Tab welding mechanism and battery assembly system

Abstract

A tab welding mechanism (10) and a battery assembly system (20). The tab welding mechanism (10) comprises a base platform (11), a support base (100), a tab pressing structure (200), and a welding assembly (300). The support base (100) is provided on the base platform (11) and is used for supporting and fixing a cell body (22a) of a battery cell (20a); the tab pressing structure (200) is provided on the base platform (11) and is configured to be capable of moving toward the support base (100), so as to press and gather a plurality of laminated tab pieces (211a) of the battery cell (20a); and the welding assembly (300) is provided on the base platform (11) and is configured to be capable of moving toward the support base (100), so as to weld the plurality of gathered tab pieces (211a) to form a tab portion (21a).

Description

Tab welding mechanism and battery assembly system

[0001] This application claims priority to Chinese patent application 2023116436946, filed on November 30, 2023, entitled “Tab welding mechanism and battery assembly system,” the entire contents of which are incorporated herein by reference.

Technical field

[0002] The present application relates to the field of battery technology, and in particular to a tab welding mechanism and a battery assembly system. [Background Technology]

[0003] A battery is a device that converts chemical energy into electrical energy. It contains a cup, tank, or other container, or a portion of a composite container, that contains an electrolyte solution and metal electrodes to generate an electric current. With the advancement of technology, batteries, with their advantages of portability, ease of charge and discharge, and long-term stable power supply, have become widely used in automobiles, home appliances, aerospace, and other fields.

[0004] 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 the pole tabs to the pole posts. However, the welding process of the pole tabs is complicated, making the battery preparation more difficult and reducing the battery yield.

[0005] [Summary of the invention]

[0006] 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 the tab welding process and improve the yield rate of the battery.

[0007] In a first aspect, the present application provides a tab welding mechanism, comprising a base, a support seat, a tab pressing structure, and a welding assembly. The support seat is disposed on the base and is used to support and secure the core of the battery cell; the tab pressing structure is disposed on the base and is configured to move toward the support seat to press and gather the multiple tabs stacked on the battery cell; and the welding assembly is disposed on the base and is configured to move toward the support seat to weld the gathered multiple tabs to form a tab portion.

[0008] 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 tabs of the battery cell, but also allows the tab pressing structure to press and fold the tabs before welding, thereby shortening the interval between the tabs to compact the tabs, 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 press welding of the tabs of the battery cell, and also facilitate the transportation of the battery cell to other locations after the tabs are pressed and welded to form the tab portion.

[0009] In some embodiments, the tab pressing structure includes a first component and a second component movably disposed on a base. The first component and the second component are configured to be relatively close to or distant from each other. When the first component and the second component are relatively close to each other, a clamping cavity is formed. The first component and the second component are used to clamp multiple tabs in the clamping cavity to press and gather the multiple tabs.

[0010] By arranging the first component and the second component to cooperate with each other to be relatively close to or far away from each other, the pole tab pressing structure can confine the pole tab sheet in the clamping cavity and press and gather the pole tab sheet to compact the pole tab sheet, thereby facilitating subsequent welding of the pole tab sheet.

[0011] 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.

[0012] By setting a 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 tabs 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 tab after pressing and retracting the pole tabs, so that the first pressing plate will not affect the movement of the battery cell.

[0013] In some embodiments, the second assembly includes a second drive unit and a second pressing plate, the second drive unit being mounted on the base and in transmission connection with the second pressing plate, and the second drive unit being configured to drive the second pressing plate toward or away from the support base. The first drive unit and the second drive unit are respectively located on either side of the support base, so that the first assembly and the second assembly can be relatively moved toward or away from each other to form a clamping cavity with adjustable size.

[0014] By setting a second driving unit to drive the second pressing plate to move closer to or away from the support base so as to move closer to or away from the core body of the battery cell on the support base, the first component and the second component form a clamping cavity with adjustable size, which can facilitate the first pressing plate and the second pressing plate to cooperate in pressing and closing the two side surfaces of the multiple pole tabs of the battery cell, thereby compacting the multiple pole tabs.

[0015] 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, and 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 plurality of tabs from both sides of the plurality of tabs.

[0016] By mounting the first and second welding units on the support frame, the first driving unit can drive both the first and second welding units toward the tab. Simultaneously welding both sides of the tab using the two welding units can make the tab weld more secure, thereby enhancing the tab welding effect and increasing the tab welding efficiency.

[0017] 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 and is transmission-connected to the first welding head for driving the first welding head toward or away from the support seat.

[0018] By setting up a transmission connection between the first driving component and the first welding head, the first welding head can be moved independently under the transmission of the first driving component, so that the first welding unit can adjust its position to align with one side of multiple tabs, thereby achieving precise welding.

[0019] In some embodiments, the first pressing plate has a first through hole facing the second pressing plate, and the first driving component 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, the air outlet of the blowing structure being disposed on a side of the first pressing plate facing the second pressing plate, for smoothing the tab by blowing air.

[0020] By enabling the end of the first welding head to enter and exit the first through-hole of the first pressing plate, the first welding head can weld multiple tabs after the first pressing plate has gathered and compacted the tabs. During the welding process, the first pressing plate can secure the tabs, preventing them from deforming, facilitating the first welding head's ability to weld one side of the multiple tabs. Furthermore, the provision of an air blowing structure to smooth the tabs by blowing air can further regularize the tab's shape.

[0021] 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 is transmission-connected to the second welding head for driving the second welding head toward or away from the support seat.

[0022] By setting up a second driving component and a transmission connection with the second welding head, the second welding head can be moved independently under the transmission of the second driving component, so that the second welding unit can adjust its position to align with one side of multiple tabs, thereby achieving precise welding.

[0023] 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 into or out of the second through hole.

[0024] By setting the end of the second welding head to be able to enter and move out of the second through hole of the second pressing plate, the second welding head can weld multiple pole tabs after the second pressing plate is folded and compacted. During the welding process, the second pressing plate can fix the multiple pole tabs, making it difficult for the pole tabs to deform, thereby facilitating the second welding head to weld one side of multiple pole tabs.

[0025] 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 used to suction the welding area of ​​the first welding unit and the welding area of ​​the second welding unit, respectively.

[0026] By setting up the first dust suction unit and the second dust suction unit respectively for the welding area of ​​the first welding unit and the welding area of ​​the second welding unit, the debris dust generated in the welding area can be absorbed, so that the debris dust is not easily adsorbed on the pole ear part and affects the use of the pole ear part and subsequent processing steps.

[0027] In some embodiments, the first driving unit is configured to drive the first pressing plate in three-dimensional directions.

[0028] By configuring the first pressing plate to be movable in three directions in three dimensions, the first pressing plate can be conveniently used to accurately locate the position of the tab, thereby pressing and retracting the tab.

[0029] In some embodiments, the first drive unit includes a first drive assembly, a second drive assembly, and a third drive assembly. The first drive assembly is transmission-connected to the first pressing plate for driving the first pressing plate to move in a first direction. The second drive assembly is transmission-connected to the first drive assembly for driving the first drive assembly to move in a second direction. The third drive assembly is transmission-connected to the second drive assembly for driving the second drive assembly to move in a third direction to move closer to or further from the support base. The first direction, the second direction, and the third direction are each perpendicular to one another.

[0030] 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 achieved, and the first pressing plate can be driven to move in three directions in a simple manner.

[0031] In some embodiments, the second pressing plate includes a first mating surface, a second mating surface, and a third mating surface, wherein the second mating surface is arranged at an obtuse angle to the first mating surface, and the third mating surface is arranged to be bent relative to the second mating surface. The first mating surface is used to press on the core body of the battery cell, the second mating surface is used to cover a portion of the end surface of the battery cell where the tab is provided, and the third mating surface is used to press the multiple tabs onto the first pressing plate.

[0032] By setting three matching surfaces on the second pressing plate that are adapted to the core body of the battery cell and multiple pole tabs, the second pressing plate can be conveniently positioned according to the core body of the battery cell to correspond to the positions of the multiple pole tabs, so as to more effectively press and close the multiple pole tabs.

[0033] In some embodiments, the support base includes a conveyor track and a battery cell jig. The battery cell jig is mounted on the conveyor track and is used to transport the battery cell jig to and from the tab pressing structure. The battery cell jig is configured to support and secure the core of the battery cell.

[0034] 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, and it is also convenient to convey the battery cell to the welding station corresponding to the tab welding mechanism, thereby facilitating the welding of the tab sheet.

[0035] In a second aspect, the present application provides a battery assembly system, which includes the tab welding mechanism in the above embodiment.

[0036] 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 provided 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 transport 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.

[0037] By setting up 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.

[0038] In some embodiments, the workstations of the assembly equipment further include a shell insertion device, a pole ear insertion device, a pole welding device, and a bottom cover welding device. The conveying device is used to convey the battery cells with pole ear portions to the shell insertion device, the pole ear insertion device, the pole welding device, and the bottom cover welding device in sequence. The shell insertion device is used to load the battery cells 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 cells are loaded into the housing. The pole welding device is used to weld the pole ear portion that passes through the through hole to the side of the pole facing away from the accommodating cavity. The bottom cover welding device is used to weld the bottom cover to the open end of the housing.

[0039] By providing a shell insertion device, a pole ear piercing device, a pole welding device and a bottom cover welding device in the battery assembly system, the battery assembly process of 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.

[0040] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below.

Brief Description of the Drawings

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0042] FIG1 is a schematic structural diagram of a battery cell according to some embodiments of the present application;

[0043] FIG2 is a partial structural diagram of a tab welding mechanism according to some embodiments of the present application;

[0044] FIG3 is a schematic diagram of a partial structure of the tab welding mechanism embodiment shown in FIG2 from another perspective;

[0045] FIG4 is an enlarged schematic diagram of the O region of the embodiment of the tab welding mechanism shown in FIG2 ;

[0046] FIG5 is an enlarged schematic diagram of the P region of the tab welding mechanism embodiment shown in FIG3 ;

[0047] FIG6 is a schematic diagram of another portion of the structure of the tab welding mechanism according to some embodiments of the present application;

[0048] FIG7 is a schematic structural diagram of a second component in a tab welding mechanism in some embodiments of the present application;

[0049] FIG8 is a schematic structural diagram of a portion of a tab welding mechanism in some other embodiments of the present application;

[0050] FIG9 is a schematic side view of the structure of the second pressing plate in the embodiment of the tab welding mechanism shown in FIG8 ;

[0051] FIG10 is a schematic diagram of the overall structure of a tab welding mechanism according to some embodiments of the present application;

[0052] FIG11 is a schematic structural diagram of a first driving unit in a tab welding mechanism in some embodiments of the present application;

[0053] FIG12 is a schematic structural diagram of a support base in a tab welding mechanism according to some embodiments of the present application;

[0054] FIG13 is a schematic block diagram of the structure of a battery assembly system according to some embodiments of the present application.

[0055] The reference numerals in the specific embodiment are as follows: battery 1, housing 10a, battery cell 20a, accommodating cavity 11a, through hole 14a, tab 21a, pole 15a, open end 12a, bottom cover 30a, core 22a; Tab welding mechanism 10, base 11, support seat 100, tab pressing structure 200, welding assembly 300, first assembly 210, second assembly 220, first drive unit 211, first pressing plate 212, first motor 2111, first reducer 2112, first screw 2113, first floating joint 2114, second drive 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 drive component 322, first through hole 2224, first cylinder 3221, blowing structure 2121, air outlet 2122. Second welding head 331, second driving component 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 screw rod 2116, third motor 2117, third screw rod 2118, first linear slide 360, second linear slide 370, third linear slide 380, first mating surface 2221, second mating surface 2222, third mating surface 2223, conveying track 110, battery cell fixture 120, upper and lower driving module 130, horizontal driving module 140; battery assembly system 20, conveying equipment 21, assembly equipment 22, conveying line 23, shell insertion device 24, ear piercing device 25, pole welding device 26 and bottom cover welding device 27. [Specific implementation method]

[0056] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0058] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0059] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0061] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0062] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0063] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0064] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0065] In existing battery technology, during battery assembly, the tabs connecting the positive and negative electrodes in the cell need to be welded together to form the tabs, facilitating welding of the tabs to the terminal posts. However, the tab welding process is complex, making battery production more difficult and reducing the battery yield rate. In particular, when multiple electrode assemblies are stacked to form a cell, the tabs of the multiple cells need to be welded together. However, this can lead to gaps between the tabs, resulting in insecure welds.

[0066] In order to simplify the welding process of the tabs, improve welding efficiency and battery yield, the battery cell can be positioned before welding to fix the tabs, and the tabs can be compacted to form tab parts before welding, and then the tab parts and the poles can be welded.

[0067] Based on the above considerations, the present application provides a tab welding mechanism and a battery assembly system. The tab welding mechanism includes a base, a support seat, a tab pressing structure and a welding assembly. The support seat is provided on the base and is used to support and fix the core body of the battery cell. The tab pressing structure is provided on the base and is configured to be able to move toward the support seat to press and gather the multiple tab sheets stacked on the battery cell. The welding assembly is provided on the base and is configured to be able to move toward the support seat to weld the multiple tab sheets that are gathered to form a tab portion.

[0068] In the technical solution of the embodiment of the present application, the tab welding mechanism is not only provided with a welding mechanism on the base, but also provided with a support seat and a tab pressing structure. This design enables the tab welding mechanism to not only weld the tabs of the battery cell, but also to press and fold the tabs before welding, thereby shortening the interval between the tabs to compact the tabs, facilitating the welding of the tabs, thereby 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 welding assembly, so as to facilitate the pressing and welding of the tabs of the battery cell to form the tab portion, and also facilitate the transportation of the battery cell to other locations after the tabs are pressed and welded.

[0069] The battery 1 will be described below as an example.

[0070] As shown in Figure 1, battery 1 refers to a cup, tank, or other container, or portion of a composite container, that holds an electrolyte solution and metal electrodes to generate an electric current. It is a device that converts chemical energy into electrical energy. Battery 1 can be a battery pack or an energy storage device. Energy storage devices include energy storage containers and energy storage cabinets.

[0071] 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 include other functional components.

[0072] Specifically, the housing 10a may have an open end 12a. A terminal 15a may be provided on a wall of the housing 10a opposite the open end 12a. The terminal 15a may have a through-hole 14a. The housing 10a and the bottom cover 30a are connected to form a receiving cavity 11a that communicates with the through-hole 14a. The active material coating of the battery cell 20a is disposed within the housing 10a. The tab 21a of the battery cell 20a passes through the through-hole 14a and connects to the side of the terminal 15a facing away from the receiving cavity 11a.

[0073] In some embodiments, the housing 10a is used to encapsulate components such as the battery cell 20a and the electrolyte.

[0074] 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. A tab 21a can be provided at one end of the battery cell 20a. The battery cell 20a is located within the accommodating cavity 11a, and the tab 21a extends through the through-hole 14a.

[0075] Optionally, the battery 1 may further include a bottom cover 30 a , which is used to cover the opening end 12 a so that the battery cell 20 a is not likely to fall out of the opening end 12 a after being placed in the shell.

[0076] The bottom cover 30a covers the open end 12a of the housing 10a to isolate the internal environment of the battery 1 from the external environment. The shape of the bottom cover 30a can be adapted to the shape of the open end 12a to fit the housing 10a. Optionally, the bottom cover 30a can be made of a material with a certain hardness and strength (such as an aluminum alloy). This makes the bottom cover 30a less likely to deform when subjected to compression or collision, thereby providing the battery 1 with greater structural strength and improved safety.

[0077] The terminal 15a can be disposed at the top 13a of the housing 10a. The terminal 15a can be used to electrically connect to the battery cell 20a to output or input electrical energy to or from the battery 1. In some embodiments, the housing 10a can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery 1 reaches a threshold.

[0078] The shell 10a is a component used to cooperate with the bottom cover 30a to form the internal environment of the battery 1, wherein the formed internal environment can be used to accommodate the battery cell 20a, electrolyte and other components. The shell 10a and the bottom cover 30a can be independent components. The open end 12a can be set on the shell 10a, and the internal environment of the battery 1 is formed by covering the open end 12a with the bottom cover 30a at the open end 12a. In other embodiments, the shape of the shell 10a can be determined according to the specific shape and size of the battery cell 20a. The material of the shell 10a can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0079] In some embodiments, the battery cell 20a includes tabs 21a and a core 22a. Tabs 21a can divert current from the core 22a. Tabs 21a include positive and negative tabs. The positive and negative tabs can be located together at one end of the core 22a or separately at opposite ends of the core 22a. During the battery's charge and discharge processes, the positive and negative active materials react with the electrolyte, and the tabs 21a connect to the poles 15a to form a current loop.

[0080] Optionally, the tab portion 21a can be formed by welding a plurality of tab sheets 211a. The plurality of tab sheets 211a can be provided as copper sheets or aluminum sheets corresponding to the positive tab or the negative tab. In other embodiments, the tab sheets 211a can also be made of metal materials such as silver sheets or nickel sheets.

[0081] In some embodiments, the core 22a includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 20a, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0082] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0083] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0084] As an example, the positive electrode current collector may be a metal foil 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 electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum 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.).

[0085] As an example, the positive electrode active material may 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 traditional materials that can be used as positive electrode active materials for battery 1 may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), 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 Mn1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0086] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0087] As an example, the negative electrode current collector can be a metal foil, a metal foam, 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 electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. 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 (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.).

[0088] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0089] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0090] As an example, the negative electrode active material may adopt the negative electrode active material for the battery cell 20a that is well known in the art. As an example, the negative electrode active material may 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 material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0091] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0092] In some embodiments, the core 22a further includes a separator, which is disposed between the positive electrode and the negative electrode.

[0093] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0094] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator 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 separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0095] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0096] In some embodiments, the battery cell 20a further includes an electrolyte, which acts as a conductive medium between the positive and negative electrodes. The present application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0097] The liquid electrolyte includes an electrolyte salt and a solvent.

[0098] 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0099] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can 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.

[0100] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0101] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0102] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0103] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0104] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0105] In some embodiments, the core 22a is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure. In other embodiments, the core 22a can also be a laminated structure, that is, a stacked structure formed by laminating the positive electrode sheet and the negative electrode sheet.

[0106] The present application provides a tab welding mechanism 10 that can be used to weld the tab sheet 211a of the battery cell 20a. Exemplarily, the welding process is pre-welding, corresponding to the ultrasonic welding process.

[0107] As shown in FIG. 2 and FIG. 5 , the tab welding mechanism 10 may include a base 11 , a support seat 100 , a tab pressing structure 200 and a welding assembly 300 .

[0108] The support base 100 can be disposed on the base 11 to support and secure the core 22a of the battery cell 20a. The tab pressing structure 200 can be disposed on the base 11 and configured to move toward the support base 100 to press and gather the multiple tabs 211a stacked on the battery cell 20a. The welding assembly 300 can be disposed on the base 11 and configured to move toward the support base 100 to weld the gathered tabs 211a to form the tab portion 21a.

[0109] Optionally, the location of the tab pressing structure 200 and the location of the welding assembly 300 on the base 11 may correspond to the location of the support base 100. When the support base 100 transports the core 22a of the battery cell 20a to the location corresponding to the tab pressing structure 200, the tab pressing structure 200 can move toward the tab 211a of the battery cell 20a on the support base 100 and be used to press and close the tab 211a of the battery cell 20a. The welding assembly 300 can weld the tab 211a, thereby forming a press-welding station at the locations of the support base 100 corresponding to the tab pressing structure 200 and the welding assembly 300.

[0110] Such a setting can facilitate the support seat 100 to transport the battery cell 20a to the pressing and welding station corresponding to the tab pressing structure 200 or the welding assembly 300, so as to facilitate the press welding of the tab sheet 211a of the battery cell 20a, and also facilitate the transportation of the battery cell 20a to other locations after the tab sheet 211a is pressed and welded to form the tab portion 21a.

[0111] Since the tab 211a of the battery cell 20a is formed by stacking the metal lead-out sheets of the negative electrode and the positive electrode in the battery cell 20a, the tab pressing structure 200 and the welding assembly 300 are both arranged at the same position, which not only enables the tab welding mechanism 10 to weld the tab 211a of the battery cell 20a, but also facilitates pressing and closing the tab 211a before welding, thereby shortening the interval between the tabs 211a to compact the tab 211a, facilitating the welding of the tab 211a, thereby reducing the difficulty of welding and improving the yield rate of the battery cell 20a.

[0112] In some embodiments of the present application, as shown in FIG2 and FIG5 , the tab pressing structure 200 may include a first component 210 and a second component 220 movably disposed on the base 11 . The first component 210 and the second component 220 may be configured to be relatively close to or distant from each other. When the first component 210 and the second component 220 are relatively close to each other, a clamping cavity 201 is formed. The first component 210 and the second component 220 are used to clamp a plurality of tabs 211 a in the clamping cavity 201 to press and gather the plurality of tabs 211 a.

[0113] Optionally, the first assembly 210 and the second assembly 220 can move toward or away from each other in a predetermined direction of motion. When the tab 211a is transported by the support base 100 to the press welding station, the tab 211a can be positioned between the first assembly 210 and the second assembly 220 in the predetermined direction of motion, with one side of the tab 21a facing the first assembly 210 and the other side of the tab 21a facing the second assembly 220. The predetermined direction of motion can be shown by arrow A in the figure.

[0114] 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.

[0115] Through the above-mentioned 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 tab pressing structure 200 to confine the pole tab 211a within the clamping cavity 201 and press and gather the pole tab 211a to compact the pole tab 211a, thereby facilitating subsequent welding of the pole tab 211a.

[0116] In some embodiments of the present application, as shown in Figures 2 to 4, 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.

[0117] By setting the first driving unit 211 to drive the first pressing plate 212 to move closer to or away from the support base 100 so as to move closer to or away from the core 22a of the battery cell 20a on the support base 100, it is convenient for the first pressing plate 212 to press and retract the pole tab 211a on the core 22a, and it is also convenient to use the first driving unit 211 to drive the first pressing plate 212 away from the pole tab 211a after compacting the pole tab 211a, so that the first pressing plate 212 will not affect the movement and transportation of the battery 1.

[0118] 6 , the first drive unit 211 may include a first motor 2111, a first reducer 2112, a first screw rod 2113, and a first floating joint 2114. The first reducer 2112 may be connected to the first motor 2111, the first screw rod 2113 may be connected to the first reducer 2112, and the first floating joint 2114 may be connected to the first screw rod 2113.

[0119] Specifically, the first motor 2111 is a power supply device for providing electrical energy to other components of the first drive unit 211. The first reducer 2112 is a reduction transmission device used to match the rotational speed and transmit torque between the first motor 2111 and the first screw rod 2113. The first screw rod 2113 is a motion mechanism that can transmit linear motion, enabling the first drive unit 2111 to drive the first pressing plate 212 away from or toward the pole piece 211a. The first floating joint 2114 is used to connect the first screw rod 2113 and the first pressing plate 212, enabling the first screw rod 2113 to drive the first pressing plate 212 to move.

[0120] Through the above-mentioned setting, the first driving unit 211 is configured as a screw drive, so that the first driving unit 211 can drive the first pressing plate 212 more quickly, and can also make the movement of the first pressing plate 212 more precise, so that the first pressing plate 212 can be aligned with the pole tab 211a, and the pole tab pressing structure 200 can quickly and accurately complete the pressing and retracting process of the pole tab 211a.

[0121] In some embodiments of the present application, as shown in Figures 2 to 7, the second component 220 may include a second driving unit 221 and a second pressing plate 222. The second driving unit 221 can be installed on the base 11, and the second driving unit 221 can be configured to drive the second pressing plate 222 to approach or move away from the support base 100 to approach or move away from the battery cell 20a on the support base 100.

[0122] 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.

[0123] For example, when the first drive unit 211 and the second drive unit 221 respectively drive the first assembly 210 and the second assembly 220 to gradually approach each other, the size of the clamping cavity 201 becomes smaller and smaller, and the first assembly 210 and the second assembly 220 further clamp and gather the tab 211a in the clamping cavity 201. After compacting the tab 211a, the first assembly 210 and the second assembly 220 move away from each other, and the size of the clamping cavity 201 becomes larger and larger.

[0124] By arranging the first driving unit 211 and the second driving unit 221 to drive the first assembly 210 and the second assembly 220 to move closer to each other, and cooperate with each other to press and gather the pole tab 211 a, the compaction effect of the pole tab 211 a can be improved.

[0125] Optionally, as shown in Figures 2 and 7, the second drive unit 221 may include a cylinder 2211, which is connected to the second pressing plate 222. The cylinder 2211 refers to a cylindrical component that guides the piston to perform linear reciprocating motion in the cylinder. Therefore, the cylinder 2211 is connected to the second pressing plate 222. The cylinder 2211 can drive the second pressing plate 222 to perform linear reciprocating motion relative to the support base 100, thereby achieving the pressing and shaping of the tab 211a. The cylinder 2211 has a 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 standardize and systematize the pressing and retracting process of the tab 211a, and can also reduce the cost of the tab pressing structure 200 and improve the reliability of the tab pressing structure 200.

[0126] In some embodiments of the present application, as shown in Figures 2 to 5, a 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 in transmission connection with 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 multiple tabs 211a from both sides of the multiple tabs 211a.

[0127] 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 .

[0128] By installing 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 together to approach the tab 211 a .

[0129] Optionally, when the support seat 100 transports the battery cell 20a to the pressing and welding station, corresponding to the pole tab pressing structure 200 and the welding assembly 300, the multiple pole 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 the multiple pole tabs 211a at the same time, which can make the welding of the multiple pole tabs 211a more firm, thereby enhancing the welding effect of the multiple pole tabs 211a and increasing the welding efficiency of the multiple pole tabs 211a.

[0130] In some embodiments of the present application, as shown in Figures 2 to 4, the first welding unit 320 may include a first welding head 321 and a first driving component 322. The first driving component 322 can be installed on the support frame 310. The first driving component 322 is transmission-connected to the first welding head 321. The first driving component 322 can be used to drive the first welding head 321 close to or away from the support base 100, so that it can be close to or away from the battery cell 20a on the support base 100.

[0131] Specifically, during the welding of the pole tab 21a, the first driving component 322 drives the support frame 310 to drive the first welding unit 320 to approach the multiple pole tab sheets 211a. At the same time, the first driving component 322 can be used to drive and adjust the position of the first welding head 321 so that the first welding head 321 can be accurately aligned with the multiple pole tab sheets 211a, thereby welding the multiple pole tab sheets 211a to improve the welding effect and efficiency of the welding assembly 300.

[0132] Optionally, as shown in Figures 2 to 4, the first driving component 322 may include a first cylinder 3221, which is connected to the first welding head 321 and can drive the first welding head 321 to move relative to the pole tab 21a, so that the first welding head 321 can align with multiple pole tab sheets 211a and weld multiple pole tab sheets 211a.

[0133] By setting up a transmission connection between the first driving component 322 and the first welding head 321, the first welding head 321 can be moved independently under the transmission of the first driving component 322, so that the first welding unit 320 can adjust its position to align with one side of the multiple tabs 211a, thereby achieving precise welding.

[0134] 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 a thermite 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 tabs 211a, so that the plurality of tabs 211a are sequentially welded to form the tab portion 21a.

[0135] In some embodiments of the present application, as shown in Figure 4, 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 into the first through hole 2224 or move out of the first through hole 2224.

[0136] 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 provided on the side of the first pressing plate 212 facing the second pressing plate 222 for smoothing the tab 211 a by blowing air.

[0137] 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 multiple pole tabs 211a after entering the first through hole 2224 to achieve precise welding of multiple pole tabs 211a.

[0138] Optionally, the blowing structure 2121 may include an air outlet 2122, through which wind can be blown. 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.

[0139] The air outlet 2122 may be located corresponding to the root of the tab 211a so that wind can be blown out from the air outlet 2122 and smooth the tab 211a from the root thereof, thereby further regularizing the overall shape of the tab 211a.

[0140] In some embodiments of the present application, as shown in Figures 2 to 5, the second welding unit 330 may include a second welding head 331 and a second driving component 332, which is transmission-connected to the second welding head 331 and can be used to drive the second welding head 331 close to or away from the support seat 100.

[0141] 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 together to approach the multiple pole tabs 211a. The second driving component 332 can then drive the second welding head 331 to approach and align the multiple pole tabs 211a to weld the multiple pole tabs 211a. After welding is completed, the second driving component 332 can drive the second welding head 331 away from the multiple pole tabs 211a, thereby not affecting the subsequent transportation of the battery cell 20a.

[0142] Optionally, the second driving component 332 may include a second cylinder 3321, which is connected to the second welding head 331 and can drive the second welding head 331 to move relative to the multiple pole tabs 211a, so that the second welding head 331 can align with the multiple pole tabs 211a and weld the multiple pole tabs 211a.

[0143] In different embodiments, the second pressing plate 222 may have different shapes.

[0144] For example, in some embodiments, as shown in Figure 5, the middle portion of the second pressing plate 222 close to the multiple pole tabs 211a can be moved away from the first pressing plate 212 along the preset movement direction A and higher than the parts on both sides, so that the part of the second pressing plate 222 close to the multiple pole tabs 211a presents a "U" shape, so that when the second pressing plate 222 presses the multiple pole tabs 211a, the middle portion can contact and press the pole tabs 211a, and the parts on both sides can gather the roots of the multiple pole tabs 211a to regularize the shapes of the multiple pole tabs 211a from both sides of the multiple pole tabs 211a.

[0145] In other embodiments of the present application, as shown in Figure 8, the second pressing plate 222 can be configured so that its end close to the multiple pole tabs 211a extends toward the welding assembly 300 to bend to form a pressing portion, which is used to press and gather the multiple pole tabs 211a.

[0146] Optionally, the second pressing plate 222 has a second through hole 2123 facing the first pressing plate 212. The second driving component 332 is configured to drive the end of the second welding head 331 to enter the second through hole 2123 or move out of the second through hole 2123.

[0147] Optionally, the second through hole 2123 in the second pressing plate 222 corresponds to one side of the plurality of tabs 211a, so that the second welding head 331 can enter the second through hole 2123 and weld the plurality of tabs 211a to one side thereof.

[0148] With the above arrangement, after the second pressing plate 222 presses and gathers the plurality of tabs 211a, the second driving component 332 drives the second welding head 331 into the second through hole 2123. After the plurality of tabs 211a are shaped, the plurality of tabs 211a can be welded using the second welding head 331. During the welding process, the second pressing plate 222 can continuously press the plurality of tabs 211a, making the plurality of tabs 211a less likely to deform, thereby improving the welding effect of the plurality of tabs 211a.

[0149] In some embodiments of the present application, as shown in Figures 8 and 9, 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 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 tab 211a, and the third mating surface 2223 may be used to press the multiple tabs 211a against the first pressing plate 212.

[0150] 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 more effectively press the multiple pole tabs 211a.

[0151] Optionally, the first mating surface 2221 may be perpendicular to the predetermined direction of motion A, and a portion of the second mating surface 2222 may be arranged at an obtuse angle to the first mating surface 2221. The angle formed by the second mating surface 2222 and the first mating surface 2221 may be as shown by angle α in FIG9 , where 90° < α < 180°. In other words, in the predetermined direction of motion A, the second mating surface 2222 may be arranged at an angle.

[0152] With such a configuration, 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 tabs 21a.

[0153] In some embodiments of the present application, as shown in Figures 4 to 5, the welding assembly 300 may further include a first dust suction unit 340 and a second dust suction unit 350, which are used to suction the welding area of ​​the first welding unit 320 and the welding area of ​​the second welding unit 330 respectively.

[0154] The welding area refers to the area that the welding head can affect when in use. It is the area covered by the heat energy, ultrasonic energy, and other energies emitted by the welding head. Within this welding area, multiple tabs 211a can be welded together. Therefore, vacuuming the welding area of ​​the first welding unit 320 and the welding area of ​​the second welding unit 330 can reduce the occurrence of other metal impurities or tab debris welding multiple tabs 211a in the welding area, thereby improving the welding effect of each tab 211a.

[0155] 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 in the first through hole 2224 of the first pressing plate 212. The first welding head 321 may be disposed on a side of the first dust suction port 341 near the battery cell 20a. The projected area of ​​the first dust suction port 341 in the predetermined direction of motion A may be larger than that of the second welding head 331. This allows the first dust suction port 341 to not only accommodate the first welding head 321 but also provide a dust suction channel. This facilitates the dust suction channel to suction dust from the welding area of ​​the first welding unit 320 when the first welding head 321 is welding the tab 21a.

[0156] Optionally, the second dust suction unit 350 may be provided with a second dust suction port 351, and the second welding head 331 may be disposed on a 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 the second dust suction port 351 not only has space for accommodating the second welding head 331 but also has a dust suction channel. This facilitates the dust suction channel to vacuum the welding area of ​​the second welding unit 330 when the second welding head 331 is welding the tab 21a.

[0157] By setting up the first dust suction unit 340 and the second dust suction unit 350 respectively for the welding area of ​​the first welding unit 320 and the welding area of ​​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 the multiple pole tabs 211a and affects the formation of the pole tab portion 21a.

[0158] In some embodiments of the present application, as shown in Figures 10 and 11, the first driving unit 211 can be configured to drive the first pressing plate 212 in three dimensions. Optionally, the first driving unit 211 can also drive the support frame 310 in three dimensions at the same time.

[0159] 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 .

[0160] Optionally, one of the three-dimensional directions may be a preset motion direction A, so that the support frame 310 can move up and down in the preset motion direction A to approach the battery cell 20a. The other two directions in the three-dimensional direction may be perpendicular to the preset motion 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 forward and backward to approach or move away from the battery cell 20a, thereby facilitating the welding assembly 300 and the first pressing plate 212 to align with the tab 21a of the battery cell 20a, thereby enabling precise pressing and welding of the tab 21a.

[0161] In some embodiments, as shown in Figures 10 and 11, the first drive unit 211 may include a first drive assembly 202, a second drive assembly 203, and a third drive assembly 204. The first drive assembly 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 drive assembly 203 is in transmission connection with the first drive assembly 202, and is used to drive the first drive assembly 202 to move in a second direction. The third drive assembly 204 is in transmission connection with the second drive assembly 203, and is used to drive the second drive assembly 203 to move in a third direction to move closer to or away from the support base 100. The first direction, the second direction, and the third direction are perpendicular to each other.

[0162] As shown in Figures 10 and 11 , the third direction, the second direction, and the first direction may correspond to the three directions X, Y, and Z shown in Figures 10 and 11 , respectively, wherein any two of the three directions X, Y, and Z are perpendicular to each other. The Z direction may be the preset motion direction A.

[0163] Optionally, the first motor 2111 , the first reducer 2112 , the first screw rod 2113 and the first floating joint 2114 in the above embodiment may all be disposed in the first driving assembly 202 .

[0164] Optionally, the second driving assembly 203 may include a second motor 2115 and a second screw rod 2116 , and the third driving assembly 204 may include a third motor 2117 and a third screw rod 2118 .

[0165] The second motor 2115 can be connected to the second screw rod 2116, and the second motor 2115 can be used to provide power to the second screw rod 2116. The second screw rod 2116 can be connected to the support frame 310 and can be used to drive the first drive assembly 202 to perform reciprocating linear motion along a second direction Y perpendicular to the first direction Z.

[0166] The third motor 2117 can be connected to the third screw rod 2118, and the third motor 2117 can be used to provide electric energy to the third screw rod 2118. The third screw rod 2118 can be connected to the support frame 310 and can be used to drive the second drive component 203 to perform reciprocating linear motion along a third direction X perpendicular to the first direction Z and the second direction Y.

[0167] Optionally, as shown in Figures 6 and 11, a first linear slide 360, a second linear slide 370 and a third linear slide 380 may be provided between the support frame 310 and the first drive unit 211. The first linear slide 360 ​​may limit the movement of the support frame 310 in the Z direction, the second linear slide 370 may limit the movement of the support frame 310 in the X direction, and the third linear slide 380 may limit the movement of the support frame 310 in the Y direction.

[0168] In other embodiments, the second driving unit 221 may also be configured to drive the second pressing plate 222 in three-dimensional directions. Of course, in other embodiments, each driving component unit may also be configured to drive the pressing plate or welding head in other directions.

[0169] In some embodiments of the present application, as shown in Figures 10 and 12, the support base 100 may include a conveying track 110 and a battery cell jig 120. The battery cell jig 120 is mounted on the conveying track 110. The conveying track 110 can be used to convey the battery cell jig 120 to the tab pressing structure 200 and to convey the battery cell jig 120 away from the tab pressing structure 200. The battery cell jig 120 can be configured to support and fix the core 22a of the battery cell 20a.

[0170] Optionally, the support base 100 may further include a vertical drive module 130 and a horizontal drive module 140. The vertical drive module 130 may be configured to drive the battery fixture 120 in a first direction Z to move the battery cell 20a, and the horizontal drive module 140 may be configured to drive the battery fixture 120 in a third direction X or a second direction Y to move the battery cell 20a.

[0171] By setting up 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 tab welding mechanism 10, thereby facilitating the welding of the tab sheet 211a.

[0172] In some embodiments of the present application, as shown in FIG13 , a battery assembly system 20 includes the tab welding mechanism 10 in the above embodiment.

[0173] In some embodiments, as shown in FIG1 , a 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. A terminal post 15a may be provided on a wall of the housing 10a opposite the open end 12a. The terminal post 15a may have a through-hole 14a. The housing 10a and the bottom cover 30a are connected to form a receiving cavity 11a that communicates with the through-hole 14a. The active material coating of the battery cell 20a is disposed within the housing 10a. The tab 21a of the battery cell 20a passes through the through-hole 14a and connects to the side of the terminal post 15a facing away from the receiving cavity 11a.

[0174] As shown in Figure 13, the battery assembly system 20 also includes a conveyor 21 and an assembly device 22. The conveyor 21 is used to transport the structures to be assembled to the various workstations of the assembly device 22. The workstations of the assembly device 22 include at least a tab welding mechanism 10. The tab welding mechanism 10 is used to weld multiple tab sheets 211a of the core to form a tab portion 21a.

[0175] 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 motor-driven conveyor roller and a conveyor belt, or a conveying structure formed by a motor-driven conveyor chain link, or an AGV conveyor cart, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0176] The purpose of the tab welding mechanism 10 is to pre-weld a plurality of tab sheets 211 a to form a tab portion 21 a , and an ultrasonic welding device may be selected to ensure that the plurality of tab sheets 211 a are welded in a clamped and stable state.

[0177] In some embodiments, the conveying device 21 can be linked with the conveying track 110 of the tab welding mechanism 10 to transfer 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 can press, gather and weld the tab sheet 211a in the battery cell 20a to form the tab portion 21a.

[0178] 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 tab pressing structure 200 and the welding assembly 300.

[0179] Of course, in other embodiments, when the conveying equipment 21 is a conveyor line 23, the 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 tab welding mechanism 10. The conveyor line 23 can transfer the battery cell 20a to the position of the corresponding tab pressing structure 200 and the welding assembly 300, so that the tab welding mechanism 10 can press, gather and weld the tab sheet 211a in the battery cell 20a to form the tab portion 21a.

[0180] In some embodiments, as shown in FIG13 , the assembly equipment 22 may further include a housing insertion device 24 , a tab insertion device 25 , a pole welding device 26 , and a bottom cover welding device 27 . The conveying device 21 may be used to sequentially convey the battery cell 20 a having the tab portion 21 a formed thereon to the housing insertion device 24 , the tab insertion device 25 , the pole welding device 26 , and the bottom cover welding device 27 .

[0181] The shell insertion device 24 can be used to insert the core 22a into the housing 10a from the open end 12a. The tab insertion device 25 can be used to clamp the tab portion 21a through the through-hole 14a when the core 22a is inserted into the housing 10a. The pole welding device 26 can be used to weld the tab portion 21a passing through the through-hole 14a to the side of the pole 15a facing 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.

[0182] Among them, the shell insertion device 24 can be a pushing mechanism or a clamping mechanism, which can stably move the core 22a toward the open end 12a of the shell 10a and enter the accommodating cavity 11a through the open end 12a. Similarly, the ear insertion device 25 can adopt a clamping structure or a guiding structure, which can guide the ear portion 21a to smoothly pass through the through hole 14a without interfering with the shell 10a. The purpose of the pole welding device 26 is to achieve welding of the ear portion 21a and the pole 15a, and can be optionally a laser welding device. The purpose of the bottom cover welding device 27 is to achieve welding of the circumferential edge of the bottom cover 30a and the open end 12a of the shell 10a, and is also a laser welding device.

[0183] By setting a shell insertion device 24, a pole ear piercing device 25, a pole welding device 26 and a bottom cover welding device 27 in the battery assembly system 20, the process of assembling the battery 1 of 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 battery 1 assembly process can be improved.

[0184] In addition, the assembly equipment 22 is not limited to including the tab welding mechanism 10, the shell insertion device 24, the tab insertion device 25, the pole welding device 26, and the bottom cover welding device 27. For example, when the number of core bodies 22a is multiple, for example, two, the assembly equipment 22 also includes a matching device 28, which is used to stack multiple core bodies 22a so that the tabs 211a of the two core bodies 22a are roughly opposite each other, so that the conveying structure can convey the matched core bodies 22a to the tab welding mechanism 10a for welding the tabs 211a to facilitate the formation of the tab portion 21a. For example, in order to ensure the reliability of the battery 1 assembly process, dust removal, NG detection stations, etc. can also be added between any two adjacent stations, which is not limited in this embodiment.

[0185] According to some embodiments of the application, as shown in Figures 2 to 12, the tab welding mechanism 10 may include a base 11, a support base 100, a tab pressing structure 200, and a welding assembly 300. The support base 100 is disposed on the base 11 to support and secure the core 22a of the battery cell 20a. The tab pressing structure 200 is disposed on the base 11 and is configured to move toward the support base 100 to press and gather the multiple tabs 211a stacked on the battery cell 20a. The welding assembly 300 is disposed on the base 11 and is configured to move toward the support base 100 to weld the gathered multiple tabs 211a to form the tab portion 21a. The tab pressing structure 200 includes a first assembly 210 and a second assembly 220, each movably disposed on the base 11. The first assembly 210 and the second assembly 220 can be configured to be relatively close to or distant 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 the multiple tabs 211a in the clamping cavity 201 to press and gather the multiple tabs 211a. The first component 210 includes a first driving unit 211 and a first pressing plate 212. The first driving unit 211 is mounted on the base 11. The first driving unit 211 can be transmission-connected to the first pressing plate 212. The first driving unit 211 can be configured to drive the first pressing plate 212 toward 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 mounted on the base 11. The second driving unit 221 is configured to drive the second pressing plate 222 toward or away from the support base 100. The first drive unit 211 and the second drive 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 transmission-connected to the first drive unit 211, and the first welding unit 320 and the second welding unit 330 can be installed on the support frame 310. The first welding unit 320 and the second welding unit 330 respectively weld the multiple pole tabs 211a from both sides of the multiple pole tabs 211a. The first welding unit 320 includes a first welding head 321 and a first driving component 322. The first driving component 322 is mounted on the support frame 310. The first welding head 321 is mounted on the first driving component 322. The first driving component 322 is in transmission connection with the first welding head 321. The first driving component 322 can be used to drive the first welding head 321 toward or away from the support base 100. The first pressing plate 212 can have a first through hole 2224 for accommodating pressure toward the second pressing plate 222. The first driving component 322 can be configured to drive the end of the first welding head 321 into or out of the first through hole 2224.And / or, the first pressing plate 212 may further include a blowing structure 2121, wherein 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 air. The second welding unit 330 includes a second welding head 331 and a second driving component 332, wherein the second driving component 332 is transmission-connected to the second welding head 331, and the second driving component 332 is configured to drive the second welding head 331 toward or away from the movable support base 100. 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 of the second welding head 331 into or out of the second through hole 2123. The welding assembly 300 also includes a first dust collection unit 340 and a second dust collection unit 350, respectively configured to vacuum the welding areas of the first welding unit 320 and the second welding unit 330. The first drive unit 211 is configured to drive the first pressing plate 212 in three dimensions. The first drive unit 211 may include a first drive assembly 202, a second drive assembly 203, and a third drive assembly 204. The first drive assembly 202 is transmission-connected to the first pressing plate 212 for driving the first pressing plate 212 to move in a first direction Z. The second drive assembly 203 is transmission-connected to the first drive assembly 202 for driving the first drive assembly 202 to move in a second direction Y. The third drive assembly 204 is transmission-connected to the second drive assembly 203 for driving the second drive assembly 203 to move in a third direction X, toward or away from the support base 100. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other. 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 arranged at an obtuse angle to the first mating surface 2221, and the third mating surface 2223 is arranged to be bent relative to the second mating surface 2222. The first mating surface 2221 is used to press on the core 22a of the battery cell 20a, the second mating surface 2222 is used to cover a portion of the end surface of the core 22a provided with the tab 211a, and the third mating surface 2223 can be used to press the multiple tabs 211a against the first pressing plate 212. The support seat 100 includes a conveying track 110 and a battery cell jig 120. The battery cell jig 120 is installed on the conveying track 110. The conveying track 110 is used to convey the battery cell jig 120 to the tab pressing structure 200 and to convey the battery cell jig 120 away from the tab pressing structure 200. The battery cell jig 120 is configured to support and fix the core body 22 a of the battery cell 20 a .

[0186] In some embodiments of the present application, as shown in Figures 1 and 13, the battery assembly system 20 includes the tab welding mechanism 10 in the above-mentioned 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. The pole 15a may have a through hole 14a. The shell 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 provided 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 cavity 11a through the through hole 14a. The battery assembly system 20 also includes a conveying device 21 and an assembly device 22. The conveying device 21 is used to transport the structure to be assembled to each workstation of the assembly device 22. The workstation 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 the multiple tabs 211a of the core to form the tab portion 21a. The battery assembly system 20 also includes a shell insertion device 24, a tab insertion device 25, a pole welding device 26 and a bottom cover welding device 27. Among them, the conveying equipment 21 can be used to convey the battery cell 20a with the tab portion 21a formed to the shell insertion device 24, the tab insertion device 25, the pole welding device 26 and the bottom cover welding device 27 in sequence. Among them, the shell insertion device 24 is used to load the core 22a into the shell 10a from the open end 12a. The tab insertion device 25 is used to clamp the tab portion 21a through the through hole 14a when the core 22a is loaded into the shell 10a. The pole welding device 26 is used to weld the tab portion 21a passing through the through hole 14a to the side of the pole 15a facing away from the accommodating cavity 11a. The bottom cover welding device 27 is used to weld the bottom cover 30 a to the open end 12 a of the housing 10 a.

[0187] 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. This design enables the tab welding mechanism 10 to not only weld the tab sheets 211a of the battery cell 20a, but also to press and gather the tab sheets 211a before welding to compact the tab sheets 211a, thereby shortening the intervals between the tab sheets 211a to compact the tab sheets 211a, facilitating the welding of the tabs 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 corresponding position of the tab pressing structure 200 or the welding assembly 300, so as to facilitate the press welding of the tab sheets 211a of the battery cell 20a, and also facilitate the transportation of the battery cell 20a to other locations after the tab sheets 211a are pressed and welded to form the tab portion.

[0188] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A tab welding mechanism, characterized in that: include: abutment; A support seat, arranged on the base, for supporting and fixing the core body of the battery cell; A tab pressing structure, disposed on the base, and configured to be able to move toward the support seat, so as to press and gather the multiple tab sheets stacked on the battery core; and The welding assembly is disposed on the base and is configured to be able to move toward the support seat so as to weld the folded plurality of pole tab sheets to form a pole tab portion.

2. The tab welding mechanism according to claim 1, characterized in that: The tab pressing structure includes a first component and a second component which are respectively movably arranged on the base, the first component and the second component are configured to be able 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 the multiple tab sheets in the clamping cavity to press and gather the multiple tab sheets.

3. The tab 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 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 to move closer to or away from the support seat.

4. The tab 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 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 approach or move away from the support seat; The first driving unit and the second driving unit are respectively located on both sides of the supporting seat, so that the first component and the second component can be relatively close to or far away from each other to form the clamping cavity with adjustable size.

5. The tab 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 transmission-connected to 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.

6. The tab 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 transmission-connected to the first welding head and is used to drive the first welding head to approach or move away from the support seat.

7. The tab 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 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 also 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, for smoothing the pole ear sheet by blowing.

8. The tab welding mechanism according to claim 5, characterized in that: The second welding unit includes a second welding head and a second driving component, the second driving component is installed on the support frame, and the second driving component is transmission-connected to 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, characterized in that: 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.

10. The tab welding mechanism according to claim 5, characterized in that: The welding assembly further includes a first dust suction unit and a second dust suction unit, wherein the first dust suction unit and the second dust suction unit are used to suction the welding area of ​​the first welding unit and the welding area of ​​the second welding unit, respectively.

11. The tab welding mechanism according to claim 3, characterized in that: The first driving unit is configured to drive the first pressing plate in a three-dimensional direction.

12. The tab welding mechanism according to claim 11, characterized in that: The first driving unit includes a first driving assembly, a second driving assembly and a third driving assembly; the first driving assembly is transmission-connected to the first pressing plate, and is used to drive the first pressing plate to move along a first direction; the second driving assembly is transmission-connected to the first driving assembly, and is used to drive the first driving assembly to move along a first direction; The third driving assembly is connected to the second driving assembly in a transmission manner and is used to drive the second driving assembly to move along the third direction to approach or move away from the support seat; The first direction, the second direction and the third direction are perpendicular to each other.

13. The tab welding mechanism according to claim 4, characterized in that: The second pressing plate comprises 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 to press on the core body of the battery cell, the second mating surface is used to cover a portion of the end surface of the battery cell provided with the pole tabs, and the third mating surface is used to press the plurality of pole tabs onto the first pressing plate.

14. The tab welding mechanism according to any one of claims 1 to 13, characterized in that: 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, 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, 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, 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.

Images