CN221150220U - Battery box, battery and power consumption device - Google Patents

Abstract

The application provides a battery box body, a battery and an electric device, wherein the battery box body is used for accommodating the battery, the battery comprises a plurality of battery monomers and a connecting piece electrically connected with the battery monomers, the battery box body comprises a plurality of side beams which are connected end to end and are enclosed to form an accommodating cavity, and at least one side beam is concavely formed with a concave part towards one side of the accommodating cavity, which faces away from the accommodating cavity, so that when the plurality of battery monomers are electrically connected through the connecting piece, the connecting piece can be at least partially penetrated into the concave part, the utilization rate of the space inside the battery box body is improved through the concave part, the arrangement of the connecting piece is realized, the influence of the increase of the size of the side beams on the internal structure of the battery is reduced, and the performance of the battery is improved.

Description

Battery box, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to a battery box, 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.

The current processing mode of the boundary beam in the battery box body mainly comprises stamping welding, splice welding and rolling, is limited by the manufacturing process of the boundary beam, and the processed boundary beam is large in size, occupies the internal space of the battery under the same enveloping width and influences the internal structure setting of the battery. Therefore, how to improve the space utilization in the battery case is a problem to be solved.

Disclosure of utility model

In view of the above problems, the present application provides a battery case, a battery and an electric device, which can improve the space utilization rate in the battery case, reduce the influence of the increase of the side beam size on the internal structure of the battery, and improve the performance of the battery.

In a first aspect, the application provides a battery box for accommodating a battery, the battery comprises a plurality of battery cells and a connecting piece for electrically connecting the battery cells, the battery box comprises a plurality of side beams which are connected end to end and enclose to form an accommodating cavity, at least one side beam is concavely formed with a concave part facing a side surface of the accommodating cavity and facing away from the accommodating cavity, and the concave part is used for accommodating at least part of the connecting piece.

In the embodiment of the application, the side of the boundary beam, which is away from the accommodating cavity, is recessed to form the concave part, and the concave part can at least partially accommodate the connecting piece of the battery, so that the space utilization rate in the battery box body is improved, and the arrangement of a plurality of battery monomers and the connecting piece is realized.

In some embodiments, the side rail has a first face and a second face disposed opposite to each other along a first direction, and the battery case further includes a bottom plate disposed to overlap at least a portion of the second face and closing a side opening of the accommodating chamber along the first direction, the first direction intersecting a concave direction of the concave portion. I.e., the bottom plate is fixed to the side rail as a unit to define the mounting region of the battery cell.

In some embodiments, the recess is located between and spaced from the first face and the second face in the first direction. Therefore, when the connecting piece is penetrated in the concave part, the concave part can be arranged around the periphery of the connecting piece, so that the reliability of the connecting piece is improved. And the concave part can not influence the first surface of the boundary beam, so that the connection between the boundary beam and other structures in the battery can not be influenced, and the applicability of the battery box body is improved.

In some embodiments, the side beam is a roll-formed integral structure, the side beam including a base body enclosing to form a hollow cavity, the base body being recessed into the hollow cavity to form a recess.

In the embodiment of the application, the side beam can be constructed as the rolling piece, the concave part is formed by bending the rolling piece into the hollow cavity, the rolling process is simple, and the side beam is of a hollow structure, so that the weight is reduced.

In some embodiments, the side beam further includes a supporting portion integrally disposed with the base body, two ends of the base body are connected at one side surface of the base body along the recess direction, and the supporting portion is connected to at least one end of the base body and extends into the hollow cavity to be abutted to the other side surface of the base body along the recess direction, so as to improve structural strength of the side beam.

In some embodiments, the support portion separates the base body to form a first region and a second region disposed opposite in the first direction, the second region being located on a side closer to the bottom plate, and in the second region, a cross-sectional area of the base body in the first direction gradually increases in the direction closer to the bottom plate.

In the embodiment of the application, the area of the second surface of the substrate in the first direction is gradually increased by gradually increasing the area of the substrate in the second area, so that the width of the bottom of the boundary beam is increased, the boundary beam is more convenient to connect with the bottom plate, the gravity center of the boundary beam is lowered, the anti-tilting capability of the boundary beam is increased, the rigidity of the boundary beam is also improved, and the reliability of the battery box body is improved.

In some embodiments, in the first direction, the ratio a of the size of the first region to the size of the second region satisfies: a is more than or equal to 1 and less than or equal to 2, so as to further reduce the gravity center of the side beam, increase the anti-tilting capability of the side beam and improve the reliability of the battery box body.

In some embodiments, in the second area, the substrate is disposed at least partially obliquely towards one side surface of the accommodating cavity, that is, a diagonal bracing structure is formed at the bottom of the side beam, so that the cross-sectional area of the substrate in the first direction is gradually increased, thereby simplifying the structure of the substrate and further facilitating roll forming of the side beam.

In some embodiments, the angle α between the surface of the substrate facing the accommodating chamber and the second surface is such that: the alpha is more than or equal to 80 degrees and less than 90 degrees, so that the bottom width of the side beam can be reasonably controlled, and the occupation of the side beam to the inner space of the battery box body is reduced while the rigidity and the tilting resistance of the side beam are improved.

In some embodiments, the second face includes a first sub-face and a second sub-face, the first sub-face is located on a side of the second sub-face facing away from the accommodating cavity along the recess direction, the battery case further includes a mounting beam, at least part of the mounting beam is connected to the first sub-face, and the bottom plate is connected to the second sub-face.

In the embodiment of the application, the cross-sectional area of the substrate in the first direction in the second area is gradually increased, so that the area of the second surface of the side beam is increased, and besides the bottom plate can be connected to the second surface of the side beam, the mounting beam can also be connected to the second surface of the side beam, thereby realizing the bottom support connection of the mounting beam and improving the fixed rigidity of the battery box body.

In some embodiments, the battery box further comprises a sealing part, the sealing part is filled in a gap between the mounting beam and the bottom plate, the sealing performance of the battery box is improved, and the waterproof and dustproof effects are improved.

In some embodiments, in the first direction, the distance between the first sub-surface and the first surface is smaller than the distance between the second sub-surface and the first surface, that is, a step structure is formed between the first sub-surface and the second sub-surface, so that connection and positioning of the mounting beam and the bottom plate can be facilitated, the sealing part can be coated more conveniently, and manufacturing difficulty is reduced.

In a second aspect, an embodiment of the present application provides a battery, including a battery case of the first aspect, a battery unit, and a connection member, where the plurality of battery units are disposed in the accommodating cavity, and at least part of the connection member is accommodated in a recess of the battery case and is electrically connected to the plurality of battery units.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery in a second direction, where the battery is configured to provide electrical energy.

According to the battery box, the battery and the electricity utilization device, the battery box comprises the side beams which are connected end to end and are enclosed to form the accommodating cavity, the accommodating cavity is used for accommodating the battery monomers, and the side of at least one side beam facing to the accommodating cavity is concavely provided with the concave part to the side away from the accommodating cavity, so that when the plurality of battery monomers are electrically connected through the connecting piece, the connecting piece can be at least partially penetrated into the concave part, the utilization rate of the internal space of the battery box is improved through the concave part, the arrangement of the connecting piece is realized, the influence of the increase of the size of the side beams on the internal structure of the battery is reduced, and the performance of the battery is improved.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

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 figures. In the drawings:

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

Fig. 2 is an exploded view of a battery provided in some embodiments of the application;

Fig. 3 is a schematic structural diagram of a battery cell accommodated in a battery case according to some embodiments of the present application;

Fig. 4 is a top view of a battery cell received in a battery case according to some embodiments of the present application;

FIG. 5 is a cross-sectional view at A-A in FIG. 4;

Fig. 6 is an enlarged view at B in fig. 5.

Reference numerals in the specific embodiments are as follows:

100 battery, 200 controller, 300 motor;

10 battery box bodies, 20 battery monomers and 30 connecting pieces;

1 side beam, 11 base body, 12 supporting part, 111 concave part, 2 bottom plate, 3 mounting beam, 4 sealing part;

The first surface S1, the second surface S2, the first sub-surface S21 and the second sub-surface S22;

x is the first direction.

Detailed Description

Embodiments of the technical scheme 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 aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements 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.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

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 specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Currently, with the development of technology, power batteries are increasingly used. 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.

For the power battery, the performance of the power battery can have a certain influence on the performance of the electric automobile, so the manufacturing process of the power battery is particularly important. For the battery box body of the power battery, the edge beams of the battery box body in the related art are manufactured and formed by stamping, welding, rolling and the like, particularly the rolling process, the size of the edge beams can be adjusted only by adjusting cutting control parameters and bending control parameters, and the design requirements of different vehicle types on the arrangement of the power battery can be well met.

However, the edge R angle of the edge beam manufactured by the rolling process is larger, so that the width of the edge beam is wider to ensure the tightness and the tightness of the whole edge beam, which results in more occupation of the internal space of the battery under the same enveloping width and influences the arrangement of the battery single body in the battery by the connecting piece.

Based on the above consideration, the embodiment of the application realizes the arrangement of the connecting piece by arranging the concave part on the side beam and embedding the connecting piece at least partially in the concave part when the battery cells are connected through the connecting piece. The concave part can improve the utilization rate of the internal space of the battery box body, thereby reducing the influence of the increase of the width of the boundary beam on the internal structure of the battery and improving the performance of the battery.

In order to describe the technical scheme of the present application, the battery box, the battery and the power consumption device in the embodiment of the present application are described in detail below with reference to fig. 1 to 6.

The embodiment of the application provides an electricity utilization device which comprises a battery, wherein the battery can be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like, and the battery is used for providing electric energy for an electric device, wherein the electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like.

It should be understood that the technical solution described in the embodiments of the present application is applicable to all electric devices including batteries and using batteries, but for simplicity of description, the following embodiments are described by taking electric vehicles as examples.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the application. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The battery 100 is provided in the interior of the vehicle, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle. The battery 100 may be used for power supply of a vehicle, for example, the battery 100 may be used as an operating power source of the vehicle. The vehicle 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.

Referring to fig. 2, fig. 2 is an exploded view of a battery 100 according to some embodiments of the present application.

The battery 100 in the embodiment of the application comprises a battery box 10 and a plurality of battery cells 20 accommodated in the battery box 10.

The plurality of battery cells 20 can be connected in series, parallel or series-parallel through the connecting piece 30, wherein series-parallel 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, in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the battery box 10. Of course, a plurality of battery cells 20 may be connected in series, parallel or series-parallel to form a battery module 100, and then the plurality of battery modules are connected in series, parallel or series-parallel to form a whole through the connecting member 30 and are accommodated in the battery case 10.

The connection member 30 may be a conductive member made of copper, aluminum or other materials.

Alternatively, each of the battery cells 20 may be a secondary battery or a primary battery, and the secondary battery refers to a battery cell 20 that can be continuously used by activating an active material in a charging manner after the battery cell 20 is discharged.

The battery cells 20 include, but are not limited to, lithium ion battery cells, sodium lithium ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium sulfur battery cells, magnesium ion battery cells, nickel hydrogen battery cells, nickel cadmium battery cells, lead storage battery cells, and the like.

As an example, the battery cell 20 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, but is not limited thereto. Prismatic battery cells include square-case battery cells, blade-shaped battery cells, and prismatic batteries, such as hexagonal-prism batteries.

The battery case 10 is used to provide an accommodating space for the battery cell 20, and the battery case 10 may have various structures.

In some embodiments, the battery compartment 10 may be part of the chassis structure of a vehicle. For example, a portion of the battery box 10 may become at least a portion of the floor of the vehicle, or a portion of the battery box 10 may become at least a portion of the cross member and the side member of the vehicle.

In some embodiments, the battery case 10 may include an upper case and a lower case, which are mutually covered, and which together define a receiving space for receiving the battery cell 20. The lower box body can be of a hollow structure with one end open, the upper box body can be of a plate-shaped structure, and the upper box body covers the opening side of the lower box body, so that the upper box body and the lower box body jointly define an accommodating space, the upper box body and the lower box body can also be of hollow structures with one side open, and the opening side cover of the upper box body covers the opening side of the lower box body. Of course, the battery case 10 formed of the upper case and the lower case may be various shapes, such as a cylinder, a rectangular parallelepiped, etc.

Referring to fig. 3 to 6, fig. 3 is a schematic structural diagram of a battery cell 20 accommodated in a battery case 10 according to some embodiments of the present application, fig. 4 is a top view of the battery cell 20 accommodated in the battery case 10 according to some embodiments of the present application, fig. 5 is a cross-sectional view at A-A in fig. 4, and fig. 6 is an enlarged view at B in fig. 5.

The battery box 10 in the embodiment of the application comprises a plurality of side beams 1 connected end to end and enclosing to form a containing cavity, a concave part 111 is formed on one side surface of at least one side beam 1 facing the containing cavity and a concave part 111 is formed on the side facing away from the containing cavity, and the concave part 111 is used for containing at least part of the connecting piece 30.

In the battery box 10 of the embodiment of the application, the concave portion 111 is formed on the surface of the side beam 1 facing the accommodating cavity, so that the utilization rate of the internal space of the battery box 10 can be improved through the concave portion 111, and when a plurality of battery cells 20 are electrically connected through the connecting piece 30, the connecting piece 30 can be at least partially penetrated into the concave portion 111, so that the arrangement of the connecting piece 30 is realized, the influence of the increase of the size of the side beam 1 on the internal structure of the battery 100 is reduced, and the performance of the battery 100 is improved.

It will be appreciated that depending on the particular configuration of battery 100, it may also include other components, so that recess 111 may house other components of battery 100 within recess 111 in addition to connector 30. The specific shape and size of the recess 111 can be adjusted according to the structure of the to-be-accommodated member, so as to satisfy the accommodating requirement of the to-be-accommodated member. For convenience of description, the accommodating connector 30 will be described below as an example.

Referring to fig. 6, in some alternative embodiments, the side rail 1 has a first surface S1 and a second surface S2 disposed opposite to each other along a first direction X, and the battery case 10 further includes a bottom plate 2, where the bottom plate 2 is disposed to overlap at least a portion of the second surface S2 and closes one side opening of the receiving cavity along the first direction X, and the first direction X intersects with the recess direction of the recess 111.

Wherein, the bottom plate 2 is connected to the second surface S2 of the side beam 1 and closes one side opening of the accommodating cavity along the first direction X to define an installation area for forming the battery cell 20, and the battery cell 20 is accommodated in the installation area. The bottom plate 2 and the boundary beam 1 can be fixed into a whole through resistance welding, gas shielded welding or structural adhesive bonding and the like, so that the connection strength of the battery box body 10 is improved.

Optionally, the battery case 10 further includes a water cooling plate disposed between the bottom plate 2 and the second surface S2 of the side rail 1 along the first direction X, thereby further improving the connection strength of the battery case 10.

The concave direction of the concave portion 111 is related to the installation position of the side rail 1, and the battery case 10 is exemplified as a rectangular parallelepiped, and the battery case 10 includes a first side rail oppositely arranged in the second direction and a second side rail oppositely arranged in the third direction. When the first side beam and/or the second side beam are/is provided with the concave portion 111, the concave direction of the concave portion 111 is the second direction for the first side beam, the concave direction of the concave portion 111 is the third direction for the second side beam, and the first direction X, the second direction and the third direction are perpendicular to each other.

With respect to the battery case 10 in the above-described embodiment, in some alternative embodiments, the recess 111 is located between the first face S1 and the second face S2 in the first direction X and is spaced apart from the first face S1.

The recess 111 being spaced from the first surface S1 means that the recess 111 is provided only on a side surface of the base 11 facing the accommodating chamber and does not extend to the first surface S1, so that the recess 111 can be provided around the circumference of the connector 30 when the connector 30 is inserted into the recess 111, thereby improving reliability of the connector 30. The concave portion 111 does not affect the first surface S1 of the side sill 1, and therefore, the connection between the side sill 1 and other structures in the battery 100 is not affected, and the applicability of the battery case 10 is improved.

Referring to fig. 6, in some embodiments of the present application, the side beam 1 is a roll-formed integral structure, and the side beam 1 includes a base 11 enclosing a hollow cavity, and the base 11 is partially recessed into the hollow cavity to form a recess 111.

It will be appreciated that the edge beam 1 may be configured as a roll, which may be provided as a plate-like structure, which is rolled to form the base body 11 having the hollow cavity by adjusting the bending control parameters. In addition, the roll member may be folded into the hollow cavity during the rolling process, so that the recess 111 is partially recessed into the hollow cavity on the side of the base 11 facing the accommodating cavity. The bending control parameters and the like can be adjusted according to the size of the connecting piece 30, so as to meet the accommodating requirement of the concave part 111 on the connecting piece 30.

In some alternative embodiments, the side beam 1 further includes a support portion 12 integrally provided with the base body 11, both ends of the base body 11 are connected at one side surface thereof in the concave direction, and the support portion 12 is connected to at least one end of the base body 11 and extends into the hollow cavity to abut against the other side surface of the base body 11 in the concave direction.

That is, when the side sill 1 is formed by roll forming, the side sill 1 may include a base body 11 and a supporting portion 12 integrally provided, and the supporting portion 12 extends into the hollow cavity from one side surface of the base body 11 in the recess direction to abut against the other side surface of the base body 11 in the recess direction, so as to improve the structural strength of the side sill 1.

Alternatively, the supporting portions 12 may be provided at both ends of the base 11, or may be provided at only one end of the base 11. Taking the example that the supporting portion 12 is provided only at one end of the base 11, the other end of the base 11 may be provided with a first extension section, and the structural strength of the side sill 1 is further improved by connecting the first extension section with the supporting portion 12. And/or, the end of the supporting portion 12 facing away from the base 11 may be provided with a second extension, and the structural strength of the side sill 1 may be further improved by connecting the second extension to the other side surface of the base in the recess direction.

Further, the supporting portion 12 partitions the base 11 to form a first region and a second region which are disposed opposite to each other in the first direction X, the second region being located on a side close to the bottom plate 2, and in the second region, a cross-sectional area of the base 11 in the first direction X gradually increases in the direction close to the bottom plate 2.

By gradually increasing the cross-sectional area of the base 11 in the first direction X in the second region, the area of the second surface S2 of the base 11 can be made larger than the area of the first surface S1, so that the bottom width of the side rail 1 is increased, the side rail 1 can be more easily connected with the bottom plate 2, the center of gravity of the side rail 1 can be lowered, the tilting resistance of the side rail 1 can be increased, and the rigidity of the side rail 1 can be improved, so that the reliability of the battery case 10 can be improved.

In some embodiments, in the second region, the base 11 is disposed obliquely toward one side surface of the receiving cavity, that is, a diagonal brace structure is formed at the bottom of the side sill 1, so that the cross-sectional area of the base 11 in the first direction X is gradually increased, thereby simplifying the structure of the base 11 and facilitating roll forming of the side sill 1.

Alternatively, the recess 111 may be provided in the first region, and in the second region, the base 11 is provided obliquely to the entire surface of one side of the accommodation chamber, to further simplify the structure of the base 11.

In the battery case 10 of the embodiment of the present application, the ranges of the first region and the second region may be adjusted according to the position of the recess 111, for example, the ratio a of the size of the first region to the size of the second region in the first direction X satisfies: the width of the bottom of the side beam 1 can be reasonably controlled, so that the rigidity and the tilting resistance of the side beam 1 are improved, and meanwhile, the occupation of the side beam 1 to the inner space of the battery box 10 is reduced.

In addition, in addition to adjusting the extent of the first region and the second region, the diagonal tilt angle of the base body 11 may be adjusted, for example, so that in the second region, the angle α between the side surface of the base body 11 facing the accommodation chamber and the second surface S2 satisfies: the width of the bottom of the boundary beam 1 can be adjusted by adjusting the included angle between the surface of the base body 11 and the second surface S2 when the base body 11 is inclined toward one side surface of the accommodating chamber, which is 80 degrees < α < 90 degrees.

Alternatively, a=1 and α=85° may be used to realize the structural design of the side sill 1.

Referring to fig. 6, in some alternative embodiments, the second surface S2 includes a first sub-surface S21 and a second sub-surface S22, the first sub-surface S21 is located on a side of the second sub-surface S22 facing away from the accommodating cavity along the recess direction, the battery case 10 further includes a mounting beam 3, the mounting beam 3 is at least partially connected to the first sub-surface S21, and the bottom plate 2 is connected to the second sub-surface S22.

Since the cross-sectional area of the base 11 in the second region in the first direction X gradually increases, the area of the second surface S2 of the side beam 1 increases, so that the mount beam 3 can be connected to the second surface S2 of the side beam 1 in addition to the bottom plate 2, thereby realizing the bottom connection of the mount beam 3 and improving the fixing rigidity of the battery case 10. Alternatively, the mounting beam 3 may be welded to the first sub-surface S21 of the side beam 1.

Further, the battery case 10 further includes a sealing part 4, and the sealing part 4 is filled in the gap between the mounting beam 3 and the bottom plate 2. The sealing part 4 may be provided as a sealant, and when the battery 100 is mounted in a vehicle, the sealant may be pressed to flow to fill the gap between the battery case 10 and the vehicle, thereby improving the waterproof and dustproof effects.

In some alternative embodiments, the distance between the first sub-face S21 and the first face S1 is smaller than the distance between the second sub-face S22 and the first face S1 in the first direction X.

Namely, a step structure is formed between the first subsurface S21 and the second subsurface S22, so that the connection and the positioning of the mounting beam 3 and the bottom plate 2 can be more convenient, the coating of the sealing part 4 is also more convenient, and the manufacturing difficulty is reduced. On this basis, by making the distance between the first sub-surface S21 and the first surface S1 smaller than the distance between the second sub-surface S22 and the first surface S1, the floor panel 2 can be connected to the vehicle when the battery 100 is mounted in the vehicle, so that the sealing can be realized by only disposing the sealing portion 4 between the mounting beam 3 and the floor panel 2, thereby facilitating the provision of the sealing portion 4, and reducing the overall height of the battery 100 and the vehicle after mounting, so as to meet the use requirements of various vehicle types.

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 application has been described in detail with reference to the foregoing embodiments, it will 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 application, and are intended to be included within the scope of the appended 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 (14)

1.A battery box body for a battery, the battery comprises a plurality of battery cells and a connecting piece electrically connected with the battery cells, the battery box body is characterized in that,

The battery box body comprises a plurality of side beams which are connected end to end and enclose to form a containing cavity, at least one side surface of the side beam, which faces towards the containing cavity, is concavely formed with a concave part on the side, which faces away from the containing cavity, of the side beam, and the concave part is used for containing at least part of the connecting piece.

2. The battery case according to claim 1, wherein the side rail has a first face and a second face disposed opposite to each other in a first direction, the battery case further comprising a bottom plate disposed to overlap at least a portion of the second face and closing a side opening of the accommodation chamber in the first direction, the first direction intersecting a concave direction of the concave portion.

3. The battery box of claim 2, wherein the recess is located between and spaced from the first face and the second face in the first direction.

4. The battery box of claim 2, wherein the side beams are of a roll-formed integral structure, the side beams include a base body enclosing a hollow cavity, and the base body is partially recessed into the hollow cavity to form the recess.

5. The battery box according to claim 4, wherein the side beam further comprises a support portion integrally provided with the base body, both ends of the base body are connected at one side surface thereof in the recess direction, and the support portion is connected to at least one end of the base body and extends into the hollow cavity to abut against the other side surface of the base body in the recess direction.

6. The battery case according to claim 5, wherein the support portion partitions the base body to form a first region and a second region that are disposed opposite to each other in the first direction;

The second region is located at a side close to the bottom plate, and in the second region, a cross-sectional area of the substrate in the first direction gradually increases in a direction close to the bottom plate.

7. The battery case according to claim 6, wherein a ratio a of a size of the first region and a size of the second region in the first direction satisfies: a is more than or equal to 1 and less than or equal to 2.

8. The battery case according to claim 6, wherein in the second region, the base body is disposed at least partially obliquely toward a side surface of the accommodation chamber.

9. The battery box of claim 8, wherein an angle α between a surface of the base facing the accommodating chamber and the second surface satisfies: alpha is more than or equal to 80 degrees and less than 90 degrees.

10. The battery box of claim 2, wherein the second face comprises a first sub-face and a second sub-face, the first sub-face being located on a side of the second sub-face facing away from the receiving cavity along the recess direction;

The battery box body further comprises a mounting beam, at least part of the mounting beam is connected to the first sub-surface, and the bottom plate is connected to the second sub-surface.

11. The battery box of claim 10, further comprising a seal that fills in a gap between the mounting beam and the base plate.

12. The battery compartment of claim 10, wherein a distance between the first sub-face and the first face is less than a distance between the second sub-face and the first face in the first direction.

13. A battery, comprising the battery case, a battery unit, and a connecting member according to any one of claims 1 to 12, wherein a plurality of the battery units are disposed in the accommodating chamber, and at least a portion of the connecting member is accommodated in the recess of the battery case and electrically connected to a plurality of the battery units.

14. An electrical device comprising a battery as claimed in claim 13, said battery being arranged to provide electrical energy.