Alternating current and direct current energy storage charging cabinet and safety control method thereof

Abstract

The invention belongs to the technical field of energy storage electric cabinets, and particularly relates to an alternating current and direct current energy storage charging cabinet and a safety control method thereof.The energy storage charging cabinet comprises a metal cabinet body, an energy storage chamber and an electric control chamber are arranged in the metal cabinet body at intervals, and the energy storage charging cabinet further comprises an energy storage cavity, an interlayer cavity and a ribbon; a concealed compartment, a ventilation hole and a battery carrying plate used for bearing a battery pack are vertically and sequentially arranged in the energy storage cavity, a fire extinguishing bag is arranged in the concealed compartment, the interlayer cavity is communicated with the ventilation hole from the outside of the energy storage cavity, a flame-retardant partition plate, a traction wire and a plug pin used for vertically limiting the fire extinguishing bag are transversely and sequentially arranged in the energy storage cavity, and the traction wire penetrates through the ventilation hole. Penetrating holes are formed in the flame-retardant partition plate; the method comprises steps 1 to 4. When the battery pack is deflagrated, the silk ribbon is burnt out, flames in the energy storage cavity are blocked, the fire extinguishing pack and the battery pack are passively fireproof after falling, and the device is used for safely controlling the deflagrated battery pack in a power-off state.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage electric cabinets, and particularly relates to an AC-DC energy storage charging cabinet and a safety control method therefor. Background Art

[0002] An AC-DC energy storage charging cabinet, usually simply referred to as an energy storage electric cabinet, is a device specifically designed to store and release electric energy. Its core components include a battery pack, an energy storage inverter (EMS), a battery management system (BMS), an energy management system (EMS), etc. It not only helps to balance the power grid load and improve the energy utilization efficiency, but also provides stable and reliable power support for various application scenarios.

[0003] Renewable energy power generation systems such as solar energy and wind energy widely use AC-DC energy storage charging cabinets to balance the power grid load and improve the utilization rate of renewable energy. These energy storage charging cabinets are often located in remote areas and are only inspected once a day, and the battery pack faults are monitored. For example, a Chinese invention with the publication number CN116020070A, a lithium battery energy storage station fire protection system, mainly adds a perfluoromethyl hexanone precise suppression system on the basis of a heptafluoropropane total flooding protection system. The perfluoromethyl hexanone fire extinguishing agent can be accurately delivered into the battery box where thermal runaway occurs, effectively reducing the temperature of the damaged battery, preventing heat accumulation, and preventing thermal runaway. However, there are the following problems: 1. The fire extinguishing agent is sprayed into the battery pack inside the energy storage charging cabinet to isolate the air. However, as the battery pack reignites, the electrically controlled valve in the power-off state will not be able to effectively provide the fire extinguishing agent, which is not conducive to the safety control of the reignited battery pack.

[0004] 2. Some energy storage charging cabinets choose to install electric push rods. When the temperature sensor detects an abnormality in the battery pack, the battery pack is pushed out by the electric push rod for elimination. However, when the battery pack explodes and catches fire, the power will be cut off, causing the electric push rod to stop, which is not conducive to the safety control of the power-off battery pack. Summary of the Invention

[0005] The purpose of the present invention is to provide an AC-DC energy storage charging cabinet and a safety control method therefor, which burn the ribbon when the battery pack explodes and catches fire, block the flame in the energy storage cavity, and drop the fire extinguishing package and the battery pack for passive fire protection, so as to safely control the exploding and burning battery pack in the power-off state.

[0006] The technical solutions adopted by the present invention are specifically as follows: An AC-DC energy storage charging cabinet includes a metal cabinet body. An energy storage room and an electric control room are arranged at intervals inside the metal cabinet body. The AC-DC energy storage charging cabinet further includes: An energy storage cavity is opened inside the energy storage room. An inner cavity of the energy storage cavity is vertically and sequentially provided with a hidden compartment, a ventilation hole, and a battery carrier plate for carrying a battery pack. A fire extinguishing package is arranged inside the hidden compartment; Interlayer cavity, the interlayer cavity communicates with the ventilation hole from the outside of the energy storage cavity. Inside the energy storage chamber, a flame retardant partition, a traction wire, and a pin for vertically limiting the fire extinguishing package are sequentially arranged horizontally. Among them, the traction wire passes through the ventilation hole, and a penetration hole is provided on the flame retardant partition; Ribbon, the ribbon sequentially passes through the battery carrier board, the ventilation hole, and the penetration hole, and both ends of the ribbon are tied to the top wall of the energy storage cavity. When the battery pack explodes and burns, the ribbon is burned off, causing the battery carrier board to tilt and releasing the flame retardant partition, so as to slide the battery pack, the flame retardant partition, and the fire extinguishing package. While blocking the flame in the energy storage cavity, the fire extinguishing package that falls on the battery pack is used to extinguish the flame, which is used to safely control the exploding battery pack in the power-off state.

[0007] As an alternative solution, a flame retardant pool is installed at the bottom of the energy storage chamber. A gel medium and a polyethylene film located on the liquid surface of the gel medium are arranged inside the flame retardant pool. When the battery pack drops, the battery pack is wrapped by the gel medium, and the polyethylene film is used to block the splashing of the gel medium.

[0008] As an alternative solution, a cover plate is hinged at the opening of the hidden compartment. A suspended lock ring through which the pin passes and a heat insulation layer for heat insulation of the fire extinguishing package are respectively fixed on both sides of the cover plate. When the flame retardant partition drops, the traction wire is pulled to pull out the pin to open the cover plate, so that the fire extinguishing package falls from the hidden compartment.

[0009] As an alternative solution, the fire extinguishing package includes bagged dry powder, a middle bag integrally arranged inside the bagged dry powder, and a carbon dioxide glass bottle located inside the middle bag. When the cover plate is opened, the carbon dioxide glass bottle is heated by the exploding battery pack and causes an explosion to impact the dispersion of the bagged dry powder, which is used to extinguish the flame on the battery pack.

[0010] As an alternative solution, a decorative panel, a first heat dissipation fan, and a series interface are installed at the opening of the energy storage cavity. A secondary power cord for connecting battery packs in series is connected between adjacent series interfaces.

[0011] As an alternative solution, a second fan is installed at the top of the energy storage chamber. An air duct communicating with the interlayer cavity is provided at the top of the energy storage cavity, and the position of the air duct facing the interlayer cavity is multi-headed.

[0012] As an alternative solution, a triangular stopper and an arc-shaped steel frame connected to the top of the triangular stopper are fixed at the top of the energy storage cavity. When the battery carrier board tilts, the arc-shaped steel frame deforms to buffer the battery carrier board until the battery carrier board abuts against the top of the triangular stopper.

[0013] As an optional solution, a BMS module, an EMS module, a control module and wiring terminals are vertically arranged in sequence inside the electric control room. The BMS module, the EMS module, the control module and the wiring terminals are all connected to the battery pack through the secondary power line, and a display panel connected to the BMS module is installed outside the metal cabinet.

[0014] As an optional solution, a perfluorohexanone fire extinguisher tank is installed at the bottom of the electric control room, and the air outlet of the perfluorohexanone fire extinguisher tank is connected to a solenoid valve, a branch pipe and a nozzle in sequence, and the nozzle opening extends into the energy storage chamber.

[0015] A safety control method for an AC / DC energy storage charging cabinet comprises the following steps: Step 1, installation stage: put the fire extinguishing bag into the secret compartment, cover it with two symmetrical covers, and limit it vertically with a latch; then pass the ribbon through the battery carrier, ventilation holes, and penetration holes in sequence, and fasten the two ends of the ribbon to the top wall of the energy storage cavity. On one hand, suspend the flame-retardant partition, and on the other hand, hold the battery carrier. At this time, put the battery pack on the battery carrier in a horizontal state in the energy storage cavity, and then connect the battery pack to the power grid through external wiring; Step 2, thermal runaway stage: the temperature of the battery pack rises suddenly, the flame generated by the deflagration burns the ribbon, loosens the flame-retardant partition, and makes the ventilation hole and the penetration hole misaligned with each other. At this time, the flame-retardant partition blocks the flame in the energy storage cavity; Step 3: Preliminary treatment: When the flame retardant partition falls, pull the traction belt to drive the latch out of the secret compartment, so that the secret compartment opens and the fire extinguishing bag falls, and the fire extinguishing bag dropped on the battery pack is used to extinguish the flame; Step 4: Disengagement: The battery carrier is tilted toward the back of the metal cabinet and has a 15° inclination angle to slide off the battery pack, which is used to safely control the battery pack that explodes when the power is off.

[0016] The technical effects achieved by the present invention are: When the battery pack explodes, the present invention burns the ribbon, tilts the battery carrier toward the back of the metal cabinet and loosens the flame-retardant partition. At this time, the battery carrier has a 15° inclination angle to slide off the battery pack and the flame-retardant partition, so that the ventilation holes and the penetration holes are misaligned with each other, thereby blocking the flame in the energy storage cavity and achieving passive fire protection. When the flame-retardant partition falls, the traction ribbon is pulled to move the latch out of the secret compartment, so that the secret compartment opens and the fire extinguishing bag falls. The fire extinguishing bag dropped on the battery pack is used to extinguish the flame, thereby safely controlling the deflagrated battery pack in a power-off state.

[0017] When the battery pack falls, the flame retardant pool catches it and the gel medium wraps the battery pack to isolate oxygen and prevent re-ignition. The polyethylene film is used to block the gel medium from splashing and prevent other battery packs from getting wet.

[0018] When the cover plate of the present invention is opened, the explosion of the battery pack in contact with the heated carbon dioxide glass bottle causes an explosion, so that the carbon dioxide gas spreads instantly to impact the dispersion of the bagged dry powder, which is used to extinguish the fire on the battery pack, and the fire extinguishing range can be controlled within a single energy storage cavity with less interference to other battery packs.

[0019] Through the processing of steps 1 to 4, the present invention can, in the power-off state, passively trigger the detachment of the reignited battery pack to prevent a larger fire caused by the retention of the battery pack, and cover the fire on the battery pack with the built-in fire extinguishing pack to accurately apply the dry powder fire extinguishing agent in a static fire extinguishing manner, and finally wrap the dropped battery pack to gain valuable disaster relief time for the emergency repair personnel. Brief Description of the Drawings

[0020] Figure 1 is the front view of an AC / DC energy storage charging cabinet in Embodiment 1 of the present invention; Figure 2 is the schematic structural diagram of the interior of the energy storage chamber in Embodiment 1 of the present invention; Figure 3 is the schematic structural diagram of the energy storage cavity in Embodiment 1 of the present invention; Figure 4 is the schematic structural diagram of the ribbon threading state in Embodiment 1 of the present invention; Figure 5 is the front view of the ribbon in Embodiment 1 of the present invention; Figure 6 is the cross-sectional view of the flame retardant pool in Embodiment 1 of the present invention; Figure 7 is the schematic structural diagram of the three-dimensional arrangement of the fire extinguishing pack and the battery pack in Embodiment 1 of the present invention; Figure 8 is the top view of the hidden compartment in Embodiment 1 of the present invention; Figure 9 is the bottom view of the hidden compartment in Embodiment 1 of the present invention; Figure 10 is the cross-sectional view of the fire extinguishing pack in Embodiment 1 of the present invention; Figure 11 is the front view of the air duct in Embodiment 1 of the present invention; Figure 12 is the gas circuit block diagram of the perfluorinated hexanone fire extinguishing tank in Embodiment 1 of the present invention; Figure 13 is the flow chart of the safety control method in Embodiment 2 of the present invention.

[0021] In the drawings, the list of components represented by each reference numeral is as follows: 1. Metal cabinet; 2. Energy storage room; 3. Electric control room; 4. Energy storage cavity; 401. Hidden compartment; 4011. Cover plate; 4012. Suspended lock ring; 4013. Insulation layer; 402. Ventilation hole; 403. Battery carrier; 5. Interlayer cavity; 501. Flame retardant partition; 502. Through hole; 503. Drag wire; 504. Latch; 6. Ribbon; 7. Flame retardant pool; 701. Gel medium; 702. Polyethylene film; 801. Bag dry powder; 802. Middle bag; 80 3. Carbon dioxide glass bottle; 9. Decorative panel; 901. First cooling fan; 902. Serial interface; 903. Secondary power cord; 904. Connector probe; 10. Triangular block; 1001. Arc steel frame; 101. Second fan; 102. Air duct; 11. BMS module; 12. EMS module; 13. Control module; 14. Display panel; 15. Wiring terminal; 16. Perfluorohexanone fire extinguisher tank; 17. Branch pipe; 18. Solenoid valve; 19. Nozzle. DETAILED DESCRIPTION

[0022] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0023] Embodiment 1: Since solar power generation is affected by lighting conditions, the power generation of solar power generation bases will fluctuate greatly within a day. When there is sufficient sunlight during the day, solar panels can generate enough electricity for the equipment to use, but at night or when there is insufficient light, the solar power generation system cannot provide enough electricity. At this time, the energy storage cabinet can play a role in supplementing electricity and ensuring the continuous and stable operation of the equipment. This embodiment takes a tidal flat photovoltaic storage integrated project with an installed capacity of 1,000 megawatts as an example, and builds a 400 megawatt-hour energy storage facility.

[0024] like Figures 1 - 12 As shown, an AC / DC energy storage charging cabinet includes a metal cabinet 1, an energy storage room 2 and an electric control room 3 are arranged inside the metal cabinet 1, battery packs are distributed in an array inside the energy storage room 2, and these battery packs are connected in series to store electric energy, and a control circuit is configured inside the electric control room 3, which can be well connected with the photovoltaic inverter, ensuring that the electric energy generated by the photovoltaic system can be stably input into the energy storage charging cabinet, providing a strong guarantee for the stable operation of the power system.

[0025] See attached Figure 1 The energy storage chamber 4 is provided inside the energy storage chamber 2 and two sets of energy storage chambers 4 are arranged side by side. Figure 2, the number of each energy storage cavity 4 is 8. Among them, the lowermost energy storage cavity 4 is empty or used for installing a power cut-off switch. Since a decorative panel 9, a first heat dissipation fan 901 and a series connection interface 902 are installed at the opening of the energy storage cavity 4, the decorative panel 9 can be fastened by screws. Only the secondary power lines 903 connected between adjacent series connection interfaces 902 are needed to connect the battery packs in series, and the battery packs can be connected to the power grid through external wiring. The positive and negative electrodes of the internal battery packs are inserted into the series connection interfaces 902 with connector probes 904 and do not need to be directly exposed. They can be placed into the alloy door on the back of the metal cabinet 1 without breaking or disassembling the decorative panel 9.

[0026] Refer to the appendix Figure 1 , inside the electric control room 3, a BMS (Battery Management System) module 11, an EMS (Energy Management System) module 12, a control module 13 and a terminal block 15 are arranged vertically in sequence. The BMS module 11, the EMS module 12, the control module 13 and the terminal block 15 serve as control circuits, and the control circuits are connected to the power cut-off switch through cables to realize the connection with the battery packs through the secondary power lines 903. Among them: The BMS module 11 monitors parameters such as the voltage, current, and temperature of the battery packs in real time through sensors, judges the charge and discharge states of the batteries. When the parameters of the batteries exceed the safe range, the BMS module 11 will issue an alarm in time and take measures to protect the battery packs, and transmit the operation data of the batteries to the Energy Management System (EMS) to provide a basis for subsequent energy optimization configuration; The EMS module 12 is the "brain" of the energy storage charging cabinet, responsible for coordinating the energy exchange between the energy storage room 2 and the external power grid, realizing the optimal configuration of energy, charging during the low load period of the power grid and discharging during the high load period, realizing the optimal utilization of energy, and can also adjust the charge and discharge strategies of the energy storage charging cabinet in time according to the dispatching instructions of the power grid, and participate in demand response services such as peak shaving and frequency modulation of the power grid; The control module 13 is responsible for monitoring and controlling the overall operation of the energy storage charging cabinet, including: The hardware part, such as microprocessors, sensors, relays, etc., is responsible for collecting data in real time and executing control instructions; The software part, such as monitoring software, control algorithms, etc., is responsible for analyzing data, generating control strategies and executing them; The terminal block 15 can also be called a PCS (AC-DC Power Converter) module, and has wiring ports on its surface. The wire ends can be pressed tightly with bolts. During charging, the PCS module converts alternating current into direct current to charge the battery packs; during discharging, the PCS module converts direct current into alternating current for use by the power system or other devices; Furthermore, a display panel 14 electrically connected to the BMS module 11 is installed outside the metal cabinet 1 to display parameters such as the voltage, current, and temperature of the battery packs outside the metal cabinet 1.

[0027] Referring to the attached Figure 1 and Figure 12 , for daily online fire prevention, in this embodiment, a perfluoroketone fire extinguishing tank 16 is installed at the bottom of the electrical control room 3 through a clamp, avoiding the terminal 15. An electromagnetic valve 18, a branch pipe 17 and a nozzle 19 can be sequentially connected to the air outlet of the perfluoroketone fire extinguishing tank 16. The electromagnetic valve 18 is electrically connected to the PLC carried by the display panel 14, such as a Mitsubishi single-chip microcomputer, which can receive the monitoring signals of the BMS module 11. Once the battery pack is abnormal and these abnormal monitoring signals are received, the corresponding electromagnetic valve 18 can be controlled to open. Since the opening of the nozzle 19 extends into the energy storage cavity 4, the perfluoroketone fire extinguishing tank 16 sprays perfluoroketone gas toward the corresponding energy storage cavity 4 along the electromagnetic valve 18, the branch pipe 17 and the nozzle 19 to isolate the air. And a large amount of heat will be absorbed during the gasification process of perfluoroketone, quickly reducing the temperature of the battery pack and preventing the battery pack from exploding and burning.

[0028] Although the temperature of the battery pack is temporarily reduced, there may still be chemical reactions inside it, making it very likely that re-ignition will occur. This is also one of the main culprits inducing the fire of the energy storage charging cabinet. Once the battery pack explodes and burns, the entire energy storage charging cabinet will be damaged by the fire, causing unnecessary losses of property.

[0029] Referring to the attached Figure 2 , Figure 3 and Figure 4 , in this embodiment, a flame retardant partition 501 is further provided in the energy storage chamber 2, a through hole 502 opened on the flame retardant partition 501, an interlayer cavity 5 for circulating cold air around the energy storage cavity 4, and a dark grid 401, a fire extinguishing pack located inside the dark grid 401, a ventilation hole 402 and a battery carrier plate 403 for carrying the battery pack are sequentially arranged vertically inside the energy storage cavity 4. Since the interlayer cavity 5 communicates with the ventilation hole 402 from the outside of the energy storage cavity 4, cold air can enter the energy storage cavity 4 from the interlayer cavity 5 to cool the battery pack. For the stable setting of the battery pack, in this embodiment, a ribbon 6 made of polypropylene fiber is provided for each energy storage cavity 4, such as Figure 5 , since the ribbon 6 sequentially penetrates through the battery carrier plate 403, the ventilation hole 402, the through hole 502 and the two ends of the ribbon 6 are fastened to the top wall of the energy storage cavity 4. When the battery pack explodes and burns, the ribbon 6 is burned off, causing the battery carrier plate 403 to tilt toward the back of the metal cabinet 1 and loosen the flame retardant partition 501. At this time, the battery carrier plate 403 has an inclination angle of 15°, so as to slide off the battery pack and the flame retardant partition 501, making the ventilation hole 402 and the through hole 502 misaligned with each other to block the flame in the energy storage cavity 4; Further, for passive fire protection, in this embodiment, a flame retardant partition 501, a traction wire 503, and a pin 504 for vertically limiting the fire extinguishing package are sequentially arranged horizontally inside the energy storage chamber 2. Among them, the traction wire 503 passes through the ventilation hole 402. When the flame retardant partition 501 drops, the traction wire 503 is pulled to drive the pin 504 to disengage from the concealed compartment 401, opening the concealed compartment 401 to drop the fire extinguishing package, and using the fire extinguishing package dropped on the battery pack to extinguish the flame, which is used to safely control the deflagration of the battery pack in the power-off state; Furthermore, the flame retardant partition 501 is made of a high-temperature resistant alloy steel plate. To avoid deviation, it is guided by the slide rails on both sides of the energy storage cavity 4, and can slide down smoothly when the ribbon 6 breaks. Moreover, bamboo carbon fiber is woven at intervals inside the ribbon 6 to enhance the tensile strength, and the flame retardant partition 501 can be stably suspended.

[0030] Since the ribbon 6 and the traction wire 503 are confined to a single energy storage cavity 4, they will not ignite other battery packs due to the influence of the flame. In addition, the ribbon 6 will melt when it comes into contact with the heat wave, and basically no open fire is generated. The traction wire 503 is made of steel wire and does not burn, so the safety is good.

[0031] Refer to the appendix Figure 2 and Figure 11 As the cold air inside the metal cabinet 1 needs to be agitated, in this embodiment, a second fan 101 is installed on the top of the energy storage chamber 2 by screws. The second fan 101 is electrically connected to the PLC and continuously started. An air guide pipe 102 communicating with the sandwich cavity 5 is arranged at the top of the energy storage cavity 4 to drain the cold air, and the position of the air guide pipe 102 facing the sandwich cavity 5 is multi-headed, so that the cold air can cover more ventilation holes 402 and penetration holes 502.

[0032] Refer to the appendix Figure 8 、 Figure 9 and Figure 10 For the daily setting of the fire extinguishing package, sufficient ventilation space needs to be left from the battery pack for the cold air to circulate and dissipate heat. Therefore, in this embodiment, a cover plate 4011 is hinged at the opening of the concealed compartment 401. Suspended lock rings 4012 through which the pin 504 passes and a heat insulation layer 4013 for heat insulation of the fire extinguishing package are adhesively bonded to both sides of the cover plate 4011. When installing, the fire extinguishing package is placed in the concealed compartment 401 to be separated from the battery pack, and then two symmetrical cover plates 4011 are covered, and the pin 504 is inserted into the two suspended lock rings 4012 for vertical limitation. When the flame retardant partition 501 drops, the traction wire 503 is pulled to pull out the pin 504 to open the cover plate 4011, so that the fire extinguishing package falls from the concealed compartment 401 and is accurately applied to the deflagrating battery pack.

[0033] Refer to the appendix Figure 7 and Figure 10, the fire extinguishing package used in this embodiment includes a bagged dry powder 801, a middle bag 802 integrally arranged inside the bagged dry powder 801, and a carbon dioxide glass bottle 803 located inside the middle bag 802. Since the carbon dioxide glass bottle 803 is filled with sufficient carbon dioxide gas, when the cover plate 4011 is opened, the explosion of the battery pack in deflagration contacts and heats the carbon dioxide glass bottle 803 to cause an explosion, so that the carbon dioxide gas spreads instantaneously to impact and disperse the bagged dry powder 801 for extinguishing the fire on the battery pack, which can control the fire extinguishing range within a single energy storage cavity 4 with less interference to other battery packs. For the dry powder fire extinguishing agent stored in the bagged dry powder 801, there are the following options: BC dry powder, the base material is mainly sodium bicarbonate (potassium) powder; ABC dry powder, the base material is mainly ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate and their mixture powders; D-class dry powder, the base material is mainly sodium chloride, potassium chloride, barium chloride, sodium carbonate powder.

[0034] Refer to the appendix Figure 2 and Figure 3 , a triangular stopper 10 is fixed to the top of the energy storage cavity 4 by screws and an arc-shaped steel frame 1001 connected to the top of the triangular stopper 10. When the battery carrier plate 403 is tilted, the battery carrier plate 403 is buffered by the deformation of the arc-shaped steel frame 1001 until the battery carrier plate 403 abuts against the top of the triangular stopper 10, so that the battery pack slides down at this inclination angle to avoid staying in the energy storage cavity 4.

[0035] Refer to the appendix Figure 2 and Figure 6 , a flame retardant pool 7 is installed at the bottom of the energy storage chamber 2. A gel medium 701 and a polyethylene film 702 located on the liquid surface of the gel medium 701 are arranged inside the flame retardant pool 7. When the battery pack drops, it is caught by the flame retardant pool 7. The battery pack is wrapped by the gel medium 701, which can isolate oxygen and prevent re-ignition. The polyethylene film 702 is used to block the splashing of the gel medium 701 to prevent wetting other battery packs. Among them, the gel medium 701 can be selected as FRGPE (flame retardant gel polymer electrolyte) or AC-MCG (MOF-based composite gel).

[0036] Embodiment 2: The thermal runaway of the energy storage charging cabinet is usually divided into several stages: initial temperature rise, abnormal high temperature, sudden deflagration and secondary re-ignition. Among them, the re-ignited battery pack is more harmful, which is reflected in the existing fire extinguishing agent distribution and it is difficult to give it again in the power-off state. Therefore, this embodiment gives a theoretical basis for the safety control of the battery pack in the power-off state.

[0037] As Figure 13 shown, a safety control method for an AC-DC energy storage charging cabinet includes the following steps: Step 1. Installation stage: First, place the fire extinguishing package into the concealed compartment 401, cover it with two symmetrical cover plates 4011, and insert a bolt 504 into two suspended locking rings 4012 for vertical positioning. Then, thread the silk ribbon 6 successively through the battery carrier plate 403, the ventilation holes 402, and the penetration holes 502, and fasten both ends of the silk ribbon 6 to the top wall of the energy storage cavity 4. On the one hand, it suspends the flame retardant partition 501, and on the other hand, it pulls the battery carrier plate 403, so that the battery pack can be placed on the horizontally placed battery carrier plate 403 in the energy storage cavity 4. Next, install the decorative panel 9 at the opening of the energy storage cavity 4. The positive and negative electrodes of the internal battery pack are plugged into the series interface 902 with the connection probes 904, without being directly exposed. The secondary power lines 903 connected between adjacent series interfaces 902 are used to connect the battery packs in series, and the battery pack can be connected to the power grid through external wiring. Step 2: Thermal runaway stage: The temperature of the battery pack rises suddenly and cannot be suppressed, causing an explosion and combustion. The flame generated by the explosion and combustion burns off the silk ribbon 6, which will loosen the flame retardant partition 501, causing the ventilation holes 402 and the penetration holes 502 to be misaligned. At this time, the flame retardant partition 501 blocks the flame in the energy storage cavity 4. Step 3: Preliminary treatment: When the flame retardant partition 501 drops, it pulls the traction wire 503 to drive the bolt 504 to disengage from the concealed compartment 401, causing the concealed compartment 401 to open and drop the fire extinguishing package, and using the fire extinguishing package dropped on the battery pack to extinguish the flame. Among them, when the cover plate 4011 is opened, the explosion of the carbon dioxide glass bottle 803 is caused by the contact heating of the exploding battery pack, so that the carbon dioxide gas spreads instantly to impact and disperse the bagged dry powder 801 for extinguishing the flame on the battery pack. Step 4: Disengagement treatment: Tilt the battery carrier plate 403 towards the back of the metal cabinet 1, and at this time, the battery carrier plate 403 has an inclination angle of 15°, so that the battery pack slides off, and the battery pack pulls the connection probe 904 to break free from the series interface 902 without damaging the external secondary power line 903. Catch it with the flame retardant pool 7, wrap the battery pack with the gel medium 701, and use the polyethylene film 702 to block the splashing of the gel medium 701 for safely controlling the exploding battery pack in the power-off state. Among them, the battery carrier plate 403 can also have an inclination angle of 10°, and the battery pack slides down with a smaller inclination angle, which can reduce the acceleration and prevent the battery pack from falling too fast and causing a violent impact.

[0038] In summary, this embodiment, through the processing of steps one to four, can detach the reignited battery pack in a passively triggered manner in a power-off state to prevent the battery pack from being retained and causing a larger fire, and cover the flame of the battery pack with a built-in fire extinguishing pack, accurately apply dry powder fire extinguishing agent in a static fire extinguishing manner, and finally wrap the fallen battery pack to buy precious rescue time for repair personnel.

[0039] The above is only an optional implementation of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. An AC / DC energy storage charging cabinet, comprising a metal cabinet body (1), wherein an energy storage chamber (2) and an electric control chamber (3) are arranged at intervals inside the metal cabinet body (1), and it is characterized in that, Further comprising: A energy storage cavity (4), which is opened inside the energy storage chamber (2). Inside the energy storage cavity (4), a concealed compartment (401), a ventilation hole (402), and a battery carrier plate (403) for carrying battery packs are successively arranged vertically. A fire extinguishing package is arranged inside the concealed compartment (401); A sandwich cavity (5), inside the energy storage chamber (2), a flame retardant partition (501), a traction wire (503), and a latch (504) for vertically limiting the fire extinguishing package are successively arranged horizontally. A through hole (502) is opened on the flame retardant partition (501); A silk ribbon (6), the silk ribbon (6) successively penetrates through the battery carrier plate (403), the ventilation hole (402), and the through hole (502), and both ends of the silk ribbon (6) are fastened to the top wall of the energy storage cavity (4). When the battery pack explodes and burns, the silk ribbon (6) is burned off, causing the battery carrier plate (403) to tilt and releasing the flame retardant partition (501), so as to slide down the battery pack, the flame retardant partition (501), and the fire extinguishing package, blocking the flame in the energy storage cavity (4), and at the same time using the fire extinguishing package falling on the battery pack to extinguish the flame.

2. The AC / DC energy storage charging cabinet according to claim 1, wherein: A flame retardant pool (7) is installed at the bottom of the energy storage chamber (2). Inside the flame retardant pool (7), a gel medium (701) and a polyethylene film (702) located on the liquid surface of the gel medium (701) are arranged. When the battery pack drops, the battery pack is wrapped by the gel medium (701), and the polyethylene film (702) is used to block the splashing of the gel medium (701).

3. The AC / DC energy storage charging cabinet according to claim 1, characterized in that: A cover plate (4011) is hinged at the opening of the concealed compartment (401). On both sides of the cover plate (4011), a suspended lock ring (4012) through which the latch (504) passes and a heat insulation layer (4013) for heat insulation of the fire extinguishing package are respectively fixed. When the flame retardant partition (501) drops, the traction wire (503) is pulled to extract the latch (504), so as to open the cover plate (4011), and the fire extinguishing package falls from the concealed compartment (401).

4. The AC / DC energy storage charging cabinet according to claim 3, wherein: The fire extinguishing package includes a bagged dry powder (801), a middle bag (802) integrally arranged inside the bagged dry powder (801), and a carbon dioxide glass bottle (803) located inside the middle bag (802). When the cover plate (4011) is opened, the carbon dioxide glass bottle (803) is heated by the exploding and burning battery pack to cause an explosion, so as to impact the dispersion of the bagged dry powder (801) for extinguishing the flame on the battery pack.

5. The AC / DC energy storage charging cabinet according to claim 1, wherein: A decorative panel (9), a first heat dissipation fan (901), and a series interface (902) are installed at the opening of the energy storage cavity (4). A secondary power cord (903) for connecting battery packs in series is connected between adjacent series interfaces (902).

6. The AC / DC energy storage charging cabinet according to claim 1, wherein: A second fan (101) is installed at the top of the energy storage chamber (2). An air duct (102) communicating with the sandwich cavity (5) is arranged at the top of the energy storage cavity (4), and the position of the air duct (102) facing the sandwich cavity (5) is in a multi-head shape.

7. The AC / DC energy storage charging cabinet according to claim 1, characterized in that: A triangular stopper (10) and an arc-shaped steel frame (1001) connected to the top of the triangular stopper (10) are fixed to the top of the energy storage chamber (4); when the battery carrier (403) is tilted, the battery carrier (403) is buffered by deformation of the arc-shaped steel frame (1001) until the battery carrier (403) abuts against the top of the triangular stopper (10).

8. The AC-DC energy storage charging cabinet according to claim 5, characterized in that: A BMS module (11), an EMS module (12), a control module (13) and a wiring terminal (15) are vertically arranged in sequence inside the electric control room (3); the BMS module (11), the EMS module (12), the control module (13) and the wiring terminal (15) are all connected to the battery pack via the secondary power line (903); and a display panel (14) connected to the BMS module (11) is installed outside the metal cabinet (1).

9. The AC / DC energy storage charging cabinet according to claim 1, wherein: A perfluorohexanone fire extinguisher tank (16) is installed at the bottom of the electric control room (3); an air outlet of the perfluorohexanone fire extinguisher tank (16) is sequentially connected to a solenoid valve (18), a branch pipe (17) and a nozzle (19); an opening of the nozzle (19) extends into the energy storage chamber (4).

10. A safety control method for an AC-DC energy storage charging cabinet, which is applied to the AC-DC energy storage charging cabinet according to any one of claims 1-9, and is characterized in that, The following steps are involved: Step 1, installation stage: put the fire extinguishing bag into the secret compartment (401), cover it with two symmetrical cover plates (4011), and use the latch (504) to limit it vertically; then, pass the ribbon (6) through the battery carrier (403), the ventilation hole (402), and the penetration hole (502) in sequence, and fasten the two ends of the ribbon (6) to the top wall of the energy storage cavity (4), suspend the flame retardant partition (501) on the one hand, and hold the battery carrier (403) on the other hand. At this time, put the battery pack on the battery carrier (403) in a horizontal state in the energy storage cavity (4), and then connect the battery pack to the power grid through external wiring; Step 2, thermal runaway stage: the temperature of the battery pack rises suddenly, the flame generated by the deflagration burns the ribbon (6), loosens the flame-retardant partition (501), and causes the ventilation hole (402) and the penetration hole (502) to be misaligned with each other. At this time, the flame-retardant partition (501) blocks the flame in the energy storage cavity (4); Step 3, preliminary treatment: when the flame retardant partition (501) falls, the pulling wire (503) is pulled to drive the latch (504) to disengage from the hidden compartment (401), so that the hidden compartment (401) opens and the fire extinguishing bag falls, and the fire extinguishing bag falling on the battery pack is used to extinguish the flame; Step 4: Separation process: The battery carrier (403) is tilted toward the back of the metal cabinet (1) and the battery carrier (403) has an inclination angle to slide off the battery pack, so as to safely control the battery pack from exploding in a power-off state.

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