Battery energy storage power supply system

Abstract

The utility model provides a battery energy storage and power supply system, which comprises a plurality of energy storage and power supply units, each energy storage and power supply unit comprises a storage battery management system, a storage battery cluster, an energy storage and power supply equalization module and an uninterruptible power supply module, and the storage battery cluster and the corresponding energy storage and power supply equalization module are connected in series and then are connected to a direct current bus; the uninterruptible power supply module is connected to two ends of the energy storage power supply equalization module; and the uninterruptible power supply module is also connected to a corresponding storage battery management system. The storage battery cluster is connected in series with the energy storage power supply equalization module, so that the uninterruptible power supply takes power from the energy storage power supply equalization module, the system size is reduced, and the system cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery energy storage, and particularly relates to a battery energy storage power supply system. BACKGROUND

[0002] A large energy storage system is generally composed of multiple battery cluster systems in parallel, and each battery cluster is equipped with an uninterruptible power supply module to maintain the normal operation of the battery management system. However, in the structure of the energy storage system provided by the prior art, the uninterruptible power supply module generally directly takes power from the corresponding battery cluster to supply the corresponding battery management system. In this case, since the battery cluster is a high-voltage energy storage, the uninterruptible power supply module obtains high-voltage power. High-voltage power requires a large electrical safety distance, thereby causing the entire energy storage system to be large in size. Similarly, the uninterruptible power supply also needs to use high-voltage devices to take power from the battery cluster, which increases the overall power supply cost. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the purpose of the present application is to at least provide a battery energy storage power supply system, which makes the uninterruptible power supply take power from the energy storage power supply balancing module by connecting the battery cluster in series with the energy storage power supply balancing module, thereby reducing the system size and the system cost.

[0004] The present application mainly includes the following aspects:

[0005] In a first aspect, the embodiments of the present application provide a battery energy storage power supply system. The battery energy storage power supply system includes multiple energy storage power supply units. Each energy storage power supply unit includes a battery management system, a battery cluster, an energy storage power supply balancing module, and an uninterruptible power supply module. The battery cluster is connected in series with the corresponding energy storage power supply balancing module and then connected to a DC bus. The uninterruptible power supply module is connected to both ends of the energy storage power supply balancing module. The uninterruptible power supply module is also connected to the corresponding battery management system.

[0006] In a possible implementation, the multiple energy storage power supply units are connected in parallel.

[0007] In a possible implementation, the uninterruptible power supply module includes a starting power assembly and an energy storage power supply assembly. The starting power assembly and the energy storage power supply assembly are respectively connected to the corresponding battery management system. The energy storage power supply assembly is also connected to both ends of the energy storage power supply balancing module.

[0008] In a possible implementation, the starting power assembly includes an alternating current power source, an alternating current-direct current converter, and a first anti-reverse module. The input end of the alternating current-direct current converter is connected to the alternating current power source. The output end of the alternating current-direct current converter is respectively connected to one end of the first anti-reverse module. The other end of the first anti-reverse module is respectively connected to the power supply end of the energy storage power supply balancing module and the battery management system.

[0009] In a possible implementation, the energy storage power supply assembly comprises a DC-DC converter, wherein a first input end of the DC-DC converter is connected to the positive pole of the energy storage power supply equalization module, a second input end of the DC-DC converter is connected to the negative pole of the energy storage power supply equalization module, and an output end of the DC-DC converter is connected to the battery management system.

[0010] In a possible implementation, the energy storage power supply assembly further comprises a second anti-reverse module, wherein one end of the second anti-reverse module is connected to the output end of the DC-DC converter, and the other end of the second anti-reverse module is connected to the battery management system.

[0011] In a possible implementation, the anti-reverse module is an anti-reverse diode, one end of the anti-reverse module is the anode of the anti-reverse diode, and the other end of the anti-reverse module is the cathode of the anti-reverse diode.

[0012] In a possible implementation, the AC-DC converter adopts an isolation topology or a non-isolation topology.

[0013] In a possible implementation, the DC-DC converter adopts an isolation topology or a non-isolation topology.

[0014] In a possible implementation, the energy storage power supply equalization module adopts a DC-DC converter.

[0015] The battery energy storage power supply system provided by the embodiments of the present application comprises a plurality of energy storage power supply units, and each energy storage power supply unit comprises a battery management system, a battery cluster, an energy storage power supply equalization module, and an uninterruptible power supply module, wherein the battery cluster and the corresponding energy storage power supply equalization module are connected in series and then connected to a DC bus; the uninterruptible power supply module is connected to both ends of the energy storage power supply equalization module; and the uninterruptible power supply module is also connected to the corresponding battery management system. By connecting the battery cluster and the energy storage power supply equalization module in series, the uninterruptible power supply module draws power from the energy storage power supply equalization module, thereby reducing the system size and the system cost.

[0016] In order to make the above objectives, characteristics and advantages of the present application more apparent and easy to understand, the following will describe a preferred embodiment in detail, and the accompanying drawings will be referred to, as follows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1One of the energy storage system power supply schemes provided by the prior embodiment is shown;

[0019] Figure 2 One of the energy storage system power supply schemes provided by the prior embodiment is shown;

[0020] Figure 3 A structural schematic diagram of a battery energy storage power supply system provided by the embodiment of the application is shown;

[0021] Figure 4 A structural schematic diagram of an energy storage power supply unit provided by the embodiment of the application is shown. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. It should be understood that the drawings in the application only serve the purpose of description and illustration, and are not used to limit the protection scope of the application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts show the operations implemented according to some embodiments of the application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content of the application by those skilled in the art.

[0023] In addition, the described embodiments are only some of the embodiments of the application, not all the embodiments. The components of the embodiments of the application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0024] The large energy storage system is composed of multiple battery cluster systems in parallel, and each battery cluster is equipped with an uninterruptible power supply module to maintain the normal operation of the battery control system. Please refer to Figure 1 , Figure 1 One of the energy storage system power supply schemes provided by the prior embodiment is shown. As shown in the energy storage system power supply scheme, Figure 1 The corresponding uninterruptible power supply module includes an AC-DC conversion module 11 and a DC-DC conversion module 12.

[0025] Wherein, the battery cluster BAT is connected to the DC bus, the AC-DC conversion module 11 is connected to the 220V AC power supply (220VAC), the 220VAC is output to the battery control system 3 through the AC-DC conversion module 11, the DC-DC conversion module 12 is directly connected in parallel to both ends of the battery cluster BAT, and the battery cluster BAT supplies power to the battery control system 3 through the DC-DC conversion module 12.

[0026] The scheme adopts the 220VAC AC power supply AC-DC conversion module 11 and the battery cluster BAT connected in series in the DC bus DC-DC conversion module 12 to realize the power supply redundancy backup of the battery control system 3. When the 220VAC AC power grid has a short-time power failure, the DC-DC conversion module 12 can continue to take over the work, thereby realizing the purpose of uninterruptible power supply.

[0027] Please refer to Figure 2 , Figure 2 A second power supply scheme of an energy storage system provided by the prior embodiment is shown. As shown in Figure 2 , the power supply scheme of the energy storage system adopts the 220V AC power supply AC-DC conversion module 11 and the DC-DC conversion module 12 supplied by the battery cluster BAT parallel DC / DC converter output DC bus, to realize the power supply redundancy backup of the battery control system 3. When the 220VAC AC power grid has a short-time power failure, the DC-DC conversion module 12 can continue to take over the work, thereby realizing the purpose of uninterruptible power supply.

[0028] The two conventional energy storage system power supply schemes mainly have the following problems:

[0029] ① The DC-DC conversion module 12 in the uninterruptible power supply module takes power from the battery cluster, and the voltage is high voltage, which requires a large electrical safety distance, resulting in a large volume of the energy storage system;

[0030] ② The input voltage of the DC-DC conversion module 12 is high, and high-voltage devices need to be used, which is high in cost.

[0031] Based on this, the battery energy storage power supply system provided by the embodiment of the application is provided, which takes power from the energy storage power supply balancing module by the battery cluster in series, reduces the system volume and reduces the system cost, and the specific implementation is as follows:

[0032] Please refer to Figure 3 , Figure 3 A structure diagram of a battery energy storage power supply system provided by the embodiment of the application is shown. As shown in Figure 3As shown, the battery energy storage power supply system provided by the embodiments of the present application includes a plurality of energy storage power supply units A1-An, each of which includes a battery management system 1, a battery cluster BAT, an energy storage power supply equalization module 2, and an uninterruptible power supply module 3NUM.

[0033] In a preferred embodiment, the plurality of energy storage power supply units A1-An are connected in parallel to a DC bus, and for each energy storage power supply unit:

[0034] The battery cluster BAT is connected in series with the corresponding energy storage power supply equalization module 2 and then connected to the DC bus. Specifically, the positive electrode of the DC bus is connected to the positive electrode of the energy storage power supply equalization module 2, the negative electrode of the energy storage power supply equalization module 2 is connected to the positive electrode of the battery cluster BAT, and the negative electrode of the battery cluster BAT is connected to the negative electrode of the DC bus L.

[0035] The uninterruptible power supply module 3NUM is connected across the energy storage power supply equalization module 2, i.e., the uninterruptible power supply module 3NUM is connected to the positive electrode of the energy storage power supply equalization module 2 and the negative electrode of the energy storage power supply equalization module 2.

[0036] The uninterruptible power supply module 3NUM is also connected to the corresponding battery management system 1.

[0037] In a preferred embodiment, as shown in Figure 3 The uninterruptible power supply module 3NUM includes a starting power supply component 31 and an energy storage power supply component 32.

[0038] Preferably, the starting power supply component 31 and the energy storage power supply component 32 are respectively connected to the corresponding battery management system 1, and the energy storage power supply component 32 is also connected across the energy storage power supply equalization module 2.

[0039] In a preferred embodiment, as shown in Figure 4 , Figure 4 The structure of the energy storage power supply unit provided by the embodiments of the present application is shown. As shown in Figure 4 The starting power supply component 31 includes an AC power supply 311, an AC-DC converter AC / DC, and a first anti-reverse module 312.

[0040] Specifically, the input end of the AC-DC converter AC / DC is connected to the AC power supply 311, and the output end of the AC-DC converter AC / DC is respectively connected to one end of the first anti-reverse module 312. The other end of the first anti-reverse module 312 is respectively connected to the power supply end of the energy storage power supply equalization module 2 (not shown in the figure) and the battery management system 1.

[0041] Preferably, the AC power supply 311 is 220VAC (220V AC power supply).

[0042] As shown in Figure 4As shown, the first anti-reverse module 312 can be an anti-reverse diode.

[0043] In another preferred embodiment, as shown in Figure 4 The energy storage power supply assembly 32 includes a DC-DC converter DC / DC and a second anti-reverse module 321.

[0044] The first input end of the DC-DC converter DC / DC is connected to the positive pole of the energy storage power supply equalization module 2, the second input end of the DC-DC converter DC / DC is connected to the negative pole of the energy storage power supply equalization module 2, the output end of the DC-DC converter DC / DC is connected to one end of the second anti-reverse module 321, and the other end of the second anti-reverse module 321 is connected to the battery management system 1.

[0045] As shown in Figure 4 The second anti-reverse module 321 can be an anti-reverse diode.

[0046] One end of the anti-reverse module is the anode of the anti-reverse diode, and the other end of the anti-reverse module is the cathode of the anti-reverse diode.

[0047] In a specific embodiment, as shown in Figure 4 The DC bus voltage range is 1000V-1500V.

[0048] The energy storage power supply equalization module 2 selects a DC-DC converter with an output voltage range of 10V-40V. In this application, for each energy storage power supply unit, its corresponding battery cluster BAT is connected to the DC bus through a corresponding energy storage power supply equalization module 2 in series. Because the output voltage range of the energy storage power supply equalization module 2 is within a specified voltage range, the energy storage power supply equalization module 2 can balance the voltage difference between each battery cluster and prevent circulating current between the battery clusters.

[0049] The AC-DC converter AC / DC and the DC-DC converter adopt an isolation topology or a non-isolation topology.

[0050] Specifically, for example, the AC-DC converter AC / DC adopts an isolation topology or a non-isolation topology, where the isolation topology is not limited to flyback topology, forward topology, push-pull topology, full-bridge topology, and half-bridge topology. Energy is provided by 220VAC, and the output is 24V.

[0051] The DC-DC converter DC / DC in the uninterruptible power supply module 3 NUM selects an isolation topology or a non-isolation topology. The DC-DC converter DC / DC in the uninterruptible power supply module 3 NUM is provided with energy by the DC bus connected in series with the energy storage power supply equalization module 2, with an input voltage of 10V-40V and an output of 24V.

[0052] In the application, the battery cluster is connected in series with the energy storage power supply equalization module 2, so that the input and output of the DC-DC converter DC / DC in the uninterrupted power supply module 3 NUM are low voltage, thereby reducing the device cost of the entire energy storage power supply unit and improving the conversion efficiency.

[0053] The working process of the energy storage power supply unit provided in the application is as follows:

[0054] ① When the battery energy storage power supply system is powered on, for each energy storage power supply unit: 220VAC is connected to the corresponding AC-DC converter AC / DC under the control of the operator, at this time the AC-DC converter AC / DC works to provide 24V working power for the battery management system 1 and the energy storage power supply equalization module 2.

[0055] ③ After the battery management system input 24V starts, the working start signal of the energy storage power supply equalization module 2 is triggered, so that the energy storage power supply equalization module 2 is in a working state after the signal.

[0056] ④ After the energy storage power supply equalization module 2 works, it automatically outputs a bus voltage of 10V-40V, wherein,

[0057] The output voltage of the energy storage power supply equalization module 2 is determined by the corresponding output voltage of the battery cluster connected in series, which balances the voltage difference between the parallel connected battery clusters. Specifically, all battery clusters should have the same voltage level in theory, but due to manufacturing differences, aging degree or different charging and discharging states, voltage inconsistency may occur in actual operation. In the application, by connecting an independent energy storage power supply equalization module 2 for each battery cluster, the voltage output by each battery cluster can be adjusted to a uniform voltage level suitable for the DC bus, preventing circulating current between the battery clusters.

[0058] ⑤ The DC-DC converter DC / DC in the uninterrupted power supply module starts to work after receiving the bus voltage provided by the energy storage power supply equalization module 2, and realizes redundant backup for the battery management system power supply with the AC-DC converter AC / DC.

[0059] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the system and the device described above can refer to the corresponding process in the foregoing method embodiments, and will not be repeated here. In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0060] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0061] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0062] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or the parts of the technical solutions can be embodied in the form of software products, and the computer software products are stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, and various program code storage media.

[0063] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery energy storage power supply system, characterized by, The battery energy storage power supply system comprises a plurality of energy storage power supply units, the energy storage power supply unit comprising a battery management system, a battery cluster, an energy storage power supply equalization module and an uninterruptible power supply module, The battery cluster and the corresponding energy storage power supply equalization module are connected in series and then connected to a DC bus. The uninterruptible power supply module is connected to both ends of the energy storage power supply equalization module. The uninterruptible power supply module is also connected to the corresponding battery management system.

2. The battery energy storage system of claim 1, wherein, The plurality of energy storage power supply units are connected in parallel.

3. The battery energy storage system of claim 1, wherein, The uninterruptible power supply module comprises a starting power supply component and an energy storage power supply component, The starting power supply component and the energy storage power supply component are connected to the corresponding battery management system, and the energy storage power supply component is also connected to both ends of the energy storage power supply equalization module.

4. The battery energy storage system of claim 3, wherein, The starting power supply component comprises an alternating current power supply, an alternating current-direct current converter and a first anti-reverse module, The input end of the alternating current-direct current converter is connected to the alternating current power supply, the output end of the alternating current-direct current converter is connected to one end of the first anti-reverse module, and the other end of the first anti-reverse module is connected to the power supply end of the energy storage power supply equalization module and the battery management system.

5. The battery energy storage system of claim 3, wherein, The energy storage power supply component comprises a direct current-direct current converter, The first input end of the direct current-direct current converter is connected to the positive electrode of the energy storage power supply equalization module, the second input end of the direct current-direct current converter is connected to the negative electrode of the energy storage power supply equalization module, and the output end of the direct current-direct current converter is connected to the battery management system.

6. The battery energy storage system of claim 5, wherein, The energy storage power supply component further comprises a second anti-reverse module, One end of the second anti-reverse module is connected to the output end of the direct current-direct current converter, and the other end of the second anti-reverse module is connected to the battery management system.

7. The battery energy storage system of claim 4 or 6, wherein, The anti-reverse module is an anti-reverse diode, one end of the anti-reverse module is the anode of the anti-reverse diode, and the other end of the anti-reverse module is the cathode of the anti-reverse diode.

8. The battery energy storage system of claim 4, wherein, The alternating current-direct current converter adopts an isolation topology structure or a non-isolation topology structure.

9. The battery energy storage system of claim 5, wherein, The direct current-direct current converter adopts an isolation topology structure or a non-isolation topology structure.

10. The battery energy storage system of claim 1, wherein, The energy storage power supply equalization module adopts a direct current-direct current converter.

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