CN219436039U - Box, battery and power consumption device - Google Patents

Abstract

The application is applicable to the technical field of batteries and provides a box, a battery and an electric device. The box includes end plate and curb plate, and the end plate includes main part and connecting portion, and main part is including relative first end and the second end that sets up, and at least one of first end and second end is equipped with connecting portion, and connecting portion passes through the fastener to be connected with the curb plate, is equipped with first concave-convex structure on the connecting portion, and the curb plate is equipped with the second concave-convex structure with the region that first concave-convex structure corresponds, and the curb plate passes through the cooperation and the connecting portion interlock of second concave-convex structure and first concave-convex structure to be connected. The box, the battery and the power utilization device provided by the application improve the stress relaxation performance of the joint of the end plate and the side plate.

Description

Box, battery and power consumption device

Technical Field

The application belongs to the technical field of batteries, and particularly relates to a box, a battery and an electric device.

Background

The end plate and the side plate in the box body used for the battery are generally connected in a welding mode, but in the high-temperature welding process, the side plate and the end plate deform due to uneven temperature, so that residual stress is generated in the structure, and meanwhile, the welding efficiency is low. In the related art, the end plate and the side plate are connected by a fastener, but stress relaxation occurs easily at the connection of the end plate and the side plate when connected by the fastener.

Disclosure of Invention

In view of the above, the present application provides a case, a battery, and an electric device, which aim to improve the stress relaxation performance of the connection portion between the end plate and the side plate when the end plate and the side plate are connected by a fastener.

In a first aspect, the application provides a box, including end plate and curb plate, the end plate includes main part and connecting portion, main part includes first end and the second end of following relative setting of first direction, first end with at least one of second end is equipped with connecting portion, the end plate passes through connecting portion with the curb plate is connected, connecting portion pass through the fastener with the curb plate is connected, be equipped with first concave-convex structure on the connecting portion, the curb plate with the region that first concave-convex structure corresponds is equipped with second concave-convex structure, the curb plate pass through second concave-convex structure with first concave-convex structure's cooperation with connecting portion interlock is connected.

The utility model provides a box has set up connecting portion in the main part of end plate for with the at least one end that the curb plate is connected for this end of end plate can be connected with the curb plate through connecting portion, fastener, has set up first concave-convex structure in the one side that connecting portion is used for with the curb plate contact simultaneously, has set up the second concave-convex structure with first concave-convex structure corresponding position in the curb plate, makes the curb plate can be connected with connecting portion interlock through second concave-convex structure and first concave-convex structure. When the battery monomer expands, the outward thrust is applied to the main body part of the end plate, the thrust can be dispersed through the first concave-convex structure on the connecting part and the second concave-convex structure on the side plate and conducted to the side plate from different areas, so that the stress of the corresponding areas of the connecting part and the side plate is more uniform, and the stress is not concentrated on the fastening pieces between the connecting part and the side plate, and is conducted to the side plate through the fastening pieces. Therefore, the concentrated stress at the position of the fastener can be reduced to a certain extent, and then the stress loss caused by the stress relaxation effect at the joint of the end plate and the side plate can be reduced to a certain extent, so that the stress relaxation performance at the joint is improved, and the stability of the joint of the side plate and the end plate and the stability of the overall structure of the box body can be improved.

In some embodiments, the first concave-convex structure includes first convex portions, the first convex portions are arranged on the corresponding surface of the connecting portion at intervals, and a first accommodating groove is formed between two adjacent first convex portions; the second concave-convex structure comprises second convex parts which are arranged on the corresponding surfaces of the side plates at intervals, and a second accommodating groove is formed between two adjacent second convex parts; the second accommodating groove is used for accommodating the first protruding part, and the first accommodating groove is used for accommodating the second protruding part. By adopting the structure provided by the embodiment, the first concave-convex structure and the second concave-convex structure are simple in structure and convenient to process.

In some embodiments, the first concave-convex structure includes a first convex portion and a first concave portion, the first convex portion and the first concave portion being alternately disposed at the connection portion; the second concave-convex structure comprises a second convex part and a second concave part, and the second convex part and the second concave part are arranged on the side plate in a staggered way; the second concave part is in plug-in fit with the first convex part, and the first concave part is in plug-in fit with the second convex part.

The structure that first concave-convex structure and second concave-convex structure adopted this embodiment to provide, simple structure is convenient for process, compares only to set up first convex part and second convex part, can further increase first concave-convex structure and second concave-convex structure's area of contact, improves the frictional force between connecting portion and the curb plate, further reduces the concentrated stress of fastener place in the use.

In some embodiments, a surface of at least one of the first protrusion and the second protrusion is curved. The surface of corresponding convex part adopts the curved surface, compares with the surface of this convex part adopts the structure of a plurality of planes, and in the assembly process, first unsmooth structure and second unsmooth structure are difficult for taking place to interfere, and the interlock is more easy.

In some embodiments, the first protrusion is an elongated structure extending along a second direction, the second direction being non-parallel to the length direction of the side plate. By adopting the scheme of the embodiment, the first convex part adopts the strip-shaped structure, so that when the end plate is subjected to the outward thrust force applied by the battery monomer along the length direction of the side plate, at least part of the energy of the thrust force can be guided to other directions through the first convex part, and the concentrated stress of the position of the fastener between the side plate and the end plate is reduced.

In some embodiments, two ends of the first protrusion along the second direction extend to two opposite side walls of the connecting portion, respectively. By adopting the scheme provided by the embodiment, the two ends of the first convex part along the second direction respectively extend to the two opposite side walls of the connecting part, compared with the two ends of the first convex part which cannot reach the side walls of the connecting part, the length of the first convex part can be longer, so that the size of the first concave-convex structure is larger, the contact surface between the connecting part and the side plate is larger, the biting force and the friction force between the connecting part and the side plate are larger, and the concentrated stress of the position of the fastener between the connecting part and the side plate in the use process can be further reduced.

In some embodiments, the second protrusion is an elongated structure, the elongated structure extends along a second direction, and the second direction is not parallel to the length direction of the side plate. By adopting the scheme of the embodiment, the second convex part adopts the strip-shaped structure, so that when the end plate is subjected to the outward thrust force applied by the battery monomer along the length direction of the side plate, at least part of the energy of the thrust force can be guided to other directions through the second convex part, and the concentrated stress of the position of the fastener between the side plate and the end plate is reduced.

In some embodiments, two ends of the second protrusion along the second direction extend to two opposite side walls of the side plate respectively. By adopting the scheme provided by the embodiment, the two ends of the second convex part along the second direction extend to the two opposite side walls of the side plate respectively, compared with the two ends of the second convex part which cannot reach the side wall of the side plate, the length of the second convex part can be longer, so that the size of the second concave-convex structure is larger, the contact surface between the side plate and the side plate is larger, the biting force and the friction force between the side plate and the side plate are larger, and the concentrated stress of the position of the fastener between the side plate and the side plate in the use process can be further reduced.

In some embodiments, the longitudinal section outer contour lines of the first concave-convex structure and the second concave-convex structure are all wavy lines. By adopting the scheme provided by the embodiment, the longitudinal section external contour lines of the first concave-convex structure and the second concave-convex structure are wavy lines, so that the design and the processing are convenient, and the first concave-convex structure and the second concave-convex structure are easy to be engaged. In some embodiments, the longitudinal cross-sectional outer contour lines of the first relief structure and the second relief structure are both sinusoidal. By adopting the scheme provided by the embodiment, the longitudinal section outer contour lines of the first concave-convex structure and the second concave-convex structure are sinusoidal, so that the design and the processing are convenient, and the first concave-convex structure and the second concave-convex structure are easy to be engaged.

In some embodiments, the spacing between adjacent two of the fasteners is 40mm-70mm. The space provided by the embodiment is adopted between two adjacent fasteners, so that the number of the required fasteners is small, and the connection between the connecting part and the side plate is stable.

In some embodiments, the spacing between adjacent two of the fasteners is 50mm-60mm. The space provided by the embodiment is adopted between two adjacent fasteners, so that the number of the required fasteners is small, and the connection between the connecting part and the side plate is stable.

In some embodiments, the connecting portion and the side plate are detachably connected by the fastener. Thus, the end plate and the side plate are convenient for a user to install and detach according to the use requirement, and the convenience of the box body in use can be improved.

In some embodiments, the end plate further comprises a reinforcing portion located in a space surrounded by the connecting portion and the main body portion and connected to the connecting portion and the main body portion, respectively. The setting of strengthening portion can play the reinforcement effect, strengthens the mechanical strength of junction between connecting portion and the main part, improves its impact resistance, when reducing main part atress, the risk that the junction between connecting portion and the main part takes place to warp.

In some embodiments, the reinforcement is a triangular structure. The reinforcing part adopts a triangle structure, has simple and stable structure, is favorable for enhancing the integrity of the end plate, and can reduce the risk of local instability of the end plate at the joint between the connecting part and the main body part to a certain extent.

In some embodiments, the thickness of the reinforcement portion is the same as the thickness of the side plate or the difference between the two is within a preset error. By adopting the scheme provided by the embodiment, the supporting strength of the reinforcing part to the connecting part is higher, and the required material is less.

In some embodiments, the spacing between two adjacent ones of the stiffeners satisfies the following condition:

；

wherein, the liquid crystal display device comprises a liquid crystal display device,L _c for the spacing between two adjacent ones of said reinforcements,hfor the height of the side plates,t _w is the thickness of the side plate.

The spacing between two adjacent reinforcing parts is adoptedAnd 40, can make the number of reinforcing portions smaller, and can make the strength of the connection between the connecting portion and the main body portion sufficiently large to satisfy the useRequirements.

In some embodiments, the reinforcement is a metal. The reinforcing part adopts a metal part, has excellent mechanical strength and can meet the use requirement.

In some embodiments, the end plate is a unitary piece. The end plate adopts an integral piece, and has simple and stable structure.

In some embodiments, the side panels are one piece. The side plate adopts an integral piece, and has simple and stable structure.

In a second aspect, the present application provides a battery, including a battery cell and a case provided in each of the above embodiments. The battery monomer is arranged in the box body. The battery provided by the application, including the box that above-mentioned each embodiment provided, can reduce the concentrated stress of fastener place position to a certain extent, and then can reduce the stress loss that end plate and curb plate junction brought because of stress relaxation effect to a certain extent for the stress relaxation performance of this department can be improved, can improve battery structure's stability.

In a third aspect, the present application provides an electrical device, including a battery provided in each of the foregoing embodiments, where the battery is configured to provide electrical energy to the electrical device. The power utilization device provided by the application comprises the battery provided by each embodiment, so that the concentrated stress of the position of the fastener can be reduced to a certain extent, and then the stress loss caused by the stress relaxation effect at the joint of the end plate and the side plate can be reduced to a certain extent, the stress relaxation performance of the joint can be improved, and the stability of the battery structure in the power utilization device can be improved.

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

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 a schematic view illustrating an internal structure of a battery according to some embodiments of the present application, in which a cover is not covered;

FIG. 3 is a schematic view of a partial structure of a case according to some embodiments of the present application;

FIG. 4 is a schematic view of a partial structure of an end plate used in the case of some embodiments of the present application;

FIG. 5 is a schematic view of a part of an end plate used in a case according to other embodiments of the present application;

FIG. 6 is a schematic view of a partial structure of a side plate used in the case of some embodiments of the present application;

FIG. 7 is a schematic view of a part of a side plate used in the case according to other embodiments of the present application;

FIG. 8 is a schematic view of a partial enlarged structure at A in FIG. 7;

fig. 9 is a schematic view of a longitudinal section outline of a first concave-convex structure and a second concave-convex structure used in the case of some embodiments of the present application;

fig. 10 is a schematic side view of a housing for a battery according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

1000. a vehicle;

100. battery 200, controller 300, motor;

10. the battery comprises a shell, 11, a cover body, 12, a box body, 20 and a battery monomer;

121. An end plate; 122. a side plate 123, a fastener 124, a first concave-convex structure 125, a second concave-convex structure 126, a bottom plate 127, a longitudinal section outer contour line of the first concave-convex structure 128 and a longitudinal section outer contour line of the second concave-convex structure;

1211. a main body portion 1212, a connecting portion 1213, a reinforcing portion 1214, a first end 1215, a second end 1241, a first convex portion 1242, a first accommodation groove 1243, a first concave portion 1251, a second convex portion 1252, a second accommodation groove 1253, and a second concave portion;

z, a first direction, X, a second direction, Y, a length direction of a side plate, d, a distance between two adjacent fasteners, t1, a thickness of a reinforcing part,t _w and the thickness of the side plate.

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 "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: a exists alone, A and B exist together, and B exists alone. 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 "center", "longitudinal", "transverse", "length", "height", "thickness", "up", "down", "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 device 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.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

The battery generally includes a housing and a battery cell. The shell comprises a box body and a cover body, the box body is of a box-shaped structure with a top opening, the cover body covers the top opening of the box body, and the cover body and the box body form a closed space. The battery cell is installed in the closed space. In addition, the enclosed space is generally filled with an electrolyte.

In general, the side plates and the end plates in the box body are connected in a welding mode, but in the high-temperature welding process, the side plates and the end plates deform due to uneven temperature, so that residual stress is generated in the structure, the stress relaxation phenomenon easily occurs in the box body in the using process, the reliability of the box body for clamping the battery monomer is poor, the welding efficiency is low, the welding quality is difficult to ensure, and the disassembly and recovery operation of parts inside the battery are difficult. In order to solve this problem, in the related art, the connection manner of the side plate and the end plate is changed to a connection manner by a fastener such as a bolt, a rivet, or the like. However, when the side plate and the end plate are connected by using the fastener, in order to install the fastener, holes are required to be formed in the side plate and the end plate, which may cause stress concentration. And when the battery is used for a period of time, the battery monomer can expand to apply outside thrust to the end plate, this thrust can concentrate on the fastener this moment, and the shear deformation through the fastener is conducted to the curb plate, makes the curb plate receive outside thrust or pulling force, makes the fastener appear stress relaxation like this easily, leads to the fastener to reduce the restriction power of curb plate and end plate, and the connection stability of curb plate and end plate reduces.

In order to improve the stress relaxation phenomenon that end plate and curb plate junction appear when end plate and curb plate pass through the fastener and connect, this application embodiment provides a box, be used for the at least one end of being connected with the curb plate in the main part of end plate to have set up connecting portion for this end of end plate can be connected with the curb plate through connecting portion, fastener, set up first concave-convex structure on the one side that connecting portion is used for contacting with the curb plate simultaneously, set up second concave-convex structure with first concave-convex structure corresponding position in the curb plate, make the curb plate can pass through second concave-convex structure and first concave-convex structure and connecting portion interlock be connected. When the battery monomer expands, the outward thrust is applied to the main body part of the end plate, the thrust can be dispersed through the first concave-convex structure on the connecting part and the second concave-convex structure on the side plate and conducted to the side plate from different areas, so that the stress of the corresponding areas of the connecting part and the side plate is more uniform, and the stress is not concentrated on the fastening pieces between the connecting part and the side plate, and is conducted to the side plate through the fastening pieces. Therefore, the concentrated stress at the position of the fastener can be reduced to a certain extent, and then the stress loss caused by the stress relaxation effect at the joint of the end plate and the side plate can be reduced to a certain extent, so that the stress relaxation phenomenon at the joint is improved, and the stability of the joint of the side plate and the end plate and the stability of the overall structure of the box body can be improved.

The case disclosed in the embodiments of the present application may be used for an electric device using the case as a battery cell container or various energy storage systems using the case as a battery cell container. The power device may be, but is not limited to, a cell phone, tablet, notebook computer, electric toy, electric tool, battery car, electric car, ship, spacecraft, etc. 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 structural 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 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. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. 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.

Referring to fig. 2, the battery 100 includes a case 10 and a battery cell 20 located inside the case 10. The plurality of battery cells 20 may be connected in series or parallel or a series-parallel connection, wherein the series-parallel connection refers to that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the shell 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the housing 10. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc.

The casing 10 includes a casing 12 and a cover 11, the casing 12 has a box structure with a top opening, and the cover 11 covers the top opening of the casing 12 and encloses a closed space with the casing 12. The battery cell is arranged in the closed space. In addition, the enclosed space is generally filled with an electrolyte.

Referring to fig. 2-8, according to some embodiments of the present application, a case 12 is provided. The case 12 includes an end plate 121 and a side plate 122. The end plate 121 includes a main body portion 1211 and a connecting portion 1212. The main body portion 1211 includes a first end 1214 and a second end 1215 disposed opposite in the first direction Z. At least one of the first end 1214 and the second end 1215 is provided with a connecting portion 1212. The end plate 121 is connected to the side plate 122 via a connection portion 1212. The connecting portion 1212 is connected to the side plate 122 by a fastener 123. The contact surface between the connecting portion 1212 and the side plate 122 is provided with a first concave-convex structure 124. The surface of the side plate 122 is provided with a second concave-convex structure 125 in a region corresponding to the first concave-convex structure 124. The side plate 122 is snap-coupled to the coupling portion 1212 by the engagement of the second concave-convex structure 125 and the first concave-convex structure 124.

In this embodiment, two side plates 122 are generally disposed, and the two side plates 122 are opposite to each other and spaced apart from each other. The end plate 121 may be provided with one or two. When one end plate 121 is disposed, and one end of two side plates 122 can be connected through a plate body to form a U-shaped structure, the end plate 121 is mounted at an opening of the U-shaped structure. When two end plates 121 are provided, the two end plates 121 are provided at both ends of the side plate 122, respectively.

The main body 1211 is generally a plate perpendicular to the side plates 122, or may have an included angle with the side plates 122, and is mainly used for sealing the opening between the two side plates 122. The main body portion 1211 is generally rectangular in configuration, or square in configuration, having four ends, with the first end 1214 being the end in contact with one of the side plates 122 and the second end 1215 being the end in contact with the other side plate 122.

The connection portion 1212 is typically a plate body provided at an edge of the main body 1211, and is located at a side of the main body 1211 remote from the battery cell 20. The connection portion 1212 may be provided with one, two, three, or four. When one connection portion 1212 is provided, the connection portion 1212 may be connected to the first end 1214 or the second end 1215. When two connecting portions 1212 are provided, one connecting portion 1212 may be connected to the first end 1214, and the other connecting portion 1212 may be connected to the second end 1215, as shown in fig. 2 and 3, where the end plate 121 is a U-shaped plate, and two shorter sides of the U-shaped plate are the connecting portions 1212 for attaching to the side plate 122, and are connected to the side plate 122 by fasteners 123; one of the connection portions 1212 may be connected to the first end 1214, and the other connection portion 1212 may be connected to the other end of the end plate 121, such as the end of the end plate 121 for connection to the bottom plate 126, or the end of the end plate 121 for connection to the cover 11. When three connection portions 1212 are provided, one of the connection portions 1212 may be connected to the first end 1214, one of the connection portions 1212 may be connected to the second end 1215, and the other connection portion 1212 may be connected to the other end of the end plate 121, such as the end of the end plate 121 for connection to the bottom plate 126, or the end of the end plate 121 for connection to the cover 11; one connecting portion 1212 may be connected to the first end 1214, one connecting portion 1212 may be connected to an end of the end plate 121 for connection to the bottom plate 126, and the other connecting portion 1212 may be connected to an end of the end plate 121 for connection to the cover 11. When four connection portions 1212 are provided, one connection portion 1212 may be provided at each end of the end plate 121.

When a plurality of connection portions 1212 are provided, the structures of the different connection portions 1212 may be the same or different, and the connection portions 1212 may be flexibly set according to the use requirements.

The first direction Z is generally a direction perpendicular to the plate surface of the side plate 122, that is, a normal direction of the plate surface of the side plate 122, or may be a direction having a certain included angle with the normal direction of the plate surface of the side plate 122, specifically may be determined according to the shapes and installation requirements of the side plate and the end plate, as long as the end plate can be connected with the side plate through the connection portion, and meets the use requirement.

The fastening member 123 may include a bolt and a nut, may include a rivet, and may further include other members, so long as the connecting portion 1212 and the side plate 122 can obtain a pre-tightening force through the fastening member 123, and may specifically be flexibly selected according to use requirements. The pre-tightening force refers to a force applied in advance in the connection (the manner and purpose of the connection are various) before the connection is subjected to the work load in order to enhance the reliability and tightness of the connection, so as to prevent the occurrence of a gap or relative slip between the connection portion 1212 and the side plate 122 after the load is applied.

The first concave-convex structure 124 means that the connection portion 1212 is provided with a convex structure or a concave structure on a surface contacting the side plate 122, or is provided with both a convex structure and a concave structure, so that the surface is uneven. The second concave-convex structure 125 refers to a concave-convex structure that is adapted to the first concave-convex structure 124 in a region of the side plate 122 for contacting the first concave-convex structure 124. The adaptation here means that the second concave-convex structure 125 and the first concave-convex structure 124 can be engaged with each other. Occlusion refers to two surfaces with uneven surfaces that can contact and seize each other.

The assembly and working principle of the case 12 provided in this embodiment of the present application are as follows, and for convenience of description, the fastener 123 is illustrated by taking the example that it includes a bolt and a nut:

when the case 12 is assembled, the side plates 122 and the bottom plate 126 are connected, and then the battery cells 20 are placed between the two side plates 122 in a predetermined arrangement. The preset arrangement modes are generally arranged in sequence along the length direction of the side plates 122, and other arrangement modes can be adopted, and particularly can be flexibly selected according to the use requirement. Since the side plate 122 is a generally rectangular plate body, the longer side thereof is the longer side thereof, and the longitudinal direction of the side plate 122 is parallel to the longer side. When the side plate 122 is a square plate body, the longitudinal direction of the side plate 122 is perpendicular to the plate surface of the main body 1211 of the end plate 121.

And then, the end plate 121 is pushed to a designated position according to the pretightening force requirement of the battery cell 20, and at the moment, the end plate 121 has a compression effect on the battery cell 20, and the battery cell 20 is in a compressed state. Then, in this state, holes are punched at the positions corresponding to the end plate 121 and the side plate 122, respectively, whose hole diameters should not be smaller than the diameters of the screws in the bolts, so that the bolts can smoothly pass through the holes on the end plate 121 and the side plate 122, and fix the positions of both. It is of course also possible to punch holes in the corresponding positions of the end plate 121 and the side plate 122 before assembling the end plate 121 and the side plate 122, and then to push the end plate 121 to the specified positions. Finally, nuts on the upper and lower sides of the bolts are tightened to apply a compressive stress to the end plate 121 and the side plate 122, thereby fixing the bolts to the two plates.

The bolts provide two forces for the connection of the entire module after the bolts are tightened. Wherein the screws mainly provide the shearing force tau and restrain the deformation between the end plate 121 and the side plate 122 due to the compression of the battery cell 20. In addition, the nut provides a compressive stress FN to the connection of the end plate 121 and the side plate 122 during tightening. In the related art, the pretightening force thereof is transmitted to the side plate 122 entirely by the screw. The screw and side plate 122 openings tend to cause stress concentration effects which increase the risk of failure of the connection of the tank 12 and also exacerbate stress relaxation which results in loss of preload in the connection between the side plate 122 and the end plate 121 during use.

When the case 12 provided in the embodiment of the present application is used and if the battery unit 20 expands, when an outward pushing force is applied to the end plate 121 (generally outward along the length direction of the side plate 122), the pushing force can be conducted to the connecting portion 1212 through the main body portion 1211 of the end plate 121, and then conducted to the side plate 122 through the connecting portion 1212.

In this process, since the connecting portion 1212 and the side plate 122 are connected by the first concave-convex structure 124 and the second concave-convex structure 125 in a snap-fit manner, a mechanical snap-fit force is increased between the end plate 121 and the side plate 122, and meanwhile, the contact area between the connecting portion 1212 and the side plate 122 is increased due to the design of the first concave-convex structure 124 and the second concave-convex structure 125, so that the friction force between the connecting portion 1212 and the side plate 122 is increased, a part of the pushing force acting on the connecting portion 1212 can be uniformly conducted to the side plate 122 through the mechanical snap-fit force and the friction force, and a part of the pushing force can be conducted to the side plate 122 through the shearing force of the fastening member 123, so that the shearing force of the fastening member 123 between the connecting portion 1212 and the side plate 122 can be reduced to some extent, the concentrated stress at the fastening member 123 can be reduced, the stress distribution is more uniform, and the stress relaxation of the fastening member 123 caused by the stress concentration can be weakened to some extent.

In the case 12 provided in this embodiment, at least one end of the main body 1211 of the end plate 121, which is used for being connected with the side plate 122, is provided with the connecting portion 1212, so that the end of the end plate 121 can be connected with the side plate 122 through the connecting portion 1212 and the fastening member 123, meanwhile, a first concave-convex structure 124 is provided on a surface of the connecting portion 1212, which is used for being in contact with the side plate 122, and a second concave-convex structure 125 is provided in a position of the side plate 122, which corresponds to the first concave-convex structure 124, so that the side plate 122 can be in snap connection with the connecting portion 1212 through the second concave-convex structure 125 and the first concave-convex structure 124. Thus, when the battery cell 20 expands, an outward pushing force is applied to the main body 1211 of the end plate 121, the pushing force can be dispersed by the first concave-convex structure 124 on the connecting portion 1212 and the second concave-convex structure 125 on the side plate 122, and conducted from different areas to the side plate 122, so that the corresponding areas of the connecting portion 1212 and the side plate 122 are more uniformly stressed, but not all concentrated on the fastening member 123 between the connecting portion 1212 and the side plate 122, and conducted to the side plate 122 through the fastening member 123. So can reduce the concentrated stress of fastener 123 position department to a certain extent, and then can reduce the stress loss that end plate 121 and curb plate 122 junction brought because of stress relaxation effect to a certain extent for the stress relaxation performance of this department is improved, can improve the stability that curb plate 122 and end plate 121 connect and the stability of box 12 overall structure.

In some embodiments, as shown in fig. 4 and 6, the first concave-convex structure 124 includes first convex portions 1241 and first accommodation grooves 1242, the first convex portions 1241 are disposed at intervals on the connecting portion 1212, and the first accommodation grooves 1242 are formed between two adjacent first convex portions 1241. The second concave-convex structure 125 includes second convex portions 1251 and second accommodation grooves 1252, the second convex portions 1251 are disposed on the side plate 122 at intervals, and the second accommodation grooves 1252 are formed between two adjacent second convex portions 1251. The second accommodation groove 1252 is for accommodating the first protrusion 1241, and the first accommodation groove 1242 is for accommodating the second protrusion 1251.

The first protrusion 1241 may be a bump, a rib, or the like formed on a surface of the connection portion 1212 for contacting the side plate 122.

The second convex portion 1251 may be a bump, a rib, etc. formed on the surface of the side plate 122, and its structure may be the same as or different from that of the first convex portion 1241, and may be flexibly selected according to the use requirement.

The shape and size of the first receiving groove 1242 are generally equal to those of the second protruding portion 1251, or the size of the first receiving groove 1242 is slightly larger than that of the second protruding portion 1251, and may be specifically set according to the use requirement. It means that the volume of the second protrusion 1251 is the same as the size of the receiving space of the first receiving groove 1242 or the difference between them is small and within an acceptable error. An acceptable error refers to an error caused by a processing apparatus, a processing process, an operation, or the like without affecting the insertion of the second convex portion 1251 into the first accommodation groove 1242.

The shape and size of the second receiving groove 1252 are generally equal to those of the first protrusion 1241, or the size of the second receiving groove 1252 is slightly larger than that of the first protrusion 1241, which may be specifically set according to the use requirement. It means that the volume of the first protrusion 1241 is the same as the size of the receiving space of the second receiving groove 1252, or the difference between them is small and within an acceptable error. Acceptable errors refer to errors due to processing equipment, processing, operations, etc., without affecting the insertion of the first protrusion 1241 into the second accommodation groove 1252.

With the structure provided in this embodiment, the first concave-convex structure 124 and the second concave-convex structure 125 are simple in structure and convenient to process.

In other embodiments, as shown in fig. 5, 7 and 8, the first concave-convex structure 124 includes a first convex portion 1241 and a first concave portion 1243, and the first convex portion 1241 and the first concave portion 1243 are staggered on the corresponding surface of the connecting portion 1212. The second concave-convex structure 125 includes second convex portions 1251 and second concave portions 1253, and the second convex portions 1251 and the second concave portions 1253 are alternately arranged on the respective surfaces of the side plates 122. The second concave portion 1253 is in plug-in fit with the first convex portion 1241, and the first concave portion 1243 is in plug-in fit with the second convex portion 1251.

The first protrusion 1241 may be a bump, a rib, or the like formed on a surface of the connection portion 1212 for contacting the side plate 122. The first recess 1243 may be a pit, a groove, or the like formed on a surface of the connection portion 1212 for contacting the side plate 122. The first protruding portions 1241 and the first recessed portions 1243 are disposed on the corresponding surfaces of the connecting portion 1212 in a staggered manner, that is, one first recessed portion 1243 is disposed between two adjacent first protruding portions 1241, and one first protruding portion 1241 is disposed between two adjacent first recessed portions 1243, that is, the first protruding portions 1241 and the first recessed portions 1243 are disposed on the corresponding surfaces of the connecting portion 1212 in a manner of the first protruding portions 1241, the first recessed portions 1243, the first protruding portions 1241 and the first recessed portions 1243 and … …, or in a manner of the first recessed portions 1243, the first protruding portions 1241, the first recessed portions 1243 and the first protruding portions 1241 and … …. The corresponding surface of the connecting portion 1212 refers to a face of the connecting portion 1212 for contact with the side plate 122.

The second convex portion 1251 may be a bump, a rib, etc. formed on the surface of the side plate 122, and its structure may be the same as or different from that of the first convex portion 1241, and may be flexibly selected according to the use requirement. The second concave portion 1253 may be a pit, a groove, or the like formed on the surface of the side plate 122. The second convex portions 1251 and the second concave portions 1253 are alternately arranged on the corresponding surfaces of the side plates 122, that is, one second concave portion 1253 is arranged between two adjacent second convex portions 1251, and one second convex portion 1251 is arranged between two adjacent second concave portions 1253, that is, the second convex portions 1251 and the second concave portions 1253 are arranged on the corresponding surfaces of the side plates 122 in the mode of the second convex portions 1251, the second concave portions 1253, the second convex portions 1251 and the second concave portions 1253 and … …, or in the mode of the second concave portions 1253, the second convex portions 1251, the second concave portions 1253 and the second convex portions 1251 and … …. The corresponding surface of the side plate 122 refers to a surface of the side plate 122 for contact with the connecting portion 1212.

The second concave portion 1253 is in plug-fit with the first convex portion 1241, which means that the first convex portion 1241 can be inserted into the second concave portion 1253, and the shape of the second concave portion 1253 is the same as the shape of the first convex portion 1241, and the size of the second concave portion 1253 is equal to the size of the first convex portion 1241. Equivalent means that the two are the same size or within reasonable processing errors.

The first concave portion 1243 is in plug-fit with the second convex portion 1251, which means that the second convex portion 1251 can be inserted into the first concave portion 1243, the shape of the first concave portion 1243 is the same as the shape of the second convex portion 1251, and the size of the first concave portion 1243 corresponds to the size of the second convex portion 1251. Equivalent means that the two are the same size or within reasonable processing errors.

The first concave-convex structure 124 and the second concave-convex structure 125 adopt the structure provided by this embodiment, and the structure is simple, and is convenient for processing, and compared with only setting up first convex part 1241 and second convex part 1251, the contact area of first concave-convex structure 124 and second concave-convex structure 125 can be further increased, the frictional force between connecting portion 1212 and curb plate 122 is improved, and the concentrated stress of fastener place in the use is further reduced.

In some embodiments, as shown in fig. 4 to 8, a surface of at least one of the first protrusion 1241 and the second protrusion 1251 is curved. A curved surface is a locus of spatially continuous motion of a line under a given condition.

The curved surface of at least one of the first convex portion 1241 and the second convex portion 1251 includes the following schemes: first, the surface of the first convex portion 1241 is a curved surface; second, the surface of the second convex portion 1251 is a curved surface; third, the surfaces of the first convex portion 1241 and the second convex portion 1251 are curved.

Regardless of the above-described scheme, the surface of the corresponding convex portion adopts a curved surface, and the first concave-convex structure 124 and the second concave-convex structure 125 are less likely to interfere with each other and are more likely to bite in the assembly process than a structure in which the surface of the convex portion adopts a plurality of planes.

In some embodiments, as shown in fig. 4 and 5, the first protruding portion 1241 is an elongated structure, and the elongated structure extends along the second direction X, and the second direction X is not parallel to the length direction Y of the side plate.

The elongated structure means that the dimension of the first protruding portion 1241 in the length direction is significantly larger than the dimension thereof in the width direction and the height direction. Significantly larger means that the dimension in the longitudinal direction is greater than or equal to 2 times the dimension in the width direction, and the dimension in the longitudinal direction is greater than or equal to 2 times the dimension in the height direction.

The non-parallel arrangement means that the second direction X and the length direction Y of the side plate form a non-zero included angle. The second direction X may be a height direction of the side plate, or may be another direction that is disposed at an acute angle or an obtuse angle with respect to the length direction Y of the side plate, and specifically may be flexibly selected according to use requirements.

By adopting the solution of the present embodiment, the first protrusion 1241 adopts a strip structure, so that when the end plate 121 receives the outward thrust force applied by the battery cell 20 along the side plate length direction Y, at least part of the energy of the thrust force can be guided to other directions through the first protrusion 1241, thereby reducing the concentrated stress at the position of the fastener between the side plate and the end plate 121.

In some embodiments, as shown in fig. 4 and 5, two ends of the first protrusion 1241 along the second direction X extend to two opposite sidewalls of the connecting portion 1212.

The two ends of the first protruding portion 1241 extend to two opposite sidewalls of the connecting portion 1212, respectively, which means that two end surfaces of the first protruding portion 1241 in the second direction X are flush with the two opposite sidewalls of the connecting portion 1212, respectively. The two sidewalls disposed opposite to each other are generally two sidewalls disposed at intervals in the second direction X.

By adopting the scheme provided in this embodiment, the two ends of the first protruding portion 1241 along the second direction X extend to two opposite side walls of the connecting portion 1212 respectively, and compared with the two ends of the first protruding portion 1241 cannot reach the side walls of the connecting portion 1212, the length of the first protruding portion 1241 can be made longer, so that the size of the first concave-convex structure 124 is larger, the contact surface between the connecting portion 1212 and the side plate is further made larger, the biting force and the friction force between the connecting portion 1212 and the side plate are both larger, and the concentrated stress of the position of the fastener between the connecting portion 1212 and the side plate in the use process can be further reduced.

In some embodiments, as shown in fig. 6 and 7, the second protruding portion 1251 is an elongated structure, and the elongated structure extends along a second direction X, and the second direction X is not parallel to the length direction Y of the side plate 122.

The elongated structure means that the dimension of the second convex portion 1251 in the length direction is significantly larger than the dimension thereof in the width direction and the height direction. Significantly larger means that the dimension in the longitudinal direction is greater than or equal to 2 times the dimension in the width direction, and the dimension in the longitudinal direction is greater than or equal to 2 times the dimension in the height direction.

The non-parallel arrangement means that the second direction X forms a non-zero angle with the length direction Y of the side plate 122. The second direction X may be a height direction of the side plate 122, or may be other directions that are disposed at an acute angle or an obtuse angle with respect to a length direction of the side plate 122, and may be specifically and flexibly selected according to use requirements.

By adopting the solution of this embodiment, the second convex portion 1251 adopts a strip-shaped structure, so that when the end plate receives the pushing force applied by the battery cell 20 and directed outwards along the length direction of the side plate 122, at least part of the energy of the pushing force can be guided to other directions through the second convex portion 1251, thereby reducing the concentrated stress of the position where the fastener between the side plate 122 and the end plate is located.

In some embodiments, the second protrusions 1251 extend to opposite sidewalls of the side plate 122 along the second direction X, respectively.

The two ends of the second convex portion 1251 along the second direction X extend to two opposite side walls of the side plate 122, respectively, which means that two end surfaces of the second convex portion 1251 are flush with two opposite side walls of the side plate 122. The two sidewalls disposed opposite to each other are generally two sidewalls disposed at intervals in the second direction X.

By adopting the scheme provided in this embodiment, the two ends of the second convex portion 1251 along the second direction X extend to two opposite side walls of the side plate 122 respectively, and compared with the two ends of the second convex portion 1251 cannot reach the side walls of the side plate 122, the length of the second convex portion 1251 can be longer, so that the size of the second concave-convex structure 125 is larger, the contact surface between the side plate 122 and the side plate 122 is larger, the biting force and the friction force between the two are larger, and the concentrated stress of the position of the fastener between the two in the use process can be further reduced.

In some embodiments, as shown in fig. 9, the longitudinal cross-sectional outer contour lines of the first concave-convex structure 124 and the second concave-convex structure 125 are wavy lines. That is, the first concave-convex structure has a wavy line on its longitudinal section outer contour line 127, and the second concave-convex structure has a wavy line on its longitudinal section outer contour line 128.

The longitudinal section of the first concave-convex structure 124 refers to a section of the first concave-convex structure 124 in the longitudinal direction Y of the side plate 122. The longitudinal section of the second concave-convex structure 125 refers to the section of the second concave-convex structure 125 in the longitudinal direction Y of the side plate 122. The wavy line means a curve having peaks and valleys.

By adopting the scheme provided by the embodiment, the external contour lines of the longitudinal sections of the first concave-convex structure 124 and the second concave-convex structure 125 are all wavy lines, so that the design and the processing are convenient, and the first concave-convex structure 124 and the second concave-convex structure 125 are easy to be engaged.

In some embodiments, as shown in fig. 9, the longitudinal cross-sectional outer contour lines of the first relief structure 124 and the second relief structure 125 are both sinusoidal. That is, the longitudinal section outer contour line 127 of the first concave-convex structure 124 is sinusoidal, and the longitudinal section outer contour line 128 of the second concave-convex structure 125 is also sinusoidal.

The longitudinal section of the first concave-convex structure 124 refers to a section of the first concave-convex structure 124 in the longitudinal direction Y of the side plate 122. The longitudinal section of the second concave-convex structure 125 refers to the section of the second concave-convex structure 125 in the longitudinal direction Y of the side plate 122. The sine curve is a wavy line, which can be expressed as y=asin (ωx+Φ) +k, and is defined as an image of the function y=asin (ωx+Φ) +k on a rectangular coordinate system, where sin is a sine symbol, x is a numerical value on the x axis of the rectangular coordinate system, y is a value of y corresponding to the function on the same rectangular coordinate system, and k, ω, and Φ are constants (k, ω, Φ∈r and ω+.0).

By adopting the scheme provided by the embodiment, the external contour lines of the longitudinal sections of the first concave-convex structure 124 and the second concave-convex structure 125 are sinusoidal, so that the design and the processing are convenient, and the first concave-convex structure 124 and the second concave-convex structure 125 are easy to be engaged.

In some embodiments, as shown in FIG. 10, the spacing d between two adjacent fasteners 123 is 40mm-70mm.

The distance between two adjacent fastening members 123 is generally the minimum distance between the outer contours of the two adjacent fastening members 123, or may be the minimum distance between the installation positions of the two adjacent fastening members 123, for example, the connecting portion 1212 and the side plate 122 are provided with through holes penetrating in the thickness direction, the fastening members 123 are installed in the through holes, and the distance between the two adjacent fastening members 123 may be the minimum distance between the walls of the two adjacent through holes. The space provided by the present embodiment between two adjacent fasteners 123 can make the number of fasteners 123 required smaller, and the connection between the connecting portion 1212 and the side plate 122 is stable.

In some embodiments, as shown in FIG. 10, the spacing d between two adjacent fasteners is 50mm-60mm. The space provided by the present embodiment between two adjacent fasteners 123 can make the number of fasteners 123 required smaller, and the connection between the connecting portion 1212 and the side plate 122 is stable.

In some embodiments, the connecting portion 1212 and the side plate 122 are detachably connected by a fastener 123. When the connecting portion 1212 and the side plate 122 are detachably connected by the fastener 123, the end plate 121 is also generally detachably connected to the bottom plate 126 and the cover 11. This facilitates the user to install and detach the end plate 121 and the side plate 122 according to the use requirement, and can improve the convenience of use of the case 12.

In some embodiments, the fastener 123 includes a bolt and a nut threadedly engaged with the bolt. With this structure, the fastener 123 can be detachably connected to the connecting portion 1212 and the side plate 122, facilitating assembly and disassembly of the end plate 121 and the side plate 122.

As shown in fig. 2 and 10, in some embodiments, the end plate 121 further includes a reinforcement 1213. The reinforcement portion 1213 is located in a space surrounded by the connection portion 1212 and the main body portion 1211, and is connected to the connection portion 1212 and the main body portion 1211, respectively.

The reinforcement portion 1213 may have a block, a bar-shaped structure, or another shape, and one end of the reinforcement portion 1213 may be connected to the connection portion 1212, and the other end may be connected to the main body portion 1211, or one surface of the reinforcement portion 1213 may be connected to the connection portion 1212, and the other surface may be connected to the main body portion 1211, so long as the strength of connection between the connection portion 1212 and the main body portion 1211 can be reinforced by the reinforcement portion 1213, and the risk of deformation of the connection portion between the connection portion 1212 and the main body portion 1211 when the main body portion 1211 receives a force may be reduced. It can be seen that the provision of the reinforcement portion 1213 can play a reinforcing role, enhance the mechanical strength of the junction between the connection portion 1212 and the main body portion 1211, improve the impact resistance thereof, and reduce the risk of deformation of the junction between the connection portion 1212 and the main body portion 1211 when the main body portion 1211 is subjected to a force.

In some embodiments, the reinforcement 1213 is a triangular structure. Compared with other structures, the triangle structure is simple and stable in structure. In use, the two sides of the triangular structure may be welded together with the connecting portion 1212 and the main body portion 1211, respectively, to increase the integrity of the end plate 121 when subjected to a force. The reinforcement portion 1213 has a triangular structure, is simple and stable in structure, is beneficial to enhancing the integrity of the end plate 121, and can reduce the risk of local instability of the end plate 121 at the connection portion 1212 and the main body portion 1211 to some extent.

In some embodiments, the thickness t1 of the reinforcement 1213 and the thickness of the side plate 122t _w The same or a difference between the two is within a preset error.

The preset error can be +/-0.05 mm, +/-0.03 mm and the like, and the preset error can be specifically determined according to the processing technology and the use requirement. With the solution provided by the present embodiment, the strength of the reinforcement 1213 for supporting the connection portion can be made larger, and less material is required.

In some embodiments, the spacing between adjacent two reinforcements 1213 satisfies the following condition:

；

wherein, the liquid crystal display device comprises a liquid crystal display device,L _c for the spacing between adjacent two reinforcements 1213,hto the height of the side panel 122,t _w for the thickness of the side plate 122,ktake 1.0 as constant.

Meaning +.>And 40.

Spacing between adjacent two reinforcement portions 1213L _c By usingAnd 40, the number of reinforcing portions 1213 required may be made small, and the strength of the connection between the connecting portion 1212 and the main body portion 1211 can be made sufficiently strong to meet the use requirements.

In some embodiments, the reinforcement portion 1213 is a metal portion, such as a steel sheet, a stainless steel piece, or other metal portion, so long as the strength thereof can enhance the strength of the connection between the connection portion 1212 and the main body portion 1211. The reinforcing portion 1213 is a metal portion, and has excellent mechanical strength, and can satisfy the use requirement.

In some embodiments, end plate 121 is a unitary piece. The integral member may be a structure in which the main body portion 1211 and the connecting portion 1212 are integrally connected by casting, punching, or the like. The end plate 121 is an integral piece, and has a simple and stable structure.

In some embodiments, the side panels 122 are one piece. The integral piece can be manufactured by casting, stamping and the like. The side plate 122 is an integral piece, and has simple and stable structure.

Referring to fig. 1 to 10, in the embodiment of the present application, a case 12 is provided. The case 12 includes an end plate 121 and a side plate 122. In this embodiment, two side plates 122 are generally disposed, and the two side plates 122 are opposite to each other and spaced apart from each other. The end plate 121 may be provided with one or two. When the end plate 121 is disposed in one manner, and one end of the two side plates 122 is connected through a plate body to form a U-shaped structure, the end plate 121 is mounted at an opening of the U-shaped structure. When two end plates 121 are provided, the two end plates 121 are provided at both ends of the side plate 122, respectively.

The end plate 121 includes one main body portion 1211 and two connecting portions 1212. The main body 1211 is a plate body generally perpendicular to the side plate 122. The main body portion 1211 includes oppositely disposed first and second ends. The two connection portions 1212 are connected to the first end and the second end, respectively. The connecting portion 1212 is connected to the side plate 122 by a fastener 123. The contact surface between the connecting portion 1212 and the side plate 122 is provided with a first concave-convex structure 124. The surface of the side plate 122 is provided with a second concave-convex structure 125 in a region corresponding to the first concave-convex structure 124. The side plate 122 is snap-coupled to the connection portion 1212 by the second concave-convex structure 125 and the first concave-convex structure 124.

The end plate 121 is an integral U-shaped structure, and is stamped or bent by a plate body. The fastener 123 includes a bolt and a nut. The distance d between two adjacent fasteners is 50mm-60mm.

The first concave-convex structure 124 includes a first convex portion 1241 and a first concave portion 1243, and the first convex portion 1241 and the first concave portion 1243 are disposed on the corresponding surface of the connecting portion 1212 in a staggered manner. The second concave-convex structure 125 includes second convex portions 1251 and second concave portions 1253, and the second convex portions 1251 and the second concave portions 1253 are alternately arranged on the respective surfaces of the side plates 122. The second concave portion 1253 is in plug-in fit with the first convex portion 1241, and the first concave portion 1243 is in plug-in fit with the second convex portion 1251.

The longitudinal section outer contour lines of the first concave-convex structure 124 and the second concave-convex structure 125 are both sinusoidal.

The first protruding portion 1241 is an elongated structure, and the elongated structure extends along the height direction of the side plate 122. The two ends of the first protruding portion 1241 extend to two sidewalls of the connecting portion 1212 that are disposed opposite to each other. The second convex portion 1251 is an elongated structure, which extends in the height direction of the side plate 122. Both ends of the second convex portion 1251 extend to two side walls disposed opposite to each other in the side plate 122, respectively.

A reinforcing portion 1213 is provided between the connecting portion 1212 and the main body portion 1211. The thickness of the reinforcement portion 1213 is the same as that of the side plate 122. The reinforcement 1213 is a triangular steel plate uniformly distributed on both sides of the end plate 121, which are sides on which the first and second ends are located. The triangular steel plates are welded together at both sides thereof with the connecting portion 1212 and the main body portion 1211, respectively, to increase the integrity of the end plate 121 when subjected to a force.

By adopting the box body 12 provided by the embodiment, the shearing force of the fastening piece 123 between the connecting part 1212 and the side plate 122 can be reduced to a certain extent, the stress concentration effect is reduced, the stress distribution is more uniform, and the stress relaxation effect of the fastening piece 123 caused by the stress concentration effect can be weakened to a certain extent.

Referring to fig. 2, in an embodiment of the present application, a battery 100 is provided. The battery 100 includes a battery cell 20 and a case 12 provided in any of the embodiments described above. The battery cell 20 is disposed within the case 12.

The battery 100 generally includes a cover 11 and an electrolyte in addition to the case 12 and the battery cells 20.

The battery provided by the embodiment of the application, including the box that above-mentioned each embodiment provided, can reduce the concentrated stress of fastener 123 place to a certain extent, and then can reduce the stress loss that end plate and curb plate junction brought because of stress relaxation effect to a certain extent for the stress relaxation performance of this department is improved, can improve battery structure's stability.

According to some embodiments of the present application, there is also provided an electrical device comprising a battery according to any of the above aspects, and the battery is used to provide electrical energy to the electrical device.

The powered device may be any of the aforementioned devices or systems employing batteries. The powered device generally includes other components in addition to the battery, and may be specific to the particular type of powered device. If the electric device is a vehicle, the electric device generally further comprises a controller, a motor, a vehicle body and the like.

The power utilization device provided by the embodiment of the application comprises the battery provided by each embodiment, so that the concentrated stress of the position of the fastener can be reduced to a certain extent, and further the stress loss caused by the stress relaxation effect at the joint of the end plate and the side plate can be reduced to a certain extent, the stress relaxation performance of the joint can be improved, and the stability of the battery structure in the power utilization device can be improved.

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 (22)

1. The utility model provides a box, its characterized in that, includes end plate and curb plate, the end plate includes main part and connecting portion, main part includes first end and the second end of following the relative setting of first direction, first end with at least one of second end is equipped with connecting portion, the end plate passes through connecting portion with the curb plate is connected, connecting portion pass through the fastener with the curb plate is connected, be equipped with first concave-convex structure on the connecting portion, the curb plate with the region that first concave-convex structure corresponds is equipped with the second concave-convex structure, the curb plate pass through the second concave-convex structure with first concave-convex structure's cooperation with connecting portion interlock is connected.

2. The case according to claim 1, wherein the first concave-convex structure includes first convex portions provided at intervals on the respective surfaces of the connection portions, and a first accommodation groove is formed between two adjacent first convex portions;

the second concave-convex structure comprises second convex parts which are arranged on the corresponding surfaces of the side plates at intervals, and a second accommodating groove is formed between two adjacent second convex parts;

the second accommodating groove is used for accommodating the first protruding part, and the first accommodating groove is used for accommodating the second protruding part.

3. The case according to claim 1, wherein the first concave-convex structure includes a first convex portion and a first concave portion, the first convex portion and the first concave portion being alternately provided at the connecting portion;

the second concave-convex structure comprises a second convex part and a second concave part, and the second convex part and the second concave part are arranged on the side plate in a staggered way;

the second concave part is in plug-in fit with the first convex part, and the first concave part is in plug-in fit with the second convex part.

4. A casing according to claim 2 or 3, wherein the surface of at least one of the first projection and the second projection is curved.

5. A casing according to claim 2 or 3, wherein the first projection is a strip-shaped structure extending in a second direction which is not parallel to the length direction of the side plate.

6. The cabinet as claimed in claim 5, wherein both ends of the first protrusion in the second direction are extended to two opposite sidewalls of the connection portion, respectively.

7. A casing according to claim 2 or 3, wherein the second protrusion is a strip-shaped structure extending in a second direction, the second direction being non-parallel to the length direction of the side plate.

8. The cabinet as claimed in claim 7, wherein both ends of the second protrusion in the second direction are extended to two opposite side walls of the side plate, respectively.

9. A casing according to claim 3, wherein the longitudinal section outer contours of the first and second concave-convex structures are wavy lines.

10. A casing according to claim 3, wherein the longitudinal cross-sectional outer contours of the first relief structure and the second relief structure are sinusoidal.

11. A casing according to any one of claims 1, 2, 3, 9 or 10 wherein the spacing between adjacent two of said fasteners is in the range 40mm to 70mm.

12. A casing according to any one of claims 1, 2, 3, 9 or 10 wherein the spacing between adjacent two of said fasteners is in the range 50mm to 60mm.

13. The cabinet as claimed in any one of claims 1, 2, 3, 9 or 10, wherein the connection portion and the side plate are detachably connected by the fastener.

14. The cabinet of any one of claims 1, 2, 3, 9, or 10, wherein the end plate further comprises a reinforcing portion located in a space defined by the connection portion and the main body portion and connected to the connection portion and the main body portion, respectively.

15. The cabinet of claim 14, wherein said reinforcement is of triangular configuration.

16. The cabinet as claimed in claim 15, wherein the thickness of the reinforcement portion is the same as the thickness of the side plate or a difference between the two is within a preset error.

17. The cabinet as claimed in claim 16, wherein a distance between adjacent two of the reinforcing portions satisfies the following condition:

；

wherein, the liquid crystal display device comprises a liquid crystal display device,L _c for the spacing between two adjacent ones of said reinforcements,hfor the height of the side plates,t _w is the thickness of the side plate.

18. The cabinet of claim 14, wherein said reinforcement portion is a metal portion.

19. A cabinet according to any one of claims 1, 2, 3, 9 or 10, wherein the end plates are in one piece.

20. The cabinet of any one of claims 1, 2, 3, 9 or 10, wherein said side panels are one piece.

21. A battery comprising a battery cell and the case of any one of claims 1-20, the battery cell disposed within the case.

22. An electrical device comprising the battery of claim 21, the battery being configured to provide electrical energy to the electrical device.