CN220324607U - Box and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a box body and a battery pack, wherein the box body comprises: a first beam and a second beam; the overlapping area of the first beam and the second beam is provided with a mounting groove which is suitable for accommodating a connecting piece, and the first connecting piece penetrates through and connects the first beam and the second beam along a third direction; the second beam is provided with a cavity along the second direction, the cavity is communicated with the mounting groove, the second connecting piece at least partially penetrates into the cavity and is fixedly connected with the second beam, and the other partial area of the second connecting piece is fixedly connected with the first beam. According to the box body provided by the utility model, the first beam and the second beam are fixed together by adopting the first connecting piece and the second connecting piece, so that the connection strength of the first beam and the second beam is ensured, welding reinforcement is not required at the joints of the corners of the two beams, the problem that welding can cause interference to a battery is avoided, the battery is conveniently arranged, and the situation that the battery is stressed to deform or even be damaged due to extrusion caused by the welding can be avoided.

Description

Box and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a box body and a battery pack.

Background

The battery box body is generally provided with a cross beam and a longitudinal beam, the cross beam and the longitudinal beam are enclosed to form a battery compartment, and the battery compartment is internally used for accommodating batteries. Because the cross beam and the longitudinal beam need to be connected and fixed, in the related art, the cross beam and the longitudinal beam are often connected and fixed through connecting pieces, and welding can be performed at joints of the cross beam and the longitudinal beam.

However, as the battery is placed in the battery compartment and needs to be tightly abutted against the cross beam and the longitudinal beam, the welding and printing of the cross beam and the longitudinal beam at the joint can cause interference to the arrangement of the battery, and the convex welding and printing can easily cause extrusion to the battery, so that the battery is stressed to deform or even break.

Disclosure of Invention

In view of the above, the utility model provides a box body and a battery pack, which are used for solving the problem that welding marks are arranged at joints of a cross beam and a longitudinal beam to easily cause interference to a battery.

In a first aspect, the present utility model provides a case comprising:

a first beam extending in a first direction, and a second beam extending in a second direction and disposed at an angle to the first direction;

the first beam is provided with a yielding groove along a second direction, the second beam is provided with a plug-in part in a protruding manner along the second direction, and the plug-in part is in plug-in fit with the yielding groove;

the overlapping area of the first beam and the second beam is further provided with a mounting groove which is suitable for accommodating a connecting piece, the mounting groove is formed by recessing the second beam along a third direction, and the third direction is perpendicular to a plane defined by the first direction and the second direction;

the connecting piece comprises a first connecting piece and a second connecting piece, the first connecting piece penetrates through and connects the first beam and the second beam along a third direction, and at least part of the first connecting piece is positioned in the mounting groove;

the second beam is provided with a cavity along a second direction, the cavity is communicated with the mounting groove, the second connecting piece passes through the mounting groove and at least partially penetrates into the cavity, the second connecting piece is fixedly connected with the second beam, and a part of the second connecting piece is fixedly connected with the first beam.

The beneficial effects are that: according to the box body provided by the utility model, the first connecting piece is adopted to realize primary fixing of the first beam and the second beam, and the second connecting piece is adopted to realize secondary fixing of the first beam and the second beam, so that further reinforcement is realized, the connection strength of the first beam and the second beam can be ensured, welding reinforcement is not required to be carried out on joints at the corners of the two beams, the problem that the welding can cause interference to a battery is avoided by canceling the welding, the arrangement of the battery is facilitated, and the situation that the battery is deformed or even damaged due to stress caused by extrusion of the welding to the battery is avoided.

In a second aspect, the present utility model also provides a battery pack comprising:

a battery;

and a case as described above adapted to house the battery.

Because the battery pack includes the case, it has the same effect as the case, and is not described herein.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the case of the present utility model;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a partial schematic view of a case with a second fastener in a separated state according to the present utility model;

FIG. 4 is an exploded view of the case of the present utility model;

FIG. 5 is a schematic view of a second fastener of the present utility model;

fig. 6 is a sectional view of the present utility model in an exploded state perpendicular to the extension direction of the second beam;

fig. 7 is a cross-sectional view of the present utility model perpendicular to the direction of extension of the second beam.

Reference numerals illustrate:

1. a first beam; 11. a relief groove; 12. a fixing plate;

2. a second beam; 21. a plug-in part; 22. a mounting groove; 23. a first connection plate; 24. a reinforcing plate; 25. a second connecting plate;

4. a first connector; 121. a via hole; 5. a gasket;

6. a second connector; 61. an extension; 62. a lap joint; 63. a support part; 64. an avoidance unit;

7. a first fixing member; 111. a first fixing hole; 621. a third fixing hole;

8. a second fixing member; 211. a second fixing hole; 611. and a fourth fixing hole.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Under the condition that the current battery pack pursues long endurance, the number of batteries in the battery pack is gradually increased, the weight of the batteries is gradually increased, the requirements on the strength of the box body are higher, and the requirements on the connection strength of the cross beam and the longitudinal beam are also higher. In the related art, the cross beam and the longitudinal beam are often connected and fixed through a connecting piece, and welding can be performed at the joint of the cross beam and the longitudinal beam. However, as the battery is placed in the battery compartment and needs to be tightly abutted against the cross beam and the longitudinal beam, the welding and printing of the cross beam and the longitudinal beam at the joint can cause interference to the arrangement of the battery, and the convex welding and printing can easily cause extrusion to the battery, so that the battery is stressed to deform or even break.

The box body provided by the embodiment of the utility model adopts a double reinforcement mode, and the reinforcement position and the battery are not interfered, so that the welding mark can be canceled, the connection strength can be effectively ensured, and the requirement of the connection strength of the cross beam and the longitudinal beam can be met.

Embodiments of the present utility model are described below with reference to fig. 1 to 7.

According to an embodiment of the present utility model, in one aspect, there is provided a case including:

a first beam 1 extending in a first direction, and a second beam 2 extending in a second direction and arranged at an angle to the first direction;

the first beam 1 is provided with a yielding groove 11 along a second direction, the second beam 2 is provided with a plug-in part 21 in a protruding manner along the second direction, and the plug-in part 21 is in plug-in fit with the yielding groove 11;

the overlapping area of the first beam 1 and the second beam 2 is further formed with a mounting groove 22 adapted to accommodate a connecting piece, the mounting groove 22 is recessed from the second beam 2 along a third direction, and the third direction is perpendicular to a plane defined by the first direction and the second direction;

the connecting piece comprises a first connecting piece 4 and a second connecting piece 6, the first connecting piece 4 penetrates through and connects the first beam 1 and the second beam 2 along a third direction, and the first connecting piece 4 is at least partially positioned in the mounting groove 22;

the second beam 2 is provided with a cavity along a second direction, the cavity is communicated with the mounting groove 22, the second connecting piece 6 penetrates into the cavity at least partially through the mounting groove 22, the second connecting piece 6 is fixedly connected with the second beam 2, and a part of the second connecting piece 6 is fixedly connected with the first beam 1.

Alternatively, the first beam 1 is arranged perpendicular to the second beam 2, i.e. the first direction is perpendicular to the second direction.

The first beam 1 is formed with a yielding groove 11 along the local depression of the second direction, and the yielding groove 11 formed by the depression of the first beam 1 is shown in combination with fig. 4, so that the second beam 2 and the first beam 1 can be conveniently inserted and matched, and the first beam 1 and the second beam 2 can be conveniently and fixedly connected.

Optionally, the yielding groove 11 does not completely penetrate through the first beam 1 along the second direction, and the yielding groove 11 does not completely penetrate through the first beam 1 along the third direction, so that after the second beam 2 is in plug-in fit with the first beam 1, an area for fixing the two beams can be reserved.

The second beam 2 is formed with a plug portion 21 protruding in the second direction, and optionally, the shape of the plug portion 21 is matched with the shape of the relief groove 11. After the plugging portion 21 is plugged and matched with the yielding groove 11, at least part of the area of the first beam 1 and the area of the second beam 2 are overlapped.

In order to be convenient for first roof beam 1 with the connection of second roof beam 2 is fixed first roof beam 1 go up and with the overlapping area of second roof beam 2 is formed with mounting groove 22, through setting up the installed part in mounting groove 22, can reserve the installation space for the installed part, conveniently to first roof beam 1 with second roof beam 2 is fixed, and can avoid the installed part to occupy the more Z to the space of box, is favorable to improving the space utilization of box, and wherein, Z to can be parallel with the third direction.

The mounting groove 22 is formed by recessing the second beam 2 along the third direction, so that the space occupied by the connecting piece along the third direction is conveniently contained.

The connection and fixation of the first beam 1 and the second beam 2 can be achieved by providing connectors, and in particular, the connectors comprise a first connector 4 and a second connector 6.

Optionally, the first connecting piece 4 and the second connecting piece 6 have partial structures and are accommodated in the mounting groove 22, so that the space in the mounting groove 22 can be reasonably utilized, and the space occupation along the third direction is reduced.

The first connecting piece 4 penetrates through and connects the first beam 1 and the second beam 2 in sequence along the third direction, and the first beam 1 and the second beam 2 can be initially fixed along the third direction by fixing the first beam 1 and the second beam 2, and the pre-positioning function is achieved for the subsequent fixing of the second connecting piece 6.

Alternatively, the first connecting member 4 may be a bolt or a rivet.

Optionally, as shown in fig. 3, when the first connecting piece 4 is a bolt, the end of the bolt is accommodated in the mounting groove 22, so that the head of the bolt is prevented from exceeding the top of the first beam 1 or the second beam 2, and the Z-directional space is prevented from being occupied.

The second beam 2 is configured as a thin-walled square tubular structure, a cavity is formed in the second beam 2 along a second direction, the cavity is communicated with the mounting groove 22, and the second connecting piece 6 at least partially penetrates into the cavity, so that the second connecting piece 6 can be fixedly connected with the top surface of the second beam 2 by means of a fixing piece. Meanwhile, the second connecting piece 6 is fixedly connected with the first beam 1 in another partial area, so that the first beam 1 or the second beam 2 is fixed by the second connecting piece 6.

According to the box body provided by the embodiment of the utility model, the first connecting piece 4 is adopted to realize primary fixing of the first beam 1 and the second beam 2, and the second connecting piece 6 is adopted to realize secondary fixing of the first beam 1 and the second beam 2, so that further reinforcement is realized, the connection strength of the first beam 1 and the second beam 2 can be ensured, welding reinforcement is not required to be carried out at joints at the corners of the two beams, the problem that welding can cause interference to a battery is avoided by canceling welding, the arrangement of the battery is facilitated, and the situation that the battery is deformed or even damaged due to stress caused by extrusion of the welding to the battery is avoided.

In the specific installation process, the plugging part 21 is plugged and matched with the yielding groove 11 to realize the opposite plugging and positioning of the first beam 1 and the second beam 2, and then the two beams are fixed through the first connecting piece 4; at least part of the second connecting piece 6 penetrates into the cavity, the second connecting piece 6 is fixedly connected with the top surface of the second beam 2 through the fixing piece, and the other part of the second connecting piece 6 is fixedly connected with the first beam 1, so that double fixing of the first connecting piece 4 and the second connecting piece 6 is realized, and the connection strength is ensured.

In some embodiments, as shown in fig. 1 and 2, the first beam 1 is an edge beam, the second beam 2 is an inner beam, the plugging portion 21 and the mounting groove 22 are both located at an end portion of the second beam 2 along the second direction, and the end portion abuts against the first beam 1 and at least partially overlaps with the first beam along the third direction.

Because the first beam 1 is an edge beam, the first beam 1 and the second beam 2 form a T shape after being fixed, the plugging portion 21 and the mounting groove 22 are arranged at the end portion, close to the first beam 1, of the second beam 2 along the second direction, and the first beam 1 is locally recessed along the second direction to form a yielding groove 11, so that the second beam 2 is conveniently abutted against the first beam 1, and the two beams are at least partially overlapped, so that connection and fixation can be performed.

In some embodiments, as shown in connection with fig. 7, the first connector 4 and the second connector 6 do not overlap in projection on a first plane, which is a plane perpendicular to the second direction.

By arranging that the projections of the first connecting piece 4 and the second connecting piece 6 on the first plane are not overlapped, the first connecting piece 4 can not interfere with the installation of the second connecting piece 6 when the extension part 61 of the second connecting piece is inserted into the cavity of the second beam 2, and therefore the smooth installation is ensured.

In some embodiments, as shown in connection with fig. 2, the first connector 4 and the second connector 6 are projected to overlap on a second plane, the second plane being a plane perpendicular to the third direction.

By arranging the first connecting piece 4 and the second connecting piece 6 to overlap in a projection manner on the second plane, the first connecting piece 4 and the second connecting piece 6 can be ensured to be positioned in the mounting groove 22, and space occupation is saved. Simultaneously, the second beam 2 and the first beam 1 can be fixed at a plurality of positions of the first connecting piece 4 and the second connecting piece 6 along the third direction, and the fixing firmness degree is ensured.

In some embodiments, as shown in connection with fig. 2 and 5, the second connecting member 6 includes:

a body part fixedly connected with the first beam 1;

a protruding portion 61 extending from the body portion in a second direction, the protruding portion 61 being adapted to extend into the cavity; at least one second fixing member 8 sequentially passes through and fixes the second beam 2 and the protruding portion 61 in the third direction.

The second connecting piece 6 extends along the second direction to form a protruding portion 61, and the protruding portion 61 can be at least partially overlapped with the top surface of the second beam 2 by inserting the protruding portion 61 into the cavity, so that the top surface of the second beam 2 and the protruding portion 61 can be fixedly connected through the second fixing piece 8.

Optionally, a second fixing hole 211 is formed on the top surface of the second beam 2, a fourth fixing hole 611 is formed on the protruding portion 61, and the second fixing member 8 sequentially passes through the second fixing hole 211 and the fourth fixing hole 611, so as to fix the top surface of the second beam 2 and the protruding portion 61.

Alternatively, the second fixing member 8 may be a screw or a rivet.

In some embodiments, as shown in connection with fig. 2 and 5, the second connecting member 6 further includes: and the lap joint part 62 is formed by extending at least one side of the body part along a first direction, the lap joint part 62 is abutted against the first beam 1, and at least one first fixing piece 7 sequentially passes through and fixes the lap joint part 62 and the first beam 1 along a third direction.

Alternatively, the overlapping portion 62 is formed by extending the body portion toward two sides along the first direction, the overlapping portions 62 on the two sides are respectively abutted against the first beam 1, and the overlapping portions 62 are further fixed with the first beam 1 by the first fixing member 7.

Optionally, the top surface of the first beam 1 is provided with a first fixing hole 111, the lap joint portion 62 is provided with a third fixing hole 621, and the first fixing piece 7 sequentially passes through the third fixing hole 621 and the first fixing hole 111, so as to fix the lap joint portion 62 and the first beam 1.

Alternatively, the first fixing member 7 may be a screw or a rivet.

As shown in connection with fig. 5, the second connecting member 6 is constructed in a T-shape.

And further, the overlap portion 62 and the protruding portion 61 have a height difference along the third direction, so that the overlap portion 62 is disposed above the top surface of the first beam 1 along the third direction, and the protruding portion 61 is disposed below the top surface of the second beam 2 along the third direction, so that after the second connecting piece 6 is fixed to the first beam 1 and the second beam 2, the acting force of the second beam 2 rotating around the first direction can be better resisted, and the connection strength of the second beam 2 and the first beam 1 is ensured.

In some embodiments, as shown in fig. 6 and 7, the bottom of the mounting groove 22 forms a first connection plate 23, and the first beam 1 is located relatively below the first connection plate 23 along the third direction and also forms a second connection plate 25;

the bottom of the abdication groove 11 is provided with a fixed plate 12;

the second connecting plate 25 is overlapped on the upper side of the fixing plate 12 along the third direction, and at least one first connecting piece 4 sequentially penetrates through the first connecting plate 23, the second connecting plate 25 and the fixing plate 12, so that the first beam 1 is fixedly connected with the second beam 2.

Because the beam forming the box body is usually an extruded section, a hollow cavity is formed in the beam, or only a plurality of reinforcing ribs are arranged in the beam, the weight of the beam is reduced on the basis of ensuring the structural strength of the beam.

In this embodiment, the second beam 2 and the first beam 1 are both configured as a hollow section, and the second beam 2 is internally provided with a reinforcing rib parallel to the top surface of the second beam 2, so that a first connecting plate 23 and a second connecting plate 25 fixed to the first beam 1 are formed on the plugging portion 21 of the second beam 2, and the first connecting plate 23 and the second connecting plate 25 may be formed by local areas of the reinforcing rib.

The first connector 4 is inserted through the first connector plate 23, the second connector plate 25, and the fixing plate 12 in this order, whereby the first connector 4 can connect the first beam 1 and the second beam 2.

Optionally, the side wall of the mounting groove 22 along the first direction forms a reinforcing plate 24, the reinforcing plate 24 is connected with the first connecting plate 23, and preferably, the reinforcing plate 24 can connect the first connecting plate 23 with the second connecting plate 25 into a whole, so that the structural strength of the first connecting plate 23 and the second connecting plate 25 can be enhanced, and stress deformation is avoided after the first connecting piece 4 is connected.

Optionally, a via hole 121 is formed on the fixing plate 12, and the first connecting piece 4 is adapted to pass through the via hole 121 to achieve connection and fixation between the first beam 1 and the second beam 2.

Optionally, the number of the first connectors 4 is at least two, so that when only one first connector 4 is provided after the first beam 1 and the second beam 2 are connected, the second beam 2 can be prevented from twisting around a single first connector 4.

Optionally, a spacer 5 is further arranged between the bolt head of the first connecting piece 4 and the first connecting plate 23, so that the stress area is increased, and stress cracking of the first connecting plate 23 is avoided.

In some embodiments, as shown in connection with fig. 5, the first connector 4 is at least partially received in the mounting slot 22, and the second connector 6 is disposed above the first connector 4 in a third direction;

the second connector 6 is provided with a supporting portion 63, and the supporting portion 63 abuts against the first connecting plate 23, so that the projection of the first connector 4 and the projection of the second connector 6 on the first plane are not overlapped.

Alternatively, the supporting portion 63 is formed by extending a partial area of the second connecting member 6 downward in the third direction, and in this embodiment, the supporting portion 63 is formed by extending the protruding portion 61 downward in the third direction.

The supporting portion 63 can serve to strengthen the structure of the protruding portion 61, and can abut against the first connecting plate 23, so that a gap is formed between the protruding portion 61 and the first connecting plate 23, and the projection of the first connecting member 4 and the projection of the second connecting member 6 on the first plane are not overlapped, so that the end of the first connecting member 4 can be conveniently accommodated in the region.

In some embodiments, as shown in fig. 5, the top surface of the first beam 1 in the third direction is higher than the top surface of the second beam 2 in the third direction, the supporting portion 63 extends to the protruding portion 61, the end portion of the supporting portion 63 near the second beam 2 in the second direction is formed with a relief portion 64, and the relief portion 64 is adapted to form a relief for the protruding portion 61 to fit into the cavity.

When the protruding portion 61 of the second connecting member 6 is installed in the installation groove 22 and the cavity formed in the second beam 2 along the second direction, since the top surface of the first beam 1 along the third direction is higher than the top surface of the second beam 2 along the third direction, the protruding portion 61 cannot be directly inserted into the cavity from the horizontal plane, and the protruding portion 61 needs to be inclined by a certain angle to be inserted into the cavity during insertion, it is necessary to provide the avoiding portion 64 at the end portion of the supporting portion 63 to facilitate the inclined insertion of the protruding portion 61.

Optionally, the avoiding portion 64 is an arc angle, so that when the protruding portion 61 is obliquely inserted into the cavity, the arc angle can play a guiding role, and installation of the protruding portion 61 is facilitated.

According to an embodiment of the present utility model, in another aspect, there is also provided a battery pack including:

a battery;

and a case as described above adapted to house the battery.

According to the battery pack provided by the embodiment of the utility model, the first connecting piece 4 is adopted to realize primary fixing of the first beam 1 and the second beam 2, and the second connecting piece 6 is adopted to realize secondary fixing of the first beam 1 and the second beam 2, so that further reinforcement is realized, the connection strength of the first beam 1 and the second beam 2 can be ensured, welding reinforcement is not required to be carried out at the joint of the two beam corners, the problem that the welding can cause interference to the battery is avoided by canceling the welding, the arrangement of the battery is facilitated, and the situation that the battery is deformed or even damaged due to stress caused by extrusion of the welding to the battery is avoided.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Although the embodiments of the present utility model have been described with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the claims.

Claims (10)

1. A tank, comprising:

a first beam (1) extending in a first direction, and a second beam (2) extending in a second direction and arranged at an angle to the first direction;

the first beam (1) is provided with a yielding groove (11) along a second direction, the second beam (2) is provided with a plug-in part (21) in a protruding mode along the second direction, and the plug-in part (21) is in plug-in fit with the yielding groove (11);

the overlapping area of the first beam (1) and the second beam (2) is further formed with a mounting groove (22) suitable for accommodating a connecting piece, the mounting groove (22) is formed by recessing the second beam (2) along a third direction, and the third direction is perpendicular to a plane defined by the first direction and the second direction;

the connecting piece comprises a first connecting piece (4) and a second connecting piece (6), the first connecting piece (4) penetrates through and connects the second beam (2) and the first beam (1) along a third direction, and at least part of the first connecting piece (4) is positioned in the mounting groove (22);

the second beam (2) is provided with a cavity along a second direction, the cavity is communicated with the mounting groove (22), the second connecting piece (6) passes through the mounting groove (22) and at least partially penetrates into the cavity, the second connecting piece (6) is fixedly connected with the second beam (2), and a part of the second connecting piece (6) is additionally fixedly connected with the first beam (1).

2. The box according to claim 1, characterized in that the first beam (1) is an edge beam, the second beam (2) is an inner beam, the plug-in part (21) and the mounting groove (22) are both located at an end of the second beam (2) along the second direction, and the end abuts against the first beam (1) and at least partially overlaps along the third direction.

3. The box according to claim 1, characterized in that the first connection element (4) and the second connection element (6) are projected non-overlapping on a first plane, which is a plane perpendicular to the second direction.

4. A box according to claim 3, characterized in that the first connection element (4) and the second connection element (6) overlap in projection on a second plane, which is a plane perpendicular to the third direction.

5. -the tank according to any one of claims 1 to 4, characterized in that said second connection (6) comprises:

the body part is fixedly connected with the first beam (1);

a protruding portion (61) extending from the body portion in a second direction, the protruding portion (61) being adapted to extend into the cavity; at least one second fixing member (8) sequentially passes through and fixes the second beam (2) and the protruding portion (61) in a third direction.

6. The tank according to claim 5, characterized in that said second connection (6) further comprises: and the lap joint part (62) is formed by extending at least one side of the body part along a first direction, the lap joint part (62) is abutted against the first beam (1), and at least one first fixing piece (7) sequentially passes through and fixes the lap joint part (62) and the first beam (1) along a third direction.

7. -the tank according to any one of claims 1 to 4, characterised in that the bottom of the mounting groove (22) forms a first connection plate (23), the first beam (1) being located in a third direction relatively below the first connection plate (23) and also forming a second connection plate (25);

the bottom of the abdication groove (11) forms a fixed plate (12);

the second connecting plates (25) are lapped above the fixed plates (12) along a third direction, and at least one first connecting piece (4) sequentially penetrates through the first connecting plates (23), the second connecting plates (25) and the fixed plates (12), so that the first beams (1) are fixedly connected with the second beams (2).

8. A box according to claim 3, characterized in that the first connection piece (4) is at least partially accommodated in the mounting groove (22), the second connection piece (6) being arranged above the first connection piece (4) in a third direction;

the second connecting piece (6) is provided with a supporting part (63), and the supporting part (63) is abutted with the first connecting plate (23) so that the projection of the first connecting piece (4) and the projection of the second connecting piece (6) on the first plane are not overlapped.

9. The box according to claim 8, characterized in that the top surface of the first beam (1) in the third direction is higher than the top surface of the second beam (2) in the third direction, the support portion (63) extends to an extension portion (61), the support portion (63) is formed with a relief portion (64) near the end of the second beam (2) in the second direction, and the relief portion (64) is adapted to give way for the extension portion (61) to fit into the cavity.

10. A battery pack, comprising:

a battery;

and a case as claimed in any one of claims 1 to 9 adapted to house the battery.