A battery box with a structure that ensures fire safety and allows for multi-tiered stacking

Abstract

To provide a battery box having a structure capable of discharging flammable gas and flames to the outside by using a duct structure and a backflow prevention valve. [Solution] This battery box has a structure that ensures fire safety and allows for multi-tiered stacking, and includes: a first enclosure that houses multiple battery modules inside; an explosion prevention panel that is placed on top of the first enclosure and that bursts to discharge the flammable gas to the top of the first enclosure when flammable gas is generated from inside the first enclosure and the pressure inside the first enclosure rises above a predetermined pressure; a first duct that has a lower end connected to the explosion prevention panel and an upper end connected to an exhaust port spaced a predetermined distance from the battery box and that guides the flammable gas discharged from the explosion prevention panel to the exhaust port; and a loading support that is placed on top of the first enclosure and supports a second enclosure that is stacked on top of the first enclosure.

Description

[Technical Field]

[0001] The present invention relates to a battery box having a structure that ensures fire safety and allows for multi-tiered stacking. [Background technology]

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as motor drive power sources for hybrid vehicles, electric vehicles, and the like, and as power storage batteries. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case that houses the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] Currently, battery boxes are installed at customer sites in a single-tiered configuration. Therefore, the installation density is limited by the capacity of the battery cells contained in the battery box. To increase the installation density, battery box enclosures (hereinafter referred to as enclosures) must be stacked in multiple tiers. However, with the current battery box structure, if a fire breaks out from the deflagration panel located at the top of the enclosure, there is a risk of the fire spreading to adjacent enclosures. In other words, if a structure is provided that can vent flammable gases and fires generated in the event of a fire to the outside without spreading to adjacent enclosures, the installation density can be increased by stacking battery boxes in multiple tiers.

[0004] The foregoing information disclosed in this Background of the Invention section is intended to enhance the understanding of the background of the present invention and may therefore include information that does not constitute prior art. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Korean Patent Application Publication No. 10-2019-0086853 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to provide a battery box having a structure that can exhaust flammable gas and flames to the outside using a duct structure and a backflow prevention valve in the event of a fire inside the battery box. [Means for solving the problem]

[0007] A battery box according to an embodiment of the present invention includes a first enclosure for accommodating the battery modules therein, an explosion prevention panel disposed on top of the first enclosure and configured to burst and discharge the flammable gas to an upper portion of the first enclosure when flammable gas is generated from inside the first enclosure and the pressure inside the first enclosure rises above a predetermined pressure, a first duct having a lower end connected to the explosion prevention panel and an upper end connected to an exhaust port spaced a predetermined distance from the battery box and configured to guide the flammable gas discharged from the explosion prevention panel to the exhaust port, and a loading support disposed on top of the first enclosure for supporting a second enclosure to be loaded on the first enclosure.

[0008] In one embodiment of the present invention, the first duct may be connected to a second duct connected to a blast protection panel disposed on top of the second enclosure when the second enclosure is stacked on top of the first enclosure.

[0009] In one embodiment of the present invention, the first duct may have a backflow prevention valve mounted therein.

[0010] In one embodiment of the present invention, the check valve can block the inflow of flammable gas flowing in from the second duct into the inside of the first enclosure.

[0011] In one embodiment of the present invention, the battery box may further include a fire detection sensor that detects a fire inside the first enclosure, and a communication device that transmits a fire detection signal generated by the fire detection sensor to other battery boxes.

[0012] In one embodiment of the present invention, the fire detection sensor may be either a temperature sensor or a smoke detector.

[0013] In one embodiment of the present invention, the fire detection sensor may be a pressure sensor attached to the blast pressure prevention panel.

[0014] In one embodiment of the present invention, the battery box may further include a communication device that receives a fire detection signal from another battery box including the second enclosure, indicating that a fire has occurred inside the other battery box, and a valve controller that, when the fire detection signal is received by the communication device, activates the backflow prevention valve and controls the backflow prevention valve to block the inflow of flammable gas flowing in from the second duct into the inside of the first enclosure.

[0015] An operation method for the battery box in the event of a fire according to one embodiment of the present invention includes the steps of determining whether a fire detection signal is generated by the fire detection sensor, and, if the fire detection signal is generated by the fire detection sensor, transmitting the fire detection signal to other battery boxes including the second enclosure.

[0016] In one embodiment of the present invention, when the second enclosure is stacked on top of the first enclosure, the first duct may be connected to a second duct connected to an explosion prevention panel arranged on top of the second enclosure, and may have a backflow prevention valve installed therein.

[0017] In one embodiment of the present invention, the operating method may further include the steps of checking whether the other battery box has transmitted a fire detection signal, and, when a fire detection signal is received from the other battery box, activating the backflow prevention valve to block the inflow of flammable gas flowing in from the second duct into the inside of the first enclosure.

[0018] However, the technical problems and solutions that the present invention aims to solve are not limited to those described above, and other problems and solutions not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Effects of the Invention]

[0019] According to one embodiment of the present invention, battery boxes can be stacked in multiple layers, thereby increasing the installation density per unit area.

[0020] According to one embodiment of the present invention, from the customer's perspective, there is an advantage that the installation cost per unit area and the site area are reduced, thereby reducing the initial investment cost.

[0021] According to one embodiment of the present invention, when a fire occurs in a battery box, flammable gases and flames generated can be discharged to the outside, preventing the fire from spreading to adjacent enclosures and maximizing explosion pressure and fire safety.

[0022] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description.

[0023] However, the effects obtained by the present invention are not limited to the effects described above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Brief explanation of the drawings]

[0024] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention. Therefore, the present invention should not be interpreted as being limited solely to the matters described in the drawings.

[0025] [Figure 1] FIG. 1 is a perspective view of a battery box installed in a single-tier stacking system. [Figure 2] This is a diagram showing how flames are ejected upward from the explosion pressure prevention panel of the battery box. [Figure 3] FIG. 1 is a diagram showing a state in which battery boxes according to an embodiment of the present invention are stacked in two stages. [Figure 4] 1 is a block diagram showing a configuration of a battery box according to an embodiment of the present invention; [Figure 5] 10 is a flowchart illustrating an operation method when a fire occurs in battery boxes stacked in multiple stages. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and claims should not be interpreted as being limited to their commonly used or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to best describe his or her invention. Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely some of the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and therefore various equivalents and modifications that can be substituted for them at the time of filing this application may exist.

[0027] Also, as used in this specification, "comprise" and / or "comprising" specify the presence of stated shapes, numbers, steps, operations, members, elements, and / or groups thereof, but do not exclude the presence or addition of one or more other shapes, numbers, operations, members, elements, and / or groups thereof.

[0028] In order to facilitate understanding of the present invention, the accompanying drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. In addition, the same reference numerals may be used to refer to the same components in different embodiments.

[0029] A statement that two comparison objects are "the same" means that they are "substantially the same." Therefore, being substantially the same may include deviations that are considered low in the art, for example, deviations within 5%. Furthermore, a certain parameter being uniform in a given region may mean uniformity from an average perspective.

[0030] Although terms such as "first" and "second" are used to describe various components, it is understood that these components are not limited by these terms. These terms are used to distinguish one component from another, and unless otherwise specified, the first component can also be the second component.

[0031] Throughout the specification, unless specifically stated to the contrary, each element may be singular or plural.

[0032] The placement of an arbitrary structure on the "top (or bottom)" of a component or "above (or below)" a component may mean that the arbitrary structure is placed in contact with the upper surface (or lower surface) of the component, but may also mean that other structures may be interposed between the component and the arbitrary structure placed on (or below) the component.

[0033] Additionally, when a component is described as being "on," "connected to," or "coupled to" another component, it should be understood that the components may be directly coupled or connected to each other, but may also be "coupled," "coupled," or "connected" through components.

[0034] As used herein, the term "and / or" includes any and all combinations of one or more of the associated list. Also, the use of "may also" when describing embodiments of the invention refers to "one or more embodiments of the invention." Expressions such as "one or more" and "one or more" preceding a list of elements modify the list of elements as a whole, not the individual elements of the list.

[0035] Throughout the specification, "A and / or B" means A, B, or A and B, unless otherwise specified, and "C to D" means greater than or equal to C and less than or equal to D, unless otherwise specified.

[0036] When syntax such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group of A, B, and C," or "at least one selected from A, B, and C" is used to specify a list of elements A, B, and C, the syntax can refer to any and all appropriate combinations.

[0037] The term "use" may be considered synonymous with the term "utilize." As used herein, "substantially," "about," and similar terms are used as terms of approximation, rather than terms of degree, and are intended to account for inherent variations in measured or calculated values ​​that one of ordinary skill in the art would recognize.

[0038] In this specification, terms such as "first," "second," and "third" may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, drawing layer, or cross section from another element, component, region, drawing layer, or cross section. Thus, a first element, component, region, level, or section discussed below could be named a second element, component, region, level, or section without departing from the teachings of the exemplary embodiments.

[0039] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," and "upper" may be used herein to describe the relationship of one element or feature to another, as shown in the figures. Spatially relative positions will be understood to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures were inverted, the illustrated element would be understood as "above" or "upper" of the other elements, with the other elements being "beneath" or "below." Thus, the term "below" can encompass both an up and down orientation.

[0040] The terms used herein are for the purpose of describing embodiments of the present invention and are not intended to limit the present invention.

[0041] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, the same reference numerals will be used for the same means regardless of the drawing number in order to facilitate overall understanding.

[0042] FIG. 1 is a perspective view of a battery box installed in a single-tier stacking system.

[0043] A battery box is a charging / discharging device that includes multiple battery modules. The battery box shown in Fig. 1 has a structure in which an enclosure 21 houses multiple battery modules, and a deflagration panel 31 is disposed on top of the enclosure 21.

[0044] The battery boxes shown in Figure 1 cannot be stacked in multiple layers (including two layers). This is because if an event such as a fire occurs inside the battery box, flammable gases and flames are discharged upward through the explosion prevention panel 31. When the battery boxes are stacked in multiple layers, the flames discharged through the explosion prevention panel 31 spread directly to adjacent enclosures, increasing the risk of fire spreading (see Figure 2).

[0045] 3 is a diagram showing a state in which battery boxes according to an embodiment of the present invention are stacked in two layers. The battery boxes 10 and 10′ shown in FIG. 3 have a structure that ensures fire safety and allows for multi-layer stacking.

[0046] The battery box 10 has a duct structure capable of discharging flammable gas and flames. Specifically, the lower end of the duct 41 is connected to the explosion prevention panel 31, and the upper end is connected to an exhaust port spaced a predetermined distance from the battery box 10, and the duct 41 guides the flammable gas and flames discharged from the explosion prevention panel 31 to the exhaust port. The battery box 10' stacked on top of the battery box 10 also includes a duct 42 capable of discharging flammable gas and flames to the exhaust port, and the duct 42 of the battery box 10' can be connected to the duct 41 of the battery box 10.

[0047] In addition, a backflow prevention valve 51 may be installed inside the duct 41 of the battery box 10. The backflow prevention valve 51 is a valve that prevents gas and flames from an adjacent battery box in the event of a fire from flowing into the battery box 10 in a normal state.

[0048] For example, the backflow prevention valve 51 of the battery box 10 prevents gases or flames generated inside the battery box 10' from flowing into the enclosure 21, and the backflow prevention valve 52 of the battery box 10' prevents gases or flames generated inside the battery box 10 from flowing into the enclosure 22 (not shown) of the battery box 10'.

[0049] Meanwhile, the loading support 61 provided at the top end of the enclosure 21 of the battery box 10 is a structure for supporting the battery box 10′ loaded on top of the enclosure 21. When the battery boxes are loaded in two layers, the installation density is doubled.

[0050] Fig. 4 is a block diagram showing the configuration of a battery box according to one embodiment of the present invention. The battery box in Fig. 4 includes multiple battery modules, ensures fire safety, and has a structure that allows for multi-tiered stacking.

[0051] Referring to FIG. 4, a battery box 10 according to one embodiment of the present invention includes an enclosure 21, an explosion prevention panel 31, a duct 41, a backflow prevention valve 51, a load support 61, and a fire extinguishing receiving panel 100, which includes a fire detection sensor 110, a communication device 120, and a valve controller 130.

[0052] The battery box 10 shown in FIG. 4 is according to one embodiment, and the components of the battery box 10 according to the present invention are not limited to the embodiment shown in FIG. 4, and may be added, changed, or deleted as necessary.

[0053] The enclosure 21 accommodates a plurality of battery modules therein.

[0054] The deflagration panel 31 is disposed on top of the enclosure 21, and when flammable gas is generated inside the enclosure 21 and the pressure inside the enclosure 21 rises above a predetermined pressure, the deflagration panel 31 bursts to discharge the flammable gas to the top of the enclosure 21. Specifically, when a battery event such as a fire occurs, the pressure inside the enclosure 21 rises due to the generation of flammable gas, and when the internal pressure rises above a predetermined pressure (e.g., 0.1 bar, 10% of atmospheric pressure), the deflagration panel 31, which is made of a thin film, bursts to discharge the flammable gas and flames inside the enclosure 21 to the outside.

[0055] The duct 41 has a lower end connected to the blast prevention panel 31 and an upper end connected to an exhaust port spaced a predetermined distance from the battery box 10 or the blast prevention panel 31. The duct 41 guides flammable gas or flames exhausted from the blast prevention panel 31 to the exhaust port. When the enclosure 22 (not shown) of another battery box 10′ (not shown) is placed on top of the enclosure 21, the duct 41 can be connected to a duct 42 (not shown) of the other battery box 10′. The duct 42 is connected to the blast prevention panel 32 (not shown) disposed on top of the enclosure 22.

[0056] A backflow prevention valve 51 may be installed inside the duct 41. The backflow prevention valve 51 functions to block the inflow of flammable gas from the duct 42 of another battery box 10′ into the enclosure 21.

[0057] The loading support 61 is a structure that is disposed on top of the enclosure 21 and that supports the enclosure 22 of the battery box 10 ′ that is loaded on top of the enclosure 21 .

[0058] The fire detection sensor 110 generates a fire detection signal when it detects a fire inside the enclosure 21. The fire detection sensor 110 can be a temperature sensor, a gas detector, a smoke detector, or the like.

[0059] Furthermore, the fire detection sensor 110 may be a pressure sensor attached to the blast pressure prevention panel 31. Specifically, there is no change in pressure before the blast pressure prevention panel 31 operates (bursts), but when it operates (bursts), the pressure in the vicinity of the blast pressure prevention panel 31 rises suddenly, which can be detected by the pressure sensor.

[0060] When a fire breaks out inside the battery box 10, the fire extinguishing receiving panel 100 detects the fire via the fire detection sensor 110 and transmits a fire detection signal to the other battery boxes via the communication device 120. The fire extinguishing receiving panel 100 can also receive a fire detection signal from the other battery boxes via the communication device 120 indicating that a fire has broken out inside the other battery boxes.

[0061] The communication device 120 is a device that transmits and receives signals and data to and from communication devices included in other battery boxes via wireless or wired communication.

[0062] When the communication device 120 receives a fire detection signal from the battery box 10', the valve controller 130 operates the backflow prevention valve 51 to a contact and controls the backflow prevention valve 51 to close the duct 41 so that flammable gas flowing in from the duct 42 of the battery box 10' does not flow into the inside of the enclosure 21.

[0063] That is, when the valve controller 130 receives a fire detection signal from the communication device 120 indicating that a fire has occurred inside another battery box, it sends an operation signal to the contact connected to the backflow prevention valve 51 to shut off the backflow prevention valve 51 and prevent flammable gas and flames from flowing into the enclosure 21.

[0064] Meanwhile, the fire receiving panel 100 is available in a general type and an addressable type. The fire receiving panel 100 can confirm the location of a battery box where a fire has occurred. In the case of a general type fire receiving panel 100, information that protection has been activated can be transmitted to each battery box in the event of a fire. This information can be received from the BMS included in other battery boxes and controls such as shutting off the backflow prevention valve 51 can be performed. In the case of an addressable type fire receiving panel 100, each fire receiving panel 100 has an identifier (ID). Therefore, in the event of a fire, the identifier of the fire receiving panel 100 for the corresponding battery box can be confirmed by other fire receiving panels, allowing controls such as shutting off the backflow prevention valve 51. Confirming the location of the battery box 10 where a fire has occurred and the identifier of the fire receiving panel 100 are useful for preventing the spread of the fire by controlling the shutoff of the backflow prevention valve 51 in adjacent or stacked battery boxes.

[0065] 5 is a flowchart for explaining an operation method in the event of a fire in the battery box. The operation method in FIG. 5 is performed by the battery box 10 in FIG.

[0066] As described in Figures 3 and 4, it is assumed that another battery box 10' is stacked on top of the battery box 10, the duct 41 is connected to the duct 42 of the other battery box 10', and the duct 42 is connected to the explosion prevention panel 32 arranged on top of the enclosure 22 of the other battery box 10'.

[0067] 5, an operation method for a battery box in the event of a fire according to one embodiment of the present invention is composed of steps S210 to S250. The operation method for a battery box in the event of a fire shown in FIG. 5 is according to one embodiment, and steps of the operation method for a battery box in the event of a fire according to the present invention are not limited to the embodiment shown in FIG. 5, and steps can be added, changed, or deleted as necessary.

[0068] Step S210 is a step for determining whether a fire has been detected inside the battery box 10. That is, the fire extinguishing receiving panel 100 determines whether a fire detection signal has been generated by the fire detection sensor 110. If a fire detection signal has been generated, step S220 is performed; otherwise, step S240 is performed.

[0069] Step S220 is a step of transmitting a fire detection signal to other battery boxes.

[0070] When the fire detection signal is generated by the fire detection sensor, the fire extinguishing receiving panel 100 transmits the fire detection signal to the fire extinguishing receiving panel 100 ′ of another battery box 10 ′ including the enclosure 22 .

[0071] Step S230 is a step in which the backflow prevention valve 52 inside the duct 42 connecting the other battery box 10' to the explosion pressure prevention panel 32 is operated to prevent flammable gas and flames generated in the battery box 10 from flowing into the other battery box 10'.

[0072] Step S240 is a step to check whether another battery box 10' has transmitted a fire detection signal. If the fire extinguishing receiving panel 100 receives a fire detection signal transmitted from another battery box 10', step S250 is performed; otherwise, step S210 is performed.

[0073] Step S250 is a step in which, when the fire extinguishing receiving panel 100 of the battery box 10 receives a fire detection signal from another battery box 10', the backflow prevention valve 51 is operated via the valve controller 130 to block the inflow of flammable gas from the duct 42 of the other battery box 10' into the interior of the enclosure 21.

[0074] The above-described battery box operation method in the event of a fire has been described with reference to the flowcharts presented in the drawings. For ease of explanation, the method has been shown and described as a series of blocks, but the present invention is not limited to the order of the blocks. Some blocks may occur in a different order or simultaneously with other blocks than those shown and described herein, and various other branches, flow paths, and block orders that achieve the same or similar results may be implemented. Also, not all of the blocks shown may be required to implement the method described herein.

[0075] Meanwhile, in the description with reference to FIG. 5, each step may be further divided into additional steps or combined into fewer steps depending on the embodiment of the present invention. Also, some steps may be omitted as necessary, and the order of steps may be changed. Note that even if other omitted content is present, the content of FIGS. 1 to 4 can be applied to the content of FIG. 5. Also, the content of FIG. 5 can be applied to the content of FIGS. 3 to 4.

[0076] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that various modifications and variations can be made by a person having ordinary skill in the art to which the present invention pertains within the technical spirit of the present invention and the equivalent scope of the claims set forth below. [Explanation of symbols]

[0077] 10, 10': Battery box 21, 22: Enclosure 31, 32: Explosion prevention panels 41, 42: Duct 51, 52: Backflow prevention valve 61: Multi-stage loading support stand 100: Fire extinguishing receiving panel 110: Fire detection sensor 120:Communication equipment 130: Valve controller

Claims

1. A battery box including a plurality of battery modules, a first enclosure that houses the plurality of battery modules therein; an explosion pressure prevention panel disposed on an upper portion of the first enclosure, the explosion pressure prevention panel bursting to discharge the flammable gas to the upper portion of the first enclosure when flammable gas is generated from inside the first enclosure and the pressure inside the first enclosure rises to or exceeds a predetermined pressure; a first duct having a lower end connected to the explosion pressure prevention panel and an upper end connected to an exhaust port spaced a predetermined distance from the battery box, for guiding the flammable gas exhausted from the explosion pressure prevention panel to the exhaust port; a battery box including a loading support disposed on top of the first enclosure for supporting a second enclosure loaded on the first enclosure;

2. The first duct is 2. The battery box according to claim 1, wherein when the second enclosure is stacked on the first enclosure, a second duct is connected to an explosion prevention panel disposed on an upper portion of the second enclosure.

3. The first duct is 3. The battery box according to claim 2, further comprising a backflow prevention valve mounted therein.

4. The backflow prevention valve is 4. The battery box according to claim 3, wherein the inflow of flammable gas flowing from the second duct into the inside of the first enclosure is blocked.

5. a fire detection sensor that detects a fire inside the first enclosure; The battery box according to claim 1 , further comprising a communication device that transmits a fire detection signal generated by the fire detection sensor to another battery box.

6. The fire detection sensor includes:

6. The battery box according to claim 5, wherein the battery box is one of a temperature sensor and a smoke detector.

7. The fire detection sensor includes:

6. The battery box according to claim 5, wherein a pressure sensor is attached to the explosion pressure prevention panel.

8. a communication device that receives a fire detection signal from another battery box including the second enclosure, the fire detection signal indicating that a fire has occurred inside the other battery box; 5. The battery box according to claim 4, further comprising: a valve controller that, when the fire detection signal is received by the communication device, activates the check valve and controls the check valve to block the inflow of flammable gas flowing in from the second duct into the first enclosure.

9. a first enclosure accommodating a plurality of battery modules therein; an explosion prevention panel disposed on top of the first enclosure, the panel bursting to discharge the flammable gas to an upper portion of the first enclosure when flammable gas is generated from inside the first enclosure and pressure inside the first enclosure rises to or exceeds a predetermined pressure; a first duct having a lower end connected to the explosion prevention panel and an upper end connected to an exhaust port spaced a predetermined distance from the explosion prevention panel, the first duct guiding the flammable gas discharged from the explosion prevention panel to the exhaust port; a loading support disposed on top of the first enclosure for supporting a second enclosure to be loaded on the first enclosure; and a fire detection sensor for detecting a fire inside the first enclosure, determining whether a fire detection signal is generated by the fire detection sensor; When the fire detection signal is generated by the fire detection sensor, transmitting the fire detection signal to another battery box including the second enclosure.

10. The first duct is When the second enclosure is stacked on the first enclosure, the second enclosure is connected to a second duct connected to an explosion prevention panel arranged on the top of the second enclosure, and has a backflow prevention valve installed therein; checking whether the other battery box has transmitted a fire detection signal; 10. The method for operating a battery box in the event of a fire according to claim 9, further comprising: when a fire detection signal is received from the other battery box, activating the backflow prevention valve to block the flammable gas flowing in from the second duct from flowing into the first enclosure.

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