Energy storage inverter circuit, energy storage inverter method, energy storage system and electronic equipment

Abstract

The invention relates to an energy storage inverter circuit, an energy storage inverter method, an energy storage system and electronic equipment, the energy storage inverter circuit comprises a voltage conversion module, a pre-charging module and a detection control module, the polarity of a first battery end access signal is detected through the detection control module, and a positive electric signal is accessed to the first battery end; under the condition that the pre-charging module finishes pre-charging, the connection between the first battery end and the voltage conversion module is conducted, so that the pre-charging module is short-circuited, and the energy storage battery provides a charging signal to the voltage conversion module, and therefore, reliable battery reverse connection protection can be realized by utilizing a simple polarity detection function; the damage to the energy storage inverter circuit and the battery is avoided, the charging safety and reliability are improved, the loss is low, the battery can be used for a lead-acid battery and a lithium battery, and the adaptability is wide; reverse connection protection of the battery is achieved, meanwhile, the pre-charging module can be short-circuited after pre-charging is completed, and the heating problem is solved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic energy storage technology, and in particular to an energy storage inverter circuit, an energy storage inverter method, an energy storage system and an electronic device. Background Art

[0002] With the development of energy storage technology, energy storage systems are increasingly being used in users' daily lives. For example, more users are choosing home energy storage systems, which can be used to power homes through the combination of distributed photovoltaic modules and energy storage batteries. Using energy storage inverter circuits (Power Conversion System, PCS), energy storage systems can power homes with new energy power generation equipment such as solar panels, and can also manage power at the same time, storing excess power in batteries, and then supplying it to the grid through voltage conversion and other methods. Energy storage systems can not only serve as emergency power supplies, but also save electricity expenses for families, and can be used for general household appliances, computers, lighting, communication equipment, etc.

[0003] However, during the construction process, the energy storage system is prone to the problem of reverse battery connection. When the battery is reversely connected, a huge instantaneous current will be generated, which will cause damage to the energy storage inverter circuit and the battery itself, and may also endanger the user's personal safety. Summary of the invention

[0004] The embodiments of the present application provide an energy storage inverter circuit, an energy storage inverter method, an energy storage system and an electronic device, which can avoid damage to the energy storage inverter current and the energy storage battery itself caused by the huge instantaneous current when the battery is reversely connected, thereby improving the safety of electricity use.

[0005] An energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal, wherein any one of the first battery terminal and the second battery terminal is used to be connected to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to be connected to the negative electrode of the energy storage battery, and the output terminal is used to be connected to a load, and the energy storage inverter circuit includes:

[0006] A voltage conversion module, connected to the output end, for converting the received signal and outputting it to the load;

[0007] A pre-charging module, connected between the first battery terminal and the voltage conversion module, and used for pre-charging the voltage conversion module;

[0008] The detection control module is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module and the two ends of the pre-charging module, and is used to detect the polarity of the signal connected to the first battery terminal. When the first battery terminal is connected to a positive signal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

[0009] In one embodiment, the detection control module includes:

[0010] a first detection unit, connected to the first battery terminal and the second battery terminal respectively, and configured to output a detection signal based on a first signal connected to the first battery terminal and a second signal connected to the second battery terminal;

[0011] A first switch unit is connected to two ends of the pre-charging module, the first battery end, and the voltage conversion module respectively;

[0012] A control unit is respectively connected to the first detection unit and the first switch unit, and is used to determine the polarity of the first signal based on the detection signal, and when the first signal is a positive signal and the pre-charging of the pre-charging module is completed, control the first switch unit to conduct the connection between the first battery terminal and the voltage conversion module.

[0013] In one embodiment, the first detection unit is further used to detect a first voltage of the first signal; and the detection control module further includes:

[0014] A second detection unit is connected to the pre-charging module, the voltage conversion module, the second battery terminal, and the control unit respectively, and is used to detect a second voltage output by the pre-charging module;

[0015] The control unit is further configured to determine that pre-charging of the pre-charging module is completed when the difference between the first voltage and the second voltage is within a preset range.

[0016] In one embodiment, the first detection unit comprises:

[0017] a differential amplification subunit, connected to the first battery terminal, the second battery terminal and the control unit respectively, and configured to perform differential amplification processing on the first signal and the second signal to output a differential signal;

[0018] The filtering subunit is connected to the differential amplifying subunit and the control unit respectively, and is used to filter the differential signal and then output the detection signal.

[0019] In one embodiment, the energy storage inverter circuit further includes:

[0020] a polarity switching module, connected to the pre-charging module, the first detection end of the detection control module, the second detection end of the detection control module, the first battery end and the second battery end, respectively, for conducting and connecting one of the first battery end and the second battery end to the pre-charging module and the first detection end, and conducting and connecting the other of the first battery end and the second battery end to the second detection end;

[0021] Among them, when the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the detection control module controls the polarity switching module to switch the connection state to connect one end to the second detection end and connect the other end to the first detection end.

[0022] In one embodiment, the polarity switching module includes:

[0023] a second switch unit, wherein a first end of the second switch unit is connected to the pre-charging module and the first detection end respectively, and two second ends of the second switch unit are connected to the first battery end and the second battery end respectively, and the second switch unit is used to switchably connect the pre-charging module and the first detection end to the one end;

[0024] a third switch unit, wherein a first end of the third switch unit is connected to the second detection end, two second ends of the third switch unit are respectively connected to the first battery end and the second battery end, and the third switch unit is used to switchably connect the second detection end to the other end;

[0025] Wherein, when the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the detection control module controls the second switch unit and the third switch unit to switch the connection state.

[0026] In one embodiment, the energy storage inverter circuit further has a photovoltaic input terminal, and the photovoltaic input terminal is used to be connected to the voltage conversion module and the photovoltaic component respectively; the voltage conversion module is also used to convert and process the photovoltaic signal provided by the photovoltaic component to supply power to the target object, and the target object includes any one of the energy storage battery and the load;

[0027] The detection control module is further configured to conduct the connection between the voltage conversion module and the energy storage battery when the first battery terminal is conductively connected to the positive electrode of the energy storage battery and the target object is the energy storage battery.

[0028] In one of the embodiments, the detection control module is further configured to output an alarm signal when a negative electrical signal is connected to the first battery terminal to indicate that the energy storage battery is reversely connected.

[0029] In one embodiment, the number of the energy storage batteries is multiple, the number of the first battery terminals and the second battery terminals are correspondingly multiple, and each of the energy storage batteries is correspondingly connected to one first battery terminal and one second battery terminal.

[0030] In one embodiment, the pre-charging module comprises:

[0031] A pre-charging unit connected to the voltage conversion module;

[0032] The anti-reverse connection unit is connected to the first battery terminal and the pre-charging unit respectively, and is used to conduct the connection between the pre-charging unit and the first battery terminal when the first battery terminal is connected to a positive electrical signal during the pre-charging process, so that the pre-charging unit is connected to a positive electrical signal and pre-charges the voltage conversion module.

[0033] An energy storage system, comprising:

[0034] Energy storage batteries; and

[0035] An energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal, wherein any one of the first battery terminal and the second battery terminal is used to be connected to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to be connected to the negative electrode of the energy storage battery, and the output terminal is used to be connected to a load, and the energy storage inverter circuit includes:

[0036] A voltage conversion module, connected to the output end, for converting the received signal and outputting it to the load;

[0037] A pre-charging module, connected between the first battery terminal and the voltage conversion module, and used for pre-charging the voltage conversion module;

[0038] The detection control module is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module and the two ends of the pre-charging module, and is used to detect the polarity of the signal connected to the first battery terminal. When the first battery terminal is connected to a positive signal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

[0039] In one embodiment, the energy storage inverter circuit further has a photovoltaic input terminal, and the photovoltaic input terminal is connected to the voltage conversion module. The energy storage system further includes:

[0040] A photovoltaic component is connected to the photovoltaic input terminal and is used to provide a photovoltaic signal to the voltage conversion module, so that the voltage conversion module converts and processes the photovoltaic signal and then supplies power to a target object, wherein the target object includes any one of the energy storage battery and the load.

[0041] A method for controlling energy storage inverter is applied to an energy storage inverter circuit, wherein the energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal, wherein any one of the first battery terminal and the second battery terminal is used to be connected to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to be connected to the negative electrode of the energy storage battery, and the output terminal is used to be connected to a load; the energy storage inverter circuit comprises a voltage conversion module and a pre-charging module, wherein the voltage conversion module is connected to the output terminal and is used to convert and process a received signal and then output it to the load; the pre-charging module is connected between the first battery terminal and the voltage conversion module and is used to pre-charge the voltage conversion module when a positive electrical signal is received; the method for controlling energy storage inverter comprises:

[0042] Detecting the polarity of the signal connected to the first battery terminal;

[0043] When a positive electrical signal is connected to the first battery terminal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

[0044] In one embodiment, the energy storage inverter circuit further includes a polarity switching module, which is respectively connected to the pre-charging module, the first detection end, the second detection end, the first battery end and the second battery end, and is used to connect one of the first battery end and the second battery end to the pre-charging module and the first detection end, and to connect the other of the first battery end and the second battery end to the second detection end; the energy storage inverter control method further includes:

[0045] When the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the polarity switching module is controlled to switch the connection state to connect the one end to the second detection end and connect the other end to the first detection end.

[0046] In one embodiment, the energy storage inverter circuit further has a photovoltaic input terminal, and the photovoltaic input terminal is used to be connected to the voltage conversion module and the photovoltaic component respectively; the voltage conversion module is also used to convert and process the photovoltaic signal provided by the photovoltaic component to supply power to the target object, and the target object includes any one of the energy storage battery and the load; the energy storage inverter control method also includes:

[0047] When the first battery terminal is conductively connected to the positive electrode of the energy storage battery and the target object is the energy storage battery, the connection between the voltage conversion module and the energy storage battery is conductively connected.

[0048] In one embodiment, the energy storage inverter control method further includes:

[0049] When a negative electrical signal is connected to the first battery terminal, an alarm signal is output to indicate that the energy storage battery is reversely connected.

[0050] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the energy storage inverter control method as described in any one of the above items when executing the computer program.

[0051] The energy storage inverter circuit, energy storage inverter method, energy storage system and electronic equipment, the energy storage inverter circuit includes a voltage conversion module, a pre-charging module and a detection control module, the energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal for connecting to a load and a voltage conversion module, the detection control module is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module and the two ends of the pre-charging module, the detection control module detects the polarity of the access signal of the first battery terminal through the detection control module, and when a positive signal is connected to the first battery terminal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on, so that the pre-charging module is short-circuited and the energy storage battery provides the voltage conversion module with a positive signal. For supplying charging signals, on the one hand, a simple polarity detection function can be used to achieve reliable battery reverse connection protection, to prevent the voltage conversion module from receiving a negative electric signal and forming a circulation current inside the voltage conversion module, thereby avoiding damage to the energy storage inverter circuit and the battery itself, improving charging safety and reliability, and having low loss, it can be used for both lead-acid batteries and lithium batteries, with wide adaptability; on the other hand, while achieving battery reverse connection protection, the pre-charging module can also safely and reliably charge the voltage conversion module during the pre-charging process, and be short-circuited after the pre-charging is completed, so that after the energy storage battery is normally powered on to the voltage conversion module, the pre-charging module will not continue to generate a voltage drop and consume electrical energy, thereby improving the heating problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 One of the structural block diagrams of an energy storage system according to an embodiment;

[0054] Figure 2 One of the structural block diagrams of an energy storage inverter circuit according to an embodiment;

[0055] Figure 3a A schematic diagram of a pre-charging module pre-charging a voltage conversion module according to an embodiment;

[0056] Figure 3b A schematic diagram of a circulating current formed inside a voltage conversion module when a battery is reversely connected according to an embodiment;

[0057] Figure 4 This is a second structural block diagram of an energy storage inverter circuit according to an embodiment;

[0058] Figure 5 The third structural block diagram of the energy storage inverter circuit of an embodiment;

[0059] Figure 6 is one of the structural block diagrams of a first detection unit of an embodiment;

[0060] Figure 7 This is a second structural block diagram of a first detection unit according to an embodiment;

[0061] Figure 8 This is a fourth structural block diagram of an energy storage inverter circuit according to an embodiment;

[0062] Fig. 9 This is a fifth structural block diagram of an energy storage inverter circuit according to an embodiment;

[0063] Fig.10 This is a sixth structural block diagram of an energy storage inverter circuit according to an embodiment;

[0064] Fig.11 This is a seventh structural block diagram of an energy storage inverter circuit according to an embodiment;

[0065] Fig.12 This is an eighth structural block diagram of an energy storage inverter circuit according to an embodiment;

[0066] Fig.13 This is a ninth structural block diagram of an energy storage inverter circuit according to an embodiment;

[0067] Fig.14 One of the flow charts of the energy storage inversion method according to one embodiment;

[0068] Fig.15 This is a second flow chart of an energy storage inversion method according to an embodiment;

[0069] Fig.16 This is a third flow chart of an energy storage inversion method according to an embodiment;

[0070] Fig.17 The figure is a structural block diagram of an energy storage inverter device according to an embodiment. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0072] It is understood that the terms "first", "second", etc. used in this application can be used to describe various elements in this article, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time.

[0073] The energy storage inverter circuit and energy storage inverter method involved in the present application can be applied to an energy storage system with photoelectric conversion and energy storage functions. Figure 1 is a structural block diagram of an energy storage system in an embodiment, such as Figure 1 As shown, the energy storage system may include an energy storage inverter circuit 10 , an energy storage battery 20 , and may also include a photovoltaic component 30 .

[0074] The photovoltaic module 30 can convert the absorbed solar energy into direct current electricity, and the energy storage battery 20 can be a storage battery that can support charging and discharging functions. The energy storage inverter circuit 10 can support the photovoltaic storage hybrid inverter function, and can convert the electric energy output by the photovoltaic module 30 and then supply power to the load. The load can be the energy storage battery 20, or it can be a power grid or other electrical equipment. When the load is the power grid, the energy storage inverter circuit 10 can supply power to other electrical equipment through the power grid; it can also convert the electric energy output by the energy storage battery 20 and then supply power to the load.

[0075] The energy storage inverter circuit 10, energy storage inverter method, energy storage system and electronic equipment of this embodiment can also detect the connection status of the energy storage battery 20 to ensure that the photovoltaic hybrid inverter function is performed when the energy storage battery 20 is positively connected, thereby avoiding damage to the energy storage inverter circuit 10 and the battery itself due to reverse connection of the battery.

[0076] Figure 2 FIG. 1 is a structural block diagram of an energy storage inverter circuit 10 in an embodiment. Figure 2 As shown, the energy storage inverter circuit 10 has a first battery terminal, a second battery terminal and an output terminal (the first battery terminal, the second battery terminal and the output terminal are C1, C2, Out in the figure respectively), one of the first battery terminal and the second battery terminal is used to connect to the positive electrode of the energy storage battery 20, the other of the first battery terminal and the second battery terminal is used to connect to the negative electrode of the energy storage battery 20, and the output terminal is used to connect to the load. The energy storage inverter circuit 10 includes: a voltage conversion module 110, a pre-charging module 120 and a detection control module 130.

[0077] The voltage conversion module 110 is connected to the output end, and is used to convert and process the received signal and then output it to the load; the pre-charging module 120 is connected between the first battery end and the voltage conversion module 110, and is used to pre-charge the voltage conversion module 110; the detection control module 130 is respectively connected to the first battery end, the second battery end, the voltage conversion module 110 and the two ends of the pre-charging module 120, and is used to detect the polarity of the signal connected to the first battery end. When a positive signal is connected to the first battery end and the pre-charging of the pre-charging module 120 is completed, the connection between the first battery end and the voltage conversion module 110 is turned on, so that the pre-charging module 120 is short-circuited and the energy storage battery 20 provides a charging signal to the voltage conversion module 110.

[0078] Among them, any one of the first battery terminal and the second battery terminal is used to connect to the positive electrode of the energy storage battery 20, and the other one of the first battery terminal and the second battery terminal is used to connect to the negative electrode of the energy storage battery 20, so that the energy storage inverter circuit 10 can achieve connection with the energy storage battery 20 through the two battery terminals. Optionally, the first battery terminal can be used to connect to the positive electrode of the energy storage battery 20 by default, and the second battery terminal can be used to connect to the negative electrode of the energy storage battery 20 by default. At this time, when the positive and negative electrodes of the energy storage battery 20 are connected to the first battery terminal and the second battery terminal correspondingly, it can be understood that the energy storage battery 20 is in a positive connection state, and the first battery terminal is connected to a positive electrical signal; when the positive electrode of the energy storage battery 20 is connected to the second battery terminal and the negative electrode is connected to the first battery terminal, it can be understood that the energy storage battery 20 is in a reverse connection state, and the first battery terminal is connected to a negative electrical signal. It can be understood that the above is only an example and is not limited. The output end of the energy storage inverter circuit 10 is used to connect to the load. When the load is a power grid, the output end connected to the power grid can be understood as the AC side of the energy storage inverter circuit 10, which is used to output AC signals to the power grid. It can be understood that each end can be a physical port or a virtual port.

[0079] Among them, the detection control module 130 is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module 110 and the two ends of the pre-charging module 120, and can determine the connection status between the energy storage battery 20 and the first battery terminal and the second battery terminal respectively by detecting the polarity of the signal connected to the first battery terminal. It can be understood that when it is detected that the first battery terminal is connected to a positive electrical signal, it can be determined that the energy storage battery 20 is currently in a positive connection state, and when it is detected that the second battery terminal is connected to a negative electrical signal, it can be determined that the energy storage battery 20 is currently in a reverse connection state. The detection control module 130 can control the connection state between each battery terminal and the voltage conversion module 110 based on the aforementioned polarity detection result and the pre-charging result of the pre-charging module 120. For example, the detection control module 130 of this embodiment will only conduct the connection between the first battery terminal and the voltage conversion module 110 when it is detected that the first battery terminal is connected to a positive electrical signal and the pre-charging of the pre-charging module 120 is completed. On the one hand, it can avoid damage to the energy storage inverter circuit 10 and the battery itself when the energy storage battery 20 is reversely connected, thereby improving the charging safety and reliability; on the other hand, the pre-charging module 120 can be short-circuited after the pre-charging is completed, so that after the energy storage battery 20 is normally powered on to the voltage conversion module 110, the pre-charging module 120 will not continue to generate a voltage drop and consume electrical energy, thereby improving the heating problem.

[0080] The voltage conversion module 110 is used to connect to the detection control module 130, the pre-charging module 120, and the load respectively. It can be connected to the energy storage battery 20 through the pre-charging module 120, or it can be connected to the energy storage battery 20 through the detection control module 130. The voltage conversion module 110 can perform voltage conversion processing on the received signal to output a power supply signal suitable for the load. The voltage conversion processing may include one or more voltage conversion units such as direct current / direct current (DC / DC), direct current / alternating current (DC / AC). Optionally, each voltage conversion unit can be a BUCK / BOOST topology circuit. Further optionally, as Figure 3a and Figure 3b As shown, the DC / DC inside the BUCK / BOOST topology circuit may include voltage regulation conversion devices such as a body diode and a filter inductor.

[0081] The pre-charging module 120 is connected between the energy storage battery 20 and the voltage conversion module 110, and the pre-charging module 120 can pre-charge the voltage conversion module 110. Figure 3a Pre-charging can be understood as the pre-charging module 120 slowly charging the capacitor C1 in the voltage conversion module 110 with a small current, and the voltage of the capacitor C1 gradually increases. The charging process is gradual until the voltage of the capacitor C1 reaches a certain set voltage threshold, and the pre-charging is completed. As a result, the power-on time of the voltage conversion module 110 is extended, and the current will not reach the maximum value instantly, which can avoid impacting the voltage conversion module 110.

[0082] Optionally, the pre-charging module 120 may have both a pre-charging function and an anti-reverse connection function, so that pre-charging is only started when the energy storage battery 20 is in a positive connection state. For relevant optional examples, please refer to the introduction below, which will not be repeated here; optionally, in the case where a relevant module with an anti-reverse connection function is set between the energy storage battery 20 and the pre-charging module 120, the pre-charging module 120 may also only have a pre-charging function, so as to perform pre-charging when receiving a positive electrical signal output by the energy storage battery 20. For example, please refer to the relevant optional examples of the polarity switching module 140 below, which will not be repeated here.

[0083] In related art, please refer to Figure 3bWhen the energy storage battery 20 is reversely connected and the BUCK / BOOST topology circuit receives a negative electrical signal, the negative electrical signal will form a loop current through the Q2 body diode and the filter inductor L1 inside the BUCK / BOOST topology circuit. The loop current will damage the PCS and the battery itself, and may also endanger the personal safety of the operator. In order to achieve reverse connection protection of the battery, especially the reverse connection protection of the battery of a household energy storage system, some optional examples in the related art are either to directly use the diode reverse connection circuit with the single-phase conductivity of the diode, or to use an anti-fool design to avoid wiring errors. However, the aforementioned method one has a large loss and is not suitable for high current scenarios, while method two requires strict matching of the battery and the energy storage inverter circuit 10, and has poor adaptability.

[0084] In the energy storage inverter circuit 10 provided in this embodiment, the detection control module 130 is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module 110 and the two ends of the pre-charging module 120. The detection control module 130 detects the polarity of the signal connected to the first battery terminal, and when the positive signal is connected to the first battery terminal and the pre-charging of the pre-charging module 120 is completed, the connection between the first battery terminal and the voltage conversion module 110 is turned on, so that the pre-charging module 120 is short-circuited and the energy storage battery 20 provides a charging signal to the voltage conversion module 110. On the one hand, a simple polarity detection function can be used to achieve reliable battery reverse connection protection, avoiding The voltage conversion module 110 is not connected to a negative electric signal to form a circulation current inside the voltage conversion module 110, thereby avoiding damage to the energy storage inverter circuit 10 and the battery itself, improving charging safety and reliability, and having low loss. It can be used for both lead-acid batteries and lithium batteries, and has wide adaptability. On the other hand, while realizing battery reverse connection protection, the pre-charging module 120 can also charge the voltage conversion module 110 safely and reliably during the pre-charging process, and be short-circuited after the pre-charging is completed. Therefore, after the energy storage battery 20 is normally powered on to the voltage conversion module 110, the pre-charging module 120 will not continue to generate a voltage drop and consume electrical energy, thereby improving the heating problem.

[0085] In one embodiment, if Figure 4 As shown, the detection control module 130 includes: a first detection unit 131 , a first switch unit 132 and a control unit 133 .

[0086] The first detection unit 131 is respectively connected to the first battery terminal and the second battery terminal, and is used to output a detection signal based on the first signal connected to the first battery terminal and the second signal connected to the second battery terminal; the first switch unit 132 is respectively connected to the two ends of the pre-charging module 120, the first battery terminal, and the voltage conversion module 110; the control unit 133 is respectively connected to the first detection unit 131 and the first switch unit 132, and is used to determine the polarity of the first signal based on the detection signal, and when the first signal is a positive electrical signal and the pre-charging of the pre-charging module 120 is completed, control the first switch unit 132 to conduct the connection between the first battery terminal and the voltage conversion module 110.

[0087] Among them, the first detection unit 131 is connected to each battery terminal respectively, and can receive the electrical signal from the energy storage battery 20 through each battery terminal. The first detection unit 131 can output the detection signal based on the first signal connected to the first battery terminal and the second signal connected to the second battery terminal. It can be understood that the polarity of the first signal and the second signal are opposite. When the first battery terminal is connected to the first signal of different polarities and the second battery terminal is connected to the second signal of different polarities, the parameter information of the detection signal output by the first detection unit 131 is different, for example, the voltage amplitude of the detection signal output by the first detection unit 131 is different. Optionally, the corresponding relationship between the detection signal and the polarity of the first signal and the second signal can be pre-set, and the detection logic inside the first detection unit 131 can be pre-set based on the corresponding relationship. Based on the detection logic, the first detection unit 131 can output the corresponding detection signal when receiving the first signal and the second signal.

[0088] The control unit 133 is connected to the first detection unit 131 and the first switch unit 132 respectively. When receiving the detection signal output by the first detection unit 131, the control unit 133 can determine the polarity of the first signal and the second signal based on different parameter information of the detection signal, and control the switching state of the first switch unit 132 based on the polarity detection result. For example, when the first signal is a positive electrical signal and the pre-charging module 120 is pre-charged, the control unit 133 of this embodiment controls the first switch unit 132 to turn on the connection between the first battery terminal and the voltage conversion module 110, so that the pre-charging module 120 is short-circuited, and at the same time, the voltage conversion module 110 receives the positive electrical signal and performs voltage conversion processing.

[0089] In one embodiment, the initial switch state of the first switch unit 132 defaults to the off state, which means that the first switch unit 132 disconnects the connection between the first battery terminal and the voltage conversion module 110, and the pre-charging module 120 is not short-circuited in this state.

[0090] The initial switch state of the first switch unit 132 is the off state by default, which can ensure that before the control unit 133 determines the polarity detection result based on the detection signal, the first battery terminal and the voltage conversion module 110 are kept disconnected, so that the voltage conversion module 110 remains disconnected from the energy storage battery 20 when the negative electric signal is connected to the first battery terminal, and can only receive the pre-charging signal provided by the pre-charging module 120 during the pre-charging process. Optionally, the first switch unit 132 may include a first relay coil and a first switch, and the two ends of the first switch correspond to the two ends of the first switch unit 132 respectively. The control unit 133 can control the on-off state of the first switch by controlling the power on or off of the first relay coil; optionally, the first switch unit 132 may also be a single-pole single-throw switch, and the control unit 133 can directly control the on-off state of the single-pole single-throw switch.

[0091] In one embodiment, the first detection unit 131 is further configured to detect a first voltage of the first signal; Figure 5 As shown, the detection control module 130 also includes: a second detection unit 134 .

[0092] The second detection unit 134 is respectively connected to the pre-charging module 120, the voltage conversion module 110, the second battery terminal, and the control unit 133, and is used to detect the second voltage output by the pre-charging module 120; wherein the control unit 133 is also used to determine that the pre-charging of the pre-charging module 120 is completed when the difference between the first voltage and the second voltage is within a preset range.

[0093] Among them, the preset range in this embodiment can be understood as a smaller difference between the first voltage and the second voltage, for example, it can be considered to be close to zero or equal to zero, so that after a certain period of pre-charging, the input end of the voltage conversion module 110 reaches the preset voltage, indicating that the pre-charging is completed.

[0094] The first detection unit 131 and the second detection unit 134 are respectively connected to the two ends of the pre-charging module 120. On the one hand, the first detection unit 131 can assist the control unit 133 in detecting the polarity of the access signal of each battery terminal as described in the above embodiment; on the other hand, the first detection unit 131 and the second detection unit 134 can work together to respectively obtain the first voltage and the second voltage at both ends of the pre-charging module 120, so that the auxiliary control unit 133 determines the voltage difference between the two ends of the pre-charging module 120 based on the first voltage and the second voltage, and determines the completion status of the pre-charging based on the voltage difference, thereby controlling the on-off state of the first switch unit 132.

[0095] In one embodiment, if Figure 6 As shown, the first detection unit 131 includes: a differential amplifier unit 1311 and a filter unit 1312 .

[0096] The differential amplifier unit 1311 is connected to the first battery terminal, the second battery terminal and the control unit 133 respectively, and is used to perform differential amplification processing on the first signal and the second signal to output a differential signal; the filter unit 1312 is connected to the differential amplifier unit 1311 and the control unit 133 respectively, and is used to output a detection signal after filtering the differential signal.

[0097] The differential amplifier unit 1311 can receive both positive and negative electrical signals, and can perform differential amplification processing on the first and second signals connected, and output different differential signals with high gain based on the input signals of different polarities, eliminating common-mode interference, so as to facilitate the detection of the back-end control unit 133; the filter unit 1312 can filter the differential signal output by the differential amplifier unit 1311 to output a detection signal that is convenient for the control unit 133 to detect and judge, which is beneficial to improve the detection efficiency of the control unit 133 on the basis of improving the detection accuracy of the control unit 133. For example, the filter unit can raise the voltage value of the differential signal through filtering processing, so that the differential signals of different polarities are respectively raised to positive numbers with the same amplitude, which is convenient for the detection of the control unit 133.

[0098] In one embodiment, if Figure 7 As shown, the differential amplifier subunit 1311 and the filter subunit 1312 may include: Figure 7 The device shown can not only support the detection of positive voltage, but also support the detection of negative voltage when the battery is reversely connected. The relationship between the output Vo of the circuit and the input voltage Vpn is: Vo = 3V_REF / 2 + (Rf / R1) * Vpn, where (Rf / R1) * Vpn is the output voltage value of the differential amplifier subunit 1311, and Vo is the output voltage after the output voltage value of the differential amplifier subunit 1311 is raised by the filter subunit 1312. Assuming that the voltage range accepted by the controller is 0-3V, 3V_REF can be 3V, and the same applies to the others; if the voltage range to be detected by the first detection unit is -Vmax ~ +Vmax is -500V ~ +500V, then the value of Rf / R1 can be: (3-1.5) / 500 = 0.003. As an optional example, Rf and Rf` in this embodiment can be 30k, and R1 and R1` can be 10M.

[0099] It should be noted that the second detection unit 134 in the above embodiment may adopt other voltage detection circuits, or may adopt the same circuit components as the first detection unit 131, thereby reducing the types of circuits.

[0100] In one embodiment, if Figure 8As shown, the energy storage inverter circuit 10 further includes: a polarity switching module 140 .

[0101] The polarity switching module 140 is respectively connected to the pre-charging module 120, the first detection end of the detection control module 130, the second detection end of the detection control module 130, the first battery end and the second battery end, and is used to connect one end of the first battery end and the second battery end to the pre-charging module 120 and the first detection end, and to connect the other end of the first battery end and the second battery end to the second detection end.

[0102] Wherein, when the first detection terminal is connected to a negative electrical signal and the second detection terminal is connected to a positive electrical signal, the detection control module 130 controls the polarity switching module to switch the connection state to connect the aforementioned one end to the second detection terminal and connect the aforementioned other end to the first detection terminal. When the first detection terminal is connected to a negative electrical signal and the second detection terminal is connected to a positive electrical signal, the aforementioned one end is a negative polarity end and the aforementioned other end is a positive polarity end, and the energy storage battery is in a reverse connection state. By controlling the polarity switching module 140 to switch the connection state through the detection control module 130, the energy storage battery can be in a positive connection state.

[0103] It can be understood that when the first detection end is connected to a positive electrical signal and the second detection end is connected to a negative electrical signal, the aforementioned one end is the positive polarity end and the aforementioned other end is the negative polarity end. The energy storage battery is just in the positive connection state, and the polarity switching module 140 can remain inactive.

[0104] Thus, the detection control module 130 can switch the connection state of the polarity switching module 140 based on the polarity detection results of the access signals of the first detection end and the second detection end, so as to realize automatic adjustment of the battery polarity, so as to timely adjust the connection state between the energy storage inverter circuit 10 and the energy storage battery 20 when the energy storage battery 20 is in a reverse connection state, so that the pre-charging process and the charging process are charged normally.

[0105] In one embodiment, if Fig. 9 As shown, the polarity switching module 140 includes: a second switch unit 141 and a third switch unit 142 .

[0106] A second switch unit 141, wherein the first end of the second switch unit 141 is respectively connected to the pre-charging module 120 and the first detection end, the two second ends of the second switch unit 141 are respectively connected to the first battery end and the second battery end correspondingly, and the second switch unit 141 is used to switchably connect the pre-charging module 120 and the first detection end to one of the first battery end and the second battery end; a third switch unit 142, wherein the first end of the third switch unit 142 is connected to the second detection end, the two second ends of the third switch unit 142 are respectively connected to the first battery end and the second battery end correspondingly, and the third switch unit 142 is used to switchably connect the second detection end to the other of the first battery end and the second battery end.

[0107] Among them, the second switch unit 141 and the third switch unit 142 respectively support the function of switchably connecting their respective first ends to different second ends, so that the second switch unit 141 can be used to switchably connect the pre-charging module 120 and the first detection end to one of the first battery end and the second battery end, so as to finally connect to the positive polarity end of the two battery ends. Similarly, the third switch unit 142 can be used to switchably connect the second detection end to the other of the first battery end and the second battery end, so as to finally connect to the negative polarity end of the two battery ends.

[0108] Among them, when the first detection terminal is connected to a negative electrical signal and the second detection terminal is connected to a positive electrical signal, the detection control module 130 controls the second switch unit 141 and the third switch unit 142 to switch the connection state to connect the aforementioned one end to the second detection terminal and connect the aforementioned other end to the first detection terminal, so that the detection control module 130 can switch the connection state of the second switch unit 141 and the third switch unit 142 based on the polarity detection results of the access signals of the first detection terminal and the second detection terminal to achieve automatic adjustment of the battery polarity. It can be understood that when the first detection terminal is connected to a positive electrical signal and the second detection terminal is connected to a negative electrical signal, at this time, the aforementioned one end is the positive polarity end, the aforementioned other end is the negative polarity end, the energy storage battery is just in the positive connection state, and the second switch unit 141 and the third switch unit 142 can remain inactive.

[0109] Optionally, the first battery terminal can be defaulted to the initial positive polarity terminal, and the second battery terminal can be defaulted to the initial negative polarity terminal. The detection control module 130 controls the on-off state of the second switch unit 141 and the third switch unit 142 based on the polarity detection results of the initial positive polarity terminal and the initial negative polarity terminal access signal, so as to timely adjust the connection state between the energy storage inverter circuit 10 and the energy storage battery 20 when the energy storage battery 20 is in a reverse connection state, so that the pre-charging process and the charging process are charged normally.

[0110] Optionally, the second switch unit 141 may include a second relay coil and a second switch, and the two ends of the second switch correspond to the two ends of the second switch unit 141 respectively. The detection control module 130 can control the on-off state of the second switch by controlling the power on or off of the second relay coil; optionally, the second switch unit 141 may also include a single-pole double-throw switch, and the detection control module 130 can directly control the on-off state of the single-pole double-throw switch.

[0111] Optionally, the third switch unit 142 may include a third relay coil and a third switch, and the two ends of the third switch correspond to the two ends of the third switch unit 142 respectively. The detection control module 130 can control the on-off state of the third switch by controlling the power on or off of the third relay coil; optionally, the third switch unit 142 may also include a single-pole double-throw switch, and the detection control module 130 can directly control the on-off state of the single-pole double-throw switch.

[0112] In one embodiment, if Fig.10 As shown, the energy storage inverter circuit 10 also has a photovoltaic input terminal (such as IN in the figure), which is used to connect to the voltage conversion module 110 and the photovoltaic component 30 respectively; the voltage conversion module 110 is also used to convert and process the photovoltaic signal provided by the photovoltaic component 30 to supply power to the target object, and the target object includes any one of the energy storage battery 20 and the load.

[0113] In addition to converting and processing the signals provided by the energy storage battery 20 and the pre-charging module 120 as in the above-mentioned embodiments, the voltage conversion module 110 of this embodiment can also convert and process the photovoltaic signal provided by the photovoltaic module 30, and then supply power to either the energy storage battery 20 or the load. The voltage conversion module 110 can be understood as a bidirectional voltage conversion module 110, which supports forward voltage conversion from the photovoltaic module 30 to charge the energy storage battery 20, and supports reverse voltage conversion from the energy storage battery 20 to charge the load, thereby realizing the photovoltaic storage inverter conversion function.

[0114] Among them, the detection control module 130 is also used to conduct the connection between the voltage conversion module 110 and the energy storage battery 20 when the first battery terminal is connected to the positive electrode of the energy storage battery 20 and the target object is the energy storage battery 20. When the target object is the energy storage battery 20, the photovoltaic component 30 charges the energy storage battery 20 through the voltage conversion module 110. At this time, if the energy storage battery 20 is in a reverse connection state, it will also affect the charging safety. The detection control module 130 of this embodiment detects the battery connection state before the voltage conversion module 110 charges the energy storage battery 20, which can avoid the damage to the energy storage battery 20 itself and the voltage conversion module 110 caused by the reverse connection state of the energy storage battery 20, thereby improving the charging safety. Optionally, the detection control module 130 can determine the current charge and discharge state of the energy storage system based on the received command signal, and the current charge and discharge state of the energy storage system can include any one of the discharge state of the photovoltaic component 30, the discharge state of the energy storage battery 20, and the charging state of the energy storage battery 20.

[0115] In one embodiment, the detection control module 130 is also used to output an alarm signal when a negative electric signal is connected to the first battery terminal to indicate that the energy storage battery 20 is reversely connected, so that the reverse connection of the energy storage battery 20 can be promptly notified to the user, so that the user can take relevant protective measures. Optionally, in the case where the detection control module 130 includes a display unit and / or a playback unit, the alarm signal can correspond to include an audio / visual alarm signal, a text signal, an audio / video or image signal, etc.; optionally, the energy storage inverter circuit 10 can also include a display module and / or a playback module, and the detection control module 130 can output the alarm signal to the display module and / or the playback module, so that the display module and / or the playback module can correspond to output an audio / visual alarm signal, an audio / video or image signal, etc.

[0116] In one embodiment, the number of energy storage batteries 20 is multiple, and the number of first battery terminals and second battery terminals is correspondingly multiple, and each energy storage battery 20 is correspondingly connected to a first battery terminal and a second battery terminal. Therefore, the energy storage inverter circuit 10 can support connection with multiple energy storage batteries 20. On the one hand, the detection control module 130 can determine the connection state of each energy storage battery 20 through the polarity detection result, and control the on-off state between each energy storage battery 20 and the pre-charging module 120 and the voltage conversion module 110, respectively, to ensure that each energy storage battery 20 can be charged and discharged normally, thereby improving the safety of the charging and discharging process; on the other hand, multiple energy storage batteries 20 can enhance the overall energy storage capacity of the energy storage system to supply power to a larger number of loads, or provide a larger power supply voltage to the loads.

[0117] It can be understood that when there are multiple energy storage batteries 20, if one or more of the batteries are reversely connected, in an optional embodiment in which the energy storage inverter circuit 10 includes a polarity switching module 140, the energy storage inverter circuit 10 can automatically adjust the polarity of the switched battery, and each energy storage battery 20 can be charged and discharged normally; in an optional embodiment in which the energy storage inverter circuit 10 does not include the polarity switching module 140, due to the reverse connection protection function of the detection control module 130, the reversely connected battery will be disconnected from each voltage conversion module 110, and the positively connected battery can be charged and discharged normally.

[0118] In one embodiment, if Fig.11 As shown, the pre-charging module 120 includes: a pre-charging unit 121 and an anti-reverse connection unit 122 .

[0119] The pre-charging unit 121 is connected to the voltage conversion module 110; the anti-reverse connection unit 122 is respectively connected to the first battery terminal and the pre-charging unit 121, and is used to conduct the connection between the pre-charging unit 121 and the first battery terminal when the pre-charging process is in progress and the first battery terminal is connected to a positive electrical signal, so that the pre-charging unit 121 is connected to a positive electrical signal and pre-charges the voltage conversion module 110.

[0120] Among them, the pre-charging unit 121 is used to pre-charge the voltage conversion module 110 based on the positive electrical signal output by the energy storage battery 20 when it is connected to the positive electrode of the energy storage battery 20. Optionally, the pre-charging unit 121 can be, for example, a pre-charging resistor, and the pre-charging function can be achieved by a simple pre-charging resistor.

[0121] Among them, the anti-reverse connection unit 122 is connected between the first battery terminal and the pre-charging unit 121, and can realize reverse connection protection between the energy storage battery 20 and the pre-charging unit 121. Specifically, the anti-reverse connection unit 122 only turns on the connection between the pre-charging unit 121 and the first battery terminal during the pre-charging process and when the first battery terminal is connected to a positive electrical signal, so that the pre-charging unit 121 is connected to a positive electrical signal and provides a pre-charging signal to the voltage conversion module 110.

[0122] It can be understood that in the above-mentioned embodiment with the polarity switching module 140, the pre-charging module 120 can also omit the anti-reverse connection unit 122, and directly ensure that the pre-charging unit 121 is connected to the positive electrode of the energy storage battery 20 through the polarity switching of the polarity switching module 140 to perform normal pre-charging.

[0123] Optionally, the anti-reverse connection unit 122 may include an anti-reverse connection diode, the positive electrode of the anti-reverse connection diode is connected to the first battery terminal, and the negative electrode of the anti-reverse connection diode is connected to the pre-charging unit 121. When the energy storage battery 20 is reversely connected and the first battery terminal is connected to a negative electrical signal, the anti-reverse connection diode is in a cut-off state, which is equivalent to disconnecting the connection between the first battery terminal and the pre-charging unit 121; when the energy storage battery 20 is forwardly connected and the first battery terminal is connected to a positive electrical signal, the anti-reverse connection diode is in a conducting state, which is equivalent to conducting the connection between the first battery terminal and the pre-charging unit 121, so that the anti-reverse connection unit 122 realizes reverse connection protection through the anti-reverse connection diode.

[0124] The above embodiment is explained below with some optional specific examples of an energy storage battery 20:

[0125] Embodiment 1:

[0126] like Fig.12 As shown, the photovoltaic input end of the energy storage inverter circuit 10 is connected to the photovoltaic component 30, the first battery end and the second battery end are respectively connected to the two ends of the energy storage battery 20, and the output end is connected to the power grid. The energy storage inverter circuit 10 includes a voltage conversion module 110, a pre-charging module 120 and a detection control module 130.

[0127] The voltage conversion module 110 includes two DC / DC circuits and one DC / AC circuit as shown in the figure, and the detection control module 130 includes a first detection unit 131, a first switch unit 132 and a control unit 133. Among them, the first detection unit 131 includes a differential amplifier unit 1311 and a filter unit 1312 as shown in the figure; the first switch unit 132 includes a first relay coil (not shown in the figure) and a first switch; the pre-charging module 120 includes a pre-charging unit 121 and an anti-reverse connection unit 122, and the pre-charging unit 121 and the anti-reverse connection unit 122 are pre-charging resistors and anti-reverse connection diodes respectively; the control unit 133 includes a controller.

[0128] When receiving the instruction to discharge the energy storage battery 20, the controller determines the connection status of the battery based on the detection signal of the first detection unit 131. When the energy storage battery 20 is reversely connected, the controller controls the first switch not to be closed and outputs an alarm signal. When the energy storage battery 20 is forwardly connected and the voltages at both battery terminals are within the normal operating range, the controller detects the voltage difference across the pre-charging resistor based on the first detection unit 131 and the second detection unit 134, and controls the first switch to be closed when the voltage difference is small enough, so that the energy storage battery 20 directly charges the voltage conversion module 110.

[0129] In practical applications, when the voltage difference across the pre-charging resistor is less than 10% of the input voltage, it can be considered that the voltage difference is small enough to determine that the pre-charging is completed. At this time, the impact current is relatively small, and the surge impact after the first switch is closed can be prevented. It also prevents damage to the relay under large current and extends the life of the relay.

[0130] Embodiment 2:

[0131] like Fig.13 As shown, the photovoltaic input end of the energy storage inverter circuit 10 is connected to the photovoltaic assembly 30, the first battery end and the second battery end are respectively connected to the two ends of the energy storage battery 20, and the output end is connected to the power grid. The energy storage inverter circuit 10 includes a voltage conversion module 110, a pre-charging module 120, a detection control module 130 and a polarity switching module 140. The relevant descriptions of the voltage conversion module 110, the pre-charging module 120 and the detection control module 130 refer to Example 1. The polarity switching module 140 includes a second switch unit 141 and a third switch unit 142, and the second switch unit 141 and the third switch unit 142 are double-contact relays respectively. The second switch unit 141 includes a second relay coil (not shown in the figure) and a first single-pole double-throw switch, and the third switch unit 142 includes a third relay coil (not shown in the figure) and a second single-pole double-throw switch.

[0132] After receiving the instruction to discharge the energy storage battery 20, the controller determines the connection state of the battery based on the detection signal of the first detection unit 131. In the case that the energy storage battery 20 is reversely connected, the controller controls the two double-contact relays to switch the connection state of the energy storage battery 20 until it is determined that the energy storage battery 20 is forwardly connected. In the case that the voltages at the two battery terminals of the energy storage battery 20 are within the normal operating range, the controller detects the voltage difference between the two terminals of the pre-charging resistor based on the first detection unit 131 and the second detection unit 134, and controls the first switch to close when the voltage difference is small enough, so that the energy storage battery 20 directly charges the voltage conversion module 110.

[0133] Based on the same inventive concept, the embodiment of the present application also provides an energy storage inverter method and device, an energy storage system and an electronic device. The implementation solutions provided by the energy storage inverter method and device, the energy storage system and the electronic device are similar to the implementation solutions recorded in the above energy storage inverter circuit 10, so the specific limitations in the energy storage inverter method and device, the energy storage system and the electronic device embodiments provided below can refer to the above limitations on the energy storage inverter circuit 10, and will not be repeated here.

[0134] Fig.14 FIG. 1 is a flow chart of an energy storage inversion method in an embodiment. The energy storage inversion method in this embodiment is applied to an energy storage inversion circuit. Fig.14 As shown, the energy storage inversion method includes steps 142 to 144.

[0135] Step 142, detecting the polarity of the signal connected to the first battery terminal.

[0136] Step 144, when the first battery terminal is connected to a positive electrical signal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

[0137] Among them, the execution body of steps 142 to 144 may be the detection control module in the above embodiment, and the relevant introduction may refer to the relevant description of the above embodiment.

[0138] The energy storage inverter control method of this embodiment detects the polarity of the signal connected to the first battery terminal, connects a positive electrical signal to the first battery terminal, and when the pre-charging module is pre-charged, conducts the connection between the first battery terminal and the voltage conversion module, so that the pre-charging module is short-circuited and the energy storage battery provides a charging signal to the voltage conversion module. On the one hand, a simple polarity detection function can be used to achieve reliable battery reverse connection protection, avoid the voltage conversion module from connecting a negative electrical signal and forming a circulation inside the voltage conversion module, thereby avoiding damage to the energy storage inverter circuit and the battery itself, improving charging safety and reliability, and having low loss, and can be used for both lead-acid batteries and lithium batteries, with wide adaptability; on the other hand, while achieving battery reverse connection protection, the pre-charging module can also be safely and reliably charged to the voltage conversion module during the pre-charging process, and be short-circuited after the pre-charging is completed, so that after the energy storage battery is normally powered on to the voltage conversion module, the pre-charging module will not continue to generate a voltage drop and consume electrical energy, thereby improving the heating problem.

[0139] In one of the embodiments, the energy storage inverter circuit also has a photovoltaic input terminal, which is used to connect to the voltage conversion module and the photovoltaic component respectively; the voltage conversion module is also used to convert and process the photovoltaic signal provided by the photovoltaic component and then supply power to the target object, which includes any one of the energy storage battery and the load. The energy storage inverter control method also includes: when the first battery terminal is connected to the positive electrode of the energy storage battery and the target object is the energy storage battery, the connection between the voltage conversion module and the energy storage battery is turned on. The execution body of the steps of this embodiment can be the detection control module in the above embodiment, and the relevant introduction can refer to the relevant description of the above embodiment.

[0140] The energy storage inverter control method of this embodiment can realize the photovoltaic storage hybrid inverter function when the energy storage battery is connected in the forward direction, thereby avoiding damage to the energy storage inverter circuit and the battery itself due to reverse connection of the battery.

[0141] In one embodiment, the energy storage inverter control method further includes: outputting an alarm signal when a negative electric signal is connected to the first battery terminal to indicate that the energy storage battery is reversely connected. The execution subject of the steps of this embodiment may be the detection control module in the above embodiment, and the relevant description may refer to the relevant description of the above embodiment. This embodiment can promptly inform the user of the reverse connection of the energy storage battery so that the user can take relevant protective measures.

[0142] In one of the embodiments, the step of detecting the polarity of the signal connected to the first battery terminal, and conducting the connection between the first battery terminal and the voltage conversion module when a positive signal is connected to the first battery terminal and pre-charging of the pre-charging module is completed, includes: determining the polarity of the first signal based on the first signal connected to the first battery terminal and the second signal connected to the second battery terminal, and conducting the connection between the first battery terminal and the voltage conversion module when the first signal is a positive signal and pre-charging of the pre-charging module is completed.

[0143] In one of the embodiments, the step of detecting the polarity of the signal connected to the first battery terminal, connecting the first battery terminal to the voltage conversion module when a positive signal is connected to the first battery terminal and the pre-charging of the pre-charging module is completed, further includes: detecting the first voltage of the first signal connected to the first battery terminal, and detecting the second voltage output by the pre-charging module; and determining that the pre-charging at the pre-charging module is completed when the difference between the first voltage and the second voltage is within a preset range.

[0144] In one embodiment, the energy storage inverter circuit also includes a polarity switching module, which is respectively connected to the pre-charging module, the first detection terminal, the second detection terminal, the first battery terminal and the second battery terminal, and the polarity switching module is used to connect one of the first battery terminal and the second battery terminal to the pre-charging module and the first detection terminal, and to connect the other of the first battery terminal and the second battery terminal to the second detection terminal. The energy storage inverter control method also includes: when the first detection terminal is connected to a negative electrical signal and the second detection terminal is connected to a positive electrical signal, the polarity switching module is controlled to switch the connection state to connect the aforementioned one end to the second detection terminal and the aforementioned other end to the first detection terminal. This embodiment can control the switching state of the polarity switching module based on the polarity detection results of the first detection terminal and the second detection terminal to realize automatic adjustment of the battery polarity, so as to timely adjust the connection state between the energy storage inverter circuit and the energy storage battery when the energy storage battery is reversely connected, so that the pre-charging process and the charging process are charged normally.

[0145] The above embodiments are explained with some optional specific examples as follows:

[0146] Embodiment 3, as Fig.15 As shown, corresponding to Fig.12The energy storage inverter circuit shown in the figure: first detect the connection status of the energy storage battery, and when a negative electric signal is connected to the first battery terminal to determine that the energy storage battery is reversely connected, a battery reverse connection alarm is issued. When a positive electric signal is connected to the first battery terminal to determine that the energy storage battery is positively connected, and when a working instruction to charge the energy storage battery is received and the battery voltage is determined to be within the normal range, it is determined whether the pre-charging is completed. If so, the pre-charging module is short-circuited so that the energy storage battery directly supplies power to the voltage conversion module.

[0147] Embodiment 4, as Fig.16 As shown, corresponding to Fig.13 The energy storage inverter circuit shown: first determine that the polarity switching module is in a normal connection state between the energy storage battery and the first detection terminal and the second detection terminal, then detect the connection state of the energy storage battery, and when the negative electrical signal is connected to the first detection terminal to determine that the energy storage battery is reversely connected, a battery reverse connection alarm is issued, and the polarity switching module is controlled to switch to positive connection. When a working instruction for the energy storage battery to be charged is received and the battery voltage is within the normal range, it is determined whether the pre-charging is completed. If so, the pre-charging module is short-circuited so that the energy storage battery directly supplies power to the voltage conversion module.

[0148] Fig.17 FIG. 1 is a structural block diagram of an energy storage inverter device in an embodiment. The energy storage inverter device in this embodiment is used to execute the corresponding steps of the energy storage inverter method and is applied to an energy storage inverter circuit. Fig.17 As shown, the inverter device includes a detection module 172 and a conduction module 174 .

[0149] The detection module 172 is used to detect the polarity of the first battery terminal access signal.

[0150] The control module 174 is used to connect the first battery terminal to the voltage conversion module when a positive electrical signal is connected to the first battery terminal and the pre-charging of the pre-charging module is completed, so that the pre-charging module is short-circuited and the energy storage battery provides a charging signal to the voltage conversion module.

[0151] The energy storage inverter device of this embodiment detects the polarity of the signal connected to the first battery terminal through the detection module 172. The control module 174 connects the positive electric signal to the first battery terminal and the pre-charging of the pre-charging module is completed. The connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and provide the energy storage battery with a charging signal to the voltage conversion module. On the one hand, a simple polarity detection function can be used to achieve reliable battery reverse connection protection, avoid the voltage conversion module from connecting to a negative electric signal and forming a circulation inside the voltage conversion module, thereby avoiding damage to the energy storage inverter circuit and the battery itself, improving charging safety and reliability, and having low loss, and can be used for both lead-acid batteries and lithium batteries, with wide adaptability; on the other hand, while achieving battery reverse connection protection, the pre-charging module can also be safely and reliably charged to the voltage conversion module during the pre-charging process, and be short-circuited after the pre-charging is completed. Therefore, after the energy storage battery is normally powered on to the voltage conversion module, the pre-charging module will not continue to generate a voltage drop and consume electric energy, thereby improving the heating problem.

[0152] The embodiment of the present application also provides an energy storage system, including: an energy storage battery; and an energy storage inverter circuit as in any of the above embodiments. Based on the energy storage inverter circuit 10, the energy storage system has higher charging safety and reliability, and lower power consumption.

[0153] In one of the embodiments, please refer to Figure 1 The energy storage inverter circuit 10 also has a photovoltaic input terminal, which is connected to the voltage conversion module 110. The energy storage system also includes: a photovoltaic module 30, which is connected to the photovoltaic input terminal and is used to provide a photovoltaic signal to the voltage conversion module 110, so that the voltage conversion module 110 converts and processes the photovoltaic signal and supplies power to the target object, which includes the energy storage battery 20 and any one of the loads. Based on the energy storage inverter circuit 10, the photovoltaic module 30 and the energy storage battery 20, the energy storage system of this embodiment can realize the photovoltaic hybrid inverter function when the energy storage battery 20 is positively connected, avoiding damage to the energy storage inverter circuit 10 and the battery itself due to reverse connection of the battery. It can not only be used as an emergency power supply, but also save electricity expenses for users, and can be used for general household appliances, computers, lighting, communication equipment, etc.

[0154] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the energy storage inverter control method of any of the above embodiments are implemented.

[0155] An embodiment of the present application also provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the communication method of any of the above embodiments are implemented, or the steps of the communication detection method of any of the above embodiments are executed.

[0156] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the energy storage inverter control method in the above embodiment.

[0157] Any reference to memory, storage, database or other medium used in this application may include non-volatile and / or volatile memory. Suitable non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM), which is used as an external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An energy storage inverter circuit, characterized in that: It has a first battery terminal, a second battery terminal and an output terminal, wherein any one of the first battery terminal and the second battery terminal is used to be connected to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to be connected to the negative electrode of the energy storage battery, and the output terminal is used to be connected to a load, and the energy storage inverter circuit includes: A voltage conversion module, connected to the output end, for converting the received signal and outputting it to the load; A pre-charging module, connected between the first battery terminal and the voltage conversion module, and used for pre-charging the voltage conversion module; The detection control module is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module and the two ends of the pre-charging module, and is used to detect the polarity of the signal connected to the first battery terminal. When the first battery terminal is connected to a positive signal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

2. The energy storage inverter circuit according to claim 1, characterized in that: The detection control module comprises: a first detection unit, connected to the first battery terminal and the second battery terminal respectively, and configured to output a detection signal based on a first signal connected to the first battery terminal and a second signal connected to the second battery terminal; A first switch unit is connected to two ends of the pre-charging module, the first battery end, and the voltage conversion module respectively; A control unit is respectively connected to the first detection unit and the first switch unit, and is used to determine the polarity of the first signal based on the detection signal, and when the first signal is a positive signal and the pre-charging of the pre-charging module is completed, control the first switch unit to conduct the connection between the first battery terminal and the voltage conversion module.

3. The energy storage inverter circuit according to claim 2, characterized in that: The first detection unit is further used to detect a first voltage of the first signal; and the detection control module further includes: A second detection unit is connected to the pre-charging module, the voltage conversion module, the second battery terminal, and the control unit respectively, and is used to detect a second voltage output by the pre-charging module; The control unit is further configured to determine that pre-charging of the pre-charging module is completed when the difference between the first voltage and the second voltage is within a preset range.

4. The energy storage inverter circuit according to claim 2, characterized in that: The first detection unit comprises: a differential amplification subunit, connected to the first battery terminal, the second battery terminal and the control unit respectively, and configured to perform differential amplification processing on the first signal and the second signal to output a differential signal; The filtering subunit is connected to the differential amplifying subunit and the control unit respectively, and is used to filter the differential signal and then output the detection signal.

5. The energy storage inverter circuit according to claim 1, characterized in that: The energy storage inverter circuit also includes: a polarity switching module, connected to the pre-charging module, the first detection end of the detection control module, the second detection end of the detection control module, the first battery end and the second battery end, respectively, for conducting and connecting one of the first battery end and the second battery end to the pre-charging module and the first detection end, and conducting and connecting the other of the first battery end and the second battery end to the second detection end; Among them, when the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the detection control module controls the polarity switching module to switch the connection state to connect one end to the second detection end and connect the other end to the first detection end.

6. The energy storage inverter circuit according to claim 5, characterized in that: The polarity switching module comprises: a second switch unit, wherein a first end of the second switch unit is connected to the pre-charging module and the first detection end respectively, and two second ends of the second switch unit are connected to the first battery end and the second battery end respectively, and the second switch unit is used to switchably connect the pre-charging module and the first detection end to the one end; a third switch unit, wherein a first end of the third switch unit is connected to the second detection end, two second ends of the third switch unit are respectively connected to the first battery end and the second battery end, and the third switch unit is used to switchably connect the second detection end to the other end; Wherein, when the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the detection control module controls the second switch unit and the third switch unit to switch the connection state.

7. The energy storage inverter circuit according to claim 1, characterized in that: The energy storage inverter circuit also has a photovoltaic input terminal, which is used to be connected to the voltage conversion module and the photovoltaic component respectively; the voltage conversion module is also used to convert and process the photovoltaic signal provided by the photovoltaic component and supply power to the target object, and the target object includes any one of the energy storage battery and the load; The detection control module is further configured to conduct the connection between the voltage conversion module and the energy storage battery when the first battery terminal is conductively connected to the positive electrode of the energy storage battery and the target object is the energy storage battery.

8. The energy storage inverter circuit according to any one of claims 1 to 7, characterized in that: The detection control module is further configured to output an alarm signal when a negative electrical signal is connected to the first battery terminal to indicate that the energy storage battery is reversely connected.

9. The energy storage inverter circuit according to any one of claims 1 to 7, characterized in that: The number of the energy storage batteries is multiple, the number of the first battery terminals and the second battery terminals are correspondingly multiple, and each of the energy storage batteries is correspondingly connected to one first battery terminal and one second battery terminal.

10. The energy storage inverter circuit according to any one of claims 1 to 7, characterized in that: The pre-charging module comprises: A pre-charging unit connected to the voltage conversion module; The anti-reverse connection unit is connected to the first battery terminal and the pre-charging unit respectively, and is used to conduct the connection between the pre-charging unit and the first battery terminal when the first battery terminal is connected to a positive electrical signal during the pre-charging process, so that the pre-charging unit is connected to a positive electrical signal and pre-charges the voltage conversion module.

11. An energy storage system, characterized in that: include: Energy storage batteries; and An energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal, wherein any one of the first battery terminal and the second battery terminal is used to be connected to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to be connected to the negative electrode of the energy storage battery, and the output terminal is used to be connected to a load, and the energy storage inverter circuit includes: A voltage conversion module, connected to the output end, for converting the received signal and outputting it to the load; A pre-charging module, connected between the first battery terminal and the voltage conversion module, and used for pre-charging the voltage conversion module; The detection control module is respectively connected to the first battery terminal, the second battery terminal, the voltage conversion module and the two ends of the pre-charging module, and is used to detect the polarity of the signal connected to the first battery terminal. When the first battery terminal is connected to a positive signal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

12. The energy storage system according to claim 11, characterized in that: The energy storage inverter circuit also has a photovoltaic input terminal, and the photovoltaic input terminal is connected to the voltage conversion module. The energy storage system also includes: A photovoltaic component is connected to the photovoltaic input terminal and is used to provide a photovoltaic signal to the voltage conversion module, so that the voltage conversion module converts and processes the photovoltaic signal and then supplies power to a target object, wherein the target object includes any one of the energy storage battery and the load.

13. A method for controlling energy storage inverter, characterized in that: Applied to an energy storage inverter circuit, the energy storage inverter circuit has a first battery terminal, a second battery terminal and an output terminal, any one of the first battery terminal and the second battery terminal is used to connect to the positive electrode of the energy storage battery, the other of the first battery terminal and the second battery terminal is used to connect to the negative electrode of the energy storage battery, and the output terminal is used to connect to a load; the energy storage inverter circuit includes a voltage conversion module and a pre-charging module, the voltage conversion module is connected to the output terminal and is used to convert and process the received signal and then output it to the load; the pre-charging module is connected between the first battery terminal and the voltage conversion module, and is used to pre-charge the voltage conversion module when a positive electrical signal is received; The energy storage inverter control method comprises: Detecting the polarity of the signal connected to the first battery terminal; When a positive electrical signal is connected to the first battery terminal and the pre-charging of the pre-charging module is completed, the connection between the first battery terminal and the voltage conversion module is turned on to short-circuit the pre-charging module and the energy storage battery provides a charging signal to the voltage conversion module.

14. The energy storage inverter control method according to claim 13, characterized in that: The energy storage inverter circuit further includes a polarity switching module, which is connected to the pre-charging module, the first detection terminal, the second detection terminal, the first battery terminal and the second battery terminal respectively, and is used to connect one of the first battery terminal and the second battery terminal to the pre-charging module and the first detection terminal, and to connect the other of the first battery terminal and the second battery terminal to the second detection terminal; The energy storage inverter control method also includes: When the first detection end is connected to a negative electrical signal and the second detection end is connected to a positive electrical signal, the polarity switching module is controlled to switch the connection state to connect the one end to the second detection end and connect the other end to the first detection end.

15. The energy storage inverter control method according to claim 13, characterized in that: The energy storage inverter circuit also has a photovoltaic input terminal, which is used to connect to the voltage conversion module and the photovoltaic component respectively; the voltage conversion module is also used to convert the photovoltaic signal provided by the photovoltaic component and supply power to the target object, and the target object includes any one of the energy storage battery and the load; the energy storage inverter control method also includes: When the first battery terminal is conductively connected to the positive electrode of the energy storage battery and the target object is the energy storage battery, the connection between the voltage conversion module and the energy storage battery is conductively connected.

16. The energy storage inverter control method according to any one of claims 13 to 15, characterized in that: The energy storage inverter control method also includes: When a negative electrical signal is connected to the first battery terminal, an alarm signal is output to indicate that the energy storage battery is reversely connected.

17. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the energy storage inverter control method as described in any one of claims 13-16 are implemented.

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