Circuit for controlling output of UPS power supply through BMS
The circuit that controls the UPS power output through the BMS module solves the problem of UPS battery exhaustion, and realizes stable black startup of the energy storage system to avoid failure of off-grid power-off.
Patent Information
- Application Number
- CN202422035538.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-08-21
AI Technical Summary
The battery power of the UPS is exhausted before the black startup is successful, resulting in the energy storage power station failing to turn off the grid.
The BMS module outputs the enable signal when it is impossible to obtain external power, controls the first electrical control switch module to be disconnected, disconnects the connection between the UPS module and the BMS module, and re-establishes the connection by relying on the operation of the mechanical switch module to supply power to start the energy storage system.
It can achieve black startup when personnel are present, avoiding the battery drain within the UPS and ensuring the stable operation of the energy storage system.
Smart Images
Figure CN223261313U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of lithium batteries, and in particular relates to a circuit for controlling UPS power output through a BMS. Background Art
[0002] With the development of the energy storage industry, customers are increasingly demanding on-grid and off-grid energy storage power stations. During the transition from on-grid to off-grid, a backup power supply is required to power the control system, start the energy storage system, establish the AC bus voltage, and restore power to the load. Grid-to-off-grid refers to the process of switching an energy storage power station originally connected to the public grid to an independent operation mode that no longer relies on the grid. During this process, the energy storage power station relies on its own backup power supply to power the control system, ensuring that the energy storage system can be quickly started and the AC bus voltage can be established after disconnecting from the grid, thereby continuing to provide a stable power supply to the load. This operation ensures that in the event of a grid failure or when independent operation is required, the energy storage power station can seamlessly take over and maintain uninterrupted power supply to critical loads.
[0003] A typical black start solution for the energy storage industry is to add an uninterruptible power supply (UPS) to the control loop. After a grid power outage, the UPS activates the power conversion system (PCS) to restore power to the load. However, technical guidelines for electrochemical energy storage black starts generally require that the power of the energy storage unit used for self-starting should be no less than 1.2 times the power consumption of the energy storage station, and the capacity should be no less than the power supply requirement of the energy storage station for 15 minutes.
[0004] However, when the energy storage power station is unmanned, the arrival time of personnel is uncontrollable and may exceed 15 minutes. Or the on-site personnel may not be familiar with the on-site conditions, and the startup process may take too long, which may cause the internal battery of the UPS to be exhausted before the black start is successful, ultimately leading to off-grid startup failure. Utility Model Content
[0005] The utility model provides a circuit for controlling UPS power output through a BMS, which is used to solve the problem in the prior art that the internal battery of the UPS is exhausted before a black start is successful, resulting in off-grid startup failure.
[0006] In order to solve the above technical problems, in a first aspect, the present invention provides a circuit for controlling UPS power output through a BMS, comprising:
[0007] UPS module, used to input external power;
[0008] a mechanical switch module, wherein a first end of the mechanical switch module is connected to the UPS module;
[0009] a BMS module connected to the second end of the mechanical switch module, configured to obtain external power and output an enable signal when the external power cannot be obtained;
[0010] A first electrically controlled switch module is connected to the BMS module and includes a first normally closed contact. The first normally closed contact is connected between the BMS module and the mechanical switch module. The first electrically controlled switch module is used to receive an enable signal output by the BMS module and control the first normally closed contact to open when receiving the enable signal.
[0011] Optionally, the circuit for controlling the UPS power output through the BMS further includes:
[0012] A power supply module is connected between the first normally closed contact and the BMS module, and is used to supply power to the BMS module.
[0013] Optionally, the circuit for controlling the UPS power output through the BMS further includes:
[0014] The second electrically controlled switch module is connected to the power supply module and includes a first normally open contact for controlling the first normally open contact to close when power is turned on. The first normally open contact is connected between the UPS module and the first normally closed contact.
[0015] Optionally, the second electrically controlled switch module further includes a second normally open contact, and the second normally open contact is connected between the UPS module and the first normally closed contact.
[0016] Optionally, the second electronically controlled switch module is a relay, and the coil of the relay is connected to the power supply module.
[0017] Optionally, the first electrically controlled switch module is a contactor, and the coil of the contactor is connected to the BMS module.
[0018] Optionally, the circuit for controlling the UPS power output through the BMS further includes:
[0019] A switching conduction module is respectively connected to the UPS module, the first normally open contact and the first normally closed contact, and is used to receive the external power and control the UPS module to conduct with the first normally closed contact when the external power is received, and control the first normally open contact to conduct with the first normally closed contact when the external power cannot be received.
[0020] Optionally, the switching conduction module is a contactor, and the coil of the contactor is used to pass the external electrical energy, the second normally closed contact of the contactor is connected between the first normally open contact and the first normally closed contact, and the third normally open contact of the contactor is connected between the UPS module and the first normally closed contact.
[0021] Optionally, a bus capacitor is provided inside the power supply module, and the bus capacitor is used to store electrical energy.
[0022] Optionally, the circuit for controlling the UPS power output through the BMS further includes a load module connected between the power supply module and the first normally closed contact.
[0023] Compared with the prior art, the circuit provided by the present invention for controlling UPS power output through BMS has the following beneficial effects:
[0024] In the present invention, when the power grid loses power, the BMS module cannot obtain external electrical energy and will output an enable signal. The first electrically controlled switch module will control its first normally closed contact to disconnect when it receives the enable signal, and the first normally closed contact is connected between the BMS module and the mechanical switch module, which is in turn connected to the UPS module. Therefore, when the BMS module cannot obtain external electrical energy, the BMS module will be disconnected from the UPS module, so that the BMS module will lose power from the UPS module. After the BMS module loses power, the first electrically controlled switch module connected to the BMS module will lose power, causing the first normally closed contact to close. When the on-site personnel successfully operate the mechanical switch module to close, the UPS module can be reconnected to the BMS module, supplying power to the BMS module to start the energy storage system through the BMS module. In this way, the present invention achieves that the black start can only be completed when the personnel arrive on site and can quickly complete the black start through the mechanical switch module, avoiding the problem in the prior art that the internal battery of the UPS is exhausted before the black start is successful, resulting in off-grid startup failure. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present invention, rather than all of the embodiments. For ordinary technicians in this field, without paying creative work, other drawings obtained based on these drawings all fall within the scope of protection of the present invention.
[0026] Figure 1 This is a circuit structure diagram of controlling UPS power output through BMS provided by an embodiment of the utility model;
[0027] Figure 2This is another circuit structure diagram of controlling UPS power output through BMS provided by an embodiment of the utility model;
[0028] Figure 3 This is another circuit structure diagram of controlling UPS power output through BMS provided by an embodiment of the utility model;
[0029] Figure 4 This is another circuit structure diagram of controlling UPS power output through BMS provided by an embodiment of the utility model.
[0030] Explanation of drawing numbers: 100-UPS module, 200-mechanical switch module, 300-BMS module, 310-dry contact, 400-first electric control switch module, 410-first normally closed contact, 500-third switch, 600-power supply module, 700-second electric control switch module, 710-first normally open contact, 720-second normally open contact, 800-switching conduction module, 810-second normally closed contact, 820-third normally open contact, 900-load module. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0032] To make the description of this disclosure more detailed and complete, the following provides illustrative descriptions of the implementation methods and specific examples of this utility model; however, these are not the only ways to implement or use the specific examples of this utility model. All other examples derived by persons of ordinary skill in the art based on the examples of this utility model without inventive effort are also within the scope of protection of this utility model.
[0033] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.
[0034] In addition, in the description of the embodiments of the present invention, "multiple" refers to two or more than two, and other quantifiers should be understood similarly. The preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In addition, the embodiments of the present invention and the features therein can be combined with each other if there is no conflict.
[0035] like Figure 1 The figure shows a structural diagram of a circuit for controlling UPS power output through a BMS provided by an embodiment of the present invention, including: a UPS module 100, for inputting external power; a mechanical switch module 200, a first end of which is connected to the UPS module 100; a BMS module 300, connected to a second end of the mechanical switch module 200, for obtaining external power and outputting an enable signal when the external power cannot be obtained; a first electrically controlled switch module 400, connected to the BMS module 300, including a first normally closed contact 410, the first normally closed contact 410 being connected between the BMS module 300 and the mechanical switch module 200, the first electrically controlled switch module 400 being used to receive the enable signal output by the BMS module 300, and controlling the first normally closed contact 410 to be disconnected upon receiving the enable signal.
[0036] It should be noted that the external electric energy may be provided by any device or apparatus capable of providing electric energy, for example, the external electric energy may be provided by a power grid.
[0037] It should be noted that the mechanical switch module 200 is a switch module that requires the user to manually open or close, and may include, for example, a push button switch, a toggle switch, a rotary switch, or a press switch. As a specific example, the mechanical switch module 200 may be a press switch, which can connect the circuit when the user presses it and disconnect the circuit when the user releases it.
[0038] It should be noted that the way in which the battery management system (BMS) module obtains external electric energy can be any feasible way. For example, the external electric energy obtained by the BMS module 300 can be the electric energy in the power grid, and a detection element can be set in the power grid to detect whether there is electric energy in the power grid, and the detection element can be enabled to communicate remotely with the BMS module 300, so that the BMS module 300 can receive the electric energy signal of the detection element in the power grid, and output an enable signal when the detection element cannot detect the electric energy signal in the power grid, and do not output the enable signal when the detection element can detect the electric energy signal in the power grid. It should be noted that the enable signal output by the BMS module 300 can be any signal that can power on the first electric control switch module 400, and is not limited in detail here.
[0039] As a specific example, when the BMS module 300 is connected to the first electric-controlled switch module 400 , it can be connected to the first electric-controlled switch module 400 through the dry contact 310 of the BMS module 300 and send an enable signal to the first electric-controlled switch module 400 through the dry contact 310 .
[0040] It is understandable that when the BMS module 300 in the embodiment of the present invention determines the functions it needs to implement, the internal structure and principle of the BMS module 300 are clearly understood by those skilled in the art based on the existing technology and are not described in detail here.
[0041] It should be noted that the first electronically controlled switch module 400 may be any module that can receive the enable signal output by the BMS module 300 and control the first normally closed contact 410 to open when receiving the enable signal.
[0042] It should be noted that the first normally closed contact 410 is closed when the first electrically controlled switch module 400 is not powered on, and is open when the first electrically controlled switch module 400 is powered on.
[0043] Optionally, the UPS module 100 may be connected to a third switch 500, and the third switch 500 is used to access external power. When the third switch 500 is turned on, the UPS module 100 can access external power, and when the third switch 500 is turned off, the UPS module 100 cannot access external power.
[0044] In an embodiment of the present invention, when the grid loses power, the BMS module 300 is unable to obtain external power and outputs an enable signal. Upon receiving the enable signal, the first electrically controlled switch module 400 controls its first normally closed contact 410 to open. The first normally closed contact 410 is connected between the BMS module 300 and the mechanical switch module 200, which in turn is connected to the UPS module 100. Therefore, when the BMS module 300 is unable to obtain external power, it is disconnected from the UPS module 100, causing the BMS module 300 to lose power from the UPS module 100. After the BMS module 300 loses power, the first electrically controlled switch module 400 connected to the BMS module 300 also loses power, causing the first normally closed contact 410 to close. Once on-site personnel successfully close the mechanical switch module 200, the UPS module 100 can reconnect to the BMS module 300, providing power to the BMS module 300 and enabling the energy storage system to be activated through the BMS module 300. In this way, the embodiment of the utility model realizes that the black start can only be completed when the personnel arrive on site and can quickly complete the black start through the mechanical switch module 200, avoiding the problem in the prior art that the internal battery power of the UPS is exhausted before the black start is successful, resulting in off-grid startup failure.
[0045] In an optional implementation, Figure 1 As shown, the circuit for controlling the UPS power output through the BMS further includes: a power supply module 600 connected between the first normally closed contact 410 and the BMS module 300 , for supplying power to the BMS module 300 .
[0046] It should be noted that the power supply module 600 can be any module capable of supplying power, for example, the power supply module 600 can be a power supply. As a specific example, the power supply module 600 can be a 24V DC power supply.
[0047] It can be understood that by setting the power supply module 600 between the first normally closed contact 410 and the BMS module 300, when the UPS module 100 is disconnected from the control loop (i.e., the BMS module 300), an AC bus voltage can be established through the BMS module 300 and the power supply module 600 to supply power to the external load, thereby avoiding the negative impact caused by the sudden disconnection of the external load when the power grid loses power, thereby bringing a better user experience to the user.
[0048] In an optional implementation, Figure 1 As shown, the circuit for controlling the UPS power output through the BMS also includes: a second electrically controlled switch module 700, connected to the power supply module 600, including a first normally open contact 710, for controlling the first normally open contact 710 to close when power is turned on, and the first normally open contact 710 is connected between the UPS module 100 and the first normally closed contact 410.
[0049] It is understandable that in this implementation, when the power supply module 600 is supplying power, the second electrically controlled switch module 700 is energized, which can control the first normally open contact 710 to close, thereby connecting the UPS module 100 and the first normally closed contact 410. In this way, when personnel arrive on-site to operate the mechanical switch module 200 to conduct, the UPS module 100 and the power supply module 600 can be connected, and the second electrically controlled switch module 700 connected to the power supply module 600 can naturally be energized, causing the first normally open contact 710 to close. At this time, when the mechanical switch module 200 is disconnected, the UPS module 100 can be connected to the first normally closed contact 410 through the first normally open contact 710, that is, the UPS module 100 and the power supply module 600 can be connected. In this way, the next time the power grid loses power (i.e., the UPS module 100 cannot input external power), the UPS module 100 will still be disconnected from the power supply module 600 before personnel arrive at the scene. Only when personnel arrive at the scene and operate the mechanical switch module 200 to turn on can the UPS module 100 and the power supply module 600 be connected.
[0050] In an optional implementation, Figure 1 As shown, the second electrically controlled switch module 700 further includes a second normally open contact 720 , which is connected between the UPS module 100 and the first normally closed contact 410 .
[0051] It is understood that the provision of a second normally open contact 720 and the first normally open contact 710 between the UPS module 100 and the first normally closed contact 410 provides redundancy. If one path fails, the other path can continue to operate, thereby improving system reliability and stability. This is crucial for applications requiring high availability. The two-path design can be used to distribute current, with each branch carrying a portion of the total current. This prevents overloading of a single path and potentially optimizes thermal management and reduces energy consumption.
[0052] In an optional implementation, the second electronically controlled switch module 700 is a relay, and the coil of the relay is connected to the power supply module 600 .
[0053] It should be noted that relays are suitable for low-power, signal-level control applications. Due to their small size and high control sensitivity, relays are often used in precision control or remote control scenarios.
[0054] It is understandable that when on-site personnel operate the mechanical switch module 200, in order to avoid the startup time being too long and causing the power supply in the UPS module 100 to be exhausted, it is necessary to enable the second electric-controlled switch module 700 to quickly connect the UPS module 100 and the BMS module 300 after the on-site personnel disconnect the mechanical switch module 200. Naturally, when the second electric-controlled switch module 700 is selected as a relay, the relay can quickly connect the UPS module 100 and the BMS module 300 due to its high sensitivity.
[0055] In an optional implementation, the first electronically controlled switch module 400 is a contactor, and the coil of the contactor is connected to the BMS module 300 .
[0056] It's important to note that contactors are designed for direct control of high-current loads. Compared to relays, contactors have higher current capacity and more durable contacts, which can withstand the high current surge during equipment startup, ensuring safe and reliable operation.
[0057] It can be understood that the first normally closed contact 410 of the first electrically controlled switch module 400 is connected to the power supply module 600, and the power supply module 600 is a high current load. Therefore, in this implementation, designing the first electrically controlled switch module 400 as a contactor can ensure safe and reliable operation.
[0058] In an optional implementation, Figure 1As shown, the circuit for controlling the UPS power output through the BMS also includes: a switching conduction module 800, which is respectively connected to the UPS module 100, the first normally open contact 710 and the first normally closed contact 410, for receiving the external power and controlling the UPS module 100 to conduct with the first normally closed contact 410 when the external power is received, and controlling the first normally open contact 710 to conduct with the first normally closed contact 410 when the external power cannot be received.
[0059] It is understood that in this implementation, when the switching conduction module 800 receives external power (e.g., access to the power grid), it controls the UPS module 100 to conduct with the first normally closed contact 410, thereby enabling the power grid to supply power to the BMS module 300 and the control circuit through the UPS module 100. When a load is connected to the control circuit, the load can be powered by the power grid, and the power supply module 600 can also be powered by the power grid. When power from the power grid cannot be received, the first normally open contact 710 and the first normally closed contact 410 are connected. In this way, after the on-site personnel operate the mechanical switch module 200 to connect the UPS module 100 to the control circuit, the first normally open contact 710 will close, thereby conducting together with the first normally closed contact 410, so that the UPS module 100 can still supply power to the control circuit after the mechanical switch module 200 is disconnected.
[0060] In an optional implementation, Figure 1 As shown, the switching conduction module 800 is a contactor, and the coil of the contactor is used to pass external electrical energy. The second normally closed contact 810 of the contactor is connected between the first normally open contact 710 and the first normally closed contact 410, and the third normally open contact 820 of the contactor is connected between the UPS module 100 and the first normally closed contact 410.
[0061] It is understood that when external power is supplied to the contactor coil (e.g., the grid is powered), the contactor's third normally open contact 820 will close, causing conduction between the UPS module 100 and the first normally closed contact 410, while the contactor's second normally closed contact 810 will open, causing the first normally open contact 710 and the second normally closed contact 810 to be disconnected. When external power is not supplied to the contactor coil (e.g., the grid is powered off), the contactor's second normally closed contact 810 will close, causing the first normally open contact 710 and the second normally closed contact 810 to be closed, while the contactor's third normally open contact 820 will open, causing the UPS module 100 and the first normally closed contact 410 to be disconnected.
[0062] In an optional implementation, a bus capacitor is provided inside the power supply module 600, and the bus capacitor is used to store electrical energy.
[0063] It is understandable that when a bus capacitor is provided inside the power supply module 600, if the power grid loses power, the power supply module 600 can also temporarily maintain the power supply requirement of the second electronically controlled switch module 700 through the bus capacitor, so that the first normally open contact 710 of the second electronically controlled switch module 700 can be closed, so that the UPS module 100 can temporarily continue to supply power to the control circuit.
[0064] In an optional implementation, Figure 1 As shown, the circuit for controlling the UPS power output through the BMS further includes a load module 900 connected between the power supply module 600 and the first normally closed contact 410 .
[0065] It can be understood that in this implementation, by connecting the load module 900 between the power supply module 600 and the first normally closed contact 410, when external power is connected, the load module 900 can be powered by external power, and when no external power is connected, the load can be powered by the power supply module 600.
[0066] It should be noted that the load in this implementation can be set according to specific needs of the application. For example, the load can be an air conditioner or communication equipment.
[0067] As a specific example, Figure 2 As shown, when the grid is powered, the coil of the switching conduction module 800 is energized, causing the third normally open contact 820 to close, thereby connecting the UPS module 100 to the control circuit and energizing the control circuit. In this way, the coil of the second electrically controlled switch module 700 is energized through the power supply module 600 and energized, causing the first normally open contact 710 and the second normally open contact 720 of the second electrically controlled switch module 700 to close.
[0068] like Figure 3 As shown, when the grid loses power, the coil of the switching conduction module 800 is disconnected and the second normally closed contact 810 is reset. Since the power supply module 600 has a bus capacitor inside, the coil of the second electronically controlled switch can be temporarily kept connected. At this time, the UPS module 100 can supply power to the control circuit through the second normally open contact 720 and the third normally open contact 820.
[0069] like Figure 1As shown, after the power grid loses power, each load loses power. At this time, the BMS module 300 can determine that the power grid has lost power by obtaining the power grid electrical signal or the load electrical signal. At this time, the BMS module 300 can actively change the working state of each load to the shutdown state. After all loads are shut down, the BMS module 300 can send an enable signal to the first electric control switch module 400 through the dry contact 310 (the dry contact 310 is connected to the first electric control switch module 400), so that the coil of the first electric control switch module 400 is energized, thereby disconnecting the second normally closed contact 810 of the first electric control switch module 400, so that U The PS module 100 is disconnected from the control circuit. After the power supply module 600 is depleted, the coil of the second electrically controlled switch module 700 is released, resetting the first normally open contact 710 and the second normally open contact 720 of the second electrically controlled switch module 700. Furthermore, the BMS module 300 connected to the power supply module 600 loses power, resetting the dry contact 310. The coil of the first electrically controlled switch module 400 connected to the dry contact 310 loses power and resets, resetting the first normally closed contact 410 of the first electrically controlled switch module 400. If the power grid cannot be restored to a live state, the system enters a black start preparation state, awaiting a manual black start.
[0070] like Figure 4 As shown, after the operator arrives at the site, he disconnects the grid-side switch (the third switch 500) and then presses the mechanical switch module 200. In this way, the UPS module 100 is connected to the control circuit to supply power to the control circuit. After the power supply module 600 can start working, the coil of the second electric control switch module 700 is energized, so that the second normally open contact 720 and the first normally open contact 710 of the second electric control switch module 700 are closed, forming a self-locking state. In this way, power is supplied to the control circuit through the UPS module 100. At this time, the operator disconnects the mechanical switch module 200 to complete the black start.
[0071] It should be noted that if Figures 1-4 The L, N and PE shown in the figure are the live wire, neutral wire and ground wire in the power grid respectively, and the + and - of the power supply module 600 represent the positive and negative poles of the power supply module respectively.
[0072] The technical solution provided by the present invention is introduced in detail above. The principles and implementation methods of the present invention are explained by using specific examples in the present invention. The description of the above embodiments is only used to help understand the structure and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
[0073] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims
1. A circuit for controlling UPS power output through a BMS, characterized in that: include: UPS module, used to input external power; a mechanical switch module, wherein a first end of the mechanical switch module is connected to the UPS module; a BMS module connected to the second end of the mechanical switch module, configured to obtain external power and output an enable signal when the external power cannot be obtained; A first electrically controlled switch module is connected to the BMS module and includes a first normally closed contact. The first normally closed contact is connected between the BMS module and the mechanical switch module. The first electrically controlled switch module is used to receive an enable signal output by the BMS module and control the first normally closed contact to open when receiving the enable signal.
2. The circuit for controlling UPS power output through BMS according to claim 1, characterized in that: Also includes: A power supply module is connected between the first normally closed contact and the BMS module, and is used to supply power to the BMS module.
3. The circuit for controlling UPS power output through BMS according to claim 2, characterized in that: Also includes: The second electrically controlled switch module is connected to the power supply module and includes a first normally open contact for controlling the first normally open contact to close when power is turned on. The first normally open contact is connected between the UPS module and the first normally closed contact.
4. The circuit for controlling UPS power output through BMS according to claim 3, characterized in that: The second electrically controlled switch module further includes a second normally open contact, which is connected between the UPS module and the first normally closed contact.
5. The circuit for controlling UPS power output through BMS according to claim 3, characterized in that: The second electronically controlled switch module is a relay, and the coil of the relay is connected to the power supply module.
6. The circuit for controlling UPS power output through BMS according to claim 1, characterized in that: The first electric-controlled switch module is a contactor, and the coil of the contactor is connected to the BMS module.
7. The circuit for controlling UPS power output through BMS according to claim 3, characterized in that: Also includes: A switching conduction module is respectively connected to the UPS module, the first normally open contact and the first normally closed contact, and is used to receive the external power and control the UPS module to conduct with the first normally closed contact when the external power is received, and control the first normally open contact to conduct with the first normally closed contact when the external power cannot be received.
8. The circuit for controlling UPS power output through BMS according to claim 7, characterized in that: The switching conduction module is a contactor, and the coil of the contactor is used to pass the external electrical energy. The second normally closed contact of the contactor is connected between the first normally open contact and the first normally closed contact, and the third normally open contact of the contactor is connected between the UPS module and the first normally closed contact.
9. The circuit for controlling UPS power output through BMS according to claim 2, characterized in that: A bus capacitor is provided inside the power supply module, and the bus capacitor is used to store electrical energy.
10. The circuit for controlling UPS power output through BMS according to claim 2, characterized in that: It also includes a load module connected between the power supply module and the first normally closed contact.