CN220492092U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery and power consumption device belongs to battery technical field. The battery includes battery monomer, first box and second box, and first box includes first end wall and two first lateral walls, and two first lateral walls set up relatively and connect in first end wall along the second direction. The second box includes second end wall and two second lateral walls, and second end wall sets up along first direction relatively with first end wall, and two second lateral walls set up along the third direction relatively and connect in the second end wall, and the second box encloses into the enclosure that is used for holding battery monomer jointly with first box. In the third direction, the end of the first end wall is provided with a first flange part protruding from the inner surface of the first end wall, the end of the first side wall is provided with a second flange part protruding from the inner surface of the first side wall, and the first flange part and the second flange part are both positioned on one side of the second side wall, which is away from the closed space, and are in sealing connection with the second side wall. By such a design, the energy density of the battery can be improved.

Description

Battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery and an electric device.

Background

Batteries are widely used in electronic devices such as electric vehicles, electric automobiles, heavy trucks, buses, spacecraft, electric airplanes, electric ships, and the like.

In the development of battery technology, how to increase the energy density of a battery is a technical problem to be solved in battery technology.

Disclosure of Invention

In view of the above, the present application provides a battery and an electric device capable of improving the energy density of the battery.

In a first aspect, the present application provides a battery, the battery includes battery cell, first box and second box, and first box includes first end wall and two first side walls, and two first side walls set up relatively and connect in first end wall along the second direction. The second box includes second end wall and two second lateral walls, and the second end wall sets up along first direction relatively with first end wall, and two second lateral walls set up along the third direction relatively and connect in the second end wall, and the second box encloses into jointly with first box and is used for holding the free enclosure space of battery, and first direction, second direction and two liang of crossing of third direction. In the third direction, the end of the first end wall is provided with a first flange part protruding from the inner surface of the first end wall, the end of the first side wall is provided with a second flange part protruding from the inner surface of the first side wall, and the first flange part and the second flange part are both positioned on one side of the second side wall, which is away from the closed space, and are in sealing connection with the second side wall.

In the technical scheme of this embodiment, the tip of first end wall is formed with the first flange portion of protrusion in the internal surface of first end wall, and the tip of first lateral wall is formed with the second flange portion of protrusion in the internal surface of first lateral wall, and first flange portion and second flange portion all are located one side that the second lateral wall deviates from the enclosure space and with second lateral wall sealing connection. The sealing connection mode of the first flange part, the second flange part and the second side wall is adopted, so that part of sealing surfaces of the first box body and the second box body are vertical surfaces, and the risk that the sealing surfaces occupy too much space inside the battery is reduced. And further, the battery can accommodate more battery monomers, and the energy density of the battery is improved.

In some embodiments, the battery further comprises a first seal, a portion of the first seal being disposed between the first flange portion and the second sidewall, and another portion of the first seal being disposed between the second flange portion and the second sidewall.

In the above aspect, the sealing properties of the sealing surfaces between the first flange portion and the second side wall and between the second flange portion and the second side wall can be improved by providing the first seal between the first flange portion and the second side wall and between the second flange portion and the second side wall, and the sealing properties of the battery can be further improved. At the same time, the battery maintains high sealability and high energy density.

In some embodiments, a side of the second sidewall facing away from the enclosed space is provided with a first groove, and the first seal is disposed in the first groove.

In the above scheme, one side of the second side wall deviating from the enclosure space is provided with first recess, and first sealing member sets up in first recess. By the design, on one hand, the wall surface of the first groove can be used as a mounting reference surface of the first sealing element, and the first sealing element is convenient to assemble. On the other hand. The first groove accommodates the partial first sealing member, and then has reduced the height of first flange portion and second flange portion along the protruding second box of third direction, under the prerequisite that does not reduce battery inner space, has reduced the space that the battery occupy, has further improved the energy density of battery.

In some embodiments, the second sidewall has a first surface facing away from the enclosed space, a second surface facing toward the enclosed space, and a first side connecting the first surface and the second surface. One side in the width direction of the first groove extends to the first side face.

In the above aspect, one side in the width direction of the first groove extends to the first side face. On the one hand, the first groove is reduced by one side wall, the risk of processing deformation of the first groove is reduced, the forming difficulty of the second box body is reduced, and the yield of the battery is improved. On the other hand, the width of the first sealing member which can be accommodated by the first groove is increased, and therefore the sealing performance of the battery is improved.

In some embodiments, the second end wall has a second side in the third direction, the first surface being flush with the second side.

In the scheme, after the first box body and the second box body are assembled, the first surface is flush with the second side surface, so that the risk of excessive gaps between the first box body and the second end wall can be reduced, and the sealing performance of the battery can be improved. At the same time, the battery has higher energy density.

In some embodiments, the second end wall includes a first portion and a second portion, the second portion being located on one side of the first portion and connected to the first portion in the third direction. The dimension of the first portion in the second direction is greater than the dimension of the second portion in the second direction.

In the above aspect, the second end wall includes a first portion and a second portion, and the first portion is sized larger in the second direction than the second portion to form a gap between the first portion and the second portion, or an end of the second end wall is narrowed. Because the end of the second end wall is not utilized by the battery monomer, the volume of the battery can be reduced by narrowing the part, the installation space of the battery is saved, and the weight reduction effect of the battery can be realized on the other hand, so that the battery is light.

In some embodiments, the first portion has a third side in the third direction, and the bottom surface of the first recess is flush with the third side.

In the scheme, the bottom surface of the first groove is flush with the third side surface. The risk of generating too much gap between the bottom surface of first recess and the second end wall is favorable to reducing, and then improves the leakproofness of battery.

In some embodiments, the first portion has a fourth side in the second direction, one end of the first side wall is connected to the first end wall, the other end of the first side wall is connected to the fourth side, and the fourth side smoothly transitions with the third side.

In the above scheme, one end of the first side wall is connected to the first end wall, the other end of the first side wall is connected to the fourth side surface, and the fourth side surface and the third side surface are in smooth transition. The sealing surface between the first side wall and the fourth side surface and the sealing surface between the bottom surface of the first groove and the first box body are in smooth transition, so that the sealing structure can be smoothly arranged at the position, and the risk of failure of the sealing structure caused by stress concentration is reduced.

In some embodiments, the battery further comprises a first fastener and a second fastener, the first flange portion being connected to the second sidewall by the first fastener, the second flange portion being connected to the second sidewall by the second fastener.

In the scheme, the first flange part and the second side wall are connected through the first fastener, so that high connection stability is achieved between the first flange part and the second side wall, and the second flange part and the second side wall are connected through the second fastener, so that high connection stability is achieved between the second flange part and the second side wall, and therefore structural stability of the battery is improved.

In some embodiments, the first flange portion is provided with a first through hole, the second sidewall is provided with a first threaded hole, the first fastener passes through the first through hole and is connected to the first threaded hole, the second flange portion is provided with a second through hole, the second sidewall 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.

In the above scheme, the first fastener can be a connecting part with external threads such as a bolt, a screw and the like, can be effectively connected in the first threaded hole, improves the connection stability between the first flange part and the second side wall and ensures that the first flange part and the second side wall have good tightness. The second fastener may be a connection member having external threads such as a bolt, a screw, or the like, which can be effectively connected in the second screw hole, improving connection stability between the second flange portion and the second sidewall and enabling good sealability between the second flange portion and the second sidewall.

In some embodiments, the second end wall has a fourth side in the second direction, one end of the first side wall is connected to the first end wall, and the other end of the first side wall is connected to the fourth side.

In the above-mentioned scheme, through the one end with the first lateral wall of first box be connected with the fourth side of second box in order to realize the connection of first box and second box, can not set up under the condition of following the convex flange structure of second direction and realize the connection of first box and second box to improve the battery and in the ascending space utilization of second direction, with hold more battery monomer or reduce the volume of battery, and then improve the volumetric energy density of battery.

In some embodiments, the inner surface of the first side wall is connected to the fourth side surface.

In the above-mentioned scheme, by connecting the inner surface of the first side wall (i.e., the surface of the first side wall facing the fourth side surface) with the fourth side surface, the size of the battery in the second direction can be effectively reduced to increase the volumetric energy density of the battery as much as possible.

In some embodiments, the battery further comprises a second seal disposed between the first sidewall and the fourth side.

In the above scheme, the second sealing member is arranged between the first side wall and the fourth side surface, so that the sealing property between the first side wall and the fourth side surface can be improved, and the sealing property of the battery is further improved.

In some embodiments, the battery further comprises a third fastener by which the first side wall is connected to the fourth side.

In the scheme, the first side wall and the fourth side face are connected through the third fastener, so that higher connection stability is achieved between the first side wall and the fourth side face, and the structural stability of the battery is improved.

In some embodiments, the material density of the first tank is less than the material density of the second tank.

In the scheme, the material density of the first box body is smaller than that of the second box body, so that the density of the battery is reduced, the weight of the battery is reduced under the same volume, and the weight energy density of the battery is further improved.

In some embodiments, the material of the first housing is plastic and the material of the second housing is an aluminum alloy.

In the scheme, the first box body can be an upper box body of the battery, the second box body can be a lower box body of the battery, and the second box body is made of an aluminum alloy material, so that the second box body has higher structural strength and rigidity, and plays a higher protection role on a battery monomer. The first box body serves as an upper box body to seal the battery monomer and the upper box body and the lower box body, is made of plastic, can effectively reduce the manufacturing cost of the battery, and can effectively reduce the weight of the battery to improve the weight energy density of the battery.

In some embodiments, the second end wall is configured to carry a battery cell.

In the scheme, the second end wall can be used as an assembly matrix when the battery cells are assembled, so that the battery cells can be assembled conveniently.

In a second aspect, the present application also provides an electrical device comprising a battery according to any one of the first aspects, the battery being adapted to provide electrical energy.

The foregoing description is merely an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make other objects, features and advantages of the present application more understandable, the following specific embodiments of the present application are specifically described below.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

FIG. 2 is an isometric view of a battery according to some embodiments of the present application;

Fig. 3 is an exploded view of a partial structure of a battery according to some embodiments of the present application;

FIG. 4 is an isometric view of a first seal and a second seal mated in accordance with some embodiments of the present application;

FIG. 5 is an isometric view of a first housing according to some embodiments of the present application;

FIG. 6 is an isometric view of a second housing according to some embodiments of the present application;

FIG. 7 is an isometric view of a second end wall according to some embodiments of the present application;

fig. 8 is an isometric view of a second sidewall of some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1000-vehicle; 200-a controller; 300-motor; 100-cell; 10-a first box body; 11-a first end wall; 111-a first flange portion; 12-a first sidewall; 121-a second flange portion; 20-a second box; 21-a second end wall; 211-a second side; 2121-third side; 2122-fourth side; 2123-transition surfaces; 212-a first part; 213-a second part; 22-a second sidewall; 221-a first groove; 222-a first surface; 223-a second surface; 224-a first side; 31-a first seal; 32-a second seal; x-a first direction; y-a second direction; z-third direction.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, a battery referred to in this application may include one or more battery cells.

In the present application, the battery cell may include, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like. The shape of the battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc. The battery cells may include, but are not limited to, cylindrical battery cells, prismatic battery cells, blade battery cells, and pouch battery cells in a packaged manner.

In some high power applications, such as electric vehicles, the application of batteries includes three levels: battery cell, battery module, and battery. The battery module is formed by electrically connecting a certain number of battery cells together and putting the same into one frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system incorporated into the electric vehicle. Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

The battery generally includes first box and second box, and first box and second box are connected to enclose into the enclosure jointly, and the battery monomer sets up in the enclosure, in order to reduce the risk that liquid or other foreign matter influence the battery monomer charge or discharge.

The surfaces of the first box body and the second box body, which are in contact with each other after assembly, are generally sealing surfaces, the sealing surfaces are generally provided with sealing structures to improve the tightness of the first box body and the second box body, and the sealing surfaces are required to have a certain width in order to achieve the sealing standard of the battery industry.

The development of battery technology is taking into consideration various design factors such as reliability, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the energy density of the battery.

The energy density of a battery refers to the electrical energy released by the average unit volume or mass of the battery. The greater the energy density of the battery, the more energy is stored per unit volume or weight. For example, the larger the internal space of the battery for housing the battery cells, the larger the volumetric energy density of the battery, on the premise that the total occupied space of the battery is unchanged. For example, the smaller the total space occupied by the battery, the greater the volumetric energy density of the battery, provided that the internal space of the battery for housing the battery cells is unchanged.

In order to not reduce the space inside the battery on the premise of setting the sealing surface with a certain width, the edges of the first box body and the second box body of the common battery are provided with flange structures protruding to the outer side of the battery, and the joint surface between the flange structures of the first box body and the second box body is set as the sealing surface, and the sealing surface is generally a wider horizontal surface. However, the sealing surfaces between the raised flange structures occupy a large amount of additional space, resulting in low cell space utilization and affecting the volumetric energy density of the cell.

In view of this, the present application provides a battery, and the battery includes battery monomer, first box and second box, and first box includes first end wall and two first lateral walls, and two first lateral walls set up relatively and connect in first end wall along the second direction. The second box includes second end wall and two second lateral walls, and the second end wall sets up along first direction relatively with first end wall, and two second lateral walls set up along the third direction relatively and connect in the second end wall, and the second box encloses into jointly with first box and is used for holding the free enclosure space of battery, and first direction, second direction and two liang of crossing of third direction. In the third direction, the end of the first end wall is provided with a first flange part protruding from the inner surface of the first end wall, the end of the first side wall is provided with a second flange part protruding from the inner surface of the first side wall, and the first flange part and the second flange part are both positioned on one side of the second side wall, which is away from the closed space, and are in sealing connection with the second side wall. The sealing connection mode of the first flange part, the second flange part and the second side wall is adopted, so that part of sealing surfaces of the first box body and the second box body are vertical surfaces, and the risk that the sealing surfaces occupy too much space inside the battery is reduced. And further, the battery can accommodate more battery monomers, and the energy density of the battery is improved.

The technical scheme described by the embodiment of the application is suitable for battery monomers, batteries and electric equipment using the batteries.

Powered devices include, but are not limited to: battery cars, electric vehicles, ships, and spacecraft, etc., for example, spacecraft including airplanes, rockets, space shuttles, and spacecraft, etc.

The battery disclosed in the embodiments of the present application may be used for, but is not limited to, battery cabinets, container-type energy storage devices, and the like. The energy storage device may include a plurality of batteries as disclosed herein.

The battery disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system of the electric equipment can be composed by using a battery disclosed by the application.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a heavy truck, a bus, a spacecraft and the like. Among other things, spacecraft may include airplanes, rockets, space shuttles, spacecraft, and the like.

For convenience of description, the following embodiment will take an electric device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The vehicle 1000 may be of the type of a sedan, an off-road vehicle, a heavy truck, a bus, or the like. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for the circuitry of vehicle 1000, such as for the operational power requirements of vehicle 1000 during start-up, navigation, and operation.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

To meet different power requirements, the battery 100 may include a plurality of battery cells, where the plurality of battery cells may be connected in series or parallel or a series-parallel connection, and the series-parallel connection refers to a mixture of series and parallel connection. Battery 100 may also be referred to as a battery pack. Alternatively, a plurality of battery cells may be connected in series or parallel or in series-parallel to form a battery module, and then connected in series or parallel or in series-parallel to form the battery 100. That is, a plurality of battery cells may directly constitute the battery 100, or may first constitute a battery module, which then constitutes the battery 100.

For example, referring to fig. 2, fig. 2 is an isometric view of a battery 100 according to some embodiments of the present application, and the battery 100 may include a plurality of battery cells. The battery 100 may further include a case having a closed chamber inside which a plurality of battery cells are accommodated. As shown in fig. 2, the case includes a first case 10 and a second case 20, and the first case 10 and the second case 20 are fastened together. The shapes of the first casing 10 and the second casing 20 may be determined according to the shape of the combination of the plurality of battery cells, and the first casing 10 and the second casing 20 may each have one opening or may have a frame structure composed of a plurality of wall portions. For example, referring to fig. 3, the first case 10 may include five wall portions, wherein two opposite wall portions along the length direction of the first case 10 are composed of a first flange portion 111 and a second flange portion 121, one end along the height direction of the first case 10 is a first end wall 11, and one end along the width direction of the first case 10 is two first side walls 12. The five wall portions are enclosed to form a box structure having one opening, and two opposite wall portions along the length direction of the first box body 10 are provided with notches, that is, two second flange portions 121 and one first flange portion 111 define the notches. The second casing 20 may include three wall portions, where the three wall portions form a U-shaped frame, and two wall portions opposite to each other along the length direction of the second casing 20 are in one-to-one correspondence with the notches and are used for closing the notches corresponding thereto. And the first casing 10 and the second casing 20 are fastened to each other to form a casing having a closed chamber. The battery cells are mutually connected in parallel or in series-parallel combination and then are arranged in the closed cavity.

Alternatively, the battery 100 may further include other structures, which are not described in detail herein. For example, the cell may further comprise a bussing member for making electrical connection between a plurality of cells, e.g. parallel or series-parallel. Specifically, the bus member may realize electrical connection between the battery cells by connecting electrode terminals of the battery cells. Further, the bus member may be fixed to the electrode terminals of the battery cells by welding. The electric energy of the plurality of battery cells can be further led out through the box body by the conducting mechanism.

The number of battery cells may be set to any number according to different power requirements. The plurality of battery cells can be connected in series, parallel or series-parallel to realize larger capacity or power. Since the number of battery cells included in each battery 100 may be large, the battery cells may be arranged in groups for easy installation, and each group of battery cells constitutes a battery module. The number of battery cells included in the battery module is not limited and may be set according to requirements. The battery 100 may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel. The plurality of battery cells can also be arranged into groups and one or more battery packs are formed by the bundling piece, and the bundled battery packs are accommodated in the closed space. The plurality of battery packs may be arranged in the length, width, or height directions of the case.

Referring to fig. 3, according to some embodiments of the present application, a battery 100 is provided, where the battery 100 includes a battery cell (not shown in the drawings), a first case 10 and a second case 20, and the first case 10 includes a first end wall 11 and two first side walls 12, and the two first side walls 12 are disposed opposite to each other along a second direction Y and connected to the first end wall 11. The second case 20 includes a second end wall 21 and two second side walls 22, the second end wall 21 and the first end wall 11 are disposed opposite to each other along a first direction X, the two second side walls 22 are disposed opposite to each other along a third direction Z and are connected to the second end wall 21, the second case 20 and the first case 10 together enclose a closed space for accommodating the battery cells, and the first direction X, the second direction Y and the third direction Z intersect each other two by two. In the third direction Z, the end of the first end wall 11 is formed with a first flange portion 111 protruding from the inner surface of the first end wall 11, the end of the first side wall 12 is formed with a second flange portion 121 protruding from the inner surface of the first side wall 12, and both the first flange portion 111 and the second flange portion 121 are located on the side of the second side wall 22 facing away from the closed space and are in sealing connection with the second side wall 22.

The first casing 10 includes a first end wall 11 and two first side walls 12, the two first side walls 12 being disposed opposite to each other in the second direction Y and connected to the first end wall 11. Meaning that the first casing 10 includes the above three complete wall portions, the first casing 10 is provided with a set of flange portions at both ends in the third direction Z, each set of flange portions including two second flange portions 121 and one first flange portion 111, each set of flange portions also being regarded as one of the wall portions of the first casing 10.

The first flange portion 111 and the second flange portion 121 are both located on the side of the second side wall 22 facing away from the closed space and are in sealing connection with the second side wall 22, meaning that the surfaces of the first flange portion 111 and the second flange portion 121 on the side of the second side wall 22 facing away from the closed space are sealing surfaces. In other words, the sealing surface is a non-horizontal surface of a vertical plane, and its projection in the first direction X is a straight line. By such arrangement, the width of the sealing surface in the third direction Z is reduced, the total volume of the battery 100 is reduced, and the energy density of the battery 100 is improved without reducing the internal space of the battery 100. The sealing connection may be achieved by welding or assembling a sealing structure. The reduced width of the sealing surface means a reduced width of the weld or of the sealing structure. Taking the case of providing a sealing structure on the sealing surface as an example, the greater the width of the sealing structure, the better the sealability of the battery 100. In order to achieve the tightness required by the battery 100, the sealing structure needs to be wider, and the sealing structure is arranged on the vertical face, so that the size of the sealing structure in the third direction Z is reduced as much as possible on the premise that the sealing structure has a larger width, and the total space occupied by the battery 100 is further reduced.

The first flange 111 may be provided on the inner surface of the first end wall 11 by welding, bonding, bolting, or the like, or may be integrally formed with the first end wall 11. The second flange 121 may be provided on the inner surface of the first side wall 12 by welding, bonding, bolting, or the like, or may be integrally formed with the first side wall 12.

In some embodiments, a first box 10 may be prefabricated with five walls defining an enclosed space having an opening, the second end wall 21 closing the opening. Then, a notch is formed in one of the walls of the first case 10, and the edge of the notch and the edge of the adjacent wall of the wall where the notch is formed may define a first flange 111 and a second flange 121.

In some embodiments, first case 10 may be considered an upper case of battery 100, first end wall 11 may be considered a top wall of battery 100, and first side wall 12 may be a portion having one end connected to first end wall 11 and not in the same plane as first end wall 11; the first side wall 12 may be connected to the first end wall 11 by welding, bonding, bolting, or the like, and the first side wall 12 may be integrally formed with the first end wall 11.

The second case 20 may be regarded as a lower case of the battery 100, the second end wall 21 may be regarded as a bottom wall of the battery 100, and the first direction X may be a height direction of the battery 100, i.e., the top wall and the bottom wall are disposed opposite to each other in the height direction of the battery 100. The first direction X can also be understood as the direction of gravity. The second side wall 22 may be a portion connected to the second end wall 21 and not in the same plane with the second end wall 21; the second side wall 22 may be connected to the second end wall 21 by welding, bonding, bolting, or the like, and the second side wall 22 may be integrally formed with the second end wall 21.

The first casing 10 and the second casing 20 are connected to each other to form a closed space capable of accommodating the battery cells.

The intersection of the first direction X, the second direction Y and the third direction Z does not include the case where the first direction X, the second direction Y and the third direction Z are coplanar.

In the technical solution of this embodiment, the end portion of the first end wall 11 is formed with a first flange portion 111 protruding from the inner surface of the first end wall 11, the end portion of the first side wall 12 is formed with a second flange portion 121 protruding from the inner surface of the first side wall 12, and the first flange portion 111 and the second flange portion 121 are both located at one side of the second side wall 22 facing away from the enclosed space and are in sealing connection with the second side wall 22. By adopting the sealing connection form of the first flange part 111, the second flange part 121 and the second side wall 22, part of sealing surfaces of the first box body 10 and the second box body 20 can be vertical surfaces, so that the risk that the sealing surfaces occupy the space inside the excessive battery 100 is reduced. Thereby allowing the battery 100 to accommodate more battery cells and improving the energy density of the battery 100.

Referring to fig. 3 and 4, according to some embodiments of the present application, the battery 100 further includes a first sealing member 31, a portion of the first sealing member 31 is disposed between the first flange portion 111 and the second sidewall 22, and another portion of the first sealing member 31 is disposed between the second flange portion 121 and the second sidewall 22.

The first seal 31 may be a member having sealing characteristics. In some embodiments, the first seal 31 may be a sealant or gasket.

In some embodiments, the first seal 31 may be pre-attached to the second sidewall 22 by adhesive or the like.

The first seal 31 may comprise multiple segments, which may be integrally formed or may be spliced to one another.

In the above-described embodiments, the first seal 31 is provided between the first flange 111 and the second side wall 22 and between the second flange 121 and the second side wall 22, so that the sealing properties of the sealing surfaces between the first flange 111 and the second side wall 22 and between the second flange 121 and the second side wall 22 can be improved, and the sealing properties of the battery 100 can be further improved. At the same time, the battery 100 is maintained at a high sealability and a high energy density at the same time.

According to some embodiments of the present application, referring to fig. 3 and 4, a side of the second sidewall 22 facing away from the enclosed space is provided with a first groove 221, and the first sealing member 31 is disposed in the first groove 221.

The first groove 221 may be integrally formed while the second sidewall 22 is formed, or the second sidewall 22 may be formed first and then the first groove 221 may be formed by machining or the like.

In some embodiments, the first groove 221 may include a plurality of segments, and the extending directions of the plurality of segments of the first groove 221 may be different.

The groove side wall of the first groove 221 may serve as a mounting reference surface of the first seal 31, and the bottom wall of the first groove 221 may serve as a sealing surface.

In some embodiments, the first groove 221 does not overlap with the edge of the second sidewall 22, i.e., the first groove 221 is disposed inside the second sidewall 22. Accordingly, in other embodiments, the inner surface of the wall of the first casing 10 corresponding to the second side wall 22 may be further provided with a second groove, and the second groove and the first groove 221 cooperate to limit the first sealing member 31. In other embodiments, the wall of the first casing 10 corresponding to the second side wall 22 is a flat wall, and the inner surface of the flat wall cooperates with the first groove 221 to limit the first sealing member 31 together.

The first seal 31 may be partially accommodated in the first groove 221 or may be entirely accommodated in the first groove 221. Such an arrangement corresponds to a further reduction in the space occupied by the battery 100 in the third direction Z, with the thickness of the first seal member 31 unchanged.

In the above-mentioned solution, the side of the second side wall 22 facing away from the enclosed space is provided with the first groove 221, and the first sealing member 31 is disposed in the first groove 221. In such a design, on one hand, the wall surface of the first groove 221 may serve as a mounting reference surface of the first sealing member 31, so as to facilitate the assembly of the first sealing member 31. On the other hand. The first groove 221 accommodates a portion of the first sealing member 31, thereby reducing the height of the first flange portion 111 and the second flange portion 121 protruding from the second case 20 in the third direction Z, reducing the space occupied by the battery 100 without reducing the internal space of the battery 100, and further improving the energy density of the battery 100.

Referring to fig. 3 and 4, according to some embodiments of the present application, the second sidewall 22 has a first surface 222 facing away from the enclosed space, a second surface 223 facing toward the enclosed space, and a first side 224 connecting the first surface 222 and the second surface 223. One side in the width direction of the first groove 221 extends to the first side 224.

The side of the second side wall 22 facing away from the enclosed space is provided with a first recess 221, and the second side wall 22 has a first surface 222 facing away from the enclosed space, meaning that in this embodiment, the first recess 221 is formed in the first surface 222.

The first side 224 is the surface of the second sidewall 22 that is outermost in the second direction Y and the first direction X, and may be understood as a side for connecting the first surface 222 and the second surface 223 when the second sidewall 22 is not provided with the first groove 221.

One side of the first groove 221 in the width direction extends to the first side 224, meaning that the first groove 221 coincides with the edge of the first side wall 12. Such an arrangement increases the size of the bottom wall of the first recess 221 in the second direction Y and the first direction X as much as possible, i.e., increases the size of the sealing surface in the second direction Y and the first direction X. Further, in some embodiments, it may be advantageous to provide a wider seal arrangement at the sealing surface.

Referring to fig. 4, in some embodiments, the first groove 221 has no outer groove wall in the second direction Y and the first direction X, so that machining of at least one corner is omitted during machining, and the risk of machining deformation of the first groove 221 is reduced.

In the above-described aspect, one side of the first groove 221 in the width direction extends to the first side 224. On the one hand, the first groove 221 reduces one side wall, reduces the risk of processing deformation of the first groove 221, reduces the molding difficulty of the second case 20, and improves the yield of the battery 100. On the other hand, the width of the first groove 221, which can accommodate the first sealing member 31, is increased, thereby advantageously improving sealability of the battery 100.

Referring to fig. 3 and 6, according to some embodiments of the present application, the second end wall 21 has a second side 211 in the third direction Z, and the first surface 222 is flush with the second side 211.

The first surface 222 is flush with the second side surface 211, which may mean that an outer side surface of the second side wall 22 in the third direction Z is flush with an outer side surface of the second end wall 21 in the second direction Y, that is, an outer surface of the second case 20 in the second direction Y is a flat surface.

In the above-mentioned scheme, after first box 10 and second box 20 assembly are accomplished, first surface 222 and second side 211 parallel and level can reduce the risk that first box 10 and second end wall 21 appear too much gap, are favorable to improving the leakproofness of battery 100. At the same time, the battery 100 is made to have a high energy density.

Referring to fig. 3 and 7, according to some embodiments of the present application, the second end wall 21 includes a first portion 212 and a second portion 213, and the second portion 213 is located at one side of the first portion 212 and connected to the first portion 212 along the third direction Z. The dimension of the first portion 212 in the second direction Y is greater than the dimension of the second portion 213 in the second direction Y.

The second end wall 21 may include a first portion 212 and a second portion 213. "in the third direction Z, the second portion 213 is located at one side of the first portion 212 and connected to the first portion 212" may mean that an end of the first portion 212 may be connected to the second portion 213 in the third direction Z. In some embodiments, in the third direction Z, the second portion 213 may be provided at both ends of the first portion 212.

By "the dimension of the first portion 212 in the second direction Y is greater than the dimension of the second portion 213 in the second direction Y" it is understood that the dimension of the upper end of the second end wall 21 in the second direction Y is reduced.

In some embodiments, the first portion 212 may be a location of the second end wall 21 for carrying a battery cell, and the second portion 213 may not carry a battery cell, e.g., a projection of the battery cell does not fall on the second portion 213 along the first direction X.

In the above-described aspect, the second end wall 21 includes the first portion 212 and the second portion 213, and the first portion 212 is set to be larger in the second direction Y than the second portion 213 in the second direction Y to form a gap between the first portion 212 and the second portion 213, or the end of the second end wall 21 is narrowed. Since the end of the second end wall 21 is not used by the battery cell, by narrowing this portion, on the one hand, the volume of the battery 100 can be reduced, the installation space of the battery 100 can be saved, and on the other hand, the effect of weight reduction of the battery 100 can be achieved, so that the battery 100 is light-weighted.

Referring to fig. 3, 6 and 7, according to some embodiments of the present application, the first portion 212 has a third side 2121 in the third direction Z, and the bottom surface of the first groove 221 is flush with the third side 2121.

If the bottom surface of the first groove 221 is not flush with the third side 2121, in some embodiments, a step surface is formed between the bottom surface of the first groove 221 and the third side 2121, and after the first case 10 and the second case 20 are assembled, more gaps exist at the step surface, so that the sealing difficulty of the battery 100 is increased. In contrast, if the bottom surface of the first groove 221 is flush with the third side 2121, the bonding position between the bottom surface of the first groove 221 and the third side 2121 is a flat surface, which has a small number of gaps and small sealing difficulty, and is equivalent to improving the sealability of the battery 100.

In some embodiments, the second side wall 22 and the second end wall 21 are integrally formed, the bottom surface of the first groove 221 is flush with the third side 2121, and no gap exists between the bottom surface of the first groove 221 and the third side 2121, so that the sealability of the battery 100 can be further improved.

In the above-described embodiment, the bottom surface of the first groove 221 is flush with the third side surface 2121. It is advantageous to reduce the risk of excessive gaps between the bottom surface of the first groove 221 and the second end wall 21, thereby improving the sealability of the battery 100.

Referring to fig. 3, 4, 6 and 7, the first portion 212 has a fourth side 2122 along the second direction Y, one end of the first side wall 12 is connected to the first end wall 11, the other end of the first side wall 12 is connected to the fourth side 2122, and the fourth side 2122 and the third side 2121 smoothly transition.

The smooth transition of the fourth side 2122 with the third side 2121 may be understood as a non-right angle transition of the fourth side 2122 with the third side 2121. The fourth side 2122 and the third side 2121 may transition via a transition face 2123. In some embodiments, the transition surface 2123 may be generally arcuate, and the transition surface 2123 may also include one or more flat surfaces and one or more arcuate surfaces.

Referring to fig. 4 and 6, fig. 4 is an isometric view of a seal structure in some embodiments, fig. 6 is an isometric view of a lower case in some embodiments, the fourth side 2122 and the third side 2121 are both sealing surfaces, and in embodiments where the sealing surfaces are provided with a seal structure, a right angle transition may exist between the fourth side 2122 and the third side 2121, where the right angle transition may cause a point of greater stress concentration in the seal structure, thereby increasing the risk of failure of the seal structure. In some embodiments, the sealing structure may include a first sealing member 31 and a second sealing member 32 that are connected to each other, further referring to fig. 7, the fourth side 2122 and the third side 2121 transition through an arc surface, and the corresponding positions of the sealing structure corresponding to the transition surface 2123 may also be arranged in an arc shape, so as to reduce the risk of failure of the sealing member.

In the above-mentioned embodiments, one end of the first side wall 12 is connected to the first end wall 11, and the other end of the first side wall 12 is connected to the fourth side 2122, and the fourth side 2122 and the third side 2121 smoothly transition. The smooth transition between the sealing surface between the first side wall 12 and the fourth side face 2122 and the sealing surface between the bottom surface of the first groove 221 and the first case 10 enables the sealing structure to be smoothly disposed at the above-described position, reducing the risk of failure of the sealing structure due to stress concentration.

According to some embodiments of the present application, the battery 100 further includes a first fastener (not shown) by which the first flange portion 111 is connected to the second sidewall 22, and a second fastener (not shown) by which the second flange portion 121 is connected to the second sidewall 22.

The first fastener is a connecting member connecting the first flange portion 111 and the second side wall 22, and in some embodiments, the first fastener may be a rivet, a screw, a bolt, or the like, and in other embodiments, the first fastener may be an adhesive layer provided between the first flange portion 111 and the second side wall 22.

The second fastener is a connecting member connecting the second flange portion 121 and the second side wall 22, and in some embodiments, the second fastener may be a rivet, a screw, a bolt, or the like, and in other embodiments, the second fastener may be a connecting member provided between the second flange portion 121 and the second side wall 22.

In the embodiment where the sealing surface is provided with a sealing structure, the first fastener and the second fastener may penetrate through the sealing structure and may also press against the sealing structure.

The first fastener and the second fastener may each be provided in plurality.

In the above-mentioned scheme, the first flange portion 111 and the second sidewall 22 are connected by providing the first fastener so that the first flange portion 111 and the second sidewall 22 have higher connection stability, and the second flange portion 121 and the second sidewall 22 are connected by providing the second fastener so that the second flange portion 121 and the second sidewall 22 have higher connection stability, so that the structural stability of the battery 100 is improved.

According to some embodiments of the present application, the first flange portion 111 is provided with a first through hole (not shown in the drawings), the second sidewall 22 is provided with a first threaded hole (not shown in the drawings), the first fastener (not shown in the drawings) passes through the first through hole and is connected to the first threaded hole, the second flange portion 121 is provided with a second through hole (not shown in the drawings), the second sidewall 22 is provided with a second threaded hole (not shown in the drawings), and the second fastener (not shown in the drawings) passes through the second through hole and is connected to the second threaded hole.

The first through hole may refer to a hole-like structure penetrating the outer and inner surfaces of the first flange portion 111. "the second side wall 22 is provided with a first threaded hole", which may refer to a hole-like structure formed in the second side wall 22 with internal threads, such as self-tapping threads; or may refer to a threaded hole of a blind rivet nut or a threaded hole of a clinch nut provided in the second side wall 22. The number of the first through holes can be a plurality of, and the plurality of first through holes are distributed at intervals along the second direction Y; the number of the first threaded holes is also a plurality of, and the first threaded holes are correspondingly arranged with the first through holes.

By "the first fastener passing through the first through hole and being connected to the first threaded hole" it is meant that the first fastener has an external thread that mates with the first threaded hole to be able to be screwed with the first threaded hole.

The second through hole may refer to a hole-like structure penetrating the outer and inner surfaces of the second flange portion 121. "the second side wall 22 is provided with a second threaded hole", which may refer to a hole-like structure formed in the second side wall 22 with internal threads, such as self-tapping threads; or may refer to a threaded hole of a blind rivet nut or a threaded hole of a clinch nut provided in the second side wall 22. The number of the second through holes can be multiple, and the second through holes are distributed at intervals along the third direction Z; the number of the second threaded holes is also a plurality of, and the forehead threaded holes are correspondingly arranged with the second through holes.

In the above-mentioned aspect, the first fastener may be a connection member having external threads, such as a bolt, a screw, or the like, and may be effectively connected to the first threaded hole, thereby improving connection stability between the first flange portion 111 and the second side wall 22 and enabling good sealing between the first flange portion 111 and the second side wall 22. The second fastener may be a connection member having external threads such as a bolt, a screw, or the like, which can be effectively connected in the second screw hole, improves connection stability between the second flange portion 121 and the second side wall 22, and provides good sealability between the second flange portion 121 and the second side wall 22.

Referring to fig. 3 and 5-7, the second end wall 21 has a fourth side 2122 in the second direction Y, one end of the first side wall 12 is connected to the first end wall 11, and the other end of the first side wall 12 is connected to the fourth side 2122.

In some embodiments, the fourth side 2122 may be a surface of the second end wall 21 in the second direction Y. In some embodiments, the fourth side 2122 may not be a surface of the second end wall 21 in the second direction Y, for example, the fourth side 2122 may be a surface of other components provided to the second end wall 21 in the second direction Y. In some embodiments, the fourth side 2122 may protrude toward the first case 10 than a surface of the second end wall 21 in the second direction Y.

Correspondingly, the fourth side 2122 may be understood as a surface of the second end wall 21 that does not face or face away from the first end wall 11. In some embodiments, the first direction X is perpendicular to the second direction Y.

"one end of the first side wall 12 is connected to the first end wall 11, the other end of the first side wall 12 is connected to the fourth side 2122", which 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 remote from the first end wall 11 is directly or indirectly connected to the fourth side 2122, it may be understood that the connection surface of the first side wall 12 and the first end wall 11 is located on the fourth side 2122 without protruding from the external contours of the first casing 10 and the second casing 20 in the second direction Y. "the end of the first side wall 12 remote from the first end wall 11 is directly or indirectly connected to the fourth side 2122" may mean that the first side wall 12 is directly connected to the fourth side 2122 or that the first side wall 12 is indirectly connected to the fourth side 2122 through an intermediate connection.

In the above-mentioned scheme, through connecting the one end of the first side wall 12 of the first case 10 with the fourth side 2122 of the second case 20 to realize the connection of the first case 10 and the second case 20, the connection of the first case 10 and the second case 20 can be realized without providing a flange structure protruding along the second direction Y, thereby improving the space utilization of the battery 100 in the second direction Y, to accommodate more battery cells or reduce the volume of the battery 100, and further improving the volumetric energy density of the battery 100.

Referring to fig. 3 and 5-7, the inner surface of the first sidewall 12 is connected to the fourth side 2122 according to some embodiments of the present application.

The inner surface of the first sidewall 12 may refer to the surface of the first sidewall 12 facing the inside of the battery 100. "the inner surface of the first side wall 12 is connected to the fourth side 2122" may mean that the connection between the inner surface of the first side wall 12 and the fourth side 2122 is a face-to-face connection.

In the above-described aspect, by connecting the inner surface of the first side wall 12 (i.e., the surface of the first side wall 12 facing the fourth side 2122) with the fourth side 2122, the size of the battery 100 in the second direction Y can be effectively reduced to increase the volumetric energy density of the battery 100 as much as possible.

Referring to fig. 3 and 4 and fig. 5-7, according to some embodiments of the present application, the battery 100 further includes a second seal 32, where the second seal 32 is disposed between the first sidewall 12 and the fourth side 2122.

The second seal 32 may be a component having sealing characteristics. In some embodiments, the second seal 32 may be a sealant or gasket.

In some embodiments, the second seal 32 may be pre-attached to the second sidewall 22 by bonding or the like.

The second seal 32 may comprise multiple segments, which may be integrally formed or may be spliced to one another.

In the above-described embodiment, the second seal 32 is provided between the first side wall 12 and the fourth side surface 2122, so that the sealability between the first side wall 12 and the fourth side surface 2122 and, therefore, the sealability of the battery 100 can be improved.

Referring to fig. 3 and 4 and fig. 5-7, according to some embodiments of the present application, the battery 100 further includes a third fastener (not shown), and the first sidewall 12 is connected to the fourth side 2122 by the third fastener.

The third fastener is a connecting member that connects the first side wall 12 and the fourth side 2122, and in some embodiments, the third fastener may be a rivet, screw, bolt, or the like, and in other embodiments, the third fastener may be an adhesive layer disposed between the first side wall 12 and the fourth side 2122.

In the embodiment where the sealing surface is provided with a sealing structure, the third fastener may be penetrating through the sealing structure or may press against the sealing structure.

In the above-mentioned scheme, the first side wall 12 and the fourth side 2122 are connected by the third fastener, so that the first side wall 12 and the fourth side 2122 have higher connection stability, thereby improving the structural stability of the battery 100.

According to some embodiments of the present application, the material density of the first casing 10 is less than the material density of the second casing 20.

The material density is the mass per unit volume of a material in a particular volumetric state.

The material density of the first case 10 is smaller than that of the second case 20, so that the density of the battery 100 is reduced, and the weight of the battery 100 is reduced at the same volume, thereby improving the weight energy density of the battery 100.

In other embodiments, the material density of the first tank 10 may also be equal to or greater than the material density of the second tank 20.

According to some embodiments of the present application, the material of the first case 10 is plastic, and the material of the second case 20 is aluminum alloy.

The cost of the plastic is lower than that of the aluminum alloy, and the density is lower than that of the aluminum alloy. The structural strength and rigidity of the aluminum alloy are higher than those of plastics.

In the above scheme, the first box 10 may be an upper box of the battery 100, the second box 20 may be a lower box of the battery 100, and the second box 20 is made of an aluminum alloy material, so that the second box 20 has higher structural strength and rigidity, and plays a higher role in protecting the battery cell. The first casing 10 serves as an upper casing to close between the battery cells and the upper and lower casings, is made of plastic, and can effectively reduce the manufacturing cost of the battery 100 and effectively reduce the weight of the battery 100 to increase the weight energy density of the battery 100.

In other embodiments, the first case 10 may be made of aluminum, aluminum alloy, steel, stainless steel, or the like. In other embodiments, the second housing 20 may be made of plastic, aluminum, steel, or stainless steel.

According to some embodiments of the present application, the second end wall 21 is used to carry the battery cells.

When assembled, the battery cells may be assembled to the inner surface of the second end wall 21, and the second end wall 21 carrying the battery cells may facilitate positioning of the battery cells.

In the above-mentioned scheme, the second end wall 21 can be used as the assembly matrix when assembling the battery cell, and the assembly of the battery cell is convenient.

There is also provided, in accordance with some embodiments of the present application, an electrical device including the battery 100 described above, the battery 100 being configured to provide electrical energy. In some embodiments, the powered device may be a vehicle 1000, and the type of vehicle 1000 may be a heavy truck or a bus.

Referring to fig. 3-8, according to some embodiments of the present application, there is further provided a battery 100, the battery 100 including a first case 10, a second case 20, and a battery cell. The first case 10 is made of plastic, and the second case 20 is made of aluminum alloy. The first case 10 is an upper case of the battery 100, the second case 20 is a lower case of the battery 100, the second case 20 and the first case 10 are connected to each other to enclose a closed space together, and the battery cells are disposed in the closed space. The first case 10 includes a first end wall 11 and two first side walls 12, the first end wall 11 may be a top wall of the battery 100, and the two first side walls 12 are oppositely disposed to the first end wall 11 in the second direction Y (width direction of the battery 100). The second case 20 includes a second end wall 21 and two second side walls 22, and the second end wall 21 may be a bottom wall of the battery 100. The second end wall 21 may be provided with a plurality of cross members, which may be arranged at intervals along the third direction Z. The cross member may serve to improve the structural strength of the second casing 20, and the battery cell may be connected to the cross member. The two second side walls 22 are oppositely disposed to the second end wall 21 along the third direction Z (the longitudinal direction of the battery 100).

The first end wall 11 and the second end wall 21 are disposed opposite to each other in the first direction X (the height direction of the battery 100). The inner surface of the first side wall 12 is connected to the fourth side 2122.

In the third direction Z, the end of the first end wall 11 is formed with a first flange portion 111 protruding from the inner surface of the first end wall 11, the end of the first side wall 12 is formed with a second flange portion 121 protruding from the inner surface of the first side wall 12, and both the first flange portion 111 and the second flange portion 121 are located on the side of the second side wall 22 facing away from the closed space and are in sealing connection with the second side wall 22.

A first seal 31 and a second seal 32 may be further provided between the first casing 10 and the second casing 20, a portion of the first seal 31 being provided between the first flange portion 111 and the second side wall 22, and another portion of the first seal 31 being provided between the second flange portion 121 and the second side wall 22. The side of the second side wall 22 facing away from the enclosed space is provided with a first groove 221, and the first sealing member 31 is disposed in the first groove 221. The second side wall 22 has a first surface 222 facing away from the enclosed space, a second surface 223 facing toward the enclosed space, and a first side 224 connecting the first surface 222 and the second surface 223. One side in the width direction of the first groove 221 extends to the first side 224. The second end wall 21 has a second side 211 in the third direction Z, and the first surface 222 is flush with the second side 211. The second seal 32 is disposed between the first side wall 12 and the fourth side 2122.

The second end wall 21 comprises a first portion 212 and a second portion 213, the second portion 213 being located on one side of the first portion 212 and being connected to the first portion 212 in the third direction Z. The dimension of the first portion 212 in the second direction Y is greater than the dimension of the second portion 213 in the second direction Y. The first portion 212 has a third side 2121 in the third direction Z, and the bottom surface of the first groove 221 is flush with the third side 2121. The first portion 212 has a fourth side 2122 in the second direction Y, one end of the first side wall 12 is connected to the first end wall 11, the other end of the first side wall 12 is connected to the fourth side 2122, and the fourth side 2122 smoothly transitions with the third side 2121.

The cross member is provided with a mounting portion for mounting the battery 100 on an electric device (e.g., a heavy truck or a bus).

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (18)

1. A battery, comprising:

a battery cell;

the first box body comprises a first end wall and two first side walls, wherein the two first side walls are oppositely arranged along a second direction and are connected with the first end wall;

the second box body comprises a second end wall and two second side walls, the second end wall and the first end wall are oppositely arranged along a first direction, the two second side walls are oppositely arranged along a third direction and are connected with the second end wall, the second box body and the first box body jointly enclose a closed space for accommodating the battery cells, and the first direction, the second direction and the third direction are intersected in pairs;

in the third direction, a first flange part protruding out of the inner surface of the first end wall is formed at the end part of the first end wall, a second flange part protruding out of the inner surface of the first side wall is formed at the end part of the first side wall, and the first flange part and the second flange part are both positioned on one side, away from the closed space, of the second side wall and are in sealing connection with the second side wall.

2. The battery of claim 1, further comprising a first seal, a portion of the first seal disposed between the first flange portion and the second sidewall, and another portion of the first seal disposed between the second flange portion and the second sidewall.

3. The battery of claim 2, wherein a side of the second sidewall facing away from the enclosed space is provided with a first groove, and the first seal is disposed in the first groove.

4. The battery of claim 3, wherein the second sidewall has a first surface facing away from the enclosed space, a second surface facing toward the enclosed space, and a first side connecting the first surface and the second surface;

one side in the width direction of the first groove extends to the first side face.

5. The battery of claim 4, wherein the second end wall has a second side in the third direction, the first surface being flush with the second side.

6. A battery according to claim 3, wherein the second end wall comprises a first portion and a second portion, the second portion being located on one side of the first portion and connected to the first portion in the third direction;

the first portion has a dimension in the second direction that is greater than a dimension of the second portion in the second direction.

7. The battery of claim 6, wherein the first portion has a third side in the third direction, the bottom surface of the first recess being flush with the third side.

8. The battery of claim 7, wherein the first portion has a fourth side in the second direction, one end of the first sidewall is connected to the first end wall, the other end of the first sidewall is connected to the fourth side, and the fourth side smoothly transitions with the third side.

9. The battery of claim 1, further comprising a first fastener and a second fastener, wherein the first flange portion is connected to the second sidewall by the first fastener, and wherein the second flange portion is connected to the second sidewall by the second fastener.

10. The battery of claim 9, wherein the first flange portion is provided with a first through hole, the second sidewall is provided with a first threaded hole, the first fastener passes through the first through hole and is connected to the first threaded hole, the second flange portion is provided with a second through hole, the second sidewall 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.

11. The battery of any one of claims 1-10, wherein the second end wall has a fourth side in the second direction, one end of the first side wall being connected to the first end wall, the other end of the first side wall being connected to the fourth side.

12. The battery of claim 11, wherein an inner surface of the first side wall is connected to the fourth side.

13. The battery of claim 11, further comprising a second seal disposed between the first side wall and the fourth side.

14. The battery of claim 11, further comprising a third fastener, wherein the first side wall is connected to the fourth side by the third fastener.

15. The battery of any one of claims 1-10, wherein the material density of the first case is less than the material density of the second case.

16. The battery of any one of claims 1-10, wherein the material of the first case is plastic and the material of the second case is an aluminum alloy.

17. The battery of any one of claims 1-10, wherein the second end wall is configured to carry the battery cells.

18. An electrical device comprising a battery as claimed in any one of claims 1 to 17 for providing electrical energy.