Battery cell, battery device, and electric device

Abstract

This application discloses a battery cell, a battery device, and an electrical appliance. The battery cell includes an electrode assembly, a housing, electrode terminals, and an insulating member. The electrode assembly is housed within the housing, which includes a first wall and a second wall that intersect each other. The first wall is located on one side of the electrode assembly along a first direction, and the second wall is located on one side of the electrode assembly along a second direction. The electrode terminals are disposed on the second wall. The insulating member covers the side of the housing away from the electrode assembly and is connected to the first and second walls. The insulating member includes an insulating body and a protrusion. The insulating body is at least partially disposed on the first and second walls, and the protrusion is at least partially disposed on the second wall and connected to the insulating body. At least a portion of the protrusion protrudes from the edge of the insulating body along the first direction. The electrode terminals and the protrusion are spaced apart along a third direction. This application is advantageous in increasing the connection area between the insulating member and the second wall, improving connection stability, mitigating the problem of insulating member warping, and improving the reliability of the battery cell.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the reliability of individual battery cells is a key research direction. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical appliance, which helps to improve the reliability of the battery cell.

[0005] According to a first aspect of this application, a battery cell is provided, comprising an electrode assembly, a housing, electrode terminals, and an insulating member. The electrode assembly is housed within the housing, which includes a first wall and a second wall that intersect each other. The first wall is located on one side of the electrode assembly along a first direction, and the second wall is located on one side of the electrode assembly along a second direction. The electrode terminals are disposed on the second wall. The insulating member covers the side of the housing away from the electrode assembly and is connected to the first and second walls. The insulating member includes an insulating body and a protrusion. At least a portion of the insulating body is disposed on the first and second walls, and the protrusion is disposed on the second wall and connected to the insulating body. At least a portion of the protrusion protrudes from the edge of the insulating body along the first direction. The electrode terminals and the protrusion are spaced apart along a third direction, with the first, second, and third directions perpendicular to each other.

[0006] In this embodiment, the protrusion and the electrode terminal are spaced apart along a third direction. In the first direction, this helps to reduce the influence and limitation of the electrode terminal on the size of the protrusion protruding from the insulating body. By increasing the size of the protrusion protruding from the insulating body, the connection area between the insulating component and the second wall can be increased, thereby improving the connection stability between the insulating component and the second wall, improving the problem of the insulating component lifting, and improving the insulation protection effect of the insulating component, thus improving the reliability of the battery cell.

[0007] In some embodiments, the orthographic projection of the protrusion does not overlap with the orthographic projection of the electrode terminal in the same plane perpendicular to the first direction. The size of the protrusion protruding from the insulating body is not limited by the electrode terminal, which helps to increase the connection area between the insulating element and the second wall, improve the connection stability between the insulating element and the second wall, and alleviate the problem of the insulating element warping.

[0008] In some embodiments, the orthographic projection of the protrusion and the orthographic projection of the electrode terminal partially overlap in the same plane perpendicular to the third direction. A larger dimension of the protrusion along the first direction is beneficial for increasing the connection area between the protrusion and the second wall, thus mitigating the problem of the insulating element warping from the second wall.

[0009] In some embodiments, the second wall includes a first portion, a second portion, and a bend. In a second direction, the second portion is closer to the electrode assembly than the first portion, and the bend connects the first and second portions. Electrode terminals are disposed on either the first or second portion. A protrusion is connected to at least one of the first portion, the second portion, and the bend. This improves the flexibility in positioning the protrusion, allowing it to constrain the portion of the insulating body near the protrusion and further reducing the risk of the insulating body lifting off the second wall.

[0010] In some embodiments, the protrusion is at least partially connected to the region of the second portion near the bend. This increases the connection area between the insulating member and the second portion near the bend, improving the connection stability between the insulating member and the second portion and reducing the risk of the insulating member lifting at the connection point to the second portion.

[0011] In some embodiments, electrode terminals are disposed in the second portion. The portion of the electrode terminals protruding from the outer surface of the second portion can share space in the second direction with a portion of the housing, which helps to save space and increase the energy density of the battery cell.

[0012] In some embodiments, the electrode assembly includes a body portion and a tab, the tab extending from an end face of the body portion toward a second wall; a first recess is formed on the side of the second wall facing the electrode assembly, the first recess being recessed relative to the surface of the second portion toward the electrode assembly, the bottom surface of the first recess corresponding to the first portion; in the same plane perpendicular to the second direction, the orthographic projection of the tab at least partially overlaps with the orthographic projection of the first recess. The first recess can provide a receiving space and / or a buffer space for the tab in the second direction, reducing the squeezing force on the tab and lowering the risk of tab breakage.

[0013] In some embodiments, at least a portion of the tab is accommodated in a first recess. This reduces the additional space occupied by the tab within the housing, which is beneficial for increasing the size of the main body and improving the energy density of the battery cell.

[0014] In some embodiments, the second wall includes two first portions and two bends, with the two ends of the second portions respectively connected to the two first portions via the two bends, and the second portions and the two bends defining a second recess, the second recess being recessed relative to the surface of the first portions away from the electrode assembly; or, the second wall includes two second portions and two bends, with the two ends of the first portions respectively connected to the two second portions via the two bends.

[0015] In some embodiments, the insulating body includes a first insulating portion and a second insulating portion, the first insulating portion being connected to a first wall, the second insulating portion being connected to the first insulating portion and bent relative to the first insulating portion, and the second insulating portion being connected to a second wall; at least a portion of the protrusion protrudes from the edge of the second insulating portion away from the first insulating portion and is connected to the second wall.

[0016] In some embodiments, the housing includes two first walls, which are respectively located on both sides of the electrode assembly along a first direction; the insulating member includes two first insulating portions and two second insulating portions, the two first insulating portions being respectively connected to the two first walls; the two second insulating portions are respectively connected to the two first insulating portions and are bent relative to the two first insulating portions, and are spaced apart along the first direction; the insulating member includes a plurality of protrusions, and each second insulating portion is connected to at least one protrusion. Each second insulating portion is connected to at least one protrusion, and the portion of each second insulating portion near the protrusion connected to it is constrained by the protrusion, which helps to reduce the risk of each second insulating portion lifting.

[0017] In some embodiments, each second insulating portion is connected to a plurality of protrusions; the plurality of protrusions connected to one second insulating portion and the plurality of protrusions connected to another second insulating portion are arranged in a one-to-one correspondence along a first direction. On the one hand, by providing protrusions at locations where both second insulating portions are prone to warping, the risk of warping of each second insulating portion is reduced. On the other hand, while keeping the size of the protrusions from the second insulating portions constant, the possibility of stacking and connecting two corresponding protrusions respectively connected to the two second insulating portions is increased, which is beneficial to further reduce the risk of warping of the second insulating portions while controlling costs.

[0018] In some embodiments, the protrusion connected to one second insulating portion is connected to at least one of another second insulating portion, a protrusion connected to another second insulating portion, and a first insulating portion connected to another second insulating portion. This helps to enhance the connection strength of the protrusion and further reduce the risk of the insulating component lifting.

[0019] In some embodiments, the first insulating portion, the second insulating portion, and the protrusion are integrally formed. This simplifies the assembly process of the insulating component and the housing, and improves assembly efficiency.

[0020] In some embodiments, the second insulating portion and the protrusion are separate structures, with one part of the protrusion connected to the second insulating portion and the other part connected to the second wall. This increases the connection area between the second insulating portion and the protrusion, enhancing the restraining effect of the protrusion on the second insulating portion, thereby improving the anti-lifting effect on the second insulating portion.

[0021] In some embodiments, the orthographic projection of the second insulating portion and the orthographic projection of the electrode terminal do not overlap in the same plane perpendicular to the second direction. The second insulating portion not covering the electrode terminal facilitates the electrical connection between the electrode terminal and the busbar, and also reduces the risk of the second insulating portion warping.

[0022] In some embodiments, the housing includes a third wall located on one side of the electrode assembly along a third direction and connected to the first and second walls; the insulating member includes a third insulating portion and a fourth insulating portion, the third insulating portion being connected to the first insulating portion and bent relative to the first insulating portion, the third insulating portion being connected to the third wall, the fourth insulating portion being connected to the third insulating portion and bent relative to the third insulating portion, and the fourth insulating portion being connected to the second wall. This facilitates increasing the area of ​​the housing covered by the insulating member, thereby improving the insulating protection effect of the insulating member.

[0023] In some embodiments, the housing includes two third walls, which are respectively located on both sides of the electrode assembly along a third direction; the insulating member includes two third insulating portions, which are respectively connected to the two third walls, and one of the third insulating portions includes a first insulating layer and a second insulating layer. Along the third direction, at least a portion of the first insulating layer and at least a portion of the second insulating layer are stacked and interconnected. On the one hand, this is beneficial to improve the covering effect of the insulating member on the third wall and improve problems such as curling and lifting at the beginning and end of the insulating member on the third wall. On the other hand, it can also improve the stability of the insulating member covering the housing and reduce the risk of the insulating member loosening.

[0024] In some embodiments, the protrusion extends beyond the insulating body by a dimension of L1, where L1 ≤ 30 mm, and optionally, 2 mm ≤ L1 ≤ 20 mm. This achieves a balance between reducing the material cost of the insulating component and minimizing the risk of warping.

[0025] In some embodiments, the size of the protrusion along the third direction is L2, where L2 ≥ 1 mm. Therefore, the area of ​​the protrusion can be increased by utilizing the space of the second wall in the third direction, thereby increasing the connection area between the protrusion and the second wall, improving the connection stability, reducing the risk of the protrusion itself lifting, and thus improving the anti-lifting effect on the insulating component.

[0026] In some embodiments, the insulating element is bonded to the outer surface of the housing, and the peel strength between the insulating element and the housing is 200 N / m to 1000 N / m. A high peel strength between the insulating element and the housing reduces the risk of the insulating element peeling off the housing, thus improving reliability.

[0027] In some embodiments, the battery cell includes a pressure relief mechanism disposed on the second wall; the protrusion and the pressure relief mechanism are spaced apart along a third direction. This helps to reduce the influence and limitation of the pressure relief mechanism on the size of the protrusion extending from the insulating body along the first direction, increases the connection area between the protrusion and the second wall, improves the connection stability between the protrusion and the second wall, and reduces the risk of the insulating component lifting off the second wall.

[0028] In some embodiments, along a third direction, at least one protrusion is connected to the region of the second wall located between the electrode terminal and the pressure relief mechanism. This increases the connection area between the insulating member and the region of the second wall located between the electrode terminal and the pressure relief mechanism, reducing the risk of warping of the portion of the insulating body corresponding to the pressure relief mechanism and the portion of the insulating body corresponding to the electrode terminal.

[0029] In some embodiments, the second wall is provided with injection holes, and the protrusions and injection holes are spaced apart along a third direction. This helps to reduce the influence and limitation of the injection holes on the size of the protrusions from the insulating body, increase the connection area between the protrusions and the second wall, improve connection stability, and reduce the risk of insulation component warping.

[0030] In some embodiments, the battery cell includes a protective member. Along a second direction, at least a portion of the insulator connected to the second wall is located between the protective member and the second wall. The protective member is connected to the second wall and the insulator. The protective member has clearance holes through which electrode terminals are exposed on the side of the protective member opposite to the second wall. The protective member can restrict the at least portion of the insulator connected to the second wall, which helps to further reduce the risk of the insulator lifting off the second wall. The protective member also protects the insulator and the second wall, reducing the risk of wear on the insulator and improving the insulation protection effect.

[0031] According to a second aspect of this application, this application also provides a battery device comprising a battery cell provided in any of the embodiments.

[0032] According to a third aspect of this application, this application also provides an electrical device that includes a battery device provided in any embodiment, the battery device being used to provide electrical energy. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0035] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0036] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0037] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0038] Figure 5 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application.

[0039] Figure 6 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0040] Figure 7 This is a top view schematic diagram of a battery cell provided in some embodiments of this application.

[0041] Figure 8 It is along Figure 7 The cross-sectional view taken from direction AA in the middle.

[0042] Figure 9 yes Figure 8 A magnified structural diagram of region B in the middle.

[0043] Figure 10 yes Figure 8 A magnified structural diagram of region C in the middle.

[0044] Figure 11 This is a cross-sectional view of a battery cell provided in other embodiments of this application.

[0045] Figure 12 This is an exploded structural diagram of the insulating component of a battery cell provided in other embodiments of this application.

[0046] The attached figures are labeled as follows:

[0047] Vehicle 1, battery unit 2, controller 3, motor 4;

[0048] Box 5, first box section 5a, second box section 5b, and accommodating space 5c;

[0049] Battery cell 6, electrode assembly 10, main body 11, tab 12, outer shell 20, housing 21, opening 211, end cap 22, first wall 23, second wall 24, first part 241, second surface 241a, second part 242, first surface 242a, bending part 243, first recess 244, second recess 245, liquid injection hole 246, third wall 25, fourth wall 26, electrode terminal 30, insulating member 40, insulating body 46, first insulating part 41, second insulating part 42, end face 42a, protrusion 43, third insulating part 44, first insulating layer 441, second insulating layer 442, fourth insulating part 45, pressure relief mechanism 50, protective member 60, clearance hole 61, first direction X, second direction Y, third direction Z. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0052] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "adhesion" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0056] In this application, "multiple" means two or more (including two).

[0057] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0058] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0059] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0060] A typical battery cell includes an electrode assembly, a housing, and electrode terminals. The electrode assembly is housed within the housing, and the electrode terminals are located within the housing. The housing encapsulates the electrode assembly and electrolyte components. The electrode assembly includes tabs, which are electrically connected to the electrode terminals via adapters or directly to the electrode terminals. The electrode terminals are used to electrically connect the electrode assembly to external circuitry within the battery cell to enable charging or discharging of the battery cell.

[0061] 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.

[0062] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0064] In some implementations, the separator is positioned between the positive and negative electrodes.

[0065] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0066] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0067] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0068] In some embodiments, the electrode assembly has a stacked structure.

[0069] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0071] A battery device typically includes a housing for encapsulating one or more individual battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the individual battery cells.

[0072] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties. The battery cell assembly can be housed within a housing by fixing the battery module within the housing. As an example, the housing can include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, creating a closed space inside the housing to house the battery cell assembly.

[0073] 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.

[0074] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0075] After a battery cell is assembled, an insulating layer is typically wrapped around its outer casing. This insulating layer serves to insulate and protect the casing, reducing the risk of short circuits between the casing and external structures, and minimizing the possibility of casing wear and scratches. The insulating layer covers one wall of the casing and folds towards the wall where the electrode terminals are located. However, due to the limited distance between the electrode terminals and the edge of the wall, the folded portion of the insulating layer towards that wall is usually small, making it prone to warping. During the stacking and assembly of multiple battery cells, the warped portion of the insulating layer is susceptible to pressure and misalignment, leading to insulation failure. Furthermore, the warped portion of the insulating layer is often sticky, easily attracting metallic foreign objects and creating potential insulation failure issues.

[0076] In view of this, the present application provides a technical solution that increases the size of the portion of the insulating component folded into the wall in the area offset from the electrode terminals, thereby increasing the connection area between the insulating component and the wall. This helps to improve the problem of the insulating component warping, enhances the insulation protection effect of the insulating component, and thus improves the reliability of the battery cell.

[0077] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0078] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0079] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0080] Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. (Refer to...) Figure 1Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. 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, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0081] 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.

[0082] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2 The battery device 2 includes a housing 5 and a battery cell 6, with the battery cell 6 housed within the housing 5. The housing 5 provides a space for the battery cell 6 and 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, together defining a space 5c for accommodating the battery cell 6. The second housing portion 5b may be a hollow structure with one open end, while the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b so that the first housing portion 5a and the second housing portion 5b together define the space 5c. Alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one open side, with the open side of the first housing portion 5a overlapping the open side of the second housing portion 5b. Of course, the box 5 formed by the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0083] 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.

[0084] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0085] In the battery device 2, there can be multiple battery cells 6, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel configurations. Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 can also consist of multiple battery cells 6 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 5. The battery device 2 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 6.

[0086] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0087] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. (Refer to...) Figure 3 The battery cell 6 includes an electrode assembly 10 and a housing 20, with the electrode assembly 10 disposed inside the housing 20.

[0088] The outer casing 20 is used to encapsulate the electrode assembly 10 and electrolyte components. The outer casing 20 can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0089] In some embodiments, the housing 20 is a hollow structure, with an internal space for accommodating the electrode assembly 10 and the electrolyte. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 has a cuboid structure, a cuboid housing can be selected.

[0090] The outer casing 20 can be made of various materials, such as metal or plastic. Optionally, the outer casing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the outer casing 20 can be a steel casing, aluminum casing, plastic casing (such as polypropylene), composite metal casing (such as copper-aluminum composite casing), or aluminum-plastic film, etc.

[0091] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening 211 and the end cap 22 for closing the opening 211.

[0092] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0093] The housing 21 and the end cap 22 can be separate components. For example, an opening 211 can be provided on the housing 21, and the end cap 22 can be used to close the opening 211 to form an internal cavity for the battery cell 6.

[0094] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

[0095] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0096] The housing 21 may have an opening 211 at one end or at both ends. For example, the housing 21 may have an opening 211 on one side, with an end cap 22 covering the opening 211 of the housing 21. Alternatively, the housing 21 may have openings 211 on both sides, with two end caps 22 covering the two openings 211 of the housing 21 respectively.

[0097] Figure 4 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application. Figure 5 These are schematic diagrams of the structure of a battery cell provided in other embodiments of this application. Figure 6 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application. Figure 7 This is a top view schematic diagram of a single battery cell provided in some embodiments of this application. Figure 8 It is along Figure 7 The sectional view taken from direction AA in the middle. Figure 9 yes Figure 8 A magnified structural diagram of region B in the middle. Figure 10 yes Figure 8 A magnified structural diagram of region C in the middle. Figure 11 This is a cross-sectional view of a battery cell provided in other embodiments of this application. Figure 12 This is an exploded structural diagram of the insulating component of a battery cell provided in other embodiments of this application.

[0098] Reference Figures 3 to 12This application provides a battery cell 6, which includes an electrode assembly 10, a housing 20, electrode terminals 30, and an insulating member 40. The electrode assembly 10 is housed within the housing 20. The housing 20 includes a first wall 23 and a second wall 24 that intersect each other. The first wall 23 is located on one side of the electrode assembly 10 along a first direction X, and the second wall 24 is located on one side of the electrode assembly 10 along a second direction Y. The electrode terminals 30 are disposed on the second wall 24. The insulating member 40 covers the side of the housing 20 away from the electrode assembly 10 and is connected to the first wall 23 and the second wall 24. The insulating member 40 includes an insulating body 46 and a protrusion 43. At least a portion of the insulating body 46 is disposed on the first wall 23 and the second wall 24, and the protrusion 43 is disposed on the second wall 24 and connected to the insulating body 46. At least a portion of the protrusion 43 protrudes from the edge of the insulating body 46 along the first direction X. The electrode terminals 30 and the protrusion 43 are spaced apart along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Optionally, the first wall 23 is a wall portion with a larger area of ​​the outer casing 20. The first wall 23 can be one of the walls of the casing 21, or it can be an end cap 22. Optionally, in Figure 4 In the embodiment shown, the first wall 23 is one of the wall portions of the housing 21.

[0099] The second wall 24 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 4 In the embodiment shown, the second wall 24 is an end cap 22.

[0100] Optionally, at least a portion of the electrode terminal 30 protrudes beyond the outer surface of the second wall 24. Alternatively, the electrode terminal 30 does not extend beyond the outer surface of the second wall 24 in the direction of the electrode assembly 10 toward the second wall 24.

[0101] The side of the housing 20 away from the electrode assembly 10 can be the exterior of the housing 20. The insulating member 40 covering the side of the housing 20 away from the electrode assembly 10 can mean that the insulating member 40 wraps around and covers at least a portion of the outer surface of the housing 20. The insulating member 40 may cover at least a portion of the outer surface of each wall portion of the housing 20, or it may only cover at least a portion of the outer surface of a portion of the walls of the housing 20.

[0102] The insulating element 40 can be attached to the first wall 23 and the second wall 24 by bonding, heat fusion or other suitable means.

[0103] In the embodiments of this application, "adhesion" can be achieved by adhesive bonding or by bonding using the adhesive properties of the components themselves.

[0104] In some examples, a portion of the insulating body 46 is disposed on the first wall 23, and another portion of the insulating body 46 is disposed on the second wall 24. In other examples, the insulating body 46, in addition to the portions disposed on the first wall 23 and the second wall 24, also includes portions disposed on other wall portions of the housing 20.

[0105] In some examples, the protrusion 43 protrudes entirely from the edge of the insulating body 46 along the first direction X. In other examples, only a portion of the protrusion 43 protrudes from the edge of the insulating body 46 along the first direction X, and another portion of the protrusion 43 may, for example, be stacked and connected to a portion of the insulating body 46 along the second direction Y.

[0106] There can be one or more protrusions 43.

[0107] In some examples, the protrusion 43 is a single-layer structure. In other examples, the protrusion 43 is a multi-layer structure stacked along the second direction Y. When the protrusion 43 is in a folded state of multi-layer stacking, the protrusion 43 and the electrode terminal 30 are spaced apart along the third direction Z. When the protrusion 43 is in an unfolded state of flattening its multi-layer structure, the protrusion 43 and the electrode terminal 30 are spaced apart along the third direction Z.

[0108] The fact that the protrusion 43 and the electrode terminal 30 are spaced apart along the third direction Z means that the edge of the protrusion 43 near the electrode terminal 30 is spaced apart from the electrode terminal 30 along the third direction Z. In some examples, the protrusion 43 and the electrode terminal 30 are completely offset along the first direction X. In other examples, the protrusion 43 and the electrode terminal 30 are partially offset along the first direction X, and in the same plane perpendicular to the second direction Y, a portion of the orthographic projection of the protrusion 43 and a portion of the orthographic projection of the electrode terminal 30 are opposite each other along the first direction X.

[0109] The protrusion 43 and the electrode terminal 30 are spaced apart along the third direction Z. In the first direction X, this helps to reduce the influence and limitation of the electrode terminal 30 on the size of the protrusion 43 protruding from the insulating body 46. By increasing the size of the protrusion 43 protruding from the insulating body 46, the connection area between the insulating member 40 and the second wall 24 can be increased, thereby improving the connection stability between the insulating member 40 and the second wall 24, improving the problem of the insulating member 40 lifting, and improving the insulation protection effect of the insulating member 40, thereby improving the reliability of the battery cell 6.

[0110] In some embodiments, the orthographic projection of the protrusion 43 does not overlap with the orthographic projection of the electrode terminal 30 in the same plane perpendicular to the first direction X. In other words, the protrusion 43 and the electrode terminal 30 are completely offset along the first direction X. Therefore, the size of the protrusion 43 protruding from the insulating body 46 is not limited by the electrode terminal 30, which helps to increase the connection area between the insulating member 40 and the second wall 24, improve the connection stability between the insulating member 40 and the second wall 24, and alleviate the problem of the insulating member 40 warping.

[0111] In some embodiments, refer to Figures 4 to 7 In the same plane perpendicular to the third direction Z, the orthographic projection of the protrusion 43 and the orthographic projection of the electrode terminal 30 overlap.

[0112] Along the first direction X, at least a portion of the protrusion 43 extends beyond the position of the electrode terminal 30 closest to the insulating body 46 connected to the protrusion 43.

[0113] The larger size of the protrusion 43 along the first direction X is beneficial to increasing the connection area between the protrusion 43 and the second wall 24, and improving the problem of the insulating member 40 lifting off the second wall 24.

[0114] In some embodiments, refer to Figures 4 to 9 The second wall 24 includes a first portion 241, a second portion 242, and a bent portion 243. In the second direction Y, the second portion 242 is closer to the electrode assembly 10 than the first portion 241, and the bent portion 243 connects the first portion 241 and the second portion 242. Electrode terminals 30 are disposed on either the first portion 241 or the second portion 242. A protrusion 43 is connected to at least one of the first portion 241, the second portion 242, and the bent portion 243.

[0115] The bent portion 243 can be bent relative to the first portion 241 in a direction gradually approaching the electrode assembly 10. The bent portion 243 can be bent relative to the second portion 242 in a direction gradually moving away from the electrode assembly 10. The bent portion 243 can extend from the first portion 241 to the second portion 242 in a direction gradually approaching the electrode assembly 10.

[0116] The first part 241 and the second part 242 can be arranged along the third direction Z, and the two ends of the bent part 243 along the third direction Z are respectively connected to the first part 241 and the second part 242.

[0117] The bent portion 243 is inclined relative to the second direction Y and is not parallel to the second direction Y, so that the insulating body 46 is simultaneously connected to the first part 241, the second part 242 and the bent portion 243, which is beneficial to improving the covering effect of the insulating member 40 on the second wall 24.

[0118] There can be one or more protrusions 43.

[0119] The protrusion 43 may be connected only to the first part 241, only to the second part 242, or only to the bend 243. When the size of the protrusion 43 is large, the protrusion 43 may also be connected to any two or three of the first part 241, the second part 242, and the bend 243 at the same time.

[0120] When there are multiple protrusions 43, the multiple protrusions 43 may be connected only to the first part 241, only to the second part 242, or only to the bend 243. The multiple protrusions 43 may also be connected to any two or three of the first part 241, the second part 242, and the bend 243 respectively.

[0121] Since the first portion 241 and the second portion 242 are offset from each other in the second direction Y, the insulating body 46 is more likely to warp off the second wall 24. Therefore, in some embodiments, the insulating body 46 is connected to the first portion 241, the second portion 242, and the bend 243. Connections exist between the insulating body 46 and the first portion 241, between the insulating body 46 and the second portion 242, and between the insulating body 46 and the bend 243. This improves the connection stability between the insulating body 46 and the second wall 24 and reduces the risk of the insulating body 46 warping off the second wall 24.

[0122] The protrusion 43 is connected to at least one of the first part 241, the second part 242 and the bent part 243 by a connection method, which can improve the flexibility of the position setting of the protrusion 43. The protrusion 43 can restrain the part of the insulating body 46 near the protrusion 43, further reducing the risk of the insulating body 46 lifting off the second wall 24.

[0123] In some embodiments, refer to Figure 4 At least a portion of the protrusion 43 is connected to the area of ​​the second portion 242 near the bend 243.

[0124] The protrusion 43 may be integrally connected to the area of ​​the second part 242 near the bend 243, or only a part of the protrusion 43 may be connected to the area of ​​the second part 242 near the bend 243, and the other part of the protrusion 43 may be connected to the bend 243, for example.

[0125] Since the first part 241 and the second part 242 are at least partially offset along the second direction Y, the portion of the insulating member 40 connected to the first part 241 and the portion of the insulating member 40 connected to the bend 243 are misaligned in the second direction Y, and the portion of the insulating member 40 connected to the second part 242 and the portion of the insulating member 40 connected to the bend 243 are also misaligned in the second direction Y. The portion of the insulating member 40 connected to the bend 243 and the portion of the insulating member 40 connected to the second part 242 near the edge of the bend 243 are more prone to warping.

[0126] In this embodiment, at least a portion of the protrusion 43 is connected to the area of ​​the second portion 242 near the bend 243. This increases the connection area between the insulating member 40 and the second portion 242 near the bend 243, improving the connection stability between the insulating member 40 and the second portion 242 and reducing the risk of warping at the connection point. The protrusion 43 also provides a restraining effect on the portion of the insulating body 46 connected to the bend 243, further reducing the risk of warping at this connection point.

[0127] In some embodiments, refer to Figure 4 and Figure 5 At least a portion of the protrusion 43 is connected to the bend 243. This increases the connection area between the insulating member 40 and the bend 243, improves the connection stability between the insulating member 40 and the bend 243, and reduces the risk of warping at the portion of the insulating member 40 connected to the bend 243. The connection between the protrusion 43 and the bend 243 also constrains the portion of the insulating body 46 near the bend 243, further reducing the risk of warping at this portion.

[0128] In some embodiments, refer to Figures 4 to 8 ,as well as Figure 11 Electrode terminal 30 is located in the second part 242.

[0129] At least a portion of the electrode terminal 30 may protrude from the outer surface of the second portion 242.

[0130] Along the direction of the electrode assembly 10 toward the second wall 24, a portion of the electrode terminal 30 may extend beyond the outer surface of the first portion 241. Alternatively, along the direction of the electrode assembly 10 toward the second wall 24, the electrode terminal 30 may not extend beyond the outer surface of the first portion 241.

[0131] Along the second direction Y, the first portion 241 is further away from the electrode assembly 10 than the second portion 242. Along the direction from the electrode assembly 10 to the second wall 24, a portion of the housing 20 may extend beyond the second portion 242. The electrode terminal 30 is disposed on the second portion 242, and the portion of the electrode terminal 30 protruding from the outer surface of the second portion 242 may share space in the second direction Y with a portion of the housing 20, which helps to save space and increase the energy density of the battery cell 6.

[0132] In some embodiments, refer to Figures 8 to 11 The electrode assembly 10 includes a main body 11 and a tab 12, the tab 12 extending from the end face of the main body 11 toward the second wall 24. A first recess 244 is formed on the side of the second wall 24 facing the electrode assembly 10, the first recess 244 being recessed relative to the surface of the second portion 242 toward the electrode assembly 10, and the bottom surface of the first recess 244 corresponding to the first portion 241. In the same plane perpendicular to the second direction Y, the orthographic projection of the tab 12 at least partially overlaps with the orthographic projection of the first recess 244.

[0133] The second portion 242 has a first surface 242a facing the electrode assembly 10, and a first recess 244 is recessed relative to the first surface 242a in a direction away from the electrode assembly 10. The first portion 241 may form the bottom wall of the first recess 244.

[0134] In the same plane perpendicular to the second direction Y, the orthographic projection of the tab 12 may be located within the orthographic projection of the first recess 244, or only a portion of the orthographic projection of the tab 12 may be located within the orthographic projection of the first recess 244.

[0135] The first recess 244 can provide a receiving space and / or buffer space for the tab 12 in the second direction Y, which can reduce the squeezing effect on the tab 12 and reduce the risk of the tab 12 breaking.

[0136] In some embodiments, refer to Figure 8 , Figure 9 and Figure 11 At least a portion of the tab 12 is accommodated in the first recess 244.

[0137] The tab 12 can be entirely housed in the first recess 244, or only a portion of the tab 12 can be housed in the first recess 244. For example, the other portion of the tab 12 can be located on the side of the first recess 244 facing the main body 11.

[0138] In this embodiment, the first recess 244 provides at least a partial accommodating space for the tab 12, which can reduce the extra space occupied by the tab 12 in the housing 20, which is beneficial to increase the size of the main body 11 and improve the energy density of the battery cell 6.

[0139] In some embodiments, refer to Figures 4 to 8 The second wall 24 includes two first portions 241 and two bends 243. The two ends of the second portion 242 are respectively connected to the two first portions 241 by the two bends 243. The second portion 242 and the two bends 243 define a second recess 245, which is recessed relative to the surface of the first portion 241 away from the electrode assembly 10.

[0140] There can be two first recesses 244, and the bottom surfaces of the two first recesses 244 can correspond to the two first parts 241 respectively.

[0141] The two first parts 241 can be arranged along the third direction Z, and the two ends of the second part 242 along the third direction Z are respectively connected to the two first parts 241 through two bends 243.

[0142] The second part 242 and the two bent parts 243 enclose and form the second recess 245. The second part 242 can form the bottom wall of the second recess 245, and the two bent parts 243 can respectively form the two side walls of the second recess 245 along the third direction Z. The second recess 245 is open on both sides along the first direction X.

[0143] The first portion 241 has a second surface 241a away from the electrode assembly 10, and the second recess 245 is recessed relative to the second surface 241a toward the electrode assembly 10.

[0144] Optionally, the two bends 243 are arranged symmetrically.

[0145] Optionally, the electrode terminal 30 is disposed in the second portion 242, and at least a portion of the electrode terminal 30 is accommodated in the second recess 245, which helps to save space of the battery cell 6 along the second direction Y and improve energy density.

[0146] In some embodiments, refer to Figure 11 The second wall 24 includes two second parts 242 and two bends 243. The two ends of the first part 241 are respectively connected to the two second parts 242 through the two bends 243.

[0147] Optionally, there can be two electrode terminals 30, and the two electrode terminals 30 can be respectively located in two second parts 242.

[0148] The two second parts 242 can be arranged along the third direction Z, and the two ends of the first part 241 along the third direction Z are respectively connected to the two second parts 242 through two bends 243.

[0149] The first part 241 and the two bent parts 243 may form a protrusion that protrudes from the surface of the second part 242 facing away from the electrode assembly 10.

[0150] In some embodiments, the insulating body 46 includes a first insulating portion 41 and a second insulating portion 42. The first insulating portion 41 is connected to the first wall 23, the second insulating portion 42 is connected to the first insulating portion 41 and bent relative to the first insulating portion 41, and the second insulating portion 42 is connected to the second wall 24. At least a portion of the protrusion 43 protrudes from the edge of the second insulating portion 42 away from the first insulating portion 41 and is connected to the second wall 24.

[0151] The first insulating portion 41 covers the outer surface of the first wall 23. The second insulating portion 42 is connected to the area of ​​the second wall 24 along the first direction X near the first wall 23 and covers a portion of the outer surface of the second wall 24.

[0152] The second insulating portion 42 is connected to the edge of the first insulating portion 41 along the second direction Y near the second wall 24. The second insulating portion 42 may extend from one end of the second wall 24 along the third direction Z to the other end of the second wall 24 along the third direction Z, so as to cover the outer surface of the second wall 24 at the entire edge near the first wall 23.

[0153] The dimension of the second insulating portion 42 along the first direction X can be the width of the second insulating portion 42. The second insulating portion 42 can be a structure with equal width or a structure with unequal width.

[0154] In some embodiments, refer to Figures 4 to 7 The outer casing 20 includes two first walls 23, which are located on opposite sides of the electrode assembly 10 along the first direction X. The insulating body 46 includes two first insulating portions 41 and two second insulating portions 42. The two first insulating portions 41 are respectively connected to the two first walls 23. The two second insulating portions 42 are respectively connected to the two first insulating portions 41 and are bent relative to the two first insulating portions 41. The two second insulating portions 42 are spaced apart along the first direction X. The insulating member 40 includes a plurality of protrusions 43, and each second insulating portion 42 is connected to at least one protrusion 43.

[0155] The two first insulating parts 41 respectively cover the outer surfaces of the two first walls 23 to improve the insulating protection effect of the insulating member 40 on the two first walls 23.

[0156] Two second insulating portions 42 respectively cover two edge regions of the second wall 24 along the first direction X. The surface areas of the two second insulating portions 42 covering the second wall 24 may be the same or different. Optionally, the two second insulating portions 42 are symmetrically arranged along the first direction X.

[0157] The second insulating portion 42 has an end face 42a away from the first insulating portion 41, which is connected to the second insulating portion 42. At least a portion of the protrusion 43 protrudes from the end face 42a of the second insulating portion 42, which is connected to the protrusion 43.

[0158] The number of protrusions 43 connected to one second insulating portion 42 may be the same as or different from the number of protrusions 43 connected to another second insulating portion 42. The protrusions 43 connected to one second insulating portion 42 and the protrusions 43 connected to another second insulating portion 42 may be correspondingly arranged along the first direction X, or they may be at least partially offset in the first direction X.

[0159] Each second insulating portion 42 may be connected to one or more protrusions 43. When there are multiple protrusions 43 connected to the same second insulating portion 42, the multiple protrusions 43 may be arranged at intervals along the third direction Z.

[0160] Each second insulating portion 42 is connected to at least one protrusion 43. The portion of each second insulating portion 42 that is close to the protrusion 43 connected to it can be constrained by the protrusion 43, which helps to reduce the risk of each second insulating portion 42 lifting up.

[0161] In some embodiments, the protrusions 43 connected to one second insulating portion 42 and the protrusions 43 connected to another second insulating portion 42 are arranged along the first direction X and spaced apart.

[0162] In the same plane perpendicular to the second direction Y, the orthographic projection of the protrusion 43 connected to one second insulating part 42 does not overlap with the orthographic projection of the protrusion 43 connected to another second insulating part 42.

[0163] Optionally, the protrusions 43 connected to one second insulating part 42 and the protrusions 43 connected to another second insulating part 42 may be symmetrically arranged.

[0164] The protrusions 43, which are respectively connected to the two second insulating parts 42, are arranged along the first direction X. Protrusions 43 can be provided at locations where the two second insulating parts 42 are prone to warping, which helps reduce the risk of warping. The protrusions 43, which are respectively connected to the two second insulating parts 42, are spaced apart along the first direction X, which saves material on the insulating component 40 and helps reduce costs.

[0165] In some embodiments, each second insulating portion 42 is connected to a plurality of protrusions 43. The plurality of protrusions 43 connected to one second insulating portion 42 and the plurality of protrusions 43 connected to another second insulating portion 42 are arranged in a one-to-one correspondence along the first direction X.

[0166] The dimensions of the plurality of protrusions 43 connected to the same second insulating portion 42 protruding from the second insulating portion 42 along the first direction X can be the same or different. The dimensions of the plurality of protrusions 43 connected to the same second insulating portion 42 along the third direction Z can be the same or different.

[0167] As an example, the two protrusions 43 are arranged at intervals along the first direction X, which helps to shorten the size of the protrusions 43 protruding from the second insulating part 42 and save the material cost of the insulating part 40.

[0168] As an example, the two protrusions 43 that are set one-to-one along the first direction X partially overlap and connect, which helps to enhance the connection strength and reduce the risk of the insulating part 40 lifting.

[0169] The protrusions 43 connected to the two second insulating portions 42 are respectively provided in a one-to-one correspondence along the first direction X. On the one hand, the protrusions 43 can be provided at positions where the two second insulating portions 42 are prone to warping, which helps to reduce the risk of warping of each second insulating portion 42. On the other hand, with the size of the protrusions 43 protruding from the second insulating portion 42 remaining unchanged, the possibility of the two corresponding protrusions 43 connected to the two second insulating portions 42 being stacked and connected can be increased, which helps to further reduce the risk of warping of the second insulating portions 42 while controlling costs.

[0170] In some embodiments, refer to Figure 5 The protrusion 43 connected to one second insulating portion 42 is connected to at least one of another second insulating portion 42, the protrusion 43 connected to another second insulating portion 42, and the first insulating portion 41 connected to another second insulating portion 42. This helps to enhance the connection strength of the protrusion 43 and further reduce the risk of the insulating member 40 lifting.

[0171] In some examples, the protrusion 43 connected to one second insulating portion 42 is connected to another second insulating portion 42.

[0172] In other examples, the protrusion 43 connected to one second insulating portion 42 is connected to the protrusion 43 connected to another second insulating portion 42.

[0173] In some other examples, the protrusion 43 is connected to a second insulating portion 42 and the first insulating portion 41 is connected to another second insulating portion 42.

[0174] In some other examples, the protrusion 43 connected to one second insulating portion 42 is connected to another second insulating portion 42, and the protrusion 43 connected to the other second insulating portion 42 is connected to it.

[0175] In some embodiments, refer to Figures 4 to 7 In the same plane perpendicular to the second direction Y, the orthographic projection of the second insulating part 42 and the orthographic projection of the electrode terminal 30 do not overlap.

[0176] Along the first direction X, the size of the second insulating portion 42 may be less than or equal to the distance between the electrode terminal 30 and the first wall 23 near the second insulating portion 42.

[0177] The second insulating part 42 does not cover the electrode terminal 30, which is beneficial for the electrical connection between the electrode terminal 30 and the bus component, and also reduces the risk of the second insulating part 42 lifting.

[0178] In some embodiments, refer to Figures 3 to 6 The outer casing 20 includes a third wall 25 located on the Z-direction side of the electrode assembly 10 along the third direction and connected to the first wall 23 and the second wall 24. The insulating member 40 includes a third insulating portion 44 and a fourth insulating portion 45. The third insulating portion 44 is connected to the first insulating portion 41 and bent relative to the first insulating portion 41. The third insulating portion 44 is connected to the outer surface of the third wall 25. The fourth insulating portion 45 is connected to the third insulating portion 44 and bent relative to the third insulating portion 44. The fourth insulating portion 45 is connected to the outer surface of the second wall 24.

[0179] Optionally, the third wall 25 is one of the walls of the housing 21.

[0180] The third insulating part 44 may cover the outer surface of the third wall 25. The fourth insulating part 45 may be connected to the area of ​​the second wall 24 close to the third wall 25 along the third direction Z, and cover part of the outer surface of the second wall 24.

[0181] The third insulating portion 44 may be connected to the edge of the first insulating portion 41 along the third direction Z near the third wall 25. The fourth insulating portion 45 may be connected to the edge of the third insulating portion 44 along the second direction Y near the second wall 24. The fourth insulating portion 45 may extend from one end of the second wall 24 along the first direction X to the other end of the second wall 24 along the first direction X, so as to cover the outer surface of the entire edge of the second wall 24 near the third wall 25.

[0182] Optionally, along the second direction Y, a portion of the fourth insulating portion 45 and a portion of the second insulating portion 42 are stacked.

[0183] Optionally, the first insulating part 41, the third insulating part 44 and the fourth insulating part 45 are integrally formed.

[0184] In this embodiment, by connecting a third insulating part 44 to the third wall 25 of the outer casing 20 and a fourth insulating part 45 to the area of ​​the second wall 24 near the third wall 25, it is beneficial to increase the area of ​​the outer casing 20 covered by the insulating member 40 and improve the insulation protection effect of the insulating member 40.

[0185] In some embodiments, refer to Figure 8 and Figure 10The outer casing 20 includes two third walls 25, which are located on opposite sides of the electrode assembly 10 along the third direction Z. The insulating member 40 includes two third insulating portions 44, which are respectively connected to the two third walls 25. One of the third insulating portions 44 includes a first insulating layer 441 and a second insulating layer 442. Along the third direction Z, at least a portion of the first insulating layer 441 and at least a portion of the second insulating layer 442 are stacked and interconnected.

[0186] The first insulating layer 441 and the second insulating layer 442 may be connected by adhesive or other suitable means.

[0187] The first insulating portion 41, the second insulating portion 42, the protrusion 43, the fourth insulating portion 45, and another third insulating portion 44 may each include a single insulating layer.

[0188] The insulating member 40, when not assembled to the housing 20, can be a sheet-like component. During assembly, the sheet-like insulating member 40 can be wound and connected to the two first walls 23 and two third walls 25 of the housing 20, with the beginning and end of the insulating member 40 along the winding direction partially overlapping and connecting on one of the third walls 25. The portion of the insulating member 40 connected to the first wall 23 forms a first insulating portion 41, and the portion of the insulating member 40 connected to the third wall 25 forms a third insulating portion 44. At this time, along the direction of the electrode assembly 10 pointing to the second wall 24, a portion of the insulating member 40 may extend beyond the first wall 23, and another portion of the insulating member 40 may extend beyond the third wall 25. Folding the portion of the insulating member 40 extending beyond the first wall 23 and connecting it to the second wall 24 forms a second insulating portion 42, and folding the portion of the insulating member 40 extending beyond the third wall 25 and connecting it to the second wall 24 forms a fourth insulating portion 45.

[0189] In some examples, refer to Figure 5 and Figure 6 The protrusion 43 and the second insulating part 42 are integrally formed. The protrusion 43 can also be formed after the part of the insulating part 40 that extends beyond the first wall 23 is folded to the second wall 24.

[0190] In other examples, refer to Figure 12 The protrusion 43 and the second insulating part 42 are separate structures. The protrusion 43 can be connected to the second insulating part 42 and then to the second wall 24 after the second insulating part 42 is connected to the second wall 24; or the protrusion 43 can be connected to the second insulating part 42 first, and then the second insulating part 42 and the protrusion 43 can be folded over and connected to the second wall 24 at the same time.

[0191] The two insulating layers of one of the third insulating parts 44 are at least partially stacked and connected. On the one hand, this helps to improve the covering effect of the insulating part 40 on the third wall 25 and improve the problems of curling and lifting of the insulating part 40 at the beginning and end of the third wall 25. On the other hand, it can also improve the stability of the insulating part 40 covering the outer shell 20 and reduce the risk of the insulating part 40 becoming loose.

[0192] In some embodiments, the housing 20 includes a fourth wall 26 disposed opposite to the second wall 24 along a second direction Y. In some examples, an insulating body 46 is attached to the fourth wall 26, a portion of the insulating body 46 covering at least a portion of the outer surface of the fourth wall 26. In other examples, the insulating body 46 is not attached to the fourth wall 26.

[0193] In some embodiments, refer to Figure 7 The protrusion 43 protrudes from the insulating body 46 by a dimension of L1, where L1 ≤ 30 mm, or optionally, 2 mm ≤ L1 ≤ 20 mm.

[0194] Optionally, L1 can be 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, or any value between any two of these.

[0195] In this embodiment, setting L1 to less than or equal to 30mm helps reduce the material used in the insulating component 40 and saves costs. In this embodiment, setting L1 to greater than or equal to 2mm helps increase the connection area between the protrusion 43 and the second wall 24, enhances the connection strength between the protrusion 43 and the second wall 24, and reduces the risk of the insulating component 40 lifting off the second wall 24.

[0196] In this embodiment, L1 is set between 2mm and 20mm, which can achieve a balance between material cost and reducing the risk of warping of the insulation component 40.

[0197] In some embodiments, refer to Figure 7 Along the third direction Z, the size of the protrusion 43 is L2, where L2 ≥ 1 mm.

[0198] Optionally, L2 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm, 25mm, 30mm, etc.

[0199] In this embodiment, the size of the protrusion 43 along the third direction Z is set to be greater than or equal to 1 mm. The space of the second wall 24 in the third direction Z can be used to increase the area of ​​the protrusion 43, thereby increasing the connection area between the protrusion 43 and the second wall 24, improving the connection stability between the two, and helping to reduce the risk of the protrusion 43 itself lifting, thereby improving the anti-lifting effect on the insulating component 40.

[0200] In some embodiments, the sum of the dimensions of all protrusions 43 connected to the same second insulating portion 42 along the third direction Z is L3, the dimension of the second wall 24 along the third direction Z is L0, and L3 / L0≤0.9.

[0201] Optionally, L3 / L0 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or any two of these values.

[0202] In this embodiment, L3 / L0 is set to be less than or equal to 0.9, which helps to reduce the risk that the protrusion 43 may cover other structures on the second wall 24 (such as electrode terminals, pressure relief mechanisms, injection holes, etc.).

[0203] In some embodiments, the insulating element 40 is bonded to the housing 20, and the peel strength between the insulating element 40 and the housing 20 is 200 N / m to 1000 N / m.

[0204] Optionally, the peel strength of the insulation 40 and the housing 20 can be 200 N / m, 300 N / m, 400 N / m, 500 N / m, 600 N / m, 700 N / m, 800 N / m, 900 N / m, 1000 N / m or any value between any two of them.

[0205] As an example, the insulation 40 can be fixed on a tensile testing machine and pulled 180° to test the peel strength between the insulation 40 and the housing 20.

[0206] As an example, peel strength can be tested according to GB / T 2792-2014 Test Method for Peel Strength of Adhesive Tapes.

[0207] The high peel strength between the insulating component 40 and the housing 20 reduces the risk of the insulating component 40 peeling off the housing 20, which helps to improve reliability.

[0208] In some embodiments, refer to Figure 5 and Figure 6 The first insulating part 41, the second insulating part 42 and the protrusion 43 are integrally formed, which helps to simplify the assembly process of the insulating part 40 and the outer shell 20 and improve assembly efficiency.

[0209] Optionally, the first insulating part 41, the second insulating part 42, the protrusion 43, the third insulating part 44 and the fourth insulating part 45 are integrally formed.

[0210] In some embodiments, refer to Figure 12 The second insulating part 42 and the protrusion 43 are separate structures. A part of the protrusion 43 is connected to the second insulating part 42, and the other part of the protrusion 43 is connected to the outer surface of the second wall 24.

[0211] Optionally, the first insulating part 41 and the second insulating part 42 are integrally formed.

[0212] A portion of the protrusion 43 may be connected to the side of the second insulating portion 42 facing away from the second wall 24. The connection between the protrusion 43 and the second insulating portion 42 may include, but is not limited to, a connection. Another portion of the protrusion 43 may be attached to the outer surface of the second wall 24 and connected to the second wall 24 by a connection or other suitable means.

[0213] A portion of the protrusion 43 is connected to the second insulating portion 42, which can increase the connection area between the second insulating portion 42 and the protrusion 43, enhance the restraining effect of the protrusion 43 on the second insulating portion 42, and thus help improve the anti-lifting effect of the second insulating portion 42.

[0214] In some embodiments, refer to Figure 7 The battery cell 6 includes a pressure relief mechanism 50, which is located on the second wall 24. The protrusion 43 and the pressure relief mechanism 50 are spaced apart along the third direction Z.

[0215] The pressure relief mechanism 50 is used to release gas inside the battery cell 6. As an example, the pressure relief mechanism 50 can be actuated when the internal pressure or temperature of the battery cell 6 reaches a predetermined threshold to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 6 reaches the predetermined threshold, the pressure relief mechanism 50 performs its action, or a weak structure provided in the pressure relief mechanism 50 is damaged, thereby forming an opening or channel for releasing internal pressure or temperature, thus achieving the purpose of pressure relief and helping to reduce the risk of the battery cell 6 exploding due to excessive internal gas pressure.

[0216] As an example, the pressure relief mechanism 50 may be separately mounted to the second wall 24 and connected by welding or other suitable means.

[0217] As an example, the pressure relief mechanism 50 can also be integrally formed with the second wall 24.

[0218] The pressure relief mechanism 50 is exposed on the side of the second wall 24 facing away from the electrode assembly 10. In the same plane perpendicular to the second direction Y, the orthographic projection of the pressure relief mechanism 50 and the orthographic projection of the protrusion 43 do not overlap, which can reduce the adverse effects of the protrusion 43 on the pressure relief mechanism 50 and facilitate the normal pressure relief of the pressure relief mechanism 50.

[0219] The fact that the protrusion 43 and the pressure relief mechanism 50 are spaced apart along the third direction Z means that the edge of the protrusion 43 near the pressure relief mechanism 50 along the third direction Z is spaced apart from the pressure relief mechanism 50. This staggering of the protrusion 43 and the pressure relief mechanism 50 along the third direction Z helps to reduce the influence and limitation of the pressure relief mechanism 50 on the size of the protrusion 43 protruding from the insulating body 46 in the first direction X, increases the connection area between the protrusion 43 and the second wall 24, improves the connection stability between the protrusion 43 and the second wall 24, and reduces the risk of the insulating component 40 lifting off the second wall 24.

[0220] In some embodiments, refer to Figure 5 and Figure 7 Along the third direction Z, the area of ​​the second wall 24 located between the electrode terminal 30 and the pressure relief mechanism 50 is connected to at least one protrusion 43.

[0221] Optionally, both the pressure relief mechanism 50 and the electrode terminal 30 are located in the second portion 242. The pressure relief mechanism 50 and the electrode terminal 30 may be arranged at a Z-distance along a third direction. At least one protrusion 43 is connected to the area of ​​the second portion 242 located between the electrode terminal 30 and the pressure relief mechanism 50.

[0222] Due to the limitations of the pressure relief mechanism 50 and the electrode terminal 30, the portions of the insulating body 46 corresponding to the pressure relief mechanism 50 and the portions of the insulating body 46 corresponding to the electrode terminal 30 are smaller in the first direction X, making them more prone to warping.

[0223] In this embodiment, at least one protrusion 43 is connected to the area of ​​the second wall 24 between the electrode terminal 30 and the pressure relief mechanism 50. This increases the connection area between the insulating member 40 and the area of ​​the second wall 24 between the electrode terminal 30 and the pressure relief mechanism 50, and reduces the risk of warping of the portion of the insulating body 46 corresponding to the pressure relief mechanism 50 and the portion of the insulating body 46 corresponding to the electrode terminal 30.

[0224] In some embodiments, refer to Figure 7 The second wall 24 is provided with injection holes 246, and the protrusion 43 and injection holes 246 are spaced apart along the third direction Z.

[0225] In the same plane perpendicular to the second direction Y, the orthographic projection of the protrusion 43 and the projection of the injection hole 246 do not overlap. The protrusion 43 does not cover the injection hole 246.

[0226] The fact that the protrusion 43 and the injection hole 246 are spaced apart along the third direction Z means that the edge of the protrusion 43 near the injection hole 246 is spaced apart from the injection hole 246 along the third direction Z. This staggered arrangement of the protrusion 43 and the injection hole 246 along the third direction Z helps to reduce the influence and limitation of the injection hole 246 on the size of the protrusion 43 protruding from the insulating body 46, increases the connection area between the protrusion 43 and the second wall 24, improves connection stability, and reduces the risk of the insulating component 40 warping.

[0227] In some embodiments, the material of the insulating element 40 may include polyethylene terephthalate, which has good mechanical properties and wear resistance, thus improving the insulation and protection effect.

[0228] In some embodiments, refer to Figure 3 The battery cell 6 includes a protective member 60. Along the second direction Y, at least a portion of the insulator 40 is connected to the second wall 24 and is located between the protective member 60 and the second wall 24. The protective member 60 is connected to the second wall 24 and the insulator 40. The protective member 60 is provided with a clearance hole 61 through which the electrode terminal 30 is exposed on the side of the protective member 60 away from the second wall 24.

[0229] At least a portion of the second insulating portion 42 is located between the protective member 60 and the second wall 24. The protective member 60 may be connected to the second insulating portion 42.

[0230] At least a portion of the protrusion 43 is located between the protective member 60 and the second wall 24. The protective member 60 may be connected to the protrusion 43.

[0231] At least a portion of the fourth insulating portion 45 is located between the protective member 60 and the second wall 24. The protective member 60 may be connected to the fourth insulating portion 45.

[0232] Along the second direction Y, at least a portion of the insulating member 40 connected to the second wall 24 can be clamped between the protective member 60 and the second wall 24.

[0233] The connection between the protective element 60 and the second wall 24 includes, but is not limited to, bonding. The connection between the protective element 60 and the insulating element 40 includes, but is not limited to, bonding.

[0234] Optionally, the thickness of the protective element 60 is greater than the thickness of the insulating element 40, and the protective element 60 has better wear resistance.

[0235] Optionally, the protective element 60 can be an insulating component.

[0236] The protective element 60 can restrict at least a portion of the connection of the insulating element 40 to the second wall 24, which helps to further reduce the risk of the insulating element 40 lifting off the second wall 24. The protective element 60 can also protect the insulating element 40 and the second wall 24, reduce the risk of wear on the insulating element 40, and help to improve the insulation protection effect.

[0237] According to a second aspect of this application, embodiments of this application also provide a battery device 2, referring to... Figure 2 The battery device 2 includes a battery cell 6 provided according to any embodiment of the first aspect of this application.

[0238] According to a third aspect of this application, embodiments of this application also provide an electrical device, which includes a battery device 2 provided according to any embodiment of the second aspect of this application, the battery device 2 being used to provide electrical energy.

[0239] The battery cell 6 provided in this embodiment includes an electrode assembly 10, a housing 20, electrode terminals 30, and an insulating member 40. The electrode assembly 10 is housed within the housing 20. The housing 20 includes two first walls 23 and a second wall 24 connected to the two first walls 23. Along the thickness direction of the battery cell 6, the two first walls 23 are located on both sides of the electrode assembly 10, and the second wall 24 is located on one side of the electrode assembly 10 along a second direction Y, which is perpendicular to the thickness direction. The second wall 24 includes a first portion 241, a second portion 242, and a bent portion 243. In the second direction Y, the second portion 242 is closer to the electrode assembly 10 than the first portion 241, and the bent portion 243 connects the first portion 241 and the second portion 242. The electrode terminals 30 are disposed on the second wall 24. The insulating member 40 covers the outside of the housing 20 and includes two first insulating portions 41, two second insulating portions 42, and a plurality of protrusions 43. The two first insulating portions 41 are respectively bonded to the first walls 23. Two second insulating portions 42 are respectively connected to two first insulating portions 41 and bent relative to the two first insulating portions 41. The second insulating portions 42 are bonded to the second wall 24. At least a portion of the protrusion 43 protrudes from the edge of the second insulating portion 42 away from the first insulating portion 41 and is bonded to the second wall 24. Each second insulating portion 42 is connected to at least one protrusion 43. In the same plane perpendicular to the thickness direction, the orthographic projection of the protrusion 43 does not overlap with the orthographic projection of the electrode terminal 30. The second insulating portion 42 is bonded to the first portion 241, the second portion 242, and the bent portion 243. The protrusion 43 is bonded to at least one of the first portion 241, the second portion 242, and the bent portion 243. The protrusion 43 connected to one second insulating portion 42 and the protrusion 43 connected to the other second insulating portion 42 are provided in a one-to-one correspondence along the thickness direction. The two protrusions 43 provided in a one-to-one correspondence along the thickness direction are spaced apart or partially overlapped and connected.

[0240] The protrusion 43 protrudes from the second insulating part 42 by a dimension L1, where L1 ≤ 30 mm, and optionally, 2 mm ≤ L1 ≤ 20 mm. Along the third direction Z, the protrusion 43 has a dimension L2, where L2 ≥ 1 mm. The peel strength between the insulating member 40 and the outer shell 20 is 200 N / m - 1000 N / m.

[0241] 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; A housing, in which the electrode assembly is housed, the housing including a first wall and a second wall that intersect each other, the first wall being located on one side of the electrode assembly along a first direction, and the second wall being located on one side of the electrode assembly along a second direction; Electrode terminals are disposed on the second wall; as well as An insulating element is provided, covering the side of the housing away from the electrode assembly and connected to the first wall and the second wall. The insulating element includes an insulating body and a protrusion. At least a portion of the insulating body is disposed on the first wall and the second wall. At least a portion of the protrusion is disposed on the second wall and connected to the insulating body. At least a portion of the protrusion protrudes from the edge of the insulating body along the first direction. The electrode terminals and the protrusion are spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that, In the same plane perpendicular to the first direction, the orthographic projection of the protrusion does not overlap with the orthographic projection of the electrode terminal.

3. The battery cell according to claim 1 or 2, characterized in that, In the same plane perpendicular to the third direction, the orthographic projection of the protrusion and the orthographic projection of the electrode terminal partially overlap.

4. The battery cell according to claim 1 or 2, characterized in that, The second wall includes a first portion, a second portion, and a bend, wherein in the second direction, the second portion is closer to the electrode assembly than the first portion, and the bend connects the first portion and the second portion; The electrode terminals are disposed in the first part or the second part; The protrusion is connected to at least one of the first portion, the second portion, and the bent portion.

5. The battery cell according to claim 4, characterized in that, At least a portion of the protrusion is connected to the area of ​​the second portion near the bend.

6. The battery cell according to claim 4, characterized in that, The electrode terminals are located in the second part.

7. The battery cell according to claim 6, characterized in that, The electrode assembly includes a main body and an electrode tab, the electrode tab extending from the end face of the main body toward the second wall; A first recess is formed on the side of the second wall facing the electrode assembly. The first recess is recessed relative to the surface of the second portion facing the electrode assembly, and the bottom surface of the first recess corresponds to the first portion. In the same plane perpendicular to the first direction, the orthographic projection of the tab at least partially overlaps with the orthographic projection of the first recess.

8. The battery cell according to claim 7, characterized in that, At least a portion of the tab is accommodated in the first recess.

9. The battery cell according to claim 4, characterized in that, The second wall includes two first portions and two bends, with each end of the second portion connected to one of the first portions via the two bends. The second portion and the two bends define a second recess, which is recessed relative to the surface of the first portion away from the electrode assembly; or The second wall includes two second parts and two bends, with the two ends of the first part respectively connected to the two second parts via the two bends.

10. The battery cell according to claim 1 or 2, characterized in that, The insulating body includes a first insulating part and a second insulating part, the first insulating part is connected to the first wall, the second insulating part is connected to the first insulating part and bent relative to the first insulating part, and the second insulating part is connected to the second wall; At least a portion of the protrusion protrudes from the edge of the second insulating portion away from the first insulating portion and is connected to the second wall.

11. The battery cell according to claim 10, characterized in that, The housing includes two first walls, which are respectively located on both sides of the electrode assembly along the first direction; The insulating body includes two first insulating parts and two second insulating parts. The two first insulating parts are respectively connected to the two first walls, and the two second insulating parts are respectively connected to the two first insulating parts and are bent relative to the two first insulating parts. Along the first direction, the two second insulating parts are spaced apart. The insulating member includes a plurality of the protrusions, and each of the second insulating portions is connected to at least one of the protrusions.

12. The battery cell according to claim 11, characterized in that, Each of the second insulating portions is connected to a plurality of the aforementioned protrusions; The plurality of protrusions connected to one of the second insulating portions and the plurality of protrusions connected to another of the second insulating portions are provided in a one-to-one correspondence along the first direction.

13. The battery cell according to claim 10, characterized in that, The protrusion connected to one of the second insulating portions is connected to at least one of the other second insulating portion, the protrusion connected to the other second insulating portion, and the first insulating portion connected to the other second insulating portion.

14. The battery cell according to claim 10, characterized in that, The first insulating part, the second insulating part, and the protrusion are integrally formed.

15. The battery cell according to claim 10, characterized in that, The second insulating part and the protrusion are separate structures, with one part of the protrusion connected to the second insulating part and the other part of the protrusion connected to the second wall.

16. The battery cell according to claim 10, characterized in that, In the same plane perpendicular to the second direction, the orthographic projection of the second insulating portion and the orthographic projection of the electrode terminal do not overlap.

17. The battery cell according to claim 10, characterized in that, The housing includes a third wall located on one side of the electrode assembly along the third direction and connected to the first wall and the second wall; The insulating body includes a third insulating part and a fourth insulating part. The third insulating part is connected to the first insulating part and bent relative to the first insulating part. The third insulating part is connected to the third wall. The fourth insulating part is connected to the third insulating part and bent relative to the third insulating part. The fourth insulating part is connected to the second wall.

18. The battery cell according to claim 17, characterized in that, The housing includes two third walls, which are respectively located on both sides of the electrode assembly along the third direction; The insulating body includes two third insulating portions, which are respectively connected to two third walls. One of the third insulating portions includes a first insulating layer and a second insulating layer. Along the third direction, at least a portion of the first insulating layer and at least a portion of the second insulating layer are stacked and connected to each other.

19. The battery cell according to claim 1 or 2, characterized in that, The protrusion protrudes from the insulating body by a dimension L1, where L1 ≤ 30 mm, and optionally, 2 mm ≤ L1 ≤ 20 mm.

20. The battery cell according to claim 1 or 2, characterized in that, Along the third direction, the size of the protrusion is L2, where L2 ≥ 1 mm.

21. The battery cell according to claim 1 or 2, characterized in that, The insulating component is bonded to the outer shell, and the peel strength between the insulating component and the outer shell is 200N / m-1000N / m.

22. The battery cell according to claim 1 or 2, characterized in that, The battery cell includes a pressure relief mechanism, which is disposed on the second wall; The protrusion and the pressure relief mechanism are spaced apart along the third direction.

23. The battery cell according to claim 22, characterized in that, Along the third direction, at least one of the protrusions is connected to the region of the second wall located between the electrode terminal and the pressure relief mechanism.

24. The battery cell according to claim 1 or 2, characterized in that, The second wall is provided with an injection hole, and the protrusion and the injection hole are spaced apart along the third direction.

25. The battery cell according to claim 1 or 2, characterized in that, The battery cell includes a protective member, and along the second direction, at least a portion of the insulating member connected to the second wall is located between the protective member and the second wall, and the protective member is connected to the second wall and the insulating member; The protective member is provided with a clearance hole, through which the electrode terminal is exposed on the side of the protective member away from the second wall.

26. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-25.

27. An electrical appliance, characterized in that, Includes the battery device according to claim 26, the battery device being used to provide electrical energy.

Images