High-voltage box for energy storage all-in-one machine based on multi-path low-voltage direct-current power supply

Abstract

The utility model belongs to the technical field of energy storage and power supply, and discloses a high-voltage box for an energy storage all-in-one machine based on multi-path low-voltage direct-current power supply. Comprising a first standby power supply, a second standby power supply, an ACDC switching power supply, a DCDC switching power supply and a relay KA, two ends of the relay KA are respectively connected with an L line and an N line of a power grid power supply, and the L line and the N line of the power grid power supply are respectively connected with an input end of the ACDC switching power supply through a normally open contact of the relay KA. Two output ends of the first standby power supply are respectively connected with the input end of the ACDC switching power supply through a normally closed contact of the relay KA; two input ends of the first standby power supply are respectively connected with an L line and an N line of a power grid power supply, and an output end of the second standby power supply is connected with an output end of the ACDC switching power supply through the DCDC switching power supply. According to the utility model, stable power supply of the energy storage all-in-one machine equipment under various working conditions can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the energy storage power supply technical field, concretely relates to a high voltage box for energy storage integrated machine based on multi -way low voltage DC power supply. BACKGROUND

[0002] With the continuous development of industrial society, multi-form energy storage technology has been widely applied, and existing energy storage technology includes mechanical energy storage, chemical energy storage, electrochemical energy storage and electromagnetic energy storage, and each category can be divided into various technologies. Based on the expansion of distributed photovoltaic scale in industrial and commercial parks and the cost reduction of energy storage systems, industrial and commercial energy storage has ushered in a development opportunity.

[0003] The existing high voltage box of the conventional industrial and commercial energy storage integrated machine uses a single power supply for internal device power supply. When the power supply is interrupted due to an emergency, the secondary components in the energy storage integrated machine system cabinet lose power supply, the control system and the communication system are powered off and shut down, and the data exchange with the outside cannot be performed, the system data cannot be read and controlled, the energy storage system is lost, and safety hazards exist. UTILITY MODEL CONTENTS

[0004] The utility model overcomes the deficiencies of the prior art, and solves the technical problems, that is, to provide a high voltage box for an energy storage integrated machine based on multi -way low voltage DC power supply, so as to meet the power supply requirements of the energy storage integrated machine equipment control system in extreme conditions and ensure the safe operation of the energy storage integrated machine equipment.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme of a high voltage box for an energy storage integrated machine based on multi -way low voltage DC power supply, which comprises: a DC circuit breaker ZQF1, a DC contactor KM1, a DC contactor KM2, a DC fuse FU1, a DC fuse FU2, a first backup power supply, a second backup power supply, an ACDC switching power supply, a DCDC switching power supply, one end of a relay KA is connected with a power grid power supply L line, the other end is connected with a power grid power supply N line, the L line and the N line of the power grid power supply are connected with the input end of the ACDC switching power supply through the normally open contact KA1-1 and the normally open contact KA1-2 of the relay KA respectively, the output ends of the first backup power supply are connected with the input end of the ACDC switching power supply through the normally closed contact KA2-1 and the normally closed contact KA2-2 of the relay KA respectively; the output end of the ACDC switching power supply is used for outputting 24V DC power supply for power supply of the load in the box.

[0006] The two input ends of the first backup power supply are connected with the L line and the N of the power grid power supply respectively, the output end of the second backup power supply is connected with the input end of the DCDC switching power supply, and the output end of the DCDC switching power supply is connected with the output end of the ACDC switching power supply.

[0007] One end of the direct current fuse FU1 is connected with the positive pole of the battery in the energy storage integrated machine, the other end is connected with the positive pole of the energy storage converter through the direct current contactor KM1 and the direct current circuit breaker ZQF1 in sequence, one end of the direct current fuse FU2 is connected with the negative pole of the battery in the energy storage integrated machine, the other end is connected with the negative pole of the energy storage converter through the direct current contactor KM2 and the direct current circuit breaker ZQF1 in sequence.

[0008] The high-voltage box for the energy storage integrated machine based on the multi-path low-voltage direct-current power supply further includes an anti-reverse diode D1, the cathode of the anti-reverse diode D1 is connected with the positive pole of the ACDC switching power supply, and the anode is connected with the positive pole of the DCDC switching power supply.

[0009] The high-voltage box for the energy storage integrated machine based on the multi-path low-voltage direct-current power supply further includes a power switch, and the power switch is connected in series with the anti-reverse diode D1.

[0010] The high-voltage box for the energy storage integrated machine based on the multi-path low-voltage direct-current power supply further includes a box body, and the front face of the box body is provided with a positive connector B+ and a negative connector B- for connecting the positive pole and the negative pole of the battery in the energy storage high-voltage box respectively.

[0011] The front face of the box body is further provided with a commercial power indication lamp, an operation indication lamp, a fault indication lamp, a power switch and an external communication interface.

[0012] The external communication interface includes an RS485 interface, a daisy chain interface and a CAN interface, the RS485 interface is used for communication connection with an energy management system, the daisy chain interface is used for communication connection with the energy management systems of the battery units through a daisy chain, and the CAN interface is used for communication connection with an energy storage converter.

[0013] The back face of the box body is provided with a positive connector P+ and a negative connector P- for connecting the positive pole and the negative pole of the energy storage converter, and the direct current circuit breaker ZQF1 is arranged on the back face of the box body.

[0014] The first backup power supply is a lead-acid battery-based uninterruptible power supply (UPS), and the second backup power supply is a lithium ion battery-based battery pack.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a kind of high-voltage box for the energy storage integrated machine based on the multi-path low-voltage direct-current power supply, provides three power supply inputs, respectively grid power supply, lead-acid battery system backup power supply and lithium ion battery system power supply, can satisfy the power supply demand of energy storage integrated machine equipment control system under extreme condition, so that it can normally operate under extreme condition, improve the energy storage integrated machine equipment operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A circuit principle diagram of a high-voltage box for an energy storage all-in-one machine based on multi-path low-voltage direct-current power supply is provided for the embodiments of the present application.

[0017] Figure 2 A main loop circuit principle diagram of the high-voltage box is provided for the embodiments of the present application.

[0018] Figure 3 A front structure schematic diagram of the high-voltage box is provided for the embodiments of the present application.

[0019] Figure 4 A back structure schematic diagram of the high-voltage box is provided for the embodiments of the present application.

[0020] Figure 5 A communication connection schematic diagram of the high-voltage box is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] As shown in Figures 1-4 , the embodiments of the present application provide a high-voltage box for an energy storage all-in-one machine based on multi-path low-voltage direct-current power supply, as shown in Figure 1 , the low-voltage power supply module comprises: a first backup power supply, a second backup power supply, an ACDC switching power supply, a DCDC switching power supply, one end of a relay KA is connected with a grid power supply L line, the other end is connected with a grid power supply N line, the L line and the N line of the grid power supply are connected with the input end of the ACDC switching power supply through the normally open contact KA1-1, KA1-2 and the normally open contact KA2-1, KA2-2 of the relay KA respectively, the output ends of the first backup power supply are connected with the input end of the ACDC switching power supply through the normally closed contact KA3-1, KA3-2 and the normally closed contact KA4-1, KA4-2 of the relay KA respectively; the output end of the ACDC switching power supply is used for outputting 24V direct-current power supply to supply power for the load in the box. Two input ends of the first backup power supply are connected with the L line and the N of the grid power supply respectively, the output end of the second backup power supply is connected with the input end of the DCDC switching power supply, and the output end of the DCDC switching power supply is connected with the output end of the ACDC switching power supply.

[0023] Further, in the embodiment, the low-voltage power supply module further comprises an anti-reverse diode D1, a cathode of the anti-reverse diode D1 is connected with a positive electrode of the ACDC switching power supply, and an anode is connected with a positive electrode of the DCDC switching power supply.

[0024] Further, in the embodiment, the low-voltage power supply module further comprises a power switch, which is a boat-shaped switch and is connected in series with the anti-reverse diode D1. The function of the power switch is to ensure that when the power grid exists, the ACDC switching power supply and the DCDC switching power supply compete for power supply. In actual application, the output voltage of the ACDC switching power supply is adjusted to 25V by a potentiometer, so that the ACDC switching power supply is preferentially powered, and the output end of the ACDC switching power supply will not flow to the DCDC output end.

[0025] As shown in Figure 2 , in the embodiment, the main circuit in the high-voltage box comprises a DC circuit breaker ZQF1, a DC contactor KM1, a DC contactor KM2, a DC fuse FU1, and a DC fuse FU2. One end of the DC fuse FU1 is connected with a positive electrode of a battery in the energy storage all-in-one machine, and the other end is connected with a positive electrode of an energy storage converter through the DC contactor KM1 and the DC circuit breaker ZQF1 in sequence. One end of the DC fuse FU2 is connected with a negative electrode of the battery in the energy storage all-in-one machine, and the other end is connected with a negative electrode of the energy storage converter through the DC contactor KM2 and the DC circuit breaker ZQF1 in sequence. The DC circuit breaker ZQF1 functions to cut off and protect the circuit, the DC contactor KM1 and the DC contactor KM2 function to cut off and close the circuit, and the DC fuse FU1 and the DC fuse FU2 provide short-circuit protection for the circuit.

[0026] Further, as shown in Figure 3 , the high-voltage box for the energy storage all-in-one machine based on the multi-path low-voltage DC power supply in the embodiment further comprises a box body, and the box body is provided with a positive connector B+ and a negative connector B- on the front face for connecting the positive electrode and the negative electrode of the battery in the energy storage high-voltage box, respectively. Further, the box body is further provided with a commercial power indicator lamp, an operation indicator lamp, a fault indicator lamp, a power switch, and an external communication interface on the front face.

[0027] Further, in the embodiment, the box body is provided with a positive connector P+ and a negative connector P- on the back face for connecting the positive electrode and the negative electrode of the energy storage converter, and the DC circuit breaker ZQF1 is arranged on the back face of the box body.

[0028] Further, in the embodiment, the first backup power supply is an uninterruptible power supply (UPS) with a lead-acid battery as an energy storage carrier, and the second backup power supply is a battery pack with a lithium ion battery (lithium iron phosphate battery) as an energy storage carrier. The DC voltage at the end of the battery pack is directly connected to the DCDC switching power supply. In addition, as shown in Figure 1As shown, the primary side of the battery pack is connected to the power grid through a high-voltage box and an energy storage converter to realize charging of the battery pack.

[0029] Further, in the embodiment, the external communication interface includes an RS485 interface, a daisy chain interface and a CAN interface, as shown in the figure. Figure 5 As shown, the RS485 interface is used for communication connection with the energy management system, the daisy chain interface is used for communication connection with the energy management system of each battery unit through the daisy chain, and the energy management system can obtain the data of each battery unit through the communication connection between the energy storage high-voltage box and the daisy chain, and the CAN interface is used for communication connection with the energy storage converter. The communication diagram of the high-voltage box and the battery PACK box internal battery management system BMU obtains the voltage and temperature of the battery cell through the daisy chain communication. The energy storage high-voltage box and the energy storage converter PCS interact important information in the charging and discharging process through CAN communication, and ensure fast response in the charging and discharging process. The energy storage high-voltage box and the energy management system EMS transmit the voltage and temperature of the battery cell in all battery clusters collected by the energy storage high-voltage box and the total voltage, current information and related data of the protection inside the high-voltage box to the EMS through 485 communication, and the EMS collects data in real time to ensure the safety of the system.

[0030] The working principle of the utility model is as follows: normal working condition: power grid power as main circuit power (first way), normal power supply, relay KA coil power, normally open contact KA1-1 and normally open contact KA1-2 close, normally closed contact KA2-1 and normally closed contact KA2-2 open, first standby power as second power supply stops output at this time, in the floating charge stage, always maintain the power at high level. At this time, the ACDC switching power supply is powered by the power grid power supply, and the ACDC switching power supply outputs DC24V, and the second standby power supply is used as the third power supply to power the DCDC switching power supply. Under this working condition, the output voltage of the ACDC switching power supply is adjusted to be greater than the output voltage of the DCDC switching power supply (the output voltage of the ACDC switching power supply is adjusted to 25V) to realize the competition of the two, and the normal working condition uses the power grid power supply, and the DCDC switching power supply output positive circuit increases the anti-reverse diode D1 to ensure that the ACDC switching power supply output voltage will not be sent to the output end of the DCDC switching power supply.

[0031] When the first power supply, i.e. the power grid power supply, is powered off, the coil of the relay KA loses power, the normally open contact KA1-1 and the normally open contact KA1-2 are disconnected, the normally closed contact KA2-1 and the normally closed contact KA2-2 are closed, and the second power supply starts to supply power.

[0032] When the first and second power supplies are both not powered, switching is not required, and the third power supply supplies power, at which time the DCDC switching power supply takes power to output, ensuring system load power supply, when the energy storage all-in-one machine battery power drops to a certain value, the main control circuit board controls to stop power supply, to ensure the safety of the battery system.

[0033] In summary, the utility model provides a kind of high voltage box for energy storage all-in-one machine based on multi-path low-voltage DC power supply, in addition to meet the conventional energy storage high voltage box control, protection, communication function, increase 2-way standby power supply on conventional single power supply to realize low-voltage power supply, through the self-designed electric circuit, realize the smooth switching power supply between low-voltage power supply, ensure that energy storage all-in-one machine can be stable power supply under a variety of working conditions, ensure the safe and stable operation of equipment.

[0034] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A high-voltage box for an energy storage all-in-one machine based on multi-path low-voltage direct-current power supply, characterized in that, Comprise: The one end of the DC circuit breaker ZQF1, the DC contactor KM1, the DC contactor KM2, the DC fuse FU1, the DC fuse FU2, the first backup power supply, the second backup power supply, the ACDC switching power supply, the DCDC switching power supply, the relay KA is connected with the grid power supply L line, the other end is connected with the grid power supply N line, the L line and N line of the grid power supply are connected with the input end of the ACDC switching power supply through the normally open contact KA1-1 and the normally open contact KA1-2 of the relay KA respectively, the output ends of the first backup power supply are connected with the input end of the ACDC switching power supply through the normally closed contact KA2-1 and the normally closed contact KA2-2 of the relay KA respectively; the output end of the ACDC switching power supply is used to output 24V DC power supply for the power supply of the load in the box; The two input ends of the first backup power supply are connected with the L line and N of the grid power supply respectively, the output end of the second backup power supply is connected with the input end of the DCDC switching power supply, and the output end of the DCDC switching power supply is connected with the output end of the ACDC switching power supply; The one end of the DC fuse FU1 is connected with the positive electrode of the battery in the energy storage integrated machine, and the other end is connected with the positive electrode of the energy storage converter through the DC contactor KM1 and the DC circuit breaker ZQF1 in sequence, the one end of the DC fuse FU2 is connected with the negative electrode of the battery in the energy storage integrated machine, and the other end is connected with the negative electrode of the energy storage converter through the DC contactor KM2 and the DC circuit breaker ZQF1 in sequence.

2. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 1, characterized in that, It also includes a reverse prevention diode D1, the cathode of the reverse prevention diode D1 is connected with the positive electrode of the ACDC switching power supply, and the anode is connected with the positive electrode of the DCDC switching power supply.

3. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 2, characterized in that, It also includes a power switch, which is connected in series with the reverse prevention diode D1.

4. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 1, characterized in that, It also includes a box, the front of the box is provided with a positive connector B+ and a negative connector B- for connecting the positive and negative electrodes of the battery in the energy storage high-voltage box respectively.

5. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 4, characterized in that, The front of the box is also provided with a mains indicator lamp, an operation indicator lamp, a fault indicator lamp, a power switch and an external communication interface.

6. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 5, characterized in that, The external communication interface includes an RS485 interface, a daisy chain interface and a CAN interface, the RS485 interface is used for communication connection with the energy management system, the daisy chain interface is used for communication connection with the energy management system of each battery unit through the daisy chain, and the CAN interface is used for communication connection with the energy storage converter.

7. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 4, characterized in that, The back of the box is provided with a positive connector P+ and a negative connector P- for connecting the positive and negative electrodes of the energy storage converter, and the DC circuit breaker ZQF1 is arranged on the back of the box.

8. The high-voltage box for an energy storage all-in-one machine based on a multi-path low-voltage direct-current power supply according to claim 4, characterized in that, The first backup power supply is a lead-acid battery as the energy storage carrier of the uninterruptible power supply UPS, and the second backup power supply is a lithium ion battery as the energy storage carrier of the battery pack.

Images