Energy storage power supply system control circuit and energy storage power supply system high-voltage box

Abstract

The utility model relates to an energy storage system, and provides an energy storage power supply system control circuit and an energy storage power supply system high-voltage box. The energy storage power supply system control circuit comprises a low-voltage control loop and a high-voltage power supply loop, the high-voltage power supply loop comprises a positive output loop, a negative output loop and a circuit breaker arranged on the positive output loop and the negative output loop, the positive output loop is connected with a positive electrode pre-charging loop in parallel, and a first end of a main contact of a pre-charging positive contactor is electrically connected with a first input end of the circuit breaker; the second end of the main contact is electrically connected with the first output end of the circuit breaker through the pre-charging resistor, and the coil is connected with protection equipment; the negative output loop is connected in parallel with a negative electrode pre-charging loop, a first end of a main contact of the pre-charging negative contactor is electrically connected with a second input end of the circuit breaker, a second end of the main contact is electrically connected with a second output end of the circuit breaker, and a coil of the pre-charging negative contactor is connected with protection equipment. The control circuit of the energy storage power supply system can meet the design requirements of high voltage and large current, has the function of a pre-charging loop, and has the advantages of safety, reliability and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, in particular to an energy storage power supply system control circuit and an energy storage power supply system high-voltage box. Background Art

[0002] In energy storage power supply systems with high voltage and high current requirements, there are conditions of high-rate pulse discharge or cluster-off operation. Under this condition, the voltage of a single battery cluster can reach DC1500V, and the current can reach 1500A or more. At this time, the power circuit design needs to select main positive and main negative contactors that meet high voltage and high current conditions, but there are very few types of high-voltage and high-current contactors on the market. Some can meet the voltage and current requirements, but the main contacts are polarized. The current direction is opposite when the power system is charging and discharging. If the contactor with polarized main contacts is set in the power circuit, the main contact material of the contactor will be damaged, which will affect the safety and reliability of the system.

[0003] In addition, if the system is in an emergency fault state, the power circuit may be cut off under power. When the contactor is cut off under high current operation conditions, arcing will occur, causing electric shock and adhesion, and the disconnection cannot be completed, resulting in greater safety accidents. Utility Model Content

[0004] The utility model provides an energy storage power supply system control circuit and an energy storage power supply system high-voltage box. The energy storage power supply system control circuit can meet the design requirements of high voltage and large current, and has a pre-charging loop function, has the advantages of safety and reliability, and can be widely used in actual energy storage projects.

[0005] In order to achieve the above object, the utility model provides the following technical solutions:

[0006] According to a first aspect of the utility model, a control circuit of an energy storage power supply system is provided, comprising: a low-voltage control circuit and a high-voltage power supply circuit, wherein the low-voltage control circuit comprises a protection device, and the low-voltage control circuit controls the high-voltage power supply circuit through the protection device; the high-voltage power supply circuit comprises a positive output circuit, a negative output circuit, and a circuit breaker arranged on the positive output circuit and the negative output circuit, wherein the circuit breaker comprises a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein:

[0007] The positive output loop comprises a first end and a second end, wherein the first end of the positive output loop is used to connect to the positive electrode of the high voltage power supply; the second end of the positive output loop is used to connect to the first end of the load;

[0008] The negative output loop comprises a first end and a second end, wherein the first end of the negative output loop is used to connect to the negative electrode of the high voltage power supply; the second end of the negative output loop is used to connect to the second end of the load;

[0009] The positive output circuit is connected in parallel with a positive pre-charging circuit, the positive pre-charging circuit includes a pre-charging positive contactor and a pre-charging resistor, the pre-charging positive contactor includes a main contact and a coil, the main contact of the pre-charging positive contactor includes a first end and a second end, the first end of the main contact of the pre-charging positive contactor is electrically connected to the first input end of the circuit breaker, and the second end of the main contact of the pre-charging positive contactor is electrically connected to the first output end of the circuit breaker through the pre-charging resistor; the coil of the pre-charging positive contactor is connected to the protection device, and is used for switching on and off under the control of the protection device;

[0010] The negative output circuit is connected in parallel with a negative pre-charging circuit, and the negative pre-charging circuit includes a pre-charging negative contactor. The pre-charging negative contactor includes a main contact and a coil. The main contact of the pre-charging negative contactor includes a first end and a second end. The first end of the main contact of the pre-charging negative contactor is electrically connected to the second input end of the circuit breaker, and the second end of the main contact of the pre-charging negative contactor is electrically connected to the second output end of the circuit breaker; the coil of the pre-charging negative contactor is connected to a protection device for switching on and off under the control of the protection device.

[0011] According to a second aspect of the present utility model, a high-voltage box of an energy storage power supply system is provided, comprising an energy storage power supply system control circuit as provided by any technical solution in the first aspect above.

[0012] It should be noted that the energy storage power system control circuit provided by the present application controls the high-voltage power supply circuit through a low-voltage control circuit, which can ensure the safety performance of the circuit. In addition, the energy storage power system control circuit provided by the present application sets a circuit breaker in the high-voltage power supply circuit, and controls the on / off of the positive output circuit and the negative output circuit through the circuit breaker, which can solve the problem of difficult selection of high-voltage and high-current contactors and reduce the difficulty of design selection. At the same time, the main positive contactor and the main negative contactor are not set in the high-voltage power supply circuit, which can avoid the problem of the power circuit being unable to be cut off due to contactor failure. Accordingly, since the circuit breaker has the ability to cut off with load, the electrical life can be significantly improved, thereby improving the reliability of circuit operation, as well as reducing circuit failure points and reducing maintenance costs.

[0013] In addition, the energy storage power system control circuit provided in the present application sets up a positive pre-charging circuit and a negative pre-charging circuit in the high-voltage power supply circuit, and adds a pre-charging positive contactor and a pre-charging negative contactor, which can ensure that the pre-charging function is realized before the power circuit is connected, so as to protect the power equipment, extend the service life of the power equipment and improve the system stability.

[0014] Therefore, the energy storage power system control circuit can meet the design requirements of high voltage and high current, and also has the function of pre-charging circuit. It has the advantages of safety and reliability, and can be widely used in actual energy storage projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0016] Figure 1 A circuit diagram of an energy storage power supply system provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of the medium and high voltage control circuit;

[0018] Figure 3 for Figure 2 A specific schematic diagram of a medium and high voltage control circuit;

[0019] Figure 4 for Figure 1 Circuit breaker wiring terminal diagram.

[0020] The following are the descriptions of the reference numerals:

[0021] 100, low voltage control circuit; 200, high voltage power supply circuit; 300, high voltage power supply; 400, load; 500, low voltage power supply. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0023] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0024] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0025] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0026] In a first aspect, an embodiment of the present application provides an energy storage power system control circuit. The energy storage power system control circuit includes: a low voltage control circuit 100 and a high voltage power supply circuit 200 . Figure 1 A circuit diagram of an energy storage power supply system provided in an embodiment of the present application; Figure 2 for Figure 1 A magnified schematic diagram of the medium and high voltage control circuit. Please refer to Figure 1 and Figure 2 The low voltage control circuit 100 includes a protection device, and the low voltage control circuit 100 controls the high voltage power supply circuit 200 through the protection device. The high voltage power supply circuit 200 includes a positive output circuit, a negative output circuit, and a circuit breaker QF arranged on the positive output circuit and the negative output circuit, and the circuit breaker QF includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal.

[0027] Please continue to refer to Figure 1 and Figure 2 The positive output circuit includes a first end and a second end, wherein the first end of the positive output circuit is used to connect to the positive electrode of the high voltage power supply 300; and the second end of the positive output circuit is used to connect to the first end of the load 400;

[0028] The negative output loop includes a first end and a second end, wherein the first end of the negative output loop is used to connect to the negative electrode of the high voltage power supply 300; and the second end of the negative output loop is used to connect to the second end of the load 400;

[0029] The positive output circuit is connected in parallel with a positive pre-charging circuit, the positive pre-charging circuit includes a pre-charging positive contactor KM1 and a pre-charging resistor R1, the pre-charging positive contactor KM1 includes a main contact and a coil, the main contact of the pre-charging positive contactor KM1 includes a first end and a second end, the first end of the main contact of the pre-charging positive contactor KM1 is electrically connected to the first input end of the circuit breaker QF, and the second end of the main contact of the pre-charging positive contactor KM1 is electrically connected to the first output end of the circuit breaker QF through the pre-charging resistor R1; the coil of the pre-charging positive contactor KM1 is connected to the protection device, and is used for switching under the control of the protection device;

[0030] The negative output circuit is connected in parallel with a negative pole pre-charging circuit, which includes a pre-charging negative contactor KM2. The pre-charging negative contactor KM2 includes a main contact and a coil. The main contact of the pre-charging negative contactor KM2 includes a first end and a second end. The first end of the main contact of the pre-charging negative contactor KM2 is electrically connected to the second input end of the circuit breaker QF, and the second end of the main contact of the pre-charging negative contactor KM2 is electrically connected to the second output end of the circuit breaker QF; the coil of the pre-charging negative contactor KM2 is connected to the protection device for switching on and off under the control of the protection device.

[0031] It can be understood that the circuit breaker QF refers to a switching device that can close, carry and interrupt the current under normal circuit conditions, and can close, carry and interrupt the current under abnormal circuit conditions within a specified time.

[0032] The energy storage power supply system control circuit provided in the embodiment of the present application controls the high-voltage power supply circuit 200 through the low-voltage control circuit 100, which can ensure the safety performance of the circuit. In addition, the energy storage power supply system control circuit provided in the embodiment of the present application sets a circuit breaker QF in the high-voltage power supply circuit 200, and controls the on / off of the positive output circuit and the negative output circuit through the circuit breaker QF, which can solve the problem of difficult selection of high-voltage and high-current contactors and reduce the difficulty of design selection. At the same time, the main positive contactor and the main negative contactor are not set in the high-voltage power supply circuit 200, which can avoid the problem of the power circuit being unable to be cut off due to contactor failure. Accordingly, since the circuit breaker QF has the ability to cut off with load, the electrical life can be significantly improved, thereby improving the reliability of circuit operation, as well as reducing circuit failure points and reducing maintenance costs.

[0033] In addition, the energy storage power system control circuit provided in the embodiment of the present application sets a positive pre-charging circuit and a negative pre-charging circuit in the high-voltage power supply circuit 200, and adds a pre-charging positive contactor KM1 and a pre-charging negative contactor KM2, which can ensure that the pre-charging function is realized before the power circuit is connected, so as to protect the power equipment, extend the service life of the power equipment and improve the system stability.

[0034] Therefore, the energy storage power system control circuit can meet the design requirements of high voltage and high current, and also has the function of pre-charging circuit. It has the advantages of safety and reliability, and can be widely used in actual energy storage projects.

[0035] It is worth noting that Figure 3 for Figure 2 A specific schematic diagram of a medium and high voltage control circuit. Figure 3 As shown, the high-voltage power supply 300 can be a battery cluster; the load 400 can be a PCS (Power Conversion System). When the load 400 is a PCS, the PCS and the battery cluster perform a bidirectional action to control the circuit. Of course, the high-voltage power supply 300 can also be other power supply structures; the load 400 can also be other external power-consuming devices, which will not be described in detail.

[0036] As an example, in a lithium battery energy storage system, the charge and discharge control of the lithium battery system can be achieved through PCS. There is a capacitor with a large capacity in the PCS. If the capacitor voltage is 0 before power-on, that is, there is no energy in the capacitor, then at the moment of circuit closure, since the voltage across the capacitor will not change suddenly, the circuit is equivalent to a direct short circuit. If such a large short-circuit current is not limited, it will cause a huge impact and damage to the devices (such as contactors and cables) in the high-voltage power supply circuit 200 and components such as batteries. Therefore, the embodiment of the present application provides a pre-charging circuit in the high-voltage power supply circuit 200 to reduce the impact current when powering on and protect the components in the system.

[0037] In one embodiment, please continue to refer to Figure 2 In the structure shown, the protection device includes a positive power supply access terminal and a negative power supply access terminal, the positive power supply access terminal is used to connect the positive pole of the low-voltage power supply 500, and the negative power supply access terminal is used to connect the negative pole of the low-voltage power supply 500. Exemplarily, the voltage of the low-voltage power supply 500 is DC24V, specifically, the direct current voltage is 24V.

[0038] Please continue to refer to Figure 2 In the structure shown, the protection device also includes a negative pole connection port, a positive pole connection port, an input feedback interface and an output control interface.

[0039] Specifically, the negative connection port and the negative power supply access terminal are marked as "V-", and the potential of the negative connection port is the same as the potential of the negative power supply access terminal; the positive connection port and the positive power supply access terminal are marked as "V+", and the potential of the positive connection port is the same as the potential of the positive power supply access terminal. The input feedback interface is referred to as the DI interface, and the output control interface is referred to as the DO interface.

[0040] In addition, the DI interface and DO interface can be further divided according to the level. For example, the high-level DO interface is marked with H, and the low-level DO interface is marked with L. When one end of the device is connected to the low-level DO interface or DI interface, the other end needs to be connected to the negative connection port V-. When one end of the device is connected to the high-level DO interface or DI interface, the other end needs to be connected to the positive connection port V+.

[0041] In one embodiment, please continue to combine Figure 1 refer to Figure 2 In the structure shown, the pre-charge positive contactor KM1 also includes an auxiliary contact, and the auxiliary contact of the pre-charge positive contactor KM1 includes a first end and a second end, the first end of the auxiliary contact of the pre-charge positive contactor KM1 is connected to the negative connection port V- of the protection device, and the second end of the auxiliary contact of the pre-charge positive contactor KM1 is connected to the input feedback interface DI1L of the protection device;

[0042] The pre-charge negative contactor KM2 also includes an auxiliary contact, which includes a first end and a second end. The first end of the auxiliary contact of the pre-charge negative contactor KM2 is connected to the negative connection port V- of the protection device, and the second end of the auxiliary contact of the pre-charge negative contactor KM2 is connected to the input feedback interface DI2L of the protection device.

[0043] It should be noted that, in this embodiment, the protection device can judge the state of the pre-charge positive contactor KM1 by sampling the feedback contact signal of the pre-charge positive contactor KM1. Similarly, the protection device can judge the state of the pre-charge negative contactor KM2 by sampling the feedback contact signal of the pre-charge positive contactor KM1.

[0044] In one embodiment, please continue to combine Figure 1 refer to Figure 2 In the structure shown, the coil of the pre-charge positive contactor KM1 includes a first end and a second end, the first end of the coil of the pre-charge positive contactor KM1 is connected to the negative connection port V- of the protection device, and the second end of the coil of the pre-charge positive contactor KM1 is connected to the output control interface DO1H of the protection device;

[0045] The coil of the pre-charging negative contactor KM2 includes a first end and a second end. The first end of the coil of the pre-charging negative contactor KM2 is connected to the negative connection port V- of the protection device, and the second end of the coil of the pre-charging negative contactor KM2 is connected to the output control interface DO2H of the protection device.

[0046] Specifically, when the coil of the pre-charging positive contactor KM1 is energized, the main contacts of the pre-charging positive contactor KM1 are closed, and at this time, the positive pre-charging circuit is turned on; similarly, when the coil of the pre-charging negative contactor KM2 is energized, the main contacts of the pre-charging negative contactor KM2 are closed, and at this time, the negative pre-charging circuit is turned on.

[0047] It is worth noting that when the coil of the pre-charge positive contactor KM1 and the coil of the pre-charge negative contactor KM2 are energized through the protection device, the coil of the pre-charge negative contactor KM2 is generally energized first.

[0048] In order to reduce the number of ports on the surface of the protection device and improve the overall integration of the device, the first end of the pre-charge positive contactor KM1 and the first end of the pre-charge negative contactor KM2 can share the same negative electrode connection port V-.

[0049] In one embodiment, Figure 4 for Figure 1 Please refer to the wiring terminal diagram of the circuit breaker in Figure 1 and Figure 2 refer to Figure 4 In the structure shown, the circuit breaker QF includes a common switch S1, a closing switch S2 and an opening switch S3, the common switch S1 and the closing switch S2 are connected through a first control switch KA1, and the common switch S1 and the opening switch S3 are connected through a second control switch KA2;

[0050] The first control switch KA1 also includes a control end, the control end of the first control switch KA1 includes a first end and a second end, the first end of the control end of the first control switch KA1 is connected to the positive electrode connection port V+, and the second end of the control end of the first control switch KA1 is connected to the output control interface DO4L;

[0051] The second control switch KA2 also includes a control end, which includes a first end and a second end. The first end of the control end of the second control switch KA2 is connected to the positive connection port V+, and the second end of the control end of the second control switch KA2 is connected to the output control interface DO4L.

[0052] It is understandable that in order to reduce the number of ports on the surface of the protection device and improve the overall integration of the device, the first end of the control end of the first control switch KA1 and the first end of the control end of the second control switch KA2 can share the same positive connection port V+.

[0053] It should be noted that in the energy storage power system control circuit provided in the embodiment of the present application, the circuit breaker QF opening and closing control circuit is interlocked, which can avoid the failure of the circuit breaker QF control to improve the safety performance of the control circuit. Specifically, the high-voltage power supply circuit 200 provided in this embodiment controls the opening / closing of the first control switch KA1 and the opening / closing of the second control switch KA2 through the protection device, and then controls the relay QF to perform opening and closing operations. For example, when the coil of the first control switch KA1 is energized by the protection device, the control end of the first control switch KA1 is closed, and at this time, the closing switch S2 is closed and closed; when the coil of the second control switch KA2 is energized by the protection device, the control end of the second control switch KA2 is closed, and at this time, the opening switch S3 is closed and closed.

[0054] It is worth noting that when the coil of the first control switch KA1 and the coil of the second control switch KA2 are controlled by the protection device, the coil of the first control switch KA1 and the coil of the second control switch KA2 are not energized at the same time.

[0055] In one embodiment, please continue to combine Figure 1 and Figure 2 refer to Figure 4 In the structure shown, the circuit breaker QF also includes a common auxiliary contact F11, a normally open auxiliary contact F14 and a normally closed auxiliary contact F12. The common auxiliary contact F11 is connected to another input feedback interface DI1L of the protection device, and the normally open auxiliary contact F14 is connected to the negative connection port V- of the protection device.

[0056] It should be noted that, in this embodiment, the protection device can judge the state of the circuit breaker QF by sampling the feedback contact signal of the circuit breaker QF. For example, when the coil of the first control switch KA1 is energized, the normally open contact of the control end of the first control switch KA1 is turned on, and the circuit breaker QF is closed. At this time, the normally open dry contact of the circuit breaker feedback dry contact becomes normally closed, and the protection device can detect the change of the state of the DI1L and V- interfaces to perform corresponding actions.

[0057] In one embodiment, please continue to refer to Figure 4 In the structure shown, the circuit breaker QF includes a motor M, a first connection terminal P1 and a second connection terminal P2, the first connection terminal P1 is used to connect the negative pole of the low-voltage power supply 500, the second connection terminal P2 is used to connect the positive pole of the low-voltage power supply 500, and the first connection terminal P1 and the second connection terminal P2 are connected to the motor M to provide electrical energy to the motor M; the start / close of the motor M is controlled by the common switch S1, the closing switch S2 and the opening switch S3.

[0058] It is understandable that the low-voltage power supply 500 connected to the first connection terminal P1 and the second connection terminal P2 can also be DC24V by way of example. Of course, the specific voltage can be adjusted according to the requirements and is not limited thereto. The first connection terminal P1 and the second connection terminal P2 supply power to the motor M, while the common switch S1, the closing switch S2 and the opening switch S3 control whether the motor M is turned on / off. For example, after the main contact of the first control switch KA1 is closed, the common switch S1 and the closing switch S2 are turned on, and after the controller in the circuit breaker QF receives the conduction signal, it controls the motor M to operate, and the power circuit of the circuit breaker QF is closed and turned on.

[0059] It should be noted that in this embodiment, the manual operation of the circuit breaker QF is changed to electric operation. Specifically, the power circuit changes the manual circuit breaker QF to a circuit breaker QF with electric operation function, which can realize the automation of power on and off processes and automatic power on or off.

[0060] Please continue to refer to Figures 1 to 4 In the structure shown, in the energy storage power system control loop provided in the embodiment of the present application, the specific operation process of the low-voltage control loop 100 is as follows. Turn on the low-voltage power supply 500 to supply power, and the protection device is powered on by low-voltage power. Then the protection device performs self-test, and the self-test items include protection device self-test, battery status self-test, system status, etc. Among them, the protection device self-test items include but are not limited to slave communication and cable shedding, mainboard power supply failure, drive circuit failure, total voltage detection circuit failure, insulation detection failure, etc.; the system status self-test includes detecting the status of the pre-charge positive contactor KM1, the pre-charge negative contactor KM2, and the circuit breaker QF by detecting the input of the input feedback interface DI of the protection device. If the self-test fails, the protection device reports the corresponding fault and disconnects all contactors and circuit breakers QF. If the self-test is successful, the protection device first controls the pre-charge negative contactor KM2 to close, and then closes the pre-charge positive contactor KM1. When the voltage at one end of the load 400 is close to the voltage of the battery system (such as a battery cluster), the pre-charge ends. The protection device controls DO4L and V+ interface to output DC24V voltage, the coil of the first control switch KA1 is energized, the normally open contact of the first control switch KA1 is turned on, and the circuit breaker QF is closed. At this time, the normally open dry contact of the circuit breaker QF feedback dry contact becomes normally closed (that is, F11 changes from connecting F14 to connecting F12). After the protection device detects the change in the status of DI1L and V- interface, it delays 1S and disconnects the pre-charge positive contactor KM1 and the pre-charge negative contactor KM2.

[0061] When the power is turned off normally, the protection device can control the DO5L and V+ interfaces to output DC24V voltage, and disconnect the DO4L and V+ interface outputs at the same time, so that the coil of the second control switch KA2 is energized, the normally open contact of the second control switch KA2 is turned on, and the contact of the first control switch KA1 is disconnected. At this time, the circuit breaker QF is opened, and the protection device completes the system power-off after detecting that the status of DI1L and V- interface changes from on to off.

[0062] In one embodiment, please continue to refer to Figure 2 In the structure shown, the circuit breaker QF further includes a shunt trip assembly, which includes a shunt release, a first connection terminal C1 and a second connection terminal C2, wherein the first connection terminal C1 is used to connect to the negative electrode of the low-voltage power supply 500 through the third control switch KA3, and the second connection terminal C2 is used to connect to the positive electrode of the low-voltage power supply 500;

[0063] The third control switch KA3 also includes a coil, which includes a first end and a second end. The first end of the coil of the third control switch KA3 is connected to the negative connection port of the protection device, and the second end of the coil of the third control switch KA3 is connected to the output control interface DO3H of the protection device.

[0064] In order to prevent the first control switch KA1 and the second control switch KA2 used for opening from failing, the protection device also controls the coil of the third control switch KA3 by controlling the DO3H and V-interface outputs, and then controls the shunt release in the circuit breaker QF to be energized to trip the circuit breaker QF, thereby ensuring reliable disconnection in the system under emergency conditions.

[0065] It should be noted that the protection device provided in this embodiment is controlled in two ways. Specifically, it is controlled through the opening circuit of the circuit breaker QF and the shunt release, which can increase the reliability of system power-off.

[0066] In one embodiment, the protection device is a battery management system (BMS). BMS can help the pure power system control loop to achieve accurate status monitoring, prediction, protection and other functions, thereby improving the overall reliability and life.

[0067] In a second aspect, an embodiment of the present application provides a high-voltage box for an energy storage power supply system. The high-voltage box for the energy storage power supply system includes an energy storage power supply system control circuit as provided by any technical solution in the first aspect.

[0068] In the high-voltage box of the energy storage power supply system provided in the embodiment of the present application, the energy storage power supply system control circuit controls the high-voltage power supply circuit 200 through the low-voltage control circuit 100, which can ensure the safety performance of the circuit. In addition, the energy storage power supply system control circuit sets a circuit breaker QF in the high-voltage power supply circuit 200, and controls the on / off of the positive output circuit and the negative output circuit through the circuit breaker QF, which can solve the problem of difficult selection of high-voltage and high-current contactors and reduce the difficulty of design selection. At the same time, the main positive contactor and the main negative contactor are not set in the high-voltage power supply circuit 200, which can avoid the problem of the power circuit being unable to be cut off due to contactor failure. Accordingly, since the circuit breaker QF has the ability to cut off with load, the electrical life can be significantly improved, thereby improving the reliability of circuit operation, as well as reducing circuit failure points and reducing maintenance costs.

[0069] In addition, the energy storage power system control circuit sets a positive pre-charging circuit and a negative pre-charging circuit in the high-voltage power supply circuit 200, and adds a pre-charging positive contactor KM1 and a pre-charging negative contactor KM2, which can ensure that the pre-charging function is realized before the power circuit is connected, so as to protect the power equipment, extend the service life of the power equipment and improve the system stability.

[0070] Therefore, the energy storage power system control circuit can meet the design requirements of high voltage and high current, and also has the function of pre-charging circuit. It has the advantages of safety and reliability, and can be widely used in actual energy storage projects.

[0071] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0072] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A control circuit for an energy storage power supply system, characterized in that: include: A low-voltage control circuit and a high-voltage power supply circuit, wherein the low-voltage control circuit includes a protection device, and the low-voltage control circuit controls the high-voltage power supply circuit through the protection device; the high-voltage power supply circuit includes a positive output circuit, a negative output circuit, and a circuit breaker arranged on the positive output circuit and the negative output circuit, and the circuit breaker includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal, wherein: The positive output loop comprises a first end and a second end, wherein the first end of the positive output loop is used to connect to the positive electrode of the high voltage power supply; the second end of the positive output loop is used to connect to the first end of the load; The negative output loop comprises a first end and a second end, wherein the first end of the negative output loop is used to connect to the negative electrode of the high voltage power supply; the second end of the negative output loop is used to connect to the second end of the load; The positive output circuit is connected in parallel with a positive pre-charging circuit, the positive pre-charging circuit includes a pre-charging positive contactor and a pre-charging resistor, the pre-charging positive contactor includes a main contact and a coil, the main contact of the pre-charging positive contactor includes a first end and a second end, the first end of the main contact of the pre-charging positive contactor is electrically connected to the first input end of the circuit breaker, and the second end of the main contact of the pre-charging positive contactor is electrically connected to the first output end of the circuit breaker through the pre-charging resistor; the coil of the pre-charging positive contactor is connected to the protection device, and is used for switching on and off under the control of the protection device; The negative output circuit is connected in parallel with a negative pre-charging circuit, and the negative pre-charging circuit includes a pre-charging negative contactor. The pre-charging negative contactor includes a main contact and a coil. The main contact of the pre-charging negative contactor includes a first end and a second end. The first end of the main contact of the pre-charging negative contactor is electrically connected to the second input end of the circuit breaker, and the second end of the main contact of the pre-charging negative contactor is electrically connected to the second output end of the circuit breaker; the coil of the pre-charging negative contactor is connected to a protection device for switching on and off under the control of the protection device.

2. The energy storage power supply system control circuit according to claim 1, characterized in that: The protection device comprises a positive power supply access terminal and a negative power supply access terminal, wherein the positive power supply access terminal is used to connect to the positive pole of the low-voltage power supply, and the negative power supply access terminal is used to connect to the negative pole of the low-voltage power supply; The protection device also includes a negative electrode connection port, a positive electrode connection port, an input feedback interface and an output control interface.

3. The energy storage power system control circuit according to claim 2, characterized in that: The pre-charged positive contactor further includes an auxiliary contact, the auxiliary contact of the pre-charged positive contactor includes a first end and a second end, the first end of the auxiliary contact of the pre-charged positive contactor is connected to the negative connection port of the protection device, and the second end of the auxiliary contact of the pre-charged positive contactor is connected to the input feedback interface of the protection device; The pre-charge negative contactor also includes an auxiliary contact, which includes a first end and a second end. The first end of the auxiliary contact of the pre-charge negative contactor is connected to the negative connection port of the protection device, and the second end of the auxiliary contact of the pre-charge negative contactor is connected to the input feedback interface of the protection device.

4. The energy storage power supply system control circuit according to claim 2, characterized in that: The coil of the pre-charge positive contactor includes a first end and a second end, the first end of the coil of the pre-charge positive contactor is connected to the negative connection port of the protection device, and the second end of the coil of the pre-charge positive contactor is connected to the output control interface of the protection device; The coil of the pre-charge negative contactor includes a first end and a second end, the first end of the coil of the pre-charge negative contactor is connected to the negative connection port of the protection device, and the second end of the coil of the pre-charge negative contactor is connected to the output control interface of the protection device.

5. The energy storage power system control circuit according to claim 2, characterized in that: The circuit breaker comprises a common switch, a closing switch and an opening switch, wherein the common switch is connected to the closing switch via a first control switch, and the common switch is connected to the opening switch via a second control switch; The first control switch further includes a control end, the control end of the first control switch includes a first end and a second end, the first end of the control end of the first control switch is connected to the positive electrode connection port, and the second end of the control end of the first control switch is connected to the output control interface; The second control switch also includes a control end, the control end of the second control switch includes a first end and a second end, the first end of the control end of the second control switch is connected to the positive connection port, and the second end of the control end of the second control switch is connected to the output control interface.

6. The energy storage power supply system control circuit according to claim 5, characterized in that: The circuit breaker further comprises a common auxiliary contact, a normally open auxiliary contact and a normally closed auxiliary contact, wherein the common auxiliary contact is connected to an input feedback interface of the protection device, and the normally open auxiliary contact is connected to a negative connection port of the protection device.

7. The energy storage power system control circuit according to claim 5, characterized in that: The circuit breaker includes a motor, a first connection end and a second connection end, the first connection end is used to connect the negative pole of the low-voltage power supply, the second connection end is used to connect the positive pole of the low-voltage power supply, and the first connection end and the second connection end are connected to the motor to provide electrical energy to the motor; the start / close of the motor is controlled by the common switch, the closing switch and the opening switch.

8. The energy storage power supply system control circuit according to any one of claims 2 to 7, characterized in that: The circuit breaker further includes a shunt trip assembly, the shunt trip assembly including a shunt release, a first connection end and a second connection end, the first connection end is used to connect to the negative electrode of the low-voltage power supply through a third control switch, and the second connection end is used to connect to the positive electrode of the low-voltage power supply; The third control switch also includes a coil, and the coil of the third control switch includes a first end and a second end. The first end of the coil of the third control switch is connected to the negative connection port of the protection device, and the second end of the coil of the third control switch is connected to the output control interface of the protection device.

9. The energy storage power system control circuit according to any one of claims 1 to 7, characterized in that: The protection device is a battery management system.

10. A high voltage box for an energy storage power supply system, characterized in that: It comprises the energy storage power supply system control circuit as described in any one of claims 1 to 9.

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