Tab cutting mechanism and battery assembling system

Abstract

The invention discloses a tab cutting mechanism and a battery assembling system. The tab cutting mechanism comprises a supporting structure, a cutter assembly, an electrode assembly positioning assembly and a first driving assembly, the cutter assembly comprises a first component and a second component, and the first component is installed on the supporting structure. The electrode assembly positioning assembly is mounted on the supporting structure and is arranged to be used for supporting and positioning a main body part of an electrode assembly, and the first component is used for supporting a tab part of the electrode assembly; the first driving assembly is mounted on the supporting structure, is connected with the second component and is arranged to be used for driving the second component to move, so that the second component is matched with the first component to cut the tab part. Through the mode, the problems of low alignment degree, dislocation and inconsistent boundary dimensions of the tab parts can be solved, so that the tab parts are more regular, a shell can be conveniently added to the electrode assembly subsequently, and the yield of a battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to an ear cutting mechanism and a battery assembly system. Background Art

[0002] A battery refers to a part of a cup, trough or other container or composite container that contains an electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy. With the development of technology, batteries with the advantages of being easy to carry, simple to charge and discharge, and stably powering for a long time are widely used in fields such as automobiles, household appliances, and aerospace.

[0003] However, in the production process of existing batteries, after the electrode assembly in the battery is wound and the ears are welded, problems such as misalignment and inconsistent outer dimensions may occur in the ear parts, which will affect the subsequent processes of the electrode assembly and result in a low yield rate of the batteries. Summary of the Invention

[0004] In view of the above problems, the present application provides an ear cutting mechanism and a battery assembly system, which can solve the problems of low alignment, misalignment, and inconsistent outer dimensions of the ear parts, making the ear parts more regular, so as to facilitate adding a housing around the electrode assembly later and improve the yield rate of the batteries.

[0005] In a first aspect, the present application provides an ear cutting mechanism, which includes a support structure, a cutter assembly, an electrode assembly positioning component, and a first driving component. The cutter assembly includes a first member and a second member, and the first member is installed on the support structure. The electrode assembly positioning component is configured to support and position the main body of the electrode assembly, and the first member is used to support the ear part of the electrode assembly. The first driving component is installed on the support structure and is connected to the second member, and is configured to drive the second member to move so that the second member cooperates with the first member to cut the ear part.

[0006] In the technical solution of the embodiment of the present application, the ear cutting mechanism is used to cut the ear part of the electrode assembly, and the first driving component is provided in the ear cutting mechanism to make the second member cooperate with the first member to cut the ear part. Such a design makes it convenient to cut the ear part, makes the ear part more regular, can solve the problems of low alignment, misalignment, and inconsistent outer dimensions of the ear part, so as to facilitate adding a housing around the electrode assembly later, thereby improving the yield rate of the batteries.

[0007] In some embodiments, the first member includes a first support surface and a first side surface, and a first cutting edge is formed at the connection of the first support surface and the first side surface, and the first support surface is used to support the ear part of the electrode assembly.

[0008] Through the above-mentioned arrangement, the first supporting surface can support the pole ear portion of the electrode assembly, so that the pole ear portion can be more stable during cutting, and when the first driving assembly is used to drive the second component close to the first component, it can cooperate with the first blade of the first component to facilitate cutting of the pole ear portion, thereby regularizing the shape of the pole ear portion.

[0009] In some embodiments, the second component includes a second pushing surface and a second side surface, wherein the second pushing surface and the second side surface are connected to form a second blade, and the second pushing surface is used to contact and push the cut-off waste material of the pole ear portion.

[0010] Through the above arrangement, when the second pushing surface is close to the waste material of the pole ear, the second blade can cut the pole ear, thereby facilitating the cutting of the pole ear.

[0011] In some embodiments, the second side includes a recessed portion recessed away from the electrode assembly positioning assembly.

[0012] By providing a concave portion on the second side surface, the second blade formed by the second side surface and the second pushing surface can be adapted to the shape of the pole ear portion, and after the second blade cuts the pole ear portion, a pole ear portion of a corresponding shape can be obtained.

[0013] In some embodiments, the first side includes a protruding portion protruding away from the electrode assembly positioning component. The first side also includes two planar portions, the two planar portions are respectively located on both sides of the protruding portion, and the two planar portions are closer to the electrode assembly positioning component than the protruding portion.

[0014] By positioning the two planar portions closer to the electrode assembly than the protruding portion, and the protruding portion and the connecting portions of the two planar portions and the first supporting surface can form a first cutting edge, it is possible to cut the root of the pole ear when cutting the pole ear, and more effectively regulate the shape of the pole ear to facilitate the subsequent addition of a shell around the electrode assembly.

[0015] In some embodiments, the first component also includes a first component body, the first component body includes a first main body support surface and a first transition surface extending from the first main body support surface toward the first support surface, and the portion of the first transition surface connected to the first support surface gradually moves away from the electrode assembly positioning component as it gradually moves away from the first main body support surface.

[0016] By arranging the first transition surface to gradually move away from the electrode assembly positioning assembly as it gradually moves away from the first main body support surface, the first transition surface can be used to gather the root of the pole ear when the electrode assembly is placed on the first main body support surface, so that the pole ear can be correctly placed on the first component before cutting, thereby facilitating the cutting of the pole ear.

[0017] In some embodiments, the cutting blade assembly further includes an elastic pressing member, which is installed on the side of the second member facing the first member and is used to press the tab portion of the electrode assembly against the first member.

[0018] By providing the elastic pressing member for pressing the tab portion when cutting the tab portion of the second member, the tab portion is not likely to move or deform when the second member cuts the tab portion, so that the tab portion is more regular.

[0019] In some embodiments, the support structure includes a first support frame, a second support frame, and a second driving assembly. The second driving assembly is connected between the first support frame and the second support frame and is used to drive the second support frame to move back and forth relative to the first support frame. The first member and the first driving assembly are both installed on the second support frame. The second member is installed on the first support frame.

[0020] By respectively arranging the first member and the first driving assembly on the second support frame, and providing the second driving assembly and the first driving assembly to drive the second support frame to move back and forth relative to the first support frame, the second driving assembly can drive the second support frame and the first member to approach the tab portion to align and support the tab portion, so as to facilitate cutting the tab portion.

[0021] In some embodiments, the cutting blade assembly further includes a blowing structure, which is arranged on the side of the second member facing the first member and is used to blow off the waste material of the cut tab portion.

[0022] By providing the blowing structure to blow off the waste material of the tab portion to be cut, it is possible to prevent the waste material from adhering to the tab portion, the first member or the second member after cutting the tab portion, so as to reduce the situation that the waste material of the tab portion affects the subsequent cutting of the tab portion and other subsequent processes.

[0023] In some embodiments, the tab cutting mechanism further includes a waste collection structure, which is installed on the support structure and includes a collection cavity with an opening. The opening is located on the side of the first member away from the second member. The blowing structure is used to blow the waste material of the tab portion towards the opening.

[0024] By providing the waste collection structure, the waste material of the tab portion blown off by the blowing structure can be collected, so as to reduce the situation that the waste material of the tab portion scatters into components such as the support structure and the cutting blade assembly and affects the operation of each component, thereby making the process of cutting the tab portion more standardized.

[0025] In some embodiments, the first driving assembly includes a cylinder. And / or the number of the first components is two, and the two first components are used to support the two pole ears of the electrode assembly respectively. The second component includes two second blades, and the two second blades are used to cooperate with the two first components to cut the two pole ears of the electrode assembly respectively. And / or, the electrode assembly positioning assembly is further configured to transport the electrode assembly toward the direction of the cutter assembly.

[0026] By arranging two second blades to cooperate with two first components to cut the two pole ears of the electrode assembly, the two pole ears of the electrode assembly can be cut at the same time, thus shortening the cutting time of the pole ears. And the electrode assembly positioning assembly is arranged to drive the electrode assembly to move, which can facilitate the transportation of the electrode assembly.

[0027] In a second aspect, the present application provides a battery assembly system, which includes the tab cutting mechanism in the above-mentioned embodiment.

[0028] In some embodiments, the battery includes a shell, a bottom cover, and an electrode assembly. The shell has an open end, and a pole is arranged on the wall of the shell opposite to the open end, and the pole has a through hole, and the shell and the bottom cover are connected to form a receiving cavity connected to the through hole. The active material coating part of the electrode assembly is arranged in the shell, and the pole ear part of the electrode assembly passes through the through hole and is connected to the side of the pole away from the receiving cavity.

[0029] The battery assembly system includes a conveying device and an assembly device. The conveying device is used to convey the structure to be assembled to each station of the assembly device. The stations of the assembly device also include a tab welding device, a shell insertion device, a tab insertion device, a pole welding device and a bottom cover welding device.

[0030] Among them, the pole ear welding device is used to weld multiple pole ear sheets of the electrode assembly to form a pole ear portion; the pole ear cutting mechanism is used to cut the pole ear portion after welding to form the pole ear portion. The shell insertion device is used to load the electrode assembly into the shell from the open end. The pole ear piercing device is used to clamp the pole ear portion through the through hole when the electrode assembly is loaded into the shell. The pole column welding device is used to weld the pole ear portion passing through the through hole to the side of the pole away from the accommodating cavity. The bottom cover welding device is used to weld the bottom cover to the open end of the shell.

[0031] By providing a conveying device in the battery assembly system, the battery structure to be assembled can be gradually conveyed to each workstation corresponding to each assembly device, so as to simplify the battery assembly process and facilitate the overall assembly of the battery.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0034] Figure 1 is a schematic structural diagram of an electrode assembly according to some embodiments of the present application;

[0035] Figure 2 is a partial structural diagram of an ear cutting mechanism according to some embodiments of the present application;

[0036] Figure 3 is Figure 2 an enlarged proportional structural diagram of the O region of the ear cutting mechanism embodiment shown;

[0037] Figure 4 is Figure 2 a partial structural diagram of the ear cutting mechanism embodiment shown;

[0038] Figure 5 is Figure 4 a structural diagram of the second component in the ear cutting mechanism embodiment shown;

[0039] Figure 6 is Figure 4 an enlarged proportional structural diagram of the P region of the ear cutting mechanism embodiment shown;

[0040] Figure 7 is Figure 2 a partial structural diagram of another perspective of the ear cutting mechanism embodiment shown;

[0041] Figure 8 is Figure 7 an enlarged proportional structural diagram of the Q region of the ear cutting mechanism embodiment shown;

[0042] Figure 9 is a schematic overall structural diagram of an ear cutting mechanism according to some embodiments of the present application;

[0043] Figure 10 is another schematic overall structural diagram of an ear cutting mechanism according to some embodiments of the present application;

[0044] Figure 11 is Figure 10 an enlarged proportional structural diagram of the R region of the ear cutting mechanism embodiment shown;

[0045] Figure 12It is a schematic diagram of the overall structure of a battery assembly system according to some embodiments of the present application.

[0046] The reference numerals in the specific embodiments are as follows:

[0047] Battery 1, housing 10a, electrode assembly 20, accommodation cavity 11, through hole 14, tab portion 21, main body portion 22, pole column 15, top 13, open end 12, bottom cover 30;

[0048] Tab cutting mechanism 10, support structure 100, cutter assembly 200, electrode assembly positioning component 300, first driving component 400, first member 210, second member 220, first support surface 211, first side surface 212, first cutting edge 213, second pushing surface 221, second side surface 222, second cutting edge 223, protruding portion 2121, two planar portions 2122, recessed portion 2221, first planar portion 2222, first member main body 214, first main body portion support surface 2141, first transition surface 2142, first support frame 110, second support frame 120, second driving component 130, motor 131, speed reducer 132, lead screw 133, floating joint 134, linear slide rail 101, elastic pressing member 230, pressing portion 231, elastic portion 232, blowing structure 240, air outlet 241, waste collection structure 500, collection cavity 510, cylinder 410, conveyor belt 310, fixture 320, third driving component 330. Specific embodiments

[0049] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0050] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0053] Reference to "embodiment" in this document means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0055] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0058] With the development of battery technology, batteries are used in more and more fields and are gradually replacing traditional fossil energy in the field of automobile power. Batteries can store chemical energy and controllably convert chemical energy into electrical energy. In recyclable batteries, the active materials can be activated by charging after discharge and continue to be used.

[0059] Usually, in the process of manufacturing batteries, it is necessary to first set the pole ear part of the electrode assembly, and then add a layer of shell on the periphery of the electrode assembly. However, after the electrode assembly in the battery is wound, the alignment of the pole ear parts of each layer is not high, and there may be problems such as misalignment and inconsistent external dimensions, which will affect the subsequent process of the electrode assembly. For example, when the shell is added to the electrode assembly later, the pole ear parts that are misaligned or inconsistent in appearance are not easy to pass through the slit of the shell and are thus folded and cannot extend out of the shell, resulting in a low battery yield.

[0060] In order to solve the problem of low alignment of the pole ears of each layer after the electrode assembly is wound, the pole ears of the electrode assembly can be cut before adding the shell to regularize the shape of the pole ears, thereby facilitating the subsequent addition of the shell to the electrode assembly or other processes.

[0061] Based on the above considerations, the present application provides a tab cutting mechanism and a battery assembly system, wherein the tab cutting mechanism includes a support structure, a cutter assembly, an electrode assembly positioning assembly, and a first drive assembly. The cutter assembly includes a first component and a second component, and the first component is mounted on the support structure. The electrode assembly positioning assembly is configured to support and position the main body of the electrode assembly, and the first component is used to support the tab portion of the electrode assembly. The first drive assembly is mounted on the support structure and connected to the second component, and is configured to drive the second component to move so that the second component cooperates with the first component to cut the tab portion.

[0062] The structure of the battery is exemplarily described below.

[0063] like Figure 1 As shown, the battery 1 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0064] In some embodiments, Figure 1 As shown, the battery 1 may include a shell 10a, a bottom cover 30 and an electrode assembly 20. The shell 10a may have an open end 12, and a pole 15 may be provided on the wall of the shell 10a opposite to the open end 12. The pole 15 may have a through hole 14, and the shell 10a may be connected to the bottom cover 30 to form a receiving cavity 11 connected to the through hole 14. The active material coating portion of the electrode assembly 20 is disposed in the shell 10a, and the pole ear portion 21 of the electrode assembly 20 passes through the through hole 14 and is connected to the side of the pole 15 away from the receiving cavity 11.

[0065] Optionally, the bottom cover 30 can be attached to the open end 12 of the housing 10a to isolate the internal environment of the battery 1 from the external environment. Without limitation, the shape of the bottom cover 30 can be adapted to the shape of the open end 12 to fit the housing 10a. Optionally, the bottom cover 30 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the bottom cover 30 is not easily deformed when subjected to extrusion and collision, enabling the battery 1 to have higher structural strength and improved safety performance.

[0066] Components such as the terminal post 15 can be provided on the housing 10a. The terminal post 15 can be used for electrically connecting to the electrode assembly 20 to output or input the electrical energy of the battery 1. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery 1 reaches a threshold can also be provided on the housing 10a.

[0067] The housing 10a is a component for cooperating with the bottom cover 30 to form the internal environment of the battery 1. Among them, the formed internal environment can be used to accommodate the electrode assembly 20, the electrolyte, and other components. The housing 10a and the bottom cover 30 can be independent components. An open end 12 can be provided on the housing 10a, and the bottom cover 30 is attached to the open end 12 at the open end 12 to form the internal environment of the battery 1. In other embodiments, the shape of the housing 10a can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 10a can be various, for example, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0068] The electrode assembly 20 is a component in the battery 1 where an electrochemical reaction occurs. The housing 10a can contain one or more electrode assemblies 20.

[0069] In some embodiments, the electrode assembly 20 is provided with a tab 21 and a main body 22. The tab 21 can conduct current out of the main body 22. The tab 21 includes a positive tab and a negative tab 21. The positive tab and the negative tab can be located at one end of the main body 22 together or at both ends of the main body 22 respectively. During the charge and discharge process of the battery 1, the positive active material and the negative active material react with the electrolyte, and the tab 21 is connected to the terminal post 15 to form a current loop.

[0070] In some embodiments, the main body 22 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the electrode assembly 20, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is provided between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting and at the same time allow the active ions to pass through.

[0071] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0072] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on either or both of the two opposite surfaces of the positive electrode current collector.

[0073] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material substrate 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, etc.) on a polymer material substrate (such as substrates of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery 1 may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 , LiMn2O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (which may also be abbreviated as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O 2 (which may also be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (which can also be abbreviated as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (which can also be abbreviated as NCM 811 )、lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds, etc.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can be a metal foil, a foam metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0078] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0079] As an example, the negative electrode active material may be a negative electrode active material for the electrode assembly 20 well-known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials may be selected from at least one of elemental silicon, silicon oxides, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials may be selected from at least one of elemental tin, tin oxides, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery 1 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0080] 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.

[0081] In some embodiments, the main body 22 further includes a separator disposed between the positive electrode and the negative electrode.

[0082] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any well-known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the electrode assembly 20 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte may be liquid, gel-like, or solid.

[0086] Among them, the liquid electrolyte includes electrolyte salts and solvents.

[0087] In some embodiments, the electrolyte salts may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium bis(oxalate) borate, lithium difluoro bis(oxalate) phosphate, and lithium tetrafluorooxalate phosphate.

[0088] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0089] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0090] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0091] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0092] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and one or more of a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0093] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0094] In some embodiments, the main body 22 has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0095] Based on the structure of the above battery 1, the battery assembly system for assembling the battery 1 is described below by way of example.

[0096] The battery assembly system may include a conveying device and an assembling device. The conveying device may be used to convey the structure to be assembled to each station of the assembling device. The assembling device of the battery assembly system may include an ear cutting mechanism. Optionally, the stations of the assembling device may further include an ear welding device, a casing inserting device, an ear threading device, a terminal welding device, and a bottom cover welding device.

[0097] Among them, the tab welding device can be used to weld a plurality of tab pieces of the electrode assembly 20 to form a tab portion. The tab cutting mechanism is used to cut the tab portion 21 after the tab portion 21 is welded. The shell loading device is used to load the electrode assembly 20 into the set housing 10a from the open end 12. The tab passing device is used to hold the tab portion 21 and pass it through the through hole 14 when the electrode assembly 20 is loaded into the housing 10a. The terminal welding device is used to weld the tab portion 21 passing through the through hole 14 to the side of the terminal 15 facing away from the accommodation cavity 11. The bottom cover 30 welding device is used to weld the bottom cover 30 to the open end 12 of the housing 10a.

[0098] It should be noted that, in this embodiment, the conveying device includes a conveying line. The conveying line can be a conveying structure formed by a conveying roller driven by a motor cooperating with a conveyor belt, or a conveying structure formed by articulated conveying chain links driven by a motor, or an AGV conveying cart, which can realize conveying in at least one direction and can support and ensure the stability of the structure to be assembled.

[0099] By arranging a conveying device in the battery assembly system, the structure to be assembled of the battery 1 can be gradually conveyed to each corresponding station of each assembly device, so as to simplify the assembly process of the battery 1 and facilitate the overall assembly of the battery 1.

[0100] The purpose of the tab welding device is to form the tab portion 21 after pre-welding the tab pieces, and it can be an ultrasonic welding device, which can ensure that the tab portion 21 is welded in a stable clamped state. The shell loading device is a pushing mechanism or a clamping mechanism, which can stably move the electrode assembly 20 towards the open end 12 of the housing 10a and enter the accommodation cavity 11 through the open end 12. Similarly, the tab passing device can adopt a clamping structure or a guiding structure, which can guide the tab portion 21 to pass through the through hole 14 smoothly without interfering with the housing 10a. The purpose of the terminal welding device is to realize the welding of the tab portion 21 and the terminal 15, and it can be a laser welding device. The purpose of the bottom cover welding device is to realize the circumferential edge welding of the bottom cover 30 and the open end 12 of the housing 10a, and it is also a laser welding device.

[0101] In addition, the assembly device is not limited to including a tab welding device, a shell loading device, a tab passing device, a terminal welding device, and a bottom cover welding device. Exemplarily, when the number of electrode assemblies 20 is multiple, for example, two, the assembly device further includes a pairing device, and the pairing device is used to stack a plurality of electrode assemblies 20 so that the tab pieces of the two electrode assemblies 20 are substantially opposite, so that the conveying structure can convey the paired electrode assemblies 20 to the tab welding device for welding the tab pieces to facilitate the formation of the tab portion 21. Another example is that in order to ensure the reliability of the battery assembly process, a dust removal and NG detection station can also be added between any two adjacent stations, which is not limited in this embodiment.

[0102] In some embodiments, the tab cutting mechanism can cut the tabs 21 of the electrode assembly 20 so that the tabs 21 have corresponding shapes and can pass through the through holes 14 when the electrode assembly 20 is inserted into the housing, thereby enabling the electrode assembly 20 and the housing 10a to be assembled to form the battery 1.

[0103] The present application provides a tab cutting mechanism 10, which can be used to cut the tabs 21 of the electrode assembly 20.

[0104] According to some embodiments of the application, as Figures 2 to 4 shown, the tab cutting mechanism 10 includes a support structure 100, a cutter assembly 200, an electrode assembly positioning component 300, and a first driving component 400.

[0105] Among them, the cutter assembly 200 can include a first member 210 and a second member 220. The first member 210 can be installed on the support structure 100. The electrode assembly positioning component 300 can be configured to support and position the main body 22 of the electrode assembly 20, and the first member 210 can be used to support the tabs 21 of the electrode assembly 20. The first driving component 400 can be installed on the support structure 100 and connected to the second member 220, and is configured to drive the second member 220 to move so that the second member 220 cooperates with the first member 210 to cut the tabs 21.

[0106] Optionally, at least one of the first member 210 and the second member 220 can be provided with a cutter and has a cutting edge corresponding to the tabs 21, and the cutter assembly 200 can use the cutting edge to cut the tabs 21.

[0107] Among them, the second member 220 can move back and forth along a preset direction, so as to approach or move away from the first member 210, and the preset direction can be as Figures 2 to 4 shown by the direction of arrow A.

[0108] Optionally, the shapes of the first member 210 and the second member 220 correspond to the shape of the required tabs 21, so that after the first member 210 and the second member 220 cooperate to cut the tabs 21, the tabs 21 with corresponding shapes can be obtained.

[0109] Optionally, the electrode assembly positioning component 300 can fix the electrode assembly 20 at the corresponding cutting position of the cutter assembly 200, so that during the cutting process of the tabs 21, the tabs 21 of the electrode assembly 20 can be placed on the first member 210, and then the first driving component 400 can drive the second member 220 to approach the tabs 21, so that the first member 210 and the second member 220 cooperate to cut the tabs 21 into the required shape.

[0110] By adopting the tab cutting mechanism 10 to cut the tabs 21 of the electrode assembly 20, and setting a first driving component 400 in the tab cutting mechanism 10 to enable the second component 220 to cooperate with the first component 210 to cut the tabs 21, it is convenient to cut the tabs 21 neatly, making the tabs 21 more regular, and can solve the problems of low alignment, dislocation, and inconsistent external dimensions of the tabs 21, so as to facilitate adding the housing 10a around the electrode assembly 20 later, thereby improving the yield rate of the battery 1.

[0111] According to some embodiments of the application, such as Figures 4 to 6 As shown, the first component 210 may include a first support surface 211 and a first side surface 212. A first cutting edge 213 may be formed at the connection of the first support surface 211 and the first side surface 212. The first support surface 211 is used to support the tabs 21 of the electrode assembly 20.

[0112] Through the above settings, the first support surface 211 can support the tabs 21 of the electrode assembly 20, making the tabs 21 more stable when being cut. And when the first driving component 400 drives the second component 220 to approach the first component 210, it can press the part of the tabs 21 that extends beyond the first support surface 211, so that the first cutting edge 213 can cut the tabs 21, thereby regularizing the shape of the tabs 21.

[0113] According to some embodiments of the application, such as Figures 7 to 8 As shown, the second component 220 may include a second pushing surface 221 and a second side surface 222. A second cutting edge 223 may be formed at the connection of the second pushing surface 221 and the second side surface 222. The second pushing surface 221 can be used to contact and push the waste of the cut tabs 21.

[0114] By setting the second cutting edge 223, when the second pushing surface 221 approaches the waste of the tabs 21, the second cutting edge 223 can cut the part of the tabs 21 that extends beyond, thereby facilitating regularizing the shape of the tabs 21.

[0115] According to some embodiments of the application, the first cutting edge 213 or the second cutting edge 223 can be set separately, or the first cutting edge 213 and the second cutting edge 223 can be set at the same time. If the first cutting edge 213 and the second cutting edge 223 are set at the same time, during the process that the first driving component 400 drives the second component 220 to approach the tabs 21 and cut the tabs 21, the first support surface 211 and the second pushing surface 221 are misaligned with each other, so that the first cutting edge 213 and the second cutting edge 223 are misaligned with each other and cooperate to cut the tabs 21. Among them, the first support surface 211 can support the part of the tabs 21 that needs to be retained, and the second pushing surface 221 contacts and pushes the waste part of the cut tabs 21.

[0116] According to some embodiments of the application, as Figures 6 to 8 shown, the second side surface 222 may include a recessed portion 2221 recessed away from the electrode assembly positioning assembly 300. Wherein, the recessed portion 2221 can be adapted to the shape of the tab portion 21, so that the second cutting edge 223 formed by the second side surface 222 and the second pushing surface 221 can be adapted to the shape of the tab portion 21, and the first member 210 and the recessed portion 2221 can cooperate with each other, so that when cutting the tab portion 21, a part of the first member 210 can be embedded in the recessed portion 2221, and the first cutting edge 213 and the second cutting edge 223 can be misaligned with each other to cut the tab portion 21.

[0117] Optionally, as Figures 6 to 8 shown, the second side surface 222 of the second cutting edge 223 may have a corresponding first flat portion 2222, and the recessed portion 2221 is disposed at the middle position of the first flat portion 2222, and the recessed portion 2221 is farther away from the electrode assembly positioning assembly 300 than the first flat portion 2222. Wherein the first flat portion 2222 and the connection of the recessed portion 2221 to the second pushing surface 221 together form the second cutting edge 223.

[0118] According to some embodiments of the application, as Figures 5 to 6 shown, the first side surface 212 may include a protruding portion 2121 protruding away from the electrode assembly positioning assembly 300. Wherein, the protruding portion 2121 can also be adapted to the shape of the required tab portion 21 to support the tab portion 21.

[0119] Optionally, as Figure 5 shown, the first side surface 212 may further include two flat portions 2122, and the two flat portions 2122 may be respectively located on both sides of the protruding portion 2121. The two flat portions 2122 are closer to the electrode assembly positioning assembly 300 than the protruding portion 2121. Wherein, the two flat portions 2122 and the connection of the protruding portion 2121 to the first supporting surface 211 together constitute the first cutting edge 213.

[0120] Therefore, when the tab portion 21 to be cut is placed on the first supporting surface 211, the recessed portion 2221 and the protruding portion 2121 can correspond to the correct shape of the tab portion 21, and the two flat portions 2122 and the first flat portion 2122 can correspond to both sides of the root of the tab portion 21. So when the first cutting edge 213 and the second cutting edge 223 cut the tab portion 21, the corresponding parts of the first cutting edge 213 and the second cutting edge 223 of the two flat portions 2122 can cut both sides of the root of the tab portion 21, so as to more effectively regularize the shape of the tab portion 21 to facilitate adding a housing around the electrode assembly 20 later.

[0121] According to some embodiments of the application, Figure 6 As shown, the first component 210 may further include a first component body 214, and the first component body 214 may include a first main body support surface 2141 and a first transition surface 2142 extending from the first main body support surface 2141 toward the first support surface 211, and the portion of the first transition surface 2142 connected to the first support surface 211 gradually moves away from the electrode assembly positioning component 300 as it gradually moves away from the first main body support surface 2141. Among them, the first main body support surface 2141 is used to support and place a part of the electrode assembly 20, and the first transition surface 2142 can be used to gather the root of the pole ear portion 21.

[0122] Optionally, the first main body support surface 2141 may be lower than the first support surface 211 in a preset direction, and the relative heights of the first support surface 211 and the first main body support surface 2141 may correspond to the setting of the pole ear portion 21 of the electrode assembly 20, so that when the first main body support surface 2141 supports and places part of the electrode assembly 20, the pole ear portion 21 can be supported on the first support surface 211, thereby allowing the first support surface 211 and the first main body support surface 2141 to play a role in positioning and fixing the electrode assembly 20.

[0123] The first transition surface 2142 can be set according to the shape of the pole ear portion 21, so that the electrode assembly 20 is placed on a support surface of a main body 22. When the pole ear portion 21 of the electrode assembly 20 is placed on the first main body support surface 2141, the root of the pole ear portion 21 can rely on the first transition surface 2142.

[0124] By arranging the first transition surface 2142 to gradually move away from the electrode assembly positioning assembly 300 as it gradually moves away from the first main body support surface 2141, the first transition surface 2142 can retract the root of the pole ear portion 21 when the electrode assembly 20 is placed on the first main body support surface 2141, so that the pole ear portion 21 can be correctly placed on the first component 210 before cutting, so as to facilitate the cutting of the pole ear portion 21 and make it less likely for the pole ear portion 21 to be deformed during movement or cutting.

[0125] According to some embodiments of the application, Figures 9 to 10 As shown, the support structure 100 may include a first support frame 110, a second support frame 120, and a second drive assembly 130. The second drive assembly 130 may be connected between the first support frame 110 and the second support frame 120, and may be used to drive the second support frame 120 to move back and forth relative to the first support frame 110. The first member 210 and the first drive assembly 400 may both be mounted on the second support frame 120.

[0126] The second driving component 130 can be used to drive the first member 210 to approach or move away from the electrode assembly 20 placed on the electrode assembly positioning component 300 by driving the second support frame 120. In this way, before cutting the tab ear 21, the second driving component 130 can be used to drive the first member 210 to approach and closely adhere to the tab ear 21 of the electrode assembly 20. Also, after the tab ear 21 is cut, the second driving component 130 can be used to drive the first member 210 away from the tab ear 21 of the electrode assembly 20, so as to reduce the occurrence of damage and deformation of the tab ear 21 caused by rubbing against the tab ear 21 when moving the electrode assembly 20 subsequently.

[0127] Optionally, the first driving component 400 and the second member 220 can also be arranged on the second support frame 120, so as to facilitate the first driving component 400 to drive the second member 220 to move for cutting the tab ear 21.

[0128] By respectively arranging the first member 210 and the second member 220 on the second support frame 120, and arranging the second driving component 130 to drive the second support frame 120 to move back and forth relative to the first support frame 110, the second member 220 and the first member 210 can be aligned with the position of the tab ear 21, so as to facilitate the cutting of the tab ear 21.

[0129] According to some embodiments of the application, as Figure 9 shown, the second driving component 130 may include a motor 131, a speed reducer 132, a lead screw 133 and a floating joint 134. Among them, the motor 131 is a power supply device for supplying electrical energy to other components of the second driving component 130. The speed reducer 132 is a speed reduction transmission device, which is used to match the rotational speed and transmit torque between the motor 131 and the lead screw 133. The lead screw 133 is a motion mechanism that can transmit linear motion, and can enable the second driving component 130 to drive the second support frame 120 to drive the first member 210 to achieve linear motion. The floating joint 134 is used to connect the lead screw 133 and the second support frame 120, and can enable the lead screw 133 to drive the second support frame 120 to move.

[0130] Optionally, a linear slide rail 101 can also be arranged between the second support frame 120 and the first support frame 110. The linear slide rail 101 can guide the second support frame 120, so that the second support frame 120 can perform linear motion along a preset direction under the drive of the second driving component 130.

[0131] Through the above settings, the drive of the second driving component 130 can be made faster, and the movement of the second support frame 120 can also be made more accurate, so as to facilitate moving the first member 210 and the second member 220 to align with the tab ear 21, and thus facilitate the cutting of the tab ear 21.

[0132] According to some embodiments of the application, such as Figure 11 As shown, the cutter assembly 200 further includes an elastic pressing member 230. The elastic pressing member 230 is installed on the side of the second member 220 facing the first member 210, and is used to press the pole ear portion 21 of the electrode assembly 20 against the first member 210. Among them, the elastic pressing member 230 can be correspondingly arranged on the protruding portion 2121 of the first member 210, so that the elastic pressing member 230 can contact the pole ear portion 21 and press the pole ear portion 21 against the first member 210 when cutting the pole ear portion 21.

[0133] Optionally, the elastic pressing member 230 may include a pressing portion 231 and an elastic portion 232. Specifically, the pressing portion 231 can be used to contact and press the pole ear portion 21, and the shape of the pressing portion 231 can be adapted to the shape of the pole ear portion 21. The elastic portion 232 is used to support the pressing portion 231 to move back and forth along a preset direction.

[0134] When the elastic pressing member 230 does not contact the pole ear portion 21, the elastic portion 232 is in an uncompressed state. When the pressing portion 231 contacts the pole ear portion 21 and the second member 220 continues to move in the direction of the first member 210, the elastic portion 232 is in a compressed state. During this process, the pressing portion 231 presses the pole ear portion 21 tightly, so as to facilitate the cutting of the pole ear portion 21. After the cutting is completed, the first driving assembly 400 drives the second member 220 to move away from the first member 210 along the preset direction. During the rising process of the second member 220, the elastic portion 232 gradually returns from the compressed state, thereby driving the pressing portion 231 to return to its original position, so that the pressing portion 231 can press the pole ear portion 21 tightly before cutting when cutting the pole ear portion 21 next time.

[0135] Among them, the elastic portion 232 can be an elastic element such as a spring or a spring piece.

[0136] By providing the elastic pressing member 230 for pressing the pole ear portion 21 tightly when the second member 220 cuts the pole ear portion 21, the pole ear portion 21 is not likely to move or deform when the second member 220 cuts the pole ear portion 21, so that the pole ear portion 21 is more regular.

[0137] According to some embodiments of the application, such as Figure 8 As shown, the cutter assembly 200 further includes a blowing structure 240. The blowing structure 240 is arranged on the side of the second member 220 facing the first member 210, and is used to blow off the waste of the cut-off pole ear portion 21.

[0138] Optionally, such as Figure 8As shown, the blowing structure 240 may include a blowing port 241 facing the direction of the first member 210, which is used to blow air towards the first member 210 when cutting the pole ear portion 21, so as to blow off the waste of the pole ear portion 21 when cutting the pole ear portion 21. Optionally, the blowing port 241 may be disposed on the second pushing surface 221 of the second member 220 and is farther from the second side surface 222 than the elastic pressing member 230.

[0139] By providing the blowing structure 240 to blow off the waste of the pole ear portion 21 to be cut, it is possible to prevent the waste of the pole ear portion 21 from sticking to the pole ear portion 21, the first member 210 or the second member 220 after cutting, so as to reduce the situation that the waste of the pole ear portion 21 affects the subsequent cutting of the pole ear portion 21 and other subsequent processes.

[0140] According to some embodiments of the application, such as Figure 1 and Figure 10 As shown, the pole ear cutting mechanism 10 may further include a waste collection structure 500. The waste collection structure 500 may be installed on the support structure 100 and may include a collection cavity 510 with an opening. The opening is located on the side of the first member 210 away from the second member 220. The blowing structure 240 is used to blow the waste of the pole ear portion 21 towards the opening.

[0141] By providing the waste collection structure 500, the waste of the pole ear portion 21 blown off by the blowing structure 240 can be collected, so as to reduce the situation that the waste of the pole ear portion 21 scatters into component mechanisms such as the support structure 100 and the cutter assembly 200 and affects the operation of each component, thereby making the process of cutting the pole ear portion 21 more standardized.

[0142] According to some embodiments of the application, such as Figure 10 As shown, the waste collection structure 500 may be installed on the first support frame 110. Its opening may correspond to the second pushing surface 221 in a preset direction, and the first side surface 212 may be located above the opening in the preset direction, so that when the second member 220 and the first member 210 cooperate to cut the pole ear portion 21, the second pushing surface 221 can push the waste of the pole ear portion 21 into the opening, and the blowing structure 240 can also blow the waste of the pole ear portion 21 into the opening.

[0143] According to some embodiments of the application, such as Figures 4 to 11 As shown, the number of the first members 210 may be two, and the two first members 210 may be used to respectively support the two pole ear portions 21 of the electrode assembly 20. The second member 220 may also include two second cutting edges 223, and the two second cutting edges 223 are used to cooperate with the two first members 210 respectively to cut the two pole ear portions 21 of the electrode assembly 20.

[0144] Optionally, the number of the recessed portions 2221 of the second member 220 and the elastic pressing members 230 may also be two. The two recessed portions 2221 and the elastic pressing members 230 are respectively arranged corresponding to the protruding portions 2121 of the two first members 210, so as to facilitate the cooperation between the second member 220 and the two first members 210 to cut the pole ears 21.

[0145] Optionally, the openings of the waste collection structure 500 may also be two. The two openings are respectively arranged on the side of the first member 210 away from the second member 220. Thus, when cutting two poles, the second pushing surface 221 of the second member 220 can push the pole ear waste corresponding to the two pole ears 21 into the two openings.

[0146] By arranging two second cutting edges 223 to cooperate with the two first members 210 to cut the two pole ears 21 of the electrode assembly 20, the two pole ears 21 of the electrode assembly 20 can be cut simultaneously, so that the cutting time of the pole ears 21 can be shortened.

[0147] According to some embodiments of the application, as Figures 9 to 10 shown, the first driving assembly 400 may include a cylinder 410. The cylinder 410 can drive the second member 220 to perform a reciprocating linear motion. Since the cylinder 410 has a simple structure and is good at driving other components to perform a reciprocating linear motion, it is particularly suitable for the parallel transportation of products and workpieces. Moreover, the air source for the transmission of the cylinder 410 is convenient and it has good adaptability to the working environment. Therefore, by using the cylinder 410, the cutting process of the pole ears 21 can be standardized and systematized, and the cost of the pole ear cutting mechanism 10 can also be reduced, and the reliability of the pole ear cutting mechanism 10 can be improved.

[0148] According to some embodiments of the application, the electrode assembly positioning assembly 300 may also be arranged to convey the electrode assembly 20 in the direction towards the cutter assembly 200.

[0149] Optionally, as Figure 7 , Figure 8 and Figure 12 shown, the electrode assembly positioning assembly 300 may include a fixture 320. The conveying line of the conveying device may include a conveyor belt 310. The electrode assembly 20 may be placed on the conveyor belt 310, and the fixture 320 can clamp the electrode assembly 20 to fix the electrode assembly 20 on the conveyor belt 310.

[0150] As Figure 7 , Figure 8 and Figure 12As shown, the conveying direction of the conveyor belt 310 can be as shown by the direction B in the figure. The conveyor belt 310 drives the fixture 320 to drive the electrode assembly 20 to move to the position corresponding to the ear cutting mechanism 10, so that the ear cutting mechanism 10 can cut the ear part 21. After cutting, the conveyor belt 310 will continue to drive the fixture 320 along the conveying direction to drive the electrode assembly 20 away from the position corresponding to the ear cutting mechanism 10, and transport the electrode assembly 20 to other equipment for other process treatments.

[0151] Optionally, the conveying device may include a third driving component 330. The third driving component 330 can drive the conveyor belt 310 and the fixture 320 to be conveyed in the direction towards the cutter assembly 200, so as to transport the electrode assembly 20 to the corresponding cutting position of the cutter assembly 200 for cutting the ear part 21. The third driving component 330 can also drive the conveyor belt 310 and the fixture 320 to be conveyed in the direction away from the cutter assembly 200, so as to transport the electrode assembly 20 to other equipment for other process treatments after the ear part 21 is cut. Among them, the third driving component 330 can be motor-driven or other driving such as cylinder-driven, which is not limited in this embodiment.

[0152] According to some embodiments of the application, as Figure 12 shown, the present application provides a battery assembly system, which includes the ear cutting mechanism 10 in the above embodiment. Adding the ear cutting mechanism 10 in the battery assembly system can make the ear part 21 of the electrode assembly 20 in the battery more regular, so that it is convenient to assemble the electrode assembly 20 with the housing 10a to form a battery, thereby improving the yield rate of the battery.

[0153] According to some embodiments of the application, as Figures 2 to 12As shown, the tab cutting mechanism 10 includes a support structure 100, a cutter assembly 200, an electrode assembly positioning assembly 300, and a first driving assembly 400. The cutter assembly 200 may include a first member 210 and a second member 220. The first member 210 may be mounted on the support structure 100. The electrode assembly positioning assembly 300 may be configured to support and position the main body portion 22 of the electrode assembly 20. The first member 210 may be used to support the tab portion 21 of the electrode assembly 20. The first driving assembly 400 may be mounted on the support structure 100 and connected to the second member 220, and is configured to drive the second member 220 to move so that the second member 220 cooperates with the first member 210 to cut the tab portion 21. The first member 210 may include a first support surface 211 and a first side surface 212. A first cutting edge 213 may be formed at the connection of the first support surface 211 and the first side surface 212. The first support surface 211 is used to support the tab portion 21 of the electrode assembly 20. The second member 220 may include a second pushing surface 221 and a second side surface 222. A second cutting edge 223 may be formed at the connection of the second pushing surface 221 and the second side surface 222. The second pushing surface 221 may be used to contact and push the waste tab portion 21 to be cut off. The second side surface 222 may include a recessed portion 2221 recessed away from the electrode assembly positioning assembly 300. The first side surface 212 may include a protruding portion 2121 protruding away from the electrode assembly positioning assembly 300. The first side surface 212 may further include two planar portions 2122, and the two planar portions 2122 may be respectively located on both sides of the protruding portion 2121. The first member 210 may further include a first member main body 214. The first member main body 214 may include a first main body portion support surface 2141 and a first transition surface 2142 extending from the first main body portion support surface 2141 toward the first support surface 211. The portion of the first transition surface 2142 connected to the first support surface 211 gradually moves away from the electrode assembly positioning assembly 300 as it gradually moves away from the first main body portion support surface 2141. The support structure 100 may include a first support frame 110, a second support frame 120, and a second driving assembly 130. The second driving assembly 130 may be connected between the first support frame 110 and the second support frame 120 and may be used to drive the second support frame 120 to move back and forth relative to the first support frame 110. Both the first member 210 and the first driving assembly 400 may be mounted on the second support frame 120. The cutter assembly 200 further includes an elastic pressing member 230. The elastic pressing member 230 is mounted on the side of the second member 220 facing the first member 210 and is used to press the tab portion 21 of the electrode assembly 20 against the first member 210. The cutter assembly 200 further includes a blowing structure 240. The blowing structure 240 is disposed on the side of the second member 220 facing the first member 210 and is used to blow off the waste tab portion 21 to be cut off.The tab cutting mechanism 10 may further include a waste collection structure 500. The waste collection structure 500 can be installed on the support structure 100 and may include a collection cavity 510 with an opening. The opening is located on the side of the first member 210 away from the second member 220. The blowing structure 240 is used to blow the waste tabs 21 of the tab portion towards the opening. The number of the first members 210 can be two, and the two first members 210 are used to support the two tab portions 21 of the electrode assembly 20 respectively. The second member 220 may also include two second cutting edges 223, and the two second cutting edges 223 are used to cooperate with the two first members 210 respectively to cut the two tab portions 21 of the electrode assembly 20. The first driving assembly 400 may include a cylinder 410. The electrode assembly positioning assembly 300 may also be configured to convey the electrode assembly 20 in the direction towards the cutter assembly 200.

[0154] In some embodiments, the battery 1 includes a housing 10a, a bottom cover 30, and an electrode assembly 20. The housing 10a has an open end 12, and a pole post 15 is provided on the wall of the housing 10a opposite to the open end 12. The pole post 15 has a through hole 14, and the housing 10a and the bottom cover 30 are connected to form a receiving cavity 11 communicating with the through hole 14. The active material coating portion of the electrode assembly 20 is disposed inside the housing 10a, and the tab 21 of the electrode assembly passes through the through hole 14 and is connected to the side of the pole post 15 away from the receiving cavity 11.

[0155] The battery assembly system may include a conveying device and an assembling device. The conveying device can be used to convey the structures to be assembled to each station of the assembling device. The stations of the assembling device are such as the tab cutting mechanism 10 described above. The stations of the assembling device may further include a tab welding device, a housing inserting device, a tab passing-through device, a pole post welding device, and a bottom cover welding device.

[0156] Specifically, the tab welding device can be used to weld a plurality of tab pieces of the electrode assembly to form the tab portion 21. The tab cutting mechanism 10 can be used to cut the tab portion 21 after the tab portion 21 is welded. The housing inserting device can be used to insert the electrode assembly 20 into the housing 10a from the open end 12. The tab passing-through device can be used to hold the tab portion 21 and pass it through the through hole 14 when the electrode assembly 20 is inserted into the housing 10a. The pole post welding device is used to weld the tab portion 21 passing through the through hole 14 to the side of the pole post 15 away from the receiving cavity 11. The bottom cover 30 welding device is used to weld the bottom cover 30 to the open end 12 of the housing 10a.

[0157] In summary, the embodiments of the present application can solve the problems of low alignment, misalignment, and inconsistent shape of the tab portion 21, making the tab portion 21 more regular, so as to facilitate adding the housing 10a around the electrode assembly 20 subsequently, and can improve the yield rate of the battery.

[0158] The above are only embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. An ear cutting mechanism, characterized in that, it includes: a support structure; a cutter assembly, including a first member and a second member, the first member being mounted on the support structure; an electrode assembly positioning assembly, configured to support and position the main body of the electrode assembly, and the first member being used to support the ear part of the electrode assembly; a first driving assembly, mounted on the support structure and connected to the second member, configured to drive the second member to move, so that the second member cooperates with the first member to cut the ear part.

2. The ear cutting mechanism according to claim 1, characterized in that, the first member includes a first support surface and a first side surface, and a first cutting edge is formed at the connection of the first support surface and the first side surface, and the first support surface is used to support the ear part of the electrode assembly.

3. The ear cutting mechanism according to claim 1, characterized in that, the second member includes a second pushing surface and a second side surface, and a second cutting edge is formed at the connection of the second pushing surface and the second side surface, and the second pushing surface is used to contact and push the waste ear part to be cut off.

4. The ear cutting mechanism according to claim 3, characterized in that, the second side surface includes a recessed portion recessed away from the electrode assembly positioning assembly.

5. The ear cutting mechanism according to claim 2, characterized in that, the first side surface includes a protruding portion protruding away from the electrode assembly positioning assembly; the first side surface further includes two flat portions, and the two flat portions are respectively located on both sides of the protruding portion.

6. The ear cutting mechanism according to claim 2, characterized in that, the first member further includes a first member body, the first member body includes a first main body portion support surface and a first transition surface extending from the first main body portion support surface towards the first support surface, and the portion of the first transition surface connected to the first support surface gradually moves away from the electrode assembly positioning assembly as it gradually moves away from the first main body portion support surface.

7. The ear cutting mechanism according to claim 1, characterized in that, the cutter assembly further includes an elastic pressing member, and the elastic pressing member is mounted on the side of the second member facing the first member, and is used to press the ear part of the electrode assembly against the first member.

8. The ear cutting mechanism according to claim 1, characterized in that, the support structure includes a first support frame, a second support frame and a second driving assembly; the second driving assembly is connected between the first support frame and the second support frame, and is used to drive the second support frame to move back and forth relative to the first support frame; the first member and the first driving assembly are both mounted on the second support frame.

9. The ear cutting mechanism according to claim 8, characterized in that, the cutter assembly further includes a blowing structure, and the blowing structure is arranged on the side of the second member facing the first member, and is used to blow off the waste ear part to be cut off.

10. The ear cutting mechanism according to claim 9, characterized in that, The tab cutting mechanism further includes a waste collection structure, which is installed on the support structure and includes a collection cavity with an opening located on the side of the first member away from the second member; The blowing structure is used to blow the tab waste towards the opening.

11. The tab cutting mechanism according to any one of claims 1-8, characterized in that, The first driving component includes a cylinder; and / or The number of the first members is two, and the two first members are used to respectively support the two tabs of the electrode assembly; the second member includes two second blades, and the two second blades are used to cooperate with the two first members respectively to cut the two tabs of the electrode assembly; and / or The electrode assembly positioning component is further arranged to convey the electrode assembly towards the cutter assembly.

12. A battery assembly system, characterized in that, It includes the tab cutting mechanism according to any one of claims 1 to 11.

13. The battery assembly system according to claim 12, characterized in that, The battery includes a housing, a bottom cover and an electrode assembly; the housing has an open end, a pole post is provided on the wall of the housing opposite to the open end, the pole post has a through hole, and the housing and the bottom cover are connected to form a receiving cavity communicating with the through hole; the active material coating part of the electrode assembly is arranged in the housing, and the tab of the electrode assembly passes through the through hole and is connected to the side of the pole post away from the receiving cavity; The battery assembly system includes a conveying device and an assembling device, and the conveying device is used to convey the structures to be assembled to each station of the assembling device; the stations of the assembling device further include a tab welding device, a housing inserting device, a tab passing device, a pole post welding device and a bottom cover welding device; Among them, the tab welding device is used to weld a plurality of tab pieces of the electrode assembly to form tabs; the tab cutting mechanism is used to cut the tabs after the tabs are welded; the housing inserting device is used to insert the electrode assembly into the housing from the open end; the tab passing device is used to hold the tabs and pass them through the through hole when the electrode assembly is inserted into the housing; the pole post welding device is used to weld the tabs passing through the through hole to the side of the pole post away from the receiving cavity; the bottom cover welding device is used to weld the bottom cover to the open end of the housing.

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