Cutting tool assembly, production line, method, pole piece, battery cell, device and electrical equipment

Abstract

This application relates to the field of battery technology. This application discloses a cutting tool assembly, a production line, a method, a pole piece, a battery cell, a device, and an electrical equipment, including: a current collector and an insulating coating. The current collector includes a main body portion and a tab located at one end of the main body portion in the first direction. The main body portion has a first surface and a second surface that are opposite to each other in the second direction, and a first side surface that is connected to the same side of the first surface and the second surface and is adjacent to the tab. The insulating coating is coated on at least part of the first surface, at least part of the second surface, and the first side surface. The first direction is orthogonal to the second direction. According to the pole piece of the embodiment of this application, by providing an insulating coating on the first side surface, the first surface, and the second surface of the main body portion, the probability of short circuit in the large surface area and the side surface area of adjacent pole pieces can be reduced, thereby improving the reliability of the pole piece and reducing potential safety hazards.

Description

Technical Field

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

[0002] In the related art, the current collector of the pole piece is cut to form a tab, and the positive pole piece and the negative pole piece are wound together. 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 at least solve one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a pole piece, which has good insulation effect and can reduce potential safety hazards.

[0004] The present application further provides a cutting tool assembly for cutting the above-mentioned pole piece.

[0005] The present application also provides a pole piece production line using the above-mentioned cutting tool assembly.

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

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

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

[0009] The present application further provides an electrical equipment having the above-mentioned battery device.

[0010] In a first aspect, the present application provides a pole piece, including: a current collector and an insulating coating. The current collector includes a main body portion and a tab located at one end of the main body portion in a first direction. The main body portion has a first surface and a second surface disposed 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 tab. The insulating coating is coated on at least a part of the first surface, at least a part of the second surface, and the first side surface. 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 portion, the probability of short circuit in the large surface area and the side surface area of adjacent pole pieces can be reduced, thereby improving the reliability of the pole piece and reducing potential safety hazards.

[0012] According to some embodiments of the present application, the main body portion includes: an active region and an insulating region disposed in sequence in the first direction. The insulating coating is coated on the insulating region.

[0013] In the above technical solution, the main body includes an active region (i.e., the other part of the main body) and an insulating region (i.e., at least part of the main body). When the tab is not cut out from the tab portion, both the tab portion and the insulating region are coated with an insulating coating. After cutting, the tab is exposed and used for the electrical energy output of the electrode plate, while the insulating region is still coated with the insulating coating to achieve the insulation protection of the first surface and the second surface of the main body, the regions not facing the separator, reduce the probability of short circuit between the large surfaces of adjacent electrode plates, and improve the safety of the electrode plate.

[0014] It should be noted that by setting the insulating region, when the width dimension of the separator between adjacent electrode plates is smaller than the main body, insulation between the large surfaces of the electrode plates can be achieved through the insulating region, which can improve the insulation stability and reliability, and reduce the probability of short circuit caused by the separator overhang phenomenon in the battery cell, thereby improving the reliability.

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

[0016] In the above technical solution, an insulating coating is provided on the surface of the main body adjacent to the tab (i.e., the cut surface, the first side surface). The setting position of the insulating coating is more reasonable, which can improve the insulation protection effect between adjacent electrode plates, between the main body of one electrode plate and the tab of another electrode plate, and improve the reliability of the battery cell.

[0017] According to some embodiments of the present application, the insulating coating is coated on the part of the first surface that defines the insulating region, the part of the second surface that defines the insulating region, and the first side surface.

[0018] In the above technical solution, the insulating coating can be divided into three parts. The three parts can be respectively coated on three surfaces, or can be coated on the first surface and the second surface, and during the process of cutting the tab, the insulating coating on the first side surface can be formed 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, the thickness D1 of the insulating coating on the first surface and the second surface and the thickness D2 of the current collector satisfy: 4 ≤ D1 / D2 ≤ 10.

[0020] In the above technical solution, not only can the excessive thickness of the insulating coating be avoided to make the thickness dimension of the electrode plate more reasonable and take into account the energy density of the battery cell, but also the too small thickness of the insulating coating can be avoided. In the embodiment of cutting the tab and simultaneously shaping the insulating coating on the first side surface, a more reasonable amount of cutting residue can participate in the cutting and shaping to improve the forming quality of the insulating coating on the first and side surfaces, and make the insulation protection effect of the insulating coating more stable and reliable.

[0021] In a second aspect, the present application provides a cutting tool assembly, which is suitable for cutting a to-be-cut pole piece to obtain the pole piece in the above embodiments. The cutting tool assembly includes: a first cutting tool and a second cutting tool. The first cutting tool and the second cutting tool are located on both sides of the current collector in the second direction, and are suitable for cutting the current collector and guiding the insulating coating to be shaped towards the first side.

[0022] According to the cutting tool assembly of the embodiments of the present application, by providing the first cutting tool and the second cutting tool, the first cutting tool and the second cutting tool can act on the to-be-cut pole piece synchronously to realize the cutting of the tab. During the cutting process, the first cutting tool and the second cutting tool can cut the first coating and the second coating respectively along the first direction during the cutting process and perform guiding and shaping. During the processing of the pole piece, directly on the first coating and the second coating, the shaping of the third coating can be realized, which can reduce the processing difficulty, save processing steps, and improve the processing efficiency.

[0023] According to some embodiments of the present application, the first cutting tool has a first cutting part, and the second cutting tool has a second cutting part. The first cutting part and the second cutting part are suitable for cutting the to-be-cut pole piece in the second direction.

[0024] In the above technical solution, the first cutting part and the second cutting part cut the to-be-cut pole piece in the second direction, so that while respectively crushing the first coating and the second coating, the cross section of the current collector can be made more neat. During the cutting process, cutting and shaping can be realized, and during the cutting process, the crushed material can be prevented from falling off, so as to improve the coating effect of the third coating on the first side, and further improve the insulation effect.

[0025] According to some embodiments of the present application, the first cutting tool and the second cutting tool have shaping parts. The shaping parts are located on one side of the first cutting part in the second direction, or on one side of the second cutting part in the second direction, and the shaping parts are used for shaping 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 during the cutting process can be accumulated in front of the cross section of the main body part in the first direction under the guiding action of the first shaping part and / or the second shaping part, that is, the shaping of the insulating coating can be realized through at least one shaping part, so as to improve the insulation effect of the insulating coating, and further improve the reliability of the pole piece.

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

[0028] In the above technical solution, on the one hand, the included 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 during the cutting process is more reasonable, thereby improving the covering effect on the first side and further enhancing the insulation effect. On the other hand, the included angle between the shaping surface and the second direction is not greater than 60°, which can reduce the probability of the pole piece deforming during the cutting process and improve the cutting quality.

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

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

[0031] Thirdly, an embodiment of the present application discloses a pole piece production line, including: the cutting knife assembly in the above embodiment, and the cutting knife assembly is arranged at the pole piece cutting station.

[0032] According to the pole piece production line of the embodiment of the present application, the above cutting knife assembly is adopted, and the cutting of the pole piece can be realized at the pole piece cutting station. While cutting out the pole ear, the shaping of the insulating coating can be realized, 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 portion, thereby improving the insulation effect and reliability of the pole piece.

[0033] Fourthly, an embodiment of the present application discloses a processing method for a pole piece, and the processing method includes:

[0034] Moving the pole piece to be cut to the pole piece cutting station;

[0035] Controlling the cutting knife assembly to cut the pole piece to be cut; wherein the first cutting knife and the second cutting knife cut the pole piece to be cut along the second direction, and the cutting amounts of the first cutting knife and the second cutting knife along the second direction for cutting the pole piece to be cut are the same.

[0036] According to the processing method for a pole piece of the embodiment of the present application, by controlling the cutting knife assembly to cut the pole piece to be cut at the pole piece cutting station, and during the cutting process, controlling the cutting amounts of the first cutting knife and the second cutting knife in the second direction to be the same, the shaping effect of the insulating coating shaped on the first side can be better, the shielding effect on the cross section of the current collector can be better, and the insulation protection effect can be better.

[0037] Fifth aspect, an embodiment of the present application discloses a battery cell, including: an electrode assembly and a housing, the electrode assembly is disposed inside the housing, and the electrode assembly includes: a first electrode tab and a second electrode tab, and at least one of the first electrode tab and the second electrode tab is configured as the electrode tab in the above embodiment.

[0038] For the battery cell according to the embodiment of the present application, the first electrode tab may be a positive electrode tab, and correspondingly, the second electrode tab may be a negative electrode tab, and at least one of the positive electrode tab and the negative electrode tab is configured as the electrode tab in the above embodiment, which can reduce the probability of short circuit in the electrode assembly inside the battery cell, so as to improve the reliability of the battery cell.

[0039] Sixth aspect, an embodiment of the present application discloses a battery device, including: the battery cell in the above embodiment.

[0040] Seventh aspect, an embodiment of the present application discloses an electrical device, including: the battery device in the above embodiment.

[0041] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0042] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0043] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0044] Figure 2 is a schematic diagram of a battery device according to an embodiment of the present application;

[0045] Figure 3 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0046] Figure 4 is a schematic diagram of a cutting tool assembly and an electrode tab (before cutting) according to an embodiment of the present application;

[0047] Figure 5 is a schematic diagram of a cutting tool assembly and an electrode tab (after cutting) according to an embodiment of the present application;

[0048] Figure 6 is a cross-sectional schematic diagram of a cutting tool assembly and an electrode tab according to an embodiment of the present application;

[0049] Figure 7 is a schematic diagram of an electrode tab from an angle according to an embodiment of the present application;

[0050] Figure 8It is a schematic diagram of another angle of the pole piece according to an embodiment of the present application;

[0051] Figure 9 It is a sectional view schematic diagram of the pole piece according to an embodiment of the present application;

[0052] Figure 10 It is a front view schematic diagram of the pole piece according to an embodiment of the present application;

[0053] Figure 11 It is a schematic diagram of the pole piece production line according to an embodiment of the present application;

[0054] Figure 12 It is a flowchart of the processing method according to an embodiment of the present application.

[0055] Reference numerals:

[0056] Pole piece 100, pole piece to be cut 100a,

[0057] Current collector 10, main body portion 11, active region 111, insulating region 112, tab 12,

[0058] Insulating coating 20, first coating 21, second coating 22, third coating 23,

[0059] First surface a, second surface b, first side surface c,

[0060] Cutting tool assembly 200, first cutting tool 210, first cutting portion 211, first shaping portion 212, second cutting tool 220, second cutting portion 221, second shaping portion 222,

[0061] Pole piece production line 300, pole piece cutting station 310,

[0062] Battery cell 400, electrode assembly 410, housing 420,

[0063] Battery device 500, electrical equipment 600, motor 700, controller 800,

[0064] First direction X, second direction Y. Detailed implementation manners

[0065] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application shall have the same meanings as commonly understood by those of ordinary skill in the technical field to which this application pertains. The terms used in the description of the application in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the description of the specification, claims, and the above drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description of the specification, claims, or the above drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0067] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "joined", and "attached" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0069] The term "and / or" in this application 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 three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0070] In the embodiments of this application, the same reference numerals represent the same components. For the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thicknesses, lengths, widths, etc. of various components shown in the drawings of the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0071] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by 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 present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0072] In the description of the present invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0073] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0074] As used in this application, "a plurality of" means two or more (including two).

[0075] The battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to continue to be used.

[0076] The battery cell may 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application do not limit this.

[0077] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells may form a battery row, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a current collecting component.

[0078] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells, such as forming a battery row.

[0079] As an example, the battery cell assembly may be a battery module, and the battery module 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 with cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0081] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0082] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0083] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covering or closing, which may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0084] 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.

[0085] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the cross beam and longitudinal beam of the vehicle.

[0086] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical equipment using battery devices.

[0087] The electrical equipment may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric plane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, and a planer, etc. The embodiments of the present application do not impose special restrictions on the above electrical equipment.

[0088] For the convenience of description, the following embodiments take the electrical equipment as a vehicle as an example for description.

[0089] Please refer to Figure 1, The figure is a schematic diagram of an electrical device 600 provided by some embodiments of the present application. A battery device 500 is provided inside the vehicle. The battery device 500 can be arranged at the bottom, head or tail of the vehicle. The battery device 500 can be used for power supply of the vehicle. For example, the battery device 500 can be used as the operating power source of the vehicle.

[0090] 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 is formed as a load. For example, it is used for the working power requirements during vehicle startup, navigation and driving.

[0091] In some embodiments of the present application, the battery device 500 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0092] Please refer to Figure 2 , Figure 2 , The figure is a schematic diagram of the battery device 500 provided by some embodiments of the present application. The battery device 500 includes a box body, and the box body is used to accommodate battery cells 400.

[0093] Among them, the box body is a component for accommodating the battery cells 400. The box body provides a placement space for multiple battery cells 400, and the box body can adopt various structures. In some embodiments, the box body may include a tray and a cover plate. The tray and the cover plate are covered with each other to define a placement space for accommodating the battery cells 400. The tray and the cover plate can be of 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. The open side of the cover plate is covered on the open side of the tray, then a box body with a placement space is formed. It can also be that the tray is a hollow structure with one side open and the cover plate is a plate-like structure, and the cover plate is covered on the open side of the tray, then a box body with a placement space is formed. As an example, the battery cells 400 can be cylindrical battery cells, prismatic battery cells or battery cells of other shapes (such as: soft-pack battery cells), and there is no special limitation in the present application.

[0094] In the battery device 500, the battery cells 400 can be one or multiple. If there are multiple battery cells 400, the multiple battery cells 400 can be connected in series, in parallel or in a mixed connection. A mixed connection means that there are both series and parallel connections among multiple battery cells 400. It can be that multiple battery cells 400 are first connected in series, in parallel or in a mixed connection to form a battery module, and then multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole and are accommodated in the box body. It can also be that all the battery cells 400 are directly connected in series, in parallel or in a mixed connection together, and then the whole formed by all the battery cells 400 is accommodated in the box body.

[0095] Such as Figure 2and 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 within the housing 420.

[0096] In some embodiments, the battery cell 400 may include: a housing 420 and an electrode assembly 410. The housing 420 is used to define an accommodation space with an installation opening. The housing 420 can be a bag-like structure of a soft-pack battery wrapped outside the electrode assembly 410, or can be configured as a hard shell structure, and the electrode assembly 410 is disposed therein.

[0097] Exemplarily, the housing 420 may include a bottom plate and side plates. The side plates surround the periphery of the bottom plate and define an accommodation space with an installation opening. The electrode assembly 410 and other functional components can be disposed within the accommodation space. The end cap covers the installation opening of the housing 420 to isolate the internal environment of the battery cell 400 from the external environment. The shape of the end cap is adapted to the shape of the housing 420. The end cap can be supported by a material with a certain hardness and strength (such as aluminum alloy, carbon fiber board). The end cap can effectively protect the safety and reliability of the internal components of the housing 420 during extrusion and collision.

[0098] In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 400 reaches a threshold may also be provided on the end cap or the housing 420. The material of the end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap. The insulating member can be used to isolate the electrical connection components within the housing 420 from the end cap to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc., and an insulating sheet can also be provided between the electrode assembly 410 and the housing 420 to achieve insulation protection.

[0099] The housing 420 is a component for cooperating with the end cap to form the internal environment of the battery cell 400. Among them, the formed internal environment can be used to accommodate the electrode assembly 410, electrolyte, and other components. The housing 420 and the end cap can be independent components. An installation opening can be provided on the housing 420, and the end cap covers the opening at the installation opening to form the internal environment of the battery cell 400. The housing 420 can be of various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 420 can be determined according to the specific shape and size of the electrode assembly 410. The material of the housing 420 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0100] Electrode terminals can be further provided on the end cap or the housing 420. The electrode assembly 410 is a component in the battery cell 400 where an electrochemical reaction occurs. One or more electrode assemblies 410 can be included within the housing 420. The electrode assembly 410 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body portion 11 of the electrode assembly 410, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 12. The positive electrode tab 12 and the negative electrode tab 12 can be located together at one end of the main body portion 11 or respectively at both ends of the main body portion 11. 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 electrode tabs 12 are connected to the electrode terminals to form a current loop.

[0101] As Figure 11 shown, the electrode plate 100 can be processed by the electrode plate production line 300, and the electrode plate production line 300 can have multiple workstations, such as workstation 1 to workstation N, and at least one of the multiple workstations can be formed as the electrode plate cutting workstation 310. Combining Figure 10 shown, the current collector 10 (foil material) of the electrode plate 100 is sequentially provided with the main body portion 11 and the electrode tab portion. The electrode tab portion can be cut by the electrode plate cutting workstation 310 to obtain the electrode tab 12. A separator is provided between adjacent electrode plates 100, and the size of the separator is limited, and there may also be errors during the processing, resulting in a certain probability that the separator between adjacent electrode plates 100 is difficult to effectively cover the active area 111 (the overhang phenomenon occurs), or even a short circuit phenomenon occurs. Based on this, in the prior art, an insulating area 112 needs to be further provided between the electrode tab 12 and the active area 111 (the area coated with the active material) of the main body portion 11, and an insulating coating 20 is coated in the insulating area 112 to achieve insulation protection between adjacent electrode plates 100.

[0102] However, although coating the insulating coating 20 in the insulating area 112 can reduce the probability of short circuit between adjacent electrode plates 100, during the process of cutting the electrode tab 12 on the current collector 10, the current collector 10 on the side end face (i.e., the cutting surface) of the insulating area 112 adjacent to the electrode tab 12 will be exposed, and there is still a probability of short circuit between the electrode tab 12 of one electrode plate 100 and the current collector 10 of another electrode plate 100 between adjacent electrode plates 100.

[0103] Based on this, the present application proposes an electrode plate 100. By providing the insulating coating 20 on the first side c of the main body portion 11 facing the electrode tab 12, and also providing the insulating coating 20 on the first surface a and the second surface b, the insulation protection effect of the electrode plate 100 can be improved, the probability of short circuit between adjacent electrode plates 100 can be further reduced, the potential safety hazard can be reduced, and the reliability can be improved.

[0104] As Figure 12 shown, the processing method of the electrode sheet 100 according to the embodiment of the present application can cut the electrode sheet 100a to be cut through the above-mentioned electrode sheet production line 300, and obtain the electrode sheet 100 that meets the insulation protection requirements.

[0105] Next, refer to Figures 1 - 12 to describe the electrode sheet 100, the cutting tool assembly 200, the electrode sheet production line 300, the processing method, the battery cell 400, the battery device 500, and the electrical equipment 600 according to the embodiments of the present invention.

[0106] As Figure 7 , Figure 8 , Figure 9 and Figure 10 shown, the present application proposes an electrode sheet 100, including: a current collector 10 and an insulating coating 20. The current collector 10 includes a main body portion 11 and a tab 12 located at one end of the main body portion 11 in the first direction. The main body portion 11 has a first surface a and a second surface b disposed opposite to each other in the 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 tab 12. The insulating coating 20 is coated on at least a part of the first surface a, at least a part of the second surface b, and the first side surface c. The first direction is orthogonal to the second direction.

[0107] Wherein, the first direction may be the width direction of the electrode sheet 100, the second direction may be the thickness direction of the electrode sheet 100, and a plurality of electrode sheets 100 are stacked or wound in the thickness direction to form an electrode assembly 410. Adjacent electrode sheets 100 are respectively a positive electrode sheet and a negative electrode sheet. A separator is disposed between the main body portions 11 of the positive electrode sheet and the negative electrode sheet, and an insulating coating 20 is disposed at the width ends of adjacent electrode sheets 100 (that is, the insulating coating 20 is coated on at least a part of the first surface a and at least a part of the second surface b) to improve the insulation effect between adjacent electrode sheets 100.

[0108] It can be understood that, as Figure 4 , Figure 5 , Figure 8 and Figure 10As shown, the current collector 10 can be a metal foil, which is divided into a main body portion 11 and a tab 12. The tab 100a to be cut is the state of the tab 100 before the tab 12 is cut. Before the tab 12 is cut, the current collector 10 is generally in the shape of a rectangular strip and includes a main body portion 11 and a tab portion arranged in sequence in the first direction. At least part of the whole tab portion and the main body portion 11 can be coated with an insulating coating 20, while the other part of the main body portion 11 is coated with an active material. Then, the tab portion is cut to obtain the tab 12. After the cutting is completed, on the part of the main body portion 11 coated with the insulating coating 20, a cut surface (i.e., the first side c) is formed adjacent to the tab 12. The current collector 10 is exposed on the cut surface. The width ends (i.e., the ends in the first direction) of adjacent tabs 100 respectively lead out a positive tab 12 and a negative tab 12, which causes the positive tab 12 to easily short-circuit with the exposed part of the current collector 10 of the negative tab on the first side c, and the negative tab 12 to easily short-circuit with the exposed part of the positive tab on the first side c, posing a safety hazard.

[0109] Based on this, in combination with Figure 7 、 Figure 8 、 Figure 9 and Figure 10 As shown, in the present application, the insulating coating 20 is provided in at least part of the area of the first surface a of the main body portion 11 adjacent to the tab 12 and at least part of the area of the second surface b adjacent to the tab 12, which can avoid short-circuiting between the large surface areas (i.e., the area with the largest tab 12 area defined by the first surface a and the second surface b) of adjacent tabs 100. Further, by providing the insulating coating 20 on the first side c of the main body portion 11, it can be realized that after the tab 12 is cut, the insulating coating 20 is provided on the formed cut surface, and insulating protection can be realized on the side area of adjacent tabs 100, reducing the probability of short-circuiting between the tab 12 of one tab 100 and the main body portion 11 of another tab 100 among adjacent tabs 100.

[0110] For the tab 100 according to the embodiment of the present application, by providing the insulating coating 20 on the first side c, the first surface a, and the second surface b of the main body portion 11, the probability of short-circuiting in the large surface area and the side area of adjacent tabs 100 can be reduced, thereby improving the reliability of the tab 100 and reducing the safety hazard.

[0111] As Figure 8 and Figure 10 shown, according to some embodiments of the present application, the main body portion 11 includes: an active area 111 and an insulating area 112 arranged in sequence in the first direction, and the insulating coating 20 is coated on the insulating area 112.

[0112] That is to say, the main body portion 11 includes an active region 111 (i.e., the other part of the main body portion 11 described above) and an insulating region 112 (i.e., at least part of the main body portion 11 described above). When the tab 12 is not cut out from the tab portion, both the tab portion and the insulating region 112 are coated with an insulating coating 20. After cutting, the tab 12 is exposed and used for the electrical energy output of the electrode sheet 100, while the insulating region 112 is still coated with the insulating coating 20 to achieve insulation protection for the regions of the first surface a and the second surface b of the main body portion 11 that are not opposite to the separator, reduce the probability of short circuit between the large surfaces of adjacent electrode sheets 100, and improve the safety of the electrode sheet 100.

[0113] It should be noted that by providing the insulating region 112, when the width dimension of the separator between adjacent electrode sheets 100 is smaller than that of the main body portion 11, insulation between the large surfaces of the electrode sheets 100 can be achieved through the insulating region 112, which can improve insulation stability and reliability, reduce the probability of short circuit caused by the separator overhang phenomenon in the battery cell 400, and improve reliability.

[0114] Combined Figure 7 、 Figure 9 and Figure 10 As shown in, according to some embodiments of the present application, one side surface of the insulating region 112 adjacent to the tab 12 is formed as a first side surface c.

[0115] Specifically, the two surfaces in the thickness direction (i.e., the second direction) of the main body portion 11 are respectively a first surface a and a second surface b. The surface of the main body portion 11 adjacent to the tab 12 in the width direction is a first side surface c, and the insulating coating 20 is provided on the first side surface c.

[0116] In this way, by providing the insulating coating 20 on the surface of the main body portion 11 adjacent to the tab 12 (i.e., the above-mentioned cut 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 electrode sheets 100, between the main body portion 11 of one electrode sheet 100 and the tab 12 of another electrode sheet 100, and improve the reliability of the battery cell 400.

[0117] Such as Figure 8 、 Figure 9 and Figure 10 As shown in, according to some embodiments of the present application, the insulating coating 20 is coated on the part of the first surface a that defines the insulating region 112, the part of the second surface b that defines the insulating region 112, and the first side surface c.

[0118] Exemplarily, the insulating coating 20 may include: a first coating 21, a second coating 22, and a third coating 23. 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.

[0119] Specifically, the first coating 21 and the second coating 22 can be pre-coated on the insulating region 112, while the third coating 23 can be formed during the shaping process of cutting the electrode tab 100, or after the electrode tab 100 is completely cut, an additional process or station can be added to coat the insulating coating 20 on the first side c.

[0120] Thus, the insulating coating 20 can be divided into three parts. The three parts can be respectively coated on three surfaces, or can be coated on the first surface a and the second surface b, and during the process of cutting the electrode ear 12, the third coating 23 on the first side c can be set by shaping, which can reduce the processing difficulty, improve the processing efficiency, and reduce the processing cost.

[0121] According to some embodiments of the present application, 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: 4 ≤ D1 / D2 ≤ 10.

[0122] 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 4 times, 5 times, 6 times, 7 times, 8 times, 9 times, or 10 times the thickness of the current collector 10.

[0123] In this way, not only can the excessive thickness of the insulating coating 20 be avoided, making the thickness dimension of the electrode tab 100 more reasonable to balance the energy density of the battery cell 400, but also the too small thickness of the insulating coating 20 can be avoided. In the embodiment where the electrode ear 12 is cut and the insulating coating 20 on the first side c is shaped synchronously, a more reasonable amount of cutting residue can participate in the cutting and shaping to improve the forming quality of the insulating coating 20 on the first and side c, making the insulating protection effect of the insulating coating 20 more stable and reliable.

[0124] As Figure 4 、 Figure 5 and Figure 6 shown, the present application proposes a cutter assembly 200. The cutter assembly 200 is adapted to cut the to-be-cut electrode tab 100a to obtain the electrode tab 100 in the above embodiments. 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 adapted to cut off the current collector 10 and guide the insulating coating 20 to be shaped towards the first side c.

[0125] Specifically, the first cutting blade 210 and the second cutting blade 220 can cut the to-be-cut pole piece 100a in the second direction. During the process of the first cutting blade 210 and the second cutting blade 220 cutting the to-be-cut pole piece 100a, they can cut off the current collector 10. During the process of cutting off 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 towards the first side c under the guidance of the first cutting blade 210 and the second cutting blade 220, so as to form an insulating coating 20 (such as: the third coating 23) on the first side c.

[0126] It should be noted that during the process of the cutter assembly 200 cutting the to-be-cut pole piece 100a, in terms of the microscopic mechanism, the first cutting blade 210 and the second cutting blade 220 can respectively press against the first coating 21 and the second coating 22. While crushing the first coating 21 and the second coating 22 to cause them to deform, under the action of the cutting pressure, the main body portion 11 (the texture of the foil is thin and easily brittle) can be broken and a cross-section is formed. During the continuous movement of the first cutting blade 210 and the second cutting blade 220, under the action of pressure, the crushed materials on the crushed first coating 21 and the crushed materials on the second coating 22 can be guided to the front side of the cross-section, and the cross-section can be blocked, that is, guided to the first side c and piled up on one side of the cross-section of the main body portion 11, so as to achieve insulation protection on the first side c.

[0127] According to the cutter assembly 200 of the embodiment of the present application, by setting the first cutting blade 210 and the second cutting blade 220, the first cutting blade 210 and the second cutting blade 220 can act on the to-be-cut pole piece 100a synchronously to cut the tab 12. During the cutting process, the first cutting blade 210 and the second cutting blade 220 can cut the first coating 21 and the second coating 22 respectively along the first direction during the cutting process and perform guiding and shaping. During the processing of the pole piece 100, the shaping of the third coating 23 can be directly realized through the first coating 21 and the second coating 22, which can reduce the processing difficulty, save processing steps, and improve the processing efficiency.

[0128] Combined with Figure 4 、 Figure 5 and Figure 6 As shown in, according to some embodiments of the present application, the first cutting blade 210 has a first cutting portion 211, the second cutting blade 220 has a second cutting portion 221, and the first cutting portion 211 and the second cutting portion 221 are adapted to cut the to-be-cut pole piece 100a in a butt-joint manner along the second direction.

[0129] Thus, the first cutting part 211 and the second cutting part 221 cut the to-be-cut pole piece 100a in the second direction, so as to make the cross-section of the current collector 10 neater while crushing the first coating 21 and the second coating 22 respectively. During the cutting process, the to-be-cut pole piece 100a can be shaped by the opposite cutting, avoiding the falling-off of the crushed material during the cutting process, improving the coating effect of the third coating 23 on the first side c, and further improving the insulation effect.

[0130] According to some embodiments of the present application, the first cutter 210 and the second cutter 220 have shaping parts, which are located on one side of the first cutting part 211 in the second direction or on one side of the second cutting part 221 in the second direction, and the shaping parts are used to shape the pole piece 100.

[0131] Exemplarily, the shaping part may include a first shaping part 212 formed on the first cutter 210 and a second shaping part 222 formed on the second cutter 220. The first shaping part 212 is located on one side of the first cutter 210 in the second direction, and the second shaping part 222 is located on one side of the second cutter 220 in the second direction.

[0132] Thus, during the cutting process of the first cutting part 211 and the second cutting part 221, the crushed material during the cutting process can be guided by the first shaping part 212 and the second shaping part 222 and accumulate in front of the cross-section of the main body part 11 in the first direction. That is, the shaping of the insulating coating 20 can be realized through at least one shaping part, so as to improve the insulation effect of the insulating coating 20 and further improve the reliability of the pole piece 100.

[0133] According to some embodiments of the present application, the shaping part is configured as a shaping surface, and the included angle between the shaping surface and the second direction is 30°-60°.

[0134] Exemplarily, the shaping surface is a plane, and the included angle between the shaping surface and the second direction can be 30°, 45°, 60°, etc.

[0135] Thus, on the one hand, making the included angle between the shaping surface and the second direction not less than 30° makes the amount of insulating material used for shaping the third coating 23 during the cutting process more reasonable, so as to improve the covering effect on the first side c and thus improve the insulation effect. On the other hand, making the included angle between the shaping surface and the second direction not greater than 60° can reduce the probability of deformation of the pole piece 100 during the cutting process and improve the cutting quality.

[0136] As Figure 4 and Figure 5 shown, according to some embodiments of the present application, the shaping part of the first cutter 210 and the shaping part of the second cutter 220 are symmetrically arranged along the second direction.

[0137] That is to say, a first shaping portion 212 is provided on the first cutting knife 210, and a second shaping portion 222 is provided on the second cutting knife 220. 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, both the first coating 21 and the second coating 22 can be shaped to the first side surface c, making the covering effect of the third coating 23 on the main body portion 11 better, thereby further improving the insulation effect.

[0138] As Figure 5 and Figure 11 shown, an embodiment of the present application discloses a pole piece production line 300, including: the cutting knife assembly 200 in the above embodiment, and the cutting knife assembly 200 is arranged at the pole piece cutting station 310.

[0139] According to the pole piece production line 300 of the embodiment of the present application, the above cutting knife assembly 200 is adopted, and at the pole piece cutting station 310, the cutting of the pole piece 100 can be realized. While cutting out the pole ear 12, the shaping of the insulating coating 20 can be realized, and during the shaping process, the third coating 23 is shaped, so as to realize the processing of the insulating coating 20 on the first side surface c, the first surface a and the second surface b of the main body portion 11, thereby improving the insulation effect and reliability of the pole piece 100.

[0140] As Figure 12 shown, an embodiment of the present application also discloses a processing method for a pole piece 100. The processing method is applicable to the above pole piece production line 300, and the processing method includes:

[0141] Moving the pole piece 100a to be cut to the pole piece cutting station 310;

[0142] Controlling the cutting knife assembly 200 to cut the pole piece 100a to be cut and shaping the insulating coating 20 on the first side surface c; wherein the first cutting knife 210 and the second cutting knife 220 cut the pole piece 100a to be cut along the second direction, and the cutting amounts of the first cutting knife 210 and the second cutting knife 220 along the second direction for cutting the pole piece 100a to be cut are the same.

[0143] According to the processing method for the pole piece 100 of the embodiment of the present application, by controlling the cutting knife assembly 200 at the pole piece cutting station 310 to cut the pole piece 100a to be cut, and during the cutting process, controlling the cutting amounts of the first cutting knife 210 and the second cutting knife 220 in the second direction to be the same, the shaping effect of the insulating coating 20 shaped on the first side surface c can be better, the shielding effect on the cross section of the current collector 10 can be better, and the insulation protection effect can be better.

[0144] As Figure 3 and Figure 7As shown, an embodiment of the present application discloses a battery cell 400, including: an electrode assembly 410 and a housing 420. The electrode assembly 410 is disposed within the housing 420. The electrode assembly 410 includes: a first electrode tab 100 and a second electrode tab 100, and at least one of the first electrode tab 100 and the second electrode tab 100 is configured as the electrode tab 100 in the above embodiment.

[0145] For the battery cell 400 according to the embodiment of the present application, the first electrode tab 100 may be a positive electrode tab, and correspondingly, the second electrode tab 100 may be a negative electrode tab. And at least one of the positive electrode tab and the negative electrode tab is configured as the electrode tab 100 in the above embodiment, which can reduce the probability of short circuit occurring in the electrode assembly 410 inside the battery cell 400, so as to improve the reliability of the battery cell 400.

[0146] As Figure 2 shown, an embodiment of the present application discloses a battery device 500, including: the battery cell 400 in the above embodiment.

[0147] As Figure 1 shown, an embodiment of the present application discloses an electrical device 600, including: the battery device 500 in the above embodiment.

[0148] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do 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.

[0149] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cutter assembly, characterized in that: The cutter assembly is suitable for cutting a to-be-cut pole piece (100a) to obtain a pole piece, wherein the pole piece comprises: 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) and at least a portion of the second surface (b), and being cut and shaped to the first side surface (c), wherein the first direction is orthogonal to the second direction; The cutter assembly comprises: 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 the current collector (10) and guiding the insulating coating (20) to be shaped toward the first side surface (c).

2. The cutter assembly 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 cutter assembly 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 cutter assembly 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 area (112), a portion of the second surface (b) defining an insulating area (112), and is cut and shaped to the first side surface (c).

5. The cutter assembly 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. The cutter assembly according to claim 1, 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.

7. The cutter assembly according to claim 6, 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.

8. The cutter assembly according to claim 7, 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°.

9. The cutter assembly according to claim 7 or 8, 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.

10. A pole piece production line, characterized in that: include: The cutter assembly according to any one of claims 1 to 9, wherein the cutter assembly is arranged at a pole piece cutting station (310).

11. A method for processing a pole piece, the method being applicable to the pole piece production line according to claim 10, 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.

Images