Energy storage system

Abstract

The utility model discloses an energy storage system which comprises a box body, a battery bin and an electrical bin are arranged in the box body and are mutually independently arranged, the energy storage system further comprises a nitrogen device, the nitrogen device comprises a nitrogen making mechanism and a gas conveying pipeline assembly, and the nitrogen making mechanism is connected with the gas conveying pipeline assembly. The nitrogen making mechanism injects nitrogen into the battery bin and the electrical bin through the gas conveying pipeline assembly. According to the utility model, the fireproof effect of the energy storage container is improved, the normal work of the battery is ensured, the service life of the battery is prolonged, and the safety of the energy storage container is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the energy storage technology field especially relates to an energy storage system. BACKGROUND

[0002] The energy storage container is one of the most common energy storage systems, and mainly includes a battery compartment and an electrical compartment. The battery compartment includes a battery pack, a battery management system, etc.; the electrical compartment includes an energy storage converter, an inverter, a power distribution cabinet, and other components. The energy storage container may catch fire when used improperly, and thus has certain safety hazards. Therefore, it is necessary to develop an energy storage container with higher safety performance. SUMMARY

[0003] The current energy storage container heat dissipation and fire prevention problem mainly focuses on the research on the battery compartment, while the electrical compartment is often ignored. However, the electrical compartment also has the risk of fire in the actual use process of the container, thereby affecting the use safety of the entire energy storage container. In order to overcome these shortcomings and deficiencies, the purpose of the utility model is to provide an energy storage system, improve the fireproof effect, ensure the normal work of the battery, prolong the service life of the battery, and improve the safety of the energy storage container.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] An energy storage system includes a box body, a battery compartment, and an electrical compartment. The battery compartment and the electrical compartment are independently arranged. The energy storage system further includes a nitrogen device, which includes a nitrogen production mechanism and a gas pipeline assembly. The nitrogen production mechanism injects nitrogen into the battery compartment and the electrical compartment through the gas pipeline assembly.

[0006] In an embodiment, the battery compartment is multiple, and the multiple battery compartments are arranged along the length direction of the box body. The electrical compartment is arranged on one side of the box body along the length direction.

[0007] In an embodiment, the box body further includes a nitrogen production compartment, and the nitrogen device is arranged inside the nitrogen production compartment.

[0008] In an embodiment, the battery compartment includes a first compartment door, which is used to seal the battery compartment. The first compartment door is provided with a first exhaust valve.

[0009] In an embodiment, the electrical compartment further includes a second compartment door, which is used to seal the electrical compartment. The second compartment door is provided with a second exhaust valve.

[0010] In an embodiment, the gas pipeline assembly comprises a first pipeline and a second pipeline, the nitrogen generating mechanism is communicated with the electrical bin through the first pipeline, and the nitrogen generating mechanism is communicated with the battery bin through the second pipeline.

[0011] In an embodiment, the battery bin is multiple, the second pipeline comprises a second main pipeline and multiple branch pipelines, one branch pipeline is connected with one battery bin, and the multiple branch pipelines are connected with one end of the second main pipeline.

[0012] In an embodiment, a first main electromagnetic valve is arranged on the first pipeline, and a second main electromagnetic valve is arranged on the second main pipeline; the first main electromagnetic valve and the second main electromagnetic valve are electrically connected with the nitrogen device.

[0013] In an embodiment, the nitrogen generating mechanism comprises an air compressor, a filter, a nitrogen generator and a nitrogen storage bottle connected in sequence, and an outlet end of the nitrogen storage bottle is communicated with the gas pipeline assembly.

[0014] In an embodiment, the box body is provided with explosion-proof plates, the top of the box body is provided with exhaust ports corresponding to positions of the battery bins, and one explosion-proof plate is installed at and seals one exhaust port.

[0015] In an embodiment, the explosion-proof plate comprises a frame body and a weak part, the weak part is arranged in the frame body, and the frame body and the box body are fixed by bolts, so as to be installed on the exhaust port.

[0016] In an embodiment, oxygen concentration sensors are arranged in the battery bin and the electrical bin, and the oxygen concentration sensors are electrically connected with the nitrogen device.

[0017] In an embodiment, the internal pressure of the box body is greater than the atmospheric pressure, and the difference between the internal pressure and the atmospheric pressure is A, wherein 5pa≤A≤1000pa.

[0018] In an embodiment, 5pa≤A≤500pa, or 5pa≤A≤200pa, or 5pa≤A≤100pa, or 10pa≤A≤200pa, or 5pa≤A≤50pa, or 5pa≤A≤20pa.

[0019] The beneficial effects of the utility model lie in that the bin bodies are independently arranged, so that the heat runaway does not spread; nitrogen is injected into the battery bin and the electrical bin, so that the battery bin and the electrical bin are in a low-oxygen environment, the fireproof effect is good, the normal work of the battery is facilitated, the service life of the battery is prolonged, and the safety of the whole energy storage system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained without creative labor on the basis of the drawings.

[0021] Figure 1 is a structural schematic diagram of the energy storage system of the embodiment of the present application;

[0022] Figure 2 is Figure 1 is a structural schematic diagram of the first door of one battery compartment in the embodiment of the present application after being opened;

[0023] Figure 3 is a structural schematic diagram of the explosion-proof plate;

[0024] Figure 4 is a structural schematic diagram of the nitrogen device;

[0025] Figure 5 is a layout schematic diagram of the gas pipeline assembly.

[0026] In the drawings: 1, box body; 11, exhaust port; 2, battery compartment; 21, first door; 211, first exhaust valve; 3, electrical compartment; 31, second door; 311, second exhaust valve; 4, nitrogen making compartment; 5, nitrogen making mechanism; 51, air compressor; 52, filter; 53, nitrogen generator; 54, nitrogen storage bottle; 6, gas pipeline assembly; 61, first pipeline; 611, first main electromagnetic valve; 62, second pipeline; 621, second main pipeline; 622, branch pipeline; 623, second main electromagnetic valve; 624, branch electromagnetic valve; 7, explosion-proof plate; 71, frame body; 72, weak part; 8, bolt; 9, liquid cooling compartment. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the description of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] In the description of the utility model, unless another definite provision and limitation, the term "arrange", "install", "connect" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms can be understood according to specific circumstances.

[0029] The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, and is merely for the convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] The terms "first", "second", "third" and the like are merely for distinguishing similar attributes, and do not indicate or imply relative importance or a particular order.

[0031] The term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, in addition to containing the listed elements, other elements not explicitly listed can also be contained.

[0032] The utility model provides a kind of energy storage system, as shown in Figures 1 to 5 The utility model provides a kind of energy storage system, as shown in

[0033] In the embodiment, each bin body is independently arranged, so that when thermal runaway occurs in one bin body, the thermal runaway does not spread to the adjacent bin body, thereby reducing the loss; the nitrogen prepared by the nitrogen preparation mechanism 5 is respectively input into the battery bin 2 and the electrical bin 3, which can effectively remove the oxygen in the battery bin 2 and the electrical bin 3, so that the inside of the battery bin 2 and the electrical bin 3 is in a low-oxygen environment, the fireproof effect is good, and the normal work of the battery is facilitated, the service life of the battery is prolonged, and the safety of the entire energy storage system is improved; and the oxygen can be prevented from participating in the electrode reaction or reacting with the battery material, thereby protecting the stability and safety of the battery; the water vapor in the bin body can also be discharged, so that the bin body remains dry, so as to prevent the bin body from being contaminated by moisture or mold and affecting the performance and service life of the battery or the power distribution equipment; at the same time, the nitrogen can take away part of the heat in the battery bin 2 and the electrical bin 3, thereby playing a cooling role, so as to reduce the temperature in the battery bin 2 and the electrical bin 3, and further improve the safety and service life of the battery and the power distribution equipment.

[0034] The nitrogen device includes a controller (not shown), and the nitrogen preparation mechanism 5 and the gas pipeline assembly 6 are electrically connected with the controller. The controller is used for controlling the nitrogen preparation mechanism 5 to prepare nitrogen and controlling the opening and closing of the gas pipeline assembly 6, so as to intelligently control the nitrogen preparation process of the energy storage system, intelligently, accurately and quickly input nitrogen into the battery bin 2 and / or the electrical bin 3 with excessively high oxygen content, and reduce the manual input.

[0035] As an implementation mode, as shown in Figure 1 and Figure 2 , the battery bin 2 is a plurality of battery bins, and the plurality of battery bins 2 are arranged along the length direction of the box body 1. The electrical bin 3 is arranged on one side of the box body 1 along the length direction, and the electrical bin 3 is arranged on the outermost side of the box body 1 and close to one battery bin 2.

[0036] As an implementation mode, as shown in Figure 1 and Figure 2 , the box body 1 further includes a nitrogen preparation bin 4, and the nitrogen device is arranged in the nitrogen preparation bin 4. The nitrogen preparation bin 4 inputs nitrogen into the battery bin 2 and the electrical bin 3 through the built-in nitrogen preparation bin 4 of the box body 1.

[0037] As an implementation mode, as shown in Figure 1 and Figure 2 , the nitrogen preparation bin 4 is located at the top of the electrical bin 3, which can reduce the occupied space at the bottom of the box body 1; the sum of the height of the electrical bin 3 and the height of the nitrogen preparation bin 4 is equal to the height of the battery bin 2, so as to reasonably utilize the space of the box body 1 in the height direction and facilitate the use of a common top plate, thereby facilitating the design and installation.

[0038] As an implementation mode, as shown in Figure 1 and Figure 2As shown in the figure, the battery compartment 2 comprises a first compartment door 21 for sealing the battery compartment 2, and a first exhaust valve 211 is arranged on the first compartment door 21. The first exhaust valve 211 can be a one-way valve that only opens from the inside of the battery compartment 2 to the outside. When nitrogen is introduced into the battery compartment 2, the nitrogen can carry the gas in the battery compartment 2 out of the battery compartment 2 through the one-way valve, thereby reducing the amount of oxygen in the battery compartment 2 and maintaining the air pressure balance in the battery compartment 2. Of course, the first exhaust valve 211 can be another exhaust valve electrically connected to the controller of the nitrogen device. When the nitrogen device is delivering nitrogen to the battery compartment 2, the controller controls the first exhaust valve 211 to open to exhaust the gas in the battery compartment 2 and maintain the air pressure balance in the battery compartment 2. When the nitrogen device is not delivering nitrogen to the battery compartment 2, the controller controls the first exhaust valve 211 to close to prevent external air from entering the battery compartment 2.

[0039] As an embodiment, as shown in Figure 1 and Figure 2 The electrical compartment 3 also comprises a second compartment door 31 for sealing the electrical compartment 3, and a second exhaust valve 311 is arranged on the second compartment door 31. The second exhaust valve 311 can be a one-way valve that only opens from the inside of the electrical compartment 3 to the outside. When nitrogen is introduced into the electrical compartment 3, the nitrogen can carry the gas in the electrical compartment 3 out of the electrical compartment 3 through the one-way valve, thereby reducing the amount of oxygen in the electrical compartment 3 and maintaining the air pressure balance in the electrical compartment 3. Of course, the second exhaust valve 311 can be another exhaust valve electrically connected to the controller of the nitrogen device. When the nitrogen device is delivering nitrogen to the electrical compartment 3, the controller controls the second exhaust valve 311 to open to exhaust the gas in the electrical compartment 3 and maintain the air pressure balance in the electrical compartment 3. When the nitrogen device is not delivering nitrogen to the electrical compartment 3, the controller controls the second exhaust valve 311 to close to prevent external air from entering the electrical compartment 3.

[0040] As an embodiment, as shown in Figure 4 and Figure 5 The gas delivery pipeline assembly 6 comprises a first pipeline 61 and a second pipeline 62. The nitrogen generating mechanism 5 communicates with the electrical compartment 3 through the first pipeline 61 to input nitrogen into the electrical compartment 3 through the first pipeline 61. The nitrogen generating mechanism 5 communicates with the battery compartment 2 through the second pipeline 62 to input nitrogen into the battery compartment 2 through the second pipeline 62. Among them, Figure 4 and Figure 5 The number of battery compartments 2 in

[0041] As an embodiment, as shown in Figure 5As shown, the battery compartment 2 is multiple, the second pipeline 62 includes a second main pipe 621 and multiple branch pipes 622, one branch pipe 622 corresponds to connect one battery compartment 2, multiple branch pipes 622 are all connected with one end of the second main pipe 621, the other end of the second main pipe 621 is connected with the nitrogen production mechanism 5. Specifically, the nitrogen produced by the nitrogen production mechanism 5 is first transported to the second main pipe 621, then into each branch pipe 622 connected with the second main pipe 621, and finally input into each battery compartment 2 by each branch pipe 622.

[0042] As an embodiment, as shown in Figure 5 As shown, the first pipeline 61 is provided with a first main electromagnetic valve 611, the second main pipe 621 is provided with a second main electromagnetic valve 623 near one side of the nitrogen production mechanism 5, and each branch pipe 622 is provided with a branch electromagnetic valve 624; the first main electromagnetic valve 611, the second main electromagnetic valve 623 and each branch electromagnetic valve 624 are electrically connected with the nitrogen device. Specifically, the opening and closing of each electromagnetic valve is controlled by the controller of the nitrogen device to transport nitrogen into the corresponding compartment; and each electromagnetic valve is independent of each other to ensure that each passage can independently transport nitrogen to each other.

[0043] As an embodiment, as shown in Figure 4 and Figure 5 As shown, the nitrogen production mechanism 5 includes an air compressor 51, a filter 52, a nitrogen generator 53 and a nitrogen storage bottle 54 connected in sequence, and the outlet end of the nitrogen storage bottle 54 is communicated with the gas pipeline assembly 6. Specifically, the outlet end of the air compressor 51 is connected with the inlet end of the filter 52, the outlet end of the filter 52 is connected with the inlet end of the nitrogen generator 53, the outlet end of the nitrogen generator 53 is connected with the inlet end of the nitrogen storage bottle 54, and the outlet end of the nitrogen storage bottle 54 is connected with the gas pipeline assembly 6; the outlet end of the nitrogen storage bottle 54 is provided with a third electromagnetic valve (not shown) electrically connected with the controller, and the third electromagnetic valve can be a three-way valve, two outlets of which are connected with the first pipeline 61 and the second pipeline 62 respectively. When producing nitrogen, the inlet end of the air compressor 51 is communicated with the outside air, the air compressor 51 pumps the compressed air into the filter 52, the impurities in the air are removed by the filter 52, then the air enters the nitrogen generator 53, the nitrogen is generated in the nitrogen generator 53, and the nitrogen is input into the nitrogen storage bottle 54 for storage. When the battery compartment 2 and / or the electrical compartment 3 needs to be input with nitrogen, the nitrogen device opens the third electromagnetic valve arranged on the outlet end of the nitrogen storage bottle 54, and simultaneously opens the corresponding electromagnetic valve on the first pipeline 61 and / or the second pipeline 62 to input nitrogen into the corresponding compartment. Among them, the nitrogen storage bottle 54 is provided with a pressure gauge (not shown), when the nitrogen pressure is less than the preset minimum value of the nitrogen pressure, the nitrogen production mechanism 5 starts to produce nitrogen to store in the nitrogen storage bottle 54 for standby; when the nitrogen pressure reaches the preset maximum value of the nitrogen pressure, the nitrogen production mechanism 5 stops producing nitrogen to avoid the pressure in the nitrogen storage bottle 54 being too large to cause the device to burst.

[0044] As an implementation form, as shown in Figures 1 to 3 The box body 1 is provided with an explosion-proof plate 7, and the top of the box body 1 is provided with an exhaust port 11 corresponding to the battery compartment 2. One explosion-proof plate 7 is installed at one exhaust port 11 and seals the exhaust port 11. Specifically, the top of one battery compartment 2 can be provided with one or more exhaust ports 11; when the battery compartment 2 is multiple, at least one exhaust port 11 is provided corresponding to each battery compartment 2, and each exhaust port 11 is installed with an explosion-proof plate 7; when thermal runaway occurs, the explosion-proof plate 7 can be broken to timely discharge the heat inside the container.

[0045] As an implementation form, the explosion-proof plate 7 includes a frame 71 and a weak part 72. The frame 71 is a hollow structure, and the weak part 72 is arranged in the frame 71. The frame 71 and the box body 1 are fixed by bolts 8, so as to be installed on the exhaust port 11. When thermal runaway occurs, the weak part 72 is broken, so as to timely discharge the heat generated by thermal runaway and avoid further aggravation of thermal runaway. The weak part 72 can be broken on one side, but cannot completely separate from the frame 71, so as to avoid the weak part 72 from flying out and injuring others after being broken.

[0046] As an implementation form, the battery compartment 2 and the electrical compartment 3 are both provided with an oxygen concentration sensor (not shown), and the oxygen concentration sensor is electrically connected with the nitrogen device. In this embodiment, the oxygen concentration in each battery compartment 2 and the electrical compartment 3 is detected by the oxygen concentration sensor, so as to control the opening and closing of each electromagnetic valve on the gas pipeline assembly 6, thereby selecting to supply nitrogen to the compartment body whose oxygen concentration rises to a preset value, controlling the nitrogen injection amount, achieving the purpose of reducing the oxygen concentration in the corresponding battery compartment 2 and / or electrical compartment 3, and realizing the low-oxygen effect.

[0047] As an implementation form, as shown in Figure 1 and Figure 2 The box body 1 is further provided with a liquid cooling compartment 9, and the liquid cooling compartment 9 is installed with a liquid cooling unit (not shown) for cooling each compartment body in the box body 1, so as to avoid the problem of fire caused by high temperature inside the box body 1.

[0048] As an implementation form, the internal pressure of the box body 1 is greater than the atmospheric pressure, and the difference between the internal pressure and the atmospheric pressure is A, wherein 5pa≤A≤1000pa. At this time, the inside of the box body 1 is in a micro-positive pressure state, so as to avoid the oxygen and water vapor in the outside from entering the box body 1, and improve the fireproof effect of the box body 1.

[0049] As an implementation, 5pa≤A≤500pa, or 5pa≤A≤200pa, or 5pa≤A≤100pa, or 10pa≤A≤200pa, or 5pa≤A≤50pa, or 5pa≤A≤20pa, when in the above range, that is, to ensure that the box 1 is in a micro-positive pressure state, and to avoid the nitrogen flow in the box 1 from being too fast due to the too large pressure difference.

[0050] The specific working process of the utility model is as follows:

[0051] The oxygen concentration sensor is arranged in each of the electrical compartment 3 and the battery compartment 2, and measures the oxygen concentration in the corresponding compartment and transmits the same to the nitrogen device; when each of the oxygen concentration sensors is in a normal range, each of the electromagnetic valves on the gas conveying pipeline assembly 6 is in a closed state; when the measured value of one or more of the oxygen concentration sensors is greater than the preset oxygen concentration value, the abnormal data is transmitted to the nitrogen device, the nitrogen device opens the third electromagnetic valve at the outlet end of the nitrogen storage bottle 54 and the electromagnetic valve on the pipeline corresponding to the abnormal compartment to realize the smoothness of the conveying pipeline, and nitrogen is conveyed into the compartment, the oxygen in the compartment is carried out of the compartment by the exhaust valve on the compartment, and when the oxygen concentration value in the compartment is normal, the electromagnetic valve on the conveying pipeline corresponding to the compartment is closed; when the oxygen concentration values of all the compartments are normal, the third electromagnetic valve on the nitrogen storage bottle 54 is finally closed.

[0052] For example, when the oxygen concentrations of the electrical compartment 3 and one of the battery compartments 2 are abnormal, the nitrogen device opens the third electromagnetic valve at the outlet end of the nitrogen storage bottle 54 and the first main electromagnetic valve 611 to input nitrogen into the electrical compartment 3 through the first pipeline 61, and simultaneously opens the second main electromagnetic valve 623 and the branch electromagnetic valve 624 corresponding to the abnormal battery compartment 2 to input nitrogen into the battery compartment 2 through the second main pipeline 621 and the branch pipeline 622 connected with the battery compartment 2; when the oxygen concentration of the electrical compartment 3 reaches the normal value first, the first main electromagnetic valve 611 is closed first; nitrogen continues to be input into the abnormal battery compartment 2, and when the oxygen concentration of the battery compartment 2 is normal, the branch electromagnetic valve 624, the second main electromagnetic valve 623 and the third electromagnetic valve at the outlet end of the nitrogen storage bottle 54 are closed.

[0053] The nitrogen device judges whether to produce nitrogen and store it in the nitrogen storage bottle 54 according to the measurement of the pressure gauge in the nitrogen storage bottle 54; when the nitrogen pressure is less than the preset minimum nitrogen pressure value, the nitrogen production mechanism 5 starts to produce nitrogen and store it in the nitrogen storage bottle 54 for standby; when the nitrogen pressure reaches the preset maximum nitrogen pressure value, the nitrogen production mechanism 5 stops producing nitrogen.

[0054] The utility model discloses a box 1 is independently arranged between each bin body, avoids the mutual spread and influences the bin body of adjacent when the heat runaway appears in a bin body, to reduce the loss, battery bin 2 and electrical bin 3 are all injected nitrogen, make battery bin 2 and electrical bin 3 all be in a low oxygen environment, improve the fireproof effect of energy storage system, avoid the mutual spread when the heat runaway occurs, improve the security of whole energy storage system.

[0055] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has disclosed as above with the preferred embodiment, however, is not used to limit the utility model, any person skilled in the art, without departing from the technical scheme range of the utility model, can make some changes or modification to the above disclosed technical content, equivalent embodiment of equivalent change, but as long as not departing from the technical scheme content of the utility model, according to the technical essence of the utility model, any simple modification, equivalent change and modification of the above embodiment, still belong to the protection scope of the technical scheme of the utility model.

Claims

1. An energy storage system comprising a box (1) in which a battery compartment (2) and an electrical compartment (3) are provided, characterized in that, The battery compartment (2) and the electrical compartment (3) are independently arranged, and the energy storage system further comprises a nitrogen device, the nitrogen device comprises a nitrogen generating mechanism (5) and a gas pipeline assembly (6), the nitrogen generating mechanism (5) injects nitrogen into the battery compartment (2) and the electrical compartment (3) through the gas pipeline assembly (6) respectively.

2. The energy storage system of claim 1, wherein, The battery compartment (2) is multiple, and the multiple battery compartments (2) are arranged along the length direction of the box (1), and the electrical compartment (3) is arranged on one side of the box (1) along the length direction.

3. The energy storage system of claim 1, wherein, The box (1) further comprises a nitrogen generating compartment (4), and the nitrogen device is arranged in the nitrogen generating compartment (4).

4. The energy storage system of claim 1, wherein, The battery compartment (2) comprises a first compartment door (21), the first compartment door (21) is used for sealing the battery compartment (2), and a first exhaust valve (211) is arranged on the first compartment door (21).

5. The energy storage system of claim 1, wherein, The electrical compartment (3) comprises a second compartment door (31), the second compartment door (31) is used for sealing the electrical compartment (3), and a second exhaust valve (311) is arranged on the second compartment door (31).

6. The energy storage system of claim 1, wherein, The gas pipeline assembly (6) comprises a first pipeline (61) and a second pipeline (62), the nitrogen generating mechanism (5) is communicated with the electrical compartment (3) through the first pipeline (61), and the nitrogen generating mechanism (5) is communicated with the battery compartment (2) through the second pipeline (62).

7. The energy storage system of claim 6, wherein, The battery compartment (2) is multiple, the second pipeline (62) comprises a second main pipeline (621) and multiple branch pipelines (622), one branch pipeline (622) is connected with one battery compartment (2), the multiple branch pipelines (622) are connected with one end of the second main pipeline (621), and the other end of the second main pipeline (621) is connected with the nitrogen generating mechanism (5).

8. The energy storage system of claim 7, wherein, A first main electromagnetic valve (611) is arranged on the first pipeline (61), a second main electromagnetic valve (623) is arranged on the second main pipeline (621), and the first main electromagnetic valve (611) and the second main electromagnetic valve (623) are electrically connected with the nitrogen device.

9. The energy storage system of claim 1, wherein, The nitrogen generating mechanism (5) comprises an air compressor (51), a filter (52), a nitrogen generator (53) and a nitrogen storage bottle (54) connected in sequence, and an outlet end of the nitrogen storage bottle (54) is communicated with the gas pipeline assembly (6).

10. The energy storage system of claim 1, wherein, An explosion-proof plate (7) is arranged on the box (1), exhaust ports (11) are arranged on the top of the box (1) and correspond to the positions of the battery compartments (2), one explosion-proof plate (7) is arranged on one exhaust port (11) and seals the exhaust port (11).

11. The energy storage system of claim 10, wherein, The explosion-proof plate (7) comprises a frame (71) and a weak part (72), the weak part (72) is arranged in the frame (71), and the frame (71) and the box (1) are fixed by bolts (8), so that the explosion-proof plate (7) is arranged on the exhaust port (11).

12. The energy storage system of claim 1, wherein, Oxygen concentration sensors are arranged in the battery compartment (2) and the electrical compartment (3), and the oxygen concentration sensors are electrically connected with the nitrogen device.

13. The energy storage system of claim 1, wherein, The internal pressure of the box (1) is greater than the atmospheric pressure, and the difference between the internal pressure and the atmospheric pressure is A, wherein 5pa≤A≤1000pa.

14. The energy storage system of claim 13, wherein the at least one energy storage device is a battery. 5pa≤A≤100pa.

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