Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The cover of the shell of the battery monomer comprises a first part and a second part which are connected to each other, and the second part is closer to the electrode assembly than the first part. The first insulating piece is located in the first cavity, and the first insulating piece forms a second cavity with a second opening, and the second opening is arranged towards the cover. Since the first insulating piece is inwardly recessed at the end face where the second opening is located to form a recess along the thickness direction of the wall of the second insulating piece, and the bottom surface of the recess is oppositely arranged to the surface of the second part towards the first cavity along the thickness direction of the cover, the recess can provide space for the second opening of the first insulating piece to avoid the second part which is closer to the electrode assembly than the first part, thereby reducing the possibility of contact between the first insulating piece and the second part, reducing the possibility of collision at the connection between the first insulating piece and the second part and the shell, and improving the reliability of the battery monomer.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for their reliability are also increasing. How to improve the reliability of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell has good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, and a first insulating member. The casing includes a housing and a cover. The housing forms a first cavity with a first opening, and the cover closes to the first opening. The electrode assembly is located in the first cavity. The cover includes a first part and a second part connected to each other, with the second part being closer to the electrode assembly than the first part. The first insulating member is located in the first cavity and forms a second cavity with a second opening facing the cover. The end face where the second opening is located is recessed inward to form a recess, which penetrates the second insulating member along the thickness direction of the second insulating member wall. Along the thickness direction of the cover, the bottom surface of the recess is opposite to the surface of the second part facing the first cavity.

[0006] In the above structure, since the first insulating member is recessed inward at the end where the second opening is located to form a recess that penetrates the wall of the second insulating member along the thickness direction of the wall of the second insulating member, and the bottom surface of the recess is disposed opposite to the surface of the second part facing the first cavity along the thickness direction of the cover, the recess can provide space for the second opening of the first insulating member to avoid the second part which is closer to the electrode assembly than the first part, reducing the possibility of the first insulating member contacting the second part, thereby reducing the possibility of the first insulating member colliding with the second part and the connection between the housing and the casing, which is beneficial to improving the reliability of the connection between the cover and the housing, improving the reliability of the outer casing, and improving the reliability of the battery cell.

[0007] According to some embodiments of this application, the battery cell further includes a second insulating member. The second insulating member includes a first insulating portion and a second insulating portion that are connected to each other. The first insulating portion is disposed on the side of the first portion facing the electrode assembly, and the second insulating portion is disposed on the side of the second portion facing the electrode assembly. A first connecting structure is disposed on the surface of the first insulating portion facing the electrode assembly, and the first connecting structure is connected to the first insulating member. A second connecting structure is disposed on the surface of the second insulating portion facing the electrode assembly, and the second connecting structure is connected to the first insulating member.

[0008] According to some embodiments of this application, in a battery cell, at least a portion of the first connecting structure extends into the second cavity from the second opening and is connected to the wall surface of the first insulating member facing the second cavity; at least a portion of the second connecting structure extends into the second cavity from the second opening and is connected to the wall surface of the first insulating member facing the second cavity; along the thickness direction of the cover, the dimension of the first connecting structure extending into the second cavity is greater than the dimension of the second connecting structure extending into the second cavity.

[0009] According to some embodiments of this application, the bottom surface of the recess is provided with a notch, which penetrates the wall of the first insulating member along the thickness direction of the first insulating member, and the second connecting structure is connected to the first insulating member at the notch.

[0010] According to some embodiments of this application, the battery cell includes two first walls disposed opposite to each other along a first direction and two second walls disposed opposite to each other along a second direction. The second walls are connected between the two first walls. The first direction, the second direction and the thickness direction of the cover are perpendicular to each other. The area of ​​the surface of the first wall away from the second cavity is greater than the area of ​​the surface of the second wall away from the second cavity. A recess is disposed on the first wall. In the thickness direction of the first wall, the central axis of the notch, the central axis of the second connecting structure and the central axis of the recess coincide.

[0011] According to some embodiments of the present application, the battery cell has a notch size of E and a recess size of F in the second direction, with 25% ≤ E / F ≤ 100%.

[0012] According to some embodiments of this application, the battery cell has an E / F ratio of 30% ≤ 100%.

[0013] According to some embodiments of this application, in the battery cell, along the orientation of the second opening, the bottom surface of the notch is closer to the second part than the surface of the second connection structure that is away from the second insulating part.

[0014] According to some embodiments of this application, the distance between the bottom surface of the notch and the surface of the second connecting structure away from the second insulating part along the orientation of the second opening is set to L, where L≥0.3mm.

[0015] According to some embodiments of this application, the battery cell has a thickness of 0.5mm ≤ L ≤ 7mm.

[0016] According to some embodiments of this application, the connection between the bottom surface of the recess and the end face where the second opening is located is provided with a rounded corner, and the connection between the bottom surface of the notch and the bottom surface of the recess is provided with a rounded corner.

[0017] According to some embodiments of this application, the battery cell includes two first walls disposed opposite to each other along a first direction and two second walls disposed opposite to each other along a second direction. The second walls are connected between the two first walls. The first direction, the second direction and the thickness direction of the cover are perpendicular to each other. The area of ​​the surface of the first wall away from the second cavity is greater than the area of ​​the surface of the second wall away from the second cavity. A recess is disposed on the first wall. In the thickness direction of the first wall, the central axis of the recess coincides with the central axis of the first insulating member.

[0018] According to some embodiments of this application, the battery cell further includes electrode terminals, which are disposed in the second part and electrically connected to the electrode assembly.

[0019] Secondly, some embodiments of this application provide a battery device that includes a single battery cell provided by any of the above-described technical solutions.

[0020] Thirdly, some embodiments of this application provide an electrical device that includes the battery device provided by the above-described technical solution, the battery device being used to provide electrical energy.

[0021] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0022] Some embodiments of this application provide a battery cell including a casing, an electrode assembly, and a first insulating member. The casing includes a housing and a cover. The housing forms a first cavity with a first opening, and the cover closes to the first opening. The electrode assembly is located in the first cavity. The cover includes a first part and a second part connected to each other, with the second part being closer to the electrode assembly than the first part. The first insulating member is located in the first cavity and forms a second cavity with a second opening facing the cover. The end face where the second opening is located is recessed inward to form a recess, which penetrates the second insulating member along the thickness direction of the second insulating member wall. Along the thickness direction of the cover, the bottom surface of the recess is opposite to the surface of the second part facing the first cavity. In the above structure, since the first insulating member is recessed inward at the end where the second opening is located to form a recess that penetrates the wall of the second insulating member along the thickness direction of the wall of the second insulating member, and the bottom surface of the recess is disposed opposite to the surface of the second part facing the first cavity along the thickness direction of the cover, the recess can provide space for the second opening of the first insulating member to avoid the second part which is closer to the electrode assembly than the first part, reducing the possibility of the first insulating member contacting the second part, thereby reducing the possibility of the first insulating member colliding with the second part and the connection between the housing and the casing, which is beneficial to improving the reliability of the connection between the cover and the housing, improving the reliability of the outer casing, and improving the reliability of the battery cell. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0024] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0025] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application;

[0026] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of a second insulating element disposed on a cover according to some embodiments of this application;

[0028] Figure 5 A schematic diagram of a structure in which a first insulating member is connected to a second insulating member, provided in some embodiments of this application;

[0029] Figure 6 for Figure 5 Perspective view at point H;

[0030] Figure 7 for Figure 5 Perspective view at point I;

[0031] Figure 8 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application.

[0032] In the diagram:

[0033] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Reception space; 7. Battery cell; 8. Casing;

[0034] 81. Shell; 811. First opening; 812. First cavity;

[0035] 82. Cover; 821. First part; 822. Second part;

[0036] 9. Electrode assembly; 91. Electrode body; 92. Tab;

[0037] 10. First insulating element; 101. Second opening; 102. Second cavity; 103. Recess; 104. Notch; 105. First wall; 106. Second wall;

[0038] 11. Second insulating element; 111. First insulating part; 1111. First connecting structure; 112. Second insulating part; 1121. Second connecting structure; 113. First wall body; 114. Second wall body;

[0039] 12. Electrode terminals;

[0040] X, first direction; Y, second direction; Z, thickness direction of the cover. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0043] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0044] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in individual battery cells such as energy storage containers or energy storage cabinets. Furthermore, the capacity requirements for battery devices are constantly increasing.

[0048] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0049] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0050] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0051] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0052] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0053] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0054] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0055] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0056] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0057] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0058] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0059] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0060] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0061] In a battery cell, to reduce the possibility of electrical connection between the electrode assembly and the casing, an insulating component is usually placed around the outer periphery of the electrode assembly to cover it. In some cases, the casing cover is designed as two interconnected parts, with one part bent towards the electrode assembly. This not only makes it easy for the insulating component around the electrode assembly to come into contact with this part of the cover, but also makes it easy for the insulating component around the electrode assembly to come into contact with the connection point between this part and the casing, causing scratches or damage to the connection structure between the cover and the casing, and reducing the reliability of the connection between the cover and the casing.

[0062] To improve the reliability of the connection between the cover and the housing, and thus the reliability of the battery cell, some embodiments of this application provide a battery cell comprising a housing, an electrode assembly, and a first insulating member. The housing includes a shell and a cover, the shell forming a first cavity with a first opening, the cover closing onto the first opening, and the electrode assembly located in the first cavity. The cover includes a first part and a second part connected to each other, the second part being closer to the electrode assembly than the first part. The first insulating member is located in the first cavity and forms a second cavity with a second opening facing the cover. The end face where the second opening is located is recessed inward to form a recess, the recess penetrating the second insulating member along the thickness direction of the second insulating member wall. Along the thickness direction of the cover, the bottom surface of the recess is opposite to the surface of the second part facing the first cavity. In the above structure, since the first insulating member is recessed inward at the end where the second opening is located to form a recess that penetrates the wall of the second insulating member along the thickness direction of the wall of the second insulating member, and the bottom surface of the recess is disposed opposite to the surface of the second part facing the first cavity along the thickness direction of the cover, the recess can provide space for the second opening of the first insulating member to avoid the second part which is closer to the electrode assembly than the first part, reducing the possibility of the first insulating member contacting the second part, thereby reducing the possibility of the first insulating member colliding with the second part and the connection between the housing and the casing, which is beneficial to improving the reliability of the connection between the cover and the housing, improving the reliability of the outer casing, and improving the reliability of the battery cell.

[0063] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0064] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0065] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0066] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0067] like Figure 1As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0068] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0069] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0070] Figure 2 This is a schematic diagram showing the disassembled structure of the battery device 2 provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0071] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0072] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0073] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called the upper box cover, and the second box part 5b can also be called the lower box 5.

[0074] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells 7 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 5.

[0075] Some embodiments of this application provide a battery cell 7, see reference Figure 3 The battery cell 7 includes a housing 8, an electrode assembly 9, and a first insulating member 10. The housing 8 includes a shell 81 and a cover 82. The shell 81 forms a first cavity 812 with a first opening 811. The cover 82 covers the first opening 811, and the electrode assembly 9 is located in the first cavity 812. The cover 82 includes a first part 821 and a second part 822 that are connected to each other. The second part 822 is closer to the electrode assembly 9 than the first part 821. The first insulating member 10 is located in the first cavity 812 and forms a second cavity 102 with a second opening 101. The second opening 101 is disposed facing the cover 82. The end face where the second opening 101 is located is recessed inward to form a recess 103. The recess 103 penetrates the second insulating member 11 along the thickness direction of the wall of the second insulating member 11. Along the thickness direction Z of the cover, the bottom surface of the recess 103 is opposite to the surface of the second part 822 facing the first cavity 812.

[0076] Electrode assembly 9 is a component in battery cell 7 where an electrochemical reaction occurs. The housing 8 may contain one or more electrode assemblies 9. A tab 92 extends from the end of electrode body 91 toward the cover 82. The electrode assembly 9 may include an electrode body 91 and a tab 92, with the tab 92 extending from one end of electrode body 91 toward the cover 82. The tab 92 is used to connect to the electrode terminal 12 of the battery cell 7, allowing electrical energy from the electrode assembly 9 to be transferred to the electrode terminal 12.

[0077] The electrode body 91 may include a positive electrode, a negative electrode, and a separator. The positive and negative electrode can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrode to isolate them, preventing short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0078] The outer casing 8 can be a component in the battery cell 7 used to form a sealed space, which is used to accommodate other components in the battery cell 7. The casing 81 and the cover 82 are two interconnected parts of the outer casing 8. The casing 81 forms a first cavity 812 with a first opening 811 at one end, allowing components such as the electrode assembly 9 to be easily inserted into the first cavity 812 through the first opening 811. The cover 82 can be a part used to seal the first opening 811, sealing it to form a sealed space in the first cavity 812. For example, the electrode terminal 12 is disposed on the cover 82. Because the cover 82 has a smaller size than the casing 81, the electrode terminal 12 can be easily disposed on the cover 82. The first cavity 812 formed by the casing 81 and the cover 82 is used to accommodate other components in the battery cell 7, such as the electrode assembly 9 and the first insulating member 10, and can protect these components.

[0079] The first part 821 and the second part 822 can be two interconnected parts of the cover 82. The second part 822 is closer to the electrode assembly 9 than the first part 821. For example, by bending the second part 822 relative to the first part 821 towards the electrode assembly 9, the second part 822 is made closer to the electrode assembly 9, thus forming a recess 103 on the outer surface of the cover 82.

[0080] The first insulating member 10 is a component with insulating properties. It can be a thin-film component disposed on the outer periphery of the electrode assembly 9 to reduce the possibility of electrical connection between the electrode assembly 9 and the housing 8. The first insulating member 10 is disposed in the first cavity 812 to form a second cavity 102 with a second opening 101. The second cavity 102 is a spatial structure enclosed by the wall of the first insulating member 10, which is used to accommodate the electrode assembly 9. When the electrode assembly 9 is located, the wall of the first insulating member 10 can cover the outer surface of the electrode assembly 9, thus insulating and isolating the electrode assembly 9 from the housing 8.

[0081] For example, the first insulating element 10 may be made of polyethylene terephthalate, which has excellent dimensional stability, heat resistance, chemical corrosion resistance and high insulation performance, so that the first insulating element 10 can provide good insulation between the electrode assembly 9 and the housing 8.

[0082] The second opening 101 can serve as a channel for connecting the tab 92 in the electrode assembly 9 to the electrode assembly 9. By oriented the second opening 101 toward the cover 82, the electrode assembly 9 can be easily connected to the electrode terminal 12 provided on the cover 82.

[0083] By recessing the end face where the second opening 101 is located inward to form a recess 103, and making the recess 103 penetrate the wall of the first insulating member 10 along the thickness direction of the wall of the first insulating member 10, the recess 103 can remove part of the first insulating member 10 from the second opening 101, thereby increasing the distance between the first insulating member 10 at the recess 103 and the cover 82.

[0084] Since the second part 822 is closer to the electrode assembly 9 than the first part 821, the second part 822 is more likely to come into contact with the second opening 101 of the first insulating member 10. By aligning the bottom surface of the recess 103 with the surface of the second part 822 facing the first cavity 812 along the thickness direction Z of the cover, the recess 103 and the second part 822 are directly opposite each other in the thickness direction Z of the cover. This arrangement of the recess 103 increases the distance between the first insulating member 10 and the second part 822, reducing the possibility of the first insulating member 10 contacting the second part 822, and also reducing the possibility of the first insulating member 10 contacting the connection between the cover 82 and the housing 81.

[0085] For example, the recess 103 can be formed on the first insulating member 10 by cutting the wall of the first insulating member 10.

[0086] In the above structure, since the first insulating member 10 is recessed inward at the end where the second opening 101 is located to form a recess 103 that penetrates the wall of the second insulating member 11 along the thickness direction of the wall of the second insulating member 11, and the bottom surface of the recess 103 is disposed opposite to the surface of the second part 822 facing the first cavity 812 along the thickness direction Z of the cover, the recess 103 can provide space for the second opening 101 of the first insulating member 10 to avoid the second part 822 which is closer to the electrode assembly 9 than the first part 821, reducing the possibility of the first insulating member 10 contacting the second part 822, thereby reducing the possibility of the first insulating member 10 colliding with the second part 822 and the housing 81 at the connection point, which is beneficial to improving the reliability of the connection between the cover 82 and the housing 81, improving the reliability of the outer shell 8, and improving the reliability of the battery cell 7.

[0087] In some embodiments, reference Figure 4The battery cell 7 also includes a second insulating member 11. The second insulating member 11 includes a first insulating part 111 and a second insulating part 112 that are connected to each other. The first insulating part 111 is disposed on the side of the first part 821 facing the electrode assembly 9, and the second insulating part 112 is disposed on the side of the second part 822 facing the electrode assembly 9. A first connecting structure 1111 is disposed on the surface of the first insulating part 111 facing the electrode assembly 9. The first connecting structure 1111 is connected to the first insulating member 10. A second connecting structure 1121 is disposed on the surface of the second insulating part 112 facing the electrode assembly 9. The second connecting structure 1121 is connected to the first insulating member 10.

[0088] The second insulating member 11 may be a component with insulating properties, which is disposed on the side of the cover 82 facing the electrode assembly 9. Since the second opening 101 of the first insulating member 10 is disposed facing the cover 82, the second insulating member 11 and the first insulating member 10 may form a structure surrounding the electrode assembly 9 to insulate and isolate the electrode assembly 9 from the housing 8.

[0089] The first insulating part 111 and the second insulating part 112 are two interconnected parts of the second insulating member 11. The first insulating part 111 is disposed on the side of the first part 821 facing the electrode assembly 9, and the second insulating part 112 is disposed on the side of the second part 822 facing the electrode assembly 9.

[0090] The first connecting structure 1111 may be a structure provided on the first insulating portion 111 for connecting with the first insulating member 10. The first connecting structure 1111 is provided on the surface of the first insulating portion 111 facing the electrode assembly 9, and protrudes from the surface of the first insulating portion 111 facing the electrode assembly 9 in the direction of the electrode assembly 9, so that the first connecting portion can be easily connected to the first insulating member 10 located on the side of the first insulating portion 111 facing the electrode assembly 9.

[0091] For example, the first connecting structure 1111 and the first insulating member 10 can be bonded together with adhesive, making the connection process of the first connecting structure 1111 and the first insulating member 10 more convenient; the first connecting structure 1111 and the first insulating member 10 can also be connected by melting the materials together, making the connection of the first connecting structure 1111 and the first insulating member 10 more firm and less likely to separate.

[0092] The second connection structure 1121 may be a structure provided on the second insulating portion 112 for connection with the first insulating member 10. The second connection structure 1121 is provided on the surface of the second insulating portion 112 facing the electrode assembly 9, and protrudes from the surface of the second insulating portion 112 facing the electrode assembly 9 in the direction of the electrode assembly 9, so that the second connection portion can be easily connected to the first insulating member 10 located on the side of the second insulating portion 112 facing the electrode assembly 9.

[0093] For example, the second connecting structure 1121 and the first insulating member 10 can be bonded together with adhesive, making the connection process between the second connecting structure 1121 and the first insulating member 10 more convenient; the second connecting structure 1121 and the first insulating member 10 can also be connected by melting the materials together, making the connection between the second connecting structure 1121 and the first insulating member 10 more firm and less likely to detach.

[0094] In some embodiments, reference Figures 5 to 7 At least a portion of the first connecting structure 1111 extends into the second cavity 102 from the second opening 101 and is connected to the wall surface of the first insulating member 10 facing the second cavity 102; at least a portion of the second connecting structure 1121 extends into the second cavity 102 from the second opening 101 and is connected to the wall surface of the first insulating member 10 facing the second cavity 102; along the thickness direction Z of the cover, the dimension of the first connecting structure 1111 extending into the second cavity 102 is greater than the dimension of the second connecting structure 1121 extending into the second cavity 102.

[0095] At least a portion of the first connecting structure 1111 extends from the second opening 101 into the second cavity 102 and is connected to the wall surface of the first insulating member 10 facing the second cavity 102. This can mean that at least a portion of the first connecting structure 1111 extends from the second opening 101 into the second cavity 102, and the first connecting structure 1111 extending into the second cavity 102 is connected to the wall surface of the first insulating member 10 facing the second cavity 102, thereby achieving the connection between the first connecting structure 1111 and the first insulating member 10.

[0096] At least a portion of the second connecting structure 1121 extends from the second opening 101 into the second cavity 102 and is connected to the wall surface of the first insulating member 10 facing the second cavity 102. This can mean that at least a portion of the second connecting structure 1121 extends from the second opening 101 into the second cavity 102, and the second connecting structure 1121 extending into the second cavity 102 is connected to the wall surface of the first insulating member 10 facing the second cavity 102, thereby realizing the connection between the second connecting structure 1121 and the first insulating member 10.

[0097] Along the thickness direction Z of the cover, the dimension by which the first connecting structure 1111 extends into the second cavity 102 is greater than the dimension by which the second connecting structure 1121 extends into the second cavity 102. Specifically, the dimension by which the first connecting structure 1111 extends into the second cavity 102 along the thickness direction Z of the cover is greater than the dimension by which the second connecting structure 1121 extends into the second cavity 102 along the thickness direction Z of the cover. Since the second connecting structure 1121 is connected to the second part 822, which is closer to the electrode assembly 9, via the second insulating part 112, this design allows the end face of the first connecting structure 1111 away from the cover 82 and the end face of the second connecting structure 1121 away from the cover 82 to be closer in the thickness direction Z of the cover. This makes the distances between the first connecting structure 1111 and the electrode assembly 9 more similar, which is beneficial for making the gap width in the battery cell 7 more consistent and improving the uniformity of electrolyte wetting of the electrode assembly 9.

[0098] For example, the end face of the first connecting structure 1111 away from the cover 82 is flush with the end face of the second connecting structure 1121 away from the cover 82.

[0099] The dimension by which the first connecting structure 1111 extends into the second cavity 102 along the thickness direction Z of the cover is larger than the dimension by which the second connecting structure 1121 extends into the second cavity 102 along the thickness direction Z of the cover. This results in the connection force between the second connecting structure 1121 and the first insulating member 10 being less than the connection force between the first connecting structure 1111 and the second insulating member 11, making it easier for the connection between the second connecting structure 1121 and the first insulating member 10 to detach. Since the bottom surface of the recess 103 is positioned opposite to the surface of the second part 822 facing the first cavity 812 along the thickness direction Z of the cover, the second connecting part is connected to the surface of the second part 822 facing the first cavity 812 via the second insulating member 11. The second connecting part extends into the second cavity 102 from the second opening 101 where the recess 103 is located. When the connection between the second connecting structure 1121 and the first insulating member 10 is disengaged, the recess 103 can provide space for the first insulating member 10 to move. Even if the second opening 101 of the first insulating member 10 moves a certain distance toward the second part 822, it is not easy for it to come into contact with the second part 822 or the connection between the second part 822 and the housing 81.

[0100] In some embodiments, reference Figure 8 The bottom surface of the recess 103 is provided with a notch 104, which penetrates the wall of the first insulating member 10 along the thickness direction of the wall of the first insulating member 10. The second connecting structure 1121 is connected to the first insulating member 10 at the notch 104.

[0101] The notch 104 can be a structure formed on the bottom surface of the recess 103 by removing material. By providing the notch 104 on the bottom surface of the recess 103 and extending the notch 104 through the wall of the first insulating member 10 along the thickness direction of the wall, the notch 104 can remove part of the first insulating member 10 from the recess 103, thereby increasing the distance between the first insulating member 10 and the second part 822 at the notch 104. The notch 104 increases the distance between the first insulating member 10 and the second part 822, providing space for the material of the first insulating member 10 near the second opening 101 to avoid the second part 822, which is closer to the electrode assembly 9 than the first part 821. This reduces the possibility of contact between the first insulating member 10 and the second part 822, thereby reducing the possibility of contact between the first insulating member 10 and the second part 822 and the housing 81, which helps to improve the reliability of the connection between the cover 82 and the housing 81.

[0102] By connecting the second connecting structure 1121 to the first insulating member 10 at the notch 104, the notch 104 and the second connecting structure 1121 are positioned opposite each other in the thickness direction Z of the cover, which is beneficial for setting the relative positions of the first insulating member 10 and the second insulating member 11.

[0103] In some embodiments, the first insulating member 10 includes two first walls 113105 disposed opposite to each other along a first direction X and two second walls 114106 disposed opposite to each other along a second direction Y. The second walls 114106 are connected between the two first walls 113105. The area of ​​the surface of the first walls 113105 facing away from the second cavity 102 is greater than the area of ​​the surface of the second walls 114106 facing away from the second cavity 102. The recess 103 is disposed on the first walls 113105. In the thickness direction of the first walls 113105, the central axis of the notch 104, the central axis of the second connecting structure 1121, and the central axis of the recess 103 coincide.

[0104] The first direction X, the second direction Y, and the thickness direction Z of the cover are three mutually perpendicular directions. By making the first insulating member 10 include two first walls 113 105 arranged opposite each other along the first direction X and two second walls 114 106 arranged opposite each other along the second direction Y, and by connecting the second walls 114 106 between the two first walls 113 105, the first insulating member 10 includes four wall structures, which can form a second cavity 102 with a second opening 101.

[0105] By setting the area of ​​the surface of the first wall 113 105 away from the second cavity 102 to be greater than the area of ​​the surface of the second wall 114 106 away from the second cavity 102, the first wall 113 105 is a wall structure with a large surface in the first insulating member 10, and the recess 103 is provided on the wall structure with a large surface in the first insulating member 10.

[0106] In the thickness direction of the first wall 113 105, the central axis of the notch 104 coincides with the central axis of the recess 103. This means that, when viewed along the thickness direction of the first wall 113 105, the central axis of the notch 104, the central axis of the second connecting structure 1121, and the central axis of the recess 103 coincide. This makes the notch 104 and the second connecting structure 1121 both located in the middle of the recess 103, and the notch 104 is symmetrically arranged in the first insulating member 10.

[0107] In some embodiments, continue to refer to Figure 8 In the second direction Y, the size of the notch 104 is E, the size of the recess 103 is F, and 25% ≤ E / F ≤ 100%.

[0108] By setting the dimension of the notch 104 in the second direction Y to E, setting the dimension of the recess 103 in the second direction Y to F, and setting the relationship between the dimension E of the notch 104 in the second direction Y and the dimension F of the recess 103 in the second direction Y to 25% ≤ E / F ≤ 100%, the notch 104 can significantly increase the area with a gap between the first insulating member 10 and the second part 822 in the second direction Y. This can better avoid the second part 822, which is closer to the electrode assembly 9 than the first part 821, and reduce the possibility of contact between the first insulating member 10 and the second part 822 and the housing 81.

[0109] In some embodiments, 30% ≤ E / F ≤ 100%.

[0110] The relationship between the dimension E of the notch 104 in the second direction Y and the dimension F of the recess 103 in the second direction Y is set to 25% ≤ E / F ≤ 100%. For example, E / F can be 60%, 50%, or 80%, so that the notch 104 can significantly increase the area between the first insulating member 10 and the second part 822 in the second direction Y, which can better avoid the second part 822, which is closer to the electrode assembly 9 than the first part 821, and reduce the possibility of contact between the first insulating member 10 and the second part 822 and the housing 81.

[0111] In some embodiments, along the orientation of the second opening 101, the bottom surface of the notch 104 is closer to the second part 822 than the surface of the second connection structure 1121 that is away from the second insulating part 112.

[0112] With respect to the orientation of the second opening 101, by making the bottom surface of the notch 104 closer to the second part 822 than the surface of the second connecting structure 1121 that is away from the second insulating part 112, the second connecting structure 1121 extends into the second cavity 102 at the second opening 101 with the notch 104, so that the second connecting structure 1121 can be connected to the wall surface of the first insulating member 10 facing the second cavity 102 at the notch 104.

[0113] In some embodiments, along the orientation of the second opening 101, the distance between the bottom surface of the notch 104 and the surface of the second connecting structure 1121 facing away from the second insulating portion 112 is set to L, where L ≥ 0.3 mm.

[0114] Along the orientation of the second opening 101, by setting the range L of the distance between the bottom surface of the notch 104 and the surface of the second connecting structure 1121 away from the second insulating part 112 to L≥0.3mm, the second connecting structure 1121 has sufficient connection size with the wall surface of the first insulating member 10 facing the second cavity 102 at the notch 104, which helps to improve the connection force between the second connecting structure 1121 and the first insulating member 10 at the notch 104 and reduce the possibility of the second connecting structure 1121 and the first insulating member 10 detaching.

[0115] In some embodiments, 0.5mm ≤ L ≤ 7mm.

[0116] By setting the range L of the distance between the bottom surface of the notch 104 and the surface of the second connecting structure 1121 facing away from the second insulating part 112 in the orientation of the second opening 101 to 0.5mm≤L≤7mm, for example, L can be 2mm, 4mm or 6mm, not only is there sufficient connection size between the second connecting structure 1121 and the wall surface of the first insulating member 10 facing the second cavity 102 at the notch 104, which helps to improve the connection force between the second connecting structure 1121 and the first insulating member 10 at the notch 104, but also the size of the second connecting structure 1121 extending into the second cavity 102 at the notch 104 is not too large, which would affect the waste of space inside the battery cell 7.

[0117] In some embodiments, the connection between the bottom surface of the recess 103 and the end face where the second opening 101 is located is provided with a rounded corner, and the connection between the bottom surface of the notch 104 and the bottom surface of the recess 103 is provided with a rounded corner.

[0118] By providing rounded corners at the connection between the bottom surface of the recess 103 and the end face where the second opening 101 is located, and at the connection between the bottom surface of the notch 104 and the bottom surface of the recess 103, it is not easy for sharp corners to form at the connection between the bottom surface of the recess 103 and the end face where the second opening 101 is located, and it is not easy for sharp corners to form at the connection between the bottom surface of the notch 104 and the bottom surface of the recess 103. This reduces the possibility of the first insulating component 10 scratching the electrode assembly 9, the outer casing 8, and other components, which is beneficial to improving the reliability of the battery cell 7.

[0119] In some embodiments, the first insulating member 10 includes two first walls 113 105 disposed opposite to each other along a first direction X and two second walls 114 106 disposed opposite to each other along a second direction Y. The second walls 114 106 are connected between the two first walls 113 105. The first direction X, the second direction Y and the thickness direction Z of the cover are perpendicular to each other. The surface area of ​​the first wall 113 105 facing away from the second cavity 102 is larger than the surface area of ​​the second wall 114 106 facing away from the second cavity 102. A recess 103 is disposed on the first wall 113 105. In the thickness direction of the first wall 113 105, the central axis of the recess 103 coincides with the central axis of the first insulating member 10.

[0120] The first direction X, the second direction Y, and the thickness direction Z of the cover are three mutually perpendicular directions. By making the first insulating member 10 include two first walls 113 105 arranged opposite each other along the first direction X and two second walls 114 106 arranged opposite each other along the second direction Y, and by connecting the second walls 114 106 between the two first walls 113 105, the first insulating member 10 includes four wall structures, which can form a second cavity 102 with a second opening 101.

[0121] By setting the area of ​​the surface of the first wall 113 105 away from the second cavity 102 to be greater than the area of ​​the surface of the second wall 114 106 away from the second cavity 102, the first wall 113 105 is a wall structure with a large surface in the first insulating member 10, and the recess 103 is provided on the wall structure with a large surface in the first insulating member 10.

[0122] In the thickness direction of the first wall 113 105, the central axis of the recess 103 coincides with the central axis of the first insulating member 10. This makes the recess 103 located in the middle of the first wall 113 105, which is beneficial to make the structure of the first insulating member 10 and the second insulating member 11 symmetrical.

[0123] For example, when viewed along the thickness direction of the first wall 113 105, the central axis of the cover 82, the central axis of the second part 822, the central axis of the recess 103, and the central axis of the second connecting structure 1121 coincide with the central axis of the first insulating member 10, making the battery cell 7 a symmetrical structure.

[0124] In some embodiments, the battery cell 7 further includes an electrode terminal 12, which is disposed on the second part 822 and electrically connected to the electrode assembly 9.

[0125] Since the second part 822 is closer to the electrode assembly 9 than the first part 821, by placing the electrode terminal 12 on the second part 822, the distance between the electrode terminal 12 and the electrode assembly 9 is closer, which helps to shorten the device used to electrically connect the electrode terminal 12 and the electrode assembly 9, and helps to reduce the cost of the battery cell 7.

[0126] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided by the above-described technical solution.

[0127] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, and the battery device 2 is used to provide electrical energy.

[0128] Some embodiments of this application provide a battery cell 7, which includes a housing 8, an electrode assembly 9, a first insulating member 10, and a second insulating member 11. The housing 8 has a shell 81 forming a first cavity 812 with a first opening 811. A cover 82 covers the first opening 811, and the electrode assembly 9 is located in the first cavity 812. A second portion 822 in the cover 82 is closer to the electrode assembly 9 than the first portion 821. A first insulating portion 111 in the second insulating member 11 is disposed on the side of the first portion 821 facing the electrode assembly 9, and a second insulating portion 112 is disposed on the side of the second insulating member 11 facing the electrode assembly 9. On one side of the electrode assembly 9, a first connecting structure 1111 is provided on the surface of the first insulating part 111 facing the electrode assembly 9, and a second connecting structure 1121 is provided on the surface of the second insulating part 112 facing the electrode assembly 9. The first insulating member 10 forms a second cavity 102 with a second opening 101. The electrode assembly 9 is located in the second cavity 102. The second opening 101 is provided facing the cover 82. The end face where the second opening 101 is located is recessed inward to form a recess 103 that penetrates the wall of the first insulating member 10. The bottom face of the recess 103 is recessed inward to form a notch 104 that penetrates the wall of the first insulating member 10. The first insulating member 10 includes two first walls 113105 disposed opposite to each other along the first direction X and two second walls 114106 disposed opposite to each other along the second direction Y. The second walls 114106 are connected between the two first walls 113105. The first direction X, the second direction Y and the thickness direction Z of the cover are perpendicular to each other. The surface area of ​​the first wall 113105 facing away from the second cavity 102 is larger than the surface area of ​​the second wall 114106 facing away from the second cavity 102. The recess 103 is disposed on the first wall 113105. In the thickness direction of the first wall 113105, the central axis of the notch 104, the central axis of the second connecting structure 1121 and the central axis of the recess 103 coincide.

[0129] In the above structure, since the first insulating member 10 is recessed inward at the end where the second opening 101 is located to form a recess 103 that penetrates the wall of the second insulating member 11 along the thickness direction of the wall of the second insulating member 11, and the bottom surface of the recess 103 is disposed opposite to the surface of the second part 822 facing the first cavity 812 along the thickness direction Z of the cover, the recess 103 can provide space for the second opening 101 of the first insulating member 10 to avoid the second part 822 which is closer to the electrode assembly 9 than the first part 821, reducing the possibility of the first insulating member 10 contacting the second part 822, thereby reducing the possibility of the first insulating member 10 colliding with the second part 822 and the housing 81 at the connection point, which is beneficial to improving the reliability of the connection between the cover 82 and the housing 81, improving the reliability of the outer shell 8, and improving the reliability of the battery cell 7.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; The housing includes a shell and a cover, the shell forming a first cavity with a first opening, the cover closing the first opening, and the electrode assembly located in the first cavity; The cover includes a first part and a second part that are connected to each other, with the second part being closer to the electrode assembly than the first part; A first insulating element is located in the first cavity. The first insulating element forms a second cavity with a second opening. The electrode assembly is located in the second cavity. The second opening is disposed facing the cover. The end face where the second opening is located is recessed inward to form a recess. The recess penetrates the wall of the first insulating element along the thickness direction of the wall. Along the thickness direction of the cover, the bottom surface of the recess is opposite to the surface of the second part facing the first cavity.

2. The battery cell according to claim 1, characterized in that, The battery cell further includes a second insulating member, which includes a first insulating portion and a second insulating portion connected to each other. The first insulating portion is disposed on the side of the first portion facing the electrode assembly, and the second insulating portion is disposed on the side of the second portion facing the electrode assembly. A first connecting structure is disposed on the surface of the first insulating portion facing the electrode assembly, and the first connecting structure is connected to the first insulating member. A second connecting structure is disposed on the surface of the second insulating portion facing the electrode assembly, and the second connecting structure is connected to the first insulating member.

3. The battery cell according to claim 2, characterized in that, At least a portion of the first connecting structure extends into the second cavity from the second opening and is connected to the wall surface of the first insulating member facing the second cavity; at least a portion of the second connecting structure extends into the second cavity from the second opening and is connected to the wall surface of the first insulating member facing the second cavity; along the thickness direction of the cover, the dimension of the first connecting structure extending into the second cavity is greater than the dimension of the second connecting structure extending into the second cavity.

4. The battery cell according to any one of claims 2-3, characterized in that, The bottom surface of the recess is provided with a notch, which penetrates the wall of the first insulating member along the thickness direction of the first insulating member. The second connecting structure is connected to the first insulating member at the notch.

5. The battery cell according to claim 4, characterized in that, The first insulating member includes two first walls disposed opposite each other along a first direction and two second walls disposed opposite each other along a second direction. The second walls are connected between the two first walls. The first direction, the second direction and the thickness direction of the cover are perpendicular to each other. The area of ​​the surface of the first wall facing away from the second cavity is greater than the area of ​​the surface of the second wall facing away from the second cavity. The recess is disposed on the first wall. In the thickness direction of the first wall, the central axis of the notch, the central axis of the second connecting structure and the central axis of the recess coincide.

6. The battery cell according to claim 5, characterized in that, In the second direction, the size of the notch is E, the size of the recess is F, and 25% ≤ E / F ≤ 100%.

7. The battery cell according to claim 6, characterized in that, 30% ≤ E / F ≤ 100%.

8. The battery cell according to any one of claims 5-7, characterized in that, Along the orientation of the second opening, the bottom surface of the notch is closer to the second part than the surface of the second connecting structure that is away from the second insulating part.

9. The battery cell according to claim 8, characterized in that, Along the orientation of the second opening, the distance between the bottom surface of the notch and the surface of the second connecting structure opposite to the second insulating part is set to L, where L≥0.3mm.

10. The battery cell according to claim 9, characterized in that, 0.5mm≤L≤7mm.

11. The battery cell according to any one of claims 4-10, characterized in that, The bottom surface of the recess is provided with a rounded corner at the connection between the end face where the second opening is located, and the bottom surface of the notch is provided with a rounded corner at the connection between the bottom surface of the recess.

12. The battery cell according to any one of claims 1-11, characterized in that, The first insulating member includes two first walls disposed opposite each other along a first direction and two second walls disposed opposite each other along a second direction. The second walls are connected between the two first walls. The first direction, the second direction and the thickness direction of the cover are perpendicular to each other. The area of ​​the surface of the first wall facing away from the second cavity is greater than the area of ​​the surface of the second wall facing away from the second cavity. The recess is disposed on the first wall. In the thickness direction of the first wall, the central axis of the recess coincides with the central axis of the first insulating member.

13. The battery cell according to any one of claims 1-12, characterized in that, The battery cell also includes an electrode terminal, which is disposed in the second part and electrically connected to the electrode assembly.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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