CN220492650U

CN220492650U - Power supply circuit and grid-connected outdoor energy storage system

Info

Publication number: CN220492650U
Application number: CN202322022261.0U
Authority: CN
Inventors: 陈国平
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2023-07-28
Filing date: 2023-07-28
Publication date: 2024-02-13
Anticipated expiration: 2033-07-28

Abstract

The utility model discloses a power supply circuit and a grid-connected outdoor energy storage system, wherein the power supply circuit comprises: an energy storage converter PCS; the first switch is connected in series with the positive electrode of the direct-current side of the PCS; the second switch is connected in series with the direct-current side negative electrode of the PCS; and the first output end of the BMS is connected with the input end of the first switch, and the second output end of the BMS is connected with the input end of the second switch. In the utility model, the on-off instruction sent by the BMS can directly reach the first switch and the second switch without passing through the PCS, so that the action response time of the first switch and the second switch is shorter, the action execution efficiency is higher, and even if the PCS cannot receive the instruction, receives the instruction but does not execute the instruction and the like, the direct-current side loop of the PCS can still be timely turned on or turned off, thereby ensuring the safety of equipment, personnel and the like, and further effectively improving the overall stability and safety.

Description

Power supply circuit and grid-connected outdoor energy storage system

Technical Field

The disclosure relates to the field of energy storage technologies, and in particular relates to a power supply circuit and a grid-connected outdoor energy storage system.

Background

With the rapid development of the energy storage industry, an outdoor energy storage system is generated, so that the outdoor energy storage system not only fills the layout blank of a large-scale commercial energy storage system, but also meets the electricity demand of vast users, and plays roles of grid-connected frequency modulation peak regulation and off-grid load power supply.

However, in the outdoor energy storage system, after the on-off instruction of the main loop is sent out, the on-off instruction can reach the executing element through at least one control device, if the control device in the on-off instruction has a problem, the main loop can not be turned on or off in time, and then accidents such as equipment damage, casualties and the like are caused, so that the stability and the safety are poor.

Disclosure of Invention

The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.

To this end, an object of the present disclosure is to provide a power supply circuit and a grid-connected outdoor energy storage system.

To achieve the above object, a first aspect of the present disclosure provides a power supply circuit, including: an energy storage converter PCS; the first switch is connected in series with the positive electrode of the direct-current side of the PCS; the second switch is connected in series with the direct-current side negative electrode of the PCS; the battery management system BMS, BMS's first output with the input of first switch links to each other, BMS's second output with the input of second switch links to each other.

Optionally, the power supply circuit further includes: the current limiting resistor is connected with the first switch in parallel; and the third switch is connected with the current limiting resistor in series, the third switch is connected with the first switch in parallel, and the input end of the third switch is connected with the third output end of the BMS.

Optionally, the power supply circuit further includes: and the shunt is connected with the second switch in series, and the output end of the shunt is connected with the first input end of the BMS.

Optionally, the first switch includes: the input end of the first coil is connected with the first output end of the BMS, the first normally open contact is connected in series with the positive pole of the direct current side of the PCS, and the current limiting resistor is connected in parallel with the first normally open contact; the second switch includes: the input end of the second coil is connected with the second output end of the BMS, and the second normally open contact is connected in series with the direct-current side negative electrode of the PCS; the third switch includes: the input end of the third coil is connected with the third output end of the BMS, the third normally open contact is connected with the current limiting resistor in series, and the third normally open contact is connected with the first normally open contact in parallel.

Optionally, the power supply circuit further includes: an alternating current power supply; the power supply end of the switching power supply is connected with the power supply end of the alternating current power supply, and the first power supply end of the switching power supply is connected with the first power supply end of the BMS.

Optionally, the power supply circuit further includes: the isolation transformer is connected in series between the power end of the switching power supply and the power supply end of the alternating current power supply, the power end of the isolation transformer is connected with the power supply end of the alternating current power supply, and the first power supply end of the isolation transformer is connected with the power supply end of the switching power supply.

Optionally, the power supply circuit further includes: the wiring terminal is connected in series between the first power supply end of the isolation transformer and the power supply end of the switching power supply, the first end of the wiring terminal is connected with the first power supply end of the isolation transformer, and the second end of the wiring terminal is connected with the power supply end of the switching power supply.

Optionally, the power supply circuit further includes: the power supply end of the UPS is connected with the second power supply end of the isolation transformer, and the power supply end of the UPS is connected with the second power supply end of the BMS; the power supply end of the storage battery is connected with the power supply end of the UPS, and the power supply end of the storage battery is connected with the power supply end of the UPS.

Optionally, the power supply circuit further includes: the energy management system EMS, the power end of the EMS is connected with the second power supply end of the switching power supply, the first output end of the EMS is connected with the second input end of the BMS, the first input end of the EMS is connected with the fourth output end of the BMS, the second output end of the EMS is connected with the first input end of the PCS, and the second input end of the EMS is connected with the first output end of the PCS; the fifth output end of the BMS is connected with the second input end of the PCS, and the third input end of the BMS is connected with the second output end of the PCS.

Optionally, the power supply circuit further includes: the power end of the input display unit is connected with the third power supply end of the switching power supply, the input end of the input display unit is connected with the sixth output end of the BMS, and the output end of the input display unit is connected with the fourth input end of the BMS.

A second aspect of the present disclosure provides a grid-tied outdoor energy storage system, comprising: a battery cluster; according to the power supply circuit provided by the first aspect of the disclosure, the positive electrode of the PCS direct-current side of the power supply circuit is connected with the positive electrode of the battery cluster, the negative electrode of the PCS direct-current side is connected with the negative electrode of the battery cluster, and the alternating-current side of the PCS is connected with a power grid.

Optionally, the battery cluster includes: the power end of the liquid cooling unit is connected with the third power supply end of the isolation transformer of the power supply circuit, the input end of the liquid cooling unit is connected with the seventh output end of the BMS, and the output end of the liquid cooling unit is connected with the fifth input end of the BMS.

Optionally, the battery cluster includes: a fire fighting unit, the fire fighting unit comprising: a gas sensor and a fire extinguishing device; the power end of the gas sensor is connected with the fourth power supply end of the switching power supply of the power supply circuit, and the output end of the gas sensor is connected with the sixth input end of the BMS of the power supply circuit; the power end of the fire extinguishing device is connected with the fifth power supply end of the switching power supply, and the input end of the fire extinguishing device is connected with the eighth output end of the BMS.

The technical scheme provided by the disclosure can comprise the following beneficial effects:

the first switch is connected in series with the positive electrode of the direct current side of the PCS, and the second switch is connected in series with the negative electrode of the direct current side of the PCS, so that the on-off of the first switch and the second switch can control the on-off of a direct current side loop of the PCS, and the first output end of the BMS is connected with the input end of the first switch, and the second output end of the BMS is connected with the input end of the second switch, so that the BMS can control the on-off of the first switch and the second switch, and further realize the on-off control of the direct current side loop of the PCS; wherein, because the on-off instruction that BMS sent need not to pass through PCS and can directly reach first switch and second switch, not only make the action response time of first switch and second switch shorter, action execution efficiency is higher, even when PCS appears unable instruction, receiving instruction but not carry out scheduling problem, PCS's direct current side return circuit still can in time switch on or off, from this guaranteed the safety of equipment, personnel etc., and then effectively promoted holistic stability and security.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic circuit diagram of a power supply circuit according to a related embodiment;

FIG. 2 is a schematic circuit diagram of a power supply circuit according to an embodiment of the disclosure;

FIG. 3 is a schematic circuit diagram of a power supply circuit according to an embodiment of the disclosure;

FIG. 4 is a schematic circuit diagram of a power supply circuit according to an embodiment of the disclosure;

FIG. 5 is a schematic circuit diagram of a power supply circuit according to an embodiment of the disclosure;

FIG. 6 is a schematic circuit diagram of a grid-tied outdoor energy storage system according to one embodiment of the present disclosure;

as shown in the figure: x1, PCS, X2, first switch, X3, second switch, X4, BMS;

1、PCS；

2. a first switch 201, a first coil 202 and a first normally open contact;

3. a second switch 301, a second coil 302, a second normally open contact;

4. BMS,5, current limiting resistor;

6. a third switch 601, a third coil, 602 and a third normally open contact;

7. the power supply comprises a current divider 8, an alternating current power supply 9, a switching power supply 10, an isolation transformer 11, a wiring terminal 12, a UPS 13, a storage battery 14, EMS 15 and an input display unit;

16. battery cluster 161, liquid cooling unit, 162, fire control unit, 1621, gas sensor, 1622, fire extinguishing device.

Detailed Description

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.

As shown in fig. 1, a related embodiment proposes a power supply circuit, including a PCSX1 (Power Conversion System, an energy storage converter), a first switch X2, a second switch X3, and a BMSX4 (Battery Management System, a battery management system), where the first switch X2 is connected in series with a positive pole on a dc side of the PCSX1, the second switch X3 is connected in series with a negative pole on the dc side of the PCSX1, an output terminal of the BMSX4 is connected with an input terminal of the PCSX1, a first output terminal of the PCSX1 is connected with an input terminal of the first switch X2, and a second output terminal of the PCSX1 is connected with an input terminal of the second switch X3.

The first switch X2 is connected in series with the positive electrode of the direct current side of the PCSX1, and the second switch X3 is connected in series with the negative electrode of the direct current side of the PCSX1, so that the on-off of the direct current side loop of the PCSX1 can be controlled by the on-off of the first switch X2 and the second switch X3, and the on-off control of the direct current side loop of the PCSX1 can be realized by the BMSX4 because the output end of the BMSX4 is connected with the input end of the PCSX1, the first output end of the PCSX1 is connected with the input end of the first switch X2, and the second output end of the PCSX1 is connected with the input end of the second switch X3.

However, since the on-off instruction sent by the BMSX4 needs to pass through the PCSX1 to reach the first switch X2 and the second switch X3, if the PCSX1 fails to receive the instruction, receives the instruction but does not execute the instruction, the direct-current side loop of the PCSX1 cannot be turned on or off in time, so that accidents such as equipment damage, casualties and the like are caused, and the stability and the safety are poor.

In order to solve the above technical problems, as shown in fig. 2, the disclosed embodiment provides a power supply circuit, which includes a PCS1, a first switch 2, a second switch 3 and a BMS4, wherein the first switch 2 is connected in series with the positive pole of the dc side of the PCS1, the second switch 3 is connected in series with the negative pole of the dc side of the PCS1, the first output end of the BMS4 is connected with the input end of the first switch 2, and the second output end of the BMS4 is connected with the input end of the second switch 3.

It can be understood that, because the first switch 2 is connected in series with the positive pole of the dc side of the PCS1, and the second switch 3 is connected in series with the negative pole of the dc side of the PCS1, the on-off of the first switch 2 and the second switch 3 can control the on-off of the dc side loop of the PCS1, and because the first output end of the BMS4 is connected with the input end of the first switch 2, the second output end of the BMS4 is connected with the input end of the second switch 3, the BMS4 can control the on-off of the first switch 2 and the second switch 3, so as to realize the on-off control of the dc side loop of the PCS 1.

Wherein, because the on-off instruction that BMS4 sent need not through PCS1 and can reach first switch 2 and second switch 3 directly, not only make the action response time of first switch 2 and second switch 3 shorter, action execution efficiency is higher, even when PCS1 appears unable instruction, receive the instruction but not carry out scheduling problem, PCS 1's direct current side return circuit still can in time switch on or off, from this guaranteed the safety of equipment, personnel etc., and then effectively promoted holistic stability and security.

It should be noted that, the PCS1 is used for ac-dc conversion, the PCS1 may be configured by a dc/ac bidirectional converter, a control unit, etc., and specific types of the PCS1 may be set according to actual needs, which is not limited.

BMS4 is used for intelligent management and maintains each battery unit, prevents that the battery from appearing overcharging and overdischarging, prolongs the life of battery, monitors the state of battery, and BMS4 can include management system, control module, wireless communication module, electrical equipment etc. and BMS 4's concrete type can set up according to actual need, does not do not limit this.

The first switch 2 is configured to respond to an on-off instruction sent by the BMS4 to perform an on-off operation on the positive electrode path of the dc side of the PCS1, and the specific type of the first switch 2 may be set according to actual needs, which is not limited.

The second switch 3 is configured to respond to an on-off instruction sent by the BMS4 to perform an on-off operation on the negative electrode path of the dc side of the PCS1, and the specific type of the second switch 3 may be set according to actual needs, which is not limited.

As shown in fig. 3, 4 and 5, in some embodiments, the power supply circuit further includes a current limiting resistor 5 and a third switch 6, the current limiting resistor 5 is connected in parallel with the first switch 2, the third switch 6 is connected in series with the current limiting resistor 5, and the third switch 6 is connected in parallel with the first switch 2, and an input terminal of the third switch 6 is connected with a third output terminal of the BMS4.

It can be understood that, because the third switch 6 and the current limiting resistor 5 are connected in series, and the current limiting resistor 5 and the third switch 6 are connected in parallel with the first switch 2, when the third switch 6 is turned on, the third switch 6 and the current limiting resistor 5 can conduct the positive electrode path of the direct current side of the PCS1, and simultaneously, the conduction of the direct current side loop of the PCS1 is realized by matching with the conduction of the second switch 3, at this time, the current of the direct current side loop of the PCS1 is smaller due to the current limiting effect of the current limiting resistor 5, so that the damage to the PCS1 caused by excessive current is avoided, and the precharge of the PCS1 is realized.

The input end of the third switch 6 is connected with the third output end of the BMS4, so that the BMS4 can control the on-off of the third switch 6, further, the on-off control of the PCS1 direct current side loop precharge is realized, and the on-off instruction sent by the BMS4 can directly reach the third switch 6 without passing through the PCS1, so that the action response time of the third switch 6 is shorter, the action execution efficiency is higher, and even when the PCS1 cannot receive the instruction, receives the instruction and does not execute the instruction and the like, the precharge of the PCS1 direct current side loop can still be timely switched, thereby ensuring the safety of equipment, personnel and the like, and further effectively improving the overall stability and safety.

When the power supply circuit is operated, under the control of the BMS4, the second switch 3 and the third switch 6 are turned on simultaneously to precharge the dc side loop of the PCS1, and then the first switch 2 is turned on and the third switch 6 is turned off to allow the dc side loop of the PCS1 to enter a stable operation state.

Since devices such as a capacitor are arranged in the PCS1, the devices are easily damaged by excessive current, and the PCS1 can be prevented from being damaged and the stable operation of the PCS1 direct-current side loop can be ensured by precharging the PCS1 direct-current side loop.

The third switch 6 is configured to respond to the on-off instruction sent by the BMS4 to perform an on-off operation on the positive electrode path of the dc side of the PCS1, and the specific type of the third switch 6 may be set according to actual needs, which is not limited.

The current limiting resistor 5 is used for limiting the current in the direct current side loop of the PCS1, and the specific resistance value of the current limiting resistor 5 can be set according to actual needs, which is not limited.

As shown in fig. 3, 4 and 5, in some embodiments, the power supply circuit further includes a shunt 7, the shunt 7 and the second switch 3 are connected in series, and an output terminal of the shunt 7 is connected to a first input terminal of the BMS4.

It can be understood that by the arrangement of the shunt 7, the BMS4 can obtain the current of the negative electrode path of the PCS1 dc side, and further obtain the current of the PCS1 dc side loop, so that the BMS4 can control the on-off of the first switch 2, the second switch 3 and the third switch 6 according to the current of the PCS1 dc side loop, and ensure the stable operation of the PCS1 dc side loop.

Wherein, because shunt 7 and second switch 3 establish ties for shunt 7 has set up on PCS1 direct current side's negative pole passageway, therefore, no matter when first switch 2 switched on or third switch 6 switched on, BMS4 can both obtain PCS1 direct current side return circuit's current size through shunt 7, thereby effectively improved shunt 7's utilization efficiency, reduced the cost of current detection.

The shunt 7 is an instrument for measuring a direct current, and is made according to the principle that a voltage is generated between two ends of a resistor when the direct current passes through the resistor, and the specific type of the shunt 7 can be set according to actual needs, which is not limited.

As shown in fig. 3, in some embodiments, the first switch 2 includes a first coil 201 and a first normally open contact 202, an input terminal of the first coil 201 is connected to a first output terminal of the BMS4, the first normally open contact 202 is connected in series to a dc side positive electrode of the PCS1, and the current limiting resistor 5 is connected in parallel with the first normally open contact 202; the second switch 3 comprises a second coil 301 and a second normally open contact 302, the input end of the second coil 301 is connected with the second output end of the BMS4, and the second normally open contact 302 is connected in series with the direct current side negative electrode of the PCS 1; the third switch 6 includes a third coil 601 and a third normally open contact 602, an input end of the third coil 601 is connected with a third output end of the BMS4, the third normally open contact 602 is connected in series with the current limiting resistor 5, and the third normally open contact 602 is connected in parallel with the first normally open contact 202.

It can be understood that, because the input end of the first coil 201 is connected with the first output end of the BMS4, the BMS4 can utilize the first output end thereof to control the power on and power off of the first coil 201, and further control the on and off of the first normally open contact 202, and because the first normally open contact 202 is serially connected with the positive pole of the direct current side of the PCS1, the BMS4 can utilize the first output end thereof to control the positive pole path of the direct current side of the PCS1, and further realize the on-off control of the direct current side loop of the PCS 1.

Because the input end of the second coil 301 is connected with the second output end of the BMS4, the BMS4 can utilize the second output end to control the power supply and the power failure of the second coil 301, and then control the on and off of the second normally open contact 302, and because the second normally open contact 302 is connected in series with the negative pole of the direct current side of the PCS1, the BMS4 can utilize the second output end to control the negative pole passage of the direct current side of the PCS1, and then realize the on-off control of the direct current side loop of the PCS 1.

Because the input of third coil 601 links to each other with the third output of BMS4 for BMS4 can utilize its third output control third coil 601 get electric and lose electric, and then control the switching on and off of third normally open contact 602, and because third normally open contact 602 establishes ties at PCS 1's direct current side positive pole, and third normally open contact 602 and limiting resistor establish ties, third normally open contact 602 and first normally open contact 202 are parallelly connected, make BMS4 can utilize its third output control PCS1 direct current side positive pole passageway when precharging, and then realize the precharge switch control to PCS1 direct current side return circuit.

Wherein, through the cooperation of first coil 201 and first normally open contact 202, the cooperation of second coil 301 and second normally open contact 302 and the cooperation of third coil 601 and third normally open contact 602 for BMS4 can utilize the heavy current of little electric current control PCS1 direct current side return circuit, and not only control is more stable, convenient, has effectively improved holistic security moreover.

The first switch 2 may be used as a first relay, the first coil 201 of the first switch 2 and the first normally open contact 202 are linked, when the first coil 201 is powered on, the first normally open contact 202 is turned on, and when the first coil 201 is powered off, the first normally open contact 202 is turned off.

The second switch 3 may be used as a second relay, where the second coil 301 of the second switch 3 is linked with the second normally open contact 302, when the second coil 301 is powered on, the second normally open contact 302 is turned on, and when the second coil 301 is powered off, the second normally open contact 302 is turned off.

The third switch 6 may be used as a third relay, where the third coil 601 of the third switch 6 is linked with the third normally open contact 602, when the third coil 601 is powered on, the third normally open contact 602 is turned on, and when the third coil 601 is powered off, the third normally open contact 602 is turned off.

As shown in fig. 4 and 5, in some embodiments, the power supply circuit further includes an ac power source 8 and a switching power source 9 (Switch Mode Power Supply, SMPS), a power supply terminal of the switching power source 9 being connected to a power supply terminal of the ac power source 8, and a first power supply terminal of the switching power source 9 being connected to a first power supply terminal of the BMS4.

It can be understood that, because the power end of the switch power supply 9 is connected with the power supply end of the ac power supply 8, the switch power supply 9 can convert the ac power output by the ac power supply 8 into dc power, and because the first power supply end of the switch power supply 9 is connected with the first power supply end of the BMS4, the dc power output by the switch power supply 9 can supply power to the BMS4, thereby ensuring the stable operation of the BMS4 and further ensuring the stable operation of the dc side loop of the PCS 1.

It should be noted that, the ac power source 8 is configured to output ac power, the specific type of the ac power source 8 may be set according to actual needs, which is not limited thereto, and the ac power source 8 may have a live wire, a neutral wire, and a ground wire, and the ac power source 8 outputs 220V ac power, for example.

The switching power supply 9 is a high-frequency power conversion device, and has a function of converting a voltage of one level into a required voltage or current through different types of structures, wherein the input of the switching power supply 9 is an alternating current, and the output of the switching power supply 9 is a direct current. The specific type of the switching power supply 9 may be set according to actual needs, which is not limited, and the switching power supply 9 may convert 220V ac power into 24V dc power, for example.

Because the ac power source 8 directly outputs ac power, a large ac voltage exists between the live wire and the ground, which is easy to cause safety accidents such as electric shock.

As shown in fig. 4 and 5, in some embodiments, the power supply circuit further includes an isolation transformer 10, where the isolation transformer 10 is connected in series between the power supply terminal of the switching power supply 9 and the power supply terminal of the ac power supply 8, the power supply terminal of the isolation transformer 10 is connected to the power supply terminal of the ac power supply 8, and the first power supply terminal of the isolation transformer 10 is connected to the power supply terminal of the switching power supply 9.

It can be understood that, because the power end of the isolation transformer 10 is connected with the power supply end of the ac power source 8, the ac power output by the ac power source 8 needs to pass through the isolation transformer 10, wherein, under the conversion effect of the isolation transformer 10 from one to one, the ac power output by the ac power source 8 is converted into pure ac power, and because the power supply end of the isolation transformer 10 is not connected with the ground, no potential difference exists between any two lines of the ac power and the ground, thereby avoiding safety accidents such as electric shock and further improving the safety of the power supply circuit.

It should be noted that, the isolation transformer 10 refers to a transformer with an input winding electrically isolated from an output winding, and the specific type of the isolation transformer 10 may be set according to actual needs, which is not limited thereto.

As shown in fig. 4 and 5, in some embodiments, the power supply circuit further includes a connection terminal 11, where the connection terminal 11 is connected in series between the first power supply end of the isolation transformer 10 and the power supply end of the switching power supply 9, and the first end of the connection terminal 11 is connected to the first power supply end of the isolation transformer 10, and the second end of the connection terminal 11 is connected to the power supply end of the switching power supply 9.

It can be understood that, through the setting of binding post 11, be convenient for separate between isolation transformer 10 first power supply end and the switching power supply 9 power supply end when realizing linking to each other between isolation transformer 10 first power supply end and switching power supply 9 power supply end to make the power supply return circuit between isolation transformer 10 and the switching power supply 9 more nimble, it is more convenient to use.

It should be noted that the specific type of the connection terminal 11 may be set according to actual needs, which is not limited thereto, and the connection terminal 11 may be a fence connection terminal, in which when the first power supply terminal of the isolation transformer 10 has only the live wire and the neutral wire, only two paths of the connection terminal 11 are used.

As shown in fig. 4 and 5, in some embodiments, the power supply circuit further includes a UPS12 (Uninterruptible Power Supply ) and a battery 13, the power supply terminal of the UPS12 is connected to the second power supply terminal of the isolation transformer 10, the power supply terminal of the UPS12 is connected to the second power supply terminal of the BMS4, the power supply terminal of the battery 13 is connected to the power supply terminal of the UPS12, and the power supply terminal of the battery 13 is connected to the power supply terminal of the UPS 12.

It can be appreciated that, since the power end of the UPS12 is connected to the second power end of the isolation transformer 10, and the power end of the UPS12 is connected to the power end of the battery 13, the isolation transformer 10 supplies power to the switching power supply 9 and also supplies power to the UPS12, and the UPS12 can store the received electric energy in the battery 13, and meanwhile, since the power end of the battery 13 is connected to the power end of the UPS12, and the power end of the UPS12 is connected to the second power end of the BMS4, the UPS12 can transmit the stored electric energy in the battery 13 to the BMS4, thereby realizing power supply to the BMS4.

Therefore, when the isolation transformer 10 supplies power to the switch power supply 9 to supply power to the BMS4, the UPS12 stores part of electric energy output by the isolation transformer 10 in the storage battery 13, and when the power supply circuits of the isolation transformer 10, the switch power supply 9 and the BMS4 are disconnected due to faults, the UPS12 supplies power to the BMS4 by utilizing the electric energy stored in the storage battery 13 to ensure continuous operation of the BMS4 and further ensure stable and continuous operation of a direct current side circuit of the PCS 1.

It should be noted that, the UPS12 is configured to provide uninterrupted power, and the specific type of UPS12 may be set according to actual needs, which is not limited.

The storage battery 13 is used for storing and discharging electric energy, and the specific type of the storage battery 13 can be set according to actual needs, which is not limited.

As shown in fig. 5, in some embodiments, the power supply circuit further includes an EMS14 (Energy Management System ), the power supply terminal of the EMS14 is connected to the second power supply terminal of the switching power supply 9, the first output terminal of the EMS14 is connected to the second input terminal of the BMS4, the first input terminal of the EMS14 is connected to the fourth output terminal of the BMS4, the second output terminal of the EMS14 is connected to the first input terminal of the PCS1, the second input terminal of the EMS14 is connected to the first output terminal of the PCS1, the fifth output terminal of the BMS4 is connected to the second input terminal of the PCS1, and the third input terminal of the BMS4 is connected to the second output terminal of the PCS 1.

It will be appreciated that, since the first output terminal of the EMS14 is connected to the second input terminal of the BMS4, and the first input terminal of the EMS14 is connected to the fourth input terminal of the BMS4, communication between the EMS14 and the BMS4 is enabled, and, at the same time, since the second output terminal of the EMS14 is connected to the first input terminal of the PCS1, the second input terminal of the EMS14 is connected to the first output terminal of the PCS1, communication between the EMS14 and the PCS1 is enabled, and, since the fifth output terminal of the BMS4 is connected to the second input terminal of the PCS1, the third input terminal of the BMS4 is connected to the second output terminal of the PCS1, so that communication between the BMS4 and the PCS1 is enabled. Therefore, coordination among all devices in the power supply circuit is realized, and stable operation of a PCS1 direct-current side loop is ensured.

Wherein, because the power end of the EMS14 is connected with the second power supply end of the switching power supply 9, the switching power supply 9 can supply power to the EMS14, thereby ensuring the stable operation of the EMS 14.

It should be noted that, the EMS14 may send an instruction such as a power requirement to the PCS1, an instruction such as a schedule to the BMS4, the PCS1 and the BMS4 may respectively send feedback information to the EMS14, the BMS4 may send an instruction such as a switch to the PCS1, and the PCS1 may send an instruction such as a power requirement to the BMS4.

The EMS14 is used for being responsible for a control strategy of the system, and the control strategy influences the attenuation rate and the cycle life of a battery in the system, so that the economical efficiency of the system is determined, and is also used for monitoring fault abnormality in the system, playing an important role of timely and rapidly protecting equipment and guaranteeing safety, and the specific type of the EMS14 can be set according to actual needs, so that the method is not limited.

As shown in fig. 5, in some embodiments, the power supply circuit further includes an input display unit 15, a power supply terminal of the input display unit 15 is connected to the third power supply terminal of the switching power supply 9, an input terminal of the input display unit 15 is connected to the sixth output terminal of the BMS4, and an output terminal of the input display unit 15 is connected to the fourth input terminal of the BMS4.

It can be understood that, since the input end of the input display unit 15 is connected with the sixth output end of the BMS4, the BMS4 can display the states of the devices controlled by the input display unit 15 so as to facilitate the direct observation of the operator, and meanwhile, since the output end of the input display unit 15 is connected with the fourth input end of the BMS4, the BMS4 can receive the external input command by using the input display unit 15 so as to facilitate the direct control of the operator.

Wherein, because the power end of the input display unit 15 is connected with the third power supply end of the switching power supply 9, the switching power supply 9 can supply power to the input display unit 15, thereby ensuring the stable operation of the input display unit 15.

It should be noted that the specific type of the input display unit 15 may be set according to actual needs, which is not limited to this, and the input display unit 15 may be a display with a touch function, or may be a unit formed by combining devices such as a display, a mouse, and a keyboard.

As shown in fig. 6, the embodiment of the disclosure further provides a grid-connected outdoor energy storage system, which includes a battery cluster 16 and a power supply circuit according to the embodiment of the disclosure, wherein a positive electrode of a direct current side of a PCS1 of the power supply circuit is connected with a positive electrode of the battery cluster 16, a negative electrode of the direct current side of the PCS1 is connected with a negative electrode of the battery cluster 16, and an alternating current side of the PCS1 is connected with a power grid.

It can be understood that, because the first switch 2 is connected in series with the positive pole of the dc side of the PCS1, and the second switch 3 is connected in series with the negative pole of the dc side of the PCS1, the on-off of the first switch 2 and the second switch 3 can control the on-off of the dc side loop of the PCS1, and because the first output end of the BMS4 is connected with the input end of the first switch 2, the second output end of the BMS4 is connected with the input end of the second switch 3, the BMS4 can control the on-off of the first switch 2 and the second switch 3, thereby realizing the on-off control of the dc side loop of the PCS1, and further realizing the charge and discharge control of the battery cluster 16.

It should be noted that, the battery cluster 16 is formed by connecting a plurality of battery packs in series, and the battery packs are formed by connecting a plurality of unit cells in series and/or in parallel.

The specific type of the power grid can be set according to actual needs, and the power grid can be a three-phase three-wire system or a three-phase four-wire system by way of example, and the alternating current side of the PCS1 can transmit 380V alternating current to the power grid.

As shown in fig. 6, in some embodiments, the battery pack 16 includes a liquid cooling unit 161, a power terminal of the liquid cooling unit 161 is connected to a third power terminal of the isolation transformer 10 of the power supply circuit, an input terminal of the liquid cooling unit 161 is connected to a seventh output terminal of the BMS4, and an output terminal of the liquid cooling unit 161 is connected to a fifth input terminal of the BMS4.

It can be understood that, because the power end of the liquid cooling unit 161 is connected with the third power supply end of the isolation transformer 10 of the power supply circuit, the isolation transformer 10 can supply power to the liquid cooling unit 161, so as to ensure that the liquid cooling unit 161 stably cools the battery cluster 16, and because the input end of the liquid cooling unit 161 is connected with the seventh output end of the BMS4, the output end of the liquid cooling unit 161 is connected with the fifth input end of the BMS4, so that communication between the liquid cooling unit 161 and the BMS4 can be realized, and further, the accurate cooling of the liquid cooling unit 161 to the battery cluster 16 is ensured.

It should be noted that, the liquid cooling unit 161 is configured to cool the battery pack 16 by a liquid circulation manner, and the specific type of the liquid cooling unit 161 may be set according to actual needs, which is not limited.

As shown in fig. 6, in some embodiments, the battery pack 16 includes a fire-fighting unit 162, the fire-fighting unit 162 includes a gas sensor 1621 and a fire-extinguishing device 1622, wherein a power supply terminal of the gas sensor 1621 is connected to a fourth power supply terminal of the switching power supply 9 of the power supply circuit, an output terminal of the gas sensor 1621 is connected to a sixth input terminal of the BMS4 of the power supply circuit, a power supply terminal of the fire-extinguishing device 1622 is connected to a fifth power supply terminal of the switching power supply 9, and an input terminal of the fire-extinguishing device 1622 is connected to an eighth output terminal of the BMS4.

It can be understood that, since the power end of the gas sensor 1621 is connected to the fourth power end of the switching power supply 9 of the power supply circuit, and the power end of the fire extinguishing device 1622 is connected to the fifth power end of the switching power supply 9, the switching power supply 9 can supply power to the gas sensor 1621 and the fire extinguishing device 1622, so that the stable operation of the fire extinguishing unit 162 is ensured, and since the output end of the gas sensor 1621 is connected to the sixth input end of the BMS4 of the power supply circuit, the input end of the fire extinguishing device 1622 is connected to the eighth output end of the BMS4, the BMS4 can obtain the gas information in the battery cluster 16 by using the gas sensor 1621, and then the switch of the fire extinguishing device 1622 is controlled according to the obtained gas information, so as to ensure the safe operation of the battery cluster 16.

Note that, the gas sensor 1621 is used to detect a thermal runaway gas in the battery cluster 16, and the specific type of the gas sensor 1621 may be set according to actual needs, and the gas sensor 1621 may be, for example, a sensor that detects carbon dioxide, a sensor that detects carbon monoxide, or the like, without limitation.

The fire extinguishing device 1622 is used for performing fire extinguishing operation according to the command sent by the BMS4, and the specific type of the fire extinguishing device 1622 may be set according to actual needs, which is not limited.

In the description of the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the present disclosure.

Claims

1. A power supply circuit, comprising:

an energy storage converter PCS;

the first switch is connected in series with the positive electrode of the direct-current side of the PCS;

the second switch is connected in series with the direct-current side negative electrode of the PCS;

the battery management system BMS, BMS's first output with the input of first switch links to each other, BMS's second output with the input of second switch links to each other.

2. The power supply circuit of claim 1, wherein the power supply circuit further comprises:

the current limiting resistor is connected with the first switch in parallel;

and the third switch is connected with the current limiting resistor in series, the third switch is connected with the first switch in parallel, and the input end of the third switch is connected with the third output end of the BMS.

3. The power supply circuit of claim 2, wherein the power supply circuit further comprises:

and the shunt is connected with the second switch in series, and the output end of the shunt is connected with the first input end of the BMS.

4. The power supply circuit of claim 2, wherein,

the first switch includes: the input end of the first coil is connected with the first output end of the BMS, the first normally open contact is connected in series with the positive pole of the direct current side of the PCS, and the current limiting resistor is connected in parallel with the first normally open contact;

the second switch includes: the input end of the second coil is connected with the second output end of the BMS, and the second normally open contact is connected in series with the direct-current side negative electrode of the PCS;

the third switch includes: the input end of the third coil is connected with the third output end of the BMS, the third normally open contact is connected with the current limiting resistor in series, and the third normally open contact is connected with the first normally open contact in parallel.

5. The power supply circuit according to any one of claims 1 to 4, characterized in that the power supply circuit further comprises:

an alternating current power supply;

the power supply end of the switching power supply is connected with the power supply end of the alternating current power supply, and the first power supply end of the switching power supply is connected with the first power supply end of the BMS.

6. The power supply circuit of claim 5, further comprising:

the isolation transformer is connected in series between the power end of the switching power supply and the power supply end of the alternating current power supply, the power end of the isolation transformer is connected with the power supply end of the alternating current power supply, and the first power supply end of the isolation transformer is connected with the power supply end of the switching power supply.

7. The power supply circuit of claim 6, wherein the power supply circuit further comprises:

the wiring terminal is connected in series between the first power supply end of the isolation transformer and the power supply end of the switching power supply, the first end of the wiring terminal is connected with the first power supply end of the isolation transformer, and the second end of the wiring terminal is connected with the power supply end of the switching power supply.

8. The power supply circuit of claim 6, wherein the power supply circuit further comprises:

the power supply end of the UPS is connected with the second power supply end of the isolation transformer, and the power supply end of the UPS is connected with the second power supply end of the BMS;

the power supply end of the storage battery is connected with the power supply end of the UPS, and the power supply end of the storage battery is connected with the power supply end of the UPS.

9. The power supply circuit of claim 5, further comprising:

the energy management system EMS, the power end of the EMS is connected with the second power supply end of the switching power supply, the first output end of the EMS is connected with the second input end of the BMS, the first input end of the EMS is connected with the fourth output end of the BMS, the second output end of the EMS is connected with the first input end of the PCS, and the second input end of the EMS is connected with the first output end of the PCS;

the fifth output end of the BMS is connected with the second input end of the PCS, and the third input end of the BMS is connected with the second output end of the PCS.

10. The power supply circuit of claim 5, further comprising:

the power end of the input display unit is connected with the third power supply end of the switching power supply, the input end of the input display unit is connected with the sixth output end of the BMS, and the output end of the input display unit is connected with the fourth input end of the BMS.

11. A grid-tied outdoor energy storage system, comprising:

a battery cluster;

the power supply circuit of any of claims 1-10, wherein a positive pole of a PCS dc side of the power supply circuit is connected to a positive pole of the battery cluster, a negative pole of the PCS dc side is connected to a negative pole of the battery cluster, and an ac side of the PCS is connected to a power grid.

12. The grid-tied outdoor energy storage system of claim 11, wherein the battery cluster comprises:

the power end of the liquid cooling unit is connected with the third power supply end of the isolation transformer of the power supply circuit, the input end of the liquid cooling unit is connected with the seventh output end of the BMS, and the output end of the liquid cooling unit is connected with the fifth input end of the BMS.

13. The grid-tied outdoor energy storage system of claim 11, wherein the battery cluster comprises:

a fire fighting unit, the fire fighting unit comprising: a gas sensor and a fire extinguishing device;

the power end of the gas sensor is connected with the fourth power supply end of the switching power supply of the power supply circuit, and the output end of the gas sensor is connected with the sixth input end of the BMS of the power supply circuit;

the power end of the fire extinguishing device is connected with the fifth power supply end of the switching power supply, and the input end of the fire extinguishing device is connected with the eighth output end of the BMS.