CN220086254U - Battery box and battery device - Google Patents

Abstract

The present disclosure relates to the field of battery technology, and discloses a battery box. The battery box includes a bottom plate, side frames, first support beams, second support beams and connectors; the side frames are surrounded by the bottom plate and form an accommodation space with the bottom plate cavity; the first support beam is arranged in the accommodation cavity and extends along the first direction; the second support beam is arranged in the accommodation cavity and extends along the second direction, the second direction intersects the first direction, and the second support beam is close to At least part of the side of the side frame is in contact with the side frame, a gap is provided on the top surface of the second support beam away from the bottom plate, and the end of the first support beam is located in the gap; the connector fixedly connects the first support beam and the second support beam . The first support beam and the second support beam of the battery box are easy to install and have strong structural strength.

Description

Battery box and battery device

Technical field

The present disclosure relates to the field of battery technology, and in particular, to a battery box and a battery device including the battery box.

Background technique

Currently, the first support beam and the second support beam in the battery box are arranged to intersect. There is a structure in which one of the first support beam and the second support beam is divided into two sections and connected to the other. This connection structure The strength is not easy to ensure; there is also a structure in which a recess is provided on the side of the second support beam away from the side frame, and then the first support beam is inserted into the fixed structure. This connection structure is inconvenient to install.

It should be noted that the information disclosed in the above background section is only used to enhance understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art.

Utility model content

The purpose of this disclosure is to overcome the above-mentioned disadvantages of the first support beam and the second support beam of the related art being inconvenient to install, and to provide a battery box in which the first support beam and the second support beam are convenient to install, and a battery device including the battery box. .

According to one aspect of the present disclosure, a battery box is provided, including:

base plate;

The side frame is arranged around the base plate and forms a receiving cavity with the base plate;

The first support beam is located in the receiving cavity and extends along the first direction;

The second support beam is provided in the accommodation cavity and extends along the second direction. The second direction intersects the first direction. At least part of the side of the second support beam close to the side frame abuts the side frame. The second support beam faces away from the side frame. A gap is provided on the top surface of the base plate, and the end of the first support beam is located in the gap;

A connecting piece fixedly connects the first support beam and the second support beam.

In the battery box of the present disclosure, on the one hand, since at least part of the side of the second support beam close to the side frame abuts the side frame, the second support beam and the side frame jointly form a support structure extending in the second direction, even in the second support beam. A gap is provided on the top surface of the second support beam away from the bottom plate. The gap has little effect on the strength of the support structure to ensure the overall strength of the battery box. On the other hand, the first support beam can be directly inserted into the gap from the top side of the second support beam, and the end of the first support beam can be located in the gap, with respect to the opening on the side of the second support beam away from the side frame. The structure of the recessed portion facilitates the installation of the first support beam and the second support beam. On the other hand, the first support beam and the second support beam are fixedly connected as one body through the connector, which increases the structural strength of the first support beam and the second support beam to ensure the overall structural strength of the battery box.

According to another aspect of the present disclosure, a battery device is provided, including:

The battery box is the battery box mentioned above;

At least two single cells are arranged in the battery box, and at least two single cells are arranged along the first direction.

In the battery device of the present disclosure, on the one hand, since at least part of the side of the second support beam close to the side frame abuts the side frame, the second support beam and the side frame jointly form a support structure extending in the second direction, even in the second support beam. A gap is provided on the top surface of the second support beam away from the bottom plate. The gap has little effect on the strength of the support structure to ensure the overall strength of the battery box and the safety of the battery device. On the other hand, the first support beam can be directly inserted into the gap from the top side of the second support beam, and the end of the first support beam can be located in the gap, with respect to the opening on the side of the second support beam away from the side frame. The structure of the recessed portion facilitates the installation of the first support beam and the second support beam, and improves the installation efficiency of the battery device. On the other hand, the first support beam and the second support beam are fixedly connected as a whole through the connector, which increases the structural strength of the first support beam and the second support beam to ensure the overall structural strength of the battery box and ensure the safety of the battery device. safety.

It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic three-dimensional structural diagram of an exemplary embodiment of a battery box of the present disclosure.

FIG. 2 is a schematic structural diagram of the first support beam, the second support beam and the connecting piece in FIG. 1 .

Figure 3 is a schematic structural diagram of another exemplary embodiment of the cooperation of the first support beam, the second support beam and the connecting piece.

Figure 4 is a schematic three-dimensional structural diagram of the connecting member in Figure 1.

FIG. 5 is a schematic structural diagram of an exemplary embodiment of the battery device of the present disclosure.

Explanation of reference symbols:

1. Bottom plate; 2. Side frame;

3. The first support beam; 31. The first part; 32. The second part;

4. Second support beam; 41, notch; 41a, slot;

5. Connecting piece; 51. First connecting part; 52. Second connecting part; 53. First fixing part; 54. Second fixing part; 55. Recessed part;

6. Welding connection part;

10. Battery box; 20. Single battery;

X, first direction; Y, second direction; Z, third direction.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments. To those skilled in the art. The same reference numerals in the drawings indicate the same or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification only for convenience. For example, according to the drawings, direction of the example described. It will be understood that if the icon device were turned upside down, components described as "on top" would become components as "on bottom". When a structure is "on" another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" placed on the other structure, or that the structure is "indirectly" placed on the other structure through another structure. on other structures.

The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "include" and "have" are used to indicate an open-ended are inclusive and mean that there may be additional elements/components/etc. in addition to those listed; the terms "first", "second", "third" etc. are only Used as a marker, not a limit on the number of its objects.

In this application, unless otherwise clearly stated and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or a detachable connection. Can be connected indirectly through intermediaries. "And/or" is just an association relationship that describes related objects. It means that there can be three relationships. For example, A and/or B can mean: A alone exists, A and B exist simultaneously, and B alone exists. situation. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

Example embodiments of the present disclosure provide a battery box 10. Referring to FIGS. 1-4, the battery box 10 may include a bottom plate 1, a side frame 2, a first support beam 3, a second support beam 4, and a connector 5. ; The side frame 2 is arranged around the base plate 1 and forms a receiving cavity with the base plate 1; the first support beam 3 is provided in the receiving cavity and extends along the first direction X; the second supporting beam 4 is provided in the receiving cavity, And extends along the second direction Y, the second direction Y intersects the first direction A notch 41 is provided on the surface, and the end of the first support beam 3 is located in the notch 41; the connecting piece 5 fixedly connects the first support beam 3 and the second support beam 4.

In the battery box 10 and battery device of the present disclosure, on the one hand, since at least part of the side of the second support beam 4 close to the side frame 2 abuts the side frame 2, the second support beam 4 and the side frame 2 jointly form a shape along the second For the support structure extending in the direction Y, even if a notch 41 is provided on the top surface of the second support beam 4 away from the bottom plate 1, the notch 41 has little effect on the strength of the support structure to ensure the overall strength of the battery box 10 and the safety of the battery device. sex. On the other hand, the first support beam 3 can be directly inserted into the notch 41 from the top side of the second support beam 4 , and the end of the first support beam 3 can be located in the notch 41 , with respect to the second support beam 4 facing away from the gap 41 . The groove structure is provided on one side of the side frame 2 to facilitate the installation of the first support beam 3 and the second support beam 4 and improve the installation efficiency of the battery device. On the other hand, the first support beam 3 and the second support beam 4 are fixedly connected as a whole through the connector 5 , which increases the structural strength of the first support beam 3 and the second support beam 4 to ensure the overall structure of the battery box 10 strength to ensure the safety of the battery device.

In this example embodiment, referring to FIG. 1 , the battery box 10 may include a bottom plate 1 , a protective cover (not shown in the figure) and a side frame 2 . The bottom plate 1 and the protective cover may be arranged in a rectangular shape. The side frame 2 is arranged around the base plate 1. Specifically, the side frame 2 is provided around the base plate 1. The side frame 2 is connected end to end to form a rectangular frame. A protective cover is provided on the opposite side of the side frame 2. The protective cover Set opposite to base plate 1. The bottom plate 1 , the protective cover and the side frame 2 surround and form a receiving cavity of the battery box 10 .

Of course, in other example embodiments of the present disclosure, the bottom plate 1 and the protective cover can be arranged in a circle, an ellipse, a trapezoid, etc., and the side frames 2 can be arranged in one or more shapes, and surround them to form a circle, an ellipse, a trapezoid, or the like. trapezoid, etc., so that the battery box 10 is formed into a cylindrical shape, an elliptical cylindrical shape, a prism shape, etc. The battery box 10 body can also have other shapes, which will not be described in detail here. Moreover, the battery box 10 may not include a protective cover. For example, when multiple battery devices are stacked one on top of another, the battery device located below may not be provided with a protective cover, and only the battery device located on the top may be provided with a protective cover, and the upper one may be provided with a protective cover. The bottom plate 1 of the battery device can serve as a protective cover for the battery device below.

In this exemplary embodiment, a first support beam 3 and a second support beam 4 are provided in the accommodation cavity. The first support beam 3 extends along the first direction X, and the second support beam 4 extends along the second direction Y. The two directions Y intersect the first direction X. Specifically, the second direction Y is perpendicular to the first direction X. The accommodating cavity can be divided into at least two sub-accommodating cavities by the first support beam 3, and a battery pack is arranged in one sub-accommodating cavity.

Both the first support beam 3 and the second support beam 4 are configured as hollow structures, that is, the first support beam 3 has a cavity, and the cavity of the first support extends along the first direction X; the second support beam 4 also has a cavity, The cavity of the second support extends along the second direction Y; making the first support beam 3 and the second support beam 4 lighter in weight to increase the energy density of the battery device; and ensuring that the first support beam 3 and the second support beam are The structural strength of the beam 4 is to ensure the overall structural strength of the battery box 10.

The second support beam 4 can be disposed close to the side frame 2, and at least part of the side of the second support beam 4 close to the side frame 2 abuts the side frame 2. For example, the entire side of the second support beam 4 close to the side frame 2 can be To contact the side frame 2 , a part of the side of the second support beam 4 close to the side frame 2 may also be in contact with the side frame 2 . Such arrangement makes the second support beam 4 and the side frame 2 jointly form a shape along the second direction Y. The extended support structure makes the support structure stronger.

Compared with "connection", "butt" emphasizes the existence of force between the two; that is, "butt" reflects the state of force between the second support beam 4 and the side frame 2 .

In this exemplary embodiment, as shown in FIG. 3 , a notch 41 is provided on the top surface of the second support beam 4 away from the base plate 1 , and the notch 41 is provided toward the first support beam 3 , so that the notch 41 has two different orientations. The first opening and the second opening are connected, the first opening is arranged away from the base plate 1, and the second opening is arranged towards the first support beam 3, so that the first support beam 3 can be connected from the second support beam 3. The top side of the beam 4 is directly inserted into the notch 41, and the end of the first support beam 3 can be located in the notch 41. Compared with the structure in which a recess is provided on the side of the second support beam 4 away from the side frame 2, it is convenient to first To install the support beam 3 and the second support beam 4, specifically, the second support beam 4 can be installed in the accommodation cavity first, and then the first support beam 3 can be directly inserted into the gap from the top side of the second support beam 4. 41, and the first support beam 3 and the second support beam 4 are fixedly connected through the connector 5. As for the structure where a recessed portion is provided on the side of the second support beam 4 away from the side frame 2, the first support beam 3 and the second support beam 4 need to be fixedly connected and then installed into the accommodation cavity as a whole. Since the first support beam 3 and the second support beam 4 are The second support beam 4 has a large structure and is not easy to move, and is prone to deformation during movement.

Moreover, since at least part of the side of the second support beam 4 close to the side frame 2 is in contact with the side frame 2, the second support beam 4 and the side frame 2 jointly form a support structure extending along the second direction Y, so that even in the second The support beam 4 is provided with a notch 41 , which has little effect on the strength of the support structure to ensure the overall strength of the battery box 10 .

The connecting piece 5 fixedly connects the first supporting beam 3 and the second supporting beam 4. Through the connecting piece 5, the first supporting beam 3 and the second supporting beam 4 are fixedly connected as one body, and the first supporting beam 3 and the second supporting beam are added. 4 structural strength to ensure the overall structural strength of the battery box 10.

Further, as shown in FIG. 2 , the notch 41 may be a through groove 41 a penetrating the second support beam 4 in the first direction X. There are no closed grooves at both ends, which can be called through grooves 41a. The through groove 41a penetrates the second support beam 4 in the first direction X, so that both ends of the through groove 41a in the first direction X are not closed. The formation of the through groove 41 a is simpler than the formation of the notch 41 , thus facilitating the preparation of the second support beam 4 . Moreover, the through groove 41a allows the end surface of the first support beam 3 perpendicular to the first direction X and the side surface of the second support beam 4 close to the side frame 2 to be substantially coplanar. The longer overlap length further increases the connection strength between the first support beam 3 and the second support beam 4 .

In this example embodiment, as shown in FIGS. 2-4 , the connector 5 may include a first connection part 51 and a second connection part 52 . The first connecting part 51 is inserted into the cavity of the first supporting beam 3 , and the first connecting part 51 is fixedly connected to the first supporting beam 3 . The second connecting part 52 is connected to the first connecting part 51 , and the second connecting part 52 is fixed to the second support beam 4 .

Referring to FIG. 3 , when the notch 41 is provided on the second support beam 4 , a through hole can be provided on the top surface of the first support beam 3 away from the bottom plate 1 , and the through hole is connected to the top surface of the first support beam 3 . The first connecting part 51 is inserted into the mold cavity of the first support beam 3 through the through hole, and the first connecting part 51 is inserted into the mold cavity of the first support beam 3 along the third direction Z. The first connecting part 51 may be provided in a block shape that is adapted to the mold cavity of the first support beam 3 . The second connection part 52 is connected to the side of the first connection part 51 away from the first support beam 3 , and the second connection part 52 is located on the top surface of the first support beam 3 and the second support beam 4 . The second connection part 52 is provided Is plate-shaped.

In this case, the connecting member 5 may also include a second fixing member 54 , and the second fixing member 54 is fixedly connected to the second support beam 4 and the second connecting part 52 . The second fixing member 54 may be a bolt, a screw, a rivet, or the like. Since the two side surfaces of the first support beam 3 in the second direction Y are in contact with the two side surfaces of the notch 41 in the second direction Y, the first support beam 3 is limited in the second direction Y. At least one end surface of the first support beam 3 in the first direction X abuts against the end surface of at least one notch 41 in the first direction X, that is, at least one end of the first support beam 3 is limited in the first direction X. The first support beam 3 can be limited in the third direction Z through the second fixing part 54 and the second connecting part 52 . The third direction Z is perpendicular to both the first direction X and the second direction Y.

Referring to FIGS. 2 and 4 , in the case where the notch 41 is configured to pass through the slot 41 a of the second support beam 4 in the first direction X, since the second support beam 4 does not block the end of the first support beam 3 , so that the end of the mold cavity of the first support beam 3 is exposed, and the first connection part 51 is inserted into the cavity of the first support beam 3 through the end of the first support beam 3, that is, the first connection part 51 is inserted along the first support beam 3. One direction X is inserted into the cavity of the first support beam 3 . The first connecting part 51 may be provided in a block shape that is adapted to the mold cavity of the first support beam 3 . The second connecting part 52 is connected to the side of the first connecting part 51 facing away from the accommodating cavity. That is, the second connecting part 52 is located on the side of the first support beam 3 and the second supporting beam 4 facing away from the accommodating cavity. The second connecting part 52 is configured as Platy.

In this case, the connecting member 5 may also include a first fixing member 53 and a second fixing member 54. The first fixing member 53 is fixedly connected to the first support beam 3 and the first connecting part 51; specifically, the first fixing member 53 53 penetrates through the through hole on the top of the first support beam 3 and is threadedly fitted into the threaded hole on the first connecting part 51 . The second fixing part 54 is fixedly connected to the second support beam 4 and the second connecting part 52. Specifically, the second fixing part 54 penetrates through the through hole on the second connecting part 52 and is threadedly fitted on the near side of the second supporting beam 4. Threaded hole on side 2 of frame. The first fixing member 53 may be a bolt, a screw, a rivet, or the like.

Since the two side surfaces of the first support beam 3 in the second direction Y are in contact with the two side surfaces of the through groove 41a in the second direction Y, the first support beam 3 is limited in the second direction Y. At least one end surface of the first support beam 3 in the first direction X abuts against the second connecting portion 52 , that is, at least one end of the first support beam 3 is limited in the first direction X. The first support beam 3 can be limited in the third direction Z through the first connecting part 51 and the first fixing part 53 .

Of course, in some other example implementations of the present disclosure, the first fixing member 53 may not be provided, and the first fixing member 53 may be inserted into the cavity of the first support beam 3 only through the first connecting part 51 to achieve the first fixing in the third direction Z. The support beam 3 is limited.

Insert the first connecting part 51 of the connecting piece 5 into the cavity of the first support beam 3 so that the first connecting part 51 does not need to occupy additional space in the battery box 10 , which is beneficial to improving the space utilization of the battery box 10 .

Of course, in some other example embodiments of the present disclosure, the first connecting portion 51 can also be provided in a plate shape, and the first connecting portion 51 can also be provided on the side of the first support beam 3 away from the bottom plate 11 .

Referring to FIG. 4 , the first connecting portion 51 of the connecting piece 5 is arranged in a block shape, and a recessed portion 55 is provided on the first connecting portion 51 . Specifically, a portion of the first connecting portion 51 that does not require a threaded hole is provided. A recessed portion 55 can be provided, and the recessed portion 55 can reduce the weight of the first connecting portion 51 , thereby reducing the weight of the connecting piece 5 to increase the energy density of the battery device.

Referring to FIG. 1 , the battery box 10 may further include a welded connection part 6 connected to the first support beam 3 and the side wall of the notch 41 . That is, the first support beam 3 and the second support beam 4 are fixedly connected by welding. Specifically, the welded connection part 6 can be formed by butt welding; through the welded connection part 6, the first support beam 3 and the second support beam can be further increased. The strength of the connection between beams 4.

The welded connection part 6 may be provided as a semi-enveloping structure surrounding the notch 41 .

In the case where the notch 41 is provided as a through-slot 41a penetrating the second support beam 4 in the first direction Opposite sides of the two directions Y.

Referring to FIG. 1 , in the third direction Z, the height of the second support beam 4 is less than the height of the side frame 2 . Specifically, the ratio of the height of the second support beam 4 to the height of the side frame 2 is greater than or equal to 0.6 and less than or equal to 0.6. 0.8, for example, the ratio of the height of the second support beam 4 to the height of the side frame 2 may be 0.63, 0.65, 0.68, 0.7, 0.72, 0.75, 0.77, etc. The third direction Z is perpendicular to both the first direction X and the second direction Y.

If the ratio of the height of the second support beam 4 to the height of the side frame 2 is too large, causing the height of the second support beam 4 to be too high, since the side frame 2 needs to be fixedly connected to the protective cover, the height of the second support beam 4 will be too high. It will interfere with the protective cover and affect the fixed connection between the side frame 2 and the protective cover.

If the ratio of the height of the second support beam 4 to the height of the side frame 2 is too small, the height of the second support beam 4 is too low, and the strength of the second support beam 4 is also too low, which cannot meet the strength requirements of the battery box 10 .

The above ratio range not only prevents the second support beam 4 from interfering with the protective cover and does not affect the fixed connection between the side frame 2 and the protective cover; the strength of the second support beam 4 is sufficient to meet the strength requirements of the battery box 10 .

Referring to FIG. 1 , the first support beam 3 may include a first part 31 and a second part 32 ; both the first part 31 and the second part 32 extend along the first direction X, and one end of the second part 32 is connected to the first part 31 . At least part of the second part 32 is located in the notch 41; for example, the entire second part 32 may be located in the notch 41, or a part of the second part 32 facing away from the first part 31 may be located in the notch 41.

In the third direction Z, the height of the first part 31 is greater than the height of the second part 32 , that is, the height of the first part 31 is set higher, so that the side of the first part 31 facing away from the bottom plate 1 is higher than the side of the second part 32 facing away from the bottom plate 1 On the other hand, to ensure the structural strength of the first support beam 3 and thus the structural strength of the battery box 10 .

Furthermore, since the second part 32 is close to the first support beam 3 , the second part 32 that is too high will interfere with the protective cover and affect the fixed connection between the side frame 2 and the protective cover. Therefore, the second part 32 is away from the base plate 1 One side is substantially coplanar with the side of the second support beam 4 facing away from the base plate 1 , that is, the height of the second portion 32 is substantially the same as the height of the second support beam 4 . It avoids interference between the first support beam 3 and the protective cover, and prevents the first support beam 3 from affecting the fixed connection between the side frame 2 and the protective cover; it also ensures the structural strength of the second part 32, thereby ensuring the structural strength of the first support beam 3. .

It should be noted that coplanarity is not limited to coplanarity in the strict sense, but can also have a certain error, that is, there can be a certain step difference between the two surfaces. Depending on the equipment and preparation process, the error range is also different. Therefore, within the error range of the equipment and preparation process, it is considered to be coplanar.

Of course, in some example embodiments of the present disclosure, the side of the second part 32 facing away from the bottom plate 1 may be slightly higher than the side of the second support beam 4 facing away from the bottom plate 1 , or the side of the second part 32 facing away from the bottom plate 1 may be slightly lower. On the side of the second support beam 4 facing away from the base plate 1 .

In the first direction , 0.13, 0.15, 0.18 and so on.

If the ratio of the length of the second part 32 to the length of the first part 31 is too large, the length of the second part 32 is too long, which reduces the structural strength of the first support beam 3 and makes the first support beam 3 unable to meet the requirements of the battery box. 10 structural strength requirements.

If the ratio of the length of the second part 32 to the length of the first part 31 is too small, so that the length of the second part 32 is too short, the first support beam 3 will still interfere with the protective cover, causing the first support beam 3 to affect the side frame. 2 Fixed connection with the protective cover;

The above ratio range not only ensures the structural strength of the first support beam 3 and thus the structural strength of the battery box 10; it also ensures that the first support beam 3 will not interfere with the protective cover and will not affect the fixation of the side frame 2 and the protective cover. connect.

Based on the same inventive concept, exemplary embodiments of the present disclosure provide a battery device. Referring to FIG. 5 , the battery device may include a battery box 10 and a single battery 20 . The battery box 10 is the battery box 10 described in any one of the above. ; The specific structure of the battery box 10 has been described in detail above, so it will not be described again here. There are at least two single cells 20 disposed in the battery box 10 , at least two single cells 20 are arranged along a first direction, and the second support beam is in contact with one of the arrangement directions of the single cells 20 . side, so that the single battery 20, the second support beam and the side frame are in contact at one time.

The "parallel" and "perpendicular" mentioned in this application can not only be completely parallel or perpendicular, but also can have a certain error; for example, the angle between the two is greater than or equal to 0° and less than or equal to 5°, that is, The two are considered to be parallel to each other; the angle between the two is greater than or equal to 85° and less than or equal to 95°, that is, the two are considered to be perpendicular to each other.

Other embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure that follow the general principles of the disclosure and include common knowledge or customary technical means in the technical field that are not disclosed in the disclosure. . It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (11)

1. A battery box, characterized in that it includes: base plate; Side frames surround the base plate and form a receiving cavity with the base plate; A first support beam is provided in the accommodation cavity and extends along the first direction; A second support beam is provided in the accommodation cavity and extends along a second direction that intersects the first direction. At least part of the side of the second support beam close to the side frame is connected to the second support beam. The side frames are in contact with each other, a gap is provided on the top surface of the second support beam away from the bottom plate, and the end of the first support beam is located in the gap; A connecting piece fixedly connects the first support beam and the second support beam. 2. The battery box according to claim 1, wherein the notch is a through groove penetrating the second support beam in the first direction. 3. The battery box according to claim 1, characterized in that the connecting piece includes: A first connecting part is inserted into the cavity of the first support beam and is fixedly connected to the first support beam; The second connecting part is connected to the first connecting part and fixed to the second support beam. 4. The battery box according to claim 3, characterized in that the notch is a through groove penetrating the second support beam in the first direction, and the first connecting portion extends along the first direction. Insert into the mold cavity of the first support beam, and the second connecting part is fixed on the side of the second support beam close to the side frame. 5. The battery box according to claim 3, characterized in that the connector further includes: A first fixing member, fixedly connected to the first support beam and the first connection part; and/or The second fixing member is fixedly connected to the second support beam and the second connecting part. 6. The battery box according to claim 1, characterized in that the battery box further includes: A welded connection part is connected to the first support beam and the side wall of the notch. 7. The battery box according to any one of claims 1 to 6, wherein in the third direction, the ratio of the height of the second support beam to the height of the side frame is greater than or equal to 0.6 and less than or equal to 0.8. , the third direction is perpendicular to both the first direction and the second direction. 8. The battery box according to any one of claims 1 to 6, characterized in that the first support beam includes: first part; a second part, one end of the second part is connected to the first part, at least part of the second part is located in the gap; in the third direction, the height of the first part is greater than the height of the second part high. 9. The battery box according to claim 8, wherein a side of the second part facing away from the bottom plate is coplanar with a side of the second support beam facing away from the bottom plate. 10. The battery box according to claim 8, wherein in the first direction, the ratio of the length of the second part to the length of the first part is greater than or equal to 0.04 and less than or equal to 0.2. 11. A battery device, characterized in that it includes: The battery box is the battery box according to any one of claims 1 to 10; At least two single cells are arranged in the battery box, and at least two of the single cells are arranged along the first direction.