Welding method, welding device, welding equipment and single battery

Abstract

A welding method includes the steps that a shell (21) covered with an end cover (22) is placed in a jig (103), the jig is provided with a receding structure for exposing a to-be-welded area between the end cover and the shell, and the to-be-welded area comprises a first to-be-welded section (241) and a second to-be-welded section (242) which are located on the two opposite sides of the end cover; and the jig is moved to a first welding station (2201) of welding equipment, a first welding head (101) of the welding equipment is used for welding the first to-be-welded section through the receding structure, a second welding head (102) of the welding equipment is used for welding the second to-be-welded section through the receding structure, and the first welding station is located between the first welding head and the second welding head. The welding method is high in welding efficiency. The invention further relates to a welding device, welding equipment and a battery cell.

Description

Welding method, welding device, welding equipment and battery cell Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a welding method, a welding device, welding equipment and a battery cell. Background Art

[0002] With the rapid development of the battery industry, the production efficiency requirements for batteries are becoming increasingly higher. At the same time, higher requirements are also placed on the welding process in the battery production process. The most important process in the battery welding process is the welding and packaging of the shell and end cover. During welding, the electrode assembly with the end cover is installed in the shell, and then the periphery of the end cover is welded to the periphery of the shell opening to form a whole shell and end cover. However, the welding efficiency of the end cover and the shell is low and cannot meet the higher production efficiency requirements.

[0003] Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a welding method, a welding device, a welding equipment and a battery cell, including but not limited to solving the problem of low welding efficiency of the end cover and the shell.

[0005] The technical solution adopted in the embodiment of this application is:

[0006] In a first aspect, a welding method is provided, comprising the following steps:

[0007] The housing with the end caps is placed in a jig, wherein the jig is configured with an airtight structure for exposing the area to be welded between the end caps and the housing, wherein the area to be welded includes a first section to be welded and a second section to be welded located on opposite sides of the end caps;

[0008] The jig is moved to the first welding station of the welding equipment, the first welding head of the welding equipment welds the first section to be welded through the air avoidance structure, and the second welding head of the welding equipment welds the second section to be welded through the air avoidance structure, wherein the first welding station is located between the first welding head and the second welding head.

[0009] The welding method of the embodiment of the present application, the welding method of the embodiment of the present application, first installs the shell with the end cover in the jig, and then moves the jig and the shell to the first welding station, at the same time, the first welding head and the second welding head are located on the opposite sides of the jig; after that, the first welding head and the second welding head respectively weld the first section to be welded and the second section to be welded through the air avoidance structure, thereby realizing the welding of the opposite sides of the end cover. Compared with the welding method using a circle, this welding method has high welding efficiency.

[0010] In one embodiment, the area to be welded includes multiple sections to be welded, each section to be welded is correspondingly provided with a welding head, and the multiple sections to be welded are connected end to end in sequence to form a ring structure. Two of the multiple sections to be welded are respectively the first section to be welded and the second section to be welded. The welding head corresponding to the first section to be welded is the first welding head, and the welding head corresponding to the second section to be welded is the second welding head.

[0011] In the welding method of the embodiment of the present application, each welding head welds the corresponding section to be welded one by one, so that the full circle welding of the end cover and the shell can be completed, so that the end cover completely seals the internal space of the shell; in addition, the end cover and the shell are welded in sections by multiple welding heads, and the welding efficiency is high.

[0012] In one embodiment, the welding directions of the two welding heads corresponding to a pair of opposite sections to be welded among the multiple sections to be welded are opposite.

[0013] In the welding method of the embodiment of the present application, the welding directions of the two welding heads corresponding to a pair of sections to be welded are opposite, so that the welding starting points and welding end points of the two sections to be welded in the pair of sections to be welded are distributed in opposite directions, which can reduce the risk of ending the welding at the same place and is conducive to improving the welding quality.

[0014] In one embodiment, the welding start point of one of any two adjacent sections to be welded among the plurality of sections to be welded is connected to the welding end point of the other one.

[0015] In the welding method of the embodiment of the present application, the welding starting point of one of any two adjacent sections to be welded among multiple sections to be welded is connected to the welding end point of the other, so that the welding end points of all sections to be welded will not overlap, which is beneficial to improving the welding quality and improving the sealing performance between the end cover and the shell.

[0016] In one embodiment, the welding directions of the two welding heads corresponding to a pair of opposite sections to be welded among the multiple sections to be welded are the same.

[0017] In the welding method of the embodiment of the present application, the welding directions of two welding heads corresponding to a pair of opposite sections to be welded among the multiple sections to be welded are the same, and the welding operation is simple and easy to implement.

[0018] In one embodiment, at least one welding head welds the corresponding section to be welded along a first direction and then welds the corresponding section to be welded in a reverse direction.

[0019] In the welding method of the embodiment of the present application, the welding head welds the corresponding section to be welded along the first direction, and then welds the section to be welded in the reverse direction. In this way, one end of the two ends of the section to be welded is the welding starting point along the first direction, and the other end is the welding starting point for reverse welding. This can reduce the risk of the welding end points of two adjacent sections to be welded being located at the same place, thereby improving the welding quality. In addition, if the welding starting point is connected to the welding end point, the welding material at the welding starting point will accumulate in the molten pool at the welding end point, thereby improving the welding quality.

[0020] In one embodiment, the section to be welded is configured with a stop welding position. The welding head stops welding after welding from one end of the section to be welded along a first direction to the stop welding position, and then welds in the reverse direction to complete the welding of the unwelded area on the section to be welded.

[0021] The welding method of the embodiment of the present application makes one end of the section to be welded serve as the welding starting point for welding along the first direction of the welding head, and the other end of the section to be welded serves as the welding starting point for reverse welding. Both ends of the section to be welded are welding starting points, which can reduce the risk of the welding end points of two adjacent sections to be welded being located at the same place, which is conducive to improving the welding quality.

[0022] In one embodiment, after the welding head performs reverse welding to a stop position, it continues to weld in the reverse direction.

[0023] In the welding method of the embodiment of the present application, after the welding head is reversely welded to the stop welding position, reverse welding is continued, that is, welding is performed twice near the stop welding position to form two welds, and the two welds are stacked near the stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the section to be welded.

[0024] In one embodiment, the area to be welded further includes a third section to be welded and a fourth section to be welded located on the other opposite sides of the end cover; the first section to be welded includes a first end and a second end disposed oppositely, the second section to be welded includes a third end and a fourth end disposed oppositely, the third section to be welded is connected between the first end and the third end, and the fourth section to be welded is connected between the second end and the fourth end;

[0025] The welding equipment further includes a third welding head and a fourth welding head, and a second welding station is formed between the third welding head and the fourth welding head;

[0026] The fixture is moved to the second welding station, the third welding head welds the third section to be welded through the air avoidance structure, and the fourth welding head welds the fourth section to be welded through the air avoidance structure.

[0027] In the welding method of the embodiment of the present application, the first welding head and the second welding head complete the welding of the end cover and the shell on two opposite sides, and the third welding head and the fourth welding head complete the welding of the end cover and the shell on the other opposite sides. In this way, the full circle welding of the end cover and the shell can be completed, so that the end cover completely seals the internal space of the shell.

[0028] In one embodiment, the first welding head welds the first to-be-welded section along a distribution direction from the first end toward the second end, and the second welding head welds the second to-be-welded section along a distribution direction from the fourth end toward the third end;

[0029] The third welding head welds the third area to be welded along a distribution direction from the third end toward the first end, and the fourth welding head welds the fourth area to be welded along a distribution direction from the second end toward the fourth end.

[0030] According to the welding method of the embodiment of the present application, during welding, the first welding head is welded from the first end to the second end, the fourth welding head is welded from the second end to the fourth end, the second welding head is welded from the fourth end to the third end, and the third welding head is welded from the third end to the fourth end, so that the first end, the second end, the third end and the fourth end are both the welding starting point of one welding head and the welding end point of another welding head, so that the welding process will not end at the same position, thereby reducing the risk of welding defects and helping to improve the welding quality.

[0031] In one embodiment, the first welding head welds the first to-be-welded section along a distribution direction from the first end toward the second end, and the second welding head welds the second to-be-welded section along a distribution direction from the third end toward the fourth end;

[0032] The third welding head welds the third area to be welded along a distribution direction from the first end toward the third end, and the fourth welding head welds the fourth area to be welded along a distribution direction from the second end toward the fourth end.

[0033] According to the welding method of the embodiment of the present application, during welding, the first welding head is welded from the first end to the second end, the second welding head is welded from the third end to the fourth end, the third welding head is welded from the first end to the third end, and the fourth welding head is welded from the second end to the fourth end, thereby completing the full circle welding of the end cover and the shell; in addition, the welding direction of the first welding head is the same as the welding direction of the second welding head, and the welding direction of the third welding head is the same as the welding direction of the fourth welding head, so the welding operation is simpler and easier to implement.

[0034] In one embodiment, the second welding head welds the second to-be-welded section along a distribution direction from the third end toward the fourth end and then welds the second to-be-welded section in a reverse direction toward the fourth end;

[0035] And / or, the fourth welding head welds the fourth section to be welded along a distribution direction from the second end toward the fourth end and then welds the fourth section to be welded in the reverse direction toward the second end.

[0036] In the welding method of the embodiment of the present application, the welding material of the reverse welding will be accumulated at the fourth end, reducing the risk of insufficient molten pool and improving the welding quality at the fourth end.

[0037] In a second aspect, a welding device is provided, comprising a first welding head, a second welding head, and a jig, wherein the jig is used to support a housing with an end cap, and the jig is configured with an airtight structure for exposing a welding area between the end cap and the housing;

[0038] A welding station is formed between the first welding head and the second welding head;

[0039] When the jig is located at the welding station, the first welding head and the second welding head respectively weld the sections to be welded located on opposite sides of the end cover through the air avoidance structure.

[0040] According to the welding device of the embodiment of the present application, when welding, the shell covered with the end cover is first fixed in a jig. At this time, the first welding head and the second welding head are respectively located on opposite sides of the shell covered with the end cover. Afterwards, the first welding head and the second welding head respectively weld the sections to be welded on opposite sides of the shell covered with the end cover. In this way, the opposite sides of the shell covered with the end cover are welded simultaneously, thereby improving the welding efficiency.

[0041] In one embodiment, the welding device further includes a first moving member connected to the first welding head and configured to drive the first welding head to move relative to the jig so that the first welding head welds the corresponding section to be welded;

[0042] The welding device also includes a second moving member, which is connected to the second welding head and is used to drive the second welding head to move relative to the fixture so that the second welding head welds the corresponding section to be welded.

[0043] In the welding device of the embodiment of the present application, the first movable member and the second movable member respectively drive the first welding head and the second welding head to move. The overall structure of the welding device is simple and convenient to process and manufacture.

[0044] In one embodiment, the welding device further comprises a clamping mechanism, which is located at the welding station and is used to clamp and fix the shell.

[0045] In the welding device of the embodiment of the present application, the clamping mechanism can realize the positioning of the shell, so that the first welding head and the second welding head can accurately weld the corresponding sections to be welded, thereby improving the welding accuracy.

[0046] In one embodiment, the clamping mechanism includes a fixing plate and a first side plate and a second side plate connected to the fixing plate. The first side plate, the second side plate and the fixing plate are collectively arranged to form a clamping groove for clamping the shell.

[0047] The welding device of the embodiment of the present application has a simple structure of the clamping mechanism, and the welding device is easy to manufacture and process.

[0048] In one embodiment, the first side plate is located between the first welding head and the jig, and the second side plate is located between the second welding head and the jig.

[0049] The welding device of the embodiment of the present application can realize the positioning of the shell between the first welding head and the second welding head through the first side plate and the second side plate, so that the distance between the first welding head, the second welding head and the corresponding section to be welded is within a suitable range, and the welding quality is good.

[0050] In one embodiment, the welding device further includes a moving mechanism, which is used to drive the jig to move so that the first welding head welds the corresponding section to be welded, and the second welding head welds the corresponding section to be welded.

[0051] In the welding device of the embodiment of the present application, during the actual welding process, the jig does not need to stop and can directly pass between the first welding head and the second welding head to achieve welding, which can greatly improve the welding efficiency; in addition, during the welding process, the first welding head and the second welding head are relatively stationary and do not need to move, which is also conducive to improving the accuracy of the welding position and improving the welding precision.

[0052] In one embodiment, the moving mechanism includes a first conveyor belt assembly and a second conveyor belt assembly that are spaced apart. The first conveyor belt assembly and the second conveyor belt assembly can clamp the shell and enable the shell to move under the conveyance of the first conveyor belt assembly and the second conveyor belt assembly.

[0053] In the welding device of the embodiment of the present application, the first conveyor belt assembly and the second conveyor belt assembly can clamp the shell and also play a positioning role for the shell, which is conducive to improving the welding accuracy.

[0054] In one embodiment, the fixture is constructed with a clamping plate and a receiving groove for receiving the shell with the end cover. The clamping plate is located at the opening of the receiving groove and presses on the shell and pushes the shell toward the end cover to clamp and fix the end cover and the shell.

[0055] In the welding device of the embodiment of the present application, the pressing plate presses and fixes the shell on the shell, and the end cover and the shell can be stably fixed together, thereby eliminating the need for pre-welding operations and improving welding efficiency.

[0056] In a third aspect, a welding device is provided, comprising the above-mentioned welding device.

[0057] The welding equipment of the embodiment of the present application adopts the above-mentioned welding device, which has high welding efficiency and can also improve the welding efficiency of the welding equipment.

[0058] In one embodiment, a welding apparatus includes a conveying device, a first welding device, and a second welding device;

[0059] The first welding device is a welding device, the welding station in the first welding device is a first welding station, and the first welding head in the first welding device and the second welding head in the first welding device are capable of respectively welding the sections to be welded located on opposite sides of the end cover;

[0060] The second welding device is a welding device, the welding station in the second welding device is a second welding station, and the first welding head in the second welding device and the second welding head in the second welding device are capable of respectively welding the sections to be welded located on the other two opposite sides of the end cover;

[0061] The conveying device can move the jig from the first welding station to the second welding station.

[0062] The welding equipment of the embodiment of the present application uses the first welding head and the second welding head in the first welding device to simultaneously weld the opposite sides of the end cover, and the first welding head and the second welding head in the second welding device to respectively weld the other opposite sides of the end cover, thereby achieving high welding efficiency.

[0063] In a fourth aspect, a battery cell is provided. The battery cell includes a shell and an end cover. The end cover is covered on the shell, and the end cover and the shell are welded using the above-mentioned welding method.

[0064] The battery cell, end cover and shell of the embodiment of the present application are welded using the above-mentioned welding method, which has high welding efficiency, is conducive to improving the production efficiency of the battery cell and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0066] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application.

[0067] FIG2 is a schematic structural diagram of a battery provided in an embodiment of the present application.

[0068] FIG3 is a schematic structural diagram of a battery cell provided in an embodiment of the present application.

[0069] FIG. 4 is an exploded schematic diagram of the battery cell shown in FIG. 3 .

[0070] FIG5 is a schematic structural diagram of a welding device provided in an embodiment of the present application.

[0071] FIG6 is a schematic diagram of welding at the first welding station in FIG5 .

[0072] FIG. 7 is a welding flow chart at the first welding station in FIG. 5 .

[0073] FIG8 is a schematic diagram of welding at the second welding station in FIG5 .

[0074] FIG. 9 is a welding flow chart at the second welding station in FIG. 5 .

[0075] FIG10 is a schematic structural diagram of a welding device provided in another embodiment of the present application.

[0076] FIG11 is a schematic diagram of welding at the first welding station in FIG10 .

[0077] FIG12 is a welding flow chart at the first welding station in FIG11 .

[0078] FIG13 is a schematic diagram of welding at the second welding station in FIG11 .

[0079] FIG. 14 is a welding flow chart at the second welding station in FIG. 11 .

[0080] FIG15 is a structural schematic diagram of a welding device provided in one embodiment of the present application from one perspective.

[0081] FIG16 is a schematic structural diagram of the welding device shown in FIG15 from another perspective.

[0082] FIG17 is a structural schematic diagram of a welding device provided in another embodiment of the present application from one perspective.

[0083] FIG18 is a schematic structural diagram of the welding device shown in FIG17 from another perspective.

[0084] FIG19 is a structural schematic diagram of a welding device provided in another embodiment of the present application from one perspective.

[0085] FIG20 is a schematic structural diagram of the welding device shown in FIG20 from another perspective.

[0086] FIG21 is a schematic structural diagram of the first sub-jig in FIG17 from one perspective.

[0087] FIG22 is a schematic structural diagram of the first sub-jig in FIG17 from another perspective.

[0088] FIG23 is a structural schematic diagram of the first sub-jig in FIG17 from another perspective.

[0089] 1000, vehicle; 1100, battery; 1200, controller; 1300, motor; 10, housing; 11, first section; 12, second section; 20, battery cell; 21, housing; 22, end cap; 221, electrode terminal; 222, pressure relief mechanism; 23, electrode assembly; 24, area to be welded; 241, first section to be welded; 242, second section to be welded; 243, third section to be welded; 244, fourth section to be welded; 240, section to be welded;

[0090] 100. Welding device; 1001. Welding station; 1002. Welding head; 101. First welding head; 102. Second welding head; 103. Fixture; 1031. First sub-fixture; 10311. Pressing plate; 10312. Accommodating groove; 1032. Avoidance structure; 10321. First avoidance substructure; 104. First moving member; 105. Second moving member; 106. Clamping mechanism; 1061. Fixed plate; 1062. First side plate; 1063. Second side plate; 1064. Clamping groove; 107. Moving mechanism; 1071. First conveyor belt assembly; 1072. Second conveyor belt assembly; 108. First driving member; 109. Second driving member; 110. Third driving member; 111. Fourth driving member;

[0091] 200, welding equipment; 210, conveying device; 220, first welding device; 230, second welding device; 231, third welding head; 232, fourth welding head; 2201, first welding station; 2202, first trimming station; 2203, transfer station; 2204, second welding station; 2205, second trimming station; 2206, assembly station. DETAILED DESCRIPTION

[0092] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0093] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0094] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0095] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0096] In the description of this application, it should be noted that the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0097] It should also be noted that, in the embodiments of the present application, the same figure mark represents the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0098] In this application, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0099] In this application, for the convenience of description, the Z-axis in the accompanying drawings represents the up and down direction, the positive direction of the Z-axis represents up, and the negative direction of the Z-axis represents down; the Y-axis in the accompanying drawings represents the front and back direction, the positive direction of the Y-axis represents back, and the negative direction of the Y-axis represents front; the X-axis in the accompanying drawings represents the left and right direction, the positive direction of the X-axis represents right, and the negative direction of the X-axis represents left.

[0100] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0101] With the rapid development of the battery industry, the production efficiency requirements for batteries are becoming increasingly higher. At the same time, higher requirements are also placed on the welding process during the battery production process. The most important process in the welding process of battery cells is the welding and packaging of the shell and end caps. During welding, the electrode assembly with the end cap part is installed in the shell, and then the periphery of the end cap is welded together with the periphery of the shell opening, so that the shell and end cap form a whole. However, the welding efficiency of the end cap and shell is low and cannot meet the higher production efficiency requirements.

[0102] The applicant found that the main reason for the low welding efficiency between the shell and the end cover is that during the welding process of the shell and the end cover, after the end cover is closed on the opening of the shell, the welding head needs to move around the end cover to weld the periphery of the end cover and the periphery of the shell opening together. This welding method takes a long time and has low welding efficiency, which limits the improvement of production efficiency and reduces the production efficiency of battery cells.

[0103] In order to improve the welding efficiency between the shell and the end cover, the applicant has designed a welding method after in-depth research. This welding method uses a first welding head and a second welding head to weld the shell and the end cover from opposite sides of the end cover respectively. Compared with the welding method using a circle, this welding method has high welding efficiency.

[0104] The welding method, welding device, welding equipment disclosed in the embodiments of the present application, the battery cell obtained by the welding method, the battery, and the electrical device using the battery as a power source, of course, the welding method can also be applied to welding between end caps and housings in other products; the electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0105] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0106] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1100 is provided inside the vehicle 1000, and the battery 1100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 1100 can be used to power the vehicle 1000. For example, the battery 1100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to power the motor 1300, for example, for starting, navigating and driving the vehicle 1000.

[0107] In some embodiments of the present application, the battery 1100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0108] Referring to Figure 2 , an embodiment of a battery 1100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10. The housing 10 provides a storage space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cells 20. The second portion 12 can be a hollow structure with one end open, and the first portion 11 can be a plate-like structure, overlapping the open side of the second portion 12, so that the first and second portions 11 and 12 together define a storage space. Alternatively, the first and second portions 11 and 12 can each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first and second portions 11 and 12 can have various shapes, such as a cylinder or a rectangular parallelepiped.

[0109] In the battery 1100 , there may be multiple battery cells 20 , and the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are connected in both series and in parallel.

[0110] In one embodiment, multiple battery cells 20 may be directly connected in series, parallel, or hybrid, and the entire battery cell 20 may then be housed within the housing 10. Alternatively, the battery 1100 may be constructed by first connecting multiple battery cells 20 in series, parallel, or hybrid to form a battery module, which is then connected in series, parallel, or hybrid to form a complete battery module, and then housed within the housing 10. The battery 1100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0111] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be flat, rectangular, or in other shapes.

[0112] As another embodiment of the battery 1100 , the battery 1100 may not include the housing 10 , but may be assembled into an electrical device by electrically connecting a plurality of battery cells 20 and forming a whole with necessary fixing structures.

[0113] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application, and Figure 4 is a schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. As shown in Figure 3, a battery cell 20 includes a housing 21, an end cap 22, an electrode assembly 23, and other functional components.

[0114] The end cap 22 is a component that covers the opening of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. Optionally, the end cap 22 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 22 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. Functional components such as electrode terminals 221 can be provided on the end cap 22. The electrode terminals 221 can be used to electrically connect to the electrode assembly 23 for inputting or outputting electrical energy from the battery cell 20. In some embodiments, the end cap 22 can also be provided with a pressure relief mechanism 222 for relieving internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this. In some embodiments, an insulating member may be provided inside the end cap 22 to isolate the electrical connection components in the housing 21 from the end cap 22 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0115] The shell 21 is a component used to cooperate with the end cap 22 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components. The shell 21 and the end cap 22 can be independent components. An opening can be set on the shell 21, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 22. Specifically, the end cap 22 and the shell 21 can form a common connection surface before other components are inserted into the shell. When the interior of the shell 21 needs to be encapsulated, the end cap 22 is then covered with the shell 21. The shell 21 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 21 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0116] The electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 23 may be contained within the housing 21. The electrode assembly 23 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 20, active ions (such as lithium ions) are embedded in and extracted from the positive electrode and the negative electrode. The separator is provided between the positive electrode and the negative electrode to reduce the short circuit between the positive and negative electrodes while allowing the active ions to pass through.

[0117] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0118] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0119] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0120] In some embodiments, the electrode assembly 23 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0121] In some embodiments, the electrode assembly 23 is a laminated structure.

[0122] In conjunction with FIG3 , FIG5 and FIG6 , in one embodiment of the present application, a welding method is provided, comprising the following steps:

[0123] The housing 21 covered with the end cap 22 is placed in a jig 103. The jig 103 is configured with an airtight structure to expose the area 24 to be welded between the end cap 22 and the housing 21. The area 24 to be welded includes a first section 241 to be welded and a second section 242 to be welded located on opposite sides of the end cap 22.

[0124] The jig 103 is moved to the first welding station 2201 of the welding equipment 200, the first welding head 101 of the welding equipment 200 welds the first section to be welded 241 through the air-avoiding structure, and the second welding head 102 of the welding equipment 200 welds the second section to be welded 242 through the air-avoiding structure, wherein the first welding station 2201 is located between the first welding head 101 and the second welding head 102.

[0125] The jig 103 is a component for receiving and fixing the housing 21 covered with the end cover 22. The housing 21 covered with the end cover 22 is relatively fixed to the end cover 22 in the jig 103, thereby facilitating subsequent welding operations.

[0126] The welding equipment 200 refers to equipment capable of welding the end cover 22 and the shell 21 together, wherein the welding equipment 200 may be laser welding equipment, electric welding equipment, gas welding equipment, etc.

[0127] The first welding head 101 refers to an executive component in the welding equipment 200 for implementing welding, and the second welding head 102 refers to another executive component in the welding equipment 200 for implementing welding; for example, as shown in Figure 5, the first welding head 101 and the second welding head 102 can be laser welding heads. Of course, in other embodiments, the first welding head 101 and the second welding head 102 can also be electric welding heads, etc., which can be set according to actual welding needs and are not limited here.

[0128] The shell 21 is covered with an end cover 22. It can be understood that the end cover 22 covers the opening of the shell 21, and the periphery of the end cover 22 and the periphery of the opening of the shell 21 need to be welded in a circle, so as to connect the end cover 22 and the shell 21 as a whole. At the same time, the internal space formed by the end cover 22 and the shell 21 can also be sealed; wherein, the shape of the end cover 22 is adapted to the shape of the opening of the shell 21, so that the opening of the shell 21 can be completely closed; the shape of the end cover 22 can be a regular shape such as a triangle, a quadrilateral, a pentagon, or of course it can also be an irregular shape, which is not limited here; for example, as shown in Figures 3 and 4, the end cover 22 can be the end cover 22 in the battery cell 20, and the shell 21 can be the shell 21 in the battery cell 20. After the end cover 22 and the shell 21 are covered and welded together, a seal can be achieved to reduce the risk of leakage. The shape of the end cover 22 is a rectangle, and the shell 21 is a cuboid.

[0129] The area to be welded 24 between the end cover 22 and the shell 21 refers to the connection area between the end cover 22 and the shell 21. For example, as shown in Figures 3 and 5, the area to be welded 24 refers to the area formed by the periphery of the end cover 22 and the periphery of the opening of the shell 21 and which needs to be welded, wherein the first section to be welded 241 refers to the area section of the area to be welded 24 located on one side of the end cover 22, and the second section to be welded 242 refers to the area section of the area to be welded 24 located on the other side of the end cover 22, and the first section to be welded 241 and the second section to be welded 242 are located on opposite sides of the end cover 22; the first section to be welded 241 can refer to the area that needs to be welded at one side of the end cover 22, and similarly, the second section to be welded 242 can refer to the area that needs to be welded at one side of the end cover 22. For example, as shown in Figure 7, the first section to be welded 241 refers to the area section that needs to be welded at the long side of the rear side of the end cover 22, and the second section to be welded 242 refers to the area section that needs to be welded at the long side of the front side of the end cover 22.

[0130] The air avoidance structure refers to a structure that can expose the area to be welded 24. For example, as shown in Figures 15 and 16, the air avoidance structure is a through hole opened on both sides of the fixture 103; for another example, as shown in Figures 21 to 23, the air avoidance structure is an opening located on the front and rear sides of the accommodating groove 10312. Of course, in other examples, it can also be other structures, which are not limited here.

[0131] The jig 103 is moved to the first welding station 2201 of the welding apparatus 200. It is understood that the jig 103 can be moved to the first welding station 2201 manually or by the conveyor 210, but is not limited to this. The first welding station 2201 is located between the first welding head 101 and the second welding head 102, to which the jig 103 can be moved. For example, as shown in Figures 5 and 7, when the jig 103 is located at the first welding station 2201, the first welding head 101 and the first section to be welded 241 are located on the same side of the jig 103, and the second welding head 102 and the second section to be welded 24 are located on the other side of the jig 103.

[0132] The first welding head 101 of the welding equipment 200 welds the first section to be welded 241 through the air avoidance structure, and the second welding head 102 of the welding equipment 200 welds the second section to be welded 242 through the air avoidance structure. For example, the first welding head 101 and the second welding head 102 can be moved relative to the jig 103 so that the first welding head 101 welds the first section to be welded 241 through the air avoidance structure, and the second welding head 102 welds the second section to be welded 242 through the air avoidance structure.

[0133] The first welding head 101 and the second welding head 102 are moved relative to the jig 103 . It can be understood that the first welding head 101 can move relative to the jig 103 , and the second welding head 102 can also move relative to the jig 103 .

[0134] During the movement of the first welding head 101 relative to the jig 103, the welding position of the first welding head 101 in the first section to be welded 241 changes, thereby welding the entire section of the first section to be welded 241 together; for example, as shown in Figures 5 and 7, the first welding head 101 moves from left to right relative to the jig 103 along the long side of the rear side of the end cover 22, thereby welding the long side of the rear side of the end cover 22 and the long side of the rear side of the opening of the shell 21 together, thereby completing the welding of the first section to be welded 241.

[0135] The first welding head 101 can move relative to the jig 103. The first welding head 101 can move and the jig 103 can be fixed; the first welding head 101 can be fixed and the jig 103 can move; or the first welding head 101 and the jig 103 can move at the same time, but there is a speed difference between the two, so that the first welding head 101 can move relative to the jig 103.

[0136] During the movement of the second welding head 102 relative to the jig 103, the welding position of the second welding head 102 in the second section to be welded 242 changes, thereby welding the entire section of the second section to be welded 242 together; for example, as shown in Figures 5 and 7, the second welding head 102 moves from right to left relative to the jig 103 along the long side of the front side of the end cover 22, thereby welding the long side of the front side of the end cover 22 and the long side of the front side of the opening of the shell 21 together, thereby completing the welding of the second section to be welded 242.

[0137] The second welding head 102 can move relative to the jig 103. The second welding head 102 can move and the jig 103 can be fixed; the second welding head 102 can be fixed and the jig 103 can move; or the second welding head 102 and the jig 103 can move at the same time, but there is a speed difference between the two, so that the second welding head 102 can move relative to the jig 103.

[0138] According to the welding method of the embodiment of the present application, the shell 21 covered with the end cover 22 is first installed in the jig 103, and then the jig 103 and the shell 21 are moved to the first welding station 2201. At the same time, the first welding head 101 and the second welding head 102 are located on opposite sides of the jig 103; thereafter, the first welding head 101 and the second welding head 102 respectively weld the first section to be welded 241 and the second section to be welded 242 through the air avoidance structure, thereby realizing the welding of the opposite sides of the end cover 22. Compared with the welding method using a circle, this welding method has high welding efficiency.

[0139] In another embodiment of the present application, in combination with Figures 5 to 9, a welding method is provided, in which the area to be welded 24 includes multiple sections to be welded 240, each section to be welded 240 is correspondingly provided with a welding head 1002, and multiple sections to be welded 240 are connected end to end in sequence to form an annular structure, two of the multiple sections to be welded 240 are respectively the first section to be welded 241 and the second section to be welded 242, the welding head 1002 corresponding to the first section to be welded 241 is the first welding head 101, and the welding head 1002 corresponding to the second section to be welded 242 is the second welding head 102.

[0140] The welding head 1002 refers to an executive component in the welding equipment 200 for implementing welding; for example, as shown in Figure 5, the welding head 1002 can be a laser welding head. Of course, in other embodiments, the welding head 1002 can also be an electric welding head, etc., which can be set according to actual welding needs and is not limited here.

[0141] The section to be welded 240 refers to a region of the area to be welded 24 located on one side of the end cover 22 .

[0142] A plurality of sections to be welded 240 are connected end to end in sequence to form an annular structure, and each section to be welded 240 is correspondingly provided with a welding head 1002. A plurality of sections to be welded 240 are connected end to end in sequence to form an annular structure, that is, the periphery of the end cover 22 and the periphery of the opening of the shell 21 form the annular structure, and the annular structure is divided into a plurality of sections to be welded 240, and the welding heads 1002 are arranged in a one-to-one correspondence with the sections to be welded 240, that is, each welding head 1002 welds the corresponding section to be welded 240 in a one-to-one correspondence, so that the full circle welding of the end cover 22 and the shell 21 can be completed, so that the end cover 22 completely seals the internal space of the shell 21; in addition, the end cover 22 and the shell 21 are welded in sections by a plurality of welding heads 1002, and the welding efficiency is high.

[0143] In an actual welding process, the welding of two adjacent sections 240 to be welded in the area 24 to be welded is completed at the same position, so that a welding problem of insufficient molten pool may occur at the end of welding.

[0144] In another embodiment of the present application, in combination with FIG. 5 , FIG. 6 and FIG. 7 , the welding method provided is such that the welding directions of the two welding heads 1002 corresponding to a pair of opposite sections 240 to be welded among the multiple sections 240 to be welded are opposite.

[0145] The welding direction of the welding head 1002 refers to the direction in which the welding position moves during the welding process of the welding head 1002 welding the to-be-welded section 240 , and may also refer to the direction in which the welding head 1002 moves relative to the fixture 103 .

[0146] One of the two welding heads 1002 corresponding to a pair of opposite sections to be welded 240 in the multiple sections to be welded 240 can refer to the direction indicated by the hollow arrow on the rear side in Figure 6, that is, welding from left to right, and the other welding head 1002 can refer to the direction indicated by the hollow arrow on the front side in Figure 6, that is, welding from right to left.

[0147] In the welding method of the embodiment of the present application, the two welding heads 1002 corresponding to a pair of sections to be welded 240 have opposite welding directions, so that the welding starting points and welding end points of the two sections to be welded in the pair of sections to be welded 240 are distributed in opposite directions, which can reduce the risk of ending the welding at the same place and is conducive to improving the welding quality.

[0148] In another embodiment of the present application, in combination with FIG. 5 to FIG. 9 , the welding method provided is such that the welding starting point of one of any two adjacent sections 240 to be welded among a plurality of sections 240 to be welded is connected to the welding end point of the other.

[0149] The welding start point refers to the position where welding begins, and the welding end point refers to the position where welding ends.

[0150] In the welding method of the embodiment of the present application, the welding starting point of one of any two adjacent sections to be welded 240 among the multiple sections to be welded 240 is connected to the welding end point of the other, so that the welding end points of all the sections to be welded 240 will not overlap, which is beneficial to improving the welding quality and improving the sealing performance between the end cover 22 and the shell 21.

[0151] Among them, the welding directions of all welding heads 1002 can form a clockwise or counterclockwise ring, thereby obtaining a structure in which the welding starting point of one of any two adjacent sections 240 to be welded among the above-mentioned multiple sections 240 to be welded is connected to the welding end point of the other.

[0152] In another embodiment of the present application, in combination with FIG. 10 to FIG. 12 , the welding method provided is such that two welding heads 1002 corresponding to a pair of opposite sections 240 to be welded among the plurality of sections 240 to be welded have the same welding direction.

[0153] The welding direction of one of the two welding heads 1002 corresponding to a pair of relative sections to be welded 240 in the multiple sections to be welded 240 can be referred to the direction indicated by the hollow arrow located on the rear side and on the left in Figure 11, that is, welding from left to right, and the welding direction of the other welding head can be referred to the direction indicated by the hollow arrow located on the rear side and on the left in Figure 11, that is, welding from left to right.

[0154] In the welding method of the embodiment of the present application, the two welding heads 1002 corresponding to a pair of opposite sections 240 to be welded among the multiple sections 240 to be welded have the same welding direction, and the welding operation is simple and easy to implement.

[0155] In another embodiment of the present application, the welding method provided is shown in combination with Figures 10 to 14, and at least one welding head 1002 welds the corresponding section to be welded 240 along a first direction and then welds the corresponding section to be welded 240 in the reverse direction.

[0156] The first direction refers to the welding direction of the welding head 1002 corresponding to the section to be welded 240. For example, the first direction can be the direction shown as welding from one end of the section to be welded 240 to the other end of the section to be welded 240. It should be noted that the first direction of different welding heads 1002 is different and is specifically determined based on the shape of the corresponding section to be welded 240. For example, the first direction can refer to the direction indicated by the hollow arrow located at the rear and left in Figure 11, that is, welding from left to right; the reverse welding direction of the welding head can refer to the direction indicated by the hollow arrow located at the rear and right in Figure 11, that is, welding from right to left.

[0157] In the welding method of the embodiment of the present application, the welding head 1002 welds the corresponding section to be welded 240 along the first direction, and then welds the section to be welded 240 in the reverse direction. In this way, one end of the two ends of the section to be welded 240 is the welding starting point along the first direction, and the other end is the welding starting point of the reverse welding. This can reduce the risk of the welding end points of two adjacent sections to be welded 240 being located at the same place, thereby improving the welding quality. In addition, if the welding starting point is connected to the welding end point, the welding material at the welding starting point will accumulate in the molten pool at the welding end point, thereby improving the welding quality.

[0158] In another embodiment of the present application, in combination with Figures 10 and 11, a welding method is provided, in which the section to be welded 240 is constructed with a stop welding position, and the welding head 1002 stops welding after welding from one end of the section to be welded 240 along a first direction to the stop welding position, and the welding head 1002 then welds in the opposite direction to complete the welding of the unwelded area on the section to be welded 240.

[0159] The stop welding position refers to the position where the welding head 1002 stops welding the corresponding to-be-welded section 240 along the first direction, such as shown in FIG. 11 , and the position shown by I in FIG. 11 can be referred to.

[0160] In the welding method of the embodiment of the present application, after the welding head 1002 welds from one end of the section to be welded 240 along the first direction to the stop welding position, the welding head 1002 passes the other end of the section to be welded 240, and then the welding head 1002 reversely welds to the stop welding position. At this time, the welding head 1002 reversely welds the unwelded area on the section to be welded 240. This welding method allows one end of the section to be welded 240 to be used as the welding starting point for the welding head to weld along the first direction, and the other end of the section to be welded to be used as the welding starting point for reverse welding. Both ends of the section to be welded 240 are welding starting points, which can reduce the risk of the welding end points of two adjacent sections to be welded 240 being located at the same place, which is beneficial to improving the welding quality.

[0161] During this welding process, the welding head 1002 stops welding in advance before completing the welding section 240 so that the welding head 1002 can slow down in advance, thereby preparing for the reverse movement of the welding head 1002. The welding head 1002 can also be given a reverse welding command in advance, thereby improving the welding efficiency.

[0162] In another embodiment of the present application, in combination with FIG. 10 and FIG. 11 , a welding method is provided in which the welding head 1002 continues reverse welding after reverse welding to a stop position.

[0163] In the welding method of the embodiment of the present application, after the welding head 1002 is reversely welded to the stop welding position, reverse welding is continued, that is, welding is performed twice near the stop welding position to form two welds, and the two welds are stacked near the stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the section to be welded 240.

[0164] In another embodiment of the present application, the welding method provided is provided, wherein the area to be welded 24 further includes a third section to be welded 243 and a fourth section to be welded 244, the third section to be welded 243 and the fourth section to be welded 244 being located on the other opposite sides of the end cover 22, the first section to be welded 241 including a first end and a second end oppositely disposed, the second section to be welded 242 including a third end and a fourth end oppositely disposed, the third section to be welded 243 being connected between the first end and the third end; and the fourth section to be welded 244 being connected between the second end and the fourth end;

[0165] The welding device 200 further includes a third welding head 231 and a fourth welding head 232 , with a second welding station 2204 formed between the third welding head 231 and the fourth welding head 232 ;

[0166] The fixture 103 is moved to the second welding station 2204 , the third welding head 231 welds the third section to be welded 243 through the air-avoiding structure, and the fourth welding head 232 welds the fourth section to be welded 244 through the air-avoiding structure.

[0167] The first end refers to one of the two ends relatively set in the first section to be welded 241, and is the connection between the first section to be welded 241 and the third section to be welded 243; for example, as shown in Figures 6 and 7, the first end is located at the corner of the left rear side of the end cover 22, and the corner of the left rear side of the end cover 22 is arc-shaped, so that the first welding head 101 and the third welding head 231 will both weld the first end.

[0168] The second end refers to the other end of the two oppositely arranged ends in the first section to be welded 241, and is the connection between the first section to be welded 241 and the fourth section to be welded 244; for example, as shown in Figures 6 and 7, the second end is located at the corner on the right rear side of the end cover 22, and the corner on the right rear side of the end cover 22 is arc-shaped, so that the first welding head 101 and the fourth welding head 232 will both weld the second end.

[0169] The third end refers to one of the two ends relatively set in the second section to be welded 242, and is the connection between the second section to be welded 242 and the third section to be welded 243; for example, as shown in Figures 6 and 7, the third end is located at the corner of the left front side of the end cover 22, and the corner of the left front side of the end cover 22 is arc-shaped, so that the third welding head 231 and the second welding head 102 will both weld the third end.

[0170] The fourth end refers to the other end of the second section to be welded 242 that is relatively set, and is the connection between the second section to be welded 242 and the fourth section to be welded 244; for example, as shown in Figures 6 and 7, the fourth end is located at the corner of the right front side of the end cover 22, and the corner of the right front side of the end cover 22 is arc-shaped, so that the fourth welding head 232 and the second welding head 102 will both weld the fourth end.

[0171] The third section to be welded 243 refers to the area section to be welded 24 located on one side of the first section to be welded 241 and connected between the first end and the third end, and the fourth section to be welded 244 refers to the area section to be welded 24 located on the other side of the first section to be welded 241 and connected between the second end and the fourth end; and the first section to be welded 241, the second section to be welded 242, the third section to be welded 243 and the fourth section to be welded 244 are connected end to end to form an annular structure and are arranged around the outside of the end cover 22; wherein, the third section to be welded 243 and the fourth section to be welded 244 can refer to the area to be welded at one side of the end cover 22, which is specifically determined according to the shape of the end cover 22 and is not limited here; for example, as shown in Figure 7, the third section to be welded 243 refers to the area section to be welded at the long side of the left side of the end cover 22, and the fourth section to be welded 244 refers to the area section to be welded at the long side of the right side of the end cover 22.

[0172] The third welding head 231 refers to an executive component in the welding equipment 200 for implementing welding, and the fourth welding head 232 refers to another executive component in the welding equipment 200 for implementing welding; for example, as shown in Figure 5, the third welding head 231 and the fourth welding head 232 can be laser welding heads. Of course, in other embodiments, the third welding head 231 and the fourth welding head 232 can also be electric welding heads, etc., which can be set according to actual welding needs and are not limited here.

[0173] The jig 103 is moved to the second welding station 2204. It is understood that the jig 103 can be moved to the second welding station 2204 manually or by conveyor 210, but is not limited to this. The second welding station 2204 is located between the third welding head 231 and the fourth welding head 232, into which the jig 103 can be moved. For example, as shown in Figures 5 and 9, when the jig 103 is located in the second welding station 2204, the third welding head 231 and the third section to be welded 243 are located on the same side of the jig 103, and the fourth welding head 232 and the fourth section to be welded 24 are located on the other side of the jig 103.

[0174] The third welding head 231 welds the third section to be welded 243 through the air-avoiding structure, and the fourth welding head 232 welds the fourth section to be welded 244 through the air-avoiding structure; for example, the third welding head 231 and the fourth welding head 232 are moved relative to the jig 103 so that the third welding head 231 welds the third section to be welded 243 through the air-avoiding structure, and the fourth welding head 232 welds the fourth section to be welded 244 through the air-avoiding structure.

[0175] The third welding head 231 and the fourth welding head 232 are moved relative to the jig 103 . It can be understood that the third welding head 231 can move relative to the jig 103 , and the fourth welding head 232 can move relative to the jig 103 .

[0176] During the movement of the third welding head 231 relative to the jig 103, the welding position of the third welding head 231 in the third section to be welded 243 changes, thereby welding the entire section of the third section to be welded 243 together. For example, as shown in Figures 5 and 9, the third welding head 231 moves from front to back along the short side of the left side of the end cover 22 relative to the jig 103, welding the short side of the left side of the end cover 22 to the short side of the left side of the opening of the shell 21 together, thereby completing the welding of the third section to be welded 243.

[0177] The third welding head 231 can move relative to the jig 103. The third welding head 231 can move and the jig 103 can be fixed; the third welding head 231 can be fixed and the jig 103 can move; or the third welding head 231 and the jig 103 can move at the same time, but there is a speed difference between the two, so that the third welding head 231 can move relative to the jig 103.

[0178] During the movement of the fourth welding head 232 relative to the jig 103, the welding position of the fourth welding head 232 in the fourth section to be welded 244 changes, so that the entire section of the fourth section to be welded 244 can be welded together. For example, as shown in Figures 5 and 9, the fourth welding head 232 moves from back to front relative to the jig 103 along the short side on the right side of the end cover 22, and welds the short side on the left side of the end cover 22 to the short side on the left side of the opening of the shell 21, thereby completing the welding of the third section to be welded 243.

[0179] The fourth welding head 232 can move relative to the jig 103. The fourth welding head 232 can move and the jig 103 can be fixed; the fourth welding head 232 can be fixed and the jig 103 can move; or the fourth welding head 232 and the jig 103 can move at the same time, but there is a speed difference between the two, so that the fourth welding head 232 can move relative to the jig 103.

[0180] In the welding method of the embodiment of the present application, the jig 103 is moved to the second welding station 2204. At the same time, the third welding head 231 and the fourth welding head 232 are respectively located on opposite sides of the jig 103; thereafter, the third welding head 231 and the third welding head 231 are moved relative to the jig 103 and the third welding head 231 and the fourth welding head 232 are opened, so that the third welding head 231 and the fourth welding head 232 respectively weld the third section to be welded 243 and the fourth section to be welded 244 through the air-avoiding structure, thereby completing the welding of the end cover 22 and the shell 21 on the other opposite sides. The welding of the end cover 22 and the shell 21 on the opposite sides is completed at the first welding head 101 and the second welding head 102, and the welding of the end cover 22 and the shell 21 on the other opposite sides is completed at the third welding head 231 and the fourth welding head 232. In this way, the full circle welding of the end cover 22 and the shell 21 can be completed, so that the end cover 22 completely seals the internal space of the shell 21.

[0181] In this process, the full circle welding of the end cover 22 and the shell 21 can be divided into two steps. The first step is to weld the end cover 22 and the shell 21 on two opposite sides, and the second step is to weld the other opposite sides of the end cover 22 and the shell 21. The welding difficulty is small and the welding efficiency can be further improved.

[0182] For example, as shown in FIG7 , the section to be welded 240 may refer to the section to be welded 24 at the rear long side of the end cap 22, i.e., the first section to be welded 241; it may also refer to the section to be welded 24 at the front long side of the end cap 22, i.e., the second section to be welded 242; it may also refer to the section to be welded 24 at the left short side of the end cap 44, i.e., the third section to be welded 243; it may also refer to the section to be welded 24 at the right short side of the end cap 22, i.e., the fourth section to be welded 244; and here, It should be noted that the first welding head 101 welds the area segment located at the long side of the rear side of the end cover 22, that is, the first section to be welded 241; the second welding head 102 welds the area segment located at the long side of the front side of the end cover 22, that is, the second section to be welded 242; of course, in other embodiments, the first welding head 101 welds the area segment located at the short side of the left side of the end cover 22, that is, the third section to be welded 243; the second welding head 102 welds the area segment located at the short side of the right side of the end cover 22, that is, the fourth section to be welded 244.

[0183] In the actual welding process, changes in the welding speed of the welding head will lead to unstable welding energy, which may increase the risk of welding defects and thus affect the welding quality.

[0184] In another embodiment of the present application, in combination with FIG5, FIG6 and FIG7, the welding method provided is that the first welding head 101 has a first end position and a second end position, and the first section to be welded 241 is located between the first end position and the second end position; during the process of the first welding head 101 welding the first section to be welded 241, the first welding head 101 is turned on and moves from the first end position toward the second end position, and starts welding the first section to be welded 241 after reaching the preset welding speed of the first welding head 101, and welds the first section to be welded 241 at the preset welding speed of the first welding head 101; when the first welding head 101 01 moves to the second end position and then stops moving; and / or, the second welding head 102 has a third end position and a fourth end position, and the second section to be welded 242 is located between the third end position and the fourth end position; during the process of the second welding head 102 welding the second section to be welded 242, the second welding head 102 is turned on and moves from the third end position toward the fourth end position, and starts welding the second section to be welded 242 after reaching the preset welding speed of the second welding head 102, and welds the second section to be welded 242 at the preset welding speed of the second welding head 102; when the second welding head 102 moves to the fourth end position, it stops moving.

[0185] In one possible design, the first welding head 101 has a first end position and a second end position, and the first section to be welded 241 is located between the first end position and the second end position; during the process of the first welding head 101 welding the first section to be welded 241, the first welding head 101 is turned on and moves from the first end position toward the second end position, and starts welding the first section to be welded 241 after reaching the preset welding speed of the first welding head 101, and welds the first section to be welded 241 at the preset welding speed of the first welding head 101; when the first welding head 101 moves to the second end position, it stops moving; wherein the first end position and the second end position are the opposite end points of the moving path of the first welding head 101, and the first welding head 101 moves between the first end position and the second end position; for example, as shown in Figure 6, the moving path of the first welding head 101 is the path shown by the hollow arrow on the rear side, the first end position is the starting point of the hollow arrow on the rear side, that is, the position shown by arrow A; the second end position is the end point of the hollow arrow on the rear side, that is, the position shown by arrow B.

[0186] The first section to be welded 241 is located between the first end point and the second end point; it can be understood that the first end point and the second end point are located on opposite sides of the first section to be welded 241. For example, as shown in Figure 6, in the length direction of the first section to be welded 241 (combined with the X direction shown in Figure 7), the distance between the first end point and the left side of the end cover 22 is L1, and the distance between the second end point and the right side of the end cover 22 is L2.

[0187] During the process of welding the first section to be welded 241 by the first welding head 101, the first welding head 101 is turned on and moves from the first end position toward the second end position, and starts welding the first section to be welded 241 after reaching the preset welding speed of the first welding head 101, and welds the first section to be welded 241 at the preset welding speed of the first welding head 101; when the first welding head 101 moves to the second end position, it stops moving; that is, the first welding head 101 needs to move a certain distance before moving from the first end position to the start of welding the first section to be welded 241, and the first welding head 101 can use this distance to gradually accelerate to the preset welding speed, and then continue to weld the first section to be welded 241 at the preset welding speed. 41, thus reducing the risk of welding defects caused by the acceleration of the first welding head 101, and helping to improve the welding quality at the end of the first section to be welded 241 (i.e., the corner of the end cover 22); in addition, after welding the first section to be welded 241, the first welding head 101 can decelerate after a distance until it stops at the second end position, so that the first welding head 101 does not need to decelerate during the welding of the first section to be welded 241 and can always maintain the preset welding speed for welding, and decelerate again after welding the first section to be welded 241, which can reduce the risk of welding defects caused by the deceleration of the first welding head 101, and help to improve the welding quality at the end of the first section to be welded 241 (i.e., the corner of the end cover 22). Among them, the preset welding speed of the first welding head 101 refers to the moving speed that the first welding head 101 needs to reach during the welding of the end cover 22 and the shell 21; among them, the preset welding speed of the first welding head 101 can be selected according to actual welding needs and is not limited here.

[0188] For example, as shown in Figures 5 and 6, the first welding head 101 is a laser welding head. After the first welding head 101 moves L1 from the first end point, the first welding head 101 reaches the preset welding speed, and then starts to weld the first section to be welded 241. After welding the first section to be welded 241, the first welding head 101 continues to move toward the second end point by slowing down L2 and then stops. At this time, the first welding head 101 is located at the second end point. This welding method enables the first section to be welded 241 to have good welding quality, which is beneficial to reducing welding defects and improving the yield rate.

[0189] In one embodiment, the preset welding speed of the first welding head 101 is greater than or equal to 300 mm / s, and the numerical range of L1 and the numerical range of L2 are 0 to 40 mm. This setting can greatly improve the welding efficiency of the end cover 22 and the shell 21 and improve production capacity; optionally, the numerical range of L1 and the numerical range of L2 are 17 mm to 20 mm.

[0190] For example, the preset welding speed of the first welding head 101 is 300 mm / s, L1 = 20 mm, L2 = 20 mm, which can achieve a production capacity of welding 22 shells 21 covered with end covers 22 per minute, and the welding efficiency is high.

[0191] In another possible design, the second welding head 102 has a third end position and a fourth end position, and the second section to be welded 242 is located between the third end position and the fourth end position; during the process of welding the second section to be welded 242 by the second welding head 102, the second welding head 102 is opened and moves from the third end position toward the fourth end position, and starts welding the second section to be welded 242 after reaching the preset welding speed of the second welding head 102, and welds the second section to be welded 242 at the preset welding speed of the second welding head 102; when the second welding head 102 moves to the fourth end position, it stops moving. The third end position and the fourth end position are the two opposite end points on the movement path of the second welding head 102, respectively, and the second welding head 102 moves between the third end position and the fourth end position; for example, as shown in Figure 6, the movement path of the second welding head 102 is located in the path indicated by the hollow arrow on the front side, the third end position is the starting point of the hollow arrow on the front side, that is, the position indicated by arrow C; the fourth end position is the end point of the hollow arrow on the front side, that is, the position indicated by arrow D.

[0192] The second section to be welded 242 is located between the third endpoint and the fourth endpoint; it can be understood that the third endpoint and the fourth endpoint are located on opposite sides of the second section to be welded 242. For example, as shown in Figure 6, in the length direction of the second section to be welded 242 (combined with the X direction shown in Figure 7), the distance between the third endpoint and the right side of the end cover 22 is L3, and the distance between the fourth endpoint and the left side of the end cover 22 is L4.

[0193] During the process of the second welding head 102 welding the second section to be welded 242, the second welding head 102 is turned on and moves from the third end position toward the fourth end position, and starts welding the second section to be welded 242 after reaching the preset welding speed of the second welding head 102, and welds the second section to be welded 242 at the preset welding speed of the second welding head 102; when the second welding head 102 moves to the fourth end position, it stops moving. That is to say, the second welding head 102 needs to move a certain distance before moving from the third end position to start welding the second section to be welded 242. At this time, the second welding head 102 can use the moving time of this distance to gradually accelerate to the preset welding speed, thereby reducing the risk of welding defects caused by the acceleration of the welding speed of the second welding head 102 and the unstable welding state. Then, the second section to be welded 242 is welded at the preset welding speed. In this way, the risk of welding defects caused by the acceleration of the second welding head 102 can be reduced, which is beneficial to improving the end of the second section to be welded 242 ( In addition, after welding the second section to be welded 242, the second welding head 102 can slow down after a distance until it stops at the fourth end position, so that the second welding head 102 can always maintain the preset welding speed for welding without slowing down during the welding of the second section to be welded 242, and then slow down again after welding the second section to be welded 242, which can reduce the risk of welding defects caused by the deceleration of the second welding head 102, and is conducive to improving the welding quality at the end of the second section to be welded 242 (i.e. the corner of the end cover 22). Among them, the preset welding speed of the second welding head 102 refers to the moving speed that the welding head needs to reach during the welding of the end cover 22 and the shell 21, and the preset welding speed of the second welding head 102 can be selected according to the actual welding needs and is not limited here.

[0194] For example, as shown in Figures 5 and 6, the second welding head 102 is a laser welding head. After the second welding head 102 moves L3 from the third end point, the second welding head 102 reaches the preset welding speed and then starts to weld the second section to be welded 242. After welding the second section to be welded 242, the second welding head 102 continues to move toward the fourth end point at a decelerated speed of L4 and then stops. At this time, the second welding head 102 is located at the fourth end point. This welding method enables the second section to be welded 242 to have good welding quality, which is beneficial to reducing welding defects and improving the yield rate.

[0195] In one embodiment, the preset welding speed of the second welding head 102 is greater than or equal to 300 mm / s, and the numerical range of L3 and the numerical range of L4 are 0 to 40 mm. This setting can greatly improve the welding efficiency of the end cover 22 and the shell 21 and improve production capacity; optionally, the numerical range of L3 and the numerical range of L4 are 17 mm to 20 mm.

[0196] For example, the preset welding speed of the second welding head 102 is 300 mm / s, L3=20 mm, L4=20 mm, which can achieve a production capacity of welding 22 shells 21 covered with end covers 22 per minute, and the welding efficiency is high.

[0197] In another possible design, the first welding head 101 has a first end position and a second end position, and the first section to be welded 241 is located between the first end position and the second end position; during the process of welding the first section to be welded 241 by the first welding head 101, the first welding head 101 is turned on and moves from the first end position toward the second end position, and starts welding the first section to be welded 241 after reaching the preset welding speed of the first welding head 101, and welds the first section to be welded 241 at the preset welding speed of the first welding head 101; when the first welding head 101 moves to the second end position, it stops. Move; and / or, the second welding head 102 has a third end position and a fourth end position, and the second section to be welded 242 is located between the third end position and the fourth end position; during the process of welding the second section to be welded 242 by the second welding head 102, the second welding head 102 is opened and moves from the third end position toward the fourth end position, and after reaching the preset welding speed of the second welding head 102, the second section to be welded 242 begins to be welded, and the second section to be welded 242 is welded at the preset welding speed of the second welding head 102; when the second welding head 102 moves to the fourth end position, it stops moving. From the above analysis, it can be seen that the first section to be welded 241 and the second section to be welded 242 can be well welded, and the welding quality is good, which is conducive to improving the yield rate and reducing the production cost.

[0198] In another embodiment of the present application, in combination with FIG5, FIG8 and FIG9, the welding method provided is that the third welding head 231 has a fifth end position and a sixth end position, and the third section to be welded 243 is located between the fifth end position and the sixth end position; in the process of the third welding head 231 welding the third section to be welded 243, the third welding head 231 is turned on and moves from the fifth end position toward the sixth end position, and starts welding the third section to be welded 243 after reaching the preset welding speed of the third welding head 231, and welds the third section to be welded 243 at the preset welding speed of the third welding head 231; when the third welding head 231 is welded, the third welding head 231 is opened and moves from the fifth end position toward the sixth end position, and starts welding the third section to be welded 243 after reaching the preset welding speed of the third welding head 231. 31 moves to the sixth endpoint position and then stops moving; and / or, the fourth welding head 232 has a seventh endpoint position and an eighth endpoint position, and the fourth section to be welded 244 is located between the seventh endpoint position and the eighth endpoint position; in the process of the fourth welding head 232 welding the fourth section to be welded 244, the fourth welding head 232 is turned on and moves from the seventh endpoint position toward the eighth endpoint position, and starts welding the fourth section to be welded 244 after reaching the preset welding speed of the fourth welding head 232, and welds the fourth section to be welded 244 at the preset welding speed of the fourth welding head 232; when the fourth welding head 232 moves to the eighth endpoint position, it stops moving.

[0199] In one possible design, the third welding head 231 is constructed with a fifth endpoint and a sixth endpoint, and the third section to be welded 243 is located between the fifth endpoint and the sixth endpoint; in the process of the third welding head 231 welding the third section to be welded 243, the third welding head 231 is opened and moves from the fifth endpoint toward the sixth endpoint, and starts welding the third section to be welded 243 when the preset welding speed of the third welding head 231 is reached, and welds the third section to be welded 243 at the preset welding speed of the third welding head 231; when the third welding head 231 moves to the sixth endpoint, it stops moving; wherein the fifth endpoint and the sixth endpoint are the opposite end points of the movement path of the third welding head 231, respectively, and the third welding head 231 moves between the fifth endpoint and the sixth endpoint; for example, as shown in Figure 8, the movement path of the third welding head 231 is the path shown by the hollow arrow on the left, the fifth endpoint is the starting point of the hollow arrow on the left, that is, the position shown by arrow E; the sixth endpoint is the end point of the hollow arrow on the left, that is, the position shown by arrow F.

[0200] The third section to be welded 243 is located between the fifth endpoint and the sixth endpoint; it can be understood that the fifth endpoint and the sixth endpoint are located on opposite sides of the third section to be welded 243. For example, as shown in Figure 8, in the length direction of the third section to be welded 243 (combined with the Y direction shown in Figure 8), the distance between the fifth endpoint and the front side of the end cover 22 is L5, and the distance between the sixth endpoint and the rear side of the end cover 22 is L6.

[0201] During the process of the third welding head 231 welding the third section to be welded 243, the third welding head 231 is turned on and moves from the fifth end position toward the sixth end position, and starts welding the third section to be welded 243 after reaching the preset welding speed of the third welding head 231, and welds the third section to be welded 243 at the preset welding speed of the third welding head 231; when the third welding head 231 moves to the sixth end position, it stops moving; that is, the third welding head 231 needs to move a distance before moving from the fifth end position to start welding the third section to be welded 243, and the third welding head 231 can use this distance to gradually reach the preset welding speed, and then continue to weld at the preset welding speed The third section to be welded 243 can reduce the risk of welding defects caused by the acceleration of the third welding head 231, which is beneficial to improving the welding quality at the end of the third section to be welded 243 (i.e., the corner of the end cover 22); in addition, after welding the third section to be welded 243, the third welding head 231 can decelerate after a distance until it stops at the sixth end position, so that the third welding head 231 does not need to decelerate during the welding process of the third section to be welded 243 and can always maintain the preset welding speed for welding, and decelerate again after welding the third section to be welded 243, which can reduce the risk of welding defects caused by the deceleration of the third welding head 231, which is beneficial to improving the welding quality at the third section to be welded 243. Among them, the preset welding speed of the third welding head 231 refers to the moving speed that the third welding head 231 needs to reach during the welding process of the end cover 22 and the shell 21; among them, the preset welding speed of the third welding head 231 can be selected according to actual welding needs and is not limited here.

[0202] For example, as shown in Figures 5 and 8, the third welding head 231 is a laser welding head. After the third welding head 231 moves L5 from the fifth end point, the third welding head 231 reaches the preset welding speed, and then starts to weld the third section to be welded 243. After welding the third section to be welded 243, the third welding head 231 continues to move toward the sixth end point by decelerating L6 and then stops. At this time, the third welding head 231 is located at the sixth end point. This welding method can make the third section to be welded 243 have good welding quality, which is beneficial to reduce welding defects and improve the yield rate.

[0203] In one embodiment, the preset welding speed of the third welding head 231 is greater than or equal to 300 mm / s, and the numerical range of L5 and the numerical range of L6 are 0 to 40 mm. This setting can greatly improve the welding efficiency of the end cover 22 and the shell 21 and improve production capacity; optionally, the numerical range of L5 and the numerical range of L6 are 17 mm to 20 mm.

[0204] For example, the preset welding speed of the third welding head 231 is 300 mm / s, L5=20 mm, L6=20 mm, which can achieve a production capacity of welding 22 shells 21 covered with end covers 22 per minute, and the welding efficiency is high.

[0205] In another possible design, the fourth welding head 232 has a seventh end position and an eighth end position, and the fourth section to be welded 244 is located between the seventh end position and the eighth end position. During the process of welding the fourth section to be welded 244 by the fourth welding head 232, the fourth welding head 232 is opened and moves from the seventh end position toward the eighth end position. After reaching the preset welding speed of the fourth welding head 232, the fourth section to be welded 244 begins to be welded, and the fourth section to be welded 244 is welded at the preset welding speed of the fourth welding head 232. When the fourth welding head 232 moves to the eighth end position, it stops moving. The seventh end position and the eighth end position are the opposite end points of the movement path of the fourth welding head 232, respectively, and the fourth welding head 232 moves between the seventh end position and the eighth end position. For example, as shown in Figure 8, the movement path of the fourth welding head 232 is the path indicated by the hollow arrow on the right side, the seventh end position is the starting point of the hollow arrow on the right side, that is, the position indicated by arrow G; the eighth end position is the end point of the hollow arrow on the right side, that is, the position indicated by arrow H.

[0206] The fourth section to be welded 244 is located between the seventh endpoint and the eighth endpoint; it can be understood that the seventh endpoint and the eighth endpoint are located on opposite sides of the fourth section to be welded 244. For example, as shown in Figure 8, in the length direction of the fourth section to be welded 244 (combined with the Y direction shown in Figure 8), the distance between the seventh endpoint and the rear side of the end cover 22 is L7, and the distance between the eighth endpoint and the front side of the end cover 22 is L8.

[0207] During the process of the fourth welding head 232 welding the fourth section to be welded 244, the fourth welding head 232 is opened and moves from the seventh end position toward the eighth end position, and starts welding the fourth section to be welded 244 after reaching the preset welding speed of the fourth welding head 232, and welds the fourth section to be welded 244 at the preset welding speed of the fourth welding head 232; when the fourth welding head 232 moves to the eighth end position, it stops moving. That is to say, the fourth welding head 232 needs to move a certain distance before moving from the seventh end point to starting to weld the fourth section to be welded 244. The fourth welding head 232 can use this distance to gradually accelerate to reach the preset welding speed, and then continue to weld the fourth section to be welded 244 at the preset welding speed. This can reduce the risk of welding defects caused by the acceleration of the fourth welding head 232, which is beneficial to improving the welding quality at the end of the fourth section to be welded 244 (that is, the corner of the end cover 22); in addition, after welding the fourth section to be welded 244, the fourth welding head 232 can decelerate after a certain distance until it stops at the eighth end point. In this way, the fourth welding head 232 does not need to decelerate during the process of welding the fourth section to be welded 244, and can always maintain the preset welding speed for welding, and decelerate again after welding the fourth section to be welded 244. This can reduce the risk of welding defects caused by the deceleration of the fourth welding head 232, which is beneficial to improving the welding quality at the end of the fourth section to be welded 244 (that is, the corner of the end cover 22). Among them, the preset welding speed of the fourth welding head 232 refers to the moving speed that the fourth welding head 232 needs to reach during the welding process of the end cover 22 and the shell 21; among them, the preset welding speed of the fourth welding head 232; can be selected according to actual welding needs and is not limited here.

[0208] For example, as shown in Figures 5 and 8, the fourth welding head 232 is a laser welding head. After the fourth welding head 232 moves L7 from the fifth end point, the fourth welding head 232 reaches the preset welding speed, and then starts to weld the fourth section to be welded 244. After welding the fourth section to be welded 244, the fourth welding head 232 continues to move toward the eighth end point at a decelerated speed of L8 and then stops. At this time, the fourth welding head 232 is located at the eighth end point. This welding method can make the fourth section to be welded 244 have good welding quality, which is beneficial to reduce welding defects and improve the yield rate.

[0209] In one embodiment, the preset welding speed of the fourth welding head 232 is greater than or equal to 300 mm / s, and the numerical range of L7 and the numerical range of L8 are 0 to 40 mm. This setting can greatly improve the welding efficiency of the end cover 22 and the shell 21 and improve production capacity; optionally, the numerical range of L7 and the numerical range of L8 are 17 mm to 20 mm.

[0210] For example, the preset welding speed of the fourth welding head 232 is 300 mm / s, L7=20 mm, L8=20 mm, which can achieve a production capacity of welding 22 shells 21 covered with end covers 22 per minute, and the welding efficiency is high.

[0211] In another possible design, the third welding head 231 has a fifth end position and a sixth end position, and the third section to be welded 243 is located between the fifth end position and the sixth end position; in the process of the third welding head 231 welding the third section to be welded 243, the third welding head 231 is turned on and moves from the fifth end position toward the sixth end position, and starts welding the third section to be welded 243 after reaching the preset welding speed of the third welding head 231, and welds the third section to be welded 243 at the preset welding speed of the third welding head 231; when the third welding head 231 moves to the sixth end position, it stops. Move; and / or, the fourth welding head 232 has a seventh end position and an eighth end position, and the fourth section to be welded 244 is located between the seventh end position and the eighth end position; during the process of the fourth welding head 232 welding the fourth section to be welded 244, the fourth welding head 232 is opened and moves from the seventh end position toward the eighth end position, and after reaching the preset welding speed of the fourth welding head 232, the fourth section to be welded 244 begins to be welded, and the fourth section to be welded 244 is welded at the preset welding speed of the fourth welding head 232; when the fourth welding head 232 moves to the eighth end position, it stops moving. From the above analysis, it can be seen that the third section to be welded 243 and the fourth section to be welded 244 can be well welded, and the welding quality is good, which is conducive to improving the yield rate and reducing the production cost.

[0212] In an actual welding process, the welding of two adjacent sections 240 to be welded in the area 24 to be welded is completed at the same position, so that a welding problem of insufficient molten pool may occur at the end of welding.

[0213] In another embodiment of the present application, in the welding method provided, a moving direction of the first welding head 101 relative to the jig 103 is opposite to a moving direction of the second welding head 102 relative to the jig 103 .

[0214] The moving direction of the first welding head 101 relative to the jig 103 can be, for example, the positive direction of the X-axis shown in FIG6 ; the moving direction of the second welding head 102 relative to the jig 103 can be, for example, the negative direction of the X-axis shown in FIG6 . Of course, other directions are also possible in other embodiments and are not limited here.

[0215] In the welding method of the embodiment of the present application, the moving direction of the first welding head 101 relative to the jig 103 is opposite to the moving direction of the second welding head 102 relative to the jig 103. In this way, the welding starting point and the welding end point of the first section to be welded 241 are opposite to the welding starting point and the welding end point of the second section to be welded 242. This can reduce the risk of ending the welding at the same place, which is conducive to improving the welding quality.

[0216] In another embodiment of the present application, in the welding method provided, a moving direction of the third welding head 231 relative to the jig 103 is opposite to a moving direction of the fourth welding head 232 relative to the jig 103 .

[0217] The movement direction of the third welding head 231 relative to the jig 103 can be, for example, the positive direction of the Y axis as shown in FIG8 ; the movement direction of the fourth welding head 232 relative to the jig 103 can be, for example, the negative direction of the Y axis as shown in FIG8 . Of course, other directions are also possible in other embodiments and are not limited here.

[0218] In the welding method of the embodiment of the present application, the moving direction of the third welding head 231 relative to the jig 103 is opposite to the moving direction of the fourth welding head 232 relative to the jig 103. In this way, the welding starting point and ending position of the third section to be welded 243 are opposite to the welding starting point and ending position of the fourth section to be welded 244. This can reduce the risk of ending the welding at the same place, which is conducive to improving the welding quality.

[0219] In another embodiment of the present application, a welding method is provided, in which the first welding head 101 welds the first section to be welded 241 along the distribution direction from the first end toward the second end relative to the jig 103, and the second welding head 102 welds the second section to be welded 242 along the distribution direction from the fourth end toward the third end; the third welding head 231 welds the third section to be welded 243 along the distribution direction from the third end toward the first end, and the fourth welding head 232 welds the fourth section to be welded 244 along the distribution direction from the second end toward the fourth end.

[0220] The first welding head 101 welds the first section to be welded 241 along the distribution direction from the first end toward the second end relative to the jig 103. For example, as shown in Figures 5, 6 and 7, the distribution direction from the first end toward the second end can refer to the direction indicated by the hollow arrow on the rear side shown in Figure 6, that is, the first welding head 101 moves from left to right for welding.

[0221] The second welding head 102 welds the second section to be welded 242 along the distribution direction from the fourth end toward the third end; for example, in combination with Figures 5, 6 and 7, the distribution direction from the fourth end toward the third end can refer to the direction indicated by the hollow arrow on the front side shown in Figure 6, that is, the second welding head 102 moves from right to left for welding.

[0222] The third welding head 231 welds the third section to be welded 243 along the distribution direction from the third end toward the first end. For example, as shown in Figures 5, 8 and 9, the distribution direction along the third end toward the first end can refer to the direction indicated by the hollow arrow on the left side shown in Figure 8, that is, the third welding head 231 moves from front to back for welding.

[0223] The fourth welding head 232 welds the fourth to-be-welded section 244 along a distribution direction from the second end toward the fourth end. For example, as shown in conjunction with Figures 5, 8, and 9, the distribution direction from the second end toward the fourth end can be referred to the direction indicated by the hollow arrow on the right side of Figure 8, that is, the fourth welding head 232 moves from back to front to weld.

[0224] In the welding method of the embodiment of the present application, during welding, the first welding head 101 is welded from the first end to the second end, the fourth welding head 232 is welded from the second end to the fourth end, the second welding head 102 is welded from the fourth end to the third end, and the third welding head 231 is welded from the third end to the fourth end, so that the first end, the second end, the third end and the fourth end are both the welding starting point of one welding head and the welding end point of another welding head, so that the welding process will not end at the same position, thereby reducing the risk of welding defects and helping to improve the welding quality.

[0225] 5 to 9 , the moving directions of the first welding head 101, the second welding head 102, the third welding head 231 and the fourth welding head 232 can form a ring that indicates clockwise rotation. Of course, in other embodiments, the ring can also indicate counterclockwise rotation. The moving directions of the first welding head 101, the second welding head 102, the third welding head 231 and the fourth welding head 232 can be set according to actual needs.

[0226] In another embodiment of the present application, in the welding method provided, a moving direction of the first welding head 101 relative to the jig 103 is the same as a moving direction of the second welding head 102 relative to the jig 103 .

[0227] The first welding head 101 can move relative to the fixture 103 in the X direction as shown in Figure 11 , and the second welding head 102 can move relative to the fixture 103 in the X direction as shown in Figure 11 . Of course, other directions are also possible in other embodiments and are not limited here.

[0228] In the welding method of the embodiment of the present application, the moving direction of the first welding head 101 relative to the jig 103 is the same as the moving direction of the second welding head 102 relative to the jig 103 , so the welding operation is simple and easy to implement.

[0229] In another embodiment of the present application, in the welding method provided, a moving direction of the third welding head 231 relative to the jig 103 is the same as a moving direction of the fourth welding head 232 relative to the jig 103 .

[0230] The third welding head 231 can move relative to the fixture 103 in the Y direction as shown in FIG13 , and the fourth welding head 232 can move relative to the fixture 103 in the Y direction as shown in FIG13 . In other embodiments, other directions are also possible and are not limited here.

[0231] In the welding method of the embodiment of the present application, the moving direction of the third welding head 231 relative to the jig 103 is the same as the moving direction of the fourth welding head 232 relative to the jig 103 , and the welding operation is simple and easy to implement.

[0232] In another embodiment of the present application, in combination with Figures 10 to 14, a welding method is provided, in which the first welding head 101 welds the first section to be welded 241 along the distribution direction from the first end toward the second end, and the second welding head 102 welds the second section to be welded 242 along the distribution direction from the third end toward the fourth end; the third welding head 231 welds the third section to be welded 243 along the distribution direction from the first end toward the third end, and the fourth welding head 232 welds the fourth section to be welded 244 along the distribution direction from the second end toward the fourth end.

[0233] The first welding head 101 welds the first to-be-welded section 241 along a distribution direction from the first end toward the second end, as shown in FIG11 . The distribution direction from the first end toward the second end can be referred to the direction indicated by the hollow arrow located at the rear and left side in FIG11 .

[0234] The second welding head 102 welds the second to-be-welded section 242 along the distribution direction from the third end to the fourth end; for example, as shown in FIG11 , the distribution direction from the third end to the fourth end can refer to the direction indicated by the hollow arrow located on the front side and to the left in FIG11 .

[0235] The third welding head 231 welds the third to-be-welded section 243 along the distribution direction from the first end toward the third end, as shown in FIG13 . The distribution direction from the first end toward the third end can be referred to the direction indicated by the hollow arrow on the left and rear in FIG13 .

[0236] The fourth welding head 232 welds the fourth to-be-welded section 244 along the distribution direction from the second end toward the fourth end, as shown in FIG13 . The distribution direction along the second end toward the fourth end can be referred to the direction indicated by the hollow arrow on the right and rear side of FIG13 .

[0237] According to the welding method of the embodiment of the present application, during welding, the first welding head 101 is welded from the first end to the second end, the second welding head 102 is welded from the third end to the fourth end, the third welding head 231 is welded from the first end to the third end, and the fourth welding head 232 is welded from the second end to the fourth end, thereby completing the full circle welding of the end cover 22 and the shell 21; in addition, the welding direction of the first welding head 101 is the same as the welding direction of the second welding head 102, and the welding direction of the third welding head 231 is the same as the welding direction of the fourth welding head 232, so the welding operation is simpler and easier to implement.

[0238] However, in actual use of this welding method, the second welding head 102 and the fourth welding head 232 both end welding at the fourth end, which may cause a welding defect of insufficient molten pool at the fourth end.

[0239] In another embodiment of the present application, in combination with FIG. 10 , FIG. 13 and FIG. 14 , the welding method provided is that the second welding head 102 welds the second to-be-welded section 242 along a distribution direction from the third end toward the fourth end and then welds the second to-be-welded section 242 in the reverse direction toward the fourth end;

[0240] And / or, the fourth welding head 232 welds the fourth to-be-welded section 244 along a distribution direction from the second end toward the fourth end and then welds the fourth to-be-welded section 244 in the reverse direction toward the second end.

[0241] In a possible design, the fourth welding head 232 welds the fourth to-be-welded section 244 along a distribution direction from the second end toward the fourth end and then welds the fourth to-be-welded section 244 in the reverse direction toward the second end.

[0242] The distribution direction from the second end toward the fourth end can be referred to as the direction indicated by the hollow arrow located on the right side and closer to the rear in FIG13 , i.e., welding is performed from back to front. The welding direction of the fourth welding head 232 in the opposite direction toward the second end can be referred to as the direction indicated by the hollow arrow located on the right side and closer to the front in FIG13 , i.e., welding is performed from front to back.

[0243] When the fourth welding head 232 is welded from the second end to the fourth end and then welded in the reverse direction toward the second end, the fourth end serves as the welding starting point for the reverse movement of the fourth welding head 232. In this way, the welding material of the reverse welding will accumulate at the fourth end, reducing the risk of insufficient molten pool and improving the welding quality at the fourth end.

[0244] In another embodiment of the present application, in combination with Figures 10, 13 and 14, a welding method is provided, in which a first stop welding position is constructed in the fourth section to be welded 244, and the first stop welding position is located between the second end and the fourth end; when the fourth welding head 232 is welded to the first stop welding position, the fourth welding head 232 is closed; when the fourth welding head 232 decelerates and passes the fourth end, the fourth welding head 232 is opened again and moves in the opposite direction toward the second end and welded to the first stop welding position.

[0245] The first stop welding position refers to the position where the fourth welding head 232 stops welding in the process of welding from the second end to the fourth end. For example, as shown in Figures 13 and 14, the fourth welding head 232 moves from the position indicated by the arrow G along the hollow arrow located on the right and rear side of the figure. When the fourth welding head 232 moves to the end point of the hollow arrow, the welding position of the fourth welding head 232 is the first stop welding position, which can be referred to the position shown by M in Figure 13.

[0246] In the welding method of the embodiment of the present application, when the fourth welding head 232 is welded to the first stop welding position, the fourth welding head 232 is closed; when the fourth welding head 232 decelerates and passes the fourth end, the fourth welding head 232 is opened again and moves in the reverse direction toward the second end and welds to the first stop welding position; after the fourth welding head 232 has not completed welding the fourth section to be welded 244, the welding is stopped in advance, and then the fourth welding head 232 is used to decelerate and move and pass the fourth end, and then move in the reverse direction to weld the unwelded area on the fourth section to be welded 244, thereby completing the welding of the fourth section to be welded 244. and this welding method makes the fourth end serve as the welding starting point for the reverse welding of the fourth welding head 232, so that the welding stop positions of the second welding head 102 and the fourth welding head 232 will not be at the fourth end at the same time, which is beneficial to improving the welding quality at the fourth end; in addition, during this welding process, the fourth welding head 232 stops welding and slows down in advance before welding the fourth section to be welded 244, so that it can prepare for the reverse movement of the fourth welding head 232 and slow down in advance, and can also send a reverse welding command to the fourth welding head 232 in advance, thereby improving welding efficiency.

[0247] In another embodiment of the present application, in combination with FIG. 10 , FIG. 13 and FIG. 14 , a welding method is provided in which the fourth welding head 232 is reversely welded to the first stop welding position and then continues to move toward the second end for welding.

[0248] In the welding method of the embodiment of the present application, after the fourth welding head 232 is reversely welded to the first stop welding position, it continues to move toward the second end for welding, that is, it is welded twice near the first stop welding position to form two welds, and the two welds are stacked near the first stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the fourth section to be welded 244.

[0249] In another embodiment of the present application, in combination with FIG. 10 , FIG. 13 and FIG. 14 , a welding method is provided in which the third welding head 231 moves from the first end to the third end and then moves back toward the first end.

[0250] The direction of movement of the third welding head 231 from the first end to the third end can be seen in the direction indicated by the hollow arrow located on the left and rearward in Figure 11, i.e., from back to front. The direction of movement of the third welding head 231 toward the first end can be seen in the direction indicated by the hollow arrow located on the left and frontward in Figure 11, i.e., from front to back.

[0251] In the welding method of the embodiment of the present application, when the third welding head 231 moves from the first end to the third end and then moves back toward the first end and welds, the welding starting point of the second welding head 102 and the reverse welding starting point of the third welding head 231 intersect at the third end, which is beneficial to improving the welding quality at the third end.

[0252] In another embodiment of the present application, in combination with Figures 10, 13 and 14, a welding method is provided, in which a second stop welding position is constructed in the third section to be welded 243, and the second stop welding position is located at the first end and the third end; when the third welding head 231 is welded to the second stop welding position, the third welding head 231 is closed; when the third welding head 231 passes the third end, the third welding head 231 is opened again and moves in the opposite direction toward the first end and welded to the second stop welding position.

[0253] The second stop welding position refers to the position where the third welding head 231 stops welding during the process of welding from the first end to the third end. For example, as shown in Figures 13 and 14, the third welding head 231 moves from the position indicated by the arrow E along the hollow arrow located on the left and rear of the figure. When the third welding head 231 moves to the end point of the hollow arrow, the welding position of the third welding head 231 is the second stop welding position, which can be referred to the position shown by K in Figure 13.

[0254] In the welding method of the embodiment of the present application, when the third welding head 231 is welded to the second stop welding position, the third welding head 231 is closed; when the fourth welding head 232 decelerates and passes the third end, the third welding head 231 is opened again and moves in the opposite direction toward the first end and welds to the second stop welding position; the third welding head 231 stops welding in advance before completing the welding of the third section to be welded 243, and then uses the third welding head 231 to decelerate and move and pass the third end, and then moves in the opposite direction to weld the unwelded area on the third section to be welded 243, thus completing the welding of the third section to be welded 243; and in this process, the third welding head 231 stops welding and decelerates in advance before completing the welding of the third section to be welded 243, so as to prepare for the reverse movement of the third welding head 231 and decelerate in advance, and also send a reverse welding command to the third welding head 231 in advance, thereby improving welding efficiency.

[0255] In another embodiment of the present application, in combination with FIG. 10 , FIG. 13 and FIG. 14 , a welding method is provided in which the third welding head 231 is reversely welded to the second stop welding position and then continues to move toward the first end for welding.

[0256] In the welding method of the embodiment of the present application, after the third welding head 231 is reversely welded to the second stop welding position, it continues to move toward the first end for welding, that is, it is welded twice near the second stop welding position to form two welds, and the two welds are stacked near the second stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the third section to be welded 243.

[0257] In another possible design, as shown in Figures 10, 11 and 12, the second welding head 102 welds the second section to be welded 242 along the distribution direction from the third end toward the fourth end and then welds the second section to be welded 242 in the opposite direction toward the fourth end.

[0258] The distribution direction from the third end toward the fourth end can be referred to as the direction indicated by the hollow arrow located on the front and left side of Figure 11, that is, welding is performed from left to right. The welding direction of the second welding head 102 toward the third end can be referred to as the direction indicated by the hollow arrow located on the front and right side of Figure 11, that is, welding is performed from right to left.

[0259] When the second welding head 102 is welded from the third end to the fourth end and then welded in the reverse direction toward the third end, the fourth end serves as the welding starting point for the reverse movement of the second welding head 102. In this way, the welding material of the reverse welding will accumulate at the fourth end, reducing the risk of insufficient molten pool and improving the welding quality at the fourth end.

[0260] In another embodiment of the present application, in combination with Figures 10, 11 and 12, a welding method is provided, in which a third stop welding position is constructed in the second section to be welded 242, and the third stop welding position is located between the third end and the fourth end; when the second welding head 102 is welded to the third stop welding position, the second welding head 102 is closed; when the second welding head 102 passes the fourth end, the second welding head 102 is opened again and moves in the opposite direction toward the third end and welded to the third stop welding position.

[0261] The third stop welding position refers to the position where the second welding head 102 stops welding during the process of welding from the third end to the fourth end. For example, as shown in Figures 11 and 12, the second welding head 102 moves from the position indicated by the arrow C along the hollow arrow located in the front and left side of the figure. When the second welding head 102 moves to the end point of the hollow arrow, the welding position of the second welding head 102 is the third stop welding position, which can be referred to the position shown by J in Figure 13.

[0262] In the welding method of the embodiment of the present application, when the second welding head 102 welds to the third stop welding position, the second welding head 102 is closed; when the second welding head 102 decelerates and passes the fourth end, the fourth welding head 232 is opened again and moves in the reverse direction toward the third end and welds to the third stop welding position; after the second welding head 102 has not completed welding the second section to be welded 242, the welding is stopped in advance, and then the second welding head 102 is used to decelerate and move and pass the fourth end, and then move in the reverse direction to weld the unwelded area on the second section to be welded 242, thereby completing the welding of the second section to be welded 242. and this welding method makes the fourth end serve as the welding starting point for the reverse welding of the second welding head 102, so that the welding stop positions of the second welding head 102 and the fourth welding head 232 will not be at the fourth end at the same time, which is beneficial to improving the welding quality at the fourth end; in addition, during this welding process, the second welding head 102 stops welding and slows down in advance before welding the second section to be welded 242. This can prepare for the reverse movement of the second welding head 102 and slow down in advance, and can also send a reverse welding command to the second welding head 102 in advance, thereby improving welding efficiency.

[0263] In another embodiment of the present application, in combination with FIG. 10 , FIG. 11 and FIG. 12 , a welding method is provided in which the second welding head 102 reversely welds to the third stop welding position and then continues to move toward the third end for welding.

[0264] In the welding method of the embodiment of the present application, after the second welding head 102 is reversely welded to the third stop welding position, it continues to move toward the third end for welding, that is, it is welded twice near the third stop welding position to form two welds, and the two welds are stacked near the third stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the second section to be welded 242.

[0265] In another embodiment of the present application, in combination with FIG. 10 , FIG. 11 and FIG. 12 , a welding method is provided in which the first welding head 101 moves from the first end to the second end and then moves back toward the first end.

[0266] The direction of movement of the first welding head 101 from the first end to the second end can be referred to as the direction indicated by the hollow arrow located at the rear and left side in Figure 11, that is, movement from left to right. The direction of movement of the first welding head 101 toward the first end can be referred to as the direction indicated by the hollow arrow located at the rear and right side in Figure 11, that is, movement from right to left.

[0267] In the welding method of the embodiment of the present application, when the first welding head 101 moves from the first end to the second end and then moves back toward the first end to weld, the welding starting point of the fourth welding head 232 and the reverse welding starting point of the first welding head 101 intersect at the second end, thereby facilitating improving the welding quality at the second end.

[0268] In another embodiment of the present application, in combination with Figures 10, 11 and 12, a welding method is provided, in which a fourth stop welding position is constructed in the first section to be welded 241, and the fourth stop welding position is located between the first end and the second end; when the first welding head 101 is welded to the fourth stop welding position, the first welding head 101 is closed; when the first welding head 101 passes the second end, the first welding head 101 is opened again and moves in the opposite direction toward the first end and welds to the fourth stop welding position.

[0269] The fourth stop welding position refers to the position where the first welding head 101 stops welding in the process of welding from the first end to the second end. For example, as shown in Figures 11 and 12, the first welding head 101 moves from the position indicated by arrow A along the hollow arrow located at the rear and left side of the figure, wherein when the first welding head 101 moves to the end point of the hollow arrow, the welding position of the first welding head 101 is the fourth stop welding position, which can be referred to the position shown as I in Figure 11.

[0270] In the welding method of the embodiment of the present application, when the first welding head 101 welds to the fourth stop welding position, the first welding head 101 is closed; when the first welding head 101 decelerates and passes the second end, the first welding head 101 is opened again and moves in the opposite direction toward the first end and welds to the fourth stop welding position; after the first welding head 101 has not completed welding the first section to be welded 241, the welding is stopped in advance, and then, after the first welding head 101 decelerates and moves past the second end, it moves in the opposite direction to weld the unwelded area on the first section to be welded 241, thereby completing the welding of the first section to be welded 241; and in this process, the first welding head 101 stops welding and decelerates in advance before completing welding the first section to be welded 241, so that it can prepare for the reverse movement of the first welding head 101 and decelerate in advance, and it can also send a reverse welding command to the first welding head 101 in advance, thereby improving welding efficiency.

[0271] In another embodiment of the present application, in combination with FIG. 10 , FIG. 11 and FIG. 12 , a welding method is provided in which the first welding head 101 reversely welds to the fourth stop welding position and then continues to move toward the first end for welding.

[0272] In the welding method of the embodiment of the present application, after the first welding head 101 is reversely welded to the fourth stop welding position, it continues to move toward the first end for welding, that is, it is welded twice near the fourth stop welding position to form two welds, and the two welds are stacked near the fourth stop welding position. This can improve the welding quality of the two welds at their connection, which is beneficial to improving the overall welding quality of the first section to be welded 241.

[0273] In another possible design, as shown in Figures 10 to 14 , the second welding head 102 welds the second to-be-welded section 242 along a distribution direction from the third end toward the fourth end and then welds the second to-be-welded section 242 in the reverse direction toward the fourth end;

[0274] The fourth welding head 232 welds the fourth to-be-welded section 244 along a distribution direction from the second end toward the fourth end and then welds the fourth to-be-welded section 244 in the reverse direction toward the second end.

[0275] In the welding method of the embodiment of the present application, the welding material of the reverse welding will be accumulated at the fourth end, reducing the risk of insufficient molten pool and improving the welding quality at the fourth end.

[0276] In another embodiment of the present application, in combination with Figures 5 to 9, the welding method provided is that the welding equipment 200 has a transfer station 2203, the fixture 103 includes a first sub-jig 1031 and a second sub-jig for supporting the shell 21 covered with the end cover 22, and the first sub-jig 1031 is constructed on opposite sides with a first avoidance substructure 10321, and the two first avoidance substructures 10321 are respectively exposed to the first section to be welded 241 and the second section to be welded 242, and the second sub-jig is constructed on opposite sides with a second avoidance substructure, and the two second avoidance substructures are respectively exposed to the third section to be welded 243 and the fourth section to be welded 244; before welding the first section to be welded 241 and the second section to be welded 242, the shell 21 covered with the end cover 22 is placed on the first The sub-jig 1031 is then moved to the first welding station 2201, the first welding head 101 welds the first section to be welded 241 through the corresponding first avoidance substructure 10321, and the second welding head 102 welds the second section to be welded 242 through the corresponding first avoidance substructure 10321; the first sub-jig 1031 is then moved to the transfer station 2203, and the shell 21 covered with the end cover 22 is taken out of the first sub-jig 1031 and placed in the second sub-jig, and the second sub-jig is then moved to the second welding station 2204, the third welding head 231 welds the third section to be welded 243 through the corresponding second avoidance substructure, and the fourth welding head 232 welds the fourth section to be welded 244 through the corresponding second avoidance substructure.

[0277] The first sub-jig 1031 refers to a jig 103 that can load the shell 21 with the end cover 22 and can be used in the first welding station 2201. First space-avoiding sub-structures 10321 are provided on opposite sides of the first sub-jig 1031. The two first space-avoiding sub-structures 10321 are respectively exposed to the first section 241 to be welded and the second section 242 to be welded, so that the first welding head 101 and the second welding head 102 pass through the first space-avoiding sub-structures 10321 to achieve welding of the first section 241 to be welded and the second section 242 to be welded; for example, as shown in Figures 15 and 16, the two first space-avoiding sub-structures 10321 are respectively through holes provided on opposite sides of the first sub-jig 1031; for another example, as shown in Figures 21 to 23, the two first space-avoiding sub-structures 10321 are respectively openings on the left and right sides of the accommodating groove 10312 in the first sub-jig 1031.

[0278] The second sub-jig is a jig 103 that can be loaded with a housing 21 covered with an end cap 22 and used in the second welding station 2204. The second sub-jig is provided with second avoidance substructures on opposite sides of the second sub-jig. The two second avoidance substructures allow the third section 243 to be welded and the fourth section 244 to be welded to be exposed, respectively. This allows the third welding head and the fourth welding head 232 to pass through the second avoidance substructures to weld the third section 243 to be welded and the fourth section 244 to be welded. The structures of the first sub-jig 1031 and the second sub-jig can be identical, but the difference is that when the housing 21 with the end cap 22 is installed in the second sub-jig, the two second avoidance substructures on the second sub-jig allow the third section 243 to be welded and the fourth section 244 to be welded to be exposed. Of course, in other embodiments, the structures of the first sub-jig 1031 and the second sub-jig can also be different. The specific structure can be selected according to actual needs and is not limited here.

[0279] The transfer station 2203 is a position for moving the housing 21 covered with the end cover 22 from the first sub-jig 1031 to the second sub-jig.

[0280] In the actual welding process, the jig 103 needs to completely expose the area to be welded 24 around the end cover 22 and the shell 21, so the jig 103 needs to be divided into two completely disconnected parts. At the same time, the jig 103 must also be able to fix the end cover 22 and the shell 21, which is difficult to achieve using only one jig 103. In the welding method of the embodiment of the present application, the shell 21 covered with the end cover 22 is first installed in the first sub-jig 1031, and the first section to be welded 241 and the second section to be welded 24 are connected. 2 is exposed through the corresponding first avoidance substructure 10321; then, the first sub-jig 1031 is moved to the first welding station 2201, and the first welding head 101 welds the first to-be-welded section 241 through the corresponding first avoidance substructure 10321, and the second welding head 102 welds the second to-be-welded section 242 through the corresponding first avoidance substructure 10321; after completing the welding of the first to-be-welded section 241 and the second to-be-welded section 242, the first sub-jig 103 is moved to the first welding station 2201. 1 is moved to the transfer station 2203, and then the shell 21 of the end cover 22 is moved from the first sub-jig 1031 into the second sub-jig, and the third section to be welded 243 and the fourth section to be welded 244 are exposed through the corresponding second avoidance sub-structure; then, the second sub-jig is moved into the second welding station 2204, and the third welding head 231 and the fourth welding head 232 respectively weld the third section to be welded 243 and the fourth section to be welded 244 through the corresponding second avoidance sub-structure. The full circle welding of the end cover 22 and the shell 21 is completed; and the first sub-jig 1031 and the second sub-jig are used to expose the end cover 22 and the area to be welded 24 of the shell 21 in sections, so that the first sub-jig 1031 and the second sub-jig do not need to be disconnected. The shell 21 covered with the end cover 22 is fixed reliably in the jig 103, which is conducive to improving the welding quality, thereby reducing the welding difficulty between the end cover 22 and the shell 21 and improving the welding effect of the end cover 22 and the shell 21.

[0281] Of course, in other embodiments, the welding equipment 200 may not be provided with the transfer station 2203 , and the jig 103 is a component that can expose the entire area to be welded 24 , which is not limited here.

[0282] In another embodiment of the present application, in conjunction with Figures 5 to 9 , the welding method provided herein, the welding device 200 further comprises a first trimming station 2202;

[0283] After the first sub-jig 1031 moves out of the first welding station 2201 and before moving into the transfer station 2203, the first sub-jig 1031 is moved to the first trimming station 2202 to trim the first weld structure formed in the first section to be welded 241 and the second weld structure formed in the second section to be welded 242.

[0284] The first trimming station 2202 is where the first weld structure formed in the first section to be welded 241 and the second weld structure formed in the second section to be welded 242 are trimmed. It is understood that the welding apparatus 200 includes a first trimming device, which trims the first weld structure formed in the first section to be welded 241 and the second weld structure formed in the second section to be welded 242. The first trimming device can be any commonly available weld trimming device on the market and will not be described in detail here.

[0285] According to the welding method of the embodiment of the present application, after the welding of the first section to be welded 241 and the second section to be welded 242 is completed, a first weld structure is formed in the first section to be welded 241, and a second weld structure is formed in the second section to be welded 242; thereafter, the first sub-jig 1031 is moved to the first trimming station 2202, and then the first weld structure and the second weld structure are trimmed, and the portions of the first weld structure and the second weld structure protruding outside the end cover 22 and the shell 21 are ground off, so that the end cover 22 and the shell 21 have good appearance quality, and the risk of damage to other components can also be reduced.

[0286] In another embodiment of the present application, in combination with Figures 5 to 9, the welding method provided is that the welding equipment 200 further has a second trimming station 2205; after welding the third section to be welded 243 and the fourth section to be welded 244, the second sub-jig is moved to the second trimming station 2205 to trim the third weld structure formed in the third section to be welded 243 and the fourth weld structure formed in the fourth section to be welded 244.

[0287] The second trimming station 2205 is where the third weld structure formed in the third section to be welded 243 and the fourth weld structure formed in the fourth section to be welded 244 are trimmed. It is understood that the welding apparatus 200 includes a second trimming device that trims the third weld structure formed in the third section to be welded 243 and the fourth weld structure formed in the fourth section to be welded 244. The second trimming device can be any commonly available weld trimming device on the market and will not be described in detail here.

[0288] According to the welding method of the embodiment of the present application, after the welding of the third section to be welded 243 and the fourth section to be welded 244 is completed, a third weld structure is formed in the third section to be welded 243, and a fourth weld structure is formed in the fourth section to be welded 244; thereafter, the second sub-jig is moved to the second trimming station 2205, and then the third weld structure and the fourth weld structure are trimmed, and the parts of the third weld structure and the fourth weld structure protruding outside the end cover 22 and the shell 21 are ground off, so that the end cover 22 and the shell 21 have good appearance quality, and the risk of damage to other components can also be reduced.

[0289] In another embodiment of the present application, in combination with Figures 5 to 9, the welding method provided, the welding equipment 200 also includes a conveying device 210, the conveying device 210 can convey the first sub-jig 1031 to the first welding station 2201, the first trimming station 2202, and the transfer station 2203, and the conveying device 210 can also convey the second sub-jig to the transfer station 2203, the second welding station 2204 and the second trimming station 2205.

[0290] The welding method of the embodiment of the present application utilizes the conveying device 210 to convey the first sub-jig 1031 and the second sub-jig, which can realize mechanized operation, thereby improving welding efficiency and improving welding quality.

[0291] In another embodiment of the present application, in combination with Figures 5 to 9, the welding method provided is that before the shell 21 covered with the end cover 22 is placed in the jig 103, the end cover 22 is covered on the shell 21 and the end cover 22 is located below the shell 21, and then placed in the jig 103.

[0292] After the end cover 22 is covered on the shell 21 and the end cover 22 is located below the shell 21, it can be understood that, referring to Figures 21 to 23, when the shell 21 covered with the end cover 22 is placed in the jig 103, the shell 21 is upside down on the end cover 22, that is, the end cover 22 is located below the shell 21. On the one hand, the shell 21 will be stably and reliably upside down on the end cover 22 under its own gravity, thereby improving the stability of the connection between the end cover 22 and the shell 21 and improving the subsequent welding accuracy; on the other hand, during welding, it can also reduce the risk of dust entering the shell 21.

[0293] In one embodiment, as shown in Figure 5, the welding equipment 200 has a conveying device 210, which is arranged in an inverted L shape. The conveying device 210 in the horizontal conveying part is distributed with an assembly station 2206, a first welding station 2201, a first trimming station 2202 and a transfer station 2203 in sequence along the horizontal conveying direction, and the conveying device 210 in the vertical conveying part is distributed with a transfer station 2203, a second welding station 2204 and a second trimming station 2205 in sequence along the vertical conveying direction.

[0294] First, as shown in FIG. 5 , at the assembly station 2206 , the housing 21 is flipped upside down on the end cover 22 , and then the housing 21 covered with the end cover 22 is placed in the first sub-jig 1031 ;

[0295] Afterwards, as shown in Figures 5, 6 and 7, the conveying device 210 conveys the first sub-jig 1031 to the first welding station 2201, and the first welding head 101 is turned on and moves from position A to position B, that is, from left to right. When the first welding head 101 moves L1, that is, before the first welding head 101 starts welding the first section to be welded 241, the first welding head 101 reaches the preset welding speed of the first welding head 101, the first welding head 101 continues to move and maintains the preset welding speed to weld the first section to be welded 241. When the welding of the first section to be welded 241 is completed, the first welding head 101 begins to decelerate and gradually closes until it moves to position B and completely stops moving and closes, so that the acceleration and deceleration sections of the first welding head 101 are all located outside the first section to be welded 241, thereby reducing the impact of unstable acceleration and deceleration speeds on welding quality, which is conducive to improving welding quality.

[0296] At the same time, the second welding head 102 is turned on and moves from position C to position D, that is, from right to left. When the second welding head 102 moves L3, that is, before the second welding head 102 starts to weld the second section to be welded 242, the second welding head 102 reaches the preset welding speed of the second welding head 102, the second welding head 102 continues to move and maintains the preset welding speed of the second welding head 102 to weld the second section to be welded 242. When the welding of the second section to be welded 242 is completed, the second welding head 102 begins to decelerate and close until it moves to position D and completely stops moving and closes, so that the acceleration and deceleration sections of the second welding head 102 are all located outside the second section to be welded 242, thereby reducing the impact of unstable acceleration and deceleration speeds on welding quality, which is beneficial to improving welding quality.

[0297] 5 , the conveying device 210 moves the first sub-jig 1031 to the first trimming station 2202 to trim the first weld structure formed in the first section to be welded 241 and the second weld structure formed in the second section to be welded 242 .

[0298] 5 , the conveying device 210 moves the first sub-jig 1031 to the transfer station 2203 , and then moves the housing 21 with the end cap 22 inside the first sub-jig 1031 into the second sub-jig.

[0299] Then, in combination with Figures 5, 8 and 9, the conveying device 210 moves the second sub-jig to the second welding station 2204, the third welding head 231 is turned on and moves from position E toward position F, that is, from front to back, when the third welding head 231 moves L5, that is, before the third welding head 231 starts welding the third section to be welded 243, the third welding head 231 reaches the preset welding speed of the third welding head 231, the third welding head 231 continues to move and maintains the preset welding speed to weld the third section to be welded 243, when the welding of the third section to be welded 243 is completed, the third welding head 231 starts to decelerate and close until it moves to the F position and completely stops moving and closes, so that the acceleration and deceleration sections of the third welding head 231 are all located outside the welding of the third section to be welded 243, thereby reducing the impact of unstable acceleration and deceleration speeds on welding quality, which is conducive to improving welding quality.

[0300] At the same time, the fourth welding head 232 opens and moves from the G position to the H position, that is, moves from back to front. When the fourth welding head 232 moves L7, that is, before the fourth welding head 232 starts to weld the fourth section to be welded 244, the fourth welding head 232 reaches the preset welding speed of the fourth welding head 232, and the fourth welding head 232 continues to move and maintains the preset welding speed of the fourth welding head 232 to weld the fourth section to be welded 244. When the welding of the fourth section to be welded 244 is completed, the fourth welding head 232 begins to decelerate and close until it moves to the D position and completely stops moving and closes, so that the acceleration and deceleration sections of the fourth welding head 232 are all located outside the fourth section to be welded 244, thereby reducing the impact of unstable acceleration and deceleration speeds on welding quality, which is beneficial to improving welding quality.

[0301] Finally, as shown in FIG5 , the conveying device 210 moves the second sub-jig to the second trimming station 2205 to trim the third weld structure formed in the third section to be welded 243 and the fourth weld structure formed in the fourth section to be welded 244 .

[0302] During this welding process, the first welding head 101 welds from left to right, the second welding head 102 welds from right to left, the third welding head 231 welds from front to back, and the fourth welding head 232 welds from back to front, so that the welding starting point and welding stop position of the welding head will not be at the same position, thereby reducing the risk of welding defects and improving welding quality.

[0303] In one embodiment, as shown in Figure 10, the welding equipment 200 has a conveying device 210, which is arranged in an inverted L shape. The conveying device 210 in the horizontal conveying part is sequentially distributed with an assembly station 2206, a first welding station 2201, a first trimming station 2202 and a transfer station 2203 along the horizontal conveying direction, and the conveying device 210 in the vertical conveying part is sequentially distributed with a transfer station 2203, a second welding station 2204 and a second trimming station 2205 along the vertical conveying direction.

[0304] First, as shown in FIG. 10 , at the assembly station 2206 , the housing 21 is flipped upside down on the end cover 22 , and then the housing 21 covered with the end cover 22 is placed in the first sub-jig 1031 ;

[0305] Afterwards, as shown in Figures 10, 11 and 12, the conveying device 210 conveys the first sub-jig 1031 to the first welding station 2201, and the first welding head 101 is turned on and moves from position A to position B, that is, from left to right. When the first welding head 101 moves L1, that is, before the first welding head 101 starts to weld the first section to be welded 241, the first welding head 101 reaches the preset welding speed of the first welding head 101, the first welding head 101 continues to move and maintains the preset welding speed to weld the first section to be welded 241. When the first welding head 101 moves L1, that is, before the first welding head 101 starts to weld the first section to be welded 241, the first welding head 101 continues to move and maintains the preset welding speed to weld the first section to be welded 241. When welding to position I, the first welding head 101 is closed and moves at a reduced speed. After the first welding head 101 moves to position B, the first welding head 101 is opened and begins to move in the opposite direction toward position A, i.e., from right to left. When the first welding head 101 moves L2, i.e., before the first welding head 101 welds the first section to be welded 241 again, the first welding head 101 reaches the preset welding speed of the first welding head 101, and the first welding head 101 continues to move in the opposite direction and maintains the preset welding speed to weld the first section to be welded 241. When the first welding head 101 welds to position I, the first welding head 101 begins to decelerate and moves a certain distance before closing, thus completing the welding of the first section to be welded 241. It should be noted that in order to clearly illustrate the movement direction of the first welding head 101, the rear side is indicated by two hollow arrows staggered left and right in FIG. 11. However, in the actual welding process, the distance between the first welding head 101 and the rear side of the end cap 22 can remain unchanged or vary, depending on actual needs and is not limited here.

[0306] At the same time, the second welding head 102 is turned on and moves from position C to position D, that is, moves from left to right. When the second welding head 102 moves L3, that is, before the second welding head 102 starts to weld the second section to be welded 242, after the second welding head 102 reaches the preset welding speed of the second welding head 102, the second welding head 102 continues to move and maintains the preset welding speed of the second welding head 102 to weld the second section to be welded 242. When the second welding head 102 welds to position J, the second welding head 102 is turned off and starts to decelerate. When the second welding head 102 moves to position D, The second welding head 102 is opened and moves in the opposite direction toward position C, that is, from right to left; when the second welding head 102 moves L4, that is, before the second welding head 102 welds the second section to be welded 242, after the second welding head 102 reaches the preset welding speed of the second welding head 102, the second welding head 102 continues to move and maintains the preset welding speed of the second welding head 102 to weld the second section to be welded 242. When the second welding head 102 is welded to position J, the second welding head 102 begins to decelerate and moves a distance before closing, thus achieving the welding of the second section to be welded 242. It should be noted that in order to clearly show the moving direction of the first welding head 101, the front side of Figure 11 is represented by two hollow arrows staggered left and right. In the actual welding process, the distance between the second welding head 102 and the front side of the end cover 22 can remain unchanged or vary according to actual needs, which is not limited here.

[0307] 10 , the conveying device 210 moves the first sub-jig 1031 to the first trimming station 2202 to trim the first weld structure formed in the first section to be welded 241 and the second weld structure formed in the second section to be welded 242 .

[0308] 10 , the conveying device 210 moves the first sub-jig 1031 to the transfer station 2203 , and then moves the housing 21 with the end cap 22 inside the first sub-jig 1031 into the second sub-jig.

[0309] Then, in combination with Figures 10, 11 and 12, the conveying device 210 moves the second sub-jig to the second welding station 2204, the third welding head 231 is turned on and moves from position E toward position F, that is, from back to front, when the third welding head 231 moves L5, that is, before the third welding head 231 starts to weld the third section to be welded 243, after the third welding head 231 reaches the preset welding speed of the third welding head 231, the third welding head 231 continues to move and maintains the preset welding speed to weld the third section to be welded 243; when the third welding head 231 is welded to position K, the third welding head 231 is closed. After the third welding head 231 moves L6, that is, before the third welding head 231 reversely welds the third section to be welded 243, the third welding head 231 reaches the preset welding speed of the third welding head 231, and the third welding head 231 continues to move and maintains the preset welding speed to weld the third section to be welded 243; when the third welding head 231 welds to position K, the third welding head 231 starts to decelerate and moves a distance before closing, thus completing the welding of the third section to be welded 243. It should be noted that in order to clearly show the movement direction of the third welding head 231, two hollow arrows staggered left and right are used on the left side of Figure 13. In the actual welding process, the distance between the third welding head 231 and the left side of the end cover 22 can remain unchanged or vary according to actual needs and is not limited here.

[0310] At the same time, the fourth welding head 232 is turned on and moves from the G position to the H position, that is, moves from back to front. When the fourth welding head 232 moves L7, that is, before the fourth welding head 232 starts to weld the fourth section to be welded 244, after the fourth welding head 232 reaches the preset welding speed of the fourth welding head 232, the fourth welding head 232 continues to move and maintains the preset welding speed of the fourth welding head 232 to weld the fourth section to be welded 244; when the fourth welding head 232 welds to the M position, the fourth welding head 232 is closed and starts to decelerate. After moving to the H position, the fourth The welding head 232 is opened and moves in the opposite direction toward the G position. When the fourth welding head 232 moves L8, that is, before the fourth welding head 232 starts to weld the fourth section to be welded 244, the fourth welding head 232 reaches the preset welding speed of the fourth welding head 232, and the fourth welding head 232 continues to move and maintains the preset welding speed of the fourth welding head 232 to weld the fourth section to be welded 244; when the fourth welding head 232 welds to the M position, the fourth welding head 232 starts to decelerate and moves a distance before closing, thus completing the welding of the fourth section to be welded 244. It should be noted that in order to clearly show the movement direction of the fourth welding head 232, two hollow arrows staggered left and right are used on the right side of Figure 13. In the actual welding process, the distance between the fourth welding head 232 and the left side of the end cover 22 can remain unchanged or vary according to actual needs and is not limited here.

[0311] Finally, as shown in FIG10 , the conveying device 210 moves the second sub-jig to the second trimming station 2205 to trim the third weld structure formed in the third section to be welded 243 and the fourth weld structure formed in the fourth section to be welded 244 .

[0312] During this welding process, the moving direction of the first welding head 101 is the same as the moving direction of the second welding head 102, and the moving direction of the third welding head 231 is the same as the moving direction of the fourth welding head 232. The welding operation is simple and easy to implement. In addition, the weld structure obtained by welding intersects at the corners of the end cover 22 where the welding starting points intersect. The welding quality of the end cover 22 and the shell 21 at the corners of the end cover 22 is good, which is beneficial to improving the sealing performance of the end cover 22 and the shell 21.

[0313] In another embodiment of the present application, in combination with Figures 15 and 16, a welding device 100 is provided, which includes a first welding head 101, a second welding head 102 and a jig 103, the jig 103 is used to support the shell 21 with the end cover 22, and the jig 103 is constructed with an avoidance structure for exposing the area to be welded 24 between the end cover 22 and the shell 21; a welding station 1001 is formed between the first welding head 101 and the second welding head 102; wherein, when the jig 103 is located at the welding station 1001, the first welding head 101 and the second welding head 102 weld the area to be welded 24 to the to-be-welded sections 240 located on opposite sides of the end cover 22 through the avoidance structure 1032.

[0314] Welding station 1001 is located between first welding head 101 and second welding head 102. After jig 103 moves to welding station 1001, first welding head 101 and second welding head 102 can weld the corresponding section to be welded 240. Welding station 1001 can be first welding station 2201 or second welding station 2204, depending on the position of welding device 100 within welding equipment 200, and is not limited herein.

[0315] The section to be welded 240 refers to the section of the section to be welded 24 located on one side of the end cap 22. For example, as shown in FIG7 , the section to be welded 240 may refer to the section of the section to be welded 24 located on the rear long side of the end cap 22, i.e., the first section to be welded 241; or it may refer to the section of the section to be welded 24 located on the front long side of the end cap 22. That is, the second section to be welded 242; it can also refer to the area section in the area to be welded 24 located at the short side of the left side of the end cover 44, that is, the third section to be welded 243; it can also refer to the area section in the area to be welded 24 located at the short side of the right side of the end cover 22, that is, the fourth section to be welded 244; it should be noted here that the first welding head 101 welds the area section located at the long side of the rear side of the end cover 22, that is, the first section to be welded 241; the second welding head 102 welds the area section located at the long side of the front side of the end cover 22, that is, the second section to be welded 242; of course, in other embodiments, the first welding head 101 welds the area section located at the short side of the left side of the end cover 22, that is, the third section to be welded 243; the second welding head 102 welds the area section located at the short side of the right side of the end cover 22, that is, the fourth section to be welded 244.

[0316] In the welding device 100 of the embodiment of the present application, when welding, the shell 21 covered with the end cover 22 is first fixed in the jig 103. At this time, the first welding head 101 and the second welding head 102 are respectively located on the opposite sides of the shell 21 covered with the end cover 22. Afterwards, the first welding head 101 and the second welding head 102 respectively weld the sections to be welded 240 on the opposite sides of the shell 21 covered with the end cover 22. In this way, the opposite sides of the shell 21 covered with the end cover 22 are welded simultaneously, thereby improving the welding efficiency.

[0317] In one embodiment, as shown in Figures 15 and 16, the welding device 100 further includes a first driving member 108 and a second driving member 109. The second driving member 109 is connected to the first driving member 108, and the first driving member 108 moves with the first welding head 101. The first driving member 108 is used to drive the first welding head 101 to move up and down to accommodate the welding requirements of the sections to be welded 240 at different heights on the end cap 22 and the shell 21; the second driving member 109 is used to drive the first driving member 108 and the first welding head 101 to move forward and backward to adjust the distance between the first welding head 101 and the section to be welded 240 on the rear side of the shell 21 to accommodate the welding requirements of end caps 22 and shells 21 of different sizes or different welding requirements, thereby improving the applicability of the welding device 100. The first driving member 108 and the second driving member 109 can be, but are not limited to, components such as cylinders and linear modules that can drive the movement of the first welding head 101.

[0318] In another embodiment, the welding device 100 further includes a third driving member 110 and a fourth driving member 111, wherein the third driving member 110 is connected to the fourth driving member 111, and the third driving member 110 moves with the second welding head 102. The third driving member 110 is used to drive the second welding head 102 to move up and down to meet the welding requirements of the sections to be welded 240 at different heights on the end cap 22 and the shell 21. In addition, the fourth driving member 111 is used to drive the third driving member 110 and the second welding head 102 to move forward and backward to adjust the distance between the second welding head 102 and the sections to be welded 240 on the front side of the end cap 22 and the shell 21 to meet the welding requirements of end caps 22 and shells 21 of different sizes or different welding requirements, thereby improving the applicability of the welding device 100. The third driving member 110 and the fourth driving member 111 can be, but are not limited to, components such as cylinders and linear modules that can drive the second welding head 102 to move.

[0319] In another embodiment of the present application, in combination with Figures 17 and 18, the provided welding device 100 also includes a first moving member 104, which is connected to the first welding head 101 and is used to drive the first welding head 101 to move relative to the jig 103, so that the first welding head 101 welds the corresponding section 240 to be welded; the welding device 100 also includes a second moving member 105, which is connected to the second welding head 102 and is used to drive the second welding head 102 to move relative to the jig 103, so that the second welding head 102 welds the corresponding section 240 to be welded.

[0320] The first moving member 104 is a power component capable of driving the first welding head 101 to move. For example, as shown in Figures 7, 17, and 18, the first moving member 104 drives the first welding head 101 to move left and right, so that the first welding head 101 moves along the extension direction of the long side of the rear side of the end cover 22, thereby welding the long side of the rear side of the end cover 22 to the long side of the rear side of the opening of the housing 21. For example, the first moving member 104 can be a component capable of driving the first welding head 101 to move, such as a cylinder or a linear module.

[0321] The second moving member 105 is a power component capable of driving the second welding head 102 to move. For example, as shown in Figures 7, 17, and 18, the second moving member 105 drives the second welding head 102 to move back and forth, so that the second welding head 102 moves along the extension direction of the long side of the front side of the end cover 22, thereby welding the long side of the front side of the end cover 22 to the long side of the front side of the opening of the housing 21. For example, the second moving member 105 can be a component capable of driving the second welding head 102 to move, such as a cylinder or a linear module.

[0322] In the welding device 100 of the embodiment of the present application, during welding, the first movable member 104 drives the first welding head 101 to move, and at the same time, the second movable member 105 drives the second welding head 102 to move, so that the first welding head 101 and the second welding head 102 move simultaneously relative to the jig 103, thereby simultaneously completing the welding of the to-be-welded sections 240 on the opposite sides of the end cover 22 and the shell 21, thereby improving the welding efficiency; in addition, the first movable member 104 and the second movable member 105 respectively drive the first welding head 101 and the second welding head 102 to move, and the overall structure of the welding device 100 is simple, which is convenient for processing and manufacturing.

[0323] In another embodiment of the present application, as shown in FIG. 17 and FIG. 18 , the provided welding device 100 further includes a clamping mechanism 106 . The clamping mechanism 106 is located at the welding station 1001 and is used to clamp and fix the housing 21 .

[0324] The clamping mechanism 106 refers to a mechanism capable of clamping and fixing the housing 21 , wherein the clamping mechanism 106 may be a clamping claw, a finger cylinder, or the like capable of clamping a component.

[0325] In the welding device 100 of the embodiment of the present application, when the jig 103 is located between the first welding head 101 and the second welding head 102, the clamping mechanism 106 can be clamped outside the shell 21 and can fix the shell 21 to achieve the positioning of the shell 21, so that the first welding head 101 and the second welding head 102 can accurately weld the corresponding sections to be welded 240, thereby improving the welding accuracy.

[0326] In another embodiment of the present application, in combination with Figures 17 and 18, the clamping mechanism 106 provided includes a fixed plate 1061 and a first side plate 1062 and a second side plate 1063 connected to the fixed plate 1061. The first side plate 1062, the second side plate 1063 and the fixed plate 1061 are jointly arranged to form a clamping groove 1064, which is used to clamp the shell 21.

[0327] The fixing plate 1061 serves as a mounting base for the first side plate 1062 and the second side plate 1063 , and plays a role in supporting and fixing the first side plate 1062 and the second side plate 1063 .

[0328] The first side plate 1062 refers to a plate connected to one side of the fixed plate 1061 ; for example, as shown in FIG7 and FIG8 , the fixed plate 1061 refers to a horizontally placed plate, and the first side plate 1062 refers to a plate connected to the rear side of the fixed plate 1061 .

[0329] The second side plate 1063 refers to a plate connected to the other side of the fixing plate 1061 ; for example, as shown in FIG. 7 and FIG. 8 , the second side plate 1063 refers to a plate connected to the front side of the fixing plate 1061 .

[0330] The clamping groove 1064 refers to a groove structure formed by the fixed plate 1061, the first side plate 1062 and the second side plate 1063. The groove structure is used to accommodate the shell 21 covered with the end cover 22, and when the shell 21 is accommodated in the clamping groove 1064, the shell 21 covered with the end cover 22 is positioned and in a stationary state, so that the first welding head 101 and the second welding head 102 can accurately weld the corresponding area to be welded 24, thereby improving the welding accuracy.

[0331] In the welding device 100 according to the embodiment of the present application, the clamping mechanism 106 adopts a structure of a fixed plate 1061 , a first side plate 1062 , and a second side plate 1063 . The structure is simple, and the welding device 100 is easy to manufacture and process.

[0332] In another embodiment, the connection between the first side plate 1062 and the fixing plate 1061 and the connection between the second side plate 1063 and the fixing plate 1061 may be, but is not limited to, bolt connection, bonding, clamping, riveting, welding, or one-piece molding. One-piece molding refers to molding by an one-piece process such as extrusion, injection molding, or die casting.

[0333] In another embodiment, the first side plate 1062 and the fixed plate 1061 can be movably connected so that the distance between the first side plate 1062 and the second side plate 1063 can be adjusted, so that shells 21 of different sizes can be clamped to expand the scope of application of the welding device 100; for example, the first side plate 1062 and the fixed plate 1061 can be connected by a driving member such as a cylinder, a linear module, etc. that can drive the first side plate 1062 to move.

[0334] In another embodiment, the second side plate 1063 and the fixed plate 1061 can be movably connected so that the distance between the first side plate 1062 and the second side plate 1063 can be adjusted, so that shells 21 of different sizes can be clamped to expand the scope of application of the welding device 100; for example, the second side plate 1063 and the fixed plate 1061 can be connected by a driving member such as a cylinder, a linear module, etc. that can drive the second side plate 1063 to move.

[0335] In another embodiment, as shown in Figures 17 and 18 , the number of first side plates 1062 can be one or more. For example, there are two first side plates 1062, with the two first side plates 1062 arranged front to back. This provides more contact points between the housing 21 and the clamping mechanism 106, and provides more stable and reliable clamping of the housing 21. In other embodiments, the number of first side plates 1062 can be three, four, or five or more. The specific number can be set based on actual needs and is not limited here.

[0336] In another embodiment, the number of second side plates 1063 may be one or more. For example, there are two second side plates 1063, with the two second side plates 1063 distributed front to back. This increases the number of contact points between the housing 21 and the clamping mechanism 106, and improves the stability and reliability of the clamping of the housing 21. In other embodiments, the number of second side plates 1063 may be three, four, or five or more. The specific number can be set according to actual needs and is not limited here.

[0337] In another embodiment of the present application, as shown in Figures 17 and 18, the first side plate 1062 of the welding device 100 is located between the first welding head 101 and the jig 103, and the second side plate 1063 is located between the second welding head 102 and the jig 103.

[0338] The first side plate 1062 is located between the first welding mechanism and the jig 103 . For example, as shown in FIG. 17 and FIG. 18 , the first side plate 1062 is located on the rear side of the housing 21 .

[0339] The second side plate 1063 is located between the second welding mechanism and the jig 103 . For example, as shown in FIG. 17 and FIG. 18 , the second side plate 1063 is located on the front side of the housing 21 .

[0340] In the welding device 100 of the embodiment of the present application, the first side plate 1062 is located between the first welding head 101 and the jig 103, and the second side plate 1063 is located between the second welding head 102 and the jig 103. In this way, the first side plate 1062 and the second side plate 1063 can achieve the front and rear positioning of the shell 21, so that the spacing between the first welding head 101 and the second welding head 102 and the corresponding section to be welded 240 is within a suitable range, and the welding quality is good. In addition, please refer to Figures 21 to 23. The jig 103 can achieve the front and rear positioning of the shell 21, and the clamping mechanism 106 can achieve the left and right positioning of the shell 21. In this way, the shell 21 is positioned on all sides, the positioning accuracy of the shell 21 is better, and the welding quality is higher.

[0341] In another embodiment of the present application, in combination with Figures 19 and 20, the provided welding device 100 also includes a moving mechanism 107, which is used to drive the jig 103 to move so that the first welding head 101 welds the corresponding section 240 to be welded, and the second welding head 102 welds the corresponding section 240 to be welded.

[0342] The moving mechanism 107 refers to a component that can drive the jig 103 to move. During the movement of the jig 103, the housing 21 also moves accordingly. At the same time, the first welding head 101 and the second welding head 102 are in a stationary state. During the process of the jig 103 driving the housing 21 to move, the welding positions of the first welding head 101 and the second welding head 102 on the housing 21 change, thereby achieving welding of the section to be welded 240. For example, as shown in Figures 9 and 10, the moving mechanism 107 can drive the housing 21 covered with the end cover 22 to move left and right, so that the first welding head 101 and the second welding head 102 respectively weld the long sides of the front and rear sides of the end cover 22, thereby welding the long sides of the left and right sides of the end cover 22 to the long sides corresponding to the opening of the housing 21, thereby achieving welding of the long sides of the end cover 22. For example, the moving mechanism 107 can be a component that can drive the movement of the jig 103, such as a cylinder or a linear module.

[0343] In the welding device 100 of the embodiment of the present application, the first welding head 101 and the second welding head 102 are stationary, while the jig 103 moves. Therefore, during the actual welding process, the jig 103 does not need to stop and can directly pass between the first welding head 101 and the second welding head 102 to achieve welding, which can greatly improve the welding efficiency; in addition, during the welding process, the first welding head 101 and the second welding head 102 are relatively stationary and do not need to move, which is also conducive to improving the accuracy of the welding position and improving the welding precision.

[0344] In another embodiment of the present application, in combination with Figures 19 and 20, the moving mechanism 107 of the welding device 100 provided includes a first conveyor belt assembly 1071 and a second conveyor belt assembly 1072 arranged at intervals. The first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 can clamp the shell 21 and enable the shell 21 to move under the conveyance of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072.

[0345] The first conveyor belt assembly 1071 refers to a conveyor belt assembly for conveying the housing 21. For example, as shown in Figures 19 and 20, the first conveyor belt assembly 1071 refers to a conveyor belt assembly located on the rear side of the fixture 103. The first conveyor belt assembly 1071 includes a driving member, a transmission member, and a conveyor belt. The conveyor belt is sleeved outside the transmission member. The driving member drives the transmission member to rotate, thereby driving the conveyor belt to move, thereby driving the housing 21 located between the first conveyor belt and the second conveyor belt to move. The transmission member can be a conveyor roller, a conveyor wheel, or other components, the driving member can be a motor, or other components, and the conveyor belt can be a conveyor crawler, a conveyor timing belt, or the like.

[0346] The second conveyor belt assembly 1072 refers to a conveyor belt assembly for conveying the shell 21. For example, as shown in Figures 19 and 20, the second conveyor belt assembly 1072 refers to the conveyor belt assembly located in front of the fixture 103, wherein the structure of the second conveyor belt assembly 1072 may be the same as that of the first conveyor belt assembly. Its specific structure refers to the structure of the above-mentioned first conveyor belt assembly 1071. Of course, in other embodiments, the structure of the second conveyor belt assembly 1072 may be different from that of the first conveyor belt assembly 1071, which is not limited here.

[0347] The first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 can clamp the shell 21 and enable the shell 21 to move under the conveyance of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072. It can be understood that when the jig 103 is loaded and moved between the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 can clamp the shell 21, and under the conveyance of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, the shell 21 will move left and right accordingly, thereby realizing the welding of the section 240 to be welded.

[0348] In the welding device 100 of the embodiment of the present application, during welding, the jig 103 moves between the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, and the housing 21 in the jig 103 is moved under the conveyance of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, thereby achieving welding of the section to be welded 240. The first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 clamp the housing 21, which also plays a positioning role for the housing 21, which is conducive to improving the welding accuracy. In addition, the structure of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 is used to convey the housing 21, and the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072 are in contact and positioned with the two opposite sides of the housing 21, which has better positioning accuracy and better welding accuracy.

[0349] In another embodiment of the present application, in combination with Figures 21 to 23, the jig 103 of the provided welding device 100 is constructed with a clamping plate 10311 and a receiving groove 10312 for accommodating the shell 21 covered with the end cover 22. The clamping plate 10311 is located at the opening of the receiving groove 10312, and is pressed on the shell 21 and pushes the shell 21 toward the end cover 22 to compress and fix the end cover 22 and the shell 21.

[0350] In the actual welding process, the shell 21 and the end cover 22 are easy to move relative to each other during the movement, which leads to problems such as the welding position being offset and poor welding accuracy. In order to solve this problem, pre-welding is usually adopted, that is, before the shell 21 covered with the end cover 22 is moved to the welding position, the end cover 22 and the shell 21 are preliminarily welded together, so that the end cover 22 and the shell 21 are relatively fixed and will not move, thereby improving the accuracy of subsequent welding. However, pre-welding will increase the welding process and reduce welding efficiency.

[0351] The fixture 103 is constructed with a pressing plate 10311 and a receiving groove 10312 for receiving the housing 21 covered with the end cover 22 . The receiving groove 10312 provides an installation space for the housing 21 covered with the end cover 22 .

[0352] The pressing plate 10311 is located at the opening of the accommodating groove 10312, and is pressed against the shell 21 and pushes the shell 21 toward the end cover 22 to press and fix the end cover 22 and the shell 21; it can be understood that the pressing plate 10311 is located at the opening of the accommodating groove 10312, and the end cover 22 is located at the bottom of the accommodating groove 10312. The pressing plate 10311 pushes the shell 21 toward the bottom of the accommodating groove 10312, so that the shell 21 and the end cover 22 are pressed and fixed together. At this time, the end cover 22 and the shell 21 can be stably fixed together, thereby eliminating the pre-welding operation and improving welding efficiency; and, under the pressing action of the clamping plate 10311, the shell 21 and the end cover 22 will not move relative to each other during the welding movement, so that the shell 21 and the end cover 22 can be accurately welded together with high welding accuracy; in addition, the shell 21 is inverted on the end cover 22, and the opening of the shell 21 is set downward, so that foreign matter such as dust and welding slag will not fall into the shell 21.

[0353] In one embodiment, the clamping plate 10311 and the fixture 103 can be connected by, but not limited to, screw connection, clamping connection, rotation connection, etc.; in another embodiment, the clamping plate 10311 and the fixture 103 are an integrated structure.

[0354] In one embodiment, in combination with Figures 15 and 16, the jig 103 accommodates a shell 21 covered with an end cover 22, the first welding head 101, the first driving member 108 and the second driving member 109 are all located on the rear side of the shell 21, and the second welding head 102, the third driving member 110 and the fourth driving member 111 are all located on the front side of the shell 21, so that the layout is convenient for component arrangement; the first driving member 108 is installed on the second driving member 109, and the first welding head 101 is installed on the first driving member 108, the first driving member 108 drives the first welding head 101 to move up and down, and the second driving member 109 drives the first welding head 101 to move forward and backward; the third driving member 110 is installed on the fourth driving member 111, and the second welding head 102 is installed on the third driving member 110, the third driving member 110 drives the second welding head 102 to move up and down, and the fourth driving member 111 drives the second welding head 102 to move forward and backward. In addition, the jig 103 can be driven to move by the conveying device 210, so that the first welding head 101 and the second welding head 102 can move relative to the jig 103, thereby achieving welding of the corresponding sections to be welded 240. This has a simple structure and is convenient for processing and manufacturing.

[0355] In one embodiment, in combination with Figures 17 and 18, the jig 103 contains a housing 21 covered with an end cover 22, the clamping mechanism 106 clamps the outside of the housing 21, the first welding head 101, the first driving member 108, the second driving member 109 and the first moving member 104 are all located on the rear side of the housing 21, the second moving member 105, the second welding head 102, the third driving member 110 and the fourth driving member 111 are all located on the front side of the housing 21, so that the layout is convenient for component arrangement; the second driving member 109 is mounted on the first moving member 104, the first driving member 108 is mounted on the second driving member 109, the first welding head 101 is mounted on the first driving member 108, and the first driving member 105 is mounted on the first driving member 109. 8 drives the first welding head 101 to move up and down, the second driving member 109 drives the first welding head 101 to move forward and backward, and the first moving member 104 drives the first welding head 101 to move left and right, thereby realizing the welding of the corresponding section to be welded 240; the fourth driving member 111 is installed on the second moving member 105, the third driving member 110 is installed on the fourth driving member 111, and the second welding head 102 is installed on the third driving member 110. The third driving member 110 drives the second welding head 102 to move up and down, the fourth driving member 111 drives the second welding head 102 to move forward and backward, and the second moving member 105 drives the second welding head 102 to move left and right, thereby realizing the welding of the corresponding section to be welded 240.

[0356] In one embodiment, in combination with Figures 19 and 20, the jig 103 contains a shell 21 covered with an end cover 22, the shell 21 is clamped by the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, the first welding head 101, the first driving member 108, the second driving member 109 and the first conveyor belt assembly 1071 are all located on the rear side of the shell 21, and the first conveyor belt assembly 1071 is located between the jig 103 and the first driving member 108; the second conveyor belt assembly 1072, the second welding head 102, the third driving member 110 and the fourth driving member 111 are all located on the front side of the shell 21, and the second conveyor belt assembly 1072 is located between the jig 103 and the third driving member 110, so that the layout is convenient for component arrangement; the second driving member 109 is installed on the first moving member 10 4, the first driving member 108 is installed on the second driving member 109, and the first welding head 101 is installed on the first driving member 108. The first driving member 108 drives the first welding head 101 to move up and down, and the second driving member 109 drives the first welding head 101 to move forward and backward; the fourth driving member 111 is installed on the second moving member 105, and the third driving member 110 is installed on the fourth driving member 111. The second welding head 102 is installed on the third driving member 110. The third driving member 110 drives the second welding head 102 to move up and down, and the fourth driving member 111 drives the second welding head 102 to move forward and backward; in addition, under the transportation of the first conveyor belt assembly 1071 and the second conveyor belt assembly 1072, the shell 21 moves left and right accordingly, thereby realizing the welding of the corresponding section 240 to be welded.

[0357] As shown in FIG. 5 to FIG. 14 , in one embodiment of the present application, a welding device 200 is provided, comprising the welding apparatus 100 described above.

[0358] The welding equipment 200 of the embodiment of the present application adopts the above-mentioned welding device 100. The welding efficiency of the welding device 100 is high, and the welding efficiency of the welding equipment 200 can also be improved.

[0359] Since the welding equipment 200 of the embodiment of the present application adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0360] In another embodiment of the present application, in combination with Figures 5 to 9, the provided welding equipment 200 also includes a conveying device 210, a first welding device 220 and a second welding device 230; the first welding device 220 is the welding device 100, and the welding station 1001 in the first welding device 220 is the first welding station 2201. The first welding head 101 and the second welding head 102 in the first welding device 220 can respectively weld the sections to be welded 240 located on opposite sides of the end cover 22; the second welding device 230 is the welding device 100, and the welding station 1001 in the second welding device 230 is the second welding station 2204. The first welding head 101 in the second welding device 230 and the second welding head 102 in the second welding device 230 can respectively weld the sections to be welded 240 located on the other opposite sides of the end cover 22; the conveying device 210 can move the jig 103 from the first welding station 2201 to the second welding station 2204.

[0361] The first welding device 220 is a welding device 100 for welding the end cover 22 and the shell 21 located at the first welding station 2201. For example, as shown in Figure 5, the first welding device 220 is used to weld the two opposite long sides of the end cover 22, namely the first section to be welded 241 and the second section to be welded 242.

[0362] The second welding device 230 is a welding device 100 for welding the end cover 22 and the shell 21 located at the second welding station 2204. For example, as shown in Figure 5, the second welding device 230 is used to weld the two opposite short sides of the end cover 22, namely the third section to be welded 243 and the fourth section to be welded 244.

[0363] In the welding equipment 200 of the embodiment of the present application, during welding, the conveying device 210 moves the jig 103 to the first welding station 2201, and the first welding head 101 and the second welding head 102 in the first welding device 220 respectively weld the sections to be welded 240 located on opposite sides of the end cover 22; after welding is completed, the conveying device 210 moves the jig 103 to the second welding station 2204, and the first welding head 101 (refer to the third welding head 231 shown in Figure 5) and the second welding head 102 (refer to the fourth welding head 232 shown in Figure 5) in the second welding device 230 respectively weld the sections to be welded 240 located on the other opposite sides of the end cover 22, so that the full circle welding of the end cover 22 and the shell 21 is achieved, and the first welding head 101 and the second welding head 102 are used to weld the opposite sides of the end cover 22 at the same time, and the third welding head 231 and the fourth welding head 232 are used to weld the other opposite sides of the end cover 22 respectively, so the welding efficiency is high.

[0364] For the convenience of description, the first welding head 101 in the second welding device 230 is referred to as a third welding head 231 , and the second welding head 102 in the second welding device 230 is referred to as a fourth welding head 232 .

[0365] In another embodiment of the present application, in combination with Figures 5 to 9, the provided welding equipment 200 has a transfer station 2203; the first welding head 101 welds the section to be welded 240 into a first section to be welded 241, the second welding head 102 welds the section to be welded 240 into a second section to be welded 242, the third welding head 231 welds the section to be welded 240 into a third section to be welded 243, and the fourth welding head 232 welds the section to be welded 240 into a fourth section to be welded 244; the fixture 103 includes a first sub-fixture 1031 and a second sub-fixture, the first sub-fixture 1031 is used to support the housing 21 with the end cover 22, and the opposite sides of the first sub-fixture 1031 are constructed with a first air-avoiding substructure 10321, and the two first air-avoiding substructures 10321 The first section to be welded 241 and the second section to be welded 242 are exposed respectively, and the conveying device 210 can convey the first sub-jig 1031 from the first welding station 2201 to the transfer station 2203; the second sub-jig is used to carry the shell 21 covered with the end cover 22, and the second sub-jig is constructed with second air-avoiding sub-structures on the opposite sides, and the two second air-avoiding sub-structures are respectively exposed for the third section to be welded 243 and the fourth section to be welded 244; the welding equipment 200 also includes a transfer device, which transfers the shell 21 covered with the end cover 22 in the first sub-jig 1031 located at the transfer station 2203 to the second sub-jig; the conveying device 210 can convey the second sub-jig from the transfer station 2203 to the second welding station 2204.

[0366] The transfer device refers to a device that can remove the shell 21 covered with the end cap 22 in the first sub-jig 1031 and place the removed shell 21 covered with the end cap 22 in the second sub-jig, wherein the transfer device can be a device such as a robot that can realize the picking and placing of items.

[0367] In the welding equipment 200 of the embodiment of the present application, during welding, the conveying device 210 conveys the first sub-jig 1031 to the first welding station 2201, and the first welding head 101 and the second welding head 102 respectively weld the first to-be-welded section 241 and the second to-be-welded section 242 through the two first air-avoiding sub-structures 10321; when welding is completed, the conveying device 210 conveys the first sub-jig 1031 to the transfer station 2203, and the transfer device takes out the shell 21 covered with the end cover 22 from the first sub-jig 1031, and then places the shell 21 covered with the end cover 22 into the second sub-jig; thereafter, the conveying device 210 conveys the second sub-jig to the second welding station 2204, and the third welding head 231 and the fourth welding head 232 respectively weld the third to-be-welded section 243 and the fourth to-be-welded section 244 through the two second air-avoiding sub-structures, thereby completing the full circle welding of the end cover 22 and the shell 21. In addition, the first sub-jig 1031 and the second sub-jig are used to expose the end cover 22 and the area to be welded 24 of the shell 21 in sections, so that the first sub-jig 1031 and the second sub-jig do not need to be disconnected. The shell 21 covered with the end cover 22 has good fixing reliability in the jig 103, which is conducive to improving the welding quality, thereby reducing the welding difficulty between the end cover 22 and the shell 21 and improving the welding effect of the end cover 22 and the shell 21.

[0368] In another embodiment of the present application, in combination with Figures 5 to 9, the provided welding equipment 200 also has a first trimming station 2202, and the conveying device 210 can convey the first sub-jig 1031 from the first welding station 2201 to the first trimming station 2202; the welding equipment 200 also includes a first trimming device, which can trim the first weld formed in the first section to be welded 241 located in the first trimming station 2202 and the second weld formed in the second section to be welded 242.

[0369] In the welding equipment 200 of the embodiment of the present application, after the welding of the first section to be welded 241 and the second section to be welded 242 is completed, a first weld structure is formed in the first section to be welded 241, and a second weld structure is formed in the second section to be welded 242; thereafter, the conveying device 210 conveys the first sub-jig 1031 to the first trimming station 2202, and the first trimming device trims the first weld structure and the second weld structure, grinding off the portions of the first weld structure and the second weld structure that protrude outside the end cover 22 and the shell 21, so that the end cover 22 and the shell 21 have good appearance quality, and can also reduce the risk of damage to other components.

[0370] In another embodiment of the present application, in combination with Figures 5 to 9, the provided welding equipment 200 also has a second trimming station 2205, and the conveying device 210 conveys the second sub-jig from the second welding station 2204 to the second trimming station 2205; the welding equipment 200 also includes a second trimming device, which can trim the third weld formed in the third section to be welded 243 located in the second trimming station 2205 and the fourth weld formed in the fourth section to be welded 244.

[0371] In the welding equipment 200 of the embodiment of the present application, after the welding of the third section to be welded 243 and the fourth section to be welded 244 is completed, a third weld structure is formed in the third section to be welded 243, and a fourth weld structure is formed in the fourth section to be welded 244; thereafter, the conveying device 210 conveys the second sub-jig to the second trimming station 2205, and then the second trimming device trims the third weld structure and the fourth weld structure, grinding off the parts of the third weld structure and the fourth weld structure that protrude outside the end cover 22 and the shell 21, so that the end cover 22 and the shell 21 have good appearance quality, and can also reduce the risk of damage to other components.

[0372] Since the welding equipment 200 of the embodiment of the present application can adopt the technical solutions of any one or several of the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0373] In one embodiment of the present application, a battery cell 20 is provided. The battery cell 20 includes a shell 21 and an end cover 22. The end cover 22 covers the shell 21. The end cover 22 and the shell 21 are welded using the above-mentioned welding method.

[0374] The battery cell 20, the end cover 22 and the shell 21 of the embodiment of the present application are welded using the above-mentioned welding method, which has high welding efficiency, is conducive to improving the production efficiency of the battery cell 20 and reducing the production cost.

[0375] Since the battery cell 20 of the embodiment of the present application can adopt the technical solutions of any one or several of the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0376] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A welding method, wherein: The following steps are involved: Placing the housing with the end cap in a jig, wherein the jig is configured with an airtight structure for exposing the area to be welded between the end cap and the housing, wherein the area to be welded includes a first section to be welded and a second section to be welded located on opposite sides of the end cap; The jig is moved to the first welding station of the welding equipment, the first welding head of the welding equipment welds the first section to be welded through the air avoidance structure, and the second welding head of the welding equipment welds the second section to be welded through the air avoidance structure, wherein the first welding station is located between the first welding head and the second welding head.

2. The welding method according to claim 1, wherein: The area to be welded includes multiple sections to be welded, each of which is correspondingly provided with a welding head. The multiple sections to be welded are sequentially connected end to end to form a ring structure. Two of the multiple sections to be welded are the first section to be welded and the second section to be welded, respectively. The welding head corresponding to the first section to be welded is the first welding head, and the welding head corresponding to the second section to be welded is the second welding head.

3. The welding method according to claim 2, wherein: The welding directions of the two welding heads corresponding to a pair of opposite sections to be welded among the multiple sections to be welded are opposite.

4. The welding method according to claim 2 or 3, wherein: The welding starting point of one of any two adjacent sections to be welded among the plurality of sections to be welded is connected to the welding end point of the other one.

5. The welding method according to claim 2, wherein: The two welding heads corresponding to a pair of opposite sections to be welded among the multiple sections to be welded have the same welding direction.

6. The welding method according to any one of claims 2, 3 or 5, wherein: At least one of the welding heads welds the corresponding section to be welded along a first direction and then welds the corresponding section to be welded in a reverse direction.

7. The welding method according to claim 6, wherein: The section to be welded is configured with a stop welding position. The welding head stops welding after welding from one end of the section to be welded along the first direction to the stop welding position, and then the welding head welds in the reverse direction to complete the welding of the unwelded area on the section to be welded.

8. The welding method according to claim 7, wherein: After the welding head is reversely welded to the stop welding position, reverse welding is continued.

9. The welding method according to claim 1 or 2, wherein: The area to be welded further includes a third section to be welded and a fourth section to be welded located on the other opposite sides of the end cover; the first section to be welded includes a first end and a second end oppositely disposed, the second section to be welded includes a third end and a fourth end oppositely disposed, the third section to be welded is connected between the first end and the third end, and the fourth section to be welded is connected between the second end and the fourth end; The welding equipment further includes a third welding head and a fourth welding head, wherein a second welding station is formed between the third welding head and the fourth welding head; The jig is moved to the second welding station, the third welding head welds the third section to be welded through the air avoidance structure, and the fourth welding head welds the fourth section to be welded through the air avoidance structure.

10. The welding method according to claim 9, wherein: The first welding head welds the first to-be-welded section along a distribution direction from the first end toward the second end, and the second welding head welds the second to-be-welded section along a distribution direction from the fourth end toward the third end; The third welding head welds the third area to be welded along a distribution direction from the third end toward the first end, and the fourth welding head welds the fourth area to be welded along a distribution direction from the second end toward the fourth end.

11. The welding method according to claim 9, wherein: The first welding head welds the first to-be-welded section along a distribution direction from the first end to the second end, and the second welding head welds the second to-be-welded section along a distribution direction from the third end to the fourth end; The third welding head welds the third area to be welded along a distribution direction from the first end toward the third end, and the fourth welding head welds the fourth area to be welded along a distribution direction from the second end toward the fourth end.

12. The welding method according to claim 11, wherein: The second welding head welds the second section to be welded along a distribution direction from the third end to the fourth end and then welds the second section to be welded in a reverse direction toward the fourth end; And / or, the fourth welding head welds the fourth section to be welded along a distribution direction from the second end toward the fourth end and then welds the fourth section to be welded in a reverse direction toward the second end.

13. A welding device, wherein: The device comprises a first welding head, a second welding head and a jig, wherein the jig is used to support the shell with the end cover, and the jig is constructed with an airtight structure for exposing the area to be welded between the end cover and the shell; A welding station is formed between the first welding head and the second welding head; Wherein, when the jig is located at the welding station, the first welding head and the second welding head respectively weld the sections to be welded located on opposite sides of the end cover through the air avoidance structure.

14. The welding device according to claim 13, wherein: The welding device further includes a first moving member connected to the first welding head and configured to drive the first welding head to move relative to the jig so that the first welding head welds the corresponding section to be welded; The welding device further includes a second moving member connected to the second welding head and configured to drive the second welding head to move relative to the jig so that the second welding head welds the corresponding section to be welded.

15. The welding device according to claim 13 or 14, wherein: The welding device further comprises a clamping mechanism, which is located at the welding station and is used to clamp and fix the shell.

16. The welding device according to claim 15, wherein: The clamping mechanism includes a fixing plate and a first side plate and a second side plate connected to the fixing plate. The first side plate, the second side plate and the fixing plate are jointly arranged to form a clamping groove, and the clamping groove is used to clamp the shell.

17. The welding device according to claim 16, wherein: The first side plate is located between the first welding head and the jig, and the second side plate is located between the second welding head and the jig.

18. The welding device according to any one of claims 13 to 17, wherein: The welding device further includes a moving mechanism, which is used to drive the jig to move, so that the first welding head welds the corresponding section to be welded, and the second welding head welds the corresponding section to be welded.

19. The welding device according to claim 18, wherein The moving mechanism includes a first conveyor belt assembly and a second conveyor belt assembly that are spaced apart. The first conveyor belt assembly and the second conveyor belt assembly can clamp the shell and enable the shell to move under the conveyance of the first conveyor belt assembly and the second conveyor belt assembly.

20. The welding device according to any one of claims 13 to 19, wherein: The fixture is constructed with a clamping plate and a receiving groove for receiving a shell covered with an end cover. The clamping plate is located at the opening of the receiving groove and is pressed against the shell and pushes the shell toward the end cover to clamp and fix the end cover and the shell.

21. A welding device, wherein: A welding device comprising the welding device according to any one of claims 13 to 20.

22. The welding apparatus according to claim 21, wherein The welding device includes a conveying device, a first welding device and a second welding device; The first welding device is the welding device, the welding station in the first welding device is a first welding station, and the first welding head in the first welding device and the second welding head in the first welding device are capable of respectively welding the sections to be welded located on opposite sides of the end cover; The second welding device is the welding device, the welding station in the second welding device is a second welding station, and the first welding head in the second welding device and the second welding head in the second welding device are capable of respectively welding the sections to be welded located on the other opposite sides of the end cover; The conveying device is capable of moving the jig from the first welding station to the second welding station.

23. A battery cell, comprising a housing and an end cover, wherein the end cover is attached to the housing, The end cover and the shell are welded using the welding method according to any one of claims 1 to 12.

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