Energy storage module, energy storage system and power system

Abstract

The utility model relates to an energy storage module, an energy storage system and a power system, and the energy storage module comprises a power conversion circuit, a support circuit, an energy storage unit and an impedance circuit. The power conversion circuit, the support circuit and the energy storage unit are arranged in parallel; the impedance circuit comprises at least one impedance element, and the at least one impedance element is arranged between the power conversion circuit and the energy storage unit. Under-damped oscillation between the power conversion circuit and the energy storage unit can be suppressed, so that the situation that charging and discharging currents of the energy storage unit exceed rated operation currents due to oscillation currents is slowed down, abnormal attenuation of the service life of the energy storage unit is reduced, and the operation reliability of the energy storage module is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage module, an energy storage system, and a power system. Background Art

[0002] With the development of large-scale energy storage, energy storage systems have gradually been widely used.

[0003] In related technologies, an energy storage system includes multiple energy storage modules, each of which includes an energy storage unit. In practice, the charging and discharging of the energy storage units in each energy storage module can be achieved by controlling the switching status of each energy storage module.

[0004] However, in the related art, the reliability of the energy storage module is low. Utility Model Content

[0005] Based on this, it is necessary to provide an energy storage module, an energy storage system and a power system to address the above technical problems, which can improve the reliability of the energy storage module.

[0006] In a first aspect, an embodiment of the present application provides an energy storage module, which includes a power conversion circuit, a support circuit, an energy storage unit and an impedance circuit; the power conversion circuit, the support circuit and the energy storage unit are arranged in parallel; the impedance circuit includes at least one impedance element, and the at least one impedance element is arranged between the power conversion circuit and the energy storage unit.

[0007] In the above solution, an impedance circuit consisting of at least one impedance element is provided between the power conversion circuit and the energy storage unit. During the operation of the energy storage module, the addition of the impedance circuit can suppress underdamped oscillations between the power conversion circuit and the energy storage unit, thereby mitigating the situation in which the charging and discharging currents of the energy storage unit exceed the rated operating current due to the oscillating current, reducing the abnormal attenuation of the energy storage unit life, and thereby improving the operational reliability of the energy storage module.

[0008] In one embodiment, the at least one impedance element includes a plurality of impedance elements, and a resonant network is formed between the plurality of impedance elements.

[0009] In the above solution, when the impedance circuit has multiple impedance elements, a resonant network is formed between the multiple impedance elements, thereby reducing the current gain of the energy storage unit in the equivalent network of the entire energy storage module, thereby suppressing the underdamped oscillation of the energy storage module.

[0010] In one embodiment, the multiple impedance elements include a first resistive element, a first inductive element, and a first capacitive element. The first resistive element and the first inductive element are both arranged on the main circuit of the energy storage module, and the first capacitive element is arranged on a branch circuit of the energy storage module.

[0011] The above solution arranges the first resistive element and the first inductive element on the main circuit, and the first capacitive element on the branch circuit, so that the first resistive element and the first inductive element are connected in series with the first capacitive element, thereby forming a resonant network, reducing the current gain in the energy storage module, achieving the suppression of underdamped oscillations, and having high operational reliability.

[0012] In one embodiment, the first resistive element is arranged on the main loop between the first end of the power conversion circuit and the first end of the support circuit, the first capacitive element is arranged on the branch connected in parallel between the support circuit and the energy storage unit, and the first inductive element is arranged on the main loop between the first end of the first capacitive element and the first end of the energy storage unit.

[0013] In the above solution, a first resistive element is arranged on the main circuit between the first end of the power conversion circuit and the first end of the support circuit, a first capacitive element is arranged on the branch connected in parallel between the support circuit and the energy storage unit, and a first inductive element is arranged on the main circuit between the first end of the first capacitive element and the first end of the energy storage unit. As a result, the first resistive element and the first inductive element are connected in series with the first capacitive element, thereby forming a resonant network, reducing the current gain in the energy storage module, suppressing underdamped oscillations, and having high operational reliability.

[0014] In one embodiment, the first inductive element is arranged on the main circuit between the first end of the power conversion circuit and the first end of the support circuit, the first capacitive element is arranged on the branch connected in parallel between the support circuit and the energy storage unit, and the first resistive element is arranged on the main circuit between the first end of the first capacitive element and the first end of the energy storage unit.

[0015] In the above solution, the positions of the first resistive element and the first inductive element are swapped, but the first resistive element and the first inductive element can still be connected in series with the first capacitive element to form a resonant network, thereby reducing the current gain in the energy storage module while increasing the flexibility of setting the impedance element in the energy storage module.

[0016] In one embodiment, the first resistive element is arranged on the main loop between the first end of the power conversion circuit and the first end of the support circuit, the first inductive element is arranged on the main loop between the second end of the power conversion circuit and the second end of the support circuit; and the first capacitive element is arranged on the branch connected in parallel between the support circuit and the energy storage unit.

[0017] In the above scheme, the first inductive element is positioned on the main loop of the second end of the power conversion circuit. In this way, the first resistive element, the first capacitive element, and the first inductive element are connected in series to form a resonant network, thereby reducing the current gain in the energy storage module while increasing the flexibility of the impedance element in the energy storage module.

[0018] In one embodiment, the first capacitive element is arranged in a parallel branch between the support circuit and the energy storage unit, the first resistive element and the first inductive element are connected in series, and the series-connected first resistive element and the first inductive element are arranged in a main loop between the first end of the first capacitive element and the first end of the energy storage unit.

[0019] The above solution connects the first inductive element and the first resistive element in series and arranges them in the main loop between the first end of the first capacitive element and the first end of the energy storage unit, so that the first resistive element, the first capacitive element and the first inductive element are connected in series to form a resonant network, which reduces the current gain in the energy storage module while increasing the flexibility of the arrangement of the impedance element in the energy storage module.

[0020] In one embodiment, the plurality of impedance elements include a first resistive element, a first inductive element, and a first capacitive element, and the first resistive element, the first inductive element, and the first capacitive element are all disposed on a branch of the energy storage module.

[0021] The above solution arranges the first resistive element, the first inductive element and the first capacitive element all on the branch circuit, which can effectively reduce the circuit volume, reduce the circuit cost, and improve the convenience of replacing the impedance element in the impedance circuit.

[0022] In one embodiment, the first resistive element, the first inductive element, and the first capacitive element are connected in series as a branch connected in parallel between the support circuit and the energy storage unit.

[0023] In the above scheme, the first resistive element, the first inductive element and the first capacitive element are connected in series and then connected in parallel as a branch between the support circuit and the energy storage unit, that is, the resistance, inductance and capacitance damping resonance in series is used to achieve the suppression of under-damped oscillation, and can also effectively reduce the circuit volume and reduce the circuit cost.

[0024] In one embodiment, the at least one impedance element includes a plurality of impedance elements, the supporting circuit includes a supporting capacitor, and the plurality of impedance elements and the supporting capacitor form a resonant network.

[0025] In the above scheme, when the impedance circuit has multiple impedance elements, the multiple impedance elements can also form a resonant network with the support capacitors in the support circuit, thereby reducing the current gain of the energy storage unit in the equivalent network of the entire energy storage module and suppressing the under-damped oscillation of the energy storage module.

[0026] In one embodiment, the plurality of impedance elements include a second resistive element and a second inductive element, and the second resistive element and the second inductive element are both provided on the main circuit of the energy storage module.

[0027] In this solution, the second resistive element and the second inductive element can be located entirely within the main circuit of the energy storage module. This allows them to form a resonant network in conjunction with the supporting capacitors, thereby reducing the current gain of the energy storage cells in the equivalent network of the entire energy storage module and suppressing underdamped oscillations in the energy storage module. Furthermore, because no additional capacitive elements are required, the cost and size of the energy storage module can be effectively reduced.

[0028] In one embodiment, the second resistive element is arranged on the main loop between the first end of the power conversion circuit and the first end of the support circuit, and the second inductive element is arranged on the main loop between the second end of the power conversion circuit and the second end of the support capacitor.

[0029] The above solution only adds a second resistive element and a second inductive element to the main loops on both sides of the power conversion circuit and the support capacitor, respectively, thus forming a resonant network. This reduces the current gain of the energy storage module while effectively reducing the cost and volume of the energy storage module.

[0030] In one embodiment, the second resistive element is arranged on the main loop between the first end of the support circuit and the first end of the energy storage unit, and the second inductive element is arranged on the main loop between the second end of the support capacitor and the second end of the energy storage unit.

[0031] The above solution replaces the second resistive element and the second inductive element to the main circuit between the supporting capacitor and the energy storage unit, making the position setting of the second resistive element and the second inductive element more flexible.

[0032] In one embodiment, the second resistive element and the second inductive element are connected in series, and the second resistive element and the second inductive element connected in series are arranged in a main loop between the first end of the support capacitor and the first end of the energy storage unit.

[0033] In the above scheme, the second inductive element and the second resistive element are connected in series on the main loop between the first end of the support capacitor and the first end of the energy storage unit, forming a series connection with the support capacitor to form a resonant circuit, thereby reducing the current gain of the energy storage module and suppressing the underdamped oscillation of the energy storage module.

[0034] In one embodiment, the at least one impedance element includes an impedance element, and the impedance element forms a resonant network with a target portion of the energy storage module, where the target portion refers to a portion of the energy storage module excluding the power conversion circuit.

[0035] The above solution only provides one impedance element in the impedance circuit. This impedance element forms a resonant network with all parts of the energy storage module except the power conversion circuit, which reduces the current gain in the energy storage module, thereby suppressing the underdamped oscillation of the energy storage module and improving the operational reliability of the energy storage module.

[0036] In one embodiment, an impedance element includes a third inductive element, and the third inductive element is disposed between the first end of the support capacitor and the first end of the energy storage unit.

[0037] The above solution simply adds a third inductive element to the main loop between the first end of the support circuit and the first end of the energy storage unit. This creates a resonant network between the third inductive element and the components of the energy storage module other than the power conversion circuit. This results in a lower current gain in the energy storage module, thereby suppressing underdamped oscillations and improving the module's operational reliability. Furthermore, the addition of only one third inductive element significantly reduces costs and reduces the size of the energy storage module.

[0038] In one embodiment, an impedance element includes a third resistive element, and the third resistive element is arranged between the first end of the support capacitor and the first end of the energy storage unit.

[0039] The above solution simply adds a third resistive element to the main loop between the first end of the support circuit and the first end of the energy storage unit. This creates a resonant network between the third resistive element and the components of the energy storage module excluding the power conversion circuit. This results in a lower current gain in the energy storage module, thereby suppressing underdamped oscillations and improving the module's operational reliability. Furthermore, the addition of only one third resistive element significantly reduces costs and reduces the size of the energy storage module.

[0040] In one embodiment, an impedance element includes a second capacitive element, and the second capacitive element is provided in a branch connected in parallel between the support capacitor and the energy storage unit.

[0041] In this solution, a resonant network is formed between the second capacitive element and the energy storage module's components other than the power conversion circuit. This reduces the module's current gain and suppresses underdamped oscillations, thereby improving its operational reliability. Similarly, the addition of only one second capacitive element significantly reduces costs and reduces the size of the energy storage module.

[0042] In one embodiment, a fourth resistive element is further connected in series to the branch where the second capacitive element is located.

[0043] The above solution connects a fourth resistive element in series with the branch where the second capacitive element is located, thereby enhancing the amplitude of the resonant network in reducing the current gain of the energy storage module, thereby greatly suppressing the underdamped oscillation of the energy storage module and improving the operational reliability of the energy storage module.

[0044] In a second aspect, an embodiment of the present application provides an energy storage system, which includes the energy storage module provided in any one of the embodiments of the first aspect above.

[0045] Because the energy storage system in the above solution includes the energy storage module provided by the embodiment of the present application, the operational reliability of the energy storage system is greatly increased.

[0046] In a second aspect, an embodiment of the present application provides a power system, which includes the energy storage system provided in the embodiment of the second aspect above.

[0047] The operational reliability of each energy storage system in the above scheme greatly guarantees the operational reliability of the power system.

[0048] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustration purposes only and are not to be construed as limiting the present application. The same reference numerals are used throughout the accompanying drawings to represent the same components.

[0050] Figure 1 Schematic diagram of the topological structure of an energy storage module in one embodiment;

[0051] Figure 2 Schematic diagram of an equivalent network structure of an energy storage module in one embodiment;

[0052] Figure 3 This is a structural diagram of an energy storage module in one embodiment of the present application;

[0053] Figure 4 This is a schematic diagram of the structure of a power conversion circuit in one embodiment of the present application;

[0054] Figure 5 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0055] Figure 6 This is a schematic diagram of the component topology of an energy storage module in one embodiment of the present application;

[0056] Figure 7 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0057] Figure 8 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0058] Figure 9 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0059] Figure 10 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0060] Figure 11 A schematic structural diagram of an energy storage module in another embodiment of the present application;

[0061] Figure 12 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0062] Figure 13 A schematic structural diagram of an energy storage module in another embodiment of the present application;

[0063] Figure 14 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0064] Figure 15 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0065] Figure 16 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0066] Figure 17 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0067] Figure 18 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0068] Figure 19 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0069] Figure 20 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0070] Figure 21 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0071] Figure 22 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0072] Figure 23 This is a structural diagram of an energy storage module in another embodiment of the present application;

[0073] Figure 24 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0074] Figure 25This is a structural diagram of an energy storage module in another embodiment of the present application;

[0075] Figure 26 This is a schematic diagram of the component topology structure of an energy storage module in another embodiment of the present application;

[0076] Figure 27 This is a schematic diagram of the component topology of an energy storage module in another embodiment of the present application.

[0077] Description of reference numerals:

[0078] 101: Power conversion circuit;

[0079] 102: Support circuit;

[0080] 103: Energy storage unit;

[0081] 104: Impedance circuit;

[0082] 1041: a first resistive element;

[0083] 1042: first inductive element;

[0084] 1043: first capacitive element;

[0085] 1045: second resistive element;

[0086] 1046: second inductive element;

[0087] 1047: Third inductive element;

[0088] 1048: third resistive element;

[0089] 1049: second capacitive element;

[0090] 10410: Fourth resistive element. DETAILED DESCRIPTION

[0091] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0092] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and any variations thereof in the specification and claims of this application and the above-mentioned illustrations are intended to cover non-exclusive inclusions. In the description of the embodiments of this application, the technical terms "first", "second", "third", "fourth", 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 this application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0093] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0094] In the description of the embodiments of this application, unless otherwise specified or limited, technical terms such as "connection" should be understood in a broad sense. For example, it can refer to direct connection or indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0095] With the development of energy storage systems, they are becoming increasingly modular in many scenarios. This means that multiple energy storage modules are connected to form a system. For example, in a high-voltage direct-mounted energy storage system, each energy storage module consists of both a power supply and an energy storage component. Multiple energy storage modules are connected in a cascaded fashion to form a high-voltage direct-mounted energy storage system. Therefore, the reliable operation of each energy storage module directly impacts the operation of the energy storage system, making improving the operational reliability of energy storage modules particularly important.

[0096] In related technologies, the topology of each energy storage module is as follows: Figure 1 As shown, the power part includes a power conversion circuit 101 and a support circuit 102, and the energy storage part includes an energy storage unit 103, wherein the support circuit 102 includes a support capacitor C. Figure 1 S1 and S2 represent two connection ports. Each energy storage module needs to be connected to the main circuit of the energy storage system through the two connection ports S1 and S2, so as to be connected to the power grid through the main circuit.

[0097] Typically, there is a relatively large equivalent internal resistance Rdc and equivalent stray inductance L inside the energy storage unit 103. The equivalent internal resistance Rdc and equivalent stray inductance L are derived not only from the connecting bar inside the energy storage unit 103, but also from the busbar connecting the energy storage unit 103 and the power conversion circuit 101 in the entire energy storage module topology. Figure 2 As shown, L represents the equivalent stray inductance of the energy storage unit 103 and / or the equivalent stray inductance of the bus in the energy storage module, Rdc represents the internal resistance of the energy storage unit 103 and / or the internal resistance of the bus, and Represent the current of energy storage unit 103 and power conversion circuit 101 respectively. Figure 2 As can be seen, the equivalent topology of the equivalent resistance Rdc, equivalent stray inductance L, and support capacitor C in the energy storage module can be viewed as an RLC network. The energy storage module operates in two modes within the entire energy storage system: on-state and off-state. When the energy storage module switches between on-state and off-state, current from the energy storage system's main circuit enters the energy storage module. This current, passing through the power conversion circuit 101, can be viewed as a step current source excitation I / P for the equivalent RLC network.

[0098] Due to the large equivalent stray inductance, the inductive reactance of the equivalent stray inductance L in the energy storage module does not match the capacitive reactance of the support capacitor C. In this case, once under the step current source excitation I / P, the mismatch between the inductive reactance of the equivalent stray inductance L and the capacitive reactance of the support capacitor C will cause the entire RLC network to undergo underdamped oscillation, forming an underdamped network, thereby causing underdamped oscillation in the support capacitor and the energy storage unit 103.

[0099] During the operation of the energy storage module, when executing the conversion between the input and output working modes, the supporting capacitor C, the equivalent internal resistance Rdc and the equivalent stray inductance L will cause underdamped oscillation, resulting in an oscillating current in the energy storage unit 103, and then the charging and discharging current of the energy storage unit 103 will exceed the rated operating current, which can easily cause the energy storage unit 103 to overcurrent, damage, deteriorate, and abnormally reduce its service life, thereby reducing the operational reliability of the energy storage module.

[0100] In order to alleviate the problem of low operating reliability of the energy storage module caused by the above-mentioned underdamped oscillation, the topology of the energy storage module can be improved, and an oscillation suppression circuit can be added to the energy storage module to reduce the current gain of the energy storage unit 103 when the energy storage module switches between the input and output working modes, thereby suppressing the underdamped oscillation caused by the internal resistive elements and integrated inductive elements between the support capacitor C and the energy storage unit 103, thereby greatly reducing the harm caused by the underdamped oscillation to the energy storage module, thereby improving the reliability of the energy storage module.

[0101] The detailed implementation process of the energy storage module provided by this application is described below through specific embodiments. Figure 3 As shown, a topological schematic diagram of an energy storage module is provided in an embodiment of the present application.

[0102] The energy storage module includes a power conversion circuit 101, a support circuit 102, an energy storage unit 103 and an impedance circuit 104; the power conversion circuit 101, the support circuit 102 and the energy storage unit 103 are arranged in parallel; the impedance circuit 104 includes at least one impedance element, and the at least one impedance element is arranged between the power conversion circuit 101 and the energy storage unit 103.

[0103] In the embodiment of the present application, the power conversion circuit 101 is a circuit for switching the energy storage module in the energy storage system. Specifically, the power conversion circuit 101 primarily implements two operating modes, namely, switching on and off the energy storage unit 103 during the charge and discharge states, through different pathways. The power conversion circuit 101 can be implemented as a half-bridge circuit composed of power semiconductor devices, a full-bridge circuit composed of power semiconductor devices, or a quasi-full-bridge circuit composed of power semiconductor devices, etc.

[0104] For example, the above Figure 1 The schematic power conversion circuit 101 is a half-bridge circuit composed of power semiconductor devices, wherein T1 and T2 are both power devices, which can be implemented by insulated gate bipolar transistors (IGBTs). Figure 4 The power conversion circuit 101 is a full-bridge circuit composed of power devices, wherein T1, T2, T3 and T4 can also be implemented by IGBTs. In addition, when the power device in the power conversion circuit 101 is an IGBT, since IGBT is a switch tube, the above Figure 1 and Figure 4 The gate of the IGBT is connected to a driving circuit, which is mainly used to drive the IGBT to be turned on and off. However, in order to clearly highlight the key points, the embodiment of the present application does not illustrate the driving circuit connected to the gate of the IGBT.

[0105] In actual operation, the energy storage unit 103 in the energy storage module is divided into an input mode and a cut-off mode in a charging state, and an input mode and a cut-off mode in a discharging state. Figure 1 Taking the above as an example, the working principles in the above input mode and cut-off mode are explained in combination with the circuit schematic diagram, as follows:

[0106] (1) Energy storage unit 103 is in charging state. In this mode, the T2 tube is turned off, and the D2 and T1 tubes are also not conducting due to the reverse voltage. Then the current in the main circuit of the energy storage system enters from the S1 port through D1 into the energy storage unit 103 and then flows out through the S2 port to form a loop, so that the energy storage unit 103 can be charged.

[0107] (2) Energy storage unit 103 is in the charging state of the cut-off mode: In this mode, the T2 tube is turned on. Since the voltage drop across the tube T2 is very low when it is turned on, the current in the main circuit of the energy storage system enters the S1 port and flows directly through T2 and then out of the S2 port to form a loop, cutting off the energy storage unit 103 from the main circuit and no longer charging. At this time, because there is voltage on the energy storage unit 103, D1 is clamped by the reverse voltage and is in the cut-off state.

[0108] (3) Energy storage unit 103 is in the discharging state in the input mode: In this mode, T2, D2 and D1 are not conducting, while T1 is conducting. Then the current in the main circuit of the energy storage system directly enters the energy storage unit 103 from the S2 port, passes through the T1 tube, and flows out from the S1 port to form a loop, so that the energy storage unit 103 is in the discharging state.

[0109] (4) Cut-off mode in which the energy storage unit 103 is in a discharging state: In this mode, the T2 tube, D2, and T1 are all non-conductive. The current in the main circuit of the energy storage system enters from the S2 port and flows directly out from the S1 port through D2 to form a loop, completely cutting off the energy storage unit 103 from the main circuit and no longer discharging.

[0110] In this embodiment of the present application, the support circuit 102 may include a support capacitor C. The support capacitor C refers to a capacitor located at the DC or AC end of the energy storage module, has a large capacitance, and is used to support the energy storage module voltage or suppress voltage fluctuations. The energy storage unit 103 is the device used to store electrical energy in the energy storage module. In the energy storage module, the power conversion circuit 101, the support circuit 102, and the energy storage unit 103 are arranged in parallel.

[0111] The impedance circuit 104 includes at least one impedance element, which is not limited to one or more of a resistive element, an inductive element, and a capacitive element. These impedance elements are arranged at different positions between the power conversion circuit 101 and the energy storage unit 103. Figure 3 In the area indicated by the dotted line box, the at least one impedance element can be distributed and set at any position within this area.

[0112] In the embodiment of the present application, the added impedance circuit 104 can enable the equivalent RLC resonant network in the energy storage module to reduce the current gain of the energy storage unit 103 during the operation of the energy storage valve submodule, thereby alleviating the impact of the oscillating current on the energy storage unit 103.

[0113] Specifically, in the above Figure 2 In the equivalent network shown, taking the equivalent stray inductance and equivalent internal resistance of the energy storage unit 103 and the bus as an example, the inherent oscillation frequency of the energy storage module can be expressed as ,in, represents the equivalent internal resistance of the energy storage unit 103 and the busbar, represents the equivalent stray inductance of the energy storage unit 103 and the busbar, Represents the support capacitance C in the support circuit, Represents a complex variable.

[0114] The current transfer function of the energy storage unit 103 can be expressed as: ,in, represents the current of the energy storage unit 103, represents the current of the power conversion circuit 101. Further, combined with the equivalent stray inductance of the energy storage unit 103 and the busbar, and the equivalent internal resistance of the energy storage unit 103 and the busbar in the equivalent network, the current transfer function can be equivalent to: .

[0115] In the embodiment of the present application, after the impedance circuit 104 is added to the topology of the energy storage module, the current transfer function of the energy storage unit 103 is: ,in, Represents the admittance of the impedance circuit 104. Figure 2 The equivalent network of the energy storage module before the impedance circuit 104 is added is shown in FIG. 1 . The current transfer function of the energy storage unit 103 is increased in the denominator. , the energy storage module with the impedance circuit 104 added can have a smaller current than the energy storage module without the impedance circuit 104, thereby reducing the current gain of the energy storage module and suppressing underdamped oscillation.

[0116] It is understood that the specific types of resistive elements, inductive elements, and capacitive elements included in the at least one impedance element in the impedance circuit 104 are not unique. In one embodiment, the resistive element includes a resistor, the inductive element includes an inductor, and the capacitive element includes a capacitor. More specifically, in one embodiment, the resistive element may include a resistor, or a resistor component formed by connecting two or more resistors in series and / or in parallel, without specific limitation. The inductive element may include an inductor, or an inductor component formed by connecting two or more inductors in series and / or in parallel, without specific limitation. The capacitive element may include a capacitor, or a capacitor component formed by connecting two or more capacitors in series and / or in parallel, without specific limitation.

[0117] Furthermore, in order to match the oscillation suppression degree or effect of the impedance circuit 104 with the suppression amplitude required by the energy storage module, it is also possible to configure corresponding device parameters for each component in the impedance circuit 104 in combination with relevant parameters in the energy storage module in actual application scenarios, such as the resonant frequency, damping ratio and gain coefficient of the energy storage module, to improve the accuracy of oscillation suppression.

[0118] In the topological structure of the energy storage module provided in the embodiment of the present application, an impedance circuit 104 composed of at least one impedance element is provided between the power conversion circuit 101 and the energy storage unit 103. When the energy storage module is in operation, the addition of the impedance circuit 104 can suppress underdamped oscillations between the power conversion circuit 101 and the energy storage unit 103, thereby mitigating situations in which the charging and discharging currents of the energy storage unit 103 exceed the rated operating current due to the oscillating current, reducing abnormal attenuation of the life of the energy storage unit 103, and thereby improving the operational reliability of the energy storage module.

[0119] As can be seen from the above embodiments, the addition of impedance circuit 104 results in a lower current gain for energy storage unit 103. Furthermore, when comparing the current transfer function before and after the addition of impedance circuit 104, the energy storage module's equivalent RLC resonant network is used as the basis for judgment. Based on this, in the circuit topology of the energy storage module provided in the embodiments of the present application, a resonant network is formed between different components. The introduction of this resonant network results in a lower current gain for the entire energy storage module, thereby suppressing underdamped oscillations in the energy storage module.

[0120] In practical applications, at least one impedance element in the impedance circuit 104 of the embodiment of the present application can realize an equivalent RLC resonant network in various ways. For example, a resonant network can be formed between the impedance elements in the impedance circuit, or between the impedance elements in the impedance circuit and the support capacitors in the support circuit 102, or between all other components except the power conversion circuit 101.

[0121] The following describes the implementation of the impedance circuit 104 in the above different situations through specific embodiments.

[0122] In one embodiment, the at least one impedance element in the impedance circuit 104 includes a plurality of impedance elements, and a resonant network is formed between the plurality of impedance elements.

[0123] In the embodiment of the present application, when the impedance circuit 104 has multiple impedance elements, a resonant network is formed between the multiple impedance elements, thereby reducing the current gain of the energy storage unit in the equivalent network of the entire energy storage module, thereby suppressing the under-damped oscillation of the energy storage module.

[0124] Specifically, the plurality of impedance elements may be arranged in two positions: a portion is arranged in the main circuit of the energy storage module and another portion is arranged in the branch circuit of the energy storage module, and all are arranged in the branch circuit of the energy storage module.

[0125] In the case where one part is in the main circuit of the energy storage module and the other part is in the branch circuit of the energy storage module, the multiple impedance elements include a first resistive element 1041, a first inductive element 1042 and a first capacitive element 1043. The first resistive element 1041 and the first inductive element 1042 are both arranged in the main circuit of the energy storage module, and the first capacitive element 1043 is arranged in the branch circuit of the energy storage module.

[0126] In the embodiment of the present application, the first resistive element 1041 can be a resistor, or a plurality of resistors can be connected in series or in parallel; the first inductive element 1042 can be an inductor, or a plurality of inductors can be connected in series or in parallel; similarly, the first capacitive element 1043 can be a capacitor, or a plurality of capacitors can be connected in series or in parallel.

[0127] The first resistive element 1041 and the first inductive element 1042 are both disposed on the main circuit of the energy storage module, and can be located at any position on the main circuit. The branch in which the first capacitive element 1043 is disposed can also be any branch. In the embodiment of the present application, the first resistive element 1041 and the first inductive element 1042 are disposed on the main circuit, and the first capacitive element 1043 is disposed on the branch, so that the first resistive element 1041 and the first inductive element 1042 are connected in series with the first capacitive element 1043, thereby forming a resonant network, reducing the current gain in the energy storage module, suppressing underdamped oscillations, and achieving high operational reliability.

[0128] The first resistive element 1041 and the first inductive element 1042 are both arranged on the main circuit of the energy storage module, and the first capacitive element 1043 is arranged at a specific position on the branch circuit of the energy storage module. Specific topological diagrams of examples in several scenarios are provided below.

[0129] like Figure 5 As shown, in one embodiment, the first resistive element 1041 is arranged on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, the first capacitive element 1043 is arranged on the parallel branch between the support circuit 102 and the energy storage unit 103, and the first inductive element 1042 is arranged on the main loop between the first end of the first capacitive element 1043 and the first end of the energy storage unit 103.

[0130] In this embodiment, combined with specific component examples, as shown below Figure 6 As shown, R1 is set on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, C1 is connected in parallel on the branch between the support circuit 102 and the energy storage unit 103, and L1 is set on the main loop between the first end of C and the first end of the energy storage unit 103.

[0131] By setting the first resistive element 1041 on the main circuit between the first end of the power conversion circuit 101 and the first end of the support circuit 102, the first capacitive element 1043 on the parallel branch between the support circuit 102 and the energy storage unit 103, and the first inductive element 1042 on the main circuit between the first end of the first capacitive element 1043 and the first end of the energy storage unit 103, the first resistive element 1041 and the first inductive element 1042 are connected in series with the first capacitive element 1043, thereby forming a resonant network, reducing the current gain in the energy storage module, achieving suppression of underdamped oscillations, and having high operational reliability.

[0132] like Figure 7 As shown, in one embodiment, the first inductive element 1042 is arranged on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, the first capacitive element 1043 is arranged on the branch in parallel between the support circuit 102 and the energy storage unit 103, and the first resistive element 1041 is arranged on the main loop between the first end of the first capacitive element 1043 and the first end of the energy storage unit 103.

[0133] In this embodiment, combined with specific component examples, such as Figure 8 As shown, L1 is set on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, C1 is also connected in parallel on the branch between the support circuit 102 and the energy storage unit 103, and R1 is set on the main loop between the first end of C and the first end of the energy storage unit 103.

[0134] compared to Figure 6In the topology shown, the positions of the first resistive element 1041 and the first inductive element 1042 are swapped, but the first resistive element 1041 and the first inductive element 1042 can still be connected in series with the first capacitive element 1043 to form a resonant network, thereby reducing the current gain in the energy storage module while increasing the flexibility of setting the impedance element in the energy storage module.

[0135] like Figure 9 As shown, in one embodiment, the first resistive element 1041 is arranged on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, and the first inductive element 1042 is arranged on the main loop between the second end of the power conversion circuit 101 and the second end of the support circuit 102; the first capacitive element 1043 is arranged on the branch in parallel between the support circuit 102 and the energy storage unit 103.

[0136] Combined with specific component examples, such as Figure 10 As shown, R1 is set on the main loop between the first end of the power conversion circuit 101 and the first end of the support circuit 102, L1 is set on the main loop between the second end of the power conversion circuit 101 and the second end of the support circuit 102, and C1 is still connected in parallel on the branch between the support circuit 102 and the energy storage unit 103.

[0137] In this embodiment, the first inductive element 1042 is positioned on the main circuit at the second end of the power conversion circuit 101. In this way, the first resistive element 1041, the first capacitive element 1043, and the first inductive element 1042 are connected in series to form a resonant network, thereby reducing the current gain in the energy storage module while increasing the flexibility of the arrangement of the impedance element in the energy storage module.

[0138] like Figure 11 As shown, in one embodiment, the first capacitive element 1043 is arranged on a branch connected in parallel between the support circuit 102 and the energy storage unit 103, the first resistive element 1041 and the first inductive element 1042 are connected in series, and the series-connected first resistive element 1041 and the first inductive element 1042 are arranged on a main loop between the first end of the first capacitive element 1043 and the first end of the energy storage unit 103.

[0139] Combined with specific component examples, such as Figure 12 As shown, C1 is still connected in parallel to the branch between the support circuit 102 and the energy storage unit 103 , and the first inductive element 1042 and the first resistive element 1041 are connected in series on the main loop between the first end of C1 and the first end of the energy storage unit 103 .

[0140] Of course, in practical applications, it can also be transformed into L1 and R1 being arranged in series on the main circuit between the second end of the first capacitive element 1043 and the second end of the energy storage unit 103; or, L1 and R1 being arranged in series on the main circuit between the first end of the power conversion circuit 101 and the first end of the support circuit 102; or, L1 and R1 being arranged in series on the main circuit between the second end of the power conversion circuit 101 and the second end of the support circuit 102, and so on.

[0141] In this embodiment, the first inductive element 1042 and the first resistive element 1041 are connected in series and arranged in the main loop between the first end of the first capacitive element 1043 and the first end of the energy storage unit 103, so that the first resistive element 1041, the first capacitive element 1043 and the first inductive element 1042 are connected in series to form a resonant network, which reduces the current gain in the energy storage module while increasing the flexibility of the arrangement of the impedance element in the energy storage module.

[0142] The above four circuit topologies are merely examples of several implementations in which some of the multiple impedance elements are located in the main circuit of the energy storage module and some are located in the branch circuits. In practical applications, other topologies obtained by simple deformation based on these topologies are not limited.

[0143] In the case where all of the multiple impedance elements are located on the branch circuit of the energy storage module, in one embodiment, the first resistive element 1041, the first inductive element 1042, and the first capacitive element 1043 are all located on the branch circuit of the energy storage module. In this embodiment, all of the first resistive element 1041, the first inductive element 1042, and the first capacitive element 1043 are located on the branch circuit, which effectively reduces circuit volume and cost, and also facilitates replacement of the impedance elements in the impedance circuit 104.

[0144] like Figure 13 As shown, in one embodiment, the first resistive element 1041 , the first inductive element 1042 and the first capacitive element 1043 are connected in series and then connected in parallel as a branch between the support circuit 102 and the energy storage unit 103 .

[0145] Combined with specific component examples, Figure 14 In the embodiment, R1, L1 and C1 are connected in series to form a branch circuit, which is connected in parallel between the support circuit 102 and the energy storage unit 103.

[0146] In actual applications, R1, L1 and C1 are connected in series to form a branch, which can also be connected in parallel behind the energy storage unit 30, that is, the parallel order is the power conversion circuit 101, the support circuit 102, the energy storage unit 103 and the series branch of R1, L1 and C1; or, R1, L1 and C1 are connected in series to form a branch, which can also be connected in parallel between the power conversion circuit 101 and the support circuit 102, that is, the parallel order is the power conversion circuit 101, the series branch of R1, L1 and C1, the support circuit 102 and the energy storage unit 103.

[0147] In this embodiment, the first resistive element 1041, the first inductive element 1042, and the first capacitive element 1043 are connected in series and connected in parallel as a branch between the support circuit 102 and the energy storage unit 103, that is, the series resistance, inductance, and capacitance damping resonance is achieved, which can not only suppress under-damped oscillations, but also effectively reduce the circuit volume and reduce the circuit cost.

[0148] In the various impedance circuit implementations listed above, the inductive elements, resistive elements, and capacitive elements are all connected in series. However, as long as the impedance circuit formed by the inductive elements, resistive elements, and capacitive elements in the energy storage module can reduce the current gain of the entire energy storage module and suppress the under-damped oscillation of the energy storage module, it can be sufficient. For example, in some scenarios, R1 and L1 are connected in parallel and then in series with C1 as a branch connected to the energy storage module; or, R1 and L1 are both connected in parallel with C1 as a branch connected to the energy storage module; or, R1 and C1 are connected in series as a branch and then in parallel with L1, and L1 and C1 are connected in series as a branch and then in parallel with R1, etc. The embodiments of the present application are not limited to this.

[0149] In addition, in one embodiment, the at least one impedance element includes a plurality of impedance elements, the supporting circuit 102 includes a supporting capacitor C, and the plurality of impedance elements and the supporting capacitor C form a resonant network.

[0150] In this embodiment, when the impedance circuit 104 has multiple impedance elements, the multiple impedance elements can also form a resonant network with the support capacitor in the support circuit 102, thereby reducing the current gain of the energy storage unit in the equivalent network of the entire energy storage module and suppressing the under-damped oscillation of the energy storage module.

[0151] In one embodiment, the plurality of impedance elements include a second resistive element 1045 and a second inductive element 1046 , and the second resistive element 1045 and the second inductive element 1046 are both disposed on the main circuit of the energy storage module.

[0152] In this case, the multiple impedance elements only include the second resistive element 1045 and the second inductive element 1046. The second resistive element 1045 and the second inductive element 1046 can all be located on the main circuit of the energy storage module, so that the second resistive element 1045 and the second inductive element 1046, combined with the support capacitor C, form a resonant network, thereby reducing the current gain of the energy storage unit in the equivalent network of the entire energy storage module and suppressing underdamped oscillations of the energy storage module. Furthermore, because no additional capacitive elements are required, the cost and volume of the energy storage module can be effectively reduced.

[0153] Among them, like the aforementioned first resistive element 1041, the second resistive element 1045 can also be a resistor, or multiple resistors can be connected in series or in parallel; like the aforementioned first inductive element 1042, the second inductive element 1046 can be an inductor, or multiple inductors can be connected in series or in parallel. It is also understandable that the first, second, third, etc., used to distinguish between resistive elements, inductive elements, and capacitive elements in the embodiments of the present application do not limit these elements, but are merely distinguished for the convenience of clear illustration in different embodiments. In actual applications, these elements can be of the same model and parameters, or of different models and parameters, etc.

[0154] The following describes different positions of the second resistive element 1045 and the second inductive element 1046 on the main circuit with examples.

[0155] like Figure 15 As shown, in one embodiment, the second resistive element 1045 is arranged on the main loop between the first end of the power conversion circuit 101 and the first end of the support capacitor, and the second inductive element 1046 is arranged on the main loop between the second end of the power conversion circuit 101 and the second end of the support capacitor.

[0156] Combined with specific components, Figure 16 In the embodiment, R2 is provided in the main loop between the first end of the power conversion circuit 101 and the first end of the support capacitor C, and L2 is provided in the main loop between the second end of the power conversion circuit 101 and the second end of the support capacitor C. In this embodiment, only the second resistive element 1045 and the second inductive element 1046 are added to the main loops on both sides of the power conversion circuit 101 and the support capacitor C, respectively. This forms a resonant network, which reduces the current gain of the energy storage module while effectively reducing the cost and volume of the energy storage module.

[0157] like Figure 17As shown, in one embodiment, the second resistive element 1045 is arranged on the main loop between the first end of the supporting capacitor and the first end of the energy storage unit 103, and the second inductive element 1046 is arranged on the main loop between the second end of the supporting capacitor and the second end of the energy storage unit 103.

[0158] Combined with specific components, Figure 18 In the embodiment, R2 is on the main loop between the first end of the support capacitor C and the first end of the energy storage unit 103, and L2 is set on the main loop between the second end of the support capacitor C and the second end of the energy storage unit 103. Figure 16 In the embodiment, R2 and L2 are replaced to the main loop between the supporting capacitor C and the energy storage unit 103, so that the position setting of the second resistive element 1045 and the second inductive element 1046 is more flexible.

[0159] like Figure 19 As shown, in one embodiment, the second resistive element 1045 and the second inductive element 1046 are connected in series, and the series-connected second resistive element 1045 and the second inductive element 1046 are arranged on the main loop between the first end of the support capacitor and the first end of the energy storage unit 103 .

[0160] Combined with specific components, Figure 20 In the figure, L2 and R2 are connected in series on the main loop between the first end of the support capacitor C and the first end of the energy storage unit 103, forming a series connection with the support capacitor C to form a resonant circuit, thereby reducing the current gain of the energy storage module and suppressing the underdamped oscillation of the energy storage module.

[0161] In the impedance circuit implementation methods listed above that only include resistive elements and inductive elements, the inductive elements, resistive elements and capacitive elements are all set on the main circuit, but similarly, as long as the impedance circuit formed between the inductive elements, resistive elements and capacitive elements in the energy storage module can reduce the current gain of the entire energy storage module and suppress the under-damped oscillation of the energy storage module, for example, in some scenarios, R2 and L2 are connected in parallel and then in series with the support capacitor C as a branch connected to the energy storage module; or, R2 and L2 are both connected in parallel with the support capacitor C as a branch connected to the energy storage module; or, R2 is connected in series with the support capacitor C as a branch and then in parallel with L2, and L2 is connected in series with the support capacitor C as a branch and then in parallel with R2, etc., the embodiments of the present application are not limited to this.

[0162] In the embodiment of the present application, there is also a case where the at least one impedance element in the impedance circuit 104 includes only one impedance element. This case is described below in conjunction with the embodiment.

[0163] In one embodiment, the at least one impedance element includes an impedance element, and the impedance element forms a resonant network with a target portion of the energy storage module, where the target portion refers to a portion of the energy storage module excluding the power conversion circuit 101 .

[0164] An impedance element can be any of an inductive element, a resistive element, or a capacitive element. When only one impedance element is included in the impedance circuit 104 added to the energy storage module, a resonant network is formed between the impedance element and the target portion of the energy storage module. The target portion may, for example, include the support capacitor C, the energy storage unit 103 (including its equivalent internal resistance and equivalent stray inductance), the equivalent internal resistance and equivalent stray inductance of the bus, the wires in the energy storage module, and so on, that is, all components of the energy storage module except the power conversion circuit 101.

[0165] In this embodiment, only one impedance element is provided in the impedance circuit 104. This impedance element forms a resonant network with all parts of the energy storage module except the power conversion circuit 101, thereby reducing the current gain in the energy storage module, thereby suppressing underdamped oscillations of the energy storage module and improving the operational reliability of the energy storage module.

[0166] The following is an example of the location of the impedance element in the energy storage module when only one impedance element is provided in the impedance circuit 104 .

[0167] like Figure 21 As shown, in one embodiment, an impedance element includes a third inductive element 1047 , and the third inductive element 1047 is disposed between the first end of the supporting circuit 102 and the first end of the energy storage unit 103 .

[0168] In this embodiment, an impedance element only includes the third inductive element 1047, wherein the third inductive element 1047, like the other inductive elements mentioned above, can be an inductor, or multiple inductors can be connected in parallel or in series. Figure 22 As shown in the specific component schematic, L3 is connected to the main circuit between the first end of the support capacitor C and the first end of the energy storage unit 103. Thus, by simply adding a third inductive element 1047 to the main circuit between the first end of the support circuit 102 and the first end of the energy storage unit 103, a resonant network is formed between the third inductive element 1047 and the portion of the energy storage module other than the power conversion circuit 101. This results in a lower current gain in the energy storage module, thereby suppressing underdamped oscillations in the energy storage module and improving its operational reliability. Furthermore, the addition of only one third inductive element 1047 significantly reduces costs and reduces the size of the energy storage module.

[0169] like Figure 23As shown, in one embodiment, an impedance element includes a third resistive element 1048 , and the third resistive element 1048 is disposed between the first end of the support circuit 102 and the first end of the energy storage unit 103 .

[0170] In this embodiment, an impedance element only includes the third resistive element 1048, wherein the third resistive element 1048 can also be a resistor, or multiple resistors can be connected in parallel or in series. Figure 24 As shown in the specific component schematic, R3 is connected to the main circuit between the first end of the support capacitor C and the first end of the energy storage unit 103. Thus, by simply adding a third resistive element 1048 to the main circuit between the first end of the support circuit 102 and the first end of the energy storage unit 103, a resonant network is formed between the third resistive element 1048 and the portion of the energy storage module other than the power conversion circuit 101. This results in a lower current gain in the energy storage module, thereby suppressing underdamped oscillations in the energy storage module and improving its operational reliability. Furthermore, the addition of only one third resistive element 1048 significantly reduces costs and reduces the size of the energy storage module.

[0171] like Figure 25 As shown, in one embodiment, an impedance element includes a second capacitive element 1049, which is disposed in a branch connected in parallel between the support circuit 102 and the energy storage unit 103. In one embodiment, a fourth resistive element 10410 is further connected in series to the branch where the second capacitive element 1049 is located.

[0172] In this embodiment, an impedance element only includes the second capacitive element 1049, wherein the second capacitive element 1049 can also be a capacitor, or multiple capacitors can be connected in parallel or in series. Figure 26 As shown in the specific component diagram, C2 is provided in the parallel branch between the support circuit 102 and the energy storage unit 103. This forms a resonant network between C2 and the portion of the energy storage module other than the power conversion circuit 101. This reduces the current gain in the energy storage module, suppresses underdamped oscillations in the energy storage module, and thus improves the operational reliability of the energy storage module. Similarly, only one second capacitive element 1049 is added, significantly saving costs and the volume of the energy storage module.

[0173] In some scenarios, in order to enhance the effect of suppressing under-damped oscillation, a fourth resistive element 10410 may be connected in series to the branch where the second capacitive element 1049 is located, such as Figure 27 As shown, an R4 is connected in series with the branch where C2 is located. This enhances the amplitude of the resonant network reducing the current gain of the energy storage module, thereby greatly suppressing the underdamped oscillation of the energy storage module and improving the operational reliability of the energy storage module.

[0174] Of course, a resistive element can also be connected in series with the branch where the supporting capacitor C is located in the energy storage module. At the same time, a branch can be connected in parallel with the supporting capacitor C, and a capacitive element and a resistive element can be connected in series on the branch. Alternatively, a capacitive element and an inductive element can be connected in series on the branch. Alternatively, a resistive element, an inductive element, and a capacitive element can be connected in series on the branch. Another branch can even be connected in parallel next to the branch, and so on. In practical applications, taking into account various factors such as economic cost, energy storage module volume, and the effect of suppressing underdamped oscillation, the specific configuration of the various impedance elements included in the impedance circuit 104 added to the energy storage module in the embodiment of the present application is not limited, and can be obtained by multiple expansions and simple modifications based on the same concept.

[0175] In one embodiment, the present application further provides an energy storage system, which includes the energy storage module listed in any of the aforementioned embodiments.

[0176] The energy storage system can be a high-voltage direct-mounted energy storage system, a non-high-voltage direct-mounted energy storage system, a high-voltage non-direct-mounted energy storage system, or the like. The energy storage system can include one or more energy storage modules, and each energy storage module can be implemented using the same or different embodiments described above. The energy storage system provided by the embodiments of the present application, because it includes the energy storage modules provided by the embodiments of the present application, greatly increases the operational reliability of the energy storage system.

[0177] In one embodiment, the present application further provides a power system, which includes any one of the energy storage systems provided in the above embodiments.

[0178] There can be one or more energy storage systems in the power system, and the operational reliability of each energy storage system greatly guarantees the operational reliability of the power system.

[0179] The above content is a further detailed description of the embodiments of the present application in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the embodiments of the present application is limited to these descriptions. For ordinary technicians in the technical field of the embodiments of the present application, without departing from the concept of the embodiments of the present application, they can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be considered to belong to the scope of protection of the embodiments of the present application. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner. The various technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the various technical features in the above 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.

[0180] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An energy storage module, characterized in that: The energy storage module includes a power conversion circuit, a support circuit, an energy storage unit and an impedance circuit; the power conversion circuit, the support circuit and the energy storage unit are arranged in parallel; the impedance circuit includes at least one impedance element, the at least one impedance element is arranged between the power conversion circuit and the energy storage unit, and at least one of the at least one impedance element is distributed on the main circuit of the energy storage module.

2. The energy storage module according to claim 1, characterized in that The at least one impedance element includes a plurality of impedance elements, and a resonant network is formed between the plurality of impedance elements.

3. The energy storage module according to claim 2, characterized in that: The multiple impedance elements include a first resistive element, a first inductive element and a first capacitive element. The first resistive element and the first inductive element are both arranged on the main circuit of the energy storage module, and the first capacitive element is arranged on the branch circuit of the energy storage module.

4. The energy storage module according to claim 3, characterized in that: The first resistive element is arranged on the main circuit between the first end of the power conversion circuit and the first end of the support circuit, the first capacitive element is arranged on the branch in parallel between the support circuit and the energy storage unit, and the first inductive element is arranged on the main circuit between the first end of the first capacitive element and the first end of the energy storage unit.

5. The energy storage module according to claim 3, characterized in that: The first inductive element is arranged on the main circuit between the first end of the power conversion circuit and the first end of the support circuit, the first capacitive element is arranged on the branch in parallel between the support circuit and the energy storage unit, and the first resistive element is arranged on the main circuit between the first end of the first capacitive element and the first end of the energy storage unit.

6. The energy storage module according to claim 3, characterized in that: The first resistive element is arranged on the main loop between the first end of the power conversion circuit and the first end of the support circuit, and the first inductive element is arranged on the main loop between the second end of the power conversion circuit and the second end of the support circuit; the first capacitive element is arranged on the branch in parallel between the support circuit and the energy storage unit.

7. The energy storage module according to claim 3, characterized in that: The first capacitive element is arranged in a branch connected in parallel between the support circuit and the energy storage unit, the first resistive element and the first inductive element are connected in series, and the first resistive element and the first inductive element after the series connection are arranged in a main loop between the first end of the first capacitive element and the first end of the energy storage unit.

8. The energy storage module according to claim 1, characterized in that: The at least one impedance element includes a plurality of impedance elements, the support circuit includes a support capacitor, and the plurality of impedance elements and the support capacitor form a resonant network.

9. The energy storage module according to claim 8, characterized in that: The plurality of impedance elements include a second resistive element and a second inductive element, and the second resistive element and the second inductive element are both arranged on the main circuit of the energy storage module.

10. The energy storage module according to claim 9, characterized in that: The second resistive element is arranged on the main loop between the first end of the power conversion circuit and the first end of the support capacitor, and the second inductive element is arranged on the main loop between the second end of the power conversion circuit and the second end of the support capacitor.

11. The energy storage module according to claim 9, characterized in that: The second resistive element is arranged on the main loop between the first end of the support capacitor and the first end of the energy storage unit, and the second inductive element is arranged on the main loop between the second end of the support capacitor and the second end of the energy storage unit.

12. The energy storage module according to claim 9, characterized in that: The second resistive element and the second inductive element are connected in series, and the second resistive element and the second inductive element connected in series are arranged in a main loop between the first end of the support capacitor and the first end of the energy storage unit.

13. The energy storage module according to claim 1, characterized in that: The at least one impedance element includes one impedance element, and the one impedance element forms a resonant network with a target portion in the energy storage module, where the target portion represents a portion of the energy storage module excluding the power conversion circuit.

14. The energy storage module according to claim 13, characterized in that: The one impedance element includes a third inductive element, and the third inductive element is arranged between the first end of the support circuit and the first end of the energy storage unit.

15. The energy storage module according to claim 13, characterized in that: The one impedance element includes a third resistive element, and the third resistive element is arranged between the first end of the support circuit and the first end of the energy storage unit.

16. An energy storage system, characterized in that: The energy storage system comprises the energy storage module according to any one of claims 1 to 15.

17. A power system, characterized in that: The power system includes the energy storage system according to claim 16.

Images