CN219203382U - Battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery and an electric device. The battery includes: a battery cell; a first housing including a first end wall and a first side wall; the second box body is connected with the first box body to jointly enclose a closed space for accommodating the battery cells, the second box body comprises a second end wall, the second end wall and the first end wall are oppositely arranged along a first direction, the second end wall is provided with a first side face along a second direction, and the first direction is intersected with 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 with the first side face. The technical scheme provided by the application can improve the energy density of the battery.

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

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

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

The present application provides a battery and an electric device, which can improve the energy density of the battery.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery comprising: a battery cell; a first housing including a first end wall and a first side wall; the second box body and the first box body are mutually connected to jointly enclose a closed space for accommodating the battery cells, the second box body comprises a second end wall, the second end wall and the first end wall are oppositely arranged along a first direction, the second end wall is provided with a first side surface in a second direction, and the first direction is intersected with 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 first side wall.

In the above-mentioned scheme, through the one end of the first lateral wall with the first lateral wall of first box be connected with the first lateral wall of second end wall 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 realize the connection of first box and second box to improve the battery 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.

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

In the above scheme, the inner surface of the first side wall, namely the surface facing the first side surface, is connected with the first side surface, so that the size of the battery in the second direction can be effectively reduced, and the volumetric energy density of the battery can be improved as much as possible.

According to some embodiments of the present application, the second end wall has a first surface facing the first end wall, in a direction in which the first end wall points toward the second end wall, an end of the first end wall remote from the first end wall protruding beyond the first surface.

In the above-mentioned scheme, the one end that first side wall was kept away from to first side wall surpasses and can realize that first side wall is directly connected with first side in first surface, on the one hand, can reduce effectively that first side wall passes through intermediate junction spare and first side indirect connection and the assembly degree of difficulty and the manufacturing cost that lead to, on the other hand, first side wall surpasses the internal surface of the part in first surface can be connected with first side, can reduce the size of battery in the second direction effectively to improve the volumetric energy density of battery as far as possible.

According to some embodiments of the present application, the second end wall has a second surface facing away from the first end wall, the first end wall not being beyond the second surface at an end thereof facing away from the first end wall in a direction in which the first end wall is directed toward the second end wall.

In the scheme, one end of the first side wall, which is far away from the first end wall, does not exceed the second surface, so that the size of the battery in the first direction is controlled, and the battery is ensured to have higher volume energy density.

According to some embodiments of the application, the material density of the first tank is less than the material density of the second tank.

In the scheme, the first side wall is connected with the first side wall, so that the proportion of the first box body to the battery is improved, and 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, and the weight of the battery is reduced under the same volume, so that the weight energy density of the battery is improved.

According to some embodiments of the application, the material of the first box is plastic, and the material of the second box is 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.

According to some embodiments of the application, the battery further comprises a first fastener, the first side wall being connected to the first side by the first fastener.

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

According to some embodiments of the application, the first side wall is provided with a first through hole, the first side face 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.

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 side wall and the first side surface, and ensures that the first side wall and the first side surface have good sealing performance.

According to some embodiments of the present application, the battery further comprises a first seal disposed between the first sidewall and the first side.

In the above scheme, the first sealing member is arranged in front of the first side wall and the first side face, so that the sealing performance between the first side wall and the first side face can be improved, and the sealing performance of the battery is further improved.

According to some embodiments of the present application, the number of the first side walls is two, and the two first side walls are oppositely disposed along the second direction; the second end wall is positioned between the two first side walls, and the second end wall is provided with two first side surfaces which are oppositely arranged along the second direction; the first side surfaces are in one-to-one correspondence with the first side walls.

In the above scheme, the quantity of the first side walls is two and is relatively arranged along the second direction, and the first side walls are respectively connected with the corresponding first side walls, so that the space utilization rate of the battery in the second direction can be effectively improved, and the volume energy density of the battery is further improved.

According to some embodiments of the application, the second case further includes two second side walls, the two second side walls are disposed opposite to each other along the second direction and connected to the second end wall, and the battery cell is disposed between the two second side walls.

In the above-mentioned scheme, along the second direction, set up two relative second lateral walls on the second end wall, on the one hand, can improve the structural strength of second box, on the other hand can inject the free installation zone of battery for the battery monomer is assembled in the second box steadily, on the other hand, owing to the second lateral wall protrusion in the surface of second end wall, so when the battery monomer passes through glue bonding in the second box, can control the excessive gluey space effectively, reduce the risk of wasting and polluting the environment because of glue overflows.

According to some embodiments of the present application, openings are formed at two ends of the first box along the third direction respectively; the second box body further comprises two third side walls, the two third side walls are oppositely arranged along the third direction and connected with 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 are intersected in pairs.

In the scheme, by arranging the third side wall, on one hand, components such as an explosion-proof valve, a water-cooling connector or a high-low voltage connector and the like can be arranged on the third side wall, so that the normal charge and discharge operation of the battery is ensured; on the other hand, relative set up in along the convex flange structure of third direction between first box and second box, through setting up the third lateral wall in order to seal the opening, can improve the space utilization of battery in the third direction, improve the volumetric energy density of battery.

According to some embodiments of the present application, the third sidewall includes a third surface facing the enclosed space, a fourth surface facing away from the enclosed space, and a second side connecting the third surface and the fourth surface; the first box body comprises two connecting parts, the two connecting parts are respectively positioned at two ends of the first box body along the third direction, the connecting parts enclose the opening, and the connecting parts are connected to the second side face.

In the above scheme, the connecting part is arranged to be connected with the second side face of the third side wall, so that the connection stability system and the tightness of the first box body and the second box body can be ensured.

According to some embodiments of the present application, the second side surface includes a first straight surface, a second straight surface and a transition surface, the first straight surface is disposed at one end of the third side wall facing away from the second end wall, two second straight surfaces are disposed at two ends of the third side wall along the second direction, respectively, and the transition surface is connected with the first straight surface and the second straight surface, so that the first straight surface and the second straight surface are in smooth transition.

In the scheme, the first straight surface and the second straight surface are non-coplanar surfaces, so that the first straight surface and the second straight surface are smoothly transited by arranging the transition surface, a good sealing surface can be formed between the connecting part and the second side surface, and the battery has higher tightness.

According to some embodiments of the application, the second straight face is flush with the first side face.

In the scheme, the second straight surface is flush with the first side surface, so that the risk of generating a gap between the first side wall and the second side surface can be reduced, the risk of generating a gap between the connecting part and the second straight surface is reduced, and the tightness of the battery is further improved.

According to some embodiments of the present application, the first case further comprises a fourth sidewall adjacent to the first sidewall; one end of the fourth side wall is connected with the first end wall, the connecting part is arranged at the other end of the fourth side wall, and the connecting part protrudes out of the fourth side wall towards the direction deviating from the closed space.

In the above scheme, the first box body can be an upper box body, the second box body can be a lower box body, and in the manufacturing process of the battery, the material cost and the density of the upper box body can be lower than those of the lower box body.

According to some embodiments of the application, the battery further comprises a second fastener, the connecting portion being connected to the second side face by the second fastener.

In the scheme, the second side face and the connecting part are connected through the second fastener, so that the connection stability between the connecting part and the second side face is improved, and the structural stability of the battery is improved.

According to some embodiments of the application, the connecting portion is provided with a second through hole, the second side 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 second fastener can be a connecting part with external threads such as a bolt, a screw and the like, can be effectively connected in the second threaded hole, improves the connection stability between the connecting part and the second side surface, and ensures that the connecting part and the second side surface have good sealing performance.

According to some embodiments of the application, the battery further comprises a second seal disposed between the connection and the second side.

In the above-mentioned scheme, through setting up the second sealing member between connecting portion and second side, can improve the leakproofness between connecting portion wall and the second side, and then improve the leakproofness of battery.

According to some embodiments of the present application, the battery further comprises a first seal disposed between the first sidewall and the first side; wherein, the both ends of first sealing member are connected respectively in two second sealing member.

In the above scheme, the first sealing member and the second sealing member can be integrally formed or can be formed by split connection. Through setting up first sealing member and second sealing member, can make to have good leakproofness between first box and the second box, improve the security of battery.

According to some embodiments of the application, a dimension of one of the third sidewalls in the first direction is smaller than a dimension of the other of the third sidewalls in the first direction.

In the scheme, the third side wall with larger size can be provided with components such as an explosion-proof valve, a water-cooled connector or a high-low voltage connector, so that normal charge and discharge operation of the battery is ensured; by reducing the size of the other third side wall, the size of the first box corresponding to the third side wall part can be adaptively increased, the proportion of the first box to the battery is increased (in this embodiment, the first box may be an upper box with lower material cost and density), and thus the manufacturing cost of the battery is reduced, and the weight energy density of the battery is increased.

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

In the scheme, the mounting part is arranged on the second end wall so as to realize stable assembly of the battery and ensure that the battery provides electric energy.

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 only 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 the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic diagram of a battery in some embodiments of the present application;

FIG. 3 is an exploded perspective view of a battery in some embodiments of the present application;

FIG. 4 is a schematic view of a first housing according to some embodiments of the present application;

FIG. 5 is a schematic view of a second housing according to some embodiments of the present application;

FIG. 6 is an enlarged view at A in FIG. 5;

FIG. 7 is a partial schematic view of a first housing according to some embodiments of the present application;

FIG. 8 is a schematic view of a third sidewall in some embodiments of the present application;

FIG. 9 is a partial schematic view of a first housing according to further embodiments of the present application;

FIG. 10 is a partial schematic view of a second housing according to further embodiments of the present application;

fig. 11 is a schematic view of a second case according to other embodiments of the present application.

Icon: 100-cell; 1000-vehicle; 200-a controller; 300-motor; 10-a first box body; 11-a first end wall; 12-a first sidewall; 120-a first through hole; 13-opening; 14-connecting part; 140-a second through hole; 15-fourth side wall; 20-a second box; 21-a second end wall; 210-a first side; 2100-a first threaded bore; 211-a first surface; 212-a second surface; 22-a second sidewall; 23-a third sidewall; 230-a third surface; 231-fourth surface; 232-a second side; 2320-a first plane; 2321-a second plane; 2322-transition surfaces; 2323-a second threaded hole; 24-a cross beam; 30-a first seal; 31-a second seal; 40-mounting part; z-a first direction; x-a second direction; y-third direction.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

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 "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

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 "length", "width", "thickness", "upper", "lower", 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 simplifying the description, rather than indicating or implying that the apparatus or element in question 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, for example, be fixedly connected, detachably connected, or be integrated; 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. The battery also comprises a first box body and a second box body, wherein the first box body and the second box body are connected to jointly enclose a closed space, and the battery monomer is arranged in the closed space so as to avoid liquid or other foreign matters from affecting the charging or discharging of the battery monomer.

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. The inventor finds that the edges of the first box body and the second box body of the battery at present are provided with flange structures protruding towards the outer side of the battery, and the first box body and the second box body are connected with each other through the flange structures to realize sealing connection, however, the protruding flange structures occupy extra space, so that the space utilization rate of the battery is low, and the volume energy density of the battery is influenced.

In view of this, in order to solve the problem that the battery space utilization is low and the battery energy density is affected due to the additional space occupied by the protruding flange structure, the inventors have intensively studied to design a battery including a first case including a first end wall and a first side wall and a second case. The second case includes a second end wall, the first end wall and the second end wall being disposed opposite each other in a first direction, the second end wall having a first side in a second direction, the first direction intersecting the second direction. The first side of the first housing is connected to the first side of the second end wall.

In the above-mentioned scheme, the battery has cancelled outside convex flange structure for first side wall is connected with first side, saves because of the extravagant space of flange structure, improves the space utilization of battery in the second direction, in order to hold more battery monomer or reduce the volume of battery, and then improves the volumetric energy density of battery.

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, a mobile phone, a tablet personal computer, a notebook personal computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a heavy truck, a bus, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and 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 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.

According to some embodiments of the present application, a battery 100 is provided, please refer to fig. 2-6, fig. 2 is a schematic diagram of the battery in some embodiments of the present application, fig. 3 is an exploded perspective view of the battery 100 in some embodiments of the present application, fig. 4 is a schematic diagram of the first case 10 in some embodiments of the present application, fig. 5 is a schematic diagram of the second case 20 in some embodiments of the present application, and fig. 6 is an enlarged view at a in fig. 5.

The battery 100 includes a battery cell (not shown), a first case 10, and a second case 20. The first casing 10 includes a first end wall 11 and a first side wall 12. The second casing 20 and the first casing 10 are connected to each other to collectively enclose a closed space for accommodating the battery cells, the second casing 20 includes a second end wall 21, the second end wall 21 is disposed opposite to the first end wall 11 in a first direction z, the second end wall 21 has a first side 210 in a second direction x, and the first direction z intersects the second direction x. Wherein 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 wall 210.

In some embodiments, first case 10 may be regarded as an upper case of battery 100, first end wall 11 may be regarded as 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 being in the same plane as first end wall 11; the first sidewall 12 may be connected to the first end wall 11 by welding or bonding.

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, the first direction z 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, and the first side 210 may be a surface of the bottom wall in the second direction x. 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 first direction z intersects the second direction x, which may mean that the first direction z and the second direction x are not parallel, and correspondingly, the first side 210 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.

"one end of the first sidewall 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 sidewall 12 connects the first end wall 11 and the second end wall 21 to each other, and one end of the first sidewall 12 remote from the first end wall 11 is directly or indirectly connected to the first side surface 210, which may be understood as that the connection surface of the first sidewall 12 and the first end wall 11 is located at the first side surface 210 without protruding from the external contours of the first case 10 and the second case 20 in the second direction x. "the end of the first side wall 12 remote 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 that the first side wall 12 is indirectly connected to the first side surface 210 through an intermediate connection member.

In the above-mentioned scheme, through connecting one end of the first side wall 12 of the first case 10 with the first side 210 of the second end wall 21 to realize connection of the first case 10 and the second case 20, connection of the first case 10 and the second case 20 can be realized without providing a flange structure protruding along the second direction x, thereby improving the space utilization of the battery 100 in the second direction x, so as to accommodate more battery cells or reduce the volume of the battery, and further improving the volumetric energy density of the battery 100.

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

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 sidewall 12 is connected to the first side 210" may refer to the connection between the inner surface of the first sidewall 12 and the first side 210 as a facial connection.

In the above-described scheme, by connecting the inner surface of the first side wall 12, i.e., the surface facing the first side surface 210, with the first side surface 210, the size of the battery 100 in the second direction x can be effectively reduced to increase the volumetric energy density of the battery 100 as much as possible.

According to some embodiments of the present application, as shown in fig. 5 and 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 remote from the first end wall 11 extends beyond the first surface 211 in a direction in which the first end wall 11 points toward the second end wall 21.

The second end wall 21 has a first surface 211 in the first direction z, the first surface 211 being the surface of the second end wall 21 facing the first end wall 11. The first surface 211 may be considered as an upper surface of the second end wall 21. In some embodiments, the battery cell is located between the first surface 211 and the first end wall 11.

"in the direction in which the first end wall 11 points toward the second end wall 21, the end of the first side wall 12 away from the first end wall 11 exceeds the first surface 211" may mean that the orthographic projection of the first side wall 12 on the plane of the first side surface 210 overlaps 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.

In the above-mentioned scheme, the end of the first side wall 12 far away from the first end plate is beyond the first surface 211 to directly connect the first side wall 12 with the first side surface 210, on one hand, the improvement of assembly difficulty and manufacturing cost caused by indirect connection of the first side wall 12 with the first side surface 210 through the intermediate connecting piece can be effectively reduced, and on the other hand, the inner surface of the portion of the first end wall 11 beyond the first surface 211 can be connected with the first side surface 210, so that the size of the battery 100 in the second direction x can be effectively reduced to increase the volumetric energy density of the battery 100 as much as possible.

According to some embodiments of the present application, as shown in fig. 5 and 6, the second end wall 21 has a second surface 212 facing away from the first end wall 11, and the end of the first side wall 12 facing away from the first end wall 11 does not protrude beyond the second surface 212 in a direction in which the first end wall 11 points towards the second end wall 21.

The second end wall 21 has a second surface 212 in the first direction z, the second surface 212 being the surface of the second end wall 21 facing away from the first end wall 11. The second surface 212 may be considered a lower surface of the second end wall 21.

"in the direction in which the first end wall 11 points toward the second end wall 21, the end of the first side wall 12 remote from the first end wall 11 does not exceed the second surface 212" may refer to a position in which the end of the first side wall 12 remote from the first end wall 11 is flush with the second surface 212 or between the second surface 212 and the first end wall 11.

In the above-mentioned solution, the end of the first sidewall 12 remote from the first sidewall 11 does not exceed the second surface 212, so that the dimension of the battery 100 in the first direction z is controlled, and a higher volumetric energy density of the battery 100 is ensured.

In some embodiments, as shown in fig. 3, the second direction x is the width direction of the battery 100. The battery 100 may be a prismatic 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, i.e., the direction in which the first end wall 11 and the second end wall 21 are opposite. The width direction and the length direction of the battery 100 may be directions perpendicular to each other and 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, and in some embodiments, the side of the battery 100 in the width direction is the larger area, i.e., the large face, of the battery 100. The first case 10 may be an upper case of the battery 100, and in the manufacturing process of the battery 100, both the material cost and the density of the upper case may be lower than those of the lower case, and therefore, when the second direction x is the width direction of the battery 100, the first sidewall 12 may be regarded as a large surface (a surface having a large area) of the battery 100, so that the material cost of the battery 100 can be greatly reduced to reduce the manufacturing cost of the battery 100, and the weight of the battery 100 can be greatly reduced to improve the weight energy density 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.

In the above-mentioned scheme, since the first side wall 12 is connected with the first side 210, the proportion of the first case 10 in the battery 100 is improved, and 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 under the same volume, so that the weight energy density of the battery is improved.

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 can be the last box of battery 100, and the second box 20 can be the lower box of battery 100, and the second box 20 is made for aluminum alloy material for the second box 20 has high structural strength and rigidity, plays strong guard action to the battery monomer, and first box 10 plays the effect between sealed battery monomer and the upper and lower box as last box, and it is through plastics preparation, can effectively reduce battery 100's manufacturing cost, and can effectively reduce battery 100's weight in order to improve battery 100's weight energy density.

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, battery 100 further includes a first fastener (not shown), by which first sidewall 12 is connected to first side 210.

The first fastener is a connecting portion 14 connecting the first side wall 12 and the first side 210, and in some embodiments, the first fastener may be a rivet, screw, bolt, or the like, and in other embodiments, the first fastener may be an adhesive layer disposed between the first side wall 12 and the first side 210.

In the above-mentioned scheme, the first side wall 12 and the first side 210 are connected by the first fastener to ensure the connection stability of the first side wall 12 and the first side 210, and the structural stability of the battery 100 is ensured.

Referring to fig. 6 and 7, fig. 7 is a schematic partial view of the first case 10 according to some embodiments of the present application. The first sidewall 12 is provided with a first through hole 120, the first side 210 is provided with a first screw hole 2100, and a first fastener passes through the first through hole 120 and is connected to the first screw hole 2100.

The first through-hole 120 may refer to a hole-like structure penetrating the outer and inner surfaces of the first sidewall 12. "the first side 210 is provided with the first screw hole 2100", which may refer to a hole-like structure having internal screw threads, such as self-tapping screw threads, formed at the first side 210; or may refer to a threaded bore of a blind rivet nut or a threaded bore of a clinch nut disposed on the first side 210. Referring to fig. 6 and fig. 7, the number of the first through holes 120 may be plural, and the plural first through holes 120 are arranged at intervals along the extending direction of the first sidewall 12 (the extending direction of the first sidewall 12 is perpendicular to the first direction z and the second direction x); the number of the first screw holes 2100 is also plural, and the first screw holes 2100 are provided corresponding to the first through holes 120.

"the first fastener passes through the first through hole 120 and is coupled to the first threaded hole 2100" may mean that the first fastener has external threads that mate with the first threaded hole 2100 to be capable of being threadedly coupled with the first threaded hole 2100.

In the above-mentioned scheme, the first fastener may be a connecting part 14 with external threads, such as a bolt, a screw, etc., and can be effectively connected in the first threaded hole 2100, so that the first side wall 12 and the first side 210 have high connection stability and good tightness between the first side wall 12 and the first side 210.

According to some embodiments of the present application, as in fig. 3, the battery 100 further includes a first seal 30, the first seal 30 being disposed between the first side wall 12 and the first side 210.

The first seal 30 may be a component having sealing characteristics and disposed between the first side wall 12 and the first side 210. In some embodiments, the first seal 30 may be a sealant or gasket, with the first seal 30 sandwiched between the first side wall 12 and the first side 210.

In the above-described embodiments, the first seal 30 is provided before the first side wall 12 and the first side surface 210, so that the sealability between the first side wall 12 and the first side surface 210 can be improved, and the sealability of the battery 100 can be improved.

According to some embodiments of the present application, as shown in fig. 3, 4 and 7, the number of first side walls 12 is two, and two first side walls 12 are oppositely disposed along the second direction x. The second end wall 21 is located between the two first side walls 12, the second end wall 21 having two first side surfaces 210 disposed opposite in the second direction x. The first side 210 and the first side wall 12 are in one-to-one correspondence.

In some embodiments, the number of first side walls 12 is two, the two first side walls 12 being oppositely disposed along the second direction x to correspond to the two first sides 210 of the second end wall 21 oppositely disposed in the second direction x. The second end wall 21 is located between the two first side walls 12, and it is understood that the outer contour of the battery 100 in the second direction x is defined by the two first side walls 12.

In the above-mentioned scheme, the number of the first side walls 12 is two and are oppositely arranged along the second direction x, and are respectively connected with the corresponding first side surfaces 210, so that the space utilization rate of the battery 100 in the second direction x can be effectively improved, and the volumetric energy density of the battery 100 can be further improved.

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

According to some embodiments of the present application, as shown in fig. 6, the second case 20 further includes two second side walls 22, the two second side walls 22 are disposed opposite to each other along the second direction x and connected to the second end wall 21, and the battery cell is disposed between the two second side walls 22.

The second side wall 22 is a member provided to the second end wall 21. The second side wall 22 may be provided to the second end wall 21 by welding or bonding. The second end wall 21 has a first surface 211 facing the first end wall 11, and the second side wall 22 protrudes from the first surface 211 in a direction in which the second end wall 21 points toward the first end wall 11.

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

In the above-mentioned scheme, along second direction x, set up two relative second lateral walls 22 on second end wall 21, on the one hand, can improve the structural strength of second box 20, on the other hand, can inject the free installation zone of battery for the battery monomer is assembled in second box 20 in order, on the other hand, owing to second lateral wall 22 protrusion in the surface of second end wall 21, so when the battery monomer passes through glue bonding in second box 20, can effectually control the excessive gluey space, reduce the risk of wasting and polluting the environment because of glue overflows.

According to some embodiments of the present application, please refer to fig. 4 and 7. The first casing 10 is formed with openings 13 at both ends thereof in the third direction y, respectively. Please refer to fig. 5. The second casing 20 further includes two third side walls 23, the two third side walls 23 being disposed opposite to each other along the third direction y and connected to the second end wall 21, and the two third side walls 23 closing the two openings 13, respectively. The first direction z, the second direction x and the third direction y intersect each other two by two.

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.

The third side wall 23 is a member provided to the second end wall 21. The third side wall 23 may be attached to the second end wall 21 by welding or adhesive means. The second end wall 21 has a first surface 211 facing the first end wall 11, and the third side wall 23 protrudes from the first surface 211 in a direction of the second end wall 21 toward the first end wall 11. The third side wall 23 may provide structural strength of the first case 10, and in some embodiments, the third side wall 23 may be provided with an explosion-proof valve, a water-cooled connector, or a high-low voltage connector, etc., to ensure normal charge and discharge operations of the battery 100.

The openings 13 formed at two ends of the first case 10 along the third direction y may be notch-shaped portions corresponding to the third side wall 23, and the third side wall 23 may correspondingly close the openings 13, so as to avoid the battery 100 from generating additional portions that interfere or overlap with each other, so as to improve the utilization ratio of the manufacturing materials of the battery 100, and ensure that the battery 100 has lower manufacturing cost; meanwhile, the battery 100 is prevented from generating additional interference or overlapping parts to cause space waste. In some embodiments, the cross-section of the first tank 10 may be U-shaped in shape.

In the above scheme, by arranging the third side wall 23, on one hand, components such as an explosion-proof valve, a water-cooled connector or a high-low voltage connector can be installed on the third side wall 23, so as to ensure the normal charge and discharge operation of the battery 100; on the other hand, 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 and the volumetric energy density of the battery 100 can be improved, as compared to the flange structure provided between the first casing 10 and the second casing 20 to protrude in the third direction y.

Referring to fig. 7 and 8, fig. 8 is a schematic view of a third sidewall 23 according to some embodiments of the present application. The third side wall 23 comprises a third surface 230 facing the enclosed space, a fourth surface 231 facing away from the enclosed space, and a second side 232 connecting the third surface 230 and the fourth surface 231; the first box 10 includes two connecting portions 14, the two connecting portions 14 are respectively located at two ends of the first box 10 along the third direction y, the connecting portions 14 enclose an opening 13, and the connecting portions 14 are connected to the second side 232.

The third surface 230 may be an inner surface of the third sidewall 23, the fourth surface 231 may be an outer surface of the third sidewall 23, and the second side 232 may be an outer circumferential surface of the third sidewall 23 between the inner surface and the outer surface. The outer circumferential 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.

The connecting portion 14 is a member located at an end portion of the first casing 10 in the third direction y, and encloses the opening 13 of the first casing 10, and the contour of the connecting portion 14 is fitted to the second side surface 232 of the third side wall 23.

"the connection portion 14 is connected to the second side 232" may mean that the first casing 10 and the second casing 20 are connected to each other by the connection portion 14 and the second side 232 in the third direction y.

Referring to fig. 7, the connection portion 14 may have a sheet shape, which is engaged with the second side 232. In some embodiments, the connection between the connection portion 14 and the second side 232 is a face-to-face connection.

In the above-described configuration, the connection portion 14 is provided to be connected to the second side surface 232 of the third side wall 23, so that the connection stability and the sealing property between the first casing 10 and the second casing 20 can be improved.

According to some embodiments of the present application, referring to fig. 8, second side 232 includes a first straight surface 2320, a second straight surface 2321, and a transition surface 2322. The first straight surface 2320 is disposed at one end of the third sidewall 23 facing away from the second end wall 21, and two second straight surfaces 2321 are respectively disposed at two ends of the third sidewall 23 along the second direction x, and the transition surface 2322 connects the first straight surface 2320 and the second straight surface 2321, so that the first straight surface 2320 and the second straight surface 2321 are smoothly transitioned.

The first straight surface 2320 may be an upper surface of the third sidewall 23, which may be a flat surface. The second plane 2321 may be an outer side of the third side, which may be a flat surface. In some embodiments, first plane 2320 and second plane 2321 are perpendicular to each other. Transition surface 2322 is a portion connecting first planar surface 2320 and second planar surface 2321, which enables smooth transition of first planar surface 2320 and second planar surface 2321. A smooth transition may refer to a relationship in which first straight plane 2320 and second straight plane 2321 are non-right angle transitions.

In some embodiments, transition surface 2322 may be a cambered surface or a beveled surface.

In the above-mentioned scheme, the first plane 2320 and the second plane 2321 are non-coplanar surfaces, so by providing the transition surface 2322 so that the first plane 2320 and the second plane 2321 are smoothly transitioned, a good sealing surface can be formed between the connection portion 14 and the second side 232, and the tightness of the battery 100 is ensured.

According to some embodiments of the present application, referring to fig. 8, second straight plane 2321 is flush with first side 210.

The second plane 2321 is flush with the first side 210, which may mean that an outer side of the third sidewall 23 in the second direction x is flush with an outer side of the second end wall 21 in the second direction x, that is, a plane of the second case 20 in the second direction x is a flat plane.

In the above-mentioned scheme, the second plane 2321 is flush with the first side 210, so that the risk of generating a gap between the first side wall 12 and the second side 232 can be reduced, the risk of generating a gap between the connecting portion 14 and the second plane 2321 can be reduced, and the tightness of the battery 100 can be further improved.

Referring to fig. 9 and 10, fig. 9 is a schematic partial view of the first casing 10 according to other embodiments of the present application, and fig. 10 is a schematic partial view of the second casing 20 according to other embodiments of the present application. The first container 10 further includes a fourth sidewall 15, the fourth sidewall 15 being adjacent to the first sidewall 12. One end of the fourth side wall 15 is connected to the first end wall 11, and the connecting portion 14 is provided at the other end of the fourth side wall 15, and the connecting portion 14 protrudes from the fourth side wall 15 in a direction away from the closed space.

The first end wall 11 has a lower surface facing the second end wall 21, the fourth side wall 15 is a member protruding from the lower surface and adjacent to the first side wall 12, and the fourth side wall 15 may be welded or bonded to the first end wall 11. When the first casing 10 has two first side walls 12 disposed opposite to each other in the second direction x, the fourth side wall 15 is disposed between the two first side walls 12, one end of the fourth side wall 15 is connected to the first end wall 11, and opposite ends of the fourth side wall 15 in the second direction x are respectively connected to the two first side walls 12.

The connecting portion 14 may be protruded 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.

In some embodiments, in combination with fig. 10, by providing the fourth sidewall 15, the size of the third sidewall 23 in the first direction z can be reduced, i.e., the larger the size of the fourth sidewall 15 in the first direction z, the smaller the size of the third sidewall 23 in the first direction z can be.

In the above-mentioned scheme, the first case 10 may be an upper case, the second case 20 may be a lower case, and in the manufacturing process of the battery 100, the material cost and density of the upper case may be lower than those of the lower case, so that the fourth side wall 15 is provided to increase the duty ratio of the first case 10 in the battery 100, thereby effectively reducing the manufacturing cost of the battery 100 and increasing the weight energy density of the battery 100.

In some embodiments, the fourth side wall 15 may be sized larger in the first direction z, and components such as an explosion-proof valve, a water-cooled connector, or a high-low pressure connector may be mounted on the fourth side wall 15.

According to some embodiments of the present application, battery 100 further includes a second fastener (not shown), by which connecting portion 14 is connected to second side 232.

The second fastener is a connecting portion 14 connecting the two side surfaces and the connecting portion 14, 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 an adhesive layer disposed between the connecting portion 14 and the second side surface 232.

In the above-described aspects, the second side 232 and the connection part 14 are connected by providing the second fastener to improve the connection stability between the connection part 14 and the second side 232, thereby improving the structural stability of the battery 100.

According to some embodiments of the present application, fig. 7 and 8. The connection portion 14 is provided with a second through hole 140, the second side 232 is provided with a second threaded hole 2323, and a second fastener passes through the second through hole 140 and is connected to the second threaded hole 2323.

The second through holes 140 may refer to a hole-like structure penetrating the outer and inner surfaces of the connection part 14. The "second side 232 is provided with the second threaded hole 2323", which may refer to a hole-like structure having internal threads, such as self-tapping threads, formed at the second side 232; or may refer to a blind rivet nut or a clinch nut disposed on the second side 232. Referring to fig. 7 and 8, the number of the second through holes 140 may be plural, and the plural second through holes 140 are arranged at intervals; the number of the second screw holes 2323 is also plural, and the first screw holes 2100 are provided corresponding to the first through holes 120.

"the second fastener passes through the second through hole 140 and is coupled to the second threaded hole 2323" may mean that the second fastener has external threads that mate with the second threaded hole 2323 to be capable of being threadedly coupled with the second threaded hole 2323.

In the above-mentioned scheme, the second fastener may be a connecting portion 14 member having external threads, such as a bolt, a screw, etc., and may be effectively connected to the second threaded hole 2323, so as to improve the connection stability between the connecting portion 14 and the second side 232, and make the connecting portion 14 and the second side 232 have good tightness.

According to some embodiments of the present application, referring to fig. 3, the battery 100 further includes a second seal 31, the second seal 31 being disposed between the connection portion 14 and the second side 232.

The second seal 31 may be a member having sealing characteristics and disposed between the connection portion 14 and the second side 232. In some embodiments, the second seal 31 may be a sealant or gasket, with the second seal 31 sandwiched between the first straight face 2320 and the connection 14, between the second straight face 2321 and the connection 14, and between the transition face 2322 and the connection 14.

In the above-described embodiment, the second seal 31 is provided between the connecting portion 14 and the second side surface 232, so that the sealing property between the wall of the connecting portion 14 and the second side surface 232 can be improved, and the sealing property of the battery 100 can be further improved.

Referring to fig. 3, according to some embodiments of the present application, the battery 100 further includes a first seal 30, the first seal 30 being disposed between the first side wall 12 and the first side 210. Wherein both ends of the first sealing member 30 are connected to two second sealing members 31, respectively.

In fig. 3, the first sealing member 30 corresponds to a position of the connection portion 14 between the first side 210 and the first side wall 12, which may extend along the length direction of the battery 100, and the second sealing member 31 corresponds to a position of the connection portion 14 between the second side 232 and the connection portion 14, which includes a portion extending in the width direction of the battery 100, a portion extending in the height direction of the battery 100, and a portion corresponding to the transition surface 2322.

In some embodiments, the first seal member 30 and the second seal member 31 may be independent structures, and the first seal member 30 and the second seal member 31 are connected by adhesion or an intermediate connection member. In other embodiments, the first seal 30 and the second seal 31 may be of unitary construction.

In the above-mentioned embodiments, the first seal member 30 and the second seal member 31 may be integrally formed, or may be formed by separately connecting them. By providing the first seal member 30 and the second seal member 31, good sealing performance can be provided between the first casing 10 and the second casing 20, and the safety of the battery can be improved.

Referring to fig. 11, fig. 11 is a schematic view of a second housing 20 according to other embodiments of the present application. The dimension of one of the third side walls 23 in the first direction z is smaller than the dimension of the other third side wall 23 in the first direction z.

The dimension of the third sidewall 23 in the first direction z can be regarded as the height of the third sidewall 23. "the dimension of one of the third side walls 23 in the first direction z is smaller than the dimension of the other third side wall 23 in the first direction z" may mean that one of the third side walls 23 is higher and the other third side wall 23 is lower. Since the heights of the two third side walls 23 are different, the resulting height difference can be compensated for by the first casing 10.

In the above scheme, the third side wall 23 with larger size can be provided with components such as an explosion-proof valve, a water-cooled connector or a high-low voltage connector, so as to ensure the normal charge and discharge operation of the battery 100; by reducing the size of the other third side wall 23, the size of the first case 10 corresponding to the third side wall 23 can be adaptively increased, the proportion of the first case 10 to the battery 100 is increased (in this embodiment, the first case 10 may be an upper case with lower material cost and density), and thus the manufacturing cost of the battery 100 is reduced, and the gravimetric energy density of the battery 100 is increased.

According to some embodiments of the present application, as shown in fig. 3 and 5, the second end wall 21 is provided with a mounting portion 40 for mounting the battery 100 on an electric device.

The mounting portion 40 is a member provided on the second end wall 21 for mounting the battery 100 on the electric device. The mounting portion 40 may be a connection structure such as a nut or a connection bracket provided on the second end wall 21. In some embodiments, the number of mounting portions 40 may be plural, which may be arranged in the third direction y and the second direction x. In some embodiments, mounting portion 40 may be a threaded bore structure of M8, M10, M12, M16 disposed on second end wall 21.

In the above-mentioned scheme, the mounting portion 40 is provided on the second end wall 21 to realize stable assembly of the battery 100, so as to ensure that the battery 100 provides electric energy.

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, which may be of the heavy truck or bus type.

According to some embodiments of the present application, the present application also provides a battery 100, see fig. 3-8. The battery 100 includes a first case 10, a second case 20, and battery cells. 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, two first side walls 12, and two connecting portions 14, the first end wall 11 may be a top wall of the battery 100, and the two first side walls 12 are oppositely disposed on the first end wall 11 along the second direction x (the width direction of the battery 100). Two connection portions 14 are respectively located at both ends of the first casing 10 in the third direction y (the longitudinal direction of the battery 100), and the connection portions 14 enclose the opening 13. The second case 20 includes a second end wall 21 and two second side walls 22, the second end wall 21 may be a bottom wall of the battery 100, and the second end wall 21 has two first surfaces 211 oppositely disposed in the second direction x. The second end wall 21 may be provided with a plurality of cross members 24, and the plurality of cross members 24 may be arranged at intervals along the third direction y. The cross member 24 may serve to increase the structural strength of the second housing 20, and the battery cells may be connected to the cross member 24. The two second side walls 22 are oppositely disposed to the second end wall 21 along the third direction y (the longitudinal direction of the battery 100), and the second side walls 22 have a first straight surface 2320 facing the first end wall 11, two second straight surfaces 2321 oppositely disposed along the second direction x, and a transition surface 2322 connecting the first straight surface 2320 and the second straight surfaces 2321.

The first end wall 11 and the second end wall 21 are disposed opposite to each other in the 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 210, a first seal 30 is provided between the first side wall 12 and the first side 210, and the first side wall 12 is connected to the second side 232 by a first fastener. The second sidewall 22 corresponds to the connection portion 14, and a second sealing member 31 is disposed between the second sidewall 22 and the connection portion 14, and the first flat surface 2320, the second flat surface 2321, and the transition surface 2322 are all connected to the connection portion 14 by a second fastener.

The cross member 24 is provided with a mounting portion 40 for mounting the battery 100 on an electric device (e.g., a heavy truck or a bus).

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (23)

1. A battery, comprising:

a battery cell;

a first housing including a first end wall and a first side wall;

the second box body and the first box body are mutually connected to jointly enclose a closed space for accommodating the battery cells, the second box body comprises a second end wall, the second end wall and the first end wall are oppositely arranged along a first direction, the second end wall is provided with a first side surface in a second direction, and the first direction is intersected with 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 first side wall.

2. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the inner surface of the first side wall is connected with the first side surface.

3. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the second end wall has a first surface facing the first end wall, and an end of the first end wall remote from the first end wall extends beyond the first surface in a direction in which the first end wall points toward the second end wall.

4. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the second end wall has a second surface facing away from the first end wall, the first end wall being directed toward the second end wall, and the first end wall being remote from the first end wall by an amount not exceeding the second surface.

5. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the material density of the first box body is smaller than that of the second box body.

6. The battery of claim 5, wherein the battery is configured to provide the battery with a battery cell,

the first box body is made of plastic, and the second box body is made of aluminum alloy.

7. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

The battery also includes a first fastener by which the first side wall is connected to the first side.

8. The battery of claim 7, wherein the battery is configured to provide the battery with a battery cell,

the first side wall is provided with a first through hole, the first side face is provided with a first threaded hole, and the first fastener penetrates through the first through hole and is connected to the first threaded hole.

9. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the battery also includes a first seal disposed between the first sidewall and the first side.

10. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the number of the first side walls is two, and the two first side walls are oppositely arranged along the second direction; the second end wall is positioned between the two first side walls, and the second end wall is provided with two first side surfaces which are oppositely arranged along the second direction; the first side surfaces are in one-to-one correspondence with the first side walls.

11. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

the second box body further comprises two second side walls, the two second side walls are oppositely arranged along the second direction and connected with the second end wall, and the battery unit is arranged between the two second side walls.

12. The battery of claim 1, wherein the battery is configured to provide the battery with a plurality of cells,

openings are formed at two ends of the first box body along the third direction respectively;

the second box body further comprises two third side walls, the two third side walls are oppositely arranged along the third direction and connected with 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 are intersected in pairs.

13. The battery of claim 12, wherein the battery is configured to provide the battery with a plurality of cells,

the third side wall includes a third surface facing the enclosed space, a fourth surface facing away from the enclosed space, and a second side connecting the third surface and the fourth surface;

the first box body comprises two connecting parts, the two connecting parts are respectively positioned at two ends of the first box body along the third direction, the connecting parts enclose the opening, and the connecting parts are connected to the second side face.

14. The battery of claim 13, wherein the battery is configured to provide the battery with a plurality of cells,

the second side surface comprises a first straight surface, a second straight surface and a transition surface, the first straight surface is arranged at one end of the third side wall, which is far away from the second end wall, the two second straight surfaces are respectively arranged at two ends of the third side wall along the second direction, and the transition surface is connected with the first straight surface and the second straight surface, so that the first straight surface and the second straight surface are in smooth transition.

15. The battery of claim 14, wherein the battery is configured to provide the battery with a plurality of cells,

the second plane is flush with the first side.

16. The battery of claim 13, wherein the battery is configured to provide the battery with a plurality of cells,

the first box body further comprises a fourth side wall, and the fourth side wall is adjacent to the first side wall;

one end of the fourth side wall is connected with the first end wall, the connecting part is arranged at the other end of the fourth side wall, and the connecting part protrudes out of the fourth side wall towards the direction deviating from the closed space.

17. The battery of claim 13, wherein the battery is configured to provide the battery with a plurality of cells,

the battery further includes a second fastener through which the connection portion is connected to the second side face.

18. The battery of claim 17, wherein the battery is configured to provide the battery with a plurality of cells,

the connecting portion is provided with the second through hole, the second side is provided with the second screw hole, the second fastener passes the second through hole and connect in the second screw hole.

19. The battery of claim 13, wherein the battery is configured to provide the battery with a plurality of cells,

the battery further includes a second seal disposed between the connection portion and the second side.

20. The battery of claim 19, wherein the battery is configured to provide the battery with a plurality of cells,

the battery further includes a first seal disposed between the first sidewall and the first side;

wherein, the both ends of first sealing member are connected respectively in two second sealing member.

21. The battery of claim 12, wherein the battery is configured to provide the battery with a plurality of cells,

the dimension of one of the third side walls in the first direction is smaller than the dimension of the other of the third side walls in the first direction.

22. The battery of any one of claims 1-21, wherein the battery is configured to provide a battery of,

the second end wall is provided with a mounting portion for mounting the battery on an electric device.

23. An electrical device comprising a battery as claimed in any one of claims 1 to 22 for providing electrical energy.

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