Solid-state battery cell, battery device, and method for manufacturing solid-state battery

Abstract

The invention discloses a solid-state battery monomer, a battery device and a manufacturing method of a solid-state battery. The solid-state battery monomer comprises an electrode assembly and a packaging shell, the packaging shell comprises two packaging films, the electrode assembly is arranged between the two packaging films, the two packaging films are connected and form a packaging part arranged along the periphery of the electrode assembly, and a concave-convex structure is arranged on the peripheral side of at least part of the packaging part. According to the structure, the risk that the packaging part of the packaging shell is wrinkled in the packaging process can be reduced, and the sealing performance of the solid-state battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a solid-state battery cell, a battery device, and a method for manufacturing a solid-state battery. 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, the sealing film is hot-pressed to seal the electrode assembly inside the sealing shell. During the hot-pressing process, the sealing edge of the sealing film is prone to wrinkles. How to improve the flatness of the plastic sealing film during the hot-pressing process is one of the research issues in this field. Summary of the invention

[0004] In view of the above problems, the present application provides a solid-state battery cell, a battery device and a method for manufacturing a solid-state battery, which can reduce the risk of wrinkles on the edge of the plastic film and improve the sealing performance of the plastic shell, thereby improving the operating stability of the solid-state battery cell.

[0005] In a first aspect, the present application provides a solid-state battery cell, including an electrode assembly and a packaging shell. The packaging shell includes two packaging films, the electrode assembly is arranged between the two packaging films, the two packaging films are connected to form a packaging part arranged along the periphery of the electrode assembly, and at least part of the peripheral side of the packaging part is provided with a concave-convex structure.

[0006] In the technical solution of the embodiment of the present application, the electrode assembly is sealed by providing a packaging shell, which provides a stable reaction environment for the electrode assembly and improves the operating stability of the solid-state battery cell. The packaging part is arranged along the circumference of the electrode assembly to match the shape of the electrode assembly, thereby improving the sealing stability. In addition, the packaging part directly connects the two packaging films to improve the connection efficiency. A concave-convex structure is provided on the circumferential side of the packaging part, which can absorb at least part of the wrinkles of the packaging part during the packaging process, thereby improving the sealing performance of the solid-state battery cell and thus improving the operating stability of the solid-state battery cell.

[0007] In some embodiments, the concavo-convex structure is disposed on the inner side of the packaging part close to the electrode assembly. By disposing the concavo-convex structure on the inner side, a buffer zone can be formed inside the packaging part to absorb wrinkles generated by heat pressing.

[0008] In some embodiments, the concavo-convex structure is arranged around the inner circumference of the packaging part. The concavo-convex structure is arranged around the packaging part to fully absorb the wrinkles generated during the hot pressing process of the packaging part, thereby improving the sealing performance and connection strength of the packaging part.

[0009] In some embodiments, the concave-convex structure is a curved strip-shaped protrusion, which extends along the periphery of the electrode assembly toward the packaging portion, and a plurality of curved strip-shaped protrusions are arranged at intervals around the periphery of the electrode assembly. In the above structure, the concave-convex structure is arranged along the direction in which wrinkles are generated, thereby improving the ability to absorb wrinkles.

[0010] In some embodiments, the solid-state battery cell further includes an electrode lead-out member, which is connected to the electrode assembly, and the electrode lead-out member passes between two packaging films, and the concave-convex structure is provided on the side of the electrode assembly away from the electrode lead-out member. In the above structure, the electric energy of the electrode assembly is transmitted by providing the electrode lead-out member, and the electrode lead-out member passes between the two packaging films, which can facilitate the hot pressing packaging of the packaging film, thereby improving the packaging efficiency and the connection stability of the electrode lead-out member. In particular, the concave-convex structure is provided on the side away from the electrode lead-out member, which can improve the structural stability of the electrode lead-out member.

[0011] In some embodiments, the packaging portion includes a first packaging strip and a second packaging strip extending along a first direction, and a third packaging strip and a fourth packaging strip extending along a second direction. The first direction is perpendicular to the second direction. The first packaging strip, the second packaging strip, the third packaging strip and the fourth packaging strip are connected end to end in sequence and are arranged along the circumference of the electrode assembly. The concave-convex structure is arranged on the inner side of at least one of the first packaging strip, the second packaging strip, the third packaging strip and the fourth packaging strip. In the above structure, by arranging a packaging strip, a second packaging strip, a third packaging strip and a fourth packaging strip, and arranging them along the four sides of the electrode assembly, it is possible to match the shape of the electrode assembly, reduce the redundant space of the plastic package, and improve the sealing effect. The concave-convex structure can absorb the wrinkles around the packaging strip and improve the sealing performance.

[0012] In a second aspect, the present invention provides a battery device comprising the solid-state battery cell of the first aspect.

[0013] In a third aspect, the present application provides a method for manufacturing a solid-state battery cell, comprising: providing a first packaging film and a second packaging film, the first packaging film having a first packaging area and a second packaging area arranged along its own circumference, and the second packaging film having a third packaging area and a fourth packaging area arranged along its own circumference. A concave-convex structure is arranged on the circumferential side of the second packaging area. The electrode assembly is placed between the first packaging film and the second packaging film. The two packaging films are hot-pressed so that the first packaging area and the third packaging area are welded to form a packaging area. The two packaging films are hot-pressed so that the second packaging area and the fourth packaging area are welded to form a reinforcement area. Wherein, the packaging area and the reinforcement area are enclosed to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly.

[0014] In the above technical solution, the two packaging films are connected by hot pressing, which improves the connection efficiency and connection strength of the packaging films. A concave-convex structure is provided in the second packaging area to disperse the wrinkles of the second packaging area to the suction wrinkle structure, thereby reducing the risk of wrinkles in the second packaging area during the packaging process, improving the sealing performance of the packaging shell, and thus improving the operating stability of the solid-state battery monomer.

[0015] In some embodiments, the step of providing a concave-convex structure on the circumferential side of the second packaging area includes: applying pressure to the circumferential area of ​​the second packaging area to form a concave or convex structure on the surface of the circumferential area of ​​the second packaging area. In the above structure, the convex or concave structure provided in the non-packaging area can disperse and absorb wrinkles in the packaging process, reduce the risk of wrinkles in the packaging area, improve the sealing of the packaging shell, and improve the stability of the operation of the solid-state battery monomer.

[0016] In a fourth aspect, the present application provides a method for manufacturing a solid-state battery cell, comprising: providing a first packaging film and a second packaging film, the first packaging film having a fifth packaging area arranged along its own circumference, and the second packaging film having a sixth packaging area arranged along its own circumference. A concave-convex structure is arranged on the circumferential side of the fifth packaging area and / or the sixth packaging area. The electrode assembly is placed between the first packaging film and the second packaging film. The two packaging films are hot-pressed so that the fifth packaging area and the sixth packaging area are welded to form a packaging portion, which encloses the electrode assembly along the circumference to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly.

[0017] The above method first forms a concave-convex structure around the packaging area and then performs hot pressing packaging, which improves the packaging efficiency, reduces the risk of wrinkles in the packaging part, and improves the sealing performance of the packaging part.

[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; Figure 2 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application; Figure 3 A schematic diagram of the structure of a solid-state battery provided in some embodiments of the present application; Figure 4 A schematic diagram of the structure of a solid-state battery provided in some other embodiments of the present application; Figure 5 A schematic diagram of the structure of packaging films provided in other embodiments of the present application; Figure 6 A flow chart of a method for manufacturing a solid-state battery cell provided in some embodiments of the present application; Figure 7 A flow chart of a method for manufacturing a concave-convex structure of a solid-state battery cell provided in some other embodiments of the present application; Figure 8 A flow chart of a method for manufacturing a solid-state battery cell provided for some other embodiments of the present application.

[0021] DETAILED DESCRIPTION OF REFERENCE NUMERALS 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. Solid-state battery cell; 701. First packaging strip; 702. Second packaging strip; 703. Third packaging strip; 704. Fourth packaging strip; 10. Electrode assembly; 20. Packaging shell; 30. Non-packaging area; 50. Concave-convex structure; 60. Packaging part; 70. Electrode lead-out member. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] A solid-state battery refers to a battery that uses solid substances as electrolytes. A solid-state battery generally includes a packaging shell and an electrode assembly disposed in the packaging shell. The installation process of the packaging shell generally involves stacking two packaging films and then placing them in a vacuum environment for packaging. Then, the outer periphery of the electrode assembly on the packaging film is heated and pressurized so that the two packaging films are hot-melt connected to form an internally sealed inner 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 packaging connection 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.

[0033] Based on the above problems, the embodiments of the present application provide a solid-state battery cell and a battery device including the same, which seals the electrode assembly by setting a packaging shell to provide a stable reaction environment for the electrode assembly and improve the operating stability of the solid-state battery cell. The packaging part is arranged along the circumference of the electrode assembly to match the shape of the electrode assembly, thereby improving the sealing stability. In addition, the packaging part directly connects the two packaging films to improve the efficiency of the connection. The surrounding side of the packaging part is provided with a concave-convex structure, which can absorb at least part of the wrinkles of the packaging part during the packaging process, thereby improving the sealing performance of the solid-state battery cell and thus improving the operating stability of the solid-state battery cell.

[0034] The battery device of the present application is described in detail below.

[0035] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies and a box, wherein the battery cell assembly is used to provide voltage and capacity, and the box is used to accommodate the battery cell assembly and related components. The battery cell assembly may include multiple battery cells, and the multiple battery cells are connected in series, in parallel, or in mixed connection through a busbar component.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The battery cells may include solid-state battery cells.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0046] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0047] 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.

[0048] 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 .

[0049] 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.

[0050] Figure 2 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0051] The box body 5 is used to accommodate the battery monomer, and the box body 5 can be of various structures. In some embodiments, the box body 5 can include a first box body portion 51 and a second box body portion 52, the first box body portion 51 and the second box body portion 52 cover each other, and the first box body portion 51 and the second box body portion 52 jointly define a receiving space 53 for accommodating the battery monomer. Of course, the first box body portion 51 and the second box body portion 52 can be of various shapes, such as a cylinder, a cuboid, etc.

[0052] In the battery device 2, there can be one or more battery cells. If there are more than one battery cell, the battery cells can be connected in series, in parallel or in a mixed connection. A mixed connection means that the battery cells are connected in series and in parallel. The battery cells can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the battery cells can be accommodated in the box 5; of course, the battery cells can also be connected in series, in parallel or in a mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 5.

[0053] In some optional embodiments, the battery cells may also be directly accommodated in the box body 5 to reduce the connection components or support components required to form the battery module and improve the energy density of the battery device 2.

[0054] For example, a battery cell may be the smallest unit constituting the battery device 2 .

[0055] The battery cell is a solid-state battery cell, which generally includes: a packaging shell 20 and an electrode assembly 10. The packaging shell 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.

[0056] 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.

[0057] Sulfide solid electrolytes include sulfide crystalline solid electrolytes, sulfide glass and glass ceramic solid electrolytes.

[0058] 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 schematic diagram of the structure of a solid-state battery provided in some other embodiments of the present application, Figure 5 A schematic diagram of the structure of the packaging film provided in some other embodiments of the present application.

[0059] As shown in the figure, an embodiment of the present application provides a solid-state battery cell 7, including an electrode assembly 10 and a packaging shell 20. The packaging shell 20 includes two packaging films, the electrode assembly 10 is arranged between the two packaging films, the two packaging films are connected to form a packaging part 60 arranged along the periphery of the electrode assembly 10, and at least a part of the peripheral side of the packaging part 60 is provided with a concave-convex structure 50.

[0060] The packaging part 60 on the packaging shell 20 is formed by connecting two packaging films by heat pressing or bonding, wherein the area where the two packaging films are not connected is the non-packaging area 30. Relative to the packaging part 60, the non-packaging areas 30 of the two packaging films have a certain range of relative movement ability. The peripheral side of the packaging part 60 refers to the non-packaging area 30 around the packaging part 60. The concave-convex structure 50 on the surface refers to the convex or concave structure formed on the surface of the packaging film in the non-packaging area 30 along the thickness direction.

[0061] In the above structure, the electrode assembly 10 is sealed by setting the packaging shell 20, providing a stable reaction environment for the electrode assembly 10, and improving the operating stability of the solid-state battery cell 7. The packaging part 60 is arranged along the circumference of the electrode assembly 10, and fits closely with the shape of the electrode assembly 10, providing uniformity and tightness of the packaging, which not only improves the sealing effect, but also reduces the gap between the packaging material and the electrode assembly 10.

[0062] A convex-convex structure 50 with protrusions and depressions is provided in the non-encapsulation area 30 (or edge area) around the encapsulation part 60, which can absorb or disperse the wrinkles or stress concentration caused by factors such as the encapsulation film material, temperature, and pressure during the encapsulation process. In this way, even if certain wrinkles are generated during the encapsulation process, these wrinkles can be "absorbed" by the concave-convex structure 50 without destroying the overall sealing of the encapsulation part 60. The presence of the concave-convex structure 50 significantly improves the sealing performance of the solid-state battery cell 7. They not only reduce the impact of wrinkles on the sealing effect, but also increase the contact area and friction between the encapsulation films, thereby improving the firmness and reliability of the encapsulation. Due to the improved encapsulation performance and enhanced sealing stability, the solid-state battery cell 7 can better resist the influence of the external environment and the fluctuation of the internal chemical reaction during operation. This helps to extend the service life of the battery and improve performance stability and safety.

[0063] In some embodiments of the present application, the concavo-convex structure is disposed on the inner side of the packaging part close to the electrode assembly. By arranging the concavo-convex structure on the inner side, a buffer zone can be formed inside the packaging part to absorb wrinkles generated by heat pressing.

[0064] In some embodiments of the present application, the concavo-convex structure is arranged around the inner circumference of the packaging part. The concavo-convex structure is arranged around the packaging part to fully absorb the wrinkles generated during the hot pressing process of the packaging part, thereby improving the sealing performance and connection strength of the packaging part.

[0065] In some embodiments of the present application, the concave-convex structure is a curved strip-shaped protrusion, which extends along the periphery of the electrode assembly toward the packaging portion, and a plurality of curved strip-shaped protrusions are arranged at intervals around the periphery of the electrode assembly. Exemplarily, the orthographic projection of the curved strip-shaped protrusion structure in the thickness direction of the packaging film is a C-shaped, S-shaped, or Z-shaped structure.

[0066] In the above structure, the concave-convex structure is arranged along the direction in which wrinkles are generated, thereby improving the ability to absorb wrinkles.

[0067] In some embodiments of the present application, the solid-state battery cell 7 also includes an electrode lead-out member 70, which is connected to the electrode assembly 10 and passes through between two packaging films, and the concave-convex structure 50 is arranged on the side of the electrode assembly 10 away from the electrode lead-out member 70.

[0068] In the above structure, the electrode lead-out part 70 serves as a bridge connecting the solid-state battery cell 7 with the external circuit, and is responsible for transmitting the electric energy generated by the electrode assembly 10. The electrode lead-out part 70 passes through the two packaging films. This design not only facilitates the hot pressing packaging of the packaging films, but also ensures a stable connection between the electrode lead-out part 70 and the electrode assembly 10. During the hot pressing packaging process, the packaging film can tightly wrap the electrode lead-out part 70 to form a reliable sealing structure to prevent external impurities from entering the interior of the packaging shell 20. In addition, since the electrode lead-out part 70 has already passed through the packaging film in advance, there is no need to perform additional processing or fixation on the electrode lead-out part 70 during hot pressing packaging. This greatly simplifies the packaging process and improves the packaging efficiency.

[0069] By disposing the concavo-convex structure 50 on a side away from the electrode lead-out member 70 , the manufacturing efficiency of the solid-state battery cell 7 and the structural stability of the electrode lead-out member 70 can be improved.

[0070] like Figure 4 as well as Figure 5 As shown, in some embodiments of the present application, the packaging portion 60 includes a first packaging strip 701 and a second packaging strip 702 extending along a first direction X, and a third packaging strip 703 and a fourth packaging strip 704 extending along a second direction Y. The first direction X is perpendicular to the second direction Y. The first packaging strip 701, the second packaging strip 702, the third packaging strip 703, and the fourth packaging strip 704 are connected end to end in sequence and are arranged along the circumference of the electrode assembly 10. The concave-convex structure 50 is arranged on the inner side of at least one of the first packaging strip 701, the second packaging strip 702, the third packaging strip 703, and the fourth packaging strip 704.

[0071] The electrode assembly 10 of the solid-state battery cell 7 is usually a cube-like structure. In the above structure, the four packaging strips extend along the four sides of the electrode assembly 10 respectively, which can fit the shape of the electrode assembly 10 tightly and reduce the gap caused by shape mismatch. This not only helps to improve the sealing of the package, but also reduces the entry of external impurities or moisture into the battery, which has an adverse effect on the performance of the solid-state battery cell 7. The design of four packaging strips can accurately control the packaging part 60, reduce unnecessary redundant space, and make the package more compact and efficient. Since the four packaging strips are connected end to end in sequence, a complete packaging closed loop is formed, and each seam can be well sealed during the packaging process. At the same time, the arrangement of the concave-convex structure 50 on the inner side of at least one packaging strip can further enhance the strength and sealing of the area, and improve the reliability and durability of the entire packaging part 60.

[0072] Optionally, multiple concave-convex structures 50 may be provided, one each on the inner side of the first packaging strip 701, the second packaging strip 702, the third packaging strip 703, and the fourth packaging strip 704. Alternatively, the size and shape of the packaging strip may be adjusted to accommodate electrode assemblies 10 of different specifications. This design makes the packaging process more flexible and can meet the needs of different application scenarios.

[0073] The embodiments of the present application also provide a battery device, including the solid-state battery cell 7 in the above-mentioned embodiments, which seals the electrode assembly by setting a packaging shell, provides a stable reaction environment for the electrode assembly 10, and improves the operating stability of the solid-state battery cell 7. The packaging part 60 is arranged along the circumference of the electrode assembly 10, matching the shape of the electrode assembly 10, thereby improving the sealing stability. In addition, the packaging part 60 directly connects the two packaging films to improve the connection efficiency. The circumferential side of the packaging part 60 is provided with a concave-convex structure 50, which can absorb at least part of the wrinkles of the packaging part 60 during the packaging process, thereby improving the sealing performance of the solid-state battery cell 7, thereby improving the operating stability of the solid-state battery cell 7.

[0074] like Figure 6 As shown, an embodiment of the present application provides a method for manufacturing a solid-state battery cell 7, comprising: S1, providing a first packaging film and a second packaging film, wherein the first packaging film has a first packaging area and a second packaging area arranged along its circumference, and the second packaging film has a third packaging area and a fourth packaging area arranged along its circumference; S2, providing a concavo-convex structure 50 on the peripheral side of the second packaging area; S3, placing the electrode assembly 10 between the first packaging film and the second packaging film; S4, hot pressing the two packaging films to fuse the first packaging area and the third packaging area to form a packaging area; S5. Hot-press the two packaging films to fuse the second packaging area and the fourth packaging area to form a reinforcement area; wherein the packaging area and the reinforcement area are enclosed to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly 10.

[0075] In step S1, the first packaging film and the second packaging film can be aluminum-plastic film or steel-plastic film. The first packaging area and the second packaging area are areas that can be melted after heating and bonded to other packaging films. In step S2, the peripheral side of the second packaging area refers to a non-packaging area arranged along the circumference of the second packaging area, and this position can be an area that is not heated and melted. In step S3, the electrode assembly 10 refers to the electrode assembly 10 of the solid-state battery cell 7.

[0076] In the above technical solution, the two packaging films are connected by hot pressing, which improves the connection efficiency and connection strength of the packaging films. A concave-convex structure is arranged inside the second packaging area to disperse the wrinkles of the second packaging area to the suction wrinkle structure, thereby reducing the risk of wrinkles in the second packaging area during the packaging process, improving the sealing performance of the packaging shell 20, and thus improving the operating stability of the solid-state battery cell 7.

[0077] like Figure 7 As shown, in some embodiments of the present application, step S2 includes: S21, pressurizing the circumferential area of ​​the second packaging area to form a concave or convex structure on the surface of the circumferential area of ​​the second packaging area.

[0078] In the above structure, the convex or concave structure set in the non-packaging area 30 can disperse and absorb wrinkles in the packaging process, reduce the risk of wrinkles in the packaging part 60, and improve the sealing of the packaging shell 20, so as to improve the stability of the operation of the solid-state battery cell 7.

[0079] like Figure 8 As shown, the embodiment of the present application also provides a method for manufacturing a solid-state battery cell 7, comprising: SA, providing a first packaging film and a second packaging film, the first packaging film having a fifth packaging area arranged along its circumference, and the second packaging film having a sixth packaging area arranged along its circumference; SB, providing a concavo-convex structure 50 on the peripheral side of the fifth packaging area and / or the sixth packaging area; SC, placing the electrode assembly 10 between the first packaging film and the second packaging film. The two packaging films are hot pressed to fuse the fifth packaging area and the sixth packaging area to form a packaging portion 60, which surrounds the electrode assembly 10 along the circumference to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly 10.

[0080] The above method first forms the concave-convex structure 50 around the packaging area, and then performs hot pressing packaging, which improves the packaging efficiency, reduces the risk of wrinkles on the packaging part 60, and improves the sealing performance of the packaging part 60.

[0081] 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 solid-state battery cell, characterized in that: include: Electrode assembly; The packaging shell comprises two packaging films, the electrode assembly is arranged between the two packaging films, the two packaging films are connected to form a packaging part arranged along the periphery of the electrode assembly, and at least a part of the periphery of the packaging part is provided with a concave-convex structure.

2. The solid-state battery cell according to claim 1, characterized in that: The concave-convex structure is arranged on the inner side of the packaging portion close to the electrode assembly.

3. The solid-state battery cell according to claim 2, characterized in that: The concave-convex structure is disposed around the inner circumference of the packaging portion.

4. The solid-state battery cell according to claim 1, characterized in that: The concave-convex structure includes a plurality of curved strip-shaped protrusions, which extend along the outer circumference of the electrode assembly toward the packaging portion, and the plurality of curved strip-shaped protrusions are arranged at intervals around the outer circumference of the electrode assembly.

5. The solid-state battery cell according to any one of claims 1 to 4, characterized in that: The solid-state battery cell further includes an electrode lead-out member, which is connected to the electrode assembly and passes through between the two packaging films. The concave-convex structure is disposed on a side of the electrode assembly away from the electrode lead-out member.

6. The solid-state battery cell according to claim 5, characterized in that: The encapsulation part includes: a first encapsulation strip and a second encapsulation strip extending along a first direction, and a third encapsulation strip and a fourth encapsulation strip extending along a second direction. Among them, the first direction is perpendicular to the second direction, the first packaging strip, the second packaging strip, the third packaging strip and the fourth packaging strip are connected end to end in sequence and arranged along the circumference of the electrode assembly, and the concave-convex structure is arranged on the inner side of at least one of the first packaging strip, the second packaging strip, the third packaging strip and the fourth packaging strip.

7. A battery device, characterized in that: It comprises a solid-state battery cell as described in any one of claims 1 to 6.

8. A method for manufacturing a solid-state battery cell, characterized in that: include: Providing a first packaging film and a second packaging film, wherein the first packaging film has a first packaging area and a second packaging area arranged along its circumference, and the second packaging film has a third packaging area and a fourth packaging area arranged along its circumference; Arranging a concavo-convex structure on the peripheral side of the second packaging area; placing an electrode assembly between the first packaging film and the second packaging film; Hot pressing the two packaging films to fuse the first packaging area and the third packaging area to form a packaging area; Hot pressing the two packaging films to fuse the second packaging area and the fourth packaging area to form a reinforcement area; The packaging area and the reinforcement area are enclosed to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly.

9. The method for manufacturing a solid-state battery cell according to claim 8, characterized in that: The step of providing a concave-convex structure on the circumferential side of the second packaging area includes: applying pressure to the circumferential area of ​​the second packaging area to form a concave or convex structure along the thickness direction in the circumferential area of ​​the second packaging area.

10. A method for manufacturing a solid-state battery cell, characterized in that: include: Providing a first packaging film and a second packaging film, wherein the first packaging film has a fifth packaging area arranged along its circumference, and the second packaging film has a sixth packaging area arranged along its circumference; Arranging a concavo-convex structure on the peripheral side of the fifth packaging area and / or the sixth packaging area; placing an electrode assembly between the first packaging film and the second packaging film; The two packaging films are hot-pressed to fuse the fifth packaging area and the sixth packaging area to form a packaging part, which surrounds the electrode assembly along a circumference to form a sealed inner cavity between the first packaging film and the second packaging film, and the inner cavity is used to accommodate the electrode assembly.

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