Housing stacking type energy storage system

The present disclosure is a housing stacking energy storage system. In the present disclosure, a first housing 10 and a second housing 20 having a predetermined size are stacked, and a rack 30 is installed in a first inner space 11 of the first housing 10 and a second inner space 21 of the second housing 20 to mount a plurality of battery packs 32. The first inner space 11 and the second inner space 21 communicate with each other to form one space, and a control unit 46, a fire extinguishing system 47 and a spray system 48 are installed therein. According to the present disclosure, it is possible to firmly install the energy storage system having a relatively large capacity in a specific installation area.

TECHNICAL FIELD

The present disclosure relates to an energy storage system, and more particularly, to a housing stacking type energy storage system in which housings are stacked and inner spaces of the stacked housings are formed into a single space in communication with each other.

BACKGROUND ART

An energy storage system, abbreviated as ESS, stores electric energy in an internal battery pack so that the electric energy may be used when needed. Such an energy storage system is installed not only indoors but also outdoors and is widely used.

Energy storage system is generally made in various container sizes such as 20 ft and 40 ft, making it easy to move to an installation location. Prior arts 1 and 2 disclose container-type energy storage systems.

However, as in the prior arts, energy storage systems made of a certain standard container size cannot be simply stacked, so they are installed one by one in a single layer at the installation site. Therefore, when multiple energy storage systems are used, a large installation area is required to ensure a legally required distance between the storage systems.

In order to solve these problems, in some cases, two separate energy storage systems are stacked and used. However, in this case, the two energy storage systems are not directly stacked, but there is a certain space between the energy storage systems stacked up and down. If two energy storage systems are stacked directly, there is a problem in that an explosion or deflagration discharged from a deflagration outlet, usually installed on an upper plate of the lower energy storage system, is transmitted to the upper energy storage system and therefore cannot be actually used.

Therefore, in the prior art, when stacking two energy storage systems, a separate support structure is made for the installation of the energy storage systems, and the energy storage systems are placed on the upper part and lower part of the structure, respectively. In such a structure, the height of the energy storage system stacked on the second floor becomes relatively high from the ground, and there is a vulnerability to earthquake and wind load for the energy storage system on the second floor. In addition, the cost for manufacturing the structure is added.

As the prior art of such an energy storage system, there are Korean Patent Application Publication No. 10-2020-0088553 and Korean Patent Application Publication No. 10-2022-0135123.

DISCLOSURE

Technical Problem

An objective of the present disclosure is to provide an energy storage system with a large capacity while using a relatively small area.

An objective of the present disclosure is to separately manufacture an energy storage system into a first housing and a second housing, and stack the first housing and the second housing.

An objective of the present disclosure is to manufacture an energy storage system separately into a first housing and a second housing, and to install components by making the inside of the first housing and the second housing into a single space.

An objective of the present disclosure is to manufacture an energy storage system by stacking a first housing and a second housing having a size that may be transported using standardized means of transportation.

An objective of the present disclosure is to configure the exterior of an energy storage system by directly stacking housings having a size that may be transported using standardized means of transportation.

An objective of the present disclosure is to prevent sagging of an upper housing by using a lower housing in an energy storage system manufactured by stacking housings.

An objective of the present disclosure is to facilitate the flow of a fluid for heat dissipation in the inner space of an energy storage system manufactured by stacking housings.

An objective of the present disclosure is to allow abnormal pressure generated inside an energy storage system manufactured by stacking housings to be discharged to the outside without damaging the housing.

Technical Solution

According to the characteristics to achieve the above objectives, the present disclosure may provide an energy storage system having a high capacity compared to an area by stacking a first housing and a second housing having a predetermined size.

The housing stacking energy storage system of the present disclosure includes: a first housing having a first inner space therein; a second housing mounted and stacked on the first housing and having a second inner space therein; a plurality of battery packs mounted on racks installed in the first inner space and the second inner space; and a control unit controlling charging and discharging of the battery pack.

The first inner space and the second inner space communicate with each other, and a plurality of racks installed in the first inner space and the second inner space may be arranged in a row.

The first housing may include a first housing frame that forms its skeleton and a first door unit that allows access to the first inner space. The second housing may include a second housing frame that forms its skeleton and a second door unit that allows access to the second inner space.

An anti-sag bracket may be provided to connect a vertical member of the first housing frame and a vertical member of the second housing frame.

The anti-sag bracket may include a protector body with multiple fastening holes formed at both ends, a first spacer block provided on one surface of the protector body to be in close contact with the first housing frame, and a second spacer block provided on one surface of the protector body to be in close contact with the second housing frame.

A reinforcing piece protruding and extending from the opposite surface of the first and second spacer blocks in the longitudinal direction of the protector body may be further provided.

A first fastening part having a first fastening hole is provided at corners of the first housing, and a second fastening part having a second fastening hole is provided at corners of the second housing, such that the first housing and the second housing may be fastened each other.

Components constituting the control unit may be installed inside the first and second housings. Additionally, a fire extinguishing system and a spray system may be further provided inside the first housing and the second housing.

The spray system may be installed in the second inner space of the second housing.

The upper surface of the second housing may be further provided with a pressure discharge plate that is torn open by pressure and discharges the pressure to the outside when the pressure of the first inner space and the second inner space exceeds a predetermined level.

A heat exchange unit may be further provided to supply a fluid at a predetermined temperature to the first and second housings. The fluid that has passed through the inner spaces of the first and second housings is then received by the heat exchange unit to perform heat exchange.

In the case of the heat exchange unit, a heat exchange unit connected to the first housing and a heat exchange unit connected to the second housing are provided, and these heat exchange units may be installed by stacking.

A flow forming plate and a partition plate may be provided to form a flow path, so that a fluid of a predetermined temperature supplied from the heat exchange unit flows through the space between the racks installed in the first housing and the racks installed in the second housing, and between the racks installed in the second housing and the ceiling surface of the second housing.

A plurality of racks installed in the first inner space and the second inner space are arranged in a row. The partition plate may be installed in the rack so as to selectively open and close the space between the rows of the rack.

The partition plate may include a plate-shaped partition plate body, and a hinge that rotates the partition plate body with respect to a rack when pressure formed in the inner space exceeds a predetermined level.

A first top plate may be provided along the edge of the upper surface of the first housing, and a sealing member to which the second housing is seated may be further provided on the first top plate.

A waterproof plate connecting between the first housing and the second housing seated on the sealing member may be further provided to shield the sealing member.

A waterproof fence is further provided along the front end of the first top plate to prevent moisture falling on the first top plate from being transferred to the first inner space.

The housing stacking energy storage system of the present disclosure may include: a first housing having a first inner space therein; a second housing mounted and stacked on the first housing and having a second inner space therein; a plurality of battery packs mounted on racks installed in the first inner space and the second inner space; a pressure discharge plate provided on an upper surface of the second housing, and torn open by pressure when the pressure of the first inner space and the second inner space exceed a predetermined level to discharge the pressure to the outside; a heat exchange unit supplying a fluid at a predetermined temperature to the first and second inner spaces and receiving the fluid flowing in the first and second inner spaces to perform heat exchange; and a control unit controlling charging and discharging of the battery pack.

A flow forming plate and a partition plate may be provided to form a flow path, so that a fluid of a predetermined temperature supplied from the heat exchange unit flows through the space between the racks installed in the first and second housings, and between the racks installed in the second housing and the ceiling surface of the second housing.

A plurality of racks installed in the first inner space and the second inner space are arranged in a row. The partition plate may be installed in the rack so as to selectively open and close the space between the rows of the rack.

The partition plate may include a plate-shaped partition plate body, and a hinge that rotates the partition plate body with respect to a rack when pressure formed in the inner space exceeds a predetermined level.

The partition plate may be installed at an upper end of a space between rows of racks disposed in the first inner space.

The partition plate may be installed at an upper end and a lower end of a space between rows of racks disposed in the second inner space.

Components constituting the control unit may be installed inside the first and second housings. Additionally, a fire extinguishing system and a spray system may be further provided inside the first housing and the second housing.

The spray system may be installed in the second inner space of the second housing.

In the case of the heat exchange unit, a heat exchange unit connected to the first housing and a heat exchange unit connected to the second housing are provided, and these heat exchange units may be installed by stacking.

An exhaust unit may be further provided to flow air between the inner spaces and the outside of the first housing and the second housing.

The exhaust unit may be provided in a pair of a suction side exhaust unit having a damper and a discharge side exhaust unit having a fan.

The suction side exhaust unit may be located on a lower side of the first housing and the second housing, and the discharge side exhaust unit may be located on an upper side of the first housing and the second housing.

Advantageous Effects

The housing stacking energy storage system of the present disclosure may have at least one or more of the following effects.

The energy storage system of the present disclosure may provide a relatively large capacity compared to the area for installing the energy storage system by stacking the first housing and the second housing constituting the exterior.

In the present disclosure, the first housing and the second housing constituting the exterior of the energy storage system may be separately manufactured. Therefore, it is very convenient to manufacture or transport the first housing and the second housing.

In the present disclosure, the insides of the stacked first housing and the second housing are communicated as one space. Therefore, the space formed inside the first housing and the second housing may be managed as one, and more battery cells may be installed to increase the capacity while using relatively few parts to configure the system.

In the present disclosure, since the first housing and the second housing have a standardized size that may be transported using standardized transportation means, it is convenient to transport the first housing and the second housing. In addition, most of the components including the battery packs installed inside the first housing and the second housing are transported to the installation site in a factory-assembled state and only need to be installed (structured) at the site.

In the present disclosure, housings having standardized sizes are directly stacked and the stacked housings are fastened to each other. Therefore, it is relatively easy to combine the housings, and the housing located on the upper part is stably supported so as to have a high resistance to lateral loads applied from the external environment.

In the present disclosure, the upper housing and the lower housing are connected using an anti-sag bracket that supports the sagging of the housing at the upper part to ensure that the overall structure is stable.

In the present disclosure, a flow forming plate and a partition plate are used to separate air flow for heat dissipation between rows of racks installed in the first housing and the second housing and between the rack and the inner surface of the housing. The partition plate is opened in an emergency to smoothly discharge pressure through a pressure discharge plate. Thus, in the energy storage system formed by stacking the first housing and the second housing, heat is smoothly dissipated and pressure is smoothly discharged in an emergency.

In the present disclosure, a pressure discharge plate is placed in the stacked upper housing. The pressure discharge plate is torn open when a predetermined level of pressure or more is generated inside the housing to discharge pressure to the outside. Even if an abnormal pressure is generated in the lower housing, the pressure is discharged through the pressure discharge plate through the opening of the partition plate, without damaging the housing.

BEST MODE FOR DISCLOSURE

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In assigning reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though the same components are indicated on different drawings. In addition, in describing the embodiment of the present disclosure, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present disclosure, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only used to distinguish between the components, and the nature, or order of the components are not limited by the terms. When a component is described as being “combined with”, “coupled to” or “connected to” another component, the component may be directly connected to or combined with each other, but it should be understood that another component may be “connected to”, “coupled to” or “combined with” each of the components therebetween.

In the energy storage system of the present disclosure, a first housing10and a second housing20may form an external appearance. The first housing10is placed on the ground and the second housing20is placed on the first housing10. The first housing10and the second housing20may have the same or similar shape and size as, for example, a 20 ft container.

This is to facilitate the transfer of the first housing10and the second housing20. That is, in order to transport the first housing10and the second housing20using a standardized means of transport, the first housing10and the second housing20are to have such shapes and dimensions.

The first housing10may have a front surface101, two side surfaces102, a rear surface103, and a bottom surface (no reference numerals are assigned) with reference toFIG.1. Most of an upper surface104of the first housing10may be opened. As the bottom surface of the first housing10is not opened, it may be blocked from the environment around the floor. A rack30to be described below may be installed on the bottom surface of the first housing10.

A first inner space11is formed inside the first housing10. Various components, to be described below, including a rack30and a battery pack32mounted thereon may be disposed in the first inner space11. For reference, the first inner space11communicates with a second inner space21of the second housing20to be described below. For this purpose, the upper surface104of the first housing10may be in an open state. By opening the upper surface104, the second inner space21of the second housing20and the first inner space11may communicate with each other, thereby forming one space as a whole.

The first housing10may have a rectangular parallelepiped shape. A first housing frame12may form the skeleton of the first housing10. The first housing frame12is configured such that a plurality of members are connected horizontally and vertically, and a plate or the like may be mounted thereon. In this embodiment, in describing the structure of the first housing frame12, reference numerals are assigned to only necessary members for convenience. The first housing frame12includes a horizontal member120and a vertical member121, which may be coupled together. These horizontal members120and vertical members121may form a part of the outer surface and skeleton of the first housing frame12.

As shown inFIG.6, a first top plate122may be provided around the inner side of the upper end of the first housing frame12. The first top plate122may extend horizontally from one side of the first housing frame12, more specifically, from the horizontal member120. The first top plate122is positioned along the inner edge of the upper surface104of the first housing10, and a waterproof fence124may be provided along the edge of the first top plate122. The waterproof fence124prevents moisture falling on the first top plate122from falling downwardly from the first top plate122. The waterproof fence124may be formed to be orthogonal to the first top plate122.

A plurality of connecting members125may be used to reinforce the strength of the first housing frame12in the front-rear direction, as shown inFIG.5.

The first housing frame12has a first door unit14. The first door unit14is provided on the front surface101, side surface102, and rear surface103of the first housing10to enable access to the first inner space11. The first door unit14may be configured to open and close as a pair of two. The first door unit14may include a door body140that shields an open part of the first housing frame12and a door hinge142for connecting the door body140to the first housing frame12to be opened and closed.

The door body140may have a rectangular shape in the present embodiment, but does not necessarily have to, and may have any shape capable of accessing the first inner space11for maintenance of a battery pack or the like. The door hinge142is for opening and closing the door body140. A locking bar assembly144may be provided on an outer surface of the door body140. The locking bar assembly144, in a state in which a part thereof is installed in the door body140to be lifted, has an end inserted into one side of the first housing frame12to prevent the opening of the first door unit14.

A first fastening part16is provided at the corner of the first housing10. The first fastening part16has a hexahedral shape, and has a first fastening holes16′ connected to each other so as to be open to three surfaces exposed to the outside. The first fastening part16performs a function of fixing the first housing10itself during transportation and a function of mutual fastening with the second housing20to be described below.

The second housing20may be directly mounted on the top of the first housing10. The second housing20has almost the same appearance and size as the first housing10. The second inner space21is formed inside the second housing20. The second housing20may have a front surface201, two side surfaces202, a rear surface203, and an upper surface204. The bottom of the second housing20is open. Accordingly, the first inner space11of the first housing10and the second inner space21of the second housing20communicate with each other to form a single space. That is, when the bottom of the second housing20is open and the top of the first housing10is open, and the second housing20is stacked on the first housing10, inside the first housing10and the second housing20, the first inner space11and the second inner space21may form one space.

The second housing20may have a rectangular parallelepiped shape. A second housing frame22may form the skeleton of the second housing20. The second housing frame22is configured such that a plurality of members are connected horizontally and vertically, and a plate or the like may be mounted thereon. In this embodiment, in describing the structure of the second housing frame22, reference numerals are assigned to only necessary members for convenience. The second housing frame22includes a horizontal member220and a vertical member221, which may be coupled together. These horizontal members220and vertical members221may form a part of the outer surface and skeleton of the second housing frame22. InFIG.6, a connecting member222and a horizontal connecting member224are installed orthogonally to each other at the bottom of the second housing20, and each of them may be coupled to a horizontal member220or a vertical member221constituting the second housing frame22. With this configuration, a rack30may be seated on the connecting member222and the horizontal connecting member224.

The second housing frame22has a second door unit24. The second door unit24is provided on the front surface201, side surface202, and rear surface203of the second housing20to enable access to the second inner space21. The second door unit24may be configured to open and close as a pair of two. The second door unit24may include a door body240that shields an open part of the second housing frame22and a door hinge242for connecting the door body240to the second housing frame22to be opened and closed.

The door body240may have a rectangular shape in the present embodiment, but does not necessarily have to, and may have any shape capable of accessing the second inner space21for maintenance of a battery pack or the like. The door hinge242is for opening and closing the door body240. A locking bar assembly244may be provided on an outer surface of the door body240. The locking bar assembly244is for locking the closed state of the door body240. The locking bar assembly244has the same configuration and function as the locking bar assembly144of the first door unit14.

A second fastening part26is provided at the corners of the second housing20. The second fastening part16has a hexahedral shape, and has a second fastening holes26′ connected to each other so as to be open to three surfaces exposed to the outside. The second fastening part16performs a function of fixing the second housing10itself during transportation and a function of mutual fastening with the first housing10.

A plurality of pressure discharge plates28are provided on the upper surface204of the second housing20. The pressure discharge plate28discharges an abnormal pressure to the outside when explosion or deflagration occurs in the inner spaces11and21of the first housing10and the second housing20. The configuration of the pressure discharge plate28is to discharge the pressure to the outside while being torn open when the pressure in the inner spaces11and21reaches a predetermined value or more. In this way, the pressure may be discharged to the outside through the pressure discharge plate28without damaging other components of the first housing10and the second housing20.

A plurality of racks30are installed in the first inner space11of the first housing10and the second inner space21of the second housing20. The racks30in the first inner space11are supported by the first housing frame12of the first housing10, and the racks30in the second inner space21are supported by the second housing frame22. In this way, the first housing10and the second housing20may be transferred while the rack30and the battery pack32are mounted thereon.

A plurality of battery packs32may be installed on the rack30. The battery packs32are installed on the rack30with their front surfaces facing the door units14and24. Accordingly, the rear surface of the battery pack32is positioned toward the space30′ (seeFIG.8) defined between the two rows of the rack30. The level of the output voltage may be adjusted according to the number of the battery packs32connected in series.

InFIG.7, for example, the rack30disposed in the first inner space11or the second inner space21and a configuration related thereto are illustrated. As may be seen here, the racks30are arranged in a front line and a rear line based on the drawing. A flow path through which air may flow is formed through the space30′ between the rows of the racks30. Separate flow forming plates34are installed for this purpose.

As seen inFIG.7, a flow forming plate34ais provided to block the side in the space30′ between the front row and the rear row of the rack30. For example, flow forming plates34b,34cmay be installed in the part of the first housing frame12where the door hinge142of the first door unit14is mounted. More specifically, there are flow forming plates34b,34cthat block a space where the rack30may not be installed because it is an area corresponding to the back of the vertical member121. In addition, flow forming plates34d,34ethat form a flow path between the rack30and a heat exchange unit40to be described below are connected to the rack30. The flow forming plate not shown in the drawings is not assigned a reference numeral. By the use of the flow forming plate, a path through which relatively low temperature air flows and a path through which high temperature air flows may be separated, thereby efficiently dissipating heat generated from the battery pack32.

Meanwhile, a partition plate36may be provided to block the upper part of the space30′ (seeFIG.8) between the rows of the rack30. The partition plate36forms a flow path in cooperation with the flow forming plate34. There are other positions in which the partition plate36and the flow forming plate34are installed.

The partition plate36may be positioned along the portion indicated by the dotted line36′ inFIG.9. That is, the separator plate36may be positioned at the top between the rows of racks30installed in the first housing10and at the top and bottom between the rows of racks30installed in the second housing10, respectively. Of course, the flow forming plates34together with the partition plate36are also located at corresponding positions. In this way, the flow path may be divided as shown inFIG.9by the partition plate36and the flow forming plate34. That is, the low-temperature region where relatively low-temperature air flows, indicated by arrow A, is located in the upper part of the first housing10and the second housing20.

Then, there is a high-temperature region where high-temperature air due to heat generated by the battery cell32flows in the direction indicated by arrow B. The high-temperature region corresponds to a region where the battery cell32is located.

As such, the upper regions of the first housing10and the second housing20may be regions where relatively low temperature air may flow by the flow forming plate34and the partition plate36. Accordingly, the air flow in the inner spaces11and21is constantly maintained so that heat may be uniformly removed from the region where the battery cells32are located and then transferred to the heat exchange unit40.

Meanwhile, the partition plate36may be open by a predetermined pressure or more. For this purpose, the partition plate36is configured such that a plate-shaped partition plate body37may be open at a predetermined angle by a hinge37′. When the pressure in the space30′ is greater than or equal to a predetermined level, the partition plate36is open by the pressure so that the pressure may be discharged. The two partition plates36are configured to form a pair, open in a direction away from each other, and close in a direction close to each other. A semicircular through-hole is formed at a front end of the partition plate body37, respectively, and both sides are combined to form a circular hose through hole38. The hose through hole38is a portion through which a hose of a spray system48, to be described below, passes.

As described above, the partition plate36may be located in a plurality of places. The partition plate36normally functions to divide a space to form a flow path, but is opened in an emergency so that pressure may be transferred toward the pressure discharge plate28.

There may be a heat exchange unit40for supplying air or water at a predetermined temperature to the first housing10and the second housing20. The first housing10and the second housing20may have one heat exchange unit40respectively at corresponding positions. In this case, the heat exchange units40are stacked and installed like the first housing10and the second housing20. However, one heat exchange unit40may supply air at a predetermined temperature to both the first housing10and the second housing20. As in the illustrated embodiment, the heat exchange unit40may use an air conditioning unit. However, it may use, for example, a chiller using that uses cooling water. As in the illustrated embodiment, the heat exchange unit40using an air conditioning unit that uses air as a heat exchange medium may provide air by controlling various physical properties such as humidity as well as the temperature of the air.

A control panel42may be located on one side of the outer surface of the first housing10. The control panel42may be located at a central height of one side of the outer surface of the first housing10. The control panel42may display an operational status of the system of the present disclosure. In addition, the control panel42is configured to perform power shutdown in an emergency. That is, an emergency shutdown switch may be placed on the control panel42. The control panel42is referenced toFIG.1.

Exhaust units44may be placed in a plurality of places in the first housing10and the second housing20. The exhaust unit44may flow air into and out of the inner spaces11and21under certain circumstances. For example, when a fire occurs inside and gas such as smoke is filled with a predetermined pressure or more, it may be actively exhausted to the outside through the exhaust unit44.

As shown inFIG.1, the exhaust unit44may be provided in various positions of the first housing10and the second housing20. The exhaust unit44may be divided into a suction side44iand a discharge side44e.In the illustrated embodiment, the discharge side44eis installed adjacent to a corner of the relatively upper portion of the first housing10and the second housing20. Here, a discharge fan (not shown) is provided so that the gas inside may be forcibly discharged to the outside. Among the exhaust units44, the suction sides44iare placed below the door bodies140and240of the door units14and24so that air is sucked into the inner spaces11and21from the outside. Gas including smoke is discharged through the discharge side exhaust unit44e,while outside air is introduced into the inner spaces11and21through the suction side exhaust unit44i.The suction side exhaust unit44ihas a damper (not shown) to prevent outside air from being sucked in during normal operation.

As shown inFIG.4, a control unit46may be installed on one side of the first inner space11of the first housing10. The control unit46may have battery protection, power supply, and communication functions. In this embodiment, the control unit46is installed only in the first housing10. Alternatively, the control unit46may be installed only on one side of the second inner space21of the second housing20.

As shown inFIG.4, the first inner space11and the second inner space21may each be provided with a fire extinguishing system47. The fire extinguishing system47may spray, for example, an aerosol containing a fire extinguishing agent. The fire extinguishing system47may serve to detect and extinguish a fire when a fire occurs in the battery pack32or the like in the rack30.

A spray system48may be provided at one side of the second inner space21. The spray system48supplies water directly to a specific battery pack when a fire occurs in the battery pack. In the present embodiment, the spray system48is installed in the second inner space21. Considering the height of the supplied water, it is preferable to install the spray system48in the second inner space21rather than in the first inner space11.

A configuration of a part where the second housing20is stacked in the first housing10will be described. As shown inFIG.6, a sealing member50may be installed around the edge of the first top plate122of the first housing10. The sealing member50may be made of an elastic material. The sealing member50may be made of urethane. The second housing20may be seated on the sealing member50. This state is shown inFIG.6.

A waterproof plate52may be installed simultaneously on the first housing10and the second housing20so that the sealing member50is not exposed to the outside. That is, the waterproof plate52is installed along the upper periphery of the first housing10and the lower periphery of the second housing20. The installed state of the waterproof plate52is well shown inFIG.6. When the waterproof plate52is installed on the first housing10and the second housing20, a packing53may be interposed therebetween. The waterproof plate52may be installed along a portion where the first housing10and the second housing20meet.

An anti-sag bracket56is used to better support the load of the second housing20stacked on the first housing10so that there is no sagging. The anti-sag bracket56supports the load of the second housing20by connecting the first housing frame12of the first housing10and the second housing frame22of the second housing20. More specifically, the vertical member121of the first housing10and the vertical member221of the second housing20are connected.

The anti-sag bracket56is well illustrated inFIGS.10and11. A protector body58forms the skeleton of the anti-sag bracket56. The protector body58has a plate shape elongated in one direction. Reinforcing pieces59for reinforcing in the longitudinal direction of the protector body58are provided orthogonally to each other. The reinforcing piece59has a length substantially equal to the length of the protector body58. A plurality of fastening holes58′ are formed at the upper and lower ends of the protector body58.

The first spacer block60and the second spacer block60′ are mounted on one surface of the protector body58. The first spacer block60and the second spacer block60′ may serve to fill a gap between the protector body58and the surfaces of the first and second housings10and20. The first spacer block60is smaller in size than the second spacer block60′. This is because the gap between the first housing10and the protector body58is smaller than the gap between the second housing20and the protector body58.

Meanwhile, a configuration for more firmly fastening the first housing10and the second housing20will be described. The first fastening part16at the corner of the first housing10and the second fastening part26at the corner of the second housing20are fastened with a twist lock mechanism62and a bridge fitting70. The twist lock mechanism62and the bridge fitting70may be used to maintain a double fastening state.

In the twist lock mechanism62, a first lock projection66and a second lock projection66′ are installed on the upper and lower surfaces of a lock body64to be rotatable at a predetermined angle at the same time. The degree of rotation of the first lock projection66and the second lock projection66′ may be simultaneously adjusted by a knob68. The first lock projection66is inserted into the first fastening hole16′ formed in the first fastening part16of the first housing10, and the second lock projection66′ is inserted into the second fastening hole26′ formed in the second fastening part26of the second housing20and rotated by the operation of the knob68. When the first lock projection66and the second lock projection66′ are rotated simultaneously by the operation of the knob68, they are fastened to the first fastening part16and the second fastening part26, respectively, so that the first housing10and the second housing20are hung together.

The bridge fitting70includes a screw rod72. The screw rod72has a thread formed on the outer surface thereof. A first lifting body74is movably installed on the screw rod72. The first lifting body74has a first lock projection76, which may be inserted into and hung from the first fastening hole16′ of the first fastening part16. A second lifting body74′ is movably installed on the screw rod72. The second lifting body74′ has a second lock projection76′, which may be inserted into and hung from the second fastening hole26′ of the second fastening part26.

The first lock projection76and the second lock projection76′ may be locked and released by the opposite movement of the first lifting body74and the second lifting body74′ according to the rotation of the screw rod72. The bridge fitting70may also serve to ensure close contact between the first housing10and the second housing20.

Hereinafter, the installation and use of the housing stacking type energy storage system according to the present disclosure having the above configuration will be described.

The housing stacking type energy storage system of the present disclosure is transported in a state in which most of the components are mounted inside the first housing10and the second housing20. At this time, the first housing10and the second housing20are transported in a separate state. After being transported to a desired location, the first housing10and the second housing20undergo an installation process.

The first housing10is placed on the ground, and the second housing20is stacked on top the first housing10. When the heat exchange unit40is installed and an electrical connection between the first housing10and the second housing20is made, it becomes usable.

A process of stacking the second housing20on the first housing10will be described in more detail. First, the sealing member50is placed around the first top plate122while the first housing10is seated on the ground. The sealing member50has a substantially rectangular frame shape and is positioned on the first top plate122. For reference, the first top plate122is supported on the horizontal member120.

Next, the lower edge of the second housing20is seated on the sealing member50. Accordingly, the sealing member50supports the second housing20while being compressed by the load of the second housing20.

The waterproof plate52is mounted so that the upper end of the first housing10and the lower end of the second housing20are simultaneously connected. At this time, a gasket53is interposed between the waterproof plate52and the first housing10and between the waterproof plate52and the second housing20. With this structure, it is possible to prevent moisture from entering the inner spaces11and21from the outside. Even if moisture penetrates or is generated by condensation inside, when it falls on the first top plate122, it is not transferred to the battery pack32of the first inner space11due to the waterproof fence124.

The first housing10and the second housing20are connected using the anti-sag bracket56to prevent sagging due to the load of the second housing20. That is, the anti-sag bracket56is mounted to connect between the vertical member121of the first housing10and the vertical member221of the second housing20. The anti-sag bracket56may be mounted on the front and rear surfaces of the first housing10and the second housing20. respectively.

In addition, in order to simultaneously fasten between the first housing10and the second housing20to each other, a twist lock mechanism62and/or a bridge fitting70are mounted on the first fastening part16and the second fastening part26.

During operation of the energy storage system of the present disclosure is in use, a large amount of heat is generated in the battery cell32. In order to dissipate this heat to the outside, relatively low temperature air is supplied from the heat exchange unit40. Normally, a relatively low temperature air is supplied from the heat exchange unit40to the inner spaces11and21in the direction of arrow A, as shown inFIG.9, through the flow path formed by the flow forming plate34and the partition plate36. On the other hand, the air receiving the heat generated from the battery cells32moves in the direction of arrow B and enters the heat exchange unit40so that the heat may be dissipated to the outside.

If a fire occurs during operation, the fire extinguishing system47is activated. The fire extinguishing system47sprays a fire extinguishing liquid to extinguish the fire. Additionally, the spray system may supply water directly to the battery cell32on fire to extinguish the fire.

In addition, if the pressure in the inner spaces11and21increases due to a fire or the like, the pressure is discharged to the outside to prevent damage to the entire system. In this case, the partition plate36is operated to discharge the pressure while the flow paths are connected to each other, as indicated by a solid line arrow inFIG.15. That is, when the partition plate body37rotates about the hinge37and opens, the flow path partitioned by the partition plate36is communicated with each other, and the flow path is connected from the first inner space11to the second inner space21.

In particular, the pressure discharge plate28on the roof of the second housing20is torn open by the pressure transmitted when the partition plate36is opened, so that the pressure is well discharged to the outside. Accordingly, the pressure in the inner spaces11and21may be smoothly discharged without damaging the first housing10or the second housing20. The dotted line inFIG.15shows that the pressure is discharged through the flow path formed even in normal times.

When maintenance work needs to be performed during operation, the door units14and24are opened as shown inFIG.2to access a place to be maintained. The door units14and24are formed in multiple numbers on the outer surfaces of the first housing10and the second housing20, so that maintenance work may be performed by accessing the inner spaces11and21from any position. In the case of the second housing20, an operator may not have direct access from the ground. In this case, a mobile platform having a lift or a fixedly installed steel working platform may be used.

Even though it has been described that all components constituting the embodiments of the present disclosure are combined into one or operated in combination with each other, the present disclosure is not necessarily limited to the embodiments. That is, within the scope of the objective of the present disclosure, all of the components may be selectively combined into at least one and operated. In addition, the terms such as “include”, “consist of”, or “have” described above mean that the corresponding component may be present unless otherwise stated, and thus should be construed that the terms do not exclude other components, but may further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs, unless defined otherwise. Generally used terms, such as terms defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present disclosure.

The above description is merely illustrative of the technical idea of the present disclosure, and those skilled in the art to which the present disclosure belongs may perform various modification and changes within the scope not departing from the essential characteristics of the present disclosure. Accordingly, the embodiments disclosed in the present disclosure are not intended to limit, but to explain the technical idea of the present disclosure, and the scope of the technical spirit of the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted by the claims below, and all technical spirits within the scope equivalent to the scope of the claims should be interpreted as being included in the scope of the claims of the present disclosure.

In the illustrated embodiment, the energy storage system is disclosed in which the first housing10and the second housing20are stacked in two layers, but the housings may be stacked in multiple layers, such as three and four layers. That is, the third housing, the fourth housing, and the like may be used to form various layers.