Battery cell and method for manufacturing the same, battery device, and electric device

Abstract

The application provides a battery cell and a manufacturing method thereof, a battery device and a power utilization device. The battery cell comprises a housing with a containing cavity. An electrode assembly is arranged in the containing cavity. The electrode assembly comprises a first pole piece, a second pole piece and an electrolyte layer. The first pole piece and the second pole piece have opposite polarities. The first pole piece and the second pole piece are laminated along a lamination direction. The electrolyte layer is used for isolating the first pole piece and the second pole piece. The first pole piece comprises a first main body and a first pole lug extending from an outer circumferential surface of the first main body. The second pole piece comprises a second main body and a second pole lug extending from an outer circumferential surface of the second main body. A part of the second main body protrudes from the outer circumferential surface of the first main body. A first insulation layer is arranged along the outer circumferential surface of the first main body and connected to the outer circumferential surface of the first main body. In the lamination direction, at least part of the first insulation layer overlaps the second main body. The battery cell provided by the application effectively inhibits the edge overlap of the first pole piece and the second pole piece.

Description

Technical Field

[0001] This application relates to the field of battery production technology, and in particular to battery cells and their manufacturing methods, battery devices and electrical devices. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and rechargeable alkaline zinc-manganese batteries, among others.

[0003] In the development of batteries, how to ensure the reliability of individual battery cells is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a battery cell and its manufacturing method, a battery device and an electrical device, which aim to improve the reliability of the battery cell to a certain extent.

[0005] In a first aspect, this application proposes a battery cell, which includes a casing, an electrode assembly, and a first insulating layer. The casing has a receiving cavity. The electrode assembly is disposed within the receiving cavity and includes a first electrode, a second electrode, and an electrolyte layer. The first and second electrodes have opposite polarities and are stacked along a lamination direction. The electrolyte layer is used to isolate the first and second electrodes. The first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. The second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body. A portion of the second body protrudes from the outer peripheral surface of the first body. The first insulating layer is disposed along the outer periphery of the first body and connected to the outer peripheral surface of the first body. In the lamination direction, at least a portion of the first insulating layer overlaps with the second body.

[0006] The battery cell provided in this application has a first electrode and a second electrode stacked along a lamination direction. The first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. The second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body. A portion of the second body protrudes from the outer peripheral surface of the first body. A first insulating layer is disposed on the outer periphery of the first body and connected to the outer peripheral surface of the first body. That is, the edge of the first electrode has a first insulating layer for insulating the first electrode and the second electrode. This reduces the phenomenon of edge warping of the first electrode during the pressurization process of the electrode assembly and effectively suppresses the edge overlap of the first electrode and the second electrode, reducing the occurrence of internal short circuits in the electrode assembly, thereby improving the reliability of the battery cell.

[0007] According to one embodiment of this application, a first insulating layer is disposed around a first body, and the first insulating layer is provided with a first through hole, a portion of the first electrode tab being accommodated in the first through hole.

[0008] In these alternative embodiments, the first insulating layer surrounds the first body, which can more effectively reduce the risk of bridging short circuits. Furthermore, the first insulating layer can uniformly support the first electrode, further reducing deformation at the edges of the first electrode.

[0009] According to one embodiment of this application, in the lamination direction, the outer peripheral surface of the first body is flush with the outer peripheral surface of the electrolyte layer. A portion of the first insulating layer is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

[0010] In these alternative embodiments, a portion of the first insulating layer is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer. On the one hand, the first insulating layer can further fill the gap between two adjacent second bodies, which is beneficial to improving the overall structural stability of the electrode assembly. On the other hand, the connection between the first insulating layer and the electrolyte layer improves the connection stability of the first insulating layer and reduces the risk of the first insulating layer falling off from the electrode assembly.

[0011] According to one embodiment of this application, the first insulating layer includes a first portion and two second portions. The first portion is connected to the outer peripheral surface of the first body, and the two second portions are respectively located on both sides of the first portion. The two second portions are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

[0012] In these alternative embodiments, the arrangement is such that the first insulating layer is tightly bonded to the electrode assembly, further improving the overall stability of the battery cell structure.

[0013] According to one embodiment of this application, in the stacking direction, the side of the second portion opposite to the first portion is flush with the side of the electrolyte layer opposite to the first body.

[0014] In these alternative embodiments, a tight structure between the first insulating layer and the electrode body can be achieved, reducing the phenomenon of the edges of the first and second electrodes lifting up during subsequent pressurization, and effectively reducing the occurrence of internal short circuits.

[0015] According to one embodiment of this application, the battery cell further includes a second insulating layer, which is disposed along the outer periphery of the second body and connected to the second body.

[0016] In these alternative embodiments, the outer peripheral surface of the second body is provided with a second insulating layer, achieving dual protection from both the first and second insulating layers and reducing the possibility of edge contact. This dual insulation protection reduces the risk of short circuits. Furthermore, during pressurization, the first and second insulating layers can better absorb mechanical stress, reducing the occurrence of warping at the edges of the first and second electrodes. Additionally, the independent arrangement of the first and second insulating layers allows for a higher process tolerance and reduces manufacturing difficulty.

[0017] According to one embodiment of this application, a second insulating layer is disposed around a second body, and the second insulating layer is provided with a second through hole, a portion of which is accommodated in the second through hole.

[0018] In these alternative embodiments, the second insulating layer is disposed around the second body, which can more effectively reduce the risk of bridging short circuits. Moreover, the second insulating layer can uniformly absorb the stress of the second body, reducing the occurrence of warping at the edge of the second electrode.

[0019] According to one embodiment of this application, in the lamination direction, the outer peripheral surface of the second body is flush with the outer peripheral surface of the electrolyte layer. A portion of the second insulating layer is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

[0020] In these alternative embodiments, the second insulating layer is connected to the electrolyte layer, improving the connection stability of the second insulating layer and reducing the risk of the second insulating layer detaching from the electrode assembly. Furthermore, by sandwiching the second body between the electrolyte layer and the second insulating layer, excessive expansion or contraction of the first electrode sheet can be effectively limited during the charging and discharging of the battery cell, reducing deformation of the electrode assembly.

[0021] According to one embodiment of this application, the second insulating layer includes a third portion and two fourth portions. The third portion is connected to the outer peripheral surface of the second body, the two fourth portions are located on both sides of the third portion, and the two second portions are connected to the outer peripheral surfaces of two adjacent electrolyte layers.

[0022] In these alternative embodiments, the second insulating layer is configured to bond tightly to the electrode assembly, thereby further improving the overall stability of the battery cell structure.

[0023] According to one embodiment of this application, in a direction perpendicular to the stacking direction, the side of the fourth portion opposite to the third portion is flush with the side of the electrolyte layer opposite to the second body.

[0024] In these alternative embodiments, this arrangement allows the second insulating layer to more effectively protect the electrolyte layer. It also ensures a stable connection of the second insulating layer.

[0025] According to one embodiment of this application, in a direction perpendicular to the stacking direction, the first insulating layer does not extend beyond the second insulating layer.

[0026] In these alternative embodiments, the first and second insulating layers are not flush, which reduces the positional accuracy requirements for the first and second insulating layers and makes their assembly easier. Furthermore, while addressing the issue of overlap between the first and second electrodes, the use of insulating components can be appropriately reduced to lower manufacturing costs.

[0027] According to one embodiment of this application, in a direction perpendicular to the stacking direction, the size of the first insulating layer is larger than the size of the second insulating layer.

[0028] In these alternative embodiments, the size of the first insulating layer is larger than that of the second insulating layer in a direction perpendicular to the stacking direction, so that the first insulating layer can fully fill the gap between the two second bodies to provide stable support for the second bodies and reduce the phenomenon of the edge of the second electrode lifting.

[0029] According to one embodiment of this application, the first electrode is a positive electrode and the second electrode is a negative electrode.

[0030] According to one embodiment of this application, both the first insulating layer and the second insulating layer include an adhesive. The adhesive for the first insulating layer includes one or more of polypropylene, polyethylene, and polycarbonate, and the adhesive for the second insulating layer includes polystyrene.

[0031] In these alternative embodiments, both the first and second insulating layers include an adhesive to increase their adhesion, thereby improving the connection stability between the first insulating layer and the first electrode, and also improving the connection stability between the second insulating layer and the second electrode. Furthermore, the use of the adhesive gives the first and second insulating layers a degree of flexibility, allowing them to adapt to volume changes in the first and second electrodes during pressurization and charging / discharging processes. It also allows them to buffer stress through their own deformation, thereby improving the overall stability of the battery cell.

[0032] According to one embodiment of this application, the first insulating layer includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

[0033] According to one embodiment of this application, the first insulating layer is a porous insulating layer or a honeycomb insulating layer.

[0034] In these alternative embodiments, these specific alternative embodiments, the first insulating layer has a high stress dispersion efficiency.

[0035] According to one embodiment of this application, the thickness of the first insulating layer is from 5 μm to 500 μm.

[0036] In these alternative embodiments, the first insulating layer has a suitable thickness, which can effectively suppress the edge overlap of the first and second electrodes and appropriately reduce its proportion inside the battery cell, thus saving internal space of the battery cell.

[0037] Secondly, this application provides a method for manufacturing a single battery cell, comprising:

[0038] Provide the first insulating layer;

[0039] A first electrode is provided, wherein the first electrode includes a first body and a first electrode tab extending from the outer peripheral surface of the first body;

[0040] The first insulating layer covers at least a portion of the first body from the outside;

[0041] A second electrode and an electrolyte layer are provided, wherein the first electrode and the second electrode have opposite polarities, the second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the second body protruding from the outer peripheral surface of the first body;

[0042] A first electrode and a second electrode having a first insulating layer are alternately arranged along the stacking direction, such that at least a portion of the first insulating layer overlaps with the second body, and an electrolyte layer is used to isolate the first electrode and the second electrode to form an electrode assembly having a first insulating layer.

[0043] Pressure is applied to the first insulating layer and the electrode assembly;

[0044] The first insulating layer and electrode assembly are installed inside the housing.

[0045] Thirdly, this application provides a method for manufacturing a single battery cell, comprising:

[0046] Provide the first insulating layer;

[0047] An electrode assembly is provided, wherein the electrode assembly includes a first electrode, multiple electrodes, and an electrolyte layer, the first electrode and the second electrode have opposite polarities, the first electrode and the second electrode are alternately arranged along a stacking direction, the electrolyte layer is used to isolate the first electrode and the second electrode, the first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body, the second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the first body protrudes from the outer peripheral surface of the second body;

[0048] The first insulating layer covers at least a portion of the first body from the outside, such that at least a portion of the first insulating layer overlaps with the second body;

[0049] Pressure is applied to the first insulating layer and the electrode assembly;

[0050] The first insulating layer and electrode assembly are installed inside the housing.

[0051] Fourthly, this application provides a battery device including the aforementioned battery cell.

[0052] Fifthly, this application provides an electrical device, including a battery cell or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0053] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0054] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0055] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0056] Figure 2 This is an exploded view of a battery device provided in an embodiment of this application;

[0057] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0058] Figure 4 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0059] Figure 5 This is a schematic diagram of a partial cross-sectional structure of a battery cell in the stacking direction according to an embodiment of this application;

[0060] Figure 6 This is a partial structural schematic diagram of the electrode assembly and the first insulating layer of a battery cell provided in an embodiment of this application;

[0061] Figure 7 This is a schematic diagram of a partial cross-sectional structure of a battery cell in the stacking direction provided in another embodiment of this application;

[0062] Figure 8 This is a partial cross-sectional structural diagram of a battery cell in the stacking direction provided in another embodiment of this application;

[0063] Figure 9 This is a partial cross-sectional structural diagram of a battery cell in the stacking direction provided in another embodiment of this application;

[0064] Figure 10 This is a partial structural schematic diagram of the electrode assembly, first insulating layer and second insulating layer of a battery cell provided in an embodiment of this application;

[0065] Figure 11 This is a flowchart of a method for manufacturing a single battery cell according to an embodiment of this application;

[0066] Figure 12 This is a flowchart of a method for manufacturing a battery cell according to another embodiment of this application.

[0067] The accompanying drawings may not be drawn to scale.

[0068] Explanation of reference numerals in the attached figures:

[0069] 1000, vehicles;

[0070] 100. Battery assembly; 200. Controller; 300. Motor;

[0071] 1a. Battery module; 1b. First housing; 1c. Second housing;

[0072] 10. Battery cells;

[0073] 1. Outer shell; 11. Receiving cavity;

[0074] 2. Electrode assembly; 21. First electrode; 211. First body; 212. First tab; 22. Second electrode; 221. Second body; 222. Second tab; 23. Electrolyte layer;

[0075] 3. First insulating layer; 31. First through hole; 32. First part; 33. Second part;

[0076] 4. Second insulating layer; 41. Second through hole; 42. Third part; 43. Fourth part;

[0077] z, stacking direction. Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0079] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0080] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0081] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0082] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0083] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0084] In this application, "multiple" means two or more (including two).

[0085] Currently, judging from market trends, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace, among other fields.

[0086] A battery device typically refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. A battery cell can be the smallest unit that makes up a battery device.

[0087] Solid-state batteries, as a novel energy storage device, consist of positive and negative electrodes and a solid electrolyte. Compared to liquid batteries, solid-state batteries have the advantage of not containing a liquid electrolyte, thus offering higher safety and a longer lifespan. However, lithium-ion transport in solid-state battery cells must occur at the solid-solid interface, making densification an essential step in the manufacturing process. Densification helps improve the ionic conductivity of solid-state battery cells, thereby enhancing their electrochemical performance.

[0088] There are three main methods for achieving densification: rolling, flat pressing, and isostatic pressing. However, in the process of densifying the electrode assembly, the first electrode, the electrolyte layer, and the second electrode are stacked to form an electrode assembly. Due to the high pressure, the edges of the electrode are prone to warping, causing the edges of the first and second electrodes to overlap, which can lead to an internal short circuit in the battery cell and reduce its reliability. The above statements are only used to provide background information related to this application and do not necessarily constitute prior art.

[0089] The battery cell provided in this application has a first electrode and a second electrode stacked along a lamination direction. The first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. The second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body. A portion of the second body protrudes from the outer peripheral surface of the first body. A first insulating layer is disposed on the outer periphery of the first body and connected to the outer peripheral surface of the first body. That is, the edge of the first electrode has a first insulating layer for insulating the first electrode and the second electrode. This reduces the phenomenon of edge warping of the first electrode during the pressurization process of the electrode assembly and effectively suppresses the edge overlap of the first electrode and the second electrode, reducing the occurrence of internal short circuits in the electrode assembly, thereby improving the reliability of the battery cell.

[0090] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0091] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0092] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0093] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0094] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0095] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0096] 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-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0097] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0098] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0099] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0100] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0101] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0102] See Figure 1 As shown, one embodiment of this application provides a vehicle 1000. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. In one embodiment of this application, the vehicle 1000 may include a motor 300, a controller 200, and a battery device 100. The controller 200 is used to control the battery device 100 to supply power to the motor 300. The motor 300 is connected to the wheels via a transmission mechanism, thereby driving the vehicle 1000. The battery device 100 can serve as the driving power source for the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000. In one example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. In one example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system. For example, the battery device 100 can be used to meet the power needs of the vehicle 1000 during startup, navigation and operation.

[0103] Please refer to Figure 2 , Figure 2 Exploded views of battery devices provided in some embodiments of this application.

[0104] In some embodiments, the battery device 100 may include one or more battery cell assemblies for providing voltage and capacity.

[0105] A battery cell assembly may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0106] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0107] As an example, a single battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0108] As an example, a battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0109] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module 1a, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, a battery module 1a can be formed by bundling multiple battery cells together with cable ties.

[0110] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing. As an example, the battery cell assembly may be a battery module 1a, which can be housed within the housing by securing the battery module 1a to the housing. Alternatively, the battery cell assembly may be housed within the housing by directly securing multiple battery cells to the housing.

[0111] In some embodiments, the housing is used to house individual battery cells, and the housing can have various structures.

[0112] In some embodiments, the housing may include a first housing 1b and a second housing 1c, which overlap each other, and together define a receiving space for accommodating a single battery cell. The second housing 1c may be a hollow structure with one open end, and the first housing 1b may be a plate-like structure, with the first housing 1b covering the open side of the second housing 1c so that the first housing 1b and the second housing 1c together define the receiving space. Alternatively, both the first housing 1b and the second housing 1c may be hollow structures with one open side, with the open side of the first housing 1b covering the open side of the second housing 1c. Of course, the housing formed by the first housing 1b and the second housing 1c can be of various shapes, such as a cylinder, a cuboid, etc.

[0113] In some embodiments, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, forming an enclosed space inside the enclosure to house the individual battery cells. As an example, the frame may include multiple side beams.

[0114] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0115] In some embodiments, the battery device 100 may be an energy storage device.

[0116] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0117] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0118] In battery 100, there can be multiple battery cells 10, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 10 is housed within a casing. Alternatively, battery 100 can also consist of multiple battery cells 10 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within a casing. Battery 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 10.

[0119] Each battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., but the embodiments of this application are not limited to this.

[0120] The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0121] The battery cell 10 is a solid-state battery cell, which typically includes a casing and an electrode assembly. The casing has an inner cavity, and the electrode assembly is disposed within the inner cavity. A solid electrolyte is disposed on the electrode plates.

[0122] In some alternative embodiments, the solid electrolyte includes one or more of sulfide solid electrolytes, oxide solid electrolytes, halide solid electrolytes, and polymer solid electrolytes.

[0123] Sulfide solid electrolytes include sulfide crystalline solid electrolytes, sulfide glass, and glass-ceramic solid electrolytes.

[0124] See Figures 3 to 5 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application; Figure 4 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application; Figure 5 This is a schematic diagram of a partial cross-sectional structure of a battery cell in the stacking direction according to an embodiment of this application.

[0125] like Figures 3 to 5 As shown, this application proposes a battery cell 10, which includes a housing 1, an electrode assembly 2, and a first insulating layer 3. The housing 1 has a receiving cavity 11. The electrode assembly 2 is disposed within the receiving cavity 11 and includes a first electrode 21, a second electrode 22, and an electrolyte layer 23. The first electrode 21 and the second electrode 22 have opposite polarities and are stacked along the stacking direction z. The electrolyte layer 23 is used to isolate the first electrode 21 and the second electrode 22. The first electrode 21 includes a first body 211 and a first tab 212 extending from the outer peripheral surface of the first body 211. The second electrode 22 includes a second body 221 and a second tab 222 extending from the outer peripheral surface of the second body 221. A portion of the second body 221 protrudes from the outer peripheral surface of the first body 211. The first insulating layer 3 is disposed along the outer periphery of the first body 211 and connected to the outer peripheral surface of the first body 211. In the stacking direction z, at least a portion of the first insulating layer 3 overlaps with the second body 221.

[0126] The housing 1 has a receiving cavity 11 for accommodating the electrode assembly 2 to form the internal environment of the battery cell 10.

[0127] In some examples, the housing 1 can be of various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 1 can be determined based on the specific shape and size of the electrode assembly 2.

[0128] In some examples, the material of the outer casing 1 can be a variety of materials, such as one or more of copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0129] Optionally, the outer shell 1 is made of a material with a certain degree of hardness and strength, such as aluminum or aluminum alloy, so that the outer shell 1 is not easily deformed when subjected to compression or impact.

[0130] In some examples, the housing 1 includes an end cap and a shell, which can be separate components. An opening can be provided on the shell, and the end cap can be closed at the opening to form the internal environment of the battery cell 10. Alternatively, the end cap and shell can be integrated. Specifically, the end cap and shell can form a common connection surface before other components are inserted into the shell, and the end cap can be closed when it is necessary to encapsulate the interior of the shell.

[0131] Electrode assembly 2 is the component in battery cell 10 where electrochemical reactions occur.

[0132] In some examples, the housing 1 may contain one or more electrode assemblies 2.

[0133] In some examples, the electrode assembly 2 includes a plurality of first electrodes 21, a plurality of second electrodes 22, and a plurality of electrolyte layers 23. The first electrodes 21 and the second electrodes 22 have opposite polarities. The plurality of first electrodes 21 and the plurality of second electrodes 22 are stacked along the stacking direction z. The electrolyte layers 23 are used to isolate the first electrodes 21 and the second electrodes 22. The first electrodes 21 are located at both ends of the stacking direction z. The electrolyte layer 23 is provided on the side of the first electrode 21 located at one end that is away from the second electrode 22.

[0134] In some examples, the shape of the outer peripheral surface of the first body 211 is the same as the shape of the outer peripheral surface of the second body 221.

[0135] For example, both the first body 211 and the second body 221 are rectangular, with the two long sides of the first body 211 corresponding to the two long sides of the second body 221, and the two short sides of the first body 211 corresponding to the two short sides of the second body 221.

[0136] In some examples, the first electrode 21 includes a first body 211 and a first tab 212 extending from the outer peripheral surface of the first body 211. The portion of the first electrode 21 having active material constitutes the first body 211, and the portion of the first electrode 21 not having active material constitutes the first tab 212.

[0137] In some examples, the second electrode 22 includes a second body 221 and a second tab 222 extending from the outer peripheral surface of the second body 221. The portion of the second electrode 22 having active material constitutes the body of the electrode assembly 2, and the portion of the second electrode 22 without active material constitutes the second tab 222.

[0138] One of the first electrode 21 and the second electrode 22 is a positive electrode, and the other is a negative electrode.

[0139] In some examples, the first tab 212 and the second tab 222 may be located together at one end of the electrode assembly 2 or at both ends of the electrode assembly 2, respectively. Exemplarily, during the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte layer 23, and the tabs connect the electrode terminals to form a current loop.

[0140] In some examples, a portion of the outer peripheral surface of the second body 221 protrudes beyond the outer peripheral surface of the first body 211. For example, the first body 211 and the second body 221 are rectangular in structure. The side of the non-tab of the second body 221 protrudes beyond the side of the non-tab of the first body 211. One side of the first tab 212 extending from the first body 211 is flush with one side of the second tab 222 extending from the second body 221.

[0141] In other examples, the outer peripheral surface of the second body 221 protrudes beyond the outer peripheral surface of the first body 211. For example, the first body 211 and the second body 221 have a rectangular structure, and all four sides of the second body 221 extend beyond the four sides of the first body 211.

[0142] The first insulating layer 3 is disposed along the outer periphery of the first body 211 and connected to the outer periphery of the first body 211. It is used to insulate the first electrode 21 and the second electrode 22, so that the first body 211 is protected during the pressurization process of the electrode assembly 2, and the stacking stress on the edge of the second body 221 is absorbed. This can reduce the phenomenon of the edge of the first electrode 21 lifting. Furthermore, due to the barrier of the first insulating layer 3, the edge overlap of the first electrode 21 and the second electrode 22 is effectively suppressed, and the occurrence of internal short circuits in the electrode assembly 2 is reduced.

[0143] In some examples, at least a portion of the first insulating layer 3 is fixedly connected to the outer peripheral surface of the first body 211; alternatively, at least a portion of the first insulating layer 3 is detachably connected to the outer peripheral surface of the first body 211.

[0144] For example, the first insulating material is prepared into a slurry, coated onto the surface of the substrate by brushing, spraying, or screen printing, and then cured to form the first insulating layer 3, which is then connected to the outer peripheral surface of the first body 211. Alternatively, the first insulating layer 3 is coated onto the outer peripheral surface of the first body 211 by brushing, spraying, or screen printing and then cured to form the first insulating layer 3.

[0145] In some examples, the first insulating layer 3 is disposed along the outer periphery of the first body 211, and the first insulating layer 3 may be disposed on a portion of the outer peripheral surface of the first body 211 to protect a portion of the first body 211.

[0146] In other examples, the first insulating layer 3 is disposed around the outer perimeter of the first body 211 and avoids the first tab 212, in order to provide more effective protection for the first body 211.

[0147] In some examples, the first insulating layer 3 is attached to the outer peripheral surface of the first body 211, and the first insulating layer 3 is sandwiched between two adjacent second bodies 221. By way of example, in the direction perpendicular to the stacking direction z, the first insulating layer 3 does not extend beyond the second body 221; alternatively, in the direction perpendicular to the stacking direction z, a portion of the first insulating layer 3 extends beyond the second body 221.

[0148] The battery cell 10 provided in this application has a first electrode 21 and a second electrode 22 stacked along the stacking direction z. The first electrode 21 includes a first body 211 and a first tab 212 extending from the outer peripheral surface of the first body 211. The second electrode 22 includes a second body 221 and a second tab 222 extending from the outer peripheral surface of the second body 221. A portion of the second body 221 protrudes from the outer peripheral surface of the first body 211. A first insulating layer 3 is disposed on the outer periphery of the first body 211 and connected to the outer peripheral surface of the first body 211. That is, the edge of the first electrode 21 is provided with a first insulating layer 3 for insulating the first electrode 21 and the second electrode 22. This reduces the phenomenon of the edge of the first electrode 21 lifting during the pressurization process of the electrode assembly 2, effectively suppresses the edge overlap of the first electrode 21 and the second electrode 22, reduces the occurrence of internal short circuits in the electrode assembly 2, and improves the reliability of the battery cell 10. Furthermore, the first insulating layer 3, which overlaps with the second electrode 22 on the outer peripheral surface of the first body 211, provides some support for the second electrode 22, reducing the likelihood of the edge of the second electrode 22 lifting up during pressurization, thereby further reducing the probability of the first electrode 21 and the second electrode 22 overlapping. Additionally, the overlap of the first insulating layer 3 with the second electrode 22 on the outer peripheral surface of the first body 211, with at least a portion of the first insulating layer 3 filling the gap between the two second bodies 221, saves the extra space occupied by the first insulating layer 3, optimizes space utilization, and makes the overall structure more compact, which is beneficial for the miniaturization design of the battery cell 10.

[0149] See also Figure 6 and Figure 7 , Figure 6 This is a partial structural schematic diagram of the electrode assembly and the first insulating layer of a battery cell provided in an embodiment of this application; Figure 7 This is a schematic diagram of a partial cross-sectional structure of a battery cell in the stacking direction provided in another embodiment of this application.

[0150] According to one embodiment of this application, such as Figure 5 , Figure 6 and Figure 7 As shown, the first insulating layer 3 is disposed around the first body 211, and the first insulating layer 3 is provided with a first through hole 31, and a part of the first electrode tab 212 is accommodated in the first through hole 31.

[0151] Exemplarily, the first body 211 is generally rectangular in shape, and the first insulating layer 3 is generally rectangular in shape surrounding the first body 211. The first body 211 includes two long sides and two short sides, one of which is connected to the first electrode tab 212. The first insulating layer 3 includes two long frame sides and two short frame sides, with each of the two long frame sides corresponding to one of the two long sides and each of the two short frame sides corresponding to one of the two short sides. One of the two short frame sides is provided with a first through hole 31, and a portion of the first electrode tab 212 is accommodated in the first through hole 31 and extends out of the first through hole 31.

[0152] In these alternative embodiments, the first insulating layer 3 is disposed around the first body 211, which can more effectively reduce the risk of lap short circuits. Moreover, the first insulating layer 3 can uniformly support the first electrode 21, further reducing the deformation of the edge of the first electrode 21.

[0153] According to one embodiment of this application, such as Figure 5 and Figure 6 As shown, in the stacking direction z, the outer peripheral surface of the first body 211 is flush with the outer peripheral surface of the electrolyte layer 23. A portion of the first insulating layer 3 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0154] The outer peripheral surface of the first body 211 is flush with the outer peripheral surface of the electrolyte layer 23, that is, a part of the second body 221 protrudes from the outer peripheral surface of the electrolyte layer 23.

[0155] In some examples, the first electrode 21 has an electrolyte layer 23 on both sides along the stacking direction z, and the outer peripheral surface of the first body 211 is flush with the outer peripheral surface of the electrolyte layer 23.

[0156] For example, in the stacking direction z, an electrolyte layer 23, a first electrode 21, and another electrolyte layer 23 are sequentially provided. A portion of the first insulating layer 3 is disposed along the outer periphery of the first body 211 and connected to the outer peripheral surface of the first body 211, and another portion is connected to at least a portion of the outer peripheral surfaces of the two electrolyte layers 23.

[0157] Electrolyte slurry is coated on the two opposing surfaces of the first body 211, and the electrolyte slurry is cured to form an electrolyte layer 23.

[0158] In these optional embodiments, a portion of the first insulating layer 3 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23. On the one hand, the first insulating layer 3 can further fill the gap between two adjacent second bodies 221, which is beneficial to improving the overall structural stability of the electrode assembly 2. On the other hand, the connection between the first insulating layer 3 and the electrolyte layer 23 improves the connection stability of the first insulating layer 3 and reduces the risk of the first insulating layer 3 detaching from the electrode assembly 2. Moreover, during the charging and discharging process of the battery cell 10, the volume of the first electrode 21 and the second electrode 22 is prone to expansion and contraction. The first insulating layer 3, through mechanical support, can limit the excessive expansion or contraction of the volume of the first electrode 21 and the second electrode 22, reducing the deformation of the electrode assembly 2. That is, the connection of the first insulating layer 3 to the electrolyte layer 23 can not only improve the connection stability and reduce the risk of detachment, but also provide mechanical support to limit the deformation of the first electrode 21 and the second electrode 22.

[0159] See also Figure 8 , Figure 8 This is a schematic diagram of a partial cross-sectional structure of a battery cell in the stacking direction, provided in another embodiment of this application.

[0160] According to one embodiment of this application, such as Figure 5 and Figure 8 As shown, the first insulating layer 3 includes a first part 32 and two second parts 33. The first part 32 is connected to the outer peripheral surface of the first body 211, and the two second parts 33 are located on both sides of the first part 32. The two second parts 33 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0161] For example, the first insulating layer 3 includes a first portion 32 and two second portions 33. The first portion 32 is connected to the outer peripheral surface of the first body 211, and the two second portions 33 are respectively located on both sides of the first portion 32. The two second portions 33 are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23, and the second portions 33 abut against the second body 221 away from the starting surface of the first portion 32.

[0162] In some examples, the second portion 33 overlaps at least partially with the electrolyte layer 23 in a direction perpendicular to the stacking direction z. This can be understood as the second portion 33 overlapping a portion of the electrolyte layer 23 in a direction perpendicular to the stacking direction z, or the second portion 33 overlapping the electrolyte layer 23.

[0163] Optionally, the first insulating layer 3 is located between two adjacent first bodies 211.

[0164] Optionally, the first main body 211 is provided with electrolyte layers 23 on both sides along the stacking direction z, and the first main body 211 and the two electrolyte layers 23 are an integral structure.

[0165] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the first body 211.

[0166] In these alternative embodiments, the first insulating layer 3 is configured to bond tightly to the electrode assembly 2, thereby further improving the overall structural stability of the battery cell 10.

[0167] According to one embodiment of this application, such as Figure 5 and Figure 8 As shown, in the stacking direction z, the side of the second part 33 facing away from the first part 32 is flush with the side of the electrolyte layer 23 facing away from the first body 211.

[0168] For example, the second part 33 includes a first surface facing the electrolyte layer 23 and a second surface facing the second body 221, the first surface and the second surface are connected, the first surface is connected to the outer peripheral surface of the electrolyte layer 23, and the second surface is connected to the surface of the second body 221 facing the second body 221 along the stacking direction z.

[0169] In these alternative embodiments, a tight structure between the first insulating layer 3 and the electrode body can be achieved, reducing the phenomenon of the edges of the first electrode 21 and the second electrode 22 lifting up during subsequent pressurization, and effectively reducing the occurrence of internal short circuits.

[0170] See also Figure 9 , Figure 9 This is a partial cross-sectional structural diagram of a battery cell in the stacking direction provided in another embodiment of this application.

[0171] According to one embodiment of this application, such as Figure 8 and Figure 9 As shown, the battery cell 10 also includes a second insulating layer 4, which is disposed along the outer periphery of the second body 221 and connected to the second body 221.

[0172] For example, the second insulating material is prepared into a slurry, coated onto the surface of the substrate by brushing, spraying, or screen printing, and then cured to form the second insulating layer 4, which is then connected to the outer peripheral surface of the second body 221. Alternatively, the second insulating layer 4 is coated onto the outer peripheral surface of the second body 221 by brushing, spraying, or screen printing and then cured to form the second insulating layer 4.

[0173] In some examples, the second insulating layer 4 is disposed along the outer periphery of the second body 221, and the second insulating layer 4 may be disposed on a portion of the outer peripheral surface of the second body 221 to protect a portion of the second body 221.

[0174] In other examples, the second insulating layer 4 is disposed around the outer perimeter of the second body 221 and avoids the second tab 222, in order to provide more effective protection for the second body 221.

[0175] In some examples, the second insulating layer 4 does not extend beyond the second body 221 in the stacking direction z; alternatively, at least one end of the second insulating layer 4 extends beyond the second body 221 in the stacking direction z.

[0176] For example, the second insulating layer 4 includes a first substrate and a second substrate. The first substrate is disposed along the outer periphery of the second body 221 and connected to the second body 221. The second substrate protrudes from the first substrate along the lamination direction z, and the second substrate is spaced apart from the second insulating layer 4, or the second substrate is connected to the second insulating layer 4.

[0177] In these alternative embodiments, the outer peripheral surface of the second body 221 is provided with a second insulating layer 4, achieving dual protection of the first insulating layer 3 and the second insulating layer 4, reducing the possibility of edge contact. This dual insulation protection reduces the risk of short circuits. Furthermore, during pressurization, the first insulating layer 3 and the second insulating layer 4 can better absorb mechanical stress, reducing the occurrence of warping at the edges of the first electrode 21 and the second electrode 22. In addition, the independent arrangement of the first insulating layer 3 and the second insulating layer 4 allows for a larger process tolerance and reduces manufacturing difficulty.

[0178] See also Figure 10 , Figure 10 This is a partial structural schematic diagram of the electrode assembly, first insulating layer, and second insulating layer of a battery cell provided in an embodiment of this application.

[0179] According to one embodiment of this application, such as Figure 10 As shown, the second insulating layer 4 is disposed around the second body 221, and the second insulating layer 4 is provided with a second through hole 41, a portion of the second tab 222 is accommodated in the second through hole 41.

[0180] For example, the second body 221 is generally rectangular in shape, and the second insulating layer 4 is generally rectangular in shape surrounding the second body 221. The second body 221 includes two long sides and two short sides, one of which is connected to the second tab 222. The second insulating layer 4 includes two long frame sides and two short frame sides, with each of the two long frame sides corresponding to one of the two long sides and each of the two short frame sides corresponding to one of the two short sides. One of the two short frame sides is provided with a second through hole 41, and a portion of the second tab 222 is accommodated in the second through hole 41 and extends out of the second through hole 41.

[0181] In these alternative embodiments, the second insulating layer 4 is disposed around the second body 221, which can more effectively reduce the risk of lap short circuits. Moreover, the second insulating layer 4 can uniformly absorb the stress of the second body 221, reducing the occurrence of warping at the edge of the second electrode 22.

[0182] According to one embodiment of this application, such as Figure 9 As shown, in the stacking direction z, the outer peripheral surface of the second body 221 is flush with the outer peripheral surface of the electrolyte layer 23. A portion of the second insulating layer 4 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0183] The outer peripheral surface of the second body 221 is flush with the outer peripheral surface of the electrolyte layer 23, that is, a part of the first body 211 protrudes from the outer peripheral surface of the electrolyte layer 23.

[0184] In some examples, the second electrode 22 has an electrolyte layer 23 on both sides along the stacking direction z, and the outer peripheral surface of the second body 221 is flush with the outer peripheral surface of the electrolyte layer 23.

[0185] For example, in the stacking direction z, an electrolyte layer 23, a second electrode 22, and another electrolyte layer 23 are sequentially provided. A portion of the second insulating layer 4 is disposed along the outer periphery of the second body 221 and connected to the outer peripheral surface of the second body 221, and another portion is connected to at least a portion of the outer peripheral surfaces of the two electrolyte layers 23.

[0186] Electrolyte slurry is coated on the two opposing surfaces of the second body 221, and the electrolyte slurry is cured to form an electrolyte layer 23.

[0187] In these alternative embodiments, the second insulating layer 4 is connected to the electrolyte layer 23, improving the connection stability of the second insulating layer 4 and reducing the risk of the second insulating layer 4 detaching from the electrode assembly 2. Moreover, by sandwiching the second body 221 in the middle through the electrolyte layer 23 and the second insulating layer 4, the excessive expansion or contraction of the first electrode 21 during the charging and discharging of the battery cell 10 can be effectively limited, reducing the deformation of the electrode assembly 2.

[0188] According to one embodiment of this application, such as Figure 9 As shown, the second insulating layer 4 includes a third part 42 and two fourth parts 43. The third part 42 is connected to the outer peripheral surface of the second body 221, and the two fourth parts 43 are located on both sides of the third part 42. The two second parts 33 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0189] For example, the second insulating layer 4 includes a third portion 42 and two fourth portions 43. The third portion 42 is connected to the outer peripheral surface of the second body 221, and the two fourth portions 43 are located on both sides of the third portion 42. The two fourth portions 43 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23, and the second portion 33 abuts against the second body 221 away from the first portion 32.

[0190] In some examples, the fourth portion 43 overlaps at least partially with the electrolyte layer 23 in a direction perpendicular to the stacking direction z. This can be understood as either the fourth portion 43 overlapping a portion of the electrolyte layer 23 in a direction perpendicular to the stacking direction z, or the fourth portion 43 overlapping the entire electrolyte layer 23.

[0191] Optionally, the second main body 221 is provided with electrolyte layers 23 on both sides along the stacking direction z, and the second main body 221 and the two electrolyte layers 23 are an integral structure.

[0192] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the second body 221.

[0193] In these alternative embodiments, the second insulating layer 4 is configured to bond tightly to the electrode assembly 2, thereby further improving the overall structural stability of the battery cell 10.

[0194] According to one embodiment of this application, such as Figure 9 As shown, in the direction perpendicular to the stacking direction z, the side of the fourth part 43 facing away from the third part 42 is flush with the side of the electrolyte layer 23 facing away from the second body 221.

[0195] Exemplarily, the electrolyte layer 23 has opposing first and second surfaces along the stacking direction z, with the first surface facing the second body 221 and the second surface facing the first body 211. A fourth portion 43 is connected to the electrolyte layer 23. The fourth portion 43 has opposing third and fourth surfaces along the stacking direction z, with the third surface facing the third portion 42 and the fourth surface facing away from the third portion 42. In a direction perpendicular to the stacking direction z, the first and third surfaces are flush, and the second and fourth surfaces are flush.

[0196] In these alternative embodiments, this arrangement allows the second insulating layer 4 to more effectively protect the electrolyte layer 23. It also ensures a stable connection of the second insulating layer 4.

[0197] According to one embodiment of this application, such as Figure 8 and Figure 9 As shown, in the direction perpendicular to the stacking direction z, the first insulating layer 3 does not extend beyond the second insulating layer 4.

[0198] In some examples, the second insulating layer 4 protrudes from the first insulating layer 3 in a direction perpendicular to the stacking direction z.

[0199] For example, in the stacking direction z, the outer peripheral surface of the first insulating layer 3 is flush with the outer peripheral surface of the first body 211.

[0200] For example, in a direction perpendicular to the stacking direction z, the first body 211 protrudes from the first insulating layer 3.

[0201] In other examples, the outer peripheral surface of the first insulating layer 3 is flush with the outer peripheral surface of the second insulating layer 4 in the stacking direction z.

[0202] In some examples, the first insulating layer 3 is coated or bonded to the first body 211.

[0203] In some examples, the second insulating layer 4 is coated or bonded to the second body 221.

[0204] In these alternative embodiments, the first insulating layer 3 and the second insulating layer 4 are not flush, which reduces the positional accuracy requirements for the first insulating layer 3 and the second insulating layer 4, making it easier to assemble them. Furthermore, while addressing the issue of overlapping between the first electrode 21 and the second electrode 22, the use of insulating components can be appropriately reduced to lower manufacturing costs.

[0205] According to one embodiment of this application, such as Figure 8 As shown, in the direction perpendicular to the stacking direction z, the size of the first insulating layer 3 is larger than the size of the second insulating layer 4.

[0206] In these alternative embodiments, the size of the first insulating layer 3 is larger than the size of the second insulating layer 4 in the direction perpendicular to the stacking direction z, so that the first insulating layer 3 can fully fill the gap between the two second bodies 221 to provide stable support for the second bodies 221 and reduce the phenomenon of the edge of the second electrode 22 lifting.

[0207] According to one embodiment of this application, the first electrode 21 is a positive electrode and the second electrode 22 is a negative electrode.

[0208] In some examples, the thickness of the negative electrode is 100 μm to 500 μm, the thickness of the positive electrode is 100 μm to 500 μm, and the thickness of the electrolyte layer 23 is 5 μm to 100 μm.

[0209] For example, the thickness of the negative electrode is 100 μm to 150 μm, the thickness of the positive electrode is 120 μm to 180 μm, and the thickness of the electrolyte layer 23 is 15 μm to 25 μm.

[0210] According to one embodiment of this application, both the first insulating layer 3 and the second insulating layer 4 include an adhesive. The adhesive for the first insulating layer 3 includes one or more of polypropylene, polyethylene, and polycarbonate, and the adhesive for the second insulating layer 4 includes polystyrene.

[0211] For example, the first electrode 21 is a positive electrode, and the adhesive for the first insulating layer 3 includes one or more of polypropylene, polyethylene, and polycarbonate. These specifically optional adhesives, when applied to the positive electrode, can improve the reduction resistance of the positive electrode.

[0212] For example, the second electrode 22 is a negative electrode, and the adhesive for the second insulating layer 4 includes polystyrene. Specific optional adhesives applied to the negative electrode can improve its oxidation resistance.

[0213] In these alternative embodiments, both the first insulating layer 3 and the second insulating layer 4 include an adhesive, which increases the adhesion between the first insulating layer 3 and the second insulating layer 4, thereby improving the connection stability between the first insulating layer 3 and the first electrode 21, and improving the connection stability between the second insulating layer 4 and the second electrode 22. Furthermore, the use of the adhesive gives the first insulating layer 3 and the second insulating layer 4 a certain degree of flexibility, allowing them to adapt to volume changes in the first electrode 21 and the second electrode 22 during pressurization and charging / discharging processes. They can also buffer stress through their own deformation, thereby improving the overall stability of the battery cell 10.

[0214] According to one embodiment of this application, the first insulating layer 3 includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

[0215] In some examples, the second insulating layer 4 includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer and a modified alumina layer, and a compression-molded polymer layer.

[0216] Optionally, the first insulating layer 3 is a modified alumina layer, which has high strength and low modulus.

[0217] Optionally, the first insulating layer 3 is a compression-molded polymer layer.

[0218] For example, the compression polymer may comprise a mixture of at least two materials selected from the following: polystyrene (PS), polyisoprene (PI), poly(n-butyl acrylate) (PBA), poly(2-ethylhexyl acrylate) (PEHA), poly(amyl methacrylate) (PPMA), poly(butyl methacrylate) (PBMA), polycarbonate (PC), poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC), poly(ethyl acrylate) (PEA), poly(ethyl methacrylate) (PEMA), and polybutadiene (PB).

[0219] Since the compression-molded polymer is shaped during the compression process, if the first body 211, the second body 221 or the electrolyte layer 23 may break under pressure, the compression-molded polymer and the broken material are shaped together to form the first insulating layer 3.

[0220] According to one embodiment of this application, the first insulating layer is a porous insulating layer or a honeycomb insulating layer.

[0221] In some examples, the second insulating layer 4 is a porous insulating layer or a honeycomb insulating layer.

[0222] In these alternative embodiments, these specific alternative embodiments, the first insulating layer has a high stress dispersion efficiency.

[0223] According to one embodiment of this application, the thickness of the first insulating layer is from 5 μm to 500 μm.

[0224] In some examples, the thickness of the second insulating layer is from 5 μm to 500 μm.

[0225] Optionally, the thickness of the first insulating layer is 5 μm to 100 μm.

[0226] Alternatively, the thickness of the first insulating layer is 5 μm to 50 μm.

[0227] Alternatively, the thickness of the first insulating layer is 5 μm to 10 μm.

[0228] In these alternative embodiments, the first insulating layer has a suitable thickness, which can effectively suppress the edge overlap of the first electrode 21 and the second electrode 22, and also appropriately reduce its proportion inside the battery cell 10, saving internal space of the battery cell 10.

[0229] See Figure 11 , Figure 11 This is a flowchart of a method for manufacturing a battery cell according to an embodiment of this application.

[0230] like Figure 11 As shown, in a second aspect, this application provides a method for manufacturing a single battery cell, comprising:

[0231] Step S100: Provide the first insulating layer.

[0232] Step S200: Provide a first electrode, wherein the first electrode includes a first body and a first electrode tab extending from the outer peripheral surface of the first body.

[0233] Step S300: Cover at least a portion of the first body with the first insulating layer from the outside.

[0234] Step S400: Provide a second electrode and an electrolyte layer, wherein the first electrode and the second electrode have opposite polarities, the second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body, and a portion of the second body protrudes from the outer peripheral surface of the first body.

[0235] Step S500: The first electrode and the second electrode with the first insulating layer are alternately arranged along the stacking direction, such that at least a portion of the first insulating layer overlaps with the second body, and the first electrode and the second electrode are isolated by an electrolyte layer to form an electrode assembly with the first insulating layer.

[0236] Step S600: Apply pressure to the first insulating layer and electrode assembly.

[0237] Step S700: Install the first insulating layer and electrode assembly into the housing.

[0238] In some examples, the manufacturing method of a single battery cell also includes providing a second insulating layer.

[0239] In some examples, step S400 is followed by: covering at least a portion of the second body with a second insulating layer from the outside.

[0240] In some examples, a first electrode having a first insulating layer and a second electrode having a second insulating layer are alternately arranged along the stacking direction such that at least a portion of the first insulating layer overlaps with the second body, and an electrolyte layer is used to isolate the first electrode and the second electrode to form an electrode assembly having a first insulating layer and a second insulating layer.

[0241] In some examples, pressure is applied to the first insulating layer, the second insulating layer, and the electrode assembly.

[0242] In some examples, the first insulating layer, the second insulating layer, and the electrode assembly are mounted inside the housing.

[0243] See Figure 12 , Figure 12 This is a flowchart of a method for manufacturing a battery cell according to another embodiment of this application.

[0244] like Figure 12 As shown, in a third aspect, this application provides a method for manufacturing a single battery cell, comprising:

[0245] Step S100': Provide the first insulating layer.

[0246] Step S200': Provide an electrode assembly, wherein the electrode assembly includes a first electrode, multiple electrodes, and an electrolyte layer. The first electrode and the second electrode have opposite polarities and are alternately arranged along the stacking direction. The electrolyte layer is used to isolate the first electrode and the second electrode. The first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. The second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body. A portion of the first body protrudes from the outer peripheral surface of the second body.

[0247] Step S300': The first insulating layer covers at least a portion of the first body from the outside, such that at least a portion of the first insulating layer overlaps with the second body.

[0248] Step S400': Apply pressure to the first insulating layer and electrode assembly.

[0249] Step S500': Install the first insulating layer and electrode assembly into the housing.

[0250] In some examples, the manufacturing method of a single battery cell also includes providing a second insulating layer.

[0251] In some examples, step S300' is followed by: covering at least a portion of the second body with a second insulating layer from the outside.

[0252] In some examples, pressure is applied to the first insulating layer, the second insulating layer, and the electrode assembly.

[0253] In some examples, the first insulating layer, the second insulating layer, and the electrode assembly are mounted inside the housing.

[0254] Fourthly, this application provides a battery device including the aforementioned battery cell.

[0255] Fifthly, this application provides an electrical device, including a battery cell or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0256] According to some embodiments of this application, see Figure 3 , Figure 4 , Figure 6 , Figure 8 and Figure 10 The battery cell 10 includes a casing 1, an electrode assembly 2, and a first insulating layer 3.

[0257] The outer casing 1 has a receiving cavity 11.

[0258] Electrode assembly 2 is disposed within receiving cavity 11. Electrode assembly 2 includes a first electrode 21, a second electrode 22, and an electrolyte layer 23. The first electrode 21 and the second electrode 22 have opposite polarities and are stacked along the stacking direction z. The electrolyte layer 23 is used to isolate the first electrode 21 and the second electrode 22. The first electrode 21 includes a first body 211 and a first tab 212 extending from the outer peripheral surface of the first body 211. The second electrode 22 includes a second body 221 and a second tab 222 extending from the outer peripheral surface of the second body 221. A portion of the second body 221 protrudes from the outer peripheral surface of the first body 211. The first electrode 21 is a positive electrode, and the second electrode 22 is a negative electrode.

[0259] A first insulating layer 3 is disposed around and connected to the outer peripheral surface of the first body 211. In the lamination direction z, at least a portion of the first insulating layer 3 overlaps with the second body 221. The first insulating layer 3 has a first through-hole 31, and a portion of the first tab 212 is accommodated in the first through-hole 31. In the lamination direction z, the outer peripheral surface of the first body 211 is flush with the outer peripheral surface of the electrolyte layer 23. The first insulating layer 3 includes a first portion 32 and two second portions 33. The first portion 32 is connected to the outer peripheral surface of the first body 211, and the two second portions 33 are respectively located on both sides of the first portion 32 and are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23. In the lamination direction z, the side of the second portion 33 facing away from the first portion 32 is flush with the side of the electrolyte layer 23 facing away from the first body 211. The thickness of the first insulating layer is 5 μm to 500 μm. The first insulating layer 3 includes an adhesive, which includes one or more of polypropylene, polyethylene, and polycarbonate.

[0260] A second insulating layer 4 is disposed around and connected to the second body 221. The second insulating layer 4 has a second through-hole 41, and a portion of the second tab 222 is accommodated in the second through-hole 41. In a direction perpendicular to the lamination direction z, the first insulating layer 3 does not extend beyond the second insulating layer 4. In the same direction, the size of the first insulating layer 3 is larger than the size of the second insulating layer 4. The adhesive for the second insulating layer 4 comprises polystyrene. The thickness of the second insulating layer is from 5 μm to 500 μm.

[0261] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly is disposed within the receiving cavity. The electrode assembly includes a first electrode, a second electrode, and an electrolyte layer. The first electrode and the second electrode have opposite polarities and are stacked along a stacking direction. The electrolyte layer is used to isolate the first electrode and the second electrode. The first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. The second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body. A portion of the second body protrudes from the outer peripheral surface of the first body. A first insulating layer is disposed along the outer periphery of the first body and connected to the outer peripheral surface of the first body, wherein at least a portion of the first insulating layer overlaps with the second body in the stacking direction.

2. The battery cell according to claim 1, characterized in that, The first insulating layer is disposed around the first body, and the first insulating layer has a first through hole, a portion of the first electrode tab is accommodated in the first through hole.

3. The battery cell according to claim 1, characterized in that, In the stacking direction, the outer peripheral surface of the first body and the outer peripheral surface of the electrolyte layer are flush. A portion of the first insulating layer is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

4. The battery cell according to claim 3, characterized in that, The first insulating layer includes a first part and two second parts. The first part is connected to the outer peripheral surface of the first body, and the two second parts are respectively located on both sides of the first part. The two second parts are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

5. The battery cell according to claim 4, characterized in that, In the stacking direction, the side of the second portion opposite to the first portion is flush with the side of the electrolyte layer opposite to the first body.

6. The battery cell according to claim 1, characterized in that, The battery cell further includes a second insulating layer, which is disposed along the outer periphery of the second body and connected to the second body.

7. The battery cell according to claim 6, characterized in that, The second insulating layer is disposed around the second body, and the second insulating layer has a second through hole, a portion of the second electrode tab is accommodated in the second through hole.

8. The battery cell according to claim 6, characterized in that, In the stacking direction, the outer peripheral surface of the second body and the outer peripheral surface of the electrolyte layer are flush. A portion of the second insulating layer is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

9. The battery cell according to claim 6, characterized in that, The second insulating layer includes a third part and two fourth parts. The third part is connected to the outer peripheral surface of the second body, and the two fourth parts are located on both sides of the third part. The two second parts are connected to the outer peripheral surfaces of two adjacent electrolyte layers.

10. The battery cell according to claim 9, characterized in that, In a direction perpendicular to the stacking direction, the side of the fourth portion opposite to the third portion is flush with the side of the electrolyte layer opposite to the second body.

11. The battery cell according to claim 6, characterized in that, In a direction perpendicular to the stacking direction, the first insulating layer does not extend beyond the second insulating layer.

12. The battery cell according to claim 6, characterized in that, In a direction perpendicular to the stacking direction, the size of the first insulating layer is larger than the size of the second insulating layer.

13. The battery cell according to claim 6, characterized in that, The first electrode is the positive electrode, and the second electrode is the negative electrode.

14. The battery cell according to claim 13, characterized in that, Both the first insulating layer and the second insulating layer include an adhesive. The adhesive for the first insulating layer includes one or more of polypropylene, polyethylene, and polycarbonate, and the adhesive for the second insulating layer includes polystyrene.

15. The battery cell according to claim 1, characterized in that, The first insulating layer includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

16. The battery cell according to claim 1, characterized in that, The first insulating layer is a porous insulating layer or a honeycomb insulating layer.

17. The battery cell according to claim 1, characterized in that, The thickness of the first insulating layer is 5 μm to 500 μm.

18. A method for manufacturing a single battery cell, characterized in that, include: Provide the first insulating layer; A first electrode is provided, wherein the first electrode includes a first body and a first electrode tab extending from the outer peripheral surface of the first body; The first insulating layer covers at least a portion of the first body from the outside; A second electrode and an electrolyte layer are provided, wherein the first electrode and the second electrode have opposite polarities, the second electrode includes a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the second body protruding from the outer peripheral surface of the first body; A first electrode and a second electrode having the first insulating layer are alternately arranged along the stacking direction, such that at least a portion of the first insulating layer overlaps with the second body, and the first electrode and the second electrode are isolated by the electrolyte layer to form an electrode assembly having the first insulating layer. Pressure is applied to the first insulating layer and the electrode assembly; The first insulating layer and the electrode assembly are installed inside the housing.

19. A method for manufacturing a single battery cell, characterized in that, include: Provide the first insulating layer; An electrode assembly is provided, wherein the electrode assembly includes a first electrode, multiple second electrodes, and an electrolyte layer, the first electrode and the second electrode having opposite polarities, the first electrode and the second electrode being alternately arranged along a stacking direction, the electrolyte layer being used to isolate the first electrode and the second electrode, the first electrode including a first body and a first tab extending from the outer peripheral surface of the first body, the second electrode including a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the second body protruding from the outer peripheral surface of the first body; The first insulating layer covers at least a portion of the first body from the outside, such that at least a portion of the first insulating layer overlaps with the second body; Pressure is applied to the first insulating layer and the electrode assembly; The first insulating layer and the electrode assembly are installed inside the housing.

20. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 17.

21. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 17 or a battery device according to claim 20, wherein the battery cell or the battery device is used to store or provide electrical energy.

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