Energy storage circuit, energy storage system and electronic equipment

Abstract

The utility model provides an energy storage circuit, an energy storage system and electronic equipment. The circuit comprises N energy generation modules, N first DC / DC converters, N path units and a first controller, n is an integer greater than or equal to 2; the energy generation modules are electrically connected with the energy storage elements through the corresponding first DC / DC converters and the corresponding path units; the first controller is electrically connected with the first DC / DC converter and the path unit; the first controller is used for controlling the energy generation module to charge the energy storage element through the corresponding first DC / DC converter and the corresponding path unit when the path unit is switched on, or the energy storage element outputs electric energy through the corresponding path unit; and when the path units are disconnected, the power generation modules output electric energy through the corresponding first DC / DC converters. According to the circuit, the discharge efficiency of the energy storage element is improved, the working modes of the energy storage circuit are enriched, and the working requirements in different scenes are met.

Description

Technical Field

[0001] This application relates to photovoltaic energy storage technology, and in particular to an energy storage circuit, an energy storage system, and an electronic device. Background Art

[0002] With the increasing development of photovoltaic technology, photovoltaic power generation has been more and more widely used. Taking the micro balcony energy storage scenario as an example, a micro-inverter can convert the DC voltage generated by photovoltaic modules into AC power for users. However, the electric energy generated by photovoltaic modules is affected by factors such as weather and light intensity, and the power fluctuation is large, making it difficult to maintain stable output, and the user experience is not good.

[0003] Currently, on the basis of the original micro-inverter, by adding a first direct current / direct current converter (DC / DC), the electric energy generated by the photovoltaic module is stored in the battery module, and then the electric energy in the battery module is provided to the micro-inverter for users to use when needed, improving the stability of the power output. The above circuit supports limited working modes, such as charging and discharging or direct-through output, which is not flexible enough to meet the actual usage needs of users. Summary of the Utility Model

[0004] 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 to meet the actual usage needs of users.

[0005] In a first aspect, this application provides an energy storage circuit (100), including: N energy production modules (170), N first direct current / direct current converters (110), N path units (130), and a first controller (160); where N is an integer greater than or equal to 2;

[0006] The energy production module (170) is electrically connected to the energy storage element through the corresponding first direct current / direct current converter (110) and the corresponding path unit (130); the first controller (160) is electrically connected to the first direct current / direct current converter (110) and the path unit (130);

[0007] The first controller (160) is configured to, when controlling the path unit (130) to conduct, charge the energy storage element by the energy production module (170) through the corresponding first direct current / direct current converter (110) and the corresponding path unit (130), or output electric energy by the energy storage element through the corresponding path unit (130); and when the path unit (130) is disconnected, output electric energy by the energy production module (170) through the corresponding first direct current / direct current converter (110).

[0008] 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.

[0009] Optionally, the first DC / DC converter (110) includes: a plurality of first DC / DC conversion units (111);

[0010] The plurality of DC / DC conversion units (111) are connected in parallel.

[0011] Optionally, the energy storage circuit (100) further includes: N first output terminals (181), a second output terminal (182);

[0012] The positive output terminal of the first DC / DC converter (110) is electrically connected to the corresponding first output terminal (181);

[0013] The negative output terminal of the first DC / DC converter (110) is electrically connected to the second output terminal (182).

[0014] 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), a fifth switch (119);

[0015] One end of the second switch (113) is electrically connected to the positive input terminal of the first DC / DC converter (110);

[0016] One end of the third switch (114) is electrically connected to the positive output terminal of the first DC / DC converter (110);

[0017] 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);

[0018] 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);

[0019] 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);

[0020] 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).

[0021] 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).

[0022] Optionally, when the energy storage circuit (100) is in the charging mode, the channels where the path unit (130) is located are all in the charging mode; when the channels where the path unit (130) is located are in the charging mode, the path unit (130) is continuously conducting, 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).

[0023] Optionally, when the energy storage circuit (100) is in the discharging mode, the channels where the path unit (130) is located are all in the discharging mode; when the channels where the path unit (130) is located are in the discharging mode, the path unit (130) is continuously conducting, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are all continuously turned off.

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

[0025] Optionally, when the energy storage circuit (100) is in the in-channel hybrid mode, the channels where the path unit (130) is located are all in the in-channel hybrid mode; when the channels where the path unit (130) is located are in the in-channel hybrid mode, the path unit (130) is continuously conducting, 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).

[0026] Optionally, when the energy storage circuit (100) is in the inter-channel hybrid mode, the current modes of at least two channels are different; wherein, the modes of the channels include a charging mode, an intra-channel hybrid mode, a discharging mode, and a direct-through mode;

[0027] When the channel where the path unit (130) is located is in the charging mode / intra-channel hybrid mode, the path unit (130) is continuously conducting, 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);

[0028] When the channel where the path unit (130) is located is in the discharging mode, the path unit (130) is continuously conducting, and the second switch (113), the third switch (114), the fourth switch (118), and the fifth switch (119) are all continuously turned off;

[0029] When the channel where the path unit (130) is located is in the direct-through mode, the path unit (130) is continuously turned off, the second switch (113) and the third switch (114) are continuously conducting, and the fourth switch (118) and the fifth switch (119) are continuously turned off.

[0030] Optionally, the first controller (160) includes:

[0031] A first sampling unit (162), 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 configured to perform sampling to obtain a first electrical parameter; the first electrical parameter includes at least one of voltage, current, temperature, and smoke;

[0032] A first control unit (163), the first control unit (163) is electrically connected to the first sampling unit (162); the first control unit (163) is configured to execute a control strategy according to the first electrical parameter to output a first control signal;

[0033] A first driving unit (161), 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 configured to perform level conversion on the first control signal output by the first control unit (163) and then drive the first DC / DC converter (110) to operate, and drive the path unit (130) to conduct or disconnect.

[0034] In a second aspect, the present application provides an energy storage system, comprising: the above-mentioned energy storage circuit (100) and an inverter (200);

[0035] The energy storage circuit (100) is electrically connected to the inverter (200);

[0036] The output end of the inverter (200) is used to connect to a load, and the inverter (200) is used to invert the direct current output by the energy storage circuit (100) into alternating current.

[0037] Optionally, the inverter (200) comprises: N second DC / DC converters (210), a DC / AC converter (230), and a second controller (240);

[0038] The positive input end of the second DC / DC converter (210) is electrically connected to the corresponding first output end (181) of the energy storage circuit (100); the negative input end of the second DC / DC converter (210) is electrically connected to the second output end (182) of the energy storage circuit (100); the output end of the second DC / DC converter (210) is electrically connected to the DC / AC converter (230); the output end of the DC / AC converter (230) is used to connect to a load;

[0039] 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).

[0040] Optionally, the second controller (240) comprises:

[0041] A second sampling unit (242), 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 perform sampling to obtain second electrical parameters; the second electrical parameters include at least one of: voltage, current, temperature, smoke;

[0042] A second control unit (244), 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.

[0043] A second driving unit (241), which is electrically connected to the second control unit (244), the second DC / DC converter (210), and the DC / AC converter (230); the second driving unit (241) is configured to perform level conversion on the second control signal output by the second control unit (244) and then drive the second DC / DC converter (210) and / or the DC / AC converter (230) to operate.

[0044] 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) performs power control and / or status monitoring on the inverter (200).

[0045] In a third aspect, the present application provides an electronic device, including: an energy storage element, and an energy storage system as described in any one of the second aspects.

[0046] The energy storage circuit, energy storage system, and electronic device provided by the present application are provided with an independent path unit between the first DC / DC converter and the energy storage element. When it is necessary to charge and discharge the energy storage element, the first DC / DC converter can store the electric energy generated by the energy production module into the energy storage element through the corresponding path unit, and the energy storage element can also directly output the stored electric energy through the corresponding path unit without passing 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 respectively, different branches can operate in different modes. When the energy storage element turns off the charge and discharge function, the electric energy generated by the energy production module can be directly output, thereby ensuring the utilization efficiency of the electric energy while enriching the working modes of the energy storage circuit and improving the flexibility of the circuit operation to meet the working requirements in different scenarios. Description of the Drawings

[0047] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0048] Figure 1 It is a schematic structural diagram of a micro energy storage system;

[0049] Figure 2 It is a schematic structural diagram of another micro energy storage system;

[0050] Figure 3 It is a schematic structural diagram of an energy storage circuit provided by an embodiment of the present application;

[0051] Figure 4 It is a schematic structural diagram of another energy storage circuit provided by an embodiment of the present application;

[0052] Figure 5 It is a schematic structural diagram of the third energy storage circuit provided by an embodiment of the present application;

[0053] Figure 6 It is a schematic structural diagram of an energy storage system provided by an embodiment of the present application;

[0054] Figure 7 It is a schematic structural diagram of another energy storage system provided by an embodiment of the present application;

[0055] Figure 8 It is a schematic diagram of the state of the first working mode of the energy storage circuit provided by an embodiment of the present application;

[0056] Figure 9 It is a schematic diagram of the state of the second working mode of the energy storage circuit provided by an embodiment of the present application;

[0057] Figure 10 It is a schematic diagram of the state of the third working mode of the energy storage circuit provided by an embodiment of the present application;

[0058] Figure 11 It is a schematic diagram of the state of the fourth working mode of the energy storage circuit provided by an embodiment of the present application;

[0059] Figure 12 It is a schematic diagram of the state of the fifth working mode of the energy storage circuit provided by an embodiment of the present application;

[0060] Figure 13 It is a schematic diagram of the state of the sixth working mode of the energy storage circuit provided by an embodiment of the present application.

[0061] Explanation of reference numerals:

[0062] 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 communication unit; 170: Power generation 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] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0064] Here, exemplary embodiments will be described in detail, and examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0065] With the increasing development of photovoltaic technology, photovoltaic power generation has been more and more widely used. Taking the micro balcony energy storage scenario as an example, a micro-inverter can convert the direct current generated by photovoltaic modules into alternating current for users to use. However, the electric energy generated by photovoltaic modules is affected by factors such as weather and light intensity, and the electric energy fluctuates greatly, making it difficult to maintain a stable output, and the user experience is not good.

[0066] Figure 1 Schematic diagram of the structure of a micro energy storage system. As Figure 1As shown, for the application scenario of two photovoltaic components, when charging is required, the first DC / DC converter 1 and the first DC / DC converter 2 respectively convert the DC power emitted by the photovoltaic component 1 and the photovoltaic component 2 into voltage, and when the charge and discharge switch unit is turned on, the electric energy emitted by the photovoltaic component is stored in the battery module. When power supply is needed, the electric energy stored in the battery module can be provided to the user through the turned-on charge and discharge switch unit, or output by the photovoltaic component through the first DC / DC converter 1 and the first DC / DC converter 2.

[0067] Figure 2 Figure 1 is a schematic diagram of the structure of another micro energy storage system. Figure 2 As shown, for 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 electric energy emitted by the photovoltaic module into the battery module through the turned-on charge and discharge switch unit. When electric energy needs to be output, photovoltaic module 1 and photovoltaic module 2 can output electric energy directly through switch 1 and switch 2 respectively, or the battery module outputs electric energy through the first DC / DC converter 1 and the first DC / DC converter 2, switch 1 and switch 2.

[0068] The working modes supported by the above schemes include charging and discharging of the battery module and output of the photovoltaic module, which are relatively limited and inflexible and cannot meet the working needs in different practical scenarios. In addition, in the second scheme, since the first DC / DC converter will have energy loss when performing voltage conversion, it will also cause the battery module to reduce the efficiency of electric energy utilization when outputting electric energy.

[0069] Therefore, how to optimize the working mode of the energy storage circuit and improve its flexibility is a technical problem that needs to be solved urgently.

[0070] In view of this, the present application proposes an energy storage circuit, in which each first DC / DC converter is connected to an energy storage element through an independent path unit, and each path supports charging and discharging of the energy storage element. When the first DC / DC converter needs to store the electric energy emitted 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 electric energy through the corresponding path unit without passing 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, thereby enriching the working mode of the energy storage circuit, improving the flexibility of the circuit operation, and meeting the working requirements in different scenarios.

[0071] The energy storage circuit proposed in this application is applicable to an energy storage system and can also be used in any energy storage system for storing the electric energy generated by a power generation module. In this embodiment of the application, a micro-inverter system is taken as an example for illustration.

[0072] The following uses specific embodiments to elaborate in detail on how this application stores electric energy. These several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below in conjunction with the accompanying drawings.

[0073] Figure 3 It is a schematic structural diagram of an energy storage circuit provided by an embodiment of this application. As Figure 3 shown, 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 power generation 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 Figure 3 is not shown.

[0075] The power generation module 170 is any module that can generate electric energy, such as a photovoltaic module, a wind turbine generator, a hydroelectric generator, etc. It should be understood that the power generation module 170 can be integrally provided with other structures of the energy storage circuit 100 or can be implemented as a separate device independent of other structures in the energy storage circuit 100. The embodiments of this application do not limit this. Figure 3 Taking the integrated method as an example for illustrative description.

[0076] The energy storage element is any element that can store electric energy and release electric energy when needed, such as a battery module. It should be understood that the energy storage element can be integrally provided with other structures of the energy storage circuit 100 or can be implemented as a separate device independent of other structures in the energy storage circuit 100. The embodiments of this application do not limit this. Figure 3 Taking the independent method as an example for illustrative description.

[0077] The first DC / DC converter 110 can be, for example, any device that converts an input DC voltage into a required DC voltage for output. For example, it can be any one of a DC boost converter, a DC buck converter, etc. The first DC / DC converter 110 may include a direct current direct current (DC / DC) conversion unit 111, or may include multiple DC / DC conversion units 111, which is specifically related to the circuit structure of the first DC / DC converter 110. Further, the first DC / DC converter 110 has a maximum power point tracking (MPPT) function, which detects the generated voltage of the photovoltaic module in real time and tracks the highest voltage and current values of the output to output the maximum power. For how to implement the MPPT function of the first DC / DC converter 110, reference can be made to the description of the prior art, and this embodiment of the present application will not elaborate on it.

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

[0079] The first controller 160 can be, for example, any module that can output a control signal such as a high level or a low level. For example, it can be any processing unit such as a single-chip microcomputer, an embedded processor, a programmable logic device, etc. Optionally, in addition to the processing unit, it can also include the peripheral circuit unit of the processing unit.

[0080] The first controller 160 is used to control the first DC / DC converter 110 and the path unit 130 to implement different working modes. For example, for each path unit 130, when controlling the path unit 130 to be turned off, the power generation module 170 can output electric energy through the corresponding first DC / DC converter 110, and when controlling the path unit 130 to be 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 outputs electric energy through the corresponding path unit 130. Since the path units 130 corresponding to each first DC / DC converter 110 are independently controlled, the branches corresponding to each first DC / DC converter 110 can independently be in their required working modes. For example, the energy storage element corresponding to the first DC / DC converter 110 can be charged / discharged, or the first DC / DC converter 110 directly outputs, so that the entire energy storage circuit 100 can implement more working modes.

[0081] It should be understood that the first controller 160 can be integrally provided with other structures in the energy storage circuit 100, or can be implemented as a separate device independent of other structures in the energy storage circuit 100.Figure 3 Illustrative description is given by taking the integrated manner as an example.

[0082] In summary, by providing an independent path unit between the first DC / DC converter and the energy storage element, when the energy storage element needs to be charged or discharged, the first DC / DC converter can store the electric 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 electric energy through the corresponding path unit without passing 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 provided, different branches can operate in different modes. When the energy storage element turns off the charge and discharge function, the electric energy generated by the power generation module can be directly output, thereby ensuring the efficiency of direct utilization of the power generation of the power generation module while enriching the working modes of the energy storage circuit, improving the flexibility of the circuit operation, and meeting the working requirements in different scenarios.

[0083] Figure 4 FIG. is a schematic structural diagram of another energy storage circuit provided by an embodiment of the present application. As Figure 4 shown, the path unit 130 includes: at least one first switch 131; 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.

[0084] The first switch 131 can be, for example, any switch that conducts based on a high level or a low level. For example, a triode, a metal-oxide-semiconductor field-effect transistor (MOSFET), also known as a MOS tube, a thyristor, etc. The types of the first switches 131 in the same path unit 130 can be the same or different. The types of the first switches 131 in different path units 130 can be the same or different. For example, the path unit 130 can be formed by connecting at least one triode in series, or by connecting a triode and a MOS tube in series, or by connecting at least one MOS tube in series, or one path unit 130 is formed by connecting at least one triode in series and another path unit 130 is formed by connecting at least one MOS tube in series. The embodiments of the present application do not limit this.

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

[0086] Correspondingly, the first controller 160 is specifically configured to control the first switch 131 to be in an on state or an off state. For example, the first controller 160 can control by outputting a high-level or low-level signal to the first switch 131. Among them, when the series-connected first switch 131 is in an on state, the path unit 130 is turned on, and when the series-connected first switch 131 is in an off state, the path unit 130 is turned off.

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

[0088] Optionally, the energy storage circuit 100 further includes: N first output terminals 181, a second output terminal 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 plurality of first DC / DC converters 110 are all electrically connected to the second output terminal 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 pole “+” of the power generation module 170, and the negative input terminal of the first DC / DC converter 110 is electrically connected to the negative pole “-” of the power generation module 170; the other end of the path unit 130 is electrically connected to the positive pole “+” of the energy storage element, and the negative pole “-” of the energy storage element is electrically connected to the negative output terminals of the plurality of first DC / DC converters 110 and the second output terminal 182.

[0090] Further, the first controller 160 includes: a first sampling unit 162, a first control unit 163, and a first driving 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 configured to perform sampling to obtain a first electrical parameter; the first electrical parameter includes at least one of 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 configured 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 operation of the energy storage element and output a control signal for disconnecting the path unit 130; alternatively, the first control unit 163 can control the operation of the first DC / DC converter 110 according to the output voltage and current values of the first DC / DC converter 110 to output maximum power, etc.; or, when abnormal smoke appears in the energy storage circuit 100, stop the operation of the energy storage circuit 100 according to the smoke parameter. 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 configured to perform level conversion on the first control signal output by the first control unit 163 and then drive the first DC / DC converter 110 to operate, and drive the path unit 130 to conduct or disconnect. The first controller 160 can control the energy storage circuit 100 to be in a normal operating state. The connection relationship between the first controller 160, the first DC / DC converter 110, the path unit 130, and the energy storage element, Figure 4 is not shown.

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

[0092] Figure 5 FIG. 9 is a schematic structural diagram of a third energy storage circuit provided by an embodiment of the present application. As Figure 5 shown, 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; 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.

[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 be turned on or off, so that the first DC / DC converter 110 outputs a voltage value matching the connection circuit. The first controller 160 can control the second switch 113 and the third switch 114 to be turned on, and the fourth switch 118 and the fifth switch 119 to be turned off, so that the first DC / DC converter 110 directly outputs the voltage value output by the power generation 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, which can make the channel where any path unit 130 is located in different working modes. The energy storage circuit 100 includes multiple channels. By controlling the working modes of each channel, the energy storage circuit 100 can be in different working modes. The working modes of the energy storage circuit 100 will be described below.

[0097] (1) Charging mode

[0098] When the energy storage circuit 100 is in the charging mode, all the channels where the path unit 130 is located are in the charging mode. When the channels where the path unit 130 is located are in the charging mode, the path unit 130 is continuously conducting, 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; the first DC / DC converter 110 converts the DC voltage output by the power generation module 170 to output a voltage value matching the connection 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 electric energy generated by the power generation module 170 in the energy storage element without outputting electric energy to the user, and can realize the storage of electric energy.

[0099] (II) Discharging mode

[0100] When the energy storage circuit 100 is in the discharging mode, all the channels where the path unit 130 is located are in the discharging mode. When the channels where the path unit 130 is located are in the discharging mode, the path unit 130 is continuously conducting, and the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 are all continuously turned off. The energy storage element can output the stored electric energy through the path unit 130, and the power generation module 170 stops outputting electric energy through the first DC / DC converter 110. The energy storage element outputs the stored electric energy through the corresponding path unit 130 for the user to use, and can output electric energy through the energy storage element to meet the user's power consumption requirements when the power generation module 170 and / or the first DC / DC converter 110 fails and does not output electric energy.

[0101] (III) Through mode

[0102] When the energy storage circuit 100 is in the through mode, all the channels where the path unit 130 is located are in the through mode. When the channels where the path unit 130 is located are in the through mode, the path unit 130 is continuously turned off, the second switch 113 and the third switch 114 are continuously conducting, and the fourth switch 118 and the fifth switch 119 are continuously turned off; the first DC / DC converter 110 does not perform voltage conversion on the DC voltage output by the power generation module 170, and directly outputs the voltage value output by the power generation module 170. Since there is energy loss when the first DC / DC converter 110 performs voltage conversion, directly outputting the voltage value output by the power generation module 170 in the through mode can improve the direct utilization efficiency of the power generation of the power generation module 170.

[0103] (IV) Inter-channel hybrid mode

[0104] When the energy storage circuit 100 is in the inter-channel hybrid mode, the current modes of at least two channels are different. Among them, the mode of a channel may include a charging mode, an intra-channel hybrid mode, a discharging mode, and a direct-through mode.

[0105] When the channel where the path unit 130 is located is in the charging mode / intra-channel hybrid 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 the path unit 130 is located is in the discharging 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;

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

[0108] In an example: a part of the first DC / DC converter 110 operates in the direct-through mode, and another part of the channels operate in the charging mode. When the light is strong, the electric energy generated by a part of the channels can meet the user's power consumption needs, and the battery is not fully charged. At this time, the energy storage circuit 100 can directly output the electric energy generated by the energy production module 170 through a part of the channels for the user to use, and charge the battery with the electric energy generated by the energy production module 170 through another part of the channels to store the excess electric energy. When the channel is in the direct-through mode and when the channel is in the charging mode, the states of the path unit 130, and the second switch 113, the third switch 114, the fourth switch 118, and the fifth switch 119 can refer to the foregoing description, and will not be elaborated here.

[0109] In an example: a part of the first DC / DC converter 110 operates in the direct-through mode, and another part of the channels operate in the discharging mode. For example, the energy storage circuit 100 can directly output the electric energy generated by the energy production module 170 through a part of the channels for the user to use, and output the electric energy stored in the energy storage element to the user through another part of the channels. When the light is weak, the energy storage circuit 100 can meet the user's power consumption needs by combining the output of the electric energy from the energy storage element and the direct output of the electric energy from a part of the channels.

[0110] In an example: A part of the first DC / DC converter 110 operates in a through mode, and another part of the channel operates in an in-channel hybrid mode. For example, a part of the channels of the energy storage circuit 100 directly output the electric energy generated by the energy production module 170 for user use, and another part of the channels output the electric energy after voltage conversion through the first DC / DC converter 110. The energy storage element outputs the stored electric energy through the corresponding path unit 130. In the case of weak light, the energy storage circuit 100 can use a combination of outputting electric energy through the energy storage element in some channels and outputting electric energy through voltage conversion by the first DC / DC converter 110 in some channels, and directly outputting electric energy in some channels to meet the user's power consumption requirements.

[0111] In summary, since the path units between the first DC / DC converter and the energy storage element are independently set respectively, different channels of the energy storage circuit can operate in different modes, thus ensuring the efficiency of direct utilization of the electric energy generated by the energy production module while improving the flexibility of the circuit operation and meeting the working requirements in different scenarios.

[0112] (V) In-channel hybrid mode

[0113] When the energy storage circuit 100 is in the in-channel hybrid mode, the channels where the path unit 130 is located are all in the in-channel hybrid mode. When the channels where the path unit 130 is located are in the in-channel hybrid mode, the path unit 130 is continuously conducting, 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. The first DC / DC converter 110 performs voltage conversion on the DC voltage output by the energy production module 170 to output a voltage value matching the connected circuit. According to different user power consumption requirements, the in-channel hybrid mode can also be any one of: in-channel hybrid mode 1, in-channel hybrid mode 2.

[0114] (1) When the energy storage circuit 100 is in the in-channel hybrid mode 1, all channels are in the in-channel hybrid mode 1. When the channels where the path unit 130 is located are in the in-channel hybrid mode 1, the path unit 130 is continuously conducting, 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. The energy production module 170 can output electric 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 power consumption requirement is less than the electric energy generated by the energy production module 170, it can meet the user's power consumption requirement and store the excess electric energy to output the stored electric energy to the user for use when needed.

[0115] (2) When the energy storage circuit 100 is in the in-channel hybrid mode 2, all channels are in the in-channel hybrid mode 2. When the channel where the path unit 130 is located is in the in-channel hybrid mode 2, the path unit 130 is continuously conducting, 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. The power generation module 170 can output electrical energy through the first DC / DC converter 110, and the energy storage element can also output the stored electrical energy through the corresponding path unit 130. When the user's power consumption demand is greater than 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 power consumption demand.

[0116] In summary, since the path units between the first DC / DC converter and the energy storage element are independently set respectively, the energy storage circuit can operate in different modes, thus ensuring the efficiency of direct utilization of the electrical energy generated by the power generation module, enriching the working modes of the energy storage circuit, improving the flexibility of the circuit operation, and meeting the working requirements in different scenarios.

[0117] Figure 6 This is a schematic structural diagram of an energy storage system provided by an embodiment of the present application. As Figure 6 shown, the energy storage system includes an energy storage circuit 100 and an inverter 200; the energy storage circuit 100 is electrically connected to the inverter 200; the output end of the inverter 200 is used to connect to a load, and the inverter 200 is used to invert the direct current output by the energy storage circuit 100 into alternating current.

[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, and then provide the electrical energy in the energy storage element to the inverter 200 to be converted into alternating current for user use when needed, improving the stability of the electrical energy output.

[0119] The inverter 200 includes: N second DC / DC converters 210, a DC / AC converter 230, and a second controller 240; the positive input end of the second DC / DC converter 210 is electrically connected to the corresponding first output end 181 of the energy storage circuit 100; the negative input end of the second DC / DC converter 210 is electrically connected to the second output end 182 of the energy storage circuit 100; the output end of the second DC / DC converter 210 is electrically connected to the DC / AC converter 230; the output end of the DC / AC converter 230 is used to connect to a 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, for example, any device that converts the input DC voltage into the required DC voltage for output. For example, it can be any one of: a DC boost converter, a DC buck converter, etc. The second DC / DC converter 210 may include a DC / DC conversion unit or may include multiple DC / DC conversion units, which is specifically related to the circuit structure of the second DC / DC converter. The second DC / DC converter 210 has the MPPT function and modulates the input direct current into a steamed bun wave with a sine law. For how to implement the MPPT function of the second DC / DC converter 210, reference can be made to the description of the prior art, and this application embodiment will not elaborate on it anymore.

[0121] The DC / AC converter 230 can be, for example, any device that inversely converts the input DC voltage into an alternating current. The DC / AC converter 230 is used to inversely convert the steamed bun wave modulated by the second DC / DC converter 210 into a sine wave that meets the user's requirements for the user to use.

[0122] The second controller 240 can be, for example, any module that can trigger its output signal based on a high level or a low level. For example, it can be any processing unit such as a single-chip microcomputer, an embedded processor, a programmable logic device, etc. Optionally, in addition to the processing unit, it may also include the peripheral circuit unit of 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 inversely convert the electricity generated by the power generation module 170 and / or the direct current stored in the energy storage element into an alternating current 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, Figure 6 is not shown.

[0123] Further, the second controller 240 includes: a second sampling unit 242, a second control unit 244, and a second driving 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 configured to perform sampling to obtain second electrical parameters; the second electrical parameters include at least one of: 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 configured to execute a control strategy according to the second electrical parameters 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, when the temperature of the DC / AC converter 230 exceeds a preset temperature, the second control unit 244 can control the DC / AC converter 230 to stop operating; or, when abnormal smoke appears in the inverter 200, the second control unit 244 can stop the operation of the inverter 200 according to the smoke parameters. The second driving 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 driving unit 241 is configured to perform level conversion on the control signal output by the second control unit 244 and then drive the second DC / DC converter 210 and / or the DC / AC converter 230 to operate. The second controller 240 can control the inverter 200 to be in a normal operating state.

[0124] Further, 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 via 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 electric energy of the production capacity module can flow into the energy storage element, realizing the controllability of charging the energy storage element.

[0125] In summary, for the energy storage system according to the embodiments of the present application, by providing an independent path unit between the first DC / DC converter and the energy storage element in the energy storage circuit, when the energy storage element needs to be charged or discharged, the first DC / DC converter can store the electric 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 electric energy through the corresponding path unit without passing 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 provided, different branches can operate in different modes, thus ensuring the efficiency of direct utilization of the power generation of the power generation module while enriching the working modes of the energy storage circuit and improving the flexibility of the circuit operation to meet the working requirements in different scenarios. When a failure occurs in 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, the influence on the remaining channels can be avoided, improving the reliability of the system.

[0126] Taking the scenario where the power generation module 170 is two photovoltaic modules as an example, the structure of the energy storage system will be described below.

[0127] Figure 7 It is a schematic structural diagram of another energy storage system provided by the embodiments of the present application. As Figure 7 shown, 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 description, in the following embodiments, the photovoltaic module 1 is labeled as 1701, the photovoltaic module 2 is labeled as 1702, the first DC / DC converter 1 is labeled as 1101, the first DC / DC converter 2 is labeled as 1102, the path unit 1 is labeled as 1301, the path unit 2 is labeled as 1302, the second DC / DC converter 1 is labeled as 2101, and the 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 electrode PV1+ of the photovoltaic module 1701, the negative input terminal of the first DC / DC converter 1101 is electrically connected to the negative electrode PV1- of the photovoltaic module 1701, and 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 electrode PV2+ of the photovoltaic module 1702, the negative input terminal of the first DC / DC converter 1102 is electrically connected to the negative electrode PV2- of the photovoltaic module 1702, and 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 electrode 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 negative input terminal PV1- of the first DC / DC converter 1101; 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 to the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4, the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4 are turned on; when 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, the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4 are turned off. The first controller 160 can control the first DC / DC converter 1101 to output a voltage value matching the connected circuit by controlling the conduction or disconnection of the second switch Q1, the third switch Q3, the fourth switch Q2, and the fifth switch Q4. The first controller 160 can control the first DC / DC converter 1101 to directly output the voltage value output by the photovoltaic module 1 by controlling the conduction of the second switch Q1 and the third switch Q3 and the disconnection of the fourth switch Q2 and the fifth switch Q4.

[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 electrode 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 C3 is electrically connected to the negative input terminal PV2- of the first DC / DC converter 1102; 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 to the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8, the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8 are turned on; when the first controller 160 sends a low level to the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8, the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8 are turned off. The first controller 160 can control the first DC / DC converter 1102 to output a voltage value matching the connection circuit by controlling the conduction or disconnection of the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8. The first controller 160 can control the first DC / DC converter 1102 to directly output the voltage value output by the photovoltaic module 2 by controlling the second switch Q5 and the third switch Q7 to be turned on and the fourth switch Q6 and the fifth switch Q8 to be turned off.

[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 electrode 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 through the first drive unit 161. The first control unit 163 and the above connection relationships Figure 7 are not shown.

[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 to be electrically connected to a 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 second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 to work, and can invert the electricity generated by the photovoltaic module 1701 and / or the photovoltaic module 1702 and / or the direct current stored in the energy storage element into alternating current that meets the requirements of the electrical load. The connection relationships between the second controller 240 and the second DC / DC converter 2101, the second DC / DC converter 2102, and the DC / AC converter 230 Figure 7 are not shown.

[0137] Continuing with Figure 7 the scenario of the two photovoltaic modules shown as an example, the following describes how the energy storage circuit stores the electric energy generated by the photovoltaic module into the energy storage element, or outputs the electric energy stored in the energy storage element, or directly outputs the electric energy generated by the photovoltaic module to the inverter.

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

[0139] The following describes the working principle of the energy storage circuit 100 working in the charging mode.

[0140] Figure 8 This is a state schematic diagram of the first working mode of the energy storage circuit provided by the embodiment of the present application. As Figure 8As shown, the energy storage circuit 100 operates in the charging mode, and the arrow directions in the figure indicate the flow directions of electrical signals. 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; the first controller 160 sends high levels to the first switches Q11 and Q12, the first switches Q11 and Q12 are turned on, the path unit 1301 is turned on, and a charging path is formed between the first DC / DC converter 1101 and the energy storage element, so as to store the electric 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 that matches the energy storage element; the first controller 160 sends high levels to the first switches Q9 and Q10, the first switches Q9 and Q10 are turned on, the path unit 1302 is turned on, and a charging path is formed between the first DC / DC converter 1102 and the energy storage element, so as to store the electric 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 use the MPPT function to enable the photovoltaic module 1701 and the photovoltaic module 1702 to charge the energy storage element at the 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 how to control 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 are related to the magnitudes of the output voltages of the photovoltaic module 1701 and the photovoltaic module 1702 and the circuit structures of the first DC / DC converter 1101 and the first DC / DC converter 1102. For specific details, reference can be made to the description of the prior art, and this application will not elaborate further. The first controller 160, Figure 8 is not shown.

[0142] The working principle of the energy storage circuit 100 operating in the discharging mode will be described below.

[0143] Figure 9 is a state schematic diagram of the second working mode of the energy storage circuit provided by the embodiment of the present application. As Figure 9 shown, the energy storage circuit 100 operates in the discharging mode, and the arrow directions in the figure indicate the flow directions of electrical signals.

[0144] The first controller 160 sends a high level to the first switches Q11 and Q12. The first switches Q11 and Q12 are turned on, and the path unit 1301 is turned on, 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. The first DC / DC converter 1101 stops working, disconnecting the path between the photovoltaic module 1701 and the first output terminal P1+, realizing the output of the electric 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 to the first switches Q9 and Q10. The first switches Q9 and Q10 are turned on, and the path unit 1302 is turned on, forming a discharge path between the energy storage element and the first output terminal P2+. The first controller 160 sends a low level to the second switch Q5, the third switch Q7, the fourth switch Q6, and the fifth switch Q8. The first DC / DC converter 1102 stops working, disconnecting the path between the photovoltaic module 1702 and the first output terminal P2+, realizing the output of the electric energy stored in the energy storage element 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 invert the direct current output by the energy storage element into alternating current for user use. At the same time, the first controller 160 controls the magnitude of the power output of the energy storage element through communication with the inverter 200. The first controller 160 and the second controller 240, Figure 9 not shown.

[0145] When the charge and discharge function of the energy storage element is not used in the energy storage circuit 100, for example, in any of the following cases: the energy storage element is full, the energy storage element fails, or the energy storage element is forcibly disconnected. The energy storage circuit 100 can also operate in a through mode. The working principle of the energy storage circuit 100 operating in the through mode is described below.

[0146] Figure 10 It is a state schematic diagram of the third energy storage circuit working mode provided by the embodiment of the present application. As Figure 10 shown, the energy storage circuit 100 operates in the through mode, and the arrow direction in the figure indicates the flow direction of the electrical signal.

[0147] The first controller 160 sends a low level to the first switches Q11 and Q12, the first switches Q11 and Q12 turn off, the path unit 1301 turns off, and the path between the first DC / DC converter 1101 and the energy storage element is disconnected; the first controller 160 sends a low level to the first switches Q9 and Q10, the first switches Q9 and Q10 turn off, the path unit 1302 turns off, and the path between the first DC / DC converter 1102 and the energy storage element is disconnected. The first controller 160 sends a high level to the second switch Q1 and the third switch Q3, the second switch Q1 and the third switch Q3 turn on, the first controller 160 sends a low level to the fourth switch Q2 and the fifth switch Q4, the fourth switch Q2 and the fifth switch Q4 turn off, forming a direct connection path from the photovoltaic module 1701 through the second switch Q1, the inductor L1 and the third switch Q3 to the first output terminal P1+, and the electric 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, the second switch Q5 and the third switch Q7 turn on, the first controller 160 sends a low level to the fourth switch Q6 and the fifth switch Q8, the fourth switch Q6 and the fifth switch Q8 turn off, forming a direct connection path from the photovoltaic module 1702 through the second switch Q5, the inductor L2 and the third switch Q7 to the first output terminal P2+, and the electric energy output by the photovoltaic module 1702 is directly sent 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 invert the direct current sent by the photovoltaic module 1701 and the photovoltaic module 1702 into alternating current for user use. In one example, the second DC / DC converter 2101 and the second DC / DC converter 2102 use the MPPT function to invert the alternating current at the maximum power for user use. The first controller 160 and the second controller 240, Figure 10 are not shown.

[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 the inter-channel hybrid mode when the light is strong, the single-channel light can meet the user's power consumption requirements, and the energy storage element is not fully charged. The working principle of the energy storage circuit 100 operating in the inter-channel hybrid mode will be described below.

[0149] Figure 11 This is a state schematic diagram of the fourth operating mode of the energy storage circuit provided by the embodiment of the present application. As Figure 11 shown, the energy storage circuit 100 operates in the inter-channel hybrid mode, Figure 11 and is schematically described by taking one channel operating in the direct connection mode and the other channel operating in the charging mode as an example. The arrow direction in the figure indicates the flow direction of the electrical signal.

[0150] The first controller 160 can control a direct connection path to be formed between the photovoltaic module 1701 and the first output terminal P1+. The inverter 200 converts the electric energy output by the photovoltaic module 1701 into alternating current for user use, and the photovoltaic module 1702 and the energy storage element form a charging path to charge the energy storage element; alternatively, the first controller 160 can control a direct connection path to be formed between the photovoltaic module 1702 and the first output terminal P2+. The inverter 200 converts the electric energy output by the photovoltaic module 1702 into alternating current for user use, and the photovoltaic module 1701 and the energy storage element form a charging path to charge the energy storage element. How the photovoltaic module 1701 or the photovoltaic module 1702 forms a charging path with the energy storage element can refer to the foregoing description and will not be elaborated here. Figure 11 Taking the case where a direct connection path is formed between the photovoltaic module 1701 and the first output terminal P1+, and the photovoltaic module 1702 and the energy storage element form a charging path to charge the energy storage element as an example for illustrative description. The first controller 160, Figure 11 not shown.

[0151] Each channel of the energy storage circuit 100 can operate in different operating modes, and different operating modes can also be used within one channel, which is called the in-channel hybrid mode. For example, when the light is strong, the electric energy generated by one photovoltaic module is greater than the user's power consumption demand, and when the energy storage element is not fully charged, the energy storage circuit 100 can supply the electric energy generated by the photovoltaic module to the user, and the excess electric energy is stored in the energy storage element; or, when the light is weak, the sum of the electric energy generated by the two photovoltaic modules is less than the user's power consumption demand, and when the energy storage element has sufficient electric energy, the energy storage circuit 100 can supply the electric energy generated by the photovoltaic module to the user, and the insufficient electric energy is supplied to the user by controlling the energy storage element to discharge to meet the user's power consumption demand.

[0152] The following describes how the energy storage circuit 100 supplies the electric energy generated by the photovoltaic module to the user and stores the excess electric energy in the energy storage element.

[0153] In this case, the electric energy generated by the photovoltaic module 1701 can be supplied to the user, and the excess electric energy is stored in the energy storage element, and all the electric energy generated by the photovoltaic module 1702 is stored in the energy storage element; or, the electric energy generated by the photovoltaic module 1702 is supplied to the user, and the excess electric energy is stored in the energy storage element, and all the electric energy generated by the photovoltaic module 1701 is stored in the energy storage element; or, the electric energy generated by both the photovoltaic module 1701 and the photovoltaic module 1702 is supplied to the user, and both the photovoltaic module 1701 and the photovoltaic module 1702 store the excess electric energy in the energy storage element.

[0154] The following is a schematic illustration taking the case where the electric energy generated by the photovoltaic module 1701 and the photovoltaic module 1702 is provided for users, and both the photovoltaic module 1701 and the photovoltaic module 1702 store the excess electric energy in the energy storage element.

[0155] Figure 12 It is a schematic diagram of the state of the fifth working mode of the energy storage circuit provided by the embodiment of the present application. As Figure 12 shown, the energy storage circuit 100 operates in the in-channel hybrid mode 1, and the arrow directions in the figure indicate the flow directions of the electrical signals.

[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 matching 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 matching 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 operate, and converts the electric energy output by the photovoltaic module 1701 and the photovoltaic module 1702 into alternating current for users to use.

[0157] At the same time, the first controller 160 sends high levels to the first switches Q11 and Q12. The first switches Q11 and Q12 are turned on, and the path unit 1301 is turned on, forming a charging path between the first DC / DC converter 1101 and the energy storage element, and realizing storing the excess electric energy other than that provided for users by the photovoltaic module 1701 in the energy storage element. The first controller 160 sends high levels to the first switches Q9 and Q10. The first switches Q9 and Q10 are turned on, and the path unit 1302 is turned on, forming a charging path between the first DC / DC converter 1102 and the energy storage element, and realizing storing the excess electric energy other than that provided for users by the photovoltaic module 1702 in the energy storage element. The first controller 160 and the second controller 240, Figure 12 not shown.

[0158] The following describes how the energy storage circuit 100 provides the electric energy generated by the photovoltaic module for users, and the insufficient electric energy is provided for users by controlling the discharge of the energy storage element.

[0159] In this case, the first controller 160 can control the energy storage element to output electric energy to the first output terminal P1+, or to the first output terminal P2+, or to both the first output terminal P1+ and the first output terminal P2+, which can be specifically set according to the actual situation.

[0160] In the embodiment of the present application, an example is schematically described in which the first controller 160 controls the energy storage element to output electrical energy to both the first output terminal P1+ and the first output terminal P2+.

[0161] Figure 13 It is a state schematic diagram of the sixth working mode of the energy storage circuit provided by the embodiment of the present application. As Figure 13 shown, the energy storage circuit 100 operates in the in-channel hybrid mode 2, and the arrow directions in the figure indicate the flow directions of electrical signals.

[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 an output voltage matching 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 an output voltage matching the energy storage element, and sends it to the second DC / DC converter 2102. In addition, the first controller 160 sends high levels to the first switches Q11 and Q12, the first switches Q11 and Q12 are turned on, and the path unit 1301 is turned on, forming a discharge path between the energy storage element and the first output terminal P1+ to realize outputting the electrical energy stored in the energy storage element to the second DC / DC converter 2101; the first controller 160 sends high levels to the first switches Q9 and Q10, the first switches Q9 and Q10 are turned on, and the path unit 1302 is turned on, forming a discharge path between the energy storage element and the first output terminal P2+ to realize outputting the electrical energy stored in the energy storage element to the second DC / DC converter 2102. The insufficient electrical energy provided by the photovoltaic module 1701 and the photovoltaic module 1702 for users is output by the electrical energy stored in the energy storage element to meet the user's electricity demand.

[0163] 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 electrical energy output by the photovoltaic module 1701 and the photovoltaic module 1702, as well as the electrical energy output by the energy storage element, into alternating current for users to use. The first controller 160 and the second controller 240, Figure 13 are not shown.

[0164] Furthermore, the operation mode of the first controller 160 can be any one of: manual operation mode, automatic operation mode.

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

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

[0167] When the first controller 160 is in the automatic operation mode, the user can trigger the operation mode of the energy storage circuit 100 to be any one of the following modes by initializing the configuration through system power-on or by triggering the third mode switch: battery charging priority mode or battery discharging priority mode.

[0168] When the energy storage circuit 100 is in the battery charging priority mode, the energy storage system can determine whether the user has an electricity demand. When there is an electricity demand, the energy storage circuit 100 operates in Figure 12 the intra-channel hybrid mode 1 as shown. When the user has no electricity demand, the energy storage circuit 100 operates in the charging mode; when the energy storage circuit 100 is in the battery discharging priority mode, the energy storage system determines whether the power output by the photovoltaic module is greater than or equal to the user demand. If the power output by the photovoltaic module is greater than or equal to the user demand, the energy storage circuit 100 operates in the direct connection mode. If the power output by the photovoltaic module is less than the user demand, the energy storage circuit 100 operates in Figure 13 the intra-channel hybrid mode 2 as shown. Further, the energy storage circuit 100 detects the electric energy of the energy storage element. When the electric energy of the energy storage element is low, the energy storage circuit 100 enters the charging mode or Figure 12 the intra-channel hybrid mode 1 as shown, and timely replenishes the electric energy of the energy storage element to prevent over-discharge of the energy storage element and extend the service life of the energy storage element.

[0169] In one example, the energy storage circuit 100 can perform data interaction with the second controller 240 through 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 power output by the photovoltaic module is greater than or equal to the user demand. Further, when the electric energy of the energy storage element is low, the first controller 160 can control the inverter 200 to stop outputting electric energy so that the energy storage circuit 100 enters the charging mode, or reduce the output power of the inverter 200 so that the energy storage circuit 100 enters the intra-channel hybrid mode 1, enabling the electric energy output by the photovoltaic module to flow into the energy storage element and timely replenishing the electric energy of the energy storage element.

[0170] The first mode switch, the second mode switch, and the third mode switch can all be any switch that can input a high-level or low-level signal to the first controller 160. For example, they can be any one of the following: physical switch, 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 the embodiments of the present application do not limit this.

[0171] An embodiment of the present application further provides an electronic device, which includes an energy storage element and an energy storage system.

[0172] Those skilled in the art will readily conceive of other implementations of the present application after considering the specification and practicing the utility model disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only illustrative, and the true scope and spirit of the present application are pointed out by the following claims.

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

Claims

1. A tank circuit (100), characterized in that: include: N energy 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; The energy generation module (170) is electrically connected to the energy storage element via a corresponding first DC / DC converter (110) and a 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 used to control the energy generation 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 outputs electric energy through the corresponding path unit (130); and, when the path unit (130) is turned off, the energy generation module (170) outputs electric energy through the corresponding first DC / DC converter (110).

2. The energy storage circuit (100) according to claim 1, characterized in that: The path unit (130) comprises: 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) comprises: 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 a second output terminal (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) comprises: 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 end of the first DC / DC converter (110); One end of the third switch (114) is electrically connected to the positive output end 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 end of the first DC / DC converter (110), and the other end of the first capacitor (116) is electrically connected to the negative input end of the first DC / DC converter (110); One end of the second capacitor (117) is electrically connected to the positive output end of the first DC / DC converter (110), and the other end of the second capacitor (117) is electrically connected to the negative output end 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 end 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 end 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 a charging mode, the channels where the path unit (130) is located are all in the charging mode; when the channels where the path unit (130) is located are in the 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 a discharge mode, the channels where the path unit (130) is located are all in the discharge mode; when the channels where the path unit (130) is located are in the 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 a pass-through mode, the channels where the path unit (130) is located are all in the pass-through mode; when the channels where the path unit (130) is located are in the pass-through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously turned on, 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 in-channel mixing mode, the channels where the path units (130) are located are all in the in-channel mixing mode; when the channels where the path units (130) are located are in the in-channel mixing mode, the path units (130) are 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 an inter-channel mixed mode, there are at least two channels whose current modes are different; wherein the modes of the channels include a charging mode, an intra-channel mixed mode, a discharging mode, and a direct-through mode; When the channel where the path unit (130) is located is in the 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); When the channel where the path unit (130) is located is in the 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 a through mode, the path unit (130) is continuously disconnected, the second switch (113) and the third switch (114) are continuously turned on, and the fourth switch (118) and the fifth switch (119) are continuously turned off.

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

12. An energy storage system, characterized in that: The energy storage system comprises: an energy storage circuit (100) and an inverter (200) according to any one of claims 1 to 11; The energy storage circuit (100) is electrically connected to the inverter (200); The output end of the inverter (200) is used to connect a load, and the inverter (200) is used to invert the direct current output by the energy storage circuit (100) into alternating current.

13. The energy storage system according to claim 12, characterized in that: The inverter (200) comprises: N second DC / DC converters (210), a DC / AC converter (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); and 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) comprises: a second sampling unit (242), the second sampling unit (242) being electrically connected to at least one of the second DC / DC converter (210) and the DC / AC converter (230); the second sampling unit (242) being used for sampling to obtain a second electrical parameter; the second electrical parameter comprising at least one of: voltage, current, temperature, and smoke; A second control unit (244), the second control unit (244) being electrically connected to the second sampling unit (242); the second control unit (244) being used for executing a control strategy according to the second electrical parameter to output a second control signal; A second driving unit (241), the second driving unit (241) being electrically connected to the second control unit (244), the second DC / DC converter (210), and the DC / AC converter (230); the second driving unit (241) being used for performing level conversion on the second control signal output by the second control unit (244) and driving the second DC / DC converter (210) and / or the DC / AC converter (230) to operate.

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 via the first communication unit (164) and the second communication unit (243), so that the first controller (160) performs power control and / or status monitoring on the inverter (200).

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

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