A high-efficiency discharge energy storage system and discharge method thereof

Abstract

The present invention discloses an energy storage system with high efficiency discharge and a discharge method thereof, including an energy storage converter, a dual-source power supply switching power supply, an energy storage battery and internal auxiliary equipment of the system; the AC end of the energy storage converter is connected to the power grid, and the DC end is connected to the energy storage battery; the dual-source power supply switching power supply includes an AC input interface, a DC input interface and a DC output interface, and the AC input interface and the DC input interface are respectively connected to the AC end and the DC end of the energy storage converter, and the DC output interface is connected to the internal auxiliary equipment of the system. The present invention controls the dual-source power supply switching power supply, uses DC power supply when the energy storage battery is discharged, and uses AC power supply when the energy storage battery is charged, which can effectively reduce the power loss of the auxiliary equipment and improve the overall discharge efficiency, and the auxiliary equipment inside the system is all powered by DC, which effectively reduces the battery interference of the equipment and avoids electric shock accidents.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a highly efficient discharging energy storage system and a discharging method thereof. Background Art

[0002] With the continuous development of the energy storage market, more and more users or enterprises are using energy storage systems to reduce electricity costs. However, due to the high cost of energy storage systems, the payback period of the entire investment becomes longer. Therefore, how to improve the discharge efficiency of energy storage systems has gradually become a problem that needs to be solved urgently.

[0003] The existing technology uses AC systems to improve the discharge efficiency of energy storage systems. However, due to the presence of multiple transformers and current converters in the AC system, the electromagnetic interference is large. At the same time, the AC system has many levels, which can easily lead to low overall energy efficiency. In addition, the auxiliary power supply of the energy storage system also uses an AC distribution system, which has low safety. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an energy storage system with high efficiency discharge and a discharge method thereof, so as to effectively reduce the power loss and electromagnetic interference of auxiliary equipment, improve the overall discharge efficiency and ensure the safety of auxiliary power supply.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An energy storage system with high efficiency discharge includes an energy storage converter, a dual-source power supply switching power supply, an energy storage battery and internal auxiliary equipment of the system;

[0007] The AC end of the energy storage converter is connected to the power grid, and the DC end is connected to the energy storage battery;

[0008] The dual-source power supply switching power supply includes an AC input interface, a DC input interface and a DC output interface, and the AC input interface and the DC input interface are respectively connected to the AC end and the DC end of the energy storage inverter, and the DC output interface is connected to the internal auxiliary equipment of the system.

[0009] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0010] A high-efficiency discharge method for an energy storage system, using the above-mentioned high-efficiency discharge energy storage system, is implemented including the following control steps:

[0011] S1. Controlling the energy storage converter through the energy management subsystem EMS to convert the AC power of the power grid into DC power to charge the energy storage battery, or converting the electric energy stored in the energy storage battery into AC power to release to the power grid;

[0012] S2. Control the dual-source power supply switching power supply through the energy management subsystem EMS to convert the AC power of the power grid into 24V DC power through the AC input interface and then output it through the DC output interface to the auxiliary equipment inside the system for power consumption, or transform the electric energy stored in the energy storage battery into 24V DC power and then output it through the DC output interface to the auxiliary equipment inside the system for power consumption.

[0013] The beneficial effects of the present invention are as follows: the present invention provides an energy storage system with high efficiency discharge and a discharge method thereof, by replacing the power supply scheme of an uninterruptible power supply plus a DC switching power supply in an existing energy storage system with a dual-source power supply switching power supply, and using a dual interface mode of an AC input interface and a DC input interface to realize that when the system is charged, the AC power of the power grid is input into the dual-source power supply switching power supply through the AC input interface of the dual-source power supply switching power supply, converted into DC power, and then output to the system internal auxiliary equipment through the DC output interface to power supply, thereby reducing the energy consumption of the energy storage battery; and when the system is discharged, that is, when the network is disconnected, the electric energy of the energy storage battery is input into the dual-source power supply switching power supply through the DC input interface of the dual-source power supply switching power supply, transformed, and then output to 24V DC power, and then output to the system internal auxiliary equipment through the DC output interface to power supply, that is, by controlling the dual-source power supply switching power supply, using DC power supply when the energy storage battery is discharged, and using AC power supply when the energy storage battery is charged, the power loss of the auxiliary equipment can be effectively reduced, and the overall discharge efficiency can be improved; and the auxiliary equipment inside the system is all powered by DC, which effectively reduces the battery interference of the equipment and avoids electric shock accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the architecture diagram of the existing energy storage system;

[0015] Figure 2 A system architecture diagram of a high-efficiency discharge energy storage system according to an embodiment of the present invention;

[0016] Figure 3 This is an architecture diagram of a dual-source power supply switching power supply in a high-efficiency discharge energy storage system according to an embodiment of the present invention;

[0017] Figure 4 The present invention is a flowchart of a high-efficiency discharge method for an energy storage system according to an embodiment of the present invention.

[0018] Description of labels:

[0019] 1. Energy storage converter; 2. Energy storage battery; 3. Dual-source power supply switching power supply; 31. DC input interface; 32. AC input interface; 33. DC output interface; 34. DCDC module; 35. Rectifier module; K1, first relay; K2, second relay; 36. Main control board; 361. Communication interface;

[0020] 4. System internal auxiliary equipment; 41. Thermal management system; 42. Lighting system; 43. Fire protection system;

[0021] EMS, energy management subsystem; UPS, uninterruptible power supply;

[0022] 5. DC switching power supply; 6. Main control system. DETAILED DESCRIPTION

[0023] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0024] Please refer to Figure 2 and Figure 3 , an energy storage system with high efficiency discharge, including an energy storage converter, a dual-source power supply switching power supply, an energy storage battery and internal auxiliary equipment of the system;

[0025] The AC end of the energy storage converter is connected to the power grid, and the DC end is connected to the energy storage battery;

[0026] The dual-source power supply switching power supply includes an AC input interface, a DC input interface and a DC output interface, and the AC input interface and the DC input interface are respectively connected to the AC end and the DC end of the energy storage inverter, and the DC output interface is connected to the internal auxiliary equipment of the system.

[0027] As can be seen from the above description, the beneficial effects of the present invention are as follows: by replacing the power supply scheme of the uninterruptible power supply plus the DC switching power supply in the existing energy storage system with the dual-source power supply switching power supply, the AC power of the power grid is input into the dual-source power supply switching power supply through the AC input interface of the dual-source power supply switching power supply through the dual-source power supply switching power supply to be converted into DC power and then output to the system internal auxiliary equipment through the DC output interface when the system is charging, thereby reducing the energy consumption of the energy storage battery; and when the system is discharged, that is, when the network is disconnected, the electric energy of the energy storage battery is input into the dual-source power supply switching power supply through the DC input interface of the dual-source power supply switching power supply to be transformed and then output to 24V DC power and then output to the system internal auxiliary equipment through the DC output interface to power the system, that is, by controlling the dual-source power supply switching power supply, DC power supply is used when the energy storage battery is discharged, and AC power supply is used when the energy storage battery is charged, thereby effectively reducing the power loss of the auxiliary equipment and improving the overall discharge efficiency, and the auxiliary equipment inside the system is all powered by DC, thereby effectively reducing the battery interference of the equipment and avoiding electric shock accidents.

[0028] Furthermore, the dual-source power supply switching power supply further includes a DCDC module, a rectifier module, a first relay and a second relay;

[0029] The DCDC module and the first relay are sequentially connected in series between the DC input interface and the DC output interface;

[0030] The rectifier module and the second relay are connected in series between the AC input interface and the DC output interface in sequence.

[0031] From the above description, it can be seen that the DCDC module is used to realize the voltage transformation output of the energy storage battery electric energy when the system is discharged to supply the power to the auxiliary equipment inside the system, and the rectifier module is used to realize the conversion of the AC power of the grid into DC power output when the system is charged to supply the auxiliary equipment inside the system. At the same time, the first relay and the second relay are used as switches to realize the switching of the power supply mode of the auxiliary equipment inside the system in the discharge mode and the charging mode, thereby further improving the overall discharge efficiency.

[0032] Furthermore, it also includes an energy management subsystem EMS;

[0033] The energy management subsystem EMS is in communication control connection with the energy storage converter, the energy storage battery, the dual-source power supply switching power supply and the auxiliary load inside the system.

[0034] From the above description, it can be seen that the energy management subsystem EMS is used as the control core to ensure the overall control performance of the system.

[0035] Furthermore, the dual-source power supply switching power supply also includes a main control board;

[0036] The main control board is control-connected to the first relay and the second relay, and a communication interface is integrated on the main control board, and the communication interface is communicatively connected to the energy management subsystem EMS.

[0037] As can be seen from the above description, the closing and opening of the first relay and the second relay are controlled by the main control board of the dual-source power supply switching power supply itself by receiving instructions issued by the EMS, ensuring that the control strategy responds in a timely manner.

[0038] Furthermore, the auxiliary loads inside the system include a thermal management system, a lighting system and a fire protection system.

[0039] From the above description, it can be seen that the auxiliary loads inside the system are all powered by DC, which effectively reduces electromagnetic interference. The thermal management system can ensure that the temperature of the entire system is within the normal use range, ensuring the safe and reliable operation of the system and extending the operating life of the system. The lighting system can improve the lighting conditions for the maintenance and operation of the entire system. The fire protection system is responsible for emergency handling of fires in the entire system to ensure the safety of the system. The three auxiliary equipment effectively ensure the overall performance and safety of the system.

[0040] Please refer to Figure 4 A high-efficiency discharge method of an energy storage system, using the above-mentioned high-efficiency discharge energy storage system, includes the following control steps:

[0041] S1. Controlling the energy storage converter through the energy management subsystem EMS to convert the AC power of the power grid into DC power to charge the energy storage battery, or converting the electric energy stored in the energy storage battery into AC power to release to the power grid;

[0042] S2. Control the dual-source power supply switching power supply through the energy management subsystem EMS to convert the AC power of the power grid into 24V DC power through the AC input interface and then output it to the auxiliary load inside the system through the DC output interface, or transform the electric energy stored in the energy storage battery into 24V DC power and then output it to the auxiliary load inside the system through the DC output interface.

[0043] As can be seen from the above description, the beneficial effects of the present invention are as follows: based on the same technical concept, using the above-mentioned energy storage system with high efficiency discharge, a high efficiency discharge method is provided, by replacing the power supply scheme of the uninterruptible power supply plus the DC switching power supply in the existing energy storage system with the dual-source power supply switching power supply, and realizing the dual interface mode of the AC input interface and the DC input interface when the system is charged, the AC power of the power grid is input into the dual-source power supply switching power supply through the AC input interface of the dual-source power supply switching power supply, converted into DC power, and then output to the system internal auxiliary equipment through the DC output interface to power supply, thereby reducing the energy consumption of the energy storage battery, and when the system is discharged, that is, when the network is disconnected, the electric energy of the energy storage battery is input into the dual-source power supply switching power supply through the DC input interface of the dual-source power supply switching power supply, and then 24V DC power is output to the system internal auxiliary equipment through the DC output interface to power supply, that is, by controlling the dual-source power supply switching power supply, DC power supply is used when the energy storage battery is discharged, and AC power supply is used when the energy storage battery is charged, which can effectively reduce the power loss of the auxiliary equipment and improve the overall discharge efficiency, and the auxiliary equipment inside the system is all powered by DC, which effectively reduces the battery interference of the equipment and avoids electric shock accidents.

[0044] Furthermore, a DCDC module and a first relay are connected in series between the DC input interface and the DC output interface of the dual-source power supply switching power supply, a rectifier module and a second relay are connected in series between the AC input interface and the DC output interface, and both the first relay and the second relay are connected to the energy management subsystem EMS for communication and control through a main control board;

[0045] The step S2 is specifically as follows:

[0046] The energy management subsystem EMS sends a charging instruction to the main control board through the communication interface of the main control board, and the main control board controls the second relay to close and the first relay to disconnect, inputs the AC power of the power grid into the rectifier module through the AC input interface, and controls the rectifier module to convert the AC power into 24V DC power and then output it to the auxiliary load inside the system through the DC output interface;

[0047] Or a discharge instruction is sent to the main control board through the communication interface of the main control board, and the main control board controls the first relay to close and the second relay to disconnect, and the electric energy stored in the energy storage battery is input into the DCDC module through the DC input interface, and the DCDC DC module is controlled to transform the electric energy stored in the energy storage battery into 24V DC and then output it through the DC output interface to the auxiliary load inside the system for power consumption.

[0048] From the above description, it can be seen that the DCDC module is used to realize the voltage transformation output of the energy storage battery electric energy when the system is discharged to supply the power to the auxiliary equipment inside the system, and the rectifier module is used to realize the conversion of the AC power of the power grid into DC power output when the system is charged to supply the power to the auxiliary equipment inside the system. At the same time, the first relay and the second relay are used as switches to realize the switching of the power supply mode of the auxiliary equipment inside the system in the discharge mode and the charging mode, thereby further improving the overall discharge efficiency. At the same time, the closing and opening of the first relay and the second relay are controlled by the main control board of the dual-source power supply switching power supply itself by receiving the instructions issued by the EMS, thereby ensuring the timely response of the control strategy.

[0049] The present invention provides an energy storage system with high efficiency discharge and a discharge method thereof, which are applicable to various scenarios where the energy storage system is used for electricity consumption. The following is a detailed description in conjunction with an embodiment.

[0050] Please refer to Figure 1 and Figure 2 , Embodiment 1 of the present invention is:

[0051] An energy storage system with high discharge efficiency, such as Figure 2 As shown, it includes an energy storage converter 1, a dual-source power supply switching power supply 3, an energy storage battery 2 and system internal auxiliary equipment 4.

[0052] Among them, the AC end of the energy storage inverter 1 is connected to the power grid, and the DC end is connected to the energy storage battery 2; at the same time, the dual-source power supply switching power supply 3 includes an AC input interface 32, a DC input interface 31 and a DC output interface 33, and the AC input interface 32 and the DC input interface 31 are respectively connected to the AC end and the DC end of the energy storage inverter 1, and the DC output interface 33 is connected to the internal auxiliary equipment 4 of the system.

[0053] Among them, Figure 1 The following is the architecture diagram of the existing energy storage system. Figure 1 It can be seen that the existing energy storage system usually adopts an uninterruptible power supply UPS in conjunction with a DC switching power supply 5 to provide DC power to the main control system 6 inside the system to ensure the normal operation of the system in the event of a power outage in the power grid, while other internal auxiliary equipment such as the thermal management system 41 and the lighting system 42 are directly powered by the AC power of the power grid. Under normal conditions of the AC power grid, since the auxiliary equipment uses an AC system, there are multiple transformers and current converters, which are prone to electromagnetic interference, and the system has many levels, which makes the overall charging and discharging energy efficiency of the system low. At the same time, the power supply of the auxiliary equipment uses an AC distribution method, which has low safety.

[0054] In the present embodiment, the power supply scheme of the uninterruptible power supply UPS plus the DC switching power supply 5 in the existing energy storage system is replaced with the dual-source power supply switching power supply 3, which effectively simplifies the auxiliary power supply level of the system and reduces the loss of the auxiliary equipment. Then, the AC input interface 32 and the DC input interface 31 are used in a dual-interface manner to realize that when the system is charged, the AC power of the power grid is input into the dual-source power supply switching power supply 3 through the AC input interface 32 of the dual-source power supply switching power supply 3, and then converted into DC power, which is then output through the DC output interface 33 to power the auxiliary equipment 4 inside the system, thereby reducing the energy consumption of the energy storage battery 2 and reducing the energy consumption of the energy storage battery 2. When the system is discharged, that is, when the network is disconnected, the electric energy of the energy storage battery 2 is input into the dual-source power supply switching power supply 3 through the DC input interface 31 of the dual-source power supply switching power supply 3 for voltage transformation and then output to 24V DC, which is then output through the DC output interface 33 to power the auxiliary equipment 4 inside the system. That is, by controlling the dual-source power supply switching power supply 3, DC power supply is used when the energy storage battery 2 is discharged, and AC power supply is used when the energy storage battery 2 is charged, which can effectively reduce the power loss of the auxiliary equipment and improve the overall discharge efficiency. In addition, the auxiliary equipment 4 inside the system are all powered by DC, which effectively reduces the battery interference of the equipment and avoids electric shock accidents.

[0055] In addition, in this embodiment, Figure 2 As shown, the auxiliary loads inside the system include a thermal management system 41, a lighting system 42 and a fire protection system 43. That is, the auxiliary loads inside the system are all powered by direct current, which effectively reduces electromagnetic interference. The thermal management system 41 can ensure that the temperature of the entire system is within the normal use range, ensure the safe and reliable operation of the system, and extend the operating life of the system; the lighting system 42 can improve the lighting conditions for the maintenance and operation of the entire system; the fire protection system 43 is responsible for the emergency treatment of fires in the entire system to ensure the safety of the system; the three auxiliary devices effectively ensure the overall performance and safety of the system.

[0056] Please refer to Figure 2 and Figure 3 , Embodiment 2 of the present invention is:

[0057] A highly efficient discharge energy storage system, based on the above embodiment 1, in this embodiment, as Figure 3 As shown, the dual-source power supply switching power supply 3 further includes a DCDC module 34 , a rectifier module 35 , a first relay K1 and a second relay K2 .

[0058] The DCDC module 34 and the first relay K1 are connected in series between the DC input interface 31 and the DC output interface 33 , and the rectifier module 35 and the second relay K2 are connected in series between the AC input interface 32 and the DC output interface 33 .

[0059] That is, in the present embodiment, the DCDC module 34 is used to realize the voltage transformation output of the electric energy of the energy storage battery 2 when the system is discharged to supply the power to the auxiliary equipment 4 inside the system, and the rectifier module 35 is used to realize the conversion of the AC power of the power grid into the DC power output when the system is charged to supply the auxiliary equipment 4 inside the system, and at the same time, the first relay K1 and the second relay K2 are used as switches to realize the switching of the power supply mode of the auxiliary equipment 4 inside the system between the discharge mode and the charging mode, so as to further improve the overall discharge efficiency.

[0060] At the same time Figure 2 As shown, in this embodiment, an energy management subsystem EMS is also included, and the energy management subsystem EMS is connected to the energy storage converter 1, the energy storage battery 2, the dual-source power supply switching power supply 3 and the auxiliary load inside the system for communication control. That is, the energy management subsystem EMS is used as the control core to ensure the overall control performance of the system.

[0061] In addition, Figure 2 As shown, in this embodiment, the dual-source power supply switching power supply 3 further includes a main control board 36. The main control board 36 is connected to the first relay K1 and the second relay K2, and a communication interface 361 is integrated on the main control board 36, and the communication interface 361 is connected to the energy management subsystem EMS. That is, the closing and opening of the first relay K1 and the second relay K2 are controlled by the main control board 36 of the dual-source power supply switching power supply 3 itself by receiving instructions issued by the EMS, ensuring that the control strategy responds in a timely manner.

[0062] Please refer to Figure 4 , Embodiment 3 of the present invention is:

[0063] A high-efficiency discharge method for an energy storage system, using a high-efficiency discharge energy storage system in the above-mentioned embodiment 1 or embodiment 2, such as Figure 4 As shown, the implementation includes the following control steps:

[0064] S1. The energy management subsystem EMS controls the energy storage converter to convert the AC power of the grid into DC power to charge the energy storage battery, or converts the electric energy stored in the energy storage battery into AC power to release to the grid.

[0065] S2. Control the dual-source power supply switching power supply through the energy management subsystem EMS to convert the AC power of the power grid into 24V DC power through the AC input interface and then output it to the auxiliary load inside the system through the DC output interface, or transform the electric energy stored in the energy storage battery into 24V DC power and then output it to the auxiliary load inside the system through the DC output interface.

[0066] That is, in this embodiment, based on the same technical concept, a high-efficiency discharge method of an energy storage system is provided for an energy storage system with high-efficiency discharge of the above-mentioned embodiment 1 or embodiment 2. By replacing the power supply scheme of the uninterruptible power supply plus the DC switching power supply in the existing energy storage system with the dual-source power supply switching power supply, the AC power of the power grid is input into the dual-source power supply switching power supply through the AC input interface of the dual-source power supply switching power supply through the dual-source power supply switching power supply, converted into DC power, and then output to the system internal auxiliary equipment through the DC output interface when the system is charged, thereby reducing the energy consumption of the energy storage battery. When the system is discharged, that is, when the network is disconnected, the electric energy of the energy storage battery is input into the dual-source power supply switching power supply through the DC input interface of the dual-source power supply switching power supply, and then 24V DC power is output to the system internal auxiliary equipment through the DC output interface. That is, by controlling the dual-source power supply switching power supply, DC power is used when the energy storage battery is discharged, and AC power is used when the energy storage battery is charged, which can effectively reduce the power loss of the auxiliary equipment and improve the overall discharge efficiency. In addition, the auxiliary equipment inside the system is all powered by DC, which effectively reduces the battery interference of the equipment and avoids electric shock accidents.

[0067] At the same time, in this embodiment, a DCDC module and a first relay are connected in series between the DC input interface and the DC output interface of the dual-source power supply switching power supply, and a rectifier module and a second relay are connected in series between the AC input interface and the DC output interface. The first relay and the second relay are both connected to the energy management subsystem EMS for communication and control through a main control board.

[0068] Then step S2 is specifically:

[0069] The energy management subsystem EMS sends a charging instruction to the main control board through the communication interface of the main control board. The main control board controls the second relay to close and the first relay to disconnect, inputs the AC power of the power grid into the rectifier module through the AC input interface, and controls the rectifier module to convert the AC power into 24V DC power, which is then output through the DC output interface to the auxiliary load inside the system.

[0070] Or send a discharge command to the main control board through the communication interface of the main control board, and the main control board controls the first relay to close and the second relay to disconnect, input the electric energy stored in the energy storage battery into the DCDC module through the DC input interface, and control the DCDC DC module to transform the electric energy stored in the energy storage battery into 24V DC and then output it to the auxiliary load inside the system through the DC output interface.

[0071] That is, the DCDC module is used to transform the energy storage battery's electric energy when the system is discharged to supply power to the auxiliary equipment inside the system. The rectifier module is used to convert the AC power of the power grid into DC power output when the system is charged to supply power to the auxiliary equipment inside the system. At the same time, the first relay and the second relay are used as switches to realize the switching of the power supply mode of the auxiliary equipment inside the system between the discharge mode and the charging mode, thereby further improving the overall discharge efficiency. At the same time, the closing and opening of the first relay and the second relay are controlled by the main control board of the dual-source power supply switching power supply itself by receiving the instructions issued by the EMS, thereby ensuring the timely response of the control strategy.

[0072] In summary, the present invention provides an energy storage system with high efficiency discharge and a discharge method thereof, which have the following beneficial effects:

[0073] 1. Simplified the system auxiliary power supply level and reduced the loss of auxiliary equipment;

[0074] 2. By controlling the dual-source power supply switch, DC power is used when the energy storage battery is discharged, and AC power is used when the energy storage battery is charged, effectively reducing the power loss of auxiliary equipment;

[0075] 3. All auxiliary equipment is powered by DC, which effectively reduces battery interference of the equipment and avoids electric shock accidents.

[0076] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A high-efficiency discharge method for an energy storage system, characterized in that: A highly efficient energy storage system is used, which includes an energy storage converter, a dual-source switching power supply, an energy storage battery, system internal auxiliary equipment and an energy management subsystem EMS; The AC end of the energy storage converter is connected to the power grid, and the DC end is connected to the energy storage battery; The dual-source power supply switching power supply includes an AC input interface, a DC input interface and a DC output interface, and the AC input interface and the DC input interface are respectively connected to the AC end and the DC end of the energy storage converter, and the DC output interface is connected to the auxiliary equipment inside the system; The dual-source power supply switching power supply also includes a DCDC module, a rectifier module, a first relay and a second relay; The DCDC module and the first relay are sequentially connected in series between the DC input interface and the DC output interface; The rectifier module and the second relay are sequentially connected in series between the AC input interface and the DC output interface; The first relay is used to close when the system is discharged, that is, when the energy storage converter is not working in the off-grid state, so that the DCDC module works to transform the electric energy of the energy storage battery and output it to supply power to the auxiliary equipment inside the system, so that the power consumption of the auxiliary equipment inside the system is supplied by the energy storage battery in the off-grid state; The second relay is used to close during the system charging, that is, the energy storage converter works to convert the grid AC power into DC power and outputs it to the energy storage battery for charging, so that the rectifier module works to convert the grid AC power into DC power and outputs it to supply power to the auxiliary equipment inside the system, so as to realize the synchronous charging of the energy storage battery and the power consumption of the auxiliary equipment inside the system without interfering with each other during the system charging; The energy management subsystem EMS is in communication and control connection with the energy storage converter, the energy storage battery, the dual-source power supply switching power supply and the auxiliary equipment inside the system; The dual-source power supply switching power supply also includes a main control board; The main control board is control-connected to the first relay and the second relay, and a communication interface is integrated on the main control board, and the communication interface is communicatively connected to the energy management subsystem EMS; The system implementation includes the following control steps: S1. Controlling the energy storage converter through the energy management subsystem EMS to convert the AC power of the power grid into DC power to charge the energy storage battery, or converting the electric energy stored in the energy storage battery into AC power to release to the power grid; S2, controlling the dual-source power supply switch power supply through the energy management subsystem EMS to convert the AC power of the power grid into 24V DC power through the AC input interface and then output it to the auxiliary equipment inside the system through the DC output interface, or transforming the electric energy stored in the energy storage battery into 24V DC power and then outputting it to the auxiliary equipment inside the system through the DC output interface; A DCDC module and a first relay are connected in series between the DC input interface and the DC output interface of the dual-source power supply switching power supply, a rectifier module and a second relay are connected in series between the AC input interface and the DC output interface, and both the first relay and the second relay are connected to the energy management subsystem EMS for communication and control via a main control board; The step S2 is specifically as follows: The energy management subsystem EMS sends a charging instruction to the main control board through the communication interface of the main control board, and the main control board controls the second relay to close and the first relay to disconnect, inputs the AC power of the power grid into the rectifier module through the AC input interface, and controls the rectifier module to convert the AC power into 24V DC power and then output it through the DC output interface to the auxiliary equipment in the system for power consumption; Or a discharge instruction is sent to the main control board through the communication interface of the main control board, and the main control board controls the first relay to close and the second relay to disconnect, inputs the electric energy stored in the energy storage battery into the DCDC module through the DC input interface, and controls the DCDC module to transform the electric energy stored in the energy storage battery into 24V DC and then output it through the DC output interface to the auxiliary equipment inside the system for power consumption.

2. The high-efficiency discharge method of an energy storage system according to claim 1, characterized in that: The internal auxiliary equipment of the system includes a thermal management system, a lighting system and a fire protection system.

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