Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. Each battery monomer comprises a shell, an electrode assembly, an insulating sheet and an insulating bulge, the electrode assembly is arranged in the shell, the insulating sheet wraps the electrode assembly, a gap is formed between the insulating sheet and the inner wall surface of the shell, and the insulating bulge is arranged in the gap. Therefore, the insulating bulges can play a supporting role between the insulating sheet and the inner wall surface of the shell, the shaking amplitude of the electrode assembly in the gap is reduced, and the risk of tab cracking of the electrode assembly is reduced, so that the service life of the single battery is prolonged.

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] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles. Typically, a battery cell consists of an electrode assembly and a casing. To improve the wettability of the electrode assembly within the casing, a gap is created between the electrode assembly and the casing. However, this gap can easily cause the electrode assembly to wobble within the casing, potentially leading to adverse effects such as cracking of the electrode tabs. Utility Model Content

[0003] In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment, which can reduce the risk of cracking of the tabs of the electrode assembly.

[0004] In the first aspect, the present application provides a battery cell, which includes a shell, an electrode assembly, an insulating sheet and an insulating protrusion. The electrode assembly is arranged in the shell, the insulating sheet wraps the electrode assembly, a gap is formed between the insulating sheet and the inner wall surface of the shell, and the insulating protrusion is arranged in the gap.

[0005] In this way, the insulating protrusion can play a supporting role between the insulating sheet and the inner wall surface of the shell, reduce the shaking amplitude of the electrode assembly in the gap, reduce the risk of cracking of the electrode tab of the electrode assembly, and thus extend the service life of the battery cell.

[0006] In certain embodiments, the insulating protrusion is provided on a surface of the insulating sheet facing the housing.

[0007] In certain embodiments, along a direction from the insulating sheet toward the housing, a size of the insulating protrusion is 0.1% to 2% of a group margin of the battery cell.

[0008] In some embodiments, the shell includes two first walls and two second walls, the second walls are connected to the first walls, the two first walls are arranged along a first direction, the two second walls are arranged along a second direction, the first direction is perpendicular to the second direction, and the insulating protrusion is arranged in the gap between the inner wall surface of the first wall and the insulating sheet.

[0009] In certain embodiments, the area of ​​the first wall is greater than the area of ​​the second wall.

[0010] In some embodiments, there are multiple insulating protrusions, and the multiple insulating protrusions are arranged at intervals along the second direction.

[0011] In certain embodiments, along the third direction, a size of the insulating protrusion is greater than half a size of the electrode assembly, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0012] In some embodiments, there are multiple insulating protrusions, and the multiple insulating protrusions are arranged at intervals along the second direction and the third direction.

[0013] In some embodiments, the insulating protrusions arranged along the second direction are first protrusions, the insulating protrusions along the third direction are second protrusions, and the projection of the first protrusion along the second direction covers the gap between two adjacent second protrusions.

[0014] In some embodiments, the insulating sheet is formed with a liquid inlet hole, and at least part of the liquid inlet hole is arranged between two adjacent insulating protrusions.

[0015] In a second aspect, the present application provides a battery device comprising the battery cell in any of the above embodiments.

[0016] In a third aspect, the present application provides an electrical device, which includes a battery cell or a battery device in any of the above embodiments, and the battery cell or the battery device is used to provide electrical energy.

[0017] 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

[0018] 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:

[0019] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0020] Figure 2 Schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0021] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0022] Figure 4 This is a schematic structural diagram of a battery cell in some embodiments of the present application;

[0023] Figure 5This is a schematic structural diagram of the insulating protrusion in some embodiments of the present application;

[0024] Figure 6 Schematic diagrams of the structures of insulating protrusions in other embodiments of the present application;

[0025] Figure 7 This is a schematic structural diagram of the liquid inlet hole in some embodiments of the present application;

[0026] Figure 8 Schematic diagram of the structure of the liquid inlet hole in other embodiments of the present application.

[0027] Explanation of the accompanying drawings: 1000, vehicle; 100, battery; 200, controller; 300, motor; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, outer shell; 211, cavity; 212, first wall; 213, second wall; 22, electrode assembly; 23, insulating sheet; 231, liquid inlet hole; 24, insulating protrusion; 241, first protrusion; 242, second protrusion. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0033] 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).

[0034] 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.

[0035] 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.

[0036] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0037] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0038] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. Batteries generally include a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0039] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet and a separator.

[0040] Battery cells primarily operate by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector not coated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector not coated with the positive active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector not coated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector not coated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together, and the negative electrode tabs are multiple and stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene).

[0041] The battery cell also includes a housing and a top cover. The housing protects the electrode assembly from the outside to reduce the impact of external foreign matter on the electrode assembly's charging or discharging. The top cover and the housing together define a housing for the electrode assembly, electrolyte, and other components.

[0042] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the battery life must also be considered.

[0043] In the prior art, in order to improve the wetting effect of the electrode assembly in the shell, a gap is formed between the electrode assembly and the shell. However, these gaps can easily cause the electrode assembly to shake in the shell, which can easily lead to adverse effects such as cracking of the electrode tab.

[0044] In order to reduce the risk of cracking of the tab of the electrode assembly, the present application provides an insulating protrusion for a battery cell. The insulating protrusion is arranged in the gap formed between the insulating sheet and the inner wall surface of the outer shell. The insulating protrusion can play a supporting role between the insulating sheet and the inner wall surface of the outer shell, reduce the shaking amplitude of the electrode assembly in the gap, reduce the risk of cracking of the tab of the electrode assembly, and thus extend the service life of the battery cell.

[0045] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical equipment.

[0046] The present invention provides an electrical device that uses a battery cell as a power source. The electrical device may include, 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, and the like. 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, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0047] 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.

[0048] Please refer to Figure 1 , Figure 1 A 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.

[0049] 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 .

[0050] In some embodiments, the battery device 100 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0051] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the exploded structure 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 space for the battery cell 20 and can adopt various structures.

[0052] In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which cover each other and together define a storage space for accommodating the battery cells 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, with the first portion 11 covering 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 may also be hollow structures with one end open, with the open side of the first portion 11 covering 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.

[0053] 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.

[0054] 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.

[0055] According to some embodiments of this application, please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the exploded structure of a battery cell 20 according to some embodiments of the present application; Figure 4Schematic diagram of the structure of a battery cell 20 according to some embodiments of the present application. The battery cell 20 according to the embodiment of the present application includes a housing 21, an electrode assembly 22, an insulating sheet 23, and an insulating protrusion 24. The electrode assembly 22 is disposed in the housing 21. The insulating sheet 23 wraps around the electrode assembly 22. A gap is formed between the insulating sheet 23 and the inner wall of the housing 21. The insulating protrusion 24 is disposed in the gap.

[0056] Specifically, the housing 21 is a hollow structure, forming a cavity 211 with an open top. The cavity 211 is used to accommodate the electrode assembly 22 and the electrolyte. The housing 21 can be of various shapes, such as a cylinder, a rectangular parallelepiped, etc. The shape of the housing 21 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 21 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 21 can be selected.

[0057] The electrode assembly 22 is the core component that enables the charge and discharge functions of the battery cell 20. The housing 21 may contain one or more electrode assemblies 22. The electrode assembly 22 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive and negative electrode sheets have opposite polarities, and the separator is used to insulate the positive and negative electrode sheets. The electrode assembly 22 primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0058] The electrode assembly 22 is placed in the cavity 211 of the shell 21, and the insulating sheet 23 is coated on the surface of the electrode assembly 22 to isolate the electrode assembly 22 from the inner wall of the cavity 211 of the shell 21, ensure insulation between the electrode assembly 22 and the shell 21, and reduce the risk of short circuit. The surface of the electrode assembly 22 may include a top surface facing the top opening of the shell cavity 211, a bottom surface opposite to the top surface, and a side surface located between the top surface and the bottom surface, and the shape formed by the top surface, bottom surface and side surface of the electrode assembly 22 is roughly rectangular, and the insulating sheet 23 covers the bottom surface and side surface of the electrode assembly 22. The insulating sheet 23 can be made of plastic or rubber and has good insulating properties. In one embodiment, the insulating sheet 23 is a polyester film, which has good heat resistance, surface smoothness, transparency and mechanical flexibility.

[0059] The insulating protrusion 24 can be in the shape of an elongated strip, and the cross-section of the insulating protrusion 24 can be square, trapezoidal, arc-shaped, etc. The insulating protrusion 24 can be provided on the insulating sheet 23 or on the inner wall surface of the housing 21. The insulating protrusion 24 can be provided between the insulating sheet 23 and one inner wall surface of the housing 21, or between the insulating sheet 23 and multiple inner wall surfaces of the housing 21.

[0060] In this way, the insulating protrusion 24 can play a supporting role between the insulating sheet 23 and the inner wall surface of the shell 21, reduce the shaking amplitude of the electrode assembly 22 in the gap, and reduce the risk of cracking of the tab of the electrode assembly 22, thereby extending the service life of the battery cell 20.

[0061] Please refer to Figure 4 In some embodiments, the insulating protrusion 24 is provided on the surface of the insulating sheet 23 facing the housing 21 .

[0062] Specifically, the insulating protrusion 24 can be integrally formed with the insulating sheet 23 or secured by adhesive. The material of the insulating protrusion 24 can be the same as or different from that of the insulating sheet 23. When the insulating protrusion 24 is disposed on the insulating sheet 23, the insulating protrusion 24 can abut against the inner wall of the housing 21 or be spaced a certain distance from the inner wall.

[0063] The insulating protrusion 24 is disposed on the surface of the insulating sheet 23 facing the housing 21 , which is more convenient for disposing the insulating protrusion 24 on the battery cell 20 and assembling the battery cell 20 than disposing the insulating protrusion 24 on the surface of the housing 21 facing the insulating sheet 23 .

[0064] Please refer to Figure 3 In some embodiments, the housing 21 includes two first walls 212 and two second walls 213, the second walls 213 connect the first walls 212, the two first walls 212 are arranged along a first direction X, and the two second walls 213 are arranged along a second direction Y, the first direction X is perpendicular to the second direction Y, and the insulating protrusion 24 is arranged in the gap between the inner wall surface of the first wall 212 and the insulating sheet 23.

[0065] The first wall 212 and the second wall 213 may be side walls of the housing 21. When the housing 21 is a rectangular parallelepiped, the first wall 212 and the second wall 213 are arranged perpendicularly to form a space for accommodating the electrode assembly 22 and the electrolyte. The first direction X may be the width direction of the housing 21, and the second direction Y may be the length direction of the housing 21. The first wall 212 and the second wall 213 may be integrally formed or connected by welding.

[0066] The first wall 212 and the second wall 213 can be made of a material with a certain degree of hardness and strength, such as copper, iron, aluminum, stainless steel, or an aluminum alloy. This prevents the first wall 212 and the second wall 213 from deforming when subjected to compression or collision, thereby increasing the structural strength of the battery cell 20 and improving safety. The material of the first wall 212 and the second wall 213 can be the same or different.

[0067] The insulating protrusion 24 can be disposed between the insulating sheet 23 and the inner wall surface of one of the first walls 212, or between the insulating sheet 23 and the inner wall surfaces of both first walls 212. The insulating protrusion 24 can be disposed on the surface of the insulating sheet 23 facing the first wall 212, or on the inner wall surface of the first wall 212 facing the insulating sheet 23.

[0068] The insulating protrusion 24 is arranged between the insulating sheet 23 and the inner wall surface of the first wall 212, so that the insulating protrusion 24 can play a supporting role between the insulating sheet 23 and the inner wall surface of the first wall 212, and can effectively reduce the impact on the electrical performance of the battery cell 20 and reduce the impact on the volume energy density of the battery cell 20.

[0069] Please refer to Figure 3 In some embodiments, the area of ​​the first wall 212 is greater than the area of ​​the second wall 213 .

[0070] Specifically, the first wall 212 and the second wall 213 can be rectangular plate structures, with the two first walls 212 disposed opposite each other and the two second walls 213 disposed opposite each other. When the first wall 212 and the second wall 213 have the same length, the width of the first wall 212 can be greater than the width of the second wall 213.

[0071] In this way, the insulating protrusion 24 is arranged between the insulating sheet 23 and the inner wall surface of the first wall 212. Compared with being arranged between the insulating sheet 23 and the inner wall surface of the second wall 213, the thickness of the insulating protrusion 24 can be reduced, while increasing the binding force of the insulating sheet 23 on the electrode assembly 22, thereby reducing the risk of the tab cracking.

[0072] Please refer to Figure 5 , Figure 5 Schematic diagram of the structure of the insulating protrusion 24 of some embodiments of the present application. In some embodiments, there are multiple insulating protrusions 24, and the multiple insulating protrusions 24 are arranged at intervals along the second direction Y.

[0073] Specifically, the number of the insulating protrusions 24 may be three, four, five, six, etc., and along the second direction Y, the intervals between two adjacent insulating protrusions 24 may be equal or unequal.

[0074] In this way, the multiple insulating protrusions 24 can play multiple supporting roles between the insulating sheet 23 and the inner wall surface of the shell 21, thereby improving the stability of the electrode assembly 22 in the shell 21 and effectively reducing the shaking amplitude of the electrode assembly 22 in the gap.

[0075] Please refer to Figure 3 and Figure 5In some embodiments, along the third direction Z, the size of the insulating protrusion 24 is greater than half the size of the electrode assembly 22, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0076] Specifically, the third direction Z can be the height direction of the housing 21, and the insulating protrusion 24 extends along the third direction Z. The size of the insulating protrusion 24 is greater than half the size of the electrode assembly 22, and the length of the insulating protrusion 24 in the third direction Z can be greater than half the height of the electrode assembly 22. For example, the length of the insulating protrusion 24 in the third direction Z can be 2 / 3, 3 / 4, 3 / 5, 4 / 5, 1, etc., of the height of the electrode assembly 22. The sizes of the multiple insulating protrusions 24 can be equal or different.

[0077] In this way, increasing the size of the insulating protrusion 24 can increase the supporting area of ​​the insulating protrusion 24 between the insulating sheet 23 and the shell 21, thereby improving the stability of the electrode assembly 22 in the shell 21 and effectively reducing the shaking amplitude of the electrode assembly 22 in the gap.

[0078] Please refer to Figure 6 , Figure 6 Schematic diagram of the structure of the insulating protrusion 24 of some embodiments of the present application. In some embodiments, there are multiple insulating protrusions 24, and multiple insulating protrusions 24 are arranged at intervals along the second direction Y and the third direction Z.

[0079] Specifically, some of the insulating protrusions 24 may be arranged at intervals along the second direction Y, while another portion of the insulating protrusions 24 may be arranged at intervals along the third direction Z. Alternatively, multiple insulating protrusions 24 may be arranged at intervals along both the second direction Y and the third direction Z. For example, the number of insulating protrusions 24 may be twelve, and the twelve insulating protrusions 24 may be arranged at intervals in a rectangular shape, with four insulating protrusions 24 arranged at intervals along the second direction Y and three insulating protrusions 24 arranged at intervals along the third direction Z.

[0080] When the plurality of insulating protrusions 24 are arranged at intervals along the third direction Z, the size of the insulating protrusions 24 can be less than half the size of the electrode assembly 22, that is, the length of the insulating protrusions 24 in the third direction Z is less than half the height of the electrode assembly 22. For example, the length of the insulating protrusions 24 in the third direction Z can be 1 / 3, 1 / 4, 1 / 5, 2 / 5, etc., of the height of the electrode assembly 22.

[0081] In this way, the electrolyte can be easily transferred between the multiple insulating protrusions 24, and the insulating protrusions 24 can be prevented from blocking the electrolyte.

[0082] Please refer to Figure 6In some embodiments, the insulating protrusions 24 arranged along the second direction Y are first protrusions 241, and the insulating protrusions 24 arranged along the third direction Z are second protrusions 242. The projection of the first protrusion 241 along the second direction Y covers the gap between two adjacent second protrusions 242.

[0083] Specifically, the length of the first protrusion 241 in the third direction Z may be greater than or equal to the distance between two adjacent second protrusions 242 arranged along the third direction Z.

[0084] In one embodiment, there are two first protrusions 241 and two second protrusions 242 , the two first protrusions 241 are spaced apart along the second direction Y, the two second protrusions 242 are disposed between the two first protrusions 241 , and the two second protrusions 242 are spaced apart along the third direction Z.

[0085] In another embodiment, there are three first protrusions 241 and six second protrusions 242 . The three first protrusions 241 are spaced apart along the second direction Y, and every three second protrusions 242 are disposed between two adjacent first protrusions 241 and spaced apart along the third direction Z.

[0086] Please refer to Figure 7 and Figure 8 , Figure 7 and Figure 8 Schematic diagram of the structure of the liquid inlet hole 231 in some embodiments of the present application. In some embodiments, the insulating sheet 23 is formed with the liquid inlet hole 231 , and at least part of the liquid inlet hole 231 is disposed between two adjacent insulating protrusions 24 .

[0087] Specifically, the liquid inlet hole 231 can be a through hole that penetrates the insulating sheet 23 along the thickness direction of the insulating sheet 23. The liquid inlet hole 231 can be a circular hole, a square hole, or a polygonal hole. There can be multiple liquid inlet holes 231, for example, there can be two, three, four, five, or six liquid inlet holes 231 between two adjacent insulating protrusions 24. All liquid inlet holes 231 can be located between two adjacent insulating protrusions 24, or a portion of the liquid inlet holes 231 can be located between two adjacent insulating protrusions 24, while another portion of the liquid inlet holes 231 can be located on the side of the first and last insulating protrusions 24 arranged along the second direction Y, facing away from the other insulating protrusions 24.

[0088] The liquid inlet holes 231 may be arranged at intervals along the second direction Y, along the third direction Z, or along both the second direction Y and the third direction Z. The number, aperture size, and position arrangement of the liquid inlet holes 231 may be designed according to actual needs.

[0089] In one embodiment, three insulating protrusions 24 are arranged at intervals along the second direction Y, and three liquid inlet holes 231 are formed on both sides of each insulating protrusion 24. In another embodiment, two insulating protrusions 24 are arranged at intervals along both the second direction Y and the third direction Z, and six liquid inlet holes 231 are formed between each first protrusion 241 and two second protrusions 242.

[0090] In this way, the electrolyte can enter the electrode assembly 22 through the liquid inlet hole 231, shortening the path for the electrolyte to enter the electrode assembly 22, thereby improving the wetting effect of the electrode assembly 22 in the shell 21.

[0091] In some embodiments, along the direction from the insulating sheet 23 toward the housing 21 , the size of the insulating protrusion 24 is 0.1% to 2% of the group margin of the battery cell 20 .

[0092] Specifically, the dimension of the insulating protrusion 24 along the direction from the insulating sheet 23 toward the outer shell 21 may be the thickness of the insulating protrusion 24 , that is, the dimension of the insulating protrusion 24 in the first direction X. The group margin of the battery cell 20 is the ratio of the thickness of the electrode assembly 22 to the thickness of the cavity 211 of the outer shell 21 , that is, the ratio of the dimension of the electrode assembly 22 in the first direction X to the dimension of the cavity 211 of the outer shell 21 in the first direction X.

[0093] When the group margin of the battery cell 20 is too low, the insulating protrusion 24 of the battery cell 20 cannot fit tightly with the outer shell 21 during the formation process, and there is a lack of external stress restraint, which leads to the inability to form a dense SEI film on the surface of the active material, and easily causes the electrode sheets and diaphragms to wrinkle during formation, increasing the proportion of defective products and bringing higher safety risks; when the group margin of the battery cell 20 is too high, it will cause difficulty in inserting the electrode assembly 22 into the shell during production, and excessive expansion of the electrode sheets during charging and discharging will affect the structure of the outer shell 21 or product performance.

[0094] In one embodiment, the group margin of the battery cell 20 is 90%, and the thickness of the insulating protrusion 24 is 0.0009 mm to 0.018 mm. The thicker the insulating protrusion 24 is, the more electrolyte can be injected into the battery cell 20.

[0095] The thickness and number of the insulating protrusions 24 can be adjusted according to the internal space required by different battery cells 20, so that more electrolyte can be injected into the battery cells 20 without the risk of the tabs of the battery cells 20 cracking due to low group margin of the battery cells 20.

[0096] Please refer to Figure 2 The battery device 100 according to the embodiment of the present application includes a battery cell 20 .

[0097] The battery device 100 includes one or more battery cells 20 , and the battery device 100 may include a battery module or a battery pack.

[0098] The electric device according to the embodiment of the present application includes a battery cell 20 or a battery device 100. The battery cell 20 or the battery device 100 is used to provide electric energy to the electric device.

[0099] 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: shell; an electrode assembly disposed in the housing; an insulating sheet, the insulating sheet wrapping the electrode assembly, with a gap formed between the insulating sheet and the inner wall surface of the shell; and, The insulating protrusion is arranged in the gap.

2. The battery cell according to claim 1, wherein: The insulating protrusion is provided on a surface of the insulating sheet facing the housing.

3. The battery cell according to claim 2, characterized in that: Along a direction from the insulating sheet toward the housing, a size of the insulating protrusion is 0.1% to 2% of a group margin of the battery cells.

4. The battery cell according to claim 1, wherein: The shell includes two first walls and two second walls, the second walls are connected to the first walls, the two first walls are arranged along a first direction, the two second walls are arranged along a second direction, the first direction is perpendicular to the second direction, and the insulating protrusion is arranged in the gap between the inner wall surface of the first wall and the insulating sheet.

5. The battery cell according to claim 4, characterized in that An area of ​​the first wall is greater than an area of ​​the second wall.

6. The battery cell according to claim 4, characterized in that There are multiple insulating protrusions, and the multiple insulating protrusions are arranged at intervals along the second direction.

7. The battery cell according to claim 6, characterized in that Along the third direction, the size of the insulating protrusion is greater than half the size of the electrode assembly, and the first direction, the second direction and the third direction are perpendicular to each other.

8. The battery cell according to claim 4, characterized in that There are multiple insulating protrusions, and the multiple insulating protrusions are arranged at intervals along the second direction and the third direction.

9. The battery cell according to claim 8, characterized in that The insulating protrusions arranged along the second direction are first protrusions, and the insulating protrusions arranged along the third direction are second protrusions. The projection of the first protrusion along the second direction covers the gap between two adjacent second protrusions.

10. The battery cell according to claim 1, characterized in that The insulating sheet is formed with a liquid inlet hole, and at least part of the liquid inlet hole is arranged between two adjacent insulating protrusions.

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

12. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 10 or the battery device according to claim 11.

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