Extensible micro energy storage device and extension method and operation method thereof

Abstract

The invention discloses an extensible micro energy storage device and an extension method and an operation method thereof, relates to the field of new energy, and aims to provide an energy storage device which supports capacity extension deployment and is simple and convenient in extension and use process. The micro-energy storage device comprises at least one micro-energy storage module, and when the multiple micro-energy storage modules are arranged, the micro-energy storage modules are sequentially connected in series; each micro-energy storage module comprises at least one micro-energy storage unit, and when a plurality of micro-energy storage units are arranged, the micro-energy storage units are connected in series. According to the invention, the smooth expansion of the micro energy storage unit is pertinently carried out as required, and the operation is very convenient. According to the invention, automatic alarm of line misconnection can be carried out, the possibility of line misconnection can be reduced, and the complexity of on-site construction and confirmation can be simplified.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to an expandable micro energy storage device, an expansion method of the expandable micro energy storage device, and an operation method of the expandable micro energy storage device. Background Art

[0002] The energy storage facilities of new energy power generation units (such as photovoltaic panels or wind turbines) usually have a fixed capacity. Taking a photovoltaic power plant as an example, the energy storage facilities of a photovoltaic power plant usually concentrate the electricity from all photovoltaic panels into the same energy storage battery assembly. During installation, the energy storage battery assembly is usually installed on site with a fixed capacity.

[0003] However, with the innovation of technology, the power generation of new energy power generation units has been greatly improved, and it is expected to continue to increase in the future. The traditional fixed-capacity energy storage method may be able to meet the energy storage requirements of a certain power increase by reserving a part of the capacity, but it is only a stopgap measure and will sooner or later fail to meet the ever-changing energy storage needs. At that time, it will still be necessary to store excess electricity through new energy storage battery components. The hardware cost of new energy storage battery components is very expensive, and the required new capacity is inconvenient to estimate. Too much or cause waste, too little will need to be rebuilt later, and the new installation process and wiring planning are also quite complicated. Summary of the invention

[0004] The object of the present invention is to provide an expandable micro energy storage device and its expansion method and operation method to address all or part of the above-mentioned problems, so as to provide an energy storage device that supports capacity expansion deployment and has a simple expansion and use process.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An expandable micro energy storage device, characterized by comprising:

[0007] At least one micro energy storage module, when there are multiple micro energy storage modules, each micro energy storage module is connected in series in sequence;

[0008] Each of the micro energy storage modules includes at least one micro energy storage unit. When there are multiple micro energy storage units, the micro energy storage units are connected in series.

[0009] Furthermore, in any micro energy storage module, the DC input end of the micro energy storage unit is connected to the new energy power generation unit, or connected to the DC output end of the previous micro energy storage unit; the DC output end of the micro energy storage unit is connected to the DC input end of the next micro energy storage unit, or serves as the DC output end of the micro energy storage module to connect to the DC output end of the adjacent micro energy storage module.

[0010] Furthermore, each of the micro energy storage units includes a battery pack, a battery management module and a communication module which are connected in sequence, and the communication module is responsible for information exchange between the micro energy storage unit and the outside world.

[0011] Furthermore, a detection circuit is provided on both the DC input terminal and the DC output terminal of the micro energy storage unit, and the detection circuit is configured to detect the position of the micro energy storage unit in the micro energy storage module.

[0012] Furthermore, each of the micro energy storage units also includes a power optimizer and a DC-DC converter, the DC-DC converter is connected to the DC input end, and the power optimizer is connected between the DC-DC converter and the battery management module.

[0013] Furthermore, each of the micro energy storage units also includes an alarm, and the alarm is connected to the battery management module.

[0014] The present invention also provides an expansion method of the above-mentioned expandable micro energy storage device, which comprises:

[0015] A micro energy storage unit, or multiple micro energy storage units connected in series, is connected in series between two micro energy storage units of a target micro energy storage module.

[0016] Furthermore, the extension method also includes:

[0017] At least one micro energy storage unit in the target micro energy storage module is removed, and micro energy storage units adjacent to the removed positions are connected in series.

[0018] Furthermore, the extension method also includes:

[0019] Removing at least one micro energy storage unit in the target micro energy storage module;

[0020] At least one new micro energy storage unit is connected in series between the micro energy storage units adjacent to the removed positions.

[0021] The present invention also provides an operating method of the above-mentioned expandable micro energy storage device, which comprises:

[0022] Each micro energy storage unit receives instructions through the communication module respectively, and starts to start after receiving the first instruction;

[0023] After successfully starting, all micro energy storage units send out an alarm signal through the alarm device and report the startup success information through the communication module.

[0024] Furthermore, the operation method also includes:

[0025] When any micro energy storage unit works abnormally, an alarm signal is sent out through the alarm device.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. The energy storage device designed by the present invention assembles micro energy storage units in a serial manner and combines each micro energy storage module in a series manner, which can support longitudinal serial expansion in a single micro energy storage module and also support lateral serial expansion of micro energy storage modules, so as to achieve smooth capacity upgrade. The operation is extremely simple, and it is only necessary to directly connect the micro energy storage unit (or group string) to the position where the capacity expansion is required, or directly connect the micro energy storage module in series to the existing micro energy storage module link, so that when the capacity expansion is required, the energy storage device that needs to be expanded can be expanded in a targeted and on-demand manner, without changing the original wiring, and the expanded capacity matches the demand, and even if the expansion operation is required, it is extremely convenient.

[0028] 2. The energy storage device of the present invention can realize distributed management, can start or stop all micro energy storage units in a unified manner, can grasp the status of each micro energy storage unit, can locate the position of each micro energy storage unit, and then quickly locate the target unit by etching.

[0029] 3. Each micro energy storage unit of the present invention can automatically alarm when a fault occurs, making it easy for maintenance personnel to quickly locate and repair it. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0031] Figure 1 It is a circuit structure diagram of a micro energy storage module in one embodiment.

[0032] Figure 2 It is a connection diagram of each micro energy storage module in the micro energy storage device.

[0033] Figure 3 This is an example of incorrect wiring in a micro energy storage module.

[0034] Figure 4 This is an example of incorrect wiring between micro energy storage modules.

[0035] In the figure, 200 is a new energy power generation unit, 201 is a micro energy storage unit, 202 is a communication module, 203 is a speaker, 204 is a light emitting diode, 205 is an MC4 connector, and 300 is a micro energy storage power generation module. DETAILED DESCRIPTION

[0036] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0037] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0038] Example 1

[0039] An expandable micro energy storage device includes one or more micro energy storage modules 300. When the number of micro energy storage modules 300 exceeds one (two or more), each micro energy storage module 300 is connected in series in sequence. Figure 2 The embodiment shown is a micro energy storage device with three micro energy storage modules 300, which are connected in series in sequence, that is, the positive DC output terminal of one micro energy storage module 300 is connected to the negative DC output terminal of the previous micro energy storage module 300, and its negative DC output terminal is connected to the positive DC output terminal of the next micro energy storage module 300. A larger number of micro energy storage modules 300 are connected in the same manner.

[0040] Each micro energy storage module 300 includes one or more micro energy storage units 201. When the number of micro energy storage units 201 exceeds one, the micro energy storage units 201 are connected in series. It should be noted that the number of micro energy storage units 201 in each micro energy storage module 300 does not need to be equal.

[0041] Regarding the connection relationship between the micro energy storage unit 201 inside and outside the micro energy storage module 300 , except for the last micro energy storage unit 201 , the remaining micro energy storage units 201 are all vectors with the new energy power generation unit 200 or other micro energy storage units 201 in the micro energy storage module 300 .

[0042] Specifically, in any micro energy storage module 300, the DC input end of the micro energy storage unit 201 is connected to the new energy generation unit 200, or connected to the DC output end of the previous micro energy storage unit 201; the DC output end of the micro energy storage unit 201 is connected to the DC input end of the next micro energy storage unit 201, or as the DC output end of the micro energy storage module 300 (i.e. the micro energy storage module 300 in which it is located) is connected to the DC output end of the adjacent micro energy storage module 300. The so-called adjacent refers to the micro energy storage modules 300 that are connected in series with the current micro energy storage unit 201.

[0043] In some embodiments, each micro energy storage unit 201 includes four ports, namely: two DC input terminals (one positive and one negative) connected to the front-end input device (such as the new energy generation unit 200 or the previous micro energy storage unit 201), and two DC output terminals (one positive and one negative) connected to the back-end device. Figure 2As shown, in a micro energy storage module 300, the two DC input terminals of the first micro energy storage unit 201 are connected to the two DC output terminals of the new energy generation unit 200, and its two DC output terminals are connected to the two DC input terminals of the second micro energy storage unit 201; and the two DC input terminals of the second micro energy storage unit 201 are connected to the two DC output terminals of the first micro energy storage unit 201 (the positive DC input terminal is connected to the negative DC output terminal, and vice versa), and its two DC output terminals serve as the two DC output terminals of the micro energy storage module 300. Figure 3 As an example, assume that Figure 2 The micro energy storage module 300 shown is Figure 3 The second micro energy storage module 300 in Figure 2 The positive DC output terminal of the second micro energy storage unit 201 is connected to Figure 3 The negative DC output terminal of the first micro energy storage module 300, Figure 2 The negative DC output terminal of the second micro energy storage unit 201 is connected to Figure 3 The positive DC output terminal of the third micro energy storage module 300. For the connection on the input and output terminals of the micro energy storage unit 201, in some embodiments, the connection is made through the MC4 connector 205 to achieve rapid and standardized interconnection.

[0044] like Figure 1 As shown, for each micro energy storage unit 201, in some embodiments, distributed management and control are implemented. To this end, each micro energy storage unit 201 includes a communication module 202 in addition to the basic battery pack and battery management module (BMS). The communication module 202 is responsible for the information interaction between the micro energy storage unit 201 and the outside world, such as the information interaction with the remote control center in some application scenarios. In a specific implementation, the communication module 202 is a wireless communication module, such as a wide area Internet of Things communication module, to achieve low-power, high-throughput distributed management.

[0045] In addition, in order to facilitate more fine-grained management of each micro energy storage unit 201 and facilitate rapid positioning of the micro energy storage unit 201 in case of failure or other needs, a detection circuit is provided on the DC input and DC output ends of the micro energy storage unit 201. The detection circuit is used to detect the position of the micro energy storage unit 201 in the micro energy storage module 300, for example, whether it is the first micro energy storage unit 201 connected to the new energy power generation unit 200, or the second micro energy storage unit 201 connected in series, or a micro energy storage unit 201 in other positions, or a micro energy storage unit 201 connected to an adjacent micro energy storage module 300. In some embodiments, the detection circuit is connected to the communication module 202 to report the position of the micro energy storage unit 201 in the micro energy storage device through the communication module 202.

[0046] For each micro energy storage unit 201, since it is a serial installation and expansion, each micro energy storage unit 201 is packaged in advance. In addition to the battery pack, battery management module, communication module 202, and possible detection circuits mentioned above, it also includes a power optimizer and a DC-DC converter. The DC-DC converter is connected to the DC input terminal for voltage or frequency conversion, etc.; the power optimizer is connected between the DC-DC converter and the battery management module to perform maximum power tracking processing and output on the electric energy. The entire micro energy storage unit 201 is integrated in a sealed, waterproof facility to form an integral unit.

[0047] In addition, since each micro energy storage unit 201 is modularly designed and installed, it needs to be connected one by one during the initial installation or later expansion installation, so there is a possibility of misconnection of the lines. In this regard, an alarm is also configured in the micro energy storage unit 201, and the alarm is connected to the battery management module to alarm when the battery management module detects abnormal polarity connection of the input and output terminals, or when all micro energy storage units 201 are successfully started. In some embodiments, the alarm can be a sound alarm and / or a light alarm. For example Figure 1 The speaker 203 and the light emitting diode 204 are shown in FIG.

[0048] The micro energy storage unit 201 starts working after receiving the instruction to start through the communication module 202. After all the micro energy storage units 201 are successfully started, all alarms will be triggered to send out an alarm signal. At the same time, the communication module 202 can also report the start success signal. Figure 3 or Figure 4 In the case of Siamese misconnection shown, or other abnormal situations, the battery management module will obtain abnormal input current or output current, and trigger the corresponding alarm to send an alarm signal for on-site personnel to quickly locate and confirm. After the wiring is correct and all micro energy storage units 201 are successfully started, the startup success information is also reported at the same time.

[0049] Example 2

[0050] This part of the embodiments aims to introduce an expansion method of an expandable micro energy storage device.

[0051] In some extended embodiments of newly added micro energy storage units 201, the newly added micro energy storage units 201 are connected to the original micro energy storage device, which may include:

[0052] Scenario 1: Adding to a certain micro energy storage module 300. Connect the micro energy storage unit 201 to be added in series between the two micro energy storage units 201 of the target micro energy storage module 300. Specifically, first disconnect the two micro energy storage units 201 at the extension, then connect the DC input end of the added micro energy storage unit 201 to the DC output end of the disconnection, and connect the DC output end of the added micro energy storage unit 201 to the DC input end of the disconnection.

[0053] It should be noted that the newly added micro energy storage unit 201 can be one or more. The operations in the two cases are similar, both of which are to connect the newly added micro energy storage unit 201 in series between the two disconnected micro energy storage units 201 in the target micro energy storage module 300. In the case of adding multiple micro energy storage units 201, these micro energy storage units 201 can be connected in series first, and then connected in series between the two disconnected micro energy storage units 201, or these micro energy storage units 201 can be connected in series between the two disconnected micro energy storage units 201 one by one.

[0054] Scenario 2: Add one or more micro energy storage modules 300. Connect the newly added micro energy storage modules 300 in series between the two micro energy storage modules 300 of the original micro energy storage device. Specifically, first disconnect the two micro energy storage modules 300 at the extension, and connect the newly added micro energy storage modules 300 between the two disconnected micro energy storage modules 300 according to the principle of connecting the positive DC output terminal with the negative DC output terminal. All newly added micro energy storage modules 300 may be connected in series first, and then connected in series between the two disconnected micro energy storage modules 300, or they may be connected in series one by one.

[0055] In some negative expansion embodiments of removing micro energy storage units 201, at least one micro energy storage unit 201 in the target micro energy storage module 300 is removed, and the micro energy storage units 201 adjacent to the removed positions are connected in series. Although the removal operation is usually performed by removing a series of continuous micro energy storage units 201, it does not exclude the possibility of removing scattered micro energy storage units 201 separately.

[0056] In addition, if the micro energy storage unit 201 is to be replaced (not necessarily an exact replacement, the number of micro energy storage units 201 before and after the replacement may vary), at least one micro energy storage unit 201 in the target micro energy storage module 300 is first disconnected and removed, and then at least one new micro energy storage unit 201 is serially connected between the micro energy storage units 201 adjacent to the removed position.

[0057] If the entire micro energy storage module 300 needs to be removed, the micro energy storage modules 300 adjacent to the removal position can be connected in series.

[0058] The above-mentioned addition, removal and replacement of micro energy storage units 201 may be performed simultaneously in the same micro energy storage device. For example, while replacing some micro energy storage units 201, some micro energy storage units 201 are also added; while removing some micro energy storage units 201, some micro energy storage units 201 are added to other locations, and so on.

[0059] Example 3

[0060] This section of the embodiments introduces the operating method of the expandable micro energy storage device.

[0061] After the micro energy storage device is assembled, it does not start working directly, but starts working under the triggering of the start instruction. In some embodiments, each micro energy storage unit 201 receives instructions through the communication module 202, and starts to start after receiving the first instruction.

[0062] After the micro energy storage device is assembled, the communication module 202 of each micro energy storage unit 201 is in working state. The staff broadcasts the first instruction through the portable control device or remotely through the control center, and each micro energy storage unit 201 starts to start after receiving the first instruction.

[0063] If all micro energy storage units 201 are successfully started, the startup success information will be uniformly reported through the communication module 202. In addition, as a successful startup indication on site, all micro energy storage units 201 uniformly send out an alarm signal to remind the on-site installer that all have been successfully started.

[0064] If there is a misconnection, such as Figure 3 and Figure 4 In the situation shown, when each micro energy storage unit 201 is connected incorrectly with an adjacent micro energy storage unit 201, since each micro energy storage unit 201 can judge the polarity of the connection on the DC input terminal and the DC output terminal to determine whether it is wrongly connected, and due to the reason of the wrong connection of the line, the wrongly connected micro energy storage unit 201 can find that it is wrongly connected, and since each micro energy storage unit 201 is equipped with an alarm, the wrongly connected micro energy storage unit 201 stops working at this time, and sends an alarm signal through the alarm to prompt the on-site installation personnel to change the line when the connection is wrong. Finally, after all the wrongly connected lines are corrected, all micro energy storage units 201 can be successfully started under the action of the first instruction. At this time, as mentioned above, the communication module 202 reports a successful start signal, and the alarm signal is uniformly sent through the alarm.

[0065] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An expandable micro energy storage device, characterized in that: include: At least one micro energy storage module, when there are multiple micro energy storage modules, each micro energy storage module is connected in series in sequence; Each of the micro energy storage modules includes at least one micro energy storage unit. When there are multiple micro energy storage units, the micro energy storage units are connected in series.

2. The expandable micro energy storage device according to claim 1, characterized in that: In any micro energy storage module, the DC input end of the micro energy storage unit is connected to the new energy power generation unit, or connected to the DC output end of the previous micro energy storage unit; the DC output end of the micro energy storage unit is connected to the DC input end of the next micro energy storage unit, or serves as the DC output end of the micro energy storage module to connect to the DC output end of the adjacent micro energy storage module.

3. The expandable micro energy storage device according to claim 2, characterized in that: Each of the micro energy storage units includes a battery pack, a battery management module and a communication module which are connected in sequence, and the communication module is responsible for information exchange between the micro energy storage unit and the outside world.

4. The expandable micro energy storage device according to claim 3, characterized in that: A detection circuit is provided on both the DC input terminal and the DC output terminal of the micro energy storage unit, and the detection circuit is configured to detect the position of the micro energy storage unit in the micro energy storage module.

5. The expandable micro energy storage device according to claim 3, characterized in that: Each of the micro energy storage units further includes a power optimizer and a DC-DC converter, wherein the DC-DC converter is connected to the DC input terminal, and the power optimizer is connected between the DC-DC converter and the battery management module.

6. The expandable micro energy storage device according to any one of claims 3 to 5, characterized in that: Each of the micro energy storage units also includes an alarm, which is connected to the battery management module.

7. The method for expanding the expandable micro energy storage device according to any one of claims 1 to 6, characterized in that: include: One or more micro energy storage units are connected in series between two micro energy storage units of the target micro energy storage module.

8. The method for expanding the expandable micro energy storage device according to claim 7, characterized in that: Also includes: At least one micro energy storage unit in the target micro energy storage module is removed, and micro energy storage units adjacent to the removed positions are connected in series.

9. The method for expanding the expandable micro energy storage device according to claim 7 or 8, characterized in that: Also includes: Removing at least one micro energy storage unit in the target micro energy storage module; At least one new micro energy storage unit is connected in series between the micro energy storage units adjacent to the removed positions.

10. The operating method of the expandable micro energy storage device according to claim 6, characterized in that: include: Each micro energy storage unit receives instructions through the communication module and starts to start after receiving the first instruction; After successfully starting, all micro energy storage units send out an alarm signal through the alarm and report the startup success information through the communication module.

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