Pressing plate assembly, welding system and welding method

Abstract

The invention discloses a pressing plate assembly, a welding system and a welding method. The pressing plate assembly comprises a pressing plate and a rotating pressing arm. The pressing plate is used for covering the end face of a welding piece. The rotating pressing arm is connected with the pressing plate, the rotating pressing arm is used for pressing the welding part through the pressing plate, and the rotating pressing arm extends in the direction away from the pressing plate and can rotate relative to the welding part so as to change the position, shielded by the rotating pressing arm and / or the pressing plate, of the edge of the welding part. Therefore, the pressing plate covers the end face of the welding part, the rotating pressing arm is connected with the pressing plate, the welding part can be pressed through the rotating pressing arm and the pressing plate so that the welding part can be tightly attached to other parts, welding of the welding part is facilitated, and the welding stability is improved; and the position of the edge, shielded by the rotating pressing arm and / or the pressing plate, of the welding part can be changed through the rotating pressing arm, welding can be conveniently conducted along the edge of the welding part while the welding part is pressed, and therefore the welding reliability and the convenience of the welding process are improved.

Description

Technical Field

[0001] The present application relates to the field of welding technology, and in particular to a pressure plate assembly, a welding system and a welding method. Background Art

[0002] Welding is the process of welding two parts together. Common welding methods include gas welding, fusion welding, laser welding, ultrasonic welding and so on.

[0003] When two parts need to be welded, the parts need to be pressed to fit the two parts, and then the parts need to be welded to fix the two parts together. However, how to smoothly weld the parts while pressing becomes a technical problem that needs to be solved urgently. Summary of the invention

[0004] The main purpose of the present application is to provide a pressure plate assembly, a welding system and a welding method, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the technical problems existing in the prior art, the present application provides a pressure plate assembly, which includes a pressure plate and a rotating pressure arm, wherein the pressure plate is used to cover the end face of the weldment; the rotating pressure arm is connected to the pressure plate, and the rotating pressure arm is used to press the weldment through the pressure plate, and the rotating pressure arm extends in a direction away from the pressure plate, and can rotate relative to the weldment to change the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate. Thus, the pressure plate is covered on the end face of the weldment, and the rotating pressure arm is connected to the pressure plate, and the weldment can be pressed by the rotating pressure arm and the pressure plate, so that the weldment and other components are closely fitted, which is convenient for welding the weldment and improves the stability of welding, and the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate can also be changed by the rotating pressure arm, which is convenient for welding along the edge of the weldment while pressing the weldment, thereby improving the reliability of welding and the convenience of the welding process.

[0006] In some embodiments, the pressure plate is used to cover the non-edge area of ​​the end face of the weldment. Therefore, when the pressure plate is covered on the non-edge area of ​​the end face of the weldment, the pressure plate can alleviate the interference of the welding operation along the edge of the weldment, improve the welding efficiency, and at the same time, the pressure plate can also shield the end face of the weldment, reducing the risk of welding beads splashing onto the end face of the weldment during welding.

[0007] In some embodiments, the rotating pressure arm can rotate relative to the pressure plate to change the position of the edge of the weldment blocked by the rotating pressure arm. Therefore, since the pressure plate cover is arranged at the non-edge area of ​​the end surface of the weldment, the position of the blocked edge of the weldment can be changed by rotating the rotating pressure arm relative to the pressure plate, thereby improving the welding efficiency, and also facilitating welding along the edge of the weldment while pressing the weldment, thereby improving the reliability of welding and the convenience of the welding process.

[0008] In some embodiments, the pressing plate has a first end face and a second end face that are arranged opposite to each other, the first end face is covered on the end face of the welding part, and the pressing plate assembly further includes a connecting column connected to the pressing plate, the connecting column protrudes from the second end face, and is connected to the rotating pressing arm. Thus, the rotating pressing arm is connected to the pressing plate through the connecting column, so that the rotating pressing arm can rotate relative to the welding part through the connecting column, and the connecting column protrudes from the second end face. When the rotating pressing arm is connected to the connecting column, the risk caused by the rotating pressing arm pressing the welding part on the pressing plate can be alleviated.

[0009] In some embodiments, the connecting column is fixedly connected to the pressure plate, and a sleeve hole is provided at one end of the rotating pressure arm. The rotating pressure arm is sleeved on the outer periphery of the connecting column through the sleeve hole, and the rotating pressure arm can rotate relative to the connecting column. Thus, the outer periphery of the connecting column is sleeved through the sleeve hole of the rotating pressure arm so that the rotating pressure arm is connected to the connecting column, which can simplify the connection form of the rotating pressure arm and the connecting column, facilitate the disassembly and maintenance of the pressure plate assembly, and the rotating pressure arm can rotate relative to the connecting column through the sleeve hole, which can change the position of the rotating pressure arm to cover the edge of the welded part in a simpler way, thereby improving the reliability of welding and the convenience of the welding process.

[0010] In some embodiments, the connecting column includes a coaxially arranged sleeve portion and a locking portion, the rotating pressure arm is sleeved on the outer periphery of the sleeve portion through the sleeve hole, and the pressure plate assembly also includes a locking member, the locking member is connected to the rotating pressure arm, and the locking member is used to match the locking portion so that the connecting column and the rotating pressure arm remain relatively fixed. Thus, the locking member and the locking portion can cooperate to keep the rotating pressure arm and the connecting column relatively fixed, and then the rotating pressure arm, the connecting column and the pressure plate remain relatively fixed, which can reduce the risk of the rotating pressure arm rotating by mistake when it does not need to rotate and affecting welding.

[0011] In some embodiments, the outer wall surface of the locking portion includes at least one pair of first locking surfaces arranged along the radial direction of the locking portion, the locking member is provided with a locking groove, the inner wall surface of the locking groove includes at least one pair of second locking surfaces arranged along the radial direction of the locking portion, the locking portion is located in the locking groove, and the first locking surface abuts against the corresponding second locking surface, so that the connecting column and the rotating pressure arm remain relatively fixed. Thus, by abutting at least one pair of first locking surfaces provided on the locking portion and at least one pair of second locking surfaces on the inner wall of the locking groove, the rotating pressure arm and the connecting column can be kept relatively fixed through the cooperation of the locking member and the locking portion, which can alleviate the risk of the rotating pressure arm rotating by mistake when it does not need to rotate and affecting welding, and the overall structure is simple, easy to process and manufacture, and reduces production costs.

[0012] In some embodiments, the notch of the locking groove faces the locking portion, and the locking member allows the locking portion to be located in the locking groove through the notch of the locking groove; or the locking member allows the locking portion to exit the locking groove through the notch of the locking groove. Thus, the notch of the locking groove is arranged toward the locking portion, which can facilitate the locking portion to be located in the locking groove or to exit the locking groove through the notch of the locking groove, thereby simplifying the method of keeping the rotating pressure arm and the connecting column relatively fixed by the locking member, and simplifying the method of releasing the relative fixation between the rotating pressure arm and the connecting column, thereby improving the efficiency of fixing or releasing the fixation, and further improving the processing efficiency of welding.

[0013] In some embodiments, the outer wall surface of the locking portion includes a first abutting surface, and the locking member includes a second abutting surface on a side surface facing the locking portion, and the locking member abuts the second abutting surface through the first abutting surface, so that the connecting column and the rotating pressure arm remain relatively fixed. Thus, through the abutment of the first abutting surface provided on the locking member and the second abutting surface provided on the locking member, the rotating pressure arm and the connecting column can be relatively fixed through the cooperation of the locking member and the locking member, which can alleviate the risk of the rotating pressure arm rotating by mistake when it is not necessary to rotate and affecting welding, and the overall structure is simple, easy to process and manufacture, and reduces production costs.

[0014] In some embodiments, one of the rotating pressure arm and the locking member is provided with a sliding groove extending in a direction away from the connecting column, and the other is provided with a sliding portion that is slidably matched with the sliding groove, and the sliding portion is used to slide in the sliding groove to make the locking member approach or move away from the locking portion. Thus, by sliding the sliding portion in the sliding groove to make the locking member approach or move away from the locking portion, the method of keeping the rotating pressure arm and the connecting column relatively fixed by the locking member can be simplified, and the method of releasing the relative fixation between the rotating pressure arm and the connecting column can be simplified, thereby improving the efficiency of fixing or releasing the fixation, and thus improving the processing efficiency of welding.

[0015] In some embodiments, the sleeve portion is closer to the pressure plate than the stop portion. Therefore, the sleeve portion is closer to the pressure plate than the stop portion, making it easier to rotate the pressure arm to press the welded part through the pressure plate, thereby improving the pressing effect. Moreover, the stop portion is away from the pressure plate, making it easier to fix the rotating pressure arm through the locking member and the stop portion.

[0016] In some embodiments, the pressure plate assembly further comprises a top component, which is fixed to an end of the locking portion away from the pressure plate, and the radial dimension of the top component is larger than the radial dimension of the locking portion. Thus, the radial dimension of the top component is larger than the radial dimension of the locking portion, and when the locking member cooperates with the locking portion to fix the rotating pressure arm, the top component can limit the locking member and the rotating pressure arm, thereby alleviating the risk of the rotating pressure arm falling off the pressure plate.

[0017] In some embodiments, the pressure plate assembly further comprises a bottom member, the connecting column is connected to the pressure plate via the bottom member, and the radial dimension of the bottom member is greater than the radial dimension of the connecting column. Thus, the radial dimension of the bottom member is greater than the radial dimension of the connecting column, and the connecting column is connected to the pressure plate via the bottom member, and the bottom member can be used to space the rotating pressure arm from the pressure plate, thereby alleviating the risk of mutual friction between the rotating pressure arm and the pressure plate during the rotation process, thereby causing damage to the rotating pressure arm and the pressure plate.

[0018] In some embodiments, the pressure plate assembly further includes a top component and an elastic component, the top component is fixed to one end of the connecting column away from the pressure plate, the radial dimension of the top component is larger than the radial dimension of the connecting column, the rotating pressure arm is located between the elastic component and the top component, and the elastic component is elastically supported between the rotating pressure arm and the pressure plate. Thus, the rotating pressure arm is elastically supported between the top component and the pressure plate by the elastic component, which can alleviate the risk of the rotating pressure arm and the pressure plate being separated, and the rotating pressure arm and the pressure plate are spaced apart by the elastic component, which alleviates the risk of the rotating pressure arm and the pressure plate being damaged by mutual friction between the rotating pressure arm and the pressure plate during the rotation process, and the rotating pressure arm can press the welded part through the elastic component and the pressure plate, which can improve the pressing effect and thus improve the processing efficiency of welding.

[0019] In some embodiments, the elastic member is sleeved on the peripheral side of the connecting column. Thus, by sleeved on the peripheral side of the connecting column, the stability of the elastic member elastically supporting the rotating pressure arm can be improved, and the risk of the elastic member detaching from the connecting column can be alleviated.

[0020] In some embodiments, one of the top member and the rotating pressure arm is provided with a fixing groove, and the other is provided with a fixing portion corresponding to the fixing groove, and the fixing portion is inserted into the fixing groove so that the connecting column and the rotating pressure arm are relatively fixed. Thus, the connecting column and the rotating pressure arm are relatively fixed through the fixing groove and the fixing portion, and then the rotating pressure arm, the connecting column and the pressure plate are relatively fixed, which can reduce the risk of the rotating pressure arm rotating by mistake when it does not need to rotate and affecting welding.

[0021] In some embodiments, the pressure plate assembly further comprises a bottom member, the radial dimension of the bottom member is greater than the radial dimension of the connecting column, the connecting column is connected to the pressure plate via the bottom member, and the elastic member is elastically supported between the rotating pressure arm and the bottom member. Thus, the radial dimension of the bottom member is greater than the radial dimension of the connecting column, and the connecting column is connected to the pressure plate via the bottom member, which can improve the stability of the connection between the connecting column and the pressure plate, and the elastic member is supported between the rotating pressure arm and the bottom member, which can also improve the stability of the elastic member elastically supporting the rotating pressure arm.

[0022] In order to solve the technical problems existing in the prior art, the present application also provides a welding system, which includes a welding device and the above-mentioned pressure plate assembly, the pressure plate assembly is used to press the weldment, and the welding device is used to weld the weldment along the edge of the weldment.

[0023] In order to solve the technical problems existing in the prior art, the present application also provides a welding method, which is applied to the above-mentioned welding system, and the welding method includes: a rotating pressure arm presses the end face of the weldment through a pressure plate; a welding device welds the weldment along the edge of the weldment; during the process of the welding device welding the weldment, the rotating pressure arm rotates relative to the weldment to change the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate. Thus, by pressing the weldment with the rotating pressure arm and the pressure plate, the weldment is closely fitted with other components, which facilitates welding of the weldment and improves the stability of welding. In addition, during the welding process, the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate can be changed by rotating the pressure arm, which facilitates welding along the edge of the weldment while pressing the weldment, thereby improving the reliability of welding and the convenience of the welding process.

[0024] In some embodiments, the step of rotating the pressing arm relative to the pressing plate includes: rotating the pressing arm along a welding direction in which the welding device welds at the edge of the weldment. Thus, the pressing arm rotates along the welding direction, and while changing the position of the edge of the weldment blocked by the pressing arm, the welding device can also weld along the edge of the weldment without interruption, thereby improving welding efficiency and reducing the risk of welding errors caused by welding interruptions.

[0025] In some embodiments, the step of rotating the pressing arm relative to the pressing plate includes: if it is detected that the welding device is welding from a first point to a second point; wherein the first point is closer to the rotating pressing arm than the second point in the welding direction of the welding device along the edge of the weldment; the rotating pressing arm rotates from the first position to the second position along the welding direction; wherein the first position includes: a position where the rotating pressing arm is between the first point and the second point in the welding direction, and the second position includes: a position where the rotating pressing arm blocks the first point and the second point in the welding direction. Thus, after the welding device is welded from the first point to the second point, the rotating pressing arm rotates from the first position to the second position again to change the position blocked by the rotating pressing arm from the first position that has not been welded to the second position that has been welded, so as to continue to press the weldment through the pressing plate without affecting the welding, which can improve the welding efficiency while alleviating the risk of welding errors caused by welding interruptions.

[0026] In some embodiments, after the step of rotating the pressing arm from the first position to the second position along the welding direction, the welding method further comprises: if it is detected that the welding device completes the welding operation, the pressing arm is rotated from the second position to the first position. Thus, after the completion of the welding operation is detected, the pressing arm is rotated back to the first position at the beginning, so that the entire processing process can be restored to the original position, which is convenient for subsequent automated pressing and welding.

[0027] In some embodiments, the step of welding the welded part along the edge of the welded part by the welding device includes: the welding device welds along the edge of the welded part to form a welded track with a closed end; the welding device welds along the closed end to a third point to form a closing track; wherein the third point is on the welded track or outside the welded track. Thus, after the welded track with a closed end is achieved, welding is continued to the third point, so that the entire welded track is more complete and the stability of the welded product is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 paying creative work.

[0029] Figure 1 is a schematic structural diagram of a battery cell according to one or more embodiments;

[0030] Figure 2 is a schematic diagram of a structure in which a pressing plate assembly is pressed on a pole cover according to one or more embodiments;

[0031] Figure 3 is a schematic diagram of a structure in which a pressure plate assembly is pressed on a weldment according to one or more embodiments;

[0032] Figure 4 is a schematic diagram of a first state of a first structure of a pressure plate assembly according to one or more embodiments;

[0033] Figure 5 is a schematic diagram of a second state of a first structure of a pressure plate assembly according to one or more embodiments;

[0034] Figure 6 yes Figure 4 A disassembled schematic diagram of the pressure plate assembly shown;

[0035] Figure 7 is a schematic diagram of a first state of a second structure of a pressure plate assembly according to one or more embodiments;

[0036] Figure 8 is a schematic diagram of a second state of a second structure of a pressure plate assembly according to one or more embodiments;

[0037] Fig. 9 is a schematic diagram of a first state of a third structure of a pressure plate assembly according to one or more embodiments;

[0038] Fig.10 is a schematic diagram of a second state of a third structure of a pressure plate assembly according to one or more embodiments;

[0039] Fig.11 is a schematic block diagram of a welding system according to one or more embodiments;

[0040] Fig.12 is a schematic flow chart of a welding method according to one or more embodiments;

[0041] Fig.13 is a schematic structural diagram of a pressing plate assembly pressing a welding part at a first position according to one or more embodiments;

[0042] Fig.14 It is a schematic structural diagram of a pressure plate assembly pressing a weldment at a second position according to one or more embodiments.

[0043] Reference numerals: battery cell 1; pole cover 2; pole body 3; housing 4; welding part 5;

[0044] The pressing plate assembly 10; the pressing plate 100; the first end surface 110; the second end surface 120; the rotating pressing arm 200; the sleeve hole 210; the sliding groove 220; the fixing portion 230; the connecting column 300; the sleeve portion 310; the locking portion 320; the first locking surface 321; the first abutting surface 322; the bottom component 400; the top component 500; the fixing groove 510; the locking member 600; the locking groove 610; the second locking surface 611; the notch 612; the sliding portion 620; the second abutting surface 630; the elastic member 700;

[0045] Welding system 20; welding device 30; first point A1; second point A2; third point A3; welding direction X. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0055] The battery can be used in an electrical device, so that the electrical device can realize the corresponding function through the electric energy provided by the battery. For example, the electrical device may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecrafts, etc.

[0056] The electrical device may be a vehicle, and the vehicle includes a battery. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle, and the battery may be provided at the bottom, head or tail of the vehicle. The battery can be used to power the vehicle, for example, the battery can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery to power the motor, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0057] The shape of the battery may include but is not limited to a square, cylindrical or other arbitrary shapes.

[0058] In some embodiments, the battery may include a housing and a plurality of battery cells, and the battery cells are contained in the housing. The housing is used to provide a storage space for the battery cells, and the plurality of battery cells may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the plurality of battery cells are both connected in series and in parallel. The plurality of battery cells may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the plurality of battery cells is contained in the housing; of course, the battery may also be a battery module formed by first connecting a plurality of battery cells in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then contained in the housing.

[0059] See also Figure 1 , Figure 1 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0060] The battery cell 1 refers to the smallest unit that constitutes the battery, and the battery cell 1 may include a shell 4, an electrode assembly, and other functional components. The shell 4 may form an internal environment for accommodating the electrode assembly, and the electrode assembly is located in the internal environment of the shell 4. The electrode assembly is a component in the battery cell 1 where an electrochemical reaction occurs, and one or more electrode assemblies may be contained in the shell. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear connects the electrode column to form a current loop.

[0061] In order to improve the product performance of the battery cell 1, the present application provides a new battery cell 1, which includes an electrode column, and the electrode column is hollow. Specifically, the electrode column may include a pole column body 3 and a pole column cover plate 2, and the pole column body 3 is annular and protrudes from the end wall of the shell 4. The portion of the shell 4 surrounding the pole column body 3 may be recessed inward to form a hollow groove, and the bottom wall of the hollow groove has an opening for the pole ear of the electrode assembly to pass through the hollow groove, and the portion of the pole ear of the electrode assembly located in the hollow groove is in contact with and conductive with the pole column body 3. The pole cover 2 can be covered on the notch of the hollow groove to seal the hollow groove. Specifically, an annular boss can be provided on the side wall of the hollow groove, and the pole cover 2 is overlapped on the annular boss so that the pole cover 2 covers the notch of the hollow groove. Furthermore, the surface of the pole cover 2 away from the bottom wall of the hollow groove can be in the same plane as the surface of the pole body 3 away from the bottom wall of the hollow groove, so as to facilitate welding between the outer edge of the pole cover 2 and the inner edge of the pole body 3, so that the pole cover 2 and the pole body 3 are fixedly connected.

[0062] See also Figure 2 , Figure 2 It is a schematic diagram of the structure in which a pressure plate assembly is pressed on a pole cover according to one or more embodiments.

[0063] When the pole cover 2 and the pole body 3 need to be welded, the pressing plate assembly 10 can press the pole cover 2 to make the pole cover 2 and the pole body 3 fit together, and then the pole cover 2 and the pole body 3 are welded to fix the pole cover 2 and the pole body 3 together.

[0064] Exemplarily, when it is necessary to weld the pole cover 2 and the pole body 3, the pole cover 2 is first placed on the notch of the hollow groove, and then the pressure plate assembly 10 is placed on the end face of the pole cover 2, and downward pressure can be applied to the pressure plate assembly 10 by other tooling equipment or manually to make the pole cover 2 and the pole body 3 fit tightly together, and then welding is performed along the upper edge where the pole cover 2 and the pole body 3 fit together to fix the pole cover 2 and the pole body 3 together.

[0065] Specifically, the welding process can be one-time. For example, during the welding process, the position of the pole cover plate 2 shielded by the welding assembly can be changed to complete the welding operation of the pole cover plate 2 and the pole body 3 without interrupting the welding operation. There can be two electrode columns on the battery cell 1, and the pole cover plates 2 and pole bodies 3 of the two electrode columns can be fixed by welding. In the actual operation process, the pole cover plate 2 of one electrode column can be pressed by a pressing plate assembly 10 first, and after the welding operation of the pole cover plate 2 and pole body 3 of one electrode column is completed, the welding operation of the pole cover plate 2 and pole body 3 of another electrode column can be welded. Alternatively, the pole cover plates 2 of the two electrode columns can be pressed simultaneously by two pressing plate assemblies 10, and then the pole cover plates 2 and pole bodies 3 of the two electrode columns are welded at the same time.

[0066] In order to relieve the pressure plate assembly 10 from blocking the position to be welded while pressing the welded part 5, the present application provides a pressure plate assembly, see Figure 3 , Figure 3 It is a schematic diagram of the structure of a pressure plate assembly pressing on a weldment according to one or more embodiments.

[0067] The pressure plate assembly 10 includes a pressure plate 100 and a rotating pressure arm 200. The pressure plate 100 is used to cover the end face of the welding part 5. The welding part 5 can be the above-mentioned pole cover 2. Of course, in other application scenarios, the welding part 5 can also be other parts that need to be welded. The pressure plate 100 can be in the shape of a plate, and the shape of the pressure plate 100 can be arbitrary. For example, the end face of the pressure plate 100 can be circular, elliptical, runway-shaped, polygonal, etc. Specifically, the shape of the end face of the pressure plate 100 can be similar to the shape of the end face of the welding part 5 pressed by the pressure plate 100. For example, when the end face of the welding part 5 pressed is in the runway shape, the end face of the pressure plate 100 used to press the welding part 5 can be in the runway shape. For example, when the end face of the welding part 5 pressed is circular, the end face of the pressure plate 100 used to press the welding part 5 can be circular.

[0068] The rotating pressure arm 200 is connected to the pressure plate 100. The rotating pressure arm 200 is used to press the welding part 5 through the pressure plate 100. The rotating pressure arm 200 extends in a direction away from the pressure plate 100 and can rotate relative to the welding part 5 to change the position of the edge of the welding part 5 blocked by the rotating pressure arm 200 and / or the pressure plate 100.

[0069] The rotating pressure arm 200 can be fixedly connected or detachably connected to the pressing plate 100. For example, the rotating pressure arm 200 can be integrated with the pressing plate 100 so that the rotating pressure arm 200 is fixedly connected to the pressing plate 100, so that the rotating pressure arm 200 drives the pressing plate 100 to rotate together. Or the rotating pressure arm 200 can be sleeved on the pressing plate 100 so that the rotating pressure arm 200 is detachably connected to the pressing plate 100. Or the rotating pressure arm 200 can also be detachably connected or fixedly connected to the pressing plate 100 through other components. The rotating pressure arm 200 can also rotate relative to the pressing plate 100, for example, the rotating pressure arm 200 can be sleeved on the outer peripheral side of the pressing plate 100 so that the rotating pressure arm 200 rotates relative to the pressing plate 100. Or the rotating pressure arm 200 is connected to the pressing plate 100 through other components, and the rotating pressure arm 200 can rotate relative to other components, thereby causing the rotating pressure arm 200 to rotate relative to the pressing plate 100. The rotating pressing arm 200 extends in a direction away from the pressing plate 100, for example, the rotating pressing arm 200 can be extended in the direction of the side wall of the pressing plate 100, so as to apply downward pressure to the rotating pressing arm 200, so that the rotating pressing arm 200 presses the welding piece 5 through the pressing plate 100. Alternatively, the rotating pressing arm 200 is connected to a side of the pressing plate 100 away from the welding piece 5, and is extended in a direction away from the welding piece 5.

[0070] During the welding process, the pressing plate 100 and / or the rotating pressing arm 200 may block the position to be welded. At this time, the rotating pressing arm 200 can be rotated relative to the weldment 5 to change the position of the edge of the weldment 5 blocked by the rotating pressing arm 200 and / or the pressing plate 100. Exemplarily, the rotating pressing arm 200 can be fixedly connected to the pressing plate 100. When the weldment 5 is pressed by the pressing plate assembly 10, the rotating pressing arm 200 and the pressing plate 100 simultaneously block the position of part of the edge of the weldment 5, so that the rotating pressing arm 200 can be rotated relative to the weldment 5, and then the rotating pressing arm 200 drives the pressing plate 100 to rotate relative to the weldment 5, thereby changing the position of the edge of the weldment 5 blocked by the rotating pressing arm 200 and the pressing plate 100. Alternatively, by way of example, when the welding piece 5 is pressed by the pressing plate assembly 10, only the pressing plate 100 blocks the position of a portion of the edge of the welding piece 5, so that the rotating pressing arm 200 can be rotated relative to the welding piece 5, and then the pressing plate 100 is driven to rotate relative to the welding piece 5 by the rotating pressing arm 200, thereby changing the position of the edge of the welding piece 5 blocked by the pressing plate 100. Alternatively, by way of example, when the welding piece 5 is pressed by the pressing plate assembly 10, only the rotating pressing arm 200 blocks the position of a portion of the edge of the welding piece 5, so that the rotating pressing arm 200 can be rotated relative to the pressing plate 100, thereby changing the position of the edge of the welding piece 5 blocked by the rotating pressing arm 200.

[0071] Through the above-mentioned embodiment, the pressure plate 100 is covered on the end face of the welding part 5, and the rotating pressure arm 200 is connected to the pressure plate 100. The welding part 5 can be pressed by rotating the pressure arm 200 and the pressure plate 100 to make the welding part 5 fit tightly with other components, which is convenient for welding the welding part 5 and improves the stability of welding. The position of the edge of the welding part 5 covered by the rotating pressure arm 200 and / or the pressure plate 100 can also be changed by rotating the pressure arm 200, which is convenient for welding along the edge of the welding part 5 while pressing the welding part 5, thereby improving the reliability of welding and the convenience of the welding process.

[0072] In some embodiments, the pressing plate 100 is used to cover the non-edge area of ​​the end face of the welding member 5. The end face of the pressing plate 100 is covered on the end face of the welding member 5, and the pressing plate 100 covers the non-edge area of ​​the end face of the welding member 5, which can be understood as: the end face of the welding member 5 covered by the pressing plate 100 is located in the middle area of ​​the end face of the welding member 5, that is, it does not overlap with the edge area of ​​the end face of the welding member 5. Or it can also be understood as: the projection of the pressing plate 100 on the end face of the welding member 5 is located in the middle area of ​​the end face of the welding member 5, that is, it does not overlap with the edge area of ​​the end face of the welding member 5. The shape of the end face of the welding piece 5 covered by the pressing plate 100 can be similar to the shape of the end face of the welding piece 5. For example, the end face of the welding piece 5 and the end face of the pressing plate 100 can be runway-shaped, circular or elliptical, etc., and the end face area of ​​the pressing plate 100 can be slightly smaller than the end face area of ​​the welding piece 5. When the pressing plate 100 is pressed on the end face of the welding piece 5, the edge of the end face of the welding piece 5 can surround the edge of the end face of the pressing plate 100, so that the pressing plate 100 can cover most of the middle area of ​​the end face of the welding piece 5 while pressing the welding piece 5. Therefore, when the pressing plate 100 is covered on the non-edge area of ​​the end face of the welding piece 5, the operation of the pressing plate 100 hindering the welding along the edge of the welding piece 5 can be alleviated, and the welding efficiency of the welding can be improved. At the same time, the end face of the welding piece 5 can be shielded by the pressing plate 100, and the risk of welding beads splashing to the end face of the welding piece 5 during welding can be alleviated.

[0073] Further, the rotating pressure arm 200 can rotate relative to the pressing plate 100 to change the position of the edge of the welding piece 5 blocked by the rotating pressure arm 200. The pressing plate 100 is used to cover the non-edge area of ​​the end face of the welding piece 5. When it is necessary to perform a welding operation on the welding piece 5 along the edge of the welding piece 5, only the rotating pressure arm 200 blocks the position of part of the edge of the welding piece 5, so that the rotating pressure arm 200 can be rotated relative to the pressing plate 100, thereby changing the position of the edge of the welding piece 5 blocked by the rotating pressure arm 200. The rotating pressure arm 200 can rotate relative to the pressing plate 100, for example, the rotating pressure arm 200 can be sleeved on the outer peripheral side of the pressing plate 100, so that the rotating pressure arm 200 rotates relative to the pressing plate 100. Or the rotating pressure arm 200 is connected to the pressing plate 100 through other components, and the rotating pressure arm 200 can rotate relative to the other components, thereby causing the rotating pressure arm 200 to rotate relative to the pressing plate 100. Therefore, since the pressure plate 100 covers the non-edge area of ​​the end face of the welding part 5, it is only necessary to rotate the pressure arm 200 relative to the pressure plate 100 to change the position of the blocked edge of the welding part 5, thereby improving the welding efficiency and facilitating welding along the edge of the welding part 5 while pressing the welding part 5, thereby improving the reliability of welding and the convenience of the welding process.

[0074] In some embodiments, the pressing plate 100 has a first end face 110 and a second end face 120 that are arranged opposite to each other, the first end face 110 is covered on the end face of the welding member 5, and the pressing plate assembly 10 further includes a connecting column 300 connected to the pressing plate 100, the connecting column 300 protrudes from the second end face 120, and is connected to the rotating pressing arm 200. The connecting column 300 protrudes from the second end face 120 of the pressing plate 100, which can reduce the influence of the connecting column 300 on the pressing plate 100. The rotating pressing arm 200 can be fixedly connected or rotatably connected to the pressing plate 100 through the connecting column 300. For example, the connecting column 300 can be fixedly connected to the pressing plate 100 and the rotating pressing arm 200 at the same time, so that the rotating pressing arm 200 is fixedly connected to the pressing plate 100. Alternatively, the connecting column 300 is rotatably connected to the pressing plate 100, and the rotating pressing arm 200 is fixedly connected to the connecting column 300, so that the rotating pressing arm 200 can be rotatably connected to the pressing plate 100 through the connecting column 300. Alternatively, the connecting post 300 is fixedly connected to the pressing plate 100, and the rotating pressing arm 200 is rotatably connected to the connecting post 300, so that the rotating pressing arm 200 and the connecting post 300 rotate relative to each other, and then the connecting post 300 and the pressing plate 100 rotate relative to each other. Thus, the rotating pressing arm 200 is connected to the pressing plate 100 through the connecting post 300, which facilitates the rotating pressing arm 200 to rotate relative to the welding piece 5 through the connecting post 300, and the connecting post 300 protrudes from the second end surface 120. When the rotating pressing arm 200 is connected to the connecting post 300, the risk caused by the rotating pressing arm 200 pressing the welding piece 5 on the pressing plate 100 can also be alleviated.

[0075] Further, the connecting column 300 is fixedly connected to the pressing plate 100, and a sleeve hole 210 is provided at one end of the rotating pressing arm 200, and the rotating pressing arm 200 is sleeved on the outer periphery of the connecting column 300 through the sleeve hole 210, so that the rotating pressing arm 200 can rotate relative to the connecting column 300. The connecting column 300 can be integrally formed with the pressing plate 100, or the connecting column 300 can be welded on the pressing plate 100, so that the connecting column 300 is fixedly connected to the pressing plate 100. The sleeve hole 210 can be a through hole, and the sleeve hole 210 can penetrate the two side surfaces of the rotating pressing arm 200 in the thickness direction of the rotating pressing arm 200, and the sleeve hole 210 can be a cylindrical hole, and at least part of the connecting column 300 can be cylindrical, and the sleeve hole 210 can be sleeved on the outer periphery of the connecting column 300 that is at least partially cylindrical, so that the rotating pressing arm 200 can rotate relative to the connecting column 300. Therefore, the outer periphery of the connecting column 300 is sleeved through the sleeve hole 210 of the rotating pressure arm 200 so that the rotating pressure arm 200 is connected to the connecting column 300, which can simplify the connection form of the rotating pressure arm 200 and the connecting column 300, facilitate the disassembly and maintenance of the pressure plate assembly 10, and the rotating pressure arm 200 can rotate relative to the connecting column 300 through the sleeve hole 210, and the position of the rotating pressure arm 200 to cover the edge of the welding part 5 can be changed in a simpler way, thereby improving the reliability of welding and the convenience of the welding process.

[0076] In some embodiments, the pressing plate assembly 10 further includes a bottom member 400, through which the connecting column 300 is connected to the pressing plate 100, and the radial dimension of the bottom member 400 is greater than the radial dimension of the connecting column 300. The bottom member 400 may be columnar, such as cylindrical or polygonal prism-shaped, and the bottom member 400 protrudes from the end surface of the pressing plate 100 away from the welding member 5, and the radial dimension of the bottom member 400 is greater than the radial dimension of the connecting column 300. When the rotating pressing arm 200 is sleeved on the connecting column 300, the connecting column 300 may be located on the side of the bottom member 400 away from the pressing plate 100. When the rotating pressure arm 200 is sleeved on the connecting column 300 through the sleeve hole 210, the surface of the rotating pressure arm 200 facing the pressure plate 100 can overlap the bottom component 400 to create a gap between the rotating pressure arm 200 and the pressure plate 100, thereby alleviating the risk of mutual friction between the rotating pressure arm 200 and the pressure plate 100 during rotation, thereby reducing the risk of damage to the rotating pressure arm 200 and the pressure plate 100.

[0077] See also Figures 4 to 6 , Figure 4 is a schematic diagram of a first state of a first structure of a pressure plate assembly according to one or more embodiments; Figure 5 is a schematic diagram of a second state of a first structure of a pressure plate assembly according to one or more embodiments; Figure 6 Figure 4 Schematic diagram of the disassembled pressure plate assembly shown.

[0078] The connecting column 300 includes a coaxially arranged sleeve portion 310 and a stop portion 320, and the rotating pressure arm 200 is sleeved on the outer periphery of the sleeve portion 310 through the sleeve hole 210. The pressing plate assembly 10 also includes a locking member 600, which is connected to the rotating pressure arm 200, and the locking member 600 is used to match the stop portion 320 so that the connecting column 300 and the rotating pressure arm 200 remain relatively fixed. The sleeve portion 310 can be cylindrical, the sleeve hole 210 can be a cylindrical hole, and the sleeve hole 210 can be sleeved on the outer periphery of the cylindrical sleeve portion 310, so that the rotating pressure arm 200 can rotate relative to the connecting column 300. The stop portion 320 can be closer to the pressing plate 100 than the sleeve portion 310, or the stop portion 320 can be farther away from the pressing plate 100 than the sleeve portion 310. The locking member 600 may be moved closer to the locking portion 320 so that the locking portion 320 and the locking member 600 are matched and kept relatively fixed, or the locking member 600 may be moved away from the locking portion 320 so that the locking portion 320 and the locking member 600 are released from the matching state. Figure 4 As shown, the locking member 600 is connected to the rotating pressure arm 200. When the locking member 600 is away from the locking portion 320 and the matching state with the locking portion 320 is cancelled, the locking member 600 and the locking portion 320 are cancelled relative to each other, and then the locking state between the rotating pressure arm 200 and the connecting column 300 is cancelled, that is, the pressure plate assembly 10 enters the unlocked state. In the unlocked state, the rotating pressure arm 200 can drive the locking member 600 to rotate relative to the connecting column 300. For example, Figure 5 As shown, the locking member 600 is connected to the rotating pressure arm 200. When the locking member 600 is close to the locking portion 320 and matches with the locking portion 320, the pressure plate assembly 10 can enter a locked state. In the locked state, the locking member 600 and the locking portion 320 remain relatively fixed, thereby making the rotating pressure arm 200 relatively fixed to the fixing member. Thus, the locking member 600 and the locking portion 320 cooperate to make the rotating pressure arm 200 and the connecting column 300 relatively fixed, thereby making the rotating pressure arm 200, the connecting column 300 and the pressure plate 100 relatively fixed, and reducing the risk of the rotating pressure arm 200 rotating by mistake when it is not necessary to rotate and affecting welding.

[0079] Further, one of the rotating pressure arm 200 and the locking member 600 is provided with a sliding groove 220 extending in a direction away from the connecting column 300, and the other is provided with a sliding portion 620 slidably matched with the sliding groove 220, and the sliding portion 620 is used to slide in the sliding groove 220 so that the locking member 600 is close to or away from the locking portion 320. In one embodiment, the sliding groove 220 is located on the side of the rotating pressure arm 200 facing the locking member 600, and the sliding portion 620 is provided on the side of the locking member 600 facing the rotating pressure arm 200, and the sliding portion 620 can slide in the sliding groove 220 to play a guiding role through the sliding groove 220, so that the locking member 600 can be close to or away from the locking portion 320. In another embodiment, the sliding groove 220 is located on the side of the locking member 600 facing the rotating pressure arm 200, and the sliding portion 620 is disposed on the side of the rotating pressure arm 200 facing the locking member 600. The sliding portion 620 can slide in the sliding groove 220, so as to play a guiding role through the sliding groove 220, so that the locking member 600 can be close to or away from the locking portion 320. Thus, the sliding portion 620 slides in the sliding groove 220 to make the locking member 600 close to or away from the locking portion 320, thereby simplifying the method of keeping the rotating pressure arm 200 and the connecting column 300 relatively fixed by the locking member 600, and simplifying the method of releasing the relative fixation between the rotating pressure arm 200 and the connecting column 300, thereby improving the efficiency of fixing or releasing the fixation, and further improving the processing efficiency of welding.

[0080] In some embodiments, the sleeve portion 310 is closer to the pressing plate 100 than the stop portion 320. The sleeve portion 310 and the stop portion 320 are coaxially arranged, and the sleeve portion 310 can be located between the stop portion 320 and the bottom member 400. The sleeve portion 310 is closer to the pressing plate 100 than the stop portion 320, that is, the sleeve portion 310 is located at the lower side of the stop portion 320, and when the rotating pressing arm 200 is sleeved on the sleeve portion 310, the rotating pressing arm 200 can be supported on the bottom member 400. The stop portion 320 is located at the upper side of the sleeve portion 310, and the locking member 600 can also be correspondingly carried on the rotating pressing arm 200, so that the locking member 600 can be fixed to the rotating pressing arm 200 without other additional fixing methods. The radial dimension of the sleeve portion 310 may be greater than the radial dimension of the stop portion 320, so that the rotating pressure arm 200 can be separated from the connecting column 300 from one end of the stop portion 320 through the sleeve hole 210, or the rotating pressure arm 200 can be sleeved on the sleeve portion 310 from one end of the stop portion 320 through the sleeve hole 210. As a result, the sleeve portion 310 is closer to the pressing plate 100 than the stop portion 320, making it easier for the rotating pressure arm 200 to press the welding member 5 through the pressing plate 100, thereby improving the pressing effect, and the stop portion 320 is away from the pressing plate 100, so that the rotating pressure arm 200 can be easily fixed by the locking member 600 cooperating with the stop portion 320.

[0081] In some embodiments, the pressure plate assembly 10 further comprises a top member 500, which is fixed to one end of the locking portion 320 away from the pressure plate 100, and the radial dimension of the top member 500 is greater than the radial dimension of the locking portion 320. The top member 500 may be columnar, such as cylindrical or polygonal prism, and the radial dimension of the top member 500 is greater than the radial dimension of the locking portion 320. When the locking member 600 matches the locking portion 320, the locking member 600 may be limited by the top member 500 and the rotating pressure arm 200, so that the locking member 600 is clamped between the top member 500 and the rotating pressure arm 200, and then the rotating pressure arm 200 is clamped between the locking member 600 and the pressure plate 100, so that the rotating pressure arm 200, the locking member 600 and the pressure plate 100 are all kept relatively fixed, so as to alleviate the situation that the rotating pressure arm 200 and the locking member 600 are separated from the pressure plate 100 after locking. In some other embodiments, the radial dimension of the locking portion 320 may be smaller than the radial dimension of the sleeve portion 310, and the radial dimension of the top component 500 may be greater than or equal to the radial dimension of the sleeve portion 310. Thus, the radial dimension of the top component 500 is greater than the radial dimension of the locking portion 320, and when the locking member 600 cooperates with the locking member 320 to fix the rotating pressure arm 200, the top component 500 can limit the locking member 600 and the rotating pressure arm 200, thereby reducing the risk of the rotating pressure arm 200 falling off the pressure plate 100.

[0082] Further, the outer wall surface of the locking portion 320 includes at least one pair of first locking surfaces 321 arranged along the radial direction of the locking portion 320, the locking member 600 is provided with a locking groove 610, the inner wall surface of the locking groove 610 includes at least one pair of second locking surfaces 611 arranged along the radial direction of the locking portion 320, the locking portion 320 is located in the locking groove 610, and the first locking surface 321 abuts against the corresponding second locking surface 611, so that the connecting column 300 and the rotating pressure arm 200 remain relatively fixed. The first locking surfaces 321 can be one pair or more pairs, and when the first locking surfaces 321 are a pair, the two first locking surfaces 321 can be arranged opposite and spaced apart in the radial direction of the locking portion 320. When there are multiple pairs of first stop surfaces 321, multiple first stop surfaces 321 can be connected in sequence along the circumference of the stop portion 320, so that multiple first stop surfaces 321 cooperate to form a prism shape. For example, when there are two pairs of first stop surfaces 321, two pairs of first stop surfaces 321 can cooperate to form a quadrangular prism, and when there are three pairs of first stop surfaces 321, three pairs of first stop surfaces 321 can cooperate to form a hexagonal prism. A pair of second stop surfaces 611 can correspond to a pair of first stop surfaces 321. When the first stop surfaces 321 and the corresponding second stop surfaces 611 abut, the connecting column 300 and the rotating pressure arm 200 can be kept relatively fixed. The second stop surface 611 can be a pair. When the rotating pressure arm 200 rotates to a specific position, it can abut with a pair of first stop surfaces 321 at the corresponding position, so that the connecting column 300 and the rotating pressure arm 200 can be kept relatively fixed. Exemplarily, when there is a pair of first stop surfaces 321, the rotating pressure arm 200 needs to rotate to a specific position corresponding to the pair of first stop surfaces 321, and then the locking member 600 is moved close to the stop portion 320 so that the stop portion 320 is located in the stop groove 610, and at this time, a pair of first stop surfaces 321 abuts against a corresponding pair of second stop surfaces 611, so that the connecting column 300 and the rotating pressure arm 200 remain relatively fixed. When there are multiple pairs of first stop surfaces 321, each pair of first stop surfaces 321 can correspond to a specific position, and when the rotating pressure arm 200 rotates to a specific position corresponding to a certain first stop surface 321, the locking member 600 is moved close to the stop portion 320 so that the stop portion 320 is located in the stop groove 610, and at this time, a pair of first stop surfaces 321 corresponding to the specific position abuts against the second stop surface 611, so that the connecting column 300 and the rotating pressure arm 200 remain relatively fixed. Therefore, by abutting at least one pair of first stopping surfaces 321 provided on the stopping portion 320 and at least one pair of second stopping surfaces 611 on the inner wall of the stopping groove 610, the locking member 600 and the stopping portion 320 can cooperate to keep the rotating pressure arm 200 and the connecting column 300 relatively fixed, thereby alleviating the risk of the rotating pressure arm 200 rotating by mistake when no rotation is required and affecting welding. The overall structure is simple, easy to process and manufacture, and reduces production costs.

[0083] Further, the notch 612 of the locking groove 610 faces the locking portion 320, and the locking member 600 makes the locking portion 320 located in the locking groove 610 through the notch 612 of the locking groove 610; or the locking member 600 makes the locking portion 320 exit the locking groove 610 through the notch 612 of the locking groove 610. The notch 612 of the locking groove 610 can face the locking portion 320, and when the locking member 600 moves in the direction close to the locking portion 320, the locking portion 320 can be located in the locking groove 610 through the notch 612, so that the first locking surface 321 and the second locking surface 611 abut, thereby making the connecting column 300 and the rotating pressure arm 200 relatively fixed, so that the pressure plate assembly 10 enters the locked state, and in the locked state, the locking member 600 and the locking portion 320 are relatively fixed, thereby making the rotating pressure arm 200 and the fixing member relatively fixed. When it is necessary to release the relative fixed state between the connecting column 300 and the rotating pressure arm 200, the locking member 600 can be moved in the direction away from the locking portion 320, so that the locking portion 320 can exit the locking groove 610 through the notch 612, thereby releasing the abutment state between the first locking surface 321 and the second locking surface 611, and allowing the pressure plate assembly 10 to enter an unlocked state. In the unlocked state, the rotating pressure arm 200 can drive the locking member 600 to rotate relative to the connecting column 300. Therefore, the notch 612 of the locking groove 610 is set toward the locking portion 320, which can facilitate the locking portion 320 to be located in the locking groove 610 or to withdraw from the locking groove 610 through the notch 612 of the locking groove 610, thereby simplifying the method of maintaining relative fixation between the rotating pressure arm 200 and the connecting column 300 through the locking member 600, and simplifying the method of releasing the relative fixation between the rotating pressure arm 200 and the connecting column 300, thereby improving the efficiency of fixing or releasing the fixation, and further improving the processing efficiency of welding.

[0084] See also Figure 7 and Figure 8 , Figure 7 is a schematic diagram of a first state of a second structure of a pressure plate assembly according to one or more embodiments; Figure 8 is a schematic diagram of a second state of a second structure of a pressure plate assembly according to one or more embodiments.

[0085] The outer wall surface of the locking portion 320 includes a first abutting surface 322 , and the locking member 600 includes a second abutting surface 630 facing the locking portion 320 . The locking member 600 abuts against the second abutting surface 630 via the first abutting surface 322 to keep the connecting column 300 and the rotating pressure arm 200 relatively fixed.

[0086] Figure 7 is a structural schematic diagram of the pressure plate assembly 10 of this embodiment in a non-locked state, Figure 8Schematic diagram of the structure of the platen assembly 10 in the locked state of the embodiment. The first abutting surface 322 and the second abutting surface 630 can be planar. When the first abutting surface 322 and the second abutting surface 630 are abutted together, the platen assembly 10 can be in a locked state, that is, the connecting column 300 and the rotating pressing arm 200 remain relatively fixed. When the first abutting surface 322 and the second abutting surface 630 are separated, the platen assembly 10 can be in a non-locked state, that is, the connecting column 300 and the rotating pressing arm 200 can rotate relative to each other. The first abutting surface 322 can be one or more. For example, the first abutting surface 322 can be two, and the two first abutting surfaces 322 are arranged opposite to each other along the radial direction of the locking portion 320. The first abutting surface 322 can also be multiple, and the multiple first abutting surfaces 322 can be connected in sequence along the circumferential direction of the locking portion 320, so that the multiple first abutting surfaces 322 cooperate to form a prism shape. A second abutting surface 630 may correspond to a first abutting surface 322. When the first abutting surface 322 and the corresponding second abutting surface 630 abut, the connecting column 300 and the rotating pressing arm 200 can be kept relatively fixed. For example, when the rotating pressing arm 200 rotates to a specific position, the second abutting surface 630 can abut against a first abutting surface 322 at a corresponding position, so that the connecting column 300 and the rotating pressing arm 200 can be kept relatively fixed. Thus, by abutting the first abutting surface 322 provided on the stopper 320 and the second abutting surface 630 provided on the locking member 600, the rotating pressing arm 200 and the connecting column 300 can be kept relatively fixed through the cooperation of the locking member 600 and the stopper 320, which can alleviate the risk of the rotating pressing arm 200 rotating by mistake when it is not necessary to rotate and affecting welding, and the overall structure is simple, easy to process and manufacture, and reduces production costs.

[0087] It should be noted that the pressure plate assembly 10 disclosed in this embodiment may be different from the pressure plate assembly 10 disclosed in the above embodiment only in the way the locking member 600 matches the locking portion 320, and the other structures may be the same or similar to the structures in the above embodiment, which will not be repeated here.

[0088] See also Fig. 9 and Fig.10 , Fig. 9 is a schematic diagram of a first state of a third structure of a pressure plate assembly according to one or more embodiments; Fig.10 is a schematic diagram of a second state of a third structure of a pressure plate assembly according to one or more embodiments.

[0089] The pressure plate assembly 10 also includes a top component 500 and an elastic component 700. The top component 500 is fixed to the end of the connecting column 300 away from the pressure plate 100. The radial dimension of the top component 500 is larger than the radial dimension of the connecting column 300. The rotating pressure arm 200 is located between the elastic component 700 and the top component 500. The elastic component 700 is elastically supported between the rotating pressure arm 200 and the pressure plate 100.

[0090] The top member 500 may be in a columnar shape, such as a cylindrical shape or a polygonal prism shape, and the top member 500 may be fixedly connected to the end of the connecting column 300 away from the pressing plate 100 in a detachable manner. For example, the top member 500 may include a stud, and the connecting column 300 may be provided with a screw hole corresponding to the stud. The stud of the top member 500 is inserted into the screw hole of the connecting column 300 to achieve a detachable connection between the top member 500 and the connecting column 300. The radial dimension of the top member 500 is greater than the radial dimension of the connecting column 300, so that the elastic member 700 and the rotating pressing arm 200 can be limited between the top member 500 and the pressing plate 100. The rotating pressure arm 200 is located between the elastic member 700 and the top member 500, and the elastic member 700 is elastically supported between the rotating pressure arm 200 and the pressing plate 100. The elastic member 700 can be used to allow a gap between the rotating pressure arm 200 and the pressing plate 100, thereby alleviating the risk of the rotating pressure arm 200 and the pressing plate 100 being damaged by mutual friction between the rotating pressure arm 200 and the pressing plate 100 during the rotation process. In a natural state, the supporting force provided by the elastic member 700 to the rotating pressure arm 200 can be slightly greater than the gravity of the rotating pressure arm 200, so that the elastic member 700 can push the rotating pressure arm 200 against the top member 500 to keep the rotating pressure arm 200 in a stationary state. When the rotating pressure arm 200 needs to be rotated, the elastic member 700 can firstly apply downward pressure to the rotating pressure arm 200, and at the same time, a circumferential rotational force is applied to the rotating pressure arm 200 so that relative rotation occurs between the rotating pressure arm 200 and the pressing plate 100. Therefore, the rotating pressure arm 200 is elastically supported between the top component 500 and the pressure plate 100 by the elastic member 700, which can reduce the risk of separation of the rotating pressure arm 200 and the pressure plate 100, and the rotating pressure arm 200 can press the welding component 5 through the elastic member 700 and the pressure plate 100, which can improve the pressing effect and thereby improve the welding processing efficiency.

[0091] Further, the elastic member 700 is sleeved on the peripheral side of the connecting column 300. The elastic member 700 may be a spring structure, so that the spring is sleeved on the peripheral side of the connecting column 300, one end of the elastic member 700 abuts on the pressing plate 100, and the other end abuts on the rotating pressing arm 200. Thus, by sleeved on the peripheral side of the connecting column 300, the stability of the elastic member 700 elastically supporting the rotating pressing arm 200 can be improved, and the risk of the elastic member 700 being separated from the connecting column 300 can be alleviated.

[0092] In some embodiments, the pressing plate assembly 10 further includes a bottom member 400, the radial dimension of the bottom member 400 is greater than the radial dimension of the connecting column 300, the connecting column 300 is connected to the pressing plate 100 through the bottom member 400, and the elastic member 700 is elastically supported between the rotating pressing arm 200 and the bottom member 400. The bottom member 400 may be columnar, such as cylindrical or polygonal prism-shaped, the bottom member 400 protrudes from the end surface of the pressing plate 100 away from the welding member 5, and the radial dimension of the bottom member 400 is greater than the radial dimension of the connecting column 300. When the rotating pressing arm 200 is sleeved on the connecting column 300, the connecting column 300 may be located on the side of the bottom member 400 away from the pressing plate 100. When the rotating pressing arm 200 is sleeved on the connecting column 300 through the sleeve hole 210, the surface of the rotating pressing arm 200 facing the pressing plate 100 may be further spaced from the pressing plate 100 through the bottom member 400. The radial dimension of the bottom component 400 is greater than the radial dimension of the connecting column 300, and the connecting column 300 is connected to the pressure plate 100 through the bottom component 400, which can improve the stability of the connection between the connecting column 300 and the pressure plate 100, and the elastic component 700 is supported between the rotating pressure arm 200 and the bottom component 400, which can also improve the stability of the elastic component 700 elastically supporting the rotating pressure arm 200.

[0093] In some embodiments, one of the top component 500 and the rotating pressure arm 200 is provided with a fixing groove 510, and the other is provided with a fixing portion 230 corresponding to the fixing groove 510, and the fixing portion 230 is inserted into the fixing groove 510 to keep the connecting column 300 and the rotating pressure arm 200 relatively fixed.

[0094] Fig. 9 is a structural schematic diagram of the pressure plate assembly 10 of this embodiment in a locked state, Fig.10 : is a schematic diagram of the structure of the pressure plate assembly 10 of this embodiment in a non-locked state. In one embodiment, the fixing groove 510 may be located on the top component 500, and the fixing portion 230 may protrude from the side of the rotating pressure arm 200 away from the pressure plate 100. In another embodiment, the fixing groove 510 may be located on the rotating pressure arm 200, and the fixing portion 230 may protrude from the side of the top component 500 toward the pressure plate 100. The fixing portion 230 and the fixing groove 510 may be in a one-to-one correspondence. When the pressure plate assembly 10 needs to be in a locked state, the fixing portion 230 can be inserted into the fixing groove 510. When the rotating pressure arm 200 needs to rotate relative to the pressure plate 100, the rotating pressure arm 200 can be pressed down first to separate the fixing portion 230 from the fixing groove 510, and then a circumferential rotational force is applied to the rotating pressure arm 200 so that the rotating pressure arm 200 rotates relative to the pressure plate 100. Exemplarily, with Fig. 9 and Fig.10 For example, when the rotating pressure arm 200 is in Fig. 9When the rotating pressure arm 200 is in the locked state, downward pressure can be applied to the rotating pressure arm 200 to separate the fixing groove 510 and the fixing portion 230, and then a force for rotating the rotating pressure arm 200 in the circumferential direction can be applied while the downward pressure is continuously applied to rotate the rotating pressure arm 200 to rotate to Fig.10 When the non-locking state is required, Fig.10 When the locking state is reached, the external force applied to the rotating pressing arm 200 can be removed. Fig.10 The non-locking state is adjusted to Fig. 9 When the rotating pressure arm 200 is in the locked state, downward pressure can be applied to the rotating pressure arm 200 again, and a force for rotating the rotating pressure arm 200 in the circumferential direction can be applied to the rotating pressure arm 200 to rotate to Fig. 9 Thus, the connecting column 300 and the rotating pressure arm 200 are relatively fixed by the fixing groove 510 and the fixing portion 230, so that the rotating pressure arm 200, the connecting column 300 and the pressure plate 100 are relatively fixed, which can reduce the risk of the rotating pressure arm 200 rotating by mistake when it is not necessary to rotate and affecting welding.

[0095] To summarize, the pressure plate 100 is covered on the end face of the welding part 5, and the rotating pressure arm 200 is connected to the pressure plate 100. The welding part 5 can be pressed by rotating the pressure arm 200 and the pressure plate 100 to make the welding part 5 fit tightly with other components, which is convenient for welding the welding part 5 and improves the stability of welding. The position of the edge of the welding part 5 covered by the rotating pressure arm 200 and / or the pressure plate 100 can also be changed by rotating the pressure arm 200, which is convenient for welding along the edge of the welding part 5 while pressing the welding part 5, thereby improving the reliability of welding and the convenience of the welding process.

[0096] In order to solve the technical problems existing in the related embodiments, the present application also provides a welding system, see Fig.11 , Fig.11 is a schematic block diagram of a welding system according to one or more embodiments.

[0097] The welding system 20 includes a welding device 30 and a pressure plate assembly 10 of any of the above embodiments. The pressure plate assembly 10 is used to press the weldment 5 , and the welding device 30 is used to weld the weldment 5 along the edge of the weldment 5 .

[0098] The welding device 30 can be a laser welding device, and laser welding has high welding efficiency and safety performance. Laser welding is to heat the surface to be processed by laser radiation, and the surface heat diffuses to the inside through heat conduction. By controlling the laser parameters such as the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool, thereby welding the two parts together. Of course, in other embodiments, the welding device may include but is not limited to a gas welding device, a fusion welding device, an ultrasonic welding device, etc. Among them, the welding system 20 may also include other devices, such as a pressing device, a conveying device, etc. The pressing device can be used to press the rotating pressing arm 200 so that the rotating pressing arm 200 presses the weldment 5 through the pressing plate 100, and the conveying device can convey the weldment 5 to the welding station, etc.

[0099] In order to solve the technical problems existing in the relevant embodiments, the present application also provides a welding method, which can be applied to the above-mentioned welding system 20, see Fig.12 , Fig.12 It is a schematic flow chart of a welding method according to one or more embodiments, specifically, it includes the following steps S1201 to S1203.

[0100] Step S1201: Rotate the pressing arm to press the end surface of the weldment through the pressing plate.

[0101] The welding part 5 can be the pole cover plate 2 mentioned above. Of course, in other application scenarios, the welding part 5 can also be other parts that need to be welded. For example, when the welding part 5 is the pole cover plate 2, the pole cover plate 2 can be first installed in the hollow groove of the pole body 3, and then the battery cell 1 is transported to the welding station, and the pressure plate 100 is then covered on the end face of the pole cover plate 2 at the welding station, and a downward pressing force is applied to the rotating pressure arm 200, so that the rotating pressure arm 200 presses the end face of the welding part 5 through the pressure plate 100, so that the pole cover plate 2 and the pole body 3 are tightly fitted, which is convenient for subsequent welding of the pole cover plate 2 and improves the stability of welding.

[0102] Step S1202: The welding device welds the weldment along the edge of the weldment.

[0103] The welding device 30 may include but is not limited to a laser welding device, a gas welding device, a fusion welding device, an ultrasonic welding device, etc. The edge of the weld 5 may be understood as the edge of the end face of the weld 5, or the side edge of the weld 5 connected to the end face of the weld 5. For example, taking the weld 5 as the pole cover plate 2, when the pole cover plate 2 is installed in the hollow groove of the pole body 3, the connection between the outer edge of the pole cover plate 2 and the inner edge of the notch of the pole body 3 may be the edge position where the welding device 30 needs to be welded.

[0104] Step S1203: During the process of welding the weldment by the welding device, the rotating pressure arm rotates relative to the weldment to change the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate.

[0105] The process of welding the weldment 5 by the welding device 30 can be understood as: the process of the welding device 30 welding the weldment 5 uninterruptedly, or, without considering whether the welding is interrupted, the entire process from the welding device 30 starting welding to the completion of the final welding can be the process of the welding device 30 welding the weldment 5. During the welding process, the pressing plate 100 and / or the rotating pressing arm 200 may block the position to be welded, and at this time, the rotating pressing arm 200 can be rotated relative to the weldment 5 to change the position of the edge of the weldment 5 blocked by the rotating pressing arm 200 and / or the pressing plate 100. Exemplarily, the rotating pressure arm 200 can be fixedly connected to the pressing plate 100. When the welding piece 5 is pressed by the pressing plate assembly 10, the rotating pressure arm 200 and the pressing plate 100 simultaneously cover the position of a portion of the edge of the welding piece 5, so that the rotating pressure arm 200 can be rotated compared to the welding piece 5, and then the rotating pressure arm 200 drives the pressing plate 100 to rotate together compared to the welding piece 5, thereby changing the position of the edge of the welding piece 5 covered by the rotating pressure arm 200 and the pressing plate 100. Or exemplarily, when the welding piece 5 is pressed by the pressing plate assembly 10, only the pressing plate 100 covers the position of a portion of the edge of the welding piece 5, so that the rotating pressure arm 200 can be rotated compared to the welding piece 5, and then the rotating pressure arm 200 drives the pressing plate 100 to rotate together compared to the welding piece 5, thereby changing the position of the edge of the welding piece 5 covered by the pressing plate 100. Or illustratively, when the welding part 5 is pressed by the pressure plate assembly 10, only the rotating pressure arm 200 covers the position of part of the edge of the welding part 5, and the rotating pressure arm 200 can be rotated compared to the pressure plate 100, thereby changing the position of the edge of the welding part 5 covered by the rotating pressure arm 200.

[0106] Through the above-mentioned embodiment, the welding part 5 is pressed by rotating the pressure arm 200 and the pressure plate 100 so that the welding part 5 and other components are tightly fitted, which facilitates welding of the welding part 5 and improves the stability of welding. In addition, during the welding process, the position of the edge of the welding part 5 covered by the rotating pressure arm 200 and / or the pressure plate 100 can be changed by rotating the pressure arm 200, which facilitates welding along the edge of the welding part 5 while pressing the welding part 5, thereby improving the reliability of welding and the convenience of the welding process.

[0107] In some embodiments, the step of rotating the pressing arm 200 relative to the pressing plate 100 includes: rotating the pressing arm 200 along the welding direction X in which the welding device 30 welds at the edge of the weldment 5. The welding direction X can be understood as the direction of the welding track formed by the welding device 30 during the welding process. For example, when the welding device 30 welds the edge of the weldment 5 in a clockwise direction, the welding direction X is in a clockwise direction. When the welding device 30 welds the edge of the weldment 5 in a counterclockwise direction, the welding direction X is in a counterclockwise direction. In this embodiment, the pressing plate 100 can be pressed on the non-edge area of ​​the end face of the weldment 5, and the rotating pressing arm 200 can be rotated compared to the pressing plate 100, that is, the rotating pressing arm 200 rotates the pressing plate 100 without rotating. Before the rotating pressing arm 200 rotates, the pressing plate assembly 10 can be first made to enter a non-locking state from a locked state, and then rotated along the welding direction X. Thus, the rotating pressure arm 200 rotates along the welding direction X, which can change the position of the edge of the welding part 5 blocked by the rotating pressure arm 200, and enable the welding device 30 to continuously weld along the edge of the welding part 5, thereby improving the welding efficiency while reducing the risk of welding errors caused by welding interruptions.

[0108] Combination Fig.13 and Fig.14 , Fig.13 It is a schematic structural diagram of a pressure plate assembly pressing a weldment at a first position according to one or more embodiments. Fig.14 It is a schematic structural diagram of a pressure plate assembly pressing a weldment at a second position according to one or more embodiments.

[0109] The step of rotating the pressing arm 200 relative to the pressing plate 100 includes: if it is detected that the welding device 30 is welded from the first point A1 to the second point A2; wherein the first point A1 is closer to the rotating pressing arm 200 than the second point A2 in the welding direction X in which the welding device 30 welds along the edge of the weldment 5; the rotating pressing arm 200 rotates from the first position to the second position along the welding direction X; wherein the first position includes: a position of the rotating pressing arm 200 outside the first point A1 and the second point A2 in the welding direction X, and the second position includes: a position between the first point A1 and the second point A2 in the welding direction X where the rotating pressing arm 200 blocks.

[0110] like Fig.13As shown, when the rotating pressure arm 200 is in the first position, the welding device 30 can start from the first point A1 and weld to the second point A2 in the counterclockwise direction. The first point A1 can be a position close to the rotating pressure arm 200. For example, the first point A1 is a position with a predetermined distance from the rotating pressure arm 200. For example, the predetermined distance can be a position greater than 2 mm, etc., which can alleviate the influence of the rotating pressure arm 200 on the welding device 30 during welding. The second point A2 can be any position. For example, the second point A2 can be: the path length between the first point A1 and the second point A2 along the welding direction X accounts for one-third, one-half or two-fifths of the path length of the edge of the weldment 5, etc. Fig.14 As shown, when it is detected that the welding device 30 is welded to the second point A2, a control signal can be generated to control the rotating pressure arm 200 to rotate from the first position to the second position through the control signal. At the second position, the rotating pressure arm 200 can only block the edge of the welded part 5 between the first point A1 and the second point A2. Since the edge of the welded part 5 between the first point A1 and the second point A2 has completed the welding operation, the rotating pressure arm 200 rotates to this point, which can alleviate the rotating pressure arm 200 from blocking the edges of other welded parts 5 that have not been welded. Therefore, after the welding device 30 is welded from the first point A1 to the second point A2, the rotating pressure arm 200 rotates from the first position to the second position again, so as to change the position blocked by the rotating pressure arm 200 from the first position that has not been welded to the second position that has been welded, so as to continue to press the welded part 5 through the pressure plate 100 without affecting the welding, which can improve the welding efficiency while alleviating the risk of welding errors caused by welding interruption.

[0111] In some embodiments, the step of welding the weldment 5 by the welding device 30 along the edge of the weldment 5 includes: the welding device 30 welds along the edge of the weldment 5 to form a welding track that is closed from beginning to end; the welding device 30 welds along the closed position to a third point A3 to form a closing track; wherein the third point A3 is on the welding track or outside the welding track. The welding track that is closed from beginning to end can be understood as: the welding device 30 starts welding from the starting point and welds the edge of the weldment 5 along the welding direction X until it is welded to the starting point again to form a circular welding track that is closed from beginning to end. Fig.13 and Fig.14For example, the first point A1 is used as the starting point, and welding is performed along the welding direction X, passing through the second point A2, and then welding to the first point A1 to form a circular welding track that is closed from beginning to end. After forming the welding track that is closed from beginning to end, the welding device 30 can continue to weld to the third point A3, and the third point A3 can be any other position except the end face of the welding part 5. For example, the third point A3 can be a position between the first point A1 and the second point A2 along the welding direction X, or the third point A3 can also be located outside the edge of the welding part 5. For example, when the welding part 5 is a pole cover plate 2, the pole cover plate 2 is installed in the hollow groove of the pole body 3, and the third point A3 can be located on the pole body 3. Therefore, after achieving the welding track that is closed from beginning to end, welding is continued to the third point A3, so that the entire welding track is more complete and the stability of the welded product is higher.

[0112] In some embodiments, after the step of rotating the pressing arm 200 from the first position to the second position along the welding direction X, the welding method further includes: if it is detected that the welding device 30 completes the welding operation, the pressing arm 200 is rotated from the second position to the first position. After the completion of the welding operation is detected, the pressing arm 200 is rotated back to the first position at the beginning, which can facilitate the entire processing process to be restored to the original position, and facilitate subsequent automated pressing and welding. Among them, rotating the pressing arm 200 from the second position to the first position may include: rotating the pressing arm 200 from the second position to the first position along the welding direction X, or rotating the pressing arm 200 from the second position to the first position in the opposite direction of the welding direction X.

[0113] To summarize, the welding part 5 is pressed by rotating the pressure arm 200 and the pressure plate 100 so that the welding part 5 fits tightly with other components, which facilitates welding of the welding part 5 and improves the stability of welding. In addition, during the welding process, the position of the edge of the welding part 5 covered by the rotating pressure arm 200 and / or the pressure plate 100 can be changed by rotating the pressure arm 200, which facilitates welding along the edge of the welding part 5 while pressing the welding part 5, thereby improving the reliability of welding and the convenience of the welding process.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pressure plate assembly, characterized in that: The pressure plate assembly comprises: A pressure plate, used for covering the end surface of the weldment; A rotating pressure arm is connected to the pressure plate, and is used to press the weldment through the pressure plate. The rotating pressure arm extends in a direction away from the pressure plate and can rotate relative to the weldment to change the position of the edge of the weldment blocked by the rotating pressure arm and / or the pressure plate.

2. The pressure plate assembly according to claim 1, characterized in that: The pressing plate is used to cover the non-edge area of ​​the end surface of the welding piece.

3. The pressure plate assembly according to claim 2, characterized in that: The rotating pressing arm can rotate relative to the pressing plate to change the position of the edge of the welding part covered by the rotating pressing arm.

4. The pressure plate assembly according to any one of claims 1 to 3, characterized in that: The pressure plate has a first end face and a second end face arranged opposite to each other, the first end face is covered on the end face of the welding part, and the pressure plate assembly also includes a connecting column connected to the pressure plate, the connecting column protrudes from the second end face and is connected to the rotating pressure arm.

5. The pressure plate assembly according to claim 4, characterized in that: The connecting column is fixedly connected to the pressure plate, and a sleeve hole is provided at one end of the rotating pressure arm. The rotating pressure arm is sleeved on the outer periphery of the connecting column through the sleeve hole, and the rotating pressure arm can rotate relative to the connecting column.

6. The pressure plate assembly according to claim 5, characterized in that: The connecting column includes a coaxially arranged sleeve portion and a locking portion, and the rotating pressure arm is sleeved on the outer periphery of the sleeve portion through the sleeve hole. The pressure plate assembly also includes a locking member, which is connected to the rotating pressure arm. The locking member is used to match the locking portion to keep the connecting column and the rotating pressure arm relatively fixed.

7. The pressure plate assembly according to claim 6, characterized in that: The outer wall surface of the locking portion includes at least a pair of first locking surfaces arranged along the radial direction of the locking portion, the locking piece is provided with a locking groove, the inner wall surface of the locking groove includes at least a pair of second locking surfaces arranged along the radial direction of the locking portion, the locking portion is located in the locking groove, and the first locking surface abuts against the corresponding second locking surface to keep the connecting column and the rotating pressure arm relatively fixed.

8. The pressure plate assembly according to claim 7, characterized in that: The notch of the locking groove faces the locking portion, and the locking member passes through the notch of the locking groove to position the locking portion in the locking groove; or the locking member passes through the notch of the locking groove to cause the locking portion to exit the locking groove.

9. The pressure plate assembly according to claim 6, characterized in that: The outer wall surface of the locking portion includes a first abutting surface, and the locking member includes a second abutting surface facing a side surface of the locking portion. The locking member abuts against the second abutting surface through the first abutting surface to keep the connecting column and the rotating pressure arm relatively fixed.

10. The pressure plate assembly according to any one of claims 6 to 9, characterized in that: One of the rotating pressure arm and the locking member is provided with a sliding groove extending in a direction away from the connecting column, and the other is provided with a sliding portion slidably matched with the sliding groove, and the sliding portion is used to slide in the sliding groove to make the locking member approach or move away from the locking portion.

11. The pressure plate assembly according to any one of claims 6 to 10, characterized in that: The sleeve portion is closer to the pressing plate than the locking portion.

12. The pressure plate assembly according to any one of claims 6 to 11, characterized in that: The pressure plate assembly further comprises a top component, the top component is fixed to an end of the stop portion away from the pressure plate, and a radial dimension of the top component is greater than a radial dimension of the stop portion.

13. The pressure plate assembly according to any one of claims 4 to 12, characterized in that: The pressure plate assembly further includes a bottom component, the connecting column is connected to the pressure plate via the bottom component, and a radial dimension of the bottom component is greater than a radial dimension of the connecting column.

14. The pressure plate assembly according to claim 5, characterized in that: The pressure plate assembly also includes a top component and an elastic component, wherein the top component is fixed to one end of the connecting column away from the pressure plate, the radial dimension of the top component is larger than the radial dimension of the connecting column, the rotating pressure arm is located between the elastic component and the top component, and the elastic component is elastically supported between the rotating pressure arm and the pressure plate.

15. The pressure plate assembly according to claim 14, characterized in that The elastic member is sleeved on the peripheral side of the connecting column.

16. The pressure plate assembly according to claim 14 or 15, characterized in that: One of the top component and the rotating pressure arm is provided with a fixing groove, and the other is provided with a fixing portion corresponding to the fixing groove, and the fixing portion is inserted into the fixing groove so that the connecting column and the rotating pressure arm remain relatively fixed.

17. The pressure plate assembly according to any one of claims 14 to 16, characterized in that: The pressure plate assembly also includes a bottom component, the radial dimension of the bottom component is greater than the radial dimension of the connecting column, the connecting column is connected to the pressure plate through the bottom component, and the elastic component is elastically supported between the rotating pressure arm and the bottom component.

18. A welding system, characterized in that: The welding system comprises a welding device and a pressure plate assembly as claimed in any one of claims 1 to 17, wherein the pressure plate assembly is used to press the weldment, and the welding device is used to weld the weldment along an edge of the weldment.

19. A welding method, characterized in that: The welding method is applied to the welding system according to claim 18, and the welding method comprises: The rotating pressing arm presses the end surface of the welding part through the pressing plate; The welding device welds the welded part along the edge of the welded part; During the process of welding the weldment by the welding device, the rotating pressure arm rotates relative to the weldment to change the position of the edge of the weldment covered by the rotating pressure arm and / or the pressure plate.

20. The welding method according to claim 19, characterized in that The step of rotating the rotating pressing arm relative to the pressing plate comprises: The rotating pressure arm rotates along a welding direction in which the welding device welds the edge of the weldment.

21. The welding method according to claim 19, characterized in that: The step of rotating the rotating pressing arm relative to the pressing plate comprises: If it is detected that the welding device welds from a first point to a second point; wherein the first point is closer to the rotating pressure arm than the second point in the welding direction of the welding device welding along the edge of the welded part; The rotating pressure arm rotates from a first position to a second position along the welding direction; wherein the first position includes: a position where the rotating pressure arm is between the first point and the second point in the welding direction, and the second position includes: a position where the rotating pressure arm blocks the first point and the second point in the welding direction.

22. The welding method according to claim 21, characterized in that After the step of rotating the rotating pressing arm from the first position to the second position along the welding direction, the welding method further comprises: If it is detected that the welding device completes the welding operation, the rotating pressing arm rotates from the second position to the first position.

23. The welding method according to claim 19, characterized in that: The step of welding the welded part by the welding device along the edge of the welded part comprises: The welding device welds along the edge of the welded part to form a closed welding track; The welding device welds along the closed part of the head and tail to a third point to form a finishing track; wherein the third point is on the welding track or outside the welding track.

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