Battery monomer, battery device and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device. Each battery cell comprises a shell; the electrode assembly is arranged in the shell, and a tab is arranged at the end part of the electrode assembly; the insulating coating piece comprises a plastic deformation shrinkage part and a main body part connected with the plastic deformation shrinkage part; the plastic deformation shrinkage part is coated on the end surface of the tab, and the main body part is at least coated on the periphery of the electrode assembly; the periphery of the electrode assembly is further coated with an insulating layer, and the periphery of the insulating layer is coated with the end, away from the plastic deformation shrinkage part, of the main body part. Due to the fact that deformation of the plastic deformation is irreversible deformation, reliable contraction is achieved, the rebound risk of the part of the insulation wrapping piece on the end face of the electrode lug is reduced, the insulation reliability is improved, and the influence of the insulation wrapping piece on shell entering of the electrode assembly is reduced. In addition, the insulation coating piece and the insulation layer are connected into a whole, insulation protection can be carried out on the periphery of the whole electrode assembly, and the risk of short circuit between the tab and the shell is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] Cylindrical battery cells typically use an electrode assembly with tabs at both ends—a positive tab on one end and a negative tab on the other. However, during subsequent use, if the battery is shaken, the tabs on the electrode assembly may come into contact with the battery casing, causing a short circuit. Therefore, a layer of insulating tape is typically applied to the end faces of the tabs. In related art, the insulating tape is applied and then placed into the casing along with the electrode assembly. However, before placement, the tape can rebound and warp, rendering the insulation between the tabs and the casing ineffective. Utility Model Content

[0004] In view of the problem, the present application provides a battery cell, a battery device and an electrical device, which can alleviate the problem of insulation failure between the tab and the shell caused by the rebound and warping of the insulating tape.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] case;

[0007] The electrode assembly is arranged in the shell, and the end of the electrode assembly is provided with a pole ear;

[0008] And an insulating covering, including a plastic deformation shrinkage portion and a main body portion connected to the plastic deformation shrinkage portion; the plastic deformation shrinkage portion is coated on the end face of the electrode ear, and the main body portion is at least coated on the periphery of the electrode assembly; the periphery of the electrode assembly is also coated with an insulating layer, and one end of the main body portion away from the plastic deformation shrinkage portion is coated on the periphery of the insulating layer.

[0009] For the above-mentioned battery cell, when the electrode tab of the electrode assembly is covered by the insulating covering, the main body can at least cover the outer periphery of the electrode assembly to insulate at least the outer periphery of the electrode tab of the electrode assembly from the shell, and the plastic deformation shrinkage component can cover the end face of the tab to insulate the end face of the tab from the shell. Since the deformation of plastic deformation is irreversible, the plastic deformation shrinkage component can achieve reliable shrinkage, reducing the rebound risk of the insulating covering on the end face of the tab, improving the reliability of the insulating covering in insulating the shell and the tab, and reducing the influence of the insulating covering on the electrode assembly entering the shell.

[0010] In addition, by wrapping the main part of the insulating covering on the outer periphery of the insulating layer, the insulating covering and the insulating layer can be connected as one, thereby providing insulation protection for the outer periphery of the entire electrode assembly and reducing the risk of short circuit between the electrode tab and the shell of the electrode assembly.

[0011] In some embodiments, the plastic deformation shrinkage portion is annular, and the main body portion extends outward along the outer circumference of the plastic deformation shrinkage portion.

[0012] By setting the plastic deformation shrinkage portion to be annular, the plastic deformation shrinkage portion can be made to shrink and move closer to the middle of the electrode assembly as a whole, thereby covering the end face of the electrode tab along the circumferential direction, further reducing the risk of rebound of the insulating covering part of the end face of the electrode tab, improving the reliability of the insulating covering for insulating between the shell and the electrode tab, and reducing the impact of the insulating covering on the insertion of the electrode assembly into the shell.

[0013] In some embodiments, the plastically deformable shrinkage portion is configured as a thermoplastically deformable shrinkage portion.

[0014] The method of causing the material to undergo plastic deformation by heating the material is simple and reliable. In addition, it can also reduce the impact on the structure of the electrode assembly.

[0015] In some embodiments, the main body portion covers the end surface of the tab and the outer periphery of the electrode assembly.

[0016] By extending part of the main body to the end face of the tab, the plastic deformation shrinkage part can be brought closer to the center of the electrode assembly, reducing the inner ring size of the plastic deformation shrinkage part and further reducing the rebound risk of the insulating covering part of the end face of the tab.

[0017] In some embodiments, the battery cell further includes a current collecting plate connected to the end surface of the tab, and the plastically deformed and shrunk portion is coated on a surface of the current collecting plate facing away from the tab.

[0018] Since the collecting plate is connected to the end face of the pole ear, when the insulating covering covers the end face of the pole ear, the plastic deformation and shrinkage part can be directly covered on the surface of the side of the collecting plate facing away from the pole ear, so that the insulating covering can be arranged around the outer periphery of the collecting plate, reducing the risk of short circuit between the collecting plate and the pole ear and the shell, and improving the insulation effect.

[0019] In some embodiments, the main body portion is coated on a surface of the current collecting plate facing away from the tab, an end surface of the tab, and an outer periphery of the electrode assembly.

[0020] That is to say, the projected boundary of the collecting plate along the height direction of the electrode assembly toward the electrode assembly is on the inner side of the boundary of the pole ear at the end of the electrode assembly, so that part of the end face of the pole ear is still exposed outside the collecting plate. Therefore, the main body is used to cover the surface of the side of the collecting plate facing away from the pole ear, the end face of the pole ear and the outer periphery of the electrode assembly, thereby reducing the risk of short circuit between the collecting plate and the pole ear and the shell, and improving the insulation effect.

[0021] In some embodiments, a distance between an outer edge of the plastically deformed shrinkage portion and an outer edge of the current collecting plate is 10 mm to 20 mm.

[0022] When the distance between the outer edge of the plastic deformation shrinkage part and the outer edge of the collecting plate is 10 mm to 20 mm, the plastic deformation shrinkage part can be a certain distance away from the outer periphery of the collecting plate, reducing the risk of the plastic deformation shrinkage part detaching from the outer periphery of the collecting plate, thereby improving the shrinkage reliability of the plastic deformation shrinkage part.

[0023] In some embodiments, along the radial direction of the plastic deformation shrinkage portion, the width of the plastic deformation shrinkage portion is no greater than 5 mm.

[0024] When the width of the plastic deformation shrinkage portion is too large, the plastic deformation shrinkage process is difficult to control, reducing the shrinkage reliability of the plastic deformation shrinkage portion. Therefore, the embodiment of the present application sets the width of the plastic deformation shrinkage portion to no more than 5 mm, so that the width of the plastic deformation shrinkage portion is within an appropriate range, thereby improving the controllability of the plastic deformation shrinkage process and further improving the shrinkage reliability of the plastic deformation shrinkage portion.

[0025] In some embodiments, the plastic deformation shrinkage portion and the main body portion are compositely connected.

[0026] Since the plastic deformation shrinkage part needs to be plastically deformed before being formed, while the main part does not need to be plastically deformed, the difficulty of the manufacturing process can be reduced when the material properties of the two are different. Further, the two can be connected in a composite manner, which can improve the connection reliability between the two and thereby improve the insulation reliability.

[0027] In some embodiments, the plastic deformation shrinkage portion and the main body portion are bonded or pressure bonded.

[0028] The above-mentioned method of bonding and compounding the plastic deformation shrinkage part and the main body is simple, and the connection is relatively reliable. It causes little damage to the structures of the plastic deformation shrinkage part and the main body, and makes the insulation reliability of the plastic deformation shrinkage part and the main body high.

[0029] The above-mentioned pressure-compound connection method between the plastic deformation shrinkage part and the main body can cause plastic deformation and molecular diffusion at the interface between the two, forming a gapless physical connection and improving insulation reliability.

[0030] In a second aspect, a battery device is provided, comprising the battery cell according to any of the above embodiments.

[0031] In a third aspect, an electrical device is also provided, comprising the battery device in any of the above embodiments.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0034] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0035] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments.

[0036] Figure 3 is a schematic structural diagram of a battery cell according to one or more embodiments.

[0037] Figure 4 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0038] Figure 5 FIG. 1 is a schematic structural diagram of an electrode assembly of a battery cell according to one or more embodiments.

[0039] Figure 6 for Figure 5 The schematic diagram of the partial cross-sectional structure of the electrode assembly shown.

[0040] The accompanying drawings in the specific implementation manner are as follows:

[0041] Vehicle 1000, battery device 100, housing 10, first part 11, second part 12, battery cell 20, end cap 21, electrode terminal 211, shell body 22, electrode assembly 23, tab 231, insulating layer 232, shell 24, insulating covering 25, plastic deformation shrinkage part 251, collecting plate 26, controller 200, motor 300. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 exists alone, 1 and 2 exist simultaneously, and 2 exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] Currently, in cylindrical battery cells, the tabs of the electrode assembly are usually insulated by providing insulating tape to reduce the risk of leakage caused by a short circuit between the tabs and the shell.

[0051] The insulating tape in the related technology is in the form of strips. When attached to the electrode assembly, it is first wrapped around the end of the electrode assembly at least once, and part of the insulating tape protrudes from the end face of the pole ear. Then, through a hot pressing process, the insulating tape protruding from the end face of the pole ear is pressed down and pasted to the end face of the pole ear. At this time, the insulating tape will have a lot of wrinkles.

[0052] After the insulating tape is applied, it will be introduced into the shell of the cylindrical battery cell together with the electrode assembly. However, during the period before entering the shell, the insulating tape will rebound and curl up, which not only affects the entry of the electrode assembly into the shell, but also makes the insulation between the tab and the shell ineffective.

[0053] To alleviate the problem of insulation failure between the tab and the housing due to the rebound and warping of the insulating tape, the present application designs a battery cell comprising a housing, an electrode assembly, and an insulating sheath. The electrode assembly is disposed within the housing, with the tab provided at the end of the electrode assembly. The insulating sheath comprises a plastically deformable and shrinkable portion and a main body connected to the plastically deformable and shrinkable portion. The plastically deformable and shrinkable portion is coated on the end face of the tab, and the main body is coated on at least the periphery of the electrode assembly. The periphery of the electrode assembly is also coated with an insulating layer, with the end of the main body away from the plastically deformable and shrinkable portion being coated on the periphery of the insulating layer.

[0054] In this way, when the electrode assembly's tab is covered by the insulating covering, the main body can at least cover the outer periphery of the electrode assembly to insulate at least the outer periphery of the tab of the electrode assembly from the shell, and the plastic deformation shrinkage component can cover the end face of the tab to insulate the end face of the tab from the shell. Since the plastic deformation is an irreversible deformation, the plastic deformation shrinkage component can achieve reliable shrinkage, reducing the rebound risk of the insulating covering on the end face of the tab, improving the reliability of the insulating covering in insulating the shell and the tab, and reducing the influence of the insulating covering on the electrode assembly entering the shell.

[0055] In addition, by wrapping the main part of the insulating covering on the outer periphery of the insulating layer, the insulating covering and the insulating layer can be connected as one, thereby providing insulation protection for the outer periphery of the entire electrode assembly and reducing the risk of short circuit between the electrode tab and the shell of the electrode assembly.

[0056] The battery cell of the present application is applied to a battery device to alleviate the problem of insulation failure between the tab and the shell caused by rebound and warping of the insulating tape.

[0057] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0058] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0061] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0062] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0063] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0064] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0065] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. Figure 4 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3 and Figure 4 As shown, the battery cell 20 includes an end cap 21 , a shell body 22 , an electrode assembly 23 and other functional components.

[0066] The end cap 21 is a component that covers the opening of the shell body 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the shell body 22 to match the shell body 22. Optionally, the end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 21 from deforming under pressure or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 211. The electrode terminals 211 can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in this embodiment of the present application. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0067] The shell body 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The shell body 22 and the end cap 21 can be separate components. An opening can be provided in the shell body 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the shell body 22 can be integrated. Specifically, the end cap 21 and the shell body 22 can form a common connection surface before other components are inserted into the shell. When the interior of the shell body 22 is to be enclosed, the end cap 21 is placed over the shell body 22. The shell body 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the shell body 22 can be determined based on the specific shape and size of the electrode assembly 23. The shell body 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this embodiment of the present application does not impose any particular limitations on this.

[0068] The electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The shell body 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly composed of positive and negative electrode materials, a separator, and a current collector. Specifically, the positive electrode material is coated on the battery output terminal connector to form a positive electrode sheet, and the negative electrode material is coated on the battery output terminal connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and the separator is arranged between the positive and negative electrode sheets to form the electrode assembly 23. The portions of the positive and negative electrode sheets containing active materials constitute the main body of the electrode assembly 23, and the portions of the positive and negative electrode sheets without active materials each constitute a tab 231. The positive and negative electrode tabs can be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs 231 connect to the electrode terminals 211 to form a current circuit.

[0069] See attached Figures 4 to 6 The embodiment of the present application provides a battery cell 20, comprising a housing 24, an electrode assembly 23, and an insulating sheath 25. The electrode assembly 23 is disposed within the housing 24. A tab 231 is provided at the end of the electrode assembly 23. The insulating sheath 25 comprises a plastically deformable and shrinkable portion 251 and a main body 252 connected to the plastically deformable and shrinkable portion 251. The plastically deformable and shrinkable portion 251 is coated on the end surface of the tab 231, and the main body 252 is coated on at least the periphery of the electrode assembly 23. The periphery of the electrode assembly 23 is further coated with an insulating layer 232, and the end of the main body 252 away from the plastically deformable and shrinkable portion 251 is coated on the periphery of the insulating layer 232.

[0070] The housing 24 includes the aforementioned housing body 22 and the end cover 21 .

[0071] The insulating covering 25 has insulating properties. It is a component that wraps a charged object with a non-conductive material (such as plastic, rubber, or ceramic) to prevent the flow of current. Its function is to prevent electric shock, short circuits, and energy loss. The insulating covering 25 is directly bonded to the component. Both the plastically deformable shrinkage portion 251 and the main body 252 of the insulating covering 25 have insulating properties.

[0072] The plastic deformation shrinkage portion 251 is a portion of the insulating covering 25, and refers to the portion that has achieved a shrinkage effect through plastic deformation to cover the component. It should be pointed out that plastic deformation is an irreversible deformation that occurs when a material exceeds its elastic limit. Specifically, plastic deformation can be achieved by heating the material at a high temperature, or by applying mechanical stress or an electric field to the material. Since the plastic deformation shrinkage portion 251 is coated on the end face of the tab 231, it can insulate the end face of the tab 231 from the shell 24.

[0073] It should also be noted that the plastically deformable shrinkage portion 251 does not cover the entire end surface of the tab 231, as the tab 231 needs to be electrically connected to an external device. In this embodiment of the present application, the tab 231 is electrically connected to the external device via the current collecting plate 26 described below. Therefore, the plastically deformable shrinkage portion 251 can be coated onto the outside of the current collecting plate 26, or directly onto the surface of the current collecting plate 26 facing away from the tab 231.

[0074] The main body 252 is the portion that primarily insulates the housing 24 from the tabs 231. The main body 252 covers at least the periphery of the electrode assembly 23 to insulate at least the periphery of the tabs 231 of the electrode assembly 23 from the housing 24. The main body 252 can be made of a mixture of one or more of polyamide, polyurethane, polyethylene, polypropylene, polyacrylic acid, polyvinyl alcohol, epoxy resin, organic silicone, and polyphenylene sulfide.

[0075] The insulating layer 232 is a film layer that wraps a charged body with a non-conductive material to prevent current from passing through. In the embodiment of the present application, the insulating layer 232 can be a blue film tape or a blue film attached to the outer periphery of the electrode assembly 23.

[0076] In the battery cell 20 of the embodiment of the present application, when the tab 231 of the electrode assembly 23 is covered by the insulating covering 25, the main body portion 252 can at least cover the outer periphery of the electrode assembly 23 to insulate at least the outer periphery of the tab 231 of the electrode assembly 23 from the shell 24, and the plastic deformation shrinkage portion 251 can cover the end face of the tab 231 to insulate the end face of the tab 231 from the shell 24. Since the deformation of plastic deformation is irreversible, the plastic deformation shrinkage portion 251 can achieve reliable shrinkage, reducing the rebound risk of the insulating covering 25 on the end face of the tab 231, improving the reliability of the insulating covering 25 in insulating the shell 24 and the tab 231, and reducing the influence of the insulating covering 25 on the insertion of the electrode assembly 23 into the shell.

[0077] In addition, by wrapping the main part 252 of the insulating covering 25 on the outer periphery of the insulating layer 232, the insulating covering 25 and the insulating layer 232 can be connected as one, thereby providing insulation protection for the outer periphery of the entire electrode assembly 23 and reducing the risk of short circuit between the electrode ear 231 and the shell 24 of the electrode assembly 23.

[0078] According to some embodiments of the present application, the plastic deformation shrinkage portion 251 is annular, and the main body portion 252 extends outward along the outer circumference of the plastic deformation shrinkage portion 251 .

[0079] Since the plastic deformation shrinkage portion 251 is the portion that has already shrunk through plastic deformation, and during the plastic deformation process, the material of the corresponding portion of the insulating sheath 25 may have slight dimensional differences, the plastic deformation shrinkage portion 251 is annular, which means that the plastic deformation shrinkage portion 251 is roughly annular, and can be a regular circular ring shape, square ring shape, etc., or an irregular circular ring shape, square ring shape, etc. The circular ring shape and square ring shape referred to here can be determined according to the specific shape of the battery cell 20. When the battery cell 20 is a cylindrical battery cell, the plastic deformation shrinkage portion 251 is annular, and when the battery cell 20 is a square battery cell, the plastic deformation shrinkage portion 251 is square ring shape.

[0080] The main body portion 252 extends from the outer periphery of the plastic deformation shrinkage portion 251 , that is, the outer ring edge of the plastic deformation shrinkage portion 251 .

[0081] By setting the plastic deformation shrinkage portion 251 to be annular, the plastic deformation shrinkage portion 251 can be shrunk as a whole toward the middle of the electrode assembly 23, thereby covering the end face of the pole ear 231 along the circumferential direction, further reducing the rebound risk of the insulating covering 25 on the end face of the pole ear 231, improving the reliability of the insulating covering 25 in insulating between the shell 24 and the pole ear 231, and reducing the influence of the insulating covering 25 on the electrode assembly 23 entering the shell.

[0082] In other embodiments, the plastic deformation shrinkage portion 251 may not be annular, for example, it may include multiple sub-plastic deformation shrinkage portions, all of which are arranged in annular intervals. Any two adjacent sub-plastic deformation shrinkage portions are connected by a portion of the main body portion 252.

[0083] According to some embodiments of the present application, the plastic deformation shrinkage portion 251 is configured as a thermoplastic deformation shrinkage portion.

[0084] Thermoplastic deformation shrinkage refers to the portion of the component that has shrunk due to thermoplastic deformation to envelop the component. Thermoplastic deformation is the plastic deformation of the material caused by heating, and is also irreversible.

[0085] The method of causing the material to undergo plastic deformation by heating the material is simple and reliable. In addition, it can also reduce the impact on the structure of the electrode assembly 23.

[0086] Optionally, the material of the plastic deformation shrinkage portion 251 can be polypropylene or polyethylene. It should be noted that the base material of the plastic deformation shrinkage portion 251 and the main body portion 252 can be the same, but the plastic deformation capability of the plastic deformation shrinkage portion 251 is better than that of the main body portion 252. Specifically, when the base materials of the plastic deformation shrinkage portion 251 and the main body portion 252 are both polypropylene, the thermoplastic deformation capability can be improved by adding a crosslinking agent, a nucleating agent, a plasticizer, etc. to the polypropylene material.

[0087] According to some embodiments of the present application, the main body portion 252 is coated on the end surface of the tab 231 and the outer periphery of the electrode assembly 23 .

[0088] By extending part of the main body 252 to the end face of the covering tab 231, the plastic deformation shrinkage part 251 can be brought closer to the center position of the electrode assembly 23, thereby reducing the inner circumference size of the plastic deformation shrinkage part 251 and further reducing the rebound risk of the insulating covering 25 on the end face of the tab 231.

[0089] According to some embodiments of the present application, the periphery of the electrode assembly 23 is further covered with an insulating layer 232 , and one end of the main body portion 252 away from the plastic deformation shrinkage portion 251 is covered on the periphery of the insulating layer 232 .

[0090] The insulating layer 232 is a film layer that wraps a charged body with a non-conductive material to prevent current from passing through. In the embodiment of the present application, the insulating layer 232 is a blue film tape or blue film attached to the outer periphery of the electrode assembly 23.

[0091] In this way, by wrapping the main part 252 of the insulating covering 25 on the outer periphery of the insulating layer 232, the insulating covering 25 and the insulating layer 232 can be connected as one, thereby providing insulation protection for the outer periphery of the entire electrode assembly 23 and reducing the risk of short circuit between the electrode ear 231 and the shell 24 of the electrode assembly 23.

[0092] According to some embodiments of the present application, the battery cell 20 further includes a current collecting plate 26 , which is connected to the end face of the tab 231 , and the plastically deformed shrinkage portion 251 is coated on the side surface of the current collecting plate 26 facing away from the tab 231 .

[0093] The collecting plate 26 acts as a bridge for current transmission, electrically connecting the electrode tabs to the end caps 21 and transmitting the electrical energy generated by the electrode assembly 23. The collecting plate 26 can be circular, rectangular, hexagonal, or other shapes suitable for the application scenario. In the embodiment of the present application, the battery cells 20 are cylindrical, so the collecting plate 26 is circular. The collecting plate 26 can be made of a material with good conductivity and a certain degree of structural strength, such as copper, aluminum, nickel-plated steel, or other metal materials. The collecting plate 26 can be connected to the electrode tabs 231 by welding.

[0094] Since the collecting plate 26 is connected to the end face of the pole ear 231, when the insulating covering 25 covers the end face of the pole ear 231, the plastic deformation shrinkage part 251 can be directly covered on the side surface of the collecting plate 26 facing away from the pole ear 231, so that the insulating covering 25 can be arranged around the outer periphery of the collecting plate 26, reducing the risk of short circuit between the collecting plate 26 and the pole ear 231 and the shell 24, and improving the insulation effect.

[0095] According to some embodiments of the present application, the main body portion 252 is coated on a surface of the current collecting plate 26 facing away from the tab 231 , an end surface of the tab 231 , and an outer periphery of the electrode assembly 23 .

[0096] That is to say, the projected boundary of the collecting plate 26 along the height direction of the electrode assembly 23 toward the electrode assembly 23 is on the inner side of the boundary of the pole ear 231 at the end of the electrode assembly 23, so that part of the end surface of the pole ear 231 is still exposed outside the collecting plate 26. Therefore, the main body 252 is used to cover the side surface of the collecting plate 26 facing away from the pole ear 231, the end surface of the pole ear 231 and the outer periphery of the electrode assembly 23, thereby reducing the risk of short circuit between the collecting plate 26 and the pole ear 231 and the shell 24, and improving the insulation effect.

[0097] According to some embodiments of the present application, a distance L1 between an outer edge of the plastically deformed contraction portion 251 and an outer edge of the collecting plate 26 is 10 mm to 20 mm.

[0098] Specifically, L1 can be obtained by measuring on any longitudinal section of the battery cell 20. The longitudinal section of the battery cell 20 refers to the section formed by cutting along the main axis or the longest direction of the battery cell 20. The main axis of the battery cell 20 is the central axis of the battery cell 20, and the longest direction of the battery cell 20 is also the height direction of the battery cell 20. The outer edge of the plastic deformation contraction portion 251 refers to the edge formed by the outer edge of the plastic deformation contraction portion 251 on the longitudinal section of the battery cell 20. The outer edge of the collecting plate 26 refers to the edge formed by the outer periphery of the collecting plate 26 on the longitudinal section of the battery cell 20.

[0099] When the distance L1 between the outer edge of the plastic deformation shrinkage part 251 and the outer edge of the collecting plate 26 is 10 mm to 20 mm, the plastic deformation shrinkage part 251 can be a certain distance away from the outer periphery of the collecting plate 26, reducing the risk of the plastic deformation shrinkage part 251 detaching from the outer periphery of the collecting plate 26, thereby improving the shrinkage reliability of the plastic deformation shrinkage part 251.

[0100] According to some embodiments of the present application, along the radial direction of the plastic deformation shrinkage portion 251 , the width L2 of the plastic deformation shrinkage portion 251 is not greater than 5 mm.

[0101] When the width L2 of the plastic deformation shrinkage portion 251 is too large, the plastic deformation shrinkage process is difficult to control, which reduces the shrinkage reliability of the plastic deformation shrinkage portion 251. Therefore, in the embodiment of the present application, by setting the width L2 of the plastic deformation shrinkage portion 251 to be no greater than 5 mm, the width of the plastic deformation shrinkage portion 251 is within an appropriate range, thereby improving the controllability of the plastic deformation shrinkage process and further improving the shrinkage reliability of the plastic deformation shrinkage portion 251.

[0102] According to some embodiments of the present application, the plastic deformation shrinkage portion 251 and the main body portion 252 are compositely connected.

[0103] Composite connection refers to a method in which two different components form a tight connection at the junction through physical or chemical means.

[0104] Since the plastic deformation shrinkage part 251 needs to be plastically deformed before being formed, while the main body part 252 does not need to be plastically deformed, the difficulty of the manufacturing process can be reduced when the material properties of the two are different. Further, the two can be connected in a composite manner, which can improve the connection reliability between the two and thereby improve the insulation reliability.

[0105] Optionally, the plastic deformation shrinkage portion 251 and the main body portion 252 are bonded or pressure bonded.

[0106] Adhesive bonding refers to the close connection between two parts through adhesive. Specifically, adhesive bonding can be applied between the two parts or adhesive tape can be used to perform composite connection.

[0107] Pressure composite connection refers to the tight connection between two parts through the action of pressure. Specifically, the composite connection between the two parts can be achieved by cold pressing or hot pressing.

[0108] The above-mentioned method of bonding and compounding the plastic deformation shrinkage part 251 and the main body part 252 is simple, and the connection is relatively reliable. It causes little structural damage to the plastic deformation shrinkage part 251 and the main body part 252, and makes the insulation reliability of the plastic deformation shrinkage part 251 and the main body part 252 high.

[0109] The above-mentioned pressure-compound connection between the plastic deformation shrinkage portion 251 and the main body portion 252 can cause plastic deformation and molecular diffusion at the interface between the two, forming a gapless physical connection, thereby improving insulation reliability.

[0110] According to some embodiments of the present application, referring to Figures 1 to 6 , provides a battery device 100, including the battery cell 20 in any of the above embodiments.

[0111] In the battery device 100 of the embodiment of the present application, when the tab 231 of the electrode assembly 23 is covered by the insulating covering 25, the main body portion 252 can at least cover the outer periphery of the electrode assembly 23 to insulate at least the outer periphery of the tab 231 of the electrode assembly 23 from the shell 24, and the plastic deformation shrinkage portion 251 can cover the end face of the tab 231 to insulate the end face of the tab 231 from the shell 24. Since the deformation of plastic deformation is irreversible, the plastic deformation shrinkage portion 251 can achieve reliable shrinkage, reducing the rebound risk of the insulating covering 25 on the end face of the tab 231, improving the reliability of the insulating covering 25 in insulating the shell 24 and the tab 231, and reducing the influence of the insulating covering 25 on the insertion of the electrode assembly 23 into the shell.

[0112] In addition, an embodiment of the present application further provides an electrical device, comprising the battery device 100 in any of the above embodiments.

[0113] In the electrical device of the embodiment of the present application, when the pole ear 231 of the electrode assembly 23 is covered by the insulating covering 25, the main body portion 252 can at least cover the outer periphery of the electrode assembly 23 to insulate at least the outer periphery of the pole ear 231 of the electrode assembly 23 from the shell 24, and the plastic deformation shrinkage portion 251 can cover the end face of the pole ear 231 to insulate the end face of the pole ear 231 from the shell 24. Since the deformation of plastic deformation is irreversible, the plastic deformation shrinkage portion 251 can achieve reliable shrinkage, reducing the rebound risk of the insulating covering 25 on the end face of the pole ear 231, improving the reliability of the insulating covering 25 in insulating the shell 24 and the pole ear 231, and reducing the influence of the insulating covering 25 on the insertion of the electrode assembly 23 into the shell.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: case; An electrode assembly is disposed in the housing, and an electrode tab is provided at an end of the electrode assembly; as well as An insulating covering comprises a plastic deformation shrinkage portion and a main body portion connected to the plastic deformation shrinkage portion; the plastic deformation shrinkage portion is covered on the end face of the electrode ear, and the main body portion is at least covered on the periphery of the electrode assembly; the periphery of the electrode assembly is also covered with an insulating layer, and one end of the main body portion away from the plastic deformation shrinkage portion is covered on the periphery of the insulating layer.

2. The battery cell according to claim 1, wherein: The plastic deformation shrinkage portion is annular, and the main body portion extends outward along the outer circumference of the plastic deformation shrinkage portion.

3. The battery cell according to claim 1, wherein: The plastic deformation shrinkage portion is configured to shrink due to thermoplastic deformation.

4. The battery cell according to claim 1, wherein: The main body is covered on the end surface of the tab and the outer periphery of the electrode assembly.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The battery cell further includes a current collecting plate connected to the end surface of the pole lug, and the plastically deformed and shrunk portion is coated on a surface of the current collecting plate facing away from the pole lug.

6. The battery cell according to claim 5, characterized in that The main body is covered on a surface of the current collecting plate facing away from the electrode tab, an end surface of the electrode tab and an outer periphery of the electrode assembly.

7. The battery cell according to claim 6, characterized in that The distance between the outer edge of the plastically deformed shrinkage portion and the outer edge of the collecting plate is 10 mm to 20 mm.

8. The battery cell according to any one of claims 1 to 4, characterized in that: Along the radial direction of the plastic deformation shrinkage portion, the width of the plastic deformation shrinkage portion is no more than 5 mm.

9. The battery cell according to any one of claims 1 to 4, characterized in that: The plastic deformation shrinkage portion and the main body portion are compositely connected.

10. The battery cell according to claim 9, characterized in that The plastic deformation shrinkage portion and the main body portion are bonded or pressure bonded.

11. A battery device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery device as claimed in claim 11.

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