CN222868591U

CN222868591U - Power supply control circuit, energy storage cabinet and energy storage system

Info

Publication number: CN222868591U
Application number: CN202421175150.1U
Authority: CN
Inventors: 袁国清; 孙德亮; 方志钱; 来华星
Original assignee: Sungrow Renewables Development Co Ltd
Current assignee: Sungrow Renewables Development Co Ltd
Priority date: 2024-05-24
Filing date: 2024-05-24
Publication date: 2025-05-13
Anticipated expiration: 2034-05-24

Abstract

The utility model relates to the field of power electronics technology, and discloses a power control circuit, an energy storage cabinet and an energy storage system, which are used to set the battery backup time during the switching process between a DC power supply and an AC power supply to prevent the battery from running out of power. It includes: an AC/DC module, a DC/DC module and at least one relay; the positive output terminal of the DC/DC module is connected to the positive output terminal of the AC/DC module and the positive pole of the load through the contact of at least one relay; the negative output terminal of the DC/DC module is connected to the negative output terminal of the AC/DC module and the negative pole of the load; the DC/DC module has a DC input terminal, which is used to connect to a battery, and the DC/DC module is used to adjust the DC power output by the battery to the DC power of the target working voltage; the AC/DC module has an AC input terminal, which is used to connect to the AC mains, and the AC/DC module is used to convert the AC mains into the DC power of the target working voltage.

Description

Power supply control circuit, energy storage cabinet and energy storage system

Technical Field

The present utility model relates to the field of power electronics, and in particular, to a power control circuit, an energy storage cabinet, and an energy storage system.

Background

With the development of new energy, the energy storage system is widely applied, and has diversified application scenes, including various working modes such as peak valley arbitrage, demand management, transformer capacity expansion and the like. The energy storage cabinet is used as an important component of the energy storage system, and also needs to ensure the power supply of a control system in the energy storage system, and direct current loads in the control system mainly comprise a fire detector, a water immersion sensor, an energy management system (ENERGY MANAGEMENT SYSTEM, EMS), a Battery management system (Battery MANAGEMENT SYSTEM, BMS) and the like, and most of the direct current loads need uninterrupted power supply.

The traditional scheme adopts dual supply switching mode to provide uninterrupted power supply for direct current load, but in dual supply switching mode, because the energy storage cabinet battery depth of discharge (Depth of discharge, DOD) is generally set higher, when alternating current power supply loses electricity for a long time, the energy storage cabinet battery is required to be used as direct current power supply to supply power for direct current load for a long time, and the battery in the energy storage cabinet can be caused to be deficient, so that the service life of the battery is reduced.

Disclosure of utility model

The utility model provides a power supply control circuit, an energy storage cabinet and an energy storage system, which are used for setting the standby time of a battery in the switching process of a direct current power supply and an alternating current power supply and preventing the battery from generating power shortage.

The first aspect of the utility model provides a power supply control circuit which comprises an AC/DC module, a DC/DC module and a control module, wherein the control module comprises at least one relay, the positive electrode output end of the DC/DC module is connected with the positive electrode output end of the AC/DC module and the positive electrode of a load through the contact of the at least one relay, the negative electrode output end of the DC/DC module is connected with the negative electrode output end of the AC/DC module and the negative electrode of the load, the control module is used for controlling the conduction duration between the positive electrode output end of the DC/DC module and the positive electrode of the load through the delayed opening or closing of the corresponding contact of each relay, the DC/DC module is provided with a direct current input end, the direct current input end is used for being connected with a battery, the DC/DC module is used for adjusting the direct current output by the battery to the direct current of the target working voltage, the AC/DC module is provided with an alternating current input end, the alternating current input end is used for being connected with alternating current commercial power, and the AC/DC module is used for converting the alternating current commercial power to the direct current of the target working voltage.

In one possible implementation, the control module further comprises a diode unit, wherein a first input end of the diode unit is connected with an anode output end of the AC/DC module, a second input end of the diode unit is connected with an anode output end of the DC/DC module, an output end of the diode unit is connected with a load anode, and the diode unit is used for outputting the voltage of the first input end or the voltage of the second input end to the load anode.

In a feasible implementation mode, the control module comprises a first power-off delay relay, wherein a contact of the first power-off delay relay is a first delay break-action contact, two endpoints of a coil in the first power-off delay relay are respectively connected with positive and negative output ends of the AC/DC module, a first end of the first delay break-action contact is connected with a positive output end of the DC/DC module, and a second end of the first delay break-action contact is connected with a second input end of the diode unit.

In one possible implementation, the control module comprises a first power-off delay relay and a second power-off delay relay, wherein the contacts of the first power-off delay relay are first delay disconnection moving contact points, the contacts of the second power-off delay relay are second delay disconnection moving contact points, two end points of a coil in the first power-off delay relay are respectively connected with positive and negative output ends of an AC/DC module, a first end of the second delay disconnection moving contact point is connected with a first end of the coil of the second power-off delay relay and a positive output end of the DC/DC module, a second end of the second delay disconnection moving contact point is connected with a second input end of the diode unit, and a first end of the first delay disconnection moving contact point is connected with a second end of the coil of the second power-off delay relay.

In one possible implementation, the control module comprises a first solid-state relay, a second solid-state relay and a first power-on delay relay, wherein the contact of the first solid-state relay is a first normally closed contact, the contact of the second solid-state relay is a first normally open contact, the contact of the first power-on delay relay is a first delay break contact, two endpoints of a coil in the first solid-state relay are respectively connected with an anode output end and a cathode output end of the AC/DC module, a first end of the first normally closed contact is connected with a positive electrode output end of the DC/DC module, a second end of the first normally closed contact is connected with a first end of a coil of the first power-on delay relay, a first end of the first delay break contact and a first end of the first normally open contact, a second end of the first normally open contact is connected with a second input end of the diode unit, a second end of the first delay break contact is connected with a first end of a coil of the second solid-state relay, and a second end of the coil of the second solid-state relay is connected with a second end of the coil of the first power-on delay relay, and the DC/DC output end of the second solid-state relay.

In one possible implementation, the control module comprises a first intermediate relay and a first time relay, wherein a contact of the first intermediate relay is a first normally open contact, two end points of a coil in the first intermediate relay are respectively connected with positive and negative output ends of the AC/DC module, the first time relay comprises a first loop input end, a second loop input end, a third loop input end and a first loop output end, the first end of the first normally open contact is connected with the second loop input end and the positive output end of the DC/DC module, the second end of the first normally open contact is connected with the first loop input end, the third loop input end is connected with the negative output end of the DC/DC module, and the first loop output end is connected with the second input end of the diode unit.

In a feasible implementation mode, the control module comprises a first intermediate relay and a first energizing delay relay, wherein a contact of the first intermediate relay is a first normally closed contact, the contact of the first energizing delay relay is a first delay break-make contact, two end points of a coil in the first intermediate relay are respectively connected with an anode output end and a cathode output end of the AC/DC module, a first end of the first normally closed contact is connected with the anode output end of the DC/DC module, a second end of the first normally closed contact is connected with a first end of the coil of the first energizing delay relay and a first end of the first delay break-make contact, a second end of the first delay break-make contact is connected with a second input end of the diode unit, and a second end of the coil of the first energizing delay relay is connected with a cathode output end of the DC/DC module.

In a possible embodiment, the control module further comprises an energy storage capacitor arranged between the load anode and the load cathode, the energy storage capacitor being used for powering the load during the switching delay of the AC/DC module and the DC/DC module.

In a feasible implementation mode, the control module comprises a battery management system BMS, a first intermediate relay and a second intermediate relay, wherein the contact of the first intermediate relay is a first normally-open contact, the contact of the second intermediate relay is a first normally-closed contact, two end points of a coil of the first intermediate relay are respectively connected with positive and negative output ends of an AC/DC module, two ends of the coil of the first intermediate relay are connected with digital input ends of the BMS, the coil of the second intermediate relay is connected with a high-side digital output end of the BMS, the output voltage of the high-side output end is the power supply voltage of the BMS, the first end of the first normally-closed contact is connected with the positive output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the second input end of the diode unit.

In a possible implementation mode, the control module comprises a battery management system BMS, a direct current breaker and a first intermediate relay, wherein contacts of the first intermediate relay are first normally open contacts, two end points of a coil of the first intermediate relay are respectively connected with positive and negative output ends of an AC/DC module, two ends of the first normally open contacts are connected with digital input ends of the BMS, an anode output end of the DC/DC module is connected with a second input end of a diode unit after passing through the direct current breaker, and a cathode output end of the DC/DC module is connected with a load cathode after passing through the direct current breaker.

In one possible implementation mode, the DC/DC module includes an operating voltage protection unit, where the operating voltage protection unit is configured to stop outputting the direct current when the output voltage of the DC/DC module is less than a voltage threshold, and the voltage threshold is greater than an under-voltage protection value of the battery of the energy storage cabinet.

In one possible implementation, a self-locking button is arranged on the loop where the positive output end of the DC/DC module is located, and the self-locking button is used for providing a black start function and an emergency shutdown function.

A second aspect of the present utility model provides an energy storage cabinet comprising the power control circuit and the battery of any of the embodiments described above in the first aspect.

A third aspect of the present utility model provides an energy storage system including the energy storage cabinets of the second aspect and an energy management system for managing energy of the batteries in each of the energy storage cabinets.

The technical scheme includes that the AC/DC module, the DC/DC module and the control module comprise at least one relay, the positive electrode output end of the DC/DC module is connected with the positive electrode output end of the AC/DC module and the positive electrode of a load through contacts of the at least one relay, the negative electrode output end of the DC/DC module is connected with the negative electrode output end of the AC/DC module and the negative electrode of the load, an electric appliance of the control module is used for controlling the conduction duration between the positive electrode output end of the DC/DC module and the positive electrode of the load through delayed opening or closing of corresponding contacts of each relay, the DC/DC module is provided with a direct current input end, the direct current input end is used for being connected with a battery, the DC/DC module is used for adjusting direct current output by the battery into direct current of target working voltage, the AC/DC module is provided with an alternating current input end, and the AC/DC module is used for converting alternating current commercial power into direct current of the target working voltage. According to the utility model, the standby time of the battery is set by delayed opening or closing of the relay contact in the switching process of the direct current power supply and the alternating current power supply, the time of the battery for supplying power to the load is controlled, and the battery is prevented from generating power shortage.

Drawings

FIG. 1 is a schematic diagram of a power control circuit according to an embodiment of the utility model;

FIG. 2 is a schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a power control circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of another power control circuit according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of another power control circuit according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of another configuration of a power control circuit according to an embodiment of the present utility model;

FIG. 7 is a schematic diagram of another configuration of a power control circuit according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of another configuration of a power control circuit according to an embodiment of the present utility model;

Fig. 9 is a schematic diagram of another structure of a power control circuit according to an embodiment of the utility model.

Detailed Description

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1, an embodiment of the present utility model provides a power control circuit, which specifically includes:

an AC/DC module 110, a DC/DC module 120, and a control module 130, the control module 130 including at least one relay;

The positive output end of the DC/DC module 120 is connected with the positive output end of the AC/DC module 110 and the positive electrode of the load through the contact of at least one relay;

the negative electrode output end of the DC/DC module 120 is connected with the negative electrode output end of the AC/DC module 110 and the negative electrode of the load;

The control module 130 is configured to control a conduction period between the positive output end of the DC/DC module 120 and the positive electrode of the load by time delay opening or closing of the corresponding contacts of each relay;

The DC/DC module 120 has a DC input terminal for connection to a battery, and the DC/DC module 120 is configured to adjust the DC output from the battery to a DC of a target operating voltage;

The AC/DC module 110 has an AC input for connection to an AC mains supply, and the AC/DC module 110 is for converting the AC mains supply into DC power of a target operating voltage.

According to the utility model, the battery connected with the direct current input end and the alternating current commercial power connected with the alternating current input end are opened or closed by the delay of the relay contact in the switching process, so that the standby time of the battery is set, the time of supplying power to a load by the battery is controlled, and the battery is prevented from generating power shortage.

The AC input end of the AC/DC module 110 is connected to AC mains, and the positive and negative electrodes of the DC input end of the DC/DC module 120 are connected to the positive and negative electrodes of the battery, respectively. The battery connected with the direct current input end can be arranged in the energy storage cabinet or outside the energy storage cabinet, and for a plurality of energy storage cabinets, part of the battery can be arranged in the energy storage cabinet at the same time, and part of the battery is arranged outside the energy storage cabinet.

It can be understood that at least one relay can select a relay type number with a delay function or control the signal sending time through a battery management system BMS to realize the delay function, so as to control the power supply time of the DC/DC module to the load, avoid the battery power shortage of the power supply and influence the service life of the battery.

In one possible embodiment, as shown in fig. 2, the control module further comprises a diode unit;

The first input end of the diode unit is connected with the positive electrode output end of the AC/DC module, the second input end of the diode unit is connected with the positive electrode output end of the DC/DC module, and the output end of the diode unit is connected with the positive electrode of the load;

The diode unit is used for outputting the voltage of the first input end or the voltage of the second input end to the positive electrode of the load.

In one possible embodiment, as shown in fig. 3, the control module includes a first power-off delay relay KT1, the contacts of which are first delay-off moving contacts KT1-1;

two endpoints of a coil of the first power-off delay relay KT1 are respectively connected with positive and negative output ends of the AC/DC module;

The first end of the first time delay break moving contact KT1-1 is connected with the positive output terminal of the DC/DC module, and the second end of the first time delay break moving contact KT1-1 is connected with the second input terminal of the diode unit DK.

The positive output ends of the AC/DC module 110 and the DC/DC module 120 are connected to two input ends of the diode unit at the same time, wherein the specific structure of the diode unit is shown in fig. 3, and the diode unit is composed of two diodes, so as to form two power supply loops, one loop is a first input end V1-a first diode VD 1-an output end V0, the other loop is a second input end V2-a second diode VD 2-an output end V0, and the voltage of which input end is larger, and the loop corresponding to which input end is turned on.

For example, as shown in fig. 3, AC mains supply is input as AC power to the AC/DC module SP1, a battery of the energy storage cabinet is input as DC power to the DC/DC module SP2, an input end of the AC/DC module SP1 is powered on, an output end of the AC/DC module SP1 outputs a target operating voltage, a coil of the first power-off delay relay KT1 connected to the output end of the AC/DC module SP1 is powered on under the effect of the target operating voltage, a first delay break moving contact KT1-1 corresponding to the first power-off delay relay KT1 is closed, so that power supplies of the AC/DC module SP1 and the DC/DC module SP2 are simultaneously connected to the diode unit DK, and a loop from the first input end V1 to the output end V0 in the diode unit DK is turned on due to the fact that the output voltage of the AC/DC module SP1 is regulated to be greater than the output voltage of the DC/DC module SP2, and the AC mains supply is supplied to a DC load. When the alternating current mains supply is powered off, the coil of the first power-off delay relay KT1 is powered off, the first delay disconnection moving contact KT1-1 corresponding to the KT1 is disconnected in a delay manner, the delay time corresponding to the contact can be set according to actual requirements, and the contact is automatically disconnected after reaching the preset time duration, so that the control of the battery standby time is realized, and the battery shortage is prevented. If the AC mains supply is recovered in the power supply delay process of the DC/DC module SP2 (i.e., the DC/DC module supplies power and does not reach the preset time duration), after the AC/DC module SP1 supplies voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is powered on, the first delay break-make contact KT1-1 of the KT1 is always closed, and at this time, the voltage output by the AC/DC module SP1 is higher than the voltage output by the DC/DC module SP2, and the load is converted into the AC mains supply. When the alternating current power supply is in power failure next time, the first power-off delay relay KT1 is re-timed and delayed to be disconnected, and the automatic cycle is repeated.

The diode unit DK has the function of isolating the main power supply output of the AC/DC module from the standby power supply output of the DC/DC module, preventing the two power supplies from being connected in parallel and avoiding the repeated action of the first power-off delay relay KT 1. It can be understood that in this embodiment, the coil of the first outage delay relay KT1 may be directly connected to two ends of the LN of the ac mains, and only the coil operating voltage may be modified during the type selection, and the diode unit DK may be eliminated at this time.

Optionally, the DC/DC module may further include a working voltage protection unit, where the working voltage protection unit is configured to stop outputting the direct current when the output voltage of the DC/DC module is less than a voltage threshold, and the voltage threshold is greater than an under-voltage protection value of the battery of the energy storage cabinet.

The working voltage protection unit sets the lower limit value (voltage threshold value) of the power supply working voltage of the DC/DC module according to the capacity configuration of different batteries, and the lower limit value can be slightly larger than the under-voltage protection value of the batteries, namely the DC/DC module stops outputting before the under-voltage protection of the batteries, so that the purpose of preventing the battery from being deficient in power is achieved.

Optionally, a self-locking button is arranged on a loop where the positive electrode output end of the DC/DC module is located, and the self-locking button is used for providing a black start function and an emergency shutdown function.

As shown in fig. 3, the self-locking button SB2 is manually closed, and the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and the connection of the output loop of the DC/DC module, so as to perform emergency control or maintenance, or perform black start of a part of circuits.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 3, the number of first delay opening moving contact KT1-1 of KT1 in the figure can be two, or one or more than two parallel contacts can be drawn, the number of the contacts is not limited, the selection can be performed according to actual needs, and the specific number is not limited.

It will be appreciated that the AC/DC module and the DC/DC module need to be grounded, and as shown in fig. 3, the AC/DC module and the DC/DC module are further connected with a PE line, and in this embodiment and the subsequent embodiments, the AC/DC module and the DC/DC module need to be grounded, which is not described further.

In one possible implementation, as shown in fig. 4, the control module includes a first power-off delay relay KT1 and a second power-off delay relay KT2, where a contact of the first power-off delay relay KT1 is a first delay-off moving contact KT1-1, and a contact of the second power-off delay relay KT2 is a second delay-off moving contact KT2-1;

The first end of the second delay break moving contact KT2-1 is connected with the first end of a coil of the second power-off delay relay KT2 and the positive output end of the DC/DC module, and the second end of the second delay break moving contact KT2-1 is connected with the second input end of the diode unit DK;

The first end of the first delay break moving contact KT1-1 is connected with the second end of the coil of the second power-off delay relay KT2, and the second end of the first delay break moving contact KT1-1 is connected with the negative electrode output end of the DC/DC module.

The positive output ends of the AC/DC module and the DC/DC module are simultaneously connected with two input ends of the diode unit DK, wherein the specific structure of the diode unit is shown in fig. 4, the diode unit is composed of two diodes, two power supply loops are formed, one loop is composed of a first input end V1, a first diode VD1, an output end V0, a second input end V2, a second diode VD2, an output end V0, and a loop corresponding to the input end is conducted.

For example, as shown in fig. 4, AC mains supply is input as AC power to the AC/DC module SP1, a battery of the energy storage cabinet is input as DC power to the DC/DC module SP2, an input end of the AC/DC module SP1 is powered on, an output end of the AC/DC module SP1 outputs a target operating voltage, under the action of the target operating voltage, a coil of the first power-off delay relay KT1 connected to the output end of the AC/DC module SP1 is powered on, a first delay break moving contact KT1-1 corresponding to the first power-off delay relay KT1 is closed, a coil of the second power-off delay relay KT2 is powered on, a second delay break moving contact KT2-1 is closed, power supplies of the AC/DC module SP1 and the DC/DC module SP2 are simultaneously connected to the diode unit DK, and a loop from the first input end V1 to the output end V0 in the diode unit DK is turned on due to the output voltage of the AC/DC module SP1 being adjusted to be greater than the output voltage of the DC/DC module SP 2. When the alternating current mains supply is powered off, the coil of the first power-off delay relay KT1 is powered off, the first delay disconnection moving contact KT1-1 corresponding to the first delay disconnection moving contact KT1-1 is disconnected in a delay manner, the delay time of the first delay disconnection moving contact KT1-1 and the delay time of the second delay disconnection moving contact KT2-1 can be set according to actual requirements, the first delay disconnection moving contact KT1-1 and the second delay disconnection moving contact KT2-1 are automatically disconnected after a preset time duration is reached, control of battery standby time is achieved, and battery power shortage is prevented. If the AC mains supply is recovered in the power supply delay process of the DC/DC module SP2 (i.e., the DC/DC module supplies power and does not reach the preset time duration), after the AC/DC module SP1 supplies voltage to the coil of the first power-off delay relay KT1, the coil of the first power-off delay relay KT1 is powered on, the first delay-off moving contact KT1-1 of the KT1 is kept closed, the coil of the second power-off delay relay KT2 is always powered on, the second delay-off moving contact KT2-1 of the KT2 is always kept closed, and at this time, the voltage output by the AC/DC module SP1 is higher than the voltage output by the DC/DC module SP2, and the load is converted into the AC mains supply. When the alternating current power supply is in power failure next time, the first power-off delay relay KT1 and the second power-off delay relay KT2 are in timing delay disconnection again, and thus automatic cycle reciprocation is achieved.

The diode unit DK has the function of isolating the main power supply output of the AC/DC module from the standby power supply output of the DC/DC module, preventing the two power supplies from being connected in parallel and avoiding the repeated action of the first power-off delay relay KT 1. It can be understood that, in this embodiment, the coil of the first outage delay relay KT1 may be directly connected to two ends of the LN of the AC mains, and only the coil working voltage may be modified during type selection, and because the output end of the AC/DC module has no relay coil, the diode unit DK may be eliminated at this time.

As shown in fig. 4, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 4, the number of first delay-open moving contacts KT1-1 of KT1 in the drawing can be two or more in parallel, the number of second delay-open moving contacts KT2-1 of KT2 can be two or more, and the number of contacts shown in the drawing does not represent the limitation of the number of the contacts, only the position indication of the contacts can be selected according to the actual requirement, and the specific number is not limited.

In one possible implementation, as shown in fig. 5, the control module includes a first solid-state relay KM1, a second solid-state relay KM2, and a first power-on delay relay KT1, where a contact of the first solid-state relay KM1 is a first normally-closed contact, a contact of the second solid-state relay KM2 is a first normally-open contact, and a contact of the first power-on delay relay KT1 is a first delay-off break contact KT1-2;

Two endpoints of a coil in the first solid-state relay are respectively connected with positive and negative output ends of the AC/DC module;

The first end of the first normally-closed contact is connected with the positive output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the first end of the coil of the first energizing delay relay KT1, the first end of the first delay disconnection moving break contact KT1-2 and the first end of the first normally-open contact;

the second end of the first normally open contact is connected with the second input end of the diode unit DK;

The second end of the first delay break-make contact KT1-2 is connected with the first end of the coil of the second solid-state relay KM2, and the second end of the coil of the second solid-state relay KM2 is connected with the second end of the coil of the first electrifying delay relay KT1 and the negative electrode output end of the DC/DC module.

For example, as shown in fig. 5, AC mains supply is input as AC power to the AC/DC module SP1, a battery of the energy storage cabinet is input as DC power to the DC/DC module SP2, an input end of the AC/DC module SP1 is powered on, an output end of the AC/DC module SP1 outputs a target operating voltage, a coil of the first solid-state relay KM1 connected to the output end of the AC/DC module SP1 is powered on under the action of the target operating voltage, a first normally-closed contact corresponding to the first solid-state relay KM1 is opened, the DC/DC module SP2 has no output voltage, and the AC mains supply supplies DC load. When alternating current mains supply loses power, a coil of the KM1 loses power, a first normally-closed contact corresponding to the first solid-state relay KM1 is closed, at the moment, the coil of the first electrified time-delay relay KT1 is electrified, a first time-delay disconnection movable disconnection contact KT1-2 of the KT1 is delayed to be disconnected, the coil of the second solid-state relay KM2 is electrified, a first normally-open contact of the KM2 is closed, a DC/DC module outputs voltage to a positive pole of a load, after the first electrified time-delay relay KT1 reaches a preset time duration, the corresponding first time-delay disconnection movable disconnection contact KT1-2 is automatically disconnected, the coil of the KM2 of the second solid-state relay is powered off, the corresponding first normally-open contact of the second solid-state relay KM2 is disconnected, the standby time of a battery in an energy storage cabinet is controlled, and battery power shortage is prevented. The delay time of the first delay breaking break contact KT1-2 may be set according to requirements, which is not limited herein. If the AC mains supply is recovered in the power supply delay process of the DC/DC module SP2 (i.e., the DC/DC module supplies power and does not reach the preset time duration), after the AC/DC module SP1 supplies voltage to the coil of the first solid state relay KM1, the coil of the first solid state relay KM1 is powered on, the first normally closed contact corresponding to the first solid state relay KM1 is disconnected, the DC/DC module SP2 stops outputting the voltage, the AC mains supply of the AC/DC module SP1 supplies power to the load, and when the AC power supply loses power next time, the first power-on delay relay KT1 is disconnected again in a timing delay, and thus the automatic cycle is repeated.

The diode unit DK is used for isolating the main power output of the AC/DC module SP1 from the standby power output of the DC/DC module SP2, preventing the two power supplies from being connected in parallel, and avoiding the repetitive action of the first solid state relay KM 1.

It can be understood that in this embodiment, the coil of the first solid state relay KM1 may be directly connected to two ends of the LN of the AC mains supply, and only the coil operating voltage may be modified during the selection, and the diode unit DK may be omitted because the output end of the AC/DC module SP1 has no relay coil.

As shown in fig. 5, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 5, the number of the first normally-closed contacts of KM1 in the figure can be one, or can be drawn into two or more than two in parallel, the number of the first normally-open contacts of KM2 can be one, or can be drawn into two or more than two in parallel, the contacts shown in the figure do not represent limitation on the number of the contacts, only the position indication of the contacts can be selected according to actual requirements, and the specific number is not limited.

In a possible embodiment, as shown in fig. 6, the control module includes a first intermediate relay KM1 and a first time relay KT1, where the contact of the first intermediate relay is a first normally open contact;

Two endpoints of a coil in the first intermediate relay KM1 are respectively connected with positive and negative output ends of the AC/DC module SP 1;

the first time relay KT1 comprises a first loop input end, a second loop input end, a third loop input end and a first loop output end;

The first end of the first normally open contact is connected with the second loop input end and the positive electrode output end of the DC/DC module;

the second end of the first normally open contact is connected with the input end of the first loop;

the third loop input end is connected with the negative electrode output end of the DC/DC module, and the first loop output end is connected with the second input end of the diode unit.

For example, as shown in fig. 6, AC mains supply is input as AC power source to the AC/DC module SP1, a battery of the energy storage cabinet is input as DC power source to the DC/DC module SP2, an input end of the AC/DC module SP1 is powered on, an output end of the AC/DC module SP1 outputs a target operating voltage, a coil of the first intermediate relay KM1 connected to the output end of the AC/DC module SP1 is powered on under the action of the target operating voltage, a first normally open contact corresponding to the first intermediate relay KM1 is closed, the first time relay KT1 controls loop conduction from the first loop input end a to the first loop output end B, and a DC load is supplied by the AC mains supply. When alternating current mains supply loses power, the first intermediate relay KM1 loses power, a first normally open contact corresponding to the KM1 is disconnected, the first time relay KT1 detects a disconnection signal of the first loop input end A, the first time relay KT1 controls the loop from the first loop input end A to the first loop output end B to be disconnected, and controls the loop from the second loop input end A1 to the first loop output end B to be conducted, and after a preset time duration is reached, the loop from the second loop input end A1 to the first loop output end B is automatically disconnected, so that the battery standby time in the DC/DC module is controlled, and battery power shortage is prevented. If the alternating current mains supply is recovered in the process of DC/DC power supply delay, the first intermediate relay KM1 is powered on, the first normally open contact is closed, the loops A and B of the first time relay KT1 are conducted, the loops A1 and B are disconnected, and the load is converted into the alternating current mains supply because the output voltage of the DC/DC module SP2 is smaller than that of the AC/DC module SP 1. And repeating the process when the alternating current power supply is powered off next time, and automatically and circularly reciprocating.

The diode unit DK is used for isolating the main power supply output of the AC/DC module SP1 from the standby power supply output of the DC/DC module, preventing the two power supplies from being connected in parallel, and avoiding the repetitive action of the first intermediate relay KM 1.

It can be understood that in this embodiment, the coil of the first intermediate relay KM1 may be directly connected to two ends of the LN of the AC mains, and the coil operating voltage may be modified only when the AC/DC module SP1 is selected, and the diode unit DK may be omitted because the output end of the AC/DC module SP1 has no relay coil. The first intermediate relay may be replaced by a solid-state relay, so as to achieve the same function, and detailed description thereof is omitted.

As shown in fig. 6, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 6, the number of the first normally open contacts of KM1 in the drawing can be two, or the number of the contacts can be one or more than two in parallel, the contacts shown in the drawing do not represent the limitation on the number of the contacts, only the position indication of the contacts is provided, the selection can be performed according to the actual requirement, and the specific number is not limited.

In one possible implementation, as shown in fig. 7, the control module includes a first intermediate relay KM1 and a first energizing delay relay KT1, where a contact of the first intermediate relay KM1 is a first normally closed contact, and a contact of the first energizing delay relay KT1 is a first delay break contact KT1-2;

The first end of the first normally-closed contact is connected with the positive output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the first end of the coil of the first energizing delay relay KT1 and the first end of the first delay disconnection movable break contact KT 1-2;

The second end of the first delay breaking contact KT1-2 is connected with the second input end of the diode unit DK;

the second end of the coil of the first electrifying delay relay KT1 is connected with the negative electrode output end of the DC/DC module.

For example, as shown in fig. 7, AC mains supply is input as AC power to the AC/DC module SP1, a battery of the energy storage cabinet is input as DC power to the DC/DC module SP2, an input end of the AC/DC module SP1 is powered on, an output end of the AC/DC module SP1 outputs a target operating voltage, a coil of the first intermediate relay KM1 connected to the output end of the AC/DC module SP1 is powered on under the action of the target operating voltage, a first normally closed contact corresponding to the first intermediate relay KM1 is opened, output of the DC/DC module SP2 is interrupted, the first on-time delay relay KT1 is powered off, and the first on-time delay off-time contact KT1-2 is normally closed. When alternating current mains supply loses power, the first intermediate relay KM1 is also powered off, the first normally closed contact is closed, the first power-on delay relay KT1 is powered on, timing is started, after the timing reaches the preset time length, the first delay-off movable breaking contact KT1-2 is disconnected, the DC/DC module SP2 stops supplying power to a direct current load, the standby time of a battery is limited, and battery power shortage is prevented. If alternating current commercial power is recovered during timing of the first power-on delay relay KT1, the coil of the first intermediate relay KM1 is powered on, the first normally closed contact is disconnected, the first power-on delay relay KT1 is powered off, timing is stopped, at the moment, the AC/DC module SP1 is used for supplying power to a load, and after the first power-on delay relay KT1 is powered off, the first time-off movable contact KT1-2 is normally closed. And repeating the process when the alternating current power supply is powered off next time, and automatically and circularly reciprocating.

In a possible embodiment, the control module further comprises an energy storage capacitor arranged between the load anode and the load cathode, the energy storage capacitor being used for powering the load during the switching delay of the AC/DC module SP1 and the DC/DC module SP 2.

As shown in fig. 7, the energy storage capacitor C is connected between the load anode and the load cathode, and supports the direct current load to supply power during the time delay of the power switching of the AC/DC module SP1 and the DC/DC module SP2, so as to avoid the load from being restarted when power failure occurs. It should be noted that, because the intermediate relay is a mechanical structure, the relay operation time needs several tens of milliseconds, when the outage delay output time is smaller than the relay operation time, the load is restarted in a short time, so as to avoid the outage restart, an energy storage capacitor can be provided, and the minimum capacity of the energy storage capacitor meets the requirement that c=2×p×t/(U ₁ ²-U₂ ²), wherein C is the capacity of the energy storage capacitor (in mF), P is the power of the direct current load (in W), t is the time (in ms) required to be supported by the capacitor, U ₁ is the rated voltage (in V) required to be normally operated by the direct current load, and U ₂ is the minimum voltage (in V) required to be normally operated by the direct current load.

The diode unit DK is used for isolating the main power output of the AC/DC module SP1 from the standby power output of the DC/DC module SP2, preventing the two power supplies from being connected in parallel, and avoiding the repetitive operation of the first intermediate relay KM 1.

It can be understood that in this embodiment, the coil of the first intermediate relay KM1 may be directly connected to two ends of the LN of the AC mains, and the coil operating voltage may be modified only when the AC/DC module SP1 is selected, and the diode unit DK may be omitted because the output end of the AC/DC module SP1 has no relay coil. The first intermediate relay can be replaced by a solid-state relay to realize the same function, and when the first intermediate relay is replaced by the solid-state relay, the energy storage capacitor C can be canceled because the action time of the solid-state relay is very short.

As shown in fig. 7, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 7, the number of the first normally-closed contacts KM1 in the drawing can be two, or can be drawn as one or more than two in parallel, the number of the first delay breaking contacts KT1-2 in the drawing can be two, or can be drawn as one or more than two in parallel, the contacts shown in the drawing do not represent the limitation of the number of the contacts, only the position indication of the contacts can be selected according to the actual requirement, and the specific number is not limited.

In a possible implementation manner, as shown in fig. 8, the control module includes a battery management system BMS, a first intermediate relay KM1 and a second intermediate relay KM2, where a contact of the first intermediate relay KM1 is a first normally open contact, and a contact of the second intermediate relay KM2 is a first normally closed contact;

Two endpoints of a coil of the first intermediate relay KM1 are respectively connected with positive and negative output ends of the AC/DC module SP 1;

Two ends of the first normally open contact are connected with the digital input end of the BMS;

The coil of the second intermediate relay KM2 is connected with a high-side digital output end of the BMS, and the output voltage of the high-side digital output end is the power supply voltage of the BMS;

The first end of the first normally-closed contact is connected with the positive electrode output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the second input end of the diode unit.

For example, as shown in fig. 8, the first normally open contact of the first intermediate relay KM1 is connected to the digital input terminal DI of the BMS, the coil of the second intermediate relay KM2 is connected to the high-side digital output terminal DO of the BMS, and the voltage when the DO is output is the power supply voltage of the BMS. After the self-locking button SB2 is closed, the coil of the second intermediate relay KM2 is not powered, the first normally closed contact of KM2 is closed, the AC mains supply and the battery are simultaneously input, the AC mains supply is used as the AC power supply to be input into the AC/DC module SP1, the battery of the energy storage cabinet is used as the DC power supply to be input into the DC/DC module SP2, the input end of the AC/DC module SP1 is powered on, the output end of the AC/DC module SP1 outputs the target working voltage, the coil of the first intermediate relay KM1 is powered on, the first normally open contact corresponding to the first intermediate relay KM1 is closed, the DI of the BMS collects the signal of which the first normally open contact is changed from the split position to the closed position, at the moment, the output end DO of the BMS is not output, the first normally closed contact of KM2 is closed, the AC/DC module SP1 and the DC/DC module SP2 are simultaneously connected to the diode unit DK, and the output voltage of the AC/DC module SP1 is adjusted to be greater than the output voltage of the DC/DC module SP2, and the V1-V0 loop of the diode unit is turned on, and the DC load is powered on by the AC mains supply. When the alternating current commercial power is lost, the alternating current commercial power is converted into a DC/DC module SP2 to supply power for a direct current load, and no delay switching is performed. Meanwhile, the BMS monitors that the contact of the first intermediate relay KM1 is changed into a separated signal from the combined position, timing is started in the BMS, after the preset time is reached, the high-side output end DO of the BMS outputs voltage, the second intermediate relay KM2 is powered on, the first normally-closed contact of the KM2 is disconnected, the DC/DC module SP2 stops supplying power for a direct-current load, control of the battery standby time is achieved, and battery power shortage is prevented. If power is supplied to the DC/DC module SP2, alternating current commercial power is recovered in the timing process of the BMS, the BMS monitors that the contact of the first intermediate relay KM1 is changed from split to combined, the timing is stopped, the current timing is reset, the high-side output end DO of the BMS is not output, the first normally-closed contact of the KM2 is closed, the output voltage of the AC/DC module SP1 is higher than the voltage output by the DC/DC module SP2 at the moment, and the load is automatically converted into commercial power for supplying power. And repeating the process when the alternating current power supply is powered off next time, and automatically and circularly reciprocating. In this embodiment, the BMS is configured to control the high-side digital output terminal DO to stop outputting the voltage when the digital input terminal DI detects that the first normally open contact is from the off position to the on position, and is further configured to start timing when the digital input terminal DI detects that the first normally open contact is from the on position to the off position, and control the high-side digital output terminal DO to output the voltage after a preset period of time.

It can be understood that in this embodiment, the coil of the first intermediate relay KM1 may be directly connected to two ends of the LN of the AC mains, and the coil operating voltage may be modified only when the AC/DC module SP1 is selected, and the diode unit DK may be omitted because the output end of the AC/DC module SP1 has no relay coil. The first intermediate relay and the second intermediate relay may be replaced by a solid-state relay or other relay, so as to realize the same function, and detailed description thereof is omitted herein.

It should be noted that, the contact of the second intermediate relay KM2 may also be a second normally open contact, when the contact of the first intermediate relay KM1 is changed from the split position to the closed position, the input end DI of the BMS obtains a signal, the output end DO of the BMS outputs a DC24V voltage, so that the second normally open contact of the KM2 is closed, and the power supplies of the AC/DC module SP1 and the DC/DC module SP2 are simultaneously connected to the diode unit DK, and since the output voltage of the AC/DC module SP1 is adjusted to be greater than the output voltage of the DC/DC module SP2, the V1-V0 loop in the diode unit DK is turned on, and the AC mains supply supplies power to the DC load. When the alternating current commercial power is lost, the alternating current commercial power is converted into a DC/DC module SP2 to supply power for a direct current load, and no delay switching is performed. Meanwhile, the BMS monitors that the contact signal of the first intermediate relay KM1 is changed from the on position to the off position, the inside of the BMS starts timing, after the time length reaches the preset time length, the high-side output DO of the BMS stops outputting DC24V voltage, the coil of the second intermediate relay KM2 is powered off, the second normally open contact of the KM2 is disconnected, the battery stops supplying power to the direct current load, the battery standby time length is controlled, and the battery is prevented from being deficient.

As shown in fig. 8, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

If the capacity of a single contact of the relay does not meet the load current requirement, the capacity can be expanded by a parallel connection mode of a plurality of contacts so as to meet the requirement, as shown in fig. 8, the number of the first normally-closed contacts of KM2 in the figure can be two, or the number of the first normally-closed contacts can be one or more than two in parallel, the contacts shown in the figure do not represent the limitation on the number of the contacts, only the position indication of the contacts is provided, and the selection can be performed according to the actual requirement, and the specific number is not limited.

In a possible embodiment, as shown in fig. 9, the control module includes a battery management system BMS, a dc breaker QF, and a first intermediate relay KM1, and the contact of the first intermediate relay KM1 is a first normally open contact;

The positive electrode output end of the DC/DC module is connected with the second input end of the diode unit DK after passing through the direct current breaker QF, and the negative electrode output end of the DC/DC module is connected with the negative electrode of the load after passing through the direct current breaker QF;

the electrical operation of the direct current breaker QF is controlled by a closing signal or a opening signal output from the output terminal DO of the BMS.

For example, as shown in fig. 9, the first normally open contact of the first intermediate relay KM1 is connected to the digital input DI of the BMS. The self-locking button SB2 is pressed down, the direct current breaker QF is closed manually, alternating current mains supply and battery input simultaneously, alternating current commercial power is as alternating current power input AC/DC module SP1, the battery of energy storage cabinet is as direct current power input DC/DC module SP2, the output of AC/DC module SP1 exports target operating voltage, the coil of first intermediate relay KM1 gets the electricity, the first normally open contact that first intermediate relay KM1 corresponds is closed, the DI signal of BMS gathers the signal that first normally open contact was turned into the position by the branch position, direct current breaker QF's electric operation is electric this moment, prepare for the circuit breaker action. The AC/DC module SP1 and the DC/DC module SP2 are connected to the diode unit DK at the same time, and the output voltage of the AC/DC module SP1 is regulated to be larger than the output voltage of the DC/DC module SP2, so that the V1-V0 loop of the diode unit DK is conducted, and the AC mains supply supplies power for the DC load. When the alternating current commercial power is lost, the alternating current commercial power is converted into a DC/DC module SP2 to supply power for a direct current load, and no delay switching is performed. Meanwhile, the BMS monitors that the contact of the first intermediate relay KM1 is changed into a separated signal from a closing position, timing is started in the BMS, after a preset time period is reached, the opening control DO output port of the BMS controls the QF electric operation opening, the DC/DC module SP2 stops supplying power to a direct current load, control of battery standby time is achieved, and battery power shortage is prevented. If power is supplied to the DC/DC module SP2, alternating current commercial power is recovered in the timing process of the BMS, the BMS monitors that the contact of the first intermediate relay KM1 is changed from the split position to the closed position, the timing is stopped and the current timing is reset, the closing control DO output port of the BMS controls QF electric operation to be closed, the output voltage of the AC/DC module SP1 is higher than the voltage output by the DC/DC module SP2 at the moment, and the load is automatically converted into commercial power for supplying power. And repeating the process when the alternating current power supply is powered off next time, and automatically and circularly reciprocating. In the embodiment, the BMS is used for stopping timing and returning to zero when the digital input end detects that the first normally open contact is in the switching-on position from the switching-off position, controlling the electric operation switching-on of the direct current breaker, and is also used for starting timing when the digital input end detects that the first normally open contact is in the switching-on position from the switching-on position, and controlling the electric operation switching-off of the direct current breaker after a preset time length.

It can be understood that in this embodiment, the coil of the first intermediate relay KM1 may be directly connected to two ends of the LN of the AC mains, and the coil operating voltage may be modified only when the AC/DC module SP1 is selected, and the diode unit DK may be omitted because the output end of the AC/DC module SP1 has no relay coil. The first intermediate relay may be replaced by a solid-state relay or other relay to achieve the same function, which is not described herein.

As shown in fig. 9, the self-locking button SB2 is always closed under normal working conditions, and is only used for opening or closing the output loop of the DC/DC module, controlling the opening and closing of the output loop of the DC/DC module, and performing emergency control or maintenance, or performing black start of a part of the circuit.

The utility model also provides an energy storage cabinet which comprises the power supply control circuit and the battery in any embodiment.

When the alternating current mains supply is normal, the single local energy storage cabinet preferentially uses the mains supply, does not use the battery power supply of the local energy storage cabinet, and when the alternating current mains supply loses power, the single local energy storage cabinet is switched to the battery power supply of the local energy storage cabinet, so that the uninterrupted operation of the direct current load of the local energy storage cabinet is realized. Meanwhile, the battery standby time of the local energy storage cabinet can be set, and the phenomenon that the service life of the battery is influenced due to the fact that the battery of the local energy storage cabinet is deficient due to long-time standby is avoided.

It should be noted that the utility model solves the problem of battery power shortage possibly caused by using a single energy storage cabinet battery as a standby power supply, can meet the uninterrupted switching of the direct current power supply and the alternating current power supply of the single energy storage cabinet, and simultaneously sets the standby time of the single energy storage cabinet battery to prevent the situation of power shortage of the battery of the energy storage cabinet, thereby improving the service life of the energy storage cabinet battery and the safety and reliability of the system.

The utility model also provides an energy storage system which comprises the energy storage cabinet and an energy management system, wherein the energy management system is used for managing energy of the batteries in each energy storage cabinet.

In the utility model, a delay protection function is provided for the battery in the dual-power switching circuit of the energy storage system, the standby time of the battery is set by delay opening or closing of the relay contact in the switching process of the direct-current power supply and the alternating-current power supply, the time length of the battery for supplying power to the load is controlled, the problem of battery power shortage caused by long-term standby of the battery is avoided, and the service life of the battery is prolonged. Meanwhile, the alternating current power supply and the direct current power supply are switched continuously, so that the reliability of direct current load power supply is ensured.

It should be noted that the foregoing embodiments are merely illustrative embodiments of the present utility model, and not restrictive, and the scope of the utility model is not limited to the foregoing embodiments, but it should be understood by those skilled in the art that any modification, variation or substitution of some technical features described in the foregoing embodiments may be easily made within the scope of the present utility model without departing from the spirit and scope of the technical solutions of the embodiments. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. A power supply control circuit, comprising:

The control system comprises an AC/DC module, a DC/DC module and a control module, wherein the control module comprises at least one relay;

The positive electrode output end of the DC/DC module is connected with the positive electrode output end of the AC/DC module and the load positive electrode through the contact of the at least one relay;

the negative electrode output end of the DC/DC module is connected with the negative electrode output end of the AC/DC module and the load negative electrode;

The control module is used for controlling the conduction time between the positive electrode output end of the DC/DC module and the positive electrode of the load through the delayed opening or closing of the corresponding contacts of each relay;

The DC/DC module is provided with a direct current input end, the direct current input end is used for being connected with a battery, and the DC/DC module is used for adjusting the direct current output by the battery into the direct current of a target working voltage;

The AC/DC module is provided with an alternating current input end, the alternating current input end is used for being connected with alternating current commercial power, and the AC/DC module is used for converting the alternating current commercial power into direct current of target working voltage.

2. The power control circuit of claim 1, wherein the control module further comprises a diode unit;

3. The power control circuit of claim 2, wherein the control module comprises a first power-off delay relay having a first delay break-make contact;

two endpoints of a coil in the first power-off delay relay are respectively connected with positive and negative output ends of the AC/DC module;

The first end of the first delay disconnection moving contact is connected with the positive electrode output end of the DC/DC module, and the second end of the first delay disconnection moving contact is connected with the second input end of the diode unit.

4. The power control circuit of claim 2, wherein the control module comprises a first power-off delay relay and a second power-off delay relay, the contacts of the first power-off delay relay being first delay-off moving contact points, the contacts of the second power-off delay relay being second delay-off moving contact points;

The first end of the second delay break-make contact is connected with the first end of the coil of the second power-off delay relay and the positive output end of the DC/DC module, and the second end of the second delay break-make contact is connected with the second input end of the diode unit;

the first end of the first delay break moving contact is connected with the second end of the coil of the second power-off delay relay, and the second end of the first delay break moving contact is connected with the negative electrode output end of the DC/DC module.

5. The power control circuit of claim 2, wherein the control module comprises a first solid state relay, a second solid state relay, and a first energized delay relay, wherein the contact of the first solid state relay is a first normally closed contact, the contact of the second solid state relay is a first normally open contact, and the contact of the first energized delay relay is a first delayed open break contact;

The first end of the first normally-closed contact is connected with the positive electrode output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the first end of the coil of the first power-on delay relay, the first end of the first delay break-off movable contact and the first end of the first normally-open contact;

The second end of the first normally open contact is connected with the second input end of the diode unit;

the second end of the first delay break-make contact is connected with the first end of the coil of the second solid-state relay, and the second end of the coil of the second solid-state relay is connected with the second end of the coil of the first electrifying delay relay and the negative electrode output end of the DC/DC module.

6. The power control circuit of claim 2, wherein the control module comprises a first intermediate relay and a first time relay, the contact of the first intermediate relay being a first normally open contact;

two endpoints of a coil in the first intermediate relay are respectively connected with positive and negative output ends of the AC/DC module;

The first time relay comprises a first loop input end, a second loop input end, a third loop input end and a first loop output end;

the second end of the first normally open contact is connected with the first loop input end;

7. The power control circuit of claim 2, wherein the control module comprises a first intermediate relay and a first energized delay relay, the contact of the first intermediate relay being a first normally closed contact, the contact of the first energized delay relay being a first delay break contact;

The first end of the first normally-closed contact is connected with the positive electrode output end of the DC/DC module, and the second end of the first normally-closed contact is connected with the first end of the coil of the first power-on delay relay and the first end of the first delay break-off movable contact;

the second end of the first delay break-make contact is connected with the second input end of the diode unit;

and the second end of the coil of the first electrifying delay relay is connected with the negative electrode output end of the DC/DC module.

8. The power control circuit of claim 7 wherein the control module further comprises an energy storage capacitor disposed between the load anode and the load cathode, the energy storage capacitor configured to power the load during a switching delay of the AC/DC module and the DC/DC module.

9. The power control circuit of claim 2, wherein the control module comprises a battery management system BMS, a first intermediate relay, and a second intermediate relay, the contact of the first intermediate relay being a first normally open contact, the contact of the second intermediate relay being a first normally closed contact;

Two endpoints of a coil of the first intermediate relay are respectively connected with positive and negative output ends of the AC/DC module;

Two ends of the first normally open contact are connected to the digital input end of the BMS;

the coil of the second intermediate relay is connected with a high-side digital output end of the BMS, and the output voltage of the high-side digital output end is the power supply voltage of the BMS;

10. The power control circuit of claim 2, wherein the control module comprises a battery management system BMS, a dc breaker, and a first intermediate relay, the contact of the first intermediate relay being a first normally open contact;

the positive pole output end of the DC/DC module is connected with the second input end of the diode unit after passing through the direct current breaker, and the negative pole output end of the DC/DC module is connected with the negative pole of the load after passing through the direct current breaker.

11. The power control circuit according to any one of claims 1 to 10, wherein,

The DC/DC module comprises a working voltage protection unit, wherein the working voltage protection unit is used for stopping outputting direct current when the output voltage of the DC/DC module is smaller than a voltage threshold value, and the voltage threshold value is larger than an under-voltage protection value of the battery of the energy storage cabinet.

12. The power control circuit according to any one of claims 1 to 10, wherein,

The circuit where the positive electrode output end of the DC/DC module is located is provided with a self-locking button, and the self-locking button is used for providing a black start function and an emergency shutdown function.

13. An energy storage cabinet comprising a power control circuit as claimed in any one of claims 1 to 12 and a battery.

14. An energy storage system comprising a plurality of energy storage cabinets according to claim 13 and an energy management system for managing energy from the batteries in each of the energy storage cabinets.