Exhaust assembly, box body structure and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses an exhaust assembly, a box body structure and a battery pack, the exhaust assembly comprises a first flow guide part and a second flow guide part, and the first flow guide part and the second flow guide part are positioned on the same side of a protective plate and are both connected with the protective plate. The first flow guide piece covers the exhaust hole, a first interval is formed between the first flow guide piece and the exhaust hole in the first direction, the side, away from the exhaust hole, of the first flow guide piece is concavely arranged to form a flow guide cavity, and the opening end of the flow guide cavity faces the exhaust hole. The second flow guide part is an annular part, the second flow guide part surrounds the periphery of the edge of the exhaust hole, the second flow guide part and the first flow guide part are oppositely arranged in the first direction, a second interval is formed between the second flow guide part and the first flow guide part, and the second interval is communicated with the exhaust hole. The first flow guide part and the second flow guide part are used for changing the jetting path of the particulate matter, the situation that the jetted particulate matter directly impacts the anti-explosion valve through the exhaust hole is avoided, the second interval is used for flowing gas, and therefore normal use of the anti-explosion valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to an exhaust component, a box structure and a battery pack. Background Art

[0002] The battery pack box releases pressure, and the gas directly impacts the cavity connected to the box. Depending on the cavity opening connecting the box inside the box and the installation position of the explosion-proof valve, in the event of thermal runaway of the battery pack, the cavity opening connecting the box inside the box may be affected by particles and sparks, causing the piston rod of the explosion-proof valve to be stuck when pushed outward to open the valve, thereby affecting the normal opening of the explosion-proof valve to release pressure, resulting in reduced safety performance of the battery pack.

[0003] Therefore, there is an urgent need for an exhaust assembly, a box structure and a battery pack to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to provide an exhaust assembly, which can prevent the explosion-proof valve from being affected by particles and ensure the normal use of the explosion-proof valve.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] Provided is an exhaust assembly for installation at an exhaust hole on a protective plate, the exhaust assembly comprising a first flow guide and a second flow guide, the first flow guide and the second flow guide being located on the same side of the protective plate and both connected to the protective plate;

[0007] The first guide cover is disposed on the exhaust hole and has a first interval with the exhaust hole in a first direction, the first guide is recessed toward a side away from the exhaust hole to form a guide cavity, and the opening end of the guide cavity faces the exhaust hole;

[0008] The second flow guide is an annular member, which is arranged around the edge periphery of the exhaust hole. The second flow guide and the first flow guide are arranged opposite to each other in the first direction. There is a second interval between the second flow guide and the first flow guide, and the second interval is connected to the exhaust hole.

[0009] Optionally, the second flow guide member includes an inner flow guide ring, and a projection of the inner flow guide ring in the first direction is located in the flow guide cavity.

[0010] Optionally, the second flow guide member further includes an outer flow guide ring, which is arranged outside the inner flow guide ring, and a projection of the outer flow guide ring in the first direction is located outside the flow guide cavity.

[0011] Optionally, the inner flow guide ring and the outer flow guide ring are connected to form an annular groove, the notch of the annular groove faces the open end, and the open end extends into the annular groove.

[0012] Optionally, the exhaust assembly further includes a fan, the fan is connected to the protection plate, the fan is located on the side of the first flow guide member away from the second flow guide member, and the fan can rotate around the first direction.

[0013] Optionally, the fan is connected to the first flow guide member through a rotating shaft, and the rotating shaft is used to synchronously rotate the first flow guide member and the fan.

[0014] Optionally, the exhaust assembly further includes a protective cover, the protective cover is arranged on the protection plate to form a protective cavity, the protective cover is provided with a ventilation port, and the fan is arranged at the ventilation port;

[0015] The fan, the first flow guide member and the second flow guide member are all located in the protective cavity, the first end of the rotating shaft is rotatably connected to the protective cover, and the second end of the rotating shaft passes through the fan and is connected to the first flow guide member.

[0016] Optionally, the cross-sectional area of the first flow guide member gradually increases from the first end to the second end along the first direction, and the second end is the open end.

[0017] Another object of the present invention is to provide a box structure, which can prevent the explosion-proof valve from being affected by particulate matter and ensure the normal use of the explosion-proof valve.

[0018] Based on the above concept, the technical solution adopted by the present invention is:

[0019] Provide a box structure, including an explosion-proof valve, a protection plate and the above-mentioned exhaust assembly, an exhaust hole is provided on the protection plate, and the exhaust assembly and the explosion-proof valve are respectively located on both sides of the protection plate and are both arranged at the exhaust hole.

[0020] Another object of the present invention is to provide a battery pack, which can prevent the explosion-proof valve from being affected by particulate matter and ensure the normal use of the explosion-proof valve.

[0021] Based on the above concept, the technical solution adopted by the present invention is:

[0022] Provide a battery pack, including the above-mentioned box structure.

[0023] The beneficial effects of the present invention are:

[0024] The exhaust assembly proposed in the utility model includes a first guide and a second guide, which are located on the same side of the protective plate and are both connected to the protective plate. The first guide cover is arranged on the exhaust hole and has a first interval with the exhaust hole in the first direction. The first guide is recessed toward the side away from the exhaust hole to form a guide cavity, and the opening end of the guide cavity faces the exhaust hole. The second guide is an annular member, the second guide is arranged around the edge of the exhaust hole, the second guide is arranged opposite to the first guide in the first direction, the second guide and the first guide have a second interval, and the second interval is connected to the exhaust hole. When the battery pack is thermally runaway, the first guide is used to change the injection path of the particles to prevent the injected particles from directly passing through the exhaust hole to impact the explosion-proof valve, causing the explosion-proof valve to be stuck. The first guide and the second guide are arranged opposite to each other at the exhaust hole, so that the injected particles can be rebounded into the guide cavity of the first guide when passing through the second guide, and finally the sparks of the particles will be extinguished in the guide cavity. The second gap between the first guide member and the second guide member connected to the exhaust hole allows the gas to flow to the exhaust hole through the second gap, that is, the arrangement of the first guide member and the second guide member will not affect the gas discharge, thereby ensuring the normal use of the explosion-proof valve.

[0025] The box structure proposed by the utility model includes an explosion-proof valve, a protection plate and the above-mentioned exhaust assembly, an exhaust hole is arranged on the protection plate, and the exhaust assembly and the explosion-proof valve are respectively located on both sides of the protection plate and are both arranged at the exhaust hole. When the battery pack is depressurized, the gas and particulate matter generated in the battery pack will be ejected toward the exhaust hole, and when the particulate matter passes through the obstruction of the first guide member and the second guide member, the sparks will be extinguished, and the particulate matter ejected to the explosion-proof valve will be reduced, which can effectively avoid the influence of the particulate matter on the opening of the explosion-proof valve, and ensure the safety performance of the battery pack.

[0026] The battery pack proposed by the utility model includes the above-mentioned box structure. The box structure of the battery pack is provided with an exhaust assembly, which is used to block the particles ejected toward the exhaust hole when the battery pack is depressurized, which can not only extinguish the sparks, but also reduce the particles ejected to the explosion-proof valve, which can effectively avoid the influence of the particles on the opening of the explosion-proof valve, and ensure the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a cross-sectional view of the first exhaust assembly and the protective plate provided in the first embodiment of the utility model. Figure 1 ;

[0028] Figure 2 This is a cross-sectional view of the first exhaust assembly and the protective plate provided in the first embodiment of the utility model. Figure 2 ;

[0029] Figure 3It is the cross-sectional view of the second exhaust component and the protection plate provided in the first embodiment of the present utility model;

[0030] Figure 4 It is the cross-sectional view of the third exhaust component and the protection plate provided in the first embodiment of the present utility model;

[0031] Figure 5 It is the cross-sectional view of the fourth exhaust component and the protection plate provided in the first embodiment of the present utility model;

[0032] Figure 6 It is the partial structural schematic diagram of the first exhaust component provided in the first embodiment of the present utility model Figure 1 (Without protective cover);

[0033] Figure 7 It is the partial structural schematic diagram of the first exhaust component provided in the first embodiment of the present utility model Figure 2 (Without protective cover);

[0034] Figure 8 It is the partial structural schematic diagram of the first exhaust component provided in the first embodiment of the present utility model Figure 3 (Without the second flow guide member);

[0035] Figure 9 It is the structural schematic diagram of the first exhaust component provided in the first embodiment of the present utility model;

[0036] Figure 10 It is the partial structural schematic diagram of the first exhaust component and the protection plate provided in the first embodiment of the present utility model;

[0037] Figure 11 It is the partial structural schematic diagram of the box structure provided in the second embodiment of the present utility model Figure 1 (Without explosion-proof valve);

[0038] Figure 12 It is the partial structural schematic diagram of the box structure provided in the second embodiment of the present utility model Figure 2 (With explosion-proof valve);

[0039] Figure 13 It is the partial cross-sectional view of the box structure provided in the second embodiment of the present utility model (with explosion-proof valve).

[0040] In the figure:

[0041] 1. First flow guide member; 11. Flow guide cavity; 12. Open end;

[0042] 2. Second flow guide member; 21. Annular groove; 22. Groove opening; 201. Inner flow guide ring; 202. Outer flow guide ring;

[0043] 3. Fan; 31. Rotating shaft;

[0044] 4. Protective cover; 41. Protection chamber; 42. Ventilation port; 43. Reinforcing rib;

[0045] 100. Protection plate; 1001. Exhaust hole;

[0046] 200. Exhaust assembly;

[0047] 300. Explosion-proof valve. Detailed implementation manners

[0048] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation manners. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model are shown in the accompanying drawings, rather than all of them.

[0049] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the non-direct contact of the first and second features but through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0051] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left", and "right" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0053] Embodiment 1

[0054] When thermal runaway occurs in the battery pack, during the process of the flammable gas in the battery pack spraying out, a large number of high-temperature particulate matters will be carried out. These particulate matters will form bright sparks and may also be sprayed to the explosion-proof valve 300, resulting in the explosion-proof valve 300 being stuck and affecting its valve-opening and pressure-relieving function. This embodiment provides an exhaust assembly 200, which is used to be installed at the exhaust hole 1001 on the protection plate 100. The exhaust hole 1001 is communicated with the explosion-proof valve 300. The exhaust assembly 200 can prevent the explosion-proof valve 300 from being affected by particulate matters and ensure the normal use of the explosion-proof valve 300.

[0055] Specifically, as Figures 1 to 10 shown, the exhaust assembly 200 includes a first flow guide member 1 and a second flow guide member 2. The first flow guide member 1 and the second flow guide member 2 are located on the same side of the protection plate 100 and are both connected to the protection plate 100. The first flow guide member 1 covers the exhaust hole 1001 and has a first interval from the exhaust hole 1001 in the first direction. The first flow guide member 1 is recessed toward the side away from the exhaust hole 1001 to form a flow guide cavity 11, and the open end 12 of the flow guide cavity 11 faces the exhaust hole 1001. The second flow guide member 2 is an annular member. The second flow guide member 2 surrounds the outer periphery of the edge of the exhaust hole 1001. The second flow guide member 2 is disposed opposite to the first flow guide member 1 in the first direction. The second flow guide member 2 and the first flow guide member 1 have a second interval, and the second interval is communicated with the exhaust hole 1001. When thermal runaway occurs in the battery pack, the first flow guide member 1 is used to change the spraying path of the particulate matters, avoiding the directly sprayed particulate matters from impacting the explosion-proof valve 300 through the exhaust hole 1001 and causing the explosion-proof valve 300 to be stuck. The first flow guide member 1 and the second flow guide member 2 are disposed opposite to each other at the exhaust hole 1001, which enables the sprayed particulate matters to be rebounded into the flow guide cavity 11 of the first flow guide member 1 when passing through the second flow guide member 2, and finally the sparks of the particulate matters will be extinguished in the flow guide cavity 11. The second interval existing between the first flow guide member 1 and the second flow guide member 2 and communicated with the exhaust hole 1001 enables the gas to flow to the exhaust hole 1001 through the second interval, that is, the settings of the first flow guide member 1 and the second flow guide member 2 will not affect the gas discharge and can ensure the normal use of the explosion-proof valve 300. During specific implementation, the distance of the second interval between the first flow guide member 1 and the second flow guide member 2 can be adjusted according to the size of the particulate matters sprayed during thermal runaway of the battery pack to prevent the particulate matters from being blocked in the second interval.

[0056] Optionally, the second flow guiding member 2 includes an inner flow guiding ring 201, and the projection of the inner flow guiding ring 201 in the first direction is located within the flow guiding cavity 11. That is, when the battery pack undergoes thermal runaway, the ejected particulate matter can be ejected through the second gap between the first flow guiding member 1 and the second flow guiding member 2 to the inner flow guiding ring 201, and then rebound from the inner flow guiding ring 201 to the cavity wall of the flow guiding cavity 11. Finally, the sparks of the particulate matter are extinguished within the flow guiding cavity 11.

[0057] Optionally, the second flow guiding member 2 further includes an outer flow guiding ring 202. The outer flow guiding ring 202 is disposed around the outside of the inner flow guiding ring 201, and the projection of the outer flow guiding ring 202 in the first direction is located outside the flow guiding cavity 11. That is, when the battery pack undergoes thermal runaway, the ejected particulate matter can be ejected through the second gap between the first flow guiding member 1 and the second flow guiding member 2 to the inner flow guiding ring 201, or the ejected particulate matter is directly ejected to the side of the outer flow guiding ring 202 facing the inner flow guiding ring 201, and then rebounds from the outer flow guiding ring 202 to the inner flow guiding ring 201. Finally, it rebounds from the inner flow guiding ring 201 to the cavity wall of the flow guiding cavity 11, or directly rebounds from the outer flow guiding ring 202 to the cavity wall of the flow guiding cavity 11.

[0058] Optionally, the inner flow guiding ring 201 and the outer flow guiding ring 202 are connected to form an annular groove 21, and the notch 22 of the annular groove 21 faces the open end 12. As Figure 2 shown, in this embodiment, the open end 1 extends into the annular groove 21, and there is a second gap between the open end 12 and the inner wall of the annular groove 21. That is, the open end 12 divides the annular groove 21 into an inner ring groove and an outer ring groove in space. When the particulate matter is ejected, the particulate matter can be ejected along the outer wall of the first flow guiding member 1 to the outer ring groove, and rebound from the groove wall of the outer ring groove to the cavity wall of the flow guiding cavity 11, or rebound from the groove wall of the outer ring groove to the groove wall of the inner ring groove, and then rebound to the cavity wall of the flow guiding cavity 11 again.

[0059] In other embodiments, as Figure 4 and Figure 5 shown, it is also possible to set a second gap between the open end 12 of the first flow guiding member 1 and the notch 22 of the second flow guiding member 2 in the second direction, and the plane where the open end 12 is located is coplanar with the plane where the notch 22 is located.

[0060] Optionally, the bottom of the annular groove 21 is arc-shaped. When the particulate matter bounces into the annular groove 21, it can bounce multiple times on the arc-shaped bottom to extinguish the sparks and at the same time reduce the ejection speed of the particulate matter.

[0061] Optionally, the second flow guiding member 2 is an integral structural member, and the second flow guiding member 2 is welded to the protection plate 100.

[0062] Furthermore, as Figure 6 and Figure 7As shown, the exhaust assembly 200 further includes a fan 3, which is connected to the protective plate 100 and is located on the side of the first guide member 1 away from the second guide member 2, and the fan 3 can rotate in a first direction. In this embodiment, the driving force for driving the fan 3 to rotate is derived from the pressure difference generated when the battery pack is depressurized, and the rotation of the fan 3 can accelerate the discharge of gas.

[0063] Optionally, the fan 3 is connected to the first air guide 1 via a rotating shaft 31, and the rotating shaft 31 is used to make the first air guide 1 and the fan 3 rotate synchronously. That is, when the battery pack is depressurized, the first air guide 1 will also rotate around the first direction, and the rotation of the first air guide 1 will not affect its obstruction to the particles. When the particles are extinguished in the guide cavity 11, the centrifugal force generated by the rotation of the first air guide 1 makes the particles have a tendency to rotate along the cavity wall of the guide cavity 11, which can further reduce the particles flying to the exhaust hole 1001.

[0064] Optionally, the cross-sectional area of ​​the first flow guide 1 gradually increases from the first end to the second end along the first direction, and the second end is an open end 12. In this embodiment, the first flow guide 1 is a bowl-shaped structure, which can reduce the obstruction of the first flow guide 1 to the gas flow, so that the gas can quickly pass through the first flow guide 1 and flow to the exhaust hole 1001 through the second gap between the first flow guide 1 and the second flow guide 2.

[0065] Furthermore, if Figure 10 As shown, the exhaust assembly 200 also includes a protective cover 4, which is arranged on the protective plate 100 to form a protective cavity 41. The protective cover 4 is provided with a vent 42, which is used to connect the protective cavity 41 and the interior of the battery pack, that is, gas, particulate matter, etc. can enter the protective cavity 41 through the vent 42, and the fan 3 is arranged at the vent 42. The vent 42 is arranged on the top plate where the protective cover 4 and the fan 3 are arranged opposite to each other, and the area of ​​the vent 42 is larger than the projection area of ​​the fan 3. A plurality of reinforcing ribs 43 are arranged in the vent 42, and the plurality of reinforcing ribs 43 are connected to the hole wall of the vent 42 at one end, and the other end is gathered to the center of the vent 42. The fan 3, the first guide member 1 and the second guide member 2 are all located in the protective cavity 41, the first end of the rotating shaft 31 is connected to the rotating shaft 31 of the protective cover 4, and the second end of the rotating shaft 31 passes through the fan 3 and is connected to the first guide member 1. Optionally, the second end of the rotating shaft 31 is welded to the first guide member 1. In this embodiment, the first end of the rotating shaft 31 is inserted into the center where the multiple reinforcing ribs 43 converge to ensure the connection strength. The protective cover 4 also includes multiple side panels arranged around the top plate, and at least the two opposite side panels have outer flanges, and the outer flanges are provided with fixing holes, and fasteners can be inserted into the fixing holes to connect with the protective plate 100.

[0066] Embodiment 2

[0067] like Figures 11 to 13As shown in the figure, this embodiment provides a box structure, including an explosion-proof valve 300, a protection plate 100, and the above-mentioned exhaust assembly 200. An exhaust hole 1001 is provided on the protection plate 100. The exhaust assembly 200 and the explosion-proof valve 300 are respectively located on both sides of the protection plate 100 and are both arranged at the exhaust hole 1001. When the battery pack relieves pressure, the gas and particulate matter generated inside the battery pack will be ejected towards the exhaust hole 1001. After the particulate matter passes through the obstruction of the first deflector 1 and the second deflector 2, the spark is extinguished, and the particulate matter ejected to the explosion-proof valve 300 will be reduced, effectively avoiding the impact of the particulate matter on the opening of the explosion-proof valve 300 and ensuring the safety performance of the battery pack.

[0068] Optionally, the explosion-proof valve 300 is detachably arranged on the protection plate 100 through fasteners such as bolts. The explosion-proof valve 300 is installed at the exhaust hole 1001. When a thermal runaway occurs in the battery pack, the high-temperature gas can impact the explosion-proof valve 300, causing the explosion-proof valve 300 to be damaged, thereby realizing the pressure relief inside the battery pack and avoiding the explosion of the battery pack.

[0069] Embodiment Three

[0070] This embodiment provides a battery pack, including the above-mentioned box structure. The exhaust assembly 200 is arranged on the box structure of the battery pack and is used to block the particulate matter ejected towards the exhaust hole 1001 when the battery pack relieves pressure. It can not only extinguish the spark but also reduce the particulate matter ejected to the explosion-proof valve 300, effectively avoiding the impact of the particulate matter on the opening of the explosion-proof valve 300 and ensuring the safety performance of the battery pack.

[0071] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust assembly, used for installation at an exhaust hole (1001) on a protective plate (100), characterized in that: The exhaust assembly (200) comprises a first flow guide (1) and a second flow guide (2), wherein the first flow guide (1) and the second flow guide (2) are located on the same side of the protection plate (100) and are both connected to the protection plate (100); The first flow guide (1) is disposed on the exhaust hole (1001) and has a first interval with the exhaust hole (1001) in a first direction; the first flow guide (1) is recessed toward a side away from the exhaust hole (1001) to form a flow guide cavity (11); an opening end (12) of the flow guide cavity (11) faces the exhaust hole (1001); The second flow guide (2) is an annular member, the second flow guide (2) is arranged around the outer periphery of the edge of the exhaust hole (1001), the second flow guide (2) and the first flow guide (1) are arranged opposite to each other in a first direction, the second flow guide (2) and the first flow guide (1) have a second interval, and the second interval is connected to the exhaust hole (1001).

2. The exhaust assembly according to claim 1, characterized in that The second flow guide member (2) comprises an inner flow guide ring (201), and a projection of the inner flow guide ring (201) in the first direction is located within the flow guide cavity (11).

3. The exhaust assembly according to claim 2, characterized in that The second flow guide member (2) further comprises an outer flow guide ring (202), wherein the outer flow guide ring (202) is arranged outside the inner flow guide ring (201), and the projection of the outer flow guide ring (202) in the first direction is located outside the flow guide cavity (11).

4. The exhaust assembly according to claim 3, characterized in that The inner guide ring (201) and the outer guide ring (202) are connected to form an annular groove (21), the notch (22) of the annular groove (21) faces the open end (12), and the open end (12) extends into the annular groove (21).

5. The exhaust assembly according to claim 1, characterized in that The exhaust assembly (200) further comprises a fan (3), wherein the fan (3) is connected to the protection plate (100), the fan (3) is located on a side of the first air guide (1) facing away from the second air guide (2), and the fan (3) is capable of rotating around the first direction.

6. The exhaust assembly according to claim 5, characterized in that The fan (3) is connected to the first air guide member (1) via a rotating shaft (31), and the rotating shaft (31) is used to enable the first air guide member (1) and the fan (3) to rotate synchronously.

7. The exhaust assembly according to claim 6, characterized in that The exhaust assembly (200) further comprises a protective cover (4), wherein the protective cover (4) is arranged on the protection plate (100) to form a protective cavity (41), an air vent (42) is arranged on the protective cover (4), and the fan (3) is arranged at the air vent (42); The fan (3), the first air guide (1) and the second air guide (2) are all located in the protective cavity (41); the first end of the rotating shaft (31) is rotatably connected to the protective cover (4); and the second end of the rotating shaft (31) passes through the fan (3) and is connected to the first air guide (1).

8. The exhaust assembly according to claim 1, characterized in that The cross-sectional area of ​​the first flow guide (1) gradually increases from the first end to the second end along the first direction, and the second end is an open end (12).

9. The box structure is characterized by: The invention comprises an explosion-proof valve (300), a protection plate (100) and an exhaust assembly (200) according to any one of claims 1 to 8, wherein an exhaust hole (1001) is arranged on the protection plate (100), and the exhaust assembly (200) and the explosion-proof valve (300) are respectively located on two sides of the protection plate (100) and are both arranged at the exhaust hole (1001).

10. A battery pack, characterized in that: Including the box structure described in claim 9.

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