A reverse power supply method and system for an energy storage and battery swapping cabinet

Abstract

The present invention relates to a reverse power supply method for an energy storage and battery swapping cabinet, which includes the following steps: Step 1, set an inverter, a plurality of energy storage units, and a plurality of boost-type DC / DC converters; Step 2, after boosting the output voltages of the plurality of energy storage units respectively through the corresponding plurality of boost-type DC / DC converters, obtain a plurality of boosted voltages; Step 3, connect the plurality of boosted voltages to the inverter at the same time, and perform voltage inversion conversion through the inverter to obtain an inverted voltage; Step 4, connect the inverted voltage to the power grid; The present invention solves the technical problem that in the existing reverse power supply technology of energy storage and battery swapping cabinets, when multiple batteries are connected in series to supply power to the power grid, reverse power supply cannot be performed when one battery is taken out, or the battery models and characteristics are inconsistent with other batteries, or the battery is damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly relates to a reverse power supply method and system for an energy storage and battery swapping cabinet. Background Art

[0002] In the reverse power supply mode of the energy storage and battery swapping cabinet, when the power grid is powered off or the power supply mode is switched independently, the battery in the cabinet will output electric energy in reverse to supply power to the power grid.

[0003] In the prior art, multiple batteries are usually connected in series or in parallel to supply power to the power grid. When using the method of connecting multiple batteries in series, once one of the batteries is taken out, or the battery has a different model or characteristic from other batteries, or the battery is damaged, the reverse power supply operation cannot be performed; when using the method of connecting multiple batteries in parallel, a high battery power is required. If one of the batteries has insufficient power, the power grid will supply power to the battery instead. Summary of the Invention

[0004] In order to solve the technical problems in the prior art of reverse power supply for energy storage and battery swapping cabinets, that is, when multiple batteries are connected in series to supply power to the power grid, the reverse power supply cannot be performed when one of the batteries is taken out, or the battery has a different model or characteristic from other batteries, or the battery is damaged, and when using the method of connecting multiple batteries in parallel, if one of the batteries has insufficient power, the power grid will supply power to the battery instead, the present invention provides a reverse power supply method and system for an energy storage and battery swapping cabinet.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A reverse power supply method for an energy storage and battery swapping cabinet includes the following steps:

[0007] Step 1: Set an inverter, multiple energy storage units, and multiple boost-type DC / DC converters;

[0008] Step 2: After boosting the output voltages of the multiple energy storage units respectively through the multiple corresponding boost-type DC / DC converters, obtain multiple boosted voltages;

[0009] Step 3: Connect the multiple boosted voltages to the inverter at the same time, and perform voltage inversion conversion through the inverter to obtain an inverted voltage;

[0010] Step 4: Connect the inverted voltage to the power supply grid.

[0011] The beneficial effects of the present invention are as follows: The present invention first boosts the output voltage of the energy storage unit and then connects it to the inverter. After voltage inversion by the inverter, it supplies power to the power grid. The power supply mode provided by the present invention is more convenient and practical, and it will not cause the situation that the power grid supplies power to the energy storage unit in reverse due to insufficient electrical energy of a certain energy storage unit.

[0012] Based on the above technical solutions, the present invention can be further improved as follows.

[0013] Further, the specific steps of step one are as follows: Set an inverter, multiple rechargeable batteries, and multiple boost-type DC / DC converters. Divide the multiple rechargeable batteries into multiple groups, with each group being an energy storage unit. The number of the energy storage units is equal to and corresponds one by one to the number of the boost-type DC / DC converters; each energy storage unit includes one or more of the batteries, and all the batteries within each energy storage unit are connected in parallel to the corresponding boost-type DC / DC converter.

[0014] The beneficial effect of adopting the above further solution is that by adopting the method of connecting multiple batteries in parallel, if one battery is damaged, the remaining batteries can still supply power normally. Compared with the traditional series power supply method, the parallel power supply technology provided by this invention patent is more reliable.

[0015] Further, the specific method of connecting all the batteries within each energy storage unit in parallel is as follows: Connect diodes in series on the output terminals of all the batteries within each energy storage unit and then connect them in parallel to the corresponding boost-type DC / DC converter.

[0016] The beneficial effect of adopting the above further solution is that by connecting diodes in series, it can prevent the heating current flowing through the internal resistance of a certain battery from causing the battery to overheat and burn out in the case of insufficient voltage of one of the parallel batteries. After connecting diodes in series, no current will be generated on the internal resistance of the battery, preventing the battery from being damaged.

[0017] Based on the above technical solutions, the present invention also provides a reverse power supply system for an energy storage and battery swapping cabinet, and its technical solution is as follows:

[0018] A reverse power supply system for an energy storage and battery swapping cabinet includes an inverter for supplying power to the power grid and multiple energy storage units for storing electrical energy. The output terminal of each energy storage unit is electrically connected to a boost-type DC / DC converter, and the boost-type DC / DC converter is used to boost the output voltage of the energy storage unit and then output a boosted voltage; all the boost-type DC / DC converters are connected in parallel to the input terminal of the inverter, and the inverter inverts all the boosted voltages to obtain an inverted voltage for supplying power to the power grid.

[0019] Further, each of the electricity storage units includes one or more rechargeable batteries, and the power output terminals of all the batteries within each electricity storage unit are connected in parallel to the corresponding boost DC / DC converter (7).

[0020] Further, a diode is connected in series between the power output terminal of each battery and the corresponding boost DC / DC converter (7).

[0021] Further, the positive pole of the diode is electrically connected to the positive pole of the battery, the negative pole of the diode is electrically connected to the positive pole of the input end of the corresponding boost DC / DC converter, and the negative pole of the battery is electrically connected to the negative pole of the input end of the corresponding boost DC / DC converter.

[0022] Further, a charger is electrically connected to each battery. The input end of the charger is connected to the power grid. The positive pole of the output end of the charger is electrically connected to the positive pole of the battery, and the negative pole of the output end of the charger is electrically connected to the negative pole of the battery.

[0023] Further, it further includes a watt-hour meter, a relay, a lightning arrester, a manual circuit breaker, and a photovoltaic DC circuit breaker. The input ends of all the chargers are electrically connected to the output end of the watt-hour meter. The output end of the relay is electrically connected to the input end of the watt-hour meter. The input end of the relay is electrically connected to the output end of the lightning arrester. The input end of the lightning arrester is electrically connected to the output end of the manual circuit breaker. The input end of the manual circuit breaker is connected to the power grid. The input end of the photovoltaic DC circuit breaker is electrically connected to the output ends of multiple boost DC / DC converters.

[0024] Further, it further includes an industrial control module, a UPS power supply for supplying power to the industrial control module, a wireless communication module for two-way communication with the industrial control module, a switch for controlling the start and stop of the boost DC / DC converter, and a mobile terminal for two-way communication with the wireless communication module through the Internet. The input end of the UPS power supply is electrically connected to the output end of the watt-hour meter. The output end of the UPS power supply is electrically connected to the power input end of the industrial control module. The switch includes a program-controlled switch and a multi-stage manual circuit breaker connected in series with the program-controlled switch. The signal output end of the industrial control module is respectively electrically connected to the control input end of the program-controlled switch, the control input end of the photovoltaic DC circuit breaker, and the control input end of the relay.

[0025] The beneficial effect of adopting the above further solution is that by setting the industrial control module and the wireless communication module for two-way communication with the industrial control module, the mobile terminal can send control signals to the industrial control module in reverse through the network, and the program-controlled switch, the photovoltaic DC circuit breaker, and the relay can be remotely controlled through the industrial control module. Description of the Drawings

[0026] Figure 1 is the flowchart of the present invention;

[0027] Figure 2 is the system principle block Figure 1 ;

[0028] Figure 3 is the system principle block Figure 2 ;

[0029] Figure 4 is Figure 2 and Figure 3 the structural schematic diagram of the switch in

[0030] Figure 5 is the circuit schematic diagram of the power storage unit.

[0031] In the attached drawings, the list of components represented by each label is as follows:

[0032] 1. Manual circuit breaker; 2. Lightning arrester; 3. Relay; 4. Electric energy meter; 5. Charger; 6. Battery; 7. Boost type DC / DC converter; 8. Switch; 9. Photovoltaic DC circuit breaker; 10. Inverter; 11. Switching power supply; 12. UPS power supply; 13. Mobile terminal; 14. Wireless communication module; 15. Industrial control module; 16. Warehouse control module; 17. Detection module; 18. Program-controlled switch; 19. Multi-stage manual circuit breaker; 20. Temperature and humidity sensor inside the warehouse; 21. Cooling fan inside the warehouse; 22. Temperature and humidity sensor of the cabinet body; 23. Cooling fan of the cabinet body; 24. Diode. Specific embodiments

[0033] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0034] Embodiment 1

[0035] As Figure 1 shown, this embodiment provides a reverse power supply method for an energy storage and power exchange cabinet, including the following steps

[0036] Step 1: Set an inverter 10, 5 power storage units, and 5 boost type DC / DC converters 7;

[0037] Step 2: After boosting the output voltages of the 5 power storage units respectively through the corresponding 5 boost type DC / DC converters 7, 5 boosted voltages are obtained;

[0038] Step 3: Connect the 5 boosted voltages to the inverter 10 at the same time, and perform voltage inversion conversion through the inverter 10 to obtain an inverted voltage;

[0039] Step 4: Connect the inverted voltage to the power grid.

[0040] First, boost the output voltage of the energy storage unit and then connect it in parallel to the inverter 10. After voltage inversion by the inverter 10, it supplies power to the power grid. The power supply mode provided by the present invention is more convenient and practical, and it will not cause the situation that the power grid supplies power to the energy storage unit in reverse due to insufficient electric energy of a certain energy storage unit.

[0041] Specifically, Step 1 is specifically as follows: Set up an inverter 10, 15 rechargeable batteries 6, and 5 boost-type DC / DC converters 7. Divide the 15 rechargeable batteries 6 into 5 groups, with each group being an energy storage unit. Each energy storage unit includes 3 batteries 6, and all the batteries 6 within each energy storage unit are connected in parallel. The specific parallel connection method is: Connect diodes 24 in series on the output terminals of all the batteries 6 within each energy storage unit and then connect them in parallel, and connect to the input terminal of the boost-type DC / DC converter 7.

[0042] By using the method of connecting multiple batteries 6 in parallel, if one battery 6 is damaged, the remaining batteries 6 can still supply power normally. Compared with the traditional series power supply method, the parallel power supply technology provided by this invention patent is more reliable; at the same time, by connecting the diode 24 in series, it can prevent in the case where the voltage of a certain battery 6 among the multiple parallel-connected batteries 6 is insufficient, the heating current flowing through the internal resistance of this battery 6 will cause the battery 6 to overheat and burn out. After connecting the diode 24 in series, no current will be generated on the internal resistance of the battery 6, preventing the battery 6 from being damaged.

[0043] Embodiment 2

[0044] As Figure 2 shown, this embodiment provides a reverse power supply system for an energy storage and battery swapping cabinet, including an inverter 10 for supplying power to the power grid and 5 energy storage units for storing electric energy. The output terminal of each energy storage unit is electrically connected to a boost-type DC / DC converter 7, and the boost-type DC / DC converter 7 is used to boost the output voltage of the energy storage unit and then output a boosted voltage; all the boost-type DC / DC converters 7 are connected in parallel to the input terminal of the inverter 10, and the inverter 10 inverts all the boosted voltages to obtain an inverted voltage for supplying power to the power grid; each energy storage unit includes 3 rechargeable batteries 6, and all the batteries 6 within each energy storage unit are connected in parallel.

[0045] Specifically, the boost DC / DC converter 7 is a boost DC / DC converter. The output voltage of the boost DC / DC converter 7 is a DC voltage of 450V. The positive electrode of the energy storage unit is electrically connected to the positive electrode of the power input terminal of the boost DC / DC converter 7, and the negative electrode of the energy storage unit is electrically connected to the negative electrode of the power input terminal of the boost DC / DC converter 7. The positive electrode of the power output terminal of the boost DC / DC converter 7 is electrically connected to the positive electrode of the power input terminal of the inverter 10, and the negative electrode of the power output terminal of the boost DC / DC converter 7 is electrically connected to the negative electrode of the power input terminal of the inverter 10. The AC voltage output by the inverter 10 directly provides 380V AC power for the power grid.

[0046] A charger 5 is electrically connected to each of the batteries 6. The positive electrode of the output terminal of the charger 5 is electrically connected to the positive electrode of the battery 6, and the negative electrode of the output terminal of the charger 5 is electrically connected to the negative electrode of the battery 6.

[0047] A switch 8 is provided on each boost DC / DC converter, and the switch 8 controls the start and stop of the boost DC / DC converter.

[0048] On the basis of the above solution, further optimization is made by adding an electricity meter 4, a relay 3, a lightning arrester 2, a manual circuit breaker 1, and a photovoltaic DC circuit breaker 9. The input terminals of the charger 5 are electrically connected to the output terminal of the electricity meter 4. The output terminal of the relay 3 is electrically connected to the input terminal of the electricity meter 4. The input terminal of the relay 3 is electrically connected to the output terminal of the lightning arrester 2. The input terminal of the lightning arrester 2 is electrically connected to the output terminal of the manual circuit breaker 1, and the input terminal of the manual circuit breaker 1 is connected to the power grid. The input terminals of the photovoltaic DC circuit breaker 9 are electrically connected to the output terminals of the 5 boost DC / DC converters 7.

[0049] According to Figures 3 to 4 As shown, it further includes an industrial control module 15, a wireless communication module 14 that communicates bidirectionally with the industrial control module 15, a switch 8 for controlling the start and stop of the boost DC / DC converter 7, a mobile terminal 13 for communicating bidirectionally with the wireless communication module 14 via the Internet, a warehouse control module 16, a detection module 17, a switching power supply 11, and a UPS power supply 12. The switch 8 includes a program-controlled switch 18 and a multi-stage manual circuit breaker 19 connected in series with the program-controlled switch 18. The signal output terminal of the industrial control module 15 is electrically connected to the control input terminal of the program-controlled switch 18, the control input terminal of the photovoltaic DC circuit breaker 9, and the control input terminal of the relay 3 respectively.

[0050] Specifically, the switching power supply 11 is an AD-DC switching power supply. The input end of the switching power supply 11 is electrically connected to the output end of the electric energy meter 4. The output end of the switching power supply 11 is respectively electrically connected to the power input end of the bin control module 16, the power input end of the detection module 17, and the power input end of the industrial control module 15. The bin control module 16, the detection module 17, and the industrial control module 15 are all single-chip integrated modules. The input end of the UPS power supply 12 is electrically connected to the output end of the electric energy meter 4. The output end of the UPS power supply 12 is respectively electrically connected to the power input end of the bin control module 16, the power input end of the detection module 17, and the power input end of the industrial control module 15.

[0051] By setting the industrial control module 15 and the wireless communication module 14 that communicates bidirectionally with the industrial control module 15, the mobile terminal 13 can send control signals to the industrial control module 15 in reverse through the network, and realize remote control of the program-controlled switch 18, the photovoltaic DC circuit breaker 9, and the relay 3 through the industrial control module 15.

[0052] Specifically, 15 accommodation bins with a cavity structure are arranged in the whole cabinet. A battery 6, a charger 5 corresponding to the battery 6, a temperature and humidity sensor 20 inside the bin, and a cooling fan 21 inside the bin are fixedly arranged in each bin. A cabinet temperature and humidity sensor 22 and a cabinet cooling fan 23 are arranged in the cabinet. The bin control module 16 is used to collect the data of the temperature and humidity sensor 20 inside each accommodation bin, and control the start-stop and rotation speed of the cooling fan 21 inside the bin according to the data fed back by the temperature and humidity sensor 20 inside the bin. The detection module 17 is used to receive the data of the cabinet temperature and humidity sensor 22, and control the start-stop and rotation speed of the cabinet cooling fan 23 according to the data fed back by the cabinet temperature and humidity sensor 22.

[0053] According to Figure 5 As shown, a diode 24 is connected in series to the power output end of each battery 6. The positive pole of the diode 24 is electrically connected to the positive pole of the battery 6. The negative pole of the diode 24 is electrically connected to the positive pole of the input end of the boost-type DC / DC converter 7. The negative pole of the battery 6 is electrically connected to the negative pole of the input end of the boost-type DC / DC converter 7.

[0054] In the present invention, components such as a charger 5, a boost DC / DC converter 7, an inverter 10, a battery 6, an industrial control module 15, and a UPS power supply 12 are used in cooperation. Under normal circumstances, the energy storage and battery swapping cabinet charges the battery 6 inside the cabinet through grid power. The user sends a signal to the industrial control module 15 by means of a program software on a mobile terminal 13 or by scanning a QR code on-site, and the industrial control module 15 controls a program-controlled switch 18, a photovoltaic DC circuit breaker 9, and a relay 3 to implement the battery swapping process; when the power grid is powered off, the UPS power supply 12 inside the cabinet supplies power to the industrial control module 15 of the cabinet, and the cabinet automatically switches to a reverse power supply mode. All the batteries 6 inside the cabinet will be boosted first and then connected in parallel. The parallel voltage of every three batteries 6 is boosted to 450V through a boost DC / DC converter 7. The output ends of the boost DC / DC converters 7 are connected in parallel to the voltage input end of the inverter 10 through an equalization technique, and the output end of the inverter 10 is connected to the power grid to supply power to the power grid. The present invention solves the technical problem that in the existing reverse power supply technology of energy storage and battery swapping cabinets, when multiple batteries are connected in series to supply power to the power grid, reverse power supply cannot be performed when one battery is taken out, or the battery models and characteristics are inconsistent with other batteries, or the battery is damaged.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the concept and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reverse power supply system for an energy storage and battery swapping cabinet, characterized in that: It includes an inverter (10) for powering the power grid and a plurality of energy storage units for storing electric energy. The output terminal of each energy storage unit is electrically connected to a boost-type DC / DC converter (7), and the boost-type DC / DC converter (7) is used to boost the output voltage of the energy storage unit and then output a boosted voltage; all the boost-type DC / DC converters (7) are connected in parallel to the input terminal of the inverter (10), and the inverter (10) converts all the boosted voltages and then obtains an inverted voltage for powering the power grid; Each energy storage unit includes one or more rechargeable batteries (6), and the power output terminals of all the batteries (6) in each energy storage unit are connected in parallel to the corresponding boost-type DC / DC converter (7); A charger (5) is electrically connected to each battery (6). The input terminal of the charger (5) is connected to the power grid. The positive pole of the output terminal of the charger (5) is electrically connected to the positive pole of the battery (6), and the negative pole of the output terminal of the charger (5) is electrically connected to the negative pole of the battery (6); It also includes an electricity meter (4), a relay (3), a lightning arrester (2), a manual circuit breaker (1), and a photovoltaic DC circuit breaker (9). The input terminals of all the chargers (5) are electrically connected to the output terminal of the electricity meter (4). The output terminal of the relay (3) is electrically connected to the input terminal of the electricity meter (4). The input terminal of the relay (3) is electrically connected to the output terminal of the lightning arrester (2). The input terminal of the lightning arrester (2) is electrically connected to the output terminal of the manual circuit breaker (1), and the input terminal of the manual circuit breaker (1) is connected to the power grid; the input terminal of the photovoltaic DC circuit breaker (9) is electrically connected to the output terminals of a plurality of boost-type DC / DC converters (7), the output terminal of the photovoltaic DC circuit breaker (9) is electrically connected to the input terminal of the inverter (10), and the output terminal of the inverter (10) is connected to the power grid; It also includes an industrial control module (15), a UPS power supply (12) for supplying power to the industrial control module (15), a wireless communication module (14) in two-way communication with the industrial control module (15), a switch (8) for controlling the start and stop of the boost-type DC / DC converter (7), and a mobile terminal (13) for two-way communication with the wireless communication module (14) via the Internet; the input terminal of the UPS power supply (12) is electrically connected to the output terminal of the electricity meter (4), the output terminal of the UPS power supply (12) is electrically connected to the power input terminal of the industrial control module (15), the switch (8) includes a programmable switch (18) and a multi-stage manual circuit breaker (19) connected in series with the programmable switch (18), and the signal output terminal of the industrial control module (15) is electrically connected to the control input terminal of the programmable switch (18), the control input terminal of the photovoltaic DC circuit breaker (9), and the control input terminal of the relay (3) respectively.

2. The reverse power supply system for an energy storage and battery swapping cabinet according to claim 1, characterized in that: A diode (24) is connected in series between the power output terminal of each battery (6) and the corresponding boost-type DC / DC converter (7).

3. The reverse power supply system for an energy storage and battery swapping cabinet according to claim 2, characterized in that: The positive electrode of the diode (24) is electrically connected to the positive electrode of the battery (6), the negative electrode of the diode (24) is electrically connected to the positive electrode of the input end of the corresponding boost DC / DC converter (7), and the negative electrode of the battery (6) is electrically connected to the negative electrode of the input end of the corresponding boost DC / DC converter (7).

4. A reverse power supply method for an energy storage and battery swapping cabinet, characterized in that: The reverse power supply system applied to the energy storage and battery swapping cabinet according to any one of claims 1 to 3 includes the following steps Step 1: Set an inverter (10), a plurality of energy storage units, and a plurality of boost DC / DC converters (7); Step 2: After boosting the output voltages of the plurality of energy storage units respectively through the corresponding plurality of boost DC / DC converters (7), obtain a plurality of boosted voltages; Step 3: Connect the plurality of boosted voltages to the inverter (10) at the same time, and perform voltage inversion conversion through the inverter (10) to obtain an inverted voltage; Step 4: Connect the inverted voltage to the power grid.

5. The reverse power supply method for an energy storage and battery swapping cabinet according to claim 4, characterized in that: The specific content of Step 1 is to set an inverter (10), a plurality of rechargeable batteries (6), and a plurality of boost DC / DC converters (7); divide the plurality of rechargeable batteries (6) into multiple groups, with each group being an energy storage unit, and the number of energy storage units being equal to and corresponding to the number of boost DC / DC converters (7) one by one; each energy storage unit includes one or more of the batteries (6), and all the batteries (6) within each energy storage unit are connected in parallel to the corresponding boost DC / DC converter (7).

6. The reverse power supply method for an energy storage and battery swapping cabinet according to claim 5, characterized in that: The method of connecting all the batteries (6) within each energy storage unit in parallel to the corresponding boost DC / DC converter (7) is specifically to connect the output terminals of all the batteries (6) within each energy storage unit in series with diodes (24) respectively and then connect them in parallel to the corresponding boost DC / DC converter (7).

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