Uninterruptible power supply based on lithium battery and uninterruptible power supply
By setting up the lithium battery power supply module independently and having it managed separately by the lithium battery management system for charging and discharging, the problem of complex information interaction between the lithium battery management system and the UPS control module is solved. This simplifies the software architecture, improves system stability, and facilitates maintenance and expansion of application scenarios.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YONG LIAN KE JI (CHANG SHU) YOU XIAN GONG SI
- Filing Date
- 2025-03-11
- Publication Date
- 2026-04-21
AI Technical Summary
In existing lithium battery-based uninterruptible power supply systems, the information interaction between the lithium battery management system and the UPS control module is complex, resulting in a complex software architecture and poor system stability.
The lithium battery power supply module is set up independently, and the charging and discharging process is managed separately by the lithium battery management system. The lithium battery management system and the UPS control module process data separately, forming an independent unit and reducing data exchange.
It simplifies the software architecture, improves system stability, facilitates maintenance, and expands the application scenarios of lithium batteries in the field of uninterruptible power supplies.
Smart Images
Figure CN224154013U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of uninterruptible power supply technology, and more particularly to an uninterruptible power supply based on a lithium battery and the uninterruptible power supply. Background Technology
[0002] A UPS (Uninterruptible Power Supply) is a device used to provide power backup. When the main power supply fails or is interrupted, the UPS can automatically switch to the backup power supply, ensuring that the equipment continues to operate and preventing data loss or hardware damage.
[0003] With the increasing maturity of lithium-ion battery technology, lithium batteries are widely used in the field of uninterruptible power supplies (UPS). Because lithium batteries require control functions such as battery information collection and charge / discharge management, they are typically managed by a lithium battery management system (LBMS). However, existing lithium battery-based UPS systems usually deliver the information collected by the LBMS to the UPS control module for control. This approach requires the UPS control module to process a large amount of information, resulting in a complex software architecture and poor overall system stability. Utility Model Content
[0004] To address the aforementioned technical problems, this application provides an uninterruptible power supply based on a lithium battery and an uninterruptible power supply.
[0005] In a first aspect, embodiments of this application disclose an uninterruptible power supply based on a lithium battery, including a first power supply module, a UPS control module, and a lithium battery power supply module;
[0006] The two ends of the UPS control module are connected to the first power supply module and the load, respectively;
[0007] The lithium battery power supply module includes a lithium battery pack, a lithium battery management system, a charging module, and a discharging module. The first end of the charging module is connected to the first power supply module, and the second end is connected to the lithium battery pack. The first end of the discharging module is connected to the UPS control module, and the second end is connected to the lithium battery pack. The lithium battery management system is connected to the charging module and is used to control the charging module to charge the lithium battery pack from the first power supply module. The lithium battery management system is also connected to the discharging module and is used to control the discharging module to discharge the lithium battery pack to the UPS control module.
[0008] In some possible embodiments, the UPS control module includes a DC bus, a first static switch, and a second static switch;
[0009] The first static switch and the DC bus are connected in series; the first end of the DC bus is connected to the first power supply module, and the second end is connected to the first end of the first static switch; the second end of the first static switch is connected to the load.
[0010] The second static switch is connected in parallel with the DC bus and the first static switch, and the two ends of the second static switch are connected to the first power supply module and the load, respectively.
[0011] The lithium battery pack is connected to the DC bus via a discharge module to supply power to the DC bus.
[0012] In some possible embodiments, the UPS control module also includes a rectifier and an inverter;
[0013] The rectifier is located between the first power supply module and the first end of the DC bus, and the inverter is located between the second end of the DC bus and the first static switch.
[0014] In some possible embodiments, the discharge module includes a unidirectional DC / DC conversion module for detecting the voltage state of the DC bus and stopping power supply to the DC bus based on the voltage state of the DC bus.
[0015] In some possible embodiments, the charging module includes a unidirectional AC / DC conversion module for converting the AC power output from the first power supply module into DC power to charge the lithium battery pack, based on the control of the lithium battery management system.
[0016] In some possible embodiments, the first power supply module includes a mains power supply and a step-down transformer;
[0017] The step-down transformer is placed between the mains power supply and the UPS control module.
[0018] In some possible embodiments, the first power supply module further includes a first switch; the first switch is disposed between the step-down transformer and the UPS control module.
[0019] In some possible embodiments, the UPS control module also includes a maintenance switch; the maintenance switch is configured in parallel with the second static switch, the DC bus, and the first static switch.
[0020] Secondly, embodiments of this application disclose an uninterruptible power supply, including a second power supply module and any of the above-mentioned lithium battery-based uninterruptible power supplies;
[0021] The second power supply module includes a lead-acid battery; the lead-acid battery is connected to the UPS control module and is used to supply power to the UPS control module.
[0022] In some possible embodiments, the second power supply module further includes a second switch disposed between the lead-acid battery and the UPS control module.
[0023] The technical solution provided in this application has the following technical effects:
[0024] The lithium battery-based uninterruptible power supply according to this application embodiment includes a first power supply module, a UPS control module, and a lithium battery power supply module. The two ends of the UPS control module are respectively connected to the first power supply module and a load. The lithium battery power supply module includes a lithium battery pack, a lithium battery management system, a charging module, and a discharging module. The first end of the charging module is connected to the first power supply module, and the second end is connected to the lithium battery pack. The first end of the discharging module is connected to the UPS control module, and the second end is connected to the lithium battery pack. The lithium battery management system is connected to the charging module and is used to control the charging module to charge the lithium battery from the first power supply module. The lithium battery management system is also connected to the discharging module and is used to control the discharging module to discharge the lithium battery pack to the UPS control module. In this embodiment, by setting up a separate lithium battery power supply module and having the lithium battery management system manage the charging and discharging of the lithium battery pack independently, the lithium battery power supply module becomes an independent unit, not managed by the UPS control module. The UPS control module and the lithium battery management system process relevant data information independently without exchanging data with each other. The overall software architecture is simple, highly stable, and easy to maintain. As an independent unit, the lithium battery module can be directly connected to existing uninterruptible power supplies without changing the existing UPS control logic, reducing workload and expanding the application scenarios of lithium batteries in the field of uninterruptible power supplies. Attached Figure Description
[0025] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of a lithium battery-based uninterruptible power supply provided in an embodiment of this application. Figure 1 ;
[0027] Figure 2 This is a schematic diagram of a lithium battery-based uninterruptible power supply provided in an embodiment of this application. Figure 2 ;
[0028] Figure 3 This is a schematic diagram of an uninterruptible power supply provided in an embodiment of this application.
[0029] Figure label:
[0030] 1. First power supply module; 11. Mains power supply; 12. Step-down transformer; 13. First switch; 14. Maintenance switch;
[0031] 2. UPS control module; 21. DC bus; 22. First static switch; 23. Second static switch; 24. Rectifier; 25. Inverter;
[0032] 3. Lithium battery power supply module; 31. Lithium battery pack; 32. Lithium battery management system; 33. Charging module; 34. Discharging module;
[0033] 4. Second power supply module; 41. Lead-acid battery; 42. Second switch. Detailed Implementation
[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0035] It should be noted that the term "an embodiment" or "embodiment" in the specification of the embodiments of this application refers to a specific feature, structure, or characteristic that can be included in at least one implementation of this application. It should be understood that in the specification, claims, and accompanying drawings of the embodiments of this application, the terms "upper," "lower," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, in the description of this embodiment, unless otherwise stated, "a plurality of" means two or more. Additionally, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, or product that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.
[0036] It should be understood that when a device or component is referred to as being "on," "adjacent to," or "connected to" other devices or components, it may be directly on, adjacent to, or connected to other devices or components, or there may be intervening devices or components. Conversely, when a device or component is referred to as being "directly on," "directly adjacent to," or "directly connected to" other devices or components, there are no intervening devices or components. It should be understood that although the terms first, second, third, etc., may be used to describe various components, areas, layers, and / or parts, these components, areas, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one component, area, layer, or part from another component, area, layer, or part. Therefore, without departing from the teachings of this application, the first component, area, layer, or part discussed below may be referred to as the second component, area, layer, or part. And the discussion of the second component, area, layer, or part does not imply that the first component, area, layer, or part necessarily exists in this application.
[0037] To make the objectives, technical solutions, and advantages disclosed in the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this application and are not intended to limit the embodiments of this application.
[0038] This application provides an uninterruptible power supply based on a lithium battery. Figure 1 This is a schematic diagram of a lithium battery-based uninterruptible power supply provided in an embodiment of this application. Figure 1 ,like Figure 1 As shown, the lithium battery-based uninterruptible power supply includes a first power supply module 1, a UPS control module 2, and a lithium battery power supply module 3.
[0039] The two ends of the UPS control module 2 are connected to the first power supply module 1 and the load, respectively, and are responsible for providing uninterrupted power to the load.
[0040] like Figure 1As shown, the lithium battery power supply module 3 includes a lithium battery pack 31, a lithium battery management system 32, a charging module 33, and a discharging module 34. The first end of the charging module 33 is connected to the first power supply module 1, and the second end is connected to the lithium battery pack 31, allowing the first power supply module 1 to charge the lithium battery pack 31 via the charging module 33. The first end of the discharging module 34 is connected to the UPS control module 2, and the second end is connected to the lithium battery pack 31, allowing the lithium battery pack 31 to discharge to the UPS control module 2 via the discharging module 34, serving as a backup power source for the first power supply module 1. The lithium battery management system 32 is connected to the charging module 33 and controls the charging module 33 to charge the lithium battery pack 31 from the first power supply module 1. The lithium battery management system 32 is also connected to the discharging module 34 and controls the discharging module 34 to discharge the lithium battery pack 31 to the UPS control module 2.
[0041] The UPS control module 2 can control the first power supply module 1 and the lithium battery pack 31 to take turns supplying power to the load, ensuring the continuous operation of the load.
[0042] With the above settings, the lithium battery power supply module 3 is set up separately, and the charging and discharging of the lithium battery pack 31 is managed independently by the lithium battery management system 32. This makes the lithium battery power supply module 3 an independent unit, not managed by the UPS control module 2. The UPS control module 2 and the lithium battery management system 32 process relevant data information independently without exchanging data with each other. The overall software architecture is simple, highly stable, and easy to maintain. As an independent unit, the lithium battery module can be directly connected to the existing uninterruptible power supply without changing the existing UPS control logic, reducing workload and expanding the application scenarios of lithium batteries in the field of uninterruptible power supplies.
[0043] Figure 2 This is a schematic diagram of a lithium battery-based uninterruptible power supply provided in an embodiment of this application. Figure 2 In one possible embodiment, the UPS control module 2 includes a DC bus 21, a first static switch 22, and a second static switch 23.
[0044] like Figure 2 As shown, in one possible embodiment, the first static switch 22 and the DC bus 21 are connected in series; the first end of the DC bus 21 is connected to the first power supply module 1, and the second end is connected to the first end of the first static switch 22; the second end of the first static switch 22 is connected to the load. The lithium battery pack 31 is connected to the DC bus 21 through the discharge module 34 to supply power to the DC bus 21.
[0045] The second static switch 23 is connected in parallel with the DC bus 21 and the first static switch 22. The two ends of the second static switch 23 are connected to the first power supply module 1 and the load, respectively.
[0046] Therefore, the branch where the first static switch 22 is located is the backup power supply branch provided by the lithium battery pack 31, and the branch where the second static switch 23 is located is the common power supply branch where the first power supply module 1 is used as the power source.
[0047] A static switch is an electronic device used in power systems that can quickly and without mechanical action switch the current path. It can switch the current path in a very short time, usually at the millisecond level. Therefore, when the normal power supply branch where the second static switch 23 is located is abnormal, such as when the first power supply module 1 is faulty or unstable and cannot provide power, it can quickly switch to the backup power supply branch where the first static switch 22 is located, and be powered by the lithium battery pack 31.
[0048] With the above settings, UPS control module 2 can quickly and automatically switch between the primary power supply and the backup power supply to prevent power outages and maintain power supply.
[0049] In one possible embodiment, the UPS control module 2 further includes a rectifier 24 and an inverter 25. The rectifier 24 converts alternating current (AC) into direct current (DC), and the inverter 25 converts DC back into AC.
[0050] like Figure 2 As shown, the rectifier 24 is disposed between the first power supply module 1 and the first end of the DC bus 21, and the inverter 25 is disposed between the second end of the DC bus 21 and the first static switch 22.
[0051] With the above configuration, when the first power supply module 1 provides AC power, the rectifier 24 can convert the AC power output from the first power supply module 1 into DC power, ensuring that the current on the DC bus 21 is DC. Then, the inverter 25 converts the DC power back into AC power and outputs it to the load. The rectifier 24 and inverter 25 can rectify and invert the unstable power supply from the first power supply module 1 to the load, optimizing the poor power quality.
[0052] In this embodiment, the discharge module 34 includes a unidirectional DC / DC converter module. A unidirectional DC / DC converter is a power electronic device used to convert the voltage of a DC power supply, and the conversion process is unidirectional, meaning energy can only be transferred in one direction. Compared to a traditional bidirectional DC / DC converter, a unidirectional DC / DC converter only allows electrical energy to flow from the input to the output, and not in the reverse direction.
[0053] In this embodiment, the unidirectional DC / DC conversion module ensures that the energy of the lithium battery pack 31 is transferred unidirectionally to the DC bus 21, thus protecting the lithium battery pack 31. Simultaneously, the unidirectional DC / DC conversion module can detect the voltage state of the DC bus 21 and stop supplying power to the DC bus 21 based on this voltage state. When the first power supply module 1 malfunctions, the unidirectional DC / DC conversion module can detect the absence of voltage on the DC bus 21 and discharge to it; when the first power supply module 1 returns to normal, the unidirectional DC / DC conversion module can detect the presence of voltage on the DC bus 21 and control the lithium battery pack 31 to stop discharging.
[0054] In another scenario, when the lithium battery pack 31 has finished discharging, i.e., when the lithium battery management system 32 detects that the battery capacity of the lithium battery pack 31 is lower than the preset charge or the individual cell voltage is lower than the preset minimum voltage, the lithium battery management system 32 controls the unidirectional DC / DC conversion module to stop discharging.
[0055] In one possible embodiment, the charging module 33 includes a unidirectional AC / DC converter module. A unidirectional AC / DC converter module is a power electronic device used to convert alternating voltage into direct current voltage, and the conversion process is unidirectional, that is, energy can only be transferred in one direction.
[0056] In this embodiment, the unidirectional AC / DC conversion module is used to convert the AC power output from the first power supply module 1 into DC power to charge the lithium battery pack 31, based on the control of the lithium battery management system 32. When the first power supply module 1 returns to normal, the lithium battery management system 32 sends a charging request command to the unidirectional AC / DC conversion module according to the power status of the lithium battery pack 31, and the unidirectional AC / DC conversion module begins to charge the lithium battery pack 31.
[0057] In one possible embodiment, the first power supply module 1 includes a mains power supply 11 and a step-down transformer 12. The step-down transformer 12 is disposed between the mains power supply 11 and the UPS control module 2, and performs voltage reduction processing on the voltage provided by the mains power supply 11, converting the 10KV voltage to a 0.4KV voltage.
[0058] In one possible embodiment, the first power supply module 1 further includes a first switch 13, which is disposed between the step-down transformer 12 and the UPS control module 2. When the first switch 13 is closed, the first power supply module 1 can normally supply power to the UPS control module 2; when the first switch 13 is opened, the first power supply module 1 stops supplying power to the UPS control module 2.
[0059] In one possible embodiment, the UPS control module 2 further includes a maintenance switch 14. The maintenance switch 14 is connected in parallel with the second static switch 23, the DC bus 21, and the first static switch 22. When neither the first power supply module 1 nor the lithium battery pack 31 can provide power, the load can be connected to other backup power sources to ensure uninterrupted power supply.
[0060] The following are different operating scenarios for uninterruptible power supplies:
[0061] 1. When the mains power supply 11 is normal, the mains power supply 11 supplies power to the load through the second static switch 23 of the UPS control module 2;
[0062] 2. When there is a problem with the power quality of the mains power supply 11, the mains power supply 11 is rectified by the rectifier 24 of the UPS control module 2, and then inverted by the inverter 25 to supply power to the load through the first static switch 22.
[0063] 3. When the mains power supply 11 fails, the lithium battery pack 31 discharges to the DC bus 21 through the unidirectional DC / DC conversion module. The electrical energy is converted into AC through the inverter 25 and then supplied to the load through the first static switch 22.
[0064] When the battery discharge is complete, and the lithium battery management system 32 detects that the battery capacity is lower than the preset charge or the single cell voltage is lower than the preset minimum voltage, the lithium battery management system 32 controls the unidirectional DC / DC conversion module to stop discharging.
[0065] 4. When the mains power is restored, the rectifier 24 of the UPS control module 2 outputs DC voltage. The unidirectional DC / DC conversion module detects the voltage on the DC bus 21 and controls the battery to stop discharging. At the same time, the lithium battery management system 32 sends a charging request command to the unidirectional AC / DC conversion module according to the battery status, and the unidirectional AC / DC conversion module starts charging the battery.
[0066] Throughout the entire uninterruptible power supply operation process, the lithium battery management system does not need to exchange data with the UPS control module 2.
[0067] This application also provides an uninterruptible power supply. Figure 3 This application provides an embodiment of an uninterruptible power supply, such as... Figure 3 As shown, the uninterruptible power supply includes a second power supply module 4 and the aforementioned lithium battery-based uninterruptible power supply.
[0068] In one possible embodiment, the second power supply module 4 includes a lead-acid battery 41. The lead-acid battery 41 is connected to the UPS control module 2 and is used to supply power to the UPS control module 2.
[0069] like Figure 3As shown, lead-acid battery 41 is also connected to DC bus 21 of UPS control module 2. When the first power supply module 1 fails or becomes unstable, it can serve as a backup power supply for the load.
[0070] In other possible embodiments, the second power supply module 4 may also include other types of batteries as backup power.
[0071] In one possible embodiment, the second power supply module 4 further includes a second switch 42, which is disposed between the lead-acid battery 41 and the UPS control module 2. Since the lead-acid battery 41 has a short lifespan and a limited number of cycles, when the lead-acid battery 41 no longer meets usage requirements and is retired, the second switch 42 can be disconnected to remove the lead-acid battery 41 from the uninterruptible power supply.
[0072] In another possible embodiment, the uninterruptible power supply (UPS) based on lead-acid battery 41 can also directly connect to the lithium battery power supply module 3. When lead-acid battery 41 needs to be decommissioned, it can be directly removed. In this case, there is no need to change the control logic of the original UPS based on lead-acid battery 41, and the lithium battery management system 32 does not need to communicate with the UPS control module 2, reducing workload and expanding the application scenarios of lithium batteries in the field of UPS. Especially in some old data center renovation scenarios, there are situations where lead-acid batteries 41 need to be decommissioned but the overall UPS can still operate. This method can directly replace them without changing the UPS control strategy, making use of the original UPS and improving the utilization rate of UPS equipment.
[0073] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, specific embodiments have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims can be performed in a different order than that shown in the embodiments and still achieve the desired result. Additionally, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
[0074] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.
[0075] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.
[0076] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A lithium battery based uninterruptible power supply, characterized by, It includes a first power supply module (1), a UPS control module (2), and a lithium battery power supply module (3); The two ends of the UPS control module (2) are respectively connected to the first power supply module (1) and the load; The lithium battery power supply module (3) includes a lithium battery pack (31), a lithium battery management system (32), a charging module (33), and a discharging module (34). The first end of the charging module (33) is connected to the first power supply module (1), and the second end is connected to the lithium battery pack (31). The first end of the discharging module (34) is connected to the UPS control module (2), and the second end is connected to the lithium battery pack (31). The lithium battery management system (32) is connected to the charging module (33) and is used to control the charging module (33) to charge the lithium battery pack (31) from the first power supply module (1). The lithium battery management system (32) is also connected to the discharging module (34) and is used to control the discharging module (34) to discharge the lithium battery pack (31) to the UPS control module (2).
2. The lithium battery-based uninterruptible power supply of claim 1, wherein, The UPS control module (2) includes a DC bus (21), a first static switch (22), and a second static switch (23); The first static switch (22) and the DC bus (21) are connected in series; the first end of the DC bus (21) is connected to the first power supply module (1), and the second end is connected to the first end of the first static switch (22); the second end of the first static switch (22) is connected to the load. The second static switch (23) is connected in parallel with the DC bus (21) and the first static switch (22), and the two ends of the second static switch (23) are respectively connected to the first power supply module (1) and the load; The lithium battery pack (31) is connected to the DC bus (21) through the discharge module (34) to supply power to the DC bus (21).
3. The lithium battery-based uninterruptible power supply of claim 2, wherein, The UPS control module (2) also includes a rectifier (24) and an inverter (25); The rectifier (24) is disposed between the first power supply module (1) and the first end of the DC bus (21), and the inverter (25) is disposed between the second end of the DC bus (21) and the first static switch (22).
4. The lithium battery-based uninterruptible power supply of claim 3, wherein, The discharge module (34) includes a unidirectional DC / DC conversion module, which is used to detect the voltage state of the DC bus (21) and stop supplying power to the DC bus (21) based on the voltage state of the DC bus (21).
5. The lithium battery-based uninterruptible power supply of claim 3, wherein, The charging module (33) includes a unidirectional AC / DC conversion module, which is used to convert the AC power output by the first power supply module (1) into DC power to charge the lithium battery pack (31) based on the control of the lithium battery management system (32).
6. The uninterruptible power supply based on a lithium battery according to claim 3, characterized in that, The first power supply module (1) includes a mains power supply (11) and a step-down transformer (12); The step-down transformer (12) is located between the mains power supply (11) and the UPS control module (2).
7. The lithium battery-based uninterruptible power supply of claim 6, wherein, The first power supply module (1) also includes a first switch (13); the first switch (13) is disposed between the step-down transformer (12) and the UPS control module (2).
8. The lithium battery-based uninterruptible power supply of claim 2, wherein, The UPS control module (2) also includes a maintenance switch (14); the maintenance switch (14) is connected in parallel with the second static switch (23), the DC bus (21) and the first static switch (22).
9. An uninterruptible power supply, characterized by Includes a second power supply module (4) and a lithium battery-based uninterruptible power supply as described in any one of claims 1-8; The second power supply module (4) includes a lead-acid battery (41); the lead-acid battery (41) is connected to the UPS control module (2) and is used to supply power to the UPS control module (2).
10. The uninterruptible power supply of claim 9, wherein, The second power supply module (4) also includes a second switch (42), which is disposed between the lead-acid battery (41) and the UPS control module (2).