Pole piece, cutter assembly, production line, method, battery monomer, device and electric equipment

Abstract

The invention relates to the technical field of batteries, and discloses a pole piece, a cutter assembly, a production line, a method, a battery monomer, a device and electric equipment.The pole piece comprises a current collector and an insulating coating, and the current collector comprises a main body part and a tab located at one end of the main body part in the first direction; the main body part is provided with a first surface, a second surface and a first side surface, the first surface and the second surface are oppositely arranged in a second direction, the first side surface is connected to the same side of the first surface and the second surface and is adjacent to the tab, at least part of the first surface, at least part of the second surface and the first side surface are coated with the insulating coating, and the first direction is orthogonal to the second direction. According to the pole piece disclosed by the embodiment of the invention, the insulating coatings are arranged on the first side surface, the first surface and the second surface of the main body part, so that the probability of short circuit of large-surface areas and side surface areas of adjacent pole pieces can be reduced, the reliability of the pole piece is improved, and the potential safety hazard is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a pole piece, a cutter assembly, a production line, a method, a battery cell, a device and an electrical equipment. Background Art

[0002] In the related art, the current collector of the electrode sheet is cut out of the electrode ear, and the positive electrode sheet and the negative electrode sheet are wound together, so there is a risk of short circuit in the cutting area, which poses a safety hazard. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a pole piece, which has good insulation effect and can reduce safety hazards.

[0004] The present application further proposes a cutter assembly for cutting the above-mentioned pole pieces.

[0005] The present application also proposes a pole piece production line using the above-mentioned cutter assembly.

[0006] The present application further proposes a method for processing the above-mentioned pole piece.

[0007] The present application also proposes a battery cell using the above-mentioned pole piece.

[0008] The present application also provides a battery device having the battery cell.

[0009] The present application further proposes an electrical device having the above battery device.

[0010] In the first aspect, the present application proposes a pole piece, comprising: a current collector and an insulating coating, the current collector comprising a main body and a pole ear located at one end of the main body in a first direction, the main body having a first surface and a second surface arranged opposite to each other in a second direction, and a first side surface connected to the same side of the first surface and the second surface and adjacent to the pole ear, the insulating coating is applied to at least a portion of the first surface, at least a portion of the second surface and the first side surface, and the first direction is orthogonal to the second direction.

[0011] According to the pole piece of the embodiment of the present application, by providing an insulating coating on the first side surface, the first surface and the second surface of the main body, the probability of short circuit between the large surface area and the side area of ​​adjacent pole pieces can be reduced, thereby improving the reliability of the pole piece and reducing safety hazards.

[0012] According to some embodiments of the present application, the main body includes: an active area and an insulating area arranged in sequence in a first direction, and the insulating coating is applied to the insulating area.

[0013] In the above technical solution, the main body includes an active area (i.e., other parts of the above main body) and an insulating area (i.e., at least part of the above main body). When the pole ear is not cut out of the pole ear, the pole ear and the insulating area are coated with an insulating coating. After cutting, the pole ear is exposed and used for the power output of the pole piece, while the insulating area is still coated with an insulating coating to achieve insulation protection of the first surface and the second surface of the main body and the area not opposite to the diaphragm, thereby reducing the probability of short circuit between the large surfaces of adjacent pole pieces and improving the safety of the pole pieces.

[0014] It should be pointed out that by setting an insulating area, when the width of the diaphragm between adjacent pole pieces is smaller than the main body, insulation between the large surfaces of the pole pieces can be achieved through the insulating area, which can improve insulation stability and reliability, and reduce the diaphragm overhang phenomenon, resulting in the probability of short circuit in the battery cell, thereby improving reliability.

[0015] According to some embodiments of the present application, a side surface of the insulating region adjacent to the electrode ear is formed as a first side surface.

[0016] In the above technical solution, an insulating coating is provided on the surface of the main body adjacent to the pole ear (i.e. the above-mentioned cutting surface, the first side surface). The setting position of the insulating coating is more reasonable, which can improve the insulation protection effect between adjacent pole pieces and between the main body of one pole piece and the pole ear of another pole piece, thereby improving the reliability of the battery cell.

[0017] According to some embodiments of the present application, the insulating coating is applied to a portion of the first surface defining the insulating region, a portion of the second surface defining the insulating region, and the first side surface.

[0018] In the above technical scheme, the insulating coating can be divided into three parts, and the three parts can be coated on three surfaces respectively, or coated on the first surface and the second surface. In the process of cutting the pole ear, the insulating coating on the first side is set by shaping, which can reduce the processing difficulty, improve the processing efficiency and reduce the processing cost.

[0019] According to some embodiments of the present application, a thickness D1 of the insulating coating on the first surface and the second surface and a thickness D2 of the current collector satisfy: 4≤D1 / D2≤10.

[0020] In the above technical scheme, not only can the thickness of the insulating coating be avoided from being too large, so that the thickness of the pole piece is more reasonable to take into account the energy density of the battery cell, but also the thickness of the insulating coating can be avoided from being too small. In the embodiment of cutting the pole ear and simultaneously shaping the insulating coating on the first side, a more reasonable amount of cutting residue can be involved in the cutting and shaping to improve the molding quality of the insulating coating on the first and side surfaces, so that the insulating protection effect of the insulating coating is more stable and reliable.

[0021] In the second aspect, the present application proposes a cutter assembly, which is suitable for cutting the pole pieces to be cut to obtain the pole pieces in the above-mentioned embodiment. The cutter assembly includes: a first cutter and a second cutter, the first cutter and the second cutter are located on both sides of the current collector in the second direction, and are suitable for cutting off the current collector and guiding the insulating coating to be shaped toward the first side.

[0022] According to the cutter assembly of the embodiment of the present application, by setting the first cutter and the second cutter, the first cutter and the second cutter can act synchronously on the pole piece to be cut to realize the cutting of the pole ear, and during the cutting process, the first cutter and the second cutter can realize the cutting of the first coating and the second coating respectively along the first direction during the cutting process, and guide the shaping, and during the pole piece processing, the first coating and the second coating are directly cut to realize the shaping of the third coating, which can reduce the processing difficulty, save processing steps, and improve processing efficiency.

[0023] According to some embodiments of the present application, the first cutter has a first cutting portion, and the second cutter has a second cutting portion, and the first cutting portion and the second cutting portion are suitable for cutting the electrode to be cut along the second direction.

[0024] In the above technical solution, the first cutting portion and the second cutting portion cut the electrode to be cut in the second direction, so as to crush the first coating and the second coating respectively, so that the cross-section of the current collector can be more uniform, and the cutting shaping can be achieved during the cutting process to avoid the crushing material falling off during the cutting process, so as to improve the coating effect of the third coating on the first side, thereby improving the insulation effect.

[0025] According to some embodiments of the present application, the first cutter and the second cutter have a shaping portion, which is located on one side of the first cutting portion in the second direction, or on one side of the second cutting portion in the second direction, and is used to shape the pole piece.

[0026] In the above technical solution, during the cutting process of the first cutting part and the second cutting part, the crushed material in the cutting process can be accumulated in front of the cross-section of the main body in the first direction under the guidance of the first shaping part and / or the second shaping part, that is, the insulating coating can be shaped by at least one shaping part to improve the insulating effect of the insulating coating, thereby improving the reliability of the pole piece.

[0027] According to some embodiments of the present application, the shaping portion is configured as a shaping surface, and an angle formed between the shaping surface and the second direction is 30°~60°.

[0028] In the above technical scheme, on the one hand, the angle formed by the shaping surface and the second direction is not less than 30°, so that the amount of insulating material used to shape the third coating produced during the cutting process is more reasonable, so as to improve the coating effect on the first side, thereby improving the insulation effect; on the other hand, the angle formed by the shaping surface and the second direction is not greater than 60°, which can reduce the probability of deformation of the pole piece during the cutting process and improve the cutting quality.

[0029] According to some embodiments of the present application, the shaping portion of the first cutter and the shaping portion of the second cutter are symmetrically arranged along the second direction.

[0030] In the above technical solution, a first shaping portion is provided on the first cutter, and a second shaping portion is provided on the second cutter, and the first shaping portion and the second shaping portion are symmetrically arranged, so that during the pole piece cutting and shaping process, the first coating and the second coating can be shaped to the first side surface, so that the third coating can have a better covering effect on the main body, thereby further improving the insulation effect.

[0031] In a third aspect, an embodiment of the present application discloses a pole piece production line, including: the cutter assembly in the above embodiment, the cutter assembly is arranged at a pole piece cutting station.

[0032] According to the pole piece production line of the embodiment of the present application, the above-mentioned cutting knife assembly is adopted, and the pole piece cutting can be realized at the pole piece cutting station. While cutting out the pole ear, the insulating coating can be shaped, and during the shaping process, the third coating is shaped to realize the processing of the insulating coating on the first side, the first surface and the second surface of the main body, thereby improving the insulation effect and reliability of the pole piece.

[0033] In a fourth aspect, an embodiment of the present application discloses a method for processing a pole piece, the processing method comprising: Move the electrode cutting station among the electrodes to be cut; The cutter assembly is controlled to cut the electrode piece to be cut; wherein the first cutter and the second cutter cut the electrode piece to be cut along the second direction, and the cutting amount of the electrode piece to be cut by the first cutter and the second cutter along the second direction is consistent.

[0034] According to the processing method of the pole piece of the embodiment of the present application, the cutting knife assembly is controlled at the pole piece cutting station to cut the pole piece to be cut, and during the cutting process, the cutting amounts of the first cutter and the second cutter in the second direction are controlled to be consistent, so that the shaping effect of the insulating coating shaped on the first side surface can be better, the cross-sectional shielding effect of the current collector can be better, and the insulation protection effect can be better.

[0035] In a fifth aspect, an embodiment of the present application discloses a battery cell, comprising: an electrode assembly and a shell, wherein the electrode assembly is disposed in the shell, and the electrode assembly comprises: a first pole piece and a second pole piece, wherein at least one of the first pole piece and the second pole piece is constructed as the pole piece in the above embodiment.

[0036] According to the battery cell of the embodiment of the present application, the first pole piece can be a positive pole piece, and the corresponding second pole piece can be a negative pole piece, and at least one of the positive pole piece and the negative pole piece is constructed as the pole piece in the above embodiment, which can reduce the probability of short circuit in the electrode assembly inside the battery cell to improve the reliability of the battery cell.

[0037] In a sixth aspect, an embodiment of the present application discloses a battery device, including: a battery cell in the above embodiment.

[0038] In a seventh aspect, an embodiment of the present application discloses an electrical device, including: the battery device in the above embodiment.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application; Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application; Figure 3 is a schematic diagram of a battery cell according to an embodiment of the present application; Figure 4 is a schematic diagram of a cutter assembly and a pole piece according to an embodiment of the present application (before cutting); Figure 5 is a schematic diagram of a cutter assembly and a pole piece according to an embodiment of the present application (after cutting); Figure 6 is a cross-sectional schematic diagram of a cutter assembly and a pole piece according to an embodiment of the present application; Figure 7 is a schematic diagram of an angle of a pole piece according to an embodiment of the present application; Figure 8 is a schematic diagram of a pole piece according to an embodiment of the present application from another angle; Fig. 9 is a cross-sectional schematic diagram of a pole piece according to an embodiment of the present application; Fig.10 is a schematic front view of a pole piece according to an embodiment of the present application; Fig.11 is a schematic diagram of a pole piece production line according to an embodiment of the present application; Fig.12 It is a flow chart of a processing method according to an embodiment of the present application.

[0041] Reference numerals: Pole piece 100, pole piece to be cut 10a, Current collector 10, main body 11, active area 111, insulating area 112, tab 12, Insulation coating 20, first coating 21, second coating 22, third coating 23, first surface a, second surface b, first side surface c, The cutter assembly 200 includes a first cutter 210, a first cutting portion 211, a first shaping portion 212, a second cutter 220, a second cutting portion 221, and a second shaping portion 222. Pole production line 300, pole cutting station 310, Battery cell 400, electrode assembly 410, housing 420, Battery device 500, power-consuming device 600, motor 700, controller 800, The first direction is X, and the second direction is Y. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0044] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The term "and / or" in this application is only 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 at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0050] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0051] The term “plurality” used in this application refers to two or more (including two).

[0052] The battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0053] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0054] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, and the multiple battery cells may form a battery column, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar.

[0055] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells, such as forming a battery column.

[0056] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0057] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0058] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0059] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0060] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0061] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0062] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0063] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical equipment using the battery devices.

[0064] Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0065] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0066] Please refer to Figure 1 FIG1 is a schematic diagram of an electric device 600 provided in some embodiments of the present application. A battery device 500 is provided inside the vehicle, and the battery device 500 can be provided at the bottom, head, or tail of the vehicle. The battery device 500 can be used to power the vehicle, for example, the battery device 500 can be used as an operating power source for the vehicle.

[0067] The vehicle may further include a controller 800 and a motor 700 . The controller 800 is used to control the battery device 500 to supply power to the motor 700 . The motor 700 serves as a load, for example, to meet the power requirements for starting, navigating and driving the vehicle.

[0068] In some embodiments of the present application, the battery device 500 can not only be used as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0069] Please refer to Figure 2 , Figure 2 A schematic diagram of a battery device 500 provided in some embodiments of the present application. The battery device 500 includes a box body, and the box body is used to accommodate a battery cell 400.

[0070] Among them, the box body is a component for accommodating the battery cell 400, and the box body provides a placement space for multiple battery cells 400. The box body can adopt a variety of structures. In some embodiments, the box body may include a tray and a cover plate, and the tray and the cover plate cover each other to define a placement space for accommodating the battery cell 400. The tray and the cover plate can be in various shapes, such as a cuboid, a cylinder, etc. The tray can be a hollow structure with one side open, and the cover plate can also be a hollow structure with one side open, and the open side of the cover plate covers the open side of the tray, so as to form a box body with a placement space. It can also be that the tray is a hollow structure with one side open, the cover plate is a plate-like structure, and the cover plate covers the open side of the tray, so as to form a box body with a placement space. As an example, the battery cell 400 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 400 of other shapes (such as a soft-pack battery cell), and there is no special limitation in this application.

[0071] In the battery device 500, there can be one or more battery cells 400. If there are more than one battery cell 400, the multiple battery cells 400 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 400 are both connected in series and in parallel. Multiple battery cells 400 can be connected in series, in parallel, or in mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole and accommodated in a box. Alternatively, all battery cells 400 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by all battery cells 400 is accommodated in a box.

[0072] like Figure 2 and Figure 3 As shown, the battery cell 400 is the smallest energy unit of the battery device 500 . The battery device 500 includes a plurality of battery cells 400 . The battery cell 400 includes a housing 420 , an end cap, and an electrode assembly 410 disposed in the housing 420 .

[0073] In some embodiments, the battery cell 400 may include: a shell 420 and an electrode assembly 410, the shell 420 is used to define a housing space with an installation port, the shell 420 may be a bag-shaped structure wrapped around the outside of the electrode assembly 410 of a soft-pack battery, or it may be constructed as a hard shell structure, and the electrode assembly 410 is arranged therein.

[0074] Exemplarily, the shell 420 may include a bottom plate and a side plate, the side plate is arranged around the bottom plate and defines a containing space with a mounting opening, the electrode assembly 410 and other functional components may be arranged in the containing space, the end cover is covered on the mounting opening of the shell 420 to isolate the internal environment of the battery cell 400 from the external environment, the shape of the end cover is adapted to the shape of the shell 420, the end cover may be supported by a material with a certain hardness and strength (such as aluminum alloy, carbon fiber plate), and the end cover may effectively protect the safety and reliability of the internal components of the shell 420 during extrusion and collision.

[0075] In some embodiments, the end cap or the housing 420 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 400 reaches a threshold value. The material of the end cap may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap, and the insulating member may be used to isolate the electrical connection components in the housing 420 from the end cap to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc., and an insulating sheet may also be provided between the electrode assembly 410 and the housing 420 to achieve insulation protection.

[0076] The shell 420 is a component used to cooperate with the end cap to form the internal environment of the battery cell 400, wherein the formed internal environment can be used to accommodate the electrode assembly 410, the electrolyte and other components. The shell 420 and the end cap can be independent components, and a mounting port can be set on the shell 420, and the internal environment of the battery cell 400 is formed by covering the opening of the end cap at the mounting port. The shell 420 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 420 can be determined according to the specific shape and size of the electrode assembly 410. The material of the shell 420 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0077] Electrode terminals may be further provided on the end cap or the shell 420, and the electrode assembly 410 is a component where an electrochemical reaction occurs in the battery cell 400. One or more electrode assemblies 410 may be contained in the shell 420. The electrode assembly 410 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 11 of the electrode assembly 410, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 12. The positive tab 12 and the negative tab 12 may be located together at one end of the main body 11 or at both ends of the main body 11, respectively. During the charge and discharge process of the battery device 500, the positive active material and the negative active material react with the electrolyte, and the tab 12 connects the electrode terminal to form a current loop.

[0078] like Fig.11 As shown, the pole piece 100 can be processed by a pole piece production line 300, and the pole piece production line 300 can have a plurality of stations, such as station 1 to station N, and at least one of the plurality of stations can be formed as a pole piece cutting station 310, combined with Fig.10 As shown, the collector 10 (foil) of the pole piece 100 is provided with a main body 11 and a pole ear part in sequence. The pole ear part can be cut by the pole piece cutting station 310 to obtain a pole ear 12. A diaphragm is provided between adjacent pole pieces 100. However, the size of the diaphragm is limited, and there may be errors during the processing. There is a certain probability that the diaphragm between adjacent pole pieces 100 is difficult to effectively cover the active area 111 (overhang phenomenon occurs), and even a short circuit phenomenon occurs. Based on this, in the prior art, an insulating area 112 needs to be further provided between the pole ear 12 and the active area 111 (the area coated with active material) of the main body 11, and an insulating coating 20 is coated in the insulating area 112 to achieve insulation protection between adjacent pole pieces 100.

[0079] However, although the insulating coating 20 applied in the insulating region 112 can reduce the probability of short circuit between adjacent pole pieces 100, in the process of cutting the pole ear 12 on the current collector 10, the current collector 10 will be exposed on one end surface of the insulating region 112 adjacent to the pole ear 12 (i.e., the cut surface), and there is still a probability of short circuit between adjacent pole pieces 100, and between the pole ear 12 of one pole piece 100 and the current collector 10 of another pole piece 100.

[0080] Based on this, the present application proposes a pole piece 100. By setting an insulating coating 20 on the first side surface c of the main body 11 facing the pole ear 12, and also setting an insulating coating 20 on the first surface a and the second surface b, the insulation protection effect of the pole piece 100 can be improved, and the probability of short circuit between adjacent pole pieces 100 can be further reduced, thereby reducing safety hazards and improving reliability.

[0081] like Fig.12 As shown, the processing method of the pole piece 100 of the embodiment of the present application can cut the pole piece 100a to be cut through the above-mentioned pole piece production line 300, and obtain the pole piece 100 that meets the above-mentioned insulation protection requirements.

[0082] Reference below Figure 1-Figure 12 A pole piece 100, a cutter assembly 200, a pole piece production line 300, a processing method, a battery cell 400, a battery device 500, and an electrical device 600 according to an embodiment of the present invention are described.

[0083] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the present application proposes a pole piece 100, comprising: a current collector 10 and an insulating coating 20, the current collector 10 comprises a main body 11 and a pole ear 12 located at one end of the main body 11 in a first direction, the main body 11 has a first surface a and a second surface b arranged opposite to each other in a second direction, and a first side surface c connected to the same side of the first surface a and the second surface b and adjacent to the pole ear 12, the insulating coating 20 is coated on at least a portion of the first surface a, at least a portion of the second surface b and the first side surface c, and the first direction is orthogonal to the second direction.

[0084] Among them, the first direction can be the width direction of the pole piece 100, and the second direction can be the thickness direction of the pole piece 100, and multiple pole pieces 100 are stacked or wound in the thickness direction to form an electrode assembly 410, and adjacent pole pieces 100 are respectively a positive pole piece and a negative pole piece, a diaphragm is arranged between the main body 11 of the positive pole piece and the main body 11 of the negative pole piece, and an insulating coating 20 is arranged at the width end of adjacent pole pieces 100 (that is, the insulating coating 20 is coated on at least a portion of the first surface a and at least a portion of the second surface b) to improve the insulation effect between adjacent pole pieces 100.

[0085] It is understandable that if Figure 4 , Figure 5 , Figure 8 and Fig.10As shown, the current collector 10 can be a metal foil, which is divided into a main body 11 and a pole ear 12. The pole piece 100a to be cut is the state of the pole piece 100 before the pole ear 12 is cut. Before the pole ear 12 is not cut, the current collector 10 is generally in a rectangular strip shape and includes a main body 11 and a pole ear portion arranged in sequence in a first direction. The entire pole ear portion and at least a portion of the main body 11 can be coated with an insulating coating 20, and the other portions of the main body 11 are coated with active materials, and then the pole ear portion is cut to obtain the pole ear 12, and the complete After cutting, the portion of the main body 11 coated with the insulating coating 20 forms a cutting surface (i.e., the first side surface c) on the side adjacent to the pole ear 12, and the current collector 10 is exposed on the cutting surface, while the width ends (i.e., the ends in the first direction) of the adjacent pole sheets 100 lead out the positive pole ear 12 and the negative pole ear 12 respectively, which makes it easy for the positive pole ear 12 to short-circuit with the exposed portion of the current collector 10 on the first side surface c of the negative pole sheet, and the negative pole ear 12 to short-circuit with the exposed portion of the positive pole sheet on the first side surface c, posing a safety hazard.

[0086] Based on this, combined Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the present application sets an insulating coating 20 on at least a portion of the first surface a of the main body 11 adjacent to the pole ear 12 and at least a portion of the second surface b adjacent to the pole ear 12, which can avoid short circuits between large surface areas of adjacent pole pieces 100 (i.e., the area with the largest area of ​​the pole ear 12 defined by the first surface a and the second surface b). Further, the insulating coating 20 is set on the first side surface c of the main body 11, and the insulating coating 20 is set on the cut surface formed after the pole ear 12 is cut out. Insulation protection can be achieved on the side areas of adjacent pole pieces 100, thereby reducing the probability of short circuits between the pole ear 12 of one pole piece 100 and the main body 11 of another pole piece 100 in adjacent pole pieces 100.

[0087] According to the pole piece 100 of the embodiment of the present application, by providing an insulating coating 20 on the first side surface c, the first surface a and the second surface b of the main body 11, the probability of short circuit between the large surface area and the side area of ​​adjacent pole pieces 100 can be reduced, thereby improving the reliability of the pole piece 100 and reducing safety hazards.

[0088] like Figure 8 and Fig.10 As shown, according to some embodiments of the present application, the main body 11 includes: an active area 111 and an insulating area 112 arranged in sequence in a first direction, and the insulating coating 20 is applied to the insulating area 112 .

[0089] That is to say, the main body 11 includes an active area 111 (i.e., other parts of the above-mentioned main body 11) and an insulating area 112 (i.e., at least part of the above-mentioned main body 11). When the pole ear 12 is not cut out from the pole ear portion, the pole ear portion and the insulating area 112 are coated with an insulating coating 20. After cutting, the pole ear 12 is exposed and used for the power output of the pole piece 100, while the insulating area 112 is still coated with the insulating coating 20, so as to realize insulation protection of the first surface a and the second surface b of the main body 11 and the area not opposite to the diaphragm, reduce the probability of short circuit between the large surfaces of the pole pieces 100 of adjacent pole pieces 100, and improve the safety of the pole pieces 100.

[0090] It should be pointed out that by setting the insulating area 112, when the width of the diaphragm between adjacent pole pieces 100 is smaller than the main body 11, the insulating area 112 can be used to achieve insulation between the large surfaces of the pole pieces 100, which can improve the insulation stability and reliability, and reduce the diaphragm overhang phenomenon, resulting in the probability of short circuit in the battery cell 400, thereby improving reliability.

[0091] Combination Figure 7 , Fig. 9 and Fig.10 As shown, according to some embodiments of the present application, a side surface of the insulating region 112 adjacent to the electrode tab 12 is formed as a first side surface c.

[0092] Specifically, the two surfaces of the main body 11 in the thickness direction (ie, the second direction) are the first surface a and the second surface b, respectively. The surface of the main body 11 adjacent to the tab 12 in the width direction is the first side surface c, and the insulating coating 20 is disposed on the first side surface c.

[0093] In this way, an insulating coating 20 is provided on the surface of the main body 11 adjacent to the pole ear 12 (i.e., the above-mentioned cutting surface, the first side surface c). The setting position of the insulating coating 20 is more reasonable, which can improve the insulation protection effect between adjacent pole pieces 100 and between the main body 11 of one pole piece 100 and the pole ear 12 of another pole piece 100, thereby improving the reliability of the battery cell 400.

[0094] like Figure 8 , Fig. 9 as well as Fig.10 As shown, according to some embodiments of the present application, the insulating coating 20 is applied to a portion of the first surface a defining the insulating region 112 , a portion of the second surface b defining the insulating region 112 , and the first side surface c.

[0095] Exemplarily, the insulating coating 20 may include: a first coating 21, a second coating 22 and a third coating 23, wherein the first coating 21 is coated on the first surface a, the second coating 22 is coated on the second surface b, and the third coating 23 is coated on the first side surface c.

[0096] Specifically, the first coating 21 and the second coating 22 can be pre-coated on the insulating area 112, and the third coating 23 can be shaped during the cutting process of the pole piece 100, or a process or station can be added after the pole piece 100 is cut to coat the insulating coating 20 on the first side c.

[0097] Thus, the insulating coating 20 can be divided into three parts, which can be coated on three surfaces respectively, or coated on the first surface a and the second surface b. In the process of cutting the pole ear 12, the third coating 23 on the first side surface c is set by shaping, which can reduce the processing difficulty, improve the processing efficiency and reduce the processing cost.

[0098] According to some embodiments of the present application, a thickness D1 of the insulating coating 20 on the first surface a and the second surface b and a thickness D2 of the current collector 10 satisfy: 4≤D1 / D2≤10.

[0099] Exemplarily, the thickness of the insulating coating 20 on the first surface a and the thickness of the insulating coating on the second surface b are both 4, 5, 6, 7, 8, 9 or 10 times the thickness of the current collector 10 .

[0100] In this way, not only can the thickness of the insulating coating 20 be avoided from being too large, so that the thickness size of the pole piece 100 is more reasonable to take into account the energy density of the battery cell 400, but also the thickness of the insulating coating 20 can be avoided from being too small. In the embodiment of cutting the pole ear 12 and simultaneously shaping the insulating coating 20 located on the first side c, a more reasonable amount of cutting residue can be involved in the cutting and shaping to improve the molding quality of the insulating coating 20 located on the first and side c, so that the insulating protection effect of the insulating coating 20 is more stable and reliable.

[0101] like Figure 4 , Figure 5 and Figure 6 As shown, the present application proposes a cutter assembly 200, which is suitable for cutting the pole piece 100a to be cut to obtain the pole piece 100 in the above embodiment. The cutter assembly 200 includes: a first cutter 210 and a second cutter 220, the first cutter 210 and the second cutter 220 are located on both sides of the current collector 10 in the second direction, and are suitable for cutting off the current collector 10 and guiding the insulating coating 20 to be shaped toward the first side surface c.

[0102] Specifically, the first cutter 210 and the second cutter 220 can cut the electrode piece 100a to be cut in the second direction, and in the process of cutting the electrode piece 100a to be cut by the first cutter 210 and the second cutter 220, the current collector 10 can be cut, and in the process of cutting the current collector 10, the insulating coating 20 (such as the first coating 21) located on the first surface a and the insulating coating 20 (such as the second coating 22) located on the second surface b can be shaped toward the first side c under the guidance of the first cutter 210 and the second cutter 220 to form an insulating coating 20 (such as the third coating 23) on the first side c.

[0103] It should be pointed out that, in the process of the cutter assembly 200 cutting the electrode piece 100a to be cut, in terms of microscopic mechanism, the first cutter 210 and the second cutter 220 can be pressed against the first coating 21 and the second coating 22 respectively, and while crushing the first coating 21 and the second coating 22 to deform them, the main body 11 (the foil is thin and easily brittle) can be broken under the action of the cutting pressure to form a cross section, and while the first cutter 210 and the second cutter 220 continue to move, the crushed material on the crushed first coating 21 and the crushed material on the second coating 22 can be guided to the front side of the cross section under the action of pressure, and the cross section can be shielded, that is, guided to the first side surface c, and accumulated on one side of the cross section of the main body 11, so as to achieve insulation protection on the first side surface c.

[0104] According to the cutter assembly 200 of the embodiment of the present application, by setting the first cutter 210 and the second cutter 220, the first cutter 210 and the second cutter 220 can act synchronously on the pole piece 100a to be cut to achieve the cutting of the pole ear 12, and during the cutting process, the first cutter 210 and the second cutter 220 can achieve the cutting of the first coating 21 and the second coating 22 respectively along the first direction during the cutting process, and guide the shaping. During the processing of the pole piece 100, the shaping of the third coating 23 is achieved directly through the first coating 21 and the second coating 22, which can reduce the processing difficulty, save processing steps, and improve processing efficiency.

[0105] Combination Figure 4 , Figure 5 and Figure 6 As shown, according to some embodiments of the present application, the first cutter 210 has a first cutting portion 211 , and the second cutter 220 has a second cutting portion 221 . The first cutting portion 211 and the second cutting portion 221 are suitable for cutting the electrode piece 100 a to be cut along the second direction.

[0106] Thus, the first cutting portion 211 and the second cutting portion 221 cut the electrode piece 100a to be cut in the second direction, so that the cross-section of the current collector 10 can be more uniform while crushing the first coating 21 and the second coating 22 respectively. In addition, the cutting shaping can be achieved during the cutting process to avoid the crushing material from falling off during the cutting process, so as to improve the coating effect of the third coating 23 on the first side c, thereby improving the insulation effect.

[0107] According to some embodiments of the present application, the first cutter 210 and the second cutter 220 have a shaping portion, which is located on one side of the first cutting portion 211 in the second direction, or on one side of the second cutting portion 221 in the second direction, and is used to shape the pole piece 100.

[0108] Exemplarily, the shaping portion may include a first shaping portion 212 formed on the first cutter 210 and a second shaping portion 222 formed on the second cutter 220, the first shaping portion 212 being located on one side of the first cutter 210 in the second direction, and the second shaping portion 222 being located on one side of the second cutter 220 in the second direction.

[0109] Therefore, during the cutting process of the first cutting portion 211 and the second cutting portion 221, the crushed material during the cutting process can be accumulated in front of the cross-section of the main body 11 in the first direction under the guidance of the first shaping portion 212 and the second shaping portion 222, that is, the insulating coating 20 can be shaped by at least one shaping portion to improve the insulating effect of the insulating coating 20, thereby improving the reliability of the pole piece 100.

[0110] According to some embodiments of the present application, the shaping portion is configured as a shaping surface, and an angle formed between the shaping surface and the second direction is 30°~60°.

[0111] Exemplarily, the shaping surface is a plane, and the angle between the shaping surface and the second direction can be 30°, 45°, 60°, etc.

[0112] Therefore, on the one hand, the angle between the shaping surface and the second direction is not less than 30°, so that the amount of insulating material used to shape the third coating 23 produced during the cutting process is more reasonable, so as to improve the coating effect on the first side c, thereby improving the insulation effect. On the other hand, the angle between the shaping surface and the second direction is not more than 60°, which can reduce the probability of deformation of the pole piece 100 during the cutting process and improve the cutting quality.

[0113] like Figure 4 and Figure 5 As shown, according to some embodiments of the present application, the shaping portion of the first cutter 210 and the shaping portion of the second cutter 220 are symmetrically arranged along the second direction.

[0114] That is to say, the first cutter 210 is provided with a first shaping portion 212, and the second cutter 220 is provided with a second shaping portion 222, and the first shaping portion 212 and the second shaping portion 222 are symmetrically arranged, so that during the cutting and shaping process of the pole piece 100, the first coating 21 and the second coating 22 can be shaped to the first side surface c, so that the third coating 23 can better cover the main body 11, so as to further improve the insulation effect.

[0115] like Figure 5 and Fig.11 As shown, an embodiment of the present application discloses a pole piece production line 300 , including: the cutter assembly 200 in the above embodiment, the cutter assembly 200 is arranged at a pole piece cutting station 310 .

[0116] According to the pole piece production line 300 of the embodiment of the present application, the above-mentioned cutting knife assembly 200 is adopted, and the pole piece 100 can be cut at the pole piece cutting station 310. While cutting out the pole ear 12, the insulating coating 20 can be shaped, and during the shaping process, the third coating 23 is shaped to realize the processing of the insulating coating 20 on the first side c, the first surface a and the second surface b of the main body 11, thereby improving the insulation effect and reliability of the pole piece 100.

[0117] like Fig.12 As shown, the embodiment of the present application further discloses a processing method of a pole piece 100, which is applicable to the pole piece production line 300, and the processing method includes: Move the electrode piece 100a to be cut to the electrode piece cutting station 310; Control the cutter assembly 200 to cut the pole piece 100a to be cut and shape the insulating coating 20 on the first side c; wherein the first cutter 210 and the second cutter 220 cut the pole piece 100a to be cut along the second direction, and the cutting amount of the pole piece 100a to be cut by the first cutter 210 and the second cutter 220 along the second direction is consistent.

[0118] According to the processing method of the pole piece 100 of the embodiment of the present application, the cutting knife assembly 200 is controlled to cut the pole piece 100a to be cut at the pole piece cutting station 310, and during the cutting process, the cutting amounts of the first cutting knife 210 and the second cutting knife 220 in the second direction are controlled to be consistent, so that the shaping effect of the insulating coating 20 shaped on the first side surface c can be better, the cross-sectional shielding effect of the current collector 10 can be better, and the insulation protection effect can be better.

[0119] like Figure 3 and Figure 7As shown, an embodiment of the present application discloses a battery cell 400, including: an electrode assembly 410 and a shell 420, the electrode assembly 410 is arranged in the shell 420, the electrode assembly 410 includes: a first pole piece 100 and a second pole piece 100, at least one of the first pole piece 100 and the second pole piece 100 is constructed as the pole piece 100 in the above embodiment.

[0120] According to the battery cell 400 of the embodiment of the present application, the first pole piece 100 can be a positive pole piece, and the corresponding second pole piece 100 can be a negative pole piece, and at least one of the positive pole piece and the negative pole piece is constructed as the pole piece 100 in the above embodiment, which can reduce the probability of short circuit in the internal electrode assembly 410 of the battery cell 400, so as to improve the reliability of the battery cell 400.

[0121] like Figure 2 As shown, the embodiment of the present application discloses a battery device 500, including: the battery cell 400 in the above embodiment.

[0122] like Figure 1 As shown, an embodiment of the present application discloses an electric device 600, including: the battery device 500 in the above embodiment.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0124] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole piece, characterized in that: include: A current collector (10), the current collector (10) comprising a main body (11) and a pole ear (12) located at one end of the main body (11) in a first direction, the main body (11) having a first surface (a), a second surface (b) arranged opposite to each other in a second direction, and a first side surface (c) connected to the same side of the first surface (a) and the second surface (b) and adjacent to the pole ear (12); An insulating coating (20), the insulating coating (20) being coated on at least a portion of the first surface (a), at least a portion of the second surface (b), and the first side surface (c), the first direction being orthogonal to the second direction.

2. The pole piece according to claim 1, characterized in that: The main body (11) comprises: an active area (111) and an insulating area (112) arranged in sequence in the first direction, and the insulating coating (20) is applied to the insulating area (112).

3. The pole piece according to claim 2, characterized in that: A side surface of the insulating region (112) adjacent to the pole ear (12) is formed as the first side surface (c).

4. The pole piece according to any one of claims 1 to 3, characterized in that: The insulating coating (20) is applied to a portion of the first surface (a) defining an insulating region (112), a portion of the second surface (b) defining an insulating region (112), and the first side surface (c).

5. The pole piece according to claim 4, characterized in that: The thickness D1 of the insulating coating (20) on the first surface (a) and the second surface (b) and the thickness D2 of the current collector (10) satisfy the following relationship: 4≤D1 / D2≤10.

6. A cutter assembly, characterized in that: The cutter assembly is suitable for cutting a pole piece (100a) to be cut to obtain a pole piece according to any one of claims 1 to 5, and the cutter assembly comprises: a first cutter (210) and a second cutter (220), wherein the first cutter (210) and the second cutter (220) are located on both sides of the current collector (10) in the second direction, and are suitable for cutting off the current collector (10) and guiding the insulating coating (20) to be shaped toward the first side surface (c).

7. The cutter assembly according to claim 6, characterized in that The first cutter (210) has a first cutting portion (211), and the second cutter (220) has a second cutting portion (221), and the first cutting portion (211) and the second cutting portion (221) are suitable for cutting the electrode to be cut along the second direction.

8. The cutter assembly according to claim 7, characterized in that The first cutter (210) and the second cutter (220) have a shaping portion, the shaping portion is located on one side of the first cutting portion (211) in the second direction, or is located on one side of the second cutting portion (221) in the second direction, and the shaping portion is used to shape the pole piece.

9. The cutter assembly according to claim 8, characterized in that The shaping portion is configured as a shaping surface, and an angle formed between the shaping surface and the second direction is 30° to 60°.

10. The cutter assembly according to claim 8 or 9, characterized in that The shaping portion of the first cutting knife (210) and the shaping portion of the second cutting knife (220) are symmetrically arranged along the second direction.

11. A pole piece production line, characterized in that: include: The cutter assembly according to any one of claims 6 to 10, wherein the cutter assembly is arranged at a pole piece cutting station (310).

12. A method for processing a pole piece, the method being applicable to the pole piece production line according to claim 11, characterized in that: include: Moving the electrode piece (100a) to be cut to the electrode piece cutting station (310); Controlling the cutter assembly according to any one of claims 6 to 10 to cut the pole piece (100a) to be cut and shaping the insulating coating (20) on the first side (c); in The first cutter (210) and the second cutter (220) cut the to-be-cut pole piece (100a) in half along the second direction, and the first cutter (210) and the second cutter (220) have the same cutting amount of the to-be-cut pole piece (100a) along the second direction.

13. A battery cell, characterized in that: include: An electrode assembly (410) and a shell (420), wherein the electrode assembly (410) is arranged in the shell (420), and the electrode assembly (410) comprises: a first pole piece and a second pole piece, and at least one of the first pole piece and the second pole piece is constructed as the pole piece according to any one of claims 1 to 5.

14. A battery device, characterized in that: include: The battery cell according to claim 13.

15. An electrical equipment, characterized in that: include: The battery device of claim 14.

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