Gas inerting device for battery compartment of energy storage power station

Abstract

The utility model relates to the technical field of battery pack safety technologies, in particular to a gas inerting device for a battery compartment of an energy storage power station. The utility model provides an energy storage power station battery compartment gas inerting device which comprises an energy storage container, the energy storage container comprises an equipment compartment and a battery compartment, the energy storage power station battery compartment gas inerting device further comprises a nitrogen replacement mechanism, the nitrogen replacement mechanism is arranged outside the energy storage container and can be communicated with the battery compartment, and an electric control valve is arranged between the nitrogen replacement mechanism and the battery compartment. The electric control valve is electrically connected with a controller; a pressure sensor and an oxygen sensor are arranged in the battery cabin and are electrically connected with a controller, and the controller is electrically connected with the nitrogen replacement mechanism; and the battery cabin is provided with a pressure relief valve capable of being opened or closed. According to the utility model, the battery pack is integrated in the battery cabin, and the battery cabin is filled with nitrogen to play a fireproof role.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack safety technology, in particular to a gas inerting device for a battery compartment of an energy storage power station. Background Art

[0002] According to incomplete statistics from CNESA, there have been more than 60 energy storage safety accidents in the world in the past decade. In 2021, the global energy storage market exploded, with more and more large-scale energy storage projects, and the scale of individual energy storage projects has become larger and larger, and the potential safety hazards of energy storage have also increased. As of August 2022, a total of 18 energy storage project accidents occurred worldwide in 2021-2022. Among them, safety accidents often occur in lithium-ion batteries. Once they occur, the accident level is usually high and the losses are heavy. Many accidents occurred many years after the power station was put into operation, and the safety issues of the entire life cycle of energy storage have attracted attention.

[0003] The safety issues of energy storage power stations cannot be ignored, but as a highly charged body, water spraying may cause short circuits in charged bodies and their lines, triggering fires or expanding electrical accidents. Therefore, in the early stage of a fire in an energy storage system, when a large number of energy storage batteries have not yet been affected, the use of water as a fire extinguishing medium should be carefully considered. At present, in the actual application of energy storage power stations, a gas fire extinguishing system is mainly set up, and a gas fire extinguishing agent storage tank is placed outside the power station, which is connected to the inside of the energy storage power station by pipelines. In the event of a fire, the gas fire extinguishing agent will erupt, but the dosage of the gas fire extinguishing agent is limited. Although this can achieve the effect of extinguishing the fire, the suppression function is limited.

[0004] Oxygen is one of the three elements of combustion. By introducing nitrogen into the battery compartment of the energy storage power station to reduce the internal oxygen concentration, the purpose of suppressing fire is achieved, so that the energy storage power station will not catch fire when thermal runaway occurs. There are also some devices for filling protective gas for battery packs in the prior art. However, since the energy storage power station is composed of a large number of battery packs, when the device for filling protective gas for battery packs is directly applied to the energy storage power station, the filling time is relatively long, which affects the effect of fire suppression. Another technical solution in the prior art is to use a nitrogen generator to continuously prepare high-concentration nitrogen, continuously purge the battery pack, and isolate oxygen to achieve the purpose of fire control. However, this technical solution requires continuous preparation of high-concentration nitrogen, which is costly and has high requirements for nitrogen production equipment. Utility Model Content

[0005] In view of the technical problems in the prior art that the fire prevention cost of energy storage power stations is high and the protection effect is poor, the utility model provides a gas inerting device for a battery compartment of an energy storage power station, which integrates a battery pack into the battery compartment and fills the battery compartment with nitrogen to play a fire prevention role.

[0006] The utility model provides a gas inerting device for a battery compartment of an energy storage power station, comprising an energy storage container, wherein the energy storage container comprises an equipment compartment for placing equipment and a battery compartment for placing batteries, the inerting device further comprises a nitrogen replacement mechanism, the nitrogen replacement mechanism is arranged outside the energy storage container and can be communicated with the battery compartment, an electric control valve is arranged between the nitrogen replacement mechanism and the battery compartment, and the electric control valve is electrically connected to a controller; a pressure sensor and an oxygen sensor are arranged in the battery compartment, the pressure sensor and the oxygen sensor are electrically connected to the controller, and the controller is electrically connected to the nitrogen replacement mechanism; a pressure relief port is arranged in the battery compartment, and the pressure relief port is provided with a pressure relief valve that can be opened or closed.

[0007] Furthermore, the nitrogen replacement mechanism includes a nitrogen storage tank, which is connected to the battery compartment through the electric control valve, the nitrogen storage tank is connected to a nitrogen generator, the nitrogen generator is connected to a cold dryer, the cold dryer is connected to an air storage tank, and the air storage tank is connected to an air compressor.

[0008] Furthermore, the nitrogen gas storage tank is provided with a pressure gauge for detecting the internal pressure of the nitrogen gas storage tank.

[0009] Furthermore, the controller is arranged in the equipment cabin.

[0010] Furthermore, the pressure sensor and the oxygen sensor are arranged on the top of the battery compartment.

[0011] Furthermore, the pressure relief valve includes a valve plate, an elastic member and a fixed plate, one end of the elastic member is connected to the valve plate, and the other end of the elastic member is connected to the fixed plate. When the pressure in the battery compartment is too high, the gas in the battery compartment pushes the valve plate open, and the gas in the battery compartment flows from the pressure relief valve to the outside of the battery compartment. The pressure threshold in the battery compartment can be selected by selecting an elastic member with appropriate parameters. When the pressure value in the battery compartment is high enough to overcome the resistance of the elastic member and the valve plate, the valve plate is pushed open, and the gas in the battery compartment can flow to the outside of the battery compartment, thereby realizing automatic control of the pressure in the battery compartment.

[0012] The beneficial effects of the utility model are:

[0013] The battery pack is integrated in the battery compartment, and the environment inside the battery compartment is filled with nitrogen through a nitrogen replacement mechanism. An oxygen sensor and a pressure sensor are installed in the battery compartment. When the air pressure in the battery compartment is high, the pressure relief valve opens. When the air pressure in the battery compartment is low, nitrogen is filled in to maintain an inerting environment with high concentration of nitrogen in the battery compartment, while maintaining the pressure balance inside and outside the battery compartment. In addition, the oxygen sensor monitors the oxygen concentration in the battery compartment. When the oxygen concentration is high, nitrogen is filled into the battery compartment again, and the pressure balance inside and outside is maintained through the pressure relief valve.

[0014] By selecting an elastic member with appropriate parameters, the pressure threshold in the battery compartment can be selected. When the pressure value in the battery compartment is high enough to overcome the resistance of the elastic member and the valve plate, the valve plate is pushed open and the gas in the battery compartment can flow out of the battery compartment, thereby realizing automatic control of the pressure in the battery compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0017] Figure 2 It is a structural schematic diagram of an embodiment of the utility model.

[0018] Among them, 1-battery compartment, 2-equipment compartment, 3-pressure relief port, 4-nitrogen replacement mechanism, 5-pressure sensor, 6-oxygen sensor, 7-controller, 8-electrically controlled valve, 9-pipeline, 10-air compressor, 11-air storage tank, 12-cold dryer, 13-nitrogen generator, 14-nitrogen storage tank. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] like Figure 1 As shown, an embodiment of the utility model provides a gas inerting device for a battery compartment 1 of an energy storage power station, including an energy storage container, the energy storage container including an equipment compartment 2 for placing equipment and a battery compartment 1 for placing batteries, energy supply equipment such as battery packs are integrated in the battery compartment 1, the environment of the battery compartment 1 is uniformly monitored, nitrogen is filled into the battery compartment 1 through a nitrogen replacement mechanism 4, and an inert environment with a high nitrogen concentration is formed in the battery compartment to prevent the occurrence of fire.

[0021] The inerting device also includes a nitrogen replacement mechanism 4, which is arranged outside the energy storage container and can be connected to the battery compartment 1. A through hole is arranged on the wall of the battery compartment 1. The nitrogen replacement mechanism 4 inserts the pipe 9 into the through hole, and the prepared nitrogen is input into the battery compartment 1 from the pipe 9. The pipe 9 and the through hole are sealed and connected by filling sealing material.

[0022] In the embodiment of the utility model, a person skilled in the art can select a suitable controller 7 to be electrically connected to the electric control valve 8 or the pressure sensor 5 or the oxygen sensor 6 or the nitrogen replacement mechanism. In one embodiment of the utility model, the controller 7 adopts a fire alarm controller, and the fire alarm controller is electrically connected to the electric control valve 8 or the pressure sensor 5 or the oxygen sensor 6 or the nitrogen replacement mechanism, so as to realize the reading of the monitoring data of the pressure sensor 5 or the oxygen sensor 6 and the switch of the electric control valve 8 or the oxygen sensor 6. In the embodiment of the utility model, an electric control valve 8 is arranged between the nitrogen replacement mechanism 4 and the battery compartment 1, and the electric control valve 8 is electrically connected to the controller 7; a pressure sensor 5 and an oxygen sensor 6 are arranged in the battery compartment 1, and the pressure sensor 5 and the oxygen sensor 6 are electrically connected to the controller 7, and the controller 7 is electrically connected to the nitrogen replacement mechanism 4; a pressure relief port 3 is arranged in the battery compartment 1, and the pressure relief port 3 is arranged with a pressure relief valve that can be opened or closed. In one embodiment, the pressure relief port 3 is arranged with an electromagnetic pressure relief valve, and the electromagnetic pressure relief valve is electrically connected to the fire alarm controller. The pressure sensor 5 monitors the gas pressure in the battery compartment 1. The signal of the pressure sensor 5 is converted and transmitted to the fire alarm controller through an analog-to-digital converter. When the pressure in the battery compartment 1 exceeds the set maximum pressure threshold, the fire alarm controller opens the electromagnetic pressure relief valve, and the gas in the battery compartment 1 flows to the outside, and the pressure in the battery compartment 1 is reduced, so as to maintain the pressure balance inside and outside the battery compartment 1. In one embodiment, the pressure relief port 3 is provided with pressure relief valves, which include a valve plate, a spring and a fixed plate. One end of the spring is hingedly connected to the valve plate, and the other end of the spring is hingedly connected to the fixed plate. When the pressure value in the battery compartment 1 is high enough to overcome the resistance of the spring and the valve plate, the valve plate is pushed open, and the gas in the battery compartment 1 can flow to the outside of the battery compartment 1, thereby realizing the automatic control of the pressure in the battery compartment 1. The pressure relief valve of this embodiment does not need to be electrically controlled. The technicians in this field can realize the automatic opening and closing of the pressure relief valve by selecting valve plates and springs of suitable materials and specifications according to the parameters, which is quick to respond and has low maintenance cost.

[0023] When the pressure in the battery compartment 1 is lower than the set minimum pressure threshold, the controller 7 opens the electric control valve 8, opens the nitrogen replacement mechanism 4, fills nitrogen into the battery compartment 1, and opens the electromagnetic pressure relief valve to maintain the balance of internal and external pressures. The oxygen sensor 6 monitors the oxygen concentration in the battery compartment 1, and the signal of the oxygen sensor 6 is converted and transmitted to the controller 7 through the analog-to-digital converter. When the oxygen concentration in the battery compartment 1 is higher than the set maximum threshold, the controller 7 opens the electric control valve 8, opens the nitrogen replacement mechanism 4, fills nitrogen into the battery compartment 1, and opens the electromagnetic pressure relief valve to maintain the balance of internal and external pressures. In one embodiment of the utility model, the pressure sensor 5 and the oxygen sensor 6 are arranged on the top of the battery compartment 1, and the controller 7 is arranged in the equipment compartment 2.

[0024] like Figure 2 As shown, in one embodiment of the utility model, the nitrogen replacement mechanism 4 includes a nitrogen gas storage tank 14, the nitrogen gas storage tank 14 is connected to the battery compartment 1 through the electric control valve 8, the nitrogen gas storage tank 14 is connected to the nitrogen generator 13 through the pipeline 9, the nitrogen generator 13 is connected to the cold dryer 12 through the pipeline 9, the cold dryer 12 is connected to the air gas storage tank 11 through the pipeline 9, and the air gas storage tank 11 is connected to the air compressor 10 through the pipeline 9. In one embodiment, the nitrogen gas storage tank 14 is provided with a pressure gauge to monitor the pressure in the nitrogen gas storage tank 14. When the pressure in the nitrogen gas storage tank 14 is low, the nitrogen generator 13 is turned on, nitrogen is filled into the nitrogen gas storage tank 14, and the electric control valve 8 is opened, and the nitrogen in the nitrogen gas storage tank 14 can be filled into the battery compartment 1. In one embodiment, the electric control valve 8 is opened, the nitrogen generator 13 is turned on, and the nitrogen generated by the nitrogen generator 13 enters the battery compartment 1 through the nitrogen gas storage tank 14 and the channel.

[0025] Although the present invention is described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field may easily think of changes or substitutions within the technical scope disclosed in the present invention, and these shall be within the scope of protection of the present invention.

Claims

1. A gas inerting device for a battery compartment of an energy storage power station, comprising an energy storage container, characterized in that: The energy storage container includes an equipment compartment for placing equipment and a battery compartment for placing batteries. The inerting device also includes a nitrogen replacement mechanism, which is arranged outside the energy storage container and can be communicated with the battery compartment. An electric control valve is arranged between the nitrogen replacement mechanism and the battery compartment, and the electric control valve is electrically connected to a controller. A pressure sensor and an oxygen sensor are provided in the battery compartment, the pressure sensor and the oxygen sensor are electrically connected to a controller, and the controller is electrically connected to the nitrogen replacement mechanism; The battery compartment is provided with a pressure relief valve that can be opened and closed.

2. A gas inerting device for a battery compartment of an energy storage power station as claimed in claim 1, characterized in that: The nitrogen replacement mechanism includes a nitrogen storage tank, which is connected to the battery compartment through the electric control valve, the nitrogen storage tank is connected to a nitrogen generator, the nitrogen generator is connected to a cold dryer, the cold dryer is connected to an air storage tank, and the air storage tank is connected to an air compressor.

3. A gas inerting device for a battery compartment of an energy storage power station as claimed in claim 2, characterized in that: The nitrogen gas storage tank is provided with a pressure gauge for detecting the internal pressure of the nitrogen gas storage tank.

4. A gas inerting device for a battery compartment of an energy storage power station as claimed in claim 1, characterized in that: The controller is arranged in the equipment cabin.

5. A gas inerting device for a battery compartment of an energy storage power station as claimed in claim 1, characterized in that: The pressure sensor and the oxygen sensor are arranged on the top of the battery compartment.

6. A gas inerting device for a battery compartment of an energy storage power station as claimed in claim 1, characterized in that: The pressure relief valve comprises a valve plate, an elastic member and a fixing plate, one end of the elastic member is connected to the valve plate, and the other end of the elastic member is connected to the fixing plate.

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