Energy storage system

Abstract

The utility model discloses an energy storage system, which belongs to the technical field of energy storage, comprises a power generation unit, a battery unit and a control unit, and is characterized in that the power generation unit comprises an engine and a generator in mechanical transmission connection with the engine; the system further comprises a first inversion unit, the output end of the battery unit is connected with the first inversion unit, and the first inversion unit can convert direct current output by the battery unit into alternating current meeting the parallel operation requirement under the control of the control unit. The system further comprises a parallel operation unit, the output end of the generator and the output end of the first inverter unit are both connected to the parallel operation unit, and the parallel operation unit is used for parallel operation of the output power of the power generation unit and the output power of the battery unit to supply power to electric equipment. And a flexible energy supply mode is provided, the use scene is expanded, and the applicability is greatly enhanced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system. Background Art

[0002] With the rapid development of renewable energy and distributed energy systems, energy storage systems, as key components of energy storage and management, are crucial for improving energy efficiency and stability. However, traditional energy storage systems have significant limitations in power adjustment, system flexibility, and portability, failing to meet the growing demands of diverse applications. Therefore, designing an energy storage system that can efficiently integrate diverse energy outputs, achieve dynamic power adjustment, and offer high flexibility and portability has significant practical significance and promising applications. Summary of the Invention

[0003] The purpose of this utility model is to address the above-mentioned problems in the existing technology and propose an energy storage system. The technical problem to be solved by this utility model is how to provide a more efficient, flexible and reliable energy storage system.

[0004] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0005] An energy storage system includes a power generation unit, a battery unit and a control unit, wherein the power generation unit includes an engine and a generator mechanically connected to the engine;

[0006] The system further includes a first inverter unit, the output end of the battery unit is connected to the first inverter unit, and the first inverter unit can convert the direct current output by the battery unit into alternating current that meets the parallel requirements under the control of the control unit;

[0007] The system further comprises a parallel unit, to which the output end of the generator and the output end of the first inverter unit are both connected, for paralleling the output power of the power generation unit and the battery unit to supply power to electrical equipment.

[0008] During normal operation, the battery unit serves as the primary power source. The control unit outputs a control signal to the first inverter unit, which then converts the DC power output from the battery unit into AC power to power low-power devices. When powering high-power devices, the control unit simultaneously sends a control signal to the first inverter unit and a start signal to the engine. Upon receiving the start signal from the control unit, the engine mechanically activates the generator, causing it to generate electricity.

[0009] Under the control of the control unit, the first inverter unit converts the DC power from the battery cells into AC power that meets the parallel requirements. This power is then combined with the AC power from the generator and fed into the parallel unit through its input. The parallel unit then adjusts the two components of the power to matching frequency, phase, and voltage before paralleling them to achieve integrated power output for powering high-power devices. The parallel unit incorporates a synchronization function to ensure that the parallel devices synchronize in voltage, frequency, and phase to avoid surge currents during parallel operation. This is prior art and will not be described in detail here. This system allows energy storage devices to not only power low-power devices but also boost power to power high-power devices, providing a flexible energy supply method, expanding its application scenarios, and significantly enhancing its applicability.

[0010] In the aforementioned energy storage system, an AC-AC module is connected between the parallel unit and the generator. The introduction of the AC-AC module can regulate the voltage of the alternating current output by the generator to ensure that the power output by the generator is consistent with the voltage converted by the battery unit and to ensure the stability of the power output. This enhances the system's power regulation capabilities, reduces power loss, improves power conversion efficiency, improves the parallel efficiency and stability of the system, and reduces the potential risk of equipment damage.

[0011] In the aforementioned energy storage system, a second inverter unit is connected between the parallel unit and the generator. The second inverter unit is configured to condition the AC power output by the generator to match the AC power converted by the battery unit. This second inverter unit conditions the AC power output by the generator to match the AC power converted by the battery unit, ensuring consistency and compatibility of power output and improving the overall operating efficiency and stability of the system.

[0012] In the aforementioned energy storage system, a rectifier unit is provided between the generator and the battery cells, and a busbar connects the generator and the battery cells. The rectifier unit is provided between the generator and the battery cells, and the busbar connects the two. After the alternating current (AC) generated by the generator is converted into DC by the rectifier unit, it is transmitted to the battery cells for storage. This allows the system to more efficiently utilize the electricity generated by the generator to power the battery cells, thereby improving energy efficiency.

[0013] In one of the aforementioned energy storage systems, when the generator and battery units are operated in parallel, the total output power is continuously adjustable, and the minimum total output power is no less than 30% and no more than 110% of the system's rated power. When operating in parallel, the system's total output power is continuously adjustable, with the minimum power no less than 30% and the maximum power no more than 110% of the system's rated power. This ensures that the system's output power meets minimum demand without exceeding the maximum load, thereby optimizing energy efficiency, avoiding overload or underload, extending equipment life, and ensuring the reliability of power output to meet the needs of different scenarios.

[0014] In the aforementioned energy storage system, when the generator and battery cells operate in parallel, the control unit dynamically adjusts their output power to ensure that the generator's output power is controlled between 40% and 80% of the total power output requirement. The battery cell's output power is used to make up the difference to meet the total power output requirement. This dynamic adjustment mechanism optimizes energy distribution and utilization, reduces energy waste, improves overall system efficiency, and prevents the battery cells from operating under high load for extended periods. This also helps reduce generator wear and extend its service life.

[0015] In the aforementioned energy storage system, the battery unit comprises multiple battery packs connected in series or parallel, and the multiple battery packs are collaboratively controlled by the control unit. The combination of multiple battery packs increases the system's storage capacity, energy storage capabilities, and flexibility, allowing individual battery packs to be maintained or replaced without interrupting power supply.

[0016] In the aforementioned energy storage system, each battery pack can be removed from the system to independently power a device. This expands the system's applicability and provides greater flexibility, practicality, and versatility.

[0017] In the aforementioned energy storage system, the first inverter unit is a bidirectional inverter used to directly power the battery cells from external devices. The first inverter unit adopts a bidirectional design that not only converts the direct current (DC) power of the battery cells into alternating current (AC) but also supports external devices directly powering the battery cells. This provides the system with bidirectional energy conversion capabilities, enhances the system's adaptability, enables external energy reception, and improves the system's energy acquisition flexibility.

[0018] In one of the aforementioned energy storage systems, the system also includes a DC-DC module connected to the battery cells. The control unit controls the DC-DC module to convert the battery cell power and output a DC voltage. The module is capable of converting the battery cell power into a DC voltage to power a specific DC load. The DC-DC module can convert between different DC voltages, allowing the battery cells to power devices requiring specific voltages without the need for an inverter process. This reduces losses during energy conversion, improves energy efficiency, and enhances the system's application scope and practicality.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. By connecting battery units and generators in parallel, the energy storage device can not only supply power to low-power electrical equipment but also increase the power to supply power to high-power electrical equipment, providing a flexible energy supply method, expanding the usage scenarios, and greatly enhancing applicability.

[0021] 2. Each battery pack can be removed from the system and independently power portable electrical devices, which increases the application range of the system and has strong flexibility, practicality and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a connection block diagram of Example 1 of the present utility model.

[0023] Figure 2 This is a connection block diagram of Example 2 of the present utility model.

[0024] Explanation of the accompanying drawings: 1. Power generation unit; 11. Engine; 12. Generator; 2. Battery unit; 21. Battery pack; 3. Control unit; 4. First inverter unit; 5. Parallel unit; 61. AC-AC module; 62. Second inverter unit; 7. Rectifier unit; 8. DC-DC module. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in combination with diagrams and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example

[0026] like Figure 1As shown, an energy storage system includes a power generation unit 1, a battery unit 2, a control unit 3, a first inverter unit 4, an AC-AC module 61 and a parallel unit 5. The power generation unit 1 includes an engine 11 and a generator 12 mechanically connected to the engine 11. The output end of the battery unit 2 is connected to the first inverter unit 4. The first inverter unit 4 can convert the direct current output of the battery unit 2 into alternating current that meets the parallel requirements under the control of the control unit 3. The output end of the generator 12 and the output end of the first inverter unit 4 are both connected to the parallel unit 5, which is used to parallel the output power of the power generation unit 1 and the battery unit 2 to power electrical equipment. The AC-AC module 61 is connected between the parallel unit 5 and the generator 12 to regulate the voltage of the alternating current output by the generator 12. The introduction of the AC-AC module 61 can make the electric energy output by the generator 12 consistent with the voltage converted by the battery unit 2 and ensure the stability of the power output, thereby enhancing the power regulation capability of the system, reducing power loss, improving power conversion efficiency, improving the parallel efficiency and stability of the system, and reducing the potential risk of equipment damage. Parallel unit 5

[0027] When the generator 12 and battery unit 2 operate in parallel, their total output power is continuously adjustable, with the minimum total output power being no less than 30% and no more than 110% of the system's rated power. This ensures that the system's output power meets minimum demand without exceeding the maximum load, thereby optimizing energy efficiency and avoiding overload or underload, extending equipment life. This also ensures reliable power output and meets the needs of various scenarios. Furthermore, in this embodiment, the control unit 3 dynamically adjusts the output power of the generator 12 and battery unit 2, ensuring that the output power of the generator 12 is controlled between 40% and 80% of the total power output demand. The output power of the battery unit 2 is used to supplement the difference, meeting 20% ​​to 60% of the total power output demand. The control unit 3 dynamically adjusts the output power of the generator 12 and battery unit 2. This dynamic adjustment mechanism optimizes energy distribution and utilization, reduces energy waste, improves overall system efficiency, and prevents the battery unit 2 from operating under high load for extended periods. This also helps reduce wear on the generator 12 and extend its service life.

[0028] When the battery unit 2 is low on power, the generator 12 operates as a backup solution to power low-power electrical appliances. In order to further improve the utilization rate of the electric energy output by the generator 12, a rectifier unit 7 is provided between the generator 12 and the battery unit 2, and the generator 12 and the battery unit 2 are connected via a busbar. The alternating current generated by the generator 12 is converted into direct current by the rectifier unit 7 and then transmitted to the battery unit 2 for storage.

[0029] In addition to the above-mentioned solution of providing electrical energy to the battery unit 2 through the generator 12, this embodiment also provides another solution for powering the battery unit 2, that is, using a bidirectional inverter as the first inverter unit 4. The first inverter unit 4 adopts a bidirectional design, which not only converts the DC power of the battery unit 2 into AC power, but also supports external devices to directly power the battery unit 2, so that the system has bidirectional energy conversion capabilities, enhances the system's adaptability, can receive energy from the outside, and improves the system's energy acquisition flexibility.

[0030] The system also includes a DC-DC module 8 connected to the battery unit 2. The control unit 3 controls the DC-DC module 8 to convert the power of the battery unit 2 and output a DC voltage to power a specific DC load. In addition, the battery unit 2 can be reversely charged through an external device without going through an inversion process, thereby reducing the loss in the energy conversion process, improving energy utilization efficiency, and enhancing the application scope and practicality of the system.

[0031] As a preferred solution, the battery unit 2 includes multiple battery packs 21 connected in series or in parallel. Each battery pack 21 can be removed from the energy storage system to independently power a portable electrical device. The multiple battery packs 21 are cooperatively controlled by the control unit 3, which improves the storage capacity of the system and also improves the energy storage capacity and flexibility of the system. The system can maintain or replace a single battery pack 21 without interrupting the power supply. Each battery pack 21 can be removed from the system to independently power a portable electrical device, which can be an electric tool. This improves the application range of the system and has strong flexibility, practicality and versatility.

[0032] During normal operation, the battery unit 2 serves as the main power source, that is, the control unit 3 outputs a control signal to the first inverter unit 4. After receiving the control signal, the first inverter unit 4 converts the DC power output by the battery unit 2 into AC power to power low-power electrical equipment.

[0033] When the battery unit 2 is low on power, the control unit 3 outputs a control signal to the engine 11 to start power generation and use the electric energy generated by the generator 12 to power low-power electrical equipment. At the same time, part of the electric energy generated by the generator 12 is converted into direct current through the rectification unit 7 and stored in the battery unit 2 to charge the battery unit 2.

[0034] When it is necessary to power high-power electrical equipment, the control unit 3 sends a control signal to the first inverter unit 4 and also sends a start signal to the engine 11. After receiving the start signal from the control unit 3, the engine 11 starts the generator 12 through mechanical transmission, so that the generator 12 generates electrical energy and, after voltage regulation and stabilization by the AC-AC module 61, the voltage is kept matched with the voltage of the electrical energy generated by the battery unit 2 after conversion by the first inverter. The DC power of the battery unit 2 is converted into AC power that meets the parallel requirements and the AC power after voltage regulation by the generator 12 both enter the parallel unit 5 from the input end of the parallel unit 5. The parallel unit 5 first adjusts the two parts of electrical energy to matching frequency, phase and voltage, and then performs parallel operation to achieve integrated power output for powering high-power electrical equipment. Example

[0035] Example 2 is basically the same as Example 1, except that Figure 2 As shown, in Example 2, a second inverter unit 62 is connected between the parallel unit 5 and the generator 12. The second inverter unit 62 is used to adjust the AC power output by the generator 12 to match the AC power converted by the battery unit 2. The second inverter unit 62 adjusts the AC power output by the generator 12 to match the AC power converted by the battery unit 2, ensuring the consistency and compatibility of the power output and improving the overall operating efficiency and stability of the system.

[0036] The utility model allows the energy storage device to supply power to low-power electrical equipment and also to increase the power to supply power to high-power electrical equipment, providing a flexible energy supply method, expanding the usage scenarios, greatly enhancing the applicability, overcoming the limitations of existing technologies, and proposing a more efficient, flexible and reliable energy solution.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An energy storage system comprising a power generation unit (1), a battery unit (2) and a control unit (3), characterized in that: The power generation unit (1) includes an engine (11) and a generator (12) mechanically connected to the engine (11); The system further comprises a first inverter unit (4), the output end of the battery unit (2) being connected to the first inverter unit (4), and the first inverter unit (4) being capable of converting the direct current outputted by the battery unit (2) into alternating current meeting the parallel connection requirements under the control of the control unit (3); The system further comprises a parallel unit (5), to which the output end of the generator (12) and the output end of the first inverter unit (4) are both connected, and is used to parallelize the output power of the power generation unit (1) and the battery unit (2) to supply power to the electrical equipment.

2. An energy storage system according to claim 1, characterized in that: An AC-AC module (61) is connected between the parallel unit (5) and the generator (12).

3. The energy storage system according to claim 1, characterized in that: A second inverter unit (62) is connected between the parallel unit (5) and the generator (12), and the second inverter unit (62) is used to adjust the alternating current output by the generator (12) so that it matches the alternating current converted by the battery unit (2).

4. An energy storage system according to claim 2 or 3, characterized in that: A rectifier unit (7) is provided between the generator (12) and the battery unit (2), and the generator (12) is connected to the battery unit (2) via a busbar.

5. An energy storage system according to claim 4, characterized in that: When the generator (12) and the battery unit (2) are operated in parallel, the total output power is continuously adjustable and the minimum power of the total output power is not less than 30% of the system rated power and not more than 110% of the system rated power.

6. An energy storage system according to claim 5, characterized in that: When the generator (12) and the battery unit (2) are operated in parallel, the output power of the generator (12) and the battery unit (2) is dynamically adjusted by the control unit (3) to ensure that the output power of the generator (12) is controlled between 40% and 80% of the total power output requirement, and the output power of the battery unit (2) is used to supplement the difference to meet the total power output requirement.

7. The energy storage system according to claim 4, characterized in that: The battery unit (2) comprises a plurality of battery packs (21) connected in series or in parallel, and the plurality of battery packs (21) are cooperatively controlled by the control unit (3).

8. An energy storage system according to claim 7, characterized in that: Each of the battery packs (21) can be removed from the energy storage system and used to independently supply power to electrical equipment.

9. An energy storage system according to claim 8, characterized in that: The first inverter unit (4) is a bidirectional inverter used for external equipment to directly supply power to the battery unit (2).

10. An energy storage system according to claim 9, characterized in that: The system further comprises a DC-DC module (8), and the control unit (3) controls the DC-DC module (8) to convert the power of the battery unit (2) and output a DC voltage.

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