Energy storage device, power supply system, and electronic device

Abstract

The invention relates to the technical field of high-voltage energy storage, and discloses an energy storage device, a power supply system and electronic equipment, a power module of the energy storage device is connected with an electric cabinet through a connecting conductor, and based on the principle that the same-direction current of the adjacent connecting conductors increases the induced magnetic field intensity and the opposite-direction current weakens the induced magnetic field intensity, the power module is connected with the electric cabinet. The adjacent connecting conductors are designed to be current in different directions, so that the induced magnetic field intensity is weakened, the eddy-current loss is reduced, the temperature of the device is reduced, and heat dissipation is facilitated.

Description

Technical Field

[0001] The present application relates to the field of high-voltage energy storage technology, and in particular to an energy storage device, a power supply system, and an electronic device. Background Art

[0002] As the installed capacity of energy storage power stations increases, multiple cabinets are connected in parallel, which has become the current situation. From the perspective of voltage level, it is currently divided into low-voltage PCS (Power Conversion System, energy storage converter) energy storage and high-voltage cascade direct-mounted energy storage. Multiple cabinets are connected in parallel as a storage sub-unit. Low-voltage energy storage is mostly packaged in containers; while high-voltage energy storage is easier to implement with a frame structure due to insulation design, strength design and other requirements. It is safe, reliable and economical. Summary of the invention

[0003] In view of the above problems, the present application provides an energy storage device, a power supply system and an electronic device, which can solve the problem that eddy current losses are generated in the current high-voltage energy storage system due to switching, resulting in temperature rise and poor heat dissipation during long-term operation.

[0004] In a first aspect, an embodiment of the present application provides an energy storage device, the energy storage device comprising:

[0005] At least one electrical cabinet, wherein a battery module is disposed in the electrical cabinet;

[0006] At least one power module, each of which is connected to at least one of the electric cabinets and is used to control the input and output of the electric cabinet;

[0007] at least one frame, used to fix the electric cabinet, and the electric cabinet is located inside the frame; and

[0008] At least two connecting conductors, the connecting conductors are used to connect the power module and the electrical cabinet;

[0009] The currents in the two adjacent and side-by-side connecting conductors are in opposite directions.

[0010] In the technical solution of the embodiment of the present application, the power module of the energy storage device is connected to the electric cabinet through a connecting conductor. Based on the principle that the same-direction current of adjacent connecting conductors increases the induced magnetic field strength, while the opposite-direction current weakens the induced magnetic field strength, the adjacent connecting conductors are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength and reducing the eddy current loss, thereby reducing the device temperature and facilitating heat dissipation.

[0011] In some embodiments, the two connecting conductors include:

[0012] A first connecting conductor, connecting the positive electrode of the power module with the positive electrode of the electric cabinet; and

[0013] The second connecting conductor connects the negative electrode of the power module and the negative electrode of the electric cabinet.

[0014] In the technical solution of the embodiment of the present application, the positive busbar connecting the power module and the electrical cabinet is the first connecting conductor, and the negative busbar is the second connecting conductor. All the first connecting conductors and the second connecting conductors are set to have currents in opposite directions, which is beneficial to reducing the overall induced magnetic field strength of the energy storage device, reducing the eddy current loss of the entire device, thereby reducing the equipment temperature and facilitating heat dissipation.

[0015] In some embodiments, two adjacent and side-by-side connecting conductors are connected to one power module and at least one electrical cabinet.

[0016] In the technical solution of the embodiment of the present application, based on the general arrangement that the connecting conductors connecting one power module and at least one electrical cabinet are closer than the connecting conductors connecting other power modules, all the first connecting conductors and the second connecting conductors are set to have currents in opposite directions, which is beneficial to reducing the overall induced magnetic field strength of the energy storage device, reducing the eddy current loss of the entire device, thereby reducing the equipment temperature and facilitating heat dissipation.

[0017] In some embodiments, two adjacent and side-by-side connecting conductors are arranged parallel to each other.

[0018] In the technical solution of the embodiment of the present application, two adjacent and side-by-side connecting conductors are arranged parallel to each other, which is further beneficial to reduce the overall induced magnetic field strength of the energy storage device, so that the eddy current loss of the entire device is reduced, thereby reducing the device temperature and facilitating heat dissipation.

[0019] In some embodiments, the connecting conductor is fixed to the frame in an electrically isolated manner and is located on the outside or inside of the frame.

[0020] The technical solution of the embodiment of the present application is convenient for assembly and maintenance, and is beneficial to the heat dissipation of the energy storage device.

[0021] In some embodiments, the connecting conductor comprises a metal bus or a cable.

[0022] In the technical solution of the embodiment of the present application, two embodiments of connecting conductors are provided, wherein the metal busbar is generally a copper busbar.

[0023] In some embodiments, a control module is also included, which is connected to the power module. The control module is used to output a preset drive signal. The power module controls the switching on and off of the electrical cabinet under the control of the preset drive signal, and the execution frequency is below 100 Hz.

[0024] In the technical solution of the embodiment of the present application, by controlling the frequency of switching on and off of the electrical cabinet, the current fluctuation during connection conduction is reduced, so that the current waveform becomes smooth, thereby reducing the induced magnetic field strength and reducing the eddy current loss of the entire device, thereby reducing the equipment temperature and facilitating heat dissipation.

[0025] In some embodiments, the slope of the execution frequency is below 2000 amperes / milliseconds. In the technical solution of the embodiment of the present application, by controlling the slope of the frequency of the input and output of the electric cabinet, the current fluctuation during the connection is reduced, so that the waveform of the current becomes smooth, thereby reducing the intensity of the induced magnetic field, reducing the eddy current loss of the entire device, thereby reducing the temperature of the device and facilitating heat dissipation.

[0026] In some embodiments, the power module includes a first switch element and an energy storage element connected in parallel to the first switch element, and the energy storage element is connected in parallel to the energy storage module.

[0027] In the technical solution of the embodiment of the present application, when the power module is connected to the energy storage module, the energy storage element can be charged first, thereby reducing the impact of large current on the first switching element and improving the reliability of the energy storage device.

[0028] In the technical solution of the embodiment of the present application, the power module includes a half-bridge circuit or a full-bridge circuit.

[0029] By adopting the above solution, flexible configuration of the power module is achieved, and the flexibility of the design of the energy storage device is improved.

[0030] In a second aspect, an embodiment of the present application further provides a power supply system, comprising the energy storage device as described above.

[0031] In the technical solution of the embodiment of the present application, the power module of the power supply system is connected to the electric cabinet through connecting conductors. Based on the principle that the same-direction current in adjacent connecting conductors increases the induced magnetic field strength, while the opposite-direction current weakens the induced magnetic field strength, the adjacent connecting conductors are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength and reducing the eddy current loss, thereby reducing the system temperature and facilitating heat dissipation.

[0032] In a third aspect, an embodiment of the present application further provides an electronic device, comprising the energy storage device as described above.

[0033] In the technical solution of the embodiment of the present application, the power module of the electronic device and the electrical cabinet are connected through connecting conductors. Based on the principle that the same-direction currents in adjacent connecting conductors increase the induced magnetic field strength, while the opposite-direction currents weaken the induced magnetic field strength, the adjacent connecting conductors are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength and reducing the eddy current loss, thereby reducing the system temperature and facilitating heat dissipation.

[0034] 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

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred 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:

[0036] Figure 1 A schematic diagram of the first structure of the energy storage device provided in the embodiment of the present application;

[0037] Figure 2 A first circuit diagram of an energy storage device provided in an embodiment of the present application;

[0038] Figure 3 A second circuit diagram of the energy storage device provided in an embodiment of the present application;

[0039] Figure 4 A third circuit diagram of the energy storage device provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of a high-steepness slope unidirectional current waveform of an energy storage device provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of transient loss corresponding to a same-direction current with a high steepness slope of an energy storage device provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of a unidirectional current waveform with a low steepness slope of an energy storage device provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of transient loss corresponding to a same-direction current with a low steepness slope of an energy storage device provided in an embodiment of the present application;

[0044] Fig. 9 A schematic diagram of transient loss corresponding to anisotropic current of a high-steepness slope current of an energy storage device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application are 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.

[0046] 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.

[0047] 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.

[0048] 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 at 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.

[0049] 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.

[0050] In the description of the embodiments of the present application, the term "multi-frame" refers to more than two (including two).

[0051] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0052] In the field of power system energy storage technology, the new high-voltage direct-hung energy storage technology integrates the VSC (Voltage Source Converter) converter valve with the DC energy storage valve, which has the advantages of high modularity, low system network loss, good economic benefits, and high operational reliability. By integrating the DC energy storage valve on the DC side of the VSC converter valve, AC / DC power conversion and energy storage are achieved at the same time. The new AC direct-hung energy storage technology is also ready to go. It adopts a cascaded H-bridge topology and is connected to the three-phase power grid by connecting the reactor to achieve AC / DC power conversion and energy storage. Compared with traditional energy storage technology, the two direct-hung energy storage systems have higher voltage levels, larger capacities, stronger grid regulation capabilities and grid support functions, and have important research significance for new power systems with new energy as the main body.

[0053] At present, the demand for energy storage in the power system is rapidly expanding, and the forms of energy storage are also diverse. As the capacity continues to increase, the high-voltage cascade method is increasingly used, and the architecture is mostly a series-parallel connection of multiple cabinets. Due to the increase in voltage level and the heavy weight of electrochemical energy storage, the traditional container structure cannot meet the requirements. The frame design is a new design idea. Among them, the frame is made of metal material, the physical layout of multiple cabinets is compact, and the DC output line of the cabinet is actually not a DC current. Because the battery side is not a constant DC current due to system switching, the temperature rise of the frame also needs attention and design.

[0054] In order to solve the problem that due to the transient switching of the system, the parallel connection of multiple cabinets and the output line or cable will cause eddy current loss in the frame, thereby increasing the frame temperature and being unfavorable for heat dissipation during long-term operation. Figure 1 An embodiment of the present application provides an energy storage device, which includes: at least one electrical cabinet 110, at least one power module 120, at least one frame 130 and at least two connecting conductors 140.

[0055] A battery module is arranged in the electric cabinet 110; each power module 120 is connected to at least one electric cabinet 110 for controlling the input and output of the electric cabinet 110; a frame 130 is used to fix the electric cabinet 110, and the electric cabinet 110 is located inside the frame 130; a connecting conductor 140 is used to connect the power module 120 and the electric cabinet 110; wherein the currents in two adjacent and side-by-side connecting conductors 140 are in opposite directions.

[0056] In addition to the battery modules, the electrical cabinet 110 is usually also provided with a battery management system (BMS) for battery module charge and discharge control, battery parameter monitoring and protection. The frame 130 is generally constructed of metal, which is conducive to the heat dissipation and fixation of the energy storage device, and the frame 130 is separated to accommodate the electrical cabinet 110 and other components. The power module 120 can be fixed in the frame 130 or placed outside the frame 130. The electrical cabinet 110 is generally put into operation by turning on the power module 120 so that the battery module can be charged and discharged. Please refer to Figure 2 ; The removal of the electric cabinet 110 is to shut down the power module 120, and the battery module is bypassed, please refer to Figure 3 When each power module 120 is connected to a plurality of electric cabinets 110, the plurality of electric cabinets 110 may be connected in parallel or in series. Two adjacent and side-by-side connecting conductors 140 refer to two connecting conductors 140 extending and laid side by side in the same direction.

[0057] In the embodiment of the present application, based on the principle that the same-direction currents in adjacent connecting conductors 140 increase the induced magnetic field strength, while the opposite-direction currents weaken the induced magnetic field strength, the adjacent connecting conductors 140 are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength and reducing eddy current losses, thereby reducing the device temperature and facilitating heat dissipation.

[0058] See also Figures 1 to 3 In some embodiments, the two connection conductors 140 include: a first connection conductor 141 and a second connection conductor 142. The first connection conductor 141 connects the positive electrode of the power module 120 with the positive electrode of the electric cabinet 110, that is, the positive busbar; the second connection conductor 142 connects the negative electrode of the power module 120 with the negative electrode of the electric cabinet 110, that is, the negative busbar.

[0059] Conventionally, a power module 120 is connected to at least one electric cabinet 110 via a first connecting conductor 141 and a second connecting conductor 142 (hereinafter referred to as a group of connecting conductors 140), and multiple electric cabinets 110 connected to the same power module 120 can be connected in series or in parallel. It is understandable that this group of connecting conductors 140 is generally arranged adjacently and side by side. When each group of connecting conductors 140 is arranged in this way, and the current direction is set to be in opposite directions, it is beneficial to reduce the overall induced magnetic field strength of the energy storage device, so that the eddy current loss of the entire device becomes smaller, thereby reducing the temperature of the equipment and facilitating heat dissipation.

[0060] In some embodiments, two adjacent and side-by-side connecting conductors 140 are connected to a power module 120 and at least one electric cabinet 110, and multiple electric cabinets 110 can be connected in parallel or in series, depending on the specific power requirements. Based on the general arrangement that the second connecting conductor 142 between the first connecting conductor 141 connecting the same power module 120 and the electric cabinet 110 is closer than the connecting conductor 140 connecting other power modules 120, each group of connecting conductors 140 is set to have current anisotropy, which is beneficial to reducing the overall induced magnetic field strength of the energy storage device, making the eddy current loss of the entire device smaller, thereby reducing the device temperature and facilitating heat dissipation.

[0061] In some embodiments, two adjacent and side-by-side connecting conductors 140, that is, the above-mentioned group of connecting conductors 140, are arranged parallel to each other. The two adjacent and side-by-side connecting conductors 140 are arranged parallel to each other, which is further conducive to reducing the overall induced magnetic field strength of the energy storage device, so that the eddy current loss of the entire device becomes smaller, thereby reducing the device temperature and facilitating heat dissipation.

[0062] In some embodiments, the connecting conductor 140 is fixed to the frame 130 in an electrically isolated manner and is located on the outside or inside of the frame 130. This facilitates assembly and maintenance and is beneficial to heat dissipation of the energy storage device.

[0063] The connecting conductor 140 includes a metal bar or a cable, wherein the metal bar is generally a copper bar, and an aluminum bar may also be used if the transmission power requirement is not high.

[0064] See also Figure 4 In some embodiments, the energy storage device also includes a control module 150, which is connected to the power module 120. The control module 150 is used to output a preset drive signal. The power module 120 controls the input and output of the electric cabinet 110 under the control of the preset drive signal. The execution frequency is below 100 Hz and the frequency slope is below 2000 A / millisecond.

[0065] The energy storage device is, for example, an energy storage valve, or an energy storage valve submodule that is part of the energy storage valve. The energy storage valve submodule generally includes a power module 120 and at least one electrical cabinet 110. Among them, the control module 150 includes a submodule controller (SubModuleController, SMC), which is used to monitor the working status of the energy storage valve submodule, receive the energy storage valve submodule control information issued by the valve base control device (Valve Base Controller, VBC) of the energy storage valve, and transmit the status of the submodule to VBC. At the same time, when the SMC detects that the energy storage valve submodule has a fault, the SMC bypasses the faulty submodule and transmits the fault information to VBC, which can ensure that other energy storage valve submodules continue to operate normally.

[0066] In the technical solution of the embodiment of the present application, the frequency of switching on and off of the electric cabinet 110 is controlled by controlling the switching frequency of the switching element in the power module 120 to control the frequency of switching on and off of the electric cabinet 110. The steepness adjustment of the frequency slope can extend the switching cycle of the switching element, thereby reducing the current fluctuation during the connection conduction, making the current waveform smoother, thereby reducing the induced magnetic field strength, reducing the eddy current loss of the entire device, thereby reducing the device temperature and facilitating heat dissipation.

[0067] In some embodiments, the power module 120 includes a first switch element and an energy storage element C1 connected in parallel to the first switch element, and the energy storage element C1 is connected in parallel to the electrical cabinet 110 .

[0068] There may be a plurality of first switch elements, which are connected in series and / or in parallel, and the energy storage element C1 is connected in parallel with the plurality of first switch elements connected in series and / or in parallel. In a specific implementation, the plurality of first switch elements connected in series and / or in parallel include a full-bridge circuit or a half-bridge circuit. When the electric cabinet 110 is put into operation, the energy storage element C1 may be charged first, thereby reducing the impact of the large current on the first switch element and improving the reliability of the energy storage device.

[0069] In some embodiments, the power module 120 includes a half-bridge circuit or a full-bridge circuit. It should be noted that the half-bridge circuit is a power circuit including two switch tubes, and the full-bridge circuit is a power circuit including four switch tubes. The half-bridge circuit has low cost and simple circuit; the full-bridge circuit has high cost and relatively complex circuit. However, the full-bridge circuit has less interference than the half-bridge circuit and has higher reliability. Flexible configuration of the power module 120 is achieved, and the flexibility of the design of the energy storage device is improved.

[0070] In some embodiments, the relative magnetic permeability of the material used to build the frame 130 is below 2000. If the frame 130 is made of iron, different iron materials have the same electrical conductivity but different magnetic permeabilities. If low magnetic permeability materials are used, the magnetic induction can be greatly reduced. If the relative magnetic permeability of stainless steel is 1 and the relative magnetic permeability of Q345 is about 500, the eddy current loss of the stainless steel is greatly reduced.

[0071] For details, please refer to Figure 5-Figure 9 ,in Figure 5 and Figure 7 In the waveform, the horizontal axis is time in milliseconds, and the vertical axis is current in amperes. Figure 6 , Figure 8 and Fig. 9 In the waveform, the horizontal axis is time in milliseconds, and the vertical axis is power in watts.

[0072] At the same switching frequency, two adjacent connecting conductors 140 transmit current in the same direction, and the structure of the frame 130 is as follows: Figure 1 As shown, the material of the frame 130 is stainless steel, and the connecting conductor 140 is a copper busbar. Figure 5 and Figure 7 The steepness of the current slope (i.e., frequency slope) is different, and the loss is different. Figure 5 As shown in Figure 2, through finite element simulation, the loss of each component is calculated as follows Figure 6 At the same frequency, the current curve with low current slope is as follows: Figure 7 The corresponding loss curve is shown as Figure 8 As shown. It can be seen that by reducing the frequency slope, the relative fluctuation of the corresponding loss current waveform can be reduced, greatly reducing the corresponding loss.

[0073] Please continue to refer to the attached Fig. 9 The current is as follows: Figure 5 As shown, the two connecting conductors 140 transmit current in opposite directions, and the loss is obtained through finite element simulation as shown in Fig. 9 , relative to Figure 6 The transmission current loss in the same direction is shown. By comparison, it can be seen that the steel frame loss is significantly reduced by the design of the opposite current path.

[0074] In a second aspect, an embodiment of the present application further provides a power supply system, comprising the above energy storage device.

[0075] In the technical solution of the embodiment of the present application, the power module 120 of the power supply system and the electric cabinet 110 are connected through the connecting conductor 140. Based on the principle that the same-direction current of adjacent connecting conductors 140 increases the induced magnetic field strength, and the opposite-direction current weakens the induced magnetic field strength, the adjacent connecting conductors 140 are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength, reducing the eddy current loss, thereby reducing the system temperature and facilitating heat dissipation.

[0076] In a third aspect, an embodiment of the present application further provides an electronic device, comprising the energy storage device as described above.

[0077] In this embodiment, the electronic device may be a power supply device, which is composed of a plurality of energy storage devices, and the plurality of energy storage devices may be centrally arranged in the same cabin. By designing the adjacent connecting conductors 140 to be currents in opposite directions, the induced magnetic field strength is weakened, the eddy current loss is reduced, and the system temperature is reduced, which is conducive to heat dissipation.

[0078] In the technical solution of the embodiment of the present application, the power module 120 of the electronic device is connected to the electric cabinet 110 through the connecting conductor 140. Based on the principle that the same-direction current of adjacent connecting conductors 140 increases the induced magnetic field strength, and the opposite-direction current weakens the induced magnetic field strength, the adjacent connecting conductors 140 are designed to have opposite-direction currents, thereby weakening the induced magnetic field strength, reducing the eddy current loss, thereby reducing the system temperature and facilitating heat dissipation.

[0079] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0080] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0081] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0082] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0083] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0084] The embodiments described above 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, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An energy storage device, characterized in that: The energy storage device comprises: At least one electrical cabinet, wherein a battery module is disposed in the electrical cabinet; At least one power module, each of which is connected to at least one of the electric cabinets and is used to control the input and output of the electric cabinet; at least one frame, used to fix the electric cabinet, and the electric cabinet is located inside the frame; and At least two connecting conductors, the connecting conductors are used to connect the power module and the electrical cabinet; The currents in the two adjacent and side-by-side connecting conductors are in opposite directions.

2. The energy storage device according to claim 1, characterized in that The two connecting conductors include: A first connecting conductor, connecting the positive electrode of the power module with the positive electrode of the electric cabinet; and The second connecting conductor connects the negative electrode of the power module and the negative electrode of the electric cabinet.

3. The energy storage device according to claim 1 or 2, characterized in that: The two connecting conductors arranged adjacently and side by side are connected to one power module and at least one electrical cabinet.

4. The energy storage device according to claim 1 or 2, characterized in that: The two adjacent connecting conductors arranged side by side are arranged parallel to each other.

5. The energy storage device according to claim 1, characterized in that: The connecting conductor is fixed to the frame in an electrically isolated manner and is located on the outside or inside of the frame.

6. The energy storage device according to claim 1, characterized in that: The connecting conductor includes a metal bus or a cable.

7. The energy storage device according to claim 1, characterized in that: It also includes a control module, which is connected to the power module. The control module is used to output a preset drive signal. The power module controls the input and output of the electric cabinet under the control of the preset drive signal, and the execution frequency is below 100 Hz.

8. The energy storage device according to claim 7, characterized in that: The slope of the execution frequency is below 2000 amperes / milliseconds.

9. The energy storage device according to claim 1, 7 or 8, characterized in that: The power module includes a first switch element and an energy storage element connected in parallel to the first switch element, and the energy storage element is connected in parallel to the electric cabinet.

10. The energy storage device according to claim 1, 7 or 8, characterized in that: The power module includes a half-bridge circuit or a full-bridge circuit.

11. The energy storage device according to claim 1, 7 or 8, characterized in that: The relative magnetic permeability of the material used to build the frame is below 2000.

12. A power supply system, characterized in that: Comprising the energy storage device as described in any one of claims 1-11.

13. An electronic device, characterized in that: Comprising the energy storage device as described in any one of claims 1-11.

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