Natural cooling battery box, battery pack and energy storage system

Abstract

The utility model belongs to the technical field of batteries, and particularly discloses a naturally cooled battery box, a battery pack and an energy storage system. An accommodating cavity for accommodating a battery module is formed in a shell of the naturally cooled battery box, and a fin assembly is arranged on the outer wall surface of the shell. The air inlet end of the exhaust pipe is communicated with the containing cavity of the shell, a blocking cover is arranged at the exhaust end of the exhaust pipe, and the blocking cover is detachably connected with the exhaust end. Under the use scene of the naturally cooled battery box, the heat of the battery module is quickly dissipated through the shell and the fin assembly, and meanwhile, the exhaust end of the exhaust pipe communicated with the accommodating cavity is connected with the air suction device, so that if the battery module has a thermal runaway risk, a large amount of smoke can be exhausted to the external space through the exhaust pipe, the air suction pipeline and the air suction device, and the heat dissipation efficiency is improved. According to the invention, fire and explosion risks are avoided, the safety is high, the shell is kept in a relatively closed state, the sealing grade is high, and the waterproof device can adapt to scenes with waterproof requirements. The battery pack and the energy storage system comprise the naturally cooled battery box.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a naturally cooled battery box, a battery pack and an energy storage system. Background Art

[0002] As a key component of the energy storage system, the performance of the battery pack directly affects the stability of the energy storage system's power supply and the capacity of stored energy. The battery pack generally includes a naturally cooled battery box and a battery module. The battery module is set in a naturally cooled battery box. The power supply performance of the battery pack is closely related to the temperature of the battery module. When the temperature is too high, the side reactions of the battery module are accelerated, increasing the attenuation, which is easy to cause thermal runaway and cause safety accidents; when the temperature is too low, the power supply power and storage capacity of the battery module will be significantly reduced. To this end, it is necessary to ensure that the battery module in the naturally cooled battery box is at an optimal temperature, preferably in the range of 20 to 30°C, and more comfortable to keep it in the range of 0 to 45°C.

[0003] During the power supply process of the battery module, the battery module will generate a lot of heat, which is not easy to dissipate when it is gathered in the naturally cooled battery box. In order to make the temperature of the battery module at the above-mentioned optimal temperature, the battery module needs to be cooled. At present, common heat dissipation methods include natural heat dissipation, air cooling and liquid cooling. Among them, liquid cooling has a better heat dissipation and cooling effect, but the cost is high and the energy consumption is high. The air cooling heat dissipation method requires the reservation of air ducts in the naturally cooled battery box of the battery pack, which cannot guarantee the sealing of the battery pack, does not meet the requirements of the waterproof grade IP67, and is not suitable for scenes with waterproof requirements. Although the natural heat dissipation method can meet the sealing requirements, the heat generated by the battery module when it is powered is not easy to dissipate from the naturally cooled battery box, especially when the battery module has thermal runaway, the smoke in the naturally cooled battery box cannot be discharged, which is easy to cause fire, explosion and other dangers, and the safety is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a naturally cooled battery box, a battery pack and an energy storage system. The naturally cooled battery box adopts natural heat dissipation to dissipate heat and cool down, and has good sealing performance. At the same time, an exhaust pipe is reserved on the naturally cooled battery box to solve the problem that smoke in the naturally cooled battery box cannot be discharged, causing fire, explosion and other dangerous problems, and has better safety performance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a naturally cooled battery box, comprising:

[0007] The shell body is hollow inside to form a receiving cavity;

[0008] A fin assembly is disposed on the outer wall surface of the shell and extends in a direction away from the accommodating cavity;

[0009] The exhaust pipe comprises an air inlet end and an exhaust end, wherein the air inlet end is communicated with the accommodating cavity of the shell, and a blocking cover is provided at the exhaust end, wherein the blocking cover is detachably connected to the exhaust end, and the blocking cover selectively blocks the exhaust end.

[0010] Optionally, the shell includes an upper shell and a lower shell, the upper shell and the lower shell are buckled and arranged to form the accommodating cavity, the upper shell and the lower shell are sealed, at least one of the upper shell and the lower shell is provided with the fin assembly, and the air intake of the exhaust pipe is connected to at least one of the upper shell and the lower shell.

[0011] Optionally, the upper shell and the lower shell have the same structure, the upper shell and the lower shell are symmetrically arranged about the central axis of the naturally cooled battery box along the first direction, and the upper shell and the lower shell are symmetrically arranged about the central axis of the naturally cooled battery box along the second direction.

[0012] Optionally, the exhaust pipe includes a first tube shell and a second tube shell, the first tube shell is connected to the upper shell, the second tube shell is connected to the lower shell, the first tube shell and the second tube shell are buckled together to form the exhaust pipe, and the first tube shell and the second tube shell are sealed and connected.

[0013] Optionally, the naturally cooled battery box includes a connecting piece, the exhaust end of the exhaust pipe is provided with a fixing edge, the fixing edge extends outward along the radial direction of the exhaust pipe, the fixing edge is provided with a first fixing hole, the sealing cover is provided with a second fixing hole, the connecting piece is passed through the first fixing hole and the second fixing hole, and the connecting piece detachably connects the sealing cover and the exhaust pipe.

[0014] Optionally, the naturally cooled battery box includes a cooling fan, and the cooling fan is arranged on one side of the fin assembly.

[0015] Optionally, the fin assembly includes a plurality of first heat dissipation fins and a plurality of second heat dissipation fins, and the plurality of first heat dissipation fins and the plurality of second heat dissipation fins extend in the same direction and are arranged at intervals;

[0016] The height of the second heat dissipating fin is lower than that of the first heat dissipating fin, so that a groove for accommodating the heat dissipating fan is formed at the second heat dissipating fin; or the height of at least part of the second heat dissipating fin is lower than that of the first heat dissipating fin, so that a groove for accommodating the heat dissipating fan is formed at a position where the height of the second heat dissipating fin is lower than that of the first heat dissipating fin.

[0017] Optionally, support columns are provided at four corners of the shell, and the support columns are used to support the shell, and the height of the support columns is higher than the height of the fin assembly.

[0018] In a second aspect, the utility model provides a battery pack, including a battery module and a naturally cooled battery box in any of the above schemes, wherein the battery module is arranged in the naturally cooled battery box.

[0019] In a third aspect, the utility model provides an energy storage system, comprising an air intake device and a battery pack in any of the above schemes, wherein the air intake device is selectively connected to an exhaust pipe of a naturally cooled battery box, and the air intake device is used to discharge the gas in the naturally cooled battery box.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a naturally cooled battery box, comprising a shell, a fin assembly and an exhaust pipe. The inner hollow of the shell forms a housing for placing a battery module, and the fin assembly is arranged on the outer wall surface of the shell and extends in a direction away from the housing. The air inlet end of the exhaust pipe is connected to the housing chamber of the shell, and a plugging cover is provided at the exhaust end of the exhaust pipe, and the plugging cover is detachably connected to the exhaust end. In the use scenario of the naturally cooled battery box, the heat generated by the battery module during charging and discharging can be quickly dissipated through the shell and the fin assembly, and at the same time, the exhaust end of the exhaust pipe connected to the housing chamber is not equipped with a plugging cover, and the exhaust end of the exhaust pipe is connected to the air intake device through an air intake pipeline. At this time, if the battery module in its housing chamber has a risk of thermal runaway, a large amount of smoke generated by the battery module can be discharged to the external space through the exhaust pipe, the air intake pipeline and the air intake device, so as to avoid the risk of fire and explosion, and the safety is high, and the shell remains in a relatively closed state, and the sealing level is high, which can be adapted to the scene with waterproof requirements. When the naturally cooled battery box is not in use, the sealing cover can be installed to the exhaust end of the exhaust pipe. At this time, the sealing cover will seal the exhaust end of the exhaust pipe, and the shell will be completely closed, which can prevent dust, water vapor, etc. from entering the housing cavity of the shell, thereby preventing the battery module from being invaded by dust, water vapor, etc., and extending the service life.

[0022] The utility model provides a battery pack, including a battery module and the above-mentioned naturally cooled battery box, wherein the battery module is arranged in the naturally cooled battery box. When the battery module is charged and discharged, the naturally cooled battery box can quickly dissipate the heat generated by the battery module, and the cooling effect is good. At the same time, the exhaust pipe of the naturally cooled battery box can discharge a large amount of smoke generated when the battery module has thermal runaway, thereby avoiding the danger of fire, explosion, etc., and having high safety.

[0023] The utility model also provides an energy storage system, including an air intake device and the above-mentioned battery pack, wherein the air intake device is selectively connected to the exhaust pipe of the naturally cooled battery box. When the battery pack is installed in the energy storage system and supplies power to an electrical device, the air intake device can be connected to the exhaust pipe of the naturally cooled battery box. When the battery pack is at risk of thermal runaway, the gas in the naturally cooled battery box can be discharged through the air intake device, thereby ensuring the safety of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a naturally cooled battery box provided in an embodiment of the utility model;

[0025] Figure 2 is an exploded view of a naturally cooled battery box provided in an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the partial structure of the exhaust pipe, the blocking cover and the housing when they are assembled in the embodiment of the utility model;

[0027] Figure 4 It is a front view of a naturally cooled battery box provided in an embodiment of the utility model;

[0028] Figure 5 is a side view of a naturally cooled battery box provided in an embodiment of the utility model;

[0029] Figure 6 It is a schematic structural diagram of a naturally cooled battery box provided in an embodiment of the utility model from another perspective.

[0030] In the figure:

[0031] 100, shell; 110, upper shell; 120, lower shell; 130, support column; 101, accommodating cavity; 200, fin assembly; 210, first heat dissipating fin; 220, second heat dissipating fin; 201, groove; 300, exhaust pipe; 310, first tube shell; 320, second tube shell; 330, fixing edge; 331, first fixing hole; 400, blocking cover; 410, second fixing hole; 500, BMS protective cover. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figure 1-Figure 3 As shown, this embodiment provides a naturally cooled battery box, which includes a shell 100, a fin assembly 200 and an exhaust pipe 300. The interior of the shell 100 is hollow to form a receiving cavity 101, and the receiving cavity 101 can be used to place a battery module. The fin assembly 200 is arranged on the outer wall surface of the shell 100 and extends in a direction away from the receiving cavity 101. The exhaust pipe 300 includes an air inlet end and an exhaust end, the air inlet end is connected to the receiving cavity 101 of the shell 100, and a blocking cover 400 is provided at the exhaust end, and the blocking cover 400 is detachably connected to the exhaust end, and the blocking cover 400 selectively blocks the exhaust end.

[0037] In the use scenario of a naturally cooled battery box, the heat generated by the battery module during charging and discharging can be transferred to the shell 100, and then the heat dissipation is accelerated through the fin assembly 200 on the shell 100, and the natural cooling effect is good. In addition, the shell 100 of the naturally cooled battery box in this embodiment adopts a closed design scheme, and the exhaust end of the exhaust pipe 300 connected to the accommodating cavity 101 is not installed with a blocking cover 400, and the exhaust end of the exhaust pipe 300 is connected to the air intake device through an air intake pipeline. At this time, if the battery module in the accommodating cavity 101 has a risk of thermal runaway, a large amount of smoke generated by the battery module can be discharged to the outside space through the exhaust pipe 300, the air intake pipeline and the air intake device, avoiding the risk of fire and explosion, and having a higher safety. The shell 100 remains in a relatively closed state, and the sealing level is high, which can be adapted to scenes with waterproof requirements. When the naturally cooled battery box is not in use, the sealing cover 400 can be installed to the exhaust end of the exhaust pipe 300. At this time, the sealing cover 400 blocks the exhaust end of the exhaust pipe 300, and the shell 100 is completely closed, which can prevent dust, water vapor, etc. from entering the accommodating cavity 101 of the shell 100, thereby preventing the battery module from being invaded by dust, water vapor, etc., and extending the service life.

[0038] Further, the housing 100 includes an upper shell 110 and a lower shell 120, the upper shell 110 and the lower shell 120 are buckled and enclosed to form a receiving cavity 101, the upper shell 110 and the lower shell 120 are sealed and connected, at least one of the upper shell 110 and the lower shell 120 is provided with a fin assembly 200, and the air intake of the exhaust pipe 300 is connected to at least one of the upper shell 110 and the lower shell 120. For example, in order to ensure the sealing between the upper shell 110 and the lower shell 120, a sealing gasket can be provided between the upper shell 110 and the lower shell 120, and the two are sealed and connected by welding.

[0039] As an optional solution, in this embodiment, the fin assembly 200 is provided on both the upper shell 110 and the lower shell 120, and half of the exhaust pipe 300 is provided on the upper shell 110, and the other half is provided on the lower shell 120. In this embodiment, two sets of fin assemblies 200 are provided on both the upper shell 110 and the lower shell 120. In this design solution, the upper shell 110 and the lower shell 120 can be set to the same structure and made with the same mold, thereby saving processing costs and improving processing efficiency. Figure 4 and Figure 5 In this embodiment, the upper shell 110 and the lower shell 120 are about the central axis of the naturally cooled battery box along the first direction (i.e. Figure 4 The upper shell 110 and the lower shell 120 are symmetrically arranged along the central axis along the Z-axis direction, and the upper shell 110 and the lower shell 120 are symmetrically arranged along the second direction (i.e., the central axis along the Z-axis direction) with respect to the naturally cooled battery box. Figure 5 The two components are symmetrically arranged along the central axis (as shown in FIG. 1 ) along the Y-axis direction.

[0040] Continue to see Figure 3 The exhaust pipe 300 in this embodiment includes a first tube shell 310 and a second tube shell 320. The first tube shell 310 is connected to the upper shell 110, and the second tube shell 320 is connected to the lower shell 120, that is, half of the exhaust pipe 300 is arranged on the upper shell 110, and the other plate of the exhaust pipe 300 is arranged on the lower shell 120. When the first tube shell 310 and the second tube shell 320 are buckled together, they form a complete exhaust pipe 300, and the first tube shell 310 and the second tube shell 320 are sealed. For example, after the first tube shell 310 and the second tube shell 320 are buckled together, the seams of the two can be welded, thereby achieving a sealed connection to prevent leakage of the exhaust pipe 300. Optionally, when the exhaust end of the exhaust pipe 300 is connected to the air intake pipeline of the air intake device, a sealing gasket can also be arranged between the exhaust end of the exhaust pipe 300 and the air intake pipeline to ensure that smoke does not leak from the interface between the exhaust pipe 300 and the air intake pipeline.

[0041] Further, the naturally cooled battery box includes a connector, and the exhaust end of the exhaust pipe 300 is provided with a fixed edge 330, and the fixed edge 330 extends outward in the radial direction of the exhaust pipe 300. Similarly, the fixed edge 330 is also divided into two parts, one half is connected to the first tube shell 310, and the other half is connected to the second tube shell 320. Exemplarily, a first fixing hole 331 is provided on the fixed edge 330, and a second fixing hole 410 is provided on the blocking cover 400. The connector is penetrated through the first fixing hole 331 and the second fixing hole 410, and the blocking cover 400 and the exhaust pipe 300 are detachably connected through the connector. Optionally, the connector can be a combination of a nut and a bolt, or it can be a screw. And the number of the connector, the first fixing hole 331, and the second fixing hole 410 can be set to multiple, and the connector, the first fixing hole 331, and the second fixing hole 410 correspond one to one. The plurality of first fixing holes 331 are evenly spaced apart in the circumferential direction of the fixing edge 330 , and the plurality of second fixing holes 410 are evenly spaced apart in the circumferential direction of the blocking cover 400 .

[0042] Optionally, the exhaust pipe 300 and the air intake pipeline may be connected in the same manner as the blocking cover 400, which will not be described in detail here.

[0043] The naturally cooled battery box further includes a heat dissipation fan (not shown in the figure), which is disposed on one side of the fin assembly 200. The fan can accelerate the flow of air around the fin assembly 200, so that the heat of the housing 100 can be taken away by the flowing air, and the heat dissipation efficiency is higher.

[0044] As an optional solution, the heat dissipation fan may be provided only on one side of the fin assembly 200 connected to the lower shell 120. Of course, in other embodiments, the heat dissipation fan may also be provided only on one side of the fin assembly 200 connected to the upper shell 110, or the heat dissipation fan may be provided on one side of the fin assembly 200 connected to both the upper shell 110 and the lower shell 120.

[0045] Continue to see Figure 1 and Figure 2 In this embodiment, the fin assembly 200 includes a plurality of first heat dissipation fins 210 and a plurality of second heat dissipation fins 220. The first heat dissipation fins 210 and the plurality of second heat dissipation fins 220 extend in the same direction and are arranged at intervals. For example, the first heat dissipation fins 210 and the second heat dissipation fins 220 extend in the third direction (i.e. Figure 1 , Figure 2 The first heat dissipating fins 210 and the second heat dissipating fins 220 are arranged at equal intervals along the second direction.

[0046] Furthermore, the height of the second heat dissipation fin 220 can be set to be lower than the height of the first heat dissipation fin 210, so as to form a groove 201 for accommodating a heat dissipation fan at the second heat dissipation fin 220, and the heat dissipation fan can be set at the position where the groove 201 is located, so that the heat dissipation fan can be embedded in the groove 201, or the end surface of the heat dissipation fan facing away from the housing 100 is flush with the end of the first heat dissipation fin 210, thereby reducing the occupied space of the naturally cooled battery box along the first direction, and the integration is higher. Of course, in some embodiments, the height of at least part of the second heat dissipation fin 220 can also be set to be lower than the height of the first heat dissipation fin 210, so as to form a groove 201 for accommodating a heat dissipation fan at a position where the height of the second heat dissipation fin 220 is lower than that of the first heat dissipation fin 210, and at this time, the cross section (XZ plane) of the second heat dissipation fin 220 is L-shaped.

[0047] In this embodiment, support columns 130 are further provided at the four corners of the shell 100. The support columns 130 can be used to support the shell 100. The height of the support columns 130 is higher than the height of the fin assembly 200, thereby ensuring that when the shell 100 is placed on a plane, the fin assembly 200 will not interfere with the plane, thereby preventing the end of the fin assembly 200 from being damaged.

[0048] See also Figure 2 and Figure 6In this embodiment, a BMS protective cover 500 is further provided on the side of the shell 100 opposite to the exhaust pipe 300. The BMS protective cover 500 can also be connected to the shell 100 by screws, bolts, etc. The battery module is connected to the BMS component (battery management system). The BMS protective cover 500 is arranged at the BMS component. The BMS protective cover 500 can protect the BMS component from being bumped, and at the same time, the BMS component is also encapsulated in the naturally cooled battery box to ensure that the sealing level of the naturally cooled battery box meets the requirements.

[0049] The present embodiment also provides a battery pack, which includes a battery module and the above-mentioned naturally cooled battery box, and the battery module is arranged in the naturally cooled battery box. When the battery module is charged and discharged, the naturally cooled battery box can quickly dissipate the heat generated by the battery module, and the cooling effect is good. At the same time, the exhaust pipe 300 of the naturally cooled battery box can discharge a large amount of smoke generated when the battery module has thermal runaway, avoiding the danger of fire, explosion, etc., and has high safety. When the battery pack is not in use, the sealing cover 400 can also be installed to the exhaust end of the exhaust pipe 300, so that the battery pack is in a completely closed state to prevent dust, water vapor, etc. from entering the accommodating cavity 101 of the shell 100 and contacting the battery module.

[0050] The present embodiment also provides an energy storage system, including an air intake device, and the above-mentioned battery pack, wherein the air intake device is selectively connected to the exhaust pipe 300 of the naturally cooled battery box. When the battery pack is installed in the energy storage system and supplies power to an electrical device, the air intake device can be connected to the exhaust pipe 300 of the naturally cooled battery box. When the battery pack is at risk of thermal runaway, the gas in the naturally cooled battery box can be discharged through the air intake device, thereby ensuring the safety of the energy storage system. When the battery pack runs out of power, the air intake device is disconnected from the exhaust pipe 300 of the naturally cooled battery box, and the battery pack is removed from the energy storage system. Then, the sealing cap 400 is installed on the exhaust end of the exhaust pipe 300 of the naturally cooled battery box, so that the battery pack is in a completely closed state to ensure sealing.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A naturally cooled battery box, characterized in that: include: The housing (100) is hollow inside to form a receiving chamber (101); A fin assembly (200) is arranged on the outer wall surface of the housing (100) and extends in a direction away from the accommodating cavity (101); The exhaust pipe (300) comprises an air inlet end and an exhaust end, wherein the air inlet end is in communication with the accommodating chamber (101) of the shell (100), and a blocking cover (400) is provided at the exhaust end, wherein the blocking cover (400) is detachably connected to the exhaust end, and the blocking cover (400) selectively blocks the exhaust end.

2. The naturally cooled battery box according to claim 1, characterized in that: The shell (100) comprises an upper shell (110) and a lower shell (120); the upper shell (110) and the lower shell (120) are buckled and arranged to enclose the accommodating cavity (101); the upper shell (110) and the lower shell (120) are sealed; at least one of the upper shell (110) and the lower shell (120) is provided with the fin assembly (200); and the air intake of the exhaust pipe (300) is connected to at least one of the upper shell (110) and the lower shell (120).

3. The naturally cooled battery box according to claim 2, characterized in that: The upper shell (110) and the lower shell (120) have the same structure. The upper shell (110) and the lower shell (120) are symmetrically arranged about the central axis of the naturally cooled battery box along the first direction, and the upper shell (110) and the lower shell (120) are symmetrically arranged about the central axis of the naturally cooled battery box along the second direction.

4. The naturally cooled battery box according to claim 2, characterized in that: The exhaust pipe (300) comprises a first tube shell (310) and a second tube shell (320); the first tube shell (310) is connected to the upper shell (110), and the second tube shell (320) is connected to the lower shell (120); the first tube shell (310) and the second tube shell (320) are buckled together to form the exhaust pipe (300); the first tube shell (310) and the second tube shell (320) are sealed and connected to each other.

5. The naturally cooled battery box according to claim 1, characterized in that: The naturally cooled battery box comprises a connecting piece, the exhaust end of the exhaust pipe (300) is provided with a fixing edge (330), the fixing edge (330) extends outwardly along the radial direction of the exhaust pipe (300), the fixing edge (330) is provided with a first fixing hole (331), the blocking cover (400) is provided with a second fixing hole (410), the connecting piece is passed through the first fixing hole (331) and the second fixing hole (410), and the connecting piece detachably connects the blocking cover (400) and the exhaust pipe (300).

6. The naturally cooled battery box according to claim 1, characterized in that: The naturally cooled battery box comprises a cooling fan, and the cooling fan is arranged on one side of the fin assembly (200).

7. The naturally cooled battery box according to claim 6, characterized in that: The fin assembly (200) comprises a plurality of first heat dissipation fins (210) and a plurality of second heat dissipation fins (220), wherein the plurality of first heat dissipation fins (210) and the plurality of second heat dissipation fins (220) extend in the same direction and are arranged at intervals; The height of the second heat dissipation fin (220) is lower than the height of the first heat dissipation fin (210), so that a groove (201) for accommodating the heat dissipation fan is formed at the second heat dissipation fin (220); or the height of at least part of the second heat dissipation fin (220) is lower than the height of the first heat dissipation fin (210), so that a groove (201) for accommodating the heat dissipation fan is formed at a position where the height of the second heat dissipation fin (220) is lower than that of the first heat dissipation fin (210).

8. The naturally cooled battery box according to claim 1, characterized in that: Support columns (130) are provided at four corners of the housing (100), and the support columns (130) are used to support the housing (100). The height of the support columns (130) is higher than the height of the fin assembly (200).

9. A battery pack, characterized in that: It comprises a battery module and a naturally cooled battery box according to any one of claims 1 to 8, wherein the battery module is arranged in the naturally cooled battery box.

10. An energy storage system, characterized in that: It comprises an air intake device and the battery pack as claimed in claim 9, wherein the air intake device is selectively connected to the exhaust pipe (300) of the naturally cooled battery box, and the air intake device is used to exhaust the gas in the naturally cooled battery box.

Images