Battery cells, batteries, and electrical devices

Abstract

This application provides a battery cell, a battery, and an electric device, and relates to the technical field of batteries. The battery cell includes a housing, an electrode unit, and an insulating member. The housing includes a first wall, and the electrode unit is accommodated in the housing. The insulating member covers the outside of the housing and covers the outer surface of the first wall that is away from the electrode unit in the thickness direction. The insulating member has a first cutout area located on the side of the first wall that is away from the electrode unit in the thickness direction of the first wall. The first wall has a first exposed area for connecting to a pressing bar at a position corresponding to the first cutout area. When battery cells with this structure are assembled into a set to form a battery, the pressing bar can be directly connected to the housing, reducing the risk of the housing and pressing bar, which are indirectly connected via the insulating member, becoming detached, and improving connection strength. This contributes to improving the assembly quality and usability of batteries including such battery cells.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and specifically, to battery cells, batteries, and electrical devices.

Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries play an irreplaceable and important role as the power source of electric vehicles. With the popularization of new energy vehicles, the demand for power battery products is also increasing. A battery is composed of a plurality of battery cells stacked together. However, conventional batteries have the problem that after assembling a plurality of battery cells as a set, the assembly is not reliable. In addition, since the battery cells are likely to shake inside the battery during use, the assembly quality and use stability of the battery are poor.

Summary of the Invention

[0003] Embodiments of this application provide a battery cell, a battery, and an electrical device that can effectively improve the assembly quality and use stability of the battery.

[0004] In a first aspect, embodiments of this application provide a battery cell. The battery cell includes a housing including a first wall, an electrode unit accommodated in the housing, and an insulating member covering the outside of the housing and covering the outer surface of the first wall that is away from the electrode unit in the thickness direction of the first wall. The insulating member is provided with a first cutout region located on the side away from the electrode unit of the first wall in the thickness direction of the first wall, and the first wall forms a first exposed region for connecting to a pressing bar at a position corresponding to the first cutout region.

[0005] In the above proposed technology, by covering the outer surface of the housing with an insulating material to insulate the housing of the battery cell from the external environment, the risk of short-circuiting the battery cell during use can be reduced. Furthermore, by forming a first cutout area in the insulating material at a location corresponding to the first wall, such that a first exposed area is formed on the first wall of the housing, the battery cell can be connected to the pressure bar via the first exposed area, and when assembling the battery cells as a set to form a battery, the pressure bar can be directly connected to the housing. Therefore, the housing is not indirectly connected to the pressure bar via the insulating material, which reduces the influence of the insulating material on the connection between the battery cell and the pressure bar, effectively improves the connection strength, and reduces the risk of the housing and pressure bar becoming detached due to indirect connection via the insulating material. As a result, insulation of the battery cell from the external environment can be achieved, and the assembly quality when assembling the battery cells as a set can be improved, contributing to improved assembly quality and operational stability of batteries having such battery cells.

[0006] In some embodiments, the area of ​​the first exposed region is S, where S ≥ 50 mm 2 It satisfies the condition.

[0007] In the above proposed technology, the area of ​​the first exposed region for connecting to the pressing bar of the first wall is 50 mm². 2 By doing so, the first wall will have a sufficient surface area for connection with the pressure bar, which contributes to increasing the connection area between the first wall and the pressure bar and thereby improving the connection strength.

[0008] In some embodiments, the minimum distance between the first exposed area and the edge of the first wall is D1, satisfying 1 mm ≤ D1 ≤ 5 mm.

[0009] In the above proposed technology, by setting the minimum distance between the first exposed area and the edge of the first wall to 1 mm to 5 mm, the minimum distance between the first cutout area provided in the insulating member and the edge of the first wall becomes 1 mm to 5 mm. This improves the difficulty in manufacturing the first cutout area caused by the distance between the first cutout area and the edge of the first wall being too small, thereby reducing the difficulty in manufacturing the battery cell. Furthermore, it improves the problem where the insulating member covers the first wall too much, resulting in an area of ​​the first exposed area formed on the first wall being too small, caused by the distance between the first cutout area and the edge of the first wall being too large.

[0010] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, and side walls surrounding the first wall and the second wall, wherein the insulating member includes a separate first insulating member and a second insulating member, the first insulating member covering the outer surface of the first wall away from the electrode unit, and the second insulating member covering the outer surface of the second wall away from the electrode unit and the outer surface of the side wall away from the electrode unit.

[0011] In the above proposed technology, the insulating member is structured such that a first insulating member covering the first wall and a second insulating member covering the side wall and the second wall are provided separately. As a result, the first and second insulating members of the insulating member are provided corresponding to the first wall of the housing, and the second wall and side wall of the housing, respectively. This contributes to reducing the difficulty of assembling the insulating member and the housing.

[0012] In some embodiments, the first cutout region is provided in the first insulating member.

[0013] In the above proposed technology, a first cutout region is separately provided in the first insulating member, thereby forming a first exposed region on the first wall. Such an insulating member has a simple structure, is easy to process and manufacture, and the first cutout region and the second insulating member do not interfere with each other, contributing to a reduction in the difficulty of assembling the battery cell.

[0014] In some embodiments, the second insulating member is provided in the circumferential direction of the first wall and has a bent portion located on the side of the first wall away from the electrode unit, and the bent portion and the edge of the first insulating member together form the first cutout region.

[0015] In the above proposed technology, the second insulating member has a bent portion provided on the edge of the first wall along the circumferential direction of the first wall. The edge and bent portion of the first insulating member provided on the first wall together form a first cutout region. This forms a first exposed region on the first wall. The battery cell with this structure does not require the first insulating member to have a through hole, improving the overall structural strength of the first insulating member and suppressing the size and dimensions of the first cutout region.

[0016] In some embodiments, a portion of the bent portion is located between the first wall and the first insulating member in the thickness direction of the first wall.

[0017] In the above proposed technology, by providing a portion of the bent portion of the second insulating member between the first wall and the first insulating member in the thickness direction of the first wall, the first insulating member can press a portion of its bent portion against the first wall, thereby improving the connection stability of the bent portion of the second insulating member provided on the first wall and reducing the risk of the bent portion falling off.

[0018] In some embodiments, the first insulating member and the bent portion together form two first cutout regions, and in a first direction perpendicular to the thickness direction of the first wall, the two first cutout regions are located at both ends of the first insulating member, respectively.

[0019] In the above proposed technology, both ends and the bent portion of the first insulating member in the first direction form two cut-out regions, thereby forming two first exposed regions aligned along the first direction on the first wall, and each of the two first exposed regions is located at both ends of the first insulating member. This allows the first wall to be connected to the pressure bar via the two first exposed regions, contributing to a further improvement in the connection strength between the housing and the pressure bar. Furthermore, it reduces the impact of interference with the first insulating member when the first exposed regions and the pressure bar are connected, contributing to a reduction in the difficulty of assembling the battery cell and the pressure bar.

[0020] In some embodiments, the bent portion includes a first segment, a second segment, a third segment, and a fourth segment connected in order in the circumferential direction of the first wall, wherein the first segment and the third segment face each other in the first direction, the second segment and the fourth segment face each other in the second direction, the first direction, the second direction, and the thickness direction of the first wall are orthogonal to each other, the first insulating member is located between the first segment and the third segment in the first direction, one first cutout region is formed by the first segment, a part of the second segment, a part of the fourth segment, and one end of the first insulating member in the first direction, and another first cutout region is formed by the third segment, a part of the second segment, a part of the fourth segment, and the other end of the first insulating member in the first direction.

[0021] In the above proposed technology, the bent portion has a first segment, a second segment, a third segment, and a fourth segment that are sequentially connected in the circumferential direction of the first wall. By aligning the first segment and the third segment in the first direction and the second segment and the fourth segment in the second direction, a rectangular annular bent portion is formed. Furthermore, by providing the first insulating member between the first segment and the third segment in the first direction, the edges of both ends of the first insulating member in the first direction can form two first cutout regions with the bent portion, resulting in a simple structure that is easy to implement.

[0022] In some embodiments, the second wall and the side wall are of an integrally formed structure. In the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is formed as an opening. The first wall is an end cover that closes the opening.

[0023] In the above technical solution, when the second wall and the side wall of the housing are formed as an integrally formed structure, an opening is formed at the end of the side wall away from the second wall, and the first wall closes the opening, the housing can be assembled from two parts. For the housing with this structure, it is easy to cover the second insulating member of the insulating member on the outer surfaces of the integrally formed second wall and side wall, contributing to the reduction of the difficulty of assembling the battery cell.

[0024] In some embodiments, the battery cell is provided on the first wall and further includes an electrode terminal electrically connected to the electrode unit. The insulating member is provided with a mounting hole through which the electrode terminal is formed, and the mounting hole is provided at a distance from the first cutting area.

[0025] In the above technical solution, the electrode terminal is provided on the first wall, and a mounting hole for the electrode terminal to penetrate is provided at a position corresponding to the electrode terminal of the insulating member. By providing the mounting hole at a distance from the first cutting area, the first exposed area formed on the first wall corresponding to the first cutting area can be provided at a distance from the electrode terminal, and the influence caused by the interference between the first exposed area and the electrode terminal when the first exposed area is connected to an external component can be reduced. Also, by preventing the insulating member from communicating the first cutting area and the mounting hole, the insulating member can be inserted into the electrode terminal, improving the connection reliability of the insulating member.

[0026] In some embodiments, the minimum distance between the first cutting area and the mounting hole is D2, and D2 satisfies D2≥0.5 mm.

[0027] In the above technical solution, by making the minimum distance between the first cutting area and the mounting hole 0.5 mm or more, the minimum dimension of the portion of the insulating member between the first cutting area and the mounting hole becomes 0.5 mm or more, and the risk of breakage due to the dimension of the portion of the insulating member between the first cutting area and the mounting hole being too small can be reduced.

[0028] In some embodiments, on the first wall, two first exposed areas arranged along the first direction perpendicular to the thickness direction of the first wall are formed. Thus, on the insulating member, two first cutting areas arranged along the first direction are provided, and on the first wall, two electrode terminals arranged along the first direction and located between the two first cutting areas are provided. In the first direction, the minimum distance between each first cutting area and the adjacent mounting hole is D2.

[0029] In the above technical solution, two first cutting areas arranged along the first direction are provided, and on the first wall, two electrode terminals arranged along the first direction and located between the two first cutting areas are provided. The minimum distance between the first cutting area and the adjacent mounting hole is D2. By setting the minimum dimension of D2, the risk that the portion of the insulating member corresponding to the first exposed area and the electrode terminal breaks during use in the first direction can be reduced.

[0030] In some embodiments, on the first wall, two first exposed areas arranged along the first direction perpendicular to the thickness direction of the first wall are formed. Thus, on the insulating member, two first cutting areas arranged along the first direction are provided. In the first direction, the electrode terminals are located between the two first exposed areas.

[0031] In the above proposed technology, two first cutout regions are provided in the insulating member, arranged in the first direction, in order to form two first exposed regions arranged in the first direction on the first wall. Furthermore, electrode terminals are provided between the two first exposed regions. This allows for further improvement of the connection strength between the first wall and the pressure bar due to the two first exposed regions. Additionally, by providing the two first exposed regions on both sides of the electrode terminals, the difficulty of connecting to the pressure bar when assembling the battery cell set can be reduced.

[0032] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, and the battery cell further includes two electrode terminals provided on the first wall and the second wall, respectively, and electrically connected to the electrode unit.

[0033] In the above proposed technology, by providing the two electrode terminals of the battery cell on the opposing first wall and second wall of the housing, respectively, more space can be secured on the first wall to form the first exposed area, and the difficulty of providing the first cutout area in the insulating member can be reduced.

[0034] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, the insulating member further includes a second cutout region located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed region formed at a position corresponding to the second cutout region for connection to the housing.

[0035] In the above proposed technology, a first cutout region and a second cutout region are provided on both sides of the insulating member, corresponding to the first and second walls, respectively. That is, the insulating member has a first cutout region and a second cutout region on both opposing sides of the housing in the thickness direction of the first wall. This forms a first exposed region and a second exposed region on the first and second walls of the housing, respectively, and allows the first and second walls of the housing to be connected to the pressure bar and the housing, respectively, via the first and second exposed regions. This enhances the structural stability of the battery cells assembled within the housing. Furthermore, since the housing is directly connected to the housing, the risk of the housing and housing becoming detached, which are indirectly connected via the insulating member, is reduced.

[0036] In the second aspect, embodiments of the present application further provide a battery, which includes the battery cells described above.

[0037] In some embodiments, the battery further includes a housing and a pressing bar, the pressing bar being housed in the housing together with the battery cell and bonded to the first exposed area.

[0038] In the above proposed technology, the battery is provided with a housing and a pressure bar, and the battery cell is fixed inside the battery housing by bonding the pressure bar to the first exposed area of ​​the battery cell housing. In this structure, since the housing of the battery cell can be directly bonded to the pressure bar without an insulating material, it contributes to reducing the influence of insulating materials on the bonding between the battery cell and the pressure bar, reduces the risk of the housing and pressure bar, which are indirectly bonded via insulating materials, easily coming loose, and effectively increases the bonding strength. As a result, the structural stability of the battery cell assembled inside the housing is improved, the risk of the battery cell shaking or coming loose during use is reduced, and the assembly quality and usage stability of the battery can be improved.

[0039] In some embodiments, the battery comprises a plurality of the battery cells, and the pressing bar is bonded to the first exposed area of ​​the plurality of the battery cells.

[0040] In the above proposed technology, multiple battery cells are provided in the housing, and the pressing bar and the first exposed areas of the multiple battery cells are bonded to each other. As a result, the multiple battery cells can be connected integrally by the pressing bar, which contributes to improving the structural strength and structural stability of the multiple battery cells in the housing, and effectively enhances the battery's operational stability.

[0041] In some embodiments, the housing further includes a second wall facing the first wall in the thickness direction of the first wall, the insulating member further includes a second cutout region located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed region formed at a position corresponding to the second cutout region, which is bonded to the housing.

[0042] In the above proposed technology, the second exposed area of ​​the battery cell housing is bonded to the housing, thereby more securely fixing the battery cell within the housing. In this battery structure, the battery cell housing is directly bonded to the housing without the need for insulating material, which helps reduce the influence of insulating material on the bonding between the battery cell and the housing, and effectively increases the bonding strength. Therefore, the structural stability of the battery cell assembled within the housing is improved, the risk of the battery cell shaking or becoming detached during use is reduced, and the assembly quality and operational stability of the battery can be enhanced.

[0043] In the third aspect, embodiments of the present application further provide an electrical device, which includes the battery described above. [Brief explanation of the drawing]

[0044] To more clearly explain the technical concepts of the embodiments in this application, the drawings necessary for describing the embodiments are briefly described below. The drawings described are only a selection of embodiments of this application and do not limit the scope. A person skilled in the art can obtain other relevant drawings based on these drawings without employing inventive ability.

[0045] [Figure 1] This is a schematic diagram of the vehicle configuration according to several embodiments of this application. [Figure 2] This is a cross-sectional view of a battery according to several embodiments of this application. [Figure 3] This is a schematic diagram of the configuration of a battery cell according to several embodiments of this application. [Figure 4] This is a plan view of a battery cell according to some embodiments of this application. [Figure 5] This is a schematic diagram of the configuration of a battery cell (after the insulating material has been removed) according to some embodiments of this application. [Figure 6] This is a schematic diagram illustrating the configuration of the first insulating member of a battery cell according to several embodiments of this application. [Figure 7] Schematic diagrams of the configuration of a battery cell according to some other embodiments of this application. [Figure 8] This is a plan view of a battery cell according to some other embodiments of this application. [Figure 9] This is a schematic diagram of the configuration of a battery cell (after the first insulating member has been removed) according to some other embodiments of this application. [Figure 10] This is a schematic diagram of the configuration of the first insulating member of a battery cell according to some other embodiments of this application. [Figure 11] This is a bottom view of a battery cell according to some embodiments of this application. [Modes for carrying out the invention]

[0046] To clarify the purpose, technical concept, and advantages of the embodiments of this application, the technical concept in the embodiments of this application will be clearly explained below with reference to the drawings used in the embodiments of this application, and it should be noted that the embodiments described are only a selection of embodiments of this application, and not all embodiments. All other embodiments obtained by a person skilled in the art without using their inventive ability based on the embodiments of this application are all within the scope of protection of this application.

[0047] Unless otherwise specified, all technical and scientific terms used in this application have the same meaning as those commonly understood by a general expert in the field to which this application pertains. In this application, the terms used in the specification are for illustrative purposes only and do not limit the application. Furthermore, the terms “includes,” “has,” and their synonyms in the description of the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. Terms such as “first,” “second,” etc., in the description, claims, and drawings of this application are for distinguishing similar subjects only and do not limit any particular order or priority.

[0048] Any reference in this application to “Embodiments” means that certain features, structures, or characteristics described in relation to an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various parts of the specification does not mean that all of them refer to the same embodiment, nor do they represent separate or alternative embodiments that exclude each other.

[0049] In the description of this application, unless otherwise clearly defined or limited, terms such as "attachment," "coordination," "connection," and "fixing" should be understood in a broad sense. For example, it could be a fixed connection, a removable connection, or an integral connection. It could also be a direct connection, an indirect connection via an intermediate, or two elements communicating internally or interacting with each other. A person skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific situation.

[0050] The terms "and / or" as used in this application are merely for the purpose of describing the relationship between related objects, indicating that three relationships are possible. For example, A and / or B can indicate three situations: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the letter " / " in this specification generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0051] In the embodiments of this application, similar reference numerals indicate similar parts, and for the sake of brevity, detailed descriptions of the same parts are omitted between different embodiments. Furthermore, the dimensions such as thickness, length, and width of each part of the embodiments of this application shown in the drawings, as well as the overall dimensions such as thickness, length, and width of the integrating device, are illustrative only and should not be understood as limiting to this application.

[0052] In this application, "multiple" means two or more (including two).

[0053] In the embodiments of this application, the battery cell may be a secondary battery. A secondary battery is a battery cell that can be used continuously by recharging after the battery cell has been discharged, thereby activating the active material.

[0054] In the embodiments of this application, the battery cell may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, or a lead-acid battery.

[0055] A battery cell generally includes an electrode unit. The electrode unit includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a battery cell, active ions (e.g., lithium ions) reciprocate between the positive and negative electrodes, being inserted into and removed. The separator is placed between the positive and negative electrodes and serves to prevent short circuits between them while allowing active ions to pass through.

[0056] In some embodiments, the positive electrode is a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0057] For example, the positive electrode current collector has two opposing surfaces in the thickness direction, and the positive electrode active material is provided on one or both of the two opposing surfaces of the positive electrode current collector.

[0058] For example, a positive electrode current collector can be a metal foil sheet or a composite current collector. For instance, as a metal foil sheet, silver-surface-treated aluminum, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, or titanium can be used. A composite current collector may include a polymer material substrate layer and a metal layer. A composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0059] For example, the positive electrode active material may include, but is not limited to, at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof, and other conventional materials usable as battery positive electrode active materials can be used. These positive electrode active materials may be used individually or in combination of two or more. Here, examples of lithium-containing phosphates include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (which can be abbreviated as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (e.g., LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites.

[0060] In some embodiments, the negative electrode is a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0061] For example, negative electrode current collectors can be metal foil sheets, foamed metals, or composite current collectors. For instance, as metal foil sheets, silver-surface-treated aluminum, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, and titanium can be used. Foamed metals may include foamed nickel, foamed copper, foamed aluminum, foamed alloys, and foamed carbon. Composite current collectors may include a polymer material substrate layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, silver alloys, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] For example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0063] For example, the negative electrode current collector has two opposing surfaces in the thickness direction, and the negative electrode active material is provided on one or both of the two opposing surfaces of the negative electrode current collector.

[0064] For example, the negative electrode active material can be any negative electrode active material for battery cells known in the art. For example, the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0065] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0066] In some embodiments, the electrode unit further includes a separator, which is placed between the positive electrode and the negative electrode.

[0067] In some embodiments, the separator is a separator membrane. In this application, there are no particular limitations on the type of separator membrane, and a known porous separator membrane with excellent chemical and mechanical stability can be used.

[0068] For example, the main material of the separator membrane is at least one selected from glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0069] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes and serves both to conduct ions and to isolate the positive and negative electrodes.

[0070] In some embodiments, the battery cell further includes an electrolyte that facilitates the conduction of ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in this application and can be selected as needed. The electrolyte may be liquid, gel-like, or solid.

[0071] In some embodiments, the electrode unit has a wound structure. The positive electrode sheet and the negative electrode sheet are wound together to form the wound structure.

[0072] In some embodiments, the electrode unit has a stacked structure.

[0073] In some embodiments, the shape of the electrode unit may be cylindrical, flattened, polygonal prism-shaped, or the like.

[0074] In some embodiments, the electrode unit includes tabs through which current flows out of the electrode unit. The tabs include a positive electrode tab and a negative electrode tab.

[0075] In some embodiments, the battery cell may include a housing. The housing is used to enclose components such as electrode units and electrolytes. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum film.

[0076] For example, battery cells may be cylindrical, prismatic, pack, or other shapes. Prismatic battery cells include prismatic case battery cells, blade-shaped battery cells, and polygonal prism batteries. Polygonal prism batteries are, for example, hexagonal prism batteries and are not particularly limited in this application.

[0077] The battery according to the embodiment of this application is a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0078] In some embodiments, the battery may be a battery module. If there are multiple battery cells, the multiple battery cells are arranged to form a single battery module.

[0079] In some embodiments, the battery may be a battery pack. The battery pack includes a housing and battery cells, the battery cells or battery modules being housed in the housing.

[0080] In some embodiments, the housing can be part of the vehicle's chassis structure. For example, part of the housing can be at least part of the vehicle's floor, or at least part of the vehicle's cross members and side rails.

[0081] In some embodiments, the battery may be an energy storage device. The energy storage device may include an energy storage container, an energy storage cabinet, and the like.

[0082] Batteries possess excellent advantages such as high energy density, low environmental pollution, high power density, long service life, wide range of applications, and low self-discharge coefficient, making them an important component of current new energy development.

[0083] In a typical battery cell, the housing usually includes a housing body and an end cover, with the end cover closing the opening in the housing body. To facilitate assembly of the battery cell, the electrode terminals are usually attached to the end cover of the battery cell. Therefore, when the end cover closes the housing body, the electrode terminals, current collector, and tabs are first laminated and welded together. This establishes the electrical connection between the electrode terminals and the electrode unit. In this case, the electrode terminals are used as the output electrodes of the battery cell, enabling the input and output of electrical energy from the battery cell. Finally, the end cover is connected to the housing body.

[0084] Through the inventors' research, it was found that a battery typically contains multiple battery cells, which are arranged in a set and housed in the battery casing. To reduce the risk of short circuits between the battery cells, a blue film is usually placed over the outside of the housing body, and a top cover attachment piece is provided on the end cover of the housing to achieve insulating isolation between battery cells. To reduce the risk of multiple battery cells shaking within the casing when assembling a set of multiple battery cells, it is usually necessary to bond the battery cell housing body to the casing, provide a pressure bar on the battery casing, and apply structural adhesive to the end cover of each battery cell housing. By bonding the pressure bar to the end covers of multiple battery cells, the multiple battery cells can be assembled as a single unit, thereby improving the overall structural strength after assembling the set of multiple battery cells and increasing the battery's operational stability and reliability. However, when stacking battery cells of this structure as a set, the structural adhesive is secured to the top cover attachment piece, preventing direct bonding between the pressure bar and the end cover. Therefore, a top cover attachment piece is provided between the pressure bar and the end cover, creating a structure that indirectly adheres the pressure bar and the end cover via the top cover attachment piece. However, the connection strength between the top cover attachment piece and the end cover is insufficient to satisfy the connection strength required to adhere the pressure bar to the battery cell, which can result in the battery cell and pressure bar not being securely bonded when assembling multiple battery cells into a set. Furthermore, during use, the tensile action of the pressure bar can cause the top cover attachment piece to detach from the end cover, resulting in the pressure bar and battery cell becoming separated, which degrades the assembly quality and stability of the battery during use.

[0085] Based on the above research, the inventors diligently considered and designed a battery cell to solve the problems of poor battery assembly quality and operational stability. The battery cell includes a housing, an electrode unit, and an insulating member. The housing includes a first wall. The electrode unit is housed in the housing. The insulating member covers the outside of the housing and covers the outer surface of the first wall away from the electrode unit in the thickness direction of the first wall. A first cutout region is provided in the insulating member, and in the thickness direction of the first wall, the first cutout region is located on the side of the first wall away from the electrode unit. The first wall forms a first exposed region for connection to a pressing bar at a position corresponding to the first cutout region.

[0086] In this battery cell structure, the risk of short circuits in the battery cell during use can be reduced by covering the outer surface of the housing with an insulating material to isolate the housing from the external environment. Furthermore, by forming a first cutout area in the insulating material at a location corresponding to the first wall, such that a first exposed area is formed on the first wall of the housing, the battery cell can be connected to the pressure bar via the first exposed area, and when the battery cells are assembled as a set to form a battery, the pressure bar can be directly connected to the housing. Therefore, the housing is not indirectly connected to the pressure bar via the insulating material, which reduces the influence of the insulating material on the connection between the battery cell and the pressure bar, effectively improving the connection strength and reducing the risk of the housing and pressure bar becoming detached due to indirect connection via the insulating material. As a result, insulation of the battery cell from the external environment can be achieved, and the assembly quality when assembling the battery cells as a set can be improved, contributing to improved assembly quality and operational stability of batteries having such battery cells.

[0087] The battery cells disclosed in the embodiments of this application can be used in electrical devices such as vehicles, ships, or aircraft, but are not limited to these applications. By using the battery cells, batteries, etc., disclosed in this application to configure a power supply system for an electrical device, it is possible to solve the problem of unreliable assembly of battery cells that occurs when assembling multiple battery cells as a set, thereby improving the assembly quality and operational stability of the battery.

[0088] Embodiments of this application provide an electrical device powered by a battery. The electrical device may be, but is not limited to, a mobile phone, tablet, laptop computer, electric toy, power tool, electric scooter, electric car, boat, or aircraft. Here, electric toys include stationary or mobile toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys. Aircraft include airplanes, rockets, space shuttles, and spacecraft.

[0089] In the following embodiments, for the sake of explanation, the case in which the electrical device according to one embodiment of this application is a vehicle 1000 will be described as an example.

[0090] Figure 1 is a schematic diagram of the configuration of a vehicle 1000 according to several embodiments of the present application. The vehicle 1000 includes gasoline vehicles, natural gas vehicles, or new energy vehicles, and new energy vehicles include electric vehicles, hybrid vehicles, or range-extender electric vehicles. A battery 100 is located inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 is for supplying power to the vehicle 1000 and can be, for example, the operating power source or the power source for use of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is for controlling the battery 100 to supply power to the motor 300 and, for example, controls the battery 100 to supply the power necessary for starting, navigating, and driving the vehicle 1000.

[0091] In some embodiments of this application, the battery 100 can be used not only as an operating power source or power source for the vehicle 1000, but also as a power source for the vehicle 1000 to provide driving power to the vehicle 1000 in place of gasoline, natural gas or a portion thereof.

[0092] Figure 2 is a cross-sectional view of a battery 100 according to some embodiments of this application. Figure 3 is a schematic diagram of the configuration of a battery cell 20 according to some embodiments of this application. The battery 100 includes a housing 10 and a battery cell 20 housed in the housing 10.

[0093] The housing 10 is for providing an assembly space for the battery cells 20 and may be composed of multiple structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 together define an assembly space for housing the battery cells 20. The second housing body 12 is a hollow structure with one end open, and the first housing body 11 may be a plate-like structure. The first housing body 11 closes the open side of the second housing body 12, thereby defining the assembly space together with the second housing body 12. Both the first housing body 11 and the second housing body 12 may be hollow structures with one end open. The open side of the first housing body 11 can close the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can be various shapes, such as a cylinder or a rectangular parallelepiped. For example, in Figure 2, the shape of the housing 10 is a rectangular parallelepiped.

[0094] Regarding the battery 100, there may be one or more battery cells 20 provided in the housing 10. If there are multiple battery cells 20 provided in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in series-parallel. Series-parallel refers to connecting multiple battery cells 20 in series and in parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and the entire assembly composed of multiple battery cells 20 may be housed in the housing 10. Of course, the battery 100 may first form a battery module by connecting multiple battery cells 20 in series, in parallel, or in series-parallel, and then connect the multiple battery modules in series, in parallel, or in series-parallel to form a single unit which may be housed in the housing 10. The battery 100 may further include other structures, such as a busbar. The busbar enables the electrical connection of multiple battery cells 20 by connecting the multiple battery cells 20 together.

[0095] Each battery cell 20 may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 may have a cylindrical, flattened, rectangular parallelepiped, or other shape. Exemplarily, in Figure 3, the battery cell 20 has a rectangular parallelepiped structure.

[0096] In some embodiments, as shown in Figure 2, the battery 100 may further include a pressure bar 30. The battery 100 includes a plurality of battery cells 20, and the pressure bar 30 is provided inside the housing 10. The pressure bar 30 is connected to the plurality of battery cells 20 and fixes the plurality of battery cells 20 as a single unit. This helps to reduce the risk of the plurality of battery cells 20 shaking or bumping into each other inside the housing 10.

[0097] Exemplary, in Figure 2, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom of the housing 10. That is, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom surface of the second housing body 12 facing the first housing body 11, and the other end is bonded to the pressure bar 30. The pressure bar 30 is bonded to multiple battery cells 20, forming the multiple battery cells 20 housed in the housing 10 as a single unit. This improves the overall structural strength of the battery 100 and reduces the risk of the battery cells 20 shaking or bumping into each other during use.

[0098] Furthermore, the battery cell 20 may be placed upright within the housing 10, or upside down within the housing 10. When the battery cell 20 is placed upright within the housing 10, the bottom of the battery cell 20 is usually bonded to the bottom of the housing 10, and the pressure bar 30 is bonded to the top of the battery cell 20. When the battery cell 20 is placed upside down within the housing 10, the top of the battery cell 20 is usually bonded to the top of the housing 10, and the pressure bar 30 is bonded to the bottom of the battery cell 20. Exemplarily, in Figure 2, the battery cell 20 is placed upright within the housing 10.

[0099] According to some embodiments of this application, as shown in Figures 2, 3, 4, and 5, Figure 4 is a plan view of a battery cell 20 according to some embodiments of this application, and Figure 5 is a schematic diagram of the configuration of a battery cell 20 (after the insulating member 23 has been removed) according to some embodiments of this application. This application provides a battery cell 20 comprising a housing 21, an electrode unit 22, and an insulating member 23. The housing 21 includes a first wall 211. The electrode unit 22 is housed in the housing 21. The insulating member 23 covers the outside of the housing 21 and covers the outer surface of the first wall 211 away from the electrode unit 22 in the thickness direction X of the first wall. The insulating member 23 is provided with a first cutout region 231, the first cutout region 231 is located on the side of the first wall 211 away from the electrode unit 22 in the thickness direction X of the first wall. The first wall 211 forms a first exposed area 2111 for connection to the pressing bar 30 at a position corresponding to the first cutout area 231.

[0100] Furthermore, the housing 21 can accommodate an electrolyte, such as an electrolyte solution. The housing 21 can take on various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the material of the housing 21 can be of various types, such as copper, iron, aluminum, steel, or aluminum alloy.

[0101] In some embodiments, the housing 21 may further include a second wall 212 and a side wall 213. The second wall 212 faces the first wall 211 in the thickness direction X of the first wall, and the side wall 213 surrounds the second wall 212 and is integrally molded with the second wall 212. As a result, the side wall 213 is formed as an opening 2131, with one end connected to the second wall 212 and the other end facing the second wall 212. That is, the side wall 213 together with the second wall 212 forms a housing body having a housing chamber. The housing chamber accommodates the electrode unit 22 and has an opening 2131. In other words, the side wall 213 and the second wall 212 form a hollow structure with an opening 2131 at one end, and the first wall 211 closes the opening 2131 formed by the side wall 213. In other words, the first wall 211 is an end cover for closing the opening 2131 of the housing 21. The first wall 211 closes and seals the opening 2131 of the side wall 213 so as to form a sealed space for housing the electrode unit 22 and the electrolyte. That is, the first exposed area 2111 is formed in the end cover of the housing 21.

[0102] In other embodiments, the side wall 213 is integrally molded with the first wall 211, and correspondingly, the second wall 212 becomes an end cover that closes the opening 2131. That is, the first exposed area 2111 is formed in the bottom wall of the housing body of the housing 21 that faces the end cover. Of course, the housing 21 is not limited to the above structure and may have other structures. For example, the housing 21 may include a first wall 211, a second wall 212, and a side wall 213, which are provided separately. The side wall 213 forms a hollow structure with openings 2131 at both opposing ends, and the first wall 211 and the second wall 212 close and seal the two openings 2131 of the side wall 213, respectively. This forms a sealed space for housing the electrode unit 22 and the electrolyte.

[0103] The battery cell 20 can be assembled by first placing the electrode unit 22 into the housing body formed by the side wall 213 and the second wall 212, then filling the housing body with electrolyte, and then closing the opening 2131 of the housing body with the first wall 211.

[0104] The housing 21 can take on various shapes, such as a cylindrical, rectangular parallelepiped, or prismatic structure. The shape of the housing 21 can be determined according to the specific shape of the electrode unit 22. For example, if the electrode unit 22 has a cylindrical structure, a cylindrical housing 21 can be used, and if the electrode unit 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 21 can be used. Exemplarily, in Figure 3, the housing 21 has a rectangular parallelepiped structure.

[0105] Furthermore, the electrode unit 22 is a component that causes an electrochemical reaction within the battery cell 20. The electrode unit 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. There are various structures for the electrode unit 22. For example, the electrode unit 22 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or it may be a laminated structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet. Similarly, there may be one or more electrode units 22 housed in the housing 21. Exemplarily, in Figure 2, there are two electrode units 22, and the two electrode units 22 are stacked in the thickness direction.

[0106] The insulating member 23 covers the outside of the housing 21 and also covers the outer surface of the first wall 211 that is separated from the electrode unit 22 in the thickness direction X of the first wall. In other words, the insulating member 23 covers the entire outer surface of the housing 21 such that the first wall 211 of the housing 21 is covered by the insulating member 23.

[0107] For example, the insulating member 23 can be made of various materials, such as rubber or silicone. For example, the insulating member 23 is bonded to the outer surface of the housing 21.

[0108] The first wall 211 forms a first exposed area 2111 at a location corresponding to the first cutout area 231. That is, the insulating member 23 is provided with a first cutout area 231, and the first cutout area 231 causes the first wall 211 of the housing 21 to have an area exposed from the first cutout area 231, thus forming a first exposed area 2111 where the first wall 211 is not covered by the insulating member 23.

[0109] Optionally, there may be one or more first cutout regions 231 provided in the insulating member 23. Exemplarily, in Figure 4, the insulating member 23 is provided with two first cutout regions 231 spaced apart in a first direction Y perpendicular to the thickness direction X of the first wall, that is, two first exposed regions 2111 are formed in the first wall 211, spaced apart along the first direction Y. This improves the connection strength between the first wall 211 and the pressing bar 30. Of course, in other embodiments, the number of first cutout regions 231 may be one, three, four, five, etc.

[0110] Exemplary, the first cutout region 231 is rectangular, and correspondingly, the first exposed region 2111 formed on the first wall 211 is also rectangular. In other embodiments, the first cutout region 231 may be triangular, pentagonal, circular, elliptical, or the like.

[0111] Furthermore, the first exposed region 2111 is intended to be connected to the pressure bar 30, and there are various methods of connection, such as adhesive bonding or welding. Exemplaryly, in the embodiment of this application, the first exposed region 2111 is bonded to the pressure bar 30.

[0112] In some embodiments, as shown in Figure 5, the battery cell 20 further includes a pressure relief mechanism 24. The pressure relief mechanism 24 is attached to the housing 21 and releases the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a preset value.

[0113] Optionally, the pressure relief mechanism 24 may be provided on the first wall 211 of the housing 21, on the second wall 212 of the housing 21, or on the side wall 213 of the housing 21. Exemplarily, in Figures 3 and 5, the pressure relief mechanism 24 is provided on the first wall 211, and correspondingly, an escape port 232 is provided in the insulating member 23 to avoid the pressure relief mechanism 24 in order to facilitate the discharge of internal pressure from the battery cell 20 by the pressure relief mechanism 24.

[0114] For example, the pressure relief mechanism 24 may be a pressure relief component such as an explosion-proof valve, explosion-proof sheet, air valve, pressure relief valve, or safety valve.

[0115] By covering the outer surface of the housing 21 of the battery cell 20 with an insulating member 23 to insulate the housing 21 from the external environment, the risk of short-circuiting the battery cell 20 during use can be reduced. Furthermore, by providing a first cutout area 231 in the insulating member 23 at a location corresponding to the first wall 211, so as to form a first exposed area 2111 in the first wall 211 of the housing 21, the battery cell 20 can be connected to the pressure bar 30 via the first exposed area 2111. When assembling the battery cells 20 as a set to form the battery 100, the pressure bar 30 can be directly connected to the housing 21. Therefore, the housing 21 is not indirectly connected to the pressure bar 30 via the insulating member 23, which reduces the influence of the insulating member 23 on the connection between the battery cell 20 and the pressure bar 30, effectively improving the connection strength and reducing the risk of the housing 21 and pressure bar 30, which are indirectly connected via the insulating member 23, becoming detached. As a result, the battery cells 20 can be made insulated from the external environment, and the assembly quality when assembling the battery cells 20 as a set can be improved, contributing to improved assembly quality and operational stability of the battery 100 having such battery cells 20.

[0116] According to some embodiments of this application, as shown in Figure 4, the area of ​​the first exposed region 2111 is S, and S ≥ 50 mm 2The following conditions are met: That is, the area of ​​the region formed on the first wall 211 corresponding to the first cutout region 231 and not covered by the insulating member 23 is 50 mm². 2 That's all.

[0117] The area of ​​the first exposed region 2111 for connecting to the pressing bar 30 of the first wall 211 is 50 mm². 2 By doing so, the first wall 211 will have a sufficient area for connection with the pressure bar 30, which contributes to increasing the connection area between the first wall 211 and the pressure bar 30 and thereby increasing the connection strength.

[0118] According to some embodiments of this application, as shown in Figure 4, the minimum distance between the first exposed area 2111 and the edge of the first wall 211 is D1, satisfying 1 mm ≤ D1 ≤ 5 mm.

[0119] By setting the minimum distance between the first exposed area 2111 and the edge of the first wall 211 to 1 mm to 5 mm, the minimum distance between the first cutout area 231 provided in the insulating member 23 and the edge of the first wall 211 becomes 1 mm to 5 mm. This improves the difficulty in manufacturing the first cutout area 231 caused by the distance between the first cutout area 231 and the edge of the first wall 211 being too small, thereby reducing the difficulty in manufacturing the battery cell 20. Furthermore, it improves the problem where the insulating member 23 covers the first wall 211 too much, resulting in an area of ​​the first exposed area 2111 formed on the first wall 211 being too small, caused by the distance between the first cutout area 231 and the edge of the first wall 211 being too large.

[0120] According to some embodiments of this application, as shown in Figures 3 and 5, the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall, and a side wall 213 surrounding the first wall 211 and the second wall 212. The insulating member 23 includes a separately provided first insulating member 233 and a second insulating member 234, the first insulating member 233 covering the outer surface of the first wall 211 away from the electrode unit 22, and the second insulating member 234 covering the outer surface of the second wall 212 away from the electrode unit 22 and the outer surface of the side wall 213 away from the electrode unit 22.

[0121] In the thickness direction X of the first wall, the second wall 212 and the first wall 211 are arranged to face each other, and the side wall 213 surrounds the periphery of the first wall 211 and the second wall 212. That is, the first wall 211 and the second wall 212 are spaced apart in the thickness direction X of the first wall and are each provided at both ends of the side wall 213. The side wall 213 surrounds the periphery of the first wall 211 in the circumferential direction and surrounds the periphery of the second wall 212 in the circumferential direction. Furthermore, the structure of the housing 21 can vary. It may be a structure in which the first wall 211, the second wall 212, and the side wall 213 are separate components, or the second wall 212 and the side wall 213 may be integrally molded and the first wall 211 may be connected to the end of the side wall 213 that is separated from the second wall 212, or the first wall 211 and the side wall 213 may be integrally molded and the second wall 212 may be connected to the end of the side wall 213 that is separated from the first wall 211.

[0122] The first insulating member 233 covers the outer surface of the first wall 211 that is separated from the electrode unit 22. That is, the first insulating member 233 is provided on the first wall 211 and is located on the side of the first wall 211 that is separated from the inside of the battery cell 20.

[0123] The second insulating member 234 covers the outer surface of the second wall 212 that is away from the electrode unit 22 and the outer surface of the side wall 213 that is away from the electrode unit 22. That is, the second insulating member 234 is provided on the housing body formed by the second wall 212 and the side wall 213, and is located on the side of the housing body that is away from the inside of the battery cell 20.

[0124] By providing the insulating member as a separate unit consisting of a first insulating member 233 covering the first wall 211 and a second insulating member 234 covering the side wall 213 and the second wall 212, the first insulating member 233 and the second insulating member 234 of the insulating member 23 are provided corresponding to the first wall 211, the second wall 212, and the side wall 213 of the housing 21, respectively, thereby contributing to reducing the difficulty of assembling the insulating member 23 and the housing 21.

[0125] In some embodiments of this application, as shown in Figures 3, 4, 5, and 6, Figure 6 is a schematic diagram of the configuration of the first insulating member 233 of the battery cell 20 according to some embodiments of this application. The first cutout region 231 is provided in the first insulating member 233.

[0126] The first cutout region 231 is a through-hole structure provided in the first insulating member 233, and penetrates the first insulating member 233 along the thickness direction X of the first wall 211 so as to form a first exposed region 2111 in the first wall 211.

[0127] Furthermore, in an embodiment in which the minimum distance D1 between the first exposed region 2111 and the edge of the first wall 211 is 1 mm to 5 mm, the first insulating member 233 covers the surface of the first wall 211 that is separated from the electrode unit 22, and the first cutout region 231 is provided in the first insulating member 233. Therefore, the minimum distance D1 between the first exposed region 2111 and the edge of the first wall 211 becomes the minimum distance between the first cutout region 231 and the edge of the first insulating member 233. That is, the minimum distance between the first cutout region 231 and the edge of the first insulating member 233 is 1 mm to 5 mm.

[0128] By separately providing a first cutout region 231 in the first insulating member 233, a first exposed region 2111 is formed in the first wall 211. Such an insulating member 23 has a simple structure, is easy to process and manufacture, and the first cutout region 231 and the second insulating member 234 do not interfere with each other, contributing to a reduction in the difficulty of assembling the battery cell 20.

[0129] In some embodiments of this application, as shown in Figures 7, 8, and 9, Figure 7 is a schematic diagram of the configuration of a battery cell 20 according to some other embodiments of this application. Figure 8 is a plan view of a battery cell 20 according to some other embodiments of this application. Figure 9 is a schematic diagram of the configuration of a battery cell 20 (after the first insulating member 233 has been removed) according to some other embodiments of this application. The second insulating member 234 is provided in the circumferential direction of the first wall 211 and has a bent portion 2341 located on the side of the first wall 211 away from the electrode unit 22. The bent portion 2341 and the edge of the first insulating member 233 together form the first cutout region 231.

[0130] The second insulating member 234 is provided in the circumferential direction of the first wall 211 and has a bent portion 2341 located on the side of the first wall 211 away from the electrode unit 22. That is, a part of the second insulating member 234 provided on the outside of the housing body formed by the second wall 212 and the side wall 213 is bent toward the first wall 211 so as to form a bent portion 2341 that is located on the outer surface of the first wall 211 and has an annular structure extending in the circumferential direction of the first wall 211.

[0131] The bent portion 2341 and the edge of the first insulating member 233 together form the first cutout region 231. That is, the first cutout region 231 is formed by being surrounded by the annular bent portion 2341 and the edge of the first insulating member 233 provided on the outer surface of the first wall 211, in other words, the inner edge of the bent portion 2341 and the outer edge of the first insulating member 233 define the first cutout region 231.

[0132] Furthermore, in an embodiment where the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is 1 mm to 5 mm, as shown in Figure 8, since the first cutout area 231 is formed by the first insulating member 233 and the bent portion 2341, the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is the width of the bent portion 2341. That is, the width of the bent portion 2341 is 1 mm to 5 mm.

[0133] The second insulating member 234 is provided on the first wall 211 in the circumferential direction and has a bent portion 2341 provided on the edge of the first wall 211. As a result, the edge of the first insulating member 233 formed on the first wall 211 and a part of the bent portion 2341 together form the first cutout region 231. As a result, the first exposed region 2111 is formed on the first wall 211. The battery cell 20 with this structure does not require the first insulating member 233 to have a through hole, improving the overall structural strength of the first insulating member 233 and suppressing the size and dimensions of the first cutout region 231.

[0134] According to some embodiments of this application, as shown in Figures 7 and 9, a portion of the bent portion 2341 is located between the first wall 211 and the first insulating member 233 in the thickness direction X of the first wall.

[0135] A portion of the bent portion 2341 is located between the first wall 211 and the first insulating member 233. In other words, a portion of the first insulating member 233 is provided on the side of the bent portion 2341 that is away from the first wall 211 in the thickness direction X of the first wall, so that the first insulating member 233 and the first wall 211 tightly sandwich the bent portion 2341.

[0136] Exemplary, in Figures 7 and 9, the first insulating member 233 has a rectangular structure, and the bent portion 2341 has a rectangular annular structure. The bent portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d that are sequentially connected in the circumferential direction of the first wall 211. In the first direction Y, the first segment 2341a and the third segment 2341c face each other, and in the second direction Z, the second segment 2341b and the fourth segment 2341d face each other, and the first direction Y, the second direction Z, and the thickness direction X of the first wall are orthogonal to each other. The ends of the first insulating member 233 in the second direction Z are joined to the second segment 2341b and the fourth segment 2341d of the bent portion 2341, respectively, so that the bent portion 2341 is positioned between the first insulating member 233 and the first wall 211 in the thickness direction X of the first wall.

[0137] By providing a portion of the bent portion 2341 of the second insulating member 234 between the first wall 211 and the first insulating member 233 in the thickness direction X of the first wall, the first insulating member 233 can press a portion of the bent portion 2341 against the first wall 211, thereby improving the connection stability of the bent portion 2341 of the second insulating member 234 provided on the first wall 211 and reducing the risk of the bent portion 2341 falling off.

[0138] In some embodiments of this application, as shown in Figures 7, 8, and 9, the first insulating member 233 and the bent portion 2341 together form two first cutout regions 231. In a first direction Y perpendicular to the thickness direction X of the first wall, the two first cutout regions 231 are located at both ends of the first insulating member 233, respectively.

[0139] In the first direction Y, the two first cutout regions 231 are located at both ends of the first insulating member 233. That is, the dimensions of the first insulating member 233 in the first direction Y are smaller than the dimensions of the bent portion 2341 in the first direction Y, so that both ends of the first insulating member 233 in the first direction Y form the two first cutout regions 231 with the inner edges of the bent portion 2341. Thus, the two first cutout regions 231 are located at both ends of the first insulating member 233 in the first direction Y.

[0140] Both ends of the first insulating member 233 and the bent portion 2341 in the first direction Y together form two cut-out regions, thereby forming two first exposed regions 2111 arranged along the first direction Y on the first wall 211, and the two first exposed regions 2111 are located at both ends of the first insulating member 233. This allows the first wall 211 to be connected to the pressure bar 30 via the two first exposed regions 2111, contributing to a further improvement in the connection strength between the housing 21 and the pressure bar 30. In addition, the influence of interference with the first insulating member 233 when the first exposed regions 2111 and the pressure bar 30 are connected can be reduced, contributing to a reduction in the difficulty of assembling the battery cell 20 and the pressure bar 30.

[0141] In some embodiments, as shown in Figures 7, 8, and 9, the bent portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d that are sequentially connected in the circumferential direction of the first wall 211. In the first direction Y, the first segment 2341a and the third segment 2341c face each other, and in the second direction Z, the second segment 2341b and the fourth segment 2341d face each other, with the first direction Y, the second direction Z, and the thickness direction X of the first wall being orthogonal to each other. The first insulating member 233 is located between the first segment 2341a and the third segment 2341c in the first direction Y. A first cutout region 231 is formed by the first segment 2341a, a part of the second segment 2341b, a part of the fourth segment 2341d, and one end of the first insulating member 233 in the first direction Y. Another first cutout region 231 is formed by the third segment 2341c, a part of the second segment 2341b, a part of the fourth segment 2341d, and the other end of the first insulating member 233 in the first direction Y.

[0142] Here, in the first direction Y, the first segment 2341a and the third segment 2341c face each other, and in the second direction Z, the second segment 2341b and the fourth segment 2341d face each other. In other words, the bent portion 2341 of the second insulating member 234 has a rectangular annular structure.

[0143] The first insulating member 233 is located between the first segment 2341a and the third segment 2341c in the first direction Y. The first segment 2341a, a part of the second segment 2341b, a part of the fourth segment 2341d, and one end of the first insulating member 233 in the first direction Y form one first cutout region 231. The third segment 2341c, a part of the second segment 2341b, a part of the fourth segment 2341d, and the other end of the first insulating member 233 in the first direction Y form another first cutout region 231. In other words, in the first direction Y, the first insulating member 233 is located between the first segment 2341a and the third segment 2341c, and is provided with a gap between it and the first segment 2341a and the third segment 2341c. The first insulating member 233 has two ends in the second direction Z that join the second segment 2341b and the fourth segment 2341d, respectively, covering a portion of the second segment 2341b and a portion of the fourth segment 2341d. As a result, the first insulating member 233 has one first cutout region 231 formed between one end in the first direction Y and the first segment 2341a, and another first cutout region 231 formed between the other end and the third segment 2341c.

[0144] The folded portion 2341 has a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d that are sequentially connected in the circumferential direction of the first wall 211. By aligning the first segment 2341a and the third segment 2341c in the first direction Y, and the second segment 2341b and the fourth segment 2341d in the second direction Z, a rectangular annular folded portion 2341 is formed. Furthermore, by providing the first insulating member 233 between the first segment 2341a and the third segment 2341c in the first direction Y, the edges of both ends of the first insulating member 233 in the first direction Y can form two first cutout regions 231 with the folded portion 2341, resulting in a simple structure that is easy to implement.

[0145] In some embodiments of this application, as shown in Figures 3, 5, and 7, the second wall 212 and the side wall 213 are integrally molded structures, and in the thickness direction X of the first wall, one end of the side wall 213 is connected to the second wall 212 and the other end is formed as an opening 2131. The first wall 211 is an end cover that closes the opening 2131.

[0146] The second wall 212 and the side wall 213 form a hollow structure having an opening 2131 at one end of the first wall in the thickness direction X. The first wall 211 closes the opening 2131. This forms a housing 21 for accommodating the electrode unit 22. Of course, in other embodiments, the second wall 212 and the side wall 213 may be separate structures. That is, the side wall 213 may be a hollow structure having openings 2131 at both ends of the first wall in the thickness direction X, and the first wall 211 and the second wall 212 may each close the two openings 2131 of the side wall 213.

[0147] The second wall 212 and the side wall 213 are integrally molded. That is, the second wall 212 and the side wall 213 of the housing 21 are formed by an integral molding method such as pressing or casting.

[0148] The second wall 212 and side wall 213 of the housing 21 are formed as an integrally molded structure, and an opening 2131 is formed at the end of the side wall 213 away from the second wall 212, so that the first wall 211 closes the opening 2131. This allows the housing 21 to be assembled from two parts. With this structure, it is easy to cover the second insulating member 234 of the insulating member 23 with the outer surface of the integrally molded second wall 212 and side wall 213, which contributes to reducing the difficulty of assembling the battery cell 20.

[0149] In some embodiments of this application, as shown in Figures 3, 6, 7, and 10, Figure 10 is a schematic diagram of the configuration of a first insulating member 233 of a battery cell 20 according to some other embodiments of this application. The battery cell 20 further includes electrode terminals 25 provided on a first wall 211 and electrically connected to an electrode unit 22. The insulating member 23 is provided with mounting holes 235 through which the electrode terminals 25 are drilled, and the mounting holes 235 are spaced apart from the first cutout area 231.

[0150] The mounting holes 235 are provided at a distance from the first cutout area 231. That is, the electrode terminals 25 provided on the first wall 211 are provided at a distance from the first cutout area 231, and a portion of the insulating member 23 is located between the electrode terminals 25 and the first cutout area 231.

[0151] An electrode terminal 25 is provided in the first wall 211, and a mounting hole 235 is provided in the insulating member 23 at a location corresponding to the electrode terminal 25 for the electrode terminal 25 to pass through. By providing the mounting hole 235 at a distance from the first cutout region 231, the first exposed region 2111 formed in the first wall 211 corresponding to the first cutout region 231 can be provided at a distance from the electrode terminal 25, thereby reducing the impact of interference between the electrode terminal 25 and the first exposed region 2111 when it is connected to an external component. Furthermore, since the first cutout region 231 and the mounting hole 235 are not in communication due to the insulating member 23, the insulating member 23 is extrapolated onto the electrode terminal 25, thereby improving the connection reliability of the insulating member 23.

[0152] In some embodiments of this application, as shown in Figures 3, 6, 7, and 10, the minimum distance between the first cutout region 231 and the mounting hole 235 is D2, satisfying D2 ≥ 0.5 mm.

[0153] The minimum distance between the first cutout region 231 and the mounting hole 235 is D2. In other words, in the direction of alignment between the first cutout region 231 and the mounting hole 235, the minimum dimension of the portion of the first insulating member 233 of the insulating member 23 that lies between the first cutout region 231 and the mounting hole 235 is D2.

[0154] By making the minimum distance between the first cutout area 231 and the mounting hole 235 0.5 mm or more, the minimum dimension of the insulating member 23 portion between the first cutout area 231 and the mounting hole 235 becomes 0.5 mm or more, thereby reducing the risk of breakage due to the insulating member 23 portion between the first cutout area 231 and the mounting hole 235 being too small.

[0155] In some embodiments, as shown in Figures 3, 6, 7, and 10, the insulating member 23 is provided with two first cutout regions 231 arranged along the first direction Y to form two first exposed regions 2111 on the first wall 211, which are arranged along the first direction Y perpendicular to the thickness direction X of the first wall. The first wall 211 is provided with two electrode terminals 25 arranged along the first direction Y and located between the two first cutout regions 231. In the first direction Y, the minimum distance between each first cutout region 231 and the adjacent mounting hole 235 is D2.

[0156] Furthermore, in embodiments where a first cutout region 231 is provided in the first insulating member 233, as shown in Figure 6, D2 is the distance between the first cutout region 231 and the adjacent mounting hole 235 in the first direction Y. In embodiments where the first insulating member 233 and the bent portion 2341 of the second insulating member 234 surround each other, as shown in Figure 10, D2 is the distance between the first cutout region 231 and the adjacent end of the first insulating member 233 in the first direction Y.

[0157] The insulating member 23 is provided with two first cutout regions 231 arranged along a first direction Y, and the first wall 211 is provided with two electrode terminals 25 arranged along the first direction Y and located between the two first cutout regions 231, with the minimum distance between the first cutout region 231 and the adjacent mounting hole 235 being D2. By setting the minimum dimension of D2, the risk of the portion of the insulating member 23 corresponding to the first exposed region 2111 and the electrode terminals 25 in the first direction Y breaking during use can be reduced.

[0158] In some embodiments of this application, as shown in Figures 3 and 7, the insulating member 23 is provided with two first cutout regions 231 arranged along the first direction Y in order to form two first exposed regions 2111 in the first wall 211, which are arranged along the first direction Y perpendicular to the thickness direction X of the first wall. In the first direction Y, the electrode terminals 25 are located between the two first exposed regions 2111. That is, the two first cutout regions 231 are located on either side of the two electrode terminals 25 in the first direction Y, such that one first cutout region 231, one electrode terminal 25, the other electrode terminal 25, and the other first cutout region 231 are arranged in order along the first direction Y.

[0159] To form two first exposed regions 2111 arranged along the first direction Y on the first wall 211, two first cutout regions 231 arranged along the first direction Y are provided on the insulating member 23. Furthermore, the electrode terminals 25 are provided between the two first exposed regions 2111. This allows the connection strength between the first wall 211 and the pressure bar 30 to be further improved by the two first exposed regions 2111. Additionally, by providing the two first exposed regions 2111 on both sides of the electrode terminals 25, the difficulty of connecting to the pressure bar 30 when assembling the battery cell 20 as a set can be reduced.

[0160] Furthermore, in some embodiments, the battery cell 20 may have other structures. For example, the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The battery cell 20 further includes two electrode terminals 25 provided on the first wall 211 and the second wall 212, respectively, and electrically connected to an electrode unit 22. That is, the two electrode units 22 for the positive and negative electrodes for input and output of the battery cell 20 are provided on both sides of the housing 21 in the thickness direction X of the first wall, respectively. Of course, in other embodiments, the electrode terminals 25 may be provided on a side wall 213.

[0161] By providing the two electrode terminals 25 of the battery cell 20 on the opposing first wall 211 and second wall 212 of the housing 21, it is possible to secure more space for forming the first exposed area 2111 on the first wall 211 and reduce the difficulty of providing the first cutout area 231 on the insulating member 23.

[0162] In some embodiments of this application, as shown in Figures 3, 5, and 11, Figure 11 is a bottom view of a battery cell 20 according to some embodiments of this application. The housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The insulating member 23 is further provided with a second cutout region 236 located on the side of the second wall 212 away from the electrode unit 22 in the thickness direction X of the first wall, and the second wall 212 has a second exposed region 2121 formed at a position corresponding to the second cutout region 236 for connection to the housing 10.

[0163] The second wall 212 has a second exposed area 2121 formed at a position corresponding to the second cutout area 236. That is, the insulating member 23 is provided with a second cutout area 236, and the second wall 212 of the housing 21 has an area that is exposed from the second cutout area 236. As a result, the second exposed area 2121 is formed on the second wall 212 that is not covered by the insulating member 23.

[0164] Optionally, the second cutout region 236 provided in the insulating member 23 may be one or more. Exemplarily, in Figure 11, one second cutout region 236 is provided in the insulating member 23, thereby forming one second exposed region 2121 in the second wall 212. Of course, in other embodiments, two, three, four, five, or more second cutout regions 236 may be formed.

[0165] Exemplary, the second cutout region 236 is rectangular, and correspondingly, the second exposed region 2121 formed on the second wall 212 is also rectangular. In other embodiments, the second cutout region 236 may be formed in the shape of a triangle, pentagon, circle, ellipse, or the like.

[0166] The second exposed region 2121 is for connection to the housing 10, and there are various methods of connection, such as adhesive bonding or welding. Exemplaryly, in the embodiment of this application, the second exposed region 2121 is bonded to the housing 10.

[0167] Furthermore, in an embodiment that includes a first insulating member 233 and a second insulating member 234, which are provided separately from the insulating member 23, the second cutout region 236 is provided in the second insulating member 234. The second cutout region 236 is a through hole provided in the second insulating member 234 and is located on the side of the second wall 212 away from the electrode unit 22.

[0168] First cutout regions 231 and second cutout regions 236 are provided on both sides of the insulating member 23, corresponding to the first wall 211 and the second wall 212, respectively. That is, the insulating member 23 has first cutout regions 231 and second cutout regions 236 on both opposing sides of the housing 21 in the thickness direction X of the first wall. This forms first exposed regions 2111 and second exposed regions 2121 on the first wall 211 and second wall 212 of the housing 21, respectively, and allows the first wall 211 and second wall 212 of the housing 21 to be connected to the pressure bar 30 and the housing 10, respectively, via the first exposed regions 2111 and second exposed regions 2121. This increases the structural stability of the battery cell 20 assembled inside the housing 10. Furthermore, since the housing 21 is directly connected to the housing 10, the risk of the housing 21 and housing 10, which are indirectly connected via the insulating member 23, easily becoming detached is reduced.

[0169] In some embodiments of this application, the application further provides a battery 100 which includes any of the above-described battery cells 20.

[0170] In some embodiments of this application, as shown in Figures 2 and 3, the battery 100 further includes a housing 10 and a pressing bar 30, the pressing bar 30 being housed in the housing 10 together with the battery cell 20 and bonded to the first exposed region 2111.

[0171] Exemplary, in Figure 2, the battery cell 20 is placed inside the housing 10. That is, the second wall 212 of the battery cell 20 is positioned to support the electrode unit 22 in the thickness direction X of the first wall. In other words, the first wall 211 of the housing 21 is provided opposite the top of the housing 10, and the second wall 212 of the housing 21 is provided opposite the bottom of the housing 10. Alternatively, in actual use, the second wall 212 of the housing 21 is provided facing the ground or downwards, such that the thickness direction X of the first wall is vertical.

[0172] The pressing bar 30 is provided between the first wall 211 and the top of the housing 10 in the thickness direction X of the first wall, and is bonded to the first exposed region 2111 formed on the first wall 211.

[0173] Optionally, the pressure bar 30 is made of an insulating material, such as rubber, synthetic resin, or silicone. This structure of the pressure bar 30 enables an insulating connection between the pressure bar 30 and the battery cell 20, reducing the risk of leakage current or short circuits.

[0174] In other embodiments, the battery cell 20 is placed upside down inside the housing 10. That is, the first wall 211 of the battery cell 20 is positioned to support the electrode unit 22 in the thickness direction X of the first wall. As a result, the pressure bar 30 is provided between the first wall 211 and the bottom of the housing 10 in the thickness direction X of the first wall, and is bonded to the first exposed region 2111 formed on the first wall 211.

[0175] The battery 100 is provided with a housing 10 and a pressure bar 30. The pressure bar 30 is bonded to the first exposed area 2111 of the housing 21 of the battery cell 20, thereby fixing the battery cell 20 inside the housing 10 of the battery 100. In this structure, the housing 21 of the battery cell 20 can be directly bonded to the pressure bar 30 without the need for an insulating member 23. This reduces the influence of the insulating member 23 on the bonding between the battery cell 20 and the pressure bar 30, mitigating the risk of the housing 21 and pressure bar 30, which are indirectly bonded via the insulating member 23, becoming detachable and effectively increasing the bonding strength. As a result, the structural stability of the battery cell 20 assembled inside the housing 10 is improved, reducing the risk of the battery cell 20 shaking or becoming detached during use, and enhancing the assembly quality and operational stability of the battery 100.

[0176] In some embodiments, as shown in Figures 2 and 3, the battery 100 includes a plurality of battery cells 20, and the pressing bar 30 is adhered to the first exposed area 2111 of the plurality of battery cells 20.

[0177] The pressure bar 30 is bonded to the first exposed area 2111 of the multiple battery cells 20. That is, one pressure bar 30 is bonded to the first exposed area 2111 of the housing 21 of the multiple battery cells 20.

[0178] Multiple battery cells 20 are provided in the housing 10, and the pressing bar 30 and the first exposed areas 2111 of the multiple battery cells 20 are bonded to each other. As a result, the multiple battery cells 20 can be connected together by the pressing bar 30, which contributes to improving the structural strength and structural stability of the multiple battery cells 20 in the housing 10, and effectively enhances the operating stability of the battery 100.

[0179] In some embodiments of this application, as shown in Figures 2, 3 and 11, the housing 21 further includes a second wall 212 facing the first wall 211 in the thickness direction X of the first wall. The insulating member 23 is further provided with a second cutout region 236 located on the side of the second wall 212 away from the electrode unit 22 in the thickness direction X of the first wall, and the second wall 212 has a second exposed region 2121 formed at a position corresponding to the second cutout region 236, which is bonded to the housing 10.

[0180] For example, the battery cell 20 is placed upright inside the housing 10 such that the second exposed area 2121 formed on the second wall 212 is adhered to the bottom of the housing 10. Alternatively, if the battery cell 20 is placed upside down inside the housing 10, the second exposed area 2121 formed on the second wall 212 will be adhered to the top of the housing 10.

[0181] By bonding the second exposed area 2121 of the housing 21 of the battery cell 20 to the housing 10, the battery cell 20 is more securely fixed within the housing 10. In this structure, the housing 21 of the battery cell 20 is directly bonded to the housing 10 without the need for an insulating member 23, which reduces the influence of the insulating member 23 on the bonding between the battery cell 20 and the housing 10, and effectively increases the bonding strength. Therefore, the structural stability of the battery cell 20 assembled within the housing 10 is improved, the risk of the battery cell 20 shaking or coming loose during use is reduced, and the assembly quality and operational stability of the battery 100 can be improved.

[0182] According to some embodiments of this application, the present application further provides an electrical device which includes any of the above-mentioned batteries 100 for supplying power.

[0183] The electrical device may be an instrument or system that uses any of the above-mentioned batteries 100.

[0184] According to some embodiments of this application, as shown in Figures 3 to 7, the application provides a battery cell 20. The battery cell 20 includes a housing 21, an electrode unit 22, an insulating member 23, and two electrode terminals 25. The housing 21 includes a first wall 211, a second wall 212, and a side wall 213. The first wall 211 faces the second wall 212 in the thickness direction X of the first wall, and the side wall 213 surrounds the second wall 212 and is integrally molded with the second wall 212. An opening 2131 is formed at the end of the side wall 213 away from the second wall 212, and the first wall 211 is an end cover that closes the opening 2131. The electrode unit 22 is housed within the housing 21. The insulating member 23 includes a separately provided first insulating member 233 and a second insulating member 234. The first insulating member 233 covers the outer surface of the first wall 211 away from the electrode unit 22, and the second insulating member 234 covers the outer surface of the second wall 212 away from the electrode unit 22 and the outer surface of the side wall 213 away from the electrode unit 22. The first insulating member 233 is provided with two first cutout regions 231 arranged at intervals along the first direction Y, and a first exposed region 2111 for adhesion to the two pressing bars 30 is formed at positions corresponding to the two first cutout regions 231 on the first wall 211. The second insulating member 234 is provided with a second cutout region 236, and a second exposed region 2121 for adhesion to the housing 10 is formed at a position corresponding to the second cutout region 236 on the second wall 212. The area of ​​the first exposed region 2111 is S1, and S1 ≥ 50 mm 2 The following conditions are met. Two electrode terminals 25 are provided on the first wall 211 and electrically connected to the electrode unit 22. In the first direction Y, the two electrode terminals 25 are located between two first exposed regions 2111. The first insulating member 233 is provided with mounting holes 235 through which the electrode terminals 25 pass, and the minimum distance between each first cutout region 231 and the adjacent mounting hole 235 is D1, satisfying D1 ≥ 0.5 mm.

[0185] Furthermore, the embodiments and features of the embodiments of this application can be combined with each other, provided there are no contradictions.

[0186] The foregoing description is merely a preferred embodiment of this application and does not limit it. Those skilled in the art may have various modifications and changes to this application. Any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and principles of this application shall fall within the scope of protection of this application. [Explanation of symbols]

[0187] 1000 vehicles 100 batteries 10 cabinets 11. Main body of the first enclosure 12. Main body of the second enclosure 20 battery cells 21 Housing 211 The First Wall 2111 1st exposure area 212 The Second Wall 2121 2nd exposure area 213 Side wall 2131 Aperture 22 Electrode Unit 23 Insulating material 231 First cutout area 232 Escape Route 233 First insulating member 234 Second insulating member 2341 Folding section 2341a First segment 2341b Second segment 2341c Third Segment 2341d 4th segment 235 mounting holes 236 Second cutout area 24 Pressure relief mechanism 25 Electrode terminal 30 Pressure bars 200 controllers 300 motor X Thickness direction of the first wall Y First direction Z 2nd direction

Claims

1. The housing including the first wall, The electrode unit housed in the aforementioned housing, An insulating member covers the outside of the housing and covers the outer surface of the first wall that is separated from the electrode unit in the thickness direction of the first wall, Includes, The insulating member is provided with a first cutout region located on the side of the first wall away from the electrode unit in the thickness direction of the first wall, and the first wall has a first exposed region formed at a position corresponding to the first cutout region for connection to the pressing bar. Battery cell.

2. The area of ​​the first exposed region is S, and S ≥ 50 mm ２ satisfies The battery cell according to claim 1.

3. The minimum distance between the first exposed area and the edge of the first wall is D １ Therefore, 1 mm ≤ D １ Satisfying ≤ 5 mm The battery cell according to claim 1.

4. The housing further includes a second wall facing the first wall in the thickness direction of the first wall, and side walls surrounding the first wall and the second wall. The insulating member includes a first insulating member and a second insulating member provided separately, the first insulating member covering the outer surface of the first wall away from the electrode unit, and the second insulating member covering the outer surface of the second wall away from the electrode unit and the outer surface of the side wall away from the electrode unit. A battery cell according to any one of claims 1 to 3.

5. The first cutout region is provided in the first insulating member. The battery cell according to claim 4.

6. The second insulating member is provided in the circumferential direction of the first wall and has a bent portion located on the side of the first wall away from the electrode unit, and the bent portion and the edge of the first insulating member together form the first cutout region. The battery cell according to claim 4.

7. A portion of the bent portion is located between the first wall and the first insulating member in the thickness direction of the first wall. The battery cell according to claim 6.

8. The first insulating member and the bent portion together form two first cutout regions, and in a first direction perpendicular to the thickness direction of the first wall, the two first cutout regions are located at both ends of the first insulating member, respectively. The battery cell according to claim 6.

9. The bent portion includes a first segment, a second segment, a third segment, and a fourth segment that are sequentially connected in the circumferential direction of the first wall. In the first direction, the first segment and the third segment face each other, in the second direction, the second segment and the fourth segment face each other, and the first direction, the second direction and the thickness direction of the first wall are orthogonal to each other. The first insulating member is located between the first segment and the third segment in the first direction, and one first cutout region is formed by the first segment, a part of the second segment, a part of the fourth segment, and one end of the first insulating member in the first direction, and another first cutout region is formed by the third segment, a part of the second segment, a part of the fourth segment, and the other end of the first insulating member in the first direction. The battery cell according to claim 8.

10. The second wall and the side wall are integrally molded structures, and in the thickness direction of the first wall, one end of the side wall is connected to the second wall and the other end is formed as an opening, and the first wall is an end cover that closes the opening. The battery cell according to claim 4.

11. The battery cell further includes electrode terminals provided on the first wall and electrically connected to the electrode unit, The insulating member is provided with mounting holes through which the electrode terminals are drilled, and the mounting holes are spaced apart from the first cutout area. A battery cell according to any one of claims 1 to 3.

12. The minimum distance between the first cutout area and the mounting hole is D ２ And D ２ Satisfying ≥ 0.5 mm The battery cell according to claim 11.

13. The insulating member is provided with two first cutout regions arranged along the first direction so as to form two first exposed regions on the first wall, arranged along the first direction perpendicular to the thickness direction of the first wall. Two electrode terminals are provided on the first wall, arranged along the first direction and located between two of the first cutout regions, and in the first direction, the minimum distance between each of the first cutout regions and the adjacent mounting hole is D ２ That is The battery cell according to claim 12.

14. The insulating member is provided with two first cutout regions arranged along the first direction so as to form two first exposed regions on the first wall, arranged along the first direction perpendicular to the thickness direction of the first wall. In the first direction, the electrode terminal is located between the two first exposed regions. The battery cell according to claim 11.

15. The housing further includes a second wall facing the first wall in the thickness direction of the first wall, The battery cell further includes two electrode terminals provided on the first wall and the second wall, respectively, and electrically connected to the electrode unit. A battery cell according to any one of claims 1 to 3.

16. The housing further includes a second wall facing the first wall in the thickness direction of the first wall, The insulating member is further provided with a second cutout region located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed region formed at a position corresponding to the second cutout region for connection to the housing. A battery cell according to any one of claims 1 to 3.

17. A battery comprising a battery cell according to any one of claims 1 to 3.

18. The battery further includes a housing and a pressing bar, the pressing bar being housed in the housing together with the battery cell and bonded to the first exposed area. The battery according to claim 17.

19. The battery comprises a plurality of the battery cells, and the pressing bar is bonded to the first exposed area of ​​the plurality of the battery cells. The battery according to claim 18.

20. The housing further includes a second wall facing the first wall in the thickness direction of the first wall, The insulating member is further provided with a second cutout region located on the side of the second wall away from the electrode unit in the thickness direction of the first wall, and the second wall has a second exposed region formed at a position corresponding to the second cutout region, which is bonded to the housing. The battery according to claim 18.

21. An electrical device including a battery as described in claim 17.

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