A battery energy storage system

Abstract

This application provides a battery energy storage system, including electrical equipment and a fire protection system. The electrical equipment includes multiple battery boxes, a high-voltage box, and a DC cabinet. The fire protection system includes a controller, a variable frequency pump, and multiple main pipelines for providing fire extinguishing agents. Each main pipeline is equipped with a solenoid valve and multiple branch pipelines. Each branch pipeline is connected to a nozzle for spraying fire extinguishing agents. The multiple branch pipelines corresponding to each main pipeline are all connected to the same type of electrical equipment. The controller is used to receive fire information sent by the electrical equipment. The fire information includes fire warning information, fire extinguishing progress information, and fire extinguishing information. Based on the fire information sent by the electrical equipment, the controller controls the opening / closing of the variable frequency pump, the opening / closing and opening degree of the solenoid valve on the main pipeline, and the opening / closing of the branch pipelines on the main pipeline, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs, thereby improving fire extinguishing efficiency.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a battery energy storage system. Background Technology

[0002] A battery energy storage system includes multiple battery boxes, electrical equipment such as multiple high-voltage boxes and DC cabinets, and a fire protection system. Existing fire protection systems for energy storage systems fall into two categories: one only provides fire suppression for the battery boxes, neglecting the fire protection needs arising from potential fires in the high-voltage boxes and DC cabinets; the other provides separate fire protection systems for each battery box, high-voltage box, and DC cabinet, consisting of fire extinguishing agents and fire-fighting pipelines. If only one fire protection system is provided for the battery boxes, fires in the high-voltage boxes or DC cabinets cannot be detected and extinguished promptly. If separate fire protection systems are provided for each battery box, high-voltage box, and DC cabinet, the fire protection system of the entire energy storage system becomes overly complex and has low utilization. Summary of the Invention

[0003] The purpose of this application is to provide a battery energy storage system, including multiple battery boxes, high-voltage boxes, DC cabinets, and a fire protection system, which can meet the fire protection needs of different electrical equipment under multiple main pipelines and improve fire protection efficiency.

[0004] In a first aspect, this application provides a battery energy storage system, including electrical equipment and a fire protection system. The electrical equipment includes multiple battery boxes, a high-voltage box and a DC cabinet. The fire protection system includes a controller, a variable frequency pump and multiple main pipelines for providing fire extinguishing agent. Each main pipeline is equipped with a solenoid valve and multiple branch pipelines. Each branch pipeline is connected to a nozzle for spraying fire extinguishing agent. The multiple branch pipelines corresponding to each main pipeline are all connected to the same type of electrical equipment.

[0005] In a preferred embodiment of this application, each of the aforementioned electrical devices is equipped with a fire sensing device, which includes a temperature detection device and a fire detection device. The fire detection device includes an aerosol system or a thermal wire. The electrical devices are used to detect the internal temperature of the electrical devices via the temperature detection device and to detect the fire situation via the fire detection device. If the internal temperature of the electrical devices is higher than a preset temperature threshold, but the fire detection device detects no fire, the relays and circuit breakers connected to the electrical devices are controlled to disconnect. If the internal temperature of the electrical devices is higher than the preset temperature threshold and the fire detection device detects a fire, a fire warning message is sent to the controller. During the fire extinguishing process, each electrical device corresponding to a fire point, after detecting that the internal temperature of the device remains at a normal value through its built-in temperature sensor, sends a fire extinguishing message to the controller so that the controller can determine that the electrical device that has been extinguished is detected. If the temperature sensor fails at high temperatures, infrared thermography is used to determine whether the fire has been completely extinguished. After confirming that the fire has been completely extinguished, the solenoid valve on the corresponding main pipeline is closed by manual control.

[0006] In a preferred embodiment of this application, the controller in the above-mentioned fire protection system can perform the following two steps: (1) receiving fire information sent by electrical equipment; the fire information includes fire warning information, fire extinguishing progress information and fire extinguishing information; (2) according to the fire information sent by electrical equipment, controlling the opening / closing of the variable frequency pump, controlling the opening / closing and opening degree of the solenoid valve of the main pipeline, and controlling the opening / closing of the branch pipeline on the main pipeline, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs.

[0007] In a preferred embodiment of this application, the controller is further configured to: upon receiving a fire warning message from a first electrical device on at least one first branch pipe in the first main pipeline, control the opening of the first solenoid valve corresponding to the first main pipeline, control the opening of the first branch pipe, and control the rotation of the variable frequency pump so that the extinguishing agent reaches the first electrical device through the first main pipeline and the first branch pipe to extinguish the fire through the nozzle.

[0008] In a preferred embodiment of this application, each of the above-mentioned branch pipes is equipped with a flow detection device. After the step of ensuring that the extinguishing agent reaches the first electrical equipment through the first main pipe and the first branch pipe to extinguish the fire through the nozzle, the controller can also perform the following steps: during the fire extinguishing process, the flow detection device is used to obtain the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location, and it is determined whether it exceeds the corresponding rated flow rate. If yes, the variable frequency pump speed is kept constant; if no, the variable frequency pump speed is increased until the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate.

[0009] In a preferred embodiment of this application, the controller is further configured to perform the following steps: if the first electrical equipment corresponding to the ignition point includes multiple devices, the variable frequency pump speed is kept constant after detecting that the first electrical equipment has been extinguished; if the first electrical equipment corresponding to all ignition points has been extinguished, the variable frequency pump is shut off, the first solenoid valve corresponding to the first main pipeline is shut off, and the first branch pipeline corresponding to the first electrical equipment is shut off.

[0010] In a preferred embodiment of this application, the controller is further configured to perform the following steps: during fire extinguishing, if a fire warning message is received from a second electrical device on at least one second branch pipe in the second main pipeline, after detecting that the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate, the controller increases the speed of the variable frequency pump and opens the solenoid valve corresponding to the second main pipeline, and opens the second branch pipe; the controller detects the extinguishing agent flow rate of the second branch pipe corresponding to the fire point farthest from the extinguishing agent location and gradually increases the opening degree of the second solenoid valve. If the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location is not detected to exceed the corresponding rated flow rate, the increase of the opening of the second solenoid valve is paused, and the speed of the variable frequency pump is continued to increase to increase the total extinguishing agent flow rate until the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location does not exceed the corresponding rated flow rate. Then, the opening of the second solenoid valve is increased again until the flow rates of the first main pipe and the second main pipe are stable. The opening of the first solenoid valve and the second solenoid valve, as well as the speed of the variable frequency pump, are kept constant, and the stable extinguishing state is entered.

[0011] In a preferred embodiment of this application, after the controller performs the step of entering a stable fire extinguishing state, it is further configured to perform the following steps: when it is detected that one or more ignition points on the first target main pipeline have been extinguished, the speed of the variable frequency pump remains unchanged, and the opening degree of the solenoid valve of the first target main pipeline remains unchanged, so as to maintain the flow rate of the first target main pipeline remains unchanged; the first target main pipeline is either the first main pipeline or the second main pipeline.

[0012] In a preferred embodiment of this application, the controller is further configured to perform the following steps: if it is detected that all ignition points in the first target main pipeline have been extinguished, the solenoid valve of the first target main pipeline is closed, and the speed of the variable frequency pump is gradually reduced to reduce the total flow rate of the extinguishing agent; for the second target main pipeline, the opening of its solenoid valve is kept constant, and the extinguishing agent flow rate of the branch pipeline furthest away in the second target main pipeline is continuously detected and ensured to reach the rated flow rate.

[0013] In a preferred embodiment of this application, the above control further includes: an information receiving module for receiving fire information sent by electrical equipment; the fire information includes fire warning information, fire extinguishing progress information, and fire extinguishing information; and a fire extinguishing control module for controlling the opening / closing of the variable frequency pump, controlling the opening / closing and opening degree of the solenoid valve of the main pipeline, and controlling the opening / closing of the branch pipeline on the main pipeline, based on the fire information sent by the electrical equipment, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs.

[0014] The battery energy storage system provided in this application includes electrical equipment and a fire protection system. The electrical equipment includes multiple high-voltage boxes, battery boxes and DC cabinets. The fire protection system includes a controller, a variable frequency pump and multiple main pipelines for providing fire extinguishing agents. Each main pipeline is equipped with a solenoid valve and multiple branch pipelines. Each branch pipeline is connected to a nozzle for spraying fire extinguishing agents. The multiple branch pipelines corresponding to each main pipeline are all connected to the same type of electrical equipment. The controller can perform the following steps: (1) receive fire information sent by the electrical equipment. The fire information includes fire warning information, fire extinguishing progress information and fire extinguishing information. (2) according to the fire information sent by the electrical equipment, control the opening / closing of the variable frequency pump, control the opening / closing and opening degree of the solenoid valve of the main pipeline, and control the opening / closing of the branch pipelines on the main pipeline, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs. In this fire-fighting method executed by the controller, the fire-fighting needs of different electrical equipment under one or more main pipelines can be met by setting up multiple main pipelines and multiple branch pipelines under each main pipeline, as well as setting up variable frequency pumps and solenoid valves. The controller can flexibly control the hardware according to the fire-fighting situation, such as the on / off of variable frequency pumps, the on / off and opening degree of solenoid valves, and the on / off of branch pipelines. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a battery energy storage system provided in an embodiment of this application;

[0017] Figure 2 A flowchart of the controller execution steps in a battery energy storage system is provided as an embodiment of this application;

[0018] Figure 3 A flowchart of controller execution steps in another battery energy storage system provided in this application embodiment;

[0019] Figure 4 This is a structural block diagram of a controller in a battery energy storage system provided in an embodiment of this application. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Currently, the fire protection devices of energy storage systems either only extinguish fires in the battery box without considering the fire protection needs of electrical equipment such as high-voltage boxes and DC cabinets, so that when a fire occurs in electrical equipment such as high-voltage boxes or DC cabinets, the fire cannot be detected and extinguished in time; or they set up a fire protection system consisting of fire extinguishing agents and fire pipes for each battery box, as well as electrical equipment such as high-voltage boxes and DC cabinets. The fire protection devices of the entire energy storage system are too complex and have low utilization rate.

[0022] Based on this, this application provides a battery energy storage system that can achieve the fire protection needs of different electrical equipment under one or more main pipelines by setting up multiple main pipelines and multiple branch pipelines under each main pipeline, as well as setting up variable frequency pumps and solenoid valves. The system can be flexibly controlled by a controller according to the fire extinguishing situation, such as the on / off of variable frequency pumps, the on / off and opening degree of solenoid valves, and the on / off of branch pipelines, thereby improving fire protection efficiency.

[0023] To facilitate understanding of this solution, the system structure will be described first.

[0024] Figure 1 This is a schematic diagram of a battery energy storage system provided in an embodiment of this application. The system includes electrical equipment and a fire protection system. The electrical equipment includes multiple high-voltage boxes, battery boxes, and DC cabinets. The fire protection system includes a controller (not shown in the figure), a variable frequency pump 11, and multiple main pipelines 12 for providing fire extinguishing agents. Each main pipeline 12 is equipped with a solenoid valve 13 and multiple branch pipelines 14. Each branch pipeline 14 is connected to a nozzle (not shown in the figure) for spraying fire extinguishing agents. The multiple branch pipelines 14 corresponding to each main pipeline 12 are all connected to the same type of electrical equipment 15. Only one main pipeline is shown in the figure; the other two main pipelines are the same. The electrical equipment 15 includes a high-voltage box, a battery box, or a DC cabinet, that is, it includes three fire protection subsystems corresponding to the three main pipelines, namely a high-voltage box fire protection subsystem, a battery box fire protection subsystem, or a DC cabinet fire protection subsystem.

[0025] The electrical equipment 15 in the aforementioned battery energy storage system is used to send fire information to the controller, including fire warning information, fire extinguishing progress information, and fire extinguishing information. The controller is used to control the opening / closing of the variable frequency pump 11, the opening / closing and opening degree of the solenoid valve 13 of the main pipeline 12, and the opening / closing of the branch pipeline 14 on the main pipeline 12, based on the fire information sent by the electrical equipment, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs.

[0026] For example, when one or more main pipelines require fire suppression simultaneously, the controller can control the speed of the variable frequency pump based on fire warning information for each main pipeline, control the opening of the solenoid valves on the corresponding main pipelines of the electrical equipment, and control the opening of the corresponding branch pipelines on the main pipelines, so that the extinguishing agent can enter the electrical equipment through the main pipelines and branch pipelines to extinguish the fire; and control the speed of the variable frequency pump and the opening degree of the corresponding solenoid valves based on the progress of the fire suppression, until the fire suppression information is received, then control the variable frequency pump to shut down, control the solenoid valves on the corresponding main pipelines to close, and control the corresponding branch pipelines to close.

[0027] In addition, when extinguishing fires on electrical equipment under a main pipeline, if a new fire extinguishing request is received under a new main pipeline, the fire extinguishing mode can be adjusted to take into account the fire extinguishing needs under multiple main pipelines and achieve efficient fire extinguishing.

[0028] In this system, each of the aforementioned electrical devices is equipped with a fire detection device, which includes a temperature detection device and a fire detection device. The fire detection device includes an aerosol system or a thermal wire. The electrical devices are used to detect the internal temperature of the electrical devices via the temperature detection device and to detect the fire situation via the fire detection device. If the internal temperature of the electrical devices is higher than a preset temperature threshold, but the fire detection device detects no fire, the relays and circuit breakers connected to the electrical devices are controlled to disconnect. If the internal temperature of the electrical devices is higher than the preset temperature threshold and the fire detection device detects a fire, a fire warning message is sent to the controller.

[0029] For each battery box, a fire-fighting sensor is installed inside, including a temperature sensor and an aerosol system. If the internal temperature of the battery box is detected to be too high, but the aerosol system has not sprayed, it means that the internal temperature of the battery box is high but no fire has started, and the relay and circuit breaker will disconnect. If the temperature is detected to be too high and the aerosol system has sprayed, it means that the battery box has started a fire, and the fire warning information will be transmitted to the controller, so that the controller opens the main pipeline solenoid valve corresponding to the battery box and opens the branch pipeline switch corresponding to the fire point. The branch pipeline nozzle sprays fire extinguishing agent to extinguish the fire.

[0030] For high-voltage boxes and DC cabinets, each high-voltage box / DC cabinet is equipped with a fire-fighting sensing device, including a temperature sensor and a thermal wire. If the internal temperature is detected to be too high and the thermal wire is not disconnected, it means that the internal temperature of the high-voltage box / DC cabinet is high but no fire has started, and the relay and circuit breaker will disconnect. If the temperature is detected to be too high and the thermal wire has been disconnected, it means that the high-voltage box / DC cabinet has started a fire, and the fire warning information will be transmitted to the controller, so that the controller controls the opening of the main pipeline solenoid valve corresponding to the high-voltage box or DC cabinet and the opening of the branch pipe switch corresponding to the fire point. The branch nozzle will then spray fire extinguishing agent to extinguish the fire.

[0031] During the firefighting process, each electrical device corresponding to the ignition point sends a fire extinguishing message to the controller after the built-in temperature sensor detects that the temperature inside the device has remained at a normal value, so that the controller can confirm that the electrical device that has been extinguished has been detected. If the temperature sensor fails at high temperature, infrared temperature measurement is used to determine whether the fire has been completely extinguished. After confirming that the fire has been completely extinguished, the solenoid valve on the corresponding main pipeline is closed by manual control.

[0032] This fire protection system can achieve the fire protection needs of different electrical equipment under one or more main pipelines by setting up multiple main pipelines and multiple branch pipelines under each main pipeline, as well as setting up variable frequency pumps and solenoid valves. The controller can flexibly control the hardware according to the fire extinguishing situation, such as the on / off of variable frequency pumps, the on / off and opening degree of solenoid valves, and the on / off of branch pipelines.

[0033] Based on the above system embodiments, this application also provides a battery energy storage system, in which the controller can perform the following: Figure 2 The steps shown are as follows:

[0034] Step S202: Receive fire information sent by electrical equipment; fire information includes fire warning information, fire extinguishing progress information, and fire extinguishing information; fire warning information is a signal detected by the electrical equipment through its built-in fire sensor indicating a fire inside the equipment. Fire extinguishing progress information includes extinguishing agent flow detection information, and whether new fire warning information from the main pipeline has been received, etc.

[0035] Step S204: Based on the fire information sent by the electrical equipment, control the opening / closing of the variable frequency pump, control the opening / closing and opening degree of the solenoid valve of the main pipeline, and control the opening / closing of the branch pipeline on the main pipeline, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs.

[0036] The specific implementation process of this step is as follows, see below. Figure 3 As shown:

[0037] Step S302: After receiving a fire warning message from a first electrical device on at least one first branch pipe in the first main pipeline, control the first solenoid valve corresponding to the first main pipeline to open, control the first branch pipe to open, and control the variable frequency pump to rotate so that the extinguishing agent can reach the first electrical device through the first main pipeline and the first branch pipe to extinguish the fire through the nozzle.

[0038] Step S304: Each of the above-mentioned branch pipes is equipped with a flow detection device; during the fire extinguishing process, the flow detection device is used to obtain the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location, and to determine whether it exceeds the corresponding rated flow rate; if yes, the variable frequency pump speed is kept constant; if no, the variable frequency pump speed is increased until the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate.

[0039] It should be noted that each branch of the three main pipelines has its rated flow rate: for the battery box, high voltage box, and DC cabinet, due to their different internal structures, the required flow rate of the extinguishing agent will also be different in the event of a fire. Therefore, in order to achieve the purpose of fire extinguishing, each branch of the battery box, high voltage box, and DC cabinet has its own minimum flow rate value, which is called the rated flow rate.

[0040] Because the supply location of perfluorohexanone extinguishing agent in a fire extinguishing system is fixed, and the entire fire protection system includes multiple battery boxes / high-voltage boxes / DC cabinets, the flow loss of the extinguishing agent as it flows through various branch pipes in the main pipeline needs to be considered. The following explanation uses multiple battery boxes in the system as an example.

[0041] For multiple battery boxes in the system, a single main pipeline is shared. Fire extinguishing agents are supplied to the burning battery box via branch pipelines branching off from this main pipeline. The further the battery box is from the perfluorohexanone (PFH) fire extinguishing agent, the greater the flow loss of the fire extinguishing agent as it travels to its corresponding branch pipeline, resulting in a smaller flow rate reaching that branch pipeline. Therefore, when a battery box in the energy storage system catches fire, the main pipeline opens, and the fire extinguishing agent flows from the main pipeline to the branch pipeline corresponding to the fire point. It is also necessary to monitor the flow rate of the fire extinguishing agent in that branch pipeline to determine if it reaches its rated flow rate and is sufficient to meet the fire extinguishing requirements. Therefore, a flow meter is installed in each branch pipeline.

[0042] When a fire occurs in the battery boxes corresponding to multiple branch pipes on a main pipeline in the system, the flow rate of the branch pipe corresponding to the fire point farthest from the extinguishing agent location is detected. If the flow rate of the branch pipe at the farthest fire point can reach the rated flow rate value of the branch pipe, then the flow rate of the extinguishing agent in the branch pipes of other fire points that are relatively close to the perfluorohexanone extinguishing agent location can also reach the rated flow rate value.

[0043] Similarly, the flow detection of each branch line on the main pipeline of the high-voltage box and DC cabinet is similar to that of the battery box.

[0044] Step S306: If there are multiple first electrical devices corresponding to the ignition point, the variable frequency pump speed is kept constant after the first electrical device that has been extinguished is detected; if the first electrical devices corresponding to all ignition points are detected to be extinguished, the variable frequency pump is turned off, the first solenoid valve corresponding to the first main pipeline is turned off, and the first branch pipeline corresponding to the first electrical device is turned off.

[0045] During the fire extinguishing process, the detection method for fire extinguishing completion is as follows: For each electrical device corresponding to the ignition point, after the built-in temperature sensor detects that the temperature inside the device has been maintained at a normal value, it sends a fire extinguishing message to the controller so that the controller can determine that the electrical device that has been extinguished has been detected; if the temperature sensor fails at high temperature, infrared temperature measurement is used to determine whether the fire has been completely extinguished. After confirming that the fire has been completely extinguished, the solenoid valve on the corresponding main pipeline is closed by manual control.

[0046] Since the fire in the lithium iron phosphate batteries inside the battery box is a chemical reaction, this type of fire can only be extinguished by continuously cooling it with extinguishing agents until the chemical reaction ends. During the design phase, flame-retardant and fire-resistant materials can be used to ensure that the temperature detection device and signal lines can withstand high temperatures without damage. When the temperature detection device inside the battery box detects that the temperature has been maintained at a normal value, it sends a fire extinguishing message to the controller. Upon receiving this message, the controller automatically closes the solenoid valve. If the temperature detection and signal lines fail at high temperatures, infrared thermography can be used to determine whether the fire has been completely extinguished, and then the solenoid valves on the entire fire-fighting pipeline can be closed manually.

[0047] The first electrical device described above uses the battery box as an example. If the fire in the battery box is detected to have been extinguished, the switch for that branch line is closed, and the nozzles in that branch line will no longer spray extinguishing agent. If there are multiple ignition points in that branch line, the solenoid valve of the main battery box line is closed when all ignition points are extinguished. The same principle applies to extinguishing fires in the high-voltage box / DC cabinet as to the fire detection in the battery box, and will not be repeated here.

[0048] The aforementioned fire-fighting system is equipped with a controller to detect which of the three main fire lines has a triggering requirement and then controls that main line to open. Depending on whether the fire originates from the same main line or multiple different main lines, the system can switch between single-line and multiple-line operation modes.

[0049] The above describes the situation where only one main circuit experiences a fire alarm. That is, if only one main circuit in the system, which corresponds to the battery box, high voltage box, and DC cabinet, experiences a fire alarm, then the single main circuit working mode will be activated.

[0050] The working mode of a single supervisor's route is summarized as follows:

[0051] Each battery box, high-voltage box, and DC cabinet is equipped with a fire sensor to detect the occurrence of a fire and communicate with the controller to issue commands to open the corresponding main and branch pipes for fire suppression. Once the fire is extinguished, information is transmitted to the controller to close the corresponding branch pipe. If all fire points on the main pipe have been extinguished, the solenoid valve of the main pipe is closed, and the main pipe is then inoperable.

[0052] Battery Box Piping Operation Mode: When one or more battery boxes in the energy storage system catch fire, the main battery box pipeline is activated. The corresponding solenoid valve on this main pipeline fully opens, opening the main fire extinguishing pipeline. The extinguishing agent flows through the main battery box pipeline into the branch pipeline corresponding to the fire point to extinguish the fire. Simultaneously, the control circuit determines whether the flow rate of the straight pipeline corresponding to the fire point farthest from the perfluorohexanone extinguishing agent storage location reaches the rated flow rate value of the corresponding battery box branch pipeline. If it does, the variable frequency pump power remains constant; if not, the pump speed is increased to ensure that the flow rate of the farthest straight pipeline reaches the rated flow rate value of the battery box fire extinguishing system, and then the variable frequency pump flow rate remains constant.

[0053] If multiple fires occur in the battery box, during the firefighting process, when it is detected that a fire has been extinguished, the speed of the variable frequency pump remains unchanged, and the flow rate is distributed to the branch pipes that are still being extinguished, so as to increase the flow rate of the branch pipes and extinguish the fire as soon as possible.

[0054] Once all fire points in the battery boxes have been extinguished, turn off the variable frequency pump to stop supplying extinguishing agent and close the solenoid valve on the main pipeline.

[0055] High-voltage box piping operation mode: Same as battery box piping operation mode.

[0056] DC cabinet piping operating mode: Same as battery box piping operating mode.

[0057] The following describes the process of switching from a single main pipeline operating mode to a multiple main pipeline operating mode:

[0058] When one main pipeline in the system is already operational, the controller also detects whether other main pipelines require fire suppression, and switches the system from a single main pipeline mode to a multi-main-pipeline mode. Once multiple main pipelines have gradually activated their fire suppression systems, if the fire on one of the main pipelines has been extinguished, the controller shuts down that main pipeline, and the flow is distributed to the remaining operational main pipelines. The specific implementation process is as follows:

[0059] Step S308: During the fire extinguishing process, if a fire warning message is received from a second electrical device on at least one second branch pipe in the second main pipeline, after detecting that the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate, the speed of the variable frequency pump is increased, and the solenoid valve corresponding to the second main pipeline and the second branch pipe are opened; the extinguishing agent flow rate of the second branch pipe corresponding to the fire point farthest from the extinguishing agent location is detected, and the opening degree of the second solenoid valve is gradually increased; if the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location is not detected, the increase in the opening degree of the second solenoid valve is paused, and the speed of the variable frequency pump is continued to increase to increase the total extinguishing agent flow rate until the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location does not exceed the corresponding rated flow rate, then the opening degree of the second solenoid valve is increased again until the flow rates of the first main pipeline and the second main pipeline remain stable, and the opening degrees of the first and second solenoid valves and the speed of the variable frequency pump are kept constant, entering a stable fire extinguishing state.

[0060] As can be seen from the above, switching from a single-main-line to a multi-main-line operating mode places two requirements on the system:

[0061] (1) System output flow rate, i.e., the speed control of the variable frequency pump;

[0062] (2) How to control the opening degree of each pipeline solenoid valve.

[0063] For example, if a fire is detected in the battery box of an energy storage system, the battery box working pipeline is activated to work independently. Then, if the controller detects that the high-voltage box is also on fire, it needs to switch to a mode in which the main pipelines of the battery box and the high-voltage box work simultaneously. How will the flow rate change?

[0064] A) Determine whether the flow rate of the branch pipe at the battery box ignition point reaches the rated flow rate value.

[0065] The flow rate of the branch pipe furthest from the perfluorohexanone extinguishing agent storage location among one or more ignition points in the battery box is detected. If it is less than the rated flow rate of the branch pipe in the battery box, the variable frequency pump is accelerated to increase the flow rate of that pipe, so that the actual flow rate of the branch pipe furthest from the location reaches the rated flow rate. Thus, the flow rates of the branch pipes at all ignition points in the main pipeline have reached the rated flow rate, which meets the fire extinguishing requirements.

[0066] B) Open the main pipeline of the high-pressure box to divert the extinguishing agent.

[0067] Once the flow rate of each branch pipe in the main pipeline of the battery box can meet the fire extinguishing requirements of the battery box, the speed of the variable frequency pump is increased, the controller opens the solenoid valve of the main pipeline of the high-pressure box to divert the flow to the main pipeline of the high-pressure box, so as to gradually increase the total output flow rate of the fire extinguishing agent in the fire protection system. The flow rate of the fire extinguishing agent in the branch pipe farthest from the battery box and the high-pressure box is continuously monitored, and the valve opening of the solenoid valve in the high-pressure box pipeline is gradually opened.

[0068] If, after opening the solenoid valve on the main high-pressure box, the extinguishing agent flow rate in the furthest branch pipe in the battery box drops below the rated flow rate, then stop increasing the valve opening of the solenoid valve on the main high-pressure box and continue to increase the speed of the variable frequency pump to increase the total extinguishing agent flow rate until the flow rate in the furthest branch pipe in the battery box reaches the rated value. Only then should you start increasing the valve opening of the solenoid valve on the main high-pressure box.

[0069] C) The flow rate of each main pipeline remains stable, the valve opening of each main pipeline and the speed of the variable frequency pump remain unchanged, and the fire enters a stable fire extinguishing state.

[0070] Maintain the extinguishing agent flow rate of the branch pipe furthest from the main pipeline of the battery box and high-voltage box. After the flow rate of the branch pipe furthest from the main pipeline of both pipelines reaches the rated flow rate, keep the valve opening of the solenoid valve in the main pipeline of the battery box and high-voltage box unchanged, keep the speed of the variable frequency pump unchanged, and carry out fire extinguishing.

[0071] Step S310: When it is detected that one or more ignition points on the first target main pipeline have been extinguished, the speed of the variable frequency pump is kept constant, and the opening of the solenoid valve of the first target main pipeline is kept constant, so as to keep the flow rate of the first target main pipeline constant; the first target main pipeline is either the first main pipeline or the second main pipeline.

[0072] As the firefighting efforts continue, some fires in the main road have been extinguished. The system still needs to consider whether changes are necessary for the following two factors.

[0073] (1) The system output flow rate, i.e., whether the speed of the variable frequency pump needs to be changed;

[0074] (2) How to control the opening degree of the working pipeline solenoid valve.

[0075] D) Following step C), if one or more fire points have been extinguished on a main pipeline that is currently being extinguished, then keep the speed of the variable frequency pump constant and keep the valve opening of the main pipeline where the fire point has been extinguished constant, so as to keep the flow rate of the main pipeline constant.

[0076] The reasons are as follows: 1) Considering the risk of reignition at the ignition point and the risk of fires starting at other new locations, maintaining the variable frequency pump's speed and the valve opening on the main pipeline in the system remains constant, thus keeping the flow rate on the main pipeline constant and accelerating the fire extinguishing speed at the ignition point. 2) On the other hand, maintaining the variable frequency pump's speed in this scenario also aims to reduce the number of frequency conversions during firefighting. Considering the risk of variable frequency pump failure due to high temperatures or communication issues, we try to avoid the variable frequency pump switching its output frequency back and forth to ensure the stable operation of the fire protection system.

[0077] Step S312: If it is detected that all ignition points in the first target main pipeline have been extinguished, close the solenoid valve of the first target main pipeline and gradually reduce the speed of the variable frequency pump to reduce the total flow rate of the extinguishing agent; for the second target main pipeline, keep the opening of its solenoid valve unchanged, continuously detect and ensure that the flow rate of the extinguishing agent in the branch pipeline with the farthest distance in the second target main pipeline reaches the rated flow rate.

[0078] The system changes from a mode where multiple pipelines operate simultaneously to one where only one main pipeline is operational (while still having one main pipeline in operation). These changes include two aspects.

[0079] (1) System output flow rate, i.e., the speed control of the variable frequency pump;

[0080] (2) How to control the opening degree of the working pipeline solenoid valve.

[0081] E) Following step D), when all ignition points on a certain main pipeline are extinguished, close the solenoid valve of that main pipeline.

[0082] If all fire points in a main pipeline have been extinguished, close the solenoid valve of that main pipeline and gradually reduce the speed of the variable frequency pump in the fire protection system to decrease the total flow rate of extinguishing agent output by the system. For main pipelines that still need to operate continuously, maintain the opening of their solenoid valves unchanged and continuously monitor whether the flow rate of the extinguishing agent in the farthest branch pipeline has reached the rated value. The flow rate in the farthest branch pipeline must still be maintained above the rated flow rate. Continue until all fire points in the main pipeline have been extinguished, then shut down the solenoid pump and close the solenoid valve of that main pipeline.

[0083] The battery energy storage system provided in this application improves upon the existing perfluorohexanone (PFH) fire suppression system for battery boxes by modifying the piping and control systems within the fire suppression system. This allows the system to utilize only one PPHH fire suppression system, simultaneously addressing the fire suppression needs of the battery box, high-voltage box, and DC cabinet subsystems without requiring additional fire suppression systems. Furthermore, a new operating mode for the fire suppression system is proposed, capable of simultaneously addressing the fire suppression needs of all three subsystems. Specifically, the system can switch between a single-pipe operating mode for one subsystem and a multi-pipe operating mode for two or three subsystems. Supporting devices such as branch pipe flow detection devices, branch pipe switches, and variable frequency pumps are provided, which, in conjunction with the controller, enable switching between operating modes for a single main pipe or multiple main pipes within the system, meeting the fire suppression requirements of all three subsystems.

[0084] Based on the above embodiments, this application also provides a battery energy storage system, wherein the controller in the battery energy storage system includes, for example, the controller of ... Figure 4 The modules shown include an information receiving module 42, which receives fire information sent by electrical equipment; the fire information includes fire warning information, fire extinguishing progress information, and fire extinguishing information; and a fire extinguishing control module 44, which controls the opening / closing of the variable frequency pump, the opening / closing and opening degree of the solenoid valves on the main pipeline, and the opening / closing of the branch pipelines on the main pipeline, based on the fire information sent by the electrical equipment, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs.

[0085] The fire suppression system includes a variable frequency pump and three main pipelines supplying extinguishing agent to a high-voltage box, a battery box, and a DC cabinet, respectively. The total flow rate of the extinguishing agent in the three main pipelines can be controlled by adjusting the speed of the variable frequency pump. Each main pipeline is equipped with a solenoid valve, and the opening degree of the solenoid valve on each main pipeline can be controlled to regulate the extinguishing agent flow rate. The battery energy storage system includes multiple battery boxes, high-voltage boxes, and DC cabinets. Therefore, multiple branch pipelines are installed on each main pipeline. Each branch pipeline is connected to a nozzle for dispensing the extinguishing agent, and each branch pipeline is connected to a high-voltage box, battery box, or DC cabinet to supply extinguishing agent for fire suppression.

[0086] The fire protection system also includes a controller, which receives fire warning information and fire extinguishing progress information from each high-voltage box, battery box, and DC cabinet in the energy storage system, and controls the speed of the variable frequency pump, controls the opening / closing of the solenoid valves on the main pipeline, controls the valve opening degree of each solenoid valve, and controls the opening / closing of each branch pipeline on each main pipeline.

[0087] This application also provides a computer-readable storage medium storing computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the method steps of the controller described above. For specific implementation, please refer to the foregoing method embodiments, which will not be repeated here.

[0088] The computer program product of the apparatus and electronic device provided in this application includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0089] Unless otherwise specifically stated, the relative steps, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application.

[0090] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0091] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0092] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery energy storage system, comprising electrical equipment and a fire protection system, wherein the electrical equipment includes multiple battery boxes, a high-voltage box, and a DC cabinet, characterized in that, The fire protection system includes a controller, a variable frequency pump, and multiple main pipelines for supplying extinguishing agents; each main pipeline is equipped with a solenoid valve and multiple branch pipelines; each branch pipeline is connected to a nozzle for spraying extinguishing agents, and the multiple branch pipelines corresponding to each main pipeline are all connected to the same type of electrical equipment. The controller is used to receive fire information sent by electrical equipment; the fire information includes fire warning information, fire extinguishing progress information and fire extinguishing information; and according to the fire information sent by electrical equipment, control the opening / closing of the variable frequency pump, control the opening / closing and opening degree of the solenoid valve of the main pipeline, and control the opening / closing of the branch pipeline on the main pipeline, so as to realize the fire extinguishing control of different electrical equipment under one or more main pipelines with fire extinguishing needs; The controller is also configured to, upon receiving a fire warning message from a first electrical device on at least one first branch pipe in the first main pipeline, control the opening of the first solenoid valve corresponding to the first main pipeline, control the opening of the first branch pipe, and control the rotation of the variable frequency pump so that the extinguishing agent reaches the first electrical device through the first main pipeline and the first branch pipe to extinguish the fire through the nozzle. Each branch pipe is equipped with a flow detection device. After the step of ensuring that the extinguishing agent reaches the first electrical equipment through the first main pipe and the first branch pipe to extinguish the fire through the nozzle, the controller is further configured to perform the following steps: during the fire extinguishing process, the flow detection device is used to obtain the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location, and to determine whether it exceeds the corresponding rated flow rate; if yes, the variable frequency pump speed is kept constant; if no, the variable frequency pump speed is increased until the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate. The controller is also used to perform the following steps: during the fire extinguishing process, if a fire warning message is received from a second electrical device on at least one second branch pipe in the second main pipeline, after detecting that the flow rate of the extinguishing agent in the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate, the controller increases the speed of the variable frequency pump and opens the second solenoid valve corresponding to the second main pipeline, and opens the second branch pipe; the controller detects the flow rate of the extinguishing agent in the second branch pipe corresponding to the fire point farthest from the extinguishing agent location and gradually increases the opening degree of the second solenoid valve; If the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location is not detected to exceed the corresponding rated flow rate, the increase of the second solenoid valve opening is paused, and the speed of the variable frequency pump is continued to increase to increase the total extinguishing agent flow rate until the extinguishing agent flow rate of the first branch pipe corresponding to the fire point farthest from the extinguishing agent location exceeds the corresponding rated flow rate. Then, the increase of the second solenoid valve opening is resumed until the flow rates of the first and second main pipes remain stable. The opening of the first and second solenoid valves and the speed of the variable frequency pump are kept constant, and the fire extinguishing state is entered.

2. The battery energy storage system according to claim 1, characterized in that, Each of the electrical devices is equipped with a fire sensor, which includes a temperature detection device and a fire detection device; the fire detection device includes an aerosol system or a thermal wire. The electrical equipment is used to detect the internal temperature of the electrical equipment through the temperature detection device and to detect the fire situation through the fire detection device; if the internal temperature of the electrical equipment is higher than the preset temperature threshold, but the fire detection device detects no fire, then the relay and circuit breaker connected to the electrical equipment are controlled to disconnect; if the internal temperature of the electrical equipment is higher than the preset temperature threshold and the fire detection device detects a fire, then a fire warning message is sent to the controller. During the fire extinguishing process, each electrical device corresponding to the ignition point sends a fire extinguishing message to the controller after the built-in temperature sensor detects that the temperature inside the device has remained at a normal value, so that the controller can confirm that the electrical device that has been extinguished has been detected. If the temperature sensor fails at high temperature, infrared temperature measurement is used to determine whether the fire has been completely extinguished. After confirming that the fire has been completely extinguished, the solenoid valve on the corresponding main pipeline is closed by manual control.

3. The battery energy storage system according to claim 1, characterized in that, The controller is also used to perform the following steps: if there are multiple first electrical devices corresponding to the ignition point, the speed of the variable frequency pump is kept constant when the first electrical device that has been extinguished is detected; if the first electrical devices corresponding to all ignition points are detected to be extinguished, the variable frequency pump is turned off, the first solenoid valve corresponding to the first main pipeline is turned off, and the first branch pipeline corresponding to the first electrical device is turned off.

4. The battery energy storage system according to claim 1, characterized in that, After the controller executes the step of entering a stable fire suppression state, it is also used to execute the following steps: When it is detected that one or more ignition points on the first target main pipeline have been extinguished, the speed of the variable frequency pump is kept constant, and the opening of the solenoid valve on the first target main pipeline is kept constant, so as to keep the flow rate of the first target main pipeline constant; the first target main pipeline is either the first main pipeline or the second main pipeline.

5. The battery energy storage system according to claim 4, characterized in that, The controller is also used to perform the following steps: If it is detected that all ignition points in the first target main pipeline have been extinguished, the solenoid valve of the first target main pipeline is closed, and the speed of the variable frequency pump is gradually reduced to reduce the total flow rate of the extinguishing agent; for the second target main pipeline, the opening of its solenoid valve is kept unchanged, and the extinguishing agent flow rate of the branch pipeline with the farthest distance in the second target main pipeline is continuously monitored and ensured to reach the rated flow rate.

6. The battery energy storage system according to claim 1, characterized in that, The controller includes: The information receiving module is used to receive fire information sent by electrical equipment; the fire information includes fire warning information, fire extinguishing progress information, and fire extinguishing information. The fire suppression control module is used to control the opening / closing of the variable frequency pump, the opening / closing and opening degree of the solenoid valves on the main pipeline, and the opening / closing of the branch pipelines on the main pipeline, based on the fire information sent by the electrical equipment, so as to realize the fire suppression control of different electrical equipment under one or more main pipelines with fire protection needs.

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