An energy storage system for a hydrogen-containing fuel cell

Abstract

The application discloses a hydrogen fuel cell energy storage system, which comprises a hydrogen fuel cell module, an energy storage battery module, an energy management module (EMS), a power conversion system (PCS), a high-voltage box and a direct-current bus, wherein the high-voltage box comprises a battery management module (BMS); the hydrogen fuel cell energy storage system further comprises a hydrogen fuel cell switch, the high-voltage box further comprises a switch circuit, the hydrogen fuel cell module is electrically connected to the direct-current bus through the hydrogen fuel cell switch, and the energy storage battery module is also electrically connected to the direct-current bus through the high-voltage box; the hydrogen fuel cell module, the battery management module (BMS) and the power conversion system (PCS) are in communication connection with the energy management module (EMS); the battery management module (BMS) is electrically connected to the energy storage battery module, and the battery management module (BMS) is electrically connected to the switch circuit. The hydrogen fuel cell energy storage system can solve the overcharging and overdischarging problems of the energy storage battery module in an off-grid mode and has higher system safety and reliability.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and specifically to an energy storage system containing a hydrogen fuel cell. Background Technology

[0002] With the transformation of the global energy structure and the development of clean energy, hydrogen energy, as an efficient and clean energy carrier, has shown great potential in the fields of energy storage and power generation.

[0003] For example, Chinese utility model patent with authorization announcement number CN221928292U discloses an energy storage system containing a hydrogen fuel cell, including an energy management system (EMS), a hydrogen fuel cell, an energy storage lithium battery, a battery management system (BMS), and an energy storage converter (PCS); the hydrogen fuel cell, the energy storage battery management system (BMS), and the energy storage converter (PCS) are all electrically connected to the energy management system (EMS), and the energy storage lithium battery is electrically connected to the battery management system (BMS). This energy storage system is equipped with a hydrogen fuel cell and a lithium battery. When the grid fails or experiences a power outage, the hydrogen fuel cell and the lithium battery can work together as needed. When the lithium battery has sufficient charge, it supplies power to the load independently, while the hydrogen fuel cell is shut down. When the lithium battery is low on charge, the hydrogen fuel cell starts up, supplies power to the load, and charges the lithium battery. The hydrogen fuel cell serves as a backup power source for the energy storage system, and its collaborative operation with the lithium battery extends the system's power supply time. Furthermore, the hydrogen fuel cell and the lithium battery share the same DC bus, allowing the lithium battery to provide DC power for the hydrogen fuel cell's startup and also solving the charging problem of the lithium battery in off-grid mode.

[0004] However, existing hydrogen fuel cell-based energy storage systems still have the following technical problems: In grid-connected mode, the power supply converter (PCS) can control the charging and discharging of the energy storage battery; however, in off-grid mode, the DC bus is connected not only to the energy storage battery but also to the hydrogen fuel cell. This results in multiple DC power sources connected to the same DC bus, but there is no switching structure. Furthermore, in off-grid mode, the PCS focuses on the continuous and stable power supply to the load side, and cannot control the hydrogen fuel cell or the multiple DC power sources connected to the same DC bus. As a result, it cannot solve the overcharging and over-discharging problems of the energy storage battery in off-grid mode, nor can it guarantee the safety and reliability of the system when the hydrogen fuel cell and the energy storage battery are abnormal. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a hydrogen fuel cell energy storage system that can solve the overcharging and over-discharging problems of energy storage battery modules in off-grid mode, and has higher system safety and reliability.

[0006] The technical solution of this utility model is: an energy storage system containing a hydrogen fuel cell, comprising a hydrogen fuel cell module, an energy storage battery module, an energy management module (EMS), an energy storage converter (PCS), a high-voltage box, and a DC bus. The high-voltage box includes the battery management module (BMS) and a hydrogen fuel cell switch. The high-voltage box also includes a switching circuit. The hydrogen fuel cell module is electrically connected to the DC bus via the hydrogen fuel cell switch. The energy storage battery module is also electrically connected to the DC bus via the high-voltage box. The DC bus is electrically connected to the DC side of the energy storage converter (PCS). The AC side of the energy storage converter (PCS) is connected to the mains power supply. Load power supply; the hydrogen fuel cell module, battery management module (BMS), and energy storage converter (PCS) are all communicatively connected to the energy management module (EMS), which controls the hydrogen fuel cell module and energy storage battery module to work together to supply power to the load; the battery management module (BMS) is electrically connected to the energy storage battery module and is used to collect the status parameters of the energy storage battery module; the battery management module (BMS) is also electrically connected to the switching circuit, which, in the off-grid state and when the status parameters of the energy storage battery module are abnormal, directly disconnects the switching circuit to cut off the DC circuit between the energy storage battery module and the DC bus.

[0007] With the above structure, this utility model has the following advantages: This utility model discloses a hydrogen fuel cell-based energy storage system. A switching circuit is installed on the DC circuit between the energy storage battery module and the DC bus, and a hydrogen fuel cell switch is installed on the DC circuit between the hydrogen fuel cell module and the DC bus. This provides a switching structure for multiple DC power sources connected to the same DC bus. In off-grid mode, if the state parameters of the energy storage battery module become abnormal, the battery management system (BMS) directly disconnects the switching circuit to cut off the DC circuit between the energy storage battery module and the DC bus. This not only solves the overcharging and over-discharging problems of the energy storage battery module in off-grid mode but also allows for faster and more timely protection when the energy storage battery module malfunctions, thus ensuring the system's performance. The system ensures safety and reliability. Furthermore, in the event of a malfunction in the hydrogen fuel cell module, the system disconnects the hydrogen fuel cell switch, cutting off the DC circuit between the module and the DC bus. This guarantees system safety and reliability even during fuel cell failures, resulting in higher overall system safety and reliability. Additionally, the hydrogen fuel cell module serves as a backup power source for the energy storage system, extending the system's power supply time through collaborative operation with the energy storage battery module. Moreover, since the hydrogen fuel cell module and the energy storage battery module share the same DC bus, the battery module can provide DC power for the hydrogen fuel cell module's startup, while also resolving the charging issue for the battery module in off-grid mode.

[0008] Preferably, the high-voltage box also includes a DC / DC switching power supply. The energy storage battery module is electrically connected to the voltage input side of the DC / DC switching power supply, and the voltage output side of the DC / DC switching power supply is electrically connected to the battery management module (BMS). This configuration utilizes the energy storage battery module to power the BMS, thereby solving the problem of restarting the energy storage battery module in off-grid mode when the DC circuit of the energy storage battery module is disconnected and there is no external power supply, achieving self-starting and making it more reliable.

[0009] Preferably, the mains power is also electrically connected to the battery management module (BMS). This configuration allows the BMS to be powered by mains power, enabling it to operate with both AC and DC power supplies, thus improving its reliability.

[0010] Preferably, the switching circuit includes a circuit breaker, a fuse, a main positive contactor, a main negative contactor, a pre-charge contactor, and a pre-charge resistor. The positive terminal of the energy storage battery module is electrically connected to the positive terminal of the DC bus via the circuit breaker, fuse, and main positive contactor connected in series. The pre-charge contactor and pre-charge resistor are connected in series and then in parallel across the two ends of the main positive contactor. The negative terminal of the energy storage battery module is electrically connected to the negative terminal of the DC bus via the main negative contactor. The status parameters of the energy storage battery module include voltage parameters. The connection terminals of the fuse and the main positive contactor, and the connection terminals of the main negative contactor and the negative terminal of the energy storage battery module, are both electrically connected to the battery management module (BMS) for detecting the voltage parameters of the energy storage battery module. The BMS is electrically connected to the main positive and main negative contactors and is used to disconnect the main positive and main negative contactors when the voltage parameters of the energy storage battery module are abnormal. This switch structure requires few components, is simple in structure, and has low cost. Moreover, only two leads are needed to detect voltage parameters, thereby cutting off the switch circuit when the voltage is abnormal, so as to avoid overcharging or over-discharging of the energy storage battery module and ensure the safety and reliability of the system.

[0011] Preferably, the state parameters of the energy storage battery module also include current parameters. The switching circuit further includes a shunt electrically connected between the negative terminal of the energy storage battery module and the main negative contactor. The two ends of the shunt are electrically connected to the battery management module (BMS) and are used to disconnect the main positive contactor and the main negative contactor when the shunt detects an abnormality in the current parameters of the energy storage battery module. The shunt is used to divert the current in the circuit to its output terminal in a certain proportion, thereby enabling timely detection of abnormal conditions in the circuit (such as overload, short circuit, etc.) for protection, thus ensuring the safety and reliability of the system.

[0012] Preferably, a mains power switch is provided between the mains power supply and the energy storage converter PCS. This feature allows the mains power switch to be disconnected in case of mains power failure, further ensuring the safety and reliability of the system.

[0013] Preferably, an isolation transformer is also provided between the mains switch and the energy storage converter PCS. The isolation transformer serves to provide electrical isolation and interference immunity, which can further improve the safety and reliability of the system.

[0014] Preferably, after being electrically connected to the isolation transformer, the mains switch is also electrically connected to the load via an AC load switch. This arrangement ensures the safe use of the load through the AC load switch, further improving the safety and reliability of the system. Attached Figure Description

[0015] Figure 1 This is the electrical schematic diagram of the energy storage system of the hydrogen fuel cell of this utility model; Figure 2 This is a schematic diagram of the switching circuit of the energy storage system of the hydrogen fuel cell of this utility model; In the diagram: 1-Hydrogen fuel cell module, 2-Energy storage battery module, 3-Energy Management Module (EMS), 4-Energy Storage Converter (PCS), 5-High Voltage Box, 6-DC Bus, 7-Battery Management Module (BMS), 8-Switching Circuit, 9-Hydrogen Fuel Cell Switch, 10-Main Power, 11-Load, 12-DC / DC Switching Power Supply, 13-Main Power Switch, 14-Isolation Transformer, 15-AC Load Switch, QF-Circuit Breaker, FU-Fuse, RS-Shunt, FR-Pre-charge Resistor, K1-Main Positive Contactor, K2-Main Negative Contactor, K3-Pre-charge Contactor, B+-Positive terminal of Energy Storage Battery Module, B--Negative terminal of Energy Storage Battery Module, P+-Positive terminal of DC Bus, P--Negative terminal of DC Bus. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0017] An energy storage system containing a hydrogen fuel cell, such as Figure 1As shown, the system includes a hydrogen fuel cell module 1, an energy storage battery module 2, an energy management module (EMS) 3, an energy storage converter (PCS) 4, a high-voltage box 5, and a DC bus 6. The high-voltage box 5 includes a battery management module (BMS) 7 and a hydrogen fuel cell switch 9. The high-voltage box 5 also includes a switching circuit 8. The hydrogen fuel cell module 1 is electrically connected to the DC bus 6 via the hydrogen fuel cell switch 9. The energy storage battery module 2 is also electrically connected to the DC bus 6 via the high-voltage box 5. The DC bus 6 is electrically connected to the DC side of the energy storage converter (PCS4). The AC side of the energy storage converter (PCS4) is electrically connected to the mains power supply 10 to supply power to the load 11. 1. The battery management module BMS7 and the energy storage converter PCS4 are both communicatively connected to the energy management module EMS3, which is used to control the hydrogen fuel cell module 1 and the energy storage battery module 2 to work together to supply power to the load 11. The battery management module BMS7 is electrically connected to the energy storage battery module 2 and is used to collect the status parameters of the energy storage battery module 2. The battery management module BMS7 is also electrically connected to the switching circuit 8, which is used to directly disconnect the switching circuit 8 to cut off the DC circuit between the energy storage battery module 2 and the DC bus 6 when the status parameters of the energy storage battery module 2 are abnormal in the off-grid state.

[0018] In this embodiment, the energy storage system containing a hydrogen fuel cell has a switching circuit on the DC circuit between the energy storage battery module 2 and the DC bus 6, and a hydrogen fuel cell switch 9 on the DC circuit between the hydrogen fuel cell module 1 and the DC bus 6. This provides a switching structure for multiple DC power sources connected to the same DC bus 6. In off-grid mode, if the state parameters of the energy storage battery module 2 are abnormal, the battery management module (BMS7) directly disconnects the switching circuit 8 to cut off the DC circuit between the energy storage battery module 2 and the DC bus 6. This not only solves the overcharging and over-discharging problems of the energy storage battery module 2 in off-grid mode, but also allows for direct protection when the energy storage battery module 2 malfunctions, which is faster and more timely, thus ensuring the safety and reliability of the system. Similarly, if the hydrogen fuel cell module 1 malfunctions, the hydrogen fuel cell switch 9 will also be disconnected to cut off the DC circuit between the hydrogen fuel cell module 1 and the DC bus 6, thus ensuring the safety and reliability of the system even when the hydrogen fuel cell malfunctions. Therefore, the system has higher safety and reliability.

[0019] The high-voltage box 5 also includes a DC / DC switching power supply 12. The energy storage battery module 2 is electrically connected to the voltage input side of the DC / DC switching power supply 12, and the voltage output side of the DC / DC switching power supply 12 is electrically connected to the battery management module BMS7. This configuration utilizes the energy storage battery module 2 to power the battery management module BMS7, thereby solving the problem of restarting the energy storage battery module 2 when its DC circuit is disconnected and there is no external power supply in off-grid mode, enabling it to start automatically and making it more reliable.

[0020] The AC power supply 10 is also electrically connected to the battery management module (BMS7). This setup allows the AC power supply 10 to power the BMS7, enabling the BMS7 to operate with both AC and DC power, thus improving its reliability.

[0021] like Figure 2 As shown, the switching circuit 8 includes a circuit breaker QF, a fuse FU, a main positive contactor K1, a main negative contactor K2, a pre-charge contactor K3, and a pre-charge resistor FR. The positive terminal B+ of the energy storage battery module 2 is electrically connected to the positive terminal P+ of the DC bus 6 through the circuit breaker QF, the fuse FU, and the main positive contactor K1 connected in series. The pre-charge contactor K3 and the pre-charge resistor FR are connected in series and then in parallel across the two ends of the main positive contactor K1. The negative terminal B- of the energy storage battery module 2 is electrically connected to the negative terminal P- of the DC bus 6 through the main negative contactor K2. The status parameters of the energy storage battery module 2 include voltage parameters. The connection terminals of the fuse FU and the main positive contactor K1, and the connection terminals of the main negative contactor K2 and the negative terminal B- of the energy storage battery module 2 are both electrically connected to the battery management module BMS7 for detecting the voltage parameters of the energy storage battery module 2. The battery management module BMS7 is connected to the main positive contactor K1 and the main negative contactor K2. 2. Electrical connection, used to disconnect the main positive contactor K1 and the main negative contactor K2 when the voltage parameters of the energy storage battery module 2 are abnormal; the electrical connection between the energy storage battery module 2 and the voltage input side of the DC / DC switching power supply 12 means that the positive terminal B+ and the negative terminal B- of the energy storage battery module 2 are electrically connected to the voltage input side of the DC / DC switching power supply 12; the electrical connection between the battery management module BMS7 and the main positive contactor K1 and the main negative contactor K2 means that the battery management module BMS7 is electrically connected to the coil of the main positive contactor K1 and the coil of the main negative contactor K2; the contact switch connected between the positive terminal B+ of the energy storage battery module 2 and the positive terminal P+ of the DC bus 6 is the contact switch of the main positive contactor K1, which is normally open in this embodiment, and the contact switch connected between the negative terminal B- of the energy storage battery module 2 and the negative terminal P- of the DC bus 6 is the contact switch of the main negative contactor K2, which is also normally open in this embodiment. This switch structure requires few components, is simple in structure, and has low cost. Moreover, only two leads are needed to detect voltage parameters, thereby cutting off the switch circuit 8 when the voltage is abnormal, so as to avoid overcharging or over-discharging of the energy storage battery module 2 and ensure the safety and reliability of the system.

[0022] The status parameters of the energy storage battery module 2 also include current parameters. The switching circuit 8 also includes a shunt RS electrically connected between the negative terminal B- of the energy storage battery module 2 and the main negative contactor K2. The two ends of the shunt RS are electrically connected to the battery management module BMS7, which is used to disconnect the main positive contactor K1 and the main negative contactor K2 when the shunt RS detects an abnormal current parameter of the energy storage battery module 2. After the shunt RS is set, the connection terminals of the fuse FU and the main positive contactor K1 and the main negative contactor K2 and the shunt RS are electrically connected to the battery management module BMS7 for detecting the voltage parameters of the energy storage battery module 2. The shunt RS is used to divert the current in the circuit to the output terminal of the shunt RS in a certain proportion, so that abnormal conditions in the circuit (such as overload, short circuit, etc.) can be detected in time for protection, thereby ensuring the safety and reliability of the system.

[0023] A mains power switch 13 is provided between the mains power supply 10 and the energy storage converter PCS4. This setting can disconnect the mains power switch 13 in case of an abnormality in the mains power supply 10, further ensuring the safety and reliability of the system.

[0024] An isolation transformer 14 is also provided between the mains switch 13 and the energy storage converter PCS4. The isolation transformer 14 plays a role in electrical isolation and anti-interference, which can further improve the safety and reliability of the system.

[0025] After being electrically connected to the isolation transformer 14, the mains switch 13 is also electrically connected to the load 11 via the AC load switch 15. This setup ensures the safe use of the load 11 through the AC load switch 15, further improving the safety and reliability of the system.

[0026] Energy storage converter PCS4: It is a conversion device between the energy storage system and the mains power 10; it can charge and discharge the energy storage system, and can both invert the DC power of the energy storage system into AC power that can be connected to the mains power 10, and rectify the AC power of the mains power 10 into DC power that can be charged into the energy storage system.

[0027] Battery Management Module (BMS7): Intelligently manages and maintains each battery cell, monitors battery status, and prevents overcharging and over-discharging to extend battery life.

[0028] Energy Management Module (EMS3): This is the energy scheduling and management center of the energy storage system. It communicates in real time with the Battery Management System (BMS), Energy Storage Converter (PCS4), circuit power meter, manageable load devices, and peripheral devices to collect important data from all communication substations. Through data acquisition, processing, and analysis, and after internal program logic calculations, it controls the orderly and stable operation of the entire energy storage system.

[0029] DC / DC switching power supply 12: is a power conversion device used to convert one level of DC voltage to another level of DC voltage.

[0030] The working principle of the energy storage system containing a hydrogen fuel cell in this embodiment is as follows: When the mains power supply 10 is normal, the energy storage inverter PCS4 operates in grid-connected mode. The mains power supply 10 can charge the energy storage battery module 2 through the inverter PCS4, and the energy storage battery module 2 can also be inverted into AC power by the inverter PCS4 and connected to the mains power supply 10. The inverter PCS4 controls the charging and discharging of the energy storage battery module 2. If the mains power supply 10 malfunctions, the inverter PCS4 operates in off-grid mode. The energy management module EMS3 controls the hydrogen fuel cell module 1 and the energy storage battery module 2 to work together to supply power to the load 11. When the energy management module EMS3 detects an anomaly in the energy storage battery module through the battery management module BMS7... When the battery is sufficiently charged, a command is sent to the battery management module (BMS7), which controls the switching circuit 8 to turn on. The energy storage battery module 2 is connected to the DC bus 6 and supplies power to the load 11 independently. At this time, the hydrogen fuel cell switch 9 is open, and the hydrogen fuel cell module 1 is in a shutdown state. When the energy management module (EMS3) detects that the energy storage battery module 2 is low on power through the battery management module (BMS7), the EMS3 sends a command to the hydrogen fuel cell module 1. The hydrogen fuel cell module 1 then controls the hydrogen fuel cell switch 9 to turn on, and the energy storage battery module 2 on the same DC bus 6 provides DC power for the startup of the hydrogen fuel cell module 1. When the output voltage of hydrogen fuel cell module 1 exceeds that of energy storage battery module 2 after operating for a period of time, hydrogen fuel cell module 1 supplies power to load 11 and charges energy storage battery module 2. In off-grid mode, regardless of whether energy storage battery module 2 supplies power to load 11 or acts as a DC load, if battery management module BMS7 detects abnormal state parameters of energy storage battery module 2, BMS7 directly disconnects switch circuit 8, cutting off the DC circuit between energy storage battery module 2 and DC bus 6. This prevents energy storage battery module 2 from being overcharged or over-discharged, ensuring the safety and reliability of the system. However, once the hydrogen fuel cell module 1's output voltage exceeds that of energy storage battery module 2, the system will continue to operate normally. When battery module 1 malfunctions, the DC circuit between battery module 1 and DC bus 6 will be cut off by disconnecting the hydrogen fuel cell switch 9, thus ensuring the safety and reliability of the system even when the hydrogen fuel cell malfunctions. When battery module 2 returns to normal, the energy management module EMS3 sends a command to the battery management module BMS7, which controls the switch circuit 8 to close, restarting battery module 2. When hydrogen fuel cell module 1 returns to normal, the energy management module EMS3 sends a command to hydrogen fuel cell module 1, which controls the hydrogen fuel cell switch 9 to close, restarting hydrogen fuel cell module 1.

Claims

1. An energy storage system containing a hydrogen fuel cell, comprising a hydrogen fuel cell module (1), an energy storage battery module (2), an energy management module (EMS) (3), an energy storage converter (PCS) (4), a high-voltage box (5), and a DC bus (6), wherein the high-voltage box (5) includes a battery management module (BMS) (7); characterized in that: It also includes a hydrogen fuel cell switch (9), and the high-voltage box (5) also includes a switch circuit (8). The hydrogen fuel cell module (1) is electrically connected to the DC bus (6) through the hydrogen fuel cell switch (9). The energy storage battery module (2) is also electrically connected to the DC bus (6) through the high-voltage box (5). The DC bus (6) is electrically connected to the DC side of the energy storage converter PCS (4). The AC side of the energy storage converter PCS (4) is electrically connected to the mains power (10) to supply power to the load (11). The hydrogen fuel cell module (1), the battery management module BMS (7) and the energy storage converter PCS (4) are all connected to the energy management module. The EMS (3) communication connection is used to control the hydrogen fuel cell module (1) and the energy storage battery module (2) to work together to supply power to the load (11) by the energy management module EMS (3); the battery management module BMS (7) is electrically connected to the energy storage battery module (2) and is used to collect the status parameters of the energy storage battery module (2); the battery management module BMS (7) is electrically connected to the switch circuit (8) and is used to directly disconnect the switch circuit (8) to cut off the DC circuit between the energy storage battery module (2) and the DC bus (6) when the status parameters of the energy storage battery module (2) are abnormal in the off-grid state.

2. The energy storage system containing a hydrogen fuel cell according to claim 1, characterized in that: The high-voltage box (5) also includes a DC / DC switching power supply (12), the energy storage battery module (2) is electrically connected to the voltage input side of the DC / DC switching power supply (12), and the voltage output side of the DC / DC switching power supply (12) is electrically connected to the battery management module (BMS) (7).

3. The energy storage system containing a hydrogen fuel cell according to claim 2, characterized in that: The mains power (10) is also electrically connected to the battery management module (BMS) (7).

4. The energy storage system containing a hydrogen fuel cell according to claim 1, characterized in that: The switching circuit (8) includes a circuit breaker QF, a fuse FU, a main positive contactor K1, a main negative contactor K2, a pre-charge contactor K3, and a pre-charge resistor FR; the positive terminal B+ of the energy storage battery module (2) is electrically connected to the positive terminal P+ of the DC bus (6) through the circuit breaker QF, the fuse FU, and the main positive contactor K1 connected in series; the pre-charge contactor K3 and the pre-charge resistor FR are connected in series and then in parallel across the two ends of the main positive contactor K1; the negative terminal B- of the energy storage battery module (2) is electrically connected to the DC bus (6) through the main negative contactor K2. The negative terminal P-; the state parameters of the energy storage battery module (2) include voltage parameters. The connection terminals of the fuse FU and the main positive contactor K1 and the main negative contactor K2 and the negative terminal B- of the energy storage battery module (2) are electrically connected to the battery management module BMS (7) to detect the voltage parameters of the energy storage battery module (2). The battery management module BMS (7) is electrically connected to the main positive contactor K1 and the main negative contactor K2 to disconnect the main positive contactor K1 and the main negative contactor K2 when the voltage parameters of the energy storage battery module (2) are abnormal.

5. The energy storage system containing a hydrogen fuel cell according to claim 4, characterized in that: The state parameters of the energy storage battery module (2) also include current parameters. The switching circuit (8) also includes a shunt RS electrically connected between the negative terminal B- of the energy storage battery module (2) and the main negative contactor K2. The two ends of the shunt RS are electrically connected to the battery management module BMS (7) and are used to disconnect the main positive contactor K1 and the main negative contactor K2 when the shunt RS detects an abnormal current parameter of the energy storage battery module (2).

6. The energy storage system containing a hydrogen fuel cell according to claim 1, characterized in that: A mains switch (13) is provided between the mains power (10) and the energy storage converter PCS (4).

7. The energy storage system containing a hydrogen fuel cell according to claim 6, characterized in that: An isolation transformer (14) is also provided between the mains switch (13) and the energy storage converter PCS (4).

8. The energy storage system containing a hydrogen fuel cell according to claim 7, characterized in that: After the mains switch (13) is electrically connected to the isolation transformer (14), it is also electrically connected to the load (11) through the AC load switch (15).

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