall off during the adsorption process, while the missing sealing nails can be removed by the action of the material removal part. That is, the missing sealing nails can be removed at the same time as the protective cover is lowered. This not only reduces material waste, but also avoids the missing sealing nails from being transferred to the corresponding cylindrical battery in the same way as the battery and causing a short circuit in the subsequent process. This eliminates the safety hazards caused by the missing sealing nails, further improves the safety of the pre-welding equipment, makes the safety of subsequent processes higher, and improves the final cylindrical battery product quality.

[0027] According to some embodiments of this application, a second elastic buffer structure is provided between the second drive group and the lower cover clamp, so that the lower cover clamp is elastically connected to the second drive group.

[0028] In the above technical solution, during the process of the lower cover clamp descending to the positioning pin to place the protective cover, or descending to the end of the cylindrical battery with the liquid injection hole to remove the protective cover, the lower cover clamp can avoid overpressure that could damage the protective cover, positioning pin, cylindrical battery, or upper cover clamp. This not only extends the service life of the carrier and the lower cover device, but also avoids damage to the cylindrical battery, thereby improving the processing reliability and stability of the pre-welding equipment.

[0029] According to some embodiments of this application, the pre-welding equipment further includes: a feeding device, a discharging device, and a detection device. The feeding device is located upstream of the upper cover device and is used to supply the cylindrical battery to the mover of the magnetic drive conveyor belt. The discharging device and the detection device are arranged sequentially downstream of the lower cover device. The detection device is used to detect the pre-welding quality of the sealing nails on the cylindrical battery, and the discharging device is used to remove the cylindrical battery.

[0030] The above technical solution ensures that the cylindrical battery will not short-circuit during the nailing process, and the battery will only flow out of the pre-welding equipment after pre-welding is completed. This ensures the insulation protection of the cylindrical battery. That is, before the sealing nail is welded, the upper protective cover provides effective insulation protection for the inside of the battery, avoiding damage to the cylindrical battery due to current leakage or short circuit during the welding process, and ensuring the safety and welding quality of the cylindrical battery.

[0031] The visual guidance function before nailing ensures that pre-welding is only performed when the protective cover is correctly installed. This reduces welding failures or safety hazards caused by missing protective covers, improving the controllability and safety of the production process. Pre-welding point offset detection or alarms before material handling can promptly identify and address potential problems during welding, preventing defective products from entering subsequent processes and further ensuring battery consistency and reliability.

[0032] Secondly, this application proposes a control method for a pre-welding device, the control method including: installing a protective cover onto a cylindrical battery before nailing.

[0033] According to the control method of the pre-welding equipment in the embodiments of this application, the protective cover can be installed on the cylindrical battery before the nail is attached, thereby ensuring that the cylindrical battery has a lower probability of current leakage and short circuit during subsequent processing in the pre-welding equipment, thus improving the safety and reliability of the pre-welding equipment in the cylindrical battery processing process.

[0034] According to some embodiments of this application, the control method further includes: removing the protective cover from the cylindrical battery after pre-soldering.

[0035] In the above technical solution, the control method of this application embodiment is based on the processing of the pre-welding equipment. The protective cover is removed only after the pre-welding is completed. This ensures that the sealing nail is in the position of the liquid injection hole of the cylindrical battery and is pre-fixed. After the sealing nail will not move, the protective cover will be removed. This can ensure that insulation protection is achieved through the protective cover during the processing when the sealing nail may be displaced. In the processing when no further protection is needed, the protective cover can be removed in time. Under the premise of ensuring insulation protection of the cylindrical battery, the protective cover can be reused.

[0036] According to some embodiments of this application, the control method further includes: feeding the cylindrical battery to the mover before the protective cover is installed on the cylindrical battery; and unloading the cylindrical battery from the pre-welding equipment after the protective cover is removed from the cylindrical battery.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 This is a schematic diagram of a pre-welding device according to an embodiment of this application;

[0040] Figure 2This is a schematic diagram of a vehicle according to an embodiment of this application;

[0041] Figure 3 This is a schematic diagram of a protective cover according to an embodiment of this application;

[0042] Figure 4 This is a schematic diagram of the cover device according to an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the cover clamp and the first elastic buffer structure of the cover device according to an embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the lower cover device according to an embodiment of this application;

[0045] Figure 7 This is a schematic diagram of the lower cover clamp and the second elastic buffer structure of the lower cover device according to an embodiment of this application;

[0046] Figure 8 This is a schematic diagram of a pre-welding device according to an embodiment of this application;

[0047] Figure 9 This is a schematic diagram of the positioning assembly of the pre-welding device according to an embodiment of this application;

[0048] Figure 10 This is a schematic diagram of a positioning cover plate according to an embodiment of this application;

[0049] Figure 11 This is a schematic diagram of a stapler according to an embodiment of this application;

[0050] Figure 12 This is a cross-sectional schematic diagram of the stapling component according to an embodiment of this application;

[0051] Figure 13 This is a control flowchart of the pre-welding equipment according to an embodiment of this application;

[0052] Figure 14 This is a flowchart illustrating the positioning of the positioning component of the pre-welding device according to an embodiment of this application.

[0053] Figure label:

[0054] Pre-welding equipment 100, protective cover 200,

[0055] Upper nail device 10,

[0056] Top cover assembly 20, first drive group 21, top cover clamp 22, first elastic buffer structure 23, first plate 24

[0057] Magnetic drive conveyor belt 30, mover 31, carrier 32, partition 321, connecting plate 322, positioning pin 3221, clamp 323, support plate 3231, first positioning part 3232, second positioning part 3233.

[0058] The components include: pre-welding device 40, positioning assembly 41, mounting bracket 411, positioning cover plate 412, welding through hole 4121, receiving groove 4122, lifting component 413, cylinder 4131, push rod 4132, pressure nail component 414, connecting block 4141, clearance hole 41411, pressure rod 4142, connecting arm 41421, extension arm 41422, pressure nail part 41423, pressure nail rod 41424, pressure block 41425, first elastic element 41426, pre-welding assembly 42, galvanometer motion triaxial 421, pre-welded galvanometer 422, and pre-welded vision guidance camera 423.

[0059] First drive unit 401, first slide rail 402, first slider 403.

[0060] Second drive unit 404, second slide rail 405, second slider 406.

[0061] Lower cover assembly 50, second drive group 51, lower cover clamp 52, second elastic buffer structure 53, material rejection part 54, second plate 55.

[0062] Feeding device 60, unloading device 70, detection device 80. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0065] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0066] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0069] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0070] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0071] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0072] In this application, "multiple" means two or more (including two).

[0073] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0074] The battery processed in this embodiment is a cylindrical battery. The cylindrical battery includes a cylindrical housing, an end cap, and an electrode assembly. The housing defines an accommodating space with an installation opening. The electrode assembly and an insulating cover are disposed inside the housing, and the installation opening is sealed by the end cap.

[0075] For example, the housing is generally cylindrical and open at one axial end to form an accommodating space with an installation port. Electrode components and other functional components such as insulating covers can be installed in the accommodating space. The end cap is closed on the installation port of the housing to isolate the internal environment of the cylindrical battery cell from the external environment. The shape of the end cap is adapted to the shape of the housing. The end cap can be supported by a material with a certain hardness and strength (such as aluminum alloy or carbon fiber plate). The end cap can effectively protect the safety and reliability of the internal components of the housing when squeezed or impacted.

[0076] In some embodiments, the end cap may also be provided with a pressure relief device for releasing internal pressure when the internal pressure or temperature of the cylindrical battery cell reaches a threshold. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0077] In some embodiments, an insulating cover may be provided inside the end cap. The insulating cover can be used to isolate the electrical connection components inside the housing from the end cap to reduce the risk of short circuits. For example, the insulating cover may be made of plastic, rubber, etc., to achieve insulation protection.

[0078] The housing is an assembly used to fit with the end cap to form the internal environment of a cylindrical battery cell. This internal environment can accommodate electrode components, electrolyte, and other parts. The housing and end cap can be separate components. A mounting opening can be provided on the housing, and the end cap closes the opening at the mounting opening to form the internal environment of the cylindrical battery cell. The housing can be cylindrical in shape.

[0079] Electrode assemblies are the components in a cylindrical battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. An electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends. During the charging and discharging process of the cylindrical battery device, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0080] It should be noted that the manufacturing process of a cylindrical battery includes at least the following: preparation of electrode components, cylindrical battery packaging, and cylindrical battery testing. Cylindrical battery packaging includes multiple steps such as inserting electrode components into the casing, welding the tabs to the output terminals after casing, injecting electrolyte into the cylindrical battery, formation after electrolyte injection, and sealing the injection hole.

[0081] Understandably, after the electrolyte filling is completed, the cylindrical battery is charged, and at this time the electrolyte filling hole is open, waiting to be sealed. Sealing the electrolyte filling hole is a key process for isolating the internal space of the casing from the external environment. The electrolyte filling hole is located on the end cap, which can simultaneously lead out the positive and negative terminals of the cylindrical battery, or the casing can serve as the negative terminal, and the end cap can lead out the positive terminal separately. The sealing nail is generally an aluminum nail. The distance between the positive and negative terminals of the cylindrical battery is very close. When the sealing nail is welded on the end cap, if there is a positional deviation, it may cause the negative and positive terminals to overlap, causing a short circuit and posing a safety hazard.

[0082] Based on this, this application proposes a pre-welding device. The pre-welding device can use a cover device located upstream of the top nail device to install a protective cover onto the end of the cylindrical battery before the top nail device places the sealing nail into the liquid injection hole of the cylindrical battery. This can separate the casing from the sealing nail. Even if the sealing nail has a positioning deviation, the protective cover can still separate the sealing nail from the casing, thereby reducing the probability of the sealing nail causing the positive and negative electrodes of the cylindrical battery to overlap. This reduces the probability of short circuit in the cylindrical battery during the pre-welding process, thereby reducing safety hazards and improving the safety and reliability of the pre-welding device.

[0083] First, based on Figures 1-9 as well as Figure 13 The pre-welding process of the pre-welding equipment 100 in the embodiments of this application will be described in detail.

[0084] The pre-welding equipment 100 includes: a magnetic drive conveyor belt 30, a feeding device 60, an upper cover device 20, an upper nailing device 10, a pre-welding device 40, a lower cover device 50, a detection device 80, and an unloading device 70, which are arranged sequentially from upstream to downstream on the magnetic drive conveyor belt 30 according to the flow path of the cylindrical battery in the pre-welding equipment 100.

[0085] The magnetic drive conveyor belt 30 defines a straight or circular flow path for the cylindrical batteries within the pre-welding equipment 100. A mover 31 can be mounted on the magnetic drive conveyor belt 30, and a carrier 32 can be mounted on the mover 31. There can be multiple sets of carriers 32, and the number of sets of carriers 32 should be greater than or equal to the total number of devices (i.e., the sum of the number of feeding devices 60, upper cover devices 20, upper nail devices 10, pre-welding devices 40, lower cover devices 50, detection devices 80, and unloading devices 70) so that multiple devices on the pre-welding equipment 100 can work simultaneously. In embodiments where the number of carrier sets is greater than the total number of devices, at least one set of cylindrical batteries can be stored on the magnetic drive conveyor belt 30 as a buffer for the pre-welding equipment 100. Each set of carriers 32 has at least one carrier 32, and each carrier 32 is used to install and position one cylindrical battery.

[0086] The feeding device 60 is located at the beginning of the flow path of the cylindrical battery in the pre-welding equipment 100. The feeding device 60 can install the cylindrical battery onto the carrier 32.

[0087] The top cover device 20 is located downstream of the feeding device 60. The feeding device 60 can install the protective cover 200 to the end of the cylindrical battery with the liquid injection hole, so that the outer casing and the end cap forming the liquid injection hole are covered by the protective cover 200, and only the area where the liquid injection hole of the end cap is exposed.

[0088] The upper nail device 10 is located downstream of the upper cover device 20. The upper cover device 20 can place the sealing nail at the location of the liquid injection hole, and at this time the sealing nail can be isolated by the protective cover 200 to reduce the probability of the positive and negative terminals of the cylindrical battery being connected due to the sealing nail, resulting in a short circuit, thereby improving safety and reliability.

[0089] The pre-welding device 40 is located downstream of the upper nail device 10. The pre-welding device 40 is used to pre-weld the sealing nail to initially fix the sealing nail at the location of the injection hole.

[0090] The lower cover device 50 is located downstream of the pre-welding device 40. The lower cover device 50 can remove the protective cover 200 on the pre-welded cylindrical battery for use in the next batch of cylindrical battery covers transferred to the pre-welding device 100.

[0091] The detection device 80 is located downstream of the lower cover device 50. The detection device 80 is used to detect the pre-welded cylindrical battery, mainly to check whether there are missing pre-weld points or misaligned welding problems.

[0092] The unloading device 70 is located downstream of the detection device 80 and can be used to remove pre-welded cylindrical batteries from the pre-welding equipment 100. Of course, the pre-welding equipment 100 can also have a defective material bin. Cylindrical batteries that have not been pre-welded can be transferred again for pre-welding. Cylindrical batteries that have been pre-welded but have missing solder joints or off-center soldering problems can be transferred to the defective material bin through the unloading device 70.

[0093] like Figure 13 As shown, the cylindrical battery is fed from the feeding device 60 to the carrier 32. The carrier 32 is connected to the mover 31 and is transported to the position of the top cover device 20 via the mover 31. The top cover device 20 installs the protective cover 200 onto the cylindrical battery. The mover 31 further transports the cylindrical battery with the protective cover 200 installed to the position of the nailing device 10. The nailing device 10 places the sealing nail at the position of the liquid injection hole. The mover 31 further transports the cylindrical battery with the nail installed to the position of the pre-welding device 40. After the pre-welding device 40 pre-welds the sealing nails, the mover 31 further transports the pre-welded cylindrical battery to the lower cover device 50. After the lower cover device 50 removes the protective cover 200, the mover 31 further transports the pre-welded cylindrical battery to the location of the detection device 80. After the detection device 80 completes the detection of the cylindrical battery, the mover 31 further transports the pre-welded cylindrical battery to the location of the unloading device 70. The unloading device 70 removes the pre-welded cylindrical battery from the pre-welding equipment 100.

[0094] The following is for reference. Figures 1-14 This application describes a pre-welding device 100 and a control method according to embodiments thereof.

[0095] Combination Figure 1 , Figure 3 as well as Figure 4 As shown, this application proposes a pre-welding device 100, including: a top nail device 10 and a top cover device 20. The top nail device 10 is used to place a sealing nail to one end of the cylindrical battery with a liquid injection hole. The top cover device 20 is located upstream of the top nail device 10 and is used to cover the end of the cylindrical battery with a protective cover 200.

[0096] Specifically, the top cover device 20 can install the protective cover 200 onto the end of the cylindrical battery with the liquid injection hole. The protective cover 200 is constructed of an insulating material and covers the cylindrical battery. The protective cover 200 has a clearance hole opposite to the liquid injection hole. The top nail device 10 can place the sealing nail in the area of ​​the clearance hole so that the sealing nail can be placed at the position of the liquid injection hole. Since the protective cover 200 is constructed of an insulating material, after the sealing nail is placed in the expected position, the probability of the sealing nail directly contacting the negative electrode of the casing or the cylindrical battery on the end cover is lower, thereby reducing the probability of short circuit in the cylindrical battery and reducing safety hazards.

[0097] It should be noted that the protective cover 200 is made of insulating material and should have good corrosion resistance. In addition to achieving insulation protection, it also needs to be replaced regularly to reduce the probability of adhesion and contamination of the cylindrical battery on the protective cover 200, thereby reducing the probability that the protective cover 200 will affect the product yield.

[0098] Understandably, before attaching the nail, this application first installs the protective cover 200 onto the end of the cylindrical battery with the liquid injection hole. Before the sealing nail is pre-welded, the protective cover 200 provides effective insulation protection for the inside of the cylindrical battery, avoiding damage to the cylindrical battery due to current leakage or short circuit during the pre-welding process, thereby improving the pre-welding safety and quality of the cylindrical battery.

[0099] The protective cover 200 may include a sleeve portion and a cover plate portion located at one end of the sleeve portion. An avoidance hole may be formed on the cover plate portion. Annular magnets may be provided on the side surface of the cover plate portion facing the cylindrical battery and on the inner surface of the sleeve portion facing the cylindrical battery to ensure that the protective cover 200 can be stably fixed on the cylindrical battery for insulation protection. This prevents the protective cover 200 from falling off due to vibration or operational errors during the operation of the pre-welding equipment 100, ensuring that the protective cover 200 is always in the correct position, thereby providing continuous and reliable insulation protection for the cylindrical battery. The adsorption function of the annular magnet simplifies the installation and fixing process of the protective cover 200, allowing for precise positioning and fixing of the protective cover 200 without additional fixing devices or complex operations. This not only improves operational efficiency but also reduces the workload of operators.

[0100] According to the pre-welding equipment 100 of this application embodiment, by setting the top cover device 20 and placing the top cover device 20 upstream of the nailing device 10, the installation of the protective cover 200 can be completed before nailing, so as to ensure that the cylindrical battery can be insulated and protected before subsequent processing in the pre-welding equipment 100, thereby reducing the risk of short circuit in the cylindrical battery during subsequent processing and improving the processing safety and reliability of the pre-welding equipment 100.

[0101] like Figure 1As shown, according to some embodiments of this application, the pre-welding equipment 100 further includes: a magnetic drive conveyor belt 30, on which a mover 31 is disposed, the mover 31 being movably disposed on the magnetic drive conveyor belt 30, the mover 31 having a carrier 32, and a cylindrical battery disposed on the carrier 32.

[0102] Specifically, the magnetic drive conveyor belt 30 defines the flow path of the cylindrical battery in the pre-welding equipment 100, which can be circular or linear. The feeding device 60, the top cover device 20, the top nail device 10, the pre-welding device 40, the bottom cover device 50, the detection device 80, and the unloading device 70 are arranged sequentially based on the flow direction of the cylindrical battery.

[0103] In this way, the magnetic drive conveyor belt 30 drives the mover 31 to move the carrier 32 synchronously, which can not only increase the turnover speed of the cylindrical batteries, but also speed up the production cycle and improve production efficiency. It can also improve the transportation accuracy, so that the cylindrical batteries can move to the position of each device with higher accuracy. Higher accuracy can also improve production efficiency, processing accuracy and processing quality.

[0104] Of course, using the magnetic drive conveyor belt 30 for transporting cylindrical batteries can also reduce the difficulty of layout based on the high flexibility of the magnetic drive conveyor belt 30, adapt to various space requirements, realize the overall compact setting of the pre-welding equipment 100, reduce space occupation, and make maintenance simpler and more convenient. The downtime after failure is shorter, which can further improve production efficiency and reduce maintenance and upkeep costs.

[0105] like Figure 2 As shown, according to some embodiments of this application, the carrier 32 includes: a partition 321, a connecting plate 322 located on both sides of the partition 321, and a clamp 323. The clamp 323 includes a support plate 3231 and a positioning part located above the support plate 3231. The support plate 3231 and the positioning part are both connected to the partition 321. The clamp 323 is used to fix the cylindrical battery. The connecting plate 322 is connected to the mover 31.

[0106] Specifically, the partition 321 is connected to the plate 322 and the clamp 323 on both sides respectively. The clamp 323 is used to position the cylindrical battery. The cylindrical battery can be placed in the cup. The clamp 323 can be used to position the cylindrical battery and the cup at the same time. The connecting plate 322 can be detachably set on the mover 31 by one or more fasteners (hex socket head cap screws).

[0107] In this way, on the one hand, the disassembly and assembly between the carrier 32 and the mover 31 can be made easier. On the other hand, the clamp 323 and the connecting plate 322 are located on both sides of the partition 321, which can reduce the probability of interference with surrounding components during the positioning of the cylindrical battery and improve the load-bearing stability and reliability of the carrier 32 on the cylindrical battery.

[0108] like Figure 2 As shown, according to some embodiments of this application, a positioning pin 3221 is provided on the connecting plate 322, and the protective cover 200 is detachably disposed on the positioning pin 3221.

[0109] Specifically, the positioning pin 3221 may include a first frustum and a second frustum. The outer diameter of the first frustum is consistent with the inner diameter of the sleeve portion of the protective cover 200, and the outer diameter of the second frustum is consistent with the inner diameter of the clearance hole on the cover plate portion of the protective cover 200, so that the protective cover 200 can be placed on the positioning pin 3221, with the sleeve portion cooperating with the first frustum for limiting the position, and the cover plate portion cooperating with the second frustum for limiting the position.

[0110] Understandably, the upper cover device 20 is adapted to switch between a first position and a second position. In the first position, the upper cover device 20 is adapted to remove the protective cover 200 by the positioning pin 3221. In the second position, the upper cover device 20 is adapted to install the protective cover 200 onto the cylindrical battery located in the clamp 323. The lower cover device 50 is adapted to switch between a third position and a fourth position. In the third position, the lower cover device 50 is adapted to remove the protective cover 200 from the cylindrical battery. In the fourth position, the lower cover device 50 is adapted to place the protective cover 200 onto the positioning pin 3221. The upper cover device 20 and the lower cover device 50 can be switched between two positions in the linear direction at least partially (upper cover clamp 22 and lower cover clamp 52) to achieve the removal and placement of the protective cover 200, which can improve the convenience of removing and placing the protective cover 200 and make the removal and placement accuracy of the protective cover 200 higher.

[0111] In this way, the positioning pin 3221 is used to position and fix the protective cover 200, which reduces the probability of the protective cover 200 falling off. Before the protective cover 200 is installed on the upper cover device 20 (to install the protective cover 200 onto the cylindrical battery), the protective cover 200 can be fixed by the positioning pin 3221. After the protective cover 200 is removed from the cylindrical battery by the lower cover device 50, the protective cover 200 can be placed on the positioning pin 3221. On the one hand, the setting of the positioning pin 3221 can reduce the risk and probability of the protective cover 200 falling off. On the other hand, it can realize the recycling of the protective cover 200 and improve the convenience of taking out the protective cover 200.

[0112] like Figure 2 As shown, according to some embodiments of this application, the positioning part includes a first positioning part 3232 and a second positioning part 3233. The cylindrical battery is disposed on the cup, the first positioning part 3232 is positioned in cooperation with the cup, and the second positioning part 3233 is positioned in cooperation with the outer peripheral surface of the cylindrical battery.

[0113] It should be noted that the existing fixtures have complex structures and low positioning accuracy, which can easily lead to misalignment between the battery cover and the sealing nail, thus affecting the welding quality.

[0114] This application provides a first positioning part 3232 and a second positioning part 3233 on the clamp 323, and positions the first positioning part 3232 in conjunction with the cup and the second positioning part 3233 in conjunction with the outer peripheral surface of the cylindrical battery. This can improve the positioning accuracy. Both the first positioning part 3232 and the second positioning part 3233 can be constructed as magnetic positioning. Under the premise of improving the positioning accuracy, the cup and the cylindrical battery are easier to assemble and disassemble on the clamp 323, and the stability of the cylindrical battery can also meet the requirements.

[0115] In other words, the cup and the first positioning part 3232 achieve coarse positioning, and the cylindrical battery and the second positioning part 3233 achieve fine positioning. This can improve the positioning accuracy of the cylindrical battery and the alignment effect between the cylindrical battery and the sealing nail, thereby improving the subsequent welding quality.

[0116] In summary, the pre-welding equipment 100 according to the embodiments of this application can not only improve the positioning accuracy of the sealing nail and improve the welding effect, but also improve production efficiency by using a magnetic drive conveyor belt 30 to transport cylindrical batteries.

[0117] like Figure 4 and Figure 5 As shown, according to some embodiments of this application, the cover device 20 includes: a first drive group 21 and a cover clamp 22. The first drive group 21 is used to drive the cover clamp 22 to switch between a first position and a second position. The cover clamp 22 is adapted to pick up the protective cover 200.

[0118] Specifically, the first drive group 21 can drive the upper cover clamp 22 to move in the relative direction of the connecting plate 322 and the clamp 323, and realize the position switching of the upper cover clamp 22 between the first position and the second position in a linear drive form. After the upper cover clamp 22 moves to the first position or the second position, the first drive group 21 can further drive the upper cover clamp 22 to rise or fall. In the first position, the upper cover clamp 22 falls to pick up the protective cover 200 on the positioning pin 3221. In the second position, the upper cover clamp 22 falls to install the protective cover 200 to the end of the cylindrical battery with the liquid injection hole.

[0119] In other words, the first drive group 21 may include two drive units. The first drive unit is used to drive the upper cover clamp 22 to move between the first position and the second position. The first drive unit is used to drive the upper cover clamp 22 to lift and lower to pick up and put down the protective cover 200. The upper cover clamp 22 itself may be constructed as a claw, a suction nozzle or other structure to pick up the protective cover 200 in a gripping or suction manner.

[0120] Specifically, there can be multiple cover clamps 22, and the number of cover clamps 22 is consistent with the number of carriers 32 in each carrier group, so as to realize the synchronous installation of the protective covers 200 of multiple cylindrical batteries and improve the assembly efficiency. The multiple cover clamps 22 can be set on a first plate 24. The first drive unit is connected to the second drive unit, and the second drive unit is connected to the first plate 24, so that the first drive unit drives the second drive unit, the first plate 24 and the cover clamps 22 to move synchronously to switch between the first position and the second position. After the cover clamps 22 reach the first position or the second position, the second drive unit drives the cover clamps 22 and the first plate 24 to rise and fall to pick up and put down the protective cover 200.

[0121] Therefore, by driving the top cover clamp 22 through the first drive group 21 to realize the removal of the protective cover 200 on the positioning pin 3221 and the installation on the cylindrical battery, the structure of the top cover device 20 can be simplified, and the removal, placement and installation accuracy of the protective cover 200 of the top cover device 20 can be improved.

[0122] See Figure 5 As shown, according to some embodiments of this application, a first elastic buffer structure 23 is provided between the first drive group 21 and the upper cover clamp 22 so that the upper cover clamp 22 is elastically connected to the first drive group 21.

[0123] Specifically, the top cover clamp 22 is slidably mounted on the first plate 24 (e.g., via a slider rail structure), and the first plate 24 is provided with a first elastic buffer structure 23 (e.g., a spring). One end of the spring elastically pushes against the baffle on the first plate 24, and the other end of the spring pushes against the top cover clamp 22. This prevents the top cover clamp 22 from being over-pressed during the process of the top cover clamp 22 descending to the positioning pin 3221 to pick up the protective cover 200, or descending to the end of the cylindrical battery with the liquid injection hole to place the protective cover 200. This not only extends the service life of the carrier 32 and the top cover device 20, but also prevents damage to the cylindrical battery, thereby improving the processing reliability and stability of the pre-welding equipment 100.

[0124] like Figure 1 As shown, according to some embodiments of this application, the pre-welding equipment 100 further includes a pre-welding device 40 and a lower cover device 50. The pre-welding device 40 and the lower cover device 50 are arranged sequentially downstream of the upper nail device 10. The pre-welding device 40 is used to pre-weld the sealing nails, and the lower cover device 50 is used to remove the protective cover 200 on the cylindrical battery.

[0125] Specifically, the upper cover device 20, the upper nail device 10, the pre-welding device 40, and the lower cover device 50 are sequentially arranged on the flow path of the cylindrical battery within the pre-welding equipment 100, so that the protective cover 200 is applied before nailing and the protective cover 200 is applied after pre-welding. This ensures that even if the sealing nail is mispositioned, poorly welded, or even moves during the nailing and pre-welding processes, it will not cause a short circuit in the cylindrical battery, thereby further improving the safety of the pre-welding equipment and reducing safety hazards.

[0126] like Figure 6 and Figure 7 As shown, according to some embodiments of this application, the lower cover device 50 includes: a second drive group 51 and a lower cover clamp 52. The second drive group 51 is used to drive the lower cover clamp 52 to switch between a third position and a fourth position. The lower cover clamp 52 is adapted to pick up the protective cover 200.

[0127] Specifically, the second drive group 51 can drive the lower cover clamp 52 to move in the relative direction of the connecting plate 322 and the clamp 323, and realize the position switching of the lower cover clamp 52 between the third position and the fourth position in a linear drive form. After the lower cover clamp 52 moves to the third position or the fourth position, the second drive group 51 can further drive the lower cover clamp 52 to rise or fall. In the fourth position, the lower cover clamp 52 falls to place the protective cover 200 on the positioning pin 3221. In the third position, the lower cover clamp 52 falls to remove the protective cover 200 from the end of the cylindrical battery with the liquid injection hole.

[0128] In other words, the second drive group 51 may include two drive units. The third drive unit is used to drive the lower cover clamp 52 to move between the third position and the fourth position, and the fourth drive unit is used to drive the lower cover clamp 52 to lift and lower to pick up and put down the protective cover 200. The lower cover clamp 52 itself may be constructed as a claw, a suction nozzle or other structure to pick up the protective cover 200 in a gripping or suction manner.

[0129] Specifically, there can be multiple lower cover clamps 52, and the number of lower cover clamps 52 is consistent with the number of carriers 32 in each carrier group, so as to realize the synchronous disassembly of the protective covers 200 of multiple cylindrical batteries and improve the disassembly efficiency. The multiple lower cover clamps 52 can be set on a second plate 55. The third drive unit is connected to the fourth drive unit, and the fourth drive unit is connected to the second plate 55, so that the third drive unit drives the fourth drive unit, the second plate 55 and the lower cover clamps 52 to move synchronously to switch between the third position and the fourth position. After the lower cover clamps 52 reach the third position or the fourth position, the fourth drive unit drives the lower cover clamps 52 and the second plate 55 to rise and fall to pick up and put down the protective cover 200.

[0130] Therefore, by driving the lower cover clamp 52 through the second drive group 51 to place the protective cover 200 on the positioning pin 3221 and remove it from the cylindrical battery, the structure of the lower cover device 50 can be simplified, and the placement and installation accuracy of the protective cover 200 of the lower cover device 50 can be improved.

[0131] See Figure 6 As shown, according to some embodiments of this application, the lower cover clamp 52 is further provided with a rejection part 54, which is used to adsorb the sealing nails located on the cylindrical battery when the lower cover clamp 52 is in the third position.

[0132] The material removal part 54 can be configured as a suction nozzle (negative pressure suction nozzle or vacuum suction nozzle). The material removal part 54 is located on the lower cover clamp 52. If the lower cover clamp 52 has claws, the material removal part 54 is located at the center of the claws. The material removal part 54 is suitable for adsorbing the sealing nails located on the cylindrical battery. The cylindrical battery transferred from the pre-welding device 40 to the unloading device 70 will adsorb the sealing nails once during the process of lowering the protective cover 200. The sealing nails pre-welded to the end cap of the cylindrical battery will not fall off during the adsorption process, while the missing sealing nails can be removed. The seal nail is removed under the action of the rejection section 54 (the adsorption force of the rejection section 54 is greater than the weight of the seal nail). That is, while the lower protective cover 200 is being installed, the defective seal nail can be rejected. This not only reduces material waste, but also prevents the defective seal nail from flowing to the corresponding cylindrical battery in the subsequent process and causing a short circuit in the subsequent process. This eliminates the safety hazards caused by the defective seal nail, further improves the safety of the pre-welding equipment 100, makes the subsequent processes safer, and improves the final cylindrical battery product quality.

[0133] like Figure 6 As shown, according to some embodiments of this application, a second elastic buffer structure 53 is provided between the second drive group 51 and the lower cover clamp 52 so that the lower cover clamp 52 is elastically connected to the second drive group 51.

[0134] Specifically, the lower cover clamp 52 is slidably mounted on the second plate 55 (e.g., via a slider rail structure), and the second plate 55 is provided with a second elastic buffer structure 53 (e.g., a spring). One end of the spring elastically pushes against the baffle on the second plate 55, and the other end of the spring pushes against the lower cover clamp 52. This prevents overpressure on the lower cover clamp 52 during the process of the lower cover clamp 52 descending to the positioning pin 3221 to place the protective cover 200, or descending to the end of the cylindrical battery with the liquid injection hole to remove the protective cover 200, thus avoiding damage to the protective cover 200, the positioning pin 3221, the cylindrical battery, or the upper cover clamp 22. This not only extends the service life of the carrier 32 and the lower cover device 50, but also prevents damage to the cylindrical battery, thereby improving the processing reliability and stability of the pre-welding equipment 100.

[0135] like Figure 1 As shown, according to some embodiments of this application, the pre-welding equipment 100 further includes: a feeding device 60, a discharging device 70, and a detection device 80. The feeding device 60 is located upstream of the upper cover device 20 and is used to supply cylindrical batteries to the mover 31 of the magnetic drive conveyor belt 30. The discharging device 70 and the detection device 80 are arranged sequentially downstream of the lower cover device 50. The detection device 80 is used to detect the pre-welding quality of the sealing nails on the cylindrical battery, and the discharging device 70 is used to remove the cylindrical battery.

[0136] Specifically, the workflow of the pre-welding equipment 100 is as follows: the feeding device 60 feeds cylindrical batteries onto the carrier 32, the carrier 32 moves to the position of the cover device 20, and the protective cover 200 is applied before nailing. The nailing device 10 has a nailing visual guidance device. After the carrier 32 moves to the position of the nailing device 10, the nailing visual guidance device identifies whether the cylindrical batteries located at the position of the nailing device 10 have a protective cover 200, and performs nailing on the cylindrical batteries with protective covers 200 accordingly. The carrier 32 then moves further to the position of the pre-welding device 40. After the pre-welding device 40 completes the pre-welding, the carrier 32 moves further... When the lower cover device 50 is in position, the lower cover device 50 can simultaneously remove the unpre-welded sealing nails from the corresponding cylindrical batteries while the lower protective cover 200 is being installed. The protective cover 200 is then placed on the positioning pin 3221. The cylindrical batteries without pre-welded sealing nails can continue to circulate in the pre-welding equipment 100 until pre-welding is completed. The pre-welded cylindrical batteries can be moved to the position of the detection device 80 under the further drive of the carrier 32. The detection device 80 detects the pre-welding point offset and missing welds. Cylindrical batteries with pre-welding point offset or missing welds are not transferred to the subsequent process equipment. Pre-welded good batteries are transferred to the subsequent process equipment.

[0137] This ensures that the cylindrical battery will not short-circuit during the nailing process, and the battery will only flow out of the pre-welding equipment 100 after pre-welding is completed. This ensures the insulation protection of the cylindrical battery. That is, before the sealing nail is welded, the upper protective cover 200 provides effective insulation protection for the inside of the battery, avoiding damage to the cylindrical battery due to current leakage or short circuit during the welding process, and ensuring the safety and welding quality of the cylindrical battery.

[0138] Visual guidance before nailing ensures that pre-welding is only performed if the protective cover 200 is correctly installed. This reduces welding failures and safety hazards caused by missing protective covers 200, improving the controllability and safety of the production process. Pre-welding point offset detection or alarms before material handling allow for timely identification and resolution of potential welding problems, preventing defective products from entering subsequent processes and further ensuring the consistency and reliability of cylindrical batteries.

[0139] like Figure 13 As shown, this application proposes a control method for a pre-welding device 100, the control method including: installing a protective cover 200 onto a cylindrical battery before nailing.

[0140] According to the control method of the pre-welding equipment 100 in the embodiments of this application, the protective cover 200 can be installed on the cylindrical battery before the nail is attached. This can ensure that the cylindrical battery has a lower probability of current leakage and short circuit during subsequent processing in the pre-welding equipment 100, thereby improving the safety and reliability of the pre-welding equipment 100 in the processing of the cylindrical battery.

[0141] Further reference Figure 13 As shown, according to some embodiments of this application, the control method further includes: removing the protective cover 200 from the cylindrical battery after pre-soldering.

[0142] In other words, the control method of this application embodiment, based on the processing of the pre-welding equipment 100, removes the protective cover 200 only after the pre-welding is completed. This ensures that the sealing pin is in the position of the liquid injection hole of the cylindrical battery and is pre-fixed so that the sealing pin will not move before removing the protective cover 200. This ensures that insulation protection is achieved through the protective cover 200 during the processing when the sealing pin may be displaced. In the processing when no further protection is needed, the protective cover 200 can be removed in time. Under the premise of ensuring insulation protection for the cylindrical battery, the protective cover 200 can be reused repeatedly.

[0143] like Figure 13 As shown, according to some embodiments of this application, the control method further includes: before the protective cover 200 is installed on the cylindrical battery, the cylindrical battery is fed to the mover 31; after the protective cover 200 is removed from the cylindrical battery, the cylindrical battery is unloaded and removed from the pre-welding equipment 100.

[0144] Step 1: The feeding device 60 installs the cylindrical battery onto the carrier 32;

[0145] Step 2: The cylindrical battery moves to the top cover device 20. The top cover clamp 22 takes the protective cover 200 by the positioning pin 3221 at the first position and moves to the second position to install the protective cover 200 onto one end of the liquid filling hole of the cylindrical battery.

[0146] Step 3: The cylindrical battery moves to the nailing device 10, and the nailing device 10 performs a nailing action on the cylindrical battery with the protective cover 200.

[0147] Step 4: The cylindrical battery moves to the pre-welding device 40, where the pre-welding device 40 performs pre-welding of the sealing nails;

[0148] Step 5: The cylindrical battery moves to the lower cover device 50. The lower cover clamp 52 is in the third position where the cylindrical battery removes the protective cover 200. The material removal part 54 inside the lower cover clamp 52 simultaneously adsorbs the sealing nails to adsorb and remove the unwelded sealing nails. Then, it moves to the fourth position and places the protective cover 200 onto the positioning pin 3221. If there are unwelded sealing nails, the unwelded sealing nails are placed into the nail dropping slot.

[0149] Step 6: Move the cylindrical battery to the detection device 80 to check for the presence of sealing nails and whether there are any missing or misaligned pre-welded points;

[0150] Step 7: The cylindrical battery is moved to the unloading device 70, and the cylindrical battery that is found to be good is removed from the pre-welding equipment 100 by the unloading device 70.

[0151] In step 3, the cylindrical battery is precisely delivered by the actuator 31 to the location of the mounting device 10. During this process, the position and status of the cylindrical battery are monitored in real time to ensure it is in the correct pre-welding position. Once the cylindrical battery reaches the designated position, the pre-mounting visual guidance device is immediately activated. Using a high-precision camera and image processing algorithm, it quickly identifies and locates the position of the battery's liquid injection hole, which improves the accuracy of the sealing nail placement and thus ensures the welding quality.

[0152] It should be noted that the core function of the pre-nailing visual guidance device is not limited to locating the injection hole, but can also include detecting the protective cover 200. Before nailing, the pre-nailing visual guidance device automatically checks whether the protective cover 200 is correctly installed. If the pre-nailing visual guidance device detects that the protective cover 200 is missing or not correctly installed, it will immediately issue an alarm and stop the nailing process to prevent the sealing nail from being mistakenly placed on a cylindrical battery without the protective cover 200, thereby avoiding potential safety risks and damage to the cylindrical battery.

[0153] In step 5, the cylindrical battery is transported to the location of the lower cover device 50 via the mover 31. The position and status of the cylindrical battery are also monitored in real time to ensure that it is in the correct operating position. Once the cylindrical battery reaches the designated position, the lower cover clamp 52 immediately starts, ready to perform the lower cover action.

[0154] The lower cover assembly 50 is equipped with high-precision sensors and grippers (i.e., lower cover clamps) capable of accurately positioning and gripping the protective cover 200. As the grippers approach the cylindrical battery, sensors at their front end automatically detect the position and status of the protective cover 200, ensuring accurate gripping. The grippers remove the protective cover 200 from the cylindrical battery and place it on the positioning pin 3221 of the carrier 32. The design of the positioning pin 3221 ensures the stable placement of the protective cover 200, preventing displacement or falling during subsequent processing.

[0155] Simultaneously, the material rejection section 54 inside the gripper operates concurrently, responsible for handling the recycling of the sealing nails. As the gripper removes the protective cover 200, the suction nozzle uses negative pressure to pick up the un-pre-welded sealing nails from the cylindrical battery and place them into the adjacent nail dropping slot. The design of the nail dropping slot ensures the orderly storage of the sealing nails, avoiding production disruptions or safety hazards caused by scattering.

[0156] The pre-welding device 40 and the control method of the pre-welding device 40 of the pre-welding equipment 100 according to the embodiments of this application will be described in detail below.

[0157] Understandably, the sealing pin is a crucial sealing component of cylindrical batteries, and its welding quality directly affects the battery's sealing performance, lifespan, and safety. In the manufacturing process of cylindrical batteries, the pre-welding process of the sealing pin is one of the key steps, requiring high-precision, high-quality welding between the battery end cap and the sealing pin.

[0158] However, during the pre-welding process, the nailing device 10 needs to be nailed first and the sealing nail placed in the area of ​​the sealing hole needs to be positioned. However, during the positioning process, if the positioning device structure is unreasonable, it is easy to cause the sealing nail to shift or even lift up, which will lead to poor welding and affect the welding quality.

[0159] Based on this, this application proposes a pre-welding device 40, which achieves the positioning of the sealing nail through the cooperation of the positioning cover plate 412 and the lifting member 413, thereby reducing the probability of the sealing nail being misaligned or warped, and thus improving the welding quality of the pre-welding device 40.

[0160] First, based on Figures 8-12 as well as Figure 14 The working process of the pre-welding device 40 in the embodiments of this application will be described in detail.

[0161] The pre-welding device 40 includes: a base, a positioning component 41, and a pre-welding component 42.

[0162] The base can be constructed as a marble base, on which a pre-welding component 42 and a positioning component 41 are mounted. The pre-welding component 42 includes a galvanometer motion three-axis 421 (driving the pre-welding galvanometer 422 to move along the X-axis, Y-axis, and Z-axis) and the pre-welding galvanometer 422. The positioning component 41 includes a mounting frame 411, a positioning cover plate 412 mounted on the mounting frame 411, and a lifting member 413. The mounting frame 411 is mounted on the base. The galvanometer motion three-axis 421 can drive the pre-welding galvanometer 422 to move. The pre-welding galvanometer 422 performs pre-welding on one side of the positioning cover plate 412, while the lifting member 413 is on the other side of the positioning cover plate 412. The positioning of the cylindrical battery and the sealing nail is achieved by the cooperation of the lifting member 413 and the positioning cover plate 412.

[0163] The pre-welding device 40 may also have pre-welding dust removal components, etc., which are basically consistent with the structure of the prior art, and will not be described in detail in this application.

[0164] Cylindrical batteries can be transported by a carrier group, which can simultaneously transport at least one cylindrical battery to the location of the pre-welding device 40. After arriving at the location of the pre-welding device 40, the positioning cover plate 412 is pressed down first, and the pressing pin 414 contacts the sealing pin to achieve pre-positioning of the sealing pin. The lifting member 413 drives the cylindrical battery to be lifted so that the end of the cylindrical battery with the liquid injection hole can be pushed against the positioning cover plate 412. When there are multiple cylindrical batteries, the liquid injection holes of multiple cylindrical batteries can be located in the same plane, and the pressing pin 414 is simultaneously pressed against the sealing pin to avoid the sealing pin from shifting or lifting. The pre-welding galvanometer 422 then pre-welds the cylindrical battery and the sealing pin based on the offset identified by the pre-welding visual guidance camera 423. During the pre-welding process, the pre-welding dust removal component starts negative pressure dust removal simultaneously.

[0165] like Figure 8 , Figure 9 and Figure 10 As shown, this application discloses a pre-welding device 40, including: a positioning assembly 41, the positioning assembly 41 including: a mounting frame 411, a positioning cover plate 412 and a lifting member 413 located on one side of the positioning cover plate 412 and movable toward or away from the positioning cover plate 412, the positioning cover plate 412 is movably disposed on the mounting frame 411, and a positioning space is defined between the lifting member 413 and the positioning cover plate 412, the positioning space being suitable for accommodating a cylindrical battery and a sealing nail.

[0166] Specifically, the cylindrical battery that has been nailed can move synchronously to the positioning space with the sealing nail. The positioning cover plate 412 is provided with a nail pressing member 414. The nail pressing member 414 is adapted to contact the sealing nail under the action of the positioning cover plate 412, and is adapted to elastically push against the sealing nail under the action of the lifting member 413.

[0167] In other words, both the positioning cover plate 412 and the lifting member 413 can be movably mounted on the mounting bracket 411. When the cylindrical battery and the sealing pin move to the positioning space, the positioning cover plate 412 can move from one axial end of the cylindrical battery toward the cylindrical battery so that the sealing pin contacts the pressing pin member 414 on the positioning cover plate 412. Then, through the lifting member 413 located at the other axial end of the cylindrical battery, the cylindrical battery is driven to move toward the positioning cover plate 412 so that the end cap of the cylindrical battery with the liquid injection hole can be pushed against the positioning cover plate 412 and the pressing pin member 414 can elastically push against the sealing pin.

[0168] Understandably, during the movement of the cylindrical battery and the sealing pin to the positioning space, the pressing pin 414 and the lifting pin 413 on the positioning cover 412 are spaced apart from the cylindrical battery at both ends of the axial direction. At this time, the movement of the cylindrical battery and the sealing pin will not cause friction with the pressing pin 414 and the lifting pin 413, thus preventing the sealing pin from shifting. During the positioning process of the positioning assembly 41 on the sealing pin, the pressing pin 414, driven by the positioning cover 412, moves towards the sealing pin and contacts it, achieving initial positioning of the sealing pin. Meanwhile, the lifting pin 413, while pushing the cylindrical battery, can indirectly... The elastic pushing of the pressure pin 414 against the seal has two main effects. First, the cylindrical battery can move to the side surface of the end cap and positioning cover 412 facing the cylindrical battery, so that when multiple cylindrical batteries are welded at the same time, multiple cylindrical batteries can be welded to the same focal plane, which can improve the pre-welding quality and facilitate dust removal during the pre-welding process. Second, the sealing pin after preliminary positioning can be lifted synchronously during the lifting of the cylindrical battery and achieve elastic pushing against the pressure pin 414. The positioning process of contacting first and then pushing, with the top end pre-positioned and the bottom end rising, has a better positioning effect, which can avoid the pin lifting and improve the pre-welding effect and quality.

[0169] According to the pre-welding device 40 of this application embodiment, by enabling the positioning cover plate 412 and the lifting member 413 to move relative to the mounting frame 411, after the cylindrical battery and the sealing nail move to the positioning space, the pressing member 414 pre-positions the cylindrical battery, and the lifting member 413 realizes the lifting of the cylindrical battery and the elastic pushing positioning of the sealing nail. This not only makes the pre-welding focus of multiple cylindrical batteries more consistent, but also reduces the probability of the sealing nail shifting or lifting, and reduces the probability of pre-welding point missing or shifting, thereby improving the pre-welding quality.

[0170] Combination Figure 10 , Figure 11 as well as Figure 12 As shown, according to some embodiments of this application, the positioning cover plate 412 is provided with a receiving groove 4122 on the side facing the lifting member 413, and the pressing member 414 includes: a connecting block 4141 and a pressing rod 4142. The connecting block 4141 is connected to the positioning cover plate 412, and the pressing rod 4142 is disposed in the receiving groove 4122. The connecting block 4141 has a clearance hole 41411, and the surface of the connecting block 4141 facing the lifting member 413 is flush with the surface of the positioning cover plate 412 facing the lifting member 413. At least a portion of the pressing part 41423 of the pressing rod 4142 extends out of the clearance hole 41411 to push against the sealing nail.

[0171] Specifically, the pressing pin 414 may include a pressing rod 4142 and a connecting block 4141. The connecting block 4141 is used to connect with the positioning cover plate 412 and allow at least a portion of the pressing rod 4142 to be located between the positioning cover plate 412 and the connecting block 4141 to fix the pressing rod 4142. The pressing pin portion 41423 of the pressing rod 4142 may be located in the clearance hole 41411 and at least a portion of it may extend out of the clearance hole 41411 to push against the sealing pin.

[0172] In this way, the connecting block 4141 is flush with the side surface of the positioning cover plate 412 facing the lifting member 413, so that the cylindrical battery can be pushed against the side surface of the positioning cover plate 412 facing the lifting member 413 to facilitate the positioning of the pre-welding focus. The pressing part 41423 extends out of the avoidance hole 41411, so that the pressing part 414 can contact the sealing nail before the lifting member 413 lifts the cylindrical battery, so that the pressing part 41423 can stably and reliably achieve the pre-positioning of the sealing nail.

[0173] Combination Figure 10 and Figure 11 As shown, according to some embodiments of this application, the pressure bar 4142 includes: a connecting arm 41421, an extension arm 41422, and a pressure pin portion 41423. The connecting arm 41421 is connected to the positioning cover plate 412. One end of the extension arm 41422 is connected to the connecting arm 41421, and the other end of the extension arm 41422 is connected to the pressure pin portion 41423, so that at least a portion of the pressure pin portion 41423 extends out of the clearance hole 41411.

[0174] Specifically, there can be multiple extension arms 41422, and multiple connecting arms 41421 are arranged circumferentially around the pressing part 41423. There can be two, three or four arms arranged at equal angle intervals. The connecting arms 41421 are connected to the connecting block 4141 or the positioning cover plate 412. The extension arm 41422 is constructed as an inclined arm, with one end connected to the connecting arm 41421 and the other end connected to the pressing part 41423, so that the pressing part 41423 can be located at the center of the clearance hole 41411 and can at least partially extend out of the clearance hole 41411.

[0175] In this way, the fastener 414 is fixed on the positioning cover plate 412 by the connecting arm 41421. The connecting arm 41421 is constructed in multiple ways, and the multi-sided fixing structure can ensure that the fastener 4142 will not deform during long-term use, thereby improving the positioning accuracy and positioning reliability of the fastener 414.

[0176] Combination Figure 11 and Figure 12As shown, according to some embodiments of this application, the positioning cover plate 412 is provided with a welding through hole 4121, the clearance hole 41411 is opposite to the welding through hole 4121, and the pressing part 41423 is located at the center of the welding through hole 4121.

[0177] Specifically, the pre-welding galvanometer 422 of the pre-welding assembly 42 can pre-weld the sealing nail by using a welding laser passing through the welding through hole 4121 and the clearance hole 41411. By placing the pressure nail part 41423 at the center of the welding through hole 4121, the sealing nail after positioning can be placed at the center of the welding through hole 4121, which can improve the positioning accuracy and reduce the adjustment amount of the pre-welding galvanometer 422, thereby improving the pre-welding efficiency and pre-welding accuracy.

[0178] like Figure 12 As shown, according to some embodiments of this application, the nail clamping part 41423 includes: a nail clamping rod 41424, a clamping block 41425, and a first elastic member 41426. The nail clamping rod 41424 is constructed as part of the clamping rod 4142 and has a receiving cavity. The clamping block 41425 is movably disposed in the receiving cavity. The first elastic member 41426 is disposed in the receiving cavity and elastically pushes against the clamping block 41425 so that the clamping block 41425 is adapted to elastically push against the sealing nail.

[0179] Specifically, the pressure block 41425 is movably disposed within the accommodating cavity and is adapted to extend the pressure rod 41424 under the elastic force of the first elastic member 41426 to contact the sealing nail. When the cylindrical battery is lifted, the pressure block 41425 elastically pushes against the sealing nail and can overcome the elastic force of the first elastic member 41426 to move at least partially into the accommodating cavity.

[0180] In this way, the elastic pushing of the sealing nail can be achieved by the floating amount of the pressure block 41425. This not only improves the positioning effect of the sealing nail and avoids the phenomenon of the sealing nail being lifted, but also avoids the probability of the sealing nail being unable to be pressed tightly or the pressure applied to the sealing nail being too large, which would lead to the deformation of the sealing nail.

[0181] like Figure 9 As shown, according to some embodiments of this application, the lifting member 413 includes: a cylindrical body 4131 and a push rod 4132, with a second elastic member provided between the cylindrical body 4131 and the push rod 4132, so that the push rod 4132 is adapted to push the end of the cylindrical battery away from the positioning cover plate 412.

[0182] Specifically, a second elastic element is provided inside the cylinder 4131. The second elastic element elastically pushes against the push rod 4132 so that the push rod 4132 elastically pushes against the cylindrical battery. During the process of lifting the cylindrical battery, the second elastic element can achieve elastic pushing against the cylindrical battery to avoid excessive pushing force that could damage the cylindrical battery, thereby improving the reliability of the pre-welding device 40.

[0183] exist Figure 9 In the embodiments shown, according to some embodiments of this application, the positioning component 41 further includes: a first driving part 401, a first slide rail 402, and a first slider 403. The positioning cover plate 412 and the mounting bracket 411 are provided with a sliding engagement between the first slide rail 402 and the first slider 403. The first driving part 401 is connected to the first slider 403 or the positioning cover plate 412 to drive the positioning cover plate 412. The positioning component 41 further includes: a second driving part 404, a second slide rail 405, and a second slider 406. The mounting bracket 411 and the lifting member are provided with a sliding engagement between the second slide rail 405 and the second slider 406. The second driving part 404 is connected to the second slider 406 or the lifting member to drive the lifting member.

[0184] In other words, the positioning cover plate 412 is movably mounted on the mounting frame 411 via the first slide rail 402 and the first slider 403, and the first drive unit 401 is used to drive the positioning cover plate 412 to move. The lifting member is movably mounted on the mounting frame 411 via the second slide rail 405 and the second slider 406, and the second drive unit 404 is used to drive the lifting member to move.

[0185] This improves the movement accuracy of the positioning cover plate 412 and the lifting component, resulting in higher positioning accuracy and better positioning effect for the cylindrical battery and sealing nail within the positioning space.

[0186] According to some embodiments of this application, the pre-welding equipment 100 further includes: a pre-welding assembly 42 (such as...). Figure 8 As shown, the pre-welded assembly 42 is positioned above the positioning cover plate 412 and is used for pre-welding the sealing nail to the injection hole.

[0187] It should be noted that the pre-welding assembly 42 includes at least a pre-welding galvanometer 422, a pre-welding vision guidance camera 423, and a galvanometer motion three-axis 421. The number of pre-welding vision guidance cameras 423 is consistent with the number of cylindrical batteries that can be pre-welded simultaneously or sequentially in one welding operation. For example, if there are six cylindrical batteries, then there are six pre-welding vision guidance cameras 423, so that each cylindrical battery can be guided to the pre-welding position by a corresponding pre-welding vision guidance camera 423. The number of pre-welding galvanometers 422 can also be multiple, such as two. Then the offset of the three pre-welding vision guidance cameras 423 is sent to the same pre-welding galvanometer 422, and the three cylindrical batteries are pre-welded sequentially through the same pre-welding galvanometer 422. All cylindrical batteries can be welded with one photo, saving vision guidance time. While ensuring pre-welding accuracy and pre-welding quality, it can also improve production cycle and increase production efficiency.

[0188] The number of pre-welded visual guidance cameras 423 is N, the number of pre-welded galvanometers 422 is M, and the offset of N / M (rounded down) pre-welded visual guidance cameras 423 is transmitted to the same pre-welded galvanometer 422. The pre-welded galvanometer 422 continuously welds N / M (rounded down) cylindrical batteries based on the offset.

[0189] It should be noted that by using the pre-welding vision guidance camera 423 in conjunction with the pre-welding galvanometer 422, the control accuracy of welding parameters can be improved, and the probability of incomplete welding or over-welding during the welding process can be reduced, thereby improving the pre-welding quality.

[0190] This application provides a pre-welding device 100, including a pre-welding unit 40 and a magnetic drive conveyor belt 30. A mover 31 is provided on the magnetic drive conveyor belt 30. The mover 31 is movably disposed on the magnetic drive conveyor belt 30. A carrier 32 is provided on the mover 31. A cylindrical battery is disposed on the carrier 32. The mover 31 is adapted to drive the carrier 32 to the positioning space of the pre-welding unit 40.

[0191] It should be noted that in recent years, magnetic drive equipment has been widely used in the production of cylindrical batteries due to its high precision, high speed and high level of automation. However, the difficulty in positioning the sealing nail and the easy damage to the mover 31 have resulted in poor compatibility between the magnetic drive conveyor belt 30 and the pre-welding device 40, making it difficult to effectively improve the production efficiency of the pre-welding equipment 100.

[0192] Based on this, the pre-welding device 40 of this application embodiment is provided with a pressing member 414 and a lifting member 413. After the pressing member 414 performs preliminary positioning, the lifting member 413 drives the cylindrical battery to be lifted, so as to decouple the cylindrical battery from the mover 31, thereby avoiding damage to the mover 31, and making the magnetic drive conveyor belt 30 applicable to the pre-welding equipment 100.

[0193] Specifically, the mover 31 is connected to the carrier 32, which can transport the cylindrical battery and the sealing pin to the positioning space. In the positioning space, the lifting member 413 can lift the cylindrical battery and the sealing pin independently, which can decouple the cylindrical battery from the mover 31, so that the force on the cylindrical battery will not be transmitted to the mover 31. During the pressing down of the positioning cover 412, it is only for the sealing pin and the pressing pin member 414 to come into contact, which can prevent the moving part 31 from being damaged due to the pressing down of the positioning cover 412 and the force during the subsequent processing of the cylindrical battery.

[0194] According to the embodiments of this application, the pre-welding equipment 100, by setting a positioning component 41 in the pre-welding device 40, can prevent the positioning cover plate 412 from pressing down and causing damage to the mover 31, thereby achieving decoupling between the mover 31 and the cylindrical battery. Under the premise of improving positioning accuracy and welding effect, the magnetic drive conveyor belt 30 can be applied to the pre-welding equipment 100, providing technical support for the application of the magnetic drive conveyor belt 30 to the pre-welding equipment 100, thereby further improving the production efficiency of the pre-welding equipment 100.

[0195] like Figure 14 As shown, this application provides a control method for a pre-welding device 40, the control method including:

[0196] The control positioning cover plate 412 moves toward the cylindrical battery until the pressure pin 414 contacts the sealing pin;

[0197] The control lifting component 413 moves toward the cylindrical battery and pushes the cylindrical battery against the positioning cover plate 412, while the pressing component 414 pushes against the sealing nail.

[0198] An exemplary embodiment is illustrated by the pre-welding device 40 simultaneously pre-welding six cylindrical batteries.

[0199] Step 1: The vehicle assembly transports six cylindrical batteries and the corresponding six sealing pins to the positioning space;

[0200] Step 2: The positioning cover plate 412 is pressed down, and the pressing rod moves down synchronously until the pressing part 41423 contacts the sealing nail;

[0201] Step 3: Lifting component 413 lifts the cylindrical battery, detaches it from the cup and the mover 31, and lifts it until the cylindrical battery pushes against the lower surface of the positioning cover plate 412, so that the ends of the six cylindrical batteries with liquid injection holes are kept in the same plane.

[0202] Step 4: Six pre-welded visual guidance cameras 423 take pictures simultaneously. The offset of every three cameras is given to the same pre-welded galvanometer 422. Two pre-welded galvanometers 422 pre-weld three cylindrical batteries in succession.

[0203] Step 5: After pre-welding is completed, the positioning cover plate 412 rises, the lifting component 413 returns to its original position, and the mover 31 drives the carrier 32 to move the pre-welded cylindrical battery out of the positioning space.

[0204] Other configurations and operations of the pre-welding equipment 100 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0205] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0206] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pre-welding device, characterized in that, include: A nailing device (10) is used to place a sealing nail to one end of a cylindrical battery having an injection hole; A top cover device (20) is located upstream of the top nail device (10), and the top cover device (20) is used to cover the cylindrical battery with a protective cover at the end having the liquid injection hole; wherein A magnetic drive conveyor belt (30) has a carrier (32) on it, and the cylindrical battery is disposed on the carrier (32). The carrier (32) includes: a partition (321) and connecting plates (322) located on both sides of the partition (321) and a clamp (323). in The protective cover is made of insulating material and is placed over the cylindrical battery. The protective cover has a clearance hole opposite to the liquid injection hole. A positioning pin (3221) is provided on the connecting plate (322), and the protective cover is detachably mounted on the positioning pin (3221).

2. The pre-welding equipment according to claim 1, characterized in that, A mover (31) is provided on the magnetic drive conveyor belt (30), the mover (31) is movably disposed on the magnetic drive conveyor belt (30), and a carrier (32) is provided on the mover (31).

3. The pre-welding equipment according to claim 2, characterized in that, The clamp (323) is used to fix the cylindrical battery, and the connecting plate (322) is connected to the mover (31).

4. The pre-welding equipment according to claim 3, characterized in that, The cover device (20) is adapted to switch between a first position and a second position, wherein in the first position, the cover device (20) is adapted to remove the protective cover by the positioning pin (3221), and in the second position, the cover device (20) is adapted to install the protective cover onto the cylindrical battery located in the clamp (323).

5. The pre-welding equipment according to claim 4, characterized in that, The cover device (20) includes: a first drive group (21) and a cover clamp (22), the first drive group (21) being used to drive the cover clamp (22) to switch between a first position and a second position, the cover clamp (22) being adapted to pick up the protective cover.

6. The pre-welding equipment according to claim 5, characterized in that, A first elastic buffer structure (23) is provided between the first drive group (21) and the upper cover clamp (22) so that the upper cover clamp (22) is elastically connected to the first drive group (21).

7. The pre-welding equipment according to claim 4, characterized in that, The pre-welding equipment further includes a pre-welding device (40) and a lower cover device (50). The pre-welding device (40) and the lower cover device (50) are arranged sequentially downstream of the upper nail device (10). The pre-welding device (40) is used to pre-weld the sealing nail, and the lower cover device (50) is used to remove the protective cover on the cylindrical battery.

8. The pre-welding equipment according to claim 7, characterized in that, The lower cover device (50) is adapted to switch between a third position and a fourth position, wherein in the third position the lower cover device (50) is adapted to remove the protective cover from the cylindrical battery, and in the fourth position the lower cover device (50) is adapted to place the protective cover onto the positioning pin (3221).

9. The pre-welding equipment according to claim 8, characterized in that, The lower cover device (50) includes: a second drive group (51) and a lower cover clamp (52), the second drive group (51) being used to drive the lower cover clamp (52) to switch between the third position and the fourth position, the lower cover clamp (52) being adapted to pick up the protective cover.

10. The pre-welding equipment according to claim 9, characterized in that, The lower cover clamp (52) is also provided with a material removal part (54), which is used to adsorb the sealing nails located on the cylindrical battery when the lower cover clamp (52) is in the third position.

11. The pre-welding equipment according to claim 9, characterized in that, A second elastic buffer structure (53) is provided between the second drive group (51) and the lower cover clamp (52) so that the lower cover clamp (52) is elastically connected to the second drive group (51).

12. The pre-welding equipment according to any one of claims 1-11, characterized in that, The pre-welding equipment further includes a feeding device (60), a discharging device (70), and a detection device (80). The feeding device (60) is located upstream of the upper cover device (20) and is used to supply the cylindrical battery to the mover (31) of the magnetic drive conveyor belt (30). The discharging device (70) and the detection device (80) are arranged sequentially downstream of the lower cover device (50). The detection device (80) is used to detect the pre-welding quality of the sealing nails on the cylindrical battery. The discharging device (70) is used to remove the cylindrical battery.

13. A control method for a pre-welding device, the control method being suitable for controlling the pre-welding device according to any one of claims 1-12, characterized in that, include: Before attaching the nail, remove the protective cover using the positioning pin (3221) and install the protective cover onto the cylindrical battery.

14. The control method for the pre-welding equipment according to claim 13, characterized in that, The control method further includes: After pre-welding, the protective cover is removed from the cylindrical battery and installed onto the locating pin (3221).

15. The control method for the pre-welding equipment according to claim 13, characterized in that, The control method further includes: Before the protective cover is installed on the cylindrical battery, the cylindrical battery is fed to the mover (31). After the protective cover is removed from the cylindrical battery, the cylindrical battery is unloaded and removed from the pre-welding equipment.

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