Electric device, solid-state battery and manufacturing method thereof

Abstract

The present application discloses an electrical device, a solid-state battery and a manufacturing method thereof. The manufacturing method of the solid-state battery includes: placing an electrode assembly between two stacked packaging films; hot pressing partial areas of the two packaging films to form a packaging area and an unpackaged area arranged along the periphery of the electrode assembly. In the packaging area, the two packaging films are connected, and in the unpackaged area, the two packaging films are not connected; the two packaging films and the electrode assembly are placed in a sealed cavity, and the sealed cavity is evacuated; the unpackaged area is hot pressed to form a sealed inner cavity between the two packaging films, wherein the electrode assembly is arranged in the inner cavity. The solid-state battery manufacturing method provided in the present application can improve the flatness of the plastic film packaging to improve the service life and chemical properties of the solid-state battery.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an electrical device, a solid-state battery and a method for manufacturing the same. Background Art

[0002] Solid-state batteries are batteries that use solid materials as electrolytes. Solid-state batteries have high charging efficiency, high energy density, and low risk of explosion, and are of high research value.

[0003] In the production process of solid-state batteries, including sealing the plastic film, how to improve the flatness of the plastic film package and improve the service life and chemical properties of solid-state batteries is one of the research issues in this field. Summary of the invention

[0004] In view of the above problems, the present application provides an electrical device, a solid-state battery and a manufacturing method thereof, which can improve the flatness of the plastic film package to improve the service life and chemical properties of the solid-state battery.

[0005] In the first aspect, the present application provides a method for manufacturing a solid-state battery, comprising: placing an electrode assembly between two stacked packaging films; hot pressing partial areas of the two packaging films to form a packaging area and an unpackaged area arranged along the periphery of the electrode assembly. In the packaging area, the two packaging films are connected, and in the unpackaged area, the two packaging films are not connected; placing the two packaging films and the electrode assembly in a sealed cavity, and evacuating the sealed cavity; hot pressing the unpackaged area to form a sealed inner cavity between the two packaging films, wherein the electrode assembly is arranged in the inner cavity.

[0006] In the technical solution of the embodiment of the present application, two packaging films are stacked, which can facilitate hot pressing and welding of the packaging films, thereby improving the connection efficiency of subsequent packaging films. The packaging area and the unpackaged area jointly enclose the electrode assembly to form an inner cavity for accommodating the electrode assembly. In particular, the packaging area is connected outside the sealed cavity, and then the sealed cavity is evacuated to discharge the air in the inner cavity, and then the unpackaged area is hot pressed, which can improve the vacuum degree in the inner cavity. In addition, the above method can reduce the risk of wrinkles at the connection of the packaging film, improve the flatness of the plastic film package, and thus improve the performance of the solid-state battery.

[0007] In some embodiments, the step of hot pressing partial areas of two packaging films to form a packaging area and an unpackaged area arranged along the periphery of the electrode assembly includes: hot pressing the two packaging films to form a first packaging area extending along a first direction; hot pressing the two packaging films to form a second packaging area extending along the first direction; hot pressing the two packaging films to form a third packaging area extending along the second direction; hot pressing the two packaging films to form a fourth packaging area extending along the second direction. The first direction is perpendicular to the second direction, and the first packaging area and the second packaging area are respectively located on both sides of the electrode assembly along the second direction. The third packaging area and the fourth packaging area are respectively located on both sides of the electrode assembly along the first direction. An unpackaged area is left between the first packaging area and the third packaging area.

[0008] In the above technical solution, by setting the first packaging area and the second packaging area to extend along the first direction, the third packaging area and the fourth packaging area are respectively perpendicular to the first packaging area, and the four packaging areas form a non-enclosed rectangular structure. The above structure matches the shape of the electrode assembly and can surround most of the electrode assembly to improve the sealing performance of the package. Furthermore, there is a gap between the first packaging area and the third packaging area to form an unpackaged area, which is convenient for vacuuming the inner cavity and reducing the risk of wrinkles during heating and pressurization.

[0009] In some embodiments, an unpackaged area is left between the second packaged area and the third packaged area. And / or, an unpackaged area is left between the second packaged area and the fourth packaged area. In the above technical solution, increasing the number of unpackaged areas can improve the efficiency of vacuuming the inner cavity and improve the sealing performance of the inner cavity.

[0010] In some embodiments, two ends of the second packaging area along the first direction are connected to the third packaging area and the fourth packaging area respectively. In the above structure, the second packaging area overlaps with the third packaging area and the fourth packaging area, reducing the risk of air leakage between the second packaging area and the third packaging area and the fourth packaging area, improving the sealing of the inner cavity, and improving the stability of the solid-state battery operation.

[0011] In some embodiments, one end of the first packaging area along the first direction is connected to the fourth packaging area. The above structure reduces the risk of leakage between the first packaging area and the fourth packaging area, improves the sealing of the inner cavity, and improves the stability of the solid-state battery operation.

[0012] In some embodiments, the step of hot pressing partial areas of two packaging films to form a packaging area and an unpackaged area arranged along the periphery of the electrode assembly includes: hot pressing the two packaging films to form a first packaging area extending along a first direction; hot pressing the two packaging films to form a second packaging area extending along the first direction; hot pressing the two packaging films to form a third packaging area extending along the second direction. The first direction is perpendicular to the second direction. The first packaging area and the second packaging area are respectively located on both sides of the electrode assembly along the second direction, and the third packaging area is located on one side of the electrode assembly along the first direction. Both ends of the third packaging area are connected to the first packaging area and the second packaging area, respectively.

[0013] In the above technical solution, the three sides of the electrode assembly are surrounded by setting the first packaging area, the second packaging area and the third packaging area, and one side is reserved for non-packaging, so as to facilitate vacuuming in the sealed cavity. After vacuuming, the reserved side can be packaged at one time. The above structure can reduce the number of times the packaging film is heated and pressurized, and improve the efficiency of packaging. In addition, the number of connection points between the packaging areas can be reduced, and the sealing of the solid-state battery can be improved.

[0014] In some embodiments, the step of hot pressing partial areas of the two packaging films to form a packaging area and an unpackaged area arranged along the periphery of the electrode assembly also includes hot pressing the two packaging films to form a fourth packaging area and a fifth packaging area extending along the second direction. The fourth packaging area is connected to the first packaging area, the fifth packaging area is connected to the second packaging area, and an unpackaged area is formed between the fourth packaging area and the fifth packaging area. In the above technical solution, by setting the fourth packaging area and the fifth packaging area, an unpackaged area is set in the middle of the side of the electrode assembly, which can facilitate the operation of hot pressing and vacuuming the unpackaged area, thereby improving the convenience of operation.

[0015] In some embodiments, the step of placing the electrode assembly between two stacked packaging films includes: providing a packaging film; placing the electrode assembly on the packaging film; folding the packaging film in half so that the packaging film forms two stacked packaging films, and the electrode assembly is located between the two packaging films. In the above structure, using a folded film instead of two stacked films can reduce the number of operating steps in the packaging process and improve packaging efficiency. Compared with stacking two films, the folded method is easier to achieve fast and accurate packaging on an automated production line, thereby improving packaging efficiency.

[0016] In a second aspect, the present application provides a solid-state battery, which is manufactured using the solid-state battery manufacturing method as described in the above embodiment.

[0017] In a third aspect, the present application provides an electrical device, which includes the solid-state battery in the above embodiment, and the solid-state battery is used to provide electrical energy.

[0018] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0022] Figure 3 A schematic diagram of the structure of a solid-state battery provided in some embodiments of the present application;

[0023] Figure 4 A flow chart of a method for manufacturing a solid-state battery provided in some embodiments of the present application;

[0024] Figure 5 A schematic diagram of the structure of a solid-state battery during the manufacturing process provided by some embodiments of the present application;

[0025] Figure 6 A schematic diagram of the structure of a solid-state battery during the manufacturing process provided in some other embodiments of the present application;

[0026] Figure 7 A schematic diagram of the structure of a solid-state battery during the manufacturing process provided by some other embodiments of the present application;

[0027] Figure 8 A flow chart of a method for manufacturing a solid-state battery provided for other embodiments of the present application;

[0028] Fig. 9 A schematic diagram of the structure of a solid-state battery during the manufacturing process provided in some embodiments of the present application;

[0029] Fig.10 A flow chart of a method for manufacturing a solid-state battery provided in some other embodiments of the present application;

[0030] Fig.11 A schematic diagram of the structure of a solid-state battery during the manufacturing process provided in some embodiments of the present application;

[0031] Fig.12 A flow chart of a method for manufacturing a solid-state battery provided in some further embodiments of the present application.

[0032] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0033] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Box; 51. First box part; 52. Second box part; 53. Accommodation space; X, first direction; Y, second direction; 7. Battery cell; 701, first packaging area; 702, second packaging area; 703, third packaging area; 704, fourth packaging area; 705, unpackaged area; 706, fifth packaging area; 10. Electrode assembly; 20. Casing. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are 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.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship 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.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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.

[0041] 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 those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] Solid-state batteries refer to batteries that use solid substances as electrolytes. Solid-state batteries usually include a packaging shell and an electrode assembly disposed in the packaging shell. The installation process of the packaging shell usually involves stacking two packaging films and then placing them in a vacuum environment for packaging. The packaging film is heated and pressurized around the periphery of the electrode assembly so that the two packaging films are hot-melt connected to form an internally sealed cavity to encapsulate the electrode assembly. Since there is no liquid substance in the solid-state battery, the packaging film is prone to uneven wrinkles at the joints during the hot-melt connection process. The presence of wrinkles will reduce the sealing of the package and reduce the stability of the solid-state battery operation.

[0045] Based on the above problems, an embodiment of the present application provides a method for manufacturing a solid-state battery, which can facilitate hot pressing and welding of the packaging films by stacking two packaging films, thereby improving the connection efficiency of subsequent packaging films. The packaging area and the unpackaged area jointly enclose the electrode assembly to form an inner cavity for accommodating the electrode assembly. In particular, the packaging area is connected outside the sealed cavity, and then the sealed cavity is evacuated to discharge the air in the inner cavity, and then the unpackaged area is hot pressed, which can improve the vacuum degree in the inner cavity. In addition, the above method can reduce the risk of wrinkles at the connection of the packaging film, improve the flatness of the plastic film package, and thus improve the performance of the solid-state battery.

[0046] The battery device of the present application is described in detail below.

[0047] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0048] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0049] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0050] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0051] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] Battery cells may include, but are not limited to, solid-state batteries, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0054] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present application.

[0055] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0056] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0057] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0058] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0059] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0060] like Figure 1 As shown, a battery device 2 is disposed inside the vehicle 1, and the battery device 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1.

[0061] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating and driving the vehicle 1 .

[0062] In some embodiments of the present application, the battery device 2 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, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0063] Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0064] The box body 5 is used to accommodate the battery cell 7, and the box body 5 can be a variety of structures. In some embodiments, the box body 5 can include a first box body part 51 and a second box body part 52, the first box body part 51 and the second box body part 52 cover each other, and the first box body part 51 and the second box body part 52 jointly define a storage space 53 for accommodating the battery cell. The second box body part 52 can be a hollow structure with one end open, the first box body part 51 is a plate-like structure, and the first box body part 51 covers the open side of the second box body part 52 to form a box body 5 with a storage space 53; the first box body part 51 and the second box body part 52 can also be a hollow structure with one side open, and the open side of the first box body part 51 covers the open side of the second box body part 52 to form a box body 5 with a storage space 53. Of course, the first box body part 51 and the second box body part 52 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0065] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0066] Assuming that the first box body portion 51 covers the top of the second box body portion 52 , the first box body portion 51 can also be referred to as an upper box cover, and the second box body portion 52 can also be referred to as a lower box body.

[0067] In the battery device 2, the battery cell 7 can be one or more. If there are more than one battery cell 7, the battery cells 7 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 7 are both connected in series and in parallel. The battery cells 7 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 7 can be accommodated in the box 5; of course, the battery cells can also be connected in series, in parallel or in mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in mixed connection to form a whole, and then accommodated in the box 5.

[0068] In some optional embodiments, the battery cells 7 may also be directly accommodated in the box body 5 to reduce the connecting components or supporting components required to form the battery module and improve the energy density of the battery device 2 .

[0069] For example, the battery cell 7 may be the smallest unit constituting the battery device 2 .

[0070] The battery cell 7 is a solid-state battery, which generally includes: a housing 20 and an electrode assembly 10. The housing has an inner cavity, and the electrode assembly is arranged in the inner cavity. The electrode assembly includes a positive electrode sheet and a negative electrode sheet that are stacked. Among them, a solid electrolyte is arranged on the electrode sheet.

[0071] In some optional embodiments, the solid electrolyte includes one or more of a sulfide solid electrolyte, an oxide solid electrolyte, a halide solid electrolyte, and a polymer solid electrolyte.

[0072] Sulfide solid electrolytes include sulfide crystalline solid electrolytes, sulfide glass and glass ceramic solid electrolytes.

[0073] Please refer to Figures 3 to 5 , Figure 3 A schematic diagram of the structure of a solid-state battery provided in some embodiments of the present application, Figure 4 A flowchart of a method for manufacturing a solid-state battery provided in some embodiments of the present application, Figure 5 A schematic diagram of the structure during the manufacturing process of a solid-state battery provided in some embodiments of the present application.

[0074] As shown in the figure, the manufacturing method of solid-state batteries includes:

[0075] S1, placing the electrode assembly 10 between two stacked packaging films;

[0076] S2, hot pressing partial areas of the two packaging films to form a packaging area and an unpackaging area 705 arranged along the periphery of the electrode assembly 10. In the packaging area, the two packaging films are connected, and in the unpackaging area 705, the two packaging films are not connected;

[0077] S3, placing two packaging films and the electrode assembly 10 in a sealed cavity, and evacuating the sealed cavity;

[0078] S4. Hot pressing the unpackaged area 705 to form a sealed inner cavity between the two packaging films, wherein the electrode assembly 10 is disposed in the inner cavity.

[0079] It can be understood that the above steps are mainly packaging steps for solid-state batteries.

[0080] Before step S1, the method further includes stacking and connecting the positive electrode sheets and the negative electrode sheets to form an electrode assembly 10. After step S4, the method further includes performing sealing tests, capacity separation tests, and other steps on the packaged solid-state battery.

[0081] In step S1, the packaging film can be an aluminum plastic film or a steel plastic film. The electrode assembly 10 refers to a fixed structure formed by connecting a plurality of electrode plates. A receiving groove can also be provided on the packaging film, and the shape of the receiving groove matches the electrode assembly 10, so as to facilitate the positioning and assembly of the electrode assembly 10 and improve the assembly efficiency.

[0082] In step S2, hot-melt materials are usually provided on the opposite surfaces of the two stacked packaging films, which can be melted and fused together under a certain temperature and pressure, and are firmly connected after cooling to form a packaging area. The packaging film in the unpackaged area 705 is not heated or pressurized to ensure that there is a certain gap between the two plastic films, so that the inner cavity of the housing 20 is connected to the outside, which is convenient for subsequent vacuuming.

[0083] In step S3, the sealed cavity is evacuated and a certain pressure is maintained to ensure the internal vacuum degree. The internal pressure of the sealed cavity can be detected by a pressure instrument to improve the sealing performance of the interior of the housing 20.

[0084] In step S4, the unpackaged area 705 may be hot-pressed in the sealed cavity to improve the sealing performance of the inner cavity.

[0085] In the technical solution of the embodiment of the present application, two packaging films are stacked together to provide a stable substrate for the subsequent packaging process. This stacking method not only enhances the strength of the package, but also makes the hot pressing and welding process more uniform and firm. High temperature and pressure are used to melt and tightly bond the packaging films to form a reliable sealing layer. This method can complete the packaging quickly and efficiently while reducing material waste and processing time. By first evacuating the vacuum and then hot pressing, the vacuum degree of the inner cavity can be increased, providing a more stable working environment for the solid-state battery cell 7. The combination of stacking and hot pressing reduces the risk of wrinkles at the joints of the packaging films and improves the flatness of the package. High vacuum and good packaging flatness together improve the performance of solid-state batteries, including energy density, cycle stability and cycle life.

[0086] like Figure 5 As shown, in some embodiments of the present application, step S2 includes:

[0087] S2A, hot pressing the two packaging films to form a first packaging area 701 extending along the first direction X;

[0088] S2B, hot pressing the two packaging films to form a second packaging area 702 extending along the first direction X; hot pressing the two packaging films to form a third packaging area 703 extending along the second direction Y;

[0089] S2C. The two packaging films are hot-pressed to form a fourth packaging area 704 extending along the second direction Y.

[0090] The first direction X is perpendicular to the second direction Y, and the first packaging area 701 and the second packaging area 702 are respectively located on both sides of the electrode assembly 10 along the second direction Y. The third packaging area 703 and the fourth packaging area 704 are respectively located on both sides of the electrode assembly 10 along the first direction X. An unpackaged area 705 is left between the first packaging area 701 and the third packaging area 703.

[0091] The first direction X may be the length direction of the electrode assembly 10, and the second direction Y may be the width direction of the electrode assembly 10. Alternatively, the first direction X may be the width direction of the electrode assembly 10, and the second direction Y may be the length direction of the electrode assembly 10. Such a configuration can better fit the packaging film to the electrode assembly 10, thereby improving the sealing performance of the inner cavity.

[0092] The first encapsulation area 701 and the second encapsulation area 702 may be strip-shaped areas extending along the first direction X. The first encapsulation area 701 and the second encapsulation area 702 are arranged at intervals along the second direction Y. The third encapsulation area 703 and the fourth encapsulation area 704 may be strip-shaped structures extending along the second direction Y. The third encapsulation area 703 and the fourth encapsulation area 704 are arranged at intervals along the second direction Y.

[0093] In the above technical solution, the first packaging area 701 and the second packaging area 702 are arranged to extend along the first direction X, and form a non-enclosed rectangular structure with the third packaging area 703 and the fourth packaging area 704 (which are respectively perpendicular to the first packaging area 701). This layout closely matches the shape of the electrode assembly 10. This rectangular surrounding structure not only simplifies the packaging process, but also ensures that the electrode assembly 10 is completely and evenly surrounded, thereby improving the sealing performance of the packaging.

[0094] In addition, the gap left between the first packaging area 701 and the third packaging area 703 forms an unpackaged area 705, which reduces unnecessary operating steps and time waste. During the packaging process, the inner cavity is evacuated through the unpackaged area 705, so that the air in the inner cavity can be more efficiently removed, providing a high vacuum environment for subsequent hot pressing and welding. During the heating and pressurizing process, due to the presence of the unpackaged area 705, the packaging film can stretch and shrink more freely, thereby reducing the risk of wrinkles during the hot pressing process. This design helps to maintain the flatness of the packaging film and improve the overall quality of the package. High vacuum and good sealing performance work together inside the solid-state battery, helping to reduce side reactions and gas generation inside the battery, thereby improving the energy density, cycle stability and safety of the battery.

[0095] In some optional embodiments, the order of steps S2A, S2B, and S2C can be arbitrarily replaced, or steps S2A, S2B, and S2C can be performed simultaneously, which can improve the efficiency of step S2.

[0096] like Figure 6 as well as Figure 7 As shown, in some embodiments of the present application, an unpackaged area 705 is left between the second packaged area 702 and the third packaged area 703 . And / or, an unpackaged area 705 is left between the second packaged area 702 and the fourth packaged area 704 .

[0097] In the above technical solution, increasing the number of unpackaged areas 705 provides more channels for evacuating the inner cavity. During the packaging process, these unpackaged areas 705 can be used as air evacuation ports, so that the vacuum pump can evacuate the air in the inner cavity more quickly and efficiently. This not only shortens the time for evacuation, but also improves the vacuum degree of the inner cavity, creating a more favorable environment for subsequent packaging steps. The presence of the unpackaged areas 705 provides more space for expansion and contraction of the packaging film during the heating and pressurization process. This helps to reduce wrinkles caused by material stress concentration, especially at the edges and corners of the packaging film. By reasonably arranging the unpackaged areas 705, the risk of wrinkles can be further reduced and the flatness and aesthetics of the package can be improved.

[0098] like Figure 5 As shown, in some embodiments of the present application, two ends of the second packaging area 702 along the first direction X are respectively connected to the third packaging area 703 and the fourth packaging area 704. Exemplarily, one end of the second packaging area 702 along the first direction X is overlapped and connected to the third packaging area 703, and the other end of the second packaging area 702 along the first direction X is overlapped and connected to the fourth packaging area 704.

[0099] In the above structure, overlap means that two areas overlap at least partially. An overlapping area is formed between the second packaging area 702 and the third packaging area 703 and the fourth packaging area 704. This overlapping structure can form a stronger bonding force during the hot pressing welding process, reducing the leakage problem caused by material gaps or loose bonding. Therefore, it significantly reduces the risk of leakage between packaging areas and improves the sealing performance of the inner cavity.

[0100] The overlap connection not only improves the sealing, but also enhances the overall strength of the packaging structure. During the operation of the solid-state battery, the packaging film may be subjected to certain pressure and stress due to the internal chemical reaction and the influence of the external environment. The overlap connection increases the bonding area and bonding force, making the packaging structure more durable and able to withstand greater stress and pressure changes, thereby improving the stability of the solid-state battery operation.

[0101] In some embodiments of the present application, one end of the first encapsulation area 701 along the first direction X is connected to the fourth encapsulation area 704 .

[0102] The above connection method reduces the number of seams between the first packaging area 701 and the fourth packaging area 704, thereby reducing the risk of leakage. During the packaging process, the seams are potential leakage points because the bonding between the materials may not be completely tight or may be affected by subsequent process steps and produce tiny gaps. By reducing the number of seams and ensuring a firm connection between the first packaging area 701 and the fourth packaging area 704, the sealing performance of the inner cavity can be significantly improved, preventing gas or liquid from penetrating, and maintaining the purity and stability of the internal environment of the battery. By improving the sealing between the first packaging area 701 and the fourth packaging area 704, the impact of these factors on the operation of the battery can be reduced, ensuring that the battery can operate stably for a long time, and improving its service life and reliability.

[0103] like Figure 8 as well as Fig. 9 As shown, in some embodiments of the present application, step S2 includes:

[0104] S2A, hot pressing the two packaging films to form a first packaging area 701 extending along the first direction X;

[0105] S2B, hot pressing the two packaging films to form a second packaging area 702 extending along the first direction X;

[0106] S2C, hot pressing the two packaging films to form a third packaging area 703 extending along the second direction Y.

[0107] The first direction X is perpendicular to the second direction Y. The first packaging area 701 and the second packaging area 702 are respectively located on both sides of the electrode assembly 10 along the second direction Y, and the third packaging area 703 is located on one side of the electrode assembly 10 along the first direction X. Both ends of the third packaging area 703 are respectively connected to the first packaging area 701 and the second packaging area 702.

[0108] In the above technical solution, a first packaging area 701, a second packaging area 702 and a third packaging area 703 are set to surround the three sides of the electrode assembly 10, and one side is reserved for non-packaging to facilitate vacuuming. This packaging method can significantly reduce the number of times the packaging film is heated and pressurized. This not only simplifies the packaging process, but also shortens the packaging time and improves the packaging efficiency. By reducing the number of connection points between the packaging areas, the sealing of the solid-state battery is also improved. Connection points are often potential leakage points because they may be affected by uneven materials, loose bonding or subsequent process steps to produce tiny gaps. By reducing the number of connection points and ensuring that each connection point is carefully designed and processed, the risk of leakage can be significantly reduced and the sealing performance of the inner cavity can be improved.

[0109] like Fig.10 as well as Fig.11 As shown, in some embodiments of the present application, step S2 includes:

[0110] S2A, hot pressing the two packaging films to form a first packaging area 701 extending along the first direction X;

[0111] S2B, hot pressing the two packaging films to form a second packaging area 702 extending along the first direction X;

[0112] S2C, hot pressing the two packaging films to form a third packaging area 703 extending along the second direction Y;

[0113] S2D. Thermally press the two packaging films to form a fourth packaging area 704 and a fifth packaging area 706 extending along the second direction Y.

[0114] Among them, the fourth packaging area 704 is connected to the first packaging area 701, the fifth packaging area 706 is connected to the second packaging area 702, and an unpackaged area 705 is formed between the fourth packaging area 704 and the fifth packaging area 706. In the above technical solution, by setting the fourth packaging area 704 and the fifth packaging area 706, the unpackaged area 705 is set in the middle of the side of the electrode assembly 10, which can facilitate the hot pressing and vacuuming operations of the unpackaged area 705, thereby improving the convenience of operation.

[0115] In some optional embodiments, the order of steps S2A, S2B, S2C and S2D may be arbitrarily replaced, or steps S2A, S2B, S2C and S2D may be performed simultaneously.

[0116] like Fig.12 As shown, in some embodiments of the present application, step S1 includes:

[0117] S1A, providing a packaging film;

[0118] S1B, placing the electrode assembly 10 on the packaging film;

[0119] S1C, folding the packaging film in half so that the packaging film forms two stacked packaging films, and the electrode assembly 10 is located between the two packaging films.

[0120] In the above structure, the folding method simplifies the steps that originally required two films to be placed and stacked separately into the operation of one film, and the packaging preparation can be completed by folding it directly, which reduces the operation steps in the production process, reduces the complexity of the operation and the error rate. The folding method can distribute the pressure more evenly during the packaging process and reduce the packaging defects caused by uneven stacking or misalignment. In addition, the film layers after folding are more tightly bonded, which helps to improve the sealing and stability of the package. In the design of the automated production line, the folding method can simplify the mechanical structure and control system, reduce the complex mechanical arms and precision positioning devices required for multi-layer film processing, thereby reducing the manufacturing cost and maintenance difficulty of automated equipment, thereby improving the packaging efficiency.

[0121] The embodiment of the present application provides a solid-state battery, which is manufactured using the manufacturing method of the solid-state battery in the above embodiment. The present application provides an electrical device, which includes the solid-state battery in the above embodiment, and the solid-state battery is used to provide electrical energy. The solid-state battery is manufactured using the method in the above embodiment, and the two packaging films are stacked, which can facilitate the hot pressing and welding of the packaging film, thereby improving the connection efficiency of the subsequent packaging film. The packaging area and the unpackaged area 705 jointly enclose the electrode assembly 10 to form an inner cavity for accommodating the electrode assembly 10. In particular, the packaging area is connected outside the sealed cavity, and then the sealed cavity is evacuated to discharge the air in the inner cavity, and then the unpackaged area 705 is hot pressed, which can improve the vacuum degree in the inner cavity. In addition, the above method can reduce the risk of wrinkles at the connection of the packaging film, improve the flatness of the plastic film package, and thus improve the performance of the solid-state battery.

[0122] 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 solid-state battery, characterized in that: include: Placing the electrode assembly between two stacked packaging films; Hot pressing partial areas of the two packaging films to form a packaging area and an unpackaging area arranged along the periphery of the electrode assembly, wherein the two packaging films are connected in the packaging area and are not connected in the unpackaging area; Placing the two packaging films and the electrode assembly in a sealed cavity, and evacuating the sealed cavity; The unpackaged area is hot pressed to form a sealed inner cavity between the two packaging films, wherein the electrode assembly is arranged in the inner cavity.

2. The manufacturing method according to claim 1, characterized in that: The step of hot pressing partial areas of the two packaging films to form a packaging area and a non-packaging area arranged along the periphery of the electrode assembly comprises: hot pressing the two packaging films to form a first packaging area extending along a first direction; hot pressing the two packaging films to form a second packaging area extending along the first direction; hot pressing the two packaging films to form a third packaging area extending along the second direction; hot pressing the two packaging films to form a fourth packaging area extending along the second direction; Wherein, the first direction is perpendicular to the second direction, the first packaging area and the second packaging area are respectively located on both sides of the electrode assembly along the second direction, and the third packaging area and the fourth packaging area are respectively located on both sides of the electrode assembly along the first direction; The unpackaged area is left between the first packaged area and the third packaged area.

3. The manufacturing method according to claim 2, characterized in that: The unpackaged area is left between the second packaged area and the third packaged area; and / or the unpackaged area is left between the second packaged area and the fourth packaged area.

4. The manufacturing method according to claim 2, characterized in that: Two ends of the second packaging area along the first direction are respectively connected to the third packaging area and the fourth packaging area.

5. The manufacturing method according to claim 4, characterized in that: One end of the first packaging area along the first direction is connected to the fourth packaging area.

6. The manufacturing method according to claim 1, characterized in that: The step of hot pressing partial areas of the two packaging films to form a packaging area and a non-packaging area arranged along the periphery of the electrode assembly comprises: hot pressing the two packaging films to form a first packaging area extending along a first direction; hot pressing the two packaging films to form a second packaging area extending along the first direction; hot pressing the two packaging films to form a third packaging area extending along the second direction; Wherein, the first direction is perpendicular to the second direction, the first packaging area and the second packaging area are respectively located on both sides of the electrode assembly along the second direction, and the third packaging area is located on one side of the electrode assembly along the first direction; Two ends of the third packaging area are respectively connected to the first packaging area and the second packaging area.

7. The manufacturing method according to claim 6, characterized in that: The step of hot pressing partial areas of the two packaging films to form a packaging area and an unpackaging area arranged along the periphery of the electrode assembly further includes: hot pressing the two packaging films to form a fourth packaging area and a fifth packaging area extending along the second direction; The fourth packaging area is connected to the first packaging area, the fifth packaging area is connected to the second packaging area, and the unpackaged area is formed between the fourth packaging area and the fifth packaging area.

8. The manufacturing method according to any one of claims 1 to 6, characterized in that: The step of placing the electrode assembly between two stacked packaging films comprises: providing a packaging film; placing the electrode assembly on the packaging film; The packaging film is folded in half to form two stacked packaging films, and the electrode assembly is located between the two packaging films.

9. A solid-state battery, characterized in that: The solid-state battery is manufactured using the method for manufacturing a solid-state battery according to any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the solid-state battery as claimed in claim 9, wherein the solid-state battery is used to provide electrical energy.

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