Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization equipment. The battery monomer comprises an electrode assembly, a shell, an electrode terminal and an insulating piece. The electrode assembly is accommodated in the shell, the shell comprises a first wall and a second wall which are arranged to intersect, the first wall is located at one side of the electrode assembly along a first direction, and the second wall is located at one side of the electrode assembly along a second direction which is perpendicular to the first direction. The electrode terminal is arranged on the first wall. The insulating piece is connected to the first wall and the second wall, the insulating piece comprises a first insulating part and a second insulating part which are connected to each other, the first insulating part is arranged on the first wall, the second insulating part is arranged on the second wall, and the thickness of at least part of the first insulating part is smaller than the thickness of at least part of the second insulating part. The thickness of at least part of the first insulating part is smaller, the structural strength is smaller, the ductility and the deformation ability are better, the problem of the first insulating part being warped is improved, the insulation protection effect of the insulating piece is improved, and the reliability of the battery monomer is improved.

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 intersecting 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 perpendicular to the first direction. The electrode terminals are disposed on the first wall. The insulating member connects to the first and second walls, and includes a first insulating portion and a second insulating portion connected to each other. The first insulating portion is disposed on the first wall, and the second insulating portion is disposed on the second wall. At least a portion of the thickness of the first insulating portion is less than at least a portion of the thickness of the second insulating portion. The greater thickness of the at least portion of the second insulating portion results in higher structural strength, which helps reduce the risk of the second insulating portion being worn or punctured. The smaller thickness of the at least portion of the first insulating portion results in lower structural strength, which helps improve the ductility and deformability of the first insulating portion, thereby improving the connection stability and reliability between the first insulating portion and the first wall, mitigating the problem of the first insulating portion warping, improving the insulation protection effect of the insulating member, and improving the reliability of the battery cell.

[0006] In some embodiments, the insulating component covers the side of the housing away from the electrode assembly. When multiple battery cells are stacked, direct contact between adjacent cells is less likely, which also helps reduce electric field concentration, increases creepage distance between adjacent cells, and improves insulation performance between adjacent cells. The first insulating portion is thinner, has better ductility and deformation capacity, and is less likely to warp from the first wall, reducing the space occupied by the first insulating portion. This facilitates reliable connection between electrode terminals and other components, and also helps reduce the assembly difficulty of the battery device and improve its assembly efficiency.

[0007] In some embodiments, the electrode assembly includes a main body and a tab connected to the main body; the first wall includes a first portion, a second portion, and a bent portion, wherein in a first direction, the second portion is closer to the main body than the first portion, and the bent portion connects the first portion and the second portion; a portion of the first insulating portion is connected to the bent portion and has a thickness less than that of the second insulating portion. The portion of the first insulating portion connected to the bent portion is thinner, making it easier to stretch and deform during connection to the bent portion, thereby reducing wrinkles or gaps in the insulating component during folding to the first wall and improving the problem of warping of the insulating component.

[0008] In some embodiments, electrode terminals are disposed in the second portion; a first recess is formed on the side of the first wall facing the electrode assembly, the first recess being recessed relative to the surface of the second portion facing the electrode assembly, and the bottom surface of the first recess corresponding to the first portion; at least a portion of the tab is located on the side of the main body facing the first wall, and in the same plane perpendicular to the first direction, the orthographic projection of the tab lies within the orthographic projection of the first recess, and at least a portion of the tab is accommodated in the first recess. The first recess can provide accommodating space and buffer space for the tab, reducing the squeezing effect on the tab and lowering the risk of tab breakage. The tab can also share part of the space in the first direction with the housing, which is beneficial to improving space utilization and increasing the energy density of the battery cell.

[0009] In some embodiments, the first insulating portion includes a plurality of first insulating layers stacked along a first direction, each first insulating layer connecting to the second insulating portion; at least one first insulating layer has a first opening that penetrates the first insulating layer along the first direction, and in the same plane perpendicular to the first direction, the orthographic projection of the first opening in one first insulating layer lies within the orthographic projection of the remaining at least one first insulating layer. By providing the first opening, the portion of the first insulating portion corresponding to the first opening is thinner, making it easier to stretch and deform, which is beneficial to improving the reliability and stability of the connection between the first insulating portion and the first wall, and reducing the risk of the first insulating portion warping. Along the first direction, the first opening overlaps with other first insulating layers, and the first insulating portion as a whole does not form an opening exposing the first wall, which is beneficial to improving the insulation protection effect.

[0010] In some embodiments, the electrode assembly includes a main body and a tab connected to the main body; the first wall includes a first portion, a second portion, and a bent portion, wherein in a first direction, the second portion is closer to the main body than the first portion, and the bent portion connects the first portion and the second portion; in the same plane perpendicular to the first direction, the orthographic projection of at least one first opening at least partially overlaps with the orthographic projection of the bent portion. During the connection between the first insulating portion and the first wall, the first opening corresponding to the bent portion can expand in a third direction, which facilitates the extension and deformation of the portion of the first insulating portion covering the bent portion in the third direction, thereby extending the dimension of this portion in the third direction to better fit the shape of the bent portion, thereby improving the connection reliability between this portion and the bent portion and reducing the risk of this portion warping.

[0011] In some embodiments, one end of the first opening extends to the edge of the first insulating layer away from the second insulating portion. The open end of the first opening away from the second insulating portion, forming a notch, helps reduce the restriction on the first opening, making it easier for the first opening to open and increasing the degree of stretchability and deformation of the first insulating portion, thereby further reducing the risk of warping. The notch-shaped first opening also reduces the possibility of wrinkles forming in the first insulating layer during stretching and deformation.

[0012] In some embodiments, the other end of the first opening extends to the second insulating portion. A longer extension length of the first opening is advantageous for increasing the expansion distance of the first opening and increasing the degree of stretchability and deformation of the first insulating portion, thereby further reducing the risk of warping.

[0013] In some embodiments, the first insulating layer with a first opening includes a plurality of first insulating segments, which are spaced apart along a third direction. A first opening is formed between two adjacent first insulating segments, and the first direction, second direction, and third direction are perpendicular to each other. The plurality of first insulating segments are separated by the first opening, and the spacing between two adjacent first insulating segments can vary slightly within an appropriate range, which is beneficial for the extension and deformation of the first insulating portion and reduces its risk of warping.

[0014] In some embodiments, the first opening extends at an angle relative to the second direction. The connection between the portion of the first insulating layer separated by the first opening (e.g., the first insulating segment) and other portions of the first insulating layer (e.g., the first base) or the second insulating portion is relatively smooth, which helps to reduce the risk of the first insulating layer tearing at the first opening.

[0015] In some embodiments, each of two adjacent first insulating layers is provided with a plurality of first openings, wherein the first openings of one first insulating layer are spaced apart from the first openings of the other first insulating layer along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. The first openings of two adjacent first insulating layers are completely staggered along the third direction, and the first openings of two adjacent first insulating layers do not overlap in the first direction. The first insulating portion will not form an opening that exposes the first wall, and the local thickness of the first insulating portion will not be too thin to affect its structural strength. This helps to reduce the risk of tearing of the first insulating portion during stretching and deformation, thereby improving the insulation and protection effect of the first insulating portion.

[0016] In some embodiments, in two adjacent first insulating layers that both have a first opening, the first opening of one first insulating layer is alternately arranged with the first opening of the other first insulating layer along a third direction. The multiple first openings of each first insulating layer are not concentrated in a localized area of ​​the first insulating layer, which helps to improve the uniformity of the elongation and deformation capacity of different areas of the first insulating portion, reduces the possibility of some first insulating layers breaking due to the tensile force of other first insulating layers, thereby improving the strength of the first insulating portion and enhancing its insulating and protective effect.

[0017] In some embodiments, along a third direction, multiple first openings of the same first insulating layer are equally spaced along the third direction; in two adjacent first insulating layers, the spacing between two adjacent first openings of one first insulating layer is the same as the spacing between two adjacent first openings of the other first insulating layer. Multiple first insulating layers can be cut from a strip of insulating material, which is beneficial for improving the production efficiency of the first insulating layers. Stacking two adjacent first insulating layers also reduces the possibility of overlap of the first openings in the first direction, which is beneficial for improving the production yield of the insulating components.

[0018] In some embodiments, along a third direction, the first openings of one first insulating layer are equally spaced from the first openings of another first insulating layer. This improves the uniformity of the distribution of the first openings, enhances the extension deformation effect of the first insulating portion, and reduces the risk of localized stress concentration and fracture of the first insulating portion. A more uniform distribution of the first openings also helps reduce the risk of overlap between the first openings of adjacent first insulating layers along the first direction after the first insulating portion has extended and deformed.

[0019] In some embodiments, at least one first insulating layer has a plurality of first openings spaced apart along a third direction. The distance between two adjacent first openings of the same first insulating layer along the third direction is d1, where 1mm ≤ d1 ≤ 5mm, and the first direction, the second direction, and the third direction are perpendicular to each other. If d1 is greater than or equal to 1mm, the portion of the first insulating layer between two first openings is larger. In the first direction, the first opening of the first insulating layer is less likely to overlap with the first opening of the adjacent first insulating layer, which is beneficial to improving the insulation protection effect. If d1 is less than or equal to 5mm, it is beneficial to improve the elongation and deformation capacity of the first insulating portion, improve the connection effect between the first insulating portion and the first wall, and reduce the risk of the first insulating portion warping.

[0020] In some embodiments, among the plurality of first insulating layers, the first insulating layer furthest from the first wall does not have a first opening. The first insulating layer furthest from the first wall is continuous and complete. This first insulating layer can cover the first openings of the remaining first insulating layers, and can also cover other structures (such as adhesive layers) between adjacent first insulating layers and between the first insulating layer and the first wall, reducing the possibility of impurities such as dust and metal particles embedding in the first insulating portion, and reducing the risk of insulation failure due to wear of the first insulating portion by impurities.

[0021] In some embodiments, the elongation of the first insulating layer furthest from the first wall is greater than that of the other first insulating layers. The larger elongation of the first insulating layer furthest from the first wall results in a stronger ability to stretch and deform, which is beneficial for adapting to the stretching and deformation of the other first insulating layers and reduces the risk of breakage of the first insulating layer furthest from the first wall without the first opening.

[0022] In some embodiments, the second insulating portion includes a plurality of second insulating layers stacked along a second direction, with each of the plurality of second insulating layers corresponding to a plurality of first insulating layers, and the corresponding first and second insulating layers are integrally formed. The junction between the first and second insulating layers is less prone to cracking, which helps improve the structural strength of the insulating component, reduces the risk of breakage at the connection point between the first and second insulating portions after the first insulating portion is folded to the first wall, and improves the insulating protection effect of the insulating component. Furthermore, it also simplifies the structure and forming method of the insulating component.

[0023] In some embodiments, a second insulating layer connected to a first insulating layer having a first opening has a second opening. The second opening penetrates the second insulating layer along a second direction. One end of the second opening connects to the corresponding first opening, and the other end is spaced apart from the edge of the second insulating layer away from the first insulating portion. The second opening does not extend to the edge of the second insulating layer away from the first insulating portion. The portion of the second insulating portion corresponding to the second opening is thinner and has lower strength, making it easier to stretch and deform. This facilitates a smoother folding of the first insulating portion onto the first wall, reduces the pulling effect of the second insulating portion on the first insulating portion, improves the reliability and stability of the connection between the first insulating portion and the first wall, and reduces the risk of the first insulating portion warping.

[0024] In some embodiments, the length of the second opening in its own extending direction is L, where 0.5mm ≤ L ≤ 10mm. A length L greater than or equal to 0.5mm increases the size of the thinned portion of the second insulation part, which is more conducive to the folding of the first insulation part, making the effect of improving the warping phenomenon of the first insulation part more obvious. A length L less than or equal to 10mm helps to reduce the impact of the second opening on the overall structural strength of the second insulation part, improving the insulation and protection effect of the second insulation part.

[0025] In some embodiments, the second opening extends at an angle relative to the first direction. The connection between the portion of the second insulating layer separated by the second opening (e.g., the second insulating segment) and other portions of the second insulating layer (e.g., the second base) is relatively smooth, which helps to reduce the risk of the second insulating layer tearing at the second opening.

[0026] In some embodiments, the insulating component includes a first adhesive layer, which includes a first adhesive portion and a second adhesive portion. The first adhesive portion bonds two adjacent first insulating layers, and the second adhesive portion bonds two adjacent second insulating layers. The first insulating portion includes the first adhesive portion, and the second insulating portion includes the second adhesive portion. Bonding two adjacent first insulating layers and two adjacent second insulating layers together improves the connection strength and reliability between the layers of the first insulating portion and between the layers of the second insulating portion, thereby improving the structural stability of the insulating component.

[0027] In some embodiments, the insulating element includes a second adhesive layer, which includes a third adhesive portion and a fourth adhesive portion. The third adhesive portion adheres to a first wall and a first insulating layer closest to the first wall, and the fourth adhesive portion adheres to a second wall and a second insulating layer closest to the second wall. The first insulating portion includes the third adhesive portion, and the second insulating portion includes the fourth adhesive portion. Adhesion between the first insulating layer and the first wall, and between the second insulating layer and the second wall, improves the connection strength and reliability between the first insulating portion and the first wall, and between the second insulating portion and the second wall, thereby enhancing the connection strength between the insulating element and the housing.

[0028] In some embodiments, the first insulating portion includes a first insulator portion and a second insulator portion, with the second insulator portion connecting the first and second insulator portions. The thickness of the first insulator portion is less than the thickness of the second insulator portion and the thickness of the second insulator portion. A thinner first insulator portion is more flexible and easier to stretch and deform, which helps improve the connection stability and reliability between the first insulator portion and the first wall, reducing the risk of the first insulator portion warping. However, an overall thinner first insulator portion results in lower structural strength, making it prone to breakage and insulation failure. Therefore, the first insulating portion also includes a thicker second insulator portion with higher strength, which helps reduce the risk of insulation failure in the first insulating portion and also helps reduce the risk of breakage at the connection point between the first and second walls, improving the insulation protection effect of the insulating component.

[0029] In some embodiments, along the second direction, the distance between the first insulator portion and the second wall is d2, where 0.2mm ≤ d2 ≤ 3mm. A d2 greater than or equal to 0.2mm increases the size of the second insulator portion in the second direction, increases the area of ​​the first wall covered by the second insulator portion, and reduces the risk that the first insulator portion will not effectively insulate the first wall after it breaks. A d2 less than or equal to 3mm is advantageous for increasing the size of the first insulator portion in the second direction within a limited area, increasing the malleable deformation capacity of the first insulator portion, and improving the effect of preventing the first insulator portion from warping.

[0030] In some embodiments, the thickness of the first insulator portion is h1, and the thickness of the second insulator portion is h2, where 0.3 ≤ h1 / h2 ≤ 0.6. When h1 / h2 is greater than or equal to 0.3, the thickness difference between the first and second insulator portions is not too large, which helps reduce the risk of cracking or breakage of the first insulator portion. When h1 / h2 is less than or equal to 0.6, it facilitates the stretching and deformation of the first insulator portion, reducing the risk of warping.

[0031] In some embodiments, the first insulating portion includes at least one first insulating layer, and the second insulating portion includes a plurality of second insulating layers stacked along a second direction. The number of first insulating layers is less than the number of second insulating layers, and each first insulating layer is connected to a corresponding second insulating layer. The fact that the number of insulating layers in the first insulating portion is less than the number of insulating layers in the second insulating portion means that the thickness of the first insulating portion is reduced by decreasing the number of insulating layers in the first insulating portion. This simplifies the structure and molding method of the first insulating portion and reduces its molding difficulty.

[0032] In some embodiments, the housing includes a first wall and two second walls, the two second walls being located on opposite sides of the electrode assembly along a second direction; the insulating member includes two first insulating portions and two second insulating portions, the two second insulating portions being disposed on the two second walls respectively, and the two first insulating portions being disposed on the first wall and respectively connected to the two second insulating portions. The two first insulating portions can insulate and isolate the first wall from other structures on both sides of the second direction, which is beneficial to improving the insulation protection effect of the insulating member.

[0033] 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, wherein the first, second, and third directions are mutually perpendicular; the insulating member includes a third insulating portion and a fourth insulating portion, the third insulating portion being disposed on the third wall and the fourth insulating portion being disposed on the first wall, the third insulating portion being connected to the second and fourth insulating portions, and at least a portion of the thickness of the fourth insulating portion being less than the thickness of the third insulating portion. This facilitates increasing the area of ​​the housing covered by the insulating member, thereby improving the insulating and protective effect of the insulating member.

[0034] 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.

[0035] 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

[0036] 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.

[0037] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0038] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application.

[0039] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0040] Figure 4 yes Figure 3 The diagram shows the exploded structure of a single battery cell.

[0041] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown.

[0042] Figure 6 yes Figure 5 Enlarged schematic diagram of region A in the middle.

[0043] Figure 7 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application.

[0044] Figure 8 yes Figure 7 A magnified view of region B in the middle.

[0045] Figure 9 This is an exploded structural diagram of the insulating component of a battery cell provided in some embodiments of this application.

[0046] Figure 10 This is a partial cross-sectional view of the insulating component of a battery cell provided in some embodiments of this application.

[0047] Figure 11 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in some embodiments of this application.

[0048] Figure 12 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in other embodiments of this application.

[0049] Figure 13 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in some embodiments of this application.

[0050] Figure 14 This is a schematic diagram of the structure of the first insulating part of a battery cell provided in some embodiments of this application.

[0051] Figure 15 This is a schematic diagram of the structure of the first insulating part of a battery cell provided in other embodiments of this application.

[0052] Figure 16 This is a schematic diagram of the structure of the first insulating part of a battery cell provided in some embodiments of this application.

[0053] Figure 17 This is a schematic diagram of the structure of the second insulating layer of a battery cell provided in some embodiments of this application.

[0054] Figure 18 This is a front view of a battery cell provided in some embodiments of this application.

[0055] Figure 19 It is along Figure 18 A cross-sectional view taken from the CC direction in the middle.

[0056] Figure 20 yes Figure 19 A magnified schematic diagram of region D in the middle.

[0057] Figure 21 This is a partial cross-sectional view of a battery cell provided in other embodiments of this application.

[0058] The attached figures are labeled as follows:

[0059] Vehicle 1, battery unit 2, controller 3, motor 4;

[0060] Box 5, first box section 5a, second box section 5b, and accommodating space 5c;

[0061] 6 battery cells;

[0062] Electrode assembly 10, main body 11, electrode tab 12;

[0063] Outer shell 20, housing 21, housing opening 211, end cap 22, first wall 23, first part 231, second part 232, surface 232a, bend 233, first recess 234, second wall 24, third wall 25, fourth wall 26.

[0064] Electrode terminal 30;

[0065] Insulating component 40, first insulating part 41, first insulating layer 411, first opening 4111, first insulating segment 4112, first base 4113, first insulator part 412, second insulator part 413, second insulating part 42, second insulating layer 421, second opening 4211, second insulating segment 4212, second base 4213, first adhesive layer 43, first bonding part 431, second bonding part 432, second adhesive layer 44, third bonding part 441, fourth bonding part 442, third insulating part 45, fourth insulating part 46, fifth insulating part 47;

[0066] First direction X, second direction Y, third direction Z. Detailed Implementation

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] In this application, "multiple" means two or more (including two).

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In some implementations, the separator is positioned between the positive and negative electrodes.

[0082] 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.

[0083] 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.

[0084] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0085] In some embodiments, the electrode assembly has a stacked structure.

[0086] 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.

[0087] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0092] Insulation between the battery cell casing and other structures within the battery cell, as well as insulation between multiple battery cells, is of paramount importance. Therefore, battery cell casings typically incorporate insulating components to provide insulation and protection, reducing the risk of short circuits between the casing and other structures.

[0093] In related technologies, an insulating component is located on one of the walls of the housing and folds towards the wall where the electrode terminals are located. This design can further improve insulation performance. However, due to the presence of the electrode terminals, the distance between the electrode terminals and the edge of the wall where they are located is limited, and the size of the portion of the insulating component folded towards that wall is small, making it prone to warping and affecting the insulation effect of the housing and other structures. During the stacking and assembly of multiple battery cells, the warped portion of the insulating component is also prone to misalignment under pressure, leading to insulation failure.

[0094] In view of this, the present application provides a technical solution that improves the ductility and deformability of the first insulating part by at least partially thinning the first insulating part located on the wall where the electrode terminal is located, so that the first insulating part fits better against the wall, which helps to improve the problem of the insulating part lifting, improves the insulation protection effect of the insulating part, and thus improves the reliability of the battery cell.

[0095] The technical solutions provided in this application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0096] 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.

[0097] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0098] Figure 1 This is a structural schematic diagram of a vehicle provided in some embodiments of this application. (Refer to...) Figure 1 Vehicle 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.

[0099] 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.

[0100] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application. (Refer to...) Figure 2The 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] For example, the battery cell 6 may be the smallest unit that makes up the battery device 2.

[0105] Figure 3 These are schematic diagrams of the structure of a single battery cell provided in some embodiments of this application. Figure 4 yes Figure 3 The diagram shows the exploded structure of a single battery cell. (Refer to...) Figure 3 and Figure 4 The battery cell 6 includes an electrode assembly 10 and a housing 20, with the electrode assembly 10 disposed inside the housing 20.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] As an example, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having a housing opening 211 and the end cap 22 for closing the housing opening 211.

[0110] 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.

[0111] The housing 21 and the end cap 22 can be separate components. For example, a housing opening 211 can be provided on the housing 21, and the end cap 22 can be used to cover the housing opening 211 to form an internal cavity of the battery cell 6.

[0112] 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.

[0113] The end cap 22 can be connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0114] 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.

[0115] Figure 5 yes Figure 3 The cross-sectional view of the battery cell shown. Figure 6 yes Figure 5An enlarged schematic diagram of region A in the middle. Figure 7 These are schematic diagrams of the structure of a battery cell provided in other embodiments of this application. Figure 8 yes Figure 7 An enlarged schematic diagram of region B in the middle. Figure 9 This is an exploded structural diagram of the insulating component of a battery cell provided in some embodiments of this application. Figure 10 This is a partial cross-sectional view of the insulating component of a battery cell provided in some embodiments of this application. Figure 11 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in some embodiments of this application. Figure 12 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in other embodiments of this application. Figure 13 This is a schematic diagram of the structure of the first insulating layer of a battery cell provided in some embodiments of this application. Figure 14 This is a schematic diagram of the structure of the first insulating portion of a battery cell provided in some embodiments of this application. Figure 15 This is a schematic diagram of the structure of the first insulating portion of a battery cell provided in other embodiments of this application. Figure 16 This is a schematic diagram of the structure of the first insulating portion of a battery cell provided in some embodiments of this application. Figure 17 This is a schematic diagram of the structure of the second insulating layer of a battery cell provided in some embodiments of this application. Figure 18 This is a front view of a battery cell provided in some embodiments of this application. Figure 19 It is along Figure 18 A sectional view taken from the CC direction in the middle. Figure 20 yes Figure 19 An enlarged schematic diagram of region D in the middle. Figure 21 This is a partial cross-sectional view of a battery cell provided in other embodiments of this application.

[0116] Reference Figures 3 to 21 This 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, which is perpendicular to the first direction X. The electrode terminals 30 are disposed on the first wall 23. The insulating member 40 is connected to the first wall 23 and the second wall 24. The insulating member 40 includes a first insulating portion 41 and a second insulating portion 42 that are connected to each other. The first insulating portion 41 is disposed on the first wall 23, and the second insulating portion 42 is disposed on the second wall 24. The thickness of at least a portion of the first insulating portion 41 is less than the thickness of at least a portion of the second insulating portion 42.

[0117] The first wall 23 can be one of the walls of the housing 21, or it can be an end cap 22. Optionally, in Figure 4In the embodiment shown, the first wall 23 is an end cap 22.

[0118] 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 one of the wall portions of the housing 21.

[0119] Optionally, the second direction Y is parallel to the thickness direction of the electrode assembly 10. The second wall 24 is the larger wall portion of the housing 20.

[0120] In some examples, at least a portion of the electrode terminal 30 protrudes beyond the outer surface of the first wall 23. In other examples, the electrode terminal 30 does not extend beyond the outer surface of the first wall 23 in the direction along which the electrode assembly 10 points toward the first wall 23.

[0121] The battery cell 6 includes a plurality of electrode terminals 30. Optionally, the plurality of electrode terminals 30 are spaced apart along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. At least one of the plurality of electrode terminals 30 is a positive terminal, and at least one of the plurality of electrode terminals 30 is a negative terminal.

[0122] The insulating component 40 can be connected to the first wall 23 and the second wall 24 by bonding, heat fusion or other suitable means. In the embodiments of this application, "bonding" can be by adhesive bonding or by using the adhesive properties of the component itself.

[0123] The insulating element 40 can be connected to the surfaces of the first wall 23 and the second wall 24 that are away from the electrode assembly 10, or it can be connected to the surfaces of the first wall 23 and the second wall 24 that face the electrode assembly 10.

[0124] In the same plane perpendicular to the first direction X, the orthographic projection of the first insulating portion 41 and the orthographic projection of the electrode terminal 30 do not overlap. The first insulating portion 41 does not obstruct the electrode terminal 30 and does not affect the connection between the electrode terminal 30 and other components.

[0125] Optionally, the first insulating portion 41 extends from one end of the first wall 23 along the third direction Z to the other end of the first insulating portion 41 along the third direction Z, to cover the entire edge surface of the first wall 23 near the second wall 24. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0126] The first insulating part 41 may include a single insulating layer or multiple insulating layers stacked together.

[0127] The second insulating portion 42 may include a single insulating layer or multiple insulating layers stacked together.

[0128] The first insulating part 41 and the second insulating part 42 can be integrally molded or connected by bonding or other suitable means.

[0129] The first insulating part 41 can be of equal thickness or unequal thickness. The second insulating part 42 can be of equal thickness or unequal thickness.

[0130] In some examples, the first insulating part 41 and the second insulating part 42 are both of equal thickness, and the overall thickness of the first insulating part 41 is less than the overall thickness of the second insulating part 42.

[0131] In other examples, the first insulating portion 41 has an unequal thickness structure, and the second insulating portion 42 has an equal thickness structure, wherein the thickness of a portion of the first insulating portion 41 is less than the thickness of the second insulating portion 42.

[0132] In some other examples, the first insulating portion 41 and the second insulating portion 42 are of unequal thickness, with a portion of the first insulating portion 41 having a thickness less than a portion of the second insulating portion 42.

[0133] The second insulating portion 42 has a relatively thick thickness and greater structural strength, which helps reduce the risk of the second insulating portion 42 being worn or punctured, and improves the insulation protection effect of the second insulating portion 42 on the second wall 24. The first insulating portion 41 has a relatively thin thickness and lower structural strength, which helps improve the ductility and deformability of the first insulating portion 41, improves the connection stability and reliability between the first insulating portion 41 and the first wall 23, improves the problem of the first insulating portion 41 warping, and improves the insulation protection effect of the insulating component 40, thereby improving the reliability of the battery cell 6.

[0134] In some embodiments, the insulating element 40 covers the side of the housing 20 away from the electrode assembly 10.

[0135] The first insulating part 41 is connected to the surface of the first wall 23 away from the electrode assembly 10. The second insulating part 42 is connected to the surface of the second wall 24 away from the electrode assembly 10.

[0136] The side of the housing 20 away from the electrode assembly 10 can be the outer side 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; for example, the insulating member 40 wraps around and covers a portion of the outer surface of the first wall 23 and at least a portion of the outer surface of the second wall 24. 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.

[0137] If the insulating component 40 located on the side of the outer casing 20 away from the electrode assembly 10 warps, it will not only affect the insulation performance between multiple battery cells 6, but may also encroach on the space of other components inside the battery device 2. For example, the warped insulating component 40 may occupy the installation space of components connected to the electrode terminals 30 (such as busbar components), resulting in poor connection or contact between the electrode terminals 30 and these components. During the production process of the battery device 2, the warped insulating component 40 may also interfere with the production tooling, increasing the complexity and difficulty of production. Therefore, it is urgent to solve the warping problem of the insulating component 40 on the side of the outer casing 20 away from the electrode assembly 10.

[0138] The insulating component 40 covers the side of the outer shell 20 away from the electrode assembly 10. After multiple battery cells 6 are stacked, it is not easy for adjacent battery cells 6 to make direct contact. It also helps to reduce electric field concentration, increase the creepage distance between adjacent battery cells 6, and improve the insulation performance between adjacent battery cells 6.

[0139] The first insulating part 41 is thinner, has better ductility and stronger deformation ability, and is less likely to lift off the first wall 23. This reduces the space occupied by the first insulating part 41, which is conducive to the reliable connection of the electrode terminal 30 and other components. It also helps to reduce the assembly difficulty of the battery device 2 and improve its assembly efficiency.

[0140] In some embodiments, refer to Figures 3 to 8 The electrode assembly 10 includes a main body 11 and a tab 12 connected to the main body 11. The first wall 23 includes a first portion 231, a second portion 232, and a bent portion 233. In the first direction X, the second portion 232 is closer to the main body 11 than the first portion 231, and the bent portion 233 connects the first portion 231 and the second portion 232. A portion of the first insulating portion 41 is connected to the bent portion 233, and its thickness is less than the thickness of the second insulating portion 42.

[0141] The bent portion 233 bends relative to the first portion 231 in a direction gradually approaching the main body portion 11. The bent portion 233 bends relative to the second portion 232 in a direction gradually moving away from the main body portion 11. The bent portion 233 extends from the first portion 231 to the second portion 232 in a direction gradually approaching the main body portion 11.

[0142] Optionally, the first part 231 and the second part 232 are arranged along the third direction Z, and the two ends of the bent part 233 in the third direction Z are respectively connected to the first part 231 and the second part 232.

[0143] The bent portion 233 is inclined relative to the first direction X and is not parallel to the first direction X. The insulating member 40 is connected to the first part 231, the second part 232 and the bent portion 233, which helps to improve the connection reliability between the insulating member 40 and the first wall 23.

[0144] The first insulating portion 41 includes multiple parts, one part of which is connected to the bending portion 233, another part is connected to the first portion 231, and a third part is connected to the second portion 232. At least the thickness of the portion of the first insulating portion 41 connected to the bending portion 233 is less than the thickness of the second insulating portion 42.

[0145] Optionally, the first portion 231 has a first region near the bend 233, and the thickness of the portion of the first insulating portion 41 connected to the first region is less than the thickness of the second insulating portion 42.

[0146] Optionally, the first portion 231 has a second region near the bend 233, and the thickness of the portion of the first insulating portion 41 connected to the second region is less than the thickness of the second insulating portion 42.

[0147] Because the first part 231 and the second part 232 are offset in the first direction X, forming a height difference, the insulating part 40 is prone to wrinkles forming at the position of the first part 231 near the bending part 233, and a hanging and lifting phenomenon occurs at the position of the second part 232 near the bending part 233.

[0148] The portion of the first insulating part 41 that connects to the bending part 233 is thinner. This portion is more likely to stretch and deform during the process of connecting to the bending part 233, which helps to reduce the phenomenon of wrinkles or suspension when the insulating part 40 is folded to the first wall 23, and improves the problem of the insulating part 40 lifting.

[0149] In some embodiments, refer to Figure 5 and Figure 6 Electrode terminals 30 are disposed in the second portion 232. A first recess 234 is formed on the side of the first wall 23 facing the electrode assembly 10. The first recess 234 is recessed relative to the surface 232a of the second portion 232 facing the electrode assembly 10, and the bottom surface of the first recess 234 corresponds to the first portion 231. At least a portion of the tab 12 is located on the side of the main body 11 facing the first wall 23. In the same plane perpendicular to the first direction X, the orthographic projection of the tab 12 is located within the orthographic projection of the first recess 234, and at least a portion of the tab 12 is accommodated in the first recess 234.

[0150] At least a portion of the electrode terminal 30 protrudes from the surface of the second portion 232 away from the main body portion 11. The portion of the electrode terminal 30 protruding from the second portion 232 can share a portion of the space in the first direction X with the housing 20, which is beneficial to improving space utilization and increasing the energy density of the battery cell 6.

[0151] The tab 12 can be entirely housed in the first recess 234, or only a portion of the tab 12 can be housed in the first recess 234. For example, the other portion of the tab 12 can be located on the side of the first recess 234 facing the main body 11.

[0152] Optionally, along the direction from the main body 11 to the first wall 23, a portion of the tab 12 protrudes from the surface of the electrode terminal 30 near the main body 11. The tab 12 and the electrode terminal 30 can share a portion of the space in the first direction X, which is beneficial for improving space utilization.

[0153] The first recess 234 is recessed relative to the surface 232a in a direction away from the main body 11. The first recess 234 can provide a receiving space and a buffer space for the tab 12, reducing the squeezing effect on the tab 12 and reducing the risk of the tab 12 breaking. The tab 12 can also share part of the space in the first direction X with the outer casing 20, which is beneficial to improving space utilization and increasing the energy density of the battery cell 6.

[0154] In some embodiments, refer to Figure 9 and Figure 10 The first insulating portion 41 includes a plurality of first insulating layers 411 stacked along a first direction X, each first insulating layer 411 connecting to the second insulating portion 42. At least one first insulating layer 411 has a first opening 4111, which penetrates the first insulating layer 411 along the first direction X. In the same plane perpendicular to the first direction X, the orthographic projection of the first opening 4111 of one first insulating layer 411 lies within the orthographic projection of the remaining at least one first insulating layer 411.

[0155] Two adjacent first insulating layers 411 are connected. For example, two adjacent first insulating layers 411 are connected by adhesive, attachment or other suitable means.

[0156] The materials of the multiple first insulating layers 411 can be the same or different.

[0157] Each first insulating layer 411 is connected to the second insulating portion 42 at one end in the second direction Y.

[0158] In some examples, the second insulating portion 42 includes a single second insulating layer, the thickness of which is greater than the thickness of the first insulating layer 411. One of the first insulating layers 411 (e.g., the first insulating layer 411 furthest from the first wall 23 in the first direction X) is integrally formed with the second insulating layer, and the remaining first insulating layers 411 are directly connected to the second insulating layer or indirectly connected to the second insulating layer through other structures (e.g., adhesive layers).

[0159] In other examples, the second insulating portion 42 includes a plurality of second insulating layers, the number of which may be greater than the number of first insulating layers 411, with each first insulating layer 411 correspondingly connected to a second insulating layer.

[0160] In some other examples, the second insulating portion 42 includes a plurality of second insulating layers, the number of which is equal to the number of first insulating layers 411, and the plurality of first insulating layers 411 are connected to the plurality of second insulating layers in a one-to-one correspondence.

[0161] In some examples, a portion of the plurality of first insulating layers 411 are provided with a first opening 4111. Exemplarily, only one first insulating layer 411 is provided with a first opening 4111, and the first insulating layer 411 can be any of the plurality of first insulating layers 411. Optionally, the first insulating layer 411 closest to the first wall 23 in the first direction X is provided with a first opening 4111.

[0162] In other examples, each first insulating layer 411 is provided with a first opening 4111.

[0163] The first insulating layer 411 includes a plurality of first openings 4111, and the structures of the plurality of first openings 4111 may be the same or different.

[0164] In some examples, refer to Figure 11 The first opening 4111 is a through hole. Along the second direction Y, the first opening 4111 does not penetrate the first insulating layer 411.

[0165] In other examples, refer to Figure 9 and Figure 12 The first opening 4111 is a notch. Along the second direction Y, the first opening 4111 extends to the edge of the first insulating layer 411 away from the second insulating portion 42.

[0166] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of a first opening 4111 in a first insulating layer 411 lies within the orthographic projection of an adjacent first insulating layer 411. Along the first direction X, the first opening 4111 in a first insulating layer 411 overlaps with the adjacent first insulating layer 411.

[0167] In some examples, only a portion of the first insulating layer 411 has the first opening 4111, and at least one first insulating layer 411 does not have the first opening 4111. In the same plane perpendicular to the first direction X, the orthographic projection of the first opening 4111 lies within the orthographic projection of the first insulating layer 411 without the first opening 4111.

[0168] In other examples, each first insulating layer 411 is provided with a first opening 4111. In the same plane perpendicular to the first direction X, the orthographic projections of the first openings 4111 of any two first insulating layers 411 do not overlap. Optionally, the orthographic projections of the first openings 4111 of adjacent first insulating layers 411 do not overlap.

[0169] In this embodiment, by providing a first opening 4111 in at least one first insulating layer 411, the portion of the first insulating part 41 corresponding to the first opening 4111 is thinner, making it easier to stretch and deform. This improves the reliability and stability of the connection between the first insulating part 41 and the first wall 23, and reduces the risk of the first insulating part 41 warping. Along the first direction X, the first opening 4111 overlaps with other first insulating layers 411, and the first insulating part 41 as a whole does not form an opening exposing the first wall 23, which helps to improve the insulation protection effect.

[0170] In some embodiments, refer to Figure 7 and Figure 8 The electrode assembly 10 includes a main body 11 and tabs 12 connected to the main body 11. The first wall 23 includes a first portion 231, a second portion 232, and a bent portion 233. In the first direction X, the second portion 232 is closer to the main body 11 than the first portion 231, and the bent portion 233 connects the first portion 231 and the second portion 232. In the same plane perpendicular to the first direction X, the orthographic projection of at least one first opening 4111 at least partially overlaps with the orthographic projection of the bent portion 233.

[0171] Optionally, in the same plane perpendicular to the first direction X, the orthographic projection of at least one first opening 4111 is located within the orthographic projection of the bend 233.

[0172] Along the first direction X, the portion of the first insulating part 41 corresponding to at least one first opening 4111 covers the bent part 233. During the connection between the first insulating part 41 and the first wall 23, the first opening 4111 corresponding to the bent part 233 can expand in the third direction Z. This facilitates the extension and deformation of the portion of the first insulating part 41 covering the bent part 233 along the third direction Z, thereby extending the dimension of this portion in the third direction Z to better fit the shape of the bent part 233, thus improving the connection reliability between this portion and the bent part 233 and reducing the risk of this portion warping.

[0173] In some embodiments, refer to Figures 7 to 9 One end of the first opening 4111 extends to the edge of the first insulating layer 411 away from the second insulating portion 42. In other words, the first opening 4111 penetrates the edge of the first insulating layer 411 away from the second insulating portion 42.

[0174] The first opening 4111 can be a narrow and elongated opening. The smaller dimension of the first opening 4111 along the third direction Z is beneficial to reducing the impact of the first opening 4111 on the overall strength and insulation effect of the first insulating part 41.

[0175] In some examples, refer to Figure 9 The first opening 4111 extends straight along the second direction Y. In other examples, refer to... Figure 12 The first opening 4111 extends at an angle relative to the second direction Y.

[0176] The first opening 4111 is open at the end away from the second insulating part 42, forming a notch. This helps to reduce the restriction on the first opening 4111 and makes it easier for the first opening 4111 to open, increasing the degree of stretchability and deformation of the first insulating part 41, thereby further reducing the risk of warping. The notch shape of the first opening 4111 also reduces the possibility of wrinkles appearing in the first insulating layer 411 during stretching and deformation.

[0177] In some embodiments, refer to Figure 9 The other end of the first opening 4111 extends to the second insulating part 42.

[0178] The first opening 4111 can extend to the edge of the first wall 23 near the second wall 24. The extended length of the first opening 4111 is relatively long, which is beneficial to increase the expansion distance of the first opening 4111 and increase the degree of stretchability and deformation of the first insulating part 41, thereby further reducing the risk of warping.

[0179] In some embodiments, refer to Figures 12 to 16 The first insulating layer 411 with a first opening 4111 includes a plurality of first insulating segments 4112. The plurality of first insulating segments 4112 are spaced apart along the third direction Z. A first opening 4111 is formed between two adjacent first insulating segments 4112. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0180] The dimensions of the multiple first insulating segments 4112 in the second direction Y can be the same or different.

[0181] The dimensions of the multiple first insulating segments 4112 in the third direction Z can be the same or different.

[0182] In some examples, refer to Figure 9 Each of the first insulating sections 4112 is directly connected to the second insulating part 42.

[0183] In other examples, refer to Figure 13The first insulating layer 411, which has a first opening 4111, also includes a first base 4113, which connects each of the first insulating segments 4112 and the second insulating portion 42. The first opening 4111 extends to the first base 4113 at one end near the second insulating portion 42.

[0184] Multiple first insulating segments 4112 are separated by a first opening 4111. The spacing between two adjacent first insulating segments 4112 can vary slightly within an appropriate range, which is beneficial to the extension and deformation of the first insulating part 41 and reduces its risk of warping.

[0185] In some embodiments, refer to Figure 12 The first opening 4111 extends at an angle relative to the second direction Y.

[0186] Optionally, the angle α between the extension direction of the first opening 4111 and the second direction Y can be 5°-45°. For example, the angle α can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45° or any value between any two of them.

[0187] The first opening 4111 extends obliquely relative to the second direction Y. The connection between the portion of the first insulating layer 411 separated by the first opening 4111 (e.g., the first insulating segment 4112) and other portions of the first insulating layer 411 (e.g., the first base 4113) or the second insulating portion 42 is relatively gentle, which helps to reduce the risk of the first insulating layer 411 tearing at the first opening 4111.

[0188] For example, before the insulating element 40 is assembled to the housing 20, the insulating element 40 may be covered with release paper to reduce the risk of the insulating element 40 being contaminated by dust, metal particles or other impurities. The first opening 4111 extends obliquely relative to the second direction Y, and the release paper can be torn off along the oblique direction of the first opening 4111, reducing the risk of the first insulating layer 411 in contact with the release paper tearing at the first opening 4111.

[0189] In some embodiments, refer to Figure 9 , Figures 14 to 16 Each of two adjacent first insulating layers 411 is provided with multiple first openings 4111. The first openings 4111 of one first insulating layer 411 and the first openings 4111 of the other first insulating layer 411 are spaced apart along the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. That is, the first openings 4111 of one first insulating layer 411 and the first openings 4111 of the other first insulating layer 411 are completely offset along the third direction Z.

[0190] Multiple first openings 4111 of the same first insulating layer 411 are spaced apart along the third direction Z, which is beneficial for the first insulating layer 411 to produce relatively balanced extension deformation in the third direction Z, and reduces the risk of local stress tearing of the first insulating layer 411 during the extension process.

[0191] The number of first openings 4111 in two adjacent first insulating layers 411 can be the same or different.

[0192] On the third direction Z, a first opening 4111 of another first insulating layer 411 may be provided between two adjacent first openings 4111 of a first insulating layer 411, or multiple first openings 4111 of another first insulating layer 411 may be provided.

[0193] The first openings 4111 of two adjacent first insulating layers 411 are completely offset along the third direction Z, and the first openings 4111 of two adjacent first insulating layers 411 do not overlap in the first direction X. The first insulating part 41 will not form an opening that exposes the first wall 23, and the local thickness of the first insulating part 41 will not be too thin to affect its structural strength. This helps to reduce the risk of the first insulating part 41 tearing during the stretching and deformation process, thereby improving the insulation and protection effect of the first insulating part 41.

[0194] In some embodiments, refer to Figure 14 and Figure 15 In two adjacent first insulating layers 411, each having a first opening 4111, the first opening 4111 of one first insulating layer 411 and the first opening 4111 of the other first insulating layer 411 are alternately arranged along the third direction Z.

[0195] The multiple first openings 4111 of each first insulating layer 411 are not concentrated in a local area of ​​the first insulating layer 411, which helps to improve the balance of the elongation and deformation capacity of different areas of the first insulating part 41, and reduces the possibility of some first insulating layers 411 breaking due to the elongation tension of other first insulating layers 411, thereby improving the strength of the first insulating part 41 and improving the insulation and protection effect of the first insulating part 41.

[0196] In some embodiments, refer to Figure 14 Along the third direction Z, multiple first openings 4111 of the same first insulating layer 411 are equally spaced along the third direction Z. In two adjacent first insulating layers 411, the spacing between two adjacent first openings 4111 of one first insulating layer 411 is the same as the spacing between two adjacent first openings 4111 of the other first insulating layer 411.

[0197] Along the third direction Z, the first openings 4111 of two adjacent first insulating layers 411 can be set at equal intervals or at unequal intervals.

[0198] Multiple first insulating layers 411 can be cut from a strip of insulating material, which helps to improve the production efficiency of the first insulating layer 411. After two adjacent first insulating layers 411 are stacked, the possibility of the first openings 4111 of the two adjacent first insulating layers 411 overlapping in the first direction X is also reduced, which helps to improve the production yield of the insulating component 40. For example, even if the first openings 4111 of two adjacent first insulating layers 411 are not equidistantly spaced, the first openings 4111 of the two adjacent first insulating layers 411 are not likely to overlap, which helps to improve the flexibility of the relative position of the two adjacent first insulating layers 411 and improve production efficiency.

[0199] In some embodiments, along a third direction Z, the first opening 4111 of one first insulating layer 411 is equally spaced from the first opening 4111 of the other first insulating layer 411.

[0200] In other words, in the same plane perpendicular to the first direction X, the orthographic projections of all the first openings 4111 of two adjacent first insulating layers 411 are equally spaced along the third direction Z.

[0201] The embodiments of this application are beneficial to improving the uniformity of the distribution of the first opening 4111, improving the extension deformation effect of the first insulating portion 41, and reducing the risk of local stress concentration and fracture of the first insulating portion 41. The more uniform distribution of the first opening 4111 also helps to reduce the risk of overlap of the first openings 4111 of two adjacent first insulating layers 411 along the first direction X after the first insulating portion 41 is extended and deformed.

[0202] In some embodiments, refer to Figure 11 At least one first insulating layer 411 includes a plurality of first openings 4111 spaced apart along the third direction Z. The distance between two adjacent first openings 4111 of the same first insulating layer 411 along the third direction Z is d1, where 1mm≤d1≤5mm.

[0203] Optionally, d1 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, or any value between any two of these.

[0204] In this embodiment, d1 is set to be greater than or equal to 1 mm. The portion of the first insulating layer 411 located between the two first openings 4111 has a larger dimension. In the first direction X, the first opening 4111 of the first insulating layer 411 is less likely to overlap with the first opening 4111 of the adjacent first insulating layer 411, which is beneficial to improving the insulation protection effect. In this embodiment, d1 is set to be less than or equal to 5 mm, which is beneficial to improving the extensibility and deformation capability of the first insulating portion 41, improving the connection effect between the first insulating portion 41 and the first wall 23, and reducing the risk of the first insulating portion 41 warping.

[0205] In some embodiments, among the plurality of first insulating layers 411, the first insulating layer 411 furthest from the first wall 23 does not have a first opening 4111.

[0206] The first insulating layer 411 furthest from the first wall 23 is continuous and complete. This first insulating layer 411 can cover the first opening 4111 of the other first insulating layers 411, and can also cover other structures (such as adhesive layers) between adjacent first insulating layers 411 and between the first insulating layer 411 and the first wall 23, reducing the possibility of dust, metal particles and other impurities embedded in the first insulating part 41, and reducing the risk of the first insulating part 41 being worn by impurities and failing to provide insulation.

[0207] In some embodiments, the elongation of the first insulating layer 411 furthest from the first wall 23 is greater than the elongation of the other first insulating layers 411.

[0208] Optionally, the structural strength of the first insulating layer 411 furthest from the first wall 23 is less than that of the other first insulating layers 411, so as to improve the overall structural strength of the first insulating part 41.

[0209] Optionally, the material of the first insulating layer 411 furthest from the first wall 23 includes polypropylene. Other materials of the first insulating layer 411 include polyethylene terephthalate.

[0210] The first insulating layer 411 furthest from the first wall 23 has a larger elongation rate and stronger stretching and deformation capacity, which is beneficial for adapting to the stretching and deformation of other first insulating layers 411 and reducing the risk of the first insulating layer 411 furthest from the first wall 23 breaking without the first opening 4111.

[0211] In some embodiments, refer to Figures 7 to 9 The second insulating portion 42 includes a plurality of second insulating layers 421 stacked along the second direction Y, and the plurality of second insulating layers 421 and the plurality of first insulating layers 411 are disposed in a one-to-one correspondence. The corresponding first insulating layers 411 and second insulating layers 421 are integrally formed.

[0212] The number of second insulating layers 421 is the same as the number of first insulating layers 411.

[0213] The thickness of the first insulating layer 411 and the second insulating layer 421 are the same.

[0214] The first insulating layer 411 and the second insulating layer 421 are integrally formed, making it less prone to cracking at their junction. This improves the structural strength of the insulating component 40, reduces the risk of breakage at the connection between the first insulating part 41 and the second insulating part 42 after the first insulating part 41 is folded over to the first wall 23, and enhances the insulation protection effect of the insulating component 40. Furthermore, it simplifies the structure and forming method of the insulating component 40.

[0215] In some embodiments, a second insulating layer 421 connected to a first insulating layer 411 having a first opening 4111 has a second opening 4211. The second opening 4211 penetrates the second insulating layer 421 along the second direction Y. One end of the second opening 4211 is connected to the first opening 4111 of the corresponding first insulating layer 411, and the other end is spaced apart from the edge of the second insulating layer 421 away from the first insulating portion 41.

[0216] Optionally, the second insulating layer 421 includes a second base 4213 and a plurality of second insulating segments 4212 spaced apart along a third direction Z. One end of each second insulating segment 4212 is connected to a corresponding first insulating layer 411, and the other end is connected to the second base 4213. A second opening 4211 is formed between two adjacent second insulating segments 4212. The end of the second opening 4211 away from the first insulating portion 41 extends to the second base 4213.

[0217] In the same plane perpendicular to the second direction Y, the orthographic projection of the second opening 4211 of one second insulating layer 421 lies within the orthographic projection of at least one other second insulating layer 421. Optionally, in the same plane perpendicular to the second direction Y, the orthographic projection of the second opening 4211 of one second insulating layer 421 lies within the orthographic projection of an adjacent second insulating layer 421.

[0218] Optionally, the second insulating layer 421 connected to the first insulating layer 411, which does not have a first opening 4111, does not have a second opening 4211.

[0219] The second opening 4211 extends to the first insulating portion 41 near the first wall 23 and communicates with a corresponding first opening 4111.

[0220] The second opening 4211 and the first opening 4111 are connected. The arrangement of multiple second openings 4211 in the same second insulating layer 421 and the arrangement of second openings 4211 in two adjacent second insulating layers 421 are the same, and will not be described again here.

[0221] The integrally formed first insulating layer 411 and second insulating layer 421 can form the first opening 4111 and the second opening 4211 in the same manufacturing process. For example, the integrally formed first insulating layer 411 and second insulating layer 421 can simultaneously form the first opening 4111 and the second opening 4211 by cutting.

[0222] The second opening 4211 does not extend to the edge of the second insulating layer 421 away from the first insulating portion 41. The second opening 4211 is provided only in the portion of the second insulating layer 421 near the first wall 23. The portion of the second insulating layer 421 away from the first wall 23 can be a continuous and complete structure, which is beneficial to improving the structural strength of the second insulating portion 42 and reducing the risk of insulation failure caused by puncture or wear.

[0223] The portion of the second insulating part 42 corresponding to the second opening 4211 is thinner and has lower strength, making it easier to stretch and deform. This facilitates the first insulating part 41 to be folded more smoothly onto the first wall 23, and also reduces the pulling effect of the second insulating part 42 on the first insulating part 41, improving the reliability and stability of the connection between the first insulating part 41 and the first wall 23, and reducing the risk of the first insulating part 41 warping.

[0224] The second opening 4211 connects to the first opening 4111. The portion of the insulating part 40 separated by the first opening 4111 and the second opening 4211 is pre-connected to the second wall 24, which helps to reduce the risk of the first insulating part 41 being torn at the first opening 4111 during the process of folding the first insulating part 41 to the first wall 23.

[0225] In some embodiments, refer to Figure 17 The length of the second opening 4211 in its own extension direction is L, 0.5mm≤L≤10mm.

[0226] L is the extension length of the second opening 4211. Optionally, the second opening 4211 extends in a straight line.

[0227] In some examples, the extension direction of the second opening 4211 is parallel to the first direction X. L is the dimension of the second opening 4211 in the first direction X.

[0228] In other examples, the extension direction of the second opening 4211 is inclined relative to the first direction X, and L is the dimension of the two ends of the second opening 4211 in its extension direction.

[0229] Optionally, L is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm or any value between two of these.

[0230] In this embodiment, setting L to be greater than or equal to 0.5 mm increases the size of the thinned portion of the second insulating part 42, which is more conducive to the folding of the first insulating part 41, making the effect of improving the warping phenomenon of the first insulating part 41 more obvious. In this embodiment, setting L to be less than or equal to 10 mm helps to reduce the impact of the setting of the second opening 4211 on the overall structural strength of the second insulating part 42, and improves the insulation and protection effect of the second insulating part 42.

[0231] In some embodiments, refer to Figure 17 The second opening 4211 extends obliquely relative to the first direction X. The oblique angle of the first opening 4111 relative to the second direction Y is the same as the oblique angle of the second opening 4211 relative to the first direction X.

[0232] Optionally, when the first insulating part 41 is in the unfolded state, the first opening 4111 and the second opening 4211 do not form an angle.

[0233] The second opening 4211 extends obliquely relative to the first direction X. The connection between the portion of the second insulating layer 421 separated by the second opening 4211 (e.g., the second insulating segment 4212) and the other portions of the second insulating layer 421 (e.g., the second base 4213) is relatively gentle, which helps to reduce the risk of the second insulating layer 421 tearing at the second opening 4211.

[0234] For example, before the insulating element 40 is assembled to the housing 20, the insulating element 40 may be covered with release paper. During assembly, the release paper can be peeled off along the inclined direction of the second opening 4211, reducing the risk of the second insulating layer 421 in contact with the release paper tearing at the second opening 4211.

[0235] In some embodiments, refer to Figure 9 and Figure 10 The insulating component 40 includes a first adhesive layer 43, which includes a first adhesive portion 431 and a second adhesive portion 432. The first adhesive portion 431 adheres to two adjacent first insulating layers 411, and the second adhesive portion 432 adheres to two adjacent second insulating layers 421. The first insulating portion 41 includes the first adhesive portion 431, and the second insulating portion 42 includes the second adhesive portion 432.

[0236] At least a portion of the first adhesive portion 431 is located between two adjacent first insulating layers 411. Optionally, a portion of the first adhesive portion 431 may be located within the first opening 4111, for example, a portion of the first adhesive portion 431 may enter the first opening 4111 under the compression of two adjacent first insulating layers 411.

[0237] At least a portion of the second adhesive portion 432 is located between two adjacent second insulating layers 421. Optionally, a portion of the second adhesive portion 432 may be located within the second opening 4211, for example, a portion of the second adhesive portion 432 may enter the second opening 4211 under the compression of two adjacent second insulating layers 421.

[0238] Adhesive bonding of two adjacent first insulating layers 411 and two adjacent second insulating layers 421 is beneficial to improving the connection strength and reliability between the layers of the first insulating part 41 and between the layers of the second insulating part 42, thereby improving the structural stability of the insulating component 40.

[0239] In some embodiments, refer to Figure 9 and Figure 10 The insulating component 40 includes a second adhesive layer 44, which includes a third adhesive portion 441 and a fourth adhesive portion 442. The third adhesive portion 441 adheres to the first wall 23 and the first insulating layer 411 closest to the first wall 23, and the fourth adhesive portion 442 adheres to the second wall 24 and the second insulating layer 421 closest to the second wall 24. The first insulating portion 41 includes the third adhesive portion 441, and the second insulating portion 42 includes the fourth adhesive portion 442.

[0240] At least a portion of the third adhesive portion 441 is located between the first wall 23 and the first insulating layer 411 closest to the first wall 23. Optionally, a portion of the third adhesive portion 441 may be located within the first opening 4111, for example, a portion of the third adhesive portion 441 may enter the first opening 4111 under the compression of the first wall 23 and the first insulating layer 411 closest to the first wall 23.

[0241] At least a portion of the fourth adhesive portion 442 is located between the second wall 24 and the second insulating layer 421 closest to the second wall 24. Optionally, a portion of the fourth adhesive portion 442 may be located within the second opening 4211, for example, a portion of the fourth adhesive portion 442 may enter the second opening 4211 under the compression of the second wall 24 and the second insulating layer 421 closest to the second wall 24.

[0242] The bonding of the first insulating layer 411 and the first wall 23, and the bonding of the second insulating layer 421 and the second wall 24, helps to improve the connection strength and reliability between the first insulating part 41 and the first wall 23, and between the second insulating part 42 and the second wall 24, thereby improving the connection firmness between the insulating part 40 and the outer shell 20.

[0243] In some embodiments, refer to Figure 20The first insulating portion 41 includes a first insulator portion 412 and a second insulator portion 413, and the second insulator portion 413 connects the first insulator portion 412 and the second insulating portion 42. The thickness of the first insulator portion 412 is less than the thickness of the second insulator portion 413 and the thickness of the second insulating portion 42.

[0244] The second insulator part 413 is connected to the first insulator part 412 and the second insulator part 42 at both ends along the second direction Y.

[0245] Optionally, the thickness of the second insulator portion 413 is less than or equal to the thickness of the second insulator portion 42.

[0246] Optionally, the first insulator portion 412, the second insulator portion 413, and the second insulator portion 42 are all of equal thickness.

[0247] The first insulator portion 412 may include a single insulating layer or multiple insulating layers. The second insulator portion 413 may include a single insulating layer or multiple insulating layers. The second insulating portion 42 may include a single insulating layer or multiple insulating layers.

[0248] Optionally, the first insulator portion 412, the second insulator portion 413, and the second insulator portion 42 each include a single insulating layer, and the insulating layers of the first insulator portion 412, the second insulator portion 413, and the second insulator portion 42 are integrally formed.

[0249] In the second direction Y, the first insulator portion 412 is further away from the second insulator portion 42 than the second insulator portion 413. The first insulator portion 412 is thinner, more flexible, and easier to stretch and deform, which helps improve the connection stability and reliability between the first insulator portion 412 and the first wall 23, and reduces the risk of the first insulator portion 41 warping. The overall thinning of the first insulator portion 412 results in lower structural strength, making it prone to breakage and insulation failure. Therefore, the first insulator portion 41 also includes a thicker second insulator portion 413. The second insulator portion 413 has higher strength, which helps reduce the risk of insulation failure of the first insulator portion 41, and also helps reduce the risk of breakage of the insulating component 40 at the connection point between the first wall 23 and the second wall 24, improving the insulation protection effect of the insulating component 40.

[0250] In some embodiments, refer to Figure 20 Along the second direction Y, the distance between the first insulator part 412 and the second wall 24 is d2, 0.2mm≤d2≤3mm.

[0251] Optionally, d2 is 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, or any value between any two of these.

[0252] In this embodiment, setting d2 to be greater than or equal to 0.2 mm increases the size of the second insulator portion 413 in the second direction Y, increases the area of ​​the first wall 23 covered by the second insulator portion 413, and reduces the risk that the first insulating portion 41 will not be able to effectively insulate the first wall 23 after the first insulator portion 412 breaks. In this embodiment, setting d2 to be less than or equal to 3 mm is beneficial for increasing the size of the first insulator portion 412 in the second direction Y within a limited area, increasing the degree of extensibility and deformation of the first insulator portion 412, and improving the effect of preventing the first insulating portion 41 from warping.

[0253] In some embodiments, refer to Figure 20 The thickness of the first insulator part 412 is h1, and the thickness of the second insulator part 42 is h2, with 0.3 ≤ h1 / h2 ≤ 0.6.

[0254] Optionally, h1 / h2 is 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6 or any two of these values.

[0255] In this embodiment, h1 / h2 is set to be greater than or equal to 0.3, so that the thickness difference between the first insulator portion 412 and the second insulator portion 42 is not too large, which helps to reduce the risk of cracking or breaking of the first insulator portion 412. In this embodiment, h1 / h2 is set to be less than or equal to 0.6, which is beneficial to the elongation and deformation of the first insulator portion 412 and reduces the risk of the first insulator portion 41 warping.

[0256] In some embodiments, refer to Figure 21 The first insulating portion 41 includes at least one first insulating layer 411. The second insulating portion 42 includes a plurality of second insulating layers 421 stacked along the second direction Y, wherein the number of first insulating layers 411 is less than the number of second insulating layers 421, and each first insulating layer 411 is connected to a corresponding second insulating layer 421.

[0257] The first insulating layer 411 and the second insulating layer 421 that are interconnected have the same thickness.

[0258] Optionally, each first insulating layer 411 is integrally formed with a corresponding second insulating layer 421.

[0259] Optionally, the first insulating portion 41 includes a first insulating layer 411, and the second insulating portion 42 includes two second insulating layers 421. The first insulating layer 411 can be connected to either of the second insulating layers 421. For example, the first insulating layer 411 is connected to the second insulating layer 421 closest to the second wall 24, which facilitates a better fit between the insulating member 40 and the housing 20 and reduces any possible gaps between them.

[0260] The number of insulating layers in the first insulating part 41 is less than the number of insulating layers in the second insulating part 42. That is, by reducing the number of insulating layers in the first insulating part 41, the thickness of the first insulating part 41 is reduced, which helps to simplify the structure and molding method of the first insulating part 41 and reduce its molding difficulty.

[0261] In some embodiments, refer to Figure 4 The outer casing 20 includes a first wall 23 and two second walls 24, which are located on both sides of the electrode assembly 10 along the second direction Y. The insulating member 40 includes two first insulating portions 41 and two second insulating portions 42, which are respectively disposed on the two second walls 24, and the two first insulating portions 41 are each disposed on the first wall 23 and respectively connected to the two second insulating portions 42.

[0262] Optionally, the two second insulating portions 42 respectively cover the entire outer surface of the two second walls 24 to improve the insulating protection effect of the insulating member 40 on the two second walls 24.

[0263] Two first insulating portions 41 respectively cover two edge regions of the first wall 23 along the second direction Y. The surface areas of the two first insulating portions 41 covering the first wall 23 may be the same or different. Optionally, the two first insulating portions 41 are symmetrically arranged along the second direction Y.

[0264] The two second walls 24 are respectively insulated and isolated from other structures by the two second insulating parts 42. The two first insulating parts 41 can insulate and isolate the first wall 23 from other structures on both sides of the second direction Y, which is beneficial to improving the insulation protection effect of the insulating component 40.

[0265] In some embodiments, refer to Figure 4 and Figure 7 The housing 20 includes a third wall 25 located on one side of the electrode assembly 10 along the third direction Z and connected to the first wall 23 and the second wall 24. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular. The insulating member 40 includes a third insulating portion 45 and a fourth insulating portion 46. The third insulating portion 45 is disposed on the third wall 25, and the fourth insulating portion 46 is disposed on the first wall 23. The third insulating portion 45 is connected to the second insulating portion 42 and the fourth insulating portion 46, and at least a portion of the thickness of the fourth insulating portion 46 is less than the thickness of the third insulating portion 45.

[0266] Optionally, the third wall 25 is one of the walls of the housing 21.

[0267] The third insulating part 45 may cover the outer surface of the third wall 25. The fourth insulating part 46 may be connected to the area of ​​the first wall 23 along the third direction Z close to the third wall 25, and cover part of the outer surface of the first wall 23.

[0268] The third insulating portion 45 may be connected to the edge of the second insulating portion 42 along the third direction Z near the third wall 25. The fourth insulating portion 46 may be connected to the edge of the third insulating portion 45 along the first direction X near the first wall 23. The fourth insulating portion 46 may extend from one end of the first wall 23 along the second direction Y to the other end of the first wall 23 along the second direction Y, so as to cover the outer surface of the entire edge of the first wall 23 near the third wall 25.

[0269] Optionally, the structure of the third insulating part 45 is the same as that of the second insulating part 42, which will not be described in detail here.

[0270] Optionally, the structure of the fourth insulating part 46 is the same as that of the first insulating part 41, which will not be described in detail here.

[0271] In this embodiment, by connecting a third insulating part 45 to the third wall 25 of the outer shell 20 and connecting a fourth insulating part 46 to the area of ​​the first wall 23 near the third wall 25, it is beneficial to increase the area of ​​the outer shell 20 covered by the insulating member 40 and improve the insulation protection effect of the insulating member 40.

[0272] In some embodiments, the housing 20 includes two third walls 25, which are respectively located on both sides of the electrode assembly 10 along the third direction Z. The insulating member 40 includes two third insulating portions 45 and two fourth insulating portions 46. The two third insulating portions 45 are respectively disposed on the two third walls 25, and the two fourth insulating portions 46 are respectively connected to the two third insulating portions 45. One of the third insulating portions 45 includes two third insulator portions, which are at least partially stacked and interconnected along the third direction Z.

[0273] Alternatively, the two third insulator parts may be connected by adhesive bonding or other suitable methods.

[0274] In some embodiments, refer to Figure 19 The outer casing 20 includes a fourth wall 26, which is disposed along a first direction X with the first wall 23. The fourth wall 26 is connected to the second wall 24 and the third wall 25. The insulating member 40 includes a fifth insulating portion 47, which is disposed on the fourth wall 26 and connected to the second insulating portion 42. Optionally, the fifth insulating portion 47 is also connected to the third insulating portion 45. The fifth insulating portion 47 may cover a portion of the outer surface of the fourth wall 26.

[0275] 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 second walls 24 and two third walls 25 of the housing 20, with the beginning and end of the insulating member 40 partially overlapping and connecting on one of the third walls 25 along the winding direction. The portion of the insulating member 40 connected to the second wall 24 forms a second insulating portion 42, and the portion of the insulating member 40 connected to the third wall 25 forms a third insulating portion 45. At this time, along the direction of the electrode assembly 10 pointing towards the first wall 23, a portion of the insulating member 40 may extend beyond the second wall 24, 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 second wall 24 and connecting it to the first wall 23 forms a first insulating portion 41, and folding the portion of the insulating member 40 extending beyond the third wall 25 and connecting it to the first wall 23 forms a fourth insulating portion 46. Along the direction of the electrode assembly 10 pointing towards the fourth wall 26, a portion of the insulating member 40 may extend beyond the second wall 24, and another portion of the insulating member 40 may extend beyond the third wall 25. The portions of the insulating member 40 extending beyond the second wall 24 and the portions extending beyond the third wall 25 are folded over and connected to the fourth wall 26 to form the fifth insulating portion 47.

[0276] 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.

[0277] 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.

[0278] 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 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 first wall 23. 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 a first insulating portion 41 and a second insulating portion 42 that are connected to each other. The first insulating portion 41 is disposed on the first wall 23, and the second insulating portion 42 is disposed on the second wall 24. The thickness of at least a portion of the first insulating portion 41 is less than the thickness of at least a portion of the second insulating portion 42. The first wall 23 includes a first portion 231, a second portion 232, and a bent portion 233. In the first direction X, the second portion 232 is closer to the electrode assembly 10 than the first portion 231, and the bent portion 233 connects the first portion 231 and the second portion 232. A portion of the first insulating portion 41 is connected to the bent portion 233, and its thickness is less than that of the second insulating portion 42. The first insulating portion 41 includes a plurality of first insulating layers 411 stacked along the first direction X, and each first insulating layer 411 is connected to the second insulating portion 42. Each first insulating layer 411 has a first opening 4111 that penetrates the first insulating layer 411 along the first direction X. The first openings 4111 of two adjacent first insulating layers 411 are spaced apart along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0279] 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 by, include: Electrode assembly; The housing contains the electrode assembly. The housing 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, which is perpendicular to the first direction. Electrode terminals are disposed on the first wall; as well as An insulating element is connected to the first wall and the second wall. The insulating element includes a first insulating portion and a second insulating portion connected to each other. The first insulating portion is disposed on the first wall, and the second insulating portion is disposed on the second wall. The thickness of at least a portion of the first insulating portion is less than the thickness of at least a portion of the second insulating portion.

2. The battery cell according to claim 1, characterized in that, The insulating element covers the side of the housing away from the electrode assembly.

3. The battery cell according to claim 1 or 2, characterized in that, The electrode assembly includes a main body and electrode tabs connected to the main body; The first wall includes a first part, a second part, and a bend, wherein in the first direction, the second part is closer to the main body than the first part, and the bend connects the first part and the second part; A portion of the first insulating part is connected to the bent part, and its thickness is less than that of the second insulating part.

4. The battery cell according to claim 3, characterized in that, The electrode terminals are located in the second part; A first recess is formed on the side of the first 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. At least a portion of the tab is located on the side of the main body facing the first wall. In the same plane perpendicular to the first direction, the orthographic projection of the tab is located within the orthographic projection of the first recess, and at least a portion of the tab is accommodated in the first recess.

5. The battery cell according to any one of claims 1-4, characterized in that, The first insulating portion includes a plurality of first insulating layers stacked along the first direction, and each first insulating layer is connected to the second insulating portion; At least one of the first insulating layers has a first opening that penetrates the first insulating layer along the first direction. In the same plane perpendicular to the first direction, the orthographic projection of the first opening in one of the first insulating layers lies within the orthographic projection of the remaining at least one of the first insulating layers.

6. The battery cell according to claim 5, characterized in that, The electrode assembly includes a main body and electrode tabs connected to the main body; The first wall includes a first part, a second part, and a bend, wherein in the first direction, the second part is closer to the main body than the first part, and the bend connects the first part and the second part; In the same plane perpendicular to the first direction, the orthographic projection of at least one of the first openings at least partially overlaps with the orthographic projection of the bend.

7. The battery cell according to claim 5 or 6, characterized in that, One end of the first opening extends to the edge of the first insulating layer away from the second insulating portion.

8. The battery cell according to claim 7, characterized in that, The other end of the first opening extends to the second insulating portion.

9. The battery cell according to any one of claims 5-8, characterized in that, The first insulating layer with the first opening includes a plurality of first insulating segments, which are spaced apart along a third direction. The first opening is formed between two adjacent first insulating segments, and the first direction, the second direction, and the third direction are perpendicular to each other.

10. The battery cell according to any one of claims 5-9, characterized in that, The first opening extends at an angle relative to the second direction.

11. The battery cell according to any one of claims 5-10, characterized in that, Each of two adjacent first insulating layers is provided with a plurality of first openings, wherein the first opening of one first insulating layer and the first opening of the other first insulating layer are spaced apart along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

12. The battery cell according to claim 11, characterized in that, In two adjacent first insulating layers that are both provided with the first opening, the first opening of one first insulating layer and the first opening of the other first insulating layer are alternately arranged along the third direction.

13. The battery cell according to claim 12, characterized in that, Along the third direction, a plurality of first openings in the same first insulating layer are equally spaced along the third direction; In two adjacent first insulating layers, the spacing between two adjacent first openings in one first insulating layer is the same as the spacing between two adjacent first openings in the other first insulating layer.

14. The battery cell according to claim 12 or 13, characterized in that, Along the third direction, the first opening of one of the first insulating layers is equally spaced from the first opening of the other first insulating layer.

15. The battery cell according to any one of claims 5-14, characterized in that, At least one first insulating layer is provided with a plurality of first openings spaced apart along a third direction, and the distance between two adjacent first openings of the same first insulating layer along the third direction is d1, 1mm≤d1≤5mm, and the first direction, the second direction and the third direction are perpendicular to each other.

16. The battery cell according to any one of claims 5-10, characterized in that, Of the plurality of first insulating layers, the first insulating layer furthest from the first wall does not have the first opening.

17. The battery cell according to claim 16, characterized in that, The elongation of the first insulating layer furthest from the first wall is greater than the elongation of the other first insulating layers.

18. The battery cell according to any one of claims 5-17, characterized in that, The second insulating portion includes a plurality of second insulating layers stacked along the second direction, wherein the plurality of second insulating layers and the plurality of first insulating layers are disposed in a one-to-one correspondence, and the corresponding first insulating layers and second insulating layers are integrally formed.

19. The battery cell according to claim 18, characterized in that, The second insulating layer connected to the first insulating layer having the first opening has a second opening. The second opening penetrates the second insulating layer along the second direction. One end of the second opening is connected to the corresponding first opening, and the other end is spaced apart from the edge of the second insulating layer away from the first insulating portion.

20. The battery cell according to claim 19, characterized in that, The length of the second opening in its own extending direction is L, 0.5mm≤L≤10mm.

21. The battery cell according to claim 19 or 20, characterized in that, The second opening extends at an angle relative to the first direction.

22. The battery cell according to any one of claims 18-21, characterized in that, The insulating component includes a first adhesive layer, which includes a first adhesive portion and a second adhesive portion. The first adhesive portion adheres to two adjacent first insulating layers, and the second adhesive portion adheres to two adjacent second insulating layers. The first insulating portion includes the first adhesive portion, and the second insulating portion includes the second adhesive portion.

23. The battery cell according to any one of claims 18-22, characterized in that, The insulating component includes a second adhesive layer, the second adhesive layer includes a third adhesive portion and a fourth adhesive portion, the third adhesive portion is bonded to the first wall and the first insulating layer closest to the first wall, and the fourth adhesive portion is bonded to the second wall and the second insulating layer closest to the second wall; The first insulating portion includes the third adhesive portion, and the second insulating portion includes the fourth adhesive portion.

24. The battery cell according to any one of claims 1-4, characterized in that, The first insulating portion includes a first insulator portion and a second insulator portion, wherein the second insulator portion connects the first insulator portion and the second insulating portion; The thickness of the first insulator portion is less than the thickness of the second insulator portion and the thickness of the second insulating portion.

25. The battery cell according to claim 24, characterized in that, Along the second direction, the distance between the first insulator portion and the second wall is d2, 0.2mm≤d2≤3mm.

26. The battery cell according to any one of claims 24 or 25, characterized in that, The thickness of the first insulator part is h1, and the thickness of the second insulator part is h2, where 0.3 ≤ h1 / h2 ≤ 0.

6.

27. The battery cell according to any one of claims 1-4, characterized in that, The first insulating portion includes at least one first insulating layer, and the second insulating portion includes a plurality of second insulating layers stacked along the second direction. The number of first insulating layers is less than the number of second insulating layers, and each first insulating layer is connected to a corresponding second insulating layer.

28. The battery cell according to any one of claims 1-27, characterized in that, The housing includes a first wall and two second walls, the two second walls being located on both sides of the electrode assembly along the second direction; The insulating component includes two first insulating portions and two second insulating portions. The two second insulating portions are respectively disposed on the two second walls, and the two first insulating portions are each disposed on the first wall and respectively connected to the two second insulating portions.

29. The battery cell according to any one of claims 1-28, characterized in that, The housing includes a third wall located on one side of the electrode assembly along a third direction and connected to the first wall and the second wall, wherein the first direction, the second direction and the third direction are perpendicular to each other; The insulating member includes a third insulating portion and a fourth insulating portion. The third insulating portion is disposed on the third wall, and the fourth insulating portion is disposed on the first wall. The third insulating portion is connected to the second insulating portion and the fourth insulating portion. At least a portion of the thickness of the fourth insulating portion is less than the thickness of the third insulating portion.

30. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-29.

31. An electrical appliance, characterized in that, Includes the battery device according to claim 30, the battery device being used to provide electrical energy.

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