Tab welding mechanism and battery assembling system

Abstract

The invention discloses a tab welding mechanism and a battery assembly system.The tab welding mechanism comprises a base, a supporting base, a tab pressing structure and a welding assembly, and the supporting base is arranged on the base and used for supporting and fixing a core body of a battery cell; the tab pressing structure is arranged on the base table and is configured to move towards the supporting seat so as to be used for pressing and collecting a plurality of tab pieces stacked on the battery cell; the welding assembly is arranged on the base table and is configured to move towards the supporting base so as to weld the multiple folded electrode lug pieces to form the electrode lug part. By means of the mode, the problem that the pole lug welding technology is high in difficulty can be solved, and the yield of batteries is increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a tab welding mechanism and a battery assembly system. Background Art

[0002] A battery is a cup, tank or other container or part of a composite container that contains an electrolyte solution and metal electrodes to generate an electric current. It is a device that can convert chemical energy into electrical energy. With the development of science and technology, batteries with advantages such as easy portability, simple and easy charging and discharging, and long-term stable power supply are widely used in the fields of automobiles, home appliances, aerospace, etc.

[0003] In the existing technology, when assembling the battery, the pole tabs connecting the positive and negative electrodes in the battery cell need to be welded and fixed to form the pole tabs to facilitate welding of the pole tabs to the poles. However, the welding process of the pole tabs is complicated, which makes the preparation of the battery more difficult and reduces the yield rate of the battery. Summary of the invention

[0004] In view of the above problems, the present application provides a tab welding mechanism and a battery assembly system, which can solve the problem of high difficulty in tab welding process and improve the yield rate of batteries.

[0005] In a first aspect, the present application provides a tab welding mechanism, which includes a base, a support seat, a tab pressing structure, and a welding assembly. The support seat is arranged on the base, and is used to support and fix the core body of the battery cell; the tab pressing structure is arranged on the base, and is configured to be able to move toward the support seat, so as to press and gather a plurality of tab sheets stacked on the battery cell; and the welding assembly is arranged on the base, and is configured to be able to move toward the support seat, so as to weld the gathered plurality of tab sheets to form a tab portion.

[0006] In the technical solution of the embodiment of the present application, not only a welding mechanism is provided on the base, but also a support seat and a tab pressing structure are provided. Such a design not only enables the tab welding mechanism to weld the tab sheets of the battery cell, but also allows the tab pressing structure to press and close the tab sheets before welding, thereby shortening the interval between the tab sheets to compact the tab sheets, facilitating the welding of the tabs, reducing the difficulty of welding, and improving the yield rate of the battery cell. The support seat can transport the battery cell to the position corresponding to the tab pressing structure or the welding assembly, so as to facilitate the pressing and welding of the tab sheets of the battery cell, and also facilitate the transportation of the battery cell to other locations after the tab sheets are pressed and welded to form the tab portion.

[0007] In some embodiments, the tab pressing structure includes a first component and a second component movably disposed on the base, respectively. The first component and the second component are configured to be relatively close to or far away from each other, and a clamping cavity can be formed when the first component and the second component are relatively close to each other, and the first component and the second component are used to clamp a plurality of tab sheets in the clamping cavity to press and gather the plurality of tab sheets.

[0008] By arranging the first component and the second component to cooperate with each other so as to be relatively close to or far away from each other, the pole ear pressing structure can confine the pole ear sheet in the clamping cavity and press and gather the pole ear sheet to compact the pole ear sheet, thereby facilitating subsequent welding of the pole ear sheet.

[0009] In some embodiments, the first component includes a first driving unit and a first pressing plate. The first driving unit is mounted on the base. The first driving unit is transmission-connected to the first pressing plate. The first driving unit is configured to drive the first pressing plate toward or away from the support seat.

[0010] By setting the first driving unit to drive the first pressing plate to move closer to or away from the support seat so as to move closer to or away from the core body of the battery cell on the support seat, it is convenient for the first pressing plate to press and retract the pole ear sheet on the battery cell, and it is also convenient for the first pressing plate to be driven by the first driving unit to move away from the pole ear part after pressing and retracting the pole ear sheet, so that the first pressing plate will not affect the movement of the battery cell.

[0011] In some embodiments, the second component includes a second driving unit and a second pressing plate, the second driving unit is mounted on the base, the second driving unit is in transmission connection with the second pressing plate, and the second driving unit is configured to drive the second pressing plate to move closer to or farther from the support seat. The first driving unit and the second driving unit are respectively located on both sides of the support seat, so that the first component and the second component can move closer to or farther from each other to form a clamping cavity with adjustable size.

[0012] By setting a second driving unit to drive the second pressing plate to move closer to or away from the support seat so as to move closer to or away from the core body of the battery cell on the support seat, so that the first component and the second component form a clamping cavity with adjustable size, the first pressing plate and the second pressing plate can cooperate to press and close the two side surfaces of multiple pole tabs of the battery cell, thereby compacting the multiple pole tabs.

[0013] In some embodiments, the welding assembly includes a support frame, a first welding unit and a second welding unit. The support frame is installed in transmission connection with the first driving unit, the first welding unit and the second welding unit are installed on the support frame, and the first welding unit and the second welding unit respectively weld the multiple pole tabs from both sides of the multiple pole tabs.

[0014] By installing the first welding unit and the second welding unit on the support frame, the first driving unit can drive the first welding unit and the second welding unit together to approach the pole tab. By using the two welding units to weld the two sides of the pole tab at the same time, the welding of the pole tab can be made more firm, thereby enhancing the welding effect of the pole tab and increasing the welding efficiency of the pole tab.

[0015] In some embodiments, the first welding unit includes a first welding head and a first driving component. The first driving component is mounted on the support frame. The first driving component is transmission-connected to the first welding head for driving the first welding head to move closer to or away from the support seat.

[0016] By setting the first driving component and the first welding head in transmission connection, the first welding head can be independently moved under the transmission of the first driving component, so that the first welding unit can adjust its position to align with one side of the plurality of pole tabs, thereby achieving precise welding.

[0017] In some embodiments, the first pressing plate has a first through hole for facing the second pressing plate, and the first driving component is configured to drive the end of the first welding head to enter the first through hole or move out of the first through hole. And / or, the first pressing plate further includes a blowing structure, and the air outlet of the blowing structure is arranged on the side of the first pressing plate facing the second pressing plate, and is used to smooth the tab by blowing air.

[0018] By setting the end of the first welding head to be able to enter and move out of the first through hole of the first pressing plate, the first welding head can weld multiple pole tabs after the first pressing plate gathers and compacts the multiple pole tabs, and during the welding process, the first pressing plate can fix the multiple pole tabs so that the pole tabs are not easily deformed, so as to facilitate the first welding head to weld one side of the multiple pole tabs. The blowing structure is provided to smooth the pole tabs by blowing air, which can further regularize the shape of the pole tabs.

[0019] In some embodiments, the second welding unit includes a second welding head and a second driving component, the second driving component is mounted on the support frame, and the second driving component is transmission-connected to the second welding head for driving the second welding head to move closer to or away from the support seat.

[0020] By setting a second driving component and a second welding head transmission connection, the second welding head can be independently moved under the transmission of the second driving component, so that the second welding unit can adjust its position to align with one side of the plurality of pole tabs, thereby achieving precise welding.

[0021] In some embodiments, the second pressing plate has a second through hole facing the first pressing plate, and the second driving component is configured to drive the end of the second welding head to enter the second through hole or move out of the second through hole.

[0022] By setting that the end of the second welding head can enter and move out of the second through hole of the second pressing plate, the second welding head can weld a plurality of tab pieces after the second pressing plate folds and compacts the plurality of tab pieces. And during the welding process, the second pressing plate can fix the plurality of tab pieces, so that the tab pieces are not easily deformed, facilitating the second welding head to weld one side of the plurality of tab pieces.

[0023] In some embodiments, the welding assembly further includes a first dust suction unit and a second dust suction unit, and the first dust suction unit and the second dust suction unit are respectively used for sucking dust from the welding areas of the first welding unit and the second welding unit.

[0024] By providing the first dust suction unit and the second dust suction unit respectively for the welding areas of the first welding unit and the second welding unit, the debris and dust generated in the welding areas can be absorbed, so that the debris and dust are not easily adsorbed on the tab portion, affecting the use of the tab portion and subsequent processing procedures.

[0025] In some embodiments, the first driving unit is configured to drive the first pressing plate in three-dimensional directions.

[0026] By configuring the first pressing plate to be movable in three directions in three dimensions, it is convenient for the first pressing plate to accurately position the tab pieces, and then press and fold the tab pieces.

[0027] In some embodiments, the first driving unit includes a first driving component, a second driving component, and a third driving component. The first driving component is in transmission connection with the first pressing plate and is used for driving the first pressing plate to move along a first direction. The second driving component is in transmission connection with the first driving component and is used for driving the first driving component to move in a second direction. The third driving component is in transmission connection with the second driving component and is used for driving the second driving component to move along a third direction to approach or move away from the support seat. Among them, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0028] By arranging different driving components in different directions and connecting the different driving components in sequence, the movement linkage between the three driving components can be realized, and it can be simply realized to drive the first pressing plate to move in three directions.

[0029] In some embodiments, the second pressing plate includes a first mating surface, a second mating surface, and a third mating surface. The second mating surface is arranged at an obtuse angle with the first mating surface, and the third mating surface is bent relative to the second mating surface. The first mating surface is used for pressing on the core body of the battery cell, the second mating surface is used for covering a part of the end face of the battery cell provided with tab pieces, and the third mating surface is used for pressing the plurality of tab pieces on the first pressing plate.

[0030] By setting three matching surfaces on the second pressing plate that are adapted to the core body of the battery cell and the multiple pole tabs, the second pressing plate can be conveniently positioned to correspond to the multiple pole tabs according to the core body of the battery cell, so as to more effectively press and close the multiple pole tabs.

[0031] In some embodiments, the support base includes a conveying track and a battery cell jig, the battery cell jig is installed on the conveying track, and the conveying track is used to convey the battery cell jig to the tab pressing structure and convey the battery cell jig away from the tab pressing structure. The battery cell jig is configured to support and fix the core body of the battery cell.

[0032] By setting up a conveying track and a battery cell fixture, the battery cell can be easily fixed on the conveying track so that the battery cell is not easily displaced and dropped. It is also convenient to convey the battery cell to the welding station corresponding to the pole ear welding mechanism, thereby facilitating the welding of the pole ear sheet.

[0033] In a second aspect, the present application provides a battery assembly system, which includes the tab welding mechanism in the above-mentioned embodiment.

[0034] In some embodiments, the battery includes a shell, a bottom cover and a battery cell. The shell has an open end, and a pole is provided on the wall of the shell opposite to the open end, the pole has a through hole, and the shell and the bottom cover are connected to form a receiving cavity connected to the through hole. The active material coating portion of the battery cell is arranged in the shell, and the pole ear portion of the battery cell is connected to the side of the pole away from the receiving cavity through the through hole. The battery assembly system also includes a conveying device and an assembly device, and the conveying device is used to convey the structure to be assembled to each station of the assembly equipment. The station of the assembly equipment includes at least a pole ear welding mechanism. Among them, the pole ear welding mechanism is used to weld multiple pole ear sheets of the battery cell to form a pole ear portion.

[0035] By providing a tab welding mechanism in the battery assembly system, multiple tabs of the battery cell can be welded to form a tab portion, thereby facilitating the welding of the tabs, reducing the difficulty of welding, and improving the yield rate of the battery.

[0036] In some embodiments, the workstation of the assembly equipment further includes a shell insertion device, a pole ear insertion device, a pole welding device and a bottom cover welding device. Among them, the conveying device is used to convey the battery cell with the pole ear portion to the shell insertion device, the pole ear insertion device, the pole welding device and the bottom cover welding device in sequence. Among them, the shell insertion device is used to load the battery cell into the housing from the open end. The pole ear insertion device is used to clamp the pole ear portion through the through hole when the battery cell is loaded into the housing. The pole welding device is used to weld the pole ear portion passing through the through hole to the side of the pole away from the accommodating cavity. The bottom cover welding device is used to weld the bottom cover to the open end of the housing.

[0037] By setting a case - inserting device, a pole - ear threading device, a pole - column welding device, and a bottom - cover welding device in the battery assembly system, the process of assembling batteries in the battery assembly system can be made smoother, the battery assembly process can be simplified, and the standardization and intelligence of the battery assembly process can be improved.

[0038] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of this application more obvious and understandable, the following specifically presents the specific implementation manners of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0040] Figure 1 is a schematic structural diagram of a battery cell in some embodiments of this application;

[0041] Figure 2 is a partial structural diagram of a pole - ear welding mechanism in some embodiments of this application;

[0042] Figure 3 is Figure 2 another perspective schematic diagram of a part of the structure of the pole - ear welding mechanism embodiment shown;

[0043] Figure 4 is Figure 2 an enlarged schematic diagram of the O region of the pole - ear welding mechanism embodiment shown;

[0044] Figure 5 is Figure 3 an enlarged schematic diagram of the P region of the pole - ear welding mechanism embodiment shown;

[0045] Figure 6 is another partial structural diagram of a pole - ear welding mechanism in some embodiments of this application;

[0046] Figure 7 is a schematic structural diagram of a second component in a pole - ear welding mechanism in some embodiments of this application;

[0047] Figure 8 is a schematic structural diagram of a partial region in a pole - ear welding mechanism in some other embodiments of this application;

[0048] Figure 9 is Figure 8 a side - view structural schematic diagram of a second pressing plate in the pole - ear welding mechanism embodiment shown;

[0049] Figure 10 Schematic diagram of the overall structure of the tab welding mechanism according to some embodiments of the present application;

[0050] Figure 11 Schematic diagram of the structure of the first driving unit in the tab welding mechanism according to some embodiments of the present application;

[0051] Figure 12 Schematic diagram of the structure of the support base in the tab welding mechanism according to some embodiments of the present application;

[0052] Figure 13 Schematic block diagram of the structure of the battery assembly system according to some embodiments of the present application.

[0053] The reference numerals in the specific embodiments are as follows:

[0054] Battery 1, housing 10a, battery core 20a, accommodation cavity 11a, through hole 14a, tab 21a, pole column 15a, open end 12a, bottom cover 30a, core body 22a;

[0055] Tab welding mechanism 10, base 11, support base 100, tab pressing structure 200, welding assembly 300, first assembly 210, second assembly 220, first driving unit 211, first pressing plate 212, first motor 2111, first reduction gear 2112, first lead screw 2113, first floating joint 2114, second driving unit 221, second pressing plate 222, clamping cavity 201, cylinder 2211, support frame 310, first welding unit 320, second welding unit 330, first welding head 321, first driving member 322, first through hole 2224, first cylinder 3221, blowing structure 2121, air outlet 2122. Second welding head 331, second driving member 332, second cylinder 3321, second through hole 2123, first dust suction unit 340, second dust suction unit 350, first dust suction port 341, second dust suction port 351, first driving assembly 202, second driving assembly 203, third driving assembly 204, second motor 2115, second lead screw 2116, third motor 2117, third lead screw 2118, first linear slide rail 360, second linear slide rail 370, third linear slide rail 380, first mating surface 2221, second mating surface 2222, third mating surface 2223, conveying track 110, battery core fixture 120, up and down driving module 130, horizontal driving module 140;

[0056] Battery assembly system 20, conveying equipment 21, assembly equipment 22, conveying line 23, housing inserting device 24, tab threading device 25, pole column welding device 26 and bottom cover welding device 27. Specific embodiments

[0057] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill 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" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0060] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0062] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0063] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0065] With the development of battery technology, battery cells are applied in more and more fields and gradually replace traditional fossil energy in the field of automotive power. A battery cell can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery cell, the active material can be activated by charging after discharge and continue to be used.

[0066] In the existing technology, during battery assembly, it is necessary to weld and fix the tabs that lead out the positive and negative electrodes of the battery cells to form tab portions, so as to facilitate the welding of the tab portions to the electrode posts. However, the tab welding process is complex, which makes the preparation of the battery difficult and reduces the yield of the battery. Especially when multiple electrode assemblies are stacked to form a battery cell, it is necessary to weld the tabs of multiple battery cells together. However, the tabs of multiple electrode assemblies are prone to having too large gaps, resulting in insecure welding.

[0067] In order to simplify the tab welding process, improve the welding efficiency and the yield of the battery, the battery cell can be positioned before welding to fix the tabs, and the tabs can be pressed and compacted to form tab portions before welding, and then the tab portions and the electrode posts are welded.

[0068] Based on the above considerations, the present application provides an ear welding mechanism and a battery assembly system. The ear welding mechanism includes a base, a support seat, an ear pressing structure, and a welding assembly. The support seat is disposed on the base and is used to support and fix the core body of the battery cell. The ear pressing structure is disposed on the base and is configured to be able to move toward the support seat to press and gather multiple ear pieces of the stacked battery cell. The welding assembly is disposed on the base and is configured to be able to move toward the support seat to weld the gathered multiple ear pieces to form an ear part.

[0069] In the technical solution of the embodiment of the present application, not only a welding mechanism is provided on the base of the ear welding mechanism, but also a support seat and an ear pressing structure are provided. Such a design enables the ear welding mechanism to not only weld the ear pieces of the battery cell, but also press and gather the ear pieces before welding, so as to shorten the interval between the ear pieces to compact the ear pieces, facilitate the welding of the ear pieces, thereby reducing the welding difficulty and improving the yield rate of the battery cell. And the support seat can transport the battery cell to the corresponding position of the ear pressing structure or the welding assembly, so as to facilitate the pressing and welding of the ear pieces of the battery cell to form an ear part, and also facilitate transporting the battery cell to other positions after the ears are pressed and welded.

[0070] The following exemplarily describes the battery 1.

[0071] As Figure 1 shown, the battery 1 (Battery) refers to a cup, tank, or other container or part of the space of a composite container containing an electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy. The battery 1 can be a battery pack or an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0072] In some embodiments, the battery 1 may include a housing 10a, a bottom cover 30a, and a battery cell 20a. Of course, the battery 1 may also have other functional components.

[0073] Specifically, the housing 10a may have an open end 12a, and a pole post 15a may be provided on the wall of the housing 10a opposite to the open end 12a. The pole post 15a may have a through hole 14a, and the housing 10a and the bottom cover 30a are connected to form a receiving cavity 11a communicating with the through hole 14a. The active material coating portion of the battery cell 20a is disposed inside the housing 10a, and the ear part 21a of the battery cell 20a passes through the through hole 14a and is connected to the side of the pole post 15a away from the receiving cavity 11a.

[0074] In some embodiments, the housing 10a is used to encapsulate the battery cell 20a and other components such as the electrolyte.

[0075] The battery cell 20a is the component in the battery 1 where the electrochemical reaction occurs. The battery cell 20a can also be referred to as an electrode assembly. The housing 10a can contain one or more battery cells 20a. One end of the battery cell 20a can be provided with a tab 21a, and the battery cell 20a is located in the accommodation cavity 11a and the tab 21a penetrates into the through hole 14a.

[0076] Optionally, the battery 1 can further include a bottom cover 30a, and the bottom cover 30a is used to cover the open end 12a so that the battery cell 20a is not easily dropped from the open end 12a after being put into the housing.

[0077] The bottom cover 30a can be a component that covers the open end 12a of the housing 10a to isolate the internal environment of the battery 1 from the external environment. Without limitation, the shape of the bottom cover 30a can be adapted to the shape of the open end 12a to cooperate with the housing 10a. Optionally, the bottom cover 30a can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the bottom cover 30a is not easily deformed when being squeezed or collided, enabling the battery 1 to have higher structural strength and improved safety performance.

[0078] The terminal post 15a can be provided on the top 13a of the housing 10a. The terminal post 15a can be used to electrically connect to the battery cell 20a for outputting or inputting the electrical energy of the battery 1. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery 1 reaches a threshold can also be provided on the housing 10a.

[0079] The housing 10a is a component for cooperating with the bottom cover 30a to form the internal environment of the battery 1. Among them, the formed internal environment can be used to accommodate the battery cell 20a, the electrolyte, and other components. The housing 10a and the bottom cover 30a can be independent components. An open end 12a can be provided on the housing 10a, and the bottom cover 30a covers the open end 12a at the open end 12a to form the internal environment of the battery 1. In other embodiments, the shape of the housing 10a can be determined according to the specific shape and size of the battery cell 20a. The material of the housing 10a can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0080] In some embodiments, the battery cell 20a is provided with a tab 21a and a core body 22a, and the tab 21a can conduct the current out of the core body 22a. The tab 21a includes a positive tab and a negative tab. The positive tab and the negative tab can be located at one end of the core body 22a together or at both ends of the core body 22a respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 21a connects to the terminal post 15a to form a current loop.

[0081] Optionally, the tab portion 21a can be formed by welding a plurality of tab pieces 211a. Among them, the plurality of tab pieces 211a can be copper thin sheets or aluminum thin sheets corresponding to the positive tab or the negative tab. Of course, in other embodiments, the tab pieces 211a can also be made of metal materials such as silver thin sheets and nickel thin sheets.

[0082] In some embodiments, the core 22a includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 20a, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0083] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0084] As an example, the positive current collector has two surfaces opposite to each other in its own thickness direction, and the positive active material is disposed on any one or both of the two opposite surfaces of the positive current collector.

[0085] As an example, the positive current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0086] As an example, the positive active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive active material of the battery 1 can also be used. These positive active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates can include but are not limited to lithium iron phosphate (such as LiFePO 4 (which can also be abbreviated as LFP)), composites of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), composites of lithium manganese phosphate and carbon, lithium manganese iron phosphate, composites of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides can include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4) Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which can also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which can also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O 2 (which can also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0087] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0088] As an example, the negative electrode current collector can be a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0090] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0091] As an example, the negative electrode active material can be the negative electrode active material known in the art for the battery cell 20a. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0092] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0093] In some embodiments, the core 22a further includes a separator disposed between the positive electrode and the negative electrode.

[0094] In some embodiments, the separator is a separator membrane. The present application has no particular limitation on the type of the separator membrane, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0095] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes or attached to the surfaces of the positive and negative electrodes.

[0096] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0097] In some embodiments, the battery cell 20a further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The present application has no specific limitation on the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0098] Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0099] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0100] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0101] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0102] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0103] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, poly(ionic liquid)-lithium salt, cellulose, etc.

[0104] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0105] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0106] In some embodiments, the core 22a has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure. In some other embodiments, the core 22a may also have a stacked structure, that is, a stacked structure formed by stacking the positive electrode sheet and the negative electrode sheet.

[0107] This application provides an ear welding mechanism 10, which can be used to weld the ear pieces 211a of the battery cell 20a. Exemplarily, the welding process is pre-welding, and the ultrasonic welding process is correspondingly adopted.

[0108] As Figure 2 and Figure 5 shown, the ear welding mechanism 10 may include a base 11, a support seat 100, an ear pressing structure 200, and a welding assembly 300.

[0109] Among them, the support seat 100 may be arranged on the base 11 for supporting and fixing the core body 22a of the battery cell 20a. The ear pressing structure 200 may be arranged on the base 11 and is configured to be able to move towards the support seat 100 for pressing and gathering the stacked multiple ear pieces 211a of the battery cell 20a. The welding assembly 300 may be arranged on the base 11 and is configured to be able to move towards the support seat 100 to weld the gathered multiple ear pieces 211a to form an ear part 21a.

[0110] Optionally, the setting position of the ear pressing structure 200 on the base 11 and the setting position of the welding assembly 300 on the base 11 may correspond to the position of the support seat 100. When the support seat 100 transports the core body 22a of the battery cell 20a to the position corresponding to the ear pressing structure 200, the ear pressing structure 200 can move towards the ear pieces 211a of the battery cell 20a on the support seat 100 and is used to press and gather the ear pieces 211a of the battery cell 20a. The welding assembly 300 can weld the ear pieces 211a, so that a pressing and welding station can be formed at the positions corresponding to the ear pressing structure 200 and the welding assembly 300 of the support seat 100.

[0111] Such a setting can facilitate the support seat 100 to transport the battery cell 20a to the pressing and welding station corresponding to the ear pressing structure 200 or the welding assembly 300, so as to facilitate the pressing and welding of the ear pieces 211a of the battery cell 20a. After the ear pieces 211a are pressed and welded to form the ear part 21a, it is also convenient to transport the battery cell 20a to other positions.

[0112] Since the ear pieces 211a of the battery cell 20a are formed by laminating the metal lead-out pieces of the negative electrode and the positive electrode in the battery cell 20a, setting both the ear pressing structure 200 and the welding assembly 300 at the same position not only enables the ear welding mechanism 10 to weld the ear pieces 211a of the battery cell 20a, but also facilitates the pressing and gathering of the ear pieces 211a before welding, thereby shortening the interval between the ear pieces 211a to compact the ear pieces 211a, facilitating the welding of the ear pieces 211a, reducing the welding difficulty, and improving the yield rate of the battery cell 20a.

[0113] In some embodiments of this application, such asFigure 2 as well as Figure 5 As shown, the tab pressing structure 200 may include a first component 210 and a second component 220 respectively movably disposed on the base 11. The first component 210 and the second component 220 may be configured to be relatively close or far away. When the first component 210 and the second component 220 are relatively close, a clamping cavity 201 can be formed, and the first component 210 and the second component 220 are used to clamp a plurality of tab sheets 211a in the clamping cavity 201 to press and gather the plurality of tab sheets 211a.

[0114] Optionally, the first component 210 and the second component 220 can move closer or farther relative to each other in a preset movement direction. When the pole tab 211a is transported to the press welding station position by the support seat 100, the pole tab 211a can be located between the first component 210 and the second component 220 in the preset movement direction, and at this time, one side of the pole tab 21a can face the first component 210, and the other side of the pole tab 21a can face the second component 220. The preset movement direction can be shown by arrow A in the figure.

[0115] When the first component 210 and the second component 220 are relatively close to each other, a clamping cavity 201 is formed, and multiple pole tabs 211a are in the clamping cavity 201. The first component 210 and the second component 220 cooperate with each other to clamp the multiple pole tabs 211a when they are gradually relatively close to each other, so as to press and gather the multiple pole tabs 211a.

[0116] Through the above arrangement, the first component 210 and the second component 220 can be relatively close to or far away from each other, which can facilitate the pole ear pressing structure 200 to confine the pole ear sheet 211a in the clamping cavity 201 and press and gather the pole ear sheet 211a to compact the pole ear sheet 211a, thereby facilitating subsequent welding of the pole ear sheet 211a.

[0117] In some embodiments of the present application, Figures 2 to 4 As shown, the first component 210 may include a first driving unit 211 and a first pressing plate 212. The first driving unit 211 may be installed on the base 11. The first driving unit 211 may be transmission-connected to the first pressing plate 212. The first driving unit 211 may be configured to drive the first pressing plate 212 toward or away from the support seat 100.

[0118] By setting the first driving unit 211 to drive the first pressing plate 212 to approach or move away from the support base 100 so as to approach or move away from the core body 22a of the battery cell 20a on the support base 100, it is convenient for the first pressing plate 212 to press and gather the tab 211a on the core body 22a, and it is also convenient to use the first driving unit 211 to drive the first pressing plate 212 away from the tab 211a after compacting the tab 211a, so that the first pressing plate 212 does not affect the movement and transportation of the battery 1.

[0119] Optionally, as Figure 6 shown, the first driving unit 211 may include a first motor 2111, a first speed reducer 2112, a first lead screw 2113, and a first floating joint 2114. Among them, the first speed reducer 2112 may be connected to the first motor 2111, the first lead screw 2113 is connected to the first speed reducer 2112, and the first floating joint 2114 is connected to the first lead screw 2113.

[0120] Specifically, the first motor 2111 is a power supply device for supplying electrical energy to other components of the first driving unit 211. The first speed reducer 2112 is a speed reduction transmission device for matching the rotational speed and transmitting torque between the first motor 2111 and the first lead screw 2113. The first lead screw 2113 is a motion mechanism that can transmit linear motion, enabling the first driving unit 211 to drive the first pressing plate 212 to move away from or close to the tab 211a. The first floating joint 2114 is used to connect the first lead screw 2113 and the first pressing plate 212, enabling the first lead screw 2113 to drive the first pressing plate 212 to move.

[0121] Through the above settings, the first driving unit 211 is configured as a lead screw drive, which can enable the first driving unit 211 to drive the first pressing plate 212 more quickly and make the movement of the first pressing plate 212 more accurate, so that the first pressing plate 212 can be aligned with the tab 211a, and the tab pressing structure 200 can quickly and accurately complete the process of pressing and gathering the tab 211a.

[0122] In some embodiments of the present application, as Figures 2 to 7 shown, the second assembly 220 may include a second driving unit 221 and a second pressing plate 222. The second driving unit 221 may be installed on the base 11, and the second driving unit 221 may be configured to drive the second pressing plate 222 to approach or move away from the support base 100 so as to approach or move away from the battery cell 20a on the support base 100.

[0123] The first driving unit 211 and the second driving unit 221 are respectively located on two sides of the support base 100 , so that the first component 210 and the second component 220 can be relatively close to or far away from each other to form a clamping cavity 201 with adjustable size.

[0124] For example, when the first driving unit 211 and the second driving unit 221 drive the first component 210 and the second component 220 to gradually approach each other, the size of the clamping cavity 201 becomes smaller and smaller, and the first component 210 and the second component 220 further clamp and gather the pole tab 211a in the clamping cavity 201. After the pole tab 211a is compacted, the first component 210 and the second component 220 move away from each other, and the size of the clamping cavity 201 becomes larger and larger.

[0125] By arranging the first driving unit 211 and the second driving unit 221 as described above, the first assembly 210 and the second assembly 220 are driven to approach each other and cooperate with each other to press and gather the pole tab 211 a, thereby improving the compaction effect of the pole tab 211 a.

[0126] Alternatively, if Figure 2 and Figure 7 As shown, the second driving unit 221 may include a cylinder 2211, and the cylinder 2211 is connected to the second pressing plate 222, wherein the cylinder 2211 refers to a cylindrical part that guides the piston to perform linear reciprocating motion in the cylinder, so the cylinder 2211 is connected to the second pressing plate 222, and the cylinder 2211 can drive the second pressing plate 222 to perform linear reciprocating motion close to or away from the support seat 100, thereby realizing the pressing and shaping of the pole ear piece 211a. The cylinder 2211 has the characteristics of simple structure and low cost, is good at driving other components to perform reciprocating linear motion, and is particularly suitable for parallel transportation of products and workpieces. Therefore, the use of the cylinder 2211 can make the pressing and gathering process of the pole ear piece 211a standardized and systematized, and can also reduce the cost of the pole ear pressing structure 200 and improve the reliability of the pole ear pressing structure 200.

[0127] In some embodiments of the present application, Figures 2 to 5 As shown, the welding assembly 300 may include a support frame 310, a first welding unit 320 and a second welding unit 330. The support frame 310 may be transmission-connected to the first driving unit 211, and the first welding unit 320 and the second welding unit 330 may be mounted on the support frame 310. The first welding unit 320 and the second welding unit 330 respectively weld the plurality of pole tabs 211a from both sides of the plurality of pole tabs 211a.

[0128] Specifically, the first driving unit 211 may drive the first welding unit 320 and the second welding unit 330 to move by driving the supporting frame 310 .

[0129] By mounting the first welding unit 320 and the second welding unit 330 on the support frame 310, the first driving unit 211 can drive the first welding unit 320 and the second welding unit 330 to approach the tab 211a together.

[0130] Optionally, when the support base 100 transports the battery cell 20a to the pressing and welding station corresponding to the tab pressing structure 200 and the welding assembly 300, multiple tabs 211a of the battery cell 20a can be located between the first welding unit 320 and the second welding unit 330, so that the first welding unit 320 and the second welding unit 330 can weld the two sides of multiple tabs 211a simultaneously, making the welding of multiple tabs 211a more firm, thus enhancing the welding effect of multiple tabs 211a and also increasing the welding efficiency of multiple tabs 211a.

[0131] In some embodiments of the present application, as Figures 2 to 4 shown, the first welding unit 320 may include a first welding head 321 and a first driving member 322. The first driving member 322 can be mounted on the support frame 310. The first driving member 322 is in transmission connection with the first welding head 321. The first driving member 322 can be used to drive the first welding head 321 to approach or move away from the support base 100, so as to be able to approach or move away from the battery cell 20a on the support base 100.

[0132] Specifically, during the welding process of the tab 21a, the first driving member 322 drives the support frame 310 to drive the first welding unit 320 to approach multiple tabs 211a. At the same time, the first driving member 322 can be used to drive and adjust the position of the first welding head 321, so that the first welding head 321 can accurately align with multiple tabs 211a, thereby welding multiple tabs 211a to improve the welding effect and efficiency of the welding assembly 300.

[0133] Optionally, as Figures 2 to 4 shown, the first driving member 322 may include a first air cylinder 3221. The first air cylinder 3221 is connected to the first welding head 321 and can drive the first welding head 321 to move relative to the tab 21a, so that the first welding head 321 can align with multiple tabs 211a and weld multiple tabs 211a.

[0134] By setting the first driving member 322 in transmission connection with the first welding head 321, the first welding head 321 can be driven to move independently under the transmission of the first driving member 322, so that the first welding unit 320 can adjust its position to align with one side of multiple tabs 211a, thereby achieving precise welding.

[0135] In some embodiments, the welding assembly 300 may include, but is not limited to, an ultrasonic welding device, a laser welding device, an arc welding device, or an aluminothermic welding device, etc. The welding assembly 300 may emit ultrasonic, laser, arc, or other energy through the first welding head 321 and the second welding head 331 to weld the plurality of pole tabs 211a, so that the plurality of pole tabs 211a are sequentially welded to form the pole tab portion 21a.

[0136] In some embodiments of the present application, Figure 4 As shown, the first pressing plate 212 may have a first through hole 2224 for accommodating the second pressing plate 222 , and the first driving component 322 may be configured to drive the end of the first welding head 321 to enter the first through hole 2224 or move out of the first through hole 2224 .

[0137] In some embodiments, the first pressing plate 212 may further include a blowing structure 2121 , wherein an air outlet 2122 of the blowing structure 2121 is disposed on a side of the first pressing plate 212 facing the second pressing plate 222 , and is used to smooth the tab 211 a by blowing air.

[0138] Optionally, the first through hole 2224 in the first pressing plate 212 may correspond to the position of the pole tab 211a of the battery cell 20a, so that the first welding head 321 can align with the multiple pole tabs 211a after entering the first through hole 2224 to achieve precise welding of the multiple pole tabs 211a.

[0139] Optionally, the blowing structure 2121 may include an air outlet 2122, and wind may be blown out from the air outlet 2122. The air outlet 2122 may be disposed at the end of the first welding head 321, and perpendicular to the preset movement direction A, the air outlet 2122 may be closer to the battery cell 20a than the first welding head 321.

[0140] The air outlet 2122 may be disposed at a position corresponding to the root of the pole tab 211a, so that wind can be blown out from the air outlet 2122 and smooth the pole tab 211a from the root of the pole tab 211a, thereby further regularizing the overall shape of the pole tab 211a.

[0141] In some embodiments of the present application, Figures 2 to 5 As shown, the second welding unit 330 may include a second welding head 331 and a second driving component 332 , the second driving component 332 is transmission-connected to the second welding head 331 , and the second driving component 332 may be used to drive the second welding head 331 to approach or move away from the support seat 100 .

[0142] Optionally, the second driving component 332 can be mounted on the support frame 310, so that when the first driving unit 211 drives the support frame 310, it can drive the second welding head 331 and the second driving component 332 to approach the plurality of tab pieces 211a together. Then, the second driving component 332 can drive the second welding head 331 to approach and align with the plurality of tab pieces 211a to weld the plurality of tab pieces 211a. After welding is completed, the second driving component 332 can drive the second welding head 331 away from the plurality of tab pieces 211a, so as not to affect the subsequent transportation of the battery cell 20a.

[0143] Optionally, the second driving component 332 can include a second air cylinder 3321. The second air cylinder 3321 is connected to the second welding head 331 and can drive the second welding head 331 to move relative to the plurality of tab pieces 211a, so that the second welding head 331 can align with the plurality of tab pieces 211a and weld the plurality of tab pieces 211a.

[0144] In different embodiments, the second pressing plate 222 can be provided with different shapes.

[0145] For example, in some embodiments, as Figure 5 shown, the middle part of the second pressing plate 222 close to the plurality of tab pieces 211a can be higher than the parts on both sides and away from the first pressing plate 212 along the preset movement direction A, so that the part of the second pressing plate 222 close to the plurality of tab pieces 211a presents a "U" shape. When the second pressing plate 222 presses the plurality of tab pieces 211a, the middle part can contact and press the tab pieces 211a, and the parts on both sides can gather the roots of the plurality of tab pieces 211a to regularize the shapes of the plurality of tab pieces 211a from both sides.

[0146] In some other embodiments of the present application, as Figure 8 shown, the second pressing plate 222 can be configured such that the end portion thereof close to the plurality of tab pieces 211a extends in the direction of the welding assembly 300 to be bent to form a pressing portion for pressing and gathering the plurality of tab pieces 211a.

[0147] Optionally, the second pressing plate 222 has a second through hole 2123 for facing the first pressing plate 212. The second driving component 332 is configured to drive the end portion of the second welding head 331 to enter or move out of the second through hole 2123.

[0148] Optionally, the second through hole 2123 in the second pressing plate 222 corresponds to one side of the plurality of tab pieces 211a, so that the second welding head 331 can correspond to one side surface of the plurality of tab pieces 211a when entering the second through hole 2123 and weld the plurality of tab pieces 211a.

[0149] Through the above arrangement, after the second pressing plate 222 presses and gathers the plurality of pole tabs 211a, the second driving component 332 can be used to drive the second welding head 331 to enter the second through hole 2123, so that after the plurality of pole tabs 211a are shaped, the plurality of pole tabs 211a can be welded by the second welding head 331. In the welding process, the second pressing plate 222 can continuously press the plurality of pole tabs 211a so that the plurality of pole tabs 211a are not easily deformed, thereby improving the welding effect of the plurality of pole tabs 211a.

[0150] In some embodiments of the present application, Figure 8 as well as Figure 9 As shown, the second pressing plate 222 may include a first mating surface 2221, a second mating surface 2222 and a third mating surface 2223. The second mating surface 2222 and the first mating surface 2221 may be arranged at an obtuse angle, and the third mating surface 2223 may be arranged to be bent relative to the second mating surface 2222. The first mating surface 2221 may be used to press on the core 22a of the battery cell 20a, the second mating surface 2222 may be used to cover a portion of the end surface of the core 22a provided with the pole tab 211a, and the third mating surface 2223 may be used to press the plurality of pole tabs 211a on the first pressing plate 212.

[0151] Optionally, the first mating surface 2221, the second mating surface 2222 and the third mating surface 2223 can be adapted to the shape of the core body 22a of the battery cell 20a and the positions of the multiple pole tabs 211a, so as to facilitate the second pressing plate 222 to position the corresponding multiple pole tabs 211a according to the core body 22a of the battery cell 20a, so as to press the multiple pole tabs 211a more effectively.

[0152] Optionally, the first mating surface 2221 may be perpendicular to the preset movement direction A, the second mating surface 2222 may be arranged at an obtuse angle to the first mating surface 2221, and the angle formed by the second mating surface 2222 and the first mating surface 2221 may be as follows: Figure 9 As shown in the angle α, 90°<α<180°. In other words, in the preset movement direction A, the second matching surface 2222 can be inclined.

[0153] With such arrangement, when the second pressing plate 222 approaches the battery cell 20a, if the positions of the battery cell 20a and the second pressing plate 222 are not aligned, the inclined second mating surface 2222 can guide the battery cell 20a or the second pressing plate 222 to adjust the position, so that the first mating surface 2221 of the second pressing plate 222 can accurately press the core 22a of the battery cell 20a, and the third mating surface 2223 can press and gather multiple pole tabs 21a.

[0154] In some embodiments of the present application,Figures 4 to 5 As shown, the welding assembly 300 may further include a first dust suction unit 340 and a second dust suction unit 350. The first dust suction unit 340 and the second dust suction unit 350 are respectively used to suck dust from the welding areas of the first welding unit 320 and the second welding unit 330.

[0155] Among them, the welding area refers to the area that can be affected by the welding head during use, which is the area that can be covered by the energy such as heat energy and ultrasonic waves emitted by the welding head. Within this welding area, multiple tab pieces 211a can be welded together. Therefore, sucking dust from the welding areas of the first welding unit 320 and the second welding unit 330 can reduce the occurrence of other metal impurities or tab debris fusing with multiple tab pieces 211a within the welding area, thereby improving the welding effect of each tab piece 211a.

[0156] Optionally, the first dust suction unit 340 may also be provided with a first dust suction port 341. The first dust suction port 341 may be disposed within the first through hole 2224 of the first pressing plate 212. The first welding head 321 may be disposed on the side of the first dust suction port 341 close to the battery cell 20a. Among them, the projected area of the first dust suction port 341 in the preset movement direction A may be larger than that of the second welding head 331, so that there is a dust suction channel in addition to the space for accommodating the first welding head 321 in the first dust suction port 341, facilitating the dust suction channel to suck dust from the welding area of the first welding unit 320 when the first welding head 321 welds the tab 21a.

[0157] Optionally, the second dust suction unit 350 may be provided with a second dust suction port 351. The second welding head 331 may be disposed on the side of the second dust suction port 351 close to the battery cell 20a. The projected area of the second dust suction port 351 in the preset movement direction A may be larger than that of the second welding head 331, so that there is a dust suction channel in addition to the space for accommodating the second welding head 331 in the second dust suction port 351, facilitating the dust suction channel to suck dust from the welding area of the second welding unit 330 when the second welding head 331 welds the tab 21a.

[0158] By providing the first dust suction unit 340 and the second dust suction unit 350 respectively for the welding areas of the first welding unit 320 and the second welding unit 330, the debris dust generated in the welding area can be absorbed, so that the debris dust is not easily adsorbed on multiple tab pieces 211a to affect the formation of the tab portion 21a.

[0159] In some embodiments of the present application, as Figures 10 to 11 shown, the first driving unit 211 may be configured to drive the first pressing plate 212 in three-dimensional directions. Optionally, the first driving unit 211 may also drive the support frame 310 in three-dimensional directions simultaneously.

[0160] Optionally, the first pressing plate 212 may be disposed on the support frame 310, and the first driving unit 211 may drive the first pressing plate 212 to move by driving the support frame 310.

[0161] Optionally, one of the three-dimensional directions may be a preset movement direction A, so that the support frame 310 can move up and down in the preset movement direction A to approach the battery cell 20a. The other two directions of the three-dimensional directions may be perpendicular to the preset movement direction A, and the two perpendicular directions are also perpendicular to each other, so that the first driving unit 211 can drive the support frame 310 to move left and right or back and forth to approach or move away from the battery cell 20a, so as to facilitate the welding assembly 300 and the first pressing plate 212 to align with the tab 21a of the battery cell 20a, and accurately press and weld the tab 21a.

[0162] In some embodiments, as Figures 10 to 11 shown, the first driving unit 211 may include a first driving component 202, a second driving component 203, and a third driving component 204. The first driving component 202 is in transmission connection with the first pressing plate 212 and is used to drive the first pressing plate 212 to move in a first direction. The second driving component 203 is in transmission connection with the first driving component 202 and is used to drive the first driving component 202 to move in a second direction. The third driving component 204 is in transmission connection with the second driving component 203 and is used to drive the second driving component 203 to move in a third direction to approach or move away from the support base 100. Among them, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0163] In as Figures 10 to 11 shown, the third direction, the second direction, and the first direction may respectively correspond to Figure 10 and Figure 11 the X, Y, and Z directions shown in

[0164] Optionally, the first motor 2111, the first speed reducer 2112, the first lead screw 2113, and the first floating joint 2114 in the above embodiments may all be disposed in the first driving component 202.

[0165] Optionally, the second driving component 203 may include a second motor 2115 and a second lead screw 2116, and the third driving component 204 may include a third motor 2117 and a third lead screw 2118.

[0166] Among them, the second motor 2115 can be connected to the second lead screw 2116, and the second motor 2115 can be used to supply electrical energy to the second lead screw 2116. The second lead screw 2116 can be connected to the support frame 310 and can be used to drive the first driving assembly 202 to perform a reciprocating linear motion in a second direction Y perpendicular to the first direction Z.

[0167] The third motor 2117 can be connected to the third lead screw 2118. The third motor 2117 can be used to supply electrical energy to the third lead screw 2118. The third lead screw 2118 can be connected to the support frame 310 and can be used to drive the second driving assembly 203 to perform a reciprocating linear motion in a third direction X perpendicular to the first direction Z and the second direction Y.

[0168] Optionally, as Figure 6 and Figure 11 shown, a first linear slide rail 360, a second linear slide rail 370, and a third linear slide rail 380 can be provided between the support frame 310 and the first driving unit 211. The first linear slide rail 360 can limit the movement of the support frame 310 in the Z direction, the second linear slide rail 370 can limit the movement of the support frame 310 in the X direction, and the third linear slide rail 380 can limit the movement of the support frame 310 in the Y direction.

[0169] In other embodiments, the second driving unit 221 can also be configured to drive the second pressing plate 222 in three-dimensional directions. Of course, in other embodiments, each driving component unit can also be configured to drive the pressing plate or the welding head in other directions.

[0170] In some embodiments of the present application, as Figure 10 and Figure 12 shown, the support base 100 can include a conveying track 110 and a battery cell fixture 120. The battery cell fixture 120 is installed on the conveying track 110. The conveying track 110 can be used to convey the battery cell fixture 120 to the ear pressing structure 200 and convey the battery cell fixture 120 away from the ear pressing structure 200. The battery cell fixture 120 can be configured to support and fix the core body 22a of the battery cell 20a.

[0171] Optionally, the support base 100 can further include an up-and-down driving module 130 and a horizontal driving module 140. The up-and-down driving module 130 can be configured to be able to drive the battery cell fixture 120 to drive the battery cell 20a to move in the first direction Z, and the horizontal driving module 140 can be configured to be able to drive the battery cell fixture 120 to drive the battery cell 20a to move in the third direction X or the second direction Y.

[0172] By setting the conveying track 110 and the battery cell fixture 120, the battery cell 20a can be easily fixed on the conveying track 110, so that the battery cell 20a is not easily displaced and dropped, and the battery cell 20a can be easily conveyed to the welding station corresponding to the pole tab welding mechanism 10, so as to facilitate the welding of the pole tab sheet 211a.

[0173] In some embodiments of the present application, Figure 13 As shown, the battery assembly system 20 includes the tab welding mechanism 10 in the above-mentioned embodiment.

[0174] In some embodiments, Figure 1 As shown, the battery 1 may include a housing 10a, a bottom cover 30a and a battery cell 20a. The housing 10a may have an open end 12a, and a pole 15a may be provided on a wall of the housing 10a opposite to the open end 12a. The pole 15a may have a through hole 14a. The housing 10a and the bottom cover 30a are connected to form a receiving cavity 11a connected to the through hole 14a. The active material coating portion of the battery cell 20a is disposed in the housing 10a, and the pole ear portion 21a of the battery cell 20a passes through the through hole 14a and is connected to the side of the pole 15a away from the receiving cavity 11a.

[0175] like Figure 13 As shown, the battery assembly system 20 also includes a conveying device 21 and an assembly device 22, wherein the conveying device 21 is used to convey the structure to be assembled to each station of the assembly device 22. The station of the assembly device 22 includes at least a tab welding mechanism 10. The tab welding mechanism 10 is used to weld a plurality of tab sheets 211a of the core body to form a tab portion 21a.

[0176] It should be noted that, in this embodiment, the conveying equipment 21 may include a conveyor line 23. The conveyor line 23 can be a conveying structure formed by a conveyor roller driven by a motor and a conveyor belt, or a conveying structure formed by a motor-driven conveyor chain link, or an AGV conveying cart, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0177] The purpose of the pole tab welding mechanism 10 is to form the pole tab portion 21a after pre-welding of multiple pole tab sheets 211a, and ultrasonic welding equipment can be selected, which can ensure that multiple pole tab sheets 211a are welded in a clamped and stable state.

[0178] In some embodiments, the conveying device 21 can be linked with the conveying track 110 of the tab welding mechanism 10 to realize the transmission of the battery cell 20a. For example, the conveying device 21 is an AGV conveying vehicle, and the conveying device 21 can transfer the battery cell 20a from other workstations to the conveying track 110 of the tab welding mechanism 10, so that the conveying track 110 can further transfer the battery cell 20a to the position corresponding to the tab pressing structure 200 and the welding assembly 300, so that the tab welding mechanism 10 presses, gathers and welds the tab sheet 211a in the battery cell 20a to form the tab portion 21a.

[0179] Alternatively, the conveying equipment 21 can be a conveying line 23, which is connected to the conveying track 110. The conveying line 23 can convey the battery cell 20a to the conveying track 110, and then the conveying track 110 can further convey the battery cell 20a to the position corresponding to the pole ear pressing structure 200 and the welding assembly 300.

[0180] Of course, in other embodiments, when the conveying equipment 21 is a conveyor line 23, the pole tab welding mechanism 10 may not be provided with a conveying track 110, and the conveyor line 23 may be directly provided corresponding to the pole tab welding mechanism 10, and the conveyor line 23 can transfer the battery cell 20a to the position of the corresponding pole tab pressing structure 200 and the welding assembly 300, so that the pole tab welding mechanism 10 can press, gather and weld the pole tab sheet 211a in the battery cell 20a to form the pole tab portion 21a.

[0181] In some embodiments. Figure 13 As shown, the workstation of the assembly equipment 22 may further include a shell insertion device 24, a pole ear insertion device 25, a pole welding device 26, and a bottom cover welding device 27. Among them, the conveying device 21 can be used to convey the battery cell 20a formed with the pole ear portion 21a to the shell insertion device 24, the pole ear insertion device 25, the pole welding device 26, and the bottom cover welding device 27 in sequence.

[0182] The shell insertion device 24 can be used to load the core 22a into the housing 10a from the open end 12a. The pole ear insertion device 25 can be used to clamp the pole ear portion 21a through the through hole 14a when the core 22a is loaded into the housing 10a. The pole welding device 26 can be used to weld the pole ear portion 21a passing through the through hole 14a to the side of the pole 15a away from the accommodating cavity 11a. The bottom cover welding device 27 can be used to weld the bottom cover 30a to the open end 12a of the housing 10a.

[0183] Among them, the case loading device 24 can be a pushing mechanism or a clamping mechanism, which can stably move the core body 22a towards the open end 12a of the housing 10a and enter the accommodation cavity 11a through the open end 12a. Similarly, the pole tab threading device 25 can adopt a clamping structure or a guiding structure, which can guide the pole tab part 21a to smoothly pass through the through hole 14a without interfering with the housing 10a. The purpose of the pole column welding device 26 is to realize the welding of the pole tab part 21a and the pole column 15a, and it can be selected as a laser welding device. The purpose of the bottom cover welding device 27 is to realize the circumferential edge welding of the bottom cover 30a and the open end 12a of the housing 10a, and it is also a laser welding device.

[0184] By arranging the case loading device 24, the pole tab threading device 25, the pole column welding device 26 and the bottom cover welding device 27 in the battery assembly system 20, the process of assembling the battery 1 in the battery assembly system 20 can be made smoother, the assembly process of the battery 1 can be simplified, and the standardization and intelligence of the process of assembling the battery 1 can be improved.

[0185] In addition, the assembly device 22 is not limited to including the pole tab welding mechanism 10, the case loading device 24, the pole tab threading device 25, the pole column welding device 26 and the bottom cover welding device 27. Exemplarily, when the number of core bodies 22a is multiple, for example, two, the assembly device 22 further includes a pairing device 28, which is used to stack multiple core bodies 22a so that the pole tab pieces 211a of the two core bodies 22a are substantially opposite, so that the conveying structure can convey the paired core bodies 22a to the pole tab welding mechanism 10a for welding the pole tab pieces 211a to facilitate the formation of the pole tab part 21a. Another example is that in order to ensure the reliability of the battery 1 assembly process, a dust removal and NG detection station, etc. can also be added between any two adjacent workstations, which is not limited in this embodiment.

[0186] According to some embodiments of the application, such as Figures 2 to 12As shown, the tab welding mechanism 10 may include a base 11, a support base 100, a tab pressing structure 200, and a welding assembly 300. Among them, the support base 100 is disposed on the base 11 and is used to support and fix the core 22a of the battery cell 20a; the tab pressing structure 200 is disposed on the base 11 and is configured to be able to move toward the support base 100 to press and gather multiple tab pieces 211a stacked on the battery cell 20a. The welding assembly 300 is disposed on the base 11 and is configured to be able to move toward the support base 100 to weld the gathered multiple tab pieces 211a to form a tab portion 21a. The tab pressing structure 200 includes a first component 210 and a second component 220 that are respectively movably disposed on the base 11. The first component 210 and the second component 220 may be configured to be relatively close to or away from each other. When the first component 210 and the second component 220 are relatively close to each other, a clamping cavity 201 can be formed. The first component 210 and the second component 220 are used to clamp multiple tab pieces 211a in the clamping cavity 201 to press and gather the multiple tab pieces 211a. The first component 210 includes a first driving unit 211 and a first pressing plate 212. The first driving unit 211 is installed on the base 11. The first driving unit 211 can be in transmission connection with the first pressing plate 212. The first driving unit 211 can be configured to drive the first pressing plate 212 to be close to or away from the support base 100. The second component 220 includes a second driving unit 221 and a second pressing plate 222. The second driving unit 221 is installed on the base 11. The second driving unit 221 is configured to drive the second pressing plate 222 to be close to or away from the support base 100. Among them, the first driving unit 211 and the second driving unit 221 are respectively located on both sides of the support base 100 so that the first component 210 and the second component 220 can be relatively close to or away from each other to form a clamping cavity 201 with adjustable size. The welding assembly 300 includes a support frame 310, a first welding unit 320, and a second welding unit 330. The support frame 310 can be in transmission connection with the first driving unit 211. The first welding unit 320 and the second welding unit 330 can be installed on the support frame 310. And the first welding unit 320 and the second welding unit 330 weld the multiple tab pieces 211a from both sides of the multiple tab pieces 211a respectively. The first welding unit 320 includes a first welding head 321 and a first driving member 322. The first driving member 322 is installed on the support frame 310. The first welding head 321 is installed on the first driving member 322. The first driving member 322 is in transmission connection with the first welding head 321. The first driving member 322 can be used to drive the first welding head 321 to be close to or away from the support base 100. The first pressing plate 212 may have a first through hole 2224 for the portion facing the second pressing plate 222. The first driving member 322 can be configured to drive the end of the first welding head 321 to enter the first through hole 2224 or move out of the first through hole 2224.And / or, the first pressing plate 212 may further include a blowing structure 2121. The air outlet 2122 of the blowing structure 2121 is disposed on the side of the first pressing plate 212 facing the second pressing plate 222, and is configured to smooth the tab 211a by blowing. The second welding unit 330 includes a second welding head 331 and a second driving member 332. The second driving member 332 is in transmission connection with the second welding head 331, and the second driving member 332 is configured to drive the second welding head 331 to move closer to or away from the moving support base 100. The second pressing plate 222 has a second through hole 2123 for facing the first pressing plate 212. The second driving member 332 is configured to drive the end of the second welding head 331 to enter or move out of the second through hole 2123. The welding assembly 300 further includes a first dust suction unit 340 and a second dust suction unit 350. The first dust suction unit 340 and the second dust suction unit 350 are respectively configured to suck dust from the welding area of the first welding unit 320 and the welding area of the second welding unit 330. The first driving unit 211 is configured to drive the first pressing plate 212 in three-dimensional directions. The first driving unit 211 may include a first driving component 202, a second driving component 203, and a third driving component 204. The first driving component 202 is in transmission connection with the first pressing plate 212 and is configured to drive the first pressing plate 212 to move along the first direction Z. The second driving component 203 is in transmission connection with the first driving component 202 and is configured to drive the first driving component 202 to move along the second direction Y. The third driving component 204 is in transmission connection with the second driving component 203 and is configured to drive the second driving component 203 to move along the third direction X to approach or move away from the support base 100. Wherein, the first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs. The second pressing plate 222 includes a first mating surface 2221, a second mating surface 2222, and a third mating surface 2223. The second mating surface 2222 is disposed at an obtuse angle to the first mating surface 2221, and the third mating surface 2223 is bent relative to the second mating surface 2222. The first mating surface 2221 is configured to press on the core 22a of the battery cell 20a, the second mating surface 2222 is configured to cover a part of the end face of the core 22a where the tab 211a is provided, and the third mating surface 2223 can be configured to press a plurality of tabs 211a on the first pressing plate 212. The support base 100 includes a conveying track 110 and a battery cell fixture 120. The battery cell fixture 120 is installed on the conveying track 110, and the conveying track 110 is configured to convey the battery cell fixture 120 to the tab pressing structure 200 and convey the battery cell fixture 120 away from the tab pressing structure 200. The battery cell fixture 120 is configured to support and fix the core 22a of the battery cell 20a.

[0187] In some embodiments of the present application, such as Figure 1 and Figure 13As shown, the battery assembly system 20 includes the tab welding mechanism 10 in the above embodiment. The battery 1 may include a shell 10a, a bottom cover 30a and a battery cell 20a. The shell 10a may have an open end 12a, and the shell 10a may be provided with a pole 15a on the wall opposite to the open end 12a, and the pole 15a may have a through hole 14a, and the shell 10a and the bottom cover 30a are connected to form a receiving chamber 11a connected to the through hole 14a. The active material coating portion of the battery cell 20a is arranged in the shell 10a, and the tab portion 21a of the battery cell 20a is connected to the side of the pole 15a away from the receiving chamber 11a through the through hole 14a. The battery assembly system 20 also includes a conveying device 21 and an assembly device 22, and the conveying device 21 is used to convey the structure to be assembled to each station of the assembly device 22. The station of the assembly device 22 includes at least the tab welding mechanism 10. Among them, the workstation of the assembly equipment 22 is used to weld multiple pole tabs 211a of the core to form a pole tab portion 21a. The battery assembly system 20 also includes a shell entry device 24, a pole tab insertion device 25, a pole column welding device 26 and a bottom cover welding device 27. Among them, the conveying device 21 can be used to convey the battery cell 20a formed with the pole tab portion 21a to the shell entry device 24, the pole tab insertion device 25, the pole column welding device 26 and the bottom cover welding device 27 in sequence. Among them, the shell entry device 24 is used to load the core 22a from the open end 12a into the housing 10a. The pole tab insertion device 25 is used to clamp the pole tab portion 21a through the through hole 14a when the core 22a is loaded into the housing 10a. The pole column welding device 26 is used to weld the pole tab portion 21a passing through the through hole 14a to the side of the pole 15a away from the accommodating cavity 11a. The bottom cover welding device 27 is used to weld the bottom cover 30a to the opening end 12a of the housing 10a.

[0188] In summary, the present application is not only provided with a welding assembly 300 on the tab welding mechanism 10, but also provided with a support seat 100 and a tab pressing structure 200. Such a design enables the tab welding mechanism 10 to not only weld the tab sheet 211a of the battery cell 20a, but also press and gather the tab sheet 211a before welding to compact the tab sheet 211a, thereby shortening the interval between the tab sheets 211a to compact the tab sheet 211a, facilitating the welding of the tab 21a, thereby reducing the difficulty of welding and improving the yield rate of the battery cell 20a. The support seat 100 can transport the battery cell 20a to the position corresponding to the tab pressing structure 200 or the welding assembly 300, so as to facilitate the pressing and welding of the tab sheet 211a of the battery cell 20a, and also facilitate the transportation of the battery cell 20a to other positions after the tab sheet 211a is pressed and welded to form the tab portion.

[0189] The above are only embodiments of the present application, and do not thereby limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall equally be included within the patent protection scope of the present application.

Claims

1. An ear welding mechanism, characterized in that, it includes: a base; a support seat disposed on the base for supporting and fixing the core body of the battery cell; an ear pressing structure disposed on the base and configured to be movable towards the support seat for pressing and gathering multiple ear pieces of the stacked battery cells; and a welding assembly disposed on the base and configured to be movable towards the support seat to weld the gathered multiple ear pieces to form an ear portion.

2. The ear welding mechanism according to claim 1, characterized in that, the ear pressing structure includes a first component and a second component respectively movably disposed on the base, the first component and the second component are configured to be able to approach or move away from each other relatively, and a clamping cavity can be formed when the first component and the second component approach relatively, and the first component and the second component are used for clamping the multiple ear pieces in the clamping cavity to press and gather the multiple ear pieces.

3. The ear welding mechanism according to claim 2, characterized in that, the first component includes a first driving unit and a first pressing plate, the first driving unit is installed on the base, the first driving unit is in transmission connection with the first pressing plate, and the first driving unit is configured to drive the first pressing plate to approach or move away from the support seat.

4. The ear welding mechanism according to claim 3, characterized in that, the second component includes a second driving unit and a second pressing plate, the second driving unit is installed on the base, the second driving unit is in transmission connection with the second pressing plate, and the second driving unit is configured to drive the second pressing plate to approach or move away from the support seat; wherein, the first driving unit and the second driving unit are respectively located on both sides of the support seat so that the first component and the second component can approach or move away from each other relatively to form the clamping cavity with adjustable size.

5. The ear welding mechanism according to claim 4, characterized in that, the welding assembly includes a support frame, a first welding unit and a second welding unit; the support frame is in transmission connection with the first driving unit, the first welding unit and the second welding unit are installed on the support frame, and the first welding unit and the second welding unit weld the multiple ear pieces from both sides of the multiple ear pieces respectively.

6. The ear welding mechanism according to claim 5, characterized in that, the first welding unit includes a first welding head and a first driving component, the first driving component is installed on the support frame, the first driving component is in transmission connection with the first welding head, and is used for driving the first welding head to approach or move away from the support seat.

7. The ear welding mechanism according to claim 6, characterized in that, The first pressing plate has a first through hole facing the second pressing plate, and the first driving member is configured to drive the end of the first welding head into or out of the first through hole; and / or, the first pressing plate further includes a blowing structure, and an air outlet of the blowing structure is arranged on a side of the first pressing plate facing the second pressing plate for smoothing the tab through blowing.

8. The tab welding mechanism according to claim 5, wherein, the second welding unit includes a second welding head and a second driving member, the second driving member is installed on the support frame, and the second driving member is in transmission connection with the second welding head for driving the second welding head to approach or move away from the support seat.

9. The tab welding mechanism according to claim 8, wherein, the second pressing plate has a second through hole facing the first pressing plate, and the second driving member is configured to drive the end of the second welding head into or out of the second through hole.

10. The tab welding mechanism according to claim 5, wherein, the welding assembly further includes a first dust suction unit and a second dust suction unit, and the first dust suction unit and the second dust suction unit are respectively used for sucking dust from the welding area of the first welding unit and the welding area of the second welding unit.

11. The tab welding mechanism according to claim 3, wherein, the first driving unit is configured to drive the first pressing plate in three-dimensional directions.

12. The tab welding mechanism according to claim 11, wherein, the first driving unit includes a first driving assembly, a second driving assembly and a third driving assembly; the first driving assembly is in transmission connection with the first pressing plate for driving the first pressing plate to move along a first direction; the second driving assembly is in transmission connection with the first driving assembly for driving the first driving assembly to move along a second direction; the third driving assembly is in transmission connection with the second driving assembly for driving the second driving assembly to move along a third direction to approach or move away from the support seat; wherein, the first direction, the second direction and the third direction are perpendicular to each other in pairs.

13. The tab welding mechanism according to claim 4, wherein, the second pressing plate includes a first mating surface, a second mating surface and a third mating surface, the second mating surface is arranged at an obtuse angle with the first mating surface, and the third mating surface is bent relative to the second mating surface; the first mating surface is used for pressing on the core body of the battery cell, the second mating surface is used for covering a part of the end face of the battery cell provided with tabs, and the third mating surface is used for pressing the plurality of tabs on the first pressing plate.

14. The tab welding mechanism according to any one of claims 1 to 13, wherein, The support seat comprises a conveying track and a battery jig, wherein the conveying track is arranged on the base, the battery jig is mounted on the conveying track, and the conveying track is used to convey the battery jig to the tab pressing structure, and convey the battery jig away from the tab pressing structure; The battery cell fixture is configured to support and fix the core body of the battery cell.

15. A battery assembly system, It is characterized in that It comprises a tab welding mechanism according to any one of claims 1 to 14.

16. The battery assembly system according to claim 15, It is characterized in that The battery comprises a shell, a bottom cover and a battery cell; the shell has an open end, a pole is arranged on a wall of the shell opposite to the open end, the pole has a through hole, the shell and the bottom cover are connected to form a receiving cavity connected to the through hole; the active material coating part of the battery cell is arranged in the shell, and the pole ear part of the battery cell passes through the through hole and is connected to a side of the pole away from the receiving cavity; The battery assembly system further includes a conveying device and an assembly device, wherein the conveying device is used to convey the structure to be assembled to each station of the assembly device; the station of the assembly device at least includes the tab welding mechanism; Wherein, the tab welding mechanism is used to weld a plurality of tab sheets of the battery cell to form a tab portion.

17. The battery assembly system according to claim 16, It is characterized in that The workstation of the assembly equipment also includes a shell insertion device, a pole ear insertion device, a pole welding device and a bottom cover welding device; Wherein, the conveying equipment is used to convey the battery cell with the pole ear portion formed thereon to the shell insertion device, the pole ear piercing device, the pole welding device and the bottom cover welding device in sequence; wherein, the shell insertion device is used to load the battery cell into the shell from the open end; the pole ear piercing device is used to clamp the pole ear portion through the through hole when the battery cell is loaded into the shell; the pole welding mechanism is used to weld the pole ear portion passing through the through hole to the side of the pole away from the accommodating cavity; the bottom cover welding device is used to weld the bottom cover to the open end of the shell.

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