Safety-enhanced energy storage devices

Abstract

An energy storage device with enhanced safety according to an embodiment of the present invention includes: a control container including a main line, a main switch configured to be connected to the main line, and a main controller configured to control an operation state of the main switch; a battery container including a secondary line configured to be electrically connected to the main line, a battery unit configured to be connected to the secondary line, a sensing unit configured to detect whether a door is opened or closed, and a sub-controller configured to determine an open / closed state of the door based on a sensing signal received from the sensing unit and transmit the determined open / closed state to the main controller.

Description

[Technical Field]

[0001] This application claims priority based on Korean Patent Application No. 10-2022-0055929, filed on May 6, 2022, the entire contents of which are incorporated herein by reference in their entirety in the specification and drawings thereof.

[0002] The present invention relates to an energy storage system (ESS), and more particularly to an energy storage system with enhanced safety. [Background technology]

[0003] In recent years, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has grown rapidly and the development of electric vehicles, energy storage batteries, robots, satellites, and other products has progressed in earnest, active research has been conducted into high-performance secondary batteries that can be repeatedly charged and discharged.

[0004] Currently commercially available batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium batteries. Of these, lithium batteries are attracting attention due to their advantages of being able to be freely charged and discharged since they have almost no memory effect compared to nickel-based batteries, an extremely low self-discharge rate, and a high energy density.

[0005] An energy storage device using such a battery can store a large amount of power and provide the stored power to multiple load facilities. For example, energy storage devices are used in forms such as energy management systems for industries, buildings, or homes, and are used as a continuous power grid and / or an emergency power grid by providing stored power to load facilities at each usage location.

[0006] Conventionally, maintenance work is performed after an operator operates the cutoff switch of the energy storage device to cut off power. During this maintenance process, there is a risk of loss of life due to carelessness on the part of the operator or malfunction of the cutoff switch. Therefore, in order to improve worker safety, a technology that can automatically control the cutoff switch under maintenance conditions is desired. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been created to solve the above problems, and aims to provide an energy storage device with enhanced safety that can control a cutoff switch for the safety of workers.

[0008] Other objects and advantages of the present invention will become apparent from the following description and the accompanying drawings, in which: FIG. 1 is a block diagram of a semiconductor device according to an embodiment of the present invention; [Means for solving the problem]

[0009] An enhanced safety energy storage device according to one aspect of the present invention may include a control container and a battery container.

[0010] The control container may include a main line, a main switch configured to be connected to the main line, and a main controller configured to control an operational state of the main switch.

[0011] The battery container may include a secondary line configured to be electrically connected to the main line, a battery unit configured to be connected to the secondary line, a sensing unit configured to sense whether a door installed therein is open or closed, and a secondary control unit configured to determine the open / closed state of the door based on a sensing signal received from the sensing unit and transmit the determined open / closed state to the main control unit.

[0012] The main control unit may be configured to control the operation state of the main switch to a turn-off state when the door is in an open state, thereby cutting off the connection between the main line and the sub-line.

[0013] The main control unit may be configured to control the operation state of the main switch to a turned-on state when the door is in a closed state, thereby connecting the main line and the sub-line.

[0014] The battery container may be configured with multiple doors.

[0015] The sensing unit may be configured to sense whether each of the plurality of doors is open or closed.

[0016] The main control unit may be configured to control the operational state of the main switch to a turned-off state when at least one of the plurality of doors is in the open state.

[0017] When a plurality of the battery containers are deployed, the secondary lines may be connected in series to each other, so that the main line and the secondary lines form one power line.

[0018] The main control unit may be configured to control the operating state of the main switch to a turned-off state when at least one door of the plurality of battery containers is in an open state.

[0019] The battery container may further include a secondary switch connected between the secondary line and the battery unit, the secondary switch being configured to have an operating state controlled by the secondary control unit.

[0020] The sub-controller may be configured to control an operating state of the sub-switch based on the determined open / closed state.

[0021] The sub-controller may be configured to control the operation state of the sub-switch to a turn-off state when the door is in an open state, thereby cutting off the connection between the sub-line and the battery unit.

[0022] The sub-controller may be configured to control the operation state of the sub-switch to a turn-on state when the door is in a closed state, thereby connecting the sub-line and the battery unit.

[0023] According to another aspect of the present invention, the energy storage device with enhanced safety may further include a bus bar configured to electrically connect the control container and the battery container by connecting one end and the other end to the main line and the secondary line, respectively.

[0024] A safety-enhanced energy storage device according to another aspect of the present invention may further include a cable configured to communicatively connect the main control unit and the sub-control unit by connecting one end to the main control unit and the other end to the sub-control unit, respectively. [Effects of the Invention]

[0025] According to one embodiment of the present invention, the battery container can be shut down depending on whether a door included in the battery container is open or not, which has the advantage of guiding workers to work on the battery container safely.

[0026] The effects of the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0027] The drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further understand the technical concepts of the present invention as well as the content of the invention, and therefore the present invention should not be interpreted as being limited to only the matters depicted in the drawings. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a diagram illustrating a schematic diagram of an energy storage device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view of an energy storage device according to one embodiment of the present invention. [Figure 3] FIG. 2 is a diagram illustrating a control container according to an embodiment of the present invention. [Figure 4] FIG. 1 is a schematic diagram of a battery container according to an embodiment of the present invention. [Figure 5] FIG. 1 is a diagram illustrating a schematic diagram of an exemplary configuration of an energy storage device according to an embodiment of the present invention. [Figure 6] 2 is a diagram illustrating an exemplary configuration of a sub-controller and a sensing unit according to an embodiment of the present invention; [Figure 7] 2 is a diagram illustrating an exemplary configuration of a sub-controller and a sensing unit according to an embodiment of the present invention; [Figure 8] FIG. 10 is a diagram illustrating an exemplary configuration of an energy storage device according to another embodiment of the present invention. [Figure 9] FIG. 10 is a diagram illustrating an exemplary configuration of an energy storage device according to yet another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts corresponding to the technical ideas of the present invention, in accordance with the principle that the inventor can appropriately define the concepts of terms himself / herself in order to best explain the invention.

[0030] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely preferred embodiments of the present invention and do not represent the entire technical idea of the present invention, and that there may be various equivalents and modifications that can be substituted therefor at the time of this application.

[0031] Furthermore, when describing the present invention, if it is recognized that a specific description of a known configuration or function related to the present invention may obscure the gist of the present invention, such a detailed description will be omitted.

[0032] Phrases including ordinal numbers such as first and second are used to distinguish one of various components from the other components, and do not limit the components.

[0033] Throughout this specification, when a part is said to "comprise" a certain element, this does not mean that it may further include other elements, unless otherwise specified.

[0034] Furthermore, throughout this specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" via another element in between.

[0035] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0036] Figure 1 is a schematic diagram of an energy storage device 10 according to one embodiment of the present invention. Figure 2 is a perspective view of the energy storage device 10 according to one embodiment of the present invention.

[0037] Referring to FIG. 1 , the energy storage device 10 may include a control container 100 and a battery container 200 .

[0038] The control container 100 and the battery container 200 may be electrically and communicatively connected. The control container 100 may be referred to as an E-LINK, and the battery container 200 may be referred to as a B-LINK.

[0039] The energy storage device 10 may also include a water supply container (not shown). The water supply container is controlled by the control container 100 and / or the battery container 200 and may supply a fire extinguishing liquid (e.g., water) to the battery container 200 in the event of a fire in the battery container 200.

[0040] Specifically, the control container 100 may be connected to a power conversion system (PCS) to supply power to the internal components of the control container 100 and the battery container 200. The control container 100 may also include a monitoring unit (not shown) capable of comprehensively monitoring the energy storage device 10.

[0041] The battery container 200 may include a plurality of battery racks loaded with battery modules, a fire suppression unit (e.g., an air conditioning unit, a fire extinguishing unit, and a ventilation unit), etc. The battery container 200 may form a power line and a communication line with the control container 100.

[0042] 2, the energy storage device 10 may include a control container 100 and a battery container 200. The control container 100 and the battery container 200 may be connected to each other by wire, thereby forming a power line and a communication line between the control container 100 and the battery container 200.

[0043] FIG. 3 is a schematic diagram of a control container 100 according to one embodiment of the present invention.

[0044] Referring to FIG. 3, the control container 100 may include a main line 110, a main switch 120, and a main control unit .

[0045] The main line 110 may be a power line contained in the control container 100. For example, the main line 110 may be a direct current line (DC line).

[0046] The main switch 120 may be configured to be connected to the main line 110. For example, the main switch 120 may be connected in series with the main line 110.

[0047] The master controller 130 may be configured to control the operating state of the master switch 120 .

[0048] Specifically, the main control unit 130 may control the operating state of the main switch 120 to a turned-on state or a turned-off state. For example, when the operating state of the main switch 120 is turned-on, the main line 110 may be electrically connected. Conversely, when the operating state of the main switch 120 is turned-off, the main line 110 may be electrically disconnected.

[0049] Figure 4 is a schematic diagram of a battery container 200 according to one embodiment of the present invention. Figure 5 is a schematic diagram of an exemplary configuration of an energy storage device 10 according to one embodiment of the present invention.

[0050] Referring to FIG. 4 , the battery container 200 may include a sub-line 210, a battery unit 220, a sensing unit 230, and a sub-control unit 240.

[0051] The secondary line 210 may be configured to be electrically connected to the primary line 110 .

[0052] Specifically, the secondary line 210 may be a power line, similar to the main line 110. For example, the secondary line 210 may be a DC line, similar to the main line 110. The secondary line 210 may be electrically connected to the main line 110 by electrically connecting the control container 100 and the battery container 200.

[0053] For example, in the embodiment of FIG. 5, the main line 110 and the secondary line 210 may be electrically connected.

[0054] The battery unit 220 may be configured to be connected to the sub-line 210. Specifically, the battery unit 220 may include a plurality of battery racks BR1 to BRn, and each of the battery racks BR1 to BRn may include a plurality of battery modules.

[0055] For example, the battery unit 220 may include a plurality of battery racks BR1 to BRn. In the embodiment of Fig. 5, the battery unit 220 may include a first battery rack BR1, a second battery rack BR2, and an n-th battery rack BRn, where n is a natural number equal to or greater than 2 and may be determined based on a variety of factors, such as the size of the battery container 200 and the allowable capacity of the energy storage device 10.

[0056] The sensing unit 230 may be configured to sense whether the door 260 disposed in the battery container 200 is opened or closed.

[0057] Specifically, the sensing unit 230 may sense whether the door 260 disposed in the battery container 200 is opened or closed. For example, the sensing unit 230 may be a magnetic sensor, a piezoelectric sensor, an optical sensor, or the like that can sense whether the door 260 is opened or closed.

[0058] For example, the sensing unit 230 may include a plurality of sensing units S1 to Sn. In the embodiment of Fig. 5, the sensing unit 230 may include a first sensing unit S1, a second sensing unit S2, and an n-th sensing unit Sn.

[0059] Preferably, the battery container 200 may be configured to include a plurality of doors 260. The sensing unit 230 may be configured to sense whether each of the plurality of doors 260 is open or closed. Generally, the battery container 200 may include a number of doors 260 corresponding to the number of battery racks so that a worker can perform work (e.g., maintenance) on each battery rack. That is, a worker can open the door 260 corresponding to the battery rack for work and then perform work on that battery rack. Therefore, in the embodiment of FIG. 5, the battery container 200 may include n doors 260 corresponding to the n battery racks. The sensing unit 230 may include n sensing units S1 to Sn corresponding to the n doors 260.

[0060] The sub-controller 240 may be communicatively connected to the sensing unit 230. The sub-controller 240 may be configured to determine the open / closed state of the door 260 based on the sensing signal received from the sensing unit 230.

[0061] 6 and 7 are diagrams illustrating exemplary configurations of the sub-controller 240 and the sensing unit 230 according to an embodiment of the present invention.

[0062] The sub-controller 240 may be connected to the sensing units S1 to Sn included in the sensing section 230 to form a closed circuit. For example, in the embodiment of FIG. 6, the sub-controller 240 may be connected to the first sensing unit S1, which may be connected to the second sensing unit S2. The n-th sensing unit Sn may then be connected to the sub-controller 240. This allows for the formation of a closed circuit connecting the sub-controller 240, the first sensing unit S1, the second sensing unit S2, and the n-th sensing unit Sn. Note, however, that resistors and other elements are omitted from the closed circuit of FIG. 6 for ease of explanation.

[0063] For example, the sensing units S1 to Sn may be magnetic sensors. That is, each of the sensing units S1 to Sn may include a first magnetic unit and a second magnetic unit. When the door 260 is opened (open door case), the first magnetic unit and the second magnetic unit are separated, and therefore the operating state of the sensing unit may be turned off. Conversely, when the door 260 is closed (closed door case), the first magnetic unit and the second magnetic unit are connected, and therefore the operating state of the sensing unit may be turned on.

[0064] 7, when all of the n doors 260 are closed, the operation states of the n sensing units S1 to Sn may all be turned on. In this case, the closed circuit connecting the sub-controller 240 and the sensing unit 230 may be electrically connected. Therefore, the sub-controller 240 can determine the open / closed state of the doors 260 provided in the battery container 200 by detecting whether the closed circuit is connected.

[0065] The sub-controller 240 may be configured to transmit the determined open / closed state to the main controller 130 .

[0066] Specifically, the sub-controller 240 can transmit open / close state information indicating the open state or the closed state to the main controller 130.

[0067] The main control unit 130 may be configured to control the operation state of the main switch 120 to a turned-off state when the door 260 is in an open state, thereby disconnecting the main line 110 and the secondary line 210. Conversely, the main control unit 130 may be configured to control the operation state of the main switch 120 to a turned-on state when the door 260 is in a closed state, thereby connecting the main line 110 and the secondary line 210.

[0068] Specifically, one end of the main switch 120 may be connected to the secondary line 210 via the main line 110. The other end of the main switch 120 may be connected to a PCS (not shown) via the main line 110.

[0069] For example, if the operating state of the main switch 120 is controlled to the turn-off state, the connection between the PCS and the control container 100 and the battery container 200 may be interrupted. Therefore, the electrical connection between the main line 110 and the secondary line 210 may be interrupted.

[0070] In another example, if the operating state of the main switch 120 is controlled to be turned on, the PCS may be electrically connected to the control container 100 and the battery container 200. Therefore, the main line 110 and the secondary line 210 may be electrically connected to each other.

[0071] In particular, the main control unit 130 may be configured to control the operational state of the main switch 120 to a turned-off state when at least one of the plurality of doors 260 is in an open state.

[0072] Specifically, when at least one of the doors 260 arranged in the battery container 200 is opened, the sub-controller 240 can transmit open / closed state information indicating the open state to the main controller 130. The main controller 130, which has received the open / closed state information indicating the open state, can control the operating state of the main switch 120 to a turned-off state, thereby cutting off the connection between the main line 110 and the sub-line 210. Therefore, when all of the doors 260 arranged in the battery container 200 are closed, the operating state of the main switch 120 can be controlled to a turned-on state, and the main line 110 and the sub-line 210 can be electrically connected.

[0073] The energy storage device 10 according to an embodiment of the present invention may cut off power to the battery container 200 depending on whether the door 260 provided on the battery container 200 is open or closed. That is, power to the battery container 200 may be cut off as soon as the door 260 is opened, even if an operator does not manually control the operation state of the main switch 120 to the off state. Therefore, the battery container 200 is in an electrically safe state, thereby enhancing the safety of the operator. This has the advantage of preventing fatal accidents due to operator negligence.

[0074] FIG. 8 is a diagram illustrating a schematic diagram of an exemplary configuration of an energy storage device 10 according to another embodiment of the present invention.

[0075] 1 and 8, the battery container 200 may further include a secondary switch 250.

[0076] The secondary switch 250 may be configured to be connected between the secondary line 210 and the battery section 220 .

[0077] Specifically, one end of the secondary switch 250 may be connected to the secondary line 210, and the other end may be connected to the battery unit 220. The line connected to the other end of the secondary switch 250 may be connected to each of the plurality of battery racks BR1 to BRn included in the battery unit 220. In other words, the secondary switch 250 may be connected to a common line that connects the secondary line 210 and the plurality of battery racks BR1 to BRn.

[0078] 8, the secondary switch 250 may be connected between the secondary line 210 and the battery unit 220. Depending on the operating state of the secondary switch 250, the secondary line 210 and the battery unit 220 may be electrically connected or disconnected.

[0079] The secondary switch 250 can be configured such that the operating state is controlled by the secondary control unit 240 .

[0080] Specifically, the sub-controller 240 may be configured to control the operation state of the sub-switch 250 based on the determined open / closed state. For example, the sub-controller 240 may control the operation state of the sub-switch 250 to a turned-on state or a turned-off state based on the determined open / closed state.

[0081] For example, the sub-controller 240 may be configured to control the operation state of the sub-switch 250 to a turn-off state when the door 260 is in an open state, thereby disconnecting the sub-line 210 from the battery unit 220. Conversely, the sub-controller 240 may be configured to control the operation state of the sub-switch 250 to a turn-on state when the door 260 is in a closed state, thereby connecting the sub-line 210 from the battery unit 220.

[0082] That is, the sub-control unit 240 determines whether the door 260 installed in the battery container 200 is open or closed through the sensing unit 230, and can cut off the electrical connection between the sub-line 210 and the battery unit 220 when the door 260 is closed.

[0083] The energy storage device 10 according to one embodiment of the present invention can enhance safety for workers by controlling the main switch 120 included in the control container 100 and / or the sub switch 250 included in the battery container 200 to a turned-off state when the door 260 of the battery container 200 is opened.

[0084] In particular, even if the operating state of the main switch 120 is not controlled to the turned-off state due to carelessness or a malfunction of the operator, the operating state of the sub switch 250 is controlled to the turned-off state, thereby further enhancing safety for the operator.

[0085] With further reference to FIG. 1 , the energy storage device 10 may further include a bus bar 300 and a cable 400 .

[0086] The bus bar 300 may be configured to electrically connect the control container 100 and the battery container 200 by connecting one end and the other end to the main line 110 and the secondary line 210, respectively.

[0087] 2, 5 and 8, for example, the bus bar 300 may be connected between the control container 100 and the battery container 200. In particular, one end of the bus bar 300 may be connected to the main line 110 of the control container 100, and the other end of the bus bar 300 may be connected to the secondary line 210 of the battery container 200. Thus, a power line including the main line 110, the bus bar 300 and the secondary line 210 may be formed.

[0088] The cable 400 can be configured to connect the main control unit 130 and the sub-control unit 240 so that one end and the other end are connected to the main control unit 130 and the sub-control unit 240, respectively, so as to communicatively connect the main control unit 130 and the sub-control unit 240.

[0089] 2, 5, and 8, the cable 400 may be connected between the control container 100 and the battery container 200. In particular, one end of the cable 400 may be connected to the main control unit 130 of the control container 100, and the other end of the cable 400 may be connected to the sub-control unit 240 of the battery container 200. Thus, a communication line including the main control unit 130, the cable 400, and the sub-control unit 240 may be formed.

[0090] FIG. 9 is a diagram schematically illustrating an exemplary configuration of an energy storage device 10 according to yet another embodiment of the present invention.

[0091] A plurality of battery containers 200 may be deployed. Specifically, when a plurality of battery containers 200 are deployed, the secondary lines 210 may be connected in series to each other, so that the main line 110 and the plurality of secondary lines 210 form one power line.

[0092] 9, the energy storage device 10 may include a first battery container 201, a second battery container 202, and a third battery container 203. The control container 100 and the plurality of battery containers 200 may be electrically connected via a bus bar 300. For example, the main line 110 of the control container 100 and the secondary lines 210 of the first to third battery containers 201, 202, and 203 may form one power line.

[0093] 9, the control container 100 and the plurality of battery containers 200 may be communicatively connected via a cable 400. Preferably, a communication line between the control container 100 and the plurality of battery containers 200 may be formed according to a home-run method or a daisy chain method. For example, according to the home-run method, the control container 100 may be communicatively connected to the first to third battery containers 201, 202, and 203, respectively. Then, according to the daisy chain method, the control container 100 may be connected to the first battery container 201, the first battery container 201 may be connected to the second battery container 202, and the second battery container 202 may be connected to the third battery container 203.

[0094] 9, the energy storage device 10 includes three battery containers 200. However, the battery containers 200 may be connected to each other via bus bars 300 and cables 400. That is, the structure of the battery containers 200 is an expandable modular structure. Therefore, the number of battery containers 200 included in the energy storage device 10 can be easily expanded via connecting members (e.g., bus bars and cables).

[0095] For example, the main control unit 130 may be configured to control the operating state of the main switch 120 to a turned-off state when at least one door 260 of the multiple battery containers 200 is in an open state. In the embodiment of FIG. 9 , when at least one of all the doors 260 included in the first to third battery containers 201, 202, and 203 is opened, the main control unit 130 may control the operating state of the main switch 120 to a turned-off state. In this case, the power line formed by the control container 100 and the first to third battery containers 201, 202, and 203 is disconnected, and the first to third battery containers 201, 202, and 203 may be shut down. Therefore, an operator can safely perform work on the battery containers 200.

[0096] As another example, when at least one door 260 of the multiple battery containers 200 is in an open state, the main control unit 130 does not control the operational state of the main switch 120, and the sub-control unit 240 in each of the multiple battery containers 200 controls the operational state of the sub-switch 250. The sub-control unit 240 may be configured to control the operational state of the corresponding sub-switch 250 to a turned-off state when the door 260 is in an open state. In the embodiment of FIG. 9 , assume that the doors 260 included in the first battery container 201 and the third battery container 203 are both in a closed state, and at least one of the doors 260 included in the second battery container 202 is in an open state. The sub-control unit 240 included in the second battery container 202 may control the operational state of the corresponding sub-switch 250 to a turned-off state. In this case, electrical connections between the control container 100 and the first battery container 201 and the third battery container 203 are maintained, and only the second battery container 202 may be in a shutdown state. Therefore, workers can safely perform work on the second battery container 202 without having to shut down all of the multiple battery containers 200.

[0097] As yet another example, when at least one door 260 of the multiple battery containers 200 is in an open state, the main control unit 130 may control the operational state of the main switch 120 to a turned-off state. Then, the sub-control unit 240 included in the battery container 200 whose door 260 is open may control the operational state of the corresponding sub-switch 250 to a turned-off state. As in the above-described embodiment, in the embodiment of FIG. 9 , it is assumed that the doors 260 included in the first battery container 201 and the third battery container 203 are all in a closed state, and at least one door 260 included in the second battery container 202 is in an open state. Because at least one door 260 included in the multiple battery containers 200 is open, the main control unit 130 may control the operational state of the main switch 120 to a turned-off state. Also, the sub-control unit 240 included in the second battery container 202 may control the operational state of the corresponding sub-switch 250 to a turned-off state. That is, by controlling both the main switch 120 and the sub switch 250 to the turned-off state, it is possible to completely cut off the power to the second battery container 202. Therefore, it is possible to further enhance safety for workers.

[0098] Meanwhile, the main control unit 130 and the sub-control unit 240 may optionally include a processor, application specific integrated circuit (ASIC), other chipset, logic circuit, register, communication modem, data processing device, etc., known in the art, to execute various control logics implemented in the present invention. When the control logic is implemented by software, the main control unit 130 and the sub-control unit 240 may be implemented by a collection of program modules. In this case, the program modules are stored in a memory (not shown) and can be executed by the main control unit 130 and / or the sub-control unit 240. The memory may be any known information storage means capable of recording, erasing, updating, and reading data. For example, the information storage means may include random access memory (RAM), flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), registers, etc.

[0099] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited to these, and it goes without saying that various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains within the technical spirit of the present invention and the scope of equivalents of the claims.

[0100] Furthermore, the present invention described above is susceptible to various substitutions, modifications, and alterations by a person having ordinary knowledge in the technical field to which the present invention pertains, within the scope of the technical concept of the present invention. Therefore, the present invention is not limited to the above-described embodiments and the accompanying drawings, but may be configured by selectively combining all or part of each embodiment for various modifications. [Explanation of symbols]

[0101] 10 Energy storage device 100 Control Container 110 Main Line 120 Main Switch 130 Control Unit 200 Battery Container 210 Secondary Line 220 Battery section 230 Sensing Unit 240 Sub-controller 250 Secondary Switch 260 Door 300 Busbar 400 Cable

Claims

1. a control container including a main line, a main switch configured to be connected to the main line, and a main control unit configured to control an operational state of the main switch; a battery container including: a secondary line configured to be electrically connected to the main line; a battery unit configured to be connected to the secondary line; a sensing unit configured to sense whether a door provided thereon is opened or closed; and a secondary control unit configured to determine an open / closed state of the door based on a sensing signal received from the sensing unit and to transmit the determined open / closed state to the main control unit; 1. A safety-enhanced energy storage device, including:

2. The main control unit When the door is in an open state, the operation state of the main switch is controlled to a turn-off state to cut off the connection between the main line and the sub-line; 2. The energy storage device with enhanced safety according to claim 1, wherein the device is configured to control the operational state of the main switch to a turned-on state to connect the main line and the secondary line when the door is in a closed state.

3. The battery container It is configured with multiple doors, The sensing unit The safety-enhanced energy storage device of claim 2 , configured to sense whether each of the plurality of doors is open or closed.

4. The main control unit 4. The safety-enhanced energy storage device of claim 3, configured to control an operational state of the main switch to a turned-off state when at least one of the plurality of doors is in the open state.

5. The battery container When a plurality of the sub-lines are provided, the sub-lines are connected in series to each other, so that the main line and the plurality of sub-lines form one power line, The main control unit 3. The safety-enhanced energy storage device of claim 2, wherein the device is configured to control an operational state of the main switch to a turned-off state when a door of at least one of the plurality of battery containers is in an open state.

6. The battery container 6. The safety-enhanced energy storage device of claim 1, further comprising a secondary switch connected between the secondary line and the battery section, the secondary switch being configured to have an operating state controlled by the secondary control section.

7. The sub-control unit The safety-enhanced energy storage device of claim 6 , configured to control an operational state of the secondary switch based on the determined open / closed state.

8. The sub-control unit When the door is in an open state, the operation state of the secondary switch is controlled to a turn-off state to cut off the connection between the secondary line and the battery unit; 8. The energy storage device with enhanced safety according to claim 7, wherein the secondary switch is controlled to be turned on when the door is closed to connect the secondary line and the battery unit.

9. 2. The safety-enhanced energy storage device of claim 1, further comprising a bus bar configured to electrically connect the control container and the battery container by connecting one end and the other end to the main line and the secondary line, respectively.

10. 2. The safety-enhanced energy storage device of claim 1, further comprising a cable configured to communicatively connect the main control unit and the sub-control unit by connecting one end to the main control unit and the other end to the sub-control unit, respectively.

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