Tab welding mechanism and battery assembly system

Abstract

This application discloses a tab welding mechanism and a battery assembly system, the tab welding mechanism comprising a base, a support base, a tab pressing structure, and a welding assembly, the support base being mounted on the base and used to support and fix the core body of the battery core, the tab pressing structure being mounted on the base and movably positioned toward the support base to press and converge a plurality of tab sheets stacked on the battery core, and the welding assembly being mounted on the base and movably positioned toward the support base to weld the converged plurality of tab sheets to form a tab portion. With this method, this application can solve the problem of the high difficulty of the tab welding process and improve the yield rate of batteries.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 2023116436946, filed on November 30, 2023, entitled “Tab Welding Mechanism and Battery Assembly System,” the entirety of which is incorporated herein by reference.

[0002] This application relates to the battery technology field, and more particularly to tab welding mechanisms and battery assembly systems. [Background technology]

[0003] A battery refers to a portion of the space within a cup, tank, or other container or composite container that houses an electrolyte solution and metal electrodes to generate current, and can convert chemical energy into electrical energy. With technological advancements, batteries, which are easy to carry, easy to charge and discharge, and can provide stable power for long periods, are widely used in fields such as automobiles, home appliances, and aerospace.

[0004] In conventional technology, to facilitate welding the tab portion to the electrode post during battery assembly, it is necessary to weld and fix tab sheets drawn from the positive and negative electrodes in the connected battery core to form the tab portion. However, because the welding process for the tab sheets is complex, the difficulty of battery manufacturing is relatively high, and the yield rate of good batteries decreases. [Overview of the project]

[0005] In view of the above problems, this application provides a tab welding mechanism and a battery assembly system that can solve the problem of the high difficulty of the tab welding process and improve the yield rate of batteries.

[0006] In a first aspect, the present application provides a tab welding mechanism comprising a base, a support, a tab pressing structure, and a welding assembly. The support is mounted on the base and used to support and fix the core body of a battery core; the tab pressing structure is mounted on the base and movably positioned toward the support to press and converge a plurality of tab sheets stacked on the battery core; and the welding assembly is mounted on the base and movably positioned toward the support to weld the converged plurality of tab sheets to form a tab portion.

[0007] In the embodiment of the present invention, the base is equipped not only with a welding mechanism, but also with a support base and a tab pressing structure. With this design, the tab welding mechanism can weld the tab sheets of the battery core, and the tab pressing structure can be used to press and converge the tab sheets before welding. This shortens the spacing between the tab sheets, compresses the tab sheets, makes welding the tabs easier, reduces the difficulty of welding, and improves the yield rate of the battery core. The support base can transport the battery core to a position corresponding to the tab pressing structure or welding assembly to facilitate pressing and welding the tab sheets of the battery core, and also facilitates transporting the battery core to other positions after the tab sheets have been pressed and welded to form the tab portion.

[0008] In some embodiments, the tab pressing structure includes a first assembly and a second assembly, each movably mounted on a base. The first and second assemblies are positioned to be relatively close or far apart, and when relatively close, they can form a clamping cavity, which is used to clamp multiple tab sheets within the clamping cavity so as to press and converge the multiple tab sheets.

[0009] By fitting the first assembly and the second assembly together and positioning them so that they are relatively close or far apart, the tab pressing structure can easily contain the tab sheet within the clamping cavity and facilitate the compression of the tab sheet by pressing and converging it, thereby facilitating the subsequent welding of the tab sheet.

[0010] In some embodiments, the first assembly includes a first drive unit and a first pressing plate, the first drive unit being mounted on a base and power-driven to the first pressing plate, and positioned to drive the first pressing plate toward or toward a support base.

[0011] The first drive unit is installed to drive a first pressing plate to move it closer to or away from the core body of the battery core on the support base, thereby allowing the first pressing plate to easily press and converge the tab sheet on the battery core, and after the first pressing plate presses and converges the tab sheet, it can be easily driven away from the tab portion by the first drive unit, thereby preventing the first pressing plate from affecting the movement of the battery core.

[0012] In some embodiments, the second assembly includes a second drive unit and a second pressing plate, the second drive unit being mounted on a base and power-driven to the second pressing plate, and positioned to drive the second pressing plate toward or toward a support base. The first and second drive units are located on either side of the support base, respectively, allowing the first and second assemblies to move toward or toward each other, thereby forming a dimensionally adjustable clamping cavity.

[0013] The second drive unit is positioned to drive a second pressing plate to move closer to or away from the support base in order to move the battery core on the support base, thereby forming a dimensionally adjustable clamping cavity between the first and second assemblies, and the first and second pressing plates can easily fit together to press and converge both sides of the multiple tab sheets of the battery core, thereby crimping the multiple tab sheets.

[0014] In some embodiments, the welding assembly includes a support frame, a first welding unit, and a second welding unit. The support frame is power-driven to a first drive unit, and the first and second welding units are mounted to the support frame, with each welding unit welding multiple tab sheets from both sides of the multiple tab sheets.

[0015] By attaching the first and second welding units to the support frame, the first drive unit can simultaneously drive the first and second welding units to approach the tab sheet. By using the two welding units to weld both sides of the tab sheet simultaneously, the weld of the tab sheet can be made stronger, thereby improving the welding effect of the tab sheet and increasing the welding efficiency of the tab sheet.

[0016] In some embodiments, the first welding unit includes a first welding head and a first drive member, the first drive member being mounted on a support frame and power-driven to the first welding head, and used to drive the first welding head toward or away from a support base.

[0017] By installing the first drive member to be electrically connected to the first welding head, the first welding head can move independently through the transmission of the first drive member, making it easier for the first welding unit to adjust its position and align with one side of multiple tab sheets, thereby achieving accurate welding.

[0018] In some embodiments, the first pressing plate has a first through hole for facing the second pressing plate, and the first driving member is arranged to drive the end of the first welding head to enter or exit the first through hole. And / or, the first pressing plate further includes a blowing structure, and the air outlet of the blowing structure is installed on the side of the first pressing plate facing the second pressing plate and is used to flatten the tabs by blowing.

[0019] By providing the first through hole of the first pressing plate through which the end of the first welding head can enter and exit, the first welding head can weld the plurality of tab sheets after the first pressing plate converges and presses the plurality of tab sheets, and during the welding process, the first pressing plate can fix the plurality of tab sheets so that the tab sheets are not easily deformed, thereby facilitating the first welding head to weld one side of the plurality of tab sheets. Installing the blowing structure and flattening the tabs by blowing can make the shape of the tabs more regular.

[0020] In some embodiments, the second welding unit includes a second welding head and a second driving member. The second driving member is attached to the support frame and is transmission-connected to the second welding head and is used to drive the second welding head to approach or leave the support base.

[0021] By providing that the second driving member is transmission-connected to the second welding head, the second welding head can achieve independent movement by the transmission of the second driving member, and it is easier for the second welding unit to adjust its position and align with one side of the plurality of tab sheets, thereby realizing accurate welding.

[0022] In some embodiments, the second pressing plate has a second through hole for facing the first pressing plate, and the second driving member is arranged to drive the end of the second welding head to enter or exit the second through hole.

[0023] By providing a second communication hole in the second pressing plate through which the end of the second welding head can enter and exit, the second welding head can weld multiple tab sheets after the second pressing plate has brought multiple tab sheets together and pressed them together, and during the welding process, the second pressing plate can fix the multiple tab sheets in such a way that the tab sheets are less likely to deform, thereby making it easier for the second welding head to weld one side of the multiple tab sheets.

[0024] In some embodiments, the welding assembly further includes a first dust collection unit and a second dust collection unit used to collect dust from the welding area of ​​a first welding unit and the welding area of ​​a second welding unit, respectively.

[0025] By installing the first dust collection unit and the second dust collection unit in the welding area of ​​the first welding unit and the welding area of ​​the second welding unit, respectively, debris and dust generated in the welding area can be absorbed, making it less likely for debris and dust to be adsorbed onto the tab portion, thus minimizing the impact on the use of the tab portion and subsequent processing processes.

[0026] In some embodiments, the first drive unit is arranged to drive the first pressing plate in a three-dimensional direction.

[0027] By arranging the first pressing plate to be movable in three directions in three dimensions, the first pressing plate can easily and accurately position the tab sheet and further help to press and converge the tab sheet.

[0028] 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 powered to a first pressure plate and is used to drive the first pressure plate to move along a first direction. The second drive assembly is powered to the first drive assembly and is used to drive the first drive assembly to move along a second direction. The third drive assembly is powered to the second drive assembly and is used to drive the second drive assembly to move along a third direction, thereby moving it closer to or further away from a support base. Of these, the first, second, and third directions are perpendicular to each other in pairs.

[0029] By installing different drive assemblies in different directions and sequentially connecting them, it is possible to achieve coordinated motion between the three drive assemblies, making it easy to drive the first pressure plate to move in three directions.

[0030] 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 and the first mating surface are set at an obtuse angle, and the third mating surface is set bent relative to the second mating surface. The first mating surface is used to press against the core body of the battery core, the second mating surface is used to cover a portion of the end face of the battery core where the tab sheet is provided, and the third mating surface is used to press the multiple tab sheets against the first pressing plate.

[0031] By installing the core body of the battery core and three mating surfaces suitable for multiple tab sheets on the second pressing plate, the second pressing plate can be easily positioned to correspond to multiple tab sheets based on the core body of the battery core, and can more effectively press and converge multiple tabs.

[0032] In some embodiments, the support base includes a transport rail and a battery core fixture, the battery core fixture being mounted on the transport rail, and the transport rail being used to transport the battery core fixture to and from the tab pressing structure. The battery core fixture is positioned to support and secure the core body of the battery core.

[0033] By installing a transport rail and a battery core jig, the battery core can be easily fixed to the transport rail, preventing it from slipping off, and the battery core can be easily transported to the corresponding welding work station of the tab welding mechanism, thereby facilitating the welding of the tab sheet.

[0034] In a second aspect, the present application provides a battery assembly system including the tab welding mechanism in the above embodiment.

[0035] In some embodiments, the battery includes a casing, a bottom cover, and a battery core. The casing has an open end, and pole columns are installed in the wall opposite the open end of the casing. The pole columns have communication holes, and the casing and bottom cover are connected to form a housing cavity that communicates with the communication holes. The active material coated portion of the battery core is installed inside the casing, and the tab portion of the battery core is connected to the side that passes through the communication holes and is away from the housing cavity of the pole columns. The battery assembly system further includes a transporter and an assembly equipment, the transporter being used to transport the structures to be assembled to each work station of the assembly equipment. The work stations of the assembly equipment include at least a tab welding mechanism, the tab welding mechanism being used to weld multiple tab sheets of the battery core to form tab portions.

[0036] By installing a tab welding mechanism within the battery assembly system, multiple tab sheets of the battery core can be welded together to form tab sections. This makes welding the tab sheets easier, reduces the difficulty of welding, and improves the yield rate of good batteries.

[0037] In some embodiments, the assembly equipment's work station further includes a casing insertion device, a tab penetration device, a pole column welding device, and a bottom cover welding device. Of these, the conveying equipment is used to sequentially convey the battery core with the tab portion formed to the casing insertion device, the tab penetration device, the pole column welding device, and the bottom cover welding device. Of these, the casing insertion device is used to insert the battery core into the casing from the open end. The tab penetration device is used to grip the tab portion and penetrate the communication hole when inserting the battery core into the casing. The pole column welding device is used to weld the tab portion that has penetrated the communication hole to the side of the pole column that is away from the housing cavity. The bottom cover welding device is used to weld the bottom cover to the open end of the casing.

[0038] By installing a casing insertion device, tab penetration device, pole column welding device, and bottom cover welding device within the battery assembly system, the battery assembly flow by the battery assembly system can be made smoother, the battery assembly flow can be simplified, and the standardization and intelligence of the battery assembly flow can be improved.

[0039] The above description is merely an outline of the proposed technology. In order to better understand the technical means of this application and to implement them in accordance with the specifications, and to better understand the above and other objectives, features, and advantages of this application, specific embodiments of this application are listed below. [Brief explanation of the drawing]

[0040] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiments below. The drawings are for illustrative purposes only and should not be considered limiting to the present application. In addition, the same reference numerals are used for the same components in all drawings. In the figures, [Figure 1] This is a schematic diagram of the structure of a battery cell according to several embodiments of the present invention. [Figure 2] This is a schematic diagram of a partial structure of a tab welding mechanism according to several embodiments of the present invention. [Figure 3] Figure 2 is a schematic diagram of a partial structure according to an embodiment of the tab welding mechanism shown in Figure 2, from a different perspective. [Figure 4] Figure 2 is a schematic enlarged view of region O according to an embodiment of the tab welding mechanism shown in Figure 2. [Figure 5] Figure 3 is a schematic enlarged view of region P according to an embodiment of the tab welding mechanism shown in Figure 3. [Figure 6] This is a schematic diagram of another substructure of a tab welding mechanism according to several embodiments of the present application. [Figure 7] This is a schematic diagram of the structure of a second assembly in a tab welding mechanism according to several embodiments of the present application. [Figure 8] This is a schematic diagram of the structure of a partial region in a tab welding mechanism according to several other embodiments of the present application. [Figure 9] This is a schematic diagram of the side structure of the second pressing plate in the embodiment of the tab welding mechanism shown in Figure 8. [Figure 10] This is a schematic diagram of the overall structure of a tab welding mechanism according to several embodiments of the present invention. [Figure 11] This is a schematic diagram of the structure of the first drive unit in a tab welding mechanism according to several embodiments of the present application. [Figure 12] This is a schematic diagram of the structure of the support base in a tab welding mechanism according to several embodiments of the present invention. [Figure 13]This is a schematic block diagram of the structure of a battery assembly system according to several embodiments of the present application. The reference numerals in the drawings for the specific embodiments are as follows: Battery 1, casing 10a, battery core 20a, housing cavity 11a, communication hole 14a, tab 21a, pole post 15a, open end 12a, bottom cover 30a, core body 22a, Tab welding mechanism 10, base 11, support base 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 reduction gear 2112, first lead 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 member 322, first communication hole 2224, first cylinder 3221, blower structure 2121, air outlet 2122, second welding head 331 , second drive member 332, second cylinder 3321, second communication hole 2123, first dust collection unit 340, second dust collection unit 350, first dust collection port 341, second dust collection port 351, first drive assembly 202, second drive assembly 203, third drive assembly 204, second motor 2115, second lead screw 2116, third motor 2117, third lead screw 2118, first straight slide rail 360, second straight slide rail 370, third straight slide rail 380, first mating surface 2221, second mating surface 2222, third mating surface 2223, transport rail 110, battery core jig 120, vertical drive module 130, horizontal drive module 140, Battery assembly system 20, conveying equipment 21, assembly equipment 22, conveying line 23, casing insertion device 24, tab penetration device 25, pole column welding device 26, and bottom cover welding device 27. [Modes for carrying out the invention]

[0041] The following describes in detail embodiments of the present invention, with reference to the drawings. The following embodiments are provided solely for the purpose of clarifying the present invention and should be used only as examples; they should not be used to limit the scope of the claims of this invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the field of this application. The terms used herein are for illustrative purposes only and not to limit this application. The terms “including” and “having” and any variations thereof in the description, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as “first,” “second,” etc., are merely used to distinguish different subjects, and should not be understood as indicating or implying relative importance, or implicitly indicating the quantity, specific order, and priority of the technical features being referred to. In the description of the embodiments of this application, “multiple” means two or more unless otherwise clearly and specifically limited.

[0044] As used herein, “Examples” means that any particular feature, structure, or characteristic described in conjunction with an Example may be included in at least one Example of the Application. Each occurrence of such phrase in the Specification does not necessarily refer to the same Example, nor do they represent mutually exclusive, independent, or substitutable Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein may be combined with other Examples.

[0045] In the description of the embodiments of this application, the term "and / or" simply describes a related relationship that describes related objects, and indicates that there can be three types of relationships. For example, A and / or B can represent three cases: A existing only, A and B existing simultaneously, and B existing only. In this specification, the symbol " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more sheets (including two).

[0047] In the description of the embodiments of this application, the orientations or positional relationships indicated by technical terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings and are merely for the purpose of describing and simplifying the embodiments of this application. They do not indicate or imply that the shown devices or elements necessarily have a specific orientation, are composed of a specific orientation, or must be operated in a specific orientation, and therefore should not be understood as limiting the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise specifically defined and limited, technical terms such as “attachment,” “connection,” “joining,” and “fixing” should be understood in a broad sense, for example, they may be fixed connections, removable connections, or integrated connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, or internal communication between two elements or an interaction relationship between two elements. Those skilled in the art may understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

[0049] With advancements in battery technology, battery cells are being applied to an increasing number of fields and are gradually replacing conventional fossil fuel sources in the automotive powertrain. Battery cells can store chemical energy and controllably convert that chemical energy into electrical energy. Recyclable battery cells can be used continuously by recharging after discharge to reactivate the active material.

[0050] In conventional technology, to facilitate welding the tab portion to the electrode post during battery assembly, it is necessary to weld and fix the tabs drawn from the positive and negative electrodes in the connected battery core to form the tab portion. However, the welding process for the tabs is complex, making battery manufacturing relatively difficult and reducing the yield rate of good batteries. In particular, when multiple electrode assemblies are stacked to form a battery core, it is necessary to weld the tabs of the multiple battery cores together, but the multiple tabs of multiple electrode assemblies often have large slits, which can lead to problems such as insufficient welding strength.

[0051] To simplify the tab welding process and improve welding efficiency and battery yield, the battery core can be positioned and the tabs fixed before welding, and the tabs can be pressed and compressed to form the tab portion before welding, and then the tab portion and the pole column can be welded together.

[0052] 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, a tab pressing structure, and a welding assembly. The support is mounted on the base and used to support and fix the core body of the battery core. The tab pressing structure is mounted on the base and is movably positioned toward the support to press and converge a plurality of tab sheets stacked on the battery core. The welding assembly is mounted on the base and is movably positioned toward the support to weld the converged plurality of tab sheets to form a tab portion.

[0053] In the embodiment of the present invention, the tab welding mechanism not only has a welding mechanism installed on a base, but also a support base and a tab pressing structure. With this design, the tab welding mechanism can not only weld the tab sheets of the battery core, but also press and converge the tab sheets before welding, shortening the spacing between the tab sheets and compressing them, making it easier to weld the tab sheets, thereby reducing the difficulty of welding and improving the yield rate of the battery core. The support base can transport the battery core to a position corresponding to the tab pressing structure or welding assembly, making it easier to transport the battery core to another position after the tab sheets of the battery core have been pressed and welded to form the tab portion, and after the tab sheets have been pressed and welded.

[0054] The following explanation will use battery 1 as an example.

[0055] As shown in Figure 1, Battery 1 refers to a portion of the space in a cup, tank, or other container or composite container that houses an electrolyte solution and metal electrodes to generate an electric current, and is a device that can convert chemical energy into electrical energy. Battery 1 may also be a battery pack or an energy storage device. An energy storage device includes an energy storage container, an energy storage electrical cabinet, and the like.

[0056] In some embodiments, the battery 1 may include a casing 10a, a bottom cover 30a, and a battery core 20a. Of course, the battery 1 may further include other functional components.

[0057] Specifically, the casing 10a may have an open end 12a, and pole columns 15a may be installed on the wall opposite the open end 12a of the casing 10a, and pole columns 15a may have a communication hole 14a, and the casing 10a and the bottom cover 30a are connected to form a housing cavity 11a that communicates with the communication hole 14a. The active material coated portion of the battery core 20a is installed inside the casing 10a, and the tab portion 21a of the battery core 20a is connected to the side of the pole column 15a that is separated from the housing cavity 11a by passing through the communication hole 14a.

[0058] In some embodiments, the casing 10a is used to enclose components such as the battery core 20a and the electrolyte.

[0059] The battery core 20a is a component that undergoes an electrochemical reaction in the battery 1. The battery core 20a may also be called an electrode assembly. The casing 10a may contain one or more battery cores 20a. A tab portion 21a may be provided at one end of the battery core 20a, the battery core 20a is located inside the housing cavity 11a, and the tab portion 21a penetrates the inside of the communication hole 14a.

[0060] Selectively, the battery 1 may further include a bottom cover 30a used to cover the open end 12a so that the battery core 20a is less likely to fall out of the open end 12a after it has been placed in the casing.

[0061] The bottom cover 30a may be a component that covers the open end 12a of the casing 10a to isolate the internal environment of the battery 1 from the external environment. The shape of the bottom cover 30a may, but is not limited to, conform to the shape of the open end 12a so as to fit into the casing 10a. Optionally, the bottom cover 30a may be manufactured from a material having a certain hardness and strength (e.g., an aluminum alloy), in which case the bottom cover 30a is less likely to deform when subjected to pressure and impact, the battery 1 can have higher structural strength, and its safety performance can be improved to some extent.

[0062] The pole post 15a may be installed on the top 13a of the casing 10a. The pole post 15a may be used to electrically connect to the battery core 20a in order to output or input electrical energy from the battery 1. In some embodiments, the casing 10a may be further equipped with a pressure release mechanism to release internal pressure when the internal pressure or temperature of the battery 1 reaches a threshold.

[0063] The casing 10a is an assembly used to form the internal environment of the battery 1 by fitting with the bottom cover 30a, and the formed internal environment may be used to house the battery core 20a, electrolyte, and other components. The casing 10a and the bottom cover 30a may be independent components, or an open end 12a may be installed on the casing 10a, and the bottom cover 30a covers the open end 12a to form the internal environment of the battery 1. In other embodiments, the shape of the casing 10a may be determined according to the specific shape and dimensions of the battery core 20a. The material of the casing 10a may be of multiple types, including, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0064] In some embodiments, the battery core 20a is provided with a tab portion 21a and a core body 22a, the tab portion 21a from which current can be drawn out of the core body 22a. The tab portion 21a includes a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab may both be located at one end of the core body 22a, or they may be located at both ends of the core body 22a, respectively. During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 21a is connected to the electrode pole 15a to form a current loop.

[0065] Selectively, the tab portion 21a may be formed by welding a plurality of tab sheets 211a. Of these, the plurality of tab sheets 211a may be installed as copper or aluminum flakes corresponding to the positive or negative electrode tab. Of course, in other embodiments, the tab sheets 211a may be made of metallic materials such as silver flakes or nickel flakes.

[0066] In some embodiments, the core body 22a includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery core 20a, active ions (e.g., lithium ions) repeatedly insert into and remove from between the positive and negative electrodes. The separator is placed between the positive and negative electrodes and can prevent a short circuit between them while simultaneously allowing the passage of active ions.

[0067] In some embodiments, the positive electrode may be a positive electrode piece that includes a positive electrode current collector and a positive electrode active material placed on at least one surface of the positive electrode current collector.

[0068] For example, the positive electrode current collector has two opposing surfaces in its thickness direction, and the positive electrode active material is placed on one or both of the two opposing surfaces of the positive electrode current collector.

[0069] As an example, the positive electrode current collector can 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 electrodes, carbon, nickel, or titanium can 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 (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer material base (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0070] As an example, the positive electrode active material can include at least one of materials such as lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of Battery 1 may also be used. These positive electrode active materials may be used alone as only one type, or in combination of two or more types. Among them, examples of lithium-containing phosphates may include lithium iron phosphate (e.g., LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon, but are not limited thereto. Examples of lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which may also be abbreviated as NCM 333 ), LiNi 0.5 Co[[ID=ll]] 0.2 Mn 0.3 O2 (which may also be abbreviated as NCM[[ID=1S]] 523 ), LiNi 0.5 Co[[ID=lf]] 0.25 Mn 0.25 O2 (which may also be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which may also be abbreviated as NCM 622 i ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may also be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (e.g., LiNi 0.85 Co 0.15 Al 0.05It may contain, but is not limited to, at least one of O2 and its modified compounds.

[0071] In some embodiments, the negative electrode may be a negative electrode piece that includes a negative electrode current collector.

[0072] As an example, the negative electrode current collector can be a metal foil, foamed metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector is formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base (a base material such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0073] As an example, the negative electrode piece may include a negative electrode current collector and a negative electrode active material placed on at least one surface of the negative electrode current collector.

[0074] For example, the negative electrode current collector has two opposing surfaces in its thickness direction, and the negative electrode active material is placed on one or both of the two opposing surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material can be a negative electrode active material for a battery core 20a known in the art. For 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. The silicon-based material may be selected from at least one of elemental silicon, silicon oxygen 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 oxygen compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials usable as negative electrode active materials for batteries may be used. These negative electrode active materials may be used individually or in combination of two or more.

[0076] 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.

[0077] In some embodiments, the core body 22a further includes a separator placed between the positive electrode and the negative electrode.

[0078] In some embodiments, the separator is a separator film. The present application does not impose any particular restrictions on the type of separator film, and any known porous separator film having good chemical and mechanical stability can be selected.

[0079] As an example, the main material of the separator film may be at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator film may be a single-layer film or a multi-layer composite film, and there are no particular restrictions. If the separator film is a multi-layer composite film, the materials of each layer may be the same or different, and there are no particular restrictions. The separator may be a single component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0080] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes and serves to transport ions and separate the positive and negative electrodes.

[0081] In some embodiments, the battery core 20a further includes an electrolyte that plays a role in conducting ions between the positive and negative electrodes. The present application is not specifically limited to the type of electrolyte, which can be selected according to the needs. The electrolyte may be in a liquid state, a gel state, or a solid state.

[0082] Of these, the liquid electrolyte includes an electrolyte salt and a solvent.

[0083] In some embodiments, the electrolyte salt may be at least one selected from lithium hexafluoride phosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoride arsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxaletborate, lithium difluorobisoxalatrate, and lithium tetrafluorooxalatrate.

[0084] In some embodiments, the solvent may be at least one selected from ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may be an ether-based solvent. The ether-based solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0085] Among these, the gel-like electrolyte contains a polymer-based skeletal network and is combined with an ionic liquid-lithium salt.

[0086] Among these, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0087] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid lithium salt, cellulose, etc.

[0088] As an example, the inorganic solid electrolyte may be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, argyrodite), amorphous sulfide), as well as halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0089] For example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0090] In some embodiments, the core body 22a is a wound structure. The positive electrode piece and the negative electrode piece are wound in the wound structure. In some other embodiments, the core body 22a may be a laminated structure, i.e., a laminated structure formed by stacking the positive electrode piece and the negative electrode piece.

[0091] This invention provides a tab welding mechanism 10 used for welding tab sheets 211a of a battery core 20a. Exemplarily, the welding process is a pre-welding process that employs an ultrasonic welding process in correspondence.

[0092] As shown in Figures 2 and 5, the tab welding mechanism 10 may include a base 11, a support base 100, a tab pressing structure 200, and a welding assembly 300.

[0093] Of these, the support base 100 may be installed on the base 11 and used to support and fix the core body 22a of the battery core 20a. The tab pressing structure 200 may be installed on the base 11 and movably positioned toward the support base 100 to press and converge a plurality of tab sheets 211a stacked on the battery core 20a. The welding assembly 300 may be installed on the base 11 and movably positioned toward the support base 100 to weld the converged plurality of tab sheets 211a to form a tab portion 21a.

[0094] Selectively, the positions where the tab pressing structure 200 is installed on the base 11 and the positions where the welding assembly 300 is installed on the base 11 may correspond to the positions of the support base 100. When the support base 100 transports the core body 22a of the battery core 20a to the position corresponding to the tab pressing structure 200, the tab pressing structure 200 can move toward the tab sheet 211a of the battery core 20a on the support base 100 and is used to press and converge the tab sheet 211a of the battery core 20a. The welding assembly 300 can weld the tab sheet 211a, thereby forming a press welding work station at the position corresponding to the tab pressing structure 200 and the welding assembly 300 on the support base 100.

[0095] When installed in this manner, the support base 100 can transport the battery core 20a to a press-welding work station corresponding to the tab press structure 200 or welding assembly 300 so that the tab sheet 211a of the battery core 20a can be pressed and welded, and after the tab portion 21a is formed by pressing and welding the tab sheet 211a, the battery core 20a can be easily transported to another location.

[0096] Since the tab sheet 211a of the battery core 20a is formed by stacking the metal leads of the negative and positive electrodes in the battery core 20a, when the tab pressing structure 200 and the welding assembly 300 are installed in the same position, the tab welding mechanism 10 can not only weld the tab sheet 211a of the battery core 20a, but also press and converge the tab sheet 211a before welding, thereby shortening the spacing between the tab sheets 211a and compressing them, making it easier to weld the tab sheet 211a, thereby reducing the difficulty of welding and improving the yield rate of the battery core 20a.

[0097] In some embodiments of the present application, as shown in Figures 2 and 5, the tab pressing structure 200 may include a first assembly 210 and a second assembly 220, which are movably mounted on a base 11, respectively. The first assembly 210 and the second assembly 220 may be positioned to be relatively close or far apart. When the first assembly 210 and the second assembly 220 are relatively close, they can form a clamping cavity 201, and the first assembly 210 and the second assembly 220 are used to clamp a plurality of tab sheets 211a within the clamping cavity 201 so as to press and converge the plurality of tab sheets 211a.

[0098] Selectively, the first assembly 210 and the second assembly 220 can move closer to or further away from each other in a predetermined direction of movement. When the tab sheet 211a is transported by the support base 100 to the press welding work station position, it can be positioned between the first assembly 210 and the second assembly 220 in a predetermined direction of movement, with one side of the tab 21a facing the first assembly 210 and the other side facing the second assembly 220. The predetermined direction of movement may be as indicated by arrow A in the figure.

[0099] A clamping cavity 201 is formed when the first assembly 210 and the second assembly 220 approach each other, and the multiple tab sheets 211a are located in the clamping cavity 201, thereby clamping the multiple tab sheets 211a by fitting together and pressing them together as the first assembly 210 and the second assembly 220 approach each other.

[0100] With the above configuration, the first assembly 210 and the second assembly 220 can be relatively close to or far apart, the tab pressing structure 200 can easily contain the tab sheet 211a within the clamping cavity 201, and by pressing and converging the tab sheet 211a, the tab sheet 211a can be easily crimped, thereby facilitating subsequent welding of the tab sheet 211a.

[0101] In some embodiments of the present application, as shown in Figures 2 to 4, the first assembly 210 may include a first drive unit 211 and a first pressing plate 212, the first drive unit 211 may be mounted on the base 11, or it may be drive-connected to the first pressing plate 212, or it may be positioned to drive the first pressing plate 212 toward or toward the support base 100.

[0102] The first drive unit 211 is configured to drive the first pressing plate 212 to move closer to or away from the core body 22a of the battery core 20a on the support base 100. As a result, the first pressing plate 212 can easily press and converge the tab sheet 211a on the core body 22a, and after the tab sheet 211a is pressed, the first drive unit 211 can be used to drive the first pressing plate 212 to move it away from the tab sheet 211a, thereby preventing the first pressing plate 212 from affecting the movement and transport of the battery 1.

[0103] Selectively, as shown in Figure 6, the first drive unit 211 may include a first motor 2111, a first gearbox 2112, a first lead screw 2113, and a first floating joint 2114. Of these, the first gearbox 2112 may be connected to the first motor 2111, the first lead screw 2113 may be connected to the first gearbox 2112, and the first floating joint 2114 may be connected to the first lead screw 2113.

[0104] Specifically, the first motor 2111 is a power supply device for providing electrical energy to the other components of the first drive unit 211. The first reduction gear 2112 is a reduction transmission device used to match the rotational speed between the first motor 2111 and the first lead screw 2113 and transmit torque. The first lead screw 2113 is a motion mechanism capable of transmitting linear motion, thereby allowing the first drive unit 211 to drive the first pressure plate 212 to move away from or towards the tab sheet 211a. The first floating joint 2114 is used to connect the first lead screw 2113 and the first pressure plate 212, thereby allowing the first lead screw 2113 to drive and move the first pressure plate 212.

[0105] With the above configuration, when the first drive unit 211 is arranged as a lead screw drive, the first drive unit 211 can drive the first pressing plate 212 more quickly and move the first pressing plate 212 more accurately, thereby aligning the first pressing plate 212 with the tab sheet 211a, and the tab pressing structure 200 can complete the pressing convergence process against the tab sheet 211a quickly and accurately.

[0106] In some embodiments of the present application, as shown in Figures 2 to 7, the second assembly 220 may include a second drive unit 221 and a second pressing plate 222, the second drive unit 221 may be mounted on the base 11 and may be arranged to drive the second pressing plate 222 to move closer to or away from the support base 100 in order to move closer to or away from the battery core 20a on the support base 100.

[0107] Of these, the first drive unit 211 and the second drive unit 221 are located on either side of the support base 100, respectively, and the first assembly 210 and the second assembly 220 can be brought closer or further apart relative to each other, thereby forming a dimensionally adjustable clamping cavity 201.

[0108] For example, when the first drive unit 211 and the second drive unit 221 drive the first assembly 210 and the second assembly 220, respectively, to gradually bring them closer together, the dimensions of the clamping cavity 201 gradually decrease, and the first assembly 210 and the second assembly 220 further clamp and converge the tab sheet 211a within the clamping cavity 201. After the tab sheet 211a is crimped, the first assembly 210 and the second assembly 220 move further apart relative to each other, and the dimensions of the clamping cavity 201 increase further and further.

[0109] With the above setup, the first drive unit 211 and the second drive unit 221 drive the first assembly 210 and the second assembly 220 to move closer to each other, engage with each other, press and converge the tab sheet 211a, and improve the crimping effect of the tab sheet 211a.

[0110] Selectively, as shown in Figures 2 and 7, the second drive unit 221 may include a cylinder 2211 connected to the second pressing plate 222, wherein the cylinder 2211 is a cylindrical device that guides a piston to move linearly back and forth within the cylinder. Thus, the cylinder 2211 is installed and connected to the second pressing plate 222, and the cylinder 2211 can drive the second pressing plate 222 to move linearly back and forth toward or away from the support base 100, thereby achieving pressing and shaping of the tab sheet 211a. The cylinder 2211 has features such as a simple structure, low cost, suitability for driving other elements to move reciprocating linearly, and being particularly suitable for parallel transport of products and workpieces. By using the cylinder 2211, the pressing and converging process of the tab sheet 211a can be standardized and systematized, the cost of the tab pressing structure 200 can be reduced, and the reliability of the tab pressing structure 200 can be improved.

[0111] In some embodiments of the present application, as shown in Figures 2 to 5, the welding assembly 300 may include a support frame 310, a first welding unit 320, and a second welding unit 330. The support frame 310 may be power-driven to a first drive unit 211, and the first welding unit 320 and the second welding unit 330 may be mounted on the support frame 310. Furthermore, the first welding unit 320 and the second welding unit 330 each weld multiple tab sheets 211a from both sides of multiple tab sheets 211a.

[0112] Specifically, the first drive unit 211 can drive the first welding unit 320 and the second welding unit 330 to move by driving the support frame 310.

[0113] By attaching the first welding unit 320 and the second welding unit 330 to the support frame 310, the first drive unit 211 can simultaneously drive the first welding unit 320 and the second welding unit 330 to approach the tab sheet 211a.

[0114] Selectively, when the support base 100 transports the battery core 20a to the press welding work station and corresponds to the tab press structure 200 and welding assembly 300, the multiple tab sheets 211a of the battery core 20a can be positioned 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 simultaneously weld both sides of the multiple tab sheets 211a, thereby making the welding of the multiple tab sheets 211a more robust, improving the welding effect of the multiple tab sheets 211a, and improving the welding efficiency of the multiple tab sheets 211a.

[0115] 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 drive member 322, the first drive member 322 may be attached to a support frame 310 and driven to the first welding head 321, and may be used to drive the first welding head 321 closer to or further away from the support base 100, thereby closer to or further away from the battery core 20a on the support base 100.

[0116] Specifically, during the welding process of the tabs 21a, the first drive member 322 drives the support frame 310 to drive the first welding unit 320, bringing it closer to the multiple tab sheets 211a. At the same time, the first drive member 322 is used to transmit and adjust the position of the first welding head 321, so that the first welding head 321 can accurately align with the multiple tab sheets 211a, thereby welding the multiple tab sheets 211a and improving the welding effect and efficiency of the welding assembly 300.

[0117] Selectively, as shown in Figures 2 to 4, the first drive member 322 may include a first cylinder 3221, which is connected to a first welding head 321 and can drive the first welding head 321 to move relative to the tabs 21a, thereby allowing the first welding head 321 to align with multiple tab sheets 211a and easily weld multiple tab sheets 211a.

[0118] By installing the first drive member 322 to be electrically connected to the first welding head 321, the first welding head 321 can move independently through the transmission of the first drive member 322, making it easier for the first welding unit 320 to adjust its position and align with one side of the multiple tab sheets 211a, thereby achieving accurate welding.

[0119] In some embodiments, the welding assembly 300 may include, but is not limited to, an ultrasonic welding apparatus, a laser welding apparatus, an arc welding apparatus, or a thermite welding apparatus. The welding assembly 300 can weld a plurality of tab sheets 211a by emitting energy such as ultrasonic waves, laser light, or arcs from a first welding head 321 and a second welding head 331, thereby sequentially welding the plurality of tab sheets 211a to form a tab portion 21a.

[0120] In some embodiments of the present application, as shown in Figure 4, the first pressing plate 212 may have a first communication hole 2224 toward the second pressing plate 222, and the first driving member 322 may be arranged to drive the end of the first welding head 321 into or out of the first communication hole 2224.

[0121] In some embodiments, the first pressing plate 212 may further include a blower structure 2121, the air outlet 2122 of the blower structure 2121 being located on the side of the first pressing plate 212 facing the second pressing plate 222, and used to flatten the tab sheet 211a by blowing air.

[0122] Selectively, the first communication hole 2224 in the first pressing plate 212 corresponds to the position of the tab sheet 211a of the battery core 20a, so that the first welding head 321 can be aligned with multiple tab sheets 211a after being inserted into the first communication hole 2224, thereby enabling precise welding to multiple tab sheets 211a.

[0123] Selectively, the blower structure 2121 may include an air outlet 2122 from which air can be blown out. The air outlet 2122 may be located at the end of the first welding head 321 and may be closer to the battery core 20a than the first welding head 321 in a direction perpendicular to a predetermined direction of movement A.

[0124] Furthermore, the installation position of the air outlet 2122 can correspond to the base of the tab sheet 211a, thereby allowing airflow to be blown out from the air outlet 2122 and flattening the tab sheet 211a from its base, thereby further aligning the overall shape of the tab sheet 211a.

[0125] 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 drive member 332, the second drive member 332 of which is power-driven to the second welding head 331 and used to drive the second welding head 331 toward or toward the support base 100.

[0126] Selectively, the second drive member 332 may be attached to the support frame 310, so that when the first drive unit 211 drives the support frame 310, it can simultaneously drive the second welding head 331 and the second drive member 332 to bring them close to the multiple tab sheets 211a, and then the second drive member 332 can transmit power from the second welding head 331 to approach and align with the multiple tab sheets 211a, and weld the multiple tab sheets 211a. Furthermore, after welding is complete, the second drive member 332 can transmit power from the second welding head 331 to move it away from the multiple tab sheets 211a, thereby not affecting subsequent transport to the battery core 20a.

[0127] Selectively, the second drive member 332 may include a second cylinder 3321 connected to a second welding head 331, which can drive the second welding head 331 to move relative to a plurality of tab sheets 211a, thereby allowing the second welding head 331 to align with the plurality of tab sheets 211a and to easily weld the plurality of tab sheets 211a.

[0128] In different embodiments, the second pressing plate 222 may have a different shape for installation.

[0129] For example, in some embodiments, as shown in Figure 5, the intermediate portion of the second pressing plate 222 that approaches the plurality of tab sheets 211a can be higher than the portions on either side and away from the first pressing plate 212 along a predetermined direction of movement A, so that the portion of the second pressing plate 222 that approaches the plurality of tab sheets 211a takes on a "U" shape, so that when the second pressing plate 222 presses the plurality of tab sheets 211a, the intermediate portion can contact and press the tab sheets 211a, and the portions on either side can converge the roots of the plurality of tab sheets 211a, so that the shape of the plurality of tab sheets 211a can be aligned from both sides of the plurality of tab sheets 211a.

[0130] In some other embodiments of the present invention, as shown in Figure 8, the second pressing plate 222 may be positioned such that its end approaching the plurality of tab sheets 211a extends toward the welding assembly 300 and is bent to form a pressing portion, which is used to press and converge the plurality of tab sheets 211a.

[0131] Selectively, the second pressing plate 222 has a second communication hole 2123 toward the first pressing plate 212. The second drive member 332 is positioned to drive the end of the second welding head 331 into or out of the second communication hole 2123.

[0132] Selectively, the second communication hole 2123 in the second pressing plate 222 corresponds to one side of the multiple tab sheets 211a, thereby allowing the second welding head 331 to weld the multiple tab sheets 211a corresponding to the side of the multiple tab sheets 211a after entering the second communication hole 2123.

[0133] With the above setup, after the second pressing plate 222 presses and converges the multiple tab sheets 211a, the second driving member 332 is used to drive the second welding head 331 into the second communication hole 2123, thereby shaping the multiple tab sheets 211a, and then welding the multiple tab sheets 211a using the second welding head 331. Furthermore, during the welding process, the second pressing plate 222 continues to press the multiple tab sheets 211a so that they are less likely to deform, thereby improving the welding effect of the multiple tab sheets 211a.

[0134] In some embodiments of the present application, as shown in Figures 8 and 9, the second pressing plate 222 may include a first fitting surface 2221, a second fitting surface 2222, and a third fitting surface 2223, wherein the second fitting surface 2222 and the first fitting surface 2221 may be set at an obtuse angle, and the third fitting surface 2223 may be set bent relative to the second fitting surface 2222. The first fitting surface 2221 may be used to press the core body 22a of the battery core 20a, the second fitting surface 2222 may be used to cover a portion of the end face of the core body 22a provided with tab sheets 211a, and the third fitting surface 2223 may be used to press a plurality of tab sheets 211a against the first pressing plate 212.

[0135] The first mating surface 2221, the second mating surface 2222, and the third mating surface 2223 selectively conform to the shape of the core body 22a of the battery core 20a and the positions of the multiple tab sheets 211a, thereby making it easier for the second pressing plate 222 to position itself in accordance with the core body 22a of the battery core 20a and to press the multiple tab sheets 211a more efficiently.

[0136] Selectively, the first mating surface 2221 may be perpendicular to a predetermined direction of movement A, and a portion of the second mating surface 2222 may be set at an obtuse angle with the first mating surface 2221, and the angle formed by the second mating surface 2222 and the first mating surface 2221 may be as shown by angle α in Figure 9, where 90° < α < 180°. In other words, the second mating surface 2222 may be set at an inclination in the predetermined direction of movement A.

[0137] When installed in this manner, if the positions of the battery core 20a and the second pressing plate 222 become misaligned as the second pressing plate 222 approaches the battery core 20a, the inclined second fitting surface 2222 can guide and adjust the position of the battery core 20a or the second pressing plate 222 so that the first fitting surface 2221 of the second pressing plate 222 can accurately press the core body 22a of the battery core 20a, and the third fitting surface 2223 can press and converge the multiple tab sheets 21a.

[0138] In some embodiments of the present invention, as shown in Figures 4 and 5, the welding assembly 300 may further include a first dust collection unit 340 and a second dust collection unit 350 used to collect dust from the welding area of ​​a first welding unit 320 and a welding area of ​​a second welding unit 330, respectively.

[0139] The welding area refers to the area that the welding head can influence during use, and is the area that can be covered by thermal energy, ultrasonic waves, and other energies emitted from the welding head. Within this welding area, multiple tab sheets 211a can be welded together as a single unit. Therefore, by performing dust collection treatment on the welding areas of the first welding unit 320 and the second welding unit 330, the occurrence of situations in which other metal impurities or tab debris weld multiple tab sheets 211a within the welding area can be reduced, thereby improving the welding effect of the tab sheets 211a.

[0140] Selectively, the first dust collection unit 340 may also be equipped with a first dust collection port 341 which can be installed in the first communication hole 2224 of the first pressing plate 212, and the first welding head 321 may be installed on the side of the first dust collection port 341 that is closer to the battery core 20a. In this case, the first dust collection port 341 may have a larger projected area in a predetermined direction of movement A than the second welding head 331, so that it has a dust collection passage in addition to the space that houses the first welding head 321, thereby making it easier for the dust collection passage to collect dust from the welding area of ​​the first welding unit 320 when the first welding head 321 is welding the tab 21a.

[0141] Selectively, the second dust collection unit 350 may be equipped with a second dust collection port 351, and the second welding head 331 may be positioned on the side of the second dust collection port 351 that is closer to the battery core 20a. The second dust collection port 351 may have a projected area in a predetermined direction of movement A that is larger than that of the second welding head 331, so that it has a dust collection passage in addition to the space that houses the second welding head 331, thereby making it easier for the dust collection passage to collect dust from the welding area of ​​the second welding unit 330 when the second welding head 331 is welding the tab 21a.

[0142] By installing the first dust collection unit 340 and the second dust collection unit 350 in the welding area of ​​the first welding unit 320 and the welding area of ​​the second welding unit 330, respectively, debris and dust generated in the welding area can be absorbed, making it less likely for debris and dust to be adsorbed onto the multiple tab sheets 211a, and thus less likely to affect the formation of the tab portion 21a.

[0143] In some embodiments of the present application, as shown in Figures 10 to 11, the first drive unit 211 can be arranged to drive the first pressing plate 212 in three dimensions. Optionally, the first drive unit 211 may also drive the support frame 310 in three dimensions.

[0144] Selectively, the first pressing plate 212 may be mounted on the support frame 310, and the first drive unit 211 may drive the first pressing plate 212 to move by driving the support frame 310.

[0145] Selectively, one of the three-dimensional directions may be a predetermined movement direction A, thereby allowing the support frame 310 to move up and down in the predetermined movement direction A to approach the battery core 20a. The other two directions in the three-dimensional direction may be perpendicular to the predetermined movement direction A, and the two perpendicular directions are also perpendicular to each other, thereby allowing the first drive unit 211 to drive the support frame 310 to move left and right or back and forth to approach or move away from the battery core 20a, thereby facilitating alignment of the welding assembly 300 and the first pressing plate 212 with the tabs 21a of the battery core 20a and enabling accurate pressing and welding of the tabs 21a.

[0146] In some embodiments, as shown in Figures 10 to 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 power-driven to the first pressure plate 212 and is used to drive the first pressure plate 212 to move along a first direction. The second drive assembly 203 is power-driven to the first drive assembly 202 and is used to drive the first drive assembly 202 to move along a second direction. The third drive assembly 204 is power-driven to the second drive assembly 203 and is used to drive the second drive assembly 203 to move along a third direction, thereby moving closer to or away from the support base 100. Of these, the first, second, and third directions are perpendicular to each other in pairs.

[0147] As shown in Figures 10 and 11, the third direction, the second direction, and the first direction can correspond to the three directions X, Y, and Z shown in Figures 10 and 11, respectively, and any two of these three directions are perpendicular to each other. The Z direction may be a predetermined direction of movement A.

[0148] Selectively, the first motor 2111, the first reduction gear 2112, the first lead screw 2113, and the first floating joint 2114 in the above embodiment may all be installed within the first drive assembly 202.

[0149] Selectively, the second drive assembly 203 may include a second motor 2115 and a second lead screw 2116, and the third drive assembly 204 may include a third motor 2117 and a third lead screw 2118.

[0150] Of these, the second motor 2115 may be connected to the second lead screw 2116 and may be used to supply electrical energy to the second lead screw 2116. The second lead screw 2116 may be connected to the support frame 310 and may be used to drive the first drive assembly 202 to reciprocate linearly along a second direction Y perpendicular to the first direction Z.

[0151] The third motor 2117 may be connected to the third lead screw 2118 and may be used to supply electrical energy to the third lead screw 2118, the third lead screw 2118 may be connected to the support frame 310 and may be used to drive the second drive assembly 203 to reciprocate linearly along a third direction X perpendicular to the first direction Z and the second direction Y.

[0152] Selectively, as shown in Figures 6 and 11, a first linear slide rail 360, a second linear slide rail 370, and a third linear slide rail 380 may be installed between the support frame 310 and the first drive unit 211, the first linear slide rail 360 may restrict the movement of the support frame 310 in the Z direction, the second linear slide rail 370 may restrict the movement of the support frame 310 in the X direction, and the third linear slide rail 380 may restrict the movement of the support frame 310 in the Y direction.

[0153] In other embodiments, the second drive unit 221 may also be configured to drive the second pressing plate 222 in a three-dimensional direction. Of course, in other embodiments, each drive member unit may also be configured to drive the pressing plate or welding head in other directions.

[0154] In some embodiments of the present application, as shown in Figures 10 and 12, the support base 100 may include a transport rail 110 and a battery core fixture 120, the battery core fixture 120 being attached to the transport rail 110, and the transport rail 110 being used to transport the battery core fixture 120 to and away from the tab pressing structure 200. The battery core fixture 120 may be positioned to support and fix the core body 22a of the battery core 20a.

[0155] Selectively, 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 arranged to drive and move the battery core 20a by driving the battery core fixture 120 in a first direction Z, and the horizontal drive module 140 may be arranged to drive and move the battery core 20a by driving the battery core fixture 120 in a third direction X or a second direction Y.

[0156] By installing the transport rail 110 and the battery core jig 120, the battery core 20a can be easily fixed to the transport rail 110, preventing the battery core 20a from slipping off, and making it easier to transport the battery core 20a to the corresponding welding work station of the tab welding mechanism 10, thereby making it easier to weld the tab sheet 211a.

[0157] In some embodiments of the present invention, as shown in Figure 13, the battery assembly system 20 includes the tab welding mechanism 10 in the above embodiments.

[0158] In some embodiments, as shown in Figure 1, the battery 1 may include a casing 10a, a bottom cover 30a, and a battery core 20a. The casing 10a may have an open end 12a, and pole columns 15a may be installed on the wall opposite the open end 12a of the casing 10a. The pole columns 15a may have a communication hole 14a, and the casing 10a and the bottom cover 30a are connected to form a housing cavity 11a that communicates with the communication hole 14a. The active material coated portion of the battery core 20a is installed inside the casing 10a, and the tab portion 21a of the battery core 20a is connected to the side of the pole column 15a that is separated from the housing cavity 11a by passing through the communication hole 14a.

[0159] As shown in Figure 13, the battery assembly system 20 further includes a transport facility 21 and an assembly facility 22, the transport facility 21 being used to transport the structures to be assembled to each work station of the assembly facility 22. The work stations of the assembly facility 22 include at least a tab welding mechanism 10, the tab welding mechanism 10 being used to weld a plurality of tab sheets 211a of the core body to form tab portions 21a.

[0160] It should be explained that in this embodiment, the conveying equipment 21 may include a conveying line 23, and the conveying line 23 may be a conveying structure formed by motor-driven conveying rollers fitted with a conveying belt, a conveying structure formed by motor-driven conveying links hinged together, or an AGV conveying trolley, and it is sufficient that it can realize conveying in at least one direction and support the structure to be assembled in a way that ensures stability.

[0161] The tab welding mechanism 10 aims to form the tab portion 21a after pre-welding multiple tab sheets 211a, and is optionally an ultrasonic welding device, as long as it can guarantee that the multiple tab sheets 211a are welded in a tightened and stable state.

[0162] In some embodiments, the transport equipment 21 can be linked with the transport rail 110 of the tab welding mechanism 10 to transport the battery core 20a. For example, the transport equipment 21 is an AGV transport cart, and the transport equipment 21 can transport the battery core 20a from other work stations to the transport rail 110 of the tab welding mechanism 10, thereby allowing the transport rail 110 to further transport the battery core 20a to a position corresponding to the tab pressing structure 200 and the welding assembly 300, making it easier for the tab welding mechanism 10 to press, converge, and weld the tab sheet 211a inside the battery core 20a to form the tab portion 21a.

[0163] Alternatively, the conveying equipment 21 may be a conveying line 23 connected to the conveying rail 110, which can convey the battery core 20a to the conveying rail 110, and then the conveying rail 110 can further convey the battery core 20a to a position corresponding to the tab pressing structure 200 and the welding assembly 300.

[0164] Of course, in other embodiments, if the conveying equipment 21 is a conveying line 23, the tab welding mechanism 10 does not need to have a conveying rail 110 installed, the conveying line 23 may be installed directly in correspondence with the tab welding mechanism 10, and the conveying line 23 can convey the battery core 20a to a position corresponding to the tab pressing structure 200 and the welding assembly 300 so that the tab welding mechanism 10 can easily press, converge and weld the tab sheet 211a in the battery core 20a to form the tab portion 21a.

[0165] In some embodiments, as shown in Figure 13, the assembly equipment 22 work station may further include a casing insertion device 24, a tab penetration device 25, a pole column welding device 26, and a bottom cover welding device 27. Of these, the transport equipment 21 may be used to sequentially transport the battery core 20a with the tab portion 21a formed thereon to the casing insertion device 24, the tab penetration device 25, the pole column welding device 26, and the bottom cover welding device 27.

[0166] Of these, the casing insertion device 24 may be used to insert the core body 22a into the casing 10a from the open end 12a. The tab penetration device 25 may be used to grip the tab portion 21a and penetrate the communication hole 14a when inserting the core body 22a into the casing 10a. The pole column welding device 26 may be used to weld the tab portion 21a that has penetrated the communication hole 14a to the side of the pole column 15a that is away from the housing cavity 11a. The bottom cover welding device 27 may be used to weld the bottom cover 30a to the open end 12a of the casing 10a.

[0167] Of these, the casing insertion device 24 may be a pushing mechanism or a clamping mechanism, and should stably move the core body 22a toward the open end 12a of the casing 10a and insert it into the housing cavity 11a through the open end 12a. Similarly, the tab penetration device 25 can employ a clamping structure or a guide structure, and should be able to guide the tab portion 21a to smoothly penetrate the communication hole 14a without interfering with the casing 10a. The pole column welding device 26 aims to achieve welding of the tab portion 21a and the pole column 15a and is optionally a laser welding device. The bottom cover welding device 27 aims to achieve circumferential edge welding of the bottom cover 30a and the open end 12a of the casing 10a and is also a laser welding device.

[0168] By installing a casing insertion device 24, a tab penetration device 25, a pole column welding device 26, and a bottom cover welding device 27 within the battery assembly system 20, the assembly flow of the battery 1 by the battery assembly system 20 can be made smoother, the assembly flow of the battery 1 can be simplified, and the standardization and intelligence of the assembly flow of the battery 1 can be improved.

[0169] Furthermore, the assembly equipment 22 is not limited to including a tab welding mechanism 10, a casing insertion device 24, a tab penetration device 25, a pole column welding device 26, and a bottom cover welding device 27. Exemplarily, if there are multiple core bodies 22a, for example two, the assembly equipment 22 further includes a pairing device 28, which is used to stack and set up multiple core bodies 22a such that the tab sheets 211a of two core bodies 22a are substantially opposite each other, in order to facilitate the transport structure to transport the paired core bodies 22a to the tab welding mechanism 10a for welding of the tab sheets 211a in order to facilitate the formation of the tab portions 21a. Further exemplarily, to ensure the reliability of the assembly process of the battery 1, dust removal, NG inspection work stations, etc., may be added between any two adjacent work stations, and this embodiment is not limited thereto.

[0170] According to some embodiments of the present 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. Of these, the support base 100 is installed on the base 11 and used to support and fix the core body 22a of the battery core 20a, the tab pressing structure 200 is installed on the base 11 and is movably positioned toward the support base 100 to press and converge a plurality of tab sheets 211a stacked on the battery core 20a, the welding assembly 300 is installed on the base 11 and is movably positioned toward the support base 100 to weld the converged plurality of tab sheets 211a to form a tab portion 21a. The tab pressing structure 200 includes a first assembly 210 and a second assembly 220, which are movably installed on the base 11, respectively. The first assembly 210 and the second assembly 220 may be positioned closer to or further apart from each other. The first assembly 210 and the second assembly 220 can form a clamping cavity 201 when brought relatively close together, and the first assembly 210 and the second assembly 220 are used to clamp a plurality of tab sheets 211a within the clamping cavity 201 so as to press and converge the plurality of tab sheets 211a. The first assembly 210 includes a first drive unit 211 and a first press plate 212, the first drive unit 211 may be mounted on the base 11, or drive-connected to the first press plate 212, and may be positioned to drive the first press plate 212 toward or toward the support base 100. The second assembly 220 includes a second drive unit 221 and a second press plate 222, the second drive unit 221 is mounted on the base 11 and is positioned to drive the second press plate 222 toward or toward the support base 100. Of these, the first drive unit 211 and the second drive unit 221 are located on either side of the support base 100, respectively, and can move the first assembly 210 and the second assembly 220 closer together or further apart, thereby forming a dimensionally adjustable clamping cavity 201. The welding assembly 300 includes a support frame 310, a first welding unit 320, and a second welding unit 330.The support frame 310 may be power-driven to the first drive unit 211, and the first welding unit 320 and the second welding unit 330 may be mounted on the support frame 310. Furthermore, the first welding unit 320 and the second welding unit 330 each weld a plurality of tab sheets 211a from both sides of the plurality of tab sheets 211a. The first welding unit 320 includes a first welding head 321 and a first drive member 322, the first drive member 322 being mounted on the support frame 310, the first welding head 321 being mounted on the first drive member 322, and the first drive member 322 being power-driven to the first welding head 321 and used to drive the first welding head 321 closer to or further away from the support base 100. The first pressing plate 212 may have a first communication hole 2224 toward the second pressing plate 222, and the first drive member 322 may be arranged to drive the end of the first welding head 321 into or out of the first communication hole 2224. and / or, the first pressing plate 212 may further include a blower structure 2121, the air outlet 2122 of the blower structure 2121 located on the side of the first pressing plate 212 toward the second pressing plate 222, and used to flatten the tab sheet 211a by blowing air. The second welding unit 330 includes a second welding head 331 and a second drive member 332, the second drive member 332 being power-driven to the second welding head 331 and used to drive the second welding head 331 toward or toward the support base 100. The second pressing plate 222 has a second communication hole 2123 toward the first pressing plate 212. The second drive member 332 is positioned to drive the end of the second welding head 331 toward or toward the second communication hole 2123. The welding assembly 300 further includes a first dust collection unit 340 and a second dust collection unit 350 used to collect dust from the welding area of ​​the first welding unit 320 and the welding area of ​​the second welding unit 330, respectively. The first drive unit 211 is positioned to drive the first pressing plate 212 in a three-dimensional direction. 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 powered by the first press plate 212 and is used to drive the first press plate 212 to move along the first direction Z. The second drive assembly 203 is powered by the first drive assembly 202 and is used to drive the first drive assembly 202 to move along the second direction Y. The third drive assembly 204 is powered by the second drive assembly 203 and is used to drive the second drive assembly 203 to move along the third direction X, thereby moving it closer to or further away from the support base 100. Of these, the first direction Z, the second direction Y, and the third direction X are perpendicular to each other in pairs. The second pressing plate 222 includes a first mating surface 2221, a second mating surface 2222, and a third mating surface 2223, wherein the second mating surface 2222 and the first mating surface 2221 are set at an obtuse angle, and the third mating surface 2223 is set bent relative to the second mating surface 2222. The first mating surface 2221 is used to press the core body 22a of the battery core 20a, the second mating surface 2222 is used to cover a portion of the end face of the core body 22a where the tab sheet 211a is provided, and the third mating surface 2223 may be used to press a plurality of tab sheets 211a against the first pressing plate 212. The support base 100 includes a transport rail 110 and a battery core fixture 120. The battery core fixture 120 is attached to the transport rail 110, which is used to transport the battery core fixture 120 to the tab pressing structure 200 and to transport the battery core fixture 120 away from the tab pressing structure 200. The battery core fixture 120 is positioned to support and fix the core body 22a of the battery core 20a.

[0171] 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 embodiments. The battery 1 may include a casing 10a, a bottom cover 30a, and a battery core 20a. The casing 10a may have an open end 12a, and pole columns 15a may be installed on the wall opposite the open end 12a of the casing 10a, and the pole columns 15a may have a communication hole 14a, and the casing 10a and the bottom cover 30a are connected to form a housing cavity 11a that communicates with the communication hole 14a. The active material coated portion of the battery core 20a is installed inside the casing 10a, and the tab portion 21a of the battery core 20a is connected to the side of the pole column 15a that is separated from the housing cavity 11a by passing through the communication hole 14a. The battery assembly system 20 further includes a transport device 21 and an assembly device 22, the transport device 21 being used to transport the structure to be assembled to each work station of the assembly device 22. The work stations of the assembly device 22 include at least a tab welding mechanism 10, the work stations of the assembly device 22 being used to weld a plurality of tab sheets 211a of the core body to form the tab portion 21a. The battery assembly system 20 further includes a casing insertion device 24, a tab penetration device 25, a pole column welding device 26 and a bottom cover welding device 27. The transport device 21 may be used to sequentially transport the battery core 20a with the tab portion 21a formed to the casing insertion device 24, the tab penetration device 25, the pole column welding device 26 and the bottom cover welding device 27. The casing insertion device 24 is used to insert the core body 22a into the casing 10a from the open end 12a. The tab penetration device 25 is used to hold the tab portion 21a and penetrate the communication hole 14a when inserting the core body 22a into the casing 10a. The pole column welding device 26 is used to weld the tab portion 21a that has penetrated the communication hole 14a to the side of the pole column 15a that is away from the housing cavity 11a. The bottom cover welding device 27 is used to weld the bottom cover 30a to the open end 12a of the casing 10a.

[0172] In summary, the present invention provides a tab welding mechanism 10 that not only has a welding assembly 300 installed on it, but also a support base 100 and a tab pressing structure 200. With this design, the tab welding mechanism 10 can not only weld the tab sheets 211a of the battery core 20a, but also press and converge the tab sheets 211a before welding to compress them, thereby shortening the spacing between the tab sheets 211a and compressing them, making it easier to weld the tabs 21a, thereby reducing the difficulty of welding and improving the yield rate of the battery core 20a. The support base 100 can transport the battery core 20a to a position corresponding to the tab pressing structure 200 or welding assembly 300 to facilitate pressing and welding the tab sheets 211a of the battery core 20a, and also facilitates transporting the battery core 20a to other positions after the tab sheets 211a have been pressed and welded to form the tab portion.

[0173] The above description is merely an example of the present application and does not limit the scope of the claims of this application. Any transformation of equivalent structures or equivalent flows, or any other application directly or indirectly to the relevant technical field, made using the contents of the specification and drawings of this application, falls within the scope of the claims of this application.

Claims

1. A tab welding mechanism comprising a base and A support base installed on the aforementioned base for supporting and fixing the core body of the battery core, A tab pressing structure is installed on the base and is movably positioned toward the support base to press and converge a plurality of tab sheets stacked on the battery core, The invention is characterized by including a welding assembly that is installed on the base and is movably positioned toward the support base so as to weld the converged plurality of tab sheets together to form a tab portion, Tab welding mechanism.

2. The tab pressing structure includes a first assembly and a second assembly, each movably mounted on the base, wherein the first and second assemblies are positioned to be relatively close or far apart, and when relatively close, the first and second assemblies can form a clamping cavity, and the first and second assemblies are used to clamp the plurality of tab sheets within the clamping cavity so as to press and converge the plurality of tab sheets. The tab welding mechanism according to claim 1.

3. The first assembly includes a first drive unit and a first pressing plate, wherein the first drive unit is mounted on the base and power-driven to the first pressing plate, and is arranged to drive the first pressing plate to move closer to or away from the support base. The tab welding mechanism according to claim 2.

4. The second assembly includes a second drive unit and a second pressing plate, the second drive unit being mounted on the base and power-driven to the second pressing plate, and positioned to drive the second pressing plate toward or away from the support base. The first drive unit and the second drive unit are located on either side of the support base, respectively, and the first assembly and the second assembly can be moved closer together or further apart, thereby forming the dimensionally adjustable clamping cavity. The tab welding mechanism according to claim 3.

5. The welding assembly includes a support frame, a first welding unit, and a second welding unit, wherein the support frame is power-driven to the first drive unit, the first welding unit and the second welding unit are mounted on the support frame, and the first welding unit and the second welding unit each weld the plurality of tab sheets from both sides of the plurality of tab sheets. The tab welding mechanism according to claim 4.

6. The first welding unit includes a first welding head and a first drive member, the first drive member being attached to the support frame and electrically connected to the first welding head, and used to drive the first welding head toward or toward the support base, The tab welding mechanism according to claim 5.

7. The first pressing plate has a first communication hole toward the second pressing plate, the first driving member is arranged to drive the end of the first welding head into or out of the first communication hole, and / or the first pressing plate further includes a blower structure, the air outlet of the blower structure is installed on the side of the first pressing plate toward the second pressing plate and is used to flatten the tab sheet by blowing air. The tab welding mechanism according to claim 6.

8. The second welding unit includes a second welding head and a second drive member, the second drive member being attached to the support frame and electrically connected to the second welding head, and used to drive the second welding head toward or toward the support base, The tab welding mechanism according to claim 5.

9. The second pressing plate has a second communication hole toward the first pressing plate, and the second driving member is arranged to drive the end of the second welding head into the second communication hole or to exit the second communication hole. The tab welding mechanism according to claim 8.

10. The welding assembly further comprises a first dust collection unit and a second dust collection unit used to collect dust from the welding area of ​​the first welding unit and the welding area of ​​the second welding unit, respectively. The tab welding mechanism according to claim 5.

11. The first drive unit is characterized by being arranged to drive the first pressing plate in a three-dimensional direction. The tab welding mechanism according to claim 3.

12. The first drive unit includes a first drive assembly, a second drive assembly, and a third drive assembly, wherein the first drive assembly is powered to the first pressing plate and used to drive the first pressing plate to move along a first direction; the second drive assembly is powered to the first drive assembly and used to drive the first drive assembly to move along a second direction; and the third drive assembly is powered to the second drive assembly and used to drive the second drive assembly to move along a third direction to move towards or away from the support base. Of these, the first direction, the second direction, and the third direction are characterized in that two of each direction are perpendicular to each other. The tab welding mechanism according to claim 11.

13. The second pressing plate includes a first fitting surface, a second fitting surface, and a third fitting surface, wherein the second fitting surface and the first fitting surface are set at an obtuse angle, and the third fitting surface is set bent relative to the second fitting surface. The first fitting surface is used to press onto the core body of the battery core, the second fitting surface is used to cover a portion of the end face of the battery core on which the tab sheet is provided, and the third fitting surface is used to press the plurality of tab sheets onto the first pressing plate. The tab welding mechanism according to claim 4.

14. The support base includes a transport rail and a battery core jig, the transport rail is installed on the base, the battery core jig is attached to the transport rail, and the transport rail is used to transport the battery core jig to the tab pressing structure and to transport the battery core jig away from the tab pressing structure. The battery core jig is characterized by being arranged to support and fix the core body of the battery core. A tab welding mechanism according to any one of claims 1 to 13.

15. A tab welding mechanism as described in any one of claims 1 to 14, Battery assembly system.

16. The battery comprises a casing, a bottom cover, and a battery core, the casing having an open end, poles installed on the wall of the casing facing the open end, the poles having communication holes, the casing and the bottom cover being connected to form a housing cavity communicating with the communication holes, the active material coated portion of the battery core being installed inside the casing, and the tab portion of the battery core being connected to the side of the poles moving away from the housing cavity through the communication holes. The battery assembly system further includes transport equipment and assembly equipment, the transport equipment being used to transport the structures to be assembled to each work station of the assembly equipment, and the work stations of the assembly equipment including at least the tab welding mechanism. Among these, the tab welding mechanism is characterized by being used to weld the plurality of tab sheets of the battery core to form tab portions. The battery assembly system according to claim 15.

17. The assembly equipment's work station further includes a casing insertion device, a tab penetration device, a pole column welding device, and a bottom cover welding device. The conveying equipment is used to sequentially convey the battery core, on which the tab portion is formed, to the casing insertion device, the tab penetration device, the pole column welding device, and the bottom cover welding device. The casing insertion device is used to insert the battery core into the casing from the open end. The tab penetration device is used to grip the tab portion and penetrate the communication hole when inserting the battery core into the casing. The pole column welding mechanism is used to weld the tab portion that penetrates the communication hole to the side of the pole column that is separated from the housing cavity. The bottom cover welding device is used to weld the bottom cover to the open end of the casing. The battery assembly system according to claim 16.

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