Energy storage system, energy complementing method, electronic device, storage medium and program product

Abstract

The invention relates to an energy storage system, an energy complementing method, electronic equipment, a storage medium and a program product. The energy storage system comprises a system controller and an energy storage string, and the system controller is connected with each energy storage sub-module in the energy storage string; the energy storage sub-modules of the energy storage string are connected in a loop, the energy storage sub-modules in the energy storage string comprise charging energy storage sub-modules, and the charging energy storage sub-modules are provided with energy supplementing power supplies. According to the invention, the energy complementing efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an energy storage system, an energy replenishment method, an electronic device, a storage medium, and a program product. Background Art

[0002] In some power transmission projects, energy storage submodules are assembled into valve towers for operation tests. For example, two valve towers are pushed against each other in direct current to simulate the current and voltage of the valve tower under real working conditions. During the pushing process, the energy storage submodule will lose power.

[0003] At present, the energy replenishment method is usually to manually charge the battery in each energy storage submodule, or to connect multiple energy replenishment devices in the valve tower. However, the number of energy storage submodules is large, and the above method is inefficient. Summary of the invention

[0004] Based on the above problems, the present application provides an energy storage system, an energy replenishment method, an electronic device, a storage medium and a program product, which can improve the energy replenishment efficiency.

[0005] In a first aspect, the present application provides an energy storage system. The energy storage system includes a system controller and an energy storage string, wherein the system controller is connected to each energy storage submodule in the energy storage string; each energy storage submodule in the energy storage string is connected in a loop, and the energy storage submodule in the energy storage string includes a charging energy storage submodule, and the charging energy storage submodule is provided with an energy supplement power supply.

[0006] In the technical solution of the embodiment of the present application, a supplementary power supply is provided in one energy storage submodule of the energy storage string, which can supplement energy for another one or more energy storage submodules, and the supplementary energy efficiency can be greatly improved by automatically controlling the supplementary energy. In addition, since fewer supplementary energy devices are connected, the cost can also be reduced.

[0007] In some embodiments, in at least two interconnected energy storage strings, the energy storage submodule of the first energy storage string includes a charging energy storage submodule, and the energy storage submodule of the second energy storage string includes a target energy storage submodule. In the technical solution of the embodiment of the present application, a replenishment power supply is provided in an energy storage submodule of an energy storage string, so that the energy storage submodule of another energy storage string can be replenished, and the replenishment efficiency can be greatly improved by automatically controlling the replenishment. In addition, since fewer energy replenishment devices are connected, the cost can also be reduced.

[0008] In some embodiments, each energy storage submodule includes a power module, and the power module in the charging energy storage submodule is connected in parallel with the energy replenishment power supply; the system controller is connected to the energy replenishment power supply and each power module respectively. In the technical solution of the embodiment of the present application, the power module of each energy storage submodule and the energy replenishment power supply can be controlled to automatically replenish the energy storage submodules in the energy storage string, which not only has high energy replenishment efficiency, but also has fewer connected energy replenishment devices and relatively low energy replenishment costs.

[0009] In some embodiments, each energy storage submodule includes a battery unit, and the battery unit is connected in parallel with the power module. In the technical solution of the embodiment of the present application, the battery unit is an energy storage component, which can provide electrical energy for the energy storage string to simulate the current and voltage of the real working condition.

[0010] In some embodiments, the first end of the first energy storage string is connected to the first end of the second energy storage string through a reactor, and the second end of the first energy storage string is connected to the second end of the second energy storage string. In the technical solution of the embodiment of the present application, the first energy storage string and the second energy storage string form a path, and the reactor can store energy through the reactor when the power supply voltage of the energy compensation power supply is insufficient, thereby replenishing energy for the energy storage submodule in another energy storage string.

[0011] In some embodiments, the second end of the first energy storage string is grounded, and the second end of the second energy storage string is grounded.

[0012] In a second aspect, the present application provides an energy replenishment method. Applied to the above energy storage system, the method comprises: determining a target energy storage submodule to be charged from the energy storage system; and controlling each energy storage submodule in the energy storage system so that the energy replenishment power source of the charging energy storage submodule of the energy storage system replenishes energy for the target energy storage submodule.

[0013] In the technical solution of the embodiment of the present application, by setting a supplementary power supply in one energy storage submodule of the energy storage string, one or more energy storage submodules can be supplemented, and the automatic control of supplementary energy can greatly improve the supplementary energy efficiency. In addition, since fewer supplementary energy devices are connected, the cost can also be reduced.

[0014] In some embodiments, each energy storage submodule in the energy storage system is controlled so that the energy replenishment power supply of the charging energy storage submodule of the energy storage system replenishes energy for the target energy storage submodule, including: controlling the power module in each energy storage submodule to form a charging path from the charging energy storage submodule to the target energy storage submodule; controlling the energy replenishment power supply to charge the target energy storage submodule. In the technical solution of the embodiment of the present application, automatic energy replenishment can be achieved by controlling the power module of each energy storage submodule, the control method is simple and easy to implement, and the control efficiency is high, so the energy replenishment efficiency can be improved.

[0015] In some embodiments, controlling the power modules in each energy storage submodule includes: controlling the power modules of the energy storage submodules other than the charging energy storage submodule to cut out the energy storage submodules other than the charging energy storage submodule; controlling the power modules of the charging energy storage submodule to connect to the charging energy storage submodule; and controlling the power modules of the target energy storage submodule to connect to the target energy storage submodule according to the module voltage of the target energy storage submodule and the power supply voltage of the energy replenishment power supply. In the technical solution of the embodiment of the present application, by controlling the power modules of each energy storage submodule, only the charging energy storage submodule and the target energy storage submodule can be connected to the energy storage string, so that the charging energy storage submodule charges the target energy storage submodule. Not only is the control method simple, but the energy replenishment efficiency is high, a large number of devices do not need to be connected, and the energy replenishment cost is relatively low.

[0016] In some embodiments, according to the module voltage of the target energy storage submodule and the power supply voltage of the energy replenishment power supply, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule, including: when the power supply voltage is greater than or equal to the module voltage, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule. In the technical solution of the embodiment of the present application, if the power supply voltage is greater than or equal to the module voltage, the target energy storage submodule can be directly connected to the energy storage string, so as to quickly replenish the target energy storage submodule.

[0017] In some embodiments, according to the module voltage of the target energy storage submodule and the power supply voltage of the energy replenishment power supply, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule, including: when the power supply voltage is less than the module voltage, if the current of the reactor of the energy storage system reaches a preset current value, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule. In the technical solution of the embodiment of the present application, the charging voltage applied to the target energy storage submodule is made to meet the charging demand of the target energy storage submodule through the reactor, thereby improving the reliability of energy replenishment and achieving a better energy replenishment effect.

[0018] In some embodiments, controlling a power module of an energy storage submodule other than the charging energy storage submodule to cut out the energy storage submodule other than the charging energy storage submodule includes:

[0019] In the case where the power module is a half-bridge switch circuit, the first switch tube of the energy storage submodule other than the charging energy storage submodule is controlled to be turned off and the second switch tube is turned on;

[0020] When the power module is a full-bridge switching circuit, the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the sixth switch tube are turned off; or, the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule are controlled to be turned off, and the fourth switch tube and the sixth switch tube are turned on.

[0021] In some embodiments, determining a target energy storage submodule to be charged from an energy storage system includes: obtaining the state of charge of each energy storage submodule; and determining the target energy storage submodule according to multiple states of charge. In the technical solution of the embodiment of the present application, determining the target energy storage submodule according to the state of charge is more in line with the actual energy replenishment demand, and thus can improve the energy replenishment efficiency.

[0022] In a third aspect, the present application further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the method of the second aspect when executing the computer program.

[0023] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method of the second aspect is implemented.

[0024] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which implements the method of the second aspect when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the optional embodiments below. The accompanying drawings are only used for the purpose of illustrating the optional embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A schematic diagram of the structure of an energy storage system according to an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the structure of an energy storage system according to an embodiment of the present application;

[0028] Figure 3 is a structural schematic diagram of an energy storage system according to an embodiment of the present application;

[0029] Figure 4 It is a structural schematic diagram of other energy storage submodules in one embodiment of the present application;

[0030] Figure 5 is a schematic structural diagram of a power module according to an embodiment of the present application;

[0031] Figure 6 is a schematic structural diagram of a power module according to an embodiment of the present application;

[0032] Figure 7 is a schematic structural diagram of a power module according to an embodiment of the present application;

[0033] Figure 8 is a schematic structural diagram of a power module according to an embodiment of the present application;

[0034] Figure 9a is a structural schematic diagram of an energy storage submodule according to an embodiment of the present application;

[0035] Figure 9b is a structural schematic diagram of an energy storage submodule according to an embodiment of the present application;

[0036] Fig.10 It is a structural schematic diagram of a charging energy storage submodule according to an embodiment of the present application;

[0037] Fig.11 is a flow chart of an energy replenishment method according to an embodiment of the present application;

[0038] Fig.12 It is a flowchart of the steps of controlling the charging energy storage submodule according to an embodiment of the present application;

[0039] Fig.13 is a flowchart of the steps of controlling a power module according to an embodiment of the present application;

[0040] Fig.14 is a flow chart of the steps of controlling the switch tube according to an embodiment of the present application;

[0041] Fig.15a is a schematic diagram of a charging path of an embodiment of the present application;

[0042] Fig.15b is a schematic diagram of a charging path of an embodiment of the present application;

[0043] Fig.16 is a flow chart of the steps of controlling the switch tube according to an embodiment of the present application;

[0044] Fig.17a is a schematic diagram of a charging path of an embodiment of the present application;

[0045] Fig.17b is a schematic diagram of a charging path of an embodiment of the present application;

[0046] Fig.18 is a flow chart of the steps of determining a target energy storage submodule according to an embodiment of the present application;

[0047] Fig.19 is an internal structure diagram of an electronic device according to an embodiment of the present application;

[0048] Description of reference numerals:

[0049] System controller 11, energy storage string 12, energy storage submodule 121;

[0050] Charging energy storage submodule SMx, target energy storage submodule SMy, energy replenishment power supply U;

[0051] Power module 1211, battery unit 1212;

[0052] A first switch tube S1, a second switch tube S2, a first diode D1, and a second diode D2;

[0053] A first node J1, a second node J2;

[0054] A third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, and a sixth switch tube S6;

[0055] a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6;

[0056] Bypass switch K1, battery switch K2, resistance switch K3, energy replenishment switch K4, capacitor C, resistor R. DETAILED DESCRIPTION

[0057] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0059] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0063] In some power transmission projects, multiple energy storage submodules are assembled into an energy storage string, and the energy storage string is subjected to operation tests.

[0064] Energy storage string refers to two or more energy storage submodules connected to form a string of energy storage devices, which can be in the form of valve towers, containers, etc. Valve towers include energy storage submodules stacked and arranged on a multi-layer frame like a tower, and the frame can be optionally insulated from the ground. The container includes energy storage submodules arranged in parallel in the container. The following implementations all take the valve tower form as an example.

[0065] For example, two valve towers are pushed against each other in direct current to simulate the current and voltage of the valve tower under real working conditions. During the pushing process, the energy storage submodule will lose power. At present, the energy replenishment method is usually to manually charge the battery in each energy storage submodule. However, there are many energy storage submodules, and manually connecting the energy replenishment device to each energy storage submodule results in low efficiency. In addition, the cost is relatively high when more energy replenishment devices are connected.

[0066] The embodiment of the present application provides an energy storage system, which includes a system controller and an energy storage string, wherein the system controller is connected to each energy storage submodule in the energy storage string; each energy storage submodule of the energy storage string is connected in a loop, and the energy storage submodule in the energy storage string includes a charging energy storage submodule, and the charging energy storage submodule is provided with an energy replenishment power supply; the system controller controls each energy storage submodule so that the energy replenishment power supply replenishes energy for the target energy storage submodule in the energy storage string. In the technical solution of the embodiment of the present application, an energy replenishment power supply is provided in an energy storage submodule of an energy storage string, so that energy replenishment can be provided for another energy storage submodule, for multiple other energy storage submodules, or for one or more energy storage submodules of other energy storage strings. Compared with traditional technologies, automatic control of energy replenishment can greatly improve energy replenishment efficiency. Moreover, since fewer energy replenishment devices are connected, costs can also be reduced.

[0067] According to some embodiments of the present application, referring to Figure 1, provides an energy storage system. The energy storage system includes a system controller 11 and an energy storage string 12, the system controller 11 is connected to each energy storage submodule 121 in the energy storage string; each energy storage submodule 121 of the energy storage string 12 is connected in a loop; the energy storage submodule 121 in the energy storage string includes a charging energy storage submodule SMx, and the charging energy storage submodule SMx is provided with a supplementary energy source U. It should be noted that, Figure 1 The connection relationship between the system controller 11 and the energy storage submodule 121 is not shown.

[0068] In the embodiment of the present application, the energy storage system includes a system controller 11 and an energy storage string 12. The energy storage string 12 includes a plurality of energy storage submodules 121 connected in series, and the system controller 11 is connected to each energy storage submodule 121 respectively.

[0069] One energy storage submodule 121 of the energy storage string 12 is used as a charging energy storage submodule SMx, and another energy storage submodule 121 of the energy storage string 12 is used as a target energy storage submodule SMy to be charged. A supplementary energy source U is provided in the charging energy storage submodule SMx.

[0070] In practical applications, an energy storage submodule 121 may be randomly selected as a charging energy storage submodule SMx, or the charging energy storage submodule SMx may be determined from multiple energy storage submodules 121 according to a control instruction. Similarly, the target energy storage submodule SMy may be determined in the above manner, and in addition, the target energy storage submodule SMy may also be determined according to the remaining power of the energy storage submodule 121, etc.

[0071] It should be noted that the method for determining the charging energy storage submodule and the target energy storage submodule is not limited to the above method, and other methods may also be used.

[0072] The system controller 11 controls each energy storage submodule 121 to form a charging path between the charging energy storage submodule SMx and the target energy storage submodule SMy. Then, the system controller 11 controls the energy replenishment power source U to charge the target energy storage submodule SMy, thereby replenishing energy for the target energy storage submodule SMy.

[0073] In the above embodiment, the energy storage system includes a system controller and an energy storage string, the system controller is connected to each energy storage submodule in the energy storage string; the energy storage submodule in the energy storage string includes a charging energy storage submodule, and the charging energy storage submodule is provided with an energy replenishment power supply; the system controller controls each energy storage submodule so that the energy replenishment power supply replenishes energy for the target energy storage submodule in the energy storage string. In the technical solution of the embodiment of the present application, an energy replenishment power supply is provided in an energy storage submodule of the energy storage string, so that energy can be replenished for another one or more energy storage submodules, and the energy replenishment efficiency can be greatly improved by automatically controlling the energy replenishment. In addition, since there are fewer energy replenishment devices connected, the cost can also be reduced.

[0074] According to some embodiments of the present application, referring to Figure 2 In at least two interconnected energy storage strings 12, the energy storage submodule 121 of the first energy storage string 12 includes a charging energy storage submodule SMx, and the energy storage submodule 121 of the second energy storage string 12 includes a target energy storage submodule SMy. It should be noted that, Figure 2 The connection relationship between the system controller 11 and the energy storage submodule 121 is not shown.

[0075] In an embodiment of the present application, the energy storage string 12 in the energy storage system may be one or more. Optionally, the energy storage system includes a first energy storage string and a second energy storage string connected to each other, the first end of the first energy storage string is connected to the first end of the second energy storage string through a reactor, and the second end of the first energy storage string is connected to the second end of the second energy storage string. In this way, the first energy storage string and the second energy storage string form a path, and the reactor can store energy through the reactor when the power supply voltage of the energy compensation power supply is insufficient, thereby replenishing energy for the energy storage submodule in another energy storage string. Optionally, the second end of the first energy storage string is grounded, and the second end of the second energy storage string is grounded. The first energy storage string and the second energy storage string both include a plurality of energy storage submodules 121 connected in series, and the system controller 11 is respectively connected to each energy storage submodule 121.

[0076] In at least two interconnected energy storage strings 12, one energy storage submodule of the first energy storage string can be used as a charging energy storage submodule SMx, and one energy storage submodule of the second energy storage string can be used as a target energy storage submodule SMy to be charged.

[0077] The system controller 11 controls the charging energy storage submodule SMx to form a charging path between the charging energy storage submodule SMx and the target energy storage submodule SMy. Then, the system controller 11 controls the energy replenishment power source U to charge the target energy storage submodule SMy, thereby replenishing energy for the target energy storage submodule SMy.

[0078] In the above embodiment, in at least two interconnected energy storage strings, the energy storage submodule of the first energy storage string includes a charging energy storage submodule, and the energy storage submodule of the second energy storage string includes a target energy storage submodule; the system controller controls each energy storage submodule so that the energy replenishment power supply replenishes the target energy storage submodule. In the technical solution of the embodiment of the present application, an energy replenishment power supply is provided in an energy storage submodule of an energy storage string, so that the energy storage submodule of another energy storage string can be replenished, and the energy replenishment efficiency can be greatly improved by automatically controlling the energy replenishment. In addition, since there are fewer energy replenishment devices connected, the cost can also be reduced.

[0079] According to some embodiments of the present application, referring to Figure 3, each energy storage submodule 121 includes a power module 1211, the power module 1211 in the charging energy storage submodule SMx is connected in parallel with the energy supplement power source U; the system controller 11 is connected to the energy supplement power source U and each power module 1211 respectively. It should be noted that, Figure 3 The connection relationship between the system controller 11 and the energy storage submodule 121 is not shown.

[0080] In the embodiment of the present application, each energy storage submodule 121 includes a power module 1211. In the charging energy storage submodule SMx, the power module 1211 is connected in parallel with the energy supplement power source U. The system controller 11 is connected to the energy supplement power source U and each power module 1211 respectively.

[0081] During the energy replenishment process, the system controller 11 controls the power module 1211 of the charging energy storage submodule SMx, as well as the power modules 1211 in other energy storage submodules and the power module 1211 in the target energy storage submodule SMy, to form a charging path between the charging energy storage submodule SMx and the target energy storage submodule SMy. Afterwards, the system controller 11 controls the energy replenishment power source U to charge the target energy storage submodule SMy.

[0082] In the above embodiment, each energy storage submodule includes a power module, and the power module in the charging energy storage submodule is connected in parallel with the energy replenishment power supply; the system controller is respectively connected to the energy replenishment power supply and each power module; the system controller controls each power module to form a charging path between the energy replenishment power supply and the target energy storage submodule, and controls the energy replenishment power supply to charge the target energy storage submodule. In the technical solution of the embodiment of the present application, the power modules of each energy storage submodule and the energy replenishment power supply are controlled to automatically replenish the energy storage submodules in the energy storage string, which not only has high energy replenishment efficiency, but also has fewer connected energy replenishment devices and relatively low energy replenishment costs.

[0083] According to some embodiments of the present application, referring to Figure 4 Each energy storage submodule includes a battery unit 1212 , and the battery unit 1212 is connected in parallel with the power module 1211 .

[0084] In the embodiment of the present application, in the energy storage string 12, each energy storage submodule 121 includes a battery unit 1212. In addition, the battery unit 1212 is connected in parallel with the power module 1211.

[0085] During the energy replenishment process, the system controller 11 controls the power module 1211 of the charging energy storage submodule SMx, as well as the power modules 1211 in other energy storage submodules and the power module 1211 in the target energy storage submodule SMy, to form a charging path between the energy replenishment power source U of the charging energy storage submodule SMx and the battery unit 1212 of the target energy storage submodule SMy. Afterwards, the system controller 11 controls the energy replenishment power source U to charge the battery unit 1212 of the target energy storage submodule SMy.

[0086] In the above embodiment, each energy storage submodule includes a battery unit, and the battery unit is connected in parallel with the power module. In the technical solution of the embodiment of the present application, the battery unit is an energy storage component, which can provide electrical energy for the energy storage string to simulate the current and voltage of the real working condition.

[0087] According to some embodiments of the present application, referring to Figure 5 The power module 1211 includes a half-bridge switch circuit, which includes a first switch tube S1, a second switch tube S2, a first diode D1 and a second diode D2; the control electrode of the first switch tube S1 is connected to the system controller 11, the first electrode of the first switch tube S1 is connected to the second electrode of the second switch tube S2, and the second electrode of the first switch tube S1 is connected to the first node J1; the control electrode of the second switch tube S2 is connected to the system controller 11, and the first electrode of the second switch tube S2 is connected to the second node J2; the second node J2 is connected to the common end of the first switch tube S1 and the second switch tube S2 in the next energy storage submodule 121; the anode of the first diode D1 is connected to the first electrode of the first switch tube S1, and the cathode of the first diode D1 is connected to the second electrode of the first switch tube S1; the anode of the second diode D2 is connected to the first electrode of the second switch tube S2, and the cathode of the second diode D2 is connected to the second electrode of the second switch tube S2.

[0088] In the power module of the charging energy storage submodule SMx, the first node J1 is the output end of the energy supplement power source U, and the second node J2 is the input end of the energy supplement power source U. In other energy storage submodules, the first node J1 is the positive terminal of the battery cell 1212, and the second node J2 is the negative terminal of the battery cell 1212. It should be noted that, Figure 5 The connection relationship of the system controller is not shown.

[0089] In some embodiments, reference Figure 6 The power module 1211 includes a bypass switch K1, and the system controller 11 is connected to each bypass switch K1. For any energy storage submodule 121, the system controller 11 controls the bypass switch K1 to close, so that the energy storage submodule 121 can be bypassed. It should be noted that Figure 6 The connection relationship of the system controller is not shown.

[0090] In the technical solution of the embodiment of the present application, the half-bridge switching circuit includes two switching tubes. By controlling the two switching tubes in each energy storage sub-module, a charging path can be formed between the energy replenishment power supply and the target energy storage sub-module, thereby replenishing energy for the target energy storage sub-module. The control method is simple and easy to implement, and the control efficiency is high. Therefore, the energy replenishment efficiency can be improved.

[0091] According to some embodiments of the present application, referring to Figure 7 The power module 121 includes a full-bridge switch circuit, which includes a third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, a sixth switch tube S6, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6; the control electrode of the third switch tube S3 is connected to the system controller 11, the first electrode of the third switch tube S3 is connected to the second electrode of the fourth switch tube S4, and the second electrode of the third switch tube S3 is connected to the first node J1; the control electrode of the fourth switch tube S4 is connected to the system controller 11, and the first electrode of the fourth switch tube S4 is connected to the second node J2; the control electrode of the fifth switch tube S5 is connected to the system controller 11, the first electrode of the fifth switch tube S5 is connected to the second electrode of the sixth switch tube S6, and the second electrode of the fifth switch tube S5 is connected to the first node J1; the control electrode of the sixth switch tube S6 ... The system controller 11 is connected, the first electrode of the sixth switch tube S6 is connected to the second node J2; the common end of the fifth switch tube S5 and the sixth switch tube S6 is connected to the common end of the third switch tube S3 and the fourth switch tube S4 in the next energy storage submodule 121; the anode of the third diode D3 is connected to the first electrode of the third switch tube S3, and the cathode of the third diode D3 is connected to the second electrode of the third switch tube S3; the anode of the fourth diode D4 is connected to the first electrode of the fourth switch tube S4, and the cathode of the fourth diode D4 is connected to the second electrode of the fourth switch tube S4; the anode of the fifth diode D5 is connected to the first electrode of the fifth switch tube S5, and the cathode of the fifth diode D5 is connected to the second electrode of the fifth switch tube S5; the anode of the sixth diode D6 is connected to the first electrode of the sixth switch tube S6, and the cathode of the sixth diode D6 is connected to the second electrode of the sixth switch tube S6.

[0092] In the power module of the charging energy storage submodule SMx, the first node J1 is the output terminal of the energy replenishment, and the second node J2 is the input terminal of the energy replenishment power source U. In the power modules of other energy storage submodules, the first node J1 is the positive terminal of the battery cell 1212, and the second node J2 is the negative terminal of the battery cell 1212. It should be noted that, Figure 7 The connection relationship of the system controller is not shown.

[0093] In some embodiments, reference Figure 8The power module 1211 includes a bypass switch K1, and the system controller 11 is connected to each bypass switch K1. For any energy storage submodule 121, the system controller 11 controls the bypass switch K1 to close, so that the energy storage submodule 121 can be bypassed. It should be noted that Figure 8 The connection relationship of the system controller is not shown.

[0094] In the technical solution of the embodiment of the present application, the full-bridge switching circuit includes four switching tubes. By controlling the four switching tubes in each energy storage sub-module, a charging path can be formed between the energy replenishment power supply and the target energy storage sub-module, thereby replenishing energy for the target energy storage sub-module. The control method is simple and easy to implement, and the control efficiency is high. Therefore, the energy replenishment efficiency can be improved.

[0095] According to some embodiments of the present application, referring to Figure 9a and Figure 9b The battery unit 1212 includes a resistor R, a battery switch K2, a resistor switch K3 and a battery B; the resistor R and the resistor switch K3 are connected in series to form a series circuit, and the series circuit and the battery switch K2 are connected in parallel to form a parallel circuit, the first end of the parallel circuit is the positive terminal of the battery unit 1212, and the first end of the parallel circuit is connected to the first end of the power module 1211, and the second end of the parallel circuit is connected to the positive electrode of the battery B; the negative electrode of the battery B is the negative terminal of the battery unit 1212.

[0096] In the embodiment of the present application, the battery unit 1212 includes a resistor R, a battery switch K2, a resistor switch K3 and a battery B. The resistor R is first connected in series with the resistor switch K3 to form a series circuit, the series circuit is connected in parallel with the battery switch K2 to form a parallel circuit, and the parallel circuit is then connected in series with the battery B.

[0097] In some embodiments, reference Figure 9a and Figure 9b , each energy storage submodule 121 includes a capacitor C, which is connected in parallel with the power module 1211. Before the charging energy storage submodule SMx is connected to the energy replenishment power source U, the system controller 11 first controls the battery unit 1212 of the energy storage submodule 121 to pre-charge the capacitor C. Afterwards, the system controller 11 can control the battery switch K2 to turn off, thereby cutting out the battery unit 1212 in the charging energy storage submodule SMx of the first energy storage string; then control the energy replenishment switch K4 to close, thereby connecting the charging energy storage submodule SMx to the energy replenishment power source U, refer to Fig.10 .

[0098] In the above embodiment, the battery unit includes a resistor, a battery switch, a resistor switch and a battery; the resistor and the resistor switch are connected in series to form a series circuit, the series circuit and the battery switch are connected in parallel to form a parallel circuit, the first end of the parallel circuit is the positive terminal of the battery unit, and the first end of the parallel circuit is connected to the first end of the power module, and the second end of the parallel circuit is connected to the positive electrode of the battery; the negative electrode of the battery is the negative terminal of the battery unit. In the technical solution of the embodiment of the present application, the resistor can play a current limiting role, thereby protecting the battery; the battery switch can cut out the battery and cooperate with energy replenishment, so that the energy replenishment is more in line with actual needs.

[0099] According to some embodiments of the present application, referring to Fig.11 , provides an energy replenishment method. The energy storage system applied in the above embodiment may include the following steps:

[0100] Step 201: determine a target energy storage submodule to be charged from an energy storage system.

[0101] The energy storage system includes a system controller and an energy storage string, and the energy storage string includes multiple energy storage submodules connected in series. The system controller can determine the target energy storage submodule from the multiple energy storage submodules according to user requirements, and can also determine the target energy storage submodule from the multiple energy storage submodules according to the experimental content of the energy storage string push experiment.

[0102] It should be noted that the method for determining the target energy storage submodule is not limited to the above description. In practical applications, other methods may also be used to determine the target energy storage submodule.

[0103] Step 202: Control each energy storage submodule in the energy storage system so that the energy replenishment power source of the charging energy storage submodule replenishes energy for the target energy storage submodule.

[0104] The system controller can cut out the battery in the charging energy storage submodule and then connect it to the energy replenishment power supply. During the energy replenishment process, the system controller controls each energy storage submodule to form a charging path between the charging energy storage submodule and the target energy storage submodule. Afterwards, the system controller controls the energy replenishment power supply to charge the target energy storage submodule, thereby replenishing the target energy storage submodule.

[0105] In the above embodiment, the target energy storage submodule to be charged is determined from the energy storage system; each energy storage submodule in the energy storage system is controlled so that the energy replenishment power supply of the charging energy storage submodule replenishes the target energy storage submodule. In the technical solution of the embodiment of the present application, by setting an energy replenishment power supply in an energy storage submodule of an energy storage string, the energy storage submodule of another energy storage string can be replenished, and the automatic control of energy replenishment can greatly improve the energy replenishment efficiency. In addition, since fewer energy replenishment devices are connected, the cost can also be reduced.

[0106] According to some embodiments of the present application, referring to Fig.12The process of controlling the charging energy storage submodule in the energy storage system so that the energy replenishment power source of the charging energy storage submodule of the energy storage system replenishes energy for the target energy storage submodule may include the following steps:

[0107] Step 301 : Control the power modules in each energy storage submodule to form a charging path from the charging energy storage submodule to the target energy storage submodule.

[0108] Each energy storage submodule includes a power module; in the charging energy storage submodule, the power module is connected in parallel with the energy replenishment power supply; in the target energy storage submodule, the power module is connected in parallel with the battery unit. During the energy replenishment process, the system controller controls the power modules in each energy storage submodule to form a charging path from the energy replenishment power supply of the charging energy storage submodule to the battery unit of the target energy storage submodule.

[0109] Step 302: Control the energy supplement power source to charge the target energy storage submodule.

[0110] The system controller controls the energy replenishment power supply to charge the battery cells of the target energy storage submodule, thereby replenishing energy for the target energy storage submodule.

[0111] In the above embodiment, the power modules in each energy storage submodule are controlled to form a charging path from the charging energy storage submodule to the target energy storage submodule; the energy replenishment power supply is controlled to charge the target energy storage submodule. In the technical solution of the embodiment of the present application, automatic energy replenishment can be achieved by controlling the power modules of the energy storage submodules. The control method is simple and easy to implement, and the control efficiency is high, so the energy replenishment efficiency can be improved.

[0112] According to some embodiments of the present application, referring to Fig.13 The above process of controlling the power modules in each energy storage submodule may include the following steps:

[0113] Step 401 : Control the power modules of the energy storage submodules other than the charging energy storage submodule to switch out the energy storage submodules other than the charging energy storage submodule.

[0114] In practical applications, in order to reduce the impact of other energy storage submodules in the energy storage string on energy replenishment, the system controller can first control the power modules of the energy storage submodules other than the charging energy storage submodules to cut these energy storage submodules out of the energy storage string. Cutting out means not connecting to the energy storage string and disconnecting the electrical connection with other energy storage submodules in the energy storage string.

[0115] In some embodiments, the power module includes a bypass switch, and the system controller can control the bypass switch to close to bypass the energy storage submodule.

[0116] Step 402, controlling the power module of the charging energy storage submodule to connect to the charging energy storage submodule.

[0117] After cutting out other energy storage submodules, the system controller controls the power module in the charging energy storage submodule to connect the charging energy storage submodule to the energy storage string.

[0118] Step 403 , according to the module voltage of the target energy storage submodule and the power supply voltage of the energy supplementation power supply, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule.

[0119] After the charging energy storage submodule is connected, the system controller determines whether the trigger condition is met according to the module voltage of the target energy storage submodule and the power supply voltage of the energy supplement power supply. If the trigger condition is met, the power module of the target energy storage submodule is controlled to connect the target energy storage submodule to the energy storage string to form a charging path from the energy supplement power supply of the charging energy storage submodule to the battery unit of the target energy storage submodule. If the trigger condition is not met, other measures are taken, or the energy storage string is waited for to meet the trigger condition.

[0120] In the above embodiment, the power module of the energy storage submodule other than the charging energy storage submodule is controlled to cut out the energy storage submodule other than the charging energy storage submodule; the power module of the charging energy storage submodule is controlled to connect to the charging energy storage submodule; according to the module voltage of the target energy storage submodule and the power supply voltage of the energy replenishment power supply, the power module of the target energy storage submodule is controlled to connect to the target energy storage submodule. In the technical solution of the embodiment of the present application, by controlling the power modules of each energy storage submodule, only the charging energy storage submodule and the target energy storage submodule can be connected in the energy storage string, so that the charging energy storage submodule charges the target energy storage submodule, which not only has a simple control method, but also has a high energy replenishment efficiency, does not need to connect a large number of devices, and has a relatively low energy replenishment cost.

[0121] According to some embodiments of the present application, the above-mentioned controlling the power module of the target energy storage submodule to connect to the target energy storage submodule according to the module voltage of the target energy storage submodule and the power supply voltage of the energy compensation power supply may include: when the power supply voltage is greater than or equal to the module voltage, controlling the power module of the target energy storage submodule to connect to the target energy storage submodule.

[0122] Since the target energy storage submodule can be charged only when the charging voltage applied to the target energy storage submodule is greater than or equal to the module voltage of the target energy storage submodule, the trigger condition for controlling the target energy storage submodule may include that the power supply voltage is greater than or equal to the module voltage.

[0123] Each energy storage submodule may be provided with a module controller and a data acquisition device connected to each other, and the module controller of each energy storage submodule is connected to the system controller. In each energy storage submodule, the data acquisition device collects data such as current and voltage of the energy storage submodule, and transmits these data to the module controller. The system controller obtains the data of each energy storage submodule from each module controller, and then determines whether the power supply voltage of the energy supplement power supply is greater than or equal to the module voltage of the target energy storage submodule based on these data.

[0124] When the power supply voltage of the energy supplement power supply is greater than or equal to the module voltage of the target energy storage submodule, it indicates that the charging voltage applied to the target energy storage submodule can charge the target energy storage submodule. Then, the system controller controls the power module of the target energy storage submodule, connects the target energy storage submodule to the energy storage string, and forms a charging path from the charging energy storage submodule to the target energy storage submodule.

[0125] In the above embodiment, when the power supply voltage is greater than or equal to the module voltage, the power module of the target energy storage submodule is controlled to connect to the target energy storage submodule. In the technical solution of the embodiment of the present application, if the power supply voltage is greater than or equal to the module voltage, the target energy storage submodule can be directly connected to the energy storage string, thereby quickly replenishing the target energy storage submodule.

[0126] According to some embodiments of the present application, the above-mentioned process of controlling the power module of the target energy storage submodule to connect to the target energy storage submodule according to the module voltage of the target energy storage submodule and the power supply voltage of the energy compensation power supply may include: when the power supply voltage is less than the module voltage, if the inductor current in the energy storage system reaches a preset current value, controlling the power module of the target energy storage submodule to connect to the target energy storage submodule.

[0127] In the energy storage system, one end of at least two energy storage strings is connected through a reactor, and the other end is grounded. The reactor can store energy, and is usually controlled by a constant current, that is, as the energy stored in the reactor increases, the current flowing through the reactor increases until it reaches a preset current value. It can be understood that if it is detected that the current flowing through the reactor reaches the preset current value, it indicates that the reactor has accumulated the preset energy.

[0128] After the charging energy storage submodule is connected to the energy storage string, the system controller determines whether the power supply voltage of the energy supplement power source is greater than or equal to the module voltage of the target energy storage submodule. If the power supply voltage of the energy supplement power source is less than the module voltage of the target energy storage submodule, it indicates that the charging voltage applied to the target energy storage submodule may not be sufficient to charge the target energy storage submodule.

[0129] If the current of the reactor reaches the preset current value, it indicates that the reactor has accumulated the preset energy. In this case, the charging voltage applied to the target energy storage submodule can charge the target energy storage submodule, and the system controller controls the power module of the target energy storage submodule to connect the target energy storage submodule to the energy storage string to form a charging path from the charging energy storage submodule to the target energy storage submodule. If the current of the reactor does not reach the preset current value, the current of the reactor can be waited for to increase until the current of the reactor reaches the preset current value, and then the target energy storage submodule is controlled.

[0130] In the above embodiment, when the power supply voltage is less than the module voltage, if the reactor current in the energy storage system reaches a preset current value, the power module of the target energy storage submodule is controlled to connect to the target energy storage submodule. In the technical solution of the embodiment of the present application, the charging voltage applied to the target energy storage submodule meets the charging demand of the target energy storage submodule through the reactor, thereby improving the reliability of energy replenishment and achieving a better energy replenishment effect.

[0131] According to some embodiments of the present application, referring to Fig.14 In the case where the power module is a half-bridge switch circuit, the process of cutting out the energy storage submodules other than the charging energy storage submodule and connecting the charging energy storage submodule and the target energy storage submodule may include the following steps:

[0132] Step 501, controlling the first switch tube of the energy storage submodule other than the charging energy storage submodule to be turned off and the second switch tube to be turned on.

[0133] Step 502, control the first switch tube of the charging energy storage submodule to be turned on, and the second switch tube to be turned off.

[0134] Step 503, control the first switch tube of the target energy storage submodule to be turned on, and the second switch tube to be turned off.

[0135] In an embodiment of the present application, the first switch tube in the energy storage submodule other than the charging energy storage submodule is first controlled to be turned off, and the second switch tube is controlled to be turned on, so that these energy storage submodules are cut out of the energy storage string to avoid affecting the energy replenishment. Afterwards, the first switch tube of the charging energy storage submodule is controlled to be turned on, and the second switch tube is turned off, and the charging energy storage submodule is connected to the energy storage string. Next, in the case where the power supply voltage of the energy replenishment power supply is greater than or equal to the module voltage of the target energy storage submodule, the first switch tube of the target energy storage submodule is controlled to be turned on, and the second switch tube is turned off, and the target energy storage submodule is connected to the energy storage string. Alternatively, in the case where the power supply voltage of the energy replenishment power supply is less than the module voltage of the target energy storage submodule, if the reactor current in the energy storage system reaches a preset current value, the first switch tube of the target energy storage submodule is controlled to be turned on, and the second switch tube is turned off, and the target energy storage submodule is connected to the energy storage string. After the above control, the following can be formed. Fig.15a and 15bThe charging path shown.

[0136] In the above embodiment, the first switch tube of the energy storage submodule other than the charging energy storage submodule is controlled to be turned off and the second switch tube is turned on; the first switch tube of the charging energy storage submodule is controlled to be turned on and the second switch tube is turned off; the first switch tube of the target energy storage submodule is controlled to be turned on and the second switch tube is turned off. In the technical solution of the embodiment of the present application, a charging path from the charging energy storage submodule to the target energy storage submodule is formed by controlling the switch tubes in each energy storage submodule. In this way, each energy storage submodule that needs to be replenished can be automatically replenished, which not only has high replenishment efficiency, but also has relatively low replenishment cost.

[0137] According to some embodiments of the present application, referring to Fig.16 In the case where the power module is a full-bridge switch circuit, the process of cutting out the energy storage submodules other than the charging energy storage submodule and connecting the charging energy storage submodule and the target energy storage submodule may include the following steps:

[0138] Step 601, control the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule to be turned on, and the fourth switch tube and the sixth switch tube to be turned off; or control the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule to be turned off, and the fourth switch tube and the sixth switch tube to be turned on.

[0139] Step 602, control the third switch tube and the sixth switch tube of the charging energy storage submodule to be turned on, and the fourth switch tube and the fifth switch tube to be turned off.

[0140] Step 603 , controlling the third switch tube and the sixth switch tube of the target energy storage submodule to be turned on, and the fourth switch tube and the fifth switch tube to be turned off.

[0141] In the embodiment of the present application, the third switch tube and the fifth switch tube in the energy storage sub-module except the charging energy storage sub-module are first controlled to be turned on, and the fourth switch tube and the sixth switch tube are turned off; or, the third switch tube and the fifth switch tube of these energy storage sub-modules are controlled to be turned off, and the fourth switch tube and the sixth switch tube are turned on, so that these energy storage sub-modules are cut out of the energy storage string to avoid affecting the energy replenishment.

[0142] Afterwards, the third switch tube and the sixth switch tube of the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off, so that the charging energy storage submodule is connected to the energy storage string.

[0143] Next, when the power supply voltage of the energy compensation power supply is greater than or equal to the module voltage of the target energy storage submodule, the third switch tube and the sixth switch tube of the target energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off, and the target energy storage submodule is connected to the energy storage string. Alternatively, when the power supply voltage of the energy compensation power supply is less than the module voltage of the target energy storage submodule, if the reactor current in the energy storage system reaches the preset current value, the third switch tube and the sixth switch tube of the target energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off, and the target energy storage submodule is connected to the energy storage string. After the above control, the following can be formed. Fig.17a and 17b The charging path shown.

[0144] In the above embodiment, the third switch tube and the fifth switch tube of the energy storage submodule outside the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the sixth switch tube are turned off; or, the third switch tube and the fifth switch tube of the energy storage submodule outside the charging energy storage submodule are controlled to be turned off, and the fourth switch tube and the sixth switch tube are turned on. The third switch tube and the sixth switch tube of the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off. The third switch tube and the sixth switch tube of the target energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off. In the technical solution of the embodiment of the present application, a charging path from the charging energy storage submodule to the target energy storage submodule is formed by controlling the switch tubes in each energy storage submodule. In this way, each energy storage submodule that needs to be replenished can be automatically replenished, which not only has high energy replenishment efficiency, but also has relatively low energy replenishment cost.

[0145] According to some embodiments of the present application, referring to Fig.18 The above process of determining the target energy storage submodule to be charged from the energy storage system may include the following steps:

[0146] Step 701, obtaining the charge state of each energy storage submodule.

[0147] Among them, the state of charge (SOC) is the ratio of the remaining capacity of the battery after it has been used for a period of time or has been left unused for a long time to its capacity in a fully charged state, usually expressed as a percentage. Its value range is 0% to 100%. When SOC = 0%, it means that the battery is fully discharged, and when SOC = 100%, it means that the battery is fully charged.

[0148] Each energy storage submodule may be provided with a module controller and a data acquisition device connected to each other. The data acquisition device may collect data such as current and voltage of the energy storage submodule and transmit the data to the module controller. The module controller may determine the charge state of the energy storage submodule based on the data.

[0149] The system controller is connected to each module controller, and the system controller can obtain the charge state of each energy storage submodule from each module controller.

[0150] Step 702: Determine a target energy storage submodule according to a plurality of charge states.

[0151] The system controller may determine a target energy storage submodule from the plurality of energy storage submodules according to a preset charge threshold, for example, determining an energy storage submodule whose state of charge is lower than the preset charge threshold as the target energy storage submodule.

[0152] The system controller may also sort the multiple charge states in ascending order, and determine the energy storage submodule corresponding to the minimum charge state as the target energy storage submodule.

[0153] It should be noted that the method for determining the target energy storage submodule is not limited to the above description, and in practical applications, other methods may also be used.

[0154] In the above embodiment, the charge state of each energy storage submodule is obtained; and the target energy storage submodule is determined according to the multiple charge states. In the technical solution of the embodiment of the present application, the target energy storage submodule is determined according to the charge state, which is more in line with the actual energy replenishment demand, and thus the energy replenishment efficiency can be improved.

[0155] According to some embodiments of the present application, a method for replenishing energy is provided, which is described by taking the method applied to the energy storage system of the above embodiment as an example, and may include the following steps:

[0156] Step 1: Obtain the state of charge of each energy storage submodule.

[0157] Step 2: Determine the target energy storage submodule according to multiple charge states.

[0158] Step 3: Control the power modules of the energy storage submodules other than the charging energy storage submodule to cut out the energy storage submodules other than the charging energy storage submodule.

[0159] In the case where the power module is a half-bridge switch circuit, the first switch tube of the energy storage submodule other than the charging energy storage submodule is controlled to be turned off and the second switch tube is turned on.

[0160] When the power module is a full-bridge switching circuit, the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the sixth switch tube are turned off; or, the third switch tube and the fifth switch tube of the energy storage submodule other than the charging energy storage submodule are controlled to be turned off, and the fourth switch tube and the sixth switch tube are turned on.

[0161] Step 4: Control the power module of the charging energy storage submodule to connect to the charging energy storage submodule.

[0162] When the power module is a half-bridge switch circuit, the first switch tube of the charging energy storage submodule is controlled to be turned on and the second switch tube is turned off.

[0163] When the power module is a full-bridge switch circuit, the third switch tube and the sixth switch tube of the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off.

[0164] Step 5: When the power supply voltage is greater than or equal to the module voltage, control the power module of the target energy storage submodule to connect to the target energy storage submodule.

[0165] When the power module is a half-bridge switch circuit, the first switch tube of the target energy storage submodule is controlled to be turned on and the second switch tube is turned off.

[0166] When the power module is a half-bridge switch circuit, the third switch tube and the sixth switch tube of the target energy storage submodule are controlled to be turned on, and the fourth switch tube and the fifth switch tube are turned off.

[0167] Step 6: When the power supply voltage is less than the module voltage, if the reactor in the energy storage system meets the current reaching the preset current value, the power module of the target energy storage submodule is controlled to connect to the target energy storage submodule.

[0168] After the target energy storage submodule is charged, step 1 may be performed to re-determine the target energy storage submodule to be charged and to charge the new target energy storage submodule.

[0169] In the technical solution of the embodiment of the present application, by setting a supplementary power supply in one energy storage submodule of an energy storage string, the energy storage submodule of another energy storage string can be supplemented. Compared with the traditional technology, the automatic control supplementary energy can greatly improve the supplementary energy efficiency. In addition, since fewer supplementary energy devices are connected, the cost can also be reduced.

[0170] It should be understood that, although the various steps in the above flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above flowchart may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0171] According to some embodiments of the present application, an electronic device is provided, which may be a system controller in an energy storage system. The internal structure diagram of the electronic device may be as follows: Fig.19 As shown. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program, wherein the computer program can be used to implement the above-mentioned functions such as inputting data, performing calculations, and outputting results. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method of replenishing energy is implemented.

[0172] Those skilled in the art will understand that Fig.19 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0173] According to some embodiments of the present application, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, and the instructions can be executed by a processor of an electronic device to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0174] According to some embodiments of the present application, a computer program product is also provided, and when the computer program is executed by a processor, the above method can be implemented. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, part or all of the above method can be implemented in whole or in part according to the process or function described in the embodiment of the present application.

[0175] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are 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.

[0176] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solutions of the present application in detail, but cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the protection scope of the attached claims described in the present application. Therefore, the protection scope of the patent of this application shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. An energy storage system, characterized in that: The energy storage system includes a system controller and an energy storage string, wherein the system controller is connected to each energy storage submodule in the energy storage string; the energy storage submodules in the energy storage string are connected in a loop, and the energy storage submodules in the energy storage string include a charging energy storage submodule, and the charging energy storage submodule is provided with an energy supplement power supply.

2. The energy storage system according to claim 1, characterized in that: In at least two interconnected energy storage strings, the energy storage submodule of a first energy storage string includes the charging energy storage submodule, and the energy storage submodule of a second energy storage string includes a target energy storage submodule.

3. The energy storage system according to claim 2, characterized in that: Each of the energy storage submodules includes a power module, and the power module in the charging energy storage submodule is connected in parallel with the energy supplement power supply; the system controller is connected to the energy supplement power supply and each of the power modules respectively.

4. The energy storage system according to claim 3, characterized in that: Each of the energy storage submodules includes a battery unit, and the battery unit is connected in parallel with the power module.

5. The energy storage system according to any one of claims 2 to 4, characterized in that: The first end of the first energy storage string is connected to the first end of the second energy storage string through a reactor, and the second end of the first energy storage string is connected to the second end of the second energy storage string.

6. The energy storage system according to claim 5, characterized in that: A second end of the first energy storage string is grounded, and a second end of the second energy storage string is grounded.

7. A method for replenishing energy, characterized in that: Applied to the energy storage system according to any one of claims 1 to 6, the method comprises: Determining a target energy storage submodule to be charged from the energy storage system; Control each energy storage submodule in the energy storage system so that the energy replenishment power supply of the charging energy storage submodule of the energy storage system replenishes energy for the target energy storage submodule.

8. The method according to claim 7, characterized in that The controlling each energy storage submodule in the energy storage system so that the energy replenishment power supply of the charging energy storage submodule of the energy storage system replenishes energy for the target energy storage submodule includes: Controlling the power modules in each of the energy storage submodules to form a charging path from the charging energy storage submodule to the target energy storage submodule; Control the energy supplement power supply to charge the target energy storage submodule.

9. The method according to claim 7, characterized in that: The controlling the power modules in each of the energy storage submodules comprises: Controlling the power modules of the energy storage submodules other than the charging energy storage submodule to cut out the energy storage submodules other than the charging energy storage submodule; Controlling the power module of the charging and energy storage submodule to connect to the charging and energy storage submodule; According to the module voltage of the target energy storage submodule and the power supply voltage of the energy supplementation power supply, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule.

10. The method according to claim 9, characterized in that The controlling the power module of the target energy storage submodule to connect to the target energy storage submodule according to the module voltage of the target energy storage submodule and the power supply voltage of the energy supplement power supply comprises: When the power supply voltage is greater than or equal to the module voltage, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule.

11. The method according to claim 9, characterized in that The controlling the power module of the target energy storage submodule to connect to the target energy storage submodule according to the module voltage of the target energy storage submodule and the power supply voltage of the energy supplement power supply comprises: In the case where the power supply voltage is less than the module voltage, if the current of the reactor of the energy storage system reaches a preset current value, the power module of the target energy storage submodule is controlled to be connected to the target energy storage submodule.

12. The method according to any one of claims 9 to 11, characterized in that: The controlling the power module of the energy storage submodule other than the charging energy storage submodule to cut out the energy storage submodule other than the charging energy storage submodule comprises: In the case where the power module is a half-bridge switch circuit, the first switch tube of the energy storage submodule other than the charging energy storage submodule is controlled to be turned off and the second switch tube is turned on; When the power module is a full-bridge switch circuit, the third switch tube and the fifth switch tube of the energy storage submodule outside the charging energy storage submodule are controlled to be turned on, and the fourth switch tube and the sixth switch tube are turned off; or, the third switch tube and the fifth switch tube of the energy storage submodule outside the charging energy storage submodule are controlled to be turned off, and the fourth switch tube and the sixth switch tube are turned on.

13. The method according to claim 7, characterized in that The step of determining a target energy storage submodule to be charged from the energy storage system includes: Obtaining the charge state of each of the energy storage submodules; The target energy storage submodule is determined according to the multiple charge states.

14. 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 method according to any one of claims 7 to 13 is implemented.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 7 to 13 is implemented.

16. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method described in any one of claims 7 to 13 is implemented.

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