Welding fixture and welding device comprising same

Abstract

A welding fixture and a welding device comprising same. The welding fixture comprises: a fixing base, used for fixing a battery cell; and at least one pressure plate, detachably fixed to the fixing base and used for enabling tabs of the battery cell to abut against poles, wherein the pressure plate is provided with a clearance through hole and an air channel; the clearance through hole is arranged opposite to areas to be welded of the tabs and the poles, and the air channel is communicated with the clearance through hole to guide a protective gas into the clearance through hole. In the technical solution of embodiments of the present application, the welding fixture provided by the embodiments of the present application has the advantages of controlling spatter of welding slags at said areas of the poles and the tabs and cleaning the welding slag on the poles and the tabs, so as to reduce residual welding slags in said areas of the poles and the tabs, thereby reducing the possibility that the welding slags enter the battery cell, and improving the welding quality.

Description

Welding fixture and welding equipment having the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202322940863.4 and application date October 31, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of welding equipment, and in particular, to a welding fixture and welding equipment having the welding fixture. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] In the related art, when welding the tabs and posts of an electrode assembly, the generated welding slag easily falls into the interior of the battery, and the welding slag affects the welding quality.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a welding fixture and a welding device having the welding fixture, which can reduce the possibility of welding slag entering the interior of a battery cell and improve welding quality.

[0008] In the first aspect, the present application provides a welding fixture, comprising: a fixing seat, which is used to fix a battery cell; at least one pressure plate, which is detachably fixed to the fixing seat and is used to stop the tab of the battery cell against the pole; wherein the pressure plate has an avoidance through-hole and an air passage, the avoidance through-hole is arranged opposite to the area to be welded of the tab and the pole, and the air passage is connected to the avoidance through-hole to guide the protective gas into the avoidance through-hole.

[0009] In the technical solution of the embodiments of the present application, by introducing shielding gas into the gas passage during welding, the shielding gas flows along the gas passage into the avoidance through-hole, thereby controlling the spattering of welding slag in the areas to be welded of the electrode column and the tab, and cleaning the welding slag on the electrode column and the tab to reduce the residual welding slag in the areas to be welded of the electrode column and the tab, thereby reducing the possibility of welding slag entering the interior of the battery cell and reducing the impact of welding slag on welding quality. In addition, by directing the shielding gas into the avoidance through-hole, the quality of the weld can be improved and the oxidation rate of the tab and the electrode column can be reduced.

[0010] In some embodiments, the pressure plate is provided with an adapter for connecting to a ventilation line, and the adapter is in communication with the air passage. In the above technical solution, by providing an adapter on the pressure plate, the shielding gas in the ventilation line can smoothly enter the air passage through the adapter, thereby guiding the shielding gas into the air passage. Since the air passage is in communication with the avoidance through-hole, the shielding gas flows along the air passage into the avoidance through-hole. When welding the areas to be welded of the tabs and the poles, welding slag will be formed in the areas to be welded of the poles and the poles. The shielding gas can control the splashing of the welding slag and remove the welding slag in the areas to be welded of the poles and the poles, thereby reducing the welding slag attached to the poles and the poles, thereby reducing the possibility of welding slag entering the interior of the battery cell and improving the welding quality.

[0011] In some embodiments, the avoidance through-hole is used to plug and match with the pressure nozzle of the welding equipment, and the avoidance through-hole forms an elongated hole corresponding to the shape of the pressure nozzle. In the above technical solution, the shape of the avoidance through-hole is adapted to the shape of the pressure nozzle to facilitate the plug-in fit of the pressure nozzle and the avoidance through-hole, so as to reduce the gap between the side wall of the avoidance through-hole and the pressure nozzle. On the one hand, it can reduce the possibility of the protective gas leaking in the gap between the side wall of the avoidance through-hole and the pressure nozzle, and on the other hand, it can reduce the probability of welding slag getting stuck between the avoidance through-hole and the pressure nozzle, so that the welding slag can be cleaned smoothly, which is convenient for reducing the welding slag remaining on the pole and the lug, and further reducing the possibility of welding slag entering the interior of the battery cell.

[0012] In some embodiments, the gas passage is located on one side of the avoidance through-hole in the longitudinal direction, and the outlet of the gas passage is located in the middle of the avoidance through-hole in the longitudinal direction. In the above technical solution, the outlet of the gas passage is located in the middle of the avoidance through-hole in the longitudinal direction, so that when the shielding gas is introduced, the shielding gas can enter the avoidance through-hole from the middle of the avoidance through-hole in the longitudinal direction, so that the shielding gas can be quickly and evenly distributed in the avoidance through-hole. Since the avoidance through-hole is arranged relative to the area to be welded of the pole and the tab, it is convenient to evenly distribute the shielding gas in the area to be welded of the pole and the tab, so that the shielding gas can fully clean the welding slag generated in the area to be welded of the pole and the tab, reduce the welding slag attached to the area to be welded of the pole and the tab, and facilitate to fully reduce the possibility of welding slag entering the interior of the battery cell.

[0013] In some embodiments, the pressing plate has a stop portion, which is used to stop the tab to stop the tab against the pole. In the above technical solution, the pressing plate applies pressure to the tab via the stop portion to reduce the gap between the tab and the pole, increase the contact area between the tab and the pole, and make the tab and the pole fit together as much as possible. This is conducive to firmly welding the tab and the pole together when welding the area to be welded between the tab and the pole, making it difficult for the tab and the pole to become disconnected.

[0014] In some embodiments, the stop portion is arranged around the periphery of the avoidance through-hole. In the above technical solution, the stop portion is arranged around the periphery of the avoidance through-hole so that the stop portion avoids the area to be welded of the pole and the tab, so that the welding equipment can smoothly weld the area to be welded of the pole and the tab through the avoidance through-hole, so that the tab and the pole can be smoothly welded together. In addition, the stop portion is arranged around the periphery of the avoidance through-hole so that the stop portion can stop and cooperate with the outer edge of the area to be welded of the pole and the tab, and then can press the edge of the tab and the pole, so that the edge of the area to be welded of the pole and the tab is not easy to warp, which makes it easy to ensure the flatness of the area to be welded of the pole and the tab, so as to better weld the area to be welded of the pole and the tab, so that the pole and the tab can be welded together more firmly.

[0015] In some embodiments, the stop portion forms a rib protruding from the outer surface of the pressure plate. In the above technical solution, the rib extends toward the area to be welded between the pole and the tab. In this way, when the pressure plate is fixed to the fixing seat and the rib is engaged with the tab, a certain distance is maintained between the outer surface of the pressure plate and the tab. This reduces the possibility of the tab contacting the outer surface of the pressure plate. In this way, when the pressure plate is moved, the possibility of the pressure plate driving the tab to move can be reduced, thereby ensuring that the positions of the tab and the pole correspond to each other, so that the tab and the pole can be firmly welded together.

[0016] In some embodiments, the pressure plate is provided with a fixing portion, and the fixing seat is provided with a fixing engaging portion that cooperates with the fixing portion. In the above technical solution, the fixing portion and the fixing engaging portion cooperate to removably fix the pressure plate to the fixing seat, thereby facilitating the removal of the pressure plate, and further facilitating the fixing of the battery cell to the fixing seat or the removal of the battery cell from the fixing seat, thereby facilitating the processing of the battery cell.

[0017] In some embodiments, one of the fixing portion and the fixing mating portion is a fixing hole, and the other is a fixing post that plugs into and engages with the fixing hole. In the above technical solution, the pressing plate and the fixing seat are plugged into and engage with each other via the fixing post and the fixing hole, thereby facilitating quick engagement of the pressing plate and the fixing seat, thereby facilitating quick attachment or removal of the pressing plate to the fixing seat, thereby reducing operation time and improving processing efficiency.

[0018] In some embodiments, the number of the fixing parts is at least two, and the avoidance through-hole is located between at least two of the fixing parts. In the above technical solution, at least two fixing parts are provided on the pressure plate, so that when the pressure plate is fixed on the fixed seat and the fixing parts cooperate with the fixed matching parts, the fixed matching parts can limit the rotation of the pressure plate, thereby stably fixing the pressure plate on the fixed seat. The avoidance through-hole is located on both sides of the fixing part, so that after the fixing part and the fixed matching part cooperate and the pressure plate is set on the fixed seat, the positions of both sides of the avoidance through-hole are fixed, which facilitates the precise definition of the position of the avoidance through-hole, so that the avoidance through-hole can be precisely set relative to the area to be welded of the pole and the tab, so that the welding equipment can precisely weld the area to be welded of the pole and the tab through the avoidance through-hole, thereby improving the welding accuracy.

[0019] In some embodiments, the air passage is located between one of the fixed portions and the avoidance hole. In the above technical solution, this arrangement facilitates increasing the distance between the avoidance hole and the fixed portion, thereby increasing the distance between the air passage and the fixed portion, thereby facilitating the improvement of the structural strength of the pressure plate and making it less susceptible to deformation.

[0020] In some embodiments, the fixing base includes: a positioning bracket; a fixing shell, the fixing shell being disposed on the positioning bracket and defining a receiving slot having a top opening, the receiving slot being used to receive the battery cell; wherein the pressure plate is disposed above the receiving slot, the avoidance through-hole being disposed opposite the top opening, and the pressure plate is detachably connected to the positioning bracket to secure the battery cell within the receiving slot. In the above technical solution, the receiving slot is used to receive the battery cell, and the position of the battery cell is fixed by fixing the position of the fixing shell. This not only secures the battery cell but also protects the battery cell, thereby reducing the possibility of damage to the battery cell.

[0021] In some embodiments, at least two opposing side walls of the fixed housing are provided with relief notches extending along the depth of the receiving slot and communicating with the top opening. In the above technical solution, when a battery cell is placed in the receiving slot, the relief notches are used to provide relief for instruments or hands, allowing the battery cell to be stably placed in the receiving slot, reducing the possibility of collision between the battery cell and the walls of the receiving slot, and thereby minimizing the possibility of damage to the battery cell.

[0022] In some embodiments, the positioning bracket includes: a positioning plate, the positioning plate having an installation area, the fixed shell is arranged in the installation area; a plurality of limiting members, the plurality of limiting members are arranged on the positioning plate and are arranged at intervals around the circumference of the installation area, and the pressure plate is fixedly matched with the limiting members. In the above technical solution, by setting the fixing shell in the installation area, the fixing shell can be fixed on the installation plate. When the battery cell is set in the accommodating groove, the plurality of limiting members are arranged at intervals around the circumference of the battery cell. When the pressure plate is fixedly matched with the limiting members, the relative position of the pressure plate and the battery cell can be accurately determined, so that the avoidance through-hole and the area to be welded of the pole column and the tab can be accurately arranged relative to each other. When the welding equipment welds the tab and the pole column through the avoidance through-hole, the pole column and the tab at the area to be welded of the pole column and the tab can be accurately welded together.

[0023] In some embodiments, the mounting area is provided with a positioning hole, and the fixing shell is provided in the positioning hole. In the above technical solution, the fixing shell is extended into the positioning hole, and the side wall of the positioning hole can preliminarily define the position of the fixing shell. The side wall of the positioning hole has a clamping force on the fixing shell to achieve fixed fit between the fixing shell and the positioning plate. This fixing method is relatively simple and easy to implement. It is also convenient to adjust the length of the fixing shell extending out of the positioning hole, and to adjust the distance between the top opening of the accommodating groove and the top of the limiter. When the pressure plate is fixed to the limiter, it is convenient to control the distance between the pressure plate and the battery cell, and to control the stopping force of the pressure plate on the tab on the battery cell, so as to fully stop and fit the tab with the pole, so that the welding equipment can firmly weld the tab and the pole together.

[0024] In some embodiments, the positioning plate and the limiting member are connected by fasteners. In the above technical solution, the positioning plate and the limiting member are fixedly matched by a simple method, which is convenient for reducing installation difficulty and cost.

[0025] In some embodiments, there are two pressure plates, and four stoppers are arranged in groups of two. The two stoppers in each group are located on opposite sides of the fixed shell and are fixedly engaged with the corresponding pressure plates. In the above technical solution, each pressure plate is fixedly engaged with a group of stoppers. Four stoppers are provided to position the two pressure plates on the fixed seat. The two pressure plates abut against the two tabs of the battery cell. The two pressure plates can apply pressure to the two tabs respectively, so that the two tabs can abut against the corresponding pole column. The welding equipment can weld the two tabs separately in a short time, thereby improving the welding efficiency of the welding equipment.

[0026] In a second aspect, the present application provides a welding device, comprising: a device body, the device body having a work surface; and the welding fixture in the above embodiment, the welding fixture being arranged on the work surface.

[0027] In the technical solution of the embodiment of the present application, by introducing shielding gas into the air passage during the welding process, the shielding gas enters the avoidance hole along the air passage, thereby controlling the splashing of welding slag in the area to be welded of the pole lug and the pole, and cleaning the welding slag on the pole lug and the pole to reduce the residual welding slag in the area to be welded of the pole lug and the pole, thereby improving the welding quality of the welding equipment.

[0028] In some embodiments, the device body includes: a mounting bracket, the mounting bracket is arranged on the work surface; a pressure nozzle, the pressure nozzle is arranged on the mounting bracket and is used to dock with the avoidance through-hole; and a dust removal assembly, the dust removal assembly is used to pass the protective gas into the air passage. In the above technical solution, the dust removal assembly passes the protective gas into the air passage. Since the air passage is connected to the avoidance through-hole, the protective gas enters the avoidance through-hole along the air passage. The protective gas can control the splashing of welding slag in the area to be welded of the tabs and poles, and clean the welding slag on the tabs and poles to reduce the residual welding slag on the tabs and poles, thereby reducing the possibility of welding slag entering the interior of the battery cell and improving the welding quality. In addition, by introducing the protective gas into the avoidance through-hole, the quality of the weld can be improved and the oxidation rate of the tabs and poles can be reduced.

[0029] In some embodiments, a lifting assembly is provided on the mounting bracket, and the lifting assembly is connected to the pressure nozzle to drive the pressure nozzle to move up and down. In the above technical solution, the position of the pressure nozzle in the up and down directions is adjusted by driving the pressure nozzle up and down to adapt to the situation where the pressure plate is at different heights, so that the pressure nozzle can smoothly connect with the avoidance through-hole. In addition, by applying a downward force to the pressure nozzle, the pressure nozzle can apply a downward force to the pressure plate to increase the stopping force between the pressure plate and the tab, so as to facilitate the full abutment and cooperation between the tab and the pole, so as to facilitate the more firmly fixed connection of the tab and the pole when welding the tab and the pole.

[0030] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] FIG1 is a schematic structural diagram of a welding fixture provided in some embodiments of the present application;

[0033] FIG2 is a side view of a welding fixture provided in some embodiments of the present application;

[0034] FIG3 is a cross-sectional view of a welding fixture provided in some embodiments of the present application;

[0035] FIG4 is a schematic structural diagram of a pressure plate provided in some embodiments of the present application;

[0036] FIG5 is a top view of a pressing plate provided in some embodiments of the present application;

[0037] FIG6 is a side view of a pressing plate provided in some embodiments of the present application;

[0038] FIG7 is a schematic diagram of a partial structure of a pressing plate provided in some embodiments of the present application;

[0039] FIG8 is a side view of a pressing plate provided in some embodiments of the present application;

[0040] FIG9 is an exploded view of a welding fixture provided in some embodiments of the present application;

[0041] FIG10 is a schematic structural diagram of a positioning bracket of a welding fixture provided in some embodiments of the present application;

[0042] FIG11 is a schematic structural diagram of a fixed housing provided in some embodiments of the present application;

[0043] FIG12 is a schematic structural diagram of a position-limiting member provided in some embodiments of the present application;

[0044] FIG13 is a schematic structural diagram of a positioning plate provided in some embodiments of the present application;

[0045] FIG14 is a schematic structural diagram of welding equipment provided in some embodiments of the present application;

[0046] FIG15 is a side view of a welding device provided in some embodiments of the present application.

[0047] The figure numbers in the specific implementation manner are as follows: battery cell 20, shell cover 21, pole 21a, shell body 22, electrode assembly 23, pole ear 23a, explosion-proof valve 24; welding equipment 3000, welding fixture 300; fixing seat 30, positioning bracket 31, positioning plate 311, positioning hole 3112, first connecting hole 3113, limit member 312, second connecting hole 3121, fixing shell 32, accommodating groove 321, top opening 322, avoidance gap 323, fixed matching part 35; pressing plate 40, avoidance through hole 41, air passage 42, adapter 43, stop part 44, fixing part 45, fastener 51; equipment body 600, work table 61, mounting bracket 62, lifting assembly 621, pressing nozzle 63, dust removal assembly 64, laser welding part 65, first track 661, second track 672, third track 673. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] 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).

[0054] 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", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0057] During the production process of battery cells, the tabs and the poles need to be welded together to achieve electrical connection between the tabs and the poles. The welding slag generated during the welding process will affect the welding quality and there is a risk of falling into the interior of the battery cell. If the welding slag falls into the interior of the battery cell, it is easy to cause a short circuit in the battery cell and affect the reliability of the battery cell.

[0058] In order to solve the problem of poor welding quality between the electrode tabs and the poles of the electrode assembly and the problem of welding slag easily falling into the battery cell, the present application sets an air passage on the pressure plate, and the protective gas can enter the area to be welded of the poles and the tabs through the air passage to blow the welding slag generated during the welding process to the outside of the battery cell, thereby reducing the welding slag attached to the battery cell, thereby improving the welding quality and reducing the risk of welding slag falling into the battery cell.

[0059] The welding fixture disclosed in the embodiments of this application can be used to clamp battery cells to secure them and control the position of the battery cells and welding equipment, enabling the welding equipment to accurately locate the battery cells for welding at designated locations on the battery cells. Furthermore, the welding fixture can also be used to clamp battery cells to move them, transport them, and so on.

[0060] For the convenience of description, the following embodiments are described using a welding fixture 300 according to an embodiment of the present application.

[0061] According to some embodiments of the present application, a welding fixture 300 is provided. Please refer to Figures 1 and 2. Figure 1 is a schematic structural diagram of the welding fixture 300 provided in some embodiments of the present application, and Figure 2 is a side view of the welding fixture 300 provided in some embodiments of the present application. The welding fixture 300 includes a fixing base 30, which is used to fix the position of the battery cell 20. When the battery cell 20 is processed and the battery cell 20 is subjected to a force, the position of the battery cell 20 will not be easily changed, thereby ensuring the accuracy of the processing of the battery cell 20.

[0062] Please refer to FIG. 3 , which is a cross-sectional view of a welding fixture 300 provided in some embodiments of the present application. The battery cell 20 includes a housing, an electrode assembly 23 and other functional components. The housing includes a housing cover 21 and a housing body 22 .

[0063] The shell cover 21 is a component that fits over the opening of the shell body 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the shell cover 21 can be adapted to match the shape of the shell body 22. Optionally, the shell cover 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the shell cover 21 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The shell cover 21 can be provided with functional components such as the terminal post 21a. The terminal post 21a can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the shell cover 21 can also be provided with an explosion-proof valve 24 to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The shell cover 21 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any specific limitations on this. In some embodiments, an insulating member may be provided inside the housing cover 21 to isolate the electrical connection components in the housing body 22 from the housing cover 21 to reduce the risk of short circuit.

[0064] The body 22 is a component that cooperates with the cover 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The body 22 and cover 21 can be separate components. An opening can be provided in the body 22, and the cover 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the cover 21 and body 22 can be integrated. Specifically, the cover 21 and body 22 can form a common connection surface before other components are inserted into the housing. When the interior of the body 22 needs to be enclosed, the cover 21 is placed over the body 22. The body 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the body 22 can be determined based on the specific shape and size of the electrode assembly 23. The body 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0065] The electrode assembly 23 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the shell 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active materials constitute the active material coating portion of the electrode assembly 23, and the portions of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive and negative electrode tabs 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 tab 23a connects to the pole 21a to form a current loop.

[0066] The electrode assembly 23 is arranged in the shell, and the pole 21a can be arranged on the shell cover 21 or the wall of the shell body 22 opposite to the shell cover 21. The pole ear 21a passes through the through hole on the pole 21a and is bent to cover the pole 21a. The pole ear 21a and the pole 23a can be welded together by welding to form a current loop.

[0067] 1 to 3 again, the welding fixture 300 further includes at least one pressing plate 40 , which is detachably fixed to the fixing base 30 and is used to stop the tab 23 a of the battery cell 20 against the terminal post 21 a .

[0068] Specifically, when the battery cell 20 is fixed to the fixing base 30, the pressure plate 40 can be removed to facilitate fixing the battery cell 20 to the fixing base 30. Then, the pressure plate 40 is fixed to the fixing base 30. The pressure plate 40 exerts a force on the tab 23a of the battery cell 20, so that the tab 23a and the terminal post 21a contact and mate, thereby facilitating the subsequent welding of the tab 23a and the terminal post 21a to be welded, thereby achieving electrical connection between the tab 23a and the terminal post 21a. Similarly, when the battery cell 20 needs to be removed from the fixing base 30, the pressure plate 40 is first removed from the fixing base 30, and then the battery cell 20 is removed from the fixing base 30.

[0069] In this embodiment, the pressing plate 40 and the fixing base 30 can be detachably engaged with each other by means of screws, bolts, or other components. That is, when the pressing plate 40 is removed from the fixing base 30, the pressing plate 40 and the fixing base 30 are separated. The pressing plate 40 and the fixing base 30 can also be connected by a rotating member. In this way, when the pressing plate 40 is removed from the fixing base 30, since the pressing plate 40 and the fixing base 30 are engaged by the rotating member, it is sufficient to loosen the pressing plate 40 without having to consider the placement of the pressing plate 40, thereby simplifying the operation.

[0070] The pressure plate 40 has an avoidance through-hole 41 and an air passage 42 . The avoidance through-hole 41 is arranged opposite to the area to be welded of the electrode tab 23 a and the electrode column 21 a . The air passage 42 is connected to the avoidance through-hole 41 to guide the shielding gas into the avoidance through-hole 41 .

[0071] The areas to be welded of the tab 23a and the pole 21a and the avoidance through-hole 41 are arranged relative to each other along the Z direction, so that the welding equipment 3000 can weld the areas to be welded of the tab 23a and the pole 21a from the avoidance through-hole 41, thereby welding the tab 23a and the pole 21a together to achieve electrical connection between the tab 23a and the pole 21a.

[0072] The shielding gas can be a single gas, a binary gas, or a ternary gas mixture. Single gases include argon and carbon dioxide. Binary gas mixtures include mixtures of argon and oxygen, argon and carbon dioxide, argon and helium, and argon and hydrogen. Ternary gas mixtures include mixtures of helium, argon, and carbon dioxide. In practical applications, the appropriate welding gas mixture ratio can be selected based on the material being welded.

[0073] In the technical solution of the embodiment of the present application, the gas passage 42 is connected to the avoidance hole 41 to guide the shielding gas into the avoidance hole 41. By introducing the shielding gas into the gas passage 42 during the welding process, the shielding gas enters the avoidance hole 41 along the gas passage 42, thereby controlling the spattering of welding slag in the welding area of ​​the electrode tab 23a and the electrode post 21a. The welding slag on the electrode tab 23a and the electrode post 21a can be cleaned to reduce the residual welding slag in the welding area of ​​the electrode tab 23a and the electrode post 21a. This can reduce the possibility of welding slag entering the interior of the battery cell 20 and reduce the impact of welding slag on the welding quality. In addition, by guiding the shielding gas into the avoidance hole 41, the quality of the weld can be improved and the oxidation rate of the electrode tab 23a and the electrode post 21a can be reduced.

[0074] Please refer to Figure 3, which is a cross-sectional view of a welding fixture 300 provided in some embodiments of the present application. An adapter 43 is provided on the pressure plate 40, and the adapter 43 is used to connect to the ventilation pipeline. The adapter 43 is connected to the air passage 42.

[0075] The adapter 43 is provided on the pressing plate 40. The adapter 43 may be detachably fixed to the pressing plate 40 or may be integrally formed with the pressing plate 40. For example, the adapter 43 may be detachably fixed to the pressing plate 40 by screws, bolts, or the like, or the adapter 43 may be plugged into and detachably fixed to the pressing plate 40. This is not particularly limited.

[0076] In the technical solution of the embodiment of the present application, an adapter 43 is provided on the pressure plate 40 so that the shielding gas in the ventilation line can smoothly enter the gas passage 42 through the adapter 43, and then guide the shielding gas into the gas passage 42. Since the gas passage 42 is connected with the avoidance hole 41, the shielding gas flows along the gas passage 42 to the avoidance hole 41. When welding the areas to be welded of the pole lug 23a and the pole post 21a, welding slag will be formed at the areas to be welded of the pole lug 23a and the pole post 21a. The shielding gas can control the splashing of the welding slag and remove the welding slag on the pole lug 23a and the pole post 21a to reduce the welding slag attached to the pole lug 23a and the pole post 21a, thereby reducing the possibility of welding slag entering the interior of the battery cell 20 and improving the welding quality.

[0077] 3 and further FIG4, FIG4 is a schematic structural diagram of the pressure plate 40 provided in some embodiments of the present application. The avoidance through-hole 41 is used to plug and mate with the pressure nozzle 63 of the welding device 3000, and the avoidance through-hole 41 forms an elongated hole corresponding to the shape of the pressure nozzle 63.

[0078] The avoidance through hole 41 may be in the shape of an oblong hole, a rectangular hole, etc., and no further restrictions are imposed here.

[0079] In the technical solution of the embodiment of the present application, the shape of the avoidance through-hole 41 is adapted to the shape of the pressure nozzle 63 to facilitate the plug-in fit between the pressure nozzle 63 and the avoidance through-hole 41. This facilitates reducing the gap between the side wall of the avoidance through-hole 41 and the pressure nozzle 63. On the one hand, this can reduce the possibility of shielding gas leaking in the gap between the side wall of the avoidance through-hole 41 and the pressure nozzle 63. On the other hand, it can reduce the probability of welding slag getting stuck between the avoidance through-hole 41 and the pressure nozzle 63, allowing the welding slag to be cleaned smoothly, facilitating the reduction of welding slag remaining on the tab 23a and the terminal post 21a, and further reducing the possibility of welding slag entering the interior of the battery cell 20.

[0080] Continuing with Figure 4 and further referring to Figures 5-7, Figure 5 is a top view of a pressure plate 40 provided in some embodiments of the present application, Figure 6 is a side view of a pressure plate 40 provided in some embodiments of the present application, and Figure 7 is a partial structural schematic diagram of a pressure plate 40 provided in some embodiments of the present application. The air passage 42 is located to one side of the avoidance through-hole 41 in the longitudinal direction, and the outlet of the air passage 42 is located in the middle of the longitudinal direction of the avoidance through-hole 41.

[0081] The longitudinal direction of the avoidance through hole 41 extends along the Y direction, and the air passage 42 is located on one side of the longitudinal direction of the avoidance through hole 41 .

[0082] In the technical solution of the embodiment of the present application, the avoidance through hole 41 extends along the Y direction, and the avoidance through hole 41 occupies more space in the Y direction on the pressure plate 40. The air passage 42 is set on one side of the Y direction so that the avoidance through hole 41 and the air passage 42 can be set at appropriate positions on the pressure plate 40.

[0083] In addition, the outlet of the air passage 42 is located in the middle of the length direction of the avoidance through-hole 41, so that when the shielding gas is introduced, the shielding gas can enter the avoidance through-hole 41 from the middle of the length direction of the avoidance through-hole 41, so that the shielding gas can be quickly and evenly distributed in the avoidance through-hole 41. Since the avoidance through-hole 41 is arranged relative to the area to be welded of the pole lug 23a and the pole column 21a, it is convenient to evenly distribute the shielding gas in the area to be welded of the pole lug 23a and the pole column 21a, so that the shielding gas can fully clean the welding slag generated in the area to be welded of the pole lug 23a and the pole column 21a, reduce the welding slag attached to the pole lug 23a and the pole column 21a, and fully reduce the possibility of welding slag entering the interior of the battery cell 20.

[0084] As shown in FIG5 , the longitudinal direction of the avoidance through hole 41 extends in the front-to-back direction. The air passage 42 is provided on one side of the longitudinal direction of the avoidance through hole 41 . The air passage 42 is located on the right side of the avoidance through hole 41 and extends in the front-to-back direction.

[0085] That is, the avoidance through-holes 41 and the air passages 42 both extend in the front-to-back direction and are arranged in the left-to-right direction, so that the avoidance through-holes 41 and the air passages 42 can be positioned appropriately on the pressure plate 40, thereby effectively utilizing the space on the pressure plate 40. Furthermore, this arrangement facilitates a compact arrangement of the avoidance through-holes 41 and the air passages 42, thereby reducing the space occupied by the avoidance through-holes 41 and the air passages 42 on the pressure plate 40.

[0086] Please continue to refer to Figure 7 and further to Figure 8, which is a side view of the pressure plate 40 provided in some embodiments of the present application. The pressure plate 40 has a stop portion 44, which is used to stop the tab 23a to stop the tab 23a on the pole 21a.

[0087] In the technical solution of the embodiment of the present application, the pressure plate 40 applies pressure to the pole tab 23a through the stop portion 44 to reduce the gap between the pole tab 23a and the pole post 21a, increase the contact area between the pole tab 23a and the pole post 21a, and make the pole tab 23a and the pole post 21a fit together as much as possible. In this way, when welding the areas to be welded of the pole tab 23a and the pole post 21a, it is beneficial to firmly weld the pole tab 23a and the pole post 21a together, making it difficult for the pole tab 23a and the pole post 21a to become disconnected.

[0088] 5 , 6 and 7 , the stop portion 44 is disposed around the outer periphery of the avoidance through hole 41 .

[0089] In the technical solution of the embodiment of the present application, the stop portion 44 is arranged around the outer periphery of the avoidance through hole 41, so that the stop portion 44 avoids the area to be welded of the pole lug 23a and the pole post 21a, so that the welding equipment 3000 can smoothly weld the area to be welded of the pole lug 23a and the pole post 21a through the avoidance through hole 41, so as to smoothly weld the pole lug 23a and the pole post 21a together.

[0090] Among them, the avoidance through-hole 41 is arranged relative to the area to be welded of the pole lug 23a and the pole post 21a, so that the stop portion 44 is arranged around the outer periphery of the avoidance through-hole 41, so that the stop portion 44 can be stopped and matched with the outer edge of the area to be welded of the pole lug 23a and the pole post 21a, and then the edge of the pole lug 23a and the pole post 21a can be pressed, so that the edge of the area to be welded of the pole lug 23a and the pole post 21a is not easy to warp up, which makes it easy to ensure the flatness of the area to be welded of the pole lug 23a and the pole post 21a, so as to better weld the area to be welded of the pole lug 23a and the pole post 21a, so that the pole post 21a and the pole lug 23a can be welded together more firmly.

[0091] 6 and 7 , the stop portion 44 forms a rib protruding from the outer surface of the pressing plate 40 .

[0092] In the technical solution of the embodiment of the present application, the rib extends toward the area to be welded of the pole lug 23a and the pole post 21a, so that when the pressure plate 40 is fixed on the fixing seat 30 and the rib is stopped and engaged with the pole lug 23a, there is a certain distance between the outer surface of the pressure plate 40 and the pole lug 23a, which makes it easy to reduce the possibility of contact between the pole lug 23a and the outer surface of the pressure plate 40. In this way, when the pressure plate 40 is moved, the possibility of the pressure plate 40 driving the pole lug 23a to move can be reduced, so as to ensure that the positions of the pole lug 23a and the pole post 21a correspond to each other, so that the pole lug 23a and the pole post 21a can be firmly welded together.

[0093] Continuing with Figure 4 and further referring to Figures 9 and 10, Figure 9 is an exploded view of the welding fixture 300 provided in some embodiments of the present application, and Figure 10 is a schematic diagram of the positioning bracket 31 provided in some embodiments of the present application. The pressure plate 40 is provided with a fixing portion 45, and the fixing seat 30 is provided with a fixing mating portion 35 that mates with the fixing portion 45.

[0094] In the technical solution of the embodiment of the present application, the pressure plate 40 can be detachably fixed on the fixing seat 30 through the cooperation of the fixing part 45 and the fixed matching part 35, which facilitates the disassembly of the pressure plate 40, and then facilitates the fixing of the battery cell 20 on the fixing seat 30 or the removal of the battery cell 20 from the fixing seat 30, so as to facilitate the processing of the battery cell 20.

[0095] 4 and 10 , one of the fixing portion 45 and the fixing matching portion 35 is a fixing hole, and the other is a fixing post, which is plugged into and matched with the fixing hole. The fixing hole passes through the pressure plate, and the fixing post extends along the Z direction.

[0096] In the technical solution of the embodiment of the present application, the pressure plate 40 and the fixing seat 30 are plugged into each other through the fixing column and the fixing hole, which facilitates the rapid matching of the pressure plate 40 and the fixing seat 30, so as to facilitate the rapid fixing of the pressure plate 40 on the fixing seat 30, or the rapid removal of the pressure plate 40 from the fixing seat 30, thereby reducing the operation time and improving the processing efficiency.

[0097] 1 , 4 and 9 , there are at least two fixing portions 45 , and the avoidance through hole 41 is located between the at least two fixing portions 45 .

[0098] In the technical solution of the embodiment of the present application, at least two fixing parts 45 are provided on the pressure plate 40, so that when the pressure plate 40 is fixed on the fixing seat 30 and the fixing part 45 cooperates with the fixing matching part 35, the fixing matching part 35 can limit the rotation of the pressure plate 40, thereby stably fixing the pressure plate 40 on the fixing seat 30.

[0099] Among them, the avoidance through-hole 41 is located on both sides of the fixing part 45, so that after the fixing part 45 and the fixed matching part 35 are matched and the pressure plate 40 is set on the fixing seat 30, the positions of both sides of the avoidance through-hole 41 are fixed, which is convenient for accurately defining the position of the avoidance through-hole 41, so that the avoidance through-hole 41 can be accurately set relative to the area to be welded of the pole ear 23a and the pole column 21a, so that the welding equipment 3000 can accurately weld the area to be welded of the pole ear 23a and the pole column 21a through the avoidance through-hole 41, so as to improve the welding accuracy.

[0100] 5 , the air passage 42 is located between one of the fixing portions 45 and the avoidance through hole 41 .

[0101] The avoidance through hole 41 extends in the Y direction, the air passage 42 extends in the Y direction, and the avoidance through hole 41 , the air passage 42 and the fixing portion 45 are distributed in the X direction.

[0102] In the technical solution of the embodiment of the present application, by arranging the air passage 42, the avoidance hole 41 and the fixing portion 45 at appropriate positions on the pressure plate 40, it is convenient to increase the distance between the avoidance hole 41 and the fixing portion 45, and increase the distance between the air passage 42 and the fixing portion 45, thereby facilitating the improvement of the structural strength of the pressure plate 40 and making the pressure plate 40 less prone to deformation.

[0103] Please continue to refer to Figures 2 and 10, and further to Figure 11. Figure 11 is a structural schematic diagram of the fixed shell 32 provided in some embodiments of the present application. The fixed seat 30 includes a positioning bracket 31 and a fixed shell 32. The fixed shell 32 is arranged on the positioning bracket 31, and the fixed shell 32 defines a receiving groove 321. The receiving groove 321 has a top opening 322.

[0104] The pressing plate 40 is disposed above the receiving groove 321 and is arranged opposite to the top opening 322 so as to avoid the through hole 41 . The pressing plate 40 is detachably connected to the positioning bracket 31 to fix the battery cell 20 in the receiving groove 321 .

[0105] The battery cell 20 can be set in the accommodating groove 321 from the top opening 322. The area to be welded of the pole ear 23a and the pole column 21a on the battery cell 20 is located at the top opening 322. When the pressure plate 40 is fixed on the positioning bracket 31, the pressure plate 40 closes the top opening 322 so that the battery cell 20 can be fixed in the accommodating groove 321, thereby limiting the position of the battery cell 20 and facilitating the processing of the battery cell 20.

[0106] Among them, when the pressure plate 40 is fixed on the positioning bracket 31, the avoidance through hole 41 on the pressure plate 40 is arranged opposite to the top opening 322, and the avoidance through hole 41 is arranged opposite to the area to be welded of the pole lug 23a and the pole 21a in the up and down directions. The welding equipment 3000 can weld the area to be welded of the pole lug 23a and the pole 21a through the avoidance through hole 41 to weld the pole lug 23a and the pole 21a together.

[0107] In the technical solution of the embodiment of the present application, the accommodating groove 321 is used to accommodate the battery cell 20. The position of the battery cell 20 is fixed by fixing the position of the fixing shell 32. In this way, while fixing the battery cell 20, the battery cell 20 can also be protected, thereby reducing the possibility of damage to the battery cell 20.

[0108] Please refer to Figure 11, which is a structural schematic diagram of the fixed shell 32 provided in some embodiments of the present application. At least two oppositely arranged side walls of the fixed shell 32 are provided with avoidance gaps 323, which extend along the depth direction of the accommodating groove 321 and are connected to the top opening 322.

[0109] The depth of the accommodating groove 321 extends along the Z direction, and the avoiding notch 323 extends along the Z direction.

[0110] In the technical solution of the embodiment of the present application, when the battery cell 20 is set in the accommodating groove 321, the avoidance gap 323 is used to avoid the instrument or hand, so that the battery cell 20 can be stably set in the accommodating groove 321, reducing the possibility of the battery cell 20 colliding with the wall of the accommodating groove 321, and facilitating reducing the possibility of damage to the battery cell 20.

[0111] Please continue to refer to Figure 10, and further to Figures 12 and 13. Figure 12 is a schematic diagram of the structure of a limiter 312 provided in some embodiments of the present application, and Figure 13 is a schematic diagram of the structure of a positioning plate 311 provided in some embodiments of the present application. The positioning bracket 31 includes a positioning plate 311 and a plurality of limiters 312. The positioning plate 311 has an installation area, the fixed shell 32 is disposed in the installation area, and the plurality of limiters 312 are disposed on the positioning plate 311. The plurality of limiters 312 are spaced apart circumferentially around the installation area, and the pressure plate 40 is fixedly engaged with the limiters 312.

[0112] In the technical solution of the embodiment of the present application, by setting the fixing shell 32 in the installation area, the fixing shell 32 can be fixed on the installation plate. When the battery cell 20 is set in the accommodating groove 321, multiple limit members 312 are arranged at circumferential intervals around the battery cell 20. When the pressure plate 40 is fixedly matched with the limit members 312, the relative positions of the pressure plate 40 and the battery cell 20 can be accurately determined, so that the avoidance through hole 41 and the area to be welded of the pole lug 23a and the pole column 21a can be accurately set relative to each other. When the welding equipment 3000 welds the pole lug 23a and the pole column 21a through the avoidance through hole 41, the pole column 21a and the pole lug 23a at the area to be welded of the pole lug 23a and the pole column 21a can be accurately welded together.

[0113] 13 , the mounting area is provided with a positioning hole 3112, and the fixing shell 32 is disposed in the positioning hole 3112. The positioning hole 3112 passes through the positioning plate 311, and the fixing shell 32 can extend into the positioning hole 3112 to fix the fixing shell 32 in the mounting area of ​​the positioning plate 311.

[0114] In the technical solution of the embodiment of the present application, the positioning plate 311 can limit the position of the fixed shell 32 along the X direction and the Y direction. After the battery cell 20 is set in the accommodating groove 321, the fixed shell 32 limits the position of the battery cell 20 along the X direction and the Y direction to fix the battery cell 20 on the fixing seat 30. In this way, when the pressure plate 40 is fixedly matched with the limit member 312, the relative position of the battery cell 20 and the pressure plate 40 can be accurately determined.

[0115] When the locking cam 311 is in the closed position, the locking cam 311 is in the closed position, and the locking cam 311 is in the closed position, so that the locking cam 311 is in the closed position.

[0116] In this embodiment, when the fixed shell 32 is set in the positioning hole 3112, the side wall of the limit member 312 is abutted against the side wall of the fixed shell 32 to further limit the position of the fixed shell 32, thereby reducing the possibility of shaking of the fixed shell 32, so that the avoidance through hole 41 can be accurately arranged relative to the area to be welded of the pole tab 23a and the pole post 21a, so that the welding equipment 3000 can accurately weld the area to be welded of the pole tab 23a and the pole post 21a through the avoidance through hole 41.

[0117] Continuing to refer to FIG. 12 and FIG. 13 , the positioning plate 311 and the limiting member 312 are connected via a fastener 51 .

[0118] In the technical solution of the embodiment of the present application, the fixed fit between the positioning plate 311 and the limiting member 312 is achieved through a simple method, which makes it easy to reduce the difficulty of installation and reduce costs.

[0119] Specifically, as shown in Figures 12 and 13, the positioning bracket 31 includes a positioning plate 311 and a plurality of limiting members 312. The positioning plate 311 has a plurality of first connection holes 3113, and the bottom of the limiting member 312 has a second connection hole 3121. The fastener 51 passes through the first connection hole 3113 and the second connection hole 3121 to fix the positioning plate 311 and the fastener 51 together, and then the position of the fixed shell 32 is fixed by using the positioning plate 311 and the limiting member 312. The battery cell 20 is arranged in the fixed shell 32. By fixing the limiting member 312 to the pressure plate 40, the pressure plate 40 is used to stop at the pole ear 23a of the battery cell 20, so that the pole ear 23a is stopped and matched with the pole post 21a, so as to facilitate the welding equipment 3000 to weld the pole ear 23a and the pole post 21a together.

[0120] The fastener 51 can be a screw, and the second connecting hole 3121 has an internal thread. The fastener 51 passes through the first connecting hole 3113 and is threadedly engaged with the second connecting hole 3121 to fix the positioning plate 311 and the limiter 312 together. The fastener 51 can also be an expansion screw, a pin, etc., which is not limited here.

[0121] 1 , there are two pressing plates 40 , and four limiting members 312 , which form a group of two. The two limiting members 312 in each group are located on opposite sides of the fixed shell 32 and fixedly engaged with the corresponding pressing plates 40 .

[0122] In the technical solution of the embodiment of the present application, each pressure plate 40 is fixedly matched with a group of limit members 312, and four limit members 312 are provided to place the two pressure plates 40 on the fixed seat 30. The two pressure plates 40 are stopped at the two pole ears 23a of the battery cell 20. The two pressure plates 40 can apply pressure to the two pole ears 23a respectively so that the two pole ears 23a can be stopped and matched with the corresponding pole column 21a. The welding equipment 3000 can weld the two pole ears 23a respectively in a short time, which is convenient for improving the welding efficiency of the welding equipment 3000.

[0123] As shown in Figures 1 and 12, four stoppers 312 are arranged in intervals along the front-to-back and left-to-right directions around the circumference of the installation area. One group of stoppers 312 is located near the front side of the positioning plate 311, and another group of stoppers 312 is located near the rear side of the positioning plate 311. The two stoppers 312 in each group are located opposite each other in the left-to-right direction, and each stopper 312 is provided with a fixing post at the top. The length of the pressure plate 40 extends in the left-to-right direction. The pressure plate 40 is provided with two positioning holes 3112, which are spaced apart in the left-to-right direction. Each pressure plate 40 is fixedly engaged with the two stoppers 312.

[0124] In this embodiment, the battery cell 20 includes a positive electrode ear and a negative electrode ear. A group of limit members 312 are located on the left and right sides of the positive electrode ear of the battery cell 20, and another group of limit members 312 are located on the left and right sides of the negative electrode ear of the battery cell 20. When the pressure plate 40 is fixed on the limit member 312, the two pressure plates 40 are respectively arranged opposite to the positive electrode ear and the negative electrode ear. The two pressure plates 40 are respectively stopped at the positive electrode ear and the negative electrode ear, and the positive electrode ear and the positive electrode column are stopped and matched, so that the negative electrode ear and the negative electrode column are stopped and matched. In this way, when the welding equipment 3000 welds the electrode ear 23a and the electrode column 21a to be welded, the positive electrode ear and the positive electrode column can be welded together, and the negative electrode ear and the negative electrode column can be welded together in a short time, so as to improve the welding efficiency.

[0125] According to some embodiments of the present application, a welding fixture 300 is provided. The welding fixture 300 includes a fixing base 30 and two pressing plates 40. The fixing base 30 includes a positioning bracket 31 and a fixing shell 32. The fixing shell 32 defines a receiving groove 321 with a top opening 322. The battery cell 20 is placed in the receiving groove 321. The fixing shell 32 is fixed to the positioning bracket 31. The pressing plates 40 are fixed to the positioning bracket 31. The pressing plates 40 have avoidance holes 41. The battery cell 20 includes two tabs 23a. The avoidance holes 41 on the two pressing plates 40 are arranged one-to-one opposite the two tabs 23a in the vertical direction.

[0126] The lower surface of the pressing plate 40 has a stop portion 44. The stop portion 44 protrudes from the outer surface of the pressing plate 40 and extends downward. The stop portion 44 extends circumferentially around the avoidance through hole 41. When the pressing plate 40 is fixed to the positioning bracket 31, the stop portion 44 abuts against the corresponding tab 23a to apply a force to the tab 23a, causing the tab 23a to abut against the pole 21a, thereby facilitating welding the tab 23a and the pole 21a together.

[0127] The pressure plate 40 is provided with an air passage 42, which is connected to the avoidance hole 41 to lead the shielding gas into the avoidance hole 41. Since welding slag will be generated when the pole tab 23a and the pole column 21a are welded together, the shielding gas can control the splashing of the welding slag and clean the welding slag on the pole tab 23a and the pole column 21a to reduce the welding slag attached to the surface of the pole tab 23a and the pole column 21a, thereby reducing the possibility of welding slag entering the interior of the battery cell 20 and improving the welding quality.

[0128] According to some embodiments of the present application, the present application further provides a welding device 3000. Referring to FIG14, FIG14 is a schematic structural diagram of the welding device 3000 provided in some embodiments of the present application, and the welding device 3000 includes a device body 600 and a welding fixture 300 according to any of the above solutions.

[0129] The equipment body 600 has a work surface 61, and the welding fixture 300 is arranged on the work surface 61. The work surface 61 can be a flat surface, and the position of the welding fixture 300 on the work surface 61 can be fixed or movable.

[0130] In the technical solution of the embodiment of the present application, by introducing shielding gas into the gas passage 42 during the welding process, the shielding gas enters the avoidance hole 41 along the gas passage 42, thereby controlling the splashing of welding slag in the area to be welded of the pole lug 23a and the pole post 21a, and cleaning the welding slag on the pole lug 23a and the pole post 21a to reduce the residual welding slag in the area to be welded of the pole lug 23a and the pole post 21a, thereby improving the welding quality of the welding equipment 3000.

[0131] 14 and further FIG15 , which is a side view of a welding device 3000 provided in some embodiments of the present application. In some embodiments of the present application, the device body 600 includes a mounting bracket 62 and a pressure nozzle 63 . The mounting bracket 62 is disposed on the work surface 61 , and the pressure nozzle 63 is disposed on the mounting bracket 62 . The pressure nozzle 63 is used to dock with the avoidance through-hole 41 .

[0132] The equipment body 600 further includes a dust removal assembly 64 , which is used to pass protective gas into the gas passage 42 .

[0133] Because the gas passage 42 is connected to the avoidance hole 41, the shielding gas introduced by the dust removal assembly 64 flows along the gas passage 42 into the avoidance hole 41. The shielding gas can control the spatter of welding slag in the welding area of ​​the electrode tab 23a and the electrode post 21a and clean the welding slag on the electrode tab 23a and the electrode post 21a, thereby reducing the residual welding slag on the electrode tab 23a and the electrode post 21a. This can reduce the possibility of welding slag entering the interior of the battery cell 20 and improve the welding quality. In addition, by directing the shielding gas into the avoidance hole 41, the quality of the weld can be improved and the oxidation rate of the electrode tab 23a and the electrode post 21a can be reduced.

[0134] 15 , a lifting assembly 621 is provided on the mounting bracket 62 , and the lifting assembly 621 is connected to the pressing nozzle 63 to drive the pressing nozzle 63 to move up and down.

[0135] In the above technical solution, by driving the pressure nozzle 63 to move up and down, the position of the pressure nozzle 63 in the up and down directions can be adjusted to adapt to the situation where the pressure plate 40 is at different heights, so that the pressure nozzle 63 can smoothly connect with the avoidance through hole 41.

[0136] In addition, by applying a downward force to the pressure nozzle 63, the pressure nozzle 63 can apply a downward force to the pressure plate 40 to increase the stopping force between the pressure plate 40 and the pole tab 23a, so as to facilitate the pole tab 23a and the pole post 21a to fully abut and fit together, so that when the pole tab 23a and the pole post 21a are welded, the pole tab 23a and the pole post 21a can be welded together more firmly.

[0137] As shown in Figure 14, in this embodiment, a first movable component is provided on the work surface 61, and the welding fixture 300 is provided on the first movable component. The first movable component includes a first track 661 extending along the Y direction. The welding fixture 300 is movably provided on the first track 661 to adjust the position of the welding fixture 300 in the Y direction, thereby facilitating the adjustment of the position between the welding fixture 300 and the pressing nozzle 63, so as to facilitate the placement of the battery cell 20 in the welding fixture 300 or the removal of the battery cell 20 from the welding fixture 300.

[0138] As shown in Figure 14, in this embodiment, the welding equipment 3000 also includes a laser welding part 65 and a second movable component. The second movable component is arranged on the work table 61. The second movable component includes a second track 672 extending along the X direction and a third track 673 extending along the Z direction. The laser welding part 65 is arranged on the third track 673, and the third track 673 is arranged on the second track 672, so that the position of the laser welding part 65 along the Z direction and the X direction can be adjusted, so that the laser welding part 65 can fully weld the areas to be welded of the pole ear 23a and the pole column 21a.

[0139] 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 welding fixture, wherein: include: A fixing seat, the fixing seat is used to fix the battery cell; At least one pressing plate, the pressing plate is detachably fixed to the fixing seat and is used to stop the tab of the battery cell against the pole; The pressing plate has an avoidance through hole and a gas passage, the avoidance through hole is arranged opposite to the area to be welded of the pole lug and the pole, and the gas passage is connected with the avoidance through hole to guide the protective gas into the avoidance through hole.

2. The welding fixture according to claim 1, wherein: The pressure plate is provided with an adapter for connecting to a ventilation pipeline, and the adapter is communicated with the air passage.

3. The welding fixture according to claim 1 or 2, wherein: The avoidance through hole is used for plugging and matching with the pressure nozzle of welding equipment, and the avoidance through hole forms an elongated hole corresponding to the shape of the pressure nozzle.

4. The welding fixture according to claim 3, wherein: The air passage is located at one side of the avoidance through hole in the length direction, and the outlet of the air passage is located at the middle of the avoidance through hole in the length direction.

5. The welding fixture according to any one of claims 1 to 4, wherein: The pressing plate has a stop portion, and the stop portion is used to stop the pole lug so as to stop the pole lug on the pole column.

6. The welding fixture according to claim 5, wherein: The stop portion is arranged around the outer periphery of the avoidance through hole.

7. The welding jig according to claim 5 or 6, wherein: The stop portion forms a convex rib protruding from the outer surface of the pressing plate.

8. The welding fixture according to any one of claims 1 to 7, wherein: The pressing plate is provided with a fixing portion, and the fixing seat is provided with a fixing matching portion matching with the fixing portion.

9. The welding fixture according to claim 8, wherein: One of the fixing portion and the fixing matching portion is a fixing hole, and the other is a fixing column plug-matched with the fixing hole.

10. The welding jig according to claim 8 or 9, wherein: The number of the fixing parts is at least two, and the avoidance through hole is located between at least two of the fixing parts.

11. The welding fixture according to claim 10, wherein: The air passage is located between one of the fixing portions and the avoidance through hole.

12. The welding fixture according to any one of claims 1 to 11, wherein: The fixing seat comprises: Positioning bracket; A fixing shell, the fixing shell is arranged on the positioning bracket and defines a receiving groove with a top opening, the receiving groove is used to receive the battery monomer; Wherein, the pressing plate is arranged above the receiving groove and the avoiding through hole is arranged opposite to the top opening, and the pressing plate is detachably connected to the positioning bracket to fix the battery monomer in the receiving groove.

13. The welding fixture according to claim 12, wherein: At least two oppositely disposed side walls of the fixed shell are provided with avoidance notches, and the avoidance notches extend along the depth direction of the accommodating groove and are communicated with the top opening.

14. The welding fixture according to claim 12 or 13, wherein: The positioning bracket comprises: A positioning plate, wherein the positioning plate has an installation area, and the fixing shell is arranged in the installation area; A plurality of limiting members are provided on the positioning plate and are arranged at intervals around the circumference of the installation area, and the pressure plate is fixedly matched with the limiting members.

15. The welding fixture according to claim 14, wherein: The installation area is provided with a positioning hole, and the fixing shell is arranged in the positioning hole.

16. The welding fixture according to claim 14 or 15, wherein: The positioning plate is connected to the limiting member via a fastener.

17. The welding fixture according to any one of claims 14 to 16, wherein: The number of the pressing plates is two, the number of the limiting members is four and they form a group of two. The two limiting members in each group are located at opposite sides of the fixed shell and fixedly matched with the corresponding pressing plates.

18. A welding device, wherein: include: An equipment body, wherein the equipment body has a work surface; A welding fixture, wherein the welding fixture is arranged on the work surface, and the welding fixture is a welding fixture according to any one of claims 1-17.

19. The welding device according to claim 18, wherein: The device body comprises: A mounting bracket, the mounting bracket being arranged on the work surface; A pressure nozzle, the pressure nozzle is arranged on the mounting bracket and is used for docking with the avoidance through hole; A dust removal component is used to pass the protective gas into the gas passage.

20. The welding apparatus according to claim 19, wherein: The mounting bracket is provided with a lifting assembly, and the lifting assembly is connected with the pressing nozzle to drive the pressing nozzle to move up and down.

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