energy storage system

Abstract

An energy storage system according to the present disclosure includes a battery rack including at least one battery module, a container having an internal space for accommodating the battery rack, and a combustible gas reduction unit disposed inside the container and combusting combustible gas by generating a spark at a predetermined time interval to prevent accumulation of the combustible gas in the internal space of the container.

Description

Technical Field

[0001] This disclosure relates to energy storage systems, and more specifically to an energy storage system including a combustible gas reduction device that can prevent explosions caused by combustible gases.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2024-0171147, filed with the Korean Intellectual Property Office on November 26, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[0003] Energy storage systems are systems that receive and store electricity from external power sources (such as power plants) and then transmit it to where it is needed when required. In other words, an energy storage system is a large-capacity electricity storage system that includes batteries for storing electricity and supports storing electricity for use at the location and time of need. Therefore, it is currently receiving considerable attention for storing renewable energy sources (solar, wind, etc.).

[0004] Currently, lithium-ion batteries are used in energy storage systems. While conventional batteries typically lose some stored energy due to self-discharge, lithium-ion batteries do not exhibit this phenomenon. Lithium-ion batteries have a high energy storage capacity per unit volume, and storing even small amounts of electricity generated by residential solar power is not a problem. Lithium-ion batteries do not exhibit the drawback of other conventional batteries when charging, namely, the memory effect, which causes a decrease in battery capacity when charging while the battery still has some charge. It is this characteristic that enhances the storage performance of lithium-ion batteries.

[0005] Typically, energy storage systems are configured by mounting battery modules, consisting of lithium-ion batteries, in a container. A number of these battery modules are mounted in a multi-layered battery rack by being electrically connected to each other.

[0006] Because of the extremely high energy density of this type of energy storage system, safety devices must be used to address risks such as fires and explosions caused by battery overheating.

[0007] For example, when a battery overheats, flammable gases may leak from it. If the concentration of flammable gases inside the container reaches a certain level, even a small flame could cause an explosion. Such an explosion can be more destructive than a simple flame. Therefore, traditional energy storage systems control the concentration of flammable gases by using fans or ducts to ventilate the air inside the container.

[0008] However, as the internal space of the container increases, the capacity of the ventilator or duct should also increase. In this case, a problem arises: the capacity of the UPS power supply must also be increased to drive the ventilator or duct. Furthermore, the ventilator or duct may become inoperable due to malfunctions or operator error; therefore, many argue that relying solely on ventilators or ducts to manage the concentration of flammable gases inside the container is insufficient. Summary of the Invention

[0009] Technical issues

[0010] The present invention aims to solve the above-mentioned problems. Therefore, the present invention aims to provide an energy storage system with a combustible gas reduction device to prevent combustible gas from accumulating inside the container housing the battery rack.

[0011] The technical problems to be solved by this disclosure are not limited to those described above. Other problems not mentioned herein can be clearly understood by those skilled in the art from the following description of this disclosure.

[0012] Technical solution

[0013] According to one aspect of this disclosure, an energy storage system may be provided, comprising: a battery rack including at least one battery module; a container having an internal space for accommodating the battery rack; and a combustible gas reduction unit disposed inside the container and preventing the combustible gas from accumulating in the internal space of the container by generating sparks at predetermined time intervals to burn the combustible gas.

[0014] The combustible gas reduction unit can be configured to operate when the concentration of combustible gas inside the container reaches below the lower explosive limit.

[0015] The combustible gas reduction unit may include: a spark generating unit including a spark plug and an ignition coil, the spark plug generating a spark, the ignition coil being connected to the spark plug and configured to provide power to the spark plug; and a control unit connected to the ignition coil and configured to control the spark generating unit to generate sparks at predetermined time intervals.

[0016] The combustible gas reduction unit may also include a support member that supports the spark generating unit and the control unit and is fixedly connected to one side of the container.

[0017] The support components may include: a plate-shaped panel mounting plate to which a control unit, implemented as a printed circuit board, is attached; and a plug support plate disposed perpendicular to the panel mounting plate and having through holes in the thickness direction for the spark generating unit to pass through.

[0018] The support component may further include: a first cover plate extending from the edge of the plug support plate along the length of the spark plug; and a second cover plate bent and extending from one end of the first cover plate and disposed parallel to the plug support plate.

[0019] The combustible gas reduction unit can be located 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.

[0020] The first cover plate may have ventilation holes that allow ventilation and a mesh cover that covers the ventilation holes.

[0021] The control unit can be configured to control the spark generating unit to generate sparks at intervals of 8 to 10 seconds.

[0022] The energy storage system may also include a gas sensor that measures the concentration of combustible gas accumulated inside the container, wherein the control unit may be configured to control the spark generation unit such that the spark generation cycle is shortened when the concentration of combustible gas measured by the gas sensor approaches the lower explosive limit.

[0023] The energy storage system may also include a ventilation unit mounted on at least one side wall of the container and configured to ventilate the internal air of the container.

[0024] The container may include a virtual partition area, which is divided into two or more N regions along the length direction. At least one combustible gas reduction unit may be provided in each of the N regions, and each combustible gas reduction unit provided in each of the N regions is configured to individually change the spark generation cycle based on the concentration of combustible gas measured in each of the N regions.

[0025] Invention Effects

[0026] According to one aspect of this disclosure, an energy storage system may be provided having a combustible gas reduction device to prevent combustible gas from accumulating inside a container housing a battery rack.

[0027] Furthermore, according to one aspect of the invention, the concentration of combustible gas can be prevented from reaching the lower explosive limit (LEL) by continuously burning combustible gas with sparks generated at predetermined time intervals, thereby preventing the energy storage system from exploding.

[0028] The effects obtained through this disclosure are not limited to those described above. Other effects not mentioned herein can be clearly understood by those skilled in the art from this specification and the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a schematic perspective view of an energy storage system according to an embodiment of the present disclosure.

[0030] Figure 2 It is shown schematically. Figure 1 A view inside the container.

[0031] Figure 3 This is a perspective view schematically illustrating the construction of a combustible gas reduction unit according to an embodiment of the present disclosure.

[0032] Figure 4 This is a view showing a combustible gas reduction unit mounted on the top plate of a container according to an embodiment of the present disclosure.

[0033] Figure 5 It is shown Figure 4 An enlarged view of the spark plug section of the combustible gas reduction unit.

[0034] Figure 6 This is a view illustrating an operational example of a combustible gas reduction unit according to an embodiment of the present disclosure.

[0035] Figure 7 This is a graph showing the relationship between the concentration of combustible gas inside a container and the spark generation cycle of a spark plug according to an embodiment of the present invention.

[0036] Figure 8 This is a view showing a ventilation unit according to an embodiment of the present disclosure.

[0037] Figure 9 This is a schematic view of the interior of a container according to another embodiment of the invention.

[0038] Figure 10 This is a graph showing the relationship between the concentration of combustible gas inside the container and the spark generation cycle of the spark plug according to another embodiment of the present invention.

[0039] Figure 11 This is a schematic view illustrating the arrangement of a combustible gas reduction unit disposed inside a container according to yet another embodiment of the present disclosure. Detailed Implementation

[0040] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its generic or dictionary meaning, but rather should be interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle that inventors are allowed to appropriately define terms for the best interpretation. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely some of the most preferred embodiments of the present disclosure and are not intended to represent all aspects of the present disclosure. It should be understood that various equivalent substitutions and modifications can be made thereto when this application is filed.

[0041] Additionally, in describing this disclosure, a detailed description of a known configuration or function will be omitted if it is determined that such a description may obscure the main points of this disclosure.

[0042] Because the embodiments of this disclosure are provided to describe the disclosure more fully to those skilled in the art, the shapes and dimensions of the components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the size or proportion of the individual components does not perfectly reflect their actual size or proportion.

[0043] Figure 1 This is a schematic perspective view of an energy storage system according to an embodiment of the present disclosure. Figure 2 It is shown schematically. Figure 1 A view inside the container. Figure 3 This is a perspective view schematically illustrating the construction of a combustible gas reduction unit according to an embodiment of the present disclosure, and Figure 4 This is a view showing a combustible gas reduction unit mounted on the top plate of a container according to an embodiment of the present disclosure.

[0044] Referring to these figures, an energy storage system 10 according to one embodiment of the present disclosure includes at least one battery rack 100, a container 200, and a combustible gas reduction unit 300.

[0045] Multiple battery racks 100 may be provided. Each battery rack 100 may include: multiple battery modules 110; a rack housing 120 capable of stacking and accommodating multiple battery modules 110; a cooling fan for cooling the multiple battery modules 110; and a battery control device for managing the charging and discharging of the multiple battery modules 110.

[0046] The housing 120 is generally rectangular in shape and has space for accommodating multiple battery modules 110 therein. The front of the housing 120 may be implemented as a mesh door for opening, closing, and ventilation, and the rear of the housing 120 may have a shape in which a portion of its wall surface is cut off to allow cooling fans to be installed internally and externally. The cooling fans may be configured to be mounted on one side of the battery modules 110 within the housing 120 and to direct cooling airflow into the battery modules 110.

[0047] The battery module 110 includes multiple battery cells. Each battery cell is a secondary battery and may consist of at least one of pouch-type secondary batteries, prismatic (square) secondary batteries, and cylindrical secondary batteries.

[0048] The container 200 is a structure with internal space and can be configured to accommodate multiple battery racks 100 and various devices necessary for the maintenance and management of the multiple battery racks 100 therein.

[0049] A combustible gas reduction unit 300 is installed inside the container 200 as a device for eliminating combustible gases, for example, generated 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, is easily ignited by a small flame or spark, and poses an explosion hazard under certain conditions. The combustible gas can be hydrogen or methane.

[0050] Preferably, the combustible gas reduction unit 300 can be installed on the top plate 201 of the container 200. The combustible gas reduction unit 300 can be configured to prevent combustible gas from accumulating in the interior space of the container 200 by generating sparks at predetermined time intervals to burn the combustible gas.

[0051] For example, if the concentration of a combustible gas in a confined space is below a predetermined lower explosive limit (LEL), the gas will not explode. However, if the concentration exceeds the LEL and an ignition source is present, the gas may explode. Here, the lower explosive limit (LEL) refers to the minimum concentration at which a combustible gas can react with an ignition source to cause an explosion. For example, the LEL for hydrogen is known to be 4.0 vol%, and the LEL for methane is known to be 5.0 vol%.

[0052] According to this embodiment, the combustible gas reduction unit 300 eliminates the risk of explosion by reducing the concentration of combustible gas in the container 200 before it reaches the lower explosive limit concentration.

[0053] The combustible gas reduction unit 300 can be configured to operate when the concentration of combustible gas within the container 200 reaches below the lower explosive limit (LEL) concentration, and to stop operating when the concentration exceeds the LEL concentration. For this purpose, a gas sensor 500 for measuring the combustible gas concentration can be installed inside the container 200. The combustible gas reduction unit 300 receives combustible gas concentration data from the gas sensor 500 and can be configured to stop operating when the received concentration data approaches a specific LEL concentration.

[0054] The construction of a combustible gas reduction unit 300 according to an embodiment of the present disclosure will be described in more detail below.

[0055] Reference Figure 3 According to one embodiment of the present disclosure, a combustible gas reduction unit 300 includes a spark generating unit 310 and a control unit 320.

[0056] The spark generating unit 310 may include a spark plug 311 and an ignition coil 312.

[0057] Spark plug 311 is a component that generates an electrical spark, and any component that generates an electrical spark can be used.

[0058] Ignition coil 312 is a component interconnected with and supplying power to spark plug 311. Ignition coil 312 may include an induction coil that converts a low voltage into the thousands to tens of thousands of volts required to generate a spark in spark plug 311. For example, ignition coil 312 may be configured to boost a 24 V voltage to 20 kV and supply the boosted voltage to spark plug 311.

[0059] 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 via a connector such as a cable connector (not shown).

[0060] The control unit 320 may be configured to control the spark generating unit 310 to generate a spark in the spark plug 311 at predetermined time intervals. For example, the control unit 320 may include an oscillator configured to supply a low voltage to the ignition coil 312 in a discontinuous manner, thereby causing the spark plug 311 to generate a spark at a period of, for example, 8 to 10 seconds.

[0061] In addition, the combustible gas reduction unit 300 may also include a support member 330, which supports the spark generating unit 310 and the control unit 320 and is fixedly connected to one side of the container 200.

[0062] like Figure 3As shown, the bracket component 330 may include a panel mounting plate 331 and a plug support plate 332.

[0063] The panel mounting plate 331 can be plate-shaped, and the control unit 320, implemented as a printed circuit board, can be attached to the panel mounting plate 331. For example, the printed circuit board can be configured such that its four corner areas can be bolted to the panel mounting plate 331.

[0064] The panel mounting plate 331 may include a bolt fastening portion 331a on at least one side, which is capable of contacting and being bolted to the outer wall surface of the container 200.

[0065] The plug support plate 332 is used to support the spark generating unit 310, is set perpendicular to the panel mounting plate 331, and may have a first through hole in the thickness direction through which the spark generating unit 310 passes.

[0066] For example, the ignition coil 312 can be inserted into the through hole of the plug support plate 332, and one side can be fixed, such as... Figure 3 As shown. A reinforcing plate 333 can also be provided at a predetermined distance from the plug support plate 332. The reinforcing plate 333 may have a second through hole formed along the thickness direction. The ignition coil 312 can be inserted into the first through hole and the second through hole, and can be supported in two positions by the plug support plate 332 and the reinforcing plate 333.

[0067] In addition, the support member 330 may also include: a first cover plate 334 extending from the edge of the plug support plate 332 along the length direction of the spark plug 311; and a second cover plate 335 bending and extending from one end of the first cover plate 334 and disposed parallel to the plug support plate 332.

[0068] The first cover plate 334 and the second cover plate 335, together with the plug support plate 332, are arranged around the outer periphery of the spark plug 311. This can protect the spark plug 311 portion and can also be used to protect the ignition coil 312 and the control unit 320 from the flame when the spark reacts with the combustible gas to generate a flame instantaneously.

[0069] like Figure 2 and Figure 4 As shown, the combustible gas reduction unit 300 with this structure can be installed on the top plate of the container 200 to be positioned in the upper space of the plurality of battery racks 100.

[0070] For example, combustible gases (such as hydrogen or methane) are much lighter than air and tend to rise. Therefore, in this embodiment, when the combustible gas reduction unit 300 is installed on the top plate 201 of the container 200, the sparks periodically generated from the spark plug 311 can contact the combustible gas more smoothly than when the unit is installed on the side wall or bottom surface of the container 200, thereby enabling the combustible gas to burn and be removed more effectively.

[0071] The combustible gas reduction unit 300 can be configured such that when installed on the top plate 201 of the container 200, the first cover plate 334 covers the lower part of the spark plug 311, as shown below. Figures 4 to 6 As shown. The first cover plate 334 may have ventilation holes that allow ventilation and a mesh cover 334a that covers the ventilation holes.

[0072] According to this structure, the combustible gas can move in the up, down, left, right, front, and back directions and come into contact with the spark plug 311. Furthermore, when the combustible gas reacts with the spark generated by the spark plug 311 and burns, the downward movement of the flame can be blocked by the mesh cover 334a, thereby protecting the battery holder 100.

[0073] According to the combustible gas reduction unit 300 of this embodiment, such as Figure 7 As shown, when the concentration of combustible gas is below the lower explosive limit, sparks can be generated continuously at predetermined intervals 'T1', regardless of the concentration of combustible gas. For example, sparks can be generated at intervals of 8 to 10 seconds. In other words, the control unit 320 according to an embodiment of the present disclosure can be configured to control the spark generating unit 310 such that when the concentration of combustible gas reaches below the lower explosive limit, sparks are generated at intervals of 8 to 10 seconds, regardless of the concentration of combustible gas.

[0074] According to the combustible gas reduction unit 300, even if combustible gas is generated from the battery cells inside the container 200, the combustible gas reacts with the spark and burns at intervals of 8 to 10 seconds, thereby preventing the concentration of combustible gas from rising to the lower explosive limit (LEL). Therefore, the risk of explosion caused by combustible gas in the energy storage system 10 according to this disclosure is very low.

[0075] Additionally, the energy storage system 10 according to this embodiment may further include a ventilation unit 400, which is installed on at least one side wall of the container 200 and configured to ventilate the internal air of the container 200, such as... Figures 1 to 2 and Figure 8 As shown.

[0076] The ventilation unit 400 may include: a duct 410 communicating with the interior space of the container 200; a shutter 420 for opening and closing the passage inside the duct 410; and a fan component 430 connected to the duct 410 and controlling airflow. The shutter 420 may be configured to open and close automatically via an electric damper. The ventilation unit 400, together with the combustible gas reduction unit 300, reduces the concentration of combustible gases inside the container 200 by venting combustible gases from the interior of the container 200 to the exterior and introducing air from the exterior of the container 200 to the interior.

[0077] Figure 9 This is a schematic view of the interior of a container according to another embodiment of the present invention.

[0078] Figure 10 This is a graph showing the relationship between the concentration of combustible gas in a container and the spark generation cycle of a spark plug according to another embodiment of the present invention.

[0079] Next, we will refer to Figure 9 and Figure 10 A brief description of an energy storage system according to another embodiment of the present disclosure.

[0080] The same reference numerals as in the above embodiments denote the same parts, and repeated descriptions of the same parts will be omitted. The main focus will be on the differences from the above embodiments.

[0081] The energy storage system according to another embodiment of the present disclosure further includes a gas sensor 500 for measuring the concentration of combustible gas accumulated in the container 200, and the control unit 320 can be configured to control the spark generation unit 310 such that the spark generation cycle shortens as the concentration of combustible gas measured by the gas sensor 500 approaches the lower explosive limit concentration.

[0082] For example, such as Figure 9 As shown, at least one gas sensor 500 can be installed on the top plate 201 of the container 200. The gas sensor 500 can be configured to measure the concentration of combustible gas in the container 200 in real time and transmit the measured gas concentration to the control unit 320 of the combustible gas reduction unit 300.

[0083] The control unit 320 can be configured to change the spark generation cycle according to the concentration of combustible gas even before the lower explosive limit (LEL) is reached. For example, according to another embodiment of the invention, such as Figure 10As shown, when the concentration of combustible gas increases from "S1" to "S2", the spark generation cycle can be shortened from "T4" to "T3". That is, as the concentration of combustible gas gradually increases in the order "S1" → "S2" → "S3" → "S4", the control unit 320 can be configured to control the spark generation unit 310, causing the spark generation cycle to gradually shorten in the order "T4" → "T3" → "T2" → "T1". In this case, the combustible gas in the container 200 can be reduced faster than in the above embodiment.

[0084] Figure 11 This is a schematic view illustrating the arrangement of a combustible gas reduction unit 300 disposed inside a container 200 according to yet another embodiment of the present disclosure.

[0085] According to another embodiment of the present disclosure, the container 200 may include a virtual partition region divided into N regions along its length. Furthermore, at least one combustible gas reduction unit 300 may be provided in each of the N regions (where N represents an integer greater than or equal to 2).

[0086] Each combustible gas reduction unit 300 located in each of the N regions can be configured to individually change the spark generation cycle based on the concentration of combustible gas measured in each of the N regions.

[0087] For example, such as Figure 11 As shown, the container 200 may include a virtual partition region divided into four regions along its length (Y direction). Furthermore, a first combustible gas reduction unit 300A and a first gas sensor 500A may be installed in the first region; a second combustible gas reduction unit 300B and a second gas sensor 500B may be installed in the second region; a third combustible gas reduction unit 300C and a third gas sensor 500C may be installed in the third region; and a fourth combustible gas reduction unit 300D and a fourth gas sensor 500D may be installed in the fourth region.

[0088] Depending on the volume of container 200, the distance difference from ventilation unit 400, and the location of battery rack 100 including the battery cell where the incident occurred, the concentration of combustible gas in each area may vary. For example, compared to the two edge areas of container 200, the central area of ​​container 200, which is relatively far from ventilation unit 400 and prone to heat island phenomena, may have a higher frequency of combustible gas generation and accumulation rate.

[0089] According to another embodiment of the present disclosure, the energy storage system 10 can be configured such that, for example, when 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 shorter than the spark generation cycle of the first combustible gas reduction unit 300A. In this case, the combustible gas in the third region can be discharged faster than the combustible gas in the first region. As described above, by operating the combustible gas reduction unit 300 according to another embodiment of the present disclosure, the concentration of combustible gas in the first to fourth regions can be reduced more uniformly.

[0090] As described above, the energy storage system 10 with combustible gas reduction unit 300 according to this disclosure can prevent the energy storage system 10 from exploding by burning the combustible gas before the combustible gas is generated inside the container 200 and reaches the lower explosive limit concentration.

[0091] The present disclosure has been described above with reference to a limited number of embodiments and accompanying drawings. However, the present disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations can be made to it within the scope of the technical aspects of the present disclosure and the appended claims and their equivalents. Furthermore, the meaning and scope of these claims, as well as all variations and modifications derived from equivalent concepts, should be interpreted as being included within the scope of this disclosure.

[0092] Furthermore, although directional terms such as up, down, left, and right are used in this specification, it will be apparent to those skilled in the art that these terms are merely for ease of description and may vary depending on the position of the reference object or the observer.

Claims

1. An energy storage system, comprising: A battery rack, including at least one battery module; The container has an internal space for accommodating the battery rack; as well as A combustible gas reduction unit is disposed inside the container and prevents the combustible gas from accumulating in the internal space of the container by generating sparks at predetermined time intervals to burn the combustible gas.

2. The energy storage system according to claim 1, wherein The combustible gas reduction unit is configured to operate when the concentration of combustible gas inside the container reaches below the lower explosive limit.

3. The energy storage system according to claim 1, wherein The combustible gas reduction unit includes: A spark generating unit includes a spark plug and an ignition coil, the spark plug generating a spark, and the ignition coil being connected to the spark plug and configured to provide power to the spark plug; and A control unit, connected to the ignition coil and configured to control the spark generating unit to generate sparks at predetermined time intervals.

4. The energy storage system according to claim 3, wherein The combustible gas reduction unit further includes: A support component supports the spark generating unit and the control unit and is fixedly connected to one side of the container.

5. The energy storage system according to claim 4, wherein The support component includes: A panel mounting plate, wherein the control unit, implemented as a printed circuit board, is attached to the panel mounting plate; and The plug support plate is configured to be perpendicular to the panel mounting plate and has through holes in the thickness direction for the spark generating unit to pass through.

6. The energy storage system according to claim 5, wherein The support component also includes: A first cover plate extends from the edge of the plug support plate along the length direction of the spark plug; and The second cover plate bends and extends from one end of the first cover plate and is configured to be parallel to the plug support plate.

7. The energy storage system according to claim 6, wherein The combustible gas reduction unit is disposed 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. The energy storage system according to claim 6, wherein, The first cover has ventilation holes that allow ventilation and a mesh cover that covers the ventilation holes.

9. The energy storage system according to claim 3, wherein The control unit controls the spark generating unit to generate sparks at intervals of 8 to 10 seconds.

10. The energy storage system according to claim 3, further comprising: A gas sensor measures the concentration of combustible gas accumulated inside the container. The control unit controls the spark generating unit so that the spark generating cycle shortens as the concentration of combustible gas measured by the gas sensor approaches the lower explosive limit.

11. The energy storage system according to claim 1, further comprising: A ventilation unit is installed on at least one side wall of the container and is configured to ventilate the internal air of the container.

12. The energy storage system according to claim 3, wherein The container includes a virtual partition region, which is divided into two or more N regions along its length. In this configuration, at least one combustible gas reduction unit is provided in each of the N regions, and each combustible gas reduction unit provided in each of the N regions is configured to individually change the spark generation cycle based on the concentration of combustible gas measured in each of the N regions.

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