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 arranged alternately 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 an outer circumferential surface of the second main body. An insulating piece comprises a main body part and a protruding part. The main body part is arranged around the first main body of the plurality of first pole pieces and the second main body of the plurality of second pole pieces. The protruding part protrudes from a surface of the main body part towards the second main body. In the stacking direction, at least part of the protruding part is located between adjacent first main bodies. The battery monomer provided by the application can inhibit the edge overlap of the first pole piece and the second pole piece, so as to improve the reliability of the battery monomer.

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 member. 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, and 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 member includes a main body portion and a protrusion portion. The main body portion is disposed around the first body portion of the plurality of first electrodes and the second body portion of the plurality of second electrodes. The protrusion portion protrudes from the surface of the main body portion facing the second body portion. In the stacking direction, at least a portion of the protrusion portion is located between adjacent first bodies.

[0006] The battery cell provided in this application includes an insulating component comprising a main body and a protrusion. The main body surrounds the main body of a plurality of first electrode sheets and the second body of a plurality of second electrode sheets. The protrusion protrudes from the surface of the main body facing the second body, and at least a portion of the protrusion is located between adjacent first bodies. The main body and the protrusion are used to insulate the first and second electrode sheets, thereby reducing the phenomenon of edge warping of the first and second electrode sheets during the pressurization process of the electrode assembly, effectively suppressing edge overlap of the first and second electrode sheets, reducing the occurrence of internal short circuits in the electrode assembly, and improving the reliability of the battery cell.

[0007] According to one embodiment of this application, the main body and the protrusion are integrally formed.

[0008] In these alternative embodiments, the integrally formed main body and protrusions reduce the risk of cracking and detachment when subjected to external forces such as pressure and vibration, enabling the insulating components to stably constrain and support the electrode sheets. It also enhances sealing, reducing the entry of external impurities and moisture into the electrode assembly.

[0009] According to one embodiment of this application, the insulating member includes a plurality of protrusions, which are spaced apart along the stacking direction, and the plurality of protrusions are corresponding one-to-one with a plurality of second bodies.

[0010] In these alternative embodiments, during pressurization, multiple protrusions are spaced apart along the stacking direction, which can evenly distribute pressure to different locations and improve local stress concentration. Multiple spaced protrusions facilitate connection with the electrode assembly, thereby providing connection stability between the two.

[0011] According to one embodiment of this application, a portion of the main body is attached and connected to the outer peripheral surface of the first body.

[0012] In these alternative embodiments, a portion of the main body is attached to and connected to the outer peripheral surface of the first body. On the one hand, this improves the installation stability of the main body; on the other hand, the main body 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.

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

[0014] In these alternative embodiments, this configuration can more effectively reduce the risk of short circuits caused by bridging.

[0015] According to one embodiment of this application, the protrusion is attached to and connected to the outer peripheral surface of the second body.

[0016] In these alternative embodiments, both the protrusion and a portion of the main body are arranged around the second body to provide double protection for the second body and reduce the possibility of edge contact. Moreover, during pressurization, the protrusion adheres to and connects with the outer peripheral surface of the second body, allowing the insulating component to 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.

[0017] According to one embodiment of this application, a protrusion is disposed around a second body, and an insulating member is provided with a third through hole, the third through hole penetrating the body portion and the protrusion, and a portion of the second electrode ear is accommodated in the third through hole.

[0018] In these alternative embodiments, the protrusions surround the second body, which can more effectively reduce the risk of lap short circuits. Furthermore, the protrusions can uniformly absorb the stress of the second body, reducing the occurrence of warping at the edge of the second electrode. In addition, the protrusions can also uniformly support the first electrode, further reducing deformation at the edge of the first electrode.

[0019] According to one embodiment of this application, the end face of the main body along the stacking direction is flush with the end face of the electrode assembly along the stacking direction.

[0020] In these alternative embodiments, the insulating element is able to cover the edge region of the electrode assembly, more effectively suppressing edge overlap between the first and second electrodes and reducing the occurrence of internal short circuits in the electrode assembly.

[0021] According to one embodiment of this application, the main body includes a first part and a second part, the first part and the second part are connected along the stacking direction, the first part is attached to and connected to the outer peripheral surface of the first main body, and the second part is connected to the protrusion.

[0022] In these alternative embodiments, the protrusion is connected to the first part through the second part to form an integral structure, thereby enhancing the stability of the entire insulating component. This two-part arrangement allows the main body to better adapt to the first body and protrusion of different shapes and sizes, improving adaptability and flexibility.

[0023] According to one embodiment of this application, the main body includes a plurality of first portions and a plurality of second portions, which are alternately arranged along the stacking direction.

[0024] In these alternative embodiments, the alternating arrangement of multiple first and second portions allows for a more even distribution and transmission of force among the portions. Whether subjected to external impacts, compression, or internal stress changes due to charging and discharging, the multiple first and second portions can jointly bear and distribute the stress throughout the main body, reducing stress concentration in a particular area and thus reducing the risk of structural deformation and damage to the insulation component.

[0025] According to one embodiment of this application, the insulating member includes a first insulating portion, which includes two first parts, two second parts, and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction, and the two protrusions are respectively connected to the two first parts.

[0026] In these alternative embodiments, this arrangement integrates the structure of the first insulating portion with that of the electrode assembly, achieving efficient space utilization. It also improves the manufacturing precision of the battery cells and the consistency of their internal structure, which in turn contributes to extending the lifespan of the battery cells.

[0027] According to one embodiment of this application, the insulating member includes a plurality of first insulating portions, and a plurality of insulating units are connected along the stacking direction.

[0028] In these alternative embodiments, the plurality of first insulating portions can be adjusted according to the number of first and second electrodes in the insulating member, thereby accommodating electrode assemblies of different heights.

[0029] According to one embodiment of this application, the insulating member includes a second insulating portion, the second insulating member includes a first portion, and the second insulating member is located at one end of the insulating member along the stacking direction.

[0030] In these alternative embodiments, if the first electrode at one end of the electrode assembly along the stacking direction is not protected by the first insulating portion, the first electrode at the end of the electrode assembly can be protected by the first insulating portion, so that the insulating member provides more comprehensive protection for the electrode assembly.

[0031] 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 part is attached to and connected to the outer peripheral surface of the electrolyte layer.

[0032] In these alternative embodiments, the first portion is connected to the electrolyte layer, improving the connection stability of the first portion and reducing the risk of the first portion detaching from the electrode assembly. Moreover, by limiting the first body between the electrolyte layer and the first insulating portion, the first body can be sandwiched between the electrolyte layer and the first insulating portion, effectively limiting the excessive expansion or contraction of the first electrode sheet during the charging and discharging of the battery cell, and reducing the deformation of the electrode assembly.

[0033] According to one embodiment of this application, the first part includes a first sub-part and two second sub-parts, the two second sub-parts being located on both sides of the first sub-part, the first sub-part being attached to and connected to the outer peripheral surface of the first body, and the two second sub-parts being attached to and connected to the outer peripheral surface of two adjacent electrolyte layers respectively.

[0034] In these alternative embodiments, the first portion is configured to be tightly bonded to the electrode assembly, thereby further improving the overall stability of the battery cell structure.

[0035] 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 protrusion is attached to and connected to the outer peripheral surface of the electrolyte layer.

[0036] In these alternative embodiments, a portion of the protrusion is attached to and connected to the outer peripheral surface of the electrolyte layer. On the one hand, the protrusion 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 protrusion and the electrolyte layer improves the connection stability of the protrusion and reduces the risk of the protrusion falling off the electrode assembly.

[0037] According to one embodiment of this application, the protrusion includes a third part and two fourth parts, the two fourth parts being located on both sides of the fourth part, the third part being connected to the outer peripheral surface of the second body, and the two fourth parts being respectively attached to and connected to the outer peripheral surfaces of two adjacent electrolyte layers.

[0038] In these alternative embodiments, the arrangement allows the protrusion to be tightly bonded to the electrode assembly, further improving the overall stability of the battery cell structure.

[0039] According to one embodiment of this application, the insulating element includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer and a modified alumina layer, and a compression-molded polymer layer.

[0040] In these alternative embodiments, the optional insulating elements, made of materials with insulating properties, enable precise control of internal charge transfer, reducing the potential risk of short circuits within the battery cells. Furthermore, these specific materials result in high stability of the insulating elements, reducing their involvement in internal chemical reactions and their impact on battery performance, thus extending the lifespan of the battery cells. This dual protection provided by the insulating elements also improves the stability and reliability of the battery.

[0041] According to one embodiment of this application, the difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the first body is less than or equal to 0.05; the difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the second body is less than or equal to 0.05; and the Poisson's ratio of the insulating component is 0.2 to 0.5.

[0042] In these alternative embodiments, due to the expansion and contraction characteristics of the insulation under pressure and temperature changes, the insulation and the electrode achieve a similar thermal shrinkage rate match, effectively resisting the internal stress caused by changes in temperature and pressure conditions, thereby improving the battery's durability and stability.

[0043] Secondly, this application provides a method for manufacturing a single battery cell, the method comprising:

[0044] 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;

[0045] An insulating slurry is provided, which is then coated onto an electrode assembly and cured to form an insulating component. The insulating component includes a main body and a protrusion. The protrusion protrudes from the main body and surrounds a first body of a plurality of first electrode plates and a second body of a plurality of second electrode plates from the outside. The protrusion is disposed between two adjacent first body portions.

[0046] Apply pressure to the insulating components and electrode assemblies;

[0047] Insulators and electrode assemblies are installed inside the housing.

[0048] The battery cell manufacturing method provided in this application has an insulating component that is an integral structure coated on the outer peripheral surface of the electrode assembly, which simplifies the manufacturing and assembly of the insulating component. During the pressurization process of the electrode assembly, it can also reduce the phenomenon of edge warping of the first and second electrode sheets and effectively suppress edge overlap of the first and second electrode sheets, thereby reducing the occurrence of internal short circuits in the electrode assembly and improving the reliability of the battery cell.

[0049] Thirdly, this application provides a method for manufacturing a single battery cell, the method comprising:

[0050] An insulating component is provided, wherein the insulating component includes a main body and a protrusion, the protrusion being disposed on the main body;

[0051] 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;

[0052] The insulating member surrounds the electrode assembly from the outside, so that the main body surrounds the first body of a plurality of first electrode plates and the second body of a plurality of second electrode plates from the outside, and the protrusion is inserted between two adjacent first body portions;

[0053] Apply pressure to the insulating components and electrode assemblies;

[0054] Insulators and electrode assemblies are installed inside the housing.

[0055] The battery cell manufacturing method provided in this application first provides an insulating component, and then assembles the insulating component with the electrode assembly from the outside, which simplifies the assembly process of the insulating component and the electrode assembly. During the pressurization process of the electrode assembly, it can also reduce the phenomenon of the edges of the first electrode and the second electrode lifting, and effectively suppress the edge overlap of the first electrode and the second electrode, thereby reducing the occurrence of internal short circuits in the electrode assembly and improving the reliability of the battery cell.

[0056] According to one embodiment of this application, the insulating member includes a plurality of first insulating portions, each first insulating portion including two first parts, two second parts and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form part of the main body and the second parts form another part of the main body.

[0057] The step of surrounding the electrode assembly with an insulating member from the outside includes: surrounding the electrode assembly with a plurality of first insulating parts from the outside, such that a first portion of each first insulating part is attached to a first body from the outside, and a protrusion of each first insulating part is inserted between two adjacent first body parts and attached to a second body.

[0058] In these alternative examples, the unitized first insulation portion allows for greater process tolerance, reduces manufacturing difficulty, and facilitates improved integration and production efficiency of the battery cell.

[0059] According to one embodiment of this application, the insulating member includes a first insulating portion, which includes two first parts, two second parts and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form a part of the main body and the second parts form another part of the main body.

[0060] The electrode assembly includes multiple electrode units, wherein each electrode unit includes two first electrode plates and two second electrode plates, and the two first electrode plates and two second electrode plates are alternately arranged along the stacking direction;

[0061] The steps of surrounding the electrode assembly with an insulating element from the outside include:

[0062] The first insulating portion surrounds the electrode unit from the outside, so that the first portion is attached and connected to the first body from the outside, and the protrusion is inserted between two adjacent first body portions and attached and connected to the second body.

[0063] Multiple electrode units having a first insulating part are stacked and connected.

[0064] In these alternative examples, multiple electrode units with first insulating parts are stacked and connected, realizing a modular design of electrode assemblies and insulating parts. Therefore, electrode units with first insulating parts can be stacked and connected according to design requirements, which facilitates installation, replacement, maintenance and upgrades.

[0065] Fourthly, this application provides a battery device including the aforementioned battery cell.

[0066] Fifthly, this application provides an electrical device, including a battery cell or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0067] 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

[0068] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0069] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0070] Figure 2 This is an exploded view of a battery device provided in an embodiment of this application;

[0071] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0072] Figure 4 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0073] 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;

[0074] Figure 6 This is a partial structural schematic diagram of the electrode assembly and insulating component of a battery cell provided in an embodiment of this application;

[0075] 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;

[0076] 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;

[0077] Figure 9 This is a flowchart of a method for manufacturing a single battery cell according to an embodiment of this application;

[0078] Figure 10 This is a flowchart of a method for manufacturing a battery cell according to another embodiment of this application.

[0079] The accompanying drawings may not be drawn to scale.

[0080] Explanation of reference numerals in the attached figures:

[0081] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1a, Battery Module; 1b, First Housing; 1c, Second Housing; 10, Battery Cell; 1, Housing; 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, Insulator; 301, First Insulator; 302, Second Insulator; 31, Main Body; 311, First Section; 3111, First Subsection; 3112, Second Subsection; 312, Second Section; 32, Protrusion; 321, Third Section; 322, Fourth Section; 33, First Through Hole; 34, Second Through Hole; 35, Third Through Hole;

[0082] x, first direction; y, second direction; z, stacking direction. Detailed Implementation

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In this application, "multiple" means two or more (including two).

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0099] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0105] 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.

[0106] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0107] 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.

[0108] Please refer to Figure 2 , Figure 2 Exploded views of battery devices provided in some embodiments of this application.

[0109] In some embodiments, the battery device 100 may include one or more battery cell assemblies for providing voltage and capacity.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, the housing is used to house individual battery cells, and the housing can have various structures.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, the battery device 100 may be an energy storage device.

[0121] 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.

[0122] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0123] 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.

[0124] 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.

[0125] The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0126] 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.

[0127] 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.

[0128] Sulfide solid electrolytes include sulfide crystalline solid electrolytes, sulfide glass, and glass-ceramic solid electrolytes.

[0129] See Figures 3 to 6 , 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; Figure 6This is a partial structural schematic diagram of the electrode assembly and insulating components of a battery cell provided in an embodiment of this application.

[0130] like Figures 3 to 6 As shown, this application proposes a battery cell 10, which includes a housing 1, an electrode assembly 2, and an insulating member 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 member 3 includes a main body portion 31 and a protrusion portion 32. The main body portion 31 is disposed around a first body 211 of a plurality of first electrode plates 21 and a second body 221 of a plurality of second electrode plates 22. The protrusion portion 32 protrudes from the surface of the main body portion 31 toward the second body 221. In the stacking direction z, at least a portion of the protrusion portion 32 is located between adjacent first bodies 211.

[0131] The outer casing 1 has a receiving cavity 11. The electrode assembly 2 is disposed in the receiving cavity 11. The electrode assembly 2 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 member 3 includes a plurality of first insulating portions 301 and a plurality of second insulating portions 302. The plurality of first insulating portions 301 and the plurality of second insulating portions 302 are alternately arranged along the stacking direction z. The first insulating portions 301 are arranged along the outer periphery of the first body 211, and the second insulating portions 302 are arranged along the outer periphery of the second body 221. The second insulating portions 302 protrude from the surface of the first insulating portions 301 facing the first body 211. In the stacking direction z, a portion of the second insulating portions 302 is located between adjacent first bodies 211.

[0132] The outer casing 1 has a receiving cavity 11 for accommodating components such as the electrode assembly 2 and the insulating component 3 to form the internal environment of the battery cell 10.

[0133] 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.

[0134] 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.

[0135] Optionally, the outer shell 1 is made of a material with a certain degree of hardness and strength, such as aluminum or aluminum alloy, so that the outer shell 1 is not easily deformed when subjected to compression or impact.

[0136] 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.

[0137] Electrode assembly 2 is the component in battery cell 10 where electrochemical reactions occur.

[0138] In some examples, the housing 1 may contain one or more electrode assemblies 2.

[0139] 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.

[0140] Optionally, the electrode unit includes two first electrodes 21 and two second electrodes 22, which are stacked along the stacking direction z. The electrolyte layer 23 is used to isolate adjacent first electrodes 21 and second electrodes 22.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] One of the first electrode 21 and the second electrode 22 is a positive electrode, and the other is a negative electrode.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] In other examples, the outer peripheral surface of the first body 211 protrudes beyond the outer peripheral surface of the second body 221.

[0151] 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.

[0152] In some examples, the insulating member 3 includes a main body 31 and a protrusion 32. The main body 31 is disposed around the main body 31 of a plurality of first electrode plates 21 and the second body 221 of a plurality of second electrode plates 22. A portion of the main body 31 is attached to the first body 211. Alternatively, the main body 31 is disposed around the main body 31 of a plurality of first electrode plates 21 and the second body 221 of a plurality of second electrode plates 22. A portion of the main body 31 is spaced apart from and opposite to the first body 211.

[0153] In some examples, the main body 31 is disposed around the main body 31 of the plurality of first electrode plates 21 and the second body 221 of the plurality of second electrode plates 22. The main body 31 may be disposed on a portion of the outer peripheral surface of the main body 31 of the plurality of first electrode plates 21 and a portion of the outer peripheral surface of the second body 221 of the plurality of second electrode plates 22. This is to protect a portion of the first body 211 and the second body 221.

[0154] In other examples, the main body 31 is arranged in a circle around the main body 31 of the plurality of first pole pieces 21 and the second body 221 of the plurality of second pole pieces 22, and avoids the first pole tabs 212 and the second pole tabs 222. This provides more effective protection for the first body 211 and the second body 221.

[0155] In some examples, at least a portion of the protrusion 32 is located between adjacent first bodies 211, and the protrusion 32 is fitted to the outer peripheral surface of the second body 221; alternatively, the protrusion 32 is spaced apart from the outer peripheral surface of the second body 221.

[0156] 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 10.

[0157] At least a portion of the protrusion 32 is located between adjacent first bodies 211, providing support to the first bodies 211 during the pressurization process of the electrode assembly 2. It also absorbs stacking stress during pressurization, improving the structural stability of the second body 221. Furthermore, the second body 221 is protected by both the body portion 31 and the protrusion 32, reducing the likelihood of edge warping of the second electrode 22. During pressurization, at least a portion of the protrusion 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 bodies 211. In particular, when the second body 221 is in contact with the protrusion 32, it also absorbs 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 10.

[0158] In some examples, the protrusion 32 may be provided on a portion of the outer peripheral surface of the second body 221 to protect a portion of the second body 221.

[0159] In other examples, the protrusion 32 is arranged around the outer periphery of the second body 221, and the body 31 and the protrusion 32 avoid the second tab 222. This provides more effective protection for the second body 221.

[0160] In some examples, the main body 31 and the protrusion 32 are integrally formed; alternatively, the main body 31 and the protrusion 32 are detachably connected.

[0161] Optionally, the main body 31 and the protrusion 32 are detachably connected, making it easy to replace the protrusion 32 to adapt to different electrode assemblies 2 and to different thicknesses of the second body 221.

[0162] In some examples, the insulating element 3 includes a main body 31 and a protrusion 32, with a plurality of protrusions 32 spaced apart along the stacking direction z, and the plurality of protrusions 32 corresponding one-to-one with a plurality of second bodies 221.

[0163] Optionally, the insulating member 3 includes a main body 31 and a protrusion 32, with a plurality of protrusions 32 being equidistantly spaced along the stacking direction z.

[0164] The battery cell 10 provided in this application includes an insulating member 3 comprising a main body 31 and a protrusion 32. The main body 31 is disposed around the main body 31 of a plurality of first electrode plates 21 and the second body 221 of a plurality of second electrode plates 22. The protrusion 32 protrudes from the surface of the main body 31 facing the second body 221. At least a portion of the protrusion 32 is located between adjacent first bodies 211. The main body 31 and the protrusion 32 are used for insulation of the first electrode plates 21 and the second electrode plates 22, thereby reducing the phenomenon of edge warping of the first electrode plates 21 and the second electrode plates 22 during the pressurization process of the electrode assembly 2, effectively suppressing the edge overlap of the first electrode plates 21 and the second electrode plates 22, reducing the occurrence of internal short circuits in the electrode assembly 2, and improving the reliability of the battery cell 10. Furthermore, the main body 31 and the protrusion 32 cooperate with each other to form a coherent and tight protective structure, which can provide more comprehensive protection and support for the electrode assembly 2, thereby fixing and constraining the first electrode 21 and the second electrode 22 as a whole, limiting the displacement and deformation of the electrode during the pressurization process, and reducing the possibility of the electrode edges warping due to pressure. In addition, the protective structure formed by the main body 31 and the protrusion 32 allows the various parts of the insulating member 3 to share the force collaboratively. When the electrode assembly 2 is under pressure, the force can be more evenly distributed on the electrode assembly 2 and the insulating member 3, reducing local stress concentration, thereby effectively improving the warping and deformation of the electrode edges, and improving the structural stability and performance safety of the electrode assembly 2.

[0165] According to one embodiment of this application, the main body 31 and the protrusion 32 are integrally formed structures.

[0166] For example, the 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 an insulating component 3, which includes a main body 31 and a protrusion 32.

[0167] For example, the insulating material is prepared into a slurry and coated onto the outer peripheral surface of the electrode assembly 2 by brushing, spraying, or screen printing, and then cured to form an insulating component 3. The insulating component 3 includes a main body portion 31 and a protrusion portion 32.

[0168] In these alternative embodiments, the integrally formed main body 31 and protrusion 32 reduce the risk of cracking and detachment when subjected to external forces such as pressure and vibration, enabling the insulating component 3 to stably constrain and support the electrode sheet. It also enhances sealing, reducing the entry of external impurities and moisture into the electrode assembly 2.

[0169] According to one embodiment of this application, such as Figure 6 As shown, the insulating member 3 includes a plurality of protrusions 32, which are spaced apart along the stacking direction z, and the plurality of protrusions 32 are corresponding one-to-one with a plurality of second bodies 221.

[0170] In some examples, the insulating member 3 includes a plurality of protrusions 32, which are spaced apart along the stacking direction z. The plurality of protrusions 32 are arranged in a one-to-one correspondence with a plurality of second bodies 221. The plurality of protrusions 32 are equidistant along the stacking direction z, or the spacing of the plurality of protrusions 32 along the stacking direction z is not completely equal.

[0171] For example, the insulating member 3 includes N protrusions 32, which are spaced apart along the stacking direction z. The electrode assembly 2 includes 2N second electrode plates 22, and the N protrusions 32 are arranged in a one-to-one correspondence with the second bodies 221 of the even number of second electrode plates 22 among the 2N second electrode plates 22.

[0172] For example, the insulating member 3 includes N protrusions 32, which are spaced apart along the stacking direction z. The electrode assembly 2 includes N second electrode plates 22, and the N protrusions 32 are arranged in a one-to-one correspondence with the second body 221 in the N second electrode plates 22.

[0173] In these alternative embodiments, during pressurization, the multiple protrusions 32 are spaced apart along the stacking direction z, which can uniformly distribute the pressure to different locations and improve local stress concentration. The multiple spaced protrusions 32 facilitate connection with the electrode assembly 2, thereby providing connection stability between the two.

[0174] According to one embodiment of this application, such as Figure 5 and Figure 6 As shown, a portion of the main body 31 is attached to and connected to the outer peripheral surface of the first main body 211.

[0175] In some examples, a portion of the main body 31 is attached to and fixedly connected to the outer peripheral surface of the first body 211. Alternatively, a portion of the main body 31 is detachably connected to the outer peripheral surface of the first body 211.

[0176] In some examples, a portion of the main body 31 is attached to and connected to the outer peripheral surface of the first main body 211, and another portion of the main body 31 is connected to a protrusion, wherein one of the portion of the main body 31 and the other portion are disposed opposite to the electrolyte layer 23 in a direction perpendicular to the stacking direction z.

[0177] For example, a portion of the main body 31 is attached to and connected to the outer peripheral surface of the first main body 211, and a portion of the main body 31 is also attached to and connected to at least a portion of the outer peripheral surface of the electrolyte layer 23, and another portion of the main body 31 is connected to a protrusion.

[0178] For example, a portion of the main body 31 is attached to and connected to the outer peripheral surface of the first main body 211, and another portion of the main body 31 is connected to a protrusion. A portion of the protrusion is attached to and connected to the outer peripheral surface of the first main body 211, and another portion of the protrusion is attached to and connected to at least a portion of the outer peripheral surface of the electrolyte layer 23.

[0179] In these alternative embodiments, a portion of the main body 31 is attached to and connected to the outer peripheral surface of the first body 211. On the one hand, this can improve the installation stability of the main body 31. On the other hand, the main body 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.

[0180] According to one embodiment of this application, such as Figure 5 As shown, the main body 31 is provided with a first through hole 33 and a second through hole 34. A portion of the first electrode tab 212 is accommodated in the first through hole 33, and a portion of the second electrode tab 222 is accommodated in the second through hole 34.

[0181] Exemplarily, the first body 211 and the second body 221 are generally rectangular in shape, and the main body portion 31 is generally a rectangular frame structure surrounding the first body 211. The first body 211 includes two first long sides and two first short sides, one of which is connected to the first electrode tab 212. The second body 221 includes two second long sides and two second short sides, one of which is connected to the second electrode tab 222. The main body portion 31 includes two long frame sides and two short frame sides, the two long frame sides corresponding to the two first long sides and the two second long sides respectively, and the two short frame sides corresponding to the two first short sides and the two second short sides respectively. One of the two first short frame sides is provided with a first through hole 33 and a second through hole 34. 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, and a portion of the second electrode tab 222 is accommodated in the second through hole 34 and extends out of the second through hole 34.

[0182] In these alternative embodiments, this configuration can more effectively reduce the risk of short circuits caused by bridging.

[0183] According to one embodiment of this application, such as Figure 5 and Figure 6 As shown, the protrusion 32 is attached to and connected to the outer peripheral surface of the second body 221.

[0184] In some examples, the protrusion 32 is disposed along the outer periphery of the second body 221, and the second insulating portion 302 may be fitted to a portion of the outer peripheral surface of the second body 221 to protect a portion of the second body 221.

[0185] In other examples, the second insulating portion 302 is attached and connected around the outer perimeter of the second body 221, avoiding the second tab 222, in order to provide more effective protection for the second body 221.

[0186] In some examples, a portion of the protrusion 32 overlaps with the first body 211 in the stacking direction z.

[0187] In other examples, the protrusion 32 overlaps with the first body 211 in the stacking direction z.

[0188] In these alternative embodiments, both the protrusion 32 and a portion of the main body 31 are arranged around the second main body 221 to provide double protection for the second main body 221 and reduce the possibility of edge contact. Moreover, during pressurization, the protrusion 32 is attached to and connected to the outer peripheral surface of the second main body 221, allowing the insulating member 3 to 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.

[0189] According to one embodiment of this application, such as Figure 5 As shown, the protrusion 32 is arranged around the second body 221, and the insulating member 3 is provided with a third through hole 35. The third through hole 35 passes through the body part 31 and the protrusion 32, and a part of the second electrode 222 is accommodated in the third through hole 35.

[0190] For example, in a plane perpendicular to the stacking direction z, the second body 221 is generally rectangular, and the protrusion 32 and the main body 31 are generally rectangular frames 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 electrode 222. The insulating member 3 includes two long frame sides and two short frame sides, with the two long frame sides corresponding one-to-one with the two long sides and the two short frame sides corresponding one-to-one with the two short sides. One of the two short frame sides is provided with a third through hole 35 that passes through the main body 31 and the protrusion 32. A portion of the second electrode 222 is accommodated in the third through hole 35 and extends out of the third through hole 35.

[0191] In these alternative embodiments, the protrusion 32 is disposed around the second body 221, which can more effectively reduce the risk of lap short circuits. Moreover, the protrusion 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 protrusion 32 can also uniformly support the first electrode 21, further reducing deformation at the edge of the first electrode 21.

[0192] According to one embodiment of this application, such as Figure 6 As shown, the end face of the main body 31 along the stacking direction z is flush with the end face of the electrode assembly 2 along the stacking direction z.

[0193] For example, the main body 31 has a first end face and a second end face along the stacking direction z, and the electrode assembly 2 has a third end face and a fourth end face along the stacking direction z. The first end face is flush with the third end face, and the second end face is flush with the fourth end face.

[0194] Optionally, one of the first end face and the second end face is flush with the end face of the protrusion 32 along the stacking direction z.

[0195] In these alternative embodiments, the insulating element 3 is able to cover the edge region of the electrode assembly 2, more effectively suppressing the edge overlap of the first electrode 21 and the second electrode 22, and reducing the occurrence of internal short circuits in the electrode assembly 2.

[0196] See also Figure 7 and Figure 8 , 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; 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.

[0197] According to one embodiment of this application, such as Figure 7 and Figure 8 As shown, the main body 31 includes a first part 311 and a second part 312. The first part 311 and the second part 312 are connected along the stacking direction z. The first part 311 is attached to and connected to the outer peripheral surface of the first main body 211, and the second part 312 is connected to the protrusion 32.

[0198] In some examples, the main body 31 includes a first part 311 and a second part 312, which are connected along the stacking direction z. A portion of the first part 311 is attached to and connected to the outer peripheral surface of the first body 211, and another portion of the first part 311 is attached to and connected to the outer peripheral surface of the electrolyte layer 23. The second part 312 is connected to the protrusion 32.

[0199] For example, the first part 311 includes a first sub-part 3111 and a second sub-part 3112. The second sub-part 3112 is connected to the second part 312 of the first sub-part 3111 along the stacking direction z. The first sub-part 3111 is attached to and connected to the outer peripheral surface of the first body 211, and the second sub-part 3112 is attached to and connected to the outer peripheral surface of the electrolyte layer 23.

[0200] In some examples, the material used to manufacture the first part 311 is different from the material used to manufacture the second part 312.

[0201] In these alternative embodiments, the protrusion 32 is connected to the first part 311 through the second part 312 to form an integral structure, thereby enhancing the stability of the entire insulating member 3. This two-part arrangement allows the main body 31 to better adapt to the first main body 211 and the protrusion 32 of different shapes and sizes, improving adaptability and flexibility.

[0202] According to one embodiment of this application, such as Figure 7 and Figure 8 As shown, the main body 31 includes a plurality of first portions 311 and a plurality of second portions 312, which are alternately arranged along the stacking direction z.

[0203] In some examples, the main body 31 includes a plurality of first portions 311 and a plurality of second portions 312, which are alternately arranged along the stacking direction z. A second portion 312 is provided between two adjacent first portions 311. The first portion 311 is attached to and connected to the outer peripheral surface of the first body 211, and the second portion 312 is connected to the protrusion 32.

[0204] In some examples, the main body 31 includes N+1 first parts 311 and N second parts 312, which are alternately arranged along the stacking direction z. The first parts 311 are attached to and connected to the outer peripheral surface of the first main body 211, and the second parts 312 are connected to the protrusion 32.

[0205] In these alternative embodiments, the alternating arrangement of multiple first portions 311 and multiple second portions 312 allows the force to be transmitted and distributed more evenly among the portions. Whether subjected to external impacts, compression, or internal stress changes caused by charging and discharging, the multiple first portions 311 and second portions 312 can jointly bear and distribute the stress throughout the main body 31, improving stress concentration in a certain area and thus reducing the risk of structural deformation and damage to the insulating component 3.

[0206] According to one embodiment of this application, such as Figure 7 As shown, the insulating member 3 includes a first insulating part 301, which includes two first parts 311, two second parts 312 and two protrusions 32. The two first parts 311 and the two second parts 312 are alternately arranged and connected along the stacking direction z, and the two protrusions 32 are respectively connected to the two first parts 311.

[0207] In some examples, the first insulating portion 301 includes two first parts 311, two second parts 312, and two protrusions 32. The two first parts 311 and two second parts 312 are alternately arranged and connected along the stacking direction z. The two protrusions 32 are respectively connected to the two first parts 311, generally forming an "F" shape. The "F"-shaped first insulating portion 301 and the electrode assembly 2 are fitted together with a tenon and mortise joint, which can firmly connect the insulating component 3 and the electrode assembly 2 together to form a stable whole. During the use of the battery cell 10, even if subjected to external impact, compression, and frequent expansion and contraction deformation of the electrode assembly 2 during charging and discharging, it is not easy to loosen or deform. The F-shaped structure of the first insulating portion 301 allows the insulating component 3 to be manufactured in a modular manner, which is convenient for assembly with the electrode assembly 2 and allows for a larger process error tolerance. It also simplifies the assembly process, improves production efficiency, and reduces production costs. In addition, the internal structure of the battery cell 10 is more compact and regular, which is beneficial to improving the overall performance and reliability of the battery cell 10.

[0208] In some examples, the insulating element 3 includes a plurality of first insulating portions 301 generally in an "F" shape, the plurality of first insulating portions 301 being disposed along the stacking direction z.

[0209] In some examples, the insulating element 3 includes a first insulating portion 301, which is assembled with the electrode assembly 2 to form a minimum unit; alternatively, multiple first insulating portions 301 are assembled with the electrode assembly 2.

[0210] Optionally, the first insulating part 301 is formed by injection molding or compression molding, extrusion molding or blow molding, or one or more of these methods.

[0211] In these alternative embodiments, this arrangement allows the structure of the first insulating portion 301 to be integrated with that of the electrode assembly 2, achieving efficient space utilization. It also improves the manufacturing precision of the battery cell 10 and the consistency of its internal structure, thus contributing to a longer lifespan. Furthermore, the smallest unit of the electrode assembly 2 formed by the first portion 311 matching the two first electrode plates 21 and the two second electrode plates 22 provides greater energy density and reduces the number of assembly steps. Additionally, when the F-shaped structure is attached and connected to the outer peripheral surfaces of the first body 211 and the second body 221, it can constrain the electrode assembly 2 in the stacking direction z, maintaining relative stability in position and spacing of each electrode plate during charging and discharging, resulting in a more uniform current distribution, improved performance consistency and stability of the electrode assembly 2, and increased charging and discharging efficiency and lifespan.

[0212] According to one embodiment of this application, such as Figure 8As shown, the insulating member 3 includes a plurality of first insulating portions 301, and a plurality of insulating units are connected along the stacking direction z.

[0213] In some examples, the electrode assembly 2 includes a plurality of first electrode units, each first electrode unit including two first electrode plates 21 and two second electrode plates 22, the two first electrode plates 21 and the two second electrode plates 22 being alternately arranged along the stacking direction z, and the electrolyte layer 23 being used to isolate the first electrode plates 21 and the second electrode plates 22.

[0214] For example, the electrode assembly 2 includes a plurality of first electrode units, and an insulating member 3 is provided, the insulating member 3 including a plurality of first insulating portions 301. The plurality of first electrode units and the plurality of first insulating portions 301 are assembled one by one, and then the plurality of first electrode units having the first insulating portions 301 are stacked and connected.

[0215] In these alternative embodiments, the plurality of first insulating portions 301 can be adjusted according to the number of first electrode plates 21 and second electrode plates 22 in the insulating member 3, thereby adapting to electrode assemblies 2 of different heights.

[0216] According to one embodiment of this application, such as Figure 7 and Figure 8 As shown, the insulating member 3 includes a second insulating portion 302, the second insulating member 3 includes a first portion 311, and the second insulating member 3 is located at one end of the insulating member 3 along the stacking direction z.

[0217] For example, the insulating member 3 includes a plurality of first insulating portions 301 and at least one second insulating portion 302. The plurality of first insulating portions 301 are disposed along the stacking direction z, and the second insulating portion 302 is located at one or both ends of the plurality of first insulating portions 301 along the stacking direction z.

[0218] In some examples, the first insulating part 301 is connected to the second insulating part 302.

[0219] In these alternative embodiments, if the first electrode 21 at one end of the electrode assembly 2 along the stacking direction z is not protected by the first insulating part 301, the first electrode 21 at the end of the electrode assembly 2 can be protected by the first insulating part 301, so that the insulating member 3 provides more comprehensive protection for the electrode assembly 2.

[0220] According to one embodiment of this application, such as Figure 7 As shown, 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 part 311 is attached to and connected to the outer peripheral surface of the electrolyte layer 23.

[0221] 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.

[0222] 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.

[0223] 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 part 311 is attached and connected to the outer peripheral surface of the first body 211, and another portion is attached and connected to the outer peripheral surface of the electrolyte layer 23.

[0224] Electrolyte slurry is coated on the two opposing surfaces of the first body 211, and the electrolyte slurry is cured to form an electrolyte layer 23.

[0225] In these alternative embodiments, the first portion 311 is connected to the electrolyte layer 23, improving the connection stability of the first portion 311 and reducing the risk of the first portion 311 detaching from the electrode assembly 2. Moreover, by limiting the first body 211 between the electrolyte layer 23 and the first insulating portion 301, the first body 211 can be effectively sandwiched between the electrolyte layer 23 and the first insulating portion 301 during the charging and discharging of the battery cell 10, thereby effectively limiting the excessive expansion or contraction of the first electrode 21 and reducing the deformation of the electrode assembly 2.

[0226] According to one embodiment of this application, such as Figure 7 As shown, the first part 311 includes a first sub-part 3111 and two second sub-parts 3112. The two second sub-parts 3112 are located on both sides of the first sub-part 3111. The first sub-part 3111 is attached to and connected to the outer peripheral surface of the first body 211. The two second sub-parts 3112 are respectively attached to and connected to the outer peripheral surface of two adjacent electrolyte layers 23.

[0227] 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.

[0228] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the first body 211.

[0229] In these alternative embodiments, the first portion 311 is configured such that it is tightly bonded to the electrode assembly 2, thereby further improving the overall structural stability of the battery cell 10.

[0230] According to one embodiment of this application, such as Figure 8 As shown, 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 protrusion 32 is attached to and connected to the outer peripheral surface of the electrolyte layer 23.

[0231] 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.

[0232] 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.

[0233] 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 protrusion 32 is attached to and connected to the outer peripheral surface of the second body 221, and another portion of the protrusion 32 is attached to and connected to the outer peripheral surface of the electrolyte layer 23.

[0234] 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.

[0235] In these alternative embodiments, a portion of the protrusion 32 is attached to and connected to the outer peripheral surface of the electrolyte layer 23. On the one hand, the protrusion 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 protrusion 32 and the electrolyte layer 23 improves the connection stability of the protrusion 32 and reduces the risk of the protrusion 32 detaching from the electrode assembly 2. Moreover, during the charging and discharging process of the battery cell 10, the volume of the first electrode 21 and the second electrode 22 is prone to expansion and contraction. The protrusion 32 can provide mechanical support, which can limit the excessive expansion or contraction of the volume of the first electrode 21 and the second electrode 22 and reduce the deformation of the electrode assembly 2. That is, the connection of the protrusion 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.

[0236] According to one embodiment of this application, such as Figure 8 As shown, the protrusion 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. The two fourth parts 322 are respectively attached to and connected to the outer peripheral surfaces of two adjacent electrolyte layers 23.

[0237] The protrusion 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.

[0238] For example, the protrusion 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. The two fourth parts 322 are located on both sides of the third part 321. The two fourth parts 322 are connected to the outer peripheral surfaces of two adjacent electrolyte layers 23. The end face of the fourth part 322 facing away from the second part 312 abuts against the first body 211.

[0239] 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.

[0240] Optionally, the second main body 221 31 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.

[0241] Alternatively, the electrolyte layer 23 is adhered to opposite sides of the second body 221.

[0242] In these alternative embodiments, the protrusion 32 is configured such that it is tightly bonded to the electrode assembly 2, thereby further improving the overall structural stability of the battery cell 10.

[0243] According to one embodiment of this application, the insulating member 3 includes two first substrates and two second substrates. The two first substrates are spaced apart along a first direction x, and the two second substrates are spaced apart along a second direction y. The two second substrates are located between the two first substrates, and the first substrates and second substrates are connected. A portion of the main body 31 and a portion of a plurality of protrusions 32 form a first substrate, and another portion of the main body 31 and another portion of the plurality of protrusions 32 form a first substrate. The first direction x, the second direction y, and the stacking direction z are all perpendicular to each other. This arrangement facilitates the assembly of the insulating member 3 onto the electrode assembly 2.

[0244] According to one embodiment of this application, in the second direction y, the size of the first substrate is equal to the size of the first body 211. In the first direction x, the size of the second substrate is equal to the size of the first body 211 and the sum of the sizes of the two first substrates.

[0245] According to one embodiment of this application, the insulating element 3 includes one or more of the following: a UV adhesive layer, a hot melt adhesive layer, a ceramic layer, a modified alumina layer, and a compression-molded polymer layer.

[0246] Optionally, the insulating element 3 is a modified alumina layer. It has high strength and low modulus.

[0247] In these alternative embodiments, the optional insulator 3 is made of a material with insulating properties to precisely control internal charge transfer, reducing the potential short-circuit risk inside the battery cell 10. Furthermore, these specific materials give the insulator 3 high stability, reducing its involvement in internal chemical reactions and their impact on battery performance, thus extending the lifespan of the battery cell 10. This dual protection of the insulator 3 also improves the stability and reliability of the battery.

[0248] According to one embodiment of this application, the insulating component 3 includes aluminum oxide and an adhesive, the adhesive being one or more of polyimide, polycarbonate, polystyrene, polypropylene, and polyethylene. This configuration enhances the adhesion of the insulating component 3, thereby improving the connection stability between the insulating component 3 and the electrode assembly 2. Furthermore, the use of the adhesive provides the adhesive component with a certain degree of flexibility, allowing it to adapt to volume changes in the first electrode 21 and the second electrode 22 during pressurization and charging / discharging processes. It can also buffer stress through its own deformation, thereby improving the overall stability of the battery cell 10.

[0249] According to one embodiment of this application, the insulating member 3 is a porous insulating member 3 or a honeycomb insulating member 3. This configuration enables the insulating member 3 to have a high stress dispersion efficiency.

[0250] According to one embodiment of this application, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the first body 211 is less than or equal to 0.05. The difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the second body 221 is less than or equal to 0.05. The Poisson's ratio of the insulating element 3 is between 0.2 and 0.5.

[0251] In some examples, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the first body 211 is 0.01, 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, 0.017, 0.018, 0.019, 0.02, 0.021, 0.022, 0.023, 0.024, 0.025, 0.026, 0.027, 0.028, 0.0 29, 0.03, 0.031, 0.032, 0.033, 0.034, 0.035, 0.036, 0.037, 0.038, 0.039, 0.04, 0.041, 0.042, 0.043, 0.044, 0.045, 0.046, 0.047, 0.048, 0.049, 0.05, or any other range consisting of any two of the above endpoints.

[0252] In some examples, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the second body 221 is 0.01, 0.011, 0.012, 0.013, 0.014, 0.015, 0.016, 0.017, 0.018, 0.019, 0.02, 0.021, 0.022, 0.023, 0.024, 0.025, 0.026, 0.027, 0.028, 0.0 29, 0.03, 0.031, 0.032, 0.033, 0.034, 0.035, 0.036, 0.037, 0.038, 0.039, 0.04, 0.041, 0.042, 0.043, 0.044, 0.045, 0.046, 0.047, 0.048, 0.049, 0.05, or any other range consisting of any two of the above endpoints.

[0253] Optionally, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the first body 211 is less than or equal to 0.05 and greater than or equal to 0.01.

[0254] Alternatively, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the first body 211 is less than or equal to 0.03 and greater than or equal to 0.01.

[0255] Optionally, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the second body 221 is less than or equal to 0.05 and greater than or equal to 0.01.

[0256] Alternatively, the difference between the Poisson's ratio of the insulating element 3 and the Poisson's ratio of the second body 221 is less than or equal to 0.03 and greater than or equal to 0.01.

[0257] In some examples, the Poisson's ratio of the insulator 3 is 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.5, or in other ranges consisting of any two of the above endpoints.

[0258] In these alternative embodiments, due to the expansion and contraction characteristics of the insulating element 3 under pressure and temperature changes, the insulating element 3 and the electrode achieve a similar thermal shrinkage rate match, effectively resisting the internal stress caused by changes in temperature and pressure conditions, thereby improving the durability and stability of the battery.

[0259] See Figure 9 , Figure 9This is a flowchart of a method for manufacturing a battery cell according to an embodiment of this application.

[0260] Secondly, this application provides a method for manufacturing a single battery cell, the method comprising:

[0261] Step S100: 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.

[0262] Step S200: Provide insulating slurry, apply the insulating slurry to the electrode assembly, and cure to form an insulating component. The insulating component includes a main body and a protrusion. The protrusion protrudes from the main body and surrounds the first main body of a plurality of first electrode sheets and the second main body of a plurality of second electrode sheets from the outside. The protrusion is disposed between two adjacent first main bodies.

[0263] Step S300: Apply pressure to the insulating components and electrode assembly.

[0264] Step S400: Install the insulating components and electrode assembly into the housing.

[0265] The battery cell manufacturing method provided in this application has an insulating component that is an integral structure coated on the outer peripheral surface of the electrode assembly, which simplifies the manufacturing and assembly of the insulating component. During the pressurization process of the electrode assembly, it can also reduce the phenomenon of edge warping of the first and second electrode sheets and effectively suppress edge overlap of the first and second electrode sheets, thereby reducing the occurrence of internal short circuits in the electrode assembly and improving the reliability of the battery cell.

[0266] See Figure 10 , Figure 10 This is a flowchart of a method for manufacturing a battery cell according to another embodiment of this application.

[0267] Thirdly, this application provides a method for manufacturing a single battery cell, the method comprising:

[0268] Step S100': Provide an insulating component, wherein the insulating component includes a main body and a protrusion, the protrusion being disposed on the main body.

[0269] Step S200' provides 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 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.

[0270] Step S300' The insulating member surrounds the electrode assembly from the outside, so that the main body surrounds the first body of the plurality of first electrodes and the second body of the plurality of second electrodes from the outside, and the protrusion is inserted between two adjacent first body portions.

[0271] Step S400' applies pressure to the insulating components and electrode assembly.

[0272] Step S500' Install the insulating components and electrode assembly into the housing.

[0273] The battery cell manufacturing method provided in this application first provides an insulating component, and then assembles the insulating component with the electrode assembly from the outside, which simplifies the assembly process of the insulating component and the electrode assembly. During the pressurization process of the electrode assembly, it can also reduce the phenomenon of the edges of the first electrode and the second electrode lifting, and effectively suppress the edge overlap of the first electrode and the second electrode, thereby reducing the occurrence of internal short circuits in the electrode assembly and improving the reliability of the battery cell.

[0274] According to one embodiment of this application, the insulating member includes a plurality of first insulating portions, each first insulating portion including two first parts, two second parts and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form part of the main body and the second parts form another part of the main body.

[0275] The step of surrounding the electrode assembly with an insulating member from the outside includes: surrounding the electrode assembly with a plurality of first insulating parts from the outside, such that a first portion of each first insulating part is attached to a first body from the outside, and a protrusion of each first insulating part is inserted between two adjacent first body parts and attached to a second body.

[0276] In some examples, multiple first insulating portions are stacked and connected, and then each first insulating portion is attached to the electrode assembly from the outside.

[0277] In other examples, multiple first insulating parts are attached to the electrode assembly from the outside, and then the multiple first insulating parts are connected together.

[0278] In some examples, the outer peripheral surface of the first body is flush with the outer peripheral surface of the electrolyte layer. The first insulating portion is attached to the electrode assembly from the outside, such that a first portion of the first insulating portion is attached to the first body and the electrolyte layer from the outside, and a protrusion of the first insulating portion is attached to the second body from the outside.

[0279] In other examples, the first insulating portion is attached to the electrode assembly from the outside, such that a first portion of the first insulating portion is attached to the first body from the outside, and a protrusion of the first insulating portion is attached to the second body and the electrolyte layer from the outside.

[0280] In these alternative examples, the unitized first insulation portion allows for greater process tolerance, reduces manufacturing difficulty, and facilitates improved integration and production efficiency of the battery cell.

[0281] According to one embodiment of this application, the insulating member includes a first insulating portion, which includes two first parts, two second parts, and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form part of the main body, and the second parts form another part of the main body.

[0282] The electrode assembly includes multiple electrode units, wherein each electrode unit includes two first electrode plates and two second electrode plates, which are alternately arranged along the stacking direction.

[0283] The step of surrounding the electrode assembly with an insulating element from the outside includes...

[0284] The first insulating portion surrounds the electrode unit from the outside, so that the first portion is attached and connected to the first body from the outside, and the protrusion is inserted between two adjacent first body portions and attached and connected to the second body.

[0285] Multiple electrode units having a first insulating part are stacked and connected.

[0286] In these alternative examples, multiple electrode units with first insulating parts are stacked and connected, realizing a modular design of electrode assemblies and insulating parts. Therefore, electrode units with first insulating parts can be stacked and connected according to design requirements, which facilitates installation, replacement, maintenance and upgrades.

[0287] Fourthly, this application provides a battery device including the aforementioned battery cell.

[0288] Fifthly, this application provides an electrical device, including a battery cell or a battery device as described above, wherein the battery cell or battery device is used to store or provide electrical energy.

[0289] 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 component. The housing 1 has a receiving cavity 11. The electrode assembly 2 is disposed within 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. 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.

[0290] The insulating component includes a main body 31 and a plurality of protrusions 32. The main body 31 is disposed around a first body 211 of a plurality of first electrode plates 21 and a second body 221 of a plurality of second electrode plates 22. A portion of the main body 31 is attached to and connected to the outer peripheral surface of the first body 211. The main body 31 is provided with a first through hole 33, and a portion of a first electrode tab 212 is accommodated in the first through hole 33. The main body 31 includes a plurality of first portions 311 and a plurality of second portions 312, which are alternately arranged along the stacking direction z. The first portions 311 and the second portions 312 are connected along the stacking direction z. The first portions 311 are attached to and connected to the outer peripheral surface of the first body 211, and the second portions 312 are connected to the protrusions 32. The plurality of protrusions 32 are spaced apart along the stacking direction z, and the plurality of protrusions 32 are corresponding one-to-one with the plurality of second bodies 221. The protrusion 32 protrudes from the surface of the main body 31 facing the second main body 221, and at least a portion of the protrusion 32 is located between adjacent first main bodies 211 in the stacking direction z. The protrusion 32 is attached to and connected to the outer peripheral surface of the second main body 221. The insulating member is provided with a third through hole 35, which passes through the main body 31 and the protrusion 32, and a portion of the second electrode tab 222 is accommodated in the third through hole 35. The end face of the main body 31 along the stacking direction z is flush with the end face of the electrode assembly 2 along the stacking direction z.

[0291] The insulating component includes multiple first insulating portions 301 and second insulating portions, and multiple insulating units are connected along the stacking direction z. Each first insulating portion 301 includes two first parts 311, two second parts 312, and two protrusions 32. The two first parts 311 and two second parts 312 are alternately arranged and connected along the stacking direction z, and the two protrusions 32 are respectively connected to the two first parts 311. The second insulating component 302 includes a first part 311, and the second insulating component 302 is located at one end of the insulating component along 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 part 311 is attached to and connected to the outer peripheral surface of the electrolyte layer 23. The first part 311 includes a first sub-part 3111 and two second sub-parts 3112. The two second sub-parts 3112 are located on both sides of the first sub-part 3111. The first sub-part 3111 is attached to and connected to the outer peripheral surface of the first body 211, and the two second sub-parts 3112 are respectively attached to and connected to the outer peripheral surfaces of two adjacent electrolyte layers 23. The insulating component 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 difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the first body 211 is less than or equal to 0.05. The difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the second body 221 is less than or equal to 0.05. The Poisson's ratio of the insulating component is between 0.2 and 0.5.

[0292] 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 arranged 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 member includes a main body and a protrusion, the main body being disposed around a first body of a plurality of first electrodes and a second body of a plurality of second electrodes, the protrusion protruding from a surface of the main body toward the second body, and at least a portion of the protrusion being located between adjacent first bodies in the stacking direction.

2. The battery cell according to claim 1, characterized in that, The main body and the protrusion are integrally formed.

3. The battery cell according to claim 1, characterized in that, The insulating component includes a plurality of protrusions, which are spaced apart along the stacking direction, and each of the protrusions corresponds to a plurality of the second bodies.

4. The battery cell according to claim 1, characterized in that, A portion of the main body is attached to and connected to the outer peripheral surface of the first body.

5. The battery cell according to claim 1, characterized in that, The main body is provided with a first through hole and a second through hole, a portion of the first electrode tab is accommodated in the first through hole, and 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 protrusion is attached to and connected to the outer peripheral surface of the second body.

7. The battery cell according to claim 1, characterized in that, The protrusion is arranged around the second body, and the insulating member is provided with a third through hole, which passes through the body and the protrusion, and a portion of the second electrode is accommodated in the third through hole.

8. The battery cell according to claim 1, characterized in that, The end face of the main body along the stacking direction is flush with the end face of the electrode assembly along the stacking direction.

9. The battery cell according to claim 1, characterized in that, The main body includes a first part and a second part, which are connected along the stacking direction. The first part is attached to and connected to the outer peripheral surface of the first main body, and the second part is connected to the protrusion.

10. The battery cell according to claim 9, characterized in that, The main body includes a plurality of first parts and a plurality of second parts, which are alternately arranged along the stacking direction.

11. The battery cell according to claim 10, characterized in that, The insulating component includes a first insulating portion, which includes two first parts, two second parts, and two protrusions. The two first parts and two second parts are alternately arranged and connected along the stacking direction, and the two protrusions are respectively connected to the two first parts.

12. The battery cell according to claim 11, characterized in that, The insulating component includes a plurality of first insulating portions, and the plurality of insulating units are connected along the stacking direction.

13. The battery cell according to claim 11, characterized in that, The insulating element includes a second insulating portion, the second insulating element includes the first portion, and the second insulating element is located at one end of the insulating element along the stacking direction.

14. The battery cell according to claim 11, 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 part is attached and connected to the outer peripheral surface of the electrolyte layer.

15. The battery cell according to claim 14, characterized in that, The first part includes a first sub-part and two second sub-parts, the two second sub-parts being located on both sides of the first sub-part. The first sub-part is attached to and connected to the outer peripheral surface of the first body, and the two second sub-parts are respectively attached to and connected to the outer peripheral surface of two adjacent electrolyte layers.

16. The battery cell according to claim 11, 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 protrusion is attached to and connected to the outer peripheral surface of the electrolyte layer.

17. The battery cell according to claim 16, characterized in that, The protrusion includes a third part and two fourth parts, the two fourth parts are located on both sides of the fourth part, the third part is connected to the outer peripheral surface of the second body, and the two fourth parts are respectively attached to and connected to the outer peripheral surfaces of the two adjacent electrolyte layers.

18. The battery cell according to claim 1, characterized in that, The insulating component 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.

19. The battery cell according to claim 1, characterized in that, The difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the first body is less than or equal to 0.05; The difference between the Poisson's ratio of the insulating component and the Poisson's ratio of the second body is less than or equal to 0.05; The Poisson's ratio of the insulating element is 0.2 to 0.

5.

20. A method for manufacturing a single battery cell, characterized in that, include: 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; An insulating slurry is provided, which is then coated onto the electrode assembly and cured to form an insulating component. The insulating component includes a main body and a protrusion. The protrusion protrudes from the main body and surrounds the first main body of the plurality of first electrode sheets and the second main body of the plurality of second electrode sheets from the outside. The protrusion is disposed between two adjacent first main body portions. Pressurize the insulating component and the electrode assembly; The insulating element and the electrode assembly are installed inside the housing.

21. A method for manufacturing a single battery cell, characterized in that, include: An insulating member is provided, wherein the insulating member includes a main body portion and a protrusion portion, the protrusion portion being disposed protruding from the main body portion; 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 insulating member is wrapped around the electrode assembly from the outside, such that the body portion surrounds the first body of the plurality of first electrodes and the second body of the plurality of second electrodes from the outside, and such that the protrusion is inserted between two adjacent first body portions; Pressurize the insulating component and the electrode assembly; The insulating element and the electrode assembly are installed inside the housing.

22. The method for manufacturing a single battery cell according to claim 21, characterized in that, The insulating component includes a plurality of first insulating portions, each first insulating portion including two first parts, two second parts and two protrusions. The two first parts and the two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form a part of the main body and the second parts form another part of the main body. The step of surrounding the electrode assembly from the outside with the insulating element includes: Multiple first insulating portions are respectively wrapped around the electrode assembly from the outside, such that the first portion of each first insulating portion is attached and connected to the first body from the outside, and the protrusion of each first insulating portion is inserted between two adjacent first body portions and attached and connected to the second body.

23. The method for manufacturing a single battery cell according to claim 21, characterized in that, The insulating component includes a plurality of first insulating portions, each first insulating portion including two first parts, two second parts and two protrusions. The two first parts and the two second parts are alternately arranged and connected along the stacking direction. The two protrusions are respectively connected to the two first parts. The first parts form a part of the main body and the second parts form another part of the main body. The electrode assembly includes multiple electrode units, wherein each electrode unit includes two first electrode plates and two second electrode plates, and the two first electrode plates and two second electrode plates are alternately arranged along the stacking direction; The step of surrounding the electrode assembly from the outside with the insulating element includes: Each of the first insulating portions surrounds each of the electrode units from the outside, such that the first portion is attached and connected to the first body from the outside, and the protrusion is inserted between two adjacent first body portions and attached and connected to the second body. Multiple electrode units having the first insulating portion are stacked and connected.

24. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 19.

25. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 19 or a battery device according to claim 24, wherein the battery cell or the battery device is used to store or provide electrical energy.

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