Pole piece manufacturing equipment, battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model provides pole piece manufacturing equipment, a battery monomer, a battery device and electric equipment, and relates to the technical field of batteries. The pole piece manufacturing equipment comprises a die cutting device, a spraying device and a conveying device, wherein the die cutting device is used for die cutting of a pole piece; the spraying device is used for spraying the die-cut pole piece and forming an insulating coating for coating burrs on the cutting surface of the pole piece on the cutting surface of the die-cut pole piece, and the conveying device is used for conveying the pole piece. The spraying device is used for forming the insulating coating on the cutting surface of the pole piece to wrap the burrs, so that the possibility that the burrs of the pole piece pierce the isolating membrane and are in contact with the adjacent pole piece to cause short circuit is reduced, and the adverse effect of the burrs on the safety and performance of the battery device is further reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to an electrode fabrication apparatus, a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the production process of battery devices, electrode sheets need to be die-cut. The cut surfaces of the die-cut electrode sheets produce burrs, which have an adverse effect on the safety and performance of the battery device. Therefore, how to reduce the adverse effects of burrs on the safety and performance of battery devices is a research direction in battery technology. Utility Model Content

[0004] This application provides an electrode fabrication apparatus, a battery cell, a battery device, and an electrical device, which can reduce the adverse effects of burrs on the electrode on the safety and performance of the battery device.

[0005] In a first aspect, embodiments of this application provide an electrode manufacturing apparatus, including a die-cutting device, a spraying device, and a conveying device. The die-cutting device is used to die-cut the electrode; the spraying device is used to spray the die-cut electrode and form an insulating coating on the cut surface of the die-cut electrode to cover the burrs on the cut surface of the electrode; the die-cutting device and the spraying device are located on the conveying path of the conveying device, and the die-cutting device is used to die-cut the electrode on the conveying device.

[0006] By adopting the above technical solution, an insulating coating is formed on the cut surface of the electrode sheet by a spraying device to cover the burrs. This reduces the possibility of the burrs piercing the separator and coming into contact with adjacent electrodes, thus reducing the adverse effects of burrs on the safety and performance of the battery device. In addition, the electrode sheet manufacturing equipment is equipped with a conveying device to transport the electrode sheets. The spraying device can spray the electrode sheets during the transport process without affecting the original production cycle of the electrode sheets, reducing the impact of the burr spraying process on the production efficiency of the electrode sheets.

[0007] In some embodiments of this application, the spraying device includes a first spraying assembly located on one of opposite sides of the conveying device along a first direction and facing the slit generated by the electrode sheet after die cutting, the first direction intersecting the electrode sheet conveying direction of the conveying device.

[0008] By adopting the above technical solution, the spraying device is designed to include a first spraying component, which is located on one side of the conveying device along the first direction. While spraying the edge blank area of ​​one surface of the electrode, the first spraying component forms an insulating coating that wraps around the burrs on the cut surface of the electrode. It is multi-functional and does not require separate spraying structures for the edge or cut surface of the electrode.

[0009] In some embodiments of this application, the spraying apparatus includes a second spraying assembly, the first spraying assembly being located on the opposite side of the conveying device along the first direction and facing the slit created by the electrode sheet after die cutting.

[0010] Using the above technical solution, the second spraying component not only sprays the edge blank area of ​​the other surface of the electrode sheet, but also forms an insulating coating that wraps around the burrs on the cut surface. Moreover, the first and second spraying components can spray the burrs on the cut surface in two directions, which improves the wrapping effect of the insulating coating on the burrs and further reduces the possibility of burrs being exposed.

[0011] In some embodiments of this application, the electrode fabrication apparatus further includes a heating device for heating the insulating coating.

[0012] The above technical solution includes a heating device, which can improve the curing efficiency of the insulating coating, thereby facilitating the subsequent assembly of the electrode sheets.

[0013] In some embodiments of this application, the heating device includes a first heating component located on one of opposite sides of the conveying device along a first direction and facing the slit generated by the electrode sheet after die cutting. The first direction intersects the electrode sheet conveying direction of the conveying device.

[0014] By adopting the above technical solution, the heating device is designed to include a first heating component located on one side of the conveying device along the first direction. The first heating component can simultaneously heat one surface and the cut surface of the electrode, making it multifunctional.

[0015] In some embodiments of this application, the heating device further includes a second heating component located on the opposite side of the conveying device along the first direction and facing the slit generated by the electrode sheet after die cutting.

[0016] Using the above technical solution, the second heating component can simultaneously heat the other surface and the cut surface of the electrode, making it multifunctional and improving heating efficiency when used in conjunction with the first heating component.

[0017] In some embodiments of this application, the electrode fabrication equipment further includes an installation structure, and the conveying device, the die-cutting device, and the spraying device are all connected to the installation structure.

[0018] By adopting the above technical solution, the conveying device, die-cutting device and spraying device are integrated into a whole through the installation structure, which improves the overall integrity of the equipment. Moreover, the newly added spraying device is directly installed on the installation structure without the need to configure an installation foundation for it.

[0019] Secondly, this application provides a battery cell including a housing and an electrode assembly installed in the housing. The electrode assembly is made by the electrode fabrication equipment described above, and the burrs on the cut surfaces of the electrode are provided with an insulating coating.

[0020] In some embodiments of this application, the thickness of the insulating coating on the cut surface of the electrode sheet ranges from 1 mm to 5 mm.

[0021] By adopting the above technical solution, the size of the insulating coating is designed to be 1mm to 5mm, so that the insulating coating can better cover the burrs.

[0022] In some embodiments of this application, the size of the insulating coating ranges from 20 μm to 200 μm along the thickness direction of the electrode.

[0023] Using the above technical solution, the size of the insulating coating is designed to be 20μm to 200μm along the thickness direction of the electrode sheet, which can better wrap and protect the burrs.

[0024] Thirdly, embodiments of this application provide a battery device comprising a battery cell of any one of the above-described technical solutions.

[0025] Fourthly, embodiments of this application provide an electrical device, including the battery cell or battery device described above. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the battery device provided in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application;

[0030] Figure 4 Electrode assembly of a battery cell provided in the embodiments of this application

[0031] Figure 5 This is a schematic diagram of the electrode fabrication equipment provided in the embodiments of this application;

[0032] Figure 6 This is a partial structural diagram of the positive electrode sheet provided in the embodiments of this application after the insulating coating is applied.

[0033] Figure 7 This is a schematic diagram of the structure of the positive electrode sheet provided in the embodiments of this application after the insulating coating is applied.

[0034] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0035] 1000, vehicles;

[0036] 100. Battery device;

[0037] 10. Battery housing;

[0038] 1. First box;

[0039] 2. Second housing;

[0040] 20. Battery cell; 21. Casing; 211. Casing body; 212. End cap; 22. Electrode assembly; 221. Positive electrode plate; 2211. Positive electrode plate body; 2212. Positive electrode tab; 2213. Insulating coating; 2214. Burr; 222. Negative electrode plate; 223. Separator;

[0041] 200. Controller;

[0042] 300. Motor;

[0043] 400. Electrode manufacturing equipment; 410. Die-cutting device; 420. Spraying device; 421. First spraying assembly; 422. Second spraying assembly; 430. Conveying device; 431. Conveying roller; 440. Heating device; 441. First heating assembly; 442. Second heating assembly;

[0044] X, the first direction; Y, the second direction. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0047] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, H and / or B can represent: H existing alone, H and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, "multiple" means two or more (including two).

[0052] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0053] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0054] In some embodiments, the battery device may be a battery pack, which includes a battery housing and one or more individual battery cells housed within the battery housing.

[0055] As an example, a battery cell assembly can be a battery module, which can be housed in a battery housing by fixing the battery module in the battery housing.

[0056] As an example, battery cell assemblies can also be housed in a battery housing by directly fixing multiple battery cells to the battery housing.

[0057] As an example, the battery enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the battery enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0058] As an example, the battery enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, so that the interior of the battery enclosure forms an enclosed space to house individual battery cells.

[0059] As an example, the battery pack can be part of the vehicle's chassis structure. For instance, the top cover of the battery pack can be at least part of the vehicle's floor, or the frame of the battery pack can be at least part of the vehicle's crossbeams and longitudinal beams.

[0060] In some embodiments, the battery device refers to an energy storage device, which includes a battery housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0061] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0062] The battery cell mentioned in the embodiments of this application may include an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The battery cell mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The positive electrode includes a positive current collector and a positive active material layer, with the positive active material layer coated on the surface of the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area. The positive electrode coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative electrode active material layer, while the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0063] Battery assembly requires die-cutting of electrode sheets, which involves cutting coated electrode sheets into individual pieces of specific shapes and sizes to facilitate subsequent battery assembly. After die-cutting, the molten slag on the cut surfaces cools and forms burrs.

[0064] Burrs can cause abnormal contact between the positive and negative electrode materials inside the battery, leading to physical short circuits and increasing the battery's self-discharge rate. Furthermore, sharp burrs may penetrate the internal separator of the battery, causing internal short circuits, which could lead to overheating, fire, or even explosion, seriously endangering the battery's safety performance. Burrs can also interfere with the electrochemical reactions inside the battery, affecting the battery's charge / discharge efficiency and cycle life.

[0065] The relevant technologies use grinding or flattening to remove burrs, which not only requires stopping the machine after die-cutting, reducing production efficiency, but also easily damages the electrode structure.

[0066] Therefore, how to reduce the impact of burrs on the performance and safety of battery devices is an important issue in the research and development of battery devices and related components.

[0067] In view of this, this application provides a technical solution that sprays an insulating coating onto the burrs after they are formed, thereby solving the above-mentioned technical problems.

[0068] The battery cells described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0069] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0070] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0071] Combined with appendix Figure 1 As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, the battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0072] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0073] Combined with appendix Figure 2 As shown, this application provides a battery device 100, including a battery housing 10 and battery cells 20 installed inside the battery housing 10.

[0074] The battery device 100 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Both the battery cell 20 and the battery device 100 can be cylindrical, flat, cuboid, or other shapes.

[0075] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via a busbar.

[0076] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0077] In some embodiments, the battery device 100 may be a battery pack, which includes a battery housing 10 and one or more individual battery cells housed within the battery housing 10.

[0078] As an example, the battery cell assembly can be a battery module, which can be housed in the battery housing 10 by fixing the battery module in the battery housing 10.

[0079] As an example, the battery cell assembly can also be housed in the battery housing 10 by directly fixing multiple battery cells 20 to the battery housing 10.

[0080] The battery housing 10 provides a space for housing the battery cells 20, and the battery housing 10 can adopt various structures. In some embodiments, the battery housing 10 may include a first housing 1 and a second housing 2, which cover each other, and the first housing 1 and the second housing 2 together define a space for housing the battery cells 20.

[0081] As an example, the battery housing 10 may be part of the chassis structure of the vehicle 1000. For example, the battery housing 10 may be at least part of the floor of the vehicle 1000, or the frame of the battery housing 10 may be at least part of the crossbeams and longitudinal beams of the vehicle 1000.

[0082] Combined with appendix Figure 3and 4 As shown, this application provides a battery cell 20, including a housing 21 and an electrode assembly 22 installed in the housing 21. The electrode assembly 22 includes a negative electrode 222, a positive electrode 221 and a separator 223 located between the two.

[0083] In some embodiments, the positive electrode 221 includes an integrally connected positive electrode body 2211 and a positive electrode tab 2212, and the positive electrode body 2211 is coated with a positive active material layer. The negative electrode 222 includes an integrally connected negative electrode body and a negative electrode tab (not shown in the figure), and the negative electrode body is coated with a negative active material layer.

[0084] After die-cutting, the positive electrode 221 can be coated with an insulating coating 2213 to cover the burrs 2214 on its cut surface, and / or, after die-cutting, the negative electrode 222 can be coated with an insulating coating 2213 to cover the burrs 2214 on its cut surface.

[0085] The battery cell 20 may also include an adapter (not shown in the figure). The housing 21 includes a housing body 211 and an end cap 212. The housing body 211 has an open structure at the top. The electrode assembly 22 is installed inside the housing 21. The end cap 212 covers the housing body 211 and is connected to the electrode tab of the electrode assembly 22 through the adapter.

[0086] Combined with appendix Figure 5 As shown, this application embodiment provides an electrode manufacturing apparatus 400, including a die-cutting device 410, a spraying device 420, and a conveying device 430. The die-cutting device 410 is used to die-cut the electrode sheet; the spraying device 420 is used to spray the die-cut electrode sheet and form an insulating coating 2213 covering the burrs 2214 on the cut surface of the die-cut electrode sheet; the conveying device 430 is used to convey the electrode sheet, and the die-cutting device 410 and the spraying device 420 are located on the conveying path of the conveying device 430.

[0087] The die-cutting device 410 can be a laser cutting device, a die punching device, or a disc shear slitting device, etc., which will not be listed one by one in this embodiment.

[0088] The die-cutting device 410 is mainly used to cut the coated and dried electrode sheet into single pieces of specific shapes and sizes. In some embodiments, the electrode sheet is usually provided with an insulation protection zone adjacent to the coating area before cutting. The insulation protection zone is coated with an insulation protection layer. The die-cutting device 410 is used to die-cut the area of ​​the electrode sheet with the insulation protection layer, such as forming a positive electrode tab 2212 on the positive electrode sheet 221, so as to facilitate the subsequent assembly of the battery device 100.

[0089] The spraying device 420 may include a spray gun and a feeding structure (not shown) for providing insulating material to the spray gun. The spraying device 420 can spray the burrs 2214 protruding from the cut surface and form an insulating coating 2213 covering the burrs 2214.

[0090] The insulating coating 2213 effectively isolates the burr 2214 from contact with other internal components of the battery. Even if the burr 2214 punctures the separator 223, it cannot make physical contact with adjacent electrodes, significantly reducing the risk of internal short circuits caused by the burr 2214 and improving the product safety of the battery device 100. In addition, it also reduces the scrap rate of the battery device caused by the burr 2214 problem, improves the product yield of lithium-ion batteries, and achieves the goal of cost reduction and efficiency improvement.

[0091] Furthermore, the insulating coating 2213 provides an additional insulating barrier for the tabs, preventing internal short circuits and effectively preventing premature degradation of battery performance. The insulating coating 2213, after covering the burrs 2214, reduces unintended contact between the positive and negative electrode materials, thereby effectively reducing the self-discharge rate of the battery device 100 and improving its energy retention capability.

[0092] In addition, the insulating coating 2213 can effectively resist physical damage and chemical corrosion, thereby optimizing the long-term reliability and durability of the battery.

[0093] The conveying device 430 may include a plurality of conveying rollers 431, which may be arranged at intervals in the horizontal direction and cover the entire die-cutting process and spraying process. That is, in this embodiment, the die-cutting device 410 and the spraying device 420 are located on the conveying path of the conveying device 430.

[0094] Taking the process of conveying the positive electrode sheet 221 in the diagram by the conveying device 430 as an example, during the conveying process, the die-cutting device 410 performs die-cutting on the positive electrode sheet 221 on the conveying device 430. After being cut and shaped, the positive electrode sheet 221 continues to be conveyed to the spraying device 420. The spraying device 420 sprays the positive electrode sheet 221 after it has been die-cut and is being conveyed, so that the burrs 2214 on the cut surface of the positive electrode sheet 221 are coated to form Figure 6 and 7 The insulating coating 2213 in it.

[0095] In this embodiment, a conveying device 430 is configured on the electrode manufacturing equipment 400. The conveying device 430 is used to convey the electrode, and the spraying device 420 can spray the electrode during the conveying process without affecting the original production cycle of the electrode, thus reducing the impact of the burr 2214 spraying process on the electrode production efficiency.

[0096] In some examples, the spraying device 420 may optionally include a first spraying assembly 421 located on one of opposite sides of the conveying device 430 along a first direction X and facing the slit generated after the electrode is die-cut. The first direction X intersects the electrode conveying direction of the conveying device 430, which is the second direction Y in the figure.

[0097] The first spraying assembly 421 may include a first spray gun, to Figure 6 and 7 Taking the positive electrode 221 as an example, the first direction X can be the arrangement direction of the two opposite surfaces of the positive electrode 221. In some embodiments, the first direction X can be the vertical direction.

[0098] The first spraying component 421 can be located above or below the positive electrode sheet 221 during transport. The first spraying component 421 is aligned with the cut seam of the positive electrode sheet 221 and can spray the cut edges and burrs 2214 on the cut surface of the positive electrode sheet 221. While forming the insulating coating 2213, it can also cover at least a portion of the aforementioned insulating protective layer, improving the insulation effect. Alternatively, in some embodiments, the original edge of the positive electrode sheet 221 does not have an insulating protective layer; instead, the insulating coating 2213 is used directly as the insulating protective layer in the area around the edge of the positive electrode sheet 221.

[0099] The insulating coating 2213 can provide an ion diffusion pathway but is insulated from electronics, without affecting the capacity of the active material in the electrode coating area. At the same time, it can reduce the possibility of short circuit in the battery device 100 and can also improve the energy density of the battery device 100 to a certain extent.

[0100] The spraying device 420 is designed to include a first spraying component 421, which is located on one side of the conveying device 430 along the first direction X. While spraying the edge blank area of ​​one surface of the electrode, the first spraying component 421 forms an insulating coating 2213 that wraps the burrs 2214 on the cut surface of the electrode. It is multi-functional and does not require separate spraying structures for the edge or cut surface of the electrode.

[0101] In some examples, the spraying device 420 may optionally include a second spraying assembly 422, with the first spraying assembly 421 located on the opposite side of the conveying device 430 along the first direction X and positioned toward the slit created by the electrode after die-cutting.

[0102] The second spraying assembly 422 may include a second spray gun whose nozzle can be aligned with the slit of the electrode sheet. In some embodiments, one of the first spraying assembly 421 and the second spraying assembly 422 is located above the electrode sheet in transit, and the other is located below the electrode sheet in transit.

[0103] While the second spraying component 422 forms an insulating coating 2213 on the cut surface, it can also cover the original insulating protective layer of the electrode on the edge of another surface of the electrode to improve the insulation effect. Alternatively, the original edge of the electrode may not have an insulating protective layer, and the insulating coating 2213 may be used directly as the insulating protective layer of the electrode edge.

[0104] The first spraying assembly 421 and the second spraying assembly 422 can simultaneously spray the edges of the upper and lower surfaces of the electrode sheet, and can also perform double spraying on the burrs 2214 to form a more stable insulating coating 2213.

[0105] The second spraying component 422 in this embodiment not only sprays the edge of the other surface of the electrode sheet, but also forms an insulating coating 2213 on the cut surface to cover the burrs 2214. Moreover, the first spraying component 421 and the second spraying component 422 can spray the burrs 2214 on the cut surface in two directions, which improves the covering effect of the insulating coating 2213 on the burrs 2214 and further reduces the possibility of the burrs 2214 being exposed.

[0106] Combined again with the appendix Figure 5 As shown, in some examples, the electrode fabrication apparatus 400 may optionally include a heating device 440 for heating the insulating coating 2213.

[0107] The heating device 440 can also be located on the path of the electrode conveyor belt of the conveying device 430. After the spraying device 420 sprays the electrode, the above-mentioned insulating coating 2213 can be dried.

[0108] In some embodiments, the heating device 440 may include an airflow heater capable of generating a heated airflow, such as a hot air gun. Of course, the heating device 440 may also include a heating structure capable of generating heat and light, such as a light heater. This embodiment will not list them in detail, as long as the above-mentioned coating can be heated to curing.

[0109] By configuring the heating device 440 to heat the insulating coating 2213 and the like, the curing efficiency of the insulating coating 2213 and the like can be improved, thereby facilitating the subsequent assembly of the electrode sheet.

[0110] In some examples, the heating device 440 may optionally include a first heating component 441 located on one of opposite sides of the conveying device 430 along a first direction X and facing the slit created by the electrode after die cutting, the first direction X intersecting the electrode conveying direction of the conveying device 430.

[0111] The first heating component 441 may include the aforementioned airflow heater or light heater. The first heating component 441 is mainly used to heat one surface of the electrode, and at the same time, due to the heat transfer effect of the electrode, it can also heat the other surface of the electrode.

[0112] In some examples, the heating device 440 may optionally include a second heating component 442 located on the opposite side of the conveying device 430 along the first direction X and positioned toward the slit created by the electrode after die cutting.

[0113] The second heating component 442 has the same or similar structure as the first heating component 441. In some embodiments, one of the first heating component 441 and the second heating component 442 is located above the electrode sheet during transportation, and the other is located below the electrode sheet during transportation.

[0114] When the first heating component 441 and the second heating component 442 work together to heat the electrode, the heating efficiency can be improved.

[0115] In some examples, the electrode fabrication equipment 400 may optionally include a mounting structure to which the conveying device 430, the die-cutting device 410, and the spraying device 420 are connected.

[0116] The mounting structure serves as the mounting base for the conveying device 430, the die-cutting device 410, and the spraying device 420, and the mounting mechanism can also be used to mount the aforementioned heating device 440.

[0117] There are various structural forms for the mounting structure, such as frame structure, plate structure or box structure, etc. The material can be metal or alloy material, or plastic with a certain structural strength. The mounting structure needs to have a certain structural length to meet the needs of the conveying device 430 for electrode sheet conveying.

[0118] The conveying device 430, die-cutting device 410 and spraying device 420 are integrated into a single unit by the installation structure, which improves the overall integrity of the equipment. In addition, the newly added spraying device 420 and heating device 440 are directly installed on the installation structure without the need for a mounting foundation.

[0119] The electrode fabrication method using the aforementioned electrode fabrication equipment 400 includes the following steps:

[0120] Die-cut the electrode sheets;

[0121] An insulating material is sprayed onto the die-cut electrode to form an insulating coating 2213 that covers the burrs 2214 on the cut surface of the electrode.

[0122] The electrode cutting can be performed by the die-cutting device 410 described above, and the spraying of insulating material can be performed by the spraying device 420 described above. Since the structures of the die-cutting device 410 and the spraying device 420 have been described above, they will not be repeated in this embodiment.

[0123] In this embodiment, an insulating coating 2213 is sprayed onto the cut surface of the electrode to cover the burrs 2214, which reduces the possibility of the electrode burrs 2214 piercing the separator 223 and coming into contact with adjacent electrodes, thus reducing the adverse effects of the burrs 2214 on the safety and performance of the battery device 100.

[0124] The steps of die-cutting the electrode sheet and spraying insulating material onto the die-cut electrode sheet are both performed during the electrode sheet conveying process.

[0125] The electrode sheet can be transported by the aforementioned transport device 430. During the transport process, the electrode sheet is first cut, and the die-cut electrode sheet is continuously transported to the spraying station, where it is sprayed by the spraying device 420 to form the aforementioned insulating coating 2213.

[0126] During the spraying process, the electrode conveying device 430 does not need to be stopped, thus not affecting the original production cycle of the electrode and reducing the impact of the burr 2214 spraying process on the electrode production efficiency.

[0127] Combined again with the appendix Figure 3 As shown, based on the above-mentioned electrode fabrication equipment, this application embodiment provides a battery cell 20, including a housing 21 and an electrode assembly 22 installed in the housing 21. The electrode assembly 22 includes an electrode sheet, which is made by the electrode fabrication equipment of the above-mentioned technical solution. The burrs on the cut surface of the electrode sheet are provided with an insulating coating 2213.

[0128] The electrode assembly 22 includes a positive electrode 221 and a negative electrode 222. Taking the positive electrode 221 as an example, the positive electrode 221 forms the aforementioned burrs 2214 and an insulating coating 2213 that covers the burrs 2214 during die cutting.

[0129] In some embodiments, the insulating coating 2213 is made of boehmite.

[0130] Boehmite is used as the material for the insulating coating 2213. Boehmite has excellent insulation properties and sufficient chemical and electrochemical stability, thereby improving the insulation treatment effect on burrs 2214.

[0131] Furthermore, in related technologies, if the edge of the electrode itself has an insulating protective layer, the material of the insulating protective layer mostly includes boehmite. Therefore, after the boehmite coating in this embodiment is applied, it can be better integrated with the original insulating protective layer of the electrode edge.

[0132] Of course, the material of the insulating coating 2213 in this embodiment is not limited to boehmite, but can also be epoxy resin, polyurethane, ceramic and other materials, which will not be listed one by one in this embodiment.

[0133] Combined with appendix Figure 6 and 7 As shown, in some examples, optionally, the thickness 'a' of the insulating coating 2213 on the cut surface of the electrode sheet ranges from 1 mm to 5 mm.

[0134] Taking the positive electrode 221 as an example, the thickness dimension 'a' of the insulating coating 2213 on the cut surface of the positive electrode 221 can be 1mm, 2mm, 3mm, 4mm, or 5mm, etc.

[0135] The reason for adopting the above design is that the size of the burrs 2214 on the electrode cutting surface is usually around 0.1mm to 2mm. Therefore, when the size of the insulating coating 2213 is the above value, the insulating coating 2213 can better wrap the burrs 2214 and reduce the risk of the burrs 2214 being exposed.

[0136] In some embodiments, the size of the insulating coating 2213 ranges from 1 mm to 2 mm.

[0137] Taking the positive electrode 221 as an example, along the arrangement direction from the positive electrode tab 2212 to the positive electrode body 2211 of the positive electrode 221, the size a of the insulating coating 2213 can be 1mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm and 2mm, etc., which will not be listed one by one in this embodiment.

[0138] The reason for adopting this design is that, along the arrangement direction from the positive electrode tab 2212 of the positive electrode 221 to the positive electrode body 2211, the insulating coating 2213 increases the width of the electrode. If the size of the insulating coating 2213 is too large, it will easily affect the subsequent assembly of the electrode.

[0139] Therefore, in this embodiment, the size of the insulating coating 2213 is designed to be 1mm to 2mm. This ensures that the insulating coating 2213 can better wrap the burr 2214 while preventing the width of the electrode from being too large. This reduces the possibility that the insulating coating 2213 may affect the subsequent electrode assembly or interfere with other structures.

[0140] In some examples, optionally, the size of the insulating coating 2213 ranges from 20 μm to 200 μm along the thickness direction of the electrode.

[0141] Taking the positive electrode 221 as an example, the thickness direction of the positive electrode 221 can be the first direction X in the figure. The size of the insulating coating 2213 along the thickness direction of the positive electrode 221 can be understood as the width of the insulating coating 2213 on the cut surface of the positive electrode 221.

[0142] In some embodiments, along the thickness direction of the positive electrode 221, the size b of the insulating coating 2213 can be 20μm, 50μm, 100μm, 150μm, and 200μm, etc., which will not be listed one by one in this embodiment.

[0143] Taking the positive electrode 221 as an example, along the thickness direction of the positive electrode 221, the size b of the insulating coating 2213 is designed to be 20μm to 200μm, which allows the insulating coating 2213 to cover the cut surface of the positive electrode 221. The insulating coating 2213 can better wrap and protect the burrs 2214. Similarly, the insulating coating 2213 of the negative electrode 222 can also be set in this way.

[0144] In some embodiments, the size of the insulating coating 2213 ranges from 30 μm to 90 μm along the thickness direction of the electrode.

[0145] Taking the positive electrode 221 as an example, along the thickness direction of the positive electrode 221, the size b of the insulating coating 2213 can be 30μm, 40μm, 50μm, 60μm, 70μm, 80μm and 90μm. This embodiment will not list them one by one.

[0146] The reason for further reducing the size range of the insulating coating 2213 along the thickness direction of the positive electrode 221 is that if the size of the insulating coating 2213 along the thickness direction of the positive electrode 221 is too large, it will easily affect the subsequent assembly of the positive electrode 221.

[0147] Therefore, in this embodiment, the size b of the insulating coating 2213 is designed to be in the range of 30μm to 90μm. This ensures that the insulating coating 2213 can better wrap the burr 2214 while preventing the thickness of the electrode from being too large. This reduces the possibility that the insulating coating 2213 will affect the subsequent electrode assembly or interfere with other structures.

[0148] Combined again with the appendix Figure 2 As shown, based on the aforementioned battery cell 20, this application embodiment provides a battery device 100, including multiple battery cells 20 of the above-described technical solutions.

[0149] Combined again with the appendix Figure 1As shown, based on the battery device 100 described above, this application embodiment also provides an electrical device, including the battery cell 20 or the battery device 100 described above. The battery device 100 is used to provide electrical energy to the electrical device, which may be a vehicle 1000.

[0150] Finally, please see the appendix. Figure 5 As shown, this application embodiment provides an electrode fabrication apparatus 400, including a die-cutting device 410, a spraying device 420, and a conveying device 430. The die-cutting device 410 is used to die-cut the electrode sheet; the spraying device 420 is used to spray the die-cut electrode sheet and form an insulating coating 2213 covering the burrs 2214 on the cut surface of the die-cut electrode sheet; the die-cutting device 410 and the spraying device 420 are located on the conveying path of the conveying device 430. The spraying device 420 includes a first spraying assembly 421, which is located on one of the opposite sides of the conveying device 430 along a first direction X and is positioned towards the slit generated on the electrode sheet after die-cutting. The first direction X intersects the electrode sheet conveying direction of the conveying device 430. The spraying device 420 also includes a second spraying assembly 422, which is located on the other side of the opposite sides of the conveying device 430 along the first direction X and is positioned towards the slit generated on the electrode sheet after die-cutting. The electrode fabrication equipment 400 also includes a heating device 440 for heating the insulating coating 2213. The heating device 440 includes a first heating component 441, located on one of opposite sides of the conveying device 430 along a first direction X, and positioned towards the slit created after die-cutting of the electrode. The first direction X intersects the electrode conveying direction of the conveying device 430. The heating device 440 also includes a second heating component 442, located on the other side of the conveying device 430 along the first direction X, and positioned towards the slit created after die-cutting of the electrode. The electrode fabrication equipment 400 also includes a mounting structure to which the conveying device 430, the die-cutting device 410, and the spraying device 420 are all connected.

[0151] It should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for the intermediate technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A pole piece manufacturing apparatus characterized by comprising: The application provides a polar plate manufacturing apparatus, comprising: a die-cutting device for die-cutting a polar plate; a spraying device for spraying the die-cut polar plate and forming an insulating coating layer covering burrs on the cut surface of the die-cut polar plate; and a conveying device for conveying a polar plate, the die-cutting device and the spraying device being located on a conveying path of the conveying device.

2. The pole piece manufacturing apparatus according to claim 1, characterized by, The spraying device comprises a first spraying assembly located on one side of the conveying device in opposite directions along a first direction intersecting the polar plate conveying direction of the conveying device and arranged towards the slit generated on the polar plate after die-cutting.

3. The pole piece manufacturing apparatus according to claim 2, characterized by, The spraying device comprises a second spraying assembly located on the other side of the conveying device in opposite directions along the first direction and arranged towards the slit generated on the polar plate after die-cutting.

4. The pole piece manufacturing apparatus according to claim 1, characterized by, The polar plate manufacturing apparatus further comprises a heating device for heating the insulating coating layer.

5. The pole piece manufacturing apparatus according to claim 4, characterized by, The heating device comprises a first heating assembly located on one side of the conveying device in opposite directions along a first direction intersecting the polar plate conveying direction of the conveying device and arranged towards the slit generated on the polar plate after die-cutting.

6. The pole piece manufacturing apparatus according to claim 5, wherein The heating device further comprises a second heating assembly located on the other side of the conveying device in opposite directions along the first direction and arranged towards the slit generated on the polar plate after die-cutting.

7. The pole piece manufacturing apparatus according to any one of claims 1 to 6, characterized by, The polar plate manufacturing apparatus further comprises a mounting structure, and the conveying device, the die-cutting device and the spraying device are connected to the mounting structure.

8. A battery cell characterized by, The application further provides a battery cell comprising a housing and an electrode assembly mounted in the housing, wherein the electrode assembly comprises a polar plate, and the polar plate is manufactured by the polar plate manufacturing apparatus according to any one of claims 1-7, and the burrs on the cut surface of the polar plate are provided with an insulating coating layer.

9. The battery cell of claim 8, wherein, The thickness of the insulating coating layer on the cut surface of the polar plate ranges from 1 mm to 5 mm.

10. The battery cell of claim 8, wherein, The size of the insulating coating layer ranges from 20 μm to 200 μm along the thickness direction of the polar plate.

11. A battery device characterized by comprising: The application further provides a battery comprising a plurality of battery cells according to any one of claims 8-10.

12. An electrical device, characterized by The application further provides a battery device comprising a battery cell according to any one of claims 8-10 or a battery according to claim 11.

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