Energy storage circuit, energy storage system and electronic device

Abstract

Provided in the present application are an energy storage circuit, an energy storage system and an electronic device. The circuit comprises: N energy generation modules, N first direct current / direct current converters, N path units and a first controller, wherein N is an integer greater than or equal to 2; the energy generation modules are electrically connected to an energy storage element by means of corresponding first direct current / direct current converters and corresponding path units; and the first controller is electrically connected to the first direct current / direct current converters and the path units. The first controller is used for controlling, when the path units are turned on, the energy generation modules to charge the energy storage element by means of the corresponding first direct current / direct current converters and the corresponding path units, or the energy storage element to output electric energy by means of the corresponding path units; and controlling, when the path units are turned off, the energy generation modules to output electric energy by means of the corresponding first direct current / direct current converters. The circuit in the present application improves the discharge efficiency of an energy storage element, and enriches the operating modes of the energy storage circuit, thereby meeting the operating requirements of different scenarios.

Description

Energy storage circuits, energy storage systems and electronic devices

[0001] This application claims priority to Chinese Patent Application No. 202421845121.1, filed on July 31, 2024, entitled "Energy Storage Circuit, Energy Storage System and Electronic Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to photovoltaic energy storage technology, and more particularly to an energy storage circuit, energy storage system and electronic equipment. Background Technology

[0003] With the continuous development of photovoltaic technology, photovoltaic power generation is being used more and more widely. Taking the micro balcony energy storage scenario as an example, the micro inverter can convert the DC voltage generated by the photovoltaic module into AC power for users. However, the power generated by the photovoltaic module is affected by factors such as weather and light intensity, resulting in large fluctuations in power and difficulty in maintaining stable output, leading to a poor user experience.

[0004] Currently, based on existing microinverters, a first DC / DC converter is added to store the electrical energy generated by the photovoltaic modules in the battery module. When needed, the energy from the battery module is then supplied to the microinverter for user use, improving the stability of the power output. However, the above circuit supports limited operating modes, such as charging / discharging or direct output, which is not flexible enough to meet the actual needs of users. Summary of the Invention

[0005] This application provides an energy storage circuit, an energy storage system, and an electronic device to solve the problem that the working mode of the energy storage circuit is not flexible enough and cannot meet the actual needs of users.

[0006] In a first aspect, this application provides an energy storage circuit (100), comprising: N power generation modules (170), N first DC / DC converters (110), N path units (130), and a first controller (160); wherein N is an integer greater than or equal to 2;

[0007] The capacity module (170) is electrically connected to the energy storage element through the corresponding first DC / DC converter (110) and the corresponding path unit (130); the first controller (160) is electrically connected to the first DC / DC converter (110) and the path unit (130);

[0008] The first controller (160) is configured to control the energy storage module (170) to charge the energy storage element through the corresponding first DC / DC converter (110) and the corresponding path unit (130) when the path unit (130) is turned on, or the energy storage element to output electrical energy through the corresponding path unit (130); and the energy storage module (170) to output electrical energy through the corresponding first DC / DC converter (110) when the path unit (130) is turned off.

[0009] Optionally, the path unit (130) includes: at least one first switch (131); the at least one first switch (131) is connected in series to form a series structure, one end of the series structure is electrically connected to the corresponding first DC / DC converter (110), and the other end of the series structure is electrically connected to the energy storage element.

[0010] Optionally, the first DC / DC converter (110) includes: a plurality of first DC / DC conversion units (111);

[0011] The multiple DC / DC conversion units (111) are connected in parallel.

[0012] Optionally, the energy storage circuit (100) further includes: N first output terminals (181) and second output terminals (182);

[0013] The positive output terminal of the first DC / DC converter (110) is electrically connected to the corresponding first output terminal (181);

[0014] The negative output terminal of the first DC / DC converter (110) is electrically connected to the second output terminal (182).

[0015] Optionally, the first DC / DC converter (110) includes: a second switch (113), a third switch (114), an inductor (115), a first capacitor (116), a second capacitor (117), a fourth switch (118), and a fifth switch (119);

[0016] One end of the second switch (113) is electrically connected to the positive input terminal of the first DC / DC converter (110);

[0017] One end of the third switch (114) is electrically connected to the positive output terminal of the first DC / DC converter (110);

[0018] One end of the inductor (115) is electrically connected to the other end of the second switch (113), and the other end of the inductor (115) is electrically connected to the other end of the third switch (114);

[0019] One end of the first capacitor (116) is electrically connected to the positive input terminal of the first DC / DC converter (110), and the other end of the first capacitor (116) is electrically connected to the negative input terminal of the first DC / DC converter (110).

[0020] One end of the second capacitor (117) is electrically connected to the positive output terminal of the first DC / DC converter (110), and the other end of the second capacitor (117) is electrically connected to the negative output terminal of the first DC / DC converter (110).

[0021] One end of the fourth switch (118) is electrically connected to one end of the inductor (115), and the other end of the fourth switch (118) is electrically connected to the negative input terminal of the first DC / DC converter (110).

[0022] One end of the fifth switch (119) is electrically connected to the other end of the inductor (115), and the other end of the fifth switch (119) is electrically connected to the other end of the fourth switch (118) and the negative output terminal of the first DC / DC converter (110).

[0023] Optionally, when the energy storage circuit (100) is in charging mode, all channels where the path unit (130) is located are in charging mode; when the channel where the path unit (130) is located is in charging mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160).

[0024] Optionally, when the energy storage circuit (100) is in discharge mode, all channels where the path unit (130) is located are in discharge mode; when the channel where the path unit (130) is located is in discharge mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118) and the fifth switch (119) are all continuously turned off.

[0025] Optionally, when the energy storage circuit (100) is in the through mode, all channels where the path unit (130) is located are in the through mode; when the channel where the path unit (130) is located is in the through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously connected, and the fourth switch (118) and the fifth switch (119) are continuously disconnected.

[0026] Optionally, when the energy storage circuit (100) is in the channel-in-channel mixing mode, all channels where the path unit (130) is located are in the channel-in-channel mixing mode; when the channel where the path unit (130) is located is in the channel-in-channel mixing mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160).

[0027] Optionally, when the energy storage circuit (100) is in an inter-channel mixing mode, at least two channels have different current modes; wherein, the channel modes include charging mode, intra-channel mixing mode, discharging mode and pass-through mode;

[0028] When the channel where the path unit (130) is located is in charging mode / in-channel mixed mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160);

[0029] When the channel where the path unit (130) is located is in discharge mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118) and the fifth switch (119) are all continuously turned off;

[0030] When the channel where the path unit (130) is located is in the through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously connected, and the fourth switch (118) and the fifth switch (119) are continuously disconnected.

[0031] Optionally, the first controller (160) includes:

[0032] A first sampling unit (162) is electrically connected to at least one of the first DC / DC converter (110), the path unit (130), and the energy storage element; the first sampling unit (162) is used to sample and obtain a first electrical parameter; the first electrical parameter includes at least one of the following: voltage, current, temperature, and smoke.

[0033] A first control unit (163) is electrically connected to the first sampling unit (162); the first control unit (163) is used to execute a control strategy according to the first electrical parameters to output a first control signal;

[0034] The first driving unit (161) is electrically connected to the first control unit (163), the first DC / DC converter (110), and the path unit (130). The first driving unit (161) is used to perform level conversion on the first control signal output by the first control unit (163) to drive the first DC / DC converter (110) to work, and to drive the path unit (130) to be turned on or off.

[0035] In a second aspect, this application provides an energy storage system, comprising: an energy storage circuit (100) as described in any one of claims 1 to 6 and an inverter (200);

[0036] The energy storage circuit (100) is electrically connected to the inverter (200);

[0037] The output terminal of the inverter (200) is used to connect to the load, and the inverter (200) is used to convert the DC power output by the energy storage circuit (100) into AC power.

[0038] Optionally, the inverter (200) includes: N second DC / DC converters (210), DC / AC converters (230), and a second controller (240);

[0039] The positive input terminal of the second DC / DC converter (210) is electrically connected to the corresponding first output terminal (181) of the energy storage circuit (100); the negative input terminal of the second DC / DC converter (210) is electrically connected to the second output terminal (182) of the energy storage circuit (100); the output terminal of the second DC / DC converter (210) is electrically connected to the DC / AC converter (230); the output terminal of the DC / AC converter (230) is used to connect a load.

[0040] The second controller (240) is electrically connected to the second DC / DC converter (210) and the DC / AC converter (230) and is used to control the operation of the second DC / DC converter (210) and the DC / AC converter (230).

[0041] Optionally, the second controller (240) includes:

[0042] A second sampling unit (242) is electrically connected to at least one of the second DC / DC converter (210) and the DC / AC converter (230); the second sampling unit (242) is used to sample and obtain a second electrical parameter; the second electrical parameter includes at least one of the following: voltage, current, temperature, and smoke.

[0043] The second control unit (244) is electrically connected to the second sampling unit (242); the second control unit (244) is used to execute a control strategy according to the second electrical parameters to output a second control signal;

[0044] The second drive unit (241) is electrically connected to the second control unit (244), the second DC / DC converter (210), and the DC / AC converter (230). The second drive unit (241) is used to perform level conversion on the second control signal output by the second control unit (244) to drive the second DC / DC converter (210) and / or the DC / AC converter (230) to work.

[0045] Optionally, the first controller (160) further includes a first communication unit (164); the second controller (240) further includes a second communication unit (243); the first controller (160) and the second controller (240) establish a communication connection through the first communication unit (164) and the second communication unit (243) so that the first controller (160) can perform power control and / or status monitoring on the inverter (200).

[0046] Thirdly, this application provides an electronic device, including: an energy storage element, and an energy storage system as described in any of the second aspects.

[0047] The energy storage circuit, energy storage system, and electronic device provided in this application, by setting an independent path unit between the first DC / DC converter and the energy storage element, allow the first DC / DC converter to store the electrical energy generated by the power generation module into the energy storage element when the energy storage element needs to be charged or discharged. The energy storage element can also directly output the stored electrical energy through the corresponding path unit without going through the converter, thereby improving the discharge efficiency of the energy storage element. Since the path units between the first DC / DC converter and the energy storage element are set independently, different branches can operate in different modes. When the energy storage element turns off its charging and discharging function, the electrical energy generated by the power generation module can be directly output, thereby ensuring the efficiency of electrical energy utilization, enriching the working modes of the energy storage circuit, improving the flexibility of circuit operation, and meeting the working needs of different scenarios. Attached Figure Description

[0048] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0049] Figure 1 is a schematic diagram of a micro energy storage system;

[0050] Figure 2 is a schematic diagram of another micro energy storage system;

[0051] Figure 3 is a schematic diagram of an energy storage circuit provided in an embodiment of this application;

[0052] Figure 4 is a schematic diagram of another energy storage circuit provided in an embodiment of this application;

[0053] Figure 5 is a schematic diagram of the third type of energy storage circuit provided in the embodiment of this application;

[0054] Figure 6 is a schematic diagram of an energy storage system provided in an embodiment of this application;

[0055] Figure 7 is a schematic diagram of another energy storage system provided in an embodiment of this application;

[0056] Figure 8 is a schematic diagram of the first energy storage circuit operating mode provided in the embodiment of this application;

[0057] Figure 9 is a schematic diagram of the second energy storage circuit operating mode provided in the embodiment of this application;

[0058] Figure 10 is a schematic diagram of the third energy storage circuit operating mode provided in the embodiment of this application;

[0059] Figure 11 is a schematic diagram of the fourth energy storage circuit operating mode provided in the embodiment of this application;

[0060] Figure 12 is a schematic diagram of the fifth energy storage circuit operating mode provided in the embodiment of this application;

[0061] Figure 13 is a schematic diagram of the sixth energy storage circuit operating mode provided in the embodiments of this application.

[0062] Explanation of reference numerals in the attached figures: 100: Energy storage circuit; 110: First DC / DC converter; 1101: First DC / DC converter 1; 1102: First DC / DC converter 2; 111: First DC / DC conversion unit; 113: Second switch; 114: Third switch; 115: Inductor; 116: First capacitor; 117: Second capacitor; 118: Fourth switch; 119: Fifth switch; 130: Path unit; 1301: Path unit 1; 1302: Path unit 2; 131: First switch; 160: First controller; 161: First drive unit; 162: First sampling unit; 163: First control unit; 164: First pass Communication unit; 170: Production capacity module; 1701: Photovoltaic module 1; 1702: Photovoltaic module 2; 181: First output terminal; 182: Second output terminal; 200: Inverter; 210: Second DC / DC converter; 2101: Second DC / DC converter 1; 2102: Second DC / DC converter 2; 230: DC / AC converter; 240: Second controller; 241: Second drive unit; 242: Second sampling unit; 243: Second communication unit; 244: Second control unit.

[0063] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0064] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0065] With the continuous development of photovoltaic technology, photovoltaic power generation is being used more and more widely. Taking the micro balcony energy storage scenario as an example, the micro inverter can convert the DC power generated by the photovoltaic module into AC power for users. However, the power generated by the photovoltaic module is affected by factors such as weather and light intensity, resulting in large fluctuations in power and difficulty in maintaining stable output, leading to a poor user experience.

[0066] Figure 1 is a schematic diagram of a micro energy storage system. As shown in Figure 1, in an application scenario with two photovoltaic modules, when charging is required, the first DC / DC converter 1 and the first DC / DC converter 2 convert the DC power generated by photovoltaic module 1 and photovoltaic module 2 into voltages respectively. When the charge / discharge switch unit is turned on, the electrical energy generated by the photovoltaic modules is stored in the battery module. When power is needed, the electrical energy stored in the battery module can be provided to the user through the turned-on charge / discharge switch unit, or it can be output by the photovoltaic modules through the first DC / DC converter 1 and the first DC / DC converter 2.

[0067] Figure 2 shows a schematic diagram of another micro energy storage system. As shown in Figure 2, continuing with the application scenario of two photovoltaic modules, switch 1 is added to the output path of photovoltaic module 1, and switch 2 is added to the output path of photovoltaic module 2. When charging is required, the first DC / DC converter 1 and the first DC / DC converter 2 can store the electrical energy generated by the photovoltaic modules into the battery module through the conducting charge / discharge switch unit. When outputting electrical energy is required, photovoltaic modules 1 and 2 can directly output electrical energy through switches 1 and 2 respectively, or the battery module can output electrical energy through the first DC / DC converter 1 and the first DC / DC converter 2, and switches 1 and 2.

[0068] The above-mentioned solutions support a limited range of operating modes, including charging and discharging of the battery module and output from the photovoltaic module. This limited flexibility cannot meet the needs of different practical scenarios. Furthermore, in the second solution, the energy loss during voltage conversion by the first DC / DC converter leads to reduced energy utilization efficiency when the battery module outputs power.

[0069] Therefore, optimizing the working mode of energy storage circuits and improving their flexibility is a technical problem that urgently needs to be solved.

[0070] In view of this, this application proposes an energy storage circuit in which each first DC / DC converter and the energy storage element are connected through an independent path unit. Each path supports the storage of the energy storage element when charging and discharging is required. The first DC / DC converter can store the electrical energy generated by the power generation module into the energy storage element through the corresponding path unit, and the energy storage element can also directly output the stored electrical energy through the corresponding path unit without going through the converter, thereby improving the discharge efficiency of the energy storage element. Since the path units between the first DC / DC converter and the energy storage element are set independently, different branches can work in different modes, thereby enriching the working modes of the energy storage circuit, improving the flexibility of circuit operation, and meeting the working needs of different scenarios.

[0071] The energy storage circuit proposed in this application is applicable to energy storage systems, and can also be used in any energy storage system that stores electrical energy generated by a power generation module. This application illustrates the embodiment using a micro-inverter system as an example.

[0072] The following detailed description of how this application performs electrical energy storage uses specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0073] Figure 3 is a schematic diagram of an energy storage circuit provided in an embodiment of this application. As shown in Figure 3, the energy storage circuit 100 may include: N power generation modules 170, N first DC / DC converters 110, N path units 130, and a first controller 160; N is an integer greater than or equal to 2.

[0074] The capacity module 170 is electrically connected to the energy storage element through the corresponding first DC / DC converter 110 and the corresponding path unit 130; the first controller 160 is electrically connected to the first DC / DC converter 110 and the path unit 130. The connection relationship between the first controller 160 and the first DC / DC converter 110 and the path unit 130 is not shown in Figure 3.

[0075] The power generation module 170 can be any module capable of generating electrical energy, such as a photovoltaic module, a wind turbine, or a hydroelectric generator. It should be understood that the power generation module 170 can be integrated with other structures of the energy storage circuit 100, or it can be implemented as a separate device independently of other structures in the energy storage circuit 100; this embodiment does not limit this. Figure 3 illustrates the integrated approach as an example.

[0076] The energy storage element is any element that can store electrical energy and release it when needed, such as a battery module. It should be understood that the energy storage element can be integrated with other structures in the energy storage circuit 100, or it can be implemented as a separate device independently of other structures in the energy storage circuit 100; this application embodiment does not limit this. Figure 3 illustrates this in a standalone manner.

[0077] The first DC / DC converter 110 can be any device that converts an input DC voltage into a desired DC voltage for output, such as a DC-DC boost converter, a DC-DC buck converter, etc. The first DC / DC converter 110 may include one DC / DC conversion unit 111, or multiple DC / DC conversion units 111, depending on the circuit structure of the first DC / DC converter 110. Furthermore, the first DC / DC converter 110 has a Maximum Power Point Tracking (MPPT) function, which detects the photovoltaic module's power generation voltage in real time and tracks the highest output voltage and current values ​​to output maximum power. For how to implement the MPPT function of the first DC / DC converter 110, please refer to the description in the prior art; this embodiment will not be repeated here.

[0078] The path unit 130 can be any unit that can be turned on or off under signal control, such as a transistor switch, an electromagnetic switch, etc.

[0079] The first controller 160 can be any module capable of outputting control signals, such as high-level or low-level signals, for example, a microcontroller, embedded processor, programmable logic device, or any other processing unit. Optionally, in addition to the processing unit, it may also include peripheral circuit units for the processing unit.

[0080] The first controller 160 is used to control the first DC / DC converter 110 and the path unit 130 to achieve different operating modes. For example, for each path unit 130, when the control path unit 130 is disconnected, the power generation module 170 can output electrical energy through the corresponding first DC / DC converter 110; and when the control path unit 130 is turned on, the power generation module 170 can charge the energy storage element through the corresponding first DC / DC converter 110 and the corresponding path unit 130, or the energy storage element can output electrical energy through the corresponding path unit 130. Since the path unit 130 corresponding to each first DC / DC converter 110 is independently controlled, the branch corresponding to each first DC / DC converter 110 can independently be in its own required operating mode, such as charging / discharging the energy storage element corresponding to the first DC / DC converter 110, or the first DC / DC converter 110 directly outputting, thereby enabling the entire energy storage circuit 100 to achieve more operating modes.

[0081] It should be understood that the first controller 160 can be integrated with other structures in the energy storage circuit 100, or it can be implemented as a separate device independent of other structures in the energy storage circuit 100. Figure 3 illustrates the integrated approach as an example.

[0082] In summary, by setting independent path units between the first DC / DC converter and the energy storage element, when the energy storage element needs to be charged and discharged, the first DC / DC converter can store the electrical energy generated by the power generation module into the energy storage element through the corresponding path unit. The energy storage element can also directly output the stored electrical energy through the corresponding path unit without going through the converter, thereby improving the discharge efficiency of the energy storage element. Since the path units between the first DC / DC converter and the energy storage element are set independently, different branches can operate in different modes. When the energy storage element turns off its charging and discharging function, the electrical energy generated by the power generation module can be directly output, thereby ensuring the efficiency of direct utilization of the power generation module's power generation, enriching the working modes of the energy storage circuit, improving the flexibility of circuit operation, and meeting the working needs of different scenarios.

[0083] Figure 4 is a schematic diagram of another energy storage circuit provided in an embodiment of this application. As shown in Figure 4, the path unit 130 includes: at least one first switch 131; the at least one first switch 131 are connected in series to form a series structure, one end of the series structure is electrically connected to the corresponding first DC / DC converter 110, and the other end of the series structure is electrically connected to the energy storage element.

[0084] The first switch 131 can be any switch that conducts based on a high or low level, such as a transistor, a metal-oxide-semiconductor field-effect transistor (MOSFET), also known as a MOSFET, thyristor, etc. The first switches 131 within the same path unit 130 can be of the same or different types. The first switches 131 in different path units 130 can also be of the same or different types. For example, a path unit 130 can be composed of at least one transistor connected in series, or a transistor and a MOSFET connected in series, or at least one MOSFET connected in series, or one path unit 130 can be composed of at least one transistor connected in series, and another path unit 130 can be composed of at least one MOSFET connected in series. This application does not limit this aspect.

[0085] In one example, path unit 130 includes two first switches 131, which are two N-metal-oxide-semiconductor (NMOS) transistors. The drain of one NMOS transistor is electrically connected to a first DC / DC converter 110, and its source is electrically connected to the source of the other NMOS transistor. The drain of the other NMOS transistor is electrically connected to an energy storage element. Path unit 130 implemented with the above structure has a faster response speed and more sensitive switching.

[0086] Accordingly, the first controller 160 is specifically used to control the first switch 131 to be in a conducting state or an open state. For example, the first controller 160 can control it by outputting a high-level or low-level signal to the first switch 131. Specifically, when the first switch 131 in the series structure is in the conducting state, the path unit 130 is turned on; when the first switch 131 in the series structure is in the open state, the path unit 130 is turned off.

[0087] The first DC / DC converter 110 includes: multiple DC / DC conversion units 111, also referred to as DC / DC units 111; the multiple DC / DC conversion units 111 are connected in parallel, and the output terminals of the multiple DC / DC conversion units 111 are all electrically connected to one end of the path unit 130 corresponding to their respective first DC / DC converter 110. The parallel connection of multiple DC / DC conversion units 111 can enrich the implementation methods of the first DC / DC converter 110 and achieve higher power output or voltage regulation capability.

[0088] Optionally, the energy storage circuit 100 further includes: N first output terminals 181 and second output terminals 182; the positive output terminal of the first DC / DC converter 110 is electrically connected to the corresponding first output terminal 181; the negative output terminals of the multiple first DC / DC converters 110 are all electrically connected to the second output terminals 182, and each first DC / DC converter 110 can output a positive voltage through the corresponding first output terminal 181, and each first DC / DC converter 110 can output a negative voltage through the second output terminal 182.

[0089] Furthermore, the positive input terminal of the first DC / DC converter 110 is electrically connected to the positive terminal "+" of the power generation module 170, and the negative input terminal of the first DC / DC converter 110 is electrically connected to the negative terminal "-" of the power generation module 170; the other end of the path unit 130 is electrically connected to the positive terminal "+" of the energy storage element, and the negative terminal "-" of the energy storage element is electrically connected to the negative output terminals and the second output terminal 182 of the multiple first DC / DC converters 110.

[0090] Further, the first controller 160 includes: a first sampling unit 162, a first control unit 163, and a first drive unit 161. The first sampling unit 162 is electrically connected to at least one of the first DC / DC converter 110, the path unit 130, and the energy storage element; the first sampling unit 162 is used to sample and obtain a first electrical parameter; the first electrical parameter includes at least one of the following: voltage, current, temperature, smoke, etc.; the first control unit 163 is electrically connected to the first sampling unit 162; the first control unit 163 is used to execute a control strategy according to the first electrical parameter to output a first control signal. For example, when the temperature of the energy storage element exceeds a preset value, the first control unit 163 can control the path unit 130 to disconnect to stop the energy storage element from working, and output a control signal to disconnect the path unit 130; or, the first control unit 163 can control the operation of the first DC / DC converter 110 to output maximum power according to the output voltage and current values ​​of the first DC / DC converter 110; or, when abnormal smoke appears in the energy storage circuit 100, the energy storage circuit 100 is stopped from working according to the smoke parameter. The first drive unit 161 is electrically connected to the first control unit 163, the first DC / DC converter 110, and the path unit 130. The first drive unit 161 is used to convert the level of the first control signal output by the first control unit 163 to drive the first DC / DC converter 110 to work, and to drive the path unit 130 to be turned on or off. The first controller 160 can control the energy storage circuit 100 to be in normal working state. The connection relationship between the first controller 160, the first DC / DC converter 110, the path unit 130, and the energy storage element is not shown in Figure 4.

[0091] The circuit structure of the first DC / DC converter 110 will be described below. For ease of explanation, the first DC / DC converter 110 and its corresponding path unit 130 will be referred to as a channel in the following embodiments.

[0092] Figure 5 is a schematic diagram of the structure of the third energy storage circuit provided in the embodiment of this application. As shown in Figure 5, the first DC / DC converter 110 includes: a second switch 113, a third switch 114, an inductor 115, a first capacitor 116, a second capacitor 117, a fourth switch 118, and a fifth switch 119.

[0093] One end of the second switch 113 is electrically connected to the positive input terminal of the first DC / DC converter 110; one end of the third switch 114 is electrically connected to the positive output terminal of the first DC / DC converter 110; one end of the inductor 115 is electrically connected to the other end of the second switch 113, and the other end of the inductor 115 is electrically connected to the other end of the third switch 114; one end of the first capacitor 116 is electrically connected to the positive input terminal of the first DC / DC converter 110, and the other end of the first capacitor 116 is electrically connected to the negative input terminal of the first DC / DC converter 110; the second capacitor 11... One end of capacitor 7 is electrically connected to the positive output terminal of the first DC / DC converter 110, and the other end of capacitor 117 is electrically connected to the negative output terminal of the first DC / DC converter 110; one end of the fourth switch 118 is electrically connected to one end of inductor 115, and the other end of the fourth switch 118 is electrically connected to the negative input terminal of the first DC / DC converter 110; one end of the fifth switch 119 is electrically connected to the other end of inductor 115, and the other end of the fifth switch 119 is electrically connected to the other end of the fourth switch 118 and the negative output terminal of the first DC / DC converter 110.

[0094] When the first controller 160 sends a high level to the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119, the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 are turned on; when the first controller 160 sends a low level to the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119, the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 are turned off.

[0095] The first controller 160 can control the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 to turn on or off, so that the first DC / DC converter 110 outputs a voltage value that matches the connected circuit. The first controller 160 can also control the second switch 113 and the third switch 114 to turn on, and the fourth switch 118 and the fifth switch 119 to turn off, so that the first DC / DC converter 110 directly outputs the voltage value output by the production module 170.

[0096] The first controller 160 controls the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 to be turned on or off, and controls the path unit 130 to be turned on or off, so that the channel containing any path unit 130 can be in different operating modes. The energy storage circuit 100 includes multiple channels. By controlling the operating mode of each channel, the energy storage circuit 100 can be in different operating modes. The operating modes of the energy storage circuit 100 are described below.

[0097] (I) Charging Mode

[0098] When the energy storage circuit 100 is in charging mode, all channels containing path units 130 are also in charging mode. When the channels containing path units 130 are in charging mode, path units 130 remain continuously conductive. The second switch 113, third switch 114, fourth switch 118, and fifth switch 119 are switched on or off in response to the control of the first controller 160. The first DC / DC converter 110 converts the DC voltage output from the power generation module 170 to output a voltage value matching the connected circuit. The power generation module 170 can charge the energy storage element through the corresponding first DC / DC converter 110 and the corresponding path unit 130. In this mode, the energy storage circuit 100 can store the electrical energy generated by the power generation module 170 into the energy storage element without outputting electrical energy to the user, thus achieving energy storage.

[0099] (II) Discharge Mode

[0100] When the energy storage circuit 100 is in discharge mode, all channels containing path unit 130 are also in discharge mode. When the channel containing path unit 130 is in discharge mode, path unit 130 remains continuously conductive, while the second switch 113, third switch 114, fourth switch 118, and fifth switch 119 remain continuously disconnected. The energy storage element can output stored electrical energy through path unit 130, and the power generation module 170 stops outputting electrical energy through the first DC / DC converter 110. The energy storage element outputs stored electrical energy through the corresponding path unit 130 for user use. This allows the energy storage element to output electrical energy to meet user electricity needs when the power generation module 170 and / or the first DC / DC converter 110 malfunction and fail to output electrical energy.

[0101] (III) Direct Access Mode

[0102] When the energy storage circuit 100 is in direct-through mode, all channels containing path unit 130 are also in direct-through mode. When the channel containing path unit 130 is in direct-through mode, path unit 130 remains continuously disconnected, second switch 113 and third switch 114 remain continuously connected, and fourth switch 118 and fifth switch 119 remain continuously disconnected. The first DC / DC converter 110 does not perform voltage conversion on the DC voltage output from the power generation module 170, but directly outputs the voltage value output by the power generation module 170. Since the first DC / DC converter 110 experiences energy loss during voltage conversion, directly outputting the voltage value output by the power generation module 170 in direct-through mode can improve the direct utilization efficiency of the power generation generated by the power generation module 170.

[0103] (iv) Inter-channel mixing mode

[0104] When the energy storage circuit 100 is in inter-channel mixing mode, at least two channels have different current modes. The channel modes can include charging mode, intra-channel mixing mode, discharging mode, and pass-through mode.

[0105] When the channel where the path unit 130 is located is in charging mode / intra-channel mixed mode, the path unit 130 is continuously turned on, and the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 are turned on or off in response to the control of the first controller 160.

[0106] When the channel where path unit 130 is located is in discharge mode, path unit 130 is continuously turned on, and the second switch 113, the third switch 114, the fourth switch 118 and the fifth switch 119 are all continuously turned off.

[0107] When the channel where path unit 130 is located is in straight-through mode, path unit 130 is continuously disconnected, second switch 113 and third switch 114 are continuously connected, and fourth switch 118 and fifth switch 119 are continuously disconnected.

[0108] In one example: a portion of the first DC / DC converter 110 operates in pass-through mode, while another portion operates in charging mode. Under strong sunlight, some channels can generate enough power to meet the user's needs, while the battery is not fully charged. In this case, the energy storage circuit 100 can directly output the power generation module 170 through one channel to supply the user, and use the other channel to charge the battery with the power generation module 170 to store excess power. The states of the path unit 130, and the second switch 113, third switch 114, fourth switch 118, and fifth switch 119 when the channels are in pass-through mode and charging mode are as described above, and will not be repeated here.

[0109] In one example: a portion of the first DC / DC converter 110 operates in pass-through mode, while another portion operates in discharge mode. For instance, the energy storage circuit 100 can supply power generated by the power generation module 170 to users through a portion of its channels, and supply the energy stored in the energy storage element to users through another portion of its channels. In low-light conditions, the energy storage circuit 100 can meet users' electricity needs by combining the energy output from the energy storage element with the pass-through output from a portion of its channels.

[0110] In one example: a portion of the first DC / DC converter 110 operates in direct mode, while another portion operates in a mixed-mode within the channel. For instance, a portion of the energy storage circuit 100 directly outputs the electrical energy generated by the power generation module 170 for user use, while another portion outputs electrical energy after voltage conversion via the first DC / DC converter 110. The energy storage element outputs the stored electrical energy through the corresponding path unit 130. In low-light conditions, the energy storage circuit 100 can use a combination of outputting electrical energy through the energy storage element via some channels, combined with outputting electrical energy through voltage conversion via the first DC / DC converter 110, and outputting electrical energy directly via some channels to meet the user's electricity needs.

[0111] In summary, since the path units between the first DC / DC converter and the energy storage element are set independently, different channels of the energy storage circuit can operate in different modes. This ensures the efficiency of direct utilization of the power generation from the power generation module while improving the flexibility of circuit operation and meeting the working requirements of different scenarios.

[0112] (V) In-channel mixing mode

[0113] When the energy storage circuit 100 is in the channel-in-channel hybrid mode, all channels containing path unit 130 are also in the channel-in-channel hybrid mode. When the channel containing path unit 130 is in the channel-in-channel hybrid mode, path unit 130 remains continuously conductive, and the second switch 113, third switch 114, fourth switch 118, and fifth switch 119 are switched on or off in response to the control of the first controller 160. The first DC / DC converter 110 performs voltage conversion on the DC voltage output from the power generation module 170 to output a voltage value matching the connected circuit. Depending on the user's power demand, the channel-in-channel hybrid mode can also be either: channel-in-channel hybrid mode 1 or channel-in-channel hybrid mode 2.

[0114] (1) When the energy storage circuit 100 is in channel-in-channel hybrid mode 1, all channels are in channel-in-channel hybrid mode 1. When the channel containing the path unit 130 is in channel-in-channel hybrid mode 1, the path unit 130 is continuously conducting. The second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 are turned on or off in response to the control of the first controller 160. The power generation module 170 can output electrical energy through the first DC / DC converter 110, and can also charge the energy storage element through the corresponding first DC / DC converter 110 and the corresponding path unit 130. When the user's electricity demand is less than the electrical energy generated by the power generation module 170, it can meet the user's electricity demand and store excess electrical energy for later use when needed.

[0115] (2) When the energy storage circuit 100 is in channel-in-channel hybrid mode 2, all channels are in channel-in-channel hybrid mode 2. When the channel containing path unit 130 is in channel-in-channel hybrid mode 2, path unit 130 remains continuously conductive. The second switch 113, third switch 114, fourth switch 118, and fifth switch 119 are switched on or off in response to the control of the first controller 160. The power generation module 170 can output electrical energy through the first DC / DC converter 110, and the energy storage element can also output stored electrical energy through the corresponding path unit 130. When the user's electricity demand exceeds the electrical energy generated by the power generation module 170, the insufficient electrical energy can be output through the energy storage element to meet the user's electricity demand.

[0116] In summary, since the path units between the first DC / DC converter and the energy storage element are set independently, the energy storage circuit can operate in different modes. This ensures the efficiency of direct utilization of the power generation from the power generation module, while enriching the operating modes of the energy storage circuit, improving the flexibility of circuit operation, and meeting the working needs of different scenarios.

[0117] Figure 6 is a schematic diagram of an energy storage system provided in an embodiment of this application. As shown in Figure 6, the energy storage system includes an energy storage circuit 100 and an inverter 200; the energy storage circuit 100 and the inverter 200 are electrically connected; the output terminal of the inverter 200 is used to connect to a load, and the inverter 200 is used to invert the DC power output by the energy storage circuit 100 into AC power.

[0118] The energy storage system can store the electrical energy generated by the power generation module into the energy storage element by using the energy storage circuit 100. When needed, the electrical energy in the energy storage element is supplied to the inverter 200 to be converted into AC power for users, thereby improving the stability of power output.

[0119] The inverter 200 includes: N second DC / DC converters 210, DC / AC converters 230, and a second controller 240; the positive input terminal of the second DC / DC converter 210 is electrically connected to the corresponding first output terminal 181 of the energy storage circuit 100; the negative input terminal of the second DC / DC converter 210 is electrically connected to the second output terminal 182 of the energy storage circuit 100; the output terminal of the second DC / DC converter 210 is electrically connected to the DC / AC converter 230; the output terminal of the DC / AC converter 230 is used to connect to the load; the second controller 240 is electrically connected to the second DC / DC converter 210 and the DC / AC converter 230.

[0120] The second DC / DC converter 210 can be any device that converts the input DC voltage into the desired DC voltage for output, such as a DC-DC boost converter, a DC-DC buck converter, etc. The second DC / DC converter 210 may include one or more DC / DC conversion units, depending on the circuit structure of the second DC / DC converter. The second DC / DC converter 210 has an MPPT function, which modulates the input DC voltage into a sinusoidal waveform. For details on how to implement the MPPT function of the second DC / DC converter 210, please refer to the description in the prior art; this embodiment will not elaborate further.

[0121] The DC / AC converter 230 can be, for example, any device that inverts the input DC voltage into AC power. The DC / AC converter 230 is used to invert the waveform modulated by the second DC / DC converter 210 into a sine wave that meets the user's requirements for user use.

[0122] The second controller 240 can be any module capable of triggering its output signal based on a high or low level, such as a microcontroller, embedded processor, programmable logic device, or any other processing unit. Optionally, in addition to the processing unit, it may also include peripheral circuit units for the processing unit. The second controller 240 is used to control the operation of the second DC / DC converter 210 and the DC / AC converter 230, and can invert the DC power generated by the power generation module 170 and / or the DC power stored in the energy storage element into AC power that meets the requirements of the power load. The connection relationship between the second controller 240 and the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 is not shown in Figure 6.

[0123] Further, the second controller 240 includes: a second sampling unit 242, a second control unit 244, and a second drive unit 241; the second sampling unit 242 is electrically connected to at least one of the second DC / DC converter 210 and the DC / AC converter 230; the second sampling unit 242 is used to sample and obtain a second electrical parameter; the second electrical parameter includes at least one of the following: voltage, current, temperature, smoke, etc.; the second control unit 244 is electrically connected to the second sampling unit 242; the second control unit 244 is used to execute a control strategy according to the second electrical parameter to output a second control signal. For example, the second control unit 244 can control the operation of the second DC / DC converter 210 to output maximum power according to the output voltage and current values ​​of the second DC / DC converter 210; or, the second control unit 244 can control the DC / AC converter 230 to stop working when the temperature of the DC / AC converter 230 exceeds a preset temperature; or, the second control unit 244 can stop the inverter 200 from working according to the smoke parameter when abnormal smoke appears in the inverter 200. The second drive unit 241 is electrically connected to the second control unit 244, the second DC / DC converter 210, and the DC / AC converter 230. The second drive unit 241 is used to perform level conversion on the control signal output by the second control unit 244 to drive the second DC / DC converter 210 and / or the DC / AC converter 230 to work. The second controller 240 can control the inverter 200 to be in normal working condition.

[0124] Furthermore, the first controller 160 further includes a first communication unit 164; the second controller 240 further includes a second communication unit 243. The first controller 160 and the second controller 240 establish a communication connection through the first communication unit 164 and the second communication unit 243 using any communication protocol, such as: hardware communication protocol RS-485, serial communication protocol (Controller Area Network, CAN), wireless local area network (Wireless Fidelity, WIFI), etc. The first controller 160 performs power control and / or status monitoring on the inverter 200 to ensure that the electrical energy of the power generation module can flow into the energy storage element, realizing the controllability of charging the energy storage element.

[0125] In summary, the energy storage system of this application embodiment, by setting an independent path unit between the first DC / DC converter and the energy storage element, allows the first DC / DC converter to store the electrical energy generated by the power generation module into the energy storage element through the corresponding path unit when the energy storage element needs to be charged or discharged. The energy storage element can also directly output the stored electrical energy through the corresponding path unit without going through the converter, thereby improving the discharge efficiency of the energy storage element. Since the path units between the first DC / DC converter and the energy storage element are independently set, different branches can operate in different modes, thus ensuring the efficiency of direct utilization of the power generation module's electricity while enriching the operating modes of the energy storage circuit, improving the flexibility of circuit operation, and meeting the working needs of different scenarios. When any channel between the power generation module and the inverter, or between the power generation module and the energy storage element, or between the energy storage element and the inverter fails, the impact on the remaining channels can be avoided, improving the reliability of the system.

[0126] The following example, using the capacity module 170 as two photovoltaic modules, illustrates the structure of the energy storage system.

[0127] Figure 7 is a schematic diagram of another energy storage system provided in an embodiment of this application. As shown in Figure 7, the energy storage circuit 100 includes two photovoltaic modules, two first DC / DC converters 110, two path units 130, and a first controller 160. The inverter 200 includes two second DC / DC converters 210.

[0128] For ease of explanation, in the following embodiments, photovoltaic module 1 is labeled as 1701, photovoltaic module 2 is labeled as 1702, first DC / DC converter 1 is labeled as 1101, first DC / DC converter 2 is labeled as 1102, path unit 1 is labeled as 1301, path unit 2 is labeled as 1302, second DC / DC converter 1 is labeled as 2101, and second DC / DC converter 2 is labeled as 2102.

[0129] The positive input terminal of the first DC / DC converter 1101 is electrically connected to the positive terminal PV1+ of the photovoltaic module 1701, and the negative input terminal of the first DC / DC converter 1101 is electrically connected to the negative terminal PV1- of the photovoltaic module 1701. The positive output terminal of the first DC / DC converter 1101 is electrically connected to the first output terminal P1+ of the energy storage circuit 100. The positive input terminal of the first DC / DC converter 1102 is electrically connected to the positive terminal PV2+ of the photovoltaic module 1702, and the negative input terminal of the first DC / DC converter 1102 is electrically connected to the negative terminal PV2- of the photovoltaic module 1702. The positive output terminal of the first DC / DC converter 1102 is electrically connected to the first output terminal P2+ of the energy storage circuit 100. The negative output terminal of the first DC / DC converter 1101 is electrically connected to the negative output terminal of the first DC / DC converter 1102, the negative terminal of the energy storage element, and the second output terminal P- of the energy storage circuit 100.

[0130] The first DC / DC converter 1101 includes: a second switch Q1, a third switch Q3, an inductor L1, a first capacitor C1, a second capacitor C2, a fourth switch Q2, and a fifth switch Q4; one end of the second switch Q1 is electrically connected to the positive input terminal PV1+ of the first DC / DC converter 1101; one end of the third switch Q3 is electrically connected to the positive output terminal P1+ of the first DC / DC converter 1101; one end of the inductor L1 is electrically connected to the other end of the second switch Q1, and the other end of the inductor L1 is electrically connected to the other end of the third switch Q3; one end of the first capacitor C1 is electrically connected to the positive input terminal PV1+ of the first DC / DC converter 1101, and the other end of the first capacitor C1 is electrically connected to the positive output terminal P1+ of the first DC / DC converter 1101. The negative input terminal PV1- of the first DC / DC converter 1101 is electrically connected; one end of the second capacitor C2 is electrically connected to the positive output terminal P1+ of the first DC / DC converter 1101, and the other end of the second capacitor C2 is electrically connected to the negative output terminal P- of the first DC / DC converter 1101; one end of the fourth switch Q2 is electrically connected to one end of the inductor L1, and the other end of the fourth switch Q2 is electrically connected to the negative input terminal PV1- of the first DC / DC converter 1101; the first end of the fifth switch Q4 is electrically connected to the other end of the inductor L1, and the other end of the fifth switch Q4 is electrically connected to the other end of the fourth switch Q2 and the negative output terminal P- of the first DC / DC converter 1101. When the first controller 160 sends a high-level signal to the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4, these switches are turned on; when the first controller 160 sends a low-level signal to these switches, they are turned off. By controlling the on / off state of the second switches Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4, the first controller 160 can control the output voltage of the first DC / DC converter 1101 to match the connected circuit. By controlling the second switches Q1 and the third switch Q3 to be on and the fourth switches Q2 and the fifth switch Q4 to be off, the first controller 160 can control the first DC / DC converter 1101 to directly output the voltage value output by the photovoltaic module 1.

[0131] The path unit 1301 includes a first switch Q11 and a first switch Q12. The drain of the first switch Q11 is electrically connected to the positive output terminal of the first DC / DC converter 1101. The source of the first switch Q11 is electrically connected to the source of the first switch Q12, and the drain of the first switch Q12 is electrically connected to the positive terminal of the energy storage element.

[0132] The first DC / DC converter 1102 includes: a second switch Q5, a third switch Q7, an inductor L2, a first capacitor C3, a second capacitor C4, a fourth switch Q6, and a fifth switch Q8; one end of the second switch Q5 is electrically connected to the positive input terminal PV2+ of the first DC / DC converter 1102; one end of the third switch Q7 is electrically connected to the positive output terminal P2+ of the first DC / DC converter 1102; one end of the inductor L2 is electrically connected to the other end of the second switch Q5, and the other end of the inductor L2 is electrically connected to the other end of the third switch Q7; one end of the first capacitor C3 is electrically connected to the positive input terminal PV2+ of the first DC / DC converter 1102, and the other end of the first capacitor C4 is electrically connected to the positive output terminal P2+ of the first DC / DC converter 1102. The negative input terminal PV2- of the first DC / DC converter 1102 is electrically connected; one end of the second capacitor C4 is electrically connected to the positive output terminal P2+ of the first DC / DC converter 1102, and the other end of the second capacitor C4 is electrically connected to the negative output terminal P- of the first DC / DC converter 1102; one end of the fourth switch Q6 is electrically connected to one end of the inductor L2, and the other end of the fourth switch Q6 is electrically connected to the negative input terminal PV2- of the first DC / DC converter 1102; the first end of the fifth switch Q8 is electrically connected to the other end of the inductor L2, and the other end of the fifth switch Q8 is electrically connected to the other end of the fourth switch Q6 and the negative output terminal P- of the first DC / DC converter 1102. When the first controller 160 sends a high-level signal to the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8, these switches are turned on; when the first controller 160 sends a low-level signal to these switches, they are turned off. By controlling the on / off state of the second switches Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8, the first controller 160 can control the output voltage of the first DC / DC converter 1102 to match the connected circuit. By controlling the second switches Q5 and the third switch Q7 to be on and the fourth switches Q6 and the fifth switch Q8 to be off, the first controller 160 can control the first DC / DC converter 1102 to directly output the voltage value output by the photovoltaic module 2.

[0133] The path unit 1302 includes: a first switch Q9 and a first switch Q10. The drain of the first switch Q9 is electrically connected to the positive output terminal PV2+ of the first DC / DC converter 1102; the source of the first switch Q9 is electrically connected to the source of the first switch Q10; and the drain of the first switch Q10 is electrically connected to the positive terminal of the energy storage element.

[0134] The first control unit 163 is electrically connected to the gates of the second switches Q1 and Q5, the third switches Q3 and Q7, the fourth switches Q2 and Q6, the fifth switches Q4 and Q8, and the first switches Q9, Q10, Q11 and Q12 respectively via the first drive unit 161. The first control unit 163 and the above connection relationship are not shown in Figure 7.

[0135] The positive input terminal of the second DC / DC converter 2101 is electrically connected to the first output terminal P1+ of the energy storage circuit 100; the positive input terminal of the second DC / DC converter 2102 is electrically connected to the first output terminal P2+ of the energy storage circuit 100; the negative input terminal of the second DC / DC converter 2101 is electrically connected to the negative input terminal of the second DC / DC converter 2102 and the second output terminal P- of the energy storage circuit 100. The output terminal of the second DC / DC converter 2101 is electrically connected to the output terminal of the second DC / DC converter 2102 and the DC / AC converter 230; the output terminal of the DC / AC converter 230 is used for electrical connection to the load.

[0136] The second controller 240 is electrically connected to the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230, respectively, and is used to control the operation of the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230. It can invert the DC power generated by the photovoltaic module 1701 and / or the photovoltaic module 1702 and / or the DC power stored in the energy storage element into AC power that meets the requirements of the electrical load. The connection relationship between the second controller 240 and the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 is not shown in Figure 7.

[0137] Continuing with the example of the two photovoltaic modules shown in Figure 7, the following explains how the energy storage circuit stores the electrical energy generated by the photovoltaic modules into the energy storage element, or how the energy storage element outputs the electrical energy, or how the electrical energy generated by the photovoltaic modules is directly output to the inverter.

[0138] The energy storage circuit 100 can operate in any of the following modes: charging mode, discharging mode, direct-through mode, inter-channel hybrid mode, intra-channel hybrid mode 1, and intra-channel hybrid mode 2.

[0139] The working principle of the energy storage circuit 100 in charging mode is explained below.

[0140] Figure 8 is a schematic diagram of the first energy storage circuit operating mode provided in this application embodiment. As shown in Figure 8, the energy storage circuit 100 operates in charging mode, and the arrows in the figure indicate the direction of electrical signal flow. The first controller 160 controls the first DC / DC converter 1101 to convert the DC voltage PV1+ output by the photovoltaic module 1701 into a charging voltage matching the energy storage element; the first controller 160 sends a high level to the first switches Q11 and Q12, the first switches Q11 and Q12 are turned on, the path unit 1301 is turned on, forming a charging path between the first DC / DC converter 1101 and the energy storage element, realizing the storage of electrical energy output by the photovoltaic module 1701 into the energy storage element. The first controller 160 controls the first DC / DC converter 1102 to convert the DC voltage PV2+ output by the photovoltaic module 1702 into a charging voltage matching the energy storage element. The first controller 160 sends a high level to the first switches Q9 and Q10, turning on the first switches Q9 and Q10, and turning on the path unit 1302, forming a charging path between the first DC / DC converter 1102 and the energy storage element, thereby storing the electrical energy output by the photovoltaic module 1702 into the energy storage element. In one example, the first DC / DC converter 1101 and the first DC / DC converter 1102, through the MPPT function, enable the photovoltaic module 1701 and the photovoltaic module 1702 to charge the energy storage element at maximum power.

[0141] How the first controller 160 controls the first DC / DC converter 1101 to convert the DC voltage PV1+ output by the photovoltaic module 1701, and controls the first DC / DC converter 1102 to convert the DC voltage PV2+ output by the photovoltaic module 1702, to a charging voltage matching the energy storage element, depends on the magnitude of the output voltages of the photovoltaic modules 1701 and 1702, as well as the circuit structures of the first DC / DC converters 1101 and 1102. For details, please refer to the descriptions in the prior art; further details are omitted here. The first controller 160 is not shown in Figure 8.

[0142] The working principle of the energy storage circuit 100 in discharge mode is explained below.

[0143] Figure 9 is a schematic diagram of the second energy storage circuit operating mode provided in the embodiment of this application. As shown in Figure 9, the energy storage circuit 100 operates in discharge mode, and the arrows in the figure indicate the direction of the electrical signal flow.

[0144] The first controller 160 sends a high level to the first switches Q11 and Q12, turning on the first switches Q11 and Q12 and turning on the path unit 1301, forming a discharge path between the energy storage element and the first output terminal P1+. The first controller 160 sends a low level to the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4, causing the first DC / DC converter 1101 to stop working and disconnecting the path between the photovoltaic module 1701 and the first output terminal P1+, thereby realizing the output of the electrical energy stored in the energy storage element to the second DC / DC converter 2101 of the inverter 200. The first controller 160 sends a high-level signal to the first switches Q9 and Q10, turning them on and activating the path unit 1302, thus forming a discharge path between the energy storage element and the first output terminal P2+. The first controller 160 then sends a low-level signal to the second switches Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8, stopping the first DC / DC converter 1102 and disconnecting the path between the photovoltaic module 1702 and the first output terminal P2+. This allows the stored energy from the energy storage element to be output to the second DC / DC converter 2102 of the inverter 200. The second controller 240 controls the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 to convert the DC output from the energy storage element into AC power for user use. Simultaneously, the first controller 160 controls the power output of the energy storage element through communication with the inverter 200. The first controller 160 and the second controller 240 are not shown in Figure 9.

[0145] When the energy storage circuit 100 is not using the charging and discharging function of the energy storage element, such as when the energy storage element is fully charged, when the energy storage element malfunctions, or when the energy storage element is forcibly disconnected, the energy storage circuit 100 can also operate in a pass-through mode. The operating principle of the energy storage circuit 100 in pass-through mode is explained below.

[0146] Figure 10 is a schematic diagram of the third energy storage circuit operating mode provided in the embodiment of this application. As shown in Figure 10, the energy storage circuit 100 operates in direct mode, and the arrows in the figure indicate the direction of the electrical signal flow.

[0147] The first controller 160 sends a low level to the first switches Q11 and Q12, causing the first switches Q11 and Q12 to open, the path unit 1301 to open, and the path between the first DC / DC converter 1101 and the energy storage element to be disconnected; the first controller 160 sends a low level to the first switches Q9 and Q10, causing the first switches Q9 and Q10 to open, the path unit 1302 to open, and the path between the first DC / DC converter 1102 and the energy storage element to be disconnected. The first controller 160 sends a high level to the second switch Q1 and the third switch Q3, turning on the second switch Q1 and the third switch Q3. The first controller 160 sends a low level to the fourth switch Q2 and the fifth switch Q4, turning on the fourth switch Q2 and the fifth switch Q4. This forms a direct path between the photovoltaic module 1701 and the first output terminal P1+ through the second switch Q1, the inductor L1, and the third switch Q3. The electrical energy output by the photovoltaic module 1701 is directly sent to the second DC / DC converter 2101. The first controller 160 sends a high level to the second switch Q5 and the third switch Q7, turning on the second switch Q5 and the third switch Q7. The first controller 160 sends a low level to the fourth switch Q6 and the fifth switch Q8, turning on the fourth switch Q6 and the fifth switch Q8. This forms a direct path between the photovoltaic module 1702 and the first output terminal P2+ through the second switch Q5, the inductor L2, and the third switch Q7. The electrical energy output by the photovoltaic module 1702 is directly sent to the second DC / DC converter 2102. The second controller 240 controls the operation of the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 to invert the DC power transmitted by the photovoltaic modules 1701 and 1702 into AC power for user use. In one example, the second DC / DC converter 2101 and the second DC / DC converter 2102 use MPPT (Maximum Power Transmission Platform) to invert AC power at maximum power for user use. The first controller 160 and the second controller 240 are not shown in Figure 10.

[0148] Each channel of the energy storage circuit 100 can operate in the same operating mode or in different operating modes. For example, the energy storage circuit 100 can operate in a mixed channel mode when the light intensity is strong, the single channel light intensity can meet the user's power demand, and the energy storage element is not fully charged. The working principle of the energy storage circuit 100 operating in the mixed channel mode is explained below.

[0149] Figure 11 is a schematic diagram of the fourth operating mode of the energy storage circuit provided in this application embodiment. As shown in Figure 11, the energy storage circuit 100 operates in a channel-to-channel hybrid mode. Figure 11 illustrates this by taking one channel operating in a through-mode and the other channel operating in a charging mode as an example. The arrows in the figure indicate the direction of the electrical signal flow.

[0150] The first controller 160 can control the photovoltaic module 1701 to form a direct path between itself and the first output terminal P1+, and the inverter 200 converts the electrical energy output by the photovoltaic module 1701 into AC power for user use. The photovoltaic module 1702 forms a charging path with the energy storage element to charge the energy storage element. Alternatively, the first controller 160 can control the photovoltaic module 1702 to form a direct path between itself and the first output terminal P2+, and the inverter 200 converts the electrical energy output by the photovoltaic module 1702 into AC power for user use. The photovoltaic module 1701 forms a charging path with the energy storage element to charge the energy storage element. How the photovoltaic module 1701 or photovoltaic module 1702 forms a charging path with the energy storage element can be referred to the foregoing description, and will not be repeated here. Figure 11 illustrates the example of the photovoltaic module 1701 forming a direct path with the first output terminal P1+, and the photovoltaic module 1702 forming a charging path with the energy storage element to charge the energy storage element. The first controller 160 is not shown in Figure 11.

[0151] Each channel of the energy storage circuit 100 can operate in different operating modes, and a single channel can also operate in different operating modes, referred to as a channel-in-channel hybrid mode. For example, when sunlight is strong, if the electrical energy generated by one photovoltaic module exceeds the user's electricity demand, and the energy storage element is not fully charged, the energy storage circuit 100 can provide the electrical energy generated by the photovoltaic module to the user, and store the excess electrical energy in the energy storage element. Alternatively, when sunlight is weak, if the combined electrical energy generated by two photovoltaic modules is less than the user's electricity demand, and the energy storage element has sufficient power, the energy storage circuit 100 can provide the electrical energy generated by the photovoltaic module to the user, and the insufficient electrical energy is provided to the user by controlling the energy storage element to discharge, thereby meeting the user's electricity demand.

[0152] The following section explains how the energy storage circuit 100 provides the electrical energy generated by the photovoltaic module to the user and stores the excess electrical energy in the energy storage element.

[0153] In this scenario, the electricity generated by photovoltaic module 1701 can be used by users, with excess electricity stored in energy storage devices, and all electricity generated by photovoltaic module 1702 can be stored in energy storage devices; alternatively, the electricity generated by photovoltaic module 1702 can be used by users, with excess electricity stored in energy storage devices, and all electricity generated by photovoltaic module 1701 can be stored in energy storage devices; or, the electricity generated by both photovoltaic modules 1701 and 1702 can be used by users, with both photovoltaic modules 1701 and 1702 storing excess electricity in energy storage devices.

[0154] The following illustration will be based on the example that the electricity generated by photovoltaic modules 1701 and 1702 is provided to users, and that both photovoltaic modules 1701 and 1702 store excess electricity in energy storage elements.

[0155] Figure 12 is a schematic diagram of the fifth energy storage circuit operating mode provided in the embodiment of this application. As shown in Figure 12, the energy storage circuit 100 operates in channel hybrid mode 1, and the arrows in the figure indicate the direction of electrical signal flow.

[0156] The first controller 160 controls the first DC / DC converter 1101 to convert the DC voltage PV1+ output by the photovoltaic module 1701 into a charging voltage that matches the energy storage element, and sends it to the second DC / DC converter 2101. The first controller 160 controls the first DC / DC converter 1102 to convert the DC voltage PV2+ output by the photovoltaic module 1702 into a charging voltage that matches the energy storage element, and sends it to the second DC / DC converter 2102. The second controller 240 controls the second DC / DC converter 2101, the second DC / DC converter 2102 and the DC / AC converter 230 to work, converting the electrical energy output by the photovoltaic module 1701 and the photovoltaic module 1702 into AC power for user use.

[0157] Simultaneously, the first controller 160 sends a high-level signal to the first switches Q11 and Q12, turning on the first switches Q11 and Q12, and activating the path unit 1301, thus forming a charging path between the first DC / DC converter 1101 and the energy storage element. This enables the storage of excess electrical energy beyond what the photovoltaic module 1701 provides to the user. The first controller 160 also sends a high-level signal to the first switches Q9 and Q10, turning on the first switches Q9 and Q10, and activating the path unit 1302. This forms a charging path between the first DC / DC converter 1102 and the energy storage element, again enabling the storage of excess electrical energy beyond what the photovoltaic module 1702 provides to the user. The first controller 160 and the second controller 240 are not shown in Figure 12.

[0158] The following explains how the energy storage circuit 100 provides the electrical energy generated by the photovoltaic module to the user, and how the insufficient electrical energy is discharged by controlling the energy storage element to provide it to the user.

[0159] In this case, the first controller 160 can control the energy storage element to output electrical energy to the first output terminal P1+, or to output electrical energy to the first output terminal P2+, or to output electrical energy to both the first output terminal P1+ and the first output terminal P2+. The specific settings can be made according to actual conditions.

[0160] This application embodiment illustrates the example of a first controller 160 controlling an energy storage element to output electrical energy to both the first output terminal P1+ and the first output terminal P2+.

[0161] Figure 13 is a schematic diagram of the sixth operating mode of the energy storage circuit provided in the embodiment of this application. As shown in Figure 13, the energy storage circuit 100 operates in channel hybrid mode 2, and the arrows in the figure indicate the direction of the electrical signal flow.

[0162] The first controller 160 controls the first DC / DC converter 1101 to convert the DC voltage PV1+ output by the photovoltaic module 1701 into the output voltage of the matching energy storage element, and sends it to the second DC / DC converter 2101; the first controller 160 controls the first DC / DC converter 1102 to convert the DC voltage PV2+ output by the photovoltaic module 1702 into the output voltage of the matching energy storage element, and sends it to the second DC / DC converter 2102. Furthermore, the first controller 160 sends a high-level signal to the first switches Q11 and Q12, turning on the first switches Q11 and Q12 and activating the path unit 1301, thus forming a discharge path between the energy storage element and the first output terminal P1+, enabling the output of the stored energy from the energy storage element to the second DC / DC converter 2101. The first controller 160 also sends a high-level signal to the first switches Q9 and Q10, turning on the first switches Q9 and Q10 and activating the path unit 1302, thus forming a discharge path between the energy storage element and the first output terminal P2+, again enabling the output of the stored energy from the energy storage element to the second DC / DC converter 2102. Photovoltaic modules 1701 and 1702 provide users with insufficient electrical energy, and the energy stored in the energy storage element is output to meet the user's electricity needs.

[0163] The second controller 240 controls the operation of the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 to convert the electrical energy output from the photovoltaic modules 1701 and 1702, as well as the electrical energy output from the energy storage element, into AC power for user use. The first controller 160 and the second controller 240 are not shown in Figure 13.

[0164] Furthermore, the first controller 160 can operate in either mode: manual operation mode or automatic operation mode.

[0165] For example, the first controller 160 can enter the default operating mode when powered on, or the user can trigger the operating mode of the first controller 160 by triggering the first mode switch.

[0166] When the first controller 160 is in manual operation mode, the user can trigger the energy storage circuit 100 to operate in any of the following modes by triggering the second mode switch: charging mode, discharging mode, direct mode, inter-channel hybrid mode, intra-channel hybrid mode 1, and intra-channel hybrid mode 2.

[0167] When the first controller 160 is in automatic operation mode, the user can initialize the configuration by powering on the system, or trigger the third mode switch to enable the energy storage circuit 100 to operate in either of the following modes: battery charging priority mode or battery discharging priority mode.

[0168] When the energy storage circuit 100 is in battery charging priority mode, the energy storage system can determine whether the user has a power demand. If there is a power demand, the energy storage circuit 100 operates in hybrid mode 1 within the channel shown in Figure 12. If the user does not have a power demand, the energy storage circuit 100 operates in charging mode. When the energy storage circuit 100 is in battery discharging priority mode, the energy storage system determines whether the output power of the photovoltaic module is greater than or equal to the user's demand. If the output power of the photovoltaic module is greater than or equal to the user's demand, the energy storage circuit 100 operates in direct mode. If the output power of the photovoltaic module is less than the user's demand, the energy storage circuit 100 operates in hybrid mode 2 within the channel shown in Figure 13. Furthermore, the energy storage circuit 100 detects the energy of the energy storage element. When the energy of the energy storage element is low, the energy storage circuit 100 enters charging mode or hybrid mode 1 within the channel shown in Figure 12 to replenish the energy of the energy storage element in a timely manner, preventing over-discharge of the energy storage element and extending the service life of the energy storage element.

[0169] In one example, the energy storage circuit 100 can interact with the second controller 240 via the first controller 160 to identify the output power of the inverter 200 to determine whether the user has an electricity demand, or whether the output power of the photovoltaic module is greater than or equal to the user's demand. Furthermore, when the energy storage element's power is low, the first controller 160 can control the inverter 200 to stop outputting power, causing the energy storage circuit 100 to enter a charging mode, or reduce the output power of the inverter 200, causing the energy storage circuit 100 to enter a channel-in-mix mode 1, allowing the power output of the photovoltaic module to flow into the energy storage element and replenish it in a timely manner.

[0170] The first mode switch, the second mode switch, and the third mode switch can all be any switch capable of inputting a high-level or low-level signal to the first controller 160, such as any type of switch: a physical switch, a software switch set on the screen, etc. The first mode switch, the second mode switch, and the third mode switch can be the same or different, and this embodiment of the application does not limit this.

[0171] This application also provides an electronic device, which includes an energy storage element and an energy storage system.

[0172] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0173] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An energy storage circuit (100), characterized in that, include: N capacity modules (170), N first DC / DC converters (110), N path units (130), and a first controller (160); where N is an integer greater than or equal to 2; The capacity module (170) is electrically connected to the energy storage element through the corresponding first DC / DC converter (110) and the corresponding path unit (130); the first controller (160) is electrically connected to the first DC / DC converter (110) and the path unit (130); The first controller (160) is configured to control the energy storage module (170) to charge the energy storage element through the corresponding first DC / DC converter (110) and the corresponding path unit (130) when the path unit (130) is turned on, or the energy storage element to output electrical energy through the corresponding path unit (130); and the energy storage module (170) to output electrical energy through the corresponding first DC / DC converter (110) when the path unit (130) is turned off.

2. The energy storage circuit (100) according to claim 1, characterized in that, The path unit (130) includes: at least one first switch (131); the at least one first switch (131) is connected in series to form a series structure, one end of the series structure is electrically connected to the corresponding first DC / DC converter (110), and the other end of the series structure is electrically connected to the energy storage element.

3. The energy storage circuit (100) according to claim 1, characterized in that, The first DC / DC converter (110) includes: a plurality of first DC / DC conversion units (111); The multiple DC / DC conversion units (111) are connected in parallel.

4. The energy storage circuit (100) according to claim 1, characterized in that, The energy storage circuit (100) further includes: N first output terminals (181) and second output terminals (182); The positive output terminal of the first DC / DC converter (110) is electrically connected to the corresponding first output terminal (181); The negative output terminal of the first DC / DC converter (110) is electrically connected to the second output terminal (182).

5. The energy storage circuit (100) according to claim 1, characterized in that, The first DC / DC converter (110) includes: a second switch (113), a third switch (114), an inductor (115), a first capacitor (116), a second capacitor (117), a fourth switch (118), and a fifth switch (119); One end of the second switch (113) is electrically connected to the positive input terminal of the first DC / DC converter (110); One end of the third switch (114) is electrically connected to the positive output terminal of the first DC / DC converter (110); One end of the inductor (115) is electrically connected to the other end of the second switch (113), and the other end of the inductor (115) is electrically connected to the other end of the third switch (114); One end of the first capacitor (116) is electrically connected to the positive input terminal of the first DC / DC converter (110), and the other end of the first capacitor (116) is electrically connected to the negative input terminal of the first DC / DC converter (110). One end of the second capacitor (117) is electrically connected to the positive output terminal of the first DC / DC converter (110), and the other end of the second capacitor (117) is electrically connected to the negative output terminal of the first DC / DC converter (110). One end of the fourth switch (118) is electrically connected to one end of the inductor (115), and the other end of the fourth switch (118) is electrically connected to the negative input terminal of the first DC / DC converter (110). One end of the fifth switch (119) is electrically connected to the other end of the inductor (115), and the other end of the fifth switch (119) is electrically connected to the other end of the fourth switch (118) and the negative output terminal of the first DC / DC converter (110).

6. The energy storage circuit (100) according to claim 5, characterized in that, When the energy storage circuit (100) is in charging mode, all channels where the path unit (130) is located are in charging mode; when the channel where the path unit (130) is located is in charging mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160).

7. The energy storage circuit (100) according to claim 5, characterized in that, When the energy storage circuit (100) is in discharge mode, all channels where the path unit (130) is located are in discharge mode; when the channel where the path unit (130) is located is in discharge mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118) and the fifth switch (119) are all continuously turned off.

8. The energy storage circuit (100) according to claim 5, characterized in that, When the energy storage circuit (100) is in the through mode, all channels where the path unit (130) is located are in the through mode; when the channel where the path unit (130) is located is in the through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously connected, and the fourth switch (118) and the fifth switch (119) are continuously disconnected.

9. The energy storage circuit (100) according to claim 5, characterized in that, When the energy storage circuit (100) is in the channel mixing mode, all channels where the path unit (130) is located are in the channel mixing mode; when the channel where the path unit (130) is located is in the channel mixing mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160).

10. The energy storage circuit (100) according to claim 5, characterized in that, When the energy storage circuit (100) is in the inter-channel mixing mode, there are at least two channels with different current modes; wherein, the channel modes include charging mode, intra-channel mixing mode, discharging mode and through mode; When the channel where the path unit (130) is located is in charging mode / in-channel mixed mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are turned on or off in response to the control of the first controller (160); When the channel where the path unit (130) is located is in discharge mode, the path unit (130) is continuously turned on, and the second switch (113), the third switch (114), the fourth switch (118) and the fifth switch (119) are all continuously turned off; When the channel where the path unit (130) is located is in the through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously connected, and the fourth switch (118) and the fifth switch (119) are continuously disconnected.

11. The energy storage circuit (100) according to any one of claims 1 to 10, characterized in that, The first controller (160) includes: A first sampling unit (162) is electrically connected to at least one of the first DC / DC converter (110), the path unit (130), and the energy storage element; the first sampling unit (162) is used to sample and obtain a first electrical parameter; the first electrical parameter includes at least one of the following: voltage, current, temperature, and smoke. A first control unit (163) is electrically connected to the first sampling unit (162); the first control unit (163) is used to execute a control strategy according to the first electrical parameters to output a first control signal; The first driving unit (161) is electrically connected to the first control unit (163), the first DC / DC converter (110), and the path unit (130). The first driving unit (161) is used to perform level conversion on the first control signal output by the first control unit (163) to drive the first DC / DC converter (110) to work, and to drive the path unit (130) to be turned on or off.

12. An energy storage system, characterized in that, The energy storage system includes: an energy storage circuit (100) as described in any one of claims 1 to 11 and an inverter (200); The energy storage circuit (100) is electrically connected to the inverter (200); The output terminal of the inverter (200) is used to connect to the load, and the inverter (200) is used to convert the DC power output by the energy storage circuit (100) into AC power.

13. The energy storage system according to claim 12, characterized in that, The inverter (200) includes: N second DC / DC converters (210), DC / AC converters (230), and a second controller (240); The positive input terminal of the second DC / DC converter (210) is electrically connected to the corresponding first output terminal (181) of the energy storage circuit (100); the negative input terminal of the second DC / DC converter (210) is electrically connected to the second output terminal (182) of the energy storage circuit (100); the output terminal of the second DC / DC converter (210) is electrically connected to the DC / AC converter (230); the output terminal of the DC / AC converter (230) is used to connect a load. The second controller (240) is electrically connected to the second DC / DC converter (210) and the DC / AC converter (230) and is used to control the operation of the second DC / DC converter (210) and the DC / AC converter (230).

14. The energy storage system according to claim 13, characterized in that, The second controller (240) includes: A second sampling unit (242) is electrically connected to at least one of the second DC / DC converter (210) and the DC / AC converter (230); the second sampling unit (242) is used to sample and obtain a second electrical parameter; the second electrical parameter includes at least one of the following: voltage, current, temperature, and smoke. The second control unit (244) is electrically connected to the second sampling unit (242); the second control unit (244) is used to execute a control strategy according to the second electrical parameters to output a second control signal; The second drive unit (241) is electrically connected to the second control unit (244), the second DC / DC converter (210), and the DC / AC converter (230). The second drive unit (241) is used to perform level conversion on the second control signal output by the second control unit (244) to drive the second DC / DC converter (210) and / or the DC / AC converter (230) to work.

15. The energy storage system according to claim 13 or 14, characterized in that, The first controller (160) further includes: a first communication unit (164); the second controller (240) further includes: a second communication unit (243); The first controller (160) and the second controller (240) establish a communication connection through the first communication unit (164) and the second communication unit (243) so that the first controller (160) can perform power control and / or status monitoring on the inverter (200).

16. An electronic device, characterized in that, include: Energy storage element, and energy storage system as described in any one of claims 12 to 15.

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