Battery and electrical device

Abstract

Battery comprising: a battery cell; a first housing, the first housing comprising a first end wall and a first side wall; a second housing, the second housing being connected to the first housing to form an enclosed space for receiving the battery cell, the second housing having a second end wall, the second end wall being opposite the first end wall in a first direction, the second end wall having a first side surface in a second direction, the first direction intersecting the second direction; one end of the first side wall being connected to the first end wall and the other end being connected to the first side surface.

Description

AREA OF INVENTION The present application relates to the field of battery technology and in particular to a battery and an electrical device. STATE OF THE ART Energy saving and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles have become an important component of this development due to their energy-saving and environmentally friendly advantages. Battery technology is a crucial factor in the development of electric vehicles. In the development of battery technology, the question of how to improve the energy density of batteries is a pressing technical problem in battery technology that needs to be solved. REVELATION OF THE INVENTION This application provides a battery and an electrical device that can improve the battery's energy density. This application is realized by the following technical solution: In a first aspect, this application provides a battery comprising: a battery cell; a first housing, the first housing comprising a first end wall and a first side wall; a second housing, the second housing being connected to the first housing to form an enclosed space for receiving the battery cell, the second housing having a second end wall, the second end wall being opposite the first end wall in a first direction, the second end wall having a first side surface in a second direction, the first direction intersecting the second direction; one end of the first side wall being connected to the first end wall, and the other end being connected to the first side surface.In the solution described above, the connection between the first and second housings is established by joining one end of the first side wall of the first housing to the first side surface of the second end wall. This connection between the first and second housings can be achieved without a flange projecting in the second direction, thus improving the battery's space utilization in that direction. This allows for the accommodation of more battery cells or a reduction in battery volume, thereby increasing the battery's volumetric energy density. According to some embodiments of this application, the inner surface of the first side wall is connected to the first side surface. In the solution described above, by connecting the inner surface of the first side wall, i.e. the surface facing the first side surface, with the first side surface, the size of the battery in the second direction can be effectively reduced in order to maximize the volumetric energy density of the battery. According to some embodiments of this application, the second end wall has a first surface facing the first end wall, and in the direction from the first end wall to the second end wall, an end of the first side wall facing away from the first end wall projects beyond the first surface. In the solution described above, the end of the first side wall facing away from the first end plate extends beyond the first surface, thus enabling a direct connection between the first side wall and the first side surface. This reduces both the assembly effort and manufacturing costs that would result from an indirect connection between the first side wall and the first side surface via an intermediate connector. Furthermore, the inner surface of the portion of the first end wall extending beyond the first surface can be connected to the first side surface, effectively reducing the battery's size in the second direction and thereby maximizing its volumetric energy density. According to some embodiments of this application, the second end wall has a second surface facing away from the first end wall, and in the direction from the first end wall to the second end wall, an end of the first side wall facing away from the first end wall does not project beyond the second surface. In the solution described above, the end of the first side wall facing away from the first end wall does not extend beyond the second surface, thus limiting the size of the battery in the first direction and ensuring a high volumetric energy density of the battery. According to some embodiments of this application, the material density of the first housing is lower than the material density of the second housing. Since the first side wall is connected to the first side surface in the solution described above, the proportion of the battery within the first housing increases. Because the material density of the first housing is lower than that of the second housing, the battery density decreases. For the same volume, the battery weight decreases, thus increasing the battery's gravimetric energy density. According to some embodiments of this application, the first housing is made of plastic and the second housing is made of an aluminum alloy. In the solution described above, the first casing can be the upper casing and the second casing the lower casing of the battery. The second casing is made of an aluminum alloy, which gives it high strength and rigidity, providing optimal protection for the battery cells. The first casing, serving as the upper casing, seals the space between the battery cells and the upper and lower casings. It is made of plastic, which effectively reduces the battery's manufacturing costs and weight, thereby increasing its gravimetric energy density. According to some embodiments of this application, the battery further comprises a first fastening element, wherein the first side wall is connected to the first side surface by the first fastening element. In the solution described above, attaching the first fastening element to connect the first side wall to the first side surface improves the connection stability between the first side wall and the first side surface, thereby increasing the structural stability of the battery. According to some embodiments of this application, the first side wall is provided with a first through hole, the first side surface is provided with a first threaded hole, and the first fastening element passes through the first through hole and is connected to the first threaded hole. In the solution described above, the first fastening element can be a connecting part with an external thread, such as a screw or bolt, which can be effectively connected to the first threaded hole, thereby improving the connection stability between the first side wall and the first side surface and ensuring a good seal between the first side wall and the first side surface. According to some embodiments of this application, the battery further comprises a first seal, wherein the first seal is arranged between the first side wall and the first side surface. In the solution described above, by providing the first seal in front of the first side wall and the first side surface, the sealing between the first side wall and the first side surface can be improved, thus improving the sealing of the battery. According to some embodiments of this application, there are two first side walls, wherein the two first side walls are opposite each other along the second direction; the second end wall is located between the two first side walls, wherein the second end wall has two first side surfaces that are opposite each other along the second direction; the first side surfaces and the first side walls correspond one to one. In the solution described above, there are two first side walls that face each other in the second direction and are each connected to the corresponding first side surfaces. This effectively improves the space utilization of the battery in the second direction and thus increases the volumetric energy density of the battery. According to some embodiments of this application, the second housing further comprises two second side walls, wherein the two second side walls are opposite each other in the second direction and are connected to the second end wall, wherein the battery cell is arranged between the two second side walls. In the solution described above, two opposing second sidewalls are provided along the second end wall in the second direction. This improves the structural stability of the second housing and defines the installation space for the battery cells, allowing them to be stably mounted within the second housing. Since the second sidewall extends beyond the surface of the second end wall, the adhesive space can be effectively limited when the battery cell is bonded to the second housing with adhesive. This reduces the risk of adhesive waste and environmental pollution from leaking adhesive. According to some embodiments of this application, the first housing has openings at both ends along a third direction; the second housing also comprises two third side walls, the two third side walls being opposite each other along the third direction and connected to the second end wall, the two third side walls each closing the two openings; the first direction, the second direction and the third direction intersect in pairs. In the solution described above, the arrangement of the third side walls allows, on the one hand, the installation of components such as explosion protection valves, water cooling connections, or high and low voltage connectors on the third side walls to ensure normal charging and discharging of the battery; on the other hand, compared to the flange structure that protrudes in the third direction between the first and second housings, the arrangement of the third side walls to close the opening improves the space utilization of the battery in the third direction and increases the volumetric energy density of the battery. According to some embodiments of this application, the third side wall comprises a third surface facing the enclosed space, a fourth surface facing away from the enclosed space, and a second side surface connecting the third surface and the fourth surface. The first housing comprises two connecting parts, each of which is located at both ends of the first housing along the third direction, the connecting parts forming the opening, and the connecting parts being connected to the second side surface. In the solution described above, the arrangement of the connecting part for the connection with the second side surface of the third side wall ensures the connection stability and sealing between the first housing and the second housing. According to some embodiments of this application, the second side surface comprises a first flat surface, a second flat surface, and a transition surface. The first flat surface is located at one end of the third side wall facing away from the second end wall. The two second flat surfaces are located at the two ends of the third side wall along the second direction. The transition surface connects the first flat surface and the second flat surface to provide a smooth transition between the first and second flat surfaces. In the solution described above, the first and second flat surfaces are not coplanar. Therefore, the inclusion of a transition surface allows for a smooth transition between the first and second flat surfaces. This promotes the formation of an effective sealing surface between the connecting part and the second side surface, resulting in a high degree of sealing for the battery. According to some embodiments of this application, the second flat surface is flush with the first side surface. In the solution described above, the second flat surface is flush with the first side surface. This reduces the risk of gaps between the first side wall and the second side surface, as well as the risk of gaps between the connecting part and the second flat surface, thus improving the battery's seal. According to some embodiments of this application, the first housing further comprises a fourth side wall, wherein the fourth side wall adjoins the first side wall; one end of the fourth side wall is connected to the first end wall, and at the other end of the fourth side wall there is a connecting part, wherein the connecting part projects away from the fourth side wall in the direction of the enclosed space. In the solution described above, the first casing can be the upper casing and the second casing the lower casing. During the battery manufacturing process, the material costs and density of the upper casing can be lower than those of the lower casing. By adding the fourth side wall, which increases the proportion of the first casing in the battery, the manufacturing costs of the battery can be effectively reduced and the gravimetric energy density increased. According to some embodiments of this application, the battery further comprises a second fastening element, and the connecting part is connected to the second side surface via the second fastening element. In the solution described above, the arrangement of the second fastening element to connect the second side surface to the connecting part improves the connection stability between the connecting part and the second side surface, thereby increasing the structural stability of the battery. According to some embodiments of this application, the connecting part is provided with a second through-hole, the second side surface is provided with a second threaded hole, and the second fastening element passes through the second through-hole and is connected to the second threaded hole. In the solution described above, the second fastening element can be a connecting part with an external thread, such as a screw or bolt, which can be effectively connected to the second threaded hole, thereby improving the connection stability between the connecting part and the second side surface and ensuring a good seal between the connecting part and the second side surface. According to some embodiments of this application, the battery further comprises a second seal, wherein the second seal is arranged between the connecting part and the second side surface. In the solution described above, providing a second seal between the connecting part and the second side surface improves the sealing between the wall of the connecting part and the second side surface, thus improving the sealing of the battery. According to some embodiments of this application, the battery further comprises a first seal, wherein the first seal is arranged between the first side wall and the first side surface; wherein the two ends of the first seal are each connected to two second seals. In the solution described above, the first and second seals can be formed as a single piece or joined separately. The arrangement of the first and second seals ensures a good seal between the first and second housings, thus improving battery safety. According to some embodiments of this application, the dimension of one of the third side walls along the first direction is smaller than the dimension of the other third side wall along the first direction. In the solution described above, the larger third side panel can be used to install components such as explosion-proof valves, water cooling connections, or high- and low-voltage connectors to ensure normal battery charging and discharging. By reducing the dimensions of the other third side panel, the size of the first housing can be adjusted accordingly. This increases the proportion of the first housing in the battery (in this embodiment, the first housing can be an upper housing with lower material costs and lower density). This reduces the battery's manufacturing costs and increases its gravimetric energy density. According to some embodiments of this application, the second end wall is provided with a mounting part for attaching the battery to an electrical device. In the solution described above, a mounting part is provided on the second end wall to ensure stable battery mounting and to guarantee that the battery supplies power. In a second aspect, this application further provides an electrical device comprising a battery according to one of the embodiments of the first aspect, wherein the battery serves to provide electrical energy. The above description merely provides an overview of the technical solution of this application. To better understand the technical means of this application and to implement them according to the descriptions, as well as to clarify the aforementioned and other objectives, features, and advantages of this application, specific examples of its implementation are listed below. DESCRIPTION OF THE FIGURES To more clearly illustrate the technical solutions of the embodiments of the present application, the figures used in the embodiments are briefly presented below. It is understood that the following figures show only some embodiments of the present application and should therefore not be considered as limiting the scope of protection. A person skilled in the art in this field can draw further relevant figures based on these figures without inventive step. Fig. 1 is a schematic representation of a vehicle according to some embodiments of the present application; Fig. 2 is a schematic representation of a battery in some embodiments of the present application; Fig. 3 is an exploded view of a battery in some embodiments of the present application; Fig. 4 is a schematic representation of the first housing in some embodiments of this application; Fig.Figure 5 is a schematic representation of the second housing in some embodiments of this application; Figure 6 shows an enlarged view of part A in Figure 5; Figure 7 is a partial schematic representation of the first housing in some embodiments of this application; Figure 8 is a schematic representation of the third side wall in some embodiments of this application; Figure 9 is a partial schematic representation of the first housing in other embodiments of this application; Figure 10 is a partial schematic representation of the second housing in other embodiments of this application; Figure 11 is a schematic representation of the second housing in further embodiments of this application. Reference symbols: 100 - battery; 1000 - vehicle; 200 - control unit; 300 - motor; 10 - first housing; 11 - first end wall; 12 - first side wall; 120 - first through hole; 13 - opening; 14 - connecting part; 140 - second through hole; 15 - fourth side wall; 20 - second housing; 21 - second end wall; 210 - first side surface; 2100 - first threaded hole; 211 - first surface; 212 - second surface; 22 - second side wall; 23 - third side wall; 230 - third surface; 231 - fourth surface; 232 - second side surface; 2320 - first flat surface; 2321 - second flat surface; 2322 - transition surface; 2323 - second threaded hole; 24 - cross member; 30 - first seal; 31 - second seal; 40 - mounting part; z - first direction; x - second direction; y - third direction. DETAILED DESCRIPTION OF THE EXECUTION FORMS The embodiments of this application are described in more detail below with reference to the figures and exemplary embodiments. The following detailed description and the figures of the exemplary embodiments serve to illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described exemplary embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as they are generally understood by those skilled in the technical field to which the present application belongs; the terms used herein serve only the purpose of describing specific embodiments and are not intended to limit the application; the terms "comprising" and "incorporating" and all variations thereof in the description, the claims and the preceding description of the figures are intended to include non-exclusive inclusion. In the description of embodiments of this application, technical terms such as "first", "second", etc., serve solely to distinguish between different objects and should not be understood as indicating or suggesting a relative importance or as an implicit indication of the number of the technical features mentioned, a particular order, or a relationship of superior or subordinate importance. In the description of embodiments of this application, "several" means two or more, unless expressly stated otherwise. The term “embodiments” in this document means that the specific features, structures, or properties described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase at different points in the description does not necessarily mean that it is the same embodiment, nor does it mean that it is an independent or alternative embodiment that is mutually exclusive with other embodiments. People skilled in the art in this field understand, expressly and implicitly, that the embodiments described in this document may be combined with other embodiments. In the description of the embodiments of this application, the term "and / or" serves only to describe the relationship between related objects and indicates that there can be three types of relationships, e.g., A and / or B, which can represent the following: A exists, A and B exist simultaneously, and B exists. Furthermore, the character " / " in this document generally indicates that the objects preceding and following it are in an "or" relationship. In the description of embodiments of this application, “several” refers to two or more (including two), likewise “several groups” refers to two groups or more (including two groups) and “several plates” refers to two plates or more (including two plates). In the description of the embodiments of this application, technical terms such as "length", "width", "thickness", "top", and "bottom" denote the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They serve only to simplify the description of the embodiments of this application and do not imply that the device or element in question must have a specific orientation or be designed and operated in a specific orientation. Therefore, they are not to be interpreted as limitations of the embodiments of this application. In the description of the embodiments of this application, unless expressly stated and defined otherwise, the technical terms "assembly", "connection", "connection", and "fastening" are to be interpreted broadly. They may, for example, denote a permanent, a detachable, or an integral connection; they may denote a direct or an indirect connection via an intermediate medium; and they may denote the internal connection of two components. Those skilled in the field will be able to understand the specific meaning of the aforementioned terms in the embodiments of this application based on the specific context. The battery mentioned in the embodiments of this application is a single physical module consisting of one or more battery cells to achieve a higher voltage and capacity. The battery mentioned in this application may, for example, contain one or more battery cells. The battery further comprises a first housing and a second housing, the first housing and the second housing forming an enclosed space. The battery cells are housed in this enclosed space to prevent liquids or other foreign matter from interfering with the charging or discharging process of the battery cells. In the development of battery technology, the question of how to improve battery energy density is a pressing technical problem. The inventors discovered that both the first and second casings of a battery have outward-projecting flange structures at their edges. These flange structures connect the first and second casings, ensuring a tight seal. However, the protruding flange structures require additional space, reducing the battery's usable volume and negatively impacting its volumetric energy density. To solve the problem that the protruding flange structure requires additional space, resulting in reduced battery space utilization and impaired energy density, the inventors conducted in-depth research and developed a battery with a first housing and a second housing. The first housing has a first end wall and a first side wall. The second housing comprises a second end wall. The first and second end walls are aligned opposite each other in a first direction. The second end wall has a first side surface in a second direction. The first direction intersects the second direction. The first side surface of the first housing is connected to the first side surface of the second end wall. In the solution described above, the outwardly projecting flange structure of the battery is eliminated, so that the first side wall is connected to the first side surface. This saves the space wasted by the flange structure and improves the battery's space utilization in the second direction, allowing either more battery cells to be accommodated or the battery volume to be reduced, thereby increasing the battery's volumetric energy density. The battery disclosed in the embodiments of this application can, but is not limited to, be used in battery cabinets, containerized energy storage systems, etc. The energy storage systems can comprise several batteries disclosed in this application. The battery disclosed in the embodiments of this application can, but is not limited to, be used in electrical equipment such as vehicles, ships, or aircraft. The batteries disclosed in this application can be used to form the power supply system of the electrical equipment. The embodiments of this application provide an electrical device that uses a battery as an energy source. The electrical device can include, among other things, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, trucks, buses, spacecraft, etc. Electric toys include, among other things, stationary and mobile electric toys such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft include, among other things, airplanes, rockets, space shuttles, and spacecraft. To simplify the explanation, the following embodiments are described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application. See Fig. 1. Fig. 1 is a schematic representation of a vehicle according to some embodiments of the present application. Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. The type of vehicle 1000 can be, for example, a sedan, an SUV, a truck, or a bus. The vehicle 1000 is equipped with an internal battery 100, which can be located at the bottom, at the front, or at the rear of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 1000 can be used as an operating current source for the vehicle 1000, for the electrical system of the vehicle 1000, for example, to meet the energy requirements of the vehicle 1000 during the starting process, navigation, and operation. The vehicle 1000 can also include a control unit 200 and a motor 300, the control unit 200 serving to control the battery 100 in order to supply power to the motor 300, for example to meet the energy requirements of the vehicle 1000 during the starting process, navigation and driving. In some embodiments of this application, the battery 100 can serve not only as an operating current source for the vehicle 1000, but also as a drive current source for the vehicle 1000, whereby heating oil or natural gas is wholly or partially replaced to provide drive energy for the vehicle 1000. According to some embodiments of this application, this application provides a battery 100. See Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. 6. Fig. 2 is a schematic representation of a battery in some embodiments of the present application. Fig. 3 is an exploded view of a battery 100 in some embodiments of the present application. Fig. 4 is a schematic representation of the first housing 10 in some embodiments of this application. Fig. 5 is a schematic representation of the second housing 20 in some embodiments of this application. Fig. 6 shows an enlarged view of part A in Fig. 5. The battery 100 comprises a battery cell (not shown in the figure), a first housing 10, and a second housing 20. The first housing 10 comprises a first end wall 11 and a first side wall 12. The second housing 20 is connected to the first housing 10 to form an enclosed space for the battery cell. The second housing 20 has a second end wall 21, which is opposite the first end wall 11 in the first z direction. The second end wall 21 has a first side surface 210 in the second x direction, with the first z direction intersecting the second x direction. One end of the first side wall 12 is connected to the first end wall 11, and the other end is connected to the first side surface 210. In some embodiments, the first housing 10 can be considered the upper housing of the battery 100, the first end wall 11 the upper wall of the battery 100, and the first side wall 12 a part which is connected at one end to the first end wall 11 but is not in the same plane as the first end wall 11; the first side wall 12 may be connected to the first end wall 11 by welding or gluing. The second casing 20 can be considered the lower casing of the battery 100, the second end wall 21 can be considered the bottom wall of the battery 100, the first direction z can be the vertical direction of the battery 100, that is, the upper wall and the bottom wall are arranged opposite each other in the vertical direction of the battery 100, and the first side surface 210 can be the surface of the bottom wall in the second direction x. The first casing 10 and the second casing 20 are connected to each other and form an enclosed space that can accommodate individual battery cells. The first direction z intersects the second direction x, which can mean that the first direction z and the second direction x are not parallel. Accordingly, the first side surface 210 can be understood as the surface of the second end wall 21, which is neither facing towards nor away from the first end wall 11. The wording “One end of the first side wall 12 is connected to the first end wall 11, and the other end is connected to the first side surface 210” can mean that the first side wall 12 connects the first end wall 11 and the second end wall 21, and that the end of the first side wall 12 facing away from the first end wall 11 is directly or indirectly connected to the first side surface 210. This can be understood to mean that the connecting surface between the first side wall 12 and the first end wall 11 lies on the first side surface 210 and does not project beyond the outer contour of the first housing 10 and the second housing 20 in the second direction x.The wording “The end of the first side wall 12 facing away from the first end wall 11 is directly or indirectly connected to the first side surface 210” can mean that the first side wall 12 is directly connected to the first side surface 210 or that the first side wall 12 is indirectly connected to the first side surface 210 via an intermediate connector. In the solution described above, the connection between the first housing 10 and the second housing 20 is established by connecting one end of the first side wall 12 of the first housing 10 with the first side surface 210 of the second end wall 21. This connection between the first housing 10 and the second housing 20 can be realized without a flange projecting in the second direction x, thereby improving the space utilization of the battery 100 in the second direction x. This allows for the accommodation of more battery cells or a reduction in battery volume, thus increasing the volumetric energy density of the battery 100. According to some embodiments of this application, the inner surface of the first side wall 12 is connected to the first side surface 210. The inner surface of the first side wall 12 can be described as the surface of the first side wall 12 facing the interior of the battery 100. The phrase "The inner surface of the first side wall 12 is connected to the first side surface 210" can mean that the connection between the inner surface of the first side wall 12 and the first side surface 210 is a surface-to-surface connection. In the solution described above, by connecting the inner surface of the first side wall 12, i.e. the surface facing the first side surface 210, with the first side surface 210, the size of the battery 100 in the second direction x can be effectively reduced in order to maximize the volumetric energy density of the battery 100. According to some embodiments of this application, as shown in Fig. 5 and Fig. 6, the second end wall 21 has a first surface 211 facing the first end wall 11 and in the direction from the first end wall 11 to the second end wall 21, an end of the first side wall 12 facing away from the first end wall 11 projects beyond the first surface 211. The second end wall 21 has a first surface 211 in the first direction z, and the first surface 211 is the surface of the second end wall 21 facing the first end wall 11. The first surface 211 can be considered the upper surface of the second end wall 21. In some embodiments, the battery cell is located between the first surface 211 and the first end wall 11. The formulation “In the direction from the first end wall 11 to the second end wall 21, an end of the first side wall 12 facing away from the first end wall 11 projects beyond the first surface 211” can mean that the orthogonal projection of the first side wall 12 onto the plane of the first side surface 210 overlaps with the first side surface 210. The area of ​​overlap between the first side wall 12 and the first side surface 210 can be the area where the first side wall 12 and the first side surface 210 are connected. In the solution described above, the end of the first side wall 12 facing away from the first end plate projects beyond the first surface 211, thus enabling a direct connection between the first side wall 12 and the first side surface 210. This reduces the assembly effort and manufacturing costs that would result from an indirect connection between the first side wall 12 and the first side surface 210 via an intermediate connector. Furthermore, the inner surface of the portion of the first end wall 11 projecting beyond the first surface 211 can be connected to the first side surface 210, which in turn effectively reduces the size of the battery 100 in the second direction x, thereby maximizing the volumetric energy density of the battery 100. According to some embodiments of this application, as shown in Fig. 5 and Fig. 6, the second end wall 21 has a second surface 212 facing away from the first end wall 11, and in the direction from the first end wall 11 to the second end wall 21, an end of the first side wall 12 facing away from the first end wall 11 does not project beyond the second surface 212. The second end wall 21 has a second surface 212 in the first direction z, and the second surface 212 is the surface of the second end wall 21 facing away from the first end wall 11. The second surface 212 can be considered the lower surface of the second end wall 21. The wording “In the direction from the first end wall 11 to the second end wall 21, an end of the first side wall 12 facing away from the first end wall 11 does not project beyond the second surface 212” can mean that the end of the first side wall 12, which is away from the first end wall 11, is flush with the second surface 212 or is located between the second surface 212 and the first end wall 11. In the solution described above, the end of the first side wall 12 facing away from the first end wall 11 does not extend beyond the second surface 212, so that the size of the battery 100 is limited in the first direction z and thus a high volumetric energy density of the battery 100 is ensured. In some embodiments, as shown in Fig. 3, the second direction x is the width direction of the battery 100. The battery 100 can be square, and it can have height, width, and length directions. The height direction of the battery 100 can be the first direction z, i.e., the direction in which the first end wall 11 and the second end wall 21 face each other. The width and length directions of the battery 100 can be perpendicular to each other and both perpendicular to the height direction. The length dimension of the battery 100 is generally greater than its width dimension. In some embodiments, the side face of the battery 100 in the width direction is the larger surface area of ​​the battery 100. The first casing 10 can form the upper casing of the battery 100.In the manufacturing process of battery 100, the material costs and density of the upper casing can be lower than those of the lower casing. If the second direction x is the width direction of battery 100, the first side wall 12 can be considered the large surface area (the larger surface area) of battery 100. This can significantly reduce the material costs of battery 100, thereby reducing the manufacturing costs and significantly decreasing the weight of battery 100, which increases the gravimetric energy density of battery 100. According to some embodiments of this application, the material density of the first housing 10 is lower than the material density of the second housing 20. Material density is the mass per unit volume of a material under a specific volume state. Since, in the solution described above, the first side wall 12 is connected to the first side surface 210, the proportion of battery 100 in the first housing 10 increases. Because the material density of the first housing 10 is lower than that of the second housing 20, the density of battery 100 decreases. For the same volume, the weight of battery 100 decreases, thereby increasing the gravimetric energy density of the battery. In some other embodiments, the material density of the first housing 10 can also be equal to or greater than the material density of the second housing 20. According to some embodiments of this application, the first housing 10 is made of plastic and the second housing 20 is made of an aluminum alloy. Plastic is less expensive than aluminum alloy and also has a lower density. Aluminum alloy has higher strength and stiffness than plastic. In the solution described above, the first casing 10 can be the upper casing of the battery 100, and the second casing 20 can be the lower casing of the battery 100. The second casing 20 is made of an aluminum alloy, which gives it high strength and rigidity, providing optimal protection for the battery cells. The first casing 10, serving as the upper casing, seals the space between the battery cells and the upper and lower casings. It is made of plastic, which effectively reduces the manufacturing costs and weight of the battery 100, thereby increasing its gravimetric energy density. In some other embodiments, the first housing 10 can also be made of materials such as aluminum, aluminum alloy, steel, or stainless steel. In some other embodiments, the second housing 20 can also be made of materials such as plastic, aluminum, steel, or stainless steel. According to some embodiments of this application, the battery 100 further comprises a first fastening element (not shown in the figure), and the first side wall 12 is connected to the first side surface 210 by means of the first fastening element. The first fastening element is a connecting part 14 that connects the first side wall 12 to the first side surface 210. In some embodiments, the first fastening element can be a rivet, screw, bolt, or other connecting part. In other embodiments, the first fastening element can also be an adhesive layer arranged between the first side wall 12 and the first side surface 210. In the solution described above, the attachment of the first fastening element to connect the first side wall 12 with the first side surface 210 ensures the connection stability of the first side wall 12 and the first side surface 210, thereby guaranteeing the structural stability of the battery 100. According to some embodiments of this application, with reference to Fig. 6 and Fig. 7, Fig. 7 is a partial schematic representation of the first housing 10 in some embodiments of this application. The first side wall 12 is provided with a first through-hole 120, the first side surface 210 is provided with a first threaded hole 2100, and the first fastening element passes through the first through-hole 120 and is connected to the first threaded hole 2100. The first through-hole 120 is a hole-like structure that penetrates the outer and inner surfaces of the first side wall 12. The phrase "The first side surface 210 is provided with a first threaded hole 2100" can refer to a hole-like structure with an internal thread on the first side surface 210, such as a self-tapping thread; or it can refer to the threaded hole of a rivet nut or a press nut on the first side surface 210. With reference to Fig. 6 and Fig.7. Several first through holes 120 may be present, wherein the several first through holes 120 are spaced apart along the extension direction of the first side wall 12 (the extension direction of the first side wall 12 is perpendicular to the first direction z and to the second direction x); furthermore, several first threaded holes 2100 may be present, wherein the first threaded holes 2100 correspond to the first through holes 120. The wording “The first fastening element passes through the first through hole 120 and is connected to the first threaded hole 2100” can mean that the first fastening element has an external thread that fits with the first threaded hole 2100, so that it can be screwed into the first threaded hole 2100. In the solution described above, the first fastening element can be a connecting part 14 with an external thread, such as a screw or a bolt, which can be effectively connected to the first threaded hole 2100, so that the first side wall 12 and the first side surface 210 have a high connection stability and the first side wall 12 and the first side surface 210 have a good seal. According to some embodiments of this application, as shown in Fig. 3, the battery 100 further comprises a first seal 30, wherein the first seal 30 is arranged between the first side wall 12 and the first side surface 210. The first seal 30 can be a component with sealing properties and is arranged between the first side wall 12 and the first side surface 210. In some embodiments, the first seal 30 can be a sealing compound or a sealing washer, and the first seal 30 is clamped between the first side wall 12 and the first side surface 210. In the solution described above, by providing the first seal 30 in front of the first side wall 12 and the first side surface 210, the sealing between the first side wall 12 and the first side surface 210 can be improved, and thus the sealing of the battery 100 can be improved. According to some embodiments of this application, as shown in Fig. 3, Fig. 4 and Fig. 7, there are two first side walls 12, the two first side walls 12 being opposite each other along the second direction x. The second end wall 21 is located between the two first side walls 12 and the second end wall 21 has two first side surfaces 210 that are opposite each other along the second direction x. The first side surfaces 210 and the first side walls 12 correspond one-to-one. In some embodiments, there are two first side walls 12, the two first side walls 12 being opposite each other in the second direction x to correspond to the two first side surfaces 210 of the second end wall 21, which are opposite each other in the second direction x. The second end wall 21 is located between the two first side walls 12. This can be understood to mean that the outer contour of the battery 100 in the second direction x is defined by the two first side walls 12. In the solution described above, there are two first side walls 12 that are opposite each other in the second direction x and are each connected to the corresponding first side walls 210. This effectively improves the space utilization of the battery 100 in the second direction x and thus increases the volumetric energy density of the battery 100. In some other embodiments, the number of first side walls 12 can be one. This single first side wall 12 can save space on one side of the battery 100 in the second direction x. According to some embodiments of this application, as shown in Fig. 6, the second housing 20 further comprises two second side walls 22, wherein the two second side walls 22 are opposite each other in the second direction x and are connected to the second end wall 21, wherein the battery cell is arranged between the two second side walls 22. The second side wall 22 is a component located at the second end wall 21. The second side wall 22 can be connected to the second end wall 21 by welding or bonding. The second end wall 21 has a first surface 211 facing the first end wall 11, and the second side wall 22 projects from the first surface 211 towards the second end wall 21 and the first end wall 11. In some embodiments, the outer surface of the second side wall 22 can be flush with the first side wall 210. In the solution described above, two opposing second side walls 22 are provided on the second end wall 21 along the second direction x. This improves the structural stability of the second housing 20 and defines the installation space for the battery cells, allowing them to be mounted in an orderly manner within the second housing 20. Since the second side wall 22 extends beyond the surface of the second end wall 21, the adhesive space can be effectively limited when the battery cell is bonded to the second housing 20. This reduces the risk of adhesive waste and environmental pollution from leaking adhesive. According to some embodiments of this application, reference is made to Figs. 4 and 7. The first housing 10 has openings 13 at both ends along a third direction y. See Fig. 5. The second housing 20 further comprises two third side walls 23, the two third side walls 23 being opposite each other in the third direction y and connected to the second end wall 21, the two third side walls 23 each closing the two openings 13. The first direction z, the second direction x, and the third direction y intersect in pairs. If the first direction z is the vertical direction of battery 100 and the second direction x is the horizontal direction of battery 100, then the third direction y can be the longitudinal direction of battery 100. The third side wall 23 is a component arranged on the second end wall 21. The third side wall 23 can be connected to the second end wall 21 by welding or bonding. The second end wall 21 has a first surface 211 facing the first end wall 11, and the third side wall 23 projects from the first surface 211 towards the second end wall 21 and the first end wall 11. The third side wall 23 can provide structural strength to the first housing 10. In some embodiments, the third side wall 23 can be used for installing components such as explosion protection valves, water cooling connections, or high- and low-voltage connectors to ensure the normal charging and discharging of the battery 100. The openings 13 formed at both ends of the first housing 10 along the third direction y can serve as recesses in the third side wall 23. The third side wall 23 closes the openings 13 to prevent additional mutual obstructions or overlaps of the battery 100. This improves the material utilization of the battery 100 and reduces its manufacturing costs. At the same time, it avoids wasted space due to additional mutual obstructions or overlaps of the battery 100. In some embodiments, the cross-section of the first housing 10 can be U-shaped. In the solution described above, the arrangement of the third side walls 23 allows, on the one hand, the installation of components such as explosion protection valves, water cooling connections or high and low voltage connectors on the third side walls 23 to ensure the normal charging and discharging of the battery 100; on the other hand, compared to the flange structure that protrudes in the third direction y between the first housing 10 and the second housing 20, the arrangement of the third side walls 23 to close the opening 13 improves the space utilization of the battery 100 in the third direction y and increases the volumetric energy density of the battery 100. According to some embodiments of this application, with reference to Figs. 7 and 8, Fig. 8 is a schematic representation of the third side wall 23 in some embodiments of this application. The third side wall 23 comprises a third surface 230 facing the enclosed space, a fourth surface 231 facing away from the enclosed space, and a second side surface 232 connecting the third surface 230 and the fourth surface 231. The first housing 10 comprises two connecting parts 14, the two connecting parts 14 being located at each end of the first housing 10 along the third direction y, the connecting parts 14 forming the opening 13, and the connecting parts 14 being connected to the second side surface 232. The third surface 230 can be the inner surface of the third side wall 23, the fourth surface 231 can be the outer surface of the third side wall 23, and the second side surface 232 can be the outer circumferential surface of the third side wall 23, located between the inner surface and the outer surface. The outer circumferential surface of the third side wall 23 can be defined as the outer surface of the third side wall 23 in the first direction z and the second direction x. The connecting part 14 is a component located at the end of the first housing 10 in the third direction y, enclosing the opening 13 of the first housing 10, and the contour of the connecting part 14 is adapted to the second side surface 232 of the third side wall 23. The phrase “connecting part 14 is connected to the second side surface 232” can refer to the fact that in the third direction y the first housing 10 and the second housing 20 are connected to each other via the connecting part 14 and the second side surface 232. As can be seen from Fig. 7, the connecting part 14 can have the form of a plate that fits together with the second side surface 232. In some embodiments, the connection between the connecting part 14 and the second side surface 232 is a surface-to-surface connection. In the solution described above, the arrangement of the connecting part 14 for the connection with the second side surface 232 of the third side wall 23 can improve the connection stability between the first housing 10 and the second housing 20 and their sealing. According to some embodiments of this application, see Fig. 8, the second side surface 232 comprises a first flat surface 2320, a second flat surface 2321, and a transition surface 2322. The first flat surface 2320 is located at one end of the third side wall 23 that faces away from the second end wall 21. The two second flat surfaces 2321 are located at the two ends of the third side wall 23 along the second direction x. The transition surface 2322 connects the first flat surface 2320 and the second flat surface 2321 to provide a smooth transition between the first flat surface 2320 and the second flat surface 2321. The first flat surface 2320 can be the upper surface of the third side wall 23, which can also be a flat surface. The second flat surface 2321 can be the outer surface of the third side wall, which can also be a flat surface. In some embodiments, the first flat surface 2320 and the second flat surface 2321 are perpendicular to each other. The transition surface 2322 is the segment that connects the first flat surface 2320 and the second flat surface 2321, thus providing a smooth transition between them. A smooth transition can refer to the fact that the transition between the first flat surface 2320 and the second flat surface 2321 is not a right-angled transition. In some embodiments, the transition surface 2322 can be an arc surface or an inclined surface. In the solution described above, the first flat surface 2320 and the second flat surface 2321 are not coplanar. Therefore, the arrangement of a transition surface 2322 allows for a smooth transition between the first flat surface 2320 and the second flat surface 2321. This promotes the formation of an effective sealing surface between the connecting part 14 and the second side surface 232, thereby ensuring the tightness of the battery 100. According to some embodiments of this application, see Fig. 8, the second flat surface 2321 is flush with the first side surface 210. The second flat surface 2321 is flush with the first side surface 210. This can mean that the outer surface of the third side wall 23 in the second direction x is flush with the outer surface of the second end wall 21 in the second direction x, i.e., the surface of the second housing 20 in the second direction x is a flat surface. In the solution described above, the second flat surface 2321 is flush with the first side surface 210. This reduces the risk of gaps between the first side wall 12 and the second side surface 232, as well as the risk of gaps between the connecting part 14 and the second flat surface 2321, thus improving the sealing of the battery 100. According to some other embodiments of this application, with reference to Fig. 9 and Fig. 10, Fig. 9 is a partial schematic representation of the first housing 10 in some other embodiments of this application, and Fig. 10 is a partial schematic representation of the second housing 20 in some other embodiments of this application. The first housing 10 further comprises a fourth side wall 15, wherein the fourth side wall 15 adjoins the first side wall 12. One end of the fourth side wall 15 is connected to the first end wall 11, and at the other end of the fourth side wall 15 is a connecting part 14, wherein the connecting part 14 projects away from the fourth side wall 15 in the direction of the enclosed space. The first end wall 11 has a lower surface facing the second end wall 21, and the fourth side wall 15 is a component that projects from the lower surface and abuts the first side wall 12. The fourth side wall 15 may be welded or bonded to the first end wall 11. If the first housing 10 has two first side walls 12 that are opposite each other along the second direction x, the fourth side wall 15 is located between the two first side walls 12, with one end of the fourth side wall 15 connected to the first end wall 11 and the opposite ends of the fourth side wall 15 each being connected to the two first side walls 12 in the second direction x. The connecting part 14 can project from the interior of the enclosed space outwards onto the fourth side wall 15. The connecting part 14 can be formed integrally with the fourth side wall 15, or the connecting part 14 can be joined to the fourth side wall 15 by welding or bonding. In some embodiments, with reference to Fig. 10, the dimension of the third side wall 23 in the first direction z can be reduced by arranging the fourth side wall 15, i.e. the larger the dimension of the fourth side wall 15 in the first direction z, the smaller the dimension of the third side wall 23 in the first direction z can be. In the solution described above, the first casing 10 can be the upper casing and the second casing 20 the lower casing. In the manufacturing process of battery 100, the material costs and density of the upper casing can be lower than those of the lower casing. By adding the fourth side wall 15, which increases the proportion of the first casing 10 in battery 100, the manufacturing costs of battery 100 can be effectively reduced and the gravimetric energy density of battery 100 increased. In some embodiments, the fourth side wall 15 can have a larger dimension in the first direction z, and components such as explosion protection valves, water cooling connections or high and low voltage connectors can be mounted on the fourth side wall 15. According to some embodiments of this application, the battery 100 further comprises a second fastening element (not shown in the figure), and the connecting part 14 is connected to the second side surface 232 via the second fastening element. The second fastening element is a connecting part 14 that joins the two side surfaces and the connecting part 14. In some embodiments, the second fastening element may be a rivet, screw, bolt, or other connecting part. In some other embodiments, the second fastening element may also be an adhesive layer arranged between the connecting part 14 and the second side surface 232. In the solution described above, the arrangement of the second fastening element to connect the second side surface 232 with the connecting part 14 improves the connection stability between the connecting part 14 and the second side surface 232, thereby increasing the structural stability of the battery 100. According to some embodiments of this application, reference is made to Figs. 7 and 8. The connecting part 14 is provided with a second through-hole 140, the second side surface 232 is provided with a second threaded hole 2323, and the second fastening element passes through the second through-hole 140 and is connected to the second threaded hole 2323. The second through-hole 140 is a hole-like structure that penetrates the outer and inner surfaces of the connecting part 14. The phrase "The second side surface 232 is provided with a second threaded hole 2323" can refer to a hole-like structure with an internal thread on the second side surface 232, such as a self-tapping thread; or it can refer to a rivet nut or a press nut on the second side surface 232. With reference to Figures 7 and 8, there can be several second through-holes 140, the several second through-holes 140 being spaced apart; furthermore, there can be several second threaded holes 2323, the first threaded holes 2100 corresponding to the first through-holes 120. The wording “The second fastening element passes through the second through hole 140 and is connected to the second threaded hole 2323” can refer to the fact that the second fastening element has an external thread that fits with the second threaded hole 2323, so that it can be screwed into the second threaded hole 2323. In the solution described above, the second fastening element can be a connecting part 14 with an external thread, such as a screw or bolt, which can be effectively connected to the second threaded hole 2323, thereby improving the connection stability between the connecting part 14 and the second side surface 232 and ensuring a good seal between the connecting part 14 and the second side surface 232. According to some embodiments of this application, as shown in Fig. 3, the battery 100 further comprises a second seal 31, wherein the second seal 31 is arranged between the connecting part 14 and the second side surface 232. The second seal 31 can be a component with sealing properties and is arranged between the connecting part 14 and the second side surface 232. In some embodiments, the second seal 31 can be a sealing compound or a sealing washer, and the second seal 31 is clamped between the first flat surface 2320 and the connecting part 14, between the second flat surface 2321 and the connecting part 14, and between the transition surface 2322 and the connecting part 14. In the solution described above, by providing a second seal 31 between the connecting part 14 and the second side surface 232, the sealing between the wall of the connecting part 14 and the second side surface 232 can be improved, thus improving the sealing of the battery 100. According to some embodiments of this application, as shown in Fig. 3, the battery 100 further comprises a first seal 30, wherein the first seal 30 is arranged between the first side wall 12 and the first side surface 210. The two ends of the first seal 30 are each connected to the two second seals 31. In Fig. 3, the first seal 30 corresponds to the connecting part 14 between the first side surface 210 and the first side wall 12 and extends in the longitudinal direction of the battery 100. The second seal 31 corresponds to the connecting part 14 between the second side surface 232 and the connecting part 14 and comprises a section in the width direction of the battery 100, a section in the height direction of the battery 100, and a section corresponding to the transition surface 2322. In some embodiments, the first seal 30 and the second seal 31 can be independent components. The first seal 30 and the second seal 31 are joined together by adhesive bonding or via an intermediate connector. In other embodiments, the first seal 30 and the second seal 31 can form a single-piece structure. In the solution described above, the first seal 30 and the second seal 31 can be formed in one piece or joined separately. The arrangement of the first seal 30 and the second seal 31 ensures a good seal between the first housing 10 and the second housing 20, thus improving battery safety. According to some other embodiments of this application, with reference to Fig. 11, Fig. 11 is a schematic representation of the second housing 20 in some other embodiments of this application. The dimension of one of the third side walls 23 along the first direction z is smaller than the dimension of the other third side wall 23 along the first direction z. The dimension of the third side wall 23 in the first direction z can be considered the height of the third side wall 23. The statement "The dimension of one of the third side walls 23 along the first direction z is smaller than the dimension of the other third side wall 23 along the first direction z" can mean that one of the third side walls 23 is higher and the other third side wall 23 is lower. Since the heights of the two third side walls 23 are different, the resulting height difference can be compensated for by the first housing 10. In the solution described above, the larger third side wall 23 can be used to install components such as explosion protection valves, water cooling connections, or high- and low-voltage connectors to ensure normal charging and discharging of the battery 100. By reducing the dimensions of the other third side wall 23, the size of the first housing 10 corresponding to the third side wall 23 can be adjusted. This increases the proportion of the first housing 10 in the battery 100 (in this embodiment, the first housing 10 can be an upper housing with lower material costs and lower density). This reduces the manufacturing costs of the battery 100 and increases its gravimetric energy density. According to some embodiments of this application, as shown in Fig. 3 and Fig. 5, the second end wall 21 is provided with a mounting part 40 for attaching the battery 100 to an electrical device. The mounting part 40 is a component on the second end wall 21 for attaching the battery 100 to the electrical device. The mounting part 40 can be a nut, a connecting clamp, or another connecting structure on the second end wall 21. In some embodiments, several mounting parts 40 may be present, arranged along the third direction y and the second direction x. In some embodiments, the mounting part 40 may be a threaded hole M8, M10, M12, or M16 on the second end wall 21. In the solution described above, a mounting part 40 is provided on the second end wall 21 to ensure stable mounting of the battery 100 and to ensure that the battery 100 supplies power. According to some embodiments of this application, an electrical device is also provided, including the battery 100 described above, wherein the battery 100 serves to provide electrical energy. In some embodiments, the electrical device may be a vehicle, for example a truck or a bus. According to some embodiments of this application, this application also provides a battery 100, as shown in Figs. 3, 4, 5, 6, 7 to 8. The battery 100 comprises a first housing 10, a second housing 20, and battery cells. The first housing 10 is the upper housing of the battery 100, and the second housing 20 is the lower housing of the battery 100. The second housing 20 and the first housing 10 are connected to each other and form an enclosed space in which the battery cells are housed. The first housing 10 comprises a first end wall 11, two first side walls 12, and two connecting parts 14. The first end wall 11 can be the upper wall of the battery 100, and the two first side walls 12 are arranged opposite the first end wall 11 in the second direction x (the width direction of the battery 100).The two connecting parts 14 are located at the two ends of the first housing 10 in the third direction y (the longitudinal direction of the battery 100), and the connecting parts 14 form an opening 13. The second housing 20 comprises a second end wall 21 and two second side walls 22. The second end wall 21 can be the bottom wall of the battery 100. The second end wall 21 has two first surfaces 211 that face each other along the second direction x. The second end wall 21 can be provided with a cross member 24. There can be several cross members 24, which are spaced apart along the third direction y. The cross member 24 can improve the structural strength of the second housing 20, and the battery cells can also be connected to the cross member 24.Two second side walls 22 are arranged opposite each other along the third direction y (the longitudinal direction of the battery 100) at the second end wall 21. The second side wall 22 has a first flat surface 2320 facing the first end wall 11, two second flat surfaces 2321 opposite each other along the second direction x, and a transition surface 2322 connecting the first flat surface 2320 with the second flat surface 2321. The first end wall 11 and the second end wall 21 are aligned along the first direction z (the vertical direction of the battery 100). The inner surface of the first side wall 12 is connected to the first side surface 210. A first seal 30 is arranged between the first side wall 12 and the first side surface 210. The first side wall 12 and the second side surface 232 are connected by a first fastening element. The second side wall 22 corresponds to the connecting part 14. A second seal 31 is provided between the second side wall 22 and the connecting part 14. The first flat surface 2320, the second flat surface 2321, and the transition surface 2322 are all connected to the connecting part 14 by means of the second fastening element. A mounting part 40 for mounting the battery 100 on an electrical device (e.g. a truck or bus) is provided on the crossbeam 24. The above description merely presents preferred embodiments of this application and is not to be construed as limiting the application. Those skilled in the art may make various modifications and variations of this application. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the present application should be included within the scope of protection of the present application.

Claims

Battery comprising: a battery cell; a first housing, the first housing comprising a first end wall and a first side wall; a second housing, the second housing being connected to the first housing to form an enclosed space for receiving the battery cell, the second housing having a second end wall, the second end wall being opposite the first end wall in a first direction, the second end wall having a first side surface in a second direction, the first direction intersecting the second direction; one end of the first side wall being connected to the first end wall and the other end being connected to the first side surface. Battery according to claim 1, wherein the inner surface of the first side wall is connected to the first side surface. Battery according to claim 1 or 2, wherein the second end wall has a first surface facing the first end wall and, in the direction from the first end wall to the second end wall, an end of the first side wall facing away from the first end wall projects beyond the first surface. Battery according to one of claims 1 to 3, wherein the second end wall has a second surface facing away from the first end wall, and in the direction from the first end wall to the second end wall an end of the first side wall facing away from the first end wall does not project beyond the second surface. Battery according to any one of claims 1 to 4, wherein the material density of the first casing is lower than the material density of the second casing. Battery according to claim 5, wherein the first housing is made of plastic and the second housing is made of an aluminum alloy. Battery according to any one of claims 1 to 6, wherein the battery further comprises a first fastening element, wherein the first side wall is connected to the first side surface by the first fastening element. Battery according to claim 7, wherein the first side wall is provided with a first through-hole, the first side surface is provided with a first threaded hole, and the first fastening element passes through the first through-hole and is connected to the first threaded hole. Battery according to any one of claims 1 to 8, wherein the battery further comprises a first seal, wherein the first seal is arranged between the first side wall and the first side surface. Battery according to any one of claims 1 to 9, wherein there are two first side walls, the two first side walls being opposite each other along the second direction; the second end wall is located between the two first side walls, the second end wall having two first side surfaces that are opposite each other along the second direction; the first side surfaces and the first side walls correspond one to one. Battery according to one of claims 1 to 10, wherein the second housing further comprises two second side walls, wherein the two second side walls are opposite each other in the second direction and are connected to the second end wall, wherein the battery cell is arranged between the two second side walls. Battery according to any one of claims 1 to 11, wherein the first housing has openings at both ends along a third direction; the second housing further comprises two third side walls, wherein the two third side walls are opposite each other along the third direction and are connected to the second end wall, wherein the two third side walls each close the two openings; the first direction, the second direction and the third direction intersect in pairs. Battery according to claim 12, wherein the third side wall comprises a third surface facing the enclosed space, a fourth surface facing away from the enclosed space, and a second side surface connecting the third surface and the fourth surface; the first housing comprises two connecting parts, wherein the two connecting parts are located at both ends of the first housing along the third direction, the connecting parts forming the opening, and wherein the connecting parts are connected to the second side surface. Battery according to claim 13, wherein the second side surface comprises a first flat surface, a second flat surface, and a transition surface. The first flat surface is located at an end of the third side wall facing away from the second end wall. The two second flat surfaces are located at the two ends of the third side wall along the second direction. The transition surface connects the first flat surface and the second flat surface to provide a smooth transition between the first flat surface and the second flat surface. Battery according to claim 14, wherein the second flat surface is flush with the first side surface. Battery according to one of claims 13 to 15, wherein the first housing further comprises a fourth side wall, wherein the fourth side wall adjoins the first side wall; one end of the fourth side wall is connected to the first end wall, and at the other end of the fourth side wall there is a connecting part, wherein the connecting part projects away from the fourth side wall in the direction of the enclosed space. Battery according to one of claims 13 to 16, wherein the battery further comprises a second fastening element, and wherein the connecting part is connected to the second side surface via the second fastening element. Battery according to claim 17, wherein the connecting part is provided with a second through-hole, the second side surface is provided with a second threaded hole, and the second fastening element passes through the second through-hole and is connected to the second threaded hole. Battery according to one of claims 13 to 18, wherein the battery further comprises a second seal, the second seal being arranged between the connecting part and the second side surface. Battery according to claim 19, wherein the battery further comprises a first seal, wherein the first seal is arranged between the first side wall and the first side surface; wherein the two ends of the first seal are each connected to two second seals. Battery according to any one of claims 12 to 20, wherein the dimension of one of the third side walls along the first direction is smaller than the dimension of the other third side wall along the first direction. Battery according to any one of claims 1 to 21, wherein the second end wall is provided with a mounting part for attaching the battery to an electrical device. Electrical device comprising a battery according to any one of claims 1 to 22, wherein the battery serves to provide electrical energy.

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