Battery monomer manufacturing method and equipment, battery device and power-consuming device

Abstract

The present application provides a method for manufacturing a battery cell and its equipment, a battery device and an electric device. The method for manufacturing a battery cell includes: providing an insulating film coating device, including an upper shell, a lower shell and a lifting and loading assembly, the upper shell having a first chamber, the lower shell including a bearing portion, the bearing portion including an avoidance hole, and the lifting and loading assembly being arranged corresponding to the avoidance hole; providing an insulating film, connecting the insulating film to the bearing portion and covering the avoidance hole, and the lifting and loading assembly being located below the insulating film; providing a battery cell, including a shell and an end cover, placing the battery cell on the insulating film, the battery cell and the avoidance hole being arranged correspondingly, and the lifting and loading assembly lifting the battery cell; the upper shell and the lower shell are butt-sealed, the battery cell is located in the first chamber, and the first chamber is evacuated; the lifting and loading assembly drives the battery cell to descend, the shell presses down the insulating film, and the insulating film is attached to the outer surface of the shell under the action of atmospheric pressure; after the insulating film and the outer surface of the shell are attached, a battery cell coated with the insulating film is obtained.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method for manufacturing a battery cell and equipment thereof, a battery device, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery device technology is an important factor related to their development.

[0003] A battery cell includes a battery cell and an insulating film. The outer surface of the battery cell needs to be coated with an insulating film. In the existing battery cell manufacturing process, the insulating film coated on the outer surface of the battery cell has an overlap area. The butt joint edge of the insulating film in the overlap area needs to be bonded and fixed. However, there is a possibility that the butt joint edge of the insulating film in the overlap area may be lifted. Therefore, how to reduce the lifting phenomenon of the insulating film coated on the outside of the battery cell has become a problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above problems, the present application provides a battery cell manufacturing method and equipment, a battery device and an electrical device, which can effectively avoid the problem of warping of the insulating film.

[0005] The present application provides a method for manufacturing a battery cell, which comprises:

[0006] An insulating film coating device is provided, the insulating film coating device comprising an upper shell, a lower shell and a lifting and loading assembly, the upper shell having a first chamber, the lower shell comprising a bearing portion, the bearing portion comprising an avoidance hole, and the lifting and loading assembly being arranged corresponding to the avoidance hole;

[0007] Providing an insulating film, connecting the insulating film to the bearing part, the insulating film covering the avoidance hole, and the lifting and loading assembly being located below the insulating film;

[0008] Providing a battery cell, the battery cell comprising a shell and an end cover, placing the battery cell on an insulating film, the shell being in contact with the insulating film, the battery cell being arranged corresponding to the avoidance hole, and the lifting and lowering loading assembly lifting the battery cell;

[0009] The upper shell and the lower shell are butt-jointed and sealed, the battery cell is located in the first chamber, and the first chamber is evacuated;

[0010] The lifting load assembly drives the battery cell to descend, the shell presses down the insulating film, the battery cell passes through the avoidance hole, and the insulating film adheres to the outer surface of the shell under the action of atmospheric pressure;

[0011] After the insulating film is bonded to the outer surface of the shell, the first chamber is vacuum-broken to obtain a battery cell coated with the insulating film.

[0012] The battery cell manufacturing method of the embodiment of the present application uses an insulating film coating device to support the insulating film used to coat the battery cell. After the upper shell and the lower shell are docked, the first chamber is evacuated to allow the insulating film to be attached to the outer shell of the battery cell under the action of atmospheric pressure. By attaching a whole insulating film to the outer shell of the battery cell, the insulating film can form an integral cylindrical structure directly on the outer shell of the battery cell, so that there is no overlapping area of ​​the insulating film coated on the battery cell, which effectively prevents the insulating film from warping, thereby reducing the possibility of local insulation failure caused by the warping of the insulating film. At the same time, the thickness of the insulating film is uniform at all positions, reducing the possibility of a decrease in the energy density of the battery cell due to uneven thickness.

[0013] In some achievable embodiments, after the first chamber is evacuated, the insulating film is heated to soften the insulating film.

[0014] After being heated, the insulating film becomes softer and is easier to stretch and deform when pressed by the battery cell, reducing the possibility of tearing and damage caused by the tensile force on the insulating film itself. In addition, the further softened insulating film is also relatively easier to match the outer surface of the shell, thereby ensuring that the insulating film and the shell fit well, making it difficult for bubbles to form between the insulating film and the shell. In the case where the shell has pits, the soft insulating film can also easily match the shape, so that the area of ​​the insulating film corresponding to the pit of the shell also forms a corresponding recess, making it difficult for bubbles to form between the insulating film and the shell.

[0015] In some possible implementations, the insulating film is heated by delivering a hot gas flow directly to the insulating film.

[0016] The method of heating the insulating film with hot air flow is conducive to uniform heat diffusion, so that each area of ​​the insulating film itself is heated evenly, ensuring good temperature consistency in each area of ​​the insulating film, and then ensuring good consistency in the bonding effect between the insulating film and the shell. The method of heating the insulating film with hot air flow is a direct heating method for the insulating film, which is conducive to reducing heat loss and improving heating efficiency and heating effect.

[0017] In some possible implementations, the carrier part is heated so that the carrier part heats the insulating film.

[0018] The carrier part can heat the insulating film by gradually releasing its own heat, so there is no need to continuously heat the carrier part, which is beneficial to reducing energy consumption.

[0019] In some practicable manners, an annular pressing frame is used to press the edge of the insulating film onto the bearing portion. After the insulating film is attached to the outer surface of the housing, the annular pressing frame is lifted to release the insulating film.

[0020] The edge of the insulating film is pressed onto the bearing part by an annular pressing frame to effectively fix the position of the insulating film and ensure that the edge of the insulating film is not easily separated from the bearing part when the battery cell presses down the insulating film. The insulating film can seal the gap between the annular pressing frame and the bearing part to prevent air leakage through the gap between the annular pressing frame and the bearing part.

[0021] After the insulating film is attached to the outer surface of the housing, the annular pressing frame is lifted to release the insulating film. After the annular pressing frame is lifted, the insulating film can be separated from the bearing part without the need for additional separation operations on the insulating film, which is conducive to simplifying the processing procedures and improving processing efficiency.

[0022] In some achievable ways, the insulating film coating device further comprises a pressing assembly. Before the upper shell and the lower shell are butted and sealed, the pressing assembly and the lifting and loading assembly clamp the battery cell. The pressing assembly and the lifting and loading assembly drive the battery cell to press down the insulating film.

[0023] After the battery cell is placed in the area corresponding to the avoidance hole on the insulating film, the lifting and lowering loading assembly can lift the battery cell. Then the clamping assembly moves from the top of the battery cell to the battery cell, and finally contacts the battery cell, so that the clamping assembly and the lifting and lowering loading assembly clamp the battery cell together. The end cover of the battery cell faces the clamping assembly. The clamping assembly can be pressed against the end cover of the battery cell. The bottom plate of the battery cell's outer shell faces the lifting and lowering loading assembly. The clamping assembly and the lifting and lowering loading assembly can drive the battery cell to descend so that the battery cell can complete the insulating film coating action. After the insulating film and the battery cell are completely bonded, the clamping assembly and the lifting and lowering loading assembly can drive the battery cell to rise. When the battery cell rises to the position where it passes through the avoidance hole, it stops rising. The clamping assembly releases the battery cell, and then the battery cell coated with the insulating film can be taken away.

[0024] In some achievable embodiments, the pressing assembly includes a pressing plate. The pressing plate includes an escape recess. The battery cell includes an electrode terminal. The electrode terminal is disposed on an end cap and the electrode terminal protrudes from the end cap. The pressing plate is pressed against the end cap, and the escape recess accommodates the electrode terminal.

[0025] The avoidance recess of the pressure plate can effectively avoid the electrode terminal, so that the pressure plate can apply downward pressure to the battery cell through the end cover without applying downward pressure to the electrode terminal, which is beneficial to reduce the possibility of structural damage due to squeezing of the electrode terminal.

[0026] In some achievable ways, after the upper shell and the lower shell are butt-jointed and sealed, the pressing assembly is located in the first chamber, the lower shell has a second chamber, the avoidance hole is connected to the second chamber, and the lifting and loading assembly is arranged in the second chamber.

[0027] The clamping assembly will not interfere with the upper shell, ensuring smooth docking between the upper shell and the lower shell. The upper shell can protect the clamping assembly, reducing the possibility of the clamping assembly causing the battery cell to shift position due to an accidental collision. The lower shell can protect the lifting and loading assembly, reducing the possibility of the lifting and loading assembly causing the battery cell to shift position due to an accidental collision.

[0028] In some practicable manners, after the insulating film is attached to the outer surface of the housing, the first chamber is broken from vacuum, and the portion of the insulating film that exceeds the end cover is cut to obtain a battery cell coated with the insulating film.

[0029] After the insulating film is attached to the outer surface of the housing, part of the insulating film may extend beyond the end cap. In this case, the part of the insulating film extending beyond the end cap needs to be cut to make the insulating film look neat.

[0030] In some practicable embodiments, a hot knife is used to cut the portion of the insulating film that extends beyond the end cap.

[0031] The electric hot knife can cut the insulating film relatively easily and ensure that burrs are not easily generated at the cutting interface.

[0032] An embodiment of the present application provides a battery cell manufacturing device, which includes an insulating film coating device, a vacuum pumping device, a battery cell conveying device, and an insulating film conveying device.

[0033] The insulating film coating device includes an upper shell, a first lifting assembly, a lower shell and a lifting and loading assembly. The upper shell has a first chamber. The lower shell includes a bearing portion. The bearing portion includes an avoidance hole. The bearing portion has an insulating film bearing surface. The insulating film bearing surface is arranged around the avoidance hole. The upper shell is connected to the first lifting assembly. The first lifting assembly is used to drive the upper shell to approach or move away from the lower shell so that the upper shell and the lower shell can be docked or separated. The lifting and loading assembly is arranged corresponding to the avoidance hole. The vacuum device is connected to the upper shell. The vacuum device is used to vacuum the first chamber of the upper shell. The battery cell conveying device is used to convey the battery cell to the insulating film coating device. The insulating film conveying device is used to convey the insulating film to the insulating film coating device.

[0034] The battery cell manufacturing equipment of the embodiment of the present application can coat the battery cell with an insulating film by means of the cooperation of an insulating film coating device, a vacuum extraction device, a battery cell conveying device, and an insulating film conveying device. The battery cell manufacturing equipment of the embodiment of the present application can coat the battery cell with an insulating film by attaching a whole insulating film to the outer shell of the battery cell so that the insulating film can directly form an integral cylindrical structure on the outer shell of the battery cell, so that there is no overlapping area of ​​the insulating film coated on the battery cell, which effectively avoids the problem of the insulating film warping, thereby reducing the possibility of local insulation failure caused by the warping of the insulating film. At the same time, the thickness of the insulating film is uniform at all positions, reducing the possibility of a decrease in the energy density of the battery cell due to uneven thickness.

[0035] In some achievable embodiments, the battery cell manufacturing equipment further includes a heating device, which includes a hot air flow outlet, and the hot air flow outlet is arranged corresponding to the avoidance hole.

[0036] After being heated, the insulating film becomes softer and is easier to stretch and deform when pressed by the battery cell, reducing the possibility of tearing and damage caused by the tensile force on the insulating film itself. In addition, the further softened insulating film is also relatively easier to match the outer surface of the shell, thereby ensuring that the insulating film and the shell fit well, making it difficult for bubbles to form between the insulating film and the shell. In the case where the shell has pits, the soft insulating film can also easily match the shape, so that the area of ​​the insulating film corresponding to the pit of the shell also forms a corresponding recess, making it difficult for bubbles to form between the insulating film and the shell.

[0037] After the insulating film is connected to the bearing part, the insulating film covers the avoidance hole. Therefore, the hot airflow discharged from the hot airflow outlet of the heating device can pass through the avoidance hole and directly heat the insulating film to soften the insulating film. The heating device transports the hot airflow to the surface of the insulating film from the side of the insulating film facing away from the battery cell. The method of heating the insulating film with hot air flow is conducive to uniform heat diffusion, so that each area of ​​the insulating film itself is heated evenly, ensuring good temperature consistency in each area of ​​the insulating film, which is conducive to ensuring good consistency in the fitting effect between the insulating film and the shell.

[0038] In some achievable embodiments, the battery cell manufacturing equipment further includes a heating device, which is used to heat the carrying part.

[0039] The load-bearing part is heated so that the load-bearing part heats the insulating film to soften the insulating film. After the load-bearing part is heated, the load-bearing part can transfer the heat to the insulating film and heat the insulating film. The load-bearing part itself can store heat. After heating the load-bearing part for a period of time, the heating can be stopped. The load-bearing part can heat the insulating film by gradually releasing its own heat, so there is no need to continuously heat the load-bearing part, which is conducive to reducing energy consumption.

[0040] In some achievable embodiments, the insulating film coating device includes an annular pressing frame and a second lifting assembly. The annular pressing frame is connected to the second lifting assembly. The annular pressing frame is arranged corresponding to the insulating film bearing surface. The second lifting assembly is used to drive the annular pressing frame to approach or move away from the insulating film bearing surface.

[0041] After the edge of the insulating film is aligned and placed on the insulating film bearing surface, the second lifting assembly drives the annular clamping frame to move close to the insulating film bearing surface so that the annular clamping frame presses the edge of the insulating film. The method of using the annular clamping frame to crimp the edge of the insulating film onto the bearing portion can effectively fix the position of the insulating film, while ensuring that when the battery cell presses down on the insulating film, the edge of the insulating film is not easily separated from the bearing portion. After the insulating film is fitted to the outer surface of the outer shell, the annular clamping frame is lifted to release the insulating film. After the annular clamping frame is lifted, the insulating film can be separated from the bearing portion, and no additional separation operation is required on the insulating film, which is conducive to simplifying the processing procedure and improving processing efficiency.

[0042] In some achievable ways, the insulating film coating device further comprises a pressing assembly. The pressing assembly is arranged corresponding to the lifting and loading assembly. The pressing assembly and the lifting and loading assembly are used to clamp the battery cell. The pressing assembly and the lifting and loading assembly are used to drive the battery cell to press down the insulating film.

[0043] After the battery cell is placed in the area corresponding to the avoidance hole on the insulating film, the lifting and lowering loading assembly can lift the battery cell. Then the clamping assembly moves from the top of the battery cell close to the battery cell, and finally contacts the battery cell, so that before the upper shell and the lower shell are butt-sealed, the clamping assembly and the lifting and lowering loading assembly can clamp the battery cell together. The end cover of the battery cell faces the clamping assembly. The clamping assembly can be pressed against the end cover of the battery cell. The bottom plate of the outer shell of the battery cell faces the lifting and lowering loading assembly. After the upper shell and the lower shell are butt-sealed, the clamping assembly and the lifting and lowering loading assembly can drive the battery cell to descend so that the battery cell can complete the insulating film coating action. After the insulating film and the battery cell are completely attached, the clamping assembly and the lifting and lowering loading assembly can drive the battery cell to rise. When the battery cell rises to the position of passing through the avoidance hole, it stops rising. The clamping assembly releases the battery cell, and then the battery cell coated with the insulating film can be taken away.

[0044] The clamping assembly and the lifting and loading assembly can clamp the battery cell from the upper and lower directions respectively to effectively fix the position of the battery cell and ensure the stability of the position of the battery cell. At the same time, the clamping assembly and the lifting and loading assembly can avoid the side panels of the outer shell, so that the clamping assembly and the lifting and loading assembly will not affect the fitting of the insulating film and the side panels of the outer shell.

[0045] In some achievable embodiments, the clamping assembly includes a pressing plate and a lifting mechanism. The pressing plate is connected to the lifting mechanism. The lifting mechanism is used to drive the pressing plate to approach or move away from the lifting and loading assembly. The pressing plate includes an avoidance recess. The opening of the avoidance recess faces the lifting and loading assembly.

[0046] The avoidance recess of the pressure plate can effectively avoid the electrode terminal, so that the pressure plate can apply downward pressure to the battery cell through the end cover without applying downward pressure to the electrode terminal, which is beneficial to reduce the possibility of structural damage due to squeezing of the electrode terminal.

[0047] In some achievable ways, the pressing assembly is connected to the upper shell, the lower shell has a second chamber, the avoidance hole is connected to the second chamber, and the lifting and loading assembly is arranged in the second chamber.

[0048] After the upper shell and the lower shell are butted and sealed, the clamping assembly is located in the first chamber of the upper shell. The clamping assembly will not interfere with the position of the upper shell, ensuring a smooth docking process between the upper shell and the lower shell. The upper shell can protect the clamping assembly, reducing the possibility of the clamping assembly causing the battery cell to shift position due to an accidental collision. The lower shell can protect the lifting and loading assembly, reducing the possibility of the lifting and loading assembly causing the battery cell to shift position due to an accidental collision.

[0049] In some achievable embodiments, the battery cell manufacturing equipment further includes an electric heating knife, which is used to cut the insulating film.

[0050] The portion of the insulating film that exceeds the end cover is cut by an electric hot knife to obtain a battery cell covered with the insulating film. The electric hot knife can cut the insulating film relatively easily and can ensure that burrs are not easily generated at the cutting interface.

[0051] An embodiment of the present application provides a battery device, which includes a battery cell manufactured using a battery cell manufacturing method.

[0052] The embodiment of the present application provides an electric device, which includes the above-mentioned battery device. The battery device is used to provide electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0054] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0055] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0056] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the application;

[0057] Figure 4 is a schematic diagram of a partial exploded structure of a battery cell provided in an embodiment of the present application;

[0058] Figure 5 is a schematic flow chart of a battery cell manufacturing method provided in one embodiment of the present application;

[0059] Figure 6 is a process schematic diagram of a battery cell manufacturing method provided in one embodiment of the present application;

[0060] Figure 7 It is a partial structural schematic diagram of a lower housing provided in one embodiment of the present application;

[0061] Figure 8 It is a partial structural schematic diagram of an insulating film provided on a lower shell body according to an embodiment of the present application;

[0062] Fig. 9 It is a partial structural schematic diagram of an upper shell provided in an embodiment of the present application;

[0063] Fig.10 It is a partial structural schematic diagram of a lower shell and an annular pressing frame pressing an insulating film provided by an embodiment of the present application;

[0064] Fig.11 It is a partial structural schematic diagram of an insulating film coating device provided in one embodiment of the present application;

[0065] Fig.12 is a process schematic diagram of a battery cell manufacturing method provided in one embodiment of the present application;

[0066] Fig.13 A schematic diagram of a partial structure of a clamping assembly provided in one embodiment of the present application;

[0067] Fig.14 A schematic diagram of a partial structure of a state where an electric hot knife is cutting an insulating film according to an embodiment of the present application;

[0068] Fig.15 A schematic diagram of a partial structure of a battery cell manufacturing device provided in one embodiment of the present application;

[0069] Fig.16 A schematic diagram of a partial structure of a battery cell manufacturing device for conveying battery cells provided in an embodiment of the present application;

[0070] Fig.17 A schematic diagram of the partial structure of a battery cell manufacturing device provided in one embodiment of the present application.

[0071] Description of reference numerals:

[0072] 1. Vehicle; 10. Battery device; 10a. Box; 10b. First box portion; 10c. Second box portion; 11. Controller; 12. Motor; 20. Battery module; 30. Battery cell; 301. Battery cell; 302. Insulating film; 40. End cap; 41. Electrode terminal; 50. Housing; 60. Electrode assembly;

[0073] 100, insulating film coating device; 110, upper shell; 111, first chamber; 120, lower shell; 121, bearing part; 121a, avoidance hole; 122, second chamber; 130, lifting and loading assembly; 131, loading plate; 132, lifting component; 140, annular clamping frame; 150, clamping assembly; 151, pressing plate; 151a, avoidance recess; 152, lifting mechanism; 160, first lifting assembly; 170, second lifting assembly;

[0074] 200, annular sealing ring; 300, electric heating knife; 310, heating component; 320, blade; 400, manipulator; 500, heating device. DETAILED DESCRIPTION

[0075] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0076] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0077] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0078] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0079] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0082] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be flat, rectangular or in other shapes, etc., and the embodiments of the present application do not limit this.

[0083] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. The battery device mentioned in the present application may be a battery pack. For example, the battery device mentioned in the present application may include a battery module, etc. The battery device generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0084] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0085] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector and a positive electrode tab connected to the positive current collector. The positive current collector is coated with a positive active material layer. The positive electrode tab is not coated with a positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector may be aluminum. The positive active material layer includes a positive active material. The positive active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0086] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector includes a negative electrode current collector and a negative electrode tab connected to the negative electrode current collector. The negative electrode current collector is coated with the negative electrode active material layer. The negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector may be copper. The negative electrode active material layer includes a negative electrode active material. The negative electrode active material may be carbon or silicon, etc.

[0087] The material of the spacer may be PP (polypropylene) or PE (polyethylene) or the like.

[0088] The inventors of the present invention have noticed that a battery cell includes a battery cell. The outer shell of the battery cell has a bottom plate and a side plate. The outer surface of the outer shell of the battery cell needs to be coated with an insulating film. The insulating film is a processed sheet blank. After the battery cell is placed at a predetermined position of the insulating film, the insulating film is folded to form a cylindrical structure coated on the outside of the battery cell. There is an overlapping area in the folded insulating film. The butt edges of the insulating film in the overlapping area need to be bonded and fixed to each other. However, there is a possibility that the butt edges of the insulating film in the overlapping area are warped. There is a possibility of insulation failure in the area where the insulating film is warped. At the same time, the thickness of the insulating film in the overlapping area is relatively thick, which affects the energy density of the battery cell.

[0089] In order to alleviate the problem of warping of the butt edge of the insulating film in the overlapping area, the applicant has found that the insulating film can be integrally formed into the cell housing so that the insulating film as a whole directly forms a cylindrical structure, so that there is no overlapping area on the insulating film.

[0090] Based on the above considerations, in order to solve the problem of the insulation film warping at the butt joint area, the inventors have designed a battery cell manufacturing method after in-depth research. In the battery cell manufactured by the battery cell manufacturing method, the insulation film is an integrally formed structure, so there is no overlap area on the insulation film, which effectively avoids the problem of the insulation film warping.

[0091] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0092] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0093] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including a box and electrical devices using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0094] Figure 1 The partial structure of the vehicle 1 is schematically shown. Figure 1 As shown, vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is arranged inside the vehicle 1. The battery device 10 can be arranged at the bottom, head or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can be used as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to power the motor 12. For example, it is used for the working power demand of the vehicle 1 during startup, navigation and driving.

[0095] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, thereby replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0096] In order to meet different power requirements, the battery device 10 may include multiple battery cells. A battery cell refers to the smallest unit that constitutes a battery module or a battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for use in various applications. The battery device 10 mentioned in the present application includes a battery module or a battery pack. Among them, multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection refers to a mixture of series and parallel connection. In the embodiments of the present application, multiple battery cells can directly form a battery pack, or they can first form a battery module 20, and the battery module 20 can then form a battery pack.

[0097] Figure 2 The structure of the battery device 10 is schematically shown. Figure 2 As shown, the battery device 10 includes a housing 10a and a battery cell (not shown). The battery cell is accommodated in the housing 10a.

[0098] The box 10a can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres, which is not limited in the present embodiment. The box 10a can be made of alloy materials such as aluminum alloy, iron alloy, polymer materials such as polycarbonate, polyisocyanurate foam plastic, or composite materials such as glass fiber and epoxy resin, which is not limited in the present embodiment.

[0099] The box 10a is used to accommodate battery cells, and the box 10a can be a variety of structures. In some embodiments, the box 10a may include a first box portion 10b and a second box portion 10c. The first box portion 10b and the second box portion 10c cover each other. The first box portion 10b and the second box portion 10c jointly define a storage space for accommodating battery cells. The second box portion 10c may be a hollow structure with one end open. In some embodiments, the first box portion 10b is a plate-like structure. The first box portion 10b covers the open side of the second box portion 10c to form a box 10a with a storage space. In some embodiments, the first box portion 10b and the second box portion 10c may also be hollow structures with one side open. The open side of the first box portion 10b covers the open side of the second box portion 10c to form a box 10a with a storage space. Of course, the first box portion 10b and the second box portion 10c may be in a variety of shapes, such as a cylinder, a cuboid, and the like.

[0100] In order to improve the sealing performance after the first box body 10b and the second box body 10c are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 10b and the second box body 10c.

[0101] In some embodiments, the first box body portion 10b covers the top of the second box body portion 10c. The first box body portion 10b can also be called an upper box cover, and the second box body portion 10c can also be called a lower box.

[0102] In the battery device 10, there can be one or more battery cells. When there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 10a. Of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module. Multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 10a.

[0103] In some embodiments, Figure 3 The structure of the battery module 20 is schematically shown. Figure 3 As shown, there may be a plurality of battery cells 30. The plurality of battery cells 30 are first connected in series, in parallel or in series to form a battery module 20. The plurality of battery modules 20 are then connected in series, in parallel or in series to form a whole and are contained in the box 10a.

[0104] The multiple battery cells 30 in the battery module 20 can be electrically connected through a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0105] In the embodiment of the present application, the battery cell 30 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., which is not limited in the embodiment of the present application. The battery cell 30 may be a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiment of the present application. However, for the sake of simplicity, the following embodiment is described by taking a square-shaped battery cell 30 as an example.

[0106] Figure 4 The partial exploded structure of the battery cell 30 is schematically shown. The battery cell 30 refers to the smallest unit constituting the battery device 10. Figure 4 As shown, the battery cell 30 includes a battery core and an insulating film. The battery core includes an end cap 40, a housing 50 and an electrode assembly 60. The insulating film covers the housing 50, so that the housing 50 is insulated from other external conductive structural parts through the insulating film.

[0107] The end cap 40 refers to a component that covers the opening of the outer shell 50 to isolate the internal environment of the battery cell 30 from the external environment. Exemplarily, the shape of the end cap 40 can be adapted to the shape of the outer shell 50 to match the outer shell 50. Exemplarily, the end cap 40 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 40 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 41 can be provided on the end cap 40. The electrode terminal 41 can be used to electrically connect to the electrode assembly 60 for outputting or inputting electrical energy of the battery cell 30.

[0108] In some embodiments, the end cap 40 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 30 reaches a threshold value. The material of the end cap 40 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 40, and the insulating component may be used to isolate the electrical connection components in the housing 50 from the end cap 40 to reduce the risk of short circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0109] The shell 50 is a component used to cooperate with the end cap 40 to form the internal environment of the battery cell 30. Among them, the formed internal environment can be used to accommodate the electrode assembly 60, the electrolyte (not shown in the figure) and other components. The shell 50 and the end cap 40 can be independent components. An opening can be set on the shell 50, and the internal environment of the battery cell 30 is formed by covering the opening with the end cap 40 at the opening. Without limitation, the end cap 40 and the shell 50 can also be integrated. Specifically, the end cap 40 and the shell 50 can form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 50, the end cap 40 is covered with the shell 50. The shell 50 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 50 can be determined according to the specific shape and size of the electrode assembly 60. The material of the shell 50 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0110] The electrode assembly 60 is a component in the battery cell 30 where electrochemical reactions occur. One or more electrode assemblies 60 may be included in the housing 50. The electrode assembly 60 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly. The parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0111] Figure 5 The flow of the method for manufacturing the battery cell 30 is schematically shown. Figure 6 The process of the method for manufacturing the battery cell 30 is schematically shown. Figure 7 A partial structure of the lower housing 120 is schematically shown. Figure 8 The schematic diagram shows a partial structure of the insulating film 302 disposed on the lower housing 120. Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the embodiment of the present application provides a method for manufacturing a battery cell 30, which includes:

[0112] An insulating film coating device 100 is provided, the insulating film coating device 100 includes an upper shell 110, a lower shell 120 and a lifting and loading assembly 130, the upper shell 110 has a first chamber 111, the lower shell 120 includes a bearing portion 121, the bearing portion 121 includes an avoidance hole 121a, and the lifting and loading assembly 130 is arranged corresponding to the avoidance hole 121a;

[0113] Provide an insulating film 302, connect the insulating film 302 to the carrying portion 121, the insulating film 302 covers the avoidance hole 121a, and the lifting and lowering loading assembly 130 is located below the insulating film 302;

[0114] Provide a battery cell 301, the battery cell 301 includes a shell 50 and an end cover 40, place the battery cell 301 on the insulating film 302, the shell 50 contacts the insulating film 302, the battery cell 301 is arranged corresponding to the avoidance hole 121a, and the lifting and loading assembly 130 lifts the battery cell 301;

[0115] The upper housing 110 and the lower housing 120 are butt-jointed and sealed, the battery cell 301 is located in the first chamber 111, and the first chamber 111 is evacuated;

[0116] The lifting load assembly 130 drives the battery cell 301 to descend, the housing 50 presses down the insulating film 302, the battery cell 301 passes through the avoidance hole 121a, and the insulating film 302 adheres to the outer surface of the housing 50 under the action of atmospheric pressure;

[0117] After the insulating film 302 is bonded to the outer surface of the housing 50 , the vacuum of the first chamber 111 is broken to obtain the battery cell 30 coated with the insulating film 302 .

[0118] In the method for manufacturing the battery cell 30 of the embodiment of the present application, the bearing portion 121 is used to support the insulating film 302. The edge of the insulating film 302 can be connected to the bearing portion 121. The insulating film 302 and the bearing portion 121 are sealed. The bearing portion 121 does not provide support for the area on the insulating film 302 corresponding to the avoidance hole 121a. The orthographic projection area of ​​the avoidance hole 121a on the bearing portion 121 on the insulating film 302 is larger than the orthographic projection area of ​​the battery cell 301 on the insulating film 302. The insulating film 302 and the bearing portion 121 are sealed, and the insulating film 302 covers the avoidance hole 121a, so that when the first chamber 111 is evacuated, there will be no air leakage between the insulating film 302 and the bearing portion 121, and no air leakage through the avoidance hole 121a will occur. The insulating film 302 itself is soft and has the property of being stretchable and deformable, so that when the battery cell 301 presses down the insulating film 302, the insulating film 302 can bear the corresponding tensile stress, and at the same time keep the insulating film 302 in a tensioned state, so as to facilitate the insulating film 302 to fit more smoothly on the outer surface of the housing 50. The insulating film 302 has a relatively small thickness. In some examples, the thickness of the insulating film 302 itself can range from 0.1 millimeters (mm) to 0.15 millimeters. Exemplarily, the thickness of the insulating film 302 itself can be 0.1 millimeters. The insulating film 302 can be, but is not limited to, a blue film.

[0119] The lifting and lowering component 130 can provide support for the battery cell 301 to keep the battery cell 301 in a stable position. The lifting and lowering component 130 is located below the insulating film 302, and the battery cell 301 is located above the insulating film 302. The avoidance hole 121a of the bearing part 121 can avoid the battery cell 301 when the battery cell 301 is pressed down.

[0120] After the first chamber 111 is evacuated, the first chamber 111 is in a negative pressure state. Therefore, the atmospheric pressure can act on the surface of the insulating film 302 facing away from the battery cell 301, so that as the battery cell 301 is gradually pressed down, the insulating film 302 can be attached to the outer surface of the shell 50 under the action of the atmospheric pressure to gradually cover the outer surface of the shell 50 until the battery cell 301 is pressed down to a predetermined position, and the insulating film 302 covers the entire shell 50. Since the insulating film 302 is thin and soft, the insulating film 302 can easily match the outer surface of the shell 50, so that the insulating film 302 can achieve a good bonding effect with the outer surface of the shell 50.

[0121] In some achievable embodiments, the upper shell 110 may be moved toward the lower shell 120 to achieve a butt-sealed connection between the upper shell 110 and the lower shell 120 .

[0122] In some practicable embodiments, after the vacuum in the first chamber 111 of the upper shell 110 is broken, the upper shell 110 and the lower shell 120 are separated and opened to break away from the sealed state, and then the battery cell 30 that has completed the insulating film 302 coating process can be taken away.

[0123] In some possible implementations, a robot can be used to hold the battery cell 301 and place the battery cell 301 on the insulating film 302 above the lifting and loading assembly 130. Figure 7 As shown, the lifting and lowering loading assembly 130 includes a loading plate 131. The loading plate 131 is arranged corresponding to the avoidance hole 121a. The area of ​​the loading plate 131 can be smaller than the area of ​​the avoidance hole 121a. The loading plate 131 can provide support for the battery cell 301 and the area on the insulating film 302 corresponding to the avoidance hole 121a.

[0124] The manufacturing method of the battery cell 30 of the embodiment of the present application uses an insulating film coating device 100 to support the insulating film 302 used to coat the battery cell 301. After the upper shell 110 and the lower shell 120 are docked, the first chamber 111 is evacuated so that the insulating film 302 can be attached to the outer shell 50 of the battery cell 301 under the action of atmospheric pressure. By attaching a whole insulating film 302 to the outer shell 50 of the battery cell 301, the insulating film 302 can directly form an integral cylindrical structure on the outer shell 50 of the battery cell 301, so that the insulating film 302 coated on the battery cell 301 does not have an overlapping area, effectively avoiding the insulating film 302 from warping, thereby reducing the possibility of local insulation failure caused by the warping of the insulating film 302. At the same time, the thickness of the insulating film 302 is uniform at all positions, reducing the possibility of a decrease in the energy density of the battery cell 30 due to uneven thickness.

[0125] In some achievable ways, Fig. 9 The partial structure of the upper housing 110 is schematically shown. Fig. 9 As shown, the upper shell 110 is provided with an annular sealing ring 200. After the upper shell 110 and the lower shell 120 are docked, the annular sealing ring 200 is used to seal the gap between the upper shell 110 and the lower shell 120 to avoid air leakage through the gap between the upper shell 110 and the lower shell 120, which is conducive to ensuring that the first chamber 111 is in a good negative pressure state.

[0126] In some achievable embodiments, at least one of the upper shell 110 and the lower shell 120 is provided with an annular sealing ring 200. After the upper shell 110 and the lower shell 120 are docked, the annular sealing ring 200 is used to seal the gap between the upper shell 110 and the lower shell 120.

[0127] In some achievable manners, after the first chamber 111 is evacuated, the insulating film 302 is heated to soften the insulating film 302. The softened insulating film 302 is then attached to the housing 50 of the battery cell 301.

[0128] After being heated, the insulating film 302 becomes softer and is more easily stretched and deformed when pressed by the battery cell 301, reducing the possibility of tearing and damage of the insulating film 302 due to the tensile force. In addition, the further softened insulating film 302 is relatively easier to match and conform to the outer surface of the shell 50, thereby ensuring that the insulating film 302 and the shell 50 fit well, making it difficult for bubbles to form between the insulating film 302 and the shell 50. In the case where the shell 50 has pits, the soft insulating film 302 can also easily match and conform, so that the area of ​​the insulating film 302 corresponding to the pit of the shell 50 also forms a corresponding recess, making it difficult for bubbles to form between the insulating film 302 and the shell 50. The temperature for heating the insulating film 302 needs to be set according to the material of the insulating film 302 itself and the softening condition.

[0129] If bubbles are generated between the insulating film 302 and the housing 50, on the one hand, the appearance quality of the battery cell 30 is affected, and on the other hand, the air layer at the bubble affects the heat dissipation of the housing 50 to the outside, which has an adverse effect on the overall heat dissipation of the battery cell 30. Therefore, the manufacturing method of the battery cell 30 of the embodiment of the present application is conducive to solving the above problems.

[0130] In some achievable methods, the insulating film 302 is heated by directly delivering a hot air flow to the insulating film 302 to soften the insulating film 302. The hot air flow is delivered to the surface of the insulating film 302 from the side of the insulating film 302 facing away from the battery cell 301. The method of heating the insulating film 302 with a hot air flow is conducive to uniform heat diffusion, thereby uniformly heating each area of ​​the insulating film 302 itself, ensuring good temperature consistency in each area of ​​the insulating film 302, and further ensuring good consistency in the lamination effect between the insulating film 302 and the housing 50. The method of heating the insulating film 302 with a hot air flow is a method of directly heating the insulating film 302, which is conducive to reducing heat loss and improving heating efficiency and heating effect.

[0131] In some examples, hot air is blown to deliver hot air flow to heat the insulating film 302. When the hot air is blown, the hot air can exert a force on the insulating film 302, so that the force exerted by the hot air on the insulating film 302 and the force exerted by the atmospheric pressure on the insulating film 302 can be superimposed on each other and act on the insulating film 302, which is conducive to further ensuring that the insulating film 302 and the housing 50 have a good fit and no bubbles are generated.

[0132] In some achievable ways, the carrier 121 is heated so that the carrier 121 heats the insulating film 302 to soften the insulating film 302. After the carrier 121 is heated, the carrier 121 can transfer the heat to the insulating film 302 and heat the insulating film 302. The carrier 121 itself can store heat. After heating the carrier 121 for a period of time, the heating can be stopped. The carrier 121 can heat the insulating film 302 by gradually releasing its own heat, so there is no need to continue to heat the carrier 121, which is conducive to reducing energy consumption.

[0133] After the insulating film 302 and the housing 50 are bonded together, the insulating film 302 may be cooled so that the insulating film 302 maintains the cylindrical structure after molding, ensuring that the insulating film 302 is not prone to rebound or warp and separate from the housing 50 .

[0134] In some achievable ways, Fig.10 The schematic diagram shows the partial structure of the lower housing 120 and the annular pressing frame 140 pressing the insulating film 302. Fig.10 As shown, the edge of the insulating film 302 is pressed against the carrier 121 by using the annular pressing frame 140 to effectively fix the position of the insulating film 302, and at the same time ensure that when the battery cell 301 presses down the insulating film 302, the edge of the insulating film 302 is not easily separated from the carrier 121. The insulating film 302 can seal the gap between the annular pressing frame 140 and the carrier 121 to prevent air leakage through the gap between the annular pressing frame 140 and the carrier 121.

[0135] After the insulating film 302 is attached to the outer surface of the housing 50, the annular pressing frame 140 is lifted to release the insulating film 302. After the annular pressing frame 140 is lifted, the insulating film 302 can be separated from the bearing portion 121, and no additional separation operation is required for the insulating film 302, which is conducive to simplifying the processing process and improving the processing efficiency.

[0136] In some examples, after the annular compression frame 140 releases the insulating film 302 and the insulating film 302 is separated from the supporting portion 121, external air can enter the first chamber 111 through the avoidance hole 121a, thereby breaking the vacuum state of the first chamber 111. Therefore, it is no longer necessary to input additional air into the first chamber 111 to break the vacuum state, which is conducive to simplifying the processing process and improving processing efficiency.

[0137] In some achievable ways, Fig.11 The partial structure of the insulating film coating device 100 is schematically shown. Fig.12 The process of manufacturing the battery cell 30 is schematically shown. Fig.11 and Fig.12As shown, the insulating film coating device 100 further includes a pressing assembly 150. Before the upper shell 110 and the lower shell 120 are butted and sealed, the pressing assembly 150 and the lifting and carrying assembly 130 clamp the battery cell 301. The pressing assembly 150 and the lifting and carrying assembly 130 drive the battery cell 301 to press the insulating film 302 downward.

[0138] After the battery cell 301 is placed in the area corresponding to the avoidance hole 121a on the insulating film 302, the lifting and lowering loading assembly 130 can lift the battery cell 301. Then the clamping assembly 150 moves from the top of the battery cell 301 to the battery cell 301, and finally contacts the battery cell 301, so that the clamping assembly 150 and the lifting and lowering loading assembly 130 clamp the battery cell 301 together. The end cover 40 of the battery cell 301 faces the clamping assembly 150. The clamping assembly 150 can be pressed against the end cover 40 of the battery cell 301. The bottom plate of the outer shell 50 of the battery cell 301 faces the lifting and lowering loading assembly 130. The clamping assembly 150 and the lifting and lowering loading assembly 130 can drive the battery cell 301 to descend, so that the battery cell 301 can complete the insulating film 302 wrapping action. After the insulating film 302 and the battery cell 301 are completed, the clamping assembly 150 and the lifting and lowering loading assembly 130 can drive the battery cell 301 to rise. When the battery core 301 rises to a position where it passes through the avoidance hole 121 a, it stops rising. The pressing assembly 150 releases the battery core 301, and then the battery core 301 covered with the insulating film 302 can be taken away.

[0139] The clamping assembly 150 and the lifting and loading assembly 130 can respectively clamp the battery cell 301 from the upper and lower directions of the battery cell 301 to effectively fix the position of the battery cell 301 and ensure the stability of the position of the battery cell 301. At the same time, the clamping assembly 150 and the lifting and loading assembly 130 can avoid the side panels of the outer shell 50, so that the clamping assembly 150 and the lifting and loading assembly 130 will not affect the fitting of the insulating film 302 with the side panels of the outer shell 50.

[0140] In some examples, Fig.13 The partial structure of the clamping assembly 150 is schematically shown. Fig.11 , Fig.12 and Fig.13 As shown, the pressing assembly 150 includes a pressing plate 151. The pressing plate 151 includes an escape recess 151a. The battery cell 301 includes an electrode terminal 41. The electrode terminal 41 is disposed on the end cover 40 and the electrode terminal 41 protrudes from the end cover 40. The pressing plate 151 presses against the end cover 40. The escape recess 151a accommodates the electrode terminal 41.

[0141] The avoidance recess 151a of the pressing plate 151 can effectively avoid the electrode terminal 41, so that the pressing plate 151 can apply downward pressure to the battery cell 301 through the end cover 40 without applying downward pressure to the electrode terminal 41, which is beneficial to reduce the possibility of structural damage caused by squeezing of the electrode terminal 41.

[0142] Exemplarily, the material of the pressing plate 151 may be a metal material, such as aluminum, aluminum alloy or steel.

[0143] In some achievable ways, after the upper shell 110 and the lower shell 120 are butt-sealed, the pressing assembly 150 is located in the first chamber 111 of the upper shell 110. The lower shell 120 has a second chamber 122. The avoidance hole 121a is connected to the second chamber 122. The lifting and loading assembly 130 is disposed in the second chamber 122.

[0144] The clamping assembly 150 will not interfere with the upper housing 110, ensuring smooth docking between the upper housing 110 and the lower housing 120. The upper housing 110 can protect the clamping assembly 150, reducing the possibility that the clamping assembly 150 is accidentally hit and the battery cell 301 is simultaneously displaced. The lower housing 120 can protect the lifting and carrying assembly 130, reducing the possibility that the lifting and carrying assembly 130 is accidentally hit and the battery cell 301 is simultaneously displaced.

[0145] In some practicable embodiments, after the insulating film 302 is attached to the outer surface of the housing 50 , the vacuum of the first chamber 111 is broken, and the portion of the insulating film 302 that extends beyond the end cover 40 is cut to obtain a battery cell 30 coated with the insulating film 302 .

[0146] After the insulating film 302 is attached to the outer surface of the housing 50, part of the insulating film 302 may extend beyond the end cap 40. In the case where part of the insulating film 302 extends beyond the end cap 40, the part of the insulating film 302 extending beyond the end cap 40 needs to be cut to make the insulating film 302 look neat.

[0147] In some examples, Fig.14 The local structure of the insulating film 302 is schematically shown in the state of being cut by an electric hot knife. Fig.14 As shown, the electric hot knife 300 is used to cut the portion of the insulating film 302 that exceeds the end cap 40. The electric hot knife 300 can relatively easily cut the insulating film 302, and can ensure that burrs are not easily generated at the cutting interface. After the insulating film 302 is attached to the outer surface of the housing 50, the electric hot knife 300 moves to a predetermined position and cuts the portion of the insulating film 302 that exceeds the end cap 40.

[0148] In some examples, the electric hot knife 300 includes a heating component 310 and a blade 320. The heating component 310 can heat the blade 320. The blade 320 with a higher temperature can cut the insulating film 302 relatively easily and can ensure that the cutting interface is not prone to burrs.

[0149] Fig.15Schematic diagram of the partial structure of a battery cell manufacturing facility. Fig.15 As shown, an embodiment of the present application provides a battery cell manufacturing device, which includes an insulating film coating device 100, a vacuum pumping device, a battery cell conveying device and an insulating film conveying device.

[0150] The insulating film coating device 100 includes an upper shell 110, a first lifting assembly 160, a lower shell 120 and a lifting and loading assembly 130. The upper shell 110 has a first chamber 111. The lower shell 120 includes a bearing portion 121. The bearing portion 121 includes an avoidance hole 121a. The bearing portion 121 has a bearing surface of the insulating film 302. The bearing surface of the insulating film 302 is arranged around the avoidance hole 121a. The upper shell 110 is connected to the first lifting assembly 160. The first lifting assembly 160 is used to drive the upper shell 110 to approach or move away from the lower shell 120 so that the upper shell 110 and the lower shell 120 are docked or separated. The lifting and loading assembly 130 is arranged corresponding to the avoidance hole 121a. The vacuum device is connected to the upper shell 110. The vacuum device is used to vacuum the first chamber 111 of the upper shell 110. The battery cell conveying device is used to convey the battery cell 301 to the insulating film coating device 100. The insulating film conveying device is used to convey the insulating film 302 to the insulating film coating device 100 .

[0151] The insulating film 302 conveyed by the insulating film conveying device to the insulating film coating device 100 can be connected to the bearing portion 121. The edge of the insulating film 302 can be connected to the bearing surface of the insulating film 302. The insulating film 302 can cover the avoidance hole 121a. The insulating film 302 and the bearing surface of the insulating film 302 are kept sealed. After the insulating film 302 is fixed, the battery cell 301 conveyed by the battery cell conveying device to the insulating film conveying device can be placed on the insulating film 302 above the lifting and loading assembly 130. The lifting and loading assembly 130 provides support for the battery cell 301 to keep the position of the battery cell 301 stable. The lifting and loading assembly 130 and the battery cell 301 are separated by the insulating film 302. The first lifting assembly 160 can drive the upper shell 110 to move close to the lower shell 120 to achieve the docking and sealing of the upper shell 110 and the lower shell 120. The vacuum device can evacuate the first chamber 111. The lifting and lowering loading assembly 130 is lowered, so that the battery cell 301 is lowered and the battery cell 301 can press down the insulating film 302. Since the first chamber 111 is in a negative pressure state, the atmospheric pressure can act on the surface of the insulating film 302 facing away from the battery cell 301, so that as the battery cell 301 is gradually pressed down, the insulating film 302 can be attached to the outer surface of the shell 50 under the action of the atmospheric pressure to gradually cover the outer surface of the shell 50, until the battery cell 301 is pressed down to a predetermined position, and the insulating film 302 covers the entire shell 50.

[0152] The battery cell manufacturing equipment of the embodiment of the present application can coat the battery cell 301 with the insulating film 302 by the cooperation of the insulating film coating device 100, the vacuum device, the battery cell conveying device and the insulating film conveying device. The battery cell manufacturing equipment of the embodiment of the present application can form an integral cylindrical structure directly on the outer shell 50 of the battery cell 301 by attaching a whole insulating film 302 to the outer shell 50 of the battery cell 301, so that the insulating film 302 coated on the battery cell 301 does not have an overlapping area, effectively avoiding the problem of the insulating film 302 warping, thereby reducing the possibility of local insulation failure caused by the warping of the insulating film 302. At the same time, the thickness of the insulating film 302 at each position is uniform, reducing the possibility of a decrease in the energy density of the battery cell 30 due to uneven thickness.

[0153] In some practicable embodiments, the first lifting assembly 160 may be, but is not limited to, a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0154] For some examples, see Fig.15 As shown, the lifting and lowering loading assembly 130 includes a loading plate 131 and a lifting component 132. The loading plate 131 is connected to the lifting component 132. The lifting component 132 can drive the loading plate 131 to rise or fall. The loading plate 131 is arranged corresponding to the avoidance hole 121a. The area of ​​the loading plate 131 can be smaller than the area of ​​the avoidance hole 121a. The loading plate 131 can provide support for the area on the insulating film 302 corresponding to the avoidance hole 121a.

[0155] Exemplarily, the lifting component 132 may be, but is not limited to, a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0156] In some possible implementations, see Fig.15 As shown, the insulating film coating device 100 also includes an annular sealing ring 200. The annular sealing ring 200 is provided on at least one of the upper shell 110 and the lower shell 120. After the upper shell 110 and the lower shell 120 are docked, the annular sealing ring 200 is used to seal the gap between the upper shell 110 and the lower shell 120 to avoid air leakage through the gap between the upper shell 110 and the lower shell 120, which is conducive to ensuring that the first chamber 111 is in a good negative pressure state. In some examples, the upper shell 110 is provided with an annular sealing ring 200.

[0157] In some achievable ways, Fig.16 The partial structure of the battery cell manufacturing equipment for conveying the battery cell 301 is schematically shown. Fig.16As shown, the battery cell conveying device may include a robot 400. The robot 400 is used to clamp the battery cell 301 and place the battery cell 301 above the lifting and lowering loading assembly 130. After the insulating film 302 lamination process is completed, the robot 400 can be used to clamp the battery cell 30 coated with the insulating film 302 to remove the battery cell 30 from the lifting and lowering loading assembly 130.

[0158] In some achievable ways, Fig.17 Schematic diagram of the partial structure of a battery cell manufacturing facility. Fig.17 As shown, the battery cell manufacturing equipment further includes a heating device 500. After the first chamber 111 is evacuated, the heating device 500 can heat the insulating film 302 to soften the insulating film 302. The softened insulating film 302 is then attached to the outer shell 50 of the battery cell 301.

[0159] After being heated, the insulating film 302 becomes softer and is more easily stretched and deformed when pressed by the battery cell 301, thereby reducing the possibility of tearing and damage of the insulating film 302 due to the tensile force. In addition, the further softened insulating film 302 is relatively easier to match and conform to the outer surface of the shell 50, thereby ensuring that the insulating film 302 and the shell 50 fit well, making it difficult for bubbles to form between the insulating film 302 and the shell 50. In the case where the shell 50 has a pit, the soft insulating film 302 can also easily match and conform, so that the area of ​​the insulating film 302 corresponding to the pit of the shell 50 also forms a corresponding recess, making it difficult for bubbles to form between the insulating film 302 and the shell 50.

[0160] If bubbles are generated between the insulating film 302 and the outer shell 50, on the one hand, the appearance quality of the battery cell 30 is affected, and on the other hand, the air layer at the bubble affects the heat dissipation of the outer shell 50 to the outside, which has an adverse effect on the overall heat dissipation of the battery cell 30. Therefore, the embodiment of the present application heats the insulating film 302 by the heating device 500 and then adheres it, which is conducive to solving the above problems.

[0161] In some achievable embodiments, the heating device 500 includes a hot air flow outlet, and the hot air flow outlet of the heating device 500 is arranged corresponding to the avoidance hole 121 a of the lower housing 120 .

[0162] After the insulating film 302 is connected to the bearing portion 121, the insulating film 302 covers the avoidance hole 121a. Therefore, the hot air flow discharged from the hot air flow outlet of the heating device 500 can pass through the avoidance hole 121a and directly heat the insulating film 302 to soften the insulating film 302. The heating device 500 transports the hot air flow to the surface of the insulating film 302 from the side of the insulating film 302 facing away from the battery cell 301. The method of heating the insulating film 302 with hot air flow is conducive to uniform heat diffusion, so that each area of ​​the insulating film 302 itself is heated evenly, ensuring good temperature consistency in each area of ​​the insulating film 302, which is conducive to ensuring good consistency in the fitting effect between the insulating film 302 and the shell 50.

[0163] In some examples, the heating device 500 includes a heater and a hair dryer. The hair dryer includes a hot air flow outlet. The insulating film 302 is heated by blowing hot air from the hair dryer. When blowing hot air, the hot air can exert a force on the insulating film 302, so that the force exerted by the hot air on the insulating film 302 and the force exerted by the atmospheric pressure on the insulating film 302 can be superimposed on each other and act on the insulating film 302, which is conducive to further ensuring that the insulating film 302 and the housing 50 have a good fit and no bubbles are generated. Exemplarily, the heater can include a resistance wire or a resistance sheet.

[0164] In some achievable embodiments, the battery cell manufacturing equipment further includes a heating device 500. The heating device 500 is used to heat the carrier 121. By heating the carrier 121, the carrier 121 heats the insulating film 302 to soften the insulating film 302. After the carrier 121 is heated, the carrier 121 can then transfer the heat to the insulating film 302 and heat the insulating film 302. The carrier 121 itself can accumulate heat. After heating the carrier 121 for a period of time, the heating can be stopped. The carrier 121 can heat the insulating film 302 by gradually releasing its own heat, so there is no need to continuously heat the carrier 121, which is beneficial to reducing energy consumption.

[0165] In some examples, the heating device 500 is disposed on the lower housing 120. The heating device 500 is disposed close to the bearing portion 121. Exemplarily, the heating device 500 may include a resistance wire or a resistance sheet.

[0166] In some possible implementations, see Fig.17 As shown, the insulating film coating device 100 includes an annular pressing frame 140 and a second lifting assembly 170. The annular pressing frame 140 is connected to the second lifting assembly 170. The annular pressing frame 140 is arranged corresponding to the bearing surface of the insulating film 302. The second lifting assembly 170 is used to drive the annular pressing frame 140 to approach or move away from the bearing surface of the insulating film 302.

[0167] After the edge of the insulating film 302 is aligned and placed on the bearing surface of the insulating film 302, the second lifting assembly 170 drives the annular clamping frame 140 to move close to the bearing surface of the insulating film 302, so that the annular clamping frame 140 presses the edge of the insulating film 302. The method of using the annular clamping frame 140 to crimp the edge of the insulating film 302 on the bearing portion 121 can effectively fix the position of the insulating film 302, and at the same time ensure that when the battery cell 301 presses down the insulating film 302, the edge of the insulating film 302 is not easily separated from the bearing portion 121. After the insulating film 302 is completely attached to the outer surface of the shell 50, the annular clamping frame 140 is lifted to release the insulating film 302. After the annular clamping frame 140 is lifted, the insulating film 302 can be separated from the bearing portion 121, and there is no need to perform additional separation operations on the insulating film 302, which is conducive to simplifying the processing steps and improving processing efficiency.

[0168] In some examples, the second lifting assembly 170 may be connected to the upper housing 110. The second lifting assembly 170 may be located in the first chamber 111. The second lifting assembly 170 may include a pneumatic cylinder, a hydraulic cylinder, or a pneumatic cylinder.

[0169] In some possible implementations, see Fig.17 As shown, the insulating film coating device 100 further includes a clamping assembly 150. The clamping assembly 150 is arranged corresponding to the lifting and carrying assembly 130. The clamping assembly 150 and the lifting and carrying assembly 130 are used to clamp the battery cell 301. The clamping assembly 150 and the lifting and carrying assembly 130 are used to drive the battery cell 301 to press down the insulating film 302.

[0170] After the battery cell 301 is placed in the area corresponding to the avoidance hole 121a on the insulating film 302, the lifting and lowering loading assembly 130 can lift the battery cell 301. Then the clamping assembly 150 moves from above the battery cell 301 to the battery cell 301, and finally contacts the battery cell 301, so that before the upper shell 110 and the lower shell 120 are docked and sealed, the clamping assembly 150 and the lifting and lowering loading assembly 130 can clamp the battery cell 301 together. The end cover 40 of the battery cell 301 faces the clamping assembly 150. The clamping assembly 150 can be pressed against the end cover 40 of the battery cell 301. The bottom plate of the outer shell 50 of the battery cell 301 faces the lifting and lowering loading assembly 130. After the upper shell 110 and the lower shell 120 are docked and sealed, the clamping assembly 150 and the lifting and lowering loading assembly 130 can drive the battery cell 301 to descend, so that the battery cell 301 can complete the insulating film 302 wrapping action. After the insulating film 302 and the battery cell 301 are attached, the pressing assembly 150 and the lifting and loading assembly 130 can drive the battery cell 301 to rise. When the battery cell 301 rises to a position where it passes through the avoidance hole 121a, it stops rising. The pressing assembly 150 releases the battery cell 301, and then the battery cell 301 covered with the insulating film 302 can be taken away.

[0171] The clamping assembly 150 and the lifting and loading assembly 130 can respectively clamp the battery cell 301 from the upper and lower directions of the battery cell 301 to effectively fix the position of the battery cell 301 and ensure the stability of the position of the battery cell 301. At the same time, the clamping assembly 150 and the lifting and loading assembly 130 can avoid the side panels of the outer shell 50, so that the clamping assembly 150 and the lifting and loading assembly 130 will not affect the fitting of the insulating film 302 with the side panels of the outer shell 50.

[0172] In some examples, the clamping assembly 150 may be connected to the upper housing 110. The clamping assembly 150 is disposed corresponding to the first chamber 111. At least a portion of the clamping assembly 150 is located in the first chamber 111. When the upper housing 110 and the lower housing 120 are butt-sealed, the clamping assembly 150 is located in the first chamber 111.

[0173] For some examples, see Fig.17 As shown, the pressing assembly 150 includes a pressing plate 151 and a lifting mechanism 152. The pressing plate 151 is connected to the lifting mechanism 152. The lifting mechanism 152 is used to drive the pressing plate 151 to move closer to or away from the lifting object loading assembly 130. The pressing plate 151 includes an avoidance recess 151a (see Fig.13 The opening of the avoidance recess 151a faces the lifting and lowering loading assembly 130. The avoidance recess 151a is used to accommodate the electrode terminal 41 of the battery cell 301.

[0174] The avoidance recess 151a of the pressing plate 151 can effectively avoid the electrode terminal 41, so that the pressing plate 151 can apply downward pressure to the battery cell 301 through the end cover 40 without applying downward pressure to the electrode terminal 41, which is beneficial to reduce the possibility of structural damage caused by squeezing of the electrode terminal 41.

[0175] Exemplarily, the material of the pressing plate 151 may be a metal material, such as aluminum, aluminum alloy or steel.

[0176] Exemplarily, the lifting mechanism 152 may be connected to the upper housing 110. The lifting mechanism 152 may include a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0177] In some achievable embodiments, the pressing assembly 150 is connected to the upper housing 110 . The lower housing 120 has a second chamber 122 . The avoidance hole 121 a is connected to the second chamber 122 . The lifting and carrying assembly 130 is disposed in the second chamber 122 .

[0178] After the upper shell 110 and the lower shell 120 are docked and sealed, the clamping assembly 150 is located in the first chamber 111 of the upper shell 110. The clamping assembly 150 will not interfere with the position of the upper shell 110, ensuring a smooth docking process between the upper shell 110 and the lower shell 120. The upper shell 110 can protect the clamping assembly 150, reducing the possibility that the clamping assembly 150 is accidentally collided with and causes the battery cell 301 to shift in position at the same time. The lower shell 120 can protect the lifting and loading assembly 130, reducing the possibility that the lifting and loading assembly 130 is accidentally collided with and causes the battery cell 301 to shift in position at the same time.

[0179] In some achievable embodiments, the battery cell manufacturing equipment further includes an electric hot knife 300 (see Fig.14 ). After the insulating film 302 is attached to the outer surface of the housing 50, the electric hot knife 300 can be moved to the insulating film 302 and contact the insulating film 302. The electric hot knife 300 is used to cut the portion of the insulating film 302 that exceeds the end cover 40 to obtain the battery cell 30 coated with the insulating film 302. The electric hot knife 300 can cut the insulating film 302 relatively easily and can ensure that burrs are not easily generated at the cutting interface.

[0180] In some examples, the electric hot knife 300 includes a heating component 310 and a blade 320. The heating component 310 can heat the blade 320. The blade 320 with a higher temperature can cut the insulating film 302 relatively easily and can ensure that the cutting interface is not prone to burrs.

[0181] The embodiment of the present application provides an insulating film coating device 100 for use in battery cell manufacturing equipment. The insulating film coating device 100 includes an upper shell 110, a first lifting assembly 160, a lower shell 120 and a lifting and loading assembly 130. Among them, the upper shell 110 has a first chamber 111. The lower shell 120 includes a bearing portion 121. The bearing portion 121 includes an avoidance hole 121a. The bearing portion 121 has a bearing surface of the insulating film 302. The bearing surface of the insulating film 302 is arranged around the avoidance hole 121a. The upper shell 110 is connected to the first lifting assembly 160. The first lifting assembly 160 is used to drive the upper shell 110 to approach or move away from the lower shell 120 so that the upper shell 110 and the lower shell 120 can be docked or separated. The lifting and loading assembly 130 is arranged corresponding to the avoidance hole 121a.

[0182] According to some embodiments of the present application, the present application further provides a battery device 10, including a battery cell 30 manufactured by a battery cell 30 manufacturing method or a battery cell manufacturing device.

[0183] According to some embodiments of the present application, the present application further provides an electric device, including the battery device 10 of any of the above solutions, and the battery device 10 is used to provide electric energy to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery device 10.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for manufacturing a battery cell, characterized in that: include: An insulating film covering device is provided, the insulating film covering device comprising an upper shell, a lower shell and a lifting and loading assembly, the upper shell having a first chamber, the lower shell comprising a bearing portion, the bearing portion comprising an avoidance hole, the bearing portion having an insulating film bearing surface, the insulating film bearing surface being arranged around the avoidance hole, and the lifting and loading assembly being arranged corresponding to the avoidance hole; Providing an insulating film, connecting the insulating film to the insulating film bearing surface of the bearing portion, the insulating film covering the avoidance hole, and the lifting and loading assembly being located below the insulating film; Providing a battery cell, the battery cell comprising a shell and an end cover, placing the battery cell on the insulating film, the shell being in contact with the insulating film, the battery cell being arranged corresponding to the avoidance hole, and the lifting and loading assembly lifting the battery cell; The upper shell and the lower shell are butt-jointed and sealed, the battery cell is located in the first chamber, and the first chamber is evacuated; The lifting and loading assembly drives the battery cell to descend, the housing presses down the insulating film, the battery cell passes through the avoidance hole, and the insulating film adheres to the outer surface of the housing under the action of atmospheric pressure; After the insulating film is bonded to the outer surface of the housing, the first chamber is vacuum-broken to obtain the battery cell covered with the insulating film.

2. The method for manufacturing a battery cell according to claim 1, characterized in that: After the first chamber is evacuated, the insulating film is heated to soften the insulating film.

3. The method for manufacturing a battery cell according to claim 2, characterized in that: The insulating film is heated by directly delivering a hot gas flow to the insulating film; or, the carrying part is heated so that the carrying part heats the insulating film.

4. The method for manufacturing a battery cell according to claim 1, characterized in that: An annular pressing frame is used to press the edge of the insulating film onto the bearing portion. After the insulating film is attached to the outer surface of the housing, the annular pressing frame is lifted to release the insulating film.

5. The method for manufacturing a battery cell according to claim 1, characterized in that: The insulating film covering device also includes a clamping assembly. Before the upper shell and the lower shell are butt-jointed and sealed, the clamping assembly and the lifting and lowering assembly clamp the battery cell, and the clamping assembly and the lifting and lowering assembly drive the battery cell to press down the insulating film.

6. The method for manufacturing a battery cell according to claim 5, characterized in that: The clamping assembly includes a pressing plate, the pressing plate includes an avoidance recess, the battery cell includes an electrode terminal, the electrode terminal is arranged on the end cover and the electrode terminal protrudes from the end cover, the pressing plate is pressed against the end cover, and the avoidance recess accommodates the electrode terminal.

7. The method for manufacturing a battery cell according to claim 5, characterized in that: After the upper shell and the lower shell are butt-jointed and sealed, the clamping assembly is located in the first chamber, the lower shell has a second chamber, the avoidance hole is connected to the second chamber, and the lifting and loading assembly is arranged in the second chamber.

8. The method for manufacturing a battery cell according to claim 1, characterized in that: After the insulating film is attached to the outer surface of the housing, the first chamber is vacuumed, and the portion of the insulating film that exceeds the end cover is cut to obtain the battery cell covered with the insulating film.

9. The method for manufacturing a battery cell according to claim 8, characterized in that: The portion of the insulating film that exceeds the end cover is cut using an electric hot knife.

10. A battery cell manufacturing device, characterized in that: include: An insulating film covering device comprises an upper shell, a first lifting assembly, a lower shell and a lifting and loading assembly, wherein the upper shell has a first chamber, the lower shell comprises a bearing portion, the bearing portion comprises a avoidance hole, the bearing portion has an insulating film bearing surface, the insulating film bearing surface is arranged around the avoidance hole, the upper shell is connected to the first lifting assembly, the first lifting assembly is used to drive the upper shell to approach or move away from the lower shell so that the upper shell and the lower shell are docked or separated, and the lifting and loading assembly is arranged corresponding to the avoidance hole; A vacuum pumping device connected to the upper shell, the vacuum pumping device is used to vacuum the first chamber of the upper shell; A battery cell conveying device, used for conveying the battery cell to the insulating film coating device; The insulating film conveying device is used to convey the insulating film to the insulating film coating device.

11. The battery cell manufacturing equipment according to claim 10, characterized in that: The battery cell manufacturing equipment further includes a heating device, the heating device includes a hot air flow outlet, and the hot air flow outlet is arranged corresponding to the avoidance hole; or the heating device is used to heat the bearing part.

12. The battery cell manufacturing equipment according to claim 10, characterized in that: The insulating film coating device includes an annular pressing frame and a second lifting assembly, wherein the annular pressing frame is connected to the second lifting assembly, the annular pressing frame is arranged corresponding to the insulating film bearing surface, and the second lifting assembly is used to drive the annular pressing frame to approach or move away from the insulating film bearing surface.

13. The battery cell manufacturing equipment according to claim 10, characterized in that: The insulating film coating device also includes a clamping assembly, which is arranged corresponding to the lifting and loading assembly. The clamping assembly and the lifting and loading assembly are used to clamp the battery cell, and the clamping assembly and the lifting and loading assembly are used to drive the battery cell to press down the insulating film.

14. The battery cell manufacturing equipment according to claim 13, characterized in that: The clamping assembly includes a pressing plate and a lifting mechanism, wherein the pressing plate is connected to the lifting mechanism, and the lifting mechanism is used to drive the pressing plate to approach or move away from the lifting and loading assembly. The pressing plate includes an avoidance recess, and the opening of the avoidance recess faces the lifting and loading assembly.

15. The battery cell manufacturing equipment according to claim 13, characterized in that: The clamping assembly is connected to the upper shell, the lower shell has a second chamber, the avoidance hole is connected to the second chamber, and the lifting and loading assembly is arranged in the second chamber.

16. The battery cell manufacturing equipment according to claim 10, characterized in that: The battery cell manufacturing equipment further includes an electric heating knife, which is used for cutting the insulating film.

17. A battery device, characterized in that: The invention comprises a battery cell manufactured by the battery cell manufacturing method according to any one of claims 1 to 9.

18. An electrical device, characterized in that: Comprising the battery device as claimed in claim 17.

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