System for energy storage unidirectional series connection, energy storage device and electric equipment

Abstract

The utility model discloses a system for energy storage unidirectional series connection, an energy storage device and electric equipment, and belongs to the technical field of energy storage equipment, the system comprises a box body with a plurality of stacked placing layers, a battery pack accommodated in each placing layer, and a series connection mechanism, the battery pack comprises a plurality of battery modules, and the series connection mechanism is arranged in the box body. Positive electrode interfaces and negative electrode interfaces of the battery modules are respectively arranged along the stacking direction; the series connection mechanism comprises a connecting piece and a double-core connector, the double-core connector comprises sockets and plugs, the sockets are arranged on the positive electrode interface and the negative electrode interface respectively, the plugs are connected with the two ends of the connecting piece respectively, and the sockets are provided with limiting grooves; the plug is connected with the socket in an inserted mode, the plug is provided with a limiting part matched with the limiting groove, and the limiting part directly faces the limiting groove. According to the utility model, the technical effects of improving the installation convenience and being beneficial to improving the safety are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy storage equipment, and in particular relates to a system for unidirectional series energy storage, an energy storage device and electrical equipment. Background Art

[0002] An energy storage system is a system used to store energy and release it when needed. The energy storage system achieves energy conversion and storage through different media and methods. In the existing energy storage system connection method, a single-core connector is usually used to connect the positive and negative poles in series. When using a single-core connector in the series installation process, multiple connectors need to be connected one by one, and after the series connection, they need to be installed back in series in the last battery box. This not only increases the number of installation connections, but also makes the entire installation process more cumbersome. Due to the complex installation steps, installers are prone to short circuits and wrong connections during the installation process, which poses a high safety hazard and risk. In addition, a large number of external wiring harnesses are exposed, which not only makes the overall wiring harness messy and disorganized, but also affects the aesthetics and neatness of the equipment.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the installation and connection are complicated and the potential safety hazard is high.

[0005] In order to solve the above technical problems, the present invention provides a system for unidirectional series connection of energy storage, the system comprising: a box having a plurality of stacked placement layers, a battery pack accommodated in each of the placement layers, and a series connection mechanism, the battery pack comprising a plurality of battery modules, the positive electrode interfaces and the negative electrode interfaces of the battery modules being arranged along the stacking direction respectively; the series connection mechanism comprising a connector and a dual-core connector, the dual-core connector comprising sockets respectively arranged at the positive electrode interface and the negative electrode interface, and plugs respectively connected to the two ends of the connector, the socket being provided with a limiting slot; the The plug is plugged into the socket, and the plug is provided with a limiting portion matching the limiting groove, and the limiting portion is opposite to the limiting groove; wherein, in the two adjacent battery modules of the battery pack, the socket provided at the positive electrode interface of one battery module is connected in series with the negative electrode interface of the other battery module through the plug and the connector; in the stacking direction, in the two corresponding battery modules above and below, the socket provided at the negative electrode interface of one battery module is connected in series with the positive electrode interface of the other battery module through the plug and the connector, so that multiple battery modules are connected in series.

[0006] Optionally, the limiting groove is tapered in the direction close to the first power connection end of the socket; the limiting portion is tapered in the direction close to the second power connection end of the plug; and the projection of the limiting portion in the limiting groove along the plugging direction is located in the limiting groove.

[0007] Optionally, the socket further includes: a limiting section and a bending section connected to the limiting section, the bending section is symmetrically distributed relative to a straight line perpendicular to the limiting section and located at the center of the limiting section, and the limiting section and the bending section enclose the limiting groove.

[0008] Optionally, the bending section includes: a first bending section connected to the limiting section, and a second bending section connected to the first bending section, the second bending section protrudes in a direction away from the limiting groove, and the second bending section is arc-shaped.

[0009] Optionally, the socket further comprises: a plurality of pins are arranged in the limiting groove, and a socket matching the pins is arranged in the limiting portion, and the pins are inserted into the socket.

[0010] Optionally, when viewed along the stacking direction, in the two corresponding battery modules above and below, the positive electrode interface and the negative electrode interface of one battery module and the positive electrode interface and the negative electrode interface of the other battery module are located on the same side of the battery module.

[0011] Optionally, the socket end of the socket provided at the positive electrode interface of the battery module is opposite to the socket end of the socket provided at the positive electrode interface of the battery module.

[0012] Optionally, the system further includes: a layer plate provided between two adjacent placement layers, the layer plate being used to support the battery module.

[0013] According to another aspect of the present invention, the present invention also provides an energy storage device, which includes the system for unidirectional series energy storage, and also includes: an external circuit, which is connected to the positive electrode interface or the negative electrode interface of one of the battery modules.

[0014] According to another aspect of the present invention, the present invention further provides an electrical device, which includes the system for unidirectional series connection of energy storage, or includes the energy storage device.

[0015] Beneficial effects:

[0016] The utility model provides a system for unidirectional series connection of energy storage, which has multiple stacking layers in a box body, and each storage layer contains a battery pack, which includes multiple battery modules, and the positive and negative interfaces of the battery modules are arranged along the stacking direction. Sockets of a dual-core connector in a series mechanism are respectively provided at the positive interface and the negative interface of the battery module, and the sockets are provided with limiting grooves. The plug of the dual-core connector is respectively connected to the two ends of the connector, and the plug and the socket are plugged into each other. The plug is provided with a limiting part that matches the limiting groove, and the limiting part is opposite to the limiting groove. In two adjacent battery modules of the battery pack, the socket provided at the positive interface of one battery module is connected in series with the negative interface of the other battery module through the plug and the connector; in the stacking direction, in two corresponding battery modules above and below, the socket provided at the negative interface of one battery module is connected in series with the positive interface of the other battery module through the plug and the connector, so that multiple battery modules are connected in series. This approach replaces multiple traditional single-core connectors with dual-core connectors. The dual-core connector integrates positive and negative wiring, achieving an integrated connection for both positive and negative poles. This directly reduces the number of connectors and installation steps, simplifying the installation process and reducing visual fatigue and error rates. At the same time, the socket's retaining groove matches the plug's retaining portion, providing a foolproof feature during frequent plug-in and plug-out procedures. This effectively avoids safety issues like short circuits caused by improper operation and enhances the overall safety of the system. This improves installation convenience and contributes to improved safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of a system for unidirectional series energy storage provided in an embodiment of the present invention.

[0019] Figure 2 A schematic diagram of a socket structure in a system for energy storage in a one-way series connection according to an embodiment of the present invention

[0020] Figure 3 This is a structural diagram of a plug in a one-way series energy storage system provided by an embodiment of the present invention.

[0021] Figure 4 A circuit diagram of a system for unidirectional series energy storage provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0023] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0024] In the embodiments of this application, "at least one" refers to one or more; "a plurality" refers to two or more. In the description of this application, the terms "first," "second," "third," etc. are used only for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0025] References to "one embodiment" or "some embodiments" described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, in this specification, the terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0026] It should be pointed out that, in the embodiment of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. At the same time, "connection" in the embodiment of the present application can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, A and B are connected, which can be either A and B directly connected, or A and B indirectly connected through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiment of the present invention are for illustrative purposes only and are not intended to limit the present invention.

[0027] The utility model provides a system for energy storage in one-way series connection. Figures 1 to 4 As shown, Figure 1 This is a structural diagram of a system for unidirectional series energy storage provided by an embodiment of the present utility model. Figure 2 This is a schematic diagram of the structure of a socket 321 in a system for energy storage unidirectional series connection provided by an embodiment of the present utility model. Figure 3 This is a schematic diagram of the structure of a plug 322 in a system for one-way series connection of energy storage provided by an embodiment of the present invention. Figure 4This is a circuit diagram of a system for energy storage in one-way series connection provided by an embodiment of the present invention. A system for energy storage in one-way series connection provided by an embodiment of the present invention includes a housing 1, a battery pack 2 and a series connection mechanism. The housing 1 is provided with a plurality of placement layers 11 arranged in a stacked manner. A battery pack 2 is accommodated inside each placement layer 11. The battery pack 2 includes a plurality of battery modules 21. The positive electrode interface 211 and the negative electrode interface 212 of the battery module 21 are arranged along the stacking direction. The series connection mechanism includes a connector 31 and a dual-core connector. The dual-core connector includes a socket 321 and a plug 322. A socket 321 is provided at each of the positive electrode interface 211 and the negative electrode interface 212, and the socket 321 is provided with a limiting groove 3211. Plugs 322 are connected to both ends of the connector 31 respectively. The plug 322 and the socket 321 are plugged into each other. The plug 322 is provided with a limiting portion 3221 that matches the limiting groove 3211, and the limiting portion 3221 is directly opposite to the limiting groove 3211. Among them, in two adjacent battery modules 21 of the battery pack 2, the socket 321 provided on the positive electrode interface 211 of one battery module 21 is connected in series with the negative electrode interface 212 of the other battery module 21 via the plug 322 and the connector 31. Along the stacking direction, in two corresponding battery modules 21 above and below, the socket 321 provided on the negative electrode interface 212 of one battery module 21 is connected in series with the positive electrode interface 211 of the other battery module 21 via the plug 322 and the connector 31, so that multiple battery modules 21 are connected in series.

[0028] Among them, the connecting part 31 includes a wire, the plug 322 in the dual-core connector is connected to the wire, the socket 321 in the dual-core connector is connected to the positive electrode interface 211 or the negative electrode interface 212 of the battery module 21, and the socket 321 and the plug 322 are mutually engaged. For example, a plug 322 is connected to each other at both ends of the wire, and the plug 322 at one end of the wire is plugged into the socket 321 set at the positive electrode interface 211 of a battery module 21, and the plug 322 at the other end of the wire is plugged into the socket 321 set at the negative electrode interface 212 of another battery module 21, so that the positive electrode interface 211 of one battery module 21 and the negative electrode interface 212 of another battery module 21 are connected in series. Those skilled in the art will understand that, in a system for energy storage unidirectional series connection provided by an embodiment of the present invention, there is no specific restriction on the positive and negative electrode circuit structure integrated in the dual-core connector. It is only necessary to realize that the socket 321 of a dual-core connector is connected to the positive electrode interface 211 of a battery module 21, and a plug 322 is inserted into the socket 321. The wire connected to the plug 322 will be connected to the positive electrode interface 211 of the battery module 21. When the socket 321 of another dual-core connector is connected to the negative electrode interface 212 of another battery module 21, and the other plug 322 is inserted into the socket 321, the above-mentioned wire connected to the plug 322 will be connected to the negative electrode of the battery module 21. The interface 212 is connected, that is, the plugs 322 at both ends of the wire are limited by the limiting portion 3221 and the limiting groove 3211, so that the plugs 322 will be inserted into the corresponding sockets 321 according to the corresponding positions. The socket 321 connected to the negative interface 212 of the battery module 21 only allows the plug 322 with the negative pole connected to be plugged into the socket 321, and the socket 321 connected to the positive interface 211 of the battery module 21 only allows the plug 322 with the positive pole connected to be plugged into the socket 321, so as to realize the fool-proof function in the process of a large number of plug-in operations of the sockets 321 and the plugs 322, effectively avoid safety problems such as short circuits caused by improper operation, and improve the overall safety of the system.

[0029] In this embodiment, a plurality of stacked placement layers 11 are provided within the housing 1. Each placement layer 11 houses a battery pack 2, which includes a plurality of battery modules 21. The positive and negative electrode interfaces 211 and 212 of the battery modules 21 are arranged along the stacking direction. Receptacles 321 of a two-core connector in a series mechanism are provided at the positive and negative electrode interfaces 211 and 212 of the battery modules 21, respectively. The receptacles 321 are provided with limiting slots 3211. A plug 322 of the two-core connector is connected to both ends of the connector 31, and the plug 322 and the receptacle 321 are plugged into each other. The plug 322 is provided with a limiting portion 3221 that matches the limiting slot 3211, with the limiting portion 3221 facing the limiting slot 3211. In the two adjacent battery modules 21 of the battery pack 2, the socket 321 provided at the positive electrode interface 211 of one battery module 21 is connected in series with the negative electrode interface 212 of the other battery module 21 via the plug 322 and the connector 31; in the stacking direction, in the two corresponding battery modules 21 above and below, the socket 321 provided at the negative electrode interface 212 of one battery module 21 is connected in series with the positive electrode interface 211 of the other battery module 21 via the plug 322 and the connector 31, so that the multiple battery modules 21 are connected in series. In this way, a dual-core connector is used to replace multiple traditional single-core connectors. The dual-core connector integrates positive and negative electrode circuits to achieve an integrated connection of the positive and negative electrodes, which will directly reduce the number of connectors and installation steps, which is conducive to simplifying the installation process and reducing visual fatigue and error rate. At the same time, the retaining groove 3211 of the socket 321 matches the retaining portion 3221 of the plug 322, providing a foolproof function during a large number of plug-in connections between the socket 321 and the plug 322, effectively preventing safety issues such as short circuits caused by improper operation and improving the overall safety of the system. This achieves the technical effect of increasing installation convenience and improving safety.

[0030] As an embodiment, the limiting groove 3211 is tapered along the direction of the first power connection end 3212 close to the socket 321, and the limiting portion 3221 is tapered along the direction of the second power connection end 3222 close to the plug 322. The first power connection end 3212 and the second power connection end 3222 can refer to the positive and negative poles of the socket 321 respectively. For example, when a socket 321 is connected to the positive electrode interface 211 of the battery module 21, and a plug 322 is inserted into the socket 321 according to the corresponding position, the plug 322 will be connected to the positive electrode interface 211 of the socket 321. The positive electrode of the battery module 21 is connected to the positive electrode of the battery module 21, and when the other socket 321 is connected to the negative electrode interface 211 of the other battery module 21 and the other plug 322 is inserted into the socket 321 according to the corresponding position, the plug 322 will be connected to the negative electrode of the socket 321, and the projection of the limiting portion 3221 inside the limiting groove 3211 along the insertion direction is located inside the limiting groove 3211, so that during the insertion process, the limiting portion 3221 can slide smoothly into the limiting groove 3211, and after it is fully inserted, the tapered structure provides a stable locking force to prevent the plug 322 from accidentally falling off. In addition, the projection of the limiting portion 3221 inside the limiting groove 3211 along the insertion direction is completely located inside the limiting groove 3211, which also ensures that the plug 322 is stably inserted into the socket 321 according to the preset direction.

[0031] In some embodiments, the socket 321 further includes a retaining section 3213 and a bent section 3214. The bent section 3214 is connected to the retaining section 3213 and is symmetrically arranged relative to a line perpendicular to the retaining section 3213 and located at the center of the retaining section 3213. The retaining section 3213 and the bent section 3214 enclose the retaining groove 3211, making the retaining groove 3211 of the socket 321 more structurally stable and more effectively preventing the plug 322 from shifting or shaking during the insertion process. This not only improves the accuracy and reliability of insertion, but also extends the service life of the socket 321 and the plug 322, helping to simplify the installation process and reduce the error rate.

[0032] In some embodiments, the bent section 3214 includes a first bent section 32141 and a second bent section 32142. The first bent section 32141 is connected to the limiting section 3213, and the second bent section 32142 is connected to the first bent section 32141. The second bent section 32142 protrudes in a direction away from the limiting groove 3211 and is arc-shaped. Due to manufacturing errors during the manufacturing process of the limiting portion 3221 and the limiting groove 3211, the provision of the arc-shaped second bent section 32142 ensures that the matching of the limiting portion 3221 and the limiting groove 3211 has a certain tolerance when the plug 322 and the socket 321 are plugged into each other, that is, the error within a certain range is allowed. Even if there is a certain deviation during the insertion of the plug 322 into the socket 321, it can still be smoothly inserted into the socket 321 and achieve a stable working state, thereby reducing malfunctions or failures caused by minor errors.

[0033] In some embodiments, the socket 321 further includes a plurality of pins 323 and a socket 324. The pins 323 are disposed within the retaining slot 3211, and the socket 324 mates with the pins 323, with the socket 324 being inserted into the socket 324. The socket 321 has a plurality of pins 323 disposed within the retaining slot 3211, while the retaining portion 3221 of the plug 322 is correspondingly provided with a socket 324 that mates with the pins 323. During the plug-in connection process, the pins 323 insert into the socket 324, forming an additional electrical connection and mechanical locking, thereby enhancing the connection stability between the plug 322 and the socket 321.

[0034] In some embodiments, when observed along the stacking direction, in the two corresponding battery modules 21 above and below, the positive electrode interface 211 and the negative electrode interface 212 of one battery module 21 and the positive electrode interface 211 and the negative electrode interface 212 of the other battery module 21 are located on the same side of the battery module 21, so that the operator can more easily identify the interface position and correctly perform the connection operation, which is conducive to reducing the error rate and improving installation efficiency.

[0035] In some embodiments, the socket end 3215 of the socket 321 of the positive terminal interface 211 of the battery module 21 is deviated from the socket end 3215 of the socket 321 of the positive terminal interface 211 of the battery module 21, so that the operator does not need to pay extra attention to the direction of the interface and only needs to assemble it according to the predetermined stacking order. This not only simplifies the installation process, but also reduces visual fatigue and error rate, and can also improve the stability and reliability of the entire system.

[0036] In some embodiments, the system for unidirectional series energy storage provided by the embodiments of the present invention further includes a layer plate, which is disposed between two adjacent placement layers 11 and is used to support the battery modules 21. Those skilled in the art will appreciate that the specific structure of the layer plate is not limited in the system for unidirectional series energy storage provided by the embodiments of the present invention; the layer plate only needs to be disposed between two adjacent placement layers 11 to support and secure the battery modules 21. The layer plate serves as a supporting structure between the battery modules 21, effectively distributing the weight and vibration load of the battery modules 21 and protecting the battery modules 21 from external shock and vibration.

[0037] In order to explain in detail an energy storage device provided by the present invention, the above embodiment 1 explains in detail a system for unidirectional series energy storage. Based on the same concept of the present invention, the present application also provides an energy storage device, as detailed in embodiment 2.

[0038] A second embodiment of the present invention provides an energy storage device, including a system for unidirectional series energy storage, and an external circuit 4 connected to the positive electrode interface 211 or the negative electrode interface 212 of a battery module 21.

[0039] Among them, the external circuit 4 includes an air switch, that is, after the above-mentioned multiple battery modules 21 form a series circuit with each other, the socket 321 on the positive interface 211 or the negative interface 212 of one of the battery modules 21 will be used to connect to the external circuit 4 to realize the input or output of electric energy, provide the energy storage device with an input and output channel for electric energy, and enable the energy storage device to be flexibly configured and expanded according to actual needs, thereby enhancing its compatibility and interoperability with other systems.

[0040] In order to provide a detailed description of an electrical device provided by the present invention, the above embodiment 1 provides a detailed description of a system for unidirectional series energy storage. Based on the same utility model concept, the present application also provides an electrical device, see embodiment 3 for details.

[0041] A third embodiment of the present invention provides an electrical device, which includes the system for unidirectional series connection of energy storage, or includes the energy storage device.

[0042] Electric devices can be any device or equipment requiring power, such as electric vehicles, household appliances, and industrial machinery. By integrating a one-way series energy storage system or device into these devices, both energy storage and energy supply can be achieved. This not only improves the independence and self-sufficiency of these devices, but also reduces their reliance on external power grids.

[0043] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A system for unidirectional series energy storage, characterized in that: The system includes: a box having multiple stacked placement layers, a battery pack accommodated in each of the placement layers, and a series connection mechanism, wherein the battery pack includes multiple battery modules, and the positive and negative electrode interfaces of the battery modules are arranged along the stacking direction respectively; the series connection mechanism includes a connector and a dual-core connector, the dual-core connector includes sockets respectively arranged at the positive and negative electrode interfaces, and plugs respectively connected to the two ends of the connector, the sockets are provided with limiting slots; the plugs are plugged into the sockets, and the plugs are provided with limiting portions matching the limiting slots, the limiting portions facing the limiting slots; wherein, in two adjacent battery modules of the battery pack, the socket provided at the positive electrode interface of one battery module is connected in series with the negative electrode interface of the other battery module through the plug and the connector; in the stacking direction, in two corresponding battery modules above and below, the socket provided at the negative electrode interface of one battery module is connected in series with the positive electrode interface of the other battery module through the plug and the connector, so that multiple battery modules are connected in series.

2. The system for unidirectional series energy storage according to claim 1, characterized in that: The limiting groove is tapered in the direction close to the first power connection end of the socket; the limiting portion is tapered in the direction close to the second power connection end of the plug; and the projection of the limiting portion in the limiting groove along the plugging direction is located in the limiting groove.

3. The system for one-way series connection of energy storage according to claim 1, characterized in that: The socket further includes: a limiting section and a bending section connected to the limiting section, the bending section is symmetrically distributed relative to a straight line perpendicular to the limiting section and located at the center of the limiting section, and the limiting section and the bending section enclose the limiting groove.

4. The system for one-way series connection of energy storage according to claim 3, characterized in that: The bending section includes: a first bending section connected to the limiting section, and a second bending section connected to the first bending section, the second bending section protrudes in a direction away from the limiting groove, and the second bending section is arc-shaped.

5. The system for one-way series connection of energy storage according to claim 1, characterized in that: The socket further comprises: a plurality of pins are arranged in the limiting groove, a socket matching the pins is arranged in the limiting portion, and the pins are inserted into the socket.

6. The system for one-way series connection of energy storage according to claim 1, characterized in that: When viewed along the stacking direction, in the two corresponding battery modules above and below, the positive electrode interface and the negative electrode interface of one battery module and the positive electrode interface and the negative electrode interface of the other battery module are located on the same side of the battery module.

7. The system for unidirectional series energy storage according to claim 1, characterized in that: The socket end of the socket provided at the positive electrode interface of the battery module is opposite to the socket end of the socket provided at the positive electrode interface of the battery module.

8. The system for one-way series connection of energy storage according to claim 1, characterized in that: The system further includes: a layer plate provided between two adjacent placement layers, wherein the layer plate is used to support the battery modules.

9. An energy storage device, characterized in that: The energy storage device includes the system for unidirectional series energy storage according to any one of claims 1 to 8, and further includes: an external circuit, wherein the external circuit is connected to the positive electrode interface or the negative electrode interface of one of the battery modules.

10. An electrical device, characterized in that: The electrical equipment includes the system for unidirectional series connection of energy storage according to any one of claims 1 to 8, or includes the energy storage device according to claim 9.

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