Box structure, battery pack and vehicle

Abstract

The utility model relates to the technical field of airtightness detection, in particular to a box structure, a battery pack and a vehicle, and the box structure comprises a box body which is provided with a battery cell accommodating cavity for accommodating a battery cell; the longitudinal beam is arranged in the battery cell accommodating cavity, an exhaust cavity is formed in the longitudinal beam, the longitudinal beam extends in the first direction, a plurality of air inlet holes which are communicated with the exhaust cavity and are used for air exhausted by an anti-explosion valve of the battery cell to enter are formed in at least one side of the longitudinal beam in the second direction, and the first direction is perpendicular to the second direction; one end of the exhaust channel is communicated with the exhaust cavity and the cell accommodating cavity, and the other end is communicated with the external space of the box body. By means of the longitudinal beams and the exhaust channels, when thermal runaway of the battery cells occurs, high-temperature gas entering the exhaust cavities of the longitudinal beams from the air inlet holes and high-temperature gas entering the gaps between the battery cells and the longitudinal beams are exhausted to the outer space of the box body through the exhaust channels, and the longitudinal beams can prevent the high-temperature gas exhausted by the battery cells from being directly sprayed to the opposite battery cells; the risk of heat spreading is reduced, and potential safety hazards are reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and particularly to a box structure, a battery pack, and a vehicle. Background Art

[0002] New energy vehicles have achieved rapid development in recent years due to their advantages such as low energy consumption, excellent driving performance, and environmental friendliness. The powertrain of new energy vehicles includes three parts: a power battery system, a motor and transmission system, and an electronic control system. Among them, the power battery system is the energy source of the whole vehicle and undertakes functions such as storing electric energy, discharging, charging, and battery management.

[0003] The battery pack in the power battery system provides power for new energy vehicles. At present, for the thermal runaway exhaust scheme of the battery pack, a special exhaust structure is generally set in the box body of the battery pack. When the battery cell has a thermal runaway, the high-temperature gas generated by it is discharged through the exhaust structure. For example, for the vertically arranged battery cells, the explosion-proof valve of the battery cell faces upward or downward, and the gap between the battery cell and the upper cover or bottom plate of the box body is used as an exhaust channel to discharge the high-temperature gas. However, for the horizontally arranged battery cells, the explosion-proof valve of the battery cell faces the side of the box body, and the high-temperature gas discharged during the thermal runaway of the battery cell is likely to spray onto the opposite battery cell and trigger the thermal runaway of other battery cells, posing a safety hazard. Utility Model Content

[0004] In order to solve the above technical problems, the present disclosure provides a box structure, a battery pack, and a vehicle.

[0005] In a first aspect, the present disclosure provides a box structure, including:

[0006] A box body having a battery cell accommodation cavity for accommodating battery cells;

[0007] A longitudinal beam disposed in the battery cell accommodation cavity. The longitudinal beam has an exhaust cavity inside, the longitudinal beam extends along a first direction, and at least one side of the longitudinal beam in a second direction is provided with a plurality of intake holes communicating with the exhaust cavity and for the gas discharged from the explosion-proof valve of the battery cell to enter. The first direction and the second direction are perpendicular to each other;

[0008] An exhaust passage, one end of which communicates with the exhaust cavity and the battery cell accommodation cavity, and the other end of which communicates with the external space of the box body.

[0009] Optionally, the box structure further includes an exhaust pipe, and the exhaust pipe is disposed in the box body, and the internal space of the exhaust pipe constitutes the exhaust passage.

[0010] Optionally, the box structure also includes a crossbeam extending along the second direction, the crossbeam dividing the inner cavity of the box body to form the electrical accommodating cavity and the electrical component accommodating cavity, and the crossbeam is provided with a first exhaust hole and a second exhaust hole that are connected, the first exhaust hole connects the exhaust cavity and the battery cell accommodating cavity, the second exhaust hole connects the exhaust pipe, and the exhaust pipe is arranged in the electrical component accommodating cavity.

[0011] Optionally, the longitudinal beam includes two plates arranged opposite to each other in the second direction, each plate being provided with a plurality of the air inlet holes, wherein a projection of any one of the air inlet holes on one of the plates on a plane perpendicular to the second direction does not overlap with a projection of a plurality of the air inlet holes on the other plate on a plane perpendicular to the second direction.

[0012] Optionally, in the third direction, the height of the longitudinal beam is greater than the height of the explosion-proof valve of the battery cell when it is arranged toward the longitudinal beam in the second direction, and the third direction, the second direction and the first direction are perpendicular to each other.

[0013] Optionally, in the third direction, the height of the longitudinal beam is smaller than the height of the battery cell.

[0014] Optionally, the box body includes a bottom plate and a side panel connected to the bottom plate, the inner cavity is formed between the bottom plate and the side panel, the side panel has an air guide cavity, and the air guide cavity connects the battery cell accommodating cavity and the exhaust channel.

[0015] Optionally, a plurality of longitudinal beams are provided, and the plurality of longitudinal beams are spaced apart in the second direction, and the exhaust passage is connected to the exhaust cavities of the plurality of longitudinal beams.

[0016] In a second aspect, the present disclosure provides a battery pack, comprising the box structure provided in the first aspect and at least one battery group, wherein the battery group comprises a plurality of battery cells arranged side by side, and the explosion-proof valves of the battery cells are arranged toward the longitudinal beam in the second direction.

[0017] In a third aspect, the present disclosure provides a vehicle, comprising the battery pack provided in the second aspect.

[0018] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0019] By providing a longitudinal beam in the battery cell accommodating cavity of the box body, the longitudinal beam has an exhaust cavity, and at least one side of the longitudinal beam in the second direction is provided with an air inlet hole communicating with the exhaust cavity. One end of the exhaust passage communicates with the exhaust cavity and the battery cell accommodating cavity, and the other end communicates with the external space of the box body. Thus, when the battery cell experiences thermal runaway, the high-temperature gas entering the exhaust cavity of the longitudinal beam through the air inlet hole and the high-temperature gas entering the gap between the battery cell and the longitudinal beam can be discharged to the external space of the box body through the exhaust passage. This not only realizes the discharge of the high-temperature gas generated by the thermal runaway of the battery cell, but also, through the blocking of the longitudinal beam, can prevent the high-temperature gas discharged from the battery cell from directly spraying onto the opposite battery cell, reducing the risk of thermal propagation, improving the safety performance of the battery pack, and reducing potential safety hazards. Brief Description of the Drawings

[0020] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0021] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of the box structure according to the embodiment of the present disclosure;

[0023] Figure 2 Top view schematic diagram of the battery pack according to the embodiment of the present disclosure;

[0024] Figure 3 Cross-sectional view schematic diagram of the battery pack according to the embodiment of the present disclosure;

[0025] Figure 4 Disassembly schematic diagram of the battery pack according to the embodiment of the present disclosure.

[0026] Among them,

[0027] 1. Box body; 11. Bottom plate; 12. Side wall panel; 101. Battery cell accommodating cavity; 102. Electrical component accommodating cavity;

[0028] 2. Longitudinal beam; 201. Exhaust cavity; 21. Plate body; 211. Air inlet hole;

[0029] 3. Exhaust pipe; 41. Second exhaust hole;

[0030] 4. Cross beam;

[0031] 10. Battery cell. Detailed Embodiments

[0032] In order to more clearly understand the above-mentioned objects, features, and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0033] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0034] As Figures 1 to 4 shown, the present disclosure provides a box structure, which includes a box body 1, a longitudinal beam 2, and an exhaust passage. Among them, the box body 1 has a battery cell accommodation cavity 101 for accommodating the battery cells 10. The longitudinal beam 2 is disposed in the battery cell accommodation cavity 101. The longitudinal beam 2 has an exhaust cavity 201 inside. The longitudinal beam 2 extends in a first direction. At least one side of the longitudinal beam 2 in a second direction is provided with a plurality of intake holes 211 communicating with the exhaust cavity 201 and through which the gas discharged from the explosion-proof valve of the battery cell 10 enters. The first direction and the second direction are perpendicular to each other. One end of the exhaust passage communicates with the exhaust cavity 201 and the battery cell accommodation cavity 101, and the other end communicates with the external space of the box body 1. Among them, the first direction is the X direction as Figure 1 shown, and the second direction is the Y direction as Figure 1 shown.

[0035] Understandably, by disposing the longitudinal beam 2 in the battery cell accommodation cavity 101 of the box body 1, the longitudinal beam 2 has an exhaust cavity 201, and at least one side of the longitudinal beam 2 in the second direction is provided with intake holes 211 communicating with the exhaust cavity 201. One end of the exhaust passage communicates with the exhaust cavity 201, and the other end communicates with the external space of the box body 1. Thus, when the battery cell 10 has a thermal runaway, the high-temperature gas discharged through the explosion-proof valve can enter the exhaust cavity 201 of the longitudinal beam 2 through the intake holes 211, and then be discharged to the external space of the box body 1 through the exhaust passage. This not only realizes the discharge of the high-temperature gas generated by the thermal runaway of the battery cell 10, but also, through the blocking of the longitudinal beam 2, can prevent the high-temperature gas discharged from the battery cell 10 from directly spraying onto the opposite battery cell 10. Moreover, a part of the high-temperature gas ejected from the battery cell 10 will enter the gap between the battery cell 10 and the longitudinal beam 2, and this part of the high-temperature gas also needs to be discharged. Therefore, one end of the exhaust passage communicating with the exhaust cavity 201 is set to communicate with the battery cell accommodation cavity 101, so that the high-temperature gas that enters the gap between the battery cell 10 and the longitudinal beam 2 after the thermal runaway of the battery cell 10 can be discharged, reducing the risk of thermal propagation, improving the safety performance of the battery pack, and reducing potential safety hazards.

[0036] That is to say, after thermal runaway occurs in the battery cell 10, a part of the high-temperature gas discharged from the battery cell 10 through its explosion-proof valve enters the exhaust cavity 201 through the intake hole 211 and is discharged through the exhaust passage, while the other part enters the gap between the battery cell 10 and the longitudinal beam 2, that is, the battery cell accommodation cavity 101, and is also discharged through the exhaust passage, which can accelerate the discharge speed of the high-temperature gas.

[0037] Further, an insulating layer is provided on the outer side of the longitudinal beam 2 to reduce the risk of short circuit. The insulating layer can be an insulating coating or an insulating structure pasted on the outer side of the longitudinal beam, and no specific limitation is made here. The insulating material can be selected according to actual needs, such as mica.

[0038] Refer to Figure 1 and Figure 2 , in some embodiments, the box body structure further includes an exhaust pipe 3, the exhaust pipe 3 is arranged in the box body 1, and the internal space of the exhaust pipe 3 constitutes the above exhaust passage. That is to say, the high-temperature gas in the exhaust cavity 201 is discharged to the external space of the box body 1 through the exhaust pipe 3. In this case, an exhaust pipe 3 that can insulate heat can be used to prevent heat from spreading to the remaining space of the box body 1.

[0039] Optionally, in some other embodiments, the above exhaust passage can be arranged on the box body 1, that is, the high-temperature gas in the exhaust cavity 201 is directly discharged through the exhaust passage on the box body 1.

[0040] Further, the exhaust pipe 3 is made of an aluminum alloy pipe, which is convenient for welding connection with the box body 1.

[0041] Further, an air outlet hole is provided on the box body 1. One end of the air outlet hole is communicated with the exhaust pipe 3, and the other end is provided with an explosion-proof valve to improve the safety of the battery pack.

[0042] Further, refer to Figure 1 and Figure 2 , the box body structure further includes a cross beam 4, the cross beam 4 extends along the second direction, the cross beam 4 divides the inner cavity of the box body 1 into a battery cell accommodation cavity 101 and an electrical component accommodation cavity 102, and a first exhaust hole and a second exhaust hole that are communicated are opened on the cross beam 4. The first exhaust hole is communicated with the exhaust cavity 201 and the battery cell accommodation cavity 101, and the second exhaust hole is communicated with the exhaust pipe 3. The exhaust pipe 3 is arranged in the electrical component accommodation cavity 102.

[0043] Understandably, the arrangement of the cross beam 4 divides the inner cavity of the box body 1 to form a battery cell accommodation cavity 101 and an electrical component accommodation cavity 102. In this way, the electrical components of the battery pack can be separated from the battery cells 10, avoiding damage to the electrical components caused by the high-temperature gas generated when the battery cells 10 undergo thermal runaway. The exhaust pipe 3 is arranged in the electrical component accommodation cavity 102, so that the high-temperature gas in the battery cell accommodation cavity 101 and the exhaust cavity 201 can be discharged without affecting the electrical components, reducing the risk of thermal propagation and electrical component short circuit.

[0044] Further, the longitudinal beam 2 includes two plate bodies 21 oppositely arranged in the second direction. A plurality of air inlet holes 211 are formed on each plate body 21. The projection of any one air inlet hole 211 on one plate body 21 in a plane perpendicular to the second direction does not coincide with the projections of the plurality of air inlet holes 211 on the other plate body 21 in a plane perpendicular to the second direction.

[0045] Understandably, any one air inlet hole 211 on one plate body 21 and the plurality of air inlet holes 211 on the other plate body 21 are not directly connected. That is, the airflow entering through any one air inlet hole 211 on one plate body 21 will first impact the other plate body 21, rather than directly impacting any one air inlet hole 211 on the other plate body 21. In this way, it can be avoided that the high-temperature gas ejected by the battery cell 10 directly impacts the opposite battery cell 10 through the other air inlet hole 211, reducing the risk of thermal propagation.

[0046] Specifically, the plurality of air inlet holes 211 on one plate body 21 are spaced in the first direction, and the plurality of air inlet holes 211 on the other plate body 21 are spaced in the first direction. Moreover, the distance between the projection of any one air inlet hole 211 on one plate body 21 in a plane perpendicular to the second direction and the projection of any one air inlet hole 211 on the other plate body 21 in a plane perpendicular to the second direction in the first direction is greater than or equal to a preset distance. The preset distance is preferably 1 mm. Of course, the preset distance can also be set according to actual needs.

[0047] Optionally, in some other embodiments, the longitudinal beam 2 can also include two plate bodies 21 oppositely arranged in the second direction. The above-mentioned air inlet holes 211 are formed on one of the plate bodies 21. That is to say, one of the plate bodies 21 is provided with air inlet holes 211, while the other plate body 21 is not provided with air inlet holes 211. At this time, the plate body 21 provided with air inlet holes 211 can face the end of the battery cell 10 with an explosion-proof valve, and the plate body 21 not provided with air inlet holes 211 can face the other end of the other battery cell 10 opposite to the end with the explosion-proof valve.

[0048] Such as Figure 2As shown, a plurality of the longitudinal beams 2 may be provided, and the plurality of longitudinal beams 2 are spaced apart in the second direction. The exhaust passage communicates with the exhaust cavities 201 of the plurality of longitudinal beams 2. With such an arrangement, the plurality of longitudinal beams 2 divide the battery cell accommodating cavity 101 into a plurality of battery pack accommodating cavities, and each battery pack accommodating cavity is used to accommodate a battery pack composed of a plurality of battery cells 10. In this way, each longitudinal beam 2 can correspond to a plurality of intake holes 211 and a plurality of battery cells 10 one by one, that is, an intake hole 211 is correspondingly provided for each battery cell 10. In this way, when a certain battery cell 10 has a thermal runaway, the high-temperature gas can be discharged in time to reduce the risk of thermal propagation. At this time, the above exhaust pipe 3 communicates with the exhaust cavity of each longitudinal beam 2.

[0049] Referring to Figure 1 and Figure 2 , the above box body 1 includes a bottom plate 11 and side wall plates 12 connected to the bottom plate 11, and an inner cavity is formed by enclosing between the bottom plate 11 and the side wall plates 12. Specifically, a cross beam 4 divides the inner cavity of the box body 1 into an electrical component accommodating cavity 102 and a battery cell accommodating cavity 101, and the above longitudinal beam 2 is arranged in the battery cell accommodating cavity 101.

[0050] Exemplarily, referring to Figure 2 , two longitudinal beams are provided, and the two longitudinal beams 2 divide the battery cell accommodating cavity 101 into three battery pack accommodating cavities. Two battery packs are accommodated in each battery pack accommodating cavity, and the explosion-proof valves of the battery cells 10 of the two battery packs are arranged back to back. For the convenience of description, the end of the battery cell 10 provided with the explosion-proof valve is defined as the first end, and the end opposite to the first end is defined as the second end. Then, for the two battery packs in each battery pack accommodating cavity, the first end of the battery cells 10 of one battery pack faces the second end of the battery cells 10 of the other battery pack. In this case, the explosion-proof valves of the battery cells 10 of the two battery packs located in the middle both face the longitudinal beam 2, while the explosion-proof valves of the battery cells 10 of two of the four battery packs located on the outside face the side wall plates. At this time, the high-temperature gas discharged when the battery cells 10 of these two battery packs have a thermal runaway directly enters the battery cell accommodating cavity 101 and can be discharged outside the box body 1 through the exhaust passage.

[0051] Optionally, in some other embodiments, the box body includes a bottom plate and a surrounding plate connected to the bottom plate. A battery cell accommodating cavity is formed by enclosing between the bottom plate and the side wall plates. A gas guiding cavity is provided in the side wall plate 12, and the gas guiding cavity communicates with the battery cell accommodating cavity 101 and the exhaust passage. With such an arrangement, when a battery cell 10 has a thermal runaway, the high-temperature gas in the battery cell accommodating cavity 101 can be discharged through the gas guiding cavity in the side wall plate 12, accelerating the discharge speed of the high-temperature gas and further improving the safety performance of the battery pack. Moreover, by providing a gas guiding cavity in the side wall plate, when the explosion-proof valves of some battery cells face the side wall plate 12, the high-temperature gas ejected by the battery cells can be discharged through the gas guiding cavity when the battery cells 10 have a thermal runaway.

[0052] It should be noted that in this embodiment, the box body structure may also include the above-mentioned exhaust pipe 3 and cross beam 4, which will not be elaborated here.

[0053] As Figure 1 and Figure 3 shown, in the third direction, the height of the longitudinal beam 2 is greater than the height of the explosion-proof valve of the battery cell 10 when the explosion-proof valve of the battery cell 10 is arranged towards the longitudinal beam 2 in the second direction. The third direction, the second direction and the first direction are perpendicular to each other in pairs. Among them, the third direction is the Z direction as Figure 4 shown, the second direction is the Y direction as Figure 4 shown, and the third direction is the X direction as Figure 4 shown.

[0054] Understandably, when the explosion-proof valve of the battery cell 10 is arranged towards the longitudinal beam 2 in the second direction, in the third direction, the height of the longitudinal beam 2 is greater than the height of the explosion-proof valve of the battery cell 10, so that when the battery cell 10 is out of thermal control, the high-temperature gas ejected by the battery cell 10 can be prevented from impacting the opposite battery cell 10, reducing the risk of thermal propagation.

[0055] Exemplarily, in a specific implementation manner, when the explosion-proof valve of the battery cell 10 is arranged towards the longitudinal beam 2 in the second direction, in the third direction, the height of the longitudinal beam 2 is higher than the height of the explosion-proof valve of the battery cell 10 by at least a preset height. Among them, the preset height is preferably 5 mm. Of course, the preset height can be set according to actual needs.

[0056] Furthermore, in the third direction, the height of the longitudinal beam 2 is less than the height of the battery cell 10. In this way, it is not only convenient to place the battery cell 10 in the battery cell accommodating cavity 101, but also can increase the gas storage space in the battery cell accommodating cavity 101, so that when the battery cell 10 ejects a large amount of high-temperature gas in a short time, the high-temperature gas can be temporarily accommodated and discharged through the exhaust passage subsequently.

[0057] As Figure 4 shown, the embodiment of the present disclosure also provides a battery pack, which includes the above-mentioned box body structure and at least one battery group. The battery group includes a plurality of battery cells 10 arranged side by side, and the explosion-proof valve of the battery cell 10 is arranged towards the longitudinal beam 2 in the second direction.

[0058] By arranging the longitudinal beam 2 and the exhaust passage, when the battery cell 10 is out of thermal control and ejects high-temperature gas through the explosion-proof valve, the high-temperature gas can be discharged from the box body 1 through the air inlet hole 211, the exhaust cavity 201 and the exhaust passage of the longitudinal beam 2, reducing the risk of thermal propagation.

[0059] The embodiment of the present disclosure also provides a vehicle, which includes the above-mentioned battery pack. This vehicle has the technical effects of the above-mentioned battery pack embodiment, which will not be elaborated here.

[0060] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising said element.

[0061] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A box structure, characterized in that: include: The box body has a battery cell accommodating cavity for accommodating the battery cell; A longitudinal beam is arranged in the battery cell accommodating cavity, the longitudinal beam has an exhaust cavity inside, the longitudinal beam extends along a first direction, and at least one side of the longitudinal beam in a second direction is provided with a plurality of air inlet holes connected to the exhaust cavity and for the gas discharged from the explosion-proof valve of the battery cell to enter, and the first direction is perpendicular to the second direction; An exhaust channel, one end of which is connected to the exhaust cavity and the battery cell accommodating cavity, and the other end of which is connected to the external space of the box body; In the third direction, the height of the longitudinal beam is greater than the height of the explosion-proof valve of the battery cell when it is arranged toward the longitudinal beam in the second direction, and the third direction, the second direction and the first direction are perpendicular to each other.

2. The box structure according to claim 1, characterized in that: The box structure also includes an exhaust pipeline, which is arranged in the box body, and the inner space of the exhaust pipeline constitutes the exhaust channel.

3. The box structure according to claim 2, characterized in that: The box structure also includes a crossbeam extending along the second direction, the crossbeam dividing the inner cavity of the box body into the battery cell accommodating cavity and the electrical component accommodating cavity, the crossbeam is provided with a first exhaust hole and a second exhaust hole connected to each other, the first exhaust hole connecting the exhaust cavity and the battery cell accommodating cavity, the second exhaust hole connecting the exhaust pipe, and the exhaust pipe is arranged in the electrical component accommodating cavity.

4. The box structure according to claim 1, characterized in that: The longitudinal beam includes two plates arranged opposite to each other in the second direction, each of the plates is provided with a plurality of air inlet holes, and a projection of any one of the air inlet holes on one of the plates on a plane perpendicular to the second direction does not overlap with a projection of a plurality of the air inlet holes on the other plate on a plane perpendicular to the second direction.

5. The box structure according to claim 1, characterized in that: In the third direction, the height of the longitudinal beam is smaller than the height of the battery cell.

6. The box structure according to claim 1, characterized in that: The box body includes a bottom plate and a side panel connected to the bottom plate, the battery cell accommodating cavity is formed between the bottom plate and the side panel, and an air guide cavity is provided in the side panel, and the air guide cavity connects the battery cell accommodating cavity and the exhaust channel.

7. The box structure according to claim 1, characterized in that: A plurality of longitudinal beams are provided, and the plurality of longitudinal beams are spaced apart in the second direction, and the exhaust passage is connected to the exhaust cavities of the plurality of longitudinal beams.

8. A battery pack, characterized in that: It comprises a box structure as described in any one of claims 1 to 7 and at least one battery pack, wherein the battery pack comprises a plurality of battery cells arranged side by side, and an explosion-proof valve of the battery cell is arranged toward the longitudinal beam in the second direction.

9. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 8.

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