Battery and power consuming device

Abstract

The application discloses a battery and a power utilization device. The battery comprises a battery cell, a first box body comprising a first end wall and a first side wall, and a second box body. The second box body and the first box body are connected to each other to jointly form an enclosed space for accommodating the battery cell. The second box body comprises a second end wall, which is arranged opposite to the first end wall along a first direction. The second end wall has a first side surface in a second direction, and the first direction intersects the second direction. One end of the first side wall is connected to the first end wall, and the other end is connected to the first side surface. The technical scheme provided by the application can improve the energy density of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] In the development of battery technology, how to improve the energy density of batteries is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present application provides a battery and an electrical device, which can improve the energy density of the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a battery comprising: a battery cell; a first box body, the first box body comprising a first end wall and a first side wall; a second box body, the second box body and the first box body being interconnected to jointly form a closed space for accommodating the battery cell, the second box body comprising a second end wall, the second end wall being arranged opposite to the first end wall along a first direction, the second end wall having a first side surface in a second direction, the first direction intersecting with the second direction; wherein one end of the first side wall is connected to the first end wall, and the other end is connected to the first side surface.

[0007] In the above scheme, the connection between the first box and the second box is achieved by connecting one end of the first side wall of the first box to the first side surface of the second end wall. This allows the connection between the first box and the second box to be achieved without providing a flange structure protruding along the second direction, thereby improving the space utilization of the battery in the second direction to accommodate more battery cells or reduce the volume of the battery, thereby increasing the volume energy density of the battery.

[0008] According to some embodiments of the present application, the inner surface of the first side wall is connected to the first side surface.

[0009] In the above solution, by connecting the inner surface of the first side wall, ie the surface facing the first side surface, to the first side surface, the size of the battery in the second direction can be effectively reduced, so as to maximize the volume energy density of the battery.

[0010] According to some embodiments of the present application, the second end wall has a first surface facing the first end wall, and an end of the first side wall away from the first end wall extends beyond the first surface in a direction from the first end wall to the second end wall.

[0011] In the above scheme, the end of the first side wall away from the first end plate protrudes beyond the first surface, so that the first side wall can be directly connected to the first side surface. On the one hand, it can effectively reduce the assembly difficulty and manufacturing cost caused by the indirect connection of the first side wall to the first side surface through the intermediate connecting member. On the other hand, the inner surface of the part of the first end wall protruding from the first surface can be connected to the first side surface, which can effectively reduce the size of the battery in the second direction, so as to maximize the volume energy density of the battery.

[0012] According to some embodiments of the present application, the second end wall has a second surface facing away from the first end wall, and along the direction from the first end wall to the second end wall, the end of the first side wall away from the first end wall does not exceed the second surface.

[0013] In the above solution, the end of the first side wall away from the first end wall does not extend beyond the second surface, so that the size of the battery in the first direction is controlled, ensuring that the battery has a high volume energy density.

[0014] According to some embodiments of the present application, the material density of the first box body is less than the material density of the second box body.

[0015] In the above solution, since the first side wall is connected to the first side surface, the proportion of the first box body to the battery is increased, and the material density of the first box body is smaller than that of the second box body, the density of the battery is reduced. Under the same volume, the weight of the battery is reduced, thereby improving the weight energy density of the battery.

[0016] According to some embodiments of the present application, the material of the first box body is plastic, and the material of the second box body is aluminum alloy.

[0017] In the above solution, the first housing can be the upper housing of the battery, and the second housing can be the lower housing of the battery. The second housing is made of aluminum alloy, which gives it high structural strength and rigidity, providing high protection for the battery cells. The first housing, serving as the upper housing, seals the battery cells between the upper and lower housings. Its plastic construction can effectively reduce the manufacturing cost of the battery and can effectively reduce the battery's weight, thereby increasing its gravimetric energy density.

[0018] According to some embodiments of the present application, the battery further includes a first fastener, and the first side wall is connected to the first side surface via the first fastener.

[0019] In the above solution, the first fastener is provided to connect the first side wall and the first side surface so that the connection stability between the first side wall and the first side surface is higher, thereby improving the structural stability of the battery.

[0020] According to some embodiments of the present 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 fastener passes through the first through hole and is connected to the first threaded hole.

[0021] In the above scheme, the first fastener can be a connecting component with external threads such as a bolt or a screw, 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 good sealing between the first side wall and the first side surface.

[0022] According to some embodiments of the present application, the battery further includes a first seal, which is disposed between the first side wall and the first side surface.

[0023] In the above solution, by arranging the first sealing member between the first side wall and the first side surface, the sealing between the first side wall and the first side surface can be improved, thereby improving the sealing of the battery.

[0024] According to some embodiments of the present application, there are two first side walls, and the two first side walls are arranged opposite to each other along the second direction; the second end wall is located between the two first side walls, and the second end wall has two first side faces arranged opposite to each other along the second direction; the first side faces and the first side walls correspond one to one.

[0025] In the above solution, there are two first side walls which are arranged opposite to each other along the second direction and are respectively connected to the corresponding first side faces, which can effectively improve the space utilization of the battery in the second direction and thereby improve the volume energy density of the battery.

[0026] According to some embodiments of the present application, the second box body further includes two second side walls, the two second side walls are arranged opposite to each other along the second direction and connected to the second end wall, and the battery cell is arranged between the two second side walls.

[0027] In the above scheme, two opposite second side walls are arranged on the second end wall along the second direction. On the one hand, the structural strength of the second box body can be improved. On the other hand, the installation area of ​​the battery cell can be limited so that the battery cell can be stably assembled in the second box body. On the other hand, since the second side wall protrudes from the surface of the second end wall, when the battery cell is bonded to the second box body by glue, the glue overflow space can be effectively controlled, thereby reducing the risk of waste and environmental pollution caused by glue overflow.

[0028] According to some embodiments of the present application, openings are respectively formed at both ends of the first box body along the third direction; the second box body also includes two third side walls, the two third side walls are oppositely arranged along the third direction and connected to the second end wall, and the two third side walls respectively close the two openings; the first direction, the second direction and the third direction intersect with each other.

[0029] In the above scheme, by providing the third side wall, on the one hand, components such as explosion-proof valves, water-cooling connectors or high and low voltage connectors can be installed on the third side wall to ensure normal charging and discharging of the battery; on the other hand, compared with the flange structure protruding along the third direction between the first box body and the second box body, by providing the third side wall to close the opening, the space utilization of the battery in the third direction can be improved, and the volume energy density of the battery can be improved.

[0030] According to some embodiments of the present application, the third side wall includes a third surface facing the enclosed space, a fourth surface away from the enclosed space, and a second side surface connecting the third surface and the fourth surface; the first box body includes two connecting parts, the two connecting parts are respectively located at the two ends of the first box body along the third direction, the connecting parts surround the opening, and the connecting parts are connected to the second side surface.

[0031] In the above solution, by providing a connecting portion to connect with the second side surface of the third side wall, the connection stability and sealing performance between the first box body and the second box body can be ensured.

[0032] According to some embodiments of the present application, the second side surface includes a first flat surface, a second flat surface and a transition surface, the first flat surface is arranged at an end of the third side wall facing away from the second end wall, two second flat surfaces are respectively arranged at both ends of the third side wall along the second direction, and the transition surface connects the first flat surface and the second flat surface to make the first flat surface and the second flat surface transition smoothly.

[0033] In the above solution, the first flat surface and the second flat surface are non-coplanar surfaces. Therefore, a transition surface is provided to ensure a smooth transition between the first flat surface and the second flat surface, which is conducive to forming a good sealing surface between the connecting portion and the second side surface, so that the battery has higher sealing performance.

[0034] According to some embodiments of the present application, the second flat surface is flush with the first side surface.

[0035] In the above solution, the second flat surface is flush with the first side surface, which can reduce the risk of a gap between the first side wall and the second side surface, and reduce the risk of a gap between the connecting portion and the second flat surface, thereby improving the sealing of the battery.

[0036] According to some embodiments of the present application, the first box body also includes a fourth side wall, which is adjacent to the first side wall; one end of the fourth side wall is connected to the first end wall, and the connecting portion is arranged at the other end of the fourth side wall, and the connecting portion protrudes from the fourth side wall in a direction away from the enclosed space.

[0037] In the above scheme, the first box body can be an upper box body, and the second box body can be a lower box body. In the manufacturing process of the battery, the material cost and density of the upper box body can be lower than those of the lower box body. For this reason, the fourth side wall is set to increase the proportion of the first box body in the battery, thereby effectively reducing the manufacturing cost of the battery and improving the weight energy density of the battery.

[0038] According to some embodiments of the present application, the battery further includes a second fastener, and the connecting portion is connected to the second side surface via the second fastener.

[0039] In the above solution, a second fastener is provided to connect the second side surface and the connecting portion to improve the connection stability between the connecting portion and the second side surface, thereby improving the structural stability of the battery.

[0040] According to some embodiments of the present application, the connecting portion is provided with a second through hole, the second side surface is provided with a second threaded hole, and the second fastener passes through the second through hole and is connected to the second threaded hole.

[0041] In the above solution, the second fastener can be a connecting component with external threads such as a bolt or a screw, 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 good sealing between the connecting part and the second side surface.

[0042] According to some embodiments of the present application, the battery further includes a second sealant disposed between the connecting portion and the second side surface.

[0043] In the above solution, by providing the second sealing member between the connecting portion and the second side surface, the sealing between the connecting portion wall and the second side surface can be improved, thereby improving the sealing of the battery.

[0044] According to some embodiments of the present application, the battery further includes a first seal, which is disposed between the first side wall and the first side surface; wherein both ends of the first seal are respectively connected to two second seals.

[0045] In the above solution, the first sealing member and the second sealing member can be integrally formed or separately connected. By providing the first sealing member and the second sealing member, good sealing can be achieved between the first box body and the second box body, thereby improving the safety of the battery.

[0046] According to some embodiments of the present application, a dimension of one of the third side walls along the first direction is smaller than a dimension of another of the third side walls along the first direction.

[0047] In the above scheme, the third side wall with a larger size can be installed with components such as explosion-proof valves, water-cooled connectors or high and low voltage connectors to ensure the normal charging and discharging of the battery; by reducing the size of the other third side wall, the size of the first box corresponding to the third side wall can be adaptively increased, thereby increasing the proportion of the first box to the battery (in this embodiment, the first box can be an upper box with lower material cost and density), thereby reducing the manufacturing cost of the battery and increasing the weight energy density of the battery.

[0048] According to some embodiments of the present application, the second end wall is provided with a mounting portion for mounting the battery on an electrical device.

[0049] In the above solution, a mounting portion is provided on the second end wall to achieve stable assembly of the battery and ensure that the battery provides electrical energy.

[0050] In a second aspect, the present application further provides an electrical device comprising the battery described in any one of the first aspects, wherein the battery is used to provide electrical energy.

[0051] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of a vehicle according to some embodiments of the present application;

[0054] Figure 2 Schematic diagram of a battery in some embodiments of the present application;

[0055] Figure 3 This is a three-dimensional exploded view of a battery in some embodiments of the present application;

[0056] Figure 4 This is a schematic diagram of the first box in some embodiments of the present application;

[0057] Figure 5 This is a schematic diagram of the second box in some embodiments of the present application;

[0058] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0059] Figure 7 This is a partial schematic diagram of the first box in some embodiments of the present application;

[0060] Figure 8 This is a schematic diagram of a third side wall in some embodiments of the present application;

[0061] Figure 9 This is a partial schematic diagram of the first box in some other embodiments of the present application;

[0062] Figure 10 This is a partial schematic diagram of the second box in some other embodiments of the present application;

[0063] Figure 11 This is a schematic diagram of the second box in some other embodiments of the present application.

[0064] Icons: 100-battery; 1000-vehicle; 200-controller; 300-motor; 10-first box; 11-first end wall; 12-first side wall; 120-first through hole; 13-opening; 14-connecting portion; 140-second through hole; 15-fourth side wall; 20-second box; 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-crossbeam; 30-first seal; 31-second seal; 40-mounting portion; z-first direction; x-second direction; y-third direction. DETAILED DESCRIPTION

[0065] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0068] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0070] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0071] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "up", and "down" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include one or more battery cells. The battery also includes a first housing and a second housing, which are connected to form an enclosed space. The battery cells are arranged in the enclosed space to prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] In the development of battery technology, improving battery energy density is a pressing technical issue. The inventors discovered that currently, the edges of both the first and second battery housings are provided with flange structures that protrude outward from the battery. The flange structures connect the first and second housings to achieve a sealed connection. However, the protruding flange structures occupy additional space, resulting in low battery space utilization and a reduction in the battery's volumetric energy density.

[0075] In view of this, to address the problem of low battery space utilization and reduced battery energy density caused by the extra space occupied by the protruding flange structure, the inventors, after in-depth research, designed a battery comprising a first housing and a second housing, wherein the first housing comprises a first end wall and a first side wall. The second housing comprises a second end wall, the first end wall and the second end wall being arranged opposite each other along a first direction, the second end wall having a first side surface in a second direction, the first direction intersecting the second direction. The first side surface of the first housing is connected to the first side surface of the second end wall.

[0076] In the above solution, the battery eliminates the flange structure protruding outward, so that the first side wall is connected to the first side surface, saving the space wasted due to the flange structure, and improving the space utilization of the battery in the second direction to accommodate more battery cells or reduce the volume of the battery, thereby increasing the volume energy density of the battery.

[0077] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, a battery cabinet, a container-type energy storage device, etc. The energy storage device can include multiple batteries disclosed in the present application.

[0078] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical equipment.

[0079] The embodiments of the present application provide an electrical device using a battery as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a heavy truck, a bus, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0080] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0081] Please refer to Figure 1 , Figure 1 Schematic diagram of a vehicle according to some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle, etc. The type of vehicle 1000 may be a sedan, an off-road vehicle, a heavy truck or a bus, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0082] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0083] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] According to some embodiments of the present application, the present application provides a battery 100, see Figure 2-Figure 6 , Figure 2 This is a schematic diagram of a battery in some embodiments of the present application. Figure 3 This is a three-dimensional exploded view of the battery 100 in some embodiments of the present application. Figure 4 This is a schematic diagram of the first box 10 in some embodiments of the present application. Figure 5 This is a schematic diagram of the second box 20 in some embodiments of the present application. Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0085] The battery 100 includes a battery cell (not shown), a first housing 10, and a second housing 20. The first housing 10 includes a first end wall 11 and a first side wall 12. The second housing 20 and the first housing 10 are interconnected to form an enclosed space for accommodating the battery cell. The second housing 20 includes a second end wall 21, which is arranged opposite the first end wall 11 along a first direction z. The second end wall 21 has a first side surface 210 in a second direction x, where the first direction z intersects the second direction x. The first side wall 12 has one end connected to the first end wall 11 and the other end connected to the first side surface 210.

[0086] In some embodiments, the first box body 10 can be regarded as the upper box body of the battery 100, the first end wall 11 can be regarded as the top wall of the battery 100, and the first side wall 12 can be a portion connected to the first end wall 11 at one end and not in the same plane as the first end wall 11; the first side wall 12 can be connected to the first end wall 11 by welding or bonding.

[0087] The second housing 20 can be considered the lower housing of the battery 100, and the second end wall 21 can be considered the bottom wall of the battery 100. The first direction z can be the height direction of the battery 100, that is, the top wall and the bottom wall are arranged opposite each other along the height direction of the battery 100. The first side surface 210 can be the surface of the bottom wall in the second direction x. The first housing 10 and the second housing 20 are connected to each other to form an enclosed space capable of accommodating battery cells.

[0088] The first direction z intersects the second direction x, which may mean that the first direction z and the second direction x are not parallel. Correspondingly, the first side surface 210 may be understood as the surface of the second end wall 21 that does not face or deviate from the first end wall 11 .

[0089] “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” may mean that the first side wall 12 connects the first end wall 11 and the second end wall 21 to each other, and the end of the first side wall 12 away from the first end wall 11 is directly or indirectly connected to the first side surface 210. It can be understood that the connection surface between the first side wall 12 and the first end wall 11 is located on the first side surface 210 and does not protrude from the outer contours of the first box body 10 and the second box body 20 in the second direction x. “The end of the first side wall 12 away from the first end wall 11 is directly or indirectly connected to the first side surface 210” may mean that the first side wall 12 is directly connected to the first side surface 210, or the first side wall 12 is indirectly connected to the first side surface 210 through an intermediate connecting member.

[0090] In the above scheme, the connection between the first box body 10 and the second box body 20 is achieved by connecting one end of the first side wall 12 of the first box body 10 to the first side surface 210 of the second end wall 21. The connection between the first box body 10 and the second box body 20 can be achieved without setting a flange structure protruding along the second direction x, thereby improving the space utilization of the battery 100 in the second direction x to accommodate more battery cells or reduce the volume of the battery, thereby improving the volume energy density of the battery 100.

[0091] According to some embodiments of the present application, the inner surface of the first sidewall 12 is connected to the first side surface 210 .

[0092] The inner surface of the first sidewall 12 may refer to the surface of the first sidewall 12 facing the interior of the battery 100. “The inner surface of the first sidewall 12 is connected to the first side surface 210” may refer to a surface-to-surface connection between the inner surface of the first sidewall 12 and the first side surface 210.

[0093] In the above solution, by connecting the inner surface of the first side wall 12, i.e., the surface facing the first side surface 210, to the first side surface 210, the size of the battery 100 in the second direction x can be effectively reduced to maximize the volume energy density of the battery 100.

[0094] According to some embodiments of the present application, Figure 5 and Figure 6 The second end wall 21 has a first surface 211 facing the first end wall 11 , and an end of the first side wall 12 away from the first end wall 11 extends beyond the first surface 211 along the direction from the first end wall 11 to the second end wall 21 .

[0095] Second end wall 21 has a first surface 211 in a first direction z. First surface 211 is the surface of second end wall 21 facing first end wall 11. First surface 211 can be considered the upper surface of second end wall 21. In some embodiments, battery cells are located between first surface 211 and first end wall 11.

[0096] “In the direction from the first end wall 11 to the second end wall 21, the end of the first side wall 12 away from the first end wall 11 extends beyond the first surface 211” may mean that the orthographic projection of the first side wall 12 on the plane where the first side surface 210 is located overlaps with the first side surface 210, and the overlapping portion of the first side wall 12 and the first side surface 210 may be the portion where the first side wall 12 and the first side surface 210 are connected to each other.

[0097] In the above scheme, the end of the first side wall 12 away from the first end plate protrudes beyond the first surface 211, so that the first side wall 12 can be directly connected to the first side surface 210. On the one hand, it can effectively reduce the assembly difficulty and manufacturing cost caused by the indirect connection of the first side wall 12 to the first side surface 210 through the intermediate connecting member. On the other hand, the inner surface of the portion of the first end wall 11 that protrudes beyond the first surface 211 can be connected to the first side surface 210, which can effectively reduce the size of the battery 100 in the second direction x, so as to maximize the volume energy density of the battery 100.

[0098] According to some embodiments of the present application, Figure 5 and Figure 6 The second end wall 21 has a second surface 212 facing away from the first end wall 11 , and along the direction from the first end wall 11 to the second end wall 21 , the end of the first side wall 12 away from the first end wall 11 does not exceed the second surface 212 .

[0099] The second end wall 21 has a second surface 212 in the first direction z. The second surface 212 is a surface of the second end wall 21 that faces away from the first end wall 11 . The second surface 212 can be regarded as the lower surface of the second end wall 21 .

[0100] “In the direction from the first end wall 11 to the second end wall 21 , the end of the first side wall 12 away from the first end wall 11 does not exceed the second surface 212 ” may mean that the end of the first side wall 12 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 .

[0101] In the above solution, the end of the first side wall 12 away from the first end wall 11 does not exceed the second surface 212, so that the size of the battery 100 in the first direction z is controlled, ensuring that the battery 100 has a higher volume energy density.

[0102] In some embodiments, as Figure 3, the second direction x is the width direction of the battery 100. The battery 100 may be a square battery 100, and the battery 100 may have a height direction, a width direction, and a length direction. The height direction of the battery 100 may be the first direction z, that is, the direction in which the first end wall 11 and the second end wall 21 are relative. The width direction and the length direction of the battery 100 may be perpendicular to each other and both perpendicular to the height direction. The dimension of the battery 100 in the length direction is generally greater than the dimension in the width direction. In some embodiments, the side surface of the battery 100 in the width direction is the surface of the battery 100 with a larger area, that is, the large surface. The first box body 10 can be the upper box body of the battery 100. In the manufacturing process of the battery 100, the material cost and density of the upper box body can be lower than those of the lower box body. Therefore, when the second direction x is the width direction of the battery 100, the first side wall 12 can be regarded as the large surface (the surface with a larger area) of the battery 100, which can greatly save the material cost of the battery 100 to reduce the manufacturing cost of the battery 100, and can greatly reduce the weight of the battery 100 to improve the weight energy density of the battery 100.

[0103] According to some embodiments of the present application, the material density of the first box body 10 is less than the material density of the second box body 20 .

[0104] The density of a material is the mass per unit volume of a material in a specific volume state.

[0105] In the above solution, since the first side wall 12 is connected to the first side surface 210, the proportion of the first box body 10 to the battery 100 is increased, and the material density of the first box body 10 is smaller than that of the second box body 20, the density of the battery 100 is reduced. Under the same volume, the weight of the battery 100 is reduced, thereby improving the weight energy density of the battery.

[0106] In some other embodiments, the material density of the first box body 10 may also be equal to or greater than the material density of the second box body 20 .

[0107] According to some embodiments of the present application, the first box body 10 is made of plastic, and the second box body 20 is made of aluminum alloy.

[0108] The cost of plastic is lower than that of aluminum alloy, and its density is lower than that of aluminum alloy. Aluminum alloy has higher structural strength and rigidity than plastic.

[0109] In the above scheme, the first box body 10 can be the upper box body of the battery 100, and the second box body 20 can be the lower box body of the battery 100. The second box body 20 is made of aluminum alloy material, so that the second box body 20 has increased structural strength and rigidity, and plays a strong protective role for the battery cell. The first box body 10 serves as the upper box body to seal the battery cell and the upper and lower boxes. It is made of plastic, which can effectively reduce the manufacturing cost of the battery 100 and can effectively reduce the weight of the battery 100 to improve the weight energy density of the battery 100.

[0110] In some other embodiments, the first box body 10 may also be made of aluminum, aluminum alloy, steel, stainless steel, etc. In some other embodiments, the second box body 20 may also be made of plastic, aluminum, steel, stainless steel, etc.

[0111] According to some embodiments of the present application, the battery 100 further includes a first fastener (not shown in the figures), and the first side wall 12 is connected to the first side surface 210 via the first fastener.

[0112] The first fastener is a connecting portion 14 connecting the first side wall 12 and the first side surface 210. In some embodiments, the first fastener may be a connecting member such as a rivet, a screw, or a bolt. In other embodiments, the first fastener may also be an adhesive layer arranged between the first side wall 12 and the first side surface 210.

[0113] In the above solution, the first fastener is provided to connect the first side wall 12 and the first side surface 210 to ensure the connection stability between the first side wall 12 and the first side surface 210 , thereby ensuring the structural stability of the battery 100 .

[0114] According to some embodiments of this application, please combine Figure 6 and Figure 7 , Figure 7 Schematic diagram of a portion of the first housing 10 in some embodiments of the present application. The first side wall 12 is provided with a first through hole 120, and the first side surface 210 is provided with a first threaded hole 2100. The first fastener passes through the first through hole 120 and is connected to the first threaded hole 2100.

[0115] The first through hole 120 may refer to a hole-like structure that passes through the outer surface and the inner surface of the first side wall 12. The phrase "the first side surface 210 is provided with a first threaded hole 2100" may refer to a hole-like structure with an internal thread formed on the first side surface 210, such as a self-tapping thread; or may refer to a threaded hole for a rivet nut or a threaded hole for a pressure rivet nut provided on the first side surface 210. Figure 6 and Figure 7The number of the first through holes 120 can be multiple, and the multiple first through holes 120 are arranged at intervals 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 the second direction x); the number of the first threaded holes 2100 is also multiple, and the first threaded holes 2100 are arranged corresponding to the first through holes 120.

[0116] “The first fastener passes through the first through hole 120 and is connected to the first threaded hole 2100 ” may mean that the first fastener has an external thread that matches the first threaded hole 2100 so as to be threadedly connected to the first threaded hole 2100 .

[0117] In the above scheme, the first fastener can be a connecting part 14 with an external thread such as a bolt or a screw, which can be effectively connected to the first threaded hole 2100, so that the connection between the first side wall 12 and the first side surface 210 has a higher stability and the first side wall 12 and the first side surface 210 have good sealing.

[0118] According to some embodiments of the present application, Figure 3 The battery 100 further includes a first seal 30 , which is disposed between the first side wall 12 and the first side surface 210 .

[0119] The first seal 30 may be a component having sealing properties and disposed between the first sidewall 12 and the first side surface 210 . In some embodiments, the first seal 30 may be a sealant or a gasket, and the first seal 30 may be clamped between the first sidewall 12 and the first side surface 210 .

[0120] In the above solution, by disposing the first sealing member 30 between 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, thereby improving the sealing of the battery 100 .

[0121] According to some embodiments of the present application, Figure 3 、 Figure 4 and Figure 7 There are two first side walls 12, and the two first side walls 12 are arranged 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 arranged opposite each other along the second direction x. The first side surfaces 210 correspond one-to-one to the first side walls 12.

[0122] In some embodiments, there are two first side walls 12, which are arranged opposite each other along the second direction x to correspond to the two first side surfaces 210 of the second end wall 21 that are arranged opposite each other in the second direction x. The second end wall 21 is located between the two first side walls 12, and it can be understood that the outer contour of the battery 100 in the second direction x is defined by the two first side walls 12.

[0123] In the above solution, there are two first side walls 12 which are arranged opposite to each other along the second direction x and are respectively connected to the corresponding first side surfaces 210 , which can effectively improve the space utilization of the battery 100 in the second direction x, thereby improving the volume energy density of the battery 100 .

[0124] In some other embodiments, the number of the first side wall 12 may be one, and the one first side wall 12 can save space on one side of the battery 100 in the second direction x.

[0125] According to some embodiments of the present application, Figure 6 The second box body 20 further includes two second side walls 22 . The two second side walls 22 are arranged opposite to each other along the second direction x and connected to the second end wall 21 . The battery cell is arranged between the two second side walls 22 .

[0126] The second sidewall 22 is a component mounted on the second end wall 21. The second sidewall 22 can be mounted on 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. The second sidewall 22 protrudes from the first surface 211 in the direction from the second end wall 21 to the first end wall 11.

[0127] In some embodiments, the outer surface of the second sidewall 22 may be flush with the first side surface 210 .

[0128] In the above scheme, two opposite second side walls 22 are arranged on the second end wall 21 along the second direction x. On the one hand, the structural strength of the second box body 20 can be improved. On the other hand, the installation area of ​​the battery monomer can be limited so that the battery monomer can be assembled in the second box body 20 in an orderly manner. On the other hand, since the second side wall 22 protrudes from the surface of the second end wall 21, when the battery monomer is bonded to the second box body 20 by glue, the glue overflow space can be effectively controlled, thereby reducing the risk of waste and environmental pollution caused by glue overflow.

[0129] According to some embodiments of this application, see Figure 4 and Figure 7 The first box body 10 is formed with openings 13 at both ends along the third direction y. Figure 5 The second housing 20 further includes two third side walls 23, which are arranged opposite to each other along the third direction y and connected to the second end wall 21. The two third side walls 23 respectively close the two openings 13. The first direction z, the second direction x, and the third direction y intersect each other.

[0130] When the first direction z is the height direction of the battery 100 and the second direction x is the width direction of the battery 100 , the third direction y may be the length direction of the battery 100 .

[0131] The third side wall 23 is a component provided 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. The third side wall 23 protrudes from the first surface 211 in the direction from the second end wall 21 to the first end wall 11. The third side wall 23 provides structural strength to the first housing 10. In some embodiments, the third side wall 23 can be mounted with components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors to ensure normal charging and discharging of the battery 100.

[0132] The openings 13 formed at both ends of the first housing 10 along the third direction y can be notches corresponding to the third sidewalls 23. The third sidewalls 23 can correspondingly close the openings 13, preventing the batteries 100 from interfering with or overlapping with each other, thereby improving the utilization rate of the manufacturing materials of the batteries 100 and ensuring a lower manufacturing cost for the batteries 100. Furthermore, the openings 13 can be formed to prevent the batteries 100 from interfering with or overlapping with each other, thereby preventing the batteries 100 from wasting space. In some embodiments, the cross-section of the first housing 10 can be U-shaped.

[0133] In the above scheme, by providing the third side wall 23, on the one hand, components such as explosion-proof valves, water-cooling connectors or high and low voltage connectors can be installed on the third side wall 23 to ensure normal charging and discharging of the battery 100; on the other hand, relative to the flange structure protruding along the third direction y provided between the first box body 10 and the second box body 20, by providing the third side wall 23 to close the opening 13, the space utilization of the battery 100 in the third direction y can be improved, thereby improving the volume energy density of the battery 100.

[0134] According to some embodiments of this application, see Figure 7 and Figure 8 , Figure 8 Schematic diagram of the third sidewall 23 in some embodiments of the present application. The third sidewall 23 includes 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 includes two connecting portions 14, located at opposite ends of the first housing 10 along the third direction y. The connecting portions 14 enclose an opening 13 and are connected to the second side surface 232.

[0135] The third surface 230 may be the inner surface of the third sidewall 23, the fourth surface 231 may be the outer surface of the third sidewall 23, and the second side surface 232 may be the outer peripheral surface of the third sidewall 23 located between the inner and outer surfaces. The outer peripheral surface of the third sidewall 23 may refer to the outer surface of the third sidewall 23 in the first direction z and the second direction x.

[0136] The connecting portion 14 is a component located at the end of the first box body 10 in the third direction y. It surrounds the opening 13 of the first box body 10 and the contour of the connecting portion 14 matches the second side surface 232 of the third side wall 23 .

[0137] “The connecting portion 14 is connected to the second side surface 232 ” may mean that in the third direction y, the first box body 10 and the second box body 20 are connected to each other through the connecting portion 14 and the second side surface 232 .

[0138] See also Figure 7 The connecting portion 14 may be in a sheet shape and cooperate with the second side surface 232. In some embodiments, the connection relationship between the connecting portion 14 and the second side surface 232 is a surface-to-surface connection.

[0139] In the above solution, by providing the connecting portion 14 to connect to the second side surface 232 of the third side wall 23 , the connection stability and sealing between the first box body 10 and the second box body 20 can be improved.

[0140] According to some embodiments of this application, see Figure 8 The second side surface 232 includes a first flat surface 2320, a second flat surface 2321, and a transition surface 2322. The first flat surface 2320 is provided at the end of the third side wall 23 away from the second end wall 21. The two second flat surfaces 2321 are respectively provided 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 ensure a smooth transition between the first flat surface 2320 and the second flat surface 2321.

[0141] The first flat surface 2320 may be the upper surface of the third sidewall 23 and may be a flat surface. The second flat surface 2321 may be the outer surface of the third side surface and may 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 portion connecting the first flat surface 2320 and the second flat surface 2321, which enables a smooth transition between the first flat surface 2320 and the second flat surface 2321. A smooth transition may mean that the first flat surface 2320 and the second flat surface 2321 are not at a right angle.

[0142] In some embodiments, the transition surface 2322 may be a curved surface or an inclined surface.

[0143] In the above solution, the first flat surface 2320 and the second flat surface 2321 are non-coplanar surfaces. Therefore, a transition surface 2322 is provided to ensure a smooth transition between the first flat surface 2320 and the second flat surface 2321, thereby facilitating the formation of a good sealing surface between the connecting portion 14 and the second side surface 232, thereby ensuring the sealing of the battery 100.

[0144] According to some embodiments of the present application, see Figure 8 The second flat surface 2321 is flush with the first side surface 210 .

[0145] The second flat surface 2321 is flush with the first side surface 210 , which may mean that the outer side surface of the third side wall 23 in the second direction x is flush with the outer side surface of the second end wall 21 in the second direction x, that is, the surface of the second box body 20 in the second direction x is a flat surface.

[0146] In the above solution, the second flat surface 2321 is flush with the first side surface 210 , which can reduce the risk of a gap between the first side wall 12 and the second side surface 232 , and reduce the risk of a gap between the connecting portion 14 and the second flat surface 2321 , thereby improving the sealing of the battery 100 .

[0147] According to other embodiments of the present application, see Figure 9 and Figure 10 , Figure 9 This is a partial schematic diagram of the first box 10 in some other embodiments of the present application. Figure 10 Schematic diagram of a portion of the second housing 20 in some other embodiments of the present application. The first housing 10 further includes a fourth sidewall 15, which is adjacent to the first sidewall 12. One end of the fourth sidewall 15 is connected to the first end wall 11, and a connecting portion 14 is provided at the other end of the fourth sidewall 15, protruding from the fourth sidewall 15 in a direction away from the enclosed space.

[0148] The first end wall 11 has a lower surface facing the second end wall 21. The fourth side wall 15 is a component that protrudes from the lower surface and is adjacent to the first side wall 12. The fourth side wall 15 can be welded or bonded to the first end wall 11. When the first housing 10 has two first side walls 12 arranged 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 in the second direction x are respectively connected to the two first side walls 12.

[0149] The connecting portion 14 may protrude from the inside of the enclosed space to the outside of the enclosed space on the fourth side wall 15 , the connecting portion 14 may be integrally formed with the fourth side wall 15 , or the connecting portion 14 may be connected to the fourth side wall 15 by welding or bonding.

[0150] In some embodiments, combined Figure 10 By setting the fourth side wall 15, the size of the third side wall 23 in the first direction z can be reduced, that is, the larger the size of the fourth side wall 15 in the first direction z, the smaller the size of the third side wall 23 in the first direction z can be.

[0151] In the above scheme, the first box body 10 can be an upper box body, and the second box body 20 can be a lower box body. In the manufacturing process of the battery 100, the material cost and density of the upper box body can be lower than those of the lower box body. For this reason, the fourth side wall 15 is provided to increase the proportion of the first box body 10 in the battery 100, thereby effectively reducing the manufacturing cost of the battery 100 and improving the weight energy density of the battery 100.

[0152] In some embodiments, the size of the fourth side wall 15 in the first direction z can be set to be larger, and components such as explosion-proof valves, water-cooling connectors, or high and low voltage connectors can be installed on the fourth side wall 15.

[0153] According to some embodiments of the present application, the battery 100 further includes a second fastener (not shown in the figures), and the connecting portion 14 is connected to the second side surface 232 via the second fastener.

[0154] The second fastener is a connecting part 14 that connects the two side surfaces and the connecting part 14. In some embodiments, the second fastener can be a connecting part such as a rivet, a screw, or a bolt. In other embodiments, the second fastener can also be an adhesive layer arranged between the connecting part 14 and the second side surface 232.

[0155] In the above solution, a second fastener is provided to connect the second side surface 232 and the connecting portion 14 to improve the connection stability between the connecting portion 14 and the second side surface 232 , thereby improving the structural stability of the battery 100 .

[0156] According to some embodiments of the present application, Figure 7 and Figure 8 The connecting portion 14 is provided with a second through hole 140 , and the second side surface 232 is provided with a second threaded hole 2323 . The second fastener passes through the second through hole 140 and is connected to the second threaded hole 2323 .

[0157] The second through hole 140 may refer to a hole-like structure that passes through the outer surface and the inner surface of the connecting portion 14. The second side surface 232 is provided with a second threaded hole 2323, which may refer to a hole-like structure with an internal thread formed on the second side surface 232, such as a self-tapping thread; or may refer to a rivet nut or a pressure rivet nut provided on the second side surface 232. Figure 7 and Figure 8 The number of the second through holes 140 can be multiple, and the multiple second through holes 140 are arranged at intervals; the number of the second threaded holes 2323 is also multiple, and the first threaded holes 2100 are arranged corresponding to the first through holes 120.

[0158] “The second fastener passes through the second through hole 140 and is connected to the second threaded hole 2323 ” may mean that the second fastener has an external thread that matches the second threaded hole 2323 so as to be threadedly connected to the second threaded hole 2323 .

[0159] In the above scheme, the second fastener can be a connecting part 14 with external threads such as a bolt or a screw, 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 good sealing between the connecting part 14 and the second side surface 232.

[0160] According to some embodiments of this application, see Figure 3 The battery 100 further includes a second sealing member 31 , which is disposed between the connecting portion 14 and the second side surface 232 .

[0161] The second sealing member 31 may be a component having sealing properties and disposed between the connecting portion 14 and the second side surface 232. In some embodiments, the second sealing member 31 may be a sealant or a gasket, and the second sealing member 31 is clamped between the first flat surface 2320 and the connecting portion 14, between the second flat surface 2321 and the connecting portion 14, and between the transition surface 2322 and the connecting portion 14.

[0162] In the above solution, by providing the second sealing member 31 between the connecting portion 14 and the second side surface 232 , the sealing between the connecting portion 14 wall and the second side surface 232 can be improved, thereby improving the sealing of the battery 100 .

[0163] According to some embodiments of this application, see Figure 3 The battery 100 further includes a first sealing member 30, which is disposed between the first side wall 12 and the first side surface 210. Two ends of the first sealing member 30 are respectively connected to the two second sealing members 31.

[0164] exist Figure 3 In the figure, the first seal 30 corresponds to the connecting portion 14 between the first side surface 210 and the first side wall 12, which can extend along the length direction of the battery 100, and the second seal 31 corresponds to the connecting portion 14 between the second side surface 232 and the connecting portion 14, which includes a portion extending along the width direction of the battery 100, a portion extending along the height direction of the battery 100, and a portion corresponding to the transition surface 2322.

[0165] In some embodiments, the first seal 30 and the second seal 31 may be independent structures, connected by bonding or an intermediate connector. In other embodiments, the first seal 30 and the second seal 31 may be an integral structure.

[0166] In the above solution, the first sealing member 30 and the second sealing member 31 can be integrally formed or separately connected. By providing the first sealing member 30 and the second sealing member 31, good sealing can be achieved between the first box body 10 and the second box body 20, thereby improving the safety of the battery.

[0167] According to some other embodiments of this application, see Figure 11 , Figure 11 Schematic diagram of the second box body 20 in some other embodiments of the present 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.

[0168] The dimension of the third sidewall 23 in the first direction z can be considered the height of the third sidewall 23. "One third sidewall 23 has a dimension along the first direction z that is smaller than the other third sidewall 23" can mean that one third sidewall 23 is taller and the other is shorter. Since the heights of the two third sidewalls 23 are different, the resulting height difference can be compensated by the first housing 10.

[0169] In the above scheme, the third side wall 23 with a larger size can be installed with components such as explosion-proof valves, water-cooling connectors or high and low voltage connectors to ensure the normal charging and discharging operation of the battery 100; by reducing the size of the other third side wall 23, the size of the part of the first box body 10 corresponding to the third side wall 23 can be adaptively increased, thereby increasing the proportion of the first box body 10 in the battery 100 (in this embodiment, the first box body 10 can be an upper box body with lower material cost and density), thereby reducing the manufacturing cost of the battery 100 and increasing the weight energy density of the battery 100.

[0170] According to some embodiments of the present application, Figure 3 and Figure 5 The second end wall 21 is provided with a mounting portion 40 for mounting the battery 100 on an electrical device.

[0171] The mounting portion 40 is provided on the second end wall 21 and is used to mount the battery 100 on an electrical device. The mounting portion 40 can be a connecting structure such as a nut or a connecting bracket provided on the second end wall 21. In some embodiments, there can be multiple mounting portions 40, which can be arranged along the third direction y and the second direction x. In some embodiments, the mounting portion 40 can be an M8, M10, M12, or M16 threaded hole provided on the second end wall 21.

[0172] In the above solution, the second end wall 21 is provided with a mounting portion 40 to achieve stable assembly of the battery 100 and ensure that the battery 100 provides electrical energy.

[0173] According to some embodiments of the present application, there is also provided an electric device, comprising the battery 100 described above, for providing electric energy. In some embodiments, the electric device may be a vehicle, which may be a heavy truck or a bus.

[0174] According to some embodiments of the present application, the present application also provides a battery 100, see Figure 3 one Figure 8 The battery 100 includes a first case 10, a second case 20, and a battery cell. The first case 10 is the upper case of the battery 100, and the second case 20 is the lower case of the battery 100. The second case 20 and the first case 10 are connected to each other to form a closed space, and the battery cell is arranged in the closed space. The first case 10 includes a first end wall 11, two first side walls 12, and two connecting parts 14. The first end wall 11 can be the top wall of the battery 100, and the two first side walls 12 are arranged opposite to the first end wall 11 along the second direction x (the width direction of the battery 100). The two connecting parts 14 are respectively located at the two ends of the first case 10 in the third direction y (the length direction of the battery 100), and the connecting parts 14 surround an opening 13. The second case 20 includes 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 arranged opposite to each other along the second direction x. The second end wall 21 may be provided with a crossbeam 24. There may be multiple crossbeams 24, spaced apart along the third direction y. The crossbeams 24 enhance the structural strength of the second housing 20, and the battery cells may also be connected to the crossbeams 24. Two second sidewalls 22 are disposed relative to the second end wall 21 along the third direction y (the length of the battery 100). The second sidewalls 22 have a first flat surface 2320 facing the first end wall 11, two second flat surfaces 2321 disposed opposite each other along the second direction x, and a transition surface 2322 connecting the first flat surface 2320 and the second flat surface 2321.

[0175] The first end wall 11 and the second end wall 21 are arranged opposite each other along a first direction z (the height 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 disposed 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 fastener. The second side wall 22 corresponds to the connecting portion 14. A second seal 31 is disposed between the second side wall 22 and the connecting portion 14. The first flat surface 2320, the second flat surface 2321, and the transition surface 2322 are all connected to the connecting portion 14 via a second fastener.

[0176] A mounting portion 40 for mounting the battery 100 on an electrical device (such as a heavy truck or a bus) is provided on the crossbeam 24 .

[0177] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery, characterized in that: include: Battery cells; a first box body, the first box body comprising a first end wall and a first side wall; a second box body, the second box body and the first box body being connected to each other to jointly enclose a closed space for accommodating the battery cell, the second box body including a second end wall, the second end wall being arranged opposite to the first end wall along a first direction, the second end wall having a first side surface in a 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; a first sealing member disposed between the first sidewall and the first side surface; The first box body also includes two connecting parts, which are respectively located at the two ends of the first box body along the third direction, and the connecting parts form an opening; the second box body also includes two third side walls, which are arranged opposite to each other along the third direction and connected to the second end wall, and the two third side walls respectively close the two openings, the third side wall includes a third surface facing the enclosed space, a fourth surface away from the enclosed space, and a second side surface connecting the third surface and the fourth surface, and the connecting part is connected to the second side surface; the second side surface includes a first flat surface, a second flat surface and a transition surface, the first flat surface is arranged at one end of the third side wall away from the second end wall, and the two second flat surfaces are respectively arranged at the two ends of the third side wall along the second direction, and the transition surface connects the first flat surface and the second flat surface so that the first flat surface and the second flat surface transition smoothly, and the first direction, the second direction and the third direction intersect with each other.

2. The battery according to claim 1, characterized in that The inner surface of the first side wall is connected to the first side surface.

3. The battery according to claim 1, characterized in that The second end wall has a first surface facing the first end wall, and an end of the first side wall away from the first end wall extends beyond the first surface in a direction from the first end wall to the second end wall.

4. The battery according to claim 1, characterized in that The second end wall has a second surface facing away from the first end wall. In a direction from the first end wall to the second end wall, an end of the first side wall away from the first end wall does not exceed the second surface.

5. The battery according to claim 1, characterized in that The material density of the first box body is lower than the material density of the second box body.

6. The battery according to claim 5, characterized in that The first box body is made of plastic, and the second box body is made of aluminum alloy.

7. The battery according to claim 1, characterized in that The battery further includes a first fastener, and the first side wall is connected to the first side surface through the first fastener.

8. The battery according to claim 7, characterized in that 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 fastener passes through the first through hole and is connected to the first threaded hole.

9. The battery according to claim 1, characterized in that There are two first side walls, and the two first side walls are arranged opposite to each other along the second direction; the second end wall is located between the two first side walls, and the second end wall has two first side faces arranged opposite to each other along the second direction; the first side faces correspond to the first side walls one by one.

10. The battery according to claim 1, characterized in that The second box body further includes two second side walls, which are arranged opposite to each other along the second direction and connected to the second end wall, and the battery cell is arranged between the two second side walls.

11. The battery according to claim 1, characterized in that The second flat surface is flush with the first side surface.

12. The battery according to claim 1, characterized in that The first box body further includes a fourth side wall, the fourth side wall being adjacent to the first side wall; One end of the fourth side wall is connected to the first end wall, the connecting portion is provided at the other end of the fourth side wall, and the connecting portion protrudes from the fourth side wall in a direction away from the closed space.

13. The battery according to claim 1, characterized in that The battery further includes a second fastener, and the connecting portion is connected to the second side surface via the second fastener.

14. The battery according to claim 13, characterized in that The connecting portion is provided with a second through hole, the second side surface is provided with a second threaded hole, and the second fastener passes through the second through hole and is connected to the second threaded hole.

15. The battery according to claim 1, characterized in that The battery further includes a second sealing member disposed between the connecting portion and the second side surface.

16. The battery according to claim 15, characterized in that The battery further includes a first seal disposed between the first sidewall and the first side surface; Wherein, both ends of the first sealing member are respectively connected to the two second sealing members.

17. The battery according to claim 1, characterized in that A dimension of one of the third side walls along the first direction is smaller than a dimension of the other third side wall along the first direction.

18. The battery according to any one of claims 1 to 17, characterized in that The second end wall is provided with a mounting portion for mounting the battery on an electrical device.

19. An electrical device, characterized in that: The battery according to any one of claims 1 to 18 is used to provide electrical energy.

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