Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device. The battery cell comprises an electrode assembly and an insulating member. The insulating member comprises a first insulating portion and a second insulating portion, which are connected to each other, wherein the first insulating portion covers a first end face of the electrode assembly; the second insulating portion covers a peripheral surface of the electrode assembly; the first insulating portion has a first surface facing away from the first end face and a second surface facing the first end face; and the first surface and / or the second surface is / are provided with protrusions. The energy density by weight of a battery can be improved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, how to improve the energy density of batteries is a technical problem that needs to be solved urgently.

[0004] Summary of the Invention

[0005] The present application provides a battery cell, a battery and an electrical device. The technical solution provided in the present application can improve the weight energy density of the battery.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell comprising an electrode assembly and an insulating member. The insulating member comprises a first insulating portion and a second insulating portion connected to each other, the first insulating portion covering a first end surface of the electrode assembly, and the second insulating portion covering an outer peripheral surface of the electrode assembly. The first insulating portion has a first surface facing away from the first end surface and a second surface facing the first end surface, and the first surface and / or the second surface are provided with protrusions.

[0008] In the above solution, by providing protrusions on the first and / or second surfaces, they can replace the existing base plate of the battery cell, providing support for the electrode assembly. The protrusions elevate the electrode assembly, reducing the risk of interference between the fillet between the first end wall and the side wall of the housing and the electrode assembly, which could damage the electrode assembly. Since the protrusions replace the base plate, they can save weight from the base plate itself, effectively reducing the weight of the battery cell and thereby increasing the battery's weight energy density.

[0009] According to some embodiments of the present application, the first surface is provided with a protrusion, and the second surface is provided with a groove at a position corresponding to the protrusion. Alternatively, the second surface is provided with a protrusion, and the first surface is provided with a groove at a position corresponding to the protrusion.

[0010] In the above solution, by providing a groove on the other side of the first insulating part corresponding to the protrusion, compared with the solution of directly providing the protrusion on the first insulating part, the weight increase caused by providing the protrusion can be effectively reduced, so that the battery has a higher weight energy density.

[0011] According to some embodiments of the present application, a reinforcement member is provided in the groove.

[0012] In the above scheme, by arranging a reinforcement member in the groove, the structural strength of the first insulating part can be improved, the supporting effect of the protrusion on the electrode assembly can be improved, and the risk of the protrusion collapsing due to the weight of the electrode assembly can be reduced, thereby effectively replacing the bottom support plate, so that the battery has higher reliability while having a higher weight energy density.

[0013] According to some embodiments of the present application, the reinforcement member includes a filler disposed in the groove.

[0014] In the above solution, by placing a filler inside the groove, the structural strength of the first insulating portion can be enhanced, the support provided by the protrusion to the electrode assembly can be improved, and the risk of the protrusion collapsing due to the weight of the electrode assembly can be reduced, thereby improving the battery's reliability. In some embodiments, the filler can be a porous structure, such as sponge. Placing a sponge inside the groove not only improves the support provided by the protrusion to the electrode assembly, but also allows for the infiltration of more electrolyte, thereby improving the battery's charge and discharge performance.

[0015] According to some embodiments of the present application, the reinforcement member includes a coating applied to the inner surface of the groove.

[0016] In the above scheme, by providing a coating on the inner surface of the groove, the anti-collapse ability of the protrusion can be improved, so that the protrusion can effectively support the electrode assembly, thereby effectively replacing the bottom plate, so that the battery has higher reliability while having a higher weight energy density.

[0017] According to some embodiments of the present application, there are multiple protrusions, and the multiple protrusions are arranged at intervals.

[0018] In the above solution, by providing multiple protrusions to jointly support the electrode assembly, the risk of interference between the electrode assembly and the outer shell can be effectively reduced, that is, the protrusions can effectively replace the bottom plate, so that the battery has higher reliability while having a higher weight energy density.

[0019] According to some embodiments of the present application, the protrusion is a circular protrusion, an elliptical protrusion, or a long strip protrusion.

[0020] In the above solution, the shape of the protrusion can be diversified to reduce the difficulty of protrusion processing and improve the manufacturing efficiency of the battery.

[0021] According to some embodiments of the present application, the protrusion is a long strip-shaped protrusion, the length direction of the protrusion is parallel to the width direction of the first end surface, and the width direction of the protrusion is parallel to the length direction of the first end surface.

[0022] In the above solution, by limiting the protrusion to a long strip protrusion and limiting the length direction of the protrusion to be parallel to the width direction of the first end face, the protrusion can effectively support the electrode assembly, so that the battery has higher reliability while having a higher weight energy density.

[0023] According to some embodiments of the present application, a plurality of protrusions are arranged at intervals along the length direction of the first end surface.

[0024] In the above solution, by limiting the plurality of protrusions to be spaced apart along the length direction of the first end face, the plurality of long strip protrusions can jointly and effectively support the electrode assembly, so that the battery has higher reliability while having a higher weight energy density.

[0025] According to some embodiments of the present application, the maximum length of the first end surface is L1, and the minimum distance between two adjacent protrusions is L2, satisfying L1 / 100≤L2≤L1 / 2.

[0026] In the above scheme, the minimum spacing L2 between two adjacent protrusions is limited by the maximum length L1 of the first end face, so that L1 and L2 satisfy L1 / 100≤L2≤L1 / 2, which enables multiple protrusions to effectively support the electrode assembly, so that the battery has higher reliability under the condition of higher weight energy density.

[0027] According to some embodiments of the present application, the battery cell also includes a shell, and the electrode assembly is arranged in the shell; the size of the protrusion in a direction perpendicular to the first end face is h; the shell includes a first end wall and a side wall, the first end face is arranged opposite to the first end wall, the side wall is arranged around the edge of the first end wall, and the inner surface of the side wall is connected to the inner surface of the first end wall by a rounded transition, the radius of the rounded corner is R, and satisfies R / 10≤h≤2R.

[0028] In the above scheme, the dimension h of the protrusion in the direction perpendicular to the first end face can be regarded as the dimension of the electrode assembly lifted by the protrusion. By limiting the dimension h of the protrusion in the direction perpendicular to the first end face and the radius R of the fillet between the inner surface of the side wall and the inner surface of the first end wall to satisfy R / 10≤h≤2R, the protrusion can effectively replace the lifting effect of the bottom support plate on the electrode assembly, so as to reduce the risk of interference between the electrode assembly and the outer shell of the battery cell, causing damage to the electrode assembly, and make the battery have higher reliability.

[0029] According to some embodiments of the present application, 3R / 10≤h≤R is satisfied.

[0030] In the above scheme, by limiting h to 3R / 10≤h≤R, the electrode assembly can be effectively raised to reduce the risk of interference between the electrode assembly and the outer shell of the battery cell, thereby damaging the electrode assembly. At the same time, it also reduces the risk of the volume energy density being affected due to the protrusion occupying too much space.

[0031] According to some embodiments of the present application, the dimension of the protrusion in a direction perpendicular to the first end face is h, the thickness of the first insulating portion is t, the tensile strength of the first insulating portion is σ, and the dimension of the electrode assembly in a direction perpendicular to the first end face is H, satisfying 1≤H / (σ*t / h)≤10.

[0032] In the above scheme, the dimension H of the electrode assembly in the direction perpendicular to the first end face, the dimension h of the protrusion in the direction perpendicular to the first end face, the thickness t of the first insulating part and the tensile strength σ can be limited by 1≤H / (σ*t / h)≤10, so that the protrusion can effectively support and lift the electrode assembly, thereby effectively replacing the bottom plate, so that the battery has higher reliability while having higher weight energy density.

[0033] According to some embodiments of the present application, 3≤H / (σ*t / h)≤8 is satisfied.

[0034] In the above scheme, the limitation of 3≤H / (σ*t / h)≤8 can further enable the protrusion to effectively support and lift the electrode assembly, thereby effectively replacing the bottom plate, so that the battery has higher reliability while having higher weight energy density.

[0035] According to some embodiments of the present application, the first insulating portion is provided with a through hole, and along a thickness direction of the first insulating portion, a projection of the through hole does not overlap with a projection of the protrusion.

[0036] In the above solution, by providing a through hole on the first insulating part, on the one hand, the through hole can be used to realize the loading and positioning of the insulating part, and on the other hand, the electrolyte can be infiltrated into the electrode assembly through the through hole, thereby improving the infiltration effect of the electrolyte.

[0037] According to some embodiments of the present application, a through hole is provided at an end of the first insulating portion along a length direction of the first insulating portion; and / or a through hole is provided at an end of the first insulating portion along a width direction of the first insulating portion.

[0038] In the above scheme, by arranging through holes at the ends in the length direction and / or the width direction of the first insulating part, on the one hand, it is beneficial to the loading and positioning of the insulating part, and on the other hand, it is beneficial to the wetting effect of the electrolyte; on the other hand, compared with the through holes arranged in the middle of the first insulating part, the through holes arranged at the ends of the first insulating part can reduce the impact of the structural strength of the first insulating part caused by the arrangement of the through holes, and improve the supporting effect of the first insulating part on the electrode assembly, thereby effectively replacing the bottom plate, so that the battery has higher reliability under the condition of higher weight energy density.

[0039] According to some embodiments of the present application, there are multiple through holes, and the protrusion is provided between two adjacent through holes.

[0040] In the above scheme, on the one hand, multiple through holes are provided, which can be beneficial to the infiltration effect of the electrolyte and the loading and positioning of the insulating parts; on the other hand, a protrusion is provided between two adjacent protrusions, which can compensate for the loss of structural strength of the first insulating part caused by the provision of the through hole, and improve the supporting effect of the first insulating part on the electrode assembly, thereby effectively replacing the bottom plate, so that the battery has higher reliability under the condition of higher weight energy density.

[0041] In a second aspect, some embodiments of the present application further provide a battery, comprising the battery cell of any one of the first aspects.

[0042] In a third aspect, some embodiments of the present application further provide an electrical device comprising the battery cell of any one of the first aspects, wherein the battery cell is used to provide electrical energy.

[0043] 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

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0045] FIG1 is a schematic structural diagram of a vehicle in some embodiments of the present application;

[0046] FIG2 is an exploded perspective view of a battery in some embodiments of the present application;

[0047] FIG3 is an exploded perspective view of a battery cell in some embodiments of the present application;

[0048] FIG4 is a partial schematic diagram of the internal structure of a battery cell in some embodiments of the present application;

[0049] FIG5 is a schematic diagram of a partial structure of a housing in some embodiments of the present application;

[0050] FIG6 is a schematic diagram of a first insulating portion and an electrode assembly in some embodiments of the present application;

[0051] FIG7 is a schematic diagram of a first insulating portion, an electrode assembly, and a reinforcement member in some other embodiments of the present application;

[0052] FIG8 is a schematic diagram of an insulating member in some embodiments of the present application;

[0053] FIG9 is a schematic diagram of an insulating member in some other embodiments of the present application;

[0054] FIG10 is a schematic diagram of an insulating member in some other embodiments of the present application.

[0055] Icons: 20-battery cell; 21-electrode assembly; 210-first end face; 211-peripheral surface; 22-insulating member; 220-first insulating portion; 2200-first surface; 2201-second surface; 221-second insulating portion; 23-protrusion; 230-groove; 231-reinforcement member; 24-shell; 240-shell; 2400-first end wall; 2401-side wall; 241-end cover; 25-electrode terminal; 26-adapter; 27-through hole; y-length direction of the first end face; x-width direction of the first end face; z-thickness direction of the first insulating portion; 100-battery; 1000-vehicle; 200-controller; 300-motor; 10-box; 11-first box body; 12-second box body. DETAILED DESCRIPTION

[0056] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0057] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only 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 drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0058] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the 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.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0060] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0061] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0062] The term "plurality" used in this application refers to two or more (including two).

[0063] In this application, battery cells may include lithium-ion battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

[0064] 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. A battery generally includes 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.

[0065] A battery cell includes a housing, an electrode assembly, and an electrolyte. The electrode assembly is located within the housing. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates 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 uncoated positive current collector protrudes from the coated current collector, serving as the positive tab. For lithium-ion batteries, for 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. 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 uncoated negative current collector protrudes from the coated negative current collector, serving as the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator provides electronic insulation, separating the adjacent positive and negative electrodes to prevent short circuits. The separator has numerous micropores that allow the free passage of electrolyte ions and offers excellent permeability to lithium ions.

[0066] The battery cell also includes an insulating member, which is coated on the electrode assembly and can insulate and isolate the outer shell and the electrode assembly. In some embodiments, the insulating member can be an insulating film, Mylar film, etc.

[0067] In some embodiments, the electrode terminal has a first end surface and an outer peripheral surface surrounding an edge of the first end surface. The insulating member may include a first insulating portion covering the first end surface and a second insulating portion covering the outer peripheral surface.

[0068] In the development of battery technology, how to improve the energy density of batteries is a technical problem that needs to be solved urgently.

[0069] Currently, the outer shell of a battery cell, such as a square battery cell, includes a first end wall and a side wall surrounding the first end wall. The inner surface of the side wall is connected to the inner surface of the first end wall by a rounded corner transition (those skilled in the art often refer to this rounded corner as the inner rounded corner). To reduce the risk of damage to the electrode assembly due to interference with the rounded corner, a bottom support plate is often provided between the electrode terminal and the first end wall to support and elevate the electrode assembly. However, the provision of the bottom support plate increases the weight of the battery, resulting in a decrease in the battery's weight energy density.

[0070] In view of this, to improve the problem of reduced battery weight and energy density caused by the provision of a bottom support plate, some embodiments of the present application provide a battery cell, which includes an electrode assembly and an insulating member. The insulating member includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion covering the first end face of the electrode assembly, and the second insulating portion covering the outer peripheral surface of the electrode assembly. The first insulating portion has a first surface facing away from the first end face and a second surface facing the first end face, and the first surface and / or the second surface are provided with a protrusion.

[0071] In the above solution, by providing protrusions on the first and / or second surfaces, they can replace the existing base plate of the battery cell, providing support for the electrode assembly. The protrusions elevate the electrode assembly, reducing the risk of interference between the fillet between the first end wall and the side wall of the housing and the electrode assembly, which could damage the electrode assembly. Since the protrusions replace the base plate, they can save weight from the base plate itself, effectively reducing the weight of the battery cell and thereby increasing the battery's weight energy density.

[0072] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices 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 device.

[0073] 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.

[0074] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0075] Please refer to the figure, which is a schematic diagram of the structure of the vehicle in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle. The battery can be provided at the bottom of the vehicle, at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0076] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] Please refer to FIG. 2 , which is a three-dimensional exploded view of a battery 100 in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20 . The battery cell 20 is used to be accommodated in the housing 10 .

[0078] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0079] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0080] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0081] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0082] Each battery cell 20 may be a secondary battery or a primary battery, 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, prismatic, or in other shapes.

[0083] Some embodiments of the present application provide a battery cell 20, please refer to Figures 3 to 6, Figure 3 is a three-dimensional exploded view of the battery cell 20 in some embodiments of the present application, Figure 4 is a partial schematic diagram of the internal structure of the battery cell 20 in some embodiments of the present application, Figure 5 is a schematic diagram of the partial structure of the outer shell 24 in some embodiments of the present application, and Figure 6 is a schematic diagram of the first insulating part 220 and the electrode assembly 21 in some embodiments of the present application.

[0084] The battery cell 20 includes an electrode assembly 21 and an insulating member 22. The insulating member 22 includes a first insulating portion 220 and a second insulating portion 221 that are connected to each other. The first insulating portion 220 covers the first end surface 210 of the electrode assembly 21, and the second insulating portion 221 covers the outer peripheral surface 211 of the electrode assembly 21. The first insulating portion 220 has a first surface 2200 facing away from the first end surface 210 and a second surface 2201 facing the first end surface 210. The first surface 2200 and / or the second surface 2201 are provided with protrusions 23.

[0085] The battery cell 20 includes a housing 24, which is used to accommodate the electrode assembly 21. The housing 24 may also be used to accommodate an electrolyte, such as an electrolyte solution. Referring to FIG3 , in some embodiments, the housing 24 includes a shell 240 and an end cap 241. The shell 240 defines a cavity for accommodating the electrode assembly 21. The shell 240 has an opening that communicates with the cavity. The end cap 241 seals the opening of the shell 240, forming a sealed space for accommodating the electrode assembly 21 and the electrolyte.

[0086] The housing 240 includes a sidewall 2401 and a first end wall 2400. The first end wall 2400 is disposed opposite the end cap 241. The sidewall 2401 surrounds the edge of the first end wall 2400 to form a receiving cavity together with the first end wall 2400. Referring to FIG5 , the inner surface of the sidewall 2401 transitions to the inner surface of the first end wall 2400 through a rounded corner, i.e., an inner rounded angle is formed between the two. In some embodiments, the first end wall 2400 serves as the bottom wall of the housing 24.

[0087] In some embodiments, the material of the shell 24 can be metal or a combination of metal and non-metal. For example, the shell 24 can be made of metal, such as aluminum, copper, iron, steel or aluminum alloy; for example, part of the shell 24 can be made of metal, and the rest can be made of non-metal, such as the end cover 241 of the shell 24 can be made of metal, and the shell 240 or other parts of the shell 24 can be made of non-metallic materials.

[0088] The housing 24 can have various shapes, such as a cylindrical or prismatic structure. The shape of the housing 24 can be determined based on the specific shape of the electrode assembly 21. For example, if the electrode assembly 21 is cylindrical, a cylindrical housing 24 can be used; if the electrode assembly 21 is square, a square housing 24 can be used.

[0089] The electrode assembly 21 is a component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 21 can be various. For example, the electrode assembly 21 can be a wound structure formed by winding the electrode sheet and the diaphragm, and the main body of the electrode assembly 21 is cylindrical. The electrode sheet includes a first electrode sheet and a second electrode sheet with opposite polarities, and the first electrode sheet and the second electrode sheet can be separated by a diaphragm. The main material of the diaphragm can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The electrode tabs of the electrode assembly 21 can include a first electrode tab and a second electrode tab with opposite polarities. In some embodiments, the electrode tabs of the electrode assembly 21 can be connected to the electrode terminal 25 through an adapter 26 to achieve output or input current.

[0090] Referring to Figures 3 and 6 , the electrode assembly 21 includes a first end surface 210 and an outer peripheral surface 211. The first end surface 210 may be the surface of the electrode assembly 21 facing the first end wall 2400 of the housing 24, and the outer peripheral surface 211 is a portion surrounding the edge of the first end surface 210. The tabs of the electrode assembly 21 may be located on the second end surface, which may be disposed opposite the first end surface 210.

[0091] The insulating member 22 is a component used to coat the outer surface of the electrode assembly 21. The insulating member 22 can be made of a material with insulating properties, such as polyethylene, polypropylene, or polyethylene terephthalate. In some embodiments, the insulating member 22 can be a thin insulating film. In some embodiments, the insulating member 22 coats the outer surface of the electrode assembly 21, and an adhesive layer or adhesive can be provided between the insulating member 22 and the electrode assembly 21.

[0092] In some embodiments, the insulating member 22 may cover at least a portion of the first end surface 210 and the outer peripheral surface 211 of the electrode assembly 21. The insulating member 22 includes a first insulating portion 220 and a second insulating portion 221 connected to each other. The first insulating portion 220 and the second insulating portion 221 may be integrally manufactured or may be separate components connected by bonding, welding, or connecting members.

[0093] The first insulating portion 220 is used to cover the first end surface 210 of the electrode assembly 21 and to insulate and isolate the first end surface 210 from the first end wall 2400. The second insulating portion 221 is used to cover the outer peripheral surface 211 of the electrode assembly 21 and to insulate and isolate the outer peripheral surface 211 of the electrode assembly 21 from the side wall 2401 of the housing 24.

[0094] The first insulating portion 220 can be used to support the electrode assembly 21. This means that the weight of the electrode assembly 21 can act on the first insulating portion 20, and the first insulating portion 20 can support the electrode assembly 21. For example, when the battery cell 20 is placed vertically, the first end surface 210 is the lowest part of the electrode assembly 21. The first insulating portion 220 is located below the entire electrode assembly 21, overcoming the weight of the electrode assembly 21 and supporting the electrode assembly 21.

[0095] 6 , the first insulating portion 220 has a first surface 2200 and a second surface 2201 disposed opposite each other. The first surface 2200 is further away from the first end surface 210 than the second surface 2201, i.e., the first surface 2200 is the outer surface of the first insulating portion 220. The second surface 2201 faces the first end surface 210 relative to the first surface 2200, i.e., the second surface 2201 is the inner surface of the first insulating portion 220.

[0096] “The first surface 2200 and / or the second surface 2201 is provided with a protrusion 23” can be understood as, in some embodiments, the first surface 2200 is provided with a protrusion 23, which protrudes along the direction of the second surface 2201 toward the first surface 2200; in other embodiments, the second surface 2201 is provided with a protrusion 23, which protrudes along the direction of the first surface 2200 toward the second surface 2201; in some other embodiments, the first surface 2200 is provided with a protrusion 23, which protrudes along the direction of the second surface 2201 toward the first surface 2200, and at the same time, the second surface 2201 is also provided with a protrusion 23, which protrudes along the direction of the first surface 2200 toward the second surface 2201.

[0097] In some embodiments, the material of the protrusion 23 can be the same as or different from the material of the first insulating portion 220. In some embodiments, the protrusion 23 can be bonded, welded, or connected to the first insulating portion 220 via a connecting member. In some embodiments, the protrusion 23 can be integrally formed with the first insulating portion 220.

[0098] In the above solution, by providing protrusions 23 on the first surface 2200 and / or the second surface 2201, the bottom support plate of the current battery cell 20 can be replaced, providing support for the electrode assembly 21. The protrusions 23 elevate the electrode assembly 21, thereby reducing the risk of interference between the fillet between the first end wall 2400 and the side wall 2401 of the housing 24 and the electrode assembly 21, thereby damaging the electrode assembly 21. Since the protrusions 23 can replace the bottom support plate, the weight of the bottom support plate itself can be saved, thereby effectively reducing the weight of the battery cell 20 and thereby improving the battery's weight energy density.

[0099] According to some embodiments of the present application, referring to FIG. 6 , the first surface 2200 is provided with a protrusion 23 , and the second surface 2201 is provided with a groove 230 at a position corresponding to the protrusion 23 .

[0100] In some other embodiments, the second surface 2201 is provided with a protrusion 23 , and the first surface 2200 is provided with a groove 230 at a position corresponding to the protrusion 23 .

[0101] The groove 230 is a portion corresponding to the protrusion 23. For example, a groove 230 is provided on the first surface 2200 and protrudes from the second surface 2201 toward the first surface 2200, corresponding to the position of the protrusion 23. The second surface 2201 can also be provided with a groove 230 that is recessed from the second surface 2201 toward the first surface 2200. For another example, a groove 230 is provided on the second surface 2201 and protrudes from the first surface 2200 toward the second surface 2201, corresponding to the position of the protrusion 23. The first surface 2200 can also be provided with a groove 230 that is recessed from the first surface 2200 toward the second surface 2201.

[0102] In some embodiments, the protrusion 23 may be formed on the first insulating portion 220 by stamping. In other embodiments, the groove 230 may be formed on the first insulating portion 220 by digging.

[0103] In the above solution, by setting a groove 230 on the other side of the first insulating part 220 corresponding to the protrusion 23, compared with the solution of directly setting the protrusion 23 on the first insulating part 220, the weight increase caused by setting the protrusion 23 can be effectively reduced, so that the battery has a higher weight energy density.

[0104] According to some embodiments of the present application, a reinforcement member 231 is disposed in the groove 230 .

[0105] The reinforcement member 231 is a component disposed in the groove 230 . The reinforcement member 231 may improve the structural strength of the first insulating portion 220 and reduce the risk of the protrusion 23 collapsing due to the pressure of the electrode assembly 21 .

[0106] In some embodiments, the reinforcement member 231 may be a reinforcing rib or rib provided on the wall of the groove 230. The reinforcement member 231 may be integrally formed with the first insulating portion 220, or the reinforcement member 231 may be connected to the first insulating portion 220 by welding, bonding, or other methods. In some embodiments, the reinforcement member 231 may be a filler provided within the groove 230. The filler may or may not completely fill the groove 230. In some embodiments, the reinforcement member 231 may be a coating provided on the inner surface of the groove 230.

[0107] In the above solution, by arranging a reinforcement 231 in the groove 230, the structural strength of the first insulating part 220 can be improved, the supporting effect of the protrusion 23 on the electrode assembly 21 can be improved, and the risk of the protrusion 23 collapsing due to the weight of the electrode assembly 21 can be reduced, thereby effectively replacing the bottom support plate, so that the battery has higher reliability while having a higher weight energy density.

[0108] According to other embodiments of the present application, please refer to FIG7 , which is a schematic diagram of the first insulating portion 220 , the electrode assembly 21 , and the reinforcing member 231 in other embodiments of the present application. The reinforcing member 231 includes a filler disposed in the groove 230 .

[0109] The filler may be a component disposed in the groove 230 to enhance the structural strength of the first insulating member 22 .

[0110] The filler can completely fill the groove 230, for example, the space between the electrode assembly 21 and the groove 230 is completely filled with the filler. The filler can also partially fill the groove 230, for example, when the filler is provided, a gap exists between the electrode assembly 21, the groove 230, and the filler. In some embodiments, one end of the filler can contact the first end wall 2400, and the other end of the filler can contact the bottom of the groove 230.

[0111] In some embodiments, the filler may be a lightweight porous structure, for example, the filler may be a sponge, which can improve the supporting effect of the protrusion 23 on the electrode assembly 21 and the infiltration effect of the electrolyte.

[0112] In the above solution, by placing a filler within the groove 230, the structural strength of the first insulating portion 220 can be improved, the support provided by the protrusion 23 to the electrode assembly 21 can be enhanced, and the risk of the protrusion 23 collapsing due to the weight of the electrode assembly 21 can be reduced, thereby enhancing the battery's reliability. In some embodiments, the filler can be a porous structure, such as a sponge. By placing a sponge within the groove 230, the support provided by the protrusion 23 to the electrode assembly 21 can be enhanced, while also allowing for the infiltration of more electrolyte, thereby improving the battery's charge and discharge performance.

[0113] According to some embodiments of the present application, the reinforcement member 231 includes a coating applied to the inner surface of the groove 230 .

[0114] The coating may be a component coated on the wall surface of the groove 230 , and serves to enhance the structural strength of the first insulating member 22 .

[0115] For example, in some embodiments, the first surface 2200 is formed with protrusions 23, and the second surface 2201 is formed with grooves 230. A coating can be applied to the second surface 2201 and dried to form a coating. In some embodiments, the coating can be an insulating coating.

[0116] In the above solution, by providing a coating on the inner surface of the groove 230, the anti-collapse ability of the protrusion 23 can be improved, so that the protrusion 23 effectively supports the electrode assembly 21, thereby effectively replacing the bottom support plate, so that the battery has higher reliability while having a higher weight energy density.

[0117] In some embodiments, the reinforcement 231 may include a filler and a coating, that is, a coating is provided on the inner surface of the groove 230 , and a filler is provided in the groove 230 .

[0118] According to some embodiments of the present application, see Figures 8 and 9. Figure 8 is a schematic diagram of the insulating member 22 in some embodiments of the present application, and Figure 9 is a schematic diagram of the insulating member 22 in other embodiments of the present application. There are multiple protrusions 23, and the multiple protrusions 23 are arranged at intervals.

[0119] In some embodiments, the number of protrusions 23 may be multiple, for example, two, three, four, five, six or more.

[0120] Two adjacent protrusions 23 are spaced apart. The spacing between the protrusions 23 can be the same or different.

[0121] In some embodiments, referring to Figures 8 and 9 , the first end surface 210 may be rectangular, and the plurality of protrusions 23 may be spaced apart along the length direction y of the first end surface. Referring to Figure 9 , the first end surface 210 may be rectangular, and the plurality of protrusions 23 may be spaced apart along the width direction x of the first end surface.

[0122] In the above solution, by providing multiple protrusions 23 to jointly support the electrode assembly 21, the risk of interference between the electrode assembly 21 and the outer shell 24 can be effectively reduced, that is, the protrusions 23 can effectively replace the bottom plate, so that the battery has higher reliability while having a higher weight energy density.

[0123] According to some embodiments of the present application, the protrusion 23 is a circular protrusion, an elliptical protrusion, or a long strip protrusion.

[0124] In some embodiments, the protrusions 23 on the first insulating portion 220 can be circular, oval, or elongated. For example, in some embodiments, the first insulating portion 220 has a plurality of protrusions 23, some of which are circular, some of which are oval, and the remaining of which are elongated.

[0125] 8 , the first surface 2200 is provided with a plurality of protrusions 23 , and each protrusion 23 is a long strip protrusion. 9 , the first surface 2200 is provided with a plurality of protrusions 23 , and each protrusion 23 is a circular protrusion.

[0126] In the above solution, the shape of the protrusion 23 can be diversified, which reduces the difficulty of processing the protrusion 23 and improves the manufacturing efficiency of the battery.

[0127] According to some embodiments of the present application, the protrusion 23 is a long strip protrusion 23 , the length direction of the protrusion 23 is parallel to the width direction x of the first end surface, and the width direction of the protrusion 23 is parallel to the length direction y of the first end surface.

[0128] In some embodiments, the first end surface 210 may be rectangular, and the protrusions 23 may be elongated strips. The length direction of the protrusions 23 is parallel to the width direction x of the first end surface, and the width direction of the protrusions 23 is parallel to the length direction y of the first end surface. In some embodiments, multiple protrusions 23 may be spaced apart along the length direction y of the first end surface. In other embodiments, multiple protrusions 23 may be spaced apart along the width direction x of the first end surface.

[0129] In the above scheme, by limiting the protrusion 23 to a long strip protrusion 23, and limiting the length direction of the protrusion 23 to be parallel to the width direction x of the first end face, the protrusion 23 can effectively support the electrode assembly 21, so that the battery has higher reliability under the condition of higher weight energy density.

[0130] According to some embodiments of the present application, a plurality of protrusions 23 are arranged at intervals along the length direction y of the first end surface.

[0131] In the above solution, by limiting the plurality of protrusions 23 to be spaced apart along the length direction y of the first end face, the plurality of long strip protrusions 23 can jointly and effectively support the electrode assembly 21, so that the battery has higher reliability under the condition of higher weight energy density.

[0132] According to some embodiments of the present application, referring to FIG. 3 and FIG. 8 , the maximum length of the first end surface 210 is L1 , and the minimum distance between two adjacent protrusions 23 is L2 , satisfying L1 / 100≤L2≤L1 / 2.

[0133] In FIG1 , the position corresponding to the maximum length L1 of the first end surface 210 is exemplarily shown by the first insulating portion 220 , and in FIG8 , the position of the minimum distance L2 between two adjacent protrusions 23 is exemplarily shown.

[0134] In some embodiments, the electrode assembly 21 is square, and its first end surface 210 can be rectangular. The lengthwise edge of the electrode assembly 21 can have a maximum length L1. In some embodiments, the protrusions 23 are evenly spaced, and the distance between any two adjacent protrusions 23 can be a minimum distance L2. For example, in some embodiments, the protrusions 23 are spaced along the lengthwise direction y of the first end surface, and the minimum distance between any two adjacent protrusions 23 along the lengthwise direction y of the first end surface can be L2.

[0135] In some embodiments, the value range of L2 can be between L1 / 100 and L1 / 2, for example, L2 can be L1 / 100, L1 / 99, L1 / 98, L1 / 97...L1 / 5, L1 / 6, L1 / 5, L1 / 4, L1 / 3 or L1 / 2.

[0136] In the above scheme, the minimum spacing L2 between two adjacent protrusions 23 is limited by the maximum length L1 of the first end face 210, so that L1 and L2 satisfy L1 / 100≤L2≤L1 / 2, which enables multiple protrusions 23 to effectively support the electrode assembly 21, so that the battery has higher reliability under the condition of higher weight energy density.

[0137] According to some embodiments of the present application, referring to Figures 5 and 6 , the battery cell 20 further includes a housing 24, and the electrode assembly 21 is disposed within the housing 24. The dimension of the protrusion 23 in a direction perpendicular to the first end face 210 is h. The housing 24 includes a first end wall 2400 and a side wall 2401. The first end face 210 is disposed opposite the first end wall 2400. The side wall 2401 is disposed around the edge of the first end wall 2400. The inner surface of the side wall 2401 is connected to the inner surface of the first end wall 2400 by a fillet transition. The radius of the fillet is R, satisfying the condition R / 10≤h≤2R.

[0138] “The dimension of the protrusion 23 in the direction perpendicular to the first end surface 210 is h” can be understood as the height by which the protrusion 23 raises the electrode assembly 21 is h.

[0139] In some embodiments, the value of R may range from R / 10 to 2R. For example, R may be R / 10, R / 9, R / 8, R / 7, R / 6, . . . 1.7R, 1.8R, 1.9R, or 2R.

[0140] In the above scheme, the dimension h of the protrusion 23 in the direction perpendicular to the first end face 210 can be regarded as the dimension of the electrode assembly 21 lifted by the protrusion 23. By limiting the dimension h of the protrusion 23 in the direction perpendicular to the first end face 210 and the radius R of the fillet between the inner surface of the side wall 2401 and the inner surface of the first end wall 2400 to satisfy R / 10≤h≤2R, the protrusion 23 can effectively replace the bottom support plate to lift the electrode assembly 21, so as to reduce the risk of interference between the electrode assembly 21 and the outer shell 24 of the battery cell 20, causing damage to the electrode assembly 21, and making the battery have higher reliability.

[0141] According to some embodiments of the present application, 3R / 10≤h≤R is satisfied.

[0142] In some embodiments, the value range of R may be between 3R / 10 and R. For example, R may be 3R / 10, 4R / 10, 5R / 10, 6R / 10, 7R / 10, 8R / 10R, 9R / 10R, or R.

[0143] In the above scheme, by limiting h to 3R / 10≤h≤R, the electrode assembly 21 can be effectively raised, reducing the risk of interference between the electrode assembly 21 and the outer shell 24 of the battery cell 20, thereby damaging the electrode assembly 21. At the same time, the risk of the volume energy density being affected due to the protrusion 23 occupying too much space is also reduced.

[0144] In some embodiments, the dimension of the protrusion 23 in the direction perpendicular to the first end face 210 is h, the thickness of the first insulating portion 220 is t, the tensile strength of the first insulating portion 220 is σ, and the dimension of the electrode assembly 21 in the direction perpendicular to the first end face 210 is H, satisfying 1≤H / (σ*t / h)≤10.

[0145] In some embodiments, the value of H / (σ*t / h) can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or any value between two adjacent values.

[0146] Under the same material, the greater the thickness t of the first insulating portion 220, the greater the strength of the first insulating portion 220, and the better the support effect on the electrode assembly 21. The greater the tensile strength σ of the first insulating portion 220, the greater the strength of the first insulating portion 220, and the better the support effect on the electrode assembly 21.

[0147] The larger the dimension H of the electrode assembly 21 in the direction perpendicular to the first end surface 210 , the heavier the electrode assembly 21 is, and the greater the pressure on the first insulating portion 220 , under the same material.

[0148] In the above scheme, the dimension H of the electrode assembly 21 in the direction perpendicular to the first end face 210, the dimension h of the protrusion 23 in the direction perpendicular to the first end face 210, the thickness t and the tensile strength σ of the first insulating part 220 can be limited by 1≤H / (σ*t / h)≤10, so that the protrusion 23 can effectively support and lift the electrode assembly 21, thereby effectively replacing the bottom plate, so that the battery has higher reliability while having higher weight energy density.

[0149] According to some embodiments of the present application, 3≤H / (σ*t / h)≤8 is satisfied.

[0150] In some embodiments, the value of H / (σ*t / h) can be 3, 4, 5, 6, 7, 8 or any value between two adjacent values.

[0151] In the above scheme, the dimension H of the electrode assembly 21 in the direction perpendicular to the first end face 210, the dimension h of the protrusion 23 in the direction perpendicular to the first end face 210, the thickness t and the tensile strength σ of the first insulating part 220 can be limited by 3≤H / (σ*t / h)≤8. This enables the protrusion 23 to effectively support and raise the electrode assembly 21, thereby effectively replacing the bottom plate, so that the battery has higher reliability while having higher weight energy density.

[0152] According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the first insulating portion 220 is provided with a through hole 27 , and along the thickness direction z of the first insulating portion, the projection of the through hole 27 does not overlap with the projection of the protrusion 23 .

[0153] Along the thickness direction z of the first insulating portion, the through hole 27 may penetrate the first insulating portion 220. In some embodiments, the through hole 27 may be spaced apart from the protrusion 23.

[0154] In the above solution, by providing a through hole 27 on the first insulating portion 220 , on the one hand, the through hole 27 can be used to realize the loading and positioning of the insulating member 22 , and on the other hand, the electrolyte can be infiltrated from the through hole to the electrode assembly, thereby improving the infiltration effect of the electrolyte.

[0155] In some other embodiments, the through hole 27 may be formed in the protrusion 23 .

[0156] According to some embodiments of the present application, a through hole 27 is provided at the end of the first insulating part 220 along the length direction of the first insulating part 220; and / or a through hole 27 is provided at the end of the first insulating part 220 along the width direction of the first insulating part 220.

[0157] In some embodiments, through holes 27 are provided at the ends of the first insulating portion 220 along the length direction of the first insulating portion 220. In some embodiments, through holes 27 are provided at the ends of the first insulating portion 220 along the width direction of the first insulating portion 220. In some embodiments, through holes 27 are provided at the ends of the first insulating portion 220 along the length direction of the first insulating portion 220 and at the ends of the first insulating portion 220 along the width direction of the first insulating portion 220.

[0158] 9 or 10 . Along the length direction of the first insulating portion 220 , both ends of the first insulating portion 220 are provided with through holes 27 , and each end is provided with two through holes 27 , and the two through holes 27 are spaced apart along the width direction of the first insulating portion 220 .

[0159] In the above scheme, by setting the through hole 27 at the end in the length direction and / or the end in the width direction of the first insulating part 220, on the one hand, it is beneficial to the loading and positioning of the insulating part 22, and on the other hand, it is beneficial to the infiltration effect of the electrolyte; on the other hand, compared with the through hole 27 being set in the middle of the first insulating part 220, the through hole 27 is set at the end of the first insulating part 220, which can reduce the impact of the structural strength of the first insulating part 220 caused by the setting of the through hole 27, and improve the supporting effect of the first insulating part 220 on the electrode assembly 21, thereby effectively replacing the bottom plate, so that the battery has higher reliability under the condition of higher weight energy density.

[0160] According to some other embodiments of the present application, please refer to Figure 10, which is a schematic diagram of an insulating member in some other embodiments of the present application. There are multiple through holes 27, and a protrusion 23 is provided between two adjacent through holes 27.

[0161] In some embodiments, a plurality of through holes 27 are provided on the first insulating portion 220. For example, in FIG10 , along the length direction of the first insulating portion 220, through holes 27 are provided at both ends of the first insulating portion 220, and two through holes 27 are provided at each end. The two through holes 27 are spaced apart along the width direction of the first insulating portion 220.

[0162] In the above scheme, on the one hand, multiple through holes 27 are provided, which can be beneficial to the infiltration effect of the electrolyte and the loading and positioning of the insulating part 22; on the other hand, a protrusion 23 is provided between two adjacent protrusions 23, which can compensate for the loss of structural strength of the first insulating part 220 caused by the provision of the through hole 27, and improve the supporting effect of the first insulating part 220 on the electrode assembly 21, thereby effectively replacing the bottom plate, so that the battery has higher reliability under the condition of higher weight energy density.

[0163] Some embodiments of the present application further provide a battery, which includes the battery cell 20 provided above.

[0164] Some embodiments of the present application further provide an electrical device, the electrical device comprising the battery cell 20 provided above. The battery cell 20 is used to provide electrical energy.

[0165] The present application also provides a battery cell 20 , please refer to FIG. 3 to FIG. 9 .

[0166] The battery cell 20 includes a housing 24, an electrode assembly 21, and an insulating member 22. The housing 24 includes a sidewall 2401 and a first end wall 2400, which may be the bottom wall of the housing 24. The electrode assembly 21 is disposed inside the housing 24. The insulating member 22 covers the electrode assembly 21.

[0167] The insulating member 22 includes a first insulating portion 220 and a second insulating portion 221 connected to each other. The first insulating portion 220 covers the first end surface 210 of the electrode assembly 21, and the second insulating portion 221 covers the outer peripheral surface 211 of the electrode assembly 21. The first end surface 210 of the electrode assembly 21 can be the bottom surface of the electrode assembly 21.

[0168] The first insulating portion 220 has a first surface 2200 and a second surface 2201 that are oppositely disposed. The second surface 2201 can be attached to the first end surface 210. A protrusion 23 is formed on the first surface 2200, and a groove 230 is formed on the second surface 2201 corresponding to the position of the protrusion 23. The shape of the protrusion 23 can be elongated, circular, or elliptical.

[0169] The protrusions 23 support and elevate the electrode assembly 21. The protrusions 23 can replace the bottom support plate in the current battery cell 20 to reduce weight and increase the weight energy density of the battery cell 20.

[0170] 8 and 9 , a plurality of protrusions 23 are spaced apart and can jointly support the electrode assembly 21 and elevate the electrode assembly 21 to reduce the risk of interference between the fillet between the first end wall 2400 and the side wall 2401 of the outer shell 24 and the electrode assembly 21, thereby damaging the electrode assembly 21.

[0171] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: Electrode assembly; An insulating member, comprising a first insulating portion and a second insulating portion connected to each other, wherein the first insulating portion is coated on a first end surface of the electrode assembly, and the second insulating portion is coated on an outer peripheral surface of the electrode assembly; The first insulating portion has a first surface facing away from the first end surface and a second surface facing the first end surface, and the first surface and / or the second surface are provided with protrusions.

2. The battery cell according to claim 1, wherein: The first surface is provided with the protrusion, and the second surface is provided with a groove corresponding to the position of the protrusion; Alternatively, the second surface is provided with the protrusion, and the first surface is provided with a groove at a position corresponding to the protrusion.

3. The battery cell according to claim 2, wherein: A reinforcement piece is arranged in the groove.

4. The battery cell according to claim 3, wherein: The reinforcement member includes a filler disposed in the groove.

5. The battery cell according to claim 3 or 4, wherein: The reinforcement member includes a coating applied to an inner surface of the groove.

6. The battery cell according to any one of claims 1 to 5, wherein: The number of the protrusions is multiple, and the multiple protrusions are arranged at intervals.

7. The battery cell according to claim 6, wherein: The protrusion is a circular protrusion, an elliptical protrusion or a long strip protrusion.

8. The battery cell according to claim 7, wherein: The protrusion is a long strip protrusion, the length direction of the protrusion is parallel to the width direction of the first end surface, and the width direction of the protrusion is parallel to the length direction of the first end surface.

9. The battery cell according to claim 8, wherein: The plurality of protrusions are arranged at intervals along the length direction of the first end surface.

10. The battery cell according to any one of claims 6 to 9, wherein: The maximum length of the first end surface is L1, and the minimum distance between two adjacent protrusions is L2, satisfying L1 / 100≤L2≤L1 / 2.

11. The battery cell according to any one of claims 1 to 10, wherein: The battery cell further comprises a housing, and the electrode assembly is disposed in the housing; The dimension of the protrusion in a direction perpendicular to the first end surface is h; The shell includes a first end wall and a side wall, the first end face is arranged opposite to the first end wall, the side wall is arranged around the edge of the first end wall, the inner surface of the side wall is connected to the inner surface of the first end wall by a rounded transition, the radius of the rounded corner is R, and satisfies R / 10≤h≤2R.

12. The battery cell according to claim 11, wherein: Satisfies, 3R / 10≤h≤R.

13. The battery cell according to any one of claims 1 to 12, wherein: The dimension of the protrusion in a direction perpendicular to the first end face is h, the thickness of the first insulating portion is t, the tensile strength of the first insulating portion is σ, and the dimension of the electrode assembly in a direction perpendicular to the first end face is H, satisfying 1≤H / (σ*t / h)≤10.

14. The battery cell according to claim 13, wherein: Satisfies 3≤H / (σ*t / h)≤8.

15. The battery cell according to any one of claims 1 to 14, wherein: The first insulating portion is provided with a through hole, and along a thickness direction of the first insulating portion, a projection of the through hole does not overlap with a projection of the protrusion.

16. The battery cell according to claim 15, wherein: The through hole is provided at an end of the first insulating portion along the length direction of the first insulating portion; And / or, the through hole is provided at an end of the first insulating portion along a width direction of the first insulating portion.

17. The battery cell according to claim 15 or 16, wherein: There are multiple through holes, and the protrusion is arranged between two adjacent through holes.

18. A battery, wherein: A battery cell comprising the battery cell according to any one of claims 1 to 17.

19. An electrical device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 18, wherein the battery cell is used to provide electrical energy.

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