Power control protection circuit system and method for outdoor water-cooled machine

Abstract

The application provides a power control protection circuit system and method of an outdoor water-cooled machine, which comprises a battery management system, an IO processor, a contactor, a power distribution box and a water-cooled unit; the battery management system is in communication connection with the IO processor and the water-cooled unit; the contactor comprises a coil and a contact contact point, the contact contact point is a normally open contact point and is closed when the coil is powered, two ends of the contact contact point are connected with the power distribution box and the water-cooled unit respectively, and the contact contact point is further connected with a feedback line to an input port of the IO processor, and the feedback line is used for feeding back the opening and closing state of the contact contact point to the IO processor; the positive and negative poles of the coil are connected with an output port of the IO processor and a power zero line respectively, the output port is a normally open interface and is connected with a power live line; and the power distribution box is connected with commercial power. The application can effectively solve the problem that the water-cooled machine power cannot be disconnected in time due to the contactor adhesion or other faults, and further cause the heat management of the energy storage system to be out of control.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage systems, in particular to a power control protection circuit system and method of an outdoor water-cooled machine. BACKGROUND

[0002] With the rapid development of energy storage battery technology, lithium batteries gradually become the mainstream product of energy storage because of their high energy, long service life, high power bearing capacity, low self-discharge rate, light weight, green environmental protection and other advantages. Since the capacity and service life of lithium ion batteries are greatly affected by temperature, more and more attention is paid to their thermal management. Water-cooled machines are increasingly widely used in the thermal management of energy storage systems because of their high efficiency, low energy consumption, support for long-time high-rate charge and discharge thermal management requirements, and small temperature difference between battery monomers.

[0003] The power circuit of the existing outdoor cabinet water-cooled machine only has contactor control of the unit itself. If contactor adhesion or other faults occur, the three-phase power supply cannot be disconnected in time, which easily causes the thermal management of the energy storage system to be out of control. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a power control protection circuit system and method of an outdoor water-cooled machine, which effectively solves the problem of water-cooled machine power supply not being disconnected in time due to contactor adhesion or other faults, thereby causing the thermal management of the energy storage system to be out of control.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] A power control protection circuit system of an outdoor water-cooled machine, comprising a battery management system, an IO processor, a contactor, a power distribution box and a water-cooled unit.

[0007] The battery management system is in communication connection with the IO processor and the water-cooled unit.

[0008] The contactor comprises a coil and a contact point, the contact point is a normally open contact point and is closed when the coil is powered, the two ends of the contact point are connected with the power distribution box and the water-cooled unit respectively, and the contact point is further connected with a feedback line to an input port of the IO processor, the feedback line is used to feed back the opening and closing state of the contact point to the IO processor.

[0009] The positive and negative poles of the coil are connected with an output port of the IO processor and a power zero line respectively, the output port is a normally open interface and is connected with a power live line.

[0010] The power distribution box is connected with a commercial power supply.

[0011] To solve the above technical problems, the application provides another technical scheme:

[0012] A power control protection method of an outdoor water-cooled machine, applied to the power control protection loop system of the outdoor water-cooled machine, comprising the following steps:

[0013] S1, when the water-cooled unit needs to start working, the battery management system writes high level to a normally open output port of the IO processor through a communication line, the normally open contact point of the output port is closed to make the power fire line connected with the output port and the power zero line connected with the negative pole of the coil of the contactor conductive, and the coil is powered on;

[0014] S2, the contact points of the contactor are attracted, the power distribution box transmits the commercial power to the water-cooled unit through the attracted contact points, the water-cooled unit is powered on and starts working, and the feedback line transmits the attraction signal of the contact points to an input port of the IO processor;

[0015] S3, the battery management system detects the state of the water-cooled unit and the level of the input port through the communication line, if the fault state of the water-cooled unit is not received and the level of the input port is low, it represents that the contactor is normal;

[0016] When the fault state of the water-cooled unit is received, the battery management system writes low level to the output port through the communication line, and reads the level of the input port, if the level of the input port is suspended, it represents that the contact points have been disconnected, and the water-cooled unit has been powered off;

[0017] If the level of the input port is still low, it represents that the contact points have not been disconnected, the battery management system reports the fault of the contactor, and the total switch of the power distribution box is tripped.

[0018] The application has the beneficial effects that the application provides a power control protection loop system and method of an outdoor water-cooled machine, the battery management system writes high and low level states to a normally open output port of the IO processor to control the power on and power off of the coil of the contactor, so as to further control the attraction and disconnection of the contact points in the contactor to realize the control of the power supply of the water-cooled unit, the contactor is further provided with a feedback line connected with an input port of the IO processor, the IO processor feeds back the open and closed states of the contactor to the battery management system through the input signal of the feedback line, and the state of the water-cooled unit received by the battery management system in real time through the communication line can timely trip the total switch of the power distribution box when the contact points of the contactor cannot be disconnected due to the adhesion of the contactor or other faults and the like under the fault of the water-cooled unit, so as to cut off the connection between the water-cooled unit and the commercial power, and effectively realize the protection of the power supply of the water-cooled unit. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A whole structure block diagram of a power control protection circuit system of an outdoor water-cooled machine according to an embodiment of the present application;

[0020] Figure 2 A connection diagram of a power control protection circuit system of an outdoor water-cooled machine according to an embodiment of the present application;

[0021] Figure 3 A whole flow chart of a power control protection method of an outdoor water-cooled machine according to an embodiment of the present application;

[0022] Figure 4 A specific flow chart of a power control protection method of an outdoor water-cooled machine according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] To make the technical contents, the achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0024] Please refer to Figure 1 and Figure 2 A power control protection circuit system of an outdoor water-cooled machine, comprising a battery management system, an IO processor, a contactor, a power distribution box and a water-cooled machine set;

[0025] The battery management system is in communication connection with the IO processor and the water-cooled machine set;

[0026] The contactor comprises a coil and a contact contact point, the contact contact point is a normally open contact point and is closed when the coil is powered, two ends of the contact contact point are respectively connected with the power distribution box and the water-cooled machine set, and the contact contact point is further connected with a feedback line to an input port of the IO processor, the feedback line is used for feeding back the opening and closing state of the contact contact point to the IO processor;

[0027] The positive and negative poles of the coil are respectively connected with an output port of the IO processor and a power zero line, the output port is a normally open interface and is connected with a power live line;

[0028] The power distribution box is connected with a commercial power supply.

[0029] From the above description, the beneficial effects of the present application are that the battery management system writes high and low level state to the normally open output port of the IO processor to control the power-on and power-off of the coil of the contactor, thereby further controlling the attraction and disconnection of the contact points in the contactor to achieve control over the power supply of the water-cooled unit. At the same time, the contactor is also provided with a feedback line connected to an input port of the IO processor. The IO processor feeds back the opening and closing state of the contactor to the battery management system through the input signal of the feedback line, and cooperates with the battery management system to receive the state of the water-cooled unit in real time through the communication line. In the event of a fault in the water-cooled unit, the contactor is stuck or other faults occur, and the battery management system writes low level to the output port to disconnect the contact points of the contactor, the main switch of the distribution box is disconnected in time, thereby disconnecting the connection between the water-cooled unit and the mains, and effectively protecting the power supply of the water-cooled unit.

[0030] Further, the output port includes a first pin and a second pin;

[0031] The first pin and the second pin are respectively connected to two ends of a normally open contact point of a relay inside the IO processor, and the first pin is connected to the live wire of the 220V power supply through a cable, and the second pin is connected to the positive electrode of the coil through a cable;

[0032] The negative electrode of the coil is connected to the zero line of the 220V power supply.

[0033] From the above description, the first pin and the second pin of an output port on the IO processor are the two ends of a normally open contact point, so that the conduction between the first pin and the second pin can be controlled by writing high level, thereby forming a conduction loop between the coil of the contactor and the zero and live wires of the household voltage 220V, controlling the power-on of the coil, and further controlling the attraction of the contact points.

[0034] Further, the contact points include main contact points and auxiliary contact points;

[0035] The two ends of the main contact points are respectively connected to the distribution box and the water-cooled unit;

[0036] One end of the auxiliary contact points is grounded, and the other end is connected to the input port through the feedback circuit, and the opening and closing state of the auxiliary contact points is synchronized with the opening and closing state of the main contact points.

[0037] From the above description, the contact points are divided into main contact points and auxiliary contact points. The main contact points are only responsible for delivering the mains to the water-cooled unit for operation, and the auxiliary contact points are only responsible for feeding back the state of the attracted or disconnected contact points to the IO processor through the feedback circuit. The division of labor is clear, and they do not interfere with each other, thereby improving the control stability and efficiency of the entire loop system.

[0038] Further, the power distribution box is connected with the commercial power through a three-phase circuit breaker switch.

[0039] The main contact is three, and two ends of the three main contacts are connected with three-phase output of the three-phase circuit breaker switch and three-phase input of the water-cooled unit respectively.

[0040] From the above description, it can be seen that the three-phase power supply is used to supply power to the water-cooled unit, which has the characteristics of large power, stable transmission, energy saving and safety.

[0041] Further, the IO processor further comprises a power interface AVCC and a ground interface AGND.

[0042] The power interface AVCC is connected with a 24V+ power supply, and the ground interface AGND is grounded.

[0043] From the above description, it can be seen that the IO processor is powered by a 24V power supply, that is, an independent power supply module is used to ensure long-term communication with the battery management system.

[0044] Further, the battery management system comprises an upper computer and an industrial computer.

[0045] The upper computer and the industrial computer are connected through a cable.

[0046] From the above description, it can be seen that the battery management system integrates the industrial computer and the upper computer, and the upper computer can be used to issue instructions, that is, the state of each input and output pin on the IO processor is written, and the industrial computer is responsible for collecting and transmitting each signal.

[0047] Further, the industrial computer comprises at least two 485 communication interfaces, and the IO processor and the water-cooled unit each comprise at least one 485 communication interface.

[0048] The 485 communication interfaces of the IO processor and the contactor are connected with the 485 communication interface of the industrial computer through a 485 bus.

[0049] From the above description, it can be seen that the industrial computer, the IO processor and the contactor all use 485 communication mode, which has the characteristics of fast transmission rate, long distance and strong anti-interference.

[0050] Further, the industrial computer further comprises a network interface, a USB interface, an HDMI interface, a CAN interface and a power interface.

[0051] From the above description, it can be seen that the industrial computer further comprises other types of interfaces, which has high integration and powerful functions.

[0052] Please refer to Figure 3 and Figure 4A power control protection method of an outdoor water-cooled machine, applied to a power control protection circuit system of the outdoor water-cooled machine, comprising the following steps:

[0053] S1, when the water-cooled unit needs to start working, the battery management system writes high level to a normally open output port of the IO processor through the communication line, the normally open contact point of the output port is closed to make the power fire line connected with the output port and the power zero line connected with the negative pole of the coil of the contactor conductive, and the coil is powered on;

[0054] S2, the contact contact point of the contactor is attracted, the power distribution box transmits the commercial power to the water-cooled unit through the attracted contact contact point, the water-cooled unit is powered on and starts working, and the feedback line transmits the attraction signal of the contact contact point to an input port of the IO processor;

[0055] S3, the battery management system detects the state of the water-cooled unit and the level of the input port through the communication line, if the fault state of the water-cooled unit is not received and the level of the input port is low, it represents that the contactor is normal;

[0056] When the fault state of the water-cooled unit is received, the battery management system writes low level to the output port through the communication line, and reads the level of the input port, if the level of the input port is suspended, it represents that the contact contact point has been disconnected, and the water-cooled unit has been powered off;

[0057] If the level of the input port is still low, it represents that the contact contact point has not been disconnected, the battery management system reports the contactor fault, and the main switch of the power distribution box is tripped.

[0058] From the above description, the beneficial effects of the present application are that based on the same technical concept, the power control protection circuit system of the outdoor water-cooled machine is adopted to provide the power control protection method of the outdoor water-cooled machine, the high and low level state of the normally open output port of the IO processor is written by the battery management system to control the power on and power off of the coil of the contactor, so as to further control the attraction and disconnection of the contact contact point in the contactor to realize the control of the power supply of the water-cooled unit, and the contactor is also provided with a feedback line connected with an input port of the IO processor, the opening and closing state of the contactor is fed back to the battery management system by the input signal of the feedback line, and the state of the water-cooled unit is received in real time by the battery management system through the communication line, so that when the contact contact point of the contactor cannot be disconnected due to the adhesion of the contactor or other faults under the fault of the water-cooled unit, the main switch of the power distribution box is disconnected in time, so as to cut off the connection between the water-cooled unit and the commercial power, and the protection of the power supply of the water-cooled unit is realized effectively.

[0059] The present invention discloses a power control and protection circuit system and method for an outdoor water chiller, which is used for the control and protection of the power supply of the water chiller unit in an energy storage system. The following description is based on specific embodiments.

[0060] Please refer to Figure 1 Embodiment 1 of the present invention is as follows:

[0061] A power control and protection circuit system for an outdoor water chiller, such as Figure 1 As shown, it includes a battery management system (EMS), an I / O processor, contactors, a power distribution box, and a water-cooled unit.

[0062] In this embodiment, the battery management system (EMS) is communicatively connected to the IO processor and the water-cooled unit. The contactor includes a coil and contact points. The contact points are normally open and close when the coil is energized. The two ends of the contact points are connected to the power distribution box and the water-cooled unit, respectively. The contact points are also connected to a feedback line to an input port of the IO processor. The feedback line is used to provide feedback on the opening and closing status of the contact points to the IO processor. At the same time, the positive and negative poles of the coil are connected to an output port of the IO processor and the neutral wire of the power supply, respectively. The output port is a normally open interface and is connected to the live wire of the power supply. In addition, the power distribution box is also connected to the mains power.

[0063] In this embodiment, the battery management system (EMS) writes high and low level states to a normally open output port of the IO processor to control the energization and de-energization of the contactor coil, thereby further controlling the opening and closing of the contact points inside the contactor to control the power supply of the water-cooled unit. At the same time, the contactor is also equipped with a feedback line connected to an input port of the IO processor. The IO processor feeds back the open and closed state of the contactor to the battery management system (EMS) through the input signal of the feedback line. In conjunction with the real-time status of the water-cooled unit received by the battery management system (EMS) through the communication line, when the contactor is stuck or other faults prevent the battery management system (EMS) from writing a low level to the output port to disconnect the contact points, the main switch of the distribution box can be disconnected in time, thereby cutting off the connection between the water-cooled unit and the mains power, effectively protecting the power supply of the water-cooled unit.

[0064] Please refer to Figure 2 Embodiment two of the present invention is as follows:

[0065] A power control and protection circuit system for an outdoor water chiller, based on the above embodiment one, as follows: Figure 2 As shown, the IO processor includes multiple input ports DI1 to DI8 and multiple output ports RY1A to RY4B.

[0066] In the embodiment, the selected output port includes a first pin RY1A and a second pin RY1B, the first pin RY1A and the second pin RY1B are respectively connected to two ends of a normally open contact of an internal relay of the IO processor, and the first pin RY1A is connected to a live wire of a 220V power supply through a cable, and the second pin is connected to a positive electrode of a coil in the contactor through a cable, and a negative electrode of the coil is connected to a zero line of the 220V power supply.

[0067] In the embodiment, the IO processor can be written with a high level 1 by the power management system EMS to make the first pin RY1A and the second pin RY1B conduct, so that the positive electrode of the coil in the contactor is connected to the live wire of the household voltage 220V power supply, and the negative electrode of the coil is connected to the zero line of the 220V power supply at this time, that is, the coil and the zero line of the 220V power supply form a conduction loop, the coil is powered on, and then the contact point is controlled to be attracted, and through the attraction of the contact point, the power distribution box delivers the commercial power to the water-cooled unit through the attracted contact point, and supplies power for the work of the water-cooled unit, and ensures the normal operation of the thermal management of the energy storage system.

[0068] In the embodiment, as shown in Figure 2 , the contact point includes three main contact points and an auxiliary contact point, and the power distribution box is provided with a three-phase circuit breaker switch, and the power distribution box is connected to the commercial power through the three-phase circuit breaker switch, and two ends L1, L2, L3 and T1, T2, T3 of the three main contact points are respectively connected to three-phase outputs of the three-phase circuit breaker switch in the power distribution box and three-phase inputs of the water-cooled unit, that is, the three-phase power supply is used to supply power to the water-cooled unit, which has the characteristics of large power, stable transmission, saving of electric energy and safety.

[0069] At the same time, as shown in Figure 2 , one end of the auxiliary contact point is connected to the ground of the 24V power supply, and the other end is connected to an input port DI1 of the IO processor through a feedback circuit, and the opening and closing state of the auxiliary contact point is synchronized with the opening and closing state of the main contact point, so that when the main contact point is attracted, the auxiliary contact point is also attracted synchronously, so that the attraction state of the auxiliary contact point fed back by the feedback circuit is the attraction state of the main contact point. In the embodiment, the contact point is divided into the main contact point and the auxiliary contact point, the main contact point is only responsible for delivering the commercial power to the water-cooled unit for the work of the water-cooled unit, and the auxiliary contact point is only responsible for feeding back the attraction or disconnection state to the IO processor through the feedback circuit, so that the division of labor is clear, and the control stability and efficiency of the whole loop system are improved.

[0070] At the same time, in the embodiment, as shown in Figure 2As shown, the I / O processor also includes a power interface AVCC and a ground interface AGND. The power interface AVCC is connected to a 24V+ power supply, and the ground interface AGND is grounded. This means the I / O processor is powered by a 24V power supply and uses an independent power supply module to ensure long-term communication with the battery management system.

[0071] In this embodiment, such as Figure 2 As shown, the battery management system includes a host computer and an industrial control computer, with the host computer connected to the industrial control computer via a cable. That is, the battery management system integrates the industrial control computer and the host computer; the host computer can write high and low levels to the input / output pins on the I / O processor, while the industrial control computer is responsible for the acquisition and transmission of signals. For example... Figure 2 As shown, the industrial control computer includes two 485 communication interfaces, and the IO processor and water-cooled unit each include at least one 485 communication interface. The 485 communication interfaces of the IO processor and contactor are connected to the industrial control computer's 485 communication interface via a 485 bus. This means the industrial control computer communicates with the IO processor and contactor using 485 communication, which offers high transmission speed, long distance, and strong anti-interference capabilities. In other equivalent embodiments, the number of 485 communication interfaces for each device is not limited to the above number; it is sufficient to ensure that the industrial control computer includes at least two 485 communication interfaces, and the IO processor and water-cooled unit include at least one 485 communication interface. Furthermore, the host computer can add relevant control strategies. Upon receiving the operating mode or fault status of the water-cooled unit collected by the industrial control computer via the 485 bus, the host computer can execute corresponding control strategies to further achieve timely power control and protection for the water-cooled unit in case of faults.

[0072] Additionally, in this embodiment, as Figure 3 As shown, the industrial control computer also includes RJ45-1 and RJ45-2 network cable interfaces, multiple USB interfaces, an HDMI interface, multiple CAN interfaces, and a power interface. The USB interfaces can connect devices such as keyboards and mice. In other words, the industrial control computer integrates other functional interfaces, which can greatly improve the performance of the overall circuit system. In other equivalent embodiments, the specific interface expansion and usage can be selected according to actual needs.

[0073] Please refer to Figure 4 and Figure 3 Embodiment 3 of the present invention is as follows:

[0074] A power control and protection method for an outdoor water chiller, applied to the power control and protection circuit system of an outdoor water chiller in the above embodiment two, such as... Figure 4 As shown, the steps include:

[0075] S1, when the water-cooled unit needs to start working, the battery management system writes high level to the normally open output port of the IO processor through the communication line, the normally open contact point of the output port is closed to make the power fire line connected with the output port and the power zero line connected with the negative pole of the coil of the contactor conductive, the coil is powered on, in the embodiment, writing high level is writing 1, and writing low level is writing 0;

[0076] S2, the contact points of the contactor are attracted, the power distribution box delivers the commercial power to the water-cooled unit through the attracted contact points, the water-cooled unit is powered on and starts working, and the feedback line transmits the attraction signal of the contact points to an input port of the IO processor;

[0077] S3, the battery management system detects the state of the water-cooled unit and the level of the input port through the communication line, if the fault state of the water-cooled unit is not received and the level of the input port is low, it represents that the contactor is normal;

[0078] When the fault state of the water-cooled unit is received, the battery management system writes low level to the output port through the communication line, and reads the level of the input port, if the level of the input port is suspended, it represents that the contact points are disconnected and the water-cooled unit is powered off;

[0079] If the level of the input port is still low, the output port can be written low level repeatedly for many times, if the level of the input port is still low after writing low level for many times, it represents that the contact points are stuck and not disconnected, the battery management system reports the contactor fault, and the main switch of the power distribution box is tripped.

[0080] That is, in the embodiment, based on the same technical concept, a power control protection method of the outdoor water-cooled unit is provided by cooperating with the power control protection circuit system of the outdoor water-cooled unit, the battery management system writes high and low level states to the normally open output port of the IO processor to control the power on and power off of the coil of the contactor, so as to further control the attraction and disconnection of the contact points in the contactor to realize the control of the power supply of the water-cooled unit, meanwhile, the contactor is also provided with a feedback line connected with an input port of the IO processor, the IO processor feeds back the opening and closing state of the contactor to the battery management system through the input signal of the feedback line, and the state of the water-cooled unit received by the battery management system through the communication line in real time can timely trip the main switch of the power distribution box when the contact points of the contactor are stuck or other faults occur to cause the battery management system to write low level to the output port and the contact points of the contactor cannot be disconnected, so as to cut off the connection between the water-cooled unit and the commercial power, and effectively realize the protection of the power supply of the water-cooled unit.

[0081] In addition, in the embodiment, as ​As shown, when the battery management system patrols and finds that the water cooling unit is in a normal working state, but the battery management system can receive the current running state of the water cooling unit to formulate a corresponding working mode, and then controls the water cooling unit to execute the corresponding working mode through writing an IO processor or directly writing the water cooling unit, so as to improve the running performance of the water cooling unit.

[0082] In summary, the power control protection circuit system and method of the outdoor water cooling machine provided by the application further controls the working of the water cooling unit by writing the high and low level of the output port of the battery management system into the coil of the contactor to control the power-on and power-off of the coil, thereby realizing the on-off control of the power supply of the water cooling unit, and at the same time, the opening and closing state of the contactor contact is obtained through the IO processor and is fed back to the battery management system through a feedback line, and the battery management system judges whether the contactor is stuck or has other faults according to the state of the contactor contact and the running state of the water cooling unit collected, thereby effectively solving the problem that the water cooling machine power supply cannot be turned off in time due to the sticking or other faults of the contactor, and further causing the heat management of the energy storage system to be out of control, and ensuring the safety of the heat management of the energy storage system.

[0083] The above description is only an embodiment of the application, and does not limit the patent range of the application, and any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings of the application is also included in the patent protection range of the application.

Claims

1. A power control and protection circuit system for an outdoor water-cooled machine, characterized in that, The battery management system, the IO processor, the contactor, the power distribution box and the water-cooled unit are included; The battery management system is in communication connection with the IO processor and the water-cooled unit; The contactor includes a coil and a contact contact point, the contact contact point is a normally open contact point and is closed when the coil is powered, two ends of the contact contact point are connected with the power distribution box and the water-cooled unit respectively, and the contact contact point is further connected with a feedback line to an input port of the IO processor, the feedback line is used for feeding back the opening and closing state of the contact contact point to the IO processor; The positive and negative poles of the coil are connected with an output port of the IO processor and a power zero line respectively, the output port is a normally open interface and is connected with a power live line; The power distribution box is connected with the commercial power supply; The output port includes a first pin and a second pin; The first pin and the second pin are respectively connected with two ends of a normally open contact point of an internal relay of the IO processor, the first pin is connected with a 220V power live line through a cable, and the second pin is connected with the positive pole of the coil through a cable; The negative pole of the coil is connected with a 220V power zero line; The control protection method of the power supply control protection loop system of the outdoor water-cooled unit includes the following steps: S1, when the water-cooled unit needs to start working, the battery management system writes high level to a normally open output port of the IO processor through a communication line, the normally open contact point of the output port is closed to make the power live line connected with the output port and the power zero line connected with the negative pole of the coil of the contactor conductive, and the coil is powered on; S2, the contact contact point of the contactor is attracted, the power distribution box sends the commercial power supply to the water-cooled unit through the attracted contact contact point, the water-cooled unit is powered on and starts working, and the feedback line transmits the attraction signal of the contact contact point to an input port of the IO processor; S3, the battery management system detects the state of the water-cooled unit and the level of the input port through the communication line, if the fault state of the water-cooled unit is not received and the level of the input port is low, it represents that the contactor is normal; When the fault state of the water-cooled unit is received, the battery management system writes low level to the output port through the communication line, and reads the level of the input port, if the level of the input port is in a suspended state, it represents that the contact contact point has been disconnected, and the water-cooled unit has been powered off; If the level of the input port is still low, it represents that the contact contact point has not been disconnected, the battery management system reports the contactor fault, and the main switch of the power distribution box is tripped. The contact contact point includes a main contact point and an auxiliary contact point; 2. The power control protection circuit system of an outdoor water-cooled machine according to claim 1, characterized in that, Two ends of the main contact point are connected with the power distribution box and the water-cooled unit respectively; One end of the auxiliary contact point is grounded, the other end is connected with the input port through the feedback line, and the opening and closing state of the auxiliary contact point is synchronous with the opening and closing state of the main contact point. The power distribution box is connected with the commercial power supply through a three-phase circuit breaker switch; 3. The outdoor water-cooled machine power control protection circuit system of claim 2, wherein, ​ The main contact is three, and two ends of the three main contacts are respectively connected with three-phase output of the three-phase circuit breaker switch and three-phase input of the water-cooled unit.

4. The power control protection circuit system of an outdoor water-cooled machine according to claim 1, wherein, The IO processor further comprises a power supply interface AVCC and a ground interface AGND; The power supply interface AVCC is connected with a 24V+ power supply, and the ground interface AGND is grounded.

5. The power control protection circuit system of an outdoor water-cooled machine according to claim 1, wherein, The battery management system comprises an upper computer and an industrial computer. The upper computer is connected with the industrial computer through a cable.

6. The power control protection circuit system of an outdoor water-cooled machine according to claim 5, wherein, The industrial computer comprises at least two 485 communication interfaces, and the IO processor and the water-cooled unit each comprise at least one 485 communication interface. The 485 communication interfaces of the IO processor and the contactor are connected with the 485 communication interfaces of the industrial computer through a 485 bus.

7. The outdoor water-cooled machine power control protection circuit system of claim 5, wherein, The industrial computer further comprises a network interface, a USB interface, an HDMI interface, a CAN interface and a power supply interface.

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