Power Storage Device

Abstract

A power storage device according to one embodiment of the present invention includes at least one battery rack and an explosion-proof housing that sealably houses the at least one battery rack, so as to improve safety of the battery rack against fire and explosion.

Description

[Technical field]

[0001] The present invention relates to a power storage device.

[0002] This application claims priority to Korean Patent Application No. 10-2021-0039191, filed on March 25, 2021, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings. [Background technology]

[0003] Secondary batteries, which have high applicability for each product group and electrical properties such as high energy density, are universally used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) that are driven by electrical sources. These secondary batteries are attracting attention as a new energy source for improving energy efficiency, not only for their primary advantage of dramatically reducing the use of fossil fuels, but also for their environmental friendliness in that they do not produce any by-products from the use of energy.

[0004] Currently, secondary batteries such as lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydrogen batteries, and nickel zinc batteries are widely used. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Also, a battery pack may be configured by connecting a plurality of battery cells in parallel according to a charge / discharge capacity required for the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set according to a required output voltage or charge / discharge capacity.

[0005] Meanwhile, when a battery pack is constructed by connecting a plurality of battery cells in series / parallel, a battery module including at least one battery cell is generally constructed first, and other components are added to the at least one battery module to construct a battery pack or a battery rack. Meanwhile, a power storage device is constructed by using at least one such battery rack as an energy source.

[0006] A conventional power storage device generally includes a plurality of battery racks, each of which includes a plurality of battery modules stacked on top of one another and each of which includes at least one battery cell, and a rack case housing the plurality of battery cells.

[0007] In such conventional power storage devices, there is a risk of fire or even explosion of the battery rack due to defects in the battery cells or the system. Furthermore, if a fire or explosion occurs, it may lead to greater secondary damage.

[0008] Therefore, there is a need for a solution to provide a power storage device that can improve the safety of the battery rack against fire and explosion. Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, an object of the present invention is to provide a power storage device that can improve the safety of a battery rack against fire and explosion. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides a power storage device, including at least one battery rack, and an explosion-proof housing that sealably accommodates the at least one battery rack.

[0011] The explosion-proof housing may include a steel plate material having a predetermined thickness.

[0012] The explosion-proof housing may include a buttom cover covering a bottom of the at least one battery rack, a pair of side covers coupled to the buttom cover and covering both sides of the at least one battery rack, a door unit coupled to the pair of side covers and provided in an openable and closable manner in front of the at least one battery rack, a rear cover provided behind the door unit and covering the rear of the at least one battery rack, and a top cover provided above the rear cover and the door unit and covering an upper portion of the at least one battery rack.

[0013] The explosion-proof housing may include a base plate that supports a bottom of the buttock cover.

[0014] The upper surface of the base plate may be provided with at least one reinforcing rib for reinforcing the strength of the base plate.

[0015] The pair of side covers may include a first side cover covering one side of the at least one battery rack, and a second side cover disposed opposite the first side cover and covering the other side of the at least one battery rack.

[0016] The first side cover and the second side cover may each include a plurality of side panels stacked on top of one another.

[0017] The first side cover and the second side cover may include a thermal insulation panel disposed facing a side of the at least one battery rack.

[0018] The insulation panel may include superwool.

[0019] The door unit may be pivotally hinged to the pair of side covers.

[0020] The door units may be provided in pairs and connected to the respective side covers.

[0021] The rear cover may include at least one rear panel arranged facing the rear of the at least one battery rack, and an air conditioning unit provided on the at least one rear panel for controlling the amount of heat generated by the at least one battery rack.

[0022] When an abnormal situation occurs in the at least one battery rack, the air conditioning unit may detect heat or smoke generated in the at least one battery rack and suspend operation of the at least one battery rack.

[0023] The explosion-proof housing may be provided between the door unit and the rear cover and may include at least one guide pole for guiding support of the at least one battery rack. Effect of the Invention

[0024] According to the various embodiments described above, a power storage device capable of improving safety against fire and explosion of a battery rack can be provided.

[0025] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention, serve to further understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters described in the drawings. [Brief description of the drawings]

[0026] [Figure 1] 1 is a diagram for explaining a power storage device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram for explaining a battery rack of the power storage device of FIG. [Diagram 3]3 is a diagram for explaining a battery module of the battery rack in FIG. 2. [Figure 4] 2 is an exploded perspective view of an explosion-proof housing of the power storage device shown in FIG. 1. [Diagram 5] 5 is a diagram for explaining a base plate of the explosion-proof housing in FIG. 4. FIG. [Figure 6] 2 is a diagram for explaining a safety ensuring mechanism through an explosion-proof housing when an abnormal situation occurs in the power storage device of FIG. 1. FIG. [Figure 7] 2 is a diagram for explaining a safety ensuring mechanism through an explosion-proof housing when an abnormal situation occurs in the power storage device of FIG. 1. FIG. [Figure 8] 2 is a graph for explaining an explosion pressure calculation related to the explosion-proof housing of the power storage device of FIG. 1. [Figure 9] 2 is a graph for explaining a calculation of an explosion pressure acting on an inner wall of the explosion-proof housing of the power storage device of FIG. 1. [Figure 10] 2 is a graph for explaining calculation of maximum displacement and maximum stress acting on an inner wall of the explosion-proof housing of the power storage device of FIG. 1. [Figure 11] 2 is a graph for explaining calculation of maximum stress according to the thickness of the explosion-proof housing of the power storage device of FIG. 1. [Figure 12] 2 is a graph for explaining calculation of maximum displacement according to the thickness of the explosion-proof housing of the power storage device of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The present invention will become clearer by describing in detail the preferred embodiment of the present invention with reference to the attached drawings. The embodiments described herein are illustrative to help understand the invention, and it should be understood that the present invention can be modified and implemented in various forms different from the embodiments described herein. In addition, in order to help understand the invention, the attached drawings may not be drawn to scale, and the dimensions of some components may be exaggerated.

[0028] FIG. 1 is a diagram for explaining a power storage device according to an embodiment of the present invention.

[0029] 1, a power storage device 1 can be used as a home or industrial energy source. Such a power storage device 1 includes a battery rack 10 and an explosion-proof housing 50.

[0030] The battery rack 10 is an energy source of the power storage device 1, and may be provided in at least one or more units. Hereinafter, the present embodiment will be described with reference to the case where the battery rack 10 is provided in multiple units.

[0031] Such a battery rack 10 will be described in more detail below.

[0032] FIG. 2 is a diagram for explaining a battery rack of the power storage device of FIG. 1, and FIG. 3 is a diagram for explaining a battery module of the battery rack of FIG.

[0033] 2 and 3, the battery rack 10 includes at least one or a plurality of battery modules 15. Hereinafter, in this embodiment, the battery rack 10 will be described only in terms of the case where a plurality of battery modules 15 are provided and stacked on each other along the height direction of the battery rack 10.

[0034] The battery modules 15 each include at least one or more battery cells 17. Hereinafter, the present embodiment will be described in detail with reference to the case where a plurality of battery cells 17 are provided and stacked so as to be electrically connected to each other.

[0035] The battery cells 17 may be lithium ion batteries. Specifically, the battery cells 17 may be secondary batteries, and may be pouch-type secondary batteries, cylindrical secondary batteries, or prismatic secondary batteries. In the following, the battery cells 17 will be described as being pouch-type secondary batteries in this embodiment.

[0036] 1, the explosion-proof housing 50 can sealably cover at least one, and in this embodiment, a plurality of battery racks 10, and can sealably accommodate at least one or a plurality of battery racks 10.

[0037] Such an explosion-proof housing 50 is provided to withstand fire and explosion pressure in the event of a dangerous situation such as a fire caused by an abnormal condition of the multiple battery racks 10, or even an explosion of the battery rack 10.

[0038] Therefore, the explosion-proof housing 50 may include a steel plate material to withstand explosion pressure, etc. Here, the predetermined thickness of the steel plate material may be designed in consideration of a safety factor of 1.2 to 2.0. Specifically, the predetermined thickness may be at least 200 mm or more in consideration of the safety factor.

[0039] In addition, the explosion-proof housing 50 may be made of a galvanized steel sheet material. In addition, the explosion-proof housing 50 may be made of an electrolytic galvanized steel sheet material.

[0040] The explosion-proof housing 50 will now be described in more detail.

[0041] FIG. 4 is an exploded perspective view of the explosion-proof housing of the power storage device shown in FIG. 1, and FIG. 5 is a view for explaining a base plate of the explosion-proof housing of FIG.

[0042] 1, 4 and 5, the explosion-proof housing 50 may include a buttock cover 100, side covers 200, 300, door units 400, 500, a rear cover 600, and a top cover 700.

[0043] The buttock cover 100 may cover the bottom of at least one, or in this embodiment, a plurality of battery racks 10. The buttock cover 100 may have a size sufficient to cover the bottom of a plurality of battery racks 10 and may include the steel plate material. Furthermore, the buttock cover 100 may include a galvanized steel plate or an electro-galvanized steel plate material.

[0044] The side covers 200 and 300 are provided in a pair and are coupled to the buttock cover 100, and can cover both sides of at least one, or in this embodiment, a plurality of battery racks 10.

[0045] Such side covers 200 , 300 may include a first side cover 200 and a second side cover 300 .

[0046] The first side cover 200 may cover at least one side of a plurality of battery racks 10 in this embodiment.

[0047] Such a first side cover 200 may include side panels 210 , 220 , 230 and an insulating panel 250 .

[0048] The side panels 210, 220, 230 may be provided in a plurality and may include the steel plate material. Furthermore, the plurality of side panels 210, 220, 230 may include a galvanized steel plate or an electro-galvanized steel plate material. The plurality of side panels 210, 220, 230 may be connected to each other so as to be stacked on the sides of the explosion-proof housing 50.

[0049] In this embodiment, at least one of the insulation panels 250 may be disposed facing one side of the plurality of battery racks 10. Specifically, the insulation panel 250 may be disposed between one side of the plurality of battery racks 10 and the side panel 230.

[0050] The insulation panel 250 is for preventing heat transfer and includes a heat insulating material of a predetermined thickness, which may include glass wool or superwool. Hereinafter, in this embodiment, the insulation panel 250 will be described as including at least 100 mm of superwool.

[0051] The second side cover 300 is disposed opposite the first side cover 200 and may cover the other side of at least one, or in this embodiment, a plurality of, battery racks 10.

[0052] Such a second side cover 300 may include side panels 310 , 320 , 330 and an insulating panel 350 .

[0053] The side panels 310, 320, 330 may be provided in a plurality and may include the steel plate material. Furthermore, the plurality of side panels 310, 320, 330 may include a galvanized steel plate or an electro-galvanized steel plate material. The plurality of side panels 310, 320, 330 may be connected to each other so as to be stacked on the sides of the explosion-proof housing 50.

[0054] In this embodiment, at least one of the insulation panels 350 may be disposed facing the other side of the plurality of battery racks 10. Specifically, the insulation panel 350 may be disposed between the other side of the plurality of battery racks 10 and the side panel 330.

[0055] The insulation panel 350 is for preventing heat transfer and includes a heat insulating material of a predetermined thickness, which may include glass wool or superwool. Hereinafter, in this embodiment, the insulation panel 350 will be described as including at least 100 mm of superwool.

[0056] The door units 400, 500 are combined with the pair of side covers 200, 300 and may be provided to be openable and closable in front of at least one, in this embodiment, a plurality of battery racks 10. By opening and closing the door units 400, 500, the work efficiency of workers, etc., can be further improved when managing or inspecting at least one battery rack 10.

[0057] The door units 400, 500 may be pivotally hinged to the pair of side covers 200, 300. The door units 400, 500 may be provided in pairs and connected to the side covers 200, 300, respectively.

[0058] The pair of door units 400 , 500 may include a first door 400 and a second door 500 .

[0059] The first door 400 may be rotatably hinged to the first side cover 200. The first door 400 may be provided with a locking unit that is locked or unlocked by a user operation or automatic control when the door 400 is closed.

[0060] The first door 400 may be made of a steel sheet material, or may be made of a galvanized steel sheet material or an electro-galvanized steel sheet material.

[0061] The second door 500 may be pivotally hinged to the second side cover 300. The second door 500 may be sealably coupled to the first door 400 when the door units 400, 500 are closed. The second door 500 may be provided with a locking unit that is locked or unlocked by a user operation or automatic control when the door 500 is opened.

[0062] The second door 500 may be made of a steel sheet material, or may be made of a galvanized steel sheet material or an electro-galvanized steel sheet material.

[0063] The rear cover 600 is provided behind the door units 400 and 500, and can cover the rear of at least one, or in this embodiment, a plurality of battery racks 10.

[0064] Such a rear cover 600 may include rear panels 610 , 620 and an air conditioning unit 650 .

[0065] At least one of the rear panels 610, 620 may be disposed facing the rear of a plurality of battery racks 10 in this embodiment. A plurality of such rear panels 610, 620 may be provided and disposed so as to be stacked on top of each other along the front-rear direction of the explosion-proof housing 50.

[0066] The rear panels 610, 620 may include a steel sheet material, or may include a galvanized steel sheet material or an electro-galvanized steel sheet material.

[0067] The air conditioning unit 650 is for controlling the amount of heat generated by at least one, in this embodiment, a plurality of battery racks 10, and may be provided in the at least one rear panel 610, 620.

[0068] When an abnormal situation occurs in at least one battery rack 10, the air conditioning unit 650 can detect heat or smoke generated in the at least one battery rack 10 and halt the operation of the at least one battery rack 10.

[0069] The top cover 700 is provided on the upper side of the rear cover 600 and the door units 400 and 500, and may cover the upper part of at least one, in this embodiment, a plurality of battery racks 10. The top cover 700 may be provided with at least one gas exhaust port 750 (see FIG. 7) for exhausting internal gases, etc.

[0070] The top cover 700 may be made of a steel sheet material, or may be made of a galvanized steel sheet material or an electro-galvanized steel sheet material.

[0071] The top cover 700 may be connected to the side covers 200, 300 and the rear cover 600. Here, the top cover 700 is flanged jointed to the side covers 200, 300 and the rear cover 600, and at least one gas exhaust port 750 may be further formed on the upper side of the top cover 700 during the flanged joint.

[0072] The flange connection may also be applied when the buttock cover 100 is connected to the side covers 200, 300 and the rear cover 600. In this case, the gas exhaust port may also be provided on the buttock cover 100 side. In the present embodiment, by forming the gas exhaust port through the flange connection, a flame passage is formed, and in the event of a fire or explosion of the battery rack 10 in the explosion-proof housing 50, the high-temperature and high-pressure gas G (see FIG. 7) inside the explosion-proof housing 50 can be discharged to the outside of the explosion-proof housing 50, thereby effectively reducing the internal pressure of the explosion-proof housing 50.

[0073] The explosion-proof housing 50 may further include a base plate 800 .

[0074] The base plate 800 may support the bottom of the buttock cover 100 .

[0075] Such a base plate 800 may be provided with a conveying guider 820 and a reinforcing rib 850 .

[0076] The transportation guider 820 is provided on at least one side of the base plate 800 and can guide the transportation of the base plate 800 as well as the transportation of the entire explosion-proof housing 50 and the power storage device 1.

[0077] The reinforcing rib 850 is for reinforcing the strength of the base plate 800 and may be provided on the upper surface of the base plate 800. At least one or more reinforcing ribs 850 may be provided. Hereinafter, the present embodiment will be described with reference to the case where a plurality of reinforcing ribs 850 are provided.

[0078] The explosion-proof housing 50 may further include a guide pole 900 .

[0079] The guide pole 900 may be provided in a plurality of pieces, such as at least one. Hereinafter, the present embodiment will be described with reference to the case where the guide pole 900 is provided in a plurality of pieces.

[0080] The plurality of guide poles 900 may be provided between the door units 400, 500 and the rear cover 600 to guide the support of at least one battery rack 10. The plurality of guide poles 900 may be disposed at predetermined distances from each other in the front-rear direction of the explosion-proof housing 50.

[0081] Meanwhile, the explosion-proof housing 50 may further include a sealing gasket 950 .

[0082] The sealing gasket 950 is disposed at the rear of the door units 400, 500, and can further increase the sealing force of the peripheral areas of the door units 400, 500 when the door units 400, 500 are closed.

[0083] Hereinafter, a mechanism for ensuring safety through the explosion-proof housing 50 when an abnormal situation occurs in the power storage device 1 according to the present embodiment will be described in more detail.

[0084] 6 and 7 are diagrams for explaining a safety assurance mechanism through an explosion-proof housing when an abnormal situation occurs in the power storage device of FIG.

[0085] 6 and 7, an abnormal situation may occur due to overheating of at least one of the battery racks 10 of the power storage device 1. At this time, depending on the degree of overheating, a fire or even an explosion of the battery rack 10 may occur.

[0086] In this embodiment, the explosion-proof housing 50, which includes a steel plate material, is structured to seal a plurality of battery racks 10, so that in the event of a fire or explosion, the explosion-proof housing 50 can withstand the explosion pressure of the battery racks 10 and prevent the risk of additional chain explosions outside the explosion-proof housing 50.

[0087] At this time, since the high-temperature and high-pressure gas G can be effectively discharged from the gas exhaust port 750 of the explosion-proof housing 50, the internal pressure of the explosion-proof housing 50 can be further reduced, thereby slowing down the expansion speed of the explosive gas and sufficiently lowering the internal temperature, thereby more effectively preventing the risk of an additional secondary explosion.

[0088] FIG. 8 is a graph for explaining an explosion pressure calculation associated with the explosion-proof housing of the power storage device of FIG.

[0089] Referring to Figure 8, first, the simulation conditions for calculating the explosion pressure are as follows: As the analysis method, a transient analysis was used, and a linear elasticity model with high accuracy in the elastic region was applied.

[0090] In addition, the Rayleigh damping model was applied. Specifically, when vibration occurs due to the impact of an explosion, a damping coefficient based on the mass and rigidity of the explosion-proof housing was applied. This is defined by the following Equation 1.

[0091] [Formula 1] C=αM+βK (α: Mass damping coefficient, β: Rigidity damping coefficient) In Equation 1, C may represent a damping coefficient, M may represent mass, and K may represent stiffness.

[0092] In the simulation, a mesh with a cell size of approximately 0.0075 m and a cell count of 5,557,725 EA was applied.

[0093] Finally, the physical properties of the explosion-proof housing applied in the simulation are as follows:

[0094] [Table 1] The explosion pressure calculation theory will be explained below.

[0095] Explosion loads occur in a positive pressure stage where the pressure is higher than atmospheric pressure, and a negative pressure stage where the pressure is lower than atmospheric pressure. When the shock wave arrives, the positive pressure increases instantaneously and then decreases rapidly. Next, negative pressure continues until the pressure becomes the same as the surrounding atmospheric pressure. However, in explosion analysis, the effect of the negative pressure stage is generally negligible, so only the positive pressure stage is considered. Furthermore, the greater the amount of hydrogen or the smaller the pressure vessel, the greater the pressure that acts.

[0096] The explosion load can be calculated by considering FIG. 8 and the following formula:

[0097] The explosion load is calculated using scaled distance as the key variable.

[0098] [Formula 2]

number

[0099] The pressure of the explosion load is calculated as the sum of the incident pressure and the reflected pressure, and the maximum positive pressure taking into account the incident angle is as follows:

[0100] [Formula 3]

number

[0101] The total impact of the blast load may also be calculated in a similar manner as the maximum positive pressure.

[0102] [Formula 4]

number

[0103] Finally, the positive pressure duration T0 is:

[0104] [Formula 5]

number

[0105] Taking the above into consideration, the final explosion load calculation formula is as follows:

[0106] [Formula 6]

number

[0107] FIG. 9 is a graph for explaining a calculation of an explosion pressure acting on the inner wall of the explosion-proof housing of the power storage device of FIG.

[0108] Referring to FIG. 9, the conditions for calculating the explosion pressure are as follows: the shortest distance from the explosive to the target is 0.84 m, the amount of explosive is 0.59 kg, and the incidence angle of the explosion pressure on the wall is assumed to be 0 degrees, which is perpendicular to the surface. Furthermore, the time step is as follows:

[0109] [Formula 7] T a ≦ Time ≦ T a + T0: 0.005ms Time > T a + T0: 0.1ms

[0110] As a result of the explosion pressure calculation, the maximum explosion pressure acting on the wall was 5.01 MPa, and the time to reach positive pressure was T a is 0.45 ms, and the positive pressure duration T0 is 0.19 ms.

[0111] FIG. 10 is a graph for explaining calculation of maximum displacement and maximum stress acting on the inner wall of the explosion-proof housing of the power storage device of FIG.

[0112] Referring to Figure 10, first, the steel plate thickness of the explosion-proof housing in the test is 1.6mm. An impulse-type explosion pressure occurs at positive pressure duration T0, and the maximum displacement is 183mm due to the explosion pressure, and then the displacement decreases due to damping vibration and converges to 0mm. It can be seen that the maximum stress is 12.0GPa, which is 69 times the yield stress (175MPa). Furthermore, the greatest displacement and stress occurs near the door of the explosion-proof housing at the time of maximum displacement (6.3ms).

[0113] Figures 11 and 12 are graphs for explaining calculations of maximum stress and maximum displacement according to the thickness of the explosion-proof housing of the power storage device of Figure 1. Specifically, Figures 11 and 12 show test results for maximum stress and maximum displacement according to various thicknesses of the steel plate constituting the explosion-proof housing.

[0114] 11 and 12, first, tests were conducted on steel sheets of various thicknesses. In the tests, electro-galvanized steel sheets (SECC) were used as the steel sheets, and the thicknesses of the steel sheets were changed to 1.6 mm, 10 mm, 20 mm, 30 mm, 40 mm, 100 mm, and 200 mm.

[0115] The test results show that the thicker the steel plate, the smaller the maximum displacement and maximum stress of the explosion-proof housing. Also, the minimum thickness of the SECC material for which the maximum stress does not exceed the yield stress (0.175GPa) is 109mm, and the maximum displacement when the minimum thickness is applied is 0.5mm.

[0116] Meanwhile, it is desirable to apply a safety factor to the selection of the final thickness. As mentioned above, the safety factor is a value determined by the designer before the design as a safety requirement of the structure, and for mechanical parts, a value of 1.2 to 2.0 is usually used. If a safety factor of 2.0 is applied to ensure safety more reliably, the final thickness of the steel plate may be 218 mm, which is 109 mm multiplied by the safety factor of 2.0.

[0117] In this way, through the above simulation, it can be confirmed that when a steel plate of about 200 mm or more is applied to the explosion-proof housing, the explosion-proof design of the explosion-proof housing of the power storage device can be made to be pressurized and explosion-proof. Therefore, in this embodiment, when a steel plate of about 200 mm or more is applied to the explosion-proof housing, the explosion-proof performance of the explosion-proof housing can be significantly improved.

[0118] According to the various embodiments as described above, it is possible to provide a power storage device 1 that can improve the safety of the battery rack 10 against fire and explosion.

[0119] Although a preferred embodiment of the present invention has been illustrated and described above, the present invention is not limited to the above-mentioned specific embodiment, and various modifications may be made by a person having ordinary skill in the art to which the invention pertains without departing from the gist of the present invention as claimed in the claims, and such modifications should not be understood individually from the technical ideas and prospects of the present invention. [Explanation of symbols]

[0120] 1. Power storage device 10 Battery Rack 15 Battery Module 17 Battery Cells 50 Explosion-proof housing 100 Batom Cover 200 1st side cover 210 Side Panel 220 Side Panel 230 Side Panel 250 Insulation Panel 300 2nd side cover 310 Side Panel 320 Side Panel 330 Side Panel 350 Insulation Panel 400 1st Door 500 2nd Door 600 Rear cover 610 Rear Panel 620 Rear Panel 650 Air Conditioning Unit 700 Top Cover 750 Gas outlet 800 Baseplate 820 Transportation Guide 850 Reinforcement rib 900 Guide Pole 950 Sealing Gasket

Claims

1. In the power storage device, At least one battery rack; an explosion-proof housing that accommodates the at least one battery rack therein and can withstand an explosion of the battery rack; Including, The explosion-proof housing is made of a steel plate material having a thickness of 200 mm or more, Furthermore, the explosion-proof housing is a bottom cover covering a bottom of the at least one battery rack; a pair of side covers coupled to the buttock cover and covering both sides of the at least one battery rack; a door unit coupled to the pair of side covers and provided in a manner capable of being opened and closed in front of the at least one battery rack; a rear cover provided at a rear of the door unit and covering a rear of the at least one battery rack; a top cover provided on an upper side of the rear cover and the door unit and covering an upper portion of the at least one battery rack; At least one guide pole provided between the door unit and the rear cover for guiding the support of the at least one battery rack; A power storage device comprising:

2. The explosion-proof housing includes: The power storage device of claim 1 , further comprising a base plate supporting a bottom of the buttock cover.

3. The upper surface of the base plate is The power storage device according to claim 2 , further comprising at least one reinforcing rib for reinforcing the strength of the base plate.

4. The pair of side covers include a first side cover covering one side of the at least one battery rack; The power storage device according to any one of claims 1 to 3, further comprising: a second side cover arranged opposite the first side cover and covering the other side of the at least one battery rack.

5. The first side cover and the second side cover each include The power storage device of claim 4 , comprising a plurality of side panels stacked on top of one another.

6. The first side cover and the second side cover are The power storage device according to claim 4 or 5, further comprising an insulating panel arranged facing a side surface of the at least one battery rack.

7. The insulating panel comprises: The power storage device of claim 6 , comprising glass wool.

8. The door unit includes: The power storage device according to any one of claims 1 to 7, wherein the power storage device is rotatably hinged to the pair of side covers.

9. The door unit includes: The power storage device according to any one of claims 1 to 8, wherein the power storage device is provided in a pair and is connected to each of the side covers.

10. The rear cover is at least one rear panel disposed facing the rear of the at least one battery rack; The power storage device according to any one of claims 1 to 9, further comprising: an air conditioning unit provided in the at least one rear panel for controlling the amount of heat generated by the at least one battery rack.

11. The air conditioning unit comprises: The power storage device according to claim 10, wherein when an abnormal situation occurs in the at least one battery rack, heat or smoke generated in the at least one battery rack is detected and operation of the at least one battery rack is interrupted.

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