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

Abstract

The application provides a battery monomer, a manufacturing method thereof, a battery device and a power utilization device. The battery monomer comprises a shell. An electrode assembly comprises a plurality of first pole pieces, a plurality of second pole pieces and an electrolyte layer. The plurality of first pole pieces and the plurality of second pole pieces are alternately stacked along a stacking direction. The first pole piece comprises a first main body and a first pole lug. The second pole piece comprises a second main body and a second pole lug. A part of the first main body protrudes from the outer circumferential surface of the second main body. An insulation assembly comprises a plurality of first insulation parts and a plurality of second insulation parts. The plurality of first insulation parts and the plurality of second insulation parts are alternately arranged along the stacking direction. The first insulation part is arranged along the outer circumference of the first main body. The second insulation part is arranged along the outer circumference of the second main body. The second insulation part protrudes from the surface of the first main body towards the first insulation part. A part of the second insulation part is located between the adjacent first main bodies. The battery monomer provided by the application effectively suppresses 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, comprising a housing electrode assembly, an electrode assembly, and an insulating assembly. The housing has a receiving cavity. The electrode assembly is disposed within the receiving cavity and includes a plurality of first electrodes, a plurality of second electrodes, and an electrolyte layer. The first and second electrodes have opposite polarities. The plurality of first and second electrodes are alternately stacked along a stacking direction. The electrolyte layer is used to isolate the first and second electrodes. Each first electrode includes a first body and a first tab extending from the outer peripheral surface of the first body. Each 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. The insulating assembly includes a plurality of first insulating portions and a plurality of second insulating portions, which are alternately arranged along the stacking direction. The first insulating portions are disposed along the outer periphery of the first body, and the second insulating portions are disposed along the outer periphery of the second body. The second insulating portions protrude from the surface of the first insulating portions facing the first body. In the stacking direction, a portion of the second insulating portion is located between adjacent first bodies.

[0006] The battery cell provided in this application has a first insulating portion disposed on the outer periphery of a first body, and a second insulating portion disposed on the outer periphery of a second body. This achieves dual protection of the first and second insulating portions, providing insulation between the first and second electrodes. This reduces the likelihood of edge warping of the first and second electrodes during the pressurization process of the electrode assembly, effectively suppresses edge overlap between the first and second electrodes, and reduces the occurrence of internal short circuits in the electrode assembly, thereby improving the reliability of the battery cell. Furthermore, a portion of the second insulating portion is located between adjacent first bodies, providing support to the first bodies and absorbing stacking stress during pressurization, improving the structural stability of the second body, further reducing edge warping of the second electrodes, decreasing the probability of overlap between the first and second electrodes, and improving the performance of the battery cell.

[0007] According to one embodiment of this application, the first insulating portion is connected to the outer peripheral surface of the first body.

[0008] In these alternative embodiments, the first insulating portion is connected to the outer peripheral surface of the first body. On the one hand, this can improve the installation stability of the first insulating portion. On the other hand, the first insulating portion can better absorb mechanical stress, improve the structural stability of the first body, and reduce the occurrence of warping at the edge of the first electrode.

[0009] According to one embodiment of this application, a first insulating portion is disposed around a first body, the first insulating portion is provided with a first through hole, and a portion of a first electrode tab is accommodated in the first through hole.

[0010] In these alternative embodiments, the first insulating portion is disposed around the first body, which can more effectively reduce the risk of bridging short circuits.

[0011] According to one embodiment of this application, the second insulating portion is connected to the outer peripheral surface of the second body.

[0012] In these alternative embodiments, a second insulating portion is connected to the outer peripheral surface of the second body, achieving dual protection of the first and second insulating portions and reducing the possibility of edge contact. Furthermore, during pressurization, the first and second insulating portions can better absorb mechanical stress, improving the structural stability of the first and second electrodes and reducing the occurrence of edge warping of the first and second electrodes.

[0013] According to one embodiment of this application, a second insulating portion is disposed around a second body, and the second insulating portion is provided with a second through hole, a portion of the second electrode tab being accommodated in the second through hole.

[0014] In these alternative embodiments, the second insulating portion is disposed around the second body, which can more effectively reduce the risk of bridging short circuits. Furthermore, the second insulating portion can uniformly absorb the stress of the second body, reducing the occurrence of warping at the edge of the second electrode. In addition, the second insulating portion can uniformly support the first electrode, further reducing deformation at the edge of the first electrode.

[0015] According to one embodiment of this application, the outer peripheral surface of the first insulating portion and the outer peripheral surface of the second insulating portion are flush.

[0016] In these alternative embodiments, the insulation components are configured in such a way that the internal structure of the battery cell is more regular, and the relative positional relationship between the electrodes can be better maintained when the battery cell is subjected to external impact or during long-term use, reducing the occurrence of local stress concentration, thereby enhancing the overall structural stability of the battery cell.

[0017] According to one embodiment of this application, the insulating assembly includes a first insulating member and a second insulating member. The first insulating member includes a first insulating portion and two second insulating portions, with the two second insulating portions of the first insulating member respectively connected to both sides of the first insulating portion of the first insulating member. The second insulating member includes two first insulating portions and one second insulating portion, with the two first insulating portions of the second insulating member respectively connected to both sides of the second insulating portion of the second insulating member.

[0018] In these alternative examples, the first insulator is designed as a convex structure, and the second insulator as a concave structure. These structures can better fill the narrow spaces of the electrode assembly, especially at electrode edges, corners, and gaps between electrodes, achieving a tight fit with the shape of the electrode assembly. Furthermore, this improves battery integration and production efficiency. The independent design of the first and second insulators allows for greater process tolerance during assembly with the electrode assembly, reducing manufacturing difficulty and further enhancing the integration and production efficiency of the battery cell. The convex and concave structures, when combined with the electrode assembly, form a nested structure. During charging and discharging, this not only suppresses electrode assembly expansion but also disperses mechanical stress, improving the performance of the battery cell.

[0019] According to one embodiment of this application, the insulating assembly includes a plurality of first insulating elements and a plurality of second insulating elements, which are alternately arranged along the stacking direction.

[0020] In these alternative examples, the alternating arrangement of the first and second insulators provides a certain degree of cushioning and shock absorption. When the battery cell is subjected to vibration or impact, the first and second insulators can absorb and disperse a portion of the force, reducing damage to the electrode assembly and other components, and protecting the internal structure of the battery cell.

[0021] According to one embodiment of this application, the insulating assembly further includes a third insulating member, which includes a first insulating portion and is located at one end of the insulating assembly along the stacking direction.

[0022] In these alternative embodiments, based on the arrangement of the first and second insulating members, the first electrode at one end of the electrode assembly along the stacking direction is not protected by the first and second insulating members. Therefore, by providing a third insulating member at one end of the insulating assembly along the stacking direction, the third insulating member corresponds to the first electrode at one end of the electrode assembly along the stacking direction, so that the insulating assembly provides more comprehensive protection for the electrode assembly.

[0023] It reduces stress concentration caused by local protrusions or depressions, thereby improving its structural stability.

[0024] According to one embodiment of this application, 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 portion is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

[0025] In these alternative embodiments, the first insulating portion is connected to the electrolyte layer, improving the connection stability of the first insulating portion and reducing the risk of the first insulating portion detaching from the electrode assembly. Moreover, by sandwiching the first body in the middle through the electrolyte layer and the first insulating portion, the excessive expansion or contraction of the first electrode sheet during the charging and discharging of the battery cell can be effectively limited, reducing the deformation of the electrode assembly.

[0026] According to one embodiment of this application, the first insulating portion includes a first part and two second parts, the two second parts being located on both sides of the first part, the first part being connected to the outer peripheral surface of the first body, and the two second parts being respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

[0027] In these alternative embodiments, the arrangement is such that the first insulating portion is tightly bonded to the electrode assembly, further improving the overall stability of the battery cell structure.

[0028] According to one embodiment of this application, 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 portion is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

[0029] In these alternative embodiments, a portion of the second insulating portion 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 second insulating portion can further fill the gap between two adjacent first bodies, which is beneficial to improving the overall structural stability of the electrode assembly. On the other hand, the connection between the second insulating portion and the electrolyte layer improves the connection stability of the second insulating portion and reduces the risk of the second insulating portion detaching from the electrode assembly. Moreover, during the charging and discharging process of the battery cell, the volume of the first electrode and the second electrode are prone to expansion and contraction. The second insulating portion, through mechanical support, can limit the excessive expansion or contraction of the volume of the first electrode and the second electrode, reducing the deformation of the electrode assembly. That is, the connection of the second insulating portion to the electrolyte layer 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 and the second electrode.

[0030] According to one embodiment of this application, the second insulating portion includes a third portion and two fourth portions, the two fourth portions being located on both sides of the fourth portion, the third portion being connected to the outer peripheral surface of the second body, and the two fourth portions being respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

[0031] In these alternative embodiments, the second insulating portion is configured to bond tightly to the electrode assembly, thereby further improving the overall stability of the battery cell structure.

[0032] According to one embodiment of this application, the insulating component includes two first substrates and two second substrates. The two first substrates are spaced apart along a first direction, and the two second substrates are spaced apart along a second direction. The two second substrates are located between the two first substrates, and the first substrates and second substrates are connected. The first direction, the second direction, and the lamination direction are perpendicular to each other. The first substrate includes a portion of each first insulating part and a portion of each second insulating part, and the second substrate includes another portion of each first insulating part and another portion of each second insulating part.

[0033] In these alternative embodiments, this arrangement facilitates the assembly of the insulating components onto the electrode components.

[0034] According to one embodiment of this application, in the second direction, the size of the first substrate is equal to the size of the first body. In the first direction, the size of the second substrate is equal to the size of the first body and the sum of the sizes of the two first substrates.

[0035] According to one embodiment of this application, the first insulating portion includes one or more of a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer; the second insulating portion includes one or more of a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

[0036] According to one embodiment of this application, the first insulating portion includes alumina and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene; the second insulating portion includes alumina and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene.

[0037] In these alternative embodiments, both the first insulating portion and the second insulating portion include alumina and an adhesive, which increases the adhesion between the first insulating portion and the second insulating portion, thereby improving the connection stability between the first insulating portion and the first electrode sheet, and also improving the connection stability between the second insulating portion and the second electrode sheet. Furthermore, the use of the adhesive gives the first and second insulating portions a certain degree of flexibility, allowing them to adapt to volume changes in the first and second electrode sheets 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.

[0038] According to one embodiment of this application, the first insulating part is a porous insulating layer or a honeycomb insulating layer; the second insulating part is a porous insulating layer or a honeycomb insulating layer.

[0039] In these alternative embodiments, these specific alternative embodiments enable the insulating component to have a high stress dispersion efficiency.

[0040] Secondly, this application provides a method for manufacturing a single battery cell, comprising:

[0041] An insulating assembly is provided, wherein the insulating assembly includes a plurality of first insulating portions and a plurality of second insulating portions;

[0042] An electrode assembly is provided, wherein the electrode assembly includes a plurality of first electrodes, a plurality of second electrodes, and an electrolyte layer, the first electrodes and the second electrodes having opposite polarities, the plurality of first electrodes and the plurality of second electrodes being alternately stacked along a stacking direction, the electrolyte layer being used to isolate the first electrodes and the second electrodes, the first electrodes including a first body and a first tab extending from the outer peripheral surface of the first body, the second electrodes including a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the first body protruding from the outer peripheral surface of the second body;

[0043] The first insulating portion covers at least a portion of the first body from the outside, the second insulating portion covers at least a portion of the second body from the outside, and a portion of the second insulating portion is disposed between two adjacent first body portions;

[0044] Apply pressure to the insulating and electrode assemblies;

[0045] Insulating components and electrode components are installed inside the housing.

[0046] The battery cell manufacturing method provided in this application covers at least a portion of the first body from the outside with a first insulating portion and covers at least a portion of the second body from the outside with a second insulating portion, thereby achieving dual protection for the electrode assembly. This method is used to insulate the first and second electrodes, reduces the phenomenon of edge warping of the first and second electrodes during the pressurization process of the electrode assembly, effectively suppresses edge overlap of the first and second electrodes, reduces the occurrence of internal short circuits in the electrode assembly, and improves the reliability of the battery cell.

[0047] According to one embodiment of this application, the insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and a second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member.

[0048] The steps of covering at least a portion of the first body from the outside with a first insulating portion, covering at least a portion of the second body from the outside with a second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions include:

[0049] The first insulating component and the second insulating component are stacked and connected;

[0050] A first insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the first insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the first insulating member covers at least a portion of the second body from the outside.

[0051] A second insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the second insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the second insulating member covers at least a portion of the second body from the outside.

[0052] In these alternative examples, the first and second insulators are set independently. During the assembly of the first and second insulators with the electrode assembly, the first and second insulators are assembled onto the electrode assembly respectively, which allows for a larger process tolerance, reduces manufacturing difficulty, and helps to improve the integration and production efficiency of the battery cell.

[0053] According to one embodiment of this application, the insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and a second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member.

[0054] The electrode assembly includes a first electrode unit and a second electrode unit. The first electrode unit includes a first electrode plate and two second electrode plates. The two second electrode plates of the first electrode unit are respectively disposed on both sides of the first electrode plate of the first electrode unit. The second electrode unit includes two first electrode plates and one second electrode plate. The two first electrode plates of the second electrode unit are respectively disposed on both sides of the second electrode plate of the second electrode unit.

[0055] The steps of covering at least a portion of the first body from the outside with a first insulating portion, covering at least a portion of the second body from the outside with a second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions include:

[0056] The first insulating member covers at least a portion of the first electrode unit from the outside, such that the first insulating portion of the first insulating member covers at least a portion of the first body of the first electrode unit from the outside, and the second insulating portion of the first insulating member covers at least a portion of the second body of the first electrode unit from the outside;

[0057] The second insulating member covers at least a portion of the second electrode unit from the outside, such that the first insulating portion of the second insulating member covers at least a portion of the first body of the second electrode unit from the outside, and the second insulating portion of the second insulating member covers at least a portion of the second body of the second electrode unit from the outside;

[0058] A first electrode unit having a first insulating element and a second electrode unit having a second insulating element are stacked and connected.

[0059] In these alternative examples, a first electrode unit with a first insulating element and a second electrode unit with a second insulating element are stacked and connected, realizing a modular design of the electrode assembly and the insulating assembly. Therefore, according to design requirements, the first electrode unit with the first insulating element and the second electrode unit with the second insulating element can be stacked and connected, which facilitates installation and replacement, as well as maintenance and upgrades.

[0060] Thirdly, this application provides a battery device including the aforementioned battery cell.

[0061] Fourthly, 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.

[0062] 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

[0063] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0064] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0065] Figure 2 This is an exploded view of a battery device provided in an embodiment of this application;

[0066] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0067] Figure 4 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0068] 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;

[0069] Figure 6 This is a partial structural schematic diagram of the electrode assembly and insulation assembly of a battery cell provided in an embodiment of this application;

[0070] Figure 7 This is a partial cross-sectional structural diagram of a battery cell in the stacking direction provided in another embodiment of this application;

[0071] 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;

[0072] Figure 9 This is a partial top view of a battery cell provided in another embodiment of this application;

[0073] Figure 10 This is a flowchart of a method for manufacturing a battery cell according to an embodiment of this application.

[0074] The accompanying drawings may not be drawn to scale.

[0075] Explanation of reference numerals in the attached figures:

[0076] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1a, Battery Module; 1b, First Housing; 1c, Second Housing;

[0077] 10. Battery cell; 1. Casing; 11. Receiving cavity; 2. Electrode assembly; 21. First electrode; 211. First body; 212. First tab; 22. Second electrode; 221. Second body; 222. Second tab; 23. Electrolyte layer; 3. Insulation assembly; 301. First insulating component; 302. Second insulating component; 31. First insulating part; 311. First portion; 312. Second portion; 32. Second insulating part; 321. Third portion; 322. Fourth portion; 33. First through hole; 34. Second through hole; 303. Third insulating component; 304. First substrate; 305. Second substrate;

[0078] x, first direction; y, second direction; z, stacking direction. Detailed Implementation

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In this application, "multiple" means two or more (including two).

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] The battery cell provided in this application has a first electrode and a second electrode stacked along a stacking 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 portion 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 portion 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0101] 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.

[0102] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0103] See Figure 1As 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.

[0104] Please refer to Figure 2 , Figure 2 Exploded views of battery devices provided in some embodiments of this application.

[0105] In some embodiments, the battery device 100 may include one or more battery cell assemblies for providing voltage and capacity.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] In some embodiments, the housing is used to house individual battery cells, and the housing can have various structures.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the battery device 100 may be an energy storage device.

[0117] 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.

[0118] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0119] 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.

[0120] 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.

[0121] The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0122] 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.

[0123] 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.

[0124] Sulfide solid electrolytes include sulfide crystalline solid electrolytes, sulfide glass, and glass-ceramic solid electrolytes.

[0125] 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.

[0126] like Figures 3 to 5 As shown, this application proposes a battery cell 10, which includes a housing 1, an electrode assembly 2, and an insulating assembly 3. The housing 1 has a receiving cavity 11. The electrode assembly 2 is disposed in the receiving cavity 11 and includes a plurality of first electrode plates 21, a plurality of second electrode plates 22, and an electrolyte layer 23. The first electrode plates 21 and the second electrode plates 22 have opposite polarities. The plurality of first electrode plates 21 and the plurality of second electrode plates 22 are alternately stacked along the stacking direction z. The electrolyte layer 23 is used to isolate the first electrode plates 21 and the second electrode plates 22. The first electrode plate 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 plate 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 first body 211 protrudes from the outer peripheral surface of the second body 221. The insulating component 3 includes a plurality of first insulating portions 31 and a plurality of second insulating portions 32, which are alternately arranged along the stacking direction z. The first insulating portions 31 are arranged along the outer periphery of the first body 211, and the second insulating portions 32 are arranged along the outer periphery of the second body 221. The second insulating portions 32 protrude from the surface of the first insulating portions 31 facing the first body 211. In the stacking direction z, a portion of the second insulating portions 32 is located between adjacent first bodies 211.

[0127] The outer casing 1 has a receiving cavity 11 for accommodating components such as the electrode assembly 2, the insulating layer, and optionally the electrolyte, to form the internal environment of the battery cell.

[0128] 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.

[0129] 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.

[0130] Optionally, the outer shell 1 is made of a material with a certain 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.

[0131] 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.

[0132] Electrode assembly 2 is the component in the battery cell where electrochemical reactions occur.

[0133] In some examples, the housing 1 may contain one or more electrode assemblies 2.

[0134] For example, the electrode assembly 2 includes a plurality of electrode units stacked together. Each electrode unit includes at least one first electrode 21, at least one second electrode 22, and at least three electrolyte layers 23.

[0135] Optionally, the electrode unit includes a first electrode 21 and two second electrodes 22, with the first electrode 21 located between the two second electrodes 22, and the electrolyte layer 23 used to isolate adjacent first electrodes 21 and second electrodes 22.

[0136] Optionally, the electrode unit includes two first electrodes 21 and one second electrode 22, with the second electrode 22 located between the two first electrodes 21, and the electrolyte layer 23 used to isolate adjacent first electrodes 21 and second electrodes 22.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] One of the first electrode 21 and the second electrode 22 is a positive electrode, and the other is a negative electrode.

[0143] 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.

[0144] In some examples, a portion of the outer peripheral surface of the first body 211 protrudes beyond the outer peripheral surface of the second body 221.

[0145] For example, the first body 211 and the second body 221 have a rectangular structure. The side of the non-electrode of the first body 211 protrudes from the side of the non-electrode of the second body 221. One side of the first electrode 212 extending from the first body 211 is flush with one side of the second electrode 222 extending from the second body 221.

[0146] In other examples, the outer peripheral surface of the first body 211 protrudes beyond the outer peripheral surface of the second body 221.

[0147] For example, the first body 211 and the second body 221 have a rectangular structure, and the four sides of the first body 211 protrude from the four sides of the second body 221.

[0148] For example, the insulating component 3 includes a plurality of first insulating portions 31 and a plurality of second insulating portions 32, which are alternately arranged along the stacking direction z, and adjacent first insulating portions 31 and second insulating portions 32 are connected.

[0149] In some examples, the first insulating portion 31 is disposed along the outer periphery of the first body 211 and is connected to the outer peripheral surface of the first body 211; alternatively, the first insulating portion 31 is disposed at a distance from the outer peripheral surface of the first body 211.

[0150] The first insulating portion 31 is disposed along the outer periphery of the first body 211 and serves to insulate the first electrode 21 and the second electrode 22, thereby protecting the first body 211 during the pressurization process of the electrode assembly 2. Furthermore, during pressurization, when the first electrode 21 contacts the first insulating portion 31, it can absorb the stacking stress on the edge of the first body 211, reducing the likelihood of the first electrode 21's edge warping. Based on the barrier provided by the first insulating portion 31, the edge overlap of the first electrode 21 and the second electrode 22 is effectively suppressed, reducing the occurrence of internal short circuits in the electrode assembly 2.

[0151] In some examples, the first insulating portion 31 is disposed along the outer periphery of the first body 211, and the first insulating portion 31 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.

[0152] In other examples, the first insulating portion 31 is disposed around the outer periphery of the first body 211 and avoids the first tab 212, in order to provide more effective protection for the first body 211.

[0153] In some examples, the second insulating portion 32 is disposed along the outer periphery of the second body 221 and is connected to the outer peripheral surface of the second body 221; alternatively, the second insulating portion 32 is disposed at a distance from the outer peripheral surface of the second body 221.

[0154] Since a portion of the first body 211 protrudes from the outer periphery of the second body 221, there is an overhang region between the stacked first electrode 21 and the second electrode 22. That is, the area where the first electrode 21 extends beyond the second electrode 22 is prone to stress concentration in the electrode edge area during the pressurization process of the electrode assembly 2, which damages the structure of the electrode edge area. This not only reduces the bonding force between the active material layer and the current collector, causing the active material layer to fall off, but also increases the impedance, affecting the performance of the battery cell.

[0155] The second insulating portion 32 is disposed along the outer periphery of the second body 221 and serves to insulate the first electrode 21 and the second electrode 22, thereby protecting the second body 221 during the pressurization process of the electrode assembly 2. Furthermore, during pressurization, a portion of the second insulating portion 32 fills the space between adjacent first bodies 211, absorbing some of the stacking stress and dispersing the stacking stress on the edges of the first body 211. In particular, when the second electrode 22 is in contact with the second insulating portion 32, it can also absorb the stacking stress on the edges of the second body 221, improving the structural stability of the second body 221 and enhancing the performance of the battery cell. Moreover, it can reduce the occurrence of edge warping of the second electrode 22. Based on the barrier provided by the second insulating portion 32, it effectively suppresses edge overlap between the first electrode 21 and the second electrode 22, reducing the occurrence of internal short circuits in the electrode assembly 2.

[0156] In some examples, the second insulating portion 32 is disposed along the outer periphery of the second body 221, and the second insulating portion 32 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.

[0157] In other examples, the second insulating portion 32 is disposed around the outer periphery of the second body 221 and avoids the second electrode tab 222, thereby providing more effective protection for the second body 221.

[0158] In some examples, the outer peripheral surface of the first insulating portion 31 is flush with the outer peripheral surface of the second insulating portion 32; alternatively, the outer peripheral surface of the first insulating portion 31 protrudes beyond the outer peripheral surface of the second insulating portion 32.

[0159] In some examples, the second insulating portion 32 includes a first portion and a second portion. In the stacking direction z, the first portion is disposed opposite to at least a portion of the first insulating portion 31. This can be understood as at least a portion of the orthographic projection of the first portion overlapping at least a portion of the orthographic projection of the first insulating portion 31 in the stacking direction z. The second portion is connected to the first portion and protrudes toward the second body 221. In the stacking direction z, at least a portion of the second portion is located between adjacent first bodies 211.

[0160] For example, the second part includes a first sub-part and a second sub-part, the first sub-part connecting the first part and the second sub-part, and in the stacking direction z, the second sub-part overlaps with the first body 211, while the first sub-part does not overlap with the first body 211.

[0161] In some examples, the first insulating portion 31 is connected to the outer peripheral surface of the first body 211, and the first insulating portion 31 is sandwiched between two adjacent second bodies 221. Exemplarily, in the direction perpendicular to the stacking direction z, the first insulating portion 31 does not extend beyond the second body 221; alternatively, in the direction perpendicular to the stacking direction z, a portion of the first insulating portion 31 extends beyond the second body 221.

[0162] The battery cell provided in this application has a first insulating portion 31 disposed on the outer periphery of the first body 211, and a second insulating portion 32 disposed on the outer periphery of the second body 221. This provides dual protection for the first insulating portion 31 and the second insulating portion 32, insulating the first electrode 21 and the second electrode 22. This reduces the likelihood of edge warping of the first electrode 21 and the second electrode 22 during the pressurization process of the electrode assembly 2, effectively suppressing edge overlap of the first electrode 21 and the second electrode 22, reducing the occurrence of internal short circuits in the electrode assembly 2, and thus improving the reliability of the battery cell. Furthermore, a portion of the second insulating portion 32 is located between adjacent first bodies 211, providing support for the first body 211 and absorbing stacking stress during the pressurization process. This improves the structural stability of the second body 221, further reducing the likelihood of edge warping of the second electrode 22, decreasing the probability of overlap between the first electrode 21 and the second electrode 22, and improving the performance of the battery cell.

[0163] According to one embodiment of this application, such as Figure 5 As shown, the first insulating part 31 is connected to the outer peripheral surface of the first body 211.

[0164] In some examples, the first insulating portion 31 is fixedly connected to the outer peripheral surface of the first body 211. Alternatively, the first insulating portion 31 is detachably connected to the outer peripheral surface of the first body 211.

[0165] 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 part 31, which is then connected to the outer peripheral surface of the first body 211. Alternatively, the first insulating part 31 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 part 31.

[0166] In some examples, the first insulating portion 31 does not extend beyond the first body 211 in the stacking direction z; alternatively, the second insulating portion 32 does not extend beyond the first insulating portion 31 in a direction perpendicular to the stacking direction z, and at least one end of the first insulating portion 31 extends beyond the first body 211 in the stacking direction z.

[0167] In these alternative embodiments, the first insulating part 31 is connected to the outer peripheral surface of the first body 211. On the one hand, this can improve the installation stability of the first insulating part 31. On the other hand, the first insulating part 31 can better absorb mechanical stress, improve the structural stability of the first body 211, and reduce the occurrence of warping at the edge of the first electrode 21.

[0168] According to one embodiment of this application, such as Figure 5 As shown, the first insulating part 31 is arranged around the first body 211, and the first insulating part 31 is provided with a first through hole 33, and a part of the first electrode tab 212 is accommodated in the first through hole 33.

[0169] For example, the first body 211 is generally rectangular in shape, and the first insulating portion 31 is generally a rectangular frame structure 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 portion 31 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 33, and a portion of the first electrode tab 212 is accommodated in the first through hole 33 and extends out of the first through hole 33.

[0170] In these alternative embodiments, the first insulating portion 31 is disposed around the first body 211, which can more effectively reduce the risk of bridging short circuits.

[0171] According to one embodiment of this application, such as Figure 5 As shown, the second insulating part 32 is connected to the outer peripheral surface of 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 portion 32, which is then connected to the outer peripheral surface of the second body 221. Alternatively, the second insulating portion 32 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 portion 32.

[0173] In some examples, the second insulating portion 32 is disposed along the outer periphery of the second body 221, and the second insulating portion 32 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 portion 32 is disposed around the outer periphery of the second body 221 and avoids the second electrode tab 222, thereby providing more effective protection for the second body 221.

[0175] In some examples, the second insulating portion 32 does not extend beyond the second body 221 in the stacking direction z; alternatively, at least one end of the second insulating portion 32 extends beyond the second body 221 in the stacking direction z.

[0176] In these alternative embodiments, the outer peripheral surface of the second body 221 is connected to a second insulating portion 32, achieving dual protection for the first insulating portion 31 and the second insulating portion 32, reducing the possibility of edge contact. Moreover, during pressurization, the first insulating portion 31 and the second insulating portion 32 can better absorb mechanical stress, improve the structural stability of the first electrode 21 and the second electrode 22, and reduce the occurrence of warping at the edges of the first electrode 21 and the second electrode 22.

[0177] According to one embodiment of this application, such as Figure 5 As shown, the second insulating part 32 is arranged around the second body 221, and the second insulating part 32 is provided with a second through hole 34, and a part of the second electrode tab 222 is accommodated in the second through hole 34.

[0178] For example, the second body 221 is generally rectangular in shape, and the second insulating portion 32 is generally a rectangular frame structure 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 portion 32 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 34, and a portion of the second tab 222 is accommodated in the second through hole 34 and extends out of the second through hole 34.

[0179] In these alternative embodiments, the second insulating portion 32 is disposed around the second body 221, which can more effectively reduce the risk of lap short circuits. Furthermore, the second insulating portion 32 can uniformly absorb the stress of the second body 221, reducing the occurrence of warping at the edge of the second electrode 22. In addition, the second insulating portion 32 can uniformly support the first electrode 21, further reducing deformation at the edge of the first electrode 21.

[0180] According to one embodiment of this application, in the stacking direction z, the outer peripheral surface of the first insulating portion 31 and the outer peripheral surface of the second insulating portion 32 are flush.

[0181] For example, the second insulating portion 32 includes a first insulator and a second insulator, the second insulator being connected to the first insulator and connected to the outer peripheral surface of the second body 221, and the first insulating portion 31 being connected to the first insulating portion 31. In the stacking direction z, the outer peripheral surface of the first insulator is flush with the outer peripheral surface of the first insulating portion 31.

[0182] In these alternative embodiments, the insulating component 3 is configured such that the internal structure of the battery cell is more regular, and the relative positional relationship between the electrodes can be better maintained when the battery cell is subjected to external impact or during long-term use, reducing the occurrence of local stress concentration, thereby enhancing the overall structural stability of the battery cell.

[0183] See also Figure 6 , Figure 6 This is a partial structural schematic diagram of the electrode assembly and insulation assembly of a battery cell provided in an embodiment of this application.

[0184] According to one embodiment of this application, such as Figure 5 and Figure 6 As shown, the insulating assembly 3 includes a first insulating member 301 and a second insulating member 302. The first insulating member 301 includes a first insulating portion 31 and two second insulating portions 32, with the two second insulating portions 32 respectively connected to both sides of the first insulating portion 31. The second insulating member 302 includes two first insulating portions 31 and one second insulating portion 32, with the two first insulating portions 31 respectively connected to both sides of the second insulating portion 32.

[0185] For example, the first insulating member 301 includes a first insulating part 31 and two second insulating parts 32. The two second insulating parts 32 of the first insulating member 301 are respectively connected to both sides of the first insulating part 31 of the first insulating member 301. The first insulating part 31 is connected to the outer peripheral surface of the first body 211 and the outer peripheral surface of the electrolyte layer 23. The second insulating parts 32 are connected to the outer peripheral surface of the second body 221.

[0186] For example, the first insulating member 301 includes a first insulating part 31 and two second insulating parts 32. The two second insulating parts 32 of the first insulating member 301 are respectively connected to both sides of the first insulating part 31 of the first insulating member 301. The first insulating part 31 is connected to the outer peripheral surface of the first body 211, and the second insulating parts 32 are connected to the outer peripheral surface of the second body 221 and the outer peripheral surface of the electrolyte layer 23.

[0187] For example, the second insulating member 302 includes two first insulating portions 31 and one second insulating portion 32. The two first insulating portions 31 of the second insulating member 302 are respectively connected to both sides of the second insulating portion 32 of the second insulating member 302. The first insulating portions 31 are connected to the outer peripheral surface of the first body 211 and the outer peripheral surface of the electrolyte layer 23, and the second insulating portion 32 is connected to the outer peripheral surface of the second body 221.

[0188] For example, the second insulating member 302 includes two first insulating portions 31 and one second insulating portion 32. The two first insulating portions 31 of the second insulating member 302 are respectively connected to both sides of the second insulating portion 32 of the second insulating member 302. The first insulating portions 31 are connected to the outer peripheral surface of the first body 211, and the second insulating portion 32 is connected to the outer peripheral surface of the second body 221 and the outer peripheral surface of the electrolyte layer 23.

[0189] In some examples, the first insulator 301 and the second insulator 302 are manufactured first, and then the first insulator 301 and the second insulator 302 are assembled with the electrode assembly 2.

[0190] In other examples, the electrode assembly 2 includes a first electrode unit and a second electrode unit. A first insulating member 301 and a second insulating member 302 are first manufactured. The first insulating member 301 is assembled with the first electrode unit, and the second insulating member 302 is assembled with the second electrode unit. The first electrode unit having the first insulating member 301 and the second electrode unit having the second insulating member 302 are stacked together.

[0191] The insulating component 3 is manufactured as an integral part or as an integral part located on one side of the electrode component 2. During the assembly of the insulating component 3 and the electrode component 2, there is a high assembly precision and a low tolerance for error. However, this increases the assembly difficulty, and when the substrate of the insulating component 3 is inserted into the electrode component 2, it can easily damage the electrode component 2, thus affecting the performance of the battery cell. Therefore, independent first insulating component 301 and second insulating component 302 are provided, and the first insulating component 301 and second insulating component 302 can be inserted into the electrode component 2 respectively, facilitating assembly with the electrode component 2 and allowing for a larger process error tolerance.

[0192] In these alternative examples, the first insulating member 301 is designed as a convex structure, and the second insulating member 302 is designed as a concave structure. These structures can better fill the narrow space of the electrode assembly 2, especially at the edges, corners, and gaps between electrodes, achieving a tight fit with the shape of the electrode assembly 2. Furthermore, this improves the battery's integration and production efficiency. The independent arrangement of the first and second insulating members 301 and 302 allows for greater process tolerance during assembly with the electrode assembly 2, reducing manufacturing difficulty and improving the integration and production efficiency of the battery cell. The convex and concave structures, when combined with the electrode assembly 2, form a nested structure. During charging and discharging, this not only suppresses the expansion of the electrode assembly 2 but also disperses its mechanical stress, improving the performance of the battery cell.

[0193] According to one embodiment of this application, the insulating component 3 includes a plurality of first insulating elements 301 and a plurality of second insulating elements 302, which are alternately arranged along the stacking direction z.

[0194] For example, the insulating component 3 includes two first insulating members 301 and one second insulating member 302, with the two first insulating members 301 connected to both sides of the second insulating member 302.

[0195] In these alternative examples, the alternately arranged first insulator 301 and second insulator 302 have a certain buffering and shock absorption effect. When the battery cell is subjected to vibration or impact, the first insulator 301 and the second insulator 302 can absorb and disperse part of the force, reduce damage to the electrode assembly 2 and other components, and protect the internal structure of the battery cell.

[0196] 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 insulating member 301 is flush with the outer peripheral surface of the second insulating member 302.

[0197] In these alternative examples, the outer peripheral surface of the first insulator 301 is flush with the outer peripheral surface of the second insulator 302. During the pressurization process, the flush outer peripheral surfaces can distribute the pressure more evenly when subjected to external force, reducing stress concentration caused by local protrusions or depressions and improving their structural stability.

[0198] See also Figure 7 , 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.

[0199] According to one embodiment of this application, such as Figure 7As shown, the insulating assembly 3 also includes a third insulating member 303, which includes a first insulating portion 31 and is located at one end of the insulating assembly 3 along the stacking direction z.

[0200] For example, the insulating component 3 includes a plurality of first insulating elements 301, a plurality of second insulating elements 302 and a third insulating element 303, the plurality of first insulating elements 301 and the plurality of second insulating elements 302 are alternately arranged along the stacking direction z, and the third insulating element 303 is located at one end or both ends of the insulating component 3 along the stacking direction z.

[0201] In some examples, the third insulating member 303 is connected to the second insulating member 302, and the outer peripheral surface of the third insulating member 303 is flush with the outer peripheral surface of the second insulating member 302 in the stacking direction z.

[0202] In these alternative embodiments, based on the arrangement of the first insulating member 301 and the second insulating member 302, the first electrode 21 at one end of the electrode assembly 2 along the stacking direction z is not protected by the first insulating member 301 and the second insulating member 302. Therefore, by providing a third insulating member 303 at one end of the insulating assembly 3 along the stacking direction z, the third insulating member 303 corresponds to the first electrode 21 at one end of the electrode assembly 2 along the stacking direction z, so that the insulating assembly 3 provides more comprehensive protection for the electrode assembly 2.

[0203] According to one embodiment of this application, such as Figure 7 As shown, in the stacking direction z, the outer peripheral surfaces of the third insulating member 303, the first insulating member 301, and the second insulating member 302 are all flush.

[0204] In some examples, the electrode assembly 2 has an electrolyte layer 23 on both sides of the first electrode 21 along the stacking direction z.

[0205] In some examples, the outer peripheral surface of the first body 211 is flush with the outer peripheral surface of the electrolyte layer 23 in the stacking direction z. The first insulating portion 31 of the third insulating member 303 is also connected to the electrolyte layer 23.

[0206] In these alternative embodiments, the outer peripheral surface of the insulating component 3 is flush with the stacking direction z, and the flush outer peripheral surface allows the insulating component 3 to be subjected to external force more evenly.

[0207] According to one embodiment of this application, 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. A portion of the first insulating portion 31 of the third insulating member 303 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0208] In some examples, the first insulating portion 31 of the third insulating member 303 includes a fifth portion and two sixth portions, the two sixth portions being located on both sides of the fifth portion, the fifth portion being connected to the outer peripheral surface of the first body 211, and the two sixth portions being connected to the outer peripheral surfaces of two adjacent electrolyte layers 23 respectively.

[0209] In these alternative embodiments, the first insulating portion 31 of the third insulating member 303 is connected to the electrolyte layer 23, which improves the connection stability of the third insulating member 303 and reduces the risk of the third insulating member 303 falling off from the electrode assembly 2.

[0210] 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 portion 31 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0211] 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 electrolyte layer 23 protrudes from the outer peripheral surface of the second body 221.

[0212] 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.

[0213] 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 portion 31 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.

[0214] For example, an electrolyte slurry is coated on two opposing surfaces of the first body 211, and the electrolyte slurry is cured to form an electrolyte layer 23.

[0215] In these alternative embodiments, the first insulating portion 31 is connected to the electrolyte layer 23, improving the connection stability of the first insulating portion 31 and reducing the risk of the first insulating portion 31 detaching from the electrode assembly 2. Moreover, by sandwiching the first body 211 in the middle through the electrolyte layer 23 and the first insulating portion 31, the excessive expansion or contraction of the first electrode 21 during the charging and discharging of the battery cell can be effectively limited, reducing the deformation of the electrode assembly 2.

[0216] According to one embodiment of this application, such as Figure 5 and Figure 6As shown, the first insulating part 31 includes a first part 311 and two second parts 312. The two second parts 312 are located on both sides of the first part 311. The first part 311 is connected to the outer peripheral surface of the first body 211, and the two second parts 312 are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0217] For example, the first insulating portion 31 includes a first portion 311 and two second portions 312. The first portion 311 is connected to the outer peripheral surface of the first body 211, and the two second portions 312 are respectively located on both sides of the first portion 311. The two second portions 312 are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23. In the direction perpendicular to the stacking direction z, the second portion 312 overlaps with at least a portion of the electrolyte layer 23. This can be understood as the second portion 312 overlapping a portion of the electrolyte layer 23 in the direction perpendicular to the stacking direction z, or the second portion 312 overlapping the electrolyte layer 23.

[0218] 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.

[0219] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the first body 211.

[0220] In these alternative embodiments, the first insulating portion 31 is configured to be tightly bonded to the electrode assembly 2, thereby further improving the overall stability of the battery cell structure.

[0221] 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.

[0222] According to one embodiment of this application, such as Figure 8 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 portion 32 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0223] 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.

[0224] 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.

[0225] 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 portion 32 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.

[0226] 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.

[0227] In these alternative embodiments, a portion of the second insulating portion 32 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 second insulating portion 32 can further fill the gap between two adjacent first bodies 211, which is beneficial to improving the overall structural stability of the electrode assembly 2. On the other hand, the connection between the second insulating portion 32 and the electrolyte layer 23 improves the connection stability of the second insulating portion 32 and reduces the risk of the second insulating portion 32 detaching from the electrode assembly 2. Moreover, during the charging and discharging process of the battery cell, the volume of the first electrode 21 and the second electrode 22 is prone to expansion and contraction. The second insulating portion 32, 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 second insulating portion 32 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.

[0228] According to one embodiment of this application, such as Figure 8 As shown, the second insulating part 32 includes a third part 321 and two fourth parts 322. The two fourth parts 322 are located on both sides of the fourth part 322. The third part 321 is connected to the outer peripheral surface of the second body 221, and the two fourth parts 322 are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0229] The second insulating part 32 includes a third part 321 and two fourth parts 322. The third part 321 is connected to the outer peripheral surface of the second body 221, and the two fourth parts 322 are located on both sides of the third part 321. The two second parts 312 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0230] For example, the second insulating portion 32 includes a third portion 321 and two fourth portions 322. The third portion 321 is connected to the outer peripheral surface of the second body 221, and the two fourth portions 322 are located on both sides of the third portion 321. The two fourth portions 322 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23, and the end face of the fourth portion 322 facing away from the second portion 312 abuts against the first body 211.

[0231] In some examples, the fourth portion 322 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 322 overlapping a portion of the electrolyte layer 23 in a direction perpendicular to the stacking direction z, or the fourth portion 322 overlapping the entire electrolyte layer 23.

[0232] 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.

[0233] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the second body 221.

[0234] In these alternative embodiments, the second insulating portion 32 is configured to be tightly bonded to the electrode assembly 2, thereby further improving the overall stability of the battery cell structure.

[0235] See also Figure 9 , Figure 9 This is a partial top view of a battery cell provided in another embodiment of this application.

[0236] According to one embodiment of this application, such as Figure 9 As shown, the insulating component 3 includes two first substrates 304 and two second substrates 305. The two first substrates 304 are spaced apart along a first direction x, and the two second substrates 305 are spaced apart along a second direction y. The two second substrates 305 are located between the two first substrates 304. The first substrates 304 and the second substrates 305 are connected. A portion of a plurality of first insulating parts 31 and a portion of a plurality of second insulating parts 32 form the first substrate 304. Another portion of the plurality of first insulating parts 31 and another portion of the plurality of second insulating parts 32 form the second substrate 305. The first direction x, the second direction y, and the stacking direction z are perpendicular to each other.

[0237] In some examples, the insulating component 3 includes two first substrates 304 and two second substrates 305. The two first substrates 304 are spaced apart along a first direction x, and the two second substrates 305 are spaced apart along a second direction y. The two first substrates 304 are located between the two second substrates 305, and the first substrates 304 and the second substrates 305 are connected. The first substrate 304 includes a first insulating element 301 and a second insulating element 302 stacked together. The second substrate 305 includes a first insulating element 301 and a second insulating element 302 stacked together.

[0238] A portion of the first insulating member 301 and a portion of the second insulating member 302 are stacked and installed on the electrode assembly 2 to form a first substrate 304; another portion of the first insulating member 301 and another portion of the second insulating member 302 are stacked and installed on the electrode assembly 2 to form a second substrate 305.

[0239] In these alternative embodiments, this arrangement facilitates the assembly of the insulating component 3 onto the electrode component 2.

[0240] According to one embodiment of this application, such as Figure 9 As shown, in the second direction y, the size of the first substrate 304 is equal to the size of the first body 211. In the first direction x, the size of the second substrate 305 is equal to the size of the first body 211 and the sum of the sizes of the two first substrates 304.

[0241] According to one embodiment of this application, the first insulating portion 31 includes one or more of a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer. The second insulating portion 32 includes one or more of a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

[0242] Optionally, the first insulating portion 31 and the second insulating portion 32 are modified alumina layers. This results in higher strength and lower modulus.

[0243] Optionally, the first insulating portion 31 and the second insulating portion 32 are compression-molded polymer layers.

[0244] For example, the compression-molded polymer may comprise a mixture of at least two materials selected from: 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). 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 fracture under pressure, the compression-molded polymer, along with the fractured material, is shaped together to form the first insulating portion 31.

[0245] According to one embodiment of this application, the first insulating portion 31 includes alumina and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene. The second insulating portion 32 includes alumina and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene.

[0246] For example, the first electrode 21 is a positive electrode, and the adhesive for the first insulating portion 31 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.

[0247] For example, the second electrode 22 is a negative electrode, and the adhesive for the second insulating portion 32 includes polystyrene. Specifically, an optional adhesive can be applied to the negative electrode to improve its oxidation resistance.

[0248] In these alternative embodiments, both the first insulating portion 31 and the second insulating portion 32 include alumina and an adhesive, which increases the adhesion between the first insulating portion 31 and the second insulating portion 32, thereby improving the connection stability between the first insulating portion 31 and the first electrode 21, and improving the connection stability between the second insulating portion 32 and the second electrode 22. Furthermore, the use of the adhesive gives the first insulating portion 31 and the second insulating portion 32 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.

[0249] According to one embodiment of this application, the first insulating portion 31 is a porous insulating layer or a honeycomb insulating layer. The second insulating portion 32 is a porous insulating layer or a honeycomb insulating layer.

[0250] In these alternative embodiments, these specific alternative embodiments enable the insulating component 3 to have a high stress dispersion efficiency.

[0251] According to one embodiment of this application, the thickness of the first insulating portion 31 is from 5 μm to 500 μm.

[0252] In some examples, the thickness of the second insulating portion 32 is from 5 μm to 500 μm.

[0253] According to one embodiment of this application, the first electrode 21 is a positive electrode and the second electrode 22 is a negative electrode.

[0254] 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.

[0255] 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.

[0256] See also Figure 10 , Figure 10 This is a flowchart of a method for manufacturing a battery cell according to an embodiment of this application.

[0257] like Figure 10 As shown, in a second aspect, this application provides a method for manufacturing a single battery cell, comprising:

[0258] Step S100: Provide an insulating assembly, wherein the insulating assembly includes a plurality of first insulating parts and a plurality of second insulating parts.

[0259] Step S200: Provide an electrode assembly, wherein the electrode assembly includes a plurality of first electrodes, a plurality of second electrodes, and an electrolyte layer. The first electrodes and the second electrodes have opposite polarities. The plurality of first electrodes and the plurality of second electrodes are alternately stacked along the stacking direction. The electrolyte layer is used to isolate the first electrodes and the 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 first body protrudes from the outer peripheral surface of the second body.

[0260] Step S300: The first insulating portion covers at least a portion of the first body from the outside, the second insulating portion covers at least a portion of the second body from the outside, and a portion of the second insulating portion is disposed between two adjacent first body portions.

[0261] Step S400: Apply pressure to the insulation components and electrode components.

[0262] Step S500: Install the insulation assembly and electrode assembly into the housing.

[0263] The battery cell manufacturing method provided in this application covers at least a portion of the first body from the outside with a first insulating portion and covers at least a portion of the second body from the outside with a second insulating portion, thereby achieving dual protection for the electrode assembly. This method is used to insulate the first and second electrodes, reduces the phenomenon of edge warping of the first and second electrodes during the pressurization process of the electrode assembly, effectively suppresses edge overlap of the first and second electrodes, reduces the occurrence of internal short circuits in the electrode assembly, and improves the reliability of the battery cell.

[0264] According to one embodiment of this application, the insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and one second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member.

[0265] The steps of covering at least a portion of the first body from the outside with a first insulating portion, covering at least a portion of the second body from the outside with a second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions include:

[0266] The first and second insulating components are stacked and connected.

[0267] A first insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the first insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the first insulating member covers at least a portion of the second body from the outside.

[0268] A second insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the second insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the second insulating member covers at least a portion of the second body from the outside.

[0269] In some examples, a first insulating member and a second insulating member are stacked and connected, and the first insulating member is used to cover a portion of the electrode assembly from the outside, and the second insulating member is used to cover a portion of the electrode assembly from the outside.

[0270] In other examples, a first insulating element is used to cover a portion of the electrode assembly from the outside, and a second insulating element is used to cover a portion of the electrode assembly from the outside, such that the first and second insulating elements are stacked and connected.

[0271] In some examples, the outer peripheral surface of the first body is flush with the outer peripheral surface of the electrolyte layer. A first insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the first insulating member covers at least a portion of the first body and at least a portion of the electrolyte layer from the outside, and a second insulating portion of the first insulating member covers at least a portion of the second body from the outside. A second insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the second insulating member covers at least a portion of the first body and at least a portion of the electrolyte layer from the outside, and a second insulating portion of the second insulating member covers at least a portion of the second body from the outside.

[0272] In other examples, the outer peripheral surface of the second body is flush with the outer peripheral surface of the electrolyte layer. A first insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the first insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the first insulating member covers at least a portion of the second body and at least a portion of the electrolyte layer from the outside. A second insulating member is used to cover a portion of the electrode assembly from the outside, such that a first insulating portion of the second insulating member covers at least a portion of the first body from the outside, and a second insulating portion of the second insulating member covers at least a portion of the second body and at least a portion of the electrolyte layer from the outside.

[0273] In these alternative examples, the first and second insulators are set independently. During the assembly of the first and second insulators with the electrode assembly, the first and second insulators are assembled onto the electrode assembly respectively, which allows for a larger process tolerance, reduces manufacturing difficulty, and helps to improve the integration and production efficiency of the battery cell.

[0274] According to one embodiment of this application, the insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and one second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member.

[0275] The electrode assembly includes a first electrode unit and a second electrode unit. The first electrode unit includes a first electrode plate and two second electrode plates, with the two second electrode plates of the first electrode unit respectively disposed on both sides of the first electrode plate of the first electrode unit. The second electrode unit includes two first electrode plates and one second electrode plate, with the two first electrode plates of the second electrode unit respectively disposed on both sides of the second electrode plate of the second electrode unit.

[0276] The steps of covering at least a portion of the first body from the outside with a first insulating portion, covering at least a portion of the second body from the outside with a second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions include:

[0277] The first insulating member covers at least a portion of the first electrode unit from the outside, such that the first insulating portion of the first insulating member covers at least a portion of the first body of the first electrode unit from the outside, and the second insulating portion of the first insulating member covers at least a portion of the second body of the first electrode unit from the outside.

[0278] The second insulating member covers at least a portion of the second electrode unit from the outside, such that the first insulating portion of the second insulating member covers at least a portion of the first body of the second electrode unit from the outside, and the second insulating portion of the second insulating member covers at least a portion of the second body of the second electrode unit from the outside.

[0279] A first electrode unit having a first insulating element and a second electrode unit having a second insulating element are stacked and connected.

[0280] In these alternative examples, a first electrode unit with a first insulating element and a second electrode unit with a second insulating element are stacked and connected, realizing a modular design of the electrode assembly and the insulating assembly. Therefore, according to design requirements, the first electrode unit with the first insulating element and the second electrode unit with the second insulating element can be stacked and connected, which facilitates installation and replacement, as well as maintenance and upgrades.

[0281] Thirdly, this application provides a battery device including the aforementioned battery cell.

[0282] Fourthly, 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.

[0283] According to some embodiments of this application, see Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 10 The battery cell 10 includes a housing 1, an electrode assembly 2, and an insulating assembly 3. The housing 1 has a receiving cavity 11. The electrode assembly 2 is disposed in the receiving cavity 11 and includes a plurality of first electrode plates 21, a plurality of second electrode plates 22, and an electrolyte layer 23. The first electrode plates 21 and the second electrode plates 22 have opposite polarities. The plurality of first electrode plates 21 and the plurality of second electrode plates 22 are alternately stacked along the stacking direction z. The electrolyte layer 23 is used to isolate the first electrode plates 21 and the second electrode plates 22. The first electrode plate 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 plate 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 first body 211 protrudes from the outer peripheral surface of the second body 221.

[0284] The insulating assembly 3 includes a plurality of first insulating portions 31 and a plurality of second insulating portions 32, which are alternately arranged along the stacking direction z. The first insulating portions 31 surround a first body 211 and have a first through hole 33, into which a portion of a first tab 212 is accommodated. The first insulating portions 31 are connected to the outer peripheral surface of the first body 211. The second insulating portions 32 surround a second body 221 and have a second through hole 34, into which a portion of a second tab 222 is accommodated. The second insulating portions 32 are connected to the outer peripheral surface of the second body 221. The second insulating portions 32 protrude from the surface of the first insulating portions 31 facing the first body 211, and in the stacking direction z, a portion of the second insulating portions 32 is located between adjacent first bodies 211. In the stacking direction z, the outer peripheral surfaces of the first insulating portions 31 and the second insulating portions 32 are flush.

[0285] The insulating assembly 3 includes multiple first insulating elements 301, multiple second insulating elements 302, and a third insulating element 303, with the multiple first insulating elements 301 and multiple second insulating elements 302 alternately arranged along the stacking direction z. Each first insulating element 301 includes one first insulating portion 31 and two second insulating portions 32, with the two second insulating portions 32 respectively connected to both sides of the first insulating portion 31. Each second insulating element 302 includes two first insulating portions 31 and one second insulating portion 32, with the two first insulating portions 31 respectively connected to both sides of the second insulating portion 32. 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 portion 31 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23. The first insulating portion 31 includes a first part 311 and two second parts 312, which are located on both sides of the first part 311. The first part 311 is connected to the outer peripheral surface of the first body 211, and the two second parts 312 are respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers 23. The third insulating member 303 includes a first insulating portion 31 and is located at one end of the insulating assembly 3 along the lamination direction z. In the lamination direction z, the outer peripheral surfaces of the third insulating member 303, the first insulating member 301, and the second insulating member 302 are all flush. 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. A portion of the third insulating member 303 is disposed along the outer periphery of the electrolyte layer 23 and connected to the outer peripheral surface of the electrolyte layer 23.

[0286] The insulating assembly 3 includes two first substrates 304 and two second substrates 305. The two first substrates 304 are spaced apart along a first direction x, and the two second substrates 305 are spaced apart along a second direction y. The two second substrates 305 are located between the two first substrates 304 and are connected. A portion of a plurality of first insulating parts 31 and a portion of a plurality of second insulating parts 32 form the first substrate 304, and another portion of the first insulating parts 31 and another portion of the second insulating parts 32 form the second substrate 305. The first direction x, the second direction y, and the stacking direction z are all perpendicular to each other. In the second direction y, the size of the first substrate 304 is equal to the size of the first main body 211. In the first direction x, the size of the second substrate 305 is equal to the sum of the size of the first main body 211 and the size of the two first substrates 304.

[0287] The first insulating part 31 includes aluminum oxide and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene. The second insulating part 32 includes aluminum oxide and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene.

[0288] 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 plurality of first electrodes, a plurality of second electrodes, and an electrolyte layer. The first electrodes and the second electrodes have opposite polarities. The plurality of first electrodes and the plurality of second electrodes are alternately stacked along a stacking direction. The electrolyte layer is used to isolate the first electrodes and the 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 first body protrudes from the outer peripheral surface of the second body. An insulating assembly includes a plurality of first insulating portions and a plurality of second insulating portions, which are alternately arranged along a stacking direction. The first insulating portions are arranged along the outer periphery of a first body, and the second insulating portions are arranged along the outer periphery of a second body. The second insulating portions protrude from the surface of the first insulating portions facing the first body, and a portion of the second insulating portions is located between adjacent first bodies in the stacking direction.

2. The battery cell according to claim 1, characterized in that, The first insulating part is connected to the outer peripheral surface of the first body.

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

4. The battery cell according to claim 1, characterized in that, The second insulating part is connected to the outer peripheral surface of the second body.

5. The battery cell according to claim 1, characterized in that, The second insulating portion is disposed around the second body, and the second insulating portion is provided with a second through hole, a portion of the second electrode tab is accommodated in the second through hole.

6. The battery cell according to claim 1, characterized in that, The outer peripheral surface of the first insulating part is flush with the outer peripheral surface of the second insulating part.

7. The battery cell according to claim 1, characterized in that, The insulating assembly includes a first insulating component and a second insulating component; The first insulating member includes a first insulating portion and two second insulating portions, wherein the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; The second insulating member includes two first insulating portions and one second insulating portion, with the two first insulating portions of the second insulating member respectively connected to both sides of the second insulating portion of the second insulating member.

8. The battery cell according to claim 7, characterized in that, The insulating assembly includes a plurality of first insulating elements and a plurality of second insulating elements, which are alternately arranged along the stacking direction.

9. The battery cell according to claim 7, characterized in that, The insulating assembly further includes a third insulating element, which includes a first insulating portion, and the third insulating element is located at one end of the insulating assembly along the stacking direction.

10. The battery cell according to claim 1, characterized in that, The outer peripheral surface of the first main body is flush with the outer peripheral surface of the electrolyte layer; A portion of the first insulating portion is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

11. The battery cell according to claim 10, characterized in that, The first insulating portion includes a first part and two second parts, the two second parts being located on both sides of the first part, the first part being connected to the outer peripheral surface of the first body, and the two second parts being respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

12. The battery cell according to claim 1, characterized in that, The outer peripheral surface of the second main body is flush with the outer peripheral surface of the electrolyte layer; A portion of the second insulating portion is disposed along the outer periphery of the electrolyte layer and connected to the outer peripheral surface of the electrolyte layer.

13. The battery cell according to claim 12, characterized in that, The second insulating portion includes a third portion and two fourth portions, the two fourth portions being located on both sides of the fourth portion, the third portion being connected to the outer peripheral surface of the second body, and the two fourth portions being respectively connected to the outer peripheral surfaces of two adjacent electrolyte layers.

14. The battery cell according to claim 1, characterized in that, The insulating component includes two first substrates and two second substrates. The two first substrates are spaced apart along a first direction, and the two second substrates are spaced apart along a second direction. The two second substrates are located between the two first substrates. The first substrates and the second substrates are connected. The first direction, the second direction, and the stacking direction are perpendicular to each other. The first substrate includes a portion of each of the first insulating portions and a portion of each of the second insulating portions, and the second substrate includes another portion of each of the first insulating portions and another portion of each of the second insulating portions.

15. The battery cell according to claim 14, characterized in that, In the second direction, the size of the first substrate is equal to the size of the first body; In the first direction, the size of the second substrate is equal to the size of the first body and the sum of the sizes of the two first substrates.

16. The battery cell according to claim 1, characterized in that, The first insulating part 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; The second 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.

17. The battery cell according to claim 1, characterized in that, The first insulating part includes aluminum oxide and an adhesive, wherein the adhesive includes one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene; The second insulating part includes aluminum oxide and an adhesive, the adhesive including one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene.

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

19. A method for manufacturing a single battery cell, characterized in that, include: An insulating assembly is provided, wherein the insulating assembly includes a plurality of first insulating portions and a plurality of second insulating portions; An electrode assembly is provided, wherein the electrode assembly includes a plurality of first electrodes, a plurality of second electrodes, and an electrolyte layer, the first electrodes and the second electrodes having opposite polarities, the plurality of first electrodes and the plurality of second electrodes being alternately stacked along a stacking direction, the electrolyte layer being used to isolate the first electrodes and the second electrodes, the first electrodes including a first body and a first tab extending from the outer peripheral surface of the first body, the second electrodes including a second body and a second tab extending from the outer peripheral surface of the second body, a portion of the first body protruding from the outer peripheral surface of the second body; The first insulating portion covers at least a portion of the first body from the outside, the second insulating portion covers at least a portion of the second body from the outside, and a portion of the second insulating portion is disposed between two adjacent first body portions; Pressurize the insulating component and the electrode assembly; The insulating components and the electrode components are installed inside the housing.

20. The method for manufacturing a single battery cell according to claim 19, characterized in that, The insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and a second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member. The step of covering at least a portion of the first body from the outside with the first insulating portion, covering at least a portion of the second body from the outside with the second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions includes: The first insulating component and the second insulating component are stacked and connected; The first insulating member covers a portion of the electrode assembly from the outside, such that the first insulating portion of the first insulating member covers at least a portion of the first body from the outside, and the second insulating portion of the first insulating member covers at least a portion of the second body from the outside. The second insulating member is used to cover a portion of the electrode assembly from the outside, such that the first insulating portion of the second insulating member covers at least a portion of the first body from the outside, and the second insulating portion of the second insulating member covers at least a portion of the second body from the outside.

21. The method for manufacturing a single battery cell according to claim 19, characterized in that, The insulating component includes a first insulating member and a second insulating member, wherein the first insulating member includes a first insulating portion and two second insulating portions, and the two second insulating portions of the first insulating member are respectively connected to both sides of the first insulating portion of the first insulating member; the second insulating member includes two first insulating portions and a second insulating portion, and the two first insulating portions of the second insulating member are respectively connected to both sides of the second insulating portion of the second insulating member. The electrode assembly includes a first electrode unit and a second electrode unit. The first electrode unit includes a first electrode plate and two second electrode plates, with the two second electrode plates of the first electrode unit respectively disposed on both sides of the first electrode plate of the first electrode unit. The second electrode unit includes two first electrode plates and one second electrode plate, with the two first electrode plates of the second electrode unit respectively disposed on both sides of the second electrode plate of the second electrode unit. The step of covering at least a portion of the first body from the outside with the first insulating portion, covering at least a portion of the second body from the outside with the second insulating portion, and disposing a portion of the second insulating portion between two adjacent first body portions includes: The first insulating member covers at least a portion of the first electrode unit from the outside, such that the first insulating portion of the first insulating member covers at least a portion of the first body of the first electrode unit from the outside, and the second insulating portion of the first insulating member covers at least a portion of the second body of the first electrode unit from the outside; The second insulating member covers at least a portion of the second electrode unit from the outside, such that the first insulating portion of the second insulating member covers at least a portion of the first body of the second electrode unit from the outside, and the second insulating portion of the second insulating member covers at least a portion of the second body of the second electrode unit from the outside; The first electrode unit having the first insulating element and the second electrode unit having the second insulating element are stacked and connected.

22. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 18.

23. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 18 or a battery device according to claim 22, wherein the battery cell or the battery device is used to store or provide electrical energy.

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