Energy storage system and energy storage device

Abstract

The utility model is suitable for the technical field of energy storage, and provides an energy storage system and an energy storage device.The energy storage system comprises a control module, a photovoltaic module, a switch module, an energy storage module, a power grid module and a load port, the photovoltaic module is electrically connected with the load port through the switch module, and the power grid module and the energy storage module are both electrically connected with the load port. The control module is electrically connected with the energy storage module, the switch module and the power grid module. When the electric energy stored by the energy storage module is larger than a preset value, the control module controls the switch module to be switched off to prevent the electric energy output by the photovoltaic module from flowing into the energy storage module to damage the energy storage module. Therefore, according to the energy storage system provided by the embodiment of the invention, the photovoltaic module can be arranged on the load port side, and the application flexibility of the energy storage system is improved.

Description

Technical Field

[0001] This application belongs to the field of energy storage technology, and in particular relates to an energy storage system and energy storage device. Background Technology

[0002] With increasing attention and demand for renewable energy sources such as solar and wind power, commercial and industrial energy storage systems are becoming particularly important in remote or unreliable power supply areas. These systems can handle peak grid demand by charging during off-peak hours and discharging during peak hours, avoiding high electricity bills, and serve as backup power during grid failures or outages. To better utilize solar energy, many users add photovoltaic inverters to their commercial and industrial energy storage systems; however, it is crucial to ensure that these two strategies work in tandem to maintain the system's stable and reliable operation. In existing energy storage systems, photovoltaic modules can only be installed on the grid input side, not on the AC load side, resulting in poor application flexibility. Utility Model Content

[0003] This application provides an energy storage system and energy storage device, which can solve the problem that photovoltaic power generation modules in existing energy storage systems can only be installed on the grid input side of the energy storage system and cannot be installed on the AC load side of the energy storage system, resulting in poor application flexibility of the energy storage system.

[0004] In a first aspect, embodiments of this application provide an energy storage system, including a control module, a photovoltaic module, a switch module, an energy storage module, a grid module, and a load port. The photovoltaic module is electrically connected to the load port through the switch module. The grid module and the energy storage module are both electrically connected to the load port. The control module is electrically connected to the energy storage module, the switch module, and the grid module, respectively.

[0005] In one possible implementation of the first aspect, the switching module includes a first switching unit connected in series between the photovoltaic module and the load port, and the control terminal of the first switching unit is electrically connected to the control module.

[0006] In one possible implementation of the first aspect, the switching module includes a second switching unit and a third switching unit. The second switching unit is connected in series between the photovoltaic module and the load port. The first control terminal of the second switching unit is grounded. The second control terminal of the second switching unit is electrically connected to the first terminal of the third switching unit. The second terminal of the third switching unit is electrically connected to a power port in the load port. The control terminal of the third switching unit is electrically connected to the control module.

[0007] In one possible implementation of the first aspect, the power grid module includes a fourth switch unit, a fifth switch unit, and a power grid port. The power grid port is electrically connected to the load port through the fourth switch unit, and the power grid port is electrically connected to the energy storage module through the fifth switch unit. The control terminals of the fourth switch unit and the fifth switch unit are both electrically connected to the control module.

[0008] In one possible implementation of the first aspect, the photovoltaic module includes a photovoltaic panel and a photovoltaic inverter, wherein the photovoltaic panel is electrically connected to the switching module via the photovoltaic inverter.

[0009] In one possible implementation of the first aspect, the energy storage module includes an energy storage battery, a voltage conversion unit, and a sixth switching unit. The energy storage battery is electrically connected to the voltage conversion unit, the voltage conversion unit is electrically connected to the power grid module and the sixth switching unit, the sixth switching unit is connected in series between the voltage conversion unit and the load port, and the control terminal of the sixth switching unit is electrically connected to the control module.

[0010] In one possible implementation of the first aspect, the energy storage module further includes a protection unit, one end of which is grounded and the other end of which is disposed between the sixth switching unit and the voltage conversion unit.

[0011] In one possible implementation of the first aspect, the energy storage system further includes a power generation module, which is electrically connected to both the energy storage module and the control module.

[0012] In one possible implementation of the first aspect, the power generation module includes a power generation port and a seventh switching unit, the seventh switching unit being connected in series between the power generation port and the energy storage module, and the control terminal of the seventh switching unit being electrically connected to the control module.

[0013] Secondly, embodiments of this application provide an energy storage device, including the energy storage system described in any one of the first aspects.

[0014] The beneficial effects of the embodiments in this application compared with the prior art are:

[0015] This application provides an energy storage system, including a control module, a photovoltaic module, a switch module, an energy storage module, a grid module, and a load port. The photovoltaic module is electrically connected to the load port through the switch module, and both the grid module and the energy storage module are electrically connected to the load port. The control module is electrically connected to the energy storage module, the switch module, and the grid module.

[0016] In operation, the energy storage system connects the load port to the load and the grid module to the power grid. The control module can control the grid module to operate, enabling the grid to supply power to the load and also to provide power to the energy storage module for energy storage. The control module can also control the switching module to enable the photovoltaic module to supply power to the load and the photovoltaic module to provide power to the energy storage module for energy storage. When the stored energy in the energy storage module exceeds a preset value, the control module controls the switching module to disconnect, preventing the photovoltaic module's output energy from flowing into the energy storage module and causing damage. Therefore, the design of this energy storage system allows the photovoltaic module to be placed on the load port side, improving the flexibility of the energy storage system application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, 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.

[0018] Figure 1 This is a schematic diagram of an energy storage system provided in one embodiment of this application;

[0019] Figure 2 This is a connection diagram of an energy storage system provided in an embodiment of this application;

[0020] Figure 3 This is a connection diagram of an energy storage system provided in another embodiment of this application;

[0021] Figure 4 This is a connection diagram of an energy storage system provided in another embodiment of this application.

[0022] In the diagram: 10, Control Module; 20, Photovoltaic Module; 201, Photovoltaic Panel; 202, Photovoltaic Inverter; 30, Switching Module; 301, First Switching Unit; 302, Second Switching Unit; 303, Third Switching Unit; 40, Energy Storage Module; 401, Energy Storage Battery; 402, Voltage Conversion Unit; 403, Sixth Switching Unit; 404, Protection Unit; 50, Grid Module; 501, Fourth Switching Unit; 502, Fifth Switching Unit; 503, Grid Port; 60, Load Port; 70, Power Generation Module; 701, Power Generation Port; 702, Seventh Switching Unit. Detailed Implementation

[0023] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0024] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0025] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0026] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0028] In existing energy storage systems, photovoltaic (PV) modules can only be installed on the grid input side. If the PV modules are installed on the load side, the electricity generated by the PV modules will flow back into the batteries of the energy storage system, potentially causing battery malfunctions over time and affecting the overall reliability of the system. For these reasons, PV modules cannot be installed on the load side in existing energy storage systems.

[0029] To address the aforementioned problems, this application provides an energy storage system, such as... Figure 1 As shown, the energy storage system includes a control module 10, a photovoltaic module 20, a switch module 30, an energy storage module 40, a grid module 50, and a load port 60. The photovoltaic module 20 is electrically connected to the load port 60 through the switch module 30. The grid module 50 and the energy storage module 40 are both electrically connected to the load port 60. The control module 10 is electrically connected to the energy storage module 40, the switch module 30, and the grid module 50, respectively.

[0030] Specifically, when the energy storage system is in use, the load port 60 is electrically connected to the load, and the grid module 50 is electrically connected to the grid.

[0031] The control module 10 can control the operation of the power grid module 50, enabling the power grid to supply power to the load, and can also enable the power grid to provide power to the energy storage module 40, so that the energy storage module 40 can store energy.

[0032] The control module 10 can also control the switching module 30 to turn on, enabling the photovoltaic module 20 to supply power to the load, and also enabling the photovoltaic module 20 to provide power to the energy storage module 40, allowing the energy storage module 40 to store energy. When the energy stored in the energy storage module 40 exceeds a preset value, the control module 10 controls the switching module 30 to turn off, preventing the power output from the photovoltaic module 20 from flowing into the energy storage module 40 and causing damage to the energy storage module 40. Therefore, through the design of the energy storage system of this application, the photovoltaic module 20 can be placed on the load port 60 side, improving the flexibility of the energy storage system application.

[0033] In some embodiments, such as Figure 2 As shown, the switch module 30 includes a first switch unit 301, which is connected in series between the photovoltaic module 20 and the load port 60. The control terminal of the first switch unit 301 is electrically connected to the control module 10.

[0034] Specifically, when the control module 10 controls the first switching unit 301 to conduct, the photovoltaic module 20 is connected to the load port 60 and the energy storage module 40. At this time, the electrical energy generated by the photovoltaic module 20 can supply power to the load through the load port 60, and at the same time, the electrical energy generated by the photovoltaic module 20 can flow into the energy storage module 40, allowing the energy storage module 40 to store energy. When the electrical energy stored in the energy storage module 40 exceeds a preset value, the control module 10 controls the first switching unit 301 to disconnect, preventing the electrical energy output by the photovoltaic module 20 from continuing to flow into the energy storage module 40, which could damage the energy storage module 40.

[0035] The control module 10 can determine whether the energy storage module 40's energy is greater than a preset value by collecting the current energy level of the energy storage module 40 or the voltage of the individual cells in the energy storage module 40. For example, when the current energy level of the energy storage module 40 is greater than or equal to 95% or the highest voltage of the individual cells in the energy storage module 40 is greater than or equal to 3.55V, it is determined that the energy storage module 40's energy is greater than the preset value. When the current energy level of the energy storage module 40 is less than or equal to 90% or the highest voltage of the individual cells in the energy storage module 40 is less than or equal to 3.35V, it is determined that the energy storage module 40's energy is less than the preset value.

[0036] For example, the first switch unit 301 may be a first relay KM1. The control terminal of the first relay KM1 is electrically connected to the control module 10. The first relay KM1 is connected in series between the photovoltaic module 20 and the load port 60.

[0037] In some embodiments, such as Figure 3 As shown, the switch module 30 includes a second switch unit 302 and a third switch unit 303. The second switch unit 302 is connected in series between the photovoltaic module 20 and the load port 60. The first control terminal of the second switch unit 302 is grounded. The second control terminal of the second switch unit 302 is electrically connected to the first terminal of the third switch unit 303. The second terminal of the third switch unit 303 is electrically connected to one of the power ports in the load port 60. The control terminal of the third switch unit 303 is electrically connected to the control module 10.

[0038] Specifically, when the control module 10 controls the third switch unit 303 to conduct, the first and second terminals of the third switch unit 303 are connected. At this time, the control terminal of the second switch unit 302 is powered on, and the second switch unit 302 is connected. The photovoltaic module 20 is connected to the load port 60 and the energy storage module 40. At this time, the electrical energy generated by the photovoltaic module 20 can supply power to the load through the load port 60. Simultaneously, the electrical energy generated by the photovoltaic module 20 can flow into the energy storage module 40, enabling the energy storage module 40 to store energy. When the electrical energy stored in the energy storage module 40 exceeds a preset value, the control module 10 controls the third switch unit 303 to disconnect. The first and second terminals of the third switch unit 303 are no longer connected. At this time, the control terminal of the second switch unit 302 cannot be powered on, and the second switch unit 302 is in an open state to prevent the electrical energy output by the photovoltaic module 20 from continuing to flow into the energy storage module 40, which could damage the energy storage module 40.

[0039] Since the operating voltage and current of the control module 10 are relatively small, while the voltage and current between the photovoltaic module 20 and the load port 60 are relatively large, two switching units (the second switching unit 302 and the third switching unit 303) are used. The second switching unit 302 is connected in series between the photovoltaic module 20 and the load port 60, and the third switching unit 303 is connected to the control terminal of the second switching unit 302. The control module 10 is connected to the control terminal of the third switching unit 303 to achieve isolation between strong and weak currents, thereby better protecting the control module 10.

[0040] For example, the second switching unit 302 may be selected as the second relay KM2, and the third switching unit 303 may be selected as the third relay KM3.

[0041] In some embodiments, such as Figure 2 and Figure 3 As shown, the power grid module 50 includes a fourth switch unit 501, a fifth switch unit 502, and a power grid port 503. The power grid port 503 is electrically connected to the load port 60 through the fourth switch unit 501, and the power grid port 503 is electrically connected to the energy storage module 40 through the fifth switch unit 502. The control terminals of the fourth switch unit 501 and the fifth switch unit 502 are both electrically connected to the control module 10.

[0042] Specifically, when using the energy storage system, the grid port 503 is connected to the power grid. When the control module 10 controls the fourth switch unit 501 to conduct and the fifth switch unit 502 to conduct, the grid port 503 is connected to the load port 60 and disconnected from the energy storage module 40. At this time, the power grid supplies power to the load but does not supply power to the energy storage module 40. When the control module 10 controls the fourth switch to conduct and the fifth switch to conduct, the grid port 503 is disconnected from the load port 60 and connected to the energy storage module 40. At this time, the power grid does not supply power to the load but supplies power to the energy storage module 40, allowing the module to store energy. When the control module 10 controls both the fourth switch unit 501 and the fifth switch unit 502 to conduct simultaneously, the power grid supplies power to the load and simultaneously supplies power to the energy storage module 40, enabling the energy storage module 40 to store energy.

[0043] For example, the fourth switch unit 501 can be selected as circuit breaker QF2, and the fifth switch unit 502 can be selected as circuit breaker QF3.

[0044] In some embodiments, such as Figure 2 and Figure 3 As shown, the photovoltaic module 20 includes a photovoltaic panel 201 and a photovoltaic inverter 202. The photovoltaic panel 201 is electrically connected to the switch module 30 through the photovoltaic inverter 202.

[0045] Specifically, when sunlight shines on the photovoltaic panel 201, the photovoltaic panel 201 generates electricity. The electricity generated by the photovoltaic panel 201 is converted by the photovoltaic inverter 202. The electrical energy output by the photovoltaic inverter 202 can supply power to the load through the switching module 30, and can also provide electrical energy to the energy storage module 40, enabling the energy storage module 40 to store energy.

[0046] In some embodiments, such as Figure 2 and Figure 3 As shown, the energy storage module 40 includes an energy storage battery 401, a voltage conversion unit 402, and a sixth switch unit 403. The energy storage battery 401 is electrically connected to the voltage conversion unit 402. The voltage conversion unit 402 is electrically connected to the grid module 50 and the sixth switch unit 403 respectively. The sixth switch unit 403 is connected in series between the voltage conversion unit 402 and the load port 60. The control terminal of the sixth switch unit 403 is electrically connected to the control module 10.

[0047] Specifically, when the grid module 50 provides power to the energy storage module 40, the voltage conversion unit 402 transforms the power output from the grid module 50 and inputs the transformed power to the energy storage battery 401 for energy storage. When the photovoltaic module 20 provides power to the energy storage module 40, the control module 10 controls the sixth switching unit 403 and the switching module 30 to conduct. The power output from the photovoltaic module 20 reaches the voltage conversion unit 402 through the switching module 30 and the sixth switching unit 403. The voltage conversion unit 402 transforms the power output from the photovoltaic module 20 and inputs the transformed power to the energy storage battery 401 for energy storage. When the energy storage module 40 supplies power to the load, the control module 10 controls the sixth switch unit 403 to turn on, the energy storage battery 401 releases electrical energy, the voltage conversion unit 402 transforms the electrical energy released by the energy storage battery 401, and the transformed electrical energy is delivered to the load through the sixth switch unit 403 and the load port 60 to supply power to the load.

[0048] For example, the sixth switching unit 403 can be a circuit breaker QF1. The voltage conversion unit 402 can be a bidirectional inverter (PCS1 and PCS2). When the energy storage battery 401 is charging, the bidirectional inverter (PCS1) can convert the input AC power into DC power to charge the energy storage battery 401. When the energy storage battery 401 is discharging, the bidirectional inverter (PCS2) can convert the DC power released by the energy storage battery 401 into AC power to supply AC loads.

[0049] In some embodiments, such as Figure 2 and Figure 3As shown, the energy storage module 40 also includes a protection unit 404. One end of the protection unit 404 is grounded, and the other end of the protection unit 404 is disposed between the sixth switching unit 403 and the voltage conversion unit 402.

[0050] Specifically, when the energy storage module 40 is in a discharging or charging state, if the current between the sixth switching unit 403 and the voltage conversion unit 402 is too large, or if the current on the branch of the energy storage battery 401 is too large, the protection unit 404 will short-circuit, grounding the wiring harness between the sixth switching unit 403 and the voltage conversion unit 402, thus protecting the energy storage battery 401.

[0051] In some embodiments, the energy storage module 40 further includes a transformer TV, which is connected in series between the voltage conversion unit 402 and the sixth switching unit 403 to transform the input voltage and output the transformed voltage. Simultaneously, the transformer TV can achieve electrical isolation between the power grid and the voltage conversion unit 402, improving the safety and reliability of the energy storage system.

[0052] In some embodiments, such as Figure 4 As shown, the energy storage system also includes a power generation module 70, which is electrically connected to the energy storage module 40 and the control module 10.

[0053] Specifically, when the energy storage system is in use, the power generation module 70 is connected to the power generation device, which can be a diesel generator, a gasoline generator, or other types of generators; the specific type of generator is not limited here. When it is necessary to use the power generation device to generate electricity for energy storage module 40, the control module 10 can control the operation of the power generation module 70, so that the electrical energy generated by the power generation device is transmitted to the energy storage module 40 through the power generation module 70, enabling the energy storage module 40 to store energy.

[0054] For example, the power generation module 70 includes a power generation port 701 and a seventh switch unit 702. The seventh switch unit 702 is connected in series between the power generation port 701 and the energy storage module 40, and the control terminal of the seventh switch unit 702 is electrically connected to the control module 10.

[0055] Specifically, after the power generation port 701 is connected to the power generation device, the control module 10 can control the seventh switch unit 702 to conduct, so that the power generation device and the energy storage module 40 are connected. The electrical energy generated by the power generation device is transmitted to the energy storage module 40 through the seventh switch unit 702, so that the energy storage module 40 can store energy.

[0056] This application also provides an energy storage device, including the energy storage system described above. When the electrical energy stored in the energy storage module exceeds a preset value, the control module controls the switch module to disconnect, preventing electrical energy output from the photovoltaic module from flowing into the energy storage module and causing damage. Therefore, the photovoltaic module can be placed on the load port side, improving the flexibility of the energy storage system application. The specific working principle of the energy storage system is described above and will not be repeated here.

[0057] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An energy storage system, characterized in that, It includes a control module, a photovoltaic module, a switch module, an energy storage module, a grid module, and a load port. The photovoltaic module is electrically connected to the load port through the switch module. The grid module and the energy storage module are both electrically connected to the load port. The control module is electrically connected to the energy storage module, the switch module, and the grid module respectively. The switching module includes a first switching unit connected in series between the photovoltaic module and the load port, and the control terminal of the first switching unit is electrically connected to the control module; or, the switching module includes a second switching unit and a third switching unit, the second switching unit connected in series between the photovoltaic module and the load port, the first control terminal of the second switching unit being grounded, the second control terminal of the second switching unit being electrically connected to the first terminal of the third switching unit, the second terminal of the third switching unit being electrically connected to a power port in the load port, and the control terminal of the third switching unit being electrically connected to the control module; The power grid module includes a fourth switch unit, a fifth switch unit, and a power grid port. The power grid port is electrically connected to the load port through the fourth switch unit, and the power grid port is electrically connected to the energy storage module through the fifth switch unit. The control terminals of the fourth switch unit and the fifth switch unit are both electrically connected to the control module. The energy storage module includes an energy storage battery, a voltage conversion unit, and a sixth switching unit. The energy storage battery is electrically connected to the voltage conversion unit. The voltage conversion unit is electrically connected to both the power grid module and the sixth switching unit. The sixth switching unit is connected in series between the voltage conversion unit and the load port. The control terminal of the sixth switching unit is electrically connected to the control module.

2. The energy storage system according to claim 1, characterized in that, The photovoltaic module includes a photovoltaic panel and a photovoltaic inverter, and the photovoltaic panel is electrically connected to the switching module through the photovoltaic inverter.

3. The energy storage system according to claim 1, characterized in that, The energy storage module also includes a protection unit, one end of which is grounded and the other end of which is located between the sixth switching unit and the voltage conversion unit.

4. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system also includes a power generation module, which is electrically connected to both the energy storage module and the control module.

5. The energy storage system according to claim 4, characterized in that, The power generation module includes a power generation port and a seventh switch unit. The seventh switch unit is connected in series between the power generation port and the energy storage module, and the control terminal of the seventh switch unit is electrically connected to the control module.

6. An energy storage device, characterized in that, Includes the energy storage system described in any one of claims 1-5.

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