Energy storage system

Abstract

The energy storage system according to the present invention comprises: a battery rack having at least one battery module; a container having an inner space for accommodating the battery rack; and a combustible gas reduction unit provided inside the container and generating sparks at predetermined time intervals to burn combustible gas to prevent the combustible gas from being accumulated in the inner space of the container.

Description

Energy storage systems

[0001] The present invention relates to an energy storage system, and more specifically, to an energy storage system including a flammable gas reduction device capable of preventing explosions caused by flammable gas.

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0171147 filed on November 26, 2024, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

[0003] An energy storage system refers to a system that receives and stores external power from an external power source, such as a power plant, and transmits it to where it is needed when it is required. In other words, an energy storage system is a large-capacity power storage system that includes batteries to store electricity and enable its use at the necessary location and time. Accordingly, it is currently gaining prominence for the storage of new and renewable energy (such as solar and wind power).

[0004] Lithium-ion batteries are currently used in energy storage systems. While conventional batteries lose some stored electricity due to self-discharge, lithium-ion batteries do not exhibit this phenomenon. They also have high storage capacity per unit volume and can store even small amounts of electricity generated from residential solar power without issue. Furthermore, they do not exhibit the memory effect—a weakness of other batteries where capacity decreases when charged while electricity is still present. These characteristics are the reason for the enhanced storage capabilities of lithium-ion batteries.

[0005] Energy storage systems are typically constructed by loading battery modules, consisting of lithium-ion batteries, inside a container. A certain number of these battery modules are electrically connected to each other and stacked on multi-tiered battery racks.

[0006] Since these energy storage systems have very high energy density, safety devices are essential to address risks such as fire and explosion caused by battery overheating.

[0007] For example, flammable gas may leak from a battery when it overheats, and if the concentration of flammable gas in the interior space of a container exceeds a certain level, an explosion can occur even from a weak spark. Such explosions cause more catastrophic damage than simple flames. Accordingly, conventional energy storage systems manage the concentration of flammable gas by ventilating the air inside the container using a fan or fan duct.

[0008] However, as the internal space of the container increases, the capacity of the ventilation fan or fan duct must also increase. In this case, there is a problem in that the capacity of the UPS power supply must also increase to operate the ventilation fan or fan duct. Furthermore, since the ventilation fan or fan duct may not operate due to breakdowns or errors by the manager, it is often pointed out that managing the concentration of flammable gases inside the container solely with the aforementioned ventilation fan or fan duct is insufficient.

[0009] The present invention was devised in consideration of the above-mentioned problems, and the objective of the present invention is to provide an energy storage system having a flammable gas reduction device so as not to accumulate flammable gas inside a container housing battery racks.

[0010] The technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by those skilled in the art from the description of the invention below.

[0011] According to one aspect of the present invention, an energy storage system may be provided comprising: a battery rack having at least one battery module; a container having an internal space accommodating the battery rack; and a combustible gas reduction unit provided inside the container, which generates a spark at predetermined time intervals to burn the combustible gas and prevent the accumulation of combustible gas in the internal space of the container.

[0012] The above flammable gas reduction unit may be configured to operate when the concentration of flammable gas inside the container is below the Lower Explosion Level.

[0013] The above-described combustible gas reduction unit may include a spark generating unit composed of: a spark plug that generates a spark; an ignition coil that is coupled to the spark plug and supplies electricity to the spark plug; and a control unit connected to the ignition coil and controlling the spark generating unit to generate a spark at predetermined time intervals.

[0014] The above-mentioned combustible gas reduction unit may further include a bracket member that supports the spark generating unit and the control unit and is fixedly coupled to one side of the container.

[0015] The above bracket member may include: a plate-shaped substrate mounting plate to which the control unit, implemented as a printed circuit board, is attached; and a plug support plate arranged perpendicularly to the substrate mounting plate and having a through hole through which the spark generating unit passes in the thickness direction.

[0016] The bracket member may further include a first cover plate extending in the longitudinal direction of the spark plug from the corner of the plug support plate; and a second cover plate bent and extended from one end of the first cover plate and arranged parallel to the plug support plate.

[0017] The above-mentioned combustible gas reduction unit may be installed in the container such that it is positioned in the upper space of the battery rack and the first cover plate covers the lower part of the spark plug.

[0018] The first cover plate may be provided with a through hole allowing ventilation and a mesh covering the through hole.

[0019] The above control unit may be configured to control the spark generating unit so that a spark is generated at intervals of every 8 to 10 seconds.

[0020] The above container may further include a gas sensor for measuring the concentration of flammable gas accumulated inside, and the control unit may be configured to control the spark generation unit so that the spark generation cycle becomes shorter as the concentration of flammable gas measured by the gas sensor approaches the lower explosion level.

[0021] It may further include a ventilation unit installed on at least one side wall of the container and arranged to ventilate the internal air of the container.

[0022] The above container includes a virtual divided zone divided into two or more N zones along the longitudinal direction, and the combustible gas reduction unit is disposed at least one in the N zones, and each combustible gas reduction unit disposed in the N zones may be configured so that the spark generation cycle changes individually based on the concentration of combustible gas measured in each of the N zones.

[0023] According to one aspect of the present invention, an energy storage system having a flammable gas reduction device can be provided so that flammable gas is not accumulated inside a container accommodating battery racks.

[0024] In addition, according to one aspect of the present invention, the explosion of an energy storage system can be prevented by continuously burning a flammable gas with a spark generated at predetermined time intervals so that the concentration of the flammable gas does not reach the lower explosive limit (LEL).

[0025] The effects of the present invention are not limited to the effects described above, and unmentioned effects will be clearly understood by those skilled in the art from this specification and the attached drawings.

[0026] FIG. 1 is a schematic perspective view of an energy storage system according to one embodiment of the present invention.

[0027] Figure 2 is a schematic drawing of the interior of the container of Figure 1.

[0028] FIG. 3 is a schematic perspective view showing the configuration of a combustible gas reduction unit according to one embodiment of the present invention.

[0029] FIG. 4 is a drawing showing a combustible gas reduction unit installed on the ceiling of a container according to one embodiment of the present invention.

[0030] Figure 5 is an enlarged view of the ignition plug portion of the combustible gas reduction unit of Figure 4.

[0031] FIG. 6 is a diagram showing an example of operation of a combustible gas reduction unit according to one embodiment of the present invention.

[0032] FIG. 7 is a graph showing the relationship between the flammable gas concentration inside a container and the spark generation cycle of an occupancy plug according to one embodiment of the present invention.

[0033] FIG. 8 is a drawing showing a ventilation unit according to one embodiment of the present invention.

[0034] FIG. 9 is a schematic diagram illustrating the interior of a container according to another embodiment of the present invention.

[0035] FIG. 10 is a graph showing the relationship between the flammable gas concentration inside a container and the spark generation cycle of an occupancy plug according to another embodiment of the present invention.

[0036] FIG. 11 is a schematic diagram illustrating the arrangement of combustible gas reduction units provided inside a container according to another embodiment of the present invention.

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0038] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0039] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0040] FIG. 1 is a schematic perspective view of an energy storage system according to one embodiment of the present invention, FIG. 2 is a schematic view of the interior of the container of FIG. 1, FIG. 3 is a schematic perspective view of the configuration of a combustible gas reduction unit according to one embodiment of the present invention, and FIG. 4 is a drawing showing a combustible gas reduction unit installed on the ceiling of a container according to one embodiment of the present invention.

[0041] With reference to these drawings, an energy storage system (10) according to one embodiment of the present invention includes at least one battery rack (100), a container (200), and a combustible gas reduction unit (300).

[0042] The battery rack (100) may be provided in multiple quantities. The battery rack (100) may include battery modules (110), a rack housing (120) capable of stacking and storing the battery modules (110), a cooling fan for cooling the battery modules (110), and a battery control device for managing the charging and discharging of the battery modules (110).

[0043] The rack housing (120) generally has a rectangular cabinet shape and has a space for accommodating multiple battery modules (110) inside. The front of the rack housing (120) can be implemented in the form of a mesh-type door that allows for opening and closing and ventilation, and the rear of the rack housing (120) can have a shape in which a part of the wall is cut out so that a cooling fan can be installed inside and outside. The cooling fan can be mounted on one side of the battery module (110) inside the rack housing (120) and configured to guide the flow of cooling air into the interior of the battery module (110).

[0044] The battery module (110) includes battery cells. The battery cells, as secondary batteries, may be composed of at least one of a pouch-type secondary battery, a prismatic secondary battery, and a cylindrical secondary battery.

[0045] The above container (200) is a structure having an internal space and can be configured to accommodate the battery racks (100) and various devices necessary for maintaining and managing the battery racks (100) inside.

[0046] The above-mentioned combustible gas reduction unit (300) is placed inside the container (200) as a means to remove combustible gas generated, for example, when a battery cell overheats. Here, the combustible gas is a gas that can combine with oxygen in the air to cause combustion, has a low ignition point, can easily ignite even with a small flame or spark, and poses a risk of explosion under certain conditions. The combustible gas may be hydrogen or methane.

[0047] The combustible gas reduction unit (300) may preferably be mounted on the ceiling (201) of the container (200). The combustible gas reduction unit (300) may be configured to prevent combustible gas from accumulating in the interior space of the container (200) by generating a spark at predetermined time intervals to burn the combustible gas.

[0048] For example, a flammable gas does not explode in a confined space if its concentration is below a predetermined Lower Explosive Limit (LEL), but it may explode if it exceeds the said Lower Explosive Limit and an ignition source is present. Here, the said Lower Explosive Limit refers to the minimum concentration at which a flammable gas can react with an ignition source to cause an explosion. For example, the Lower Explosive Limit of hydrogen is known to be 4.0 vol% and the Lower Explosive Limit of methane is known to be 5.0 vol%.

[0049] The combustible gas reduction unit (300) according to the present embodiment eliminates the risk of explosion by causing the combustible gas inside the container (200) to be consumed before the concentration of combustible gas inside the container (200) reaches the explosion lower limit concentration.

[0050] The combustible gas reduction unit (300) may be configured to operate when the concentration of combustible gas inside the container (200) is below the explosion lower limit concentration and to stop operating when it exceeds the explosion lower limit concentration. To this end, a gas sensor (500) for measuring the concentration of combustible gas may be provided inside the container (200). The combustible gas reduction unit (300) may be configured to receive combustible gas concentration data from the gas sensor (500) and to stop operating when a specific value is received that is close to the explosion lower limit concentration.

[0051] The configuration of a combustible gas reduction unit (300) according to one embodiment of the present invention will be described in more detail below.

[0052] Referring to FIG. 3, a combustible gas reduction unit (300) according to one embodiment of the present invention includes a spark generating unit (310) and a control unit (320).

[0053] The spark generating unit (310) may be configured to include a spark plug (311) and an ignition coil (312).

[0054] The spark plug (311) is a component that generates an electric discharge spark, and any component that generates an electric discharge spark is acceptable.

[0055] The ignition coil (312) is a component that is coupled to the spark plug (311) and supplies electricity to the spark plug (311). The ignition coil (312) may include an induction coil that converts a low voltage to thousands to tens of thousands of volts required to generate a spark in the spark plug (311). For example, the ignition coil (312) may be configured to step up a voltage of 24V to 20KV and supply it to the spark plug (311).

[0056] The control unit (320) may be implemented as a printed circuit board. The control unit (320) may be electrically connected to the ignition coil (312). The control unit (320) and the ignition coil (312) may be connected by a connection means such as a cable connector (not shown), for example.

[0057] The control unit (320) may be configured to control the spark generating unit (310) so that a spark is generated at the spark plug (311) at predetermined time intervals. For example, the control unit (320) may be configured to include an oscillator to discontinuously supply low voltage to the ignition coil (312), thereby causing a spark to be generated at the spark plug (311) at a cycle of, for example, 8 to 10 seconds.

[0058] Additionally, the combustible gas reduction unit (300) may further include a bracket member (330) that supports the spark generating unit (310) and the control unit (320) and is fixedly coupled to one side of the container (200).

[0059] The above bracket member (330) may include a substrate mounting plate (331) and a plug support plate (332), as shown in FIG. 3.

[0060] The above-mentioned substrate mounting plate (331) may be provided in the form of a plate to which a control unit (320), implemented as a printed circuit board, can be attached. For example, the above-mentioned printed circuit board may be configured so that its four corner regions can be bolted to the substrate mounting plate (331).

[0061] The above-mentioned substrate mounting plate (331) may be provided with a bolt fastening part (331a) that can be bolted and brought into contact with the outer wall surface of the container (200) on at least one side.

[0062] The plug support plate (332) serves to support the spark generating part (310), is positioned vertically with respect to the substrate mounting plate (331), and may be provided with a first through hole through which the spark generating part (310) passes in the thickness direction.

[0063] For example, as shown in FIG. 3, the ignition coil (312) can be inserted into the through hole of the plug support plate (332) and fixed at one end. A reinforcing plate (333) may be further provided at a position spaced apart from the plug support plate (332) by a predetermined distance. The reinforcing plate (333) may have a second through hole formed in the thickness direction. The ignition coil (312) can be inserted into the first through hole and the second through hole, and supported at two locations by the plug support plate (332) and the reinforcing plate (333).

[0064] Additionally, the bracket member (330) may further include a first cover plate (334) extending in the longitudinal direction of the spark plug (311) from the corner of the plug support plate (332), and a second cover plate (335) bent and extended from one end of the first cover plate (334) and arranged parallel to the plug support plate (332).

[0065] Together with the plug support plate (332), the first cover plate (334) and the second cover plate (335) are provided in a form that surrounds the ignition plug (311) to protect the ignition plug (311) portion, while also serving to protect the ignition coil (312) and the control unit (320) from the flame when a spark and flammable gas react to instantaneously generate a flame.

[0066] A combustible gas reduction unit (300) having such a configuration can be installed on the ceiling of a container (200) so as to be located in the upper space of battery racks (100), as shown in FIGS. 2 and 4.

[0067] For example, combustible gases such as hydrogen or methane are significantly lighter than air and have a strong tendency to move upward. Therefore, as in this embodiment, if the combustible gas reduction unit (300) is installed on the ceiling (201) of the container (200), contact between the spark periodically generated from the ignition plug (311) and the combustible gas is smooth compared to when it is installed on the side wall or floor of the container (200), allowing the combustible gas to be burned and removed more efficiently.

[0068] As shown in FIGS. 4 to 6, the combustible gas reduction unit (300) may be configured such that when installed on the ceiling (201) of the container (200), the first cover plate (334) covers the lower part of the ignition plug (311). The first cover plate (334) may have a through hole allowing ventilation and a mesh net (334a) covering the through hole.

[0069] According to this configuration, flammable gas can move from the up, down, left, right, front, and back directions and come into contact with the ignition plug (311). And when the flammable gas reacts with the spark generated from the ignition plug (311) and burns, the flame can be blocked from moving downward by the mesh net (334a), thereby protecting the battery racks (100).

[0070] According to the combustible gas reduction unit (300) according to the present embodiment, sparks can be continuously generated at predetermined intervals 'T1' regardless of the concentration of combustible gas at or below the explosion lower limit concentration, as shown in FIG. 7. For example, the sparks can be generated at intervals of 8 to 10 seconds. In other words, the control unit (320) according to one embodiment of the present invention can be configured to control the spark generation unit (310) so that sparks are generated at intervals of 8 to 10 seconds regardless of the concentration of combustible gas at or below the explosion lower limit concentration.

[0071] According to this flammable gas reduction unit (300), even if flammable gas is generated in the battery cells inside the container (200), the flammable gas reacts with a spark at intervals of 8 to 10 seconds and burns, so that the concentration of the flammable gas does not rise to the lower explosive limit concentration (LEL). Therefore, the energy storage system (10) according to the present invention has a significantly lower risk of explosion accidents caused by flammable gas.

[0072] Meanwhile, the energy storage system (10) according to the present embodiment may further include a ventilation unit (400) installed on at least one side wall of the container (200) and configured to ventilate the internal air of the container (200), as shown in FIGS. 1 to 2 and FIGS. 8.

[0073] The ventilation unit (400) may include a duct (410) communicating with the internal space of the container (200), a shutter (420) for opening and closing a passage inside the duct (410), and a fan member (430) coupled to the duct (410) for controlling the flow of air. The shutter (420) may be configured to open and close automatically by an electric damper. The ventilation unit (400) may reduce the concentration of combustible gas inside the container (200) together with the combustible gas reduction unit (300) by discharging combustible gas from the inside of the container (200) to the outside and introducing air from the outside of the container (200) to the inside.

[0074] FIG. 9 is a schematic diagram illustrating the interior of a container according to another embodiment of the present invention.

[0075] FIG. 10 is a graph showing the relationship between the flammable gas concentration inside a container and the spark generation cycle of an occupancy plug according to another embodiment of the present invention.

[0076] Next, an energy storage system according to another embodiment of the present invention will be briefly described with reference to FIGS. 9 and FIGS. 10.

[0077] The same reference numbers as those in the aforementioned embodiments indicate the same components. Duplicate descriptions of the same components will be omitted, and the description will focus on the differences from the aforementioned embodiments.

[0078] An energy storage system according to another embodiment of the present invention further includes a gas sensor (500) for measuring the concentration of flammable gas accumulated inside the container (200), and the control unit (320) may be configured to control the spark generation unit (310) so that the spark generation cycle becomes shorter as the concentration of flammable gas measured by the gas sensor (500) approaches the lower explosion level.

[0079] For example, as shown in FIG. 9, at least one gas sensor (500) may be installed on the ceiling (201) of the container (200). The gas sensor (500) may be configured to measure the concentration of flammable gas inside the container (200) in real time, and the measured gas may be transmitted to the control unit (320) of the flammable gas reduction unit (300).

[0080] The control unit (320) above may be configured to change the spark generation cycle according to the concentration of flammable gas even before the explosion lower limit concentration (LEL). For example, according to another embodiment of the present invention, as shown in FIG. 10, if the concentration of flammable gas increases from 'S1' to 'S2', the spark generation cycle may be shortened from 'T4' to 'T3'. That is, if the concentration of flammable gas increases from 'S1' to 'S2' to 'S3' to 'S4', the control unit (320) may be configured to control the spark generation unit (310) so that the spark generation cycle is shortened from 'T4' to 'T3' to 'T2' to 'T1'. In this case, the flammable gas inside the container (200) may be reduced more quickly than in the previously described embodiment.

[0081] FIG. 11 is a schematic diagram illustrating the arrangement of combustible gas reduction units (300) provided inside a container (200) according to another embodiment of the present invention.

[0082] A container (200) according to another embodiment of the present invention may include a virtual divided section divided into N sections along the longitudinal direction. And a combustible gas reduction unit (300) may be disposed of at least one in each of the N sections. (Here, N means an integer greater than or equal to 2)

[0083] Each of the above-mentioned combustible gas reduction units (300) placed in the above-mentioned N zones may be configured to individually change the spark generation cycle based on the concentration of combustible gas measured in each of the above-mentioned N zones.

[0084] For example, as illustrated in FIG. 11, the container (200) may include a virtual divided area divided into four sections along the longitudinal direction (Y-direction). A first combustible gas reduction unit (300A) and a first gas sensor (500A) may be installed in the first section, a second combustible gas reduction unit (300B) and a second gas sensor (500B) may be installed in the second section, a third combustible gas reduction unit (300C) and a third gas sensor (500C) may be installed in the third section, and a fourth combustible gas reduction unit (300D) and a fourth gas sensor (500D) may be installed in the fourth section.

[0085] The concentration of flammable gas may vary in each zone depending on the volume of the container (200), the difference in distance from the ventilation unit (400), and the location of the battery rack (100) containing the battery cell where the event occurred. For example, the frequency of occurrence and accumulation rate of flammable gas may be higher in the central area of ​​the container (200), which is relatively far from the ventilation unit (400) and prone to heat island phenomena, compared to the two edge areas of the container (200).

[0086] An energy storage system (10) according to another embodiment of the present invention may be configured such that, for example, if the concentration of combustible gas measured by the third gas sensor (500C) is higher than the concentration of combustible gas measured by the first gas sensor (500A), the spark generation cycle of the third combustible gas reduction unit (300C) is shortened compared to the spark generation cycle of the first combustible gas reduction unit (300A). In this case, the combustible gas in the third zone may be depleted faster than the combustible gas in the first zone. Thus, by operating the combustible gas reduction units (300) according to another embodiment of the present invention, the concentration of combustible gas in the first to fourth zones can be reduced more uniformly.

[0087] As described above, the energy storage system (10) equipped with a combustible gas reduction unit (300) according to the present invention can prevent the explosion of the energy storage system (10) by burning the combustible gas before reaching the explosion lower limit concentration when combustible gas is generated inside the container (200).

[0088] Although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention pertains. Furthermore, the meaning and scope of these claims, as well as all possible modifications and variations derived from equivalent concepts, should be interpreted as being included within the scope of the present invention.

[0089] In addition, although terms indicating directions such as up, down, left, and right have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to those skilled in the art that they may vary depending on the location of the object or the position of the observer.

Claims

1. A battery rack having at least one battery module; A container having an internal space for accommodating the battery rack; and An energy storage system characterized by including a combustible gas reduction unit provided inside the container and generating a spark at predetermined time intervals to burn the combustible gas, thereby preventing the accumulation of combustible gas in the internal space of the container.

2. In Paragraph 1, An energy storage system characterized in that the above-mentioned combustible gas reduction unit is configured to operate within the container at a concentration of combustible gas below the Lower Explosion Level.

3. In Paragraph 1, The above-mentioned combustible gas reduction unit is, A spark generating unit comprising: a spark plug that generates a spark; an ignition coil that is coupled to the spark plug and supplies electricity to the spark plug; and An energy storage system comprising a control unit connected to the ignition coil and controlling the spark generating unit to generate a spark at predetermined time intervals.

4. In Paragraph 3, The above-mentioned combustible gas reduction unit is, An energy storage system characterized by further including a bracket member that supports the spark generating unit and the control unit and is fixedly coupled to one side of the container.

5. In Paragraph 4, The above bracket member is, A plate-shaped substrate mounting plate to which the control unit implemented as a printed circuit board is attached; and An energy storage system characterized by including a plug support plate that is positioned perpendicularly to the substrate mounting plate and has a through hole through which the spark generating part passes in the thickness direction.

6. In Paragraph 5, The above bracket member is, An energy storage system characterized by further comprising: a first cover plate extending in the longitudinal direction of the spark plug from the corner of the plug support plate; and a second cover plate bent and extended from one end of the first cover plate and arranged parallel to the plug support plate.

7. In Paragraph 6, The above-mentioned combustible gas reduction unit is, An energy storage system characterized by being positioned in the upper space of the battery rack and installed in the container such that the first cover plate covers the lower part of the spark plug.

8. In Paragraph 6, An energy storage system characterized in that the first cover plate has a through hole allowing ventilation and a mesh covering the through hole.

9. In Paragraph 3, The above control unit is, An energy storage system characterized by controlling the spark generating unit to generate a spark at intervals of 8 to 10 seconds.

10. In Paragraph 3, It further includes a gas sensor for measuring the concentration of flammable gas accumulated inside the container, and The energy storage system is characterized by the above-described control unit controlling the spark generation unit such that the spark generation cycle becomes shorter as the concentration of flammable gas measured by the gas sensor approaches the lower explosion level.

11. In Paragraph 1, An energy storage system characterized by further including a ventilation unit installed on at least one side wall of the container and arranged to ventilate the internal air of the container.

12. In Paragraph 3, The above container includes a virtual partitioned area divided into two or more N zones along the length direction, and The above flammable gas reduction unit is An energy storage system characterized by having at least one unit disposed in each of the N zones, and each of the combustible gas reduction units disposed in the N zones configured such that the spark generation cycle changes individually based on the concentration of combustible gas measured in each of the N zones.

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